JP2613933B2 - Display capacity conversion device and display system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a display capacity conversion device and a display system for converting display capacity when a specific display device displays display data having a capacity different from the display capacity. About.

[Related Art] In recent years, as information processing apparatuses have become widespread, the display capacity of display apparatuses has tended to increase, and display data created by information processing apparatuses having conventional display capacities has been reduced. When displaying on a large display device, a problem arises in the way of displaying. That is, for example, display data created on a conventional information processing apparatus having a display capacity of 640 dots in the horizontal direction × 200 dots in the vertical direction is directly transferred to an information processing apparatus having a display capacity of 640 dots in the horizontal direction × 400 dots in the vertical direction and displayed. In this case, naturally, there is a problem that a band-shaped sky region extending in the horizontal direction on the screen is generated. In order to solve such a problem, for example, in a device configuration as shown in FIG. 2, a small amount of display data is stored in the display memory 6, and the display memory address generation unit 8 stores each line in 2 lines.
As shown in FIG. 3, the data to be displayed on the display device 2 via the display device interface 4 is enlarged twice in the vertical direction by reading the data (for example, Japanese Patent Laid-Open No. 59-61).
No. 874), or as shown in FIG. 4, a display control method in which the line spacing of display data is made variable in accordance with designated line data, thereby realizing a line spacing enlargement (for example, Japanese Patent Application Laid-Open No. No. 65883) is known, in which an empty area (non-display portion) on a display device screen is eliminated.

[Problem to be Solved by the Invention] In the above-described conventional technology, display data having a certain display capacity is simply enlarged in a vertical direction and displayed on a display device having a larger display capacity. The aspect ratio of the display screen of the data (for example, the screen aspect ratio of the data display such as 640 horizontal dots × 200 vertical dots) and the aspect ratio of the display screen of the display device (for example, 4:
Regarding the aspect ratio of the display screen size such as 3 and the aspect ratio of the display pixel dot such as 1: 2.4), display data of one display capacity is displayed on a display device of another display capacity. In this case, there is a problem that an image is distorted due to a difference in aspect ratio of a display screen.

SUMMARY OF THE INVENTION It is an object of the present invention to display a display data of a certain display capacity on a display device of another display capacity by effectively utilizing a display capacity of the display device and to display an aspect ratio inherent in the display data. It is an object of the present invention to display on a display device in consideration of quality, legibility and the like.

Means for Solving the Problems In order to achieve the above object, a display capacity conversion device according to the present invention converts a first display data constituting a two-dimensional image into a non-integer multiple of the number of lines of the image. A display capacity conversion device capable of converting to a second display data comprising: a line determining means for specifying a line to be multiplied or omitted according to the non-integer scaling factor; Control means for multiplying or omitting the first display data on a line-by-line basis.

According to another aspect, the display capacity conversion device according to the present invention converts the first display data forming the two-dimensional image into the second display data having a non-integer multiple of the number of dots of each line of the image. A convertible display capacity conversion device,
Dot designation means for designating dots to be multiplied or omitted in accordance with the non-integer magnification, and, for each line, the first display data for each dot designated by the dot designation means in dot units. And multiplying or omitting control means.

According to still another aspect, a display capacity conversion device according to the present invention converts a first display data constituting a two-dimensional image into a non-integer multiple of the number of lines of the image and a non-integer of the number of dots of each line. What is claimed is: 1. A display capacity conversion device capable of converting to a second display data having a double number of dots, comprising: a dot designation means for designating dots to be multiplied or omitted in accordance with a non-integer scaling factor relating to the number of dots. And line determining means for designating lines to be multiplied or omitted according to a non-integer scaling factor relating to the number of lines, and for each line, the first display for the dot designated by the dot designating means The data is multiplied or omitted in dot units, and the first display data is multiplied or omitted in line units for the line specified by the line specifying means. It is characterized in that a control means.

The line designating means or dot designating means preferably has means for storing, for each line or dot, data for determining how many times the line or dot should be multiplied or omitted.

Also, a display system according to the present invention is a display system including a display memory for storing the second display data, the display capacity conversion device, and a display device for displaying the second display data, wherein the display memory In the writing step, the display capacity conversion device duplicately writes or omits the writing of the designated line or dot of the first display data, thereby obtaining the first display data.
The display data is converted into the second display data.

Another display system according to the present invention includes a display memory that stores the first display data, the display capacity conversion device,
A display device for displaying the second display data, wherein the display capacity conversion device is configured such that, in the step of reading the display memory, the display capacity conversion device overlaps the designated line or dot of the first display data. The first display data is converted to the second display data by reading out the data or omitting the reading.

Still another display system according to the present invention includes a display memory storing the first display data, the display capacity conversion device, a display device displaying the second display data, and displaying the read data of the display memory in the display memory. An interface means for converting a signal suitable for the device, wherein the display capacity conversion device converts the first display data read from the display memory by the interface means at the stage of conversion processing by the interface means. One display data is converted to the second display data. In this display system, a character generator may be provided downstream of the display memory, and an output of the character generator may be input to the interface means.

Another display system according to the present invention includes a display memory for storing first display data, a character generator receiving an output of the display memory, and a display device for displaying second display data output from the character generator. A display system having different display capacities of the first display data and the second display data, wherein the character generator stores character font data having a size corresponding to the display capacity of the second display data. Is what you do. In this display system, the character generator stores character font data of a plurality of sizes corresponding to a plurality of second display data, and further includes a selection unit for selecting any one of the plurality of sizes. It may be.

The display capacity conversion method according to the present invention is a method for converting the first display data for the first display device having the first pixel dot aspect ratio (X1: Y1) (where X1, Y1 is an irreducible number) into the second display data. Pixel dot aspect ratio (X2: Y2) (however, irreducible of X2 and Y2)
A display capacity conversion method for converting into second display data for a second display device, comprising: using the display capacity conversion device, changing the number of dots in the X-axis direction of the first display data to X1 / X2 times and change the number of dots in the Y-axis direction to Y1 / Y2
The second display data is generated by multiplying the second display data.

The display capacity conversion method according to the present invention converts the first display data for the first display device having the first pixel dot aspect ratio (1: Y1) into the second pixel dot aspect ratio (1: Y1).
A display capacity conversion method for converting into the second display data for the second display device having 2), wherein the display capacity conversion device is used to determine the number of lines constituting the first display data.
The second display data is generated by multiplying Y1 / Y2 times.

A method of using a display capacity conversion device according to the present invention is a method of using a display capacity conversion device having the storage means, wherein an aspect ratio of a pixel dot of the first display device for displaying the first display data and Depending on the difference from the aspect ratio of the pixel dots of the second display device for displaying the second display data, for each line or each dot, how many times the line or dot should be multiplied or omitted. It is characterized in that data for determining the perception is determined and the data is stored in the storage means.

As shown in FIG. 1, a typical configuration of a display system 1 of the present invention includes a display device 2 and a display device interface 4.
Display memory 6, display memory address generation unit 8,
And a display conversion unit 9.

In the present embodiment, the display capacity represents the total number of pixel dots constituting the display screen, and is determined by the number of vertical dots (the number of lines) × the number of horizontal dots.

[Operation] In the present invention, when the first display data for the first display device is converted into the second display data for the second display device having a different display capacity from the first display data, no display is performed on the second display device. In order to prevent the image from being distorted as well as to eliminate the parts, for example, the display data of the display data is displayed such that the perfect circle drawn on the first display device is displayed as a perfect circle on the second display device. To increase or decrease the capacity, as before, simply for each line or dot,
A method of equally multiplying or omitting equally may not be able to cope. Therefore, according to the present invention, in the case of enlargement, how many times to multiply each line or each dot is determined according to the magnification, and conversely, in the case of reduction, it is omitted for each line or each dot. Determine whether to do so. In the case where the first and second display devices are fixedly set, the data only needs to hold a fixed value in the line specifying means or the dot specifying means, and the display device is changed. In such a case, the data may be held in a rewritable manner.

When the first display data for the first display device is transferred to the second display device as it is, whether or not an image distortion occurs depends on whether or not the aspect ratio of one pixel dot of both display layers is equal. Decided. (Note that the aspect ratio of the pixel dot is determined by the aspect ratio of the screen size of the display device and the aspect ratio of the display data itself. Therefore, when the aspect ratio of the screen size is the same, the image is distorted. Is determined only by the aspect ratio of the display data.) Therefore, if the aspect ratios of the pixel dots of both the voter devices are not equal, the number of lines or the number of dots is changed at the magnification including non-integer as described above. By changing the magnification, the display capacity can be converted without causing image distortion.

In order to scale a line or dot to a specific integral multiple, instead of uniformly multiplying or omitting each line or dot according to the scaling factor or omitting the line or dot at regular intervals, for example, the number of lines is reduced. If the number is to be increased, it is determined in advance how many times the number is to be increased for each line, such as 1 for a certain line and 2 for a certain line. Also in the case of reducing the number of lines, lines to be omitted are similarly specified irregularly. However, in order to prevent the image from being distorted as a whole, the irregular pattern is made to appear repeatedly. For example, when increasing 200 lines to 350 lines, the first, second, and fourth lines are divided by two in units of four lines.
The pattern of doubling and doubling only the third line is repeated. The number of lines in one pattern is determined by the denominator when the magnification is represented by an irreducible fraction. The numerator indicates the number of lines after scaling with respect to the number of lines in the denominator. The same applies to dots.

According to the present invention, the display capacity can be converted at an arbitrary magnification ratio in both the vertical and horizontal directions, so that not only the non-display portion can be eliminated but also the display capacity in consideration of the aspect ratio becomes possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 5 is a block diagram showing a main part of a graphic display system for displaying a graphic image on the dot matrix display device 2a according to the first embodiment of the present invention. The display memory address generator 8 generates a display memory address 7 in the display memory 6 storing the display data, and the display memory 6 outputs the display data 5 corresponding to the display address 7. Ideographic device interface 4a
Converts the display data 5 into a dot matrix display device 2a.
For display, it is converted into a dot matrix display signal 3a including display data and a driving signal synchronized with the display data, and is supplied to the dot matrix display device 2a. Display conversion control unit 9
Is a display capacity conversion circuit for displaying display data created by an information processing device having a conventional display capacity on a dot matrix display device 2a having a different display capacity, or software for display capacity conversion. It consists of a circuit that operates according to the software.

In this embodiment, the display conversion control unit 9 controls the display memory address generation of the display memory address generation unit 8. Hereinafter, the control of the display memory address generation will be described. For the sake of simplicity, an example is shown in which the display device is represented by a display area of one character, and the conventional display capacity is 6 dots by 7 dots and the English character "A" is represented. However, the display capacity is not limited to this, and can have an arbitrary capacity of M × N dots.

A conventional method for displaying display data with a horizontal display capacity of 6 dots × 7 vertical dots and expanding the display data on a dot matrix display device 2a having a display capacity of 6 horizontal dots × 14 vertical dots will be described.

First, as shown in FIG. 7, when storing the conventional display data capacity (horizontal 6 dots × vertical 7 dots) in the display memory, the display data is enlarged twice in the vertical direction and stored. This is because when the vertical address N of the conventional display data is designated, the display conversion control unit 9
Controls the display memory address generator 8 so as to convert the vertical N address of the conventional display data into a continuous address of vertical 2N and 2N-1, and the display memory 6 stores the vertical addresses 2N, 2N-
1 stores the same display data. As a result, the display data capacity of the display memory is made the same as the display capacity of the dot matrix display device 2a, and the conventional display data (capacity: 6 dots horizontally × 7 dots vertically) is converted to the dot matrix display device 2a (capacity: 6 dots horizontally × vertically). 14 dots). By using this method, for example, the conventional horizontal 640 ×
Display data with a capacity of 200 dots vertically, 640 horizontal x 400 vertical
The image can be displayed on the dot matrix display device 2a having a dot capacity. This is shown in FIG. 9 (a).

In addition, in order to enlarge by a non-integer multiple, a register is provided in the display conversion control unit 9 and display data at an address specified in the register is stored in the display memory 6 at consecutive addresses in the same address. You can also.
For example, as shown in FIG. 9 (b), of the four vertical addresses of the conventional display data, the display data of the vertical addresses 1, 2, and 4 are respectively replaced with the vertical addresses 1, 2, and 3 of the display memory 6. 4, 6 and 7. Thus, the display data capacity of 4 vertical dots can be converted to the display capacity of 7 vertical dots. In this manner, the display conversion control unit is configured to store the display data of the first, second, and fourth addresses in the four vertical addresses with the continuous four vertical addresses in the display memory 6 with the vertical four addresses as one delimiter. 9 and continuous operation, the display data of the conventional capacity of 640 horizontal dots × 200 vertical dots
Dot matrix display device with 640 horizontal dots × 350 vertical dots
2a can be displayed.

Further, as shown in FIG. 9 (c), the display data of the vertical address 6 among the seven vertical addresses of the conventional display data is stored in the vertical addresses 6 and 7 of the display memory 6.
Thus, conventional display data having a capacity of 7 dots vertically is converted into display data having a capacity of 8 dots vertically, stored in the display memory 6, and can be displayed on the dot matrix display device 2a having 8 dots vertically. In this manner, the display conversion control unit 9 is set so that the display data of the sixth address in the seven vertical addresses is stored in the display memory 6 at two consecutive vertical addresses, with the vertical seven addresses as one delimiter, By continuous operation, it is possible to display conventional display data having a capacity of 640 horizontal dots × 350 vertical dots on the dot matrix display device 2a having a display capacity of 640 horizontal dots × 400 vertical dots.

As described above, an example has been described in which display data of an arbitrary vertical address set in the internal register of the display conversion control unit 9 is stored in the display memory 6 at a continuous vertical address, but the same applies to an arbitrary horizontal address. And the display conversion control unit 9
The display data at an arbitrary horizontal address set in the internal register is stored in the display memory 6 at consecutive horizontal addresses,
As a result, the horizontal dot capacity of the conventional display data can be changed to a dot matrix display device 2a having a different horizontal dot capacity.
Display converted for use becomes possible.

The data of the address set in the internal register of the display conversion control unit 9 is stored in the ROM or can be set arbitrarily even after the display device is started.

Next, as shown in FIG. 8, the conventional display data capacity (horizontal 6 dots × vertical 7 dots) is stored in a display memory of the same capacity, and output display data from this display memory is converted and displayed. A case will be considered in which display is performed on a dot matrix display device having a different data capacity (capacity: 6 dots in width × 14 dots in height). For this purpose, when reading out display data from the display memory 6 with respect to the dot matrix display device 2a,
The display conversion control unit 9 controls the display memory address generation unit 8 so as to specify the data address N of the display memory 6 twice consecutively.

Display data with a capacity of 640 (horizontal) × 200 dots (vertical)
Dot matrix display with a capacity of 0 x 400 dots
2a can be displayed. This is shown in FIG. 9 (a).

In the display conversion control unit 9, a register is provided internally to store the display address when the same display data is continuously read from the display memory 6, and the display address is designated in the register of the display conversion control unit 9. When the reading of the display data of the address is requested, the display data specified by this address can be output twice from the display memory 6 to the dot matrix display device 2a for display. For example, as shown in FIG. 9 (b), the conventional display data is stored in the display memory as it is, and among the four vertical addresses of the conventional display data, the vertical addresses 1, 2, 4
Is set in the register of the display conversion control unit 9, and when the conventional display data is read from the display memory 6, if the addresses of the vertical addresses 1, 2, and 4 are designated, the same addresses are successively used. And specify the vertical address in the display memory 6 as 1,1,
The display data is read out by designating 2, 2, 3, 4, and 4, and is displayed on the dot matrix display device 2a (vertical capacity 7 dots). As a result, the conventional display data capacity of 4 dots vertically in the display memory 6 can be converted to a display capacity of 7 dots vertically. As described above, the display conversion control is performed such that the display data of the first, second, and fourth addresses are successively transferred and displayed on the dot matrix display device 2a, respectively, with the four vertical addresses as one delimiter. When set in the register of the unit 9 and operated continuously, it is possible to display conventional display data having a capacity of 640 dots in the horizontal direction × 200 dots in the vertical direction on the dot matrix display device 2a having a display capacity of 640 dots in the horizontal direction and 350 dots in the vertical direction. Become.

Further, as shown in FIG. 9 (c), the vertical address 6 is set in the register of the display conversion control section 9 among the conventional vertical 7 addresses of the display data stored in the display memory 6, and the vertical address is set when the display data is read. The display conversion control unit 9 controls the display memory address generation unit 8 so as to read the address 6 twice consecutively, and transfers display data corresponding to the capacity of 8 dots vertically to the dot matrix display device 2a having the capacity of 8 dots vertically. . In this way, the register of the display conversion control unit 9 is configured to read the sixth address of the seven vertical addresses from the display memory 6 twice consecutively with the seven vertical addresses in the conventional display data capacity as one delimiter. The display conversion control unit 9 controls the display memory address generation unit 8 to output the sixth vertical address out of the seven vertical addresses to the display memory 6 twice consecutively, and displays the display data having a capacity of eight vertical dots in a dot matrix. Display device 2a
When the continuous operation is performed so that the display data can be displayed on the screen, for example, the conventional display data having a capacity of 640 dots in the horizontal direction and 350 dots in the vertical direction is
It is possible to display on the dot matrix display device 2a having a display capacity of 0 dots × 400 dots vertically.

As described above, an example in which an arbitrary vertical address set in the internal register of the display conversion control unit 9 is continuously given to the display memory 6 when reading display data from the display memory 6 storing the conventional display data has been described. However, this is the same for any horizontal address, and the display data of any horizontal address set in the internal register of the display conversion control unit 9 is
The data is read continuously from the display memory 6 a plurality of times, whereby the horizontal dot capacity of the conventional display data is converted for the dot matrix display device 2a having a different horizontal dot capacity and can be displayed.

The data of the address set in the internal register of the display conversion control unit 9 is determined in advance and stored in the ROM as described above, or can be set arbitrarily after the display device is started. Keep it.

In the twelfth (a) or (b), among the display memory data,, is output continuously,,,,
, Is transferred to the dot matrix display device interface 4a at the same cycle clock as the clock signal shown in FIG.

In the above embodiment, the conventional display data of an arbitrary address (vertical address, horizontal address) set in the internal register of the display conversion control unit 9 is stored in the display memory 6 a plurality of times, or the conventional display data is stored. An example has been shown in which a plurality of successive readings are performed from the display memory 6 to enlarge the display data capacity larger than the conventional display data capacity and to perform an enlarged display on the dot matrix display device 2a having a larger display capacity.
Conversely, the conventional display data specified by an arbitrary address (vertical address, horizontal address) of the conventional display data set in the internal register of the display conversion control unit 9 or the display address thereof is stored in the display memory 6. Thin out without storing,
Alternatively, as another method, conventional display data specified by an arbitrary address set in the internal register of the display conversion control unit 9 is not read from the display memory 6 from the display memory 6 storing the conventional display data. Then, the conventional display data capacity can be reduced, and the reduced display can be performed on the dot matrix display device 2a having a smaller display capacity than the conventional display data capacity.

An example in which the above-described method is used to display a dot matrix display device 2a having another display data capacity in consideration of the display image of the conventional display data and the viewability will be described below.

As shown in FIG. 10, there is graphic display data having a display capacity of 640 horizontal dots × 200 vertical dots and depicting a square and a perfect circle in the center of the display device screen. The ratio of the horizontal length to the vertical length of the display device screen = aspect ratio (hereinafter referred to as the aspect ratio) is 4: 3, and the aspect ratio of one dot on the screen is 1: 2.4. I do. In addition,
The aspect ratio of one dot of a pixel is uniquely determined by the aspect ratio of the screen size of the display device and the aspect ratio of the display data itself.

A case is considered where the display data shown in FIG. 10 is displayed on a dot matrix display device of 640 horizontal dots × 480 vertical dots in FIG. The screen aspect ratio of this dot matrix display device is 4: 3, and the aspect ratio of one dot of pixel is 1: 1.

The display data shown in FIG. 10 is directly stored in the above-described dot matrix display device with a display data capacity (640 dots wide × 2 dots long).
(00 dots) is shown in FIG. 11 (a).

Conventionally, as shown in FIG. 11 (a), when conventional display data displayed on a display device as shown in FIG. 10 is directly displayed on a dot matrix display device, a square becomes a rectangle and a perfect circle becomes an ellipse. turn into. This is because the aspect ratio of the display device (display device in FIG. 10) that displayed the conventional display data is different from the aspect ratio of the dot matrix display device (FIG. 11). However, this is because a graphic having a different aspect ratio is displayed on the screen of the dot matrix display device in FIG. In FIG. 11 (a), in order to make the display data screen easy to see, the conventional display data of 640 horizontal dots × 200 vertical dots is displayed at the center of the screen of the dot matrix display device, and the horizontal 640 dots at the top and bottom of the screen are displayed. A dot × 140 dots is a non-display area (border area). Next, the display conversion control unit 9 in FIG. 5 controls the display memory address generation 8 so as to double the display data of each vertical address.
Double the capacity of 0 dots x 200 dots vertically in the vertical direction, convert the display data to a capacity of 640 dots horizontal x 400 dots vertical, and display it on the above-mentioned dot matrix display device of 640 horizontal dots x 480 vertical dots. Is shown in FIG. 11 (b).

As shown in FIG. 10, the conventional display data draws a square and a perfect circle on the display device screen, but is displayed as a rectangle and an ellipse on the dot matrix display device screen of FIG. 11 (b).

In FIG. 11 (b), in order to make the display screen easier to read, display data having a capacity of 640 dots horizontally × 400 dots vertically is displayed at the center of the dot matrix imaginary screen. Dots x 40 dots are a non-display area (border area).

Next, the display conversion control unit 9 shown in FIG.
The display data at the first, third, and fifth addresses are each doubled,
The display data of the fourth address is set in a register in the display conversion control section 9 so as to triple the display data, and the conventional display data of 5 vertical addresses is controlled so as to expand the capacity to 12 vertical addresses. The capacity of 640 horizontal dots x 200 vertical dots is converted to display data of 640 horizontal x 480 vertical dots. The converted display data is converted to the horizontal 640
FIG. 11 (c) shows a state in which the image is displayed on a dot matrix display device of dot × vertical 480 dots.

As shown in FIG. 11 (c), the display device has a display capacity different from that of the conventional display data, like the conventional display data in which a square and a perfect circle are drawn on the display device screen of FIG. A square and a perfect circle are drawn on the dot matrix display device with display data obtained by converting the display capacity.

As described above, it has been shown that conventional display data can be converted (enlarged) and displayed on a dot matrix display device having a display capacity different from that of the conventional display data. That is, according to the present embodiment, the display capacity of the conventional display data is simply converted into the display capacity of the dot matrix display device and displayed, and the display capacity of the dot matrix display device is shown in FIG. In addition to eliminating the non-display area as described above, the aspect ratio of the display image of the conventional display data and the image are maintained in consideration of the aspect ratio of the conventional display data and the aspect ratio of the dot matrix display device. In addition, the conventional display data can be converted and displayed on a dot matrix display device having a different display capacity.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG.

FIG. 6 is a block diagram of a second embodiment of the present invention. The configuration of this embodiment is the same as that of the first embodiment shown in FIG. 5, except that the display conversion control unit 9 is controlled not by the display memory address generation unit 8 but by the display device interface 4a. different.

In the present embodiment, the display data of the conventional display capacity is designated and stored in the display memory 6 in accordance with the display memory address 7 generated by the display memory address generator 8, and the display data of the conventional display capacity is designated by the address. Reads display data 5 and displays dot matrix display device interface
4a, a dot matrix display signal for a dot matrix display device 2a having a display capacity different from the conventional display data capacity.
Convert to 3a. The display conversion control unit 9 performs this conversion control.

Next, the operation of converting the display data 5 of the conventional display capacity into the dot matrix display signal 3a for the dot matrix display device 2a having a display capacity different from the conventional display capacity in the display device interface 4a will be described.

The display device interface 4a converts the display memory data 5 from the display memory 6 into a dot matrix display signal 3a composed of display data and a simultaneous clock for data shift in synchronization with the data shift clock for the dot matrix display device 2a. Convert. FIG. 13 shows the display memory data 5 from the display memory 6 and the dot matrix display signal (display data) 3a output in synchronization with the shift clock.

When the display memory data,..., Are sequentially sent to the display device interface 4a, a shift clock for data shift is sent to the dot matrix display device 2a in order to display the display data as,.
As shown in Fig. 13, at the time of display memory data,
The period of the shift clock is reduced to half of that in the case of.
Thus, for example, if the display memory data of the conventional display capacity,..., Is dot display data, the dot display data is displayed on the screen of the dot matrix display device 2a by the shift clock (= dot shift clock). ,... Are expanded in the horizontal (horizontal) direction of the screen. For example, if the display memory data of the conventional display capacity,..., Is line display data, the shift clock (= line shift clock) is used for the dot matrix display device 2a. On the screen, the line data
,...,...

According to the present embodiment, as in the first embodiment, the conversion of the display capacity as shown in FIGS. 9A, 9B and 9C can be performed. Further, display capacity conversion taking into account the difference in aspect ratio as shown in FIG. 11 (c) can also be realized.

In this embodiment, the display conversion control unit 9 also has a register (or memory) for designating which display data 5 (display dot or line data) is to be converted in capacity. The period of the shift clock (dot display data shift clock, line display data shift clock, etc.) output from the interface 4a for the dot matrix display device 2a is
It is controlled to change according to the data in the internal register.

In this embodiment, the method of greatly increasing the capacity of the conventional display data and converting it to a display capacity larger than the conventional display data capacity has been described. On the contrary, the display capacity can be reduced. For example, as shown in FIG. 14, the display conversion controller 9 converts the display data 5 from the display memory 6 into the display memory data (dot display data or line display data) in the dot matrix display device interface 4a. The shift clock (dot data shift clock or line data shift clock) is controlled to shift to the dot matrix display device 2a except for the display memory data to display the display memory data. Let it. In this way, the conventional display data capacity can be converted to a small display data capacity, and can be displayed on the dot matrix display device 2a having a smaller display capacity than the conventional display data capacity.

When the shift clock to be controlled is the dot display data shift clock, the capacity is reduced in the horizontal (horizontal) direction of the display screen, and when the shift clock to be controlled is the line display data shift clock, the capacity is reduced in the vertical (vertical) direction of the display screen.

Hereinafter, a third embodiment of the present invention will be described with reference to FIG.

FIG. 15 is a block diagram showing a main part of a character display system for displaying a character (character) image on the dot matrix display device 2a.

A display memory address generator 8 generates and supplies a display memory address 7 to a display memory 6 storing conventional display data. The display memory 6 stores the display data 5 (character code) corresponding to the display address 7. Is output.
The character generator 10 stores or generates character display data, converts this display data 5 into character display data 5a, and outputs it to the display device interface 4a. The display device interface 4a converts it into a dot matrix display signal 3a, The image is displayed on the dot matrix display device 2a.

Character display data (character font data) for a dot matrix display device 2a having a screen with a display capacity different from the conventional one, instead of conventional character display data for a display device having a screen with a conventional display capacity. The character generator 10 has a function of storing or generating one or more types, and the display conversion control unit 9 controls which type of character display data 5a is output.

For example, on a screen with a display capacity of 640 x 200 dots
FIG. 17A shows one character "A" of the conventional character display data for text display of 80 characters.times.25 lines vertically. This is one-character display data having a capacity of 8 horizontal dots × 8 vertical dots, but is displayed on a dot matrix display device 2a screen having a display capacity of 640 horizontal × 400 vertical dots in the same manner as a conventional text display screen. In order to display a text of character x 25 lines vertically, as one character display data, FIG. 17 (b)
The display controller 9 controls the character generator 10 so as to output character display data having a capacity of 8 horizontal dots × 16 vertical dots as shown in FIG. As described above, the display data 5 for text display of the conventional display screen capacity is displayed on the screen of the dot matrix display device 2a having a display capacity different from the conventional display capacity on the screen of the same number of characters (horizontal character number) as the conventional text display screen. X the number of rows in the vertical direction), that is, in order to provide an easy-to-read display with the same information capacity, the display conversion control unit 9 converts the display data 5 for text display of the conventional display capacity into a dot matrix display device 2a different from the conventional display capacity. For this purpose, a control signal for producing character display data 5a having a different capacity is output to the character generator 10. The character generator 10 outputs the character display data (character font data) 5a stored or generated therein to the dot matrix display device interface 4a according to the control signal.

As described above, the character generator 10 stores or generates the character display data of the display capacity that has been agreed with the conventional display data of the character for the display capacity. For example, the display capacity of a conventional display device is 640 dots (horizontal) x 2 (vertical).
00 dots, 640 dots wide x 350 dots high, or 640 dots wide x 480 dots high, all of which display data for displaying 80 characters wide x 25 lines high on the screen, 640 dots wide x 400 dots high In order to display 80 characters horizontally and 25 lines vertically on the screen of the dot matrix display device 2a,
A character stores or generates a font having a capacity of 8 horizontal dots × 16 vertical dots. Here, when the display capacity of the dot matrix display device changes, the character generator 10 outputs a font having a capacity corresponding to the change.

As described above, the character generator 10 is configured by the ROM, and the character display data (character font data) set to be displayed on the dot matrix display device is set to one or more ROMs in the same manner as the conventional text display of the display capacity. The character conversion data is controlled by the display conversion control unit 9 or the character generator 10 is constituted by a RAM (Randam Access Memory) so that a character display data (character font data) set can be stored and set externally. By setting the character generator 10 to RAM in advance, the character conversion data (character font data) can be arbitrarily set and changed by the display conversion control unit 9. For example, the 18th
As shown in FIG. 7B, the character font "T" can be oblique.

Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.

FIG. 16 is a block diagram showing a main part of a character display system for displaying a character (character) image on the dot matrix display device 2a.

This embodiment has the same components as the embodiment of FIG. 15, but differs from the embodiment of FIG. 15 in that the display conversion control unit 9 controls the display device interface 4a instead of the character generator 10. different.

A display memory address generator 8 generates and supplies a display memory address 7 to a display memory 6 storing conventional display data, and the display memory 6 converts the display data 5 (character code) corresponding to the display address 7 into the display memory 6. Output. The character generator 10 stores or generates character display data, converts the display data 5 into character display data 5b, and outputs it to the dot matrix display device interface 4a. The dot matrix display device interface 4a converts the display data into a dot matrix display signal 3a including a synchronization signal, and causes the dot matrix display device 2a to display the dot data.

FIG. 19 shows character display data 5b from the character generator 10 and a dot matrix display signal 3a output in synchronization with the shift clock.

When the character display data is sequentially sent to the display device interface 4a in the order of ,,..., The character display data is sent to the dot matrix display device 2a.
In order to display,,,..., The shift clock for data shift is set to half the period of the shift clock at the time of character display data, as shown in FIG. Thus, for example, if the character display data of the conventional display capacity is the horizontal dot display data of one character, the character is displayed on the screen of the dot matrix display device 2a by the shift clock (= dot shift clock). The capacity of the horizontal dot display data is expanded in the horizontal (horizontal) direction of the screen, such as,,,,. For example, if the display memory data of the conventional display capacity,..., Is the line display data of the display screen of the conventional display capacity, the shift clock (= screen line shift clock) causes the display on the screen of the dot matrix display device 2a. , Line display data, ,,,,, ..., vertical screen (vertical)
The capacity is increased in the direction.

The above operation has a register (or memory) for designating which character display data 5b (display dot or line data) is to be converted in capacity inside the display conversion control section 9, and the dot matrix display interface 4a The period of the shift clock (dot display data shift clock, line display data shift clock, etc.) output for the dot matrix display device 2a from
The data in this internal register is controlled to change accordingly.

In the above embodiment, the method of greatly increasing the capacity of the conventional display data and converting it to a display capacity larger than the conventional display data capacity has been described. On the contrary, the display capacity can be reduced. . For example, the display conversion control unit 9
The dot matrix display interface 4a
In FIG. 20, the display data 5a from the character generator 10 is replaced with the character display data (dot display data or line display data) as shown in FIG.
By shifting the shift clock (dot data shift clock or line data shift clock), the character display data is shifted to the dot matrix display device 2a to display the character display data. . In this way,
The display data capacity can be converted into a smaller display data capacity of the conventional display data capacity, and can be displayed on the dot matrix display device 2a having a smaller display capacity than the conventional display data capacity.

When the shift clock to be controlled is the dot display data shift clock, the capacity is reduced in the horizontal (horizontal) direction of the display screen, and when the shift clock to be controlled is the line display data shift clock, the capacity is reduced in the vertical (vertical) direction of the display screen.

Next, FIGS. 21 and 22 show the fifth and sixth embodiments in which the dot matrix display device 2a in the first and second embodiments of FIGS. 5 and 6 is replaced with a CRT display device 2b. FIG. With the change of the display device, the display device interface is also changed from 4a to 4b.

The CRT display interface 4b converts the display data 5 of the conventional display capacity into a CRT display signal 3b for the CRT display 2b having a display capacity different from the conventional display capacity.
This method will be described below.

The CRT display device interface 4b synchronizes the display memory data 5 from the display memory 6 with the data shift clock for the CRT display device 2b, and converts the display data into a CRT display signal 3b including a synchronization clock such as horizontal synchronization or vertical synchronization. Convert. FIG. 26 shows a typical CRT display signal 3b. FIG. 25 shows the display memory data from the display memory 6 and the CRT display signal 3b based on the shift clock.

When the display memory data,..., Are sequentially sent to the CRT display device interface 4b, the CRT display device 2
In order to display the display data as b,...,..., the shift clock for data shift is set to 1 / Assume 2. Thereby, for example, the conventional display capacity display memory data,.
... is the dot display data, the shift clock (=
With the dot shift clock) and the buffer, the dot display data is displayed on the screen of the CRT display device 2b as:
The capacity is expanded in the horizontal (horizontal) direction of the screen.
For example, display memory data of the conventional display capacity,
,... Are line display data, the line display data is displayed on the screen of the CRT display device 2b by the shift clock (= line shift clock) and the buffer.
The capacity is expanded in the vertical direction of the screen. Here, the line display data is doubled. In addition, FIG. 9 (a) shows an example in which each of the seven line display data is doubled, and FIG. FIG. 9C shows an example in which the first, second and fourth line display data are doubled, and FIG. 9C shows an example in which the sixth line display data is doubled out of the seven line display data. Thus, for example, according to the method of FIG.
The display data of the dot capacity can be displayed on a CRT display device 2b having a display capacity of 640 (horizontal) x 400 (vertical) dots by converting the display capacity at the CRT display interface 4b. Similarly, FIG. 9), the conventional display data of 640 × 200 dots is converted into the display data of 640 × 350 dots by the method of FIG. 9 (c).
Display data with a capacity of 640 x 350 dots, 640 x 400
The display capacity is converted into display data of the dot capacity by the CRT display device interface 4b.

Note that the above difference is determined by the display conversion control unit 9 as to which display data 5 (display dot,
Or a register (or memory) that specifies whether to convert the capacity of the line data) and the shift clock (dot display data shift clock, line display data shift clock, etc.) output from the CRT display interface 4b for the CRT display 2b. ) Is controlled so as to be changed by the data in the internal register.

Also in this embodiment, not only the enlargement but also the reduction can be performed by the same method as described above, and depending on whether the shift clock to be controlled is the dot display data shift clock or the line display data shift clock, the display screen width ( The capacity can be reduced in the horizontal (horizontal) direction or the capacity can be reduced in the vertical (vertical) direction of the display screen.

The conversion of the display data capacity in consideration of the aspect ratio can be performed in the same manner as described above.

Next, FIGS. 23 and 24 show the seventh embodiment of the present invention, respectively.
And a block diagram of an eighth embodiment.

The seventh and eighth embodiments correspond to the dot matrix display devices of the third and fourth embodiments described with reference to FIG. 15 and FIG.
2a is changed to a CRT display device 2b, and the display device interface 4a is changed to 4b.

The operation of both embodiments is the same as the third and fourth embodiments, respectively.

For example, in the embodiment of FIG. 8, as shown in FIG.
The display memory (character) display data 5b from the character generator 10 is converted into display data by a shift clock and a buffer, and as shown in FIG. 26, a dot matrix display signal comprising display data and a synchronization signal (horizontal and vertical synchronization). Output as 3b.

In the seventh and eighth embodiments, as in the other embodiments, the display data capacity can be converted in consideration of the aspect ratio.

 Hereinafter, a ninth embodiment of the present invention will be described.

When display data with a display device of the conventional display capacity is contrasted and displayed on a display device having a different display capacity and a display capacity different from that of the conventional display capacity, the display data of the display device with the conventional display capacity has the same or close to the aspect ratio of the display data on the screen. A display device different from the conventional display capacity in consideration of the aspect ratio will be described.

FIG. 27 is a diagram in which a square and a perfect circle are displayed by display data on a display device screen having a display capacity of 640 horizontal dots × 200 vertical dots. The display device has an aspect ratio of a screen (4: 3) and a dot (1: 2.4). Now, this display data is converted into the display capacity, the display capacity is doubled in the screen vertical (vertical) direction, and the display device screen of the display capacity of 640 (horizontal) × 400 (vertical) dots to be displayed is shown in FIG. Show. The display device shown in FIG. 28 converts the display data of the conventional display capacity shown in FIG. 27 in advance to display capacity conversion (in this case, twice in the vertical direction) and displays the data. The aspect ratio of the display device is set to a screen (4: 3) and a dot (1: 1.2) so that the aspect ratio of the figure based on the data becomes the same. As a result, as shown in FIGS. 27 and 28, the display on the display device screen becomes a square and a perfect circle, and has the same aspect ratio and is easy to see.

In this embodiment, the display device in which the display capacity is expanded in the vertical (vertical) direction is described. However, the display capacity is expanded in the horizontal (horizontal) direction, and conversely, the display device is expanded in the vertical (vertical) and horizontal (horizontal) directions. The same applies to a display device having a display capacity whose display capacity is reduced in the direction. That is, when the display data of the conventional display capacity is converted and displayed, the display aspect ratio on the display device screen of the conventional display capacity is the same (or approximate).
Thus, the aspect ratio of the display device may be considered.

[Effects of the Invention] According to the present invention, display data of another display device having an arbitrary display capacity different from the display capacity of a display device of a certain type, for example, a dot matrix display device, is displayed. By the conversion, display can be performed so that a non-display portion does not occur. In addition, since the magnification can be changed at any magnification in the vertical and horizontal directions, the display capacity can be converted in consideration of the aspect ratio so as to prevent image distortion.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a display system according to the present invention,
FIG. 2 is a block diagram of a conventional display system, FIGS. 3 and 4 are explanatory diagrams of a conventional display data double raster output method and a display data line spacing enlargement method, respectively, and FIG. 5 is a first embodiment of the present invention. FIG. 6 is a block diagram of the second embodiment of the present invention, FIGS. 7 and 8 are explanatory diagrams of the number of lines multiplied by an integer multiple, and FIG. 10 and 11 are explanatory diagrams of display capacity multiplication, FIGS. 12 to 14 are explanatory diagrams of the operation of the display system of FIG. 6, and FIG. 15 is a diagram of a third embodiment of the present invention. Block diagram, No. 16
FIG. 17 is a block diagram of a fourth embodiment of the present invention, and FIGS. 17 to 20 are explanatory diagrams of the operation of the display system of FIGS.
FIG. 21 is a block diagram of a fifth embodiment of the present invention, FIG. 22 is a block diagram of a sixth embodiment of the present invention, FIG. 23 is a block diagram of a seventh embodiment of the present invention, and FIG. 25 and 26 are explanatory diagrams of the operation of the display system of FIG. 24, and FIGS. 27 and 28 are explanatory diagrams of a ninth embodiment of the present invention. 1: display circuit, 2: display device, 3: display signal, 4: display device interface, 5: display data, 6: display memory, 7: display memory address, 8: display memory address generator, 9: display conversion control Department.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Onuma 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video Engineering Co., Ltd. (72) Inventor Nobuo Tsuchiya 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi Video Engineering (72) Inventor Seiwa Nishioka 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Microelectronics Device Development Laboratory, Hitachi, Ltd. (72) Inventor Terumi Takashi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Co., Ltd. In Hitachi, Ltd. Microelectronics Equipment Development Laboratory (72) Inventor Masahiro Landowner 292, Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video Engineering Co., Ltd. (56) References JP-A-63-127288 (JP, A) 61-214879 (J JP-A-61-214878 (JP, A) JP-A-60-192479 (JP, A) JP-A-60-74771 (JP, A) JP-A-60-60686 (JP, A) 58-50589 (JP, A) JP-A-63-58497 (JP, A) JP-A-62-19897 (JP, A) JP-A-62-92995 (JP, A) JP-A-61-248082 (JP, A A)

Claims (2)

(57) [Claims] 1. Each of the images stored in a display memory.
Using a plurality of display data representing the display contents of dots, an image having a number of dots M (M is an integer that is not an integral multiple of N) greater than the number N of dots on each line of the image is input. A display capacity converter for sequentially displaying each display data at the timing of a data clock pulse for inputting the display data, and displaying the data on a display device displaying one dot with the display content represented by the display data captured by one data clock pulse; From the memory, during one horizontal display period, one of the images
Means for sequentially reading out N display data representing the display contents of N dots forming a line at regular intervals and outputting the display data to the display device; and at least a part of the display data is output to the display device. The number of data clock pulses output during each period is different from the number of data clock pulses output during each period when each of the other part of the display data is output to the display device, and one horizontal M data clock pulses are output during one horizontal display period so that the total number of data clock pulses output during the display period is M, and each of display data is output to the display device. Means for outputting to the display device during each period. 2. A display memory which stores a plurality of display data representing an image in which the number of dots in each line is N, each display data representing a display content of one dot of the image. A display device that sequentially captures data at the timing of a data clock pulse for inputting data and displays one dot with display content represented by display data captured by one data clock pulse, and a plurality of display data stored in the display memory. If the number of dots in each line is M (where M is greater than N and N
A display capacity conversion device that causes the display device to display an image that is an integer that is not an integral multiple of the display memory, and wherein the display capacity conversion device reads one of the images from the display memory during one horizontal display period.
Means for sequentially reading N display data representing the display contents of N dots forming a line at regular intervals and outputting the display data to the display device; and at least a portion of each of the display data is output to the display device. The number of data clock pulses output during each period is different from the number of data clock pulses output during each period when some other display data is being output to the display device, and M data clock pulses are output during one horizontal display period so that the total number of data clock pulses output during the horizontal display period is M, and each of display data is output to the display device. Means for outputting to the display device during each period.