JPH09288473A - Information display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a character in a visually satisfactory condition by writing a display pattern while shifting it in the up and down directions and in the left and right directions or in oblique directions by the amount of not less than one dot on a memory and finally writing a character in a first position where the character is not shifted while changing dot information to enable an edge forming in real time. SOLUTION: A character font is transferred from a host computer to be written into a RAM 2. A coordinate on which a character is made to be displayed at the outset becomes the address of a VRAM 3. The whole of a character is shifted from the coordinate in the right direction by the amount equivalent to one dot to be written in the RAM 3 with an edge forming color. Next, the character is shifted in the reverse direction to be written in the VRAM 3 by being overlapped. Moreover, the character is shifted in the up and down directions by respectively one dot to be overwritten. Finally, the character is returned to an original position to be written with a character color. After the processing of display characters equivalent to one screen is completed, a dot matrix-composite signal processing is performed by a DENC 4 and this signal is converted into an analog signal by a DAC 5 to be displayed on a CRT 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display character in an information display device and improving the legibility of the character when edging the character.

[0002]

2. Description of the Related Art A typical example of a signal system of a conventional dot matrix type information display device is described in, for example, Japanese Patent Application Laid-Open No. 8-16147. The input data passes through the data receiving circuit 1 and the data processing unit 2 decodes the received data. That is, the data processing unit 2 is a computer unit that decodes the transmitted signal and at the same time executes various processes such as generation of control signals related to background and characters, such as inversion and non-inversion by software. The ROM 3 stores a program for performing a decoding process of received data, and the RAM 3 is used as a temporary storage device for data in these processes. The signal decoded by the data processing unit 2 is converted into a required character pattern signal by the character signal generation circuit 5. The obtained character pattern signal is used for the display drive circuit 6
The light-emitting elements drive the display elements written by the character display plate 7 arranged in a dot matrix. Here, regarding the part of the display character that you want to emphasize especially, conventionally, as a method of reversing the lightness and darkness of the character part and the background part and a method of highlighting the display character itself, mainly the border of the character and the background is outlined in black. How to do it.

[0003]

However, in the above-mentioned conventional information display device, since it is necessary to store the framing information for the required number of characters in the memory, it is necessary to store the character font data. There was a drawback that the memory capacity was increased and that such special character font data had to be created in advance.
Further, there is also a problem that the characters and marks that have been telewritten cannot be bordered basically. The present invention
The present invention has been made in order to solve the problem in realizing the border display in the conventional device as described above, and an object thereof is to provide a display device capable of performing border display with a simple configuration without impairing the visibility.

[0004]

In order to achieve the above object, in the present invention, when edging is performed, a character to be displayed as shown in FIG. 1 is displayed on a memory by one dot vertically, horizontally or diagonally. It is intended to realize the edging of the display character by shifting and writing the above, and finally writing the character at the first position where the dot information is not changed and shifted.

[0005]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an information display device according to an embodiment of the present invention, and FIGS. 2A to 2E illustrate output examples using the information display device according to an embodiment of the present invention. FIG. 3 is a flow chart for explaining the operation of the information display device which is an embodiment of the present invention. In FIG. 1, 1 is an MPU for controlling the operation of the information display device, 2 is a RAM for storing a character font transferred from a host computer (not shown), and 3 is a predetermined character information from the RAM 2. VRAM, which is extracted and written, is a DENC for converting the dot matrix data on VRAM 3 into a composite signal.
An information processing device is composed of a DAC (referred to as a digital encoder) 5, a DAC for converting a digital signal into an analog signal, and a display device 6 such as a CRT. The operation of the information processing apparatus of the present invention will be described with reference to FIGS.

When all the necessary character information has been written on one screen from the RAM 2 storing the character font transferred from the host computer, VRA is completed.
The character information of M3 is converted from dot matrix information into a video signal by the digital encoder 4, and displayed on the CRT 6 by the DAC 5. A method of writing data in the VRAM 3 at this time will be described with reference to FIGS. As a means for allocating the color included in the character information for each dot, 2-bit information is given to each dot. With this you can assign 4 colors to 1 dot,
One of them is colorless, that is, it is assigned as a dot on which no characters are drawn. Now, a method of displaying the character "A" will be described. First, a character font "A" is transferred from a host computer (not shown) and written in the RAM 2 (S1). As shown in FIG. 2A, the coordinates at which the character is first displayed, which is the address of the VRAM 3. The entire character is shifted to the right by one dot from this coordinate and written in the VRAM3 in the border color (S2). Next, as shown in FIG. 2 (b), contrary to the above, it is shifted to the left by one dot and written over the VRAM 3 (S3). Further, the upper and lower sides are shifted by one dot, and the overwriting is performed in the same manner (FIGS. 2C and 2D). This operation is S4 shown in FIG.
And S5. Finally return the coordinates to their original position,
When writing in the character color, the display of the character "A" is completed (Fig. 2 (e)), and after the number of display characters for one screen is processed (S6), the DENC 4 shown in Fig. 1 causes the dot matrix (DMD) to be displayed. ) -Composite signal processing is performed (S7). This composite signal is shown in Figure 1.
The digital signal is converted into an analog signal by the DAC 5 shown by (S8) and displayed on the CRT 6.

[0007]

As described above, according to the present invention, the original display pattern is written in the memory by shifting it by one dot or more vertically, horizontally or diagonally, and finally the character is set at the first position where the dot information is not changed and not shifted. By writing, the character data or telewriting, pointing marks, and other arbitrary input figures can be displayed in a framed manner in real time on the dot matrix display device, and the display can be realized in a visually favorable state.

[Brief description of drawings]

FIG. 1 is a block diagram of an information display device that is an embodiment of the present invention.

2A to 2E are diagrams illustrating an output example using the information display device according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating the operation of the information display device that is an embodiment of the present invention.

[Explanation of symbols]

 1 MPU 2 RAM 3 VRAM 4 DENC 5 DAC 6 display device

Claims (1)

[Claims] 1. In a dot matrix type information display device, when displaying a display pattern such as a character by edging, a memory for holding an original display pattern with an information amount of 2 bits or more for each dot and its memory are provided. By writing the original display pattern on the memory by shifting it by at least one dot in the vertical, horizontal, or diagonal directions, and by adding color information to the memory written by shifting the dot by one dot or more. An information display device characterized by being trimmed and displayed.