WO2016035295A1 - 表示装置及びその駆動方法 - Google Patents
表示装置及びその駆動方法 Download PDFInfo
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- WO2016035295A1 WO2016035295A1 PCT/JP2015/004319 JP2015004319W WO2016035295A1 WO 2016035295 A1 WO2016035295 A1 WO 2016035295A1 JP 2015004319 W JP2015004319 W JP 2015004319W WO 2016035295 A1 WO2016035295 A1 WO 2016035295A1
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- current
- emitting element
- gradation signal
- pixel
- light emitting
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Images
Classifications
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- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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- G09G3/20—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
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- 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
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- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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- G09G2300/04—Structural and physical details of display devices
- G09G2300/0421—Structural details of the set of electrodes
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- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
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- G—PHYSICS
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- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/025—Reduction of instantaneous peaks of current
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
Definitions
- the present disclosure relates to a display device and a driving method thereof, and more particularly, to a display device using a current-driven light emitting element and a driving method thereof.
- organic electroluminescence elements (hereinafter referred to as “organic EL elements”) having self-luminous emission, high viewing angle, and high-speed response have attracted attention.
- the display device includes a display panel on which organic EL elements are arranged and a drive circuit that drives the organic EL elements.
- the display panel has a first electrode such as Al on a substrate such as glass, a second electrode such as a metal thin film such as ITO (Indium Tin Oxide) and magnesium (Aluminum, Silver), and the like.
- An organic EL element provided with a light emitting layer therebetween is arranged in a matrix.
- the drive circuit is provided between the substrate and the first electrode, and is composed of a thin film transistor (TFT) that individually drives the organic EL elements.
- TFT thin film transistor
- a bottom emission method in which light emitted from an organic EL element is extracted to the outside through a substrate and a top emission method in which the light is emitted from the second electrode side facing the substrate are being studied.
- a thin film transistor of a driver circuit is formed over a substrate, so that it is difficult to ensure a sufficient aperture ratio.
- the aperture ratio of the top emission method is not limited by a thin film transistor or the like, the use efficiency of the emitted light can be increased as compared with the bottom emission method.
- the second electrode since light is extracted to the outside through the second electrode formed on the top surface of the light emitting layer, the second electrode is required to have high conductivity and high light transmittance.
- metal oxides such as ITO and metal thin films such as magnesium, aluminum, and silver are generally used as transparent conductive materials used for the second electrode, but metal oxides and thin film metals are used for wiring and the like. The resistivity is higher than that of the metal layer.
- the larger the display panel the more the difference in the wiring length of the second electrode between the light emitting pixels, and a large voltage drop occurs between the end of the power supply unit and the center of the panel, and the luminance accordingly Because there is a difference, the center becomes dark. That is, there is a problem that the luminance varies depending on the arrangement position of the organic EL elements on the display panel surface, and the display quality is deteriorated.
- a first electrode made of a conductive material having low resistivity and an auxiliary wiring are separately provided on a substrate, and a light modulation layer that is a light emitting layer is provided on the first electrode.
- a second electrode made of a transparent conductive material is provided thereon. The auxiliary wiring and the second electrode are connected via a buffer layer provided on the auxiliary wiring.
- the bootstrap amount is defined as the voltage fluctuation of the source electrode that varies according to the voltage applied between the gate and the source of the driving transistor, the organic EL element from the completion of data writing to the start of the light emission period is defined.
- the bootstrap amount of the connected drive transistor is affected by the current flowing in other organic EL elements sharing the current path composed of the auxiliary wiring and the second electrode. Therefore, in the display device described in Patent Document 1, a desired current cannot be supplied to each organic EL element. For example, consider the case where the organic EL elements of the sub-pixels for red, green, and blue display in one pixel in the display device share a current path composed of the auxiliary wiring and the second electrode. In this case, due to the bootstrap described above, a desired current does not flow through each organic EL element, and the color balance displayed by the pixel may differ from the desired color balance. In other words, the color expression power of the entire display device may be deteriorated.
- the present invention has been made to solve the above problem, and provides a display device and a driving method thereof in which the influence of the current flowing through the light emitting elements of each pixel from the current flowing through the light emitting elements of other pixels is reduced. For the purpose.
- a method for driving a display device includes a control circuit that outputs a first grayscale signal and a second grayscale signal, and a current-driven light-emitting element.
- One light emitting element a first pixel having a first driving transistor for supplying a first current corresponding to the first gradation signal to the first light emitting element, and a current driving type
- a second pixel having a second light emitting element which is a light emitting element and a second driving transistor for supplying a second current corresponding to the second grayscale signal to the second light emitting element;
- a display device, and a power supply unit that applies a power supply voltage to the first pixel and the second pixel through a current path common to the first pixel and the second pixel.
- the driving method includes the first current and the first current. Are supplied simultaneously to the first light emitting element and the second light emitting element, respectively, so as to compensate for the decrease in the first current due to the voltage drop generated in the current path. And correcting the first gradation signal based on the second gradation signal and the second gradation signal.
- the display device it is possible to provide a display device in which the influence of the current flowing through the light emitting elements of each pixel from the current flowing through the light emitting elements of other pixels is reduced, and a driving method thereof.
- FIG. 1 is a functional block diagram illustrating an overall configuration of a display device according to an embodiment.
- FIG. 2 is a partial plan view illustrating the display unit according to the embodiment.
- FIG. 3 is a cross-sectional view taken along the line A-A ′ of FIG.
- FIG. 4 is a cross-sectional view taken along line B-B ′ of FIG.
- FIG. 5 is a diagram illustrating an example of a circuit configuration of a pixel according to the embodiment.
- FIG. 6 is a block diagram illustrating a calculation method for correcting a gradation signal in the control circuit according to the embodiment.
- FIG. 7 is a graph showing the relationship between the pixel current sum Ipix and the R current ratio before and after the correction is applied to the gradation signal.
- FIG. 1 is a functional block diagram illustrating an overall configuration of a display device according to an embodiment.
- FIG. 2 is a partial plan view illustrating the display unit according to the embodiment.
- FIG. 3 is a cross-section
- FIG. 8 is a graph showing the relationship between the pixel current sum Ipix and the G current ratio before and after the correction is applied to the gradation signal.
- FIG. 9 is a graph showing the relationship between the pixel current sum Ipix and the B current ratio before and after the correction is applied to the gradation signal.
- FIG. 10 is an external view of a thin flat TV incorporating the display device according to the embodiment.
- FIG. 1 is a functional block diagram showing the overall configuration of the display device according to the present embodiment.
- the display device 1 includes a display unit 2, a power supply unit 3, a data line driving circuit 40, a scanning line driving circuit 50, and a control circuit 60.
- the display unit 2 is a display panel in which pixels 20 having organic EL elements and circuit elements for driving the organic EL elements to emit light are arranged in a matrix.
- the power supply unit 3 supplies a power supply voltage to each pixel 20 from a power supply line 30 arranged in the outer peripheral region of the display unit 2.
- the power supply line 30 includes a positive voltage power supply line that transmits a positive power supply voltage and a negative voltage power supply line that transmits a negative power supply voltage that is lower in potential than the positive power supply voltage.
- the control circuit 60 is a main part of the display device 1 according to the present embodiment, generates a gradation signal corresponding to the emission intensity of each organic EL element based on a video signal input from the outside, and generates the generated floor.
- the adjustment signal is output to the data line driving circuit 40.
- the control circuit 60 generates a control signal S5 for controlling the scanning line driving circuit 50 based on the input synchronization signal, and outputs the generated control signal S5 to the scanning line driving circuit 50.
- the control circuit 60 will be described later in detail.
- the data line driving circuit 40 drives the data lines of the display unit 2 based on the gradation signal generated by the control circuit 60. More specifically, the data line driving circuit 40 outputs a data voltage reflecting the video signal to each pixel circuit based on the video signal and the horizontal synchronization signal.
- the scanning line driving circuit 50 drives the scanning lines of the display unit 2 based on the control signal S5 generated by the control circuit 60. More specifically, the scanning line driving circuit 50 outputs a scanning signal or the like to each pixel circuit based on the vertical synchronizing signal and the horizontal synchronizing signal at least for each display line.
- FIG. 2 is a partial plan view for explaining the display unit 2 according to the present embodiment.
- 3 is a cross-sectional view taken along the line AA ′ in FIG. 2
- FIG. 4 is a cross-sectional view taken along the line BB ′ in FIG.
- FIG. 2 shows a part of the display unit 2 including one pixel 20.
- the pixel 20 includes, for example, a red display sub-pixel 20R, a green display sub-pixel 20G, a blue display sub-pixel 20B, and a connection portion 20C. . Further, in FIG.
- anodes 121 arranged separately for each subpixel, banks 122 provided for each subpixel column and partitioning the subpixels, and auxiliary wirings arranged for each pixel 20 are provided.
- 131 and a via 120 that electrically connects the drive circuit layer and the anode 121 are shown.
- the sub-pixel 20 ⁇ / b> G includes a substrate 10, a drive circuit layer 11 provided on the substrate 10, and an organic EL layer 12 provided on the drive circuit layer 11.
- the display device 1 can be given bendability.
- a plastic substrate such as polyethylene terephthalate or polyethersulfone
- an opaque plastic substrate or a ceramic substrate can be used.
- the drive circuit layer 11 is a layer in which circuit elements for driving the organic EL elements to emit light are formed. Examples of the circuit elements include thin film transistors (hereinafter referred to as TFTs).
- the drive circuit layer 11 includes, for example, a gate electrode 111, a gate insulating layer 112, a semiconductor layer 113, a source electrode 114, a drain electrode 115, an interlayer insulating layer 116, and a via 120.
- the organic EL layer 12 includes an anode 121, a bank 122, a hole injection layer 123, a hole transport layer 124, an organic light emitting layer 125, an electron transport layer 126, and a transparent cathode 127.
- the anode 121 is a first electrode formed on the interlayer insulating layer 116 and spaced apart for each sub-pixel.
- the anode 121 is integrally formed with the via 120 for connecting to the source electrode 114 of the driving transistor.
- it does not specifically limit as the anode 121 and the via
- the anode 121 and the via 120 include silver, aluminum, nickel, chromium, molybdenum, copper, iron, platinum, tungsten, lead, tin, antimony, strontium, titanium, manganese, indium, zinc, vanadium, tantalum, niobium, Any one of lanthanum, cerium, neodymium, samarium, europium, palladium, copper, and cobalt, an alloy of these metals, or a laminate of them can be used.
- the bank 122 is a partition that is provided for each sub-pixel column and partitions the sub-pixels.
- a resin material such as polyimide resin can be used.
- carbon particles may be included in the resin.
- the hole injection layer 123 is formed on the anode 121 and separated by the bank 122 for each sub-pixel.
- the hole injecting layer 123 is a layer mainly composed of a hole injecting material, and the hole injecting material is a hole injecting from the anode 121 side stably or generating holes. Is a material having a function of injecting into the organic light emitting layer 125 with assistance.
- PEDOT polyethylenedioxythiophene
- the hole transport layer 124 is formed on the hole injection layer 123 and separated from each other by the bank 122 for each sub-pixel.
- the hole transport layer 124 has a function of transporting holes injected from the hole injection layer 123 into the organic light emitting layer 125.
- a hole transporting organic material can be used as the hole transport layer 124.
- the hole transporting organic material is an organic substance having a property of transferring generated holes by intermolecular charge transfer reaction. This is sometimes called a p-type organic semiconductor.
- the hole transport layer 124 may be a high molecular material or a low molecular material, but it is preferable that the hole transport layer 124 can be formed by a wet printing method, so that it is difficult to elute into the organic light emitting layer 125 when the upper layer is formed. It is preferable that a crosslinking agent is included.
- An example of the hole transporting material is not particularly limited, but an aromatic amine can be used, and a triphenylamine derivative and a triarylamine derivative are preferably used.
- the crosslinking agent dipentaerythritol hexaacrylate or the like can be used.
- the film forming method for forming the hole transport layer 124 is not particularly limited, and a nozzle jet method represented by an ink jet method and a dispenser method can be used.
- the ink jet method is a method for forming the hole transport layer 124 by ejecting an ink-formed organic film forming material from a nozzle.
- the organic light emitting layer 125 is formed on the hole transport layer 124 and is separated from the sub pixel by the bank 122.
- the organic light emitting layer 125 is a layer that emits light when a voltage is applied between the anode 121 and the transparent cathode 127, and the organic light emitting layer 125 is made of a low molecular or high molecular weight organic light emitting material. it can.
- a polymer light-emitting material for example, a polymer light-emitting material such as polyparaphenylene vinylene (PPV) or polyfluorene can be used.
- the electron transport layer 126 is an intermediate layer mainly composed of an electron transport material, which extends on the organic light emitting layer 125 and straddles the bank 122 and extends above the auxiliary wiring 131 described later with reference to FIG. It is.
- the material having an electron transporting property has both the property of being an electron acceptor and easily becoming an anion, and the property of transferring generated electrons by a charge transfer reaction between molecules, and the charge from the transparent cathode 127 to the organic light emitting layer 125.
- Examples of the electron transport layer 126 include oxadiazole derivatives such as 1,3-bis (4-tert-butylphenyl-1,3,4-oxadiazolyl) phenylene (OXD-7), anthraquinodimethane derivatives, and diphenyl.
- oxadiazole derivatives such as 1,3-bis (4-tert-butylphenyl-1,3,4-oxadiazolyl) phenylene (OXD-7), anthraquinodimethane derivatives, and diphenyl.
- Polymer materials such as quinone derivatives and silole derivatives, bis (2-methyl-8-quinolinolate)-(para-phenylphenolate) aluminum (BAlq), bathopproin (BCP), and the like are used.
- the electron transport layer 126 extended above the auxiliary wiring 131 and the electron transport layer 126 on the anode 121 are not necessarily continuous.
- the electron transport layer 126 that is not continuously formed is an electron transport layer 126 that can be separated and formed by the same film forming process at the light emitting portion and the connection portion without using a continuous high-definition mask. Examples include those that are separated and formed by the bank 122 when the film is formed.
- the transparent cathode 127 is a second electrode that is formed on the entire surface of all the pixels 20 on the electron transport layer 126, straddling the bank 122, extending above the auxiliary wiring 131 described later with reference to FIG. It is a transparent electrode provided continuously in each pixel 20.
- the transparent cathode 127 is not particularly limited, but in the case of a top emission method, it is preferable to use a thin film of metal such as indium tin oxide, indium zinc oxide, magnesium, aluminum, or silver.
- an electron injection layer may be formed between the electron transport layer 126 and the transparent cathode 127.
- the electron injection layer is a layer mainly composed of an electron injecting material.
- the electron injecting material is a material having a function of injecting electrons injected from the transparent cathode 127 into the organic light emitting layer 125 stably or by assisting generation of electrons.
- the display unit 2 emits light generated by recombination of electrons and holes injected into the organic light emitting layer 125 from the transparent cathode 127 side.
- the pixel 20 is an area adjacent to the sub-pixel 20 ⁇ / b> R, and the auxiliary wiring 131 is disposed between the sub-pixel 20 ⁇ / b> R and the sub-pixel included in the other pixel 20.
- a connecting portion 20C is provided.
- the auxiliary wiring 131 is formed on the drive circuit layer 11 so as to be separated from the anode 121.
- an electron transport layer 126 and a transparent cathode 127 extending from above the anode 121 are formed.
- the anode 121 and the organic light emitting layer 125 are provided separately for each subpixel, and the auxiliary wiring 131 is disposed for each pixel column. Thereby, the wiring resistance depending on the distance from the power supply line 30 is reduced, and the fluctuation of the pixel driving voltage is suppressed.
- auxiliary wiring 131 may be disposed not for each pixel column but for each pixel row, or may be disposed for each pixel column and each pixel row.
- the auxiliary wiring 131 Due to the laminated structure of the auxiliary wiring 131, the electron transport layer 126 and the transparent cathode 127 shown in FIG. 4, from the drive transistor of the drive circuit layer 11, the anode 121, the hole injection layer 123, the hole transport layer 124, the organic light emitting layer 125. , And the pixel currents Ipix (R), Ipix (G), and Ipix (B) that flow to the transparent cathode 127 via the electron transport layer 126 further on the auxiliary wiring 131 as indicated by arrows in FIG. It flows into the electron transport layer 126 and the auxiliary wiring 131.
- a voltage drop corresponding to the sum Ipix of the pixel currents Ipix (R), Ipix (G) and Ipix (B) shown in FIG. 4 occurs at the connection portion 20C between the transparent cathode 127 and the auxiliary wiring 131.
- the auxiliary wiring 131 is not particularly limited, but is preferably made of the same material as that of the anode 121 because it can be formed in the same process as the formation of the anode 121.
- the intermediate layer sandwiched between the auxiliary wiring 131 and the transparent cathode 127 shown in FIG. 4 is not limited to the electron transport layer 126.
- As an intermediate layer configuration between the auxiliary wiring 131 and the transparent cathode 127 at least a hole injection layer 123, a hole transport layer 124, an organic light emitting layer 125, an electron transport layer 126, and an electron injection layer (not shown) are used. It can be assumed that either is included. However, in this case, it is desirable that the layer structure does not block the flow of the current in the direction in which the pixel current flows.
- FIG. 5 is a diagram illustrating an example of a circuit configuration of a pixel according to this embodiment.
- the sub-pixel 20R shown in the figure includes a drive circuit layer 11 and an organic EL layer 12.
- the drive circuit layer 11 includes a data line 212, a scan line 211, a positive power supply wiring 221, a switch transistor 203, a drive transistor 202, and a storage capacitor element 204.
- the organic EL layer 12 includes an organic EL element 201.
- the subpixels 20G and 20B shown in FIG. 5 also have the same circuit configuration as the subpixel 20R, but in FIG. 5, the description of the circuit configuration of the drive circuit layer 11 of the subpixels 20G and 20B is omitted. Yes.
- the pixels 20 including the sub-pixel 20R, the sub-pixel 20G, and the sub-pixel 20B are arranged in a matrix on the display unit 2.
- the switch transistor 203 is, for example, an n-type TFT in which one of the source and the drain is connected to the data line 212 and the other of the source and the drain is connected to the gate of the driving transistor 202 and one end of the storage capacitor element 204.
- the drive transistor 202 is, for example, an n-type TFT having a drain connected to the positive power supply wiring 221, a source connected to the anode of the organic EL element 201, and a gate connected to one end of the storage capacitor element 204.
- the drive transistor 202 supplies a current corresponding to the voltage held in the holding capacitor element 204 to the organic EL element 201. That is, the drive transistor 202 supplies a current corresponding to the gradation signal (and data voltage) to the organic EL element 201.
- the other end of the holding capacitor element 204 is connected to the source of the driving transistor 202 and holds a voltage corresponding to the data voltage supplied from the data line 212.
- the data line 212 connects the data line driving circuit 40 (not shown) and one of the source and drain of the switch transistor 203, and a data voltage corresponding to the video signal is applied by the data line driving circuit 40.
- the scanning line 211 connects the scanning line driving circuit 50 and the gate of the switch transistor 203, and makes the switching transistor 203 conductive and non-conductive according to the voltage applied by the scanning line driving circuit 50.
- the organic EL element 201 is a light emitting element formed in the organic EL layer 12.
- the anode (anode 121) of the organic EL element 201 is connected to the source of the driving transistor 202 via the via 120, and the cathode (transparent cathode 127) is connected to the auxiliary wiring 131 via the intermediate layer (electron transport layer 126).
- the organic EL element 201 emits light with a luminance corresponding to the value of the current flowing between the anode and the cathode.
- the transparent cathode 127 that is the cathode electrode of the organic EL element 201 is provided in common to all the pixels 20, and the negative power supply voltage VEL is applied from the power supply line 30 provided in the outer peripheral region of the display unit 2. As described above, the power supply unit 3 is electrically connected via the feeder line 30.
- the power supply voltage supplied by the power supply unit 3 includes a positive power supply voltage VDD supplied to the drain of the drive transistor 202 and a negative power supply voltage VEL supplied to the cathode of the organic EL element 201.
- the positive power supply voltage VDD is supplied from the power supply unit 3 to the anode 121 and the positive power supply wiring 221 to which the drain of the driving transistor 202 is connected via the power supply line 30 (positive voltage power supply line).
- the transparent cathode 127 that is the cathode of the organic EL element 201 is connected to the transparent cathode 127 from the power supply unit 3 via the auxiliary wiring 131 and the power supply line 30 (negative voltage power supply line) that are current paths common to the sub-pixels included in the pixel 20.
- Negative power supply voltage VEL is supplied.
- the power supply voltage supplied by the power supply unit 3 is defined as a positive power supply voltage VDD and a negative power supply voltage VEL
- the positive power supply voltage VDD means a voltage having a higher potential than the negative power supply voltage VEL. This means that the voltage is lower than the positive power supply voltage VDD. That is, the positive power supply voltage VDD and the negative power supply voltage VEL are not limited to having a positive voltage value and a negative voltage value, respectively.
- an intermediate layer resistor Rip that is an electron transport layer 126 is inserted in series between the cathode of the organic EL element 201 and the auxiliary wiring 131.
- the pixel currents Ipix (R), Ipix (G), and Ipix (B) are supplied from the driving transistor 202 of the driving circuit layer 11 to the anode 121, It flows to the common transparent cathode 127 via the organic EL element 201.
- the pixel currents Ipix (R), Ipix (G), and Ipix (B) flow into the resistor Rip and the auxiliary wiring 131 which are common current paths. Accordingly, the voltage drop amount Vdrop generated between the transparent cathode 127 and the auxiliary wiring 131 is an amount corresponding to the sum Ipix of the pixel currents Ipix (R), Ipix (G) and Ipix (B) and the resistance Rip. As the voltage drop amount Vdrop varies, the amount of bootstrap in each drive transistor 202 of the sub-pixels 20R, 20G, and 20B varies, so the amount of current flowing through each organic EL element 201 varies.
- Control circuit 60 In the control circuit 60 according to the present embodiment, in order to suppress fluctuations in the amount of current flowing through each organic EL element 201 due to fluctuations in the voltage drop Vdrop generated between the transparent cathode 127 and the auxiliary wiring 131, A configuration for correcting the adjustment signal is provided.
- FIG. 6 is a block diagram showing a calculation method for correcting the gradation signal in the control circuit 60 according to the present embodiment.
- the gradation signals GL R and GL G corresponding to the data voltages Vdata (R), Vdata (G) and Vdata (B) applied to the sub-pixels 20R, 20G and 20B in one pixel 20.
- amends GL B is shown.
- control circuit 60 functionally includes a current calculation unit 300, a voltage drop amount calculation unit 400, a correction amount calculation unit 500, and an addition unit 600.
- the current calculation unit 300 calculates a sum Ipix of pixel currents Ipix (R), Ipix (G), and Ipix (B) that simultaneously flow in the sub-pixels corresponding to the gradation signals GL R , GL G, and GL B. It is.
- the pixel current that flows when the data voltage corresponding to the gradation signal is applied is calculated. That is, the pixel current is calculated when it is assumed that the resistance from the transparent cathode 127 to the feeder line 30 is zero.
- the current calculation unit 300 uses the LUTs (Look-Up Tables) 301, 302, and 303 that indicate the correspondence between the grayscale signal and the pixel current when the voltage drop amount Vdrop is zero, and uses the pixel current Ipix (R ), Ipix (G) and Ipix (B). Then, the sum Ipix of the pixel current is calculated.
- LUTs Look-Up Tables
- the relationship between the gradation signal GL R , the data voltage Vdata (R), and the pixel current Ipix (R) with respect to various voltage drop amounts Vdrop is obtained by measurement. From this relationship, the relationship among the gradation signal GL R , the data voltage Vdata (R), and the pixel current Ipix (R) when the voltage drop amount Vdrop is zero is estimated. From the estimated relationship, an LUT 301 indicating a correspondence relationship between the gradation signal and the pixel current when the voltage drop amount Vdrop is zero is created. The LUTs 302 and 303 are created in the same manner as the LUT 301.
- the relationship of the pixel current Ipix with respect to the data voltage Vdata when the voltage drop amount Vdrop is zero may be obtained by operation simulation of the pixel circuit.
- V R (GL R ), V G (GL G ), and V B (GL B ) indicate functions for obtaining a data voltage corresponding to the gradation signal.
- the function may not be stored in each LUT.
- each LUT may store only a table indicating the relationship between the gradation signal and the data voltage. The same applies to each function shown below.
- the pixel current Ipix (R) that flows when the data voltage is applied to the sub-pixel 20R is obtained from the LUT 301.
- pixel currents Ipix (G) and Ipix (B) corresponding to the gradation signals GL G and GL B are obtained from the LUTs 302 and 303, respectively.
- I R Vdata (R)
- I G Vdata (G)
- I B Vdata (B)
- Ipix increases as the video gradation signal GL increases.
- the pixel current sum Ipix is obtained by adding the pixel currents Ipix (R), Ipix (G) and Ipix (B) obtained as described above as shown in the following equation.
- the voltage drop amount calculation unit 400 is a calculation unit that calculates the voltage drop amount Vdrop generated between the transparent cathode 127 and the auxiliary wiring 131 using the pixel current sum Ipix calculated by the current calculation unit 300.
- the voltage drop amount Vdrop is calculated using the LUT 401 indicating the relationship between the pixel current sum Ipix and the voltage drop amount Vdrop.
- the LUT 401 may be created by measuring characteristics using a display device in advance, or may be created by estimating from the characteristics of a sample having the same structure using a TEG or the like.
- the relationship between the pixel current sum Ipix and the voltage drop Vdrop is expressed by the following equation.
- V (Ipix) represents a function for obtaining a voltage drop amount Vdrop corresponding to the sum Ipix of pixel currents.
- Vdrop is larger as Ipix is larger.
- the correction amount calculation unit 500 is a calculation unit that calculates the correction amount of each data voltage.
- the correction amount is a correction amount for compensating for a decrease in each pixel current due to a voltage drop generated between the transparent cathode 127 and the auxiliary wiring 131.
- the correction amount calculation unit 500 converts each gradation signal into a data voltage.
- the correction amount calculation unit 500 uses the LUTs 501, 502, and 503 that indicate the relationship between the data voltages Vdata (R), Vdata (G), and Vdata (B) and the data voltage correction coefficients corresponding to the data voltages Vdata (R), Vdata (G), and Vdata (B). Find the correction factor for the data voltage.
- the LUTs 501, 502, and 503 are based on the data voltage adjustment amount ⁇ Vdata required to keep the pixel current Ipix constant when the cathode potential changes by unit voltage ⁇ Vcat (for example, 1 V) under various data voltage Vdata conditions.
- the obtained parameters are ⁇ Vdata / ⁇ Vcat, and may be created by measurement in the same manner as each of the above LUTs, or may be obtained by creating an operation simulation of the pixel circuit.
- the correction amount calculation unit 500 multiplies the correction coefficient by the voltage drop amount Vdrop obtained by the voltage drop amount calculation unit 400. Accordingly, correction amounts Vcomp (R), Vcomp (G), and Vcomp (B) for the data voltages Vdata (R), Vdata (G), and Vdata (B) are obtained.
- the calculation in the correction amount calculation unit 500 is expressed by the following equation.
- ⁇ Vcat is a change amount of the cathode potential, and is a value corresponding to the voltage drop amount Vdrop.
- the coefficient multiplied by the voltage drop amount Vdrop indicates the data voltage correction coefficient.
- Vdrop increases as Ipix increases, and since Formula 1 is a function of monotonic increase or monotonic decrease, Vcomp increases as GL increases.
- the addition unit 600 is a calculation unit that converts the correction amount of the data voltage obtained by the correction amount calculation unit 500 into a correction amount of the gradation signal and adds it to the gradation signals GL R , GL G, and GL B before correction. is there. Assuming that the corrected gradation signals GL ′ R , GL ′ G, and GL ′ B calculated by the adding unit 600 are expressed by the following equations.
- the control circuit 60 corrects the gradation signals GL R , GL G, and GL B to GL ′ R , GL ′ G, and GL ′ B , respectively.
- the corrected gradation signal is input to the data line driving circuit 40, the corrected data voltage is applied to each data line 212, and a pixel current corresponding to the corrected data voltage flows.
- fluctuations in the pixel currents Ipix (R), Ipix (G), and Ipix (B) due to fluctuations in the voltage drop amount Vdrop are suppressed.
- FIG. 7 shows the sum of pixel currents Ipix (R), Ipix (G), and Ipix (B) flowing through the organic EL elements 201 of the sub-pixels 20R, 20G, and 20B before and after the correction is applied to the gradation signal.
- the R current ratio in FIG. 7 is the predetermined current voltage applied to the subpixel 20R with respect to Ipix (R) when a predetermined data voltage is applied to the subpixel 20R and current flows only through the organic EL element 201 of the subpixel 20R.
- the R current ratio is 0.8 or more (ie, 80 % Or more). That is, when gray level signal GL R is each having a plurality of medium luminance least is R current ratio is 80% or more. 8 and 9, similarly, when the pixel currents Ipix (G) and Ipix (B) are respectively medium or higher, the G current ratio and the B current ratio are 0.8 or more (that is, 80%). Above).
- each current ratio is maintained at 0.8 or more, that is, if the current ratio reduction rate is maintained at less than 20%, it is sufficient for the user to sense the decrease in each pixel current. Can be suppressed.
- the current ratio after applying the correction may vary depending on the LUT used in the correction. For example, it is possible to create an LUT so that all the current ratios after correction are applied are 0.8 or more (that is, the current ratio is 0.8 or more even in a low luminance region). By using such an LUT, it is possible to sufficiently prevent the user from perceiving a decrease in each pixel current in the entire luminance region.
- one mode of the driving method of the display device 1 according to the present embodiment includes the control circuit 60 that outputs the grayscale signals GL R , GL G, and GL B , the organic EL element 201, and the gray scale.
- the display unit 2 including the sub-pixel 20B having the driving transistor 202 and the sub-pixel 2 via a current path common to the sub-pixels 20R, 20G, and 20B.
- a power supply unit 3 that applies a power supply voltage to 0R, 20G, and 20B.
- the driving method when the currents Ipix (R), Ipix (G), and Ipix (B) are simultaneously supplied to the organic EL elements 201, the current Ipix is caused by a voltage drop generated in the common current path.
- R a step of correcting the gradation signals GL R , GL G and GL B based on the gradation signals GL R , GL G and GL B so as to compensate for the decrease in Ipix (G) and Ipix (B). including.
- the influence that the current flowing through the organic EL element 201 of each sub-pixel receives from the current flowing through the organic EL element 201 of another sub-pixel is reduced. That is, a desired current corresponding to the gradation signal can be supplied to the organic EL element 201 of each subpixel. Therefore, deterioration of color expression due to the above-described influence in the pixel 20 including the sub-pixels 20R, 20G, and 20B is reduced.
- the correcting step is based on the gradation signal GL R , GL G and GL B to obtain a voltage drop amount Vdrop generated in the connecting portion 20C which is the current path, and on the basis of the voltage drop amount Vdrop. and a step of determining the amount of correcting the gradation signal GL R may.
- the organic EL elements 201 of the sub-pixels 20R, 20G, and 20B share one transparent cathode 127, and the current path includes an auxiliary wiring 131 that is electrically connected to the transparent cathode 127, and includes a voltage drop amount Vdrop. May be the amount of voltage drop generated at the connecting portion 20 ⁇ / b> C between the transparent cathode 127 and the auxiliary wiring 131.
- the voltage drop at the connection portion 20C is predominant, by correcting the gray level signal GL R based on the amount of the voltage drop The gradation signal can be corrected appropriately.
- each current Ipix when each of the organic EL elements 201 of the sub-pixels 20R, 20G, and 20B is supplied with currents corresponding to the gradation signals GL R , GL G, and GL B at the same time.
- (R), Ipix (G), and Ipix (B) are only one of the gradation signals GL R , GL G, and GL B for only one of the organic EL elements 201 of the sub-pixels 20R, 20G, and 20B, respectively.
- the first gradation signal is set to 80% or more of a current (one of Ipix (R), Ipix (G), and Ipix (B)) when a current corresponding to the current is supplied. It may be corrected.
- currents corresponding to the gradation signals GL R , GL G and GL B are simultaneously supplied to the organic EL elements 201 of the sub-pixels 20R, 20G and 20B, respectively, and each gradation signal
- Each current Ipix (R), Ipix (G), and Ipix (B) in the case where is a gray level of medium luminance or higher is assigned to any one of the organic EL elements 201 of the sub-pixels 20R, 20G, and 20B.
- the first gradation signal may be corrected so as to achieve the above.
- the luminance of the organic EL element is equal to or higher than the medium luminance, it is possible to sufficiently suppress the user from sensing the decrease in each pixel current.
- an example of suppressing the influence of the current flowing in the organic EL element 201 included in another sub-pixel included in each of the organic EL elements 201 included in the sub-pixels 20R, 20G, and 20B included in the pixel 20 is suppressed.
- the present invention is not limited to this.
- a current flowing through an organic EL element included in a pixel of a display device flows through an organic EL element of an arbitrary pixel or sub-pixel to which a power supply voltage is applied via a current path having a resistance component common to the pixel. It can be applied to suppress the influence of current.
- the voltage drop is generated in the connection portion 20C between the transparent cathode 127 and the auxiliary wiring 131.
- the voltage drop may be generated in another current path portion.
- a voltage drop may occur due to a resistance component such as a power supply line.
- the configuration of the organic EL layer 12 has been described by way of example of anode / hole injection layer / hole transport layer / organic light emitting layer / electron transport layer / cathode, but is not limited thereto.
- the organic EL layer may be configured to include at least an organic light emitting layer, an anode, and a cathode.
- a configuration including at least one of a hole injection layer, a hole transport layer, an electron transport layer, and an electron injection layer may be employed.
- the electron transport layer 126 is formed between the transparent cathode 127 and the auxiliary wiring 131 .
- the electron transport layer 126 may not be formed.
- a voltage drop occurs between the transparent cathode 127 and the auxiliary wiring 131.
- the configuration in which the influence due to the fluctuation of the voltage drop (rise) of the negative power supply voltage VEL in the transparent cathode 127 continuously formed in the display unit 2 is illustrated.
- the configuration of the present invention is not limited to this, and due to the circuit configuration, the light emission method, the laminated structure of the organic EL layer, and the like, for example, in the top emission of the anode common, the influence due to the fluctuation of the voltage drop of the positive power supply voltage VDD by the anode 121 is affected.
- the structure which reduces is also contained in this invention.
- the pixel 20 is described as including three sub-pixels 20R, 20G, and 20B.
- the pixel configuration is not limited to this.
- the pixel 20 does not have a plurality of sub-pixels and is configured by one pixel, when the plurality of pixels are applied with a power supply voltage from the power supply unit 3 through a common current path, this The invention can be applied.
- the LUT is used to correct the gradation signal.
- a correction function other than the LUT may be prepared in advance, and the gradation signal may be corrected using the correction function.
- control circuit 60 corrects the gradation signal, but the data voltage may be corrected.
- the intermediate layer has been described as a part of the layer constituting the light emitting part, but the intermediate layer constituting the connection part does not have to be continuous with the layer constituting the light emitting part. .
- the intermediate layer can be separately formed at the light emitting portion and the connecting portion without using a high-definition mask.
- the intermediate layer may be separately formed by the bank 122 at the stage of coating and forming.
- the display device 1 according to the present embodiment is built in a thin flat TV as shown in FIG.
- the display device 1 according to the present embodiment realizes a thin flat TV having a high level of color expression.
- the present invention is useful for an organic EL flat panel display and is optimal for use as a display that requires color expressive power.
Abstract
Description
実施の形態における表示装置1について、図面を用いて説明する。
本実施の形態に係る表示装置1は、表示部2と、電源部3と、データ線駆動回路40と、走査線駆動回路50と、制御回路60とを備える。
図2は、本実施の形態に係る表示部2を説明する部分平面図である。また、図3は、図2のA-A’線に沿って切断した断面図であり、図4は、図2のB-B’線に沿って切断した断面図である。図2には、1つの画素20を含む表示部2の一部が表されている。画素20は、図2に示されるように、例えば、赤色表示用のサブ画素20Rと、緑色表示用のサブ画素20Gと、青色表示用のサブ画素20Bと、接続部20Cとを有している。また、図2には、サブ画素ごとに離間して配置された陽極121と、サブ画素列ごとに配置して設けられ、サブ画素を区画するバンク122と、画素20ごとに配置された補助配線131と、駆動回路層と陽極121とを電気接続するビア120とが表されている。
図5は、本実施の形態に係る画素の回路構成の一例を示す図である。同図に示されるサブ画素20Rは、駆動回路層11と、有機EL層12とを備える。駆動回路層11は、データ線212と、走査線211と、正電源配線221と、スイッチトランジスタ203と、駆動トランジスタ202と、保持容量素子204とを有する。また、有機EL層12は、有機EL素子201を有する。なお、図5に示されるサブ画素20G及び20Bも、サブ画素20Rと同様の回路構成を有するが、図5においては、サブ画素20G及び20Bの駆動回路層11の回路構成の記載は省略されている。サブ画素20R、サブ画素20G及びサブ画素20Bを含む画素20は、表示部2に、行列状に配置されている。
以下、本実施の形態の要部である制御回路60の構成について説明する。本実施の形態に係る制御回路60においては、透明陰極127と補助配線131との間において発生する電圧降下量Vdropの変動に伴う各有機EL素子201に流れる電流量の変動を抑制するために階調信号を補正する構成を備える。
次に、上述の階調信号補正を適用した場合における各サブ画素に流れる電流の測定結果について説明する。
以上のように、本実施の形態に係る表示装置1の駆動方法の一態様は、階調信号GLR、GLG及びGLBを出力する制御回路60と、有機EL素子201、及び、階調信号GLRに応じた電流Ipix(R)を有機EL素子201に供給するための駆動トランジスタ202を有するサブ画素20R、有機EL素子201、及び、階調信号GLGに応じた電流Ipix(G)を有機EL素子201に供給するための駆動トランジスタ202を有するサブ画素20G、並びに、有機EL素子201、及び、階調信号GLBに応じた電流Ipix(B)を有機EL素子201に供給するための駆動トランジスタ202を有するサブ画素20Bを備える表示部2と、サブ画素20R、20G及び20Bに共通する電流経路を介して、サブ画素20R、20G及び20Bに電源電圧を印加する電源部3と、を備える表示装置の駆動方法である。そして当該駆動方法は、電流Ipix(R)、Ipix(G)及びIpix(B)が、それぞれ各有機EL素子201に同時に供給される場合に、上記共通する電流経路において生じる電圧降下による、電流Ipix(R)、Ipix(G)及びIpix(B)の減少を補うように、階調信号GLR、GLG及びGLBに基づいて、階調信号GLR、GLG及びGLBを補正するステップを含む。
以上、本発明の表示装置及びその駆動方法について、実施の形態に基づいて説明してきたが、本発明に係る表示装置は、上記実施の形態に限定されるものではない。実施の形態における任意の構成要素を組み合わせて実現される別の実施の形態や、実施の形態に対して本発明の主旨を逸脱しない範囲で当業者が思いつく各種変形を施して得られる変形例や、本実施の形態に係る表示装置を内蔵した各種機器も本発明に含まれる。
2 表示部
3 電源部
10 基板
11 駆動回路層
12 有機EL層
20 画素
20B、20G、20R サブ画素
20C 接続部
30 給電線
40 データ線駆動回路
50 走査線駆動回路
60 制御回路
111 ゲート電極
112 ゲート絶縁層
113 半導体層
114 ソース電極
115 ドレイン電極
116 層間絶縁層
120 ビア
121 陽極
122 バンク
123 正孔注入層
124 正孔輸送層
125 有機発光層
126 電子輸送層
127 透明陰極
131 補助配線
201 有機EL素子
202 駆動トランジスタ
203 スイッチトランジスタ
204 保持容量素子
211 走査線
212 データ線
221 正電源配線
300 電流演算部
301、302、303、401、501、502、503 LUT
400 電圧降下量演算部
500 補正量演算部
600 加算部
Claims (18)
- 第1の階調信号及び第2の階調信号を出力する制御回路と、
電流駆動型発光素子である第1の発光素子、及び、前記第1の階調信号に応じた第1の電流を前記第1の発光素子に供給するための第1の駆動トランジスタを有する第1の画素、並びに、電流駆動型発光素子である第2の発光素子、及び、前記第2の階調信号に応じた第2の電流を前記第2の発光素子に供給するための第2の駆動トランジスタを有する第2の画素を備える表示部と、
前記第1の画素及び前記第2の画素に共通する電流経路を介して、前記第1の画素及び前記第2の画素に電源電圧を印加する電源部と、を備える表示装置の駆動方法であって、
前記駆動方法は、
前記第1の電流及び前記第2の電流が、それぞれ前記第1の発光素子及び前記第2の発光素子に同時に供給される場合に、前記電流経路において生じる電圧降下による、前記第1の電流の減少を補うように、前記第1の階調信号及び前記第2の階調信号に基づいて、前記第1の階調信号を補正するステップを含む
表示装置の駆動方法。 - 前記補正するステップは、
前記第1の階調信号及び前記第2の階調信号に基づいて、前記電流経路において生じる電圧降下量を求めるステップと、
前記電圧降下量に基づいて、前記第1の階調信号を補正する量を求めるステップとを含む
請求項1に記載の表示装置の駆動方法。 - 前記第1の発光素子及び前記第2の発光素子は、一方の電極を共有し、
前記電流経路は前記電極と電気的に接続された補助配線を含み、
前記電圧降下量は、前記電極から前記補助配線の間において発生する電圧降下の量である
請求項2に記載の表示装置の駆動方法。 - 前記電圧降下量は、前記第1の電流及び前記第2の電流の和と正の相関を有する
請求項2又は3に記載の表示装置の駆動方法。 - 前記第1の電流及び前記第2の電流は、それぞれ、前記第1の階調信号及び前記第2の階調信号と正の相関を有する
請求項1~4のいずれか1項に記載の表示装置の駆動方法。 - 前記第1の階調信号を補正するステップにおける前記第1の階調信号の補正量に対応する前記電源電圧の補正量は、前記第1の階調信号と正の相関を有する
請求項1~5のいずれか1項に記載の表示装置の駆動方法。 - 前記制御回路は、さらに第3の階調信号を出力し、
前記表示部は、電流駆動型発光素子である第3の発光素子、及び、前記第3の階調信号に応じた第3の電流を前記第3の発光素子に供給するための第3の駆動トランジスタを有する第3の画素をさらに備え、
前記電源部は、前記第1の画素、前記第2の画素及び前記第3の画素に共通する前記電流経路を介して、前記第1の画素、前記第2の画素及び前記第3の画素に前記電源電圧を印加し、
前記第1の発光素子、前記第2の発光素子及び前記第3の発光素子は、それぞれ、赤色表示用発光素子、緑色表示用発光素子及び青色表示用発光素子であり、
前記補正するステップは、前記第1の電流、前記第2の電流及び前記第3の電流が、それぞれ前記第1の発光素子、前記第2の発光素子及び前記第3の発光素子に同時に供給される場合に、前記電流経路において生じる電圧降下による、前記第1の電流の減少を補うように、前記第1の階調信号、前記第2の階調信号及び前記第3の階調信号に基づいて、前記第1の階調信号を補正するステップを含む
請求項1に記載の表示装置の駆動方法。 - 前記補正するステップにおいて、
前記第1の発光素子及び前記第2の発光素子に、それぞれ、前記第1の階調信号及び前記第2の階調信号に応じた電流が同時に供給される場合における前記第1の電流が、前記第1の発光素子だけに前記第1の階調信号に応じた電流が供給される場合における前記第1の電流の80%以上となるように、前記第1の階調信号を補正する
請求項1又は7に記載の表示装置の駆動方法。 - 前記補正するステップにおいて、
前記第1の発光素子及び前記第2の発光素子に、それぞれ、前記第1の階調信号及び前記第2の階調信号に応じた電流が同時に供給され、かつ、前記第1の階調信号が中輝度以上の階調である場合における前記第1の電流が、前記第1の発光素子だけに前記第1の階調信号に応じた電流が供給される場合における前記第1の電流の80%以上となるように、前記第1の階調信号を補正する
請求項1又は7に記載の表示装置の駆動方法。 - 第1の階調信号及び第2の階調信号を出力する制御回路と、
電流駆動型発光素子である第1の発光素子、及び、前記第1の階調信号に応じた第1の電流を前記第1の発光素子に供給するための第1の駆動トランジスタを有する第1の画素、並びに、電流駆動型発光素子である第2の発光素子、及び、前記第2の階調信号に応じた第2の電流を前記第2の発光素子に供給するための第2の駆動トランジスタを有する第2の画素を備える表示部と、
前記第1の画素及び前記第2の画素に共通する電流経路を介して、前記第1の画素及び前記第2の画素に電源電圧を印加する電源部と、を備える表示装置であって、
前記制御回路は、
前記第1の電流及び前記第2の電流が、それぞれ前記第1の発光素子及び前記第2の発光素子に同時に供給される場合に、前記電流経路において生じる電圧降下による、前記第1の電流の減少を補うように、前記第1の階調信号及び前記第2の階調信号に基づいて、前記第1の階調信号を補正する
表示装置。 - 前記制御回路は、
前記第1の階調信号及び前記第2の階調信号に基づいて、前記電流経路において生じる電圧降下量を求め、かつ、前記電圧降下量に基づいて、前記第1の階調信号を補正する量を求める
請求項10に記載の表示装置。 - 前記第1の発光素子及び前記第2の発光素子は、一方の電極を共有し、
前記電流経路は前記電極と電気的に接続された補助配線を含み、
前記電圧降下量は、前記電極から前記補助配線の間において発生する電圧降下の量である
請求項11に記載の表示装置。 - 前記電圧降下量は、前記第1の電流及び前記第2の電流の和と正の相関を有する
請求項11又は12に記載の表示装置。 - 前記第1の電流及び前記第2の電流は、それぞれ、前記第1の階調信号及び前記第2の階調信号と正の相関を有する
請求項10~13のいずれか1項に記載の表示装置。 - 前記第1の階調信号の補正量に対応する前記電源電圧の補正量は、前記第1の階調信号と正の相関を有する
請求項10~14のいずれか1項に記載の表示装置。 - 前記制御回路は、さらに第3の階調信号を出力し、
前記表示部は、電流駆動型発光素子である第3の発光素子、及び、前記第3の階調信号に応じた第3の電流を前記第3の発光素子に供給するための第3の駆動トランジスタを有する第3の画素をさらに備え、
前記電源部は、前記第1の画素、前記第2の画素及び前記第3の画素に共通する前記電流経路を介して、前記第1の画素、前記第2の画素及び前記第3の画素に前記電源電圧を印加し、
前記第1の発光素子、前記第2の発光素子及び前記第3の発光素子は、それぞれ、赤色表示用発光素子、緑色表示用発光素子及び青色表示用発光素子であり、
前記制御回路は、
前記第1の電流、前記第2の電流及び前記第3の電流が、それぞれ前記第1の発光素子、前記第2の発光素子及び前記第3の発光素子に同時に供給される場合に、前記電流経路において生じる電圧降下による、前記第1の電流の減少を補うように、前記第1の階調信号、前記第2の階調信号及び前記第3の階調信号に基づいて、前記第1の階調信号を補正する
請求項10に記載の表示装置。 - 前記制御回路は、
前記第1の発光素子及び前記第2の発光素子に、それぞれ、前記第1の階調信号及び前記第2の階調信号に応じた電流が同時に供給される場合における前記第1の電流が、前記第1の発光素子だけに前記第1の階調信号に応じた電流が供給される場合における前記第1の電流の80%以上となるように、前記第1の階調信号を補正する
請求項10又は16に記載の表示装置。 - 前記制御回路は、
前記第1の発光素子及び前記第2の発光素子に、それぞれ、前記第1の階調信号及び前記第2の階調信号に応じた電流が同時に供給され、かつ、前記第1の階調信号が中輝度以上の階調である場合における前記第1の電流が、前記第1の発光素子だけに前記第1の階調信号に応じた電流が供給される場合における前記第1の電流の80%以上となるように、前記第1の階調信号を補正する
請求項10又は16に記載の表示装置。
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