Touch Display Panel Refractive Stack for QD-OLED Light Utilization
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Solution Overview
Problem
The limited absorption of blue backlight by quantum dots in QD-OLED devices affects the light emitting efficiency and color gamut of display devices, limiting their development.
Innovation Solution
A touch display panel design incorporating quantum dot layers with a stacked insulation structure comprising refractive index layers of varying indices to enhance light utilization and reflectivity, reducing light leakage and improving color purity without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dot layers are used in QD-OLED devices, then color gamut and light purity are improved, but light absorption efficiency is limited due to the quantum dot material properties
Solution Approach 1:
The patent introduces a stacked insulation structure with different refractive index layers as an intermediary between the quantum dot layer and other components. This structure mediates light transmission and absorption by optimizing optical paths and reducing reflection losses, thereby improving light absorption efficiency without compromising color purity
Solution Approach 2:
The patent modifies optical parameters by using layers with different refractive indices to change light propagation characteristics. This parameter change optimizes light coupling into the quantum dot layer, enhancing absorption efficiency while maintaining the inherent color purity benefits of quantum dots
2Use of energy by moving object
If a stacked insulation structure with multiple refractive index layers is added, then light utilization and reflectivity are enhanced, but device structure complexity increases
Solution Approach 1:
The stacked insulation structure serves multiple functions simultaneously: it acts as an electrical insulation layer, an optical management layer for enhancing light utilization, and a reflective structure for improving light extraction. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity
Solution Approach 2:
The patent merges the insulation function with optical management functions by integrating the stacked refractive index layers into the existing device architecture. This combining approach allows the structure to perform both electrical isolation and optical optimization without requiring entirely separate systems
3Use of energy by moving object
If the stacked insulation structure is designed to reflect light from light emitting devices, then front light output efficiency is improved, but light leakage reduction may affect viewing angle
Solution Approach 1:
The stacked insulation structure is designed with spatially varying properties where different layers optimize for different angular ranges. The structure provides enhanced light extraction and reflection for front viewing angles while maintaining adequate performance for oblique angles, achieving local optimization that balances efficiency and viewing angle requirements
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 parasitic capacitances, thus enhancing touch accuracy.
Implementation Method 1
the stacked insulation structure includes a first refractive index layer and a second refractive index layer arranged on the whole layer: a refractive index of the first refractive index layer is smaller than a refractive index of the second refractive index layer
Implementation Method 2
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
Data Source
AI summary
A touch display panel and a preparation method, and a display apparatus. The touch display panel includes: a first base substrate, including sub-pixel regions; a group of light emitting devices, corresponding to the sub-pixel regions one to one; a first pixel defining layer, including first opening regions corresponding to the sub-pixel regions one to one; a group of quantum dot layers, in at least part of the first opening regions; a touch module, including a first touch electrode layer; and one layer of stacked insulation structure, configured to transmit light emitted by each quantum dot layer and reflect light emitted by the light emitting devices.