Microlens Array Offset for AR Display Brightness Uniformity
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Solution Overview
Problem
Silicon-based OLEDs used in augmented reality systems face issues with color crosstalk and brightness uniformity when light is incident at a normal viewing angle, necessitating a customized angle for improved performance.
Innovation Solution
A display panel design featuring a substrate with a sub-pixel array and a microlens array where each microlens is offset from its corresponding sub-pixel by a set value, with aperture ratios gradually decreasing along a direction, allowing light to be deflected and improving brightness uniformity and color range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If silicon-based OLEDs are used in augmented reality systems with normal viewing angle, then the display can be viewed at a standard angle, but color crosstalk and brightness non-uniformity occur
Solution Approach 1:
The patent applies asymmetry by offsetting microlenses from the centers of sub-pixels in a systematic manner, creating an asymmetric microlens array configuration. This asymmetric arrangement causes light to be deflected at customized angles, transforming the symmetric normal viewing angle into an asymmetric customized angle that eliminates color crosstalk while maintaining brightness uniformity.
Solution Approach 2:
The patent changes the geometric parameters of the microlens array by introducing offset values and aperture ratio variations. By adjusting these parameters, the light emission characteristics are modified to achieve customized viewing angles, thereby resolving the color crosstalk and brightness non-uniformity issues at normal viewing angles.
2Object-generated harmful factors
If microlenses are offset from sub-pixels to achieve customized viewing angle, then color crosstalk is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent segments the microlens array into multiple independent microlenses, each with defined offset values relative to their corresponding sub-pixels. This segmentation allows for systematic control of light deflection angles, reducing color crosstalk while providing clear manufacturing guidelines for achieving the required precision through modular assembly.
Solution Approach 2:
The patent introduces an intermediary calculation layer that determines optimal offset values and aperture ratios based on desired viewing angles. This intermediary design phase allows for precise control of light paths before manufacturing, thereby reducing the actual manufacturing precision requirements by providing clear target specifications.
3Illumination intensity
If aperture ratios are varied across sub-pixels to improve brightness uniformity, then brightness uniformity reaches 90% or more, but device complexity increases
Solution Approach 1:
The patent applies local quality by assigning different aperture ratios to different sub-pixels based on their positions and light emission characteristics. This localized optimization ensures that each sub-pixel contributes appropriately to overall brightness uniformity, achieving 90% or more uniformity while maintaining a systematic and manageable complexity through position-based rules.
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 solution enhances light emitting efficiency and brightness uniformity, meeting the requirement of 90% or more brightness uniformity while enabling display at a customized angle, thereby improving the display effect and reducing color crosstalk in augmented reality applications.
Implementation Method 1
each microlens is offset, by n times of a set value, from a corresponding one of the sub-pixels in a first direction in which the sub-pixels are arranged... light emitted by the sub-pixels is deflected
Data Source
AI summary
Embodiments of the present disclosure provide a display panel, a manufacturing method thereof, and a display device. The display panel includes a substrate, and a plurality of pixel units on the substrate. The pixel units are arranged in an array, and two adjacent columns of pixel units are spaced apart from each other to form an interval area. Each pixel unit includes a pixel defining layer and sub-pixels, and the sub-pixels are in pixel areas defined by the pixel defining layer. Cathodes of all sub-pixels in one column of pixel units are connected as one single piece.