Annular LED Array and Reflector for Projection Illumination
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Solution Overview
Problem
Conventional methods for harnessing light from multiple LEDs in projection televisions are inefficient, making it difficult to continuously project large video images, as single LEDs cannot produce enough light and existing techniques fail to effectively combine their output.
Innovation Solution
A system comprising multiple LEDs arranged in an annular formation, with optical components and a reflector to focus and combine light efficiently, allowing for the creation of a cohesive image by varying the duty cycle and color sequence of the LEDs to produce sufficient light for projecting large video images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple LEDs are used to produce sufficient light for large video images, then illumination intensity is improved, but device complexity increases due to the need for multiple LEDs and complex light combining mechanisms
Solution Approach 1:
The patent combines light from multiple LEDs (red, green, and blue LEDs) using optical components including lenses and a beam combining mirror to create a unified light output that illuminates the DMD chip, resolving the contradiction by merging multiple light sources into a coherent illumination system
Solution Approach 2:
The patent arranges LEDs in a specific spatial configuration around the DMD chip, with red LEDs positioned at one location, green LEDs at another, and blue LEDs at a third location, using dimensional spatial arrangement to combine light sources efficiently without excessive complexity
2Productivity
If conventional techniques are used to harness light from multiple LEDs, then device complexity is reduced, but productivity deteriorates due to extreme inefficiency in light combination
Solution Approach 1:
The patent introduces optical intermediaries including lenses for each LED type and a beam combining mirror that acts as a mediator to efficiently combine light from multiple LEDs into a unified beam that illuminates the DMD chip, dramatically improving light harnessing efficiency
Solution Approach 2:
The patent optimizes the optical parameters including focal lengths of lenses, distances between LEDs and optical components, and angles of incidence on the beam combining mirror to maximize light collection efficiency and minimize losses
3Device complexity
If a single LED is used to simplify the system, then device complexity is reduced, but illumination intensity deteriorates because it cannot produce enough light for large video images
Solution Approach 1:
The patent merges the output of multiple individual LEDs (red, green, and blue) into a single unified light beam that illuminates the entire DMD chip, achieving both simplified single-point illumination and the combined light output of multiple sources
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 described system enables the efficient combination of light from multiple LEDs, allowing a single LED to project large video images by reducing its duty cycle and using a reflector to synchronize the light output, resulting in a continuous and coherent image.
Implementation Method 1
a reflector configured to reflect light from at least one of the plurality of light emitting diodes (48)
Implementation Method 2
each of the optical components is configured to focus the produced light at the reflector
Data Source
AI summary
The disclosed embodiments relate to a system and method for projecting video onto a screen. A video unit (10) may comprise a plurality of light emitting diodes (40a, 40b, and 40c) disposed in an annular formation (41) and configured to produce light (44), a reflector configured to reflect the produced light from at least one of the plurality of light emitting diodes (40a, 40b, and 40c), and a plurality of optical components disposed in an annular formation, wherein each of the optical components corresponds to one of the light emitting diodes (40a, 40b, and 40c), wherein each of the optical components is configured to focus the produced light at the reflector.