Touch-Control Photosensitive Structure Preventing Red Light Leakage
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Solution Overview
Problem
Conventional touchscreens suffer from red light leakage due to the reflective properties of metallic surfaces, which cause the screens to appear reddish, despite having metal layers to reduce impedance and stabilize voltage.
Innovation Solution
A touch-control photosensitive structure with a metal substrate, insulating layer, photosensitive layer comprising alternating red, green, and blue blocks, a third metal layer, and a transparent conductive layer, where a light absorption layer is applied on the third metal layer to absorb reflecting light, specifically designed to prevent red light leakage without affecting impedance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal layer is added to reduce impedance, then electrical performance is improved, but red light leakage occurs due to light reflection
Solution Approach 1:
The patent converts the harmful reflective property of metal into a beneficial feature by using the metal layer's reflection to direct light toward the light absorption layer. The metal substrate and third metal layer reflect light downward to the light absorption layer, which is specifically designed to absorb red light wavelengths, thereby converting the harmful reflection into a useful light-trapping mechanism that prevents red light leakage.
Solution Approach 2:
The light absorption layer acts as an intermediary between the metal layers and the external environment. This intermediate layer receives reflected light from the metal substrate and third metal layer, absorbs the red light wavelengths, and prevents them from leaking out, thus mediating between the electrical performance requirement (metal layers) and the light leakage problem.
2Illumination intensity
If blue and green light are absorbed through reflection, then color balance is improved, but red light continues to leak due to its longer wavelength
Solution Approach 1:
The light absorption layer is designed with local quality specific to red light wavelengths. Rather than using a uniform absorption mechanism for all wavelengths, the patent applies a specialized light absorption layer that specifically targets and absorbs red light wavelengths, which have the longest wavelength and are least absorbed by conventional reflective surfaces. This localized absorption property solves the red light leakage problem while maintaining overall color balance.
Solution Approach 2:
The patent addresses the wavelength-dependent absorption issue by changing the optical parameters of the light absorption layer to match the red light wavelength range. The light absorption layer is engineered with specific optical properties that enable it to absorb red light effectively, compensating for the fact that red light with its longer wavelength is not readily absorbed by standard reflective surfaces that work for blue and green light.
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
Effectively prevents red light leakage while maintaining low impedance and stable voltage, ensuring the touchscreen appears color-neutral and maintains efficient electrical performance.
Implementation Method 1
a light absorption layer is disposed on the lower surface of the third metal layer, with the light absorption layer adapted to absorb a reflecting light otherwise reflecting off the metal substrate and the third metal layer and propagating therebetween
Data Source
AI summary
A touch-control photosensitive structure for preventing red light leakage includes a metal substrate, an insulating layer, a photosensitive layer, a third metal layer and a transparent conductive layer. The insulating layer is disposed on the metal substrate. The photosensitive layer is disposed on the insulating layer. The photosensitive layer at least comprises red photosensitive blocks, green photosensitive blocks and blue photosensitive blocks, arranged alternately. A junction region is disposed at the junction of the photosensitive blocks in different colors. The third metal layer is disposed on the junction region. The third metal layer has a lower surface which a light absorption layer is disposed on. The light absorption layer absorbs a reflecting light otherwise reflecting off the metal substrate and the third metal layer and propagating therebetween. The transparent conductive layer is disposed on the third metal layer. The third metal layer reduces impedance of the transparent conductive layer efficiently and thereby renders public voltage stable. The light absorption layer absorbs the reflecting light and thereby prevents light leakage.