JPH0746478A - Picture display device - Google Patents

Abstract

PURPOSE:To save a storage capacity of a character memory by providing an area storing information designating a frame added to a character to a display memory designating the displayed character. CONSTITUTION:A display memory 2 stores information designating a frame added to a character simultaneously with character designation information sent from an input circuit 1. A 4-bit area, for example is provided to each character information for storing frame information and each bit is made corresponding to four sides of a frame. In the case of displaying the character, the character designation information from the display memory 2 is fed to a character memory 3 and frame information therefrom is fed to a pattern generating circuit 12. A synthesis circuit 6 synthesizes a font pattern of the character and frame generated by the character memory 3 and the pattern generating circuit 12 and gives the result to an output circuit 8 as a dot pattern.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for displaying characters on a display such as a television receiver and a video reproducing device.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram of a conventional image display device. In the figure, 1 is an input circuit. The input circuit 1 determines whether the content input from the outside is address designation data or character designation data, and if it is address designation data, it is given to the address control circuit 5, and the address control circuit 5 stores this data. On the other hand, in the case of character designation data, this data is written to the address of the display memory 2 (made of RAM) designated by the address stored in the address control circuit 5. The character designating data stored in the display memory 2 is used to designate a font pattern of one character from the font patterns of a plurality of characters stored in the character memory 3 including the ROM.

The timing generating circuit 7 generates a dot clock synchronized with a horizontal synchronizing signal and a vertical synchronizing signal input from the outside. In the case of reading from the display memory 2, the address control circuit 5 uses the timing generation circuit 7
The address of the display memory 2 is designated in synchronization with the dot clock generated, and the display memory 2 gives the character designation data to the character memory 3. The select circuit 4 selects parallel data for one horizontal line of the character font pattern in synchronization with the dot clock generated by the timing generation circuit 7, and the shift circuit 9 converts the parallel data into serial data.

In FIG. 9, the character "A" is taken as an example, the select circuit 4 selects the parallel data on the ninth line of the font pattern of the character "A" stored in the character memory 3, and the shift circuit 9 selects the parallel data. The process of converting to serial data is shown. The output circuit 8 converts the serial data given by the shift circuit 9 into a character image signal suitable for a display (not shown) and outputs it to the display. Since it is possible to read the display memory 2 and the character memory 3 for one clock, when the empty time occurs and the character designating data is input from the outside as described above, this empty time is required for writing to the display memory 2. use. That is, writing and reading of data to and from the display memory 2 are performed in a time division manner.

FIG. 10 shows a display example of an image for displaying a table including characters by using such a device. As one method of performing such display, a combination of characters and characters stored in the character memory 3 is combined and displayed at a necessary place. For example, FIG. 11 shows that there are 16 types of one character “A” including a character with one side of the frame on the right and a character with two sides of the frame on the top and the right, including no frame. , For all other characters, 16 patterns are required.

[0006]

In such a conventional image display device, the storage capacity of the character memory 3 is required to be 16 times as large as that in the case of displaying only characters, and the storage capacity of the display memory 2 is also the character with pattern. There is a problem in that it is necessary to add 4 bits to specify. The present invention has been made in view of this problem,
To reduce the storage capacity of the character memory by storing specific information in the display memory, converting the specific information into a specific pattern (Waku in the above example), and displaying a character with a specific pattern. A first object of the present invention is to provide an image display device capable of performing the above.

Further, a part of the specific information is stored in the display memory, a part of the specific information is converted into a specific pattern, and a ruled line corresponding to the remaining specific pattern is generated to add a specific pattern. A second object is to provide an image display device capable of reducing the storage capacity of the display memory and the character memory by displaying the character.

Further, there is provided an image display device in which various kinds of specific patterns are stored in a ROM and by displaying the characters having specific patterns, it is possible to display various kinds of specific patterned characters. The third
The purpose of. Furthermore, by storing various types of specific patterns in RAM and displaying specific types of characters, it is possible to register multiple types of specific patterns and display multiple types of specific patterned characters. A fourth object is to provide a display device.

[0009]

In the image display device according to the first invention, the display memory has an area for storing specific information for each data designating the character, and the pattern generating circuit has the specific information. It is characterized in that a specific pattern is generated from the information, and the synthesizing circuit synthesizes the font pattern of the character and the specific pattern.

In the image display device according to the second aspect of the invention, the display memory has an area for storing specific information for each data designating the character, and the pattern generating circuit generates a specific pattern from the specific information. Generated, a synthesizing circuit generates a character with a specific pattern by synthesizing the font pattern of the character and the specific pattern, generating a specific ruled line to be displayed at a position where the ruled line generating circuit displays the character, It is characterized in that it is configured to display the specific ruled line and the specific patterned character.

In the image display device according to the third aspect of the invention, the pattern memory including the ROM stores a specific pattern,
The display memory stores data for designating a specific pattern stored in the pattern memory, and a synthesizing circuit synthesizes the font pattern of the character and the specific pattern.

An image display device according to a fourth aspect of the present invention stores a specific pattern in a pattern memory including a RAM, and the display memory stores data designating the specific pattern stored in the pattern memory, The synthesizing circuit is configured to synthesize the font pattern of the character and the specific pattern.

[0013]

According to the first aspect of the invention, the area for storing the specific information is provided to the display memory for each character designating data, and the pattern generating circuit generates a specific pattern from the specific information and synthesizes the specific pattern. Since the circuit is configured to synthesize the font pattern of the character and the specific pattern, it is possible to display the table including the characters by generating the waku as the pattern from the information of the side of the waku.

In the second aspect of the invention, the area for storing the specific information is provided to the display memory for each character designating data, and the pattern generating circuit generates a specific pattern from the specific information and synthesizes the specific pattern. The circuit generates a character with a specific pattern by synthesizing a font pattern of the character and a specific pattern, and the ruled line generation circuit outputs the ruled line and the character with the specific pattern. It is possible to display a table including characters by combining the frame generated as a pattern with the ruled line.

According to the third aspect of the invention, the pattern memory comprising the ROM stores various kinds of specific patterns, and the composition circuit is adapted to combine the character font pattern and the specific pattern. It is possible to display many kinds of specific patterned characters by using a lot of line-type patterns as patterns.

According to the fourth aspect of the present invention, since a large number of specific patterns are stored in the pattern memory composed of RAM and the synthesizing circuit synthesizes the character font pattern and the specific pattern, a large number of patterns are stored in the pattern memory. It is possible to write a wack pattern of the line type, register various types of specific patterns by using this wack pattern, and display many types of characters with specific patterns.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 1 is a block diagram showing an embodiment of an image display device according to the first invention. The input circuit 1 judges whether the content input from the outside is address designation data or character designation data, and if it is address designation data, it is given to the address control circuit 5, and the address control circuit 5 stores this data. On the other hand, if the data is character designation data, this data is written to the address of the display memory (made of RAM) 2 designated by the address stored in the address control circuit 5. The display memory 2 is provided with an area for four more bits for each character designating data, and in this area, work information given simultaneously with the character designating data from the input circuit 1 is stored.

For example, as shown in FIG. 2, when "1" is stored in the most significant bit of this 4-bit work information,
This means outputting the work data for displaying the lower one of the four sides of the work. Next, as shown in FIG. 2, the other 3 bits out of the 4 bits sequentially correspond to the right, upper and left sides from the least significant bit. The character designating data stored in the display memory 2 is used to designate a font pattern of one character from the font patterns of a plurality of characters stored in the character memory 3 including the ROM. The timing generating circuit 7 generates a dot clock in synchronization with a horizontal synchronizing signal and a vertical synchronizing signal input from the outside.

When reading from the display memory 2, the address control circuit 5 designates the address of the display memory 2 in synchronization with this dot clock, and the display memory 2 gives the character designation data to the character memory 3. Four
The bit work information is given to the pattern generation circuit 12. The character memory 3 supplies the font pattern of the designated character to the selection circuit 4, and the selection circuit 4 synchronizes the horizontal data of one line in the horizontal direction of the character font pattern in synchronization with the dot clock corresponding to the position to be displayed. select.

Further, the pattern generation circuit 12 generates work data from the above 4-bit work information in synchronization with the dot clock corresponding to the position to be displayed, and supplies this work data to the synthesis circuit 6. The synthesizing circuit 6 synthesizes the character font pattern and the work data in synchronization with the dot clock. FIG. 2 shows a font pattern of the character "A" stored in the character memory 3 and a font pattern of a character with a blank which is a combination of the font pattern of the character "A" and the blank data generated by the pattern generation circuit 12.

In the example shown in FIG. 2, "1" is stored in all the bits, so that four sides of the frame are displayed. In this embodiment, when “1” is stored in each bit of the area for storing the vacuum information of the display memory 2, the vacuum data is generated and each bit of the area for storing the vacuum information of the display memory 2 is generated. If "0" is stored in, the work data is not generated, but conversely, "0" is set in each bit of the area for storing the work information of the display memory 2.
Is stored, the work data is generated, and when “1” is stored in each bit of the area for storing the work information of the display memory 2, the work data may not be generated. In this way, it is possible to display a table including a plurality of characters as shown in FIG. 10 by writing the work information in the necessary area of the display memory 2 in order to display the work at the necessary place. Becomes

FIG. 3 is a block diagram showing an embodiment of the image display device according to the second invention. In the figure, 2 is a display memory. In the display memory 2, an area for 2 more bits is provided for each character designating data, and in this area, work information simultaneously given with the character designating data from the input circuit 1 is provided. Remember. For example, when "1" is stored in the upper bit of this 2-bit work information, it means that the work data for displaying the right side of the four sides of the work is output, and the lower bit is the lower one. Corresponds to the edge. Further, the pattern generation circuit 12 generates work data from the above 2-bit work information in synchronization with the dot clock corresponding to the position where the character is to be displayed, and the composition circuit 6 combines this work data and the character font pattern. , Generates a font pattern for the character with the waku.

Only the information stored in the display memory 2 can display only the right and lower sides of the frame. Therefore, it is possible to display a table including a plurality of characters by displaying ruled lines corresponding to the left and upper sides of the frame. Next, the display of the ruled lines will be described.

FIG. 10 is a display example of a table including a plurality of characters. The ruled line generation circuit 13 receives the dot clock generated by the timing generation circuit 7 and displays the ruled lines rightward and downward from the display start position which is the intersection of the uppermost line and the leftmost ruled line as shown in this example. Is. A display start position, which is an intersection of the top line and the leftmost ruled line, is given to the ruled line generation circuit 13 by an appropriate means, and the timing of this display start position is determined by using a value counted using a dot clock and a horizontal synchronizing signal. It can be obtained by
Similarly, the display end positions of the top line and the leftmost ruled line can be obtained. For a table including a plurality of characters, a ruled line generated by the ruled line generation circuit 13 from this display start position and a font pattern of a character with a watermark output by the shift circuit 9 are given to the output circuit 8, and the ruled line and the work pattern are displayed from the display start position described above. It is created by outputting the font pattern of the attached character to a display not shown.

On the other hand, since the 2-bit work information stores the work data of the lower and right sides, for example, the work data of the upper side of the portion where "X" is displayed in the table of FIG. It can be displayed as the work data of the lower side of the blank displayed in the upper position where "X" is displayed, and the work data of the left side of the part where "Y" is displayed in the table is this " It can be displayed as the work data on the right side of the blank displayed at the left position where "Y" is displayed.

In addition, in FIG. 4, the 2-bit work information stored in the display memory 2 is associated with the lower and right sides, but other combinations include the upper and right sides, the upper and left sides, and the lower side. There are 3 ways on the left side. In this case, the ruled line generating circuit 13 described above generates signals to be displayed at the bottom row and the left end, the bottom row and the right end, the top row and the left end, and the top row and the right end. The configuration of FIG. 3 is the same as the configuration of FIG. 1 except for the above configuration, and corresponding parts are designated by the same reference numerals and description thereof is omitted. As described above, according to the present embodiment, the work information stored in the display memory 2 is 2 bits for each character designation data.
There is an advantage that the storage capacity of the display memory 2 can be smaller than that of the embodiment of the invention.

FIG. 5 is a block diagram showing an embodiment of the image display device according to the third invention. In the figure, 10 is a pattern memory. The pattern memory 10, which is a ROM, stores a plurality of font patterns for frames. In addition to the solid line shown in FIG. 11, the pattern memory 10 stores a font pattern of a number of line types such as a broken line and a dashed line. The wax designating data stored in the display memory 2 is an address of the pattern memory 10 for designating a font pattern of one wax from a plurality of font patterns of the wax. The specified font pattern of the frame is given to the synthesizing circuit 6.

The display memory 2 is provided with a plurality of bit areas corresponding to the stored number for storing the character designating data for each character designating data, and the character designating data stored in the display memory 2 is stored in the ROM. The font pattern of one character is designated from the font patterns of a plurality of characters stored in the character memory 3 consisting of and is given to the synthesizing circuit 6. The configuration of FIG. 5 is the same as the configuration of FIG. 1 except for the above configuration, and corresponding parts are designated by the same reference numerals and description thereof is omitted.

Next, the operation at the time of reading will be described.
In the case of reading from the display memory 2, the address control circuit 5 designates the address of the display memory 2 in synchronization with the dot clock corresponding to the position where the character is to be displayed, and the display memory 2 uses the character designation data as the character designation data. Give it to the memory 3, specify the font pattern of the character,
The font pattern of this character is given to the synthesis circuit 6. At the same time, the display memory 2 supplies the work specifying data to the pattern memory 10, specifies the work font pattern, and also supplies the work font pattern to the synthesis circuit 6. The synthesizing circuit 6 synthesizes the font pattern of these characters and the font pattern of the frame to generate the font pattern of the character with the frame, and supplies the font pattern of the character with the frame to the selecting circuit 4.

FIG. 6 shows the font pattern of the character "A" stored in the character memory 3, the frame data stored in the pattern memory 10 and the font pattern of the character with a frame in which the combination circuit 6 combines these data. And indicates. The select circuit 4 selects one line of parallel data in the horizontal direction of the font pattern of the character with a frame in synchronization with the dot clock corresponding to the position where the character is to be displayed. As described above, according to this embodiment, since the font patterns of a lot of line types are stored, it is possible to display a lot of line type characters with a mark.

FIG. 7 is a block diagram showing an embodiment of the image display device according to the fourth invention. The pattern memory 10 in the third embodiment of the present invention uses the ROM, but the pattern memory 11 of the present embodiment uses the RAM. Therefore, the address control circuit 5 can generate the font pattern of the line type desired by the user. Pattern memory specified by the address stored in
Write to address 11. The configuration of the embodiment of the fourth invention of FIG. 7 is the same as the configuration of the embodiment of the third invention of FIG. 5 except the above configuration, and the corresponding parts are designated by the same reference numerals and the description thereof will be omitted.

Next, the write and read operations will be described. The input circuit 1 judges whether the content inputted from the outside is address designation data, character designation data or a font pattern, and if it is address designation data, it is given to the address control circuit 5, and if it is character designation data. Writes this data to the address of the display memory 2 designated by the address stored in the address control circuit 5. On the other hand, if the font pattern is a blank font pattern, this data is written to the address of the pattern memory 11 designated by the address stored in the address control circuit 5.

In the case of reading from the display memory 2, the address control circuit 5 specifies the address of the display memory 2 in synchronization with the dot clock corresponding to the position where the character is to be displayed, and the display memory 2 specifies the character. The data is given to the character memory 3, the font pattern of the character is designated, and the font pattern of this character is given to the synthesizing circuit 6. Further, the display memory 2 supplies the work specifying data to the pattern memory 11, specifies the work font pattern, and also supplies the work font pattern to the synthesis circuit 6. The synthesizing circuit 6 synthesizes the above-mentioned character font pattern and the waku font pattern to generate a wok character font pattern, and supplies this wok character font pattern to the selecting circuit 4.

FIG. 6 shows a font pattern of the character "A" stored in the character memory 3, a font pattern of a frame stored in the pattern memory 11, and a character with a frame in which the composition circuit 6 combines these data. And the font pattern of. The select circuit 4 selects one line of parallel data in the horizontal direction of the font pattern of the character with a frame in synchronization with the dot clock corresponding to the position where the character is to be displayed.

As described above, in the present embodiment, since the font patterns of a large number of different line types are written in the pattern memory 11, the line types desired by the user can be used. As described above, the font patterns of all the frames described above are displayed on a part of the sides of the frame, but it is also possible to display any pattern other than the frame.

[0036]

As described above, in the image display device according to the first aspect of the present invention, the display memory is provided with an area of 4 bits each for each character designating data, and the work information is stored in this area. Therefore, the storage capacity of the character memory can be reduced and the semiconductor integrated circuit can be downsized as compared with the case of displaying a table including characters in the conventional circuit.

In the image display device according to the second invention,
An area for 2 more bits is provided for each character designating data in the display memory, and the work information is stored in this area. The storage capacities of the memory and the character memory can be reduced, and the semiconductor integrated circuit can be reduced in size.

Further, in the image display device according to the third invention,
Since the font patterns of a large number of line types are stored in the character memory, it is possible to display a large number of line type characters with a frame. Furthermore, in the image display device according to the fourth aspect of the present invention, since the font patterns of a large number of line types are stored in the character memory, it is possible to utilize the line types desired by the user. .

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an image display device according to the first invention.

FIG. 2 is an explanatory diagram of an operation in which a synthesis circuit of the device of the present invention shown in FIG. 1 synthesizes a font pattern of a character.

FIG. 3 is a block diagram showing an embodiment of an image display device according to the second invention.

FIG. 4 is an explanatory diagram of an operation in which the synthesis circuit of the device of the present invention shown in FIG. 3 synthesizes a font pattern of a character.

FIG. 5 is a block diagram showing an embodiment of an image display device according to the third invention.

FIG. 6 is an explanatory diagram of an operation in which the synthesis circuit of the device of the present invention shown in FIGS. 5 and 7 synthesizes a font pattern of a character.

FIG. 7 is a block diagram showing an embodiment of an image display device according to the fourth invention.

FIG. 8 is a block diagram of a conventional image display device.

FIG. 9 is an explanatory diagram of the operation of the select circuit.

FIG. 10 is a schematic view of an example of an image display device.

FIG. 11 is a schematic diagram of a character with a waku about the character “A” in the conventional image display device.

[Explanation of symbols]

 1 Input Circuit 2 Display Memory 3 Character Memory 4 Select Circuit 5 Address Control Circuit 6 Compositing Circuit 7 Timing Generation Circuit 8 Output Circuit 9 Shift Circuit 10 Pattern Memory 11 Pattern Memory 12 Pattern Generation Circuit 13 Ruled Line Generation Circuit

Claims (4)

[Claims] 1. An image display device, comprising: a character memory storing a font pattern of a character; and a display memory storing data designating a character to be displayed by reading from the character memory. Has a region for storing specific information for each data designating the character, and synthesizes a font pattern of the character and the specific pattern with a pattern generation circuit for generating a specific pattern from the specific information. An image display device comprising: a synthesizing circuit. 2. An image display device comprising: a character memory storing a font pattern of a character; and a display memory storing data designating a character to be displayed by reading from the character memory. Has a region for storing specific information for each data designating the character, and synthesizes a font pattern of the character and the specific pattern with a pattern generation circuit for generating a specific pattern from the specific information. A combination circuit, a combined specific patterned character, and a ruled line generation circuit that generates a specific ruled line to be displayed at a position for displaying the character, and displays the specific ruled line and the specific patterned character An image display device characterized in that the image display device is configured to perform the above. 3. An image display device comprising a character memory in which a font pattern of a character is stored and a display memory for storing data designating a character to be displayed by reading from the character memory. A pattern memory composed of a stored ROM, the display memory for storing data designating a specific pattern stored in the pattern memory, and a combination for combining the font pattern of the character and the specific pattern. An image display device comprising: a circuit. 4. An image display device comprising a character memory storing a character font pattern, and a display memory storing data designating a character to be displayed by reading from the character memory. Pattern memory consisting of RAM to store,
An image display device, comprising: the display memory for storing data designating a specific pattern to be stored in the pattern memory; and a synthesizing circuit for synthesizing the font pattern of the character and the specific pattern. .