JPS61219274A - Television receiver - Google Patents

Abstract

PURPOSE:To view a freely magnified television screen by giving a transparent liquid crystal plate reproducing a television picture image from a video signal and an optical system magnifying and projecting the television picture image on the screen. CONSTITUTION:The transparent liquid crystal plate 3 is approached to a light source 2 by a back and forth drive device 23, whereby the projected picture image on the screen 5 is magnified. On the other hand, when the transparent liquid crystal plate 3 is approached to the side of a lens 4, the projected picture image is reduced. Accordingly as the screen, a wall, a ceiling and a window glass in a house are sufficient, which is an advantage. If the screen 5 is made semitransparent, the projected picture image can be viewed from the front and back of the screen 5. Moreover the forward lens 4 can be directly viewed as a conventional television receiver does.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a television receiver that receives and demodulates television radio waves and obtains reproduced images from a video signal or a video signal from a VTR or television camera.

[Conventional technology]

One form of a conventional television receiver of this type is one in which the reproduced image on the screen of the CRT 6 of the television box 1 is viewed from the front tube, as shown in FIG. ! 11! As shown in the figure, TV radio waves are received by the antenna 10, a desired radio wave is selected by the chainer circuit section 11, and the selected signal is transmitted to the PIF-8IP circuit section 1.
2, it is separated and amplified into an audio signal and an image signal. Although the audio signal is not shown in FIG. 5, the 0-picture signal that is output as audio output to the speaker via the audio amplifier is color demodulated in the chroma circuit section 13 and sent to the KGB matrix circuit 14.
Then, the deflection circuit 15 reproduces the picture on the C box T6. A method for enlarging a television image is to extract the KGB demodulated output signal from the IJx circuit section 14 shown in Fig. 5 to the outside, and use a projector, which has a light source for each KGB and enlarges the image, to create a large television receiver. There is also a machine.

Also, KG as shown in the receiving circuit block shown in Fig. 6
The output of the B matrix 14 is connected to the X of the liquid crystal die display 19.
An X driver circuit 17 is provided at the output of the driver circuit 18 and the synchronous control circuit section 16 to reproduce a reproduced image on the liquid crystal display 19, and a power supply circuit section 20 and a backlight drive are used to illuminate the back side of the liquid crystal display 19. A liquid crystal television that has a circuit section 21 and a backlight 22 to view transmitted light, and as shown in FIG. There is also a form similar to a small television receiver that transmits light and looks at the transparent surface.

[Problem that the invention seeks to solve]

In the conventional television receiver described above, the CR shown in Figure 83
In a television receiver in which the reproduced image on the T6 screen is viewed from the front, the screen size is determined by the size of the CRT6 [7, CR
If T6 is made larger, there will be a significant increase in price, there will be difficulties in manufacturing, and there will be restrictions on size.

In the television receiver using the transmissive liquid crystal panel 3 shown in FIG. 4, the size of the transmissive liquid crystal panel is limited because it is difficult to make the transmissive liquid crystal panel large. Furthermore, as a property of the liquid crystal plate, the incident light 7
When viewing the reproduced screen that is transmitted by the reflection plate 8 and the reflected light 9, there is a problem that if the viewing angle of the transmitted light of the transmissive liquid crystal panel is slightly shifted from the position where the transmitted light is viewed directly from the front, the viewing angle becomes K<. .

Although the screen of a TV receiver called a projector is larger, it has a dedicated spring and a light source for enlarged projection, and it is relatively large compared to the TV receiver shown in Figure 3 above, depending on the magnification ratio. However, there are problems in that it is a relatively large receiver and is also expensive.

[Means for solving problems]

The television receiver of the present invention includes a light source, a means for outputting a video signal, a transmissive liquid crystal plate for reproducing a television image from the video signal, and an enlarged projection of the television image reproduced on the transmissive liquid crystal plate onto a screen. and means for moving the transmissive liquid crystal plate to change the magnification of the television image with respect to the screen.

〔Example〕

FIG. 1 shows an embodiment of the invention. A transmissive liquid crystal panel 3 and a light source 2 that illuminates the liquid crystal panel are provided in the television box 1, and the light from the light source 2 is transmitted through the transmissive liquid crystal panel 3 and reproduced on the transmissive liquid crystal panel 3 to produce nine pictures. The external screen 5 is passed through a lens 4 that is part of the optical system provided on the same axis.
Copy the image to

Here, the conventional receiving circuit shown in FIG. 6 can be used as a receiving circuit for reproducing an image on the transmissive liquid crystal panel 3.

FIG. 2 is a side view showing the operation of FIG. 1. By bringing the transmissive liquid crystal plate 3 closer to the light source 2 using the front-back drive device 23, the projection screen on the screen 5 is enlarged, while when the transmissive liquid crystal plate 3 is brought closer to the lens 4 side, the projection screen is particularly reduced. be done. Therefore, there is an advantage that the screen 5 may be a wall, a ceiling, or a window glass in the house. Furthermore, by making the screen 5 semitransparent, it is possible to view the projection screen from the front and back sides of the screen 5. It is also possible to directly see the lens 4 on the front side of the figure.

〔Effect of the invention〕

As explained above, the present invention has the advantage that it is possible to freely view an enlarged television screen with inexpensive equipment and configuration.

[Brief explanation of the drawing]

FIGS. 1 and 2 are configuration diagrams showing an embodiment of the present invention. A side view, FIGS. 3 and 5 are perspective views showing one of the conventional examples,
The block diagram, FIG. 4, and FIG. 3g6 are perspective views and block diagrams showing another conventional example. 1...TV box, 2...Light source,
3... Transmissive liquid crystal plate, 4... Lens,
5...Screen, 6...C 几T, 7
...Incoming light, 8...Reflector, 9...
...Reflected light, 10...Antenna, 11...
... Chainer circuit section, 12 ... PIF, 8
IF circuit section, 13...Chroma circuit section, 14...
...RGB matrix circuit section, 15...
Deflection circuit section, 16... Synchronous control circuit section, 17.
...Y driver 4th circuit section, 18...X driver circuit section, 19...Liquid crystal display, 20
......Power circuit section, 21.../Lift 2 light drive circuit section, 22...Backlight, 23...
...Front-rear drive device. Agent Patent Attorney Susumu Uchihara 1 ゛飄ゝ−1− σ Unauthorized Daughter-in-law

Claims (1)

[Claims] a light source, a means for outputting a video signal, a transmissive liquid crystal plate for reproducing a television image from the video signal, an optical system for enlarging and projecting the television image reproduced on the transmissive liquid crystal plate onto a screen, and the transmissive liquid crystal plate. A television receiver comprising means for moving a liquid crystal plate to change the magnification of the television image with respect to the screen.