Insulation Layer Width Optimization for Display Touch Sensitivity
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Solution Overview
Problem
Display devices face challenges in maintaining touch sensitivity while improving viewing angle characteristics, as the distance between light emitting areas and the black matrix significantly affects the viewing angle and can lead to reduced touch sensitivity.
Innovation Solution
A display device design featuring a pixel definition layer with openings for light emitting elements, an encapsulation layer, an insulation layer with a smaller width than the pixel definition layer, touch sensing cells, and a black matrix that covers the insulation and touch sensing cells, ensuring the insulation layer does not overlap the light emitting elements to maintain touch sensitivity and enhance viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the distance between light emitting areas and black matrix is increased to improve viewing angle, then viewing angle characteristic is improved, but touch sensitivity is reduced
Solution Approach 1:
The device structure is segmented into distinct functional layers: pixel definition layer with openings for light emitting elements, encapsulation layer, insulation layer with controlled width, and black matrix. This segmentation allows independent optimization of each layer's dimensions and properties, enabling the black matrix to be positioned optimally for viewing angle while maintaining touch sensitivity through proper spacing and insulation layer design.
Solution Approach 2:
The insulation layer is designed with a width smaller than the pixel definition layer, creating different regional properties: the insulation layer provides electrical isolation where needed, while the gaps between insulation layer segments allow touch signals to pass through effectively. This local variation in insulating properties maintains both electrical isolation and touch sensitivity.
2Illumination intensity
If the black matrix width is increased to improve viewing angle, then viewing angle characteristic is improved, but manufacturing complexity increases
Solution Approach 1:
The pixel definition layer with openings is formed first to establish the light emitting element positions. Subsequent layers (encapsulation, insulation, black matrix) are then deposited in sequence, with each layer's pattern predetermined by the layer below. This preliminary structuring simplifies manufacturing by using a bottom-up approach rather than requiring complex simultaneous patterning of all layers.
Data Source
AI summary
A display device includes: a plurality of light emitting elements; a pixel definition layer having a plurality of openings defining positions of the light emitting elements; an encapsulation layer on the light emitting elements and the pixel definition layer; an insulation layer on the encapsulation layer and having a smaller width than a portion of the pixel definition layer between two adjacent openings therein; and a plurality of touch sensing cells on the insulation layer.