Lower Polarizer Wavelength Conversion for LCD Light Efficiency
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Solution Overview
Problem
Liquid crystal display devices suffer from reduced light efficiency due to significant light loss as it passes through multiple layers, including the light guide plate, optical sheet, polarizers, and liquid crystal layer, leading to deteriorated image quality.
Innovation Solution
Incorporating a lower polarizer with a polarizing layer and a wavelength conversion material between the polarizing layer and the backlight unit to convert light wavelengths, ensuring uniform light intensity across the spectrum and enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light passes through multiple layers (light guide plate, optical sheet, polarizers, liquid crystal layer), then the liquid crystal display device can function properly, but light efficiency deteriorates due to significant light loss
Solution Approach 1:
The patent applies parameter changes by introducing a wavelength conversion material that converts blue light to green and red wavelengths. This changes the spectral parameters of the light passing through the device, allowing the light to match the transmission characteristics of the color filter layers and other optical components, thereby reducing overall light loss without removing any necessary layers
Solution Approach 2:
The patent uses a composite material approach by incorporating wavelength conversion material into the lower polarizer structure. This creates a composite optical component that combines the polarizing function with the wavelength conversion function, allowing simultaneous optimization of multiple optical parameters while maintaining the necessary layered structure
2Illumination intensity
If conventional polarizers are used without wavelength conversion, then the device structure remains simple, but light efficiency and image quality deteriorate
Solution Approach 1:
The patent merges the wavelength conversion function with the lower polarizer by incorporating wavelength conversion material into it. This combining of functions reduces the total number of separate components needed, as the lower polarizer simultaneously performs polarization and wavelength conversion, thereby improving light efficiency without significantly increasing manufacturing complexity
Solution Approach 2:
The wavelength conversion material acts as an intermediary between the blue light source and the color filter layers. It converts the blue light to green and red wavelengths that better match the transmission characteristics of subsequent optical layers, serving as a mediating element that optimizes light transmission through the entire device
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 use of a wavelength conversion material in the lower polarizer improves light efficiency by converting blue light to green and red wavelengths, minimizing light loss through color filter layers and resulting in a more uniform and intense image display.
Implementation Method 1
a wavelength conversion material provided between the polarizing layer and the backlight unit
Data Source
AI summary
A method of manufacturing a polarizer, includes forming a polarizing layer having a light axis for polarized light, forming an upper coating layer on an upper surface of the polarizing layer, forming an adhesive layer on an upper surface of the upper coating layer, forming a lower coating layer on a lower surface of the polarizing layer, and forming a protection layer on a lower surface of the lower coating layer, wherein the lower coating layer includes a wavelength conversion material configured to convert a wavelength of a received light to a different wavelength.