Light-Absorbing Polarizer for Sunlight-Induced Display Color Shift
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Solution Overview
Problem
Conventional polarizers in display devices fail to effectively mitigate the decrease in color temperature and color shift caused by exposure to sunlight, particularly ultraviolet and visible light, leading to degraded display performance.
Innovation Solution
Incorporating a light absorber in the functional layer of the polarizer to reduce the transmittance of light within a predetermined wavelength range (200 nm to 480 nm), specifically using materials like polyvinyl alcohol, triacetyl cellulose, and pressure-sensitive adhesives to enhance absorption and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polarizers are used in display devices, then the basic function of converting incident natural light into polarized light is achieved, but the color temperature decreases greatly and color shift occurs after irradiation of sunlight (ultraviolet and visible light)
Solution Approach 1:
The patent introduces a light absorber layer that converts the harmful ultraviolet and blue visible light into thermal energy through absorption. This transforms the harmful radiation that causes color temperature decrease and color shift into beneficial thermal energy, thereby protecting the luminescent material and maintaining display performance stability.
Solution Approach 2:
The light absorber layer acts as an intermediary between the sunlight (ultraviolet and visible light) and the luminescent material in the display panel. It absorbs the harmful wavelengths before they reach the luminescent material, preventing direct interaction and the resulting color temperature decrease and color shift, thus mediating the interaction to protect the display performance.
2Reliability
If a light absorber is added in the functional layer to reduce transmittance of light of predetermined wavelength, then color temperature stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the light absorber function with the existing functional layers of the polarizer. Instead of adding a completely separate component, the light absorber is integrated into the functional layer structure, combining multiple functions (polarization, light absorption, and functional support) into a unified component assembly, thereby reducing overall device complexity while maintaining color temperature stability.
Solution Approach 2:
The functional layer is designed to perform multiple functions simultaneously: it provides structural support, acts as an adhesive interface, and incorporates the light absorber function. This multi-functionality reduces the need for separate dedicated components, thereby reducing device complexity while achieving the goal of color temperature stability through light absorption.
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 reduces light transmittance to less than 15% in the specified wavelength range, improving display performance by preventing luminescent material degradation and alleviating color shift and dark-state light leakage, thereby enhancing viewing angles and overall display quality.
Implementation Method 1
a light absorber is added in the at least one functional layer to reduce transmittance of light of a predetermined wavelength
Data Source
AI summary
The present application provides a polarizer and a display device. The polarizer is fixed to one side of a display panel. The polarizer includes a polarizing layer and at least one functional layer stacked on the polarizing layer. The functional layer is added with a light absorber to reduce transmittance of light with a predetermined wavelength. This can effectively solve a problem that a color temperature of the display panel drops greatly after irradiation of the light of the predetermined wavelength. The present application also improves viewing angles and relieves color shift and dark-state light leakage.