Flexible OLED Buffer Layer Segmentation for Transmittance
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Solution Overview
Problem
Conventional flexible OLED panels face issues with stress mismatch between polyimide film layers, leading to tearing and poor transmittance, which affects the comprehensive performance of OLED devices.
Innovation Solution
A display panel preparation method involving the formation of a first buffer layer, followed by a barrier layer, and then a second buffer layer, with ultraviolet light mask processing to reduce adhesive forces between layers, allowing for separation and improving transmittance by using a transparent polyimide film layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If yellow polyimide film layer is used, then thermal properties and mechanical properties are improved, but transmittance decreases and yellow value increases
Solution Approach 1:
The buffer layer is divided into two separate layers: a first buffer layer (yellow polyimide) providing mechanical strength and thermal stability, and a second buffer layer (transparent polyimide) providing high transmittance. This segmentation allows each layer to fulfill its specific function without compromising the other, resolving the contradiction between mechanical properties and transmittance.
2Illumination intensity
If transparent polyimide film layer is used, then transmittance is improved, but thermal properties and mechanical properties deteriorate, causing stress mismatch
Solution Approach 1:
The buffer layer is divided into two separate layers: a first buffer layer (yellow polyimide) providing mechanical strength and thermal stability, and a second buffer layer (transparent polyimide) providing high transmittance. This segmentation allows each layer to fulfill its specific function without compromising the other, resolving the contradiction between mechanical properties and transmittance.
3Illumination intensity
If transparent polyimide film layer is used, then transmittance is improved, but stress mismatch occurs at high temperature leading to tearing
Solution Approach 1:
The buffer layer is divided into two separate layers: a first buffer layer (yellow polyimide) providing mechanical strength and thermal stability, and a second buffer layer (transparent polyimide) providing high transmittance. This segmentation allows each layer to fulfill its specific function without compromising the other, resolving the contradiction between mechanical properties and transmittance.
Solution Approach 2:
The invention uses a composite structure of two different polyimide materials with complementary properties. The first buffer layer uses yellow polyimide for thermal and mechanical stability, while the second buffer layer uses transparent polyimide for optical performance. This composite approach creates a synergistic effect where the combination of materials provides both high transmittance and reliable stress matching at high temperatures.
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 method enhances the light-transmitting performance and display effect of OLED panels by reducing adhesive forces and increasing the transmittance of the second buffer layer, addressing stress mismatch and optical defects.
Implementation Method 1
illuminating the barrier layer and the first buffer layer by using the mask, so that an adhesive force between the first buffer layer corresponding to the light-transmitting region and the barrier layer is reduced
Data Source
AI summary
A display panel and a display panel preparation method thereof are provided. A first buffer layer and a barrier layer are formed on a support base board, and then a second buffer layer is prepared on the barrier layer. In addition, the first buffer layer is illuminated by a mask process, so that an adhesive force between the first buffer layer and the barrier layer is reduced. The second buffer layer continues to be prepared, and the second buffer layer is a transparent film layer. Therefore, light transmitting performance and the display effect of the panel are effectively improved.