TOUCH DISPLAY SCREEN, METHOD FOR MANUFACTURING DISPLAY ELECTRODE OF THE TOUCH DISPLAY SCREEN, DISPLAY ELECTRODE AND ELECTRONIC DEVICE

• US 20140204287A1
• Filed: 07/15/2013
• Published: 07/24/2014
• Est. Priority Date: 01/18/2013
• Status: Active Grant

• Current Assignee: FocalTech Systems Co.,Ltd
• Original Assignee: FocalTech Systems Co.,Ltd
• Inventors: MO, Lianghua, LI, Hua, WANG, Peng, JIANG, Xinxi
• Granted Patent: US 9,069,205 B2
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/0443 using a single layer of sensing electrodes
• 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
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52

Abstract

A touch display screen, a method for manufacturing a display electrode of the touch display screen, a display electrode and an electronic device are described. In the touch display screen, the electrode in the first direction and the electrode in the second direction are connected to the touch detecting unit, and the touch detecting unit and the display control unit operate in a time-sharing manner. Thus, a part of the display electrode can be multiplexed, and it is unnecessary to provide an additional touch-sensitive layer to detect the touch on the touch display screen, so the structure of the touch display screen is simplified; because the touch-sensitive layer is omitted, the touch display screen has better transmittance; and because the touch detecting unit and the display control unit operate in a time-sharing manner, the detection on the touch and the control on the display will not affect mutually.

Claims

1. A touch display screen, comprising a cover plate, a color filter, a liquid crystal layer, a display electrode, a substrate and a backlight unit which are stacked sequentially from top to bottom, wherein:

the touch display screen further comprises a touch detecting unit and a display control unit;

the display electrode comprises an electrode in a first direction and an electrode in a second direction which intersects with the first direction;

the electrode in the first direction and the electrode in the second direction are connected to the touch detecting unit, the touch detecting unit is adapted to detect mutual capacitance formed between the electrode in the first direction and the electrode in the second direction, and determine a touch on the touch display screen based on the detected mutual capacitance;

the display electrode is further connected to the display control unit, the display control unit is adapted to control the display electrode to perform liquid crystal display; and

the display control unit and the touch detecting unit operate in a time-sharing manner.

2. The touch display screen according to claim 1, further comprising a control unit, which is connected to both the display control unit and the touch detecting unit for controlling the display control unit and the touch detecting unit to operate in the time-sharing manner.

3. The touch display screen according to claim 1, wherein:

the electrode in the first direction comprises a common electrode in an X-axis direction, and the electrode in the second direction comprises a signal electrode;

or

the electrode in the first direction comprises a switch electrode, and the electrode in the second direction comprises a common electrode in a Y-axis direction;

or

the electrode in the first direction comprises a common electrode in an X-axis direction, and the electrode in the second direction comprises a common electrode in a Y-axis direction.

4. The touch display screen according to claim 1, wherein:

a plurality of electrodes in the first direction are served collectively as one driving electrode which is adapted to be used when the touch detecting unit performs the touch detection, and a plurality of electrodes in the second direction are served collectively as one receiving electrode which is adapted to be used when the touch detecting unit performs the touch detection;

or

a plurality of electrodes in the first direction are served collectively as one receiving electrode which is adapted to be used when the touch detecting unit performs the touch detection, and a plurality of electrodes in the second direction are served collectively as one driving electrode which is adapted to be used when the touch detecting unit performs the touch detection.

8. The touch display screen according to claim 2, wherein:

the electrode in the first direction comprises a common electrode in an X-axis direction, and the electrode in the second direction comprises a signal electrode;

or

the electrode in the first direction comprises a switch electrode, and the electrode in the second direction comprises a common electrode in a Y-axis direction;

or

the electrode in the first direction comprises a common electrode in an X-axis direction, and the electrode in the second direction comprises a common electrode in a Y-axis direction.

9. The touch display screen according to claim 2, wherein:

a plurality of electrodes in the first direction are served collectively as one driving electrode which is adapted to be used when the touch detecting unit performs the touch detection, and a plurality of electrodes in the second direction are served collectively as one receiving electrode which is adapted to be used when the touch detecting unit performs the touch detection;

or

a plurality of electrodes in the first direction are served collectively as one receiving electrode which is adapted to be used when the touch detecting unit performs the touch detection, and a plurality of electrodes in the second direction are served collectively as one driving electrode which is adapted to be used when the touch detecting unit performs the touch detection.

5. An electronic device, comprising a touch display screen, the touch display screen comprising:

a cover plate, a color filter, a liquid crystal layer, a display electrode, a substrate and a backlight unit which are stacked sequentially from top to bottom, wherein;

the touch display screen further comprises a touch detecting unit and a display control unit;

the display electrode comprises an electrode in a first direction and an electrode in a second direction which intersects with the first direction;

the electrode in the first direction and the electrode in the second direction are connected to the touch detecting unit, the touch detecting unit is adapted to detect mutual capacitance formed between the electrode in the first direction and the electrode in the second direction, and determine a touch on the touch display screen based on the detected mutual capacitance;

the display electrode is further connected to the display control unit, the display control unit is adapted to control the display electrode to perform liquid crystal display; and

the display control unit and the touch detecting unit operate in a time-sharing manner.

6. A method for manufacturing a display electrode, comprising:

vacuum sputtering a layer of metal on a substrate of a touch display screen, patterning the layer of metal by lithography to form a switch electrode, and forming a first insulating layer on the switch electrode;

vacuum sputtering a layer of electrode material, and patterning the layer of electrode material by lithography to form a common electrode in an X-axis direction;

forming a Thin Film Transistor TFT by lithography, forming a second insulating layer on the TFT and the common electrode in the X-axis direction, and patterning the second insulating layer by lithography;

vacuum sputtering a layer of metal, and patterning the layer of metal by lithography to form a signal electrode and a drain in a way that the signal electrode and the drain are connected to two terminals of the TFT respectively via the patterned second insulating layer;

forming a third insulating layer on the signal electrode and the drain, and patterning the third insulating layer by lithography; and

vacuum sputtering a layer of electrode material, and patterning the layer of electrode material by lithography to form a common electrode in a Y-axis direction and a pixel electrode in a way that the pixel electrode is connected to the drain via the patterned third insulating layer.

7. A display electrode of a touch display screen, comprising a switch electrode, a pixel electrode, a Thin Film Transistor TFT, a signal electrode, a common electrode in an X-axis direction and a common electrode in a Y-axis direction, wherein:

a first insulating layer is stacked above the switch electrode, the TFT and the common electrode in the X-axis direction are stacked on the first insulating layer;

a second insulating layer is stacked above the TFT and the common electrode in the X-axis direction, the signal electrode and a drain are stacked on the second insulating layer, and the signal electrode and the drain are respectively connected to two terminals of the TFT by passing through the second insulating layer; and

a third insulating layer is stacked above the signal electrode and the drain, the pixel electrode is stacked on the third insulating layer, and the pixel electrode is connected to the drain by passing through the third insulating layer.