OLED Color Conversion Panel Light Blocking Layer
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Solution Overview
Problem
In organic light emitting diode (OLED) displays with color conversion panels using quantum dots, external light is reflected by quantum dots or scatterers, leading to reduced light extraction efficiency and deteriorated display quality.
Innovation Solution
The implementation of a color conversion panel with a substrate, a color filter layer, and light blocking layers having specific refractive indices and positions to prevent external light from being reflected by quantum dots or scatterers, enhancing light emission efficiency and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If quantum dots or scatterers are used in the color conversion panel to improve color reproducibility and luminance, then color quality is improved, but external light is reflected leading to reduced light extraction efficiency and deteriorated display quality
Solution Approach 1:
A light blocking layer with refractive index of 1.9-2.1 is introduced as an intermediary between the quantum dots/scatterers and the external environment. This layer mediates the interaction by blocking harmful external light while allowing emitted light to pass through, thus protecting the quantum dots from external light interference without compromising their luminance enhancement function
Solution Approach 2:
The refractive index parameter of the light blocking layer is specifically optimized to range from 1.9 to 2.1. This parameter change creates optimal optical conditions where the layer effectively blocks external light reflection while maintaining high light extraction efficiency for the emitted light, resolving the contradiction between luminance and reflection
2Measurement precision
If quantum dots are used to enhance color reproducibility, then color accuracy is improved, but light extraction efficiency drops due to reflection
Solution Approach 1:
The light blocking layer acts as a mediator that selectively interacts with different light paths. It blocks external incident light from reaching the quantum dots while allowing the light emitted by quantum dots to extract efficiently. This resolves the energy loss without compromising color reproduction accuracy
Solution Approach 2:
The light blocking layer is positioned specifically at the interface where external light enters the color conversion panel. This localized quality control addresses the reflection problem only where it occurs, without affecting the quantum dots' color conversion function in other regions
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 solution effectively minimizes external light reflection, thereby improving light emission efficiency and display quality by strategically positioning and designing the light blocking layers within the color conversion panel.
Implementation Method 1
a first light blocking layer disposed under the color filter layer... externally incident light is prevented from being reflected by quantum dots or other scatterers
Implementation Method 2
a color conversion panel that uses quantum dots... improve color reproducibility and luminance
Data Source
AI summary
An organic light emitting diode display includes: a display panel; and a color conversion panel positioned on the display panel. The color conversion panel includes: a substrate; a color filter layer disposed under the substrate; a first light blocking layer disposed under the color filter layer; and a first color conversion layer, a second color conversion layer, and a third color conversion layer positioned under the first light blocking layer. The color filter layer includes a first color filter, a second color filter, and a third color filter, the first light blocking layer includes a first portion that overlaps the first color filter, a second portion that overlaps the second color filter, and a third portion that overlaps the third color filter, and the first portion, the second portion, and the third portion are connected.