WO2021214855A1 - 表示装置およびその駆動方法 - Google Patents
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- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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Definitions
- the following disclosure relates to a display device and its driving method, and particularly to a driving method of a display device that employs pause drive.
- organic EL display device including a pixel circuit including an organic EL element
- the organic EL element is also called an OLED (Organic Light-Emitting Diode), and is a self-luminous display element that emits light with a brightness corresponding to the current flowing through the organic EL element. Since the organic EL element is a self-luminous display element in this way, the organic EL display device is easily thinner, consumes less power, and has higher brightness than a liquid crystal display device that requires a backlight and a color filter. It can be changed.
- OLED Organic Light-Emitting Diode
- a thin film transistor (TFT) is typically adopted as a drive transistor for controlling the supply of current to the organic EL element.
- TFT thin film transistor
- the characteristics of thin film transistors are likely to vary. Specifically, the threshold voltage tends to vary. If the threshold voltage of the drive transistor provided in the display unit varies, the brightness of the drive transistor varies, and the display quality deteriorates. Therefore, conventionally, various processes (compensation process) for compensating for variations in the threshold voltage have been proposed.
- Compensation processing methods include an internal compensation method in which compensation processing is performed by providing a capacitor for holding information on the threshold voltage of the drive transistor in the pixel circuit, and for example, the magnitude of the current flowing through the drive transistor under predetermined conditions.
- a pixel circuit 90 including the pixel circuit 90 is known.
- a high-level power supply voltage EL VDD and a low-level power supply voltage ELVSS are given to the pixel circuit 90 as power supply voltages for operation (for driving the organic EL element 91).
- the difference between the high level power supply voltage EL VDD and the low level power supply voltage ELVSS is referred to as "EL power supply voltage”.
- the initialization voltage Vini is applied to the anode terminal of the organic EL element 91 via the thin film transistor T97.
- the voltage value of the initialization voltage Vini and the voltage value of the low level power supply voltage ELVSS are equal to each other. That is, the anode voltage of the organic EL element 91 is initialized based on the low level power supply voltage ELVSS.
- the nodes designated by the reference numerals N1, N2, and N3 in FIG. 17 are referred to as "first node”, “second node”, and “third node”, respectively (the same applies to FIG. 4).
- the third node N3 is directly connected to the anode terminal of the organic EL element 91.
- FIG. 18 shows the waveform of the light emission control signal EM (n) given to the pixel circuit (pixel circuit of the nth row) 90 when black display is performed and the waveform of the voltage V (N3) of the third node N3.
- EM light emission control signal
- the voltage of the second node N2 is initialized (the gate voltage of the thin film transistor T94 as a drive transistor is initialized), and the voltage V (N3) of the third node N3 is initialized (the anode of the organic EL element 91). Initialization of voltage) and writing of the data voltage to the holding capacitor C9 are performed. As can be seen from FIG. 18, during the extinguishing period 901, the voltage V (N3) of the third node N3 drops to a voltage equal to the initialization voltage Vini (low level power supply voltage ELVSS).
- the voltage V (N3) of the third node N3 decreases during the period in which the thin film T97 is turned on in order to initialize the voltage V (N3) of the third node N3 during the extinguishing period 901.
- the waveform is shown in FIG. 18 so that the voltage V (N3) of the third node N3 decreases throughout the extinguishing period 901 (the same applies to FIGS. 12, 16, 19, 20, and 22). ..
- the thin film transistor T96 is turned on, and a current corresponding to the target display gradation flows between the first conduction terminal and the second conduction terminal of the thin film transistor T94.
- the current flowing between the first conductive terminal and the second conductive terminal of the thin film transistor T94 is 0 when the black display is performed, but in reality, the first conductive terminal and the second conductive terminal of the thin film transistor T94 are displayed. Leakage current flows between them. Therefore, as shown in FIG. 18, the voltage V (N3) of the third node N3 gradually increases during the light emission period 902. If the voltage V (N3) of the third node N3 becomes higher than the emission threshold voltage Ve of the organic EL element 91, the organic EL element 91 emits light even though the black display should be performed. A phenomenon called occurs.
- the voltage V (N3) of the third node N3 does not become higher than the emission threshold voltage Ve of the organic EL element 91 (in other words, it is shown in the portion marked with reference numeral 93 in FIG. 18). As described above, the voltage V (N3) of the third node N3 becomes equal to or less than the emission threshold voltage Ve of the organic EL element 91 at the end of the light emission period 902), and the voltage value of the low level power supply voltage ELVSS is set.
- the voltage V (N3) of the third node N3 becomes higher than the light emission threshold voltage Ve of the organic EL element 91 during the light emission period 902. Therefore, when the 120 Hz drive is adopted, the voltage value of the low level power supply voltage ELVSS is set to a lower value than when the 60 Hz drive is adopted. For example, it is assumed that the low level power supply voltage ELVSS is set to a voltage corresponding to the line marked with reference numeral 97 in FIG. 20 when 60 Hz drive is adopted. At this time, the low level power supply voltage ELVSS when 120 Hz drive is adopted is set to a voltage corresponding to, for example, the line marked with reference numeral 98 in FIG.
- the voltage V (N3) of the third node N3 at the end of the light emission period 902 is shown as shown by the portion marked with reference numeral 96 in FIG. ) Is equal to or less than the emission threshold voltage Ve of the organic EL element 91.
- pause drive in which a pause period for stopping the writing operation of the data voltage to the pixel circuit is provided is known.
- the data voltage is written only in one frame period of the continuous plurality of frame periods, and the data voltage is not written in the remaining period. For example, the data voltage is written only in one frame period out of four consecutive frame periods.
- pause drive switching between normal drive (drive that writes data voltage to the pixel circuit every frame period) and pause drive is performed. For example, when the display screen does not change over a predetermined period, the normal drive is switched to the normal drive, and when the user performs some operation or data is sent from the outside, the normal drive is changed to the normal drive. Is switched to. Therefore, for example, as shown in FIG. 21, the normal drive period in which the normal drive is performed and the pause drive period in which the pause drive is performed appear alternately.
- the period during which the data voltage is written to each pixel circuit regardless of whether it is the normal drive period or the pause drive period is referred to as a "data write period", and is included in the pause drive period.
- the period during which the data voltage is not written to each pixel circuit is called the "pause period”.
- the pause drive period is divided into periods corresponding to the length of one frame period during normal drive, the period during which the data voltage is written is called a "refresh frame", and the data voltage is written.
- the period of time is called a "pause frame”.
- the organic EL display device adopts pause drive and the voltage value of the low level power supply voltage ELVSS is set to the same value as the example shown in FIG. 20, the light emission period is shown in the portion marked with reference numeral 99 in FIG. During 902, the voltage V (N3) of the third node N3 may become higher than the emission threshold voltage Ve of the organic EL element 91. Therefore, when the pause drive is adopted, the voltage value of the low level power supply voltage ELVSS is set to a lower value than when the pause drive is not adopted.
- a reference numeral TW is attached to the data writing period
- a reference numeral TP is attached to the pause period
- a reference numeral RF is attached to the refresh frame
- a reference numeral PF is attached to the pause frame.
- Japanese Patent Application Laid-Open No. 2012-58443 describes that the power supply voltage applied to the power supply line is made different in two modes (high voltage output mode and low voltage output mode).
- the frame frequency is set to 1/10 of that in the high voltage output mode.
- the field effect transistor is driven in the saturated region, and in the low voltage output mode, the field effect transistor is driven in the non-saturated region.
- the operation of the drive circuit such as the gate driver and the source driver is stopped throughout the hibernation period. Therefore, the power consumption caused by the operation of the drive circuit is reduced.
- the electric power directly related to the light emission of the organic EL element 91 (hereinafter, referred to as "EL electric power" for convenience) is hardly reduced even if the pause drive is adopted.
- the EL power accounts for most of the power consumed by the entire device. Therefore, it is considered that reducing the EL power leads to an effective reduction in the power consumption of the entire device.
- the EL power supply voltage smaller than the normal drive period during the pause drive period. More specifically, it is considered to set the voltage value of the low level power supply voltage ELVSS during the pause drive period to a value higher than the voltage value of the low level power supply voltage ELVSS during the normal drive period.
- the voltage V (N3) of the third node N3 does not sufficiently decrease during the extinguishing period 901 as described above in the pixel in which the black display is performed. As a result, black floating occurs.
- the following disclosure aims to realize a display device capable of reducing power consumption more than before while preventing the occurrence of black floating.
- the driving method (of the display device) includes a plurality of data signal lines for transmitting a data voltage, a plurality of scanning signal lines intersecting the plurality of data signal lines, and the plurality of scanning signal lines. It is a driving method of a display device including a plurality of light emission control lines intersecting data signal lines and a plurality of pixel circuits including a display element driven by a current and given a high level power supply voltage and a low level power supply voltage. hand, Each pixel circuit The display element having the first terminal and the second terminal to which the low level power supply voltage is applied.
- a drive transistor having a control terminal, a first conduction terminal, and a second conduction terminal and provided in series with the display element, A capacitor whose one end is connected to the control terminal of the drive transistor, A control terminal connected to one of the plurality of light emission control lines, a first conductive terminal connected to the second conductive terminal of the drive transistor, and a second conductive terminal connected to the first terminal of the display element.
- a light emission control transistor having A first initialization having a control terminal connected to one of the plurality of scanning signal lines, a first conduction terminal connected to the control terminal of the drive transistor, and a second conduction terminal to which an initialization voltage is applied.
- the driving method is Normal drive for driving the plurality of data signal lines, the plurality of scanning signal lines, and the plurality of light emission control lines so that the data voltage is written to the capacitor included in each pixel circuit every one frame period. Steps and The data writing period in which the data voltage is written to the capacitor included in each pixel circuit and the pause period in which the data voltage is not written to the capacitor included in each pixel circuit appear alternately.
- a pause drive step for driving the plurality of data signal lines, the plurality of scanning signal lines, and the plurality of emission control lines A low-level power supply voltage rise step that raises the voltage value of the low-level power supply voltage when switching from the normal drive period in which the normal drive step is performed to the pause drive period in which the pause drive step is performed.
- the low-level power supply voltage lowering step of lowering the voltage value of the low-level power supply voltage when switching from the pause drive period to the normal drive period is included.
- the display device is a display device including a display element driven by a current and having a plurality of pixel circuits to which a high level power supply voltage and a low level power supply voltage are applied.
- Multiple data signal lines that transmit data voltage, A plurality of scanning signal lines intersecting the plurality of data signal lines, A plurality of light emission control lines intersecting the plurality of data signal lines, A pixel drive unit that drives the plurality of data signal lines, the plurality of scanning signal lines, and the plurality of emission control lines. It is provided with a low-level power supply voltage output unit that outputs the low-level power supply voltage.
- Each pixel circuit The display element having the first terminal and the second terminal to which the low level power supply voltage is applied.
- a drive transistor having a control terminal, a first conduction terminal, and a second conduction terminal and provided in series with the display element, A capacitor whose one end is connected to the control terminal of the drive transistor, A control terminal connected to one of the plurality of light emission control lines, a first conductive terminal connected to the second conductive terminal of the drive transistor, and a second conductive terminal connected to the first terminal of the display element.
- a light emission control transistor having A first initialization having a control terminal connected to one of the plurality of scanning signal lines, a first conduction terminal connected to the control terminal of the drive transistor, and a second conduction terminal to which an initialization voltage is applied.
- the pixel drive unit During the normal drive period, the plurality of data signal lines, the plurality of scanning signal lines, and the plurality of light emission controls are performed so that the data voltage is written to the capacitor included in each pixel circuit for each frame period.
- Drive the wire and The pause drive period includes a data write period in which the data voltage is written to the capacitor included in each pixel circuit and a pause period in which the data voltage is not written to the capacitor included in each pixel circuit.
- the plurality of data signal lines, the plurality of scanning signal lines, and the plurality of emission control lines are driven so that The low-level power supply voltage output unit outputs the low-level power supply voltage having a voltage value higher than that of the normal drive period during the pause drive period.
- the second initialization transistor is maintained in the ON state in order to initialize the voltage of the first terminal of the display element. 1 terminal initialization period is provided, The first terminal initialization period in the pause drive period is longer than the first terminal initialization period in the normal drive period.
- the voltage value of the low level power supply voltage is set to a value higher than the normal drive period during the pause drive period.
- the low level power supply voltage is applied to the second terminal of the display element (for example, the cathode terminal of the organic EL element).
- the initialization period of the first terminal that applies the initialization voltage to the first terminal of the display element becomes longer than that during the normal drive. That is, the initialization period of the first terminal in the pause drive period becomes longer than before.
- the first display element of the display element is set to the first terminal initialization period in the pixel in which the black display is performed.
- the terminal voltage drops sufficiently. Therefore, in the pixel in which the black display is performed, the voltage of the first terminal of the display element is maintained below the light emission threshold voltage of the display element throughout the period in which the pause drive is performed. Therefore, black floating does not occur.
- the EL power consumed is reduced. From the above, a display device capable of reducing power consumption as compared with the conventional case while preventing the occurrence of black floating is realized.
- FIG. 5 is a signal waveform diagram for explaining how to set a voltage value of a low-level power supply voltage when 60 Hz drive is adopted with respect to a conventional example.
- FIG. 5 is a signal waveform diagram for explaining how to set a voltage value of a low-level power supply voltage when 120 Hz drive is adopted with respect to a conventional example.
- FIG. 5 is a signal waveform diagram for explaining how to set a voltage value of a low-level power supply voltage when 120 Hz drive is adopted with respect to a conventional example. It is a figure for demonstrating the rest drive with respect to a conventional example. It is a signal waveform diagram for demonstrating the method of setting the voltage value of the low level power supply voltage at the time of adopting a hibernation drive with respect to a conventional example.
- i and j are integers of 2 or more
- n is an integer of 1 or more and i or less
- m is an integer of 1 or more and j or less.
- FIG. 2 is a block diagram showing the overall configuration of the organic EL display device according to the present embodiment.
- This organic EL display device is a display device that employs pause drive.
- this organic EL display device includes a display control circuit 100, a display unit 200, a gate driver (scanning signal line drive circuit) 300, an emission driver (light emission control line drive circuit) 400, and a source driver (data signal). It is equipped with a line drive circuit) 500.
- the gate driver 300, the emission driver 400, and the source driver 500 are included in the organic EL display panel 6 having the display unit 200.
- the gate driver 300 and the emission driver 400 are monolithic.
- the source driver 500 may or may not be monolithic.
- the pixel drive unit is realized by the gate driver 300, the emission driver 400, and the source driver 500.
- N-type transistors and P-type transistors are mixed in each pixel circuit 20 in the display unit 200.
- the signal for controlling the N-type transistor is referred to as an "N-type control signal”
- the signal for controlling the P-type transistor is referred to as a "P-type control signal”.
- first scanning signal lines NS (1) to NS (i), i second scanning signal lines PS (1) to PS (i), and i light emitting control lines EM ( 1) to EM (i) and j data signal lines D (1) to D (j) are arranged.
- the inside of the display unit 200 of FIG. 2 is not shown.
- the first scanning signal lines NS (1) to NS (i) are signal lines for transmitting the first scanning signal which is the above-mentioned N-type control signal, and are the second scanning signal lines PS (1) to PS.
- (I) is a signal line for transmitting the second scanning signal which is the P-type control signal described above. The configuration of the pixel circuit 20 will be described later.
- the first scanning signal lines NS (1) to NS (i), the second scanning signal lines PS (1) to PS (i), and the emission control lines EM (1) to EM (i) are typically parallel to each other. It has become.
- the first scanning signal lines NS (1) to NS (i) and the data signal lines D (1) to D (j) are orthogonal to each other.
- the first scanning signals given to the first scanning signal lines NS (1) to NS (i) are also designated by the reference numerals NS (1) to NS (i), and the second scanning signal lines are added.
- the second scanning signals given to the PS (1) to PS (i) are also assigned the reference numerals PS (1) to PS (i), and the light emission control lines EM (1) to EM (i) are given light emission, respectively.
- the codes EM (1) to EM (i) are also attached to the control signals.
- the display unit 200 corresponds to the intersection of i first scanning signal lines NS (1) to NS (i) and j data signal lines D (1) to D (j).
- i ⁇ j pixel circuits 20 are provided. By providing the i ⁇ j pixel circuits 20 in this way, a pixel matrix of i rows ⁇ j columns is formed in the display unit 200.
- the display unit 200 is provided with a power supply line (not shown) common to each pixel circuit 20. More specifically, the power supply line for supplying the low-level power supply voltage ELVSS for driving the organic EL element (hereinafter referred to as “low-level power supply line”) and the high-level power supply voltage EL VDD for driving the organic EL element.
- a power supply line for supplying hereinafter, referred to as “high-level power supply line” and a power supply line for supplying the initialization voltage Vini (hereinafter, referred to as “initialization power supply line”) are arranged.
- the display control circuit 100 receives the input image signal DIN and the timing signal group (horizontal synchronization signal, vertical synchronization signal, etc.) TG sent from the outside, and receives the digital video signal DV and the gate control signal that controls the operation of the gate driver 300.
- the GCTL, the emission driver control signal EMCTL that controls the operation of the emission driver 400, and the source control signal SCTL that controls the operation of the source driver 500 are output.
- the gate control signal GCTL includes a gate start pulse signal, a gate clock signal, and the like.
- the emission driver control signal EMCTL includes an emission start pulse signal, an emission clock signal, and the like.
- the source control signal SCTL includes a source start pulse signal, a source clock signal, a latch strobe signal, and the like.
- the gate driver 300 is connected to the first scanning signal lines NS (1) to NS (i) and the second scanning signal lines PS (1) to PS (i).
- the gate driver 300 applies the first scanning signal to the first scanning signal lines NS (1) to NS (i) based on the gate control signal GCTL output from the display control circuit 100, and the second scanning signal line PS.
- the second scanning signal is applied to (1) to PS (i).
- the high level potential applied to the first scanning signal lines NS (1) to NS (i) is equal to the high level potential applied to the second scanning signal lines PS (1) to PS (i), and the first scanning
- the low-level potential applied to the signal lines NS (1) to NS (i) is equal to the low-level potential applied to the second scanning signal lines PS (1) to PS (i).
- the emission driver 400 is connected to the light emission control lines EM (1) to EM (i).
- the emission driver 400 applies a light emission control signal to the light emission control lines EM (1) to EM (i) based on the emission driver control signal EMCTL output from the display control circuit 100.
- the source driver 500 includes a j-bit shift register, a sampling circuit, a latch circuit, and j D / A converters (not shown).
- the shift register has j registers connected in cascade.
- the shift register sequentially transfers the pulse of the source start pulse signal supplied to the register of the first stage from the input end to the output end based on the source clock signal.
- sampling pulses are output from each stage of the shift register.
- the sampling circuit stores the digital video signal DV.
- the latch circuit captures and holds one line of digital video signal DV stored in the sampling circuit according to the latch strobe signal.
- the D / A converter is provided so as to correspond to each data signal line D (1) to D (j).
- the D / A converter converts the digital video signal DV held in the latch circuit into an analog voltage.
- the converted analog voltage is simultaneously applied to all the data signal lines D (1) to D (j) as a data signal.
- the data signal is applied to the data signal lines D (1) to D (j), the first scanning signal is applied to the first scanning signal lines NS (1) to NS (i), and the second scanning signal line is applied.
- the second scanning signal is applied to the scanning signal lines PS (1) to PS (i), and the light emitting control signal is applied to the light emission control lines EM (1) to EM (i), so that the light emission control signal is based on the input image signal DIN.
- the image is displayed on the display unit 200.
- the power supply circuit 700 includes a high-level power supply voltage output unit 71 and a low-level power supply voltage output unit 72.
- the high level power supply voltage output unit 71 outputs the high level power supply voltage EL VDD.
- the low level power supply voltage output unit 72 outputs the low level power supply voltage ELVSS. At that time, the low-level power supply voltage output unit 72 changes the value of the low-level power supply voltage ELVSS based on the control signal S.
- the low-level power supply voltage output unit 72 outputs a low-level power supply voltage ELVSS having a voltage value higher than that of the normal drive period during the pause drive period. For example, during the normal drive period, a voltage of -5.5 V is output from the low level power supply voltage output unit 72 as a low level power supply voltage ELVSS, and during the pause drive period, a voltage of -4.4 V is low as a low level power supply voltage ELVSS. It is output from the level power supply voltage output unit 72.
- FIG. 4 is a circuit diagram showing the configuration of the pixel circuit 20 in the nth row and the mth column.
- the pixel circuit 20 shown in FIG. 4 includes one organic EL element (organic light emitting diode) 21 as a display element and seven transistors (typically a thin film) T1 to T7 (first initialization transistor T1, threshold value).
- the holding capacitor Ca is a capacitive element composed of two electrodes (first electrode and second electrode).
- the control terminal is connected to the first scanning signal line NS (n-2) on the (n-2) line, the first conduction terminal is connected to the second node N2, and the second The conduction terminal is connected to the initialization power line.
- the control terminal is connected to the first scanning signal line NS (n) on the nth line, and the first conduction terminal is the second conduction terminal of the drive transistor T4 and the first conduction of the light emission control transistor T6. It is connected to the terminal, and the second conduction terminal is connected to the second node N2.
- the control terminal is connected to the second scanning signal line PS (n) in the nth row, the first conduction terminal is connected to the data signal line D (m) in the mth column, and the second conduction terminal is connected.
- the terminal is connected to the first node N1.
- the control terminal is connected to the second node N2, the first conduction terminal is connected to the first node N1, and the second conduction terminal is the first conduction terminal of the threshold voltage compensation transistor T2 and the light emission control transistor T6. It is connected to the first conduction terminal of.
- the control terminal is connected to the light emission control line EM (n) on the nth line
- the first conduction terminal is connected to the high level power supply line and the first electrode of the holding capacitor Ca
- the second The conducting terminal is connected to the first node N1.
- the control terminal is connected to the light emission control line EM (n) on the nth line
- the first conduction terminal is the first conduction terminal of the threshold voltage compensation transistor T2 and the second conduction terminal of the drive transistor T4.
- the second conduction terminal is connected to the third node N3.
- the control terminal is connected to the first scanning signal line NS (n-1) on the (n-1) line, the first conduction terminal is connected to the third node N3, and the second The conduction terminal is connected to the initialization power line.
- the first electrode is connected to the high level power supply line and the first conduction terminal of the power supply control transistor T5, and the second electrode is connected to the second node N2.
- the organic EL element 21 the anode terminal is connected to the third node N3, and the cathode terminal is connected to the low level power supply line.
- FIG. 5 is a timing chart for explaining the operation of the pixel circuit 20 (pixel circuit 20 shown in FIG. 4) on the nth row.
- the period before the time t1 and the period after the time t8 are the light emitting period 83
- the period from the time t1 to t8 is the extinguishing period 82.
- the second scanning signal PS (n) is at a high level
- the NS (n) and the light emission control signal EM (n) are at low levels.
- the power supply control transistor T5 and the light emission control transistor T6 are in the ON state, and the organic EL element 21 emits light according to the magnitude of the drive current.
- the light emission control signal EM (n) changes from low level to high level.
- the power supply control transistor T5 and the light emission control transistor T6 are turned off.
- the supply of the current to the organic EL element 21 is cut off, and the organic EL element 21 is turned off.
- the first scanning signal NS (n-2) changes from a low level to a high level.
- the first initialization transistor T1 is turned on.
- the voltage of the second node N2 (gate voltage of the drive transistor T4) is initialized. That is, the voltage of the second node N2 becomes equal to the initialization voltage Vini.
- the first scanning signal NS (n-1) changes from a low level to a high level.
- the second initialization transistor T7 is turned on.
- the voltage of the third node N3 (the anode voltage of the organic EL element 21) is initialized.
- the first scanning signal NS (n-2) changes from high level to low level.
- the first initialization transistor T1 is turned off.
- the first scanning signal NS (n) changes from a low level to a high level.
- the threshold voltage compensation transistor T2 is turned on.
- the first scanning signal NS (n-1) changes from a high level to a low level.
- the second initialization transistor T7 is turned off.
- the second scanning signal PS (n) changes from a high level to a low level.
- the write control transistor T3 is turned on. Since the threshold voltage compensation transistor T2 is on at time t4, the write control transistor T3 is turned on at time t5, so that the write control transistor T3, the drive transistor T4, and the threshold voltage compensation transistor T2 are turned on.
- the data signal D (m) is given to the second node N2. That is, the data voltage is written to the holding capacitor Ca (charging of the holding capacitor Ca).
- the second scanning signal PS (n) changes from low level to high level.
- the write control transistor T3 is turned off.
- the first scanning signal NS (n) changes from a high level to a low level.
- the threshold voltage compensation transistor T2 is turned off.
- the light emission control signal EM (n) changes from high level to low level.
- the power supply control transistor T5 and the light emission control transistor T6 are turned on, and a drive current corresponding to the charging voltage of the holding capacitor Ca is supplied to the organic EL element 21.
- the organic EL element 21 emits light according to the magnitude of the drive current. After that, the organic EL element 21 emits light throughout the period until the light emission control signal EM (n) changes from a low level to a high level.
- the voltage of the second node N2 is initialized during the period from time t2 to t4, and the voltage of the third node N3 is initialized during the period from time t3 to t5.
- the data voltage is written during the period from time t5 to t6. That is, the extinguishing period 82 includes a period for initializing the voltage of the second node N2, a period for initializing the voltage of the third node N3, and a period for charging the holding capacitor Ca.
- the period during which the voltage of the third node N3 (anode voltage of the organic EL element 21) is initialized (the period from time t3 to t5) is referred to as the “anode initialization period”.
- the first terminal initialization period is realized by this anode initialization period.
- the organic EL display device is a display device that employs pause drive. Therefore, during the operation of the organic EL display device, as shown in FIG. 21, the normal drive period in which the normal drive is performed and the pause drive period in which the pause drive is performed appear alternately.
- a data writing period TW for sequentially writing the data voltage to the pixel circuits 20 from the first row to the i-th row appears for each frame period.
- the period during which the data voltage is actually written to the holding capacitor Ca included in the pixel circuit 20 of each row is represented by shading with reference numerals 81 (FIGS. 1 and 7 to 7). 9 is the same).
- one frame period is 1/120 second. That is, the data writing period TW appears every 1/120 second. In other words, during the normal drive period, both the write frequency and the update frequency are 120 Hz.
- the pause drive period includes, for example, as shown in FIG. 7, a data writing period having a length corresponding to one frame period (1/120 second) during normal drive.
- the TW and the rest period TP having a length corresponding to a three-frame period (1/40 second) during normal driving were alternately repeated.
- one refresh frame RF and three pause frames PF were repeated.
- the writing frequency in the data writing period TW is 120 Hz.
- the update frequency is set to 30 Hz.
- the pause drive period includes a data write period TW having a length corresponding to a two-frame period (1/60 second) during normal drive.
- a rest period TP having a length corresponding to a two-frame period (1/60 second) during driving is alternately repeated.
- the entire screen is rewritten once by two refresh frame RFs included in one data writing period TW. That is, unlike the example shown in FIG. 7, the writing frequency in the data writing period TW is 60 Hz. As described above, the writing frequency is 120 Hz during the normal driving period. Therefore, in the present embodiment, the data voltage is written to the pixel circuit 20 at a lower speed during the data writing period TW during the pause driving period than during the normal driving period. Further, the drive time of the pixel circuit 20 (each period shown in FIG. 5) can be twice as long as the normal drive period during the pause drive period.
- a data writing period TW having a length corresponding to a two-frame period during normal driving and a rest period TP having a length corresponding to a two-frame period during normal driving are alternately repeated (see FIG. 8).
- the length of the data writing period TW and the length of the rest period TP are not limited to this.
- the low level power supply voltage output unit 72 outputs the low level power supply voltage ELVSS having a voltage value higher than that of the normal drive period during the pause drive period. Therefore, when switching from the normal drive period to the pause drive period, the voltage value of the low level power supply voltage ELVSS rises as shown in FIG. On the contrary, when switching from the pause drive period to the normal drive period, the voltage value of the low level power supply voltage ELVSS decreases. From the above, as shown in FIG. 10, the voltage value of the low level power supply voltage ELVSS becomes a relatively low value during the normal drive period and the low level during the pause drive period throughout the period during which the organic EL display device is in operation.
- the voltage value of the power supply voltage ELVSS is a relatively high value.
- the magnitude of the EL power supply voltage during the pause drive period becomes smaller than that during the normal drive period.
- the EL power is proportional to the magnitude of the EL power supply voltage
- the EL power supply is reduced by reducing the EL power supply voltage during the hibernation drive.
- the write frequency in the normal drive period is 120 Hz
- the write frequency in the pause drive period is 60 Hz. In this way, the write frequency is lower during the pause drive period than during the normal drive period.
- the anode initialization period in the dormant drive period becomes longer than the anode initialization period in the normal drive period.
- a step S10 for performing a normal drive a step S20 for switching from a normal drive to a pause drive, a step S30 for performing a pause drive, and a step S30 for performing a pause drive to a normal drive are normal. It can be considered that a series of operations including step S40 for switching to driving are repeated. Regarding this, in step S10, the data signal lines D (1) to D (j) and the first scanning signal line NS are written so that the data voltage is written to the holding capacitor Ca included in each pixel circuit 20 every one frame period.
- step S20 the low level power supply voltage ELVSS
- step S30 the data write period TW in which the data voltage is written to the holding capacitor Ca included in each pixel circuit 20 and the data voltage written to the holding capacitor Ca included in each pixel circuit 20 are written.
- the PS (i) and the light emission control lines EM (1) to EM (i) are driven, and in step S40, the voltage value of the low level power supply voltage ELVSS is lowered.
- the normal drive step is realized by the step S10
- the low level power supply voltage rise step is realized by the step S20
- the pause drive step is realized by the step S30
- the low level power supply voltage lowering step is realized by the step S40. Will be done.
- the high level power supply voltage EL VDD 4.6V
- the high level power supply voltage EL VDD 4.6V
- the EL power for a certain period in the normal drive period is "10.1 x I"
- the voltage value of the low level power supply voltage ELVSS is set to a value higher than the normal drive period during the pause drive period.
- the write frequency is 120 Hz during the normal drive period, whereas the write frequency is 60 Hz during the pause drive period. Therefore, the length of the data writing period TW during the pause drive is a length corresponding to the two-frame period during the normal drive. Therefore, the extinguishing period during the hibernation drive is longer than the extinguishing period during the normal driving. That is, during the dormant drive, the anode initialization period becomes longer than during the normal drive. In other words, the anode initialization period in the dormant drive period is longer than before.
- the voltage V (N3) of the third node N3 is sufficiently lowered during the extinguishing period 82. Therefore, as shown by the portion marked with reference numeral 85 in FIG. 12, the voltage V (N3) of the third node N3 is maintained below the light emission threshold voltage Ve of the organic EL element 21 even at the end of the light emission period 83. .. Therefore, black floating does not occur.
- the lower the writing frequency the longer the anode initialization period. Therefore, as shown in FIG. 13, the lower the writing frequency, the higher the voltage value of the low-level power supply voltage ELVSS. Further, the higher the voltage value of the low level power supply voltage ELVSS, the lower the EL power. Therefore, as shown in FIG. 14, the EL power is reduced as the writing frequency is lowered. In the present embodiment, since the writing frequency in the pause drive period is lower than that in the conventional case, the EL power is reduced as compared with the conventional case.
- FIG. 15 is a diagram comparing the power consumption of the normal drive, the conventional pause drive, and the pause drive of the present embodiment.
- the analog power and the logic power are reduced as compared with the normal drive.
- the EL power is hardly reduced.
- the hibernate drive of the present embodiment the EL power is reduced as compared with the normal drive in addition to the analog power and the logic power. As described above, according to the present embodiment, it is possible to reduce the EL power that occupies most of the power consumed by the entire device.
- an organic EL display device capable of reducing power consumption as compared with the conventional case while preventing the occurrence of black floating is realized.
- the data writing period TW is longer during the pause drive than during the normal drive.
- the data voltage corresponding to black is regarded as a relatively high voltage, and the data voltage corresponding to white is compared. Where the voltage is low, if the period for writing the data voltage is long, the data voltage corresponding to black can be set to a lower voltage than the original voltage.
- the high level voltage (high level voltage of the first scanning signal) applied to the control terminal of the threshold voltage compensation transistor T2 when writing the data voltage is set to be lower than the original voltage. It can be set to a low voltage.
- the voltage value of the low level power supply voltage ELVSS is set to a value higher than the normal drive period, and in addition, the driver (gate driver 300, emission driver 400)
- the voltage value of the high level power supply voltage DVDD is set to a value lower than the normal drive period.
- the driver's high-level power supply voltage DVDD and the driver's low-level power supply voltage DVSS are set as follows.
- the driver's high-level power supply voltage DVDD and the driver's low-level power supply voltage DVSS are set as follows.
- the driver's high-level power supply voltage DVDD corresponds to the first power supply voltage
- the driver's low-level power supply voltage DVSS corresponds to the second power supply voltage
- the writing frequency is set lower in the pause driving period than in the normal driving period.
- the write frequency can be the same in the normal drive period and the pause drive period. This will be described below.
- FIG. 16 is a signal waveform diagram for explaining the driving method in this modified example. Also in this modification, the anode initialization period in the dormant drive period is made longer than the anode initialization period in the normal drive period. Then, the data writing period TW is made longer than the original and the rest period TP is made shorter than the original by the period corresponding to the extension. More specifically, if the difference between the anode initialization period in the pause drive period and the anode initialization period in the normal drive period is defined as the "initialization extension period", the initialization extension period ⁇ T is added to the one frame period in the normal drive period.
- the dormant drive is performed so that the dormant period TP consisting of the period corresponding to (N is 2) appears alternately.
- the anode initialization period in the pause drive period is longer than before.
- the voltage value of the low-level power supply voltage ELVSS during the hibernation drive is set to a value higher than the voltage value of the low-level power supply voltage ELVSS during the normal drive
- the pixel in which the black display is performed has a pause drive period.
- the voltage V (N3) of the third node N3 drops sufficiently during the extinguishing period 82. Therefore, the voltage V (N3) of the third node N3 is maintained below the light emission threshold voltage Ve of the organic EL element 21 even at the end of the light emission period 83 of the pause drive period. Therefore, black floating does not occur.
- the writing frequency of the data voltage is the same in the normal driving period and the pause driving period, it is possible to reduce the power consumption as compared with the conventional case while preventing the occurrence of black floating.
- the organic EL display device has been described as an example, but the present invention is not limited to this, and the present invention can be applied to an inorganic EL display device, a QLED display device, and the like.
- the initialization voltage Vini is set so that the voltage V (N3) of the third node N3 does not exceed the light emission threshold voltage Ve of the organic EL element 21 at the end of the light emission period 83 (see FIG. 12) of the pause drive period.
- the voltage value of the low-level power supply voltage ELVSS during hibernation drive is set to a value higher than the voltage value of the low-level power supply voltage ELVSS during normal drive, as described above. The effect of power reduction can be obtained.
- Organic EL display panel 20 Pixel circuit 21 ... Organic EL element 72 ... Low level power supply voltage output unit 200 ... Display units N1 to N3 ... 1st to 3rd nodes T1 ... 1st initialization transistor T2 ... Threshold voltage compensation transistor T3 ... Write control transistor T4 ... Drive transistor T5 ... Power supply control transistor T6 ... Light emission control transistor T7 ... Second initialization transistor EL VDD ... High level power supply voltage ELVSS ... Low level power supply voltage Vini ... Initialization voltage TP ... Pause period TW ... Data write period RF ... Refresh frame PF ... Pause frame
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Abstract
Description
各画素回路は、
第1端子と、前記ローレベル電源電圧が与えられる第2端子とを有する前記表示素子と、
制御端子と第1導通端子と第2導通端子とを有し、前記表示素子と直列に設けられた駆動トランジスタと、
一端が前記駆動トランジスタの制御端子に接続されたキャパシタと、
前記複数の発光制御線の1つに接続された制御端子と、前記駆動トランジスタの第2導通端子に接続された第1導通端子と、前記表示素子の第1端子に接続された第2導通端子とを有する発光制御トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記駆動トランジスタの制御端子に接続された第1導通端子と、初期化電圧が与えられる第2導通端子とを有する第1初期化トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記表示素子の第1端子に接続された第1導通端子と、前記初期化電圧が与えられる第2導通端子とを有する第2初期化トランジスタと
を含み、
前記駆動方法は、
各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが1フレーム期間毎に行われるよう前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動する通常駆動ステップと、
各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われるデータ書き込み期間と各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われない休止期間とが交互に現れるよう前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動する休止駆動ステップと、
前記通常駆動ステップが行われる通常駆動期間から前記休止駆動ステップが行われる休止駆動期間に切り替わる際に前記ローレベル電源電圧の電圧値を上昇させるローレベル電源電圧上昇ステップと、
前記休止駆動期間から前記通常駆動期間に切り替わる際に前記ローレベル電源電圧の電圧値を低下させるローレベル電源電圧低下ステップと
を含み、
各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われる際には、前記表示素子の第1端子の電圧を初期化するために前記第2初期化トランジスタをオン状態で維持する第1端子初期化期間が設けられ、
前記休止駆動期間における前記第1端子初期化期間は、前記通常駆動期間における前記第1端子初期化期間よりも長い。
データ電圧を伝達する複数のデータ信号線と、
前記複数のデータ信号線に交差する複数の走査信号線と、
前記複数のデータ信号線に交差する複数の発光制御線と、
前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動する画素駆動部と、
前記ローレベル電源電圧を出力するローレベル電源電圧出力部と
を備え、
各画素回路は、
第1端子と、前記ローレベル電源電圧が与えられる第2端子とを有する前記表示素子と、
制御端子と第1導通端子と第2導通端子とを有し、前記表示素子と直列に設けられた駆動トランジスタと、
一端が前記駆動トランジスタの制御端子に接続されたキャパシタと、
前記複数の発光制御線の1つに接続された制御端子と、前記駆動トランジスタの第2導通端子に接続された第1導通端子と、前記表示素子の第1端子に接続された第2導通端子とを有する発光制御トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記駆動トランジスタの制御端子に接続された第1導通端子と、初期化電圧が与えられる第2導通端子とを有する第1初期化トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記表示素子の第1端子に接続された第1導通端子と、前記初期化電圧が与えられる第2導通端子とを有する第2初期化トランジスタと
を含み、
前記画素駆動部は、
通常駆動期間には、各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが1フレーム期間毎に行われるよう、前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動し、
休止駆動期間には、各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われるデータ書き込み期間と各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われない休止期間とが交互に現れるよう、前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動し、
前記ローレベル電源電圧出力部は、前記休止駆動期間には前記通常駆動期間よりも高い電圧値の前記ローレベル電源電圧を出力し、
各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われる際には、前記表示素子の第1端子の電圧を初期化するために前記第2初期化トランジスタをオン状態で維持する第1端子初期化期間が設けられ、
前記休止駆動期間における前記第1端子初期化期間は、前記通常駆動期間における前記第1端子初期化期間よりも長い。
図2は、本実施形態に係る有機EL表示装置の全体構成を示すブロック図である。この有機EL表示装置は、休止駆動を採用する表示装置である。図2に示すように、この有機EL表示装置は、表示制御回路100と表示部200とゲートドライバ(走査信号線駆動回路)300とエミッションドライバ(発光制御線駆動回路)400とソースドライバ(データ信号線駆動回路)500とを備えている。表示部200を有する有機EL表示パネル6内にゲートドライバ300とエミッションドライバ400とソースドライバ500とが含まれている。典型的には、ゲートドライバ300とエミッションドライバ400とはモノリシック化されている。ソースドライバ500については、モノリシック化されていても良いし、モノリシック化されていなくても良い。なお、ゲートドライバ300とエミッションドライバ400とソースドライバ500とによって画素駆動部が実現される。
<2.1 画素回路の構成>
表示部200内の画素回路20の構成について説明する。なお、ここで示す画素回路20の構成は一例であって、これには限定されない。図4は、第n行第m列の画素回路20の構成を示す回路図である。図4に示す画素回路20は、表示素子としての1個の有機EL素子(有機発光ダイオード)21と、7個のトランジスタ(典型的には薄膜トランジスタ)T1~T7(第1初期化トランジスタT1、閾値電圧補償トランジスタT2、書き込み制御トランジスタT3、駆動トランジスタT4、電源供給制御トランジスタT5、発光制御トランジスタT6、第2初期化トランジスタT7)と、1個の保持キャパシタCaとを含んでいる。トランジスタT1,T2,およびT7は、N型トランジスタである。トランジスタT3~T6は、P型トランジスタである。このように、この画素回路20にはN型トランジスタとP型トランジスタとが混在している。チャネル層の材料の観点では、トランジスタT1,T2,およびT7は例えばIGZO-TFTであって、トランジスタT3~T6は例えばLTPS-TFTである。但し、これには限定されない。保持キャパシタCaは、2つの電極(第1電極および第2電極)からなる容量素子である。
次に、画素回路20の動作について説明する。図5は、n行目の画素回路20(図4に示す画素回路20)の動作について説明するためのタイミングチャートである。図5に関し、時刻t1以前の期間および時刻t8以降の期間が発光期間83であり、時刻t1~t8の期間が消灯期間82である。
以下、本実施形態における駆動方法について説明する。上述したように、本実施形態に係る有機EL表示装置は、休止駆動を採用する表示装置である。従って、有機EL表示装置の動作中、図21に示したように、通常駆動が行われる通常駆動期間と休止駆動が行われる休止駆動期間とが交互に現れる
図6に示すように、通常駆動期間には、1行目からi行目までの画素回路20に対して順次にデータ電圧の書き込みを行うためのデータ書き込み期間TWが1フレーム期間毎に現れる。なお、図6では、各行の画素回路20に含まれる保持キャパシタCaに対して実際にデータ電圧の書き込みが行われる期間を符号81を付した網掛けで表している(図1および図7~図9も同様)。本実施形態においては、1フレーム期間は120分の1秒である。すなわち、120分の1秒毎にデータ書き込み期間TWが現れる。換言すれば、通常駆動期間には、書き込み周波数も更新周波数も120Hzとなる。
休止駆動を採用する従来の有機EL表示装置では、休止駆動期間には、例えば図7に示すように、通常駆動中の1フレーム期間(120分の1秒)に相当する長さのデータ書き込み期間TWと通常駆動中の3フレーム期間(40分の1秒)に相当する長さの休止期間TPとが交互に繰り返されていた。換言すれば、1回のリフレッシュフレームRFと3回の休止フレームPFとが繰り返されていた。図7に示す例では、データ書き込み期間TWにおける書き込み周波数は120Hzとなっている。このようなデータ書き込み期間TWの後に3フレーム期間に相当する長さの休止期間TPを設けることによって、更新周波数は30Hzとなっている。
次に、通常駆動と休止駆動との切り替えが行われる際の動作について説明する。休止駆動を採用する従来の有機EL表示装置においては、図9に示すように、通常駆動期間から休止駆動期間に切り替わってもハイレベル電源電圧ELVDDの電圧値およびローレベル電源電圧ELVSSの電圧値に変化はない。休止駆動期間から通常駆動期間に切り替わる際も同様である。以上のように、休止駆動を採用する従来の有機EL表示装置においては、休止駆動期間と通常駆動期間とでEL電源電圧の大きさは同じである。
EL電力低減の具体例について説明する。
ELVDD=4.6V
ELVSS=-5.5V
Vini=-5.5V
ELVDD=4.6V
ELVSS=-4.4V
Vini=-4.4V
P=(ELVDD-ELVSS)×I ・・・(1)
((10.1-9.0)/10.1)×100=10.89 ・・・(2)
本実施形態によれば、休止駆動期間にはローレベル電源電圧ELVSSの電圧値が通常駆動期間よりも高い値に設定される。また、通常駆動期間には書き込み周波数が120Hzとなるのに対して、休止駆動期間には書き込み周波数は60Hzとなる。従って、休止駆動中のデータ書き込み期間TWの長さは、通常駆動中の2フレーム期間に相当する長さとなる。それ故、休止駆動中の消灯期間は、通常駆動中の消灯期間よりも長くなる。すなわち、休止駆動中には、アノード初期化期間が通常駆動中よりも長くなる。換言すれば、休止駆動期間におけるアノード初期化期間が従来よりも長くなる。その結果、休止駆動期間には、ローレベル電源電圧ELVSSの電圧値が通常駆動期間よりも高い値に設定されていても、黒表示が行われる画素において図12で符号84を付した部分に示すように消灯期間82中に第3ノードN3の電圧V(N3)が充分に低下する。それ故、図12で符号85を付した部分に示すように、発光期間83の終了時点においても第3ノードN3の電圧V(N3)は有機EL素子21の発光閾値電圧Ve以下で維持される。従って、黒浮きは発生しない。
以下、上記実施形態の変形例を説明する。
上記実施形態によれば、データ書き込み期間TWが通常駆動中よりも休止駆動中の方が長くなる。図4に示す構成の画素回路20が採用されている場合(駆動トランジスタT4がP型トランジスタである場合)には黒色に対応するデータ電圧は比較的高い電圧とされ白色に対応するデータ電圧は比較的低い電圧とされるところ、データ電圧の書き込みを行う期間が長くなると、黒色に対応するデータ電圧を本来よりも低い電圧に設定することが可能となる。黒色に対応するデータ電圧を本来よりも低い電圧に設定した場合、データ電圧の書き込み時に閾値電圧補償トランジスタT2の制御端子に印加するハイレベル電圧(第1走査信号のハイレベル電圧)を本来よりも低い電圧に設定することができる。
DVDD=6.5V
DVSS=-8.0V
DVDD=6.0V
DVSS=-8.0V
((14.52-14.02)/14.52)×100=6.78 ・・・(3)
上記実施形態においては、黒浮きの発生を防止するために、書き込み周波数が休止駆動期間には通常駆動期間よりも低くされていた。しかしながら、通常駆動期間と休止駆動期間とで書き込み周波数を同じにすることもできる。これについて、以下に説明する。
上記実施形態(変形例を含む)では有機EL表示装置を例に挙げて説明したが、これには限定されず、無機EL表示装置、QLED表示装置などにも本発明を適用することができる。
20…画素回路
21…有機EL素子
72…ローレベル電源電圧出力部
200…表示部
N1~N3…第1~第3ノード
T1…第1初期化トランジスタ
T2…閾値電圧補償トランジスタ
T3…書き込み制御トランジスタ
T4…駆動トランジスタ
T5…電源供給制御トランジスタ
T6…発光制御トランジスタ
T7…第2初期化トランジスタ
ELVDD…ハイレベル電源電圧
ELVSS…ローレベル電源電圧
Vini…初期化電圧
TP…休止期間
TW…データ書き込み期間
RF…リフレッシュフレーム
PF…休止フレーム
Claims (11)
- データ電圧を伝達する複数のデータ信号線と、前記複数のデータ信号線に交差する複数の走査信号線と、前記複数のデータ信号線に交差する複数の発光制御線と、電流によって駆動される表示素子を含みハイレベル電源電圧とローレベル電源電圧とが与えられる複数の画素回路とを備えた表示装置の駆動方法であって、
各画素回路は、
第1端子と、前記ローレベル電源電圧が与えられる第2端子とを有する前記表示素子と、
制御端子と第1導通端子と第2導通端子とを有し、前記表示素子と直列に設けられた駆動トランジスタと、
一端が前記駆動トランジスタの制御端子に接続されたキャパシタと、
前記複数の発光制御線の1つに接続された制御端子と、前記駆動トランジスタの第2導通端子に接続された第1導通端子と、前記表示素子の第1端子に接続された第2導通端子とを有する発光制御トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記駆動トランジスタの制御端子に接続された第1導通端子と、初期化電圧が与えられる第2導通端子とを有する第1初期化トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記表示素子の第1端子に接続された第1導通端子と、前記初期化電圧が与えられる第2導通端子とを有する第2初期化トランジスタと
を含み、
前記駆動方法は、
各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが1フレーム期間毎に行われるよう前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動する通常駆動ステップと、
各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われるデータ書き込み期間と各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われない休止期間とが交互に現れるよう前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動する休止駆動ステップと、
前記通常駆動ステップが行われる通常駆動期間から前記休止駆動ステップが行われる休止駆動期間に切り替わる際に前記ローレベル電源電圧の電圧値を上昇させるローレベル電源電圧上昇ステップと、
前記休止駆動期間から前記通常駆動期間に切り替わる際に前記ローレベル電源電圧の電圧値を低下させるローレベル電源電圧低下ステップと
を含み、
各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われる際には、前記表示素子の第1端子の電圧を初期化するために前記第2初期化トランジスタをオン状態で維持する第1端子初期化期間が設けられ、
前記休止駆動期間における前記第1端子初期化期間は、前記通常駆動期間における前記第1端子初期化期間よりも長いことを特徴とする、駆動方法。 - 前記休止駆動期間に各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みを行う際の書き込み周波数は、前記通常駆動期間に各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みを行う際の書き込み周波数よりも低いことを特徴とする、請求項1に記載の駆動方法。
- 前記休止駆動期間における前記データ書き込み期間は、前記通常駆動期間における前記データ書き込み期間の2倍の長さであることを特徴とする、請求項2に記載の駆動方法。
- 前記通常駆動期間に各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われる際の書き込み周波数と前記休止駆動期間に各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われる際の書き込み周波数とは同じであって、
前記休止駆動ステップでは、前記休止駆動期間における前記第1端子初期化期間と前記通常駆動期間における前記第1端子初期化期間との差である初期化延長期間を前記通常駆動期間における1フレーム期間に加えた長さの前記データ書き込み期間と、前記通常駆動期間における1フレーム期間から前記初期化延長期間を減じた長さの期間とNを整数として前記通常駆動期間におけるNフレーム期間に相当する長さの期間とからなる前記休止期間とが交互に現れることを特徴とする、請求項1に記載の駆動方法。 - 前記初期化電圧の電圧値と前記ローレベル電源電圧の電圧値とは等しい値に設定されていることを特徴とする、請求項1から4までのいずれか1項に記載の駆動方法。
- 前記表示装置は、前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動する画素駆動部を備え、
黒色に対応する前記データ電圧の電圧値は、白色に対応する前記データ電圧の電圧値よりも高い値に設定され、かつ、前記休止駆動期間には前記通常駆動期間よりも低い値に設定され、
前記画素駆動部の動作用の電源電圧として、前記画素駆動部にはハイレベルの第1電源電圧とローレベルの第2電源電圧とが与えられ、
前記第1電源電圧の電圧値は、前記休止駆動期間には前記通常駆動期間よりも低い値に設定されることを特徴とする、請求項1から5までのいずれか1項に記載の駆動方法。 - 前記第1端子初期化期間は、前記発光制御トランジスタをオフ状態で維持する消灯期間の一部の期間であることを特徴とする、請求項1から6までのいずれか1項に記載の駆動方法。
- 電流によって駆動される表示素子を含みハイレベル電源電圧とローレベル電源電圧とが与えられる複数の画素回路を備えた表示装置であって、
データ電圧を伝達する複数のデータ信号線と、
前記複数のデータ信号線に交差する複数の走査信号線と、
前記複数のデータ信号線に交差する複数の発光制御線と、
前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動する画素駆動部と、
前記ローレベル電源電圧を出力するローレベル電源電圧出力部と
を備え、
各画素回路は、
第1端子と、前記ローレベル電源電圧が与えられる第2端子とを有する前記表示素子と、
制御端子と第1導通端子と第2導通端子とを有し、前記表示素子と直列に設けられた駆動トランジスタと、
一端が前記駆動トランジスタの制御端子に接続されたキャパシタと、
前記複数の発光制御線の1つに接続された制御端子と、前記駆動トランジスタの第2導通端子に接続された第1導通端子と、前記表示素子の第1端子に接続された第2導通端子とを有する発光制御トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記駆動トランジスタの制御端子に接続された第1導通端子と、初期化電圧が与えられる第2導通端子とを有する第1初期化トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記表示素子の第1端子に接続された第1導通端子と、前記初期化電圧が与えられる第2導通端子とを有する第2初期化トランジスタと
を含み、
前記画素駆動部は、
通常駆動期間には、各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが1フレーム期間毎に行われるよう、前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動し、
休止駆動期間には、各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われるデータ書き込み期間と各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われない休止期間とが交互に現れるよう、前記複数のデータ信号線と前記複数の走査信号線と前記複数の発光制御線とを駆動し、
前記ローレベル電源電圧出力部は、前記休止駆動期間には前記通常駆動期間よりも高い電圧値の前記ローレベル電源電圧を出力し、
各画素回路に含まれる前記キャパシタへの前記データ電圧の書き込みが行われる際には、前記表示素子の第1端子の電圧を初期化するために前記第2初期化トランジスタをオン状態で維持する第1端子初期化期間が設けられ、
前記休止駆動期間における前記第1端子初期化期間は、前記通常駆動期間における前記第1端子初期化期間よりも長いことを特徴とする、表示装置。 - 各画素回路は、
前記複数の走査信号線の1つに接続された制御端子と、前記複数のデータ信号線の1つに接続された第1導通端子と、前記駆動トランジスタの第1導通端子に接続された第2導通端子とを有する書き込み制御トランジスタと、
前記複数の走査信号線の1つに接続された制御端子と、前記駆動トランジスタの第2導通端子に接続された第1導通端子と、前記駆動トランジスタの制御端子に接続された第2導通端子とを有する閾値電圧補償トランジスタと、
前記複数の発光制御線の1つに接続された制御端子と、前記ハイレベル電源電圧が与えられる第1導通端子と、前記駆動トランジスタの第1導通端子に接続された第2導通端子とを有する電源供給制御トランジスタと
を更に含むことを特徴とする、請求項8に記載の表示装置。 - 前記第1初期化トランジスタと前記第2初期化トランジスタと前記閾値電圧補償トランジスタとは、酸化物半導体によりチャネル層が形成された薄膜トランジスタであって、
前記駆動トランジスタと前記発光制御トランジスタと前記書き込み制御トランジスタと前記電源供給制御トランジスタとは、低温ポリシリコンによりチャネル層が形成された薄膜トランジスタであって、
前記複数の走査信号線は、複数の第1走査信号線と複数の第2走査信号線とからなり、
前記閾値電圧補償トランジスタの制御端子は、前記複数の第1走査信号線の1つに接続され、
前記書き込み制御トランジスタの制御端子は、前記複数の第2走査信号線の1つに接続され、
前記第1初期化トランジスタの制御端子は、前記複数の第1走査信号線の1つに接続され、
前記第2初期化トランジスタの制御端子は、前記複数の第1走査信号線の1つに接続されていることを特徴とする、請求項9に記載の表示装置。 - 前記初期化電圧の電圧値と前記ローレベル電源電圧の電圧値とは等しい値に設定され、
前記ローレベル電源電圧出力部から出力された前記ローレベル電源電圧が前記初期化電圧として前記第2初期化トランジスタの第2導通端子に与えられることを特徴とする、請求項8から10までのいずれか1項に記載の表示装置。
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US20190340977A1 (en) * | 2018-05-03 | 2019-11-07 | Samsung Display Co., Ltd. | Display apparatus and method of driving display panel using the same |
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