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Contents
1. 345 204 7 802 288 B2 9 2010 Sieetal 725 116 Continued FOREIGN PATENT DOCUMENTS JP 2002 196736 7 2002 JP 2003 348496 12 2003 Continued OTHER PUBLICATIONS Japanese Office Action dated Aug 31 2011 with partial English translation Continued Primary Examiner Georgia Y Epps Assistant Examiner Sultan Chowdhury 74 Attorney Agent or Firm McGinn IP Law Group PLLC 57 ABSTRACT A display apparatus is capable of displaying a distortion free projected image based on an image signal from a computer The display apparatus receives an image signal from the computer and projects an image depending on the image signal onto a projection surface The display apparatus includes a setting section which sets identification informa tion representative of an aspect ratio of a display of the com puter The identification information set in the setting section can be changed by the user 14 Claims 3 Drawing Sheets KEY INPUT SECTION PROJECTION SECTION EDID STORAGE US 8 459 805 B2 Page 2 U S PATENT DOCUMENTS FOREIGN PATENT DOCUMENTS JP 2004 102067 A 4 2004 7 884 836 B2 2 2011 Hussain 345 649 JP 2004 102067 A 4 2004 7 904 632 B2 3 2011 Sakasegawa 710 316 JP 2005 6311 A 1 2005 7 999 816 B2 8 2011 et al R 200510212965 Al 9 2005 Stone etal 22 23 esse Qu E n one e E E AITTE 2006 0017751 A1 1 2006 Shintani et al OTHER2. PUBLICATIONS 2006 0176397 8 2006 Panabaker 348 556 Japanese Office Action dated Jan 31 2012 with an English transla 2006 0238648 AL 10 2006 Wogsberg 348 441 tion 2007 0035707 Al 2 2007 Margulis 353 122 2007 0050294 3 2007 Trottier et al 705 50 cited by examiner U S Patent Jun 11 2013 Sheet 1 of 3 US 8 459 805 B2 FIG 1 US 8 459 805 B2 Sheet 2 of 3 Jun 11 2013 U S Patent 39VWOIS aida NOIIO3S NOILIOSCOWNd NOIILOUS L dNI XATA NOILOIS ONILISS GIGS NOIL23S Lnalno IndNI U S Patent Jun 11 2013 Sheet 3 of 3 US 8 459 805 B2 Fig 3 100 DETECT SIGNAL REQUESTING TRANSMISSION QF IMAGE SIGNAL 101 PROJECI SELECTION SCREEN ONTO PROJECTION SURFACE 102 INSTRUCT SWITCHER TO CHANGE CONNECTION 103 READ EDID 104 SET EDID 105 INSTRUCT SWITCHER TO CHANGE CONNECTION US 8 459 805 B2 1 DISPLAY APPARATUS BACKGROUND OF THE INVENTION 1 Field of the Invention The present invention relates to a display apparatus for projecting an image 2 Description of the Related Art Projectors receive an image signal from a personal com puter and project an image depending on the image signal onto a screen The image projected from the projector onto the screen generally has an aspect ratio of 4 3 The aspect ratio refers to the ratio of the horizontal size to vertical size of the image Some personal computers hereina
3. ID stored in EDID storage 2 The updating function is provided by a program stored in the memory of projector 1 for registering EDID in and deleting EDID from EDID storage 2 When the user makes a certain input action through key input section 6 controller 8 executes the program stored in the memory When the program is executed the user can register and delete EDID The PC connected to projector 1 is not limited to a PC capable of operating in a plug and play mode but may be a PC which does not have a plug and play function Even if the PC connected to projector 1 does not have a plug and play function projector 1 can project an image based on an image signal supplied from the PC at the same aspect ratio as the aspect ratio of the PC The present invention is applicable to other display devices than projectors typified by liquid crystal panels plasma dis play panels etc This application is based upon and claims the benefit of priority from Japanese Patent Application No 2007 193279 filed in Japan Patent Office on Jul 25 2007 the contents of which are hereby incorporated by reference While exemplary embodiments of the present invention have been described using specific terms such description is for illustrates purposes only and it is to be understood that changes and variations may be made without departing from the spirit or scope of the following claims 5 20 25 30 35 40 45 50 55 60 65 6
4. The invention claimed is 1 A display apparatus for receiving an image signal from a computer and projecting an image depending on the image signal onto a projection surface said display apparatus com prising a setting section which sets identification information rep resentative of an aspect ratio of a display of the com puter a storage which stores a plurality of identification informa tion representative of respective aspect ratios a controller which controls a setting of the identification information in said setting section an input output section connected to said computer a switcher which selectively changes a connection of said setting section to one of said controller and said input output section and a key input section which receives a signal input thereto wherein when said controller detects a signal input to said key input section for specifying one of said plurality of identification information stored in said storage said controller instructs said switcher to change the connec tion of said setting section from said input output section to the controller acquires the specified identification information from said storage newly sets the acquired specific identification information in said setting section through said switcher and thereafter instructs said switcher to change the connection of said setting section from the controller to said input output section wherein said switcher selectively changes betw
5. aid key input section for specifying one of said plurality of identification information stored in said storage said controller instructs said switcher to change the connec tion of said setting section from said input output section to the controller acquires the specified identification information from said storage newly sets the acquired specified identification information in said setting sec tion through said switcher and thereafter instructs said switcher to change the connection of said setting section from the controller to said input output section US 8 459 805 B2 7 wherein said switcher selectively changes between a first state in which a signal source is connected to a bus and a second state in which the signal source is separated from the bus and wherein the aspect ratio is identified based on the identifi cation information set in the setting section independent of the image signal from the computer 4 projector according to claim 3 wherein said controller selectively carries out a plug and play control mode and when said input output section is connected to the computer for reading the identification information set in said setting section in a plug and play session the identification informa tion set in said setting section is output to said computer 5 A display apparatus for projecting an image depending on an image signal said display apparatus comprising an input output section for receiving the ima
6. az United States Patent US008459805B2 10 Patent No US 8 459 805 B2 Nakagawa et al 45 Date of Patent Jun 11 2013 54 DISPLAY APPARATUS 56 References Cited 75 Inventors Tomohiro Nakagawa Tokyo JP U S PATENT DOCUMENTS Tsutomu Katou Tokyo JP 7 072 003 B2 7 2006 Stahl et al 349 5 7 106 383 B2 9 2006 Kahn 73 Assignee NEC Display Solutions Ltd Tokyo 7 131 730 B2 11 2006 Koide 353 20 JP Notice Subject to any disclaimer the term of this J y patent is extended or adjusted under 35 U S C 154 b by 505 days 21 Appl No 12 452 589 22 PCTFiled Jul 17 2008 86 PCT No PCT JP2008 063326 371 c 1 2 4 Date Jan 11 2010 87 PCT Pub No WO2009 014192 PCT Pub Date Jan 29 2009 65 Prior Publication Data US 2010 0128185 Al May 27 2010 30 Foreign Application Priority Data Jul 25 2007 2007 193279 51 Int CI G03B 21 00 2006 01 52 U S CI USPC ene 353 122 353 30 353 71 353 94 345 204 345 650 348 556 58 Field of Classification Search USPC 353 69 30 70 94 71 31 122 349 5 9 349 345 348 715 345 204 419 619 649 345 650 348 556 558 555 231 99 744 348 745 See application file for complete search history INPUT OUTPUT SECTION EDID SETTING SECTION 7 176 980 B2 2 2007 Stone et al 348 558 7 598 948 10 2009 Priem
7. ct ratio aspect ratio indicating signal to controller 8 When controller 8 receives the aspect ratio indicating sig nal from key input section 6 controller 8 instructs switcher 4 to change the connection of EDID setting section 3 from input output section 7 to controller 8 Controller 8 then reads the EDID which has the aspect ratio indicated by the aspect ratio indicating signal received from key input section 6 from EDID storage 2 and sets the read EDID in EDID setting unit 3 When the setting of the EDID is finished controller 8 instructs switcher 4 to change the connection of EDID setting section 3 from controller 8 to input output section 7 In this manner the EDID setting can be changed easily Controller 8 and input output section 7 are connected to each other by an ordinary route not shown separate from the bus Controller 8 receives an image signal supplied from wide PC 10 to input output section 7 through the ordinary route and sends the received image signal to projecting sec tion 5 Projecting section 5 displays an image based on the image signal sent from controller 8 20 25 30 35 40 45 50 55 60 65 4 FIG 3 is a flowchart of an operation sequence of projector 1 shown in FIG 2 Controller 8 receives a signal requesting the transmission of an image signal for a selection screen from key input section 6 step 100 and sends an image signal representative of a selection screen to projec
8. ct ratio of the image as 4 3 The projector projects the image at the identified aspect ratio onto the screen The projector disclosed in Patent Document 1 thus identi fies the aspect ratio based on the image signal However it is difficult for the projector to properly identify the aspect ratios of image signals which are similar to each other e g the aspect ratios of 15 9 16 9 and 16 10 Ifthe projector fails to identify the aspect ratio of an image then it cannot project the image at its own aspect ratio but projects an image that is not easily viewable SUMMARY OF THE INVENTION It is an exemplary purpose of the present invention to provide a display apparatus which will solve the above and other problems and which can project distortion free images To achieve the above and other purposes there is provided in accordance with the present invention a display apparatus for receiving an image signal from a computer and projecting an image depending on the image signal onto a projection surface comprising a setting section which sets identification information rep resentative of an aspect ratio of a display of the computer wherein the identification information set in the setting section is changeable by a user 20 25 30 35 40 45 50 55 60 65 2 The above and other purposes features and advantages of the present invention will become apparent from the follow ing description with reference to th
9. e accompanying drawings which illustrate examples of the present invention BRIEF DESCRIPTION OF THE DRAWINGS FIG 1 is a view showing an arrangement of an image projection system incorporating a projector according to an exemplary embodiment of the present invention FIG 2 is a block diagram of the projector shown in FIG 1 and FIG 3 is a flowchart of an operation sequence of the pro jector shown in FIG 2 DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENT An exemplary embodiment ofthe present invention will be described in detail below with reference to the drawings FIG 1 shows an arrangement of an image projection sys tem incorporating a projector according to an exemplary embodiment ofthe present invention As shown in FIG 1 the image projection system includes projector 1 and wide PC 10 Projector 1 stores a plurality of EDID Extended Display Identification Data representing different aspect ratios respectively The user of projector 1 sets EDID representing the aspect ratio ofthe display of a computer Wide PC 10 can be connected to projector 1 through con nection cable 9 When wide PC 10 is connected to projector 1 through connection cable 9 wide PC 10 acquires the EDID set in projector 1 Wide PC 10 outputs an image signal having an aspect ratio indicated by the acquired EDID to projector 1 When projec tor 1 receives the image signal from wide PC 10 projector 1 projects an image depending on the image signal on
10. e conversion table for a plurality of different aspect ratios If a display apparatus having an aspect ratio different from the aspect ratio of the display of the PC is connected to the PC then the PC refers to the image conversion table and performs an image conversion process to convert its image signal aspect ratio into the aspect ratio of the display appara tus In the present example since the PC and projector 1 have the same aspect ratio the PC does not perform the image conversion process and sends the image signal to projector 1 US 8 459 805 B2 5 In projector 1 input output section 7 receives the image signal from the PC and supplies the received image signal to controller 8 Controller 8 supplies the image signal from input output section 7 to projecting section 5 At this time controller 8 supplies the information about the aspect ratio corresponding to the EDID set in EDID setting section 3 together with the image signal to projecting section 5 Projecting section 5 comprises a video processing circuit a light source a liquid crystal panel for forming an image based onan image signal supplied from the video processing circuit an illuminating optical system for illuminating the liquid crystal panel with light rays from the light source and a projection lens for projecting an image formed by the liquid crystal panel The video processing circuit generates an image signal to be supplied to the liquid crystal panel based
11. een a first state in which a signal source is connected to a bus and a second state in which the signal source is separated from the bus and wherein the aspect ratio is identified based on the identifi cation information set in the setting section independent of the image signal from the computer 2 display apparatus according to claim 1 wherein said controller selectively carries out a plug and play control mode and when said input output section is connected to the computer for reading the identification information set in said setting section in a plug and play session the identification information set in said setting section is output to said com puter 3 A projector for receiving an image signal from a com puter and projecting an image depending on the image signal said projector comprising a setting section which sets identification information rep resentative of an aspect ratio of a display of the com puter a storage which stores a plurality of identification informa tion representative of respective aspect ratios a controller which controls a setting of the identification information in said setting section an input output section connected to said computer a switcher which selectively changes a connection of said setting section to one of said controller and said input output section and a key input section which receives a signal input thereto wherein when said controller detects a signal input to s
12. er having a function to read the EDID set in EDID setting section 3 in a plug and play session When input output section 7 is connected to wide PC 10 therefore the EDID set in EDID setting section 3 are supplied through input output section 7 to wide PC 10 Key input section 6 has buttons including a selection button not shown for displaying a screen for selecting an aspect ratio of an image When the selection button is pressed by the user key input section 6 supplies controller 8 with a selection screen display request signal for sending an image signal representing a selection screen In response to the selection screen display request signal controller 8 acquires data representative of the selection screen from a memory not shown generates an image signal representative of the selection screen based on the acquired data and sends the generated image signal to projecting sec tion 5 The selection screen includes contents items for the user to select an aspect ratio and is displayed on the projec tion screen by projecting section 5 For example the selection screen displays selection items indicative ofthe aspect ratios of 4 3 16 9 16 10 and 15 9 or others as appropriate After the selection screen is displayed when the user presses a decision button not shown of key input section 6 for indicating the aspect ratio of an image to be projected key input section 6 outputs a signal indicative of the aspe
13. erial data line SDA a serial clock line SCL 12 A display apparatus according to claim 11 wherein said bus comprises an Inter Integrated Circuit bus 13 A projector according to claim 3 wherein the bus employs a serial data line SDA and a serial clock line SCL 14 A display apparatus according to claim 5 wherein the bus employs a serial data line SDA and a serial clock line SCL
14. fter referred to as an ordinary have a display aspect ratio of 4 3 and others hereinafter referred to as wide PC have a display aspect ratio of 16 9 16 10 or 15 9 These computers employ image signals corresponding to the aspect ratios of their displays When a projector having an aspect ratio of 4 3 receives an image signal from an ordinary PC having a display aspect ratio of 4 3 the projector projects a distortion free image that is identical to the image displayed on the display screen ofthe ordinary PC However when a projector having an aspect ratio of 4 3 receives an image signal from a wide PC having a display aspect ratio of 16 9 the projector projects an image at the aspect ratio of 4 3 though the image should be displayed at the aspect ratio of 16 9 Therefore the image projected from the projector onto the screen is distorted i e it is compressed horizontally and expanded vertically and is not easily view able JP A No 2003 348496 hereinafter referred to as Patent Document 1 discloses a projector for making screen pro jected images easily viewable Specifically the projector dis closed in Patent Document 1 identifies the aspect ratio of an image frame based on the image signal sent from a PC If the image from the PC is a high definition image then the pro jector identifies the aspect ratio of the image as 16 9 If the image from the PC is an ordinary image then the projector identifies the aspe
15. ge signal from a computer means operatively coupled to said input output section for setting identification information representative of an aspect ratio of a display of the computer means for storing a plurality of identification information representative of respective aspect ratios means for controlling a setting of the identification infor mation in said means for setting means for selectively changing a connection of said means for setting to one of said means for controlling and said input output section and a key input section which receives a signal input thereto wherein when said means for controlling detects a signal input to said key input section for specifying one of said plurality of identification information stored in said means for storing said means for controlling instructs said means for selectively changing to change the con nection of said means for setting from said input output section to the means for controlling acquires the speci fied identification information from said means for stor ing newly sets the acquired specified identification information in said means for setting through said means for selectively changing and thereafter instructs said means for selectively changing to change the connection 20 25 30 35 8 of said means for setting from the means for controlling to said input output section wherein said means for selectively changing selectively changes between a firs
16. milar aspect ratios e g 15 9 16 9 16 10 etc The image displayed by the display apparatus is thus prevented from being distorted Operation of projector 1 in a specific example of usage of projector 1 will be described below Before a PC is connected to projector 1 the user checks the aspect ratio of the PC The user controls projector 1 to display a screen for selecting an aspect ratio and specifies on the displayed screen an item corresponding to the aspect ratio of the PC to be connected to projector 1 When the user has specified the aspect ratio controller 8 changes the connection of EDID setting section 3 from input output section 7 to controller 8 acquires the EDID which corresponds to the specified aspect ratio from EDID storage 2 and sets the acquired EDID in EDID setting unit 3 There after controller 8 instructs switcher 4 to change the connec tion of EDID setting section 3 from controller 8 to input output section 7 and controls projecting section 5 to display a message which shows that the EDID of the aspect ratio set by the user are properly set in the EDID setting section 3 on the projection surface After the message has been displayed the user connects the PC to projector 1 When the PC is connected to projector 1 the PC acquires the EDID set in EDID setting section 3 ina plug and play session Based on the EDID acquired from projector 1 the PC recognizes the aspect ratio of projector 1 The PC has an imag
17. ng to an instruction from controller 8 EDID setting section 3 is normally con nected to input output section 7 through switcher 4 US 8 459 805 B2 3 Projecting section 5 projects an image depending on an image signal from controller 8 onto the projection surface The projection surface may include a screen or a wall When controller 8 sends an image signal generated by wide PC 10 to projecting section 5 projection section 5 projects an image having an aspect ratio depending on the image signal onto the projection surface When wide PC 10 is connected to input output section 7 by connection cable 9 wide PC 10 operates in a plug and play manner Plug and play is a feature of wide PC 10 in which when projector 1 and wide PC 10 are connected to each other the OS Operating System of wide PC 10 automatically detects projector 1 and makes optimum settings without the users manual intervention Plug and play is based on requirement specifications defined by Microsoft registered trademark Corporation Interface standards of plug and play include USB Universal Serial Bus and IEEE 1394 Institute of Electrical and Electronic Engineers 1394 Control data are exchanged between wide PC 10 and projector 1 for plug and play according to these standards When input output section 7 is connected to wide PC 10 by connection cable 9 wide PC 10 acquires the EDID set in EDID setting section 3 in a plug and play session Wide PC 10 is a comput
18. on the image signal and the information about the aspect ratio supplied from controller 8 and the aspect ratio of an effective pixel area of the liquid crystal panel For example if the aspect ratio of the effective pixel area of the liquid crystal panel is 4 3 and the information about the aspect ratio sup plied from controller 8 represents 16 9 then the video pro cessing circuit generates an image signal having strip like black areas corresponding to blanking periods above and below the image based on the image signal supplied from controller 8 In this manner the image based on the image signal from controller 8 is projected onto the projection sur face at the aspect ratio corresponding to the EDID set in EDID setting section 3 The aspect ratio of the effective pixel area of the liquid crystal panel has been stored in the video process ing circuit According to the operation described above the user can freely set an aspect ratio within the range of EDID registered in projector 1 The user can set an aspect ratio for projector 1 depending on the aspect ratio of the PC Projector 1 can project an image based on an image signal supplied from the PC at the same aspect ratio as the aspect ratio of the PC Projector 1 described above is illustrated as only an example of the present invention and its structure and opera tion can be changed appropriately For example projector 1 may have a function for updating the information about the ED
19. t state in which a signal source is connected to a bus and a second state in which the signal source is separated from the bus and wherein the aspect ratio is identified based on the identifi cation information set in the means operatively coupled to said input output section independent of the image signal from the computer 6 A display apparatus according to claim 5 wherein said means for controlling selectively carries out a plug and play control mode and when said input output section is con nected to the computer for reading the identification informa tion set in said means for setting in a plug and play session the identification information set in said means for setting is output to said computer 7 A display apparatus according to claim 1 further com prising a projecting section which projects an image depending on the image signal from said computer at an identified aspect ratio based on said identification information set in said setting section 8 A display apparatus according to claim 1 wherein the bus employs a serial data line SDA and a serial clock line SCL 9 A display apparatus according to claim 1 wherein in the first state the signal source reads data 10 A display apparatus according to claim 1 wherein said bus comprises an I C Inter Integrated Circuit bus 11 A display apparatus according to claim 1 wherein said setting section is connected to said controller via the bus that employs a s
20. ting section 5 Projecting sec tion 5 projects the selection screen based on the image signal received from controller 8 onto the projection surface step 101 When controller 8 receives an aspect ratio indicating signal from key input section 6 controller 8 instructs switcher 4 to change the connection of EDID setting section 3 from input output section 7 to controller 8 step 102 Then controller 8 reads the EDID which has the aspect ratio indicated by the aspect ratio indicating signal received from key input section 6 from EDID storage 2 step 103 Controller 8 then sets the read EDID in EDID setting unit 3 step 104 Controller 8 instructs switcher 4 to change the connection of EDID setting section 3 from controller 8 to input output section 7 step 105 According to the present exemplary embodiment as described above in a display apparatus that is provided as projector 1 the EDID representative of the aspect ratio of the display of a computer as wide PC 10 are set as identification information and an image based on an image signal from the computer is projected at the aspect ratio indicated by the identification information Since the aspect ratio is not iden tified based on the image signal from the computer but iden tified based on the identification information set in the display apparatus the display apparatus can project a distortion free image based on the image signal which may be either one of image signals having si
21. to a projection surface Details of the arrangement of projector 1 will be described below with reference to FIG 2 Projector 1 includes EDID storage 2 EDID setting section 3 switcher 4 projecting section 5 key input section 6 input output section 7 and controller 8 Controller 8 is connected to projecting section 5 key input section 6 and EDID storage 2 EDID setting section 3 is selectively connected to input output section 7 and controller 8 by an Inter Integrated Circuit bus The bus employs two lines 1 e a serial data line SDA and a serial clock line SCL EDID storage 2 stores a plurality of EDID The EDID refer to data in a format according to VESA Video Electronics Standards Association including information about display types and display performances For example EDID storage 2 stores EDID representing an aspect ratio of 4 3 hereinafter referred to as 4 3 EDID EDID representing an aspect ratio of 16 9 hereinafter referred to as 16 9 EDID EDID represent ing an aspect ratio of 16 10 hereinafter referred to as 16 10 EDID and EDID representing an aspect ratio of 15 9 here inafter referred to as 15 9 EDID Initially EDID setting section 3 has the 4 3 EDID for example set therein as initial data Thereafter the user of projector 1 sets a desired one of the plural EDID stored in EDID storage 2 Switcher 4 connects EDID setting section 3 to either input output section 7 or controller 8 accordi
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