OLED Display Substrate Light Processing Layer UV Protection
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Solution Overview
Problem
The lifetime of OLED devices is affected by exposure to light, particularly ultraviolet light, which impacts their long-term application in outdoor or strong light environments.
Innovation Solution
A display substrate is designed with a base substrate, a pixel layer, and a light processing layer comprising a condensed-ring conjugated polymer that allows specific light to pass through while preventing other light, including an ultraviolet absorption layer to protect OLED devices from ultraviolet damage and a visible light absorption layer to absorb unwanted colors, optionally including a photoelectric conversion unit to convert absorbed light into electrical energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED devices are used in outdoor or strong light environments, then the display performance is maintained, but the lifetime of the device is reduced due to ultraviolet light exposure
Solution Approach 1:
A light processing layer comprising condensed-ring conjugated polymer is introduced as an intermediary between the OLED device and external light environment. This layer selectively filters ultraviolet and unwanted visible light wavelengths while allowing emitted display light to pass through, thereby protecting the OLED from harmful radiation without compromising display performance in outdoor conditions
Solution Approach 2:
The patent converts the harmful effect of light absorption by introducing a photoelectric conversion unit that captures the absorbed light energy and transforms it into electrical energy. This not only protects the OLED from harmful light but also generates additional electrical power to extend device operation time, turning a potentially harmful exposure into a beneficial energy source
2Reliability
If a light processing layer is added to protect OLED from ultraviolet light, then device lifetime is extended, but device structure becomes more complex
Solution Approach 1:
The light processing layer is designed to perform multiple functions simultaneously: it acts as a UV filter to protect OLED, a visible light absorber to prevent unwanted color interference, and a photoelectric converter to generate electrical energy. By consolidating these functions into a single integrated layer, the patent avoids adding multiple separate components, thereby extending device lifetime without proportionally increasing structural complexity
Solution Approach 2:
The patent employs condensed-ring conjugated polymer as a composite material that combines multiple functional properties within a single material system. This polymer can simultaneously absorb UV light, filter visible light wavelengths, and convert absorbed light into electrical energy, replacing what would traditionally require multiple separate layers or components
3Reliability
If light processing layer absorbs unwanted light, then OLED protection is improved, but light emission efficiency may be reduced
Solution Approach 1:
The light processing layer is designed with local quality differentiation where different regions or aspects of the layer have specialized functions: one portion optimally transmits the specific wavelengths emitted by OLED sub-pixels to maintain emission efficiency, while another portion absorbs unwanted UV and visible light wavelengths to provide comprehensive protection. This selective wavelength handling ensures protection without compromising the efficiency of desired light emission
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 significantly enhances the resistance of OLED devices to strong light, reducing the adverse effects on their service life and extending their operational duration even in outdoor or high-light conditions.
Implementation Method 1
the light processing layer includes an ultraviolet absorption layer... The ultraviolet absorption layer may be used to prevent ultraviolet light
Implementation Method 2
the first visible light absorption layer as a whole layer, wherein the polymer containing nonfullerene at the positions corresponding to sub-pixels of different colors has visible light absorption groups which could absorb light having colors other than that of the sub-pixels
Implementation Method 3
the light processing layer also includes a light reflecting layer... The light reflection layer may be used to reflect light having colors other than that of the sub-pixels
Implementation Method 4
the display substrate also includes a photoelectric conversion unit connected to both the control circuit layer and the light processing layer for converting the light absorbed by the light processing layer into electrical energy
Data Source
AI summary
The disclosure provides a display substrate, a method for manufacturing the same and a display device, belonging to the display technology field, to solve the problem that ultraviolet irradiation has an adverse effect on the service life of existing OLED devices. The display substrate disclosed herein includes a light processing layer which comprising a condensed-ring conjugated polymer. The light processing layer can protect the display parts below it and prevent the display parts from being exposed to ambient light and reducing their service life.