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公开(公告)号：US10522090B2
公开(公告)日：2019-12-31
申请号：US15562920
申请日：2016-03-25
IPC分类号： G09G3/3291 , G09G3/3233 , G09G3/3258 , H01L27/12 , H01L29/786
摘要： A display device that is configured to include two independent shift registers and is capable of performing a monitoring process without causing the degradation of display quality or the occurrence of abnormal operation is implemented. In a display device including: a writing control shift register composed of a plurality of first unit circuits (30) each including a first boost circuit (320) and a first output node reset circuit (330); and a monitoring control shift register composed of a plurality of second unit circuits (40) each including a second boost circuit (420) and a second output node reset circuit (430), current drive capability of the first boost circuit (320) is higher than current drive capability of the second boost circuit (420), and current drive capability of the second output node reset circuit (430) is higher than current drive capability of the first output node reset circuit (330).
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公开(公告)号：US10319305B2
公开(公告)日：2019-06-11
申请号：US15550117
申请日：2016-02-03
发明人： Noritaka Kishi , Hiroyuki Furukawa , Katsuya Otoi , Kazuyoshi Yoshiyama , Tamotsu Sakai , Naoko Gotoh
IPC分类号： G09G3/3258 , G09G3/20 , G09G3/30 , G09G3/3266 , G09G3/3291 , G09G3/3233
摘要： A current measurement circuit measures a current flowing through a drive transistor when a plurality of measurement voltages are written to a pixel circuit in a switching manner, and a current flowing through an organic EL element when another plurality of measurement voltages are written to the pixel circuit in a switching manner. A correction unit obtains a threshold voltage and a gain of the drive transistor and the organic EL element with respect to each pixel circuit based on a measured current, determines in which operation region the drive transistor operates between a saturation region and a triode region with respect to each pixel circuit based on the video signal, and corrects the video signal in accordance with the operation region of the drive transistor. Since the drive transistor operates both in the saturation region and the triode region, it is possible to reduce a power supply voltage and reduce power consumption of a display device.
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公开(公告)号：US10311791B2
公开(公告)日：2019-06-04
申请号：US15579989
申请日：2016-06-29
发明人： Masanori Ohara , Hideki Uchida , Katsuhiro Kikuchi , Satoshi Inoue , Yuto Tsukamoto , Eiji Koike , Kazuo Takizawa , Noboru Noguchi , Noritaka Kishi
IPC分类号： G09G3/325 , G09G3/3233 , H01L51/50 , G09G3/3266
摘要： The purpose of the present invention is to suppress the fluctuation of a data line voltage that occurs when an analog voltage signal is sampled and held in a data line in a display device provided with a current-driven display element. Transistors (SWr, SWG, SWb) of each demultiplexer (252) are successively switched on, for each predetermined period, in a selection period of a write control line (SW_LR(i)). In a period when the transistor (SWr) is switched on, an analog video signal (Dj) from a data voltage output unit circuit (211d) is applied to a data line (SLrj) and a pixel circuit (50r). When the transistor SWr is then switched off, the voltage held by the data line (SLrj) decreases below the voltage of the analog video signal (Dj) due to a parasitic capacitance (Cssdr). However, the voltage of a voltage fluctuation compensation line (G3_Cnt (i)) changes from a low level to a high level within the selection period. This causes the voltage of the data line (SLrj) to rise via a capacitor (Ccnt), and the decrease in voltage to be compensated for.
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公开(公告)号：US10304385B2
公开(公告)日：2019-05-28
申请号：US16042345
申请日：2018-07-23
发明人： Kazuo Takizawa , Noritaka Kishi
IPC分类号： G09G3/3233 , G09G3/3291
摘要： An object of the present invention is to implement a display device capable of compensating for degradation of circuit elements without causing a grayscale failure. Based on the results of detection of characteristics of drive transistors and organic EL elements, a control circuit (20) finds magnitudes of threshold shifts of the drive transistors and the organic EL elements. A power supply voltage control unit (201) sets a value of a low-level power supply voltage (ELVSS) to a value lower, by a voltage value corresponding to an average value of the magnitudes of the threshold shifts for all pixels, than a value at an initial point in time. Furthermore, the power supply voltage control unit (201) adjusts a value of a high-level power supply voltage (ELVDD), depending on magnitudes of mobilities obtained by detection of characteristics of the drive transistors.
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公开(公告)号：US09711092B2
公开(公告)日：2017-07-18
申请号：US14764206
申请日：2014-03-05
发明人： Noritaka Kishi
IPC分类号： G09G3/32 , G09G3/34 , G09G3/3225 , G09G3/3291 , H01L27/32
CPC分类号： G09G3/3233 , G09G3/3225 , G09G3/3283 , G09G3/3291 , G09G3/3406 , G09G2300/043 , G09G2300/0861 , G09G2310/08 , G09G2320/0233 , G09G2320/0276 , G09G2320/041 , G09G2320/045 , H01L27/3241
摘要： 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.
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公开(公告)号：US09466239B2
公开(公告)日：2016-10-11
申请号：US14358720
申请日：2012-11-09
发明人： Noritaka Kishi
CPC分类号： G09G3/30 , G09G3/3233 , G09G2300/0819 , G09G2300/0842 , G09G2300/0866 , G09G2310/0218 , H01L27/3244
摘要： 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.
摘要翻译： 像素电路10包括四个TFT11至14，电容器15和有机EL元件16.在连接TFT 11和电容器15的节点A和电源线VPk之间设置TFT 14 的电容器。 TFT14的栅极端子连接到控制线Ek。 TFT14在有机EL元件16的发光时段中处于导通状态。电源线VPk和控制线Ek和AZk以多行连接到像素电路10。 显示装置同时对多行中的像素电路10进行初始化，同时对多行中的像素电路10执行阈值检测，逐行地将数据写入像素电路10，并且使有机EL元件16 包括在多行中的像素电路10中的同一周期中发光。
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公开(公告)号：US09881552B2
公开(公告)日：2018-01-30
申请号：US15426329
申请日：2017-02-07
发明人： Noritaka Kishi
IPC分类号： G09G3/3283 , G09G3/3233
CPC分类号： G09G3/3233 , G09G3/3225 , G09G3/3283 , G09G3/3291 , G09G3/3406 , G09G2300/043 , G09G2300/0861 , G09G2310/08 , G09G2320/0233 , G09G2320/0276 , G09G2320/041 , G09G2320/045 , H01L27/3241
摘要： 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 detecting a characteristic of the drive transistor; detecting a characteristic of the electro-optic element; storing characteristic data obtained based on detection results in the first and second detection of characteristics of the drive transistor and electro-optic element, as correction data; and correcting the video signal based on the correction data.
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公开(公告)号：US09842545B2
公开(公告)日：2017-12-12
申请号：US15037712
申请日：2014-08-20
发明人： Noritaka Kishi
IPC分类号： G09G3/3283 , G09G3/3233 , G09G3/325
CPC分类号： G09G3/3283 , G09G3/3233 , G09G3/325 , G09G2300/0426 , G09G2300/0819 , G09G2300/0842 , G09G2310/0262 , G09G2320/0295 , G09G2320/043 , G09G2320/045 , G09G2320/046 , G09G2320/0633 , G09G2330/028
摘要： A display device that can compensate for degradation of circuit elements while suppressing an increase in circuit size is implemented.A data signal line (S(j)) is not only used as a signal line that transfers a signal for allowing an organic EL element (OLED) in each pixel circuit (11) to emit light at a desired luminance, but also used as a signal line for characteristic detection. In addition, a switch (334) is provided between the data signal line (S(j)) and an internal data line (Sin(j)). In such a configuration, during an AD conversion period during which analog data obtained for characteristic detection is converted into digital data, the switch (334) is brought into an off state and a potential of the data signal line (S(j)) obtained immediately before the AD conversion period is supplied from through a predetermined control line (CL) to the data signal line (S(j)).
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公开(公告)号：US09837023B2
公开(公告)日：2017-12-05
申请号：US15639242
申请日：2017-06-30
IPC分类号： G09G3/32 , G09G3/3258 , G09G3/3275 , G09G3/3225 , G09G3/3291 , G09G3/3283
CPC分类号： G09G3/3258 , G09G3/3225 , G09G3/3275 , G09G3/3283 , G09G3/3291 , G09G2300/0819 , G09G2300/0852 , G09G2300/0861 , G09G2300/0866 , G09G2310/0259 , G09G2320/0242
摘要： In a pixel circuit, TFTs are connected and driven such that a threshold voltage Vth of a TFT, which is a drive transistor, can be held in a threshold holding capacitor 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 having a capacitance value c2, and charges in the data holding capacitor and the threshold holding capacitor 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.
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公开(公告)号：US09792858B2
公开(公告)日：2017-10-17
申请号：US15321340
申请日：2015-06-23
发明人： Daichi Nishikawa , Noritaka Kishi , Masanori Ohara
IPC分类号： G09G3/3233 , G11C19/00 , G09G3/3266 , G09G3/3283
CPC分类号： G09G3/3233 , G09G3/3266 , G09G3/3283 , G09G2300/043 , G09G2300/0842 , G09G2310/0202 , G09G2310/0262 , G09G2310/027 , G09G2310/0286 , G09G2320/0285 , G09G2320/0295 , G09G2320/045 , G09G2320/0646 , G09G2320/0693 , G11C19/00 , G11C19/28
摘要： A scanning line drive circuit includes a shift register having stages, hold circuits, and scanning signal output circuits. The hold circuit holds a shift register output in accordance with a sampling signal which is in an active level in one line period in a video signal period. The scanning signal output circuit outputs a scanning signal to be applied to scanning lines based on the shift register output, a hold output, a period specifying signal indicating whether it is in the video signal period or in a vertical flyback period, and timing signals. The scanning signal output circuit outputs a scanning signal for measurement and writing when the hold output is in a selection level in the vertical flyback period. It is possible to select a scanning line corresponding to the pixel circuits in one row and measure currents or voltages in the vertical flyback period, using a simple circuit.
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