Light Shielding Plate Blocks Optical Feedback in Laser Display
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Solution Overview
Problem
Current image display apparatus using laser light sources face challenges in achieving high-performance due to optical feedback, which increases temperature and affects the lifespan and optical properties of the light source.
Innovation Solution
Incorporating a light shielding plate with apertures in the optical system to shield reflection light from the reflection type light modulator, ensuring that split light beams effectively reach the light modulator while preventing optical feedback to the light source, and optionally using a polarization conversion element and high thermal conductivity materials to enhance light use efficiency and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a laser light source is used in an image display apparatus, then high brightness and long lifespan are achieved, but optical feedback from the light modulator causes temperature increase and reduces reliability
Solution Approach 1:
The patent extracts and blocks the harmful optical feedback path by introducing a light shielding plate with a specific aperture structure. The shielding plate is positioned to block reflected light from the light modulator from returning to the laser light source, while the aperture allows the necessary light beam to pass through. This separates the useful light path from the harmful feedback path, resolving the contradiction between maintaining laser operation and preventing optical feedback damage.
Solution Approach 2:
The light shielding plate acts as an intermediary element between the laser light source and the light modulator. It selectively blocks harmful reflected light while allowing the forward-propagating light beam to pass through the aperture. This intermediary structure enables the system to maintain the benefits of laser light sources while protecting against their vulnerability to optical feedback.
2Reliability
If a light shielding plate is introduced to block optical feedback, then light source reliability is improved, but the optical system complexity increases
Solution Approach 1:
The light shielding plate is designed to serve multiple functions simultaneously: it blocks optical feedback to protect the laser light source, while its aperture allows the light beam to pass through to the light modulator. This multi-functional design reduces the need for separate components for shielding and light transmission, thereby minimizing the increase in system complexity while maintaining improved reliability.
3Use of energy by moving object
If the aperture size is increased to allow more light through, then light use efficiency is improved, but optical feedback shielding effectiveness is reduced
Solution Approach 1:
The light shielding plate features a locally optimized aperture with specific dimensional characteristics. The aperture size and shape are precisely controlled to allow sufficient light transmission for efficient system operation while maintaining the shielding effectiveness against optical feedback. This local quality optimization at the aperture location resolves the contradiction between light transmission efficiency and feedback blocking effectiveness.
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 high-performance image display apparatus with reduced optical feedback, maintaining the long lifespan of the laser light source and minimizing maintenance costs by preventing temperature-related issues.
Implementation Method 1
a light shielding plate that is provided in the optical system, the light shielding plate including an aperture provided on a path of each of the plurality of split light beams, and a light shielding portion that shields reflection light from the reflection type light modulator to the light source section
Implementation Method 2
The optical system divides light from the light source section into a plurality of split light beams, superimposes the plurality of split light beams on the one or more reflection type light modulators
Implementation Method 3
The one or more reflection type light modulators modulate and reflect incident light
Data Source
AI summary
An image display apparatus according to an embodiment of the present technology includes a light source section, one or more reflection type light modulators, an optical system, and a light shielding plate. The light source section includes at least one or more laser light sources. The one or more reflection type light modulators modulate and reflect incident light. The optical system splits light from the light source section into a plurality of split light beams, superimposes the plurality of split light beams on the one or more reflection type light modulators, and causes them to enter. The light shielding plate is provided in the optical system and includes an aperture provided on a path of each of the plurality of split light beams and a light shielding portion that shields reflection light from the reflection type light modulator to the light source section.