Touchscreen Panel Mesh Electrodes for Uniform Corner Capacitance
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Solution Overview
Problem
Conventional touch display devices experience reduced touch sensitivity due to undesired differences in capacitance among touch electrodes, which can be attributed to variations in size and shape, particularly in corner areas, leading to inconsistent touch sensing performance.
Innovation Solution
The implementation of a touchscreen panel with patterned mesh-type electrode metals, where dummy metals are strategically placed or omitted to adjust the capacitance ratio, ensuring uniform touch sensitivity across all areas, including rounded corners, by using the same material layer for electrode and dummy metals and varying the ratio of dummy metals based on the location and size of touch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If touch electrodes are disposed with different sizes and shapes in different areas, then the touchscreen panel can cover the entire display area including corners, but undesired differences in capacitance occur among touch electrodes, degrading touch sensitivity
Solution Approach 1:
The patent applies local quality by introducing dummy metals specifically in corner areas where touch electrodes have different sizes and shapes. These dummy metals are electrically disconnected from the touch electrodes and are strategically placed to compensate for capacitance differences only in the corner regions, rather than uniformly across the entire touchscreen panel. This localized approach maintains touch sensitivity in corner areas while preserving the design flexibility of having different electrode sizes and shapes in different areas.
2Reliability
If dummy metals are added to all touch electrodes to uniformize capacitance, then touch sensitivity improves, but the device structure becomes more complex and manufacturing becomes more difficult
Solution Approach 1:
The patent reduces device complexity by applying dummy metals only in corner areas rather than uniformly across all touch electrodes. This localized application simplifies the overall structure while still achieving the goal of uniformizing capacitance differences. The selective placement of dummy metals in corner regions where capacitance differences occur reduces the number of dummy metals needed and simplifies the manufacturing process compared to a universal approach.
3Shape
If corner touch electrodes are made smaller to fit rounded corner areas, then the touchscreen panel can accommodate rounded corners, but capacitance differences between corner and non-corner touch electrodes increase, reducing touch sensing accuracy
Solution Approach 1:
The patent uses dummy metals as a counterweight mechanism to compensate for the capacitance reduction caused by smaller corner touch electrodes. The dummy metals, being electrically disconnected, add parasitic capacitance that counterbalances the capacitance difference between corner and non-corner electrodes. This compensation ensures that the touch sensing accuracy is maintained across the entire panel, including rounded corner areas, by effectively equalizing the capacitance values.
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 enhances touch sensitivity by minimizing capacitance differences, enabling accurate and consistent touch sensing regardless of electrode size, shape, or location, thereby improving the overall performance of touch display devices.
Implementation Method 1
capacitance touch sensing is commonly used to sense a touch and determine touch coordinates using a plurality of touch electrodes disposed on a touchscreen panel, based on a change in capacitance between touch electrodes
Data Source
AI summary
A touch display device and a touchscreen panel. Even in the case in which touch electrodes have different sizes or shapes or a located in different positions, a difference in capacitance is not formed among the touch electrodes. High touch sensitivity can be obtained. The touch display device comprises a plurality of touch electrodes, wherein a first touch electrode of the plurality of touch electrodes occupies a first area and comprises first mesh-shaped electrode metal. The touch display device comprises first dummy metal in a same layer as the first mesh-shaped electrode metal and in the first area occupied by the first touch electrode, the first dummy metal being electrically disconnected from the first mesh-shaped electrode metal.