GAMMA VOLTAGE CORRECTION CIRCUIT, METHOD AND DISPLAY DEVICE

• US 20200135088A1
• Filed: 01/15/2019
• Published: 04/30/2020
• Est. Priority Date: 10/24/2018
• Status: Active Grant

• Current Assignee: HKC Corporation Limited (Shenzhen Huike Investment Holding Co., Ltd.)
• Original Assignee: HKC Corporation Limited (Shenzhen Huike Investment Holding Co., Ltd.)
• Inventors: Huang, Xiaoyu
• Granted Patent: US 10,861,377 B2
• Time in Patent Office: Days
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 3/30 using electroluminescent panels
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 3/3685 Details of drivers for data electrodes
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

Disclosed is a gamma voltage correction circuit, selecting a compensation voltage corresponding to a data-driven signal satisfying an equilibrium condition from multi-channel compensation voltages when determining that data-driven signals output by the output module could not satisfy the equilibrium condition of the picture lightness.

Claims

1. A gamma voltage correction circuit, comprising:

a plurality of source drivers, each of the source drivers includes a first voltage generating module, a first voltage compensation module, a multi-channel selector module, and an output module,

the first voltage generating module is configured to generate and output multi-channel reference voltages;

the first voltage compensation module is configured to generate and output multi-channel compensation voltages according to one channel of the reference voltages;

the multi-channel selector module is configured to output one channel of compensation voltages of the multi-channel compensation voltages;

the output module is configured to output a corresponding data-driven signal according to a compensation voltage output by the multi-channel selector module; and

a timing controller configured to control the multi-channel selector module to select a compensation voltage corresponding to a data-driven signal satisfying an equilibrium condition from the multi-channel compensation voltages and output it to the output module when determining the data-driven signals output by the output module could not satisfy the equilibrium condition of the picture lightness.

2. The gamma voltage correction circuit according to claim 1, wherein the timing controller is specifically configured to:

determine whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness;

control the multi-channel selector module of the corresponding source driver to select another channel of compensation voltages from the multi-channel compensation voltages as the current compensation voltage to output to the output module, and return to continue to determine whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness until the multi-channel selector module is controlled to select a compensation voltage corresponding to the data-driven signal satisfying the equilibrium condition from the multi-channel compensation voltages when determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness.

3. The gamma voltage correction circuit according to claim 2, wherein the determining whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness is specifically:

obtaining a data-driven signal output by two source drivers of the plurality of source drivers respectively, and calculating the difference between the obtained voltage values of the two data-driven signals; and

determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness when the voltage difference between the two data-driven signals is greater than the preset difference.

4. The gamma voltage correction circuit according to claim 1, wherein the timing controller is specifically configured to:

determine whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness;

determine a corresponding compensation voltage value, and control the multi-channel selector module of the corresponding source driver to select a compensation voltage matching the compensation voltage value from the multi-channel compensation voltage according to the compensation voltage value and output it to the output module when determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness.

5. The gamma voltage correction circuit according to claim 1, wherein the first voltage compensation module comprises a plurality of compensation resistors, and one end of the plurality of compensation resistors is connected to the first voltage generating module, and the other end of the plurality of compensation resistors is connected to the output ends of the multi-channel selector module one by one;

the resistance values of the plurality of compensation resistors are proportionally disposed.

6. The gamma voltage correction circuit according to claim 5, wherein the number of the compensation resistors is set to four.

7. The gamma voltage correction circuit according to claim 6, wherein the resistance value of any one of the four compensation resistors is 0 ohm.

8. The gamma voltage correction circuit according to claim 5, wherein each compensation voltage output by the first voltage compensation module is proportionally disposed.

14. A display device, comprising:

a display panel and a gamma voltage correction circuit of the display panel according to claim 1, a plurality of data lines of the display panel and a plurality of the source driver chips of the gamma voltage correction circuit are connected to each other respectively;

the gamma voltage correction circuit comprises;

a plurality of source drivers, each of the source drivers includes a first voltage generating module, a first voltage compensation module, a multi-channel selector module, and an output module,

the first voltage generating module is configured to generate and output multi-channel reference voltages;

the first voltage compensation module is configured to generate and output multi-channel compensation voltages according to one channel of the reference voltages;

the multi-channel selector module is configured to output one channel of compensation voltages of the multi-channel compensation voltages;

the output module is configured to output a corresponding data-driven signal according to a compensation voltage output by the multi-channel selector module; and

a timing controller configured to control the multi-channel selector module to select a compensation voltage corresponding to a data-driven signal satisfying an equilibrium condition from the multi-channel compensation voltages and output it to the output module when determining the data-driven signals output by the output module could not satisfy the equilibrium condition of the picture lightness.

15. The display device according to claim 14, wherein the timing controller is specifically configured to:

determine whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness; and

control the multi-channel selector module of the corresponding source driver to select another channel of compensation voltages from the multi-channel compensation voltages as the current compensation voltage to output to the output module, and return to continue to determine whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness until the multi-channel selector module is controlled to select a compensation voltage corresponding to the data-driven signal satisfying the equilibrium condition from the multi-channel compensation voltages when determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness.

16. The display device according to claim 15, wherein the determining whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness is specifically:

obtaining a data-driven signal output by two source drivers of the plurality of source drivers respectively, and calculating the difference between the obtained voltage values of the two data-driven signals; and

determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness when the voltage difference between the two data-driven signals is greater than the preset difference.

17. The display device according to claim 14, wherein the timing controller is specifically configured to:

determine whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness; and

determine a corresponding compensation voltage value, and control the multi-channel selector module of the corresponding source driver to select a compensation voltage matching the compensation voltage value from the multi-channel compensation voltage according to the compensation voltage value and output it to the output module when determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness.

18. The display device according to claim 14, wherein the first voltage compensation module comprises a plurality of compensation resistors, and one end of the plurality of compensation resistors is connected to the first voltage generating module, and the other end of the plurality of compensation resistors is connected to the output ends of the multi-channel selector module one by one;

the resistance values of the plurality of compensation resistors are proportionally disposed.

9. A gamma reference voltage correction method, comprising the steps of:

generating multi-channel reference voltages by a source driver;

generating multi-channel compensation voltages according to one channel of the reference voltages;

outputting one channel of compensation voltages of the multi-channel compensation voltages;

outputting a corresponding data-driven signal according to the compensation voltage; and

controlling, by the timing controller, a source driver to select a compensation voltage corresponding to a data-driven signal satisfying an equilibrium condition from the multi-channel compensation voltages and outputting the compensation voltage when determining that the data-driven signal could not satisfy the equilibrium condition of the picture lightness.

10. The gamma reference voltage correction method according to claim 9, wherein the step of controlling, by the timing controller, a source driver to select and output a compensation voltage corresponding to a data-driven signal satisfying an equilibrium condition from the multi-channel compensation voltages when determining that the data-driven signal could not satisfy the equilibrium condition of the picture lightness comprises:

determining, the timing controller, whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness;

and controlling the multi-channel selector module of the corresponding source driver to select one channel of compensation voltages from the multi-channel compensation voltages as the current compensation voltage to output to the output module of the source driver, and returning to continue to determine whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness until the multi-channel selector module is controlled to select the compensation voltage corresponding to the data-driven signal satisfying the equilibrium condition from the multi-channel compensation voltages when determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness.

11. The gamma reference voltage correction method according to claim 10, wherein the determining whether the data-driven signal output by the output module could satisfy the equilibrium condition of the picture lightness is specifically:

obtaining a data-driven signal output by adjacent two source drivers respectively, and comparing the two data-driven signals obtained; and

determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness when the voltage difference between the two data-driven signals is greater than the preset difference.

12. The gamma reference voltage correction method according to claim 9, wherein the step of controlling, by the timing controller, a source driver to select and output a compensation voltage corresponding to a data-driven signal satisfying an equilibrium condition from the multi-channel compensation voltages when determining that the data-driven signal could not satisfy the equilibrium condition of the picture lightness comprises:

determining whether the data-driven signal output by the output module of the source driver could satisfy the equilibrium condition of the picture lightness; and

determining a corresponding compensation voltage value, and control the multi-channel selector module of the corresponding source driver to select a compensation voltage matching the compensation voltage value from the multi-channel compensation voltage according to the compensation voltage value and output it to the output module when determining that the data-driven signal output by the output module could not satisfy the equilibrium condition of the picture lightness.

13. The gamma reference voltage correction method according to claim 9, wherein each compensation voltage is proportionally disposed.