OLED Phase Difference Layer with Dual Wavelength Dispersion Liquid Crystals
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) displays face challenges in minimizing outer light reflection, which affects image quality and efficiency, particularly due to the limitations of traditional linear polarizers and retarders in managing light wavelengths.
Innovation Solution
The implementation of a phase difference layer with specific liquid crystal patterns and a linear polarization layer in OLED displays, where the phase difference layer includes a combination of positive and inverse wavelength dispersion liquid crystals with controlled phase difference values, and an overcoat layer, to effectively manage and reduce outer light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional linear polarizer and λ/4 retarder are used to suppress outer light reflection, then reflection is reduced, but the device becomes thick and rigid
Solution Approach 1:
The patent changes the optical parameters of the liquid crystal layer by using dual wavelength dispersion characteristics (positive and inverse wavelength dispersion) to achieve λ/4 phase difference at multiple wavelengths simultaneously. This allows the system to maintain anti-reflection functionality across different wavelengths without requiring multiple separate retarder layers, thereby reducing overall thickness.
Solution Approach 2:
The patent employs a composite liquid crystal system combining positive wavelength dispersion liquid crystal and inverse wavelength dispersion liquid crystal in a single layer. This composite approach enables the layer to provide different phase difference characteristics for different wavelength ranges, achieving broad-spectrum anti-reflection performance in a single thin layer rather than requiring multiple stacked retarders.
2Object-affected harmful factors
If conventional retarders are used to manage light wavelengths, then reflection is suppressed, but the display loses flexibility
Solution Approach 1:
The patent replaces conventional rigid retarder films with a flexible liquid crystal layer that can be integrated into thin-film OLED structures. The liquid crystal material's molecular structure and phase properties enable it to maintain optical functionality while conforming to flexible substrates, allowing the display to be bent, rolled, or stretched without compromising performance.
Solution Approach 2:
The patent utilizes the tunable optical parameters of liquid crystal materials, which can be adjusted by changing molecular orientation and phase state. This allows the same thin-film structure to maintain λ/4 phase difference characteristics across different wavelengths and flexible configurations, enabling both anti-reflection performance and mechanical flexibility.
3Manufacturing precision
If multiple liquid crystal patterns with different phase difference values are used, then wavelength management is improved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the functions of multiple separate liquid crystal layers (each designed for specific wavelengths) into a single dual-wavelength-dispersion liquid crystal layer. This unified structure provides both positive and inverse wavelength dispersion characteristics simultaneously, achieving precise wavelength control across the visible spectrum without requiring multiple stacked layers or complex multi-layer configurations.
Solution Approach 2:
The patent creates a universal liquid crystal layer that performs multiple functions: it provides λ/4 phase difference for both red and green wavelengths, exhibits both positive and inverse wavelength dispersion characteristics, and maintains flexibility. This single multi-functional layer replaces what would traditionally require multiple specialized layers, simplifying the overall device structure while maintaining manufacturing precision.
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 reduces outer light reflection across various wavelengths, enhancing image quality and allowing for a slim, flexible OLED display that can be bent, rolled, or stretched without compromising performance.
Implementation Method 1
a phase difference layer, the phase difference layer including a first liquid crystal pattern on the first organic light emitting diode, and a second liquid crystal pattern on the second organic light emitting diode and the third organic light emitting diode
Implementation Method 2
the second liquid crystal pattern includes an inverse wavelength dispersion liquid crystal
Implementation Method 3
a linear polarization layer on the phase difference layer
Implementation Method 4
a first organic light emitting diode to emit light of a first wavelength, a second organic light emitting diode to emit light of a second wavelength, and a third organic light emitting diode to emit light of a third wavelength
Data Source
AI summary
An organic light emitting diode display includes: a display module including a first organic light emitting diode to emit light with a first wavelength, a second organic light emitting diode to emit light with a second wavelength, and a third organic light emitting diode to emit light with a third wavelength; a phase difference layer including a first liquid crystal pattern on the first organic light emitting diode, and a second liquid crystal pattern on the second organic light emitting diode and the third organic light emitting diode; and a linear polarization layer on the phase difference layer.