Light Blocking Member for Projection Displays
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Solution Overview
Problem
Projection video display devices face issues with stray light generation due to unnecessary light, leading to deterioration and reduced video quality, as existing light blocking solutions either absorb and convert light into heat, causing local overheating or reflect light inefficiently.
Innovation Solution
A light blocking member with a first light blocking portion that absorbs unnecessary light and converts it into heat, combined with a reflector that reflects unabsorbed light, enhancing heat dissipation and reducing stray light by dispersing energy as reflected light rather than heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a light blocking film made of black material is used to block unnecessary light, then stray light is reduced, but the absorbed light converts to heat causing local temperature increase and potential deterioration of the light blocking film and peripheral members
Solution Approach 1:
The light blocking function is divided into two separate components: a light blocking film that absorbs light and a heat dissipation member that receives and dissipates the generated heat. This segmentation allows the light blocking film to focus on blocking stray light while the heat dissipation member handles thermal management, preventing local temperature increase of the light blocking film.
Solution Approach 2:
The heat dissipation member acts as an intermediary between the light blocking film and the environment. It receives heat from the light blocking film through thermal conduction and dissipates it to the surroundings, serving as a mediator that transfers thermal energy away from the light blocking film to prevent overheating and deterioration.
2Temperature
If a light blocking unit with high reflectance material is used to reflect unnecessary light, then heat generation is reduced, but reflectance of 80% or more is required which limits material selection and may not sufficiently block all stray light
Solution Approach 1:
The invention changes the approach from relying on high reflectance (80% or more) to using a combination of light absorption and heat dissipation. The light blocking film uses materials with appropriate absorption characteristics, and the system parameters are optimized to balance absorption efficiency with heat dissipation capability, rather than strictly requiring high reflectance materials.
3Object-generated harmful factors
If unnecessary light is absorbed and converted into heat locally, then stray light is reduced, but the overheated light blocking film or peripheral members may be deteriorated
Solution Approach 1:
The system is segmented into a light blocking film responsible for absorbing stray light and a heat dissipation member responsible for thermal management. This functional segmentation prevents the light blocking film from overheating and deteriorating, as the heat dissipation member handles the thermal load.
Solution Approach 2:
The harmful heat generated by light absorption is converted into a manageable parameter by introducing the heat dissipation member. The heat that would otherwise cause deterioration is now efficiently transferred and dissipated, turning a potentially harmful effect into a controlled thermal management issue.
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
The solution effectively reduces stray light and enhances heat dissipation in projection video display devices, preventing local overheating and improving video quality by dispersing energy efficiently.
Implementation Method 1
a first light blocking portion that absorbs and converts into heat a part of unnecessary light unnecessary for the projection lens in the video light
Implementation Method 2
a reflector that reflects, as reflected light, light that is a part of the unnecessary light and that is not absorbed by the first light blocking portion
Data Source
AI summary
A light blocking member according to the present disclosure is for a projection video display device provided with an optical system that projects video light and a projection lens on which the video light is incident, the light blocking member being disposed between the optical system and the projection lens, the light blocking member including: a first light blocking portion that absorbs and converts into heat a part of unnecessary light unnecessary for the projection lens in the video light; and a reflector that reflects, as reflected light, light that is a part of the unnecessary light and that is not absorbed by the first light blocking portion.