Automatic luminance correction system, optical gray scale measurement device and automatic luminance correction method

1. An automatic luminance correction system, the automatic luminance correction system comprising:

a computing unit for computing correction parameters according to a luminance-gray scale linear equation;

a collecting unit for collecting the current luminance value; and

a correcting unit for calculating the target luminance value according to the correction parameter and the current luminance value;

wherein the correcting unit calculates the target luminance value based on the following equation: X=ix+j, wherein i is a first correction parameter, j is a second correction parameter, x is the current luminance value, X is the target luminance value; and the computing unit computes correction parameters according to the following luminance-gray scale linear equation: i=(d−c)/(f−e); j=(af+bc−ad−be)/(f−e), wherein a is a first luminance value, b is a second luminance value, c is a first standard gray scale value of the standard liquid crystal panel when the luminance value of the lamp is normal, d is a second standard gray scale value of the standard liquid crystal panel when the luminance value of the lamp is normal, e is a first attenuation gray scale value of the standard liquid crystal panel when the luminance value of the lamp attenuates, f is a second attenuation gray scale value of the standard liquid crystal panel when the luminance value of the lamp attenuates, the first standard gray scale value c and the first attenuation gray scale value e are corresponding to the first luminance value a, the second standard gray scale value d and the second attenuation gray scale value f are corresponding to the second luminance value b.

2. The automatic luminance correction system of claim 1 , wherein the automatic luminance correction system further comprising:

a gray scale obtaining unit for obtaining standard gray scale values of a standard liquid crystal panel when the luminance value of the lamp is normal and attenuation gray scale values of the standard liquid crystal panel when the luminance value of the lamp attenuates.

3. The automatic luminance correction system of claim 1 , wherein the first luminance value a and the second luminance value b are adapted to the luminance-gray scale linear equation, and the first luminance value a is smaller than the second luminance value b.

4. An automatic luminance correction method, the automatic luminance correction method comprising the steps of:

a computing step for computing correction parameters according to a luminance-gray scale linear equation;

a collecting step for collecting the current luminance value, wherein the correction parameters are computed according to the following luminance-gray scale linear equation: i=(d−c)/(f−e); j=(af+bc−ad−be)/(f−e), wherein a is a first luminance value, b is a second luminance value, c is a first standard gray scale value of the standard liquid crystal panel when the luminance value of the lamp is normal, d is a second standard gray scale value of the standard liquid crystal panel when the luminance value of the lamp is normal, e is a first attenuation gray scale value of the standard liquid crystal panel when the luminance value of the lamp attenuates, f is a second attenuation gray scale value of the standard liquid crystal panel when the luminance value of the lamp attenuates, the first standard gray scale value c and the first attenuation gray scale value e are corresponding to the first luminance value a, the second standard gray scale value d and the second attenuation gray scale value f are corresponding to the second luminance value b; and

a correcting step for calculating the target luminance value according to the correction parameter and the current luminance value, wherein the target luminance value is calculated based on the following equation: X=ix+j, wherein i is a first correction parameter, j is a second correction parameter, x is the current luminance value, X is the target luminance value.

5. The automatic luminance correction method of claim 4 , wherein the computing step comprises:

a gray scale obtaining step for obtaining standard gray scale values of a standard liquid crystal panel when the luminance value of the lamp is normal and attenuation gray scale values of the standard liquid crystal panel when the luminance value of the lamp attenuates.

6. The automatic luminance correction method of claim 4 , wherein the first luminance value a and the second luminance value b are adapted to the luminance-gray scale linear equation, and the first luminance value a is smaller than the second luminance value b.

7. An optical gray scale measurement device, the optical gray scale measurement device comprising an automatic luminance correction system, the automatic luminance correction system comprising:

a computing unit for computing correction parameters according to a luminance-gray scale linear equation, wherein the computing unit computes correction parameters according to the following luminance-gray scale linear equation: i=(d−c)/(f−e); j=(af+bc−ad−be)/(f−e), wherein a is a first luminance value, b is a second luminance value, c is a first standard gray scale value of the standard liquid crystal panel when the luminance value of the lamp is normal, d is a second standard gray scale value of the standard liquid crystal panel when the luminance value of the lamp is normal, e is a first attenuation gray scale value of the standard liquid crystal panel when the luminance value of the lamp attenuates, f is a second attenuation gray scale value of the standard liquid crystal panel when the luminance value of the lamp attenuates, the first standard gray scale value c and the first attenuation gray scale value e are corresponding to the first luminance value a, the second standard gray scale value d and the second attenuation gray scale value f are corresponding to the second luminance value b;

a collecting unit for collecting the current luminance value; and

a correcting unit for calculating the target luminance value according to the correction parameter and the current luminance value, wherein the correcting unit calculates the target luminance value based on the following equation: X=ix+j, wherein i is a first correction parameter, j is a second correction parameter, x is the current luminance value, X is the target luminance value.

8. The optical gray scale measurement device of claim 7 , wherein the automatic luminance correction system further comprising:

a gray scale obtaining unit for obtaining standard gray scale values of a standard liquid crystal panel when the luminance value of the lamp is normal and attenuation gray scale values of the standard liquid crystal panel when the luminance value of the lamp attenuates.

9. The optical gray scale measurement device of claim 7 , wherein the first luminance value a and the second luminance value b are adapted to the luminance-gray scale linear equation, and the first luminance value a is smaller than the second luminance value b.

10. The automatic luminance correction system of claim 1 , wherein the computing unit determines whether a difference between the first standard gray scale value c and the first attenuation gray scale value e is greater than a predetermined value and a difference between the second standard gray scale value d and the second attenuation gray scale value f is greater than a predetermined value.

11. The automatic luminance correction system of claim 10 , wherein when the difference between the first standard gray scale value c and the first attenuation gray scale value e is greater than the predetermined value or the difference between the second standard gray scale value d and the second attenuation gray scale value f is greater than the predetermined value, an alarm is activated.