Hardened Polarizer for Thin Touch Display Scratch Protection
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Solution Overview
Problem
Conventional touch display panels face issues with scratch vulnerability, fragility, and thickness, leading to adhesion defects, light leakage, and reduced touch accuracy due to the use of a cover plate, which hinders the development of light and thin touch display products.
Innovation Solution
A display panel structure incorporating a first polarizer with a pencil hardness of 3H to 9H, arranged at the light-emitting side, and a diffusion or light guide plate with an elastic modulus of at least 68 GPa, eliminating the need for a conventional cover plate and enhancing mechanical strength and touch accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cover plate is added to the outermost layer to provide scratch protection, then the display panel gains sufficient anti-scratch protection and strength, but the device becomes thicker and heavier, and adhesion defects and light leakage occur
Solution Approach 1:
The patent extracts the protective function from the traditional separate cover plate and integrates it into the polarizer layer itself. By enhancing the polarizer's hardness to 3H-9H, the cover plate becomes unnecessary, thereby reducing thickness while maintaining scratch protection.
Solution Approach 2:
The polarizer is given multiple functions: it simultaneously serves as the optical polarization element and the protective scratch-resistant layer. This eliminates the need for a separate cover plate, reducing overall structure thickness while providing both optical function and mechanical protection.
2Strength
If a cover plate is added to prevent breakage, then the display panel gains sufficient strength, but the device becomes heavier and more complex
Solution Approach 1:
The protective function is extracted from the separate cover plate and integrated into the polarizer. The hardened polarizer (3H-9H) provides breakage resistance without the additional weight of a separate cover plate.
Solution Approach 2:
The polarizer and protective cover functions are merged into a single component. The polarizer layer itself is hardened to provide both optical polarization and mechanical strength, eliminating the separate cover plate and reducing overall weight.
3Strength
If a cover plate is added to protect the display panel, then scratch protection is improved, but touch accuracy deteriorates due to dislocation between display and touch points
Solution Approach 1:
By removing the separate cover plate and integrating protection into the polarizer, the patent eliminates the additional interface that causes dislocation between touch and display points, thereby improving touch accuracy while maintaining scratch protection.
4Weight of stationary object
If the display panel is made lighter and thinner, then productivity and portability improve, but scratch vulnerability and fragility increase
Solution Approach 1:
The patent changes the hardness parameter of the polarizer material to 3H-9H, transforming it from a soft optical layer to a hard protective layer. This allows the polarizer to provide scratch resistance while maintaining the lightweight and thin design, eliminating the need for a heavy cover plate.
Data Source
AI summary
A display panel, a touch display panel, and a display device are provided. The touch display panel includes a first polarizer, a liquid crystal cell, and a backlight assembly, wherein a pencil hardness of the first polarizer is not less than 3H and not greater than 9H; the first polarizer is arranged at a side of the liquid crystal cell distal to the backlight assembly.