Driving method of liquid crystal display device having dynamic backlight control unit
A dynamic control method for controlling backlight module of liquid crystal display (LCD) comprises steps of: receiving a frame data which is transferred to the LCD and consists a plurality of raw grayscale level; processing a statistical analysis for distribution of the plurality of raw grayscale level; and transferring a plurality of corrected grayscale level which is resulted from the statistical analysis corresponding to the raw grayscale level to the backlight control unit and a data modification simultaneously, wherein the backlight control unit uses the plurality of corrected grayscale level to modify brightness of backlight module and the data modification uses the plurality of corrected grayscale level to compare with the plurality of raw grayscale level for accurate display performance, so that the electrical power consumption is reduced and image quality is enhanced.
1. A dynamic control method for controlling a backlight module of a liquid crystal display (LCD), wherein the backlight of the LCD is provided by a plurality of light sources of a backlight module and controlled by a backlight control unit, comprising the following steps:
receiving a frame data which is transferred to the LCD and consists of a plurality of raw grayscale level;
processing a statistical analysis for distribution of the plurality of raw grayscale level; and
transferring a plurality of corrected grayscale level which results from the statistical analysis corresponding to the raw grayscale level to the backlight control unit and a data modification simultaneously, wherein a relationship between the corrected grayscale level and the raw grayscale level follows a formula:
Corrected
grayscale
level
=
Raw
grayscale
level
×
Maximum
of
corrected
grayscale
level
Maximum
of
raw
grayscale
level
,
and the backlight control unit uses the plurality of corrected grayscale level to modify brightness of the backlight module and the data modification uses the plurality of corrected grayscale level to compare with the plurality of raw grayscale level for accurate display performance.
2. A dynamic control method for controlling a backlight module of an LCD according to claim 1 , wherein a weighted-average of the raw grayscale level is calculated in the step of processing statistical analysis for uses of further analysis and determinant conditions.
3. A dynamic control method for controlling a backlight module of an LCD according to claim 1 , wherein the bits of raw grayscale level can be truncated and represented as most significant bit (MSB) through a manner of bit truncation for reducing data process during the step of processing statistical analysis.
4. A dynamic control method for controlling a backlight module of an LCD according to claim 1 , wherein all the brightness of light source of the backlight module can be changed by the same amount for whole brightness modification.
5. A dynamic control method for controlling a backlight module of an LCD according to claim 1 , wherein the brightness of light source of backlight module on the same strip board can be changed by the same amount for strip-wise brightness modification.
6. A dynamic control method for controlling a backlight module of an LCD according to claim 1 , wherein the brightness of light source of backlight module on the same area board can be changed by the same amount for area-wise brightness modification.
7. A dynamic control method for controlling a backlight module of an LCD according to claim 1 , wherein a lower limit of grayscale level replaces the maximum of raw grayscale level when the maximum value of raw grayscale level is less than the lower limit of grayscale level.
8. A dynamic control method for controlling a backlight module of an LCD according to claim 1 , wherein the raw grayscale level and the corrected grayscale level are variables of (X, Y) Cartesian coordinate respectively and the relationship between them is a curve through (0, 0) and (maximum of raw grayscale level, maximum of corrected grayscale level) on (X, Y) Cartesian coordinate.
9. A dynamic control method for controlling a backlight module of an LCD according to claim 8 , wherein a lower limit of grayscale level replaces the maximum of raw grayscale level when the maximum value of raw grayscale level is less than the lower limit of grayscale level.
10. A dynamic control method for controlling a backlight module of an LCD according to claim 1 , wherein a plurality of optimized grayscale level is transferred to a timing controller which sends the plurality of optimized grayscale level and a control signal to the LCD panel for brightness control after comparison between the raw grayscale level and the corrected grayscale level in order to optimize image performance.
11. A dynamic control method for controlling a backlight module of a liquid crystal display (LCD), wherein backlight of the LCD is provided by a plurality of light sources of the backlight module and controlled by a backlight control unit, comprising the following steps:
receiving a frame data which is transferred to the LCD and consists of a plurality of raw grayscale level;
processing a statistical analysis for distribution of the plurality of raw grayscale level; and
transferring a plurality of corrected grayscale level which results from the statistical analysis corresponding to the raw grayscale level to the backlight control unit, wherein a relationship between the corrected grayscale level and the raw grayscale level follows a formula:
Corrected
grayscale
level
=
Raw
grayscale
level
×
Maximum
of
corrected
grayscale
level
Maximum
of
raw
grayscale
level
,
and the backlight control unit uses the plurality of corrected grayscale level to modify brightness of the backlight module.
12. A dynamic control method for controlling a backlight module of an LCD according to claim 11 , wherein a weighted-average of the raw grayscale level is calculated in the step of processing statistical analysis for uses of further analysis and determinant conditions.
13. A dynamic control method for controlling a backlight module of an LCD according to claim 11 , wherein the bits of raw grayscale level can be truncated and represented as most significant bit (MSB) through a manner of bit truncation for reducing data process during the step of processing statistical analysis.
14. A dynamic control method for controlling a backlight module of an LCD according to claim 11 , wherein all the brightness of light source of the backlight module can be changed by the same amount for whole brightness modification.
15. A dynamic control method for controlling a backlight module of an LCD according to claim 11 , wherein the brightness of light source of backlight module on the same strip board can be changed by the same amount for strip-wise brightness modification.
16. A dynamic control method for controlling a backlight module of an LCD according to claim 11 , wherein the brightness of light source of backlight module on the same area board can be changed by the same amount for area-wise brightness modification.
17. A dynamic control method for controlling a backlight module of an LCD according to claim 11 , wherein a lower limit of grayscale level replaces the maximum of raw grayscale level when the maximum value of raw grayscale level is less than the lower limit of grayscale level.
18. A dynamic control method for controlling a backlight module of an LCD according to claim 11 , wherein the raw grayscale level and the corrected grayscale level are variables of (X, Y) Cartesian coordinate respectively and the relationship between them is a curve through (0, 0) and (maximum of raw grayscale level, maximum of corrected grayscale level) on (X, Y) Cartesian coordinate.
19. A dynamic control method for controlling a backlight module of an LCD according to claim 18 , wherein a lower limit of grayscale level replaces the maximum of raw grayscale level when the maximum value of raw grayscale level is less than the lower limit of grayscale level.
20. A dynamic control method for controlling a backlight module of an LCD according to claim 11 also comprises a step of transferring the plurality of corrected grayscale level to a data modification which uses the plurality of corrected grayscale level to compare with the plurality of raw grayscale level for computing a plurality of optimized grayscale level, wherein the plurality of optimized grayscale level is further transferred to a timing controller which sends the plurality of optimized grayscale level and a control signal to the LCD panel for brightness control in order to optimize image performance.
21. A dynamic control method for controlling a backlight module of a liquid crystal display (LCD), wherein the backlight of the LCD is provided with a plurality of light sources of the backlight module and controlled by a backlight control unit, comprising the following steps:
receiving a frame data which is transferred to the LCD and consists of a plurality of raw grayscale level;
processing a statistical analysis for distribution of the plurality of raw grayscale level, wherein the bits of raw grayscale level can be truncated and represented as most significant bit (MSB) through a manner of bit truncation for reducing data process during the step of processing statistical analysis; and
transferring a plurality of corrected grayscale level which results from the statistical analysis corresponding to the raw grayscale level to the backlight control unit and a data modification simultaneously, wherein the backlight control unit uses the plurality of corrected grayscale level to modify the brightness of the backlight module and the data modification uses the plurality of corrected grayscale level to compare with the plurality of raw grayscale level for accurate display performance.
22. A dynamic control method for controlling a backlight module of a liquid crystal display (LCD), wherein the backlight of the LCD is provided with a plurality of light sources of the backlight module and controlled by a backlight control unit, comprising the following steps:
receiving a frame data which is transferred to the LCD and consists of a plurality of raw grayscale level;
processing a statistical analysis for distribution of the plurality of raw grayscale level; and
transferring a plurality of corrected grayscale level which results from the statistical analysis corresponding to the raw grayscale level to the backlight control unit and a data modification simultaneously, wherein the raw grayscale level and the corrected grayscale level are variables of (X, Y) Cartesian coordinate respectively and the relationship between them is a curve through (0, 0) and (maximum of raw grayscale level, maximum of corrected grayscale level) on (X, Y) Cartesian coordinate, and the backlight control unit uses the plurality of corrected grayscale level to modify the brightness of the backlight module and the data modification uses the plurality of corrected grayscale level to compare with the plurality of raw grayscale level for accurate display performance.
23. A dynamic control method for controlling a backlight module of a liquid crystal display (LCD), wherein the backlight of the LCD is provided with a plurality of light sources of the backlight module and controlled by a backlight control unit, comprising the following steps:
receiving a frame data which is transferred to the LCD and consists of a plurality of raw grayscale level;
processing a statistical analysis for distribution of the plurality of raw grayscale level, wherein the bits of raw grayscale level can be truncated and represented as most significant bit (MSB) through a manner of bit truncation for reducing data process during the step of processing statistical analysis; and
transferring a plurality of corrected grayscale level which results from the statistical analysis corresponding to the raw grayscale level to the backlight control unit, wherein the backlight control unit uses the plurality of corrected grayscale level to modify the brightness of the backlight module.
24. A dynamic control method for controlling a backlight module of a liquid crystal display (LCD), wherein the backlight of the LCD is provided with a plurality of light sources of the backlight module and controlled by a backlight control unit, comprising the following steps:
receiving a frame data which is transferred to the LCD and consists of a plurality of raw grayscale level;
processing a statistical analysis for distribution of the plurality of raw grayscale level; and
transferring a plurality of corrected grayscale level which results from the statistical analysis corresponding to the raw grayscale level to the backlight control unit, wherein the raw grayscale level and the corrected grayscale level are variables of (X, Y) Cartesian coordinate respectively and the relationship between them is a curve through (0, 0) and (maximum of raw grayscale level, maximum of corrected grayscale level) on (X, Y) Cartesian coordinate, and the backlight control unit uses the plurality of corrected grayscale level to modify the brightness of the backlight module.