Anti-Reflection Structure for OLED Display Panels
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Solution Overview
Problem
Ambient light reflection significantly deteriorates the visibility of OLED display panels, especially in outdoor use, due to the lack of effective anti-reflection technologies that do not damage the display device or require additional adhesive layers.
Innovation Solution
An integrally-formed anti-reflection structure comprising a photo-sensitive alignment layer, a liquid crystal circular polarizer, and a linear polarizer, along with an optical absorbing layer, is directly formed on the OLED display panel to inhibit ambient light reflection without additional adhesive layers, enhancing visibility and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional anti-reflection technologies are applied to OLED display panels, then ambient light reflection is reduced, but the display device is damaged or additional adhesive layers are required
Solution Approach 1:
The anti-reflection structure is divided into multiple functional layers: a photo-sensitive alignment layer (first layer), a liquid crystal circular polarizer (second layer), and a linear polarizer (third layer). Each layer performs a specific function in reducing ambient light reflection without requiring adhesive layers, thus preventing damage to the OLED display panel while achieving the anti-reflection effect.
2Object-affected harmful factors
If additional adhesive layers are used to attach anti-reflection components, then anti-reflection performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The photo-sensitive alignment layer, liquid crystal circular polarizer, and linear polarizer are integrated into a single anti-reflection structure that is directly formed on the OLED display panel without requiring separate adhesive layers. This merging of functions reduces the total number of layers and simplifies the manufacturing process while maintaining effective anti-reflection performance.
3Manufacturing precision
If high curing temperature is used for photo-sensitive alignment layer, then alignment performance is improved, but organic light-emitting layer is damaged
Solution Approach 1:
The patent utilizes a photo-sensitive alignment layer with a low curing temperature (below the glass transition temperature of the organic light-emitting layer). By changing the parameter of curing temperature to a lower value, the alignment layer can be properly cured without damaging the temperature-sensitive organic light-emitting layer, thus achieving both good alignment performance and protection of the OLED structure.
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 reduces ambient light reflection, improving visibility and contrast ratio in outdoor conditions while minimizing manufacturing costs and maintaining the integrity of the OLED device, and allowing for flexible display configurations.
Implementation Method 1
The optical absorbing layer is over the OLED device and configured to absorb a light within a wavelength range
Implementation Method 2
The photo-sensitive alignment layer is sensitive to and curable by the light within the wavelength range
Implementation Method 3
The liquid crystal circular polarizer includes a plurality of liquid crystal molecules aligned by the photo-sensitive alignment layer
Implementation Method 4
the anti-reflection structure includes a photo-sensitive alignment layer, a liquid crystal circular polarizer and a linear polarizer
Implementation Method 5
The liquid crystal circular polarizer includes a plurality of liquid crystal molecules aligned by the photo-sensitive alignment layer
Data Source
AI summary
A display panel includes a display device, an optical absorbing layer, an anti-reflection structure and a cover layer. The display device includes a plurality of pixels. The optical absorbing layer is over the display device and configured to absorb a light within a wavelength range. The anti-reflection structure is over the pixels of the display device, wherein the anti-reflection structure includes a photo-sensitive alignment layer, a liquid crystal circular polarizer and a linear polarizer. The photo-sensitive alignment layer is over the optical absorbing layer, wherein the photo-sensitive alignment layer is sensitive to and curable by the light within the wavelength range. The liquid crystal circular polarizer is over the photo-sensitive alignment layer, wherein the liquid crystal circular polarizer includes a plurality of liquid crystal molecules aligned by the photo-sensitive alignment layer. The linear polarizer is over the liquid crystal circular polarizer. The cover layer is over the anti-reflection structure.