JPS62280794A - Control of character display - 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] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for controlling a character display device that displays characters in a dot pattern on a character display surface such as a Braun tube. In particular, display characters are specified as display attributes (Attributes).
e) Display character unit (U modifier) according to the code data, (
The present invention relates to a method of controlling the device for displaying modified characters (modification refers to inverting displayed characters, blinking, underlining, turning off, etc., and combinations thereof).

(Prior Art and Problems) Conventionally, there are known methods of modifying display characters in units of display characters using display character attribute code data, and methods of modifying display characters in units of display characters.

In the former method, it is necessary to modify each display character dot unit (=△), so it is necessary to modify between one dot display (usually several IQns), and the modification is executed (= is a circuit using high-speed logic elements). The problem is that it requires

In addition, in the latter method, in order to modify the displayed characters in units of displayed characters, the interval between displaying one character (usually several 1 oons) + U modification (= Therefore, it cannot be said that a high-speed logic element circuit is necessary, but The problem is that as many modification circuits as the number of horizontal dots of the displayed characters are required.

(Structure of the Invention) The present invention has been made in order to solve the above-mentioned problem, and the display character is displayed in unit of display character (= when modifying, the display character is "1" or "1"") by display character attribute code data. 0
This method was developed by focusing on the fact that only two values are taken, and the one-character display period and display character attribute code data remain unchanged. FIG. 1 shows an example of the configuration of a character display control device embodying the present invention. The block diagram, Figure 2, is a time chart for explaining the operation of Figure 1 (details will be explained later).As shown in the figure, the dot pattern of the displayed characters is formed in the cycle 1 before character display. “1” “0” dora Fxt:
Then, by inputting from the display character attribute code data memory S1, the dot data of the display character LO is executed. The result is then sent to the modified data storage circuit Go.
Temporarily memorize and 01 + d, character display execution cycle■
The modified " which is temporarily stored in GO and 01 when
The dot data of 1"O" is selected by inputting the display character "1" or 0° dot data S2 at the selection circuit H (=), and is output from the selection circuit H. This output is sent to the display device. Enter J to display the modified characters.The above is an overview, and the following (=details will be explained).

In FIG. 1, A is a video memory consisting of a display character storage memory section A1 and a display character attribute code storage memory section A2. B is a display character storage circuit whose input is connected to the display character storage memo J'AI, and stores the display character data by inputting the output (display character data) of the memory A1 in synchronization with the cycle of the character clock. C is a display character attribute code storage circuit which inputs the output (display character attribute code data) of the memory A2 in synchronization with the cycle of the character clock and stores the display character attribute code data. Note that the dot clock and character clock are supplied from a clock generator (not shown). Its operation will be explained with reference to FIG.

D is a character generator, which inputs the output data of the display character memory B in synchronization with the character clock cycle (= synchronized) and inputs it to E, which is the dot data of "1", "1", and "0" that forms the dot pattern of the display character. E is a parallel-to-serial (P/S) converter, which inputs parallel data of the character generator in synchronization with the character clock cycle (= synchronized with the dot clock cycle).
1" or "1" or "0" serial data 52 (=converted and outputted as a selection signal of the selection circuit H.

Fo and Ft form two display character modification circuits, which input the display character attribute code data S1 in the memories C and I in synchronization with the character clock (= synchronized with the character clock), and convert the dot pattern of the display character as shown in the operation description. FO and Fl each perform modification corresponding to the dot data of 0 and l to be formed.Next, GQ and Gl are both modification data storage circuits, and input the dot data of Oll modified by FO and Fl, respectively. and temporarily memorize it.

H is a selection circuit that selects the modified 1 or O dot data stored in Go and Gl in synchronization with the output of the parallel-to-serial converter E (display character 1).
．． 0 dot data) is selected and output by S2. J
displays modified characters from H on the display device.

(Operation of the invention) The operation of the circuit shown in FIG. 1 will be explained using FIG. 2.

First, display character storage memo JIA1i = the stored display character data is accessed in synchronization with the trailing edge (falling edge I) of cycle I of the character clock, and is stored in display character attribute code storage memo 9 to 2. The currently displayed character attribute code data is input to cycle I of the character clock.
The trailing edge (hereinafter referred to as "trailing edge" will be omitted) is accessed synchronously and manually stored in the display character storage circuit B and the display character attribute code storage circuit C, respectively.

Next, the display character data stored in the memory B+2 is input to the character generator D at the cycle of the character clock, and from this a dot pattern of display characters is formed.
Output dot data of "1" and "0" dot data. Next, "1" from character generator D,'
A dot data output of 0'' is manually set in the P/8 converter E in synchronization with the tick mark νH of the character clock.

On the other hand, the display character attribute code storage circuit C (: stores the stored display character attribute code data S1 in the display character modification circuit FO and Fir at the cycle of the character clock,
FO is the modification when the display character data is "0" dot data, and FL is the modification when the display character data is "1°".
Each character clock cycle is
This modified O and 1 dot data is sent to the modified data storage circuit Go at the trailing edge of the character clock cycle 2.
Gtt-temporarily memorize each.

During the character clock cycle ■, that is, the character display execution cycle ■ (-1, the dot data of 1 or 0 temporarily stored in the modification data memories Go and Gl is
A selection circuit H selects from the output of the converter E, that is, the display character 1 or O dot data 52t, and sends the modified 1 or O dot data to the display device J to display the modified character. Thereafter, the above-mentioned cycles I to (2) are repeated to continuously (=display modified characters).

(Effects of the Invention) In the present invention, as described above, in response to the dot data of 1 and 0 forming the dot pattern of display characters, 1.0
Since the modification of the dot data is performed during one character display period, a high-speed logic IC is not required as in the display character unit system. In addition, the number of modification circuits required for the number of horizontal dots, which is a disadvantage of the display character unit system, is not required, and only two modification circuits are sufficient.This results in lower costs, lower power consumption, and smaller equipment (= significant effect). There is.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a configuration example of a character display control device embodying the present invention, and FIG. 2 is a time chart explaining the operation of FIG. 1.

Claims (1)

[Claims] When displaying characters in a dot pattern on the character display surface and modifying each display character by display character attribute code data, in the first cycle before character display, the dots of the display character are The dot data of "1" and "0" forming the pattern can be modified by inputting the display character attribute code using two display character modification circuits, corresponding to the dot data of "1" and "0" of the display characters. and temporarily store it in two modification data storage circuits, and at the second cycle of character display implementation, modify the modified "1" and "0" dot data stored in the modification data storage circuits. , In the third cycle, serialized dot data of "1" or "0" constituting the display character is input, the selector selects and outputs it, and this output is input to the character display device to display the modified A method for controlling character display, characterized in that character display is performed for each character with a shift of one cycle.