Bag type presentation apparatus

A display device, box-type technology, applied in projection devices, printing devices, projectors with built-in screens/external screens, etc., can solve the problems of unsatisfactory image display effects, heavy quality, and unfavorable portability.

Inactive Publication Date: 2009-03-04
崔 海龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most conventional screens used with box structures are flat or transmissive and have low brightness, making them unsuitable for bright locations
Further, most conventional projectors have the problem that they are very unfavorable for portability due to their larger size than the case and heavy weight.
PDP and LCD also only have about 300cds / m 2 average brightness, and it is difficult to provide sharp images in bright places, so satisfactory image display effects cannot be achieved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0044] In this embodiment, a curved reflection surface 4a is provided.

[0045] In the case of a conventional flat screen 9, such as Image 6 As shown in a, the bright spot x is caused by the reflective surface defined on the screen surface.

[0046] see Image 6 b, When the horizontal scattering line 10 is formed on the surface of the screen 9 to scatter the light in the horizontal direction, the bright spot x only expands along the horizontal direction.

[0047] In this embodiment, a screen with a vertically curved surface is provided, the screen has horizontal scattering lines 10, and the vertical curved surface has a regular curvature R, such as Image 6 c shown. Furthermore, it is also proposed to position the small projector 7 at the focal position F of a curved reflection screen having a regular curvature R. With this structure, the bright spot x enlarged horizontally by the scattered rays 10 is also enlarged vertically, thereby realizing a screen with uniform brigh...

no. 2 example

[0055] see Figure 7 a and Figure 7 b, A spherical reflective screen 4b with regular curvature is provided. In the present embodiment, the surface reflectance of the spherical reflection screen 4b is 4%-50%, and the curvature R of the spherical reflection screen 4b is determined to be twice the projection distance of the small projector 7 . like Figure 8 As shown, with this structure, by positioning the small projector 7 at the half position R / 2 of the curvature R of the reflection screen 4, the light projected from the small projector 7 to the spherical reflection screen 4b is reflected straightly, as in Figure 8 shown, thereby realizing a bright screen without bright spots x.

[0056] The screen of this embodiment can obtain a brightness of a gain of 4-50 times, that is, 4-50 times of a gain of 1 time of a conventional screen. Here, 1x gain means 1% reflectivity.

[0057] Since the spherical reflection screen 4b having a regular curvature according to the present emb...

no. 3 example

[0059] In this embodiment, a Fresnel reflection screen 4C is provided.

[0060] It is known that the Fresnel film 11 is generally a flat thin film and acts like a refractive lens to refract light projected from its focal position.

[0061] like Figure 9 As shown, the protective panel 5 is provided in the middle area of ​​the box-shaped case 1 between the upper case 2 and the lower case 3, and the Fresnel reflection screen 4C is installed on the front surface of the protective panel. The reflecting mirror 14 and the small projector 7 may be installed in the rear end region of the lower case 3 , or only the small projector 7 may be disposed at the focal position F of the Fresnel reflection screen 4C without the reflecting mirror 14 . In this embodiment, the Fresnel reflection screen 4C may be mounted on the inner surface of the upper case 3, and the upper case 3 is used vertically.

[0062] like Figure 9 As shown, the Fresnel reflection screen 4C has the reflection surface ...

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Abstract

The invention discloses a box type presentation apparatus. The apparatus includes a box-shaped case body having an upper case and a lower case, a curved reflective screen having a focus, and a small projector. The reflective screen is mounted at an inner surface of the upper case and has a reflectance of 4 to 50%. The reflective screen is a curved or spherical reflective screen or a fresnel reflective screen, to straightly reflect a light projected from the small projector located at the focal position thereof, thereby preventing a hot spot and realizing a high screen brightness of 4 to 50 times that of a conventional screen. The projector uses a LED as a light source and has a weight and volume of a fourth that of a conventional projector. The projector is positioned at a focal position of the reflective screen based on the curvature of the reflective screen when in use, and is received in the box-shaped body case when being carried.

Description

technical field [0001] The present invention relates to a video conference apparatus, and more particularly, to a bag type presentation apparatus in which a screen having a curved or spherical reflective surface is installed in a box-type housing to reflect light from a small projector using a diode as a light source The projected light, the small projector is located at the focal position of the screen, whereby the screen can obtain good brightness and sharpness. Background technique [0002] Conventionally, a number of technologies have been developed relating to screens suitable for installation in box-type structures. However, most conventional screens used with box-type structures are flat or transmissive and have low brightness, making them unsuitable for use in bright locations. Further, most conventional projectors have problems in that they are very inconvenient to carry due to their larger size and heavier mass than a box. [0003] Currently, there is an increasi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/00G03B21/56G03B21/60G03B21/20G02F1/13G02F1/13357G03B21/10G03B21/14
CPCG03B29/00G03B21/60
Inventor 崔海龙
Owner 崔 海龙
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