US 12,218,661 B1
Driver circuit of display device
Wei-Te Lee, Taipei (TW)
Assigned to INTEGRATED SOLUTIONS TECHNOLOGY INC., Taipei (TW)
Filed by INTEGRATED SOLUTIONS TECHNOLOGY INC., Taipei (TW)
Filed on Oct. 12, 2023, as Appl. No. 18/485,327.
Claims priority of application No. 112128976 (TW), filed on Aug. 2, 2023.
Int. Cl. H03K 17/687 (2006.01); G09G 3/20 (2006.01); G09G 3/34 (2006.01)
CPC H03K 17/6871 (2013.01) [G09G 3/20 (2013.01); G09G 3/2011 (2013.01); G09G 3/344 (2013.01); G09G 2310/0275 (2013.01); G09G 2310/06 (2013.01); G09G 2310/068 (2013.01); H03K 2217/0063 (2013.01); H03K 2217/0072 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A driver circuit of a display device, comprising:
a high-side transistor, wherein a first terminal of the high-side transistor is coupled to a high-side input voltage;
a high-side voltage drop suppressor circuit, wherein a first terminal of the high-side voltage drop suppressor circuit is connected to a second terminal of the high-side transistor, and a second terminal of the high-side voltage drop suppressor circuit is connected to an output terminal of the driver circuit of the display device;
a low-side voltage drop suppressor circuit including at least one transistor as at least one low-side suppression transistor;
a low-side transistor, wherein a first terminal of the low-side transistor is coupled to a low-side input voltage, and a second terminal of the low-side transistor is connected to a first terminal of the low-side voltage drop suppressor circuit;
a control circuit connected to a control terminal of the high-side transistor, a control terminal of the high-side voltage drop suppressor circuit, a control terminal of the low-side voltage drop suppressor circuit, and a control terminal of the low-side transistor; and
a low-side voltage modulating circuit, wherein a first terminal of the low-side voltage modulating circuit is connected to a low-side voltage source, a second terminal of the low-side voltage modulating circuit is connected to a low-side node between the second terminal of the low-side transistor and a first terminal of the at least one low-side suppression transistor, a second terminal of the at least one low-side suppression transistor is connected to the output terminal of the driver circuit of the display device, and a control terminal of the at least one low-side suppression transistor is connected to the control circuit;
wherein, when the output terminal of the driver circuit of the display device supplies power generated from the high-side input voltage, the control circuit turns on the high-side transistor and the high-side voltage drop suppressor circuit, such that a voltage drop between the high-side input voltage and the output terminal of the driver circuit of the display device are divided into two voltages that are withstood respectively by the high-side transistor and the high-side voltage drop suppressor circuit;
wherein, when the output terminal of the driver circuit of the display device supplies power generated from the low-side input voltage, the control circuit turns on the low-side transistor and the low-side voltage drop suppressor circuit, such that a voltage drop between the low-side input voltage and the output terminal of the driver circuit of the display device are divided into two voltages that are withstood respectively by the low-side transistor and the low-side voltage drop suppressor circuit;
wherein, when the output terminal of the driver circuit of the display device supplies power generated from the high-side input voltage, the control circuit controls the low-side voltage modulating circuit to use a voltage supplied by the low-side voltage source to increase a voltage of the low-side node between the second terminal of the low-side transistor and the first terminal of the at least one low-side suppression transistor.