OPTICAL SHUTTERED TOUCHSCREEN AND METHOD THEREFOR
First Claim
1. A touchscreen display system comprising:
- a touchscreen with a first layer for sensing tactile inputs on a face of the touchscreen and a second layer having a plurality of optical shutter segments;
a touchscreen input detector coupled to the first layer and determining a touchscreen input in response to sensing the tactile inputs for a sensing time interval; and
a driver coupled to the second layer and providing a drive voltage at a first voltage level to the plurality of optical shutter segments during a first portion of the sensing time interval and maintaining the drive voltage at a second voltage level during a second portion of the sensing time interval, wherein the second voltage level is substantially zero volts, and wherein the first portion appended by the second portion is substantially the sensing time interval, the second portion being greater than half of the sensing time interval.
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Accused Products
Abstract
A touchscreen display system (418) is provided which includes a touchscreen (420), a touchscreen input detector (422), a capacitive sensor driver (423), and a display driver (424). The touchscreen input detector (422) is coupled to a first layer (504) of the touchscreen (420) and determines a touchscreen (420) input in response to sensing tactile inputs during a sensing time interval (610). The display driver (424) is coupled to a second layer (506) of the touchscreen (420) and provides a drive voltage (606, 608) at a first voltage level to the plurality of optical shutter segments (508) during a first portion (620) of the sensing time interval (610) and maintains the drive voltage (606, 608) at substantially zero volts during a second portion (622) of the sensing time interval (610), the second portion (622) being greater than half of the sensing time interval (610).
45 Citations
19 Claims
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1. A touchscreen display system comprising:
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a touchscreen with a first layer for sensing tactile inputs on a face of the touchscreen and a second layer having a plurality of optical shutter segments; a touchscreen input detector coupled to the first layer and determining a touchscreen input in response to sensing the tactile inputs for a sensing time interval; and a driver coupled to the second layer and providing a drive voltage at a first voltage level to the plurality of optical shutter segments during a first portion of the sensing time interval and maintaining the drive voltage at a second voltage level during a second portion of the sensing time interval, wherein the second voltage level is substantially zero volts, and wherein the first portion appended by the second portion is substantially the sensing time interval, the second portion being greater than half of the sensing time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for determining touchscreen inputs in response to sensing tactile inputs on a face of a touchscreen with a plurality of optical shutter segments while optically shuttering the touchscreen, the method comprising:
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charging a capacitive sensor layer of the touchscreen while providing a drive voltage at a first voltage level to the plurality of optical shutter segments during a first time interval; and sensing a charge fluctuation on the capacitive sensor layer while maintaining the drive voltage at a second voltage level of substantially zero volts during a second time interval, wherein the first time interval and the second time interval combine to form a sensing time interval for sensing touchscreen inputs, the second time interval being greater than half of the sensing time interval. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A semiconductor device for driving a touchscreen having a plurality of optical shutter segments, the semiconductor device comprising:
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a timing device for measuring a sensing time interval comprising a first portion and a remaining portion; and a capacitive sensor driver coupled to the timing device and providing a charging voltage to a capacitive sensing layer of the touchscreen during the first portion of the sensing time interval to charge the capacitive sensing layer; and a driver coupled to the timing device and providing a drive voltage at a first voltage level to the plurality of optical shutter segments during the first portion of the sensing time interval and maintaining the drive voltage at a second voltage level during the remaining portion of the sensing time interval, wherein the second voltage level is substantially zero volts, and wherein the first portion of the sensing time interval is less than half of the sensing time interval. - View Dependent Claims (17, 18, 19)
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Specification