# US 7,071,908 B2 · Digital backplane

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- Number: US 7,071,908 B2
- Document ID: US7071908B2
- Status: Granted
- Kind: B2
- Application number: 10/849,195
- Filed: 2004-05-20
- Published: 2004-11-25
- Granted: 2006-07-04
- Earliest claimed: 2003-05-20
- Assignees: Kagutech, Ltd.
- Inventors: Karl M. Guttag; Alvin Guttag
- Web page: https://patentgrep.com/patent/US7071908B2

## CPC

- G09G 5/10: Intensity circuits
- G09G 3/34: by control of light from an independent source
- G06F 3/147: using display panels
- G09G 3/2014: {by modulation of the duration of a single pulse during which the logic level remains constant}
- G09G 3/2022: {using sub-frames}
- G09G 3/346: {based on modulation of the reflection angle, e.g. micromirrors (micromirrors devices per se G02B26/0833)}
- G09G 2300/0809: Several active elements per pixel in active matrix panels
- G09G 2300/0857: Static memory circuit, e.g. flip-flop
- G09G 2310/0221: with use of split matrices (G09G3/3644 and G09G3/3666 take precedence)
- 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
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## 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

### Claim 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.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 2)

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

### Claim 4 (depends on 2)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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.

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 1)

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

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

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

### Claim 13 (depends on 1)

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.

### Claim 14 (depends on 1)

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

### Claim 15 (depends on 14)

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.

### Claim 16 (depends on 1)

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