Quantum Dot Display Panel Layout for Higher Excitation Light Use
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The utilization rate of excitation light is insufficient, and there is a problem of low conversion efficiency of front brightness in photoluminescence quantum dot display products.
Innovation Solution
A display panel design featuring double-layer light-emitting devices and photoluminescent layers, with the first light-emitting devices and photoluminescent layers arranged in alternating layers, and a pixel definition layer that includes a light transmissive material to avoid overlap and enhance light extraction, combined with reflective parts to redirect unused light to the second photoluminescent layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If photoluminescence quantum dot technology is used in display products, then wide color gamut is achieved, but utilization rate of excitation light is insufficient
Solution Approach 1:
The patent transitions from a single-layer photoluminescent quantum dot structure to a dual-layer structure with first and second photoluminescent quantum dot layers arranged at different positions. The first layer converts excitation light to first wavelength light, while the second layer converts remaining excitation light to second wavelength light, effectively utilizing excitation light that would otherwise be wasted and achieving both wide color gamut and high light utilization efficiency
Solution Approach 2:
The patent divides the single photoluminescent quantum dot layer into two separate layers: a first photoluminescent quantum dot layer and a second photoluminescent quantum dot layer. Each layer is positioned at different locations relative to the light-emitting element, with the first layer closer to the light-emitting element and the second layer farther away. This segmentation allows different portions of excitation light to be converted at different layers, improving overall light utilization
2Illumination intensity
If photoluminescence quantum dot technology is used in display products, then quantum dots are applied, but conversion efficiency of front brightness is low
Solution Approach 1:
The patent employs a dual-layer photoluminescent quantum dot structure where the first photoluminescent quantum dot layer and second photoluminescent quantum dot layer are positioned at different depths relative to the light-emitting element. This spatial arrangement in multiple dimensions enables sequential conversion of excitation light, with the first layer converting some excitation light and the second layer converting remaining excitation light, thereby significantly improving front brightness conversion efficiency while maintaining high brightness output
Solution Approach 2:
The patent creates a continuous light conversion process by arranging the first and second photoluminescent quantum dot layers in sequence along the light path. The excitation light undergoes continuous conversion: first by the first photoluminescent quantum dot layer, then by the second photoluminescent quantum dot layer. This continuous action ensures that excitation light is progressively converted throughout its path, maximizing conversion efficiency and maintaining high brightness
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
Improves light extraction rate, light emission luminance, and contrast by utilizing light emitted by the first light-emitting devices that is not absorbed by the first photoluminescent layers in the second photoluminescent layers, enhancing overall light utilization and display performance.
Implementation Method 1
a plurality of first light-emitting devices on a side of the first base substrate and corresponding to the sub-pixel areas one by one
Implementation Method 2
a plurality of first photoluminescent layers on the side of the first light-emitting devices away from the first base substrate
Implementation Method 3
a first pixel definition layer between the first photoluminescence layers and the second photoluminescence layers and including third opening areas corresponding to the second light-emitting devices one by one
Implementation Method 4
utilizing light emitted by the first light-emitting devices that is not absorbed by the first photoluminescent layers in the second photoluminescent layers
Data Source
AI summary
A display panel includes: a first base substrate including sub-pixel areas; first light-emitting devices corresponding to the sub-pixel areas one by one; a first dam layer including first opening areas; first photoluminescent layers on a side of the first light-emitting devices away from the first base substrate and in at least part of the first opening areas; second light-emitting devices on a side of the first dam layer away from the first light-emitting devices; a second dam layer on a side of the second light-emitting devices away from the first base substrate and including second opening areas corresponding to the sub-pixel areas one by one; and second photoluminescent layers on a side of the second light-emitting devices away from the first base substrate and in at least part of the second opening areas. Orthographic projections of the second light-emitting devices do not overlap with the sub-pixel areas.