US 11,720,214 B2
Touch panel, display device, display system, and touch method with photosensitive layer for in-the-air input detection
Guangyun Tong, Beijing (CN); Yu Zhang, Beijing (CN); Zhuolong Li, Beijing (CN); Liang Bo, Beijing (CN); and Xuefei Qin, Beijing (CN)
Assigned to Beijing BOE Display Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Filed by Beijing BOE Display Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Filed on Jan. 18, 2022, as Appl. No. 17/578,284.
Claims priority of application No. 202110203706.8 (CN), filed on Feb. 23, 2021.
Prior Publication US 2022/0269373 A1, Aug. 25, 2022
Int. Cl. G06F 3/044 (2006.01); G06F 3/041 (2006.01); G06F 3/0346 (2013.01); G06V 40/13 (2022.01)
CPC G06F 3/0445 (2019.05) [G06F 3/0346 (2013.01); G06F 3/0412 (2013.01); G06F 3/0446 (2019.05); G06F 3/04164 (2019.05); G06F 2203/04106 (2013.01); G06F 2203/04114 (2019.05); G06V 40/1318 (2022.01)] 5 Claims
OG exemplary drawing
 
1. A display device, comprising: a display panel and a touch panel disposed on a light-emitting side of the display panel, wherein the touch panel comprises:
a first electrode layer, a photosensitive layer, and a second electrode layer that are laminated, the photosensitive layer being insulated from the first electrode layer and the second electrode layer, and the first electrode layer, the photosensitive layer, and the second electrode layer forming a plurality of touch units arranged in an array;
wherein the photosensitive layer is configured to generate a dielectric constant change at a position under irradiation by light from a line light source,
wherein the touch panel further comprises: a plurality of touch drive lines connected to the plurality of touch units, and a plurality of touch sensing lines connected to the plurality of touch units; and
the display device further comprises a controller,
wherein the controller is configured to:
load drive signals to the plurality of touch units via the plurality of touch drive lines;
receive sensing signals output by the plurality of touch units via the plurality of touch sensing lines; and
determine a first position under irradiation by the line light source in the touch panel based on the received sensing signals,
wherein the controller is further configured to:
determine current capacitances of the touch units in the touch panel based on the received sensing signals;
determine capacitance change values of the touch units based on the current capacitances of the touch units and reference capacitances of the touch units; and
determine the first position under irradiation by the line light source in the touch panel based on the capacitance change values of the touch units,
wherein the controller is further configured to:
determine a second position under pressing in the touch panel based on the capacitance change values of the touch units,
wherein the controller is further configured to:
determine a difference value between the reference capacitance of each of the touch units and the current capacitance of the touch unit as the capacitance change value of the touch unit;
determine a position of a first touch unit in the touch panel as the first position in the case that the capacitance change value of the first touch unit is a negative value and the capacitance change value of the first touch unit is less than a first threshold; and
determine a position of a second touch unit in the touch panel as the second position in the case that the capacitance change value of the second touch unit is a positive value and the capacitance change value of the second touch unit is greater than a second threshold;
wherein each of the first touch unit and the second touch unit is any one of the plurality of touch units, the first threshold is a negative value, and the second threshold is a positive value.