JPS61252787A - Projection type television receiver - Google Patents

Abstract

PURPOSE:To improve brightness and resolution by projecting and overlapping a green color image having a strong influence on the brightness and the resolution of a picture image from two complex color projection tubes, and separately projecting red color and blue color imageshaving small influence from beam index type complex color projecting tube. CONSTITUTION:A complex color projecting tube 11bg of two colors of blue and green and a complex color projecting tube 11rg of two colors of red and green are used. To an image processing circuit 12, a blue and green image output circuit 13bg feeding a video signal of the blue color and the green color to the complex color projecting the 11bg and a red and green image output circuit 13rg outputting a video signal of the red color and the green color to the complex color projecting tube 11rg are connected. The complex color projecting tube 11bg projects the blue color image and the green color image in a beam index system and the complex color projecting tube 11rg projects the red color image and the green color image in a beam index system and the respective primary color images can project brighter images than one including three primary colors. The two complex color projecting tubes 11bg, 11rg overlap and project the green color images.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a projection type television receiver using a two-color blue/green multicolor projection tube and a red/green twocolor multicolor projection tube.

It is possible to project and enlarge the screen size, which is limited by conventional direct-view television receivers, using an optical method. Various types of projection television receivers have been proposed, such as a refractive lens type and a concave mirror reflection type. In the refractive lens system, a three-tube projection television receiver 1 shown in FIG. 2 and a single-tube projection television receiver 2 shown in FIG. 3 are conventionally known.

A three-tube projection television receiver 1 has a configuration in which images are projected onto a screen 3 from monochrome projection tubes 1r, Ig, and lb corresponding to each color of red, green, and blue.
r, Ig, and lb are connected to the video processing circuit 5 via a red video output circuit 4r1, a green video output circuit 4gs, and a blue video output circuit 4b, respectively. On the other hand, the single-tube projection type television receiver I12 receives three colors of red, green, and blue from a beam index type multicolor projection tube 2a connected to the video output circuit 6 according to a predetermined arrangement pattern. The configuration is such that color beams are sequentially switched and projected, and the video output circuit 6 outputs video outputs of each color of RGB according to an index signal.

Problems to be Solved by the Invention The above-mentioned conventional three-tube projection type television receiver has problems such as being large, heavy, and expensive; The single-tube projection television receiver 112 projects three colors using the beam index method. However, there were problems such as the resolution being considerably inferior to that of the three-tube type.

Means for Solving the Problems The present invention solves the above problems, and includes a blue/green video output circuit connected to a video processing circuit and outputting blue and green video signals; a first multicolor projection tube connected to the green video output circuit and projecting a blue video and a green video using a beam index method; and a red/green video projection tube connected to the video processing circuit and outputting red and green video signals. The gist of the present invention is to include an output circuit and a second multi-color projection tube connected to the red/blue video output circuit and projecting a red video and a blue video using a beam index method.

In this invention, the green image, which has the most influence on the brightness and resolution of the image, is projected from two multicolor projection tubes in an overlapping manner.
Red and blue images, which have little influence, are projected separately from each multicolor projection tube using the beam index method.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing an embodiment of a projection type television receiver according to the present invention.

In FIG. 1, the projection television receiver 11 has blue and green 2
Multi-color projection tube 11bg and two-color red and green multi-color projection tube 11
The video processing circuit 12 includes a blue and green video signal that supplies blue and green video signals to the multicolor projection tube 11bg.
A green video output circuit 13bg and a red/green video output circuit 13r that outputs red and green video signals to the multicolor projection tube 11rg.
g is connected. The multicolor projection tube 11bg projects a blue image and a green image using a beam index method, and the multicolor projection tube 11g projects a red image and a green image using a beam index method. Primary color images can project brighter images than those containing three primary color images.In addition, two multicolor projection tubes 11bg%l
Since the LRG projects green images overlapping each other, it is possible to maintain the resolution of the green part of the image, which is most visually appealing, to the same level as that of a three-tube projection television receiver.

As described above, in the projection television receiver 11, the green image, which has the most influence on the brightness and resolution of the image, is produced using the two beam index type multicolor projection tube 11b.
, llrg, and red and blue images, which have little influence, are projected separately from two beam index type multicolor projection tubes 11bg and 1lrb, so three primary color beam index type single tubes are used. The brightness and resolution can be improved compared to the 3-tube projection television receiver 2, and the brightness and resolution are slightly lower than the 3-tube projection television receiver 1, but it is small and mu, it can be constructed at low cost.

As described in detail, according to the present invention, the green image, which has the most influence on image brightness and resolution, is projected simultaneously from two beam index type multicolor projection tubes, so that it has less influence. Red and blue images are projected separately from two beam index type dual-color projection and dedicated tubes, so compared to a three-primary color beam index type single tube projection television receiver, the brightness is lower. Although the brightness and resolution are slightly lower than that of a three-tube projection television receiver, it has excellent features such as being small, lightweight, and can be configured at low cost. be effective.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing an embodiment of the projection type television receiver of the present invention, and Figs. 2 and 3 are examples of conventional three-tube type and single-tube type projection type television receivers, respectively. FIG.

Claims (1)

[Claims] A blue/green video output circuit that is connected to the video processing circuit and outputs blue and green video signals, and a beam index system that is connected to the blue/green video output circuit and outputs blue and green video signals. a first multicolor projection tube for projecting images; a red/green video output circuit connected to the video processing circuit and outputting red and green video signals; and a red/green video output circuit connected to the red/green video output circuit for outputting red video signals. and a second multicolor projection tube that projects a green image using a beam index method.