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    Display device
    16.
    发明授权
    Display device 有权

    公开(公告)号：US11626544B2

    公开(公告)日：2023-04-11

    申请号：US17260325

    申请日：2019-07-09

    Applicant: Semiconductor Energy Laboratory Co., Ltd.

    Inventor： Tomoya Aoyama ,  Koji Kusunoki ,  Kensuke Yoshizumi

    IPC: H01L33/50 ,  H01L27/15 ,  H01L33/46

    Abstract: A display device having high light-extraction efficiency is provided. A low-power display device is provided. In a red or green pixel included in the display device, a light-emitting element, an optically functional layer, and a wavelength-conversion layer are stacked in this order. The light-emitting element emits blue light, the optically functional layer transmits the blue light and reflects red and green light, and the wavelength-conversion layer converts the blue light into red or green light. The blue light emitted by the light-emitting element passes through the optically functional layer and enters the wavelength-conversion layer, and red or green light is emitted to the outside. The red or green light emitted from the wavelength-conversion layer to the optically functional layer side is reflected by the optically functional layer and emitted to the outside, which improves light-extraction efficiency.

    Method for operating display device
    17.
    发明授权
    Method for operating display device 有权

    公开(公告)号：US11508307B2

    公开(公告)日：2022-11-22

    申请号：US17273818

    申请日：2019-08-30

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Kei Takahashi ,  Koji Kusunoki ,  Kouhei Toyotaka ,  Susumu Kawashima ,  Kazunori Watanabe

    IPC: G09G3/3258 ,  H01L25/16 ,  H01L27/32

    Abstract: A display device that can correct the threshold voltage of a driving transistor without a correction of image data is provided. A display device including a pixel provided with a driving transistor, a display element, and a memory circuit and a correction data generation circuit is related. One of a source and a drain of the driving transistor is electrically connected to one electrode of the display element, and a gate of the driving transistor is electrically connected to the memory circuit. In a first period, the correction data generation circuit generates correction data that is data for correcting the threshold voltage of the driving transistor. In a second period, first data is written to the memory circuit. In a third period, second data is supplied to the pixel, whereby third data in which the second data is added to the first data is generated. In a fourth period, an image corresponding to the third data is displayed by the display element.

    Method for actuating display device
    18.
    发明授权
    Method for actuating display device 有权

    公开(公告)号：US11455940B2

    公开(公告)日：2022-09-27

    申请号：US17056687

    申请日：2019-05-27

    Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

    Inventor： Koji Kusunoki ,  Kei Takahashi ,  Toshiyuki Isa

    IPC: G09G3/32

    Abstract: A display device that inhibits display deterioration is provided. The display device estimates the amount of deterioration of a pixel included in the display device and corrects a first image signal supplied to the pixel. The display device includes a display panel including a plurality of pixels, a frame memory, and an arithmetic portion. The pixels each include a light-emitting element and a transistor supplying a current to the light-emitting element. The arithmetic portion has a function of performing an arithmetic operation in accordance with a regression model. A forecast error parameter and an output parameter are set in the arithmetic portion. The arithmetic portion updates the forecast error parameter from a first observation signal supplied from the frame memory and a second observation signal supplied from the pixel, in accordance with the regression model, and updates an output parameter by the forecast error parameter in accordance with the regression model. The arithmetic portion corrects the first image signal by the output parameter and generates a second image signal, and the light-emitting element emits light by the second image signal supplied to the transistor included in the pixel.

    Display device and electronic device
    19.
    发明授权
    Display device and electronic device 有权

    公开(公告)号：US11120764B2

    公开(公告)日：2021-09-14

    申请号：US16771052

    申请日：2018-12-04

    Applicant: Semiconductor Energy Laboratory Co., Ltd.

    Inventor： Kei Takahashi ,  Koji Kusunoki ,  Susumu Kawashima ,  Shunpei Yamazaki

    IPC: G09G3/36 ,  G09G3/3225 ,  G09G3/3275 ,  G09G5/393

    Abstract: A display device with a low power consumption a small circuit area is provided. The display device includes an image signal line, an image data storage portion, a correction data storage portion, and a display element; the correction data storage portion is electrically connected to the image signal line, the image signal line is electrically connected to the image data storage portion, and the image data storage portion is electrically connected to the display element. The image signal line stores a first image data with parasitic capacitance, and the image data storage portion stores the first image data. The correction data storage portion stores a correction data, and then generates a second image data having more gradation levels using the correction data in the correction data storage portion after storing the first image data in the image data storage portion.

    Semiconductor device, display device, and electronic device
    20.
    发明授权
    Semiconductor device, display device, and electronic device 有权

    公开(公告)号：US10957720B2

    公开(公告)日：2021-03-23

    申请号：US16760495

    申请日：2018-10-29

    Applicant: Semiconductor Energy Laboratory Co., Ltd.

    Inventor： Kei Takahashi ,  Susumu Kawashima ,  Koji Kusunoki ,  Kazunori Watanabe

    IPC: G09G3/36 ,  H01L27/12 ,  H03M1/68

    Abstract: To provide a display device having a small circuit area and low power consumption. The display device includes a semiconductor device and a D/A converter circuit, and the semiconductor device includes first to third transistors and first and second capacitors. A first terminal of the first transistor is electrically connected to a first terminal of the first capacitor. A first terminal of the second transistor is electrically connected to a gate of the third transistor, a second terminal of the first capacitor, and a first terminal of the second capacitor. A first terminal of the third transistor is electrically connected to a second terminal of the second capacitor. An output terminal of the D/A converter circuit is electrically connected to a second terminal of the first transistor and a second terminal of the second transistor. Supply of a potential to the first terminal of the first capacitor changes (finely adjusts) the potential of the gate of the third transistor to be more precise than a potential that can be output from the D/A converter circuit.

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