JP2001176654A - El display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an EL display device which prevents a leakage of a dispersion light generated at a peripheral end of a glass substrate to a front side from a peripheral area on a display and raises a display quality. SOLUTION: This EL display device 20 is mainly constructed in such that a shading section 16 is formed at least on a peripheral area 17 of a display 11 on the transparent substrate 4 on which the EL element 8 is laminated, so that a dispersion light 14 which is a light that passes the transparent substrate 4 and is scattered at the end peripheral surface 18 of the transparent substrate 4 among the light which the EL element 8 emitted, leaks and appears from the peripheral area 17 on the display surface 11 of the transparent substrate 4 in a front side may be shaded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EL display device and, more particularly, to light emitted from an EL element, which is guided inside a glass substrate and scattered at an edge of the glass substrate to be visually recognized from a peripheral region on a display surface. The present invention relates to an EL display device that prevents display quality from being lowered by scattered light leaking to a user.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional EL display device 1 has a transparent electrode 5 on a back surface of a glass substrate 4 as an anode layer.
For example, a pattern is formed in accordance with the display content, and a light emitting layer 6 and a back electrode 7 as a cathode layer are sequentially laminated thereon (this lamination is referred to as an EL element 8) to form a main structure.

In such an EL display device 1, both electrodes 5, 7
When a voltage is applied therebetween, only a portion of the light-emitting layer 6 that overlaps the portion where the transparent electrode 5 is patterned emits light, and the emitted light is transmitted from the display surface 11 to the front side (viewer's eye). Side), a display image formed by the transparent electrode 5 is displayed on the display surface 11.

[0004]

However, in such an EL display device 1, the light rays emitted from the EL element 8 are usually radiated radially, so that the glass substrate 4 is included in the emitted light rays. In addition to the direct light 12 that passes through and reaches the viewer directly, the light is repeatedly reflected on the inner surface of the glass substrate 4 to be guided to the glass edge 13, scattered at the edge 13, and from the peripheral area 17 of the display surface 11. There is scattered light 14 that leaks out and reaches the viewer (front side). The scattered light 14 at the glass edge 13 causes the visibility of the display image 11 to be reduced.

An object of the present invention is to provide an EL display device in which the scattered light generated at the edge of the glass substrate is prevented from leaking to the viewer side and the display quality of the displayed image is improved. .

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to a transparent substrate having an EL element laminated on a back surface thereof, and at least a display surface of the transparent substrate. And a light-shielding means arranged in a covering manner in a peripheral region of the light-emitting device.

In this case, it is desirable that the light shielding means is an opaque film attached to the transparent substrate or a paint film printed on the transparent substrate.

Alternatively, the EL display device according to claim 1, wherein the EL display device has a display panel having a display window, a window frame portion of the display window constituting the light shielding means, and the decorative panel. And a printed circuit board disposed at a predetermined position in the interior of the decorative panel, and the light blocking means of the decorative panel may press and fix the peripheral region of the transparent substrate toward the printed circuit board.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of the EL display device according to the first embodiment of the present invention.

The EL display device 20 according to this embodiment is
As shown in FIG. 1, a transparent substrate 4 on which an EL element 8 is laminated
The light rays 1 leaking from the peripheral area 17 of the display surface 11
A light-shielding portion (light-shielding means) 16 for shielding light 4 (scattered light) is provided, and is mainly configured. In FIG. 1, the same or corresponding parts as those of the conventional device 1 (see FIG. 3) are denoted by the same reference numerals.

The EL element 8 is made of indium tin oxide (IT) as an anode layer on the back side of a transparent substrate 4 such as a glass substrate.
O) or the like is formed into a pattern (display pattern) according to display contents, for example, and an organic layer 6 and a back electrode 7 wired with aluminum or the like as a cathode layer are sequentially laminated thereon. Formed. Here, the organic layer 6 includes, for example, a hole transport layer composed of an amine compound, a light emitting layer composed of an aluminum quinol complex, and an electron transport layer composed of a zinc dinuclear complex in that order from the transparent electrode 5 side. It is configured to be laminated. A sealing can 9 is provided on the back surface of the transparent substrate 4 so as to cover the EL element 8.

The light shielding portion 16 covers at least the peripheral area 17 on the display surface 11 of the transparent substrate 4.
(In FIG. 1, as an example, a peripheral region 17 on the display surface 11 of the transparent substrate 4 and an end surface (end portion) of the transparent substrate 4)
18). The light shielding portion 16 guides the inside of the transparent substrate 4 among the light rays emitted by the EL element 8, scatters the light at the end surface 18 of the transparent substrate 4, and surrounds the peripheral region 17 (display surface 11) on the display surface 11 of the transparent substrate 4. The light rays 14 leaking from the front side from the part other than the part 19 overlapping the display pattern are shielded from reaching the viewer, while only the light rays 12 radiated from the part 19 overlapping the display pattern. It reaches the viewer.

The light-shielding portion 16 is formed, for example, by attaching an opaque film to the transparent substrate 4 so as to cover at least the peripheral region 17 on the display surface 11 of the transparent substrate 4, or has a light-shielding property. The paint film is formed by printing on the transparent substrate 4 so as to cover at least the peripheral region 17 on the display surface 11 of the transparent substrate 4.

The EL display device 20 constructed as described above
According to the above, the light shielding portion 16 disposed on the transparent substrate 4
Among the light rays emitted from the EL element 8, scattered light guided inside the transparent substrate 4 and scattered by the end face 18 and leaking from the peripheral area 17 on the display surface 11 of the transparent substrate 4 to the front side (viewer side). Since the light 14 is shielded, display quality can be improved without providing a complicated structure.

Hereinafter, a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a diagram illustrating an E according to a second embodiment of the present invention.
It is sectional drawing of an L display device.

The EL display device 30 according to this embodiment is
As shown in FIG. 2, a printed circuit board 33 is disposed on, for example, the upper surface 32 of the back cover 31, and the EL element 8 is formed by lamination on a support portion 35 disposed on the upper surface 34 of the pudding substrate 33. A transparent substrate 4 on which a sealing can 9 is attached is disposed so as to cover the EL element 8 and the transparent substrate 4 is pressed against the printed circuit board 33 via a support portion 33 to be fixed. 37 is attached to the back cover 31 to form a main configuration.

The printed circuit board 33 has, for example, an EL element 8
A driving circuit for driving the light emission of the light emitting device is mounted. The printed circuit board 33 is wired and connected to the EL element 8 and fixed to the back cover 31 by, for example, a screw (not shown) or by an engaging means such as a locking claw, and is disposed (in FIG. 2). , As an example, when it is directly disposed on the upper surface 32 of the back cover 31).

The transparent substrate 4 has an EL element 8
A sealing can 9 is disposed so as to cover the EL element 8, and the surrounding area 40 of the back surface 39 is supported by the supporting section 35 of the printed circuit board 4.
5. Note that the transparent substrate 4, the EL element 8, and the sealing can 9 are the same as those in the first embodiment, and thus detailed description is omitted.

The decorative panel 37 is formed in a box shape having an upper surface 41 provided with a display window 42 and a lower surface 43 opened. The display window 42 is attached to the lower surface 43 of the decorative panel 37 so that the back cover 31 is fitted thereto, and the lower surface 45 of the window frame portion 44 of the display window 42 is attached to the periphery of the display surface 11 of the transparent substrate 4. A peripheral wall portion 46 is integrally formed so as to cover the region 17 and to surround the end surface 18 of the transparent substrate 4 on the lower surface 45 thereof.

The lower surface 45 of the window frame portion 44 and the peripheral wall portion 4
A light shielding means is formed by the light shielding means 6, and among the light rays emitted by the EL element 8, the light is guided inside the transparent substrate 4 and scattered at the end face 18 of the transparent substrate 4, and the light is emitted from the display surface of the transparent substrate 4. The light rays 14 leaking from the peripheral area 17 on the front side to the front side are blocked from reaching the viewer, and only the light rays 12 emitted from the area 19 overlapping the display pattern reach the viewer. ing.

Further, the transparent substrate 4 is positioned at a predetermined position by the peripheral wall portion 46, and the display surface 11 of the transparent substrate 4 is appropriately positioned.
The upper peripheral region 17 is covered and hidden by the lower surface 45 of the window frame portion 44.

Although not shown, the decorative panel 37 is fixed to the back cover 31 by fixing means such as screws or engaging means such as locking pawls.

When the decorative panel 37 is attached to the back cover 31, the transparent substrate 4 is disposed at an appropriate position on the support 35 by the peripheral wall 46 formed on the back 45 of the window frame 44. Peripheral area 1 of transparent substrate 4
7 is a supporting portion 3 of the printed circuit board 33 by the window frame portion 44.
Pressed to the 5th side. Thus, the transparent substrate 4 is sandwiched and fixed between the decorative panel 37 and the printed circuit board 33 via the support portion 35. That is, the peripheral area 17 of the transparent substrate 4 is changed to the printed circuit board 33 by the light shielding means of the decorative panel 37.
Pressed and fixed to the side. In this state, the peripheral area 17 of the display surface 11 of the transparent substrate 4 is
And the surrounding wall portion 46, thereby providing an EL
Of the light rays emitted by the element 8, the light is guided inside the transparent substrate 4 and scattered by the end face 18 of the transparent substrate 4, and the display surface 1 of the transparent substrate 4 is
The light rays 14 leaking from the peripheral area 17 on the front side to the front side are shielded from reaching the viewer.

The EL display device 30 configured as described above
According to the present embodiment, in addition to having the same effect as the first embodiment, the decorative panel 37 also has a function of a light shielding unit and the decorative panel 37 also has a function of pressing and fixing the transparent substrate 4 to the printed circuit board 33 side. Therefore, the number of parts can be reduced, and the cost can be reduced.

In this embodiment, the printed circuit board 3
Although the case where 3 is fixed to the back cover 31 has been described, the present invention is not limited to this. For example, the printed circuit board 33 may be fixed to the decorative panel 37 side. Even in such a case, the transparent substrate 4 is pressed and fixed to the printed circuit board 33 side by the decorative panel 37 in a state where the printed circuit board 33 is disposed on the decorative panel 37.

[0026]

According to the first aspect of the present invention, of the light emitted from the EL element by the light-shielding means, the light is guided inside the transparent substrate and scattered at the edge of the transparent substrate to be scattered on the display surface. Because scattered light leaking from the area to the front side is blocked,
The visibility and the display quality of the displayed image can be improved.

According to the second aspect of the present invention, since the light shielding means is an opaque film adhered to a transparent substrate or a paint printed on the transparent substrate, the light shielding means can be provided on the display surface without providing a complicated structure. Scattered light leaking from the peripheral region to the front side can be shielded.

According to the third aspect of the present invention, since the decorative panel also has a function of a light blocking means and also has a function of pressing and fixing the transparent substrate to the printed circuit board side, the visibility of the displayed image and the The display quality can be improved and the number of parts can be reduced, so that the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view of an EL display device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an EL display device according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional EL display device.

[Explanation of symbols]

 Reference Signs List 4 transparent substrate (glass substrate) 11 display surface 14 scattered light 16 light shielding portion 17 peripheral region 18 end surface 20, 30 EL display device 33 printed substrate 37 decorative panel

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takanori Ito 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi F-term in Harness Research Institute, Ltd. (Reference) 3K007 AB17 AB18 CA01 CB01 DA00 DB03 EB00 FA01

Claims (3)

[Claims] 1. An EL display device comprising: a transparent substrate having EL elements laminated on a back surface side thereof; and a light-shielding means disposed so as to cover at least a peripheral area on a display surface of the transparent substrate. 2. The EL display device according to claim 1, wherein said light-shielding means is an opaque film attached to said transparent substrate or a paint film printed on said transparent substrate. EL display device. 3. The EL display device according to claim 1, wherein the EL display device includes a decorative panel having a display window, and a window frame portion of the display window constituting the light shielding unit. And a printed circuit board disposed at a predetermined position in the interior of the panel, wherein the light blocking means of the decorative panel presses and fixes the peripheral region of the transparent substrate toward the printed circuit board. Display device.