JP2002351450A - Method and device for image display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate such a defect that memory capacity increases since display data in a deforming process need to be all stored in a memory to smoothly display and erase a character on a display device. SOLUTION: The image display in provided with a step for displaying a character from the memory on the display device, a step for generating an arbitrary pattern at coordinates on the display device, and a step for superposing the arbitrary pattern on the character from the memory.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an image display method and an image display device, and more particularly to an image display method and an image display device for displaying data on a display device such as a CRT.

[0002]

2. Description of the Related Art In recent years, an on-screen display function for displaying various information such as a channel and volume on a television set or the like has been developed based on control data stored in a memory such as a RAM. 2. Description of the Related Art An image display device that reads stored display data and performs display on a display device such as a CRT is used.

FIG. 4 is a block diagram of a conventional image display device. In FIG. 4, a conventional image display device 4 is shown.
Reference numeral 00 denotes a data decoding circuit 102, a data reading circuit 103, and a display circuit 107.

[0004] 101 is a RAM, S101 is a RAM101
, CRT display control data stored in the data decoding circuit 102 for decoding the control data S101;
102 is a display code indicating the type of display classified from the control data S101, 103 is a data read circuit for reading the display code S102, S103 is a display data address for the display code S102 output from the data read circuit 102, 104 is a ROM, S104 is ROM
The display data specified by the display data address S103 stored in 104 is 107, and the display data 107 is S10.
A display circuit for generating a signal to be displayed on the CRT based on
107 is an RGB signal to be displayed on the CRT, 108 is a CRT
It is.

The operation of the conventional image display device configured as described above will be described. First, the RAM 101
Control data S for displaying on a CRT stored in
101 is read out to the data decode circuit 102, and the data decode circuit 102 decodes the control data S101 to generate a display code S102. Display code S102
Includes the display position, contents, and the like, and is read by the data read circuit 103. The data read circuit 103 generates a display data address S103 based on the display code S102 and inputs the display data address S103 to the ROM 104. R
The OM 104 stores character and image data required for screen display. The data stored at the address specified by the display data address S103 is the display data S.
It is output as 104. The display circuit 107 reads out the display data S104 and converts it into an RGB signal S107 for screen display. The RGB signal S107 is a CRT
The image is input to the CRT 108, and pictures and characters are displayed on the CRT 108.

[0006]

However, in the above-described conventional configuration, when it is desired to display a certain picture or character gradually on a screen by an arbitrary dot or to perform smooth display by erasing the picture or character from the screen, it is necessary to use a movie film. Display data of the appearance and erasure process as one frame one by one RO
M104 must be stored in the ROM 104
Has the drawback that the capacity of the device increases.

FIG. 5 shows an RO required when a picture or a character is displayed on the screen at an arbitrary dot or erased from the screen.
This shows an example of the data of M, and the character “A” is changed to (b),
This shows a case where the display is performed in five stages of (c), (d), (e), and (f). Conventionally, the character "A" is represented by (b), (c), (d),
When displaying in five stages (e) and (f), the ROM 1
04 includes not only character data (a) but also character data (b),
It is necessary to store (c), (d), (e), and (f). In general, when a certain picture or character is displayed or deleted in n stages, n pictures of ROM are required for one picture or character.

The present invention has been made to solve such a problem, and eliminates the need to store all display data in the process of appearance and disappearance of characters and images in a ROM.
It is an object of the present invention to provide an image display method and an image display device capable of realizing a smooth screen display without increasing the capacity.

[0009]

According to a first aspect of the present invention, there is provided an image display method comprising: reading character data stored in a memory into a control circuit; Generates deformed pattern data for gradually appearing or erasing a data pattern, reads out the deformed pattern data to the control circuit, and superimposes the deformed pattern data on the character data by the control circuit to generate deformed display data. Then, a display for gradually appearing or erasing the character data is performed.

This eliminates the need to store all display data in the process of appearance or disappearance of characters in the ROM.
Smooth character display can be performed without increasing the capacity of M.

According to a second aspect of the present invention, there is provided the image display method according to the first aspect, wherein the pattern data displayed on the display device is not only character data but also character data.
It is assumed to be arbitrary visual information.

This eliminates the need to store all display data in the process of appearance and disappearance of an image in the ROM.
A smooth image display can be performed without increasing the capacity of M.

According to a third aspect of the present invention, there is provided an image display device, comprising: a memory for storing a plurality of character data; a means for generating deformed pattern data for causing a pattern of the character data to gradually appear or gradually disappear; And a control circuit for generating deformed display data by superimposing the deformed pattern data on the character data to perform display for gradually displaying or gradually deleting characters on the display device.

This eliminates the need to store all the display data of the character appearance and disappearance processes in the ROM.
Smooth character display can be performed without increasing the capacity of M.

According to a fourth aspect of the present invention, in the image display apparatus according to the third aspect, pattern data displayed on the display device is arbitrary visual information in addition to character data. It is something that was taken.

This eliminates the need to store all display data in the process of appearance or disappearance of an image in the ROM.
Smooth image display can be performed without increasing the M capacity.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a block diagram of an image display device and an image display method according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 100 denotes an image display device according to the present invention; 101, a RAM;
, Control data for display on a CRT stored in the RAM 101; 102, a data decode circuit for decoding the control data S101; S102, control data S101
The display code 103 indicates the type of display classified from the following. 103 is a data reading circuit for reading the display code S102, S
103, a display data address for the display code S102 output from the data read circuit 103;
Is a ROM, S113 is character transformation start data included in the display code S102, and 105 is character transformation start data S
A display / erase pattern generation circuit which operates when the data 113 is loaded; S104, display data designated by a display data address S103 stored in the ROM 104;
S105 is the pattern data output from the display / erase pattern generation circuit 105, 106 is a control circuit that performs character deformation using the display data S104 and the pattern data S105, S106 is display data that is character deformed by the control circuit 106, and 107 is display. Based on the data S106, C
A display circuit for generating a signal to be displayed on the RT;
An RGB signal to be displayed on the RT, 108 is a CRT.

Image display device 100 according to the first embodiment
Is the character transformation start data S113 from the data reading circuit 103 in addition to the configuration of the conventional image display device of FIG.
And a display / erase pattern generation circuit 105 for generating a display / erase pattern S105 in response to the display / erase pattern generation circuit 1
And a control circuit 106 for generating display data for deforming characters by superimposing the pattern data S105 from the image data 05 on the display unit. It creates data for the process of showing and erasing.

The operation of the image display method in the image display device configured as described above will be described below.
First, the display control data S101 stored in the RAM 101 is read out to the data decode circuit 102, and the control data S101 is decoded to generate a display code S102. The display code S102 is read by the data read circuit 103, and a display data address S103 is generated based on the display code S102 and input to the ROM 104. On the other hand, the character transformation start data S
113, the data read circuit 103
Extracts the character transformation start data S113 and inputs it to the display / erase pattern generation circuit 105. The character transformation start data S113 includes information on how many steps the characters and pictures stored in the ROM 104 are to be displayed or erased, or what algorithm is to be used for displaying or erasing. Display / erase pattern generation circuit 105
Starts the operation when the character transformation start data S113 is fetched, and outputs the pattern data S105. Specified by the display data address S103, the ROM 104
Is stored in the control circuit 106, and the display data S104 is created by superimposing the pattern data S105 on the display data S104. Display data S106
Is input to the display circuit 107, and then the RGB signal S10
7 and output to the CRT 108.

According to the image display apparatus according to the first embodiment as described above, the display data taken out of the ROM can be changed one after another by the pattern data, so that only one display data is stored in the ROM. so,
Characters and pictures can be displayed and erased smoothly without increasing the capacity of the ROM.

Embodiment 2 FIG. The image display device and the image display method according to the second embodiment show the configuration and operation of the control circuit 106 in the image display device and the image display method according to the first embodiment.

FIG. 2 is a block diagram showing a control circuit in the image display device and the image display method according to the second embodiment of the present invention. 2, reference numeral 200 denotes a control circuit according to the second embodiment, 104 denotes a ROM, and S201 denotes a ROM 10
4, a data bus for outputting the display data S104 stored in the buffer 4, a buffer 201 for temporarily storing the display data S104, a buffer display data from the ROM 104 temporarily stored in the buffer 201, and a display / erase pattern generation 105. S105 is the pattern data output from the display / erase pattern generation circuit 105;
02 is pattern data S105 and buffer display data S
A display data change circuit for superimposing 202 with S202;
Is a display data transformed by the display data transformation circuit 202, and 107 is a display circuit for generating a signal to be displayed on the CRT based on the display data S106.

The operation of the image display method in the image display apparatus according to the second embodiment configured as described above will be described below. First, the display data S104 stored in the ROM 104 is temporarily stored in the buffer 201 via the data bus S201. The buffer display data S202 stored in the buffer 201 is the display data transformation circuit 2
02. Further, the pattern data S105 generated by the display / erase pattern generation circuit 105 is input to the display data transformation circuit 202, and the buffer display data S202 and the pattern data S105 are overlapped by the display data transformation circuit 202 to form the transformed display data S10.
6 is generated. The modified display data S106 is the display circuit 1
07.

According to the image display apparatus of the second embodiment as described above, the process of appearance and deletion of characters and images can be displayed by creating pattern data without increasing the capacity of the ROM. Smooth characters and images can be displayed simply by storing two pieces of display data.

Embodiment 3 The image display method according to the third embodiment shows an example using the deformed display data when a picture or a character is displayed on the screen by an arbitrary dot as shown in FIG. 5 or is erased from the screen. .

FIG. 3 shows an example in which the character "A" is deleted in five steps (b), (c), (d), (e) and (f) in the image display method according to the third embodiment. Show. In FIG. 3, (a) shows the ROM 104
The display data (a) is displayed on the CRT. When the conversion start data S113 is input to the display / erase pattern generation circuit 105, the pattern data S105 is output to the control circuit 106. The pattern data S105 is represented by a hatched square in FIG. The display data (a) shows (b), (c), (d),
The display area of the hatched square is increased in the order of (e) and (f). The pattern data S105 is the data (a) from the ROM 104.
, And the character “A” is gradually erased. The data stored in the ROM 104 is a digital value of “0” or “1”. In FIGS. 3 and 5, the black square is “1”, the white square is “0”, and the hatched square is “1”. 5, (b), (c), (d), (e), and (f) of FIG.
They correspond to (b), (c), (d), (e), and (f).

FIG. 6 shows an example of superposition of data by a simple logic circuit in the image display method according to the third embodiment. (a) 601 is a display / erase pattern generation circuit 10;
5, the upper four rows of the pattern data S105 output from 5, the 602 of (a) represent the upper four rows of the data stored in the ROM 104, and the 603 of (a) represents the upper four rows of the display data S106. (A) 601, 602, 60
It is assumed that a black square 3 represents a digital value “1” and a white square represents a digital value “0”. S601 of (b) represents the first and second rows of the data 601 shown in (a) as waveforms from the left, and S602 of (b) represents the first and second rows of the data 602 shown in (a). The second line is represented by a waveform from the left, and (b)
In step S603, the first and second rows of the data 603 shown in (a) are represented by waveforms from the left. (b) S603 is a signal that is the basis of data displayed on the CRT 108;
This signal is obtained by superimposing the pattern data S105 on the data from the ROM 104. This waveform can be generated from S601 in (b) and S602 in (b) by using a simple logic circuit as indicated by 600 in (c). it can. As described above, according to the image display method of the third embodiment, the modified display data output from the control circuit includes the pattern data output from the display / erase pattern generation circuit and the display data output from the ROM. Based on the above, it can be created by using a simple logic circuit, and by using the above pattern data,
Smooth display and deletion of characters and pictures equivalent to a state where all display data in the process of display and deletion are stored in the ROM can be realized.

[0028]

As described above, according to the image display method of the first aspect of the present invention, the character data stored in the memory is read out to the control circuit, while the character data pattern gradually appears. Alternatively, deformed pattern data to be gradually erased is created, the deformed pattern data is read out to the control circuit, and the control circuit superimposes the deformed pattern data on the character data, generates deformed display data, and generates the deformed display data. Since the display that gradually appears or is gradually erased is performed, there is an effect that characters can be smoothly displayed or erased without increasing the capacity of the ROM.

According to the image display method of the present invention, in the image display method of the first aspect, the pattern data to be displayed on the display device may be any visual information other than character data. Therefore, there is an effect that an image can be smoothly displayed or erased without increasing the capacity of the ROM.

Further, according to the image display device of the present invention, there is provided a memory for storing a plurality of character data, a means for generating deformed pattern data for causing the pattern of the character data to gradually appear or to be erased, By superimposing the deformation pattern data on the character data,
A control circuit for generating deformed display data is provided, and characters on the display device are displayed or erased gradually, so that characters can be displayed or erased smoothly without increasing the capacity of the ROM. effective.

According to the image display device of the fourth aspect of the present invention, in the image display device of the third aspect, the pattern data displayed on the display device may be any visual information other than character data. Therefore, there is an effect that an image can be smoothly displayed or deleted without increasing the capacity of the ROM.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an image display device and an image display method according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a control circuit in an image display device and an image display method according to a second embodiment of the present invention.

FIG. 3 is a diagram showing an example of a display in an image display method according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a conventional image display device and image display method.

FIG. 5 is a diagram showing an example of display in a conventional image display method.

FIG. 6 is a diagram showing an example of superposition of data using a simple logic circuit in the image display method according to the third embodiment of the present invention.

[Explanation of symbols]

Reference Signs List 100 image display device 101 RAM 102 data decode circuit 103 data read circuit 104 ROM 105 display / erase pattern generation circuit 106 control circuit 107 display circuit 108 CRT 200 control circuit 201 buffer 202 display data transformation circuit 400 in second embodiment Conventional image display device 600 Logic circuit S101 Control data S102 Display code S103 Display data address S104 Display data specified by data address S103 S105 Pattern data S106 Display data obtained by superimposing pattern data on character data S107 RGB signal S113 Character transformation start Data S201 Data bus S202 Buffer display data

Claims (4)

[Claims] 1. A character data stored in a memory is read out to a control circuit. On the other hand, deformed pattern data for causing a pattern of the character data to gradually appear or be erased is created, and the deformed pattern data is read out to the control circuit. An image display method, wherein the control circuit superimposes the deformed pattern data on the character data to generate deformed display data, and performs display in which the character data gradually appears or gradually disappears. 2. The image display method according to claim 1, wherein the pattern data to be displayed on the display device is arbitrary visual information in addition to the character data. 3. A memory for storing a plurality of character data, means for generating deformed pattern data for gradually appearing or erasing a pattern of the character data, and a method for superimposing the deformed pattern data on the character data. An image display device, comprising: a control circuit for generating display data; and performing display for gradually displaying or gradually deleting characters on the display device. 4. The image display device according to claim 3, wherein the pattern data displayed on the display device is arbitrary visual information in addition to the character data.