Pixel Electrode Edge-Cover Structure for Uniform Light Emission
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Solution Overview
Problem
Existing display device manufacturing methods result in non-uniform thickness of the organic active layer, leading to non-uniform light emission intensity and potential current concentration, which can cause premature deterioration.
Innovation Solution
A display device design featuring a substrate with pixel electrodes having protruding and recessed portions, edge covers, and a counter electrode configuration, along with a manufacturing method that includes forming a light-emitting layer across these portions and using edge covers to ensure uniform thickness and prevent current concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a liquid material is applied to the valid portion of the underlayer to form a coating layer, then thinning of the peripheral portion of the organic active layer can be suppressed, but the thickness of the side edge portion of the light-emitting layer on the central portion cannot be made uniform, causing current concentration
Solution Approach 1:
A protruding portion is formed on the underlayer at the position where the light-emitting layer will be formed. This preliminary structural preparation ensures that when the liquid material is applied, the protruding portion guides the material to form a uniform thickness light-emitting layer across the entire valid portion including side edge portions, preventing current concentration and ensuring uniform light emission.
2Ease of manufacture
If the thickness of the organic active layer is non-uniform, then current concentrates on thinned portions, but this causes premature deterioration and non-uniform light emission
Solution Approach 1:
The protruding portion is formed in advance on the underlayer before applying the liquid material. This preliminary structure controls the flow and distribution of the liquid material during coating, ensuring uniform thickness of the light-emitting layer without requiring complex coating processes, thus maintaining ease of manufacture while preventing current concentration and improving device reliability.
Data Source
AI summary
A display device includes: a substrate; a pixel electrode disposed on the substrate, the pixel electrode including a first portion and a second portion disposed outside the first portion, the first portion protruding to a second side opposite to a first side closer to the substrate than the second portion; a light-emitting layer disposed across the second side of the first portion and the second side of the second portion; a first edge cover disposed across the second side of a side edge portion of the first portion and the second side of the second portion, the first edge cover including an opening formed on the second side of a central portion of the first portion, the first edge cover covering an edge of the first portion; and a counter electrode including a portion disposed closer to the second side than the first edge cover.