Input Sensor Layer Structure for Durable Low-Reflectance Displays
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Solution Overview
Problem
Existing display devices face issues with light-emission efficiency and external light reflectance due to conductors in input sensors, which affect durability and impact resistance.
Innovation Solution
A display device design featuring a sensor insulating layer with organic and inorganic materials, a protective layer made of inorganic material, and a specific layer structure that includes a sensor conductive layer and insulating layers to enhance durability and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductors are used in input sensors, then input sensing function is achieved, but light-emission efficiency deteriorates and external light reflectance increases
Solution Approach 1:
The patent extracts the harmful reflective properties from the conductor surfaces by replacing traditional metal conductors with transparent conductive materials. This extraction of harmful reflection while maintaining conductivity function resolves the contradiction between input sensing capability and light-emission efficiency.
Solution Approach 2:
The patent changes the optical parameters of the conductor materials by using transparent conductive oxides (TCO) with specific optical properties. By adjusting the transparency and reflectance parameters of the conductive layer, the patent maintains electrical functionality while improving light emission and reducing external light reflection.
2Reliability
If conductors are used in input sensors, then input sensing function is achieved, but durability and impact resistance deteriorate
Solution Approach 1:
The patent uses composite material structures for the input sensor layers, combining transparent conductive oxides with protective insulating layers. This composite approach provides both the necessary electrical conductivity for sensing and enhanced mechanical durability and impact resistance.
Solution Approach 2:
The patent applies different material properties to different layers: the conductive layer provides electrical functionality while the protective insulating layers provide mechanical strength and durability. This local differentiation of material qualities resolves the contradiction between sensing function and structural durability.
3Strength
If protective layers are added to improve durability, then impact resistance improves, but device complexity increases
Solution Approach 1:
The patent designs the protective insulating layers to serve multiple functions simultaneously: electrical insulation, mechanical protection, and optical transparency. This multi-functionality reduces the need for separate dedicated protective layers, thereby limiting the increase in device complexity while maintaining impact resistance.
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels; and an input sensor on the display panel, wherein the input sensor includes: a first sensor insulating layer on the display panel; a sensor conductive layer on the first sensor insulating layer and including a plurality of conductive patterns; a second sensor insulating layer configured to cover each of the plurality of conductive patterns and including an organic material; and a protective layer on the second sensor insulating layer and including an inorganic material.