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Screens and projection systems

A technology for screens and projectors, applied in the field of projection display, can solve the problems of decreased brightness uniformity of projected images, low throw ratio of short-focus projectors, and effects on screen contrast, and achieves the goal of reducing reflectivity, improving contrast, and reducing effects. Effect

Active Publication Date: 2021-08-24
APPOTRONICS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Due to the low throw ratio of the short focal length projector, the angle of incidence of the light emitted from the projector to different positions of the projection screen is different. The Fresnel reflection on the screen surface is positively related to the angle of incidence. The larger the angle of incidence, the higher the angle of incidence. The higher the Fresnel reflection, due to the uneven Fresnel reflection on the surface, the brightness of the center area of ​​the screen surface is higher, while the brightness of the edge area is lower, and the brightness difference between the center area brightness and the edge area is relatively large, even as high as 20%. The above will reduce the brightness uniformity of the projection screen, and the ambient light from the top or side of the screen will also affect the contrast of the screen. Therefore, the existing screen needs to be improved.

Method used

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  • Screens and projection systems
  • Screens and projection systems
  • Screens and projection systems

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Experimental program
Comparison scheme
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no. 1 approach

[0040] see figure 1 , figure 1 It is a schematic structural diagram of the projection system according to the first embodiment of the present invention. The projection system 100 may include a screen 110 and a short-focus projector 120 , and the screen 110 may be used for front projection of the short-focus projector 120 .

[0041] like figure 1 As shown, the screen 110 may include a surface diffusion layer 11 , a light absorption layer 12 and a reflection layer 13 . The surface diffusion layer 11 is attached to one side of the light-absorbing layer 12, and the other side of the light-absorbing layer 12 is attached to one side of the reflective layer 13. The light emitted by the projector 120 centered on the light-emitting surface is incident on the light-emitting surface. The surface diffusion layer 11, most of the light refracted by the surface diffusion layer 11 passes through the light absorbing layer 12 and is reflected by the reflective layer 13, and the reflected lig...

no. 2 approach

[0058] see Figure 9 , Figure 9 It is an enlarged cross-sectional view of the light absorbing layer of the second embodiment. The difference between this embodiment and the first embodiment is that: the light absorbing layer 22 further includes a light absorbing base layer 223 . It should be noted that within the scope of the spirit or basic features of the present invention, the specific solutions applicable to the first embodiment can also be correspondingly applicable to the second embodiment. In order to save space and avoid repetition, here I won't go into details.

[0059] The light-absorbing strip 222 is preferably made of a semi-light-absorbing translucent material, and the light-absorbing base layer 223 is made of a semi-light-absorbing translucent material. The light-absorbing strip 222 and the light-absorbing base layer 223 can be directly formed by hot pressing or UV curing. It is integrally formed on the transparent base layer 221, and the surface of the light...

no. 3 approach

[0062] The difference between this embodiment and the first embodiment and the second embodiment is that: the light absorbing layer 32 further includes a transparent layer 324 . It should be noted that, within the scope of the spirit or basic features of the present invention, the specific solutions applicable to the first embodiment and / or the second embodiment can also be correspondingly applicable to the second embodiment, in order to save space In order to avoid repetition, it will not be repeated here.

[0063] see Figure 10 , Figure 10 It is an enlarged cross-sectional view of two structures of the light absorbing layer 32 of the third embodiment. The transparent layer 324 covers the transparent base layer 321 or the light-absorbing base layer 323 to fix the light-absorbing strips 322 in the transparent layer 324, so that the light-absorbing layer 32 generally forms a film-like light-absorbing layer with uniform thickness, which is convenient for the light-absorbing ...

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Abstract

The present invention provides a screen, which includes a light-absorbing layer and a reflective layer, the light-absorbing layer includes several light-absorbing strips, and the several light-absorbing strips are radially distributed, and at least part of the light emitted by the projector can pass through the gaps between the several light-absorbing strips and reflected by the reflective layer. The invention also provides a projection system. The invention can reduce the influence of ambient light and improve the brightness uniformity of the screen.

Description

technical field [0001] The invention relates to the technical field of projection display, in particular to a screen and a projection system. Background technique [0002] Due to the low throw ratio of the short focal length projector, the angle of incidence of the light emitted from the projector to different positions of the projection screen is different. The Fresnel reflection on the screen surface is positively related to the angle of incidence. The larger the angle of incidence, the higher the angle of incidence. The higher the Fresnel reflection, due to the uneven Fresnel reflection on the surface, the brightness of the center area of ​​the screen surface is higher, while the brightness of the edge area is lower, and the brightness difference between the center area brightness and the edge area is relatively large, even as high as 20%. The above will reduce the brightness uniformity of the projection screen, and the ambient light from the top or side of the screen wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/60G03B21/62
CPCG03B21/60G03B21/62
Inventor 胡飞王霖李屹
Owner APPOTRONICS CORP LTD