US 11,720,208 B2
RGB LED touch panel and drive sense circuit
Daniel Keith Van Ostrand, Leander, TX (US); Gerald Dale Morrison, Redmond, WA (US); Richard Stuart Seger, Jr., Belton, TX (US); and Timothy W. Markison, Mesa, AZ (US)
Assigned to SigmaSense, LLC., Wilmington, DE (US)
Filed by SigmaSense, LLC., Wilmington, DE (US)
Filed on Mar. 4, 2022, as Appl. No. 17/653,602.
Application 17/653,602 is a continuation of application No. 17/223,613, filed on Apr. 6, 2021, granted, now 11,269,458.
Application 17/223,613 is a continuation of application No. 16/403,200, filed on May 3, 2019, granted, now 11,029,782, issued on Jun. 8, 2021.
Prior Publication US 2022/0187933 A1, Jun. 16, 2022
Int. Cl. G06F 3/042 (2006.01); G09G 3/3225 (2016.01); G06F 3/0488 (2022.01)
CPC G06F 3/042 (2013.01) [G06F 3/0488 (2013.01); G09G 3/3225 (2013.01); G09G 2310/066 (2013.01); G09G 2320/0606 (2013.01); G09G 2360/144 (2013.01); G09G 2370/18 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A touch display apparatus comprising:
a plurality of light emitting diodes (LEDs), wherein a light emitting diode (LED) of the plurality of LEDs is configured to emit light having a wavelength that is different than another wavelength of another LED of the plurality of LEDs;
a plurality of light blocking spacers, wherein a light blocking spacer of the plurality of light blocking spacers is implemented adjacent to the LED of the plurality of LEDs and is configured to block horizontal light detection from another LED of the plurality of LEDs;
a plurality of LED touch sensors, wherein an LED touch sensor of the plurality of LED touch sensors is operably coupled to the LED of the plurality of LEDs and includes:
a data drive input circuit, wherein when enabled, the data drive input circuit is configured to generate a transmit-receive signal that is based on a digital input, wherein the transmit-receive signal is configured to facilitate operation of the LED touch sensor in accordance with a transmit mode and a receive mode based on different respective components of the transmit-receive signal;
a drive-sense circuit (DSC) operably coupled to the data drive input circuit, wherein when enabled, the DSC is configured to operate in accordance with the transmit mode and the receive mode based on the different respective components of the transmit-receive signal including to:
forward bias the LED to facilitate the LED emitting light in accordance with a light intensity value based on the transmit mode; and
reverse bias the LED to facilitate the LED generating a current based on the LED receiving light based on the receive mode and to generate a digital representation of the current; and
a data output circuit operably coupled to DSC, wherein when enabled, the data output circuit is configured to generate a digital representation of light intensity based on the digital representation of the current that is generated by the DSC.