Display Device with Touch Panel

• US 20090315858A1
• Filed: 06/17/2009
• Published: 12/24/2009
• Est. Priority Date: 06/19/2008
• Status: Abandoned Application

• Current Assignee: Japan Display East Incorporated (Japan Display Incorporated)
• Original Assignee: Hitachi Displays Limited (Japan Display Incorporated)
• Inventors: Sato, Hideo, Nishitani, Shigeyuki, Mamba, Norio, Saito, Teruaki
• Application Number:
  US12/486,003
• Publication Number:
  US 20090315858A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

A present display device with a highly reliable capacitive touch panel includes: a display panel; and a capacitive touch panel which is placed on an observer side of the display panel, in which the touch panel includes a first substrate and a second substrate which are arranged to face each other, in which the first substrate includes on a surface thereof, which is opposed to the second substrate: a plurality of first electrodes which extend in a first direction side by side; and a plurality of second electrodes which extend in the second direction to intersect the plurality of first electrodes side by side, in which the second substrate includes on a surface thereof, which is opposed to the first substrate a planar third electrode, and the display device includes a gel-like sheet interposed between the plurality of first electrodes and the plurality of second electrodes, and the third electrode.

Claims

1. A display device with a touch panel, comprising:

a display panel; and

a capacitive touch panel which is placed on an observer side of the display panel,

wherein the touch panel includes a first substrate and a second substrate which are arranged to face each other,

wherein the first substrate includes on a surface thereof, which is opposed to the second substrate;

a plurality of first electrodes which extend in a first direction and are arranged side by side in a second direction intersecting the first direction; and

a plurality of second electrodes which extend in the second direction to intersect the plurality of first electrodes and are arranged side by side in the first direction,

wherein the second substrate includes on a surface thereof, which is opposed to the first substrate a planar third electrode which covers the plurality of first electrodes and the plurality of second electrodes, and

wherein the display device includes a gel-like sheet interposed between the plurality of first electrodes and the plurality of second electrodes, and the third electrode.

2. A display device with a touch panel according to claim 1, wherein the gel-like sheet has a hardness of 2 or more and 15 or less.

3. A display device with a touch panel according to claim 1,

wherein the first substrate and the second substrate each comprise a glass substrate, and

wherein the second substrate is thinner than the first substrate.

4. A display device with a touch panel according to claim 1,

wherein the first substrate comprises a glass substrate, and

wherein the second substrate comprises a plastic substrate.

5. A display device with a touch panel according to claim 1, wherein the first substrate and the second substrate each comprise a plastic substrate.

6. A display device with a touch panel according to claim 1, further comprising:

a driving circuit;

a detecting circuit; and

a coordinate position calculating circuit which calculates a touch point at which the touch panel is touched,

wherein the driving circuit sequentially selects two first electrodes among the plurality of first electrodes to supply a voltage higher in potential than a reference voltage to one of the selected two first electrodes and supply the reference voltage to another thereof,

wherein the detecting circuit detects a capacitance difference between a capacitor A and a capacitor B (A-B), the capacitor A being provided between a second electrode that is selected among the plurality of second electrodes and the first electrode to which the voltage higher in potential is supplied, the capacitor B being provided between the selected second electrode and the first electrode to which the reference voltage is supplied, and

wherein the coordinate position calculating circuit calculates a touch point at which the touch panel is touched based on locations of the selected two first electrodes and the selected second electrode and on the capacitance difference (A-B).

7. A display device with a touch panel according to claim 1, further comprising:

a driving circuit;

a detecting circuit; and

a coordinate position calculating circuit which calculates a touch point at which the touch panel is touched,

wherein, in a period A, the driving circuit sequentially selects two first electrodes among the plurality of first electrodes to supply a voltage higher in potential than a reference voltage to one of the selected two first electrodes and supply the reference voltage to another thereof and, in a period B, the driving circuit sequentially selects two second electrodes among the plurality of second electrodes to supply a voltage higher in potential than the reference voltage to one of the selected two second electrodes and supply the reference voltage to another thereof,

wherein, in the period A, the detecting circuit detects a capacitance difference between a capacitor A and a capacitor B (A-B), the capacitor A being provided between each of the selected two second electrodes and the first electrode to which the voltage higher in potential is supplied, the capacitor B being provided between the each of the selected two second electrodes and the first electrode to which the reference voltage is supplied, and in the period B, the detecting circuit detects a capacitance difference between a capacitor C and a capacitor D (C-D), the capacitance C being provided between each of the selected two first electrodes and the second electrode to which the voltage higher in potential is supplied, the capacitor D being provided between each of the selected two first electrodes and the second electrode to which the reference voltage is supplied, and

wherein the coordinate position calculating circuit calculates a touch point at which the touch panel is touched based on the selected two first electrodes and the capacitance difference (A-B), and based on the selected two second electrodes and the capacitance difference (C-D).

8. A display device with a touch panel according to claim 1, further comprising:

a first electrode selecting circuit;

a second electrode selecting circuit;

a detecting circuit; and

a coordinate position calculating circuit which calculates a touch point at which the touch panel is touched,

wherein, in a period A, the first electrode selecting circuit sequentially selects two first electrodes among the plurality of first electrodes to supply a positive pulse higher in potential than a reference voltage to one of the selected two first electrodes and supply a negative pulse lower in potential than the reference voltage to another thereof,

wherein, in a period B, the second electrode selecting circuit sequentially selects two second electrodes among the plurality of second electrodes to supply a positive pulse higher in potential than the reference voltage to one of the selected two second electrodes and supply a negative pulse lower in potential than the reference voltage to another thereof,

wherein, in the period A, the detecting circuit detects a capacitance difference between a capacitor A and a capacitor B (A-B), the capacitor A being provided between each of the selected two second electrodes and the first electrode to which the positive pulse is supplied, the capacitor B being provided between each of the selected two second electrodes and the first electrode to which the negative pulse is supplied, and in the period B, the detecting circuit detects a capacitance difference between a capacitor C and a capacitor D (C-D), the capacitor C being provided between each of the selected two first electrodes and the second electrode to which the positive pulse is supplied, the capacitor D being provided between each of the selected two first electrodes and the second electrode to which the negative pulse is supplied, and

wherein the coordinate position calculating circuit calculates a touch point at which the touch panel is touched based on the selected two first electrodes and the capacitance difference (A-B), and based on the selected two second electrodes and the capacitance difference (C-D).

9. A display device with a touch panel according to claim 1, wherein the display panel comprises an IPS liquid crystal display panel.

14. A display device with a touch panel according to claim 6, wherein the first substrate and the second substrate each comprise a plastic substrate.

10. A display device with a touch panel, comprising:

a display panel; and

a capacitive touch panel which is placed on an observer side of the display panel,

wherein the touch panel includes a first substrate and a second substrate which are arranged to face each other,

wherein the first substrate includes on a surface thereof, which is opposed to the second substrate a plurality of first electrodes which extend in a first direction and are arranged side by side in a second direction intersecting the first direction,

wherein the second substrate includes on a surface thereof, which is opposed to the first substrate a plurality of second electrodes which extend in the second direction to intersect the plurality of first electrodes and are arranged side by side in the first direction, and

wherein the display device includes a gel-like sheet interposed between the plurality of first electrodes and the plurality of second electrodes.

11. A display device with a touch panel according to claim 10, wherein the gel-like sheet has a hardness of 2 or more and 15 or less.

12. A display device with a touch panel according to claim 10,

wherein the first substrate and the second substrate each comprise a glass substrate, and

wherein the second substrate is thinner than the first substrate.

13. A display device with a touch panel according to claim 10,

wherein the first substrate comprises a glass substrate, and

wherein the second substrate comprises a plastic substrate.

15. A display device with a touch panel according to claim 10, further comprising:

a driving circuit;

a detecting circuit; and

a coordinate position calculating circuit which calculates a touch point at which the touch panel is touched,

wherein the driving circuit sequentially selects two first electrodes among the plurality of first electrodes to supply a voltage higher in potential than a reference voltage to one of the selected two first electrodes and supply the reference voltage to another thereof,

wherein the detecting circuit detects a capacitance difference between a capacitor A and a capacitor B (A-B), the capacitor A being provided between a second electrode that is selected among the plurality of second electrodes and the first electrode to which the voltage higher in potential is supplied, the capacitor B being provided between the selected second electrode and the first electrode to which the reference voltage is supplied, and

wherein the coordinate position calculating circuit calculates a touch point at which the touch panel is touched based on locations of the selected first electrodes and the selected second electrode and on the capacitance difference (A-B).

16. A display device with a touch panel according to claim 10, further comprising:

a driving circuit;

a detecting circuit; and

a coordinate position calculating circuit which calculates a touch point at which the touch panel is touched,

wherein, in a period A, the driving circuit sequentially selects two first electrodes among the plurality of first electrodes to supply a voltage higher in potential than a reference voltage to one of the selected two first electrodes and supply the reference voltage to another thereof and, in a period B, the driving circuit sequentially selects two second electrodes among the plurality of second electrodes to supply a voltage higher in potential than the reference voltage to one of the selected two second electrodes and supply the reference voltage to another thereof,

wherein, in the period A, the detecting circuit detects a capacitance difference between a capacitor A and a capacitor B (A-B), the capacitor A being provided between each of the selected two second electrodes and the first electrode to which the voltage higher in potential is supplied, the capacitor B being provided between the each of the selected two second electrodes and the first electrode to which the reference voltage is supplied, and in the period B, the detecting circuit detects a capacitance difference between a capacitor C and a capacitor D (C-D), the capacitance C being provided between each of the selected two first electrodes and the second electrode to which the voltage higher in potential is supplied, the capacitor D being provided between each of the selected two first electrodes and the second electrode to which the reference voltage is supplied, and

wherein the coordinate position calculating circuit calculates a touch point at which the touch panel is touched based on the selected two first electrodes and the capacitance difference (A-B), and based on the selected two second electrodes and the capacitance difference (C-D).

17. A display device with a touch panel according to claim 10, further comprising:

a first electrode selecting circuit;

a second electrode selecting circuit;

a detecting circuit; and

a coordinate position calculating circuit which calculates a touch point at which the touch panel is touched,

wherein, in a period A, the first electrode selecting circuit sequentially selects two first electrodes among the plurality of first electrodes to supply a positive pulse higher in potential than a reference voltage to one of the selected two first electrodes and supply a negative pulse lower in potential than the reference voltage to another thereof,

wherein, in a period B, the second electrode selecting circuit sequentially selects two second electrodes among the plurality of second electrodes to supply a positive pulse higher in potential than the reference voltage to one of the selected two second electrodes and supply a negative pulse lower in potential than the reference voltage to another thereof,

wherein, in the period A, the detecting circuit detects a capacitance difference between a capacitor A and a capacitor B (A-B), the capacitor A being provided between each of the selected two second electrodes and the first electrode to which the positive pulse is supplied, the capacitor B being provided between each of the selected two second electrodes and the first electrode to which the negative pulse is supplied, and in the period B, the detecting circuit detects a capacitance difference between a capacitor C and a capacitor D (C-D), the capacitor C being provided between each of the selected two first electrodes and the second electrode to which the positive pulse is supplied, the capacitor D between each of the selected two first electrodes and the second electrode to which the negative pulse is supplied, and

wherein the coordinate position calculating circuit calculates a touch point at which the touch panel is touched based on the selected two first electrodes and the capacitance difference (A-B), and based on the selected two second electrodes and the capacitance difference (C-D).

18. A display device with a touch panel according to claim 10, wherein the display panel comprises an IPS liquid crystal display panel.