JPH0816147A - Information display device - Google Patents

Abstract

PURPOSE:To improve visibility at the time of making a character part dark and a background part bright as the emphasis part of a display character group in a dot matrix display device. CONSTITUTION:At the time of receiving and decoding a transmitted signal and of performing the transformation procession of a decoded signal to transform it into a display character pattern signal, a character pattern whose line width is thick is obtained by adding and processing the received origanl signal and a signal obtained by shifting the pattern of the received signal in a vertical direction and a horizontal direction or in an oblique direction on a display part. In the case the background part is made bright and the character part is made dark, since the character part is made not to be burried in the brightness of the background by extending the line width of the character, the character part is made to be clearly recognized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in the visibility of characters in a display unit in an information display device, when the brightness relationship between the characters and the background is reversed and displayed.

[0002]

2. Description of the Related Art A typical example of a signal system of a conventional dot matrix type information display device is shown in FIG. In the figure,
The input data passes through the data receiving circuit 1 and the received data is decoded by the data processing unit 2. That is, the data processing unit 2
Is a computer portion which decodes the transmitted signal and at the same time executes various processing such as generation of related control signals such as inversion and non-inversion of background and character lightness and darkness by software.
A program for decoding the received data is stored in the ROM 3, and the RAM 4 is used as a temporary storage device for the data at the time of these processes. The signal decoded by the data processing unit 2 is the character signal generation circuit 5
Is converted into a required character pattern signal by. The obtained character pattern signal drives the respective display elements of the character display plate 7 in which the light emitting elements are arranged in a dot matrix through the display drive circuit 6. Here, conventionally, a method of inverting the lightness and darkness of the character portion and the background portion and displaying the portion to be particularly emphasized among the displayed characters has been often used. However, the thickness of the lines of the characters does not change, and if only the dark and light (black and white) are inverted, that is, when dark characters are displayed in a light background, the thin lines of the characters are affected by the light part of the background. It has long been known as a psychological effect that the visibility of letters is significantly reduced.

[0003]

As described above, in the conventional information display device, since the lightness / darkness relationship between the character portion and the background portion is simply reversed, the background portion is dark as shown in FIG. , If the text part is bright, it can be read clearly, but if the relationship between light and darkness is reversed, thin lines of the text part will appear thinner and become difficult to read in the case of characters of the same thickness in the background brightness. It has been a problem to cripple the perception of. Therefore, it is required to improve the visibility when performing the reverse display.

The present invention has been made in order to solve the problem of the display effect in the conventional device as described above.
An object of the present invention is to provide a display device that can perform bright and dark reverse display without impairing visibility.

[0005]

In order to achieve the above object, in the present invention, the case of performing the bright and dark inversion display is shown in FIG.
As shown in, the displayed character is shifted vertically or horizontally, or diagonally by 1 dot or more on the display unit, and by overlapping this with the character before the shift, the line width of the displayed character is effectively expanded and visibility is improved. To improve.

[0006]

The above processing can be executed in the data processing unit 2 by the software incorporated in the ROM 3 shown in FIG. Alternatively, by providing a shift register group in the display unit drive circuit 6, temporarily storing the characters before and after the shift process and adding the outputs thereof by the OR circuit, the same process is performed at the hardware stage. You can do it. The processing operation in this case is the data processing unit 2
It is controlled by the light-dark reversal signal obtained in.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 4 shows a flow chart of a processing procedure executed along the system diagram shown in FIG. 1 as a first embodiment of the present invention. FIG. 5 shows a correspondence relationship between a dot array of characters which is normally used and a shift register used as a temporary storage device. That is, one character is shown in FIG.
As shown in FIG. 5, it is composed of a dot matrix of 16-dot × 16-dot illuminant, and the shift register corresponding to these is composed of 16 columns of 2-byte shift register as shown in FIG. 5B. In FIG. 4, it is judged whether or not the received and decoded signal includes the character data as well as the inversion information regarding the brightness of the display. When included, it is attached as a flag to the character data. Next, the character data portion is sent to the character signal generating circuit 5 and set as a character code. Here, when the character signal has the inversion information attached thereto, the light and dark inversion processing is performed. The data is read out in the vertical direction in FIG. 5B, that is, in units of two sets of 1-byte shift registers (0 to 7, 0 to 7), which are sequentially read and written to the shift register group A. The shift register group A is 3 of the 1-byte shift register in FIG.
Refers to 2 sets. Next, the contents of the shift register group A are shifted to the positions of the adjacent shift registers corresponding to each bit, that is, shift register 1 → shift register 3, shift register 2 → shift register 4, and a new shift register group B is obtained. Written in. At this time, when the character data processing is started, since the previous data remains in the shift register for temporarily storing the previous character pattern, the content thereof is cleared to zero. The two sets of character pattern signals thus obtained are added up for each corresponding dot,
It is output as characters whose line width is expanded in the horizontal direction on the display unit. Further, the line width can be further expanded by providing a third shift register C and writing the contents of the shift register B as data shifted to a laterally adjacent position.

The bold characters thus obtained are output when the above inversion information is included, but when there is no inversion information, that is, when the character portion is bright and the background portion is dark, a character signal is generated. The non-inverted contents initially set in the circuit 5 are output as they are.

(Embodiment 2) As a second embodiment of the present invention, a case where the line width is expanded in the vertical direction on the display portion will be described. The character information decoded by the data processing unit 2 in FIG. 1 is supplied to the character signal generation circuit 5 and set as a character pattern signal. Next, an inversion signal of character brightness is detected on the display unit, and if there is an inversion signal, it is written in the shift register group A after the inversion processing of character brightness is performed. Up to this point, the procedure is the same as that shown in FIG. 4, but in the present embodiment, the contents of the shift register group A are shifted in the bit direction and transferred to the shift register group B. Therefore, each shift register of the shift register group B has a capacity of 1 byte and 1 bit or more (that is, 8 bytes).
Basically, more than one bit is required, but in reality, it is practically acceptable to discard only the one byte and the overflowed portion. By adding the contents of the two shift register groups (that is, the data before and after the shift), a character pattern whose line width is expanded in the vertical direction on the display unit can be obtained.

(Third Embodiment) A third embodiment of the present invention is obtained by combining the techniques of the first and second embodiments. That is, in this embodiment, by vertically and horizontally shifting the characters, the character pattern is diagonally shifted on the display unit to obtain a character which is spread in the same width in all directions. is there.

The above processing has been described in the case of being executed by hardware, but the data processing unit 2 in FIG.
It goes without saying that it can be implemented by software in.

[0013]

According to the present invention, when the lightness / darkness relationship between the character portion and the background portion is displayed in reverse in the light emitting type information display device, the visibility is improved by expanding the line width of the displayed character when the background portion is bright. It is possible to prevent the decrease, and it is possible to achieve a clear display regardless of the light-dark relationship.

[Brief description of drawings]

FIG. 1 is a signal system diagram of a conventional dot matrix type information display device.

FIG. 2 is a comparative diagram showing a change in visibility when the relationship between lightness and darkness of a character and a background is reversed according to a conventional technique.

FIG. 3 is a comparative diagram showing the effect of improving the visibility when the processing according to the present invention is performed.

FIG. 4 is a flowchart showing a signal processing procedure in the present invention.

FIG. 5 is an array diagram showing the relationship between the dot number distribution and the character data temporary storage shift register in the display unit of the dot matrix type information display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Data receiving circuit 5 ... Character signal generating circuit 2 ... Data processing part 6 ... Display part drive circuit 3 ... ROM 7 ... Display part 4 ... RAM

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Claims (1)

[Claims] 1. In a dot matrix type information display device, when displaying a light-dark relationship between a character and a background in reverse, the original display pattern and the original display pattern are vertically moved on the display unit.
It has means for temporarily storing the pattern signal shifted by at least one dot in either the left or right direction or the diagonal direction, and means for adding the outputs of these storage means and then outputting as a display signal. An information display device characterized by the above.