Display Device With Localized Encapsulation Thickness
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Solution Overview
Problem
Existing display devices face challenges in reducing thickness while maintaining high light emitting efficiency and front brightness, particularly due to the thickness of the thin-film encapsulation layers and the configuration of sensing electrodes.
Innovation Solution
The display device incorporates a substrate with a pixel, a thin-film encapsulation layer, a cover layer, and a sensing part, where the sensing part is disposed as a single layer on the cover layer, connected to a connection electrode through a contact hole, and the thickness of the second inorganic encapsulation layer on the connection electrode is smaller than on the pixel, optimizing the structure to reduce thickness and enhance light emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a thin-film encapsulation layer is used to reduce thickness, then the overall device thickness is reduced, but light emitting efficiency and front brightness deteriorate
Solution Approach 1:
The encapsulation layer is designed with varying thickness: a first thickness in the light-emitting region and a second thickness in the non-light-emitting region, where the first thickness is less than the second thickness. This local quality variation allows the light-emitting region to have reduced thickness for better light transmission and brightness, while the non-light-emitting region maintains greater thickness for adequate protection and structural integrity.
2Illumination intensity
If the encapsulation layer thickness is reduced to enhance light emitting efficiency, then front brightness is improved, but protective function and structural integrity worsen
Solution Approach 1:
The encapsulation layer implements different thickness values for different functional regions: a thinner first thickness over the light-emitting region to maximize light transmission and efficiency, and a thicker second thickness over the non-light-emitting region to provide sufficient mechanical protection and structural support. This spatially differentiated design resolves the contradiction between light emitting efficiency and protective function.
3Measurement precision
If sensing electrodes are configured in multiple layers, then sensing coverage is improved, but device thickness increases
Solution Approach 1:
The sensing electrodes are configured as a single layer rather than multiple layers, which reduces the overall device thickness while still providing adequate sensing coverage through optimized electrode patterns and material properties within the single layer structure.
Data Source
AI summary
A display device includes a substrate, a pixel disposed on the substrate, a thin-film encapsulation layer disposed on the pixel, a cover layer disposed on the thin-film encapsulation layer and in which an opening is defined, and a sensing part disposed on the cover layer. A recess part may be defined on an upper surface of the thin-film encapsulation layer overlapping the opening.