JPH05347186A - Electroluminescence display - Google Patents

Abstract

PURPOSE:To provide an electroluminescence display which is transparent and has a display function. CONSTITUTION:An EL element is composed of a glass substrate 1, a transparent conductive membrane 2 formed on the substrate 1, the first insulating membrane 3 formed on the membrane surface, a fluorescent membrane 4 formed on the membrane surface, the second insulating membrane 5 formed on the membrane surface, and the upper side transparent conductive membrane 6 formed on the membrane surface. The back plate of the EL element is opaque since it is formed of an Al metal or the like, but it is transparent in the above constitution because two electrodes are formed of a transparent electrode membrane, and a EL element having a display function is formed. As a result, when it is used as a front side setting type display element for a car driver, it is transparent when no voltage is applied, and the visual field of the driver is never interrupted. And even when it is in the display condition, the non-luminous part is transparent, and the driver can recognizes the front condition while watching the display.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electroluminescence display, and more particularly to improvement of an electroluminescence display suitable for mounting on a vehicle.

[0002]

2. Description of the Related Art It is widely recognized that in today's highly information-oriented society, a display device, which is a terminal for information, occupies an important position of an interface connecting humans and machines.

Usually, a CRT, that is, a conventional cathode ray tube is used as a display device, especially for a personal computer which has become popular recently. On the other hand,
As seen in the popularization of laptop type personal computers, the demand for portable terminal devices has increased in recent years.

For the above purpose, a conventional CRT having a large weight and a large space is not suitable, and a flat type display capable of displaying a large capacity has been attracting attention as a substitute for the CRT. Also, not only for portable computers, but also for home use and in-vehicle use,
There is a great need for weight reduction.

There are many types of flat displays such as plasma displays (PDPs), liquid crystals (LCDs), fluorescent display tubes (VFDs) and electroluminescence (ELs), and they are used in various places according to their characteristics. Has been converted. In particular, a liquid crystal has been widely used as a terminal of a recent portable computer, and has been put into practical use as a small TV device. However, the liquid crystal has many drawbacks such as a passive display device, viewing angle dependency, poor visibility and low display quality. Not only liquid crystal but also other flat type displays have advantages and disadvantages, and the reality is that they do not have performance comparable to that of today's CRT.

Of these, electroluminescence (EL) is the closest to the CRT in terms of visibility. There are two types of EL, a dispersed type formed of powder and a thin film type using a thin film. The dispersed type has a long history of practical use, and has recently attracted attention as a pack light for liquid crystals. On the other hand, the thin film type has a short history of research, but the year 1974
Year after year, high brightness and long life AC type EL with double insulation structure
Has been in the spotlight since its inception. This thin film type enables dot matrix display by cutting the electrode pattern, and has been put to practical use as a graphic display. In the following description, the EL device is limited to the thin film type. The features of the EL device are as follows.

(A) It is an all-solid-state device and is robust. (B) Excellent visibility. (C) It is thin and lightweight. (D) There is no viewing angle dependency.

On the other hand, the demand for in-vehicle displays has been increasing in recent years. This is because, with the introduction of navigation systems and the like, computers were installed as standard equipment, and matrix displays were needed instead of the conventional segmental displays. Current,
A liquid crystal display device is mainly used.

[0009]

The conventional on-vehicle display is installed on the console of the vehicle, but the driver needs to divert his / her view from the front in order to see a large amount of data. It will be a very dangerous situation until humans recognize the data of.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points.
An object of the present invention is to provide an EL display in which a large amount of information can be understood by using an element without changing the driver's visual field.

[0011]

The EL display of the present invention comprises a glass substrate, a transparent conductive film formed on the glass substrate, a first insulating film formed on the transparent conductive film, and a first insulating film formed on the transparent conductive film. The gist of the invention is that it comprises a fluorescent film formed on one insulating film, a second insulating film formed on the fluorescent film, and an upper transparent conductive film formed on the second insulating film.

[0012]

Since the EL display having the above-mentioned structure uses the transparent conductive film for the back electrode, it is transparent and has a display function.

[0013]

1 shows an EL display (E) according to an embodiment of the present invention. In the figure, 1 is a glass substrate,
Reference numeral 2 is a transparent conductive film such as ITO or ZnO formed on the upper surface thereof, and the first insulating film 3 is formed on the upper surface thereof.
Further, a fluorescent film 4 is formed on the upper surface thereof, a second insulating film 5 is formed on the fluorescent film, and an upper transparent film 6 such as ITO or ZnO is formed on the second insulating film.

Normally, the back electrode of an EL element is opaque because it uses a metal electrode such as Al, but as described above, it is possible to use a transparent conductive film such as ITO or ZnO for the back electrode. For example, a transparent element having a display function is formed. Materials such as the fluorescent film and the insulating film are not limited.

FIG. 2 shows a state in which the EL display (A) having the above structure is installed in a vehicle. In the figure, 7 is a console panel, 8 is a windshield, 9 is a driver, and the EL display (A) is installed in front of the driver.

The EL display (A) is transparent in the state where no voltage is applied, and does not hinder the driver's view. Also in the display state, the non-light-emitting part is transparent, and the driver's front situation can be recognized at the same time when the display is seen. In addition, if the material and structure of the fluorescent film is devised, not only monochromatic light emission but also multi-color,
Full-color display is also possible.

[0017]

As described above, according to the present invention,
Since the two electrodes of the EL element are formed of a transparent conductive film, the EL element is suitable as a front-mounted display element for a vehicle driver.
You can get a display.

[Brief description of drawings]

FIG. 1 is a side view of an EL display showing an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a state in which the EL display is used for a vehicle-mounted front-mounted display element.

[Explanation of symbols]

 A EL display 1 glass substrate 2 transparent conductive film 3 first insulating film 4 fluorescent film 5 second insulating film 6 upper transparent conductive film 7 console panel 8 windshield 9 driver

Claims (1)

[Claims] 1. A glass substrate, a transparent conductive film formed on the glass substrate, a first insulating film formed on the transparent conductive film, and a fluorescent film formed on the first insulating film. ,
An electroluminescent display comprising a second insulating film formed on the fluorescent film and an upper transparent conductive film formed on the second insulating film.