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Projection display system

A projection and projector technology, applied in the field of projection display systems and display screens, can solve the problems of reduced contrast and reduced image contrast.

Inactive Publication Date: 2005-08-10
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reflection of ambient light towards the viewer can cause a reduction in image contrast, especially in areas that receive fairly high levels of ambient light
However, this reduction in contrast is usually undesirable

Method used

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Examples

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Embodiment Construction

[0015] Figure 1 is a cutaway side view illustrating an exemplary projection system 10 in accordance with the principles of the present invention. Projection system 10 includes a projector 12 and a projection screen 14 . Projection screen 14 includes a diffusely reflective polarizer 16 capable of diffusely reflecting light polarized in a first direction and transmitting light polarized in a second direction. The first and second directions of polarization may be perpendicular to each other, although the invention is not necessarily limited in this respect.

[0016] Projection screen 14 also includes a second polarizer 18 adjacent to the rear side of diffuse reflective polarizer 16 . The orientation of polarizer 18 relative to diffuse reflective polarizer 16 is such that polarizer 18 transmits light polarized in the second direction. In other words, diffuse reflective polarizer 16 and second polarizer 18 are aligned such that both polarizers transmit light polarized in the sec...

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PUM

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Abstract

In one embodiment, a projection screen includes a diffuse reflecting polarizer that diffusively reflects light polarized in a first direction and transmits light polarized in a second direction. The projection screen may also include a second polarizer adjacent a back side of the diffuse reflecting polarizer, wherein the second polarizer is oriented to transmit light polarized in the second direction. The projection screen may appear substantially diffuse when viewed from a front side and substantially transparent when viewed from a back side.

Description

technical field [0001] The present invention relates to projection display systems and display screens suitable for LCD projectors. Background technique [0002] Projection display systems typically include a projector and a projection display screen. The projector may be a three-color liquid crystal display projector that combines polarized light from different liquid crystal displays and emits the combined light to form an image. A projector can project images on a display screen for presentation to an audience. The display screen can provide a diffuse surface to enhance the image quality seen by the viewer. [0003] Projectors that emit polarized light are most efficient when the direction of polarization can change with the different colors of light combined. For example, light polarized in one direction is most effective for reflection, while light polarized in the other direction is most effective for transmission. Therefore, the light output by a projector can con...

Claims

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Application Information

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IPC IPC(8): G02F1/13G03B21/00G03B21/60
CPCG03B21/604G03B21/60H04N5/74
Inventor 马家颖D·J·W·奥斯图恩A·B·马哈穆迪
Owner 3M INNOVATIVE PROPERTIES CO