Display panel, display device and manufacturing method

Abstract

The present application discloses a display panel, a display device and a manufacturing method, which relate to the field of display technology. In the case where the number of test leads is large, the number of test terminals can be reduced to avoid mutual influence between the test circuits connected to the test terminals, and the area occupied by the test terminals can be increased, thereby improving the accuracy of the test results. The display panel includes: a plurality of touch electrodes; a plurality of touch leads, the touch leads are electrically connected to the touch electrodes one by one; and test terminals, each of the test terminals being electrically connected to at least two of the touch electrodes through the touch leads.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display panel, a display device, and a manufacturing method thereof. Background Art

[0002] With the continuous development of display technology, touch technology is gradually integrated with display technology, and there is no need to set up a separate touch substrate in the display device to realize the touch function. The existing touch function is usually realized by touch electrodes, and the capacitance change of the touch electrode can reflect the user's touch position, thereby realizing the user's touch operation positioning.

[0003] However, in the existing test of touch electrodes, a test lead needs to be connected to each touch electrode. The number of test leads is large, and the number of corresponding test terminals is also large. Each test terminal occupies a small area, which easily causes mutual influence between the test circuits connected to the test terminals, thereby affecting the accuracy of the test results. Summary of the invention

[0004] The embodiments of the present application provide a display panel, a display device and a preparation method. When the number of test leads is large, the number of test terminals can be reduced to avoid mutual influence between the test circuits connected to the test terminals. The area occupied by the test terminals can also be increased, thereby improving the accuracy of the test results.

[0005] According to a first aspect of an embodiment of the present application, a display panel is provided, comprising:

[0006] A plurality of touch electrodes;

[0007] A plurality of touch leads, wherein the touch leads are electrically connected to the touch electrodes one by one;

[0008] Test terminals, each of which is electrically connected to at least two of the touch electrodes through the touch leads.

[0009] In some embodiments, the display panel further includes:

[0010] A reference electrode, the reference electrode is used to access a fixed potential;

[0011] The plurality of touch electrodes are arranged in an array, and the reference electrode is used to form a self-capacitive touch sensing device with each of the touch electrodes.

[0012] In some embodiments, the display panel further includes:

[0013] substrate layer;

[0014] A common electrode layer is disposed between the substrate layer and the touch electrode, and is used as the reference electrode.

[0015] In some embodiments, the display panel further includes:

[0016] Luminescent layer;

[0017] A cathode layer is disposed between the light-emitting layer and the touch electrode, and is used as the reference electrode.

[0018] In some implementations, the plurality of touch electrodes are divided into a plurality of test groups, one test group is electrically connected to one test terminal, and adjacent touch electrodes belong to different test groups.

[0019] In some implementations, the touch electrodes in each of the test groups are connected in series or in parallel via the touch leads, and the test terminal is connected between any two of the touch leads in the test group.

[0020] In some embodiments, the touch leads in each test group are connected end to end; or,

[0021] The touch leads in each test group are connected at one end close to the test terminal.

[0022] In some embodiments, the display panel further includes:

[0023] A switch device, wherein the test terminal is electrically connected to the touch electrode through the switch device.

[0024] In some embodiments, the display panel further includes:

[0025] A switching signal terminal is used to provide a switching signal to the switch device.

[0026] In some embodiments, the display panel further includes:

[0027] The driving function test device, the switching signal terminal is also used to provide a driving test signal to the driving function test device.

[0028] In some embodiments, the display panel and the switching device include a thin film transistor.

[0029] In some embodiments, the switch devices correspond to the touch electrodes one by one; or,

[0030] The switch devices correspond to the test terminals one by one; or,

[0031] One of the test terminals is electrically connected to at least two of the switch devices.

[0032] In some embodiments, the display panel further includes:

[0033] A touch control binding pin, wherein the touch control binding pin is used to bind a driver chip;

[0034] The touch binding pins are electrically connected to the touch electrodes in a one-to-one manner through the touch leads, and the test terminals are electrically connected to the touch electrodes through the touch binding pins.

[0035] In some embodiments, the touch binding pin is disposed between the touch electrode and the test terminal; and / or,

[0036] The switch device is arranged between the touch binding pin and the test terminal.

[0037] In some embodiments, the display panel further includes:

[0038] A chip input pin, the chip input pin is used to bind the driver chip, and the chip input pin is electrically connected to the touch binding pin through the driver chip;

[0039] A drive binding pin, the drive binding pin is used to bind the flexible circuit board, and the drive binding pin is electrically connected to the chip input pin;

[0040] The chip input pin is arranged between the drive binding pin arrangement and the touch binding pin, and the drive binding pin is arranged between the chip input pin and the test terminal.

[0041] In some embodiments, the display panel further includes:

[0042] A display binding pin, wherein the display binding pin is used to bind the driver chip;

[0043] The display device, the display binding pin is electrically connected to the display device.

[0044] According to a second aspect of an embodiment of the present application, a display device is provided, including:

[0045] A display panel as described in the first aspect.

[0046] In some embodiments, the display device further includes:

[0047] A driving chip is electrically connected to the display panel.

[0048] In some embodiments, the driving chip includes a display driving circuit and a touch driving circuit.

[0049] According to a third aspect of an embodiment of the present application, a method for preparing a display panel is provided, comprising:

[0050] providing a substrate base plate;

[0051] A plurality of touch electrodes, a plurality of touch leads and test terminals are respectively prepared on one side of the base substrate, wherein the touch leads are electrically connected to the touch electrodes one-to-one, and each of the test terminals is electrically connected to at least two of the touch electrodes through the touch leads.

[0052] In some embodiments, the method for preparing the display panel further includes:

[0053] Testing the electrical connection performance between the touch electrodes and the touch leads through the test terminals to perform a touch function test;

[0054] After the touch function test is completed, the area where the test terminals are located is cut off.

[0055] In view of the problems existing in the prior art, the display panel, display device and preparation method provided in the embodiments of the present application are provided with a one-to-one electrical connection between the touch leads and the touch electrodes, and each test terminal is electrically connected to at least two touch electrodes through the touch leads. When the number of touch electrodes remains unchanged, the number of required test terminals can be reduced, and the area of ​​a single test terminal can be ensured to be sufficient, and the test signal can be accurately transmitted, thereby ensuring the test accuracy. The number of test terminals is reduced, and the number of lines electrically connected to the test terminals is also reduced accordingly, making wiring easier, and the spacing between lines is increased, which can avoid signal interference between lines and further improve the touch test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present application;

[0057] Figure 2 A schematic diagram of the connection relationship between a touch electrode and a test terminal provided in an embodiment of the present application;

[0058] Figure 3 A schematic diagram of another connection relationship between a touch electrode and a test terminal provided in an embodiment of the present application;

[0059] Figure 4 A schematic diagram of a test terminal and a switching signal provided in an embodiment of the present application;

[0060] Figure 5 A schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0061] Figure 6 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0062] Figure 7 A schematic diagram of the structure of another display device provided in an embodiment of the present application;

[0063] Figure 8 A schematic flow chart of a method for preparing a display panel provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0065] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0066] With the continuous development of display technology, touch technology is gradually integrated with display technology, and there is no need to set up a separate touch substrate in the display device to realize the touch function. The existing touch function is usually realized by touch electrodes. The change in the capacitance of the touch electrode can reflect the user's touch position, thereby realizing the user's touch operation positioning. However, in the existing test of touch electrodes, the test lead needs to be connected to each touch electrode. The number of test leads is large, and the corresponding number of test terminals is also large, which easily causes mutual influence between the test circuits connected to the test terminals. Each test terminal occupies a small area, which affects the accuracy of the test results.

[0067] In view of this, the embodiments of the present application provide a display panel, a display device and a preparation method. When the number of test leads is large, the number of test terminals can be reduced to avoid mutual influence between the test circuits connected to the test terminals. The area occupied by the test terminals can also be increased, thereby improving the accuracy of the test results.

[0068] According to a first aspect of an embodiment of the present application, a display panel is provided. Figure 1 A schematic diagram of the structure of a display panel provided in an embodiment of the present application. Figure 1 As shown, the display panel provided by the embodiment of the present application includes: a plurality of touch electrodes 100; a plurality of touch leads 200, the touch leads 200 are electrically connected to the touch electrodes 100 one by one; and test terminals 300, each of which is electrically connected to at least two touch electrodes 100 through the touch leads 200. It should be noted that Figure 1 The number of touch electrodes 100, the number of touch leads 200 and the number of test terminals 300 shown are only for illustration and are not intended to be a specific limitation of the present invention. Usually, the touch electrodes 100 are disposed in the display area of ​​the display panel, and the test terminals 300 are disposed in the non-display area of ​​the display panel. Figure 1 The connection between each test terminal 300 and two touch electrodes 100 is only for illustration. Each test terminal 300 may also be connected to a plurality of touch electrodes 100, which is not specifically limited in the embodiment of the present application. Figure 1 The test terminals 300 shown may include a first test terminal TP1 , a second test terminal TP2 , and a third test terminal TP3 , and other test terminals 300 are not shown.

[0069] Exemplarily, during the test, since the touch electrodes 100 should be independent of each other, short-circuit resistance, insulation resistance, capacitance to ground, and capacitance of adjacent lines, etc. can be tested. For example, the capacitance and resistance between the first test terminal TP1 and the second test terminal TP2 can be tested, the capacitance and resistance between the second test terminal TP2 and the third test terminal TP3 can be tested, and the capacitance and resistance between the first test terminal TP1 and the third test terminal TP3 can also be tested. The measured resistance can be the short-circuit resistance and insulation resistance, and the measured capacitance can be the capacitance of adjacent lines. The capacitance and resistance can reflect whether there is a short circuit or a break between the line formed by the touch electrode 100 and the touch lead 200 and other lines, for example, whether there is a short circuit or a break between the line corresponding to the first test terminal TP1 and the line corresponding to the second test terminal TP2. Exemplarily, if the capacitance between the first test terminal TP1 and the second test terminal TP2 increases, there is a short circuit between the circuit corresponding to the first test terminal TP1 and the circuit corresponding to the second test terminal TP2 and other circuits, and the other circuits may be other drive circuits other than the test circuit or other test circuits other than the touch test, etc.; if the capacitance between the first test terminal TP1 and the second test terminal TP2 is 0, there is a disconnection or short circuit between the circuit corresponding to the first test terminal TP1 and the circuit corresponding to the second test terminal TP2; if the resistance between the first test terminal TP1 and the second test terminal TP2 is 0, there is a short circuit between the circuit corresponding to the first test terminal TP1 and / or the circuit corresponding to the second test terminal TP2. The touch electrode 100 provided in the embodiment of the present application can be used as a touch electrode in a self-capacitive touch sensing mode, or as a touch electrode in a mutual capacitance touch sensing mode, which is not specifically limited in the embodiment of the present application.

[0070] Usually, the touch sensing modes of the display panel include self-capacitance and mutual capacitance. The mutual capacitance touch sensing mode requires two touch electrodes, which are respectively used as the sensing electrode Rx and the transmission electrode Tx. One sensing electrode Rx and one transmission electrode Tx form a touch sensing sensor. The self-capacitance mode only requires one touch electrode, and the self-capacitance touch electrode forms a sensor with a fixed potential end. In the test process of the touch electrode, it is usually necessary to lead out a touch lead from each touch electrode, and one touch lead is connected to a test terminal. The electrical connection performance between the touch lead and the touch electrode is tested through the test terminal. The change in capacitance or value between the test terminals and the resistance and other parameters tested by the test terminals can be used to determine whether there is a short circuit between the touch electrodes, a disconnection between the touch electrode and the touch lead, and other problems. Since each touch electrode is connected to a test terminal through a touch lead, and the number of test terminals is the same as the number of touch electrodes, the arrangement of the test terminals will take up a large space. In order to reduce the border of the display panel or improve the layout utilization rate of the substrate glass during the preparation of the display panel, it is necessary to compress the area of ​​a single test terminal. The more test terminals there are, the smaller the area of ​​a single test terminal. The smaller the area of ​​the test terminal, the less conducive it is to the transmission of the test signal, and the higher the misalignment rate of the probe needle, the lower the test accuracy. The connection lines between the touch leads and the test terminals are relatively dense, which will cause signal interference between the lines and also lead to a decrease in test accuracy.

[0071] In addition, with the continuous development of display technology, in order to improve the integration of touch display devices, the TDDI (Touch and Display Driver Integration) chip combines the display panel driver chip and the touch driver chip into one chip, which has the characteristics of simple structure and cost saving. TDDI is the integration of touch and display drivers, using one IC (chip) to achieve joint control of touch and display. When using TDDI chips, the binding pins connecting TDDI to the display panel need to include binding pins connecting the touch electrodes and binding pins connecting the display devices, and the number of binding pins is greater than the number of binding pins of a single driver chip. The binding pins of the TDDI chip and the connecting lines of the test terminals are arranged in the non-display area on the display panel at the same time, which makes wiring more difficult.

[0072] In view of the problems existing in the prior art, the display panel provided by the embodiment of the present application is provided with a one-to-one electrical connection between the touch lead 200 and the touch electrode 100, and each test terminal 300 is electrically connected to at least two touch electrodes 100 through the touch lead 200. When the number of touch electrodes 100 remains unchanged, the number of required test terminals 300 can be reduced, and the area of ​​a single test terminal 300 can be ensured to be sufficient, and the test signal can be accurately transmitted, thereby ensuring the test accuracy. The number of test terminals 300 is reduced, and the number of lines electrically connected to the test terminals 300 is also reduced accordingly, making wiring easier, and the spacing between lines is increased, which can avoid signal interference between lines, and further improve the touch test accuracy.

[0073] Illustratively, the size of the touch electrode provided in the embodiment of the present application may be 4 mm×4 mm, and the minimum size may be 0.38 mm×0.38 mm, and may be set according to the size of the display panel and the application scenario, and the embodiment of the present application does not make any specific limitation.

[0074] In some implementations, the display panel provided in the embodiment of the present application further includes: a reference electrode, the reference electrode is used to connect to a fixed potential, the fixed potential may be ground or a fixed potential of other values, and the embodiment of the present application does not specifically limit this. Figure 1 As shown, multiple touch electrodes 100 are arranged in an array, and the reference electrode is used to form a self-capacitive touch sensing device with each touch electrode 100. Since the reference electrode is connected to a fixed potential, it can be used as a reference to form a touch sensing device with the touch electrode 100 to realize the touch sensing function.

[0075] Usually, in the existing mutual capacitance touch sensing mode, each row or column of touch electrodes shares a touch lead connected to the test terminal, that is, each row or column of touch electrodes is connected to the same test terminal, and the number of test terminals required is less than the number of test terminals required in the self capacitance touch sensing mode. Exemplarily, in the prior art, the number of touch sensing sensor devices set in the self capacitance touch sensing mode and the mutual capacitance touch sensing mode are both m×n, the number of test terminals required in the self capacitance touch sensing mode is m×n, and the number of test leads connected to the test terminals is also m×n; the number of test terminals required in the mutual capacitance touch sensing mode is m+n, and the number of test leads connected to the test terminals is also m+n. In the display panel provided in the embodiment of the present application, by setting each test terminal 300 to be electrically connected to at least two touch electrodes 100 through the touch lead 200, the number of test terminals 300 required can be less than m×n, and the number of test leads connected to the test terminals is also less than m×n. m can be a natural number greater than 0, and n can also be a natural number greater than 0.

[0076] The display panel provided by the embodiment of the present application can form a touch sensing device in a self-capacitance mode by setting a reference electrode and a touch electrode 100. In the self-capacitance touch sensing mode, the required test circuits are relatively large, and each touch electrode 100 needs to lead out a touch lead to be connected to the test terminal. Therefore, by electrically connecting each test terminal 300 to at least two touch electrodes 100 through a touch lead 200, the number of test terminals 300 can be reduced while the number of touch electrodes 100 remains unchanged, and the increase in the number of test terminals in the self-capacitance touch sensing mode can be avoided, thereby avoiding the reduction in the area of ​​a single test terminal, ensuring that the area of ​​a single test terminal 300 is sufficient, reducing the error rate of the test probe, and transmitting the test signal more accurately, thereby ensuring the test accuracy. The number of test terminals 300 is reduced, and the number of lines electrically connected to the test terminals 300 is also reduced accordingly, making wiring easier, and the spacing between lines is increased, which can avoid the generation of signal interference between lines, and further improve the touch test accuracy.

[0077] In some embodiments, the display panel provided in the embodiment of the present application further includes: a substrate layer; the substrate layer may be a flexible substrate or a rigid substrate, which is not specifically limited in the embodiment of the present application. A common electrode layer, the common electrode layer is arranged between the substrate layer and the touch electrode, and the common electrode layer is used as a reference electrode. The common electrode layer may be an electrode layer for driving the display device. Usually, the common electrode layer is arranged on the entire surface of the display panel, and the connected potential is fixed. It can be used as a reference electrode to form a self-capacitive touch sensing sensor device with the touch electrode. The display device is usually a thin film transistor and a circuit composed of a thin film transistor. The display panel provided in the embodiment of the present application may be a liquid crystal display panel or an organic light-emitting display panel, which is not specifically limited in the embodiment of the present application.

[0078] In some embodiments, the display panel provided in the embodiment of the present application further includes: a light-emitting layer; the light-emitting layer can be an organic light-emitting material, which is not specifically limited in the embodiment of the present application. A cathode layer, the cathode layer is arranged between the light-emitting layer and the touch electrode, and the cathode layer is used as a reference electrode. The display panel provided in the embodiment of the present application is an organic light-emitting display panel, and a light-emitting device can be provided. The light-emitting device generally includes an anode, a light-emitting layer and a cathode layer. The anode and the cathode layer can be used to drive the light-emitting layer to emit light. The anode is generally electrically connected to a driving device, and the driving device drives the anode. The cathode layer is connected to a fixed potential, which can realize driving the light-emitting layer to emit light and realize the display function. The cathode layer is generally arranged on the entire surface of the display panel, and can be used as a reference electrode in the self-capacitive touch sensing mode. The reference electrode can also be other structures or circuits that can provide a fixed potential, which is not specifically limited in the embodiment of the present application.

[0079] The display panel provided in the embodiment of the present application uses the common electrode layer as the reference electrode or the cathode layer as the reference electrode, and utilizes the structural characteristics of the entire surface of the common electrode layer and the cathode layer to form a self-capacitive touch sensing device with full coverage, and the touch function is more accurate. It can also realize the sharing of the existing structure of the display panel, without the need to set a reference electrode separately, simplifying the preparation process and saving costs.

[0080] In some implementations, the plurality of touch electrodes are divided into a plurality of test groups, one test group is electrically connected to one test terminal, and adjacent touch electrodes belong to different test groups.

[0081] For example, Figure 2 A schematic diagram of the connection relationship between a touch electrode and a test terminal provided in an embodiment of the present application. Figure 2 As shown, the touch electrodes 100 form a 6×6 array, and each touch electrode 100 in the array can be represented by an array coordinate (i, j), where 0<i≤6, 0<j≤6. Figure 2 Due to limited space, only the array coordinates of the touch electrodes 100 in the first and sixth columns are illustrated, and the remaining array coordinates are not illustrated. The array coordinates of the touch electrodes 100 in the first column are (1,1), (1,2), (1,3), (1,4), (1,5) and (1,6), and the array coordinates of the touch electrodes 100 in the sixth column are (6,1), (6,2), (6,3), (6,4), (6,5) and (6,6). The first test terminal TP1 is connected to the touch electrodes 100 corresponding to the array coordinates (1,6), (2,1), (3,6), (4,1), (5,6) and (6,1), and some of the array coordinates are in Figure 2 Not shown in the figure, all the touch electrodes 100 connected to the first test terminal TP1 are a test group, that is, each test terminal 300 is electrically connected to a test group, and adjacent touch electrodes 100 belong to different test groups, that is, all touch electrodes 100 in the same test group are not adjacent to each other, which can avoid signal interference between adjacent touch electrodes 100.

[0082] In some embodiments, the touch electrodes in each test group are connected in series or in parallel via touch leads, and the test terminal is connected between any two touch leads in the test group. Figure 2 As shown, the touch electrodes 100 in each test group can be regarded as being connected in series; with the test terminal 300 as the boundary, the touch electrodes 100 on both sides can be regarded as being connected in parallel.

[0083] In some embodiments, Figure 2 As shown, the touch leads in each test group are connected end to end. Figure 3This is another schematic diagram of the connection relationship between the touch electrodes and the test terminals provided in the embodiment of the present application. Figure 3 As shown, the touch leads 200 in each test group are connected at one end close to the test terminal 300. Figure 3 As shown, the touch electrodes 100 corresponding to the array coordinates (1,1) and (2,6) are connected to form a test group, the touch electrodes 100 corresponding to the array coordinates (1,2) and (2,5) are connected to form a test group, the touch electrodes 100 corresponding to the array coordinates (1,3) and (2,4) are connected to form a test group, the touch electrodes 100 corresponding to the array coordinates (1,4) and (2,3) are connected to form a test group, the touch electrodes 100 corresponding to the array coordinates (1,5) and (2,2) are connected to form a test group, and the touch electrodes 100 corresponding to the array coordinates (1,6) and (2,1) are connected to form a test group. Figure 2 As shown, each test group is connected with 6 test terminals 300. Figure 3 As shown, two test terminals 300 are connected in each test group. Figure 2 and Figure 3 The two connection relationships are merely illustrative and are not intended to be specific limitations of the embodiments of the present application.

[0084] The display panel provided in the embodiment of the present application can set the connection mode between the touch electrode 100 and the test terminal 300 according to the specific space size. Figure 2 The connection method shown can avoid the overlap of the connection lines corresponding to the test terminals. Figure 3 The connection method shown can save space on the opposite side of the display panel to the side where the test terminal is located, that is, it can reduce the size of the upper frame of the display panel and increase the screen-to-body ratio.

[0085] In some implementations, the display panel provided in the embodiments of the present application further includes: a switch device, through which the test terminal is electrically connected to the touch electrode. The opening and closing of the switch device can control the connection and disconnection of the corresponding test terminal and the touch electrode, that is, the on and off of the test circuit can be controlled, and the test circuit can be protected to prevent the test circuit from being damaged by non-test signals.

[0086] In some embodiments, the display panel provided in the embodiment of the present application further includes: a switching signal terminal, the switching signal terminal is used to provide a switching signal to the switch device. The switching signal can be used to control the opening or closing of the switch device to realize automatic control of the test circuit, so that the test operation can be automatically controlled.

[0087] In some embodiments, the display panel provided in the embodiment of the present application further includes: a driving function test device, and the switching signal terminal is also used to provide a driving test signal to the driving function test device. The driving function test device can be a test structure arranged in a non-display area of ​​the display panel, and the driving function test device can have the same structure as the driving device in the display area. During the preparation process of the display panel, the electrical properties of the driving function test device are tested online to reflect the electrical properties of the driving device in the display area, which can avoid the test process from causing damage to the driving device in the display area. The driving function test device and the driving device in the display area are prepared synchronously under the same process preparation conditions. Then the touch function test and the driving device function test can share the switching signal terminal, and can also share the test signal, that is, the switching signal is the same as the driving test signal, or it can be different, which is not specifically limited in the embodiment of the present application.

[0088] For example, Figure 4 A schematic diagram of a test terminal and a switching signal provided in an embodiment of the present application. Figure 4 As shown, each test terminal can correspond to 4 switching signals, namely the first switching signal ATSW1, the second switching signal ATSW2, the third switching signal ATSW3 and the fourth switching signal ATSW4. The switching enable signal ATEN can be used to control whether the current line is selected. Each test terminal needs to be connected to the corresponding touch electrode under the common control of the switching enable signal ATEN, the first switching signal ATSW1, the second switching signal ATSW2, the third switching signal ATSW3 and the fourth switching signal ATSW4. Usually, the first switching signal ATSW1, the second switching signal ATSW2, the third switching signal ATSW3 and the fourth switching signal ATSW4 are used in the driving function test. If the signals of the touch function test and the driving function test are shared, they can be synchronously connected to the test terminals.

[0089] In the display panel provided in the embodiment of the present application, the switching signal terminal can be simultaneously applied to the touch function test and the function test of the driving device, which can save the setting of a set of test terminals and save the space occupied by the non-display area.

[0090] In some embodiments, the switch device includes a thin film transistor. Usually, the driver device of the display panel adopts a thin film transistor. The switch device provided in the embodiment of the present application adopts a thin film transistor. The preparation process can be synchronized with the driver device in the display area and the thin film transistor in the driving circuit, which does not increase the process difficulty. As a switch device, a thin film transistor can achieve precise control and a simple control method.

[0091] In some embodiments, the switch devices correspond to the touch electrodes one by one. That is, a switch device is provided on the touch lead connected to each touch electrode, and each test terminal is connected to at least two switch devices. By controlling the switch devices, it is possible to control whether each touch electrode is connected to the test terminal, and a switching signal can be used to control all touch electrodes to be connected to the corresponding test terminal. The control method is simple and easy to implement.

[0092] In some embodiments, the switch device corresponds to the test terminal one-to-one, that is, at least two touch electrodes are connected to one switch device. The switch device is electrically connected to the test terminal one-to-one, and the corresponding test terminal can be controlled by controlling the corresponding switch device to control whether the test operation is performed. The number of switch devices is relatively small, which saves space, and the control method is easy to implement and the control logic is simple.

[0093] In some embodiments, one test terminal is electrically connected to at least two switch devices. Figure 4 As shown, each test terminal can correspond to multiple switch devices, each switch device realizes switch control by receiving a switching signal, and each switching signal corresponding to each test terminal needs to set a switch device. Figure 4 Each test terminal shown corresponds to 4 switching devices.

[0094] For example, Figure 5 This is a schematic diagram of the structure of another display panel provided in an embodiment of the present application. Figure 5 As shown, the switching device uses a thin film transistor TFT, the gate of the thin film transistor TFT is electrically connected to the switching signal terminal 900, and the switching signal terminal 900 can be used to transmit the switching signal SW, and the switching signal SW can control the opening or closing of the corresponding thin film transistor TFT. The thin film transistor TFT as the switching device is turned on during the touch function test, and the thin film transistor TFT as the switching device is turned off when the touch electrode 100 works normally.

[0095] In some embodiments, the touch electrode 100 is generally disposed in the display area AA, and the test terminal 300 is disposed in the non-display area. The display panel provided in the embodiment of the present application also includes: a touch binding pin 400, the touch binding pin 400 is used to bind the driver chip; the touch binding pin 400 is electrically connected to the touch electrode 100 one-to-one through the touch lead 200, and the test terminal 300 is electrically connected to the touch electrode 100 through the touch binding pin 400. The touch binding pin 400 is disposed between the touch electrode 100 and the test terminal 300; the switch device is disposed between the touch binding pin 400 and the test terminal 300. It is easy to understand that, if Figure 5 As shown, the source and drain of the thin film transistor TFT are connected between the test terminal 300 and the touch binding pin 400 .

[0096] In some embodiments, continue to refer to Figure 5 The display panel provided in the embodiment of the present application also includes: a chip input pin 500, the chip input pin 500 is used to bind the driver chip, and the chip input pin 500 is electrically connected to the touch binding pin 400 through the driver chip; a drive binding pin 600, the drive binding pin 600 is used to bind the flexible circuit board, and the flexible circuit board can be used to connect the mainboard of the display device. The drive binding pin 600 is electrically connected to the chip input pin 500; the chip input pin 500 is arranged between the drive binding pin 600 and the touch binding pin 400, and the drive binding pin 600 is arranged between the chip input pin 500 and the test terminal 300. Display binding pin 700, display binding pin 700 is used to bind the driver chip; display device, the display binding pin 700 is electrically connected to the display device, and the display device may include a driver device and a light-emitting device. The display panel provided in the embodiment of the present application can use a TDDI chip, and the display binding pin 700, the touch binding pin 400 and the chip input pin 500 can bind and connect the display panel with the TDDI chip, and the flexible circuit board can receive the display control signal, and the display control signal is transmitted to the drive circuit and display device of the display panel through the flexible circuit board, the drive binding pin 600, the chip input pin 500, the drive chip and the display binding pin 700 in sequence, and the touch signal sensed by the touch electrode 100 can be transmitted to the drive chip through the touch binding pin 400, and the drive chip can parse the touch signal to complete the touch function. The display panel can be provided with a cutting line 800, and the cutting line 800 can be set on the side of the drive binding pin 600 away from the touch electrode 100. After the touch function test is completed, the non-display area where the test terminal 300 is located can be cut off according to the cutting line 800, which can reduce the area ratio of the non-display area and increase the screen ratio.

[0097] It should be noted that the display panel provided in the embodiment of the present application can also use COF (IC on FPC) technology, that is, the IC is integrated on the FPC (flexible circuit board), and only one set of binding pins needs to be set, which is not specifically limited in the embodiment of the present application. The touch binding pins 400 and the touch binding pins 400 can be arranged in the same row and spaced apart, or they can be arranged in staggered rows. Figure 5 The positional relationship between the touch binding pins 400 and the touch binding pins 400 is only schematic and is not specifically limited in the embodiment of the present application.

[0098] According to a second aspect of the embodiments of the present application, a display device is provided. Figure 6 This is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Figure 6 As shown, the display device provided in the embodiment of the present application includes: the display panel 1000 as described in the first aspect.

[0099] The display device provided by the embodiment of the present application is provided with a one-to-one electrical connection between the touch lead and the touch electrode, and each test terminal is electrically connected to at least two touch electrodes through the touch lead. When the number of touch electrodes remains unchanged, the number of required test terminals can be reduced, and the area of ​​a single test terminal can be ensured to be sufficient, and the test signal can be accurately transmitted, thereby ensuring the test accuracy. The number of test terminals is reduced, and the number of lines electrically connected to the test terminals is also reduced accordingly, making wiring easier, and the spacing between lines is increased, which can avoid signal interference between lines, and further improve the touch test accuracy.

[0100] In some embodiments, Figure 7 This is a schematic diagram of the structure of another display device provided in an embodiment of the present application. Figure 7 As shown, the display device provided in the embodiment of the present application further includes: a driving chip 2000, and the driving chip 2000 is electrically connected to the display panel 1000. The driving chip includes a display driving circuit and a touch driving circuit, that is, the driving chip can adopt a TDDI chip, and the display driving function and the touch driving function can be integrated into one chip.

[0101] According to a third aspect of the embodiments of the present application, a method for preparing a display panel is provided. Figure 8 The following is a schematic flow chart of a method for manufacturing a display panel provided in an embodiment of the present application. Figure 8 As shown, the method for preparing a display panel provided in an embodiment of the present application includes:

[0102] S101: Provide a base substrate. The base substrate may be a base layer, or the base layer may be disposed on the base substrate, which is not specifically limited in the embodiment of the present application.

[0103] S102: preparing a plurality of touch electrodes, a plurality of touch leads and test terminals on one side of the substrate, wherein the touch leads are electrically connected to the touch electrodes one-to-one, and each test terminal is electrically connected to at least two touch electrodes through the touch leads.

[0104] The manufacturing method of the display panel provided in the embodiment of the present application sets a one-to-one electrical connection between the touch lead and the touch electrode, and each test terminal is electrically connected to at least two touch electrodes through the touch lead. When the number of touch electrodes remains unchanged, the number of required test terminals can be reduced, and the area of ​​a single test terminal can be guaranteed to be sufficient, and the test signal can be accurately transmitted, thereby ensuring the test accuracy. The number of test terminals is reduced, and the number of lines electrically connected to the test terminals is also reduced accordingly, making wiring easier, and the spacing between lines is increased, which can avoid signal interference between lines, and further improve the touch test accuracy.

[0105] In some embodiments, the method for preparing a display panel provided in the embodiments of the present application further includes:

[0106] The electrical connection performance of the touch electrodes and the touch leads is tested through the test terminals to perform a touch function test. After the test is completed, the test terminals are useless and no longer need to be retained on the display panel.

[0107] After the touch function test is completed, the area where the test terminals are located is cut off. The area where the test terminals are located can be cut off along the cutting line 800. Figure 5 The non-display area where the test terminal 300 is located can be cut off according to the cutting line 800, which can reduce the area ratio of the non-display area and increase the screen ratio.

[0108] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0109] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0110] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A display panel, characterized in that: include: A plurality of touch electrodes; A plurality of touch leads, wherein the touch leads are electrically connected to the touch electrodes one by one; Test terminals, each of which is electrically connected to at least two of the touch electrodes through the touch leads; The plurality of touch control electrodes are divided into a plurality of test groups, one test group is electrically connected to one test terminal, and adjacent touch control electrodes belong to different test groups; The touch electrodes in each test group are connected in series or in parallel through the touch leads, and the test terminal is connected between any two touch leads in the test group; The touch leads in each test group are connected end to end; or, The touch leads in each test group are connected at one end close to the test terminal.

2. The display panel according to claim 1, characterized in that: Also includes: A reference electrode, the reference electrode is used to access a fixed potential; The plurality of touch electrodes are arranged in an array, and the reference electrode is used to form a self-capacitive touch sensing device with each of the touch electrodes.

3. The display panel according to claim 2, characterized in that: Also includes: substrate layer; A common electrode layer is disposed between the substrate layer and the touch electrode, and is used as the reference electrode.

4. The display panel according to claim 2, characterized in that: Also includes: Luminescent layer; A cathode layer is disposed between the light-emitting layer and the touch electrode, and is used as the reference electrode.

5. The display panel according to any one of claims 1 to 4, characterized in that: Also includes: A switch device, wherein the test terminal is electrically connected to the touch electrode through the switch device.

6. The display panel according to claim 5, characterized in that: Also includes: A switching signal terminal is used to provide a switching signal to the switch device.

7. The display panel according to claim 6, characterized in that: Also includes: The driving function test device, the switching signal terminal is also used to provide a driving test signal to the driving function test device.

8. The display panel according to claim 5, characterized in that: The switching device includes a thin film transistor.

9. The display panel according to claim 5, characterized in that: The switch devices correspond to the touch electrodes one by one; or, The switch devices correspond to the test terminals one by one; or, One of the test terminals is electrically connected to at least two of the switch devices.

10. The display panel according to claim 5, characterized in that: Also includes: A touch control binding pin, wherein the touch control binding pin is used to bind a driver chip; The touch binding pins are electrically connected to the touch electrodes in a one-to-one manner through the touch leads, and the test terminals are electrically connected to the touch electrodes through the touch binding pins.

11. The display panel according to claim 10, characterized in that: The touch binding pin is arranged between the touch electrode and the test terminal; and / or, The switch device is arranged between the touch binding pin and the test terminal.

12. The display panel according to claim 10, characterized in that: Also includes: A chip input pin, the chip input pin is used to bind the driver chip, and the chip input pin is electrically connected to the touch binding pin through the driver chip; A drive binding pin, the drive binding pin is used to bind the flexible circuit board, and the drive binding pin is electrically connected to the chip input pin; The chip input pin is arranged between the drive binding pin arrangement and the touch binding pin, and the drive binding pin is arranged between the chip input pin and the test terminal.

13. The display panel according to claim 10, characterized in that: Also includes: A display binding pin, wherein the display binding pin is used to bind the driver chip; The display device, the display binding pin is electrically connected to the display device.

14. A display device, characterized in that: include: A display panel as claimed in any one of claims 1 to 13.

15. The display device according to claim 14, characterized in that: Also includes: A driving chip is electrically connected to the display panel.

16. The display device according to claim 15, characterized in that: The driving chip includes a display driving circuit and a touch driving circuit.

17. A method for preparing a display panel, characterized in that: For preparing a display panel according to any one of claims 1 to 13, the method comprising: providing a substrate base plate; A plurality of touch electrodes, a plurality of touch leads and test terminals are respectively prepared on one side of the base substrate, wherein the touch leads are electrically connected to the touch electrodes one-to-one, and each of the test terminals is electrically connected to at least two of the touch electrodes through the touch leads; The plurality of touch control electrodes are divided into a plurality of test groups, one test group is electrically connected to one test terminal, and adjacent touch control electrodes belong to different test groups; The touch electrodes in each test group are connected in series or in parallel through the touch leads, and the test terminal is connected between any two touch leads in the test group; The touch leads in each test group are connected end to end; or, The touch leads in each test group are connected at one end close to the test terminal.

18. The method for preparing a display panel according to claim 17, characterized in that: Also includes: Testing the electrical connection performance between the touch electrodes and the touch leads through the test terminals to perform a touch function test; After the touch function test is completed, the area where the test terminals are located is cut off.

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