JPS6337410B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display screen printer control method that displays pattern information on a display device and efficiently prints the screen independently of the screen display.

Conventionally, a scanning type display device temporarily stores display information in a pattern memory 2 of a display control unit 1 in correspondence with the screen, as shown in FIG. 1, for example.
This is displayed on a cathode ray tube (CRT) 3 using horizontal and vertical scanning signals. In this case, the memory information is simultaneously sent to the printer 4 and the display screen is printed on paper. This printer 4
2 is called a hard copy, and FIG. 2a shows an example of a printing section, and FIG. 2b shows an example of its control section. This printer is an electrostatic recording printer using a pin electrode and a counter electrode. That is, as shown in Figure a, an electrostatic recording paper is used as the printing medium 10, a printing section 11 and a developing section 12 are arranged in contact with the lower surface of the paper, and the printing medium 10 is connected to a pulse motor (PM) as shown in Figure b. )2
5. A so-called multi-stylus electrode consisting of a pair of a pin electrode 13 and an auxiliary electrode 13' is provided on the upper surface of the printing section 11, corresponding to, for example, 1024 bits per row, and a pulse motor (PM) 25 is provided.
A voltage is applied between the electrodes of the address bits corresponding to the images in each row of the paper being fed, and a latent image of dots is formed on the paper. This is sent to the developing section 12, toner is attached thereto, and an image is developed.

In the control unit 20 of the drawing b, the pattern memory 2
The memory information from is given to the control circuit 21, and the addresses of the pin electrode 13 and the auxiliary electrode 13' are read out by the recording matrices 22 and 22', respectively, and input to the drive circuits 23 and 23'. - from the power supply 24 to the pin electrode 13
300V, +300V to the auxiliary electrode 13' is the drive circuit 2
3, 23'. Timing control of the print medium 10 is performed by a pulse motor (PM) 25 under the control of a control circuit 21 in conjunction with voltage application from a power source 24 .

The problem with the above usage is that if the information in the pattern memory 2 can be accessed simultaneously and in parallel to the CRT 3 and the hard copy 4, processing will be quick and efficient. However, due to the nature of the load, the CRT 3 is an electron tube, while the hard copy 4 is an electrostatic recording device with a print medium interposed, so there is a large difference in access time, making parallel processing impossible. . Therefore, it may be possible to interrupt the access to print the hard copy 4 with the access to the CRT 3 screen display, but in this case, the CRT
Bits are missing intermittently on the screen of No. 3, and when this period of time is quite long, flickering occurs and is difficult to see. For this reason, conventionally, the screen display of the CRT 3 and the printing of the hard copy 4 have been operated separately under the control of the display control section 1, but it is clear that this is inefficient.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display screen printer control method that efficiently prints the display screen of a display device regardless of the screen display when outputting the display screen to a printer.

In order to achieve the above object, the display screen printer control method of the present invention includes a screen memory that stores display information for one screen, an address counter that gives an address to the screen memory for reading out the display information, and a horizontal blanking line. means for performing a logical sum of an erase signal and a vertical blanking signal and a memory read signal, and supplying the logical product output to the screen memory and the address counter; and one scanning line read from the screen memory. and a hard copy device that prints the display information stored in the register, and the address counter is configured to store display information in the screen memory while either one of the blanking signals is being input. For,
incrementing the address to read out the next display information of the display information read out and stored in said register during the previous blanking signal in the same order as the readout order for display; and the hardcopy device; The present invention is characterized in that printing is started when display information for one scanning line is stored in the register.

The principle and embodiments of the present invention will be explained in detail below.

FIG. 3 is a diagram explaining the principle of the present invention.

This figure is an explanatory diagram showing the scanning time of the pattern memory 2 in the display control section 1 of FIG. 1. The time to scan 1024 bits in the horizontal direction is 23 μs (microseconds), and the horizontal blanking (HBLK) time is 7 μs.
Move to the next raster in a total of 30 μs. The vertical direction is
It has a scan time of 1024 rasters and a vertical blanking (VBLK) time of 48 rasters, or 30 μs x 48 = 1.4 ms. In the present invention, the horizontal blanking time for each raster is 7 μs × 1024 and the vertical blanking time is 30 μs × 48
is used for printing memory information using a hard copy 4. This printing is CRT3
This is done regardless of the display on the page. As a result, display on the CRT 3 and printing on the hard copy 4 can be performed in parallel, allowing efficient operation.

Note that since the scanning speed of the screen display of the CRT 3 and the printing speed of the hard copy 4 are very different, the screen display of the CRT 3 is repeatedly scanned until printing of the hard copy 4 is completed.

FIG. 4 is an explanatory diagram showing the configuration of an embodiment of the present invention. In the same figure, horizontal blanking (HBLK)
OR circuit 3 for the signal and vertical blanking (VBLK) signal
1 and a read signal for reading information from the screen memory 2 are input to an AND circuit 32.
Therefore, the AND circuit 32 allows the screen memory 2 to be accessed only during the horizontal blanking time or the vertical blanking time.

Next, since the output of the AND circuit 32 is input to the address counter 33, the value of the address counter 33 is incremented. In addition, by inputting the output of this AND circuit 32 to the screen memory 2, display information for one raster stored at the position corresponding to the address indicated by the address counter 33 is read out, and display information of 1024 bits for one raster is read out. The pattern is stored in the register 35 and printed by the hard copy 4 in accordance with the method shown in FIGS. 2a and 2b described above.

As described above, according to the present invention, pattern memory information is displayed on the display device using scanning lines, and the printer is controlled by the memory information during the blanking time of the scanning lines, regardless of the screen display. The screen is printed. In this way, hardcopy printing can be performed without affecting CRT scanning, yet can operate nearly as efficiently as parallel operation. That is, since the address counter is incremented as described above and the display information for one scanning line is quickly stored in the register, the printing speed can be improved.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 a and b are general explanatory diagrams of a hard copy, Fig. 3 is an explanatory diagram of the principle of the present invention, and Fig. 4 is an explanatory diagram showing the configuration of an embodiment of the present invention. In the figure, 1 is a display control unit, 2 is a pattern memory, 3 is a CRT, 4 is a hard copy, 10 is an electrostatic recording paper, 11 is a printing unit, 13 is a pin electrode, 1
3' is an auxiliary electrode, 20 is a control unit, 31 is an OR circuit,
32 is an AND circuit, 33 is an address counter, 3
5 indicates a register.

Claims (1)

[Claims] 1. A screen memory that stores display information for one screen, an address counter that provides an address to the screen memory for reading out the display information, a horizontal blanking signal, a vertical blanking signal, and a memory read signal, and supplying the logical product output to the screen memory and the address counter; and a register for storing display information corresponding to one scanning line read from the screen memory. and a hard copy device that prints the display information stored in the register, and the address counter performs a function on the screen memory while either one of the blanking signals is input.
incrementing the address to read out the next display information of the display information read out and stored in said register during the previous blanking signal in the same order as the readout order for display; and the hardcopy device; The display screen printer control method is characterized in that printing is started when display information for one scanning line is stored in the register.