Mirror Display Reflective Layer Layout for Light Extraction
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Solution Overview
Problem
The existing mirror display technology reduces the brightness of light emitted from microscopic windows due to transmission through a lens array, affecting light extraction efficiency.
Innovation Solution
A display device with a substrate, a light-emitting element, a first reflective layer, and a light-exiting portion that includes a first opening and a second reflective layer to reflect light from the light-emitting portion to the opening, enhancing light extraction efficiency while functioning as a mirror.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is transmitted through the lens array portion to reach the microscopic windows, then the display function is achieved, but the brightness of emitted light is reduced
Solution Approach 1:
Instead of transmitting light through the lens array to the reflective layer, the invention inverts the approach by placing light-emitting elements directly on the substrate and using reflective layers to guide light outward through openings. This eliminates the energy loss associated with transmission through the lens array while maintaining the mirror display function.
Solution Approach 2:
The invention extracts the light-emitting function from the traditional mirror display structure by placing light-emitting elements directly on the substrate. This separates the light generation function from the light transmission path, allowing light to be emitted directly and reflected outward without passing through the lens array, thereby improving brightness and extraction efficiency.
2Adaptability or versatility
If the reflective layer is made with a mirror surface for mirror functionality, then mirror function is achieved, but light extraction from light-emitting elements is reduced
Solution Approach 1:
The reflective layer is segmented into multiple regions: a mirror surface portion for maintaining mirror functionality and opening portions for light extraction. This segmentation allows different areas of the reflective layer to serve different functions - the mirror surface reflects external light for mirror function, while the openings allow light from the light-emitting elements to escape efficiently.
Solution Approach 2:
Different portions of the reflective layer have different optical properties. The mirror surface portion has high reflectivity for external light to maintain mirror function, while the opening portions have high transmissivity to allow light from the light-emitting elements to escape. This local differentiation of optical properties resolves the contradiction between mirror function and light extraction efficiency.
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 display device improves light extraction efficiency and maintains mirror functionality by reflecting light from the light-emitting element effectively.
Implementation Method 1
a first reflective layer overlapping with the light-emitting portion and configured to reflect external light
Implementation Method 2
a second reflective layer configured to reflect light from the light-emitting portion to the first opening
Data Source
AI summary
A display device includes a substrate, and a light-emitting element provided on the substrate and including a light-emitting portion, a first reflective layer overlapping with the light-emitting portion and reflecting external light, and a light-exiting portion adjacent to the light-emitting portion. The light-emitting portion includes a first electrode, a first light-emitting layer, and a second electrode that are provided in this order from the substrate side to the first reflective layer side, and the light-exiting portion includes a first opening that is an opening of the first reflective layer and a second reflective layer reflecting light from the light-emitting portion to the first opening.