JPS585433B2 - Display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display system for a CRT (cathode ray tube) that uses a long and narrow display section such as a one-line display device, and in particular displays a scale on the display screen only when it is necessary. This provides a display method that makes it easier to see commonly used characters.

Conventionally, in a one-line CRT display, a transparent plate with a scale carved thereon was attached to the top surface of the display in order to adjust the display position.

However, in CRTs, distortion occurs between the center and edges of the display screen, so the actual display position is
It is impossible to select all the right edges equally, and it is difficult to match the display position and the scale accurately.

Furthermore, since the display surface of a CRT is made of glass with a considerable thickness, positional deviations will occur unless the viewing point is perpendicular to the display surface depending on the point to be viewed.

Furthermore, there is a problem in that viewing angles are limited in the vertical direction as well.

Moreover, it is useless if the number of digits is switched in three or more steps.

Furthermore, in a multi-line display, a method is known in which a scale is constantly displayed by emitting light on the upper side, lower side, or left and right sides of the display surface.

However, if this method is directly applied to a one-line display device and an area for displaying scales is provided on the top or bottom of the display surface, normal character display or tablet TAB etc. can be displayed on a long and narrow display surface. Since the function symbol is displayed at the same time, it becomes extremely difficult to see, and a circuit such as a display buffer is required, resulting in an increase in cost and other inconveniences.

Therefore, the display method of the present invention eliminates the need for an external scale plate, makes effective use of the narrow display surface, and can display appropriate scale information even in a display method using an automatic digit switching method. Moreover, it is an object of the present invention to provide a display method that can display scales that are as large and easy to read as possible.

In other words, in this type of display device, the operations that require a scale are quite limited.
In normal key operations, there is generally no correspondence with the scale.

In the display method of the present invention, focusing on such usage characteristics, the scale is not displayed on the display surface of the display when the scale is not required, and the scale is displayed in the normal character display area. I'm trying to use it.

Therefore, each function symbol such as the tablet, margin, cursor, etc. is displayed corresponding to the character in the normal character display, so the operator can clearly understand the position, and also set and change the function symbol. During operation, each function symbol can be displayed at arbitrary intervals by the scale display.

Next, the display method of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is an example of a block diagram of a control section used to implement the display method of the present invention.

In the drawing, 1 is an input code determination circuit, 2 is a memory, Ml is an area for storing normally displayed characters,
M2 is a scale information area prepared for displaying scales, M is an area for displaying symbols such as tablet TAB and margins, 3 is a data pointer, 4 is an adder, and 5 is a data pointer.
is the address register, 6 is the adder, 7 is the M1 address pointer, 8 is the M2 address pointer, 9 is the M3 address pointer, 10 is the flip-flop, 11 is the 2
56-decimal counter, 12 is data buffer register, 1
3 is a function buffer register, 14 is a character generator, 15 is a pattern generator,
16 indicates a CRT interface circuit.

Further, A1 to A1o are AND circuits, OR is an OR circuit, AKEYIN is a key input line, and DISP is an input line for display commands.

The input code determination circuit 1 determines whether the data transferred from the keyboard via the key input line KEYIN is a character that should normally be displayed, or input from a function key for changing or setting a symbol such as a tablet set. A circuit that determines whether the flag is the flip-flop FF-D or FF-F is set depending on the determination result.

First, to explain the case of normally displayed characters, the flip-flop FF-1 is set by key input, and the simultaneously generated strobe signal STB is output from the AND circuit A1 to open the gate of the AND circuit A2. Area M of memory 2 indicated by pointer 3
Store data in 1.

Each time data pointer 3 is accessed, it is incremented via adder 4 by the output of AND circuit A1 so as to indicate the address to which data is to be input next in memory area M1.

In this way, when the display data of the key input is stored in the memory area 1, a central processing unit C (not shown) is required to display this new data on the display.
Under the control of PU, a disfly instruction DISP instructing data transfer to data buffer register 12 is applied to AND circuits A3 and A6.

Address pointers 7 to 9 store the start addresses of each display data area of memory areas M1 to M3, respectively.

In this case, since the flag of flip-flop FF-D is set, the signal is output from AND circuit A3, the output gate of AND circuit A4 is opened, AM is output from address pointer 7 to address register 5, and memory The start address of air M1 is set.

This display command DISP is simultaneously applied to the flip-flop 10 to set it and transfer the data in the selected memory 2 to the buffer register 12 or 13.
Preparations are made for transfer to.

The counter 11 is in 256 decimal notation in this embodiment because the maximum number of characters is 128, and when the count value is O to 127, data transfer of memory area M1 or M2 is performed. ~255
At this time, data transfer of memory air M3 is performed.

Therefore, in this case, each memory air M1 to M3 and the data buffer register 12 and the function
Buffer registers 13 each consist of 128 bytes.

Then, when the flip-flop 10 is set, the output lines 0 to 127 of the counter 11 become III at this time, so that the contents indicated in the address register 5 by the first clock φ, that is, the data in the memory area M1, are changed to data. The data is transferred to the buffer register 12.

The address register 5 and counter 11 are each incremented, and the memory area M is incremented at the next clock φ.
The second data of , is transferred.

Through such operations, the contents of the memory area M1 are sequentially transferred up to the count value 127, and 128 bytes of data are transferred to the data buffer register 12.

Next, when the count value exceeds 128, it is output from the output line 012B of the counter 11, the output gate of the M3 address pointer 9 is opened, and its contents are set in the address register 5.

F%, AND circuit A, data buffer register 1
The selection gate No. 2 is closed, and the gate for selecting the function buffer register 13 of the AND circuit AIO is opened instead.

Then, as in the previous case, the count value is 128 to 255.
Then, the contents of memory area M3 are transferred to function buffer register 13.

In this way, when the transfer is performed sequentially and is output from the output line C255 of the counter 11, the flip-flop 10
is reset, and the data transfer to the display buffer registers 12 and 13 by the display instruction is completed.

Each of the buffer registers 12 and 13 is composed of a circular shift register, and is operated in synchronization with the clock φ given from the AND circuit A8 during data transfer from the memory 2, and at other times, the buffer registers 12 and 13 are operated via the CRT interface. It operates under the control of a circuit 16.

FIGS. 2A and 2B show the display surface of a line CRT display, and FIG. 2A shows a normal character display.

That is, in the case of normal character display, the data buffer register 12 transferred from the memory area M1
The display data and data for symbol display in the function buffer register 13 transferred from the memory air M2 are output from the CRT interface circuit 16 via the character generator 14 and pattern generator 15, and are outputted from the CRT interface circuit 16 to the display. Projected onto the display screen.

The above is a case where the key force is normal display data, but for example, if the key force is to set or reset the tablet TAB, operate the margin, etc., or simply to display the scale, etc. , these are determined to be function key inputs by the input code determination circuit 1, and the flip-flop FF-F is set to make its output 111.

In this case, data is not input to memory area M1.

Then, when the display command DISP is given, M2
The output gate of address pointer 8 is opened, and the start address of memory area M2 is set in address register 5.

The subsequent transfer to the display buffer registers 12 and 13 is performed in the same manner as in the case of normal display.

Figure 2B shows the state of the scale display, and the tablet, margin, cursor, etc. are the same as in Figure 2A,
Scale information stored in advance in the memory area M2 is displayed in the data area on the display surface of the display.

In this way, the display method of the present invention does not display the scale on the display surface when it is not needed, and uses the normal character display area when the scale is necessary, so that it can be displayed on the long and narrow display surface. This eliminates the difficulty of viewing the scale and normal display characters, function symbols, etc., which are displayed at the same time.

In addition, the scale data for displaying the scale is stored in a memory with the same maximum number of display digits as the memory that stores display characters and function symbols, and is always stored in a 1:1 ratio in memory 2 and buffer registers 12 and 13. Since they are compatible, the character display position and the number of displayed digits of the scale data can be changed simultaneously, and there is no need to adjust the positions of both even when switching three or more stages or using an automatic digit number switching method.

In addition, in order to switch between scale display and normal character display, it is necessary to provide a dedicated switch for that purpose, or to switch from normal character display to scale display by operating a function key on a tablet or margin that requires scale display. It is only necessary to switch to the previous character display when the operation is completed.

And its operability is not particularly degraded.

Furthermore, the present invention can be applied not only to line CRT display devices but also to elongated CRT display devices with several lines.

Therefore, the present invention is not limited to the embodiments described in connection with FIGS. 1 and 2A and B above.

[Brief explanation of the drawing]

FIG. 1 is an example of a block diagram of a control section used to implement the display method of the present invention, FIGS. 2A and B show the display surface of a one-line CRT display, and FIG. A is a normal character display state. , Figure B shows the state of the scale display. In the drawing, 1 is an input code determination circuit, 2 is a memory, Ml is an area for storing normally displayed characters,
M2 is a scale information area prepared for displaying scales, M3 is an area for displaying symbols such as TAB and margins, 3 is a data pointer, 4 is an adder, and 5 is a data pointer.
is the address, register, 6 is the adder, 7 is the M1 address pointer, 8 is the M2 address pointer, 9 is the M3 address pointer, 10 is the flip-flop, 11 is the 2
56-decimal counter, 12 is data buffer register, 1
3 is a function buffer register, 14 is a character generator, 15 is a pattern generator,
16 is a CRT interface circuit, and A1-
A10 indicates an AND circuit, OR indicates an OR circuit, and KEY
IN is a key input line, and DISP is a display command input line.

Claims (1)

[Claims] In long and narrow CRT display devices such as 11 lines, normal character display, function symbols such as tablets and margins, and scale data are stored in memories with the same maximum number of digits, and the function symbol display area and normal The scale is displayed in the normal character display area only when setting or changing the function symbol, or when scale display is simply requested using a dedicated switch, etc., and during other operations, the scale is displayed in the normal character display area. A scale display method characterized by displaying characters.