Driving controller, display apparatus including the same and method of driving display panel using the same

Patent metadata

Field	Value
Publication number	US-11170691-B2
Application number	US-202117149610-A
Country	US
Kind code	B2
Filing date	Jan 14, 2021
Priority date	Apr 13, 2020
Publication date	Nov 9, 2021
Grant date	Nov 9, 2021

Abstract

A driving controller set includes a net power control setter, a data clamper, a data line, and a data driver. The net power control setter may determine a first scale factor for adjusting a grayscale value of (N+1)-th frame data based on a load of N-th frame data and a net power control reference value. N is an integer equal to or greater than two. The data clamper may determine a second scale factor for adjusting a grayscale value of the N-th frame data based on a load of (N−1)-th frame data and the N-th frame data. A data signal may be generated using the first scale factor and/or the second scale factor. The data line may include a conductive material. The data driver may convert the data signal into a data voltage and may output the data voltage to the data line.

First claim

What is claimed is:

1. A driving controller set comprising:
a net power control setter configured to determine a first scale factor for adjusting a grayscale value of (N+1)-th frame data based on a load of N-th frame data and a net power control reference value, wherein N is an integer equal to or greater than two;
a data clamper configured to determine a second scale factor for adjusting a grayscale value of the N-th frame data based on a load of (N−1)-th frame data and the N-th frame data, wherein a data signal is generated using at least one of the first scale factor and the second scale factor;
a data line formed of at least one conductive material; and
a data driver electrically connected to each of the net power control setter, the data clamper, and the data line, configured to convert the data signal into a data voltage, and configured to output the data voltage to the data line.

2. The driving controller set of claim 1 , wherein the data clamper is activated when the (N−1)-th frame data is different from the N-th frame data, and
wherein the data clamper is deactivated when the (N−1)-th frame data is same as the N-th frame data.

3. The driving controller set of claim 1 , wherein the data clamper is configured to receive the load of the (N−1)-th frame data, a net power control signal of an (N−1)-th frame, and the N-th frame data.

4. The driving controller set of claim 3 , wherein when the net power control signal of the (N−1)-th frame is inactive, the second scale factor gradually decreases as the load of the (N−1)-th frame data increases from 0% to the net power control reference value.

5. The driving controller set of claim 4 , wherein when the net power control signal of the (N−1)-th frame is active, the second scale factor gradually decreases as the load of the (N−1)-th frame data increases from the net power control reference value to 100%.

6. The driving controller set of claim 1 , wherein when the net power control signal of the (N−1)-th frame is inactive, the second scale factor is fixed regardless of the load of the (N−1)-th frame data.

7. The driving controller set of claim 6 , wherein when the net power control signal of the (N−1)-th frame is active, the second scale factor is fixed regardless of the load of the (N−1)-th frame data.

8. The driving controller set of claim 1 , further comprising a load sum calculator configured to receive the N-th frame data and to calculate a sum of total grayscale values of the N-th frame data.

9. The driving controller set of claim 8 , further comprising a load calculator configured to receive the sum of the total grayscale values of the N-th frame data and to calculate the load of the N-th frame data.

10. The driving controller set of claim 9 , wherein the data clamper is configured to receive the load of the N-th frame data from the load calculator.

11. The driving controller set of claim 1 , wherein a final scale factor of the (N+1)-th frame data is determined by multiplying the first scale factor and the second scale factor.

12. A display apparatus comprising:
a display panel comprising a data line and a pixel electrically connected to the data line, wherein the data line is formed of at least one conductive material;
a driving controller comprising a net power control setter and a data clamper, wherein the net power control setter is configured to determine a first scale factor for adjusting a grayscale value of (N+1)-th frame data based on a load of N-th frame data and a net power control reference value, wherein the data damper is configured to determine a second scale factor for adjusting a grayscale value of the N-th frame data based on a load of (N−1)-th frame data and the N-th frame data, wherein N is an integer equal to or greater than two, and wherein the driving controller is configured to generate a data signal based on at least one of the first scale factor and the second scale factor; and
a data driver electrically connected to each of the driving controller and the display panel, configured to convert the data signal into a data voltage, and configured to output the data voltage through the data line to the pixel to control luminance of the pixel.

13. The display apparatus of claim 12 , wherein the data clamper is activated when the (N−1)-th frame data is different from the N-th frame data, and
wherein the data clamper is deactivated when the (N−1)-th frame data is same as the N-th frame data.

14. The display apparatus of claim 12 , wherein the data clamper is configured to receive the load of the (N−1)-th frame data, a net power control signal of an (N−1)-th frame, and the N-th frame data.

15. The display apparatus of claim 12 , wherein the driving controller further comprises a load sum calculator configured to receive the N-th frame data and to calculate a sum of total grayscale values of the N-th frame data.

16. The display apparatus of claim 15 , wherein the driving controller further comprises a load calculator configured to receive the sum of the total gray scale values of the N-th frame data and to calculate the load of the N-th frame data.

17. The display apparatus of claim 16 , wherein the data clamper is configured to receive the load of the N-th frame data from the load calculator.

18. A method of driving a display panel, the method comprising:
determining a first scale factor for adjusting a grayscale value of (N+1)-th frame data based on a load of N-th frame data and a net power control reference value;
determining a second scale factor for adjusting a grayscale value of the N-th frame data based on a load of (N−1)-th frame data and the N-th frame data;
generating a data signal using at least one of the first scale factor and the second scale factor;
converting the data signal into a data voltage; and
outputting the data voltage through a data line to a pixel of the display panel to control luminance of the pixel,
wherein N is an integer equal to or greater than two.

19. The method of claim 18 , wherein the second scale factor is generated when the (N−1)-th frame data is different from the N-th frame data, and
wherein the second scale factor is not generated when the (N−1)-th frame data is same as the N-th frame data.

20. The method of claim 18 , further comprising determining a final scale factor of the (N+1)-th frame data by multiplying the first scale factor and the second scale factor.

Assignees

• Samsung Display Co Ltd

Inventors

• Pyun Kihyun
• Seo Wonjin
• Choi Eunjin

Classifications

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title

• G09G3/3406 Primary

  Control of illumination source (illumination devices structurally associated with liquid crystal cells G02F1/1336) · CPC title

• G09G2310/0275

  Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current · CPC title