JPH0277735A - Rear projection screen - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission screen for a rear projection display, and particularly to a rear projection screen suitable for a large screen display.

[Conventional technology]

Transparent back tIT used in rear projection displays
The J projection screen is manufactured by extrusion molding or hot press molding using a mold to form a lenticular shape in order to widen the angle. However, with this manufacturing method, the size of the mold is limited to about 1.5 m, so when making a large screen, it is necessary to join several screens together. The conventional large screen is JP-A-58-1?
As in No. 58042, a patch plate was glued to maintain the strength of the seam, and a colored tape was pasted to make the seam invisible.

[Problem to be solved by the invention]

The above-mentioned prior art focuses on reinforcing the strength of the joints of the rear projection screen and hiding the joints, but does not focus on eliminating the seams themselves.

An object of the present invention is to provide a large, seamless rear projection screen.

[Means to solve the problem]

The above purpose is to arrange long fibrous lenses in the vertical and horizontal directions and knit them together, in the same way that warp and weft threads are used instead of using a mold to form the unevenness that makes up the lenticular structure of the rear projection screen. This achieves a seamless rear projection screen even on a large screen.

[Effect]

Fibrous lenses arranged in the vertical direction act as horizontal lenticular lenses, and fibrous lenses arranged in the horizontal direction act as vertical lenticular lenses (therefore, this vertical lens and horizontal lens constitute a double lenticular lens,
Acts as a rear projection screen.

If a light-absorbing substance, such as black resin, is used in the warp and weft threads that knit the vertical and horizontal lenses, the front surface of the rear projection screen will have a black stripe, which will also improve the contrast.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In Figure 1, 1 is a cylindrical transparent resin lens arranged horizontally, 2 is a cylindrical transparent resin lens arranged vertically, and 6 is a cylindrical lens arranged to absorb light. 4 is the black resin, and 4 is the fibrous material used to knit them together.

Lens 1 acts as a vertical lenticule, lens 2 acts as a horizontal lenticule, and black resin 3 acts as a black stripe.

FIG. 2 shows how the light incident on this rear projection screen is focused. The incident light 5 is incident parallel to the plane of the area A and is first focused vertically by the lens 1, then horizontally by the lens 2,
The area of area B becomes emitted light 6.

Originally, a lenticular lens used in a rear projection screen has a parabolic shape or an elliptical shape, but in the present invention, due to the nature of knitting a cylindrical lens, the cross section of the lens shape is almost a perfect circle.

Therefore, as it is, it will be used as a rear projection screen.
There is a lack of freedom in arbitrarily selecting the R field angle.

Therefore, as shown in FIG. 3, the refractive index side of the outer diameter of the cylindrical lens 7 and the refractive index of the inner diameter? By making L2 different, light is focused using Snell's law.

〔Effect of the invention〕

According to the method of the present invention, there is no size limit like that of a mold, so a large seamless rear projection screen can be realized, and there is no need to hide the seams on a large screen, and a high-quality display can be obtained. It has the effect of

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the invention, and Fig. 2 is a transparent diagram of the details of Fig. 1. J? 3 are explanatory diagrams for explaining in more detail the light condensing method shown in FIG. 2. 1...Cylindrical lens, 2...Cylindrical lens, 5...Cylindrical black resin that absorbs light, 4...1~
Fiber used to knit 3. No. rm 2Fi O-drop lens 3 Black resin

Claims (1)

[Claims] 1. A back surface characterized in that a large screen is constructed by knitting a group of fibrous lenses arranged in parallel in the horizontal direction and a group of fibrous lenses arranged in parallel in the vertical direction using warp and weft threads. Projection screen.