Projection Screen Triangular Pyramid Microstructure Brightness Uniformity
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Solution Overview
Problem
Existing projection screens struggle to achieve both high gain and brightness uniformity due to limitations in their optical structure, leading to poor viewing experiences, especially in larger images and farther viewing positions.
Innovation Solution
A projection screen featuring a microstructure layer with triangular pyramid units arranged in an array, where the taper angles of these units vary gradually to converge image light around the viewer's position, reducing brightness differences and enhancing both gain and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If scattering particles are added to a reflective layer of a wire grid microstructure to improve brightness uniformity, then brightness uniformity is improved, but reflectivity of the reflective layer decreases and gain of the projection screen reduces
Solution Approach 1:
The patent changes the geometric parameters of the microstructure (transitioning from wire grid to triangular pyramid shape with specific taper angles) to optimize both brightness uniformity and reflectivity simultaneously, rather than adding scattering particles that compromise reflectivity
Solution Approach 2:
The patent applies different taper angles to triangular pyramid units at different positions (varying gradually in the vertical direction) to create localized optical properties that achieve both high reflectivity and improved brightness uniformity across the screen surface
2Ease of manufacture
If a wire grid microstructure is used to create a projection screen, then the screen can be manufactured, but brightness uniformity is poor due to optical structure limitations
Solution Approach 1:
The patent divides the screen into an array of discrete triangular pyramid units with specific taper angles, where each unit is optimized for its position to achieve overall brightness uniformity while maintaining manufacturability through standardized geometric forms
Solution Approach 2:
The patent optimizes the taper angle parameter of triangular pyramid units to satisfy specific optical relationships (where θ denotes the taper angle, α1 denotes an incident angle of image light, α4 denotes an emergent angle of the image light, and n denotes a refractive index), achieving superior brightness uniformity compared to conventional wire grid structures
3Ease of manufacture
If the projection screen uses conventional optical structures, then manufacturing is feasible, but gain is reduced due to poor scattering characteristics
Solution Approach 1:
The patent optimizes the geometric parameters of triangular pyramid units (including taper angles that satisfy specific optical relationships) to enhance light scattering characteristics and achieve high gain (4.9) while maintaining manufacturing feasibility
Solution Approach 2:
The patent creates a composite microstructure combining triangular pyramid geometric forms with specific optical properties, achieving both high gain and brightness uniformity through the synergistic effect of the structured geometry
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 ensures high brightness uniformity and high gain, maintaining brightness uniformity at 80% or above while achieving a gain of 4.9, significantly improving the viewing experience compared to existing technologies.
Implementation Method 1
Each of the taper angles forms an angle between a base of one of the at least two triangular pyramid units that has the taper angle and an edge, parallel to the vertical direction, of the triangular pyramid unit. Each of the taper angles of the at least two triangular pyramid units arranged along the second direction satisfy: where θ denotes the taper angle of one of the at least two triangular pyramid units, α1 denotes an incident angle of image light, α4 denotes an emergent angle of the image light, and n denotes a refractive index of the triangular pyramid unit.
Implementation Method 2
a projector projects image light onto a screen (known as a projection screen), the image light is scattered on the screen, and part of the scattered image light is received by human eyes
Data Source
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AI summary
Provided is a projection screen (10), the taper angles of a plurality of triangular pyramid units (11) arranged in an array are designed to gradually change according to a predetermined relationship, so that the image light emitted from the projector is reflected by a microstructure layer with a triangular pyramid unit (11) and then converges to a range centered on the human eye, which reduces the difference in brightness at different viewing positions, so as to ensure that the projection screen (10) has high brightness uniformity and high gain.