Display Device Recessed Light-Emitting Layer Aperture Ratio
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Solution Overview
Problem
Conventional display device configurations with three banks for light-emitting layers of primary colors result in a lower aperture ratio due to the increased area required for the banks, reducing the efficiency of light emission.
Innovation Solution
A display device design featuring a substrate with an insulating film having recesses, where the first pixel electrode is formed on the upper surface and the first light-emitting layer overlaps it, and the second light-emitting layer is formed in the recess of the insulating film, enhancing the aperture ratio and simplifying the manufacturing process by eliminating the need for evaporation or photolithography steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If three banks are used for light-emitting layers of three primary colors, then the light-emitting layers can be formed, but the aperture ratio of the display unit decreases
Solution Approach 1:
The patent transitions from a planar arrangement of light-emitting layers to a three-dimensional structure by forming a recess in the insulating film. The second light-emitting layer is positioned in the recess at a lower level than the first light-emitting layer, utilizing the vertical dimension to increase the aperture ratio while maintaining proper formation of all light-emitting layers.
2Manufacturing precision
If conventional bank structures are used, then light-emitting layers can be formed, but the manufacturing process becomes complex requiring evaporation or photolithography steps
Solution Approach 1:
The patent extracts and eliminates the complex evaporation or photolithography steps from the manufacturing process. Instead, it uses a simplified approach where the second light-emitting layer is formed in the recess through direct deposition or printing methods, significantly reducing manufacturing process complexity while maintaining light-emitting layer formation quality.
Data Source
AI summary
A display device includes a substrate, an insulating film formed over the substrate, a first pixel electrode formed over the insulating film, a first light-emitting layer formed over the first pixel electrode and overlapping the first pixel electrode in a plan view, a second light-emitting layer formed in a recess provided in the insulating film, and a second pixel electrode overlapping the recess in a plan view. At least one of the first light-emitting layer and the second light-emitting layer includes a quantum dot as a light-emitting material.