US 12,322,307 B2
Driver and electro-optical device
Kazuaki Tanaka, Chino (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Feb. 15, 2024, as Appl. No. 18/442,227.
Claims priority of application No. 2023-022155 (JP), filed on Feb. 16, 2023.
Prior Publication US 2024/0282226 A1, Aug. 22, 2024
Int. Cl. G09G 3/00 (2006.01); G09G 3/36 (2006.01)
CPC G09G 3/006 (2013.01) [G09G 3/3696 (2013.01); G09G 2300/0426 (2013.01); G09G 2330/12 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A driver comprising:
a first terminal;
a second terminal coupled to the first terminal via a transparent electrode provided at an electro-optical panel;
a first drive circuit coupled to the first terminal and configured to drive the first terminal;
a second drive circuit coupled to the second terminal and configured to drive the second terminal; and
a monitor circuit configured to detect a resistance value of the transparent electrode based on a voltage of only the second terminal among the first and second terminals in a monitoring state, wherein
the monitoring circuit includes:
a comparison circuit including a first input terminal to which a comparison determination voltage is input;
a first switch provided between the second terminal and a second input terminal of the comparison circuit and configured to be turned on in the monitoring state; and
a second switch provided between the second terminal and an output of the second drive circuit and configured to be turned on in the monitoring state, wherein the second switch is turned on when opening between the first terminal and the second terminal is detected, and
the monitoring state is:
a state in which the first terminal is coupled to a first high-potential-side power supply voltage via the first drive circuit and the second terminal is coupled to a second high-potential-side power supply voltage different from the first high-potential-side power supply voltage via the second drive circuit; or
a state in which the first terminal is coupled to one of a high-potential-side power supply voltage and a low-potential-side power supply voltage lower than the high-potential-side power supply voltage via the first drive circuit and the second terminal is coupled to the other of the high-potential-side power supply voltage and the low-potential-side power supply voltage via the second drive circuit.