公开(公告)号：US20240355287A1

公开(公告)日：2024-10-24

申请号：US18683526

申请日：2021-09-30

Applicant: Sharp Display Technology Corporation

Inventor： Kohhei TANAKA ,  Masahito SANO ,  Kaoru YAMAMOTO ,  Ryo YONEBAYASHI ,  Adnan HEGANOVIC

IPC: G09G3/3233

CPC classification number: G09G3/3233 ,  G09G2300/0819 ,  G09G2300/0842 ,  G09G2300/0861 ,  G09G2310/06 ,  G09G2320/0247 ,  G09G2330/02

Abstract: When a current-driven display device with an internal compensation method operates in a pause driving mode, a non-light emission period according to a light emission duty is provided in both a refresh frame period and a non-refresh frame period, and an on-bias applying period for applying on-bias to a drive transistor in a pixel circuit is provided in both the non-light emission periods. In the non-light emission period in the refresh frame period, an on-bias applying period is provided in a period from when data writing with threshold compensation is performed to when the light emission period starts. Thus, even when the light emission duty is low, the difference in the stress state of the drive transistor between the refresh frame period and the non-refresh frame period is reduced.

公开(公告)号：US20240412690A1

公开(公告)日：2024-12-12

申请号：US18700348

申请日：2021-12-29

Applicant: Sharp Display Technology Corporation

Inventor： Kohhei TANAKA ,  Seiichi UCHIDA

IPC: G09G3/3233 ,  G06F3/041 ,  G09G3/3266 ,  G09G3/3275

Abstract: A pixel circuit with sensing function that can perform sensing operation and display operation in a simultaneous and parallel manner is implemented using a small number of elements. For each pixel circuit (20) there are provided a sensor circuit (22) connected to a control node (NG) and including three or less circuit elements; and a read circuit (24) connected to a second conductive terminal of a drive transistor (T4) and including one read transistor (T9). A sensing process is performed during a period during which a drive current is supplied to an organic EL element (21) depending on a potential at the control node (NG). A sensing result reading process is performed by maintaining the read transistor (T9) in on state during a predetermined period after ending the sensing process.