Method of correcting gamma and display device employing the same

Patent metadata

Field	Value
Publication number	US-12374256-B2
Application number	US-202217861644-A
Country	US
Kind code	B2
Filing date	Jul 11, 2022
Priority date	Sep 6, 2021
Publication date	Jul 29, 2025
Grant date	Jul 29, 2025

Abstract

A method of correcting gamma includes generating a representative panel model by performing a deep learning based on luminance factors and a representative display panel, generating a panel model by performing a transfer learning based on the representative panel model and a display panel, and determining a grayscale voltage for the display panel based on the panel model.

First claim

What is claimed is:

1. A method of correcting gamma of a display panel, the method comprising:
generating a representative panel model by performing a deep learning based on luminance factors and a representative display panel, which is manufactured prior to manufacturing the display panel;
generating a panel model by performing a transfer learning based on the representative panel model and the display panel; and
determining a grayscale voltage for the display panel based on the panel model,
wherein the representative panel model is a pre-learning model generated based on the representative display panel in a specific environment, and
wherein the transfer learning trains an artificial neural network to generate the panel model in another environment by reusing a part of a hidden layer of the pre-learning model generated in the specific environment and employing at least one selected from weights of the pre-learning model generated in the specific environment as it is.

2. The method of claim 1 , wherein
the luminance factors include a grayscale level, and
the luminance factors further include at least one selected from a frame frequency, an on-duty ratio, a power supply voltage, and an initialization voltage.

3. The method of claim 1 , further comprising:
storing information on the grayscale voltage.

4. The method of claim 1 , further comprising:
determining tuning points of luminance and color coordinate based on the luminance factors;
determining a target luminance and a target color coordinate at each of the tuning points; and
measuring a first test voltage applied to pixels included in the representative display panel corresponding to the target luminance and the target color coordinate at the tuning points,
wherein the deep learning is performed based on the tuning points, the target luminance, the target color coordinate, and the first test voltage.

5. The method of claim 4 , wherein
the deep learning uses the tuning points, the target luminance, and the target color coordinate as input values, and
the deep learning uses the first test voltage as a target value.

6. The method of claim 4 , wherein determining the tuning points includes:
determining reference values of the respective luminance factors; and
determining the tuning points based on the reference values.

7. The method of claim 6 , wherein a number of the tuning points is a product of respective numbers of the reference values of the respective luminance factors.

8. The method of claim 4 , further comprising:
measuring a second test voltage applied to pixels included in the display panel corresponding to the target luminance and the target color coordinate at a some of the tuning points,
wherein the transfer learning is performed based on the some of the tuning points, the target luminance at the some of the tuning points, the target color coordinate at the some of the tuning points, the second test voltage, and the representative panel model.

9. The method of claim 1 , wherein
the panel model is generated in a cell process, and
the representative panel model is generated before the cell process.

10. A method of correcting gamma of a display panel, the method comprising:
generating a representative panel model by performing a deep learning based on luminance factors and a representative display panel, which is manufactured prior to manufacturing the display panel;
generating a panel model by performing a transfer learning based on the representative panel model and the display panel;
storing weights of the panel model;
generating a re-implemented panel model by re-implementing the panel model based on the weights of the panel model; and
determining a grayscale voltage for the display panel based on the re-implemented panel model,
wherein the representative panel model is a pre-learning model generated based on the representative display panel in a specific environment, and
wherein the transfer learning trains an artificial neural network to generate the panel model in another environment by reusing a part of a hidden layer of the pre-learning model generated in the specific environment and employing at least one selected from weights of the pre-learning model generated in the specific environment as it is.

11. The method of claim 10 , wherein
the luminance factors include a grayscale level, and
the luminance factors further include at least one selected from a frame frequency, an on-duty ratio, a power supply voltage, and an initialization voltage.

12. The method of claim 10 , further comprising:
determining tuning points of luminance and color coordinate based on the luminance factors;
determining a target luminance and a target color coordinate at each of the tuning points; and
measuring a first test voltage applied to pixels included in the representative display panel corresponding to the target luminance and the target color coordinate at the tuning points,
wherein the deep learning is performed based on the tuning points, the target luminance, the target color coordinate, and the first test voltage.

13. The method of claim 12 , wherein
the deep learning uses the tuning points, the target luminance, and the target color coordinate as input values, and
the deep learning uses the first test voltage as a target value.

14. The method of claim 12 , wherein determining the tuning points includes:
determining reference values of the respective luminance factors; and
determining the tuning points based on the reference values.

15. The method of claim 12 , wherein a number of the tuning points is a product of respective numbers of the reference values of the respective luminance factors.

16. The method of claim 12 , further comprising:
measuring a second test voltage applied to pixels included in the display panel corresponding to the target luminance and the target color coordinate at some of the tuning points,
wherein the transfer learning is performed based on the some of the tuning points, the target luminance at the some of the tuning points, the target color coordinate at the some of the tuning points, the second test voltage, and the representative panel model.

17. The method of claim 10 , wherein
the panel model is generated in a cell process, and
the representative panel model is generated before the cell process.

18. The method of claim 17 , wherein the re-implemented panel model is generated during driving of the display panel.

19. A display device comprising:
a display panel including pixels;
a gate driver which applies gate signals to the pixels;
a data driver which applies data voltages to the pixels;
a driving controller which controls the gate driver and the data driver; and
a memory device which stores weights of a panel model,
wherein the driving controller receives the weights of the panel model from the memory device, generates a re-implemented panel model by re-implementing the panel model based on the weights of the panel model, and determines a grayscale voltage for the display panel based on the re-implemented panel model,
wherein the panel model is a model generated by performing a transfer learning in a cell process to match a representative panel model to characteristics of the display panel,
wherein the representative panel model is a pre-learning model generated based on a representative display panel, which is manufactured prior to manufacturing the display panel, in a specific environment,
wherein the transfer learning trains an artificial neural network to gener

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Kanghee
• Kim Hyeonmin
• Lee Jungyu

Classifications

• G09G2320/0276

  for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2320/0666

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

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title