Display Device Timing Control for Waveform Compensation
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Solution Overview
Problem
Conventional liquid crystal display devices experience image quality deterioration due to differences in source signal waveforms caused by varying distances of pixel electrodes from the source driver, leading to inconsistent transmittance control.
Innovation Solution
A display device with a controller that adjusts the timing intervals of gate and source signals relative to each other, with longer intervals for pixel electrodes farther from the source driver to compensate for waveform differences, ensuring consistent signal application across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a precharge mode is employed to apply precharge voltage before source signal to compensate for waveform differences, then image quality is improved, but control structure becomes complicated
Solution Approach 1:
The patent changes the timing parameter of gate signal output based on the position of pixel electrodes. Specifically, it adjusts the time interval between source signal output and gate signal output, creating different time intervals for different regions (first time interval for first region, second time interval for second region). This parameter adjustment compensates for waveform differences without requiring complex precharge voltage control structures.
2Area of stationary object
If the source signal is applied to pixel electrodes at different positions, then the display area is covered, but waveform differences occur causing image quality deterioration
Solution Approach 1:
The patent applies different time intervals for gate signal output depending on the local region of the display panel. The first time interval is applied to pixel electrodes in the first region, while the second time interval is applied to pixel electrodes in the second region. This local differentiation compensates for the waveform differences caused by varying distances from the source driver, ensuring consistent transmittance control across the entire display area.
Data Source
AI summary
A display device includes a display portion, a source driver that is connected to a second end of a source signal line to output to the source signal line a first source signal for a first pixel electrode and a second source signal for a second pixel electrode, a gate driver that outputs first and second gate signals to first and second gate signal lines, and a controller that controls the gate driver and the source driver to control output timings of the first and second gate signals relative to output timings of the first and second source signals. The controller sets a first time interval from the output timing of the first source signal to the output timing of the first gate signal to be longer than a second time interval from the output timing of the second source signal to the output timing of the second gate signal.