LCD Panel Polarity Toggle Control for Common-Voltage Flicker
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Solution Overview
Problem
Flicker occurs momentarily during polarity toggle operations in liquid crystal display panels, particularly in high-resolution displays like 4K or 8K LCD TVs, due to shifts in common voltage levels, leading to sudden changes in luminance and visible artifacts like logos or borders.
Innovation Solution
A method and device that compare the initial common voltage level with the post-toggle level, adjusting the voltage levels of RGB data to invert polarity only when a certain ratio change is detected, using gain and offset values to stabilize the common voltage and reduce flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polarity toggle operation is performed to eliminate common voltage shift, then afterimage problem is improved, but flicker occurs momentarily for two frames
Solution Approach 1:
The patent applies preliminary action by detecting the common voltage level change before executing the polarity toggle operation. The controller compares the current common voltage level with the initial level and determines whether a polarity toggle is necessary based on this pre-detection, thereby preventing unnecessary polarity toggles that would cause flicker while still eliminating afterimage when needed.
Solution Approach 2:
The patent implements feedback by continuously monitoring the common voltage level and using this information to control the polarity toggle operation. The controller compares the detected common voltage level with the initial level and adjusts the polarity toggle timing and frequency accordingly, creating a closed-loop system that eliminates afterimage while minimizing flicker through adaptive control.
2Stability of the object's composition
If polarity toggle operation is performed to eliminate common voltage shift, then display stability is improved, but sudden luminance change occurs
Solution Approach 1:
The patent applies preliminary action by detecting common voltage changes before initiating polarity toggle. This pre-detection allows the system to prepare for smooth transitions and avoid sudden luminance changes that would occur with abrupt polarity toggles, while still maintaining voltage stability.
Solution Approach 2:
The patent implements dynamics by making the polarity toggle operation adaptive rather than fixed. The controller dynamically adjusts the polarity toggle timing and frequency based on real-time common voltage level changes, creating smooth luminance transitions while maintaining voltage stability through flexible, condition-based control.
Data Source
AI summary
A device display device according to an embodiment of the present disclosure, comprises a Liquid Crystal Display (LCD) panel and a control unit configured to compare an initial common voltage level of RGB data applied to the LCD panel with a common voltage level obtained after the initial common voltage level, and when the common voltage level is changed more than a certain ratio compared to the initial common voltage level, adjust a voltage level of the RGB data applied to two frames at a time of a polarity toggle operation to invert the polarity of the voltage level of the RGB data.