COLOR DISPLAY, LIQUID CRYSTAL DISPLAY, AND SEMI-TRANSMISSIVE LIQUID CRYSTAL DISPLAY

• US 20150035738A1
• Filed: 10/20/2014
• Published: 02/05/2015
• Est. Priority Date: 10/10/2006
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated, Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: KOMURA, Shinichi, SEKIGUCHI, Yoshifumi, YAMAMOTO, Tsunenori, ADACHI, Masaya, HIROTA, Shoichi
• Granted Patent: US 9,626,918 B2
• Time in Patent Office: Days
• US Class Current: 345/88
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• 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 2320/0219 Reducing feedthrough effects in active matrix panels, i.e. voltage changes on the scan electrode influencing the pixel voltage due to capacitive coupling
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3607 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels

Abstract

In a color display device, when using white (W) sub-pixels in addition to subpixels of red (R) and green (G) plus blue (B) without increasing a wiring line number, the per-color pixel number in a unit area decreases so that the image resolution is deteriorated. The area and number of subpixels are adjusted in accordance with the visual sensitivity or luminosity required. Practically, the area of red (R) and blue (B) subpixels which are relatively low in luminosity is set to be about two times greater than the area of green (G) and white (W) subpixels that are relatively high in luminosity while letting the number of green (G) and white (W) subpixels be twice the number of red (R) and blue (B) subpixels. A larger subpixel is configured from a plurality of unit subpixels. A smaller subpixel is formed of a one unit subpixel.

Claims

1. A color display device comprising:

a matrix array of unit pixel;

the unit pixel including four types of sub-pixels;

a first type of sub-pixel including a red color filter;

a second type of sub-pixel including a blue color filter;

a third type of sub-pixel including a green color filter; and

a fourth type of sub-pixel including a white color filter;

wherein the white color filter including a transparent resist material,

each type of sub-pixel includes thin-film transistor;

the third and fourth type of sub-pixel has an aspect ratio that is set at about 1;

1,

a gate of the thin-film transistors of the third type of sub-pixels and the fourth type of sub-pixels is electrically connected to a same gate signal line,

the third type of sub-pixels and the fourth type of sub-pixels are formed between a first image signal line and a second image signal line,

the first image signal line applies an image signal to the third type of sub-pixel, and

the second image signal line applies the image signal to the fourth type of sub-pixel.

2. A color display device according to claim 1,

wherein the gate signal line and the first and second image signal lines are intersected with each other.

3. A color display device according to claim 1,

wherein the color display device is a liquid crystal display device.

4. A color display device according to claim 1,

further comprising a black matrix formed between the third type of the sub-pixel and the fourth type of the sub-pixel.

5. A color display device comprising:

a matrix array of unit pixel;

the unit pixel including a red, blue, green and white type of sub-pixels;

wherein the white type of sub-pixel including a transparent resist material,

each type of sub-pixel includes thin-film transistor,

a first sub-pixel which is the green type of sub-pixel has an aspect ratio that is set at about 1;

1,

a second sub-pixel which is the white type of sub-pixel has an aspect ratio that is set at about 1;

1,

a gate of the thin-film transistors of the first sub-pixel and the second sub-pixel is electrically connected to a same gate signal line,

the first sub-pixel and the second sub-pixel are formed between a first image signal line and a second image signal line,

the first image signal line applies an image signal to the first sub-pixel, and

the second image signal line applies the image signal to the second sub-pixel.

6. A color display device according to claim 5,

wherein the gate signal line and the first and second image signal lines are intersected with each other.

7. A color display device according to claim 5,

wherein the color display device is a liquid crystal display device.

8. A color display device according to claim 5, further comprising a black matrix formed between the first sub-pixel and the second sub-pixel.