JP2951642B2 - Projector screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector screen used as an image display medium, and more particularly to a projector screen having an improved viewing angle and brightness.

[0002]

2. Description of the Related Art An image projection system such as a projection television or a video projector is a small cathode ray tube.
An image is formed using an image display device such as a liquid crystal display (CRT), liquid crystal display (LCD), or polymer dispersed liquid crystal display panel (PDLC), and the image is enlarged and projected on a large screen by a projection lens. Recently, the demand for such a video projection system has been increasing every day because of the advantage that a large screen that can satisfy the demands of consumers can be obtained. When there are a large number of viewers, the video projection system should have a large viewing angle, and uniform brightness is required over a large screen.

Referring to FIG. 1 showing a conventional projector screen, light emitted from an image source is magnified and projected by a projection lens (not shown), and then is subjected to a Fresnel lens.
11 changes to parallel light. A lenticular lens 12 for diffusing parallel light passing through the Fresnel lens 11 to form an image is disposed in front of the Fresnel lens 11.

[0006] A screen protection panel 13 made of acrylic or the like is provided in front of the lenticular lens 12, that is, on the viewer side. The lenticular lens 12
Is composed of a plurality of unit lenses 12 'as shown in FIG. 2, and a projecting portion 12a for absorbing a part of the light reflected from the lens convex portion 12c is provided at the boundary between the unit lenses 12'. A black stripe 12b coated with black ink or the like is formed at an end of the protruding portion 12a and extends toward the screen protection panel 13, so that the contrast of an image can be improved.

Since the height of the projection 12a on which the black stripe 12b of the conventional projector screen is formed is higher than the projection 12c of the lenticular lens 12, the diffusion angle of light is limited by the lenticular lens 12. There is a problem that a horizontal viewing angle at which an image can be observed on a screen is limited.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a projector screen having an improved horizontal viewing angle and brightness.

[0007]

In order to achieve the above object, a projector screen according to the present invention comprises: a Fresnel lens for converting incident light passing through a projection lens of a light projection device into parallel light; A lenticular lens for diffusing parallel light, and the lenticular
And a protective panel integrally formed with the lens .

[0008] The lenticular lens is formed by connecting a columnar lens group in which a plurality of unit lenses are vertically stacked in a state of being arranged in parallel with the protective panel. Preferably, the lenticular lens includes a light diffusing material. A light diffusing surface by a hologram laser is formed on the surface of the lenticular lens.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Referring to FIG. 3, a projector screen according to an embodiment of the present invention includes a Fresnel lens 21 for converting light expanded by a projection lens of a projection device into parallel light after being emitted from an image source (not shown), and Installed in front of the Fresnel lens 21, the Fresnel lens
A lenticular lens 22 of light diffusion means for diffusing parallel light emitted from 21 to form an image, and a protection panel 23 made of, for example, acrylic, which is formed integrally with the lenticular lens 22 to protect the lenticular lens 22. including.

As shown in FIG. 4, the lenticular lens 22 has a plurality of unit lenses 22L vertically stacked to form a columnar lens group 22G, and the plurality of lens groups 22G are parallel to the surface of the protection panel 23. Are connected in a state of being arranged. A light diffusing surface 22D is formed on the surface of the unit lens 22L by a laser hologram technique, and a light diffusing material D is added inside. The entire surface of the protection panel 23 is subjected to a surface treatment to prevent external light reflection.

In the projector screen,
The light enlarged and projected by the projection lens (not shown) of the projection device becomes parallel light by the Fresnel lens 21. Next, the light incident on the lenticular lens 22 spreads at a relatively large angle due to the connection between the unit lenses 22L, the light diffusion surface 22D and the light diffusion material D.

[0012]

As described above, the projector screen according to the present invention has a wider light diffusion angle range, so that the horizontal and vertical viewing angles are wider than those of the conventional screen, and external light is reflected by the light diffusion surface of the protection panel. Therefore, the brightness is improved. Further, since it is not necessary to form a black stripe on the lenticular lens, the cost is reduced and the productivity is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a configuration of a conventional projector screen.

FIG. 2 is a partial sectional view taken along the line II-II in FIG.

FIG. 3 is a schematic perspective view showing a configuration of a projector screen according to the present invention.

FIG. 4 is a partially enlarged perspective view of FIG. 3;

[Explanation of symbols]

 21 Fresnel lens 22 Lenticular lens 23 Protective panel 22L Multiple unit lenses 22G Columnar lens group 22D Light diffusing surface

──────────────────────────────────────────────────続 き Continued from the front page (56) References JP-A-2-77737 (JP, A) JP-A 1-176831 (JP, U) JP-A 63-54138 (JP, U) JP-A 63-54138 45548 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) G03B 21/62

Claims (4)

(57) [Claims] 1. A Fresnel lens for converting incident light passing through a projection lens of a light projection device into parallel light, a lenticular lens for diffusing parallel light passing through the Fresnel lens, and a lenticular lens formed integrally with the lenticular lens . and a protective panel in containing Mpu Roger compactors screen, the lenticular lens is a plurality of unit lenses are vertically
Stacked columnar lens groups are arranged parallel to the protective panel
Formed by being joined in the
Projector screen 2. The projector screen according to claim 1 , wherein the lenticular lens includes a light diffusing material. 3. A projection screen according to claim 1, wherein a plurality of minute irregularities on the surface formed Ri by the hologram laser of the lenticular lens is formed into a light diffusing surface. 4. The projector screen according to claim 1 , wherein the entire surface of the protection panel is treated to prevent external light reflection.