Micro-LED Prism Void Structure for Astigmatism Control
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Solution Overview
Problem
Current silicon-based micro light-emitting diode display devices suffer from poor display effects due to astigmatism caused by different shapes of prisms in different directions, leading to third-order aberration and chromatic aberration.
Innovation Solution
A micro light-emitting diode display panel is designed with a prism layer that includes a void surrounding the light-emitting chip, arranged axially symmetrically with respect to the chip's center line. This configuration ensures equal distances between the light-emitting chip and the void in transverse and oblique directions, allowing for symmetrical reflection of light rays and alignment with tangential or sagittal focal planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a prism is disposed on the light-emitting chip to control light pattern, then the light pattern can be controlled, but the prism has different shapes in transverse and oblique directions causing astigmatism and third-order aberration
Solution Approach 1:
The patent applies asymmetry principle by intentionally designing the void shape in the prism layer to be asymmetric (different curvature radii in transverse and oblique directions) to compensate for the asymmetric light emission characteristics of the light-emitting chip. This asymmetric void configuration corrects the astigmatism and third-order aberration caused by the original symmetric prism structure, thereby improving display effect quality while maintaining light pattern control capability
Solution Approach 2:
The patent changes the geometric parameters of the void in the prism layer, specifically setting different curvature radii for the void in transverse and oblique directions. By adjusting these parameters (first curvature radius in transverse direction, second curvature radius in oblique direction), the optical path is optimized to eliminate astigmatism and aberration, resolving the contradiction between light pattern control and display quality
2Shape
If subpixels are arranged with different spacing in transverse and oblique directions, then the prism must have different shapes in different directions, but this results in astigmatism and affects display effect
Solution Approach 1:
The patent uses asymmetry by designing the void with different curvature radii in transverse and oblique directions to match the asymmetric subpixel arrangement. This asymmetric void configuration compensates for the different spacing between subpixels in different directions, preventing astigmatism while maintaining the adapted prism shape for different directions
Solution Approach 2:
The patent applies local quality principle by creating a void with spatially varying curvature characteristics - the curvature radius changes differently in transverse versus oblique directions. This local variation in the void geometry precisely compensates for the local differences in subpixel spacing, eliminating astigmatism while preserving the direction-specific prism shape adaptation
3Manufacturing precision
If the inclined plane formed by light-emitting chip and prism differs from tangential and sagittal focal planes, then third-order aberration occurs, but correcting this requires complex prism design
Solution Approach 1:
The patent extracts the correction function from the prism structure itself by introducing a separate void element within the prism layer. Instead of making the prism structure itself complex to correct third-order aberration, the patent separates the correction mechanism into a distinct void configuration with specific curvature radii, simplifying the overall prism design while achieving focal plane alignment
Solution Approach 2:
The patent introduces the void as an intermediary element between the light-emitting chip and the external environment. This void acts as a mediator that corrects third-order aberration by its specific geometric configuration, allowing the prism to maintain a simpler structure while still achieving proper focal plane alignment through the intermediary correction mechanism
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 effectively prevents astigmatism by ensuring symmetrical light ray reflection and alignment with focal planes, thereby improving the display effect by reducing aberrations and crosstalk between sub-pixels.
Implementation Method 1
allowing for symmetrical reflection of light rays and alignment with tangential or sagittal focal planes
Data Source
AI summary
A micro light-emitting diode display panel and a micro light-emitting diode display device. A prism layer is provided with a void, which surrounds a light-emitting chip and is arranged axially symmetrically with respect to a center line of the light-emitting chip. Therefore, a distance between the light-emitting chip and the void in a transverse direction is equal to a distance between the light-emitting chip and the void in an oblique direction, and an angle at which a light ray emitted from the light-emitting chip is reflected at a contact surface between the prism layer and the void in the transverse direction is same as an angle at which a light ray emitted from the light-emitting chip is reflected at the contact surface in the oblique direction. Accordingly, a plane formed by the light-emitting chip and the contact surface is same as a tangential focal plane or a sagittal focal plane.