Backlight source display method and device

Abstract

The present application discloses a display method and device of a backlight source, which belongs to the field of display technology. The backlight source includes: a substrate; a plurality of electrode traces arranged on the substrate; a plurality of light-emitting unit groups arranged on the substrate, the plurality of light-emitting unit groups are connected to the plurality of electrode traces, and the plurality of light-emitting unit groups are configured to emit light under the drive of the drive signals transmitted by the plurality of electrode traces; wherein, among the plurality of electrode traces, the width of at least two electrode traces is positively correlated with the length. When the electrode trace is longer, its width is wider, so that the resistance of electrode traces of different lengths can be balanced, and then the voltage difference loaded on different light-emitting unit groups will also be reduced, and the brightness uniformity of different light-emitting unit groups is higher. The problem of poor brightness uniformity of the overall backlight source in the related art is solved, and the effect of improving the overall brightness uniformity of the backlight source is achieved.

Description

[0001] This application is a divisional application of an invention patent application with an application date of September 30, 2019, application number: 201910939338.6, and invention name: “Display method and device of backlight source”. Technical Field

[0002] The present invention relates to the field of display technology, and in particular to a backlight source display method and device. Background Art

[0003] Micro-LED (English: Micro Light Emitting Diode, abbreviated: Micro-LED) technology is LED miniaturization and matrix technology. It means that with the miniaturization of LED, a partitionable backlight source is proposed. The backlight source can be divided into multiple light zones, each of which can be controlled separately, thereby realizing high dynamic range image display (English: High-Dynamic Range, abbreviated: HDR). Since small light-emitting diodes have high brightness, high color gamut and high reliability, combining Micro-LED technology with liquid crystal displays can significantly improve the contrast of display devices.

[0004] A backlight source in the related art includes a base substrate having a plurality of anode wirings and a plurality of cathode wirings, the plurality of anode wirings and the cathode wirings being connected to a driving component, the base substrate being divided into a plurality of lamp areas, each lamp area being provided with at least one light-emitting unit, and the light-emitting units in each lamp area being respectively connected to an anode wiring and a cathode wiring.

[0005] In the process of implementing the present invention, the inventors found that the above method has at least the following defects: the wiring distances between the light-emitting units and the driving components in each lamp area are different, resulting in different voltages loaded on the light-emitting units, which in turn leads to poor overall brightness uniformity of the backlight source. Summary of the invention

[0006] The embodiment of the present invention provides a backlight display method and device to solve the problem of poor brightness uniformity of the overall backlight in the related art. The technical solution is as follows:

[0007] According to a first aspect of the present invention, there is provided a backlight source, the backlight source comprising:

[0008] substrate substrate;

[0009] A plurality of electrode traces disposed on the substrate;

[0010] A plurality of light-emitting unit groups are arranged on the substrate, each of the light-emitting unit groups includes at least one light-emitting unit, the plurality of light-emitting unit groups are connected to the plurality of electrode wires, and the plurality of light-emitting unit groups are configured to emit light under the driving of driving signals transmitted by the plurality of electrode wires;

[0011] Among the plurality of electrode lines, the width and length of at least two electrode lines are positively correlated.

[0012] Optionally, the plurality of electrode wirings include a plurality of anode wirings and a plurality of cathode wirings, and the widths of the plurality of anode wirings are positively correlated with their lengths.

[0013] Optionally, the plurality of light emitting unit groups are arranged in rows and columns on the base substrate, wherein in any column of light emitting unit groups, every m light emitting unit groups are connected to one of the anode wirings, and m is an integer greater than 1.

[0014] Optionally, the plurality of anode wires connected to any column of light-emitting unit groups are arranged in ascending order of length along a specified direction, and any two adjacent anode wires satisfy the length formula:

[0015] m*m / W n+1 +m*(m+1) / 2 / (W n +W n+1 +sp) = m*(m+1) / (2W n );

[0016] Among them, W n is the width of the shorter anode line of any two adjacent anode lines, W n+1 is the width of the longer anode wiring of any two adjacent anode wirings, n is an integer greater than or equal to 1, and sp is the spacing between any two electrode wirings on the substrate.

[0017] Optionally, any column of the light-emitting unit groups is connected to Q anode wires, and the kth anode wire arranged in sequence along the specified direction satisfies the voltage drop formula:

[0018] Where k≤Q;

[0019] IR≤IB;

[0020] Where IR is the voltage drop of the kth anode line away from the connection end of the driver component, IB is the specified voltage drop, and W k is the width of the kth anode line, Rs is the sheet resistance of the anode line, I mis the current value in the light emitting unit group at the maximum gray scale of the backlight source, and L is the length of each light emitting unit group in any column of the light emitting unit groups in the arrangement direction of the light emitting unit groups in any column.

[0021] Optionally, the specified pressure drop satisfies the formula:

[0022] IB=(I m -I m-1 ) / 2;

[0023] Among them, I m-1 is the current value in the light emitting unit group at the gray scale adjacent to the maximum gray scale.

[0024] Optionally, the multiple anode wires connected to any column of light-emitting unit groups are arranged in sequence along a specified direction in ascending order of length, and among the multiple anode wires connected to any column of light-emitting unit groups, the anode wire with the shortest length is a straight line, and the other anode wires except the anode wire with the shortest length are L-shaped.

[0025] Optionally, the line widths of the multiple cathode wirings are equal.

[0026] Optionally, the light-emitting unit is a small light-emitting diode.

[0027] According to a second aspect of the present invention, there is provided a display device, comprising a display panel and a backlight source as described in any one of the first aspects.

[0028] The technical solution provided by the embodiment of the present invention may have the following beneficial effects:

[0029] A backlight source is provided, the backlight source comprising a plurality of electrode traces arranged on a substrate for providing driving signals to a plurality of light-emitting unit groups. Since the width of the plurality of electrode traces is positively correlated with the length, that is, the longer the electrode traces are, the wider their widths are. Thus, the resistances of the electrode traces of different lengths can be balanced, and the voltage difference between the voltages applied to the different light-emitting unit groups can be reduced, and the brightness uniformity of the different light-emitting unit groups is higher. The problem of poor brightness uniformity of the overall backlight source in the related art is solved, and the effect of improving the brightness uniformity of the overall backlight source is achieved.

[0030] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0032] Figure 1is a schematic structural diagram of a backlight source provided by an embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of another backlight source provided by an embodiment of the present invention;

[0034] Figure 3 It is a schematic diagram of the structure of multiple anode wirings in a column of light-emitting unit groups provided by an embodiment of the present invention;

[0035] Figure 4 is a top view of electrode routing on a substrate provided by an embodiment of the present invention;

[0036] Figure 5 yes Figure 2 A schematic structural diagram of a light emitting unit group 131;

[0037] Figure 6 yes Figure 2 A side view of the backlight shown;

[0038] Figure 7 It is a structural schematic diagram of a display device provided by an embodiment of the present invention.

[0039] The above drawings have shown clear embodiments of the present invention, which will be described in more detail below. These drawings and text descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0040] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0041] Figure 1 : is a schematic diagram of the structure of a backlight source provided by an embodiment of the present invention. The backlight source may include:

[0042] Base substrate 11.

[0043] A plurality of electrode traces 12 are disposed on the base substrate 11 .

[0044] A plurality of light-emitting unit groups 13 are arranged on the base substrate 11, each light-emitting unit group includes at least one light-emitting unit, the plurality of light-emitting unit groups 13 are connected to the plurality of electrode traces 12, and the plurality of light-emitting unit groups 13 are configured to emit light under the drive of the drive signal transmitted by the plurality of electrode traces 12.

[0045] Among the plurality of electrode traces 12, the width of at least two electrode traces is positively correlated with the length thereof, that is, among the at least two electrode traces, the electrode trace with a longer relative length has a wider width.

[0046] The electrode trace 12 and the light emitting unit group 13 may be located in different layers, and the electrode trace 12 may be connected to the light emitting unit group 13 through the via x and the connecting wire 15 , and the connecting wire 15 and the light emitting unit group 13 are in the same layer.

[0047] In summary, an embodiment of the present invention provides a backlight source, which includes a plurality of electrode traces arranged on a substrate for providing drive signals for a plurality of light-emitting unit groups. Since the width of the plurality of electrode traces is positively correlated with the length, that is, the longer the electrode trace, the wider its width is, so that the resistance of the electrode traces of different lengths can be balanced, and then the voltage difference loaded on different light-emitting unit groups will also be reduced, and the brightness uniformity of different light-emitting unit groups is higher. The problem of poor overall brightness uniformity of the backlight source in the related art is solved, and the effect of improving the overall brightness uniformity of the backlight source is achieved.

[0048] Please refer to Figure 2 , which shows a schematic diagram of the structure of another backlight source provided by an embodiment of the present invention. The backlight source 10 is Figure 1 Some adjustments were made based on the backlight shown.

[0049] Optionally, the plurality of electrode traces include a plurality of anode traces 121, 122 and a plurality of cathode traces 123, 124, and the width of the plurality of anode traces 121, 122 is positively correlated with the length. Each light-emitting unit group 131, 132, 133 and 134 can operate normally when connected to the anode trace and the cathode trace at the same time, so the plurality of anode traces 121, 122 and the plurality of cathode traces 123, 124 are respectively connected to the light-emitting unit group. The width of the electrode trace has a certain relationship with the magnitude of its voltage drop. The width of the anode trace and the cathode trace in the related art are equal, and the current flowing through all the electrode traces is the same, which results in the light-emitting unit with a longer connected electrode trace having a smaller voltage loaded thereon. Since the voltage loaded on the light-emitting unit is positively correlated with the brightness of the light emitted by the light-emitting unit, the brightness of the light-emitting unit with a longer connected electrode trace in the related art will also be smaller, which will result in poor brightness uniformity of the backlight source.

[0050] In an embodiment of the present invention, the width of multiple anode wirings is positively correlated with their lengths, that is, the longer the anode wiring is, the wider it is. The wider the anode wiring is, the lower the resistance is, and the voltage difference between different electrode wirings is correspondingly reduced, thereby improving the uniformity between electrodes.

[0051] In addition, since the load of the anode line is higher than that of the cathode line, changing the width of the anode line can achieve a more obvious effect. The voltage difference between different electrode lines can also be changed by changing the width of the cathode line, which is not limited in the embodiment of the present invention.

[0052] Optionally, multiple light-emitting unit groups are arranged in rows and columns on the substrate. One side of the multiple light-emitting unit groups arranged in rows and columns may be provided with a driving component connection terminal 14 connected to each electrode wiring, and the driving component connection terminal 14 is also connected to the driving component ( Figure 2 The driving component can send a driving signal to the light-emitting unit group through the electrode wiring.

[0053] Among them, in any column of light-emitting unit groups, every m light-emitting unit groups are connected to an anode wiring, and m is an integer greater than 1. Multiple light-emitting unit groups can be arranged in a layout of M rows * N columns on the substrate, and multiple light-emitting unit groups 131, 132, 133 and 134 in each column are connected to multiple anode wirings 121, 122 and multiple cathode wirings 123, 124. In the related art, each of the multiple light-emitting unit groups in each column is connected to an anode wiring and a cathode wiring, respectively. This connection method requires a large number of wirings. When the area of ​​the substrate is constant, the deployment of multiple electrode wirings is relatively dense. For example, the substrate substrate can be a transparent substrate. Further, the substrate substrate can be made of a light-guiding and non-metallic material with a certain degree of firmness, such as glass, quartz, transparent resin, etc., which is not limited in the embodiments of the present invention.

[0054] In the embodiment of the present invention, a 1:P MUX (multiple connector) design is used for electrode wiring connection, wherein P means that each column of light-emitting unit groups includes P anode wirings and M / P cathode wirings, wherein M / P light-emitting unit groups share one anode wiring, one anode wiring is sequentially connected to multiple light-emitting unit groups, and one cathode wiring is cross-connected to multiple light-emitting unit groups, that is, multiple light-emitting unit groups connected to the same anode wiring are not connected to the same cathode wiring, thereby avoiding the inability to control a certain light-emitting unit group individually. Figure 2For example, the 8 light-emitting unit groups on the substrate 11 are arranged in a layout of 4 rows * 2 columns. When 1:2 MUX is adopted, P is 2. At this time, each column of the light-emitting unit group contains 2 anode wirings and 2 cathode wirings. Every 2 light-emitting unit groups share one anode wiring. The light-emitting unit groups 131 and 132 are connected to the anode wiring 121, the light-emitting unit groups 133 and 134 are connected to the anode wiring 122, and the cathode wiring is cross-connected with multiple light-emitting unit groups, that is, the cathode wiring 123 is connected to the light-emitting unit groups 131 and 133, and the cathode wiring 124 is connected to the light-emitting unit groups 132 and 134.

[0055] The above-mentioned MUX structure means that during the conduction time of each gate line in the display backplane, that is, during the period of scanning a row of light-emitting unit groups, a group of light-emitting unit groups corresponding to each driving component connection end can be controlled to be turned on in turn through multiple driving component connection ends, so that the control signal of the control driving component is provided to the driving component connection by the data signal output terminal, so that each driving component connection end provides data signals to multiple adjacent light-emitting unit groups in a row in turn through the corresponding electrode wiring, thereby realizing the structure of the driving component driving multiple columns of light-emitting unit groups through one driving component connection end, that is, a multi-way connector structure.

[0056] Optionally, a plurality of anode wires connected to any column of light-emitting unit groups are arranged in ascending order of length along a specified direction, and any two adjacent anode wires satisfy the length formula:

[0057] m*m / W n+1 +m*(m+1) / 2 / (W n +W n+1 +sp) = m*(m+1) / (2W n );

[0058] Among them, W n W is the width of the shorter anode line among any two adjacent anode lines. n+1 is the width of the longer anode line among any two adjacent anode lines, n is an integer greater than or equal to 1, and sp is the spacing between any two electrode lines on the substrate. The width of the anode line with the shortest length among the multiple anode lines connected to each column of the light-emitting unit group can be a preset value, which can be set by the staff based on experience. The width of the adjacent anode line can be obtained based on the preset value and the above-mentioned length formula, and in this way, the width of each anode line connected to each column of the light-emitting unit group can be obtained. sp is the spacing between any two electrode lines on the substrate, which is usually determined by the manufacturing process.

[0059] Optionally, any column of light-emitting unit groups is connected to Q anode wires, and the kth anode wire arranged in sequence along a specified direction satisfies the voltage drop formula:

[0060]

[0061] Where k≤Q;

[0062] IR≤IB;

[0063] Where IR is the voltage drop of the kth anode line away from the driver component connection end, IB is the specified voltage drop, and W k is the width of the kth anode trace, Rs is the sheet resistance of the anode trace, I m is the current value in the light emitting unit group at the maximum gray scale of the backlight source, and L is the length of each light emitting unit group in any column of light emitting unit groups in the arrangement direction of any column of light emitting unit groups. Wherein, k≤Q means k=1, 2, 3... or Q.

[0064] Optionally, specify a voltage drop that satisfies the formula:

[0065] IB=(I m -I m-1 ) / 2;

[0066] Among them, I m-1 is the current value in the light-emitting unit group at the grayscale adjacent to the maximum grayscale. That is, the specified voltage drop must meet half of the difference between the current value in the light-emitting unit group at the maximum grayscale and the current value in the light-emitting unit group at the grayscale adjacent to the maximum grayscale. Grayscale refers to the brightness change between the brightest and darkest brightness, divided into several parts, so as to facilitate the screen brightness control corresponding to the signal input. The maximum grayscale is the grayscale with the largest value in the grayscale hierarchy. For example, when the grayscale hierarchy is 255, the maximum grayscale is grayscale 255, and the grayscale adjacent to the maximum grayscale is grayscale 254. The specified voltage drop must meet half of the difference between the current value in the light-emitting unit group at grayscale 255 and the current value in the light-emitting unit group at grayscale 254. The specified voltage drop can also be a pre-set voltage drop value, and the pre-set voltage drop value should also meet the above formula.

[0067] After calculating the width value of each anode trace according to the above-mentioned anode trace length formula, the voltage drop of each anode trace can be obtained by the above-mentioned voltage drop formula, and it can be determined whether the voltage drop is less than the specified voltage drop. If the voltage drop of a certain anode trace is greater than the specified voltage drop, the width value of the anode trace with the shortest length can be reselected, and the width values ​​of the remaining anode traces can be recalculated based on the width value. In this way, the width of each anode trace that satisfies the above-mentioned voltage drop formula can be determined. When selecting the width value of the anode trace with the shortest length, the maximum width that makes each anode trace satisfy the above-mentioned voltage drop formula can be selected, so that the resistance of the anode trace can be reduced.

[0068] Optionally, the multiple anode wires connected to any column of light-emitting unit groups are arranged in ascending order of length along a specified direction, and among the multiple anode wires connected to any column of light-emitting unit groups, the anode wire with the shortest length is in a straight line, and the other anode wires except the anode wire with the shortest length are in an L shape. The electrode wires in the related technology are all straight wires with equal line width, and the electrode wires are usually thin and are only used to realize the electrical connection between the light-emitting unit and the driving component. However, there is actually a lot of space on the substrate substrate. In the embodiment of the present invention, the other anode wires except the anode wire with the shortest length are arranged in an L shape, which can make greater use of the space. Figure 3 As shown, it is a schematic diagram of the structure of multiple anode wirings in a column of light-emitting unit groups. Figure 3 4 anode wires connected to a column of light-emitting unit groups are shown in FIG. 3 . Except for the first wire 31 which is the shortest in length and is in a straight line shape, the remaining anode wires 32, 33 and 34 are all in an L shape. This can greatly utilize the space on the substrate to increase the width of the wires. Figure 4 As shown, it is a top view of the electrode wiring on the substrate. 41 is a driving component connection end connected to the cathode wiring, 421 and 422 are driving component connection ends connected to the anode wiring, driving component connection end 421 is connected to the anode wiring 44 through a via hole, and driving component connection end 422 is connected to the anode wiring 45 through a via hole. 43 is a light-emitting unit, 44 is an anode wiring (such as Figure 3 The anode wiring 31 in the figure), the length of the anode wiring 45 is longer than that of the anode wiring 44, and its width is also wider than that of the anode wiring 44. The driving component connection terminal 41 is connected to the cathode wiring (not shown in the figure) through a via.

[0069] Optionally, the line widths of multiple cathode traces are equal. Since the current of the cathode trace is small, in order to reduce the complexity of the process, the line widths of the multiple cathode traces can be set to be equal. The width of the cathode trace can be calculated by the total width of the electrode traces on the substrate substrate and the width of each anode trace. The specific calculation method is as follows: add the width of each anode trace, use the total width of the electrode traces on the substrate substrate minus the sum of the widths of multiple anode traces, and the total width of the multiple cathode traces is obtained. Divide the total width by the number of cathode traces to obtain the width of each cathode trace. Using this method, there is no need to calculate the width of the cathode traces one by one, which simplifies the process.

[0070] Optionally, the light-emitting unit is a small light-emitting diode. The light-emitting unit group is composed of a plurality of light-emitting units, and the plurality of light-emitting units are connected in series. The series connection is to connect the various components in the circuit one by one, that is, to connect the plurality of light-emitting units in the light-emitting unit group one by one end to end in sequence. The series connection can reduce the current and reduce the power consumption. The plurality of light-emitting units can be small light-emitting diodes (English: Mini Light Emitting Diode, abbreviated as: Mini LED), which are also called "sub-millimeter light-emitting diodes". Compared with conventional-sized light-emitting diodes, small light-emitting diodes are smaller in size, lighter in weight, thinner and more energy-efficient.

[0071] Compared with conventional-sized LEDs, the use of small LEDs as light-emitting units in the backlight source in the embodiments of the present invention can increase the number of light zones in the backlight source, thereby improving the HDR effect of the display device using the backlight source. In addition, the light-emitting units in the embodiments of the present invention can also be conventional-sized LEDs or micro-LEDs that are smaller in size than small-sized LEDs, and the embodiments of the present invention are not limited thereto.

[0072] Figure 5 for Figure 2 Schematic diagram of the structure of a light emitting unit group 131. The light emitting unit group 131 includes 9 light emitting units 1311, and the 9 light emitting units 1311 are connected in series in a 3*3 arrangement. The light emitting units may also be other numbers or other arrangements. For example, multiple light emitting units may also be connected and arranged in a 4*4 or 6*6 arrangement. In addition, multiple light emitting units in each light emitting unit group may also be connected in parallel or in a combination of series and parallel, which is not limited in the embodiment of the present invention.

[0073] The number of light-emitting units included in each light-emitting unit group may be set based on the area of ​​the base substrate and the total number of light-emitting units, which is not limited in the embodiment of the present invention.

[0074] Figure 6 yes Figure 2The side view of the backlight source shown in FIG. The backlight source includes a first metal layer 21, a first insulating layer 22, a second insulating layer 23, a second metal layer 24 and backlight source light-emitting units 251, 252, wherein the first metal layer 21 includes an anode wiring 211 and a cathode wiring 212, the light-emitting unit 251 is connected to the anode wiring 211 through a via, and the light-emitting unit 252 is connected to the cathode wiring 212 through a via. The first insulating layer 22 can be an organic resin layer or a superimposed organic resin layer and an inorganic layer, which can avoid mutual interference between the first metal layer 21 and the second metal layer 24, and can ensure the flatness of the backlight source during the transfer process. When the first insulating layer 22 is a superimposed organic resin layer and an inorganic layer, usually, we can use two mask processes to manufacture the organic resin layer and the inorganic layer respectively, which can effectively prevent the generation of bubbles. The above-mentioned one-time mask process can include: photoresist coating, exposure, development, etching and photoresist stripping. Processing the organic resin layer and the inorganic layer through a mask process includes: coating a layer of photoresist on the material layer to form a photoresist layer, exposing the photoresist layer using a mask plate so that the photoresist layer forms a completely exposed area and a non-exposed area, and then using a development process to completely remove the photoresist in the completely exposed area and retain all the photoresist in the non-exposed area, etching the area corresponding to the completely exposed area on the material layer using an etching process, and finally stripping the photoresist in the non-exposed area to obtain a corresponding structure. Here, the photoresist is a positive photoresist as an example for explanation. When the photoresist is a negative photoresist, the process of a patterning process can refer to the description of this paragraph, and the embodiment of the present invention will not be repeated here.

[0075] In summary, an embodiment of the present invention provides a backlight source, which includes a plurality of electrode traces arranged on a substrate for providing drive signals for a plurality of light-emitting unit groups. Since the width of the plurality of electrode traces is positively correlated with the length, that is, the longer the electrode trace, the wider its width is, so that the resistance of the electrode traces of different lengths can be balanced, and then the voltage difference loaded on different light-emitting unit groups will also be reduced, and the brightness uniformity of different light-emitting unit groups is higher. The problem of poor overall brightness uniformity of the backlight source in the related art is solved, and the effect of improving the overall brightness uniformity of the backlight source is achieved.

[0076] like Figure 7 As shown, it is a schematic diagram of the structure of a display device provided by an embodiment of the present invention, and the display device may include a display panel 30 and the above Figure 1 or Figure 2 The backlight source 10 shown is shown. The display panel may include a liquid crystal display panel (English: Liquid Crystal Display; abbreviated: LCD).

[0077] The backlight source 10 may be used to provide light 40 to the display panel 30 , and the display panel 30 is used to realize a display function through the light 40 provided by the backlight source 10 .

[0078] The display device may be a touch screen, a display, a mobile phone, a tablet computer, a television, a laptop computer, a digital photo frame, a smart wearable device or a navigation product, etc.

[0079] In embodiments of the present invention, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0080] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention is indicated by the claims.

[0081] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A backlight source, characterized in that: The backlight source comprises: substrate substrate; A plurality of electrode traces are arranged on the substrate, the plurality of electrode traces include a first electrode trace and a second electrode trace, and the width and length of at least two of the plurality of electrode traces are positively correlated; A plurality of light-emitting unit groups are arranged on the substrate, each of the light-emitting unit groups includes at least two light-emitting units, the plurality of light-emitting unit groups are connected to the plurality of electrode wires, and the plurality of light-emitting unit groups are configured to emit light under the driving of driving signals transmitted by the plurality of electrode wires; The multiple light-emitting unit groups are arranged in rows and columns on the base substrate. In any column of the light-emitting unit groups, every m light-emitting unit groups are connected to one of the first electrode wires, and m is an integer greater than 1. The light-emitting unit groups in any column correspond to P first electrode wires and M / P second electrode wires. The multiple light-emitting unit groups connected to the same first electrode wire are respectively connected to different second electrode wires, and M is the number of rows of the multiple light-emitting unit groups.

2. The backlight source according to claim 1, characterized in that: The first electrode wiring and the second electrode wiring are in the same layer.

3. The backlight source according to claim 2, characterized in that: The backlight source further includes a connection line disposed on the base substrate, the connection line and the light emitting unit group are in the same layer, and the connection line connects the electrode wiring and the light emitting unit group.

4. The backlight source according to claim 3, characterized in that: The light emitting unit group and the electrode wiring are located in different layers, and the electrode wiring is connected to the light emitting unit group through vias and the connecting wires.

5. The backlight source according to claim 1, characterized in that: The width and length of at least two of the first electrode lines are positively correlated.

6. The backlight source according to claim 5, characterized in that: The plurality of first electrode traces connected to any column of light-emitting unit groups are arranged in ascending order of length along a specified direction, and any two adjacent first electrode traces satisfy the length formula: m*m / W n+1 +m*(m+1) / 2 / (W n +W n+1 +sp)=m*(m+1) / (2W n ); Among them, W n is the width of the shorter first electrode line among any two adjacent first electrode lines, W n+1 is the width of the longer first electrode line among any two adjacent first electrode lines, n is an integer greater than or equal to 1, and sp is the spacing between any two electrode lines on the substrate.

7. The backlight source according to claim 6, characterized in that: Any column of light-emitting unit groups is connected to Q first electrode traces, and the kth first electrode trace arranged in sequence along the specified direction satisfies the voltage drop formula: Where k≤Q; IR≤IB; Wherein, IR is the voltage drop of the kth first electrode line away from the connection end of the driving component, IB is the specified voltage drop, W k is the width of the kth first electrode wiring, Rs is the square resistance of the first electrode wiring, I m is the current value in the light-emitting unit group under the maximum grayscale of the backlight source, L is the length of each light-emitting unit group in any column of the light-emitting unit groups in the arrangement direction of the light-emitting unit groups in any column; the driving component connection end is arranged on one side of the multiple light-emitting unit groups arranged in rows and columns, and is respectively connected to multiple electrode wirings and the driving components in the backlight source, and the driving signals transmitted by the electrode wirings come from the driving components.

8. The backlight source according to claim 7, characterized in that: The specified pressure drop satisfies the formula: IB=(I m -I m-1 ) / 2; Among them, I m-1 is the current value in the light emitting unit group at the gray scale adjacent to the maximum gray scale.

9. The backlight source according to claim 5, characterized in that: The multiple first electrode traces connected to any column of the light-emitting unit group are arranged in sequence along a specified direction in ascending order of length, and among the multiple first electrode traces connected to any column of the light-emitting unit group, among two adjacent first electrode traces, the longer first electrode trace extends toward the side of the shorter first electrode trace to form an extension portion, and the orthographic projection of the extension portion on the substrate does not overlap with the orthographic projection of the shorter first electrode trace on the substrate.

10. The backlight source according to claim 5, characterized in that: The multiple first electrode lines connected to any column of light-emitting unit groups are arranged in sequence along a specified direction in ascending order of length, and among the multiple first electrode lines connected to any column of light-emitting unit groups, the longer first electrode line of two adjacent first electrode lines is L-shaped, and the shorter first electrode line is straight or L-shaped.

11. The backlight source according to any one of claims 1 to 10, characterized in that: The first electrode wiring is an anode wiring, and the second electrode wiring is a cathode wiring.

12. The backlight source according to any one of claims 1-5 or 9-10, characterized in that: The first electrode wiring is a cathode wiring, and the second electrode wiring is an anode wiring.

13. The backlight source according to any one of claims 1 to 10, characterized in that: The light emitting unit is a small light emitting diode.

14. A display device, characterized in that: The display device comprises a display panel and the backlight source according to any one of claims 1-13.

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