Light Source Module Using Composite LED and Filter Wheel

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Solution Overview

Problem

Conventional projectors require multiple light sources for different colors, leading to increased volume and inefficiency due to the limited energy utilization of halogen lamps and the complexity of LED light source arrays.

Innovation Solution

A light source module utilizing a filter wheel with a composite light source and a third light source, along with a dichroic mirror, to produce three primary colors through additive mixing, reducing the number of light sources needed by using a composite light source and a third light source that emit complementary colors, with the filter wheel rotating to switch between color filter areas and a light transmitting area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If three separate LED light source arrays (red, green, blue) are used to achieve full color display, then color quality is improved, but the volume of the projector increases and device complexity increases

Engineering Contradiction:

Improvecolor qualityVSAvoidprojector volume

Core Design Contradiction:

Illumination intensityVSVolume of moving object

Solution Approach 1:

The patent combines red and green LED light sources into a single composite light source that emits both colors simultaneously. This merging of light sources reduces the total number of separate light source arrays from three to two, thereby reducing the projector volume while maintaining the ability to produce full color display through the composite light and blue light from the third light source

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The composite light source serves multiple functions by emitting both red and green light simultaneously, eliminating the need for separate red and green LED arrays. This multi-functional light source reduces device complexity and volume while maintaining color display capability

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Illumination intensity

If three separate LED light source arrays are used to achieve full color display, then color quality is improved, but device complexity increases

Engineering Contradiction:

Improvecolor qualityVSAvoidlight source array complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The patent merges red and green LED light sources into a single composite light source, reducing the number of separate light source arrays from three to two. This simplification reduces device complexity while maintaining color display quality through the combined output of the composite light source and the third blue light source

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The composite light source is designed to emit multiple colors (red and green) simultaneously, making it a multi-functional light source that replaces what would traditionally require two separate light source arrays, thereby reducing overall device complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Ease of manufacture

If halogen lamps are used as light sources, then ease of manufacture is improved, but energy utilization is worsened and lifetime is reduced

Engineering Contradiction:

Improvelight source manufacturingVSAvoidenergy utilization rate

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent adopts LED light sources which, while requiring slightly more complex manufacturing than halogen lamps, provide significantly improved energy utilization (converting more energy to light rather than heat) and longer lifetime. The composite light source design further optimizes energy efficiency by reducing the total number of light sources needed

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 solution allows for the production of three primary colors using only two light sources, reducing the volume of the projector and improving energy utilization by overlapping the switching intervals of the composite and third light sources, enhancing color saturation and brightness.

Implementation Method 1

the filter wheel rotates to make the first color filter area correspond to a filtered light path, the composite light source emits the composite light to the first color filter area for filtering to obtain a first color light

Methodology Applied

Scientific EffectOptical filtering: Filter (optical)

Implementation Method 2

a dichroic mirror disposed between the composite light source and the filter wheel, wherein the dichroic mirror allows the composite light to transmit therethrough and toward the filter wheel, wherein the third color light is reflected and guided to the filter wheel by the dichroic mirror

Methodology Applied

Scientific EffectDichroic reflection: Dichroic Filter

Implementation Method 3

The composite light source is disposed on one side of the filter wheel and emits a composite light consisting of a first color light and a second color light

Methodology Applied

Scientific EffectAdditive color mixing:

Data Source

PatentUS10795247B2Light source module and projector using the same

Publication Date: 2020.10.06 BENQ CORP

AI summary

A light source module includes a filter wheel, a composite light source, and a third light source. The filter is rotatable with respect to a pivot and includes a first color filter area, a second color filter area, and a light transmitting area. The composite light source emits a composite light consisting of a first and second color lights.