Multi-touch touch screen with single-layer ITO bars arranged in parallel
First Claim
Patent Images
1. A touch screen, comprising:
- a plurality of conductive bars arranged in parallel to each other, each of the conductive bars including a single conductive layer with a substantially rectangular shape; and
a touch screen controller coupled to the conductive bars, the controller configured to;
apply a first excitation signal to a first end of one of the conductive bars and measure a first response signal corresponding to the first excitation signal at a second end of said one of the conductive bars, the touch screen controller configured to determine a position of a touch on said one of the conductive bars in a first direction along said one of the conductive bars based on a first difference between the first response signal and the first excitation signal;
apply a second excitation signal to the second end of said one of the conductive bars and measure a second response signal at the first end of said one of the conductive bars, the touch screen controller configured to determine the position of the touch on said one of the conductive bars in the first direction along said one of the conductive bars based on the first difference between the first response signal and the first excitation signal and a second difference between the second response signal and the second excitation signal; and
determine the positions of multiple touches on the touch screen that occur substantially simultaneously on different ones of the conductive bars.
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Abstract
A touch screen includes a plurality of single-layer ITO bars having a substantially rectangular shape and arranged in parallel to each other in order to detect touches on the touch screen. The location of a touch on the touch screen in the direction along an ITO bar is determined by applying a signal on one end of the ITO bar and measuring the change in the amplitude and the delay of the signal on the opposite end of the ITO bar. Such application and measurement of the signal can be repeated with the application of the signal occurring on the opposite end of the ITO bar and the measurement of the signal occurring on said one end of the ITO bar, in order to enhance the accuracy of the measurement.
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Citations
17 Claims
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1. A touch screen, comprising:
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a plurality of conductive bars arranged in parallel to each other, each of the conductive bars including a single conductive layer with a substantially rectangular shape; and a touch screen controller coupled to the conductive bars, the controller configured to; apply a first excitation signal to a first end of one of the conductive bars and measure a first response signal corresponding to the first excitation signal at a second end of said one of the conductive bars, the touch screen controller configured to determine a position of a touch on said one of the conductive bars in a first direction along said one of the conductive bars based on a first difference between the first response signal and the first excitation signal; apply a second excitation signal to the second end of said one of the conductive bars and measure a second response signal at the first end of said one of the conductive bars, the touch screen controller configured to determine the position of the touch on said one of the conductive bars in the first direction along said one of the conductive bars based on the first difference between the first response signal and the first excitation signal and a second difference between the second response signal and the second excitation signal; and determine the positions of multiple touches on the touch screen that occur substantially simultaneously on different ones of the conductive bars. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch screen, comprising:
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a plurality of conductive bars arranged in parallel to each other, each of the conductive bars including a single conductive layer with a substantially rectangular shape; and a touch screen controller coupled to the conductive bars, the controller configured to apply a first excitation signal including digital pulses to a first end of one of the conductive bars and measure a first response signal corresponding to the first excitation signal at a second end of said one of the conductive bars both with and without a touch on said one of the conductive bars, and the touch screen controller further configured to apply a second excitation signal including the digital pulses to the second end of said one of the conductive bars and measure a second response signal corresponding to the second excitation signal at the second end of said one of the conductive bars both with and without a touch on said one of the conductive bars, the touch screen controller configured to measure a first difference value (N1−
n1) between a first number n1 of the digital pulses and a second number N1 of the digital pulses needed for the first response signal to move from a first predetermined threshold to a second predetermined threshold with and without the touch, respectively,the touch screen controller configured to measure a second difference value (N2−
n2) between a third number n2 of the digital pulses and a fourth number N2 of the digital pulses needed for the second response signal to move from the first predetermined threshold to the second predetermined threshold with and without the touch, respectively, andthe touch screen controller determining a position of the touch on said one of the conductive bars in a direction along said one of the conductive bars based on the first difference value (N1−
n1) and the second difference value (N2−
n2). - View Dependent Claims (8, 9)
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10. In a touch screen including a plurality of conductive bars arranged in parallel to each other, each of the conductive bars including a single conductive layer with a substantially rectangular shape, a method of determining a position of a touch on the touch screen, the method comprising:
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applying a first excitation signal to a first end of one of the conductive bars; measuring a first response signal corresponding to the first excitation signal at a second end of said one of the conductive bars; determining the position of a touch on said one of the conductive bars in a first direction along said one of the conductive bars based on a first difference between the first response signal and the first excitation signal; applying a second excitation signal to the second end of said one of the conductive bars; measuring a second response signal at the first end of said one of the conductive bars; determining the position of the touch on said one of the conductive bars in the first direction along said one of the conductive bars based on the first difference between the first response signal and the first excitation signal and a second difference between the second response signal and the second excitation signal; and determining the positions of multiple touches on the touch screen that occur substantially simultaneously on different ones of the conductive bars. - View Dependent Claims (11, 12, 13, 14)
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15. In a touch screen including a plurality of conductive bars arranged in parallel to each other, each of the conductive bars including a single conductive layer with a substantially rectangular shape, a method of determining a position of a touch on the touch screen, the method comprising:
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applying a first excitation signal including digital pulses to a first end of one of the conductive bars both with and without a touch on said one of the conductive bars; measuring a first response signal corresponding to the first excitation signal at a second end of said one of the conductive bars both with and without the touch on said one of the conductive bars; applying a second excitation signal including the digital pulses to the second end of one of the conductive bars both with and without the touch on said one of the conductive bars; measuring a second response signal corresponding to the second excitation signal at the second end of said one of the conductive bars both with and without the touch on said one of the conductive bars; determining a first difference value (N1−
n1) between a first number n1 of the digital pulses and a second number N1 of the digital pulses needed for the first response signal to move from a first predetermined threshold to a second predetermined threshold with and without the touch, respectively,determining a second difference value (N2−
n2) between a third number n2 of the digital pulses and a fourth number N2 of the digital pulses needed for the second response signal to move from the first predetermined threshold to the second predetermined threshold with and without the touch, respectively, anddetermining the position of the touch on said one of the conductive bars in a direction along said one of the conductive bars based on the first difference value (N1−
n1) and the second difference value (N2−
n2). - View Dependent Claims (16, 17)
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Specification