Method of making an SLM, SLM, autostereoscopic display, and backlight

• US 5,833,507 A
• Filed: 07/03/1996
• Issued: 11/10/1998
• Est. Priority Date: 07/04/1995
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Harrold, Jonathan, Woodgate, Graham John, Ezra, David
• Primary Examiner(s): Ramsey, Kenneth J.
• Application Number:
  US08/675,584
• Time in Patent Office: 860 Days
• Field of Search: 445/24, 349/106, 349/109, 349/110
• US Class Current: 445/24
• CPC Class Codes: G02B 30/27 involving lenticular arrays
• CPC Class Codes: G02B 30/30 involving parallax barriers
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements
• CPC Class Codes: H04N 13/156 Mixing image signals
• CPC Class Codes: H04N 13/305 using lenticular lenses, e.g. arrangements of cylindrical lenses
• CPC Class Codes: H04N 13/31 using parallax barriers
• CPC Class Codes: H04N 13/312 the parallax barriers being placed behind the display panel, e.g. between backlight and spatial light modulator [SLM]
• CPC Class Codes: H04N 13/324 Colour aspects
• CPC Class Codes: H04N 13/366 using viewer tracking

Abstract

In order to provide an active matrix liquid crystal spatial light modulator suitable for use in autostereoscopic displays, the conventional delta arrangement of liquid crystal pixels is formed. However, instead of forming the conventional black mask, a new type of black mask is provided. This black mask defines groups of two or more columns of pixel openings such that the columns of each group are substantially contiguous.

Claims

1. A method of making an active matrix liquid crystal spatial light modulator, comprising:

forming on a first substrate an array of addressing electrodes defining an array of liquid crystal pixels in which at least some of the pixels overlap in a predetermined direction;

forming on at least one of the first substrate and a second substrate an opaque mask defining pixel openings which are arranged to be optically aligned with respective ones of the pixels and which are arranged as groups of N adjacent columns of pixel openings, where N is an integer greater than one, such that the columns extend substantially perpendicularly to the predetermined direction and such that the columns of each group are substantially contiguous.

2. The method of claim 1, wherein the array of pixels is ordered in a delta arrangement.

3. The method of claim 1, further including forming a filter comprising color stripes extending substantially perpendicularly to the columns.

4. The method of claim 3, wherein each of the color stripes is aligned with a row of pixels.

5. The method of claim 3, wherein each of the color stripes is aligned with two adjacent rows of pixels.

6. The method of claim 3, wherein the filter comprises repeating sets of red, green, and blue color stripes.

7. The method of claim 1, further including forming a filter comprising color stripes extending diagonally with respect to the columns, each of the color stripes being aligned with a line of pixels.

8. The method of claim 6, wherein the filter comprises repeating sets of red, green, and blue color stripes.

9. The method of claim 1, wherein the pixel openings are of substantially constant and equal height in all axes substantially perpendicular to the predetermined direction.

10. A liquid crystal spatial light modulator made by the method of claim 1.

11. An autostereoscopic display comprising the spatial light modulator of claim 10 and a parallax screen.

12. The display of claim 11, wherein the parallax screen comprises a lenticular screen, wherein each lenticule of the lenticular screen is aligned with a respective group of columns.

13. The display of claim 11, wherein the parallax screen comprises a parallax barrier, wherein each slit of the parallax barrier is aligned with a respective group of columns.

14. The display of claim 11, wherein the spatial light modulator has a plurality of color inputs connected to a processing circuit for supplying each of the color inputs with image data of a respective view.

15. A backlight for an autostereoscopic display comprising the spatial light modulator of claim 10 and an extended light source.

16. An autostereoscopic display comprising the backlight of claim 15.