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.
- Application Information
AI Technical Summary
Problems solved by technology
no. 1 example
 In this embodiment, a curved reflection surface 4a is provided.
 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.
 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.
 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
 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.
 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.
 Since the spherical reflection screen 4b having a regular curvature according to the present emb...
no. 3 example
 In this embodiment, a Fresnel reflection screen 4C is provided.
 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.
 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.
 like Figure 9 As shown, the Fresnel reflection screen 4C has the reflection surface ...
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