Vertical Light-Emitting Element Alignment for Color-Pure Displays
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Solution Overview
Problem
Current display devices face challenges in enhancing light emission efficiency due to limitations in the design and manufacturing methods of light emitting elements, particularly in aligning and integrating these elements within the display structure.
Innovation Solution
A display device design that includes a light emitting element with a specific semiconductor layer stack and insulating layers, where the light emitting element is aligned vertically between electrodes, and a second pixel electrode is formed on the insulating layer to improve light emission efficiency and prevent color mixture between sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional light emitting elements are used with traditional alignment methods, then manufacturing process complexity is reduced, but light emission efficiency is insufficient and color mixture occurs between sub-pixels
Solution Approach 1:
The patent introduces an intermediary alignment structure comprising a lower alignment electrode and an upper alignment electrode that generate an electric field to align the light emitting element vertically. This intermediary mechanism mediates between the pixel electrode and the light emitting element, achieving precise alignment without complex external alignment facilities while improving light emission efficiency and preventing color mixture.
2Manufacturing precision
If external alignment facilities are used to position light emitting elements, then alignment precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent implements a self-service alignment mechanism where the alignment electrodes integrated into the display device itself generate electric fields to automatically align the light emitting elements during operation. This eliminates the need for external alignment facilities, achieving high alignment precision while simplifying the overall device structure and reducing manufacturing complexity.
3Reliability
If light emitting elements are not vertically aligned, then manufacturing process is simpler, but color mixture occurs between sub-pixels reducing image quality
Solution Approach 1:
The patent addresses color mixture by introducing vertical alignment in the third dimension (depth direction). The lower and upper alignment electrodes create an electric field that positions the light emitting element vertically between the sub-pixels, preventing lateral light leakage and color mixture. This vertical dimension control significantly improves image quality and color purity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed solution enhances light emission efficiency by vertically aligning the light emitting element, reducing color mixture and improving image quality, while simplifying the manufacturing process by eliminating the need for external alignment facilities.
Implementation Method 1
a light emitting element disposed in the opening and including a first end portion electrically contacting the first pixel electrode and a second end portion
Implementation Method 2
color conversion particles disposed on the second pixel electrode, the color conversion particles converting a wavelength band of light emitted from the light emitting element
Data Source
AI summary
A display device includes a first pixel electrode disposed on a base layer, a first insulating layer disposed on the first pixel electrode and including an opening exposing the first pixel electrode, a first electrode and a second electrode disposed on the first insulating layer and spaced apart from each other with the opening disposed between the first electrode and the second electrode, a light emitting element disposed in the opening and including a first end portion electrically contacting the first pixel electrode and a second end portion, a second insulating layer covering the first insulating layer, the first electrode, and the second electrode and exposing the second end portion of the light emitting element, and a second pixel electrode disposed on the second insulating layer and electrically contacting the second end portion of the light emitting element.