DISPLAY WITH REDUCED MOIRE EFFECT

• US 20100277446A1
• Filed: 12/07/2005
• Published: 11/04/2010
• Est. Priority Date: 12/10/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Polymer Vision Ltd. (Wistron Corporation)
• Inventors: Van Rens, Bas Jan Emile, van Veenendaal, Erik, Huitema, Hjalmar Edzer Ayco
• Granted Patent: US 8,077,283 B2
• Time in Patent Office: Days
• US Class Current: 345/205
• CPC Class Codes: G02F 1/133377 Cells with plural compartments or having plurality of liquid crystal microcells partitioned by walls, e.g. one microcell per pixel
• CPC Class Codes: G02F 1/167 by electrophoresis

Abstract

A display has reduced moire interference. The display has a backplane with a regular array of pixels and a frontplane with a regular array of cells. The backplane and frontplane are laminated together. The width of the distribution of aperture (the total inner cell area above an active pixel area divided by total pixel area) over the display is reduced. Sinusoidally curved walls or other curved pixel edges may be used in the frontplane or backplane to control the distribution.

Claims

1. A display comprising:

a backplane having an array of electronics pixels, two or more of the electronics pixels each having an active pixel area and a total pixel area; and

a frontplane comprising an array of electro-optic elements,

the frontplane being fixed to the backplane,

the active pixel areas of at least two of the two or more electronics pixels in the backplane being opposite respective inner cell areas of a corresponding at least two of the two or more electro-optic elements and forming at least respective first and second display elements of the display,

the first and second display elements each having an aperture, and

the aperture of the first display element having a predetermined value different from the aperture of the second display element.

2. The display of claim 1, wherein the predetermined value of the aperture is the total inner cell area of the respective first or second display element divided by the total pixel area of that respective first or second display element.

3. The display of claim 1, wherein a relative width of distribution of aperture is determined as a percentage equal to:

2×

100×

(Max_aperture−

Min_aperture)/(Max_aperture+Min_aperture)

where Max_aperture is the maximum aperture of a pixel of the display and Min_aperture is the minimum aperture of a pixel of the display; and

the display has a predetermined relative width of distribution of aperture.

4. The display of claim 1, wherein an electro-optic element comprises one or more electro-optic cells having one or more curved walls.

5. The display of claim 4, wherein one of the one or more curved walls is curved sinusoidally.

6. The display of claim 1, wherein an electro-optic element comprises one or more electro-optic cells having jagged edges.

7. The display of claim 6, wherein one or more of the one or more electro-optic cells has edges formed in a saw tooth pattern.

8. The display of claim 1, wherein one or more of the electronics pixels has curved edges.

9. The display of claim 8, wherein one of the one or more curved edges is curved sinusoidally.

10. The display of claim 1, wherein one or more of the electronics pixels has jagged edges.

11. The display of claim 10, wherein one or more of the electronics pixels has edges formed in a saw tooth pattern.

12. A method of manufacture of a display comprising:

providing a backplane having an array of electronics pixels; and

determining a desired geometry for a frontplane having an array of opto-electronic pixel elements, the desired geometry having reduced aperture with respect to a value of aperture in a display in which cells of the opto-electronic pixel elements are rectangular in shape and substantially symmetrical with cells of the electronics pixels.

13. The method of claim 12 comprising laminating the backplane to a frontplane with the desired geometry.

14. The method of claim 12 wherein an opto-electronic pixel element in a frontplane of the desired geometry comprises one or more opto-electronic cells with curved walls.

15. The method of claim 14, wherein one or more walls of the opto-electronic cell with curved walls is curved sinusoidally.

16. The method of claim 12 wherein an opto-electronic pixel element in a frontplane of the desired geometry comprises one or more opto-electronic cells with walls extending in a jagged pattern.

17. The method of claim 16 wherein one or more of the one or more opto-electronic cells with walls extending in a jagged pattern, has walls which extend in a saw tooth pattern.

18. A method of designing a display screen comprising:

determining a variation in aperture of pixels of two or more possible pixel arrays for the display screen; and

choosing for the display screen a one of the two or more possible arrays, the one of the two or more possible pixel arrays chosen having a relative width of aperture less than a second of the two or more possible arrays.

19. The method of claim 18, wherein a pixel of the display screen comprises an electronics pixel and an opto-electronic pixel element laminated together, the aperture of the pixel being a total inner pixel area of the opto-electronic pixel element opposite an active pixel area of the electronics pixel divided by a total pixel area of the electronics pixel element and the relative width of aperture being calculated as a percentage equal to:

2×

100×

(Max_aperture−

Min_aperture)/(Max_aperture+Min_aperture)

where Max_aperture is the maximum aperture of a pixel of the display and Min_aperture is the minimum aperture of a pixel of the display