公开(公告)号：US12175941B2

公开(公告)日：2024-12-24

申请号：US18303116

申请日：2023-04-19

Applicant: Wuhan Tianma Micro-Electronics Co., Ltd.

Inventor： Yojiro Matsueda ,  Masamichi Shimoda

IPC: G09G3/3275 ,  G09G3/00

Abstract: A display device determines a gray level for a first pixel based on video data, determines whether the first pixel is in a first deterioration mode or a second deterioration mode following the first deterioration mode based on a driving history of the first pixel, determines a data signal to be supplied to the first pixel based on the gray level and the driving history of the first pixel with reference to first adjustment information for the first deterioration mode in a case of determining that the first pixel is in the first deterioration mode, and determines a data signal to be supplied to the first pixel based on the gray level and the driving history of the first pixel with reference to second adjustment information for the second deterioration mode in a case of determining that the first pixel is in the second deterioration mode.

公开(公告)号：US20230343298A1

公开(公告)日：2023-10-26

申请号：US18303116

申请日：2023-04-19

Applicant: Wuhan Tianma Micro-Electronics Co., Ltd.

Inventor： Yojiro MATSUEDA ,  Masamichi Shimoda

IPC: G09G3/3275 ,  G09G3/00

CPC classification number: G09G3/3275 ,  G09G3/006 ,  G09G2320/045 ,  G09G2310/027 ,  G09G2330/12

Abstract: A display device determines a gray level for a first pixel based on video data, determines whether the first pixel is in a first deterioration mode or a second deterioration mode following the first deterioration mode based on a driving history of the first pixel, determines a data signal to be supplied to the first pixel based on the gray level and the driving history of the first pixel with reference to first adjustment information for the first deterioration mode in a case of determining that the first pixel is in the first deterioration mode, and determines a data signal to be supplied to the first pixel based on the gray level and the driving history of the first pixel with reference to second adjustment information for the second deterioration mode in a case of determining that the first pixel is in the second deterioration mode.

公开(公告)号：US11322088B2

公开(公告)日：2022-05-03

申请号：US17380134

申请日：2021-07-20

Applicant: WUHAN TIANMA MICRO-ELECTRONICS CO., LTD.

Inventor： Yojiro Matsueda ,  Masamichi Shimoda

IPC: G09G3/3233 ,  G06F3/044

Abstract: A display device includes a display region including display pixels, a control circuit, a first power line pattern, and a second power line pattern. The display region includes a first region and a second region having a lower display pixel density than the first region. The control circuit is configured to supply pixel circuits in the first region with a first power supply potential through the first power line pattern, supply pixel circuits in the second region with a second power supply potential higher than the first power supply potential through the second power line pattern, and supply light-emitting elements of the display pixels in the second region with driving current higher than driving current for the display pixels in the first region for a same grayscale level specified in image data.

公开(公告)号：US12125422B2

公开(公告)日：2024-10-22

申请号：US18303147

申请日：2023-04-19

Applicant: Wuhan Tianma Micro-Electronics Co., Ltd.

Inventor： Yojiro Matsueda ,  Masamichi Shimoda

IPC: G09G3/00 ,  G06F3/044 ,  G09G3/3233 ,  H10K59/12

CPC classification number: G09G3/006 ,  G06F3/0446 ,  G09G3/3233 ,  G06F2203/04111 ,  G09G2300/0413 ,  G09G2300/0452 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2320/029 ,  G09G2320/045 ,  G09G2330/12 ,  H10K59/12

Abstract: A display device includes a deterioration evaluation region including dummy pixels and a display region. A control circuit determines a gray level for a first display pixel and determines whether the first display pixel is in a first deterioration mode or a second deterioration mode based on a driving history of the first display pixel. The control circuit determines, in the first deterioration mode, a data signal to be supplied to the first display pixel based on the gray level and the driving history of the first display pixel. The control circuit determines, in the second deterioration mode, a data signal to be supplied to the first display pixel based on the gray level, the driving history of the first display pixel, and measurement results about a current-voltage characteristic acquired from dummy pixels in the deterioration evaluation region of the same color as the first display pixel.

公开(公告)号：US12106712B2

公开(公告)日：2024-10-01

申请号：US17959933

申请日：2022-10-04

Applicant: Wuhan Tianma Micro-Electronics Co., Ltd.

Inventor： Masamichi Shimoda ,  Genshiro Kawachi

IPC: G09G3/3233

CPC classification number: G09G3/3233 ,  G09G2300/0413 ,  G09G2300/0842 ,  G09G2310/08 ,  G09G2320/029 ,  G09G2320/0295 ,  G09G2320/043 ,  G09G2320/046

Abstract: A display device includes a display pixel circuit including a display light-emitting element, a reference light-emitting element, and a display driving circuit. The display pixel circuit is configured to control light emission of the display light-emitting element based on a data signal in accordance with video data. The reference light-emitting element is precluded from the control in accordance with video data. The display driving circuit is configured to acquire a reference signal indicating a current-voltage characteristic of the reference light-emitting element, acquire a characteristic signal indicating the current-voltage characteristic of the display light-emitting element, and generate a signal indicating a degree of deterioration of the display light-emitting element based on a difference of the characteristic signal from the reference signal.

公开(公告)号：US11455961B2

公开(公告)日：2022-09-27

申请号：US17544503

申请日：2021-12-07

Applicant: Wuhan Tianma Micro-Electronics Co., Ltd.

Inventor： Masamichi Shimoda ,  Jiro Yanase ,  Yojiro Matsueda

IPC: G09G3/3291

Abstract: A driver is configured to maintain a threshold compensation transistor to be ON to write a threshold compensation voltage to a storage capacitor in a threshold compensation period, and write a data signal to the storage capacitor in a data write period after the threshold compensation period. A pulse width of control signal is twice or more as long as the data write period. The driver circuit is configured to turn ON a first transistor with a start edge of a first control signal pulse before the data write period starts, maintain the first transistor to be ON and turn ON a second transistor with a start edge of a second control signal pulse to start the data write period, and turn OFF the first transistor with an end edge of the first control signal pulse to end the data write period.

公开(公告)号：US20210210021A1

公开(公告)日：2021-07-08

申请号：US17192311

申请日：2021-03-04

Applicant: Wuhan Tianma Micro-Electronics Co., Ltd. ,  Tianma Japan, Ltd.

Inventor： Genshiro Kawachi ,  Masamichi Shimoda ,  Yoshihiro Nonaka ,  Jiro Yanase

IPC: G09G3/3275 ,  G09G3/325

Abstract: A display device includes a pixel circuit on a substrate, a data line configured to transmit a data signal for the pixel circuit on the substrate, and a monitoring circuit. The pixel circuit includes a driving transistor configured to control an amount of electric current supplied to a light-emitting element, and a first switching transistor disposed between the light-emitting element and the driving transistor. The first switching transistor switches between supplying and not supplying the light-emitting element with electric current from the driving transistor. The monitoring circuit monitors a signal at a monitoring point located between the driving transistor and the first switching transistor in the pixel circuit.

公开(公告)号：US11798446B2

公开(公告)日：2023-10-24

申请号：US17380120

申请日：2021-07-20

Applicant: WUHAN TIANMA MICRO-ELECTRONICS CO., LTD.

Inventor： Yojiro Matsueda ,  Masamichi Shimoda

IPC: G09G3/3233 ,  G09G3/00 ,  G06F3/044 ,  H10K59/40 ,  H10K59/126

CPC classification number: G09G3/006 ,  G06F3/0446 ,  G09G3/3233 ,  H10K59/126 ,  H10K59/40 ,  G06F2203/04111 ,  G09G2300/0413 ,  G09G2300/0426 ,  G09G2300/0452 ,  G09G2300/0842 ,  G09G2310/08 ,  G09G2320/029 ,  G09G2320/045 ,  G09G2330/12

Abstract: A display device includes a display region including display pixels, dummy pixels disposed outside the display region, light blocking films covering the dummy pixels. The display region includes a first region and a second region having a lower display pixel density than the first region. A control circuit is configured to supply the display pixels in the second region with driving current higher than driving current for the first region for the same grayscale level specified in image data, supply each of the dummy pixels with the same data signal as a data signal for the associated display pixel in the second region, measure deterioration of the light-emitting element of each of the dummy pixels, and adjust data signals for the display pixels in the second region associated with the dummy pixels based on results of the measurement.

公开(公告)号：US11741908B2

公开(公告)日：2023-08-29

申请号：US17695493

申请日：2022-03-15

Applicant: Wuhan Tianma Micro-Electronics Co., Ltd. ,  TIANMA JAPAN, LTD.

Inventor： Genshiro Kawachi ,  Masamichi Shimoda ,  Yoshihiro Nonaka ,  Jiro Yanase

IPC: G09G3/3275 ,  G09G3/325 ,  G09G3/00 ,  G09G3/3233 ,  G09G3/3291

CPC classification number: G09G3/3275 ,  G09G3/325 ,  G09G3/006 ,  G09G3/3233 ,  G09G3/3291 ,  G09G2310/0297 ,  G09G2330/08 ,  G09G2330/12

Abstract: A display device includes a pixel circuit on a substrate, a data line to transmit a data signal for the pixel circuit on the substrate, a power supply line, and an extra voltage supply line different from the power supply line and the data line. The pixel circuit includes a driving transistor to control an amount of electric current supplied to a light-emitting element, a storage capacitor between a gate terminal of the driving transistor and the power supply line, a first switching transistor between the light-emitting element and the driving transistor, a second switching transistor between a source terminal of the driving transistor and the data line, and a third switching transistor between the source terminal of the driving transistor and the extra voltage supply line. The third switching transistor supplies a signal voltage different from the data signal to the driving transistor from the extra voltage supply line.

公开(公告)号：US11495180B2

公开(公告)日：2022-11-08

申请号：US17192311

申请日：2021-03-04

Applicant: Wuhan Tianma Micro-Electronics Co., Ltd. ,  TIANMA JAPAN, LTD.

Inventor： Genshiro Kawachi ,  Masamichi Shimoda ,  Yoshihiro Nonaka ,  Jiro Yanase

IPC: G09G3/3275 ,  G09G3/325 ,  G09G3/00

Abstract: A display device includes a pixel circuit on a substrate, a data line configured to transmit a data signal for the pixel circuit on the substrate, and a monitoring circuit. The pixel circuit includes a driving transistor configured to control an amount of electric current supplied to a light-emitting element, and a first switching transistor disposed between the light-emitting element and the driving transistor. The first switching transistor switches between supplying and not supplying the light-emitting element with electric current from the driving transistor. The monitoring circuit monitors a signal at a monitoring point located between the driving transistor and the first switching transistor in the pixel circuit.