Substrate unit, substrate splicing structure, backlight module and display device

Abstract

The present invention provides a substrate unit, a substrate splicing structure, a backlight module and a display device. The substrate unit includes a printed circuit board, an LED light array arranged on the same side of the printed circuit board, an edge photoresistor, a surface photoresistor and a control unit. The LED light array includes a first LED light group and a second LED light group, and the second LED light group is arranged at least partially around the outer side of the first LED light group; the edge photoresistor is arranged outside the second LED light group, and the surface photoresistor is arranged inside the first LED light group; the control unit is electrically connected to the edge photoresistor, the surface photoresistor, the first LED light group and the second LED light group respectively, and the control unit is used to receive the current passing through the edge photoresistor and the current passing through the surface photoresistor respectively, and after being modulated by the control unit, the current difference transmitted to the first LED light group and the second LED light group is less than a preset value. The substrate unit has the advantage of being able to make the substrate unit, the substrate splicing structure made by the substrate unit and the backlight module have uniform brightness.

Description

Technical Field

[0001] The present invention relates to the technical field of backlight modules, and in particular to a substrate unit, a substrate splicing structure, a backlight module and a display device. Background Art

[0002] In existing substrate units, photoresistors and LED lights are usually integrated on a printed circuit board at the same time. When voltage is applied, the brightness of the LED lights at the edge is lower than that of the LED lights in the middle, resulting in uneven brightness. In this way, when multiple substrate units are spliced ​​and applied to the light-emitting module, the brightness of the backlight module will also be uneven.

[0003] In view of this, it is necessary to provide a new substrate unit, a substrate splicing structure, a backlight module and a display device to solve or at least alleviate the above technical defects. Summary of the invention

[0004] The main purpose of the present invention is to provide a substrate unit, a substrate splicing structure, a backlight module and a display device, aiming to solve the technical problem of uneven light brightness of the substrate unit in the prior art.

[0005] To achieve the above object, according to one aspect of the present invention, the present invention provides a substrate unit, comprising:

[0006] Printed circuit boards;

[0007] An LED lamp array, the LED lamp array comprising a first LED lamp group and a second LED lamp group, wherein the second LED lamp group is at least partially arranged around an outer side of the first LED lamp group;

[0008] A side photoresistor, wherein the side photoresistor is arranged on a side of the second LED light group away from the first LED light group;

[0009] A surface photoresistor, wherein the LED lamp array, the edge photoresistor and the surface photoresistor are arranged on the same side of the printed circuit board, and the surface photoresistor is arranged in the first LED lamp group;

[0010] A control unit, wherein the control unit is electrically connected to the edge photoresistor, the surface photoresistor, the first LED light group and the second LED light group respectively, and the control unit is used to receive the current passing through the edge photoresistor and the current passing through the surface photoresistor respectively, and after modulation by the control unit, the current difference transmitted to the first LED light group and the second LED light group is made smaller than a preset value.

[0011] In one embodiment, the second LED light group is arranged in a circle around the outer circumference of the first LED light group.

[0012] In one embodiment, the first LED light group is square;

[0013] The second LED light group is arranged around two adjacent sides of the first LED light group, or the second LED light group is arranged around three sides of the first LED light group.

[0014] In one embodiment, there are multiple side photoresistors, and the multiple side photoresistors are distributed at intervals along the arrangement direction of the second LED lamp group.

[0015] In one embodiment, the first LED lamp group includes a plurality of LED lamps arranged at intervals, and at least one of the planar photoresistors is arranged in the gaps between the plurality of LED lamps.

[0016] According to another aspect of the present invention, the present invention further provides a substrate splicing structure, comprising a plurality of substrate units as described above, wherein the plurality of substrate units are spliced ​​together to form a plurality of splicing seams, and the second LED lamp group is arranged close to the adjacent splicing seams.

[0017] According to yet another aspect of the present invention, the present invention further provides a backlight module, comprising a back panel and the substrate splicing structure as claimed in claim 7 arranged on the back panel.

[0018] In one embodiment, a reflective member is disposed on the back panel, and the reflective member is disposed on the side of the back panel facing the substrate splicing structure. There are multiple reflective members, and at least one reflective member is disposed at the splicing point of each two adjacent substrate units.

[0019] In one embodiment, the reflective element is a protruding structure formed on the back plate, and the outer surface of the protruding structure is coated with a reflective layer.

[0020] According to yet another aspect of the present invention, the present invention further provides a display device, comprising a display panel and the backlight module as described above, wherein the backlight module is used to provide backlight for the display panel.

[0021] In the above scheme, the substrate unit includes a printed circuit board, an LED lamp array, an edge photoresistor, a surface photoresistor and a control unit arranged on the same side of the printed circuit board, the LED lamp array includes a first LED lamp group and a second LED lamp group, the second LED lamp group is at least partially arranged around the first LED lamp group on a side away from the first LED lamp group; the edge photoresistor is arranged outside the second LED light group, and the surface photoresistor is arranged inside the first LED light group; the control unit is electrically connected to the edge photoresistor, the surface photoresistor, the first LED lamp group and the second LED light group, respectively, and the control unit is used to receive the current passing through the edge photoresistor and the current passing through the surface photoresistor, respectively, and after modulation by the control unit, the current difference transmitted to the first LED lamp group and the second LED lamp group is less than a preset value. The invention adds a control unit. After receiving the current from the edge photoresistor and the surface photoresistor, the control unit can modulate the current so that the difference in current output to the first LED light group and the second LED light group after modulation by the control unit is reduced to less than a preset value. The current size determines the brightness of the LED light group. When the difference in current between the first LED light group and the second LED light group is small, it can ensure that the brightness of the first LED light group and the second LED light group is not much different, ensuring the uniform brightness of the substrate unit. The brightness of the backlight module made of the substrate unit with uniform brightness can also be guaranteed to be uniform. The invention has the advantage of being able to make the brightness of the substrate unit, the substrate splicing structure made of the substrate unit, and the backlight module uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 is a structural schematic diagram of a substrate unit according to an embodiment of the present invention;

[0024] Figure 2 is another structural schematic diagram of a substrate unit according to an embodiment of the present invention;

[0025] Figure 3 is another structural schematic diagram of a substrate unit according to an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the circuit structure of the substrate unit according to an embodiment of the present invention;

[0027] Figure 5 It is a structural schematic diagram of a substrate splicing structure according to an embodiment of the present invention;

[0028] Figure 6 A structural schematic diagram of a backlight module according to an embodiment of the present invention from one viewing angle;

[0029] Figure 7 A schematic structural diagram of a backlight module from another viewing angle according to an embodiment of the present invention;

[0030] Figure 8 FIG. 4 is another structural schematic diagram of a backlight module according to an embodiment of the present invention.

[0031] Description of labels:

[0032] 10. Substrate unit; 20. Substrate splicing structure; 30. Backlight module; 1. Printed circuit board; 2. LED lamp array; 21. First LED lamp group; 22. Second LED lamp group; 3. Edge photoresistor; 4. Surface photoresistor; 5. Control unit; 6. Back panel; 7. Reflector.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0037] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Reference Figure 1 to Figure 4According to one aspect of the present invention, the present invention provides a substrate unit 10, comprising:

[0039] Printed circuit board 1:

[0040] An LED lamp array 2, the LED lamp array 2 comprising a first LED lamp group 21 and a second LED lamp group 22, wherein the second LED lamp group 22 is at least partially arranged around the outer side of the first LED lamp group 21;

[0041] The edge photoresistor 3 and the surface photoresistor 4, the LED lamp array 2, the edge photoresistor 3 and the surface photoresistor 4 are arranged on the same side of the printed circuit board 1, the edge photoresistor 3 is arranged on the side of the second LED lamp group 22 away from the first LED lamp group 21, and the surface photoresistor 4 is arranged in the first LED lamp group 21;

[0042] The control unit 5 is electrically connected to the edge photoresistor 3, the surface photoresistor 4, the first LED light group 21 and the second LED light group 22 respectively. The control unit 5 is used to receive the current passing through the edge photoresistor 3 and the current passing through the surface photoresistor 4 respectively, and after modulation by the control unit 5, the current difference transmitted to the first LED light group 21 and the second LED light group 22 is less than a preset value.

[0043] The LED lamp array 2 and the photoresistor are both integrated on the printed circuit board 1. The second LED lamp group 22 at the edge of the printed circuit board 1 is designed as a separate power supply line and is electrically connected to the edge photoresistor 3 at the edge of the printed circuit board 1; the first LED lamp group 21 at the middle position of the printed circuit board 1 is designed as another separate power supply line and is electrically connected to the surface photoresistor 4 at the middle position of the printed circuit board 1. Due to the characteristics of photoresistors, the resistance of photoresistors decreases as the light intensity increases. Therefore, the current passing through the photoresistors is different when the voltage is the same. Those skilled in the art can understand that the light intensity at the edge photoresistor 3 is less than the light intensity at the surface photoresistor 4 located in the middle. Therefore, the resistance of the edge photoresistor 3 is greater than the resistance of the surface photoresistor 4 located in the middle. In this way, the current flowing through the second LED light group 22 will be less than the current flowing through the first LED light group 21, which makes the brightness of the second LED light group 22 at the edge less than the brightness of the first LED light group 21 in the middle, resulting in uneven brightness. When multiple substrate units 10 are spliced ​​and applied to the substrate splicing structure 20 and the backlight module 30, the brightness of the backlight module 30 will also be uneven. This embodiment adds a control unit 5. After receiving the current of the edge photoresistor 3 and the surface photoresistor 4, the control unit 5 can modulate the current so that the difference in current output to the first LED light group 21 and the second LED light group 22 after modulation by the control unit 5 is reduced to less than a preset value. The current size determines the brightness of the LED light group. When the difference in current between the first LED light group 21 and the second LED light group 22 is small, it can be ensured that the brightness of the first LED light group 21 and the second LED light group 22 is not much different, and the brightness of the substrate unit 10 is ensured to be uniform. The brightness of the substrate splicing structure 20 and the backlight module 30 made of the substrate unit 10 with uniform brightness can also be guaranteed to be uniform, and the adjustment through the photoresistor is more accurate. This embodiment has the advantage of being able to make the brightness of the substrate unit 10 and the substrate splicing structure 20 and the backlight module 30 made of the substrate unit 10 uniform. Of course, it can also make the brightness of the display panel and the display device made of the backlight module 30 uniform. The above-mentioned substrate splicing structure 20 can be a mini LED substrate. Specifically, the control unit 5 may be an MCU chip (MCU English full name: Microcontroller Unit, Chinese name: microcontroller, commonly known as single chip microcomputer).

[0044] Reference Figure 4, specifically, define the current flowing through the edge photoresistor 3 as I_edge and the current flowing through the surface photoresistor 4 as I_surface. Since the resistance value of the edge photoresistor 3 is relatively large, I_edge < I_surface, resulting in the brightness of the second LED light group 22 at the edge of the substrate unit 10 being less than the brightness of the first LED light group 21 at the middle position of the substrate unit 10. By adding an MEU chip, it plays a modulating role in I_edge and I_surface flowing into the MEU chip respectively, and outputs the current I1 flowing through the first LED light group 21 and the current I2 flowing through the second LED light group 22 respectively. Among them, I1 > I_edge, I2 < I_surface, from which it can be obtained that I2 - I1 < I_surface - I_edge, that is, the modulation by the MCU reduces the current difference between the first LED light group 21 and the second LED light group 22, making the luminous intensities of the first LED light group 21 and the second LED light group 22 not differ much, ensuring the uniform brightness of the substrate unit 10. In another more preferred embodiment, the current intensities flowing through the first LED light group 21 and the second LED light group 22 can be set to be the same, so that the luminous brightness of the entire substrate unit 10 is the same. The control unit 5 such as an MCU chip that can modulate the current magnitude belongs to the prior art and can purchase the corresponding chip on the market, which is not the main inventive point of this application.

[0045] It should be noted that referring to Figure 5 , the sides of the substrate unit 10 are spliced together to form a substrate splicing structure 20 on the same plane. Using the above embodiments of the present invention can prevent the light brightness at the splicing seam of the substrate unit 10 from being too small. Specifically, according to the actual situation, there are the following three situations for the relative distribution of the second LED light group 22 and the first LED light group 21. Taking the LED light array 2 being square as an example for illustration:

[0046] First, please refer to Figure 3 , the substrate unit 10 is located at the middle position of the substrate splicing structure 20. At this time, the four sides of the substrate unit 10 are spliced with other substrate units 10, and there are splicing seams on all four sides. Therefore, the outer second LED light group 22 is arranged in a circle around the outer periphery of the first LED light group 21. If the first LED light group 21 forms a square, then the second LED light group 22 is a square frame formed around the square for one week, so as to ensure uniform light intensity at the splicing parts around the substrate unit 10. Of course, if the first LED light group 21 forms other circular structures, at this time the second LED light group 22 is a closed ring around the outer periphery of the first LED light group 21.

[0047] Refer to Figure 2In the second type, the first LED light group 21 is square, and the substrate unit 10 is located on a side of the substrate splicing structure 20 but not on the vertex. At this time, the three sides of the substrate unit 10 are spliced ​​with other substrate units 10, and there are splicing seams on the three sides. Therefore, the outer second LED light group 22 is arranged around the three sides of the first LED light group 21, so as to ensure that the light intensity at the splicing of the three sides of the substrate unit 10 is uniform.

[0048] Reference Figure 1 and Figure 5 In the third type, the first LED light group 21 is square, and the substrate unit 10 is located at the four vertices of the substrate splicing structure 20. At this time, only two sides of the substrate unit 10 are spliced ​​with other substrate units 10, and only two sides have splicing seams. Therefore, the outer second LED light group 22 is arranged around the two adjacent sides of the first LED light group 21, so as to ensure that the light intensity at the splicing of the two sides of the substrate unit 10 is uniform.

[0049] In one embodiment, there are multiple side photoresistors 3, and the multiple side photoresistors 3 are spaced apart along the arrangement direction of the second LED light group 22. The side photoresistors 3 are arranged on the side of the second LED light group 22 away from the first LED light group 21, and are used to make corresponding resistance changes according to the light intensity of the second LED light group 22, thereby affecting the current. Because there are multiple LED lights in the second LED light group 22, by setting multiple side photoresistors 3, the current can be adjusted more comprehensively and sensitively through the change of its own resistance.

[0050] Of course, there can be more than one photoresistor 4. The first LED lamp group 21 includes a plurality of LED lamps arranged at intervals, and at least one photoresistor 4 is arranged in the gaps between the LED lamps in the first LED lamp group 21, that is, located on the side of the second LED lamp group 22 close to the first LED lamp group 21, and is used to change the magnitude of the current through the change of its own resistance according to the light intensity of the first LED lamp group 21.

[0051] Reference Figure 5 According to another aspect of the present invention, the present invention further provides a substrate splicing structure 20, the substrate splicing structure 20 includes a plurality of the above-mentioned substrate units 10, the plurality of substrate units 10 are spliced ​​together to form a plurality of splicing seams, the second LED light group 22 is arranged close to the adjacent splicing seams, and the side photoresistor is also designed close to the splicing. The substrate splicing structure 20 is formed by splicing a plurality of substrate units 10 horizontally or vertically, two substrate units 10 form a splicing seam, and the second LED light group 33 is arranged close to the splicing seam relative to the first LED light group 21. Those skilled in the art will understand that Figure 5The schematic diagram shows a case where the number of substrate units 10 is 4. The number of substrate units 10 can also be other numbers, such as 9 and 16. The shape of the substrate splicing structure 20 can be square, circular or other shapes. Since the substrate splicing structure 20 includes all implementation methods of all technical solutions of the above-mentioned substrate unit 10, it has at least all the beneficial effects brought by all the above-mentioned implementation methods, which will not be described one by one here.

[0052] Reference Figure 6 to Figure 8 According to another aspect of the present invention, the present invention also provides a backlight module 30, including a back plate 6 and the above-mentioned substrate splicing structure 20 arranged on the back plate 6. The backlight module 30 also includes a reflector, a light guide plate and a diffusion film. The reflector is used to reflect the light reflected from the light guide plate to the reflector, the light guide plate is used to make the light emitted by the substrate splicing structure 20 more uniform, and the diffusion film is used to expand the area of ​​the light, making the light more uniform and soft. Since the backlight module 30 includes all implementation methods of all technical solutions of the above-mentioned substrate splicing structure 20, it at least has all the beneficial effects brought by all the above-mentioned implementation methods, which will not be repeated here one by one.

[0053] Reference Figure 6 and Figure 7 In one embodiment, a reflector 7 is provided on the back plate 6. The reflector 7 is provided on the side of the back plate 6 facing the substrate splicing structure 20. There are multiple reflectors 7, and the reflectors 7 are provided at the splicing of two adjacent substrate units 10. At least one reflector can be provided at each splicing (or each splicing seam) to reflect light. The backlight module 30 can be a large-sized Mini-LED backlight module 30, which is implemented by splicing substrate units 10. Splicing gaps will inevitably occur between the substrate units 10. Since the splicing of the substrate units 10 is also the splicing of the reflective sheet, and the gap at the splicing makes it impossible to set the reflective sheet, the light at the splicing seam cannot be reflected, resulting in a loss of light energy at the splicing seam, thereby affecting the display effect and regional dimming. This embodiment can reflect the light leakage at the splicing of the substrate units 10 by providing the reflector 7 on the back plate 6, thereby solving the problem that the light at the splicing of the substrate units 10 cannot be reflected, reducing the light energy loss at the splicing seam, and improving the light energy utilization rate. Furthermore, the embodiment does not increase the number of LEDs, and no more heat energy is generated, thereby compensating for light loss at the joints, making the overall uniformity more controllable, and making the grayscale adjustment through the photoresistor more precise.

[0054] Reference Figure 6 and Figure 7In one embodiment, the reflector 7 is a protruding structure formed on the back plate 6, and the outer surface of the protruding structure is coated with a reflective layer. The back plate 6 can be a metal plate, such as a copper plate or an aluminum plate. The protruding structure mainly plays a reflective role, and the reflective layer is coated on the outer surface of the protruding structure to increase the reflection. The protruding structure can be integrally formed with the back plate 6 when the back plate 6 is manufactured, or it can be formed by welding after the back plate 6 is manufactured. The reflective layer can be a silver reflective layer.

[0055] According to another aspect of the present invention, the present invention also provides a display device, including a display panel and the above-mentioned backlight module 30, and the backlight module 30 is used to provide backlight for the display panel. The display panel includes an array substrate and a color film substrate, and the backlight module 30, the array substrate and the color film plate are stacked in sequence, and a liquid crystal layer is arranged between the array substrate and the color film plate. The above-mentioned display panel can be a computer screen, a tablet screen, a TV screen, a mobile phone screen or other display screens. Since the display device includes all implementation methods of all technical solutions of the above-mentioned backlight module 30, it has at least all the beneficial effects brought by all the above-mentioned implementation methods, which will not be repeated here one by one. The above-mentioned display device can be a liquid crystal display device, such as a computer, a tablet, a TV, a mobile phone or other liquid crystal display devices.

[0056] The above are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A substrate unit, characterized in that: include: Printed circuit boards; An LED lamp array, the LED lamp array comprising a first LED lamp group and a second LED lamp group, wherein the second LED lamp group is at least partially arranged around an outer side of the first LED lamp group; A plurality of side photoresistors, wherein the side photoresistors are arranged on a side of the second LED light group away from the first LED light group; and the plurality of side photoresistors are spaced apart and distributed along an arrangement direction of the second LED light group; A surface photoresistor, wherein the LED lamp array, the edge photoresistor and the surface photoresistor are arranged on the same side of the printed circuit board, the number of the surface photoresistors is multiple, the first LED lamp group includes multiple LED lamps arranged at intervals, and at least one surface photoresistor is arranged in a gap between the LED lamps in the first LED lamp group; A control unit, wherein the control unit is electrically connected to the edge photoresistor, the surface photoresistor, the first LED light group and the second LED light group respectively, and the control unit is used to receive the current passing through the edge photoresistor and the current passing through the surface photoresistor respectively, and after modulation by the control unit, the current difference transmitted to the first LED light group and the second LED light group is made smaller than a preset value.

2. The substrate unit according to claim 1, characterized in that: The second LED light group is arranged around the outer circumference of the first LED light group.

3. The substrate unit according to claim 1, characterized in that: The first LED light group is square; The second LED light group is arranged around two adjacent sides of the first LED light group, or The second LED light group is arranged around three sides of the first LED light group.

4. The substrate unit according to any one of claims 1 to 3, characterized in that: The first LED lamp group includes a plurality of LED lamps arranged at intervals, and at least one of the surface photoresistors is arranged in the gaps between the plurality of LED lamps.

5. A substrate splicing structure, characterized in that: It comprises a plurality of substrate units according to any one of claims 1 to 4, wherein the plurality of substrate units are spliced ​​together to form a plurality of splicing seams, and the second LED lamp group is arranged close to the adjacent splicing seams.

6. A backlight module, characterized in that: It comprises a back plate and the substrate splicing structure as claimed in claim 5 arranged on the back plate.

7. The backlight module according to claim 6, characterized in that: A reflector is disposed on the back plate, and the reflector is disposed on a side of the back plate facing the substrate splicing structure. There are multiple reflectors, and at least one reflector is disposed at the splicing point of each two adjacent substrate units.

8. The backlight module according to claim 7, characterized in that: The reflector is a protruding structure formed on the back plate, and the outer surface of the protruding structure is coated with a reflective layer.

9. A display device, characterized in that: It comprises a display panel and a backlight module as claimed in any one of claims 6 to 8, wherein the backlight module is used for providing backlight for the display panel.

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