Inclined Substrate Semiconductor Light Emitting Devices for Compact Projection
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Solution Overview
Problem
Conventional image projection devices face challenges with size, complexity, heat generation, and cost due to the use of lamps as light sources, which require bulky optical systems and separate cooling devices, and struggle to produce high-quality, compact, and cost-effective images with desired color gamut and contrast ratios.
Innovation Solution
An image projection device utilizing a light source with semiconductor light emitting devices that emit condensed light at specific beam angles, reducing the need for additional optical components and cooling systems, and enabling direct generation of color images with high brightness and contrast ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a lamp light source is used with a Fresnel lens to condense light, then light condensation is achieved, but the size and unit cost of the optical member increase
Solution Approach 1:
The patent extracts the light condensation function from the Fresnel lens and integrates it directly into the semiconductor light emitting device structure. The inclined substrate configuration enables the semiconductor devices to emit condensed light at specific angles without requiring a separate Fresnel lens, thereby achieving light condensation while reducing optical member size.
Solution Approach 2:
The patent merges the light emission and light condensation functions into a single integrated structure. The semiconductor light emitting devices are configured with inclined substrates that simultaneously serve as both the emission source and the condensation mechanism, eliminating the need for separate optical components and reducing overall device size.
2Illumination intensity
If a parabolic reflector is arranged to surround the lamp light source to obtain condensed light, then light condensation is achieved, but the size and thickness of the optical member increase
Solution Approach 1:
The patent extracts the light condensation function from the parabolic reflector and integrates it directly into the semiconductor light emitting device structure. The inclined substrate configuration enables the semiconductor devices to emit condensed light at specific angles without requiring a separate parabolic reflector, thereby achieving light condensation while reducing optical member thickness.
Solution Approach 2:
The patent changes the approach from using a three-dimensional parabolic reflector surrounding the light source to a two-dimensional inclined substrate configuration. This dimensional change allows light condensation to be achieved in a planar configuration that reduces the thickness of the optical member while maintaining the condensation effect.
3Reliability
If conventional optical systems use numerous mirrors or lenses to create images, then image creation is achieved, but the structure becomes very complex and bulky
Solution Approach 1:
The patent enables the semiconductor light emitting devices to perform self-service by emitting condensed light at specific angles through the inclined substrate configuration. This self-service capability eliminates the need for additional mirrors or lenses to direct and focus light, thereby simplifying the optical system structure while maintaining image creation capability.
Solution Approach 2:
The patent changes the emission parameters of the light source by configuring the semiconductor devices to emit light at specific angles through the inclined substrate. This parameter change allows the light to be naturally directed and focused without requiring complex optical components, thereby reducing device complexity while maintaining image creation capability.
4Illumination intensity
If a lamp light source is used, then high brightness is achieved, but a lot of heat is generated requiring separate cooling devices
Solution Approach 1:
The patent replaces the thermal-based lamp light source with a semiconductor-based light emitting device that uses electroluminescence to generate light. This substitution eliminates the need for thermal heating and separate cooling devices, as semiconductor devices generate significantly less heat while maintaining high brightness through electrical-to-optical energy conversion.
Solution Approach 2:
The patent changes the operating parameters of the light source from thermal-based operation (lamp) to electrical-based operation (semiconductor). This parameter change fundamentally alters the energy conversion process, reducing heat generation while maintaining brightness through direct electrical-to-optical conversion in the semiconductor devices.
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, lightweight, and cost-effective image projection device capable of producing high-quality images with excellent color gamut and contrast ratios, eliminating the need for separate cooling systems and reducing the complexity of the optical system.
Implementation Method 1
a plurality of semiconductor light emitting devices in the plurality of pixels of the substrate, respectively
Data Source
AI summary
An image projection device can comprise a light source configured to output light corresponding to an image, and an optical system disposed in front of the light source and configured to project the image.The light source can comprise a substrate comprising a plurality of pixels and a plurality of semiconductor light emitting devices in the plurality of pixels of the substrate, respectively. The substrate can be disposed to be inclined with respect to the optical system, and the semiconductor light emitting device can emit a first condensed light having a first beam angle inclined with respect to the substrate.