Abstract: Provided is a driving method whereby it is possible to simultaneously compensate for both degradation of a drive transistor and degradation of a light-emitting element without causing special light emission at the time of detecting characteristics in a display device. In a display device which includes a pixel circuit including an electro-optic element and a drive transistor, a driving method includes: a first characteristic detection step for detecting a characteristic of the drive transistor; a second characteristic detection step for detecting a characteristic of the electro-optic element; a correction data storage step for storing characteristic data obtained based on detection results in the first and second characteristic detection steps as correction data; and a video signal correction step for correcting the video signal based on the correction data. The second characteristic detection step is performed in a light emission period.

Abstract: An embodiment of the present invention realizes a display device equipped with a self light-emitting type display element driven by a current, by using a pixel circuit having a configuration simpler than a conventional configuration. A pixel circuit includes a driving transistor (T1), an input transistor (T2), a capacitor (Cst), and three organic EL elements (OLED(R), OLED(G), and OLED(B)). Cathode terminals of the organic EL elements (OLED(R), OLED(G), and OLED(B)) are respectively connected to low-level power supply lines (ELVSS(R), ELVSS(G), and ELVSS(B)). In such a configuration, in each sub-frame, only a low-level power supply voltage (ELVSS) corresponding to the sub-frame is set to a relatively low level, and the other low-level power supply voltages (ELVSS) are set to relatively high levels.

Abstract: A detection output circuit provided in a source driver compares a voltage detected by a resistor and a voltage of a driving signal using comparators drives a transistor, a capacitor and an operational amplifier using a ramp signal so that they are maintained at voltages corresponding to a current flowing through a data line, and performs feedback control so that the potential of the data line is a desired potential. With this simple configuration, a data line circuit can be achieved that is capable of eliminating variation in driving transistor characteristics and the like, while performing current protection at high speed.

Abstract: An organic EL display device includes a controller, a data driver, and a DRAM which provides a gain correction memory and a threshold voltage correction memory. The data driver sends, to the controller, first and second measurement data Im corresponding to the first and second measuring data voltages Vm, respectively. The controller compares ideal characteristic data IO(P) with the first and second measurement data Im, and updates threshold voltage correction data Vt and gain correction data B2R based on the comparison results. The controller corrects video data Vm based on the threshold voltage correction data Vt and the gain correction data B2R. Thereby, both threshold voltage compensation and gain compensation of a drive transistor are performed with respect to each pixel circuit, while display is performed.

Abstract: An organic EL display device includes an emission driver that has an ON-control transistor (T1e) and an OFF-control transistor (T2e) for each emission line. The ON-control transistor (T1e) in the i-th row has its gate terminal and drain terminal connected to the scanning line (Si+1) in the (i+1)th row whereas its source terminal is connected to the emission line (EMi) in the i-th row. The OFF-control transistor (T2e) in the i-th row has its gate terminal connected to the scanning line (Si?1) in the (i?1)th row, whereas its drain terminal is connected to the emission line (EMi) in the i-th row, and its source terminal is connected to a LOW level logic power supply line (VSS).

Abstract: A pixel circuit is capable of maintaining a display quality even in cases where an input transistor has a low mobility, or where it is impossible to take a sufficient selection period for each scanning line. A pixel circuit includes an organic EL element (OLED), transistors, and a capacitor. A drive transistor has its drain terminal connected to a HIGH level power supply line, and has its source terminal connected to an anode terminal of the OLED. The first input transistor has its gate terminal connected to a scanning line Si, and is disposed between a data line Dj and the gate terminal of the drive transistor. The second input transistor has its gate terminal connected to a scanning line (Si-1) in the (i?1)th row, and is disposed between a data line and the gate terminal of the drive transistor. The capacitor is disposed between the gate terminal and the source terminal of the drive transistor.

Abstract: A gate driver divides n scanning lines (G1 to Gn) into p blocks (BL1 to BLp), and provides for each block, a common selection period for selecting a whole or a part of k scanning lines included in the block, and a scanning period for sequentially selecting k scanning lines included in the block. A source driver (30) detects a characteristic of a driving transistor via a data line from a pixel circuit (11) corresponding to a scanning line that is being selected in the common selection period, and supplies to the data line a corrected data voltage that has been obtained by correcting the data voltage based on the detected characteristic of the driving transistor. Accordingly, there is provided a display device that can compensate for a characteristic variation of the driving transistor while solving a shortage of writing time.

Abstract: A display device (100) includes a plurality of pixel circuits (10), a gate driver circuit (2) coupled to a plurality of scanning signal lines Gi and a plurality of control lines Ei, and a power control circuit (4) coupled to a plurality of power lines VPi via a common power line. The pixel circuits (10) each include an organic EL element, a plurality of TFTs, and a capacitor, and are controlled to collectively receive initialization potentials at the beginning of a frame through the power lines VPi, collectively perform threshold detection immediately thereafter, and then perform writing and light-emission operations. Thus, the aperture ratio of the pixel circuits (10) can be kept high, the power control circuit (4) typically has only one output buffer so that the circuit scale thereof is small, drive by potential is performed only once, so that power consumption is low, and threshold detection is performed only once, so that a sufficient amount of time can be ensured for a detection period.

Abstract: In a display device including a driving transistor a driving current flows in accordance with a signal voltage supplied via a data line, so that gray scale display in accordance with the signal voltage is carried out. An electro-optical element emits light in response to the driving current. The driving transistor is provided with a signal voltage at displaying a center gray scale among all display gray scale levels within a voltage region in which the driving current in a temperature range of 0° C. to 40° C. is in a range of 98% to 102% of a driving current that flows at an average driving temperature.

Abstract: Provided is a display device that can sufficiently secure a period for threshold value detection with a simple configuration and that can inhibit occurrence of luminance non-uniformity. The display device includes a plurality of pixel circuits; a gate driver circuit connected to a plurality of scanning signal lines and a plurality of control lines; and a power control circuit connected to a plurality of power lines through a common power line. Each pixel circuit includes an organic EL element, a plurality of TFTs, and a capacitor. During each frame period, after initialization and threshold value detection are collectively performed on a plurality of rows, writing and light emission are performed sequentially on a row-by-row basis. Here, in a preceding frame (first frame) of two consecutive frame periods, writing is performed in order from the first row to the nth row (ascending order).

Abstract: In a pixel circuit (10), TFTs (12) to (16) are connected and driven such that a threshold voltage Vth of a TFT (11), which is a drive transistor, can be held in a threshold holding capacitor (19) having a capacitance value c1, voltages, including a data potential Vdata representing an image to be displayed, can be held in a data holding capacitor (18) having a capacitance value c2, and charges in the data holding capacitor (18) and the threshold holding capacitor (19) are redistributed at the time of light emission. As a result, a potential obtained by multiplying the data potential Vdata by c1/(c1+c2) is provided to a gate potential of the TFT (11).

Abstract: A pixel circuit 10 includes four TFTs 11 to 14, a capacitor 15, and an organic EL element 16. Between a node A where the TFT 11 and the capacitor 15 are connected and a power supply line VPk, the TFT 14 is provided in place of a capacitor. The gate terminal of the TFT 14 is connected to a control line Ek. The TFT 14 is in an on state in a light emission period of the organic EL element 16. The power supply line VPk and control lines Ek and AZk are connected to the pixel circuits 10 in a plurality of rows. A display device simultaneously performs initialization to the pixel circuits 10 in the plurality of rows, simultaneously performs threshold detection to the pixel circuits 10 in the plurality of rows, sequentially writes data to the pixel circuits 10 row by row, and makes organic EL elements 16 included in the pixel circuits 10 in the plurality of rows emit light in the same period.

Abstract: A pixel circuit 10 is provided with TFTs 12 and 13 and an organic EL element 15 on a current path connecting a power supply line VPk and an electrode having a common potential Vcom. A display device 100 simultaneously performs initialization to pixel circuits 10 in a plurality of rows, simultaneously perform threshold detection to the pixel circuits 10 in the plurality of rows, sequentially writes data to the pixel circuits 10 row by row, and makes the organic EL elements 15 included in the pixel circuits 10 in the plurality of rows emit light in the same period. In a period from completion of threshold detection to start of light emission, the TFTs 11 and 13 are controlled to an off state, and a potential VP_C which is substantially equal to the common potential Vcom is applied to the power supply line VPk. Consequently, leak current flowing through the TFTs 12 and 13 can be suppressed, and the fluctuation in the node potential in the pixel circuit 10 in a standby period can be prevented.

Abstract: A pixel circuit includes an organic EL element, a driving, and a switching provided between the gate and drain of the driving. Upon writing into the pixel circuit, an initial voltage is applied to the gate terminal of the driving, and the switching is temporarily controlled to a conducting state while the driving is in a conducting state, and a data voltage corrected using a gate terminal potential of the driving obtained at that time is applied to the gate terminal of the driving. In at least one embodiment, the human is sensitive to blue chromaticity differences but is insensitive to green chromaticity differences. An initial voltage that increases the accuracy of threshold correction is used for blue pixel circuits, and an initial voltage that reduces power consumption is used for green pixel circuits. By this, a current-driven type color display device with high image quality and low power consumption is provided.

Abstract: An electric current driving display device includes pixel circuits, a scanning signal output circuit and a display signal output circuit. The pixel circuits include intersecting scanning lines and data lines. Each pixel circuit includes an electro-optical element and a drive element having a control terminal connected to the data line through a switching element. The scanning signal output circuit selects a write-target pixel circuit using the scanning line, and controls the selected pixel circuit outputs, to the data line, a voltage which depends on a threshold voltage of the drive element. The display signal output circuit applies, to the data line, a voltage obtained by adding or subtracting a correction voltage corresponding to the threshold voltage to or from a data voltage corresponding to display data, based on the voltage outputted to the data line.

Abstract: A display device including: pixels, each provided with first to fourth transistors, a light-emitting element, a control terminal of the fourth transistors is connected to a scanning line, a second electrically-conductive terminal of the second transistor, a first electrically-conductive terminal of the third transistor, a control terminal of the third transistor are connected to each other; and a second control line (AZC) shared commonly by at least two pixels. The at least two pixels being such that the fourth transistors of the at least two pixels are connected to different scanning lines, and second electrically-conductive terminals of the third transistors of the at least two pixels are connected to the second control line, the at least two pixels being such that the third transistors of the at least two pixels are concurrently turned ON, after the first transistors of the at least two pixels are sequentially turned OFF.

Abstract: The present invention achieves a display device capable of quick compensation of charging of parasitic capacitance with a simple configuration and low power consumption. The display device in accordance with the present invention includes (i) pixels, (ii) signal wires (Sj), and (iii) an operational amplifier (OP1) having a non-inverting input terminal connected with a corresponding signal wire (Sj). The operational amplifier (OP1) is configured such that: the non-inverting input terminal is connected with an output terminal (OUT) via a first impedance element (R1); an inverting input terminal is connected with the output terminal (OUT) via a second impedance element (R2); and the inverting input terminal is connected with a reference voltage terminal via a third impedance element (Cn).

Abstract: A pixel array substrate includes: a first through fourth transistors (Ta through Td); a light-emitting element (OEL); a scanning line connected with a control terminal of the fourth transistor; a data line connected with one conducting terminal of the fourth transistor; a first control line (AZi) connected with one conducting terminal of the third transistor; a second control line (Ei) connected with a control terminal of the first transistor; and a first power source line (Ypj) connected with one conducting terminal of the first transistor. One conducting terminal of the second transistor is connected with the first power source line via the first transistor. A control terminal of the second transistor is connected with the data line via the fourth transistor and with a terminal of the light-emitting element via a capacitor (C).

Abstract: A pixel circuit (6) is driven in an impulse mode in which an organic EL diode (7) emits light only during a selection period, or in a hold mode in which the organic EL diode (7) emits the light not during the selection period but after the selection period. Moreover, the pixel circuit (6) is provided with a programmed current source (I1) for lower-side gray scale display and a programmed current source (I2) for higher-side gray scale display, the pixel circuit (6) being supplied with a programmed current (I) from the programmed current source (I1) when the pixel circuit (6) is driven in the impulse mode, and a programmed current (I?) from the programmed current source (I2) when the pixel circuit (6) is driven in the hold mode.

Abstract: Provided is a display device that can sufficiently secure a period for threshold value detection with a simple configuration and that can inhibit occurrence of luminance non-uniformity. The display device includes a plurality of pixel circuits; a gate driver circuit connected to a plurality of scanning signal lines and a plurality of control lines; and a power control circuit connected to a plurality of power lines through a common power line. Each pixel circuit includes an organic EL element, a plurality of TFTs, and a capacitor. During each frame period, after initialization and threshold value detection are collectively performed on a plurality of rows, writing and light emission are performed sequentially on a row-by-row basis. Here, in a preceding frame (first frame) of two consecutive frame periods, writing is performed in order from the first row to the nth row (ascending order).