Touch-sensitive device and method for driving the same

• US 9,996,183 B2
• Filed: 05/27/2014
• Issued: 06/12/2018
• Est. Priority Date: 12/13/2013
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Cheng, Hongfei, Zhang, Yuxin
• Primary Examiner(s): Ketema, Benyam
• Application Number:
  US14/423,962
• Publication Number:
  US 20160034091A1
• Time in Patent Office: 1,477 Days
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 2300/04 Structural and physical details of display devices
• CPC Class Codes: G09G 3/36 using liquid crystals
• CPC Class Codes: G09G 5/003 Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto specific for a CRT G09G1/165; for a flat panel G09G3/2092

Abstract

A touch-sensitive device comprises: a touch-sensing carrier panel; a driving signal line and a inductive signal line; a touch-sensitive circuit connected with the driving signal line and the inductive signal line; an array of first electrodes and an array of second electrodes located on the touch-sensing carrier panel; a first switch having an end connected to the array of the first electrodes and the other end connected to the corresponding driving signal line and the corresponding inductive signal line; and a second switch having an end connected to the array of the second electrodes and the other end connected to the corresponding driving signal line and the corresponding inductive signal line, wherein each of the first switch and the second switch is adapted to switch between a respective driving signal line and a respective inductive signal line such that the array of first electrodes is connected with one of the driving signal line and the inductive signal line and the array of second electrodes is connected with the other one of the driving signal line and the inductive signal line. The present disclosure also provides a method for driving the above touch-sensitive device. The present invention may perform the signal conversion by switches such that the first electrodes and the second electrodes are switched between the connections to the inductive signal lines and the connections to the driving signal lines by performing signal switching by switches, so as to achieve the double side touch sensing.

Claims

1. A touch-sensitive device comprising:

a touch-sensing carrier panel comprising a first substrate and a second substrate opposed to the first substrate;

a driving signal line and an inductive signal line;

a touch-sensitive circuit connected with the driving signal line and the inductive signal line;

an array of first electrodes and an array of second electrodes located on the touch-sensing carrier panel;

a first switch having a first end connected to the array of the first electrodes and a second end connected to the driving signal line and the inductive signal line;

a second switch having a first end connected to the array of the second electrodes and a second end connected to the driving signal line and the inductive signal line;

wherein each of the first switch and the second switch is adapted to switch between the driving signal line and the inductive signal line such that the array of first electrodes is connected with one of the driving signal line and the inductive signal line and the array of second electrodes is connected with the other one of the driving signal line and the inductive signal line, and

wherein at least one array of the array of the first electrodes and the array of the second electrodes is located between the first substrate and the second substrate.

2. The touch-sensitive device according to claim 1, comprising a plurality of the first switch and a plurality of the second switch, wherein

each row of the array of the first electrodes are connected to one first switch and each column of the array of the second electrodes are connected to one second switch;

or

each column of the array of the first electrodes are connected to one first switch and each row of the array of the second electrodes are connected to one second switch.

3. The touch-sensitive device according to claim 1, wherein

a region surrounded by two adjacent rows of the array of the first electrodes and two adjacent columns of the array of the second electrodes corresponds to N pixel units of the display panel;

or

a region surrounded by two adjacent columns of the array of the first electrodes and two adjacent rows of the array of the second electrodes corresponds to N pixel units of the display panel, and

wherein N is a natural number.

4. The touch-sensitive device according to claim 3, wherein N is in a range of 3˜

15.

5. A method for driving the touch-sensitive device of claim 1,

the method comprising the steps of:

defining a predetermined time period t as one touch sensing period in which the array of the first electrodes is applied with a driving signal and an inductive signal from the array of the second electrodes is detected for a predetermined time period t1 and then the array of the second electrodes is applied with the driving signal and the inductive signal from the array of the first electrodes is detected for a predetermined time period t2, and

cycling the touch sensing period to realize a double-side touch sensing, wherein t1+t2=t.

6. The method according to claim 5, wherein t1=t2.

7. The method according to claim 5, wherein when the touch-sensing carrier panel is a display panel and a time period for displaying a frame of a picture is T, a preceding part of the time period T is a display time slice T1 and a following part of the time period T is a touch sensing time slice T2, and wherein T1+T2=T, T1>

T2, T2=s×

t, and s is a number that is greater than or equal to 1.

8. A method for driving the touch-sensitive device according to claim 1, the method comprising the steps of:

manipulating the first switch to connect the array of the first electrodes to the driving signal line and manipulating the second switch to connect the array of the second electrodes to the inductive signal line; and

after a predetermined period, manipulating the first switch to connect the array of the first electrodes to the inductive signal line and manipulating the second switch to connect the array of the second electrodes to the driving signal line.

9. The touch-sensitive device according to claim 1, wherein the touch-sensing carrier panel is a display panel.

10. The touch-sensitive device according to claim 9, wherein the display panel comprises:

the first substrate and the second substrate opposed to the first substrate; and

liquid crystal between the first substrate and the second substrate,

wherein the array of the first electrodes and the array of the second electrodes are located in stacks on sides of the first substrate and the second substrate facing the liquid crystal respectively.

11. The touch-sensitive device according to claim 9, wherein the display panel comprises:

the first substrate and the second substrate opposed to the first substrate; and

liquid crystal between the first substrate and the second substrate,

wherein the array of the first electrodes is located in a stack on a side of the first substrate facing the liquid crystal and the array of the second electrodes is located on a side of the second substrate away from the first substrate.

12. The touch-sensitive device according to claim 9, wherein the display panel comprises:

the first substrate and the second substrate opposed to the first substrate; and

liquid crystal between the first substrate and the second substrate,

wherein the array of the first electrodes is located on a side of the first substrate away from the second substrate and the array of the second electrodes is located in a stack on a side of the second substrate facing the liquid crystal.