Gamma correction circuit and gamma correction method

1. A gamma correction circuit, applied to a display device, comprising:

a first storage unit, configured to store a first gamma look-up table, wherein the first gamma look-up table is unassociated with display characteristics of the display device;

a second storage unit, configured to store a second gamma look-up table associated with said display characteristics of the display device;

a first correction circuit, configured to receive an input signal and to generate an intermediate signal corresponding to the input signal according to the first gamma look-up table; and

a second correction circuit, configured to receive the intermediate signal and to generate an output signal corresponding to the intermediate signal according to the second gamma look-up table,

wherein the first gamma look-up table is stored to the first storage unit after the display device is powered on.

2. The gamma correction circuit according to claim 1 , further comprising a third storage unit configured to store an equation, the gamma correction circuit generating the first gamma look-up table according to the equation.

3. The gamma correction circuit according to claim 1 , for generating the output signal corresponding to a gamma value N, wherein the first gamma look-up table corresponds to a gamma value K, the second gamma look-up table corresponds to a gamma value L, and N=K*L.

4. The gamma correction circuit according to claim 1 , wherein the first storage unit stores first alternative look-up tables, and the first correction circuit selects the first gamma look-up table from the first alternative look-up tables according to a first selection signal and accordingly generates the intermediate signal, the first alternative look-up tables each comprise different contents, when the first selection signal corresponds to a first target gamma value, the output signal has said first target gamma value, and when the first selection signal corresponds to a second target gamma value, the output signal has said second target gamma value.

5. The gamma correction circuit according to claim 4 , wherein the second storage unit stores second alternative look-up tables, and the second correction circuit selects the second gamma look-up table from the second alternative look-up tables according to a second selection signal and accordingly generates the output signal.

6. The gamma correction circuit according to claim 1 , wherein the first storage unit is implemented by a static random access memory (SRAM).

7. The gamma correction circuit according to claim 1 , wherein the second storage unit is implemented by an electrically-erasable programmable read-only memory (EEPROM).

8. A gamma correction method, applied to a display device, comprising:

generating a first gamma look-up table, unassociated with display characteristics of the display device;

storing said first gamma lookup table to a first storage unit;

receiving an input signal;

generating an intermediate signal corresponding to the input signal according to the first gamma look-up table; and

generating an output signal corresponding to the intermediate signal according to a second gamma look-up table associated with said display characteristics of the display device stored in a second storage unit.

9. The gamma correction method according to claim 8 , further comprising:

generating the first gamma look-up table according to an equation;

wherein, the equation is stored in a third storage unit.

10. The gamma correction method according to claim 8 , for generating the output signal corresponding to a gamma value N, wherein the first gamma look-up table corresponds to a gamma value K, the second gamma look-up table corresponds to a gamma value L, and N=K*L.

11. The gamma correction method according to claim 8 further comprising:

generating and storing first alternative look-up tables to the first storage unit;

wherein the step of generating the intermediate signal corresponding to the input signal according to the first gamma look-up table further comprises selecting the first gamma look-up table from the first alternative look-up tables according to a first selection signal and accordingly generating the intermediate signal;

wherein when the first selection signal corresponds to a first target gamma value, the output signal has said first target gamma value, and when the first selection signal corresponds to a second target gamma value, the output signal has said second target gamma value.

12. The gamma correction method according to claim 11 , the second storage unit storing second alternative look-up tables, the gamma correction method further comprising:

selecting the second gamma look-up table from the second alternative look-up tables and according to a second selection signal and accordingly generating the output signal.

13. The gamma correction method according to claim 8 , wherein the first storage unit is implemented by an SRAM.

14. The gamma correction method according to claim 8 , wherein the second storage unit is implemented by an EEPROM.

15. The gamma correction method of claim 8 , further comprising: installing a third memory preconfigured to perform said step of generating said first gamma look-up table in said display device, wherein said third memory is non-transitory; determining a grayscale-to-luminance display characteristic of said display device after installing said third memory; generating said second gamma table according to said grayscale-to-luminance display characteristic.

16. The gamma correction method of claim 15 , wherein said first memory is static random access memory, said second memory is electrically-erasable programmable read-only memory, and said third memory is read-only memory.

17. A gamma correction method, applied to a display device, comprising:

determining a gamma setting value;

determining a first gamma look-Lip table according to the gamma setting value;

performing gamma correction on the display device according to the first gamma look-up table and a second gamma look-up table associated with display characteristics of the display device;

wherein, the first gamma look-up table is unassociated with display characteristics of the display device.

18. The gamma correction method according to claim 17 , wherein the first gamma look-up table is stored to a first storage unit when the display device is powered on.

19. The gamma correction method according to claim 17 , wherein the first gamma look-up table is generated according to an equation.

20. The gamma correction method according to claim 17 , wherein the gamma setting value is N, the first gamma look-up table corresponds to a gamma value K, the second gamma look-up table corresponds to a gamma value L, and N=K*L.