WO2014103500A1 - 表示装置、表示装置の駆動方法、及び、電子機器 - Google Patents
表示装置、表示装置の駆動方法、及び、電子機器 Download PDFInfo
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- WO2014103500A1 WO2014103500A1 PCT/JP2013/079443 JP2013079443W WO2014103500A1 WO 2014103500 A1 WO2014103500 A1 WO 2014103500A1 JP 2013079443 W JP2013079443 W JP 2013079443W WO 2014103500 A1 WO2014103500 A1 WO 2014103500A1
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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
- G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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- 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
- 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
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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- 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
- G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
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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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- 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
- G09G2310/08—Details of timing specific for flat panels, other than clock recovery
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
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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]
- G09G3/3266—Details of drivers for scan electrodes
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
Definitions
- the present disclosure relates to a display device, a driving method of the display device, and an electronic device, and in particular, a planar (flat panel type) display device in which pixels including light emitting units are arranged in a matrix (matrix shape),
- the present invention relates to a display device driving method and an electronic device including the display device.
- a display device using a so-called current-driven electro-optic element as a light-emitting portion of a pixel, in which light emission luminance changes in accordance with a current value flowing through a light-emitting portion (light-emitting element).
- a current-driven electro-optical element for example, an organic EL element using a phenomenon in which light is emitted when an electric field is applied to an organic thin film using electroluminescence (EL) of an organic material is known.
- a P-channel transistor is used as a drive transistor for driving a light emitting portion by a pixel circuit, and variations in threshold voltage and mobility of the drive transistor are reduced. Some have the function of correcting.
- This pixel circuit includes a sampling transistor, a switching transistor, a storage capacitor, and an auxiliary capacitor in addition to the driving transistor (see, for example, Patent Document 1).
- An object of the present disclosure is to provide a display device capable of reliably controlling a light emitting unit to be in a non-light emitting state during a non-light emitting period, a driving method of the display device, and an electronic apparatus having the display device. To do.
- a method for driving a display device includes: A P-channel type driving transistor for driving the light emitting section; Sampling transistor for sampling the signal voltage, A light emission control transistor for controlling light emission / non-light emission of the light emitting unit; A storage capacitor connected between the gate electrode and the source electrode of the driving transistor and holding a signal voltage written by sampling by the sampling transistor; and
- a display device in which a pixel circuit having an auxiliary capacitor connected between a source electrode of a driving transistor and a node of a fixed potential is arranged, This is a method for driving a display device in which a current flowing through a driving transistor is allowed to flow into a predetermined node during a non-light emitting period of a light emitting unit.
- an electronic device of the present disclosure is provided.
- An electronic apparatus having a display device including a current path through which a current flowing through a driving transistor flows into a predetermined node during a non-light emitting period of a light emitting unit.
- the current flowing in the driving transistor is caused to flow into the predetermined node to flow into the light emitting unit. Can prevent current from flowing in. Thereby, it can suppress that a light emission part light-emits in a non-light-emission period.
- the present disclosure it is possible to reliably control the light emitting unit to be in a non-light emitting state during the non-light emitting period and to suppress the light emission of the light emitting unit during the non-light emitting period, thereby achieving high contrast of the display panel. .
- FIG. 1 is a system configuration diagram illustrating an outline of a basic configuration of an active matrix display device as a premise of the present disclosure.
- FIG. 2 is a circuit diagram illustrating a circuit example of a pixel (pixel circuit) in an active matrix display device that is a premise of the present disclosure.
- FIG. 3 is a timing waveform diagram for explaining the circuit operation of the active matrix display device as a premise of the present disclosure.
- FIG. 4 is a circuit diagram illustrating a circuit example of a pixel (pixel circuit) according to the first embodiment.
- FIG. 5 is a timing waveform chart for explaining the circuit operation of the active matrix display device including the pixel according to the first embodiment.
- FIG. 1 is a system configuration diagram illustrating an outline of a basic configuration of an active matrix display device as a premise of the present disclosure.
- FIG. 2 is a circuit diagram illustrating a circuit example of a pixel (pixel circuit) in an active matrix display device that is a premise of the present disclosure.
- Examples of flat display devices include organic EL display devices, liquid crystal display devices, and plasma display devices.
- the organic EL display device uses an organic EL element using a phenomenon in which light is emitted when an electric field is applied to an organic thin film using electroluminescence of an organic material as a light emitting element (electro-optical element) of a pixel. ing.
- An organic EL display device using an organic EL element as a light emitting portion of a pixel has the following features. That is, since the organic EL element can be driven with an applied voltage of 10 V or less, the organic EL display device has low power consumption. Since the organic EL element is a self-luminous element, the organic EL display device has higher image visibility than a liquid crystal display device that is the same flat display device, and an illumination member such as a backlight. Therefore, it is easy to reduce the weight and thickness. Furthermore, since the response speed of the organic EL element is as high as several usec, the organic EL display device does not generate an afterimage when displaying a moving image.
- the current path is configured to flow the current flowing in the driving transistor to the cathode electrode node of the light emitting unit. Can do.
- a switching transistor is connected between the drain electrode of the driving transistor and the node of the cathode electrode of the light emitting unit, and the switching transistor is made conductive during the non-light emitting period of the light emitting unit. it can.
- the switching transistor is driven by a signal different from the signal for driving the sampling transistor. be able to.
- the period from the timing when the signal for driving the light emission control transistor becomes active to the timing when the signal for driving the sampling transistor becomes active, or the signal for driving the light emission control transistor It can be set as a period from the timing when it becomes active to the timing when the signal for driving the switching transistor becomes active.
- the start of quenching of the light emitting unit can be determined by the timing at which the signal for driving the sampling transistor or the signal for driving the switching transistor becomes active.
- the sampling transistor, the light emission control transistor, and the switching transistor are the same P-channel type as the driving transistor.
- a structure including a transistor can be employed.
- an active matrix organic EL that uses, for example, an organic EL element, which is a current-driven electro-optical element whose emission luminance changes according to the current value flowing through the device, as a light emitting portion (light emitting element) of a pixel circuit.
- an organic EL element which is a current-driven electro-optical element whose emission luminance changes according to the current value flowing through the device, as a light emitting portion (light emitting element) of a pixel circuit.
- the “pixel circuit” may be simply referred to as “pixel”.
- an organic EL display device 10 as a premise of the present disclosure includes a pixel array unit 30 in which a plurality of pixels 20 including organic EL elements are two-dimensionally arranged in a matrix, and the pixel array unit 30. It has the structure which has a drive circuit part (drive part) arrange
- the driving circuit unit includes, for example, a writing scanning unit 40, a driving scanning unit 50, a signal output unit 60, and the like mounted on the same display panel 70 as the pixel array unit 30, and each pixel 20 of the pixel array unit 30 is arranged. To drive. It is also possible to adopt a configuration in which some or all of the writing scanning unit 40, the driving scanning unit 50, and the signal output unit 60 are provided outside the display panel 70.
- one pixel (unit pixel / pixel) as a unit for forming a color image is composed of a plurality of sub-pixels (sub-pixels).
- each of the sub-pixels corresponds to the pixel 20 in FIG.
- one pixel includes, for example, a sub-pixel that emits red (Red) light, a sub-pixel that emits green (G) light, and blue (Blue).
- one pixel is not limited to a combination of RGB three primary color subpixels, and one pixel may be configured by adding one or more color subpixels to the three primary color subpixels. Is possible. More specifically, for example, one pixel is formed by adding a sub-pixel that emits white (W) light to improve luminance, or at least emits complementary color light to expand the color reproduction range. It is also possible to configure one pixel by adding one subpixel.
- W white
- the pixel array section 30 includes scanning lines 31 (31 1 to 31 m ) and drive lines along the row direction (pixel arrangement direction / horizontal direction of pixels in the pixel row) with respect to the arrangement of the pixels 20 in m rows and n columns.
- 32 32 1 to 32 m
- signal lines 33 33 1 to 33 n
- the write scanning unit 40 is configured by a shift register circuit or the like.
- the writing scanning unit 40 writes the writing scanning signal WS (WS 1 to WS m ) to the scanning lines 31 (31 1 to 31 m ) when writing the signal voltage of the video signal to each pixel 20 of the pixel array unit 30. Is sequentially supplied, so that each pixel 20 of the pixel array unit 30 is sequentially scanned row by row, so-called line sequential scanning is performed.
- the drive scanning unit 50 is configured by a shift register circuit or the like, similarly to the writing scanning unit 40.
- the drive scanning unit 50 supplies the light emission control signals DS (DS 1 to DS m ) to the drive lines 32 (32 1 to 32 m ) in synchronization with the line sequential scanning performed by the writing scanning unit 40. 20 light emission / non-light emission (quenching) is controlled.
- the signal output unit 60 includes a signal voltage V sig of a video signal corresponding to luminance information supplied from a signal supply source (not shown) (hereinafter sometimes simply referred to as “signal voltage”) and a first reference voltage.
- V ref and the second reference voltage V ofs are selectively output.
- the first reference voltage V ref is a reference voltage for surely extinguishing the light emitting portion (organic EL element) of the pixel 20.
- the second reference voltage V ofs is a voltage that serves as a reference for the signal voltage V sig of the video signal (for example, a voltage corresponding to the black level of the video signal), and is used when a threshold correction operation described later is performed.
- the signal voltage V sig / first reference voltage V ref / second reference voltage V ofs alternatively output from the signal output unit 60 is supplied to the pixel array unit 30 via the signal line 33 (33 1 to 33 n ).
- Each pixel 20 is written in units of pixel rows selected by scanning by the writing scanning unit 40. That is, the signal output unit 60 adopts a line sequential writing driving form in which the signal voltage V sig is written in units of rows (lines).
- FIG. 2 is a circuit diagram illustrating a circuit example of a pixel (pixel circuit) in an active matrix display device as a premise of the present disclosure, that is, an active matrix display device according to a conventional example.
- the light emitting part of the pixel 20 A is composed of an organic EL element 21.
- the organic EL element 21 is an example of a current-driven electro-optical element whose emission luminance changes according to the value of current flowing through the device.
- the pixel 20 A includes an organic EL element 21 and a drive circuit that drives the organic EL element 21 by causing a current to flow through the organic EL element 21.
- the organic EL element 21 has a cathode electrode connected to a common power supply line 34 that is wired in common to all the pixels 20.
- the drive circuit for driving the organic EL element 21 has a configuration including a drive transistor 22, a sampling transistor 23, a light emission control transistor 24, a storage capacitor 25, and an auxiliary capacitor 26. Note that it is assumed that a P-channel transistor is used as the drive transistor 22 on the assumption that it is formed on a semiconductor such as silicon instead of an insulator such as a glass substrate.
- the sampling transistor 23 and the light emission control transistor 24 are assumed to be formed on a semiconductor, and a configuration using P-channel transistors is employed. Therefore, the drive transistor 22, the sampling transistor 23, and the light emission control transistor 24 have four terminals of source / gate / drain / back gate instead of three terminals of source / gate / drain. A power supply voltage Vcc is applied to the back gate.
- the sampling transistor 23 writes the signal voltage V sig supplied from the signal output unit 60 through the signal line 33 to the storage capacitor 25 by sampling.
- the light emission control transistor 24 is connected between the power supply node of the power supply voltage Vcc and the source electrode of the drive transistor 22 and controls light emission / non-light emission of the organic EL element 21 under the drive by the light emission control signal DS.
- the storage capacitor 25 is connected between the gate electrode and the source electrode of the drive transistor 22.
- the holding capacitor 25 holds the signal voltage V sig written by sampling by the sampling transistor 23.
- the driving transistor 22 drives the organic EL element 21 by causing a driving current corresponding to the holding voltage of the holding capacitor 25 to flow through the organic EL element 21.
- the auxiliary capacitor 26 is connected between the source electrode of the drive transistor 22 and a node of a fixed potential, for example, a power supply node of the power supply voltage cc .
- the auxiliary capacitor 26 suppresses the fluctuation of the source potential of the driving transistor 22 when the signal voltage V sig is written, and the gate-source voltage V gs of the driving transistor 22 is changed to the threshold voltage V th of the driving transistor 22. Make the action.
- sampling transistor 23 and the light emission control transistor 24 are P-channel type, the low potential state of the write scanning signal WS and the light emission control signal DS becomes the active state, and the high potential state becomes the inactive state.
- the sampling transistor 23 and the light emission control transistor 24 are in a conductive state when the write scanning signal WS and the light emission control signal DS are active, and are in a nonconductive state when inactive.
- the end of the light emission period of the pixel 20 A is determined at a timing (time t 8 ) at which the potential WS of the scanning line 31 changes from a high potential to a low potential and the sampling transistor 23 becomes conductive. .
- the potential WS of the scanning line 31 transitions from a high potential to a low potential, whereby the drive transistor 22 Since the gate-source voltage V gs becomes equal to or lower than the threshold voltage V th of the drive transistor 22, the drive transistor 22 is cut off.
- the potential WS of the scanning line 31 transitions from a high potential to a low potential, so that the sampling transistor 23 becomes conductive.
- the gate potential V g of the drive transistor 22 becomes the second reference voltage V ofs .
- the potential DS of the drive line 32 is in a low potential state, and the light emission control transistor 24 is in a conductive state, so that the source potential V s of the drive transistor 22 becomes the power supply voltage V cc .
- the initialization operation for setting the gate potential V g of the driving transistor 22 to the second reference voltage V ofs and setting the source potential V s of the driving transistor 22 to the power supply voltage V cc is the next threshold correction.
- This is a preparation operation (threshold correction preparation) before the operation is performed. Therefore, the second reference voltage V ofs and the power supply voltage V cc are the initialization voltages of the gate potential V g and the source potential V s of the driving transistor 22.
- the source potential V s of the drive transistor 22 becomes floating, and the drive transistor 22
- the threshold value correction operation is started in a state where the gate potential V g of the second voltage is maintained at the second reference voltage V ofs . That is, the source potential V s of the drive transistor 22 starts to decrease (decrease) toward the potential (V g ⁇ V th ) obtained by subtracting the threshold voltage V th from the gate potential V g of the drive transistor 22.
- the gate-source voltage V gs of the drive transistor 22 opens (increases) in accordance with the signal voltage V sig , but the source potential V s of the drive transistor 22 is still in a floating state. Therefore, the charge stored in the storage capacitor 25 is discharged according to the characteristics of the drive transistor 22. At this time, charging of the equivalent capacitance Cel of the organic EL element 21 is started by the current flowing through the drive transistor 22.
- the decrease in the source potential V s of the drive transistor 22 acts to discharge the charge stored in the storage capacitor 25.
- the negative feedback is applied to the storage capacitor 25 for the decrease (change amount) of the source potential V s of the drive transistor 22. Accordingly, the amount of decrease in the source potential V s of the drive transistor 22 becomes a feedback amount of negative feedback.
- the drain-source current I ds of the driving transistor 22 starts to flow through the organic EL element 21, whereby the anode potential V ano of the organic EL element 21 rises according to the current I ds .
- the anode potential V ano of the organic EL element 21 exceeds the threshold voltage V thEL of the organic EL element 21, to begin driving current flows to the organic EL element 21, the organic EL element 21 starts emitting light.
- this driving method is only an example and is not limited to this driving method.
- so-called divided threshold correction is performed in which threshold correction is performed a plurality of times by being divided over a plurality of horizontal periods preceding the 1H period. It is also possible to adopt a driving method.
- a current flows through the drive transistor 22, and as shown in the timing waveform diagram of FIG. 3, the anode potential V ano of the organic EL element 21 is temporarily changed from the threshold correction preparation period to a part of the threshold correction period.
- the threshold voltage V thel of the EL element 21 is exceeded.
- a current flows from the drive transistor 22 to the organic EL element 21, so that the light emitting section (organic) has a constant luminance every frame regardless of the gradation of the signal voltage V sig in spite of the non-light emitting period.
- the EL element 21) emits light. As a result, the contrast of the display panel 70 is reduced.
- the embodiment of the present disclosure is characterized by adopting a configuration including a current path for flowing a current flowing through the drive transistor 22 to a predetermined node during a non-light-emitting period of the organic EL element 21 that is a light emitting unit. That is, the current flowing through the drive transistor 22 during the non-light emission period is forced to flow into a predetermined node through the current path.
- FIG. 4 is a circuit diagram illustrating a circuit example of a pixel (pixel circuit) according to the first embodiment.
- the same elements or elements having the same functions as those in FIG. 2 are denoted by the same reference numerals.
- the pixel 20 B includes circuit elements that constitute a circuit that drives the organic EL element 21, that is, a drive transistor 22, a sampling transistor 23, a light emission control transistor 24, a storage capacitor 25, In addition to the auxiliary capacitor 26, a current path 80 is provided.
- the threshold correction operation is performed at a higher speed. Can do. As a result, the variation of the threshold voltage V th of the drive transistor 22 from pixel to pixel can be corrected more reliably, and the drive timing margin can be increased.
- FIG. 13 is a timing waveform diagram focusing on the light emission transition period before and after burn-in.
- the broken line indicates the waveform after deterioration
- the solid line indicates the waveform before deterioration.
- the contrast of the display panel 70 is defined by the black light emission luminance with respect to the white light emission luminance. Since the signal voltage V sig of the video signal during black light emission is very small, the drain-source current I ds of the drive transistor 22 during the mobility correction period is very small, and the organic EL element 21 of the organic EL element 21 during the mobility correction period. never anode potential V ano reaches the light emission threshold voltage V thEL. Accordingly, since the influence on the black light emission luminance can be ignored, there is no reduction in contrast.
- FIG. 14 is a timing waveform diagram focusing on the light emission transition period before and after the deterioration of the organic EL element 21.
- the broken line shows the waveform after deterioration
- the solid line shows the waveform before deterioration.
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Abstract
Description
発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成り、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込む電流経路を備える表示装置である。
発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成る表示装置の駆動に当たって、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込むようにする表示装置の駆動方法である。
発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成り、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込む電流経路を備える表示装置を有する電子機器である。
1.本開示の表示装置、表示装置の駆動方法、及び、電子機器、全般に関する説明
2.本開示の前提となるアクティブマトリクス型表示装置
2-1.システム構成
2-2.画素回路
2-3.基本的な回路動作
2-4.閾値補正準備期間~閾値補正期間での不具合について
3.実施形態の説明
3-1.実施例1
3-2.実施例2
3-3.実施例3
3-4.実施例4
4.適用例
5.電子機器
本開示の表示装置は、発光部を駆動するPチャネル型の駆動トランジスタの他に、サンプリングトランジスタ、発光制御トランジスタ、保持容量、及び、補助容量を有する画素回路が配置されて成る平面型(フラットパネル型)の表示装置である。
[2-1.システム構成]
図1は、本開示の前提となるアクティブマトリクス型表示装置の基本的な構成の概略を示すシステム構成図である。本開示の前提となるアクティブマトリクス型表示装置は、特許文献1に記載の従来例に係るアクティブマトリクス型表示装置でもある。
図2は、本開示の前提となるアクティブマトリクス型表示装置、即ち、従来例に係るアクティブマトリクス型表示装置における画素(画素回路)の回路例を示す回路図である。画素20Aの発光部は、有機EL素子21から成る。有機EL素子21は、デバイスに流れる電流値に応じて発光輝度が変化する電流駆動型の電気光学素子の一例である。
続いて、上記構成の本開示の前提となるアクティブマトリクス型有機EL表示装置10の基本的な回路動作について、図3のタイミング波形図を用いて説明する。
ここで、閾値補正準備期間から閾値補正期間(時刻t1~時刻t3)にかけての動作点に着目する。先述した動作説明から明らかなように、閾値補正動作を行うには、駆動トランジスタ22のゲート-ソース間電圧Vgsを、当該駆動トランジスタ22の閾値電圧Vthよりも大きくしておく必要がある。
そこで、本開示の実施形態では、発光部である有機EL素子21の非発光期間に、駆動トランジスタ22に流れる電流を所定のノードに流し込む電流経路を備える構成を採ることを特徴としている。すなわち、当該電流経路を通して、非発光期間に駆動トランジスタ22に流れる電流を所定のノードに強制的に流し込むようにする。
図4は、実施例1に係る画素(画素回路)の回路例を示す回路図であり、図中、図2と同一要素又は同一機能を有する要素には同一符号を付して示している。
図6は、実施例2に係る画素(画素回路)の回路例を示す回路図であり、図中、図2と同一要素又は同一機能を有する要素には同一符号を付して示している。
実施例3は、画素20の回路構成の点、及び、スイッチングトランジスタ27の駆動信号として駆動信号AZを用いる点で実施例2と同じであり、実施例2とは、駆動信号AZの波形(タイミング関係)の点で異なっている。具体的には、図8のタイミング波形図に示すように、駆動信号AZは、時刻t6と時刻t7の間の時刻t21から、時刻t8よりも前の時刻t22までの期間だけ非アクティブ状態となる信号となっている。
実施例4は、実施例3の場合と同様に、画素20の回路構成の点、及び、スイッチングトランジスタ27の駆動信号として駆動信号AZを用いる点で実施例2と同じである。そして、実施例2とは、駆動信号AZの波形(タイミング関係)の点で異なっている。具体的には、図9のタイミング波形図に示すように、信号書込み期間に入る時刻t5よりも前に駆動信号AZが非アクティブ状態となる、換言すれば、スイッチングトランジスタ27が非導通状態となるタイミング関係となっている。駆動信号AZがアクティブ状態となるタイミングについては、実施例2の場合のように、書込み走査信号WSがアクティブ状態となる時刻t8よりも後であってもよいし、実施例3の場合のように、時刻t8よりも前であってもよい。
ΔVgs=Cp/(Cs+Cp)×ΔVoled ・・・(1)
そして、最終的に、駆動トランジスタ22のドレイン-ソース間電流Idsが減少したところで駆動トランジスタ22が飽和状態となり、発光期間に入る。
Ids=(1/2)×uCox×W/L×(Vgs)2 ・・・(2)
ここで、Wは駆動トランジスタ22のチャネル幅、Lはチャネル長、Coxは単位面積当たりのゲート容量である。
Vgs=│Vsig-Vofs│×Csub/(Cs+Csub)+Vth
=a×│Vsig-Vofs│+Vth ・・・(3)
Ids=1/2×uCox×W/L×{a×│Vsig-Vofs│}2 ・・・(4)
本開示の技術は、上述した実施形態に限定されるものではなく、本開示の要旨を逸脱しない範囲内で種々の変形、改変が可能である。例えば、上記の実施形態では、画素20を構成するPチャネル型のトランジスタをシリコンのような半導体上に形成して成る表示装置に適用した場合を例に挙げて説明したが、画素20を構成するPチャネル型のトランジスタをガラス基板のような絶縁体上に形成して成る表示装置に対しても、本開示の技術を適用することができる。
以上説明した本開示の表示装置は、電子機器に入力された映像信号、若しくは、電子機器内で生成した映像信号を、画像若しくは映像として表示するあらゆる分野の電子機器において、その表示部(表示装置)として用いることが可能である。
[1]発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成り、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込む電流経路を備える表示装置。
[2]電流経路は、駆動トランジスタに流れる電流を発光部のカソード電極のノードに流し込む上記[1]に記載の表示装置。
[3]電流経路は、駆動トランジスタのドレイン電極と発光部のカソード電極のノードとの間に接続され、発光部の非発光期間に導通状態になるスイッチングトランジスタを有する上記[2]に記載の表示装置。
[4]スイッチングトランジスタは、サンプリングトランジスタを駆動する信号によって駆動される上記[3]に記載の表示装置。
[5]スイッチングトランジスタは、サンプリングトランジスタを駆動する信号とは異なる信号によって駆動される上記[3]に記載の表示装置。
[6]発光部の発光期間は、発光制御トランジスタを駆動する信号がアクティブになるタイミングから、サンプリングトランジスタを駆動する信号がアクティブになるタイミングまでの期間として設定される上記[4]または上記[5]に記載の表示装置。
[7]発光部の発光期間は、発光制御トランジスタを駆動する信号がアクティブになるタイミングから、スイッチングトランジスタを駆動する信号がアクティブになるタイミングまでの期間として設定される上記[5]に記載の表示装置。
[8]スイッチングトランジスタを駆動する信号は、サンプリングトランジスタによる信号電圧の書込み期間に入る前に非アクティブ状態となる上記[5]又は上記[7]に記載の表示装置。
[9]サンプリングトランジスタ、発光制御トランジスタ、及び、スイッチングトランジスタは、Pチャネル型のトランジスタから成る上記[1]から上記[8]のいずれかに記載の表示装置。
[10]画素回路は、駆動トランジスタのゲート電位の初期化電位を基準として当該初期化電位から駆動トランジスタの閾値電圧を減じた電位に向けて、駆動トランジスタのソース電位を変化させる動作を行う上記[1]から上記[9]のいずれかに記載の表示装置。
[11]画素回路は、サンプリングトランジスタによって信号電圧を書き込む期間において、駆動トランジスタに流れる電流に応じた帰還量で保持容量に対して負帰還をかける動作を行う上記[1]から上記[10]のいずれかに記載の表示装置。
[12]発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成る表示装置の駆動に当たって、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込むようにする表示装置の駆動方法。
[13]発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成り、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込む電流経路を備える表示装置を有する電子機器。
Claims (13)
- 発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成り、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込む電流経路を備える表示装置。 - 電流経路は、駆動トランジスタに流れる電流を発光部のカソード電極のノードに流し込む請求項1に記載の表示装置。
- 電流経路は、駆動トランジスタのドレイン電極と発光部のカソード電極のノードとの間に接続され、発光部の非発光期間に導通状態になるスイッチングトランジスタを有する請求項2に記載の表示装置。
- スイッチングトランジスタは、サンプリングトランジスタを駆動する信号によって駆動される請求項3に記載の表示装置。
- スイッチングトランジスタは、サンプリングトランジスタを駆動する信号とは異なる信号によって駆動される請求項3に記載の表示装置。
- 発光部の発光期間は、発光制御トランジスタを駆動する信号がアクティブになるタイミングから、サンプリングトランジスタを駆動する信号がアクティブになるタイミングまでの期間として設定される請求項4に記載の表示装置。
- 発光部の発光期間は、発光制御トランジスタを駆動する信号がアクティブになるタイミングから、スイッチングトランジスタを駆動する信号がアクティブになるタイミングまでの期間として設定される請求項5に記載の表示装置。
- スイッチングトランジスタを駆動する信号は、サンプリングトランジスタによる信号電圧の書込み期間に入る前に非アクティブ状態となる請求項5に記載の表示装置。
- サンプリングトランジスタ、発光制御トランジスタ、及び、スイッチングトランジスタは、Pチャネル型のトランジスタから成る請求項1に記載の表示装置。
- 画素回路は、駆動トランジスタのゲート電位の初期化電位を基準として当該初期化電位から駆動トランジスタの閾値電圧を減じた電位に向けて、駆動トランジスタのソース電位を変化させる動作を行う請求項1に記載の表示装置。
- 画素回路は、サンプリングトランジスタによって信号電圧を書き込む期間において、駆動トランジスタに流れる電流に応じた帰還量で保持容量に対して負帰還をかける動作を行う請求項1に記載の表示装置。
- 発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成る表示装置の駆動に当たって、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込むようにする表示装置の駆動方法。 - 発光部を駆動するPチャネル型の駆動トランジスタ、
信号電圧をサンプリングするサンプリングトランジスタ、
発光部の発光/非発光を制御する発光制御トランジスタ、
駆動トランジスタのゲート電極とソース電極との間に接続され、サンプリングトランジスタによるサンプリングによって書き込まれた信号電圧を保持する保持容量、及び、
駆動トランジスタのソース電極と固定電位のノードとの間に接続された補助容量を有する画素回路が配置されて成り、
発光部の非発光期間に駆動トランジスタに流れる電流を所定のノードに流し込む電流経路を備える表示装置を有する電子機器。
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KR (1) | KR102079839B1 (ja) |
CN (2) | CN111105751B (ja) |
TW (1) | TW201426709A (ja) |
WO (1) | WO2014103500A1 (ja) |
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Also Published As
Publication number | Publication date |
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KR20150098616A (ko) | 2015-08-28 |
CN111105751A (zh) | 2020-05-05 |
JP2018116303A (ja) | 2018-07-26 |
CN104871233B (zh) | 2020-02-14 |
CN104871233A (zh) | 2015-08-26 |
US20180254008A1 (en) | 2018-09-06 |
TW201426709A (zh) | 2014-07-01 |
US10909919B2 (en) | 2021-02-02 |
KR102079839B1 (ko) | 2020-02-20 |
CN111105751B (zh) | 2023-09-26 |
JP6311613B2 (ja) | 2018-04-18 |
US20160307499A1 (en) | 2016-10-20 |
JPWO2014103500A1 (ja) | 2017-01-12 |
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