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Video display apparatus and method of preventing inadvertent switch-off of light source therein

A technology for video display and power-off, which is applied to projection devices, identification devices, TVs, etc., and can solve problems such as inconvenient use

Inactive Publication Date: 2004-03-24
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This brings great inconvenience to the use

Method used

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  • Video display apparatus and method of preventing inadvertent switch-off of light source therein
  • Video display apparatus and method of preventing inadvertent switch-off of light source therein
  • Video display apparatus and method of preventing inadvertent switch-off of light source therein

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Embodiment Construction

[0020] The preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] The following examples are preferred examples of the present invention, but the scope of the present invention is not limited thereto.

[0022] figure 1 is a perspective view of an embodiment of the video display device of the present invention. This figure shows a rear projection projector called a liquid crystal rear projection television receiver.

[0023] The rear projection projector 1 has an upper cabinet 2 and a lower cabinet 3 . In the upper case 2, a rectangular frame 4 forms its front, and a screen 5 is mounted on the frame 4. As shown in FIG.

[0024] The upper box body 2 is made into a box, has an upper wall 6, side walls 7, 8, a rear wall 9 and a bottom wall 10, and has a closed inner cavity around it. figure 2 The mirror 11 shown is placed in the upper case 2 . A screen 5 as a display plane is placed in front of th...

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PUM

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Abstract

A video display apparatus comprising a video display device for visually presenting a video image thereon; a light source turned on by discharge and displaying the video image, which is being presented visually on the video display device, on a screen by irradiation of light; and a system controller for putting out the light source after a lapse of a predetermined delay time from input of a command to switch off a power source. There is also provided a method of preventing inadvertent switch-off of the light source in such a video display apparatus. Even if the power source is switched off inadvertently, the light source is not put out at once and the video image can still be displayed continuously thereon by switching on a power key immediately within the predetermined delay time.

Description

technical field [0001] The present invention relates to improvements in video display devices, such as television receivers, monitors or video projectors, and to methods of preventing inadvertent switching off of light sources in video display devices. Background technique [0002] In the category of video display devices (also referred to as video projection devices), the above-mentioned television receivers, video monitors, and video projectors are included. [0003] In any of the video display devices described above, a video image is visually presented on a video display unit such as a liquid crystal display unit, and then the video image is enlarged and displayed on a screen by projecting the liquid crystal display unit from behind with an external light source. [0004] For example, a liquid crystal rear projection television receiver using a liquid crystal display unit is suitable for obtaining a wider screen while reducing its thickness, so it can be easily Realize ...

Claims

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Application Information

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IPC IPC(8): G03B21/14G09F9/00H04N5/63H04N5/74
CPCH04N5/74H04N5/63
Inventor 袴田邦夫杉山治久保寺玄一郎二木晴菜长谷川伸夫代田竜一大野茂树
Owner SONY CORP