Spatial light modulator and display with reduced electrical connectivity requirement

• US 6,094,249 A
• Filed: 07/29/1998
• Issued: 07/25/2000
• Est. Priority Date: 07/31/1997
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Tombling, Craig, Bonnett, Paul, Towler, Michael John, Robinson, Michael Geraint, Mayhew, Nicholas
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): CHOWDHURY, TARIFUR RASHID
• Application Number:
  US09/124,655
• Time in Patent Office: 727 Days
• Field of Search: 349/141, 349/143, 349/145, 349/147, 349/25
• US Class Current: 349/141
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/141 using ferroelectric liquid crystals
• CPC Class Codes: G02F 1/292 by controlled diffraction or phased-array beam steering controlled diffraction for optical switching G02F1/31
• CPC Class Codes: G02F 2201/124 interdigital
• CPC Class Codes: G03H 2225/23 Grating based SLM

Abstract

A spatial light modulator includes at least three picture elements, each of which includes a plurality of first elongate electrodes which are connected together and a plurality of second elongate electrodes which are connected together and which are interdigitated with the first electrodes. The first electrodes of a second of the picture elements are connected to the second electrodes of a first of the picture elements and the second electrodes of the second picture element are connected to the first electrodes of a third of the picture elements.

Claims

1. A spatial light modulator comprising at least three picture elements, each of which comprises a plurality of first elongate electrodes which are connected together and a plurality of second elongate electrodes which are connected together and which are interdigitated with the first electrodes,

wherein, the first elongate electrodes of a second of the picture elements are connected to the second elongate electrodes of a first of the picture elements and the second electrodes of the second picture element are connected to the first electrodes of a third of the picture elements, and

wherein, the at least three picture elements form at least one row of n picture elements where n is an integer greater than two, the first electrode of each ith picture element being connected to the second electrode of the (i-1)th picture element and the second electrode of each ith picture element being connected to the first electrode of the (i+1)th picture element, where i is each integer satisfying 1<

i<

n.

2. A modulator as claimed in claim 1, wherein the at least one row of n picture elements includes a third electrode which is common to the n picture elements.

3. A modulator as claimed in claim 1, wherein the at least three picture elements form a plurality of columns of picture elements, the first electrodes of the picture elements of each column being connected together and the second electrodes of the picture elements of each column being connected together.

4. A modulator as claimed in claim 1, wherein the at least one row of n picture elements form a plurality of groups of rows of picture elements, each group comprising a plurality of columns of picture elements, the first electrodes of the picture elements of each column of each group being connected together and the second electrodes of the picture elements of each column of each group being connected together.

5. A modulator as claimed in claim 1, wherein the first and second electrodes are connected to a digital signal generator.

6. A modulator as claimed in claim 1, further comprising an active matrix addressing arrangement connected to the first electrodes of each of the picture elements.

7. A modulator as claimed in claim 1, further comprising a layer of electro-optic material.

8. A modulator as claimed in claim 7, wherein the electro-optic material comprises a liquid crystal.

9. A modulator as claimed in claim 8, wherein the liquid crystal is a ferroelectric liquid crystal.

10. A modulator as claimed in claim 1, wherein the picture elements are arranged as groups of m adjacent picture elements of different areas, where m is an integer greater than one.

11. A display comprising a modulator as claimed in claim 1, a light source for illuminating the modulator, and an optical system for gathering light from the modulator.

12. A display as claimed in claim 11, wherein the optical system is arranged to gather light diffracted by the picture elements of the modulator.

13. A display as claimed in claim 11, wherein the optical system is a projection optical system.