Non-Parallel Dichroic Films for LED Illumination
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Solution Overview
Problem
Current projection apparatuses suffer from low light-utilization efficiency and poor space-efficiency due to the design of dichroic mirrors that cross each other, leading to light loss and bulky components, especially when using LEDs instead of ultra-high pressure lamps.
Innovation Solution
The use of a non-crossing, non-parallel arrangement of dichroic films in a chip package with LEDs of different colors, where each dichroic film is positioned to reflect or transmit specific light beams, forming an illumination beam with improved light path alignment and space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If dichroic mirrors are arranged in a crossing configuration to combine different color beams, then light beam combination is achieved, but light loss increases due to adhesive regions and space efficiency deteriorates resulting in bulky projection apparatus
Solution Approach 1:
The patent divides the single crossing X-mirror into multiple separate dichroic mirrors (first dichroic mirror for red light, second dichroic mirror for green light, third dichroic mirror for blue light). Each mirror is positioned independently at different locations and angles, eliminating the need for adhesive regions between mirrors and reducing light loss while maintaining the function of combining different color beams.
Solution Approach 2:
The patent transitions from a two-dimensional crossing arrangement (X-mirror with perpendicular mirrors) to a three-dimensional spatial distribution of multiple dichroic mirrors. The mirrors are arranged at different positions and orientations in space, allowing light beams from LEDs to be combined without requiring the beams to cross, thus eliminating adhesive regions and improving light utilization efficiency.
2Ease of manufacture
If dichroic mirrors are arranged in a crossing configuration to combine different color beams, then light beam combination is achieved, but device volume increases resulting in bulky projection apparatus
Solution Approach 1:
The patent segments the crossing mirror structure into multiple independent dichroic mirrors positioned at different locations. This segmentation allows for more efficient spatial arrangement, reducing the overall volume required for the light combination system while maintaining the functionality of combining red, green, and blue light beams from separate LED sources.
Solution Approach 2:
By transitioning from a planar crossing arrangement to a three-dimensional configuration of multiple dichroic mirrors, the patent achieves more compact component placement. The mirrors are positioned and oriented in space to combine light beams without requiring large horizontal or vertical spaces, thus reducing the overall projection apparatus size.
3Use of energy by moving object
If LEDs are used instead of ultra high pressure lamps as light source, then energy efficiency is improved, but light loss increases due to larger adhesive region area relative to light beam cross-sectional area
Solution Approach 1:
The patent segments the light combination function into multiple separate dichroic mirrors, each handling a specific color wavelength range. This eliminates the need for large adhesive regions that would be required in a crossing mirror configuration, thereby reducing light loss while maintaining the energy efficiency benefits of using LED light sources.
Solution Approach 2:
The patent uses three-dimensional spatial arrangement of multiple dichroic mirrors to combine light beams from LEDs without requiring the beams to cross. This approach minimizes the relative area of adhesive regions compared to the light beam cross-sectional area, reducing light loss while preserving the energy efficiency advantages of LED technology.
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
This configuration enhances light-utilization efficiency by eliminating ineffective light-deflecting regions and allows for more compact component placement, reducing the overall size of the projection apparatus while maintaining high image quality.
Implementation Method 1
the first dichroic film is capable of reflecting the first light beam and transmitting the second light beam
Implementation Method 2
the first dichroic film is capable of reflecting the first light beam and transmitting the second light beam, the second dichroic film is capable of reflecting the second light beam
Implementation Method 3
the second dichroic film is capable of reflecting the second light beam, the first dichroic film and the second dichroic film are capable of transmitting the third light beam
Implementation Method 4
the third dichroic film is capable of reflecting the third light beam
Data Source
AI summary
An illumination system includes a chip package, a first dichroic film, a second dichroic film, and a third dichroic film. The first dichroic film, the second dichroic film, and the third dichroic film are not parallel to each other and do not cross each other. The chip package includes a first light-emitting chip capable of emitting a first light beam, a second light-emitting chip capable of emitting a second light beam, and a third light-emitting chip capable of emitting a third light beam. The first light-emitting chip, the second light-emitting chip, and the third light-emitting chip are arranged in a row. The first dichroic film reflects the first light beam and transmitting the second light beam, the second dichroic film reflects the second light beam, the first dichroic film and the second dichroic film transmit the third light beam, and the third dichroic film reflects the third light beam.