JPH0359455B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device using a repetitive scanning method, and more specifically, the present invention relates to a memory circuit for storing display data, and a display device that reads display data from the memory circuit in accordance with the display timing and displays the display data on the screen. The present invention relates to a repetitive scanning display device having a display control circuit that generates a display video signal and a printing device control circuit that transfers screen display data to a printing device and records the screen display data.

Display devices are becoming increasingly sophisticated, ranging from the conventional display of only text information to those that can also handle various graphical displays, and even when recording screen display data using a printing device, it is possible to For devices, this can be easily done by transferring the data code of character data to a printing device, but for display devices that handle graphic data that is difficult to encode, it is generally possible to do so by using a dot pattern format that expresses the screen display content as a set of dots. A method is adopted in which data is transferred to a printing device and recorded.

As a result, when the screen display data of a display device that handles graphics is recorded by a printing device, the graphics data is recorded in dot pattern format, and coded data such as format control data is recorded in code format for processing efficiency.
As the amount of data to be transferred increases, there is a need for a means to combine format data and transfer the data to a printing device at high speed without reducing the processing capacity of the device.

The present invention has been made by paying attention to the above-mentioned conventional situation, and therefore, an object of the present invention is to provide screen display data such as graphics when controlling a printing device and recording screen display data of a display device. A new means of creating data to be transferred to a series of printing devices without reducing the processing capacity of the devices is created by combining code data such as dot pattern format and format control data in code formats according to specified procedures. It is about providing.

The above-mentioned objects of the present invention include a memory circuit that stores display data, a display control circuit that repeatedly reads display data from the memory circuit in accordance with display timing and generates a video signal for screen display, and a printing device that records screen display data. In a repetitive scanning display device having a printing device control circuit for controlling the screen, a video signal storage circuit samples and temporarily stores the screen display video signal, and a code stores code data to be transferred to the printing device. Transfer data that combines the data stored in the data storage circuit, the video signal storage circuit, and the code data storage circuit in a specified procedure (into a print data format determined by the printing device) to create data to be transferred to the printing device. This is achieved by a repetitive scanning type display device characterized by adding an assembly circuit.

Hereinafter, a preferred embodiment of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows the circuit configuration of a typical graphic display device. In FIG. 1, a memory circuit 1 stores display data to be displayed on a screen, and a display control circuit 2 repeatedly reads display data from the memory circuit 1 in accordance with the screen display timing, and generates a video signal for screen display. generate a. Also, the printing device control circuit 3'
is the storage circuit 1 when transferring data to the printing device.
It sequentially reads out the dot pattern data stored in the printer and controls the transfer of the data to the printing device.

Next, an embodiment of the present invention is shown in FIG. In contrast to FIG. 1, FIG. 2 shows a configuration in which the printing device control circuit 3, which is the main point of the present invention, is also connected to a screen display video signal line, and inputs screen display data by directly sampling the video signal. It's getting better.

FIG. 3 shows the printing device control circuit 3 shown in FIG.
An example of the internal configuration is shown below. In FIG. 3, a code data storage circuit 31 is a storage circuit for setting code data such as control data to be transferred to the printing device, and is a storage circuit that sets code data such as control data to be transferred to the printing device. Set the necessary code data before data transfer. The video signal storage circuit 32 samples and temporarily stores the screen display video signal a output from the display control circuit 2, and usually stores screen display data in units of several lines on the screen. The stored data is sequentially read out from this in accordance with the data transfer speed with the printing device, and the screen display data is transferred to the printing device.

On the other hand, the transfer data assembling circuit 33 includes the code data storage circuit 31 and the video signal storage circuit 32.
The code data and screen display data in dot pattern format stored in the device are assembled according to a prespecified procedure, and the data is transferred to the transfer control circuit 34 according to the data transfer procedure information set in advance by the device control program. , specifies a read address for the code data storage circuit 31 and video signal storage circuit 32 via the address designation circuits 35 and 35', reads the transfer data, and sends it to the code data register 36 and video data register 37, respectively. Set. The selection circuit 38 selects the code data register 36 and the video data register 337 according to a command from the transfer control circuit 34, and sends necessary information to the data transfer circuit 39 to create transfer data for a series of printing devices. do.

The functional operation of this embodiment will be explained using an example shown in FIG. FIG. 4 shows an example of operation when screen data is recorded using a dot printing type printing device that expresses graphic data using a set of dots. Usually, in a dot-type printing device, before transferring dot pattern data for one line or one row,
Format control data that defines the number of dot pattern data to be transferred, print start position, line feed pitch, color specification, etc. must be transferred. In this case, in FIG. 4, if the display screen content is A, then according to the present invention, the format control data is stored in advance in the code data storage circuit 31, and the screen display data for each line is stored in advance. If an instruction is given to the transfer data assembling circuit 33 to combine the format control data using the code data storage circuit 33, the code data storage circuit 31 with the format control data C set in advance, and then sequentially C + D.
1+C+D2+C'+D3...C+Dn and the data to be transferred to the printing device can be created at high speed without placing a burden on the device control program.

As described above, according to the present invention, it is possible to transfer dot pattern data to a printing device at high speed without reducing the processing capacity of the device, and also to transfer encoded format control data and dot pattern format. Various printing devices can print a combination of screen display data, or a combination of format data such as coded headings and dot pattern graphic data, without placing any burden on the device control program. As display devices become more sophisticated, the effects are significant.

[Brief explanation of drawings]

FIG. 1 is a block configuration diagram of a conventional graphic display device, FIG. 2 is a block configuration diagram showing an embodiment of the graphic display device according to the present invention, and FIG. 3 is a detailed internal configuration example of a printing device control circuit. The figure shown in FIG. 4 is an explanatory diagram of the functional operation of this embodiment. 1... Memory circuit, 2... Display control circuit, 3,
3'...Printing device control circuit, 4...Display section, 10
... common bus line, 31 ... code data storage circuit, 32 ... video signal storage circuit, 33 ... transfer data assembly circuit, 34 ... transfer control circuit, 3
5, 35'...Address designation circuit, 36...Code data register, 37...Video data register, 38...Selection circuit, 39...Data transfer circuit, A...Display screen content, a...For screen display video signal.

Claims (1)

[Claims] 1. A memory circuit that stores display data, a display control circuit that repeatedly reads display data from the memory circuit in accordance with the display timing and generates a video signal for screen display, and a printing device control that controls a printing device that records screen display data. In a repetitive scanning display device having a circuit, the printing device control circuit includes a video signal storage circuit that samples and temporarily stores the screen display video signal, and stores code data to be transferred to the printing device. combining a code data storage circuit, the data stored in the video signal storage circuit and the code data storage circuit into a print data format determined by the printing device;
A repetitive scanning type display device comprising a transfer data assembling circuit that creates data to be transferred to the printing device.