JPS64710B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to display devices such as televisions, displays, and various signal generators.

Structure of a conventional display device and its problems FIG. 1 shows a block diagram of a conventional display device.
In FIG. 1, the display devices include a polarity inversion program 1, a keyboard 2, a computer 3, and a display 4.
Consists of.

Keyboard 2, computer 3, display 4
is composed of hardware, and a computer 3 processes data in response to data input from a keyboard 2, and outputs the processed data to a display 4.

Therefore, when the polarity reversal program 1 is input from the keyboard 2, data processing for polarity reversal is performed by the computer 3, and its output is displayed on the display 4.
will be displayed. This display state corresponds to the contents of the polarity inversion program, and it is possible to invert the polarity of part or all of the screen. However, this conventional method requires (1) creation of software;

(2) Lack of immediacy due to time required for software input, etc.

(3) Software costs are high.

There are other problems.

Purpose of the invention The present invention has been made in view of the above problems, and
The purpose of the present invention is to provide a display device which has a polarity inversion circuit built into a part of the circuit in the display device and can easily and instantly invert the polarity by operating a switch, in contrast to the conventional software-based inversion method.

Structure of the Invention The present invention adds a polarity reversal circuit to the signal processing process from video signal input to signal output to a display, and reverses the polarity of the circuit by operating an electrical or mechanical switch. .

Description of examples Figures 2a and 2b show embodiments of the invention.

In Figures 2a and b, 5 is a signal source, 6 is a polarity inversion circuit, 7 is an input circuit, 8 is a video output circuit, 9
The display 10 is a switch, and when the switch 10 is open, the polarity of the video signal passing through the polarity inversion circuit 6 is inverted, and when it is open, the video signal passing through it is not changed.

Here, FIG. 2a shows that when the switch 10 is closed, the polarity of the video signal generated by the signal source 5 is inverted by the polarity inversion circuit 6, and then signal processing is performed by the input circuit 7, and the video output circuit 8 Output the video signal with
It is displayed on the display 9. Furthermore, when the switch 10 is opened, the video signal generated by the signal source 5 is not inverted by the polarity inversion circuit 6, but is outputted in a normal state by the video output circuit 8, and is displayed on the display 9. Next, as shown in FIG. 2b, when the switch 10 is closed, the video signal generated by the signal source 5 is first processed by the input circuit 7, and the polarity is inverted by the polarity inversion circuit 6. The output circuit 8 outputs the video signal and displays it on the display 9. When the switch 10 is opened, the video signal generated by the signal source 5 is not inverted by the polarity inverting circuit 6, but is output from the output circuit 8 in a normal state and displayed on the display 9.

FIG. 3 shows the internal configuration of the polarity inversion circuit shown in FIGS. 2a and 2b. In the figure, 11 is a signal detection and input circuit, 12 is a polarity reversal switching discrimination circuit, and 1
3 is an inverting circuit, 14 is a signal output circuit, 15 is an inversion/normal operation selector switch for the polarity inverting circuit, 16 is an input terminal, and 17 is an output terminal.
The signal inputted from the input circuit 6 is detected and amplified by the input circuit 11, and then transmitted to the inverting circuit 13.
Further, the polarity reversal switching determination circuit 12 determines whether or not to perform the polarity reversal operation, and when it is determined that the polarity reversal operation is to be performed, the polarity reversal operation is performed in the inverter circuit 13, and then the signal is sent to the output circuit 14. , output terminal 1
An output signal appears at 7.

FIG. 4 shows a specific circuit diagram of the circuit shown in FIG. 3. In FIG. 4, 18a, 18b, 18c
are independent input terminals, and the output terminals 19a and 19a correspond to the input terminals 1a, 1b, and 1c, respectively.
Output signals appear at 19b and 19c. When the switch 15 is in the "closed" state, the input terminal 18
Output signals having the same phase as a, 18b, and 18c appear at output terminals 19a, 19b, and 19c. Also, when the switch 5 is in the "open" state, the input terminals 18a, 18
An output signal having a phase opposite to that of b and 18c appears. In addition,
20a, 20b, and 20c are two-input exclusive-OR circuits.

The above circuit has input terminals 18a, 18b, 18
By adding red (R), green (G), and blue (B) signals to c, respectively, black and white inversion is performed in black and white (when R, G, and B are in the same phase), and in color ,
A signal that is the complementary color of the input signal appears at the output. Therefore, by incorporating the circuit shown in FIG. 4 into a display device (for example, a computer display), the polarity of the input signal can be reversed by
It is possible to do it with.

Effects of the Invention As described above, according to the present invention, the polarity of a video signal can be inverted using an inverting circuit within a display device regardless of the signal source. Therefore, when inverting an image, the operation is easy and no troublesome effort is required. Also, when creating sentences, black characters can be displayed on a white background, just like when writing with a pen on paper. Furthermore, the negative film is converted into electrical signals using a TV camera, etc.
Using the present invention, you can see normal pictures.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional display device, FIGS. 2a and 2b are block diagrams showing display devices in each embodiment of the present invention, and FIG. 3 is a block diagram showing a polarity inverting circuit of the same embodiment. FIG. 4 is a specific circuit diagram of the circuit shown in FIG. 3. 5...Signal source, 6...Polarity inversion circuit, 7...Input circuit, 8...Video output circuit, 9...Display device, 1
0, 15...Switch, 11...Input circuit, 12
...Polarity reversal switching determination circuit, 13...Reversal circuit,
14...Signal output circuit.

Claims (1)

[Claims] 1 a switch means for generating an inversion signal for inverting the polarity of the video signal generated by the signal source; a polarity inversion circuit for inverting the polarity of the video signal in accordance with the inversion signal generated by the switch means; A display device comprising an output circuit for outputting a video signal that has passed through an inversion circuit to a display device.