Digital backplane

• US 7,071,908 B2
• Filed: 05/20/2004
• Issued: 07/04/2006
• Est. Priority Date: 05/20/2003
• Status: Active Grant

• Current Assignee: Syndiant Incorporated
• Original Assignee: Kagutech Ltd.
• Inventors: Guttag, Karl M., Guttag, Alvin
• Primary Examiner(s): Shankar, Vijay
• Assistant Examiner(s): DHARIA, PRABODH M
• Application Number:
  US10/849,195
• Publication Number:
  US 20040233150A1
• Time in Patent Office: 775 Days
• Field of Search: 345/87, 345/467, 345/100, 345/90, 345/4, 345/542, 345/60, 345690-693, 345/904, 382/131, 382/54, 382/274, 359/298, 359/244, 385/4, 385/9, 385/19, 369/44.12, 353/20, 711/163, 347/239, 347/241, 378/98.8, 378/62, 378/19, 436/43, 701/213, 701/214, 708/130, 714/31, 714/800, 364/413, 372/92, 358/141, 358/166, 399/74, 399/49, 348/614, 455/52.3, 340/635, 428/1.1
• US Class Current: 345/87
• CPC Class Codes: G06F 3/147 using display panels
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0857 Static memory circuit, e.g. flip-flop
• CPC Class Codes: G09G 2310/0221 with use of split matrices G09G3/3644 and G09G3/3666 take precedence
• CPC Class Codes: G09G 2310/0275 Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
• CPC Class Codes: G09G 3/2014 by modulation of the duration of a single pulse during which the logic level remains constant
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/34 by control of light from an independent source
• CPC Class Codes: G09G 3/346 based on modulation of the reflection angle, e.g. micromirrors micromirrors devices per se G02B26/0833
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

The present invention provides a various methods, systems and devices for controlling light modulating elements and/or spatial light modulators. In some embodiments of the present invention, a recursive feedback method is used to control light modulating elements and/or spatial light modulators.

Claims

1. A device comprising:

electrode means comprising at least one electrode for controlling a light modulating element of an array of light modulating elements; and

recursive feedback control means for controlling at least one pulse width using recursive feedback, said pulse width driving said electrode means.

2. The device of claim 1, wherein said recursive feedback is based on an output bit.

3. The device of claim 2, wherein said output bit is a drive output bit.

4. The device of claim 2, wherein said output bit is an intermediate output bit.

5. The device of claim 1, wherein said device includes a backplane and wherein said backplane includes said recursive feedback control means.

6. The device of claim 1, wherein said device includes a panel interface controller and wherein said panel interface controller includes said recursive feedback control means.

7. The device of claim 1, wherein said electrode means comprises at least two electrodes.

8. The device of claim 1, wherein said array of light modulating elements is part of a visual display apparatus.

9. The device of claim 1, wherein said array of light modulating elements is on a single silicon backplane.

10. The device of claim 1, wherein said recursive feedback is explicit.

11. The device of claim 1, wherein said recursive feedback is implicit.

12. The device of claim 1, wherein said at least one pulse width comprises at least two pulse widths.

13. The device of claim 1, wherein said device includes a plurality of pixel value bits for controlling a pixel value of said pulse width and wherein said recursive feedback control means only uses some of said pixel value bits to determine a next state of said pulse width.

14. The device of claim 1, further comprising a visual display apparatus including said array of light modulating elements.

15. The device of claim 14, wherein said visual display apparatus is an LCoS device and wherein said visual display apparatus includes pH indicating means indicating when a liquid crystal and/or the environment surrounding said liquid crystal of said visual display apparatus is damaged.

16. The device of claim 1, wherein said device is a visual display apparatus.