Liquid crystal display device and electronic apparatus

• US 20070008463A1
• Filed: 07/06/2006
• Published: 01/11/2007
• Est. Priority Date: 07/06/2005
• Status: Abandoned Application

• Current Assignee: Epson Imaging Devices Corporation (Seiko Group)
• Original Assignee: Sanyo Epson Imaging Devices Corporation (Seiko Group)
• Inventors: Horiguchi, Masahiro, Sekime, Tomoaki, Kobayashi, Kazu, Tanaka, Chihiro
• Application Number:
  US11/480,836
• Publication Number:
  US 20070008463A1
• Time in Patent Office: Days
• US Class Current: 349/107
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 2202/40 Materials having a particular birefringence, retardation

Abstract

A liquid crystal display device includes a pair of substrates, a display pixel that has four R, G, B, and non-colored subpixels, and a liquid crystal layer that is interposed between the pair of substrates and in which cell thicknesses in the subpixels vary. The retardation values of the R, G, and B subpixels are set in the ranges of 360 nm≦R≦700 nm, 340 nm≦G≦600 nm, and 340 nm≦B≦500 nm, respectively, and the non-colored subpixel has a cell thickness at which the display pixel becomes predetermined white balance.

Claims

1. A liquid crystal display device comprising:

a pair of substrates;

a display pixel that has four R, G, B, and non-colored or white subpixels; and

a liquid crystal layer that is interposed between the pair of substrates and in which cell thicknesses in the subpixels vary,

wherein the retardation values of the R, G, and B subpixels are set in the ranges of 360 nm≦

R≦

700 nm, 340 nm≦

G≦

600 nm, and 340 nm≦

B≦

500 nm, respectively, and the non-colored subpixel has a cell thickness at which the display pixel becomes predetermined white balance.

2. The liquid crystal display device according to claim 1,

wherein the cell thickness of the non-colored or white subpixel is set to be substantially equal to the cell thickness of a one-color subpixel among the R, G, and B subpixels, in which the area occupied in the display pixel is the smallest.

3. The liquid crystal display device according to claim 1,

wherein the display pixel is configured such that the sum area of the non-colored or white subpixel and a one-color subpixel among the R, G, and B subpixels are substantially equal to an area of each of the other-color subpixels, and

the cell thickness of the non-colored subpixel is set to a value at which the retardation value of the one-color subpixel and the retardation value of the non-colored or white subpixel become equal to each other.

4. The liquid crystal display device according to claim 3,

wherein the display pixel is configured such that the area ratio of the R, G, B, and non-colored or white subpixels is set to 2:

2;

1;

1, and

the cell thickness of the non-colored or white subpixel is set to be substantially equal to the cell thickness of the B subpixel.

5. The liquid crystal display device according to claim 1,

wherein the display pixel is configured such that the areas of four subpixels are substantially equal to one another, and

the cell thickness of the non-colored or white subpixel is set to a value at which the retardation value of the G subpixel and the retardation value of the non-colored or white subpixel become equal to each other.

6. The liquid crystal display device according to claim 5,

wherein the cell thickness of the non-colored or white subpixel is set to be substantially equal to the cell thickness of the G subpixel.

10. An electronic apparatus comprising the liquid crystal display device according to claim 1 as a display unit.

7. A liquid crystal display device comprising:

a pair of substrates;

a display pixel that has four R, G, B, and non-colored or white subpixels and is configured such that the area ratio of the R, G, B, and non-colored or white subpixels is set to 2;

2;

1;

1; and

a liquid crystal layer that is interposed between the pair of substrates and in which cell thicknesses in the subpixels vary,

wherein, if the cell thicknesses are set to dr, dg, db, and dw, the R, G, B, and non-colored or white subpixels have the relationship dr≧

dg≧

dw=db (however, the relationship dr=dw=db is not established).

8. A liquid crystal display device comprising:

a pair of substrate;

a display pixel that has four R, G, B, and non-colored or white subpixels; and

a liquid crystal layer that is interposed between the pair of substrates and in which cell thicknesses in the subpixels vary,

wherein, if the cell thicknesses are set to dr, dg, db, and dw, the R, G, B, and non-colored or white subpixels have the relationship dr≧

dw≈

dg≧

db (however, the relationship dr=dw=db is not established).

9. The liquid crystal display device according to claim 8,

wherein the display pixel is configured such that the area ratio of the R, G, B, and non-colored or white subpixels is set to 1:

1;

1;

1.