JP2822755B2 - EL display device - Google Patents

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 using an EL (electroluminescence) element which emits light when an AC voltage is applied.

[0002]

2. Description of the Related Art Conventionally, an EL display device having a pair of electrodes formed on both surfaces of an EL light emitting layer has been known. In this type of EL display device, when an AC voltage is applied between a pair of electrodes, the EL light emitting layer emits light, and characters and the like can be displayed.

However, Zn used as an EL light emitting layer
Since S is also a piezoelectric material, it vibrates when an AC voltage is applied, and this vibration becomes noise. Therefore, various measures have conventionally been taken to prevent noise in this type of EL display device. For example, JP-A-63-6128
As described in Japanese Patent Publication No. 5 and JP-B-63-30745, a spacer is provided between a frame of an EL display device and an EL light-emitting layer, and the frame is hermetically sealed.
An apparatus that prevents noise generated by the L light emitting layer from leaking out of the frame has been considered.

As described in Japanese Patent Application Laid-Open No. 63-249895, in an EL display device in which an EL light emitting layer emits light by applying a rectangular wave AC voltage, noise is prevented by smoothing the voltage waveform. Is also considered.

[0005]

However, in an EL display device in which a spacer is provided between the frame and the EL light emitting layer, the frame needs to be formed as large as the spacer. Therefore, the size of the EL display device is increased, and there are cases where the devices to which the device can be applied are limited.

[0006] On the other hand, E for smoothing a rectangular waveform
In the L display device, the vibration component may not be removed properly depending on the frequency of the vibration component. That is, high-frequency vibration components generated at the rise and fall of the rectangular wave voltage can be removed satisfactorily, but low-frequency vibration components corresponding to the period of the rectangular wave voltage cannot be sufficiently removed. For this reason, the vibration component with the largest noise cannot always be removed, and the noise cannot be sufficiently prevented.

Accordingly, an object of the present invention is to provide an EL display device which can effectively prevent noise without increasing the size of the device.

[0008]

According to a first aspect of the present invention, there is provided an EL device comprising a pair of electrodes formed on both surfaces of an EL light-emitting layer, wherein an EL element is provided between the pair of electrodes. In an EL display device in which the EL light emitting layer emits light by applying an AC voltage, a plurality of the EL elements are arranged in parallel with the EL light emitting layers, and at least between the pair of electrodes of one EL element. comprising a voltage application means for applying an AC voltage having different phases to each of the other one of said EL element, said voltage application means is less
The light emission start voltage of the EL element is
That the lower pressure alternating voltage is can be applied are the Abstract. Claim 2 made to achieve the above object.
According to the invention described above , a pair of electrodes are formed on both surfaces of the EL light emitting layer.
And an AC voltage applied between the pair of electrodes.
EL display in which the above EL light emitting layer emits light when added
In the device, the EL element may be set in parallel with the EL light emitting layer.
And a plurality of EL elements,
An electrode having an absolute value larger than the first voltage between the pair of electrodes.
Vibrates when pressure is applied, and the second voltage is higher than the first voltage.
When a voltage having an absolute value greater than the voltage of 2 is applied
It has the property of emitting light, and the plurality of EL elements
The second element is provided between the pair of electrodes of one EL element.
The first drive as an AC voltage having an absolute value equal to or greater than the
At the same time as applying the dynamic voltage, of the plurality of EL elements,
The first electrode is provided between the pair of electrodes of another EL element.
Has an absolute value larger than the voltage of the second voltage and smaller than the second voltage.
And an AC power having a phase different from that of the first drive voltage.
Voltage applying means for applying a second driving voltage as a pressure,
The gist is to be prepared. In addition,
The invention according to claim 3, which has been made to achieve the above, comprises an EL light emitting layer
An EL element having a pair of electrodes formed on both surfaces is provided.
By applying an AC voltage between a pair of electrodes, the EL
In the EL display device in which the light emitting layer, the EL onset
A plurality of the EL elements are provided in parallel with the light layers being parallel,
The plurality of EL elements emit predetermined light between the pair of electrodes.
When a voltage having an absolute value equal to or greater than the start voltage is applied,
And emits light at the same time.
When only the applied voltage is applied, only vibration
Out of the plurality of EL elements,
Has an absolute value between the pair of electrodes that is equal to or higher than the emission start voltage.
At the same time as applying the first drive voltage as an AC voltage
And the other one of the plurality of EL elements
Between the pair of electrodes, the other one EL element is not emitted.
When making light, an absolute value smaller than the above-mentioned light emission starting voltage
AC having a different phase from the first drive voltage
A second drive voltage as a voltage is applied, and the other one
When making the EL element emit light, the light emission starting voltage or more
It has an absolute value and a phase difference from the first drive voltage.
Voltage mark for applying a third driving voltage as an alternating voltage
The gist is to provide additional means.

[0009]

According to the first aspect of the present invention, the plurality of EL elements are connected to electrodes provided on both surfaces of the EL light emitting layer by applying an AC voltage higher than a light emission starting voltage from a voltage applying means to emit light. I do. EL light emitting layer by application of an AC voltage, oscillating in co Upon emission. Here, the voltage application
The step is provided between a pair of electrodes of one EL element and at least the other.
Apply an AC voltage having a phase different from that of one EL element,
At least one EL element electrode has an EL element
An AC voltage lower than the starting voltage can be applied. Yo
And an AC voltage lower than the emission start voltage of the EL element is applied.
The EL element does not emit light but is different from other EL elements.
Oscillates at different phases. Therefore, the phases of the vibrations generated by the two EL elements are also different. Further, since the EL light emitting layers of both EL elements are arranged in parallel with each other, vibrations generated by both EL elements interfere with each other. As a result, the vibration of the entire EL display device is reduced, and noise can be satisfactorily prevented.

[0010] According to the second aspect of the present invention, a plurality of devices are provided.
The applied EL element has a voltage higher than the first voltage applied to the pair of electrodes.
Vibrates when a voltage having an absolute value is applied, and the first voltage
A voltage having an absolute value not less than a second voltage higher than the voltage
It has the property of emitting light when pressed. This plurality of EL elements
Among them, the second voltage or lower is applied between a pair of electrodes of one EL element.
The first drive voltage as an AC voltage having the above absolute value is
When applied, this one EL element emits light and vibrates.
I do. Here, the voltage applying means is a pair of other EL elements.
Higher than the first voltage and lower than the second voltage between the electrodes
It has an absolute value and is different in phase from the first drive voltage
A second drive voltage as an AC voltage is applied. Therefore,
The EL element to which the second drive voltage has been applied does not emit light.
Has a phase different from that of the EL element to which the first drive voltage is applied.
Vibrates at For this reason, the vibrations generated by both EL elements are mutually
Interfere with each other. As a result, the vibration of the EL display device as a whole is
Movement is reduced, and noise can be effectively prevented. Ma
According to the third aspect of the present invention, a plurality of EL elements are juxtaposed.
Has an absolute value equal to or higher than the light emission starting voltage between the pair of electrodes.
Vibrates and emits light when voltage is applied, and starts emitting light
Vibration when voltage with absolute value less than voltage is applied
Only. Of the plurality of EL elements, one of the EL elements
An electrode having an absolute value equal to or higher than the light emission starting voltage between a pair of electrodes.
When the first drive voltage is applied as a current voltage, this one
EL elements emit light and vibrate. Where the other
In the case where one of the EL elements does not emit light,
Is higher than the light emission starting voltage between a pair of electrodes of the EL element.
It has a small absolute value and is in phase with the first drive voltage.
A second drive voltage as a different AC voltage is applied. No.
Although the EL element to which the driving voltage of No. 2 is applied does not emit light,
In a phase different from that of the EL element to which the first drive voltage is applied
Vibrate. Further, the other one EL element emits light.
In such a case, the voltage applying means sets an absolute value equal to or higher than the light emission starting voltage.
AC power having a phase different from that of the first drive voltage.
A third driving voltage as a pressure is applied. Third drive voltage
The EL element to which light is applied emits light and has the first drive voltage.
It vibrates at a phase different from that of the EL element to which the pressure is applied. This
Therefore, even when the other EL element emits light,
In the case of light, the vibrations generated by both EL elements interfere with each other.
Fit. As a result, vibration of the entire EL display device is reduced.
Thus, noise can be prevented well.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings.
First, prior to the description of the embodiments, it is necessary to understand the present invention.
A possible reference example will be described. FIG. 1 is a cross-sectional view illustrating an EL display device 1 according to a first reference example . E as shown
The L display device 1 includes a first transparent electrode 5, a first insulating layer 7, a first EL light emitting layer 9, a second insulating layer 11, and a second transparent electrode 5 on a glass substrate 3.
Transparent electrode 13, third insulating layer 15, second EL light emitting layer 17,
The fourth insulating layer 19 and the back electrode 21 are sequentially laminated. The first transparent electrode 5 and the second transparent electrode 13
I. T. O. (Insium Tin Oxide),
The back electrode 21 is made of a transparent material such as ZnO or ZnO doped with Ga. T.
It is composed of O, ZnO or the like. The first EL light emitting layer 9 and the second EL light emitting layer 17 are made of a light emitting material such as ZnS to which Mn, TbOF or the like is added as a light emitting center. Further, the first insulating layer 7, the second insulating layer 11, the third insulating layer 1
The fifth and fourth insulating layers 19 are made of Ta2 O5, alumina, S
It is composed of i3N4 and the like.

For this reason, when an AC voltage higher than the light emission start voltage of the first EL light emitting layer 9 is applied between the first transparent electrode 5 and the second transparent electrode 13, the first EL light emitting layer 9 emits light. Similarly, between the second transparent electrode 13 and the back electrode 21, the second E
When an AC voltage higher than the light emission start voltage of the L light emitting layer 17 is applied, the second EL light emitting layer 17 emits light . The first transparent electrode 5 and its, one EL element 23 is formed at the 1EL emitting layer 9, and a second transparent electrode 13, the second transparent electrode 13, the 2EL
Another EL element 25 is formed by the light emitting layer 17 and the back electrode 21.

The first transparent electrode 5 and the back electrode 21 include:
An AC voltage described below is applied from a voltage application circuit 31 as voltage application means shown in FIG. 2, and a ground electrode (not shown) is connected to the second transparent electrode 13. Next, the configuration of the voltage application circuit 31 will be described with reference to FIG.

First, the voltage application circuit 31 has three input terminals N1, N2, N3 and an output terminal S1. Each of the input terminals N1, N2, N3 is a C-MOS (not shown).
The output terminal S <b> 1 is connected to the back electrode 21 and the first transparent electrode 5.

The output terminal S1 is connected to FET33 and FET3.
5 is connected to the drain electrode of the FET 39 via the diode 37, and to the drain electrode of the FET 45 via the diode 43, respectively. The diode 37 is connected from the output terminal S1 to the FET.
The polarity of the diode 43 is determined in such a direction as to block the current from the FET 45 to the output terminal S1.

Next, the FET 33 is connected to the high voltage electrode H1 by FE.
T35 is connected to the low-voltage electrode L1, the FET 39 and the FET 45
Are connected to a ground electrode 47 and a ground electrode 49, respectively. FET33, FET
Zener diodes 51, 53, and 55 are connected between 35 and the gate and source of the FET 39. These Zener diodes 51 to 55 break down when the gate-source voltage becomes a predetermined voltage, and each F
It protects ET. In addition, FET45 is 0-5
This type of zener diode is not necessary because a switchable one is applied by a digital signal of V.

Next, an input terminal N1 is connected to the gate electrode of the FET 33 via an inverter 57 and a capacitor 59. Here, while the digital signal of the MOS applied to the input terminal N1 is 0 to 5 V, the output terminal S1
, The driving potential of the EL element 25 sometimes reaches several hundred volts. The capacitor 59 protects the MOS from such a high potential by blocking the DC component of the current.

Similarly, the input terminal N3 is connected to the gate electrode of the FET 35 via the driver 61 and the capacitor 63, and the input terminal N2 is connected to the gate electrode of the FET 39 via the inverter 65 and the capacitor 67. The input terminal N2 is connected to the gate electrode of the FET 45 via the driver 69.

The gate potential of the FETs 33 and 39 is Lo.
A so-called p-type channel FET that turns on at w level
The FETs 35 and 45 are so-called n-channel FETs that turn on when the gate potential is at the high level. Next, the operation of the EL display device 1 configured as described above will be described. First, the voltage application circuit 31 operates as follows.

Driving signals (input 1, input 2, input 3) illustrated in FIG. 3 are input to the input terminals N1, N2, and N3 from the MOS, respectively. First, when the input 2 is at the high level, the gate potential of the FET 39 is at the low level,
FET 39 is turned on. The gate potential of the FET 45 is at the high level, and the FET 45 is also turned on. Therefore, the output terminal S1 is connected to the ground electrodes 47, 4
Conduction with 9.

At this time, input 1 and input 3 are both
Low level. Since input 1 is at low level, the gate potential of FET 33 goes to high level and FE
T33 is turned off. Further, since the input 3 is at the low level, the gate potential of the FET 35 is at the low level, and the FET 35 is also turned off. Therefore, the output terminal S1 is insulated from the high-voltage electrode H1 and the low-voltage electrode L1, and the driving signal (hereinafter referred to as output 1) output from the output terminal S1 is 0V.

At time A after a predetermined time has elapsed, input 1 goes high and input 2 goes low. When the input 1 goes high, the FET 33 turns on, and the output terminal S1 is electrically connected to the high voltage electrode H1. When the input 2 goes low, the FETs 39 and 45 are turned off, and the output terminal S1 is insulated from the ground electrodes 47 and 49. Further, since the input 3 is held at the low level and the FET 35 is kept turned off, the output 1 becomes the high potential VH1 of the high voltage electrode H1.

Next, at time B, input 1 goes low and input 2 goes high. That is, input 1
3 becomes the state before the time point A, the output 1 becomes 0V. Further, at time point C, input 3 goes high and input 2 goes low. When the input 3 goes high, the FET 35 is turned on, and the output terminal S1 is electrically connected to the low-voltage electrode L1. When the input 2 goes low, the output terminal S1 is insulated from the ground electrodes 47 and 49 as described above. Further, input 1 is kept at low level and FET3
3 remains turned off, the output 1 becomes the low potential VL1 of the low voltage electrode L1.

Subsequently, at the time point D, the inputs 1 to 3 are in the state before the time point A, and the output 1 becomes 0V. Hereinafter, this operation is repeated. The diode 37 prevents the reverse bias voltage from being applied to the FET 39 when the FET 33 is turned on, and the diode 43 prevents the reverse bias voltage from being applied to the FET 45 when the FET 35 is turned on.

When such an output 1 is input to the first transparent electrode 5 and the back electrode 21, the second transparent electrode 13 is maintained at 0 V as described above. An AC voltage shown in (c) is applied, and an AC voltage shown in FIG.
In other words, any of the AC voltages is spaced at a predetermined interval to a high potential VH1.
And a low-potential VL1 alternately form a rectangular wave alternating voltage, and the two alternating voltages have phases inverted from each other.

For this reason, the sound pressure of the vibration generated by the first EL light-emitting layer 9 changes as shown in FIG. 4D, and the sound pressure of the vibration generated by the second EL light-emitting layer 17 is shown in FIG. To change. That is, the sound pressure of the first EL light-emitting layer 9 and the sound pressure of the second EL light-emitting layer 17 have phases inverted from each other, similarly to the AC voltage.

As a result, the two vibrations interfere with each other, and the sound pressure of the synthesized vibration becomes zero as shown in FIG. Therefore, it is possible to favorably suppress the EL display device 1 from generating noise. Further, in the EL display device 1 of the present reference example, since the two EL light emitting layers 9 and 17 are stacked one upon another and a voltage is applied simultaneously, the luminous intensity seen from the glass substrate 3 side is doubled. Because it is formed further on the EL element is typically a thin film, even if the EL element as in the present embodiment a plurality of stacked, EL display device 1 does not become so large.

In the above reference example, the second transparent electrode 13 is connected to the ground electrode, and the first transparent electrode 5 and the back electrode 2 are connected.
1 is connected to the output terminal S1, but the same operation and effect can be obtained by connecting the second transparent electrode 13 to the output terminal S1 and connecting the first transparent electrode 5 and the back electrode 21 to the ground electrode. can get.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 shows an EL display device 201 of a second reference example.
FIG. As shown in FIG.
Reference numeral 1 denotes a first transparent electrode 205 and a first transparent electrode 205 on a glass substrate 203.
Insulating layer 207, first EL light emitting layer 209, second insulating layer 21
1, second transparent electrode 213, third insulating layer 215, third transparent electrode 217, fourth insulating layer 219, second EL light emitting layer 22
The first insulating layer 223 and the back electrode 225 are sequentially laminated. Each electrode (205, 213, 21)
7,225) insulating layer (207, 211, 215, 21)
9) and the EL light emitting layers (209, 221) used the same materials as in the first reference example.

Therefore, when an AC voltage higher than the light emission start voltage of the first EL light emitting layer 209 is applied between the first transparent electrode 205 and the second transparent electrode 213, the first EL light emitting layer
Emits light. Similarly, the third transparent electrode 217 and the back electrode 22
When an AC voltage equal to or higher than the light emission start voltage of the second EL light emitting layer 221 is applied between the second EL light emitting layer 221 and the light emitting element 5, the second EL light emitting layer 221 emits light. That is, the first transparent electrode 205, the first insulating layer 207, the first
A first EL element 227 is formed by the EL light emitting layer 209, the second insulating layer 211, and the second transparent electrode 213, and the third transparent electrode 217, the fourth insulating layer 219, and the second EL light emitting layer 22 are formed.
The first EL element 229 is formed by the first, fifth insulating layer 223 and back electrode 225.

Next, an AC voltage as described below is applied to the first to third transparent electrodes 205 to 217 and the back electrode 225 from a voltage application circuit 231 as voltage application means shown in FIG. Next, referring to FIG.
31 will be described. First, the voltage application circuit 231 has two input terminals N4 and N5 and four output terminals S3 and S5.
4, S5, and S6. Each input terminal N4
N5 is a not-shown C-MOS logic IC (hereinafter simply referred to as M
OS), and the output terminal S3 is connected to the back electrode 22.
5, the output terminal S4 is connected to the third transparent electrode 217, the output terminal S5 is connected to the second transparent electrode 213, and the output terminal S6 is connected to the first transparent electrode 205.

The output terminal S3 is connected to the FET 233 and the FET
The source electrode of the FET 233 is connected to the high-voltage electrode H3, and the source electrode of the FET 235 is connected to the low-voltage electrode L3. Also F
A Zener diode 25 for protecting each FET is provided between the gate and source of the ET 233 and the FET 235.
1 and 253 are connected.

Next, the gate electrodes of the FETs 233 and 235 are connected to one ends of capacitors 255 and 259 for cutting off the DC component of the current, and the other end of each of the capacitors 255 and 259 is connected to the input terminal N4 of the inverter 261. Connected through.

The FET 233 is a so-called p-channel FET which is turned on when the gate potential is at a low level.
The FET 235 is a so-called n-channel FET that turns on when the gate potential is at the high level. Also here
A circuit provided between the inverter 261 and the output terminal S3 is referred to as a basic circuit K1, a portion connected to the output terminal S3 of the basic circuit K1 is referred to as an output unit K1a, and a portion connected to the inverter 261 is referred to as an input unit K1b.

The output terminal S4 is connected to an output section K2a of a basic circuit K2 constructed in the same manner as the basic circuit K1, and an input terminal N5 is connected to an input section K2b of the basic circuit K2 via an inverter 263. I have. The output terminal S5 is connected to the output section K of the basic circuit K3 configured in the same
3a is connected, and an input terminal N4 is connected via a driver 265 to an input section K3b of the basic circuit K3.
Further, the output terminal S6 is connected to the output section K4a of the basic circuit K4 configured similarly to the basic circuit K1, and the input terminal N5 is connected via the driver 267 to the input section K4b of the basic circuit K4.

Next, the EL display device 2 configured as described above
01 will be described. First, the voltage application circuit 231 operates as follows. Drive signals (input 4 and input 5) illustrated in FIG. 7 are input from the MOS to the input terminals N4 and N5, respectively. First, when the input 4 is at the low level, a high-level signal is input to the input unit K1b. Therefore, the gate potentials of the FETs 233 and 235 also become High level. Therefore, the FET 233 is turned off and the FE
T235 is turned on. Therefore, the output terminal S3 is insulated from the high-voltage electrode H3, is electrically connected to the low-voltage electrode L3, and outputs a drive signal (hereinafter, output 3) output from the output terminal S3.
) Is the low potential VL3 of the low voltage electrode L3.

At the time point E after a predetermined time has elapsed, the input 4 goes high. When input 4 goes high,
The FET 233 turns on and the FET 235 turns off. Then, the output terminal S3 is electrically connected to the high voltage electrode H3 and is insulated from the low voltage electrode L3. Therefore output 3
Becomes the high potential VH3 of the high voltage electrode H3. That is, the basic circuit K
1, when a high-level signal is input to the input unit K1b, the output unit K1a becomes the low potential VL3, and the input unit K1b
When a low level signal is input, the output section K1a becomes the high potential VH3.

On the other hand, the input 5 is also at the low level before the time point E, and since the input 5 is input to the basic circuit K2 connected to the output terminal S4 via the inverter 263, the drive signal output from the output terminal S4 is output. (Hereinafter, described as output 4) is a low potential VL3 before time E.

Since the input 4 is input to the basic circuit K3 connected to the output terminal S5 via the driver 265, the drive signal output from the output terminal S5 (hereinafter referred to as output 5)
Represents a change completely inverted from the output 3. Similarly, since the input 5 is also input to the basic circuit K4 connected to the output terminal S6 via the driver 267, the drive signal output from the output terminal S6 (hereinafter referred to as output 6) is completely inverted from the output 4. Shows the changes made. That is, before the time point E, the outputs 5 and 6 are both at the high potential VH3, and at the time point E, the output 5 is at the low potential VL3.

Subsequently, when the input 5 goes high at time F, a low level signal is input to the basic circuit K2,
The output 4 becomes the high potential VH3. Output 6 at the same time
Becomes the low potential VL3. Input 4 and input 5 are High
After the level state is maintained for a while, when the input 4 becomes low level at time point G, a high level signal is input to the basic circuit K1. Therefore, the output 3 becomes the low potential VL3 again, and at the same time, the output 5 becomes the high potential VH3. Subsequently, at time H, input 5 goes low, and inputs 4 and 5 are in a state prior to time E.
Therefore, the output 4 becomes the low potential VL3 again, and at the same time, the output 6 becomes the high potential VH3. Input 4 and input 5
After the state where is at the low level is maintained for a while, the above operation is repeated.

When the outputs 3 to 6 are input to the back electrode 225 and the transparent electrodes 217 to 205, the first EL
The AC voltage (hereinafter referred to as driving 1 and driving 2) for driving the light emitting layer 209 and the second EL light emitting layer 221 changes as follows. First, since the outputs 3 and 4 are both at the low potential VL3 before the time point E, the driving 2 is at 0V. Similarly, since output 5 and output 6 are both at the high potential VH3, drive 1 is also 0
V. At the time point E, the output 3 becomes the high potential VH3 and the output 4 remains at the low potential VL3, so that the drive 2 becomes VH3-VL3 (this is VH4). On the other hand, since the output 5 becomes the low potential VL3 and the output 6 remains at the high potential VH3, the driving 1 becomes -VH4.

At the time point F, the output 3 and the output 4 are both at the high potential VH3, so that the drive 2 is at 0V. Similarly, the outputs 5 and 6 both have the low potential VL3, so that the driving 1 also has 0V. Further, at the time point G, the output 3 becomes low potential VL3
Since the output 4 remains at the high potential VH3, the drive 2 becomes -VH4. On the other hand, since the output 5 becomes the high potential VH3 and the output 6 remains at the low potential VL3, the drive 1 becomes VH4. Then, the state returns to the state before the point E at the point H, and this change is repeated thereafter.

As a result, the driving 1 and the driving 2 each become a rectangular wave AC voltage in which pulses of VH4 and −VH4 are alternately repeated at predetermined intervals, and the driving 1 and the driving 2
Are in phases opposite to each other. For this reason, E of this reference example
In the L display device 201, the generation of noise can be prevented as in the first reference example, and the luminous intensity viewed from the glass substrate 203 side is doubled.

It should be noted in the above reference example, as in the EL display device 301 has been stacked on top of two EL elements on one surface of the glass substrate 3 or 203 third reference example shown in FIG. 8, both surfaces of the glass substrate 303 Alternatively, two EL elements may be stacked. That is, in the EL display device 301, the first transparent electrode 305 and the first insulating layer 30 are formed on one surface of the glass substrate 303.
7, a first EL light emitting layer 309, a second insulating layer 311 and a back electrode 313 are sequentially laminated, and a first EL element 315 is formed.
Is formed. On the other surface of the glass substrate 303, a second transparent electrode 317, a third insulating layer 319, a second EL light emitting layer 321, a fourth insulating layer 323, and a third transparent electrode 325 are provided.
Are sequentially stacked so as to overlap the EL element 315, and the second
EL element 327 is formed.

The EL display device 301 thus configured
Then, an image is displayed on the third transparent electrode 325 side. Then, the first EL light emitting layer 309 and the second EL light emitting layer 321
By applying alternating voltages of opposite phases,
As in the first and second reference examples, noise can be satisfactorily prevented.

Further, in each of the above-mentioned reference examples, two EL elements are stacked and stacked, but more EL elements may be stacked and stacked. FIG. 9 shows a fourth example in which four EL elements are stacked and stacked.
It is sectional drawing showing the EL display device 401 of a reference example. As shown in the figure, a glass substrate 403
The first EL element 405, the first insulating layer 407, the second EL
Element 409, second insulating layer 411, third EL element 413,
The third insulating layer 415 and the fourth EL element 417 are sequentially laminated.

The EL display device 401 thus configured
By applying an AC voltage having a phase opposite to that of the remaining half of the EL elements (for example, the second EL element 409 and the fourth EL element 417) to half of the EL elements (for example, the first EL element 405 and the third EL element 413). , Noise can be effectively prevented. Also, the EL display device 401
By applying an AC voltage only to some of the EL elements (for example, the first EL element 405 and the second EL element 409), the luminous intensity viewed from the glass substrate 403 side can be adjusted.

Also, an EL display device in which a large number of EL elements are stacked one on another can be constructed by providing an electrode shared by a pair of EL elements in a stacked state, as in the first reference example. . In the EL display device 501 of the fifth reference example shown in FIG. 10, a first EL element 505, a second EL element 507, an insulating layer 509, and a third EL element are formed on a glass substrate 503.
An element 511 and a fourth EL element 513 are sequentially stacked. Then, the first EL element 505 and the second EL element 5
07 share the transparent electrode 515 and the third EL element 5
11 and the fourth EL element 513 share the transparent electrode 517.

In each of the above reference examples, a plurality of EL elements are stacked one upon another. However, noise can be similarly prevented even when a plurality of EL elements are adjacent on the same plane. Next, various reference examples adjacent to the EL element will be described. FIG. 11 is a sectional view showing an EL display device 601 according to a sixth reference example. In the EL display device 601, a first transparent electrode 605 and a second transparent electrode 607 are laminated on a surface of a glass substrate 603 at a predetermined interval, and the first transparent electrode 605, the second transparent electrode 607, and both transparent electrodes 605, The first insulating layer 611 is laminated on the surface of the glass substrate 603 exposed from between the portions 607.

On the surface of the first insulating layer 611, a first EL light emitting layer 613 and a second EL light emitting layer 615 are spaced apart from each other at the above-mentioned predetermined distance, and the first transparent electrode 605 and the second transparent electrode 60, respectively.
7 so as to overlap. Further, the second insulating layer 619 and the back electrode 621 are sequentially laminated on the surface of the first insulating layer 611 exposed from between the first and second EL emitting layers 613, 615 and 613, 615. Have been.

The first transparent electrode 605 is connected to a voltage application circuit (not shown) configured similarly to the voltage application circuit 31 of FIG. 2, the second transparent electrode 607 is connected to a ground electrode (not shown), and The electrode 621 is electrically open. Here, the voltage application circuit is configured to apply to the first transparent electrode 605 an AC voltage twice as large as the emission start voltage of the first EL light emitting layer 613 and the second EL light emitting layer 615.

That is , the first transparent electrode 605 and the second transparent electrode 607 correspond to the individual electrodes, and the back electrode 621 corresponds to the common electrode. Also, the EL display device 601 of the present reference example.
Now, the first transparent electrode 605, the first insulating layer 611, and the first E
L light emitting layer 613, second insulating layer 619, and back electrode 6
21, the first EL element 623 is formed, and the second transparent electrode 6 is formed.
07, the first insulating layer 611, the second EL light emitting layer 615, the second
A second EL element 625 is formed using the insulating layer 619 and the back electrode 621.

The EL display device 601 thus configured
Then, when an AC voltage is applied between the first transparent electrode 605 and the second transparent electrode 607, the back electrode 621 has an intermediate potential. Therefore, when an AC voltage having a phase inverted from each other and higher than the light emission start voltage of the EL light emitting layers 613 and 615 is applied to the EL light emitting layers 613 and 615, the EL light emitting layers 613 and 615 emit light and the EL light emitting layers 613 and 615 emit light in FIG. As described above, the sound pressures of the vibrations generated by the EL light emitting layers 613 and 615 have phases opposite to each other. For this reason, it is possible to favorably suppress the two vibrations from interfering with each other and generating noise from the EL display device 601.

In the above reference example, the back electrode 621 is opened and an AC voltage is applied between the first transparent electrode 605 and the second transparent electrode 607. 2 transparent electrode 607-back electrode 621
An AC voltage may be individually applied during the period.

FIG. 12 shows a voltage application circuit 701 of the seventh reference example.
It is an electric circuit diagram showing. In the present embodiment, by connecting the back electrode 621 of the EL display device 601 to the ground electrode, the first transparent electrode 605 to the output terminal S7 in the voltage application circuit 701,
The second transparent electrode 607 is connected to the output terminal S8. The voltage application circuit 701 includes input terminals N6, N7,
A circuit 703 connected between N8 and the output terminal S7,
The circuit 705 is connected between the input terminals N6, N7, N8 and the output terminal S8.

The circuits 703 and 705 are configured in the same manner as the voltage application circuit 31 except for the following points. Therefore, the detailed description of the configuration is given by assigning the same reference numerals to the same members as those of the voltage application circuit 31. Is omitted. That is, the circuit 703 includes an input terminal N6 for the inverter 57, an input terminal N7 for the inverter 65 and the driver 69, and an input terminal N8 for the driver 61.
Are connected to each other, and the configuration is exactly the same as that of the voltage application circuit 31 except that the output terminal S7 is connected to the drain electrodes of the FET 33 and the FET 35.

In the circuit 705, the input terminal N8 is connected to the inverter 57, the input terminal N7 is connected to the inverter 65 and the driver 69, the input terminal N6 is connected to the driver 61, and the output terminal S8 is connected to the drain electrodes of the FET 33 and the FET 35. Further, the configuration is exactly the same as the voltage application circuit 31 except that the high voltage electrode H2 is connected to the source electrode of the FET 33 and the low voltage electrode L2 is connected to the source electrode of the FET 35.

The voltage application circuit 701 thus configured
When the same drive signals as inputs 1 to 3 and inputs 6 to 8 in FIG. 3 are input to the input terminals N6 to N8, output terminals S7 and S8
The drive signal output 7 and output 8 output from are changed as illustrated in FIG. That is, since the circuit 703 is configured in the same manner as the voltage application circuit 31, the output 7 is a rectangular wave signal in which pulses of the high potential VH1 and the low potential VL1 are alternately repeated at predetermined intervals. On the other hand, the circuit 705
The input 6 and the input 8 are switched with respect to the circuit 703, and the high voltage electrode H1 is substituted for the high potential VH1 of the high voltage electrode H1.
2, the low potential VL2 of the low voltage electrode L2 is input instead of the low potential VL1 of the low voltage electrode L1. Therefore, the output 8 has a phase inverted from that of the output 7, and is a rectangular wave signal in which pulses of the high potential VH2 and the low potential VL2 are alternately repeated.

Here, VH1 = -VL1 = VH2 = -VL
2, the first EL light emitting layer 613 and the second EL light emitting layer 6
15 and 15 can be applied with alternating voltages of the same magnitude, the phases of which are reversed. Therefore, in this way, it is possible to favorably suppress the EL display device 601 from generating noise.

In the above reference example, the first and second transparent electrodes 605 and 607, the first and second EL
By sequentially laminating the light emitting layers 613, 615 and the back electrode 621, the EL elements 623 and 625 are adjacent to each other.
Various other configurations are conceivable as a configuration in which a plurality of EL elements are adjacent to each other.

For example, E in the eighth reference example illustrated in FIG.
In the L display device 801, a first transparent electrode 805 and a second transparent electrode 807 are stacked on a surface of a glass substrate 803 at a predetermined interval, and a first insulating layer 809 and an EL light emitting layer 81 are formed on the surface.
A first insulating layer 813 and a back electrode 815 are sequentially stacked. Thereby, the EL display element 81
7,819 are adjacent. This EL display device 801
The EL display device 601 differs from the EL display device 601 in that the L light emitting layer 811 is shared by the EL elements 817 and 819.
The same operation and effect as those of No. 1 are obtained.

The EL of the ninth reference example illustrated in FIG.
The display device 901 is configured as follows. A transparent electrode 905 and a first insulating layer 907 are sequentially laminated on a glass substrate 903, and the first EL light emitting layer 909 and the second
EL light emitting layers 911 are stacked at predetermined intervals. Furthermore, each EL
The second insulating layer 913 is laminated on the surfaces of the light emitting layers 909 and 911, and the first back electrode 915 and the second back electrode 91
7 are stacked on the first EL layer 909 and the second EL layer 911. Thereby, the EL element 921,
923 are adjacent. The EL display device 901 differs from the EL display device 601 in that the transparent electrode 905 is used as a common electrode and the back electrodes 915 and 917 are used as individual electrodes.
It has the same function and effect.

The EL display device 1001 of the tenth reference example shown in FIG. 16 has an EL light emitting layer 1009 and a second insulating layer 1013.
Are sequentially stacked on the first insulation 907 to form the EL element 102.
EL display device 9 except that it was shared by 1,1023
01, the reference numerals representing the respective parts are E
The same reference numerals as in the L display device 901 denote the same parts, and a detailed description of the configuration will be omitted. In this case, the same operation and effect can be obtained.

A transparent electrode, an EL light emitting layer, and a back electrode can be individually provided for adjacent EL light emitting elements. EL display device 110 of an eleventh reference example shown in FIG.
1 is configured as follows. That is, the glass substrate 11
03 surface, the first transparent electrode 1105, the second transparent electrode 11
07 are stacked at predetermined intervals, and the first insulating layer 11
09 are stacked. The surface of the first transparent electrode 11
A first EL light-emitting layer 1111 overlapping with the first transparent electrode 05 and a second EL light-emitting layer 1113 overlapping with the second transparent electrode 1107 are stacked, and a second insulating layer 1115 is stacked on the surface thereof.
Further, the first EL light emitting layer 1 is provided on the surface of the second insulating layer 1115.
A first back electrode 1117 overlapping with the first electrode 111, and a second EL
A second back electrode 1119 that overlaps with the light emitting layer 1113 is stacked, so that the EL light emitting elements 1121 and 1123 are adjacent to each other.

The EL display device 110 thus configured
In 1, the AC voltage can be applied using the voltage application circuit 231 described in FIG. That is, the first transparent electrode 1
105 to the output terminal S3, the first back electrode 1117 to the output terminal S4, the second transparent electrode 1107 to the output terminal S5,
What is necessary is just to connect the 2nd back electrode 1119 to the output terminal S6, respectively. By doing so, each EL light emitting layer 11
It is possible to apply a rectangular wave AC voltage of the phase that is reversed with each other to 11,1113, the same operation and with the respective reference examples
The effect is obtained.

In the sixth to eleventh reference examples, EL
The elements are arranged adjacent to each other in two rows.
8 (a) (the EL display device 1101 is shown as an example). In the present invention, EL elements can be adjacent to each other in various arrangements. For example, FIG.
As illustrated in (b), a rectangular EL element 1151
And approximately 1/1 / EL element 1151
The EL display device 1155 may be constituted by a pair of EL elements 1153 having a width of 2. In this case, by applying an AC voltage having a phase opposite to that of the EL element 1151 to the EL element 1153, the same operation and effect as in each of the above reference examples can be obtained.
The effect is obtained.

As shown in FIG. 18C, an EL display device 1175 is formed by a square EL element 1171 and four EL elements 1173 adjacent to the four sides thereof and having a surface area of about 1/4 of the EL element 1171. May be configured. Also in this case, the EL element 1173 is added to the EL element 117.
The same operation and effect can be obtained by applying an AC voltage having a phase opposite to that of 1. In addition, FIG.
(C) indicates that AC voltages having phases inverted to each other are applied.

Next, in a general EL element, as illustrated in FIG. 19, the sound pressure of noise increases in proportion to the AC voltage. However, the EL element does not emit light until an AC voltage higher than a predetermined light emission start voltage (200 V in the illustrated example) is applied. Therefore, the EL element is in a state where no vibration sound is generated and no light is emitted (that is, a state of AC voltage 0 V) as the applied voltage is increased. State 2: a vibration sound is generated but no light is emitted. : Takes three states: a state where a vibration sound is generated and a light is emitted. Here, assuming that a rectangular AC waveform (tentatively referred to as a normal waveform) as an AC voltage waveform and a reversed waveform whose phase is reversed are used as the normal waveform, the driving state of the EL element is changed. The driving state can be classified as shown in Table 1.

[0069]

[Table 1]

Since the AC voltage is 0 V in state 1, no distinction is made between the normal waveform and the reverse waveform. Next, an embodiment of the present invention using the above five driving states will be described. Figure 20 is a block diagram showing an EL display device 1201 of the first actual施例which the present invention is applied to a well known 7-segment display. An EL display 1203 as a 7-segment display includes three horizontally arranged transparent electrodes (from above) 1203a, 1203b, 1203c, and four vertically arranged transparent electrodes 1203d, 1203.
e, 1203f, 1203g (upper left, upper right, lower left, lower right) in order.
g is laminated with a back electrode (not shown) connected to the ground electrode 1205 with the EL light emitting layer interposed therebetween.

Further, each of the transparent electrodes 1203a to 1203g
Are connected to voltage application circuits 1211a to 1211g, and the voltage application circuits 1211a to 1211g
Each type of AC voltage is applied. The control circuit 12
Reference numeral 13 denotes a ROM 1213a in which characters displayed on the EL display 1203 and drive signals input to the voltage application circuits 1211a to 1211g are stored in association with each other, and C (not shown)
It is a known microcomputer having a PU and a RAM. Next, the configuration of the voltage application circuit 1211 (a to g) is shown in FIG.
1 will be described with reference to the circuit diagram of FIG. Voltage application circuit 1211
Now, the input terminals N11, N12, N13 and the output terminal S1
1 is connected to a circuit 1231 configured similarly to the voltage application circuit 31 in FIG. Further, the output terminal S11
Is connected to the drain electrode of the FET 1235 via the diode 1233 and to the FET 123 via the diode 1237.
9 are respectively connected to the drain electrodes. The diode 1233 is connected from the output terminal S11 to the FET 1235.
To the diode, and the diode 1237 is connected to the FET 123
The polarity is determined in such a direction as to interrupt the current from 9 to the output terminal S11. The source electrode of the FET 1235 is connected to the high-voltage electrode H4, and the source electrode of the FET 1239 is connected to the low-voltage electrode L4.

Further, an input terminal N14 is connected to the gate electrode of the FET 1235 via an inverter 1241 and a capacitor 1243 for blocking a DC component.
9, the input terminal N15 is connected to the driver 124
5, are connected via a DC component blocking capacitor 1247. Note that the gate potential of the FET 1235 is Low.
A so-called p-type channel FET that turns on when the level is high
The FET 1239 is a so-called n-channel FET that turns on when the gate potential is at the high level. Also F
Each gate between the gate and the source of ET1235, 1239
Zener diode 1251,1 for protecting ET
253 are connected.

The high potential VH4 of the high-voltage electrode H4 and the low potential VL4 of the low-voltage electrode L4 are respectively high potential VH
1 and approximately half the low-voltage potential VL1, and E
The absolute value is set to be smaller than the light emission start voltage Vth of the L display 1203.

The voltage application circuit 121 thus configured
1 operates as follows. That is, the input terminals N14, N
Drive signal (inputs 14 and 15) to Lo
If it is set to the w level, the output terminal S11 is insulated from the high voltage electrode H4 and the low voltage electrode L4. At this time, the input terminal N11
To N13 (inputs 11, 12, and 13) are shown in FIG.
, The drive signal (output 11) output from the output terminal S11 becomes a rectangular wave alternating voltage that repeats the high potential VH1 and the low potential VL1 at predetermined intervals, as in the case of the output 1. (Drive state). If the input 11 and the input 13 are exchanged, the phase of the output 11 is reversed (driving state).

Also, the inputs 11 and 13 are set to the low level,
If the inputs 14, 12, and 15 are the same as the inputs 1, 2, and 3 in FIG. 3, as shown in FIG. 22, the output 11 is a rectangular wave alternating current that alternates between a high potential VH4 and a low potential VL4 at predetermined intervals. Voltage (drive state). If the input 14 and the input 15 are exchanged, the phase of the output 11 is reversed (driving state). Further, if the input 12 is set to the high level and the other inputs 11 to 15 are set to the low level, the output 11 becomes 0 V (drive state) as shown between the points B and C in FIG.

The EL display device 120 thus configured
In 1, the noise can be suppressed while displaying characters, for example, as follows. FIG. 23A shows the EL display 12.
FIG. 11 is an explanatory diagram illustrating a driving state of each segment when a numeral “5” is displayed in 03. As shown in FIG.
Segments composed of 203a to 1203c are driven
, Transparency electrode 1203d, segments 1203f are the driving state, and light emission, respectively. The segments of the transparent electrodes 1203e and 1203f are driven and do not emit light. Therefore, the number "5" is displayed on the EL display 1203.

On the other hand, from the segments of the transparent electrodes 1203a to 1203c, noise based on the normal waveform is generated.
From the segments 203d to 1203g, noise having a phase opposite to that of the segments is generated. Here, the sound pressure of the noise based on the driving state is substantially half of the sound pressure of the noise based on the driving state. For this reason, the sound pressure of the noise based on the normal waveform and the sound pressure of the noise based on the inverted waveform are substantially equal to each other and favorably interfere with each other. For this reason, generation of noise can be favorably suppressed.

Next, FIG. 23B shows an EL display 1203.
FIG. 7 is an explanatory diagram showing a driving state of each segment when the number “0” is displayed in FIG. Transparent electrodes 1203a, 1203
e, segment 1203f is in the driving state, transparent electrode 1
The segments 203c, 1203d, and 1203g are driven and emit light, respectively. Transparent electrode 1
The segment 203b is in the driving state, and emits neither light nor noise.

The transparent electrodes 1203a, 1203e, 120
The noise generated by the 3f segment and the transparent electrode 1203
The noises generated by the segments c, 1203d, and 1203g are opposite in phase to each other and have the same sound pressure.
Generation of noise can be prevented well. Further, in the present embodiment, noise can be similarly prevented for the other numbers by combining the driving states (1) and (2). It should be noted that there are various ways of combining the driving state and the same even with the same numeral.

The present invention can also be applied to a so-called dot matrix in which a large number of EL elements are arranged in a matrix and each picture element is scanned by column or row to display an image. FIG. 24 is a plan view showing an EL display device 1303 according to the second embodiment in which EL elements 1301 are arranged in a matrix of 4 rows and 5 columns. In this embodiment, a pair of upper and lower EL elements 1301 arranged in the first row, the second row or the third row and the fourth row in the same column form a block 1305. Then, a voltage application circuit (not shown) controls the EL element 1301 of each block 1305 to the driving state illustrated in FIG.

That is, when both the upper and lower EL elements 1301 of the block 1305 emit light, the upper EL element 1301 is driven and the lower EL element 1301 is driven. The upper EL element 1301 emits light and the lower EL element 130 emits light.
When 1 does not emit light, the upper EL element 1301 is driven and the lower EL element 1301 is driven. When the upper EL element 1301 does not emit light and the lower EL element 1301 emits light, the upper EL element 1301 is driven,
The lower EL element 1301 is driven. Upper and lower EL
If both elements do not emit light, the upper and lower EL elements 1301
Are both driven. However, in this embodiment, every row,
Alternatively, scanning is performed every two rows.

In this way, in any of the blocks 1305, the noise generated by the pair of upper and lower EL elements 1301 has phases inverted from each other, so that the noise generated by the EL display device 1303 can be prevented well. When a plurality of EL elements are adjacent to each other as in the EL display devices 601 to 1301 of the sixth to eleventh reference examples and the first and second embodiments, the size of the device with respect to the pixel area of the EL display devices 601 to 1301 Is not different from a conventional device in which a pixel is constituted by one EL element. In each of the above embodiments,
Connected to the voltage application circuit 1211 and the EL element 1301
A voltage application circuit (not shown) is used for the voltage application
1, Vth becomes the second voltage, VH1 and VL1 become
VH4 and VL4 are the second drive voltages in the first drive voltage
Respectively. Also, VH1 is a first drive voltage.
In this case, VL1 corresponds to the third drive voltage.

In each of the above embodiments, an AC voltage having a phase opposite to that of the other half is applied to half of the EL elements. However, simply changing the phase of the AC voltage applied to each EL element is different. Since vibrations interfere with each other, noise can be suppressed. For example, if three EL elements are installed side by side and a sinusoidal AC voltage with a phase difference of 120 ° is applied to each EL element, the vibrations generated by the three EL elements will interfere well and prevent noise. can do.

Further, in each of the above-described embodiments, an AC voltage having a phase different from that of the remaining half is applied to half of the EL elements. Alternatively, an AC voltage having a different phase may be applied. In this case, too, there is a slight noise suppression effect.

[0085]

As described above in detail, in the present invention, the AC voltage applied between the electrodes of one EL element has a different phase from the AC voltage applied to at least one other EL element. The phase of the vibration generated by the element is also different. Further, since the EL light emitting layers of both EL elements are disposed in parallel, the vibrations of both EL elements interfere with each other, and as a result, the vibration of the entire EL display device is reduced. Therefore, the EL display device of the present invention can effectively prevent noise.

Also, in the present invention, even when a plurality of EL elements are provided side by side, the device is not so large because the EL elements are usually in the form of thin films.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an EL display device according to a first reference example.

FIG. 2 is an electric circuit diagram illustrating a voltage application circuit according to a first reference example.

FIG. 3 is a time chart illustrating input / output waveforms of a voltage application circuit according to a first reference example.

FIG. 4 is a time chart showing a sound pressure generated by the EL light emitting element of the first reference example.

FIG. 5 is a cross-sectional view illustrating an EL display device according to a second reference example.

FIG. 6 is an electric circuit diagram illustrating a voltage application circuit according to a second reference example.

FIG. 7 is a time chart illustrating input / output waveforms of a voltage application circuit according to a second reference example.

FIG. 8 is a cross-sectional view illustrating an EL display device according to a third reference example.

FIG. 9 is a cross-sectional view illustrating an EL display device according to a fourth reference example.

FIG. 10 is a cross-sectional view illustrating an EL display device according to a fifth reference example.

FIG. 11 is a cross-sectional view illustrating an EL display device according to a sixth reference example.

FIG. 12 is an electric circuit diagram illustrating a voltage application circuit according to a seventh reference example.

FIG. 13 is a time chart illustrating input and output waveforms of a voltage application circuit according to a seventh reference example.

FIG. 14 is a cross-sectional view illustrating an EL display device according to an eighth reference example.

FIG. 15 is a cross-sectional view illustrating an EL display device according to a ninth reference example.

FIG. 16 is a cross-sectional view illustrating an EL display device according to a tenth reference example.

FIG. 17 is a cross-sectional view illustrating an EL display device according to an eleventh reference example.

FIG. 18 is a plan view illustrating another embodiment of an EL element arranging method.

FIG. 19 is an explanatory diagram illustrating a relationship between an AC voltage and a sound pressure of an EL element.

FIG. 20 is a block diagram illustrating a configuration of an EL display device of the first real施例.

Figure 21 is an electrical circuit diagram showing a configuration of voltage application circuit of the first real施例.

FIG. 22 is a time chart showing input and output waveforms of the voltage application circuit of the first real施例.

FIG. 23 is an explanatory diagram showing a driving state of the EL display device of the first real施例.

FIG. 24 is a plan view illustrating an EL display device according to a second embodiment.

FIG. 25 is an explanatory diagram illustrating a driving state of the EL element of the second embodiment.

Continuation of front page (56) References JP-A-3-250580 (JP, A) JP-A-2-68888 (JP, A) JP-A-61-142690 (JP, A) JP-A-64-61783 (JP) , A) JP-A-61-284951 (JP, A) JP-A-1-150400 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H05B 33/08

Claims (8)

(57) [Claims] 1. An EL display device comprising: an EL element formed by forming a pair of electrodes on both surfaces of an EL light emitting layer, wherein the EL light emitting layer emits light by applying an AC voltage between the pair of electrodes. A plurality of the EL elements are juxtaposed with the light emitting layer being parallel, and a voltage application is performed between the pair of electrodes of one EL element, and an AC voltage having a phase different from that of at least one other EL element is individually applied. Means , wherein the voltage applying means is an electrode of at least one EL element.
An AC voltage lower than the light emission start voltage of the EL element
An EL display device characterized by being made possible. 2. A pair of electrodes is formed on both surfaces of an EL light emitting layer.
And an AC voltage applied between the pair of electrodes.
EL display in which the above EL light emitting layer emits light when added
In the device, a plurality of the EL elements are juxtaposed with the EL light emitting layers being parallel.
And a plurality of EL elements, a first voltage between the pair of electrodes.
Vibrates when a voltage with a larger absolute value is applied
And an absolute value equal to or higher than a second voltage higher than the first voltage.
Having the property of emitting light when the applied voltage is applied
Wherein, of the plurality of EL elements, one of the EL elements
AC having an absolute value greater than or equal to the second voltage between the pair of electrodes
At the same time as applying the first drive voltage as a voltage,
Of the plurality of EL elements, one of the other EL elements
The second voltage which is larger than the first voltage between the pair of electrodes.
The first drive voltage having a smaller absolute value and
Applies the second drive voltage as an AC voltage with a different phase
EL which a voltage applying means for, and characterized by including
Display device. 3. A pair of electrodes is formed on both surfaces of an EL light emitting layer.
And an AC voltage applied between the pair of electrodes.
EL display in which the above EL light emitting layer emits light when added
In the device, a plurality of the EL elements are juxtaposed with the EL light emitting layers being parallel.
In addition, the plurality of EL elements emit predetermined light between the pair of electrodes.
When a voltage having an absolute value equal to or greater than the start voltage is applied,
And emits light at the same time.
When only the applied voltage is applied, only vibration
Out of the plurality of EL elements,
An electrode having an absolute value equal to or higher than the above-mentioned light emission starting voltage between a pair of electrodes.
At the same time as applying the first drive voltage as the
Of the plurality of EL elements, the other one of the above EL elements
The other EL element is turned off between the pair of electrodes.
Has an absolute value smaller than the emission start voltage
And an AC voltage having a phase different from that of the first drive voltage.
And the other one of the other EL elements is applied.
Absolute value equal to or higher than the above-mentioned light emission starting voltage if
Having a phase different from that of the first drive voltage.
Voltage applying means for applying a third driving voltage as a flowing voltage
An EL display device comprising: 4. The first drive voltage and the second drive voltage.
The dynamic voltages have different polarities and at approximately the same timing.
4. The method according to claim 2, wherein the voltage is applied.
L display device. 5. The one of the plurality of EL elements,
The L element and the other EL element are adjacent on the same plane.
The pair of EL elements provided in contact with each other and in the adjacent state form a common electrode shared by both EL elements, a pair of EL light emitting layers stacked on the surface of the common electrode,
And a pair of individual electrodes laminated on the L light emitting layer, respectively , wherein the first drive voltage and the second drive voltage
The pressure is one of the pair of individual electrodes and the common electrode.
And the other of the pair of individual electrodes and the
The EL display device according to any one of claims 2 to 4 , wherein the voltage is applied between the electrode and the through electrode . 6. The plurality of EL elements form a matrix.
And the voltage application means includes a plurality of E
The one EL element and the other EL element among the L elements
While simultaneously scanning the element and the first driving voltage,
The second drive voltage is applied.
5. The EL display device according to 5 . 7. The method according to claim 7, wherein the voltage is applied by the voltage applying means.
The first drive voltage and the second drive voltage are rectangular wave-shaped.
7. The method according to claim 2, wherein the voltage is an AC voltage.
An EL display device according to any of the above. 8. The one of the plurality of EL elements,
The L element and the other EL element are adjacent to each other on the same plane.
Claim 1, characterized in that it has features by contacting
8. The EL display device according to any one of items 1 to 7.