LIQUID CRYSTAL DISPLAY DEVICE AND DRIVE METHOD THEREFOR
First Claim
1. A liquid crystal display device comprising:
- a liquid crystal panel for displaying an image supplied from outside;
a driving section for driving the liquid crystal panel in accordance with a driving signal;
a capacitive touch sensor for detecting a change in capacitance, the capacitive touch panel being provided so as to overlap the liquid crystal panel;
a control section for scanning the capacitive touch sensor in accordance with a reference clock signal which is generated by an oscillation circuit provided in the liquid crystal display device;
a counting section for counting a frequency of the driving signal;
a determining section for determining whether or not the frequency of the driving signal is a predetermined value; and
a changing section for changing, in a case where the determining section determines that the frequency of the driving signal is not the predetermined value, a frequency at which the capacitive touch sensor is scanned.
1 Assignment
0 Petitions
Accused Products
Abstract
A liquid crystal display devices (1a, 1b) each include a touch panel (2), a liquid crystal panel (3), a touch panel controller (4), a liquid crystal driving controller (timing generator) (5), oscillation circuits (7a, 7b), a correcting circuit (10), and a frequency counter (11). The frequency counter (11) counts a reference clock signal CLK supplied from the oscillation circuit (7a) or (7b). The correcting circuit (10) determines, in accordance with information supplied from the frequency counter (11), whether or not a frequency of the reference clock signal CLK is a predetermined frequency. In a case where the frequency of the reference clock signal CLK is not the predetermined frequency, the correcting circuit (10) corrects (i) a frequency at which the liquid crystal panel (3) is driven or (ii) a frequency at which sensing of the touch panel (2) is carried out.
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Citations
10 Claims
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1. A liquid crystal display device comprising:
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a liquid crystal panel for displaying an image supplied from outside; a driving section for driving the liquid crystal panel in accordance with a driving signal; a capacitive touch sensor for detecting a change in capacitance, the capacitive touch panel being provided so as to overlap the liquid crystal panel; a control section for scanning the capacitive touch sensor in accordance with a reference clock signal which is generated by an oscillation circuit provided in the liquid crystal display device; a counting section for counting a frequency of the driving signal; a determining section for determining whether or not the frequency of the driving signal is a predetermined value; and a changing section for changing, in a case where the determining section determines that the frequency of the driving signal is not the predetermined value, a frequency at which the capacitive touch sensor is scanned. - View Dependent Claims (2, 3, 4)
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5. A liquid crystal display device comprising:
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a liquid crystal panel for displaying an image supplied from outside; a driving section for driving the liquid crystal panel in accordance with a driving signal; a capacitive touch sensor for detecting a change in capacitance, the capacitive touch panel being provided so as to overlap the liquid crystal panel; a control section for scanning the capacitive touch sensor in accordance with a reference clock signal which is generated by an oscillation circuit provided in the liquid crystal display device; a counting section for counting a frequency of the reference clock signal; a determining section for determining whether or not the frequency of the reference clock signal is a predetermined value; and a changing section for changing, in a case where the determining section determines that the frequency of the reference clock signal is not the predetermined value, a frequency at which the liquid crystal panel is driven. - View Dependent Claims (6, 7, 8)
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9. A method for driving a liquid crystal display device,
the liquid crystal display device including: -
a liquid crystal panel for displaying an image supplied from outside; a driving section for driving the liquid crystal panel in accordance with a driving signal; a capacitive touch sensor for detecting a change in capacitance, the capacitive touch panel being provided so as to overlap the liquid crystal panel; and a control section for scanning the capacitive touch sensor in accordance with a frequency of a reference clock signal which is generated by an oscillation circuit provided in the liquid crystal display device, the method comprising the steps of; (a) counting a frequency of the driving signal; (b) determining whether or not the frequency of the driving signal is a predetermined value; and (c) changing, in a case where the frequency of the driving signal is determined not to be the predetermined value in the step (b), a frequency at which the capacitive touch sensor is scanned.
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10. (canceled)
Specification