Micro LED Projection Device with Integrated Color Combiner Prism
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Solution Overview
Problem
Current projection devices utilize multiple discrete light sources and light combining elements, resulting in a large size and high cost.
Innovation Solution
A projection device design that employs a single color combiner prism and two micro LED panels, each emitting different color lights, to generate an image light, thereby eliminating the need for multiple light combining elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple discrete light sources and multiple light combining elements are used, then the image quality can be maintained, but the device size and cost increase
Solution Approach 1:
The patent merges multiple light combining elements into a single integrated color combiner prism. This single prism combines multiple color lights (red, green, blue) that would traditionally require separate combining elements, thereby reducing the overall device size and component count while maintaining the necessary light combination functionality for image generation
Solution Approach 2:
The color combiner prism serves multiple functions simultaneously: it combines multiple color lights, acts as a beam combiner, and integrates the functions of what would traditionally require separate optical elements. This multi-functionality allows the system to maintain image quality while reducing device complexity
2Reliability
If multiple discrete light sources and light combining elements are used, then the projection function can be achieved, but the manufacturing cost increases
Solution Approach 1:
By combining multiple light combining elements into a single color combiner prism, the patent reduces the number of components that need to be manufactured, assembled, and aligned. This integration simplifies the manufacturing process and reduces costs while maintaining the projection function through the unified design
3Device complexity
If a single light combining element is used, then the device size and cost are reduced, but the light combination capability must be optimized
Solution Approach 1:
The color combiner prism is designed to perform multiple light combination functions within a single element. It is engineered to combine multiple color lights with precise optical paths, integrating the capabilities of what would traditionally require multiple separate combining elements, thereby maintaining light combination capability while reducing device size
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 results in a compact and cost-effective projection device capable of generating high-quality image light with controllable luminance and chromaticity.
Implementation Method 1
The color combiner prism is disposed on a path of the first color light, the second color light, and the third color light to generate an image light
Implementation Method 2
The projection lens is disposed on a path of the image light, and the image light passes through the projection lens and then exits the projection device
Data Source
AI summary
A projection device including a first micro light emitting diode (micro LED) panel, a second micro LED panel, a color combiner prism, and a projection lens is provided. The first micro LED panel includes multiple first micro LEDs arranged in an array. The second micro LED panel includes multiple second micro LEDs and multiple third micro LEDs arranged in an array. The first micro LEDs, the second micro LEDs, and the third micro LEDs respectively emit a first color light, a second color light, and a third color light that are different from each other. The color combiner prism is disposed on a path of the first color light, the second color light, and the third color light to generate an image light. The projection lens is disposed on the path of the image light, and the image light passes through the projection lens and then exits the projection device.