Display Panel Driving Method for Brightness Uniformity
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Solution Overview
Problem
Conventional LCD display devices experience brightness differences between upper and lower regions due to uneven polarity inversion of the electric field, leading to potential liquid crystal layer deterioration and reduced image quality.
Innovation Solution
A method of driving a display panel by periodically inverting the polarity of the common voltage asynchronously with the frame period, ensuring uniform distribution of polarity inversion timings and applying gate signals to gate lines in a manner that maintains equal average elapsed time across all lines, thereby reducing brightness differences and preventing liquid crystal layer deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polarity inversion methods (frame inversion, line inversion, dot inversion) are used to prevent liquid crystal layer deterioration, then the liquid crystal layer is protected from polarization damage, but brightness differences occur between upper and lower regions of the display panel
Solution Approach 1:
The patent applies periodic polarity inversion at intervals shorter than the frame period, creating multiple inversion cycles within each frame. This periodic action ensures uniform voltage application across all pixels by distributing inversion timings evenly, preventing both liquid crystal deterioration and brightness non-uniformity
Solution Approach 2:
The patent dynamically adjusts the polarity inversion timing based on the gate signal activation sequence. By synchronizing polarity inversion with the dynamic scanning process of gate lines, the system achieves uniform effective voltage distribution across different regions of the display panel, eliminating brightness differences while maintaining crystal layer health
2Device complexity
If polarity inversion is synchronized with frame periods, then the control is simple, but the effective voltage provided to pixels in the lower region is smaller than that to pixels in the upper region
Solution Approach 1:
The patent implements periodic polarity inversion at intervals shorter than the frame period, creating multiple inversion cycles within each frame. This periodic action ensures uniform voltage application across all pixels by distributing inversion timings evenly, preventing both liquid crystal deterioration and brightness non-uniformity
Solution Approach 2:
The patent uses feedback from the gate signal activation timing to adjust polarity inversion scheduling. By monitoring which gate lines are activated and when, the system dynamically schedules polarity inversions to ensure each pixel receives appropriate voltage application timing, achieving uniform brightness across the display panel
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces or prevents brightness differences between the upper and lower regions of the display panel, enhancing image quality by ensuring consistent voltage application and minimizing liquid crystal layer degradation.
Implementation Method 1
a liquid crystal layer having a dielectric anisotropic material between a pixel electrode and a common electrode
Implementation Method 2
controlling light transmittance of the liquid crystal layer based on an intensity of an electric field formed between the pixel electrode and the common electrode
Implementation Method 3
the LCD device may periodically invert a polarity of the electric field formed between the pixel electrode and the common electrode
Data Source
AI summary
A method of driving a display panel includes sequentially applying a gate signal to a plurality of gate lines of the display panel during each frame period of a plurality of frame periods, applying data voltages to a plurality of data lines of the display panel, and applying a common voltage to the display panel, a polarity of the common voltage being inverted periodically and asynchronously with a frame period of the frame periods.