Display module and touch display device

Abstract

The invention provides a display module and a touch display device, and relates to the technical field of display. At least one driving chip is arranged in a binding area; the mainboard comprises a power supply chip; wherein for the same driving chip, the resistance value between the first output end of the driving chip and the power supply chip is approximately equal to the resistance value between the second output end of the driving chip and the power supply chip; the distance between the first output end and the first side edge is the smallest, and the distance between the second output end and the second side edge is the smallest. The display module is used for preparing the touch display device.

Description

Display module, touch display device Technical Field

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

[0002] With the continuous development of the display industry and the upgrading of display technology, consumers are placing greater emphasis on the image quality of display products. Therefore, high-definition display products with high resolution, high transmittance, high contrast, and wide color gamut are becoming the favorites of more and more consumers.

[0003] Summary of the Invention

[0004] The embodiments of this application adopt the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides a display module, comprising a display area and a binding area located on one side of the display area; a plurality of touch signal lines and a plurality of common electrode units are disposed in the display area, the common electrode units being electrically connected to the touch signal lines; at least one driver chip is disposed in the binding area; the display module further comprises a mainboard, the mainboard including a power chip;

[0006] The driver chip includes a plurality of output terminals and at least one input terminal; the output terminals are electrically connected to the touch signal lines, and the input terminals are electrically connected to the power chip;

[0007] The driving chip includes a first side and a second side that are opposite to each other, and the first side and the second side both extend in a direction from the display area to the binding area;

[0008] Among them, for the same driver chip, the resistance value between the first output end of the driver chip and the power chip is approximately equal to the resistance value between the second output end of the driver chip and the power chip; the first output end is the output end with the smallest distance to the first side, and the second output end is the output end with the smallest distance to the second side.

[0009] In at least one embodiment of the present application, the driver chip includes a first signal line, which is in contact with all the output ends and electrically connected to the input end; the resistance between the first output end and the midpoint of the first signal line is approximately equal to the resistance between the second output end and the midpoint of the first signal line.

[0010] In at least one embodiment of the present application, the first signal line and the input end are indirectly electrically connected.

[0011] In at least one embodiment of the present application, the driver chip further includes a second signal line and a third signal line, wherein an extension trend of the second signal line is consistent with an extension trend of the first signal line, and an extension trend of the third signal line intersects with an extension trend of the second signal line; one end of the third signal line is in contact with and connected to a midpoint of the first signal line, and the other end of the third signal line is electrically connected to the second signal line;

[0012] The input end of the driving chip is arranged on one of the first side and the second side, and the input end is in contact with one end of the second signal line.

[0013] In at least one embodiment of the present application, the first signal line is directly connected to the input terminal.

[0014] In at least one embodiment of the present application, the driver chip includes two input terminals, which are respectively arranged on the first side and the second side, and the two input terminals are respectively in contact with two ends of the first signal line.

[0015] In at least one embodiment of the present application, the display module further includes at least one flexible circuit board and at least one power signal transmission line group; the power chip, the flexible circuit board, and the input end of the driver chip are electrically connected in sequence; the number of the driver chip, the flexible circuit board, and the power signal transmission line group is the same;

[0016] The power signal transmission line group includes at least one power signal transmission line, the power signal transmission line passes through the flexible circuit board from the mainboard and extends to the binding area, and the power signal transmission line is electrically connected to the input end of the driver chip;

[0017] The number of the power signal transmission lines in the power signal transmission line group passing through the same flexible circuit board is the same as the number of the input terminals on the same driving chip electrically connected to the flexible circuit board.

[0018] In at least one embodiment of the present application, a first binding portion and a plurality of first connecting lines are provided in the binding area, the first binding portion is located on a side of the driver chip away from the display area, and the first binding portion is electrically connected to the flexible circuit board and the first connecting lines respectively;

[0019] In the case where the driving chip includes two input terminals, the first connecting line includes a first part and a second part, the first connecting line in the first part is electrically connected to one input terminal and the first binding part respectively, and the first connecting line in the second part is electrically connected to the other input terminal and the first binding part respectively.

[0020] In at least one embodiment of the present application, the driver chip includes a first storage unit, a second storage unit, a conversion unit, and a touch unit, wherein the first storage unit, the second storage unit, and the touch unit are electrically connected to the conversion unit, respectively; a plurality of data signal lines and a plurality of pixel driving circuits arranged in an array are further provided in the display area, wherein one of the data signal lines is electrically connected to the same row of pixel driving circuits; and the conversion unit is electrically connected to the data signal line and the touch signal line, respectively;

[0021] The first storage unit is configured to store a display data signal, the second storage unit is configured to store a common voltage signal, and the touch control unit is configured to store a touch control signal;

[0022] In the display stage, the conversion unit is configured to control the conduction between the first storage unit and the data signal line, and is also configured to control the conduction between the second storage unit and the touch signal line;

[0023] In the touch control stage, the conversion unit is configured to control the touch control unit to be electrically connected to the data signal line and the touch signal line respectively.

[0024] In at least one embodiment of the present application, the display module includes at least two driver chips and at least two power signal transmission line groups, the power signal transmission line groups include at least one power signal transmission line, the power signal transmission line passes through the flexible circuit board from the mainboard and extends to the binding area, and the power signal transmission line is electrically connected to the input end of the driver chip;

[0025] Among them, each of the power signal transmission lines includes a first line segment, the first line segment is set on the mainboard, and the first line segment connects the flexible circuit board and the power chip; the mainboard also includes a resistance adjustment module, and at least part of the first line segment is also provided with a resistance adjustment module.

[0026] In at least one embodiment of the present application, the resistance adjustment module is provided on each of the first line segments, and the resistance adjustment module includes an adjustable resistor.

[0027] In at least one embodiment of the present application, each of the driver chips includes an input terminal, the display module includes a first driver chip and a second driver chip, and the input terminals of the first driver chip and the second driver chip are both located on the first side or both located on the second side;

[0028] The first driver chip is configured to control a first area in the display area, and the second driver chip is configured to control a second area in the display area, and an initial brightness of the first area is greater than an initial brightness of the second area;

[0029] Wherein, the resistance adjustment module is provided on the first line segment electrically connected to the first driving chip.

[0030] In at least one embodiment of the present application, the resistance value of the resistance adjustment module is substantially equal to the internal resistance value of the second driving chip.

[0031] In at least one embodiment of the present application, an orthographic projection of at least part of the data signal line on the substrate of the display module overlaps with an orthographic projection of the common electrode unit on the substrate;

[0032] In the touch stage, the data signal line and the touch signal line are both configured to transmit a scanning square wave signal, and the polarities of the scanning square wave signals transmitted by the data signal line and the touch signal line are consistent.

[0033] In a second aspect, an embodiment of the present application provides a touch display device, which includes the display module as described above.

[0034] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 is a schematic structural diagram of a non-touch display module provided in an embodiment of the present application;

[0037] FIG2 is a schematic structural diagram of a touch display module provided in an embodiment of the present application;

[0038] 3 and 4 are schematic diagrams showing uneven brightness of display images displayed by two touch display modules provided in embodiments of the present application;

[0039] FIG5 is a simplified schematic diagram of the structure of a driver chip in a related art provided by an embodiment of the present application;

[0040] 6 and 7 are simplified schematic diagrams of the structures of two driver chips provided in embodiments of the present application;

[0041] FIG8 is a schematic structural diagram of another touch display module provided in an embodiment of the present application;

[0042] FIG9 is a structural diagram of another touch display module provided in an embodiment of the present application.

[0043] FIG10 is a schematic diagram showing how the impedance of each output terminal of a driver chip varies with the distance between the output terminal and the input terminal according to an embodiment of the present application;

[0044] FIG11 is a schematic diagram of a partial structure of an array substrate provided in an embodiment of the present application;

[0045] FIG12 is a simplified structural diagram of a mainboard provided in an embodiment of the present application;

[0046] FIG13 and FIG14 are diagrams illustrating the working principles of the driver chip provided in the display stage and the touch stage according to the embodiment of the present application. Specific embodiments

[0047] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] In the embodiments of the present application, words such as "first", "second", "third", and "fourth" are used to distinguish between identical or similar items with basically the same functions and effects. This is only for the purpose of clearly describing the technical solutions of the embodiments of the present application, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0049] In the embodiments of the present application, the terms "upper" and "lower" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] Throughout the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of the present application. Schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be included in any one or more embodiments or examples in any suitable manner.

[0051] In the embodiments of the present application, “a plurality of” means two or more, and “at least one” means one or more, unless otherwise clearly defined.

[0052] The features "parallel," "perpendicular," and "identical" used in the embodiments of the present application include features such as "parallel," "perpendicular," and "identical" in the strict sense, as well as "approximately parallel," "approximately perpendicular," and "approximately identical" that include certain tolerances, taking into account the measurement and tolerances associated with the measurement of a particular quantity (e.g., limitations of the measurement system), and represent within an acceptable range of deviation for a particular value determined by a person of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within 10% or 5% of the stated value.

[0053] Unless the context requires otherwise, throughout the specification and claims, the term "comprising" is to be construed in an open, inclusive sense, ie, meaning "including, but not limited to."

[0054] In the embodiments of this application, "same layer" refers to the relationship between multiple film layers formed from the same material after the same step (e.g., a one-step patterning process). "Same layer" here does not always mean that the thickness of multiple film layers is the same or the height of multiple film layers in the cross-sectional view is the same. Polygons in this specification are not strictly defined and can be approximate triangles, parallelograms, trapezoids, pentagons, or hexagons, etc., and may have some minor deformations due to rounded corners or tolerances.

[0055] In the embodiments of the present application, the term “electrically connected” may refer to a direct electrical connection between two components, or may refer to an electrical connection between two components via one or more other components.

[0056] In this specification, "electrically connected" includes components connected together via an element having some electrical function. There are no particular limitations on the "element having some electrical function" as long as it enables the transfer of electrical signals between the connected components. Examples of "element having some electrical function" include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, and other components with various functions.

[0057] As shown in Figure 1 , a non-touch display product includes a full-surface common electrode 4. Common electrode lines (Com lines) extend from the flexible printed circuit board 2 and bypass the driver chip 3. These lines are routed around the common electrode 4 and electrically connected to the common electrode 4 at multiple locations in the peripheral area. This prevents the problem of a large IR drop across different areas of the common electrode 4 caused by a single point connection.

[0058] As shown in FIG2 , for a touch display product, compared to the non-touch display product shown in FIG1 , in order to realize the touch function, a plurality of common electrode blocks 4 are provided. In the display stage, the common electrode block 4 (also called the sensor electrode) transmits a common voltage signal, and in the touch stage, the common electrode block 4 transmits a touch signal, that is, the display and touch functions are simultaneously realized by time-division multiplexing the common electrode block 4. Since a touch signal needs to be provided to the common electrode block 4 in the touch stage, the common electrode line (Com line) needs to pass through the driver chip 3 after being led out from the flexible circuit board 2, and then provide a signal to the display area AA through the output terminal in the driver chip 3. In this way, the driver chip 3 can transmit the touch signal to the touch signal line TX through the common electrode line (Com line) in the touch stage, wherein the common electrode block 4 is electrically connected to the common electrode line (Com line) through the touch signal line TX.

[0059] However, in actual applications, the common electrode block 4 will inevitably overlap with the position of the data signal line (Data line, also called Source line, not drawn in Figure 2). In this way, there is a parasitic capacitance between the data signal line and the common electrode block 4. When the polarity of the signal transmitted in the data signal line is reversed, the signal in the common electrode block 4 will be pulled in the same direction, causing the signal transmitted in the common electrode block 4 to be unstable. When the picture is displayed, it will cause the picture brightness to decrease and the display to become darker. This phenomenon will be particularly significant for high-resolution, high-refresh-rate display products. In addition, when the resistance of the common electrode line (Com line) that transmits the common voltage signal itself is large, the longer it takes for the signal in the common electrode block 4 to recover after being pulled, the more significant the phenomenon of reduced brightness of the display picture in the local area.

[0060] Based on this, an embodiment of the present application provides a display module, as shown in FIG2 , comprising a display area AA and a binding area BD located on one side of the display area; a plurality of touch signal lines TX and a plurality of common electrode units 4 are provided in the display area AA, and the common electrode units 4 are electrically connected to the touch signal lines TX; at least one driver chip 3 is provided in the binding area BD; the display module further comprises a mainboard 1, which includes a power chip 11;

[0061] As shown in Figure 6 or Figure 7, the driver chip 3 includes multiple output terminals 32 and at least one input terminal 31; the output terminal 32 is electrically connected to the touch signal line TX, and the input terminal 31 is electrically connected to the power chip 11; the driver chip 3 includes a first side B1 and a second side B2 arranged opposite to each other, and the first side B1 and the second side B2 both extend in the direction from the display area AA to the binding area BD; wherein, for the same driver chip 3, the resistance value between the first output terminal of the driver chip 3 and the power chip 11 is approximately equal to the resistance value between the second output terminal of the driver chip 3 and the power chip 11; the first output terminal is the output terminal 32 with the smallest distance to the first side B1, and the second output terminal is the output terminal 32 with the smallest distance to the second side B2.

[0062] It should be noted that in the embodiments of the present application, the touch signal lines TX are all arranged in the display area AA; in some other embodiments, the touch signal lines TX can be arranged in the peripheral area; in order to reduce the size of the peripheral area and improve the aesthetics of the display product, the embodiments of the present application are described as follows: the touch signal lines TX are all arranged in the display area AA.

[0063] In an exemplary embodiment, the common electrode unit 4 is made of a light-transmitting conductive material, such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0064] The shape and size of the common electrode unit 4 are not limited here.

[0065] Exemplarily, the planar shape of the common electrode unit 4 can be a polygon, an arc, or a combination of a polygon and an arc. For example, the polygon can include a quadrilateral, a pentagon, a hexagon, etc.; for example, the arc can include a fan-shaped, a circle, an ellipse, a semicircle, a semi-ellipse, etc.; wherein, the combination of polygons and arcs includes a figure formed by removing a local area on a polygon or an arc, and an image formed by splicing local areas on a polygon or an arc, and the figure of the removed or spliced ​​local area can include a polygon or an arc.

[0066] Exemplarily, the common electrode unit 4 may cover a plurality of pixel units, for example, the common electrode unit 4 may cover four pixel units, or the common electrode unit 4 may cover six pixel units, or the common electrode unit 4 may cover nine pixel units. That is, the planar size of the common electrode unit 4 may be greater than or equal to the planar size of four pixel units; or the planar size of the common electrode unit 4 may be greater than or equal to the planar size of six pixel units; or the planar size of the common electrode unit 4 may be greater than or equal to the planar size of nine pixel units.

[0067] The driver chip 3 may be configured to provide a display driver signal and a touch driver signal. For example, the driver chip 3 may be a TDDI (Touch and Display Driver Integration) driver chip, or an SR (Source / Read-out IC) driver chip.

[0068] For example, display products using TDDI technology can be divided into ADS (Advanced Super Dimension Switch) type liquid crystal touch screens or HADS type liquid crystal touch screens.

[0069] In an exemplary embodiment, the mainboard 1 may include a printed circuit board assembly (PCBA), wherein the mainboard 1 includes at least a power chip 11, a timing controller (TCON), and a microcontroller unit (MCU).

[0070] The power chip 11 may be a power management integrated circuit (PMIC).

[0071] The input end refers to a port in the driver chip 3 for transmitting input signals from the mainboard 1 to the driver chip 3 , and the output end refers to a port in the driver chip 3 for transmitting signals to the display area AA of the display module.

[0072] The display module includes an array substrate 100 , the driving chip 3 is bound in a binding area BD of the array substrate 100 , and an output end of the driving chip 3 is used to transmit signals to the array substrate 100 .

[0073] It should be noted that the driver chip 3 includes at least one input terminal for transmitting a common voltage signal. The input terminals involved in the embodiments of the present application all refer to input terminals for transmitting a common voltage signal. In actual applications, the driver chip 3 may include multiple other similar input terminals for transmitting signals other than the common voltage signal.

[0074] In the statement that the resistance value between the first output terminal and the power chip is substantially equal to the resistance value between the second output terminal and the power chip, "substantially equal" includes a certain tolerance, which, taking into account measurement and tolerances associated with the measurement of a particular quantity (e.g., limitations of the measurement system), means within an acceptable range of deviation for a particular value determined by one of ordinary skill in the art. For example, "substantially equal" can mean within one or more standard deviations, or within 3% or 5% of the stated value.

[0075] The following situations fall within the scope of "approximately equal to":

[0076] Exemplarily, the difference between the resistance value between the first output terminal and the power supply chip and the resistance value between the second output terminal and the power supply chip is less than or equal to 1%, 2%, or 3% of the resistance value between the first output terminal and the power supply chip; exemplary, the difference between the resistance value between the first output terminal and the power supply chip and the resistance value between the second output terminal and the power supply chip is less than or equal to 1%, 2%, or 3% of the resistance value between the second output terminal and the power supply chip.

[0077] In the related art, as shown in FIG3 , since the common electrode line (Com line) is input from a single side of the driver chip 3, for the same driver chip 3, such as the driver chip 3 on the left in FIG3 , the common voltage signal (Vcom signal) transmitted by the common electrode line (Com line) is input from the right side of the driver chip 3. Due to the internal resistance within the driver chip 3, for each output terminal outputting a signal from the driver chip 3, the farther the output terminal is from the right side of the driver chip 3, the greater the internal resistance, and the greater the voltage drop of the touch signal line TX electrically connected to the corresponding output terminal. When the display product is heavily loaded, the common electrode block 4 recovers slowly after being pulled by the data signal line. Consequently, due to the combined effects of multiple factors, the display area AA of the display product exhibits the following: the touch signal line TX electrically connected to the output terminal closer to the common voltage signal input terminal of the driver chip 3 has higher brightness in the local area where the touch signal line TX is located, and the touch signal line TX electrically connected to the output terminal farther from the common voltage signal input terminal of the driver chip 3 has lower brightness in the local area where the touch signal line TX is located. This results in uneven brightness across different areas of the display area AA, such as a split screen phenomenon. It should be noted that, as shown in FIG10 , the farther the output terminal is from the common voltage signal input terminal of the driver chip 3 , the greater the resistance R; the closer the output terminal is to the common voltage signal input terminal of the driver chip 3 , the smaller the resistance R.

[0078] In the display module provided in the embodiment of the present application, the resistance value between the first output end and the power chip 11 is set to be approximately equal to the resistance value between the second output end and the power chip 11; wherein, the first output end is the output end 32 with the smallest distance to the first side B1, and the second output end is the output end 32 with the smallest distance to the second side B2; in this way, the internal resistance of the wiring or conductive structure for transmitting the common voltage signal can be significantly reduced, so that the resistance values ​​between different output ends 32 and the power chip 11 tend to be consistent, and the difference in resistance values ​​between different output ends 32 and the power chip 11 is reduced, thereby improving the problem of uneven brightness of the display screen of the display module.

[0079] In at least one embodiment of the present application, as shown in Figures 6 and 7, the driver chip 3 includes a first signal line 33, which is in contact with all the output terminals 32 and electrically connected to the input terminal 31; the resistance R1 between the first output terminal and the midpoint of the first signal line 33 is approximately equal to the resistance R2 between the second output terminal and the midpoint of the first signal line 33.

[0080] In an exemplary embodiment, the resistance between the first output terminal and the input terminal 31 is substantially equal to the resistance between the second output terminal and the input terminal 31 .

[0081] In an exemplary embodiment, the extension direction of the first signal line 33 intersects with the extension direction of each output terminal 32;

[0082] In an exemplary embodiment, the electrical connection between the first signal line 33 and the input terminal 31 includes: as shown in FIG. 7 , the first signal line 33 and the input terminal 31 are in contact electrical connection; or, as shown in FIG. 6 , the first signal line 33 and the input terminal 31 are in indirect electrical connection.

[0083] Among them, the resistance R1 between the first output terminal and the midpoint of the first signal line 33 is approximately equal to the resistance R2 between the second output terminal and the midpoint of the first signal line 33. The "approximately equal to" in the approximately equal to includes "approximately equal to" and "equal to", wherein "approximately equal to" includes but is not limited to the following situations: the difference between the resistance R1 between the first output terminal and the midpoint of the first signal line 33 and the resistance R2 between the second output terminal and the midpoint of the first signal line 33 is less than or equal to the preset value. For example, the preset value can be 1%, 2%, 3%, 4%, or 5% of the resistance R1 (or resistance R2).

[0084] In at least one embodiment of the present application, as shown in FIG6 , the first signal line 33 and the input terminal 31 are indirectly electrically connected.

[0085] In at least one embodiment of the present application, as shown in FIG6 , the driver chip 3 further includes a second signal line 34 and a third signal line 35 . The extension trend of the second signal line 34 is consistent with the extension trend of the first signal line 33 , and the extension trend of the third signal line 35 intersects with the extension trend of the second signal line 34 . One end of the third signal line 35 is in contact with and connected to the midpoint of the first signal line 33 , and the other end of the third signal line 35 is electrically connected to the second signal line 34 .

[0086] The input terminal 31 of the driving chip 3 is disposed on one of the first side B1 and the second side B2 , and the input terminal 31 is in contact with one end of the second signal line 34 .

[0087] It should be noted that the first signal line 33, the second signal line 34 and the third signal line 35 in the driver chip 3 provided in the embodiment of the present application do not necessarily mean that the signal lines must be straight lines, and they may also have certain bends or curves, as long as the signal lines as a whole have a tendency to extend in one direction.

[0088] In addition, the extension trend of the second signal line 34 is consistent with the extension trend of the first signal line 33 , which does not mean that the two signal lines are parallel.

[0089] In the embodiment of the present application, as shown in FIG6 , by setting the driver chip 3 to include a second signal line 34 and a third signal line 35, the extension trend of the second signal line 34 is consistent with the extension trend of the first signal line 33, and the extension trend of the third signal line 35 intersects with the extension trend of the second signal line 34; one end of the third signal line 35 is in contact with the midpoint of the first signal line 33, and the other end of the third signal line 35 is electrically connected to the second signal line 34. In this way, when only one input terminal 31 is set (i.e., the position design of the original input terminal of the driver chip 3 is not changed), the first output terminal and the first output terminal can be connected. The resistance R1 between the midpoints of the signal lines 33 is approximately equal to the resistance R2 between the second output end and the midpoint of the first signal line 33, so that the resistance values ​​R1 and R2 between the output ends 32 on both sides of the same driver chip 3 (the output end 32 close to the first side B1 and the output end 32 set close to the second side B2) and the input end 31 of the driver chip 3 tend to be the same or the same, so that the resistance values ​​between different output ends 32 and the power chip 11 tend to be consistent, reducing the difference in resistance values ​​between different output ends 32 and the power chip 11, thereby improving the problem of uneven brightness of the display screen of the display module.

[0090] In at least one embodiment of the present application, as shown in FIG. 7 , the first signal line 33 and the input terminal 31 are directly connected.

[0091] In at least one embodiment of the present application, as shown in FIG7 , the driver chip 3 includes two input terminals 31 , which are respectively arranged on the first side B1 and the second side B2 , and are respectively in contact with both ends of the first signal line 33 .

[0092] In an embodiment of the present application, by changing the number of input terminals 31 of the common voltage signal in the driver chip 3, an input terminal 31 is respectively set on the first side B1 and the second side B2 of the driver chip 3, so that the resistance values ​​R1 and R2 between the output terminals 32 on both sides of the same driver chip 3 (the output terminal 32 close to the first side B1 and the output terminal 32 set close to the second side B2) and the input terminal 31 of the driver chip 3 tend to be the same or the same, thereby reducing the resistance value difference between the first output terminal and the second output terminal in the same driver chip 3, thereby improving the problem of uneven brightness of the display screen of the display module.

[0093] In at least one embodiment of the present application, as shown in FIG8 , the display module further includes at least one flexible circuit board 2 and at least one power signal transmission line group; the power chip 11, the flexible circuit board 2, and the input end 31 of the driver chip 3 are electrically connected in sequence; the number of the driver chip 3, the flexible circuit board 2, and the power signal transmission line group is the same;

[0094] The power signal transmission line group includes at least one power signal transmission line CSL, which extends from the mainboard 1 through the flexible circuit board 2 and to the binding area BD. The power signal transmission line CSL is electrically connected to the input terminal 31 of the driver chip 3;

[0095] As shown in FIG8 , the number of power signal transmission lines CSL in the power signal transmission line group passing through the same flexible circuit board 2 is the same as the number of input terminals 31 on the same driver chip 3 electrically connected to the flexible circuit board 2 .

[0096] For example, as shown in FIG8 , the number of power signal transmission lines CSL passing through the same flexible circuit board 2 in the power signal transmission line group is two, and the number of input terminals 31 of the driving chip 3 electrically connected to the flexible circuit board 2 is two.

[0097] In an embodiment of the present application, by designing the number of power signal transmission lines CSL passing through the same flexible circuit board 2 in the power signal transmission line group to be the same as the number of input terminals 31 on the same driver chip 3 electrically connected to the flexible circuit board 2, the part of the power signal transmission line CSL located on the mainboard 1 and the part of the power signal transmission line CSL located on the flexible circuit board 2 are changed to match the input terminal 31 of the driver chip 3, thereby reducing the resistance value difference between the first output terminal and the second output terminal in the same driver chip 3, thereby improving the problem of uneven brightness of the display screen of the display module.

[0098] In at least one embodiment of the present application, as shown in conjunction with FIG8 and FIG11 , a first binding portion 101 and a plurality of first connection lines L1 are provided in the binding area BD. The first binding portion 101 is located on a side of the driver chip 3 away from the display area AA. The first binding portion 101 is electrically connected to the flexible circuit board 2 and the first connection lines L1, respectively.

[0099] When the driving chip 3 includes two input terminals 31, the first connecting line L1 includes a first part and a second part. The first part of the first connecting line L1 is electrically connected to one input terminal 31 and the first binding part 101 respectively, and the second part of the first connecting line L1 is electrically connected to the other input terminal 31 and the first binding part 101 respectively.

[0100] In an exemplary embodiment, the first portion of the first connection lines L1 and the second portion of the first connection lines L1 may be symmetrically disposed.

[0101] It should be noted that FIG11 schematically illustrates a case where the driver chip 3 includes one input terminal 31 .

[0102] Exemplarily, as shown in FIG12 , the mainboard 1 of the display module may further include at least one second binding portion 12 , which is bound to the flexible circuit board 2 . Of course, the mainboard 1 may further include a timing controller and a microprocessor (both are collectively marked as 13 ).

[0103] In at least one embodiment of the present application, as shown in FIG13 and FIG14 , the driver chip 3 includes a first storage unit 3A, a second storage unit 3B, a conversion unit 3D, and a touch unit 3C. The first storage unit 3A, the second storage unit 3B, and the touch unit 3C are electrically connected to the conversion unit 3D, respectively. A plurality of data signal lines DL (Data lines) and a plurality of pixel driving circuits arranged in an array are further provided in the display area AA. A data signal line is electrically connected to the same row of pixel driving circuits. The conversion unit 3D is electrically connected to the data signal line DL and the touch signal line TX, respectively.

[0104] The first storage unit 3A is configured to store a display data signal Data signal, the second storage unit 3B is configured to store a common voltage signal, and the touch unit 3C is configured to store a touch signal;

[0105] As shown in FIG13 , during the display period, the conversion unit 3D is configured to control the conduction between the first storage unit 3A and the data signal line DL, and also to control the conduction between the second storage unit 3B and the touch signal line TX. The display data signal stored in the first storage unit 3A is transmitted to the data signal line DL, and the common voltage signal stored in the second storage unit 3B is transmitted to the common electrode unit 4 (Vcom Sensor) via the touch signal line TX. The Sout-channel (data line channel) shown in FIG13 outputs the display data signal, and the TX-channel (touch line channel) outputs the common voltage signal.

[0106] As shown in Figure 14, in the touch stage, the conversion unit 3D is configured to control the touch unit 3C to be conductive with the data signal line DL and the touch signal line TX respectively; the Sout-channel (data line channel) and TX-channel (touch line channel) shown in Figure 14 both output scanning square wave signals (Modulation signals).

[0107] For example, if the display module has M rows and N columns of common electrode units 4 , M*N common electrode units 4 are scanned within one frame of touch control time.

[0108] In the embodiment of the present application, since the resistance R1 between the first output terminal and the midpoint of the first signal line 33 in the same driver chip 3 is set to be approximately equal to the resistance R2 between the second output terminal and the midpoint of the first signal line 33, in this way, in the display stage, even when the polarity of the signal transmitted in the data signal line DL is reversed, the common electrode unit 4 is affected by the signal transmitted in the data signal line DL and is pulled in the same direction, since the resistance difference between the common voltage signals output from the output terminal 32 of the driver chip 3 to the TX-channel (touch line channel) is very small, the probability of uneven brightness of the display screen is reduced, thereby improving the uniformity of the display screen, and improving the picture quality and display effect.

[0109] In the related art, when the common voltage signal input terminals of two adjacent driver chips 3 are both located on the same side of the driver chip 3, for example, as shown in FIG4 , the common voltage signal input terminals of the driver chip 3 on the left and the driver chip 3 in the middle are both located on the right; for the driver chip 3 on the left, the touch signal line TX electrically connected to the output terminal closest to the common voltage signal input terminal of the driver chip 3 has the brightest brightness in the local area where it is located; for the driver chip 3 in the middle, the touch signal line TX electrically connected to the output terminal farthest from the common voltage signal input terminal of the driver chip 3 has the darkest brightness in the local area where it is located; in this way, the brightest area of ​​the display screen controlled by the driver chip 3 on the left is adjacent to the darkest area of ​​the display screen controlled by the driver chip 3 in the middle, resulting in a significant contrast, presenting a phenomenon of uneven brightness between the areas controlled by the two adjacent driver chips 3 (also known as the split-screen phenomenon between different driver chips). FIG5 is a simplified structural schematic diagram of the driver chip 3 on the left and the driver chip 3 in the middle in FIG4 .

[0110] In at least one embodiment of the present application, as shown in FIG9 , the display module includes at least two driver chips 3 and at least two power signal transmission line groups. The power signal transmission line groups include at least one power signal transmission line (also referred to as a Com line). The power signal transmission line extends from the mainboard 1 through the flexible circuit board 2 and to the binding area BD. The power signal transmission line is electrically connected to the input terminal 31 of the driver chip 3.

[0111] Among them, each power signal transmission line includes a first line segment XD1, the first line segment XD1 is set on the mainboard 1, and the first line segment XD1 connects the flexible circuit board 2 and the power chip 11; the mainboard 1 also includes a resistance adjustment module 8, and a resistance adjustment module 8 is also set on at least part of the first line segment XD1.

[0112] In at least one embodiment of the present application, a resistance adjustment module 8 is provided on each first line segment XD1 , and the resistance adjustment module 8 includes an adjustable resistor.

[0113] In at least one embodiment of the present application, each driver chip 3 includes an input terminal 31. As shown in FIG9 , the display module includes a first driver chip (e.g., the driver chip on the left) and a second driver chip (e.g., the driver chip in the middle). The input terminals 31 of the first driver chip and the second driver chip are both located on the first side B1 or on the second side B2; that is, the display module includes two driver chips with input terminals 31 located on the same side.

[0114] As shown in Figure 9, the first driver chip is configured to control the first area A1 in the display area AA, and the second driver chip is configured to control the second area A2 in the display area AA. The initial brightness of the first area A1 is greater than the initial brightness of the second area A2; wherein, a resistance adjustment module 8 is provided on the first line segment XD1 electrically connected to the first driver chip.

[0115] The initial brightness of the first area A1 and the initial brightness of the second area A2 refer to the brightness when the display module is not provided with the resistance adjustment module 8; or refer to the brightness when the resistance adjustment module 8 is a zero ohm resistance.

[0116] In an exemplary embodiment, the resistance adjustment module 8 includes an adjustable resistor.

[0117] In at least one embodiment of the present application, the resistance value of the resistance adjustment module 8 is substantially equal to the internal resistance value of the second driver chip.

[0118] In the embodiment of the present application, before the resistance adjustment module 8 is provided, for the driver chip 3 on the left (i.e., the first driver chip), the output end 32 closest to the input end 31 of the first driver chip is electrically connected to the touch signal line TX, and the brightness of the display screen in the local area where the touch signal line TX is located is the brightest; for the middle driver chip 3 (i.e., the second driver chip), the output end 32 farthest from the input end 31 of the second driver chip 3 is electrically connected to the touch signal line TX, and the brightness of the display screen in the local area where the touch signal line TX is located is the darkest; the resistance difference between these two output ends 32 is approximately the internal resistance value of the second driver chip 3; in the embodiment of the present application, by setting the resistance value of the resistance adjustment module 8 to be approximately equal to the internal resistance value of the second driver chip, the resistance values ​​between the output end 32 closest to the input end 31 of the first driver chip and the output end 32 farthest from the input end 31 of the second driver chip 3 can be made consistent with the input end 31 of their respective driver chips 3, thereby reducing the resistance value difference between the output ends 32 of the two adjacent driver chips 3, thereby improving the problem of uneven display screen brightness of the display module.

[0119] In at least one embodiment of the present application, the orthographic projection of at least part of the line segment of the data signal line DL on the substrate of the display module overlaps with the orthographic projection of the common electrode unit 4 on the substrate;

[0120] In the touch stage, both the data signal line DL and the touch signal line TX are configured to transmit scanning square wave signals, and the polarities of the scanning square wave signals transmitted by the data signal line DL and the touch signal line TX are consistent.

[0121] The meaning of consistent polarity is that the scanning square wave signals transmitted by the data signal line DL and the touch signal line TX are both at a high level in the same time period, and are both at a low level in another same time period.

[0122] For example, the amplitudes of the scanning square wave signals transmitted by the data signal line DL and the touch signal line TX may be different.

[0123] In the display module provided in the embodiment of the present application, since the orthographic projection of at least part of the line segment of the data signal line DL on the substrate of the display module overlaps with the orthographic projection of the common electrode unit 4 on the substrate, a parasitic capacitance is formed between the data signal line DL and the common electrode unit 4. By setting the polarity of the scanning square wave signal transmitted by the data signal line DL and the touch signal line TX to be consistent, it is possible to avoid the signal in the data signal line DL from having a negative impact on the touch signal in the common electrode unit 4 when the polarity is reversed, thereby avoiding a reduction in signal stability, improving the signal transmission stability, and improving the touch performance of the display module.

[0124] An embodiment of the present application provides a touch display device, which includes the display module as described above.

[0125] For example, the specific structure of the display module included in the touch display device can be referred to the above description and will not be repeated here.

[0126] Exemplarily, the touch display device may be an ADS (Advanced Super Dimension Switch) type liquid crystal touch display device or a HADS type liquid crystal touch display device.

[0127] The touch display device may be a touch display panel, as well as any product or component with a display function, such as a television, a digital camera, a mobile phone, a tablet computer, etc., which includes the touch display panel.

[0128] In the touch display device provided in the embodiment of the present application, the resistance value between the first output end and the power chip 11 is set to be approximately equal to the resistance value between the second output end and the power chip 11; wherein, the first output end is the output end 32 with the smallest distance to the first side B1, and the second output end is the output end 32 with the smallest distance to the second side B2; in this way, the internal resistance of the wiring or conductive structure for transmitting the common voltage signal can be significantly reduced, so that the resistance values ​​between different output ends 32 and the power chip 11 tend to be consistent, and the difference in resistance values ​​between different output ends 32 and the power chip 11 is reduced, thereby improving the problem of uneven brightness of the display screen of the display module.

[0129] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A display module, wherein: The display module comprises a display area and a binding area located on one side of the display area; a plurality of touch signal lines and a plurality of common electrode units are arranged in the display area, and the common electrode units are electrically connected to the touch signal lines; at least one driving chip is arranged in the binding area; the display module further comprises a mainboard, and the mainboard comprises a power chip; The driving chip comprises a plurality of output terminals and at least one input terminal; the output terminals are electrically connected to the touch signal lines, and the input terminals are electrically connected to the power chip; The driving chip comprises a first side edge and a second side edge which are arranged opposite to each other, and the first side edge and the second side edge both extend in a direction from the display area to the binding area; Among them, for the same driver chip, the resistance value between the first output end of the driver chip and the power chip is approximately equal to the resistance value between the second output end of the driver chip and the power chip; the first output end is the output end with the smallest distance to the first side, and the second output end is the output end with the smallest distance to the second side.

2. The display module according to claim 1, wherein: The driving chip includes a first signal line, which is in contact with all the output ends and electrically connected to the input end; the resistance between the first output end and the midpoint of the first signal line is substantially equal to the resistance between the second output end and the midpoint of the first signal line.

3. The display module according to claim 2, wherein: The first signal line is indirectly electrically connected to the input terminal.

4. The display module according to claim 3, wherein: The driving chip further includes a second signal line and a third signal line, the extension trend of the second signal line is consistent with the extension trend of the first signal line, and the extension trend of the third signal line intersects with the extension trend of the second signal line; One end of the third signal line is in contact with and connected to the midpoint of the first signal line, and the other end of the third signal line is electrically connected to the second signal line; The input end of the driving chip is arranged on one of the first side and the second side, and the input end is in contact with one end of the second signal line.

5. The display module according to claim 2, wherein: The first signal line is directly connected to the input terminal.

6. The display module according to claim 5, wherein: The driving chip includes two input terminals, which are respectively arranged on the first side and the second side, and are respectively in contact with two ends of the first signal line.

7. The display module according to claim 4 or 6, wherein: The display module further includes at least one flexible circuit board and at least one power signal transmission line group; the power chip, the flexible circuit board and the input end of the driving chip are electrically connected in sequence; the number of the driving chip, the flexible circuit board and the power signal transmission line group is the same; The power signal transmission line group includes at least one power signal transmission line, the power signal transmission line passes through the flexible circuit board from the mainboard and extends to the binding area, and the power signal transmission line is electrically connected to the input end of the driving chip; The number of the power signal transmission lines in the power signal transmission line group passing through the same flexible circuit board is the same as the number of the input terminals on the same driving chip electrically connected to the flexible circuit board.

8. The display module according to claim 7, wherein: A first binding portion and a plurality of first connecting wires are provided in the binding area, the first binding portion is located at a side of the driving chip away from the display area, and the first binding portion is electrically connected to the flexible circuit board and the first connecting wires respectively; In the case where the driving chip includes two input terminals, the first connecting line includes a first part and a second part, the first connecting line in the first part is electrically connected to one of the input terminals and the first binding part respectively, and the first connecting line in the second part is electrically connected to the other input terminal and the first binding part respectively.

9. The display module according to claim 7, wherein: The driving chip includes a first storage unit, a second storage unit, a conversion unit and a touch unit, wherein the first storage unit, the second storage unit and the touch unit are electrically connected to the conversion unit respectively; a plurality of data signal lines and a plurality of pixel driving circuits arranged in an array are also provided in the display area, wherein one of the data signal lines is electrically connected to the pixel driving circuits in the same row; the conversion unit is electrically connected to the data signal line and the touch signal line respectively; The first storage unit is configured to store a display data signal, the second storage unit is configured to store a common voltage signal, and the touch control unit is configured to store a touch control signal; In the display stage, the conversion unit is configured to control the conduction between the first storage unit and the data signal line, and is also configured to control the conduction between the second storage unit and the touch signal line; In the touch control stage, the conversion unit is configured to control the touch control unit to be electrically connected to the data signal line and the touch signal line respectively.

10. The display module according to claim 1, wherein: The display module includes at least two driving chips and at least two power signal transmission line groups, the power signal transmission line group includes at least one power signal transmission line, the power signal transmission line passes through the flexible circuit board from the mainboard and extends to the binding area, and the power signal transmission line is electrically connected to the input end of the driving chip; Among them, each of the power signal transmission lines includes a first line segment, the first line segment is set on the mainboard, and the first line segment connects the flexible circuit board and the power chip; the mainboard also includes a resistance adjustment module, and at least part of the first line segment is also provided with a resistance adjustment module.

11. The display module according to claim 10, wherein: The resistance adjustment module is disposed on each of the first line segments, and the resistance adjustment module includes an adjustable resistor.

12. The display module according to claim 10, wherein: Each of the driving chips comprises an input terminal, the display module comprises a first driving chip and a second driving chip, and the input terminals of the first driving chip and the second driving chip are both located at the first side or at the second side; The first driving chip is configured to control a first area in the display area, and the second driving chip is configured to control a second area in the display area, and an initial brightness of the first area is greater than an initial brightness of the second area; Wherein, the resistance adjustment module is arranged on the first line segment electrically connected to the first driving chip.

13. The display module according to claim 12, wherein: The resistance value of the resistance adjustment module is substantially equal to the internal resistance value of the second driving chip.

14. The display module according to claim 9, wherein: The orthographic projection of at least part of the line segments of the data signal line on the substrate of the display module overlaps with the orthographic projection of the common electrode unit on the substrate; In the touch control stage, the data signal line and the touch signal line are both configured to transmit a scanning square wave signal, and the polarities of the scanning square wave signals transmitted by the data signal line and the touch signal line are consistent.

15. A touch display device, wherein: Comprising a display module as described in any one of claims 1-14.

Images