JPH02202181A - Screen display device - Google Patents

Abstract

PURPOSE:To scroll display contents such as a character and pattern, etc., from an arbitrary position on a picture by providing a register for scroll mode in a display control register and setting the value of prescribed data for scroll to this register for scroll. CONSTITUTION:In a display control register 6, a scroll register 61 is provided to hold the data for scroll composed of start position data to show the start position of scrolling, scroll width data to show the width of the scrolling and scroll direction data to show the direction of the scrolling. In a display control circuit 13, a scroll control means 131 is provided to scroll the display contents such as the character and pattern, etc., from the arbitrary start position in an upper direction or lower direction with the prescribed scroll width based on these data for scroll. Thus, when the data for scroll are held in the display control register 6, the display contents such as the character and pattern, etc., are scrolled by the scroll control means 131 from the arbitrary position on the picture in the upper or lower direction according to the held data for scroll.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a screen display device for displaying characters such as a channel number or a pattern in a broadcast image displayed on a display device such as a cathode ray tube.

[Conventional technology]

FIG. 6 shows an example of the configuration of a conventional screen display device of this kind. In FIG. 6, 1 is a display oscillation circuit to which the oscillation output of the π-type LC oscillation element circuit 1a is supplied, and 2 is the display oscillation circuit. A timing generator 3 generates various timings using signals oscillated by an oscillation circuit 1, and input terminals 3a are connected to the output of the timing generator 2 and an external control circuit such as a microcomputer (not shown) for controlling the screen display device.

Control data input to 3b and 3c (display on).

4 is a data control circuit, 5 is an address control circuit, 7 is a display data memory for storing control data,
Consists of RAM. A display character memory 8 stores characters and patterns to be displayed in the font structure shown in FIG. 7, and is composed of a ROM. 6 is a display control register that latches commands such as display control among the outputs of the input control circuit; 9 is a display control register that inputs the horizontal synchronization signal and vertical synchronization signal of the video signal supplied to terminals 9a and 9b; 11 is a display position detection circuit for detecting the display position of characters, patterns, etc. on the display device; 13 is a display control circuit that controls the output of display character memory 8; The zero-screen display device that performs display control according to display commands from the display control register 6 is composed of the above-mentioned circuits, and the display control circuit 13
The output is supplied to the video mixer 17, and the video mixer 17 outputs a composite video signal via the CVIDHO terminal 17a. Further, the display control circuit 13
R, G, B color signals, etc. are outputted from the terminals 13a to 13f. 10 is an H counter, 14 is a shift register, 15 is an oscillation circuit for generating a synchronizing signal to which the oscillation output of the oscillation element circuit 15a is supplied, 16 is a timing generator for generating a synchronizing signal, and 2j is a blinking circuit.

Next, the operation will be explained. The input control circuit 3 processes control data input from a microcomputer or the like through terminals 3a, 3b, and 3c, causes the display control register 6 to latch commands for display control, etc., and displays the display contents, such as character codes. data memory 7. During display, the character code stored in the display data memory 7 accesses the display character memory 8 as output data, and the display character font output from the character memory 8 is sent to the display control circuit 13 via the shift register 14. input. Here, the display data memory 7 is composed of a total of (a + b) · C bits, where l word is (a + b) bits and the number of characters to be displayed is C. On the other hand, it is assumed that one font of the display character memory 8 is composed of (1Xm) bits, and there are n characters of types.

In addition, the timing at the time of display is determined by inputting a synchronizing signal from the video signal to the synchronizing signal switching circuit 9, counting this synchronizing signal with the H counter 10, and then using the display position detecting circuit 11 based on this count value to display the characters displayed on the display device. The 0 display control circuit 13, which determines the position of the display character, synchronizes the display character output with an external video signal, controls the display according to the contents of the display control register 6, outputs it, and supplies it to the video mixer 17.

Note that the synchronizing signal generation oscillation circuit 15 is the oscillation element circuit 1
5a, it is possible to generate a synchronization signal of the NTSC system or PAL system, and this switching is performed by the signal from the N/P terminal 15b, thereby outputting 4fsc or 2fsc oscillation, and the timing generator 16 for generating the synchronization signal outputs oscillation of 4fsc or 2fsc. Since a synchronizing signal is generated, display on the TV screen is possible even when there is no signal. However, fsc is the color subcarrier,
In the NTSC system, it is 3.58 MHz, and in the PAL system, it is 4.43 Mflz.

In addition, the video mixer 17 allows NTSC and P
It is possible to generate an AL type composite video signal and to superimpose it onto an external composite video signal. Composite video signals include character level (LECIA), external composite video input (CVrN), blanking level (LEBK),
The six signals of background carrier color signal input (R3IN), color burst input (CBIN), and sync chip level are switched and synthesized using an analog switch, and the CVIDEO terminal 17
Output from a.

[Problem to be solved by the invention]

However, conventional screen display devices do not allow scrolling of characters, patterns, etc., and when displaying more than one screen worth of text, it is necessary to switch screens for each screen.

In this case, by changing the display position of the characters, patterns, etc., it can be made to appear as if the characters, patterns, etc. are scrolling upward or downward, but the scrolling speed is predetermined, and the characters, patterns, etc. There was a problem that the patterns etc. did not disappear naturally.

This invention was made to solve the above problems, and by newly providing a scroll mode register in the display control register and setting a predetermined scroll data value in this scroll register, the screen The purpose is to enable scrolling of displayed contents such as characters and patterns from any position on the screen.

[Means to solve the problem]

For this reason, the double-sided display device according to the present invention has a display control register for scrolling which is composed of start position data indicating the scroll start position, scroll width data indicating the scroll width, and scroll direction data indicating the scroll direction. A scroll register is provided to hold data, and a scroll register is provided in the display control circuit to scroll display contents such as characters, patterns, etc. upward or downward by a predetermined scroll width from a predetermined start position based on this scroll data. It is characterized by the provision of control means.

[Effect]

When the scroll data is held in the display control register, the scroll control means scrolls the display contents of characters and patterns upward or downward from any position on the screen according to the held scroll data.

In this case, the screen display position is detected by counting horizontal synchronization signals.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

Note that the same components as those in the prior art are given the same numbers and their explanations will be omitted.

FIG. 1 is a block diagram of an image display device showing an embodiment of the present invention.
31 is a scroll control means provided in the display control circuit 13 for scrolling display contents such as characters and patterns upward and downward from a predetermined screen display position based on data in the scroll register 61; A video signal generation circuit 19 generates each internal video signal, and a boat output control circuit 19 outputs R, G, and B color signals or boat output signals from boat output terminals 19a to 19f.

Next, the operation will be explained.

When an address indicating the address of a scroll register and scroll data, such as data specifying a display position on the screen, are sequentially input to the input control circuit 3 as a serial signal from an external control circuit such as a microcomputer, the scroll register 61 holds the data for scrolling.

When the scrolling data is held in the scrolling register 61, the scrolling control means 131 in the display control circuit 13 operates, and the display contents such as characters and patterns on the screen are moved to a predetermined display position on the screen. Scroll upward or downward by a predetermined scroll width.

The start position of this scrolling is determined by counting the horizontal synchronizing signal input via the synchronizing signal switching circuit 9 with the H counter 10.

FIG. 2 is a detailed configuration diagram of this scroll control means 131, in which 131a is a start position detection circuit that detects the scroll start position, 131b is a scroll width control section that controls the scroll width and scroll direction, and 131
C is a scroll section that starts scrolling upward or downward from a predetermined start position by a predetermined scroll width in response to signals from the start position detection circuit 131a and scrolling control section 131b.

In such a configuration, when scroll data of a certain value is held in the scroll register 61, the scroll data consists of a predetermined bit that determines the scroll width, a predetermined bit that determines the scroll direction, and a predetermined bit that determines the scroll start position. , the start position detection circuit 131a detects the start position from the output of the display position detection circuit 11 and the value of a predetermined bit that determines the start position of the scroll register 61, and from this start position the scroll section 1
31C scrolls the displayed contents of characters and patterns upward or downward by a predetermined scroll width based on the output of the scroll width control section 131b.

FIG. 3 shows the screen configuration of the screen in the scroll mode at this time.

For example, if 24 characters x 12 lines of characters are displayed as the display content on the display screen, in the scroll mode, the 12th line 20n of the bottom line is the dummy line, and the 1st line 20a of the bottom line is the dummy line. A scroll display of 24×11 lines is performed as a fixed line.

For example, if the 8th line is designated as the scroll start position, the display contents of the 2nd line to be displayed on the next screen will be displayed on the line following the 8th line.

4 and 5 are diagrams showing the actual state of screen scrolling when the scroll width is one line, the scroll direction is upward, and the scroll start position is the second line. The position of the second line 20b in the figure is the third line 2 of Fig. 4.
The contents of 0c are placed in the position of 20c of the third line in Fig. 5, and the contents of the next fourth line 20d of Fig. 4 are scrolled upward one line at a time until the first line is a fixed line. It seems to disappear inside. At this time, if the width of the scroll is set to two lines, the scrolling speed will increase.

〔Effect of the invention〕

As explained above, according to the present invention, the scrolling data includes start position data that determines the scroll start position, scroll width data that determines the scroll width, and scroll direction data that determines the scroll direction in the display control register. A scroll register for holding the above-mentioned scroll register is provided, and a scroll control means for scrolling display contents such as characters and patterns based on the scroll data set in the scroll register is provided in the display control circuit. It is also possible to scroll at a predetermined speed from a predetermined start position on a video display device, which has the effect of making it possible to continue reading the next display content while retaining the image of the past display content.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a detailed block diagram of the scrolling means shown in FIG. 1, FIG. 3 is a diagram showing the screen configuration in scroll mode, and FIGS. Figure 5 is a diagram showing the actual screen of scrolling, Figure 6
The figure is a block diagram of a conventional screen display device, and FIG. 7 is a block diagram of the font structure of a conventional display character memory. DESCRIPTION OF SYMBOLS 1... Display oscillation circuit, 2... Timing generator, 3... Input control circuit, 4... Data control circuit, 5... Address control circuit, 6... Display control register, 7... ... Display data memory, 8... Display character memory, 9... Synchronous signal switching circuit, 11... Display position detection circuit, 13... Display control circuit, 1.7...
・Video mixer 18...Video signal generation circuit, 1
9... Boat output control circuit, 61... Scroll register, 131... Scroll control means, 131a
...Start position detection section, 131b...Scroll width control section, 131c...Scroll section. In the drawings, the same reference numerals indicate the same or corresponding components. Agent Masuo Oiwa (and 2 others) Figure 3 Figure 7 procedural amendment (voluntary) 4

Claims (1)

[Scope of Claims] A screen display device that displays characters and patterns on a display device such as a cathode ray tube includes an oscillation circuit that generates signals that serve as a reference for various timings, and various timings based on the oscillation signals of the oscillation circuit. A timing generator that generates a signal, an input control circuit that accepts and processes a control signal from an external control circuit such as a microcomputer, a synchronization signal switching circuit that inputs a synchronization signal for a video signal to be displayed on the display device, and A display position detection circuit that counts synchronization signals to detect the display position of the display device, and control data such as characters, pattern codes, blinking information, etc. that are processed by the input control circuit and are to be displayed on the display device. a display data memory for storing; a display character memory for storing fonts of characters displayed as the display contents;
a video mixer that mixes a predetermined display signal with the video signal in order to display display content at a predetermined position on the display device based on the position detection signal from the display position detection circuit;
a display control register that holds data input from the external control circuit to the input control circuit; The display control circuit has a scroll register that holds scroll data consisting of data and scroll direction data that indicates the direction of scrolling, and the display control circuit adjusts a position on a predetermined screen based on the scroll data held in the scroll register. 1. A screen display device comprising scroll control means for scrolling display content in a predetermined direction with a predetermined scroll width.