Photochromic OLED Encapsulation for Reflection Control
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Solution Overview
Problem
Organic light emitting diode (OLED) displays suffer from reduced visibility due to external light reflection, which is exacerbated by the use of metal layers with high light reflectivity, and existing solutions like linear polarization films and λ/4 phase delay films lead to significant light loss, decreasing efficiency.
Innovation Solution
Incorporating a photochromic material into the encapsulation member, such as a glass substrate, which changes color under external light, reducing reflection and maintaining high efficiency by absorbing external light without blocking emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a linear polarization film and λ/4 phase delay film are disposed to suppress external light reflection, then visibility is improved, but light loss increases and efficiency decreases
Solution Approach 1:
The patent applies a photochromic layer that changes its optical properties (absorption characteristics) in response to external light exposure. The photochromic material undergoes a reversible color change when exposed to UV or visible light, dynamically adjusting the encapsulation member's light absorption to suppress external light reflection while allowing emitted light to pass through, thereby resolving the contradiction between visibility improvement and light loss reduction
Solution Approach 2:
The patent changes the optical parameters of the encapsulation member by incorporating a photochromic layer that alters its absorption coefficient based on external light conditions. This dynamic parameter change allows the system to adaptively suppress external light reflection during daytime while maintaining high light transmission efficiency during nighttime or low-light conditions, eliminating the need for fixed polarization films that cause continuous light loss
2Power
If metal layers with high light reflectivity are used in OLED structure, then device performance is improved, but external light reflection increases and visibility deteriorates
Solution Approach 1:
The patent introduces a photochromic layer as an intermediary between the external environment and the OLED's metal layers. This intermediary layer dynamically adjusts its light absorption properties in response to external light, acting as a buffer that prevents external light from reaching and reflecting off the high-reflectivity metal layers, thereby preserving both device performance and visibility
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 photochromic material effectively minimizes external light reflection, enhancing visibility while maintaining high luminance and reducing power consumption, with less light loss compared to traditional polarization-based solutions.
Implementation Method 1
the encapsulation member includes a photochromic material so that the encapsulation member is colored by external light
Data Source
AI summary
An organic light emitting diode (OLED) display includes a substrate where OLEDs are formed and an encapsulation member fixed onto the substrate while covering the OLEDs. The encapsulation member includes a photochromic material so that the encapsulation member is colored by external light.