Polarizer with Dual-Wavelength Absorbing Adhesive Layer for OLED Displays
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices face challenges in representing black color and maintaining high contrast ratios due to external light reflection, particularly in bright environments, as they lack effective solutions for absorbing a wide range of incident light wavelengths.
Innovation Solution
A polarizer comprising an adhesive layer with light-absorbing components, a phase retardation layer, and a linear polarizer is used, where the adhesive layer absorbs light in the blue and red spectral ranges, and the phase retardation layer retards light phases to reduce reflection, while the linear polarizer further enhances polarization, thereby minimizing external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional polarizer is used on OLED, then the device structure is simple, but external light reflection is not effectively prevented, resulting in poor black color representation and low contrast ratio in bright environments
Solution Approach 1:
The polarizer is divided into multiple functional layers: adhesive layer with first light absorbing component (for blue light absorption), reflective layer, and second light absorbing component (for red light absorption). This segmentation allows each layer to target specific wavelength ranges, effectively preventing external light reflection across the visible spectrum while maintaining manageable structural complexity
Solution Approach 2:
The polarizer uses composite material structure combining different light absorbing components with specific absorption characteristics. The first light absorbing component targets short wavelengths (blue light), while the second light absorbing component targets long wavelengths (red light), creating a composite system that comprehensively addresses external light reflection across different spectral ranges
2Object-affected harmful factors
If light absorbing components are added to the adhesive layer, then light absorption in blue and red spectral ranges is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The first light absorbing component is integrated directly into the adhesive layer during the adhesive layer formation process, rather than being applied as a separate subsequent step. This merging of functions allows the adhesive layer to simultaneously provide both adhesion and light absorption properties, simplifying the overall manufacturing process despite the added functionality
Solution Approach 2:
The invention specifies particular wavelength absorption ranges for the light absorbing components (first component for blue light, second component for red light), allowing manufacturers to select materials with appropriate absorption characteristics. This parameter-based approach provides guidance for material selection while maintaining manufacturing feasibility
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 polarizer effectively absorbs and reduces external light reflection across various wavelengths, improving the display's ability to represent black colors and maintain high contrast ratios, even in bright environments.
Implementation Method 1
a first light absorbing component configured to absorb a first light having a peak wavelength of about 430 nm or less
Implementation Method 2
a second light absorbing component configured to absorb a second light having a peak wavelength ranging from about 640 nm to about 720 nm
Implementation Method 3
a phase retardation layer on the adhesive layer
Implementation Method 4
a linear polarizer on the phase retardation layer
Data Source
AI summary
A polarizer includes: an adhesive layer including a binder resin and a light absorbing component dispersed in the binder resin, the light absorbing component including: a first light absorbing component to absorb a first light having a peak wavelength of about 430 nm or less; and a second light absorbing component to absorb a second light having a peak wavelength ranging from about 640 nm to about 720 nm; a phase retardation layer on the adhesive layer; and a linear polarizer on the phase retardation layer.