Rear projection display device

A technology of display equipment and rear projection, which is applied in the direction of image reproducer of projection device, TV, color TV, etc., can solve the problems of long distance and large space on the back of the screen.

Inactive Publication Date: 2008-02-06
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the existing rear projection display device, the space occupied by the magnifying projection optical system may be large, especially the distance along the depth direction of the back of the screen may be very long

Method used

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no. 1 approach

[0021] FIG. 1 is a schematic diagram showing the internal structure of a rear projection display device 100 according to a first embodiment to which the present invention is applied. The rear projection display device 100 includes a light source 1 , an optical element 2 , a scanning part 3 , a light guiding screen mirror 4 , and a screen 5 . The optical element 2 has a conical optical element 21 and a beam conversion optical element 22 .

[0022] FIG. 2 shows the system structure of the rear projection display device 100 . When connected to a video signal generator 101, such as a video player, camera, video recorder, broadcast tuner, or Internet, the rear projection display device 100 can receive various video signals. The rear projection display device 100 includes a video signal processor 100A for processing a video signal input by a video signal generator 101, a light source driver 100B for driving the light source 1 according to the video signal, and a scanning driver 100...

no. 2 approach

[0043] FIG. 5 is a schematic diagram showing an internal structure of a rear projection display device 200 according to a second embodiment to which the present invention is applied. The same numerals denote the same components as in the above-mentioned rear projection display device 100, and their detailed descriptions are omitted.

[0044] The rear projection display device 200 has a light guide screen mirror 40 formed such that the curvature in the vertical direction is greater than that in the horizontal direction, and has a concave toric surface with respect to the screen 5 .

[0045] The mutual relationship in position and size of the light guide screen mirror 4 and the screen 5 of the rear projection display device 200 is similar to that shown in FIG. 4B. As shown in FIG. 6 , the shape of the light guide screen mirror 40 is determined in such a manner that the curvature in the vertical direction is greater than that in the horizontal direction, and has a concave toric s...

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Abstract

A rear projection display device that projects an image on a rear side of a screen includes a light source, an optical element, a scanning unit, and a reflecting plate. The light source emits a light beam. The optical element converts the light beam emitted from the light source into a substantially collimated light beam. The scanning unit performs scanning with the substantially collimated lightbeam converted by the optical element so as to allow the substantially collimated light beam to be incident on the screen. The reflecting plate has a height which is at least 1 / 2 of a height of thescreen. The reflecting plate reflects the light beam from the scanning unit so that the light beam is incident on the screen.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Application No. JP2006-206731 filed in Japan Patent Office on Jul. 28, 2006, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a rear projection display device that performs scanning using a light beam to project an image onto the back of a screen. Background technique [0004] After liquid crystal television devices and plasma television devices, rear projection display devices are becoming popular as display devices. Since rear-projection display devices are much less expensive than rear-projection plasma TV devices, such devices are rapidly spreading. [0005] The system adopted by the rear projection display device is changed from the existing cathode ray tube (CRT) system to a system having a microdisplay such as a liquid crystal display (LCD). Rear projection display ...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G03B21/00G03B21/28H04N5/74H04N9/31
CPCH04N9/3141G03B21/28H04N9/3129G03B21/62G02B17/0605G02B27/18
Inventor岩崎正则
OwnerSONY CORP