Microlens Array Display Layout for Lower-Power Near-Eye Luminance
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Solution Overview
Problem
Existing display devices suffer from inefficient light emission due to suboptimal opening sizes and refractive index mismatches in microlens arrays, leading to increased power consumption and energy waste.
Innovation Solution
A display device design incorporating a microlens array with a light-transmitting layer, where the microlens units have a higher refractive index than the light-transmitting layer, and pixel openings are sized between 0.8 μm and 1.35 μm, optimizing the overlap with microlens units to enhance light directionality and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the opening size of light-emitting elements is increased to improve display luminance, then the light-emitting area increases, but the power consumption increases due to larger drive current requirements
Solution Approach 1:
The patent optimizes the pixel opening size to a specific range (0.8-1.35 μm) and adjusts the refractive index difference (n=0.2-0.35) between microlens units and light-transmitting layers to achieve optimal light extraction efficiency, thereby improving luminance while controlling power consumption through precise parameter control
Solution Approach 2:
The microlens array acts as an intermediary optical element that redirects light from the light-emitting elements, improving light utilization efficiency and enabling better luminance output without proportionally increasing the drive current requirements
2Use of energy by moving object
If the opening size of light-emitting elements is decreased to reduce power consumption, then the drive current decreases, but the display luminance decreases due to reduced light-emitting area
Solution Approach 1:
By precisely controlling the pixel opening size within 0.8-1.35 μm and optimizing the refractive index difference to 0.2-0.35, the patent achieves maximum light extraction efficiency that maintains high luminance output even with smaller opening sizes, thereby reducing power consumption without sacrificing display brightness
Solution Approach 2:
The patent employs a composite light adjustment layer combining microlens units with specific refractive index properties and light-transmitting layers, creating an optimized optical system that maximizes light output efficiency for given power consumption levels
3Productivity
If the refractive index difference between microlens units and light-transmitting layer is increased to improve light directionality, then the light extraction efficiency improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies an optimal refractive index difference range (n=0.2-0.35) that balances light extraction efficiency with manufacturability, avoiding excessively high refractive index differences that would be difficult to control during manufacturing while still achieving improved light directionality and extraction
4Use of energy by moving object
If the pixel opening size is optimized to reduce power consumption, then the drive current decreases, but the light-emitting area decreases leading to potential luminance loss
Solution Approach 1:
The patent determines an optimal pixel opening size range (0.8-1.35 μm) that represents the best compromise between light-emitting area and power consumption, where the light extraction efficiency enhancement from the microlens array compensates for the reduced opening size, maintaining luminance while reducing power requirements
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 ensures optimal display luminance while significantly reducing power consumption by rationalizing the pixel opening size and refractive index differences, thereby enhancing energy efficiency.
Implementation Method 1
a refractive index of the at least one microlens unit is greater than a refractive index of the light-transmitting layer
Data Source
AI summary
Provided are a design method of a display device, a display device and a near-eye display apparatus. The display device includes a substrate, light-emitting elements and a light adjustment layer. The light-emitting elements are located on one side of the substrate and facing a light-emitting surface of the display device, and a pixel opening is configured in each light-emitting element. The light adjustment layer is located on one side of the light-emitting elements away from the substrate. The light adjustment layer includes at least one microlens array and a light-transmitting layer located on one side of the microlens array away from the substrate and covering the microlens array, the microlens array includes at least one microlens unit, and a refractive index of the at least one microlens unit is greater than a refractive index of the light-transmitting layer.