Blue Sub-Pixel Driving Voltage Control for Display Color Shift
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Solution Overview
Problem
Conventional large-sized display apparatuses using negative vertical alignment (VA) liquid crystal technology suffer from significant viewing angle color shift due to rapid brightness saturation, particularly in blue sub-pixels, leading to image quality deficiencies.
Innovation Solution
A method and apparatus that divide display panel pixels into groups, calculate display hue and color purity, and use a Look Up Table (LUT) to determine high and low driving voltages for blue sub-pixels, ensuring controlled brightness variation and reducing color shift by driving blue sub-pixels with voltage pairs tailored to each pixel group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional VA liquid crystal technology is used for large-sized display, then the display can achieve large screen size, but the viewing angle color shift becomes serious due to rapid brightness saturation
Solution Approach 1:
The patent segments the pixel array into multiple pixel groups, with each group containing multiple pixels. Different driving voltages are applied to different pixel groups based on their position and the displayed content, allowing selective control of brightness saturation in different regions to reduce viewing angle color shift
Solution Approach 2:
The patent implements local quality by applying different driving strategies to different pixel groups. Pixel groups displaying blue content receive different voltage treatment compared to other color groups, and pixel groups at different positions (edge vs center) receive differentiated driving voltages to locally optimize brightness characteristics and reduce color shift
2Illumination intensity
If the brightness of blue sub-pixels is increased to improve display quality, then the viewing angle color shift worsens due to premature saturation
Solution Approach 1:
The patent implements dynamic voltage adjustment where the driving voltage for blue sub-pixels is not fixed but varies based on the gray level being displayed. Lower voltages are applied at certain gray levels to prevent saturation, while higher voltages are used at other levels, creating a dynamic driving strategy that maintains image quality
Solution Approach 2:
The patent changes the electrical parameter (driving voltage) of blue sub-pixels based on the displayed content and position. By adjusting the voltage parameter dynamically rather than using a fixed voltage, the system prevents brightness saturation and reduces viewing angle color shift while maintaining display quality
Data Source
AI summary
A method for driving a display apparatus includes: dividing pixels on a display panel into a plurality of pixel groups; each of the pixel groups includes an even number of sequentially adjacent pixels; calculating a display hue of each of the pixel groups according to an image input signal; obtaining a Look Up Table (LUT) according to a hue range of the display hue; the LUT is a correspondence table between color gray scale values of blue sub-pixels and driving voltage pairs; the driving voltage pair comprises a high driving voltage and a low driving voltage; obtaining the driving voltage pair using the corresponding LUT according to an average gray scale value of the blue sub-pixels in each of the pixel groups; and driving the blue sub-pixels on the corresponding pixel group according to the driving voltage pair.