US 12,482,409 B2
Passive display apparatus with light-emitting elements
Hsien-Chun Wang, Hsinchu (TW); Hsin-Chun Huang, Hsinchu (TW); Hsiao-Wei Cheng, Hsinchu (TW); and Yang-En Wu, Hsinchu (TW)
Assigned to AUO Corporation, Hsinchu (TW)
Filed by AUO Corporation, Hsinchu (TW)
Filed on Jun. 11, 2024, as Appl. No. 18/740,487.
Claims priority of application No. 112135279 (TW), filed on Sep. 15, 2023.
Prior Publication US 2025/0095552 A1, Mar. 20, 2025
Int. Cl. G09G 3/36 (2006.01); G09G 3/32 (2016.01)
CPC G09G 3/32 (2013.01) [G09G 2310/0267 (2013.01); G09G 2310/0286 (2013.01); G09G 2310/08 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A passive display apparatus, comprising:
a plurality of light-emitting elements, arranged in an array;
a scanning circuit, coupled to the plurality of light-emitting elements and having a plurality of scan shift registers to generate a plurality of scan signals enabled sequentially;
a plurality of scanning switches, receiving the plurality of scan signals and a first operating voltage to provide the first operating voltage to the plurality of light-emitting elements row by row; and
a current control circuit, coupled to the plurality of light-emitting elements and receiving a plurality of pixel voltages to provide a plurality of light-emitting currents to the plurality of light-emitting elements, wherein the plurality of light-emitting elements emit light based on the received light-emitting currents,
wherein the current control circuit comprises:
a plurality of current generating blocks, individually comprising:
a first transistor, having a first terminal receiving a second operating voltage, a control terminal, and a second terminal providing a corresponding light-emitting current;
a first capacitor, coupled between a corresponding pixel voltage and the control terminal of the first transistor;
a second transistor, having a first terminal, a control terminal receiving a multiplex control signal, and a second terminal coupled to the second terminal of the first transistor;
a third transistor, having a first terminal coupled to the control terminal of the first transistor, a control terminal receiving the multiplex control signal, and a second terminal coupled to the first terminal of the second transistor;
a fourth transistor, having a first terminal coupled to the first terminal of the second transistor, a control terminal receiving a reset signal, and a second terminal receiving the first operating voltage; and
a fifth transistor, having a first terminal receiving a corresponding pixel voltage, a control terminal receiving a light-emitting signal, and a second terminal receiving a reference voltage.