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Screen for rear projection display

A display and screen technology, applied in optics, instruments, projection devices, etc., can solve problems such as easy generation of stray light, degradation of image quality, and complex structure.

Inactive Publication Date: 2005-11-30
TOHOKU TECHNO BRAINS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned existing screens have problems such as stray light is easily generated due to the complex structure, and ripples are generated due to the periodic structure of the lens, which leads to a decrease in image quality.

Method used

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  • Screen for rear projection display
  • Screen for rear projection display
  • Screen for rear projection display

Examples

Experimental program
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Embodiment

[0024] Figure 5 It is a schematic diagram showing a design example of a rear projection display using the screen of the present invention. In this example, only the vertical direction is considered, and it is constituted on a screen composed of a scattering film 2 with a longitudinal size of 100 cm and a thickness of 0.3 mm having a scattering area of ​​±60° (from -60° to +60°). The extended angle of 24° casts the projection light. In this case, by using two plane mirrors 4A, 4B and arranging them and the projector 1 on the rear side of the screen in a positional relationship as shown in the figure, a display with a depth of about 45 cm can be produced.

[0025] According to the present invention, it is possible to obtain a rear projection display screen with a simple structure and without generating stray light and ripples, which can have an excellent effect of improving the display image quality of the rear projection display.

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Abstract

A screen for rear projection display having a simple structure capable of displaying a high quality image without generating a stray light or moire. The display comprises a film (2) for scattering an incident light from a specified angular region (between -alpha and -beta) uniformly in a specified angular region (between alpha and beta), characterized in that a view angle of 40 DEG or above in one or both of the vertical direction and the horizontal direction is provided. A protective plate (3) may be superposed on the scattering film, as required.

Description

technical field [0001] The invention relates to a screen for rear projection display. Background technique [0002] The so-called rear projection display refers to a display method in which an image projected by a projector to the rear side of a transmissive screen is viewed from the front side of the screen. In the prior art, generally, the screen used in the rear projection display such as Image 6 As shown, a Fresnel lens 10 for making diffused light from a projector 1 into parallel light, a cylindrical lens 20 for scattering the parallel light, and a protective plate 3 for protecting the lens are included. At this time, the angle of light scattering needs to be greater than or equal to 40° in the vertical direction and the horizontal direction (refer to for example the document "SID 01 DIGEST 934P-95: Fresnel Lensesin Rear Projection Displays, Arthur Davis, Robert C. Bush, John C. Harvey, and Michael F. Foley", document "SID 02 DIGEST 134251.3: Invit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
CPCG03B21/62G03B21/56
Inventor 内田龙男片桐麦宫下哲哉石锅隆宏
Owner TOHOKU TECHNO BRAINS