OLED Reflective Layer Layout for Glare and Luminous Efficacy
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Solution Overview
Problem
Existing organic EL display devices face issues with external light reflection, which deteriorate display quality by causing glare, coloration, and scattering, and current methods struggle to optimize both suppression of external light reflection and high luminous efficacy simultaneously.
Innovation Solution
A light-emitting device structure is implemented with a substrate having a display region and a peripheral region, where a high-reflection layer and a low-reflection layer are laminated in a specific sequence, and the low-reflection layer is partially removed in the display region to expose the high-reflection layer, while the peripheral region uses a low-reflection layer to suppress external light reflection, utilizing materials like Al, Ag, Co, Mo, Pt, Ta, Ti, TiN, and W for optimal reflectance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an aluminum alloy reflection film is provided over the entire region (display region and peripheral region) to optimize optical distance and improve luminous efficacy, then luminous efficacy is improved, but external light reflection increases causing display quality deterioration
Solution Approach 1:
The patent applies different reflection characteristics to different regions: the display region uses a high-reflection layer to enhance luminous efficacy, while the peripheral region uses a low-reflection layer to suppress external light reflection. This spatial differentiation of reflection properties resolves the contradiction between improving luminous efficacy and reducing external light reflection.
Solution Approach 2:
The reflection film is segmented into two distinct parts: a first reflection film in the display region with high reflectance, and a second reflection film in the peripheral region with low reflectance. This segmentation allows each region to have optimized reflection characteristics for its specific function, simultaneously achieving high luminous efficacy and reduced external light reflection.
2Use of energy by moving object
If a high-reflection layer is provided in the display region to enhance luminous efficacy, then luminous efficacy is improved, but external light reflection in the display region increases causing glare and coloration
Solution Approach 1:
The patent converts the harmful effect of external light reflection into a beneficial regional differentiation strategy. By intentionally creating a low-reflection peripheral region, the high reflection in the display region can be tolerated or even enhanced, as the peripheral region's low reflection compensates for the overall external light management, effectively converting the harmful reflection into a controlled optical design.
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 configuration effectively suppresses external light reflection and enhances luminous efficacy by optimizing the reflectance properties and optical interference, improving display quality and reducing glare and coloration issues.
Implementation Method 1
a first laminated section in which there are laminated, in the indicated sequence from the side of the substrate, a first high-reflection layer and a first low-reflection layer that has a lower reflectance than the first high-reflection layer
Data Source
AI summary
The light-emitting device has: a display region; a peripheral region; a first light-emitting element having a light-emitting region in which a lower electrode, a light-emitting layer, and an upper electrode are laminated; a first laminated section, between the substrate and the lower electrode of the first light-emitting element, in which there are laminated a first high-reflection layer and a first low-reflection layer that has a lower reflectance than the first high-reflection layer; a peripheral laminated section, in the peripheral region, in which there are laminated on the substrate; a peripheral lamination layer in which a peripheral high-reflection layer and a peripheral low-reflection layer that has a lower reflectance than the peripheral high-reflection layer are laminated. For at least a portion of the first laminated section that overlaps in plan view with the light-emitting region, the first low-reflection layer has an opening such that the first high-reflection layer is exposed.