LCD and touch-control method thereof
First Claim
1. A touch-control method of an LCD, which is to sense a touch point on an LCD screen of the LCD, the LCD comprising a counter electrode panel and a substrate having a plurality of data lines and a plurality of scan lines, the method comprising:
- a first touch-position sensing step, which detects values of liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode panel, respectively, and detects a scan-line-direction touch position according to the values of the liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode panel during idling time in-between writing periods, each of the scan lines turning on sequentially to write image data into the LCD screen in the writing periods;
a charging step, which charges a voltage signal into each of the data lines needed to be detected after the scan-line-direction touch position is detected; and
a second touch-position sensing step, which detects values of liquid crystal capacitances formed between the data lines needed to be detected and the counter electrode panel, respectively, and detects a data-line-direction touch position according to the values of the liquid crystal capacitances formed between the data lines needed to be detected and the counter electrode panel after the voltage signal is charged, wherein, the scan-line-direction touch position and the data-line-direction touch position indicate a position of the touch point.
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Abstract
A touch-control method of an LCD includes a first touch-position sensing step, a charging step, and a second touch-position sensing step. During the idling time in-between the writing periods in which each scan line turns on sequentially to write the image data into the LCD screen, the first touch-position sensing step detects the values of liquid crystal capacitances formed between the scan lines and the counter electrode panel, and detects a scan-line-direction touch position (Y) according to the values of the liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode panel. The charging step charges a voltage signal into each of the data lines needed to be detected after the scan-line-direction touch position (Y) is detected. After the voltage signal is charged, the second touch-position sensing step detects the values of liquid crystal capacitance formed between the data lines and the counter electrode panel, and detects a data-line-direction touch position (X) according to the values of the liquid crystal capacitance formed between the data lines needed to be detected and the counter electrode panel. Accordingly, the detected scan-line-direction touch position (Y) and the detected data-line-direction touch position (X) indicate the position of the touch point. Furthermore, this invention also provides an LCD with a touch-control function.
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Citations
24 Claims
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1. A touch-control method of an LCD, which is to sense a touch point on an LCD screen of the LCD, the LCD comprising a counter electrode panel and a substrate having a plurality of data lines and a plurality of scan lines, the method comprising:
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a first touch-position sensing step, which detects values of liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode panel, respectively, and detects a scan-line-direction touch position according to the values of the liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode panel during idling time in-between writing periods, each of the scan lines turning on sequentially to write image data into the LCD screen in the writing periods;
a charging step, which charges a voltage signal into each of the data lines needed to be detected after the scan-line-direction touch position is detected; and
a second touch-position sensing step, which detects values of liquid crystal capacitances formed between the data lines needed to be detected and the counter electrode panel, respectively, and detects a data-line-direction touch position according to the values of the liquid crystal capacitances formed between the data lines needed to be detected and the counter electrode panel after the voltage signal is charged, wherein, the scan-line-direction touch position and the data-line-direction touch position indicate a position of the touch point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An LCD (liquid crystal display), which has a counter electrode panel and a substrate having a plurality of data lines and a plurality of scan lines, comprising:
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a first sensing circuit, which respectively electrically connects to the scan lines needed to be detected, detects values of liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode panel, and detects a scan-line-direction touch position according to the values of the liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode panel;
a timing control circuit, which electrically connects to the first sensing circuit and controls the first sensing circuit to detect the liquid crystal capacitances formed between the scan lines needed to be detected and the counter electrode panel during idling time in-between writing periods, each of the scan lines turning on sequentially to write image data into the LCD screen in the writing periods;
a voltage-signal generating circuit, which electrically connects to the timing control circuit and each of the data lines, wherein the timing control circuit controls the voltage-signal generating circuit to charge a voltage signal into each of the data lines needed to be detected after the scan-line-direction touch position is detected; and
a second sensing circuit, which respectively electrically connects to each of the data lines needed to be detected, detects values of liquid crystal capacitances formed between the data lines needed to be detected and the counter electrode panel, and detects a data-line-direction touch position according to the values of the liquid crystal capacitances formed between the data lines needed to be detected and the counter electrode panel after the voltage signal is charged. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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Specification