Light emitting diode (LED) touch display circuit
US11029782B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 2019 |
| Grant date | Jun 8, 2021 |
| Priority date | — |
| Expiry date | May 3, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2370/18
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A touch display cell includes a light emitting diode (LED) and an LED touch sensor. The LED touch sensor includes a data drive input circuit operable to generate a transmit-receive signal based on a digital input. The transmit-receive signal includes a transmit signal component and a receive signal component. The LED touch sensor further includes a drive-sense circuit operable to: when the transmit signal component is active, forward bias the LED in accordance with a light intensity value of the transmit signal component such that the LED emits light, and when the receive signal component is active: reverse bias the LED such that the LED generates a current based on received light and generate a digital representation of the current. The LED touch sensor further includes a data output circuit operable to produce a digital representation of light intensity based on the digital representation of the current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.