Touch Control Panel Insulating Layer Refraction for OLED Viewing Angle
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Solution Overview
Problem
Flexible OLED displays suffer from limited viewing angles and chromaticity deviations due to light-shading properties of metal mesh touch sensing units, which further restrict the viewing angle range, making it challenging to maintain image quality when viewed from the side.
Innovation Solution
An insulating layer with a different elastic modulus than adjacent inorganic or organic layers is arranged between the first and second metal layers, creating uneven contact surfaces that refract light at different angles, thereby increasing the viewing angle range of OLED displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a metal mesh touch sensing unit is integrated on the OLED display, then the touch control function is achieved, but the viewing angle range is further affected due to light-shading property
Solution Approach 1:
An insulating layer with different elastic modulus is introduced as an intermediary between the first and second metal layers. This intermediary layer creates a lumpy contact surface that refracts light, thereby mitigating the light-shading effect of the metal mesh while preserving the touch control function.
Solution Approach 2:
The elastic modulus of the insulating layer is specifically controlled to be different from that of the metal layers. This parameter change creates the desired lumpy surface morphology that refracts light effectively, resolving the contradiction between touch functionality and viewing angle performance.
2Device complexity
If light is emitted linearly upward from the EL layer, then the display structure is simple, but the viewing angles of brightness and chromaticity are limited
Solution Approach 1:
The contact surface between the metal layers is transformed from a flat plane to a lumpy curved surface through the insulating layer. This curvature enables light to refract at multiple angles, expanding the viewing angle range while maintaining the overall simplicity of the display structure.
3Ease of manufacture
If the contact surface between metal layers is flat, then the manufacturing process is simple, but light refraction at different angles does not occur
Solution Approach 1:
The insulating layer is applied locally between the metal layers to create a lumpy contact surface. This local modification introduces light refraction capability without requiring complete restructuring of the entire manufacturing process, thus maintaining ease of manufacture while achieving the desired optical effect.
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 enhances the viewing angle range of OLED displays by refracting light at varying angles, improving image quality when viewed from wider angles without compromising display performance.
Implementation Method 1
When light emitted by an EL layer reaches the lumpy contact surface, refraction of different angles occurs, which thereby increases a range of viewing angles of OLEDs.
Data Source
AI summary
The present invention provides a touch control panel and a manufacturing method thereof. The present invention, by arranging an insulating layer with elastic modulus different from an adjacent inorganic layer or organic layer between a first metal layer and a second metal layer, makes their contact surfaces uneven. When light emitted by an electroluminescent (EL) layer reaches the uneven contact surfaces, refraction of different angles occurs, thereby increasing a viewing angle range of organic light-emitting diodes (OLEDs).