US 12,228,813 B2
Optical sensor-equipped liquid crystal display device
Hiroyuki Abe, Tokyo (JP); Akihiko Saitoh, Tokyo (JP); and Teppei Yamada, Tokyo (JP)
Assigned to JAPAN DISPLAY INC., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on Nov. 13, 2023, as Appl. No. 18/507,638.
Claims priority of application No. 2022-181963 (JP), filed on Nov. 14, 2022.
Prior Publication US 2024/0160059 A1, May 16, 2024
Int. Cl. G02F 1/1333 (2006.01); G02F 1/133 (2006.01); G06V 40/13 (2022.01); G09G 3/36 (2006.01)
CPC G02F 1/13338 (2013.01) [G02F 1/13306 (2013.01); G06V 40/1318 (2022.01); G09G 3/3677 (2013.01); G09G 2310/0286 (2013.01); G09G 2310/08 (2013.01); G09G 2354/00 (2013.01)] 3 Claims
OG exemplary drawing
 
1. An optical sensor-equipped liquid crystal display device, comprising:
a display panel comprising a first substrate, a second substrate opposed to the first substrate, and
a liquid crystal layer located between the first substrate and the second substrate; and
a driver IC, wherein
the display panel comprises:
a display area including a plurality of pixels arrayed in a matrix;
a surrounding area surrounding the display area;
a first peripheral circuit and a second peripheral circuit connected to the driver IC and provided in areas located on left and right sides of the display area, of the surrounding area; and
an optical sensor provided in at least one of the plurality of pixels, and comprising a photoelectric conversion element that outputs a detection signal in response to light made incident from the liquid crystal layer side,
each of the first peripheral circuit and the second peripheral circuit comprises:
a shift register; and
a gate switch group connected to the shift register and including a first gate switch and a second gate switch,
each of the first gate switches is connected to a first switching element for driving the pixel via a scanning line,
the second gate switch included in the first peripheral circuit is connected to a second switching element included in a sensor circuit for driving the optical sensor via a first scanning line for sensor, and
the second gate switch included in the second peripheral circuit is connected to a third switching element included in a sensor circuit for driving the optical sensor via a second scanning line for sensor, wherein
each of the first gate switches is turned on in a first period for displaying an image in the display area and supplies a scanning signal for display to the first switching element,
the second gate switch included in the first peripheral circuit is turned on in a second period for resetting a potential of the optical sensor and supplies a first scanning signal for sensor to the second switching element, and
the second gate switch included in the second peripheral circuit is turned on in the second period and a third period for reading the detection signal from the optical sensor and supplies a second scanning signal for sensor to the third switching element.