Display Driving Voltage Compensation for Uniform Sub-Pixel Charging
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Solution Overview
Problem
The effective charging time of the positive polarity voltage corresponding to a grayscale is less than the effective charging time of the negative polarity voltage in prior art display devices, leading to display uniformity issues.
Innovation Solution
A display device with an adjustment unit in the driving module that increases the voltage values of positive polarity voltages to compensate for the charging difference, outputting compensated positive polarity voltages to sub-pixels, thereby reducing the charging difference between positive and negative polarity voltages and improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display panel uses dual-gate driving architecture with large size and high resolution, then the display quality is improved, but the charging rate becomes insufficient due to RC delay of wiring
Solution Approach 1:
The patent applies preliminary action by compensating for the RC delay effect in advance through waveform adjustment. The scanning signal waveform is pre-adjusted to account for the expected signal attenuation and distortion that will occur during transmission through the wiring, ensuring that the signal reaches the farthest pixels with adequate charging characteristics despite the RC delay of the wiring infrastructure.
2Ease of operation
If the scanning signal is transmitted through wiring with RC delay, then the display panel can be driven, but the waveforms of scanning signals and data signals are attenuated and distorted, especially at positions far from voltage output end
Solution Approach 1:
The patent applies parameter changes by adjusting the waveform parameters of the scanning signal to compensate for RC delay effects. Specifically, the rising edge slope and pulse width of the scanning signal are modified to ensure that despite signal attenuation and distortion during transmission through the wiring, the liquid crystal molecules still receive adequate charging voltage to achieve uniform display across the entire panel.
3Stability of the object's composition
If data voltages switch between positive polarity voltage and negative polarity voltage to prevent polarization of liquid crystal molecules, then display uniformity should be maintained, but the effective charging time of positive polarity voltage is less than that of negative polarity voltage due to waveform distortion
Solution Approach 1:
The patent applies asymmetry by implementing asymmetric compensation for positive and negative polarity voltages. Since the waveform distortion affects positive and negative polarity signals differently, the patent adjusts the scanning signal waveform asymmetrically to ensure that both positive and negative polarity data voltages achieve equal effective charging times, thereby maintaining display uniformity despite the inherent asymmetry in RC delay effects.
Data Source
AI summary
The present application discloses a display device. The display device includes a display panel and a driving module. Each grayscale includes a positive polarity voltage and a negative polarity voltage symmetrical with respect to a common voltage. A data line is configured to output corresponding data voltages to each sub-pixel respectively. The driving module includes an adjustment unit. The adjustment unit is configured to increase the voltage values of the positive polarity voltages to obtain the compensated positive polarity voltages. The data voltages are the negative polarity voltages or the compensated positive polarity voltages.