Housing-Integrated Second Electrode for Narrow Frame Touch Detection
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Solution Overview
Problem
Touch detection devices with integrated touch panels face challenges in maintaining detection performance due to the placement of detection electrodes in narrow frame regions, which can lead to degraded performance and increased frame width, affecting the accuracy and reliability of touch input detection.
Innovation Solution
A display device configuration that includes a display panel with first electrodes in the display region, a housing with second electrodes positioned outside the display region to form capacitance, and a driver to supply drive signals, allowing for effective touch detection through mutual and self-capacitance methods without compromising the frame width or detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If detection electrodes are provided in the peripheral region of the substrate, then touch detection function is achieved, but the frame width increases
Solution Approach 1:
The patent extracts the detection electrode from the substrate and relocates it to the housing. Specifically, the detection electrode is formed on the inner surface of the housing, separating it from the substrate's peripheral region. This extraction allows the substrate to maintain its original frame width while still providing touch detection functionality through the housing-integrated electrode.
2Length of stationary object
If detection electrodes are provided on a cover substrate with narrow frame, then the device structure is compact, but the detection electrode area becomes small degrading detection performance
Solution Approach 1:
The patent moves the detection electrode from the two-dimensional plane of the cover substrate to the three-dimensional housing structure. By forming the detection electrode on the inner surface of the housing, the electrode can extend over a larger surface area without increasing the frame width of the cover substrate. This dimensional transition allows sufficient electrode area for good detection performance while maintaining a compact device structure.
3Strength
If a housing is provided to fix the substrate, then structural support is achieved, but the housing degrades detection performance due to stray capacitance
Solution Approach 1:
The patent merges the housing's structural function with the touch detection function by integrating the detection electrode directly into the housing. The housing serves dual purposes: providing structural support and housing the detection electrode. This integration eliminates the need for separate detection components that would add complexity, while the electrode's placement on the housing's inner surface optimizes detection performance by being positioned close to the display surface.
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 enhances touch detection sensitivity and accuracy by utilizing second electrodes outside the display region to form capacitance, reducing stray capacitance and maintaining a narrower frame, thus improving the overall performance of touch input detection.
Implementation Method 1
a second electrode provided to the housing, positioned on an outer side than the display region in planar view and configured to form capacitance between the second electrode and the first electrodes
Data Source
AI summary
A display device includes a display panel, a housing, a second electrode, and a driver. The display panel includes a substrate and a plurality of first electrodes arrayed in a display region of the substrate. The housing has at least a pair of walls facing each other in planar view and is provided with the display panel between the pair of walls. The second electrode is provided to the housing and positioned on the outer side than the display region in planar view and forms capacitance between the second electrode and the first electrodes. The driver supplies a drive signal to the second electrode.