TWI623869B - Touch display device and touch signal processing method thereof - Google Patents

Abstract

The invention provides a touch display device and a touch signal processing method thereof. The touch display device includes a display area, a peripheral area, at least one wire, at least one touch sensing unit, and a processing unit. The display area has a plurality of scan lines and a plurality of data lines. The peripheral area is located on one side of the display area and has a gate driver and a source driver. At least one wire spans the scan line or the data line and generates at least one reference signal. Each touch sensing unit has a plurality of transmitting electrodes and a plurality of receiving electrodes for sensing a touch operation and outputting at least one touch sensing signal. The processing unit is electrically coupled to the touch sensing unit for receiving at least one touch sensing signal and outputting the control signal.

Description

Touch display device and touch signal processing method thereof

The present invention relates to a related art of a touch display device, and more particularly to a touch display device for improving touch accuracy and a touch signal processing method thereof.

In recent years, due to the reduced manufacturing cost of touch panels and the relatively intuitive human-machine interface of traditional input devices (eg, buttons, mice, trackballs, etc.), touch panels have gradually replaced traditional ones. Input device. The touch panel determines the touch position by the touch signal generated when the touch object (for example, a finger or a stylus) touches, but the touch signal is generated when the touch panel is touched. The signal changes, so the touch panel of the touch panel needs to avoid noise interference as much as possible to determine the touch position more accurately.

In addition, the touch panel usually forms a display touch panel with the liquid crystal display panel. When the touch panel is displayed on the display screen, noise is generated due to the switching of the display signal. These noises easily affect the touch signal, so that the display is displayed. The touch circuit of the touch panel has a problem of judging errors. Therefore, how to reduce the influence of noise and improve the accuracy of the touch circuit to detect the touch position is an important issue.

An object of the present invention is to provide a touch display device and a wire for sensing a noise generated when a touch display panel is displayed on a display screen, and processing the touch signal by using the sensed noise, thereby The touch signal contains part of the noise filtering, which makes the touch circuit detect the touch position more accurately.

Another object of the present invention is to provide a touch signal processing method for a touch display device.

The present invention provides a touch display device. The touch display device includes a display area, a peripheral area, at least one wire, at least one touch sensing unit, and a processing unit. The display area has a plurality of scan lines and a plurality of data lines, and the scan lines are respectively arranged alternately with the data lines to form a plurality of pixels arranged in an array. The peripheral region is disposed on one side of the display area, and has a gate driver and a source driver. The gate driver can be electrically coupled to the scan line, and the source driver can be electrically coupled to the data line. At least one wire spans the scan line or the data line and generates at least one reference signal. At least one touch sensing unit, each of the touch sensing units has a plurality of transmitting electrodes and a plurality of receiving electrodes for sensing a touch operation and outputting at least one touch sensing signal. The processing unit is electrically coupled to the sensing unit for receiving at least one touch sensing signal and outputting the control signal.

The present invention further provides a touch signal processing method for a touch display device. The touch display device includes a scan line, a data line, a touch sensing unit, at least one wire, at least one touch sensing signal receiving unit, and a processing unit. The processing unit includes a touch sensing signal receiving unit, a reference signal receiving unit, and a calculating unit. At least one wire spans the scan line or the data line, and generates at least one reference signal. The touch signal processing method includes the following steps: (a) After the touch sensing unit senses the touch operation, at least one touch sensing signal is outputted to the touch sensing signal receiving unit; (b) the touch sensing signal receiving unit outputs the control signal to the selection. The unit (c) selects at least one reference signal according to the control signal, and then outputs the selected at least one reference signal to the reference signal receiving unit; and (d) the computing unit receives the output of the touch sensing signal receiving unit. At least one touch sensing signal and at least one reference signal output by the reference signal receiving unit.

The touch display device of the present invention uses a metal wire to cross the scan line and the data line to sense the reference signal generated by the display signal switching when the liquid crystal display panel is displayed, and then the reference signal and the touch sensed by the metal wire. The touch sensing signal sensed by the sensing unit is input to the processing unit, and the processing unit may filter the portion of the touch sensing signal that includes the noise according to the reference signal, and output the processed touch sensing signal. Reducing the noise to affect the touch sensing signal and improving the accuracy of the touch circuit to detect the touch position.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

1 is a schematic diagram of a first embodiment of a touch display device according to the present invention. As shown in FIG. 1 , the present invention provides a touch display device 100. The touch display device 100 includes a display area and a periphery. The area, the at least one of the wires 141 and 142, and the at least one touch sensing unit 15 are the processing unit 16 and the selection unit 17. The display area is used for displaying a picture, and has a plurality of scanning lines 11 and a plurality of data lines 12. The peripheral area is disposed around the display area, and is provided with a related component such as a gate driver and a source driver. The gate driver can be electrically coupled to the scan line 11 respectively, and the source driver can be electrically coupled to the data line 12, respectively. And the scan lines 11 are respectively arranged alternately with the data lines 12 to form a plurality of pixels 13 arranged in an array. The wire 141 spans the scan line 11, and the wire 142 spans the data line 12 and produces reference signals Ref1, Ref2, respectively. The touch sensing unit 15 has a plurality of transmitting electrodes and a plurality of receiving electrodes. The touch sensing unit 15 is configured to sense a touch operation and output at least one touch sensing signal TSS. The processing unit 16 is electrically coupled to the touch sensing unit 15 for receiving at least one touch sensing signal TSS and outputting the control signal CTL according to the at least one touch sensing signal TSS. The selection unit 17 is electrically coupled to the wires 141 and 142 and the processing unit 16 for receiving the reference signals Ref1 and Ref2 and the control signal CTL. The selection unit 17 selects the reference signals Ref1 and Ref2 according to the control signal CTL, and selects the reference signals Ref1 and Ref2. The reference signals Ref1, Ref2 are output to the processing unit.

Referring to FIG. 2, FIG. 2 is a schematic diagram of a processing unit of the touch display device according to the present invention. As shown in FIG. 2, the processing unit 16 includes a touch sensing signal receiving unit 161, a reference signal receiving unit 162, and a computing unit. 163. The touch sensing signal receiving unit 161 is configured to receive the touch sensing signal TSS output by the touch sensing unit 15 and output the control signal CTL to the selecting unit 17 . The reference signal receiving unit 162 is configured to receive the reference signals Ref1 and Ref2 output by the selecting unit 17. The calculation unit 163 is configured to receive the touch sensing signal TSS output by the touch sensing signal receiving unit 161 and the reference signals Ref1 and Ref2 output by the reference signal receiving unit 162. The calculating unit 163 compares the reference signal Ref1 and Ref2 with the touch sensing signal TSS, and filters the portion of the touch sensing signal TSS including the reference signals Ref1 and Ref2, and then outputs the processed touch sensing signal TAR. The touch sensing signal TAR is used to determine the position where the touch occurs or the length of the touch.

Referring to FIG. 1 and FIG. 2 together, when the wire 141 spans the scan line 11 and the data line 12, as long as the voltage of the scan line 11 and the data line 12 changes, the wires 141 and 142 can generate the reference signal Ref1 by the capacitive coupling principle. Ref2, and the reference signals Ref1, Ref2 are transmitted to the selection unit 17. When the touch panel (finger or stylus) touches the touch panel, the touch sensing signal receiving unit 161 determines the position of the touch point according to the touch sensing signal TSS transmitted by the touch sensing unit 15. The nearest wire, and outputs the control signal CTL to the selection unit 17, so that the selection unit 17 inputs the reference signals Ref1, Ref2 generated by the nearest wire to the reference signal receiving unit 162. For example, if the touch position is closer to the wire 141, the touch sensing signal receiving unit 161 transmits the control signal CTL to the selecting unit 17, so that the selecting unit 17 selects the reference signal Ref1 sensed by the wire 141, and will refer to The signal Ref1 is transmitted to the reference signal receiving unit 162. The touch control position receiving unit 161 transmits the control signal CTL to the touch control signal receiving unit 161. The selecting unit 17 is configured such that the selecting unit 17 simultaneously selects the reference signals Ref1 and Ref2 and transmits the reference signals Ref1 and Ref2 to the reference signal receiving unit 162.

In the above embodiment, the structure in which the gate driver and the source driver are distributed on both sides of the panel is taken as an example. Therefore, in this embodiment, only two wires are required to be respectively spanned across the scan line set data line, but this is not used. Limiting the present invention, if the structure of the display touch panel is that the gate drivers are distributed on both sides of the panel and the source drivers are distributed on the third side of the panel, three wires are required to respectively cross the scan lines of the gate driver and the source drivers. Information line.

Referring to FIG. 3, FIG. 3 and FIG. 4, FIG. 3 is a schematic diagram of a touch display device according to a second embodiment of the present invention, and FIG. 4 is a schematic view of a third embodiment of the touch display device according to the present invention. The difference between FIG. 3 and FIG. 1 is that the wire 143 in the touch display device 200 of FIG. 3 is an L-shaped wire and spans the scan line 11 and the data line 12 to generate the reference signal Ref3, and then transmits the reference signal Ref3 to the processing unit. 16. Since only the wire 143 will only generate the reference signal Ref3, the selection unit 17 is not needed in this embodiment, and the reference signal Ref3 can be directly received by the reference signal receiving unit 162. Since the third embodiment is exemplified by an architecture in which the gate driver and the source driver are distributed on both sides of the panel, the wire of the third embodiment is the L-shaped wire 143, which is not intended to limit the present invention. As shown in FIG. 4, the difference between FIG. 4 and FIG. 3 is that if the structure of the touch panel 300 is that the gate drivers are distributed on both sides of the panel and the source drivers are distributed on the third side of the panel, a U-shaped is required. The wire 144 spans the scan line 11 of the gate driver and the data line 12 of the source driver and generates a reference signal Ref4.

5 is a schematic diagram of a fourth embodiment of a touch display device according to the present invention. FIG. 5 does not depict a source driver, a gate driver, a pixel 14, a scan line 11, a data line 12, and a touch sensing unit 15. For the components, only the wires 141-1, 141-2, 141-3, 142-1, 142-2, 142-3, the processing unit 16 and the selection unit 17 are drawn, but the operation of the present embodiment is not affected. The touch display device 400 of FIG. 4 has two wires respectively crossing the scan line 11 and the data line 12, and the two wires are divided into three segments 141-1, 141-2, 141-3, 142-1, 142-2. 142-3 are electrically coupled to the selection unit 17, respectively, and transmit the reference signals Ref11, Ref12, Ref13, Ref21, Ref22, Ref23 to the selection unit 17. When the touch component (the finger is taken as an example) touches the position P1, the touch sensing signal receiving unit determines the wire 141 closest to the touch point position according to the touch sensing signal transmitted by the touch sensing unit. 3, and the reference signal Ref13 generated by the wire 141-3 is used as the reference signal used by the computing unit and the touch sensing signal are compared with each other, and the related operations are the same as those in the above embodiment, and details are not described herein again. When the position P2 is touched, the touch sensing signal receiving unit determines the wire 142-2 closest to the touch point position, and uses the reference signal Ref22 generated by the wire 142-2 as the reference signal used by the calculating unit. The touch sensing signals are compared with each other. In this embodiment, the multi-touch can also be processed. For example, when the positions P1 and P2 are touched at the same time, the reference signals Ref13 and Ref22 are used as the reference signals and touches used by the calculating unit. The control signals are compared with each other. Since the present embodiment uses a shorter wire to cross the scan line and the data line, the wire can receive a more accurate reference signal, so that the portion of the touch sensing signal containing the reference signal can be more accurately filtered. The processed touch sensing signal.

FIG. 6 is a flowchart of a touch signal processing method of a touch display device according to an embodiment of the present invention. Referring to FIG. 6 , the method includes the following steps: when at least one touch sensing unit senses a touch operation Then, at least one touch sensing signal is outputted to the touch sensing signal receiving unit (as shown in step S51); then the touch sensing signal receiving unit outputs a control signal to the selecting unit (as shown in step S52); The selection unit selects at least one reference signal according to the control signal, and then outputs the selected at least one reference signal to the reference signal receiving unit (as shown in step S53); and the computing unit receives at least the output of the touch sensing signal receiving unit. a touch sensing signal and at least one reference signal output by the reference signal receiving unit (as shown in step S54); and the computing unit compares the at least one reference signal with the at least one touch sensing signal, and then outputs the processed touch The sensing signal is controlled (as shown in step S55).

In summary, since the present invention utilizes a wire to cross the scan line and the data line, the reference signal generated by the signal switching when the display circuit is displayed is sensed, and then the reference signal sensed by the wire and the touch sensing unit are detected. The sensed touch sensing signal is input to the processing unit, and the processing unit can filter the touch sensing signal containing the noise according to the reference signal, and output the processed touch sensing signal to reduce the miscellaneous The influence of the touch sensing signal enhances the accuracy of the touch circuit to detect the touch position accuracy.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Any one skilled in the art can make some modifications and retouchings without departing from the spirit and scope of the present invention. The scope is subject to the definition of the patent application scope.

100, 200, 300, 400‧‧‧ display touch circuits
11‧‧‧ scan line
12‧‧‧Information line
13‧‧‧ pixels
141, 142, 141-1, 141-2, 141-3, 142-1, 142-2, 142-3, 143, 144‧‧‧ wires
15‧‧‧Touch sensing unit
16‧‧‧Processing unit
161‧‧‧Touch sensing signal receiving unit
162‧‧‧Reference signal receiving unit
163‧‧‧Computation unit
17‧‧‧Selection unit
Ref1, Ref2, Ref3, Ref4, Ref11, Ref12, Ref13, Ref21, Ref22, Ref23‧‧‧ reference signals
CTL‧‧‧ control signal
TSS‧‧‧ touch sensing signal
Touch sensing signal after TAR‧‧‧ processing
P1, P2‧‧‧ position
S51~S55‧‧‧Steps

1 is a schematic diagram of a first embodiment of a touch display device according to the present invention; FIG. 2 is a schematic diagram of a processing unit of a touch display device according to the present invention; and FIG. 3 is a second embodiment of the touch display device according to the present invention. 4 is a schematic view of a third embodiment of a touch display device according to the present invention; FIG. 5 is a schematic view of a fourth embodiment of the touch display device according to the present invention; and FIG. 6 is a touch of an embodiment of the present invention. A flowchart of a touch signal processing method for controlling a display device.

Claims (8)

A touch display device includes: a display area having at least one scan line and at least one data line, wherein the at least one scan line is respectively interlaced with the at least one data line, and at least one scan line and at least one data line Forming at least one pixel in the interlaced portion; a peripheral region disposed on one side of the display region, having a gate driver and a source driver, the gate driver being electrically coupled to the at least one scan line, respectively The source driver is electrically coupled to the at least one data line; the at least one wire spans the at least one scan line or the at least one data line, and generates at least one reference signal; at least one touch sensing unit, each The at least one touch sensing unit has a plurality of transmitting electrodes and a plurality of receiving electrodes for sensing a touch operation and outputting at least one touch sensing signal; and a processing unit electrically coupling the touch senses The measuring unit is configured to receive the at least one touch sensing signal and output a control signal. The touch display device of claim 1, wherein the processing unit comprises: a selection unit electrically coupled to the at least one wire and the processing unit for receiving the at least one reference signal and the control signal The selection unit selects the at least one reference signal according to the control signal, and outputs the selected at least one reference signal to the processing unit. The touch display device of claim 2, wherein the processing unit comprises: a touch sensing signal receiving unit for receiving the at least one touch sensing signal and outputting the control signal to the selecting unit; a reference signal receiving unit for receiving the at least one reference signal output by the selecting unit; And the computing unit is configured to receive the at least one touch sensing signal output by the touch sensing signal receiving unit and the at least one reference signal output by the reference signal receiving unit, wherein the calculating unit utilizes the at least one reference The signal is compared with the at least one touch sensing signal, and then the processed touch sensing signal is output. The touch display device of claim 3, wherein the touch sensing signal receiving unit determines the wire closest to the touch point position according to the position of the touch point, and outputs the control signal to the selecting unit. The selection unit causes the reference signal generated by the nearest wire to be input to the reference signal receiving unit. The touch display device of claim 1, wherein the at least one wire is an L-shaped wire or a U-shaped wire, located in the peripheral region and spanning the at least one scan line and the at least one data line to generate A reference signal. A touch signal display device includes at least one scan line, at least one data line, at least one touch sensing unit, at least one wire, a touch sensing signal receiving unit, and a touch sensing device a selection unit and a processing unit, the processing unit includes a touch sensing signal receiving unit, a reference signal receiving unit, and a computing unit, the at least one wire spanning the at least one scan line or the at least one data line, and generating The at least one reference signal processing method includes the following steps: (a) after the at least one touch sensing unit senses the touch operation, outputting at least one touch sensing signal to the touch sensing a signal receiving unit; (b) the touch sensing signal receiving unit outputs a control signal to the selecting unit; (c) the selection unit selects the at least one reference signal according to the control signal, and then outputs the selected at least one reference signal to the reference signal receiving unit; and (d) the computing unit receives the touch sensing The at least one touch sensing signal output by the signal receiving unit and the at least one reference signal output by the reference signal receiving unit. The touch signal processing method of claim 6 further includes the step (e): the calculating unit compares the at least one reference signal with the at least one touch sensing signal, and then outputs the processed touch Sensing signal. The touch signal processing method of claim 6, wherein the touch sensing signal receiving unit determines the wire closest to the touch point position according to the touch point position, and outputs the control signal to the selecting unit. So that the selection unit inputs the reference signal generated by the nearest wire to the reference signal receiving unit.