JPS62269195A - String display unit - 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 [Field of Industrial Application] The present invention relates to a character string display device, and more particularly to a character string display device that displays a character string including the character at the cursor position.

[Conventional technology] Conventionally, CRT displays, liquid crystal panels, EL panels,
In character string display devices that display multiple characters in a dot matrix on a display unit such as a plasma display,
A cursor is displayed together with characters as an indicator indicating the position of the indicated point. Although various methods of displaying the cursor have been proposed, generally a display device is used in which the cursor is displayed as an underline under a character, or as a blinking or inverted character at the cursor position.

[Problems to be Solved by the Invention] However, the display of the cursor in such a character string display device does not pose a particular problem when the display has a large display section such as a CRT display and the degree of freedom in displaying characters and cursors is high. However, when the display section is small, there are the following problems, and further improvements have been desired.

(1) A display device using a display unit with a small number of display digits can display only a part of the character string in the - line.

Therefore, when displaying a character string that includes the character at the cursor position, it is completely unclear how the character is arranged in the whole, making it difficult to edit the text. Ta.

(2) In a display device using a display section with a small number of dots in the character height direction, when a cursor is displayed using an underline display, there is a problem that the cursor cannot be distinguished in areas where the normal underline display is displayed. there were. Also,
On the other hand, blinking and inverted display made the cursor too conspicuous and could interfere with editing work.

The present invention has been made to solve these problems, and provides a character string display device that can suitably display a character string including the character at the cursor position.

[Means for solving the problems] In order to achieve the above object, the present invention has the following configuration as a means for solving the problems. That is, the character string display device of the present invention includes a display unit that displays a part of the character string stored in a storage means in a dot matrix, and a display unit that displays a predetermined number of characters including the character at the cursor position in the character string. , a first display means for displaying on a part of the display section by a dot pattern constituting the character; and a dot pattern constituting one character, which displays the characters of the character string before and/or after the displayed character. and a second display means for displaying a dot pattern on the display section that is different from the dot pattern.

[Operation] In the character string display device of the present invention having the above configuration, when displaying a part of the character string stored in the storage means on the display section using dot matrix, the first display means selects a part of the character string at the cursor. A predetermined number of characters, including the character at the position, are displayed on a part of the display section using dot patterns forming the characters, and the second display means displays the characters before and after the characters displayed by the first display means. / or the characters in the following string with the dots and dots that make up those characters.
It is displayed on the display section using a dot pattern different from the pattern.

Therefore, if the dot pattern of the characters displayed by the second display means is made smaller than the dot pattern constituting one character, more characters can be displayed on the display section. Also,
By displaying these characters using a dot pattern obtained by erasing a part of the dot pattern constituting one character, characters other than the character at the cursor position can be displayed in an inconspicuous manner.

[Embodiment] In order to further clarify the configuration of the present invention described above, an electronic typewriter having a character string display device as a preferred embodiment of the present invention will be described.

FIG. 1 is a perspective view showing a schematic structure of this electronic typewriter 1, and FIG. 2 is a block diagram showing its electrical system.

As shown in both figures, this electronic typewriter 1 takes a character string input from a keyboard 2 into an electronic control unit 3, stores it, displays it on a liquid crystal panel 4, and displays the stored character string. , simultaneously with the input or in response to a predetermined keystroke, on the paper 8 mounted on the platen 6.
Printing is done using a thermal transfer method. In this embodiment, it is assumed that the electronic typewriter 1 mainly handles English text.
The keyboard 2 also has an arrangement for English text.

When the electronic typewriter 1 prints, the electronic control device 3 controls the position of the printing carriage 16 in the row direction by driving the stepping motor 18, and sends print information to the print head 19 mounted on the printing carriage 16. Output. The printing carriage 16 is slidably supported by a guide shaft 20 provided parallel to the platen 6, and is driven in the axial direction of the platen 6 via a toothed belt 22 by rotation of the stepping motor 18. The print head 19 has a plurality of heating elements (not shown) and melts the pigment of the thermal transfer ribbon 24 mounted on the print carriage 16 to thermally transfer and print. Print information is output to the print head 19, which is moved along the platen 6, by a flexible printed board (not shown).

As shown in FIG. 2, the electronic control device 3 is a well-known CPt
J31, R for storing control programs and data in advance
It is constructed as a logical operation circuit from an OM 32, a read/write RAM 33, a line memory 34 that stores one line of character strings to be displayed on the liquid crystal panel 4 in a corresponding dot configuration, and the like.

The CPU 31 performs the following input/output processing while temporarily reading and writing necessary data in the RAM 33 according to a procedure (program) stored in the ROM 32. Namely (1) Keyboard input/output circuit 3
(2) Drive the stepping motor 18 via the print drive circuit 36 to drive the print head. (3) When one line of printing is completed, the stepping motor 18 is driven to print. (4) The process of returning the paper carriage 16 to the home position (left end) and driving the line feed motor (not shown) to rotate the platen 6 and feed the paper 8 by one line; (4) the process of feeding the paper 8 by one line; This process includes writing necessary information into the line memory 34 and displaying it on the liquid crystal panel 4 by the movement of the panel drive circuit 37 that reads it cyclically.CPU
31 transfers necessary data etc. to the ROM 32.32 via the bus 41.
RAM33. Line memory 34. Keyboard input/output circuit 35. The above-mentioned processing is realized by mutually removing the sharpness with the print drive circuit 36 and the like. control.

Note that the line memory 34 is for storing characters etc. displayed on the liquid crystal panel 4 using their dot patterns.
The panel drive circuit 37 displays the contents of the line memory 34 on the liquid crystal panel 4 as is. That is, the display on the liquid crystal panel 4 is performed using a so-called bitmap display method.

Next, among the above-mentioned processes, particularly the process for displaying characters for editing will be explained using the flowchart of FIG. The electronic typewriter 1 according to the embodiment usually has the following features:
As shown in Fig. 4 (A>), 24 characters are displayed on the liquid crystal panel 4, each character being 6 dots (1 dot space) horizontally.
Displayed in a dot matrix of 8 vertical dots (1 dot underline). On the other hand, when the editing mode is specified, the editing character display routine shown in Figure 3 is executed, and as shown in Figure 4 (B), the display of six characters before and after the cursor position remains unchanged. , and other characters are displayed as 2 dots horizontally and 5 dots vertically, for a total of 60 characters (one line in normal letter size).

This editing character display routine is repeatedly executed until the editing mode is canceled, and the key input from the keyboard 2 is taken in (step 100), and the key images are changed to the left and right cursor keys (cursor keys 21 and 2R in Fig. 1). ) (step 110), the cursor position in the text in the RAM 33 is moved forward or backward by one character (step 120). On the other hand, if the key image is a normal character (step 110), this is replaced in the RAM 33 with the character on the text corresponding to the cursor position (step 130), and the cursor is moved one character within the text. (Step 140).

After moving the cursor (step 120 or step 140), the characters from the beginning of the line to the fourth character before the cursor are stored in the line memory 34 in a pattern of 2 dots 1 to ×5 dots.
Then, processing is performed to expand the data within (step 150). This dot pattern may be prepared in advance in the ROM 32, or may be generated from a normal character pattern. Next, a total of 6 characters before and after including the cursor position (in this example, "brO
wn '6 letters of J) to the dot pattern of that letter (
6x8) in the line memory 34 (step 160). Then, from after these 6 characters (3rd character after the cursor) to the end of the line, do 2 dots x 5 again.
The dot pattern is expanded in the line memory 34 (step 170), the flow is transferred to rNEXTJ, and this routine is temporarily terminated. In addition, in step 110, when the key image is other than the left/right cursor or characters (for example, when it is a line feed key, up/down cursor key, or mode selection key, etc.), it can be handled similarly to rNEXTJ, and other images not shown in the figure can be used. In the processing routine, processing according to key human power, such as displaying a new line or canceling the editing mode, is performed.

Through the processing described above, in the editing mode, 60 characters for one line are displayed on the liquid crystal panel 4, and further 6 characters including the cursor position are displayed in a normal character pattern. Figure 4(B) shows this example.
When the cursor moves, the normal character pattern display also moves as shown in FIG. 4(C).

Therefore, character strings can be corrected while constantly checking the status of one line, and editing work can be performed extremely easily. Furthermore, since the cursor is always located within the six characters displayed in the normal character pattern, it is easy to visually recognize the cursor.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment in any way. For example, as the first display means, the same dot pattern (such as "■") may be used regardless of the characters. It goes without saying that the invention can be implemented in various ways without departing from the gist of the invention, such as a configuration using a dot pattern or a configuration in which the dot pattern is displayed in a cross-hatched pattern (see FIG. 5).

l'541 As detailed above, the character string display device of the present invention has the excellent effect of being able to suitably display a character string including the character at the cursor position with an extremely simple configuration. . For example, on a display unit that can display a predetermined number of characters, images of characters exceeding that number may be displayed along with multiple characters including the character at the cursor position, or the visibility of the character at the cursor position may be improved as needed. It becomes possible to display the information as sufficient. Therefore, character string operations such as editing can be facilitated.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an electronic typewriter having a character string display device as an embodiment of the present invention, FIG. 2 is a block diagram showing the electrical system thereof, and FIG. 4(A>, (B), and (C) are explanatory diagrams showing display examples of character strings, and FIG. 5 is an explanatory diagram showing display examples in other embodiments. The diagram shows: 1...Electronic typewriter 2...Keyboard 3...Electronic control unit 4...
・Liquid crystal panel 8...Paper 19...Print head 34...Line memory

Claims (1)

[Claims] 1. Part of the character string stored in the storage means is
a display section that displays in a matrix; and a first display means that displays a predetermined number of characters of the character string, including the character at the cursor position, on a part of the display section using a dot pattern forming the characters; , a second display means for displaying characters in the character string before and/or after the displayed character in a dot pattern different from a dot pattern constituting one character on the display section; . 2. The character string display device according to claim 1, wherein the second display means is configured to display the character using a dot pattern smaller than a dot pattern constituting one character. 3. The character string display device according to claim 1, wherein the second display means is configured to display the character using a dot pattern obtained by erasing a part of the dot pattern constituting one character.