JPH06202608A - Electronic equipment - Google Patents

Abstract

PURPOSE:To make an underscored character display on the electronic equipment, which is equipped with a small-sized character mode LCD and constituted in consideration of portability, by an inexpensive means. CONSTITUTION:The electronic equipment is equipped with a function which is an LCD controller 5 for controlling characters displayed on a 5*7-dot or 5*10-dot LCD panel 7, and registers a font generated by underscoring the same character font as a character font to be displayed in a CGROM 5-3 incorporated in the LCD controller 5 and displays an underscored character by reading an underscored character code out of the CGROM 5-3 by adding a specific value to a character code of the same ununderscored character font when an input from an input device 1 is an underscored character.

Description

Detailed Description of the Invention

[0001]

The present invention relates to 5 * 7 dots or 5 dots.
* It relates to an electronic device in which a character mode LCD with a dot matrix of 10 dots can display an underlined character at a low cost.

[0002]

2. Description of the Related Art In recent years, many inexpensive LCD controllers for controlling a character mode LCD are commercially available. However, these LCD controllers do not have the ability to display underlines.

Here, in order to display an underline on a character using this character mode LCD, it is conceivable to use a cursor function.
However, using the cursor function is not practical because only one character can be underlined. Also, in order to display underline continuously, it is impossible to register the underlined character with bit expansion in the area released to the user in the RAM built in the LCD controller. is not. However, the released area is very small, for example, the number of characters that can be allocated is eight, and it is impossible to display the underline beyond the number of characters.

[0004]

Therefore, when an underlined character is displayed in an electronic device having a conventional character mode LCD, the first RAM for registering the character and each character underlined. Requires a second RAM for registering data for representing information as to whether or not the character has a character, and further, a character is bit-expanded from the data of the first and second RAMs and synthesized to display one screen. It required a third display RAM for registering the data after composition.

However, with such a configuration, the system becomes complicated, downsizing becomes difficult, and the cost becomes high, so that there is a problem that it is difficult to adopt in a low-priced electronic device in which portability is important. It was

[0006]

In order to solve the above-mentioned problems, the present invention has a CGROM in which a character font without underlining and a character font with underlining are registered in association with each other. A data conversion processing unit is provided which inputs designation information for line conversion processing and transforms a portion of the character code relating to the designation information into a character code with underlining.

[0007]

With the above construction, the input character code is first stored in the data registration section, and the character font (without underline) having this character code is displayed on the character mode LCD.

Next, when the designation information to be underlined is input from the displayed character font, the data conversion processing unit converts the portion of the character code relating to the designation information to the character code with underline. To do. As a result, the underlined character font in the CGROM is displayed for the portion related to the designation information.

Here, it is sufficient for the LCD controller to transfer the character font having the character code stored in the data registration section from the CGROM to the display RAM. In addition, these CGROM and display RAM
May both be built in the LCD controller. Therefore, an LCD controller capable of controlling an external display RAM and an LC having a display RAM for bit-expanding and combining a character and an underline and for registering data for one display screen
No D controller or the like is required. That is, a character mode LC that is generally commercially available and is inexpensive and small.
While adopting the D controller, a character with or without underline can be selectively displayed, and it is possible to realize an electronic device that is small, has good portability, and is inexpensive.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an electronic device equipped with a character mode LCD having a function of displaying an underline according to an embodiment of the present invention, in which 1 is an input device for inputting data and 2 is a CPU. 3 is ROM, 3-1
Is a data conversion processing unit for converting a character code without underline in the ROM 3 into a character code with underline, 4 is RAM, 4-2 is RAM 4
A data registration unit that internally stores text data (character code string) input from the input device 1,
4-1 is the data registration unit 4-2 inside the RAM 4.
Of the character codes stored in, the area registration unit for storing the designation information on the area to be underlined, 5 is a small and inexpensive LCD controller, 5-1
Is a data register for registering data from the CPU 2 inside the LCD controller 5, 5-2 is a display data RAM for registering display data inside the LCD controller 5, and 5-3 is a character font to be displayed inside the LCD controller 5. CGROM, 6
Is a driver, and 7 is an LCD panel.

FIG. 2 is a flow chart showing the flow of display data in this embodiment. (A) is a flow chart showing only character input, and (b) shows means for converting into characters with underline. It is a flowchart.

FIG. 3 shows an example of the contents of the data registration unit 4-2 of FIG. 1 in the present embodiment. 4-21 shows a character code string before underline conversion processing, and 422 shows underline conversion. The character code string after processing is shown.

FIG. 4 shows a data table of the CGROM 5-3 in which a font in which an underline is added to the same character font as the character font to be displayed in this embodiment is registered. 5-31 is a CGROM.
An area in which characters without underlines are registered in 5-3 is an area in which characters with underlines are registered in CGROM 5-3.

The operation of an electronic device having a function of displaying an underlined character on the small character mode LCD of the present embodiment configured as described above will be described below with reference to FIG. To do. Note that, in FIG. 2, the processing in the LCD controller 5 is shown in a broken line.

First, the character "ABCDEFGHIJK" without underline is displayed on the LCD panel LC.
D display address "00, 01, 02, 03, 04, 0
5, 06, 07, 08, 09, 0A "will be described. Data is input from the input device 1 (step 1), and the data is read by the CPU 2 and read.
Character code "4" in the data registration section 4-2 of AM4
1, 42, 43, 44, 45, 46, 47, 48, 4
9, 4A, 4B "are registered (step 2). The state of the data registration section 4-2 at this time is shown by 4-2 in FIG.
The character code registered in the data registration unit 4-2 is written in the data register 5-1 of the LCD controller 5 by the CPU 2 (step 3). The written character code is further displayed at the display address “00, 01, 02, 03, 0 by the function of the LCD controller 5.
4, 05, 06, 07, 08, 09, 0A ”is transferred to the display data RAM 5-2 (step 4), C
After bit expansion into character data by GROM5-3 (step 5), LC is passed via driver 6.
It is displayed on the D panel 7 (step 6).

Next, the input "ABCDEFGHIJ"
The procedure of converting "DEFGH" of K "into an underlined character and displaying it on the LCD panel 7 will be described. The input information of the underline conversion process (characters with underline) for" DEFGH "from the input device 1. Is input (step 11), and the CPU 2 first registers the underline conversion area "03, 04, 05, 06, 07" in the area registration unit 4-1 (step 12). Next, among the character codes of the data registration section 4-2 by the data conversion processing section 3-1 of the ROM 3, only the character code of the area of the area registration section 4-1 has a specific value "6".
0 "is added (step 13), and" A4, A5, A
6, A7, A8 ", the character code of the data registration section 4-2 is rewritten (step 14). The state of the data registration section 4-2 at this time is shown in 4-22 of FIG. The rewritten character code of 2 is written in the data register 5-1 of the LCD controller 5 by the CPU 2 (step 15) The written character code is further displayed at the display address "03,0".
Display data RAM5 corresponding to 4, 05, 06, 07 "
-2 (step 16) and converted into character data bit-developed by the CGROM 5-3 (step 17), but the character code at this time is only the underline is added to the original character without underline. CGR in such an arrangement that the displayed data becomes
Since it is registered in OM5-3, the character displayed on the LCD panel 7 via the driver 6 is "A,
B, C, D (underlined), E (underlined), F (underlined), G (underlined), H (underlined), I, J, K "
(Step 18).

As described above, according to this embodiment, CGRO
By having a character font with underline and a character font without underline at the same time in M5-3, it is possible to realize a small electronic device capable of displaying a character with underline on a commercially available inexpensive LCD controller 5.

[0018]

The electronic device according to the present invention is a CGROM.
In, the character font without underline and the character font with underline are registered in association with each other.Enter the designation information of the underline conversion process, and enter the portion of the character code related to the designation information. Since a data conversion processing unit for converting into an underlined character code is provided, an inexpensive LCD controller which is generally commercially available is used.
In a small and inexpensive electronic device, character display with or without underline can be selectively performed.

[Brief description of drawings]

FIG. 1 is a block diagram of an electronic device including an LCD according to an embodiment of the present invention.

FIG. 2A is a flowchart showing a flow of display data of a character in one embodiment of the present invention. FIG. 2B is a flowchart showing a flow of display data of an underline character in one embodiment of the present invention.

FIG. 3 is an explanatory diagram showing the contents of underline processing of the data registration unit in the embodiment of the present invention.

FIG. 4 is a diagram showing the contents of a data table of a CGROM according to an embodiment of the present invention.

[Explanation of symbols]

 1 Input device 3-1 Data conversion processing unit 4-2 Data registration unit 5 LCD controller 5-2 Display data RAM 5-3 CGROM 7 LCD panel

Claims (2)

[Claims] 1. A CGRO built in an LCD controller.
A character font is registered in M, and the character font is transferred to the display RAM built in the LCD controller based on the character code stored in the data registration unit, and the character mode LCD is displayed.
In the CGROM, a character font without underlining and a character font with underlining are registered in association with each other, and by inputting designation information of underline conversion processing. An electronic device comprising a data conversion processing unit for converting a portion of the character code related to the designation information into an underlined character code. 2. The electronic device according to claim 1, wherein the underlined character font in the CGROM has a character code obtained by adding a specific value to the character code of the underlined character font.