Micro-LED Lens and Scattering Structure for Uniform Light Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices have limitations in design, luminance, and response speed due to the presence of a backlight unit, while organic light emitting display devices are vulnerable to moisture, affecting their reliability and lifespan. Additionally, there is a need to improve the light efficiency of light emitting diode display devices.
Innovation Solution
A display device comprising a substrate with subpixels, each containing a thin film transistor and a light emitting diode, where a molding portion with a scattering layer and a lens layer is formed on the light emitting diode. The lens layer includes optical lenses arranged linearly and spaced apart to enhance light scattering and extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a backlight unit is used in liquid crystal display devices, then the display can function, but design freedom is limited and luminance and response speed are reduced
Solution Approach 1:
The patent removes the backlight unit from the display structure and replaces it with self-emissive micro-LED elements. Each subpixel contains a light emitting diode that generates light directly, eliminating the need for a separate backlight unit and its associated control structures, thereby improving luminance and response speed while simplifying the overall device architecture
Solution Approach 2:
The display device uses self-emissive light emitting diodes in each subpixel that generate their own light without requiring an external backlight unit. This self-service approach allows each pixel to be independently luminous, improving design freedom, luminance efficiency, and response speed while reducing structural complexity
2Illumination intensity
If organic materials are used in light emitting display devices, then the display can emit light, but the device becomes vulnerable to moisture, reducing reliability and lifespan
Solution Approach 1:
The patent replaces vulnerable organic light-emitting materials with inorganic light emitting diodes that have superior moisture resistance and longer operational lifespan. The micro-LED structure uses stable semiconductor materials that do not degrade from moisture exposure, eliminating the reliability issues associated with organic materials while maintaining light emission capability
Solution Approach 2:
The light emitting diode structure employs composite material layers including semiconductor layers, electrode layers, and protective layers that provide both light emission functionality and moisture barrier properties. This composite structure combines the light-emitting properties of semiconductor materials with the protective properties of encapsulation layers, achieving both illumination and reliability requirements
3Illumination intensity
If conventional light emitting diode structures are used, then the device can emit light, but light efficiency and uniformity are insufficient
Solution Approach 1:
The patent incorporates a lens layer with microlens structures above each light emitting diode. These hemispherical or dome-shaped lenses focus and redirect light emitted from the micro-LEDs, improving light extraction efficiency and uniformity. The curved lens surfaces optimize light distribution across the display area, reducing variations in brightness and enhancing overall light efficiency
Solution Approach 2:
The patent integrates multiple functional layers including the light emitting diode, scattering layer, and lens layer into a unified molding portion structure. This merged structure ensures precise alignment between the light source and optical elements, improving light efficiency by minimizing optical losses and enhancing uniformity by coordinating the functions of all layers within a single integrated component
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 light efficiency and uniformity in light emission, reducing errors in the arrangement of light emitting diodes and optical lenses, thereby enhancing the viewing angle and light collection efficiency compared to traditional structures.
Implementation Method 1
the molding portion includes a scattering layer for scattering light
Implementation Method 2
a lens layer formed on the scattering layer, and the lens layer include a plurality of optical lenses
Data Source
AI summary
A display device includes a substrate with a plurality of subpixels, at least one thin film transistor and at least one light emitting diode formed in each of the plurality of sub pixels on the substrate, and a molding portion formed on each of the light emitting diodes, wherein the thin film transistor and the light emitting diode are electrically connected to each other, and the molding portion includes a scattering layer for scattering light and a lens layer formed on the scattering layer.