JPH03283385A - Thin film electroluminescence display device - Google Patents

Abstract

PURPOSE:To obtain a thin film electroluminescence display device with an excellent visibility by setting the curvature of at least part of a transparent substrate to a value other than zero. CONSTITUTION:A curvature is applied to a transparent substrate 1. The semi-circular glass substrate 1 is used, and tin-added indium oxide 2 as an transparent electrode, tantalum pentaoxide 3 (Ta2O3) as the first insulating layer, manganese- added zinc sulfide 4 as a light emitting layer, Ta2O5 5 as the second insulating layer, and aluminum 6 as a back electrode are stacked in sequence on the glass substrate 1. When the glass substrate 1 has a curvature, vertical seams between panels can be eliminated, thus the fast reading property is improved. The visibility can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thin film electroluminescent display device (hereinafter referred to as a thin film EL display device).

(Conventional technology) The basic structure of a thin film EL display device is shown in FIG.

To specifically explain the structure of a thin film EL display device with reference to FIG. 5, transparent electrodes 2 arranged in a grid pattern on a transparent substrate l such as a glass substrate, a dielectric material 3 made of Y, O, etc. made by sputtering method, ZnS doped with Mn etc. made by vapor deposition method
A light emitting layer 4 such as, a dielectric 5 similar to the dielectric 3, a transparent electrode 2
The back electrode 6 is made of AI or the like and is arranged perpendicular to the rear electrode 6. When an alternating current voltage is applied to the transparent electrode 2 and the back electrode 6, the portion where the electrodes intersect emits light. In addition, the dielectric material is 3゜5
One of them can be omitted.

(Problems to be Solved by the Invention) Conventionally, a flat glass plate has been used as a transparent substrate of a thin film EL display device. However, depending on the device to which the display device is attached, such as a helmet windshield or a bulletin board, there is a need to further improve visibility.

In order to improve visibility, conventionally, small panels were arranged at an angle, as shown in Figure 3. This poses a problem in that the vertical grain between each panel is not displayed, and the display between the panels cannot be read quickly, resulting in poor visibility.

The present invention provides a thin film EL display device with excellent visibility.

As shown in FIGS. 2 and 4, the transparent substrate is characterized by having a curvature. The curved portion may be part of the transparent substrate. By providing curvature, it is possible to eliminate vertical grain between panels, thereby improving speed reading and visibility.

Hereinafter, an explanation will be given with reference to FIG. 4, taking a bulletin board as an example. A semicircular glass substrate l as shown in FIG. 4 was used. On top of that, tin-doped indium oxide 2 (
ITO) was produced by a sputtering method, and a predetermined pattern was formed by photolithography. On top of that,
Tantalum pentoxide 3 (Ta, O,) was deposited as the first insulating layer by sputtering, then manganese-doped zinc sulfide 4 (ZnS:Mn) was deposited as the light emitting layer by electron beam evaporation, and then Ta was deposited as the second insulating layer. , 0.5 by sputtering, and finally aluminum 6 (AI) as a back electrode by sputtering. Next, the AI is formed into a predetermined pattern by photolithography, and finally moisture-proof sealing is performed. By connecting this substrate covered with a sealing glass cap to a drive circuit, a bulletin board with a thin film EL display device is completed as shown in FIG.

Another example is the helmet windshield shown in FIG. FIGS. 1(a), (b), and (c) are a perspective view, a front view, and a top view, respectively. The manufacturing method is the same except that the shape of the glass substrate 1 is different from that shown in FIG. 4.

For example, a thin film EL display device for displaying speed is attached to a part of the windshield.

(Effects of the Invention) The thin film EL display device has no vertical lines in the display and has excellent visibility.

[Brief explanation of the drawing]

FIG. 1 shows a helmet showing one embodiment of the present invention, and (a), (b), and (c) are a perspective view, a front view, and a front view, respectively.
A top view, FIG. 2 is a perspective view of a bulletin board showing another embodiment of the present invention, FIG. 3 is a perspective view showing a conventional bulletin board, and FIG. 4 is a sectional view for explaining the present invention in detail. FIG. 5 is a cross-sectional view for explaining the conventional manufacturing method. Description of symbols 1, transparent substrate 3, first insulating layer 5, second insulating layer 7, sealing glass cap 9, windshield transparent electrode light emitting layer back electrode Herut bulletin board

Claims (1)

[Claims] 1. In a thin film electroluminescent display device comprising a transparent substrate, a transparent electrode, a light-emitting layer, a back electrode, and a dielectric formed on at least one side of the light-emitting layer, the curvature of at least a portion of the transparent substrate is non-zero. Characteristic thin film electroluminescent display device.