Multi-projection Light Shielding Plate with Gradation Coating
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Solution Overview
Problem
Existing multi-projection devices face issues with high brightness at the combined image parts due to light scattering and spectral diffraction caused by sawtooth-shaped light shielding plates with numerous edges, which fail to uniformly attenuate brightness, leading to striped high-brightness areas.
Innovation Solution
A multi-projection device with a light shielding plate featuring a sawtooth shape and gradation coating that smoothly decreases white-light transmittance away from the edge, reducing the number of edges and preventing light scattering and spectral diffraction, combined with a curve and position adjusting mechanism to fit the projector's optical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light shielding plate with sawtooth-shaped ends is used to attenuate brightness at the combined image part, then the brightness uniformity is improved, but light scattering and spectral diffraction occur causing striped high brightness parts
Solution Approach 1:
The invention changes the physical parameters of the light shielding plate by applying a gradient absorption coating that varies the light absorption coefficient continuously from one end to the other. This gradient parameter change allows smooth brightness attenuation without the discrete edges that cause diffraction, resolving the contradiction between brightness uniformity and light scattering.
Solution Approach 2:
The invention uses a composite structure combining the transparent substrate with a gradient absorption coating layer. This composite material approach allows the plate to maintain transparency while providing controlled light attenuation through the gradient coating, eliminating the need for sawtooth edges and their associated diffraction problems.
2Illumination intensity
If multiple thin-plate filters are laminated to achieve gradual brightness attenuation, then the brightness control is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention merges multiple filtering functions into a single integrated component by applying a gradient absorption coating directly on the transparent substrate. This consolidation replaces the need for multiple separate thin-plate filters, reducing structural complexity while maintaining the gradual brightness attenuation effect.
Solution Approach 2:
Instead of stacking multiple filters with discrete transmission steps, the invention implements a continuous parameter change through the gradient absorption coating. This allows smooth brightness attenuation in a single layer, simplifying the overall structure while achieving the same functional effect.
3Illumination intensity
If the light shielding plate is placed in the optical path to attenuate brightness, then the brightness of combined part is equalized, but transient characteristics distortion occurs due to the condenser lens
Solution Approach 1:
The invention introduces a specially designed light shielding plate with gradient absorption coating as an intermediary element in the optical path. This mediator provides the necessary brightness attenuation while its optimized design minimizes interference with the condenser lens function, reducing transient characteristics distortion compared to conventional light shielding approaches.
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 prevents high brightness in the combined image areas and surroundings by smoothly attenuating light, reducing light scattering and spectral diffraction, and providing stable performance through the use of thin-plate filters and gradation coating.
Implementation Method 1
the light shielding plate is configured such that white-light transmittance decreases in a stepwise manner in the direction away from the sawtooth-shaped ends
Implementation Method 2
a condenser lens which includes a group of lenses arranged in a grid pattern, and which allows light emitted from a light source lamp to be incident thereon and emits the light, as a uniform light beam, to the outside
Implementation Method 3
a polarization beam splitter which allows the uniform light beam emitted from the condenser lens to be incident thereon and reflects the uniform light beam
Implementation Method 4
an image generation unit which receives the image signal to convert the image signal to image light, and which allows the uniform light beam reflected by the polarization beam splitter to be incident thereon so as to optically modulate, through the image light, the uniform light beam
Implementation Method 5
a projection lens which allows the high-brightness image light transmitted through the polarization beam splitter to be incident thereon and projects the high-brightness image light, as projection light, onto the screen
Implementation Method 6
When the above-described light having been imparted with various transient characteristics is incident thereon, light scattering and spectral diffraction will occur at such large number of edges
Implementation Method 7
light scattering and spectral diffraction will occur at such large number of edges
Data Source
AI summary
In a multi-projection device, each of the projectors comprises a light shielding plate. The light shielding plate has an end formed into a sawtooth shape and is also provided with a gradation coated part which is coated such that white-light transmittance gradually decreases in the direction away from the end.