In-Cell Touch Display Grey Level Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-cell touch display devices exhibit differences in grey level image display when the touch function is turned on and off, resulting in inconsistent image presentation.
Innovation Solution
A method and device that determine whether the touch mode is enabled, adjust the duty cycle of the control signal, and compensate for brightness changes by calculating grey level compensation sequences based on differences in brightness values when the touch mode is on and off, thereby adjusting the backlight module's brightness and liquid crystal compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch mode is turned on in an in-cell touch display device, then the touch function is enabled, but the grey level display becomes inconsistent compared to when the touch mode is off
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values for different touch pressures and grey levels before actual touch operation. When touch mode is activated, the system retrieves and applies the corresponding compensation values to adjust the liquid crystal voltages, ensuring consistent grey level display without real-time complex calculations.
Solution Approach 2:
The patent changes the voltage parameters applied to liquid crystal molecules based on touch detection results. Different touch pressures trigger different voltage compensation values, which modify the liquid crystal orientation and optical properties to maintain consistent grey level perception despite the presence of the touch layer.
2Manufacturing precision
If the duty cycle of the control signal is adjusted to compensate for brightness changes, then the grey level consistency is improved, but the control signal complexity increases
Solution Approach 1:
The patent pre-calculates compensation values for various touch scenarios and stores them in lookup tables. This eliminates the need for complex real-time calculations, allowing the system to simply retrieve and apply pre-determined duty cycle adjustments based on detected touch conditions.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with electronic signal processing. Instead of physically adjusting components, the system uses digital signal processing to modify control signal duty cycles, achieving grey level compensation through software-based parameter adjustment rather than mechanical means.
Data Source
AI summary
A touch display device and an improvement method to a touch display device are disclosed. The improvement method first determines whether the touch display device turns on the touch mode. If yes, image data input to the touch display device is obtained and feature data is extracted from the image data. Then, adjustment or compensation factors are obtained according to the feature data. Grey level compensation sequence is also obtained. The duty cycle of the control signal for the touch display device is adjusted according to the factors and the grey level compensation sequence, so as to improve the display difference for a same grey level image due to the turning on of the touch mode.