Patterned Coatable Thin-Film Polarizer for Small Pixel Displays
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Solution Overview
Problem
Current polarizer technologies, particularly iodine-doped poly(vinyl alcohol) films, face challenges in achieving uniform polarization across non-uniform display structures, leading to reduced brightness and optical distortions, especially in small pixel sizes like those found in smartphone displays.
Innovation Solution
A patterned coatable linear polarizer is developed using aromatic polymers complexed with dyes or iodine, with a thickness of 2 micrometers or less, which defines light polarizing and non-polarizing areas through shear coating and selective doping processes, allowing for precise patterning suitable for small pixel sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform polarizing film is used across the entire display area, then polarization uniformity is maintained, but display brightness is reduced due to light absorption in non-polarizing areas
Solution Approach 1:
The polarizing film is segmented into distinct polarizing and non-polarizing regions, allowing different areas of the display to have different polarization characteristics. This segmentation enables the film to adapt to the non-uniform structure of modern displays with subpixels and openings, maintaining brightness while providing necessary polarization where required.
Solution Approach 2:
Different regions of the polarizing film are given different properties: areas over subpixels are made polarizing to control light, while areas over openings are made non-polarizing to maintain brightness. This local differentiation resolves the contradiction between uniform polarization and display brightness requirements.
2Reliability
If patterned polarizer is created using existing technologies, then polarization functionality is achieved, but manufacturing complexity and difficulty increase
Solution Approach 1:
The patterned polarizer structure is created during the film deposition process itself, before the film is applied to the display. By pre-forming the patterned structure in a controlled deposition environment, the manufacturing complexity is managed more effectively, and the film can be precisely patterned without requiring complex subsequent processing steps.
3Reliability
If polarizing film thickness is increased to improve polarization efficiency, then polarization performance improves, but optical distortions increase and display brightness decreases
Solution Approach 1:
The film thickness parameter is optimized to a thin range (50-80 micrometers) to maintain polarization efficiency while minimizing optical distortions. By carefully controlling the thickness parameter and using materials with high polarization efficiency, the system achieves good polarization performance without the harmful optical distortions that would result from thicker films.
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 provides enhanced transmittance and polarization efficiency, averaging 37% transmittance and 96% polarization over the visible spectral range, while avoiding optical distortions, making it suitable for modern display technologies like LCDs, OLEDs, and micro-LEDs.
Implementation Method 1
The coating layer defines light polarizing areas and light non-polarizing areas, where the light polarizing areas form a pattern
Implementation Method 2
A patterned linear polarizer layer is obtained by shear coating a polymeric lyotropic liquid crystal solution on a coatable substrate
Implementation Method 3
treating the resulting polymer layer with a doping-passivation solution containing the dopant and multi-valent cations
Data Source
AI summary
A patterned linear polarizer layer is obtained by shear coating a polymeric lyotropic liquid crystal solution on a coatable substrate, drying and treating the resulting polymer layer with a doping-passivation solution containing the dopant and multi-valent cations, where the patterned structure is obtained using various methods like restricting the doping process to certain areas of the polymer layer or discoloring the doping agent in certain areas of the linear polarizer or by selective removal of parts of the linear polarizer layer and others. The thickness of the dry linear polarizer coating layer is 2.0 micrometer or less.