Backlight structure, display module, tiled screen, and display apparatus

Abstract

A backlight structure, a display module, a tiled screen, and a display apparatus, which relate to the technical field of display, and can solve the problem of shadow regions and bluish edges easily occurring in existing display pictures. The backlight structure comprises: a back plate (101), a lamp panel (102), and fluorescent reflective strips (103). The back plate (101) comprises a main body portion (1011) and a bending portion (1012) connected to the main body portion (1011). The lamp panel (102) is located on the main body portion (1011). The lamp panel (102) comprises a plurality of light-emitting devices (1021) arranged in an array. The lamp panel (102) has an edge area close to the bending portion (1012). The fluorescent reflective strips (103) are located on a side surface of the bending portion (1012) close to the light-emitting devices (1021) and between adjacent columns of light-emitting devices (1021) in the edge area of the lamp panel (102).

Description

Backlight structure, display module, spliced screen and display device TECHNICAL FIELD

[0001] The present disclosure belongs to the technical field of display, and particularly relates to a backlight structure, a display module, a spliced screen and a display device. BACKGROUND

[0002] Mini Light-Emitting Diode (Mini LED) technology has excellent performance on display products, and at present, Mini LED has been widely applied to commercial display, high-end television and cinema display scenes. As a kind of commercial display, spliced screens are iterated by introducing Mini LED backlight technology to upgrade product performance, which has also become a development trend. The product feature of the spliced screen is narrow frame, and at present, the market is divided into three series according to the size of the joint, that is, 3.Xmm, 1.Xmm and 0.Xmm, wherein the 0.Xmm extremely narrow joint belongs to the high-end series, and from the market positioning, it is very suitable to carry Mini LED technology to realize the picture quality improvement of high brightness, high contrast and high color gamut.

[0003] SUMMARY

[0004] The present disclosure aims to at least solve one of the technical problems existing in the prior art, and provides a backlight structure, a display module, a spliced screen and a display device.

[0005] [According to Rule 91, the first aspect is corrected on February 21, 2025] In the first aspect, the embodiments of the present disclosure provide a backlight structure, wherein the backlight structure comprises a back plate, a lamp plate and a fluorescent reflection strip;

[0006] The back plate comprises a main body part and a bending part connected with the main body part;

[0007] The lamp plate is located on the main body part; the lamp plate comprises a plurality of light emitting devices arranged in an array; the lamp plate has an edge area close to the bending part;

[0008] The fluorescent reflection strip is located between the side of the bending part close to the light emitting device and the adjacent columns of the light emitting devices in the edge area of the lamp plate.

[0009] Optionally, the lamp plate further has a central area;

[0010] The driving current of the light emitting device in the edge area is greater than the driving current of the light emitting device in the central area.

[0011] Optionally, the edge area is divided into a plurality of dimming areas;

[0012] The driving current of the light emitting device in the plurality of dimming areas gradually decreases in a direction away from the bending part.

[0013] Optionally, the backlight structure further comprises a plurality of black dots.

[0014] The black dots are located on the fluorescent reflective sheet between the adjacent columns of light emitting devices in the edge area, or the black dots are located between the adjacent rows of light emitting devices close to the bending part in the edge area.

[0015] Optionally, the backlight structure further comprises a driving board; the driving board is located on the side of the main body part away from the lamp plate and is electrically connected to the light emitting devices in the lamp plate through the via hole penetrating the main body part.

[0016] Optionally, the backlight structure further comprises a frame; the frame comprises a fixed part and a support part connected to the fixed part.

[0017] The fixed part is located on the side of the bending part away from the light emitting devices and is fixedly connected to the bending part.

[0018] The support part is connected to the fixed part and forms a first accommodating groove on the side of the fixed part close to the light emitting devices to accommodate the bending part.

[0019] The support part has a bottom surface connected to the fixed part and a top surface arranged opposite to the bottom surface.

[0020] The area of the top surface is smaller than the area of the bottom surface.

[0021] Optionally, the support part further has a side surface connecting the bottom surface and the top surface and close to the light emitting devices; the backlight structure further comprises a reflective sheet.

[0022] The reflective sheet is located on the side surface of the support part.

[0023] Optionally, the backlight structure further comprises a protective cover plate; the protective cover plate and the main body part and the bending part of the back plate form a protective cavity to accommodate the driving board.

[0024] The support part and the fixed part form a second accommodating groove on the side of the fixed part away from the light emitting devices to accommodate the protective cover plate.

[0025] [According to Rule 91 correction 21.02.2025] In a second aspect, the embodiments of the present disclosure provide a backlight structure, wherein the backlight structure comprises a back plate, a lamp plate, a fluorescent reflective strip, a plurality of black dots, a driving board, a frame, a reflective sheet and a protective cover plate.

[0026] The backboard comprises a main body part and a bending part connected with the main body part;

[0027] The lamp plate is located on the main body part, and comprises a plurality of light emitting devices arranged in an array; the lamp plate has an edge area close to the bending part;

[0028] The fluorescent reflection strip is located on the side of the bending part close to the light emitting devices and between adjacent columns of the light emitting devices in the edge area of the lamp plate;

[0029] The black dot is located on the fluorescent reflection sheet between adjacent columns of the light emitting devices in the edge area; or, the black dot is located between adjacent rows of the light emitting devices close to the bending part in the edge area;

[0030] The driving plate is located on the side of the main body part away from the lamp plate, and is electrically connected with the light emitting devices in the lamp plate through a via hole penetrating the main body part;

[0031] The frame comprises a fixed part and a support part connected with the fixed part;

[0032] The fixed part is located on the side of the bending part away from the light emitting devices, and is fixedly connected with the bending part;

[0033] The support part is connected with the fixed part, and forms a first accommodating groove on the side of the fixed part close to the light emitting devices to accommodate the bending part;

[0034] The support part has a bottom surface connected with the fixed part, and a top surface arranged opposite to the bottom surface;

[0035] The area of the top surface is smaller than the area of the bottom surface;

[0036] The support part further has a side surface connecting the bottom surface and the top surface and close to the light emitting devices;

[0037] The reflection sheet is located on the side surface of the support part;

[0038] The protective cover plate and the main body part and the bending part of the backboard form a protection cavity to accommodate the driving plate;

[0039] The support part and the fixed part form a second accommodating groove on the side of the fixed part away from the light emitting devices to accommodate the protective cover plate.

[0040] In a third aspect, the embodiments of the present disclosure provide a display module, wherein the display module comprises the backlight structure provided in the above.

[0041] Optionally, the display module further comprises a quantum dot diffusion plate.

[0042] The quantum dot diffusion plate is located on the support portion of the frame body and is attached to the top surface of the support portion;

[0043] The quantum dot diffusion plate comprises, in sequence along the direction away from the top surface of the support portion, a substrate, a color conversion film, and a brightness enhancement film.

[0044] Optionally, the color conversion film is a quantum dot material layer or a fluorescent powder film;

[0045] The central wavelength of the quantum dot material layer is the same as the central wavelength of the fluorescent reflection strip;

[0046] The fluorescent powder film is made of the same material as the fluorescent reflection strip.

[0047] Optionally, the display module further comprises a liquid crystal display panel; the liquid crystal display panel is located on the side of the quantum dot diffusion plate away from the light emitting device;

[0048] The liquid crystal display panel comprises an array substrate, a color film substrate, a liquid crystal layer, a first polarizer, and a second polarizer;

[0049] The array substrate and the color film substrate are arranged in a manner of being opposite to each other;

[0050] The liquid crystal layer is located between the array substrate and the color film substrate;

[0051] The first polarizer is located on the side of the array substrate away from the color film substrate;

[0052] The second polarizer is located on the side of the color film substrate away from the array substrate.

[0053] In a fourth aspect, the embodiments of the present disclosure provide a display module, wherein the display module comprises the backlight structure provided in the above; the display module further comprises a quantum dot diffusion plate and a liquid crystal display panel;

[0054] The quantum dot diffusion plate is located on the support portion of the frame body and is attached to the top surface of the support portion;

[0055] The liquid crystal display panel is located on the side of the quantum dot diffusion plate away from the light emitting device;

[0056] The quantum dot diffusion plate comprises, in sequence along the direction away from the top surface of the support portion, a substrate, a color conversion film, and a brightness enhancement film.

[0057] The liquid crystal display panel comprises an array substrate, a color film substrate, a liquid crystal layer, a first polarizer, and a second polarizer;

[0058] The array substrate and the color film substrate are arranged in a manner of being opposite to each other.

[0059] The liquid crystal layer is located between the array substrate and the color film substrate.

[0060] The first polaroid is located on a side of the array substrate away from the color film substrate.

[0061] The second polaroid is located on a side of the color film substrate away from the array substrate.

[0062] In a fifth aspect, the embodiments of the present disclosure provide a tiled screen, wherein the tiled screen comprises a plurality of display modules as described above.

[0063] In a sixth aspect, the embodiments of the present disclosure provide a display device, wherein the display device comprises a tiled screen as described above. BRIEF DESCRIPTION OF DRAWINGS

[0064] FIG. 1a is a structural schematic diagram of an exemplary tiled screen.

[0065] FIG. 1b is an enlarged schematic diagram of a seam area of the tiled screen shown in FIG. 1.

[0066] FIG. 2 is a luminance curve of the tiled screen shown in FIG. 1a at the seam area.

[0067] FIG. 3a is a structural and display effect schematic diagram of an ideal optical architecture.

[0068] FIG. 3b is a structural and display effect schematic diagram of an actual optical architecture.

[0069] FIG. 4 is an experimental analysis and mechanism schematic diagram of edge area blue light emission of the tiled screen.

[0070] FIG. 5 is a structural schematic diagram of a backlight structure provided by the embodiments of the present disclosure.

[0071] FIG. 6a is a spectral schematic diagram of different concentrations of fluorescent powder.

[0072] FIG. 6b is a chromaticity and color coordinate schematic diagram of different concentrations of fluorescent powder.

[0073] FIG. 7a is an edge color coordinate distribution schematic diagram of a display picture when a backlight structure without fluorescent reflection strips is applied to the tiled screen.

[0074] FIG. 7b is an edge color coordinate distribution schematic diagram of a display picture when a backlight structure with fluorescent reflection strips is applied to the tiled screen.

[0075] FIG. 8a is a luminance curve schematic diagram of the actual optical architecture.

[0076] FIG. 8b is a luminance curve schematic diagram of the actual optical architecture after adjusting the driving current of the edge area light emitting device.

[0077] FIG. 8c is a schematic diagram of a luminance curve of an actual optical structure after adjusting the driving current of the edge region light-emitting device and increasing the black dot.

[0078] FIG. 9 is a schematic diagram of a structure of a display module provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0079] To enable persons skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is further described in detail below with reference to the drawings and specific embodiments.

[0080] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood as the usual meaning understood by a person skilled in the art in the field to which the present disclosure belongs. The terms "first", "second", and similar terms used in the present disclosure do not represent any order, number, or importance, but are only used to distinguish different components. Similarly, the terms "one", "an", or "the" and similar terms do not represent a quantity limitation, but represent the existence of at least one. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like only represent relative positional relationships, which can change accordingly when the absolute position of the described object changes.

[0081] FIG. 1a is a schematic diagram of a structure of an exemplary tiled screen, and FIG. 1b is an enlarged schematic diagram of a seam area of the tiled screen shown in FIG. 1a. As shown in FIG. 1a and FIG. 1b, the tiled screen can be composed of four independent display modules composed of Mini LED backlight structures and liquid crystal display panels, etc. There is a significant luminance attenuation at the edge of a single display module, forming a shadow area at the edge of the display picture.

[0082] The seam of the tiled screen shown in FIG. 1a can be 0.Xmm, specifically, the actual physical seam is 2 to 3 pixels. FIG. 2 is a luminance curve of the tiled screen shown in FIG. 1a at the seam area. As shown in FIG. 2, the shadow area at the edge of the display picture of the tiled screen in the display state directly extends to more than 5 pixels.

[0083] Figure 3a is a schematic diagram of the structure and display effect of an ideal optical architecture, and Figure 3b is a schematic diagram of the structure and display effect of an actual optical architecture. As shown in Figure 3a, for a traditional non-Mini LED direct backlight structure, the scheme for achieving improvement in peripheral brightness uniformity is usually to set the distance A between the edge of the lamp panel and the edge of the backboard to about 1 / 2 of the distance B between adjacent light emitting devices, so that the light energy of the edge region is basically consistent with the central region. In this way, the edge region brightness curve decay region is small, and there is no shadow at the edge of the picture. However, for a Mini LED backlight structure, due to the large number of light emitting devices, the distance B between adjacent light emitting devices is generally on the order of 10 mm. If the distance A between the edge of the lamp panel and the edge of the backboard is set to about 1 / 2 of the distance B between adjacent light emitting devices, the distance A between the edge of the lamp panel and the edge of the backboard should be about 5 mm. As shown in Figure 3b, the area outside the light emitting devices in the edge region of the lamp panel in the actual optical architecture needs to be placed with structural members such as backboards, frames, screws, and protective plates. In particular, for COG lamp panels, due to process limitations on the binding side of the flexible circuit board, the distance between the light emitting devices at the edge of the lamp panel and the edge of the lamp panel is more than 5 mm. Therefore, the distance A between the edge of the lamp panel and the edge of the backboard is about 15 mm, which is much larger than 5 mm. The edge brightness curve decay region is large, and a shadow region is generated at the edge of the picture, which makes the overall visual seam much larger than the physical seam, greatly affecting the display effect and reducing the user experience.

[0084] When the backlight source in the spliced screen adopts a direct backlight structure, in order to be used with quantum dot materials, the light emitted by the light emitting device is blue, which is prone to the phenomenon of blue emission in the edge region, especially in the case of a large mixing distance, for example, more than 10 mm.

[0085] Figure 4 is a schematic diagram of experimental analysis and mechanism of blue emission in the edge region of the spliced screen. As shown in Figure 4, only a single sub-region is lit: from the measured brightness and chroma distribution curve, the single region light spot has high center brightness, low color coordinates (color is biased blue), and reduced edge brightness and rising color coordinates (color is biased yellow). As shown in the theoretical model in the figure, since the red and green light (synthetic yellow light) excited by the quantum dot layer is scattered light, the backscattered yellow light is extended towards the edge of the light spot after mixing. Therefore, the single light spot is a non-uniform color light spot with a blue center and a yellow edge. In the case of large area lighting: the picture can be decomposed into the effect of single light spot after two-dimensional superposition. As can be seen from the theoretical model in the figure, since there is relatively less yellow light in the edge region than in the center region, the picture edge appears visually blue. The measured edge brightness of the lit area decreases while the color coordinates also decrease. Increasing the area of the lit area until the entire surface is lit, the picture edge always appears dark. In the case of full surface lighting, the driving current of the edge region is increased. The results show that the edge brightness is improved compared to the case of large area lighting, but the proportion of yellow light in the edge region is lower, and the visual effect is more blue.

[0086] To at least solve one of the above technical problems, the backlight structure, display module, spliced screen and display device are provided by the embodiments of the present disclosure. The backlight structure, display module, spliced screen and display device provided by the embodiments of the present disclosure will be described in further detail below in combination with the accompanying drawings and specific embodiments.

[0087] [According to Rule 91 correction 21.02.2025] In a first aspect, the embodiments of the present disclosure provide a backlight structure. FIG. 5 is a structural schematic diagram of the backlight structure provided by the embodiments of the present disclosure. As shown in FIG. 5, the backlight structure comprises a back plate 101, a lamp plate 102 and a fluorescent reflection strip 103. The back plate 101 comprises a main body part 1011 and a bending part 1012 connected with the main body part 1011. The lamp plate 102 is located on the main body part 1011. The lamp plate 102 comprises a plurality of light emitting devices 1021 arranged in an array. The lamp plate 102 has an edge area close to the bending part 1012. The fluorescent reflection strip 103 is located in the edge area of the lamp plate 102 between adjacent columns of light emitting devices 1021 on the side surface 1012a of the bending part 1012 close to the light emitting devices 1021.

[0088] The back plate 101 can be made of a metal material with high strength, for example, a stainless steel plate, an aluminum plate or a galvanized steel plate, etc. The thickness of the back plate 101 can be 0.1mm to 0.15mm. The back plate 101 can be processed by stamping process, etc. to bend the back plate 101 to form the main body part 1011 and the bending part 1012 connected with the main body part 1011. The main body part 1011 can be on a first plane, and the bending part 1012 can be on a second plane. The first plane and the second plane can intersect, for example, the first plane and the second plane are perpendicular, that is, the main body part 1011 and the bending part 1012 are perpendicular to each other. It can be understood that the bending angle between the main body part 1011 and the bending part 1012 can also be other angles, which can be set according to actual needs, and is not limited here.

[0089] The lamp panel 102 can provide a backlight source, which can include a plurality of light emitting devices 1021 arranged in an array, specifically a Mini Light-Emitting Diode (Mini LED), specifically a blue Mini LED, which can emit blue light and be converted into white light in cooperation with a quantum dot conversion layer and the like. The Mini LED has the advantages of a large number of partitions, high brightness, high dynamic contrast and the like. The lamp panel 102 can further include a flexible printed circuit (FPC) connected to the Mini LED. The Mini LED can be connected to an external circuit through the FPC to provide a driving current for the Mini LED to drive the Mini LED to emit light. Of course, the Mini LED can also be connected to a printed circuit board (PCB), which has the same function as the FPC described above, and will not be described here. The lamp panel 102 has an edge area close to the bending portion 1012, which can correspond to a shadow area of the edge of the display screen, and generally 5 to 10 columns of Mini LEDs can be provided.

[0090] The fluorescent reflection strip 103 can use a reflective sheet material such as foamed polyethylene terephthalate (PET) as a substrate, and the surface is printed with fluorescent ink by a screen printing process. The fluorescent ink can use yttrium aluminum garnet (YAG), silicate or nitride materials commonly used for white light LEDs, including a mixture of red and green powders. The central wavelength of the fluorescent powder is the same as that of the quantum dot material in the cooperating quantum dot material layer. Typically, the central wavelength of the red powder is 625 nm, and the central wavelength of the green powder is 535 nm. The fluorescent ink is mixed with a resin solvent, fluorescent powder and an additive, and after screen printing, ultraviolet curing is generally used to form a film. The concentration of the fluorescent ink and the width of the fluorescent reflection strip 103 used can be determined according to the width of the edge shadow area. The higher the concentration of the fluorescent powder used, the greater the increase in the color coordinates of the corresponding position, and the higher the degree of color compensation. FIG. 6a is a schematic diagram of the spectrum of different concentrations of fluorescent powder, and FIG. 6b is a schematic diagram of the chromaticity and color coordinates of different concentrations of fluorescent powder. The concentration of the fluorescent powder can be adjusted according to the relationship shown in FIGS. 6a and 6b to eliminate the phenomenon of blue emission in the edge area.

[0091] FIG. 7a is a schematic diagram of the edge color coordinate distribution of the display picture when the backlight structure without the fluorescent reflection strip is applied to the spliced screen, and FIG. 7b is a schematic diagram of the edge color coordinate distribution of the display picture when the backlight structure with the fluorescent reflection strip is applied to the spliced screen. As shown in FIG. 7a and FIG. 7b, in the case without the fluorescent reflection strip 103, the edge color coordinate curve of the display picture decreases, which shows that the edge of the display picture is blue. In the case with the fluorescent reflection strip 103, the edge color coordinate of the display picture is stable, which shows that the color of the edge of the display picture is uniform.

[0092] In the backlight structure provided by the embodiment of the present disclosure, the bending part 1012 of the backboard 101 is provided with the fluorescent reflection strip 103 close to the side surface of the light emitting device 1021 and the edge area of the lamp plate 102 between the adjacent columns of light emitting devices 1021 during light emission. The fluorescent reflection strip 103 can absorb a small part of blue light and excite red light and green light, so as to avoid the color of the edge of the display picture from being blue, thereby making the color of the display picture uniform and improving the display effect.

[0093] In some embodiments, the lamp plate 102 also has a central area (not shown in the figure); the driving current of the light emitting device 1021 in the edge area is greater than that of the light emitting device 1021 in the central area.

[0094] In the actual optical architecture, the distance A between the light emitting device 1021 at the edge of the lamp plate and the edge of the backboard 101 is greater than the distance B between the adjacent light emitting devices, the light energy reaching the edge area is weaker than that of the central area, and there is a 20mm wide luminance decay area in the display picture. The luminance decay is usually between the first Mini LED and the second Mini LED, and the luminance decay area is the edge shadow area of the display picture. In the embodiment of the present disclosure, the driving current of the light emitting device 1021 in the edge area is greater than that of the light emitting device 1021 in the central area, which can improve the luminance of the light emitting device 1021 in the edge area, so that the luminance of the light emitting device 1021 in the edge area is consistent with that of the light emitting device 1021 in the central area, avoiding the appearance of the edge shadow area of the display picture, thereby improving the luminance uniformity of the display picture and improving the display effect. In some embodiments, the edge area is divided into a plurality of dimming areas; the driving current of the light emitting device 1021 in the plurality of dimming areas decreases step by step along the direction away from the bending part.

[0095] In the lamp panel 102, the closer to the bending part 1012 in the edge area B, the more serious the luminance attenuation of the light emitting device 1021 therein, and the lower the luminance. The edge area can be divided into multiple dimming areas; specifically, the multiple dimming areas can be a first dimming area, a second dimming area, and a third dimming area, for example, the first dimming area is provided with two columns of light emitting devices 1021, the second dimming area is provided with two columns of light emitting devices 1021, and the third dimming area is provided with 1-6 columns of light emitting devices 1021. Along the direction away from the bending part, the driving current of the light emitting device 1021 in the multiple dimming areas gradually decreases, for example, the duty cycle of the driving current of the light emitting device 1021 in the first dimming area is 100%, the duty cycle of the driving current of the light emitting device 1021 in the second dimming area is 90%, and the duty cycle of the driving current of the light emitting device 1021 in the third dimming area is 80%, so that the luminance of the light emitting device 1021 in each dimming area in the edge area can be kept consistent, and the display picture edge shadow area can be avoided, thereby further improving the luminance uniformity of the display picture and improving the display effect.

[0096] In some embodiments, as shown in FIG. 5, the backlight structure further comprises: a plurality of black dots 104; the black dots 104 are located on the fluorescent reflector 103 between the adjacent columns of light emitting devices 1021 close to the bending part in the edge area.

[0097] FIG. 8a is a schematic diagram of the luminance curve of the actual optical structure, as shown in FIG. 8a, the driving current of each area is the same, and the relative loudness attenuation of the light emitting device 1021 in the edge area (0-20mm) is obvious, and the display picture edge shadow area is prone to occur. FIG. 8b is a schematic diagram of the luminance curve of the actual optical structure after adjusting the driving current of the light emitting device in the edge area, as shown in FIG. 8b, by adjusting the driving current of the light emitting device 1021 in the edge area, the display picture edge shadow area can be reduced, but the bright lines with over-bright luminance are prone to occur in some areas (10-40mm). FIG. 8c is a schematic diagram of the luminance curve of the actual optical structure after adjusting the driving current of the light emitting device in the edge area and adding black dots, as shown in FIG. 8c, the black dots 104 are arranged on the fluorescent reflector 103 between the adjacent columns of light emitting devices 1021 close to the bending part 1012 in the edge area. The black dots 104 can absorb light, achieving the effect of eliminating bright lines, improving the luminance of the 5-10 columns of light emitting devices 1021 at the edge of the lamp panel 102 while ensuring the uniformity of the luminance in the edge area. It can be understood that the black dots 104 can also be located between the adjacent rows of light emitting devices 1021 close to the bending part 1012 in the edge area.

[0098] In some embodiments, as shown in FIG. 5, the backlight structure further comprises: a driving board 105; the driving board 105 is located on the side of the main body part 1011 away from the lamp plate 102, and is electrically connected with the light emitting device 1021 in the lamp plate 102 through the via hole penetrating through the main body part 1011.

[0099] The driving board 105 can provide driving current for the light emitting device 1021 in the lamp plate 102 to drive the light emitting device 1021 to emit light. The main body part 1011 is provided with a via hole at one end close to the bending part 1012, and the flexible circuit board can pass through the via hole, one end connected with the driving board 105, and the other end connected with the light emitting device 1021 in the lamp plate 102. In this way, the driving board 105 can occupy a larger space on the main body part 1011, so that a larger number of light emitting devices 1021 can be arranged to improve the display brightness.

[0100] As shown in FIG. 5, the backlight structure further comprises: a frame 106; the frame 106 comprises: a fixed part 1061 and a support part 1062 connected with the fixed part 1061; the fixed part 1061 is located on the side of the bending part 1012 away from the light emitting device 1021, and is fixedly connected with the bending part 1012; the support part 1062 is connected with the fixed part 1061, and forms a first accommodating groove M1 on the side of the fixed part 1061 close to the light emitting device 1021 to accommodate the bending part 1012.

[0101] The frame 106 can be made of aluminum extrusion frame, and the fixed part 1061 and the support part 1062 can be made of one-piece structure. The fixed part 1061 can be fixedly connected with the bending part 1012 by screws or other components to realize the fixation between the frame 106 and the back plate 101. The support part 1062 can be used to support the quantum dot conversion layer and other structures, and a right-angle first accommodating groove M1 can be formed between the support part 1062 and the fixed part 1061. The first accommodating groove M1 can accommodate the bending part 1012, so that the bending part 1012 can be embedded in the first accommodating groove M1 of the frame 106, reducing the space occupied by the bending part 1012 in the back plate 101 and reducing the frame of the backlight structure.

[0102] In some embodiments, as shown in FIG. 5, the support part 1062 has a bottom surface 1062a connected with the fixed part 1061, and a top surface 1062b oppositely arranged with the bottom surface 1062a; the area of the top surface 1062b is smaller than the area of the bottom surface 1062a.

[0103] Since the light emitted by the light emitting device 1021 is scattered light, the area of the top surface 1062b of the support part 106 is smaller than the area of the bottom surface 1062a, which can avoid the occlusion of the support part 106 to the light and avoid the generation of shadow. In addition, the smaller area of the top surface 1062b can improve the precision and straightness of the frame 106.

[0104] In some embodiments, as shown in FIG. 5, the support portion 1062 further has a side surface 1062c connecting the bottom surface 1062a and the top surface 1062b and close to the light emitting device 1021; the backlight structure further comprises a reflective sheet 107; the reflective sheet 107 is located on the side surface 1062c of the support portion 1062.

[0105] The reflective sheet 107 can reflect the light emitted by the light emitting device 1021, improve the brightness of the edge, and improve the light utilization rate of the light emitting device 1021.

[0106] In some embodiments, as shown in FIG. 5, the backlight structure further comprises a protective cover plate 108; the protective cover plate 108 and the main body portion 1011 and the bent portion 1012 of the back plate 101 form a protection cavity to accommodate the driving board 105.

[0107] The shape of the protective cover plate 108 can be similar to that of the back plate 101, that is, a bent shape. The protective cover plate 108 and the main body portion 1011 and the bent portion 1012 of the back plate 101 form a protection cavity, and the driving board 105 is located in the protection cavity, which can protect the driving board 105 and prevent external stress from damaging the driving board 105 and affecting the display effect.

[0108] In some embodiments, as shown in FIG. 5, the support portion 1062 and the fixing portion 1061 form a second accommodating groove M2 on the side of the fixing portion 1061 away from the light emitting device 1021 to accommodate the protective cover plate 108.

[0109] The support portion 1062 and the fixing portion 1061 can form a right-angled second accommodating groove M2, which can accommodate the protective cover plate 108, so that the protective cover plate 108 is embedded in the second accommodating groove M2 of the frame 106, reducing the space occupied by the protective cover plate 108 and reducing the frame of the backlight structure.

[0110] [Corrected according to Rule 91 on 21.02.2025] In a second aspect, the embodiments of the present disclosure provide a backlight structure, as shown in FIG. 5, the backlight structure comprises a back plate 101, a lamp plate 102, a fluorescent reflective strip 103, a plurality of black dots 104, a driving board, a frame, a reflective sheet and a protective cover plate.

[0111] The back plate 101 comprises a main body part 1011 and a bending part 1012 connected with the main body part 1011; the lamp plate 102 is located on the main body part 1011; the lamp plate 102 comprises a plurality of light emitting devices 1021 arranged in an array; the lamp plate 102 has an edge area close to the bending part 1012; the fluorescent reflection strips 103 are located in the edge area of the lamp plate 102 close to the side surface 1012a of the bending part 1012 and between adjacent columns of the light emitting devices 1021; the black dot 104 is located on the fluorescent reflection strip 103 in the edge area and between adjacent columns of the light emitting devices 1021 close to the bending part 1012; the driving plate 105 is located on the side of the main body part 1011 away from the lamp plate 102 and is electrically connected with the light emitting devices 1021 in the lamp plate 102 through the via hole penetrating through the main body part 1011; the frame 106 comprises a fixing part 1061 and a supporting part 1062 connected with the fixing part 1061; the fixing part 1061 is located on the side of the bending part 1012 away from the light emitting devices 1021 and is fixedly connected with the bending part 1012; the supporting part 1062 is connected with the fixing part 1061 and forms a first accommodating groove M1 on the side of the fixing part 1061 close to the light emitting devices 1021 to accommodate the bending part 1012; the supporting part 1062 has a bottom surface 1062a connected with the fixing part 1061 and a top surface 1062b oppositely arranged with the bottom surface 1062a; the area of the top surface 1062b is smaller than the area of the bottom surface 1062a; the supporting part 1062 further has a side surface 1062c connected with the bottom surface 1062a and the top surface 1062b and close to the light emitting devices 1021; the backlight structure further comprises a reflection sheet 107; the reflection sheet 107 is located on the side surface 1062c of the supporting part 1062; the protection cover plate 108 and the main body part 1011 and the bending part 1012 of the back plate 101 form a protection cavity to accommodate the driving plate 105; the supporting part 1062 and the fixing part 1061 form a second accommodating groove M2 on the side of the fixing part 1061 away from the light emitting devices 1021 to accommodate the protection cover plate 108.

[0112] The backlight structure provided by the embodiments of the present disclosure can refer to the implementation principle of the backlight structure provided by the first aspect, and will not be described in detail here.

[0113] In a third aspect, the embodiments of the present disclosure provide a display module. FIG. 9 is a structural schematic diagram of a display module provided by an embodiment of the present disclosure. As shown in FIG. 9, the display module comprises the backlight structure provided by any of the above embodiments. The display module further comprises a quantum dot diffusion plate 201; the quantum dot diffusion plate 201 is located on the supporting part 1062 of the frame 106 and is attached to the top surface 1062b of the supporting part 1062.

[0114] Specifically, the quantum dot diffusion plate 201 comprises, in sequence along the direction away from the top surface 1062b of the support portion 1062: a substrate 2011, a color conversion film 2012, and a brightness enhancement film 2013.

[0115] The substrate 2011 can be a glass substrate (thickness 1.1 mm) with diffusion ink coated on the upper / lower surfaces, and the color conversion film 2012 and the brightness enhancement film 2013 are sequentially attached to the upper surface of the substrate 2011. The color conversion film 2012 can be a quantum dot material film or a fluorescent powder film, and the center wavelength of the quantum dot material layer is the same as that of the fluorescent reflection strip 103. The fluorescent powder film is the same material as the fluorescent reflection strip 103. The brightness enhancement film 2013 is a BEF or DBEF or a composite film of both, and the attachment of the glass substrate and the film material can be achieved by full attachment of optically clear adhesive (OCA). The color conversion film 2012 can perform blue light mixing, and through the scattering effect of the diffusion ink on the upper / lower surfaces of the glass substrate and the reflective sheet on the surface of the lamp panel 102, the Mini LED array light source is converted into a uniform blue light area light source. The quantum dot material film or the fluorescent powder film can absorb part of the blue light and excite red / green light to convert the blue light Mini LED light source into the required white light. The prism condensing effect of the brightness enhancement film 2013 can improve the brightness of the light, or the reflective polarizing sheet of the brightness enhancement film 2013 can improve the light transmittance. Compared with traditional plastic diffusion plates, the quantum dot diffusion plate 201 made of glass substrate has high strength and small thermal expansion coefficient, and can be directly attached and fixed with the frame 106.

[0116] In some embodiments, as shown in FIG. 9, the display module further comprises: a liquid crystal display panel 202, which is located on the side of the quantum dot diffusion plate 201 away from the light emitting device 1021.

[0117] Specifically, the liquid crystal display panel 202 comprises: an array substrate 2021, a color film substrate 2022, a liquid crystal layer 2023, a first polarizing sheet 2024, and a second polarizing sheet 2025; the array substrate 2021 and the color film substrate 2022 are arranged in a box shape; the liquid crystal layer 2023 is located between the array substrate 2021 and the color film substrate 2022; the first polarizing sheet 2024 is located on the side of the array substrate 2021 away from the color film substrate 2022; and the second polarizing sheet 2025 is located on the side of the color film substrate 2022 away from the array substrate 2021.

[0118] The array substrate 2021 can provide a driving voltage by controlling the on-off of the thin film transistor therein, drive the liquid crystal molecules in the liquid crystal layer 2023 to deflect, so as to transmit the light provided by the backlight structure. The color filter substrate 2022 can filter the white light to form monochromatic light of corresponding colors, so as to realize color display. The first polarizer 2024 and the second polarizer 2025 can convert the circularly polarized light emitted by the light emitting device 1021 into linearly polarized light to transmit the liquid crystal molecules in the liquid crystal layer 2023.

[0119] In a fourth aspect, the display module provided by the embodiments of the present disclosure includes the backlight structure provided by any of the above embodiments. The display module further includes a quantum dot diffusion plate 201, the quantum dot diffusion plate 201 is located on the support portion 1062 of the frame 106 and is attached to the top surface 1062b of the support portion 1062, and the liquid crystal display panel 202 is located on the side of the quantum dot diffusion plate 201 away from the light emitting device 1021. The quantum dot diffusion plate 201 includes a substrate 2011, a color conversion film 2012 and a brightness enhancement film 2013 arranged in sequence along the direction away from the top surface 1062b of the support portion 1062. The liquid crystal display panel 202 includes an array substrate 2021, a color filter substrate 2022, a liquid crystal layer 2023, a first polarizer 2024 and a second polarizer 2025. The array substrate 2021 and the color filter substrate 2022 are arranged in a sandwiched manner. The liquid crystal layer 2023 is located between the array substrate 2021 and the color filter substrate 2022. The first polarizer 2024 is located on the side of the array substrate 2021 away from the color filter substrate 2022. The second polarizer 2025 is located on the side of the color filter substrate 2022 away from the array substrate 2021.

[0120] The display module provided by the embodiments of the present disclosure can refer to the implementation principle of the display module provided by the third aspect described above, and details are not repeated here.

[0121] In a fifth aspect, the display module provided by the embodiments of the present disclosure includes the display module provided by any of the above embodiments. The implementation principle is similar to that of the backlight structure and the display module described above, and details are not repeated here.

[0122] In a sixth aspect, the display device provided by the embodiments of the present disclosure includes the display module provided by any of the above embodiments. The implementation principle is similar to that of the backlight structure, the display module and the display module described above, and details are not repeated here.

[0123] It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essence of the present disclosure, and these modifications and improvements are also considered within the protection scope of the present disclosure.

Claims

1. A backlight structure, wherein, The backlight structure comprises a back plate, a lamp plate and a fluorescent reflection strip; The back plate comprises a main body part and a bending part connected with the main body part; The lamp plate is located on the main body part; the lamp plate comprises a plurality of light emitting devices arranged in an array; the lamp plate has an edge area close to the bending part; The fluorescent reflection strip is located on the side of the bending part close to the light emitting devices and between adjacent columns of the light emitting devices in the edge area of the lamp plate.

2. The backlight structure of claim 1, wherein, The lamp plate further has a central area; The driving current of the light emitting devices in the edge area is greater than that of the light emitting devices in the central area.

3. The backlight structure of claim 2, wherein, The edge area is divided into a plurality of dimming areas; The driving current of the light emitting devices in the plurality of dimming areas gradually decreases in a direction away from the bending part.

4. The backlight structure of claim 3, wherein, The backlight structure further comprises a plurality of black dots; The black dots are located on the fluorescent reflection sheet between adjacent columns of the light emitting devices in the edge area; or the black dots are located between adjacent rows of the light emitting devices close to the bending part in the edge area.

5. The backlight structure of claim 1, wherein, The backlight structure further comprises a driving board; the driving board is located on the side of the main body part away from the lamp plate and is electrically connected with the light emitting devices in the lamp plate through a via hole penetrating the main body part.

6. The backlight structure of claim 5, wherein, The backlight structure further comprises a frame; the frame comprises a fixing part and a supporting part connected with the fixing part; The fixing part is located on the side of the bending part away from the light emitting devices and is fixedly connected with the bending part; The supporting part is connected with the fixing part and forms a first accommodating groove on the side of the fixing part close to the light emitting devices to accommodate the bending part; The supporting part has a bottom surface connected with the fixing part and a top surface arranged opposite to the bottom surface; The area of the top surface is smaller than that of the bottom surface.

7. The backlight structure of claim 6, wherein, The supporting part further has a side surface connecting the bottom surface and the top surface and close to the light emitting devices; The backlight structure further comprises a reflection sheet; The reflection sheet is located on the side surface of the supporting part.

8. The backlight structure of claim 6, wherein, The backlight structure further comprises a protective cover plate; the protective cover plate and the main body part and the bending part of the back plate form a protection cavity to accommodate the driving board; The supporting part and the fixing part form a second accommodating groove on the side of the fixing part away from the light emitting devices to accommodate the protective cover plate.

9. [Amended according to Rule 91 on 21.02.2025] A backlight structure, wherein, The backlight structure comprises a back plate, a lamp plate, a fluorescent reflection strip, a plurality of black dots, a driving board, a frame, a reflection sheet and a protective cover plate; The back plate comprises a main body part and a bending part connected with the main body part; The lamp plate is located on the main body part; the lamp plate comprises a plurality of light emitting devices arranged in an array; the lamp plate has an edge area close to the bending part; The fluorescent reflection strip is located on the side of the bending part close to the light emitting devices and between adjacent columns of the light emitting devices in the edge area of the lamp plate. The black dots are located on the fluorescent reflection sheet between adjacent columns of the light emitting devices in the edge area; or the black dots are located between adjacent rows of the light emitting devices close to the bending part in the edge area. The driving plate is located on the side of the main body part away from the lamp plate and is electrically connected with the light emitting device in the lamp plate through a via hole penetrating through the main body part; The frame body comprises a fixed part and a supporting part connected with the fixed part; The fixed part is located on the side of the bending part away from the light emitting device and is fixedly connected with the bending part; The supporting part is connected with the fixed part and forms a first accommodating groove on the side of the fixed part close to the light emitting device to accommodate the bending part; The supporting part has a bottom surface connected with the fixed part and a top surface arranged opposite to the bottom surface; The area of the top surface is smaller than the area of the bottom surface; The supporting part further has a side surface connecting the bottom surface and the top surface and close to the light emitting device; The reflecting sheet is located on the side surface of the supporting part; The protective cover plate forms a protection cavity with the main body part and the bending part of the back plate to accommodate the driving plate; The supporting part and the fixed part form a second accommodating groove on the side of the fixed part away from the light emitting device to accommodate the protective cover plate.

10. A display module, wherein, The display module comprises the backlight structure according to any one of claims 1 to 9.

11. The display module of claim 10, wherein, The display module further comprises a quantum dot diffusion plate; The quantum dot diffusion plate is located on the supporting part of the frame body and is attached to the top surface of the supporting part; The quantum dot diffusion plate comprises, in sequence along the direction away from the top surface of the supporting part, a substrate, a color conversion film and a brightness enhancement film.

12. The display module of claim 11, wherein, The color conversion film is a quantum dot material layer or a fluorescent powder film; The central wavelength of the quantum dot material layer is the same as the central wavelength of the fluorescent reflecting strip; The fluorescent powder film is made of the same material as the fluorescent reflecting strip.

13. The display module of claim 11, wherein, The display module further comprises a liquid crystal display panel; the liquid crystal display panel is located on the side of the quantum dot diffusion plate away from the light emitting device; The liquid crystal display panel comprises an array substrate, a color film substrate, a liquid crystal layer, a first polarizing sheet and a second polarizing sheet; The array substrate and the color film substrate are arranged in a manner of being opposite to each other; The liquid crystal layer is located between the array substrate and the color film substrate; The first polarizing sheet is located on the side of the array substrate away from the color film substrate; The second polarizing sheet is located on the side of the color film substrate away from the array substrate.

14. A display module, wherein, The display module comprises the backlight structure according to any one of claims 1 to 12; The display module further comprises a quantum dot diffusion plate and a liquid crystal display panel; The quantum dot diffusion plate is located on the supporting part of the frame body and is attached to the top surface of the supporting part; The liquid crystal display panel is located on the side of the quantum dot diffusion plate away from the light emitting device; The quantum dot diffusion plate comprises, in sequence along the direction away from the top surface of the supporting part, a substrate, a color conversion film and a brightness enhancement film; The liquid crystal display panel comprises an array substrate, a color film substrate, a liquid crystal layer, a first polarizing sheet and a second polarizing sheet; The array substrate and the color film substrate are arranged in a manner of being opposite to each other; The liquid crystal layer is located between the array substrate and the color film substrate; The first polarizing sheet is located on the side of the array substrate away from the color film substrate; The second polarizer is located on a side of the color film substrate away from the array substrate.

15. A tiled screen, wherein, The spliced screen comprises a plurality of display modules as claimed in any one of claims 10 to 14.

16. A display device comprising: The display device comprises the spliced screen as claimed in claim 15.

Images