Projection Display Optics With Misaligned Aperture Light Attenuation

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Solution Overview

Problem

Projection display devices using semiconductor lasers face issues with light saturation of light receiving sensors due to strong leakage light, leading to errors in light control, and the use of neutral density filters or integrating spheres increases cost and size.

Innovation Solution

Incorporating an opening member with misaligned openings between the reflection mirror and light receiving sensor to attenuate light, utilizing a diffusion member to scatter light, and maintaining alignment with the optical axis to prevent device enlargement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a neutral density filter or integrating sphere is provided between the reflection mirror and the light receiving sensor to attenuate light, then saturation of the light receiving sensor is prevented, but the projection display device becomes expensive and large in size

Engineering Contradiction:

Improvelight receiving sensor saturation preventionVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

An opening member with a specific opening is introduced as an intermediary component between the reflection mirror and the light receiving sensor. This opening member attenuates the leakage light through its opening structure, preventing sensor saturation without requiring expensive neutral density filters or large integrating spheres.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The opening member changes the optical parameters of the leakage light by selectively blocking certain light paths while allowing others to pass through the opening. This parameter change approach attenuates the light intensity to appropriate levels without requiring additional filtering materials or large optical components.

Inventive Principle:

Principle #35Parameter changes

2Reliability

Engineering Contradiction:

Improvelight receiving sensor saturation preventionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The opening member is implemented as a simple, inexpensive structural component rather than using expensive neutral density filters or integrating spheres. This approach significantly reduces manufacturing costs while achieving the same light attenuation function.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The opening member serves as a cost-effective intermediary that performs the light attenuation function without requiring expensive optical materials or complex manufacturing processes associated with traditional solutions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Illumination intensity

If the opening of the opening member is aligned with the optical axis, then light attenuation is achieved, but the device structure becomes more complex

Engineering Contradiction:

Improvelight attenuationVSAvoidoptical alignment complexity

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The opening member is positioned asymmetrically such that its opening is deliberately misaligned from the optical axis. This asymmetric positioning simplifies the overall device structure and manufacturing while still achieving effective light attenuation through the opening.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

Instead of aligning the opening with the optical axis as traditionally expected, the opening is intentionally misaligned. This inverted approach to optical alignment simplifies the device structure and reduces manufacturing complexity while maintaining the light attenuation function.

Inventive Principle:

Principle #13The other way round (Inversion)

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

Effectively attenuates light without increasing device size, ensuring accurate light control and chromaticity adjustment while reducing costs compared to neutral density filters or integrating spheres.

Implementation Method 1

an opening member that is provided between the reflection mirror and the light receiving sensor and has an opening through which the light having passed through the reflection mirror passes. The opening member is positioned on an optical axis of the light that passes through the reflection mirror. The opening of the opening member is positioned to be misaligned from the optical axis of the light that passes through the reflection mirror

Methodology Applied

Scientific EffectLight attenuation through misaligned opening:

Implementation Method 2

a reflection mirror that has a reflecting surface reflecting light emitted from the light source in a predetermined direction

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS20260023311A1Projection display device

Publication Date: 2026.01.22 SHARP NEC DISPLAY SOLUTIONS LTD

AI summary

A projection display device includes a light source, a reflection mirror that has a reflecting surface reflecting light emitted from the light source in a predetermined direction, a light receiving sensor that detects an output of the light having passed through the reflection mirror, and an opening member that is provided between the reflection mirror and the light receiving sensor and has an opening through which the light having passed through the reflection mirror passes. The opening member is positioned on an optical axis of the light that passes through the reflection mirror. The opening of the opening member is positioned to be misaligned from the optical axis of the light that passes through the reflection mirror.