Display Panel Adjustment Capacitance for Flickering
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Solution Overview
Problem
The electrical stability of display panels with RGBW pixel structures is compromised due to differences in storage capacitances caused by varying sub-pixel opening regions, leading to flickering issues when all sub-pixels are operated under a single common electrode voltage.
Innovation Solution
The display panel design includes adjustment capacitances between the drain and/or first electrode of each sub-pixel and the corresponding scan line, allowing for the optimization of common electrode voltage (Vcom) across sub-pixels with different opening regions, ensuring all sub-pixels operate under the same optimal Vcom, thereby improving electrical stability and preventing flickering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common electrode voltage Vcom is applied to all sub-pixels, then the device complexity is reduced, but the electrical stability deteriorates due to different storage capacitances causing flickering
Solution Approach 1:
The patent applies different adjustment capacitance values to different sub-pixels based on their specific opening region areas. Sub-pixels with smaller opening regions are assigned smaller adjustment capacitances, while those with larger opening regions receive larger adjustment capacitances. This local differentiation allows each sub-pixel to be optimized for its specific characteristics while maintaining a unified voltage configuration system.
Solution Approach 2:
The patent changes the capacitance parameter of the adjustment capacitance component to compensate for differences in storage capacitance among sub-pixels. By adjusting the capacitance value according to the opening region area of each sub-pixel, the system achieves uniform effective capacitance across all sub-pixels, eliminating flickering while maintaining a single common electrode voltage configuration.
2Ease of operation
If sub-pixels with different opening regions use the same optimal Vcom, then the ease of operation is improved, but the reliability deteriorates due to some sub-pixels not working at their optimal voltages
Solution Approach 1:
The patent implements local optimization by assigning different adjustment capacitance values to sub-pixels with different opening region areas. This allows each sub-pixel to operate at its optimal voltage condition while the system maintains a unified control approach through a single common electrode voltage Vcom configuration.
Solution Approach 2:
The patent uses adjustment capacitances as compensatory elements that replicate the effect of having different optimal voltages for each sub-pixel type. By introducing these additional capacitance components, the system achieves the performance benefits of customized voltage optimization without the operational complexity of managing multiple voltage configurations.
3Illumination intensity
If the opening region area of white sub-pixel is smaller than RGB sub-pixels to allow backlight illumination, then the light transmittance is improved, but the storage capacitance decreases causing voltage instability
Solution Approach 1:
The patent introduces adjustment capacitances as compensatory elements that counterbalance the reduced storage capacitance in white sub-pixels. By adding this extra capacitance, the system offsets the voltage instability caused by the smaller opening region area, allowing the white sub-pixel to maintain both its light transmittance advantage and voltage stability.
Solution Approach 2:
The patent modifies the capacitance parameter by adding adjustment capacitances to sub-pixels with smaller opening regions. This parameter change compensates for the reduced storage capacitance, ensuring that white sub-pixels with smaller areas can maintain stable operation without sacrificing their light transmittance advantage.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes multiple pixel units. In each of the pixel units, the area of an opening region of at least one sub-pixel is different from the area of an opening region of other sub-pixels. There is an adjustment capacitance between the drain of the thin film transistor and/or the first electrode in each sub-pixel and the scan line corresponding to the sub-pixel, and the sub-pixel having a smaller area of the opening region corresponds to a smaller value of the adjustment capacitance. By adjusting the value of the adjustment capacitance corresponding to the sub-pixels with different areas of opening regions, the optimal Vcom of all the sub-pixels is the same, so that all the sub-pixels operate under the same optimal Vcom.