Electro-optical device and electronic apparatus

• US 7,701,533 B2
• Filed: 07/07/2006
• Issued: 04/20/2010
• Est. Priority Date: 07/07/2005
• Status: Expired due to Fees

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Epson Imaging Devices Corporation (Seiko Group)
• Inventors: Uehara, Toshinori, Kobayashi, Kazu, Tanaka, Chihiro, Tanaka, Shinichiro, Horiguchi, Masahiro, Kaneko, Hideki
• Primary Examiner(s): Font; Frank G
• Assistant Examiner(s): Radkowski; Peter
• Application Number:
  US11/456,125
• Publication Number:
  US 20070008461A1
• Time in Patent Office: 1,383 Days
• Field of Search: 349/106, 349/108, 345/614, 382/300
• US Class Current: 349/106
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 2201/52 RGB geometrical arrangements

Abstract

An electro-optical device includes: a plurality of display pixels each of which has two Red sub-pixels, two Green sub-pixels, one Blue sub-pixel, and one transparent sub-pixel; and a colored layer which is partially formed on the Red, Green, and Blue sub-pixels. In the electro-optical device, uncolored portions are formed in parts of the Red and Green sub-pixels where the colored layer is not formed.

Claims

1. An electro-optical device comprising:

a plurality of display pixels each of which has two Red sub-pixels, two Green sub-pixels, one Blue sub-pixel, and one transparent sub-pixel;

colored layers including a Red colored layer, a Green colored layer, and a Blue colored layer which are formed on the Red, Green, and Blue sub-pixels respectively; and

at least one uncolored portion formed in parts of each of the Red and Green sub-pixels where the colored layers are not formed, wherein each of the Blue sub-pixels is entirely and substantially uniformly colored,

wherein the Red colored layer and the Green colored layer enclose the at least one uncolored portion formed on the Red and Green sub-pixels respectively and the at least one uncolored portion allows light to pass through,

wherein the area of the at least one uncolored portion is determined such that white balance in white display is adjusted to a predetermined color temperature.

2. The electro-optical device according to claim 1, wherein in each of the plurality of display pixels, the total area of the Blue sub-pixel and the transparent sub-pixel is substantially equal to the area of the two Red sub-pixels and is substantially equal to the area of the two Green sub-pixels.

3. The electro-optical device according to claim 1, wherein each of the Red, Green, and Blue sub-pixels has a transmissive region and a reflective region, and a first uncolored portion of the at least one uncolored portion is formed in the transmissive region of each of the Red and Green sub-pixels.

4. The electro-optical device according to claim 1, wherein each of the Red, Green, and Blue sub-pixels has a transmissive region and a reflective region, and a second uncolored portion of the at least one uncolored portion is formed in the reflective region of each of the Red and Green sub-pixels.

5. The electro-optical device according to claim 4, wherein the at least one uncolored portion includes a plurality of uncolored portions and a first uncolored portion of the plurality of uncolored portions is formed in the transmissive region of each of the Red and Green sub-pixels.

6. The electro-optical device according to claim 3, wherein the area of the first uncolored portion of each of the Green sub-pixels is larger than the area of the first uncolored portion of each of the Red sub-pixels.

7. The electro-optical device according to claim 4, wherein the area of the second uncolored portion of each of the Green sub-pixels is larger than the area of the second uncolored portion of each of the Red sub-pixels.

8. The electro-optical device according to claim 1, wherein the chromaticity of white displayed by using the Red, Green, Blue, and transparent sub-pixels is in a coordinate range expressed by (X, Y)=(0.3 to 0.4, 0.3 to 0.4) in a CIE (International Commission on Illumination) chromaticity diagram.

9. The electro-optical device according to claim 1, wherein the at least one uncolored portion of each of the Red sub-pixels has an area larger than 10% of the area of the Red sub-pixel.

10. The electro-optical device according to claim 1, wherein the at least one uncolored portion of each of the Green sub pixels has an area larger than 30% of the area of the Green sub-pixel.

11. The electro-optical device according to claim 1, wherein each of the Red, Green, and Blue sub-pixels of one of the plurality of display pixels performs display by superimposing a gray-scale signal which is applied for display of the sub-pixels in one display pixel to sub-pixels having the same color with the one display pixel around the one display pixel.

13. An electronic apparatus comprising the electro-optical device according to claim 1 as a display unit.

14. The electro-optical device according to claim 1, wherein each of the Red, Green, and Blue sub-pixels has a transmissive region, and the at least one uncolored portion is formed in the transmissive region of each of the Red and Green sub-pixels.

15. The electro-optical device according to claim 1, wherein the area of the at least one uncolored portion is determined such that red, green, and blue colored light displayed by the colored layers are balanced in a white display.

12. An electro-optical device comprising:

a plurality of display pixels each of which has at least one transparent sub-pixel, one Red sub-pixel, one Green sub-pixel, and one Blue sub-pixel; and

a Red colored layer, a Green colored layer, and a Blue colored layer which are formed on the Red, Green, and Blue sub-pixels respectively,

wherein an uncolored portion is provided in a part of each of the Red and Green sub-pixels where the colored layer is not formed, wherein each of the Blue sub-pixels is entirely and substantially uniformly colored,

wherein the Red colored layer and the Green colored layer enclose the at least one uncolored portion formed on the Red and Green sub-pixels respectively and the at least one uncolored portion allows light to pass through,

wherein the area of the at least one uncolored portion is determined such that white balance in white display is adjusted to a predetermined color temperature.