Display apparatus

• US 10,115,358 B2
• Filed: 06/22/2015
• Issued: 10/30/2018
• Est. Priority Date: 07/31/2014
• Status: Active Grant

• Current Assignee: TCL China Star Optoelectronics Technology Co. Ltd. (TCL Technology Group Corp.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Lee, Junpyo, Seo, Joo Hong, Jeon, ByungKil
• Primary Examiner(s): Dharia, Prabodh M
• Application Number:
  US14/745,811
• Publication Number:
  US 20160035292A1
• Time in Patent Office: 1,226 Days
• Field of Search: 345 82, 345 87, 345103, 345690-695, 349 56, 349141, 349109
• CPC Class Codes: G09G 2300/0443 with several sub-pixels for the same colour in a pixel, not specifically used to display gradations G09G3/364 takes precedence
• 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 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2340/06 Colour space transformation
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display apparatus includes a plurality of primary color pixels and a plurality of white pixels. The white pixels include a first white pixel to receive a first white pixel signal generated based on a first gamma curve and a second white pixel to receive a second white pixel signal generated based on a second gamma curve.

Claims

1. A display apparatus, comprising:

a plurality of primary color pixels; and

a plurality of white pixels including a plurality of first white pixels to receive first white pixel signals generated based on a first gamma curve and a plurality of second white pixels to receive second white pixel signals generated based on a second gamma curve, wherein the primary color pixels and the white pixels have different arrangements in different pixel groups, wherein the first white pixels are high voltage pixels and the second white pixels are low voltage pixels, and wherein the first white pixels and second white pixels are in different columns.

2. The display apparatus as claimed in claim 1, wherein the first and second gamma curves have different brightness values with respect to a same gray-scale.

3. The display apparatus as claimed in claim 2, wherein the different pixel groups include a first pixel group to include the first white pixel and a second pixel group to include the second white pixel, and the first and second pixel groups are adjacent to each other.

4. The display apparatus as claimed in claim 3, wherein:

the primary color pixels include red, green, and blue pixels to respectively display red, green, and blue colors, and

each of the first and second pixel groups further includes the red, green, and blue pixels.

5. The display apparatus as claimed in claim 4, wherein:

a first pixel of the first pixel group and a second pixel of the second pixel group display a same color among the red, green, and blue colors,

one pixel of the first or second pixels receives a high signal generated based on the first gamma curve, and

the other pixel of the first or second pixels receives a low signal generated based on the second gamma curve.

6. The display apparatus as claimed in claim 5, wherein:

the pixel groups are arranged in a row direction and a column direction, and

the first and second pixel groups are alternately arranged with each other in each pixel row.

7. The display apparatus as claimed in claim 5, wherein:

each pixel row includes a first sub-pixel row and a second sub-pixel row, and

the first and second pixels are arranged in different sub-pixel rows of the first and second sub-pixel rows.

8. The display apparatus as claimed in claim 7, wherein:

a plurality of first pixel are provided, each of the first pixels arranged in the first sub-pixel row, and

a plurality of second pixels are provided and arranged in the second sub-pixel row.

9. The display apparatus as claimed in claim 8, wherein the first pixels include first positive pixels having a positive polarity and first negative pixels having a negative polarity, and the second pixels include second positive pixels having the positive polarity and second negative pixels having the negative polarity.

10. The display apparatus as claimed in claim 9, wherein:

a number of the first positive pixels is equal to a number of the first negative pixels in the first sub-pixel row, and

a number of the second positive pixels is equal to a number of the second negative pixels in the second sub-pixel row.

11. The display apparatus as claimed in claim 7, further comprising:

a plurality of gate lines extending in the row direction; and

a plurality of data lines extending in the column direction, wherein the pixels of the first sub-pixel row are connected to a k-th gate line among the gate lines and the pixels of the second sub-pixel row are connected to a (k+1)th gate line among the gate lines.

12. The display apparatus as claimed in claim 11, wherein the pixels in a j-th column disposed between an i-th data line and an (i+1)th data line among the data lines are arranged in the column direction, and the pixels in the j-th column are connected to one of the i-th data line and the (i+1)th data line.

13. The display apparatus as claimed in claim 12, wherein, among the pixels arranged in the j-th column, the pixels arranged in the first sub-pixel row are connected to the i-th data line and the pixels arranged in the second sub-pixel row are connected to the (i+1)th data line.

14. The display apparatus as claimed in claim 11, wherein all the pixels in the j-th column are connected to the i-th data line.

15. The display apparatus as claimed in claim 11, wherein a polarity of the pixel signal applied to the data lines is inverted every four data lines.

16. The display apparatus as claimed in claim 4, wherein:

at least one pixel of the red, green, or blue pixels of the first pixel group has a gamma characteristic corresponding to the first gamma curve,

other pixels of the red, green, or blue pixels of the first pixel group have a gamma characteristic corresponding to the second gamma curve,

at least one pixel of the red, green, or blue pixels of the second pixel group has the gamma characteristic corresponding to the second gamma curve, and

other pixels of the red, green, or blue pixels of the second pixel group have the gamma characteristic corresponding to the first gamma curve.

17. The display apparatus as claimed in claim 16, wherein the first and second gamma curves have different brightness values from each other with respect to the same gray-scale.

18. The display apparatus as claimed in claim 4, wherein each of the primary color pixels and each of the white pixels are divided into a high gray-scale area and a low gray-scale area.

19. The display apparatus as claimed in claim 18, wherein:

the high gray-scale area has the gamma characteristic corresponding to the first gamma curve and the low gray-scale area has the gamma characteristic corresponding to a third gamma curve having a brightness value lower than the first gamma curve with respect to the same gray-scale in the pixel applied with the pixel signal based on the first gamma curve among the primary color pixels and the white pixels, and

the high gray-scale area has the gamma characteristic corresponding to the second gamma curve and the low gray-scale area has the gamma characteristic corresponding to a fourth gamma curve having a brightness value lower than the second gamma curve with respect to the same gray-scale in the pixel applied with the pixel signal based on the second gamma curve among the primary color pixels and the white pixels.

20. The display apparatus as claimed in claim 4, wherein the first and second pixel groups are alternately arranged in a row direction and a column direction and disposed adjacent to each other.

21. The display apparatus as claimed in claim 20, wherein:

a first pixel of the first pixel group and a second pixel of the second pixel group display a same color of the red, green, or blue colors,

one pixel of the first or second pixels receives a high signal generated based on the first gamma curve, and

the other pixel of the first or second pixels receives a low signal generated on the basis of the second gamma curve.

22. The display apparatus as claimed in claim 21, wherein the first and second pixels are alternately arranged in the unit of pixel along the same pixel row and the same pixel column.

23. A display apparatus, comprising:

a timing controller to receive an input image data, convert the input image data to a primary color data and a white data, and convert the white data to first and second white pixel data on the basis of first and second gamma curves;

a driver to convert the first and second white pixel data to first and second white pixel voltages; and

a display panel including primary color pixels and white pixels, the white pixels including a plurality of first white pixels applied with the first white pixel voltage and a second white pixel applied with the second white pixel voltage, the first white pixel voltage being a high white pixel voltage and the second white pixel voltage being a low white pixel voltage, wherein the primary color pixels and the white pixels have different arrangements in different pixel groups, and wherein the first white pixels and second white pixels are in different columns.

24. The display apparatus as claimed in claim 23, further comprising:

a first look-up table to store a first sampling data sampled from the first gamma curve; and

a second look-up table to store a second sampling data sampled from the second gamma curve.

25. The display apparatus as claimed in claim 24, wherein:

the primary color data includes red, green, and blue color data, and

the timing controller is to convert each of the red, green, and blue color data to a high pixel data and a low pixel data with reference to the first and second look-up tables.

26. The display apparatus as claimed in claim 23, wherein:

the first gamma curve has a brightness value higher than a reference gamma curve with respect to a same gray-scale, and

the second gamma curve has a brightness value lower than the reference gamma curve with respect to the same gray-scale.

27. The display apparatus as claimed in claim 26, wherein:

the first gamma curve includes first and second sub-gamma curves having different brightness values with respect to the same gray-scale,

the second gamma curve includes third and fourth sub-gamma curves having different brightness values with respect to the same gray-scale,

the primary color data is converted to a first primary pixel data based on the first sub-gamma curve,

the white color data is converted to the first white pixel data based on the second sub-gamma curve,

the primary color data is converted to a second primary pixel data based on the third sub-gamma curve, and

the white color data is converted to the second white pixel data based on the fourth sub-gamma curve.

28. The display apparatus as claimed in claim 23, wherein:

the primary color pixels and the white pixels form pixel groups,

the pixel groups include a first pixel group and a second pixel group,

the first pixel group includes the first white pixel,

the second pixel group includes the second white pixel, and

the first and second pixel groups are adjacent to each other.