Dynamic adjustment of touch resolutions on an AMOLED display

• US 9,952,698 B2
• Filed: 03/03/2014
• Issued: 04/24/2018
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Chaji, Gholamreza
• Primary Examiner(s): Yang, Nan-Ying
• Application Number:
  US14/776,887
• Publication Number:
  US 20160041668A1
• Time in Patent Office: 1,513 Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

Dynamically adjusting a touch resolution of a display having pixel circuits each including an OLED driven by a driving transistor according to programming information representing a desired brightness for each OLED. A first touch resolution of the display is defined to create first touch zones relative to the display as images are being displayed thereon. A first touch in one of the first touch zones is detected by measuring a voltage across an anode and a cathode of each of a first set of OLEDs in the first touch zone. The first touch resolution is dynamically changed to a different second touch resolution to create second touch zones as further images are being displayed. A second touch in one of the second touch zones is detected by measuring a voltage across an anode and a cathode of each of a second set of OLEDs in the second touch zone.

Claims

1. A method of dynamically adjusting a touch resolution of a video display having a plurality of pixel circuits each including a light emitting device driven by a driving transistor according to a programming current or voltage representing a desired brightness produced by the light emitting device, comprising:

defining, by a controller, a first touch resolution of the video display to create a first plurality of capacitive touch zones relative to a transparent substrate of the video display as images are being displayed on the video display;

detecting a first touch on the transparent substrate in a first touch zone of the first plurality of capacitive touch zones by measuring a voltage across an anode and a cathode of each of a first set of light emitting devices of the video display in the first touch zone;

dynamically changing, by the controller, the first touch resolution to a second touch resolution different from the first touch resolution to create a second plurality of capacitive touch zones relative to the video display as further images are being displayed on the video display; and

detecting a second touch in a second touch zone of the second plurality of capacitive touch zones by measuring a voltage across an anode and a cathode of each of a second set of light emitting devices of the video display in the second touch zone, wherein each light emitting of the first set of light emitting devices and each light emitting device of the second set of light emitting devices is self-emitting.

2. The method of claim 1, wherein the measuring corresponding changes in the voltage across each of the first set of light emitting devices includes:

activating each of a first set of read transistors connected to corresponding ones of the first set of light emitting devices thereby connecting each of the first set of read transistors to a readout circuit;

comparing the measured voltage from each of the first set of activated read transistors with a criterion indicative of a touch; and

responsive to the comparing indicating that the criterion is satisfied, the controller indicating a coordinate of the first touch relative to the video display in the first touch zone.

3. The method of claim 2, wherein a gate of each of the first set of read transistors is connected to a corresponding readout select line, and wherein a first terminal of each of the first set of read transistors is connected to a corresponding monitor line that is connected to the readout circuit, wherein the activating includes activating each of the gates of the first set of read transistors simultaneously with activating the corresponding monitor line connected to readout circuit.

4. The method of claim 3, further comprising:

simultaneously with the detecting, determining from the measured voltage an aging characteristic of the driving transistor or of the light emitting device of a selected pixel circuit in the first touch zone;

adjusting the programming current or voltage for the selected pixel circuit to compensate for the determined aging characteristic; and

driving the light emitting device in the selected pixel circuit according to the adjusted programming current or voltage.

5. The method of claim 1, wherein the detecting is carried out simultaneously with programming each of the pixel circuits in the first touch zone with a desired brightness.

6. The method of claim 1, wherein the first touch resolution corresponds to a surface area of a tip of an average human finger, and wherein the second touch resolution corresponds to a surface area of a point of a capacitive stylus, or vice versa.

7. The method of claim 1, wherein a maximum number of touch zones definable relative to the video display corresponds exactly to the number of pixels in the video display such that each of the pixels in the video display corresponds to a discrete touch point.

8. The method of claim 1, wherein a size of the first touch resolution is N×

M such that N is an integer not greater than the total number of rows of pixel circuits forming the video display and M is an integer not greater than the total number of columns of pixel circuits forming the video display, and wherein a size of the second touch resolution is P×

Q such that P is an integer not greater than the total number of rows of pixel circuits forming the video display and Q is an integer not greater than the total number of columns of pixel circuits forming the video display, where N×

M is distinct from P×

Q.

9. The method of claim 1, wherein the video display is an active matrix organic light-emitting organic device (AMOLED) display, and each of the light emitting devices is an organic light emitting device (OLED).