Wiring substrate of lamp panel, lamp panel, backlight source and display device

Abstract

The embodiment of the invention provides a wiring substrate of a lamp panel, the lamp panel, a backlight source and a display device. The wiring substrate is provided with a wiring area and a binding area; the wiring area comprises a plurality of groups of wires corresponding to the plurality of columns of LED units, and each group of wires comprises a signal feedback wire, a grounding wire and a protection wire located between the signal feedback wire and the grounding wire, wherein the signal feedback wire and the grounding wire are arranged at intervals; the binding area comprises a plurality of first pins, the plurality of first pins comprise protection wire pins, and the protection wire is connected with the protection wire pins to obtain a protection voltage signal.

Description

Technical Field

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

[0002] Mini LED (Mini Light Emitting Diode) displays use Mini LED backlight sources to provide backlight. The core component of the Mini LED backlight source is the Mini LED light board, which includes a printed circuit board (PCB), LEDs on the PCB, and an integrated circuit (IC).

[0003] PCB has a routing area and a binding area. In the routing area, the row of LEDs farthest from the binding area has an additional signal feedback line (FB) connected to it compared to other routing lines. For MiniLED light boards with this routing design, the row of LEDs farthest from the binding area is prone to uneven brightness. For example, at the weakest brightness level L0, other rows of LEDs do not emit light, but the row of LEDs farthest from the binding area has weaker brightness. Summary of the invention

[0004] The embodiment of the present disclosure provides a wiring substrate of a light board, a light board, a backlight source and a display device to solve the problem of uneven brightness. The technical solution is as follows:

[0005] In a first aspect, a wiring substrate of a light board is provided, wherein the wiring substrate has a routing area and a binding area;

[0006] The routing area includes a plurality of routing groups corresponding to a plurality of columns of light emitting diode LED units, each group of routing groups includes spaced signal feedback lines and grounding lines, and a protection line located between the signal feedback lines and the grounding lines;

[0007] The binding area includes a plurality of first pins, the plurality of first pins include a protection line pin, and the protection line is connected to the protection line pin to obtain a protection voltage signal.

[0008] Optionally, the ratio of the width of the protection line to the width of the signal feedback line is 0.9-1.2.

[0009] Optionally, the width of the protective line is 90 to 120 microns.

[0010] Optionally, a ratio of a distance between the protection line and the signal feedback line to a distance between the protection line and the ground line is 0.9 to 1.2.

[0011] Optionally, the distance between the protection line and the signal feedback line is 90 to 120 microns;

[0012] The distance between the protection line and the grounding line is 90 to 120 microns.

[0013] Optionally, the signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction; the second direction is an arrangement direction of a column of the LED units, and the first direction is perpendicular to the second direction;

[0014] The protection line is located between the second portion of the signal feedback line and the second portion of the ground line, and the distance between the first portion of the signal feedback line and the first portion of the ground line is greater than the distance between the second portion of the signal feedback line and the second portion of the ground line.

[0015] For example, a distance between the first portion of the signal feedback line and the first portion of the ground line is greater than 1000 microns.

[0016] Optionally, the signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction; the second direction is an arrangement direction of a column of the LED units, and the first direction is perpendicular to the second direction;

[0017] The guard line includes a first portion extending along a first direction and a second portion extending along a second direction, the first portion of the guard line is located between the first portion of the signal feedback line and the first portion of the ground line, and the second portion of the guard line is located between the second portion of the signal feedback line and the second portion of the ground line.

[0018] In a second aspect, a light board is provided, the light board comprising: a wiring substrate having a wiring area and a binding area, a plurality of columns of LED units located in the wiring area of ​​the wiring substrate, and a flexible circuit board FPC connected to the binding area of ​​the wiring substrate;

[0019] The routing area includes a plurality of routing groups corresponding to the plurality of columns of LED units, each group of routing groups includes spaced signal feedback lines and grounding lines, and a protection line located between the signal feedback lines and the grounding lines;

[0020] The binding area includes a plurality of first pins, the plurality of first pins include a protection line pin, the protection line is connected to the protection line pin, and the FPC is used to provide a protection voltage signal to the protection line through the protection line pin.

[0021] Optionally, the ratio of the width of the protection line to the width of the signal feedback line is 0.9-1.2.

[0022] Optionally, the width of the protective line is 90 to 120 microns.

[0023] Optionally, a ratio of a distance between the protection line and the signal feedback line to a distance between the protection line and the ground line is 0.9 to 1.2.

[0024] Optionally, the distance between the protection line and the signal feedback line is 90 to 120 microns;

[0025] The distance between the protection line and the grounding line is 90 to 120 microns.

[0026] Optionally, the signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction; the second direction is an arrangement direction of a column of the LED units, and the first direction is perpendicular to the second direction;

[0027] The protection line is located between the second portion of the signal feedback line and the second portion of the ground line, and the distance between the first portion of the signal feedback line and the first portion of the ground line is greater than the distance between the second portion of the signal feedback line and the second portion of the ground line.

[0028] For example, a distance between the first portion of the signal feedback line and the first portion of the ground line is greater than 1000 microns.

[0029] Optionally, the signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction; the second direction is an arrangement direction of a column of the LED units, and the first direction is perpendicular to the second direction;

[0030] The guard line includes a first portion extending along a first direction and a second portion extending along a second direction, the first portion of the guard line is located between the first portion of the signal feedback line and the first portion of the ground line, and the second portion of the guard line is located between the second portion of the signal feedback line and the second portion of the ground line.

[0031] Optionally, a ratio of a difference between the protection voltage signal and the voltage signal of the signal feedback line to the voltage signal of the signal feedback line is -10% to 10%.

[0032] Optionally, the protection voltage signal is equal to a voltage signal of the signal feedback line.

[0033] In a third aspect, a backlight source is provided, comprising a light board as described in any one of the second aspects and an optical lens, wherein the optical lens is located on a light emitting side of the light board.

[0034] In a fourth aspect, a display device is provided, comprising the backlight source as described in the third aspect and a display panel, wherein the display panel is located at a light emitting side of the backlight source.

[0035] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects:

[0036] In the embodiment of the present disclosure, a protective line is provided between the signal feedback line and the ground line and a protective voltage signal is applied to isolate the signal feedback line and the ground line, thereby preventing leakage between the signal feedback line and the ground line that causes abnormal brightness of a row of LEDs farthest from the binding area, thereby ensuring uniform brightness of the light board using the wiring substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 It is a structural schematic diagram of a light board provided by the related technology;

[0039] Figure 2 It is a schematic diagram of the wiring substrate structure of a light board provided by the related technology;

[0040] Figure 3 It is a schematic diagram of the structure of a wiring substrate of a light board provided in an embodiment of the present disclosure;

[0041] Figure 4 It is a schematic diagram of the structure of a wiring substrate of a light board provided in an embodiment of the present disclosure;

[0042] Figure 5 It is a structural schematic diagram of a light board provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0043] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0044] In order to facilitate understanding of the solution provided by the present disclosure, the structure of the light board in the related art is first described. Figure 1 This is a schematic diagram of the structure of a light board provided by the related technology. Figure 1 The light board includes: a wiring substrate 10, a plurality of columns of LED units 20 and a flexible printed circuit board (FPC) (not shown in the figure).

[0045] Figure 1 Only one column of LED units 20 is shown as an example. The structures of the LED units 20 in each column of the light board are the same.

[0046] The wiring substrate 10 may be a PCB, or a glass-based wiring substrate.

[0047] Among them, the LED can be Mini LED or Micro LED.

[0048] Figure 2 It is a structural schematic diagram of a wiring substrate of a light board provided by the related technology. Figure 2 Only a partial structural diagram of the wiring substrate is shown as an example. Figure 2 The wiring substrate 10 has a routing area 11 and a binding area 12 . Figure 1 The portion shown in FIG. 1 is located in the wiring area 11 of the wiring substrate.

[0049] See also Figure 1 and Figure 2 The multiple columns of LED units 20 are located in the routing area 11 of the wiring substrate 10, and the FPC is connected to the binding area 12 of the wiring substrate 10. The routing area 11 includes multiple groups of routing lines 110 corresponding to the multiple columns of LED units 20, and the binding area 12 includes multiple first pins 120. The routing lines 110 are connected to the first pins 120, so that the FPC can input signals to the routing lines 110 through the first pins 120 to control the brightness of the LED 20.

[0050] There are multiple implementation modes for the routing types included in each group of routing lines 110 . The following is an example in which each group of routing lines 110 includes an alternate signal feedback line FB and a ground line GND.

[0051] like Figure 1 and Figure 2 As shown, each group of traces 110 may include a voltage signal line VLED, an address control line ADDR, and a brightness control line PWR in addition to a signal feedback line FB and a ground line GND. The plurality of first pins 120 of the binding area 12 include a VLED pin, an ADDR pin, a PWR pin, a GND pin, and a FB pin, which are respectively connected to the voltage signal line VLED, the address control line ADDR, the brightness control line PWR, the ground line GND, and the signal feedback line FB.

[0052] See again Figure 2 The wiring substrate 10 further includes a fan-out area 13 located between the routing area 11 and the binding area 12 , in which a lead 150 is arranged. The lead 150 is used to connect the signal line in the routing area 11 and the pin in the binding area 12 .

[0053] like Figure 1 As shown, each column of LED units 20 corresponds to a plurality of light areas 21 arranged along the second direction Y in the wiring area 11, and at least one LED 22 is disposed in each light area 21, for example Figure 1 In one embodiment, four LEDs 22 are arranged in each light zone 21, or, in other embodiments, six LEDs 22 are arranged in each light zone 21. When arranging a plurality of LEDs 22, the plurality of LEDs 22 may be arranged in a row (e.g. Figure 1 As shown), multiple LEDs 22 may also be arranged in multiple rows.

[0054] An integrated circuit (IC) unit 23 is also disposed in each light zone 21 . Each IC unit 23 controls one light zone. The IC unit 23 is used to obtain a signal from the wiring 110 , and control the brightness of the LED 22 in the light zone 21 based on the signal provided by the wiring 110 .

[0055] In other implementations, each lamp area 21 may also be designed with more IC units 23, which is not limited.

[0056] For example, the lamp area 21 includes N LEDs 22, where N is an integer greater than 1. The N LEDs 22 are connected in series, that is, the N electrode of the first LED 22 is connected to the P electrode of the second LED 22, the N electrode of the second LED 22 is connected to the P electrode of the third LED 22, and so on, the N electrode of the N-1th LED 22 is connected to the P electrode of the Nth LED 22.

[0057] The P electrode of the first LED 22 is connected to the voltage signal line VLED, and the N electrode of the Nth LED 22 in the row of light zones 21 (light zones arranged in rows and columns) farthest from the binding zone 12 is connected to the signal feedback line FB. The function of the signal feedback line FB is to detect whether the LED voltage signal is normal, so only the LEDs 22 in the row of light zones 21 farthest from the binding zone 12 need to be connected.

[0058] Among them, a row of light areas 21 farthest from the binding area 12 can also be called the sky side of the light board.

[0059] The IC unit 23 includes 4 pins, namely, an OUT pin connected to the N electrode of the Nth LED 22 in the lamp area 21, a GND pin connected to the ground line GND, a PWR pin connected to the brightness control line PWR, and a DI pin. The DI pin of the IC unit 23 in the lamp area 21 in the row closest to the binding area 12 is connected to the address control line ADDR, and each IC unit 23 in the same column of lamp areas 21 is cascaded by connecting the DI pins and OUT pins of two adjacent IC units.

[0060] See again Figure 2 The wiring area 11 of the wiring substrate 10 also includes a second pin 130 connected to the LED. The second pin 130 includes an N pin and a P pin. The N pin and the P pin are used to connect to the N electrode and the P electrode of the LED respectively. The N pin and the P pin connected to the same LED are regarded as a group of second pins 130. Then, each lamp area 21 includes N groups of second pins 130. These N groups of second pins 130 are connected in series, that is, the N pin of the first group of second pins is connected to the P pin of the second group of second pins, the N pin of the second group of second pins is connected to the P pin of the third group of second pins, and so on. The N pin of the N-1th group of second pins is connected to the P pin of the Nth group of second pins.

[0061] See again Figure 2 The wiring area 11 of the wiring substrate 10 also includes third pins 140 connected to the IC unit, namely, the OUT, GND, DI and PWR pins in the figure, which are respectively used to connect to the four pins (OUT pin, GND pin, PWR pin, DI pin) of the IC unit. The four pins connected to the same IC unit are regarded as a group of third pins, and the wiring area 11 includes multiple groups of third pins 140.

[0062] exist Figure 1 The corresponding part describes the connection relationship between the IC unit and the LED and the wiring. In fact, these connection relationships are realized by connecting the wiring and the pins in the wiring substrate.

[0063] See also Figure 2 The P pin of the first group of second pins 130 in each lamp area 21 is connected to the voltage signal line VLED, and the N pin of the Nth group of second pins 130 in the row of lamp areas 21 farthest from the binding area 12 is connected to the signal feedback line FB.

[0064] In a group of third pins 140, the OUT pin is connected to the N pin in the Nth group of second pins 130 in the lamp area 21, the GND pin is connected to the ground line GND, and the PWR pin is connected to the brightness control line PWR. The DI pin in the third pins 140 in the row of lamp areas 21 closest to the binding area 12 is connected to the address control line ADDR, and multiple groups of third pins 140 in the same column are cascaded by connecting the DI pins and OUT pins of two adjacent groups of third pins 140.

[0065] In the above-mentioned light board, the light area in the column is selected by the signal provided by the address control line ADDR, the OUT pin and GND pin in the IC unit in the corresponding light area are connected, and the brightness of the LED in the light area is controlled by the signal provided by the brightness control line PWR.

[0066] In the row of lamp areas 21 farthest from the binding area 12 , since the OUT pin and the signal feedback line FB are both connected to the N electrode of the Nth LED 22 , the OUT pin and the signal feedback line FB in the row of lamp areas 21 farthest from the binding area 12 are connected.

[0067] See again Figure 1 When the LEDs in the row of light zones 21 farthest from the binding zone 12 are controlled not to emit light (corresponding to the L0 grayscale), since the voltage of the signal feedback line FB is usually 2-3V, which is much higher than the voltage of the ground line GND, there is a potential difference between the signal feedback line FB and the ground line GND, resulting in leakage between the signal feedback line FB and the ground line GND ( Figure 1 As shown by the dotted arrow in the middle, since the ground wire GND is connected to the GND pin, the leakage is equivalent to the GND pin and the OUT pin being connected, causing abnormal light emission. When controlling the LEDs in the row of light areas 21 farthest from the binding area 12 to emit light (corresponding to other grayscales), leakage to the signal feedback line FB may occur, causing abnormal brightness.

[0068] In order to solve the problems existing in the light board in the related art, the present disclosure improves the wiring substrate and the light board in the light board, and the following is a detailed description of the scheme in conjunction with the accompanying drawings:

[0069] Figure 3 Schematic diagram of the structure of a wiring substrate of a light board provided by an embodiment of the present disclosure. Figure 3 The wiring substrate 10 has a routing area 11 and a binding area 12 .

[0070] The wiring area 11 includes a plurality of wiring groups 110 corresponding to a plurality of columns of LED units. Each wiring group 110 includes a signal feedback line FB and a ground line GND spaced apart, and a guard line GRD (Guard) located between the signal feedback line FB and the ground line GND.

[0071] exist Figure 3 In the structure shown, multiple columns of LED units correspond to multiple groups of wires 110 one-to-one, that is, each column of LED units is connected to one group of wires 110. In other implementations, multiple columns of LED units may not correspond to multiple groups of wires 110 one-to-one, for example, one-to-many or many-to-one.

[0072] The binding area 12 includes a plurality of first pins 120 , and the plurality of first pins 120 include a protection line pin GRD, and the protection line GRD is connected with the protection line pin GRD to obtain a protection voltage signal.

[0073] In the embodiment of the present disclosure, a protective line is provided between the signal feedback line and the ground line and a protective voltage signal is applied to isolate the signal feedback line and the ground line, thereby preventing leakage between the signal feedback line and the ground line that causes abnormal brightness of a row of LEDs farthest from the binding area, thereby ensuring uniform brightness of the light board using the wiring substrate.

[0074] By improving the brightness uniformity of the light board, the product yield can be improved and the cost can be reduced.

[0075] In addition, although there is an electric potential difference between the protective line and the ground line, the difference between the protective line and the signal feedback line is that the protective line is not connected to the OUT pin in the row of light areas 21 farthest from the binding area 12, so it will not cause the GND pin and the OUT pin in the row of light areas 21 farthest from the binding area 12 to be connected, and will not cause abnormal LED brightness.

[0076] In the disclosed embodiment, each pin 120 of the binding area 12 is bound to a corresponding pin of the FPC and connected to a control unit, such as a micro controller unit (MCU), through the FPC.

[0077] In the disclosed embodiment, Figure 3 The pin and lead design can be Figure 2 The same, no further elaboration is given here.

[0078] In some possible implementations, the pins (120, 130, 140) and traces (110, 1150) in the wiring substrate 10 of the light board are all located on the same layer, that is, made of the same layer of metal.

[0079] In some other possible implementations, the pins and traces in the wiring substrate 10 of the light board may also be located in different layers, for example, in two or more layers of metal.

[0080] In an implementation of the present disclosure, the ratio of the width of the protection line to the width of the signal feedback line is 0.9 to 1.2.

[0081] Exemplarily, the width of the signal feedback line FB is 90-120 micrometers, and the width of the guard line GRD is 90-120 micrometers.

[0082] The above-mentioned width is adopted as the width of the guard line, so that the width of the guard line is close to the width of the signal feedback line, so that when the guard voltage signal provided to the guard line is close to the signal provided by the N pin of the second pin of the Nth group in the farthest row of light zones 21, the voltage of the guard line is close to the voltage of the signal feedback line. In this way, there is no potential difference or the potential difference is very small between the guard line and the signal feedback line, and there will be no leakage current between the guard line and the signal feedback line, thereby avoiding leakage current between the signal feedback line and the ground line, and avoiding abnormal brightness of the LEDs in the farthest row of light zones 21.

[0083] In some possible implementations, the width of the guard line GRD remains unchanged, that is, the width at any position is a fixed value. For example, the width of the guard line GRD is constant at 100 microns, and the width of the signal feedback line FB is 100 microns.

[0084] In some other possible implementations, the width of the guard line GRD is variable, but the range of variation is within the aforementioned 90 to 120 microns.

[0085] In an implementation of the present disclosure, the ratio of the distance between the protection line and the signal feedback line to the distance between the protection line and the ground line is 0.9 to 1.2.

[0086] Exemplarily, the distance between the guard line GRD and the signal feedback line FB is 90 to 120 micrometers; the distance between the guard line GRD and the ground line is 90 to 120 micrometers.

[0087] By arranging the guard line within the above spacing range, on the one hand, short circuit will not occur due to the guard line being too close to the signal feedback line / ground line; on the other hand, too much wiring substrate area will not be occupied due to the guard line being too far from the signal feedback line / ground line.

[0088] In some possible implementations, the distance between the protection line GRD and the signal feedback line FB is the same as the distance between the protection line GRD and the ground line GND.

[0089] In some other possible implementations, the distance between the guard line GRD and the signal feedback line FB is different from the distance between the guard line GRD and the ground line GND.

[0090] In some possible implementations, the distance between the guard line GRD and the signal feedback line FB / ground line GND remains unchanged, that is, the distance at any position is a fixed value, for example, the distance between the guard line GRD and the signal feedback line FB / ground line GND is constant at 100 microns.

[0091] In some other possible implementations, the distance between the guard line GRD and the signal feedback line FB / ground line GND can be variable, but the range of variation is within the aforementioned 90-120 microns.

[0092] See again Figure 3 The signal feedback line FB and the ground line GND each include a first portion extending along a first direction X and a second portion extending along a second direction Y. The second direction is the arrangement direction of a column of LED units, the first direction is perpendicular to the second direction, that is, the first direction is the row direction, and the second direction is the column direction.

[0093] Since a larger spacing can be set between the signal lines in the Y direction of the light board, that is, the spacing between the first part of the signal feedback line FB and the first part of the ground line GND can be larger, illustratively, the spacing between the first part of the signal feedback line and the first part of the ground line is greater than the spacing between the second part of the signal feedback line and the second part of the ground line, for example, the spacing between the first part of the signal feedback line FB and the first part of the ground line GND is greater than 1000 microns (the spacing size is not shown in the figure). At this time, no protective line may be set between the first part of the signal feedback line FB and the first part of the ground line GND, and leakage is avoided by relying on the spacing between the two.

[0094] In the Y direction of the light board, the spacing between the signal lines is smaller, that is, the spacing between the second part of the signal feedback line FB and the second part of the ground line GND is smaller. At this time, a protective line GRD needs to be set between the second part of the signal feedback line FB and the second part of the ground line GND. The protective line GRD is located between the second part of the signal feedback line FB and the second part of the ground line GND.

[0095] In this implementation, a guard line GRD is arranged between the second portion of the signal feedback line FB and the second portion of the ground line GND. The guard line GRD is arranged with a short length, which is convenient for design and manufacture.

[0096] Figure 4 It is a structural schematic diagram of a wiring substrate of a light board provided in an embodiment of the present disclosure. Figure 4 Wiring substrate and Figure 3 The main difference lies in the design of the protection line GRD. Figure 4 In the embodiment, the guard line GRD includes a first portion extending along a first direction and a second portion extending along a second direction, the first portion of the guard line GRD is located between the first portion of the signal feedback line FB and the first portion of the ground line GND, and the second portion of the guard line GRD is located between the second portion of the signal feedback line FB and the second portion of the ground line GND.

[0097] In this implementation, a guard line GRD is set between the second part of the signal feedback line FB and the second part of the ground line GND, and a guard line GRD is also set between the first part of the signal feedback line FB and the first part of the ground line GND. The distance between the first part of the signal feedback line and the first part of the ground line can be set to be smaller, so that the lamp board structure is more compact.

[0098] Figure 5 Schematic diagram of the structure of a light board provided by an embodiment of the present disclosure. Figure 5 The light board includes: a wiring substrate 10, a plurality of LED units 20 and a flexible circuit board FPC (not shown in the figure). The structure of the wiring substrate 10 can be seen in Figure 3 or Figure 4 .

[0099] The wiring substrate 10 has a wiring area 11 and a binding area 12 , a plurality of columns of LED units 20 are located in the wiring area 11 of the wiring substrate 10 , and the FPC is connected to the binding area 12 of the wiring substrate 10 .

[0100] The wiring area 11 includes a plurality of wiring groups 110 corresponding to a plurality of columns of LED units. Each wiring group 110 includes a signal feedback line FB and a ground line GND spaced apart, and a guard line GRD located between the signal feedback line FB and the ground line GND.

[0101] The binding area 12 includes a plurality of first pins 120 , and the plurality of first pins 120 include a guard line pin GRD, the guard line GRD is connected to the guard line pin GRD, and the FPC is used to provide a guard voltage signal to the guard line GRD through the guard line pin GRD.

[0102] In the embodiment of the present disclosure, a protective line is provided between the signal feedback line and the ground line and a protective voltage signal is applied to isolate the signal feedback line and the ground line, thereby preventing leakage between the signal feedback line and the ground line that causes abnormal brightness of a row of LEDs farthest from the binding area, thereby ensuring uniform brightness of the light board using the wiring substrate.

[0103] In an implementation of the present disclosure, the ratio of the width of the protection line to the width of the signal feedback line is 0.9 to 1.2.

[0104] Exemplarily, the width of the signal feedback line is 90 to 120 microns, and the width of the protection line is 90 to 120 microns.

[0105] The above-mentioned width is adopted as the width of the guard line, so that the width of the guard line is close to the width of the signal feedback line, so that when the guard voltage signal provided to the guard line is close to the signal provided by the N pin of the second pin of the Nth group in the farthest row of light zones 21, the voltage of the guard line is close to the voltage of the signal feedback line. In this way, there is no potential difference or the potential difference is very small between the guard line and the signal feedback line, and there will be no leakage current between the guard line and the signal feedback line, thereby avoiding leakage current between the signal feedback line and the ground line, and avoiding abnormal brightness of the LEDs in the farthest row of light zones 21.

[0106] In an implementation of the present disclosure, the ratio of the distance between the protection line and the signal feedback line to the distance between the protection line and the ground line is 0.9 to 1.2.

[0107] Exemplarily, the distance between the guard line and the signal feedback line is 90 to 120 microns; the distance between the guard line and the ground line is 90 to 120 microns.

[0108] By arranging the guard line within the above spacing range, on the one hand, short circuit will not occur due to the guard line being too close to the signal feedback line / ground line; on the other hand, too much wiring substrate area will not be occupied due to the guard line being too far from the signal feedback line / ground line.

[0109] In some possible implementations, the signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction;

[0110] The protection line is located between the second portion of the signal feedback line and the second portion of the ground line, and the distance between the first portion of the signal feedback line and the first portion of the ground line is greater than the distance between the second portion of the signal feedback line and the second portion of the ground line.

[0111] For example, a distance between the first portion of the signal feedback line and the first portion of the ground line is greater than 1000 microns.

[0112] In some other possible implementations, the signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction;

[0113] The guard line includes a first portion extending along a first direction and a second portion extending along a second direction, the first portion of the guard line is located between the first portion of the signal feedback line and the first portion of the ground line, and the second portion of the guard line is located between the second portion of the signal feedback line and the second portion of the ground line.

[0114] In the embodiment of the present disclosure, the ratio of the difference between the protection voltage signal and the voltage signal of the signal feedback line to the voltage signal of the signal feedback line is -10% to 10%.

[0115] For example, if the voltage of the voltage signal of the signal feedback line is 2 to 3V, then the voltage of the protection voltage signal is 1.8 to 3.3V.

[0116] In this implementation, the protection voltage signal is set to be close to the voltage signal of the signal feedback line, so that the potential difference between the protection voltage signal and the signal feedback line is small enough to avoid leakage and ensure the protection effect.

[0117] In one example, the protection voltage signal is equal to a voltage signal of the signal feedback line.

[0118] For example, the MCU obtains the voltage signal fed back by the signal feedback line, and then writes a protection voltage signal having the same voltage as the voltage signal fed back by the obtained signal feedback line into the protection line.

[0119] In this implementation, the most ideal protection effect is obtained by setting the protection voltage signal to be equal to the voltage signal of the signal feedback line.

[0120] The present disclosure also provides a backlight source, which includes: Figure 5 Light board shown.

[0121] Optionally, the backlight source includes, in addition to the light board, an optical lens, and the optical lens is arranged on the light emitting side of the light board.

[0122] The light panel provided in the embodiment of the present disclosure can be used not only in backlight sources but also in other applications, such as lighting.

[0123] The embodiment of the present disclosure further provides a display device, wherein the display panel includes the backlight source as described above.

[0124] The display device also includes a display panel, which is arranged on the light-emitting side of the backlight source.

[0125] The display device in the embodiments of the present disclosure may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or the like.

[0126] The above description is only an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A wiring substrate for a light panel, characterized in that: The wiring substrate has a routing area and a binding area; The routing area includes a plurality of routing groups corresponding to a plurality of columns of light emitting diode LED units, each group of routing groups includes a signal feedback line and a ground line spaced apart, and a protection line located between the signal feedback line and the ground line; The binding area includes a plurality of first pins, the plurality of first pins include a protection line pin, and the protection line is connected to the protection line pin to obtain a protection voltage signal.

2. The wiring substrate according to claim 1, wherein: The ratio of the width of the protection line to the width of the signal feedback line is 0.9 to 1.

2.

3. The wiring substrate according to claim 2, wherein: The width of the protection line is 90 to 120 microns.

4. The wiring substrate according to any one of claims 1 to 3, characterized in that: The ratio of the distance between the protection line and the signal feedback line to the distance between the protection line and the ground line is 0.9 to 1.

2.

5. The wiring substrate according to claim 4, characterized in that The distance between the protection line and the signal feedback line is 90 to 120 microns; The distance between the protection line and the grounding line is 90 to 120 microns.

6. The wiring substrate according to any one of claims 1 to 3 and 5, characterized in that: The signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction; the second direction is an arrangement direction of a row of the LED units, and the first direction is perpendicular to the second direction; The protection line is located between the second portion of the signal feedback line and the second portion of the ground line, and the distance between the first portion of the signal feedback line and the first portion of the ground line is greater than the distance between the second portion of the signal feedback line and the second portion of the ground line.

7. The wiring substrate according to any one of claims 1 to 3 and 5, characterized in that: The signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction; the second direction is an arrangement direction of a row of the LED units, and the first direction is perpendicular to the second direction; The guard line includes a first portion extending along a first direction and a second portion extending along a second direction, the first portion of the guard line is located between the first portion of the signal feedback line and the first portion of the ground line, and the second portion of the guard line is located between the second portion of the signal feedback line and the second portion of the ground line.

8. A light board, characterized in that: The light board comprises: a wiring substrate having a wiring area and a binding area, a plurality of columns of light emitting diodes (LED) units located in the wiring area of ​​the wiring substrate, and a flexible circuit board (FPC) connected to the binding area of ​​the wiring substrate; The routing area includes a plurality of routing groups corresponding to the plurality of columns of LED units, each group of routing groups includes spaced signal feedback lines and grounding lines, and a protection line located between the signal feedback lines and the grounding lines; The binding area includes a plurality of first pins, the plurality of first pins include a protection line pin, the protection line is connected to the protection line pin, and the FPC is used to provide a protection voltage signal to the protection line through the protection line pin.

9. The light board according to claim 8, characterized in that: The ratio of the width of the protection line to the width of the signal feedback line is 0.9 to 1.

2.

10. The light board according to claim 8 or 9, characterized in that: The signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction; the second direction is an arrangement direction of a row of the LED units, and the first direction is perpendicular to the second direction; The protection line is located between the second portion of the signal feedback line and the second portion of the ground line, and the distance between the first portion of the signal feedback line and the first portion of the ground line is greater than the distance between the second portion of the signal feedback line and the second portion of the ground line.

11. The light board according to claim 8 or 9, characterized in that: The signal feedback line and the ground line each include a first portion extending along a first direction and a second portion extending along a second direction; the second direction is an arrangement direction of a row of the LED units, and the first direction is perpendicular to the second direction; The guard line includes a first portion extending along a first direction and a second portion extending along a second direction, the first portion of the guard line is located between the first portion of the signal feedback line and the first portion of the ground line, and the second portion of the guard line is located between the second portion of the signal feedback line and the second portion of the ground line.

12. The light board according to claim 8 or 9, characterized in that: The ratio of the difference between the protection voltage signal and the voltage signal of the signal feedback line to the voltage signal of the signal feedback line is -10% to 10%.

13. The light panel according to claim 12, characterized in that: The protection voltage signal is equal to the voltage signal of the signal feedback line.

14. A backlight source, characterized in that: The backlight source comprises a light board as described in any one of claims 8 to 13 and an optical lens, and the optical lens is located on the light emitting side of the light board.

15. A display device, characterized in that: The display device comprises the backlight source as claimed in claim 14 and a display panel, wherein the display panel is located at the light emitting side of the backlight source.

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