Quantum Dot Display Optical Panel Staining Prevention
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Solution Overview
Problem
Conventional liquid crystal display apparatuses suffer from low light efficiency due to the reduction of light by color filters, leading to suboptimal image quality and potential manufacturing errors causing staining issues.
Innovation Solution
A display apparatus incorporating an organic light-emitting diode and a quantum-dot color conversion layer, along with a light-emitting panel and an optical panel featuring a substrate, color filters, light-blocking layers, and color-converting layers, which convert incident light to enhance color reproduction and brightness while preventing staining through precise layer arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If color filters are used to reproduce colors in liquid crystal display apparatus, then color reproduction is achieved, but light efficiency is reduced by about 1/3 by each color filter
Solution Approach 1:
The patent changes the optical parameters by replacing traditional color filters with a quantum dot color conversion layer that converts blue light to red and green wavelengths. This parameter change in the light conversion mechanism achieves full-color reproduction while maintaining high light efficiency, as quantum dots convert light with minimal loss compared to absorption-based color filters
Solution Approach 2:
The patent substitutes the mechanical/optical system of color filters (which absorb and block light) with a quantum dot photoluminescence system that converts light wavelengths. This substitution replaces the filtering mechanism with a conversion mechanism, achieving the same color reproduction function with significantly improved light efficiency
2Illumination intensity
If quantum-dot color conversion layer is used to improve light efficiency, then brightness and color reproduction are enhanced, but manufacturing process errors may cause staining issues
Solution Approach 1:
The patent segments the color conversion function into separate quantum dot layers for red and green conversion, each with specific wavelength ranges. This segmentation allows independent optimization and quality control of each color channel, reducing the risk of staining from process errors by isolating the conversion functions
Solution Approach 2:
The patent introduces a blue light-emitting OLED as an intermediary light source that excites the quantum dots. This intermediary approach provides uniform excitation across the display area, reducing hot spots and staining issues that may arise from direct backlight illumination of quantum dots
3Manufacturing precision
If multiple layers are added to the optical panel to prevent staining, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the color conversion and light emission functions into a single integrated quantum dot layer structure on the OLED. By combining the blue OLED emission with red and green quantum dot conversion in one stack, the patent achieves staining prevention without requiring separate complex optical paths or multiple discrete components
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 provides high-quality images with improved brightness and color reproduction by effectively utilizing light-emitting diodes and quantum-dot technology, while minimizing manufacturing errors and staining issues.
Implementation Method 1
A quantum dot is excited by incident light and emits light having a longer wavelength than the incident light. Light in a low wavelength band may be used as incident light of the QD-CCL to provide a high-quality image having excellent color reproduction and high brightness.
Implementation Method 2
A display apparatus including an organic light-emitting diode and a quantum-dot color conversion layer
Data Source
AI summary
A display apparatus for providing an image through an array of a plurality of pixels includes: an optical panel which converts light of the light-emitting panel into light of another color or transmit the light of the light-emitting panel. The optical panel includes: a substrate; a plurality of color filters arranged over the substrate; a first light-blocking layer arranged in the non-pixel area; a second light-blocking layer arranged in the non-pixel area and on the first light-blocking layer; and a color-converting layer and a transmission layer each overlapping a corresponding color filter from among the plurality of color filters in a plan view. Each of the first light-blocking layer and the second light-blocking layer defines a plurality of holes corresponding to the plurality of pixels, and a width of a hole of the second light-blocking layer is greater than a width of a hole of the first light-blocking layer.