JPH06308904A - Display device - Google Patents

Abstract

PURPOSE:To provide a display device which can smoothly scroll by dividing a character font of one character and scrolling them by each divided part. CONSTITUTION:A character font of 5X7 dots constituting one character is divided into two parts and stored in a dot region of one character putting it aside in the direction of scrolling, in a ROM for a character generator, only three segment lines out of five segment lines of one character are successively connected to each segment electrode in a liquid crystal display section. Therefore, character fonts divided into two parts are combined and displayed as one character, when scrolling is performed by a character font, scrolling is performed by 3X7 dots, that is, by half character, then smooth scrolling is realized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a display device for smoothly scrolling a character displayed on a liquid crystal in a predetermined direction.

[0002]

2. Description of the Related Art Generally, a display device for displaying a character is adapted to perform so-called scrolling in which the displayed contents of the displayed character are moved horizontally or vertically.

As a display device for performing such scrolling, for example, in a conventional segment display type display device, as shown in FIG. 6, nine display areas A1 to A9 are formed by liquid crystal cells of 5 × 7 dots. When formed, the segment electrodes S1 to S5, S6 to S10, ... S41 are respectively formed on the segment electrodes of the liquid crystals in the display areas A1 to A9.
To S45 are connected to each segment line S1 to S
5, S6 to S10, ..., S41 to S45 are respectively supplied with voltages corresponding to display data from a drive circuit (not shown). The voltage corresponding to this display data is set based on the character font of the character read from the memory, and this character font is the liquid crystal of each display area A1 to A9 as shown in FIG. This is character font data for each character corresponding to the number of dots in the cell.

Therefore, in order to scroll the liquid crystal display in the horizontal direction (to the left in FIG. 7), the character font of the currently displayed character is changed by one character.
That is, the segment lines S1 to S5 and S6 to S moved in the scroll direction by one display area A1 to A9 of the liquid crystal.
10, ... S41 to S45 are supplied, the font for one character at the end of the scroll direction is deleted, the character font for one character to be displayed next is read from the memory, and the character font opposite to the scroll direction is read. Supply to the last display area A9 in the direction. As a result, at first, the display content shown in FIG. 7A is changed to the one shown in FIG.
One character is scrolled. When similar scrolling is performed, one character is scrolled as shown in FIG.

[0005]

However, in such a conventional display device, since the character font of the character is stored in the memory for each character and the scroll processing is performed as it is, the character font is scrolled by one character. And the scroll lacks smoothness. As a result, there is a problem that it is difficult to recognize the display content of the liquid crystal when scrolling.

In this case, if a so-called full-dot display device capable of displaying the liquid crystal on a dot-by-dot basis is used, dot-by-dot scrolling can be performed and the scrolling can be smooth. But you can
In this case, it is necessary to set display data for each dot, and there is a new problem that the display device itself becomes expensive.

Therefore, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a display device having a simple and inexpensive structure and capable of performing smooth scrolling.

[0008]

A display device of the present invention reads a plurality of character fonts from a storage means for storing character fonts of characters, displays the plurality of characters side by side on a liquid crystal, and displays the character fonts from the storage means. In a display device for scrolling the display of the liquid crystal in accordance with the display order, storing a character font obtained by dividing a character font for one character into a plurality in the scroll direction in the storage means, and for each of the divided character fonts. The data is read from the storage means, one character is displayed and output on the liquid crystal, and the display position on the liquid crystal is moved in the scroll direction for each divided character font to scroll the liquid crystal display for each divided character font. By doing so, the above object is achieved.

In this case, for example, as described in claim 2, the storage means stores a character font obtained by horizontally dividing a character font for one character into a plurality of characters, and stores each of the divided character fonts. Read out from the means and display and output one character to the liquid crystal, and horizontally move the display position on the liquid crystal for each of the divided character fonts to horizontally scroll the liquid crystal display for each of the divided character fonts. You may let me.

Further, for example, as described in claim 3, the storage means stores a character font in which a character font for one character is vertically divided into a plurality of pieces, and the storage means for each of the divided character fonts. Read out from the LCD, one character is displayed and output on the liquid crystal, and the display position on the liquid crystal is vertically moved for each of the divided character fonts to vertically scroll the liquid crystal display for each of the divided character fonts. May be.

Further, as described in claim 4, the storage means stores a character font obtained by horizontally dividing a character font for one character into two in a storage area for one character in a scroll direction. The segment line to be connected to the cell for one character of the liquid crystal is
Only the segment lines of the number corresponding to the divided width of the divided character font in the scroll direction may be sequentially and continuously connected.

[0012]

According to the display device of the present invention, a character font obtained by dividing a character font for one character into a plurality of characters in the scroll direction is stored in the storage means, and each divided character font is read out from the storage means to obtain one character. Minutes are displayed and output on the liquid crystal, and the display position on the liquid crystal is moved in the scroll direction for each divided character font to scroll the liquid crystal display for each divided character font. It is possible to scroll by a unit smaller than the character unit, and the liquid crystal display can be smoothly scrolled.

In the storage means, a character font obtained by horizontally dividing a character font for one character into two is stored in the storage area for one character in the scroll direction and connected to the segment electrode for one character of the liquid crystal. When the segment lines to be created are sequentially connected only by the number of segment lines corresponding to the divided width in the scroll direction of the character font obtained by dividing the character line into two, the existing character font for one character is stored as the storage means. It can be used and the storage means can be effectively utilized.

[0014]

EXAMPLES The present invention will be described below based on examples.

FIGS. 1 to 5 are views showing an embodiment of a display device of the present invention. In this embodiment, a segment type display is used.
This is applied to a display device that displays with × 7 dots.

FIG. 1 is a circuit block diagram of the display device 1, and the display device 1 is applied to a display device such as a facsimile machine or a copying machine.

The display device 1 includes an input / output circuit 2, an instruction decoder circuit 3, and a display data RAM (Random Access Memory).
y) 4, address counter 5, character generator R
An OM (Read Only Memory) 6, a segment timing synthesis circuit 7, a segment driver circuit 8, a liquid crystal display unit 9, a timing generation circuit 10, a common timing synthesis circuit 11, a common driver circuit 12, and the like are provided.
A character is displayed and output based on a display command from a microcomputer such as a facsimile machine or a copy machine.

In this embodiment, as shown in FIG. 2, the liquid crystal display section 9 has liquid crystal cells SL arranged to display 9 characters of 54 × 7 dots, and the segment electrodes of the liquid crystal cells SL are arranged. , A specific segment line S among the segment lines S1 to S90 from the segment driver circuit 8
Only 1 to S90 are connected.

In this embodiment, the character displayed on the liquid crystal display unit 9 is composed of a character font of 5 × 7 dots. In the liquid crystal display unit 9, the segment driver circuit 8 is used.
Each of the five segment lines S1 to S90 connected to is one character. That is, the segment lines S1 to S5, S6 to S10, ..., S86 to S90.
Are each a set for one character.

However, in this embodiment, as shown in FIG. 2, five segment lines S of each set of segment lines S1 to S90 connected to the segment driver circuit 8 are provided.
Only three of 1 to S5, S6 to S10, ..., S86 to S90 on the scroll direction side are connected to the segment electrodes of the liquid crystal SL, and the remaining two are not connected to the segment electrodes.

A common lead wire (not shown) is connected to the common electrode of the liquid crystal SL, and the common driver circuit 12 is connected to the common lead wire.

As will be described later, the liquid crystal display unit 9 controls the segment to be driven by controlling the common signal applied to the common lead-out line and the segment signal applied to the segment lines S1 to S90 to control one segment. Is divided into 6 × 7 dot liquid crystal cells SL for display output.

An interface signal line 13 for controlling the display device 1 with a microcomputer or the like is connected to the input / output circuit 2, and the interface signal line 13 is connected.
Is composed of a data bus, a read / write signal line, an enable signal line, a register selection signal line, a busy flag check signal line, and the like. The input / output circuit 2, based on the timing signal input from the timing generation circuit 10,
Various signals input via the interface signal line 13 and output direction control of data input from the display data RAM 4 and waveform shaping are performed and output to the instruction decoder circuit 3 and the display data RAM 4.

The instruction decoder circuit 3 decodes the instruction signal input from the input / output circuit 2, designates a specific address of the display data RAM 4, and outputs a character corresponding to the display data input from the input / output circuit 2. Address data of ROM 6 for character generator of code, RAM for display data
4 or write the address data to the address counter 5.

When the address data is input from the instruction decoder circuit 3, the address counter 5 increments the address value of the address data by "1" and the incremented address data is displayed in the display data RAM 4.
Output to.

In the display data RAM 4, the relationship between the address and the display position of the liquid crystal display section 9 is assigned. That is, the segment lines S1 to S5, S6 to S10, ..., S86 of each set of the liquid crystal cells SL of the liquid crystal display unit 9 are arranged.
An address is assigned every S90, and the display data RAM 4 has address data of a character code corresponding to the display data among the character fonts stored in the character generator ROM 5, and an address input from the address counter 5. The data and the character fonts of these addresses are used to set which segment line S1 to
Data indicating whether to display in the display area of the liquid crystal cell SL in S5, S6 to S10, ..., S86 to S90 is stored and is output to the ROM 6 for the character generator.

A timing signal is input from the timing generation circuit 10 to the display data RAM 4, and the display data RAM 4 stores the above addresses in synchronization with the timing signal. And the display data RAM 4
Sequentially reads the respective addresses written in this way and outputs them to the character generator ROM 5.

The character generator ROM 5 is shown in FIG.
As shown in FIGS. 5A and 5B, a character font obtained by vertically dividing the character font of the display character into two is 5 ×.
The size of 7 dots is stored in the storage area of 5 × 7 dots in the scroll direction. That is, in this embodiment, the character is composed of 5 × 7 dots, but this character is vertically divided into 3 × 7 dots and 2 × 7 dots, and as shown in FIG. The left 3 × 7 dot character font (shown in FIG. 3 (a)) and the divided right 2 × 7 dot character font (FIG. 3 (b))
Are written in the storage area of 5 × 7 dots, and are stored in the character generator ROM 5 at the left end. In FIG. 3, from the left side, “D”, “I”, “S”, “P”, “L”, “A”,
A character font of "Y" is vertically divided, and the left side 3x7 dots is stored in a storage area of 5x7 dots as shown in Fig. 3 (a). Is shown in FIG. 3B as a character font in a storage area of 5 × 7 dots.

Further, the ROM 5 for character generator
Is assigned an address to each of the divided character fonts, and this address is assigned to the display data RAM 4
Input from.

ROM 5 for character generator
When the address data of the character font is input from the display data RAM 4, the character font data corresponding to the address is read in synchronization with the timing signal input from the timing generation circuit 10, and the segment timing synthesis circuit 7 is read. Output to.

The segment timing synthesis circuit 7 expands the character font data input from the character generator ROM 5 into segment data and stores the segment data, and forms a selection signal based on the signal from the timing generation circuit 10 and the scan timing. And outputs it to the segment driver circuit 8.

The segment driver circuit 8 synthesizes the selection signal from the segment timing synthesis circuit 7 and the timing signal from the timing generation circuit 10 to form a segment signal for driving the liquid crystal display unit 9, and the segment signal Is output to the liquid crystal display unit 9.

On the other hand, the common timing synthesis circuit 11
Generates a common timing signal of the liquid crystal display unit 9 based on the signal from the timing generation circuit 10 and outputs the combined timing signal to the common driver circuit 12.

The common driver circuit 12 synthesizes the common signal of the liquid crystal display unit 9 based on the timing signal from the common timing synthesis circuit 11 and the signal from the timing generation circuit 10, and the common signal is synthesized in the liquid crystal display unit 9. Output to.

The liquid crystal display section 9 includes the segment signal from the segment driver circuit 8 and the common driver circuit 1.
By inputting the common signal from 2, the character fonts divided into two are combined, as will be described later, and 6 ×
One character is displayed and output in the area of 7.

Next, the operation will be described.

In the display device 1, when a display command from a microcomputer (not shown) is input from the interface signal line 13, the command decoder circuit 3 decodes the display command and the character generator corresponding to the display command. The character code of the character font of the ROM 5 for writing and the address input from the address counter 5 are written in the address corresponding to the display position of the liquid crystal display portion 9 of the RAM 4 for character display data.

Now, as shown in FIG. 4A, "DIS
If the character "PLAY C" is displayed and output,
The instruction decoder circuit 3 decodes this display data, decodes the address of each character font corresponding to this display character and the display position on the liquid crystal display unit 9, and the address of the display data RAM 4 corresponding to the display position. Then, the address data of the character generator ROM 5 of the character font is sequentially written, and the address data is output to the address counter 5. When the address data is input from the instruction decoder circuit 3, the address counter 5 outputs the address data obtained by incrementing the address by “1” to the display data RAM 4 and the display RAM 4.
Writes the address data input from the address counter 5 to an address corresponding to the next display position of the address data of the character font input from the instruction decoder circuit 3.

When the writing of the address data to the display data RAM 4 is completed in this manner, the display data RAM 4 sequentially outputs the address data to the character generator ROM 6 from the head address, and the character generator ROM 6 inputs. The character font written in the address of the generated address data is read and output to the segment timing synthesis circuit 7. At this time, the ROM 6 for the character generator is set in FIG.
As shown in (a) and (b), a character font for one character is vertically divided into two, and the respective character fonts are sequentially stored at consecutive addresses.
The continuous address data is input from the display data RAM 4 to the character generator ROM 6. Therefore, the character generator ROM 6 sequentially reads the left-side character font and the right-side character font of the two-divided character font and outputs them to the segment timing synthesis circuit 7.

The segment timing synthesis circuit 7 expands the input character font data into segment data in association with the display position, and outputs it to the segment driver circuit 8 as a selection signal. Segment driver circuit 8
Generates a segment signal based on the selection signal from the segment timing synthesis circuit 7 and the signal from the timing generation circuit 10, and outputs it to the liquid crystal display unit 9.

On the other hand, the common timing synthesis circuit 11
Outputs a timing signal to the common driver circuit 12, and the common driver circuit 12 synthesizes the common signal of the liquid crystal display unit 9 based on the timing signal from the common timing synthesis circuit 11 and the signal from the timing generation circuit 10. Then, it is output to the liquid crystal display unit 9.

When the segment signal and the common signal are input, the liquid crystal display unit 9 displays the character of the character font corresponding to the segment signal input to each liquid crystal cell SL based on the segment signal and the common signal. I do.

However, as described above, the character font stored in the character generator ROM 6 is
As shown in FIG. 3, with respect to the size (5 × 7) of the dot configuration for one character, the dot (3 × 7) half the size in the vertical and left sides has substantial dots. Further, the segment lines S1 to S90 are not connected to all of the segment electrodes of the liquid crystal display unit 9, and the segment lines S1 to S5, S6 to S10, ..., S86 of each set are formed.
First three segment lines S1 to S3 of S90 to S90,
Only S6 to S8, ..., S86 to S88 are connected to the segment electrodes.

Therefore, from the segment driver circuit 8, the segment lines S1 to S5, S6 to S10, ...
., Segment signals for 5 * 7 dots are output to the liquid crystal display unit 9 in response to S86 to S90.
5, ... S89, S90, the segment signals are the segment lines S4, S5 ,.
Since 0 is not connected to the segment electrode, it becomes invalid, and only the left 3 × 7 dots of the character font stored in the character generator ROM 6 is the liquid crystal cell S.
Input to L. As a result, on the liquid crystal display unit 9, the left 3 × 7 dots of the two character fonts divided into two and stored in the character generator ROM 6 are combined, and the character fonts for one character are displayed side by side. It At this time, as shown in FIG. 3, since the character font for one character divided into two is stored in the area of 6 × 7 dots, the combined character font for one character is composed of 6 × 7 dots. 1 between the character font for one character and the character font for the next one character.
Since a blank for x7 dots is formed, the character font can be displayed on the liquid crystal display unit 9 in an easily recognizable state.

Next, the case of scrolling the displayed character font will be described.

As described above, in the display device 1, when the display command from the microcomputer (not shown) or the like is input from the interface signal line 13, the command decoder circuit 3 causes the command decoder circuit 3 to operate.
The display command is decoded, and the address data of the character font of the character generator ROM 5 corresponding to the display command and the address data input from the address counter 5 are made to correspond to the display position of the liquid crystal display portion 9 of the character display data RAM 4. Write in the area.

When scrolling, one character stored in the display data RAM 4 by a scroll command, that is, the address data input from the instruction decoder circuit 3 or the address data input from the address counter 5 is used. Scroll each time.

That is, when a scroll command is input, the instruction decoder circuit 3 outputs a control signal to the address counter 5, and the output of the address counter 5 is incremented by "1". As a result, of the address data stored in the display RAM 4, the address corresponding to the position of the leftmost character font of the liquid crystal display unit 9 is updated. Thereafter, the address counter 5 is sequentially incremented by "1", and the address data stored in the display RAM 4 is updated by "1" each time. When the address data is updated by 18 characters (twice the number of display characters, which is 9 characters), this address data is output to the character generator ROM 6, and from the character generator ROM 6, the characters stored at the address of the address data are stored. The font is read out and output to the segment timing synthesis circuit 7. Then, as described above, the character font read from the character generator ROM 6 is displayed and output on the liquid crystal display unit 9.

Here, the ROM 6 for the character generator
, The character font for one character is divided into two
Since it is stored in the dot area for the character,
As shown in (b), only one character font of the character font divided into two is horizontally scrolled and displayed on the liquid crystal display unit 9. As a result, in this embodiment, as shown in FIG.
From (c) to (c), horizontal scrolling can be sequentially performed for one half character, that is, for every 3 × 7 dots. Therefore, scrolling can be performed smoothly, and the visibility of the liquid crystal display unit 9 during scrolling can be improved.

The character generator ROM
The form of the character font stored in 6 is not limited to the one shown in FIG. 3 in which the left half and the right half of one character are stored in the dot area for one character. , A character font for one character and a character font for the right half of one character,
May be stored. Also in this case, by the same processing as above, one character is displayed on the liquid crystal display unit 9 by combining the left side of the character font for one character in FIG. 6A and the right side character font in FIG. 6B. It is possible to do half of one character, that is,
It is possible to scroll by 3 dots. Thus, the character font for one character and the character font for the right half of one character are stored in the ROM for the character generator.
When stored in 6, it is only necessary to newly create and store the character font of the right half, and it is possible to easily create the character font.

In the above embodiment, when one character is composed of 5 × 7 dots, the character is divided into 3 × 7 dots and 2 × 7 dots, but the present invention is not limited to this. Alternatively, one character may have a larger dot configuration or a smaller dot configuration. Also, the dividing method is not limited to the method of dividing into two, and can be appropriately set as long as it is two or more. In this case, if the number of divisions increases, the number of character fonts to be created increases accordingly, but the scrolling becomes smoother.

Further, in the above embodiment, the case of scrolling in the horizontal direction has been described, but the present invention is not limited to this, and the same can be applied to the case of scrolling in the vertical direction.

[0053]

According to the display device of the present invention, a character font obtained by dividing a character font for one character into a plurality of characters in the scroll direction is stored in the storage means, and the divided character font is read out from the storage means. One character is displayed and output on the liquid crystal, and the display position on the liquid crystal is moved in the scroll direction for each divided character font to scroll the liquid crystal display for each divided character font. The display can be scrolled in units smaller than the character unit, and the liquid crystal display can be scrolled smoothly.

In the storage means, a character font obtained by horizontally dividing the character font for one character into two is stored in the storage area for one character in the scroll direction, and connected to the segment electrode for one character of the liquid crystal. Since only the segment lines corresponding to the divided width in the scrolling direction of the character font obtained by dividing the segment line to be divided into two are sequentially and continuously connected, the existing character font for one character is stored as the storage means. The storage means can be effectively used.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of an embodiment of a display device according to the present invention.

2 is an enlarged front view showing a state of segment wiring of the liquid crystal display unit of FIG.

FIG. 3 is a view showing a character font stored in a ROM for a character generator shown in FIG.

FIG. 4 is a diagram showing a scrolling state of the liquid crystal display unit of FIG.

FIG. 5 is a diagram showing another embodiment of the character font stored in the ROM for the character generator.

FIG. 6 is a diagram showing a state of segment wiring of a liquid crystal display portion of a conventional display device.

FIG. 7 is a diagram showing a scrolling state of a liquid crystal display unit of a conventional display device.

[Explanation of symbols]

 1 display device 2 input / output circuit 3 instruction decoder circuit 4 display data RAM 5 address counter 6 character generator ROM 7 segment timing synthesis circuit 8 segment driver circuit 9 liquid crystal display section 10 timing generation circuit 11 common timing synthesis circuit 12 common Driver circuit S1 to S90 Segment line

Claims (4)

[Claims] 1. A plurality of character fonts are read out from a storage means for storing a character font of a character, a plurality of characters are displayed side by side on a liquid crystal, and the character fonts are read out from the storage means according to a display order, and the liquid crystal In a display device for scrolling a display, a character font in which a character font for one character is divided into a plurality in the scroll direction is stored in the storage means, and the divided character font is read out from the storage means, and one character is stored in the storage means. A display device, wherein the display is output to a liquid crystal and the display position on the liquid crystal is moved in the scroll direction for each of the divided character fonts to scroll the liquid crystal display for each of the divided character fonts. 2. The storage means stores a character font in which a character font for one character is divided into a plurality of pieces in the horizontal direction, and the character font is read from the storage means for each of the divided character fonts, and one character is displayed on the liquid crystal. 2. The display according to claim 1, wherein while displaying and outputting, the display position on the liquid crystal is laterally moved for each of the divided character fonts so that the liquid crystal display is horizontally scrolled for each of the divided character fonts. apparatus. 3. The storage means stores a character font obtained by vertically dividing a character font for one character into a plurality of characters, and reads from the storage means for each of the divided character fonts, and one character is displayed on the liquid crystal. 2. The display according to claim 1, wherein while displaying and outputting, the display position on the liquid crystal is vertically moved for each of the divided character fonts so that the liquid crystal display is vertically scrolled for each of the divided character fonts. apparatus. 4. The storage means stores a character font obtained by horizontally dividing a character font for one character into two in a storage area for one character at a position shifted in the scroll direction, and stores the character font for one character of the liquid crystal. 3. The display device according to claim 2, wherein only the segment lines of a number corresponding to the dividing width of the character font obtained by dividing the segment line to be connected to the cell in the scroll direction are successively connected.