Projection Illumination System Uniform Color Distribution

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Solution Overview

Problem

Existing projection devices face challenges with uneven color distribution due to complex light-combining path structures when using multiple sets of solid-state light sources.

Innovation Solution

The illumination system incorporates a first and second light source module, light guide modules, a condenser lens module, and a light homogenizing element to generate and combine color light beams, with the second light guide module separating the light beams into sub-beams to achieve a uniform aspect ratio and consistent angles for effective light homogenization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If multiple sets of solid-state light sources are used to generate basic three-color light, then the luminous efficiency is improved, but the light-combining path structure becomes complex and color distribution becomes uneven

Engineering Contradiction:

Improveluminous efficiencyVSAvoidlight-combining path structure

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The illumination system divides the light combining process into separate stages: first light guide modules collect light from individual LED chips, second light guide modules redirect light at specific angles, and a light homogenizing element finalizes the uniform distribution. This segmentation allows each component to handle a specific portion of the light path, reducing overall system complexity while maintaining high luminous efficiency from multiple LED sources.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Light guide modules serve as intermediary components between the multiple LED light sources and the final illumination output. These intermediaries redirect and redistribute light from the complex multi-source configuration into a unified, uniform light beam, effectively mediating the transition from multiple independent sources to a homogeneous output without requiring complex direct combining structures.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If multiple sets of light sources are used to improve color generation, then the color coverage is improved, but the color distribution uniformity deteriorates

Engineering Contradiction:

Improvecolor coverageVSAvoidcolor distribution uniformity

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The light homogenizing element applies local quality transformation by treating different portions of the light beam differently. It receives light with varying color distributions from multiple LED sources and locally adjusts each region's color composition to achieve overall uniformity. This allows the system to maintain broad color coverage from diverse LED sources while producing uniform color distribution in the final output.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The illumination system changes the spatial distribution parameters of light from multiple sources through light guide modules that redirect light at specific angles and a light homogenizing element that redistributes light uniformly. These parameter transformations convert the directional and non-uniform light output from multiple LEDs into a uniform, omnidirectional illumination beam with consistent color distribution across the entire output area.

Inventive Principle:

Principle #35Parameter changes

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 results in a more uniform color distribution for both the illuminating light beam and the image beam, ensuring consistent energy distribution and improved projection quality.

Implementation Method 1

light guide modules, a condenser lens module, and a light homogenizing element to generate and combine color light beams

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Implementation Method 2

condenser lens module is disposed on the transmission path of the first to the sixth color light beams

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS20250088612A1Illumination system and projection device

Publication Date: 2025.03.13 QISDA CORP

AI summary

An illumination system is provided. The first light guide module is configured to transmit a first to sixth color light beams from the first light source module and the second light source module to the second light guide module. The second light guide module is configured to transmit the first to sixth color light beams from the first light guide module to the condenser lens module. The second light guide module is further configured to separate the first to sixth color light beams respectively into a first sub-light beam and a second sub-light beam, so that an aspect ratio of a light spot formed by the first sub-light beams and the second sub-light beams incident on a light incident surface of the condenser lens module falls within a range of 1 to 1.5. A projection device is also provided.