JP3474906B2 - On-screen display device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-screen display device for expanding and displaying display information such as character information and graphic information on a screen of a television, a video or the like, and more particularly to a simple moving image such as a cursor. The present invention relates to an on-screen display device capable of on-screen display.

[0002]

2. Description of the Related Art Generally, an on-screen IC is used when various kinds of display information are to be displayed on-screen on a screen such as a television or a video. In the on-screen IC, the character generator ROM and the video R
On-screen display of display information is performed using two types of image memories of AM. That is, when the display information is character information, the character generator ROM is determined by the character code stored in the video RAM.
The character pattern to be displayed on-screen is read out from the character patterns stored in the memory, converted into image data, and output as a signal to a predetermined position on the screen.

On the other hand, when the graphic information is displayed on the screen of a personal computer or the like, the graphic information is treated as an aggregate of pixels and the individual pixels are expanded and displayed on the screen. In this case, the above character generator ROM is not used, and the video RA
Graphic pattern information is stored in M as a bit map graphic together with color information.

Further, the inventors of the present invention have filed Japanese Patent Application No. 5-2691.
At 78, an on-screen display device that enables coloring in pixel units without increasing the capacity of the video RAM and that enables graphic information to be displayed on-screen with rich expressivity by a simple circuit configuration is proposed. is doing. By the way, in the image displayed on screen,
It may be convenient to superimpose another image. Figure 8
[Fig. 3] is a schematic diagram showing a screen display example in which a simple moving image is further superimposed and displayed on an image displayed on-screen on a television screen. In this example, an image showing the Japanese archipelago is displayed as a sketch on the television screen, and further, the letters "VTR" are superimposed on the sketch and four display operation keys for image feed (in the figure, the lower horizontal direction of the television screen is displayed). Direction, from left to right,
Frame advance key, stop key, fast forward key, fast rewind key 4
(Showing one operation key) is displayed on-screen. Further, in order to select any one of the four display operation keys and turn on the key, a “cursor mark” as a simple moving image is displayed on the screen so as to be superimposed on the image of the display operation key.

As described above, in order to realize the dual on-screen display, it is necessary to provide at least the following two functions as the on-screen display device. One is that it is possible to control the display position on a pixel-by-pixel basis rather than the display position control on a character-by-character basis such as rows and columns in order to realize a simple moving image such as a cursor that moves freely on the on-screen screen. The other is that double on-screen display is possible for the image that is already displayed as a sketch.

[0006]

However, in the conventional on-screen display device of the character display system and the on-screen display device disclosed in the above-mentioned Japanese Patent Application No. 5-269178, the control of the display position of various display information is not possible. Since it is performed in units of characters in rows and columns, it is not possible to realize an on-screen display in which two or more characters are displayed in an overlapping manner. That is, on-screen display of a simple moving image such as a cursor as shown in FIG. 8 cannot be realized. As a possible method, prepare a large number of graphic patterns and character patterns in which the image of the simple moving image such as the cursor and the image to be displayed on the normal screen overlap according to the display position of the simple moving image such as the cursor, and move the simple moving image. There is a method of switching and displaying them according to. However, in such a method, it is necessary to prepare a large number of patterns, and the graphic pattern ROM and the character generator R that are inevitably used.
It would be an exaggeration to say that this would result in a large increase in the capacity of the OM, and that it would be practically impossible to achieve in the end.

On the other hand, if the graphic display system adopted in a personal computer or the like is used, the display position can be controlled on a pixel-by-pixel basis. It is possible to realize a dual on-screen display by calculating the value in (1) and writing it in the graphic RAM. That is, the display of the cursor or the like as shown in FIG. 8 can be easily realized. However, the graphic display system itself requires a very expensive large-capacity video RAM, a high-speed CPU, and the like, so that there is a problem that the device cost is considerably high.

The present invention has been made to solve such a problem, and by controlling the display position of the display information in pixel units on the on-screen screen, the on-screen display of a simple moving image such as a cursor is inexpensive. It is an object of the present invention to provide an on-screen display device that can be realized by.

[0009]

In order to achieve the above object, an on-screen display device according to the invention of claim 1 develops display information such as character information and graphic information on an on-screen screen. An on-screen display device capable of lean display, which is further superimposed and displayed on the display information displayed on-screen,
Moreover, the moving picture information storage means for storing moving picture information that can be moved on the on-screen screen as fixed pattern information, and the predetermined pattern information to be displayed in the fixed pattern information stored by the moving picture information storage means. Moving picture pattern code storage means for storing code information for specifying a moving picture pattern, moving picture information display position deciding means for deciding a display position of the designated moving picture pattern on the on-screen screen, and the moving picture information display position deciding means in accordance with the information of the display position determined by, and a video information display control means for controlling so as to further the moving image information to be superimposed on the display information on-screen display is displayed, before
The moving picture pattern code storage means is a moving picture pattern to be stored.
Code to multiple on-screen screens horizontally
It is characterized in that it is stored for each divided row .

Further, according the on-screen display device in the invention of the claims 2, an on-screen display device of the first aspect, before SL video information display position determining means, the on-screen display of the row, Alternatively, it is characterized in that a predetermined rectangular area extending over at least two or more rows is determined as the display position of the moving image pattern to be displayed.

An on-screen display device according to a third aspect of the present invention is the on-screen display device according to the second aspect , wherein the moving image information display position determining means determines the display position of the rectangular area. , The horizontal direction address indicating the display start position of the moving image pattern on the on-screen screen and the vertical line address in the row, and by rewriting both addresses, the moving image information is displayed in pixel units on the on-screen screen. The feature is that it can move freely.

An on-screen display device according to a fourth aspect of the present invention is the on-screen display device according to the third aspect , wherein the moving image information display control means displays the moving image information during a horizontal blanking period. After reading the information on the display position determined by the position determining means, and further reading the moving image pattern code stored by the moving image pattern code storage means, during the on-screen display period following the horizontal blanking period,
The feature is that the moving image information is controlled to be displayed on screen.

The on-screen display device according to the invention of claim 5 is the on-screen display device according to claim 4 , wherein the moving picture information display control means further displays moving picture information in the rectangular area. It is characterized by comprising a judging means for judging whether or not to display the background image of at least in pixel units.

[0014]

According to the above structure, in the present on-screen display device, display information such as character information and graphic information is expanded and displayed on the on-screen screen.
The movable moving image information is displayed on the screen in superimposition on the display information. In this case, the moving picture information storage unit stores the moving picture information as fixed pattern information. Further, code information for designating a predetermined moving image pattern to be displayed in the stored fixed pattern information is stored by the moving image pattern code storage means.

Next, the display position of the designated moving image pattern on the on-screen screen is determined by the moving image information display position determining means. Then, according to the information on the determined display position, the moving image information display control means controls so that the moving image information is further superimposed and displayed on the display information which is already displayed on-screen. on the other hand,
In the moving picture pattern code storage means, the moving picture pattern code is stored in units of each line obtained by horizontally dividing the on-screen screen into a plurality of pieces. Further, the moving image information display position determining means determines a predetermined rectangular area within a line on the on-screen screen or across at least two lines as the display position of the moving image pattern to be displayed.

In this case, the display position of the rectangular area is determined by
It is performed by the horizontal address indicating the display start position of the moving image pattern on the on-screen screen and the vertical address in the row. Further, by rewriting those addresses, the moving image information displayed on the on-screen screen can be freely moved in the screen on a pixel-by-pixel basis.

Further, in the moving picture information display control means, the information regarding the display position of the moving picture information is read within the horizontal blanking period, the moving picture pattern code is read subsequently, and further the horizontal blanking period is continued. The video information is controlled to be displayed on-screen during the on-screen display period. Further, in this case, the moving image information display control unit determines whether or not to display the background image of the moving image information displayed in the rectangular area by the determining unit at least in pixel units.

As a result of the above, the character information and the graphic information expanded and displayed on the on-screen screen are
The moving image information is further superimposed and displayed on the screen. The moving image information is controlled so that it can be moved freely on the on-screen screen. It is also possible to display the background image of the moving image information in the rectangular area where the moving image information is positioned.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic diagram showing a relative positional relationship between a simple moving image display surface displayed on an on-screen display device according to the present invention and a TV display surface. As shown in the figure, in the present on-screen display device, a TV display surface on which a normal video signal is displayed is used as an image display surface on a TV screen, and an on-screen still image is superimposed on the TV display surface. It is to be noted that superimposing an external signal on a video signal is called superimpose.) A conventional on-screen display surface for displaying and a simple moving image such as a cursor are further superimposed on the on-screen display surface and displayed. There are at least one or more types of display screens of the simple moving image display surface (here, for simplicity, one of the simple moving image display surfaces is displayed). Then, the respective images displayed on these three types of display surfaces form a superimposed image as if they were displayed with a certain distance visually.

FIG. 2 is a block diagram showing the basic circuit configuration of the on-screen display device according to the present invention. This on-screen display device includes a CPU 1 and a video RA.
M2, a graphic pattern ROM 3, a graphic pattern switch 4, a color conversion table 5, a display control circuit 6, and a screen read address generation circuit 7 for generating a read address of a screen graphic pattern code for the video RAM 2. A basic circuit required for normal on-screen display, a simple moving picture read address generating circuit 8 for generating an address for accessing the simple moving picture table 21 in the video RAM 2, and switching of individual addresses supplied to the video RAM 2. Address changeover switch 9, simple moving picture line address conversion circuit 10, line address changeover switch 11, simple moving picture vertical display start position holding register 12, and simple moving picture horizontal display start position holding register 13
And a simple moving image horizontal display start position control circuit 14, a simple moving image graphic pattern holding shift register 15, and each circuit required for on-screen display of a simple moving image such as a cursor of the display color detection circuit 16. ing.

The graphic pattern ROM 3 stores graphic information to be displayed on the screen of a television, a video, etc. as graphic pattern data having color information. Information about a simple moving image such as a cursor is also stored as simple moving image pattern data having color information. In the video RAM2,
A screen graphic pattern code serving as a read address for the graphic pattern data stored in the graphic pattern ROM 3 and data (described later) defining a simple moving image are stored.

Next, the circuit operation for on-screen display of graphic information and simple moving image information according to the above-mentioned circuit configuration will be described. The CPU 1 outputs the CPU data by designating an address to the video RAM 2, and controls writing and reading of the graphic pattern code. At the same time, it controls writing of data to the simple moving image definition table 21 and reading of data therefrom.

Further, the screen read address generation circuit 7 supplies an address for reading the graphic pattern code to the video RAM 2 through the address changeover switch 9 in accordance with the final screen refresh. At the same time, the line address for reading the simple moving image pattern is supplied to the graphic pattern ROM 3 via the simple moving image line address conversion circuit 10 and the line address changeover switch 11.

In the simple moving image line address conversion circuit 10, when changing the display position of a simple moving image such as a cursor on the simple moving image display surface, after converting the line addresses of the constituent pixels, the line address changeover switch 11 is used. , The read line address of the simple moving image pattern is supplied to the graphic pattern ROM 3. Further, the simple moving image read address generation circuit 8 supplies an address for reading the data of the simple moving image table 21 to the video RAM 2 via the address changeover switch 9 in synchronization with the simple moving image display synchronization signal. There is.

Here, the simple moving image table 21 will be described. FIG. 3 is a simplified moving image definition table 21 shown in FIG.
It is a block diagram which shows the structure of. Simple video definition table 21
Defines the display start position on the simple moving image display surface shown in FIG. 1 and the display pattern (graphic pattern) of the simple moving image. Then, as shown in FIG. 2, the simple moving image definition table 21 is provided in a part of the video RAM 2 holding the screen graphic pattern code. This is because the memory device used as the video RAM 2 usually has an address space of 2 N power, whereas the row / column in the case of on-screen display usually has a configuration of 2 N power. This is because there is a free area that is not used in the video RAM 2 and can be used as the simple moving image definition table 21. Like this, video R
New RAM by using the free area of AM2
Is not necessary at all, and as a result, the on-screen display device which is the object of the present invention can be constructed at low cost. Of course, another RAM may be prepared for the simple moving image table 21.

As shown in the figure, the simple moving image definition table 21 is composed of the same line as a unit which is superimposed on the on-screen display surface shown in FIG. 1, and at least the simple moving image in which pixels are formed in the line is formed. The vertical display start position, the horizontal display start position, and the graphic pattern code indicating the pattern of the simple moving image such as the cursor mark are defined from the first line to the last line.

On the other hand, in the data regarding the simple moving image read from the simple moving image table 21 in the video RAM 2, the vertical display start position information is stored in the simple moving image vertical display start position holding register 12 and the horizontal display start position. The information is temporarily held in the simplified moving image horizontal display start position holding register 13. Then, the data held in the simple moving image vertical display start position holding register 12 is supplied to the simple moving image line address conversion circuit 10 as the simple moving image moves.

Next, the data held in the simple moving image horizontal display start position holding register 13 is supplied to the simple moving image horizontal display start position control circuit 14 to control the horizontal movement of the simple moving image. In this case, the graphic pattern RO
The simple moving image pattern read from M3 is temporarily held in the simple moving image graphic pattern holding register 15. Then, the simple moving image pattern held in the simple moving image pattern holding register 15 is supplied to the color conversion table 5 via the graphic pattern switch 4 and converted into color data (image data).

Further, in the display color detection circuit 16, whether or not the simple moving image pattern held in the simple moving image graphic pattern holding register 15 occupies the rectangular area defining the simple moving image is displayed by the pattern data. The color pattern information is detected, and the graphic pattern switch is notified of the detection result. That is, as a result of detection, when the simple moving image pattern partially occupies the defined rectangular area, the graphic pattern switch 4 is configured to display an image on the on-screen display surface for the remaining area. Controlled.

Subsequently, the graphic pattern data and the simple moving picture pattern data converted into the color data by the color conversion table 5 are supplied to the next table control circuit 6 to be sent to the CRT.
Control for performing on-screen display of simple moving image information together with graphic information on the screen is performed. As a result, CR
At a predetermined display position on the T screen, the SW data which is a switch signal for switching the on-screen display is output together with the R, G and B data which are color data.

FIG. 4 is a schematic diagram showing the positional relationship between the data of the simple moving image definition table 21 shown in FIG. 3 and the simple moving image displayed on the simple moving image display surface. Here, an arrow (cursor mark) is displayed across the first and second lines on the simple moving image display surface. In order to perform such a display, the same graphic pattern code as the graphic pattern indicating the arrow is held in the first and second lines of the simple moving image definition table 21, and the horizontal display start position is also set. Data indicating the same display start position is held. As a result, the data of the first line and the data of the second line are different only in the vertical display start position. For the vertical display start position, positive data is held in the first line, whereas in the second line. Holds negative data. That is, since the vertical display start position is on the first line, the first line has positive data and the second line has negative data. In addition, since the simple moving image is not displayed for other lines, for example, NU is set as the graphic pattern code.
The LL code is retained. It should be noted that simple moving image patterns such as arrows shown in the figure are stored in a part of the graphic pattern ROM 3 shown in FIG. 2 in the same manner as a general graphic code pattern.

FIG. 5 is a timing chart for accessing a simple moving image. One scanning period on the TV screen is from the horizontal synchronizing signal shown in the figure to the next horizontal synchronizing signal. And an on-screen display period is provided within this period,
The horizontal blanking period is between the on-screen display period and the next on-screen display period. The horizontal blanking period is assigned to the period for accessing the simple moving image table 21 shown in FIG. That is, in the horizontal blanking period, the data of the vertical display start position is first read by the address supplied from the simple moving image read address generation circuit 8, and the data of the horizontal display start position is subsequently read. The graphic pattern code is read out.

In this case, the screen read address generating circuit 7 shown in FIG. 2 generates a row address updated in row units and a vertical display start position in the same row as an address generated for accessing the simple moving image table 21. , The horizontal display start position, and the line address updated in the same line for sequentially accessing the graphic pattern code are selectively used depending on the timing of generating each.

FIG. 6 is a flow chart showing the circuit operation for accessing the simple moving image definition table performed during the horizontal blanking period shown in FIG. When the horizontal blanking period starts, the address changeover switch 9 switches the video RA
The address of M2 is switched to the simple moving image side (S1), and the line address changeover switch 11 switches the line address of the graphic pattern ROM 3 to the simple moving image side (S2).

Subsequently, the vertical display start position is read from the simple moving image table 21 and held in the simple moving image vertical display start position holding register 12 (S3). Further, the horizontal display start position is read from the simple moving image table 21 and held in the simple moving image horizontal display start position holding register (S4).
Further, the graphic pattern code of the simple moving image is read from the simple moving image table 21 to obtain the graphic pattern R.
Supply to OM3 (S5).

Further, the simple moving picture line address conversion circuit 1
At 0, following the processing of step S3, in order to determine the vertical position of the graphic pattern to be read, the vertical display start position of the simple moving image vertical display start position holding register 12 and the current position A line address is calculated from the line number in the row (that is, the number counted from the first scanning line) and supplied to the graphic pattern ROM 3 via the line address changeover switch 11 (S6). Then, according to the calculated line address, the graphic pattern ROM 3
The simple moving image pattern thus read out is held in the simple moving image graphic pattern holding shift register 15 (S7).

In this case, the simple moving image graphic pattern holding shift register 15 has a depth corresponding to the number of colors of the graphic pattern. Further, the address conversion in the simple moving picture line address conversion circuit 10 can be realized by subtracting the line number of the vertical start position from the current line number as described above, but the subtraction result becomes negative, Alternatively, when the number of lines exceeds the number of lines, it means that there is no graphic pattern to be displayed, so that the display of the simple moving image is suppressed. Then, by executing the above circuit operation, the graphic pattern of the simple moving image to be displayed on the line is changed to the simple moving image graphic pattern holding shift register 15 within the horizontal blanking period.
Will be held in.

FIG. 7 is a continuation of the flowchart shown in FIG. 6 and is a flowchart showing the circuit operation for on-screen display of a simple moving image during the horizontal display period. That is, in the horizontal display period (the display access period corresponding to the on-screen display period shown in FIG. 5) following the horizontal blanking period, first, the address changeover switch 9 outputs the address from the screen read address generation circuit 7. It is switched to the normal display side so as to be supplied to the video RAM 2 (S8). Also, graphic pattern switch 4
Then, the switch is set to the normal display side (S9), and the line address changeover switch 11 switches the line address in the graphic pattern ROM 3 to the normal display side (S10).

Subsequently, the simple moving image horizontal display start control circuit 1
In step 4, the horizontal display start position data held in the simplified moving image horizontal display start position holding register 13 is compared with the current horizontal display position to check whether the current horizontal display position has reached the horizontal display start position. Then, (S11), at the time of arrival (Yes in S11), output of the simple moving image graphic pattern held in the simple moving image graphic pattern holding shift register 15 is started (S12).

Further, in the output simple moving image graphic pattern, the display color detection circuit 16 detects whether or not the simple moving image is transparent (S13). If it is transparent (Yes in S13), the graphic pattern switch 4 is set to the normal display side (S
14), if it is not transparent (No in S13)
The graphic pattern switch 4 is set to the simple moving image side (S15).

In this case, the simple moving picture holding shift register 1
In 5, the graphic pattern is shifted pixel by pixel (S17), and the simple moving image horizontal display start position control circuit 14 confirms the end of output of the graphic pattern of the simple moving image (S17). When the output of the pattern is completed (Yes in S17), the graphic pattern switch 4 sets the switch to the normal display side. The above circuit operation is executed and the horizontal display period ends.

After that, the graphic pattern which is normally displayed on the screen through the color conversion table 5 and the display control circuit 16 and the image data of the simple moving image are output to a predetermined position on the CRT. It should be noted that the switching between the simple moving image and the normal on-screen display may be performed after passing through the color conversion table 5, but in this case, the color conversion table 5 for the simple moving image needs to be prepared separately. is there. Further, it is possible to easily realize that the display priority is changed to bring the simple moving image display surface below the normal on-screen display surface.

By the circuit operation described above, it becomes possible to realize the normal on-screen display and the superimposed display of the simple moving image. As for the movement of the simple moving image, by rewriting the vertical display start position and the horizontal display start position in the simple moving image definition table 21, both horizontal and vertical movements can be easily performed in pixel units. Further, since this rewriting requires a small amount of calculation, it can be easily realized even by a low-speed, low-function CPU used in a normal television or VTR.

Further, according to the above circuit configuration, it is apparent that a plurality of simple moving screens can be formed in the vertical direction if there is no horizontal overlap in row units. Furthermore, a plurality of simple moving screens can be formed in the horizontal direction by preparing a plurality of sets of the simple moving image definition table 21 and the various registers described above within the range permitted by the access during the horizontal blanking period. Becomes It goes without saying that this circuit configuration can be applied not only to the graphic pattern ROM type on-screen display device but also to a normal character type on-screen display device.

In the above embodiment, the cursor mark is taken as an example of the simple moving image, but by using the simple moving image function of the present on-screen display device,
On-screen at a low price because it can realize a new movie-like on-screen display, which was not possible with the still-image-like on-screen display of TVs and VTRs such as a specific character moving around on the screen. The expressiveness of the display can be greatly improved.

[0046]

As described above, according to the present invention, it is possible to realize the on-screen display of a simple moving image such as a cursor, which cannot be done by the conventional on-screen display using the character display system or the graphic pattern ROM system. Further, regarding the realization of this function, it is not necessary to newly add an expensive storage element, and the conventional video RAM is used.
And the graphic pattern ROM can be effectively used, and the added control circuit can be easily integrated and housed in the same IC as the conventional on-screen control circuit. It is possible to realize on-screen display of a simple moving image without causing an increase.

Further, as a method of moving such a simple moving image, only the address indicating the display position of the simple moving image needs to be rewritten, so that an expensive CPU capable of high-speed processing is not required.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a relative positional relationship between a simple moving image display surface displayed on an on-screen display device according to the present invention and a TV display surface.

FIG. 2 is a block diagram showing a basic circuit configuration of an on-screen display device according to the present invention.

3 is a configuration diagram showing a configuration of a simplified moving image definition table 21 shown in FIG.

4 is data of the simple moving image table 21 shown in FIG. 3,
It is a schematic diagram which shows the positional relationship of the simple moving image displayed on a simple moving image display surface.

FIG. 5 is a timing diagram of access to a simple moving image.

6 is a flowchart showing a circuit operation for accessing the simple moving image table performed in the horizontal blanking period shown in FIG.

FIG. 7 is a continuation of the flowchart shown in FIG.

[Figure 8] On-screen image displayed on TV screen,
It is a schematic diagram which shows the example of a screen display at the time of superimposing and displaying a simple moving image.

[Explanation of symbols]

1 CPU 2 Video RAM 3 Graphic Pattern ROM 4 Graphic Pattern Switch 5 Color Conversion Table 6 Display Control Circuit 7 Screen Read Address Generation Circuit 8 Simple Video Read Address Generation Circuit 9 Address Change Switch 10 Simple Video Line Address Conversion Circuit 11 Line Address Change Switch 12 Simple Video Vertical Display Start Position Holding Register 13 Simple Video Horizontal Display Start Position Holding Register 14 Simple Video Horizontal Display Start Position Control Circuit 15 Simple Video Graphic Pattern Holding Shift Register 16 Display Color Detection Circuit 21 Simple Video Definition Table

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields investigated (Int.Cl. ⁷ , DB name) G09G 5/00-5/42 H04N 5/262-5/278

Claims (5)

(57) [Claims] 1. An on-screen display device capable of expanding and displaying display information such as character information and graphic information on an on-screen screen, the display information being further superimposed on the on-screen display information. Moving picture information storage means for storing moving picture information that is displayed and can be moved on the on-screen screen as fixed pattern information, and display in the fixed pattern information stored by the moving picture information storage means. A moving picture pattern code storage means for storing code information for specifying a predetermined moving picture pattern, a moving picture information display position deciding means for deciding a display position of the specified moving picture pattern on the on-screen screen, and the moving picture information display On-screen display according to the display position information determined by the position determining means Additionally superimposed on the broadcast and a video information display control means for controlling such that the video information is displayed, the moving pattern code storage means, moving pattern storing
Multiple code on-screen horizontally
An on-screen display device characterized by storing each line divided into 2. The moving image information display position determining means determines a predetermined rectangular area within the line of the on-screen screen or across at least two lines as a display position of a moving image pattern to be displayed. The on-screen display device according to claim 1 , wherein the on-screen display device is a display device. 3. The moving picture information display position determining means further determines the display position of the rectangular area by a horizontal address indicating a display start position of a moving picture pattern on an on-screen screen and a vertical line address in the row. 3. The moving image information can be freely moved in the on-screen screen on a pixel-by-pixel basis by determining and rewriting both addresses.
The on-screen display device described. 4. The moving picture information display control means reads out information on the display position determined by the moving picture information display position determining means during a horizontal blanking period, and further, the moving picture pattern code stored by the moving picture pattern code storage means. After reading out, during the on-screen display period following the horizontal blanking period,
4. The on-screen display device according to claim 3, wherein the moving image information is controlled to be displayed on-screen. 5. The moving picture information display control means further comprises a judging means for judging whether or not to display a background image of the moving picture information displayed in the rectangular area in at least a pixel unit. The on-screen display device according to claim 4 .