Micro Display Pixel With Inclined Side Surfaces
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Solution Overview
Problem
Conventional micro-display pixel structures face manufacturing difficulties due to the need for large space between sub-pixels and challenges in repairing defective pixels, and they suffer from reduced light emission efficiency due to light leakage through side surfaces.
Innovation Solution
A micro-display pixel structure with sub-pixels of blue, green, and red light emitting diodes stacked vertically, featuring inclined side surfaces to reflect light internally and minimize side emission, along with current blocking layers to manage leakage current, and a via hole for heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels are arranged in a conventional planar structure, then the manufacturing process requires large space and complex transfer processes, but the light emission efficiency is reduced due to side surface light leakage
Solution Approach 1:
The patent transitions from a conventional planar arrangement of sub-pixels to a vertically stacked three-dimensional structure. This dimensional change allows sub-pixels to be arranged in the vertical direction rather than horizontally, reducing the occupied area and eliminating the need for complex transfer processes while maintaining high light emission efficiency through the inclined side surfaces
Solution Approach 2:
The patent converts the harmful effect of side surface light leakage into a beneficial reflection mechanism by introducing inclined side surfaces with specific inclination angles. The inclined surfaces cause light that would normally leak sideways to be reflected back toward the front surface, transforming energy loss into useful light output and improving overall emission efficiency
2Reliability
If sub-pixels are positioned with large space between them, then light leakage between pixels is prevented, but the occupied area increases and manufacturing becomes challenging
Solution Approach 1:
By stacking sub-pixels vertically in the third dimension, the patent eliminates the need for horizontal spacing between pixels. The vertical arrangement allows pixels to be densely packed in the planar view while maintaining effective light isolation through the inclined side surfaces that reflect light back toward the front
Solution Approach 2:
The inclined side surfaces convert potential light leakage into beneficial light reflection. Instead of allowing light to escape sideways and be absorbed by black matrices, the inclined surfaces reflect the light back toward the front viewing direction, improving efficiency while allowing tighter pixel spacing
3Reliability
If black matrix is introduced to prevent light leakage, then light isolation between pixels is improved, but light emission efficiency is reduced due to absorption of side-emitted light
Solution Approach 1:
The patent replaces the black matrix absorption mechanism with an active reflection mechanism using inclined side surfaces. Instead of allowing the black matrix to absorb side-emitted light and convert it to heat, the inclined surfaces reflect this light back toward the front surface, converting what would be energy loss into useful light output for viewing
Solution Approach 2:
The patent extracts and removes the black matrix component from the pixel structure. By eliminating the black matrix and replacing its light isolation function with inclined side surfaces, the design reduces material usage and converts the previously harmful absorbed light into beneficial reflected light, improving overall system efficiency
4Ease of manufacture
If conventional planar pixel structure is used, then manufacturing is straightforward, but repair of defective pixels is difficult and transfer process is complex
Solution Approach 1:
The vertical stacking architecture allows defective sub-pixels to be accessed and replaced from the vertical direction. Each sub-pixel can be independently manipulated in the vertical stack, enabling easier repair and replacement operations compared to planar arrangements where defective pixels are embedded in a two-dimensional array requiring complex disassembly
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 structure enhances light emission efficiency in the vertical direction, simplifies the manufacturing process, and facilitates easier repair of defective pixels by reducing the occupied area and minimizing side light emission.
Implementation Method 1
when light generated in one of the sub-pixels is incident on the inclined surface, the light is reflected
Data Source
AI summary
Disclosed is a unit pixel of a micro-display capable of minimizing light emitted through a side surface. A side surface of the unit pixel having a vertically stacked pixel structure is etched and has inclination angle. Light directed toward the side surface is reflected by the side surface inclined at an angle, and the light is emitted in a direction perpendicular to the growth surface or the surface of the growth substrate.