JPH0527728A - Device and method for image display control - Google Patents

Abstract

PURPOSE:To write row control data and row control addresses in a storage area in common to other display data, to integrate a circuit device, and to reduce its production cost with respect to the device which controls a display of characters and symbols on a display unit, etc. CONSTITUTION:This controller is equipped with at least a 1st control means 1 which controls the writing and reading of 1st data D1 regarding the image display and 2nd data D2 regarding row units on a display screen, a storage means 12 stored with the 1st data D1 and 2nd data D2, and a 2nd control means 13 which performs output control over the 1st data D1 and 2nd data D2; and the 2nd data D2 are written in the storage area of the storage means 11 in front of and behind the 1st data D1 in one unit row on the display screen.

Description

Detailed Description of the Invention

[Table of Contents] Industrial applications Conventional technology (Fig. 5) Problems to be Solved by the Invention Means for Solving the Problems (FIG. 1) Action Example (FIGS. 2-4) The invention's effect

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display control apparatus and an image display control method, and more particularly to an apparatus and a display control method for displaying a screen of characters or symbols on a display or the like. is there.

In recent years, in the field of image processing such as computer graphics, video, and television, an image display control device for displaying a screen of characters or symbols during an arbitrary screen display has been used depending on the mode of use of a user, and it is integrated. A semiconductor integrated circuit device that has been realized is manufactured.

According to this, in addition to the storage device for storing display data such as characters and symbols, line control data and line control addresses for controlling the display screen line by line are written in the peripheral circuits. . Further, the data is selectively output by the selector circuit based on the vertical control signal.

Therefore, when the amount of data handled for screen display increases due to demands for diversification of image display characters and improvement of the function of the device, the peripheral circuits have to be increased, and incidental thereto. Therefore, the scale of the selector circuit is inevitably increased.

Therefore, the row control data and the row control address are shared and written in the memory area of other display data, and the writing / reading method is devised to achieve the integration of the circuit device, and the production cost thereof. There is a need for an apparatus and method that can reduce the cost.

[0007]

2. Description of the Related Art FIG. 5 is a block diagram of an image display control device according to a conventional example. For example, an image display control device for displaying characters or symbols on a display or the like in units of lines or units of characters includes a write control circuit 1, a RAM (a memory that can be written / read at any time) 2, a horizontal counter 3, and a vertical counter in FIG. 4, a selector circuit 5, a D-type latch circuit 6, a data latch circuit 7, a character generator 8 and an output control circuit 9.

The function of the device is that the character data D1 and the character address ADD1 for displaying the screen of characters and symbols on the display or the like are written in the RAM 2 through the write control circuit 1 in advance. Further, row control data D2 and row control address ADD2 for controlling the display screen row by row are written in the D-type latch circuit 6.

When characters or symbols are displayed line by line or character by character on a display or the like, R based on each control signal output from the horizontal counter 3 or the vertical counter 4.
Character data D1 from AM2 to the data latch circuit 7
The character address ADD1 is read. Further, based on the character address ADD1 and the like, character display data is output from the character generator 8 to the display or the like via the output control circuit 9.

At this time, row control data D2 is output from the D-type latch circuit 6 to the output control circuit 9 for each row of the display screen, and the data D2 is based on the vertical control signal VS output from the vertical counter 4. Are selectively output by the selector circuit 5.

As a result, image display control is performed in which characters or symbols are changed line by line or character by line on the display or the like, for example, the display color is changed line by line or character by line, and the display color is inverted.

[0012]

By the way, according to the conventional example, the line control data D for controlling the display screen line by line.
2 and the row control address ADD2 are written in the D-type latch circuit 6. The data D2 is selectively output by the selector circuit 5 based on the vertical control signal VS.

For this reason, when the amount of handled data relating to screen display increases due to a demand for diversification of image display characters and improvement of the function of the device according to the usage mode of the user, the line control data D2 and the line control address ADD2 are changed. There is no choice but to increase the number of D-type latch circuits 6 to be written. Further, accompanying this, the scale of the selector circuit 5 for selecting the row control data D2 for each row of the display screen is inevitably increased.

As a result, when the device is integrated on one semiconductor chip, the ratio of the D-type latch circuit 6 and the selector circuit 5 to the chip area increases more and more, which hinders the integration of the semiconductor integrated circuit device. However, there is a problem in that it hinders the reduction of the production cost.

The present invention was created in view of the problems of the conventional example, and row control data and a row control address are shared and written in the storage area of other display data, and a reading method thereof is devised. , To integrate the circuit device,
Another object of the present invention is to provide an image display control device and an image display control method capable of reducing the production cost thereof.

[0016]

FIG. 1 shows a principle diagram of an image display control apparatus and an image display control method according to the present invention.

As shown in FIG. 1, the image display control device of the present invention includes at least the first data D1 relating to image display.
And writing of the second data D2 relating to line control of the display screen /
First control means 11 for controlling reading and storage means 12 for storing the first data D1 and the second data D2.
And a second control means 13 for controlling the output of the first data D1 and the second data D2, the first data relating to one unit row of the display screen in the storage area of the storage means 12. The second data D2 is written before and after D1.

In the image display control device, the first data D1 and the second data D2 are sequentially read out in synchronization with a horizontal synchronizing signal HSYNC for image display.

Further, the image display control method of the present invention is a method for controlling the screen display on a line-by-line basis or on a character-by-character basis. The first data D1 on the image display and the second data on the line control on the display screen are provided. When performing the writing process of D2, at least
Second data D for controlling the row of the display screen before and after the storage area of the first data D1 related to one unit row of the display screen
2 is performed to read the first data D1 that has been subjected to the writing process and the second data D2 that has been subjected to the writing process before and after the storage area of the first data D1. Achieve the purpose.

[0020]

[Operation] According to the image display control device of the present invention, as shown in FIG. 1, the first control means 11, the storage means 12, and the second control means 11 are provided.
The control means 13 is provided and the second data D2 is written in the storage area of the storage means 12 before and after the first data D1 related to one unit row of the display screen.

For example, the first data D1 relating to image display
And the second data D2 relating to the row control of the display screen is controlled to be written in the storage means 12 via the first control means 11.
At this time, the second data D2 is written in the storage area of the storage means 12 before and after the storage area of the first data D1 related to one unit row of the display screen.

When character display processing is performed on a display device or the like, the first data D1 relating to image display from the storage means 12 via the second control means 13 and the second data relating to line control of the display screen. The data D2 of is read. At this time, the first
Data D1 and second data D2 are sequentially read out in synchronization with the horizontal synchronizing signal HSYNC for image display.

Therefore, even when the amount of handled data relating to the screen display is increased, the writing / reading function of the first and second data D1 and D2 as in the conventional example is ensured,
A peripheral circuit such as a D-type latch circuit for writing the second data D2 is omitted, and a selector circuit for selecting the second data D2 for each row unit of the display screen, which is required accompanying the peripheral circuit. Is unnecessary.

As a result, the semiconductor integrated circuit device can be integrated more than the conventional example, and the production cost thereof can be reduced. Further, according to the image display control method of the present invention, when writing the first data D1 related to image display and the second data D2 related to line control of the display screen, a unit line of the display screen is displayed. Before and after the storage area of the first data D1, the writing process of the second data D2 for controlling the row of the display screen is performed.

Therefore, when the character display process is performed on the display device or the like, the first data D1 previously written and the second data written before and after the storage area of the first data D1 are written. The second data D2 is selected for each line unit of the display screen as in the conventional example by performing the reading process of D2 sequentially, for example, in synchronization with the horizontal synchronizing signal HSYNC relating to the image display. The simplification can be achieved as compared with the reading process.

As a result, it becomes possible to sufficiently meet the demands of the user's usage mode such as diversification of image display characters and improvement of the function of the device. Further, since the size reduction of the image display control device is improved, it is possible to reduce the size of the portable image processing device.

[0027]

Embodiments of the present invention will now be described with reference to the drawings. 2 to 4 are diagrams for explaining the image display control device and the image display control method according to the embodiment of the present invention, and FIG. 2 is a configuration diagram of the image display control device according to the embodiment of the present invention, and FIG. Shows respective operation time charts at the time of reading the data.

For example, an image display control device for displaying characters or symbols on a display or the like in line units or character units is shown in FIG.
In the data write / read control block 21, R
It comprises an AM (writable / readable memory) 22 and a data output control block 23.

That is, the data write / read control block 21 is an embodiment of the first control means 11 and comprises a selector circuit 21A, a data write control circuit 21B, a horizontal counter 21C and a vertical counter 21D. Selector circuit 21
A is for input selection of the first data D1 relating to image display and the second data D2 relating to row control of the display screen. The selector circuit 21A is the selector circuit 5 of the conventional example.
Unlike the chip occupancy area, the chip occupancy area is about one tenth.

Here, the first data D1 includes character data D1 as a character code and its character address ADD1. The second data D2 is line control data D for controlling the display screen on a line-by-line basis.
2 and the row control address ADD2 are included.

The data write control circuit 21B controls the data write of the character data D1, the character address ADD1, the row control data D2 and the row control address ADD2.

The horizontal counter 21C counts horizontal synchronizing pulses based on a horizontal synchronizing signal HSYNC which is a reference signal for reading a character code. The vertical counter 21D counts vertical synchronizing pulses that define a display period of characters or symbols on one line (one line) of a display screen such as a display.

The RAM 22 is an embodiment of the storage means 12, and includes the character data D1 and the character address ADD1.
And row control data D2 and row control address ADD2. The line control data D2 is, for example, written in the memory area of the RAM 22 in the rear part of the memory area of the character data D1 related to one unit row of the display screen (see FIG. 4).

The data output control block 23 is an embodiment of the second control means 13 and comprises a row control register 23A, a data latch circuit 23B, a character generator 23C and an output control circuit 23D. The row control register 23A temporarily stores the row control data D2 while the character data D1 relating to one unit row of the display screen is generated. Note that the row control register 23A is about several tenths of the area occupied by the chip of the D-type latch circuit 6 of the conventional example.

The data latch circuit 23B temporarily latches the character data D1, and the character generator 23C outputs image display data D11 and D12 such as characters and symbols based on the character data D1 to the output control circuit 23D.
Is output to.

The output control circuit 23D controls the output of the image display data D11 and D12 based on the row control data D2. For example, the display color of characters or symbols is changed line by line or character by line on a display or the like, and the display color is inverted.

As described above, the image display control apparatus according to the embodiment of the present invention is provided with the data write / read control block 21, the RAM 22 and the data output control block 23 as shown in FIG. Data D1 for one unit line of the display screen in the memory area of
The row control data D2 is written in the rear part of the memory area.

For example, the character data D1, the character address ADD1, the line control data D2, and the line control address ADD2 are previously written in the data write / read control block 2.
R via the selector circuit 21A of 1 and the write control circuit 21B
Written in AM22.

At this time, the RAM 22 is used in the embodiment of the present invention.
Character data D of the display screen in the memory area of
For each unit row of 1, row control data D2 is stored at the rear of the memory area.

When performing character display processing on a display device or the like, the data latch circuit of the data output control block 23 is synchronized with the horizontal synchronizing signal HSYNC as shown in the operation time chart at the time of data reading in FIG. The character data D1 is sequentially read from the RAM 22 via the character generator 23B and the character generator 23C. Further, the row control data D2 is read out via the row control register 23A. At this time, in FIG. 3, the row control data D2 [1a] and the character data D1 [2a, 3a ...] Are sequentially read out in synchronization with the rising edge of the horizontal synchronizing signal HSYNC.

Therefore, even when the amount of handled data relating to the screen display is increased, the writing / reading function of the character data D1, the character address ADD1, the line control data D2 and the line control address ADD2 as in the conventional example is performed. The D-type latch circuit 6 for writing the row control data D2 can be omitted while securing the row control data D2, and the row control data D2 for each row unit of the display screen, which is required in association therewith, can be omitted.
The selector circuit 5 for selecting is unnecessary. With this,
When the device is integrated on one semiconductor chip, it is possible to avoid the state in which the D-type latch circuit 6 and the selector circuit 5 occupy a large chip area as in the conventional example.

As a result, by slightly increasing the capacity of the RAM 22 and installing the row control register 23A, it becomes possible to integrate the semiconductor integrated circuit device as compared with the conventional example, and to reduce the production cost thereof. It is possible to plan.

Next, an image display control method according to the embodiment of the present invention will be described while supplementing the operation of the apparatus. FIG. 4 is an explanatory diagram of an image display control method according to the embodiment of the present invention, which shows the relationship between the memory area of the RAMM and the display screen of the display.

For example, when the screen display of a display or the like is controlled on a line-by-line basis or on a character-by-character basis, the character data D1 and the character address ADD1 etc. relating to the display of the 1st to nth lines on one screen are previously stored, .. and the row control data D21 relating to the row control of the first row are written.

At this time, line control of the display screen is performed at the rear of the memory area of the character code relating to the screen display of one unit line, that is, the line where the display format can be changed for each unit line. The control data D21 is written. Here, when the character code relating to the image display of one unit row is written in the selector circuit 21A, the input is selected, and the row control data D21 relating to the row control of the display screen is data at the rear part of the memory area. It is written by the write control circuit 21B.

As a result, the character data D1, the character address ADD1 and the line control data D21 are stored from the RAM 22. In the memory area of the RAM 22, the line control data D21 is written in the rear part of the character data D1 for one unit line of the display screen (see FIG. 4).

Next, the written character code, ... And the line control data D21 written in the rear portion of the memory area of the character code, ... Are read out. At this time, the horizontal synchronizing pulse based on the horizontal synchronizing signal HSYNC, which is the reference signal for reading the character code, is counted by the horizontal counter 21C. Also a vertical counter
In 21D, the vertical synchronizing pulse that defines the display period of the characters and symbols related to one line (one line) of the display screen such as a display is counted.

As a result, the row control data D21 is first read from the RAM 22 to the row control register 23A, and is temporarily stored during the period in which the character code relating to one unit row of the display screen is generated. It

On the other hand, the data latch circuit 23B temporarily latches the character code, ... Read from the RAM 22 following the row control data D21. Further, based on the character code, ... In the character generator 23C, image display data D11 and D12 such as characters and symbols are displayed.
Is output to the output control circuit 23D.

As a result, the output control circuit 23D outputs the image display data D11 or D12 to a display or the like, and the characters or symbols are displayed or controlled on a line-by-line or character-by-character basis based on the line control data D21. For example, the display color is changed or the display color is inverted.

In this way, according to the image display control method according to the embodiment of the present invention, the character code relating to the image display, ... Or the line control data D relating to the line control of the display screen.
When the writing process of 21 is performed, the writing process of the line control data D21 for controlling the line of the display screen is performed at the rear part of the memory area of the character code related to one unit line of the display screen.

For this reason, when character display processing is performed on a display or the like, the character code previously written, ... Or the line control data D21 written in the rear portion of the memory area of the character code, is written first. , For example, in synchronization with the horizontal synchronizing signal HSYNC relating to the image display,
By performing the reading process, it is possible to simplify the reading process as compared with the reading process in which the row control data D21 is selected for each line unit of the display screen as in the conventional example.

As a result, it becomes possible to sufficiently meet the demands of the user's usage mode such as diversification of image display characters and improvement of the function of the apparatus. Further, since the size reduction of the image display control device is improved, it is possible to reduce the size of the portable image processing device.

[0054]

As described above, according to the image display control device of the present invention, the first and second control means and the storage means are provided, and the storage area of the storage means has one unit line of the display screen. The second data related to the row control of the display screen is written before and after the first data.

Therefore, even when the amount of data handled for screen display is increased, the semiconductor integrated circuit device can be integrated while ensuring the first and second data write / read functions as in the conventional example. It becomes possible to reduce the production cost.

Further, according to the image display control method of the present invention, when writing the first data relating to the image display and the second data relating to the line control of the display screen, one unit line of the display screen is written. Before and after the storage area of the first data related to the above, the writing processing of the second data for controlling the row of the display screen is performed.

Therefore, when the character display processing is performed on the display device or the like, the first data which has been previously written and the second data which has been written before and after the storage area of the first data are sequentially written. By performing the reading process in synchronization with the horizontal synchronizing signal or the like, the simplification can be achieved as compared with the conventional example.

As a result, it becomes possible to sufficiently cope with diversification of image display characters and improvement of the function of the device. In addition, it greatly contributes to downsizing of portable image processing devices such as computers, videos and televisions.

[Brief description of drawings]

FIG. 1 is a principle diagram of an image display control device and an image display control method according to the present invention.

FIG. 2 is a configuration diagram of an image display control device according to an embodiment of the present invention.

FIG. 3 is an operation time chart at the time of reading data of the image display control device according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram of an image display control method according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of an image display control device according to a conventional example.

[Explanation of symbols] 11, 13, ... First and second control means, 13 ... storage means, D1, D2 ... First and second data.

Claims (3)

[Claims] 1. At least first data (D1) relating to image display and second data (D) relating to row control of a display screen.
2) First control means (1) for controlling writing / reading
1) and the first data (D1) and the second data (D
Storage means (12) for storing 2) and a second means for controlling output of the first data (D1) and the second data (D2)
And a control means (13) for storing the storage means (12).
The image display control device, wherein the second data (D2) is written before and after the first data (D1) relating to one unit row of the display screen in the storage area. 2. The image display control device according to claim 1, wherein the first data (D1) and the second data (D1).
2) is an image display control device which is sequentially read out in synchronization with a horizontal synchronizing signal (HSYNC) relating to image display. 3. A method for controlling screen display in units of lines or characters, and writing processing of first data (D1) related to image display and second data (D2) related to line control of a display screen. When performing, at least before and after the storage area of the first data (D1) related to one unit row of the display screen, write processing of the second data (D2) for row control of the display screen, An image display characterized by performing read processing of the written first data (D1) and the second written data (D2) before and after the storage area of the first data (D1). Control method.