System and method for converting digital image signals
Contents
1. 0037 On the other hand the invention executes an over scan on the display device to prevent errors such as a cut off portion of a screen of the desired displayed image signal transmitted from an audio video player such as a DVD player or an unseen portion at some edges of the visible range of a TV screen when a lower resolution is used for displaying an image of a higher resolution or a general tele vision is used for displaying high resolution images The overscan captures a vertical blanking interval VBI portion wherein the basic principle of transmitting a television screen is to use the 1 to 22 lines of a plurality of scan lines of the television generally referred to as Vertical Blanking Interval to attach information to eliminate blanking noises in order to overcome the cut off portion and fill the images in a full screen 0038 The objective ofthe present invention is to correctly display an image signal transmitted from an audio video player of the HDMI specification or a signal converted from DVI to HDMI on a display device that supports the HDMI specification The invention can automatically execute an underscan or overscan processing measure after a determina tion takes place wherein auxiliary information carried in the signal ofa HDMI specification as shown in FIG 5 are param eters recorded in an information frame of auxiliary video information AVI The parameter S1 and S0 in the data bytel indicated by the2. 43 after a determination is made and the determination procedure is based on the aforementioned aux iliary video information AVI carried in the signal of the HDMI specification particularly based on parameters carried in an information frame of the auxiliary video information AVI The options of underscan 402 and overscan 403 are options selected manually by users through an operating key 410 ofa remote controller 41 so that when there is an error of processing the auto detection signal a corresponding image processing measure can be taken Further each of the fore going selected signal processing measures can be performed by operating a control panel on the display device 43 0036 The underscan and overscan processing measures are provided for solving the problem of using an audio video player of the HDMI specification or connecting a DVI to HDMI converter to a display device that supports the HDMI specification For example if a computer system connects to a display device that supports a HDMI specification by a digital interface such as DVI and the display device receives a HDMI signal then a portion of the transmitted screen dis play of the computer system may be cut off and thus users will be unable to see the whole computer screen To solve this problem the invention executes an underscan on the display device that supports the HDMI specification to solve the problem of white or black edges and display a complete screen
3. Sub is still the standard interface which is an analog signal transmission method required for cathode ray tube CRT monitors adopting a signal converter to convert digital signals of a display card in a computer system into analog signals before displaying the image sig nals During the signal conversion process the signals are attenuated and thus the digital visual interface DVI speci fication was developed and the DVI is a digital transmission method for generating signals from the display card directly by the digital transmission method and the display device can use the digital receiving method directly Therefore there will be no signal attenuation problem and the display quality can be enhanced greatly 0006 As to the high definition multimedia interface HDMI extensively used in the consuming market the digi tal output of a display card of a computer system can be a digital visual interface DVI output and the high definition multimedia interface HDMI can also be used as a display interface for connecting a display device or an LCD TV display device that supports the HDMI specification 0007 Referring to FIG 1 for a schematic view of a trans mitter for transmitting multimedia data in accordance with a prior art a signal converter 100 which is a high definition multimedia interface HDMI digital signal converter in this embodiment includes a HDMI transmitter 120 an encoder 40 and a data remapping unit 160 The HDMI
4. converting the image signal at the display device Step S909 In Case 2 as shown in Step S907 if the parameter S1 is 0 and the parameter S0 is 1 then it means that the received signal is an image signal coming from a com puter system wherein the signal is converted by a DVI to HDMI signal converter and an underscan is executed for converting the image signal at the display device Step S911 Apr 30 2009 0047 In another preferred embodiment users can select the signal processing measure for converting signals Further a previous using status can be stored in a memory so that the system no longer needs to select or detect the desired signal processing measure anymore 0048 Referring to FIG 10 fora flow chart of a method for converting digital image signals in accordance with a pre ferred embodiment of the present invention the converting system receives an external inputted image signal Step S101 and the timing of the signal is used for determining whether or not the image signal is an image signal of a computer system Step S103 ifyes which means that the image signal comes from a computer system and is generally converted from DVI to HDMI then execute an underscan of Step S111 and enter into an underscan display mode Step S113 if no which means that the signal is not from the computer system and it may be from another audio video player then the digital image signal converting system will display the input ou
5. digital image signals according to claim 12 wherein the auxiliary video informa tion AVI includes a data byte wherein the parameter of data byte shall be analyzed to determine the results which com prising the following conditions the image signal comes from an image playing device that supports a HDMI specification in which case executing the overscan procedure to the image signal and the image signal comes from an image playing device that supports a HDMI specification in which case executing the overscan procedure to the image signal 15 The method for converting digital image signals according to claim 12 wherein the select signal corresponds to a last used state recorded in memory 16 The method for converting digital image signals according to claim 12 wherein the input output mode options are displayed on the display device by an on screen display OSD technology 17 A digital image signal converting system comprising an image signal receiver for receiving an image signal a signal analyzer electrically coupled to the image signal receiver for analyzing an auxiliary video information AVI carried in a High Definition Multimedia Interface HDMI signal a timing detector electrically coupled to the image signal receiver for determining the source of the image signal when a timing is received US 2009 0109332 A1 an image signal processor electrically coupled to the sig nal analyzer and the timing detecto
6. displaying input output mode options on a display device receiving a select signal the select signal corresponds to the input output mode options executing a scan procedure based on the select signal and outputting the converted image signal 2 The method for converting digital image signals accord ing to claim 1 wherein the source ofthe image signal includes a playing device and a computer system that supports High Definition Multimedia Interface HDMI 3 The method for converting digital image signals accord ing to claim 1 wherein the select signal is generated by a control key on a remote controller 4 The method for converting digital image signals accord ing to claim 1 wherein the select signal indicates an auto detection option an overscan option or an underscan option 5 The method for converting digital image signals accord ing to claim 4 wherein when the select signal indicates the overscan option then executing the overscan procedure to convert the image signal 6 The method for converting digital image signals accord ing to claim 4 wherein when the select signal indicates the underscan option then executing the underscan procedure to convert the image signal 7 The method for converting digital image signals accord ing to claim 4 wherein when the select signal indicates the auto detection option analyzing the auxiliary video informa tion AVI carried by the image signal then determine whether to
7. signal is a signal transmitted from a computer system in a preferred embodiment Like the image display card the image timing of the computer system supports a resolution of 800 600 1024 768 1280 1024 or any other higher resolution The signal analyzer 72 and the timing detector 73 are electrically coupled to an image signal pro cessor 74 and the image signal processor 74 is provided for receiving a parameter such as S1 and S0 analyzed by the signal analyzer 72 or a signal source determined by the timing detector 73 so as to determine a signal processing measure such as an underscan and an overscan 0043 The invention further provides users a way of manu ally selecting a signal processing measure wherein the image signal processor 74 is electrically coupled to a select signal processor 75 andan option display unit 76 The option display unit 76 displays the options of different processing measures on a display device through a graphic display interface not shown in the figure and the image processing options include an auto detection an underscan and an overscan An US 2009 0109332 A1 input of a user s selection is received to generate a select signal for determining the user s desired signal processing measure and the image signal processor 74 executes the selected scan measure Ifthe select signal responds to an auto detection option then the image signal processor 74 will determine a processing measure according to the para
8. transmitter 120 can output digital data of the HDMI specification which is generally a digital audio video signal encoded by the encoder 140 and the encoded signal 1s converted into a digital signal of the DVI specification by the data remapping unit 160 and received by a DVI transmitter 180 at another end and then the digital data of the DVI specification is sent out On the other hand the DVI digital signal is received encoded mapped and converted into a HDMI digital signal 0008 From the aforementioned method of converting a DVI digital signal into a HDMI digital signal by a converter the signal is displayed by a display device of the HDMI specification For example the screen of a computer system is converted and displayed on a display device that supports the HDMI specification or a signal is converted by a HDMI to DV converter Signals of different specifications go through Apr 30 2009 the encoding and mapping processes to convert signals in different specifications by the converter as shown in FIG 1 0009 An embodiment of the related technology of trans mitting and receive multimedia information are disclosed in U S Pat Publication No 20070050807 a flow chart of the method and procedure of converting DVI signals into HDMI signals is shown in FIG 2 0010 This embodiment shows an 8 byte DVI signal to be converted into a 4 byte HDMI signal and adopts a 10 byte transition minimized differential signaling error reduc
9. IMENTS 0028 The present invention is described in details by pre ferred embodiments together with attached drawings as fol lows 0029 Inthe prior art display interfaces of different speci fications can be converted for displaying signals through an underscan procedure or an overscan procedure wherein Apr 30 2009 underscan procedure reduces the size of displaying signals and overscan procedure increases the size of the displaying signals so that the signals maybe be properly displayed how ever the conversion between the displayed signals may have encoding decoding errors In view of the shortcomings of the prior art the present invention provides a system and a method for converting digital image signals In addition to the automatic determination and processing for converting sig nals the invention also allows users to manually select a processing measure to avoid errors caused by wrong display information 0030 Referring to FIG 3 for a preferred embodiment of the invention applied to a computer system and a display device a display card of the computer system 33 comes with a digital output capability and uses the DVI as an image signal output interface With the DVI HDMI conversion a HDMI signal is generated and displayed on a display device 31 that supports the HDMI specification In this embodiment a dis play device 31 such as a television screen that supports a general HDMI interface signal is used as a computer
10. US 20090109332A1 as United States a2 Patent Application Publication 10 Pub No US 2009 0109332 A1 Lin 43 Pub Date Apr 30 2009 54 SYSTEM AND METHOD FOR CONVERTING Publication Classification DIGITAL IMAGE SIGNALS 51 Int CI H04N 7 01 2006 01 76 Inventor Yen Liang Lin Taipei City TW 52 US CL ete 348 441 348 E07 003 57 ABSTRACT Correspondence Address A system and a method for converting digital image signals ROSENBERG KLEIN amp LEE are disclosed The present invention is used for converting the 3458 ELLICOTT CENTER DRIVE SUITE 101 image signals between different digital interfaces The pre ELLICOTT CITY MD 21043 US ferred embodiment of the invention has a first step of receiv ing the image signals and a step of determining the signal format and source based on the detected timing afterwards Q1 Appl No 12 081 332 The method further goes to display several selective items on a display device in which a user can select one of the opera 22 Filed Apr 15 2008 tions Next a scan procedure is processed The selective items 15 include automatic detection underscan and overscan Conse quently a specific signal operation operates in response to the 30 Foreign Application Priority Data parameters recorded in the AVI info frame carried by the HDMI image signals So as to solve the error display as the Oct 29 2007 CTW eene un 96140562 signals convert HDMI oana Q Ao Paten
11. arrowhead represent the source of an image signal of the computer system or a signal of an audio video player such as a TV signal In addition to the auto detection processing measure a way of manually selecting the process ing measure is taken into consideration in case of having Apr 30 2009 wrong transmitted data and preventing wrong displays caused by wrong scan information Such arrangement is a preventive mechanism taken at the display device 0039 Referring to FIG 6 for the relation between two bytes of parameters S1 S0 in the data byte 1 and scan infor mation ifthe parameter S1 is 0 and the parameter S0 is 0 then it means that no image data is generated if the parameter S1 is 0 and the parameter S0 is 1 then it means that the image signal is transmitted from a computer system and the under scan measure will be taken if the parameter S1 is 1 and the parameter S0 is 0 then it means that the image signal is a general image signal and the overscan measure will be taken and if the parameter S1 is 1 and the parameter S0 is 1 then it means no processing measure is defined 0040 The present invention uses a digital image signal converting system to execute the input output of different image signals wherein the system also has the functions such as timing detection user option input and scan processing Refer to FIG 7 forthe schematic functional block diagram of the digital image signal converting system in accordan
12. ce with the present invention 0041 In the figure a digital image signal converting sys tem 7 comprises an image signal receiver 71 a signal analyzer 72 a timing detector 73 an image signal processor 74 a select signal processor 75 an option display unit 76 and an image signal output unit 77 The system 7 receives an input of external image signals including an image signal of a com puter system a signal of a general audio video player or any other signal such as a signal inputted from the source of a set top box a TV game player a digital stereo and a televi sion The signals are received by an image signal receiver 71 and these signals include the signals inputted through a high definition multimedia interface or the signals converted from other signals into the high definition multimedia interface HDMI specification 0042 The image signal receiver 71 is electrically coupled to the signal analyzer 72 and the timing detector 73 wherein the signal analyzer 72 can analyze auxiliary video informa tion AVI carried by the HDMI signal such as the parameter recorded in an information frame ofthe auxiliary video infor mation AVI as shown in FIG 5 particularly the parameters S1 and S0 ina data bytel and the values ofthe two parameters determine a processing measure required by the image signal The timing detector 73 determines the timing of the received signal and the timing is used for determining whether or not the image
13. display mode if the image signal the com puter system s image signal displaying input output mode options on a display device if the image signal is not the computer system s image signal wherein the options includes an auto detection option an underscan option and an overscan option receiving a select signal corresponding to each input out put mode options executing the underscan procedure to the image signal and entering into the underscan display mode if the select signal indicates the underscan option executing the overscan procedure to the image signal and entering into the overscan mode if the select signal indi cates the overscan option determining a processing measure executed by the image signal based on a parameter recorded in the information frame ofan auxiliary video information AVI carried by a High Definition Multimedia Interface HDMI signal if the select signal is the auto detection entering into the underscan display mode after the under scan is executed if the parameter indicates that the image signal should execute the underscan procedure and entering into the overscan display mode after the overscan procedure is executed if the parameter indicates that the image signal should execute the overscan procedure 13 The method for converting digital image signals according to claim 12 wherein the select signal is generated by a control key installed on a remote controller 14 The method for converting
14. en the underscan will be executed Step S111 and the underscan display mode will be entered Step S113 0053 5 For any condition other than the parameters S0 1 S1 0 which means the inputted image signal should execute an overscan Step S115 then the overscan display mode will be entered Step S117 0054 In summation of the description above the system and method for converting digital image signals disclosed by the invention provides users a way of selecting an image processing measure on a display screen for displaying an image signal coming from a HDMI source or an image signal converted into a HDMI signal by a computer system so as to solve the problems of having wrong displays caused by wrong scan information 0055 Although the present invention has been described with reference to the preferred embodiments thereof it will be understood that the invention is not limited to the details thereof Various substitutions and modifications have been suggested in the foregoing description and others will occur US 2009 0109332 A1 to those of ordinary skill in the art Therefore all such sub stitutions and modifications are intended to be embraced within the scope of the invention as defined in the appended claims What is claimed is 1 A method for converting digital image signals compris ing the steps of receiving an image signal determining a format and a source of the image signal based on a detected timing
15. erscan automatically the invention also provides a manual selecting method to prevent erroneous display caused by the wrong scan information In a preferred embodiment an automatic method or a user manual adjusting method is provided so that users can select or switch an option of executing a scan such as an underscan option an overscan option and an auto detection option of a HDMI video through a quick key or a hotkey of a display device controller 0013 Theinvention discloses a preferred embodiment ofa digital image signal converting system comprising an image signal receiver a signal analyzer a timing detector an image signal processor a select signal processor an option display unit and an image signal output unit The image signal receiver receives an input of external image signals including an image signal of a computer system and a signal of a general audio video player etc The signal analyzer can ana lyze the auxiliary video information carried in a HDMI sig nal The timing detector determines the timing ofthe received signals and then the image signal processor receives the parameters analyzed by the signal analyzer or the source of a signal determined by the timing detectorto determine a signal processing measure which can be an underscan or overscan signal processing measure 0014 The present invention further provides a signal pro cessing measure selected by users through a screen and a display unit for displaying t
16. execute the underscan procedure or the overscan procedure based on one or a plurality of parameters included in AVI 8 The method for converting digital image signals accord ing to claim 7 wherein the AVI is information carried by the HDMI signal 9 The method for converting digital image signals accord ing to claim 8 wherein the HDMI signal is a signal converted from DVI to HDMI 10 The method for converting digital image signals according to claim 7 wherein the auxiliary video information AVI includes a data byte wherein the parameter of data byte shall be analyzed to determine the results which comprising the following conditions the image signal comes from an image playing device that supports a HDMI specification in which case executing the overscan procedure to the image signal and the image signal comes from an image playing device ofa computer system in which case executing the underscan procedure to the image signal 11 The method for converting digital image signals according to claim 1 wherein the input output mode options are displayed on the display device by an on screen display OSD technology Apr 30 2009 12 A method for converting digital image signals com prising the steps of receiving an image signal determining whether or not the image signal is an image signal of a computer system based on the timing of the image signal executing an underscan procedure and entering into an underscan
17. gnals automatically the embodiment of the invention also allows users to manually select a signal processing method to prevent wrong displays caused by wrong scan information The invention aims at a preventive mechanism of the display device to solve the prob lem of connecting a HDMI or DVI to HDMI connector to the display device 0033 To produce a correct display and provide a flexible solution for users to select or switch a signal processing method the present invention discloses a system and a method for converting digital image signals and provides an automatic method or a user s manual adjusting method to select or switch an option of executing a signal scan by a quick key ora hot key ofa display device controller and the option includes an underscan an overscan or an auto detection of a HDMI video 0034 In FIG 4 users can generate a select signal by pressing an operating key 410 such as a direction key a quick key or a hotkey on a remote controller 41 After the display US 2009 0109332 A1 device 43 receives the select signal an option selection menu 40 is shown by an on screen display OSD technology and the option selection menu 40 includes image processing options such as an auto detection 401 an underscan 402 and anoverscan 403 provided for the users to select for the opera tion 0035 The auto detection 401 is an option of executing an underscan or overscan processing measure by a processor of a display device
18. he options of the processing mea US 2009 0109332 A1 sures The selected signal processing measure also includes auto detection If the analyzed information is wrong a user can manually select an underscan or an overscan and the image signal output unit will output a converted image signal through the aforementioned system 0015 The method for converting digital image signals disclosed by the present invention is applied in conversions of different digital interfaces and a preferred embodiment receives the image signals first and then determines the for mat and source of the signals based on the timing and dis plays an input output mode option on a display device and finally a user decides a processing measure to carry out a desired scan procedure according to the selected processing measure 0016 The aforementioned options include the options of auto detection underscan and overscan If the auto detection option is selected the system for converting digital image signals will execute the signal processing according to param eters recorded in an information frame of auxiliary video information AVI If there is wrong analyzed information then a user can manually select the underscan or overscan and finally the converted image signal will be outputted 0017 To make it easier for our examiner to understand the expected objectives technical measures and effects of the present invention we use preferred embodiments together w
19. ich comprising the following conditions the image signal comes from an image playing device that supports a HDMI specification in which case executing an overscan procedure to the image signal and the image signal comes from an image playing device of a computer system in which case executing an underscan procedure to the image signal 22 The digital image signal converting system according to claim 17 wherein the select signal is generated by a control key on a remote controller 23 The digital image signal converting system according to claim 17 wherein the processing measure is executed by the image signal processor and determined according to the select signal which comprises the steps of executing the underscan procedure to convert the image signal if the select signal is underscan executing the overscan procedure to convert the image signal if the select signal is overscan analyzing the AVI carried in the image signal if the select signal is of auto detection option and executing the underscan procedure or the overscan proce dure according to one or a plurality of parameters 24 The digital image signal converting system according to claim 17 wherein the select signal corresponds to a last used state recorded in a memory k k X X
20. ion Publication OT DI4 opou e dsrp ueosloAO opou e dsrp ueos1opun ATIS ue olur JIojug ue OjUI 191UJ ETIS UBISJJAO UB 91nooXj UeosJopun ue o3nooxg VIS Siojoueted oy UITUL191 0 S19U10 60IS SOTS uor do pow jndjno ue e dsiq o U91S S Jojnduoo e WOIf USIS gewr y SJ SO 6015 TOIS BUSTS geuwr ue AI99948 US 2009 0109332 A1 SYSTEM AND METHOD FOR CONVERTING DIGITAL IMAGE SIGNALS BACKGROUND OF THE INVENTION 0001 1 Field of the Invention 0002 The present invention relates to a system and a method for converting digital image signals and more par ticularly to the conversions applied in different digital inter faces that select a scan mode to solve the problem of having wrong displays when signals are converted 0003 2 Description of Related Art 0004 Signal transmissions can be divided into analog and digital transmissions and analog signals are gradually replaced by digital signals particularly for image display devices that require high definition display and resolution High definition multimedia interface HDMI becomes a trend of the consuming market and HDMI can simulta neously transmit audio and video signals through a same cable and its application covers the areas of set top box DVD player TV game player digital stereo and television etc 0005 Although present high end DVD players generally come with a HDMI port D
21. ith the attached drawings for the detailed description of the invention but it should be pointed out that the attached draw ings are provided for reference and description but not for limiting the present invention BRIEF DESCRIPTION OF THE DRAWINGS 0018 FIG 1 is a schematic view ofa transmitter for trans mitting multimedia data in accordance with a prior art 0019 FIG 2 isa flow chart of converting a DVI signal into a HDMI signal in accordance with a prior art 0020 FIG 3isaschematic view ofa computer system and a display device in accordance with the present invention 0021 FIG 4 is a schematic view of executing an option by a remote controller in accordance with the present invention 0022 FIG 5 shows an information frame of auxiliary video information AVI specification 0023 FIG 6 shows the relation between parameters S1 S0 and scan information in the data bytel 0024 FIG 7 is a functional block diagram of a system for converting digital image signals in accordance with the present invention 0025 FIG 8 is a flow chart of a method for converting digital image signals in accordance with the present inven tion 0026 FIG 9 is a flow chart ofa scan processing procedure in accordance with the present invention and 0027 FIG 10 is a flow chart of a method for converting digital image signals in accordance with a preferred embodi ment of the present invention DETAILED DESCRIPTION OF THE PREFERRED EMBOD
22. meter of the signal analyzer 72 0044 The image signal processor 74 is electrically coupled to an image signal output unit 77 and the image signal processor 74 integrates the information to determine the final signal processing measure and finally the image signal output unit 77 outputs the converted image signal by the system 7 0045 Referring to FIG 8 for a flow chart of a method for converting digital image signals in accordance with the present invention the method applies the options as shown in FIG 4 and users select their desired image processing mea sure through these options The procedure starts and receives an image signal Step S801 and then determines the format and the source of the image signal based on the detected timing that is the timing of the image signal Step S803 and a display device of a converting system as disclosed in a preferred embodiment of the invention displays an input output mode option Step S805 and a user determines a desired processing measure and the options include an auto detection option an underscan option and an overscan option and the user can select a control key including a control panel on a display device or a press key on a remote controller to generate a select signal and the system receives the select signal through a wireless such as Bluetooth wireless net work infrared or a cable communication measure In which the select signal corresponds to the input output m
23. ode options including the aforementioned auto detection option under scan option and overscan option Step S807 The scan pro cedure is executed according to the select signal and the scan procedure is illustrated in the flow chart as shown in FIG 9 Step S809 For instance the select signal includes an auto detection option an underscan option and an overscan option If the auto detection option is selected the digital image signal converting system will execute a signal processing measure according to the parameters recorded in the infor mation frame of the auxiliary video information AVI and finally output the converted image signal Step S811 0046 Inthe scan procedure executed in the Step S809 of the determination procedure as shown in FIG 9 if the select signal received by the Step S807 in FIG 8 is an auto detection option then the scan procedure in the Step S809 will analyze the auxiliary video information AVI carried by the inputted image signal Step S901 and determine the parameters Step 903 and a desired scanning measure is selected according to the parameters The parameter of data byte shall be ana lyzed to determine the results which include at least two conditions In condiction 1 as shown in Step S905 if the parameter S1 is 1 and the parameter S0 is 0 then it means that the received image signal comes from an image playing device that supports the HDMI specification and an overscan is executed for
24. r for receiving the message analyzed by the signal analyzer to determine a processing measure or for receiving the source of the image signal determined by the timing detector to deter mine a processing measure a select signal processor electrically coupled to the image signal processor for receiving a select signal an option display unit electrically coupled to the select signal processor for displaying options on a display device and an image signal output unit electrically coupled to the image signal processor for outputting the converted image signal 18 The digital image signal converting system according to claim 17 wherein the options on the display device includes an overscan option an overscan option and an underscan option 19 The digital image signal converting system according to claim 17 wherein the digital image signal includes a HDMI input signal or a signal of HDMI specification con verted from another image signal 20 The digital image signal converting system according to claim 17 wherein the signal analyzer is for analyzing one or a plurality of parameters recorded in an AVI s information frame 21 The digital image signal converting system according to claim 20 wherein the parameters are the plurality of parameters in a data byte which is used for determining the Apr 30 2009 processing measure of the image signal the parameters of data byte shall be analyzed to determine the results wh
25. screen A general computer system 33 comes with a traditional ana log interface specification such as a D sub or a DVI interface for digital signals The invention can avoid wrong informa tion displayed on the display device 31 caused during the conversion of DVI signals to HDMI signals Further the scope of application also supports a HDMI video device to convert signals that support a HDMI display device and pre vents conversion errors 0031 The wrong scan information produced by the afore mentioned conversion causes a wrong display on the display device For example different auxiliary information are defined in the specification of HDMI signals and these aux iliary information are included in the message transmitted from a source device of the image signals mainly from an auxiliary video information frame AVI Info Frame or pack aged into a HDMI signal transmitted from a DVD player ora DVI digital signal transmitted from a computer system and converted into a HDMI signal wherein a wrong format of the conversion is filled into the AVI info frame frequently and thus wrong information are displayed on the display device such as an LCD TV display device frequently which includes a portion of the screen being cut off from the display ofthe computer system and thus users cannot see a complete screen in order to operate the system correctly 0032 In addition to the execution of processing the gen eral underscan and overscan si
26. t Application Publication Apr 30 2009 Sheet 1 of 10 US 2009 0109332 A1 180 H O 4 S Y c e m 160 Data remapping unit FIG 1 PRIOR ART 100 140 transmitter 120 US 2009 0109332 A1 Apr 30 2009 Sheet 2 of 10 Patent Application Publication LUV dOldd 6 II BJEpP INCH D9pooep Sul A19594 L06S e1ep INCH 914q y e Out 9poo p WHL 9149 01 941 epooeq S0 S 9poo PAFL 9149 01 o3ur 919p AT 914q g UB 1J9AUO 06S UOIj92IIIOodS 9 O TJEDT TT TAG 94 J 1028 JO e ep rpeurj nu e AI9299 Patent Application Publication Apr 30 2009 Sheet 3 of 10 US 2009 0109332 A1 FIG 3 c 31 opna 0 Patent Application Publication Apr 30 2009 Sheet 4 of 10 US 2009 0109332 A1 FIG 4 lt OD elo alc ce O SIG Ociojoio O I Alv Fra OF BW amp O O O VO Ol gt oO O Glo oO 3 mn lt 401 402 403 US 2009 0109332 A1 Apr 30 2009 Sheet 5 of 10 Patent Application Publication G Old suq g Jeddn Jeg Jybrg JO VEIS JO JEGUINN xId EL eg eieg suq g Jamoj JEG 1051 JO HEIS JO Jequinw exid L eg ejeg silq g Jaddn Jeg 197 jo pu3 JO JequinN j9xid LL eg eieg Sig 8 j0 0J Jeg 497 jo pu3 JO 1equunw Xid Ol sg ereg suq g Jeddn Jeg woyog Jo URIS JO JequinwN eur 6 9g deg suq 8 JEMO Jeg tuollog Jo HEIS JO JequinN eur 9 eig Beg sud 9 Jeddn Jeg do jo pug JO JequunN auri 1 eig eieq syq 8 1e 0J Jeg do jo p
27. tion coding 4 TERC4 encoding decoding algorithm The multi media data of the DVI specification is received Step S201 such as a computer system having a DVI receiver receives a multimedia data generated by the system and then a proces sor of the system converts an 8 byte data of the DVI specifi cation into a 10 byte TERC4 code Step S203 and the decoder decodes the TERC4 code into a 4 byte data of the HDMI specification Step S205 and finally the decoded HDMI data is received Step S207 If the aforementioned embodiment is applied to a prior art the computer system will generate a DVI signal which is converted into display infor mation of the HDMI specification and the display informa tion is received by the display device to complete the conver sion of image signals SUMMARY OF THE INVENTION 0011 Inthepriorart an AVI info frame is frequently filled with a wrong format of a HDMI signal transmitted from a consumer electronic device such as a DVD player or a DVI digital signal converted into a HDMI signal and transmitted from a computer system and thus a display device such as an LCD TV display device will display a screen according to the wrong information 0012 To produce an accurate display and provide users the flexibility of selecting a conversion method the invention discloses a system and a method for converting digital image signals In addition to the signal processing of executing a general underscan or ov
28. tput mode options on the display device such as on a display device by an on screen display OSD technology Step S105 such that users can select the option from a control panel ofa display device ora press key on a remote controller and the system receives the select signal Step S107 and each select signal corresponds to an option of the signal processing measure including a specified auto detection underscan or overscan as follows 0049 1 Select an underscan option Step S111 to execute an undercan to an inputted screen signal and then enter into an underscan display mode Step S113 0050 2 Select an overscan option Step S115 to elimi nate the masked portion of a cut off portion of a vertical blanking interval VBI and then enter into an overscan dis play mode Step S117 0051 3 Select an auto option to drive the digital image signal converting system to execute an auto detection and determine a processing measure required for executing an image source according to parameters recorded by an infor mation frame in the auxiliary video information AVI carried by the HDMI signal so that the timing aspect ratio or scan information of the image signal can be found and the pre ferred embodiment references the parameters S1 and S0 in a data bytel Step S109 and the following conditions are included 0052 4 Ifthe parameters S0 1 S1 0 which means that the inputted image signal should execute an underscan th
29. ug JO jequunw eur 9 eig eq 0 3q ieys 9njn4 10 pewiesen S eg eieg 0 eq RUS etin JO PEMSSEN y eg eq 0 99 eys eunjnj 10 peresey eig aeq log is op ig ov o sz Q PASY eg veq 1 eure130ju Av Jo UI UST euieJojul JAY JO UI UST pe ose ET 79 d euiej4oJul apo ed awiesjojuy uoneorjioeds oweay AV uoneuuojur odeur Arerixny US 2009 0109332 A1 Apr 30 2009 Sheet 6 of 10 Patent Application Publication jeu BIS IInd ueosIopu US 2009 0109332 A1 Apr 30 2009 Sheet 7 of 10 Patent Application Publication 9L jndu uordg GL L l jnding euSrg osSeu jrun jndjno peusis ose Ta jrun e dsrp uorjdo JOSS9201d BUSIS 1299S JOSS3200Id eusSrs geuj J03293ep SUIT 1ez eue Jeusi J9ATIOII eusis o8eu pel Indu eusSrg ose LL PL L TL US 2009 0109332 A1 Apr 30 2009 Sheet 8 of 10 Patent Application Publication 8 DI BUSTS gewr pojJaAUOd y jndjng 9Jnpoooud UBIS B ojnooxq 8UF IS 199 9S JATI uorjdo epou 3ndjno ue e dsiq eudrs 94 JO 32INOS pue jeuJor y euru ojeq eUZIS ogeUI ue 2A1909Y IT8S 608S LO8S G08S 6085 1085 US 2009 0109332 A1 Apr 30 2009 Sheet 9 of 10 Patent Application Publication IT6S L06S U82S I9AO UB 931nooxT 6 Old UBOS I9pur UE 91NJ29X Y US 2009 0109332 A1 Apr 30 2009 Sheet 10 of 10 Patent Applicat
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