Touch Display Panel Electrode Segmentation for Narrow Bezel
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Solution Overview
Problem
Large touch display devices require numerous touch electrodes and signal lines to maintain detection accuracy, leading to increased bezel width, which contradicts the trend towards narrow-bezel designs.
Innovation Solution
A touch display panel with a first and second touch electrode array, where each first touch electrode has a connection portion extending along the second direction and additional electrode blocks on one side, with their projections overlapping multiple second touch electrodes, reducing the number of electrodes and signal lines needed while enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the screen size of the touch display device is large, then the touch detection accuracy can be maintained, but the number of touch scan signal lines and touch sensing signal lines increases, leading to increased bezel width
Solution Approach 1:
The first touch electrodes are segmented into multiple first electrode blocks along the first direction. Each first electrode block can independently form a capacitor with second touch electrodes, enabling one first touch electrode to detect multiple touch positions along the first direction. This segmentation allows the patent to reduce the number of first touch electrodes needed while maintaining touch detection accuracy across large screens.
Solution Approach 2:
The patent extends the detection capability from one dimension to two dimensions by arranging first electrode blocks along the first direction and second touch electrodes along the second direction. The orthographic projection of first electrode blocks overlaps with multiple second touch electrodes, creating a two-dimensional detection matrix that reduces the total number of electrodes required while maintaining accuracy across large display areas.
2Measurement precision
If the number of touch transmitting electrodes and touch sensing electrodes is increased, then the touch detection accuracy is improved, but the number of signal lines increases, requiring more space
Solution Approach 1:
By segmenting first touch electrodes into multiple first electrode blocks, the patent enables each first touch electrode to serve multiple detection functions. This reduces the total number of first touch electrodes needed, thereby reducing the number of corresponding touch scan signal lines required to connect them to the integrated circuit.
Solution Approach 2:
The patent merges the detection functions of multiple electrodes by having first electrode blocks overlap with multiple second touch electrodes. This allows a reduced set of first touch electrodes to work in conjunction with second touch electrodes to maintain comprehensive touch detection coverage, reducing the overall electrode and signal line count.
3Device complexity
If the number of touch electrodes is reduced, then the number of signal lines decreases, but the touch detection accuracy may be compromised
Solution Approach 1:
Segmenting first touch electrodes into multiple first electrode blocks allows each first touch electrode to detect multiple touch positions along the first direction. This maintains touch detection accuracy across large screens while reducing the total number of first touch electrodes needed.
Solution Approach 2:
The two-dimensional arrangement of first electrode blocks and second touch electrodes creates an efficient detection matrix where fewer electrodes can cover larger areas. The orthographic projection overlap ensures that reduced electrode counts still provide comprehensive detection coverage.
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 configuration improves touch detection accuracy and reduces the number of electrodes and signal lines, aligning with the development trend towards narrow-bezel display devices by effectively covering larger areas with fewer components.
Implementation Method 1
each of the first touch electrodes forms a capacitor with each of the touch sensing electrodes 121 at the overlap. The touch position is detected according to the variation in capacitance.
Data Source
AI summary
The present application discloses a touch display panel and a touch display device. An embodiment of the touch display panel includes: a first touch electrode array, comprising M first touch electrodes including 1st to Mth first touch electrodes, arranged along a first direction; and a second touch electrode array, comprising N second touch electrodes; each of the first touch electrodes comprising a first connection portion extending along the second direction, and each of the 2nd to Mth first touch electrodes further comprising a plurality of first electrode blocks; and an orthographic projection of each of the first electrode blocks on the second touch electrode array at least partially overlapping at least two second touch electrodes. The embodiment has improved touch detection accuracy.