OLED Substrate Microcavity Structure for Ambient Light Reflection
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Solution Overview
Problem
OLED display equipment suffers from reduced light utilization due to the reflection of ambient light, which is not effectively addressed by conventional polarizers that absorb a significant amount of light, thereby impairing the reading experience, especially in outdoor conditions.
Innovation Solution
The OLED display substrate incorporates a microcavity structure between the anode and cathode with a hollowed-out portion and varying thicknesses or grating structures for the light-emitting layers and anodes, which reduces ambient light reflection and enhances light utilization without the need for a polarizer, while also ensuring privacy through angle-dependent luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is attached onto the surface of the OLED display equipment to eliminate the effect of ambient light, then the reading experience in strong light is improved, but the light utilization of the OLED display equipment is reduced due to absorption of about half of the light beams
Solution Approach 1:
The patent removes the polarizer component from the OLED display structure entirely. Instead of using a polarizer to filter ambient light, the invention employs a microcavity structure with specific optical properties that selectively manage light reflection and transmission, thereby eliminating the need for the polarizer and its associated light absorption loss.
Solution Approach 2:
The patent introduces a microcavity structure as an intermediary element between the OLED layers and the external environment. This microcavity acts as an optical mediator that controls the interaction between ambient light and the display, providing anti-reflection functionality without requiring a polarizer. The microcavity's optical resonance properties enable selective light management.
2Object-affected harmful factors
If a polarizer is used to reduce ambient light reflection, then the anti-glare performance is improved, but the device complexity increases due to the additional component
Solution Approach 1:
The patent merges the anti-reflection function with the existing OLED structure by integrating a microcavity design into the OLED layers themselves. The microcavity is formed as an inherent part of the OLED structure, combining the light-emitting function and the anti-glare function in a single integrated system, thereby eliminating the need for separate polarizer components.
Solution Approach 2:
The microcavity structure serves multiple functions simultaneously: it acts as the light-emitting cavity for the OLED, provides anti-reflection properties to reduce ambient light interference, and enables color emission through its optical resonance characteristics. This multi-functionality eliminates the need for dedicated anti-glare components like polarizers.
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
This solution increases the light-outgoing efficiency of the OLED display substrate, eliminating the need for a polarizer and ensuring that the displayed content is not visible from other angles, thereby enhancing both light utilization and privacy.
Implementation Method 1
a microcavity structure is formed between the anode and the cathode. The anode includes a hollowed-out portion, the light-emitting layers of the sub-pixel regions corresponding to different colors are of different thicknesses
Implementation Method 2
The anode is of a Bragg diffraction grating structure
Implementation Method 3
The anode is of a Bragg diffraction grating structure
Implementation Method 4
Each sub-pixel region includes a thin film transistor (TFT), an anode, a light-emitting layer and a cathode arranged successively
Data Source
AI summary
An OLED display substrate and a display device are provided. The OLED display substrate includes a plurality of sub-pixel regions corresponding to different colors arranged on a substrate. Each sub-pixel region includes a thin film transistor, an anode, a light-emitting layer and a cathode arranged successively in a direction away from the substrate, and a microcavity structure is formed between the anode and the cathode. The anode includes a hollowed-out portion, the light-emitting layers of the sub-pixel regions corresponding to different colors are of different thicknesses, or the anodes of the sub-pixel regions corresponding to different colors are of different thicknesses.