WO2016072139A1 - 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
- Publication number
- WO2016072139A1 WO2016072139A1 PCT/JP2015/074700 JP2015074700W WO2016072139A1 WO 2016072139 A1 WO2016072139 A1 WO 2016072139A1 JP 2015074700 W JP2015074700 W JP 2015074700W WO 2016072139 A1 WO2016072139 A1 WO 2016072139A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- transistor
- signal
- display device
- writing
- Prior art date
Links
Images
Classifications
-
- 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
- G09G3/3258—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 voltage across the light-emitting element
-
- 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
-
- 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
-
- 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
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
- G09G2300/0426—Layout of electrodes and connections
-
- 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
-
- 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
- G09G2300/0866—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 by means of changes in the pixel supply voltage
-
- 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
- G09G2310/0245—Clearing or presetting the whole screen independently of waveforms, e.g. on power-on
-
- 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
-
- 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
-
- 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
- G09G2310/0264—Details of driving circuits
- G09G2310/0281—Arrangement of scan or data electrode driver circuits at the periphery of a panel not inherent to a split matrix structure
-
- 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
- G09G2310/0264—Details of driving circuits
- G09G2310/0283—Arrangement of drivers for different directions of scanning
-
- 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
-
- 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
- G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
-
- 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
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
Definitions
- the present disclosure relates to a display device, a display device driving method, and an electronic apparatus.
- the display device has a function of correcting display unevenness caused by variation in characteristics of drive transistors that drive the light emitting unit. Then, the correction operation is performed during a period in which the writing transistor for writing the video signal is in a conductive state. The correction period for performing this correction operation is determined by the capacitance value of the pixel capacitance (capacity of the pixel).
- a correction period (correction time) is required to be shortened as the source voltage of the driving transistor fluctuates during the correction operation.
- This correction period is determined by the pulse width of the drive pulse for driving the write transistor. Therefore, the correction period can be shortened by making the drive pulse shorter. Therefore, conventionally, a pulse width adjusting circuit is formed on the display panel, and a pulse signal with a reduced pulse width is generated based on a pulse signal input from the outside and used as a driving pulse (for example, a patent) Reference 1).
- Patent Document 1 requires that a pulse width adjustment circuit for generating a drive pulse with a short pulse width be formed on the display panel, which increases the circuit scale of the peripheral circuit that drives the pixel circuit. To do. As a result, the area of the peripheral circuit area of the pixel array portion in which the peripheral circuits on the display panel are arranged, that is, the so-called frame area is increased, which hinders the downsizing of the display panel.
- the present disclosure eliminates the need for shortening the pulse width of the drive pulse and enables a reduction in the circuit scale of the peripheral circuit of the pixel array unit, a display device drive method, and an electronic apparatus including the display device.
- the purpose is to provide.
- a display device of the present disclosure of the present disclosure is provided.
- a pixel circuit including an auxiliary capacitor having one end connected to the source node is arranged in a matrix, The pixel circuit has a function of threshold correction processing for changing the source voltage of the drive transistor toward a voltage obtained by subtracting the threshold voltage of the drive transistor from the initialization voltage with reference to the initialization voltage of the gate voltage of the drive transistor.
- an electronic apparatus includes the display device having the above structure.
- a method for driving a display device includes A light emitting unit, a writing transistor for writing a signal voltage of a video signal, a holding capacitor for holding the signal voltage written by the writing transistor, a driving transistor for driving the light emitting unit based on the signal voltage held by the holding capacitor, and a driving transistor
- a pixel circuit including an auxiliary capacitor having one end connected to the source node is arranged in a matrix, The pixel circuit has a function of threshold correction processing for changing the source voltage of the drive transistor toward a voltage obtained by subtracting the threshold voltage of the drive transistor from the initialization voltage with reference to the initialization voltage of the gate voltage of the drive transistor.
- the driving transistor When the signal voltage is written by the writing transistor after threshold correction processing in the display device, the driving method of the display device, or the electronic device having the above structure, the driving transistor is naturally driven by the cut-off region when the signal voltage is written. No current flows through the transistor. As a result, it is possible to eliminate factors that cause the source voltage of the driving transistor to fluctuate other than the coupling associated with the writing of the signal voltage. Accordingly, it is not necessary to shorten the correction period (correction time), so that it is not necessary to shorten the drive pulse.
- FIG. 1 is a system configuration diagram illustrating an outline of a basic configuration of an active matrix organic EL display device which is a premise of the present disclosure.
- FIG. 2 is a circuit diagram showing a circuit configuration of a unit pixel (pixel circuit) of 2Tr2C.
- FIG. 3 is a timing waveform diagram for explaining a basic circuit operation in an ideal state of the active matrix organic EL display device as a premise of the present disclosure.
- FIG. 4 is a waveform diagram for explaining the operation of mobility correction.
- FIG. 4A shows an operation example when the current supply capability of the driving transistor is large and the capacitance value of the pixel capacitor is small
- FIG. 4B shows the movement. An example of operation when the degree correction time is shortened will be described.
- FIG. 4A shows an operation example when the current supply capability of the driving transistor is large and the capacitance value of the pixel capacitor is small
- FIG. 4B shows the movement. An example of operation when the degree correction time is shortened will be described.
- FIG. 5 is a circuit diagram showing a configuration example of a pulse width adjustment circuit in the peripheral circuit of the pixel array section.
- FIG. 6 is a timing waveform diagram showing waveforms of signals at various parts in FIG.
- FIG. 7 is a system configuration diagram illustrating an outline of a configuration of an organic EL display device including the pixel circuit according to the first embodiment.
- FIG. 8 is a timing waveform diagram for explaining the circuit operation of the organic EL display device including the pixel circuit according to the first embodiment.
- FIG. 9 is a system configuration diagram illustrating an outline of a configuration of an organic EL display device including the pixel circuit according to the second embodiment.
- FIG. 10 is a timing waveform diagram for explaining the circuit operation of the organic EL display device including the pixel circuit according to the second embodiment.
- FIG. 11 is an external view of a lens interchangeable single-lens reflex digital camera.
- FIG. 11A shows a front view thereof
- FIG. 11B shows a rear view thereof.
- FIG. 12 is
- Example 1 (example in which the pixel circuit is formed of an N-channel transistor) 3-2.
- Example 2 (example in which the pixel circuit is formed of a P-channel transistor) 4).
- Electronic equipment 4-1 Specific example 1 (example of digital camera) 4-2.
- Example 2 (example of head mounted display)
- the control unit has a configuration in which the potential of the source electrode of the driving transistor is changed by applying a potential change to the other end of the auxiliary capacitor. be able to.
- the control unit applies the control signal to the other end of the auxiliary capacitor through the control line to the source electrode of the drive transistor by switching from the inactive state to the active state.
- a configuration in which a potential change is given can be employed.
- the display device the display device driving method, and the electronic device including the preferable configuration described above, at least the source voltage of the driving transistor when a potential change is applied to the source electrode of the driving transistor.
- the writing transistor can be configured to write a signal voltage to the gate electrode of the driving transistor after a potential change is given to the source electrode of the driving transistor.
- the display device, the display device driving method, and the electronic device according to the present disclosure may include a writing scanning unit that drives the writing transistor in units of rows through the scanning line. it can.
- the control unit and the write scanning unit are preferably provided in the peripheral circuit region on the same side with respect to the pixel array unit.
- the control line and the scanning line preferably have a structure in which the wiring material, thickness, and width are the same.
- the write scan signal is subjected to the threshold correction processing and the signal voltage writing twice.
- the pulse widths of the two pulses when the write scanning signal is in the active state twice can be the same.
- the pixel circuit can be configured to perform mobility correction processing in the period of the second pulse of the two pulses.
- the mobility correction process is a process for correcting the mobility of the drive transistor by applying negative feedback to the potential difference between the gate and source of the drive transistor with a correction amount corresponding to the current flowing through the drive transistor.
- FIG. 1 is a system configuration diagram illustrating an outline of a basic configuration of an active matrix organic EL display device which is a premise of the present disclosure.
- An active matrix display device is a display device that drives a light emitting portion (light emitting element) by an active element provided in the same pixel as the light emitting portion, for example, an insulated gate field effect transistor.
- an insulated gate field effect transistor typically, a thin film transistor (TFT) can be used.
- the organic EL element is a current-driven electro-optical element whose emission luminance changes according to the value of current flowing through the device.
- unit pixel / pixel circuit may be simply referred to as “pixel”.
- the thin film transistor is used not only for pixel control but also for peripheral circuit control described later.
- an active matrix organic EL display device 10 which is a premise of the present disclosure includes a pixel array unit 30 in which a plurality of unit pixels 20 are two-dimensionally arranged in a matrix (matrix), and its periphery
- the driving unit (peripheral circuit) is arranged in the region and drives the pixel 20.
- the driving unit includes, for example, a writing scanning unit 40, a power supply scanning unit 50, a signal output unit 60, and the like, and drives each pixel 20 of the pixel array unit 30.
- the write scanning unit 40, the power supply scanning unit 50, and the signal output unit 60 are mounted on the same substrate as the pixel array unit 30, that is, on the display panel 70 as peripheral circuits of the pixel array unit 30. ing. However, it is also possible to adopt a configuration in which some or all of the write scanning unit 40, the power supply scanning unit 50, and the signal output unit 60 are provided outside the display panel 70. Further, although the writing scanning unit 40 and the power supply scanning unit 50 are each arranged on one side of the pixel array unit 30, it is also possible to adopt a configuration arranged on both sides of the pixel array unit 30.
- a transparent insulating substrate such as a glass substrate can be used, or a semiconductor substrate such as a silicon substrate can be used.
- one pixel (unit pixel / pixel) serving 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 subpixel that emits red (Red: R) light, a subpixel that emits green (Green: G) light, and a blue pixel. (Blue: B) It is composed of three sub-pixels of sub-pixels that emit light.
- 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 unit 30 supplies power to the scanning lines 31 (31 1 to 31 m ) 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.
- a line 32 (32 1 to 32 m ) is wired for each pixel row.
- signal lines 33 (33 1 to 33 n ) are wired for each pixel column along the column direction (the pixel array direction / vertical direction) with respect to the array of pixels 20 in m rows and n columns. Yes.
- the scanning lines 31 1 to 31 m are connected to the output ends of the corresponding rows of the writing scanning unit 40, respectively.
- the power supply lines 32 1 to 32 m are connected to the output ends of the corresponding rows of the power supply scanning unit 50, respectively.
- the signal lines 33 1 to 33 n are connected to the output ends of the corresponding columns of the signal output unit 60, respectively.
- 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 power supply scanning unit 50 is configured by a shift register circuit or the like, similar to the writing scanning unit 40.
- the power supply scanning unit 50 can switch between the first power supply voltage V ccp and the second power supply voltage V ini that is lower than the first power supply voltage V ccp in synchronization with the line sequential scanning performed by the writing scanning unit 40.
- the power supply voltage DS (DS 1 to DS m ) is supplied to the power supply line 32 (32 1 to 32 m ).
- light emission / non-light emission (quenching) of the pixel 20 is controlled by switching the power supply voltage DS to V ccp / V ini .
- the signal output unit 60 is supplied from a signal supply source (not shown), and a signal voltage V sig and a reference voltage V of a video signal corresponding to luminance information (hereinafter sometimes simply referred to as “signal voltage”). ofs is selectively output.
- the reference voltage V ofs is a voltage serving 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 in threshold correction processing described later.
- the signal voltage V sig / reference voltage V ofs output from the signal output unit 60 is scanned by the writing scanning unit 40 with respect to each pixel 20 of the pixel array unit 30 via the signal line 33 (33 1 to 33 n ).
- 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 showing an example of a specific circuit configuration of the unit pixel (pixel circuit) 20.
- the light-emitting portion of the pixel 20 includes an organic EL element 21 which is an example of a current-driven electro-optical element whose light emission luminance changes according to a current value flowing through the device.
- the pixel 20 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.
- a driving circuit for driving the organic EL element 21 includes a driving transistor 22, a writing transistor 23, a holding capacitor 24, and an auxiliary capacitor 25, that is, a 2Tr2C having two transistors (Tr) and two capacitors (C). It has a circuit configuration.
- N-channel thin film transistors (TFTs) are used as the drive transistor 22 and the write transistor 23.
- TFTs N-channel thin film transistors
- the combination of the conductivity types of the drive transistor 22 and the write transistor 23 shown here is merely an example, and is not limited to these combinations.
- the drive transistor 22 has one electrode (source / drain electrode) connected to the power supply line 32 (32 1 to 32 m ) and the other electrode (source / drain electrode) connected to the anode electrode of the organic EL element 21. ing.
- the write transistor 23 has one electrode (source / drain electrode) connected to the signal line 33 (33 1 to 33 n ) and the other electrode (source / drain electrode) connected to the gate electrode of the drive transistor 22. .
- the gate electrode of the writing transistor 23 is connected to the scanning line 31 (31 1 to 31 m ).
- one electrode refers to a metal wiring electrically connected to one source / drain region, and the other electrode is electrically connected to the other source / drain region.
- the metal wiring is electrically connected to the other source / drain region.
- the holding capacitor 24 has one electrode connected to the gate electrode of the drive transistor 22 and the other electrode connected to the other electrode of the drive transistor 22 and the anode electrode of the organic EL element 21.
- the auxiliary capacitor 25 has one electrode connected to the anode electrode of the organic EL element 21 and the other electrode connected to the cathode electrode of the organic EL element 21, that is, connected in parallel to the organic EL element 21. Yes.
- the write transistor 23 becomes conductive in response to the write scan signal WS that is applied to the gate electrode from the write scanning unit 40 through the scanning line 31 and in which the high voltage state becomes the active state.
- the write transistor 23 samples the signal voltage V sig or the reference voltage V ofs of the video signal corresponding to the luminance information supplied from the signal output unit 60 through the signal line 33 at different timings, and writes the sampled voltage in the pixel 20.
- the signal voltage V sig or the reference voltage V ofs written by the write transistor 23 is held in the holding capacitor 24.
- the drive transistor 22 When the power supply voltage DS of the power supply line 32 (32 1 to 32 m ) is at the first power supply voltage V ccp , the drive transistor 22 has one electrode as a drain electrode and the other electrode as a source electrode in a saturation region. Operate. As a result, the drive transistor 22 is supplied with current from the power supply line 32 and drives the organic EL element 21 to emit light by current drive. More specifically, the drive transistor 22 operates in the saturation region, thereby supplying the organic EL element 21 with a drive current having a current value corresponding to the voltage value of the signal voltage V sig held in the storage capacitor 24. The organic EL element 21 is caused to emit light by current driving.
- the drive transistor 22 when the power supply voltage DS is switched from the first power supply voltage V ccp to the second power supply voltage V ini , the drive transistor 22 operates as a switching transistor with one electrode serving as a source electrode and the other electrode serving as a drain electrode. As a result, the drive transistor 22 stops supplying the drive current to the organic EL element 21 and puts the organic EL element 21 into a non-light emitting state. That is, the drive transistor 22 also has a function as a transistor that controls light emission / non-light emission of the organic EL element 21.
- a period during which the organic EL element 21 is in a non-light emitting state (non-light emitting period) is provided, and the ratio (duty) of the light emitting period and the non-light emitting period of the organic EL element 21 can be controlled.
- This duty control can reduce the afterimage blur caused by the light emission of the pixels over one display frame period, so that the quality of moving images can be particularly improved.
- the first power supply voltage V ccp is a driving current for driving the organic EL element 21 to emit light.
- the power supply voltage is supplied to the driving transistor 22.
- the second power supply voltage V ini is a power supply voltage for applying a reverse bias to the organic EL element 21.
- the second power supply voltage V ini is a voltage lower than the reference voltage V ofs , for example, a voltage lower than V ofs ⁇ V th when the threshold voltage of the driving transistor 22 is V th , preferably V ofs ⁇ V th. Is set to a sufficiently lower voltage.
- Each pixel 20 of the pixel array unit 30 has a function of correcting a variation in driving current caused by a variation in characteristics of the driving transistor 22.
- the characteristics of the drive transistor 22 for example, the threshold voltage V th of the drive transistor 22 and the mobility u of the semiconductor thin film constituting the channel of the drive transistor 22 (hereinafter simply referred to as “mobility u of the drive transistor 22”) are described. ).
- correction of variation in drive current due to variation in threshold voltage V th is performed by initializing the gate voltage V g of the drive transistor 22 to the reference voltage V ofs .
- the drive transistor 22 is directed toward the potential obtained by subtracting the threshold voltage V th of the drive transistor 22 from the initialization voltage with reference to the initialization voltage (reference voltage V ofs ) of the gate voltage V g of the drive transistor 22.
- the operation of changing the source voltage V s of is performed. As this operation proceeds, the gate-source voltage V gs of the drive transistor 22 eventually converges to the threshold voltage V th of the drive transistor 22. A voltage corresponding to the threshold voltage V th is held in the holding capacitor 24.
- the drain-source current I flowing in the driving transistor 22 when the driving transistor 22 is driven by the signal voltage V sig of the video signal Since the voltage corresponding to the threshold voltage V th is held in the holding capacitor 24, the drain-source current I flowing in the driving transistor 22 when the driving transistor 22 is driven by the signal voltage V sig of the video signal. The dependence of ds on the threshold voltage V th can be suppressed.
- the write transistor 23 is in the conductive state and the signal voltage V sig of the video signal is written.
- the current flows through the storage capacitor 24 through the driving transistor 22.
- it is performed by applying negative feedback to the storage capacitor 24 with a feedback amount (correction amount) corresponding to the current I ds flowing through the drive transistor 22.
- the mobility of the drain-source current I ds flowing through the drive transistor 22 is increased.
- the dependence on u can be suppressed.
- FIG. 3 is a timing waveform diagram for explaining a basic circuit operation in an ideal state of the organic EL display device 10 having the above configuration.
- the voltage of the scanning line 31 (write scanning signal) WS the voltage of the power supply line 32 (power supply voltage) DS
- the voltage of the signal line 33 V sig / V ofs
- the drive transistor 22 It shows each change of the gate voltage V g and the source voltage V s.
- the write transistor 23 Since the write transistor 23 is an N-channel type, the high voltage state of the write scan signal WS becomes an active state, and the low voltage state becomes an inactive state. Then, the write transistor 23 becomes conductive when the write scan signal WS is active, and becomes nonconductive when it is inactive.
- the period from time t 11 to time t 19 is the voltage switching cycle of the signal line 33, that is, the switching cycle of the video signal signal voltage V sig and the reference voltage V ofs. Switching between V sig and the reference voltage V ofs is performed within one horizontal period (1H).
- the time before the time t 12 is the light emission period of the organic EL element 21 in the previous display frame.
- the non-light emission period of a new display frame (current display frame) of line sequential scanning is entered.
- a period from time t 13 to time t 15 when the write scan signal WS is in an active state is a write period during which the write transistor 23 writes the reference voltage V ofs into the pixel 20.
- the period from time t 14 when the voltage DS of the power supply line 32 is switched from the second power supply voltage V ini to the first power supply voltage V ccp to time t 15 when the write scanning signal WS transitions to the inactive state is driven. This is a threshold correction period for correcting variations in drive current caused by variations in the threshold voltage V th of the transistor 22.
- the voltage of the signal line 33 becomes the signal voltage V sig of the video signal.
- the write scanning signal WS is again activated, so that the write transistor 23 is turned on.
- the signal voltage V sig of the video signal is written into the pixel 20 by the writing transistor 23, and mobility correction processing for correcting the variation in the drive current due to the variation in the mobility u of the drive transistor 22 is performed. That is, the period from the time t 17 to the time t 18 becomes the writing & mobility correction period of the signal voltage V sig .
- the light emission period of the current display frame starts.
- V cath is the cathode voltage of the organic EL element 21.
- V thel is a threshold voltage of the organic EL element 21.
- the change in the source voltage of the drive transistor 22 during the mobility correction operation is caused by the current supply capability of the drive transistor 22 and the capacitance value of the pixel capacitor connected to the source electrode of the drive transistor 22. And determined by the relationship. Specifically, the source voltage V of the drive transistor 22 after the mobility correction operation is given by the following equation (1).
- V sig is the signal voltage of the video signal
- V th is the threshold voltage of the drive transistor 22
- V s is the source voltage of the drive transistor 22 before the mobility correction operation
- t is the mobility correction time
- ⁇ is the drive transistor 22.
- C is a capacitance value of the pixel capacitance.
- the capacitance value of the storage capacitor 24 is C s
- the capacitance value of the equivalent capacitance of the organic EL element 21 is C oled
- the capacitance value of the auxiliary capacitor 25 is C sub
- C C s + C oled + C sub
- u is the mobility of the semiconductor thin film constituting the channel of the driving transistor 22
- C ox is the gate capacitance per unit area of the driving transistor 22
- W is the channel width
- L is the channel length.
- the mobility correction time (signal writing & mobility correction period) is shortened, and before the current starts to flow through the organic EL element 21, that is, before the organic EL element 21 is turned on, the movement is performed.
- Driving to end the degree correction operation can be considered.
- the mobility correction time is determined by the pulse width of the mobility correction pulse, which is the second pulse of the write scanning signal WS in the timing waveform diagram of FIG. Therefore, the mobility correction time can be shortened by shortening the mobility correction pulse. And by this drive, the deterioration of uniformity by the organic EL element 21 turning on during a mobility correction period can be suppressed.
- a circuit for generating a mobility correction pulse having a narrow (short) pulse width is required. I need it.
- a pulse signal having a pulse width of about several hundreds of nsec is input to the display panel 70, and the writing scan signal WS including the mobility correction pulse is generated in the display panel 70 based on the pulse signal.
- a pulse width adjustment circuit is provided on the display panel 70. Need to form.
- FIG. 5 shows a configuration example of the pulse width adjustment circuit in the peripheral circuit of the pixel array unit 30.
- FIG. 5 also illustrates the pixel array unit 30 and the write scanning unit 40 that is one of its peripheral circuits.
- the write scanning unit 40 is composed of, for example, a shift register circuit, and shift signals WSSR 1 to WSSR 1 to WSSR 1 are output from each shift stage based on a clock pulse WSCK and a start pulse WSST that are input from outside the display panel 70 via input terminals 71 and 72. Output WSSR m .
- the shift signals WSSR 1 to WSSR m pass through the switch circuits 41 1 to 41 m provided for each pixel row, and are sent to the respective pixel rows of the pixel array unit 30 as write scanning signals WS 1 to WS m including mobility correction pulses. Supplied against.
- enable signals WSEN 1 and WSEN 2 are input to the peripheral circuits on the display panel 70 through the input terminals 73 and 74.
- the pulse width of the enable signals WSEN 1 and WSEN 2 is about several hundreds nsec.
- the enable signals WSEN 1 and WSEN 2 are supplied to the pulse width adjustment circuit 80 via level shift (L / S) circuits 75 and 76.
- the pulse width adjustment circuit 80 includes a delay circuit unit 81 and a gate circuit unit 82.
- the delay circuit unit 81 is a circuit part for determining the pulse width of the mobility correction pulse, and has a configuration in which a plurality of inverter circuits are connected in series.
- the gate circuit unit 82 includes a NAND circuit 821, an inverter circuit 822, a NOR circuit 823, and an inverter circuit 824.
- the NAND circuit 821 has two inputs for the input signal and the output signal of the delay circuit unit 81.
- the output signal of the NAND circuit 821 becomes one input signal A of the NOR circuit 823 via the inverter circuit 822.
- the pulse width of the input signal A is about several nsec, which is the pulse width of the mobility correction pulse.
- the NOR circuit 823 uses the enable signal WSEN 2 passed through the level shift circuit 76 as the other input signal.
- the output signal of the NOR circuit 823 is supplied to the buffer circuit 83 via the inverter circuit 824.
- the buffer circuit 83 has a configuration in which a plurality of inverter circuits are connected in series.
- the output signal B of the buffer circuit 83 is supplied to the switch circuits 41 1 to 41 m .
- FIG. 6 shows the waveform of the signal at each part in FIG. Specifically, FIG. 6 shows waveforms of a clock pulse WSCK, a start pulse WSST, enable signals WSEN 1 and WSEN 2 , one input signal A of the NOR circuit 823, and an output signal B of the buffer circuit 83. ing. 6 further shows shift signals WSSR 1 , WSSR 2 , WSSR 3 , WSSR 4 for the four pixel rows of the write scanning unit 40 and write scan signals WS 1 , WS 2 , WS 3 , WS 4 for the four pixel rows. Each waveform is shown.
- the pulse width adjustment circuit 80 As described above, in order to reduce the pulse width of the mobility correction pulse, it is necessary to form the pulse width adjustment circuit 80 having the above configuration on the display panel 70. Further, when outputting the write scanning signal WS to each pixel 20 of the pixel array section 30, it is necessary to increase the element size of the switch circuits 41 1 to 41 m in order to prevent a delay of the pulse. When the element size is increased, the parasitic capacitance attached to the wiring connected to the drains (sources) of the switch circuits 41 1 to 41 m increases, so that the element size of the buffer circuit 83 needs to be increased.
- the pulse width adjustment circuit 80 in order to reduce the pulse width of the mobility correction pulse, it is necessary to form the pulse width adjustment circuit 80 on the display panel 70 or increase the element size of the buffer circuit 83.
- the circuit scale of the peripheral circuit of the pixel array unit 30 increases.
- the area of the peripheral circuit region of the pixel array unit 30 where the peripheral circuits on the display panel 70 are arranged, that is, the area of the frame region is increased.
- the yield theoretical yield
- the active matrix organic EL display device eliminates the need for shortening the pulse width of the mobility correction pulse (drive pulse) and enables the circuit scale of the peripheral circuit of the pixel array unit to be reduced. Therefore, the operating point of the drive transistor 22 is set as a cutoff region after the threshold correction process. Specifically, the operating point of the driving transistor 22 is set as a cut-off region by applying a potential change to the source electrode of the driving transistor 22 by coupling through the auxiliary capacitor 25 (so-called capacitive coupling).
- the potential of the source electrode of the drive transistor 22 can be changed by applying a potential change to the other end of the auxiliary capacitor 25 whose one end is connected to the source electrode of the drive transistor 22. More specifically, the other end of the auxiliary capacitor 25 is connected to the control line, and the control signal OS applied to the other end of the auxiliary capacitor 25 through the control line is switched from the inactive state to the active state, thereby the source of the drive transistor 22 A potential change is applied to the electrode.
- the source voltage of the drive transistor 22 when a potential change is applied to the source electrode of the drive transistor 22 is set to be at least a voltage smaller than V cath + V thel .
- V cath is the cathode voltage of the organic EL element 21
- V thel is the threshold voltage of the organic EL element 21.
- the amplitude of the control signal OS is ⁇ V os
- the gate voltage V g ′ of the drive transistor 22 is It becomes.
- C p is a parasitic capacitance formed at the gate electrode of the write transistor 23.
- the voltage setting is specifically performed as follows so that the driving transistor 22 maintains the cut-off state even when the maximum voltage is written. I do.
- the following actions and effects can be obtained.
- the signal voltage V sig of the video signal is written by the writing transistor 23 after the threshold correction processing
- the current I ds does not flow through the driving transistor 22 as a matter of course.
- the fact that the pulse width of the mobility correction pulse does not have to be narrowed means that the pulse width adjustment circuit 80 (see FIG. 5) for shortening the mobility correction pulse is not formed on the display panel 70. That's it. Thereby, the circuit scale of the peripheral circuit of the pixel array unit 30 can be reduced. Since the circuit scale of the peripheral circuit of the pixel array unit 30 can be reduced, the display panel 70 can be narrowed as compared with the case where the mobility correction pulse has a shorter pulse width. 70 can be reduced in size. Further, when a structure using a semiconductor substrate such as a silicon substrate is adopted as the substrate of the display panel 70, an improvement in profitability can be expected, which can contribute to a reduction in cost of the display device.
- the technique of the present disclosure described above can be applied to the case where the transistor constituting the pixel (pixel circuit) 20 is formed of an N-channel type transistor or a P-channel type transistor.
- a pixel circuit including an N-channel transistor will be described as a pixel circuit according to the first embodiment
- a pixel circuit including a P-channel transistor will be described as a pixel circuit according to the second embodiment.
- the pixel circuit according to the first embodiment has an advantage that the number of constituent elements of the pixel circuit is smaller than that of the pixel circuit according to the second embodiment.
- FIG. 7 is a system configuration diagram illustrating an outline of a configuration of an organic EL display device including the pixel circuit according to the first embodiment.
- the pixel circuit 20A basically includes the same components as the pixel circuit 20 shown in FIG. Specifically, the pixel circuit 20 ⁇ / b> A includes an organic EL element 21, a drive transistor 22, a write transistor 23, a storage capacitor 24, and an auxiliary capacitor 25.
- the drive transistor 22 and the write transistor 23 are N-channel MOS transistors.
- the pixel circuit 20 ⁇ / b> A is different from the pixel circuit 20 in that the other end of the auxiliary capacitor 25 having one end connected to the source electrode of the driving transistor 22 is connected to the control line 35.
- the pixel circuit 20A having the above configuration is two-dimensionally arranged in a matrix to form a pixel array unit 30.
- a control line 35 is wired for each pixel row along the pixel row for the matrix arrangement of the pixel circuit 20A.
- the organic EL display device 10 including the pixel circuit 20A according to the first embodiment includes a control scanning unit 90 as a control unit in addition to the writing scanning unit 40 and the signal output unit 60 as a peripheral circuit of the pixel array unit 30.
- the control scanning unit 90 is, for example, a peripheral circuit region (frame region) on the same side as the writing scanning unit 40 with respect to the pixel array unit 30, more specifically, one of the horizontal direction (row direction) of the pixel array unit 30 in the figure. In the peripheral circuit area on the side.
- the other end of the auxiliary capacitor 25 is connected to the control line 35 for each pixel circuit 20A.
- One end of the control line 35 is connected to the output end of the corresponding row of the control scanning unit 90.
- the control scanning unit 90 is configured by a shift register circuit or the like, similar to the writing scanning unit 40.
- the control scanning unit 90 synchronizes with the line-sequential scanning by the writing scanning unit 40 in an active state (in this example, a high voltage in the period from the threshold correction processing to before the writing processing of the signal voltage V sig ends.
- the control signal OS in the state (2) is output.
- the scanning line 31 that transmits the write scanning signal WS to the pixel circuit 20A and the control line 35 that transmits the control signal OS to the pixel circuit 20A are preferably made of the same wiring material. Further, it is preferable that the scanning line 31 and the control line 35 are formed so as to have the same thickness and width.
- “same” means not only exactly the same but also substantially the same, and the presence of various variations in design or manufacturing is allowed.
- FIG. 8 is a timing waveform chart for explaining the circuit operation of the organic EL display device 10 including 20A according to the first embodiment.
- the timing waveform diagram of FIG. 8 shows changes in the waveforms of the power supply voltage (V ccp / V ini ) DS, the write scanning signal WS, the control signal OS, the gate voltage V g of the driving transistor 22 and the source voltage V s. ing.
- the control scanning unit 90 switches the control signal OS applied to the other end of the auxiliary capacitor 25 through the control line 35 from the inactive state to the active state, that is, transitions from the low voltage state to the high voltage state.
- a potential change is applied to the other end of the auxiliary capacitor 25.
- the potential of the source electrode of the drive transistor 22 is changed by coupling through the auxiliary capacitor 25, and the operating point of the drive transistor 22 is set as a cutoff region. it can.
- the pulse width of the mobility correction pulse can be set wide.
- the pulse width of the mobility correction pulse which is the second pulse of the writing scanning signal WS, is set to the first width of the writing scanning signal WS. It is set to be the same as the pulse width of the pulse.
- “same” means not only exactly the same but also substantially the same, and the presence of various variations in design or manufacturing is allowed.
- the circuit configuration of the write scanning unit 40 that generates the write scanning signal WS is changed to two This can be simplified compared to the case where the pulse width is different. That is, when two pulses having different pulse widths are generated, two systems of logic circuits or the like for generating the respective pulses are required. However, by making the two pulse widths the same, one system of logic circuits or the like is generated. Therefore, the circuit configuration of the write scanning unit 40 can be simplified.
- circuit operation a circuit operation (display device driving method) of the organic EL display device 10 including the pixel circuit 20A according to the first embodiment will be described with reference to a timing waveform diagram of FIG.
- the write transistor 23 Since the write transistor 23 is an N-channel transistor, the high voltage state of the write scan signal WS becomes active and the low voltage state becomes inactive. Then, the write transistor 23 becomes conductive when the write scan signal WS is active, and becomes nonconductive when it is inactive. As for the control signal OS, the high voltage state becomes the active state, and the low voltage state becomes the inactive state.
- the power supply voltage DS is switched from the first power supply voltage V ccp to the second power supply voltage V ini.
- the second power supply voltage V ini is V ini ⁇ V thel + V cath
- the source voltage V s of the drive transistor 22 is substantially equal to the second power supply voltage V ini , so that the organic EL element 21 is in a reverse bias state. Becomes extinct.
- the writing scanning signal WS by the active state at time t 22 (1 nd pulse) becomes a writing transistor 23 is conductive, writes the reference voltage V ofs in the pixel 20A.
- the gate voltage V g of the driving transistor 22 is initialized to the reference voltage V ofs.
- a period from time t 23 when the power supply voltage DS switches from the second power supply voltage V ini to the first power supply voltage V ccp to time t 24 when the write scanning signal WS transitions from the active state to the inactive state is a threshold correction period. It becomes.
- the control signal OS switches from the inactive state to the active state, that is, transitions from the low voltage state to the high voltage state, whereby the potential is applied to the other end of the auxiliary capacitor 25.
- the source voltage V s of the drive transistor 22 changes due to coupling through the auxiliary capacitor 25 (capacitive coupling), so that the operating point of the drive transistor 22 becomes a cutoff region. Therefore, the current I ds does not flow through the drive transistor 22.
- the writing scanning signal WS by becoming active again (second pulse) at time t 26, becomes the writing transistor 23 is conductive, the pixel signal voltage V sig of the video signal Write in 20A. Then, at time t 27 , the control signal OS is switched from the active state to the inactive state, so that the driving transistor 22 becomes conductive, the current I ds flows through the driving transistor 22, and mobility correction processing is performed.
- the writing scanning signal WS transitions from the active state to the inactive state, whereby the signal writing & mobility correction period ends and a new display frame emission period starts.
- a potential change is applied to the other end of the auxiliary capacitor 25 after the threshold correction process, and a potential change is applied to the source electrode of the drive transistor 22 by coupling through the auxiliary capacitor 25.
- the operating point is a cut-off region. According to this circuit operation, when the signal voltage V sig is written, since the current I ds does not flow through the drive transistor 22, the source voltage V s of the drive transistor 22 other than the coupling accompanying the writing of the signal voltage V sig. It is possible to eliminate the factor that fluctuates.
- the pulse width adjusting circuit 80 (see FIG. 5) for generating the mobility correction pulse having a narrow pulse width on the display panel 70, and thus the circuit scale of the peripheral circuit of the pixel array unit 30 is reduced. Can be achieved. And since the circuit scale of a peripheral circuit can be reduced, a frame can be narrowed and the display panel 70 can be reduced in size accordingly.
- the control scanning unit 90 is provided in the peripheral circuit region on the same side as the writing scanning unit 40 with respect to the pixel array unit 30.
- the distance from the write scanning unit 40 and the control scanning unit 90 to the pixel circuit 20A to be driven can be made substantially equal, so that the timing shift due to the difference in the distance between the write scanning signal WS and the control signal OD is minimized. To the limit.
- the scanning line 31 that transmits the write scanning signal WS to the pixel circuit 20A and the control line 35 that transmits the control signal OS to the pixel circuit 20A have the same wiring material, wiring thickness, and wiring width. It is formed as follows. Thereby, since the delay amount of the write scanning signal WS and the control signal OD when transmitted to the same pixel circuit 20A can be made substantially the same, the timing shift between them can be eliminated. As a result, it is possible to more reliably drive the pixel circuit 20A to be driven.
- all of the wiring material, the thickness of the wiring, and the width of the wiring are assumed to be the same, it is not limited to all.
- FIG. 9 is a system configuration diagram illustrating an outline of a configuration of an organic EL display device including the pixel circuit according to the second embodiment.
- the pixel circuit 20 ⁇ / b> B includes a switching transistor 26 and a current control transistor in addition to the organic EL element 21, the drive transistor 22, the write transistor 23, the storage capacitor 24, and the auxiliary capacitor 25. 27.
- the drive transistor 22, the write transistor 23, the switching transistor 26, and the current control transistor 27 are P-channel MOS transistors.
- the pixel circuit 20B having the above configuration is two-dimensionally arranged in a matrix to constitute the pixel array unit 30.
- a control line 35 is wired along the pixel row for each pixel row with respect to the matrix arrangement of the pixel circuit 20B.
- the first drive line 36 and the second drive line 37 are wired along the pixel row for each pixel row.
- the organic EL display device 10 including the pixel circuit 20B according to the second embodiment includes a control scanning unit 90 as a control unit in addition to the writing scanning unit 40 and the signal output unit 60 as a peripheral circuit of the pixel array unit 30.
- the control scanning unit 90 is, for example, a peripheral circuit region (frame region) on the same side as the writing scanning unit 40 with respect to the pixel array unit 30, more specifically, one of the horizontal direction (row direction) of the pixel array unit 30 in the figure. In the peripheral circuit area on the side.
- the other end of the auxiliary capacitor 25 is connected to the control line 35 for each pixel circuit 20B.
- One end of the control line 35 is connected to the output end of the corresponding row of the control scanning unit 90.
- the control scanning unit 90 is configured by a shift register circuit or the like, similar to the writing scanning unit 40.
- the control scanning unit 90 synchronizes with the line-sequential scanning by the writing scanning unit 40 in an active state (low voltage in this example) from the threshold correction processing to before the signal voltage V sig writing processing ends.
- the control signal OS in the state (2) is output.
- the scanning line 31 for transmitting the write scanning signal WS to the pixel circuit 20B and the control line 35 for transmitting the control signal OS to the pixel circuit 20B are preferably made of the same wiring material. Further, it is preferable that the scanning line 31 and the control line 35 are formed so as to have the same thickness and width.
- “same” means not only exactly the same but also substantially the same, and the presence of various variations in design or manufacturing is allowed.
- the organic EL display device 10 including the pixel circuit 20B according to the second embodiment further includes a drive scanning unit 91 and a current control scanning unit 92 as peripheral circuits of the pixel array unit 30.
- the drive scanning unit 91 and the current control scanning unit 92 are provided, for example, in a peripheral circuit region opposite to the writing scanning unit 40 and the control scanning unit 90 with the pixel array unit 30 interposed therebetween.
- the above arrangement of the writing scanning unit 40, the control scanning unit 90, the drive scanning unit 91, and the current control scanning unit 92 is an example and is not limited thereto.
- the gate electrode of the switching transistor 26 is connected to the first drive line 36 for each pixel circuit 20B.
- One end of the first drive line 36 is connected to the output end of the corresponding row of the drive scanning unit 91.
- the drive scanning unit 91 is configured by a shift register circuit or the like, similarly to the writing scanning unit 40.
- the drive scanning unit 91 outputs a drive signal AZ that is in an active state over a period from the start of the threshold correction processing to the start of light emission in synchronization with the line sequential scanning by the writing scanning unit 40.
- the gate electrode of the current control transistor 27 is connected to the second drive line 37 for each pixel circuit 20B.
- One end of the second drive line 37 is connected to the output end of the corresponding row of the current control scanning unit 92.
- the current control scanning unit 92 is in an inactive state (in this example, a high voltage state) over a period from the start of the threshold correction processing to before the start of light emission in synchronization with the line sequential scanning by the writing scanning unit 40. In other periods, the current control signal DS that is in the active state is output.
- each transistor of the pixel circuit 20B is formed of a P-channel transistor, the low voltage state of the current control signal DS, the drive signal AZ, the write scan signal WS, and the control signal OS becomes an active state, and the high voltage The state becomes inactive. Then, the write transistor 23 becomes conductive when the write scan signal WS is active, and becomes nonconductive when it is inactive. The switching transistor 26 becomes conductive when the drive signal AZ is active, and becomes nonconductive when the drive signal AZ is inactive. The current control transistor 27 becomes conductive when the current control signal DS is active, and becomes non-conductive when inactive.
- the period from time t 31 to time t 42 is one horizontal period (1H).
- the writing scanning signal WS and drive signal AZ at time t 32 is that the active state, the write transistor 23 and The switching transistor 26 becomes conductive.
- the period from time t 32 to time t 33 when the current control signal DS transitions from the active state to the inactive state is the extinction of the organic EL element 21, the source voltage V s of the driving transistor 22, and the drain voltage V d .
- This is a period for resetting and preparation for threshold correction processing.
- Threshold value correction period is a period from the time t 33 to time t 34 to the writing scanning signal WS is changed to the inactive state.
- the control signal OS at time t 35 after the threshold value correction process is switched from the inactive state to the active state, i.e., transitions from a high voltage state to a state of low voltage, a potential change to the other end of the auxiliary capacitor 25 give.
- the source voltage V s of the drive transistor 22 changes due to the coupling through the auxiliary capacitor 25, so that the operating point of the drive transistor 22 becomes a cutoff region. Therefore, the current I ds does not flow through the drive transistor 22.
- the voltage of the signal line 33 is switched from the reference voltage V ofs to the signal voltage V sig of the video signal.
- the write scan signal WS is again activated and the write transistor 23 is turned on, so that the signal voltage V sig is captured (written) into the pixel circuit 20B.
- the period from time t 37 to time t 38 to the writing scanning signal WS is changed to the inactive state is a signal writing and mobility correction period.
- control signal OS transitions to the inactive state at time t 39, followed, by a current control signal DS is changed to an active state at time t 40, the source electrode to the supply voltage V ccp of the driving transistor 22 is applied Thus, current supply to the drive transistor 22 becomes possible.
- the drive signal AZ makes a transition to the inactive state, entering the light-emitting period of the organic EL element 21.
- the voltage of the signal line 33 is switched from the signal voltage V sig of the video signal to the reference voltage V ofs at time t 42 , thereby completing the 1H period.
- the organic EL display device 10 including the pixel circuit 20B also has the first embodiment.
- the same operations and effects as those of the organic EL display device 10 including the pixel circuit 20A according to the above can be obtained.
- a mobility correction pulse with a narrow pulse width for mobility correction it is not necessary to prepare a mobility correction pulse with a narrow pulse width for mobility correction, and it is not necessary to form a pulse width adjustment circuit 80 (see FIG. 5) for generating it on the display panel 70.
- the circuit scale of the peripheral circuit of the array unit 30 can be reduced. And since the circuit scale of a peripheral circuit can be reduced, a frame can be narrowed and the display panel 70 can be reduced in size accordingly.
- the control scanning unit 90 is provided in the peripheral circuit region on the same side as the writing scanning unit 40 with respect to the pixel array unit 30.
- the distance from the writing scanning unit 40 and the control scanning unit 90 to the pixel circuit 20B to be driven can be made substantially equal, and therefore the timing shift due to the difference in distance between the writing scanning signal WS and the control signal OD is minimized. To the limit.
- the scanning line 31 that transmits the write scanning signal WS to the pixel circuit 20A and the control line 35 that transmits the control signal OS to the pixel circuit 20B have the same wiring material, wiring thickness, and wiring width. It is formed as follows. Thereby, since the delay amount of the write scanning signal WS and the control signal OD when transmitted to the same pixel circuit 20B can be made substantially the same, the timing shift between them can be eliminated. As a result, it is possible to more reliably drive the pixel circuit 20B to be driven.
- all of the wiring material, the thickness of the wiring, and the width of the wiring are assumed to be the same, it is not limited to all.
- the display device of the present disclosure described above is a display unit (display device) of an electronic device in any field that displays a video signal input to the electronic device or a video signal generated in the electronic device as an image or video.
- a display unit for example, it can be used as a display unit for a television set, a digital camera, a notebook personal computer, a mobile terminal device such as a mobile phone, a video camera, a head mounted display, or the like.
- the following effects can be obtained by using the display device of the present disclosure as the display unit in electronic devices of various fields. That is, according to the technique of the present disclosure, it is possible to suppress deterioration in uniformity due to the organic EL element turning on during the mobility correction period, and thus it is possible to improve image quality. In addition, since a small display panel can be manufactured, the profit can be increased, so that the cost of an electronic device including a display portion can be reduced. In addition, since the display panel can be downsized, the set can be downsized, and thus the degree of freedom in designing the product (electronic device) can be increased.
- the display device of the present disclosure also includes a module-shaped one with a sealed configuration.
- a display module formed by attaching a facing portion such as transparent glass to the pixel array portion is applicable.
- the display module may be provided with a circuit unit for inputting / outputting signals from the outside to the pixel array unit, a flexible printed circuit (FPC), and the like.
- FPC flexible printed circuit
- a digital camera and a head mounted display will be exemplified as specific examples of the electronic apparatus using the display device of the present disclosure.
- the specific example illustrated here is only an example, and is not limited thereto.
- FIG. 11 is an external view of a lens interchangeable single-lens reflex digital camera.
- FIG. 11A shows a front view thereof
- FIG. 11B shows a rear view thereof.
- the interchangeable-lens single-lens reflex digital camera has, for example, an interchangeable photographing lens unit (interchangeable lens) 112 on the front right side of the camera body (camera body) 111, and a photographer holds it on the front left side.
- the grip part 113 is provided.
- a monitor 114 is provided at the approximate center of the back of the camera body 111.
- a viewfinder (eyepiece window) 115 is provided above the monitor 114. The photographer can determine the composition by viewing the viewfinder 115 and visually recognizing the light image of the subject guided from the photographing lens unit 112.
- the display device of the present disclosure can be used as the viewfinder 115. That is, the lens interchangeable single-lens reflex digital camera according to this example is manufactured by using the display device of the present disclosure as the viewfinder 115.
- FIG. 12 is an external view of a head mounted display.
- the head-mounted display has, for example, ear hooks 212 for wearing on the user's head on both sides of the glasses-shaped display unit 211.
- the display device of the present disclosure can be used as the display unit 211. That is, the head mounted display according to the present example is manufactured by using the display device of the present disclosure as the display unit 211.
- a light emitting unit a writing transistor that writes a signal voltage of a video signal, a holding capacitor that holds the signal voltage written by the writing transistor, a driving transistor that drives the light emitting unit based on the signal voltage held by the holding capacitor, and A pixel circuit including an auxiliary capacitor having one end connected to the source node of the driving transistor is arranged in a matrix, The pixel circuit has a function of threshold correction processing for changing the source voltage of the drive transistor toward a voltage obtained by subtracting the threshold voltage of the drive transistor from the initialization voltage with reference to the initialization voltage of the gate voltage of the drive transistor.
- a display device comprising: [2] The control unit changes the potential of the source electrode of the driving transistor by applying a potential change to the other end of the auxiliary capacitor.
- [3] The other end of the auxiliary capacitor is connected to the control line, The control unit applies a potential change to the source electrode of the driving transistor by switching the control signal to be applied to the other end of the auxiliary capacitor through the control line from the inactive state to the active state.
- the display device according to [2] above.
- the source voltage of the driving transistor when a potential change is applied to the source electrode of the driving transistor is at least a voltage smaller than the cathode voltage of the light emitting unit + the threshold voltage of the light emitting unit.
- the display device according to any one of [1] to [3].
- the write transistor writes a signal voltage to the gate electrode of the drive transistor after a potential change is given to the source electrode of the drive transistor.
- the display device according to any one of [1] to [4].
- a writing scanning unit that drives the writing transistor in units of rows through the scanning line, The control unit and the writing scanning unit are provided in the peripheral circuit region on the same side with respect to the pixel array unit.
- the display device according to any one of [3] to [5].
- the control line and the scanning line have the same wiring material, thickness, and width.
- the write scanning signal becomes active twice during threshold correction processing and signal voltage writing,
- the pulse widths of the two pulses when the write scanning signal becomes active twice are the same.
- the pixel circuit performs negative feedback on the potential difference between the gate and the source of the driving transistor with a correction amount corresponding to the current flowing through the driving transistor in the period of the second pulse of the two pulses. Do mobility correction processing to correct the mobility of The display device according to [8] above.
- a light emitting unit a writing transistor that writes a signal voltage of a video signal, a holding capacitor that holds the signal voltage written by the writing transistor, a driving transistor that drives the light emitting unit based on the signal voltage held by the holding capacitor, and
- a pixel circuit including an auxiliary capacitor having one end connected to the source node of the driving transistor is arranged in a matrix, The pixel circuit has a function of threshold correction processing for changing the source voltage of the drive transistor toward a voltage obtained by subtracting the threshold voltage of the drive transistor from the initialization voltage with reference to the initialization voltage of the gate voltage of the drive transistor.
- a potential change is applied to the source electrode of the driving transistor by coupling through the auxiliary capacitor, and the operating point of the driving transistor is set as a cutoff region.
- a driving method of a display device After threshold correction processing, a potential change is applied to the source electrode of the driving transistor by coupling through the auxiliary capacitor, and the operating point of the driving transistor is set as a cutoff region.
- a light emitting unit a writing transistor that writes a signal voltage of a video signal, a holding capacitor that holds the signal voltage written by the writing transistor, a driving transistor that drives the light emitting unit based on the signal voltage held by the holding capacitor, and
- a pixel circuit including an auxiliary capacitor having one end connected to the source node of the driving transistor is arranged in a matrix, The pixel circuit has a function of threshold correction processing for changing the source voltage of the drive transistor toward a voltage obtained by subtracting the threshold voltage of the drive transistor from the initialization voltage with reference to the initialization voltage of the gate voltage of the drive transistor.
- An array section After the threshold correction processing, a control unit that applies a potential change to the source electrode of the driving transistor by coupling through the auxiliary capacitor and sets the operating point of the driving transistor as a cutoff region;
- An electronic apparatus having a display device.
Abstract
Description
発光部、映像信号の信号電圧を書き込む書込みトランジスタ、書込みトランジスタによって書き込まれた信号電圧を保持する保持容量、保持容量が保持する信号電圧に基づいて発光部を駆動する駆動トランジスタ、及び、駆動トランジスタのソースノードに一端が接続された補助容量を含む画素回路が行列状に配置されて成り、
画素回路は、駆動トランジスタのゲート電圧の初期化電圧を基準として当該初期化電圧から駆動トランジスタの閾値電圧を減じた電圧に向けて、駆動トランジスタのソース電圧を変化させる閾値補正処理の機能を有する画素アレイ部と、
閾値補正処理後に、補助容量を通してのカップリングにより駆動トランジスタのソース電極に対して電位変化を与えて駆動トランジスタの動作点をカットオフ領域とする制御部と、
を備える。
また、上記の目的を達成するための本開示の電子機器は、上記の構成の表示装置を有する。
発光部、映像信号の信号電圧を書き込む書込みトランジスタ、書込みトランジスタによって書き込まれた信号電圧を保持する保持容量、保持容量が保持する信号電圧に基づいて発光部を駆動する駆動トランジスタ、及び、駆動トランジスタのソースノードに一端が接続された補助容量を含む画素回路が行列状に配置されて成り、
画素回路は、駆動トランジスタのゲート電圧の初期化電圧を基準として当該初期化電圧から駆動トランジスタの閾値電圧を減じた電圧に向けて、駆動トランジスタのソース電圧を変化させる閾値補正処理の機能を有する画素アレイ部を備える表示装置の駆動に当たって、
閾値補正処理後に、補助容量を通してのカップリングにより駆動トランジスタのソース電極に対して電位変化を与えて駆動トランジスタの動作点をカットオフ領域とする。
尚、ここに記載された効果に必ずしも限定されるものではなく、本明細書中に記載されたいずれかの効果であってもよい。また、本明細書に記載された効果はあくまで例示であって、これに限定されるものではなく、また付加的な効果があってもよい。
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表示装置
2-1.システム構成
2-2.画素回路
2-3.理想状態での基本的な回路動作
2-4.移動度補正時間の短縮化について
2-5.パルス幅調整回路
3.本開示の実施形態に係る表示装置
3-1.実施例1(画素回路がNチャネル型のトランジスタから成る例)
3-2.実施例2(画素回路がPチャネル型のトランジスタから成る例)
4.電子機器
4-1.具体例1(デジタルカメラの例)
4-2.具体例2(ヘッドマウントディスプレイの例)
本開示の表示装置、表示装置の駆動方法、及び、電子機器にあっては、制御部について、補助容量の他端に電位変化を与えることによって駆動トランジスタのソース電極の電位を変化させる構成とすることができる。また、補助容量の他端が制御線に接続されているとき、制御部について、制御線を通して補助容量の他端に与える制御信号を非アクティブ状態からアクティブ状態に切り替えることによって駆動トランジスタのソース電極に対して電位変化を与える構成とすることができる。
[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有機EL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。
図2は、単位画素(画素回路)20の具体的な回路構成の一例を示す回路図である。画素20の発光部は、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有機EL素子21から成る。
図3は、上記の構成の有機EL表示装置10の理想状態での基本的な回路動作を説明するためのタイミング波形図である。図3のタイミング波形図には、走査線31の電圧(書込み走査信号)WS、電源供給線32の電圧(電源電圧)DS、信号線33の電圧(Vsig/Vofs)、駆動トランジスタ22のゲート電圧Vg及びソース電圧Vsのそれぞれの変化を示している。
以上説明した有機EL表示装置10において、移動度補正動作中の駆動トランジスタ22のソース電圧の変化は、駆動トランジスタ22の電流供給能力と駆動トランジスタ22のソース電極に接続されている画素容量の容量値との関係によって決定される。具体的には、移動度補正動作後の駆動トランジスタ22のソース電圧Vは、次式(1)で与えられる。
図5に、画素アレイ部30の周辺回路におけるパルス幅調整回路の構成例を示す。図5には、画素アレイ部30及びその周辺回路の一つである書込み走査部40についても図示している。
そこで、本開示の実施形態に係るアクティブマトリクス型有機EL表示装置は、移動度補正パルス(駆動パルス)の短パルス幅化を不要とし、画素アレイ部の周辺回路の回路規模の縮小化を可能にするために、閾値補正処理後に駆動トランジスタ22の動作点をカットオフ領域とする。具体的には、補助容量25を通してのカップリング(所謂、容量カップリング)により駆動トランジスタ22のソース電極に対して電位変化を与えることによって駆動トランジスタ22の動作点をカットオフ領域とする。
図7は、実施例1に係る画素回路を備える有機EL表示装置の構成の概略を示すシステム構成図である。
次に、実施例1に係る画素回路20Aを備える有機EL表示装置10の回路動作(表示装置の駆動方法)について、図8のタイミング波形図を用いて説明する。
図9は、実施例2に係る画素回路を備える有機EL表示装置の構成の概略を示すシステム構成図である。
次に、実施例2に係る画素回路20Bを備える有機EL表示装置10の回路動作について、図10のタイミング波形図を用いて説明する。図10のタイミング波形図には、信号線33の電圧(Vsig/Vofs)、電流制御信号DS、駆動信号AZ、書込み走査信号WS、制御信号OS、並びに、駆動トランジスタ22のソース電圧Vs、ゲート電圧Vg、及び、ドレイン電圧Vdのそれぞれの変化を示している。
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の表示部(表示装置)として用いることができる。一例として、例えば、テレビジョンセット、デジタルカメラ、ノート型パーソナルコンピュータ、携帯電話機等の携帯端末装置、ビデオカメラ、ヘッドマウントディスプレイ等の表示部として用いることができる。
図11は、レンズ交換式一眼レフレックスタイプのデジタルカメラの外観図であり、図11Aにその正面図を示し、図11Bにその背面図を示す。レンズ交換式一眼レフレックスタイプのデジタルカメラは、例えば、カメラ本体部(カメラボディ)111の正面右側に交換式の撮影レンズユニット(交換レンズ)112を有し、正面左側に撮影者が把持するためのグリップ部113を有している。
図12は、ヘッドマウントディスプレイの外観図である。ヘッドマウントディスプレイは、例えば、眼鏡形の表示部211の両側に、使用者の頭部に装着するための耳掛け部212を有している。このヘッドマウントディスプレイにおいて、その表示部211として本開示の表示装置を用いることができる。すなわち、本例に係るヘッドマウントディスプレイは、その表示部211として本開示の表示装置を用いることによって作製される。
[1]発光部、映像信号の信号電圧を書き込む書込みトランジスタ、書込みトランジスタによって書き込まれた信号電圧を保持する保持容量、保持容量が保持する信号電圧に基づいて発光部を駆動する駆動トランジスタ、及び、駆動トランジスタのソースノードに一端が接続された補助容量を含む画素回路が行列状に配置されて成り、
画素回路は、駆動トランジスタのゲート電圧の初期化電圧を基準として当該初期化電圧から駆動トランジスタの閾値電圧を減じた電圧に向けて、駆動トランジスタのソース電圧を変化させる閾値補正処理の機能を有する画素アレイ部と、
閾値補正処理後に、補助容量を通してのカップリングにより駆動トランジスタのソース電極に対して電位変化を与えて駆動トランジスタの動作点をカットオフ領域とする制御部と、
を備える表示装置。
[2]制御部は、補助容量の他端に電位変化を与えることによって駆動トランジスタのソース電極の電位を変化させる、
上記[1]に記載の表示装置。
[3]補助容量の他端は、制御線に接続されており、
制御部は、制御線を通して補助容量の他端に与える制御信号を非アクティブ状態からアクティブ状態に切り替えることによって駆動トランジスタのソース電極に対して電位変化を与える、
上記[2]に記載の表示装置。
[4]駆動トランジスタのソース電極に対して電位変化を与えたときの駆動トランジスタのソース電圧は、少なくとも、発光部のカソード電圧+発光部の閾値電圧よりも小さい電圧である、
上記[1]乃至上記[3]のいずれかに記載の表示装置。
[5]書込みトランジスタは、駆動トランジスタのソース電極に対して電位変化が与えられた後に、駆動トランジスタのゲート電極に信号電圧を書き込む、
上記[1]乃至上記[4]のいずれかに記載の表示装置。
[6]書込みトランジスタを走査線を通して行単位で駆動する書込み走査部を備え、
制御部と書込み走査部とは、画素アレイ部に関して同じ側の周辺回路領域に設けられている、
上記[3]乃至上記[5]のいずれかに記載の表示装置。
[7]制御線及び走査線は、配線の材料、厚み、及び、幅が同じである、
上記[6]に記載の表示装置。
[8]書込み走査信号は、閾値補正処理の際及び信号電圧の書込みの際の2回アクティブ状態となり、
書込み走査信号が2回アクティブ状態となるときの2つのパルスのパルス幅は同じである、
上記[1]乃至上記[7]のいずれかに記載の表示装置。
[9]画素回路は、2つのパルスのうち2つ目のパルスの期間において、駆動トランジスタに流れる電流に応じた補正量で駆動トランジスタのゲート-ソース間の電位差に負帰還をかけることによって駆動トランジスタの移動度を補正する移動度補正処理を行う、
上記[8]に記載の表示装置。
[10]発光部、映像信号の信号電圧を書き込む書込みトランジスタ、書込みトランジスタによって書き込まれた信号電圧を保持する保持容量、保持容量が保持する信号電圧に基づいて発光部を駆動する駆動トランジスタ、及び、駆動トランジスタのソースノードに一端が接続された補助容量を含む画素回路が行列状に配置されて成り、
画素回路は、駆動トランジスタのゲート電圧の初期化電圧を基準として当該初期化電圧から駆動トランジスタの閾値電圧を減じた電圧に向けて、駆動トランジスタのソース電圧を変化させる閾値補正処理の機能を有する画素アレイ部を備える表示装置の駆動に当たって、
閾値補正処理後に、補助容量を通してのカップリングにより駆動トランジスタのソース電極に対して電位変化を与えて駆動トランジスタの動作点をカットオフ領域とする、
表示装置の駆動方法。
[11]発光部、映像信号の信号電圧を書き込む書込みトランジスタ、書込みトランジスタによって書き込まれた信号電圧を保持する保持容量、保持容量が保持する信号電圧に基づいて発光部を駆動する駆動トランジスタ、及び、駆動トランジスタのソースノードに一端が接続された補助容量を含む画素回路が行列状に配置されて成り、
画素回路は、駆動トランジスタのゲート電圧の初期化電圧を基準として当該初期化電圧から駆動トランジスタの閾値電圧を減じた電圧に向けて、駆動トランジスタのソース電圧を変化させる閾値補正処理の機能を有する画素アレイ部と、
閾値補正処理後に、補助容量を通してのカップリングにより駆動トランジスタのソース電極に対して電位変化を与えて駆動トランジスタの動作点をカットオフ領域とする制御部と、
を備える表示装置を有する電子機器。
Claims (11)
- 発光部、映像信号の信号電圧を書き込む書込みトランジスタ、書込みトランジスタによって書き込まれた信号電圧を保持する保持容量、保持容量が保持する信号電圧に基づいて発光部を駆動する駆動トランジスタ、及び、駆動トランジスタのソースノードに一端が接続された補助容量を含む画素回路が行列状に配置されて成り、
画素回路は、駆動トランジスタのゲート電圧の初期化電圧を基準として当該初期化電圧から駆動トランジスタの閾値電圧を減じた電圧に向けて、駆動トランジスタのソース電圧を変化させる閾値補正処理の機能を有する画素アレイ部と、
閾値補正処理後に、補助容量を通してのカップリングにより駆動トランジスタのソース電極に対して電位変化を与えて駆動トランジスタの動作点をカットオフ領域とする制御部と、
を備える表示装置。 - 制御部は、補助容量の他端に電位変化を与えることによって駆動トランジスタのソース電極の電位を変化させる、
請求項1に記載の表示装置。 - 補助容量の他端は、制御線に接続されており、
制御部は、制御線を通して補助容量の他端に与える制御信号を非アクティブ状態からアクティブ状態に切り替えることによって駆動トランジスタのソース電極に対して電位変化を与える、
請求項2に記載の表示装置。 - 駆動トランジスタのソース電極に対して電位変化を与えたときの駆動トランジスタのソース電圧は、少なくとも、発光部のカソード電圧+発光部の閾値電圧よりも小さい電圧である、
請求項1に記載の表示装置。 - 書込みトランジスタは、駆動トランジスタのソース電極に対して電位変化が与えられた後に、駆動トランジスタのゲート電極に信号電圧を書き込む、
請求項1に記載の表示装置。 - 書込みトランジスタを走査線を通して行単位で駆動する書込み走査部を備え、
制御部と書込み走査部とは、画素アレイ部に関して同じ側の周辺回路領域に設けられている、
請求項3に記載の表示装置。 - 制御線及び走査線は、配線の材料、厚み、及び、幅が同じである、
請求項6に記載の表示装置。 - 書込み走査信号は、閾値補正処理の際及び信号電圧の書込みの際の2回アクティブ状態となり、
書込み走査信号が2回アクティブ状態となるときの2つのパルスのパルス幅は同じである、
請求項1に記載の表示装置。 - 画素回路は、2つのパルスのうち2つ目のパルスの期間において、駆動トランジスタに流れる電流に応じた補正量で駆動トランジスタのゲート-ソース間の電位差に負帰還をかけることによって駆動トランジスタの移動度を補正する移動度補正処理を行う、
請求項8に記載の表示装置。 - 発光部、映像信号の信号電圧を書き込む書込みトランジスタ、書込みトランジスタによって書き込まれた信号電圧を保持する保持容量、保持容量が保持する信号電圧に基づいて発光部を駆動する駆動トランジスタ、及び、駆動トランジスタのソースノードに一端が接続された補助容量を含む画素回路が行列状に配置されて成り、
画素回路は、駆動トランジスタのゲート電圧の初期化電圧を基準として当該初期化電圧から駆動トランジスタの閾値電圧を減じた電圧に向けて、駆動トランジスタのソース電圧を変化させる閾値補正処理の機能を有する画素アレイ部を備える表示装置の駆動に当たって、
閾値補正処理後に、補助容量を通してのカップリングにより駆動トランジスタのソース電極に対して電位変化を与えて駆動トランジスタの動作点をカットオフ領域とする、
表示装置の駆動方法。 - 発光部、映像信号の信号電圧を書き込む書込みトランジスタ、書込みトランジスタによって書き込まれた信号電圧を保持する保持容量、保持容量が保持する信号電圧に基づいて発光部を駆動する駆動トランジスタ、及び、駆動トランジスタのソースノードに一端が接続された補助容量を含む画素回路が行列状に配置されて成り、
画素回路は、駆動トランジスタのゲート電圧の初期化電圧を基準として当該初期化電圧から駆動トランジスタの閾値電圧を減じた電圧に向けて、駆動トランジスタのソース電圧を変化させる閾値補正処理の機能を有する画素アレイ部と、
閾値補正処理後に、補助容量を通してのカップリングにより駆動トランジスタのソース電極に対して電位変化を与えて駆動トランジスタの動作点をカットオフ領域とする制御部と、
を備える表示装置を有する電子機器。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016557478A JP6593339B2 (ja) | 2014-11-04 | 2015-08-31 | 表示装置、表示装置の駆動方法、及び、電子機器 |
US15/510,461 US10140924B2 (en) | 2014-11-04 | 2015-08-31 | Display device, method for driving display device, and electronic device |
CN201580058235.9A CN107077817B (zh) | 2014-11-04 | 2015-08-31 | 显示装置、用于驱动显示装置的方法和电子装置 |
US16/177,962 US10475387B2 (en) | 2014-11-04 | 2018-11-01 | Display device, method for driving display device, and electronic device with offset voltage supplied through data line |
US16/655,818 US20200051505A1 (en) | 2014-11-04 | 2019-10-17 | Display device, method for driving display device, and electronic device |
US17/375,672 US11735112B2 (en) | 2014-11-04 | 2021-07-14 | Display device, method for driving display device, and electronic device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-224096 | 2014-11-04 | ||
JP2014224096 | 2014-11-04 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/510,461 A-371-Of-International US10140924B2 (en) | 2014-11-04 | 2015-08-31 | Display device, method for driving display device, and electronic device |
US16/177,962 Continuation US10475387B2 (en) | 2014-11-04 | 2018-11-01 | Display device, method for driving display device, and electronic device with offset voltage supplied through data line |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2016072139A1 true WO2016072139A1 (ja) | 2016-05-12 |
Family
ID=55908869
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2015/074700 WO2016072139A1 (ja) | 2014-11-04 | 2015-08-31 | 表示装置、表示装置の駆動方法、及び、電子機器 |
Country Status (4)
Country | Link |
---|---|
US (4) | US10140924B2 (ja) |
JP (1) | JP6593339B2 (ja) |
CN (3) | CN112785982A (ja) |
WO (1) | WO2016072139A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3493187A4 (en) * | 2016-07-29 | 2020-01-01 | Boe Technology Group Co. Ltd. | DRIVING CIRCUIT, DISPLAY PANEL, DISPLAY DEVICE AND DRIVING METHOD |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11302248B2 (en) * | 2019-01-29 | 2022-04-12 | Osram Opto Semiconductors Gmbh | U-led, u-led device, display and method for the same |
WO2020261367A1 (ja) * | 2019-06-25 | 2020-12-30 | シャープ株式会社 | 表示装置およびその駆動方法 |
US11444132B2 (en) * | 2019-11-29 | 2022-09-13 | Hefei Boe Joint Technology Co., Ltd. | Display substrate having gate extension portion protruding from gate electrode of first transistor, display device and manufacturing method the same thereof |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009204979A (ja) * | 2008-02-28 | 2009-09-10 | Sony Corp | El表示パネル、電子機器及びel表示パネルの駆動方法 |
WO2011061800A1 (ja) * | 2009-11-19 | 2011-05-26 | パナソニック株式会社 | 表示パネル装置、表示装置及びその制御方法 |
JP2012242772A (ja) * | 2011-05-24 | 2012-12-10 | Sony Corp | 表示装置、表示装置の駆動方法、及び、電子機器 |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002099248A (ja) * | 2000-09-22 | 2002-04-05 | Toshiba Corp | 情報処理装置及びバックライト制御方法 |
TW591564B (en) * | 2002-04-24 | 2004-06-11 | Sanyo Electric Co | Display device |
JP2008026468A (ja) * | 2006-07-19 | 2008-02-07 | Sony Corp | 画像表示装置 |
JP5055879B2 (ja) * | 2006-08-02 | 2012-10-24 | ソニー株式会社 | 表示装置および表示装置の駆動方法 |
JP4211820B2 (ja) * | 2006-08-15 | 2009-01-21 | ソニー株式会社 | 画素回路と画像表示装置及びその駆動方法 |
JP4281019B2 (ja) * | 2007-02-19 | 2009-06-17 | ソニー株式会社 | ディスプレイ装置 |
JP2008203706A (ja) * | 2007-02-22 | 2008-09-04 | Sony Corp | 表示装置、表示装置の駆動方法および電子機器 |
US8682292B2 (en) * | 2007-06-29 | 2014-03-25 | Vodafone Group Plc | Controlling the use of access points in a telecommunications network |
JP5067134B2 (ja) * | 2007-11-13 | 2012-11-07 | ソニー株式会社 | 表示装置及び表示装置の駆動方法 |
JP2009169090A (ja) * | 2008-01-16 | 2009-07-30 | Sony Corp | 自発光型表示装置およびその駆動方法 |
JP2009251545A (ja) * | 2008-04-11 | 2009-10-29 | Sony Corp | 表示装置、表示装置の駆動方法および電子機器 |
JP4640472B2 (ja) * | 2008-08-19 | 2011-03-02 | ソニー株式会社 | 表示装置、表示駆動方法 |
JP2010091720A (ja) * | 2008-10-07 | 2010-04-22 | Sony Corp | 表示装置、表示駆動方法 |
JP5287210B2 (ja) * | 2008-12-17 | 2013-09-11 | ソニー株式会社 | 表示装置および電子機器 |
JP2010281914A (ja) * | 2009-06-03 | 2010-12-16 | Sony Corp | 表示装置、表示装置の駆動方法および電子機器 |
JP2011064957A (ja) | 2009-09-17 | 2011-03-31 | Sony Corp | 表示装置および電子機器 |
KR101097487B1 (ko) | 2009-11-19 | 2011-12-22 | 파나소닉 주식회사 | 표시 패널 장치, 표시 장치 및 그 제어 방법 |
JP2011145481A (ja) * | 2010-01-14 | 2011-07-28 | Sony Corp | 表示装置、表示駆動方法 |
JP2011175103A (ja) * | 2010-02-24 | 2011-09-08 | Sony Corp | 画素回路、表示装置およびその駆動方法ならびに電子機器 |
JP2011209614A (ja) * | 2010-03-30 | 2011-10-20 | Sony Corp | 表示装置、表示装置の駆動方法、及び、電子機器 |
JP2012137513A (ja) * | 2010-12-24 | 2012-07-19 | Sony Corp | 信号処理装置および表示装置 |
JP5842263B2 (ja) | 2011-06-08 | 2016-01-13 | 株式会社Joled | 表示素子、表示装置、及び、電子機器 |
JP5842264B2 (ja) | 2011-06-08 | 2016-01-13 | 株式会社Joled | 表示装置、及び、電子機器 |
JP2012255907A (ja) * | 2011-06-09 | 2012-12-27 | Sony Corp | 画素回路、表示装置、電子機器、及び、画素回路の駆動方法 |
KR101342210B1 (ko) * | 2011-10-14 | 2013-12-16 | 삼성전자주식회사 | 휴대단말기의 화면밝기 제어장치 및 방법 |
KR101903568B1 (ko) * | 2012-07-19 | 2018-10-04 | 삼성디스플레이 주식회사 | 표시 장치 |
JP5789585B2 (ja) * | 2012-10-18 | 2015-10-07 | 株式会社Joled | 表示装置および電子機器 |
TW201426709A (zh) * | 2012-12-26 | 2014-07-01 | Sony Corp | 顯示裝置、顯示裝置之驅動方法及電子機器 |
KR20150114020A (ko) | 2014-03-31 | 2015-10-12 | 삼성디스플레이 주식회사 | 유기 발광 표시 장치 및 유기 발광 표시 장치의 구동 방법 |
-
2015
- 2015-08-31 WO PCT/JP2015/074700 patent/WO2016072139A1/ja active Application Filing
- 2015-08-31 JP JP2016557478A patent/JP6593339B2/ja not_active Expired - Fee Related
- 2015-08-31 US US15/510,461 patent/US10140924B2/en not_active Expired - Fee Related
- 2015-08-31 CN CN202110188047.5A patent/CN112785982A/zh active Pending
- 2015-08-31 CN CN201580058235.9A patent/CN107077817B/zh active Active
- 2015-08-31 CN CN202110188055.XA patent/CN112785983A/zh active Pending
-
2018
- 2018-11-01 US US16/177,962 patent/US10475387B2/en active Active
-
2019
- 2019-10-17 US US16/655,818 patent/US20200051505A1/en not_active Abandoned
-
2021
- 2021-07-14 US US17/375,672 patent/US11735112B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009204979A (ja) * | 2008-02-28 | 2009-09-10 | Sony Corp | El表示パネル、電子機器及びel表示パネルの駆動方法 |
WO2011061800A1 (ja) * | 2009-11-19 | 2011-05-26 | パナソニック株式会社 | 表示パネル装置、表示装置及びその制御方法 |
JP2012242772A (ja) * | 2011-05-24 | 2012-12-10 | Sony Corp | 表示装置、表示装置の駆動方法、及び、電子機器 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3493187A4 (en) * | 2016-07-29 | 2020-01-01 | Boe Technology Group Co. Ltd. | DRIVING CIRCUIT, DISPLAY PANEL, DISPLAY DEVICE AND DRIVING METHOD |
Also Published As
Publication number | Publication date |
---|---|
JP6593339B2 (ja) | 2019-10-23 |
US20200051505A1 (en) | 2020-02-13 |
CN107077817A (zh) | 2017-08-18 |
US20190073959A1 (en) | 2019-03-07 |
CN107077817B (zh) | 2021-03-05 |
JPWO2016072139A1 (ja) | 2017-08-17 |
CN112785983A (zh) | 2021-05-11 |
US10140924B2 (en) | 2018-11-27 |
US20170287402A1 (en) | 2017-10-05 |
US10475387B2 (en) | 2019-11-12 |
US11735112B2 (en) | 2023-08-22 |
CN112785982A (zh) | 2021-05-11 |
US20210343244A1 (en) | 2021-11-04 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2016072140A1 (ja) | 表示装置、表示装置の駆動方法、及び、電子機器 | |
US11705070B2 (en) | Display apparatus and electronic apparatus | |
JP5830761B2 (ja) | 表示装置及び電子機器 | |
US11735112B2 (en) | Display device, method for driving display device, and electronic device | |
JP2010281993A (ja) | 表示装置、表示装置の駆動方法および電子機器 | |
WO2016203841A1 (ja) | 表示装置及び電子機器 | |
JP2014160203A (ja) | 表示装置およびその駆動方法、並びに電子機器 | |
WO2018047492A1 (ja) | 表示装置及び電子機器 | |
JP2012243971A (ja) | ブートストラップ回路、インバータ回路、走査回路、表示装置、及び、電子機器 | |
JP6867737B2 (ja) | 表示装置及び電子機器 | |
JP2012208318A (ja) | パルス生成回路、パルス生成方法、走査回路、表示装置、及び、電子機器 | |
US20140218270A1 (en) | Display device, driving method of display device, and electronic apparatus | |
JP2012168359A (ja) | 走査回路、表示装置、表示装置の駆動方法、及び、電子機器 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 15857393 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2016557478 Country of ref document: JP Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 15510461 Country of ref document: US |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 15857393 Country of ref document: EP Kind code of ref document: A1 |