In-cell touch panel and trace layout thereof

• US 10,055,069 B2
• Filed: 10/16/2015
• Issued: 08/21/2018
• Est. Priority Date: 10/17/2014
• Status: Active Grant

• Current Assignee: Raydium Semiconductor Corporation
• Original Assignee: Raydium Semiconductor Corporation
• Inventors: Lee, Kun-Pei, Lin, Yi-Ying, Chiang, Chang-Ching
• Primary Examiner(s): Pham, Viet
• Application Number:
  US14/884,856
• Publication Number:
  US 20160109980A1
• Time in Patent Office: 1,040 Days
• 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: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• 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

An in-cell touch panel and its trace layout are disclosed. The in-cell touch panel includes a plurality of pixels. Each pixel has a laminated structure bottom-up including a substrate, a TFT layer, a liquid crystal layer, a color filter layer, and a glass layer. The TFT layer is disposed on the substrate. A first conductive layer and a second conductive layer are integrated in the TFT layer. The liquid crystal layer is disposed on the TFT layer. The color filter layer is disposed on the liquid crystal layer. The glass layer is disposed on the color filter layer. The design of touch sensing electrodes and their trace layout in the in-cell touch panel of the application is simple and it can effectively reduce cost and reduce the RC loading of a common electrode.

Claims

1. An in-cell touch panel, comprising:

a plurality of pixels, a laminated structure of each pixel comprising;

a substrate;

a thin-film transistor layer disposed above the substrate, a first conductive layer and a second conductive layer being integrated in the thin-film transistor layer;

a liquid crystal layer, disposed above the thin-film transistor layer;

a color filtering layer, disposed above the liquid crystal layer; and

a glass layer, disposed above the color filtering layer;

wherein the second conductive layer and a common electrode are formed simultaneously, but the second conductive layer and the common electrode are separated, and the first conductive layer is formed before the common electrode, the second conductive layer is formed above the first conductive layer and the second conductive layer is electrically connected with the first conductive layer to form a bridge structure.

2. The in-cell touch panel of claim 1, wherein the second conductive layer and a source electrode and a drain electrode of the thin-film transistor layer are formed simultaneously.

3. The in-cell touch panel of claim 1, wherein the second conductive layer and a gate electrode of the thin-film transistor layer are formed simultaneously.

4. The in-cell touch panel of claim 3, wherein the gate electrode of the thin-film transistor layer is arranged adjacent to another gate electrode.

5. The in-cell touch panel of claim 1, wherein the in-cell touch panel is an in-cell mutual capacitive touch panel and a driving electrode (TX) and a sensing electrode (RX) of the in-cell mutual capacitive touch panel are formed by the first conductive layer in a mesh type.

6. The in-cell touch panel of claim 5, wherein when the driving electrode (TX) and the sensing electrode (RX) formed by the first conductive layer cross each other, the second conductive layer is used as a bridge structure to electrically connect the driving electrode (TX) or electrically connect the sensing electrode (RX).

7. The in-cell touch panel of claim 5, wherein the first conductive layer further comprises a first connecting portion separated from the driving electrode (TX) and the sensing electrode (RX), and the first connecting portion is electrically connected with the common electrode.

8. The in-cell touch panel of claim 1, wherein the second conductive layer further comprises a second connecting portion electrically connected with the common electrode.

9. The in-cell touch panel of claim 1, wherein the color filtering layer further comprises a color filter and a black matrix resist and the black matrix resist has good light resistance, and the first conductive layer and the second conductive layer are disposed under the black matrix resist.

10. The in-cell touch panel of claim 1, wherein when the in-cell touch panel is operated in a touch mode, the common electrode is switched to a floating voltage level or provided a touch-related signal.

11. The in-cell touch panel of claim 1, wherein a touch mode and a display mode of the in-cell touch panel are driven in a time-sharing way, and the in-cell touch panel is operated in the touch mode during a blanking interval of a display period of the in-cell touch panel.

12. The in-cell touch panel of claim 11, wherein the blanking interval comprises at least one of a vertical blanking interval (VBI), a horizontal blanking interval (HBI), and a long horizontal blanking interval, the long horizontal blanking interval has a time length equal to or larger than that of the horizontal blanking interval, the long horizontal blanking interval is obtained by redistributing a plurality of the horizontal blanking interval or the long horizontal blanking interval comprises the vertical blanking interval.

13. An in-cell touch panel, comprising:

a plurality of pixels, a laminated structure of each pixel comprising;

a substrate;

a thin-film transistor layer disposed above the substrate, a first conductive layer and a second conductive layer being integrated in the thin-film transistor layer;

a liquid crystal layer, disposed above the thin-film transistor layer;

a color filtering layer, disposed above the liquid crystal layer; and

a glass layer, disposed above the color filtering layer;

wherein the in-cell touch panel is an in-cell mutual capacitive touch panel and a driving electrode (TX) and a sensing electrode (RX) of the in-cell mutual capacitive touch panel are formed by the first conductive layer in a mesh type.

14. An in-cell touch panel, comprising:

a plurality of pixels, a laminated structure of each pixel comprising;

a substrate;

a thin-film transistor layer disposed above the substrate, a first conductive layer and a second conductive layer being integrated in the thin-film transistor layer;

a liquid crystal layer, disposed above the thin-film transistor layer;

a color filtering layer, disposed above the liquid crystal layer; and

a glass layer, disposed above the color filtering layer;

wherein when the in-cell touch panel is operated in a touch mode, a common electrode is switched to a floating voltage level without being used as a touch electrode.