In-Cell Touch Display Voltage Compensation for Image Uniformity
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Solution Overview
Problem
In-cell touch control technique for touch screens results in non-uniform image display due to voltage differences across common electrodes, leading to inconsistent brightness across the screen.
Innovation Solution
Compensating image signals based on voltage shift data to equalize voltage differences between pixel and common electrodes, using a method that involves calculating compensation data from grey level information differences and integrating this data into the display process to ensure uniformity without reducing image brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If in-cell touch control technique integrates touch control electrodes into the common electrode, then the depth and weight of the display panel are reduced, but the conducting lines become longer and resistance increases causing voltage non-uniformity
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values for different display regions based on conductor length and resistance characteristics. Before actual display, the system retrieves appropriate compensation values and adjusts image signals in advance, preventing voltage non-uniformity effects from manifesting in the final display without requiring real-time complex calculations.
2Adaptability or versatility
If conductor length increases to reach integrated electrodes, then electrode integration is achieved, but resistance increases causing Vcom shift and image non-uniformity
Solution Approach 1:
The patent applies local quality by dividing the display panel into multiple regions with different compensation characteristics based on their distance from the common electrode terminal. Each region is assigned specific compensation values that account for local conductor resistance differences, allowing tailored voltage correction for each area rather than applying a uniform correction across the entire panel.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the image signal parameters (brightness, contrast, color values) based on stored compensation data corresponding to different display regions. The system modifies signal parameters to compensate for voltage drops caused by varying conductor lengths, ensuring consistent visual output despite physical variations in the electrode structure.
3Ease of operation
If different voltage values are applied to pixel electrodes due to Vcom shift, then touch control functionality is maintained, but image uniformity deteriorates
Solution Approach 1:
The patent applies feedback by using detected display non-uniformity characteristics to adjust image signals. The system analyzes the relationship between conductor length, resistance, and resulting voltage variations, then uses this information to generate compensating adjustments that are applied to the image signals, creating a closed-loop approach that ensures uniform display output while maintaining touch control operations.
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
The solution effectively improves image uniformity and user experience by ensuring consistent voltage application across the screen, maintaining brightness levels and addressing the inherent structural inaccuracies in touch control electrode configurations.
Implementation Method 1
a liquid crystal layer disposed between the color-film substrate and the array substrate
Implementation Method 2
a projected capacitive touch screen, which uses the touch control technique comprising self-capacitive touch technique and mutual-capacitive touch technique wherein a capacitance variation is generated when the finger is closing to the capacitive touch control panel
Data Source
AI summary
The present application provides a method and display apparatus for improving uniformity of displayed image, The method comprises inputting a first image signal to a display apparatus; compensating the first image signal in accordance with an image compensation data to obtain a third image signal, wherein the image compensation data is an amount of shift in a voltage of a common electrode of an array substrate of the display apparatus determined in accordance with a difference value between a grey level information of the first image signal and the grey level information of an original second image signal corresponding to the first image signal; and displaying the third image signal. Through the method above, the present invention effectively improves the uniformity of the displayed image without decreasing the displayed brightness of the image.