Micro LED Retaining Wall Structure for Light Symmetry
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Solution Overview
Problem
Micro LED display substrates face challenges in achieving symmetrical light emission and high forward light outgoing efficiency due to the deviation of the light-emitting layer from the center of the micro LED, leading to uneven light distribution and low contrast.
Innovation Solution
Incorporating an annular retaining wall structure around the micro LEDs on the drive backplate, where the center of the surrounding region of the retaining wall structure is located within the circumscribing region of the light-emitting layer, to correct the light outgoing region and enhance light symmetry and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light-emitting layer is positioned in the micro LED, then light emission function is achieved, but the light-emitting layer center deviates from the micro LED center causing asymmetrical light emission
Solution Approach 1:
The patent introduces a retaining wall structure as an intermediary element between the micro LED and the drive backplate. This retaining wall has a specific geometric configuration (inclined inner annular surface) that acts as a mediator to redirect and symmetrize the light emission. The retaining wall compensates for the positional deviation of the light-emitting layer by refracting and redirecting light rays, thereby achieving symmetrical light emission without requiring precise positioning of the light-emitting layer itself.
2Productivity
If conventional micro LED structure is used, then device simplicity is maintained, but forward light outgoing efficiency is low at 9.49%
Solution Approach 1:
The patent addresses the low light outgoing efficiency by introducing a three-dimensional retaining wall structure with inclined surfaces. This adds a vertical dimension and angular control to the light path management. The inclined inner annular surface of the retaining wall creates multiple light reflection and refraction paths, effectively increasing the forward light outgoing efficiency from 9.49% to 18.79% by redirecting light that would otherwise be emitted in unwanted directions.
3Ease of manufacture
If light-emitting layer center deviates from micro LED center, then manufacturing tolerance is relaxed, but light distribution becomes uneven and contrast decreases
Solution Approach 1:
The patent converts the harmful effect of light-emitting layer deviation into a beneficial feature. Rather than attempting to eliminate the deviation through precise manufacturing, the design embraces the deviation and uses the retaining wall structure to compensate for it. The retaining wall's inclined surface is specifically designed to redirect light rays from the offset light-emitting layer, transforming the asymmetrical emission pattern into a symmetrical one, thereby improving light distribution uniformity while maintaining relaxed manufacturing tolerances.
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 solution improves the symmetry of light emission, increases the forward light outgoing efficiency from 9.49% to 18.79%, and enhances the contrast of the display substrate by converging and directing light effectively.
Implementation Method 1
a material of the retaining wall structure includes a reflective material
Data Source
AI summary
Disclosed are a display substrate and a manufacturing method therefor and a display device thereof. The display substrate includes: a drive backplate, and a plurality of micro LEDs and a retaining wall structure on the drive backplate; wherein a center of a light-emitting layer in the micro LED deviates from a center of the micro LED; the retaining wall structure is of an annular shape; the retaining wall structure corresponds to at least one micro LED in the display substrate; and a center of a surrounding region of the retaining wall structure in the drive backplate is located within a circumscribing region of a region where a light-emitting layer of the at least one micro LED is located.