Display Panel Color Gamut via Quantum Dot Conversion
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Solution Overview
Problem
Organic light emitting diode (OLED) display panels face compromised color gamut due to differing luminance of three-primary colors and luminance decay, requiring complex and costly circuits for compensation.
Innovation Solution
Incorporation of a color conversion layer with quantum dot particles and a reflective sheet to convert blue light into red and green light, optimizing light usage and reducing complexity and cost by employing a TFT array substrate with dopants and a polarizer for improved backlight availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If different OLED materials are used to emit three primary colors, then the display panel can produce full color images, but the color gamut is compromised due to different luminance and luminance decay characteristics
Solution Approach 1:
A color conversion layer is introduced as an intermediary between the blue OLED lighting device and the display output. This layer contains quantum dot particles that convert blue light into red and green light, mediating the light transformation process to achieve accurate color reproduction without requiring separate OLED materials for each primary color.
Solution Approach 2:
The patent utilizes photoluminescence color conversion where quantum dot particles absorb blue light and emit red or green light at specific wavelengths. This color change mechanism enables precise control over the spectral composition of emitted light, achieving wide color gamut without the complexity of multiple OLED material systems.
2Reliability
If circuits are added to compensate for luminance differences and decay, then color gamut is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/electrical compensation system (complex circuits) with an optical solution (color conversion layer). The quantum dot particles passively convert blue light into red and green light through photoluminescence, eliminating the need for active circuit compensation while achieving superior color gamut.
Solution Approach 2:
The color conversion layer performs self-service by automatically converting blue light into the required red and green components through the inherent photoluminescence properties of quantum dots. This passive optical conversion eliminates the need for external compensation circuits, reducing device complexity while maintaining color accuracy.
3Reliability
If circuits are added to compensate for luminance decay, then color gamut is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a cost-effective color conversion layer using quantum dot particles that can be deposited as a thin film. This relatively simple and inexpensive optical layer replaces expensive compensation circuits, achieving improved color gamut at lower manufacturing cost.
4Reliability
If a color conversion layer with quantum dot particles is used to convert blue light, then color gamut and light efficiency are enhanced, but the structure becomes more complex
Solution Approach 1:
The patent merges the color conversion function directly into the display structure by integrating quantum dot particles into a layer between the blue OLED and the output. This consolidation achieves wide color gamut and high light efficiency without adding separate complex subsystems, as the color conversion is embedded within the existing display architecture.
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
Enhances color gamut and light efficiency by effectively converting blue light into desired colors, improving image display quality while simplifying the OLED display panel design and reducing costs.
Implementation Method 1
a color conversion layer with quantum dot particles and a reflective sheet to convert blue light into red and green light
Data Source
AI summary
A display panel includes a lighting device, a color conversion layer, and a reflective sheet. The lighting device at least includes a first lighting part emitting a first light of a first color having a wavelength within the first wavelength range and a second lighting part emitting a second light of the first color having a wavelength within a second wavelength range. The color conversion layer includes a number of bases corresponding to the first lighting part and the second lighting part. The reflective sheet reflects a light having a wavelength within a first wavelength range and lets a light having a wavelength out of the first wavelength range to pass through. The bases corresponding to the first lighting part are doped with a number of quantum dot particles to convert the first light to a third light of a second color.