Polycarbonate-substrate hard back-projection screen for edge blending

A technology of polycarbonate and edge fusion, applied in projection devices, instruments, optics, etc., can solve problems such as the inability to use the rear projection screen, the inability to ensure the normal operation of the fusion belt, and the insufficient light diffusion ability of the light diffusing agent. The effect of simple processing technology, good gain and easy installation

Inactive Publication Date: 2012-10-03
李澄 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polycarbonate (PC) rear projection hard screen does not have sufficient light diffusion ability due to the selection and formulation of the light diffusing agent, and the half-gain viewing angle of the product is only 15-25 degrees. There is a strong hotspot (sun effect), when multiple projectors are working in edge blending, the blending strips are not guaranteed to work, not for rear projection screens with edge blending

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Using aromatic polycarbonate, light diffusing agent particles and transparent black masterbatch as raw materials, it is processed by plastic extrusion technology, and its characteristics are: the surface roughness of the roll used is 10μm~100μm, and the light diffusion factor FD≥0.95, The larger the value of the diffusion factor FD, the stronger the diffusion ability, and the more suitable for high-lumen short-focus projectors to project seamless super-large images in a fusion manner, that is, the half-gain viewing angle of the screen can only be used for edge fusion when it reaches 55 degrees or more. .

[0014] The FD=(no-n)*Dp*h / d, where:

[0015] no-n: The difference between the optical refractive index no of the light diffusing agent and the optical refractive index n of the aromatic polycarbonate is ±0.03~±0.09, and is calculated by absolute value in the formula;

[0016] Dp: mass percentage of light diffusing agent, 1.5~3.5%;

[0017] h: screen thickness, 1.0~3...

Embodiment 2

[0025] Raw material is with embodiment 1.

[0026] The mass percentage of each component is as follows: 94.5% aromatic polycarbonate, 3.5% light diffusing agent, 2% transparent black color masterbatch, the difference between the light refractive index of light diffusing agent and the light refractive index of aromatic polycarbonate The difference is 0.09.

[0027] The production method is the same as in Example 1, and the thickness of the product produced by the extrusion process is 1.0 mm, and the width of the plate is 2.3 m.

[0028] Calculated according to the formula FD=(no-n)*Dp*h / d, the diffusion factor FD is 1.05. After testing: the gain of the obtained product is 0.70, and the half-gain viewing angle (diffusion angle) is 60 degrees. This screen is suitable for brightness between 2500- Projectors between 4000 lumens work in fusion.

Embodiment 3

[0030] Raw material is with embodiment 1.

[0031] The mass percentage of each component is as follows: aromatic polycarbonate 96.0%, light diffusing agent 2.6%, transparent black masterbatch 1.4%.

[0032] The production method is the same as in Example 1, and the product produced by the extrusion process has a thickness of 2.1 mm and a plate width of 2.3 m.

[0033] Calculated according to the formula FD=(no-n)*Dp*h / d, the diffusion factor FD is 1.638. After testing: the gain of the obtained product is 0.55, and the half-gain viewing angle (diffusion angle) is 70 degrees. This screen is suitable for brightness between 6500~ Projectors between 9000 lumens work in fusion.

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Abstract

The invention discloses a polycarbonate-substrate hard back-projection screen for edge blending. The polycarbonate-substrate hard back-projection screen for edge blending is formed by processing raw materials of aromatic polycarbonate, light diffusant particles and transparent black masterbatch by means of the plastic extrusion process. The surface roughness of a roller utilized ranges from 10 micrometers to 100 micrometers, light diffusion factor FD is larger than or equal to 0.95. Compared with the prior art, the polycarbonate-substrate hard back-projection screen for edge blending has the advantages of simplicity in processing technique, convenience to transport, easiness to mount and the like, and more importantly, the light diffusant with +/-0.03 to +/-0.09 difference between the light refractive index and the substrate (aromatic polycarbonate) is utilized and usage thereof is determined, so that the optimum gain and a larger diffusion angle are achieved, and multiple projectors can work in edge blending manner and form a full-screen image without seams.

Description

technical field [0001] The invention relates to a rear projection screen, especially a polycarbonate-based screen with simple processing technology, convenient transportation, and easy installation, which has the best gain and diffusion angle and can meet the requirements of multiple projectors working in an edge fusion manner. The edge of the substrate is blended with a rear projection hard screen. Background technique [0002] Because the rear projection (rear projection) has the advantages of strong resistance to ambient light, bright colors, and high contrast, it has been widely used in various high-end occasions such as command and dispatch centers, video conference rooms, and exhibition halls. According to the working principle, the rear projection screen is divided into two types: optical screen and scattering screen: the optical screen adopts the working principle of Fresnel lens, which contains one or more optical lens systems inside the screen. The direction of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L33/12C08L25/04C08K3/36C08J3/22G03B21/56
Inventor 李澄赵童李黎
Owner 李澄
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