JPH0381883A - Picture inverting circuit device - Google Patents

Abstract

PURPOSE:To easily instruct image inverting operation by changing a control signal sent from a control part. CONSTITUTION:At the time of an inversion mode, the inversion mode is set up by turning on/off a part of bits constituting a signal sent from a control register 11. An A address register 3 sends address signals to an A memory 1 in the order of addresses, reads out character name data and sends the read data to a B memory 4. The B memory 4 sends addresses to an address generating part 6 successively from the address finally stored in the B memory 4 and sends data constituting a character to a bidirectional shift register 8, so that the supplied character data are sent to a color data converter 9 while shifting the data in the reverse direction and displayed as a graphic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screen inversion circuit device used in image display devices and the like.

[Prior art and its problems] As shown in Figures 4 and 5, when reversing all images displayed on a display screen by 180 degrees, conventionally the data for displaying the images on the screen is This reversal action was performed by manipulating it. Therefore, performing an image reversal operation requires complicated calculations, which poses a problem in that it places a heavy burden on the software creator.

The present invention has been made to solve these problems, and an object of the present invention is to provide a screen reversal circuit device that can easily instruct an image reversal operation.

[Means for Solving the Problems] The present invention provides a first memory in which an image name, which is data that designates an address where display image configuration data, which is data for displaying an image, is stored. , a first address generator that sends out different address signals when reading out the image name depending on the normal mode and the inversion mode, and a second memory that stores the image name read out from the first memory. a second address generator that sends out an address signal while incrementing or decrementing an address for reading out the image name according to the normal mode or inversion mode; a readout changing unit that is supplied with the image configuration data read out by the user and changes the shift direction according to the normal mode and the inversion mode when transmitting the image configuration data while shifting; and the first address generator described above; , a control section that sends a control signal instructing the second address generator and the readout change section to the normal mode or the inverted mode.

[Operation] With this configuration, whether or not to invert the screen can be determined by a control signal sent from the control unit. That is, when the first address generator is supplied with the control signal, it generates an address in a direction opposite to the direction in which addresses are generated in the normal mode. Further, when the second address generator is supplied with the above control signal, the second address generator is configured to control the reading direction of the data read out using the address signal sent out by the first address generator and written to the second memory. Do this in the opposite way to normal mode. In addition, the readout change section is
By supplying the control signal, the shift direction of the display image configuration data displayed on the screen is reversed from that in the normal mode. In this way, the selection between the normal mode and the inversion mode can be performed using the control signal sent by the control section.

[Embodiment] In FIG. 1 showing an embodiment of the screen inverting circuit device of the present invention, a character name indicating an address where character data constituting a character such as a figure displayed on the screen is stored is stored. On the input side of the character name storage A memory (hereinafter referred to as memory) l for image display,
An A address generator 3 is connected which generates an address signal according to the H, V, and output values of the counter 2. The output side of the A memory 1 is connected to an image display character name storage B memory (hereinafter referred to as B memory) 4 which stores the data sent by the A memory 1, and the B memory 4 also stores the data sent to the B memory. A B address generator 5 that generates address signals for writing and reading is connected. The output side of the B memory 4 is connected to a character ROM address generator 6 that generates an address signal to be sent to a character data storage memory 7 in which data constituting the character specified by the character name is stored. There is.

The output side of the character data storage memory 7 is connected to a bidirectional shift register 8 which can shift the character data supplied from the character data storage memory 7 in either the forward direction or the reverse direction according to a shift clock signal.

The output side of the bidirectional shift register 8 is connected to a color data conversion circuit 9 that converts the character data sent from the bidirectional shift register 8 into color data. image display device 10
connected to.

Further, the above-mentioned components 3.5.
A control register 11 is connected which sends out a control signal for inverting or not inverting displayed characters by instructing data readout, shift direction, etc. in step 6.8. This control register 1! teeth,
It sends bit data to invert the screen according to the supplied inversion instruction signal, and is part of the above component 3.5.6.8.
When this bit data is supplied, the direction of data reading, etc. is reversed.

The operation of the screen inverting circuit device configured in this manner will be described below.

First, a case will be described in which the image displayed on the screen is normally displayed without being reversed.

Now, when the output values of the H, V and counter 2 in the vertical operation direction are values as shown by the arrows in FIG. Send the signal to A memory l. The data indicating the character names a° to Q' stored at addresses a to Q, which are read out from the A memory 1 using this address signal, are temporarily stored in the B memory 4 in the order in which they were read out. Ru.

Since a signal instructing normal screen display is now being sent from the control register II, the B address generator 5 sends out an address signal to the B memory 4 while incrementing the address data. In accordance with the supplied address signal, character name data stored in the B memory 4 is read out and sent to the character ROM address generation section 6.

The character ROM address generator 6 generates the character R specified by the supplied character name data.
A character data storage memory 7 that generates an OM address signal and is instructed by this character ROM address signal.
The character data at the address is sent from the character data storage memory 7 to the bidirectional shift register 8. At this time, the character data sent from the character data storage memory 7 is in the order of, for example, a°→Q'''.

Now, since a signal instructing normal screen display is being sent from the control register 11, the bidirectional shift register 8 inputs the supplied character data in the order of a-4Q'' one bit at a time according to the supplied shift clock signal. The data is shifted and sent to the color data conversion circuit 9.

The sent character data is converted into color data by a color data conversion circuit 9, and then displayed on, for example, a television screen.

Next, a case will be described in which the orientation of the image as shown in FIG. 4 is reversed by 180 degrees on the display screen as shown in FIG. 5.

In this inversion mode, the inversion mode is set by turning on/off some of the constituent bits of the signal sent from the control register 11.

By setting the inversion mode, the A address generator 3 sequentially sends address signals to the A memory 1 in the order of addresses, for example m→n1..., a→Q, and the A memory 1 receives the supplied address signal. The data indicating the character name stored at each of the above addresses is read out in order, and the read data is sent to the B memory 4.

Next, in the B memory 4, an address signal is supplied from the B address generator 5 to the B memory 4 while sequentially decrementing the address starting from the address last stored in the B memory 4, and the B memory 4 responds to the character The name data is sent to the character ROM address generation section 6.

The character ROM address generator 6 generates an address signal according to the supplied character name data, and the character data storage memory 7 generates data constituting the character, which is stored at the address specified by the supplied address signal. is sent to the bidirectional shift register 8. The order of the character data supplied to the bidirectional shift register 8 at this time corresponds to the read order of the addresses in the A memory 1 described above.

Since the bidirectional shift register 8 is supplied with a signal indicating the inversion mode sent by the control register 2, the character and data are colored while shifting the supplied character data in the opposite direction to that in the normal mode. It is sent to the data conversion circuit 9.

Then, by displaying the character data sent from the color data conversion circuit 9 on a screen, an inverted image as shown in FIG. 5 can be obtained.

In this way, in order to obtain an inverted image with the screen inversion circuit device of this embodiment, it is only necessary to turn on/off the bit data of the signal sent from the control register 11. There is no need for image software creators to perform complex calculations.

[Effects of the Invention] As detailed above, according to the present invention, the display direction of the displayed image can be reversed by changing the control signal sent by the control unit.
It is possible to provide a screen reversing circuit device that can easily instruct an image reversing operation.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the screen inverting circuit device of the present invention, FIG. 2 is a diagram showing the operation of the screen inverting circuit device of the present invention in normal mode, and FIG. 3 is a block diagram showing the structure of an embodiment of the screen inverting circuit device of the present invention. FIG. 4 is a diagram showing an image in the normal mode, and FIG. 5 is a diagram showing an image in the reversing mode. 3...A address generator, 5...B address generator, 8...bidirectional shift register, 11...control register. Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) The image name, which is data that specifies the address where the display image configuration data, which is the data for displaying the image, is stored is stored in the first memory. A first address generator that sends out different address signals when reading an image name, and a second memory that stores the image name read out from the first memory, depending on the normal mode and the inverted mode. a second address generator that sends out an address signal while incrementing or decrementing the address for reading out the image name; and supplying image configuration data read out using the image name read out from the second memory. a readout change unit that changes the shift direction according to the normal mode and the inversion mode when transmitting the image configuration data while shifting; the first address generator, the second address generator, and the readout change unit; 1. A screen inversion circuit device comprising: a control section that sends a control signal instructing the section to a normal mode or an inversion mode.