Projection Display Thermal Segmentation for Brightness Stability

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Solution Overview

Problem

Projection-type display devices, such as head-up displays (HUDs) for vehicles, face challenges in maintaining image brightness and visibility under varying temperature conditions and power restrictions, as the light emission intensity of semiconductor light sources like LEDs and lasers decreases with temperature increases, leading to reduced visibility in bright environments.

Innovation Solution

A projection-type display device with multiple light sources emitting different colors, where the light source with the maximum change in light emission intensity relative to temperature is positioned to minimize heat effects by using a larger heat sink, and other light sources with smaller heat sinks are strategically placed to manage heat dissipation effectively, ensuring consistent visibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the light emission intensity of the light source is increased to increase the brightness of the displayed image, then the brightness is improved, but the heat generation increases and light emission intensity decreases due to temperature rise

Engineering Contradiction:

Improvebrightness of displayed imageVSAvoidtemperature of light source

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent segments the heat dissipation function by providing separate radiation members for different light sources. The first radiation member is specifically dedicated to the first light source that generates significant heat, while other light sources have different radiation members. This segmentation allows targeted heat management for each light source based on its thermal characteristics.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by making the first radiation member have a larger surface area compared to radiation members for other light sources. This localized enhancement of heat dissipation capacity is applied specifically where needed (at the first light source with maximum temperature dependence) rather than uniformly across all light sources, optimizing heat management efficiency.

Inventive Principle:

Principle #3Local quality

2Illumination intensity

If the light emission intensity is increased under power restriction, then visibility should be improved, but heat generation limits the ability to increase brightness

Engineering Contradiction:

Improvelight emission intensityVSAvoidheat generation

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The patent converts the harmful effect of heat generation into a manageable parameter by designing radiation members that efficiently dissipate heat. The larger first radiation member transforms the heat problem into a controlled thermal management solution, allowing the system to operate at higher light emission intensities without excessive temperature rise, thus converting the heat loss into an acceptable operational condition.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Device complexity

If the first light source is positioned closer to other light sources, then device compactness is improved, but heat from other light sources affects the first light source and reduces visibility

Engineering Contradiction:

Improvespatial arrangement of light sourcesVSAvoidvisibility of displayed image

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The patent introduces the first radiation member as an intermediary between the first light source and other light sources. This radiation member serves as a thermal barrier that protects the first light source from heat generated by other light sources, allowing closer spatial arrangement while maintaining the temperature sensitivity of the first light source. The radiation member mediates thermal interaction between light sources.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 ensures sufficient visibility of the displayed image regardless of environmental conditions by effectively managing heat dissipation and maintaining light emission intensity, even in high-temperature environments and power-restricted situations.

Implementation Method 1

a first radiation member that radiates heat generated from a first light source, which has a maximum change in light emission intensity relative to a change in temperature

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 2

a second radiation member that radiates heat generated from a second light source, which is other than the first light source

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Data Source

PatentUS10168604B2Projection-type display device and heat dissipation method

Publication Date: 2019.01.01 FUJIFILM CORP

AI summary

A projection-type display device includes: R, G, and B light sources that emit light beams with different colors; a projection unit that projects light beams based on image information among light beams emitted from the light sources onto a projection screen; a heat sink that radiates heat generated from the R light source, which has a maximum change in light emission intensity relative to a change in temperature, among the light sources; and a heat sink that radiates heat generated from the G and B light sources and that has a surface area smaller than that of the heat sink. In a use state, the R light source is disposed on a side apart from the other light sources in a direction opposite to a direction of gravitational force.