JPS5933160Y2 - fluorescent display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent display device that displays bar graphs in multiple colors.

This type of fluorescent display device is used in automobile instrument panel instruments such as speedometers and tachometers, and other various instruments. Conventionally, a fluorescent display device that displays a bar graph in three colors, for example, is shown in Fig. 1. As shown in the figure, a bar-shaped luminescent segment N , ~1−n (where n is an arbitrary number) coated with a blue-green phosphor, and a bar-shaped luminescent segment coated with a yellow phosphor as well. Luminous segment 2-1
~2-n and bar-shaped light emitting segments 3-□~3-n made of red phosphor are respectively placed on the same glass substrate (
(not shown) and these bar-shaped light emitting segments 1-□~1, . 2-0~2. and 3-1 to 3-n are driven to emit light based on the level value of the input signal, producing a blue green color.

The bar graph is displayed in yellow and red.

However, in the fluorescent display device with the above configuration, in order to obtain the same brightness for the three colors, the voltage between the electrodes of each light emitting segment is approximately 20 V for the blue-green light emitting segment, and approximately 50 V for the yellow light emitting segment, and approximately 50 V for the red light emitting segment. The light emitting segments of the two have a large difference of about 60V.

Therefore, as the drive voltage of the drive circuit that drives each of the above light emitting segments, the light emitting segments 1-1 to 1
-n drive voltage is 20V, the drive voltage of light emitting segments 2-□ to 2-n is 50V, and the drive voltage of light emitting segments 3-□ to 3-n is 6°■. The drive circuit became complicated due to the balance.

Furthermore, a dynamic drive circuit that requires the same drive circuit cannot be used, and bar graph displays with a large number of light-emitting segments have the disadvantage that it is practically difficult to display them in color.

The present invention was devised in view of these points, and its purpose is to simplify the drive circuit when displaying bar graphs in multiple colors, and to provide a fluorescent display device that makes the display easier to read. There is a particular thing.

In order to achieve such an object, the fluorescent display device of the present invention includes a bar graph display section in which a large number of bar-shaped light emitting segments are juxtaposed on the same substrate and are arranged in one direction and emit light in the same color; A scale display section is provided on the same plane as the bar graph display section, and a scale display section consisting of a plurality of scale lines that emit light in different colors is arranged adjacent to the bar graph display section and along the arrangement direction of the bar-shaped light emitting segments. The scale line is made to emit light according to the number of emitted light segments of the shape.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a schematic plan view of the main bar graph display portion of an embodiment of the fluorescent display device according to the present invention.

In this embodiment, a bar graph display section 10 in which a large number of bar-shaped light-emitting segments N1, . A scale display section 12 in which scale lines 13, 14, and 15 are arranged in a row on the same plane and in close proximity to each of the light emitting segments N11 to 11-n is constructed in an ordinary fluorescent display tube, and each light emitting segment segment 11
-□ to 11-n are coated with a phosphor that emits blue-green color, and display a bar graph in blue-green color corresponding to the level value of the input signal.

The scale line 13 of the scale display section 12 is coated with the same phosphor as the light emitting segments 11-1 to 11-n, the scale line 14 is coated with a phosphor that emits yellow, and the scale line 15 is coated with a red phosphor. These scale lines 13~ are coated with phosphors that emit light.
The light emitting segments 11-□ to 11-n are driven in accordance with the level value of the input signal to display a scale display.

According to the fluorescent display device configured in this way, in the bar graph display section 10, for example, the light emitting segment 11-1
~11-k is the first section for the input signal, the light emitting segment 11- is the second section, and the light emitting segment 11-t is the second section)
Assuming that 11-t to 111 are each divided into third divisions, in the case of an input signal corresponding to the first division, the scale line 13 of the scale display section 12 emits blue-green light and the light emitting segment) 11 ,~11-k
This enables bar graph display.

In addition, in the case of an input signal corresponding to the second category, the scale lines 13 and 14 change while emitting blue-green and yellow colors respectively.
- to ~11-t enables bar graph display.

Furthermore, in the case of an input signal corresponding to the third division, the scale lines 13 to 15 emit light in blue-green, yellow, and red, respectively, while the light emitting segments 11-1 to 11-1
1 k, 1.1-to ~11. 4. 11 7-11
-n enables bar graph display.

Therefore, according to the above embodiment, the bar graph display section 1
Each of the light emitting segments 11-1 to 11-n of 0 has the same drive voltage (approximately 20
In addition to being able to drive the scale lines 14 and 15 of the scale display section 12 with two types of drive voltages (approximately 50 V).

60V), the drive circuit can be extremely simplified.

In addition, each light emitting segment 11- of the bar graph display section 10
1 to 11-n can also be dynamically driven.

Furthermore, each light emitting segment N1 1 of the bar graph display section
~11-n and each scale line 1 of the scale display section 12
By arranging 3 to 15 on the same plane, the boundaries of the bar graph display section are not affected by parallax, compared to, for example, a case in which colored filters are attached to the surface of a fluorescent display tube. , the displayed value on the bar graph display section can be read accurately.

Although the above-mentioned embodiment shows the case where the bar graph display is performed in a linear display format, the present invention is not limited to this.
As shown in FIG. 3, bar graph display can also be performed in a circular display format.

Furthermore, the display color of the scale display section is not limited to those of the above embodiments, and can be arbitrarily selected, and the display form of each scale line can also be made to emit light at all times.

In FIG. 3, the same reference numerals as in FIG. 2 indicate corresponding parts.

As explained above, according to the fluorescent display device of the present invention,
Since each light emitting segment of the bar graph display section can be driven with the same drive voltage, and only the scale lines of the scale display section can be statically driven with different voltages, the drive circuit can be extremely simplified.

Further, by arranging each light emitting segment of the bar graph display section and each scale line of the scale display section on the same plane, it is possible to accurately read the displayed value of the bar graph display section.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view of a bar graph display portion showing an example of a conventional fluorescent display device, and FIG. 2 is a schematic plan view of a main bar graph display portion showing an example of a fluorescent display device according to the present invention. It is a top view and a figure showing a modified example. 10... Bar graph display section, Fig. 3 shows 1 □~11-n... Bar-shaped light emitting segments, 12... Song scale display section, 13-15... ...Scale line.

Claims (1)

[Scope of utility model registration request] A bar graph display section in which a large number of bar-shaped light emitting segments are arranged side by side on the same substrate and emit light in the same color in one direction; and a scale display section consisting of a plurality of scale lines that are arranged along the arrangement direction of the light emitting segments and emit light in different colors, and the scale lines are made to emit light according to the number of light emitted from the bar-shaped light emitting segments. A fluorescent display device characterized by: