JPS6141189A - Controller for liquid crystal 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 Application of the Invention) The present invention relates to a display control device for a liquid crystal display device.

(Prior Art) FIG. 1 is a block diagram showing an outline of a conventional liquid crystal display device, in which (1) is a key switch, (2) is a character generator, and (3) is a liquid crystal display device (hereinafter referred to as LCD). It is. Conventionally, the fonts of letters, numbers, etc. to be displayed on the LCD (3) have been converted to 7-ont by a character generator (2) and then displayed on the LCD (3). In other words, the font (for example, A, B, C, etc.) on the LCD (3)
) is displayed on the LCD (3) as shown in Figure 2A.
It was sent from the character generator (2) every 8 horizontal dots in the display area.

By the way, depending on the font information such as the size of letters and numbers, figures, symbols, etc., it is often desired to display on the LCD (3) with, for example, 6 dots horizontally instead of 8 dots horizontally. However, if you try to display it on the LCD (3) using 6 horizontal dots, the font will change to the character generator (2).
l: Since every 8 horizontal dots on the LCD (3) are converted to 7 onts and sent as a display signal to the LCD (3), the left and right fonts overlap by 2 horizontal dots, and the displayed information on one side is This causes the inconvenience of being missing. That is, as shown in FIG. 2B, in the horizontal display area of the LCD (3), the font rA] is from 1 dot address to 6
Although the display area extends up to the dot address, the character generator (2) also uses the 7th and 8th dot addresses. Therefore, the font rB is next to the font rA].
When trying to display J, the LC that should be displayed with the font rBJ
The horizontal display area of D(3) is from the 7th dot address to the 12th dot address, but the display area at the 7th and 8th dot addresses has already been used by the display signal of the font rA].
Even if the display signal of the font rBJ is sent to the LCD (3) later, part of the display signal of the font rBJ corresponding to the display area 7 and 8 dot addresses of the LCD (3) will be invalidated.As a result,
As shown in Fig. 2C, part of the left side of the font "B" is missing.Similarly, when the font [C1 is displayed next to the font rBJ, the display of the font rBJ has already caused the 13.1
Since the display area of the 4-dot address is being used, part of the font [C1] to be displayed later will be missing.

In order to solve the above-mentioned inconvenience, conventionally, the horizontal display area of the LCD (3) is read, and as shown by diagonal lines in FIG. 2B, the overlapping display area when displaying the font [Aj is 7
, 8 dot address, and the font rBJ is displayed, the overlapping display area is the 13.14 dot address, and when displaying the font rAJ Display signal rA of character generator (2) corresponding to .8 dot address and 13.14 dot address
J, rB J's 7°87 ont address was masked.

In this way, conventionally, to display one font, the LC
I) Since the horizontal display area in (3) is read out and a part of the display signal of the character generator (2) is masked, the display processing becomes very complicated and takes a long time, and the display The shape could also be unnatural.

(Object of the Invention) An object of the present invention is to provide a control device for a liquid crystal display device that can eliminate the drawbacks of the prior art, speed up display on an LCD, and freely display the display form of fonts. With the goal.

(Summary of the Invention) The present invention processes a display signal representing a font to an LCD as information on a plurality of dots constituting the font, stores the display signal representing the font by each dot in a memory buffer, and stores each dot in a memory buffer. Since the font is displayed by giving the ``tut information signal to the LCD, it is possible to control and display each VγF that makes up the font, so the display on the LCD can be processed at high speed. The font can be displayed by freely changing the font for each dot.

To explain the present invention in detail, the present invention includes an information input means for inputting information such as letters and numbers, a display signal storage means for temporarily storing a display signal representing the font of information input from the information input means, A liquid crystal display means for displaying the font of the input information inputted by the information input means; and a liquid crystal display means for processing the font as a plurality of dot information constituting the font, controlling each dot information and giving it to the liquid crystal display means for display. and an arithmetic processing control means.

(Embodiments of the invention) Examples of the invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the electrical configuration of the present invention, and (3) is a block diagram showing the electrical configuration of the present invention.
D, (4) is a keyboard for inputting information such as letters, numbers, figures, etc., and issuing commands; (5) is a central processing unit (hereinafter referred to as CPU);
), (6) is a ROM containing a control program, (
7) is a memory buffer (RAM), and (8) is an LCD controller that receives display signals to drive and display the LCD (3). The display area of the LCD (3) is made up of a collection of dots, which are display pixels, and as shown in FIG.
...n) and the vertical address D jF" 1.2 +3 +
...ω) is determined.

Therefore, the position of each dot can be represented by an AiDj address, and the AiDj address corresponding to the position of each dot is initialized in the memory buffer (7) as shown in FIG.

Next, the present invention will be explained in detail.

When the power is turned on, the memory buffer (7) changes to the LCD (3).
) is initialized. Now, when the character "A" is entered as input information from the keyboard (4), the CPU (5) outputs the character rA.
The font J is stored in the memory buffer 7 as multiple dot information.
(7) is remembered. In the memory buffer (7), each dot information of the font is stored at an address corresponding to the position of each dot in a desired display area of the LCD (3), with one dot corresponding to one address. Additionally, the memory buffer (
Each dot information of the font rAJ stored in 7) is displayed on the LCD (
3) is sent to the LCD controller (8) for each dot information, in other words, for each address data.
The characters rAJ appear in the display area of D(3). Next, input the character rBJ from the keyboard (4), and CPtJ (
5), the font of the character rBJ is stored as a plurality of dot information at each address next to the dot information of the character rAJ in the memory buffer F(7). In addition, memory buffer T (7
) character rBJ dot information is LC for each dot.
D (3) via the LCD controller (8),
In the display area of the LCD (3), the character rB] will be displayed next to the previously displayed character I'AJ.Also, if you want to change the font already displayed on the LCD (3), for example, To change the already displayed letters rAJ mentioned above, add a new font to the keyboard (4)
The character 1°A] is stored as dot information at the memory address of the memory buffer (7) where it is stored as dot information, and the data for each dot is displayed on the LCD (
3), the LCD displaying the characters rAJ (3)
) A new font is displayed in the display area.

To move the fonts displayed on the LCD (3) to other display areas for each row or column, use the keyboard ( 4), the dot information data of the font in each row or column stored in the memory buffer (7) is moved to another address and stored, and the data at the destination address is also transferred to the LCD (3). ), and the fonts in each row or column are displayed in another display area.

(Effects of the Invention) As described above, the present invention can display characters, symbols, one figure,
Even when changing the font or moving the font on each line, the font is controlled as dot information on the memory puff 7 y (7), so it can be processed at high speed and the display format can be freely changed. can be displayed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the prior art, FIG. 2A,
2B and 2C are explanatory diagrams schematically showing conventional control displays, FIG. 3 is a block diagram showing an embodiment of the present invention, and FIG.
The figure is an explanatory view schematically showing the display area of the LCD (3), and FIG. 5 is an explanatory view schematically showing the storage address of the memory buffer 7 (7). 3...Liquid crystal display device (LCD) 4...Keyboard 5...CPU 7...Memory buffer 7

Claims (4)

[Claims] (1) Information input means, display signal storage means for storing a display signal representing the font of information inputted from the information input means, and liquid crystal display means for displaying the display signal stored in the display signal storage means. and an arithmetic processing control means for processing the display signal of the display signal storage means as a plurality of dot information constituting font information, controlling each dot information and giving it to the liquid crystal display means for display. A control device for a liquid crystal display device, characterized in that: (2) The control device for a liquid crystal display device according to claim (1), wherein the display signal storage means stores the font as information on a plurality of dots representing the font. (3) The display signal storage means stores display information to be displayed on the liquid crystal display means for each row or column.
) A control device for a liquid crystal display device according to item 2. (4) The arithmetic processing control means causes all or part of each row or each column of fonts displayed on the liquid crystal display means to be displayed in another display area of the liquid crystal display means, based on input information from the information input means. A control device for a liquid crystal display device according to claim (1), (2), or (3), characterized in that: