公开(公告)号：US20250023555A1

公开(公告)日：2025-01-16

申请号：US18901088

申请日：2024-09-30

Applicant: Hoseo University Academic Cooperation Foundation

Inventor： Byung Seong BAE

IPC: H03K3/037

Abstract: The present invention provides an inverter and a bootstrap inverter with improved output characteristics. The inverter comprises a first and second load transistors, a driving transistor, and a control transistor. The control transistor, when turned on, effectively grounds the source of the first load transistor, ensuring a 0V output. The bootstrap inverter further includes a bootstrap transistor and a capacitor. This configuration solves the problems of output voltage being lower than VDD for logic ‘1’ and not completely 0V for logic ‘0’, achieving ideal output levels.

公开(公告)号：US20240428733A1

公开(公告)日：2024-12-26

申请号：US18621489

申请日：2024-03-29

Applicant: Hoseo University Academic Cooperation Foundation

Inventor： Byung Seong BAE ,  Hyuck Su LEE ,  Seo Jin KANG

IPC: G09G3/3233 ,  G09G3/00

Abstract: The present invention relates to an active-matrix organic light-emitting diode (AMOLED) compensation pixel circuit. More specifically, it concerns an AMOLED compensation pixel circuit capable of compensating for luminance variations caused not only by area changes due to substrate stretching but also by voltage drops resulting from increased resistance as wiring length increases. According to the present invention, a pixel circuit is configured to include an OLED element, three switching transistors, one driving transistor, and two capacitors. This configuration allows the voltage applied to the gate of the driving transistor to change in proportion to the area of the display screen, thereby increasing the current flowing through the OLED. This enables compensation for luminance reduction while also automatically compensating for luminance reduction caused by power supply voltage drops. Furthermore, the present invention can be usefully applied to future display applications such as biomedical, automotive, Internet of Things (IoT), and wearable electronic devices. It can also be implemented in stretchable displays used on the human body or as window curtains. When such displays are partially stretched, causing luminance variations, the invention can compensate for these changes, ensuring uniform luminance even with increased area. Additionally, it can compensate for luminance variations caused by voltage drops due to wiring resistance.