In-Cell Touch Panel Electrode Segmentation for Display Uniformity
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Solution Overview
Problem
In existing in-cell touch panels based on ADS technology, the different signal transmission loads of touch driving electrodes and common electrodes lead to uneven display images, affecting image quality.
Innovation Solution
The common electrode layer is divided into touch driving electrodes and common electrodes, both arranged in a crisscross manner with sub-electrodes, allowing for time-sharing signal application to ensure identical signal transmission loads, preventing uneven display images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the common electrode layer is divided into touch driving electrodes and common electrodes with different structures, then the touch function and display function are achieved, but the signal transmission loads become different causing uneven display images
Solution Approach 1:
The common electrode layer is segmented into multiple common sub-electrodes along the signal transmission direction, matching the segmentation of touch driving electrodes. This segmentation ensures that both electrode types have comparable signal transmission loads, eliminating the uneven display issue while maintaining dual functionality.
Solution Approach 2:
Different regions of the electrode layer are assigned different functions: touch driving electrodes for touch sensing and common sub-electrodes for display. The local structure is optimized so that common sub-electrodes are arranged to match the length and signal load characteristics of touch driving electrodes, ensuring uniform signal transmission across the display area.
2Measurement precision
If the touch driving electrode consists of multiple sub-electrodes while the common electrode is a single bar-like electrode, then the touch sensing accuracy is improved, but the signal transmission speed becomes uneven affecting image quality
Solution Approach 1:
The common electrode is segmented into multiple common sub-electrodes that correspond in number and arrangement to the touch driving sub-electrodes. This segmentation balances the signal transmission load across both electrode types, ensuring uniform signal transmission speed and eliminating display non-uniformity while preserving high touch sensing accuracy.
3Area of stationary object
If the in-cell touch panel uses ADS technology with crisscross electrode arrangement, then the aperture ratio and light transmittance are improved, but the mutual capacitance between electrodes increases reducing touch accuracy
Solution Approach 1:
Segmenting the common electrode into multiple sub-electrodes reduces the overlapping area between touch sensing electrodes and common electrodes in the projection direction. This segmentation decreases mutual capacitance formation, improving touch accuracy while maintaining the high aperture ratio and light transmittance benefits of the crisscross ADS electrode arrangement.
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 approach improves image quality by ensuring consistent signal transmission between touch driving and common electrodes, reducing production costs and mutual interference, and enhancing touch accuracy.
Implementation Method 1
a multi dimensional electric field is formed by means of electrical fields generated at edges of slit electrodes within an identical plane and an electrical field generated between a slit electrode layer and a plate electrode layer
Implementation Method 2
enable all the liquid crystal molecules between the slit electrodes and right above the electrodes within a liquid crystal cell to rotate
Implementation Method 3
reduce a mutual capacitance formed by the overlapping area, thereby to increase the proportion of the mutual capacitance variation when a touch is made by a finger
Data Source
AI summary
The present disclosure provides an in cell touch panel and a display device. An entire common electrode layer on an array substrate is divided so as to form a plurality of touch driving electrodes and a plurality of common electrodes which are insulated from each other and arranged in a crisscross manner. Each touch driving electrode includes a plurality of touch driving sub-electrodes, and each touch driving sub-electrode is arranged between the adjacent common electrodes. Each common electrode includes a plurality of common sub-electrodes. Touch sensing electrodes are arranged on an opposite substrate, and a projection of each touch sensing electrode onto the array substrate is located at a region where the common electrode is located. The touch driving electrodes are driven in a time-division manner, so as to achieve a touch function and a display function.