JP2000075806A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which is short in front and rear lengths. SOLUTION: This display device has an org. electroluminescence element 12 and a light emission type display 13 for projecting display light L to the org. electroluminescence element 12. The org. electroluminescence element 12 is formed by successively laminating a transparent electrode, org. layer and rear surface electrode on a translucent substrate. The rear surface electrode consists of a metallic layer of aluminum, etc. The display light L of the light emission type display 13 is reflected to an observer 28 side by the rear surface electrode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly, to a display device having an electroluminescent display element called electroluminescence (EL).

[0002]

2. Description of the Related Art Conventionally, there is a vehicle display device 1 as shown in FIG. In such a vehicle display device 1, a pointer-type instrument 3 is provided behind a half mirror 2 arranged diagonally, and a fluorescent display tube 4 is provided above the half mirror 2. The display light L of the fluorescent display tube 4 is projected on the half mirror 2 and reflected toward the observer 5. The pointer-type instrument 3 has a dial 6 and a pointer 7 indicating the dial 6, and a lighting bulb 8 is disposed behind the dial 6. In addition, a light source is buried in the base of the pointer 7, and the indicator shines. The observer can visually recognize the virtual image 9 of the display light L and the pointer-type instrument 3 so as to overlap each other.

[0003]

However, the reflectance of the half mirror 2 is about 50%, and the remaining about 50% is transmitted through the half mirror 2, so that there is a problem that the virtual image 9 is dark. Was. As a solution to this problem, it is conceivable to use a half mirror 2 having a high reflectance. However, since the half mirror 2 having a high reflectance has a low transmittance, a new problem that the pointer-type instrument 3 becomes dark may occur. In addition, since the pointer-type instrument 3 is provided behind the half mirror 2, the length A before and after the display device 1 is set.
Had a problem that it became longer.

[0004]

According to the present invention, there is provided a display device comprising: an electroluminescent display device having a display portion; and a light emitting display device for projecting display light onto the electroluminescent display. Wherein the electroluminescent display element has a reflective layer for reflecting the display light.

Further, according to the present invention, in the electroluminescent device, the reflection layer is a back electrode.

According to the present invention, the luminous display is a pointer-type instrument having a display panel, a pointer for indicating the display panel, and a light source for illuminating the display panel.

Further, the present invention projects the display light on an area of the electroluminescent display element which does not overlap with the display section.

Further, the present invention has a dark color cover disposed in front of the electroluminescent display element.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device 10 has an organic electroluminescent element 12 and a light emitting display 13 for projecting display light L onto the organic electroluminescent display 12. Organic electroluminescent device 12
Is formed by sequentially laminating a transparent electrode 24, an organic layer 25, and a back electrode 26 on a translucent substrate 23. Back electrode 26
Is made of a metal layer such as aluminum, and the display light L of the light emitting display 13 is
Reflect to the side.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a vehicle display device will be described below with reference to the accompanying drawings.

Reference numeral 10 denotes a vehicle display device, which is attached to an instrument panel 11 of the vehicle. The vehicle display device 10 includes an organic electroluminescent display element 12 (hereinafter, referred to as an organic EL) disposed obliquely to an observer and a pointer-type instrument 13 provided above the organic EL 12. . A circuit board 14 is connected to the organic EL 12. As shown in FIG. 2, the organic EL 12 has a bar graph display section 15 (display section). Things. Organic EL12
Displays the number of revolutions by emitting the number of segments 16 corresponding to the number of revolutions of the engine.

The pointer-type instrument 13 includes a dial 18 (display panel),
It has a pointer 19, a light bulb 20 (light source), a pointer driving means 21 such as a stepping motor, and displays the speed of the vehicle. The pointer 19 has a light source such as a light emitting diode buried in the base, and the indicator shines. Reference numeral 22 denotes a dark color cover for embossing a light-emitting display on a dark background. The dark color cover 22 is provided in front of the organic EL 12.

FIG. 3 is a sectional view of the organic EL 12. The organic EL 12 has a transparent electrode 24 on a light-transmitting substrate 23 such as glass.
An organic layer 25 and a back electrode 26 (reflection layer) are formed. The organic layer 25 is formed by sequentially stacking a hole injection layer, a hole transport layer, a light emitting layer, and an electron transport layer. Transparent electrode 24
Is made of ITO (indium tin oxide), and the back electrode 26 is made of a metal layer such as aluminum. A sealing plate 27 is provided on the rear surface of the back electrode 26.

The display light L of the pointer type instrument 13 is an organic EL 12
Is reflected in the direction of the observer 28 by the back electrode 26.
As shown in FIG. 4, the observer 28 can visually recognize the bar graph display section 15 of the organic EL 12 and the virtual image 29 of the display light L in a superimposed manner. As this superimposed form, an organic EL
In a region not overlapping with the display unit 15 of the pointer 12, the pointer-type instrument 13
May be displayed in a reflective manner, or may be partially displayed.

According to the embodiment described above, since the display light L does not pass through the organic EL 12 and has a high reflectance, the virtual image 29 becomes bright. In addition, since no display is provided behind the organic EL 12, the length B before and after the vehicle display device 10 can be reduced. Although the light-emitting display device of this embodiment is the pointer-type instrument 13, it may be, for example, a liquid crystal display device or a fluorescent display tube having a backlight. Although the reflective layer of the present embodiment is the back electrode 26, a reflective layer may be formed on the front surface of the translucent substrate 23, for example. Further, the electroluminescent display element of the present example was the organic EL 12,
For example, a thin film type inorganic EL may be used. Although the display unit of the present embodiment is the bar graph display unit 15, for example, it may be a number display unit in which segments are arranged in a Japanese character shape.

[0016]

According to the present invention, there is provided a display device comprising: an electroluminescent display device having a display portion; and a light emitting display device for projecting display light onto the electroluminescent display. It has a reflective layer that reflects display light, can make a virtual image of display light bright, and can shorten the length before and after the display device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a vehicle display device showing an embodiment of the present invention.

FIG. 2 is a front view of the organic EL showing the embodiment.

FIG. 3 is an enlarged sectional view of the organic EL showing the embodiment.

FIG. 4 is a display explanatory diagram showing the embodiment.

FIG. 5 is a cross-sectional view of a display device showing a conventional example.

[Explanation of symbols]

 Reference Signs List 10 Vehicle display device (display device) 12 Organic EL (electroluminescent display element) 13 Pointer-type instrument (light-emitting display device) 15 Bar graph display unit (display unit) 18 Dial plate (display plate) 19 Pointer 20 Lighting bulb ( Light source) 26 Back electrode (reflective layer)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5C096 AA01 BA04 BA06 BC11 BC19 CA06 CB01 CC06 CC07 CE02 CE12 FA11 FA17 5G435 AA03 BB04 BB05 CC05 CC13 DD03 FF03 LL17

Claims (5)

[Claims] 1. A display device comprising: an electroluminescent display element having a display portion; and a light emitting display for projecting display light onto the electroluminescent display element, wherein the electroluminescent display element emits the display light. A display device comprising a reflection layer for reflecting light. 2. The display device according to claim 1, wherein the reflection layer is a back electrode. 3. The display device according to claim 1, wherein the luminous display is a pointer-type instrument having a display panel, a pointer for indicating the display panel, and a light source for illuminating the display panel. A display device, comprising: 4. The display device according to claim 1, wherein the display light is projected onto an area of the electroluminescent display element that does not overlap with the display section. Display device. 5. The display device according to claim 1, further comprising a dark cover provided in front of said electroluminescent display element.