专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US11189225B1 Pixel circuit with reduced sensitivity to threshold variations of the diode connecting switch 有权
公开(公告)号：US11189225B1
公开(公告)日：2021-11-30
申请号：US17029696
申请日：2020-09-23
申请人： Sharp Kabushiki Kaisha
发明人： Adnan Heganovic , Tong Lu
IPC分类号： G09G3/3233 , G09G3/3266 , G09G3/3291
摘要： A pixel circuit that drives a light-emitting device employs a diode-connection compensation scheme that compensates for threshold variations of the diode connecting switch that diode connects the drive transistor during a threshold compensation phase. The pixel circuit operates to reduce the impact of threshold voltage variations of the diode connecting switch to improve brightness uniformity and picture quality. The pixel circuit includes two compensation capacitors in addition to the storage capacitor for data programming to control the flow and magnitude of a rebalancing current through the diode connecting switch in such a way to cancel excess or deficit of charge caused by threshold voltage variations of the diode connecting switch due to capacitive coupling between the gate node of the switch and the storage capacitor. Therefore, the circuit configuration employs a triple-capacitor structure to significantly improve compensation performance and reliability.

2. 发明申请

US20220230588A1 Fast 1H OLED Pixel Circuit Applying Data to Anode 有权
公开(公告)号：US20220230588A1
公开(公告)日：2022-07-21
申请号：US17154277
申请日：2021-01-21
申请人： Sharp Kabushiki Kaisha
发明人： Adnan Heganovic
IPC分类号： G09G3/3258
摘要： A pixel circuit for a display device minimizes the one horizontal time while maintaining accurate compensation of the threshold voltage of the drive transistor, by extending the compensation phase beyond the data programming phase. The pixel circuit includes a drive transistor configured to control an amount of current to a light-emitting device during an emission phase and a storage capacitor connected between the gate of the drive transistor and the light-emitting device for compensating a threshold voltage of the drive transistor. During a combined data programming and threshold compensation phase, data is programmed and the threshold voltage of the drive transistor is partially compensated, with the data voltage being stored by the internal capacitance of the light-emitting device. The data voltage remains stored during an extended compensation phase in which the drive transistor is further compensated. The pixel circuit includes switch transistors that control the application of supply voltages to the drive transistor, storage capacitor, and light-emitting device during the different phases of operation.

3. 发明授权

US11468842B2 Fast 1H OLED pixel circuit applying data to anode 有权
公开(公告)号：US11468842B2
公开(公告)日：2022-10-11
申请号：US17154277
申请日：2021-01-21
申请人： Sharp Kabushiki Kaisha
发明人： Adnan Heganovic
IPC分类号： G09G3/3258
摘要： A pixel circuit for a display device minimizes the one horizontal time while maintaining accurate compensation of the threshold voltage of the drive transistor, by extending the compensation phase beyond the data programming phase. The pixel circuit includes a drive transistor configured to control an amount of current to a light-emitting device during an emission phase and a storage capacitor connected between the gate of the drive transistor and the light-emitting device for compensating a threshold voltage of the drive transistor. During a combined data programming and threshold compensation phase, data is programmed and the threshold voltage of the drive transistor is partially compensated, with the data voltage being stored by the internal capacitance of the light-emitting device. The data voltage remains stored during an extended compensation phase in which the drive transistor is further compensated. The pixel circuit includes switch transistors that control the application of supply voltages to the drive transistor, storage capacitor, and light-emitting device during the different phases of operation.

4. 发明授权

US11315489B1 Light emitting device driving circuit and related method 有权
公开(公告)号：US11315489B1
公开(公告)日：2022-04-26
申请号：US17233877
申请日：2021-04-19
申请人： SHARP KABUSHIKI KAISHA
发明人： Adnan Heganovic , Kohhei Tanaka , Ryo Yonebayashi , Masahito Sano
IPC分类号： G09G3/3233 , G09G3/3283
摘要： A pixel circuit includes a drive transistor configured to control an amount of current to a light emitting device during an emission phase depending upon a voltage applied to a control terminal of the drive transistor, the drive transistor having a first terminal and a second terminal. During a first phase, an anode of the light emitting device is set to a reference voltage and the first terminal of the drive transistor is set to a fixed data voltage such that the drive transistor is stressed with a fixed source-to-gate voltage to prevent a drift of a threshold voltage in the drive transistor thereby preventing a drift in screen brightness. During a second phase, the anode of the light emitting device is set to the reference voltage and the first terminal of the drive transistor is set to a voltage of the first power supply.

5. 发明授权

US11069292B1 TFT pixel threshold voltage compensation circuit using a variable capacitor 有权
公开(公告)号：US11069292B1
公开(公告)日：2021-07-20
申请号：US16856447
申请日：2020-04-23
申请人： Sharp Kabushiki Kaisha
发明人： Adnan Heganovic , Tong Lu , Michael James Brownlow
IPC分类号： G09G3/325 , G09G3/3283
摘要： A pixel circuit for driving a light-emitting device for a display device is operable in an initialization phase, a compensation phase, a data programming phase, and an emission phase. The one horizontal time is minimized while maintaining accurate compensation of the threshold voltage of the drive transistor, and the pixel circuit further employs a varactor to compensate for variations in the threshold voltage of the drive transistor and for parasitic capacitances that arise within the pixel circuit. A capacitance of the varactor varies with a voltage at a node N1 constituting an electrical connection during the compensation phase of the drive transistor, the light-emitting device, a storage capacitor, and the varactor. The use of the capacitance variation of the varactor accounts for a variation in the threshold voltage of the drive transistor and for parasitic capacitances in the pixel circuit. The varactor may be implemented as a thin film transistor that operates as a variable capacitor.

你已经成功收藏专利！

检索式保存成功!

IPRDB