VA Display Panel Driving Method for Viewing Angle Color Shift
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Solution Overview
Problem
Large-size VA-type liquid crystal display panels suffer from rapid brightness saturation at large viewing angles, leading to deteriorated viewing angle picture quality contrast and color shift compared to front-view quality.
Innovation Solution
The method involves dividing pixels into pairs of pixel sets with each set comprising sub-pixels driven by distinct voltage signals, acquired from a look-up table, to maintain equivalent front viewing-angle brightness, thereby compensating for color shift and improving viewing angle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If VA-type liquid crystal technology is used for large-size display panels, then production efficiency and manufacturing cost are improved, but viewing angle picture quality contrast and color shift deteriorate
Solution Approach 1:
The patent applies parameter changes by implementing a dual voltage signal driving method where different voltage levels are applied to adjacent pixels based on their spatial position. The drive chip selectively outputs first voltage signals or second voltage signals to different pixel sets, changing the electrical parameters to compensate for viewing angle effects and maintain color accuracy across different viewing angles.
2Ease of manufacture
If VA-type liquid crystal technology is used for large-size display panels, then manufacturing cost is reduced, but viewing angle brightness saturation occurs
Solution Approach 1:
The patent changes the voltage parameter applied to pixels based on their spatial location and viewing angle characteristics. By dynamically adjusting voltage levels (first voltage signal versus second voltage signal) for different pixel sets, the system compensates for brightness saturation at large viewing angles while maintaining cost-effective VA-type liquid crystal technology.
3Object-affected harmful factors
If different voltage signals are applied to adjacent pixels to compensate color shift, then viewing angle color accuracy is improved, but drive chip complexity increases
Solution Approach 1:
The patent segments the pixel array into different pixel sets (first pixel sets and second pixel sets) that are driven by different voltage signals. The drive chip is divided into multiple output ends that selectively provide first voltage signals or second voltage signals to different pixel sets, enabling color shift compensation through spatial segmentation of the driving scheme.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the drive chip with multiple output ends capable of providing different voltage signals. The spatial position information of pixels is used in advance to determine which voltage signal should be applied to each pixel set, allowing the system to proactively compensate for viewing angle effects before they manifest as display errors.
4Object-affected harmful factors
If dual voltage signal driving is implemented, then viewing angle contrast is maintained, but signal processing complexity increases
Solution Approach 1:
The patent applies local quality by providing different voltage signals (first voltage signal or second voltage signal) to different spatial locations of pixels based on their specific position in the display panel. Each pixel set receives a voltage signal optimized for its local viewing angle characteristics, maintaining contrast accuracy locally across the entire display area.
Data Source
AI summary
A driving method of a display panel, comprising: dividing pixels on the display panel into pairs of pixel sets, wherein each pair of pixel sets comprises a first pixel set and a second pixel set; acquiring a first voltage signal and a second voltage signal according to a frame input signal look-up-table, wherein a front viewing-angle mixed brightness of the subpixel driven by the first and second voltage signals alternately is equivalent to a front viewing-angle brightness of the subpixel driven by a frame input signal; driving first subpixels of the first and second pixel sets by first and second voltage signals of the first subpixel of the first pixel set, respectively; and driving second subpixels of the first and second pixel sets by second and first voltage signals of the second subpixel of the second pixel set, respectively.