VA LCD Partition Driving for Color Cast Correction
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Solution Overview
Problem
Liquid crystal display (LCD) devices with Vertical Alignment (VA) mode face challenges in maintaining color brightness and saturation due to changes in voltage, leading to poor color cast performance, especially at low gray scales and large viewing angles.
Innovation Solution
A driving method and apparatus that selects partitions in a display interface, calculates chroma and hue values, and adjusts gray scale parameters of sub-pixel units to improve color cast image quality by optimizing RGB values and voltage settings based on calculated chroma and hue values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If voltage drive is changed from high voltage to low voltage, then power consumption is reduced, but color brightness and saturation deteriorate
Solution Approach 1:
The patent changes the gray scale parameters (voltage or current values) based on the calculated chroma and hue values of the selected partition. By dynamically adjusting these parameters according to the actual color characteristics, the system maintains color brightness and saturation even when operating at lower voltage drives, thus reducing power consumption without sacrificing display quality
Solution Approach 2:
The patent implements a feedback mechanism where chroma and hue values are calculated from the actual display content, and this information is used to adjust the gray scale parameters. This closed-loop control ensures that color brightness is maintained by continuously adapting the drive parameters based on the measured color characteristics of the displayed image
2Use of energy by stationary object
If voltage drive is changed from high voltage to low voltage, then power consumption is reduced, but color saturation deteriorates
Solution Approach 1:
The patent dynamically adjusts gray scale parameters based on calculated chroma values, which directly represent color saturation. By modifying the gray scale voltage or current values according to the actual chroma requirements of the displayed content, the system maintains color saturation at low voltage drives while minimizing power consumption
Solution Approach 2:
The patent divides the display interface into multiple partitions and selects specific partitions for processing. By applying gray scale parameter adjustments only to selected partitions with specific color characteristics, the system maintains color saturation in critical areas while operating at lower overall power levels
3Illumination intensity
If gray scale parameters are adjusted to improve color brightness, then color cast image quality is improved, but device complexity increases
Solution Approach 1:
The patent divides the display interface into multiple partitions and processes only selected partitions rather than the entire display. This segmentation reduces the computational complexity of calculating chroma and hue values and adjusting gray scale parameters, while still achieving improved color brightness in the most critical display areas
Solution Approach 2:
The patent applies gray scale parameter adjustments only to selected partitions rather than uniformly across the entire display. This partial action approach improves color brightness where it matters most while minimizing the overall processing complexity and computational resources required
Data Source
AI summary
The present disclosure provides a driving method and apparatus for a display apparatus. The driving method includes: selecting one of at least two partitions divided in a display interface, marking the one as a selected partition; calculating a chroma and a hue value of the selected partition; adjusting initial gray scale parameters of sub-pixel units of each of the pixel units according to the chroma and the hue value, acquiring an initial input signal of the selected partition, and adjusting the gray scale parameters corresponding to the initial input signal according to the initial input signal and the initial gray scale parameters of the sub-pixel units.