WO2018168617A1 - Dispositif d'émission de lumière plane - Google Patents

Dispositif d'émission de lumière plane Download PDF

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Publication number
WO2018168617A1
WO2018168617A1 PCT/JP2018/008890 JP2018008890W WO2018168617A1 WO 2018168617 A1 WO2018168617 A1 WO 2018168617A1 JP 2018008890 W JP2018008890 W JP 2018008890W WO 2018168617 A1 WO2018168617 A1 WO 2018168617A1
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Prior art keywords
electrode
organic
electrode layer
layer
detection
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PCT/JP2018/008890
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English (en)
Japanese (ja)
Inventor
正利 米山
司 八木
一由 小俣
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コニカミノルタ株式会社
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Priority to JP2019505928A priority Critical patent/JP6881566B2/ja
Publication of WO2018168617A1 publication Critical patent/WO2018168617A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces

Definitions

  • the present invention relates to a surface light emitting device using an organic EL element.
  • the surface light emitting device is a light emitting device having a function of a surface light source.
  • An organic EL lighting device is known as an example of the surface light emitting device.
  • an organic EL lighting device with a touch detection function. According to this, the user can perform various operations (for example, lighting on / off operation) by touching the lighting panel.
  • an organic electroluminescence module disclosed in Patent Document 1.
  • This has a capacitance type touch detection circuit unit and a light emitting element driving circuit unit having a light emitting element driving circuit unit for driving the organic electroluminescence panel, and the organic electroluminescence panel is located at an opposing position inside.
  • the pair of electrodes are connected to the light emitting element driving circuit unit, and one of the pair of electrodes is a touch detection electrode, and the touch detection electrode is the touch Connected to the detection circuit unit.
  • one of a pair of planar electrodes constituting an organic electroluminescence panel is used as a touch detection electrode (hereinafter, detection electrode).
  • detection electrode a touch detection electrode
  • Patent Document 1 is an organic EL lighting device of a type constituted by an organic EL element having a structure in which an electrode layer, an organic layer, and an electrode layer are laminated.
  • an organic EL element having a structure in which an electrode layer, an organic layer, and an electrode layer are laminated.
  • the present inventor has an excessively large current (current used for touch detection) supplied to the detection electrode by the touch sensor. Found that it can not be used.
  • the current used for touch detection is, for example, about several mA.
  • An object of the present invention is to provide a surface light emitting device that has a structure in which a plurality of organic EL elements are stacked and a touch detection function, and can perform touch detection without excessively increasing the current used for touch detection.
  • the plurality of organic EL elements are composed of a plurality of electrode layers and a plurality of organic layers in which electrode layers and organic layers are alternately stacked on the opposite side of the touch surface of the transparent substrate. Are connected in series.
  • the touch sensor detects a change in capacitance by using any one of the plurality of electrode layers as a detection electrode.
  • the first control unit controls each electrode layer other than the electrode layer used as the detection electrode among the plurality of electrode layers to the same potential as the detection electrode during the detection period by the touch sensor.
  • 1 is a cross-sectional structure diagram of a surface light emitting device according to a first embodiment. It is a circuit block diagram of the surface emitting device which concerns on 1st Embodiment. It is a wave form diagram which shows the waveform of the voltage applied to each electrode layer during the detection period of the surface emitting device which concerns on 1st Embodiment. It is explanatory drawing explaining the state of each electrode layer in a detection period in each of 1st Embodiment, the modification 1, the modification 2, and the modification 3. FIG. It is explanatory drawing explaining each period which generate
  • an electrode layer 3-1, an organic layer 4-1, an electrode layer 3-2, an organic layer 4-2, and an electrode layer 3-3 are laminated in this order.
  • the electrode layer 3-1, the organic layer 4-1, and the electrode layer 3-2 constitute an organic EL element 5-1.
  • the electrode layer 3-2, the organic layer 4-2, and the electrode layer 3-3 constitute an organic EL element 5-2. Accordingly, the organic EL element 5-1 and the organic EL element 5-2 are laminated on one surface 2a of the transparent substrate 2, and these are connected in series.
  • FIG. 17 is a circuit configuration diagram of a surface light emitting device according to a comparative example.
  • the organic EL element 5-1 and the organic EL element 5-2 are connected in series.
  • C1 is a parasitic capacitance of the organic EL element 5-1.
  • C2 is a parasitic capacitance of the organic EL element 5-2.
  • the surface light emitting device includes a touch sensor 10.
  • the touch sensor 10 includes a detection circuit 8 connected to the electrode layer 3-1. In the detection period in which the touch sensor 10 detects a touch, the electrode layer 3-1 is used as a detection electrode.
  • the touch surface with which the finger F touches is the other surface 2b of the transparent substrate 2.
  • Cf is a capacitance generated when the finger F approaches or contacts the transparent substrate 2.
  • FIG. 18 is a waveform diagram showing waveforms of voltages applied to the electrode layers 3 during the detection period of the surface light emitting device according to the comparative example.
  • a waveform W1 is a waveform of a voltage applied to the anode (electrode layer 3-1) of the organic EL element 5-1.
  • the anode (electrode layer 3-1) of the organic EL element 5-1 is used as a detection electrode.
  • the waveform W1 is generated by the pulse output from the detection circuit 8. When the pulse is at the H level, a charging current flows through the capacitance Cf, and the detection circuit 8 detects a change in the capacitance Cf based on this charging current.
  • the frequency of the pulse is usually a few megahertz.
  • the capacitance Cf is usually several pF.
  • the parasitic capacitances C1 and C2 are about 1 ⁇ F when they are large.
  • the parasitic capacitance C1 is connected to the electrostatic capacitance Cf. For this reason, when a charging current flows through the parasitic capacitance C1, the charging current supplied to the detection circuit 8 becomes too small, and the detection circuit 8 cannot measure the charging current. Therefore, in the technique of Patent Document 1, the anode (electrode layer 3-1) of the organic EL element 5-1 and the cathode (electrode layer 3-2) of the organic EL element 5-1 are controlled to have the same potential, and the parasitic capacitance is controlled. The discharge current is prevented from flowing through C1 (Note that the organic electroluminescence module disclosed in Patent Document 1 does not include the organic EL element 5-2). When the technique of Patent Document 1 is applied to a comparative example, the following results.
  • Waveform W2 is a waveform of a voltage applied to the cathode (electrode layer 3-2) of the organic EL element 5-1 and the anode (electrode layer 3-2) of the organic EL element 5-2.
  • the waveform W2 has the same amplitude and phase as the waveform W1.
  • the waveform W2 is generated by a pulse output from a pulse generation circuit (not shown). Since the waveform W2 has the same amplitude and phase as the waveform W1, the anode of the organic EL element 5-1 (electrode layer 3-1) and the cathode of the organic EL element 5-1 (electrode layer 3-2) have the same potential. It becomes. Therefore, no discharge current flows through the parasitic capacitance C1.
  • the conductive member around the detection electrode is grounded (GND) in order to reduce the influence of noise.
  • the electrode layer 3-2 cannot be grounded, in the modified example, the cathode (electrode layer 3-3) of the organic EL element 5-2 is grounded.
  • the present inventors have found that when the cathode (electrode layer 3-3) of the organic EL element 5-2 is grounded, the current required for charging / discharging the capacitance Cf becomes too large.
  • the parasitic capacitance C2 is 1 ⁇ F
  • the amplitude of the pulse output from the detection circuit 8 is 2 V
  • the frequency of this pulse is 1 MHz.
  • the current required for charging and discharging the capacitance Cf is 2A. This is theoretically possible, but the touch sensor 10 using such a large current is not realistic.
  • FIG. 1 is a cross-sectional structure diagram of a surface light emitting device 1-1 according to the first embodiment.
  • the surface light emitting device 1-1 includes a transparent substrate 2, an electrode layer 3-1, an organic layer 4-1, an electrode layer 3-2, an organic layer 4-2, and an electrode layer 3-3. Prepare. On one surface 2a of the transparent substrate 2, an electrode layer 3-1, an organic layer 4-1, an electrode layer 3-2, an organic layer 4-2, and an electrode layer 3-3 are laminated in this order.
  • the other surface 2b of the transparent substrate 2 becomes a touch surface.
  • the transparent substrate 2 becomes a member having a touch surface.
  • a finger F is shown above the other surface 2b.
  • the transparent substrate 2 may have a single layer structure (for example, a transparent glass substrate) or a multilayer structure (for example, a structure in which a transparent glass substrate and a transparent film are laminated).
  • the organic EL element 5-1 is constituted by the electrode layer 3-1, the organic layer 4-1, and the electrode layer 3-2.
  • the electrode layer 3-2, the organic layer 4-2, and the electrode layer 3-3 constitute an organic EL element 5-2. Accordingly, the organic EL element 5-1 and the organic EL element 5-2 are laminated on one surface 2a of the transparent substrate 2, and these are connected in series.
  • the number of stacked organic EL elements 5 is two has been described as an example, the number of stacked layers is not limited to two and may be plural.
  • the surface light emitting device 1-1 includes a plurality of electrode layers in which the electrode layers 3 and the organic layers 4 are alternately stacked on the other surface 2b (touch surface) side of the transparent substrate 2. 3 and a plurality of organic layers 4, and a plurality of organic EL elements 5 connected in series.
  • the organic layer 4 has a structure in which, for example, a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer are laminated.
  • the light emission color of the light emitting layer provided in the organic layer 4-1 and the light emission color of the light emitting layer provided in the organic layer 4-2 may be the same or different.
  • the electrode layer 3-1 is a transparent electrode formed directly on the one surface 2 a of the transparent substrate 2.
  • the electrode layer 3-1 becomes an anode of the organic EL element 5-1.
  • the electrode layer 3-2 is a transparent electrode, and serves as a cathode of the organic EL element 5-1, and also as an anode of the organic EL element 5-2.
  • the organic EL element 5-1 and the organic EL element 5-2 are connected in series with the electrode layer 3-2 as a common electrode.
  • the electrode layer 3-3 is a metal electrode and serves as a cathode of the organic EL element 5-2.
  • the voltage applied to the electrode layer 3-1 and the electrode layer 3-2 emits light from the light emitting layer included in the organic layer 4-1, and the voltage applied to the electrode layer 3-2 and the electrode layer 3-3.
  • the light emitting layer included in the organic layer 4-2 emits light, and light L from these light emitting layers is emitted through the transparent substrate 2.
  • FIG. 2 is a circuit configuration diagram of the surface light-emitting device 1-1 according to the first embodiment.
  • the surface light emitting device 1-1 includes organic EL elements 5-1 and 5-2, an overall control unit 6, drive circuits 7-1 and 7-2, a detection circuit 8, and pulse generation circuits 9-1 and 9 -2 and switches SW1 to SW7.
  • C1 is a parasitic capacitance of the organic EL element 5-1.
  • C2 is a parasitic capacitance of the organic EL element 5-2.
  • Cf is a capacitance generated when the finger F approaches or comes into contact with the transparent substrate 2 (FIG. 1).
  • the overall controller 6 controls the entire surface light emitting device 1-1. Specifically, the drive circuits 7-1 and 7-2, the detection circuit 8, the pulse generation circuits 9-1 and 9-2, and Controls the switches SW1 to SW7.
  • the overall control unit 6 is realized by hardware (CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), etc.), software, and the like.
  • the drive circuit 7-1 is a circuit that controls the operation of the organic EL element 5-1. This control includes on / off control of the organic EL element 5-1, control of the magnitude of the forward voltage / current applied to the organic EL element 5-1, and the like.
  • the drive circuit 7-1 includes a power supply circuit (for example, a DCDC converter) that generates the forward voltage.
  • the plus terminal of the drive circuit 7-1 is connected to the anode of the organic EL element 5-1 through the switch SW2.
  • the minus terminal of the drive circuit 7-1 is connected to the cathode of the organic EL element 5-1 through the switch SW3.
  • the drive circuit 7-2 is a circuit that controls the operation of the organic EL element 5-2. This control includes on / off control of the organic EL element 5-2, control of the magnitude of the forward voltage / current applied to the organic EL element 5-2, and the like.
  • the drive circuit 7-2 includes a power supply circuit (for example, a DCDC converter) that generates the forward voltage.
  • the plus terminal of the drive circuit 7-2 is connected to the anode of the organic EL element 5-2 through the switch SW4.
  • the minus terminal of the drive circuit 7-2 is connected to the cathode of the organic EL element 5-2 through the switch SW5.
  • the detection circuit 8 is connected to the anode of the organic EL element 5-1 through the switch SW1. This anode is the electrode layer 3-1 shown in FIG.
  • the electrode layer 3-1 is the electrode layer 3 closest to the transparent substrate 2.
  • a touch sensor 10 is configured by the detection circuit 8 and the electrode layer 3-1.
  • the electrode layer 3-1 is used as a detection electrode of the touch sensor 10.
  • the detection circuit 8 generates a predetermined pulse to be applied to the detection electrode (electrode layer 3-1). For example, the predetermined pulse has an amplitude of 2 V and a frequency of several megahertz.
  • the pulse generation circuit 9-1 is connected to the cathode of the organic EL element 5-1 and the anode of the organic EL element 5-2 via the switch SW6.
  • the pulse generation circuit 9-2 is connected to the cathode of the organic EL element 5-2 through the switch SW7.
  • the pulse generation circuit 9 is an example of a voltage generation unit.
  • the voltage generation unit is connected to at least one electrode layer other than the electrode layer used as the detection electrode among the plurality of electrode layers 3, and applies a voltage having the same potential as the detection electrode to the connected electrode layer. .
  • the switches SW1 to SW7 are, for example, transistors.
  • the overall control unit 6 controls the switches SW1 to SW7 to alternately repeat the light emission period and the detection period.
  • the light emission period is a period during which the organic EL element 5 emits light.
  • the detection period is a period during which the touch sensor 10 detects a touch.
  • the organic EL element 5 does not emit light during the detection period.
  • the touch sensor 10 does not detect a touch during the light emission period.
  • the overall control unit 6 repeats the light emission period and the detection period at a frequency of several tens of hertz or more. As a result, it seems to humans that continuous light emission is possible, and touch detection is always possible.
  • the third control unit is configured by the overall control unit 6 and the switches SW1 to SW7.
  • the third control unit performs control to alternately generate the detection period and the light emission period.
  • FIG. 3 is a waveform diagram showing waveforms of voltages applied to the electrode layers 3 shown in FIG. 1 during the detection period of the surface light emitting device 1-1 according to the first embodiment.
  • a difference from the waveform diagram shown in FIG. 18 is that a waveform W3 is added. Since the waveform W1 and the waveform W2 have been described in the comparative example, description thereof will be omitted.
  • the waveform W2 is generated by the pulse output from the pulse generation circuit 9-1.
  • waveform W3 is a waveform of a voltage applied to the cathode (electrode layer 3-3) of organic EL element 5-2.
  • the waveform W3 has the same amplitude and phase as the waveform W2. Therefore, the waveform W1, the waveform W2, and the waveform W3 have the same amplitude and phase.
  • the waveform W3 is generated by the pulse output from the pulse generation circuit 9-2. Since the waveform W3 has the same amplitude and phase as the waveform W2, the anode (electrode layer 3-2) of the organic EL element 5-2 and the cathode (electrode layer 3-3) of the organic EL element 5-2 have the same potential. Become. Therefore, no discharge current flows through the parasitic capacitance C2.
  • the pulse generation circuits 9-1 and 9-2 output pulses having the same amplitude and frequency as the pulses output from the detection circuit 8.
  • the overall control unit 6 synchronizes the pulse output from the detection circuit 8, the pulse output from the pulse generation circuit 9-1, and the pulse output from the pulse generation circuit 9-2.
  • the waveform W1, the waveform W2, and the waveform W3 have the same amplitude and phase.
  • the electrode layers 3-2 and 3-3 have the same potential as the electrode layer 3-1 (detection electrode).
  • the first control unit including the overall control unit 6, the pulse generation circuits 9-1 and 9-2, and the switches SW6 and SW7.
  • the first control unit converts each of the electrode layers 3 other than the electrode layer used as the detection electrode (electrode layers 3-2 and 3-3) to the detection electrode (electrode layer 3). Control to the same potential as -1).
  • the surface light-emitting device 1-1 does not ground the cathode of the organic EL element 5-2, and outputs a pulse output from the pulse generation circuit 9-2 during the detection period. 2 is applied to the cathode.
  • the anode (electrode layer 3-2) of the organic EL element 5-2 and the cathode (electrode layer 3-3) of the organic EL element 5-2 have the same potential during the detection period. Therefore, no discharge current flows through the parasitic capacitance C2 during the detection period.
  • the anode (electrode layer 3-1) of the organic EL element 5-1 and the cathode (electrode layer 3-2) of the organic EL element 5-1 have the same potential. Therefore, no discharge current flows through the parasitic capacitance C1.
  • the surface light emitting device 1-1 according to the first embodiment current (discharge current) can be prevented from flowing through the parasitic capacitances C1 and C2 during the detection period. Therefore, according to the surface light emitting device 1-1 according to the first embodiment, even if the current supplied to the detection electrode (electrode layer 3-1) from the touch sensor 10 (current used for touch detection) is not increased, Touch detection is possible.
  • the pulse generation circuit 9-1 (voltage generation unit) includes an electrode layer 3-2 (cathode of the organic EL element 5-1) positioned next to the electrode layer 3-1 used as a detection electrode among the plurality of electrode layers 3. ). Since the electrode layer 3-2 is not in an open state and is connected to the pulse generation circuit 9-1 (voltage generation unit), a shielding effect is generated. Therefore, the detection electrode can be made less susceptible to noise.
  • the overall control unit 6 completely disconnects the drive circuit 7 from the organic EL element 5 by turning off the switches SW2, SW3, SW4, and SW5 during the detection period. Thereby, since the drive circuit 7 does not become a capacitor during the detection period, it is possible to prevent an increase in current (current used for touch detection) supplied from the touch sensor 10 to the detection electrode due to the drive circuit 7. .
  • the overall control unit 6 may turn on the drive circuit 7 to turn on the organic EL element 5 (light emission), and turn off the drive circuit 7 to turn off the organic EL element 5.
  • the overall control unit 6 controls the detection circuit 8 to be turned on so that the detection circuit 8 supplies a pulse to the detection electrode (electrode layer 3-1), and controls the detection circuit 8 to be turned off so that the detection circuit 8 It may not be supplied to the electrode layer 3-1).
  • the overall control unit 6 controls the pulse generation circuit 9 to be turned on so that the pulse generation circuit 9 supplies the pulse to the electrode layer 3, and controls the pulse generation circuit 9 to be off and the pulse generation circuit 9 supplies the pulse to the electrode layer 3. You may make it not. In this way, the switch SW becomes unnecessary. This can be said also about the modified example demonstrated below, other embodiment, and the modified example of other embodiment.
  • FIG. 4 is an explanatory diagram illustrating the state of each electrode layer 3 during the detection period in each of the first embodiment, the first modification, the second modification, and the third modification.
  • the electrode layer 3-1 is used as a detection electrode during the detection period, and the pulse output from the pulse generation circuit 9-1 is applied to the electrode layer 3-2.
  • the pulse output from the pulse generation circuit 9-2 is applied to the electrode layer 3-3.
  • the electrode layer 3-1 is used as a detection electrode during the detection period, the pulse output from the pulse generation circuit 9-1 is applied to the electrode layer 3-2, and the electrode layer 3-3 is The open state is set. Modification 1 will be described in detail.
  • Modification 1 does not include the pulse generation circuit 9-2 and the switch SW7 among the elements constituting the surface light emitting device 1-1 shown in FIG.
  • the overall control unit 6 of Modification 1 turns on the switches SW2, SW3, SW4, and SW5 during the light emission period, turns off the switches SW1 and SW6, and turns off the switches SW2, SW3, SW4, and SW5 during the detection period. And switches SW1 and SW6 are turned on.
  • the waveform of the voltage applied to each electrode layer 3 during the detection period is the same as in the first embodiment (FIG. 3).
  • the cathode (electrode layer 3-3) of the organic EL element 5-2 is in the open state.
  • the electrode layer 3-3 is capacitively coupled to the electrode layer 3-2 by the parasitic capacitance C2.
  • the voltage of the waveform W3 is applied to the cathode (electrode layer 3-3) of the organic EL element 5-2. That is, even if the pulse output from the pulse generation circuit 9-2 is not applied to the cathode (electrode layer 3-3) of the organic EL element 5-2, the cathode (electrode layer 3- The voltage of the waveform W3 is applied to 3).
  • the electrode layer 3-1 is used as a detection electrode during the detection period, the electrode layer 3-2 is opened, and a pulse is generated in the electrode layer 3-3.
  • the pulse output from the circuit 9-2 is applied. Modification 2 will be described in detail.
  • Modification 2 does not include the pulse generation circuit 9-1 and the switch SW6 among the elements constituting the surface light emitting device 1-1 shown in FIG.
  • the overall control unit 6 of Modification 2 turns on the switches SW2, SW3, SW4, and SW5 during the light emission period, turns off the switches SW1 and SW7, and turns off the switches SW2, SW3, SW4, and SW5 during the detection period. And switches SW1 and SW7 are turned on.
  • the waveform of the voltage applied to each electrode layer 3 during the detection period is the same as in the first embodiment (FIG. 3). Even if the modified example 2 does not include the pulse generation circuit 9-1 and the switch SW6, the cathode of the organic EL element 5-1 (electrode layer 3-2) and the anode of the organic EL element 5-2 (electrode layer) The reason why the waveform of the voltage applied to 3-2) is the waveform W2 will be described.
  • the cathode of the organic EL element 5-1 (electrode layer 3-2) and the anode of the organic EL element 5-2 ( The electrode layer 3-2) is in an open state.
  • the electrode layer 3-2 is capacitively coupled to the electrode layer 3-1 by the parasitic capacitance C1, and capacitively coupled to the electrode layer 3-3 by the parasitic capacitance C2.
  • the voltage of the waveform W2 is applied to the cathode (electrode layer 3-2) of the organic EL element 5-1 and the anode (electrode layer 3-2) of the organic EL element 5-2.
  • the pulse output from the pulse generation circuit 9-1 is applied to the cathode (electrode layer 3-2) of the organic EL element 5-1 and the anode (electrode layer 3-2) of the organic EL element 5-2. Even if not, the voltage of the waveform W2 is applied to them.
  • electrode layer 3-1 is used as a detection electrode, and electrode layers 3-2 and 3-3 are in an open state. Modification 3 will be described in detail.
  • Modification 3 does not include the pulse generation circuits 9-1 and 9-2 and the switches SW6 and SW7 among the elements constituting the surface light emitting device 1-1 shown in FIG.
  • the overall control unit 6 of Modification 3 turns on the switches SW2, SW3, SW4, and SW5 during the light emission period, and turns off the switches SW2, SW3, SW4, and SW5 during the detection period.
  • the waveform of the voltage applied to each electrode layer 3 during the detection period is the same as that in the first embodiment (FIG. 3). Even if the third modification does not include the pulse generation circuits 9-1 and 9-2 and the switches SW6 and SW7, the cathode (electrode layer 3-2) of the organic EL element 5-1 and the organic EL element 5-
  • the waveform of the voltage applied to the second anode (electrode layer 3-2) is the waveform W2
  • the waveform of the voltage applied to the cathode (electrode layer 3-3) of the organic EL element 5-2 is the waveform W3.
  • the cathode of the organic EL element 5-1 (electrode layer 3-2) and the anode of the organic EL element 5-2 ( The electrode layer 3-2) is in an open state. Since the switch SW5 is in an off state during the detection period, the cathode (electrode layer 3-3) of the organic EL element 5-2 is in an open state.
  • the electrode layer 3-2 is capacitively coupled to the electrode layer 3-1 by the parasitic capacitance C1
  • the electrode layer 3-3 is capacitively coupled to the electrode layer 3-1 by the parasitic capacitances C1 and C2 connected in series. Is done.
  • the voltage of the waveform W2 is applied to the cathode (electrode layer 3-2) of the organic EL element 5-1 and the anode (electrode layer 3-2) of the organic EL element 5-2, and the organic EL element
  • the voltage of the waveform W3 is applied to the cathode (electrode layer 3-3) of 5-2. That is, the pulse output from the pulse generation circuit 9-1 is applied to the cathode (electrode layer 3-2) of the organic EL element 5-1 and the anode (electrode layer 3-2) of the organic EL element 5-2. Even if the voltage of waveform W2 is applied to them, the pulse output from the pulse generation circuit 9-2 is not applied to the cathode (electrode layer 3-3) of the organic EL element 5-2. The voltage of waveform W3 is applied to this.
  • FIG. 5 is an explanatory diagram for explaining each period that occurs in the fourth modification of the first embodiment. 2 and 5, the detection period, the light emission period of organic EL element 5-1, and the light emission period of organic EL element 5-2 are repeated in this order.
  • the detection period is a period during which the touch sensor 10 detects a touch
  • the overall control unit 6 turns off the switches SW2, SW3, SW4, SW5 during the detection period, and switches SW1, SW6, SW6. SW7 is turned on.
  • the overall control unit 6 turns on the switches SW2 and SW3 and turns off the switches SW1, SW4, SW5, SW6 and SW7 during the light emission period of the organic EL element 5-1.
  • the organic EL element 5-1 emits light, and the organic EL element 5-2 does not emit light.
  • the overall control unit 6 turns on the switches SW4 and SW5 and turns off the switches SW1, SW2, SW3, SW6 and SW7 during the light emission period of the organic EL element 5-2.
  • the organic EL element 5-2 emits light
  • the organic EL element 5-1 does not emit light.
  • the detection period and the light emission period are alternately generated.
  • the organic EL elements 5-1 and 5-2 emit light.
  • the voltage applied to one organic EL element 5 during the light emission period is, for example, 3V.
  • a voltage of 6 V is generated in a circuit in which the organic EL element 5-1 and the organic EL element 5-2 are connected in series. Therefore, when switching from the light emission period to the detection period, a voltage of 6 V may be applied to the detection circuit 8. For this reason, since the detection circuit 8 that can withstand a voltage of 6 V is required, it is necessary to increase the breakdown voltage of the detection circuit 8.
  • the organic EL element 5-1 and the organic EL element 5-2 are driven in a time division manner. Accordingly, a voltage of 6V is not generated in the circuit in which the organic EL element 5-1 and the organic EL element 5-2 are connected in series, and a voltage of 3V is generated. Thereby, when switching from the light emission period (light emission period of the organic EL element 5-2) to the detection period, a voltage of 3 V may be applied to the detection circuit 8. For this reason, it is not necessary for the detection circuit 8 to withstand a voltage of 6V, as long as it can withstand a voltage of 3V. Therefore, it is possible to eliminate the need for increasing the breakdown voltage of the detection circuit 8. Therefore, a normal low withstand voltage detection circuit can be used as the detection circuit 8.
  • FIG. 6 is a circuit configuration diagram of the surface light emitting device 1-2 according to the second embodiment.
  • the cross-sectional structure diagram of the surface light-emitting device 1-2 according to the second embodiment is the same as the cross-sectional structure diagram of the surface light-emitting device 1-1 according to the first embodiment shown in FIG.
  • the surface light emitting device 1-2 according to the second embodiment will be described while referring to differences from the surface light emitting device 1-1 according to the first embodiment.
  • the detection circuit 8 includes a cathode (electrode layer 3-2) of the organic EL element 5-1, and an anode (electrode layer 3-2) of the organic EL element 5-2. It is connected via the switch SW1.
  • the pulse generation circuit 9-1 is connected to the anode (electrode layer 3-1) of the organic EL element 5-1 through the switch SW6.
  • FIG. 7 is a waveform diagram showing waveforms of voltages applied to the electrode layers 3 shown in FIG. 1 during the detection period of the surface light emitting device 1-2 according to the second embodiment.
  • the voltage of the waveform W1 is applied to the anode (electrode layer 3-1) of the organic EL element 5-1, and the cathode (electrode layer 3-3-1) of the organic EL element 5-1. 2) and the voltage of the waveform W2 is applied to the anode (electrode layer 3-2) of the organic EL element 5-2, and the waveform of the waveform is applied to the cathode (electrode layer 3-3) of the organic EL element 5-2.
  • a voltage of W3 is applied.
  • the waveform W1 is generated by the pulse output from the pulse generation circuit 9-1
  • the waveform W2 is generated by the pulse output from the detection circuit 8
  • the waveform W3 is generated by the pulse generation circuit 9-9.
  • the pulse output from -2 causes the pulse output from -2.
  • the electrode layer 3-1 that is one end of the structure of the plurality of organic EL elements 5 connected in series is an anode.
  • the touch sensor 10 uses any one of the plurality of electrode layers 3 other than the electrode layer 3-1 (here, the electrode layer 3-2) as a detection electrode. Thereby, when switching from the light emission period to the detection period, the voltage applied to the detection circuit 8 is changed to the voltage (for example, 6 V) applied to the series circuit of the organic EL element 5-1 and the organic EL element 5-2.
  • the voltage applied to the organic EL element 5-2 (for example, 3V) can be used instead. Therefore, according to the second embodiment, it is possible to eliminate the need to increase the withstand voltage of the detection circuit 8 as in the fourth modification of the first embodiment.
  • FIG. 8 is a circuit configuration diagram of a surface light emitting device 1-3 according to a modification of the second embodiment. The surface light emitting device 1-3 will be described while referring to differences from the surface light emitting device 1-2 according to the second embodiment shown in FIG.
  • the detection circuit 8 is connected to the cathode (electrode layer 3-3) of the organic EL element 5-2 via the switch SW1.
  • the pulse generation circuit 9-2 is connected to the cathode (electrode layer 3-2) of the organic EL element 5-1 and the anode (electrode layer 3-2) of the organic EL element 5-2 via the switch SW7. ing.
  • FIG. 9 is a cross-sectional view of a surface light emitting device 1-4 according to the third embodiment.
  • the surface light emitting device 1-4 is different from the surface light emitting device 1-1 shown in FIG. 1 in that the electrode layer 3-1 has a structure in which it is divided into a plurality of partial electrodes 11.
  • FIG. 9 shows partial electrodes 11-1, 11-2, and 11-3.
  • the plurality of partial electrodes 11 are arranged side by side with a predetermined interval in a direction orthogonal to a direction (stacking direction) in which the electrode layers 3 and the organic layers 4 are alternately stacked.
  • FIG. 10 is an equivalent circuit diagram of the organic EL element 5 provided in the surface light emitting device 1-4 according to the third embodiment. There are the same number of organic EL elements 5-1 as the number of the partial electrodes 11. These organic EL elements 5-1 are connected in parallel.
  • the plurality of partial electrodes 11 are arranged side by side at a predetermined interval, and no electrode layer 3-1 exists between the adjacent partial electrodes 11. For this reason, the area of the electrode layer 3-1 including the plurality of partial electrodes 11 is smaller than the area of the electrode layer 3-1 shown in FIG. Therefore, when the electrode layer 3-1 including the plurality of partial electrodes 11 is used as a detection electrode, the touch detection sensitivity of the touch sensor 10 is lowered. There are electrode layers 3-2 and 3-3 as detection electrode candidates. When the detection electrode is closer to the touch surface (the other surface 2b of the transparent substrate 2), the touch detection sensitivity of the touch sensor 10 increases. Therefore, in the third embodiment, the electrode layer 3-2 is used as a detection electrode.
  • FIG. 11 is a circuit configuration diagram of the surface emitting device 1-4 according to the third embodiment.
  • the surface light emitting device 1-4 will be described while referring to differences from the surface light emitting device 1-2 according to the second embodiment shown in FIG.
  • the surface light emitting device 1-4 further includes a plurality of switches SW8 for selecting each of the plurality of organic EL elements 5-1.
  • the number of organic EL elements 5-1 is n
  • the number of switches SW8 is n (switches SW8-1 to SW8-n).
  • the n partial electrodes 11 are separated from each other.
  • the overall control unit 6 can selectively apply a voltage to the n partial electrodes 11 by selecting the switches SW8-1 to SW8-n during the light emission period.
  • the n organic EL elements 5-1 can selectively emit light, and an image (for example, a character image) can be displayed on the surface light emitting device 1-4.
  • FIG. 12 is an explanatory diagram illustrating the state of each electrode layer 3 during the detection period in each of the third embodiment, the first modification, the second modification, and the third modification.
  • FIG. 12 is the same as FIG. 4 except that the detection electrode is not the electrode layer 3-1, but the electrode layer 3-2.
  • the electrode layer 3-1 closer to the transparent substrate 2 than the detection electrode (in other words, the electrode layer 3-1 closer to the touch surface) is applied with a pulse (third embodiment, modified) Example 1) and the open state (Modification 2 and Modification 3) each have advantages.
  • a pulse since the electrode layer 3-1 is connected to the pulse generation circuit 9-1 (voltage generation unit), a shielding effect is produced. Therefore, the detection electrode can be made less susceptible to noise. However, in this case, the touch detection sensitivity of the touch sensor 10 decreases due to the shielding effect.
  • the electrode layer 3-1 is in the open state, the shielding effect does not occur, so that the touch detection sensitivity of the touch sensor 10 can be prevented from being lowered.
  • the surface light emitting device 1-2 according to the second embodiment shown in FIG. 6 also includes Modification 1, Modification 2, and Modification 3 shown in FIG.
  • FIG. 13 is a sectional view of a surface light emitting device 1-5 according to the fourth embodiment.
  • the surface light emitting device 1-5 is different from the surface light emitting device 1-4 shown in FIG. 9 in that the electrode layers 3-1 and 3-2 are divided into a plurality of partial electrodes 11 and 12, respectively. It is to prepare.
  • FIG. 13 shows partial electrodes 11-1, 11-2, 11-3 constituting the electrode layer 3-1, and partial electrodes 12-1, 12-2, 12-3 constituting the electrode layer 3-2. It is shown.
  • the plurality of partial electrodes 11 and 12 are arranged side by side with a predetermined interval in a direction orthogonal to a direction (stacking direction) in which the electrode layers 3 and the organic layers 4 are alternately stacked.
  • FIG. 14 is an equivalent circuit diagram of the organic EL element 5 provided in the surface light emitting device 1-5 according to the fourth embodiment. There are the same number of organic EL elements 5-1 as the number of the plurality of partial electrodes 11, and the same number of organic EL elements 5-2 as the number of the plurality of partial electrodes 12.
  • the electrode layer 3-1 is composed of a plurality of partial electrodes 11
  • the electrode layer 3-2 is composed of a plurality of partial electrodes 12
  • the electrode layer 3-3 is used as a detection electrode.
  • FIG. 15 is a circuit configuration diagram of a surface light emitting device 1-5 according to the fourth embodiment.
  • the surface light emitting device 1-5 will be described while referring to differences from the surface light emitting device 1-4 according to the third embodiment shown in FIG.
  • the detection circuit 8 is connected to the cathode (electrode layer 3-3) of the organic EL element 5-2 via the switch SW1.
  • the pulse generation circuit 9-2 is connected to the cathode (electrode layer 3-2) of the organic EL element 5-1 and the anode (electrode layer 3-2) of the organic EL element 5-2 via the switch SW7. ing.
  • the surface light emitting device 1-5 further includes a plurality of switches SW9 for selecting each of the plurality of organic EL elements 5-2.
  • the number of organic EL elements 5-2 is n
  • the number of switches SW9 is n (switches SW9-1 to SW9-n).
  • the n partial electrodes 12 are separated from each other.
  • the overall control unit 6 can selectively apply a voltage to the n partial electrodes 12 by selecting the switches SW9-1 to SW9-n during the light emission period.
  • the n organic EL elements 5-2 can selectively emit light, and an image (for example, a character image) can be displayed on the surface light emitting device 1-5.
  • FIG. 16 is an explanatory diagram illustrating the state of each electrode layer 3 during the detection period in each of the fourth embodiment, Modification 1, Modification 2, and Modification 3.
  • FIG. 16 is the same as FIG. 4 except that the detection electrode is not the electrode layer 3-1, but the electrode layer 3-3, and a description thereof will be omitted.
  • the detection electrode can be made less susceptible to noise due to the shielding effect.
  • the electrode layers 3-1 and 3-2 closer to the transparent substrate 2 than the detection electrode (electrode layer 3-3) are in an open state (Modification 3) As described above, it is possible to prevent a decrease in touch detection sensitivity of the touch sensor 10.
  • the surface light emitting device 1-3 according to the modification of the second embodiment shown in FIG. 8 includes the modifications 1, 2, and 3 shown in FIG.
  • a non-light emitting intermediate layer may be provided between the light emitting layers.
  • the intermediate layer may be a charge generation layer or a multi-photon unit configuration.
  • Transparent substrate examples of the transparent substrate applicable to the organic EL element according to the present invention include transparent materials such as glass and plastic. Examples of the transparent substrate preferably used include glass, quartz, and a resin film.
  • the glass material examples include silica glass, soda lime silica glass, lead glass, borosilicate glass, and alkali-free glass.
  • the glass materials from the viewpoint of imparting adhesion with adjacent layers, durability, and smoothness, if necessary, physical treatment such as polishing, formation of a thin film made of inorganic or organic matter, A hybrid thin film combining these thin films can be formed.
  • polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyethylene, polypropylene, cellophane, cellulose diacetate, cellulose triacetate (TAC), cellulose acetate butyrate, and cellulose acetate.
  • Cellulose esters such as propionate (CAP), cellulose acetate phthalate, cellulose nitrate and their derivatives, polyvinylidene chloride, polyvinyl alcohol, polyethylene vinyl alcohol, syndiotactic polystyrene, polycarbonate, norbornene resin, polymethylpentene, poly Ether ketone, polyimide, polyethersulfone (PES), polyphenylene sulfide, Resulfones, polyetherimide, polyetherketoneimide, polyamide, fluororesin, nylon, polymethylmethacrylate, acrylic and polyarylates, Arton (trade name, manufactured by JSR) and Appel (trade name, manufactured by Mitsui Chemicals) And cycloolefin-based resins.
  • CAP propionate
  • CAP cellulose acetate phthalate
  • cellulose nitrate and their derivatives
  • polyvinylidene chloride polyvinyl alcohol
  • polyethylene vinyl alcohol syndiotact
  • the organic EL element may have a configuration in which a gas barrier layer is provided on the transparent substrate described above, if necessary.
  • the material for forming the gas barrier layer may be any material that has a function of suppressing entry of components such as moisture and oxygen that cause deterioration of the organic EL element.
  • inorganic materials such as silicon oxide, silicon dioxide, and silicon nitride Can be used.
  • anode electrode anode
  • the anode constituting the organic EL element include metals such as Ag and Au, alloys containing metal as a main component, CuI, indium-tin composite oxide (ITO), and metal oxides such as SnO 2 and ZnO.
  • metals such as Ag and Au
  • alloys containing metal as a main component CuI
  • metal oxides such as SnO 2 and ZnO.
  • a metal or a metal-based alloy is preferable, and silver or a silver-based alloy is more preferable.
  • the anode side is the light extraction side, it is necessary to be a transparent anode having optical transparency.
  • the transparent anode is a layer composed mainly of silver, specifically, it may be formed of silver alone or composed of an alloy containing silver (Ag) in order to ensure the stability of silver. May be.
  • alloys include silver / magnesium (Ag / Mg), silver / copper (Ag / Cu), silver / palladium (Ag / Pd), silver / palladium / copper (Ag / Pd / Cu), silver -Indium (Ag * In), silver * gold (Ag * Au), etc. are mentioned.
  • the anode constituting the organic EL device according to the present invention is a transparent anode composed mainly of silver and having a thickness in the range of 2 to 20 nm.
  • the thickness is preferably in the range of 4 to 12 nm.
  • a thickness of 20 nm or less is preferable because the absorption component and reflection component of the transparent anode can be kept low and high light transmittance can be maintained.
  • the layer composed mainly of silver means that the silver content in the transparent anode is 60% by mass or more, preferably the silver content is 80% by mass or more, More preferably, the silver content is 90% by mass or more, and particularly preferably the silver content is 98% by mass or more.
  • transparent in the transparent anode according to the present invention means that the light transmittance at a wavelength of 550 nm is 50% or more.
  • the transparent anode may have a configuration in which a layer composed mainly of silver is divided into a plurality of layers as necessary.
  • a base layer may be provided at the lower portion from the viewpoint of improving the uniformity of the silver film of the transparent anode to be formed.
  • a base layer it is a layer containing the organic compound which has a nitrogen atom or a sulfur atom, and the method of forming a transparent anode on the said base layer is a preferable aspect.
  • the organic EL device has a structure in which two or more organic functional layer units each composed of an organic functional layer group and a light emitting layer are laminated between an anode and a cathode, and two or more organic functions It is possible to adopt a structure in which the layer units are separated by an intermediate electrode layer unit having independent connection terminals for obtaining electrical connection.
  • the light emitting layer constituting the organic EL element preferably has a structure containing a phosphorescent compound or a fluorescent compound as a light emitting material.
  • This light emitting layer is a layer that emits light by recombination of electrons injected from the electrode or the electron transport layer and holes injected from the hole transport layer, and the light emitting portion is in the layer of the light emitting layer. Alternatively, it may be the interface between the light emitting layer and the adjacent layer.
  • Such a light emitting layer is not particularly limited in its configuration as long as the light emitting material contained satisfies the light emission requirements. Moreover, there may be a plurality of layers having the same emission spectrum and emission maximum wavelength. In this case, it is preferable to have a non-light emitting intermediate layer between the light emitting layers.
  • the total thickness of the light emitting layers is preferably in the range of 1 to 100 nm, and more preferably in the range of 1 to 30 nm because a lower driving voltage can be obtained.
  • the sum total of the thickness of a light emitting layer is the thickness also including the said intermediate
  • the light emitting layer as described above is a known material such as a vacuum evaporation method, a spin coating method, a casting method, an LB method (Langmuir-Blodget, Langmuir Blodgett method), or an inkjet method. It can be formed by applying the method.
  • the light emitting layer may be a mixture of a plurality of light emitting materials, and a phosphorescent light emitting material and a fluorescent light emitting material (also referred to as a fluorescent dopant or a fluorescent compound) may be mixed and used in the same light emitting layer.
  • the structure of the light-emitting layer preferably includes a host compound (also referred to as a light-emitting host) and a light-emitting material (also referred to as a light-emitting dopant compound) and emits light from the light-emitting material.
  • ⁇ Host compound> As the host compound contained in the light emitting layer, a compound having a phosphorescence quantum yield of phosphorescence emission at room temperature (25 ° C.) of less than 0.1 is preferable. Further, the phosphorescence quantum yield is preferably less than 0.01. Moreover, it is preferable that the volume ratio in the layer is 50% or more among the compounds contained in a light emitting layer.
  • a known host compound may be used alone, or a plurality of types of host compounds may be used.
  • a plurality of types of host compounds it is possible to adjust the movement of charges, and the efficiency of the organic electroluminescent device can be improved.
  • a plurality of kinds of light emitting materials described later it is possible to mix different light emission, thereby obtaining an arbitrary light emission color.
  • the host compound used in the light emitting layer may be a conventionally known low molecular compound or a high molecular compound having a repeating unit, and a low molecular compound having a polymerizable group such as a vinyl group or an epoxy group (evaporation polymerizable light emitting host). )
  • a phosphorescent compound also referred to as a phosphorescent compound, a phosphorescent material, or a phosphorescent dopant
  • a fluorescent compound both a fluorescent compound or a fluorescent material
  • a phosphorescent compound is a compound in which light emission from an excited triplet is observed. Specifically, it is a compound that emits phosphorescence at room temperature (25 ° C.) and has a phosphorescence quantum yield of 25 ° C. The phosphorescence quantum yield is preferably 0.1 or more.
  • the phosphorescent quantum yield can be measured by the method described in Spectroscopic II, page 398 (1992 edition, Maruzen) of the Fourth Edition Experimental Chemistry Course 7.
  • the phosphorescence quantum yield in the solution can be measured using various solvents, but when using a phosphorescent compound in the present invention, the phosphorescence quantum yield is 0.01 or more in any solvent. Should be achieved.
  • the phosphorescent compound can be appropriately selected from known compounds used for the light-emitting layer of a general organic EL device, but preferably contains a group 8 to 10 metal in the periodic table of elements. More preferred are iridium compounds, more preferred are iridium compounds, osmium compounds, platinum compounds (platinum complex compounds) or rare earth complexes, and most preferred are iridium compounds.
  • one light-emitting layer may contain two or more phosphorescent compounds, and the concentration ratio of the phosphorescent compound in the light-emitting layer varies in the thickness direction of the light-emitting layer. It may be a mode.
  • preferred phosphorescent compounds include organometallic complexes having Ir as a central metal. More preferably, a complex containing at least one coordination mode of a metal-carbon bond, a metal-nitrogen bond, a metal-oxygen bond, and a metal-sulfur bond is preferable.
  • Fluorescent compounds include coumarin dyes, pyran dyes, cyanine dyes, croconium dyes, squalium dyes, oxobenzanthracene dyes, fluorescein dyes, rhodamine dyes, pyrylium dyes, perylene dyes, stilbene dyes. And dyes, polythiophene dyes, and rare earth complex phosphors.
  • each layer other than the light emitting layer constituting the organic functional layer unit will be described in the order of a charge injection layer, a hole transport layer, an electron transport layer, and a blocking layer.
  • the charge injection layer is a layer provided between the electrode and the light emitting layer in order to lower the driving voltage and improve the light emission luminance, and includes a hole injection layer and an electron injection layer.
  • the charge injection layer is present between the anode and the light emitting layer or the hole transport layer in the case of a hole injection layer, and between the cathode and the light emitting layer or the electron transport layer in the case of an electron injection layer.
  • the present invention is characterized in that the charge injection layer is disposed adjacent to the transparent electrode. When used in an intermediate electrode, it is sufficient that at least one of the adjacent electron injection layer and hole injection layer satisfies the requirements of the present invention.
  • the hole injection layer is a layer disposed adjacent to the anode, which is a transparent electrode, in order to reduce drive voltage and improve light emission luminance.
  • Examples of materials used for the hole injection layer include porphyrin derivatives, phthalocyanine derivatives, oxazole derivatives, oxadiazole derivatives, triazole derivatives, imidazole derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, hydrazone derivatives, stilbene derivatives, poly Aryl-alkane derivatives, triarylamine derivatives, carbazole derivatives, indolocarbazole derivatives, isoindole derivatives, acene derivatives such as anthracene and naphthalene, fluorene derivatives, fluorenone derivatives, and polyvinylcarbazole, aromatic amines in the main chain or side chain Introduced polymer material or oligomer, polysilane, conductive polymer or oligomer (for example, PEDOT (polyethylenedioxythiophene): PS (Polystyrene sulfonic acid), aniline copo
  • triarylamine derivative examples include benzidine type represented by ⁇ -NPD (4,4′-bis [N- (1-naphthyl) -N-phenylamino] biphenyl), and MTDATA (4,4 ′, 4 ′′).
  • -Starburst type typified by -tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine), and compounds having fluorene or anthracene in the triarylamine linking core.
  • a hexaazatriphenylene derivative can be used as a hole transport material.
  • the electron injection layer is a layer provided between the cathode and the light emitting layer for lowering the driving voltage and improving the light emission luminance.
  • the cathode is composed of the transparent electrode according to the present invention, It is provided adjacent to the transparent electrode.
  • materials preferably used for the electron injection layer include metals typified by strontium and aluminum, alkali metal compounds typified by lithium fluoride, sodium fluoride, and potassium fluoride, magnesium fluoride, and fluoride.
  • the electron injection layer is preferably a very thin film, and depending on the constituent materials, the layer thickness is preferably in the range of 1 nm to 10 ⁇ m.
  • the hole transport layer is composed of a hole transport material having a function of transporting holes.
  • the hole injection layer and the electron blocking layer also have a function as a hole transport layer.
  • the hole transport layer can be provided as a single layer or a plurality of layers.
  • the hole transport material has any of hole injection or transport and electron barrier properties, and may be either organic or inorganic.
  • triazole derivatives oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine derivatives, amino-substituted chalcone derivatives, oxazole derivatives, styrylanthracene derivatives, fluorenone derivatives, hydrazone derivatives
  • Examples include stilbene derivatives, silazane derivatives, aniline copolymers, conductive polymer oligomers, and thiophene oligomers.
  • hole transport material those described above can be used, but porphyrin compounds, aromatic tertiary amine compounds and styrylamine compounds can be used, and in particular, aromatic tertiary amine compounds can be used. preferable.
  • aromatic tertiary amine compounds and styrylamine compounds include N, N, N ′, N′-tetraphenyl-4,4′-diaminophenyl, N, N′-diphenyl-N, N′— Bis (3-methylphenyl)-[1,1′-biphenyl] -4,4′-diamine (abbreviation: TPD), 2,2-bis (4-di-p-tolylaminophenyl) propane, 1,1 -Bis (4-di-p-tolylaminophenyl) cyclohexane, N, N, N ', N'-tetra-p-tolyl-4,4'-diaminobiphenyl, 1,1-bis (4-di-p -Tolylaminophenyl) -4-phenylcyclohexane, bis (4-dimethylamino-2-methylphenyl) phenylmethane, bis (4-di-p
  • the hole transport material may be formed by a known method such as a vacuum deposition method, a spin coating method, a casting method, a printing method including an ink jet method, and an LB method (Langmuir Brodget, Langmuir Brodgett method). Thus, it can be formed by thinning.
  • the layer thickness of the hole transport layer is not particularly limited, but is usually about 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
  • the hole transport layer may have a single layer structure composed of one or more of the above materials.
  • the p property can be increased by doping impurities into the material of the hole transport layer.
  • the electron transport layer is made of a material having a function of transporting electrons, and in a broad sense, the electron injection layer and the hole blocking layer also correspond to the electron transport layer.
  • the electron transport layer can be provided as a single layer structure or a stacked structure of a plurality of layers.
  • an electron transport material (also serving as a hole blocking material) constituting a layer portion adjacent to the light emitting layer is used as an electron transporting material. What is necessary is just to have the function to transmit.
  • any one of conventionally known compounds can be selected and used. Examples include nitro-substituted fluorene derivatives, diphenylquinone derivatives, thiopyran dioxide derivatives, carbodiimides, fluorenylidenemethane derivatives, anthraquinodimethane, anthrone derivatives, and oxadiazole derivatives.
  • a thiadiazole derivative in which the oxygen atom of the oxadiazole ring is substituted with a sulfur atom, and a quinoxaline derivative having a quinoxaline ring known as an electron-withdrawing group can also be used as a material for the electron transport layer. It can. Furthermore, a polymer material in which these materials are introduced into a polymer chain, or a polymer material having these materials as a polymer main chain can also be used.
  • metal complexes of 8-quinolinol derivatives such as tris (8-quinolinol) aluminum (abbreviation: Alq3), tris (5,7-dichloro-8-quinolinol) aluminum, tris (5,7-dibromo-8-quinolinol) ) Aluminum, tris (2-methyl-8-quinolinol) aluminum, tris (5-methyl-8-quinolinol) aluminum, bis (8-quinolinol) zinc (abbreviation: Znq), etc. and the central metal of these metal complexes is In Metal complexes replaced with Mg, Cu, Ca, Sn, Ga or Pb can also be used as the material for the electron transport layer.
  • the electron transport layer can be formed by thinning the above material by a known method such as a vacuum deposition method, a spin coating method, a casting method, a printing method including an inkjet method, and an LB method.
  • the thickness of the electron transport layer is not particularly limited, but is usually about 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
  • the electron transport layer may have a single structure composed of one or more of the above materials.
  • the blocking layer includes a hole blocking layer and an electron blocking layer, and is a layer provided as necessary in addition to the constituent layers of the organic functional layer unit 3 described above.
  • the hole blocking layer has a function of an electron transport layer in a broad sense.
  • the hole blocking layer is made of a hole blocking material that has a function of transporting electrons but has a very small ability to transport holes, and recombines electrons and holes by blocking holes while transporting electrons. Probability can be improved.
  • the structure of an electron carrying layer can be used as a hole-blocking layer as needed.
  • the hole blocking layer is preferably provided adjacent to the light emitting layer.
  • the electron blocking layer has a function of a hole transport layer in a broad sense.
  • the electron blocking layer is made of a material that has the ability to transport holes and has a very small ability to transport electrons. By blocking holes while transporting holes, the probability of recombination of electrons and holes is improved. Can be made.
  • the structure of a positive hole transport layer can be used as an electron blocking layer as needed.
  • the layer thickness of the hole blocking layer applied to the present invention is preferably in the range of 3 to 100 nm, and more preferably in the range of 5 to 30 nm.
  • the cathode is an electrode film that functions to supply holes to the organic functional layer group and the light emitting layer, and a metal, an alloy, an organic or inorganic conductive compound, or a mixture thereof is used. Specifically, gold, aluminum, silver, magnesium, lithium, magnesium / copper mixture, magnesium / silver mixture, magnesium / aluminum mixture, magnesium / indium mixture, indium, lithium / aluminum mixture, rare earth metal, ITO, ZnO, TiO Oxide semiconductors such as 2 and SnO 2 .
  • the cathode can be produced by forming a thin film of these conductive materials by a method such as vapor deposition or sputtering.
  • the sheet resistance as the second electrode is preferably several hundred ⁇ / ⁇ or less, and the film thickness is usually selected within the range of 5 nm to 5 ⁇ m, preferably 5 to 200 nm.
  • the organic EL element is a method in which emitted light is extracted also from the cathode side or a double-sided light emitting type
  • a cathode having good light transmittance may be selected and configured.
  • sealing member examples of the sealing means used for sealing the organic EL element include a method in which a sealing member, a cathode, and a transparent substrate are bonded with an adhesive.
  • the sealing member may be disposed so as to cover the display area of the organic EL element, and may be concave or flat. Further, transparency and electrical insulation are not particularly limited.
  • the sealing member include a glass plate, a polymer plate, a film, a metal plate, and a film.
  • the glass plate include soda lime glass, barium / strontium-containing glass, lead glass, aluminosilicate glass, borosilicate glass, barium borosilicate glass, and quartz.
  • the polymer plate include a plate made of polycarbonate, acrylic, polyethylene terephthalate, polyether sulfide, polysulfone, or the like.
  • the metal plate include one or more metals or alloys selected from the group consisting of stainless steel, iron, copper, aluminum, magnesium, nickel, zinc, chromium, titanium, molybdenum, silicon, germanium, and tantalum.
  • the sealing member a polymer film and a metal film can be preferably used from the viewpoint of reducing the thickness of the organic EL element. Furthermore, the polymer film has a water vapor transmission rate of 1 ⁇ 10 ⁇ 3 g / m 2 at a temperature of 25 ⁇ 0.5 ° C. and a relative humidity of 90 ⁇ 2% RH measured by a method according to JIS K 7129-1992.
  • the oxygen permeability measured by a method according to JIS K 7126-1987 is 1 ⁇ 10 ⁇ 3 ml / m 2 ⁇ 24 h ⁇ atm (1 atm is 1.01325) ⁇ 10 5 is Pa) equal to or lower than a temperature of 25 ⁇ 0.5 ° C
  • the water vapor permeability at a relative humidity of 90 ⁇ 2% is preferably at most 1 ⁇ 10 -3 g / m 2 ⁇ 24h .
  • an inert gas such as nitrogen or argon, or an inert liquid such as fluorocarbon or silicon oil is injected in the gas phase and liquid phase. It is preferable to do. Further, the gap between the sealing member and the display area of the organic EL element can be evacuated, or a hygroscopic compound can be sealed in the gap.
  • the manufacturing method of an organic EL element is mainly a method of forming a laminate by laminating an anode, a first organic functional layer group, a light emitting layer, a second organic functional layer group, and a cathode on a transparent substrate. .
  • a transparent substrate is prepared, and a thin film made of a desired electrode material, for example, an anode material is deposited on the transparent substrate so as to have a thickness of 1 ⁇ m or less, preferably in the range of 10 to 200 nm.
  • the anode is formed by a method such as sputtering.
  • a connection electrode portion (for example, an anode electrode wiring drawn from the anode electrode of the organic EL element 5-1 shown in FIG. 2) connected to an external power source is formed at the anode end portion.
  • a hole injection layer and a hole transport layer constituting the first organic functional layer group, a light emitting layer, an electron transport layer constituting the second organic functional layer group, and the like are sequentially laminated thereon.
  • Examples of the method for forming each of these layers include spin coating, casting, ink jet, vapor deposition, and printing. From the viewpoints that a homogeneous layer can be easily obtained and pinholes are not easily generated. A vacuum deposition method or a spin coating method is particularly preferable. Further, different formation methods may be applied for each layer. When a vapor deposition method is employed for forming each of these layers, the vapor deposition conditions vary depending on the type of compound used, but generally the boat heating temperature is in the range of 50 to 450 ° C. and the degree of vacuum is 1 ⁇ 10 ⁇ 6.
  • a deposition rate within a range of 0.01 to 50 nm / second, a substrate temperature within a range of ⁇ 50 to 300 ° C., and a layer thickness of 0.1 to 5 ⁇ m It is desirable to appropriately select each condition within the range.
  • a cathode is formed on the upper portion by an appropriate forming method such as a vapor deposition method or a sputtering method. At this time, the cathode is patterned in a shape in which terminal portions are drawn from the upper side of the organic functional layer group to the periphery of the transparent substrate while maintaining an insulating state with respect to the anode by the organic functional layer group.
  • the transparent base material, the anode, the organic functional layer group, the light emitting layer, and the cathode are sealed with a sealing material. That is, a sealing material that covers at least the organic functional layer group is provided on the transparent base material in a state where the terminal portions of the anode and the cathode (leading wiring of each electrode) are exposed.
  • each electrode of the organic EL element is electrically connected to the detection circuit 8, the drive circuit 7, and the like.
  • the wiring is not particularly limited as long as it is a member having conductivity, but an anisotropic conductive film (ACF), a conductive paste, or a metal paste is a preferred embodiment.
  • anisotropic conductive film examples include a layer having fine conductive particles having conductivity mixed with a thermosetting resin.
  • the conductive particle-containing layer that can be used in the present invention is not particularly limited as long as it is a layer containing conductive particles as an anisotropic conductive member, and can be appropriately selected according to the purpose.
  • the conductive particles that can be used as the anisotropic conductive member according to the present invention are not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include metal particles and metal-coated resin particles.
  • Examples of commercially available ACFs include low-temperature curing ACFs that can also be applied to resin films, such as MF-331 (manufactured by Hitachi Chemical).
  • the metal particles include nickel, cobalt, silver, copper, gold, palladium, and the like.
  • the metal-coated resin particles for example, the surface of the resin core is any one of nickel, copper, gold, and palladium.
  • the metal paste may be a commercially available metal nanoparticle paste.
  • the organic electroluminescence module of the present invention is an organic electroluminescence module that can achieve small formatting and thinning, and can simplify the process, and is suitable for various smart devices such as smartphones and tablets and lighting devices. Available.
  • FIG. 19 is a schematic configuration diagram illustrating an example of a smart device 100 that includes the surface light emitting device 1 of the present invention in an icon portion.
  • the smart device 100 includes the surface light emitting device 1, the liquid crystal display device 120, and the like.
  • a conventionally known liquid crystal display device can be used as the liquid crystal display device 120.
  • FIG. 19 shows a state where the surface light emitting device 1 of the present invention emits light, and the light emission of various display patterns 111 is visually recognized when viewed from the front side.
  • the various display patterns 111 are not visually recognized.
  • the shape of the display pattern 111 shown in FIG. 19 is an example and is not limited thereto, and may be any figure, character, pattern, or the like.
  • the “display pattern” means a design (design or pattern in the figure), characters, images, etc. displayed by light emission of the organic EL element.
  • the surface light emitting device 1 of the present invention can also be applied to a lighting device.
  • the lighting device equipped with the surface light emitting device 1 of the present invention is also useful for display devices such as home lighting, interior lighting, and backlights of liquid crystal display devices.
  • backlights such as clocks, signboard advertisements, traffic lights, light sources such as optical storage media, light sources for electrophotographic copying machines, light sources for optical communication processing machines, light sources for optical sensors, etc.
  • backlights such as clocks, signboard advertisements, traffic lights, light sources such as optical storage media, light sources for electrophotographic copying machines, light sources for optical communication processing machines, light sources for optical sensors, etc.
  • There are a wide range of uses such as household appliances.
  • a surface light emitting device includes a transparent substrate having a touch surface, and a plurality of electrode layers in which electrode layers and organic layers are alternately stacked on the opposite side of the touch surface of the transparent substrate.
  • a plurality of organic EL elements that are connected in series, and a touch sensor that detects a change in capacitance by using any one of the plurality of electrode layers as a detection electrode;
  • a first control unit configured to control each of the plurality of electrode layers other than the electrode layer used as the detection electrode to have the same potential as the detection electrode during the detection period by the touch sensor.
  • the organic layer is a layer of an organic material including at least a light emitting layer.
  • a 1st control part controls each electrode layer other than the electrode layer utilized as a detection electrode among several electrode layers to the same electric potential as a detection electrode during the detection period by a touch sensor. Thereby, it can prevent that an electric current flows into each parasitic capacitance of a some organic EL element during a detection period. Therefore, according to the surface light-emitting device according to the embodiment, touch detection can be performed without increasing the current (current used for touch detection) supplied from the touch sensor to the detection electrode.
  • the first control unit is connected to at least one electrode layer other than the electrode layer used as the detection electrode among the plurality of electrode layers, and generates a voltage having the same potential as the detection electrode.
  • a voltage generation unit is provided to be applied to the connected electrode layers.
  • the electrode layer connected to the voltage generation unit can be controlled to the same potential as the detection electrode.
  • the first control unit may use all of the electrode layers other than the electrode layer used as the detection electrode as an electrode layer connected to the voltage generation unit, or each electrode layer other than the electrode layer used as the detection electrode. Among these, a certain electrode layer may be connected to the voltage generator. In the latter case, the remaining electrode layers are in an open state, which will be described later, whereby the remaining electrode layers are also controlled to the same potential as the detection electrodes.
  • the voltage generation unit is connected to an electrode layer located next to an electrode layer used as the detection electrode among the plurality of electrode layers.
  • the electrode layer located next to the detection electrode is not in an open state, but is connected to the voltage generation unit, so that a shielding effect occurs. Therefore, the detection electrode can be made less susceptible to noise.
  • the first control unit controls at least one of the plurality of electrode layers other than the electrode layer used as the detection electrode to be in an open state.
  • the electrode layer controlled to be in the open state is in the same potential as the detection electrode by capacitive coupling.
  • the first control unit may control all the electrode layers other than the electrode layer used as the detection electrode to be in an open state, or a certain electrode layer among the electrode layers other than the electrode layer used as the detection electrode May be controlled in an open state. In the latter case, the remaining electrode layer is connected to the voltage generation unit described above, whereby the remaining electrode layer is also set to the same potential as the detection electrode.
  • the first control unit controls, among the plurality of electrode layers, an electrode layer closer to the transparent base material than an electrode layer used as the detection electrode in an open state.
  • Shield effect is produced by the electrode layer connected to the voltage generator.
  • the voltage generation unit is connected to an electrode layer closer to the transparent base material than the electrode layer used as the detection electrode among the plurality of electrode layers, the touch detection sensitivity of the touch sensor is reduced due to the shielding effect.
  • the shielding effect does not occur in the electrode layer controlled in the open state. Therefore, according to this configuration, it is possible to prevent a decrease in touch detection sensitivity of the touch sensor.
  • the electrode layer serving as one end of the structure of the plurality of organic EL elements connected in series is an anode
  • the touch sensor includes the plurality of electrode layers, Any one electrode layer other than the electrode layer serving as one end is used as the detection electrode.
  • the potential of the anode is highest.
  • this anode is used as a detection electrode, a high voltage is applied to the touch detection circuit included in the touch sensor.
  • the touch sensor uses any one electrode layer other than the electrode layer serving as one end of the structure of the plurality of organic EL elements connected in series among the plurality of electrode layers as the detection electrode. The need to increase the breakdown voltage of the touch detection circuit can be eliminated. Therefore, a normal low breakdown voltage device can be used as the touch detection circuit.
  • an electrode layer including a plurality of partial electrodes arranged at intervals in a direction orthogonal to the alternately stacked directions is included in the plurality of electrode layers.
  • an electrode layer other than the electrode layer including the plurality of partial electrodes is used as the detection electrode.
  • An electrode layer having a plurality of partial electrodes is arranged with a gap in a direction perpendicular to the direction in which the electrode layers and the organic layers are alternately stacked. Compared with other electrode layers due to the presence of the gap portion. The area becomes smaller. For this reason, when an electrode layer including a plurality of partial electrodes is used as a detection electrode, the touch detection sensitivity of the touch sensor is lowered. According to this configuration, the touch sensor uses, as the detection electrode, an electrode layer other than the electrode layer including the plurality of partial electrodes among the plurality of electrode layers, so that the touch detection sensitivity of the touch sensor can be prevented from being lowered.
  • the above configuration further includes a second control unit that controls to drive the plurality of organic EL elements in a time-sharing manner.
  • the touch sensor uses one of the plurality of electrode layers as a detection electrode, voltages from a plurality of organic EL elements connected in series are applied to a touch detection circuit provided in the touch sensor. When this voltage is large, it is necessary to increase the breakdown voltage of the touch detection circuit.
  • the voltage applied to the touch detection circuit can be lowered when the plurality of organic EL elements connected in series are driven in a time division manner, rather than being driven simultaneously. According to this configuration, since the plurality of organic EL elements are driven in a time-sharing manner, it is possible to eliminate the need to increase the breakdown voltage of the touch detection circuit.
  • the above-described configuration further includes a third control unit that performs control to alternately generate the detection period and the light emission period for causing the plurality of organic EL elements to emit light.
  • This configuration is an aspect of a surface light emitting device including a touch sensor.
  • a surface light emitting device can be provided.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un dispositif d'émission de lumière plane, comprenant : une pluralité d'éléments électroluminescents organiques qui sont configurés à partir d'une pluralité de couches d'électrode et une pluralité de couches organiques qui ont été placées en alternance sur le côté opposé d'un autre plan (plan tactile) d'un substrat translucide, lesdits éléments ayant été connectés en série ; un capteur tactile qui utilise l'une de la pluralité de couches d'électrode en tant qu'électrode de détection (couche d'électrode) pour détecter un changement de capacité; et une première unité de commande qui, pendant la période de la détection à l'aide du capteur tactile, commande chacune des couches d'électrode, parmi la pluralité de couches d'électrode, qui sont autres que la couche d'électrode qui est utilisée en tant qu'électrode de détection, de telle sorte que le potentiel est le même entre l'électrode de détection et chacune des autres couches d'électrode.
PCT/JP2018/008890 2017-03-16 2018-03-08 Dispositif d'émission de lumière plane WO2018168617A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114388709A (zh) * 2021-12-20 2022-04-22 武汉天马微电子有限公司 显示面板及其制作方法和显示装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015182001A1 (fr) * 2014-05-30 2015-12-03 コニカミノルタ株式会社 Module électroluminescent organique, dispositif intelligent et dispositif d'éclairage
WO2016072246A1 (fr) * 2014-11-04 2016-05-12 コニカミノルタ株式会社 Élément électroluminescent organique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015182001A1 (fr) * 2014-05-30 2015-12-03 コニカミノルタ株式会社 Module électroluminescent organique, dispositif intelligent et dispositif d'éclairage
WO2016072246A1 (fr) * 2014-11-04 2016-05-12 コニカミノルタ株式会社 Élément électroluminescent organique

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114388709A (zh) * 2021-12-20 2022-04-22 武汉天马微电子有限公司 显示面板及其制作方法和显示装置
CN114388709B (zh) * 2021-12-20 2024-03-12 武汉天马微电子有限公司 显示面板及其制作方法和显示装置

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