Dummy Electrode Slit Design for Moire Fringe Suppression
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Solution Overview
Problem
Display devices with touch detection functions suffer from visible moire fringes due to differences in light wavelengths passing through transparent electrodes and dummy electrodes, which can shift colors and be recognized at various viewing angles.
Innovation Solution
A display device with a touch detection function is designed, featuring a substrate with a display region, a touch detection electrode, a dummy electrode, and a drive electrode. The dummy electrode is divided by first and second direction slits, including linear slits with different angles, to minimize light wavelength differences and reduce transmittance variations, making the touch detection electrodes invisible and suppressing moire fringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a dummy electrode with the same light shielding property as the touch detection electrode is provided, then the visibility of the touch detection electrode pattern is reduced, but moire fringes are generated due to wavelength differences between light passing through the dummy electrode and light passing through the slit
Solution Approach 1:
The dummy electrode is divided into multiple segments by introducing slits that extend from the edges toward the center. This segmentation creates multiple smaller electrode regions while maintaining the overall light shielding property, and importantly, it allows different regions to have different capacitance values which helps suppress moire fringes
Solution Approach 2:
Different regions of the dummy electrode are given different properties by varying the capacitance values through strategic placement of slits. The slits are positioned to create regions with different capacitance characteristics, allowing local optimization to suppress moire fringes while maintaining overall visibility
2Object-generated harmful factors
If the dummy electrode is finely divided by slits to reduce capacity difference, then moire fringe visibility is suppressed, but the structural complexity of the electrode pattern increases
Solution Approach 1:
The dummy electrode is segmented by slits into multiple regions with different capacitance values. This segmentation is strategically designed to suppress moire fringes while keeping the overall structure relatively simple and manufacturable
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
The solution effectively reduces the visibility of moire fringes and maintains the original color display, ensuring that the touch detection function operates without interfering with the display's color integrity across different viewing angles.
Implementation Method 1
a dummy electrode of the translucent conductor provided in a region where the touch detection electrode is not provided
Implementation Method 2
the dummy electrode comprises: a first direction slit that is a region without the translucent conductor, the first direction slit dividing the dummy electrode so that pieces of the dummy electrode are adjacent to each other in a second direction orthogonal to the first direction
Implementation Method 3
a drive electrode having capacitance with respect to the touch detection electrode
Data Source
AI summary
According to an aspect, a display device with a touch detection function includes: a substrate; a touch detection electrode of a translucent conductor; a dummy electrode of the translucent conductor provided in a region where the touch detection electrode is not provided; and a drive electrode having capacitance with respect to the touch detection electrode. The dummy electrode comprises: a first direction slit dividing the dummy electrode so that pieces of the dummy electrode are adjacent to each other in a second direction; and a plurality of second direction slits each dividing the dummy so that the pieces of the dummy electrode are adjacent to each other in the first direction. The second direction slits include a first linear slit having a first angle and a second linear slit having a second angle different from the first angle.