Touch Display Panel Refractive Stack for Quantum Dot Light Leakage
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Solution Overview
Problem
The limited absorption of blue backlight by quantum dot materials in quantum dots light emitting diodes (QLEDs) affects the light emitting efficiency and color gamut of display devices, limiting their development.
Innovation Solution
A touch display panel design incorporating a stacked insulation structure with refractive index layers to enhance light utilization and reflection, reducing light leakage and improving color purity without increasing thickness, and a touch module positioned away from light emitting devices to minimize parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dot materials are used to convert blue backlight to red and green light, then color gamut and light quality are improved, but light absorption efficiency is limited due to material properties
Solution Approach 1:
The patent divides the single-layer quantum dot structure into multiple layers with different quantum dot materials and sizes. Each layer is optimized to absorb specific wavelengths of blue light, creating a segmented absorption spectrum that covers the entire blue light range more efficiently than a single layer could achieve.
Solution Approach 2:
Different quantum dot layers are positioned at specific locations with different thicknesses and material compositions tailored to local light intensity and wavelength requirements. The first quantum dot layer uses materials with different bandgaps than the second layer, creating local quality variations that optimize absorption at each depth level.
2Loss of energy
If a stacked insulation structure with multiple refractive index layers is added to improve light utilization, then light reflection and utilization are enhanced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the insulation function with the optical function by integrating the stacked insulation structure directly beneath the quantum dot layers. This merged structure serves dual purposes: providing electrical insulation between layers while simultaneously managing light reflection and transmission, thereby reducing the need for separate optical components.
Solution Approach 2:
The stacked insulation structure with varying refractive indices is designed to perform multiple functions: electrical insulation, light reflection, light transmission, and potentially mechanical support. This multi-functional design reduces the overall device complexity by eliminating the need for separate dedicated components for each function.
3Device complexity
If the touch module is positioned closer to the light emitting devices for structural integration, then device integration is improved, but parasitic capacitance increases affecting touch accuracy
Solution Approach 1:
The stacked insulation structure with different refractive indices serves as an intermediary layer between the quantum dot layers and the touch module. This intermediary structure provides electrical isolation to minimize parasitic capacitance while maintaining structural integration and optical functionality, thereby preserving touch accuracy.
4Loss of energy
If quantum dot layers are made thicker to improve light absorption, then light conversion efficiency is improved, but panel thickness increases
Solution Approach 1:
Instead of using a single thick quantum dot layer, the patent segments the quantum dot structure into multiple thinner layers, each optimized for specific wavelength absorption. This segmentation allows achieving high overall conversion efficiency while keeping each individual layer thin, thus maintaining overall panel thinness.
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 light utilization and conversion rates, improves front light output efficiency, and maintains color purity while reducing panel thickness and enhancing touch accuracy.
Implementation Method 1
at least one layer of stacked insulation structure, which is located between the quantum dot layers and the first touch electrode layer, and is for transmitting light emitted by each quantum dot layer and reflecting light emitted by the light emitting devices
Implementation Method 2
at least one layer of stacked insulation structure, which is located between the quantum dot layers and the first touch electrode layer, and is for transmitting light emitted by each quantum dot layer and reflecting light emitted by the light emitting devices
Implementation Method 3
A quantum dots light emitting diode (QLED), as a new technology, has attracted people's attention and research in recent years because of a quantum confinement effect of a quantum dot material itself, whose successive energy band changing into discrete energy levels to emit high-purity light with a small peak width
Implementation Method 4
the QD material itself has limited absorption of blue backlight
Implementation Method 5
uses blue light to excite red light QD and green light QD to emit red light and green light
Data Source
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AI summary
Provided in the present disclosure are a touch-control display panel and a preparation method therefor, and a display apparatus. The touch-control display panel comprises: a first base substrate, which comprises sub-pixel regions; a plurality of light-emitting devices, which correspond to the sub-pixel regions on a one-to-one basis; a first pixel definition layer, which comprises first opening regions corresponding to the sub-pixel regions on a one-to-one basis; a plurality of quantum dot layers, which are located in at least some of the first opening regions; a touch-control module, which comprises a first touch-control electrode layer; and at least one stacked insulating structure, which is used for transmitting light that is emitted by the quantum dot layers and reflecting light that is emitted by the light-emitting devices, wherein the stacked insulating structure comprises a first refractive index layer and a second refractive index layer, the refractive index of the first refractive index layer is less than the refractive index of the second refractive index layer, the second refractive index layer is located between the first refractive index layer and the quantum dot layers, the first refractive index layer comprises a plurality of first refractive index patterns, the first refractive index patterns correspond to the quantum dot layers on a one-to-one basis, and orthographic projections of the first refractive index patterns on the first base substrate at least cover orthographic projections of the quantum dot layers on the first base substrate.