Vertical Light-Emitting Element Alignment for Front-Emitting Displays
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Solution Overview
Problem
Current display devices face challenges in enhancing display quality due to limitations in light emission directionality and efficiency, leading to suboptimal image clarity and luminance.
Innovation Solution
The proposed display device incorporates a light emitting element with a cylindrical shape and alignment electrodes, where the light emitting element is vertically aligned within an organic layer, allowing direct emission of light to the front of the display panel, eliminating the need for separate reflective members and reducing light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are arranged in a conventional planar configuration, then the device structure is simple, but light emission directionality is poor and display quality deteriorates
Solution Approach 1:
The patent transitions from a conventional planar (2D) arrangement of light emitting elements to a three-dimensional configuration where elements are vertically stacked and aligned along the light emission direction. This dimensional change enables superior light directionality while maintaining structural manageability through the use of alignment electrodes and organic layers that organize the vertical arrangement.
2Illumination intensity
If reflective members are added to improve light emission efficiency, then luminance is enhanced, but device complexity and light loss increase
Solution Approach 1:
The patent removes the need for separate reflective members by directly aligning the light emitting elements vertically so that light is emitted forward without requiring reflection. This extraction of unnecessary components simplifies the device structure while maintaining high luminance efficiency, as light travels directly from the source to the display front without intermediate reflections that would cause energy loss.
Solution Approach 2:
The light emitting elements themselves are configured to provide the directional emission function that would otherwise require separate reflective components. By vertically aligning the elements along the emission direction, the structure serves its own light directionality needs without external assistance, eliminating the need for additional reflective members and reducing overall device complexity.
3Manufacturing precision
If light emitting elements are not vertically aligned, then manufacturing is easier, but color mixing defects occur and image clarity deteriorates
Solution Approach 1:
The patent introduces alignment electrodes and organic layers as intermediary structures that facilitate the vertical alignment of light emitting elements. These intermediaries provide a structured framework that guides element placement and maintains precise alignment during manufacturing, making the alignment process more controllable and less dependent on complex manual positioning techniques.
Data Source
AI summary
A display device includes an alignment electrode that includes a first electrode and a second electrode surrounding the first electrode; a first organic layer disposed on the alignment electrode and including an opening partially exposing the alignment electrode; and a light emitting element provided in the opening of the first organic layer.