Object sensing
First Claim
1. A display and user input device, comprising:
- a display substrate comprising a plate and display components formed on the plate; and
an electric field sensing arrangement comprising electric field sensing components,the electric field sensing components comprisingone or more electric field transmission electrodes,one or more electric field reception electrodes, andelectric field sensing circuit components that include;
one or more driver circuits that are configured to drive the one or more electric field transmission electrodes based on an alternating drive signal, andone or more sensing circuits that are configured to sense induced current in the one or more electric field reception electrodes;
wherein one or more of the electric field sensing components are formed on the plate, andat least one sensing circuit of the one or more sensing circuits includes;
a charge accumulator, anda switching circuit that is configured to couple at least one receive electrode of the one or more electric field reception electrodes to the charge accumulator, based on the alternating drive signal.
1 Assignment
0 Petitions
Accused Products
Abstract
An integrated display and object sensing user input device is described. Display components and electric field sensing components are provided on a substrate. Also described is a sensing circuit for detecting current induced in a receiving electrode of an electric field sensing arrangement, wherein the sensing circuit employs two-phase charge accumulation. In operation, two effective circuit parts are selected alternately according to the phase of a voltage concurrently causing electric field emission, such that charge is accumulated in the same charge sense during operation of both effective circuit parts. Plural thin film electric field sensing circuits and electrodes may be arrayed to provide an object sensing array, usable as an input device.
25 Citations
23 Claims
-
1. A display and user input device, comprising:
-
a display substrate comprising a plate and display components formed on the plate; and an electric field sensing arrangement comprising electric field sensing components, the electric field sensing components comprising one or more electric field transmission electrodes, one or more electric field reception electrodes, and electric field sensing circuit components that include; one or more driver circuits that are configured to drive the one or more electric field transmission electrodes based on an alternating drive signal, and one or more sensing circuits that are configured to sense induced current in the one or more electric field reception electrodes; wherein one or more of the electric field sensing components are formed on the plate, and at least one sensing circuit of the one or more sensing circuits includes; a charge accumulator, and a switching circuit that is configured to couple at least one receive electrode of the one or more electric field reception electrodes to the charge accumulator, based on the alternating drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A method of using a sensing circuit to detect induced current in a receiving electrode of an electric field sensing arrangement, the method comprising:
-
delivering current induced at the receiving electrode to a charge accumulator of the sensing circuit; inputting an alternating current drive signal, as supplied to a transmitting electrode of the electric field sensing arrangement, to the sensing circuit; and using the drive signal to vary operation of the sensing circuit when the drive signal is positive compared to when the drive signal is negative; wherein the charge accumulator, the means for delivering induced current, the means for receiving an alternating current drive signal, and the means for using the drive signal to vary operation of the sensing circuit are arranged such that the induced current delivered to the charge accumulator provides a net charge at the charge accumulator, the net charge being a measure of the current induced in the receiving electrode. - View Dependent Claims (13)
-
-
14. A sensing circuit for detecting induced current in a receiving electrode of an electric field sensing arrangement, the sensing circuit comprising:
-
a charge accumulation means; means for delivering current induced at the receiving electrode to the charge accumulation means; means for receiving an alternating current drive signal, as supplied to a transmitting electrode of the electric field sensing arrangement; and means for using the drive signal to vary operation of the sensing circuit when the drive signal is positive compared to when the drive signal is negative; wherein the charge accumulation means, the means for delivering induced current, the means for receiving an alternating current drive signal, and the means for using the drive signal to vary operation of the sensing circuit are arranged such that in operation the induced current is delivered to the charge accumulation means such as to provide a net charge at the charge accumulation means, the net charge being a measure of the current induced in the receiving electrode. - View Dependent Claims (15, 16)
-
-
17. An electric field sensing device, comprising:
-
a plate; a plurality of electric field transmission electrodes formed on the plate; a plurality of electric field reception electrodes formed on the plate; and electric field sensing circuit components comprising; one or more driver circuits that are configured to drive the plurality of electric field transmission electrodes based on an alternating drive signal, and one or more sensing circuits that are configured to sense currents induced in the plurality of electric field reception electrodes, formed from thin film layers on the plate; wherein at least one sensing circuit of the one or more sensing circuits includes; a charge accumulator, and a switching circuit that is configured to couple at least one of the one or more electric field reception electrodes to the charge accumulator, based on the alternating drive signal. - View Dependent Claims (18)
-
-
19. A sensing circuit comprising:
-
a transmit electrode that is driven by an alternating drive signal; a receive electrode that is configured to receive transmitted signals from the transmit electrode; a charge accumulator; and a switching circuit that is configured to couple the receive electrode to the charge accumulator, based on the alternating drive signal, to provide a net charge to the charge accumulator that provides a measure of coupling between the transmit electrode and the receive electrode. - View Dependent Claims (20, 21)
-
-
22. A display and user input device, comprising:
-
a display substrate comprising a plate and display components formed on the plate; and an electric field sensing arrangement comprising; one or more transmit electrodes that are driven by an alternating drive signal; a plurality of receive electrodes that are configured to receive transmitted signals from the one or more transmit electrodes; and one or more current sensors that are configured to measure induced current in the plurality of receive electrodes, wherein; the plurality of receive electrodes are arranged as a two-dimensional array of electrode areas on the plate; the display components comprise pixel electrodes;
at least some of the one or more receive electrodes are interspersed amongst an array of the pixel electrodes; andat least some of the one or more receiver electrodes also serve as at least some of the pixel electrodes. - View Dependent Claims (23)
-
Specification