Flexible Display Panel Quantum Dot Isolation for Color Shift
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Solution Overview
Problem
Flexible display panels using White QD OLED technology face visual role deviation due to the thicker quantum dot film layer, leading to color shift issues and scattering of quantum luminescent materials, which affects display quality.
Innovation Solution
A flexible display panel design that includes a quantum dot photoconversion layer with isolation portions surrounding the quantum dot luminescent material, reducing interference between adjacent pixels and scattering of quantum dot beams, and a color film layer with a black matrix and filter films to concentrate and filter light effectively, thereby minimizing color shift and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thicker quantum dot film layer is used in White QD OLED technology, then the color gamut and viewing angle are improved, but visual role deviation and color shift occur due to increased light scattering
Solution Approach 1:
The patent introduces a light blocking layer that segments the continuous quantum dot film into isolated regions. This segmentation prevents light from adjacent pixels from scattering into the quantum dot film of other pixels, thereby reducing color shift while maintaining the benefits of a thicker quantum dot layer for improved color gamut.
Solution Approach 2:
The light blocking layer acts as an intermediary element between adjacent pixel structures. It mediates the optical interaction by absorbing or blocking stray light before it can reach the quantum dot film, thus preventing the harmful scattering effect while allowing the thicker film to maintain its photoluminescence efficiency.
2Power
If a thicker quantum dot film layer is used, then the photoluminescence efficiency is improved, but light scattering increases causing color shift
Solution Approach 1:
The patent extracts or removes the scattered light from the optical path by introducing a light blocking layer. This layer selectively removes the harmful scattered light components while allowing the useful photoluminescence from the thicker quantum dot film to reach the viewer, thus separating the beneficial effect from the harmful one.
Solution Approach 2:
The light blocking layer converts the potentially harmful scattered light into a beneficial effect by using it to define sharper pixel boundaries. The scattered light that would otherwise cause color shift is instead blocked in a controlled manner, effectively using the scattering phenomenon's presence to enhance pixel definition while preventing color contamination.
3Manufacturing precision
If the quantum dot luminescent material is surrounded by isolation portions, then the concentration of quantum dot beams is improved, but the device structure becomes more complex
Solution Approach 1:
The patent merges the light blocking layer with existing pixel defining structures or combines multiple functions into this single layer. By integrating the isolation function with the pixel definition function, the design achieves beam concentration without proportionally increasing overall device complexity, as the light blocking layer serves multiple purposes simultaneously.
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 isolation of quantum dot luminescent materials and the use of a color film layer improve the concentration of quantum dot beams, reducing color shift and enhancing the display effect, resulting in a more vivid and accurate color representation.
Implementation Method 1
the quantum dot luminescent material is a first material configured to emit white light after being excited by the blue light emitted by the electroluminescent device
Implementation Method 2
an electroluminescent device arranged on the thin film transistors and driven by the thin film transistors, including a pixel defining layer and an electroluminescent material defined by the pixel defining layer
Data Source
AI summary
A flexible display panel, a flexible display device and a method of forming the flexible display panel are provided. The flexible display panel includes: a substrate; thin film transistors arranged in an array on the substrate; an electroluminescent device arranged on the thin film transistors and driven by the thin film transistors, including a pixel defining layer and an electroluminescent material defined by the pixel defining layer;a thin film encapsulation layer on the electroluminescent device; a quantum dot photoconversion layer on the thin film encapsulation layer, including an isolation portion and a quantum dot luminescent material surrounded by the isolation portion, where an orthographic projection of the isolation portion onto the substrate covers an orthographic projection of the pixel defining layer onto the substrate; and a cover plate arranged on the quantum dot photoconversion layer.