Method and apparatus for reducing flat panel display horizontal scan signal interference in the electrostatic pen operated digitizer
First Claim
1. A method for reducing interference in a display coupled with a stylus driven digitizing panel, each of said display and said stylus having an operating frequency comprising:
- (a) determining at least one of the operating frequency of the display and the operating frequency of the stylus;
(b) adjusting at least one of the operating frequency of the display and the operating frequency of the stylus until the operating frequency causing a reduction in interference is ascertained, said interference caused by an interaction between said display operating frequency and said stylus operating frequency; and
(c) setting the operating frequency to said operating frequency ascertained to cause the reduced interference.
11 Assignments
0 Petitions
Accused Products
Abstract
A flat panel display is coupled with an electrostatic stylus driven digitizing panel to produce a display and digitizer system having an interference control feature. The interference control feature first determines the operating frequency of the flat panel display and/or the operating frequency of the stylus. The interference controller may then incrementally reduce the operating frequency of the flat panel display and/or the operating frequency of the stylus until the operating frequency causing the least interference is ascertained. Once the operating frequency causing the least interference is ascertained the interference controller selects new operating parameters for the display and digitizer system.
95 Citations
32 Claims
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1. A method for reducing interference in a display coupled with a stylus driven digitizing panel, each of said display and said stylus having an operating frequency comprising:
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(a) determining at least one of the operating frequency of the display and the operating frequency of the stylus; (b) adjusting at least one of the operating frequency of the display and the operating frequency of the stylus until the operating frequency causing a reduction in interference is ascertained, said interference caused by an interaction between said display operating frequency and said stylus operating frequency; and (c) setting the operating frequency to said operating frequency ascertained to cause the reduced interference. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a display and digitizer system, comprising the steps of:
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measuring noise produced at least partially by an external signal source; and adjusting an operating frequency of the display to reduce the noise; wherein the operating frequency of said display is selectable and the operating frequency of said digitizer is fixed and wherein the operating frequency of the digitizer is at least one of known and determined and the operating frequency of said display is determined and adjusted incrementally until the operating frequency of said display causing the least interference is ascertained and wherein said ascertained least interference frequency of said display is selected. - View Dependent Claims (9, 10, 11, 12)
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13. An apparatus for reducing interference in a display and digitizing panel system wherein said display has a scan frequency and said digitizing panel has a stylus input, comprising:
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(a) a controller operably connected to said display and controlling the scan frequency of said display, said controller displaying a target on said display and prompting a user to touch the stylus to the displayed target; and (b) a stylus and target variance determiner determining the scan frequency producing a reduced stylus and target variance and for selecting the scan frequency producing the reduced stylus and target variance.
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14. A method for reducing interference in a display coupled with a stylus driven digitizing panel, each of said display and said stylus having an operating frequency, comprising:
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(a) determining at least one of the operating frequency of the display and the operating frequency of the stylus; (b) adjusting at least one of the operating frequency of the display and the operating frequency of the stylus to a plurality of test frequencies; (c) ascertaining which of said plurality of test frequencies causes reduced interference; and (d) setting the operating frequency to one of said test frequencies ascertained to cause the reduced interference. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method for reducing interference in a display coupled with a stylus driven digitizing panel, comprising:
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(a) determining at least one of the operating frequency of the display and the operating frequency of the stylus; (b) adjusting at least one of the operating frequency of the display and the operating frequency of the stylus until the operating frequency causing a reduced interference is ascertained; and (c) setting the operating frequency to said operating frequency ascertained to cause the reduced interference, wherein the operating frequency of said display is selectable and the operating frequency of said stylus is fixed and wherein the operating frequency of the stylus is at least one of known and determined and the operating frequency of said display is determined and adjusted incrementally until the operating frequency of said display causing the least interference is ascertained and wherein said ascertained least interference frequency of said display is selected. - View Dependent Claims (22, 23, 24, 25)
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26. An apparatus for reducing interference in a display coupled with a stylus driven digitizing panel system, said apparatus comprising:
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a display, said display having an operating frequency; a stylus, said stylus having an operating frequency; a digitizing tablet; and a controller operably connected to at least one of said display and said stylus, said controller; determining at least one of the operating frequency of the display and the operating frequency of the stylus; adjusting at least one of the operating frequency of the display and the operating frequency of the stylus until the operating frequency causing a reduced interference is ascertained, said interference caused by an interaction between said display and said stylus; and setting the operating frequency to said operating frequency ascertained to cause the reduced interference. - View Dependent Claims (27, 28, 29, 30, 31, 32)
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Specification