LCD Panel Driving Method Alleviating Color Shift at Large Viewing Angles
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Solution Overview
Problem
Conventional large-size liquid crystal displays experience severe color shift at large viewing angles due to rapid brightness saturation, and existing solutions that divide sub-pixels into primary and secondary pixels to address this issue compromise transmittance by requiring additional metal wires and thin film transistor elements, which reduce light transmission.
Innovation Solution
A driving method that sets different grayscale values for blue sub-pixels in a pixel group across multiple frames of display cycles, with each frame using a target grayscale value pair where the first value is greater than and the second value is less than the preset grayscale value, and varying these pairs across frames to approximate the front-viewing-angle gamma curve, thereby reducing color shift and minimizing the impact of metal wires and thin film transistor elements on transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels are divided into primary and secondary pixels with different driving voltages, then color shift under large viewing angle is improved, but light transmission opening area is greatly reduced
Solution Approach 1:
The patent merges the driving functions for primary and secondary pixels into a single driving electrode structure. Instead of using separate metal wires and thin film transistor elements for each pixel type, the invention uses one driving electrode that applies different grayscale values to different sub-pixels within a pixel group, thereby avoiding the need for additional structural elements that would block light transmission.
Solution Approach 2:
The driving electrode serves multiple functions: it drives both primary and secondary pixels simultaneously, and it applies different driving voltages (grayscale values) to different sub-pixels within the same pixel group. This multi-functional approach eliminates the need for dedicated driving structures for each pixel type, preserving light transmission opening area.
2Reliability
If additional metal wires and thin film transistor elements are added to drive primary and secondary pixels, then color shift problem is solved, but transmittance of display panel is reduced
Solution Approach 1:
The patent extracts the color shift correction function from the structural elements (metal wires and thin film transistors) and implements it through electrical signal processing instead. By using different grayscale values in driving signals rather than additional physical structures, the invention achieves color shift correction without adding light-blocking elements.
Solution Approach 2:
The invention replaces the mechanical/structural approach (adding more metal wires and transistor elements) with an electrical/control approach (using different grayscale values in driving signals). This substitution achieves the same color shift correction function without the physical overhead that would reduce transmittance.
3Ease of manufacture
If different grayscale values are applied to blue sub-pixels across multiple frames, then color shift is alleviated and gamma curve is improved, but display complexity increases
Solution Approach 1:
The patent implements periodic action by cycling through different grayscale value assignments for blue sub-pixels across multiple display frames. Different pixel groups receive different grayscale value pairs in different frames, and this pattern repeats periodically. This periodic variation achieves color shift correction and gamma curve improvement without requiring complex real-time adjustments.
Data Source
AI summary
A driving method for a display device and a display device are disclosed. The driving method includes: obtaining a pre-display image; obtaining, according to an average of corresponding preset grayscale values of two blue sub-pixels in a pixel group, n sets of target grayscale value pairs of the pixel group by table lookup; and displaying a same pre-display image in m continuous frames of display cycles.