Display Panel Driving Method for Voltage Ripple Compensation
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Solution Overview
Problem
In display panels, the common voltage is easily affected by changes in data voltage due to their proximity, leading to a ripple phenomenon that reduces the voltage difference between the pixel and common electrodes, thereby affecting display quality, especially in FULL IN-CELL panels with multiple sensing electrodes.
Innovation Solution
A driving method that calculates and applies a compensation data signal to the pixel electrode, determined as half of the maximum sensing signal, to maintain a stable voltage difference, using a lookup table or proportional coefficient formulas to adjust for various gray scales, without modifying the hardware.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the common electrode and pixel electrode are placed close together to achieve FULL IN-CELL display structure, then the display integration is improved, but the common voltage becomes susceptible to data voltage changes causing ripple phenomenon
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in a lookup table before actual display operation. The compensation value for each gray scale level is determined in advance and stored, so that during display, the system only needs to retrieve the pre-computed compensation value corresponding to the current data voltage, eliminating the need for real-time complex calculations and ensuring stable voltage difference maintenance
Solution Approach 2:
The patent implements feedback by continuously monitoring the voltage difference between pixel and common electrodes and dynamically adjusting the data voltage through compensation. The system calculates the actual voltage difference, compares it with the target value, and applies compensation based on the deviation, creating a closed-loop control mechanism that maintains voltage stability throughout display operation
2Ease of operation
If the common voltage is set to -2V to 0V and data voltage to 4.5V to 6V to achieve proper electrode polarization, then the display function is improved, but the voltage difference is reduced due to ripple effect
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the data voltage parameter based on the gray scale level and measured voltage difference. Instead of using fixed voltage values, the system calculates compensation values that modify the data voltage parameter in real-time, ensuring that the voltage difference between pixel and common electrodes remains consistent across different display conditions and gray scale levels
3Measurement precision
If multiple sensing electrodes are used in FULL IN-CELL display panel to improve sensing capability, then the sensing performance is improved, but the common voltage becomes more susceptible to data voltage changes
Solution Approach 1:
The patent applies segmentation by separately addressing the voltage compensation for each sensing electrode region. The lookup table stores compensation values specific to different gray scale levels, allowing the system to apply targeted compensation to each sensing electrode area independently, thereby reducing cross-interference between adjacent sensing electrodes while maintaining overall sensing performance
Data Source
AI summary
The present application provides a driving method of a display panel, a computer storage medium, a compensation circuit, and a display device. The display panel includes a plurality of sub-pixels, each of the plurality of sub-pixels including a pixel electrode and a common electrode, the driving method including: determining a data signal to be provided to the pixel electrode of each of the plurality of sub-pixels according to an image to be displayed by the display panel; calculating a compensation data signal to be provided to the pixel electrode of each of the plurality of sub-pixels according to the data signal; and providing the data signal and the compensation data signal simultaneously to the pixel electrode of each of the plurality of sub-pixels.