Quantum Dot Display Panel Blue Light Conversion for Color Gamut
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Solution Overview
Problem
Current quantum dot-based OLED display devices face limitations in color effect, resolution, and backlight utilization ratio, necessitating improvements in their design and fabrication methods.
Innovation Solution
A quantum dot-based display panel is developed with a substrate, light-emitting devices emitting blue light, and a light conversion layer comprising red, green, and yellow quantum dot layers to convert blue light into red, green, and yellow light, respectively, along with a light transmitting layer to enhance color gamut and brightness, eliminating the need for a blue light filter and optimizing backlight utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots are combined with organic electroluminescent display technology to obtain QD-OLED display devices, then color gamut and luminous efficiency are improved, but resolution and backlight utilization ratio need to be improved
Solution Approach 1:
The patent divides the pixel structure into multiple sub-pixels (red, green, blue, and white sub-pixels) with different light conversion layer configurations. This segmentation allows each sub-pixel to be optimized independently for its specific color output, improving overall display resolution and color precision while maintaining wide color gamut coverage.
Solution Approach 2:
Different light conversion layer structures are applied to different sub-pixels based on their specific requirements. The red and green sub-pixels use quantum dot layers with specific thicknesses and materials optimized for their respective wavelengths, while the white sub-pixel uses a different configuration. This local optimization enables high resolution without compromising color gamut.
2Use of energy by moving object
If quantum dots are combined with organic electroluminescent display technology, then luminous efficiency is improved, but backlight utilization ratio needs to be improved
Solution Approach 1:
The patent extracts and eliminates the blue light filter layer from the traditional OLED structure. By removing this filtering component, blue light emitted by the organic electroluminescent layer is directly utilized without being absorbed and wasted, significantly improving backlight utilization ratio while maintaining high luminous efficiency.
Solution Approach 2:
The organic electroluminescent layer serves multiple functions: it acts as both the light source and the blue light emitter for the white sub-pixel. The quantum dot layers then convert this blue light into red and green wavelengths, creating a multi-functional system that maximizes energy utilization across all color channels.
3Ease of manufacture
If traditional OLED structure with blue light filter is used, then manufacturing process is simplified, but color richness and brightness are limited
Solution Approach 1:
The patent introduces asymmetry in the light conversion layer configuration across different sub-pixels. The red, green, and white sub-pixels have distinct quantum dot layer structures with different materials, thicknesses, and compositions. This asymmetric design enables superior color richness and brightness performance while remaining compatible with existing manufacturing processes through sequential layer deposition.
4Reliability
If blue light filter is included in OLED structure, then device structure is complete, but it limits display brightness and color gamut
Solution Approach 1:
The patent removes the blue light filter component from the device structure, replacing it with a direct blue light emission path. This extraction eliminates the energy loss and brightness limitation imposed by the filter, while the overall device structure remains complete and functional through the alternative white sub-pixel configuration that generates white light without requiring blue light filtering.
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 achieves enhanced color richness, display brightness, and higher resolution by effectively converting blue light into a wide range of colors, simplifying the manufacturing process and improving backlight efficiency.
Implementation Method 1
the first red quantum dot layer is configured to convert blue light emitted by the light-emitting device of the corresponding sub-pixel to red light, the first green quantum dot layer is configured to convert blue light emitted by the light-emitting device of the corresponding sub-pixel to green light
Data Source
AI summary
The present disclosure provides a quantum dot-based display panel, a method and a display device. A pixel of the display panel includes four sub-pixels of R, G, B and W, each of which uses blue light as backlight, both the red sub-pixel and the green sub-pixel include quantum dots, the blue sub-pixel includes a light transmitting layer, and a white sub-pixel includes a yellow light conversion layer. Quantum dots of the yellow light conversion layer are configured to convert a portion of the blue light to yellow light and at the same time transmit the other portion of the blue light such that the obtained yellow light and the transmitted blue light are mixed to form white light. Thereby, R, G, B and W four-color display based on the quantum dots is realized, which enhances the richness of color, display brightness and resolution, the utilization ratio of backlight.