JPH06217214A - Video circuit - Google Patents

Abstract

PURPOSE:To see plural channels at the same time on one television receiver without using a multi-screen system. CONSTITUTION:The video output of one channel is converted from analog to digital and stored in a frame memory 3, and data in a frame memory part 3 are read out with a timing signal and outputted by a D/A conversion part 4 to a video signal composition part 5. A video signal of the other channel is similarly converted from analog to digital and stored in a frame memory part 7, and the output is read out with the timing signal, converted from digital to analog, and displayed on a display device 9. A control part 10 controls the opening/closing timing of spectacle shutters in synchronism with the read timing signal to drive spectacle shutter driving parts 13 and 14, and only the images of the specific channels can be seen through spectacles 15 and 16 with the liquid crystal shutters with the driving signals of the spectacle shutter driving parts 13 and 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver or the like.

[0002]

2. Description of the Related Art With the spread of high-definition broadcasting and satellite broadcasting, the number of television receivers tends to increase,
For example, high-definition TV receivers are expensive, and you need to buy multiple TV receivers to watch multiple channels at the same time, and the cost required to purchase them is high. . In addition, since each purchased television set must be installed in each room, it may be difficult to secure a space for installation. Conventionally, there is a multi-screen method that projects the images of multiple channels on one screen so that you can watch multiple channels at the same time on a single TV receiver. Has a drawback that it is bothersome to see because it is displayed at the same time.

[0003]

As described above, in the prior art, in order to watch a plurality of channels at the same time, it is necessary to purchase a plurality of television receivers, which increases the cost required and , Has the problem that space is also needed to install multiple TV sets,
Further, the multi-screen method has a drawback that it is troublesome to see. It is an object of the present invention to provide a television receiver capable of simultaneously watching a plurality of channels without depending on the multi-screen method.

[0004]

In order to solve the above-mentioned problems, the present invention enables the tuner section to simultaneously tune a plurality of channels, so that the video output of one channel of the tuner section is A / The D conversion unit converts the analog signal into a digital signal, and the digital video signal of the A / D conversion unit is stored in the frame memory unit according to the write timing signal of the timing generation unit. The video data in the frame memory unit is read by a read timing signal from the timing generation unit, converted from a digital signal to an analog signal by the D / A conversion unit, and output to the video signal synthesis unit. The video output of the other channel is also A / D converted in the same manner as above, stored in the frame memory unit by the write timing signal of the timing generation unit, read by the read timing signal from the timing generation unit, and D / A converted, Input to the video signal synthesizer. The video signal synthesizing unit synthesizes the respective inputs and displays them on the display device. The control unit controls the opening / closing timing of the glasses shutter of the glasses timing generation unit in synchronization with the read timing signal from the timing generation unit, and the glasses with liquid crystal shutters control the voltage applied to the liquid crystal by the drive signal of the glasses shutter drive unit. Then, only the image of the specified channel can be seen by the glasses with liquid crystal shutters.

[0005]

With the above construction, according to the video circuit of the present invention, for example, the person A wears the glasses with the liquid crystal shutter for the video signal of the channel 1, and the person B the channel 2.
When wearing glasses with a liquid crystal shutter for the video signal of, and watching one TV together, wear glasses of the person A on channel 1.
When the image of is passed, the glasses of person B are closed. Further, since the glasses of the person A are closed when the image of the channel 2 is passing through the glasses of the person B, the persons A and B can only see the predetermined channels.

[0006]

Embodiments will be described in detail below with reference to the drawings.
FIG. 1 is a block diagram of a video circuit according to the present invention. In the figure, 19 and 20 are tuner units for respectively tuning a plurality of channels of a signal received by an antenna 1. The output of the tuner section 19 is output by a block surrounded by a broken line.
1 The analog-to-digital signal is converted by the A / D converter 2 of the signal processor 17. A frame memory unit 3 stores the digital signal of the A / D conversion unit according to a write timing signal from the timing generation unit 11. The data in the frame memory unit 3 is read by a read timing signal from the timing generation unit 11 and converted from a digital signal to an analog signal by the D / A conversion unit 4.
On the other hand, the output of the tuner unit 20 is converted from an analog signal to a digital signal by the A / D conversion unit 6 of the second signal processing unit 18 shown by the block surrounded by the broken line. Reference numeral 7 denotes a frame memory unit for converting the digital signal of the A / D conversion unit into a timing generation unit.
It is stored by the write timing signal from 11. The data of the frame memory unit 7 is the timing generation unit.
D is read by the read timing signal from 11
The / A converter 8 converts the digital signal into an analog signal. The respective analog outputs of the first and second signal processing sections are combined by the combining section 5 by the combining timing signal from the timing generating section 11 and displayed on the display device 9 such as a CRT. The control unit 10 controls the opening / closing timing of the glasses shutter of the glasses timing generation unit 12 in synchronization with the read timing signal from the timing generation unit 11, and the glasses timing generation unit 12 controls the first and second glasses shutter drive units. Drive 13 and 14, respectively. Glasses 1 and 2 with liquid crystal shutters 15 and 16 are driven by the driving signals of the glasses shutter driving units 13 and 14, respectively. When a voltage is applied to the liquid crystal, the surface becomes black and opaque to block light, and a voltage is applied. Otherwise, it is transparent and allows light to pass through, so you can only see one of the screens.

The operation of the video circuit according to the present invention will be described below. FIG. 2 shows the timing waveforms of the operations of the above two video signals and the two glasses with liquid crystal shutters.
Is the output signal waveform of the first signal processing unit, and 22 is the output signal waveform of the second signal processing unit. The signal waveform obtained by doubling the frequency of each output signal waveform and combining the video signal 1 and the video signal 2 is 23. The signal waveform 24 is a timing waveform for turning on the glasses 1 with the liquid crystal shutters and allowing the image of the video signal 1 to pass through, and the signal waveform 26 during that time.
Is a timing waveform for turning off the glasses 2 with the liquid crystal shutter so that the image of the video signal 2 does not pass through. On the contrary, the signal waveform 25 turns off the glasses 1 with the liquid crystal shutter so that the image of the video signal 1 does not pass through, and the signal waveform 27 shows the glasses 2 with the liquid crystal shutter 2.
Is a timing waveform for turning on the switch to turn on the image of the video signal 2. At the above timing, for example, when the person A wears the glasses with the liquid crystal shutter for the video signal of the channel 1, and the person B wears the glasses with the liquid crystal shutter for the video signal of the channel 2 to watch one TV together, When the image of channel 1 is passing through the glasses of the person A, the glasses of the person B are closed. On the other hand, when the image of channel 2 is passing through the glasses of the person B, the glasses of the person A are in a closed state, and these opening and closing operations are repeated at the normal vertical synchronizing signal cycle of the television. For the person B and the person B, only the image of their own channel can be seen on the television screen, and the image of the channel of the other party cannot be seen.

[0008]

As described above, according to the video circuit of the present invention, it is possible to alternately output the video of a plurality of channels by one television receiver, and the viewer side has the liquid crystal shutter. With glasses, it is possible to see only the image of one's own channel, so there is no cost to purchase two TV sets, and there is an effect that two installation sites are not required.

[Brief description of drawings]

FIG. 1 is a block diagram of a video circuit according to the present invention.

FIG. 2 is a timing waveform of the operation of the video circuit according to the present invention.

[Explanation of symbols]

 1 Antenna 2 A / D Converter 3 Frame Memory 4 D / A Converter 5 Combiner 6 A / D Converter 7 Frame Memory 8 D / A Converter 9 Display 10 Control 11 Timing Generator 12 Glasses Timing Generation unit 13 First glasses shutter driving unit 14 Second glasses shutter driving unit 15 Glasses with liquid crystal shutters 1 16 Glasses with liquid crystal shutters 2 17 First signal processing unit 18 Second signal processing unit 19 Tuner unit 1 20 Tuner unit 2

Claims (1)

[Claims] 1. A tuner unit having two tuner units, wherein an output of one tuner unit of the two tuner units is connected to an input of an A / D converter unit, and an output of the A / D converter unit is connected to a first frame memory. The output of the first frame memory unit to D
The first signal processing section connected to the A / A conversion section and the output of the other tuner section are connected to the input of the A / D conversion section.
A second signal processing unit in which the output of the / D conversion unit is connected to the second frame memory unit and the output of the first frame memory unit is connected to the D / A conversion unit, and the respective A / D conversion units Write the output of the above into the first and second frame memory units,
A synthesizing section for reading out every half cycle and displaying on the display section, a timing generating section for generating timing signals for writing and reading of the first and second frame memory sections, and a control section for controlling the timing generating section. Two
A pair of glasses with a liquid crystal shutter, and a pair of glasses timing signal generator that generates a timing signal for each pair of glasses with a liquid crystal shutter in synchronization with a video signal for each half cycle read by a read signal from the timing generator. A video circuit, comprising: a glasses shutter drive unit that alternately opens and closes the shutters of the glasses with liquid crystal shutters according to the timing signal of the glasses shutter.