Liquid crystal display device and electronic apparatus

• US 20060044240A1
• Filed: 08/29/2005
• Published: 03/02/2006
• Est. Priority Date: 09/02/2004
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Takizawa, Keiji, Kato, Tatsuya
• Granted Patent: US 7,626,660 B2
• Time in Patent Office: Days
• US Class Current: 345/88
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/1365 in which the switching element is a two-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G09G 2300/0439 Pixel structures
• CPC Class Codes: G09G 2300/0456 with a reflective area and a transmissive area combined in one pixel, such as in transflectance pixels
• CPC Class Codes: G09G 3/367 with a nonlinear element in series with the liquid crystal cell, e.g. a diode, or M.I.M. element

Abstract

A liquid crystal display device includes a pair of substrates composed of a first substrate and a second substrate, which are disposed opposite to each other with a liquid crystal layer interposed therebetween; a plurality of pixels arranged in a matrix; reflective layers that are provided on the second substrate and reflects incident light from the first substrate side; a plurality of sub-pixels constituting each of the plurality of pixels; color filters on which colored layers having different colors are arranged, each of the colored layers corresponding to each of the sub-pixels; and an illumination unit provided at an outer surface side of the second substrate. The liquid crystal display device is a transflective liquid crystal display device for displaying images through a reflective region and a transmissive region, which are provided in each of the sub-pixels. The reflective region of each sub-pixel is a region for black and white display or monochrome gray-scale display, the transmissive region is a region for color display in the pixels, and reflectance of the reflective region of each sub-pixel is different for each of the sub-pixels having different colors.

Claims

1. A liquid crystal display device comprising:

a pair of substrates composed of a first substrate and a second substrate, which are disposed opposite to each other with a liquid crystal layer interposed therebetween;

a pixel including a plurality of sub-pixels;

a reflective layer that is provided in between the second substrate and the liquid crystal layer and that reflects incident light from the first substrate side;

a color filter including colored layers that having different colors, the colored layers corresponding to the sub-pixels; and

a reflective region and a transmissive region provided in each of the sub-pixels, the reflective region of each sub-pixel being for black and white gray-scale display or monochrome gray-scale display, the transmissive region of each sub-pixel being for color display in the pixel, and the reflective regions in different color sub-pixels having different reflectance.

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

wherein an area of the reflective region of each sub-pixel be different for each of the sub-pixels having different colors.

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

wherein areas of the sub-pixels are equal to each other, and an area of the reflective region for each sub-pixel be different for each sub-pixel as an area of the transmissive region for each sub-pixel is set to be different for each sub-pixel.

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

wherein a light shielding portion overlapping the reflective region of each sub-pixel, and

an area of the reflective region different for each sub-pixel as an area of the light shielding portion provided for each sub-pixel is set to be different for each sub-pixel.

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

wherein the light shielding portion is composed of a light shielding film provided between the sub-pixels or be composed of a wiring line.

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

wherein unevenness is provided in the reflective layer of each sub-pixel, and

a degree of scattering of light reflected by the unevenness of each sub-pixel be different for each of the sub-pixel having different colors.

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

wherein openings are provided in the reflective layers of at least two sub-pixels, and

the areas of the openings of at least two sub-pixels different.

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

wherein a spacer for defining a cell gap overlaps each of the reflective layers of at least two sub-pixels, and

an occupied area of the spacer in each sub-pixel be different for each sub-pixel.

9. The liquid crystal display device according to claim 1, further comprising:

a filter that adjusts the intensity of incident light and that is provided in at least two sub-pixels,

wherein an occupied area or light transmissivity of the filter in each sub-pixel be different for each sub-pixel.

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

wherein the colored layers have different colors corresponding to red (R), green (G) and blue (B), and

the reflectance of the reflective layers of the sub-pixels become high in the order of a green (G) sub-pixel, a red (R) sub-pixel, and a blue (B) sub-pixel.

11. An electronic apparatus comprising the liquid crystal display device according to claim 1.