Projection system with forward projection optical screen

A forward projection and projection system technology, which is applied in the field of projection systems, can solve the problems of reduced brightness of projected images, severe brightness loss, reduced display brightness of projected images, etc., and achieves the effects of high contrast, high gain, and high color reproduction

Active Publication Date: 2014-09-24
CHENGDU FSCREEN SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the inherent characteristics of the traceable reflection of the screen microbeads, if the observer 104 deviates too much from the direction of the traceable reflected light 105, the brightness of the projected image will drop sharply
Even if a light diffusion layer 103 is added on the side of the glass bead layer close to the projector to expand the viewing angle of the reflected light of the image, part of the reflected light 106 of the image will be absorbed by the blackened side wall 107 of the grating, which also reduces the The projected image shows brightness, especially at short distance forward projection, where the brightness loss is more severe

Method used

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  • Projection system with forward projection optical screen
  • Projection system with forward projection optical screen
  • Projection system with forward projection optical screen

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Experimental program
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Effect test

Embodiment 1

[0023] The microprism array structure layer 5 of this embodiment has a gradual cross-sectional structure.

[0024] Such as figure 1 As shown, a projection system with a forward projection optical screen consists of a forward projection screen 1 and a projector 2. The forward projection screen 1 includes a base layer 4, a microprism array structure layer 5, and a metal medium The mirror reflective film 8 and the light diffuse reflection layer 9, the micro prism array structure layer 5 is arranged on the side of the base layer 4 facing the projector 2, and the micro prism array structure layer 5 is absorbed by the bottom surface 6, the projector incident light shadow surface 7 and the ambient light The bottom surface 6 is attached to the base layer 4, the shadow surface 7 of the projector's incident light faces the projector 2, the ambient light absorption layer 10 faces away from the projector 2, and the metal dielectric mirror reflective film 8 is set on the projector's incident ...

Embodiment 2

[0029] Such as figure 2 As shown, the cross section of the microprism array structure layer 5 of this embodiment is a ring-belt structure, and the other structural characteristics are the same as in Embodiment 1.

[0030] When the light diffuse reflection layer 9 is a Lambertian reflective surface, the intensity of its reflected light is always proportional to the cosine of the divergence angle. Even if the projector 2 projects image light for a short distance, the Lambertian reflective surface reflects the light. The viewing angle of the image on the side of the observation point 3 is large, and the image brightness uniformity is high. The ambient light absorbing layer 10 has a strong absorption effect. The ambient light R10 and R11 directed to the ambient light absorbing layer 10 are mostly absorbed by the corresponding ambient light absorbing layer 10, so that the plane has a higher contrast in a bright environment. The vertical distance between the projector 2 and the plane ...

Embodiment 3

[0033] Such as image 3 As shown, the cross-section of the microprism array structure layer 5 of this embodiment is a linear array structure, the surface where the ambient light absorbing layer 10 is located is perpendicular to the bottom surface 6, and the other structural characteristics are the same as in Embodiment 1.

[0034] The optical fiber diffuse reflection layer 9 is a Lambertian reflective surface, and the intensity of its reflected light is always proportional to the cosine of the divergence angle. Even if the projector 2 projects image light at a short distance, the Lambertian reflective surface reflects the light, making the observation point The image on the 3 side has a large viewing angle and high image brightness uniformity. The ambient light absorbing layer 10 has a strong absorption effect on ambient light, so that the screen has a high contrast in a bright environment.

[0035] The vertical distance between the projector 2 and the plane of the base layer 4 is ...

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Abstract

The invention relates to a projection system with a forward projection optical screen. The projection system is composed of a forward projection screen (1) and a projection machine (2), the forward projection screen (1) comprises a substrate layer (4), a microprism array structure layer (5), a metal medium mirror surface reflective film (8) and a light diffuse reflection layer (9), the microprism array structure layer (5) is arranged on the side, facing the projection machine (2), of the substrate layer (4), and the microprism array structure layer (5) is composed of a bottom face (6), a projection machine incident ray shadow area (7) and an environment ray absorption layer (10). The projection system has the advantages that under the bright environment, the high gain and high contrast ratio are achieved, meanwhile, no surface glare exists, and the high-color reduction is achieved; a protection layer can be selectively attached to the outer side of the microprism array structure layer, and the protection layer has the advantages of being resistant to scratch, dust and aging.

Description

Technical field [0001] The invention relates to a projection system, in particular to a projection system with a forward projection optical screen. Background technique [0002] In recent years, as the brightness of the projector itself has increased, most projection screens need to be used in natural light or in a very bright environment. Due to technical problems, when using general glass bead screens, white plastic screens, gray screens, etc. to project images, the stronger the ambient light, the brighter the black pattern on the projected image will be, and the contrast of the projected image will be seriously reduced, and the color of the image will be affected by the The ambient light is superimposed and becomes lighter, resulting in unsatisfactory color reproduction. [0003] Therefore, it is very important to use projection screens in bright environments, especially forward projection screens, to solve the color reproduction performance of the projected image, especially t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/60
Inventor 张益民张超
Owner CHENGDU FSCREEN SCI TECH
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