Display substrate and display device

Abstract

The embodiments of the present disclosure provide a display substrate and a display device, wherein the display substrate includes a display area and a binding area located on one side of the display area, and the display substrate includes: a substrate; an auxiliary electrode layer, which is arranged on the substrate; a plurality of light-emitting devices, which are arranged on the substrate and located in the display area, and the light-emitting devices include a first electrode, a light-emitting layer, and a second electrode, which are arranged in sequence in a direction away from the substrate, and the second electrodes of the plurality of light-emitting devices are connected to form a second electrode layer, and the orthographic projection of the auxiliary electrode layer on the substrate at least partially overlaps with the orthographic projection of the second electrode layer on the substrate; a first connecting electrode, which is located in the binding area and is used to connect to a first signal terminal; the first connecting electrode is electrically connected to the second electrode layer; a second connecting electrode, which is located in the binding area and is used to connect to a second signal terminal, and is connected to the auxiliary electrode layer.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display substrate and a display device. Background Art

[0002] Traditional OLED (Organic Light-Emitting Diode) display panels with touch functions require an external touch module, which results in a large overall thickness of the display panel, which is not conducive to the folding performance improvement and functional integration of flexible OLED display panels. The emergence of FMLOC (Flexible Multi-Layer On Cell) technology, which directly prepares the touch film group on the OLED display substrate, solves this problem and helps reduce the thickness of the product. Summary of the invention

[0003] Embodiments of the present disclosure provide a display substrate and a display device.

[0004] In a first aspect, an embodiment of the present disclosure provides a display substrate, the display substrate comprising a display area and a binding area located on one side of the display area, the display substrate comprising:

[0005] substrate;

[0006] an auxiliary electrode layer, wherein the auxiliary electrode layer is disposed on the substrate;

[0007] A plurality of light-emitting devices are arranged on the substrate and located in the display area, the light-emitting devices include a first electrode, a light-emitting layer, and a second electrode arranged in sequence in a direction away from the substrate, the second electrodes of the plurality of light-emitting devices are connected to form a second electrode layer, and the orthographic projection of the auxiliary electrode layer on the substrate at least partially overlaps with the orthographic projection of the second electrode layer on the substrate;

[0008] A first connecting electrode is located in the binding area, and the first connecting electrode is used to connect to the first signal terminal; the first connecting electrode is electrically connected to the second electrode layer;

[0009] The second connecting electrode is located in the binding area, the second connecting electrode is used to connect to the second signal terminal, and the second connecting electrode is connected to the auxiliary electrode layer.

[0010] In some embodiments, the display substrate further includes an encapsulation layer and a touch electrode layer;

[0011] The encapsulation layer is located on a side of the plurality of light-emitting devices away from the substrate;

[0012] The touch electrode layer is located on a side of the packaging layer away from the light-emitting device, and an orthographic projection of the touch electrode layer on the substrate partially overlaps with an orthographic projection of the second electrode layer on the substrate.

[0013] In some embodiments, an orthographic projection of the auxiliary electrode layer on the substrate is consistent with an orthographic projection of the touch electrode layer on the substrate.

[0014] In some embodiments, the auxiliary electrode layer is disposed on a side of the substrate away from the plurality of light-emitting devices, and the second connecting electrode is connected to the auxiliary electrode layer via a conductive member penetrating the substrate.

[0015] In some embodiments, a via is provided on the substrate, and the conductive member includes a conductive glue located in the via.

[0016] In some embodiments, the display substrate further includes an insulating layer, and the insulating layer is located on a side of the auxiliary electrode layer away from the substrate.

[0017] In some embodiments, the first connecting electrode and the second connecting electrode are disposed in the same layer.

[0018] In some embodiments, the display substrate further includes a thin film transistor,

[0019] The thin film transistor is located between the light emitting device and the substrate, the first electrode of the light emitting device is connected to the drain of the thin film transistor, and the first connecting electrode and the second connecting electrode are made of the same material as the source and drain of the thin film transistor.

[0020] In a second aspect, an embodiment of the present disclosure provides a display device comprising the display substrate and driving circuit mentioned above; the driving circuit is electrically connected to the first signal terminal and the second signal terminal, and is configured to: provide a constant voltage first voltage signal to the first signal terminal; and provide a second voltage signal to the second signal terminal.

[0021] In some embodiments, the display substrate includes a plurality of pixels, each of which is provided with the light-emitting device; the driving circuit is further configured to: provide display signals to the pixels line by line according to image information of the target image;

[0022] The target image includes a stripe image, the stripe image includes a plurality of first sub-images and a plurality of second sub-images, the first sub-images and the second sub-images each correspond to at least one row of pixels, the first sub-images and the second sub-images are arranged alternately, and the grayscale of the first sub-image is greater than the grayscale of the second sub-image; when the driving circuit provides a display signal to a pixel corresponding to the first sub-image, the second voltage signal is at a first level; when the driving circuit provides a display signal to a pixel corresponding to the second sub-image, the second voltage signal is at a second level, and the first level is less than the second level;

[0023] The difference between the first level and the second level is between 0.8V and 1.2V;

[0024] Alternatively, the target image includes a non-stripe image, and the second voltage signal is a signal of a fixed potential. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0026] Figure 1 The figure is a schematic diagram of the structure of a display substrate.

[0027] Figure 2 It is a schematic plan view of the touch electrode layer of the display substrate.

[0028] Figure 3 It is a schematic diagram showing the influence of the data signal of the display substrate on the touch signal.

[0029] Figure 4 A schematic structural diagram of a display substrate provided in an embodiment of the present disclosure.

[0030] Figure 5 A schematic structural diagram of another display substrate provided in an embodiment of the present disclosure.

[0031] Figure 6 A timing diagram of a scan signal and a touch signal of a display substrate provided in an embodiment of the present disclosure.

[0032] Figure 7 A timing diagram of a data signal, a first voltage signal and a second voltage signal of a display substrate provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0033] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0035] Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] Traditional OLED (Organic Light-Emitting Diode) display panels with touch functions require an external touch module, which results in a large overall thickness of the display panel, which is not conducive to the folding performance improvement and functional integration of flexible OLED display panels. The emergence of FMLOC (Flexible Multi-Layer On Cell) technology, which directly prepares the touch film group on the OLED display substrate, solves this problem.

[0037] Figure 1 is a schematic diagram of the structure of a display substrate, such as Figure 1As shown, the display substrate includes a substrate 1 and a thin film transistor 2, a planarization layer PLN, a plurality of light emitting devices 3, an encapsulation layer 4 and a touch electrode layer 5 arranged in sequence in a direction away from the substrate 1. Among them, a plurality of gate lines and a plurality of data lines are arranged on the substrate 1, and the plurality of gate lines and the plurality of data lines intersect to define a plurality of pixels, and a thin film transistor 2 and a light emitting device 3 are arranged in each pixel. Each light emitting device 3 includes an anode 31, a light emitting layer 32 and a cathode 33 arranged in sequence in a direction away from the thin film transistor 2, and the cathodes of the plurality of light emitting devices 3 are connected as a whole layer. The thin film transistor 2 includes a source 21, a drain 22, a gate 23 and an active layer 24, and the active layer 24 is located between the gate 23 and the substrate 1, and the active layer 24 includes a channel portion and a source connection portion and a drain connection portion located on both sides of the channel portion, the source connection portion is connected to the source 21, and the drain connection portion is connected to the drain 22, and the anode 31 of the light emitting device 3 is connected to the drain 22 through a via hole on the planarization layer PLN. The multiple data lines are arranged in the same layer as the source 21 / drain 22 in the thin film transistor 2. The encapsulation layer 4 is located between the light emitting device 3 and the touch electrode layer 5. The touch electrode layer 5 is located on the side of the encapsulation layer 4 away from the substrate 1 and is used to detect the occurrence of touch.

[0038] Figure 2 is a schematic plan view of the touch electrode layer of the display substrate, such as Figure 2 As shown, the touch electrode layer includes a plurality of parallel touch driving electrodes Tx and a plurality of parallel touch sensing electrodes Rx. The touch sensing electrodes Rx are arranged crosswise with each touch driving electrode Tx, so as to form a capacitor at the intersection of the two electrodes. When the driving circuit 10 passes a driving signal to each touch driving electrode in turn in the form of scanning, a corresponding sensing signal will also be generated on each touch sensing electrode Rx. When a touch occurs, the touch point will produce electrode discharge, change in distance between electrodes, change in dielectric constant between electrodes, etc., thereby causing the capacitance at that point to also change. Therefore, when the corresponding touch driving electrode Tx is scanned, the sensing signal on the touch sensing electrode Rx corresponding to the touch point will also change, so that the touch position can be determined and touch can be achieved.

[0039] During the operation of the display substrate, display and touch are performed simultaneously, and the above-mentioned driving circuit is configured to provide a display signal for each pixel, and the display signal includes a data signal and a scan signal. Specifically, the driving circuit provides a scan signal to the pixels row by row, so that the pixels are turned on row by row. Each time a scan signal is provided to one row of pixels, a data signal is provided to multiple data lines, so that the data signal is written into a row of pixels scanned, thereby driving the light-emitting device to emit light. At the same time, the driving circuit is also configured to provide a touch signal to the touch electrode layer 5.

[0040] Since the orthographic projection of the thin film transistor 2 on the substrate 1 at least partially overlaps with the orthographic projection of the cathode layer 33 in the light emitting device 3 on the substrate 1, similarly, the orthographic projection of the data line or the gate line on the substrate 1 at least partially overlaps with the orthographic projection of the cathode layer 33 in the light emitting device 3 on the substrate 1, and the data line, the source 21 and the drain 22 of the thin film transistor 2 are located in the same film layer, and are spaced a short distance from the cathode layer 33 in the thickness direction of the substrate 1, therefore, during the display process of the display substrate, both the data signal and the scanning signal will generate coupling signals to the cathode layer, causing interference.

[0041] In addition, since the driving circuit provides a touch signal when providing a scan signal and a data signal; and Figure 1 The spacing between the cathode layer 33 and the touch electrode layer 5 in the thickness direction of the substrate 1 is also relatively small, so the coupling signal on the cathode layer 33 will also affect the touch electrode layer 5, further generating noise on the touch signal and affecting the touch function.

[0042] Figure 3 It is a schematic diagram showing the influence of the data signal of the display substrate on the touch signal, wherein: Figure 3 The data signal shown in the figure is a data signal when displaying a stripe image. The stripe image includes a plurality of first sub-images and a plurality of second sub-images, each of the first sub-image and the second sub-image corresponds to at least one row of pixels, the first sub-image and the second sub-image are alternately arranged, and the grayscales are different. In one example, each of the first sub-image and the second sub-image corresponds to a row of pixels, the first sub-image is a white screen, and the second sub-image is a black screen. At this time, the stripe image is a screen with one row of black and one row of white (1W1B), wherein the data signal on each data line is as follows: Figure 3 As shown in the Data in the figure, the data signal is constantly jumping between high and low levels. At each jump, that is, at the rising and falling edges of the data signal, a spike wave appears on the touch signal, which is the noise generated on the touch signal. When the data signal changes from a low level to a high level, it has a positive effect on the touch signal and generates positive noise; when the data signal changes from a high level to a low level, it has a negative effect on the touch signal and generates negative noise. For the stripe image, the signal waveform on each data line is basically the same, so the noise brought to the touch signal is particularly obvious. Figure 3 The noise intensity on the touch signal caused by the data signal is about 1.2 V, and the period of the data signal or the touch signal is t', which may be between 1.8 and 3 μs.

[0043] In order to solve at least one of the above technical problems, an embodiment of the present disclosure provides a display substrate for reducing or eliminating the noise of a touch signal on a touch electrode.

[0044] Figure 4A schematic diagram of the structure of a display substrate provided in an embodiment of the present disclosure is shown in FIG. Figure 4 As shown, the display substrate includes a display area AA and a binding area NA located at one side of the display area. The display substrate includes: a substrate 1, an auxiliary electrode layer 6, a plurality of light emitting devices 3, a first connection electrode 7 and a second connection electrode 8.

[0045] A plurality of gate lines and a plurality of data lines may be arranged on the substrate 1 , and the plurality of gate lines and the plurality of data lines intersect to define a plurality of pixels, and a light emitting device 3 is arranged in each pixel.

[0046] Among them, the auxiliary electrode layer 6 is arranged on the substrate 1; a plurality of light-emitting devices 3 are arranged on the substrate 1 and are located in the display area, the light-emitting devices 3 include a first electrode 31, a light-emitting layer 32 and a second electrode 331 arranged in sequence in a direction away from the substrate 1, the second electrodes 331 of the plurality of light-emitting devices 3 are connected to form a second electrode layer 33, and the orthographic projection of the auxiliary electrode layer 6 on the substrate 1 at least partially overlaps with the orthographic projection of the second electrode layer 33 on the substrate 1.

[0047] The first connection electrode 7 and the second connection electrode 8 are both located in the binding area NA, wherein the first connection electrode 7 is used to connect to the first signal terminal; the second electrode layer 33 is electrically connected to the first connection electrode 7; the second connection electrode 8 is used to connect to the second signal terminal, and the second connection electrode 8 is connected to the auxiliary electrode layer 6. The first connection electrode 7 and the second connection electrode 8 can both be connected to the flexible circuit board by bonding, the first connection electrode 7 is connected to the first signal terminal on the driving circuit board through the flexible circuit board, and the second connection electrode 8 is connected to the second signal terminal on the driving circuit board through the flexible circuit board.

[0048] It should be noted that Figure 4 Only one cross section of the display substrate is schematically presented, and at other cross-sectional positions, a portion of the first connection electrode 7 may be exposed by the film layer above it, so as to be bound and connected to the flexible circuit board.

[0049] The display substrate provided by the embodiment of the present disclosure has an auxiliary electrode layer 6 arranged on the substrate 1, the auxiliary electrode layer 6 is connected to the first connection electrode 7, the second electrode layer 33 is connected to the second connection electrode 8, and the first connection electrode 7 and the second connection electrode 8 are connected to different signal terminals. In the case where a touch electrode layer is arranged in the display substrate, during the display process of the display substrate, a sudden change of the data signal of the display substrate will cause noise in the touch signal on the touch electrode layer. In this case, an electric signal can be provided to the second signal terminal. Since the orthographic projection of the auxiliary electrode layer 6 on the substrate 1 and the orthographic projection of the second electrode layer 33 on the substrate 1 at least partially overlap, the electric signal on the auxiliary electrode layer 6 will also affect the touch electrode layer. By adjusting the size or timing of the electric signal on the auxiliary electrode layer 6, the interference of the data signal on the touch signal and the interference of the signal on the auxiliary electrode layer 6 on the touch signal can be offset, thereby reducing or eliminating the noise of the touch signal and improving the touch accuracy.

[0050] It should be noted that the light-emitting device 3 provided in the embodiment of the present disclosure is a top-emitting light-emitting device. Optionally, the first electrode 31 is a cathode, which may be a reflective electrode made of a metal material, and the second electrode is an anode, which may be a transparent electrode made of a transparent conductive material (e.g., indium tin oxide). Of course, the light-emitting device 3 may also be a bottom-emitting light-emitting device.

[0051] In addition, the material of the auxiliary electrode layer 6 may be a single layer or multiple layers of metal, alloys, metal nitrides, conductive metal oxides, transparent conductive materials, etc., which is not limited in the embodiments of the present disclosure.

[0052] In some embodiments, Figure 4 As shown, the display substrate further includes an encapsulation layer 4 and a touch electrode layer 5. The encapsulation layer 4 is located on the side of the plurality of light-emitting devices 3 away from the substrate 1; the touch electrode layer 5 is located on the side of the encapsulation layer 4 away from the light-emitting devices 3, and the orthographic projection of the touch electrode layer 5 on the substrate 1 partially overlaps with the orthographic projection of the second electrode layer 33 on the substrate 1, so the interference generated by the data signal on the second electrode layer 33 will continue to be transmitted to the touch electrode layer 5 through the second electrode layer 33. However, the orthographic projection of the auxiliary electrode layer 6 on the substrate 1 partially overlaps with the orthographic projection of the second electrode layer 33 on the substrate 1, so by adjusting the size or timing of the electrical signal on the auxiliary electrode layer 6, the interference of the data signal on the touch signal and the interference of the signal on the auxiliary electrode layer 6 on the touch signal can be offset, thereby reducing or eliminating the noise of the touch signal and avoiding poor touch.

[0053] In some embodiments, the orthographic projection of the auxiliary electrode layer 6 on the substrate 1 is consistent with the orthographic projection of the touch electrode layer 5 on the substrate 1. Since the touch electrode layer 5 includes a plurality of patterned metal electrodes, for example, a plurality of touch driving electrodes extending in the horizontal direction and a plurality of touch sensing electrodes extending in the vertical direction, the auxiliary electrode layer 6 can be patterned, that is, the auxiliary electrode layer 6 having the same pattern as the touch electrode layer 5 is formed, thereby saving material resources and eliminating the interference of the data signal on the touch electrode layer 5 to avoid poor touch.

[0054] In one example, if Figure 4 As shown, the display substrate also includes: a pixel defining layer PDL, and a buffer layer BUF, a first gate insulating layer GI1, a second gate insulating layer GI2, an interlayer insulating layer ILD, a thin film transistor 2 and a planarization layer PLN, which are located between the substrate 1 and the light-emitting device 3 and are arranged in sequence along a direction away from the substrate 1.

[0055] The pixel defining layer PDL is located on a side of the first electrode 31 away from the substrate 1 and has a plurality of openings, and the light emitting devices 3 are arranged in the openings one by one. The light emitting devices 3 are arranged in the openings one by one, specifically, a portion of the first electrode 31 is exposed by the opening, the light emitting layer 32 is arranged in the opening, and the second electrodes of the plurality of light emitting devices 3 form an integrated structure, namely, the second electrode layer 33.

[0056] The thin film transistor 2 includes a gate 23, an active layer 23, a source 21 and a drain 22. A via is provided on the planarization layer PLN, and the first electrode 31 is connected to the drain 22 of the thin film transistor 2 through the via. Taking the thin film transistor 2 as a top gate thin film transistor, the gate 23 is located on the side of the active layer 23 away from the substrate 1, and the source 21 and the drain 22 are located on the side of the gate 23 away from the substrate 1. The material of the active layer 23 may include, for example, inorganic semiconductor materials (for example, polycrystalline silicon, amorphous silicon, etc.), organic semiconductor materials, and oxide semiconductor materials. The active layer 23 includes a channel portion and a source connection portion and a drain 22 connection portion located on both sides of the channel portion, the source connection portion is connected to the source 21 of the thin film transistor 2, and the drain 22 connection portion is connected to the drain 22 of the thin film transistor 2. Both the source connection portion and the drain connection portion may be doped with impurities (for example, N-type impurities or P-type impurities) with a higher impurity concentration than the channel portion. The channel portion is directly opposite to the gate electrode 23 of the thin film transistor 2 . When the voltage signal loaded on the gate electrode 23 reaches a certain value, a carrier path is formed in the channel portion, so that the source electrode 21 and the drain electrode 22 of the thin film transistor 2 are turned on.

[0057] The buffer layer BUF is located between the substrate 1 and the thin film transistor 2, and is used to prevent or reduce metal atoms and / or impurities from diffusing from the substrate 1 into the active layer 24 of the thin film transistor 2. The buffer layer BUF may include an inorganic material such as silicon oxide, silicon nitride and / or silicon oxynitride, and may be formed as a multilayer or a single layer.

[0058] The first gate insulating layer GI1 is located between the active layer 24 and the gate electrode 23 of the thin film transistor 2; the second gate insulating layer GI2 and the interlayer insulating layer ILD are located between the gate electrode 23 and the source electrode 21 of the thin film transistor 2, and the interlayer insulating layer ILD is located on the side of the second gate insulating layer GI2 away from the substrate 1. The materials of the first gate insulating layer GI1, the second gate insulating layer GI2 and the interlayer insulating layer ILD may include silicon compounds or metal oxides, and may be formed into a single layer or multiple layers, which is not limited in the embodiments of the present disclosure.

[0059] The gate electrode layer is arranged on the side of the first gate insulating layer GI1 away from the substrate 1. Among them, the gate electrode layer includes the gate 23 of each thin film transistor 2 and the first electrode plate of the capacitor. In addition, the second electrode plate of the capacitor (not shown in the figure) is arranged on the side of the second gate insulating layer GI2 away from the substrate 1, and is connected to the source 21 of the thin film transistor 2, and its material can be the same as the material of the first electrode plate. The material of the gate electrode layer may include, for example, metal, metal alloy, metal nitride, conductive metal oxide, transparent conductive material, etc. For example, the gate electrode layer may include gold, gold alloy, silver, silver alloy, aluminum, aluminum alloy, aluminum nitride, tungsten, tungsten nitride, copper, copper alloy, nickel, chromium, chromium nitride, molybdenum, molybdenum alloy, titanium, titanium nitride, platinum, tantalum, tantalum nitride, neodymium, scandium, strontium ruthenium oxide, zinc oxide, tin oxide, indium oxide, gallium oxide, indium tin oxide, indium zinc oxide, etc. The gate electrode layer may have a single layer or multiple layers.

[0060] In some embodiments, the auxiliary electrode layer 6 is disposed on a side of the substrate 1 away from the plurality of light-emitting devices 3, and the second connection electrode 8 is connected to the auxiliary electrode layer 6 via a conductive member 80 that penetrates the substrate 1. At the same time, the second connection electrode 8 is also connected to the second signal terminal to provide an electrical signal to eliminate interference signals on the second electrode layer 33 and the touch electrode layer 5, thereby improving the touch effect and avoiding poor touch of the display substrate.

[0061] In some embodiments, a via hole is provided on the substrate 1, and the conductive member 80 includes a conductive glue located in the via hole. The conductive glue may include irregularly shaped conductive particles. In the manufacturing process of the display substrate, the conductive glue particles of irregular shapes may be arranged in the via hole that at least penetrates the substrate 1, and the pressure is set to 0.2 Pa, the temperature is set to 290° C., and the time is set to 16 s. By applying pressure, the electrical connection between the second connection electrode 8 and the auxiliary electrode layer 6 is achieved.

[0062] In one example, if Figure 4 As shown, the second connection electrode 8 can be located on the side of the substrate 1 away from the auxiliary electrode layer 6. In other examples, the second connection electrode 8 can be arranged at any position between the light-emitting device 3 and the substrate 1, that is, the second connection electrode 8 is located on the side of the first film layer away from the auxiliary electrode layer 6, and the above-mentioned first film layer can be any layer of the buffer layer BUF, the first gate insulation layer GI1, the second gate insulation layer GI2, the interlayer insulation layer ILD and the planarization layer PLN. For example, the second connection electrode 8 is located on the side of the buffer layer BUF away from the substrate 1, and the second connection electrode 8 is connected to the auxiliary electrode layer 6 through the conductive member 80 penetrating the buffer layer BUF and the substrate 1; or, the second connection electrode 8 is located on the side of the second gate insulation layer GI2 away from the substrate 1, and the second connection electrode 8 is connected to the auxiliary electrode layer 6 through the conductive member 80 penetrating the buffer layer BUF, the first gate insulation layer GI1, the second gate insulation layer GI2 and the substrate 1. In other words, as long as the second connection electrode 8 does not affect the function of the light-emitting device 3, the embodiment of the present disclosure does not specifically limit the setting position of the second connection electrode 8.

[0063] In some embodiments, the first connection electrode 7 and the second connection electrode 8 are arranged in the same layer, that is, the first connection electrode 7 and the second connection electrode 8 are arranged at the same position. Referring to the arrangement method of the second connection electrode 8, the arrangement position of the first connection electrode 7 is not further explained here.

[0064] In some embodiments, the first connection electrode 7 and the second connection electrode 8 are made of the same material as the source and drain electrodes 22 of the thin film transistor 2. That is, the first connection electrode 7 and the second connection electrode 8 can be formed in the same manufacturing process as the source 21 and the drain 22 of the thin film transistor 2. Among them, the source 21 and the drain 22 of the thin film transistor 2 can be made of metal, alloy, metal nitride, conductive metal oxide, transparent conductive material and the like, for example, a single layer or multiple layers of metal, for example, Mo / Al / Mo or Ti / Al / Ti.

[0065] In some embodiments, Figure 4 As shown, the display substrate further includes a back film 9 , which is disposed on a side of the auxiliary electrode layer 6 away from the substrate 1 , and the back film 9 can protect the auxiliary electrode layer 6 .

[0066] It should be noted that Figure 4 In the display substrate shown in FIG. 1 , the substrate 1 may be a flexible substrate, for example, it may include a polyimide film (PI).

[0067] Figure 5 A schematic diagram of the structure of another display substrate provided in an embodiment of the present disclosure is shown in FIG. Figure 5As shown, the display substrate further includes an insulating layer 10, which is located on the side of the auxiliary electrode layer 6 away from the substrate 1, and the insulating layer is located on the side of the back film 9 close to the auxiliary electrode layer 6, that is, an insulating layer is provided between the auxiliary electrode layer 6 and the back film 9, which can improve the protection effect of the auxiliary electrode layer 6. Among them, the insulating layer 10 can be a PI film.

[0068] in addition, Figure 5 The display substrate shown is Figure 4 The other film layer structures of the display substrate shown are the same and will not be described in detail here.

[0069] The embodiment of the present disclosure also provides a display device, the display device includes the above-mentioned display substrate and a driving circuit; the display substrate also includes a touch electrode layer, and the touch electrode layer is located on a side of the plurality of light-emitting devices away from the substrate. In some embodiments, the driving circuit can perform a display driving process and a touch driving process in a time-sharing manner. Figure 6 A timing diagram of a scan signal and a touch signal of a display substrate provided in an embodiment of the present disclosure, such as Figure 6 As shown, the display substrate includes multiple display cycles T, each display cycle T includes a display stage t1 and a touch stage t2, that is, a row-by-row scan signal G1...Gn is provided in the display stage t1, and a touch signal touch is provided in the touch stage t2, so as to realize time-sharing driving of the display stage and the touch stage in the display substrate and reduce interference with the touch signal.

[0070] However, when the display driving process and the touch driving process are performed in time division, the timeliness of touch / writing will be poor. Therefore, in the embodiment of the present disclosure, the touch driving process is performed while the display driving process is performed.

[0071] The display substrate includes a plurality of pixels, each of which is provided with the light-emitting device; the driving circuit is configured to pass a touch signal to the touch electrode for touch detection; and is further configured to provide a display signal to the pixel line by line according to the image information of the target image. The display signal includes a scanning signal and a data signal; specifically, the driving circuit provides a scanning signal to the pixel line by line, and each time a row of pixels is scanned, a data signal is provided to each pixel in the row through a data line. The size of the data signal is determined according to the image information of the target image.

[0072] In addition, the driving circuit is also connected to the first signal terminal and the second signal terminal, and is configured to provide a second voltage signal to the second signal terminal through a first voltage signal of a constant voltage to the first signal terminal.

[0073] The second voltage signal may be a constant voltage signal. At this time, since capacitance is formed between the auxiliary electrode layer and the data line, and between the auxiliary voltage and the second electrode layer, the load of the data line increases, which will reduce the influence of the signal change on the data line on the signal on the second electrode layer and the touch electrode.

[0074] In addition, the auxiliary electrode layer can also play a role in signal shielding, preventing factors such as static electricity generated by the structure below the auxiliary electrode layer from having adverse effects on the touch electrodes.

[0075] In some examples, the second voltage signal may be a ground signal.

[0076] In some embodiments, the target image may be a stripe image and a non-stripe image. The stripe image includes a plurality of first sub-images and a plurality of second sub-images, the first sub-images and the second sub-images both correspond to a plurality of rows of pixels, the first sub-images and the second sub-images are arranged alternately, and the grayscale of the first sub-image is greater than the grayscale of the second sub-image. It should be noted that, among all the pixels corresponding to the same first sub-image, most of the pixels have the same grayscale to be displayed, for example, more than 80%, or more than 90% of the pixels have the same grayscale to be displayed, and this grayscale is used as the grayscale of the first sub-image. Similarly, among all the pixels corresponding to the same second sub-image, most of the pixels have the same grayscale to be displayed, for example, more than 80%, or more than 90% of the pixels have the same grayscale to be displayed, and this grayscale is used as the grayscale of the second sub-image.

[0077] Figure 7 The timing diagram of the data signal, the first voltage signal and the second voltage signal of a display substrate provided by the embodiment of the present disclosure. When the display substrate is driven to display a stripe image, the data signals on most of the data lines are as follows: Figure 7 As shown in Data, since the grayscale of the first sub-image is greater than the grayscale of the second sub-image, when providing a scan signal to the pixel corresponding to the first sub-image, the data signal is a high-level signal; when providing a scan signal to the pixel corresponding to the second sub-image, the data signal is a low-level signal; when the data signal jumps from a low level to a high level, it will have a positive effect on the first voltage signal on the second electrode layer, causing positive noise; when the data signal jumps from a high level to a low level, it will have a negative effect on the first voltage signal on the second electrode layer, causing negative noise. In order to reduce noise, the second voltage signal VSS2 can meet the following conditions; when the drive circuit provides a display signal to the pixel corresponding to the first sub-image (i.e. Figure 7 The second voltage signal VSS2 is at the first level; when the driving circuit provides a display signal to the pixel corresponding to the second sub-image (i.e. Figure 7In the stage where the data signal is at a low level, the second voltage signal VSS2 is at a second level; the first level is less than the second level. In this case, when the data signal jumps from a high level to a low level, the second voltage signal VSS2 jumps from a low level to a high level, and when the data signal jumps from a low level to a high level, the second level signal VSS2 jumps from a high level to a low level. The effects of the two on the first voltage signal can be offset, thereby reducing the noise on the touch signal.

[0078] In one example, the difference D between the first level and the second level is determined by a pre-test method, and can be obtained specifically according to the noise amplitude generated on the touch electrode. In one example, the above D is between 0.8-1.2V, for example, 1V. The first level can be the same as the level of the first voltage signal.

[0079] When the target image is a non-stripe image, the effect of the data signal on the touch electrode is not particularly obvious. Among them, the non-stripe image means that the grayscale of the pixels in each row or most rows is not exactly the same, or only a small number of pixels have the same grayscale. For example, in each row, at most 50% or 60% of the pixels have the same grayscale. In this case, the effect of the data signals on different data lines on the touch signal can be offset to a part, so that the overall effect of multiple data lines on the touch signal is smaller. At this time, the second voltage signal provided to the second signal terminal can be a fixed potential signal. Since capacitance is formed between the auxiliary electrode layer and the data line, and between the auxiliary voltage and the second electrode layer, the load on the data line is increased, which will weaken the effect of the signal fluctuation on the data line on the second electrode layer and the signal on the touch electrode.

[0080] In an example, when the second voltage signal is a fixed potential signal, the second voltage signal may specifically be a ground signal.

[0081] It should be noted that the above-mentioned display device can be: electronic paper, mobile phone, tablet computer, television, monitor, notebook computer, digital photo frame, navigator and any other product or component with display function, which is not limited in the present disclosure.

[0082] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display substrate, characterized in that: The display substrate comprises a display area and a binding area located on one side of the display area, and the display substrate comprises: substrate; an auxiliary electrode layer, wherein the auxiliary electrode layer is disposed on the substrate; A plurality of light-emitting devices are arranged on the substrate and located in the display area, the light-emitting devices include a first electrode, a light-emitting layer, and a second electrode arranged in sequence in a direction away from the substrate, the second electrodes of the plurality of light-emitting devices are connected to form a second electrode layer, and the orthographic projection of the auxiliary electrode layer on the substrate at least partially overlaps with the orthographic projection of the second electrode layer on the substrate; A first connecting electrode is located in the binding area, and the first connecting electrode is used to connect to the first signal terminal; the first connecting electrode is electrically connected to the second electrode layer; A second connecting electrode is located in the binding area, the second connecting electrode is used to connect to the second signal terminal, and the second connecting electrode is connected to the auxiliary electrode layer; The display substrate further includes a packaging layer and a touch electrode layer; The encapsulation layer is located on a side of the plurality of light-emitting devices away from the substrate; The touch electrode layer is located on a side of the encapsulation layer away from the light-emitting device, and the orthographic projection of the touch electrode layer on the substrate partially overlaps with the orthographic projection of the second electrode layer on the substrate; An electrical signal is provided to the second signal terminal, and the magnitude or timing of the electrical signal on the auxiliary electrode layer is adjusted so that the interference of the data signal on the touch signal and the interference of the signal on the auxiliary electrode layer on the touch signal are offset.

2. The display substrate according to claim 1, characterized in that: The orthographic projection of the auxiliary electrode layer on the substrate is consistent with the orthographic projection of the touch electrode layer on the substrate.

3. The display substrate according to claim 1 or 2, characterized in that: The auxiliary electrode layer is arranged on a side of the substrate away from the plurality of light emitting devices, and the second connecting electrode is connected to the auxiliary electrode layer via a conductive member penetrating the substrate.

4. The display substrate according to claim 3, characterized in that: The substrate is provided with a via hole, and the conductive member includes a conductive glue located in the via hole.

5. The display substrate according to claim 3, characterized in that: The display substrate further comprises an insulating layer, and the insulating layer is located on a side of the auxiliary electrode layer away from the substrate.

6. The display substrate according to claim 1 or 2, characterized in that: The first connecting electrode and the second connecting electrode are arranged in the same layer.

7. The display substrate according to claim 6, characterized in that: The display substrate further includes a thin film transistor, The thin film transistor is located between the light emitting device and the substrate, the first electrode of the light emitting device is connected to the drain of the thin film transistor, and the first connecting electrode and the second connecting electrode are made of the same material as the source and drain of the thin film transistor.

8. A display device, characterized in that: The display device comprises a display substrate and a driving circuit as described in any one of claims 1 to 7; the driving circuit is electrically connected to the first signal terminal and the second signal terminal, and is configured to: provide a constant first voltage signal to the first signal terminal; and provide a second voltage signal to the second signal terminal.

9. The display device according to claim 8, characterized in that: The display substrate comprises a plurality of pixels, each of which is provided with the light emitting device; the driving circuit is further configured to: provide display signals to the pixels line by line according to image information of a target image; The target image includes a stripe image, the stripe image includes a plurality of first sub-images and a plurality of second sub-images, the first sub-images and the second sub-images each correspond to at least one row of pixels, the first sub-images and the second sub-images are arranged alternately, and the grayscale of the first sub-image is greater than the grayscale of the second sub-image; when the driving circuit provides a display signal to a pixel corresponding to the first sub-image, the second voltage signal is at a first level; when the driving circuit provides a display signal to a pixel corresponding to the second sub-image, the second voltage signal is at a second level, and the first level is less than the second level; The difference between the first level and the second level is between 0.8V and 1.2V; Alternatively, the target image includes a non-stripe image, and the second voltage signal is a signal of a fixed potential.

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