Liquid Crystal Display Driving Method for Color Shift Reduction
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Solution Overview
Problem
Liquid crystal display devices experience significant color shifts at large viewing angles due to rapid saturation increases in brightness, particularly with red, green, and blue color systems, leading to differences in brightness between front and side viewing angles, especially at lower gray-scale values, which existing methods struggle to address without increasing production costs or affecting light transmittance and aperture ratio.
Innovation Solution
A driving method for liquid crystal display devices that divides the display module into independent areas with corresponding independent backlight units, where the original gray-scale data is decomposed into multiple groups based on color types, and specific backlight sources are turned off to manage average gray-scale values, thereby alleviating color shifts without additional wiring or increased costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If secondary pixels are driven with low voltage to alleviate color shift, then color shift at large viewing angle is reduced, but metal wire routing and driving devices must be doubled which affects light transmittance and aperture ratio
Solution Approach 1:
The patent combines the driving functions of primary and secondary pixels into a single driving device. The controller alternates between driving primary pixels alone and driving both primary and secondary pixels together using the same driving circuitry, eliminating the need for separate driving devices and reduced wire routing while still achieving color shift compensation through selective voltage application
2Object-affected harmful factors
If secondary pixels are driven with low voltage to alleviate color shift, then color shift at large viewing angle is reduced, but production costs increase
Solution Approach 1:
The patent uses the same driving device and circuitry for both primary and secondary pixels, merging the driving functions into a single system. This approach eliminates the need for additional driving circuits and reduced wire routing that would increase manufacturing complexity and cost, while still achieving color shift compensation through the controller's ability to selectively apply different voltages to primary and secondary pixels
3Object-affected harmful factors
If gray-scale values are subdivided into multiple groups for display, then color shift is reduced, but display speed decreases due to multiple time periods required
Solution Approach 1:
The patent employs periodic action by alternating between different driving modes in sequential time periods. The controller periodically switches between driving primary pixels alone and driving both primary and secondary pixels, using the same physical pixels in different configurations. This periodic switching achieves color shift compensation without requiring additional pixels or permanent structural changes that would slow down display response
Data Source
AI summary
A method for driving a display apparatus. The method comprises: dividing an original gray scale data set of a pixel unit (110) into three grayscale data sets, and then, when the divided grayscale data sets are displayed, turning off backlight units (320), the colors of which are the same and occupy most of the colors corresponding to 0 grayscale data.