Flat Panel Display Screen Operable For Touch Position Prediction Methods

• US 20140009439A1
• Filed: 08/07/2013
• Published: 01/09/2014
• Est. Priority Date: 03/17/2006
• Status: Active Grant

• Current Assignee: Jeffrey C. Konicek
• Original Assignee: Jeffrey C. Konicek
• Inventors: Konicek, Jeffrey C.
• Granted Patent: US 9,207,797 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners
• CPC Class Codes: G06V 40/12 Fingerprints or palmprints

Abstract

A system and method are disclosed that determines the location of an object touching a display screen. The system and method modifies already existing display technology, including using the underlying structure of many types of existing displays as the touch detecting structure. The systems and methods are applicable to virtually all LCD and LCD-like displays, including emissive displays (OLED, PLED, quantum dot displays, etc.), electronic paper, and others.

Claims

1-13. -13. (canceled)

14. A method of constraining touch contact on a display screen to at least one probable point of touch contact, based on recorded locations of past touch contact, thereby reducing touch contact determination errors from unintended touch contact on the display screen, wherein the display screen includes a plurality of display pixels operable for determining touch contact with the display, comprising the acts of:

a. determining, using a processor and a memory storing at least one previously recorded touch contact point with the display screen, a trajectory of past touch contact points;

b. determining, using the processor, a property of the trajectory of past touch contact points;

c. determining, using the processor, at least one likely next touch contact point on the display screen using the property of the trajectory of past touch contact points;

d. determining a new touch contact point on the display screen based on an instance of physical contact with the display, using at least one of the plurality of display pixels operable for determining touch contact with the display;

e. determining, using the processor, that the new touch contact point has a lower probability of intended touch contact than the at least one likely next touch contact point; and

f. disregarding the new touch contact point, using the processor, if the lower probability of intended touch contact is determined to be below a set probability threshold.

15. The method of claim 14 wherein the determined property of the trajectory of past touch contact points is the direction of movement.

16. The method of claim 14 wherein the determined property of the trajectory of past touch contact points is the acceleration of movement.

17. The method of claim 14 wherein the determined property of the trajectory of past touch contact points is the curvature of movement.

18. The method of claim 14 further comprising monitoring, after determining the at least one likely next touch contact point, pixel capacitance to determine whether the likely next touch contact point is touched.

19. A display screen that constrains touch contact on the display screen to at least one probable point of touch contact, based on recorded locations of past touch contact, thereby reducing touch contact determination errors from unintended touch contact on the display screen, the display screen comprising:

a. a plurality of display pixels operable for determining touch contact with the display;

b. a memory that stores at least one previously recorded touch contact point with the display screen;

c. a processor coupled to the memory and the plurality of pixels;

d. the processor configured to determine a trajectory of past touch contact points based on the memory storing at least one previously recorded touch contact point;

e. the processor configured to determine a property of the trajectory of past touch contact points;

f. the processor configured to determine at least one likely next touch contact point on the display screen using the property of the trajectory of past touch contact points;

g. the processor configured to determine a new touch contact point on the display based on an instance of physical contact with the display, using at least one of the plurality of display pixels operable for determining touch contact with the display;

h. the processor configured to determine that the new touch contact point has a lower probability of intended touch contact than the at least one likely next touch contact point; and

i. the processor configured to disregard the new touch contact point if the lower probability of intended touch contact is determined to be below a set probability threshold.

20. The display of claim 19 wherein the determined property of the trajectory of past touch contact points is the direction of movement.

21. The display of claim 19 wherein the determined property of the trajectory of past touch contact points is the acceleration of movement.

22. The display of claim 19 wherein the determined property of the trajectory of past touch contact points is the curvature of movement.

23. The method of claim 19 further comprising monitoring, after determining the at least one likely next touch contact point, pixel capacitance to determine whether the likely next touch contact point is touched.