Display Touch-Detection Electrode Slit Pitch for Moiré Reduction
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Solution Overview
Problem
Display devices with touch detection functions suffer from visible Moire fringes due to the optical interference between the touch detection electrode and the display panel, which affects the color display.
Innovation Solution
The display device incorporates a touch detection electrode pattern with slits oriented differently from the scanning signal lines, with a slit pitch that is a multiple of the pixel pitch, to minimize optical interference and reduce Moire fringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transparent electrode pattern is provided in the touch detection electrode to make it invisible, then the visibility of the touch detection electrode is reduced, but Moire fringes become visible due to optical wavelength differences between light passing through the electrode pattern and light passing through the slit hole pattern
Solution Approach 1:
The patent introduces a new spatial dimension parameter - the slit pitch in the touch detection electrode is set to a specific relationship (multiple or submultiple) with the pixel pitch, creating a hierarchical scaling relationship that resolves the Moire interference problem by aligning the optical interference pattern with the display pixel structure
Solution Approach 2:
The patent changes the critical parameter of slit pitch to specific values (multiples or submultiples of pixel pitch) to transform the optical interference characteristics, thereby eliminating visible Moire fringes while preserving the transparency function of the electrode pattern
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 effectively reduces Moire fringes, enhancing the visual clarity and color accuracy of the display device by minimizing optical interference between the touch detection electrodes and the display panel.
Implementation Method 1
the touch detection device is a capacitive type touch detection device that detects an external proximity object based on a change in capacitance
Implementation Method 2
The touch detection electrode is transparent, but has a predetermined refraction index
Implementation Method 3
stripes (hereinafter, also referred to as 'Moire fringes') of a color shift pattern (color Moire) may become visible
Data Source
AI summary
According to an aspect, a display device with a touch detection function includes: a plurality of pixel electrodes arranged in a matrix; a plurality of scanning signal lines; a drive electrode that faces the pixel electrodes; and a plurality of touch detection electrodes including a detection electrode pattern of a transparent conductive body that faces the drive electrode. The detection electrode pattern includes one or more slits each of which is a region where the transparent conductive body is not present. The slits of the detection electrode pattern of the touch detection electrodes extend in a direction different from an extending direction of the scanning signal lines with a slit pitch having a predetermined interval therebetween in the extending direction of the scanning signal lines. The slit pitch is multiples of a natural number of a predetermined pixel pitch in which the pixel electrodes are arranged.