JPS59111195A - Display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a spray device, particularly one using a discharge tube.

[Technical background of the invention]

Generally, as a light source used in a display device, 'i>
Some proposals have been made to use an FF bulb, a fluorescent lamp, or a cathode ray tube, but a discharge tube is effective because it has a high luminous efficiency relative to the power of the supply box.

[Problems with background technology]

However, the display 4ζ! In the case of 7, since a large number of discharge tubes are arranged close to each other, discharge interference occurs between adjacent radiation eyes L'ρ, and the number of discharge tubes 'l + t!11. The present inventor has discovered that there is a problem in that errors occur and the displayed image is distorted.

This will be explained in detail using Figure 11 of the bottle and Figure 2 of the spear.

(1, L) (1, 3) are discharge tubes as adjacent light sources, for example, fluorescent lamps, and when the dimming switches (2a) and (24') are closed, 3a)
In the case of (34), the light is turned on via the ballast circuit (4a) (Q) consisting of an inductance due to the power supply from the wave power source.

In the state shown in Figure 1, the discharge tube (1a) is lit and the discharge tube (1b) is lit.
When is not lit, b; is shown. Usually each power supply (3,)
There is a stray capacitance (5°) (5°) between the (back) line and the ground.
J) exists and adjacent discharge tubes (1a) (1k)
There is also a stray capacitance (6) between them. For this reason, the power supply (
34), switch (2a), ballast circuit (4a), discharge tube (la), and power supply (3a), as shown in the actual record. At the same time, the discharge tube is lit, and at the same time the electric button (
3,), switch (2cL), ballast turn Ptt (4
a), discharge tube (14), stray capacitance (6), discharge tube (14)
), floating capacitance i(5,)(5,), and power supply (3a), which constitutes a current-carrying path shown by the dots, and this causes the discharge tube (14) to emit light, although it is like a slight F2 discharge. There is.

This phenomenon can be seen in the radiation tube (shown with diagonal lines in Figure 2).
14) This is likely to occur immediately after the lights are turned off and the gas in the pipe is activated. Particularly when the power supplies (3a) (34) are of high frequency, the impedance of the floating answer Q(6) is low, and the above-mentioned interference problem is likely to occur. In particular, when the discharge tube (14) is deeply dimmed, the proportion of the amount of light emitted by interference becomes larger than the amount of light emitted by the original lighting structure, so there is a drawback that it is difficult to obtain a display by deep dimming control.

[Purpose of the invention]

The present invention has been made to address the above-mentioned drawbacks, and provides a display device that can prevent discharge interference between discharge tubes disposed close to each other and can provide a display image without disturbance.

[Outline of the invention]

The display device of the present invention is designed to prevent discharge interference between discharge tubes disposed in close proximity to each other.

A light source picture element is formed by h'n'2, a large number of these light image picture elements are arranged in parallel, a conductor is interposed between the discharge path of each picture element, and this conductor is grounded. With this characteristic configuration, it is possible to prevent problems such as the emission of light from a sight tube that should be turned off, and to ensure that germs are sterilized without disturbing the displayed image.

[Embodiments of the invention].

Next, 11 examples of the present invention will be explained based on Figures 3 to 7.

Figure 3 shows a color display device, and the display surface is a picture consisting of three color light sources: red, blue, and green. 121 are arranged in parallel. These light sources (
6) (B) (G) is a discharge tube (for example, a fluorescent lamp 131) which is bent into a U-shape and coated with a phosphor that emits red, blue, and green colors, as shown in Figures 114 to 116. It is formed in

Each of these discharge tubes (131 is equipped with a socket [19VC] placed at the front end of the cylindrical vessel body f141, and is connected to the vessel through the ballast (161) also located in the vessel body a layer. It is radially connected to a connector (171) fixed to the rear end surface of the body α4).

Reference numeral 08) is a lamp housing, which is made of a conductor and has an inner shape, and its rear end is fixed to the outer peripheral surface of the front fi4 of the vessel body (14) and is grounded.This lamp housing αa is connected to the picture element (171 At least k, except for the part corresponding to the front surface of
The circumference of the discharge path from one filament of the ft tube (131 to the other filament) is warped.

Note that there is no problem in providing the lamp housing (18) with one or two small air circulation holes.

The off-line diagram is an electrical connection diagram of the color display device of the present invention.
) (13, 4) are connected to respective dimming switches (19,) (194) and high frequency power sources (20a) (2oo) lc via connectors 07) shown in Figure 6.

Next, the operation of this embodiment will be explained using off-line diagrams.

As in the conventional case shown in Figure 1, stray capacitance (21, 214) exists between the lines of each high frequency power source (20, E) (20, 6) and the ground. The stray capacitance that existed between the discharge tubes (13a) and (134) is removed by the lamp housing agI (22
a) It exists in a form divided into (224),
Ru.

When the discharge tube (13a) is lit and the discharge tube (134) is not lit, the discharge tube (
13, z) At the same time when 6" is turned on, the interfering energized path connects the high frequency power source (20,), switch (19,), ballast (16a), discharge tube (13a), and stray capacitance as shown by the dotted line. (22,), lamp housing (18), floating g
Since the current flows through the current-carrying path of the high-frequency power source (21a) and the high-frequency power source (20a), the discharge tube (134) is not affected, and the discharge tube (134) emits light and the displayed image is disturbed. It can be prevented.

Note that the air flow hole that can be provided in the lamp housing Oa must be of a size and position that does not cause discharge interference between the discharge tubes (13a) and (134) through the air flow hole.

Further, the same effect can be obtained even when the discharge tube (131) is a cathode ray tube, a neon tube, etc. Furthermore, the power source is not limited to a high frequency, but may be a commercial power source or a DC power source.

In addition, the structure of the lamp housing (18) is No. 1 and 8.
As shown in Fig. 9 and Fig. 9, it may be fixed to a plate 051 formed of a grounded conductor by welding or the like, and it is not provided corresponding to each discharge tube 0.31. Combining conductor plates in a lattice pattern to make Lanzino 1 Uging tt
It is also possible to form a structure in which the discharge tubes (131) are arranged in the meshes of the grid.In addition, a transparent conductive coating may be formed on the body of the discharge tube and this may be grounded.

〔Effect of the invention〕

According to the present invention, since a grounded conductor is interposed between the discharge paths of each picture element, inconveniences such as discharge interference occurring between adjacent discharge tubes and discharge tubes that should be turned off emitting light can be prevented. It is possible to perform deep dimming, and the displayed image can be controlled reliably without disturbance.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the electrical connections of a conventional display device, Figure 2 is an explanatory diagram showing the lighting state of the discharge tube in Figure 1, and Figure 3 is a front view showing an embodiment of the display device of the present invention. Figures 4 and 4 are front views showing the picture elements, Figures 5 and 5 are perspective views of the light source, Figures 6 and 7 are cross-sectional views of the same, Figures 7 and 7 are diagrams showing electrical connections of the display device, and Figures 8 and 8 are sectional views of the same. FIG. 9 is a perspective view of a light source showing another embodiment of the present invention, and FIG. 9 is a sectional view taken along line FF-W in FIG. (12...picture element, 31 (13a) (137), discharge tube, (l-) lamp housing composed of conductor. $4 page

Claims (1)

[Claims] (1) Light source pixels are formed in a discharge tube, a large number of these light source pixels are arranged side by side, a chi body is interposed between the discharge path of each of the pixels, and this conductor is grounded. and display hair styling.