Touch Sensor Electrodes in Display Peripheral Region
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Solution Overview
Problem
Conventional display devices with touch panels suffer from low touch detection accuracy at the edges and peripheral regions due to the absence of touch detection electrodes in these areas.
Innovation Solution
Incorporating touch sensor electrodes on a first substrate, which includes gate lines, data lines, and pixel electrodes, with a portion of these electrodes placed in the peripheral region outside the image display area, allowing for touch position detection even in peripheral regions by overlapping with gate and data lines and forming openings over pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch detection electrodes are only disposed in the image display region, then the display structure is simple, but touch detection accuracy is low in the peripheral region
Solution Approach 1:
The display panel is divided into two functional regions: the image display region and the peripheral region. Touch detection electrodes are selectively disposed in both regions, with the peripheral region containing electrodes specifically for touch detection without image display functions. This segmentation allows optimized electrode placement for touch detection accuracy in peripheral areas while maintaining simple structure in the image display region.
Solution Approach 2:
Different regions of the display panel are assigned different electrode configurations according to their specific functions. The peripheral region has touch detection electrodes optimized for detecting touch positions at the edges, while the image display region has electrodes configured for both image display and touch detection. This local quality approach ensures that each region has the appropriate electrode distribution for its primary function.
2Adaptability or versatility
If touch sensor electrodes are added in the peripheral region, then touch detection coverage is improved, but the opening ratio may be degraded
Solution Approach 1:
The display panel is segmented into image display regions and peripheral regions with different electrode configurations. In the peripheral region, touch detection electrodes are disposed without requiring transparent pixel electrodes, as this region does not contribute to the image display area. This segmentation allows touch detection coverage extension without compromising the opening ratio of the image display region.
Solution Approach 2:
The pixel electrode function is extracted from the peripheral region, where only touch detection electrodes are disposed. The pixel electrode is removed from the peripheral region since it serves no purpose there (the peripheral region does not display images), allowing touch detection electrodes to be placed without blocking light paths and thus maintaining the opening ratio.
3Measurement precision
If touch detection electrodes are disposed across the image display region and peripheral region, then touch detection accuracy at the end of image display region is improved, but electrode layout complexity increases
Solution Approach 1:
The display panel is divided into image display region and peripheral region, with touch detection electrodes disposed in both regions. The peripheral region contains touch detection electrodes that extend to the edges of the display panel, enabling accurate touch detection at the ends of the image display region. This segmentation approach organizes the electrode layout in a manageable way while achieving the desired detection accuracy.
Solution Approach 2:
The electrode layout extends from the two-dimensional image display region into the peripheral region, adding a spatial dimension to the electrode distribution. By disposing touch detection electrodes in the peripheral region (an additional spatial dimension beyond the image display area), the system achieves improved touch detection accuracy at the edges without significantly increasing layout complexity.
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
Enhances touch detection accuracy by enabling the detection of touch positions in peripheral regions without degrading the display's opening ratio or image quality, improving sensitivity and usability.
Implementation Method 1
a touch position is detected based on a change in electrostatic capacitance between the electrode and a finger
Data Source
AI summary
A display device with a touch detection function includes a first substrate including a plurality of gate lines, a plurality of data lines, a plurality of pixel electrodes, and a plurality of touch sensor electrodes; and a second substrate that is disposed opposite the first substrate. The first substrate is disposed on a touch operation side with respect to the second substrate, and a part of the plurality of touch sensor electrodes is disposed in a peripheral region located outside an image display region.