WO2010041426A1 - 画像表示装置およびその制御方法 - Google Patents
画像表示装置およびその制御方法 Download PDFInfo
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- WO2010041426A1 WO2010041426A1 PCT/JP2009/005181 JP2009005181W WO2010041426A1 WO 2010041426 A1 WO2010041426 A1 WO 2010041426A1 JP 2009005181 W JP2009005181 W JP 2009005181W WO 2010041426 A1 WO2010041426 A1 WO 2010041426A1
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- light emitting
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—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
- 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]
- 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
- G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
- G09G2300/0852—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor being a dynamic memory with more than one capacitor
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
- G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0262—The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
Definitions
- the present invention relates to an image display device and a control method thereof, and more particularly to an image display device using a current-driven light emitting element and a control method thereof.
- An image display apparatus using an organic electroluminescence (EL) element is known as an image display apparatus using a current drive type light emitting element.
- the organic EL display device using the organic EL element that emits light by itself does not require a backlight necessary for the liquid crystal display device, and is optimal for thinning the device. Moreover, since there is no restriction
- organic EL elements constituting pixels are usually arranged in a matrix.
- An organic EL element is provided at the intersection of a plurality of row electrodes (scanning lines) and a plurality of column electrodes (data lines), and a voltage corresponding to a data signal is applied between the selected row electrodes and the plurality of column electrodes.
- What drives an organic EL element is called a passive matrix type organic EL display.
- a switching thin film transistor (TFT: Thin Film Transistor) is provided at the intersection of a plurality of scanning lines and a plurality of data lines, the gate of the driving element is connected to this switching TFT, and this switching TFT is turned on through the selected scanning line.
- a data signal is input to the drive element from the signal line.
- a device that drives an organic EL element by this drive element is called an active matrix organic EL display device.
- the active matrix type organic EL display device Unlike the passive matrix type organic EL display device in which the organic EL elements connected thereto emit light only during a period in which each row electrode (scanning line) is selected, the next scanning (an active matrix type organic EL display device) Since it is possible to cause the organic EL element to emit light up to (selected), the increase in the number of scanning lines does not cause a decrease in the brightness of the display. Therefore, the active matrix organic EL display device can be driven at a low voltage, and power consumption can be reduced.
- Patent Document 1 discloses a circuit configuration of a pixel portion in an active matrix organic EL display device.
- FIG. 16 is a circuit configuration diagram of a pixel portion in the conventional organic EL display device described in Patent Document 1.
- the cathode is connected to a negative power supply line (voltage value is VEE)
- the drain is connected to a positive power supply line (voltage value is VDD)
- the source is an anode of the organic EL element 505 N-type thin film transistor (n-type TFT) 504 connected to the capacitor 503, a capacitive element 503 connected between the gate and source of the n-type TFT 504 and holding the gate voltage of the n-type TFT 504, and substantially the same potential between both terminals of the organic EL element 505
- a third switching element 509, a first switching element 501 selectively applying a video signal to the gate of the n-type TFT 504 from the signal line 506, and a second switching element initializing the gate potential of the n-type TFT 504 to a predetermined potential It consists of a simple circuit element 502.
- the second switching element 502 is turned on by the scanning signal supplied from the second scanning line 508, and a predetermined voltage VREF supplied from the reference power supply line is applied to the gate of the n-type TFT 504 to The n-type TFT 504 is initialized so that the current between the source and the drain does not flow (S101).
- the second switching element 502 is turned off by the scanning signal supplied from the second scanning line 508 (S102).
- the first switching element 501 is turned on by the scanning signal supplied from the first scanning line 507, and the signal voltage supplied from the signal line 506 is applied to the gate of the n-type TFT 504 (S103).
- the first scanning line 507 is connected to the gate of the third switching element 509, and the gate of the third switching element 509 is turned on simultaneously with the conduction of the first switching element 501.
- charges corresponding to the signal voltage are accumulated in the capacitive element 503 without being influenced by the voltage between the terminals of the organic EL element 505.
- the third switching element 509 is conductive, no current flows in the organic EL element 505, so the organic EL element 505 does not emit light.
- the third switching element 509 is turned off by the scanning signal supplied from the first scanning line 507, and a signal current corresponding to the charge stored in the capacitive element 503 is supplied from the n-type TFT 504 to the organic EL element 505. (S104). At this time, the organic EL element 505 emits light.
- the organic EL element 505 emits light at a luminance corresponding to the signal voltage supplied from the signal line in one frame period.
- both end electrodes of a capacitive element having a function of holding the voltage between the gate and source of the driving n-type TFT It becomes difficult to record an accurate potential. Therefore, since the accurate signal current corresponding to the signal voltage does not flow, the light emitting element does not emit light correctly, and as a result, high-accuracy image display reflecting the video signal is not performed.
- an accurate potential corresponding to a signal voltage is recorded on both end electrodes of an electrostatic holding capacitance that holds a voltage between the gate and the source of an n-type drive TFT with a simple pixel circuit. It is an object of the present invention to provide an image display apparatus having light emitting pixels capable of
- a light emitting element a capacitor for holding a voltage
- a gate electrode is connected to a first electrode of the capacitor
- a source electrode is the light emitting element
- a driving element for causing the light emitting element to emit light by causing a drain current according to the voltage held by the capacitor to flow to the light emitting element, and to determine the potential of the drain electrode of the driving element.
- a first switching element for setting the reference voltage to the first electrode of the capacitor, a data line for supplying a signal voltage to the second electrode of the capacitor, and one terminal for the data line A second switching element which is electrically connected, the other terminal of which is electrically connected to the second electrode of the capacitor, and which switches between conduction and non-conduction between the data line and the second electrode of the capacitor;
- a third switching element for connecting the first electrode of the first electrode to the second electrode of the capacitor; and a driving circuit for controlling the first switching element, the second switching element, and the third switching element,
- the drive circuit turns on the first switching element and the second switching element while the third switching element is turned off to hold the voltage corresponding to the signal voltage in the capacitor, and the signal voltage Before the first switching element and the second switching element are turned off. Characterized by turning ON the third switching element.
- the current flowing to the driving n-type TFT is always only via the light emitting element, and therefore does not flow to the reference power supply line and the signal line. Therefore, an accurate potential can be recorded on both end electrodes of the capacitive element having a function of holding the voltage between the gate and the source of the driving n-type TFT, and a highly accurate image display reflecting the video signal can be performed. It becomes possible.
- FIG. 1 is a block diagram showing the electrical configuration of the image display apparatus of the present invention.
- FIG. 2 is a diagram showing a circuit configuration of a light emitting pixel included in the display unit according to Embodiment 1 of the present invention and connection with peripheral circuits thereof.
- FIG. 3A is an operation timing chart of the control method of the image display device according to Embodiments 1 and 2 of the present invention.
- FIG. 3B is an operation timing chart showing a modified example of the control method of the image display device according to Embodiments 1 and 2 of the present invention.
- FIG. 4 is an operation flowchart of the image display device according to the first embodiment of the present invention.
- FIG. 1 is a block diagram showing the electrical configuration of the image display apparatus of the present invention.
- FIG. 2 is a diagram showing a circuit configuration of a light emitting pixel included in the display unit according to Embodiment 1 of the present invention and connection with peripheral circuits thereof.
- FIG. 3A is an operation timing chart of the control method of the
- FIG. 5A is a diagram showing a conductive state of the pixel circuit at the time of signal voltage writing in the image display device according to Embodiment 1 of the present invention.
- FIG. 5B is a diagram showing a conductive state of the pixel circuit at the time of light emission of the image display device according to Embodiment 1 of the present invention.
- FIG. 6 is a diagram showing a circuit configuration of a light emitting pixel included in a display unit according to Embodiment 2 of the present invention and connection thereof with peripheral circuits.
- FIG. 7 is an operation flowchart of the image display device according to the second embodiment of the present invention.
- FIG. 8 is a diagram showing a circuit configuration of a light emitting pixel included in a display unit according to Embodiment 3 of the present invention and connection with peripheral circuits thereof.
- FIG. 9 is an operation timing chart of the control method of the image display device according to the third embodiment of the present invention.
- FIG. 10 is an operation flowchart of the image display device according to the third embodiment of the present invention.
- FIG. 11 is a diagram showing a circuit configuration showing a modification of a light emitting pixel in a display unit according to Embodiment 3 of the present invention and a connection with its peripheral circuit.
- FIG. 12 is an operation timing chart showing a modification of the method of controlling light emitting pixels in the image display device according to Embodiment 3 of the present invention.
- FIG. 13 is an operation flowchart showing a modification of the luminescent pixel of the image display device according to Embodiment 3 of the present invention.
- FIG. 14 is a diagram showing a circuit configuration of a light emitting pixel in which the second and third embodiments of the present invention are combined and a connection with the peripheral circuit thereof.
- FIG. 15 is an external view of a thin flat TV incorporating the image display device of the present invention.
- FIG. 16 is a circuit configuration diagram of a pixel portion in the conventional organic EL display device described in Patent Document 1. As shown in FIG.
- the light emitting element, the capacitor for holding a voltage, and the gate electrode are connected to the first electrode of the capacitor, and the source electrode is connected to the first electrode of the light emitting element.
- a second power supply line electrically connected to the second electrode of the light emitting element; a third power supply line supplying a reference voltage for defining a voltage value of the first electrode of the capacitor; and a first electrode of the capacitor
- a second switching element electrically connected to the second electrode of the capacitor and switching between conduction and non-conduction between the data line and the second electrode of the capacitor, a
- a third switching element for connecting the first electrode of the light emitting element and a node between the second electrode of the capacitor and the second switching element is provided, and the third switching element is turned off.
- a voltage corresponding to the signal voltage is held in the capacitor, and after the voltage corresponding to the signal voltage is held in the capacitor, the third switching element is turned on.
- the voltage corresponding to the signal voltage can be set to the capacitor while the source electrode of the drive element and the second electrode of the capacitor are not connected. That is, the current can be prevented from flowing from the source electrode of the drive transistor to the capacitor before the voltage corresponding to the signal voltage is completely held in the capacitor.
- the voltage corresponding to the signal voltage can be accurately held in the capacitor, the voltage to be held in the capacitor fluctuates, and the light emitting element does not accurately emit light with the light emission amount reflecting the video signal. It can prevent. As a result, it is possible to accurately cause the light emitting element to emit light with the amount of light emission reflecting the video signal, and to realize highly accurate image display reflecting the video signal.
- the image display apparatus is the image display apparatus according to the first aspect, wherein the first electrode of the light emitting element is an anode electrode, and the second electrode of the light emitting element is a cathode electrode.
- the voltage of the first power supply line is higher than the voltage of the second power supply line, and a current flows from the first power supply line toward the second power supply line.
- the drive element is configured by an N-type transistor.
- An image display apparatus is the image display apparatus according to the first or second aspect, further comprising: a signal for connecting the first switching element and the drive circuit and controlling the first switching element.
- a second scanning line connecting a first scanning line transmitted to the first switching element, the second switching element and the driving circuit, and transmitting a signal for controlling the second switching element to the second switching element
- a third scanning line connecting the third switching element and the driving circuit and transmitting a signal for controlling the third switching element to the third switching element.
- the first switching element is connected to the driving circuit, and the driving circuit uses the first scanning line used to control the first switching element, the second switching element, and the driving circuit. Connecting the second scanning line used by the drive circuit to control the first switching element, the third switching element and the drive circuit, and the drive circuit to control the first switching element And a third scan line to be used.
- An image display apparatus is the image display apparatus according to the third aspect, wherein the first scanning line and the second scanning line are a common scanning line.
- the first scan line and the second scan line may be a common scan line.
- the circuit configuration can be simplified.
- An image display apparatus is the image display apparatus according to the first aspect, further comprising a fourth power supply line for supplying a second reference voltage, a second electrode of the capacitor, and the fourth power supply. And a second capacitor provided between the line and the second capacitor, wherein the second capacitor stores the source potential of the drive element while the third switching element is on.
- the second capacitor is provided between the second electrode of the capacitor and the fourth power supply line, and the source potential of the drive element is set to the second capacitor while the third switching element is on.
- the source potential of the drive element in the steady state is stored in the second capacitor, and the potential of the second electrode of the capacitor is determined even if the third switching element is turned off thereafter.
- the gate voltage of is determined. Further, since the source potential of the drive element is in a steady state, the second capacitor stabilizes the gate-source voltage of the drive element.
- An image display apparatus is the image display apparatus according to the fifth aspect, wherein the third power line and the fourth power line are common power lines.
- the third power supply line and the fourth power supply line may be a common power supply line.
- An image display apparatus is the image display apparatus according to the fifth aspect, wherein the third power line and the fourth power line are separate power lines.
- the third power supply line and the fourth power supply line may be separate power supply lines.
- the degree of freedom of circuit adjustment is improved.
- the light emitting element, the capacitor for holding a voltage, and the gate electrode are connected to the first electrode of the capacitor, and the source electrode is connected to the first electrode of the light emitting element.
- a driving element that is connected and causes the light emitting element to emit light by causing a drain current according to the voltage held by the capacitor to flow to the light emitting element, and a first power supply line for determining the potential of the drain electrode of the driving element
- a second power supply line electrically connected to the second electrode of the light emitting element, a third power supply line for supplying a reference voltage defining a voltage value of the second electrode of the capacitor, and a second power supply line of the capacitor
- a first switching element for setting the reference voltage to an electrode, a data line for supplying a signal voltage to the first electrode of the capacitor, and one terminal electrically connected to the data line;
- a second switching element electrically connected to the first electrode of the capacitor to switch between conduction and non-conduction between the data line and the first electrode of the capacitor; and a first driving element
- a third switching element for connecting the first electrode of the light emitting element and a node between the second electrode of the capacitor and the first switching element is provided, and the third switching element is turned off.
- a voltage corresponding to the signal voltage is held in the capacitor, and after the voltage corresponding to the signal voltage is held in the capacitor, the third switching element is turned on.
- the voltage can be set to the capacitor in a state where the source electrode of the drive element and the second electrode of the capacitor are not connected. That is, the current can be prevented from flowing from the source electrode of the drive transistor to the capacitor before the voltage corresponding to the signal voltage is completely held in the capacitor.
- the voltage corresponding to the signal voltage can be accurately held in the capacitor, the voltage to be held in the capacitor fluctuates, and the light emitting element does not accurately emit light by the light emission amount reflecting the video signal. Can be prevented. As a result, it is possible to accurately cause the light emitting element to emit light with the amount of light emission reflecting the video signal, and to realize highly accurate image display reflecting the video signal.
- the image display apparatus is the image display apparatus according to claim 8, wherein the first electrode of the light emitting element is an anode electrode, and the second electrode of the light emitting element is a cathode electrode.
- the voltage of the first power supply line is higher than the voltage of the second power supply line, and a current flows from the first power supply line toward the second power supply line.
- the drive element is configured by an N-type transistor.
- An image display apparatus is the image display apparatus according to the eighth or ninth aspect, wherein a signal for connecting the first switching element and the drive circuit and controlling the first switching element is used.
- a second scanning line connecting a first scanning line transmitted to the first switching element, the second switching element and the driving circuit, and transmitting a signal for controlling the second switching element to the second switching element
- a third scanning line connecting the third switching element and the driving circuit and transmitting a signal for controlling the third switching element to the third switching element.
- the first switching element is connected to the driving circuit, and the driving circuit uses the first scanning line used to control the first switching element, the second switching element, and the driving circuit. Connecting the second scanning line used by the drive circuit to control the first switching element, the third switching element and the drive circuit, and the drive circuit to control the first switching element And a third scan line to be used.
- the image display apparatus is the image display apparatus according to claim 10, wherein the first scanning line and the second scanning line are a common scanning line.
- the first scan line and the second scan line may be a common scan line.
- the circuit configuration can be simplified.
- An image display apparatus is the image display apparatus according to the eighth aspect, further comprising a fourth power supply line for supplying a second reference voltage, a second electrode of the capacitor, and the fourth power supply. And a second capacitor provided between the line and the second capacitor, wherein the second capacitor stores the source potential of the drive element while the third switching element is on.
- the second capacitor is provided between the second electrode of the capacitor and the fourth power supply line, and the source potential of the drive element is set to the second capacitor while the third switching element is on.
- the source potential of the drive element in the steady state is stored in the second capacitor, and the potential of the second electrode of the capacitor is determined even if the third switching element is turned off thereafter.
- the gate voltage of is determined.
- the second capacitor stabilizes the gate-source voltage of the drive element.
- the image display apparatus of the aspect of Claim 13 is an image display apparatus of Claim 12, Comprising: A said 3rd power wire and a said 4th power wire are common power wire.
- the third power supply line and the fourth power supply line may be a common power supply line.
- the image display apparatus is the image display apparatus according to claim 12, wherein the third power line and the fourth power line are separate power lines.
- the third power supply line and the fourth power supply line may be separate power supply lines.
- the degree of freedom of circuit adjustment is improved.
- An image display apparatus is an image display apparatus having a plurality of pixel units, wherein adjacent first pixel units and second pixel units in the plurality of pixel units are: A light emitting element, a capacitor for holding a voltage, and a gate electrode are connected to the first electrode of the capacitor, a source electrode is connected to the first electrode of the light emitting element, and the voltage corresponds to the voltage held in the capacitor.
- a driving element for causing the light emitting element to emit light by supplying a drain current to the light emitting element, a first power supply line for determining a potential of a drain electrode of the driving element, and a second electrode of the light emitting element electrically A second power supply line connected, a third power supply line for supplying a reference voltage defining a voltage value of the first electrode of the capacitor, and a first switch for setting the reference voltage to the first electrode of the capacitor
- a data element for supplying a signal voltage to the second electrode of the capacitor, and one terminal is electrically connected to the data line, and the other terminal is electrically connected to the second electrode of the capacitor.
- a second switching element for switching between conduction and non-conduction between the data line and the second electrode of the capacitor; and a third switching element for connecting the first electrode of the light emitting element and the second electrode of the capacitor
- a first scanning line for transmitting a signal for controlling the first switching element to the first switching element, a second scanning line for transmitting a signal for controlling the second switching element to the second switching element, and And a third scanning line for transmitting a signal for controlling a third switching element to the third switching element, and the image display device is configured to transmit the signal through the first scanning line.
- the switching device includes a driving circuit for controlling the third switching device, and the driving circuit turns on the first switching device and the second switching device while the third switching device is turned off. After the voltage corresponding to the signal voltage is held in the capacitor, and the voltage corresponding to the signal voltage is held in the capacitor, the first switching element and the second switching element are turned off to turn the third switching element.
- the first scanning line included in the first pixel unit and the second scanning line included in the first pixel unit are turned on.
- the third scanning line included in the second pixel unit is branched from a common scanning line from the drive circuit.
- the circuit configuration as the image display device can be simplified, and the scanning lines can be reduced.
- the drive circuit for controlling the switching element can be simplified.
- An image display apparatus is the image display apparatus according to any one of claims 1 to 15, wherein the light emitting element is an organic EL light emitting element.
- the light emitting element may be an organic EL light emitting element.
- a light emitting element a capacitor for holding a voltage
- a gate electrode is connected to a first electrode of the capacitor
- a source electrode is the first light emitting element.
- a driving element which is connected to one electrode and causes the light emitting element to emit light by causing a drain current according to the voltage held in the capacitor to flow to the light emitting element, and a potential for determining the potential of the drain electrode of the driving element 1 power supply line, a second power supply line electrically connected to the second electrode of the light emitting element, a third power supply line for supplying a reference voltage defining a voltage value of the first electrode of the capacitor, and the capacitor
- a first switching element for setting the reference voltage to the first electrode of the first data line, a data line supplying a signal voltage to the second electrode of the capacitor, and one terminal electrically connected to the data line
- a light emitting element In the control method of an image display device according to an eighteenth aspect of the present invention, a light emitting element, a capacitor holding a voltage, a gate electrode is connected to a first electrode of the capacitor, and a source electrode is connected to the first light emitting element.
- a driving element which is connected to one electrode and causes the light emitting element to emit light by causing a drain current according to the voltage held in the capacitor to flow to the light emitting element, and a potential for determining the potential of the drain electrode of the driving element 1 power supply line, a second power supply line electrically connected to the second electrode of the light emitting element, a third power supply line for supplying a reference voltage for defining a voltage value of the second electrode of the capacitor, and the capacitor
- a first switching element for setting the reference voltage to the second electrode of the second data line, a data line supplying a signal voltage to the first electrode of the capacitor, and one terminal electrically connected to the data line
- a control method of an image display device comprising: an electrode and a third switching element for connecting a second electrode of the capacitor, wherein the first switching is performed while the third switching element is turned off
- Embodiment 1 The image display apparatus according to the present embodiment includes a plurality of light emitting pixels arranged in a matrix, each light emitting pixel includes a light emitting element, a capacitor, a gate connected to the first electrode of the capacitor, and a source is a light emitting element And a third switching element for switching between conduction and non-conduction between the source of the drive element and the second electrode of the capacitor, and conduction and non-conduction between the reference power supply line and the first electrode of the capacitor. And a second switching element for switching between conduction and non-conduction between the data line and the second electrode of the capacitor.
- FIG. 1 is a block diagram showing the electrical configuration of the image display apparatus of the present invention.
- the image display device 1 in FIG. 1 includes a control circuit 2, a memory 3, a scanning line drive circuit 4, a signal line drive circuit 5, and a display unit 6.
- FIG. 2 is a diagram showing a circuit configuration of a light emitting pixel included in the display unit according to the first embodiment of the present invention and connection with peripheral circuits thereof.
- the switching transistors 11, 12 and 19 the electrostatic holding capacitance 13, the driving transistor 14, the organic EL element 15, the signal line 16, the scanning lines 17 and 18, and the reference power supply line 20, a positive power supply line 21 and a negative power supply line 22.
- the peripheral circuit also includes a scanning line drive circuit 4 and a signal line drive circuit 5.
- the control circuit 2 has a function of controlling the scanning line drive circuit 4, the signal line drive circuit 5, and the memory 3.
- the memory 3 stores correction data of each light emitting pixel, etc.
- the control circuit 2 reads the correction data written in the memory 3 and corrects the video signal input from the outside based on the correction data. Output to the signal line drive circuit 5.
- the scanning line drive circuit 4 is connected to the scanning lines 17 and 18 and outputs scanning signals to the scanning lines 17 and 18 to turn on / off the switching transistors 11, 12 and 19 of the light emitting pixel 10. It is a drive circuit having a control function.
- the signal line drive circuit 5 is a drive circuit connected to the signal line 16 and having a function of outputting a signal voltage based on the video signal to the light emitting pixel 10.
- the display unit 6 includes a plurality of light emitting pixels 10, and displays an image based on a video signal input to the image display device 1 from the outside.
- the switching transistor 11 has a gate connected to a scanning line 17 which is a second scanning line, one of a source and a drain connected to a signal line 16 which is a data line, and the other of the source and drain has a second one. It is a second switching element connected to an electrode 132 which is a two-electrode.
- the switching transistor 11 has a function of determining the timing of applying the signal voltage of the signal line 16 to the electrode 132 of the electrostatic holding capacitor 13.
- the gate is connected to the scanning line 17 which is the first scanning line
- one of the source and the drain is connected to the reference power supply line 20 which is the first reference power supply line
- the other of the source and the drain is held electrostatically
- the first switching element is connected to the electrode 131 which is the first electrode of the capacitor 13.
- the switching transistor 12 has a function of determining the timing of applying the reference voltage VREF of the reference power supply line 20 to the electrode 131 of the electrostatic holding capacitor 13.
- the switching transistors 11 and 12 are configured by, for example, n-type thin film transistors (n-type TFTs).
- the electrostatic holding capacitance 13 is a capacitor in which an electrode 131 which is a first electrode is connected to the gate of the drive transistor 14 and an electrode 132 which is a second electrode is connected to the source of the drive transistor 14 via the switching transistor 19. .
- the electrostatic holding capacitance 13 holds a voltage corresponding to the signal voltage supplied from the signal line 16. For example, after the switching transistors 11 and 12 are turned off, the potential between the gate and source electrodes of the driving transistor 14 is It has a function of holding stably and stabilizing the current supplied from the drive transistor 14 to the organic EL element 15.
- the drive transistor 14 is a drive element whose drain is connected to the positive power supply line 21 which is a second power supply line, and whose source is connected to the anode of the organic EL element 15.
- the drive transistor 14 converts a voltage corresponding to the signal voltage applied between the gate and the source into a drain current corresponding to the signal voltage. Then, the drain current is supplied to the organic EL element 15 as a signal current.
- the driving transistor 14 is configured of, for example, an n-type thin film transistor (n-type TFT).
- the organic EL element 15 is a light emitting element whose cathode is connected to a negative power supply line 22 which is a second power supply line, and emits light when the signal current flows from the drive transistor 14.
- the gate is connected to the scanning line 18 which is the third scanning line, one of the source and the drain is connected to the source of the driving transistor 14, and the other of the source and the drain is the electrode 132 of the electrostatic holding capacitance 13. It is a third switching element connected.
- the switching transistor 19 has a function of determining the timing of applying the potential held by the electrostatic holding capacitor 13 between the gate and source electrodes of the driving transistor 14.
- the switching transistor 19 is configured of, for example, an n-type thin film transistor (n-type TFT).
- the signal line 16 is connected to the signal line drive circuit 5, connected to each light emitting pixel belonging to the pixel column including the light emitting pixel 10, and has a function of supplying a signal voltage for determining the light emission intensity.
- the image display device 1 includes signal lines 16 for the number of pixel columns.
- the scanning line 17 is a first scanning line and a second scanning line, and is connected to the scanning line drive circuit 4 and connected to each light emitting pixel belonging to a pixel row including the light emitting pixel 10.
- the scanning line 17 has a function of supplying a timing for writing the signal voltage to each light emitting pixel belonging to the pixel row including the light emitting pixel 10, and applies the reference voltage VREF to the gate of the driving transistor 14 of the light emitting pixel. It has a function to supply timing.
- the scanning line 18 is a third scanning line and is connected to the scanning line drive circuit 4.
- the scanning line 18 has a function of supplying the timing of applying the potential of the electrode 132 of the electrostatic holding capacitor 13 to the source of the driving transistor 14.
- the image display device 1 includes scanning lines 17 and 18 for the number of pixel rows.
- the reference power supply line 20, the positive power supply line 21 which is the first power supply line, and the negative power supply line 22 which is the second power supply line are used for other light emitting pixels. are also connected and connected to a voltage source.
- FIG. 3A is an operation timing chart of a control method of the image display device according to Embodiment 1 of the present invention.
- the horizontal axis represents time.
- waveform charts of voltages generated in the scanning line 17, the scanning line 18, and the signal line 16 are shown in order from the top.
- FIG. 4 is an operation flowchart of the image display device according to Embodiment 1 of the present invention.
- the scanning line drive circuit 4 changes the voltage level of the scanning line 18 from HIGH to LOW to turn off the switching transistor 19.
- the source of the drive transistor 14 and the electrode 132 of the electrostatic holding capacitor 13 become nonconductive (S11 in FIG. 4).
- HIGH of the voltage level of the scanning line 18 is set to +20 V, and LOW is set to -10 V.
- FIG. 5A is a diagram showing a conductive state of the pixel circuit at the time of signal voltage writing in the image display device according to Embodiment 1 of the present invention.
- the reference voltage VREF of the reference power supply line 20 is applied to the electrode 131 of the electrostatic holding capacitance 13, and the signal voltage Vdata is applied to the electrode 132 from the signal line 16 (FIG. 4).
- S12 That is, in step S12, the electrostatic holding capacitor 13 holds the charge corresponding to the signal voltage to be applied to the light emitting pixel 10.
- the source of the driving transistor 14 and the electrode 132 of the electrostatic holding capacitor 13 are rendered non-conductive by the operation of step S11. Furthermore, although the reference voltage VREF of the reference power supply line 20 is applied to the gate of the drive transistor 14, it is set to a potential at which the drive transistor 14 is turned off. Therefore, at this time, since the source-drain current of the drive transistor 14 does not flow, the organic EL element 15 does not emit light. In the present embodiment, for example, HIGH of the voltage level of the scanning line 17 is set to +20 V, and LOW is set to -10 V. Also, VREF is set to 0V, and Vdata is set to -5V to 0V.
- the signal voltage Vdata is applied to the electrode 132 of the light emitting pixel 10 from the signal line 16, and similarly, the pixel row including the light emitting pixel 10 is A signal voltage is supplied to each light emitting pixel to which it belongs.
- the scanning line driving circuit 4 changes the voltage level of the scanning line 17 from HIGH to LOW to turn off the switching transistors 11 and 12.
- the electrode 131 of the electrostatic holding capacitor 13 and the reference power supply line 20 do not conduct
- the electrode 132 of the electrostatic holding capacitor 13 and the signal line 16 do not conduct (S13 in FIG. 4).
- FIG. 5B is a diagram showing a conductive state of the pixel circuit at the time of light emission of the image display device according to Embodiment 1 of the present invention.
- the source of the drive transistor 14 and the electrode 132 of the electrostatic holding capacitor 13 are conducted (S14 in FIG. 4).
- the electrode 131 of the electrostatic holding capacitor 13 is disconnected from the reference power supply line 20, and the electrode 132 is disconnected from the signal line 16.
- the gate potential of the drive transistor 14 changes with the fluctuation of the source potential, and (VREF ⁇ Vdata) which is the voltage across the electrostatic holding capacitance 13 is applied between the gate and the source.
- a signal current corresponding to ⁇ Vdata) flows to the organic EL element 15.
- the source potential of the drive transistor 14 changes from 0 V to 10 V due to the conduction of the switching transistor 19.
- the voltage VDD of the positive power supply line is set to +20 V
- the voltage VEE of the negative power supply line is set to 0 V.
- the period of t0 to t4 corresponds to one frame period in which the light emission intensity of all the light emitting pixels of the image display device 1 is updated, and the operation of the period of t0 to t4 is repeated even after t4.
- FIG. 3B is an operation timing chart showing a modified example of the control method of the image display device according to Embodiment 1 of the present invention.
- the scanning line drive circuit 4 simultaneously executes the operation at time t0 described in FIG. 3A in the first embodiment and the operation at time t1 described in FIG. 3A (FIG. 4). S11 and S12). That is, the source of the drive transistor 14 and the electrode 132 of the electrostatic holding capacitance 13 do not conduct, and at the same time, the reference voltage VREF is applied to the electrode 131 of the electrostatic holding capacitance 13 and the signal voltage Vdata is applied to the electrode 132 Be done.
- the scanning line driving circuit 4 simultaneously executes the operation at time t2 described in FIG. 3A in the first embodiment and the operation at time t3 described in FIG. 3A (FIG. 4 S13 and S14). That is, the electrode 131 of the electrostatic holding capacitor 13 and the reference power supply line 20 do not conduct, and the electrode 132 of the electrostatic holding capacitor 13 and the signal line 16 do not conduct, and the source of the driving transistor 14 and the electrostatic holding capacitor 13 And the electrode 132 of the At this time, (VREF ⁇ Vdata) which is the voltage across the electrostatic holding capacitance 13 is applied between the gate and the source of the driving transistor 14, so the signal current corresponding to this (VREF ⁇ Vdata) is an organic EL element It flows to 15.
- VREF ⁇ Vdata which is the voltage across the electrostatic holding capacitance 13 is applied between the gate and the source of the driving transistor 14, so the signal current corresponding to this (VREF ⁇ Vdata) is an organic EL element It flows to 15.
- the voltage (VREF-Vdata) which is the voltage across the electrostatic holding capacitance 13 continues to be applied between the gate and the source, and the signal current continues to cause the organic EL element 15 to keep emitting light.
- the period of t10 to t12 corresponds to one frame period in which the light emission intensity of all the light emitting pixels of the image display device 1 is updated, and the operation of the period of t10 to t12 is repeated after t12.
- the current flowing through the drive transistor is always only through the light emitting element, so that steady current is supplied to the power supply line and the signal line. Does not flow. Therefore, an accurate potential can be recorded on both end electrodes of the electrostatic holding capacitance having a function of holding a voltage to be applied between the gate and the source of the drive transistor, and a highly accurate image display reflecting the video signal It is possible to
- the image display apparatus includes a plurality of light emitting pixels arranged in a matrix, each light emitting pixel includes a light emitting element, a capacitor, a gate connected to the first electrode of the capacitor, and a source is a light emitting element And a third switching element for switching between conduction and non-conduction between the source of the drive element and the second electrode of the capacitor; conduction and non-conduction between the reference power supply line and the second electrode of the capacitor And a second switching element for switching between conduction and non-conduction between the data line and the first electrode of the capacitor.
- FIG. 6 is a diagram showing a circuit configuration of a light emitting pixel included in a display unit according to Embodiment 2 of the present invention and connection thereof with peripheral circuits.
- the peripheral circuit also includes a scanning line drive circuit 4 and a signal line drive circuit 5.
- the light emitting pixel 30 according to the present embodiment differs from the light emitting pixel 10 according to the first embodiment only in the connection of the switching transistor to the both end electrodes of the electrostatic holding capacitance 13 as the configuration.
- the scanning line drive circuit 4 is connected to the scanning lines 17 and 18 and outputs scanning signals to the scanning lines 17 and 18 to turn on / off the switching transistors 19, 31 and 32 of the light emitting pixel 30. It is a drive circuit having a control function.
- the signal line drive circuit 5 is a drive circuit connected to the signal line 16 and having a function of outputting a signal voltage based on the video signal to the light emitting pixel 30.
- the gate is connected to the scanning line 17 which is the second scanning line, one of the source and the drain is connected to the signal line 16 which is the data line, and the other of the source and the drain is the electrode of the electrostatic holding capacitance 13. It is a second switching element connected to 131.
- the switching transistor 31 has a function of determining the timing of applying the signal voltage of the signal line 16 to the electrode 131 of the electrostatic holding capacitor 13.
- the gate is connected to the scanning line 17 which is the first scanning line, one of the source and the drain is connected to the reference power supply line 20, and the other of the source and the drain is connected to the electrode 132 of the electrostatic holding capacitance 13.
- the first switching element has a function of determining the timing of applying the reference voltage VREF of the reference power supply line 20 to the electrode 132 of the electrostatic holding capacitor 13.
- the switching transistors 31 and 32 are configured by, for example, n-type thin film transistors (n-type TFTs).
- the electrostatic holding capacitance 13 holds a charge corresponding to the signal voltage supplied from the signal line 16. For example, after the switching transistors 31 and 32 are turned off, the potential between the gate and source electrodes of the driving transistor 14 is It is a capacitor which holds stably and stabilizes the current supplied from the drive transistor 14 to the organic EL element 15.
- the signal line 16 is connected to the signal line drive circuit 5, connected to each light emitting pixel belonging to the pixel column including the light emitting pixel 30, and has a function of supplying a signal voltage for determining the light emission intensity.
- the image display apparatus includes the signal lines 16 for the number of pixel columns.
- the scanning line 17 has a function of supplying a timing for writing the signal voltage to each light emitting pixel belonging to a pixel row including the light emitting pixel 30, and supplies a timing for applying a reference voltage VREF to the gate of the drive transistor 14 of the light emitting pixel.
- FIG. 3A is an operation timing chart of the control method of the image display device according to the second embodiment of the present invention.
- FIG. 7 is an operation flowchart of the image display device according to the second embodiment of the present invention.
- the scanning line drive circuit 4 changes the voltage level of the scanning line 18 from HIGH to LOW to turn off the switching transistor 19.
- the source of the drive transistor 14 and the electrode 132 which is the second electrode of the electrostatic holding capacitor 13 become nonconductive (S21 in FIG. 7).
- HIGH of the voltage level of the scanning line 18 is set to +20 V, and LOW is set to -10 V.
- the scanning line drive circuit 4 changes the voltage level of the scanning line 17 from LOW to HIGH to turn on the switching transistors 31 and 32.
- the signal voltage Vdata is applied from the signal line 16 to the electrode 131 which is the first electrode of the electrostatic holding capacitance 13, and the reference voltage VREF of the reference power supply line 20 is applied to the electrode 132 (S22 of FIG. 7). ). That is, in step S22, the electrostatic holding capacitor 13 holds the charge corresponding to the signal voltage to be applied to the light emitting pixel 30.
- the source of the drive transistor 14 and the electrode 132 of the electrostatic holding capacitor 13 are rendered non-conductive by the operation of step S21.
- the maximum potential VDH of the signal line 16 is set to a potential at which the drive transistor 14 is turned off when applied to the gate of the drive transistor 14. Therefore, at this time, since the source-drain current of the drive transistor 14 does not flow, the organic EL element 15 does not emit light.
- VREF is set to 0 V
- Vdata is set to -5 V (VDH) to 0 V
- VDD is +20 V
- VEE is set to 0 V.
- the potential VREF of the reference power supply line 20 can supply the maximum signal current value to the organic EL element 15 when the gate-source voltage of the drive transistor 14 in step S24 described later is (VDH-VREF). Maximum signal potential VDH is adjusted.
- the signal voltage Vdata is applied from the signal line 16 to the electrode 131 of the light emitting pixel 30, and similarly, in the pixel row including the light emitting pixel 30.
- a signal voltage is supplied to each light emitting pixel to which it belongs.
- the electrode 131 and the electrode 132 of the electrostatic capacitance 13 are disconnected from the positive power supply line 21 for supplying current to the organic EL element 15, the negative power supply line 22, and the anode of the organic EL element 15. Therefore, since only the capacitive load is connected to reference power supply line 20, a voltage drop due to steady current does not occur. Further, the potential difference generated between the drain and the source of the switching transistor 32 becomes 0 V when the charging of the electrostatic holding capacitance 13 is completed. The same applies to the signal line 16 and the switching transistor 31. As a result, accurate voltages Vdata and VREF corresponding to the signal voltage are written to the electrode 131 and the electrode 132 of the electrostatic holding capacitance 13, respectively.
- the scanning line drive circuit 4 changes the voltage level of the scanning line 17 from HIGH to LOW to turn off the switching transistors 31 and 32.
- the electrode 131 of the electrostatic holding capacitor 13 and the signal line 16 do not conduct, and the electrode 132 of the electrostatic holding capacitor 13 and the reference power supply line 20 do not conduct (S23 in FIG. 7).
- the scanning line drive circuit 4 changes the voltage level of the scanning line 18 from LOW to HIGH, and turns on the switching transistor 19.
- the source of the drive transistor 14 and the electrode 132 of the electrostatic holding capacitor 13 are electrically connected (S24 in FIG. 7).
- the electrode 131 of the electrostatic holding capacitor 13 is disconnected from the signal line 16, and the electrode 132 is disconnected from the reference power supply line 20. Therefore, the gate potential of the drive transistor 14 changes, and a potential difference of (Vdata ⁇ VREF) which is a voltage across the electrostatic holding capacitance 13 is applied between the gate and the source.
- the signal current corresponding to the current flows to the organic EL element 15.
- the source potential of the drive transistor 14 changes from +2 V to +10 V due to the conduction of the switching transistor 19. Further, the voltage VDD of the positive power supply line is set to +20 V, and the voltage VEE of the negative power supply line is set to 0 V.
- Vdata-VREF which is the voltage across the electrostatic storage capacitor 13
- the signal current continues to cause the organic EL element 15 to continue emitting light.
- the period of t0 to t4 corresponds to one frame period in which the light emission intensity of all the light emitting pixels is updated, and the operation of the period of t0 to t4 is repeated even after t4.
- FIG. 3B is an operation timing chart showing a modified example of the control method of the image display device according to Embodiment 2 of the present invention.
- scanning line drive circuit 4 simultaneously executes the operation at time t0 described in FIG. 3A in the second embodiment and the operation at time t1 described in FIG. 3A (FIG. 7). S21 and S22). That is, the source of the drive transistor 14 and the electrode 132 of the electrostatic holding capacitor 13 do not conduct, and at the same time, the signal voltage Vdata is applied to the electrode 131 of the electrostatic holding capacitor 13 and the reference voltage VREF is applied to the electrode 132 Be done.
- the scanning line drive circuit 4 simultaneously executes the operation at time t2 described in FIG. 3A in the second embodiment and the operation at time t3 described in FIG. 3A (FIG. 7 of S23 and S24). That is, the electrode 131 of the electrostatic holding capacitance 13 and the signal line 16 do not conduct, and the electrode 132 of the electrostatic holding capacitance 13 and the reference power supply line 20 do not conduct, and the source of the driving transistor 14 and the electrostatic holding capacitance 13 And the electrode 132 of the At this time, (Vdata-VREF) which is the voltage across the electrostatic holding capacitance 13 is applied between the gate and the source of the drive transistor 14, so the signal current corresponding to this (Vdata-VREF) is an organic EL element It flows to 15.
- Vdata-VREF which is the voltage across the electrostatic holding capacitance 13 is applied between the gate and the source of the drive transistor 14, so the signal current corresponding to this (Vdata-VREF) is an organic EL element It flows to 15.
- Vdata-VREF which is the voltage across the electrostatic holding capacitance 13
- the signal current continues to cause the organic EL element 15 to keep emitting light.
- the period of t10 to t12 corresponds to one frame period in which the light emission intensity of all the light emitting pixels is updated, and the operation of the period of t10 to t12 is repeated after t12.
- the scanning lines 17 and 18 interlock. Therefore, since the scanning line control circuit is simplified, the circuit scale can be reduced, and the switching transistor 31 and the switching transistor 32 are n (p) type, and the switching transistor 19 is p (n) type. This makes it possible to reduce the number of outputs of the scanning line drive circuit 4 by making the scanning lines 17 and 18 the same wiring.
- the current flowing through the drive transistor is always only through the light emitting element, and the steady current is Not flowing. Therefore, an accurate potential can be recorded on both end electrodes of the electrostatic holding capacitance having a function of holding the voltage between the gate and the source of the drive transistor, and a highly accurate image display reflecting the video signal can be performed. It becomes possible.
- the image display apparatus includes a plurality of light emitting pixels arranged in a matrix, each light emitting pixel includes a light emitting element, a capacitor, a gate connected to the first electrode of the capacitor, and a source is a light emitting element
- FIG. 8 is a diagram showing a circuit configuration of a light emitting pixel included in a display unit according to Embodiment 3 of the present invention and connection with peripheral circuits thereof.
- the peripheral circuit also includes a scanning line drive circuit 4 and a signal line drive circuit 5.
- the electrostatic holding capacitance 41 is connected between the electrode 132 of the electrostatic holding capacitance 13 and the reference power supply line 20. The only difference is in the configuration.
- the electrostatic holding capacitor 41 is a second capacitor connected between the electrode 132 which is the second electrode of the electrostatic holding capacitor 13 and the reference power supply line 20 which is the fourth power supply line.
- the electrostatic holding capacitance 41 first stores the source potential of the drive transistor 14 in the steady state, with the switching transistor 19 conducting. Thereafter, even if the switching transistor 19 is turned off, the potential of the electrode 132 of the electrostatic holding capacitor 13 is determined, and therefore the gate voltage of the driving transistor 14 is determined. On the other hand, since the source potential of the drive transistor 14 is already in the steady state, the electrostatic holding capacitance 41 has the function of stabilizing the gate-source voltage of the drive transistor 14 as a result.
- the electrostatic holding capacitance 41 may be connected to a reference power supply line different from the reference power supply line 20 which is the first power supply line to which one of the source and the drain of the switching transistor 12 is connected.
- the positive power supply line VDD or the negative power supply line VEE may be used. In this case, the degree of freedom in layout is improved, a wider space between elements can be secured, and the yield is improved.
- the reference power supply is made common, the number of reference power supply lines can be reduced, so that the pixel circuit can be simplified.
- FIG. 9 is an operation timing chart of the control method of the image display device according to the third embodiment of the present invention.
- FIG. 10 is an operation flowchart of the image display device according to the third embodiment of the present invention.
- the scanning line driving circuit 4 changes the voltage level of the scanning line 17 from LOW to HIGH, and turns on the switching transistors 11 and 12.
- the reference voltage VREF of the reference power supply line 20 is applied to the electrode 131 which is the first electrode of the electrostatic holding capacitance 13, and the signal voltage Vdata is applied to the electrode 132 which is the second electrode from the signal line 16. (S31 in FIG. 10). That is, in step S31, the electrostatic holding capacitor 13 holds the charge corresponding to the signal voltage to be applied to the light emitting pixel 40.
- the signal voltage Vdata is applied from the signal line 16 to the electrode 132 of the light emitting pixel 40, and similarly, in the pixel row including the light emitting pixel 40.
- a signal voltage is supplied to each light emitting pixel to which it belongs.
- the scanning line drive circuit 4 changes the voltage level of the scanning line 17 from HIGH to LOW to turn off the switching transistors 11 and 12.
- the electrode 131 of the electrostatic holding capacitor 13 and the reference power supply line 20 do not conduct, and the electrode 132 of the electrostatic holding capacitor 13 and the signal line 16 do not conduct (S32 in FIG. 10).
- the scanning line drive circuit 4 changes the voltage level of the scanning line 18 from LOW to HIGH to turn on the switching transistor 19.
- the source of the drive transistor 14 and the electrode 132 of the electrostatic holding capacitor 13 are electrically connected (S32 in FIG. 10).
- the electrode 131 of the electrostatic holding capacitor 13 is disconnected from the reference power supply line 20, and the electrode 132 is disconnected from the signal line 16. Therefore, the gate potential of the drive transistor 14 changes, and (VREF-Vdata), which is the voltage across the electrostatic holding capacitance 13, is applied between the gate and the source, so that it corresponds to this (VREF-Vdata).
- the signal current flows to the organic EL element 15.
- the source potential of the drive transistor 14, the voltage VDD of the positive power supply line, and the voltage VEE of the negative power supply line are the same as the voltage values described in the first embodiment, for example.
- the scanning line driving circuit 4 changes the voltage level of the scanning line 18 from HIGH to LOW to turn off the switching transistor 19 (S33 in FIG. 10).
- the electrostatic holding capacitance 41 stores the source potential of the driving transistor 14. Therefore, the potential of the electrode 132 of the electrostatic holding capacitance 13 is determined, and as a result, the potential of the electrode 131, that is, the gate potential of the driving transistor 14 is stabilized.
- the source potential of the drive transistor 14 is constant in the steady state, the gate-source voltage of the drive transistor 14 is stabilized. That is, in the steady state, the signal current is stabilized regardless of the on / off state of the switching transistor 19.
- the scanning signal waveform and timing of the scanning line 18 are the scanning signal of the scanning line 17 connected to the subsequent light emitting pixel in the same column. It is possible to share the waveform and timing.
- FIG. 11 is a diagram showing a circuit configuration showing a modification of a light emitting pixel in a display unit according to Embodiment 3 of the present invention and a connection with its peripheral circuit.
- switching transistors 11A, 12A and 19A electrostatic holding capacitors 13A and 41A, drive transistor 14A, organic EL element 15A, signal line 16, scanning lines 17A and 17B, and A power supply line 20, a positive power supply line 21, and a negative power supply line 22 are provided.
- the peripheral circuit also includes a scanning line drive circuit 4 and a signal line drive circuit 5.
- circuit configurations of the light emitting pixels 10A and 10B and the functions of the circuit components are the same as those of the light emitting pixel 40 described in FIG.
- the light emitting pixels 10B are arranged in the same pixel column as the light emitting pixels 10A and one row after the light emitting pixels 10A.
- the scanning line 17B connected to the light emitting pixel 10A is also connected to the light emitting pixel 10B.
- FIG. 12 a modification of the control method of the image display device according to the present embodiment will be described with reference to FIGS. 12 and 13.
- FIG. 12 a modification of the control method of the image display device according to the present embodiment will be described with reference to FIGS. 12 and 13.
- FIG. 12 is an operation timing chart showing a modification of the method of controlling light emitting pixels in the image display device according to Embodiment 3 of the present invention.
- FIG. 13 is an operation flowchart showing a modification of the light emitting pixel of the image display device according to Embodiment 3 of the present invention.
- the scanning line drive circuit 4 changes the voltage level of the scanning line 17A from LOW to HIGH to turn on the switching transistors 11A and 12A.
- the reference voltage VREF of the reference power supply line 20 is applied to the electrode 131A which is the first electrode of the electrostatic holding capacitance 13A, and the signal voltage V A data is applied to the electrode 132A which is the second electrode from the signal line 16. (S41 of FIG. 13).
- the signal voltage V A data is applied from the signal line 16 to the electrode 132A of the light emitting pixel 10A which is the pixel A.
- a signal voltage is supplied to each light emitting pixel belonging to the pixel row including 10A.
- the scanning line driving circuit 4 changes the voltage level of the scanning line 17A from HIGH to LOW to turn off the switching transistors 11A and 12A.
- the electrode 131A of the electrostatic holding capacitor 13A and the reference power supply line 20 do not conduct, and the electrode 132A of the electrostatic holding capacitor 13A and the signal line 16 do not conduct (S42 in FIG. 13).
- the scanning line drive circuit 4 changes the voltage level of the scanning line 17B from LOW to HIGH, and turns on the switching transistor 19A.
- the source of the drive transistor 14A and the electrode 132A of the electrostatic holding capacitor 13A are electrically connected (S42 in FIG. 13).
- the electrode 131A of the electrostatic holding capacitor 13A is disconnected from the reference power supply line 20, and the electrode 132A is disconnected from the signal line 16.
- the gate potential of the drive transistor 14A changes, and a signal current corresponding to (VREF ⁇ V A data) flows to the organic EL element 15A.
- the scanning line driving circuit 4 changes the voltage level of the scanning line 17B from LOW to HIGH to turn on the switching transistors 11B and 12B in the light emitting pixel 10B which is the pixel B.
- the reference voltage VREF of the reference power supply line 20 is applied to the electrode 131 B which is the first electrode of the electrostatic holding capacitance 13 B, and the signal voltage V B data is applied to the electrode 132 B which is the second electrode from the signal line 16. (S42 in FIG. 13).
- the signal voltage V B data is applied from the signal line 16 to the electrode 132B of the light emitting pixel 10B, and similarly, the pixel including the light emitting pixel 10B A signal voltage is supplied to each light emitting pixel belonging to the row.
- (VREF-V A data) which is the voltage across the electrostatic holding capacitance 13A, is continuously applied between the gate and source of the driving transistor 14A in the light emitting pixel 10A, and the driving current flows. 15A sustains light emission.
- the scanning line drive circuit 4 changes the voltage level of the scanning line 17B from HIGH to LOW to turn off the switching transistor 19A (S43 in FIG. 13).
- the electrostatic holding capacitance 41A stores the source potential of the driving transistor 14A.
- the gate-source voltage of the drive transistor 14A is stabilized. That is, the signal current of the light emitting pixel 10A is stabilized regardless of the on / off state of the switching transistor 19A.
- the voltage level of the scanning line 17B changes from HIGH to LOW, whereby the switching transistors 11B and 12B are turned off. Thereby, the electrode 131B of the electrostatic holding capacitance 13B and the reference power supply line 20 do not conduct, and the electrode 132B of the electrostatic holding capacitance 13B and the signal line 16 do not conduct (S43 of FIG. 13).
- the scanning line drive circuit 4 changes the voltage level of the scanning line 17C from LOW to HIGH, and turns on the switching transistor 19B.
- the source of the drive transistor 14B and the electrode 132B of the electrostatic holding capacitor 13B are electrically connected (S43 in FIG. 13).
- the electrode 131 B of the electrostatic holding capacitor 13 B is disconnected from the reference power supply line 20, and the electrode 132 B is disconnected from the signal line 16.
- the gate potential of the drive transistor 14B changes, and a drive current corresponding to (VREF ⁇ V B data) flows to the organic EL element 15B.
- (VREF-V B data) which is the voltage across the electrostatic holding capacitor 13B, continues to be applied between the gate and source of the drive transistor 14B in the light emitting pixel 10B, and a drive current flows.
- the organic EL element 15B continues the light emission.
- the scanning line drive circuit 4 changes the voltage level of the scanning line 17C from HIGH to LOW to turn off the switching transistor 19B.
- the electrostatic holding capacitance 41B stores the source potential of the driving transistor 14B.
- the gate-source voltage of the drive transistor 14B is stabilized. That is, the signal current of the light emitting pixel 10B is stabilized regardless of the on / off state of the switching transistor 19B.
- the electrostatic holding capacitance 41 which is the second capacitor
- the electrostatic holding capacitance 41 which is the second capacitor
- the both electrodes of the capacitor that holds the voltage to be applied between the gate and the source of the n-type drive TFT operating with source grounding are used. It becomes possible to record an accurate potential corresponding to the signal voltage. Therefore, it is possible to display an image with high accuracy reflecting the video signal. Furthermore, by arranging the second capacitor for storing the source potential of the n-type drive TFT, the voltage between the gate and the source of the n-type drive TFT is kept stable, so the drive current is stabilized, that is, stable. A light emitting operation is possible.
- the image display apparatus according to the present invention is not limited to the above-described embodiment. A range which does not deviate from the gist of the present invention with respect to another embodiment realized by combining arbitrary components in the embodiments 1 to 3 and their modifications, and the embodiments 1 to 3 and their modifications.
- the present invention also includes modifications obtained by applying various modifications that will occur to those skilled in the art, and various devices incorporating the display device according to the present invention.
- FIG. 14 is a diagram showing a circuit configuration of a light emitting pixel in which the second and third embodiments of the present invention are combined and a connection with the peripheral circuit thereof.
- the light emitting pixel 50 described in the figure includes the switching transistors 19, 31 and 32, the electrostatic holding capacitors 13 and 51, the driving transistor 14, the organic EL element 15, the signal line 16, the scanning lines 17 and 18. , A reference power supply line 20, a positive power supply line 21, and a negative power supply line 22.
- the peripheral circuit also includes a scanning line drive circuit 4 and a signal line drive circuit 5.
- the light emitting pixel 50 differs from the light emitting pixel 40 according to the third embodiment described in FIG. 8 only in the connection of the switching transistor to the both electrodes of the electrostatic holding capacitance 13 as the configuration.
- the electrostatic holding capacitance 51 is a second capacitor connected between the electrode 132 of the electrostatic holding capacitance 13 and the reference power supply line 20, and is similar to the electrostatic holding capacitance 41 of the luminescent pixel 40 of the third embodiment. And the function of stabilizing the gate-source voltage of the drive transistor 14.
- the electrostatic holding capacitor 51 may be connected to a reference power supply line different from the reference power supply line 20 to which one of the source and the drain of the switching transistor 32 is connected.
- a reference power supply line different from the reference power supply line 20 to which one of the source and the drain of the switching transistor 32 is connected.
- the positive power supply line VDD or the negative power supply line VEE may be used. In this case, the degree of freedom in layout is improved, a wider space between elements can be secured, and the yield is improved.
- the switching transistors 12 and 32 (first switching element) and the switching transistors 11 and 31 (second switching element) are similarly controlled by the same scanning line 17 through Embodiments 1 to 3,
- the first switching element and the second switching element may be on / off controlled independently on different scanning lines (first and second scanning lines).
- the application of the signal voltage from the signal line 16 to the electrostatic holding capacitor 13 (capacitor) and the application of the reference voltage from the reference power supply line 20 to the electrostatic holding capacitor 13 are timing-controlled independently. This also makes it possible to execute duty control of light emission in one frame.
- the inverted image display apparatus also exhibits the same effects as those of the above-described embodiments.
- the switching transistor is described on the premise that it is an FET having a gate, a source and a drain, but in these transistors, a bipolar transistor having a base, a collector and an emitter is It may be applied. Also in this case, the object of the present invention is achieved and the same effect can be obtained.
- the display device according to the present invention is incorporated in a thin flat TV as described in FIG.
- a thin flat TV capable of high-accuracy image display reflecting a video signal is realized.
- the present invention is particularly useful for an active type organic EL flat panel display in which the luminance is changed by controlling the light emission intensity of the pixel by the pixel signal current.
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Abstract
Description
本実施の形態における画像表示装置は、マトリクス状に配置された複数の発光画素を備え、各発光画素は、発光素子と、コンデンサと、ゲートが当該コンデンサの第1電極に接続されソースが発光素子に接続された駆動素子と、当該駆動素子のソースと当該コンデンサの第2電極との導通及び非導通を切り換える第3スイッチング素子と、参照電源線と当該コンデンサの第1電極との導通及び非導通を切り換える第1スイッチング素子と、データ線と当該コンデンサの第2電極との導通及び非導通を切り換える第2スイッチング素子とを備える。以上の構成により、上記コンデンサの両端電極に、信号電圧に対応した正確な電位を記録することが可能となる。よって、映像信号を反映した高精度な画像表示をすることが可能となる。
本実施の形態における画像表示装置は、マトリクス状に配置された複数の発光画素を備え、各発光画素は、発光素子と、コンデンサと、ゲートが当該コンデンサの第1電極に接続されソースが発光素子に接続された駆動素子と、当該駆動素子のソースと当該コンデンサの第2電極との導通及び非導通を切り換える第3スイッチング素子と、参照電源線と当該コンデンサの第2電極との導通及び非導通を切り換える第1スイッチング素子と、データ線と当該コンデンサの第1電極との導通及び非導通を切り換える第2スイッチング素子とを備える。以上の構成により、上記コンデンサの両端電極に、信号電圧に対応した正確な電位を記録することが可能となる。よって、映像信号を反映した高精度な画像表示をすることが可能となる。
本実施の形態における画像表示装置は、マトリクス状に配置された複数の発光画素を備え、各発光画素は、発光素子と、コンデンサと、ゲートが当該コンデンサの第1電極に接続されソースが発光素子に接続された駆動素子と、当該駆動素子のソースと当該コンデンサの第2電極との導通及び非導通を切り換える第3スイッチング素子と、第1参照電源線と当該コンデンサの第1電極との導通及び非導通を切り換える第1スイッチング素子と、データ線と当該コンデンサの第2電極との導通及び非導通を切り換える第2スイッチング素子と、当該コンデンサの第2電極と第2参照電源線との間に接続された第2コンデンサとを備える。以上の構成により、上記コンデンサの両端電極に、信号電圧に対応した正確な電位を保持することが可能となるとともに、第3スイッチング素子のオン・オフ状態によらず安定な発光が実現される。
2 制御回路
3 メモリ
4 走査線駆動回路
5 信号線駆動回路
6 表示部
10、10A、10B、30、40、50 発光画素
11、11A、11B、12、12A、12B、19、19A、19B、31、32 スイッチングトランジスタ
13、13A、13B、41、41A、41B、51 静電保持容量
14、14A、14B 駆動トランジスタ
15、15A、15B、505 有機EL素子
16、506 信号線
17、17A、17B、17C、18 走査線
20 参照電源線
21 正電源線
22 負電源線
131、131A、131B、132、132A、132B 電極
500 画素部
501 第1スイッチング素子
502 第2スイッチング素子
503 容量素子
504 n型薄膜トランジスタ(n型TFT)
507 第1走査線
508 第2走査線
509 第3スイッチング素子
Claims (18)
- 発光素子と、
電圧を保持するコンデンサと、
ゲート電極が前記コンデンサの第1電極に接続され、ソース電極が前記発光素子の第1電極に接続され、前記コンデンサに保持された電圧に応じたドレイン電流を前記発光素子に流すことにより前記発光素子を発光させる駆動素子と、
前記駆動素子のドレイン電極の電位を決定するための第1電源線と、
前記発光素子の第2電極に電気的に接続された第2電源線と、
前記コンデンサの第1電極の電圧値を規定する参照電圧を供給する第3電源線と、
前記コンデンサの第1電極に前記参照電圧を設定するための第1スイッチング素子と、
前記コンデンサの第2電極に信号電圧を供給するデータ線と、
一方の端子が前記データ線に電気的に接続され、他方の端子が前記コンデンサの第2電極に電気的に接続され、前記データ線と前記コンデンサの第2電極との導通及び非導通を切り換える第2スイッチング素子と、
前記発光素子の第1電極と、前記コンデンサの第2電極とを接続するための第3スイッチング素子と、
前記第1スイッチング素子、前記第2スイッチング素子及び前記第3スイッチング素子を制御する駆動回路とを備え、
前記駆動回路は、
前記第3スイッチング素子をOFFしている間に、前記第1スイッチング素子及び前記第2スイッチング素子をONして前記信号電圧に対応する電圧を前記コンデンサに保持させ、
前記信号電圧に対応する電圧が前記コンデンサに保持された後、前記第1スイッチング素子及び前記第2スイッチング素子をOFFして前記第3スイッチング素子をONする
画像表示装置。 - 前記発光素子の第1電極はアノード電極であり、前記発光素子の第2電極はカソード電極であり、
前記第1電源線の電圧は、前記第2電源線の電圧より高く、前記第1電源線から前記第2電源線に向けて電流が流れる
請求項1に記載の画像表示装置。 - 前記第1スイッチング素子と前記駆動回路とを接続し、前記第1スイッチング素子を制御する信号を前記第1スイッチング素子に伝達する第1走査線と、
前記第2スイッチング素子と前記駆動回路とを接続し、前記第2スイッチング素子を制御する信号を前記第2スイッチング素子に伝達する第2走査線と、
前記第3スイッチング素子と前記駆動回路とを接続し、前記第3スイッチング素子を制御する信号を前記第3スイッチング素子に伝達する第3走査線とを備える
請求項1又は請求項2に記載の画像表示装置。 - 前記第1走査線と前記第2走査線とは共通の走査線である
請求項3に記載の画像表示装置。 - さらに、
第2参照電圧を供給する第4電源線と、
前記コンデンサの第2電極と前記第4電源線との間に設けられた第2コンデンサとを備え、
前記第2コンデンサは、前記第3スイッチング素子がONしている間に前記駆動素子のソース電位を記憶する
請求項1に記載の画像表示装置。 - 前記第3電源線と前記第4電源線とは共通の電源線である
請求項5に記載の表示装置。 - 前記第3電源線と前記第4電源線とは別個の電源線である
請求項5に記載の表示装置。 - 発光素子と、
電圧を保持するコンデンサと、
ゲート電極が前記コンデンサの第1電極に接続され、ソース電極が前記発光素子の第1電極に接続され、前記コンデンサに保持された電圧に応じたドレイン電流を前記発光素子に流すことにより前記発光素子を発光させる駆動素子と、
前記駆動素子のドレイン電極の電位を決定するための第1電源線と、
前記発光素子の第2電極に電気的に接続された第2電源線と、
前記コンデンサの第2電極の電圧値を規定する参照電圧を供給する第3電源線と、
前記コンデンサの第2電極に前記参照電圧を設定するための第1スイッチング素子と、
前記コンデンサの第1電極に信号電圧を供給するデータ線と、
一方の端子が前記データ線に電気的に接続され、他方の端子が前記コンデンサの第1電極に電気的に接続され、前記データ線と前記コンデンサの第1電極との導通及び非導通を切り換える第2スイッチング素子と、
前記発光素子の第1電極と、前記コンデンサの第2電極とを接続するための第3スイッチング素子と、
前記第1スイッチング素子、前記第2スイッチング素子及び前記第3スイッチング素子を制御する駆動回路とを備え、
前記駆動回路は、
前記第3スイッチング素子をOFFしている間に、前記第1スイッチング素子及び前記第2スイッチング素子をONして前記信号電圧に対応する電圧を前記コンデンサに保持させ、
前記信号電圧に対応する電圧が前記コンデンサに保持された後、前記第1スイッチング素子及び前記第2スイッチング素子をOFFして前記第3スイッチング素子をONする
画像表示装置。 - 前記発光素子の第1電極はアノード電極であり、前記発光素子の第2電極はカソード電極であり、
前記第1電源線の電圧は、前記第2電源線の電圧より高く、前記第1電源線から前記第2電源線に向けて電流が流れる
請求項8に記載の画像表示装置。 - 前記第1スイッチング素子と前記駆動回路とを接続し、前記第1スイッチング素子を制御する信号を前記第1スイッチング素子に伝達する第1走査線と、
前記第2スイッチング素子と前記駆動回路とを接続し、前記第2スイッチング素子を制御する信号を前記第2スイッチング素子に伝達する第2走査線と、
前記第3スイッチング素子と前記駆動回路とを接続し、前記第3スイッチング素子を制御する信号を前記第3スイッチング素子に伝達する第3走査線とを備える
請求項8又は請求項9に記載の画像表示装置。 - 前記第1走査線と前記第2走査線とは共通の走査線である
請求項10に記載の画像表示装置。 - さらに、
第2参照電圧を供給する第4電源線と、
前記コンデンサの第2電極と前記第4電源線との間に設けられた第2コンデンサとを備え、
前記第2コンデンサは、前記第3スイッチング素子がONしている間に前記駆動素子のソース電位を記憶する
請求項8に記載の画像表示装置。 - 前記第3電源線と前記第4電源線とは共通の電源線である
請求項12に記載の表示装置。 - 前記第3電源線と前記第4電源線とは別個の電源線である
請求項12に記載の表示装置。 - 複数の画素部を有する画像表示装置であって、
前記複数の画素部の中の隣接する第1画素部と第2画素部とは、それぞれ、
発光素子と、
電圧を保持するコンデンサと、
ゲート電極が前記コンデンサの第1電極に接続され、ソース電極が前記発光素子の第1電極に接続され、前記コンデンサに保持された電圧に応じたドレイン電流を前記発光素子に流すことにより前記発光素子を発光させる駆動素子と、
前記駆動素子のドレイン電極の電位を決定するための第1電源線と、
前記発光素子の第2電極に電気的に接続された第2電源線と、
前記コンデンサの第1電極の電圧値を規定する参照電圧を供給する第3電源線と、
前記コンデンサの第1電極に前記参照電圧を設定するための第1スイッチング素子と、
前記コンデンサの第2電極に信号電圧を供給するデータ線と、
一方の端子が前記データ線に電気的に接続され、他方の端子が前記コンデンサの第2電極に電気的に接続され、前記データ線と前記コンデンサの第2電極との導通及び非導通を切り換える第2スイッチング素子と、
前記発光素子の第1電極と前記コンデンサの第2電極とを接続するための第3スイッチング素子と、
前記第1スイッチング素子を制御する信号を前記第1スイッチング素子に伝達する第1走査線と、
前記第2スイッチング素子を制御する信号を前記第2スイッチング素子に伝達する第2走査線と、
前記第3スイッチング素子を制御する信号を前記第3スイッチング素子に伝達する第3走査線とを備え、
前記画像表示装置は、
前記第1走査線を介して前記第1スイッチング素子に接続され、前記第2走査線を介して前記第2スイッチング素子に接続され、前記第3走査線を介して前記第3スイッチング素子に接続され、前記第1スイッチング素子、前記第2スイッチング素子及び前記第3スイッチング素子を制御する駆動回路を備え、
前記駆動回路は、
前記第3スイッチング素子をOFFしている間に、前記第1スイッチング素子及び前記第2スイッチング素子をONして前記信号電圧に対応する電圧を前記コンデンサに保持させ、
前記信号電圧に対応する電圧が前記コンデンサに保持された後、前記第1スイッチング素子及び前記第2スイッチング素子をOFFして前記第3スイッチング素子をONし、
前記第1画素部に含まれる前記第1走査線と、前記第1画素部に含まれる前記第2走査線と、前記第2画素部に含まれる前記第3走査線とは、前記駆動回路からの共通の走査線から分岐している
画像表示装置。 - 前記発光素子は、有機EL発光素子である
請求項1~請求項15のうちいずれか1項に記載の画像表示装置。 - 発光素子と、
電圧を保持するコンデンサと、
ゲート電極が前記コンデンサの第1電極に接続され、ソース電極が前記発光素子の第1電極に接続され、前記コンデンサに保持された電圧に応じたドレイン電流を前記発光素子に流すことにより前記発光素子を発光させる駆動素子と、
前記駆動素子のドレイン電極の電位を決定するための第1電源線と、
前記発光素子の第2電極に電気的に接続された第2電源線と、
前記コンデンサの第1電極の電圧値を規定する参照電圧を供給する第3電源線と、
前記コンデンサの第1電極に前記参照電圧を設定するための第1スイッチング素子と、
前記コンデンサの第2電極に信号電圧を供給するデータ線と、
一方の端子が前記データ線に電気的に接続され、他方の端子が前記コンデンサの第2電極に電気的に接続され、前記データ線と前記コンデンサの第2電極との導通及び非導通を切り換える第2スイッチング素子と、
前記発光素子の第1電極と前記コンデンサの第2電極とを接続するための第3スイッチング素子とを備えた画像表示装置の制御方法であって、
前記第3スイッチング素子をOFFしている間に、前記第1スイッチング素子及び前記第2スイッチング素子をONして前記信号電圧に対応する電圧を前記コンデンサに保持させる第1ステップと、
前記信号電圧に対応する電圧が前記コンデンサに保持された後、前記第1スイッチング素子及び前記第2スイッチング素子をOFFして前記第3スイッチング素子をONさせる第2ステップとを含む
画像表示装置の制御方法。 - 発光素子と、
電圧を保持するコンデンサと、
ゲート電極が前記コンデンサの第1電極に接続され、ソース電極が前記発光素子の第1電極に接続され、前記コンデンサに保持された電圧に応じたドレイン電流を前記発光素子に流すことにより前記発光素子を発光させる駆動素子と、
前記駆動素子のドレイン電極の電位を決定するための第1電源線と、
前記発光素子の第2電極に電気的に接続された第2電源線と、
前記コンデンサの第2電極の電圧値を規定する参照電圧を供給する第3電源線と、
前記コンデンサの第2電極に前記参照電圧を設定するための第1スイッチング素子と、
前記コンデンサの第1電極に信号電圧を供給するデータ線と、
一方の端子が前記データ線に電気的に接続され、他方の端子が前記コンデンサの第1電極に電気的に接続され、前記データ線と前記コンデンサの第1電極との導通及び非導通を切り換える第2スイッチング素子と、
前記発光素子の第1電極と、前記コンデンサの第2電極とを接続するための第3スイッチング素子とを備えた画像表示装置の制御方法であって、
前記第3スイッチング素子をOFFしている間に、前記第1スイッチング素子及び前記第2スイッチング素子をONして前記信号電圧に対応する電圧を前記コンデンサに保持させる第1ステップと、
前記信号電圧に対応する電圧が前記コンデンサに保持された後、前記第1スイッチング素子及び前記第2スイッチング素子をOFFして前記第3スイッチング素子をONさせる第2ステップとを含む
画像表示装置の制御方法。
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JP2011175274A (ja) | 2011-09-08 |
EP2613305B1 (en) | 2017-02-22 |
US8248331B2 (en) | 2012-08-21 |
US8018404B2 (en) | 2011-09-13 |
JP5555656B2 (ja) | 2014-07-23 |
JP4719821B2 (ja) | 2011-07-06 |
US8749454B2 (en) | 2014-06-10 |
CN101842829A (zh) | 2010-09-22 |
JPWO2010041426A1 (ja) | 2012-03-01 |
US20110164024A1 (en) | 2011-07-07 |
EP2226786B1 (en) | 2016-04-13 |
JP2011175275A (ja) | 2011-09-08 |
EP2226786A4 (en) | 2010-11-17 |
EP2226786A1 (en) | 2010-09-08 |
US20100259531A1 (en) | 2010-10-14 |
JP2011164641A (ja) | 2011-08-25 |
KR101091439B1 (ko) | 2011-12-07 |
CN101842829B (zh) | 2013-03-06 |
EP2613305A1 (en) | 2013-07-10 |
US20110285760A1 (en) | 2011-11-24 |
KR20100057890A (ko) | 2010-06-01 |
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