Touch display structure, liquid crystal display panel and display device

Abstract

The application discloses a touch display structure, a liquid crystal display panel and a display device. A bridging unit in the touch display structure is arranged between two adjacent touch display units. The bridging unit comprises a first end, a second end and a control end. In the two adjacent touch display units, the touch common electrode of one is connected with the first end of the bridging unit, and the touch common electrode of the other is connected with the second end of the bridging unit. The control end of the bridging unit is configured to make the first end of the bridging unit and the second end of the bridging unit conductive or non-conductive. When the bridging unit is conductive, the touch common electrodes of the adjacent touch display units are connected, so that the difference in common voltage fluctuation amplitude can be reduced or eliminated, and the in-plane horizontal line problem is improved. Meanwhile, the bridging unit can be controlled to be non-conductive. At this time, the adjacent touch display units are in a disconnected state. At this time, the position deviation does not occur when the touch action is detected, that is, the accuracy of touch detection is not affected by the bridging unit.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of liquid crystal display, and in particular, relates to a touch display structure, a liquid crystal display panel and a display device. BACKGROUND

[0002] At present, in the test pictures of flicker (Flicker) and sub-pixel level (Sub-Pixel-On / Off), the horizontal stripes easily appear on the in-cell liquid crystal display panel, which specifically means that there are horizontal stripes in the horizontal direction of the touch display panel, which may cause touch failure, coordinate drift or display abnormalities and other problems.

[0003] In the related art, the pixel arrangement of the test picture can be detected by the pattern detection function (Pattern Detect Fuction, PDF), and then the polarity of the data signal is changed, such as changing the original horizontal 1Dot to 1+2Dot, so as to improve the horizontal stripe problem. However, after starting the pattern detection function, the debugging function of the best common voltage of the panel cannot be performed, and the pattern detection function needs to be closed before the best common voltage can be debugged, that is, the best common voltage cannot be obtained when the pattern detection function is started, but the pattern detection function cannot be closed to improve the horizontal stripe problem.

[0004] It should be noted that the information disclosed in the above background and technical part is only used to strengthen the understanding of the background of the present application, and therefore can include information which does not constitute prior art known to those skilled in the art. SUMMARY

[0005] The purpose of the present application is to provide a touch display structure, a liquid crystal display panel and a display device, which can improve the horizontal stripe problem of the display panel in the related art.

[0006] The present application provides a touch display structure, which comprises a substrate and a plurality of touch display groups arranged in the substrate in sequence; the touch display group comprises:

[0007] K touch display units arranged in sequence in the column direction, the touch display unit comprising a touch common electrode and a plurality of sub-pixels arranged in the row direction and the column direction, the sub-pixel comprising a pixel electrode, wherein in the touch display unit: the orthogonal projection of each sub-pixel pixel electrode on the substrate is located within the orthogonal projection of the touch common electrode on the substrate;

[0008] K touch lines, one end of the kth touch line is connected with the touch common electrode of the kth touch display unit, and the other end of the kth touch line is connected with a common voltage source; wherein K is an integer greater than 1, 1≤k≤K;

[0009] The bridge unit is arranged between the two adjacent touch display units, and the bridge unit comprises a first end, a second end and a control end. In the two adjacent touch display units, the touch common electrode of one is connected with the first end of the bridge unit, the touch common electrode of the other is connected with the second end of the bridge unit, and the control end of the bridge unit is configured to make the first end of the bridge unit and the second end of the bridge unit conductive or non-conductive.

[0010] In an example embodiment of the present disclosure, the touch display unit comprises G rows of scan lines, and the sub-pixel comprises a first drive transistor. In the sub-pixel, the pixel electrode is connected with the first end of the first drive transistor, the gth row of scan lines and the control end of the first drive transistor of the sub-pixel corresponding thereto are connected, and G is an integer greater than 1, 1≤g≤G. The control end of the bridge unit is connected with at least one scan line in the adjacent touch display unit.

[0011] In an example embodiment of the present disclosure, the bridge unit comprises M second drive transistors, the control end of the M second drive transistors is connected with the Gth scan line of the kth touch display unit, or the control end of the M second drive transistors is connected with the first row of scan lines of the (k+1)th touch display unit, wherein 1≤M≤G.

[0012] In an example embodiment of the present disclosure, the bridge unit comprises M second drive transistors, the control end of the (M-m)th second drive transistor is connected with the (G-m)th scan line of the kth touch display unit, wherein 0≤m<M≤G, or the control end of the mth second drive transistor is connected with the gth row of scan lines of the (k+1)th touch display unit, wherein 1≤m≤M≤G, and m=g.

[0013] In an example embodiment of the present disclosure, when the control end of the bridge unit is connected with the scan line of the kth touch display unit, a first bridge via hole is arranged on the touch common electrode of the kth touch display unit, and a second bridge via hole is arranged on the touch common electrode of the (k+1)th touch display unit. The first end of the bridge unit is connected with the first bridge via hole, and the second end of the bridge unit is connected with the second bridge via hole.

[0014] In an example embodiment of the present disclosure, when the control end of the bridge unit is connected with the scan line of the kth touch display unit, a second bridge via hole is arranged on the touch common electrode of the (k+1)th touch display unit. The first end of the bridge unit is connected with the touch line of the kth touch display unit, and the second end of the bridge unit is connected with the second bridge via hole.

[0015] In an example embodiment of the present disclosure, in the sub-pixel: the pixel electrode comprises a via end, a pixel electrode via is arranged on the via end, and the second end of the first drive transistor is connected to the pixel electrode via via the via end; the bridging unit is arranged on the side of the pixel electrode via away from the first drive transistor, and the control end of the bridging unit and the control end of the first drive transistor are connected to the same scan line.

[0016] In an example embodiment of the present disclosure, the driving timing of the scan line comprises a display period and a touch detection period; the bridging unit is configured to control the first end of the bridging unit and the second end of the bridging unit to be turned on or turned off via the scan line connected to the bridging unit when the driving timing of the scan line connected to the bridging unit is in the display period; and the bridging unit is configured to keep the first end of the bridging unit and the second end of the bridging unit turned off when the driving timing of the scan line connected to the bridging unit is in the touch detection period.

[0017] The present application provides a liquid crystal display panel, comprising the touch display structure according to any one of the above, an opposite substrate arranged in a cell with the touch display structure, and liquid crystal molecules filled between the opposite substrate and the touch display structure.

[0018] The present application provides a display device, comprising the liquid crystal display panel according to any one of the above and a backlight module, wherein the liquid crystal display panel is arranged on the light emitting side of the backlight module.

[0019] The present application has the following beneficial effects:

[0020] The present application increases the bridging unit between the adjacent two touch display units, and in the adjacent two touch display units: the touch common electrode of one is connected to the first end of the bridging unit, and the touch common electrode of the other is connected to the second end of the bridging unit, and the control end of the bridging unit is configured to make the first end of the bridging unit and the second end of the bridging unit turned on or turned off, that is, when the first end and the second end of the bridging unit are turned on, the touch common electrodes of the adjacent two touch display units are directly connected, and then the common voltage fluctuation of one can be coupled to the other through the touch line, and can also be coupled through the bridging unit, so that the common voltage fluctuation amplitude difference of the touch display unit can be reduced or disappeared, to balance the common voltage of each touch display unit, thereby improving the in-plane horizontal line problem. At the same time, the first end and the second end of the bridging unit can also be controlled to be turned off, at this time, the adjacent two touch display units are in a disconnected state, and then at this time, the position inaccuracy problem does not occur when detecting the touch action, that is, the present application increases the bridging unit and does not affect the accuracy of touch detection.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the application and, together with the description, further serve to explain the principles of the application. It is to be expressly understood, however, that the drawings are included herein for illustrative purposes only and that they are subject to interpretation, modification and / or change, without departing from the scope and spirit of the application.

[0023] Figure 1 A schematic diagram of a liquid crystal display panel in the related art is shown.

[0024] Figure 2 A schematic diagram of a sub-pixel equivalent circuit of an in-cell touch liquid crystal display in the related art is shown.

[0025] Figure 3 A schematic diagram of a waveform of a data line voltage coupled to a common electrode voltage in the related art is shown.

[0026] Figure 4 A schematic diagram of an equivalent circuit of two closest rows of pixels in two adjacent touch display units in the related art is shown.

[0027] Figure 5 A timing diagram of a scan line voltage and a touch common electrode voltage in the related art is shown.

[0028] Figure 6 A schematic diagram of a touch display structure according to an embodiment of the application is shown.

[0029] Figure 7 A partial pixel circuit of a touch display structure according to an embodiment of the application is shown.

[0030] Figure 8 A partial pixel structure of a touch display structure according to an embodiment of the application is shown.

[0031] Figure 9 A timing diagram of a scan line voltage and a touch common electrode voltage after applying an embodiment of the application is shown.

[0032] Figure 10 A partial pixel structure of a touch display structure according to an embodiment of the application is shown.

[0033] Figure 11 A partial pixel structure of a touch display structure according to an embodiment of the application is shown.

[0034] Figure 12The timing diagram of the scan line voltage and the touch common electrode voltage after the application of an embodiment of the application is shown schematically.

[0035] Figure 13 The schematic diagram of the local pixel structure in the touch display structure provided by an embodiment of the application is shown schematically.

[0036] Figure 14 The schematic diagram of the local pixel structure in the touch display structure provided by an embodiment of the application is shown schematically.

[0037] Figure 15 The schematic diagram of the local pixel structure in the touch display structure provided by an embodiment of the application is shown schematically.

[0038] Figure 16 The schematic diagram of the local pixel structure in the touch display structure in the related art is shown schematically.

[0039] Figure 17 The schematic diagram of the local pixel structure in the touch display structure provided by an embodiment of the application is shown schematically.

[0040] Figure 18 The voltage timing diagram of the bridge unit provided by an embodiment of the application is shown schematically.

[0041] Figure 19 The structural schematic diagram of the display device provided by an embodiment of the application is shown schematically.

[0042] Legend of reference signs:

[0043] 1. touch display group;

[0044] 10. touch display unit;

[0045] 101. sub-pixel; 102. scan line; 103. data line; 104. touch common electrode; 1011. pixel electrode; 1011a. via end; 1012. pixel electrode via; T1. first drive transistor;

[0046] 11. touch line;

[0047] 12. bridge unit;

[0048] T2. second drive transistor; 121. first bridge via; 122. second bridge via;

[0049] 2. display device;

[0050] 21. liquid crystal display panel; 22. backlight module;

[0051] 211. touch display structure; 212. opposed substrate; 213. liquid crystal molecule. DETAILED DESCRIPTION

[0052] Example implementations are now described with reference to the drawings. Example implementations can, however, be implemented in many different forms and should not be construed as limited to the examples set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the example implementations to those skilled in the art.

[0053] Moreover, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the implementations of the disclosure can be practiced without one or more of the

[0054] The disclosure is further described below with reference to the accompanying drawings and specific examples. It is to be understood that the various embodiments of the disclosure described herein are merely exemplary and that the scope of the disclosure is not limited to the embodiments described herein. In the drawings, like reference numerals refer to like elements throughout.

[0055] The following first introduces a schematic diagram of horizontal lines appearing on an In-cell Touch LCD panel and the specific reasons. In a preset test picture, horizontal lines as shown in Figure 1 may appear on the touch display panel, in which Figure 1 the black rectangles in the figure represent touch display units (Touch Sensor) on the touch display panel, Figure 1 the large gaps between the touch display units in the figure are only to distinguish the areas where the touch pieces are located. In an actual touch display panel, the gaps between the touch display units are so small that they are difficult to be distinguished by the naked eye, and the area of each touch display unit is only for illustration and is not intended to limit the size of the touch display unit on the touch display panel. The touch display unit is black only to facilitate the distinction between the normally displayed area and the horizontal lines, and it is not intended to limit that the horizontal lines appear high light only when the touch display panel displays black. When the touch display panel displays other colors or patterns, multiple horizontal lines may also appear at the end of each touch display unit.

[0056] In combination with Figure 2 , in a sub-pixel, the control end of a pixel transistor (TFT) is connected to a scan line (or Gate line), the first end of the pixel transistor is connected to a storage capacitor (Storage Capacitor, CST ) and Liquid Crystal Capacitor (C LC Storage capacitor C ST and liquid crystal capacitor C LC The other end is connected to the touch common electrode (COMITO), and the second end of the pixel TFT is connected to the data line (or data line). It should be understood that the first and second ends of the pixel transistor are only used to represent two ends of the pixel transistor and do not define the actual meaning of each end of the pixel transistor. For example... Figure 3 As shown, assuming Figure 2 During the previous frame, the peak driving voltage Vp of the pixel electrode was negative. During the current frame, when the scan line voltage of the pixel transistor changes from low to high, the pixel transistor changes from off to on, and the data line is connected to the storage capacitor C. ST and liquid crystal capacitor C LC Charging. At the instant the pixel transistor turns on, the voltage Vp suddenly changes from negative to positive. Due to the bootstrap effect of the capacitor, this voltage will be released through the storage capacitor C. ST and liquid crystal capacitor C LC The common electrode voltage is coupled, so the common electrode voltage Vcom will also show a spike.

[0057] like Figure 4 As shown, the touch lines of the k-th row touch display unit and the (k+1)-th row touch display unit are connected to a common voltage source. For the touch display units in the middle area of ​​the panel, the touch lines are routed further, thus generating a trace impedance R. TX This results in a difference in the Vcom voltage change between the touch display unit in row k and the touch display unit in row (k+1). Specifically, as follows... Figure 5 As shown, scan lines G(n) to G(n+3) are the scan lines connecting the last three rows of pixels in the k-th row of the touch display unit. The instant the voltage of G(n) to G(n+3) changes from low to high, the Vp voltage suddenly changes from negative to positive, causing a change in the Vcom voltage of the k-th row of the touch display unit. Scan line G(n+4) is the scan line connecting the first row of pixels in the (k+1)-th row of the touch display unit. The instant the voltage of G(n+4) changes from low to high, the Vp voltage suddenly changes from negative to positive, causing a change in the Vcom voltage of the (k+1)-th row of the touch display unit. Due to the presence of trace impedance R... TXFor example, after the voltage of scan line G(n) goes low and the voltage of scan line G(n+4) goes high, there is a difference in the Vcom voltage change between the k-th and (k+1)-th row touch display units. Specifically, Vcom(k) is less than Vcom(k+1), meaning that the Vcom excitation of the k-th row touch display unit is attenuated. The greater the effective voltage difference remaining on the liquid crystal, the brighter the pixels in the corresponding row. Therefore, in the last few rows of each touch display unit, because the Vcom excitation is smaller, the pixels in these rows will be brighter, resulting in horizontal stripes in the display panel.

[0058] In related technologies, besides the polarity-changing scheme described in the background, there is also a scheme that adds shorted pixel transistors to the touch sensor. The gate of the shorted transistor is connected from the left and right edges of the panel to the level shift module. During the display of the display panel, the gate of the shorted transistor is pulled high, making the shorted transistor conduct, thereby connecting all touch display units to the common electrode bus to reduce the trace impedance of the touch line and improve the horizontal stripe problem. However, in this scheme, the traces connecting the touch display units in the center area to the common electrode are farther away, resulting in a certain degree of voltage drop in this area. Therefore, horizontal stripes still exist in the center area, and the improvement effect is poor.

[0059] This application provides a touch display structure, such as Figure 6 As shown, the touch display structure includes: a substrate and multiple rows of touch display groups 1 arranged sequentially on the substrate. The touch display group 1 includes: K touch display units 10, K touch lines 11 and multiple bridging units 12, where K is an integer greater than 1.

[0060] The K touch display units 10 are arranged sequentially at intervals along the column direction, such as... Figure 7 As shown, the touch display unit 10 includes: G rows of scan lines ( Figure 7 Only a portion of the rows are shown (G is an integer greater than 1), column D data lines (D is an integer greater than 1), the touch common electrode 104, and multiple sub-pixels 101 arranged in an array along the row and column directions. Each sub-pixel 101 includes a pixel electrode 1011, and in the touch display unit 10, as shown... Figure 8 As shown, the orthographic projection of the pixel electrode 1011 of each sub-pixel 101 onto the substrate is located within the orthographic projection of the touch common electrode 104 onto the substrate.

[0061] In the K touch lines 11, one end of the kth touch line 11 is connected to the touch common electrode of the kth touch display unit 10, the other end of the kth touch line 11 is connected to a common voltage source, and 1≤k≤K. The common voltage source is a controlled and time-division multiplexed voltage source. In a display period, the common voltage source provides a direct current (or low frequency alternating current) common voltage required for maintaining the display of the panel, so that the liquid crystal works normally. In a touch detection period, the common voltage source is injected with a high frequency touch excitation signal (such as a 100 kHz square wave or parabolic wave) by a touch IC.

[0062] As shown in Figure 6 , the bridge unit 12 is arranged between the adjacent two touch display units 10, and the bridge unit 12 includes a first end a, a second end b, and a control end c. In the adjacent two touch display units 10: the touch common electrode 104 of one is connected to the first end a of the bridge unit 12, the touch common electrode 104 of the other is connected to the second end b of the bridge unit 12, and the control end c of the bridge unit 12 is configured to make the first end a of the bridge unit 12 and the second end b of the bridge unit 12 conductive or non-conductive. For example, the bridge unit 12 is arranged between the kth row and the (k+1)th row of touch display units 10. When the first end a and the second end b of the bridge unit 12 are conductive, it is equivalent to connecting the touch common electrodes 104 of the adjacent two touch display units 10. Then, as shown in Figure 9 , the dashed line represents the Vcom voltage after the application of the present application. Figure 9 The scanning line voltage and the Vcom voltage are only some cases, and do not represent that the scanning line voltage and the Vcom voltage only exist in the case shown in Figure 9 , it can be seen that after the voltage of the scanning line G(n) of the kth row of touch display units 10 changes from high to low, and before G(n+3) changes from high to low, Vcom(k) and Vcom(k+1) can be kept balanced, so that the feedthrough voltage ΔVp of the last few rows of the kth row of touch display units 10 is unchanged, the effective voltage difference left on the liquid crystal is kept unchanged, and the brightness of the corresponding row of pixels is also unchanged, thereby improving the problem of horizontal lines appearing on the embedded touch liquid crystal display panel.

[0063] In the technical solution of the present application, the bridge unit is added between two adjacent touch display units, and in the two adjacent touch display units: the touch common electrode of one is connected with the first end of the bridge unit, the touch common electrode of the other is connected with the second end of the bridge unit, and the control end of the bridge unit is configured to make the first end of the bridge unit and the second end of the bridge unit conductive or non-conductive, that is, when the first end and the second end of the bridge unit are conductive, the touch common electrodes of the two adjacent touch display units are connected, and then the common voltage fluctuation of one can be coupled to the other through the touch line, and can also be coupled through the bridge unit, so that the common voltage fluctuation amplitude difference of the touch display unit can be reduced or eliminated, the common voltage of each touch display unit is balanced, and the in-plane horizontal line problem is improved.

[0064] In an exemplary embodiment of the present disclosure, as shown in Figure 7 The sub-pixel 101 further includes a first drive transistor T1, and in the sub-pixel 101: the pixel electrode 1011 is connected with the first end of the first drive transistor T1; the gth row scan line and the control end of the first drive transistor T1 of the corresponding sub-pixel 101 are connected, where 1≤g≤G; and the dth column data line is connected with the second end of the first drive transistor T1, where 1≤d≤D. The control end of the bridge unit 12 is connected with at least one scan line in the kth row of touch display units 10, or the control end of the bridge unit 12 is connected with at least one scan line in the (k+1)th row of touch display units 10. Assuming that the transistor in the bridge unit 12 is conductive at high level and non-conductive at low level, when the voltage of any one row of scan lines connected with the bridge unit 12 changes from low level to high level, the first end and the second end of the bridge unit 12 are conductive, and the kth row and the (k+1)th row of touch display units 10 are connected; when the voltage of part of the scan lines connected with the bridge unit 12 changes from high level to low level, and the voltage of the other scan lines remains high, the first end and the second end of the bridge unit 12 are still conductive; when the voltage of all the scan lines connected with the bridge unit 12 is low, the kth row and the (k+1)th row of touch display units 10 are in a disconnected or unconnected state. Then the bridge unit 12 can be in a corresponding conductive or non-conductive state by controlling the voltage of different rows of scan lines.

[0065] In an exemplary embodiment of the present disclosure, the bridge unit 12 includes M second drive transistors T2, the control end of the M second drive transistors T2 is connected with the Gth scan line of the kth touch display unit 10, or the control end of the M second drive transistors T2 is connected with the first scan line of the (k+1)th touch display unit 10, where 1≤M≤G.

[0066] Specifically, as shown in Figure 7As shown, when the bridging unit 12 includes only one second driving transistor T2, and the control terminal of the second driving transistor T2 is connected to the k-th touch display unit 10, then as follows: Figure 9 As shown, when the voltage G(n) changes from high level to low level, G(n+1) to G(n+3) are still high level, and the conduction time of G(n+3) is longer. Therefore, the second driving transistor T2 is connected to the scan line G(n+3) (the Gth scan line, or the last row scan line), which can keep Vcom(k) balanced when the kth touch display unit 10 is displaying, thereby solving the problem of horizontal lines appearing when the last few rows of sub-pixels 101 are displayed in the touch display unit. It should be understood that the number of rows with horizontal lines in the touch display unit is related to the CK (Clock signal) value and duty cycle of the touch display unit. For example, if the CK value is 6, meaning the touch display unit 10 includes 6 rows of sub-pixels 101 with a duty cycle of 50%, then the last 2 rows of sub-pixels 101 will have horizontal lines. If the CK value is 8, meaning the touch display unit 10 includes 8 rows of sub-pixels 101 with a duty cycle of 50%, then the last 3 rows of sub-pixels 101 will have horizontal lines. Similarly, if the CK value is 12, meaning the touch display unit 10 includes 12 rows of sub-pixels 101 with a duty cycle of 50%, then the last 5 rows of sub-pixels 101 will have horizontal lines. It can be seen that as the CK value increases, the number of rows with horizontal lines in the touch display unit 10 also increases, and the number of rows with horizontal lines is approximately (CK / 2-1). It should be understood that the formula for determining the number of rows with horizontal lines summarized above is used to roughly determine the number of rows with horizontal lines, while the actual number of rows with horizontal lines on the panel in a product needs to be determined based on specific circumstances.

[0067] like Figure 10 As shown, when the bridging unit 12 includes only a plurality of second driving transistors T2, and the control terminal of the second driving transistor T2 is connected to the k-th touch display unit 10, its working principle is the same as that of the second driving transistor T2. Figure 7 The illustrated embodiment is similar. When scan line G(n+3) is high, all the second driving transistors T2 controlled by scan line G(n+3) are turned on. This embodiment uses a scheme of multiple second driving transistors connected in parallel, which can further reduce the bridging resistance between touch display units 10.

[0068] For example Figure 11 As shown, when the bridging unit 12 includes only one second driving transistor T2, and the control terminal of the second driving transistor T2 is connected to the (k+1)th touch display unit 10, then as Figure 12As shown, when the G(n) voltage changes from high level to low level, the G(n+4) of the (k+1)th touch display unit 10 changes from low level to high level, and the time when the G(n+4) is high level lasts until the G(n+3) becomes low level. Then, by the same reason, the second driving transistor T2 and the scanning line G(n+4) (i.e. the first row scanning line of the (k+1)th touch display unit 10) are connected, which can keep the Vcom(k) balanced when the kth touch display unit 10 displays, thereby solving the problem of horizontal lines appearing when the last few rows of sub-pixels 101 in the touch display unit 10 display. It should be understood that if the scanning order of the touch display structure is from the top sub-pixel 101 to the bottom sub-pixel 101 in the drawing, in a frame, the part of the touch display unit 10 at the end of the scanning order, because the touch line 11 of these touch display units 10 has a shorter running length, can also not have the problem of horizontal lines, so it is also feasible not to set the bridge unit 12 for the last row or even multiple rows of touch display units 10.

[0069] For example Figure 13 As shown, the bridge unit 12 includes a plurality of second driving transistors T2, the control end of the second driving transistor T2 is connected with the (k+1)th touch display unit 10, and when the scanning line G(n+4) is high level, the plurality of second driving transistors T2 controlled by the scanning line G(n+4) are all turned on. The parallel connection scheme of the plurality of second driving transistors in the embodiment can further reduce the bridge resistance between the touch display units 10.

[0070] In an exemplary embodiment of the present disclosure, the bridge unit 12 includes M second driving transistors T2; the control end of the (M-m)th second driving transistor T2 is connected with the (G-m)th scanning line of the kth touch display unit 10, where 0≤m

[0071] Specifically, the bridge unit 12 includes M second driving transistors T2, and the control end of the second driving transistor T2 is connected with the kth touch display unit 10, where 0≤m Figure 14As shown, the control terminal of each second drive transistor T2 in the embodiment is connected to a different scan line in the kth touch display unit 10. This arrangement is made in consideration of the fact that when multiple second drive transistors T2 are connected to the same scan line, the load of the scan line is large, which can affect the Slew Rate of the first drive transistor T1 and the second drive transistor T2 on the scan line. By connecting the control terminal of each second drive transistor T2 to a different scan line, it is also ensured that the kth touch display unit 10 and the (k+1)th touch display unit 10 remain connected during the display period.

[0072] Similarly, the bridge unit 12 includes M second drive transistors T2, and the control terminal of the second drive transistor T2 is connected to the (k+1)th touch display unit 10, where 1≤m≤M≤G, m=g. Assuming that G=8 and M=3, the value of m can be 1, 2 and 3. As shown, Figure 15 When m=1, the control terminal of the first second drive transistor T2 is connected to the first scan line of the (k+1)th touch display unit 10; when m=2, the control terminal of the second second drive transistor T2 is connected to the second scan line of the (k+1)th touch display unit 10; and when m=3, the control terminal of the third second drive transistor T2 is connected to the third scan line of the (k+1)th touch display unit 10. In this way, the control terminal of each second drive transistor T2 in the embodiment is connected to a different scan line in the (k+1)th touch display unit 10.

[0073] In an exemplary embodiment of the present disclosure, as Figure 8As shown, the region of the sub-pixel 101 includes: a scan line 102, a data line 103, a touch common electrode 104, a pixel electrode 1011 and a first drive transistor T1. The pixel electrode 1011 includes a via end 1011a, and a pixel electrode via 1012 is arranged on the via end 1011a. The second end of the first drive transistor T1 is connected to the pixel electrode via 1012 via the via end 1011a. The bridge unit 12 is arranged on the side of the pixel electrode via 1012 away from the first drive transistor T1, and the control end of the bridge unit 12 and the control end of the first drive transistor T1 are connected to the same scan line. The control end of the first drive transistor T1 is connected to the scan line 102, and the second end of the first drive transistor T1 is connected to the data line 103. If the bridge unit 12 between the two adjacent touch display units 10 is a second drive transistor T2, then in the sub-pixel 101: the second drive transistor T2 is arranged on the side of the pixel electrode via 1012 away from the first drive transistor T1, and the control end of the second drive transistor T2 and the control end of the first drive transistor T1 are connected to the same scan line 102. If the bridge unit 12 between the two adjacent touch display units 10 includes a plurality of second drive transistors T2, then the plurality of second drive transistors T2 are respectively arranged in different sub-pixels 101. According to the scan line 102 to which the second drive transistor T2 is connected, the second drive transistor T2 is arranged on the side of the pixel electrode via 1012 in the corresponding row of sub-pixels 101 away from the first drive transistor T1. In this way, the number of second drive transistors T2 in each sub-pixel 101 can be reduced, the sub-pixels 101 can be evenly distributed in the panel, and the influence on the aperture ratio after adding the bridge unit 12 can be reduced. It should be understood that, as Figure 16 As shown, when the bridge unit 12 is not arranged, there is a certain region between the pixel electrode via 1012 and the left side of the touch line 11. Arranging the second drive transistor T2 in this region will not affect the touch effect, and can also minimize the influence on the aperture ratio.

[0074] In an exemplary embodiment of the present disclosure, as Figure 8 As shown, when the control end of the bridge unit 12 is connected to the scan line 102 of the kth touch display unit 10, a first bridge via 121 is arranged on the touch common electrode 104 of the kth touch display unit 10, and a second bridge via 122 is arranged on the touch common electrode of the (k+1)th touch display unit 10. The first end of the bridge unit 12 is connected to the first bridge via 121, and the second end of the bridge unit 12 is connected to the second bridge via 122. Similarly, assuming that the control end of the bridge unit 12 is connected to the scan line 102 of the (k+1)th touch display unit 10, the bridge unit 12 is also connected to the touch common electrodes of the adjacent two touch display units through the vias. The implementation manner is the same as that of Figure 8The embodiments shown are similar and will not be described again.

[0075] In an exemplary embodiment of the present disclosure, as shown in Figure 17 As shown, when the control end of the bridge unit 12 is connected to the scan line of the kth touch display unit 10, a second bridge via 122 is arranged at the touch common electrode 104 of the (k+1)th touch display unit 10; the first end of the bridge unit 12 is connected to the touch line 11 of the kth touch display unit 10, and the second end of the bridge unit 12 is connected to the second bridge via 122. As described above, the other end of the touch line 11 of the kth touch display unit 10 is connected to the touch common electrode 104 of the kth touch display unit 10, which is actually the first end of the bridge unit 12 connected to the touch common electrode 104 of the kth touch display unit 10. Therefore, compared with the embodiment shown in Figure 8 As shown, the embodiment can reduce the number of openings on each sub-pixel 101, and the touch line 11 of the kth touch display unit 10 and the bridge unit 12 are located on the same touch display unit 10 and are located on the side of the pixel electrode via 1012 away from the first drive transistor T1, and the distance between the touch line 11 and the bridge unit is shorter, and the line impedance R TX does not affect the effect of the bridge unit adjusting Vcom.

[0076] In an exemplary embodiment of the present disclosure, it is assumed that the touch line k of the kth touch display unit passes through the (k+1)th touch display unit, and the touch line k and the (k+1)th touch display unit are not connected. When the control end of the bridge unit 12 is connected to the scan line 102 of the (k+1)th touch display unit 10, the bridge unit 12 is arranged in the sub-pixel closest to the touch line k in the (k+1)th touch display unit, then the first end of the bridge unit 12 is connected to the touch line k, and the second end of the bridge unit 12 is connected to the second bridge via 122 of the (k+1)th touch display unit 10.

[0077] In an exemplary embodiment of the present disclosure, as shown in Figure 18As shown, the driving timing of the bridge unit 12 includes a display period and a touch detection period, wherein the display period refers to a period in which the data lines and scan lines corresponding to each sub-pixel in the touch display structure are controlled to enable the screen to display corresponding images; the touch detection period refers to a period in which it is detected whether a touch occurs on the screen. It should be understood that the display period and the touch detection period are alternately performed, and the two periods do not interfere with each other, so the bridge unit is configured to, when the driving timing of the scan line connected to the bridge unit is in the display period, control the first end of the bridge unit and the second end of the bridge unit to be turned on or turned off through the scan line connected to the bridge unit, at this time, the first end and the second end of the bridge unit being turned on does not affect the touch detection in the touch display period. However, if the first end and the second end of the bridge unit are turned on when the touch display structure is in the touch detection period, the touch common electrodes of the adjacent two touch display units are connected together through the bridge unit, which causes it to be unable to accurately detect whether the touch occurs in the kth touch display unit or the (k+1)th touch display unit, so the bridge unit is configured to, when the driving timing of the scan line connected to the bridge unit is in the touch detection period, the first end of the bridge unit and the second end of the bridge unit are kept off.

[0078] In an exemplary embodiment of the present disclosure, the working mode of the touch display unit 10 is distributed according to the time of touch detection, which can be divided into a horizontal long mode (Long H mode) and a vertical long mode (Long V mode). The horizontal long mode is to interrupt the charging during the pixel charging period in the display period to detect touch action, that is, this mode allows touch detection while image display, but may have a certain impact on display quality because the charging process is interrupted. The vertical long mode is to detect touch action in the vertical blanking interval (V Blanking interval), which is a short time interval from the end of each frame image display to the beginning of the next frame image display. In this time period, the screen does not display images, so touch sensing can be performed without affecting the display quality. As shown in FIG. 2, when the horizontal long mode is adopted, the display period is divided into display area one and display area two, and the interruption time in the middle is the touch detection period. In the display area one, the scan line voltage becomes low in turn, which means that the bridge unit is also gradually turned off, and then enters the touch detection period, at this time, the voltage Vcom and the scan line voltage are low-voltage sine wave or square wave signals, which does not affect the touch detection. During the display area two, similar to the display area one, because the scan line voltage will change from low to high, the bridge unit can be controlled to be in the on state. Figure 18 As shown in FIG. 2, when the horizontal long mode is adopted, the display period is divided into display area one and display area two, and the interruption time in the middle is the touch detection period. In the display area one, the scan line voltage becomes low in turn, which means that the bridge unit is also gradually turned off, and then enters the touch detection period, at this time, the voltage Vcom and the scan line voltage are low-voltage sine wave or square wave signals, which does not affect the touch detection. During the display area two, similar to the display area one, because the scan line voltage will change from low to high, the bridge unit can be controlled to be in the on state.

[0079] As shown in FIG. 2, when the horizontal long mode is adopted, the display period is divided into display area one and display area two, and the interruption time in the middle is the touch detection period. In the display area one, the scan line voltage becomes low in turn, which means that the bridge unit is also gradually turned off, and then enters the touch detection period, at this time, the voltage Vcom and the scan line voltage are low-voltage sine wave or square wave signals, which does not affect the touch detection. During the display area two, similar to the display area one, because the scan line voltage will change from low to high, the bridge unit can be controlled to be in the on state. Figure 19As shown, the liquid crystal display panel 21 can include a touch display structure 211, an opposed substrate 212, and liquid crystal molecules 213, the touch display structure 211 is provided in a cell with the opposed substrate 212, and the liquid crystal molecules 213 can be filled in a liquid crystal cell formed by the touch display structure 211 and the opposed substrate 212. The display device 2 can include the liquid crystal display panel 21 and a backlight module 22, the liquid crystal display panel 21 can be provided on a light emitting side of the backlight module 22, and the backlight module 22 provides a light source for the liquid crystal display panel 21.

[0080] According to the embodiments of the present application, the specific type of the display device is not particularly limited, and the display device types commonly used in the art can be used, for example, a television, a computer display, a mobile device such as a mobile phone and a notebook computer, a wearable device such as a watch, a VR device, and the like, and a person skilled in the art can select a corresponding display device according to the specific use of the display device, which will not be described here.

[0081] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0082] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and a person skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application, therefore any changes or modifications made according to the claims and the specification of the present application shall be within the scope of the present application.

Claims

1. A touch display structure, characterized in that, include: A substrate and multiple rows of touch display groups arranged sequentially on the substrate; The touch display group includes: K touch display units are arranged sequentially at intervals along the column direction. Each touch display unit includes a common touch electrode and multiple sub-pixels arranged in an array along the row and column directions. Each sub-pixel includes a pixel electrode. In the touch display unit, the orthographic projection of the pixel electrode of each sub-pixel on the substrate is located within the orthographic projection of the common touch electrode on the substrate. There are K touch lines, one end of the kth touch line is connected to the common touch electrode of the kth touch display unit, and the other end of the kth touch line is connected to a common voltage source; where K is an integer greater than 1, 1≤k≤K; A bridging unit is disposed between two adjacent touch display units. The bridging unit includes a first end, a second end, and a control end. In the two adjacent touch display units, the common touch electrode of one is connected to the first end of the bridging unit, and the common touch electrode of the other is connected to the second end of the bridging unit. The control end of the bridging unit is configured to turn the first end and the second end of the bridging unit on or off.

2. The touch display structure as described in claim 1, characterized in that, The touch display unit includes G rows of scan lines, and the sub-pixel includes a first driving transistor. In the sub-pixel: the pixel electrode is connected to the first terminal of the first driving transistor; the g-th scan line is connected to the control terminal of the first driving transistor of the corresponding sub-pixel; where G is an integer greater than 1, and 1≤g≤G. The control terminal of the bridging unit is connected to at least one of the scan lines in an adjacent touch display unit.

3. The touch display structure as described in claim 2, characterized in that, The bridging unit includes M second driving transistors, the control terminals of the M second driving transistors are connected to the Gth scan line of the kth touch display unit, or the control terminals of the M second driving transistors are connected to the first scan line of the (k+1)th touch display unit, where 1≤M≤G.

4. The touch display structure as described in claim 2, characterized in that, The bridging unit includes M second driving transistors; The control terminal of the (Mm)th second driving transistor is connected to the (Gm)th scan line of the kth touch display unit, where 0≤m<M≤G; Alternatively, the control terminal of the m-th second driving transistor is connected to the g-th scan line of the (k+1)-th touch display unit, where 1≤m≤M≤G and m=g.

5. The touch display structure as described in claim 2, characterized in that, When the control terminal of the bridging unit is connected to the scan line of the kth touch display unit, a first bridging via is provided on the touch common electrode of the kth touch display unit, and a second bridging via is provided on the touch common electrode of the (k+1)th touch display unit. The first end of the bridging unit is connected to the first bridging via, and the second end of the bridging unit is connected to the second bridging via.

6. The touch display structure as described in claim 2, characterized in that, When the control terminal of the bridging unit is connected to the scan line of the kth touch display unit, a second bridging via is provided on the touch common electrode of the (k+1)th touch display unit. The first end of the bridging unit is connected to the touch line of the k-th touch display unit, and the second end of the bridging unit is connected to the second bridging via.

7. The touch display structure as described in claim 2, characterized in that, In the sub-pixel: the pixel electrode includes a via end, and a pixel electrode via is provided on the via end; the second end of the first driving transistor is connected to the via end and the pixel electrode via. The bridging unit is located on the side of the pixel electrode via that is away from the first driving transistor, and the control terminal of the bridging unit and the control terminal of the first driving transistor are connected to the same scan line.

8. The touch display structure as described in claim 2, characterized in that, The driving timing of the scan lines includes a display cycle and a touch detection cycle; The bridging unit is configured to control the first end and the second end of the bridging unit to be turned on or off through the scan line connected to the bridging unit when the driving timing of the scan line connected to the bridging unit is in the display cycle. The bridging unit is configured such that when the driving timing of the scan line connected to the bridging unit is in the touch detection cycle, the first end and the second end of the bridging unit remain off.

9. A liquid crystal display panel, characterized in that, It includes a touch display structure as described in any one of claims 1-8, a counter substrate disposed opposite to the touch display structure, and liquid crystal molecules filling the space between the counter substrate and the touch display structure.

10. A display device, characterized in that, It includes the liquid crystal display panel and backlight module as described in claim 9, wherein the liquid crystal display panel is disposed on the light-emitting side of the backlight module.

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