OLED Display Panel with Quantum Dot Color Conversion and Integrated Encapsulation
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Solution Overview
Problem
Existing flexible full-color OLED display panels face challenges in achieving a cost-effective and flexible fabrication process for large-size products due to the use of expensive materials and the difficulty in applying a flexible process, resulting in low product yield and high costs, as well as the need for complex and thick circular polarizers that hinder flexibility.
Innovation Solution
The OLED display panel incorporates an organic light emitting layer that emits a third color, with independent light emitting units formed using transparent material layers doped with quantum dots, allowing for a wider color gamut and a thin film encapsulation layer that simplifies the fabrication process, eliminating the need for fine metal masks and enabling flexible production of large-size products by integrating the third light emitting unit and encapsulation layer as a single structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional evaporation method with fine metal masks is used for fabricating full-color OLED, then color accuracy is improved, but manufacturing complexity and cost increase significantly
Solution Approach 1:
The patent extracts the color filtering function from the traditional evaporation process and metal masks, separating it into a distinct color filter layer that can be applied independently. This allows the organic light emitting layer to be fabricated using simpler evaporation without requiring complex fine metal masks, thus reducing manufacturing complexity while maintaining color accuracy through the dedicated filter layer
Solution Approach 2:
The patent segments the OLED structure into distinct functional layers: an organic light emitting layer that emits broad spectrum light, and a separate color filter layer that selectively transmits specific wavelengths. This segmentation allows each layer to be optimized independently - the evaporation process for the organic layer and separate processing for the color filter - thereby reducing overall fabrication complexity
2Object-affected harmful factors
If traditional thick circular polarizers are used, then light reflection control is improved, but flexibility and thickness are worsened
Solution Approach 1:
The patent merges the light reflection control function with the existing color filter layer and encapsulation structure. By integrating anti-reflection features into the color filter layer that is already part of the display stack, the patent eliminates the need for separate thick circular polarizer components, thereby maintaining reflection control while improving flexibility and reducing overall thickness
Solution Approach 2:
The color filter layer is designed to serve multiple functions simultaneously: color selection, anti-reflection, and encapsulation support. This multi-functionality eliminates the need for dedicated thick polarizer layers, improving flexibility while maintaining the necessary optical control properties
3Manufacturing precision
If quantum dot doped layers are used, then color gamut is improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the material composition parameter of the color filter layer by doping it with quantum dots. This parameter change enables the layer to exhibit enhanced optical properties including wider color gamut and improved light absorption characteristics, while the doping process itself can be integrated into existing fabrication workflows
Solution Approach 2:
The patent uses composite materials by combining quantum dots with the color filter layer matrix. This composite structure provides both the color filtering functionality and the enhanced optical properties from quantum dots, achieving wider color gamut while the composite nature allows for processing similar to conventional polymer-based filters
4Reliability
If separate encapsulation layer is used, then protection is improved, but fabrication complexity and cost increase
Solution Approach 1:
The patent merges the encapsulation function with the color filter layer by making the color filter layer itself serve as the encapsulation layer. This integration provides the necessary protection for the organic light emitting layer while eliminating the need for a separate encapsulation layer, thereby reducing fabrication complexity and material costs while maintaining protection functionality
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
This approach reduces production costs, improves yield, and allows for a wider color gamut by using quantum dot-doped layers and a unified encapsulation structure, enhancing the flexibility and efficiency of OLED display panel manufacturing.
Implementation Method 1
an organic light emitting layer between the anode layer and the cathode layer, the organic light emitting layer being configured to emit light having a third color
Implementation Method 2
a first light emitting unit, a second light emitting unit and a third light emitting unit arranged on a light emitting side of the organic light emitting layer and independent from each other, and configured to emit, under the action of the light having the third color, light having a first color, light having a second color and light having the third color
Data Source
AI summary
An OLED display panel, a fabricating method, and a display apparatus are disclosed. The OLED display panel includes a base substrate; an anode layer, a cathode layer and an organic light emitting layer between the anode layer and the cathode layer arranged on the base substrate, the organic light emitting layer being configured to emit light having third color; and first light emitting unit, second light emitting unit and third light emitting unit arranged on a light emitting side of the organic light emitting layer and independent from each other, and configured to emit, under the action of the light having the third color, light having a first color, light having a second color and light having the third color, respectively, the light having the first color, the light having the second color and the light having the third color being configured to generate white light when being mixed.