JPH0443595B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device, and particularly to a display device that displays a plurality of characters, figures, symbols, etc. at arbitrary positions on the screen of a display device.

[Conventional technology]

A raster scanning cathode ray tube (hereinafter referred to as CRT) is used as the display device, and memory (e.g. refresh memory using dynamic memory) is used.
The function of displaying information such as sentences (text), figures, images, etc. stored in a computer has become one of the important functions of an information processing device.

Conventionally, display devices that achieve this type of function generally edit and store the information to be displayed on the screen in a refresh memory, then read it out sequentially in synchronization with the CRT scanning timing and convert it into a video signal. A method is adopted in which the CRT screen is regularly divided into a large number of small sections, and each small section corresponds to a character or graphic element. It expresses text or still images as a series of characters or graphic elements. However, recently, not only the display control of this type of still image information, but also the display of video information, where the position on the screen where it should be displayed can be moved arbitrarily in time, has become particularly popular on home computers and video game devices. It is required in fields such as

FIG. 2 is a block diagram showing the main parts of a conventional moving image display device that displays characters, symbols, and figures by moving them to arbitrary positions. This device stores attribute information of the video to be displayed on one screen, such as vertical display position (Y), horizontal display position (X) information, video graphic identification information (N), color information, etc. attribute memory 10
2, a shape data memory 101 that outputs actual shape data based on the identification information of moving graphics, and its peripheral circuits.

During the video detection period, vertical display position information (Y) is sequentially read out from the attribute memory 102 by addressing with the video search counter 103 for each vertical scan, and the value of the vertical scan counter 105 is read out by the video detection circuit 104. (VC) and determines the moving image figure to be displayed on that scanning line. This comparative detection is usually realized by a subtractor. In other words
VC-Y=ΔY is calculated, and when ΔY is greater than or equal to "0" and smaller than the vertical size of the moving image, it is determined that the corresponding moving image should be displayed on that scanning line. The vertical size of the video, i.e.
The vertical display size is a fixed value that is determined by the configuration of the video detection circuit 104 and is shared by all video detections. When the moving image to be displayed is detected by the moving image detection circuit 104, horizontal table position information (X), moving image figure identification information (N), and color information (C) of the corresponding moving image are detected.
is similarly read from the attribute memory 102 and stored in the horizontal display position counter (hereinafter referred to as X counter) 106, identification information register (hereinafter referred to as N register) 108, and color register 109, respectively. Next, the shape data is read out from the shape data memory 101 by addressing using the identification information of the moving image figure and ΔY, and stored in the shape data register 107.
In this way, data necessary for displaying moving images to be displayed one after another is stored. Therefore, these X counters,
Each of the N registers and shape data registers is required as many as the number of moving images that can be displayed on one scanning line. Further, the shape data register 107 generally requires a capacity capable of storing the amount of data that can be read from the shape data memory 101 in one access.

Next, the moving image is displayed at a timing synchronized with the scanning system. From the start of the horizontal scanning display period, the X counter 106 is counted down by the dot clock, and when the count value reaches "0", the shape data register 107 is activated, and the shape data is shifted dot by dot, and the shape data is shifted in parallel. - Serial conversion. The output of the shape data register 107 is input to a synthesis circuit 110, color information is added thereto, and a synthesis process such as multiplexing is performed on the still image serial video signal 115 according to a predetermined display priority order, resulting in a serial video signal. Serial video signal generation circuit 1
11 and reflected on the CRT display.

[Problems to be solved by the invention] As described above, in the conventional video display device described above,
The horizontal size of a video figure that can be defined by one set of attribute information is determined by the data length that can be read simultaneously from the shape data memory and the capacity of the shape data register, and the vertical size is determined by the video detection. It has been difficult to set the size of each moving graphic because it is entirely determined by the hardware configuration of the circuit. For this reason, when expressing a display target larger than a settable size, it is divided into graphic segments of the maximum settable size and is represented by an aggregate of a plurality of moving graphics. However, when moving a video created using this method, it is necessary to change multiple sets of attribute information, which increases the burden on the software and reduces CPU utilization. Furthermore, since a plurality of moving images are occupied to express one type of moving image figure, there is a drawback that the types of moving images that can be displayed are reduced.

The present invention eliminates the above drawbacks and stores information specifying horizontal and vertical display sizes in an attribute memory in addition to the video attribute information required for conventional video display devices, and stores these information in an attribute memory. It is an object of the present invention to provide a moving image display device that can control the display size of each moving image figure based on the present invention and can display a mixture of moving image figures of arbitrary sizes.

[Means for solving problems]

The video display device of the present invention includes a display memory that stores video display data, and an attribute memory that stores at least video identification information indicating the type of video graphic, display position information, vertical display size information, and horizontal display size information. , a video control unit that detects a video to be displayed on a scanning line from a plurality of videos based on video identification information and display position information, and generates a display data address and display position information on the scan line for this video; an editing memory for storing information to be displayed on a scanning line as video data on a scanning line; means for changing detection criteria for a moving image to be displayed in the moving image control unit based on vertical display size information; and display of the detected moving image. The apparatus includes means for reading data from a display memory and storing it in an editing memory, and for controlling generation of video data using horizontal display size information, so that a plurality of moving image figures having different display sizes are displayed in a mixed manner.

[Example] Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. The video display device of the embodiment includes a shape data memory 1 that stores shape data of a video, video identification information indicating the type of video figure, and display position information (X,
Y), horizontal display size (X SIZE), vertical display size (Y SIZE), attribute memory 2 that stores color information and other attribute information necessary for video display, and video search that generates addresses for sequentially reading the attribute information. A counter 3, a video detection circuit 4 that detects a video to be displayed on each scanning line based on the read display position information, a video position information generation circuit 5 that generates display position information on the scan line, and video identification information. A video address generation circuit 6 that generates a read address for shape data based on the shape data memory 1
An editing memory 7 that converts, edits and stores the shape data read from the shape data into data corresponding to the video signal output, an edit memory address control circuit 8 that controls the writing and reading addresses of the edit memory 7, and color information for the shape data. etc., and a write control circuit 9 that generates data to be written to the editing memory 7; and a display size control circuit 10 that controls the number of times shape data is read and written to the editing memory based on the display size information of the moving image. , a video data register 11 that parallel-to-serial converts the display data read out from the editing memory 7 during the display period to generate serial video data, a scanning signal generating circuit 12 that generates a scanning timing signal for the CRT, and serial video data and scanning. It consists of a video signal generation circuit 13 that generates a signal for driving a CRT based on a timing signal. The output of the address selection circuit 15 and the data input/output line 19 are connected to the shape data memory 1, and a memory write signal for instructing a write operation and a memory read signal for instructing a read operation from a central processing unit (hereinafter referred to as CPU) are connected to the shape data memory 1. Supplied. Similarly, the output of the address selection circuit 16 and the data input/output line 20 are connected to the attribute memory 2 as well. When writing data to the shape data memory 1 and the attribute memory 2, first, the address selection circuits 15 and 16 transmit the value of the address bus 21 of the CPU as an address designation signal, and input and output the data via the data buffers 17 and 18. Lines 19 and 20 are connected to data bus 22. The CPU uses shape data memory 1 and attribute memory 2 through these control lines.
access to. Once predetermined data is stored in each memory, memory access for displaying the data is started. The address selection circuit 16 selects the output of the video search counter 3 as address designation information for the attribute memory 2, reads the video attribute information from the attribute memory 2 in order, and sets vertical display position information (Y) and vertical display size (Y SIZE). Based on the vertical scanning position information (VC) supplied from the scanning signal generating circuit 12, the moving image detecting circuit 4 detects a moving image figure to be displayed on the scanning line.

FIG. 3 shows a block diagram of one embodiment of the moving image detection circuit 4. This moving image detection circuit is composed of a subtraction circuit, and first, the subtraction circuit 201 detects the VC
The calculation −Yn=ΔYn is performed. △Yn is input to the subtraction circuit 202, and in the subtraction circuit 202, (Y
SIZEn) - △Yn=DET and calculate Y
Compare the size of SIZEn and △Yn. If EDT is positive, it is determined that △Yn is greater than or equal to "0" and smaller than or equal to Y SIZEn, and the moving image detection circuit 207 becomes active and the moving image figure n is detected as one of the moving images to be displayed on this scanning line. Ru. Therefore Y
By changing SIZE, the detected vertical scanning position, that is, the vertical display size is controlled. When a moving image is detected, the updating of the moving image search counter 3 is suspended and the search address of the detected moving image is held, and the horizontal display position information (X) read from the attribute memory 2 by the moving image position information generating circuit 5 is stored. Based on this, display position information on the scanning line is generated. The video address generation circuit 6 calculates the address of the shape data memory 1 from the video identification information, horizontal display size information (X SIZE), and ΔYn information in order to access the video shape data to be displayed at the position ΔYn. Generate specified information. Also, the horizontal display size (X
SIZE) and color information are stored in the display size control circuit 10 and the write control circuit 9, respectively. Next, the address selection circuit 15 selects the output of the video address generation circuit 6 to read the shape data of the video figure from the shape data memory 1, and the editing memory address control circuit 8 selects the output of the video position information generation circuit 5 to create the video. The shape data of the moving image figure is stored in the editing memory 7 at the address corresponding to the display position. Each time the shape data of a moving image figure is read from the shape data memory 1 and stored in the editing memory 7, the display size control circuit 10 decrements the value of It is updated to move at regular intervals, and the editing memory 7 is addressed based on the newly generated address to sequentially store the shape data. This operation is repeated X SIZE times,
If the amount of data that can be read from shape data memory 1 in one access is m dots, then
A moving image of (X SIZE) x m dots is formed. In this manner, moving image shape data is read out from the shape data memory 1 in response to detection of a moving image to be displayed, and edited and stored in the editing memory 7. The editing memory 7 has a capacity to store table data necessary for displaying at least one scanning line, and during a writing operation, the editing memory address control circuit 8 selects the output of the video position information generating circuit 5 and supplies it as a writing address, Color information is added to the shape data read from the shape data memory 1, and the data is converted and edited into display data corresponding to direct display, such as display timing and video signal level, and stored. In addition, during a read operation, the edit memory address control circuit 8 selects the output of the scanning signal generation circuit 12 as a read address, and synchronously supplies consecutive addresses in synchronization with the timing of the scan system to read the output of the edit memory 7. Read data sequentially. This read data is loaded into the video data register 11, subjected to parallel-to-serial conversion, and shifted in synchronization with the dot clock of the display pixels to become a serial video signal.The video signal generation circuit including an analog converter, an amplifier, etc. The signal is supplied to the CRT 14 via 13.

As described above, the detection conditions of the video detection circuit 4 are controlled for each video figure based on the vertical display size information (Y SIZE) stored in the attribute memory 2, and the display data of the video to be displayed on one scanning line is controlled. The display data of the moving image is edited and stored by repeating the operation of reading out from the shape data memory 1 and the operation of writing into the editing memory 7 while being controlled by the moving image detection signal of the moving image detection circuit 4 and the horizontal display size information (X SIZE). . The stored data is read out in synchronization with the scanning system and a video signal is generated and supplied to the CRT. By repeating these series of operations, a plurality of moving image figures with different display sizes are displayed in a mixed manner.

[Effects of the Invention] As explained above, the present invention stores information defining the horizontal display size and vertical display size in the attribute memory as video attribute information, and performs video detection control based on this attribute information. Then, by controlling the generation of video display data such as reading the shape data of the detected video shape from the shape data memory and editing and storing it in the editing memory, different sizes are defined for each video and mixed on the screen. There are effects that can be displayed. In addition, because a display target with a relatively large display size can be controlled using a single set of attribute information, it is easier to change the display position, manage video data, and generate video data compared to the conventional method of expressing it using a collection of multiple videos. The burden of troublesome video processing can be reduced,
Increases CPU utilization.

Furthermore, since any rectangular area can be defined on the screen, window display or split screen display can be easily realized by applying video display.

As described above, according to the present invention, moving image figures of any display size can be easily mixed and displayed.
It is possible to provide an inexpensive video display device that can be used for multiple purposes.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of a conventional video display device, and FIG. 3 is a block diagram of a video detection circuit according to an embodiment. 1,101...Shape data memory, 2,102
...Attribute memory, 3,103...Movie search counter, 4,104...Movie detection circuit, 5...Movie position information generation circuit, 6...Movie address generation circuit,
7... Edit memory, 8... Edit memory address control circuit, 9... Write control circuit, 10... Display size control circuit, 11... Video data register,
12...Scanning signal generation circuit, 13,111...Video signal generation circuit, 14...CRT, 15,16...
...address selection circuit, 17, 18... data buffer, 19, 20... data input/output line, 2
1,113... Address bus, 22,114...
Data bus, 105...Vertical scan counter, 10
6...Horizontal display position counter, 107...Shape data register, 108...Identification information register, 1
09...Color register, 110...Synthesizing circuit,
112...Scanning timing generation circuit, 201, 2
02... Subtraction circuit, 203... Vertical scanning position information (VC), 204... Vertical display position information (Y), 205
...Vertical display size information (Y SIZE), 206...
...△Y, 207...Movie detection signal.

Claims (1)

[Claims] 1. In a video display device that reads video display data stored in a display memory and generates a video signal to a display device, at least video identification information indicating the type of video graphic, display position information, vertical display size information, and horizontal display are provided. an attribute memory for storing size information, and a video to be displayed on a scanning line from a plurality of videos based on the video identification information and display position information, and a display data address of the video and display position information on the scan line. an editing memory that stores information to be displayed on one scanning line as video data of a scanning line, and a detection criterion for a moving image to be displayed in the video control unit is changed based on the vertical display size information. and means for controlling generation of video data for reading display data of a detected moving image from the display memory and storing it in the editing memory using the horizontal display size information, A video display device characterized by displaying a mixture of video figures.