JPH10214060A - Electric field light emission display device and its driving method - Google Patents

Electric field light emission display device and its driving method

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Publication number
JPH10214060A
JPH10214060A JP9027323A JP2732397A JPH10214060A JP H10214060 A JPH10214060 A JP H10214060A JP 9027323 A JP9027323 A JP 9027323A JP 2732397 A JP2732397 A JP 2732397A JP H10214060 A JPH10214060 A JP H10214060A
Authority
JP
Japan
Prior art keywords
voltage
electroluminescent
display device
driving
period
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
JP9027323A
Other languages
Japanese (ja)
Inventor
Masaharu Shiotani
Hiroyasu Yamada
雅治 塩谷
裕康 山田
Original Assignee
Casio Comput Co Ltd
カシオ計算機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Casio Comput Co Ltd, カシオ計算機株式会社 filed Critical Casio Comput Co Ltd
Priority to JP9027323A priority Critical patent/JPH10214060A/en
Priority claimed from TW87101059A external-priority patent/TW441136B/en
Publication of JPH10214060A publication Critical patent/JPH10214060A/en
Abandoned legal-status Critical Current

Links

Abstract

(57) [Problem] To provide a driving method of an electroluminescent display device which can perform gradation control with good controllability and can operate with low power consumption. SOLUTION: One frame period of an electroluminescent display device in which electroluminescent elements are arranged in a matrix and a selection transistor and a driving transistor of the electroluminescent element are connected is divided into eight subframes. These subframes have different display discharge times T in each subframe.
on, and the same address period Ta in all subframes.
dd). For this reason, 8
In each of the three sub-frames, the total light emission time of each pixel can be made different depending on whether a pixel is selected or not, and gradation expression is possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an electroluminescent display device and a method of driving the same, and more particularly, to a method of driving a display device which emits electroluminescence.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
There is an organic EL display (electroluminescent display) having a structure including two thin film transistors (hereinafter, referred to as TFTs). In this organic EL display, as shown in the figure, the channel resistance of the driving TFT 2 connected in series with the organic EL element 1 is displayed in gradation by writing the gate bias of the driving TFT 2 by the selection TFT 3. Here, select TF
When T3 is selected on the scanning line Xm, a write signal is supplied from the signal line Yn. FIG.
1 is a graph showing the relationship between the gate voltage (Vg) and the channel resistance of the driving TFT 2 written in this way, that is, the static characteristics of a so-called field effect transistor (FET). FIG. 12 is an equivalent circuit diagram showing the relationship among the organic EL element 1, the voltage control means Vc, and the common EL power supply 4 for all pixels in one pixel. The voltage control means Vc is connected to the selection transistor 3
And the driving transistor 2.

[0003]

In the above-described conventional organic EL display having a one-pixel two-cell TFT structure, the driving T
By changing the current flowing through the channel by changing the gate bias of the FT2, the gray scale is expressed by changing the light emission luminance of the pixel EL. Therefore, in order to realize, for example, 256 gradations, the characteristic variation in the linear region of the driving TFT 2 of each pixel in the panel must be within the range required for controlling the 256 gradations. There is a problem that it is difficult to manufacture a TFT panel having excellent characteristics.

The problem to be solved by the present invention is that what means should be taken to obtain a driving method of an electroluminescent display device which can perform gradation display with good controllability and can operate with low power consumption. It is in the point.

[0005]

According to the first aspect of the present invention,
An electroluminescent display device, each including a pair of electrodes, a plurality of electroluminescent elements that emit light in response to application of a voltage, and each of the electroluminescent elements is connected to one of the pair of electrodes. A plurality of first switching circuits that output one of a ground voltage and a drive voltage having a constant voltage value to an electroluminescent element to emit light in each light emission setting period corresponding to each address period during the address period; A second electrode that is connected to the other of the pair of electrodes of each of the electroluminescent elements and outputs the other of the ground voltage or the drive voltage to the all electroluminescent elements during each of the emission setting periods.
And a switching circuit.

According to the first aspect of the present invention, an electroluminescent element to emit light in each light emission setting period is selected in advance, and one of a ground voltage and a driving voltage having a constant voltage value is applied to each corresponding address period. Therefore, by applying the other of the ground voltage or the driving voltage to the other of the pair of electrodes of all the electroluminescent elements in each light emission setting period, only the selected electroluminescent element can emit light in each light emission setting period. Therefore, by selectively emitting light from the electroluminescent elements during the plurality of emission setting periods, in other words, controlling the apparent emission luminance of each electroluminescent element according to the total time of the selected emission setting period. be able to.

According to a second aspect of the present invention, the electroluminescent elements are arranged in a matrix, and one frame period is a plurality of address periods and time periods respectively corresponding to the address periods and having different lengths. And a plurality of light emission setting periods. According to the second aspect of the present invention, since the time lengths of the light emission setting periods are different from each other, if the light emission setting period according to the gradation is selected, each pixel has one pixel regardless of the driving voltage having a constant voltage value. Light emission of a large number of luminance gradations can be realized with a small number of selections in a frame period.

According to a third aspect of the present invention, in the first switching circuit, the selection transistor has a gate electrode connected to a scanning line to which a scanning voltage is supplied and a drain electrode connected to a signal line to which a signal voltage is supplied. A gate electrode is connected to a source electrode of the select transistor,
And a drive transistor connected to a drive power supply having a drain electrode connected to the electroluminescent element and a source electrode grounded or outputting one of the drive voltages. According to the third aspect of the present invention, it is possible to charge the electroluminescent element selected during the address period so that one of the ground voltage and the driving voltage having a constant voltage value can be easily applied during the light emission setting period.

The invention according to claim 4 is characterized in that the scanning voltage and the signal voltage are ON / OFF binary signals corresponding to respective characteristics. The invention according to claim 5 is characterized in that an on / off binary signal is input to the second switching circuit.

[0010] In the invention according to claims 4 and 5,
Since the scanning voltage, the signal voltage, and the second switching circuit can be controlled by a binary signal of ON / OFF, the selection transistor, the driving transistor, and the VI of the second switching circuit can be controlled.
Even if there is some variation in the characteristics, the luminance gradation can be favorably controlled by applying a voltage in the saturation current region.

The invention according to claim 6 is characterized in that the ratio of the length of each of the light emission setting periods is any of 2 to the power of n (n is an integer of 0 or more).

According to a seventh aspect of the present invention, in the driving method of the electroluminescent display device having a plurality of electroluminescent elements which emit light in response to the application of a voltage, each of the electroluminescent elements is selected arbitrarily in one frame period. A plurality of address periods, and after each of the address periods, supplying a drive voltage to the electroluminescent element selected in the address period. It is characterized by having.

According to the present invention, in each address period, an electroluminescent element that should emit light in the next drive voltage supply period is selected in advance and emits light in the drive voltage supply period. Since the lengths of time are different from each other, if each pixel selects a drive voltage supply period according to the gray scale, a large number of luminance gray scales can be selected with less selection in one frame period despite the drive voltage having a constant voltage value. A number of emissions can be realized.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a method for driving an electroluminescent display device according to the present invention will be described below based on embodiments shown in the drawings. Prior to the description of the driving method, the structure of the electroluminescent display device will be described. FIG. 1 is a drive circuit diagram of the electroluminescent display device according to the present embodiment. As shown in the figure, an organic EL element 101 as an electroluminescent element
Are formed in respective pixel regions arranged in an XY matrix. These pixel regions are formed at portions where a plurality of scanning lines X and a plurality of signal lines Y intersect, respectively. One pixel region includes a selection transistor Q connected to a scanning line X and a signal line Y.
1, a driving transistor Q 2 to which the gate is connected is provided on the select transistor Q 1. This drive transistor Q 2 is connected to one electrode of the organic EL element 101. The selection transistor Q 1 is selected, and the driving transistor Q 2 and the drive signal is outputted from the signal line Y is set to be turned on. This drive signal is a binary signal of ON / OFF.
It should be noted that the drive transistor Q 2 is an organic EL in the off state.
The resistance is sufficiently higher than that of the element 101, and the organic E
The characteristics are set such that the resistance is sufficiently low that it can be ignored as compared with the L element 101.

FIG. 2 is an equivalent circuit diagram of one pixel portion of the electroluminescent display device. Switch S 1 shown in the figure is connected to one electrode of the organic EL element 101, in the closed state of the switch S 1, it is possible to light emission of the organic EL element 101. The switch S 2 is connected to the other electrode side of the organic EL element 101, along with commonly used in all the pixels may be simultaneously turned on / off all the pixels in accordance with light emitting times in the subframe period to be described later It has become. In FIG. 2, Ps indicates a drive power supply fixed to a constant voltage.

Here, a more specific structure of the electroluminescent display device according to the present embodiment will be described with reference to FIGS. FIG. 3 is a plan view illustrating one pixel portion of the electroluminescent display device according to the present embodiment. FIG. 4 is a cross-sectional view of FIG.
It is A sectional drawing. In the figure, reference numeral 100 denotes a light emitting display.

The light emitting display device 100 of the present embodiment is
A plurality of scanning lines 103, which are formed by patterning a gate metal film made of, for example, aluminum (Al) on a substrate 102 made of glass or a resin film, and are parallel and equally spaced along a predetermined direction (X direction). the scan line 103 that integrally includes a gate electrode 103A of the selection transistors Q 1, and the gate electrode 103B of the driving transistor Q 2, is formed. An anodic oxide film 104 is formed on the surfaces of the gate electrodes 103A and 103B and the scanning lines 103. A gate insulating film 105 made of silicon nitride is formed on the scanning lines 103, the gate electrodes 103A and 103B, and the substrate 102. Further, the gate electrode 103
A, Gate insulating films 105A, 105B above 103B
Semiconductor layers 106A and 106B made of amorphous silicon (a-Si) are pattern-formed thereon.
Further, blocking layers 107A and 107B formed along the channel width direction are formed at the centers of the respective semiconductor layers 106A and 106B. Then, on the semiconductor layer 106A, the ohmic layer 108 separated into the source side and the drain side on the blocking layer 107A.
A, 108A are formed. Further, in the select transistor Q 1, the drain side of the ohmic layer 108
A signal line 109A stacked and connected to A and a source electrode 109B stacked and connected to the ohmic layer 108A on the source side are formed. This source electrode 10
9B, as shown in FIG. 3, the gate electrode 103B of the driving transistor Q 2, are connected via a contact hole 110 which is opened in the gate insulating film 105.
In the driving transistor Q 2, the GND line 111 for connecting is laminated on the ohmic layer 108B on the source side,
A drain electrode 112 is formed, one end of which is stacked and connected to the drain-side ohmic layer 108B, and the other end of which is connected to a cathode electrode 114 described later of the organic EL element 101. These select transistors Q 1 and driver transistor Q 2 is, constitutes a switch S 1 shown in FIG.
Further, the gate electrode 103B, the gate insulating film 105, and the GN
The capacitor Cp1 is configured with the D line.

Next, the configuration of the organic EL element 101 will be described. First, an interlayer insulating film 113 is deposited over the entire light emitting display region of the electroluminescent display device 100 on the above-described selection transistor Q 1 , driving transistor Q 2 and gate insulating film 105. Then, a contact hole 113A is formed in the interlayer insulating film 113 on the end of the drain electrode 112 of the driving transistor Q 2 to which the above-mentioned. In the present embodiment, the end portion of the drain electrode 112 of the driving transistor Q 2 is set to be positioned at substantially the center of one pixel region. Then, the interlayer insulating film 113
A cathode electrode 114 made of, for example, MgIn is formed in a rectangular shape over substantially the entire pixel region. That is, the cathode electrode 114 is connected to the adjacent signal line 1.
Scanning lines 103 and 10 adjacent to the scanning lines 09A and 109A.
3 is formed so as to substantially cover a region (one pixel region) surrounded by the reference numeral 3. Therefore, the selection transistor Q 1 and the driving transistor Q 2 are entirely covered with the cathode electrode 114.

Further, as shown in FIG. 4, an organic EL layer 115 is formed over the entire light emitting display area on the cathode electrode 114 and the interlayer insulating film 113 which are patterned for each pixel. . Further, on the organic EL layer 115, an anode electrode 116 made of transparent ITO is formed over the entire light emitting display region of the entire organic EL element 101. Also, the anode electrode 1 of each organic EL element 101
Reference numeral 16 is connected to a drive power supply Ps for supplying a drive voltage Vdd via a switch S2.

Here, the operation of the electroluminescent display device 100 having the above configuration will be described. In the present embodiment, the cathode electrode 114 is connected to the adjacent signal line 10.
Scan lines 103 and 103 adjacent to 9A and 109A
The organic EL element 101 can emit light over substantially the entire area of one pixel region because the organic EL element 101 is formed so as to substantially cover the region (one pixel region) surrounded by. Further, since the cathode electrode 114 is made of MgIn having light reflectivity, when a driving voltage is applied between the cathode electrode 114 and the anode electrode 116, display light generated in the organic EL layer 115 is: The light is emitted toward the anode electrode 116 without leaking downward (to the glass substrate 102). Therefore, it is possible to avoid the semiconductor layer 106A of the selection transistors Q 1 and driver transistor Q 2, can unnecessarily light to 106B is prevented from entering, from malfunction due to the photovoltaic of each transistor is generated . In addition, since the display light is emitted from the transparent anode electrode 116 side, the display light is emitted with high brightness without being absorbed by the glass substrate 102 or the like.

Next, the electroluminescent display device 10 of the present embodiment will be described.
A drive circuit system of 0 will be described. As shown in an equivalent circuit diagram of FIG. 2, EL display circuit of a pixel portion of an organic EL element 101 and the switch S 1, S 2 and the drive power Ps is configured. Further, as described above, the switch S 1 includes the selection transistor Q 1 and the driving transistor Q 2, and can selectively supply (output) the ground potential to the organic EL element 101. In the organic EL element 101, the driving power Ps for supplying a driving voltage Vdd constant voltage value of the positive polarity is connected to the anode electrode side, the switch S 1 is connected to the cathode electrode side, constituting the switch S 1 driving the source electrode of the transistor Q 2 is grounded through a GND line 111.

Hereinafter, the electroluminescent display device 10 of the present embodiment will be described.
The method of driving 0 will be described. First, in the present embodiment,
In the electroluminescent display device 100, the number of the scanning lines 103 is set to, for example, 480, and the number of the signal lines 109A is set to, for example, 640. In the present embodiment, FIG.
The gradation display method shown in FIG. As shown in the figure, one frame period (a period for drawing one display) is 16.
One frame period is divided into eight subframe periods (subframes 1 to 8), assuming that the period is fixed to 6 ms. Each sub-frame period includes an address period Tadd for performing address writing and drive voltage supply periods Ton1 to Ton8 corresponding to the address period. This drive voltage supply period T
Assuming that Ton1 is 1 (= 2 0 ), the ratio of on is To
n2 is 2 (= 2 1 ), Ton3 is 4 (= 2 2 ), Ton4
Is 8 (= 2 3 ), Ton 5 is 16 (= 2 4 ), Ton 6 is 32 (= 2 5 ), Ton 7 is 64 (= 2 6 ), and Ton 8 is 128 (= 2 7 ). If a luminance of 1 is displayed in one drive voltage supply period in such a drive voltage supply period, only one sub-frame 1 is turned on to display 1 luminance.
Is obtained. When the brightness is 2, only the subframe 2 is used. When the brightness is 3, the subframe 1 and the subframe 2 are used.
, When the number is 4, only the sub-frame 3 is lit, and so on in the same manner as described above, for a total of 256 (=
It is possible to display the gray scale of 2 8).

In each sub-frame, after the address writing is completed in the address period Tadd, the pixels whose addresses are selected during the drive voltage supply period Ton are simultaneously turned on. In the next subframe, the address period Tadd
During address rewriting, the drive voltage supply period Ton
At the same time, the pixels whose addresses have been selected are turned on. As described above, the processing from subframe 1 to subframe 8 is performed within one frame period. Timing of address selection, controlled by switch S 1 shown in FIG. 2, the drive voltage supply time can be controlled by the on-time of the switch S 2. That is,
Within one sub-frame period, the selection transistor Q 1 of a pixel to be turned on during a display discharge period unique to this sub-frame by line-sequential scanning of the scanning line and the signal line.
Is turned on. The state selection transistor Q 1 is from the consisting the signal lines on via the selection transistor Q 1 is performed writing to the gate electrode of the driving transistor Q2, the channel drive transistor Q 2 is in the address period Tadd is formed Is held. After all the pixels to be lit during this address period are selected,
That is, the selected state is maintained until the drive voltage supply period Ton after the end of the address period Tadd. During the drive voltage supply period Ton, connected driving power Ps is turned on by the switch S 2 to the anode electrode 116. The length of the drive voltage supply period is set in each subframe as described above. Here, when the time length of the entire address period Tadd in one frame period is equal to the time length of the drive voltage supply periods Ton1 to Ton8, each address period Tadd becomes about 1.04 ms, and each scan line X 1 time selected by the first driving voltage supply period to X 480 becomes about 2.2 microseconds.

Next, the principle of performing gray scale display by the driving method of this embodiment will be described with reference to FIG. This diagram shows an example in which one frame period is divided into three subframes for simplification. The driving voltage supply period (light emission time) of subframe 1 is 1 (= 2 0 ), and the driving of subframe 2 is performed. The voltage supply period was 2 (= 2 1 ), and the drive voltage supply period of subframe 3 was 4 (= 2 2 ). FIG. 6 shows the pixels 13, 22, 24, 31, 35, and 4 in the hatched portions of the mesh.
An example is shown in which the luminances of 2, 44, and 53 are displayed so as to increase. Specifically, assuming that all the pixels are selected in subframe 1 and light emission of luminance 1 is performed, in subframes 2 and 3, pixels 13, 22, 24, 3
Only 1, 35, 42, 44, and 53 are selected, and it is set that luminance 2 and luminance 4 have been added. Therefore, in a state where three sub-frames have been completed (one frame period has been completed), the pixels 13, 22, 24, 31, 35, 42, 4
4 and 53 have a luminance of 7 and are higher in luminance than other pixels having a luminance of 1. As described above, by dividing one frame period into a plurality of subframes, the ratio between the total address period and the total drive voltage supply period can be changed, so that the gray scale display of the electroluminescent display device 100 becomes possible. . In addition, if the most efficient voltage value in the voltage-luminance-efficiency characteristics of the organic EL element shown in FIG. 7 is set for light emission driving, light emission driving can be performed with low power consumption. Such a principle can be similarly applied to a case where one frame period is divided into eight sub-frames, and 256 gradations can be expressed.

[0025] As described above, according to this embodiment, using a switch S 2 to control a binary signal on / off switching of the constant drive voltage Vdd, and a selection transistor Q 1 to the driving transistor Q 2 Also, since either one of the binary signals of ON / OFF is selectively output, the source-drain voltage VSD in FIG. 10 is set to a range where the source-drain current becomes a saturation current. Even if the VI characteristics vary slightly between 1 V and 5 V, it is possible to control the luminance gradation satisfactorily and perform stable gradation control. In particular, when three switching elements, ie, the selection transistor Q 1 , the driving transistor Q 2 , and the switch S 2 , are configured for one organic EL element, slight differences in their electrical characteristics are synergistic, and one pixel is formed. for larger there is a risk that will offset the luminance gradation as, select transistors Q 1 and driver transistor Q 2 and the switch S 2 is that only performs on / off control using a voltage value in the saturation current region, There is an advantage that even if there is some variation in characteristics, it is hardly affected by the variation. In addition, a voltage value with high luminous efficiency for the organic EL element 101 can be set as a driving voltage, so that low power consumption can be achieved.

Although the present embodiment has been described above, the present invention is not limited to this, and various design changes accompanying the gist of the configuration are possible. For example, in the above embodiment, in order to hold the address selected in the address period in the sub-frame period, a configuration having a selection transistor Q 1, the driving transistor Q 2, 1 pixel equivalent of FIG. 8 The address selection state can be held even with a configuration shown by a circuit. In the figure, Q 3 is a selection transistor, Q 4 is a driving transistor,
Cp2 indicates the capacity. Since the driving transistor Q 4 is separately connected to the capacitor Cp 2, the EEP
A TFT having no ROM function can be used. One of the source and drain of the driving transistor Q 4 is connected to the cathode electrodes of the organic EL element 101, the other is connected to the 'DC power supply Ps supplies' negative potential Vdd via a switch S 2. The organic EL element 101 is an anode electrode formed over the light emitting entire display area is grounded structure, the driving transistor Q 4 is selected to emit light when the switch S 2 is turned on. In the above-described embodiment, the electroluminescent device is particularly effective for the organic EL device 101 that can emit light in a DC electric field. However, an inorganic EL device or another electroluminescent device can of course be applied. In this embodiment, the light emitting layer of the organic EL element may be composed of two or more organic layers having different charge transporting properties,
A sealing layer for preventing entry of oxygen and water may be provided over the anode electrode 116. Further, from the substrate 102 side, the anode electrode 116, the organic EL layer 115, the cathode electrode 114
In this order.

In this embodiment, the length of the entire address period Tadd in one frame period is equal to the length of the drive voltage supply periods Ton1 to Ton8.
Select transistors Q 1 , Q 3 , drive transistors Q 2 , Q 4
According to the above characteristics, one of the address period Tadd and the drive voltage supply period Ton may be lengthened, and the other may be shortened. In addition, the driving voltage supply periods Ton are in the order of shortest (T
on1, Ton2,..., Ton8), but is not limited to this, and is applied in the long order (Ton8, Ton7,.
1) good, or Ton8, Ton1, Ton5,
The order of the time lengths, such as the order of Ton4, Ton7, Ton2, Ton6, and Ton3, does not have to be the same. The drive voltage Vdd supplied by the drive power supply Ps may be an alternating current of a DC voltage. Further, the number of gradations is not limited to 256 gradations, and may be more or less than 256 gradations as long as there are a plurality of gradations.

In the present embodiment, the switch S 1 composed of the selection transistor Q 1 and the drive transistor Q 2 is connected to the GND line 111, and the switch S 2 that turns on during the drive voltage supply period T is connected to the drive power supply Ps. It is, but as shown in FIG. 9, the organic EL anode electrode side of the switch S2 of the element 101 is grounded directly without passing through the driving power Ps, the driving transistor Q 2 switches S 1 of the cathode side of the organic EL element 101 May be connected to a driving power supply Ps ′ that supplies a driving voltage Vdd ′ having a constant value of negative polarity instead of the GND line 111. Even in this case, scan lines X, the signal line Y, and outputs one of the respective binary signal, turning on the switch S 2 which is connected to the anode electrode of the organic EL element 101 in a binary signal, OFF control can do. That is, during the address period Tadd, the drive voltage Vd is applied to the cathode electrode side of the selected organic EL element 101.
d 'is supplied to the drive voltage supply period Ton entire switch S 2 is turned on, the anode electrode of the organic EL element 101 is grounded to emit light.

Further, in this embodiment, the organic EL element 1
01 has been formed over the switch S 1, may be formed on the switch S 1 and the same plane. Note that, in this case, the anode electrode 116, the organic EL layer 115,
If the cathode electrode 114 is formed by laminating in order, the cathode electrode 11 made of a material having a low work function and easily oxidized.
4 is not deteriorated by the process of forming the anode electrode 116 and the organic EL layer 115.

[0030]

As is apparent from the above description, according to the present invention, it is possible to perform gradation display of the electroluminescent display device with good controllability, and to operate at low power consumption.

[Brief description of the drawings]

FIG. 1 is a drive circuit diagram of an electroluminescent display device according to an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram of one pixel portion of the electroluminescent display device according to the embodiment.

FIG. 3 is a plan view of the electroluminescent display device according to the embodiment.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

FIG. 5 is an explanatory diagram illustrating a driving method according to the embodiment.

FIG. 6 is an explanatory diagram illustrating the principle of gray scale display when one frame period is divided into three sub-frames.

FIG. 7 is a graph showing voltage-luminance-efficiency characteristics of the organic EL element according to the embodiment.

FIG. 8 is an equivalent circuit diagram showing one pixel portion of a light emitting display device to which the present invention can be applied.

FIG. 9 is a driving circuit diagram of an electroluminescent display device according to another embodiment of the present invention.

FIG. 10 is an equivalent circuit diagram showing one pixel portion of a conventional electroluminescent display device.

FIG. 11 shows a driving TFT in a conventional electroluminescent display device.
2 is a graph showing the relationship between the gate voltage (Vg) and the channel resistance of FIG.

FIG. 12 is an equivalent circuit diagram showing a relationship among an organic EL element 1, a voltage control means Vc, and an all-pixel common EL power supply 4 in one pixel of a conventional electroluminescent display device.

[Explanation of symbols]

100 light emitting display device 101 organic EL device 103 scanning lines 109A signal lines Q 1 selected transistor Q 2 driving transistor S 2 switch

Claims (12)

[Claims]
1. A plurality of electroluminescent elements each having a pair of electrodes and emitting light in response to application of a voltage, connected to one of the pair of electrodes of each of the electroluminescent elements, and connected to each of the address periods. A plurality of first switching circuits that output one of a ground voltage and a driving voltage having a constant voltage value to an electroluminescent element to emit light in each light emission setting period corresponding to each address period; A second switching circuit that is connected to each of the other of the pair of electrodes of the element and outputs the other of the ground voltage or the drive voltage to the entire electroluminescent element during each of the light emission setting periods. An electroluminescent display device characterized by the above-mentioned.
2. The method according to claim 1, wherein the electroluminescent elements are arranged in a matrix, and one frame period includes the plurality of address periods.
2. The electroluminescent display device according to claim 1, comprising a plurality of light emission setting periods respectively corresponding to each address period and having different lengths.
3. The first switching circuit according to claim 1, wherein the first switching circuit includes a selection transistor having a gate electrode connected to a scan line to which a scan voltage is supplied, and a drain electrode connected to a signal line to which a signal voltage is supplied. A drive transistor connected to a source electrode of the select transistor, a drain electrode connected to the electroluminescent element, and a source electrode connected to a drive power supply that outputs one of the ground and the drive voltage. The electroluminescent display device according to claim 1 or 2, wherein:
4. The electroluminescent display device according to claim 3, wherein the scanning voltage and the signal voltage are ON / OFF binary signals corresponding to respective characteristics.
5. The method according to claim 1, wherein the second switching circuit includes an on / off switch.
2. An off-state binary signal is input.
The electroluminescent display device according to claim 4.
6. The method according to claim 1, wherein a ratio of a length of time of each of the light emission setting periods is any one of 2 n (n is an integer of 0 or more). The electroluminescent display device according to any one of the above.
7. A method for driving an electroluminescent display device having a plurality of electroluminescent elements which emit light in response to application of a voltage, wherein one frame period includes a plurality of address periods for selecting any of the electroluminescent elements. And a driving voltage supply period that is set to a different length of time for supplying a driving voltage to the electroluminescent element selected in the address period after each of the address periods. A method for driving an electroluminescent display device.
8. The plurality of electroluminescent devices each have a pair of electrodes, and one of the pair of electrodes of the plurality of electroluminescent devices is connected to a plurality of first switching circuits respectively corresponding to the plurality of electroluminescent devices, The other of the pair of electrodes of the plurality of electroluminescent elements is respectively connected to a second switching circuit, and the first switching circuit selects the electroluminescent element for each of the address periods and selects a ground voltage or a fixed voltage value. The second switching circuit outputs the ground voltage or the drive voltage to the electroluminescent element selected according to each of the address periods during the drive voltage supply period corresponding to each of the address periods. 8. The method according to claim 7, wherein the other of the voltages is output.
9. The selection transistor, wherein the first switching circuit has a gate electrode connected to a scan line to which a scan voltage is supplied, and a drain electrode connected to a signal line to which a signal voltage is supplied, and a gate electrode, 9. The driving transistor connected to a source electrode of the selection transistor, a drain electrode connected to the electroluminescent element, and a source electrode including a driving transistor for inputting one of the ground voltage or the driving voltage. Driving method of the electroluminescent display device.
10. The electroluminescent display according to claim 9, wherein the scanning voltage, the signal voltage, and the second switching circuit are supplied with on / off binary signals corresponding to respective characteristics. How to drive the device.
11. The device according to claim 7, wherein the electroluminescent elements are arranged in a matrix, and in the one frame period, the address period and the drive voltage supply period are set alternately. A driving method of the electroluminescent display device according to any one of the above.
12. The method according to claim 7, wherein a ratio of a time length of each of the drive voltage supply periods is any of 2 to the n-th power (n is an integer of 0 or more). The driving method of the electroluminescent display device according to any one of the above.
JP9027323A 1997-01-28 1997-01-28 Electric field light emission display device and its driving method Abandoned JPH10214060A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9027323A JPH10214060A (en) 1997-01-28 1997-01-28 Electric field light emission display device and its driving method

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
JP9027323A JPH10214060A (en) 1997-01-28 1997-01-28 Electric field light emission display device and its driving method
TW87101059A TW441136B (en) 1997-01-28 1998-01-26 An electroluminescent display device and a driving method thereof
US09/013,708 US5990629A (en) 1997-01-28 1998-01-26 Electroluminescent display device and a driving method thereof
EP19980900761 EP0906609A1 (en) 1997-01-28 1998-01-27 Active matrix electroluminescent display device and a driving method thereof
CA 2249592 CA2249592C (en) 1997-01-28 1998-01-27 Active matrix electroluminescent display device and a driving method thereof
CNB988000679A CN1151483C (en) 1997-01-28 1998-01-27 Electroluminescent display device and driving method thereof
PCT/JP1998/000327 WO1998033165A1 (en) 1997-01-28 1998-01-27 Active matrix electroluminescent display device and a driving method thereof

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