公开(公告)号：US20210174757A1

公开(公告)日：2021-06-10

申请号：US16771246

申请日：2018-12-11

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Kouhei TOYOTAKA ,  Kei TAKAHASHI ,  Koji KUSUNOKI ,  Kazunori WATANABE ,  Susumu KAWASHIMA

IPC: G09G3/36 ,  G06F3/041

Abstract: A novel display panel that is highly convenient or reliable is provided. A pixel circuit includes a first switch, a node, a capacitor, and a second switch. The first switch includes a first terminal to which a first signal is supplied and a second terminal electrically connected to the node. The capacitor includes a first terminal electrically connected to the node and a second terminal electrically connected to the second switch. The second switch includes a first terminal to which a second signal is supplied and a second terminal electrically connected to the second terminal of the capacitor. In addition, the second switch has a function of changing from a non-conducting state to a conducting state when the first switch is in a non-conducting state and a function of changing from a conducting state to a non-conducting state when the first switch is in a non-conducting state. The display element performs display on the basis of a potential of the node.

公开(公告)号：US20210110783A1

公开(公告)日：2021-04-15

申请号：US16971137

申请日：2019-02-14

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Susumu KAWASHIMA ,  Kouhei TOYOTAKA ,  Koji KUSUNOKI ,  Kei TAKAHASHI ,  Kentaro HAYASHI

IPC: G09G3/36 ,  G09G3/34

Abstract: A display device operating at high speed is provided.
The display device includes a pixel provided with a first memory circuit, a second memory circuit, and a display unit, in which the first memory circuit and the second memory circuit are electrically connected to one electrode of the display unit. The operation of the display device includes a first period of writing first image data to the first memory circuit and writing second image data to the second memory circuit, a second period of supplying a first potential to the first memory circuit, a third period of displaying a first image corresponding to the first image data, a fourth period of setting a potential of the one electrode of the display unit to a second potential, a fifth period of supplying the first potential to the second memory circuit, and a sixth period of displaying a second image corresponding to the second image data.

公开(公告)号：US20210098300A1

公开(公告)日：2021-04-01

申请号：US16632673

申请日：2018-08-20

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Koji KUSUNOKI ,  Kazunori WATANABE ,  Susumu KAWASHIMA

IPC: H01L21/8232 ,  H01L27/088 ,  H04N5/232

Abstract: A novel image processing method is provided.
In a display device in which a video signal is individually supplied to a screen divided into two, the entire screen is subjected to up-conversion processing after being divided, and another up-conversion processing is performed for a boundary portion of the screen divided into two. The divided up-conversion processing for the entire screen and the up-conversion processing for the boundary portion are performed in parallel with the use of a plurality of arithmetic units. The divided up-conversion processing for the entire screen and the up-conversion processing for the boundary portion can be performed using different algorithms.

公开(公告)号：US20210097951A1

公开(公告)日：2021-04-01

申请号：US16970779

申请日：2019-02-13

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Kouhei TOYOTAKA ,  Kazunori WATANABE ,  Susumu KAWASHIMA

IPC: G09G3/36

Abstract: A display apparatus that operates at high speed is provided. The display apparatus includes a display portion provided with a pixel, and the display portion has a function of displaying a first-color image and a second-color image. A first period in which first image data and first data are written to the pixel, a second period in which the first-color image corresponding to the first image data is displayed on the display portion, a third period in which second image data is generated in the pixel on the basis of the first image data and the first data, and a fourth period in which the second-color image corresponding to the second image data is displayed on the display portion are included.

公开(公告)号：US20210096409A1

公开(公告)日：2021-04-01

申请号：US16956623

申请日：2018-12-25

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kouhei TOYOTAKA ,  Kazunori WATANABE ,  Susumu KAWASHIMA ,  Kei TAKAHASHI ,  Koji KUSUNOKI ,  Masataka NAKADA ,  Ami SATO

IPC: G02F1/1368 ,  G02F1/1362

Abstract: A liquid crystal display device with a high aperture ratio is provided. The display device includes a transistor, a first insulating layer, a second insulating layer, a third insulating layer, a first conductive layer, a pixel electrode, a common electrode, and a liquid crystal layer in a pixel. The first insulating layer is positioned over a channel formation region of the transistor. The first conductive layer is positioned over the first insulating layer. The second insulating layer is positioned over the transistor, the first insulating layer, and the first conductive layer. The pixel electrode is positioned over the second insulating layer, the third insulating layer is positioned over the pixel electrode, the common electrode is positioned over the third insulating layer, and the liquid crystal layer is positioned over the common electrode. The common electrode includes a region overlapping with the first conductive layer with the pixel electrode positioned therebetween. The pixel includes a first connection portion where the pixel electrode is electrically connected to the transistor and a second connection portion where the first conductive layer is electrically connected to the common electrode. The first conductive layer, the pixel electrode, and the common electrode each have a function of transmitting visible light.

公开(公告)号：US20210066442A1

公开(公告)日：2021-03-04

申请号：US17003655

申请日：2020-08-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Kazunori WATANABE ,  Susumu KAWASHIMA ,  Koji KUSUNOKI

IPC: H01L27/32 ,  G09G3/3233 ,  G09G3/20 ,  G09G3/3275

Abstract: A display device that can easily achieve higher definition is provided. The display device includes a pixel, a first wiring, and a second wiring. The pixel includes first to fourth transistors, a first capacitor, and a light-emitting element. One of a source and a drain of the first transistor is connected to the first wiring, and the other of the source and the drain of the first transistor is connected to a gate of the second transistor and to the first capacitor. The light-emitting element is connected to one of a source and a drain of the second transistor. The first wiring is supplied with a first data potential. The second wiring is supplied with a second data potential and a reset potential in different periods. The third transistor supplies the second data potential to the first capacitor. The fourth transistor supplies the reset potential to the light-emitting element.

公开(公告)号：US20190378859A1

公开(公告)日：2019-12-12

申请号：US16426293

申请日：2019-05-30

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Susumu KAWASHIMA ,  Naoto KUSUMOTO

IPC: H01L27/12 ,  H01L27/32 ,  H01L27/15

Abstract: A display device capable of improving image quality with low power consumption is provided. A storage node is provided in each pixel and a first signal can be held in the storage node. A second signal is added to the first signal by capacitive coupling to generate a third signal. A display element operates in response to the third signal. Thus, regardless of the output voltage of a driver that supplies data, a high voltage can be supplied to the display element. Consequently, even a display element that requires a relatively high voltage for operation can operate with low power consumption.

公开(公告)号：US20250095602A1

公开(公告)日：2025-03-20

申请号：US18897142

申请日：2024-09-26

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Susumu KAWASHIMA ,  Naoto KUSUMOTO

IPC: G09G3/36 ,  G02F1/1362 ,  G02F1/1368 ,  G09G3/3225 ,  G09G3/3266 ,  G09G3/3275 ,  G09G3/34 ,  H01L27/12 ,  H01L29/24 ,  H01L29/786 ,  H04N23/57 ,  H10K59/121 ,  H10K59/131 ,  H10K59/65

Abstract: A display device capable of improving image quality is provided. The display device includes a first circuit, a pixel, and a wiring. The first circuit has a function of supplying data to the wiring and a function of making the wiring floating to hold the data. The pixel has a function of taking in the data twice from the wiring and performing addition. The pixel can perform the first writing of the data in a period during which the data is supplied to the wiring, and can perform the second writing of the data in a period during which the data is held in the wiring. Therefore, by one time of data charging to a source line, a data potential larger than or equal to an output voltage of a source driver can be supplied to a display element.

公开(公告)号：US20250076716A1

公开(公告)日：2025-03-06

申请号：US18951923

申请日：2024-11-19

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Susumu KAWASHIMA ,  Naoto KUSUMOTO

IPC: G02F1/1362 ,  G02F1/1368 ,  H01L27/12

Abstract: A display apparatus having an excellent boosting function is provided. The display apparatus is provided with a pixel having a function of adding data (a boosting function). A capacitor for boosting voltage is provided in the pixel, and data is added by capacitive coupling to be supplied to a display device. The capacitor for boosting voltage and a capacitor for retaining data are placed on top of each other, whereby the capacitance value of the capacitor for boosting voltage can be increased. Thus, the pixel can have an excellent boosting function, without significantly losing the aperture ratio or definition.

公开(公告)号：US20250061833A1

公开(公告)日：2025-02-20

申请号：US18718315

申请日：2022-12-05

Applicant: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.

Inventor： Susumu KAWASHIMA ,  Koji KUSUNOKI ,  Tomoaki ATSUMI ,  Naoto KUSUMOTO

IPC: G09G3/20 ,  G09G3/32 ,  H01L25/16 ,  H01L27/12

Abstract: A display device whose change in chromaticity is small and grayscale controllability is high is provided. The display device can turn on and turn off a light-emitting device by PAM and PWM control (a pulse width control involving changes in amplitude). The display device writes the same input signal (data potential) to a first node and a second node to turn on the light-emitting device in accordance with a potential of the first node and generate a pulse signal in accordance with a potential of the second node. The potential of the first node can be reset in accordance with the generated pulse signal. Therefore, the light-emitting device can emit light for a desired period with a desired emission intensity.