Reflective Layer Height Layout for Asymmetric Light-Emitting Displays
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Solution Overview
Problem
Current display devices face inefficiencies in light emission due to uniform reflective layer heights, which can lead to light loss through total reflection, especially in areas with varying widths.
Innovation Solution
A display device design featuring a reflective layer with varying heights based on the width of the light emitting area, where areas facing in the narrower direction have greater heights and those in the wider direction have smaller heights, to optimize light reflection and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a uniform reflective layer height is used across the entire light emitting area, then the manufacturing process is simple, but light loss occurs through total reflection in areas with varying widths
Solution Approach 1:
The reflective layer is designed with different heights in different regions: first areas facing each other in the first direction have greater heights, while second areas facing each other in the second direction have smaller heights. This local variation optimizes light reflection efficiency in each region, preventing total internal reflection losses that occur with uniform heights.
Solution Approach 2:
The reflective layer introduces asymmetric height variations to match the asymmetric width characteristics of the light emitting area. By making the reflective layer heights correspond to the narrow and wide directions of the light emitting area, the structure optimizes light extraction efficiency without requiring complete symmetry.
2Illumination intensity
If the reflective layer height is increased to improve light reflection, then light efficiency improves, but light loss through total reflection increases in wider areas
Solution Approach 1:
Different regions of the reflective layer have different heights optimized for their specific geometric conditions. First areas in the narrower direction have greater heights to maximize reflection, while second areas in the wider direction have smaller heights to avoid total internal reflection, thereby optimizing light output across the entire structure.
Solution Approach 2:
The height parameter of the reflective layer is varied spatially across different regions. By changing the height parameter from uniform to variable, the structure adapts to different width conditions in the light emitting area, optimizing light extraction efficiency and preventing energy loss through total reflection.
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 design enhances light efficiency by minimizing light loss through tailored reflective layer heights, improving light output in both narrow and wide light emitting areas.
Implementation Method 1
a reflective layer disposed on the light emitting element
Data Source
AI summary
A display device includes a light blocking layer surrounding a light emitting area; a light emitting element disposed in the light emitting area; and a reflective layer disposed on the light emitting element, and a width of the light emitting area in a first direction is less than a width of the light emitting area in a second direction, and heights of first areas of the reflective layer facing each other in the first direction are greater than heights of second areas of the reflective layer facing each other in the second direction.