US 12,260,804 B2
Pixel circuit and display panel
Kuan-Yung Liao, MiaoLi County (TW); and Yun-Li Li, MiaoLi County (TW)
Assigned to PlayNitride Display Co., Ltd., MiaoLi County (TW)
Filed by PlayNitride Display Co., Ltd., MiaoLi County (TW)
Filed on Dec. 20, 2022, as Appl. No. 18/085,537.
Claims priority of application No. 111146719 (TW), filed on Dec. 6, 2022.
Prior Publication US 2024/0185761 A1, Jun. 6, 2024
Int. Cl. G09G 3/20 (2006.01)
CPC G09G 3/2096 (2013.01) [G09G 3/2074 (2013.01); G09G 2300/0842 (2013.01); G09G 2310/0291 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0626 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A pixel circuit, disposed in a display panel, comprising:
a current generator, configured to provide a driving current, wherein the current generator controls the driving current according to a pulse amplitude modulation mechanism;
a switch, coupled in series with the current generator and a light-emitting component, and being turned on or off according to a control signal, wherein the control signal is a pulse width modulation signal;
a set voltage generator, wherein the set voltage generator receives display data, and generates a set voltage according to a gray scale value of the display data;
a time controller, configured to generate the control signal, wherein the time controller receives the set voltage, and adjusts a pulse width of the control signal according to a voltage value of the set voltage generated by the set voltage generator according to the display data,
wherein the time controller comprises:
a triangular wave generating circuit, generating a triangular wave signal according to a clock signal; and
a comparator circuit, coupled to the triangular wave generating circuit, and comparing the triangular wave signal with the set voltage to generate the control signal,
wherein the triangular wave generating circuit comprises:
an operational amplifier, wherein the operational amplifier has a first input terminal to receive the clock signal, a second input terminal to receive a reference voltage, and an output terminal to generate the triangular wave signal; and
a capacitor, coupled between the output terminal of the operational amplifier and the first input terminal of the operational amplifier.