JPS59146087A - Display for repetition scanning system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device, and more particularly, the present invention relates to a display device, and more particularly, a dot memory that stores screen information as a set of dots (if information), and sequentially stores data from the dot memory in accordance with the screen display timing. The present invention relates to a display device using a reversing scanning method that displays a clear screen by extending the image by one angle.

A repetitive scanning display device with a don't-moment feature is
It is expressed in a multiplicative format of display data points on the screen, where one point on the screen corresponds to one address in the dot memory, and the display data is converted from the dot memory in accordance with the screen display timing. By repeatedly reading out the image, one fli image is displayed.

In this manner, in a repetitive scanning type display device having a dot memory, in order to display the entire screen, it is necessary to read out display data sequentially from the dot memory in accordance with the display timing. For this reason, when display data is written or data is read from the memory in conjunction with display data transfer, these and the data FjJ'C for screen display overlap, and as a result, display data is written in one time or h ) I: It is necessary to prioritize the extrusion processing to the data extrusion for screen display, and during this time normal data for inward display cannot be read out, causing flickering in the display.

Conventionally, in order to avoid this, the display data loading and reading section, f! f! , i. A method that does not affect data reading for screen display by limiting the reading of screen display data to the horizontal or vertical retrace time when it is temporarily interrupted, or a method that operates the dot memory at high speed to display the screen. Both iii within one cycle of reading data for
A method was adopted in which periods were provided for reading data for water and writing or reading display data, and writing or reading display data without affecting data reading for screen display.

However, among these 11 methods, the former severely limits the period during which writing and reading operations can be performed on the dot memory, and as a result, the processing capacity of the screen control that performs screen writing and reading is significantly reduced. The latter method requires the memory to operate at twice the normal speed, and is applicable to display devices with a relatively small display capacity, but as the display capacity increases. Furthermore, it is necessary to shorten the data read cycle for screen display, which is difficult to achieve considering the operating speed of general memory circuit elements.

The present invention has been made in order to eliminate the above-mentioned problems of the prior art.Therefore, an object of the present invention is to enable dot memory to be constructed from ordinary memory elements, and to provide a screen: fliil 4'iti+
It is an object of the present invention to provide a new means capable of suppressing a decrease in the processing capacity of the computer and also suppressing screen flickering when display data is loaded and read.

In order to achieve the above object, a display device according to the present invention has an F
ff1iIfi has a dot memory that stores all points of display data as a set report, and repeats scanning in which stored data is sequentially extracted from the dot memory in accordance with the screen display timing, and this read data is also displayed on the screen. Method σ) In the display section ut, when operating the dot memory to include or extract old art dealer display data, II! l! It's multiple It! 1 is written all together or -1 is configured to protrude.

Next, the present invention will be described in detail with reference to a preferred embodiment and the drawings.

FIG. 1 shows the circuit configuration of a repetitive scanning type display section fat having a general dot memory. In FIG. 1, a refresh counter 1 specifies a read address for sequentially and repeatedly reading out display data from the entire memory 2 for screen display, and operates in accordance with the screen display timing.

The address designation circuit 5 controls the writing or reading of display data into the dot memory 2, and instructs switching of the address designation signal of the dot memory 2 and instructs the dot memory 2 in accordance with instructions from the device control program via the system bus 10. an instruction to close the display data transfer gate in order to prevent read data other than the read address of the screen display data from being displayed on the screen via the display control circuit 7;
It issues reading and writing instructions to the dot memory 2. The multiplexer 4 switches the address designation signal for the dot memory 2, and normally inputs the output of the retrace counter 1 as the address (, () of the dot memory 2, and reads the data for display on the screen. When writing and reading display data, the contents of the address register 3, in which address information for writing or reading display data is set in advance, are inputted as address signals to the dot memory 2 according to instructions from the address designation circuit 5. , song jfcI display data is stored, and screen display data is stored as point set information.The display control circuit 7 generates a video signal for screen display from the display data read out from the tonto memory 2. The output gate circuit 9 outputs the data read from the memory 2 to the system bus 10 according to a command from the device control program.

Next, the configuration of the memory, which is the main point of the present invention, will be explained.

As shown in Fig. 2, a normal dot memory has a plurality of dots that are continuous in the lateral force direction on the screen (when the scanning line is in the lateral force direction) due to the focus structure of the memory element forming the dot memory 2 and its operating speed. Dots (in 8-bit units in the example in Figure 2) are set to 1
The display data for the double -sided display is the one -month included or the 1st place to JY? IC protrusion and control F11
71 writing and reading of the memory by one program is also performed in this unit.

In contrast to this, in the present invention, as shown in FIG. 3, by duplicating the multiplexer 4.4a for selecting the refresh counter 1 or the address register 3,
Writing and reading by the device control program to and from memory are performed by rAl, A3, A5, A7Jr.
A2, A4, A6, A8JrB1, B3, B
5, B7 JrB2 , B4 , B6 , B8 J Looking in the horizontal direction on the screen, M number of dots (4 dots from t in the example in Figure 3) that are 1 apart at 1 dot intervals are one writing and reading unit. The structure is as follows.

Also, when reading display data for screen display, μ
There are many consecutive dots (in this case, "Al
~A, 8JrB1~f38J, ``'' has a circuit configuration that performs the process in units of 8 tons. With this configuration, T6<protrusion7 of display data for screen display
If the control program executes one H write or read while the multiplexer 4
．． 4a by the addressing circuit 5, this! ! The writing or bleeding by the ifJ control program is, for example, rAl, A3, as described above.
, A5, A7J in units of 4 bits fL, and the remaining 4 dots rA2, A4, A6, A8J can read display data for screen display. Therefore, the conventional disadvantage M in that the data leakage for screen display cannot be executed at all due to the read operation of the storage memory accompanying the writing of display data or the transfer of display data is avoided.

As described above, according to the present invention, since data is stored in and read out from the dot memory by the control program at intervals of one dot, the device (control program) performs data reading and reading of data for screen display. The display data of every other dot in the memory group can be guaranteed, and the occurrence of flickering on the screen can be greatly reduced.In particular, the present invention can be applied to graphic display devices with a large display dot capacity. If you do, the effect will be greater.

Although the present invention has been described above with respect to one preferred embodiment thereof, this is merely an illustrative example, and the present invention is not limited only by the embodiment described herein, and there is no possibility of departing from its scope. Needless to say, it includes any unscrupulous modifications and changes.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a display device of a flip-edge scanning type having a general dot memory, FIG. 2 is a diagram of a typical dot memory, and FIG. 3 is a diagram of the configuration of a dot memory showing an embodiment of the present invention. It is a diagram. l e@・refresh counter, 2...dot memory, 3・ψ・address register, 4.4a... multiplexer, 5@lI+1 address designation circuit, 6... display data transfer gate, 7... display control Circuit, 8...
Display section, 9... Output gate circuit, 10... System bus

Claims (1)

[Claims] It has a dot memory that stores the screen display data as a set of points, reads out the stored data sequentially from the dot memory in accordance with the screen display timing, and performs a repetition 7 in which the read data is also displayed on the screen. In a display device, when operating the dot memory for writing or reading screen display data, a plurality of points IJ# that are separated by one on the screen in the lateral force direction or vertical direction are read out or read out at once. A display device using a repetitive scanning method that uses this as a percentage sign.