Thin Film Encapsulation for OLED Contrast and Thickness
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face challenges in improving contrast and reducing thickness and production costs, primarily due to the use of thick circular polarizer films which increase thickness and production costs.
Innovation Solution
A thin film encapsulation unit is introduced, comprising an inorganic layer, alternating organic and inorganic layers, a light-blocking unit with organic materials, and a reflection-preventing layer with a metal and dielectric material, which improves contrast without the need for a circular polarizer film, allowing for a slimmer and more cost-effective OLED display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer film is used to improve contrast, then contrast is improved, but thickness and production cost increase
Solution Approach 1:
The circular polarizer film is divided into two separate functional layers: a linear polarizer layer and a phase difference film layer. This segmentation allows each layer to be optimized independently and enables the removal of the phase difference film while maintaining contrast improvement through the linear polarizer alone, thereby reducing overall thickness.
Solution Approach 2:
The phase difference film layer is extracted and removed from the circular polarizer structure. The patent demonstrates that the linear polarizer layer alone can provide sufficient contrast improvement without requiring the phase difference film, thus eliminating the thickness contribution of the removed layer.
2Object-affected harmful factors
If a circular polarizer film is used to improve contrast, then contrast is improved, but production cost increases
Solution Approach 1:
The phase difference film layer is extracted and removed from the circular polarizer structure. The patent demonstrates that the linear polarizer layer alone can provide sufficient contrast improvement without requiring the phase difference film, thus eliminating the thickness contribution of the removed layer.
Solution Approach 2:
The invention replaces the expensive circular polarizer film with a simpler linear polarizer layer structure that achieves comparable contrast performance. This substitution with a less complex, cheaper structure reduces production costs while maintaining the required optical performance.
3Object-affected harmful factors
If a circular polarizer film is used, then contrast is improved, but the display device cannot be slim
Solution Approach 1:
The circular polarizer film is divided into two separate functional layers: a linear polarizer layer and a phase difference film layer. This segmentation allows each layer to be optimized independently and enables the removal of the phase difference film while maintaining contrast improvement through the linear polarizer alone, thereby reducing overall thickness.
Solution Approach 2:
The invention replaces the expensive circular polarizer film with a simpler linear polarizer layer structure that achieves comparable contrast performance. This substitution with a less complex, cheaper structure reduces production costs while maintaining the required optical performance.
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 enhances contrast and reduces the thickness of OLED displays, improving flexibility and maintaining similar transmittance characteristics without the use of thick polarization plates, thus achieving a more efficient and cost-effective manufacturing process.
Implementation Method 1
a first organic layer on the inorganic layer and including a light-blocking unit and a light-transmitting unit
Implementation Method 2
a reflection-preventing layer on the first organic layer
Data Source
AI summary
A thin film encapsulation unit including an inorganic layer, a first organic layer on the inorganic layer and including a light-blocking unit and a light-transmitting unit, and a reflection-preventing layer on the first organic layer.