OLED Display Light-Absorption Layer for Reflection Reduction
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Solution Overview
Problem
Organic light-emitting diode (OLED) display devices face issues with light reflection from the outer surface, which interferes with the displayed image and requires the use of polarizers or anti-reflection coatings that reduce brightness by absorbing light, leading to a shortened service lifetime due to increased current flow.
Innovation Solution
A light-absorption layer is disposed on the outer surface of the OLED display device with openings that expose sub-pixel areas, positioned opposite to the active array structure, to absorb environmental light and reduce reflective areas, while maintaining light transmission from the organic light-emitting diodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer or anti-reflection film is attached to the outer surface to reduce light reflection, then image quality is improved, but brightness is reduced due to light absorption
Solution Approach 1:
The outer surface is segmented into different regions: a light-absorption layer is formed in non-display areas to reduce reflection, while display areas remain transparent to maintain brightness. This spatial segmentation allows simultaneous achievement of both goals.
Solution Approach 2:
Different regions of the outer surface are given different optical properties: non-display areas have light-absorbing characteristics to reduce reflection, while display areas maintain transparency to preserve brightness. This local differentiation resolves the contradiction between reflection reduction and brightness maintenance.
2Illumination intensity
If current flow is increased to compensate for brightness loss from anti-reflection films, then brightness is maintained, but service lifetime is shortened
Solution Approach 1:
The light-absorption layer is segmented to cover only non-display areas, allowing display areas to transmit light without absorption. This eliminates the need to increase current flow to compensate for brightness loss, thereby preserving service lifetime while maintaining brightness.
3Illumination intensity
If the outer surface is made smooth and flat for OLED display, then viewing angle and contrast ratio are improved, but light reflection from environment increases
Solution Approach 1:
The outer surface is segmented into display areas (smooth and flat for optimal viewing) and non-display areas (covered with light-absorption layer to reduce reflection). This segmentation allows the display areas to maintain their optical performance while non-display areas compensate for overall reflection.
Solution Approach 2:
Different regions have different surface properties: display areas maintain smoothness for optimal viewing angle and contrast, while non-display areas have light-absorbing properties to reduce environmental reflection. This local quality differentiation resolves the contradiction.
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 effectively reduces light reflection, maintains brightness, and extends the service lifetime of OLEDs by minimizing the need for increased current flow, thereby improving image quality and device longevity.
Implementation Method 1
a light-absorption layer is disposed on the outer surface of the organic light-emitting diode display device to absorb light projected from environment to the outer surface
Implementation Method 2
Organic light-emitting diodes (OLEDs) are light-emitting devices driven by electrical current
Data Source
AI summary
An organic light-emitting diode display device includes a substrate, a light-absorption layer, an active array structure, and an organic light-emitting diode. The substrate has a first and a second surface opposite to each other. The light-absorption layer is disposed on the first surface, and has at least one opening exposing a portion of the first surface. The active array structure is positioned on the second surface, and includes at least one data line, at least one gate line, and at least one switching device electrically connected to the gate and data lines. The light-absorption layer overlaps at least one of the data line and the gate line when viewed in a direction perpendicular to the substrate. The organic light-emitting diode is electrically connected to the switching device, and the organic light-emitting diode overlaps the opening when viewed in the direction perpendicular to the substrate.