Integrally-Formed Anti-Reflection Structure for OLED Display Panels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting diode (OLED) display panels face visibility issues due to ambient light reflection, particularly in outdoor use, which affects the display's visibility and contrast ratio.
Innovation Solution
The implementation of an integrally-formed anti-reflection structure on the OLED display panel, comprising a photo-sensitive alignment layer, a liquid crystal circular polarizer, and a linear polarizer, along with an optical absorbing layer to inhibit ambient light reflection without requiring additional adhesive layers, thereby enhancing visibility and contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an anti-reflection structure is added to reduce ambient light reflection, then visibility and contrast ratio are improved, but device complexity and manufacturing complexity increase
Solution Approach 1:
The patent combines multiple functional layers (photo-sensitive alignment layer, liquid crystal circular polarizer, and linear polarizer) into a single integrally-formed anti-reflection structure that is directly formed on the OLED display panel. This merging of multiple components into one integrated structure reduces the number of separate parts while achieving the anti-reflection function, thereby improving visibility without proportionally increasing device complexity
Solution Approach 2:
The photo-sensitive alignment layer serves as an intermediary that enables the formation of the liquid crystal circular polarizer through photopolymerization. This intermediary layer facilitates the integration of the anti-reflection structure directly onto the OLED panel, allowing the system to achieve reduced ambient light reflection while maintaining a streamlined manufacturing process
2Illumination intensity
If an anti-reflection structure with multiple layers is implemented, then contrast ratio is improved, but manufacturing precision requirements increase
Solution Approach 1:
By merging the photo-sensitive alignment layer, liquid crystal circular polarizer, and linear polarizer into a single integrally-formed structure, the patent eliminates the need for separate alignment and assembly steps that would require high precision. The integral formation process ensures proper alignment of all layers simultaneously, reducing manufacturing precision requirements while maintaining the multi-layer functionality needed for high contrast ratio
Solution Approach 2:
The photo-sensitive alignment layer performs multiple functions: it serves as the alignment layer for liquid crystal molecules, acts as a structural component of the anti-reflection structure, and enables photopolymerization for curing. This self-service capability of a single layer reduces the number of separate components that need precise alignment, thereby lowering manufacturing precision requirements while achieving the desired contrast ratio improvement
3Reliability
If a photo-sensitive alignment layer with low curing temperature is used, then the OLED device is protected from damage, but the curing process may be less effective
Solution Approach 1:
The patent selects a photo-sensitive alignment layer with specific chemical composition that enables curing at low temperatures (below the glass transition temperature of the OLED light-emitting layer). This parameter change in the curing temperature allows the manufacturing process to proceed without damaging the sensitive OLED device, while the selected photo-sensitive material maintains adequate curing effectiveness through its molecular structure and photoreactivity
Solution Approach 2:
The optical absorbing layer acts as an intermediary that absorbs excess or harmful light during the photopolymerization process, allowing the curing to proceed effectively even at lower temperatures. This intermediary layer ensures that the photo-sensitive alignment layer receives sufficient energy for proper curing while protecting the OLED device from thermal and optical damage
4Stability of the object's composition
If additional adhesive layers are added to attach the anti-reflection structure, then the structure is more stable, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the anti-reflection structure with the OLED display panel by directly forming the structure on the panel surface, eliminating the need for separate adhesive layers. The integrally-formed structure achieves stable attachment through the photopolymerization process that bonds the photo-sensitive alignment layer to the underlying surface, thereby maintaining structural stability while reducing manufacturing complexity and eliminating additional materials
Solution Approach 2:
The photo-sensitive alignment layer serves as both the functional anti-reflection component and the bonding layer that attaches the structure to the OLED panel. Through photopolymerization, this layer creates its own adhesion to the underlying surface, eliminating the need for separate adhesive materials and simplifying the manufacturing process while maintaining structural stability
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 panel thickness by integrating the anti-reflection structure directly onto the display panel without damaging the OLED device.
Implementation Method 1
an optical absorbing layer 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
Data Source
AI summary
A display panel includes a display device, a light-guiding structure and an anti-reflection structure. The light-guiding structure is disposed between the pixels to guide light beams emitted from the pixels toward a display surface. 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.