Touch Panel Display Moire Suppression via Sensor Interval Optimization
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Solution Overview
Problem
Conventional touch-panel-equipped display devices experience deterioration in display quality due to visible sensors, particularly due to moire interference between the touch panel sensors and the display device, which is not effectively addressed by existing solutions.
Innovation Solution
A touch-panel-equipped display device configuration featuring a color filter layer with multiple pixels arranged in a matrix and a sensor pattern layer with electrodes, where the sensor interval and subpixel interval satisfy specific expressions to overlap and minimize color deviation, thereby reducing moire occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are made visible or transparent to enable touch detection, then touch panel functionality is achieved, but display quality deteriorates due to visible sensors and moire interference
Solution Approach 1:
The patent applies parameter changes by precisely controlling the interval between sensors in the sensor pattern layer relative to the subpixel interval in the color filter layer. By setting the sensor interval to satisfy specific mathematical relationships with the subpixel interval, the patent optimizes the spatial parameters to prevent moire interference while maintaining touch detection functionality. This parameter optimization allows the sensors to be effectively invisible or minimally visible, resolving the contradiction between touch functionality and display quality.
2Measurement precision
If sensor interval is reduced to increase touch detection precision, then measurement precision improves, but moire interference increases due to closer sensor spacing
Solution Approach 1:
The patent resolves this contradiction by establishing optimal parameter relationships between the sensor interval and subpixel interval. Rather than simply reducing the sensor interval, the patent defines specific mathematical relationships that allow for sufficiently small sensor intervals to achieve high measurement precision while simultaneously preventing moire interference through proper spatial sampling. This parameter optimization enables both high touch detection precision and suppression of moire effects.
3Length of stationary object
If sensor pattern layer is placed closer to color filter layer to reduce overall thickness, then device compactness improves, but color deviation increases due to overlapping patterns
Solution Approach 1:
The patent addresses this contradiction by optimizing the spatial parameters of the sensor pattern layer, specifically the sensor interval, to satisfy mathematical relationships with the subpixel interval. By carefully controlling these parameters, the patent enables the sensor pattern layer to be positioned closer to the color filter layer (reducing overall thickness) while the optimized parameter relationships prevent excessive color deviation by ensuring proper spatial sampling and minimizing pattern interference.
Data Source
AI summary
A configuration of a touch-panel-equipped display device in which the occurrence of moire can be suppressed is provided. A touch-panel-equipped display device (1) includes: a color filter layer (121) that includes a plurality of pixels (PX) arranged in matrix along a first direction and a second direction that intersect at a right angle; and a sensor pattern layer (1220) that includes a plurality of electrodes (1220) arranged along the second direction at a predetermined sensor interval (SY) and is disposed so as to overlap the color filter layer (121) in a plan view. Each of the plurality of pixels (PX) includes n color filters (121R, 121G, 121B) that transmit light in different wavelength regions from one another, where n represents an integer of 3 or more. The n color filters are arranged at predetermined subpixel intervals (CSFY) along the second direction. The sensor interval (SY) and the subpixel interval (CSFY) satisfy the following expression (1):CFSY×(n×m+1)≤SY≤CFSY×(n×(m+1)−1) (1)where m represents a positive integer.