Method of compensating for an output of a data driver

Patent metadata

Field	Value
Publication number	US-12380862-B2
Application number	US-202318501234-A
Country	US
Kind code	B2
Filing date	Nov 3, 2023
Priority date	Nov 22, 2022
Publication date	Aug 5, 2025
Grant date	Aug 5, 2025

Abstract

A method of compensating for an output of a data driver of a display device includes measuring a first output value of a sensing circuit that senses pixels by applying an external voltage to the sensing circuit, measuring second output values of the sensing circuit by applying output voltages within an output range of the data driver to the sensing circuit through output amplifiers of the data driver, generating a compensation look-up table based on the first output value and the second output values, and compensating for the output voltages of the data driver based on the compensation look-up table.

First claim

What is claimed is:

1. A method of compensating for an output of a data driver of a display device, the method comprising:
measuring a first output value of a sensing circuit that senses pixels by applying an external voltage to the sensing circuit;
measuring second output values of the sensing circuit by applying output voltages within an output range of the data driver to the sensing circuit through output amplifiers of the data driver;
generating a compensation look-up table based on the first output value and the second output values; and
compensating for the output voltages of the data driver based on the compensation look-up table.

2. The method of claim 1 , wherein the compensation look-up table is generated based on differences between the first output value and the second output values.

3. The method of claim 1 , wherein the data driver outputs gray level voltages as the output voltages.

4. The method of claim 3 , wherein the measuring of the second output values includes:
measuring the second output values for a first color by applying the gray level voltages for the first color to the sensing circuit through the output amplifiers for the first color;
measuring the second output values for a second color by applying the gray level voltages for the second color to the sensing circuit through the output amplifiers for the second color; and
measuring the second output values for a third color by applying the gray level voltages for the third color to the sensing circuit through the output amplifiers for the third color.

5. The method of claim 4 , wherein
a number of the output amplifiers for the first color is equal to a horizontal resolution of a display panel,
a number of the output amplifiers for the second color is equal to the horizontal resolution of the display panel,
a number of the output amplifiers for the third color is equal to the horizontal resolution of the display panel,
a number of the second output values for the first color is equal to a number of gray levels multiplied by the horizontal resolution,
a number of the second output values for the second color is equal to the number of gray levels multiplied by the horizontal resolution, and
a number of the second output values for the third color is equal to the number of the gray levels multiplied by the horizontal resolution.

6. The method of claim 5 , wherein
the compensation look-up table includes compensation values,
a number of the compensation values for the first color is equal to the number of the gray levels multiplied by the horizontal resolution multiplied by a vertical resolution of the display panel,
a number of the compensation values for the second color is equal to the number of the gray levels multiplied by the horizontal resolution multiplied by the vertical resolution of the display panel, and
a number of the compensation values for the third color is equal to the number of the gray levels multiplied by the horizontal resolution multiplied by the vertical resolution of the display panel.

7. The method of claim 1 , wherein
the measuring of the second output values includes:
repeatedly applying the output voltages, which are equal to each other, to the sensing circuit through the output amplifiers; and
calculating average values of the second output values for the output voltages, which are equal to each other, and

the compensation look-up table is generated based on the average values.

8. A method of compensating for an output of a data driver of a display device, the method comprising:
measuring a first output value of a sensing circuit that senses pixels by applying an external voltage to the sensing circuit;
measuring second output values of the sensing circuit by applying output voltages within an output range of the data driver to the sensing circuit through output amplifiers of the data driver;
generating a compensation look-up table based on the first output value and the second output values; and
compensating for the output voltages of the data driver based on the compensation look-up table,
wherein the compensation look-up table includes compensation values for compensating for deviations of the output amplifiers for differences between the first output value and the second output values.

9. The method of claim 8 , wherein the output voltages are compensated for by adding the compensation values to the output voltages.

10. The method of claim 1 , wherein
the data driver outputs gray level voltages as the output voltages,
the compensation look-up table includes compensation values, and
the compensation values for the gray level voltages corresponding to a reference gray level or less are about 0.

11. The method of claim 1 , wherein
the data driver outputs gray level voltages as the output voltages,
the compensation look-up table includes compensation values, and
the compensation values for the gray level voltages corresponding to a reference gray level or more are about 0.

12. The method of claim 1 , wherein the data driver includes a DC-DC converter that determines the output voltages of the data driver based on a voltage control signal.

13. The method of claim 1 , wherein the sensing circuit includes:
a sensing line initialization circuit that initializes a sensing line;
a line selection switch that electrically connects the sensing line to a sensing channel; and
the sensing channel that samples a sensing voltage of the sensing line.

14. The method of claim 13 , wherein the second output values are measured by applying the output voltages to the sensing channel.

15. The method of claim 14 , wherein the sensing circuit further includes:
an analog-to-digital converter; and
a switch matrix that electrically connects the sensing channel to the analog-to-digital converter.

16. A method of compensating for an output of a data driver of a display device, the method comprising:
measuring a first output value of a sensing circuit that senses pixels by applying an external voltage to the sensing circuit;
measuring second output values of the sensing circuit by applying output voltages within an output range of the data driver to the sensing circuit through a first portion of output amplifiers of the data driver;
measuring the second output values of the sensing circuit by applying the output voltages to the sensing circuit through a second portion of the output amplifiers;
generating a compensation look-up table based on the first output value and the second output values; and
compensating for the output voltages of the data driver based on the compensation look-up table.

17. The method of claim 16 , wherein the compensation look-up table is generated based on differences between the first output value and the second output values.

18. The method of claim 16 , wherein the sensing circuit includes:
a sensing line initialization circuit that simultaneously initializes a first sensing line and a second sensing line;
a first line selection switch that electrically connects the first sensing line to a sensing channel;
a second line selection switch that electrically connects the second sensing line to the sensing channel; and
the sensing channel that samples a first sensing voltage of the first sensing line and samples a second sensing voltage of the second sensing line.

19. The method of claim 18 , wherein the second output values are measured by applying the output voltages to the sensing channel.

20. The method of claim 19 , wherein the sensing circuit

Assignees

• Samsung Display Co Ltd

Inventors

• Jung Hayong

Classifications

• G09G5/028

  Circuits for converting colour display signals into monochrome display signals · CPC title

• G09G2320/0666

  for control of colour parameters, e.g. colour temperature · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• G09G2310/027

  Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters · CPC title

• G09G2310/0291

  Details of output amplifiers or buffers arranged for use in a driving circuit · CPC title