In-Cell Touch Panel Electrode Sharing for Thin, Accurate Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-cell touch display panels face challenges in achieving reduced thickness, improved touch sensing accuracy, and reduced touch sensing time.
Innovation Solution
The in-cell touch display panel incorporates a first and second common electrode connected to pixels, with a pixel driver that writes pixel data and supplies voltage to these electrodes, and a touch driving signal is used to sense touch during specific periods while allowing image display, enabling temporal division of touch sensing and display driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If in-cell touch display panel uses traditional separate touch electrode and display electrode structures, then touch sensing function can be achieved, but panel thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent combines the touch electrode and display electrode into a single integrated electrode structure. The common electrode serves dual functions: as a touch sensing electrode and as a display electrode, eliminating the need for separate electrode layers and thereby reducing panel thickness while maintaining both touch and display functionalities
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously. It acts as both the touch sensing electrode for detecting finger contact and the display electrode for controlling pixel output, making the electrode structure universal and reducing overall device complexity
2Length of moving object
If in-cell touch display panel uses integrated electrode structure, then panel thickness is reduced, but touch sensing accuracy and response time are affected
Solution Approach 1:
The patent divides the touch sensing process into distinct time periods: a first touch period dedicated to touch sensing where the common electrode operates as a touch electrode, and a second touch period for display operation. This temporal segmentation allows the integrated electrode to achieve both high touch sensing accuracy and proper display functionality without interference
3Loss of time
If in-cell touch display panel uses temporal division of touch sensing and display driving, then touch sensing time is reduced and accuracy is improved, but driving complexity increases
Solution Approach 1:
The patent implements periodic switching between touch sensing mode and display driving mode through the pixel driver. The driver periodically applies touch driving signals during first touch periods and display driving signals during second touch periods, creating a rhythmic alternation that enables both functions to operate efficiently with reduced sensing time and improved accuracy
Data Source
AI summary
An in-cell touch display panel includes a first common electrode connected to first pixels in a display area, a second common electrode connected to second pixels in the display area, and a first pixel driver in the display area and configured to write pixel data to the first pixels and the second pixels and supply a voltage to the first common electrode and the second common electrode.