Touch IC Common Voltage Compensation for Display Flickering
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Solution Overview
Problem
Display devices with integrated in-cell type touch screens face challenges in implementing a common voltage compensation circuit due to the division of common electrodes into driving and sensing electrodes, leading to issues like flickering and image sticking defects.
Innovation Solution
A touch integrated circuit (IC) is used to generate and apply a compensation common voltage to both driving and sensing electrodes, stabilizing the display function and simplifying the implementation of a common voltage compensation circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If common electrodes are divided into driving electrodes and sensing electrodes for touch function, then touch function is enabled, but implementation of common voltage compensation circuit becomes complicated
Solution Approach 1:
The patent merges the common voltage compensation function with the touch control IC by integrating a compensation circuit inside the touch control IC. This combines two previously separate functions (touch control and voltage compensation) into a single integrated circuit, simplifying the overall system architecture while maintaining both touch functionality and display stability.
Solution Approach 2:
The touch control IC is designed to perform multiple functions: it controls the touch screen operations and simultaneously generates compensation common voltages for the display panel. This multi-functional design eliminates the need for separate compensation circuits, reducing system complexity while enabling both touch interaction and stable display performance.
2Stability of the object's composition
If common voltage is applied to divided driving and sensing electrodes, then display function is maintained, but common voltage difference occurs causing flickering and image sticking defects
Solution Approach 1:
The compensation circuit within the touch control IC implements feedback by monitoring the common voltage applied to the divided electrodes and automatically adjusting the compensation voltage to eliminate voltage differences. This closed-loop feedback mechanism ensures stable common voltage distribution across all electrodes, preventing flickering and image sticking defects while maintaining display functionality.
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
This solution allows for stable display performance by compensating for feedback common voltage, reducing flickering and image sticking defects, and simplifies the implementation of a common voltage compensation circuit, saving costs and complexity.
Implementation Method 1
a touch integrated circuit (IC) compensating for a feedback common voltage outputted from the panel by generating a compensation common voltage
Data Source
AI summary
A display device with integrated touch screen is provided. The display device may include a panel and a touch IC. The panel may include a plurality of driving electrodes and sensing electrodes. The touch IC may compensate for a feedback common voltage outputted from the panel by generating a compensation common voltage based on the feedback common voltage and applying the compensation common voltage to the driving electrodes and the sensing electrodes when the panel operates in a display driving mode.