Touch Screen Panel Reflection-Preventing Film Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch screen panels with integrated optical sensors suffer from reduced optical characteristics and contrast ratio in bright environments due to external light reflection from metal wiring and switching thin-film transistors.
Innovation Solution
A touch screen panel design featuring reflection-preventing films and wiring structures that reduce external light reflection by using films like amorphous indium tin oxide (a-ITO) and metal oxides, strategically positioned to interfere with and absorb external light, thereby improving optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical sensors are formed on the upper substrate of a display panel, then touch sensing function is achieved, but external light is reflected by the optical sensors, switching thin-film transistors, and metal wiring, causing deterioration of optical characteristics and reduced contrast ratio in bright rooms
Solution Approach 1:
A black matrix layer is introduced as an intermediary substance between the optical sensors and the external environment. This black matrix absorbs external light before it can be reflected by the underlying metal wiring and thin-film transistors, thereby eliminating the harmful reflection effect while preserving the touch sensing function of the optical sensors.
Solution Approach 2:
The invention converts the harmful reflection of external light by metal wiring into a beneficial absorption effect by introducing a black matrix layer. The black matrix is specifically designed to absorb the reflected light, transforming the potential harmful reflection into a useful light-absorbing function that improves optical characteristics in bright environments.
2Adaptability or versatility
If a separate touch panel is added to achieve touch sensing, then touch input capability is provided, but the overall thickness of the display device increases and optical characteristics deteriorate
Solution Approach 1:
The invention merges the touch sensing function with the display panel by forming optical sensors directly on the upper substrate of the display panel. This integration eliminates the need for a separate touch panel, thereby reducing the overall thickness of the display device while maintaining full touch input capability through the integrated optical sensing layer.
3Reliability
If metal wiring is used for optical sensors and switching thin-film transistors, then electrical conductivity is achieved, but external light is reflected, causing reduced contrast ratio in bright environments
Solution Approach 1:
A black matrix layer is positioned between the external light source and the metal wiring, acting as an intermediary that absorbs external light before it can reach and reflect off the conductive metal wiring. This allows the metal wiring to maintain its electrical conductivity function while eliminating its harmful light reflection effect, thereby improving contrast ratio in bright environments.
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 minimizes external light reflection, enhancing optical characteristics and maintaining contrast ratio in bright environments, thus improving the usability of touch screen panels.
Implementation Method 1
A first reflection-preventing film is formed on the substrate... forming a sensing wiring above the first gate wiring to be insulated from the first gate wiring and to cross the first gate wiring
Implementation Method 2
strategically positioned to interfere with and absorb external light, thereby improving optical performance
Data Source
AI summary
Provided are a touch screen panel and a method of manufacturing the same. The touch screen panel comprises: a substrate; a first reflection-preventing film formed on the substrate; a first gate wiring formed on the first reflection-preventing film; and a sensing wiring formed above the first gate wiring to be insulated from the first gate wiring and to cross the first gate wiring.