Display device

• US 10,068,541 B2
• Filed: 02/29/2016
• Issued: 09/04/2018
• Est. Priority Date: 03/05/2015
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Sakaigawa, Akira
• Primary Examiner(s): Balaoing, Ariel
• Application Number:
  US15/055,652
• Publication Number:
  US 20160260401A1
• Time in Patent Office: 918 Days
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• 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 2300/0465 Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• 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

Abstract

According to an aspect, a display device comprising a display unit that produces a display output corresponding to an input signal. The display unit combines the display output corresponding to each of four or more colors. The display unit includes a plurality of pixels each including three or more sub-pixels, the number of which is smaller than the number of colors. The pixel includes, as the sub-pixels, one first sub-pixel having largest display region among the sub-pixels and two or more second sub-pixels each having a display region smaller than that of the first sub-pixel. One of the second sub-pixels outputs a high luminance color having highest luminance among the four or more colors.

Claims

1. A display device comprising a display unit that produces a display output corresponding to an input signal, the display unit combining the display output corresponding to each of four or more colors, the display unit including:

a plurality of pixels that are arranged in a row direction and a column direction, each of the pixels including three or more sub-pixels, the number of which is smaller than the number of colors; and

a plurality of scanning lines each extending in the row direction, the scanning lines including a first scanning lines and a second scanning line, wherein

each of the pixels includes;

as the sub-pixels, one first sub-pixel having largest display region among the sub-pixels and two or more second sub-pixels each having a display region smaller than that of the first sub-pixels,

a first switch element in the first sub-pixel,

a second switch element in one of the two or more second sub-pixels, and

a third switch element in another of the two or more second sub-pixels,

the first switch element and the second switch element are coupled to the first scanning line,

the third switch element is coupled to the second scanning line, and

one of the second sub-pixels outputs a high luminance color having highest luminance among the four or more colors.

2. The display device according to claim 1, wherein the sub-pixels included in one pixel output colors different from each other.

3. The display device according to claim 1, wherein

combinations of colors of the sub-pixels included in each of adjacent pixels are different in at least one of the row direction and the column direction, and a color arrangement of the sub-pixels is periodically repeated in units of a predetermined number of pixels in the one direction.

4. The display device according to claim 1, wherein

the two or more second sub-pixels are aligned in one of the row direction and the column direction, and

the second sub-pixels and the first sub-pixel are aligned in the other one of the row direction and the column direction.

5. The display device according to claim 1 comprising a signal line coupled to each of the sub-pixels, wherein

a signal line of the first sub-pixel is arranged at a position overlapping a display region of the first sub-pixel.

6. The display device according to claim 1, wherein a distance between two signal lines respectively coupled to the two second sub-pixels is different from a distance between a signal line coupled to the first sub-pixel and one of the signal lines coupled to the second sub-pixels.

7. The display device according to claim 1, wherein the sub-pixels are aligned in one of the row direction and the column direction.

8. The display device according to claim 1 comprising a signal processing unit that performs signal processing for determining outputs of the pixels based on the input signal, wherein

in outputting a color that cannot be reproduced with sub-pixels included in one pixel, the signal processing unit produces an output using a sub-pixel that is included in another pixel and required for reproducing the color.

9. The display device according to claim 1 comprising a signal processing unit that performs signal processing for determining outputs of the pixels based on the input signal, wherein when the one pixel is assigned an input signal that requires a non-selected color that is a color other than colors of sub-pixels included in the one pixel, the signal processing unit produces an output using the other pixel including a sub-pixel including the non-selected color in an output of the one pixel.

10. The display device according to claim 1 comprising a signal processing unit that performs signal processing for determining outputs of the pixels based on the input signal, wherein when the one pixel is assigned an input signal that requires to output, with higher gradation, a specific color assigned to the second sub-pixel among the sub-pixels included in the one pixel, the signal processing unit produces an output using the other pixel including the sub-pixel including the specific color in an output of the one pixel.

11. A display device comprising a display unit including a color filter provided such that light of four or more predetermined number of colors is obtained, wherein

the display unit includes:

a plurality of partial regions that are arranged in a row direction and a column direction, and

a plurality of scanning lines each extending in the row direction, the scanning lines including a first scanning line and a second scanning line,

the partial regions each include;

a first display region that is largest and two or more second display regions each of which is smaller than the first display region,

a first switch element in the first display region,

a second switch element in one of the two or more second display regions,

a third switch element in another of the two or more second display regions, and

color filters corresponding to three or more colors the number of which is smaller than the predetermined number are arranged in each partial region,

the first switch element and the second switch element are coupled to the first scanning line,

the third switch element is coupled to the second scanning line, and

a color having the highest luminance among the predetermined number of colors is assigned to one of the second display regions.

12. The display device according to claim 11, wherein colors of light obtained from the first display region and the two or more second display regions configuring one partial region are different from each other.

13. The display device according to claim 11, wherein white has the highest luminance among the predetermined number of colors.

14. The display device according to claim 13, wherein a color filter corresponding to white is formed of a transparent resin layer.

15. The display device according to claim 13, wherein a resin layer as a color filter corresponding to white is not arranged.

16. The display device according to claim 11, wherein

the two or more second display regions are aligned in one of the row direction and the column direction, and

the second display regions and the first display region are aligned in the other one of the row direction and the column direction.

17. The display device according to claim 11 comprising a signal line coupled to each of the partial regions, wherein

a signal line of the first display region is arranged at a position overlapping the first display region.

18. The display device according to claim 11, wherein a distance between two signal lines respectively coupled to the two second display regions is different from a distance between a signal line coupled to the first display region and one of the signal lines coupled to the second display regions.

19. The display device according to claim 11, wherein the first display region and the second display regions are aligned in one of the row direction and the column direction.

20. The display device according to claim 11 comprising a signal processing unit that performs signal processing for determining outputs based on an input signal, wherein

in outputting a color that cannot be reproduced with one partial region, the signal processing unit produces an output using one of the first display region and the second display regions that are included in another partial region, the one display region being required for reproducing the color.