Light Shaping Lens Oval Cross Section for Micro-Projectors
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Solution Overview
Problem
Existing LED light shaping systems for micro projectors face inefficiencies due to the mismatch between the rounded light emission of LEDs and the rectangular shape of micro-displays, leading to poor light efficiency and uniformity, and existing solutions often require multiple lenses, increasing the size of the projection system.
Innovation Solution
A light shaping lens with a light input surface, a reflective surface, and a light output surface featuring first and second curvatures that shape the light into an oval cross-section, allowing for efficient and uniform light distribution on rectangular micro-displays using a single lens, thereby reducing the size of the projector.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple lenses are used to shape LED light to match micro-display shape, then light efficiency and uniformity are improved, but device size increases
Solution Approach 1:
The patent combines multiple lens functions into a single integrated light shaping lens that performs both light collection and shaping functions. The lens includes a light input surface, a reflective surface, and a light output surface with specific curvatures, merging what would traditionally require multiple separate optical elements into one compact component.
Solution Approach 2:
The light shaping lens serves multiple functions simultaneously: it collects light from the LED source, shapes the light into an oval cross-section to match the rectangular micro-display, and directs light onto the display panel. This multi-functional design eliminates the need for separate lenses for each function.
2Productivity
If multiple lenses are used to shape LED light, then light uniformity on micro-display is improved, but device complexity increases
Solution Approach 1:
The patent integrates light collection and light shaping functions into a single lens structure, reducing the number of optical components and simplifying the overall optical system while maintaining uniform light distribution across the micro-display.
Solution Approach 2:
The light shaping lens features different curvature radii in different directions (first curvature radius in a first direction, second curvature radius in a second direction) to optimize light distribution locally across different regions of the micro-display, achieving uniform illumination through localized optical properties.
3Volume of moving object
If a single light shaping lens is used, then device size is reduced, but light efficiency and uniformity may deteriorate
Solution Approach 1:
The light shaping lens incorporates different curvature radii in different directions to optimize light distribution across the rectangular micro-display. The first curvature radius and second curvature radius are specifically designed to match the aspect ratio of the display panel, ensuring efficient and uniform light coverage despite the compact single-lens design.
Solution Approach 2:
The patent utilizes curved surfaces with specific curvature radii to shape the light from the LED source. The light output surface has a first curvature in a first direction and a second curvature in a second direction, creating an oval cross-section that efficiently illuminates the rectangular micro-display while maintaining light efficiency in a compact form factor.
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 uniformity and efficiency by directing more light onto the display panel, resulting in improved image projection quality and a more compact projector design.
Implementation Method 1
a reflective surface configured to reflect at least part of the light received by the light input surface
Implementation Method 2
a light output surface having a first curvature in a first direction and a second curvature in a second direction, wherein the light output surface is configured to emit the light that is received from the light input surface and reflected by the reflective surface
Implementation Method 3
the first curvature and the second curvature are configured to shape the light emitted from the light output surface such that the light emitted from the light output surface has an oval cross section
Data Source
AI summary
An LED light shaping device and illumination system are provided. According to one embodiment, a light shaping lens is configured to shape light emitted from a light source and direct the light on a display panel for projection. The light shaping lens comprises a light input surface configured to receive light emitted from the light source a reflective surface configured to reflect at least part of the light received by the light source; and a light output surface having a first curvature in a first direction and a second curvature in a second direction, wherein the light output surface is configured to emit the light that is received by the light input surface and reflected by the reflective surface, and wherein the first curvature and the second curvature are configured to shape the light such that the emitted light has an oval cross section.