TWI417860B - Touch panel and touch display device - Google Patents

Description

Touch display panel and touch display device

The present invention relates to a touch display panel and a touch display device using the touch display panel.

With the rapid development of flat panel display technology and the decreasing manufacturing cost, flat panel display devices with low radiation, small thickness and low power consumption are increasingly favored by consumers, so they are widely used in electronic products, such as Digital cameras, mobile phones, etc. Generally, a flat panel display device mainly includes a plasma display device (PDP), a liquid crystal display device (LCD), an organic electroluminescent diode display device (OLED), and the like. Among them, the liquid crystal display device has gradually become the mainstream flat display device on the market due to its relatively low cost.

In order to meet the needs of modern people for a more convenient and more intuitive human-machine interface, various flat panel display devices with touch functions, namely touch display devices, have been gradually introduced in the market in recent years. The touch display device can be generally divided into an external type and an in-line type. The in-cell touch display device directly forms the touch sensing component in the liquid crystal display panel, thereby realizing integration of the touch panel and the liquid crystal display panel. On the one hand, the in-cell touch display device can reduce the overall thickness of the touch display device, and on the other hand, the manufacturing cost can be reduced because no additional process steps are required in the manufacturing process.

During the operation of the in-cell touch display device, the user can perform various operations by clicking on the displayed screen. Specifically, when the user touches a certain position of the display screen by a finger or a stylus, the embedded touch sensing component corresponding to the position can detect and respond to the touch action of the user, and provide a Inductive signal to the external control circuit. The control circuit may further determine a location indicated by the touch action of the user according to the sensing signal, thereby obtaining an operation performed by the user, and providing a corresponding control signal to control the touch display device. Or use the electronic products of the touch display device to perform corresponding operations.

However, in the existing in-cell touch display device, since the touch sensing element is directly fabricated inside the liquid crystal display panel, it is affected by factors such as parasitic components (such as parasitic capacitance) and external ambient temperature of the liquid crystal display panel. The sensing signal provided by the touch sensing component is susceptible to interference, which may cause the external control circuit to accurately determine the location indicated by the user's touch action, and further cause the touch display device and related Electronic products have malfunctioned. Therefore, the stability and reliability of the in-cell touch display device in the prior art are low.

In view of this, it is necessary to provide a touch display panel and a touch display device with high stability and high reliability.

The touch display panel of the present invention includes a plurality of touch sensing units, each touch sensing unit is composed of a plurality of pixel units, each touch sensing unit includes a touch sensing element and a coupled sensing element. The component and the coupled sensing component are respectively disposed on different pixel units, and the two are respectively used to touch the touch sensing line inside the touch display panel to the external signal processing circuit when the touch sensing unit is applied by an external force. A touch sensing signal and a coupling signal are provided to enable the external signal circuit to filter out the interference signal in the touch sensing signal according to the coupling signal.

Another touch display device of the present invention includes a touch display panel having a plurality of touch sensing units and a signal processing circuit. The touch display panel includes a first substrate and a second substrate. The first substrate There is a common electrode layer. Each of the touch sensing units includes a touch sensing component for outputting a touch sensing signal and a coupling sensing component for outputting a coupling signal. The signal processing circuit is configured to process the touch sensing signal and the coupling signal. . The touch sensing element includes a first switching element disposed on the second substrate and a protrusion disposed on the first substrate and covered by the common electrode layer. The touch sensing element is covered by an external force. The common electrode layer on the surface abuts the second substrate and turns on the first switching element to output the touch sensing signal; the coupling sensing element includes a The second switching element of the second substrate, when the coupling sensing element is subjected to an external force, does not conduct the second switching element to the common electrode layer.

Compared with the prior art, the touch display panel and the touch display device provided by the touch sensing unit and the coupled sensing unit are similarly arranged in each touch sensing unit, and are processed by the signal. The circuit processes the touch sensing signal outputted by the touch sensing unit according to the coupling signal provided by the coupling sensing unit, so as to filter out the interference signal mixed in the touch sensing signal. Therefore, according to the processed touch sensing signal, the control circuit can accurately determine the position pointed by the touch action applied by the user, and control the touch display device according to the position or use the touch display device. The electronic product performs corresponding operations, thereby reducing the probability of malfunction of the touch display device and related electronic products, and improving the stability and reliability of the touch display device and related electronic products.

Compared with the prior art, the touch sensing device of the present invention provides a protrusion of the touch sensing element under the external force, so that the common electrode layer covering the surface thereof abuts the second substrate and turns on the first The switching element outputs the touch sensing signal; when the coupling sensing element is subjected to an external force, the second switching element does not conduct with the common electrode layer, and the coupling signal is directly output. The signal processing circuit can filter out the interference signal embedded in the touch sensing signal by processing the touch sensing signal and the coupling signal, thereby accurately determining the position of the external force and reducing the touch display device and related electrons. The probability of malfunction of the product improves the stability and reliability of the touch display device and related electronic products.

Please refer to FIG. 1 , which is a schematic structural diagram of an embodiment of a touch display device according to the present invention. The touch display device 100 is an in-cell touch display device, and includes a touch display panel 110, a scan driving circuit 120, a data driving circuit 130, a signal processing circuit 140, and a control circuit 150.

The touch display panel 110 can be a liquid crystal display panel, which includes m+1 Scan lines G0~Gm arranged in parallel, n data lines D1~Dn parallel to each other and perpendicular to the scan lines G0~Gm, and m×n defined by the scan lines G1~Gm and data lines D1~Dn A pixel unit Pij (which i, j respectively indicates that the pixel unit is located in the i-th column and the j-th column of the matrix, 1≦i≦m, 1≦j≦n).

Each pixel unit Pij includes a thin film transistor 111 and a pixel electrode 112, respectively. The gate of the thin film transistor 111 is connected to the scan driving circuit 120 through its corresponding scan line Gi (1≦i≦m), and the source thereof is connected through its corresponding data line Dj(1≦j≦n). To the data driving circuit 130, and its drain is connected to the pixel electrode 112. Moreover, the touch display panel 110 further includes a common electrode layer (not shown) having a plurality of common electrodes, each common electrode corresponding to one pixel unit, and in each pixel unit, the pixel electrode 112 The common electrode and the liquid crystal layer sandwiched therebetween form a liquid crystal capacitor.

In the touch display panel 110, the m×n pixel units distributed in a matrix may be divided into a plurality of touch sensing units 119. In this embodiment, as shown in FIG. 1 , the p×q pixel units can form a touch sensing unit 119, where p=3 and q=2, that is, each touch sensing unit 119 includes 3×2. Pixel unit. Moreover, the 3×2 pixel units can be divided into a first sensing sub-unit and a second sensing sub-unit located in adjacent columns, and each sensing sub-unit includes 3×1 pixel units, respectively, and the 3× One pixel unit is a red (R), green (G), and blue (B) pixel unit. The first sensing sub-unit can be used to provide a touch to the signal processing circuit 140 when the user applies a touch action to the touch display device (ie, when the touch sensing unit 130 is subjected to an external force). The second sensing sub-unit can be used to provide a coupling signal to the signal processing circuit 140. It should be understood that the above structure is only one embodiment of the present invention. In other alternative embodiments, p and q may also take other values, and those skilled in the art may know from the content of the present specification that when p and q take other values, The structure of the touch display panel 110 needs to be adjusted accordingly.

For convenience of description, it is assumed that the first sensing sub-unit and the second sensing sub-unit are located in the i-th column and the i-th column, respectively. Each of the touch sensing units 119 includes a touch sensing component 108 and a coupling sensing component 109 respectively disposed on the first sensing subunit located in the i-th column and the first in the i+1th column. Two sensing subunits. The touch sensing element 108 is connected to the i-th scan line Gi-1, the coupling sensing element 109 is connected to the i-th scanning line Gi, and the touch sensing element 108 and the coupling sensing element 109 are both passed. The same touch sensing line 114 is connected to the signal processing circuit 140.

Please refer to FIG. 2 , which is a partial side view of the touch sensing unit 119 in the touch display panel 110 . In each touch sensing unit 119, the touch sensing element 108 includes a protrusion 121 disposed on a color filter (CF) substrate and covered by the common electrode layer, and a thin film transistor (Thin). a film transistor, a TFT substrate, and a touch electrode 122 opposite to the protrusion 121 and a first switching element 123. The first switching element 123 has a control end, and the control end determines whether the first switching element 123 is turned on or off according to whether the touch sensing unit 119 is touched by a user.

Specifically, in the embodiment, the first switching element 123 may have a thin film transistor structure, and the gate of the thin film transistor serves as the control end, extending to the touch electrode 122 and the touch electrode In contact, the source is connected to the scan line Gi-1, and the drain is connected to the touch sensing line 114. When the external force acts on the touch sensing unit 119, the protrusion 121 can abut the common electrode layer covering the surface of the touch electrode 122 under the external force, so that the common electrode layer carries the common A voltage is applied to the gate of the first switching element 123 to turn on the first switching element 123. At this time, the first switching element 123 can receive the scanning signal from the scan line Gi-1 from the source thereof. The touch sensing signal is provided to the signal processing circuit 140 through the touch sensing line 114.

The structure of the coupling sensing component 109 is opposite to the touch sensing component 108. Specifically, the structure of the coupling sensing element 109 is the same as that of the touch sensing unit 119 on the side of the thin film transistor substrate, and the color filter of the coupling sensing element 109 is compared with the touch sensing unit 119. The side of the light-film substrate does not include the protrusions of the above-mentioned action, that is, when the coupling-inducting element 109 is subjected to an external force, it is not directly electrically connected to the common electrode layer. The coupling sensing element 109 includes an electrode 124 and a second switching element 125 having a thin film transistor structure, and the gate, the source and the drain of the second switching element 125 and the electrode 124, the scan line Gi and The touch sensing lines 114 are connected.

Referring to FIG. 3 together, the signal processing circuit 140 includes a complex signal processing unit 141. Each of the signal processing units 141 corresponds to a column of touch sensing units 119 and is connected to the touch sensing line 114 corresponding to the column touch sensing unit 119 for transmitting signals through the corresponding touch sensing lines 114. Process it. Specifically, the signal processing unit 141 includes a first controlled switch 142, a second controlled switch 143, a first signal storage unit 144, a second signal storage unit 145, and a comparison circuit 146. The first controlled switch 142 is connected to the touch sensing line 114 at one end, and the other end is connected to the comparing circuit 146 through the first signal storage unit 144; one end of the second controlled switch 143 is also connected to the touch sensing The other end is connected to the comparison circuit 146 via the second signal storage unit 145. The first controlled switch 142 and the second controlled switch 143 can be turned on under the internal timing control of the touch display device, that is, only one of the two is closed at the same time. In addition, in a specific embodiment, the comparison circuit 146 can include a comparator of a differential amplifier structure having a non-inverting input, an inverting input, and an output. The first signal storage unit 144 and the second signal storage unit 145 are respectively connected to the non-inverting input terminal and the inverting input terminal, and the output terminal is connected to the control circuit 150. The structure of the first signal storage unit 144 and the second signal storage unit 145 may be the same, and both may include a storage capacitor 147 and a switch 148 connected in parallel.

The working process of the touch sensing device provided in this embodiment is described below. When the touch sensing device is in operation, the scan driving circuit 120 provides scan signals and sequentially applies the scan signals to the scan lines G0 G Gm. When the k-th scan lines receive the scan signals, the touch display panel 110 is the k-th. The thin film transistor 111 of the column pixel unit is turned on. At this time, the data driving circuit 130 supplies the data signal to the kth column pixel unit through the corresponding data lines D1 to Dn and the thin film transistor 111, respectively. The touch display panel 110 displays a corresponding screen.

When a user performs a touch operation on the touch display device by a finger or a stylus or the like to perform an operation, the touch corresponding to the position pointed by the touch action (hereinafter referred to as the touch position) The sensing unit 119 will receive an external force generated by the touch action. In this case, the protrusion 121 in the touch sensing element 108 is caused by the external force so that the common electrode layer covering the surface thereof abuts to the touch. The electrode 122 is controlled such that a common voltage carried on the common electrode layer is applied to the gate of the first switching element 123, thereby causing the first switching element 123 to be turned on.

When the scan line Gi-1 connected to the touch sensing unit 119 receives the scan signal, the first switch component 123 uses the scan signal as a touch sensing signal and outputs the signal to the signal through the touch sensing line 114. Corresponding signal processing unit 141 in circuit 140. On the other hand, through the timing control, when the scan line Gi-1 receives the scan signal, the first controlled switch 142 in the signal processing unit 141 is closed, and the second controlled switch 143 is turned off, so the touch sensing The signal is sent to the storage capacitor 147 in the first signal storage unit 144 through the first controlled switch 142 for storage. The touch sensing signal received by the signal processing unit 141 may be interspersed with other interference signals due to the coupling of the parasitic elements inside the touch display device and the external environment temperature.

When the next scanning line Gi receives the scanning signal, the first controlled switch 142 of the signal processing unit 141 is turned off, and the second controlled switch 143 is closed; at this time, the coupling sensing unit 109 is received by the touch display device. It A coupling signal is output to the signal processing unit 141 by the coupling of the parasitic element and the external ambient temperature. The coupling signal is further sent to the storage capacitor 147 in the second signal storage unit 145 through the second controlled switch 143 for storage. Since the coupling sensing unit 109 is disposed adjacent to the touch sensing unit 108, and the structures of the two are similar, the coupling signal is substantially the same as the interference signal embedded in the touch sensing signal. After the touch sensing signal and the coupling signal are stored in the corresponding signal storage units 144 and 145, the comparison circuit 146 simultaneously reads the touch sensing signal from the first signal storage unit 144 and the second signal storage unit 145. And coupling the signal, and comparing the two, the touch sensing signal is processed according to the coupling signal to filter the interference signal from the touch sensing signal.

Further, the comparison circuit 146 can output the touch sensing signal processed by the signal processing unit 141 to the control circuit 150 for the control circuit 150 to determine the coordinates of the touch position. The control circuit 150 can learn the specific content of the operation performed by the user according to the determined coordinates, and provide a corresponding control signal to control the touch display device or use the electronic product of the touch display device to perform corresponding operations.

Compared with the touch display device of the prior art, the touch display device provided by the above-mentioned embodiments of the present invention simultaneously sets the touch sensing unit with a similar structure in each touch sensing unit 119 of the touch display panel 110. 108 and the coupling sensing unit 109, and the touch sensing signal outputted by the touch sensing unit 108 is processed by the signal processing circuit 140 according to the coupling signal provided by the coupling sensing unit 109, thereby filtering out the inclusions in the touch Interference signal in the sensing signal. Therefore, the control circuit 150 can accurately determine the position pointed by the touch action applied by the user, and control the touch display device according to the position or use the touch display device according to the processed touch sensing signal. The electronic product performs corresponding operations, thereby reducing the probability of malfunction of the touch display device and related electronic products, and improving the stability of the touch display device and related electronic products. Sex and reliability.

4 and FIG. 5, FIG. 4 is a schematic structural diagram of another embodiment of the touch display device of the present invention, and FIG. 5 is a circuit structure of a signal processing unit in the signal processing circuit of the touch display device of FIG. schematic diagram. The touch display device 200 is similar to the touch display device 100 provided in the previous embodiment, but the difference between the two is different in the structure of the touch display panel. Specifically, in the touch display panel 210 of the touch display device 200, the touch sensing element 208 and the coupling sensing element 209 of each touch sensing unit 219 are respectively disposed in the same column of pixel units and connected to the same A scanning line 203 is connected to the signal processing circuit 240 via a first touch sensing line 214. The coupling sensing element 209 is connected to the signal processing circuit 240 via a second touch sensing line 214. The first touch sensing line 214 is connected to the comparison circuit 246 through the first controlled switch 242 of the signal processing unit 241; the second touch sensing line 214 is connected to the comparison circuit through the second controlled switch 243 of the signal processing unit 241. 246.

With the above-mentioned structure, if the user applies a touch action to the touch display device 200, the touch sensing element 208 and the coupling sensing element 209 can simultaneously provide touch when the scan line Gi receives the scan signal. Controlling the sensing signal and the coupling signal to the signal processing circuit, the signal processing circuit can further process the touch sensing signal according to the coupling signal to filter out the interference signal mixed in the touch sensing signal, thereby ensuring the touch The stability and reliability of the display device 200 are controlled.

However, the present invention may have other various modifications. For example, the touch sensing element may be composed of the protrusion 121, the touch electrode 122, and a first switching element 123, which may be formed by a photoelectric film transistor. The photosensitive touch sensing component; when the first switching component 123 and the second switching component 125 are the top gate type thin film transistors with the gate in the uppermost layer, the touch sensing component 108 may not include the touch The electrode 122, the coupling sensing element 109 may not include the electrode 124, and the protrusion 121 is caused by the external force so that the common electrode layer covering the surface thereof abuts to the first switch The gate of element 123.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. All should be covered by the following patent application.

100‧‧‧Touch display device

110‧‧‧Touch display panel

120‧‧‧Scan drive circuit

130‧‧‧Data Drive Circuit

140‧‧‧Signal Processing Circuit

150‧‧‧Control circuit

110‧‧‧film transistor

112‧‧‧ pixel electrodes

114‧‧‧Touch sensing line

119‧‧‧Touch sensing unit

108‧‧‧Touch sensing components

109‧‧‧ Coupled sensing elements

141‧‧‧Signal Processing Unit

G0~Gm‧‧‧ scan line

D1~Dn‧‧‧ data line

121‧‧‧Protrusion

122‧‧‧Touch electrode

123‧‧‧First switching element

124‧‧‧Electrode

125‧‧‧Second switching element

142‧‧‧First controlled switch

143‧‧‧Second controlled switch

144‧‧‧First signal storage unit

145‧‧‧second signal storage unit

146‧‧‧Comparative circuit

FIG. 1 is a schematic structural view of an embodiment of a touch display device according to the present invention.

2 is a partial side view showing the touch sensing unit of the touch display panel of the touch display device of FIG. 1 .

3 is a schematic diagram showing the circuit structure of a signal processing unit in the signal processing circuit of the touch display device shown in FIG. 1.

4 is a schematic structural view of another embodiment of a touch display device according to the present invention.

FIG. 5 is a schematic diagram showing the circuit structure of a signal processing unit in the signal processing circuit of the touch display device shown in FIG.

100‧‧‧Touch display device

110‧‧‧Touch display panel

120‧‧‧Scan drive circuit

130‧‧‧Data Drive Circuit

140‧‧‧Signal Processing Circuit

150‧‧‧Control circuit

111‧‧‧film transistor

112‧‧‧ pixel electrodes

114‧‧‧Touch sensing line

119‧‧‧Touch sensing unit

108‧‧‧Touch sensing components

109‧‧‧ Coupled sensing elements

141‧‧‧Signal Processing Unit

G0~Gm‧‧‧ scan line

D1~Dn‧‧‧ data line

Claims (14)

A touch display device includes a touch display panel having a plurality of touch sensing units and a signal processing circuit. Each touch sensing unit includes a touch sensing component and a coupled sensing component, and the touch sensing component and the touch sensing component The coupled sensing component is connected to the signal processing circuit through a touch sensing line, wherein the touch sensing component is configured to provide a touch sensing signal to the signal processing circuit when the touch sensing unit is touched. The component is configured to provide a coupling signal to the signal processing circuit, and the signal processing circuit is configured to process the touch sensing signal according to the coupling signal to filter out the interference signal in the touch sensing signal. The touch display device of claim 1, wherein the signal processing circuit comprises a plurality of signal processing units, each of the signal processing units respectively corresponding to a column of touch sensing units, and connected to the signal sensing line through the signal sensing line The column touch sensing unit and the coupled sensing element. The touch display device of claim 2, wherein the signal processing unit comprises a comparison circuit, wherein the non-inverting input of the comparison circuit is configured to receive the touch sensing signal, and the inverting input terminal is configured to receive The coupling signal. The touch display device of claim 3, wherein the signal processing unit further includes a first signal storage unit and a second signal storage unit, wherein the first signal storage unit is coupled to the in-phase of the comparison circuit The input end is connected to the touch sensing element through a first controlled switch, the second signal storage unit is connected to the inverting input end of the comparison circuit, and is connected to the coupled sensing element through a second controlled switch . The touch display device of claim 4, wherein the first signal storage unit and the second signal storage unit each comprise a storage capacitor and a switch connected in parallel with each other. The touch display device of claim 1, wherein the touch display panel further comprises a plurality of scan lines, the touch sensing element comprises a touch electrode and a first switching element, the first switching element Connected in Between the corresponding scan line and the touch sensing line, and the control end thereof is connected to the touch electrode. The touch display device of claim 6, wherein the touch display device further comprises a color filter substrate and a thin film transistor substrate, the color filter substrate having a common electrode layer, the touch The control sensing element further includes a protrusion disposed on the color filter substrate and covered by the common electrode layer, the touch electrode and the first switching element being disposed on the thin film transistor substrate and opposed to the protrusion, the protrusion acting on an external force The common electrode layer covering the surface thereof is abutted to the touch electrode, and the coupling sensing element includes a second switching element and an electrode connected to the control end of the second switching element. When the coupled inductive element is subjected to an external force, the electrode and the second switching element are not directly electrically connected to the common electrode layer. The touch display device of claim 1, wherein each touch sensing unit comprises a first sensing subunit and a second sensing subunit, and the first sensing subunit and the second sensing The sub-units respectively comprise three pixel units of red, green and blue, wherein the touch sensing element is disposed in one of three pixel units of red, green and blue of the first sensing subunit, and the coupling sensing element is disposed at One of the three pixel units of red, green and blue of the second sensing subunit. The touch display device of claim 1, wherein each touch sensing unit comprises a first sensing subunit and a second sensing subunit, and the first sensing subunit and the second sensing The sub-units respectively include three pixel units of red, green and blue, wherein the touch sensing element and the coupling sensing element are respectively disposed in two of the three pixel units of red, green and blue of the first sensing subunit. in. The touch display device of claim 8 or 9, wherein the first sensing sub-unit and the second sensing sub-unit are located in adjacent columns. A touch display panel includes a plurality of touch sensing units, each touch sensing unit is composed of a plurality of pixel units, and each touch sensing unit includes The touch sensing component and the coupling sensing component are respectively disposed in different pixel units, and the touch sensing component and the coupling sensing component are respectively used in the touch sensing The external sensing device provides a touch sensing signal and a coupling signal to the external signal processing circuit by touching the touch sensing line inside the touch display panel, so that the external signal circuit filters the touch according to the coupled signal. Interference signal in the sensing signal. The touch display panel of claim 11, wherein the touch display panel further comprises a color filter substrate and a thin film transistor substrate, the color filter substrate having a common electrode layer, the touch The control sensing element comprises a first switching element disposed on the thin film transistor substrate, a touch electrode connected to the control end of the first switching element, and a photo filter substrate disposed on the color filter substrate and covered by the common electrode layer. a protrusion, the touch electrode and the first switching element are disposed on the thin film transistor substrate and opposite to the protrusion, and the protrusion can abut the common electrode layer covering the surface to the touch electrode by an external force, The coupling sensing element includes a second switching element disposed on the thin film transistor substrate and an electrode electrically connected to a control end of the second switching element. When the coupling sensing element is subjected to an external force, the electrode and the second switching element It will not be directly connected to the common electrode layer. A touch display device includes a touch display panel having a plurality of touch sensing units and a signal processing circuit, the touch display panel including a first substrate and a second substrate, the first substrate having a common electrode layer Each touch sensing unit includes a touch sensing component for outputting a touch sensing signal and a coupling sensing component for outputting a coupling signal, wherein the signal processing circuit is configured to process the touch sensing signal and the coupling The touch sensing element includes a first switching element disposed on the second substrate and a protrusion disposed on the first substrate and covered by the common electrode layer. The touch sensing element is protruded by an external force. a common electrode layer covering the surface thereof abuts to the second substrate and turns on the first opening Turning off the component and outputting the touch sensing signal; the coupling sensing component includes a second switching component disposed on the second substrate, and the second switching component is not conductive to the common electrode layer when the coupling sensing component is subjected to an external force . The touch display device of claim 13 , wherein the touch sensing component further includes a touch electrode disposed on the second substrate, the touch electrode being coupled to the first switch of the touch sensing component a control end of the component, the protrusion of the touch sensing element is caused by an external force to abut the common electrode layer covering the surface thereof to abut the touch electrode to turn on the first switching element; the coupling sensing element further includes a first An electrode of the second substrate, the electrode being connected to a control end of the second switching element of the coupled inductive element.