Spliced light-emitting panel, backlight module and display device

Abstract

The present application provides a spliced light-emitting panel, a backlight module and a display device. The spliced light-emitting panel includes a backplane having a receiving cavity. A plurality of substrates spliced together are arranged in the receiving cavity. A first gap is formed between two adjacent substrates. A plurality of light-emitting elements are arranged on each substrate. The plurality of light-emitting elements include a first light-emitting element adjacent to the first gap. The first light-emitting element is connected with a brightness adjustment circuit. The brightness adjustment circuit is configured to adjust the brightness of the first light-emitting element when the width of the first gap changes, so that the brightness of the first light-emitting element is proportional to the width of the first gap. The present application solves the problem that the movement of the substrates in the existing backlight module easily causes dark bands or bright spots to be formed at the substrate seams, affecting the image quality.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to a spliced light-emitting panel, a backlight module, and a display device. Background Art

[0002] Existing backlight modules generally include a backplane, on which a plurality of substrates spliced together are provided. An array of LED lights is provided on each substrate, and there is a substrate gap between adjacent substrates. The backplane and the substrates are fixed by means of adhesive or screws. When the LED lights are in a working and heating state for a long time, it is easy to affect the adhesive performance between the substrates and the backplane, so that the substrates are prone to move relative to the backplane. Moreover, when the display device is placed upright for a long time during use, it is also easy for the positions of the substrates to change, so that the width of the substrate gap will change accordingly, and it is easy to form dark bands or bright spots at the substrate gap, affecting the image quality. Summary of the Invention

[0003] Embodiments of the present application provide a spliced light-emitting panel, a backlight module, and a display device. By connecting a brightness adjustment circuit to a first light-emitting element adjacent to a first gap, when the width of the first gap changes, the brightness adjustment circuit adjusts the brightness of the first light-emitting element to be proportional to the width of the first gap, solving the problem that the movement of the substrates in the existing backlight module easily causes dark bands or bright spots to form at the substrate gap, affecting the image quality.

[0004] The present invention is implemented as follows. A spliced light-emitting panel includes a backplane having a receiving cavity. A plurality of substrates spliced together are provided in the receiving cavity. There is a first gap between adjacent substrates. A plurality of light-emitting elements are provided on each substrate. The plurality of light-emitting elements include a first light-emitting element adjacent to the first gap. The first light-emitting element is connected to a brightness adjustment circuit. The brightness adjustment circuit is configured to adjust the brightness of the first light-emitting element when the width of the first gap changes, so that the brightness of the first light-emitting element is proportional to the width of the first gap.

[0005] In one embodiment, the light-emitting element is configured to be electrically connected to a power high-potential signal input terminal and a power low-potential signal input terminal to emit light under the control of the power high-potential signal and the power low-potential signal;

[0006] The brightness adjustment circuit includes a variable resistor. The variable resistor is connected between the first light-emitting element and the power low-potential signal input terminal. The variable resistor is configured to make the resistance value of the variable resistor inversely proportional to the width of the first gap when the width of the first gap changes, so that the current value flowing through the first light-emitting element is proportional to the width of the first gap.

[0007] In one embodiment, the receiving cavity includes a bottom wall, and the variable resistor is disposed on the bottom wall and located between the bottom wall and the substrate;

[0008] The variable resistor includes a variable resistor layer, a fixed electrode and a movable electrode disposed on the variable resistor layer, and the fixed electrode is away from the first gap;

[0009] The fixed electrode is electrically connected to the low-potential signal input terminal of the power supply, the movable electrode is electrically connected to the first light-emitting element, and the movable electrode is configured to move when the width of the first gap changes, so that the distance between the movable electrode and the fixed electrode is inversely proportional to the width of the first gap, so that the resistance value of the variable resistor is inversely proportional to the width of the first gap.

[0010] In one embodiment, the number of the first light-emitting elements is multiple, and the multiple first light-emitting elements are connected in series, and the multiple first light-emitting elements after being connected in series are connected to the same variable resistor.

[0011] In one embodiment, the resistance value range of the variable resistor is 0.1Ω - 2KΩ.

[0012] In one embodiment, there are multiple first light-emitting elements adjacent to one of the two intersecting first gaps, including a fourth light-emitting element adjacent to the other first gap, and the fourth light-emitting element is connected to different brightness adjustment circuits from the other first light-emitting elements among the multiple first light-emitting elements.

[0013] In one embodiment, the receiving cavity includes a side wall, and there is a second gap between the side wall and the adjacent substrate. The multiple light-emitting elements include a second light-emitting element disposed adjacent to the second gap. The second light-emitting element is connected with a brightness adjustment circuit, and the brightness adjustment circuit is configured to adjust the brightness of the second light-emitting element when the width of the second gap changes, so that the brightness of the second light-emitting element is proportional to the width of the second gap.

[0014] In one embodiment, the first light-emitting element and the second light-emitting element are connected to different brightness adjustment circuits.

[0015] In one embodiment, there are multiple first light-emitting elements adjacent to the first gap, including a third light-emitting element adjacent to the second gap, and the third light-emitting element is connected to different brightness adjustment circuits from the other first light-emitting elements among the multiple first light-emitting elements.

[0016] The beneficial effects of the splicing light-emitting panel provided by this application are as follows: Compared with the prior art, the first light-emitting element adjacent to the first gap on the substrate of this application is connected to a brightness adjustment circuit. When the width of the first gap changes, the brightness adjustment circuit adjusts the brightness of the first light-emitting element, making the brightness of the first light-emitting element proportional to the width of the first gap. In this way, when the width of the first gap becomes larger, the luminous brightness of the first light-emitting element becomes larger, thereby improving the dark band formed by the widening of the first gap. Conversely, when the width of the first gap becomes smaller, the luminous brightness of the first light-emitting element becomes smaller, thereby improving the bright spot formed by the narrowing of the first gap, and thus effectively improving the display image quality of the display device.

[0017] An embodiment of this application also provides a backlight module, including a splicing light-emitting panel and an optical film. The optical film is disposed on one side of the splicing light-emitting panel in the light-emitting direction, and the splicing light-emitting panel is the splicing light-emitting panel described in any of the above embodiments.

[0018] The beneficial effects of the backlight module provided by this application are as follows: By adopting the above-mentioned splicing light-emitting panel, the first light-emitting element adjacent to the first gap on the substrate of this application is connected to a brightness adjustment circuit. When the width of the first gap changes, the brightness adjustment circuit adjusts the brightness of the first light-emitting element, making the brightness of the first light-emitting element proportional to the width of the first gap. In this way, when the width of the first gap becomes larger, the luminous brightness of the first light-emitting element becomes larger, thereby improving the dark band formed by the widening of the first gap. Conversely, when the width of the first gap becomes smaller, the luminous brightness of the first light-emitting element becomes smaller, thereby improving the bright spot formed by the narrowing of the first gap, and thus effectively improving the display image quality of the display device.

[0019] An embodiment of this application also provides a display device, including a backlight module and a display panel. The display panel is disposed on the light-emitting side of the backlight module, and the backlight module is the backlight module described in any of the above embodiments.

[0020] The beneficial effects of the display device provided by this application are as follows: By adopting the above-mentioned backlight module, the first light-emitting element adjacent to the first gap on the substrate of this application is connected to a brightness adjustment circuit. When the width of the first gap changes, the brightness adjustment circuit adjusts the brightness of the first light-emitting element, making the brightness of the first light-emitting element proportional to the width of the first gap. In this way, when the width of the first gap becomes larger, the luminous brightness of the first light-emitting element becomes larger, thereby improving the dark band formed by the widening of the first gap. Conversely, when the width of the first gap becomes smaller, the luminous brightness of the first light-emitting element becomes smaller, thereby improving the bright spot formed by the narrowing of the first gap, and thus effectively improving the display image quality of the display device. Description of the Drawings

[0021] Figure 1 is a top view of the splicing light-emitting panel provided by an embodiment of this application;

[0022] Figure 2 is Figure 1 the assembly structure diagram of the substrate and the backplane in

[0023] Figure 3 is Figure 1 the connection circuit diagram of the first light-emitting element and the variable resistor located on both sides of the first gap in

[0024] Figure 4 is Figure 2 and Figure 3 the structural schematic diagram of the variable resistor in

[0025] Figure 5 is Figure 1 the connection circuit diagram of the second light-emitting element and the variable resistor located on one side of the second gap in

[0026] Figure 6 is the structural schematic diagram of the backlight module provided by the embodiment of the present application;

[0027] Figure 7 is the structural schematic diagram of the display device provided by the embodiment of the present application.

[0028] Reference numerals: 1, backplane; 10, accommodation cavity; 11, bottom wall; 12, side wall;

[0029] 2, substrate; 3, light-emitting element; 31, first light-emitting element; 32, second light-emitting element; 311, third light-emitting element; 312, fourth light-emitting element;

[0030] 41, first gap; 42, second gap;

[0031] 5, variable resistor; 51, variable resistor layer; 52, fixed electrode; 53, movable electrode;

[0032] 61, power high potential signal input terminal; 62, power low potential signal input terminal;

[0033] 100, spliced light-emitting panel; 200, display panel; 300, optical film. Detailed implementation manners

[0034] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0036] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0037] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0038] It should also be noted that in the embodiments of the present application, the same reference numeral is used to represent the same component or the same part. For the same parts in the embodiments of the present application, only one of the parts or components may be marked with the reference numeral in the figure. It should be understood that the reference numeral is also applicable to other identical parts or components.

[0039] The embodiments of the present application provide a spliced light-emitting panel, a backlight module, and a display device, which solve the problem that the movement of the substrate in the existing backlight module easily causes dark bands or bright spots to form at the substrate seams, affecting the image quality.

[0040] Referring Figure 1 and Figure 2 , the spliced light-emitting panel provided by the embodiments of the present application includes a backplane 1. The backplane 1 includes a bottom wall 11 and a side wall 12. The bottom wall 11 and the side wall 12 enclose a receiving cavity 10. A plurality of substrates 2 spliced together are provided in the receiving cavity 10. A plurality of light-emitting elements 3 are provided on each substrate 2. Since a plurality of substrates 2 are spliced together, there is a first gap 41 between two adjacent substrates 2. When the substrate 2 moves relative to the backplane 1 during the use of the display device, the position of the substrate 2 changes, and accordingly, the width of the first gap 41 between the substrates 2 also changes. In this way, it is easy to form dark bands or bright spots at the first gap 41, affecting the image quality.

[0041] In the embodiment of the present application, the plurality of light-emitting elements 3 include a first light-emitting element 31 disposed adjacent to the first slit 41, and the first light-emitting element 31 is connected to a brightness adjustment circuit, and the brightness adjustment circuit is used to adjust the brightness of the first light-emitting element 31 when the width of the first slit 41 changes, so that the brightness of the first light-emitting element 31 is proportional to the width of the first slit 41. In this way, when the width of the first slit 41 increases, the luminance of the first light-emitting element 31 increases, thereby improving the dark band formed by the widening of the first slit 41, and conversely, when the width of the first slit 41 decreases, the luminance of the first light-emitting element 31 decreases, thereby improving the bright spot formed by the narrowing of the first slit 41, thereby effectively improving the display quality of the display device.

[0042] In some embodiments, the substrate 2 is square, the light-emitting element 3 can be a MiniLED lamp bead or a MicroLED lamp bead, and the multiple LED lamps on the substrate 2 are arranged in an array, so that there is only one column or one row of LED lamps adjacent to the first gap 41, and each LED lamp in a column or a row is connected to a brightness adjustment circuit, so as to ensure that the brightness at the first gap 41 can be consistent with the brightness at the center of the substrate 2, so that the brightness of each location on the entire back panel 1 is consistent, thereby improving the display effect of the display device.

[0043] refer to Figure 1 In the embodiment of the present application, four substrates 2 spliced ​​together are provided in the accommodating cavity 10, and the first gap 41 formed by the four substrates 2 is cross-shaped. The present application is described by taking the splicing of four substrates 2 as an example.

[0044] In some embodiments, reference Figure 3 The light-emitting element 3 is used to electrically connect the power high potential signal input terminal 61 and the power low potential signal input terminal 62 to emit light under the control of the power high potential signal and the power low potential signal; the multiple light-emitting elements 3 on each substrate 2 are electrically connected to the power high potential signal input terminal 61 and the power low potential signal input terminal 62, so that the multiple light-emitting elements 3 can be controlled to emit light under the same voltage, which is beneficial to reducing the difficulty of connecting the multiple light-emitting elements 3 in the circuit, and at the same time, it can also make the light-emitting brightness of the multiple light-emitting elements 3 that are only electrically connected to the power high potential signal input terminal 61 and the power low potential signal input terminal 62 remain the same, which is beneficial to maintaining the uniform light-emitting brightness of various parts of the backplane 1 and improving the display quality.

[0045] refer to Figure 3 The brightness adjustment circuit includes a variable resistor 5, which is connected between the first light-emitting element 31 and the low-potential signal input terminal 62 of the power supply. The variable resistor 5 is used to make the resistance value of the variable resistor 5 inversely proportional to the width of the first gap 41 when the width of the first gap 41 changes, so that the current value flowing through the first light-emitting element 31 is proportional to the width of the first gap 41.

[0046] With the above settings, by adjusting the resistance value of the variable resistor 5, the current value flowing through the first light-emitting element 31 can be adjusted. Moreover, the current value flowing through the first light-emitting element 31 is proportional to the width of the first slit 41. Since the greater the current value flowing through the first light-emitting element 31, the greater the brightness of the first light-emitting element 31, the brightness of the first light-emitting element 31 is proportional to the width of the first slit 41. As a result, the dark band or bright spot formed at the first slit 41 is effectively improved, and the display quality of the display device is improved.

[0047] It should be noted that the variable resistor 5 (Rheostat), also known as an adjustable resistor, is a type of resistor. The resistance value of the adjustable resistor can be adjusted manually to meet the needs of the circuit. Adjustable resistors are divided into: electronic component adjustable resistors, ceramic disc adjustable resistors, surface mount adjustable resistors, wire-wound adjustable resistors, and so on.

[0048] In the embodiment of the present application, the current value flowing through the first light-emitting element 31 is adjusted by adjusting the resistance value of the variable resistor 5, thereby adjusting the brightness of the first light-emitting element 31, making the brightness of the first light-emitting element 31 proportional to the width of the first slit 41. Therefore, the change range of the resistance value of the variable resistor 5 should correspond to the change range of the width of the first slit 41, so that the width of the first slit 41 is inversely proportional to the resistance value of the variable resistor 5. The resistance value range of the variable resistor 5 in the embodiment of the present application is 0.1Ω - 2KΩ. In this way, when the width of the first slit 41 reaches the maximum or minimum, the resistance value of the variable resistor 5 can be inversely proportional to the width of the first slit 41, so that the brightness of the first light-emitting element 31 is proportional to the width of the first slit 41.

[0049] In some embodiments, referring to Figure 2 , the variable resistor 5 can be a surface mount variable resistor. The variable resistor 5 is disposed on the bottom wall 11 and located between the bottom wall 11 and the substrate 2. In this way, not only can the space occupied by the variable resistor 5 be reduced, avoiding an increase in the volume of the backlight module, but also the installation of the variable resistor 5 is simpler and more convenient, and the variable resistor 5 is installed more stably, which is beneficial to the resistance value of the variable resistor 5 changing more accurately when the substrate 2 moves relative to the bottom wall 11.

[0050] Referring to Figure 3 and Figure 4, the variable resistor 5 includes a variable resistor layer 51, a fixed electrode 52 and a movable electrode 53 provided on the variable resistor layer 51. The fixed electrode 52 is away from the first slit 41; the fixed electrode 52 is electrically connected to the low-potential signal input terminal 62 of the power supply, and the movable electrode 53 is electrically connected to the first light-emitting element 31. The movable electrode 53 is configured to move when the width of the first slit 41 changes, so that the distance between the movable electrode 53 and the fixed electrode 52 is inversely proportional to the width of the first slit 41, so that the resistance value of the variable resistor 5 is inversely proportional to the width of the first slit 41. In this way, when the width of the first slit 41 changes, the resistance value of the variable resistor 5 is inversely proportional to the width of the first slit 41, so that the brightness of the first light-emitting element 31 is proportional to the width of the first slit 41. Thus, when the width of the first slit 41 becomes larger, the brightness of the first light-emitting element 31 adjacent to the first slit 41 becomes larger, so as to improve the dark band problem that appears at the first slit 41. When the width of the first slit 41 becomes smaller, the brightness of the first light-emitting element 31 adjacent to the first slit 41 becomes smaller, so as to improve the bright spot problem that appears at the first slit 41, thereby improving the display effect of the display device.

[0051] Exemplarily, taking Figure 2 the substrate 2 in Figure 3 as an example, the moving direction of the movable electrode 53 of the variable resistor 5 in Figure 2 corresponds to the moving direction of the substrate 2 in Figure 2 The fixed electrode 52 of the variable resistor 5 between the left substrate 2 and the bottom wall 11 in Figure 2 is located on the left side of the variable resistor 5. The fixed electrode 52 of the variable resistor 5 between the right substrate 2 and the bottom wall 11 in Figure 2 is located on the right side of the variable resistor 5. When Figure 3 the left substrate 2 in

[0052] moves to the right while the right substrate 2 remains stationary, the width of the first slit 41 between the two substrates 2 becomes smaller. At this time, referring to Figure 2 the movable electrode 53 of the variable resistor 5 under the left substrate 2 also moves to the right, so that the distance between the movable electrode 53 and the fixed electrode 52 becomes larger. As a result, the resistance value of the variable resistor 5 under the left substrate 2 becomes larger, and the current value flowing through the first light-emitting element 31 adjacent to the first slit 41 on the left substrate 2 becomes smaller, and the brightness of the first light-emitting element 31 becomes smaller, so that the brightness at the first slit 41 can be kept consistent with the brightness at other positions of the substrate 2, effectively improving the bright spot problem caused by the decrease in the width of the first slit 41 and enhancing the display image quality of the display device. Figure 3, the movable electrode 53 of the variable resistor 5 below the left substrate 2 will also move to the left, reducing the distance between the movable electrode 53 and the fixed electrode 52. As a result, the resistance value of the variable resistor 5 below the left substrate 2 decreases, and the current value flowing through the first light-emitting element 31 adjacent to the first slit 41 on the left substrate 2 increases. The brightness of the first light-emitting element 31 increases, ensuring that the brightness at the first slit 41 is consistent with that at other positions on the substrate 2. This effectively improves the dark band problem caused by the widened first slit 41 and enhances the display quality of the display device.

[0053] When Figure 2 the left substrate 2 in [reference] does not move, and the right substrate 2 moves to the left, the width of the first slit 41 between the two substrates 2 decreases. At this time, referring to Figure 3 , the movable electrode 53 of the variable resistor 5 below the right substrate 2 also moves to the left, increasing the distance between the movable electrode 53 and the fixed electrode 52. As a result, the resistance value of the variable resistor 5 below the right substrate 2 increases, and the current value flowing through the first light-emitting element 31 adjacent to the first slit 41 on the right substrate 2 decreases. The brightness of the first light-emitting element 31 decreases, ensuring that the brightness at the first slit 41 is consistent with that at other positions on the substrate 2. This effectively improves the bright spot problem caused by the narrowed first slit 41 and enhances the display quality of the display device.

[0054] When Figure 2 the left substrate 2 in [reference] does not move, and the right substrate 2 moves to the right, the width of the first slit 41 between the two substrates 2 increases. At this time, referring to Figure 3 , the movable electrode 53 of the variable resistor 5 below the right substrate 2 also moves to the right, reducing the distance between the movable electrode 53 and the fixed electrode 52. As a result, the resistance value of the variable resistor 5 below the right substrate 2 decreases, and the current value flowing through the first light-emitting element 31 adjacent to the first slit 41 on the right substrate 2 increases. The brightness of the first light-emitting element 31 increases, ensuring that the brightness at the first slit 41 is consistent with that at other positions on the substrate 2. This effectively improves the dark band problem caused by the widened first slit 41 and enhances the display quality of the display device.

[0055] When Figure 2 both the left substrate 2 and the right substrate 2 in [reference] move to the right, the width of the first slit 41 between the two substrates 2 remains unchanged. At this time, referring to Figure 3, the movable electrodes 53 of the variable resistors 5 below the left substrate 2 and the right substrate 2 will both move to the right, increasing the distance between the movable electrode 53 and the fixed electrode 52 below the left substrate 2 and decreasing the distance between the movable electrode 53 and the fixed electrode 52 below the right substrate 2. As a result, the resistance value of the variable resistor 5 below the left substrate 2 increases, and the resistance value of the variable resistor 5 below the right substrate 2 decreases. The brightness of the first light-emitting element 31 adjacent to the first slit 41 on the left substrate 2 decreases, and the brightness of the first light-emitting element 31 adjacent to the first slit 41 on the right substrate 2 increases, causing the brightness of the first light-emitting elements 31 adjacent to both sides of the first slit 41 to show a seesaw trend. In this way, the brightness at the first slit 41 can be made consistent with the brightness at other positions on the substrate 2, effectively improving the dark band problem caused by the widening of the width of the first slit 41 and enhancing the display quality of the display device. Of course, when Figure 2 both the left substrate 2 and the right substrate 2 in move to the left, the resistance values of the variable resistors 5 below the left substrate 2 and the right substrate 2 also show a seesaw trend, so that the brightness at the first slit 41 can be made consistent with the brightness at other positions on the substrate 2, enhancing the display quality of the display device.

[0056] In some embodiments, there are multiple first light-emitting elements 31 adjacent to one of the two intersecting first slits 41, including the fourth light-emitting element 312 adjacent to the other first slit 41. The fourth light-emitting element 312 is connected to different brightness adjustment circuits from the other first light-emitting elements 31 among the multiple first light-emitting elements 31. In this way, the brightness of the fourth light-emitting element 312 can be adjusted independently. Since the fourth light-emitting element 312 is located at the intersection of the two intersecting first slits 41, the brightness at any one of the two intersecting first slits 41 can be adjusted by adjusting the brightness of the fourth light-emitting element 312. Regardless of how the substrate 2 moves, the dark bands or bright spots that appear at the two intersecting first slits 41 can be improved, enhancing the display quality of the display device.

[0057] For example, Figure 1Taking the substrate 2 in the upper left corner as an example for illustration, both the right side and the lower side of the substrate 2 have a first slit 41. There are multiple first light-emitting elements 31 adjacent to the first slit 41 on the right side. The lowermost one of the multiple first light-emitting elements 31 is also adjacent to the first slit 41 on the lower side of the substrate 2. This first light-emitting element 31 is the fourth light-emitting element 312. The brightness adjustment circuit connecting the fourth light-emitting element 312 and the other first light-emitting elements 31 among the multiple first light-emitting elements 31 is different. There are multiple first light-emitting elements 31 adjacent to the first slit 41 on the lower side of the substrate 2. The rightmost one of the multiple first light-emitting elements 31 is also adjacent to the first slit 41 on the right side of the substrate 2. This first light-emitting element 31 is the fourth light-emitting element 312. That is to say, the fourth light-emitting element 312 is adjacent to the first slits 41 on both the right side and the lower side of the substrate 2. In the embodiment of the present application, the fourth light-emitting element 312 can be connected to the same brightness adjustment circuit as the first light-emitting element 31 on the right side of the substrate 2, or can be connected to the same brightness adjustment circuit as the first light-emitting element 31 on the lower side of the substrate 2, for adjusting its brightness when the width of the first slit 41 changes, so as to improve the dark band or bright spot that appears at the first slit 41.

[0058] Reference Figure 1 , Figure 1 This is only a schematic diagram of the spliced light-emitting panel of the present application. When actually manufacturing a product, generally for a large-size display device, multiple substrates 2 need to be spliced. Therefore Figure 1 This is only a schematic diagram of a simple splicing state. Taking Figure 1 as an example, at the junction of the four substrates 2, it is most vulnerable to the movement of the substrate 2, and it is also the place where the display effect or the light-emitting effect is most affected by the movement of the substrate 2. When the four substrates 2 simultaneously move towards the side wall 12 of the accommodation cavity 10 (that is, all move outward), the gap at the junction of the four substrates 2 will become wider, and at this time, dark spots are likely to appear at the junction. When the four substrates 2 simultaneously move away from the side wall 12 of the accommodation cavity 10 (that is, all move inward), the gap at the junction of the four substrates 2 will become narrower, and at this time, bright spots are likely to appear at the junction.

[0059] When multiple substrates 2 are spliced, since the moving directions of the individual substrates 2 are unknown, it is easy to cause different widths at multiple junctions. Some junctions have dark spots, and some junctions have bright spots. The appearance of multiple bright spots or dark spots affects the display quality of the display device. Therefore, by using the spliced light-emitting panel of the embodiment of the present application, the brightness of the first light-emitting elements 31 on the substrate 2 can be adjusted for the gap at each junction. When the gap at the junction widens and a dark spot appears, the brightness of the first light-emitting elements 31 adjacent to the gap at the junction is increased. When the gap at the junction narrows and a bright spot appears, the brightness of the first light-emitting elements 31 adjacent to the gap at the junction is decreased. In this way, no matter in which direction the substrate 2 moves, the brightness of the multiple junctions formed by splicing multiple substrates 2 can be well adjusted to improve dark spots or bright spots, so that the brightness at the junctions is the same as the brightness in the middle of the substrate 2, thereby improving the display quality of the display device.

[0060] Of course, the fourth light-emitting element 312 can also be connected to different brightness adjustment circuits from the first light-emitting elements 31. In this way, no matter whether the width of the first gap 41 on the right side of the substrate 2 changes or the width of the first gap 41 on the lower side of the substrate 2 changes, the brightness of the fourth light-emitting element 312 is adjusted, so as to ensure that the dark band or bright spot appearing at the first gap 41 is improved, which is beneficial to improving the overall display image quality of the display device.

[0061] In some embodiments, the number of the first light-emitting elements 31 is multiple, and the multiple first light-emitting elements 31 are connected in series, and the multiple first light-emitting elements 31 after being connected in series are connected to the same variable resistor 5. This can reduce the number of variable resistors 5 used, not only improving the installation efficiency of the variable resistor 5, but also reducing costs.

[0062] It should be noted that since the substrate 2 in the embodiment of the present application is square, and the first light-emitting elements 31 are MiniLED lamp beads or MicroLED lamp beads, there are multiple first light-emitting elements 31 adjacent to the first gap 41. When the multiple first light-emitting elements 31 are connected, they can be first connected in series and then connected to the power high-potential signal input terminal 61 and the power low-potential signal input terminal 62 to emit light under the control of the power high-potential signal and the power low-potential signal. Connecting a variable resistor 5 in series in the series circuit can achieve the purpose of simultaneously controlling the brightness of the multiple first light-emitting elements 31, greatly improving the efficiency of simultaneously controlling the brightness of the multiple first light-emitting elements 31.

[0063] Reference Figure 1 and Figure 2, in some embodiments, there is a second gap 42 between the sidewall 12 and the adjacent substrate 2. The plurality of light-emitting elements 3 includes a second light-emitting element 32 disposed adjacent to the second gap 42. The second light-emitting element 32 is connected to a brightness adjustment circuit, and the brightness adjustment circuit is configured to adjust the brightness of the second light-emitting element 32 when the width of the second gap 42 changes, so that the brightness of the second light-emitting element 32 is proportional to the width of the second gap 42. In this way, when the width of the second gap 42 changes, the brightness of the second light-emitting element 32 adjacent to the second gap 42 can be correspondingly adjusted, so that the brightness at the second gap 42 can be kept consistent with the brightness at the center position of the substrate 2, thereby effectively improving the display image quality.

[0064] In some embodiments, the brightness adjustment circuit connected to the second light-emitting element 32 is the same as the brightness adjustment circuit connected to the first light-emitting element 31, and both include a variable resistor 5. That is, the second light-emitting elements 32 are all connected to the variable resistor 5, and the variable resistor 5 connected to the second light-emitting element 32 is also disposed between the bottom wall 11 and the substrate 2, so as to Figure 1 Taking the substrate 2 in the upper left corner in [description] as an example for illustration, Figure 5 the moving direction of the movable electrode 53 of the variable resistor 5 in [description] corresponds to the moving direction of Figure 1 the substrate 2 in the upper left corner in [description]. When Figure 1 the substrate 2 in the upper left corner in [description] moves to the right, the width of the second gap 42 on the left side of the substrate 2 becomes larger. At this time, referring to Figure 5 , the movable electrode 53 of the variable resistor 5 below the substrate 2 also moves to the right, so that the distance between the movable electrode 53 and the fixed electrode 52 becomes smaller, thereby the resistance value of the variable resistor 5 below the substrate 2 becomes smaller, and the current value flowing through the second light-emitting element 32 adjacent to the second gap 42 on the substrate 2 becomes larger, and the brightness of the second light-emitting element 32 becomes larger, so that the brightness at the second gap 42 can be kept consistent with the brightness at other positions of the substrate 2, effectively improving the dark band problem caused by the increase in the width of the second gap 42 and improving the display image quality of the display device.

[0065] It should be noted that there are gaps on all four sides of the substrate 2 in the embodiments of the present application. Taking Figure 1 the substrate 2 in the upper left corner in [description] as an example for illustration, when Figure 1 the substrate 2 in the upper left corner in [description] moves relative to the bottom wall 11 along the first direction X, the widths of the second gap 42 on the left side of the substrate 2 and the first gap 41 on the right side of the substrate 2 will both change; when Figure 1 the substrate 2 in the upper left corner in [description] moves relative to the bottom wall 11 along the second direction Y, the widths of the second gap 42 on the upper side of the substrate 2 and the first gap 41 on the lower side of the substrate 2 will both change; when Figure 1When the substrate 2 in the upper left corner moves obliquely relative to the bottom wall 11, it is equivalent to the substrate 2 moving in both the first direction X and the second direction Y relative to the bottom wall 11. The widths of the second slits 42 on the upper and left sides of the substrate 2 and the first slits 41 on the lower and right sides of the substrate 2 will change. At this time, the brightness of the first light-emitting elements 31 adjacent to the first slits 41 and the second light-emitting elements 32 adjacent to the second slits 42 on the substrate 2 will be adjusted by the brightness adjustment circuit, so that the brightness at the first slits 41 and the second slits 42 can be kept consistent with the brightness at the center of the substrate 2. That is to say, when the substrate 2 moves relative to the bottom wall 11 in any direction, the display brightness of the entire backlight module can be kept uniform, effectively improving the display picture quality.

[0066] In some embodiments, the first light-emitting elements 31 and the second light-emitting elements 32 are connected to different brightness adjustment circuits. Since the first light-emitting elements 31 are adjacent to the first slits 41 and the second light-emitting elements 32 are adjacent to the second slits 42, when the substrate 2 moves relative to the bottom wall 11, the width changes of the first slits 41 and the second slits 42 on both sides of the substrate 2 in the first direction X are opposite, and the width changes of the first slits 41 and the second slits 42 on both sides of the substrate 2 in the second direction Y are also opposite. In this way, the brightness changes of the light-emitting elements 3 on both sides of the substrate 2 in the first direction X and on both sides in the second direction Y are also opposite. Therefore, connecting the first light-emitting elements 31 and the second light-emitting elements 32 to different brightness adjustment circuits is beneficial to independently adjusting the brightness of the first light-emitting elements 31 and the second light-emitting elements 32, so that the brightness at the first slits 41 and the second slits 42 is kept consistent with the brightness at the center position of the substrate 2, improving the display picture quality.

[0067] It should be noted that, in order to better adjust the brightness of the light-emitting elements 3 around the substrate 2, four variable resistors 5 can be arranged below the substrate 2. The four variable resistors 5 are respectively connected to the light-emitting elements 3 adjacent to the slits on the four sides of the substrate 2. In this way, no matter in which direction the substrate 2 moves, the brightness of the light-emitting elements 3 adjacent to the first slits 41 and the second slits 42 with width changes can be independently adjusted, so that the brightness at the first slits 41 and the second slits 42 can be independently adjusted, thereby making the brightness at each part of the entire backplane 1 consistent, which is beneficial to improving the display picture quality.

[0068] Reference Figure 1, in some embodiments, there are multiple first light-emitting elements 31 adjacent to the first gap 41, including a third light-emitting element 311 adjacent to the second gap 42. The third light-emitting element 311 is connected to a different brightness adjustment circuit from the other first light-emitting elements 31 among the multiple first light-emitting elements 31. In this way, the brightness of the third light-emitting element 311 can be adjusted independently. Since the impact of the dark band or bright spot at the second gap 42 on the display image quality is greater than that at the first gap 41, the brightness at the second gap 42 can be adjusted by adjusting the brightness of the third light-emitting element 311. Thus, when the widths of both the first gap 41 and the second gap 42 change, the brightness at the second gap 42 can be preferentially adjusted, which is more conducive to improving the display image quality of the display device.

[0069] Exemplarily, Figure 1 Taking the substrate 2 in the upper left corner as an example for illustration. The right side of the substrate 2 has a first gap 41, and there are multiple first light-emitting elements 31 adjacent to the first gap 41. The uppermost one of the multiple first light-emitting elements 31 is also adjacent to the second gap 42 on the upper side of the substrate 2. This first light-emitting element 31 is the third light-emitting element 311. The brightness adjustment circuit to which the third light-emitting element 311 is connected is different from that of the other first light-emitting elements 31 among the multiple first light-emitting elements 31. The upper side of the substrate 2 has a second gap 42, and there are multiple second light-emitting elements 32 adjacent to the second gap 42. The rightmost one of the multiple second light-emitting elements 32 is also adjacent to the first gap 41 on the right side of the substrate 2. This second light-emitting element 32 is the third light-emitting element 311. That is to say, the third light-emitting element 311 is adjacent to both the first gap 41 and the second gap 42. In the embodiments of the present application, the third light-emitting element 311 and the second light-emitting element 32 are connected to the same brightness adjustment circuit, which is used to adjust the brightness when the width of the second gap 42 changes, so as to improve the dark band or bright spot appearing at the second gap 42. In this way, when the widths of both the first gap 41 and the second gap 42 change, it can be ensured that the dark band or bright spot appearing at the second gap 42 is improved, which is conducive to enhancing the overall display image quality of the display device.

[0070] In some embodiments, the third light-emitting element 311 can also be connected to the same brightness adjustment circuit as the first light-emitting element 31. In this way, the brightness of the third light-emitting element 311 and the first light-emitting element 31 can be adjusted simultaneously to control the brightness at the first gap 41, so as to improve the dark band or bright spot appearing at the first gap 41 and enhance the display image quality of the display device.

[0071] In some embodiments, the third light-emitting element 311 is connected to a variable resistor 5, and the third light-emitting element 311 is electrically connected to the high-potential signal input terminal 61 of the power supply. The variable resistor 5 is electrically connected to the low-potential signal input terminal 62 of the power supply. The third light-emitting element 311 may be connected to the same variable resistor 5 as the second light-emitting element 32, or may be connected to the same variable resistor 5 as the first light-emitting element 31. Of course, the third light-emitting element 311 may be divided into two parts. One part adjacent to the first light-emitting element 31 is connected to the same variable resistor 5 as the first light-emitting element 31, and one part adjacent to the second light-emitting element 32 is connected to the same variable resistor 5 as the second light-emitting element 32. In this way, no matter whether the substrate 2 moves up and down or left and right, the third light-emitting element 311 can compensate for the brightness at the first gap 41 and the second gap 42, which is beneficial to improving the display quality of the display device.

[0072] Reference Figure 6 , an embodiment of the present application provides a backlight module, including a spliced light-emitting panel 100 and an optical film 300. The optical film 300 is disposed on one side of the spliced light-emitting panel 100 in the light-emitting direction. The spliced light-emitting panel 100 is the spliced light-emitting panel 100 in any of the above embodiments.

[0073] The detailed structure of the spliced light-emitting panel 100 can be referred to the above embodiments and will not be elaborated here. It can be understood that since the above spliced light-emitting panel 100 is used in the backlight module of the present application, the embodiments of the backlight module of the present application include all the technical solutions of all the above embodiments of the spliced light-emitting panel 100 and can achieve the technical effects achieved by the above technical solutions.

[0074] Reference Figure 7 , an embodiment of the present application provides a display device, including a backlight module and a display panel 200. The display panel 200 is disposed on the light-emitting side of the backlight module, and the backlight module is the backlight module in any of the above embodiments.

[0075] As described above, only the specific embodiments of the present application are provided, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all of them should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A spliced light-emitting panel, comprising a backplane (1) having a receiving cavity (10), wherein a plurality of substrates (2) spliced together are arranged in the receiving cavity (10), and a first gap (41) is formed between two adjacent substrates (2). A plurality of light-emitting elements (3) are arranged on each substrate (2). Characterized in that, The plurality of light-emitting elements (3) include a first light-emitting element (31) adjacent to the first gap (41). The first light-emitting element (31) is connected to a brightness adjustment circuit, and the brightness adjustment circuit is configured to adjust the brightness of the first light-emitting element (31) when the substrate (2) moves relative to the backplane (1) to change the width of the first gap (41), so that the brightness of the first light-emitting element (31) is proportional to the width of the first gap (41). The receiving cavity (10) includes a side wall (12), and a second gap (42) is formed between the side wall (12) and the adjacent substrate (2). The plurality of light-emitting elements (3) include a second light-emitting element (32) adjacent to the second gap (42). The second light-emitting element (32) is connected to the brightness adjustment circuit, and the brightness adjustment circuit is configured to adjust the brightness of the second light-emitting element (32) when the width of the second gap (42) changes, so that the brightness of the second light-emitting element (32) is proportional to the width of the second gap (42). The first light-emitting element (31) and the second light-emitting element (32) are connected to different brightness adjustment circuits.

2. The spliced light-emitting panel according to claim 1, Characterized in that, The light-emitting element (3) is configured to be electrically connected to a power high-potential signal input terminal (61) and a power low-potential signal input terminal (62) to emit light under the control of the power high-potential signal and the power low-potential signal. The brightness adjustment circuit includes a variable resistor (5). The variable resistor (5) is connected between the first light-emitting element (31) and the power low-potential signal input terminal (62). The variable resistor (5) is configured to make the resistance value of the variable resistor (5) inversely proportional to the width of the first gap (41) when the width of the first gap (41) changes, so that the current value flowing through the first light-emitting element (31) is proportional to the width of the first gap (41).

3. The spliced light-emitting panel according to claim 2, Characterized in that, The receiving cavity (10) includes a bottom wall (11). The variable resistor (5) is arranged on the bottom wall (11) and is located between the bottom wall (11) and the substrate (2). The variable resistor (5) includes a variable resistor layer (51), a fixed electrode (52) and a movable electrode (53) arranged on the variable resistor layer (51). The fixed electrode (52) is away from the first gap (41). The fixed electrode (52) is electrically connected to the low-potential signal input terminal (62) of the power supply. The movable electrode (53) is electrically connected to the first light-emitting element (31). The movable electrode (53) is configured to move when the width of the first gap (41) changes, such that the distance between the movable electrode (53) and the fixed electrode (52) is inversely proportional to the width of the first gap (41), so that the resistance value of the variable resistor (5) is inversely proportional to the width of the first gap (41).

4. The spliced light-emitting panel according to claim 2 or 3, wherein, the number of the first light-emitting elements (31) is multiple, the multiple first light-emitting elements (31) are connected in series, and the multiple first light-emitting elements (31) after being connected in series are connected to the same variable resistor (5); and / or, the resistance value range of the variable resistor (5) is 0.1Ω - 2KΩ.

5. The spliced light-emitting panel according to any one of claims 1 - 3, wherein, there are multiple first light-emitting elements (31) adjacent to one of the two intersecting first gaps (41), including a fourth light-emitting element (312) adjacent to the other first gap (41), and the fourth light-emitting element (312) is connected to different brightness adjustment circuits from the other first light-emitting elements (31) among the multiple first light-emitting elements (31) except the fourth light-emitting element (312).

6. The spliced light-emitting panel according to claim 1, wherein, there are multiple first light-emitting elements (31) adjacent to the first gap (41), including a third light-emitting element (311) adjacent to the second gap (42), and the third light-emitting element (311) is connected to different brightness adjustment circuits from the other first light-emitting elements (31) among the multiple first light-emitting elements (31) except the third light-emitting element (311).

7. A backlight module, comprising a spliced light-emitting panel (100) and an optical film (300), the optical film (300) is disposed on one side of the spliced light-emitting panel (100) in the light-emitting direction, wherein, the spliced light-emitting panel (100) is the spliced light-emitting panel (100) according to any one of claims 1 - 6.

8. A display device, comprising a backlight module and a display panel (200), the display panel (200) is disposed on the light-emitting side of the backlight module, wherein, the backlight module is the backlight module according to claim 7.

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