Reflective Polarizer Rth Compensation Layer Light Efficiency
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Solution Overview
Problem
Conventional liquid crystal displays with backlights suffer from low light efficiency and display luminance due to significant light absorption by polarizers, resulting in less than optimal image display.
Innovation Solution
The implementation of a reflective polarizer with a multilayer structure having different refractive indices and an Rth phase compensation layer, which is coupled with an absorptive polarizer to enhance light efficiency and display luminance by reducing light absorption and maintaining a wide viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional polarizer is used in a liquid crystal display, then the display can control polarization of incident light, but about 50% of light from the backlight is absorbed by the polarizer, resulting in low light efficiency and display luminance
Solution Approach 1:
The patent inverts the conventional approach by using a reflective polarizer that reflects the unwanted polarization component back through the liquid crystal layer rather than absorbing it. This allows the polarizer to maintain its polarization control function while returning approximately 50% of the light that would otherwise be absorbed back into the system, thereby improving light efficiency and display luminance
Solution Approach 2:
The patent introduces a reflective polarizer as an intermediary component between the backlight and the liquid crystal layer. This reflective polarizer acts as a mediator that separates the polarization components through reflection rather than absorption, allowing the unwanted component to be redirected back through the liquid crystal layer for potential reuse, thus improving overall light efficiency
2Loss of energy
If a reflective polarizer with multilayer structure is used, then light efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The reflective polarizer is segmented into multiple functional layers including a polarizing layer and a reflective layer. This segmentation allows each layer to perform its specific function - the polarizing layer controls polarization while the reflective layer reflects the unwanted component - and enables the complex functionality to be achieved through a structured combination of simpler components
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 configuration significantly improves light efficiency and display luminance while maintaining a wide viewing angle, effectively addressing the limitations of conventional liquid crystal displays.
Implementation Method 1
a first repetitively laminated structure 12-11 in which two layers having different refractive indices are repetitively formed
Implementation Method 2
a reflective polarizer 12 configured to increase light efficiency supplied from a backlight unit 500
Implementation Method 3
an Rth phase compensation layer 12-2 configured to compensate for a phase of an rth direction
Data Source
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AI summary
A polarizer includes a reflective polarizer main body and an Rth compensation layer. The reflective polarizer main body includes a repetitively laminated structure, the repetitively laminated structure including two layers of different refractive indices repetitively disposed on one another. The Rth phase compensation layer is disposed at one side of the reflective polarizer main body. The Rth phase compensation layer is configured to compensate for a phase difference in an Rth direction.