Micro-LED Catadioptric Display Screen for Ambient Light Contrast
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Solution Overview
Problem
Existing display technologies face challenges in achieving high contrast and efficiency in brightly illuminated environments due to ambient light reflections, which degrade image contrast and increase power consumption, especially with traditional LED displays that use black resin materials to suppress background light reflections but reduce efficiency and increase power consumption.
Innovation Solution
A display apparatus utilizing a micro-LED array aligned with catadioptric optical elements and a low reflection screen with a light absorbing structure, featuring a transparent support substrate and light transmitting apertures, to minimize reflections and enhance luminance efficiency, allowing for high contrast and uniformity in high ambient luminance environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black resin material is used to suppress background light reflections, then contrast is improved, but light absorption increases and efficiency decreases
Solution Approach 1:
The front surface is segmented into multiple functional layers: AR coating layer for reflection reduction, AG layer for diffusion, and black resin material for absorption. Each layer handles a specific aspect of light management, allowing the system to achieve high contrast without excessive light absorption by distributing functions across multiple specialized components.
Solution Approach 2:
Different regions of the front surface have different optical properties: the AR coating provides anti-reflection in specific wavelength ranges, the AG layer provides diffusion in specific areas, and the black resin material provides absorption in specific zones. This local differentiation allows optimal performance for each function while minimizing overall energy loss.
2Object-affected harmful factors
If AR coating is applied to reduce reflected luminance, then contrast is improved, but cost increases and damage susceptibility increases
Solution Approach 1:
The front surface uses a composite structure combining AR coating, AG layer, and black resin material. This composite approach provides the reflection reduction benefits of AR coatings while the additional layers (particularly the AG layer and black resin) provide mechanical protection and durability, reducing the susceptibility to damage of the delicate AR coating.
3Stability of the object's composition
If AG layer is used to diffuse reflected light, then uniformity is improved, but image resolution decreases and contrast degrades
Solution Approach 1:
The AG layer provides partial diffusion rather than complete diffusion of reflected light. By controlling the diffusion degree, the system achieves sufficient uniformity to mask reflections and improve perceived evenness, while maintaining enough image detail and resolution for acceptable quality. The diffusion is applied selectively to reflected ambient light rather than all light paths.
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 provides high contrast and luminance efficiency while reducing power consumption, achieving a perceived visual contrast ratio of over 3000:1 in indoor environments and maintaining contrast in outdoor conditions with significantly reduced ambient light reflections.
Implementation Method 1
at least one image pixel array relay structure comprising: a plurality of micro-LEDs arranged to output light
Implementation Method 2
a plurality of catadioptric optical elements arranged in a catadioptric optical element array, wherein each of the catadioptric optical elements of the plurality of catadioptric optical elements is aligned in correspondence with a respective one or more of the micro-LEDs
Implementation Method 3
a low reflection screen comprising a light absorbing structure arranged on a side of a transparent support substrate wherein the light absorbing structure comprises a plurality of light transmitting apertures arranged in an aperture array
Data Source
AI summary
A display apparatus comprises an array of micro-LEDs and an aligned array of catadioptric optical elements wherein the array of micro optics is further aligned to an array of apertures of a low reflection screen. Advantageously such an arrangement provides a display with large images of configurable size, low cost and high brightness that can achieve high contrast in high illuminance from ambient lighting while also achieving high luminous efficiency.