Curved Light Guide Member for OLED Display Efficiency
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Solution Overview
Problem
Organic light emitting display apparatuses face issues with low light extraction efficiency, leading to reduced brightness and increased power consumption, as well as problems with black color visibility, rainbow Mura, circular ring Mura, sparkle, and moire phenomena due to external light reflection and interference.
Innovation Solution
Incorporating a light guide member with a refractive layer and irregularly arranged light refraction patterns on a display panel, which includes a light extracting portion with curved surfaces to enhance light extraction and scatter external light, reducing the occurrence of unwanted optical effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light emitting display apparatus uses a conventional light extraction structure, then the device structure is simple, but the light extraction efficiency is low
Solution Approach 1:
The patent introduces a light guide member with a curved light extraction surface that replaces conventional flat extraction structures. The curved surface geometry redirects light paths to reduce total internal reflection, thereby increasing light extraction efficiency without adding complex multi-layer structures to the display panel itself.
Solution Approach 2:
The light guide member acts as an intermediary component positioned between the display panel and the external environment. It mediates light extraction by receiving light from the display panel's light extraction surface and redirecting it through its curved geometry, separating the extraction function from the display panel structure.
2Ease of manufacture
If a light emitting display apparatus uses a conventional flat light extraction surface, then the manufacturing is simple, but the black color visibility is poor due to external light reflection
Solution Approach 1:
The curved light extraction surface of the light guide member scatters incident external light in multiple directions rather than reflecting it directly back to the viewer. This curvature geometry effectively reduces the visibility of reflections from external light sources, improving black color perception without requiring complex anti-reflective coatings or multi-layer structures.
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
Improves light extraction efficiency, enhances black color visibility, minimizes rainbow and circular ring Mura, and reduces sparkle and moire phenomena, resulting in improved image quality and reduced power consumption.
Implementation Method 1
a light guide member on or below a light extraction surface of the display panel. The light guide member may include a plurality of lens patterns having an atypical arrangement structure, and a refractive layer on or below the plurality of lens patterns
Implementation Method 2
The light guide member may be configured to diffract or scatter light from the light emitting device layer or the light extracting portion
Implementation Method 3
Another aspect of the present disclosure is directed to providing an organic light emitting display apparatus including a light refraction pattern capable of improving a black color (or black rising) or a black visibility characteristic by a reflection of external light
Data Source
AI summary
An organic light emitting display apparatus may provide a display panel including a light extracting portion having a curved portion, and a light emitting device layer on the light extracting portion. The organic light emitting display apparatus may further provide a light guide member on or below a light extraction surface of the display panel. The light guide member may include a plurality of light refraction patterns having an atypical arrangement structure, and a refractive layer on or below the plurality of light refraction patterns.