Liquid Crystal Display Driving Method for Color Shift Reduction
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Solution Overview
Problem
Liquid crystal display devices experience significant color shift at large viewing angles due to rapid saturation increase of the viewing angle to luminance ratio, particularly in gray-scale displays, which is exacerbated by the need for additional metal wires and increased production costs to alleviate this issue.
Innovation Solution
A driving method that determines the type of color corresponding to an original gray-scale data group and divides it into three gray-scale data groups, outputting each in consecutive time periods, increasing the driving frequency and backlight luminance to maintain display speed and luminance while reducing color shift without additional wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the primary pixel and secondary pixel are driven with relatively high and low drive voltages respectively to alleviate color shift, then the color shift condition at large viewing angle is improved, but the aperture ratio of the panel is reduced and production cost is increased due to doubled metal wires and drive devices
Solution Approach 1:
The patent segments the gray-scale data into multiple groups (first gray-scale data group, second gray-scale data group, third gray-scale data group) and displays them in consecutive time periods. This temporal segmentation allows the single pixel to simulate the effect of multiple pixels with different drive voltages without requiring additional physical pixels or metal wires, thus maintaining aperture ratio while alleviating color shift.
Solution Approach 2:
The patent employs periodic action by displaying different gray-scale data groups in consecutive time periods. The pixel alternates between displaying different gray-scale values at different times, creating a temporal multiplexing effect that simulates the appearance of multiple pixels with different drive voltages, thereby reducing color shift without increasing hardware complexity.
2Object-affected harmful factors
If additional metal wires are added to drive secondary pixels, then the color shift is alleviated, but the aperture ratio is reduced and light transmittance is affected
Solution Approach 1:
The patent segments the driving task temporally by dividing gray-scale data into multiple groups displayed in consecutive time periods. This eliminates the need for additional metal wires that would block light, thereby maintaining light transmittance while still achieving color shift alleviation through temporal multiplexing.
Solution Approach 2:
The patent replaces the mechanical/additional wire solution with a software/data processing solution. Instead of adding physical metal wires to drive secondary pixels, the patent uses data processing to divide gray-scale data and display it in consecutive time periods, substituting a mechanical structure with an information-based approach that does not affect light transmittance.
3Object-affected harmful factors
If gray-scale data is divided into multiple groups and displayed in consecutive time periods, then color shift is alleviated, but the driving frequency must be increased to maintain display speed
Solution Approach 1:
The patent uses periodic action by displaying different gray-scale data groups in consecutive time periods. This temporal multiplexing allows the single pixel to present multiple gray-scale levels sequentially, alleviating color shift while maintaining display speed through proper timing and frequency control of the periodic display.
Data Source
AI summary
This application relates to a display device and a driving method thereof. An original gray-scale data group is decomposed into three gray-scale data groups for respective output and display in three consecutive time periods according to a determined type of a color corresponding to the original gray-scale data group to be displayed by a pixel unit.