Display device with touch panel
First Claim
Patent Images
1. A display device with touch panel comprising:
- a display panel; and
an electrostatic capacitance coupling type touch panel arranged on a surface on an observer side of the display panel,the touch panel including;
plural first electrodes extending in a first direction;
plural second electrodes extending in a second direction different from the first direction;
a driving circuit;
a detection circuit; and
a coordinate-position calculating circuit that calculates a touch position on the touch panel touched by the observer, whereinthe driving circuit sequentially selects two first electrodes out of the plural first electrodes, supplies a high potential voltage higher than a reference voltage to a first selected first electrode of the selected two first electrodes, and supplies the reference voltage to a second selected first electrode of the selected two first electrodes,the detection circuit selects at least one second electrode out of the plural second electrodes and detects a capacitance difference (A−
B) between a capacitor A between a first selected second electrode of the at least one second electrode and the first selected first electrode to which the high potential voltage is supplied and a capacitor B between the first selected second electrode and the second selected first electrode to which the reference voltage is supplied, andthe coordinate-position calculating circuit calculates a touch position on the touch panel touched by the observer based on positions of the selected two first electrodes and the first selected second electrode and the capacitance difference (A−
B).
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Abstract
A touch panel includes plural first electrodes extending in a first direction, plural second electrodes extending in a second direction different from the first direction, a driving circuit, a detection circuit, and a coordinate-position calculating circuit. The driving circuit sequentially selects two first electrodes out of the plural first electrodes, supplies a high potential voltage higher than a reference voltage to one of the selected two first electrodes, and supplies the reference voltage to the other, the detection circuit detects a capacitance difference (A−B) between a capacitor A between a selected one of the second electrodes and the first electrode to which the high potential voltage is supplied and a capacitor B between the selected second electrode and the first electrode to which the reference voltage is supplied, and the coordinate-position calculating circuit calculates a touch position on the touch panel touched by the observer on the basis of positions of the selected first and second electrodes and the capacitance difference (A−B).
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Citations
19 Claims
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1. A display device with touch panel comprising:
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a display panel; and an electrostatic capacitance coupling type touch panel arranged on a surface on an observer side of the display panel, the touch panel including; plural first electrodes extending in a first direction; plural second electrodes extending in a second direction different from the first direction; a driving circuit; a detection circuit; and a coordinate-position calculating circuit that calculates a touch position on the touch panel touched by the observer, wherein the driving circuit sequentially selects two first electrodes out of the plural first electrodes, supplies a high potential voltage higher than a reference voltage to a first selected first electrode of the selected two first electrodes, and supplies the reference voltage to a second selected first electrode of the selected two first electrodes, the detection circuit selects at least one second electrode out of the plural second electrodes and detects a capacitance difference (A−
B) between a capacitor A between a first selected second electrode of the at least one second electrode and the first selected first electrode to which the high potential voltage is supplied and a capacitor B between the first selected second electrode and the second selected first electrode to which the reference voltage is supplied, andthe coordinate-position calculating circuit calculates a touch position on the touch panel touched by the observer based on positions of the selected two first electrodes and the first selected second electrode and the capacitance difference (A−
B). - View Dependent Claims (2, 3, 4, 5, 14, 17)
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6. A display device with touch panel comprising:
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a display panel; and an electrostatic capacitance coupling type touch panel arranged on a surface on an observer side of the display panel, the touch panel including; plural first electrodes extending in a first direction; plural second electrodes extending in a second direction different from the first direction; a driving circuit; a detection circuit; and a coordinate-position calculating circuit that calculates a touch position on the touch panel touched by the observer, wherein the driving circuit sequentially selects, in a period A, two first electrodes out of the plural first electrodes, supplies a high potential voltage higher than a reference voltage to a first selected first electrode of the selected two first electrodes, and supplies the reference voltage to a second selected first electrode of the selected two first electrodes and sequentially selects, in a period B, two second electrodes out of the plural second electrodes, supplies the high potential voltage higher than the reference voltage to a first selected second electrode of the selected two second electrodes, and supplies the reference voltage to a second selected second electrode of the selected two second electrodes, the detection circuit detects, in the period A, a capacitance difference (A−
B) between a capacitor A between each of the second electrodes and the first selected first electrode to which the high potential voltage is supplied and a capacitor B between each of the second electrodes and the second selected first electrode to which the reference voltage is supplied and detects, in the period B, a capacitance difference (C−
D) between a capacitor C between each of the first electrodes and the first selected second electrode to which the high potential voltage is supplied and a capacitor D between each of the first electrodes and the second selected second electrode to which the reference voltage is supplied, andthe coordinate-position calculating circuit calculates a touch position on the touch panel by the observer on the basis of the selected two first electrodes and the capacitance difference (A−
B) and the selected two second electrodes and the capacitance difference (C−
D). - View Dependent Claims (7, 8, 15)
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9. A display device with touch panel comprising:
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a display panel; and an electrostatic capacitance coupling type touch panel arranged on a surface on an observer side of the display panel, the touch panel including; plural first electrodes extending in a first direction; plural second electrodes extending in a second direction different from the first direction; a first electrode selection circuit; a second electrode selection circuit; a detection circuit; and a coordinate-position calculating circuit that calculates a touch position on the touch panel touched by the observer, wherein the first electrode selection circuit sequentially selects, in a period A, two first electrodes out of the plural first electrodes, supplies a high potential positive polarity pulse having a voltage level higher than a reference voltage to a first selected first electrode of the selected two first electrodes, and supplies a low potential negative polarity pulse having a voltage level lower than the reference voltage to a second selected first electrode of the selected two first electrodes, the second electrode selection circuit sequentially selects, in a period B, two second electrodes out of the plural second electrodes, supplies a high potential positive polarity pulse having a voltage level higher than the reference voltage to a first selected second electrode of the selected two second electrodes, and supplies a low potential negative polarity pulse having a voltage level lower than the reference voltage to a second selected second electrode of the selected two second electrodes, the detection circuit detects, in the period A, a capacitance difference (A−
B) between a capacitor A between each of the second electrodes and the first selected first electrode to which the positive polarity pulse is supplied and a capacitor B between each of the second electrodes and the second selected first electrode to which the negative polarity pulse is supplied and detects, in the period B, a capacitance difference (C−
D) between a capacitor C between each of the first electrodes and the first selected second electrode to which the positive polarity pulse is supplied and a capacitor D between each of the first electrodes and the second selected second electrode to which the negative polarity pulse is supplied, andthe coordinate-position calculating circuit calculates a touch position on the touch panel by the observer on the basis of the selected two first electrodes and the capacitance difference (A−
B) and the selected two second electrodes and the capacitance difference (C−
D). - View Dependent Claims (10, 11, 12, 13, 16, 18, 19)
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Specification
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Current AssigneePaneltouch Technologies LLC (Touch Display LLC)
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Original AssigneeJapan Display East Incorporated (Japan Display Incorporated), Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
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InventorsSato, Hideo, Nishitani, Shigeyuki, Saito, Teruaki
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Primary Examiner(s)MANDEVILLE, JASON M
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Application NumberUS12/155,609Publication NumberTime in Patent Office1,817 DaysField of Search345156-158, 345173-178, 178/18.01, 178/18.03, 178/18.06US Class Current345/173CPC Class CodesG02F 1/13338 Input devices, e.g. touch p...G06F 3/04166 Details of scanning methods...G06F 3/0445 using two or more layers of...G06F 3/0446 using a grid-like structure...
