Backlight module and display device

Abstract

The present disclosure provides a backlight module and a display device. The backlight module includes: a plurality of lamp groups provided on a substrate, the plurality of lamp groups are arranged in an array on the substrate, each lamp group includes a plurality of sub-millimeter light-emitting diodes, a plurality of internal wires in the lamp group, an external anode and an external cathode; a plurality of anode wirings, respectively electrically connected to the external anodes of the plurality of rows of lamp groups; a plurality of cathode wirings, respectively electrically connected to the external cathodes of the plurality of rows of lamp groups. Among at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to the external cathodes of lamp groups located in different rows, so as to provide cathode signals to the lamp groups located in different rows in a time-sharing multiplexing manner. The same wiring lamp groups include a plurality of lamp groups electrically connected to the same cathode wiring, the same type of anode wiring includes a plurality of anode wirings connected to the same wiring lamp groups, and the orthographic projection of the same type of anode wiring on the substrate substrate does not overlap with the orthographic projection of the internal wires of the same lamp group on the substrate substrate.

Description

Technical Field

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

[0002] Light emitting diode (LED) technology has been developed for nearly three decades, and its application range has been continuously expanded. For example, it can be applied to the display field and used as a backlight source for display devices or as an LED display screen. With the development of technology, sub-millimeter light emitting diode (Mini Light Emitting Diode, Mini LED for short) has gradually become a research hotspot in the field of display technology. For example, Mini LED can be used in the backlight module of a liquid crystal display device as a light-emitting element of the backlight module. In this way, by utilizing the advantages of Mini LED, the backlight module can achieve the advantages of zone dimming, fast response, simple structure and long life.

[0003] The above information disclosed in this section is only for understanding the background of the inventive concept of the present disclosure and therefore the above information may contain information that does not constitute prior art. Summary of the Invention

[0004] In order to solve at least one aspect of the above problems, embodiments of the present disclosure provide a backlight module and a display device.

[0005] In one aspect, a backlight module is provided, comprising:

[0006] substrate;

[0007] a plurality of lamp groups disposed on the substrate, the plurality of lamp groups being arranged in an array on the substrate, each lamp group comprising a plurality of sub-millimeter light emitting diodes, a plurality of internal wires within the lamp group, an external anode, and an external cathode, the plurality of internal wires within the lamp group electrically connecting the plurality of sub-millimeter light emitting diodes in series;

[0008] a plurality of anode wirings, the plurality of anode wirings being electrically connected to external anodes of the plurality of rows of lamp groups;

[0009] A plurality of cathode wirings, each of which is electrically connected to the external cathodes of the plurality of rows of lamp groups.

[0010] wherein, among at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to external cathodes of lamp groups located in different rows, so as to provide cathode signals to the lamp groups located in different rows in a time-division multiplexing manner; and

[0011] The same-wiring lamp group includes multiple lamp groups electrically connected to the same cathode wiring, and the same-type anode wiring includes multiple anode wirings connected to the same-wiring lamp group, and the positive projection of the same-type anode wiring on the base substrate does not overlap with the positive projection of the wire in the same lamp group on the base substrate.

[0012] According to some exemplary embodiments, the multiple cathode wirings are arranged at intervals, the substrate includes multiple regions, and any two adjacent regions among the multiple regions are separated by the orthographic projection of at least one cathode wiring on the substrate; the orthographic projections of the same type of anode wiring on the substrate are respectively located in different regions among the multiple regions.

[0013] According to some exemplary embodiments, the multiple anode wires include multiple groups of anode wires, and the orthographic projections of the multiple anode wires in each group of anode wires on the substrate fall into the same area among the multiple areas; the multiple lamp groups connected to each group of anode wires are respectively electrically connected to different cathode wires.

[0014] According to some exemplary embodiments, the multiple lamp groups are arranged on the base substrate in an array of m rows and n columns; the number of the multiple cathode wirings is M, the number of the multiple anode wirings is m, and the number of the multiple groups of anode wirings is N, wherein m, n and M are all positive integers greater than or equal to 2, m is greater than 2 times of M, and N is the value rounded to the nearest integer after dividing m by M.

[0015] According to some exemplary embodiments, the number of the plurality of regions is N, and N groups of anode wirings are respectively located in the N regions.

[0016] According to some exemplary embodiments, the N groups of anode wirings include at least a first group of anode wirings, a second group of anode wirings, and a third group of anode wirings, the N regions include at least a first region, a second region, and a third region, the orthographic projections of the first group of anode wirings, the second group of anode wirings, and the third group of anode wirings on the substrate fall within the first region, the second region, and the third region, respectively, and the orthographic projection of the first group of anode wirings on the substrate does not overlap with the orthographic projection of the wires in the lamp group on the substrate.

[0017] According to some exemplary embodiments, the orthographic projection of the second group of anode wirings on the base substrate overlaps with the orthographic projection of some of the multiple wires in the lamp group on the base substrate, and the orthographic projection of the third group of anode wirings on the base substrate overlaps with the orthographic projection of another of the multiple wires in the lamp group on the base substrate.

[0018] According to some exemplary embodiments, the anode wire and the cathode wire both extend in a first direction, some of the plurality of in-lamp group wires extend in the first direction, and other of the plurality of in-lamp group wires extend in a second direction intersecting the first direction.

[0019] According to some exemplary embodiments, the plurality of cathode wirings are divided into N-1 groups, and the N-1 groups of cathode wirings are arranged on the base substrate at equal intervals.

[0020] According to some exemplary embodiments, a width of each of the plurality of in-lamp group wires is greater than a width of each of the plurality of anode wires and the plurality of cathode wires.

[0021] In another aspect, a backlight module is provided, comprising:

[0022] substrate;

[0023] a plurality of lamp groups disposed on the substrate, the plurality of lamp groups being arranged in an array on the substrate, each lamp group comprising a plurality of sub-millimeter light emitting diodes, a plurality of internal wires within the lamp group, an external anode, and an external cathode, the plurality of internal wires within the lamp group electrically connecting the plurality of sub-millimeter light emitting diodes in series;

[0024] a plurality of anode wirings, the plurality of anode wirings being electrically connected to external anodes of the plurality of rows of lamp groups;

[0025] A plurality of cathode wirings, each of which is electrically connected to the external cathodes of the plurality of rows of lamp groups.

[0026] wherein, among at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to external cathodes of lamp groups located in different rows, so as to provide cathode signals to the lamp groups located in different rows in a time-division multiplexing manner;

[0027] The same-wiring lamp group includes multiple lamp groups electrically connected to the same cathode wiring, and the same-type anode wiring includes multiple anode wirings connected to the same-wiring lamp group. The positive projection of the same-type anode wiring on the base substrate partially overlaps with the positive projection of the wire in the same lamp group on the base substrate, and the partial overlap makes the parasitic capacitance voltage generated on the same-type anode wiring less than the threshold voltage of the lamp group.

[0028] In another aspect, a display device is provided, comprising the backlight module as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other objects and advantages of the present disclosure will become apparent from the following description of the present disclosure with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present disclosure.

[0030] Figure 1 is a schematic plan view of a lamp assembly according to some exemplary embodiments of the present disclosure;

[0031] Figure 2 is a schematic diagram of a backlight module according to some exemplary embodiments of the present disclosure, which schematically shows an array arrangement of lamp groups in the backlight module;

[0032] Figure 3 is a partial enlarged view of a backlight module according to some exemplary embodiments of the present disclosure, schematically illustrating the positional relationship between a lamp group, an anode wiring, and a cathode wiring;

[0033] Figure 4 The schematic diagram shows the connection between the same wiring lamp group and the anode wiring and cathode wiring;

[0034] Figure 5 is a schematic diagram of multiple regions of a base substrate included in a backlight module according to some exemplary embodiments of the present disclosure;

[0035] Figure 6 is a partially enlarged view of a backlight module according to some exemplary embodiments of the present disclosure;

[0036] Figure 7A 、 Figure 7B and Figure 7C Different embodiments of anode wiring, cathode wiring and wires in a lamp group are schematically shown, wherein the anode wiring falls into the first area;

[0037] Figure 8A 、 Figure 8B and Figure 8C Different embodiments of anode wiring, cathode wiring and wires in the lamp group are schematically shown, wherein the anode wiring falls into the second area;

[0038] Figure 9A 、 Figure 9B and Figure 9C Different embodiments of anode wiring, cathode wiring and wires in the lamp group are schematically shown, wherein the anode wiring falls into the third area;

[0039] Figure 10A 、 Figure 10B and Figure 10C Different embodiments of anode wiring, cathode wiring and wires in the lamp group are schematically shown, wherein the anode wiring falls into the third area;

[0040] Figure 11 Schematically illustrating that no parasitic capacitance is formed between similar anode wirings; and

[0041] Figure 12is a partially enlarged view of a backlight module according to some exemplary embodiments of the present disclosure.

[0042] It should be noted that, for the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the sizes of layers, structures or regions may be enlarged or reduced, that is, these drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0043] In the following description, for the purpose of explanation, many specific details are set forth to provide a comprehensive understanding of the various exemplary embodiments. However, it is apparent that the various exemplary embodiments can be implemented without these specific details or with one or more equivalent arrangements. In other cases, well-known structures and devices are shown in block diagram form to avoid unnecessarily obscuring the various exemplary embodiments. In addition, the various exemplary embodiments can be different, but not necessarily exclusive. For example, the specific shape, configuration, and characteristics of the exemplary embodiment can be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0044] In the accompanying drawings, the sizes and relative sizes of the elements may be exaggerated for clarity and / or descriptive purposes. Thus, the sizes and relative sizes of the individual elements are not necessarily limited to those shown in the drawings. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed differently from the described sequence. For example, two processes described in succession can be performed substantially simultaneously or in an order opposite to the described sequence. In addition, the same reference numerals represent the same elements.

[0045] When an element is described as being "on" another element, "connected to" another element, or "bound to" another element, the element may be directly on the other element, directly connected to the other element, or directly bound to the other element, or there may be an intermediate element. However, when an element is described as being "directly on" another element, "directly connected to" another element, or "directly bound to" another element, there is no intermediate element. Other terms and / or expressions used to describe the relationship between elements should be interpreted in a similar manner, for example, "between" versus "directly between", "adjacent" versus "directly adjacent", or "on" versus "directly on", etc. In addition, the term "connected" may refer to a physical connection, an electrical connection, a communication connection, and / or a fluid connection. In addition, the X-axis, Y-axis, and Z-axis are not limited to the three axes of a rectangular coordinate system, and may be interpreted in a broader sense. For example, the X-axis, Y-axis, and Z-axis may be perpendicular to each other, or may represent different directions that are not perpendicular to each other. For the purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” may be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as XYZ, XYY, YZ, and ZZ. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0046] It should be understood that although the terms first, second, etc. may be used herein to describe different elements, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. For example, a first element may be named a second element, and similarly, a second element may be named a first element without departing from the scope of the exemplary embodiments.

[0047] Herein, the expressions “track”, “wiring”, “conducting wire” and the like may include conductive lines formed of conductive materials, which are generally opaque materials, such as metallic conductive materials such as Cu.

[0048] In this article, inorganic light-emitting diodes refer to light-emitting elements made of inorganic materials, among which LED refers to inorganic light-emitting elements that are different from OLEDs. Specifically, inorganic light-emitting elements can include sub-millimeter light-emitting diodes (Mini Light Emitting Diode, abbreviated as Mini LED in English) and micro light-emitting diodes (Micro Light Emitting Diode, abbreviated as Micro LED in English). Among them, sub-millimeter light-emitting diodes (i.e. Mini LEDs) refer to small light-emitting diodes with a grain size between Micro LEDs and traditional LEDs. Typically, the grain size of Mini LEDs can be between 100 and 300 microns.

[0049] Multiple tiny LEDs are arranged in an array, with every N tiny LEDs forming an area. The brightness of different areas is controlled separately by an integrated circuit. When the multiple tiny LEDs arranged in an array are used as the backlight module of a passive display panel, the contrast of the picture of a liquid crystal display device, for example, can be greatly improved, thereby improving the picture quality.

[0050] The Mini LED backlight module includes multiple mini LEDs arranged in an array, and the multiple mini LEDs are divided into multiple light groups. Figure 1 1 is a schematic plan view of a lamp assembly according to some exemplary embodiments of the present disclosure. Figure 1 As shown, a lamp group 10 may include multiple mini LED lamp beads 1. For example, Figure 1 In the illustrated embodiment, a lamp group 10 includes 9 mini LED lamp beads 1, which are arranged in an array of 3 rows and 3 columns. It should be noted that the number and array arrangement here are only exemplary, and the embodiments of the present disclosure are not limited thereto. In other embodiments, a lamp group 10 may include a smaller number or a larger number of mini LED lamp beads 1. Moreover, the connection method of the multiple mini LED lamp beads 1 included in a lamp group 10 may also be other forms. In addition, the multiple mini LED lamp beads 1 may also be arranged in an array in other ways.

[0051] Continue to refer to Figure 1 Each lamp bead 1 may include a positive electrode 11 and a negative electrode 12. Figure 1 In the embodiment shown in , nine lamp beads 1 can be electrically connected in series. For example, the cathode 12 of the preceding lamp bead 1 is electrically connected to the anode 11 of the following lamp bead 1 via a wire, the anode 11 of the leading lamp bead 1 is electrically connected to the anode wiring, and the cathode 11 of the trailing lamp bead 1 is electrically connected to the cathode wiring.

[0052] In this article, for the convenience of description, the anode electrically connected to the anode wiring in a lamp group is called an external anode, represented by the figure mark 2; the cathode electrically connected to the cathode wiring in a lamp group is called an external cathode, represented by the figure mark 3; the wires in the lamp group used to electrically connect the various mini LED lamp beads in series are called wires within the lamp group, represented by the figure mark 4.

[0053] Thus, in this article, unless otherwise specified, the expression "lamp group" refers to a light-emitting unit formed by electrically connecting multiple mini LED lamp beads in series. A lamp group may include: multiple mini LED lamp beads 1, multiple internal wires 4 of the lamp group for electrically connecting multiple mini LED lamp beads in series, an external anode 2, and an external cathode 3.

[0054] For example, a lamp group may include a plurality of mini LED lamp beads arranged in a p*q matrix, where p and q are both natural numbers greater than or equal to 2. Figure 1 In the embodiment shown, p = 3, and q = 3. In other embodiments, p may not be equal to q.

[0055] A lamp group includes (p*q-1)pq lamp group wires 4, for example, Figure 1 In the embodiment shown, one lamp group includes eight inner lamp group wires 4 for electrically connecting nine mini LED lamp beads in series.

[0056] In this document, unless otherwise specified, the term "anode wiring" refers to a signal line used to transmit an anode voltage signal to an external anode of a lamp group; the term "cathode wiring" refers to a signal line used to transmit a cathode voltage signal (such as a GND signal) to an external cathode of a lamp group.

[0057] It should be noted that Figure 1 A rectangular frame is used to represent the mini LED lamp beads, but it can be understood that the mini LED lamp beads in the embodiments of the present disclosure are not limited to rectangular shapes, and can be other shapes such as circular and polygonal.

[0058] Figure 2 FIG is a schematic diagram of a backlight module according to some exemplary embodiments of the present disclosure, wherein the array arrangement of the lamp groups in the backlight module is schematically shown. Figure 2 As shown, the backlight module may include multiple lamp groups 10. The multiple lamp groups 10 may be arranged in an m*n matrix on a substrate SUB. That is, they may be arranged in a matrix of m rows and n columns on the substrate SUB. For example, the substrate SUB may be a glass substrate. Mini LED backlight products based on glass substrates have advantages such as low cost, mass production, and large size.

[0059] The external anode 2 and the external cathode 3 of each lamp group 10 are electrically connected to the anode wiring A and the cathode wiring K, respectively. Figure 2 Only one anode wiring A7 and one cathode wiring K1 are shown. For example, the backlight module may further include an integrated circuit 7. One end of the anode wiring A is electrically connected to the integrated circuit 7, and the other end is electrically connected to the external anode 2 of the lamp group 10. One end of the cathode wiring K is electrically connected to the external cathode 3 of the lamp group 10. In this way, the anode signal and cathode signal output by the integrated circuit 7 can be transmitted to the external anode 2 and external cathode 3 of the lamp group 10, respectively, thereby controlling the light emission of the lamp group 10.

[0060] like Figure 2 , schematically illustrates the electrical connection between a lamp group 10 located at the 7th row and the 1st column and the integrated circuit 7. For example, the lamp group 10 located at the 7th row and the 1st column can be electrically connected to the integrated circuit 7 via the anode wiring A7 (i.e., the 7th anode wiring) and the cathode wiring K1 (i.e., the 1st cathode wiring).

[0061] In a Mini LED backlight module, there are a large number of lamp groups 10. In the embodiments of the present disclosure, time-sharing multiplexing of cathode wiring can be used to reduce the number of cathode wiring lines, thereby simplifying wiring layout. That is, a single cathode wiring line can be electrically connected to multiple rows of lamp groups 10, providing cathode signals to these rows of lamp groups 10 using time-sharing multiplexing.

[0062] Figure 3 1 is a partially enlarged view of a backlight module according to some exemplary embodiments of the present disclosure, schematically illustrating the positional relationship among lamp groups, anode wirings, and cathode wirings. Figure 4 The schematic diagram shows the connection between the same wiring lamp group and the anode wiring and cathode wiring. Figure 2 For example, in Figure 2 In the embodiment, m running light groups 10 are provided; considering the driving capability of the integrated circuit 7, the number of cathode wirings that the integrated circuit 7 can provide is M. In this case, the m running light groups 10 can be divided into N groups, where N is the integer value of m divided by M.

[0063] For example, in Figure 2 In the embodiment, 24 rows of light groups 10 are provided, that is, m=24; the number of cathode wirings that the integrated circuit 7 can provide is 6, that is, M=6. In this way, the 24 rows of light groups 10 can be divided into 4 (24 / 6) groups.

[0064] like Figure 3 As shown, there are 6 cathode wirings, marked as K1, K2, K3, K4, K5 and K6; there are 24 anode wirings, marked as A1 to A24. Figure 3In the embodiment, the six cathode wirings are concentratedly arranged on one side of the base substrate. The embodiments of the present disclosure are not limited thereto. The six cathode wirings can also be evenly distributed on the base substrate.

[0065] For example, four rows of lamp groups that are equally spaced in the column direction can be connected to one cathode wiring line at the same time. Figure 3 As shown in the figure, lamp groups L1, L7, L13, and L19 are connected to the same cathode wiring K1. Lamp groups L1, L7, L13, and L19 represent the lamp groups 10 in rows 1, 7, 13, and 19, respectively. Lamp groups L2, L8, L14, and L20 are connected to the same cathode wiring K2, and so on.

[0066] The external cathodes of the lamp groups L1 to L6 are electrically connected to the cathode wiring lines K1 to K6, respectively. The external cathodes of the lamp groups L7 to L12 are electrically connected to the cathode wiring lines K1 to K6, respectively, and so on.

[0067] The lamp groups L1 to L24 are electrically connected to the anode wirings A1 to A24, respectively. That is, the anode wirings are not reused.

[0068] In this article, for the convenience of description, multiple lamp groups (or multiple rows of lamp groups) electrically connected to the same cathode wiring are referred to as "same wiring lamp groups", and the anode wiring connected to each lamp group in the "same wiring lamp group" is referred to as "same type of anode wiring". That is, the expression "same wiring lamp group" means multiple lamp groups (or multiple rows of lamp groups) electrically connected to the same cathode wiring, and the expression "same type of anode wiring" means multiple anode wirings connected to multiple lamp groups (or multiple rows of lamp groups) electrically connected to the same cathode wiring. The expression "same group of anode wirings" means multiple anode wirings located in the same area, and the lamp groups connected to these anode wirings are electrically connected to different cathode wirings. For example, in combination with reference Figure 2 and Figure 3 , lamp groups L1, L7, L13, and L19 can be called "lamp groups with the same wiring", anode wirings A1, A7, A13, and A19 can be called "same type anode wiring", and anode wirings A1 to A6 can be called "same group anode wiring".

[0069] Figure 5 FIG. 1 is a schematic diagram of multiple regions of a base substrate included in a backlight module according to some exemplary embodiments of the present disclosure. Figure 6 It is a partial enlarged view of the backlight module according to some exemplary embodiments of the present disclosure. Figure 4 、 Figure 5 and Figure 6In the embodiment of the present disclosure, the backlight module includes: a base substrate SUB; a plurality of lamp groups 10 provided on the base substrate, the plurality of lamp groups being arranged in an array on the base substrate, each lamp group including a plurality of sub-millimeter light-emitting diodes 1, a plurality of lamp group internal wires 2, an external anode 3 and an external cathode 4, the plurality of lamp group internal wires 2 being electrically connected in series to the plurality of sub-millimeter light-emitting diodes 1; a plurality of anode wirings A1 to A24, the plurality of anode wirings being electrically connected to the external anodes of the plurality of rows of lamp groups respectively; a plurality of cathode wirings K1 to K6, the plurality of cathode wirings K1 to K6 The cathode wirings are electrically connected to the external cathodes of multiple rows of lamp groups, respectively, wherein, among at least some of the multiple cathode wirings, the same cathode wiring is electrically connected to the external cathodes of lamp groups located in different rows, so as to provide cathode signals to the lamp groups located in different rows in a time-sharing multiplexing manner; and the same-wiring lamp group includes multiple lamp groups electrically connected to the same cathode wiring, and the same-type anode wiring includes multiple anode wirings connected to the same-wiring lamp group, and the orthographic projection of the same-type anode wiring on the substrate does not overlap with the orthographic projection of the wires in the same lamp group on the substrate.

[0070] Continue to refer to Figure 5 and Figure 6 The plurality of cathode wirings K1 to K6 are arranged at intervals, the base substrate includes a plurality of regions, and any two adjacent regions of the plurality of regions are separated by the orthographic projection of at least one cathode wiring on the base substrate. For example, Figure 5 Area ①, area ②, area ③ and area ④ shown in the figure.

[0071] In an embodiment of the present disclosure, the orthographic projections of the same type of anode wiring on the base substrate are respectively located in different areas of the plurality of areas. For example, the same type of anode wiring A1, A7, A13, and A19 are respectively located in area ④, area ③, area ②, and area ①.

[0072] The plurality of anode wirings A1 to A24 include a plurality of groups of anode wirings, and the orthographic projections of the plurality of anode wirings in each group of anode wirings on the base substrate fall within the same region of the plurality of regions. Figure 6 In the illustrated embodiment, four groups of anode wiring are provided: a first group of anode wiring A19-A24, a second group of anode wiring A13-A18, a third group of anode wiring A7-A12, and a fourth group of anode wiring A1-A6. Each group of anode wiring connects to multiple lamp groups that are electrically connected to different cathode wirings.

[0073] For example, the plurality of lamp groups are arranged on the base substrate SUB in an array of m rows and n columns. The number of the plurality of cathode wirings is M, the number of the plurality of anode wirings is m, and the number of the plurality of anode wiring groups is N, where m, n, and M are all positive integers greater than or equal to 2, m is greater than or equal to 2, and N is the integer value of m divided by M.

[0074] The number of the plurality of regions is N, and N sets of anode wirings are respectively located in the N regions.

[0075] The N groups of anode wiring include at least a first group of anode wiring, a second group of anode wiring and a third group of anode wiring, the N regions include at least a first region, a second region and a third region, the orthographic projections of the first group of anode wiring, the second group of anode wiring and the third group of anode wiring on the base substrate fall within the first region, the second region and the third region respectively, and the orthographic projection of the first group of anode wiring on the base substrate does not overlap with the orthographic projection of the wires in the lamp group on the base substrate.

[0076] The orthographic projection of the second group of anode wiring on the base substrate overlaps with the orthographic projection of some of the multiple wires in the lamp group on the base substrate, and the orthographic projection of the third group of anode wiring on the base substrate overlaps with the orthographic projection of another of the multiple wires in the lamp group on the base substrate.

[0077] Some of the plurality of wires in the lamp group extend along the first direction, and other of the plurality of wires in the lamp group extend along a second direction, and the second direction intersects with the first direction.

[0078] The plurality of cathode wirings are divided into N-1 groups, and the N-1 groups of cathode wirings are arranged on the base substrate at equal intervals.

[0079] Figure 7A 、 Figure 7B and Figure 7C Different implementations of anode wiring, cathode wiring and wires within the lamp group are schematically shown respectively. Figures 7A to 7C The illustrated embodiment is for a lamp group where the anode wiring falls into the first region.

[0080] Reference Figure 7AFor lamp groups whose anode wiring falls into the first area, their cathode wiring can be located on the left. For example, in a lamp group 10, eight internal wires 4 are provided to connect nine mini LED lamp beads 1 in series. In the order of series connection, the eight internal wires 1 of the lamp group can be respectively referred to as the first internal wire 41 of the lamp group, the second internal wire 42 of the lamp group, the third internal wire 43 of the lamp group, the fourth internal wire 44 of the lamp group, the fifth internal wire 45 of the lamp group, the sixth internal wire 46 of the lamp group, the seventh internal wire 47 of the lamp group, and the eighth internal wire 48 of the lamp group. The anode wiring 2 is electrically connected to the anode of the head lamp bead 1 through the via located in the anode connection area 21, and then electrically connected to the tail lamp bead 1 through the first internal wire of the lamp group, the second internal wire of the lamp group, the third internal wire of the lamp group, the fourth internal wire of the lamp group, the fifth internal wire of the lamp group, the sixth internal wire of the lamp group, the seventh internal wire of the lamp group, and the eighth internal wire of the lamp group. The tail lamp bead 1 is electrically connected to the cathode wiring 3 through the via located in the cathode connection area 31.

[0081] The orthographic projection of the first group of anode wiring on the substrate substrate partially overlaps with the orthographic projection of the eighth lamp group internal wire 48 on the substrate substrate. The orthographic projection of the second group of anode wiring on the substrate substrate partially overlaps with the orthographic projection of the sixth lamp group internal wire 46 and the seventh lamp group internal wire 47 on the substrate substrate. The orthographic projection of the third group of anode wiring on the substrate substrate partially overlaps with the orthographic projection of the second lamp group internal wire 42, the third lamp group internal wire 43, the fourth lamp group internal wire 44, and the fifth lamp group internal wire 45 on the substrate substrate. The orthographic projection of the fourth group of anode wiring on the substrate substrate does not overlap with the orthographic projection of any of the first group internal wires on the substrate substrate. In this way, the orthographic projection of similar anode wiring (e.g., A1 / A7 / A13 / A19) on the substrate substrate does not overlap with the orthographic projection of the same lamp group internal wire on the substrate substrate.

[0082] like Figure 7A As shown, some of the wires within the lamp groups (e.g., wires 41, 42, 45, and 47) extend in a first direction (e.g., row direction), while some of the wires within the lamp groups (e.g., wires 43, 44, 46, and 48) extend in a second direction (e.g., column direction). This extension ensures that the orthographic projections of similar anode wiring (e.g., A1, A7, A13, and A19) on the substrate do not overlap with the orthographic projections of the same lamp group wires on the substrate.

[0083] Reference Figure 7BFor lamp groups whose anode wiring falls within the first region, their cathode wiring can be located in the middle. The fourth intra-lamp group wires 44 extend in an oblique direction (relative to the row or column direction). By designing the intra-lamp group wires, it is possible to ensure that the orthographic projections of similar anode wiring (e.g., A1 / A7 / A13 / A19) on the substrate do not overlap with the orthographic projections of the same intra-lamp group wires on the substrate.

[0084] Reference Figure 7C , for the lamp group whose anode wiring falls into the first area, its cathode wiring can be located on the right.

[0085] Figure 8A 、 Figure 8B and Figure 8C Different implementations of anode wiring, cathode wiring and wires within the lamp group are schematically shown respectively. Figures 8A to 8C The embodiment shown is for a lamp group where the anode wiring falls into the second area. Figure 8A , for the lamp group whose anode wiring falls into the second area, its cathode wiring can be located on the left. Figure 8B , for the lamp group whose anode wiring falls into the second area, its cathode wiring can be located in the middle. Figure 8C , for the lamp group whose anode wiring falls into the second area, its cathode wiring can be located on the right.

[0086] Figure 9A 、 Figure 9B and Figure 9C Different implementations of anode wiring, cathode wiring and wires within the lamp group are schematically shown respectively. Figures 9A to 9C The embodiment shown is for a lamp group where the anode wiring falls into the third zone. Figure 9A , for the lamp group whose anode wiring falls into the third area, its cathode wiring can be located on the left. Figure 9B For the lamp group whose anode wiring falls into the third area, its cathode wiring can be located in the middle. Figure 9C , for the lamp group whose anode wiring falls into the third area, its cathode wiring can be located on the right.

[0087] Figure 10A 、 Figure 10B and Figure 10C Different implementations of anode wiring, cathode wiring and wires within the lamp group are schematically shown respectively. Figures 10A to 10C The embodiment shown is directed to a lamp group where the anode wiring falls into the fourth zone. Figure 10A , for the lamp group whose anode wiring falls into the fourth area, its cathode wiring can be located on the left. Figure 10B , for the lamp group whose anode wiring falls into the fourth area, its cathode wiring can be located in the middle. Figure 10C, for the lamp group whose anode wiring falls into the fourth area, its cathode wiring can be located on the right.

[0088] The above embodiments can refer to Figures 7A to 7C The description is not repeated here.

[0089] For example, the anode wiring and the cathode wiring both extend in a first direction.

[0090] For example, the width of each of the plurality of wires in the lamp group is greater than the width of each of the plurality of anode wires and the plurality of cathode wires, which is beneficial to heat dissipation of the mini LED lamp beads.

[0091] In the embodiment of the present disclosure, the orthographic projection of the same type of anode wiring (e.g. A1 / A7 / A13 / A19) on the substrate does not overlap with the orthographic projection of the same lamp group wire on the substrate. Therefore, no parasitic capacitance will be formed between the same type of anode wiring, such as Figure 11 As shown, for the same type of anode wirings A7 and A13 connected to the same cathode wiring K1, since there is no parasitic capacitance between the anode wirings A7 and A13, the capacitance voltage caused by the parasitic capacitance is avoided, that is, the generation of parasitic voltage in the anode wiring A13 is avoided, thereby preventing the LED L13 from being abnormally lit.

[0092] Figure 12 : is a partial enlarged view of the backlight module according to some exemplary embodiments of the present disclosure. Figure 12 In the embodiment shown, the orthographic projection of the same type of anode wiring on the substrate and the orthographic projection of the wire in the same lamp group on the substrate can partially overlap, and the partial overlap makes the parasitic capacitance voltage generated on the same type of anode wiring less than the threshold voltage of the lamp group. In other words, due to the partial overlap, the same type of anode wiring (for example Figure 11 A parasitic voltage may be generated between A7 and A13 in the circuit. However, because the overlapping area is small enough, the resulting parasitic voltage is small and below the threshold voltage of the lamp group. This also prevents the LED from lighting abnormally.

[0093] In the embodiment of the present disclosure, the following driving timing may be adopted.

[0094] Integrated circuit 7 sequentially connects cathode wirings K1-K6, leaving unconnected cathode wirings in a high-impedance state. Simultaneously, it sequentially supplies power to each anode wiring A1-A24, depending on the desired display / illumination pattern. For example, it can output a series of modulated square wave signals in a PWM mode to illuminate the LEDs.

[0095] Divide the area where the lamp groups can be wired into several groups. Place similar anode wiring in different areas. For a 31.2-inch MINI LED backlight product, for example, the lamp group area can be divided into four (24 / 6) zones. Then, drive these multiple lamp groups row by row without generating parasitic voltages.

[0096] Some exemplary embodiments of the present disclosure also provide a display device.

[0097] The display device may be any product or component having a display function. For example, the display device may be a smart phone, a mobile phone, a navigation device, a television (TV), a car stereo, a laptop computer, a tablet computer, a portable multimedia player (PMP), a personal digital assistant (PDA), etc.

[0098] It should be understood that the display device according to some exemplary embodiments of the present disclosure has all the features and advantages of the above-mentioned backlight module. These features and advantages can be referred to in the above description of the light-emitting substrate and will not be repeated here.

[0099] As used herein, the terms "substantially," "about," "approximately," and other similar terms are used as terms of approximation rather than as terms of degree, and are intended to account for the inherent deviations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art. To account for factors such as process fluctuations, measurement problems, and errors associated with the measurement of a particular quantity (i.e., limitations of the measurement system), "about" or "approximately," as used herein, are inclusive of the stated value and mean within an acceptable range of deviation for the particular value as determined by one 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.

[0100] Although some embodiments according to the general inventive concept of the present disclosure have been illustrated and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the general inventive concept of the present disclosure, the scope of which is defined by the claims and their equivalents.

Claims

1. A backlight module, characterized in that: The backlight module includes: substrate; a plurality of lamp groups disposed on the substrate, the plurality of lamp groups being arranged in an array on the substrate, each lamp group comprising a plurality of sub-millimeter light emitting diodes, a plurality of internal wires within the lamp group, an external anode, and an external cathode, the plurality of internal wires within the lamp group electrically connecting the plurality of sub-millimeter light emitting diodes in series; a plurality of anode wirings, the plurality of anode wirings being electrically connected to external anodes of the plurality of rows of lamp groups; A plurality of cathode wirings, each of which is electrically connected to the external cathodes of the plurality of rows of lamp groups. wherein, among at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to external cathodes of lamp groups located in different rows, so as to provide cathode signals to the lamp groups located in different rows in a time-division multiplexing manner; and The same wiring lamp group includes a plurality of lamp groups electrically connected to the same cathode wiring, the same type of anode wiring includes a plurality of anode wirings connected to the same wiring lamp group, and the orthographic projection of the same type of anode wiring on the base substrate does not overlap with the orthographic projection of the wires in the same lamp group on the base substrate; The plurality of cathode wirings are arranged at intervals, the base substrate comprises a plurality of regions, and any two adjacent regions of the plurality of regions are separated by an orthographic projection of at least one cathode wiring on the base substrate; The orthographic projections of the same type of anode wiring on the base substrate are respectively located in different areas among the plurality of areas.

2. The backlight module according to claim 1, wherein: The plurality of anode wirings include a plurality of groups of anode wirings, and the orthographic projections of the plurality of anode wirings in each group of anode wirings on the base substrate fall within the same region of the plurality of regions; The plurality of lamp groups connected to each set of anode wirings are electrically connected to different cathode wirings.

3. The backlight module according to claim 1 or 2, wherein: The plurality of lamp groups are arranged on the base substrate in an array of m rows and n columns; The plurality of anode wirings include a plurality of groups of anode wirings, the number of the plurality of cathode wirings is M, the number of the plurality of anode wirings is m, the number of the plurality of groups of anode wirings is N, Wherein, m, n and M are all positive integers greater than or equal to 2, m is greater than or equal to 2 times M, and N is the integer value obtained by dividing m by M.

4. The backlight module according to claim 3, wherein: The number of the plurality of regions is N, and N sets of anode wirings are respectively located in the N regions.

5. The backlight module according to claim 4, wherein: The N groups of anode wirings include at least a first group of anode wirings, a second group of anode wirings, and a third group of anode wirings, and the N regions include at least a first region, a second region, and a third region. The orthographic projections of the first group of anode wirings, the second group of anode wirings, and the third group of anode wirings on the base substrate fall within the first area, the second area, and the third area, respectively. The orthographic projection of the first group of anode wirings on the base substrate does not overlap with the orthographic projection of the inner wires of the lamp group on the base substrate.

6. The backlight module according to claim 5, wherein: The orthographic projection of the second group of anode wiring on the base substrate overlaps with the orthographic projection of some of the plurality of wires in the lamp group on the base substrate. The orthographic projection of the third group of anode wires on the base substrate overlaps with the orthographic projection of other ones of the plurality of in-lamp group wires on the base substrate.

7. The backlight module according to claim 3, wherein: The anode wiring and the cathode wiring both extend along a first direction, Some of the plurality of wires in the lamp group extend along the first direction, and other of the plurality of wires in the lamp group extend along a second direction, and the second direction intersects with the first direction.

8. The backlight module according to claim 3, wherein: The plurality of cathode wirings are divided into N-1 groups, and the N-1 groups of cathode wirings are arranged on the base substrate at equal intervals.

9. The backlight module according to claim 7, wherein: A width of each of the plurality of in-lamp group wires is greater than a width of each of the plurality of anode wires and the plurality of cathode wires.

10. A backlight module, characterized in that: The backlight module includes: substrate; a plurality of lamp groups disposed on the substrate, the plurality of lamp groups being arranged in an array on the substrate, each lamp group comprising a plurality of sub-millimeter light emitting diodes, a plurality of internal wires within the lamp group, an external anode, and an external cathode, the plurality of internal wires within the lamp group electrically connecting the plurality of sub-millimeter light emitting diodes in series; a plurality of anode wirings, the plurality of anode wirings being electrically connected to external anodes of the plurality of rows of lamp groups; A plurality of cathode wirings, each of which is electrically connected to the external cathodes of the plurality of rows of lamp groups. wherein, among at least some of the plurality of cathode wirings, the same cathode wiring is electrically connected to external cathodes of lamp groups located in different rows, so as to provide cathode signals to the lamp groups located in different rows in a time-division multiplexing manner; The same wiring lamp group includes a plurality of lamp groups electrically connected to the same cathode wiring, the same type of anode wiring includes a plurality of anode wirings connected to the same wiring lamp group, the orthographic projections of the same type of anode wirings on the base substrate partially overlap with the orthographic projections of wires in the same lamp group on the base substrate, and the partial overlap causes a parasitic capacitance voltage generated on the same type of anode wiring to be less than a threshold voltage of the lamp group; The plurality of cathode wirings are arranged at intervals, the base substrate comprises a plurality of regions, and any two adjacent regions of the plurality of regions are separated by an orthographic projection of at least one cathode wiring on the base substrate; The orthographic projections of the same type of anode wiring on the base substrate are respectively located in different areas among the plurality of areas.

11. A display device comprising the backlight module according to any one of claims 1 to 10.

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