JPS6031387A - Projective type television device - Google Patents

Abstract

PURPOSE:To make remarkably a display screen bright in comparison with a conventional device by displaying a chrominance component picture light corresponding to the three primary colors by means of three cathode ray tubes, irradiating the chrominance component picture light to the corresponding color light emitting part of a fluorescent film consitituting a screen via a hole provided to a light shield plate from different positions and emitting light to display the color picture. CONSTITUTION:When a picture corresponding to a red component in the three primary colors is displayed to a cathode ray tube 2, this picture is projected onto a screen 1 by an optical system 5 and only the red component picture light R through the hole 12 provided to the light shield plate 11 is irradiated to the fluorescent film 10R as shown in arrows R1, R2 and the fluorescent film 10R receives stimulation and emits strongly the red light. Similarly, the green component picture light G and the blue component picture light B fed from the cathode ray tubes 3, 4 are irradiated selectively to the corresponding fluorescent films 10G, 10B via the holes 12 provided to the light shield plate 11, the fluorescent films 10G, 10B are stimulated and the green and blue colors are light emitted strongly. The luminescence of the fluoresent films 10R, 10G and 10B light emitted in this way is scattered at a scattering layer 9 and irradiated to a viewer via a transparent base plate 8.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a projection television apparatus that displays an enlarged screen on a screen.

Background Technology In recent years, with the development of information transmission using five images, there has been a strong desire for large-screen displays, and in response to this, projection television devices have been developed.

This projection television device uses three cathode ray tubes to display three types of primary color images, and uses an optical system to magnify and irradiate each primary color image onto the screen.
The primary color images are combined on a screen to obtain an enlarged color image.

However, since the projection television device with the above configuration synthesizes three primary color images by simply magnifying and irradiating the screen onto the screen, the brightness of one display screen is equal to the magnification value plus shade + f! This is determined by the brightness of the screen displayed on the wire tube, and the displayed image on the screen is generally very dark. For this reason, the above-mentioned conventional O projection television has a problem in that the indoor lighting must be dimmed for viewing.

DISCLOSURE OF THE INVENTION Therefore 5 objects according to the present invention are bright lli! An object of the present invention is to provide a projection television device capable of obtaining an i7 screen.

In order to achieve such an object, the projection television apparatus according to the present invention uses three cathode ray tubes to display images of three primary color components, and uses an optical system to display the input screen of each of the cathode ray tubes. The screen is composed of a light-emitting layer provided on the surface of a transparent substrate and a light-shielding plate provided at a predetermined distance from the light-emitting layer. The light-emitting layer has a number of holes that selectively irradiate each primary color component image light projected from different directions onto the light-emitting layer so as not to interfere with each other, and the light-emitting layer irradiates the primary color component image light at the irradiation position of each primary color component image light. Each of them is provided with a fluorescing film that emits light, and a bright screen displayed by the re-emission of the phosphor film by the projected image light can be viewed through a transparent substrate.

The projection type television device configured in this way selectively causes three types of phosphor films provided on the screen to emit light using the projection light of three types of primary color component images. It has an excellent effect of providing a much brighter enlarged projection screen.

BEST MODE FOR CARRYING OUT THE INVENTION FIG. 1 is a side view of essential parts of an embodiment of a projection television apparatus according to the present invention. In the figure, 1 is a screen, and 2 to 4 are cathode ray tubes for displaying red, green, and blue color component images, which are arranged in parallel in the horizontal direction. 5,
6.7 is an optical system that projects each color component image displayed on the polar ray tubes 2 to 4 onto the screen 1, and the incident angle of each color component image light projected onto the screen 1 is different. Become.

FIG. 2 is an enlarged cross-sectional view of the main part of the screen 1 shown in FIG. becomes the viewing surface of the projected image. Reference numeral 9 denotes a light scattering layer uniformly applied over the entire back surface of the substrate 8, which improves color mixing and expands the viewing range. 10 is a light-emitting layer coated on the surface of the light-diffusing layer 9, and includes a fluorescent film 10R, IOG, which emits red, green, and blue, which constitute the three source colors of light;
It is constructed by sequentially applying IOB in stripes in ffff1 and D pattern. Reference numeral 11 denotes a light shielding plate that is disposed opposite to the light emitting layer 10 at a predetermined distance. The light-shielding plate 11 is provided with 10 phosphor films, LOG, A large number of holes 12 are provided for dividing and supplying the IOB.

In FIG. 2, R, G, and B indicate projected image lights corresponding to red, green, and blue supplied from each of the cathode ray tubes 2 to 4 via the optical system.

In the projection television device configured in this way,
When an image corresponding to the red component of the three primary colors is displayed on the cathode ray tube 2, this image is displayed on the screen l by the optical system 5.
is projected on. In this case, since the light shielding plate 11 is provided on the front side of the light emitting layer 10 in the screen l,
As shown in FIG. 2, only a portion of the red component image light passing through the hole 12 provided in the light shielding plate 11 is shown by the arrows R, l,
The fluorescent film 10R is irradiated as shown by R1. As a result,
The fluorescent film 10R is stimulated by the irradiation of the red component image light R1 to emit strong light, and the color of the emitted light is red. Similarly, the green component image light G and blue component image 9B supplied from the cathode fatty tube 3°4 are also selectively irradiated onto the corresponding phosphor films LOG and IOB through holes 12 provided in the light shielding plate 11. As a result, the fluorophores 10G and 10B are stimulated and emit strong green and back-colored light. The light emitted from the phosphor films 10R, IOG, and IOB emitted in this way is transmitted to the light scattering layer 9.
By being scattered, the three primary color lights are mixed and the viewing range is expanded, and then the light is emitted to the viewer via the transparent substrate 8.

Therefore, from each cathode ray tube 2 to 4, the phosphor film 10R, IQG,
By generating each component image light composed of light that strongly stimulates the IOB and causes it to emit bright light (a wide range of visible light may be acceptable, such as infrared and ultraviolet light), a projected image with an extremely bright color display can be obtained. become.

In the above example, 10 liters of fluorescent film, IQ()
, a case has been described in which IOB is sequentially and repeatedly applied in a stripe pattern, but as shown in FIG. .

LOG and IOB may also be provided, and in this case, the mixture of emitted light colors becomes better, resulting in improved image quality. In order to increase the contrast of the displayed image, it is also possible to surround each fluorescent film with a light-absorbing substance such as carzene.
Alternatively, the ornamental surface side of the substrate 1 may be configured to absorb some light so as to absorb external light.

As explained above, in the projection television apparatus according to the present invention, color component image lights corresponding to the three primary colors are displayed using three cathode ray tubes, and the color component image lights are transmitted from different positions to the light shielding plate. A 2-color image is displayed by irradiating the light-emitting portion of the corresponding color of the phosphor film that makes up the screen through the hole provided in the screen, causing the screen to emit light, and this color image can be viewed directly. , it is possible to make the display screen much brighter than before.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a main part showing an embodiment of a projection television apparatus according to the present invention, FIG. 2 is an enlarged sectional view of a main part of the screen shown in FIG. 1, and FIG. 3 shows another embodiment. It is a sectional view of the main part. 1...Screen, 2-4...Cathode ray tube, 5-7.
...Optical system, 8...Substrate, 9...Diffusing layer, 10...
・Light emitting layer, IOR, IOG, IOB... fluorescent film, 11
... Light shielding plate, 12... holes.

Claims (1)

[Claims] (1) A screen that displays a projected image, three cathode ray tubes that are arranged in parallel at a predetermined distance from each other and that display color component images corresponding to the three primary colors, and an image that is displayed on each cathode ray tube. an optical system for projecting onto the screen, the screen having a light-emitting layer coated on a light-transmitting substrate, and a light-shielding plate disposed facing the light-emitting layer at a predetermined distance from the light-shielding plate; The plate is provided with a number of holes through which each color component image light supplied from each of the cathode ray tubes via an optical system is irradiated onto the light emitting layer so as not to overlap with each other. The part that is irradiated with the color component image light of M2 is constituted by a fluorescent film that emits the first primary color light, and the part that is irradiated with the color component image light of M2 is constituted by a fluorescent film that emits the second primary color light. 1. A projection television apparatus comprising: a portion irradiated with third color component image light comprising a fluorescent film that emits third primary color light;