Touch Sensor Stack Thickness for OLED Contrast Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch panel display devices experience reduced contrast between black and white displays, particularly under high-temperature and high-humidity conditions, and are prone to performance deterioration.
Innovation Solution
The touch panel display device is configured with a touch sensor having an acrylic substrate thickness of 40 μm or less and a second pressure-sensitive adhesive layer thickness of 100 μm or less, utilizing polymethyl methacrylate and fine metal wires with specific dimensions and patterns, to minimize light scattering and reflection, thereby enhancing contrast and moisture-heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional touch sensor structure is used, then the device can be manufactured with standard materials, but the contrast between black and white displays deteriorates, especially in high-temperature and high-humidity environments
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the acrylic substrate (40 μm or less) and the second pressure-sensitive adhesive layer (100 μm or less). This parameter optimization reduces light scattering and reflection, thereby improving contrast while maintaining performance stability in extreme environments.
Solution Approach 2:
The patent uses composite materials by combining the acrylic substrate with polymethyl methacrylate and specific pressure-sensitive adhesive layers. This composite structure minimizes optical interference and enhances both contrast and environmental resistance.
2Illumination intensity
If the acrylic substrate thickness is reduced to 40 μm or less, then light scattering is minimized and contrast is improved, but the structural strength may be compromised
Solution Approach 1:
The patent compensates for the reduced thickness by using composite material structures with optimized adhesive layers, maintaining structural integrity while achieving the desired thinness for improved contrast performance.
3Illumination intensity
If the second pressure-sensitive adhesive layer thickness is reduced to 100 μm or less, then light transmission is improved and contrast is enhanced, but the bonding strength may be insufficient
Solution Approach 1:
The patent optimizes the thickness parameter of the second pressure-sensitive adhesive layer to 100 μm or less, which balances light transmission requirements for contrast improvement with sufficient bonding strength through material selection and interface design.
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 configuration significantly improves contrast between black and white displays and maintains high performance in extreme environments, reducing brightness increase in black displays adjacent to white displays and suppressing contrast reduction.
Implementation Method 1
a first pressure-sensitive adhesive layer; a touch sensor; a second pressure-sensitive adhesive layer
Data Source
AI summary
An object of the present invention is to provide a touch panel display device that has excellent contrast between black display and white display in a case of black-and-white display and has excellent performance of suppressing a decrease in contrast in a high-temperature and high-humidity environment.A touch panel display device according to an aspect of the present invention is a touch panel display device including a cover member, a first pressure-sensitive adhesive layer, a touch sensor, a second pressure-sensitive adhesive layer, and an organic electroluminescence display panel in this order, in which the touch sensor has an acrylic substrate, a thickness of the acrylic substrate is 40 μm or less, and a thickness of the second pressure-sensitive adhesive layer is 100 μm or less.