Projection Display Device Thermal Management via Housing Integration

Solution Overview

Problem

Existing projection display devices face challenges in achieving a small-sized design while maintaining effective heat radiation performance, leading to increased size, weight, and cost due to large heat radiation members.

Innovation Solution

The use of substrates with high thermal conductivity materials, such as aluminum or magnesium alloys, and insulation layers to enhance heat conduction from light sources to a housing with a large outer surface area for efficient air radiation, eliminating the need for a special heat sink.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a large light source radiating member is used, then heat radiation performance is improved, but device size, weight, and cost increase

Engineering Contradiction:

Improveheat radiation performanceVSAvoiddevice weight

Core Design Contradiction:

TemperatureVSWeight of stationary object

Solution Approach 1:

The housing is designed to serve dual functions: as the structural enclosure and as the heat radiation member. The housing includes heat radiation portions with enlarged surface area that directly radiate heat from the light source, eliminating the need for a separate dedicated heat radiation member. This merging of functions reduces device weight, size, and component count while maintaining effective heat radiation performance.

Inventive Principle:

Principle #5Merging (Combining)

2Temperature

If a large light source radiating member is used, then heat radiation performance is improved, but device size increases

Engineering Contradiction:

Improveheat radiation performanceVSAvoiddevice size

Core Design Contradiction:

TemperatureVSVolume of moving object

Solution Approach 1:

The housing is designed to serve dual functions: as the structural enclosure and as the heat radiation member. The housing includes heat radiation portions with enlarged surface area that directly radiate heat from the light source, eliminating the need for a separate dedicated heat radiation member. This merging of functions reduces device weight, size, and component count while maintaining effective heat radiation performance.

Inventive Principle:

Principle #5Merging (Combining)

3Temperature

If a large light source radiating member is used, then heat radiation performance is improved, but manufacturing cost increases

Engineering Contradiction:

Improveheat radiation performanceVSAvoidmanufacturing cost

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The housing is designed to serve dual functions: as the structural enclosure and as the heat radiation member. The housing includes heat radiation portions with enlarged surface area that directly radiate heat from the light source, eliminating the need for a separate dedicated heat radiation member. This merging of functions reduces device weight, size, and component count while maintaining effective heat radiation performance.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If insulation layers are used on substrates, then electrical insulation is improved, but heat conduction performance deteriorates

Engineering Contradiction:

Improveelectrical insulationVSAvoidheat conduction performance

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The substrate design incorporates localized non-insulation-layer parts that are in direct contact with the housing, creating thermal conduction paths at specific locations. These non-insulation parts are strategically positioned to maintain electrical insulation across the majority of the substrate while providing targeted thermal conduction interfaces where heat needs to be transferred to the housing for dissipation.

Inventive Principle:

Principle #3Local quality

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 approach reduces the device's size, weight, and cost by increasing heat conduction and radiation efficiency, effectively managing heat without a separate heat sink, thus suppressing temperature increases in the light sources.

Implementation Method 1

heat generated by the light sources is conducted to the substrates and then the housing

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

heat is actively radiated from the housing to the air

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Data Source

PatentEP3299886B1Projection display device

Publication Date: 2021.06.23 NIPPON SEIKI CO LTD

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AI summary

The present invention provides a projection display device in which size is reduced while the heat radiating function is preserved. This projection display device is provided with a first substrate (42) on which a red light source is mounted, a second substrate (44) on which a green light source is mounted, a third substrate (45) on which a blue light source is mounted, a housing (40) to which the first through third substrates are attached, an optical member accommodated inside the housing, and a light modulating element (30); light emitted inside the housing from the red light source, the green light source, and the blue light source being distributed by the optical member, the distributed light being converted to a prescribed display image by the light modulating element, and the light being projected outside the housing, wherein the projecting display device is characterized in that the first through third substrates are made of metal or of filler-containing plastic compounded with a filler having high thermal conductivity, and the housing is made of metal or a filler-containing plastic compounded a filler having high thermal conductivity.