Infrared Scattering Layer for Touch Recognition Accuracy
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Solution Overview
Problem
Current display devices face challenges in accurately recognizing touch inputs due to high infrared specular reflectivity, which reduces the recognition rate and accuracy of code patterns, especially when external light and image display light saturate the infrared signals.
Innovation Solution
The implementation of an infrared scattering layer on the touch electrodes and code patterns of the display panel, which scatters infrared light and minimizes reflectivity, allowing for improved recognition of code patterns without complex calculations and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If code patterns are formed using infrared blocking material on touch electrodes, then touch input recognition is enabled, but infrared specular reflectivity increases causing signal saturation and reduced recognition accuracy
Solution Approach 1:
An infrared scattering layer is introduced as an intermediary between the code patterns and the external environment. This layer scatters incident infrared light, preventing direct reflection back to the sensor while allowing the code pattern recognition to function. The scattering layer mediates the conflict by redirecting infrared radiation in multiple directions, reducing specular reflectivity and preventing signal saturation.
Solution Approach 2:
The infrared scattering layer changes the optical parameters of the display panel surface by scattering infrared light. This alters the reflectivity characteristics from specular (mirror-like) to diffuse reflection, changing the direction and intensity distribution of reflected infrared radiation. The parameter change in light scattering behavior reduces the harmful specular component while preserving the code pattern information.
2Measurement precision
If infrared scattering layer is added to reduce specular reflectivity, then code pattern recognition accuracy improves, but device structure becomes more complex
Solution Approach 1:
The infrared scattering layer utilizes porous or particulate materials with specific optical properties that scatter infrared light effectively. By incorporating materials with controlled porosity or particle structures, the layer achieves infrared scattering functionality without requiring complex multi-layer constructions. The porous or particulate nature of the material provides inherent scattering capability while maintaining a relatively simple single-layer structure.
Solution Approach 2:
The infrared scattering layer is formed using composite materials that combine infrared scattering agents with transparent matrix materials. This composite approach allows the layer to simultaneously scatter infrared light while remaining transparent to visible light, achieving dual functionality in a single integrated layer rather than requiring multiple separate layers for different wavelength ranges.
3Reliability
If code patterns cover entire touch electrode surfaces, then recognition reliability improves, but visible light transmittance and image quality deteriorate
Solution Approach 1:
The code patterns are applied locally to specific regions of the touch electrodes rather than covering the entire surface. This local application strategy places infrared-blocking code patterns only where needed for recognition, leaving other areas of the touch electrodes and display panel transparent to visible light. The local quality approach ensures that code pattern functionality is achieved without compromising overall display transparency and image quality.
Solution Approach 2:
The code patterns utilize materials with selective optical absorption characteristics that are opaque to infrared wavelengths but transparent to visible wavelengths. This color or optical property differentiation allows the code patterns to function as infrared blockers while remaining visually invisible or minimally visible, thus maintaining display quality and visible light transmittance while providing reliable touch recognition.
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 the recognition rate and accuracy of touch inputs by reducing infrared specular reflectivity, preventing signal saturation, and simplifying the driving process while maintaining image quality.
Implementation Method 1
an infrared scattering layer disposed on the plurality of touch electrodes and the plurality of code patterns according to an arrangement shape of the plurality of touch electrodes. The infrared scattering layer scatters infrared light incident on or reflected from the plurality of code patterns and the plurality of touch electrodes.
Data Source
AI summary
A display device comprising a display unit that includes a plurality of light emitting areas; a plurality of touch electrodes that sense a touch and that are disposed between the plurality of light emitting areas; a plurality of code patterns that cover a portion of a front surface of at least one of the plurality of touch electrodes with a preset code shape; and an infrared scattering layer disposed on the plurality of touch electrodes and the plurality of code patterns according to an arrangement shape of the plurality of touch electrodes. The infrared scattering layer scatters infrared light incident on or reflected from the plurality of code patterns and the plurality of touch electrodes.