Methods of making and using an apparatus for providing multi-touch sensing capability using an LCD screen without an extra touch screen layer
First Claim
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1. A method of obtaining a visual display of an image and detecting a touch event on an LCD panel that has a plurality of row lines and a plurality of column lines, the method comprising the steps of:
- displaying an image on the LCD panel, the step of displaying including transmitting, in a predetermined sequential manner, visual display signals along the plurality of column lines and control signals along the plurality of row lines, wherein transmitting the visual display signals and the control signals results in periods of non-use for the displaying for each of the plurality of column lines and the plurality of row lines; and
detecting the touch event using radio frequency touch signals propagated through at least some of the plurality of row lines and at least some of the plurality of column lines, wherein the step of detecting the touch event occurs during the periods of non-use for the displaying, including the periods of non-use for the at least some of the plurality of row lines and the at least some of the plurality of column lineswherein the propagated radio frequency touch signals consist of radio frequency touch transmit signals and result in radio frequency touch receive signals and wherein the step of detecting includes;
propagating the radio frequency touch signals by transmitting radio frequency touch transmit signals that originate along the at least some of the plurality of row lines and the at least some of the plurality of column lines; and
detecting radio frequency touch receive signals received from the at least some of the plurality of row lines and the at least some of plurality of column lines.
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Abstract
The present invention relates to methods of making and using and apparatus for providing touch screen capability using an LCD screen without an extra touch screen layer.
7 Citations
18 Claims
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1. A method of obtaining a visual display of an image and detecting a touch event on an LCD panel that has a plurality of row lines and a plurality of column lines, the method comprising the steps of:
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displaying an image on the LCD panel, the step of displaying including transmitting, in a predetermined sequential manner, visual display signals along the plurality of column lines and control signals along the plurality of row lines, wherein transmitting the visual display signals and the control signals results in periods of non-use for the displaying for each of the plurality of column lines and the plurality of row lines; and detecting the touch event using radio frequency touch signals propagated through at least some of the plurality of row lines and at least some of the plurality of column lines, wherein the step of detecting the touch event occurs during the periods of non-use for the displaying, including the periods of non-use for the at least some of the plurality of row lines and the at least some of the plurality of column lines wherein the propagated radio frequency touch signals consist of radio frequency touch transmit signals and result in radio frequency touch receive signals and wherein the step of detecting includes; propagating the radio frequency touch signals by transmitting radio frequency touch transmit signals that originate along the at least some of the plurality of row lines and the at least some of the plurality of column lines; and detecting radio frequency touch receive signals received from the at least some of the plurality of row lines and the at least some of plurality of column lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of obtaining a visual display of an image and detecting a touch event on an LCD panel that has a plurality of row lines and a plurality of column lines, the method comprising the steps of:
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displaying an image on the LCD panel, the step of displaying including transmitting, in a predetermined sequential manner, visual display signals along the plurality of column lines and control signals along the plurality of row lines; detecting the touch event using radio frequency touch signals propagated through at least some of the plurality of row lines and at least some of the plurality of column lines, wherein the step of detecting includes monitoring the propagated radio frequency touch signals to identify a disturbance to the radio frequency touch signals indicative of the touch event; initially obtaining at least one calibration value for the some of the plurality of row lines and some of the plurality of column lines by detecting a touch test signal propagated through at least one of the plurality of row lines and the plurality of column lines during a non-touch period; storing the at least one calibration value; and wherein the monitoring compares the at least one calibration value to different detected values of the radio frequency touch signals, such that the disturbance is indicated by a difference that exceeds a predetermined threshold between at least one of the detected values and the calibration value. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of obtaining a visual display of an image and detecting a touch event on an LCD panel that has a plurality of row lines and a plurality of column lines, the method comprising the steps of:
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displaying an image on the LCD panel, the step of displaying including transmitting, in a predetermined sequential manner, visual display signals along the plurality of column lines and control signals along the plurality of row lines, wherein transmitting the visual display signals and the control signals results in periods of non-use for the displaying for each of the plurality of row lines and the plurality of column lines; and detecting the touch event using radio frequency touch signals that are transmitted from a source inside the LCD panel and propagated through at least some of the plurality of row lines and at least some of the plurality of column lines, wherein the step of detecting the touch event occurs during the periods of non-use for the displaying, including the periods of non-use for the at least some of the plurality of row lines and the at least some of the plurality of column lines, wherein the propagated radio frequency touch signals are one of a sine (or cosine) signal, an arbitrary waveform signal, a combination of a sine and cosine signals, a combination of amplitude-modulated sine and cosine signals, a combination of phase-modulated sine and cosine signals, a combination of frequency-modulated since and cosine signals, a combination of pseudo-random-code modulated sine and cosine signals, and a combination of two orthogonal signals. - View Dependent Claims (18)
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Specification