Touch display panel and display device

Abstract

The present invention provides a touch display panel and a display device. The touch display panel includes a substrate having a display area and a peripheral area adjacent to each other; a plurality of pixel units arranged in the display area; a common electrode line arranged in the display area; a plurality of gate lines arranged in the display area and electrically connected to the plurality of pixel units; a gate drive circuit arranged in the peripheral area and having a plurality of output terminals correspondingly electrically connected to the plurality of gate lines; a conductive layer at least partially overlapped and arranged on the gate drive circuit; wherein the touch display panel further includes an adjustment element electrically connected between the common electrode line and the conductive layer.

Description

Technical Field

[0001] The present invention relates to a touch display panel and a display device using the same, and in particular to a touch display panel and a display device having a conductive layer in a peripheral area. Background Art

[0002] With the development of technology, display devices are widely used in many electronic products, such as mobile phones, tablet computers, watches, cars, etc.

[0003] For touch display devices, in order to pursue a higher screen ratio, most use GOA (Gate on Array) to drive the display panel. However, GOA will generate an electric field when it is in operation. These additional electric fields will affect the driving of the liquid crystal near the GOA around the display area. The existing practice is to cover a conductive layer above the GOA near the display area and connect the conductive layer to a common potential to shield the additional electric field generated by the GOA.

[0004] Usually the conductive layer is a transparent conductive layer, such as indium tin oxide (ITO). The transparent conductive layer has a large impedance, and maintaining the same potential for a long time can easily lead to charge accumulation. When the charge on the transparent conductive layer accumulates to a large enough amount, it will also affect the abnormal driving of the liquid crystal at the edge of the display area, which may cause the pixel units around the screen to leak abnormal light under a black screen.

[0005] Therefore, how to provide a touch display panel and a display device that can shield the additional electric field generated by GOA and avoid charge accumulation and improve display quality is one of the problems that need to be solved. Summary of the invention

[0006] Embodiments of the present invention provide a touch display panel and a display device, which can not only shield the additional electric field generated by the gate driving circuit, but also avoid the accumulation of charges in the conductive layer in the peripheral area, effectively avoid the large amount of charge accumulation affecting the abnormal driving of the liquid crystal at the edge of the display area, improve the problem of abnormal display in the periphery of the screen, and improve the display quality.

[0007] A touch display panel according to one embodiment of the present invention comprises a substrate having an adjacent display area and a peripheral area; a plurality of pixel units arranged in the display area; a common electrode line arranged in the display area; a plurality of gate lines arranged in the display area and electrically connected to the plurality of pixel units; a gate drive circuit arranged in the peripheral area and having a plurality of output terminals correspondingly electrically connected to the plurality of gate lines; and a conductive layer at least partially overlappingly arranged on the gate drive circuit; wherein the touch display panel further comprises an adjustment element electrically connected between the common electrode line and the conductive layer.

[0008] The above-mentioned touch display panel, wherein the adjusting element includes at least one switching element, each switching element has a first end, a second end and a control end, wherein the first end is electrically connected to the common electrode line, the second end is electrically connected to the conductive layer, and the control end is electrically connected to one of the multiple output ends.

[0009] The above-mentioned touch display panel, wherein, when the at least one switching element is closed, the conductive layer has a first potential, the common electrode line has a second potential, and the first potential is different from the second potential; when one of the multiple output terminals outputs a high level, the correspondingly connected switching element is turned on, and the conductive layer receives the second potential transmitted by the common electrode line.

[0010] The above touch display panel, wherein the touch display panel further comprises a plurality of touch electrodes arranged in an array and disposed in the display area, and the common electrode line is electrically connected to the plurality of touch electrodes.

[0011] The above-mentioned touch display panel, wherein the gate driving circuit includes: a first gate driving circuit, arranged adjacent to a first side of the display area; a second gate driving circuit, arranged adjacent to a second side of the display area; the first side and the second side are arranged opposite to each other.

[0012] In the above touch display panel, the conductive layer surrounds the display area; or the conductive layer is at least disposed on the first side and the second side.

[0013] The above-mentioned touch display panel, wherein the common electrode line includes a first common electrode line and a second common electrode line, the adjusting element includes a first switch element and a second switch element, the first switch element is located on the first side and is electrically connected between the first common electrode line and the conductive layer, and the second switch element is located on the second side and is electrically connected between the second common electrode line and the conductive layer.

[0014] In the above touch display panel, the conductive layer is a transparent conductive layer.

[0015] The above touch display panel, wherein the touch display panel further comprises a first connection pad and a second connection pad arranged on one side of the substrate, the conductive layer is electrically connected to the first connection pad, and the common electrode line is electrically connected to the second connection pad.

[0016] In the above touch display panel, the first connection pad and the second connection pad are used to connect the driving element to receive a first potential and a second potential, and the first potential is different from the second potential.

[0017] A display device according to an embodiment of the present invention includes any one of the touch display panels described above.

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 FIG. 1 is a schematic structural diagram of a touch display panel according to an embodiment of the present invention.

[0020] Figure 2 yes Figure 1 Magnified schematic diagram of area Q.

[0021] Figure 3 It is a partial structural diagram of a touch display panel according to an embodiment of the present invention.

[0022] Wherein, the reference numerals are:

[0023] 100: Touch display panel

[0024] 101: Substrate

[0025] 102: Pixel unit

[0026] 103: Common electrode line

[0027] 104: Gate drive circuit

[0028] 1041: First gate drive circuit

[0029] 1042: Second gate drive circuit

[0030] 105: Conductive layer

[0031] 106: Regulating element

[0032] 107: Touch electrode

[0033] 108: First connection pad

[0034] 109: Second connection pad

[0035] AA: Display area

[0036] BA: Peripheral area

[0037] GL1~GLN: Gate lines

[0038] SW: Switching element DETAILED DESCRIPTION

[0039] The structural principle and working principle of the present invention are described in detail below in conjunction with the accompanying drawings:

[0040] Figure 1is a schematic structural diagram of a touch display panel according to an embodiment of the present invention, Figure 2 yes Figure 1 A magnified schematic diagram of area Q, Figure 3 FIG. 1 is a schematic diagram of a partial structure of a touch display panel according to an embodiment of the present invention. Figure 1-Figure 3 As shown, the touch display panel 100 of the present invention includes a substrate 101, a pixel unit 102, a common electrode line 103, a gate driving circuit 104, a conductive layer 105 and an adjusting element 106. The substrate 101 has an adjacent display area AA and a peripheral area BA surrounding the display area AA, a plurality of pixel units 102 are arranged in the display area AA, a plurality of gate lines GL1-GLN (N is a positive integer) are arranged in the display area AA and electrically connected to the aforementioned plurality of pixel units 102, and the common electrode line 103 is arranged in the display area AA. The gate driving circuit 104 is arranged in the peripheral area BA and has a plurality of output terminals out1-outN, and the plurality of output terminals out1-outN are electrically connected to the plurality of gate lines GL1-GLN correspondingly, so as to transmit driving signals from the plurality of gate lines GL1-GLN to the plurality of pixel units 102 to drive the plurality of pixel units 102. The conductive layer 105 is at least partially overlapped on the gate driving circuit 104, and the regulating element 106 is electrically connected between the common electrode line 103 and the conductive layer 105. In one embodiment, the conductive layer 105 covers a portion of the gate driving circuit 104 adjacent to the display area AA.

[0041] In the touch display panel 100 of the present invention, a conductive layer 105 is covered on the gate driving circuit 104, and an adjusting element 106 is electrically connected between the common electrode line 103 and the conductive layer 105. The conductive layer 105 can not only shield the additional electric field generated by the gate driving circuit 104, but also continuously adjust the potential of the conductive layer 105 through the adjusting element 106 to prevent the conductive layer 105 from maintaining the same potential for a long time, thereby preventing charge accumulation and affecting the display.

[0042] like Figure 1As shown, the gate driving circuit 104 includes a first gate driving circuit 1041 and a second gate driving circuit 1042. The first gate driving circuit 1041 is disposed in the peripheral area BA and adjacent to the first side of the display area AA (the left side as shown in the figure), and the second gate driving circuit 1042 is disposed in the peripheral area BA and adjacent to the second side of the display area AA (the right side as shown in the figure). The output terminals out1, out3...outN-1 of the first gate driving circuit 1041 are electrically connected to the odd-numbered rows (the 1st, 3rd, 5th...rows) of the pixel units 102 through the corresponding gate lines GL1, GL3...GLN-1 to provide driving signals to the odd-numbered row pixel units 102, and the output terminals out2, out4...outN of the second gate driving circuit are electrically connected to the even-numbered rows (the 2nd, 4th, 6th...rows) of the pixel units 102 through the gate lines GL2, GL4...GLN to provide driving signals to the even-numbered row pixel units 102. In this embodiment, N is an even number, but is not limited thereto. In one embodiment, the first side and the second side may be arranged opposite to each other. In the present invention, only the gate driving circuit is arranged adjacent to the left and right sides of the display area and drives the odd-numbered pixel units and the even-numbered pixel units respectively as an example for explanation. Of course, the gate driving circuit may also be arranged adjacent to one side of the display area, such as the left side or the right side, or adjacent to the upper side or the lower side of the display area. The arrangement and driving method of the gate driving circuit of the present invention are not limited thereto.

[0043] Correspondingly, the conductive layer 105 is disposed adjacent to the first side and the second side of the display area AA, respectively, and the conductive layer 105 at least partially covers the first gate driving circuit 1041 and the second gate driving circuit 1042. Figure 3 As shown, the conductive layer 105 covers the first gate driving circuit 1041 and the second gate driving circuit 1042 adjacent to the display area AA. In actual operation, this is not limited to this. In the present invention, the conductive layer 105 is a transparent conductive layer, such as indium tin oxide (ITO). In this embodiment, the conductive layer 105 is disposed on two opposite sides of the display area AA. Of course, the conductive layer can also be disposed around the display area AA, such as around three sides of the display area AA. It can also be made of other conductive film layers. The present invention is not limited to this.

[0044] like Figure 2 , Figure 3As shown, the regulating element 106 may include at least one switch element SW, and the switch element SW may be a thin film transistor. The following description is made by taking the switch element SW as an N-type thin film transistor as an example. The switch element SW has a first end, a second end and a control end. Among them, the first end of the switch element SW is electrically connected to the common electrode line 103, the second end of the switch element SW is electrically connected to the conductive layer 105, and the control end of the switch element SW is electrically connected to an output end outn of the gate driving circuit 1041. The output end outn of the gate driving circuit 1041 is electrically connected to the corresponding gate line GLn, 1≤n≤N, so as to be indirectly electrically connected to the corresponding pixel unit 102 in the display area AA. In this embodiment, the switch element SW is an N-type thin film transistor. In other embodiments, the switch element SW may be a thin film transistor or multiple thin film transistors (for example, multiple thin film transistors are connected in parallel), and the present invention is not limited thereto. The regulating element 106 of the present invention may include at least one switch element SW, and the potential of the conductive layer 105 may be adjusted by turning on and off the switch element SW to prevent the conductive layer 105 from maintaining the same potential for a long time. Furthermore, the control terminal of the switch unit SW is electrically connected to the gate driving circuit 104 , so that the gate driving circuit 104 controls the on / off of the regulating element 106 to adjust the potential of the conductive layer 105 .

[0045] In the present invention, only the example of connecting the switching element SW to the corresponding gate line GLn is used for explanation. Of course, the regulating element 106 may also include multiple switching elements SW, and the multiple switching elements SW may be electrically connected to the corresponding multiple output terminals (or multiple gate lines among the gate lines GL1~GLN) of the gate driving circuit 104 respectively. Furthermore, a switching element SW may be electrically connected to each corresponding output terminal (or each gate line GL1~GLN) of the gate driving circuit 104, but the present invention is not limited to this.

[0046] In actual operation, the regulating element 106 may be disposed below the conductive layer 105 , in the gate driving circuit 1041 or in other areas of the peripheral region, or in the display area AA, but the present invention is not limited thereto.

[0047] For example Figure 1As shown, the touch display panel 100 further includes a first bonding pad 108 and a second bonding pad 109 disposed on one side (the lower side as shown in the figure) of the substrate 101. The conductive layer 105 is electrically connected to the first bonding pad 108, and the common electrode line 103 is electrically connected to the second bonding pad 109. The first bonding pad 108 and the second bonding pad 109 can be connected to a driving element, and the driving element provides electrical signals to the first bonding pad 108 and the second bonding pad 109, respectively, and the electrical signals are transmitted to the conductive layer 105 and the common electrode line 103 via the first bonding pad 108 and the second bonding pad 109.

[0048] The first connection pad 108 and the second connection pad 109 can be connected to the same driving element or different driving elements. For example, the first connection pad 108 is used to connect to a flexible circuit board (not shown in the figure) to receive a first potential COM1, and the second connection pad 109 is used to connect to a driving chip (not shown in the figure) so that the touch display panel 100 receives a second potential COM2 in an electrical state (or stage), wherein the first potential COM1 and the second potential COM2 have different potentials.

[0049] like Figure 1 As shown, the touch display panel 100 of the present invention further includes a plurality of touch electrodes 107 arranged in an array in the display area AA, and each common electrode line 103 is electrically connected to one of the plurality of touch electrodes 107 to achieve signal transmission between the corresponding touch electrode 107 and the second connection pad 109.

[0050] In one embodiment, the second potential COM2 is a touch sensing potential output by the driving element to sense the touch position when the touch display panel 100 is in the touch sensing stage, which can be transmitted to the corresponding touch electrode 107 via the second connection pad 109 and the common electrode line 103, and the first potential COM1 is generally another common potential required for the normal operation of the touch display panel 100. For example, each pixel unit 102 of the touch display panel 100 uses an amorphous silicon thin film transistor, the first potential COM1 is 0 to -1V, and the second potential COM2 is +3 to +4V or -3 to -4V. In actual operation, the first potential COM1 and / or the second potential COM2 may be different according to different models of the driving element.

[0051] For example Figure 2 , Figure 3As shown, the regulating element 106 is turned on or off under the drive of the corresponding output terminal of the gate driving circuit 104 (or the gate line GLn connected thereto). In one embodiment, when the output terminal of the corresponding gate driving circuit 1041 outputs a high level, the gate driving signal of the corresponding gate line GLn is a high level. At this time, the corresponding connected switch element SW is in an open state, the conductive layer 105 is electrically connected to the common electrode line 103, and the conductive layer 106 receives the potential transmitted by the common electrode line 103. When the output terminal of the corresponding gate driving circuit 1041 outputs a low level, the gate driving signal of the corresponding gate line GLn is a low level. At this time, the corresponding connected switch element SW is in a closed state, the conductive layer 105 is electrically disconnected from the common electrode line 103, and the conductive layer 106 receives the first potential COM1. By switching the switch element SW on and off, the conductive layer 106 alternately receives different potentials, which can avoid the problem that the conductive layer 105 maintains the same potential for a long time and accumulates charges, affecting the display.

[0052] Figure 2 In the embodiment shown, the switch unit SW is an N-type thin film transistor. Of course, in other embodiments, the switch element SW may also be a P-type thin film transistor or other switch units, as long as they can be turned on / off by the gate drive signal, and the present invention is not limited thereto.

[0053] In one embodiment, when the touch display panel 100 is in the touch sensing stage, the first connection pad 108 is used to receive the first potential COM1, and the second connection pad 109 is used to receive the second potential COM2, wherein the first potential COM1 and the second potential COM2 are different in potential. At this time, the switch element SW included in the adjustment element 106 is closed, the conductive layer 105 has the first potential COM1, and the common electrode line 103 has the second potential COM2; when the touch display panel 100 switches from the touch sensing stage to the display stage, the adjustment element 106 includes The switch element SW is turned on, and the potential of the common electrode line 103 is transmitted to the conductive layer 105. At this time, there is a potential difference between the potential of the common electrode line 103 and the first potential COM1 originally possessed by the conductive layer 105. After the potential of the common electrode line 103 is transmitted to the conductive layer 105, the potential of the conductive layer 105 changes. When the touch display panel 100 switches from the display stage to the touch sensing stage again, the switch element SW included in the adjustment element 106 is turned off, and the conductive layer 105 receives the first potential COM1 transmitted from the first connection pad 108 again. Thus, by switching between different electrical states (or different stages) of the touch display panel 100, the switch element SW of the adjustment element 106 is switched on and off, and the potential of the conductive layer 105 is continuously adjusted, which can prevent the conductive layer 105 from maintaining the same potential for a long time, thereby preventing the problem of charge accumulation and affecting the display.

[0054] In one embodiment, when the touch display panel 100 is in the touch sensing stage, the second connection pad 109 receives the second potential COM2 and transmits it to the common electrode line 103 and the touch electrode 107. When the touch display panel 100 switches from the touch sensing stage to the display stage, the second connection pad 109 receives another potential instead. However, during the switching, the potential of the common electrode line 103 gradually changes from the second potential COM2 to the other potential. Therefore, when the switch element SW of the regulating element 106 switches from closed to open, there is still a potential difference between the potential of the common electrode line 103 and the first potential COM1. When the switch element SW is opened, the potential of the common electrode line 103 can be transmitted to the conductive layer 105, so that the potential of the conductive layer 105 changes. In one embodiment, the other potential can be the first potential COM1.

[0055] In one embodiment, only the adjustment element 106 is provided adjacent to the first side of the display area AA as an example for description. Of course, the adjustment element 106 can also be provided adjacent to the first side and the second side (not shown in the figure) of the display area AA. For example, the common electrode line includes a first common electrode line 103 and a second common electrode line 103, the first common electrode line 103 is provided adjacent to the first side in the display area AA, and the second common electrode line 103 is provided adjacent to the second side in the display area AA. The adjustment element 106 includes a first switch element and a second switch element, the first switch element is provided adjacent to the first side of the display area AA, and the second switch element is provided adjacent to the second side of the display area AA. The first switch element adjacent to the first side of the display area AA is electrically connected between the first common electrode line 103 on the first side of the display area AA and the conductive layer 105, and the second switch element adjacent to the second side of the display area AA is electrically connected between the second common electrode line 103 on the second side of the display area AA and the conductive layer 105.

[0056] In another embodiment, the regulating element 106 may include a plurality of switch elements adjacent to the second side of the display area AA, and the plurality of switch elements may be electrically connected to the corresponding plurality of output terminals (or a plurality of gate lines GL1 to GLN) of the gate driving circuit 104, or a switch element may be electrically connected to each output terminal (or each gate line GL1 to GLN) of the gate driving circuit, and the present invention is not limited thereto. Moreover, the regulating element 106 may be disposed below the conductive layer 105, in the gate driving circuit 1042 or in other areas of the peripheral area, or in the display area AA, and the present invention is not limited thereto.

[0057] The present invention further provides a display device, comprising any one of the touch display panels described above.

[0058] According to an embodiment of the present invention, by providing an adjustment element between the conductive layer and the common electrode line, the additional electric field generated by the gate driving circuit can be shielded, and the gate driving circuit turns on / off the adjustment element. Through the potential difference between the conductive layer and the common electrode line, the conductive layer is prevented from maintaining the same potential for a long time and accumulating charges, which effectively prevents the large amount of charge accumulation from affecting the abnormal driving of the liquid crystal at the edge of the display area, improves the occurrence of abnormal light leakage around the screen under a black screen, and improves the display quality.

[0059] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A touch display panel, characterized in that: include: A substrate having a display area and a peripheral area adjacent to each other; A plurality of pixel units are arranged in the display area; A common electrode line, disposed in the display area; A plurality of gate lines are disposed in the display area and electrically connected to the plurality of pixel units; A gate driving circuit is disposed in the peripheral area and has a plurality of output terminals correspondingly electrically connected to the plurality of gate lines; a conductive layer, at least partially overlapping the gate drive circuit; wherein the touch display panel further includes an adjusting element, electrically connected between the common electrode line and the conductive layer; wherein, The regulating element includes at least one switching element, each switching element having a first end, a second end and a control end, wherein the first end is electrically connected to the common electrode line, the second end is electrically connected to the conductive layer, and the control end is electrically connected to one of the multiple output ends.

2. The touch display panel according to claim 1, wherein: When at least one switching element is closed, the conductive layer has a first potential, the common electrode line has a second potential, and the first potential is different from the second potential; when one of the multiple output terminals outputs a high level, the correspondingly connected switching element is turned on, and the conductive layer receives the potential transmitted by the common electrode line.

3. The touch display panel according to claim 1, wherein: The touch display panel further includes a plurality of touch electrodes arranged in an array and disposed in the display area, and the common electrode line is electrically connected to the plurality of touch electrodes.

4. The touch display panel according to claim 1, wherein: The gate drive circuit comprises: a first gate driving circuit, disposed adjacent to a first side of the display area; a second gate driving circuit disposed adjacent to a second side of the display area; The first side is arranged opposite to the second side.

5. The touch display panel according to claim 4, wherein: The conductive layer surrounds the display area; or the conductive layer is at least disposed on the first side and the second side.

6. The touch display panel according to claim 4, wherein: The common electrode line includes a first common electrode line and a second common electrode line, and the adjusting element includes a first switching element and a second switching element, the first switching element is located on the first side and is electrically connected between the first common electrode line and the conductive layer, and the second switching element is located on the second side and is electrically connected between the second common electrode line and the conductive layer.

7. The touch display panel according to claim 1, wherein: The conductive layer is a transparent conductive layer.

8. The touch display panel according to claim 1, wherein: The touch display panel further includes a first connection pad and a second connection pad disposed on one side of the substrate, the conductive layer is electrically connected to the first connection pad, and the common electrode line is electrically connected to the second connection pad.

9. The touch display panel according to claim 8, wherein: The first connection pad and the second connection pad are used to connect the driving element to receive a first potential and a second potential, and the first potential is different from the second potential.

10. A display device, characterized in that: include: A touch display panel according to any one of claims 1 to 9.

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