US 12,254,150 B2
Operator control and/or display device
Dietmar Weisser, Tuttlingen (DE)
Assigned to MARQUARDT GMBH, Rietheim-Weilheim (DE)
Appl. No. 17/616,829
Filed by MARQUARDT GMBH, Rietheim-Weilheim (DE)
PCT Filed Oct. 23, 2020, PCT No. PCT/EP2020/079936
§ 371(c)(1), (2) Date Dec. 6, 2021,
PCT Pub. No. WO2021/148158, PCT Pub. Date Jul. 29, 2021.
Claims priority of application No. 10 2020 000 278.1 (DE), filed on Jan. 20, 2020.
Prior Publication US 2022/0350437 A1, Nov. 3, 2022
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01); G09G 5/10 (2006.01)
CPC G06F 3/0416 (2013.01) [G06F 3/0412 (2013.01); G06F 3/0446 (2019.05); G09G 5/10 (2013.01); G09G 2354/00 (2013.01); G09G 2360/145 (2013.01); G09G 2380/10 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A touchscreen operator control and/or display device, for a motor vehicle, comprising:
a display element;
at least one graphics element represented on the display element by visible light radiation; and
a sensor for checking the functionality of the display element, the sensor is adapted to detect the representation of the graphics element by changes in brightness by a photo effect on the display element so that an incorrectly operating graphics element can be detected;
the sensor is a photo diode comprising a coating applied by printing on the display element, the coating material releases electrical charges by light;
the graphics element is the representation of an operating element, wherein the operating element can be acted upon by an object, in particular by a human finger so that a signal, corresponding to the action, in particular of the switching signal type for operating or triggering a function, can be generated, and that the display element is designed as a capacitive touch foil, and the charges released by the photoelectric effect change the capacitance of the touch foil so that a second value is generated for checking the functionality.