JPS61107384A - display device - 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 [Technical Field] The present invention relates to a display device that outputs a pattern using a dot representation method.

[Prior Art] In recent years1, pattern output devices that can extremely easily form many types of patterns have become widespread.For example, such devices include dot refresh type CRT display devices, liquid crystal display devices, fluorescent display devices, etc. Examples include display tubes, etc. In dot refresh type CRT display devices, character and symbol patterns (hereinafter referred to as fonts) are generally accessed using codes, and the read fonts are used as video RA.
The data is stored once in M (hereinafter referred to as VRAM) and is read out repeatedly at high speed and displayed on the CRT.

In a text processing device using such a display device, when displaying or printing characters with thick lines (hereinafter referred to as bold) in order to emphasize the characters, conventionally a memory for storing 2 onts has been provided. However, in order to reduce memory capacity, the read font without a bold font is simply shifted about one dot to the left or right, ORed with the original font, and this data is transferred to VRAM to create the bold. It had come true. However, with this method, it may be difficult to distinguish characters using a font (e.g. 8 x 16 dots) on a display device with a low resolution, such as a CRT display. mo.

If you explain it with a letter like “W”, (1) and (2) (
The display pattern shown in a) (lit dots are indicated by characters with diagonal lines) is shifted by 1 bit, and the display pattern shown in (b) is
) A display pattern (circle mark with diagonal lines + black circle mark) is formed. In this case, in the actual display, both the black circle mark and the circle mark including diagonal lines are lit in the same way, so there is a drawback that the display pattern cannot be identified, and furthermore, m and W cannot be distinguished.

[Objective] In view of the above points, it is an object of the present invention to provide a display device that has a small memory capacity and is capable of outputting bold characters in a beautiful and easy-to-identify pattern.

A further object of the present invention is to construct a display system that displays bold characters in a pattern that is easy to identify.

An object of the present invention is to provide an identification means for identifying attributes of a pattern, and to transform and display a part of a character pattern based on the result.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings. FIG. 2 is a block diagram showing the main functional configuration of a dot refresh type CRT display device (hereinafter referred to as a display device) according to an embodiment of the present invention. It goes without saying that this display device can be connected to any electronic device such as an electronic typewriter or workstation.
CPU), and the pattern to be displayed on the display section 3 is
For example, whether or not the character is an emphasized character is outputted to the display control unit 4, which will be described later. 2 is the 1° common bus of the CPU, 3 is the CRT display section using the rusk scanning display method, and 4 is the display control section, which identifies data from the CPU and refreshes the CRT display section 3 with appropriate dots such as bold characters, normal characters, etc. Outputs method pattern information. Note that in the CPUI, the attributes of the input data (what is the pattern?

In addition, the data is transferred to the display control unit 4, and the display control unit 4 selects the C character accordingly.
The intelligent display control unit 3 unit 4 may only control the RT display unit, or may be considered as a form in which the display control unit has another CPU on the display side.
The data from I may be recognized and identified, and the display unit 3 may be controlled based on the result. Therefore, the identification means for identifying the attributes of the pattern may be located on the CPU side or on the display control means side. A repeatedly readable video RAM 6 is a ROM containing control procedures (area 6-2) and font information (area 6-1) for the present invention.

The following numbers with °H' after them represent IB decimal numbers. In the example, the code system is based on ASCII, but the font information is continuous from address FCOOOH in code order every 16 bytes for one character. For example, the lowercase 1ml font displayed as shown in Figure 1 (1) (a) is stored in the ROM 6.
DH, but in order to display this lowercase letter “mo”
Since 6 bytes of data is required, FC000H+6
DH 16 = 16 bytes starting from the address of FC6DOH, 000H, 0OOH, 0OOH, 0OOH, 0OOH,
0OOH, 028H.

0134H, 054H, 054H, 054H, 054H
,0OOH,0OOH.

It contains the values 00QH, 0OOH, 0OOH (the 16 horizontal lines in (a) of FIG. 1(1) are expressed as binary values, with circles including diagonal lines being 1 and others being 0).

The configuration of the internal registers of the CPUI is shown in Figure 3, where AX is a 16-bit register, and A indicates the upper 8 bits.
It consists of an AL register indicating H and lower 8 bits. The same applies to BX, CX, and DX below. Also, Si is 2
A 0-bit register (not limited to this, and may be 1.16 bits, etc.) is used as an address pointer. The explanation of the register will be described later. Figures 4 and 5, which describe the procedure for displaying the lowercase letter = ml in bold in the above configuration of the 0th order, are control flowcharts for bold display in the case of the lowercase letter ゛m°. be. First, in step 1 of FIG. 4, as mentioned above, the font information start address (FC[1DOH) of the lowercase letter m+ is stored in the address pointer register Si in step 1. Then, in step 2, the font information start address (FC[1DOH) for the - character is stored in the address pointer register Si. The number of bytes composing the font, .degree.18', is entered into the register DX shown in FIG. 3.Next, in step 3, the contents of the address pointed to by the register Si are entered into the register AL.

Next, in step 4, CALL MK-BLD-FNT
0 Next, in step 5.

The AL value generated in step 4 is transferred to VRAM. Then, in step 6, the value of register Sr is increased by 1 to indicate the next data, and then in step 7, the value of register DX is decreased by 1, and in step 8, it is determined whether DX has become 0.

- Determine whether all character data (16 lines) has been processed. If all the data for one character has been completed (YES in step 8), a bold display is obtained.

Next, FIG. 5 shows a flowchart explaining step 4 shown in FIG. 4 in more detail.

First, in step 1, clear the register CL, which is a counter for 8 pixels (1 byte) in the horizontal direction in FIG. It is stored in the register BX (16 bits since it is BH+BL) shown in the figure. Further, in step 3, the data from step 3 in FIG. 4 is saved, and the value of the AL register shown in FIG. 3 is copied to the AH register.

Next, in steps 4-7, the rightmost bit of the font is detected, in step 8, only that bit is shifted to the right, and in steps 9-10, OR is performed with the original data, and the bold data (if the character is For example, in Figure 8 (
2) As shown in FIG. 6, data in which only the rightmost bit of the font is thick, that is, the black circle is added) is obtained.

Specifically, the case of (a) in FIG. 1(1) will be explained. For example, the value of DX subtracted in step 7 of Fig. 4 is 8.
In this case, DX indicates the ninth row from the top with the symbol I. As shown in FIG. 7(1), when the symbol row is expressed as a binary value, it becomes '01010100'.

First, in step 4 of FIG. 5, the value of AL is shifted to the right by 1 bit (SHR), that is, as shown in FIG. 7 (2). In this example, it is O in step 5, so proceed to step 6, and select C.
Add +1 to L. Then, check whether CL>8 in step 8.
If the CL does not reach 8 bits in the horizontal direction of the character data (in the case of No), proceed to step 4 again.
If there is no carry 111 in all 8 horizontal bits, the answer is YES in step 9 and the process proceeds to step 8. In this example, as is clear from FIG. 7 (2) and (3), 3 bits are shifted in one row (CL= In 2), Carry becomes 1 for the first time.

At this point, the answer to step 5 is YES for the first time, and the process proceeds to step 8.

BX:0080H explained in Figure 2 is (4) in Figure 7.
Near 3' (t Hlx data (BX=BH+BLJ:
In step 8, the data is shifted to the left one bit at a time by the value of CL (CL = 2 from above) (Fig. 7 (5)), and then in step 9 it is shifted to AHt-AL. The original data stored in step 3 of FIG. 4 is recalled.

In other words, °01010100' shown in (1) in Figure 7
, and in step 10 of FIG.
= 01010100 (Figure 7 (1)) and BH (top 8 figures of Bx after 2-bit shift) = 000
00010 ((6) in Figure 7) is ORed and 0101
Obtain data at 0110° (Fig. 7 (7)). In other words,
The data for polling for the line indicated by symbol work is as shown in FIG. 7 (7). Then, store that value in AL
Next, returning to the main program shown in FIG. 4, in step 5, the data shown in FIG. 7 (7) is transferred to the VRAM. The explanation from step 5 onwards in the main program is the same as above, and if the above procedure is repeated for all lines (16 lines) to make one character bold, the display shown in Figure 86 will be obtained (the I mark is displayed in bold). (The dot lights up to do this), so the details are omitted.

Similarly, if the letter S shown in Fig. 8 (1),
The bold characters (the φ mark is a dot that lights up for emphasis) as shown in FIG. From the idea of the present invention, it is naturally possible to make the line thick especially at the leftmost edge, upper side, or lower side (
Figure 8 [3].

(4), (5)), or even a combination thereof - The above procedure is effective for all characters, but depending on the character, bold characters may be displayed using conventional methods. 1. By combining the method according to the present invention and the conventionally used method, it is also possible to construct a display system that is easier to identify with a simpler configuration.

〔effect〕

As detailed above, according to the present invention, it is possible to provide a display device that can emphasize a part of a character with an extremely simple configuration, thereby displaying characters that are extremely easy to identify. Ta.

Further, according to the present invention, it has become possible to construct a display system that displays bold characters in a pattern that is easy to identify.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the conventional bold display of letters ゛m° and "W", Fig. 2 is a control block diagram of the display device, Fig. 3 is a diagram showing the configuration of the internal registers of the CPUI, Fig. 4 is FIG. 5 is a more detailed control flowchart for bold display. FIG. 6 is a diagram showing an example of hold display to which the present invention is applied. FIG. 7 is bold display for one line of data in a display pattern. FIG. 8 is an explanatory diagram of various bold displays for the letter "S".

Claims (2)

[Claims] (1) Display means for displaying a pattern; Identification means for identifying whether the pattern to be displayed by the display means is a special pattern that needs to be transformed; Based on the result of the identification means, the display means A display device comprising display control means capable of partially changing a pattern to be displayed. (2) The display device according to claim 1, wherein the special pattern is a pattern that requires thickening.