LED Convergence Surface Structure for Reflective LCD Uniformity
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Solution Overview
Problem
Total reflective LCD display products suffer from poor display uniformity due to the poor collimation effect of current light-emitting diodes, leading to a darker display screen when ambient light is of lower brightness.
Innovation Solution
A light-emitting diode with convergence surfaces on its semiconductor and protective layers is designed to improve collimation by refracting light towards the center, reducing the angle of emergence and enhancing light distribution uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-emitting diodes are used as light sources, then the brightness of the display screen is improved, but the display uniformity deteriorates due to poor collimation effect
Solution Approach 1:
The patent introduces convergence surfaces with curved geometries (convex or concave) on the light-emitting diode structure. These curved surfaces refract and converge the emitted light rays toward a focal point, transforming the divergent light pattern into a more collimated beam. This curvature-based optical design improves the collimation effect while maintaining brightness, thereby resolving the contradiction between illumination intensity and display uniformity.
Solution Approach 2:
The patent modifies the structural parameters of the light-emitting diode by introducing convergence surfaces with specific curvatures (convex or concave) at different locations (first convergence surface on the light-emitting layer, second convergence surface on the protective layer). By changing the geometric parameters of these surfaces, the light emission pattern is optimized to achieve better collimation and uniformity without sacrificing brightness.
2Use of energy by moving object
If total reflective LCD display technology is used, then energy efficiency is improved by eliminating additional backlight sources, but display brightness deteriorates in low ambient light conditions
Solution Approach 1:
The patent integrates light-emitting diodes directly into the display structure, performing the light generation function beforehand rather than relying on external ambient light reflection. The convergence surfaces are designed to pre-collimate the light before it enters the liquid crystal layer, ensuring optimal light distribution and brightness from the source itself, thereby maintaining energy efficiency while improving display brightness in low ambient light conditions.
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 improved collimation effect of the light-emitting diode enhances display uniformity in total reflective LCD products, providing better brightness and uniformity, especially in low ambient light conditions.
Implementation Method 1
the at least one convergence surface includes a surface of the second semiconductor layer away from the light-emitting layer and/or a surface of the first protective layer away from the second semiconductor layer
Data Source
AI summary
A light-emitting diode, a light-emitting substrate, and a display device are provided. The light-emitting diode includes a first semiconductor layer, a light-emitting layer, a second semiconductor layer, and a first protective layer disposed in sequence. The second semiconductor layer is located on a light-emitting surface of the light-emitting layer. The light-emitting diode includes at least one convergence surface, and the at least one convergence surface includes a surface of the second semiconductor layer away from the light-emitting layer and/or a surface of the first protective layer away from the second semiconductor layer.