Multilayer Reflection Reducing Unit for Display Devices
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Solution Overview
Problem
Display devices with integrated touch sensor units face challenges in minimizing thickness and maintaining image quality, especially under outdoor conditions with external light reflection and varying viewing angles.
Innovation Solution
A display device design incorporating a touch sensing electrode with mesh shape and patterned metal layers, a multilayer reflection reducing unit, and an encapsulation unit with inorganic and organic layers, which includes a transparent adhesive layer and a cover window to ensure consistent light transmittance across viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch sensor unit is embedded in the display device, then the touch detecting function is added, but the thickness increases
Solution Approach 1:
The touch sensor unit is integrated into the display device structure by forming the touch sensing electrode on the same substrate as the display unit, with both units sharing common layers such as the encapsulation unit and buffer layer. This merging approach adds touch functionality while minimizing additional thickness.
Solution Approach 2:
The touch sensor unit is nested within the display device structure, where the touch sensing electrode is positioned on the encapsulation unit of the display unit. The encapsulation unit serves as a shared boundary layer, allowing the touch sensor to be embedded without significantly increasing overall thickness.
2Object-affected harmful factors
If external light reflection is reduced to improve outdoor visibility, then outdoor visibility is improved, but light transmittance may be affected
Solution Approach 1:
The reflection reducing unit is constructed as a multilayer composite structure with alternating metal layers and dielectric layers. Each layer has specifically selected optical properties (refractive indices and thicknesses) that work together to reduce external light reflection through destructive interference while maintaining high transmittance of emitted light from the display.
Solution Approach 2:
The optical parameters of the reflection reducing unit layers are precisely controlled, including the thickness of each metal and dielectric layer, and their refractive indices. By adjusting these parameters, the unit achieves optimal performance in reducing external light reflection across different viewing angles while preserving light transmittance.
3Adaptability or versatility
If the viewing angle is widened, then viewing angle is improved, but luminance is reduced causing image quality change
Solution Approach 1:
The multilayer composite structure of the reflection reducing unit, with alternating metal and dielectric layers of specific thicknesses and refractive indices, is designed to maintain consistent optical performance across wide viewing angles. This composite structure prevents luminance reduction that typically occurs when widening viewing angles in conventional displays.
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 design enhances outdoor visibility by reducing external light reflection and maintains image quality across wide viewing angles without luminance reduction, ensuring minimal change in image quality.
Implementation Method 1
a reflection reducing unit at the pixel and the non-pixel area on the encapsulation unit and configured as a multilayer of a metal layer and a dielectric layer
Implementation Method 2
an encapsulation unit configured to seal the display unit
Data Source
AI summary
Provided is a display device including: a display unit including a pixel and a non-pixel area; an encapsulation unit configured to seal the display unit; a touch sensing electrode at the non-pixel area on the encapsulation unit and provided with a plurality of first openings; and a reflection reducing unit at the pixel and the non-pixel area on the encapsulation unit and configured as a multilayer of a metal layer and a dielectric layer. The metal layer includes a non-pixel portion overlapping the touch sensing electrode and provided with a plurality of second openings.