Wavelength-Selective Polarizer for Display Brightness and Lifetime
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Solution Overview
Problem
Display apparatuses experience a decrease in brightness and reduced lifetime due to external light transmission, which affects the longevity and performance of the devices.
Innovation Solution
A display apparatus with a polarizer that includes a polarizing object configured to absorb ultraviolet light and visible light with wavelengths shorter than blue light, while transmitting visible light, and a supporting film on at least one surface of the polarizing object, effectively blocking external light and preventing damage to the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarizer is used to block external light, then the lifetime of the display apparatus is improved, but the brightness of the display apparatus decreases
Solution Approach 1:
The polarizer is designed with wavelength-selective properties, absorbing only ultraviolet and blue light components (380-480nm) while transmitting other visible wavelengths. This local quality approach allows the polarizer to block harmful short-wavelength light that causes aging and degradation, while maintaining brightness by transmitting the remaining visible spectrum, thus resolving the contradiction between lifetime improvement and brightness maintenance
Solution Approach 2:
The invention changes the optical parameters of the polarizer by specifying its absorption characteristics in particular wavelength ranges (380-480nm absorption, 480nm+ transmission). This parameter-based design enables selective blocking of harmful UV and blue light while preserving overall visibility and brightness, achieving both extended lifetime and maintained illumination intensity
2Reliability
If a polarizer absorbs ultraviolet and blue light, then the lifetime of the display apparatus is improved, but the amount of transmitted light decreases
Solution Approach 1:
The polarizer exhibits local quality by having different optical properties at different wavelengths: it strongly absorbs ultraviolet and blue light (380-480nm) to protect against degradation, while maintaining high transmission for green, yellow, orange, and red wavelengths. This wavelength-dependent local quality ensures that energy loss is minimized in the transmitted visible spectrum while effectively blocking harmful components
Solution Approach 2:
The polarizer converts the potentially harmful ultraviolet and blue light into a beneficial filtering function. By absorbing these high-energy wavelengths that cause molecular degradation and outgassing, the polarizer protects the display apparatus components, while the absorbed energy is dissipated harmlessly, transforming a harmful radiation source into a protective mechanism
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 suppresses brightness decrease and improves the lifetime of the display apparatus by blocking harmful external light, preventing outgassing and electrical resistance issues, thus maintaining performance and extending the device's operational life.
Implementation Method 1
a polarizing object configured to absorb ultraviolet light and visible light having wavelengths shorter than a blue light of the visible light emitted from the light emitting element
Implementation Method 2
configured to transmit the visible light emitted from the light emitting element
Data Source
AI summary
A display apparatus includes a substrate; a light emitting element on the substrate that is configured to emit visible light; and a polarizer including a polarizing object on the substrate and a supporting film on at least one surface of the polarizing object. The polarizing object is configured to absorb ultraviolet light and visible light having wavelengths shorter than a blue light of the visible light emitted from the light emitting element and is configured to transmit the visible light emitted from the light emitting element.