Top-Emitting OLED Substrate Ambient Light Absorption
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Solution Overview
Problem
Top-emitting OLED components face challenges in maintaining light-emitting efficiency while ensuring display contrast, as high reflectivity anodes reflect ambient light, degrading contrast and efficiency.
Innovation Solution
A display substrate with a filter film and electrode structures having specific light absorption and reflectivity properties, including a second transparent electrode film, phase difference layer, and light absorbing layer, to absorb ambient light without significantly reducing light-emitting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high reflectivity anode is used to improve light-emitting efficiency, then the light-emitting efficiency is improved, but the display contrast is degraded due to reflection of ambient light
Solution Approach 1:
A filter film is introduced as an intermediary component between the high reflectivity anode and the ambient light. This filter film selectively absorbs ambient light while allowing the emitted light from the OLED component to pass through, thereby resolving the contradiction by mediating the interaction between the anode and ambient light
Solution Approach 2:
The filter film is applied selectively to specific regions or layers of the OLED component structure. By localizing the light absorption property to the filter film layer, the solution maintains high light-emitting efficiency in the anode while locally addressing the ambient light reflection issue to preserve display contrast
2Object-affected harmful factors
If a filter film is added to absorb ambient light and improve display contrast, then the display contrast is improved, but the light-emitting efficiency is reduced because the filter film cannot absorb all wavelengths
Solution Approach 1:
The solution employs a composite structure combining the high reflectivity anode material with a filter film material having complementary optical properties. The anode provides high reflectivity for emitted light wavelengths while the filter film absorbs ambient light wavelengths, creating a composite system that achieves both high light-emitting efficiency and good display contrast
Solution Approach 2:
The filter film is designed with specific optical parameters (absorption spectrum, thickness, material composition) that are optimized to absorb ambient light wavelengths while being transparent to emitted light wavelengths. By carefully controlling these parameters, the solution achieves selective light absorption that improves display contrast without significantly reducing light-emitting efficiency
3Object-affected harmful factors
If a black cathode with higher light absorption rate is used to improve display contrast, then the display contrast is improved, but the light-emitting efficiency is degraded because the cathode absorbs emitted light
Solution Approach 1:
Instead of making the cathode highly absorptive to improve display contrast, the solution inverts the approach by using a transparent cathode that allows light to pass through. The display contrast improvement is then achieved by placing the filter film on the anode side, which absorbs ambient light without interfering with the emitted light path from the organic light-emitting layer through the transparent cathode
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 effectively absorbs ambient light, maintaining high light-emitting efficiency and display contrast by optimizing the light absorption and reflectivity of the electrode structures, allowing for flexible and efficient OLED display implementation.
Implementation Method 1
A thickness of the phase difference layer is an odd multiple of a half wavelength of visible light
Implementation Method 2
The light reflectivity of the light absorbing layer is lower than a second threshold, and the light absorption rate of the light absorbing layer to light emitted by the organic light-emitting layer is less than a third threshold
Implementation Method 3
A filter film arranged on the top-emitting OLED component can absorb part of the ambient light
Data Source
AI summary
The present disclosure provides a display substrate and a display device. The display substrate includes a first electrode structure, an organic light-emitting layer and a second electrode structure orderly arranged on a base substrate. The display substrate further includes a filter film located on a light-emitting side of the display substrate. A light absorption rate of a first electrode structure or a second electrode structure is greater than a first threshold.