Display having touch sensing function

• US 9,423,641 B2
• Filed: 08/14/2013
• Issued: 08/23/2016
• Est. Priority Date: 01/02/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Mun, Sung Jin, Bang, Jung Suk, Jeong, Ki-Hun, Kim, Dae Cheol, Kim, Sung Ryul, Kim, Woong Kwon, Cho, Byeong Hoon, Han, Kun-Wook
• Primary Examiner(s): Nguyen, Dung
• Assistant Examiner(s): Liu, Shan
• Application Number:
  US13/967,239
• Publication Number:
  US 20140184942A1
• Time in Patent Office: 1,105 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means

Abstract

A panel for a display device is provided. The panel includes a first substrate, a touch sensing circuit formed on the first substrate, the touch sensing circuit including at least one sensing thin film transistor and a connection wire, and a shielding electrode formed covering at least a portion of the sensing thin film transistor and the connection wire.

Claims

1. A panel for a display device, comprising:

a first substrate;

a touch sensing circuit formed on the first substrate, the touch sensing circuit including at least one sensing thin film transistor and a connection wire;

a shielding electrode formed on the touch sensing circuit and covering at least a portion of the sensing thin film transistor and the connection wire,

a color filter and a black matrix disposed on the shielding electrode, and

a passivation layer formed between the touch sensing circuit and the shielding electrode,

wherein the passivation layer has a trench formed around the touch sensing circuit, and the shielding electrode is formed extending to a bottom of the trench.

2. The panel of claim 1, wherein the shielding electrode is formed having a first matrix shape corresponding to a shape of the black matrix.

3. The panel of claim 2, wherein a center portion of the shielding electrode is removed to form an opening, and the opening is formed having a second matrix shape.

4. The panel of claim 1, wherein

the trench is formed by removing a portion of one or more insulating layers between the first substrate and the shielding electrode, and the shielding electrode is formed in contact with the first substrate at the bottom of the trench.

5. The panel of claim 1, wherein

the passivation layer includes an inorganic insulating material.

6. The panel of claim 1, wherein

the passivation layer includes an organic insulating material.

7. The panel of claim 1, wherein

the passivation layer includes a first passivation layer formed of an inorganic insulating material and a second passivation layer formed of an organic insulating material.

8. The panel of claim 1, wherein the touch sensing circuit further comprises:

a switching thin film transistor connected to the sensing thin film transistor;

a sensing capacitor connected between an input terminal of the switching thin film transistor and an output terminal of the sensing thin film transistor; and

a sensing gate line for applying an on/off signal of the switching thin film transistor.

9. The panel of claim 1, wherein

a predetermined voltage is applied to the shielding electrode.

10. A liquid crystal display, comprising:

a first display panel including a first substrate, the first display panel including;

a touch sensing circuit formed on the first substrate, the touch sensing circuit including at least one sensing thin film transistor and a connection wire,

a shielding electrode formed on the touch sensing circuit and covering at least a portion of the sensing thin film transistor and the connection wire,

a color filter and a black matrix disposed on the shielding electrode, and

a passivation layer formed between the touch sensing circuit and the shielding electrode, wherein the passivation layer has a trench formed around the touch sensing circuit, and the shielding electrode is formed extending to a bottom of the trench, and

a second display panel including a second substrate facing the first substrate, the second display panel including a pixel electrode and an opposing electrode formed on the second substrate,

wherein a liquid crystal layer is disposed between the first display panel and the second display panel.

11. The liquid crystal display of claim 10, wherein

one of the pixel electrode and the opposing electrode is formed as a plate electrode, and the other one of the pixel electrode and the opposing electrode is formed as a linear electrode, wherein the linear electrode is formed overlapping with the plate electrode.

12. The liquid crystal display of claim 10, wherein

the trench is formed by removing a portion of one or more insulating layers between the first substrate and the shielding electrode, and the shielding electrode is formed in contact with the first substrate at the bottom of the trench.

13. The liquid crystal display of claim 10, wherein

the passivation layer includes an inorganic insulating material.

14. The liquid crystal display of claim 10, wherein

the passivation layer includes an organic insulating material.

15. The liquid crystal display of claim 10, wherein

the passivation layer includes a first passivation layer formed of an inorganic insulating material and a second passivation layer formed of an organic insulating material.

16. The liquid crystal display of claim 10, wherein a predetermined voltage is applied to the shielding electrode.