JPH06260117A - Fluorescent character display apparatus - Google Patents

Abstract

PURPOSE:To emit light with low brightness in the whole anode segments and further to emit light with high brightness selectively in the anode segments to provide display with high contrast without adding additional complicated driving circuit. CONSTITUTION:Regarding a fluorescent display apparatus using a fluorescent display tube 1, light with low brightness is emitted in the whole anode segments by ultraviolet rays 6 by installing an ultraviolet ray lamp 2 in the outside of the fluorescent display tube 1 and further light with high brightness is emitted in the anode segments by applying voltage to the segments selectively by a conventional operating method to provide display with high contrast easily. Furthermore, with no need of making the driving circuit of the fluorescent display tube 1 complicated, display is carried out by a conventional operating method.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display device, and more particularly to a fluorescent display device in which a fluorescent display tube is fully lit and a partial highlighting is added.

[0002]

2. Description of the Related Art Conventionally, in a fluorescent display device using a fluorescent display tube, as shown in FIG. 3, a power supply wiring layer 9 made of an Al sputtered film is formed on a glass base plate 8, an insulating layer 10 and through hole dots. The layer 11 and the graphite layer 12 are sequentially formed by coating, and the phosphor layer 1 is formed on the electrode layer of the graphite layer 12.
3 is applied to form an anode substrate 14, and a grid 15 and a filament 1 are formed on the anode substrate 14 as shown in FIG.
6 is provided, and the cover glass 17 is sealed and vacuum-sealed.

As a general operating principle of a fluorescent display tube, thermoelectrons emitted from a filament 16 to which a voltage is applied are accelerated, diffused and controlled by a grid 15 to which a positive voltage is applied, and a positive voltage is applied. The phosphor layer 13 on the graphite layer 12 of the anode segment electrode is stimulated to emit light by excitation.

[0004]

Conventionally, in a fluorescent display device using a fluorescent display tube, a positive voltage is applied to an anode segment to be displayed and no voltage is applied to other anode segments, or a negative voltage is applied. I'm giving. In addition, it is necessary to partially change the voltage condition of the anode segment in order to obtain a display in which all the anode segments are emitted with low brightness and the anode segments are selectively emphasized to obtain high emission. There was a problem that the circuit became complicated.

An object of the present invention is to provide a fluorescent display device capable of obtaining an anode segment of a display which is made to emit light with high brightness in order to selectively emphasize the anode segment without adding a complicated driving circuit. is there.

[0006]

SUMMARY OF THE INVENTION The present invention provides a fluorescent display tube having a filament that emits electrons, a grid that controls the electrons, and an anode segment coated with a phosphor layer that emits light when the electrons are bombarded. In a fluorescent display device including, selective excitation light emission of the anode segment due to the impact of the electrons emitted from the filament, and the entire surface excitation light emission of the anode segment by irradiating ultraviolet rays from the outside of the fluorescent display tube. Display together. As an irradiation source of the ultraviolet rays, an ultraviolet lamp having a wavelength range of 300 to 400 nm is provided, and the ultraviolet rays are blocked by the observation side to prevent the ultraviolet rays irradiated to the fluorescent display tube from leaking to the display observation side. Place a cutoff filter.

[0007]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a sectional view of a main part of an in-vehicle reflective fluorescent display device according to a first embodiment of the present invention. The first embodiment is
As shown in FIG. 1, ultraviolet rays 6 emitted from an ultraviolet lamp 2 arranged in the vicinity of the fluorescent display tube 1 excite the fluorescent layers of all anode segments in the fluorescent display tube 1 to emit light with low luminance. The display light 5 emitted from this phosphor layer passes through the ultraviolet blocking filter 3 and is reflected by the reflecting mirror 4, reaches the observation side, and a low-brightness display of all anode segments is observed. In this state, a voltage is selectively applied by a conventional driving method only to the anode segment of the portion to be emphasized, and high-luminance display is performed. The ultraviolet rays 6 emitted from the ultraviolet lamp 2 are blocked by the ultraviolet blocking filter 3 and do not reach the observation side.

FIG. 2 is a sectional view of a main part of an in-vehicle reflective fluorescent display device according to a second embodiment of the present invention. The second embodiment is
As shown in FIG. 2, the ultraviolet rays 6 emitted from the ultraviolet lamp 2 arranged at a position facing the fluorescent display tube 1 pass through the ultraviolet rays 6 arranged in the middle of the fluorescent display tube 1 and the ultraviolet lamp 2. After passing through the display reflection half mirror 7, the phosphor layers of all the anode segments in the fluorescent display tube 1 are excited to emit light with low luminance. The display light 5 emitted from the phosphor layer passes through the ultraviolet blocking filter 3 and is reflected by the half mirror 7, reaches the observation side, and a low-brightness display of all anode segments is observed. In this state, a voltage is selectively applied by a conventional driving method only to the anode segment of the portion to be emphasized, and high-luminance display is performed. UV lamp 2
The ultraviolet rays 6 radiated further are blocked by the ultraviolet blocking filter 3 and do not reach the observation side.

The ultraviolet wavelength range of the ultraviolet lamp 2 used in the above first and second embodiments is set to the range of 300 to 400 nm which is most effective for the excitation and emission of the phosphor layer in the fluorescent display tube 1. On the other hand, in order to prevent the ultraviolet rays 6 from leaking to the observing side and irradiating the observer with the leakage, the ultraviolet ray blocking filter 3 is arranged.

[0011]

As described above, according to the present invention, by providing an ultraviolet ray irradiation source outside the fluorescent display tube, all the anode segments are caused to emit low-intensity light by ultraviolet rays and the voltage is changed by the conventional driving method. It is possible to easily provide an anode segment for display in which the anode segment is made to emit high brightness by selectively applying high brightness, and further, it is possible to display by a conventional driving method without complicating the driving circuit of the fluorescent display tube. .

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a vehicle-mounted reflective fluorescent display device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of a vehicle-mounted reflective fluorescent display device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of an essential part showing an example of the structure of an anode substrate of a conventional fluorescent display tube.

FIG. 4 is a partially cutaway perspective view showing an example of the structure of a conventional fluorescent display tube.

[Explanation of symbols]

 1 Fluorescent Display Tube 2 Ultraviolet Lamp 3 Ultraviolet Blocking Filter 4 Reflector 5 Display Light 6 Ultraviolet 7 Half Mirror 8 Glass Substrate 9 Power Supply Wiring Layer 10 Insulating Layer 11 Through Hole Dot Layer 12 Graphite Layer 13 Phosphor Layer 14 Anode Substrate 15 Grid 16 Filament 17 Cover Glass 18 Getter 19 F Support 20 Nesa Terminal 21 Seal Glass

Claims (3)

[Claims] 1. A fluorescent display device including a fluorescent display tube having an electron-emitting filament, a grid for controlling the electron, and an anode segment coated with a phosphor layer that emits light by the impact of the electron. It is possible to perform display by using a combination of selective excitation and emission of the anode segment by the impact of the electrons emitted from the filament and total excitation and emission of the anode segment by irradiating ultraviolet rays from the outside of the fluorescent display tube. Characteristic fluorescent display device. 2. The ultraviolet radiation source has a wavelength range of 3
The fluorescent display device according to claim 1, further comprising an ultraviolet lamp having a wavelength of from 0 to 400 nm. 3. A fluorescent display device, wherein an ultraviolet blocking filter for blocking the ultraviolet rays is arranged on the observation side in order to prevent leakage of the ultraviolet rays radiated on the fluorescent display tube to the display observation side.