JP3803571B2 - Flat display device and electroluminescence display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flat display device and an electroluminescence display device in which a light emitting portion provided on a translucent substrate emits light.
[0002]
[Prior art]
Conventionally, this type of electroluminescent display device includes a glass substrate which is a light-transmitting substrate. The glass substrate is provided with an electroluminescence element to form an electroluminescence portion as a light emitting portion, that is, an EL portion. Further, the EL portion is protected by a metal cap as a cap body formed of a conductive metal. The metal cap is installed on the glass substrate.
[0003]
In addition, a drive circuit board for controlling the light emission of the EL portion is disposed separately from the metal cap and the glass substrate, and the drive circuit board is connected to the glass substrate.
[0004]
[Problems to be solved by the invention]
However, in the above-described electroluminescence device, since the drive circuit board is disposed apart from the metal cap, the drive circuit board may be in mechanical contact with the metal cap. Further, since the drive circuit board is not grounded, there is a possibility that radiation noise may be generated from the drive circuit board, and thus there is a problem that downsizing is not easy.
[0005]
The present invention has been made in view of these points, and an object of the present invention is to provide a flat display device and an electroluminescence display device that can be further downsized and have excellent radiation noise characteristics.
[0006]
[Means for Solving the Problems]
The present invention relates to a translucent substrate, a light emitting portion provided on the translucent substrate, a conductive cap body covering the light emitting portion and disposed on the translucent substrate, and the cap body And a circuit board that is connected to the tape body and controls the light emission of the light-emitting portion.
[0007]
And in this structure, the cap body which has electroconductivity covers the light emission part provided in the translucent board | substrate, and this cap body is arrange | positioned in a translucent board | substrate. Further, a conductive tape body is connected to the cap body, and the tape body is connected to a circuit board that controls light emission of the light emitting section. As a result, since the circuit board is connected to the cap body that covers the light emitting portion via the tape body, mechanical contact between the circuit board and the cap body is further prevented, and thus further miniaturization is possible. Further, since the tape body in which the circuit board and the cap body are connected has conductivity, the cap body is grounded, so that generation of radiation noise from the circuit board is suppressed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the configuration of the first embodiment of the electroluminescence display device of the present invention will be described with reference to FIG.
[0009]
In FIG. 1, reference numeral 1 denotes an electroluminescence module, that is, an EL (ElectroLuminescence) module. The EL module 1 is a flat display device, and is formed in a rectangular flat plate shape using transparent glass having translucency. A glass substrate 2 which is a translucent substrate is provided.
[0010]
Then, an electroluminescence material is deposited or dropped at a predetermined position on the back surface side, which is one main surface of the glass substrate 2, so that an electroluminescence element as a light emitting section, that is, an EL section 3 which is an EL element. It is arranged. Further, a circularly polarizing plate 4 is disposed on the surface side of the other main surface of the glass substrate 2 facing the EL portion 3 in order to prevent a display contrast from being lowered due to reflection of external light.
[0011]
Furthermore, a conductive ground electrode 5 is disposed on the side of the EL portion 3 that is the back side of the glass substrate 2, that is, on the outer peripheral area. On the back side of the EL portion 3, a metal cap 6 as a cap body having conductivity is disposed with a gap. The outer peripheral area of the metal cap 6 is electrically connected to the ground electrode 5. As a result, the metal cap 6 covers the entire area of the EL portion 3 from the back surface side through a gap, that is, in a state where the EL portion 3 is sealed.
[0012]
Here, the central region of the metal cap 6 bulges toward the back surface side of the glass substrate 2 and is provided with a bulging portion 7. The outer peripheral area of the bulging portion 7 is formed flat and is provided with a flat portion 8. In addition, an outer peripheral area of the flat portion 8 is inclined outward on the surface side toward the ground electrode 5, and an inclined portion 9 is provided.
[0013]
In addition, a sheet-like insulating sheet 11 having insulating properties is disposed on the back side of the bulging portion 7 and the flat portion 8 of the metal cap 6. The insulating sheet 11 insulates the metal cap 6 and the drive circuit board 12 from each other. Further, an unillustrated exposure hole for exposing a part of the bulging portion 7 of the metal cap 6 is provided in the central region of the insulating sheet 11 located on the back side of the bulging portion 7 of the metal cap 6.
[0014]
On the back side of the insulating sheet 11, a drive circuit board 12 for controlling the light emission of the EL section 3 is arranged in parallel with the glass substrate 2 through a gap, that is, a gap. On the back side of the drive circuit board 12, drive parts 13 such as through holes, electrode pads, and circuit parts are installed.
[0015]
Further, a conductive tape 14 that is a tape-like tape body having conductivity is provided between the front surface side of the drive circuit board 12 and the insulating sheet 11 disposed on the rear surface side of the bulging portion 7 of the metal cap 6. Is arranged. The conductive tape 14 electrically connects the drive circuit board 12 and the metal cap 6 through the exposed hole of the insulating sheet 11 and electrically grounds the metal cap 6.
[0016]
On the other hand, an ACF (Anisotropy Conductive Film) 15 that is an anisotropic conductive film is formed on the other back side in the plane direction of the drive circuit board 12. One end surface side of an FPC (Flexible Print Circuit) 16 which is a flexible wiring board is electrically connected to the back surface side of the ACF 15.
[0017]
Furthermore, a conductive ground electrode 17 is disposed on the back side of the glass substrate 2 that is the side of the ground electrode 5 facing the side where the conductive tape 14 is attached. An ACF 18 that is an anisotropic conductive film is formed on the back side of the ground electrode 17. The back surface side of the ACF 18 is electrically connected to the front surface side of the other end of the FPC 16.
[0018]
Next, the operation of the first embodiment will be described.
[0019]
First, a signal input to a connector (not shown) installed on the drive circuit board 12 is subjected to processing such as D / A conversion in the drive circuit board 12, and the corresponding signal is output to the glass substrate 2 via the FPC 16. Is done.
[0020]
Light emitted from the EL unit 3 based on this signal is transmitted through the glass substrate 2 and then emitted to the outside through the polarizing plate 4 to display an image.
[0021]
In this signal processing, radiation noise is generated from the drive circuit board 12.
[0022]
Therefore, the ground potential of the drive circuit board 12 and the metal cap 6 are electrically connected by the conductive tape 14. Then, since the metal cap 6 is electrically grounded, the glass substrate 2 side is thereby electrically shielded, and the influence of radiation noise generated from the drive circuit substrate 12 is suppressed.
[0023]
Further, by disposing the insulating sheet 11 between the drive circuit board 12 and the metal cap 6, undesired electrical contact between the drive circuit board 12 and the metal cap 6 is prevented.
[0024]
As described above, according to the first embodiment, between the metal cap 6 that covers the EL portion 3 formed on the back surface side of the glass substrate 2 and the drive circuit substrate 12 that drives the EL portion 3. Since the insulating sheet 11 is provided, electrical contact of the drive circuit board 12 to the metal cap 6 is reliably prevented.
[0025]
Therefore, since the drive circuit board 12 and the metal cap 6 can be disposed closer to each other, the EL module 1 can be made thinner, so that the EL module 1 can be further downsized.
[0026]
Further, the metal cap 6 is electrically grounded to the drive circuit board 12 by electrically connecting the front side of the drive circuit board 12 and the back side of the metal cap 6 with the conductive tape 14 having conductivity. The Therefore, the influence of the radiation noise from the drive circuit board 12 can be further suppressed, and the radiation noise characteristic of the drive circuit board 12 can be further improved.
[0027]
Thereby, the radiation noise of the drive circuit board | substrate 12 can affect the display by the EL part 3, or the influence to the exterior through the glass substrate 2 can be prevented.
[0028]
In the first embodiment, the metal cap 6 is grounded through the exposed hole of the insulating sheet 11 on the back surface side of the metal cap 6 and the front surface side of the drive circuit board 12 as shown in FIG. As described above, one surface side of the conductive tape 14 is electrically connected to the back surface side of the inclined portion 9 of the metal cap 6, and the other surface side of the conductive tape 14 is connected in the plane direction of the drive circuit board 12. If it is electrically connected to the side rear side, the same effects as those of the first embodiment can be obtained. Further, the drive circuit board 12 is fixed to the glass substrate 2 by electrically connecting the back side of the inclined portion 9 of the metal cap 6 and the back side of the drive circuit board 12 with the conductive tape 14. Therefore, since it is not necessary to firmly fix the drive circuit board 12 to the glass substrate 2 with other members or the like, the design freedom of the EL module 1 is improved.
[0029]
Further, as shown in FIG. 3, the first embodiment described above can be achieved by electrically connecting the outer peripheral surface of the metal cap 6 to the rear surface of the ground electrode 5 with the conductive paste 19 having conductivity. The same effect as the form can be achieved. Here, the amount of the conductive paste 19 is controlled so as not to rise above the height of the metal cap 6. Moreover, when this electrically conductive paste 19 has thermosetting property, what hardens | cures at 60 degrees C or less, for example so that the EL part 3 may not be damaged is desirable.
[0030]
Next, the configuration of the second exemplary embodiment of the present invention will be described with reference to FIG.
[0031]
The electroluminescent display device shown in FIG. 4 is basically the same as the electroluminescent display device shown in FIG. 1, except that the front side of the intermediate region of the FPC 16 is connected to the back side of the ACF 18 and the other side of the FPC 16 is the side. It is stretched in the direction.
[0032]
One surface side of the FPC 16 is connected to the back surface side of the ACF 15 disposed on the other back surface side of the drive circuit board 12. Further, the other back side of the FPC 16 is connected to one side surface of a PCB (Print Circuit Board) 21.
[0033]
A connector 22 for connecting the PCB 21 to the outside is provided on the back side of the other side of the PCB 21. The connector 22 is supplied with power to the EL unit 3, a control signal for turning on / off the power to the EL unit 3 as necessary, a signal for adjusting the luminance of the EL unit 3, and the like.
[0034]
As a result, since the signal input to the connector 22 installed on the PCB 21 is sent to the drive circuit board 12 via the FPC 16, the same operational effects as those of the electroluminescence display device shown in FIG. 1 can be obtained.
[0035]
In the second embodiment, as in the first embodiment, the back surface side of the metal cap 6 and the front surface side of the drive circuit board 12 are grounded through the exposed hole of the insulating sheet 11. 5, one surface side of the conductive tape 14 is electrically connected to the back surface side of the inclined portion 9 of the metal cap 6, and the other surface side of the conductive tape 14 is connected to the driving circuit board 12. If it is electrically connected to the back side of the one side, the same effect as the second embodiment can be obtained.
[0036]
Furthermore, as shown in FIG. 6, even if the surface side of the outer peripheral area of the metal cap 6 is electrically connected to the back side of the ground electrode 5 with the conductive paste 19, the same effect as that of the second embodiment is obtained. Can play.
[0037]
Next, the structure of the 3rd Embodiment of this invention is demonstrated with reference to FIG.
[0038]
The electroluminescence display device shown in FIG. 7 is basically the same as the electroluminescence display device shown in FIG. 1, but the other surface side in the surface direction of the FPC 16 is folded back to the back surface side of the glass substrate 2. And connected to the back side of the ACF.
[0039]
As a result, since the signal input to the FPC 16 is sent to the drive circuit board 12, the same operation and effect as the electroluminescence display device shown in FIG. 1 can be obtained.
[0040]
In the third embodiment, as in the first embodiment, the back surface side of the metal cap 6 and the front surface side of the drive circuit board 12 are grounded through the exposed hole of the insulating sheet 11. 8, one surface side of the conductive tape 14 is electrically connected to the back side of the inclined portion 9 of the metal cap 6, and the other surface side of the conductive tape 14 is connected to the drive circuit board 12. If it is electrically connected to the back side of the one side, the same effect as the third embodiment can be obtained.
[0041]
Furthermore, as shown in FIG. 9, even if the conductive paste 19 is used to electrically connect the front surface side of the outer periphery of the metal cap 6 to the back surface side of the ground electrode 5, the same effects as those of the third embodiment are obtained. Can play.
[0042]
In each of the above embodiments, as shown in FIG. 10, a power supply 31 for supplying power to the drive circuit board 12 and a gate array as a controller for sending a timing signal to the EL unit 3, that is, G / A A digital analog converter for converting a digital signal supplied to the EL unit 3 into an analog signal, that is, a DAC (Digital Analog Converter) unit 33 and the like is mounted on the surface side of the drive circuit board 12, and is shown in FIG. As described above, the FPC 16 whose back side is connected to the front side of the drive circuit board 12 is bent so that the FPC 16 can be applied even to the 4 type EL module 1 whose back side is connected to the back side of the glass substrate 2. Can do.
[0043]
Also, as shown in FIG. 12, the G / A section 32, the DAC section 33, etc. are mounted on the back side of the drive circuit board 12, and the front side is connected to the back side of the drive circuit board 12 as shown in FIG. Even the two-type EL module 1 in which the front surface side of the FPC 16 is connected to the back surface side of the glass substrate 2 can be applied.
[0044]
Furthermore, as shown in FIG. 14, G / A section 32, DAC section 33, etc. are mounted on the back side of drive circuit board 12, and the back side is connected to the front side of drive circuit board 12, as shown in FIG. The FPC 16 is bent, the FPC 16 and the glass substrate 2 sandwich the backlight 34 disposed on the back side of the glass substrate 2, and the back side of the FPC 16 is connected to the back side of the glass substrate 2. Even the EL module 1 can be applied.
[0045]
Furthermore, as shown in FIG. 16, an electroluminescence power supply unit that supplies power to the EL unit 3, that is, an EL power supply unit 35, a power supply unit 31, a G / A unit 32, a DAC unit 33, etc. As shown in FIG. 17, the FPC 16 mounted on the front surface side and bent on the front surface side of the drive circuit board 12 is bent, and the back surface side of the FPC 16 is connected to the back surface side of the glass substrate 2. Even the EL module 1 can be applied.
[0046]
【The invention's effect】
According to the present invention, the light-emitting portion provided on the translucent substrate is covered with a cap body having conductivity, the cap body is disposed on the translucent substrate, and the tape body is connected to the cap body. By connecting the body to the circuit board that controls the light emission of the light emitting unit, the cap body and the circuit board are connected by a tape body, so that mechanical contact between the circuit board and the cap body can be further prevented, resulting in a smaller size. In addition, since the tape body has conductivity, the cap body is grounded, so that the generation of radiation noise from the circuit board can be suppressed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of an electroluminescence display device of the present invention.
FIG. 2 is a cross-sectional view showing another embodiment of the electroluminescence display device.
FIG. 3 is a cross-sectional view showing still another embodiment of the electroluminescence display device.
FIG. 4 is a cross-sectional view showing a second embodiment of the present invention.
FIG. 5 is a cross-sectional view showing another embodiment of the electroluminescence display device.
FIG. 6 is a cross-sectional view showing still another embodiment of the electroluminescent display device.
FIG. 7 is a cross-sectional view showing a third embodiment of the present invention.
FIG. 8 is a cross-sectional view showing another embodiment of the electroluminescent display device.
FIG. 9 is a sectional view showing still another embodiment of the electroluminescence display device.
FIG. 10 is a developed front view showing another embodiment of the present invention.
FIG. 11 is a side view of the same electroluminescence display device.
FIG. 12 is a developed front view showing still another embodiment of the present invention.
FIG. 13 is a side view of the same electroluminescent display device.
FIG. 14 is a developed front view showing still another embodiment of the present invention.
FIG. 15 is a side view of the same electroluminescent display device.
FIG. 16 is a developed front view showing still another embodiment of the present invention.
FIG. 17 is a side view of the same electroluminescent display device.
[Explanation of symbols]
2 Glass substrate as translucent substrate 3 EL portion as light emitting portion 5 Ground electrode 6 Metal cap as cap body
11 Insulation sheet as a sheet
12 Driving circuit board
14 Conductive tape as a tape body
19 Conductive paste as paste

Claims (7)

A translucent substrate;
A light emitting portion provided on the light transmitting substrate;
A cap body having conductivity disposed on the translucent substrate covering the light emitting portion;
A tape body having conductivity connected to the cap body;
A flat display device comprising: a circuit board connected to the tape body and controlling light emission of the light emitting unit. The flat display device according to claim 1, further comprising a sheet body provided on the cap body and insulating between the cap body and the circuit board. The flat display device according to claim 1, wherein the circuit board is spaced apart from the cap body. 4. The flat display device according to claim 1, wherein the tape body is connected to the back surface of the circuit board. It comprises a ground electrode provided on a translucent substrate that is on the side of the light emitting part,
The flat display device according to claim 1, wherein the cap body is connected to the ground electrode. A ground electrode provided on the translucent substrate that is on the side of the light emitting unit;
The flat display device according to any one of claims 1 to 4, further comprising a conductive paste body in which a cap body is connected to the ground electrode. The light emitting unit of the flat display device according to any one of claims 1 to 5 is an electroluminescence element,
The electroluminescence element is an electroluminescence display device in which light emission is controlled by a circuit board.

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