公开(公告)号：US10263059B2

公开(公告)日：2019-04-16

申请号：US15907334

申请日：2018-02-28

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Jun Koyama ,  Tatsuya Arao ,  Munehiro Azami

IPC: H01L27/32 ,  H01L27/12 ,  H01L29/786

Abstract: A light emitting device is provided which can prevent a change in gate voltage due to leakage or other causes and at the same time can prevent the aperture ratio from lowering. A capacitor storage is formed from a connection wiring line, an insulating film, and a capacitance wiring line. The connection wiring line is formed over a gate electrode and an active layer of a TFT of a pixel, and is connected to the active layer. The insulating film is formed on the connection wiring line. The capacitance wiring line is formed on the insulating film This structure enables the capacitor storage to overlap the TFT, thereby increasing the capacity of the capacitor storage while keeping the aperture ratio from lowering. Accordingly, a change in gate voltage due to leakage or other causes can be avoided to prevent a change in luminance of an OLED and flickering of screen in analog driving.

公开(公告)号：US10242629B2

公开(公告)日：2019-03-26

申请号：US15249640

申请日：2016-08-29

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Jun Koyama ,  Yoshiharu Hirakata

IPC: G09G3/36 ,  G09G3/34 ,  G02F1/1335 ,  G02F1/1337 ,  G02F1/1343 ,  G02F1/1368 ,  G09G3/20 ,  G02F1/1333 ,  G02F1/1334 ,  G02F1/1362

Abstract: An object is to provide a liquid crystal display device which can recognize image display even when the liquid crystal display device is used in a dim environment. In one pixel, a pixel electrode including both of a region where incident light through a liquid crystal layer is reflected and a transmissive region is provided, and image display can be performed in both modes: the reflective mode where external light is used as an illumination light source; and the transmissive mode where the backlight is used as an illumination light source. When there is external light with insufficient brightness, that is, in a dim environment, the backlight emits weak light and an image is displayed in the reflective mode, whereby image display can be performed.

公开(公告)号：US10216055B2

公开(公告)日：2019-02-26

申请号：US15792841

申请日：2017-10-25

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Jun Koyama

IPC: G02F1/1362 ,  G09G3/36

Abstract: A liquid crystal display device with a novel structure is provided. Each pixel includes a first circuit for holding a high level (or low level) potential and a second circuit for holding a low level (or high level) potential. A semiconductor layer of a transistor included in each of the first and second circuits is an oxide semiconductor layer. The second circuit is reset when being supplied with the high level potential. Whether the high level potential held in the second circuit changes is controlled by a data voltage supplied to the first circuit. The potential held in the first circuit and the potential held in the second circuit are respectively supplied to a first transistor and a second transistor.

公开(公告)号：US10211344B2

公开(公告)日：2019-02-19

申请号：US13845424

申请日：2013-03-18

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Jun Koyama ,  Masashi Tsubuku ,  Kosei Noda

IPC: H01L29/786 ,  H01L27/12 ,  H01L21/66

CPC classification number: H01L29/7869 ,  H01L22/34 ,  H01L27/0207 ,  H01L27/1225 ,  H01L29/78696 ,  H01L2924/0002 ,  H01L2924/00

Abstract: A logic circuit includes a thin film transistor having a channel formation region formed using an oxide semiconductor, and a capacitor having terminals one of which is brought into a floating state by turning off the thin film transistor. The oxide semiconductor has a hydrogen concentration of 5×1019 (atoms/cm3) or less and thus substantially serves as an insulator in a state where an electric field is not generated. Therefore, off-state current of a thin film transistor can be reduced, leading to suppressing the leakage of electric charge stored in a capacitor, through the thin film transistor. Accordingly, a malfunction of the logic circuit can be prevented. Further, the excessive amount of current which flows in the logic circuit can be reduced through the reduction of off-state current of the thin film transistor, resulting in low power consumption of the logic circuit.

公开(公告)号：US10181481B2

公开(公告)日：2019-01-15

申请号：US15088191

申请日：2016-04-01

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Jun Koyama ,  Shunpei Yamazaki

IPC: G02F1/1345 ,  H01L27/12 ,  G09G3/20 ,  G02F1/1368 ,  H01L27/32 ,  H01L29/786

Abstract: A display device includes a driver circuit including a logic circuit including a first transistor which is a depletion type transistor and a second transistor which is an enhancement type transistor; a signal line which is electrically connected to the driver circuit; a pixel portion including a pixel whose display state is controlled by input of a signal including image data from the driver circuit through the signal line; a reference voltage line to which reference voltage is applied; and a third transistor which is a depletion type transistor and controls electrical connection between the signal line and the reference voltage line. The first to the third transistors each include an oxide semiconductor layer including a channel formation region.

公开(公告)号：US10157584B2

公开(公告)日：2018-12-18

申请号：US16039515

申请日：2018-07-19

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Jun Koyama

IPC: G09G3/36

Abstract: An object is to reduce power consumption of a display device and to suppress deterioration of display quality. As a transistor provided for each pixel, a transistor including an oxide semiconductor layer is used. Note that off-state current of the transistor can be decreased when the oxide semiconductor layer is highly purified. Therefore, variation in the value of a data signal due to the off-state current of the transistor can be suppressed. That is, display deterioration (change) which occurs when writing frequency of the data signal to the pixel including the transistor is reduced (when a break period is lengthened) can be suppressed. In addition, flickers in display which generates when the frequency of an alternating-current driving signal supplied to a signal line in the break period is reduced can be suppressed.

公开(公告)号：US10083651B2

公开(公告)日：2018-09-25

申请号：US14881500

申请日：2015-10-13

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Jun Koyama ,  Hiroyuki Miyake

IPC: G09G3/32 ,  G09G3/3208 ,  H01L27/12 ,  G09G3/3233 ,  H01L29/786 ,  G09G3/20 ,  H01L27/32

CPC classification number: G09G3/3208 ,  G09G3/2003 ,  G09G3/3233 ,  G09G2330/021 ,  H01L27/1225 ,  H01L27/3262 ,  H01L27/3276 ,  H01L29/78609 ,  H01L29/7869 ,  H01L29/78693 ,  H01L29/78696

Abstract: Objects are to provide a display device the power consumption of which is reduced, to provide a self-luminous display device the power consumption of which is reduced and which is capable of long-term use in a dark place. A circuit is formed using a thin film transistor in which a highly-purified oxide semiconductor is used and a pixel can keep a certain state (a state in which a video signal has been written). As a result, even in the case of displaying a still image, stable operation is easily performed. In addition, an operation interval of a driver circuit can be extended, which results in a reduction in power consumption of a display device. Moreover, a light-storing material is used in a pixel portion of a self-luminous display device to store light, whereby the display device can be used in a dark place for a long time.

公开(公告)号：US20180254311A1

公开(公告)日：2018-09-06

申请号：US15907334

申请日：2018-02-28

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Jun Koyama ,  Tatsuya Arao ,  Munehiro Azami

IPC: H01L27/32 ,  H01L27/12 ,  H01L29/786

CPC classification number: H01L27/3265 ,  H01L27/124 ,  H01L27/1255 ,  H01L27/3246 ,  H01L27/3258 ,  H01L27/3262 ,  H01L27/3276 ,  H01L29/78633

Abstract: A light emitting device is provided which can prevent a change in gate voltage due to leakage or other causes and at the same time can prevent the aperture ratio from lowering. A capacitor storage is formed from a connection wiring line, an insulating film, and a capacitance wiring line. The connection wiring line is formed over a gate electrode and an active layer of a TFT of a pixel, and is connected to the active layer. The insulating film is formed on the connection wiring line. The capacitance wiring line is formed on the insulating film This structure enables the capacitor storage to overlap the TFT, thereby increasing the capacity of the capacitor storage while keeping the aperture ratio from lowering. Accordingly, a change in gate voltage due to leakage or other causes can be avoided to prevent a change in luminance of an OLED and flickering of screen in analog driving.

公开(公告)号：US10068953B2

公开(公告)日：2018-09-04

申请号：US15860725

申请日：2018-01-03

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Shunpei Yamazaki ,  Mai Akiba ,  Jun Koyama

IPC: H01L29/08 ,  H01L27/32 ,  G09G3/3225 ,  H01L27/12 ,  H01L51/52 ,  G09G3/3233 ,  G09G3/3258 ,  H01L27/15 ,  G09G3/3283 ,  G09G3/3241 ,  H01L33/32 ,  H01L27/13 ,  H01L29/66 ,  H01L33/20 ,  H01L29/49 ,  H01L51/00 ,  G09G3/325 ,  G09G3/22 ,  G09G3/20

Abstract: By controlling the luminance of light emitting element not by means of a voltage to be impressed to the TFT but by means of controlling a current that flows to the TFT in a signal line drive circuit, the current that flows to the light emitting element is held to a desired value without depending on the characteristics of the TFT. Further, a voltage of inverted bias is impressed to the light emitting element every predetermined period. Since a multiplier effect is given by the two configurations described above, it is possible to prevent the luminance from deteriorating due to a deterioration of the organic luminescent layer, and further, it is possible to maintain the current that flows to the light emitting element to a desired value without depending on the characteristics of the TFT.

公开(公告)号：US10051255B2

公开(公告)日：2018-08-14

申请号：US15091622

申请日：2016-04-06

Applicant: Semiconductor Energy Laboratory Co., Ltd.

Inventor： Jun Koyama ,  Mai Akiba

IPC: G06K9/00 ,  H04N13/00 ,  H04N13/04 ,  G06T19/20 ,  G09G3/00 ,  G09G5/00

Abstract: An image processing method to obtain a high sense of depth or high stereoscopic effect for an image and a display device utilizing the method are provided. Image data of an image is separated into image data of a plurality of objects and a background. A feature amount is obtained from the image data of each object, so that the objects are identified. The relative distance between viewer's eye and any of the objects is determined by the data of the sizes of the objects in the image and the sizes of the objects stored in the database. The image data of each object is processed so that an object with a shorter relative distance is enlarged. The image data of each object after image processing is combined with the image data of the background, so that a sense of depth or stereoscopic effect of an image is increased.