Display device

• US 20050184971A1
• Filed: 01/28/2005
• Published: 08/25/2005
• Est. Priority Date: 01/28/2004
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yasukawa, Sadahiko, Ogino, Akihisa
• Granted Patent: US 7,545,343 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A display device is equipped with a panel having a common electrode layer to which a voltage changing at a fixed frequency is applied and a tabular member which is arranged at a fixed gap from said panel. A voltage which is changed in synchronization with the change of a voltage which is applied to the common electrode layer is applied, and an electrode layer which is arranged so as to be nearly parallel to the fore-mentioned tabular member and the fore-mentioned panel is provided.

Claims

1. A display device, comprising a panel having a common electrode layer to which a voltage changing at a fixed frequency is applied and a tabular member which is arranged at a fixed gap from said panel,

an electrode layer which is arranged so as to be in nearly parallel to said tabular member and said panel is provided,

and a voltage which is changed in synchronization with the change of a voltage which is applied to said common electrode layer is applied to said electrode layer.

2. A display device according to claim 1,

wherein said tabular member is arranged between said electrode layer and said common electrode layer

and a voltage having the same phase as the change of a voltage applied to said common electrode layer is applied to this electrode layer.

3. A display device according to claim 2, further comprising a common electrode signal-generating circuit for applying a voltage to said common electrode layer and said electrode layer.

4. A display device according to claim 1,

wherein the voltage changed at a fixed frequency is applied to said common electrode layer and the voltage applied to said electrode layer is changed at a higher frequency than a frequency which the voltage applied to said common electrode layer has.

7. A display device according to claim 1,

wherein said tabular member is arranged at a fixed gap from said panel above the display face side of this panel.

8. A display device according to claim 7, further comprising a touch panel including a first electrode layer and a second electrode layer which is arranged so as to face said first electrode layer above the display face side of said panel than said first electrode layer,

wherein said electrode layer is at least one of said first electrode layer and said second electrode layer.

9. A display device according to claim 8,

further comprising a touch panel controller which detects electrical change generated between said first electrode layer and said second electrode layer by touching said touch panel by a user and detects a position at which this user touched and a switch means which switches electrical connection between said first electrode layer and/or said second electrode layer and the fore-mentioned touch panel controller to a conducted condition or an intercepted condition.

10. A display device according to claim 7,

further comprising a touch panel including a first electrode layer and a second electrode layer which is arranged so as to face said first electrode layer above the display face side of said panel than said first electrode layer,

wherein said electrode layer is a transparent electrode layer which was arranged between said first electrode layer and said common electrode layer.

11. A display device according to claim 7,

further comprising a touch panel including a first electrode layer and a second electrode layer which is arranged so as to face said first electrode layer above the display face side of said panel than said first electrode layer,

wherein said electrode layer is a transparent electrode layer which was arranged on the display face side of the touch panel.

12. A display device according to claim 7,

wherein said tabular member is the surface panel which is arranged on the display face side of said panel and said electrode layer is of a transparent electrode layer which was arranged at said surface panel.

13. A display device according to claim 7,

wherein said tabular member is one portion of members composing a front light which is arranged above the display face side of said panel and said electrode layer is of a transparent electrode layer which was arranged at said front light.

14. A display device according to claim 1,

wherein said electrode layer is provided at the panel having said common electrode layer.

15. A display device according to claim 14,

further comprising a backlight which is arranged above the opposite side of the display face of said panel and supplies light to this panel,

wherein said tabular member is one portion of a member composing this backlight,

and said electrode layer is the transparent electrode layer which is provided on the opposite side of the display face of said panel.

16. A display device according to claim 15,

wherein said panel comprising a first transparent substrate and a second transparent substrate which is arranged above the display face side than said first transparent substrate,

the said transparent electrode layer is formed on the opposite side of the display face of said first transparent substrate,

and a polarizing plate is bonded on the opposite side of the display face of said transparent electrode layer.

5. A display device, comprising a panel having a common electrode layer to which a voltage changing at a fixed frequency is applied and a tabular member which is arranged at a fixed gap from said panel,

wherein an electrode layer which is arranged so as to be in nearly parallel to said tabular member and said panel is provided

and a voltage generating electric field which changes the cycle of changing the electric field which is generated by applying a voltage changing at a fixed frequency to said common electrode layer is applied to said electrode layer.

6. A display device according to claim 5,

further comprising a common electrode signal-generating circuit for generating a voltage applied to said common electrode layer and a sound generation improving signal-generating circuit which carries out a fixed processing to a voltage which said common electrode signal-generating circuit generated, preparing sound generation improving signals and applying this sound generation improving signals to said electrode layer.

17. A display device according to claim 5,

wherein said tabular member is arranged at a fixed gap from said panel above the display face side of this panel.

18. A display device according to claim 5,

wherein said electrode layer is provided at the panel having said common electrode layer.