JPS5847712B2 - Dot matrix display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display method of a dot matrix display element that displays intersections of selected row and column electrodes from a group of electrodes arranged in a matrix in the row and column directions and facing each other. .

Conventionally, a method is known in which input information is displayed using this type of display element by applying a signal to the row electrodes and sequentially scanning the column electrodes in a time-sharing manner.

That is, the display element 1 shown in FIG. 1 has row electrodes 2 parallel to each other (hereinafter, suffixes will be omitted unless a specific one is shown).

) and mutually parallel column electrodes 3 orthogonal to each other, and each matrix intersection of the row and column electrodes forms a display cell 4.

Further, each electrode of the row electrodes 2 is connected correspondingly to each output terminal of the row driver 8, and each electrode of the column electrodes 3 is correspondingly connected to each output terminal of the column driver 10.

On the other hand, input data to be displayed is supplied from an input terminal 5 to a character generator 6, the output of which is connected to the input of a row driver 8.

Further, a clock pulse b for controlling the timing at which row and column electrodes are selected is supplied from a clock pulse generator 7 to a character generator 6 and a scan controller 9.
The output of the scan controller 9 is connected to the column driver 100 input.

It is now assumed that input data a consists of coded binary numbers.

This encoded input data a is decoded by the character generator 6 into a corresponding character, for example, a character pattern rAJ.

The character pattern is composed of, for example, 5 dots in the row direction and 7 dots in the column direction, and the signal corresponding to the 7 dots in the first column of the character pattern is sent to the character generator 6 by the first pulse of the clock pulse train b. The voltage is further stepped up to the drive voltage of the display element 1 in the row driver 8 to drive the row electrode 2.

On the other hand, the output from the column driver 10 is sequentially switched by a scan control section 9 controlled by a clock pulse b.
The first pulse of clock pulse train b produces a signal at the first output of column driver 10 to selectively drive column electrode 31.

That is, seven display cells 4 at the intersections of each row electrode and column electrode 31 are lit in response to the character pattern.

Similarly, when the second pulse of clock pulse train b is output, the row electrode 2 is driven by the pattern signal corresponding to the 7 dots in the second column of the character pattern, and at the same time, the column electrode 32 is driven to select 1. 7 of the intersection between these electrodes
The display cells 4 display characters corresponding to character patterns.

Thereafter, in the same manner, seven display cells in the column direction are sequentially lit in accordance with the character pattern.

If new input data a is input every time five clock pulses 7 are input, a plurality of characters can be displayed sequentially, and the display repetition cycle, that is, the refresh cycle, is set to an appropriate value that does not cause flickering, for example, 70 Hz. If selected appropriately, a plurality of characters can be displayed substantially simultaneously.

For example, 3 characters with a 5 x 7 dot configuration are displayed on display element 1.
When displaying two characters, row electrode 2 is selected among the electrodes necessary for display.
requires 7 electrodes, column electrode 3 requires 160 electrodes, and the third
The repetition period t of clock pulse b shown in figure a is 90μ.
sec, the refresh cycle is about 70Hz, or the refresh time T is about 14.3 msec.
c, and 32 characters can be displayed without flickering.

The display period of the display cell at the intersection of the selected row and column electrodes in FIG. 1 is equal to the repetition period t of the clock pulse b, which is 1/1 of the refresh time T.
60, and the average luminance of display element 1 is 1/16 of the instantaneous value.
This has the disadvantage that sufficient brightness cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to obtain a display method that lengthens the display period of a display cell at the intersection of selected row and column electrodes and increases the average brightness of a dot matrix display element.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3b.

FIG. 2 is a block diagram showing an embodiment of the present invention.

Among the row and column electrodes constituting the dot matrix display element 11, each row electrode 12 has a group of display dot electrodes 14 having the same shape and arranged at equal intervals, and three row lead electrodes each, and the column electrodes 13 are adjacent to each other. The structure has one column electrode for three rows of column direction display dot groups 14.

In other words, three dot electrodes and lead electrodes for one row of display cells? , each has one column electrode for three columns of display cells.

For example, row lead electrodes 12, 124, 127,...
...12.

, and the column electrodes 131, the seven display dot electrodes 14 in the first column can be displayed, and the row electrodes 123
, 126, 129, ... 122, and the column electrode 13
If 1 is selected, the matrix structure is such that seven display dot electrodes in the third row can be displayed.

It is now assumed that input data C is input at the same timing as in the conventional display method shown in FIG.

The input data C is input to the character generator 16.
It is converted into a character pattern, and its output is inputted to seven buffer registers 22 by a character sending pulse d from a character sending pulse generator 21.

The waveform diagram of the character feed pulse d is 3 as shown in Figure 3b.
It generates 3 high-speed Hals every 3 Kutsusoku pulses.

In other words, three high-speed pulses are used to
The pattern signals from the first column to the third column are sequentially recorded in seven buffer registers 22.

Next, the three outputs from each buffer register 22 are step-amplified in the row driver 18 to selectively drive the row lead electrodes 12, 122, 123, . . . Hals e
The column electrodes 13 are selectively driven by the first pulse, the scan controller 19, and the column driver 20.

That is, among the 21 display dot electrodes 14 constituted by the row electrodes 12 and column electrodes 13, display cells formed by each display dot electrode 14 corresponding to a character pattern are simultaneously displayed.

Next, in the same manner, the remaining four or five characters of the character pattern (the tear pattern signal and the flank signal in the 6th column for character spacing are serially connected to the seven bumper registers 22 by three high-speed pulses). The parallel output and the row driver 18 drive the row electrodes 12 with the second pulse of the scan pulse e, and the scan controller 19 and column driver 20 selectively drive the column electrodes 13 to generate the selected matrix electrodes. Display the selected display cells at the same time.

In addition, in the display element suitable for the dot matrix display method according to the present invention, as shown in FIG. 2, each column electrode is connected to at least two columns of display cells in the column direction, and is connected to the same column electrode. Each column-direction display cell is connected to a different row electrode, and has an electrode structure that forms a matrix independently of each other.

In the display system according to the present invention, when displaying 32 characters with a 5 x 7 dot configuration, 21 row lead electrodes,
64 column electrodes are required, the display period of the selected display cell is approximately 1/64 of the refresh time, and the average luminance of the dot matrix display element 11 is 1/64 of the instantaneous value, that is, the conventional The brightness can be increased by 2.5 times compared to the display method.

Furthermore, the input timing of the input data is the same as that of the conventional display system, and it has an excellent feature that it has compatibility with the conventional display system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional display method, FIG. 2 is a block diagram showing a dot matrix display element and its display method according to the present invention, and FIGS.
FIG. 2 shows a waveform diagram of a cross pulse and a character feed pulse in FIG. In the figure, 11 is a display element, 12 is a row electrode, 13 is a column electrode, 14 is a display cell, 16 is a character generator,
11 is a clock pulse, 18 is a row driver, 19 is a scan control section, 20 is a column driver, 21 is a character feed pulse generator, 22 is a buffer register, and 23 is a scan pulse generator.

Claims (1)

[Claims] 1. A row electrode group in which a plurality of row electrodes each having a large number of display dot electrodes are arranged in the row direction, and a column electrode group in which a large number of display dot electrodes are arranged in the column direction so as to face the row electrode group. In a dot matrix display method in which specific display dots are displayed by sequentially selecting them in a divided manner, the display dot electrodes are arranged in the same shape and at regular intervals in the matrix direction, and the display dot electrodes in each row are arranged at intervals of one or more. The display dot electrodes that are adjacent to each other in the row direction can be independently selected by connecting them so that they can be selected simultaneously, and the column electrodes are connected while simultaneously selecting the column electrodes that are opposite to the independently selectable adjacent dot electrodes. A dot matrix display method characterized by sequential selection in the row direction.