ANSI CTA-2038-2012 Command-Driven Analog IR-Synchronized Active Eyewear (Formerly ANSI CEA-2038).pdf

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1、 ANSI/CTA Standard Command-Driven Analog IR-Synchronized Active Eyewear ANSI/CTA-2038 R-2017 (Formerly ANSI/CEA-2038) November 2012 NOTICE Consumer Technology Association (CTA) Standards, Bulletins and other technical publications are designed to serve the public interest through eliminating misunde

2、rstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards, Bulletins and other technical publications

3、shall not in any respect preclude any member or nonmember of the Consumer Technology Association from manufacturing or selling products not conforming to such Standards, Bulletins or other technical publications, nor shall the existence of such Standards, Bulletins and other technical publications p

4、reclude their voluntary use by those other than Consumer Technology Association members, whether the standard is to be used either domestically or internationally. Standards, Bulletins and other technical publications are adopted by the Consumer Technology Association in accordance with the American

5、 National Standards Institute (ANSI) patent policy. By such action, the Consumer Technology Association does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting the Standard, Bulletin or other technical publication. This document does not purp

6、ort to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this document to establish appropriate safety and health practices and to determine the applicability of regulatory limitations before its use. This document

7、is copyrighted by the Consumer Technology Association (CTA) and may not be reproduced, in whole or part, without written permission. Federal copyright law prohibits unauthorized reproduction of this document by any means. Organizations may obtain permission to reproduce a limited number of copies by

8、 entering into a license agreement. Requests to reproduce text, data, charts, figures or other material should be made to the Consumer Technology Association (CTA). (Formulated under the cognizance of the CTA R4 Video Systems Committee.) Published by CONSUMER TECHNOLOGY ASSOCIATION 2017 Technology A

9、fter1 (“A1”), Before1 (“B1”), After2 (“A2”), and Before2 (“B2”). The command sequence (order and repetition of commands) per image cycle define the mode of operation. The mode of operation specified by the command sequence communicates information like Dual View versus 3D to the eyewear. The number

10、of images per image cycle is specific to the mode of operation. The 3D Image Pairs shall come Left (odd image number) then Right (even image number) together in the Image Cycle. The operation modes defined for the command set is summarized in the following table, a more detailed description of these

11、 modes can be found in Annex A of this document. Table 1: Operating Mode Summary Mode Number Mode Name EyewearSupport Description 1 Shutdown Required Both Shutters open 2 & 3 Symmetrical Single 3D RequiredSingle 3D image sent as 1stimage to Left eye and 2ndimage to Right eye. Variable shutter close

12、timing. 4 Swap Single 3D RequiredSingle 3D image sent as 1stimage to Left eye and 2ndimage to Right eye. Both shutters are never closed simultaneously. 5 & 6 Symmetrical Dual 2D3Optional4Individual images are sent to the Left & Right eye. Variable shutter close timing. 7 Swap Dual 2D3Optional4Indivi

13、dual images are sent to the Left & Right eye. Both shutters are never closed simultaneously. 8 & 9 Single 2D Optional4Image is sent to the Left & Right eye simultaneously. Variable shutter close timing. 10 Half Single 2D Optional4Image is sent to the Left & Right eye simultaneously. Shutters are ope

14、n 50% of the time. 11 & 12 Symmetrical Dual 3D2Optional4Two 3D images are sent as images 1&3 to the Left eye and images 2&4 to the Right eye Variable shutter close timing. 13 Swap Dual 3D Optional4Two 3D images are sent as images 1&3 to the Left eye and images 2&4 to the Right eye. Both shutters are

15、 never closed simultaneously. 14 & 15 Symmetrical Quad 2D Optional4One of four individual images is sent to the Left & Right eye. Variable shutter close timing. 16 & 17 Asymmetrical Dual 2D 1or Asymmetrical Single 3D Optional4 Individual 2D images sent to Left & Right eyes or single 3D image sent as

16、 1stimage to Left eye and 2ndimage to Right eye. CTA-2038 6 1Multiple 2D views or 3D view are selected on the eyewear and support is optional, however eyewear without selection supporting such modes shall default to 3D. 2Multiple 3D views are selected on the eyewear and support is optional, however

17、eyewear without selection supporting such modes shall default to 3D with 1stand 2ndimages. 3Multiple 2D views are selected on the eyewear and support is optional, however eyewear without selection supporting such modes shall default to 2D with 1stimage. 4Unsupported modes shall be treated as the shu

18、tdown mode by the eyewear. 4.3.2 Command Timing a. The transmit time for each command shall be equal, the actual time depends on the short or long encoding selected. b. The actual transmit time shall be 305uS for short command encoding, and 1220uS for long command encoding. c. The time between a com

19、mand and the associated shutter action for all symmetric modes shall be 1/16thof the command repetition period as measured at the center of the command. d. The time between a command and the associated shutter action for all asymmetric modes shall be equal to the command transmission time offset fro

20、m the center of the command. e. The time between a command and any shutter action for all symmetric modes should be 1/16thof the command repetition period as measured at the center of the command. f. The time between a command and the any shutter action for all asymmetric modes should be equal to th

21、e command transmission time offset from the center of the command. g. The commands should be separated by at least one command transmission period. h. The lens transition from open to closed shall be when the transmittance is at or below 1%. i. The lens transition from closed to open shall be when t

22、he transmittance is at or above 1%. j. A swap transition of the lenses for 3D modes shall first close the previously open lens, and then open the previously closed lens if the actions cannot be simultaneous due to system design. The swap lens transition shall be complete when the closing lens transm

23、ittance is at or below 1% and the opening lens reaches a transmittance of 1%. k. Simultaneous lens transactions for 2D modes shall have the same lens transitioning first for opening and closing transitions to ensure more balanced timing between the lenses. Simultaneous lens transitions shall be comp

24、lete when the last lens has transitioned to the 1% transmittance. See Annex A for detailed timing diagrams show valid and invalid cases. l. See detailed description of operational modes in Annex A for implied lens open and close times. 4.3.3 Command Sequencing The following table summarizes the comm

25、and sequences and resulting implied modes of operation. More detailed timing diagrams can be found in Annex A. CTA-2038 7 Table 2: Command Sequence Summary Operational Mode Closed Duty Command Sequence Command Timing Dependence* Mode Number Eyewear Shutdown NA No Commands None 1 Symmetrical Single 3

26、D Short A1, B1 Time(B1) Time(A1) Tperiod/2 2 Long B2, A2 Time(A2) Time(B2) Tperiod/2 3 Swap Single 3D None A1 None 4 Symmetrical Dual 2D Short A1, B1 Time(B1) Time(A1) Tperiod/2 11 Long B2, A2, A2 Time(A2) Time(B2) Tperiod/2 12 Swap Dual 3D None B1 None 13 Symmetrical Quad 2D Short A1, B1, B1 Time(B

27、1) Time(A1) Tperiod/2 Specific timing requirements Time B1(n) Time A1(n) + Tperiod/2 + 2*Tdelay Time B1(n) Tperiod/2 Specific timing requirements Time A2(n) Time B2(n) + Tperiod/2 Time A2(n) Time A1(n) + 2*Tdelay Time B1(n) Tperiod/2 Specific timing requirements Time A2(n) Time B2(n) + Tdelay + 2*Tc

28、ommand Time A2(n) Time A1(n) + 2*Tdelay Time B2(n) Time B1(n) + 2*Tcommand Time A2(n) Time B1(n+1) 2*delay Command sequence, lens state and image timing circle Tperiod Time B1(n) Time B1(n-1) Tdelay Tperiod/16 Tcduty Time A2(n) Time B1(n) + 2*Tdelay Tclose-both Time B1(n) - Tdelay Topen-both Tclose-both + Tcduty Figure 12: Mode 9 Single 2D with Long Close Duty Timing