Display module, tiled screen, and display device

Abstract

A display module (200), a tiled screen (300), and a display device (40). The display module (200) comprises: a display component (201), a middle frame (202) and an outer frame (203); the display component (201) comprises a display area (201a) and a peripheral area (201b); the middle frame (202) is configured to support the display component (201) in the peripheral area (201b); the outer frame (203) is arranged on the sides of the display component (201) and the middle frame (202) distant from the display area (201a); a diffusion plate (204) is arranged between the display component (201) and the middle frame (202); a buffer structure (205) is arranged between the diffusion plate (204) and the outer frame (203); by means of the buffer structure (205), when the diffusion plate (204) moves under the action of an external force, damage to the diffusion plate (204) caused by direct contact between the diffusion plate (204) and the outer frame (203) can be prevented, thereby ensuring the display effect during the display of the display module (200).

Description

Display module, splicing screen and display device Technical Field

[0001] Embodiments of the present disclosure relate to a display module, a spliced ​​screen, and a display device. Background Art

[0002] As consumers' requirements for display products increase, narrow-border display devices have become a research hotspot. Most narrow-border display devices are backlit liquid crystal display devices, which include a housing, a liquid crystal display panel disposed in the housing, and a backlight module. The liquid crystal display panel includes a color filter substrate, a thin film transistor array substrate (TFT Array Substrate), and a liquid crystal layer (Liquid Crystal Layer) sandwiched between the color filter substrate and the thin film transistor array substrate. The working principle of the liquid crystal display panel is to apply a driving voltage to the color filter substrate and the thin film transistor array substrate to control the rotation of the liquid crystal molecules in the liquid crystal layer, and refract the light from the backlight module for display. Since the liquid crystal display panel itself does not emit light, it needs to rely on the light source provided by the backlight module for normal display.

[0003] Depending on the incident position of the light source, the backlight module is divided into an edge-entry backlight module and a direct-type backlight module. Narrow-frame display devices usually use a direct-type backlight module, and the quality of the direct-type backlight display module will directly affect the picture display effect of the narrow-frame display device. The direct-type backlight module is to place a light source (such as a cathode fluorescent lamp, Cold Cathode Fluorescent Lamp, CCFL) or a light emitting diode (Light Emitting Diode, LED) behind the liquid crystal display panel to directly form a surface light source to provide to the liquid crystal display panel. The direct-type backlight display module includes a direct-type backlight source, a diffuser plate and a plastic frame, and the side of the diffuser plate is mounted on the supporting surface around the plastic frame.

[0004] Summary of the Invention

[0005] The embodiments of the present disclosure relate to a display module, a spliced ​​screen and a display device. The display module sets a buffer structure between the diffuser plate and the outer frame to prevent the diffuser plate from directly contacting the outer frame and causing damage to the diffuser plate when the diffuser plate moves under the action of external force, thereby ensuring the display effect of the display module when displaying.

[0006] At least one embodiment of the present disclosure provides a display module, which includes: a display component, including a display area and a peripheral area; a middle frame, configured to support the display component in the peripheral area; and an outer frame, arranged on a side of the display component and the middle frame away from the display area; wherein a diffusion plate is arranged between the display component and the middle frame, and a buffer structure is arranged between the diffusion plate and the outer frame.

[0007] For example, in the display module provided in at least one embodiment of the present disclosure, the buffer structure includes at least one of a soft white rubber block and a white tape.

[0008] For example, in the display module provided in at least one embodiment of the present disclosure, the middle frame has a first supporting portion for supporting the display component, and the first end of the diffuser plate away from the display area is closer to the display area than the second end of the first supporting portion away from the display area.

[0009] For example, in the display module provided in at least one embodiment of the present disclosure, the buffer structure is a soft white rubber block, and at least a portion of the buffer structure is disposed on the first supporting portion.

[0010] For example, in the display module provided in at least one embodiment of the present disclosure, the buffer structure includes a first portion provided on the first supporting portion and a second portion extending between the middle frame and the outer frame.

[0011] For example, in the display module provided in at least one embodiment of the present disclosure, the middle frame further includes a branch portion extending toward the outer frame, the first portion and the second portion are an integral structure, and the second portion and the branch portion are bonded by adhesive.

[0012] For example, in the display module provided in at least one embodiment of the present disclosure, the entire buffer structure is disposed on the first supporting portion.

[0013] For example, in the display module provided in at least one embodiment of the present disclosure, there is a first gap between the buffer structure and the outer frame, and there is a second gap between the middle frame and the outer frame.

[0014] For example, in the display module provided in at least one embodiment of the present disclosure, a chip-on-chip film is arranged between the diffuser plate and the outer frame, and between the middle frame and the outer frame; one end of the chip-on-chip film is connected to the display component, and the chip-on-chip film is adhered to the outer frame and extends in a direction from the display component to the middle frame.

[0015] For example, in the display module provided in at least one embodiment of the present disclosure, the buffer structure is a white tape, a direction perpendicular to the display surface of the display component is a first direction, and the buffer structure extends along the first direction.

[0016] For example, in the display module provided in at least one embodiment of the present disclosure, the cross-sectional shape of the buffer structure is a broken line, and a chip-on-chip film is provided between the diffuser plate and the outer frame, and between the middle frame and the outer frame; one end of the chip-on-chip film is connected to the display component, and the chip-on-chip film is adhered to the outer frame and extends along the direction from the display component to the middle frame; the buffer structure includes a first sub-buffer structure adhered to the chip-on-chip film, and a second sub-buffer structure adhered to the middle frame.

[0017] For example, in the display module provided in at least one embodiment of the present disclosure, there is a gap between the first sub-buffer structure and the diffuser plate, and there is a gap between the second sub-buffer structure and the chip-on-film.

[0018] For example, the display module provided in at least one embodiment of the present disclosure also includes a back panel, wherein the back panel includes a bottom panel and a side panel, the bottom panel is arranged on a side of the display component away from the middle frame and is arranged opposite to the display component; the side panel is configured to support the middle frame.

[0019] For example, in the display module provided in at least one embodiment of the present disclosure, the display component includes an optical film layer and a display panel stacked in sequence, the optical film layer includes a prism film and a light-enhancing film; the display panel includes an array substrate and a color film substrate arranged relatively to each other, and a liquid crystal layer sandwiched between the array substrate and the color film substrate.

[0020] For example, in the display module provided in at least one embodiment of the present disclosure, the back plate and the middle frame are fixed by snapping or locking, and a reflective film and a light source are provided inside the back plate.

[0021] For example, in the display module provided in at least one embodiment of the present disclosure, the light source is a light emitting diode, and a refractive lens structure or a reflective lens structure is provided on the light emitting side of the light emitting diode.

[0022] For example, in the display module provided in at least one embodiment of the present disclosure, the light source is packaged by a packaging structure to form a packaged chip, the packaged chip is disposed on a substrate, and a light-emitting surface of the packaged chip is provided with fluorescent glue.

[0023] For example, in the display module provided in at least one embodiment of the present disclosure, a plurality of electrodes are provided between the package chip and the base substrate, and gaps are provided between the plurality of electrodes.

[0024] At least one embodiment of the present disclosure further provides a spliced ​​screen, which is formed by splicing a plurality of the display modules provided by any of the above embodiments.

[0025] At least one embodiment of the present disclosure further provides a display device, which includes the spliced ​​screen provided by any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present disclosure, but do not limit the present disclosure.

[0027] FIG1 is a schematic diagram of a cross-sectional structure of a display module;

[0028] FIG2 is a schematic diagram of a display screen when the display module in FIG1 is displaying;

[0029] FIG3 is a schematic cross-sectional view of a display module according to at least one embodiment of the present disclosure;

[0030] FIG4 is a schematic cross-sectional view of the entire display module shown in FIG3 ;

[0031] FIG5 is a schematic cross-sectional view of another display module provided by at least one embodiment of the present disclosure;

[0032] FIG6 is a schematic cross-sectional view of another display module provided by at least one embodiment of the present disclosure;

[0033] FIG7 is a schematic cross-sectional view of another display module provided by at least one embodiment of the present disclosure;

[0034] FIG8 is a schematic cross-sectional view of a display component provided by at least one embodiment of the present disclosure;

[0035] FIG9 is a schematic diagram of the position design of the buffer structure on the middle frame according to an embodiment of the present disclosure;

[0036] 10A and 10B are schematic structural diagrams of a buffer structure at a corner of a middle frame according to an embodiment of the present disclosure;

[0037] 11A and 11B are schematic structural diagrams of the buffer structure at four sides of the middle frame provided by an embodiment of the present disclosure;

[0038] FIG12 is a display screen of a display module;

[0039] FIG13 is a display screen of a display module provided by at least one embodiment of the present disclosure;

[0040] FIG14 is a schematic diagram of a planar structure of a spliced ​​screen provided by at least one embodiment of the present disclosure; and

[0041] FIG15 is a block diagram of a display device provided by at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0043] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by persons of ordinary skill in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0044] Unless otherwise defined, the features such as "parallel", "perpendicular" and "same" used in the embodiments of the present invention include the situations of "parallel", "perpendicular", "same" in a strict sense, as well as the situations of "approximately parallel", "approximately perpendicular", "approximately the same" and the like that contain certain errors. For example, the above-mentioned "approximately" may mean that the difference between the compared objects is 10% of the average value of the compared objects, or within 5%. When the number of a component or element is not specifically indicated below in the embodiments of the present invention, it means that the component or element may be one or more, or may be understood as at least one. "At least one" refers to one or more, and "multiple" refers to at least two. The "same-layer setting" in the embodiments of the present invention refers to the relationship between multiple layers formed by the same material after the same step (for example, a one-step patterning process). The "same layer" here does not always mean that the thickness of multiple layers is the same or the height of multiple layers in the cross-sectional view is the same.

[0045] With the development of display technology, people have higher and higher requirements for the narrow borders and peripheral image quality of splicing screens. The extremely narrow borders of display modules and the peripheral image quality without dark edges have become the ultimate goals of splicing screen architecture. At present, most of the diffusers on the market are made of polystyrene for use in splicing screens with traditional architectures. In order to avoid the phenomenon that the diffuser plate has no space to expand due to heat generated during use of the display device, resulting in poor warping, sufficient expansion space is generally reserved for the diffuser plate when designing the display module, that is, an expansion gap is reserved. The length of the expansion gap is 2 to 4 mm. However, when the display device displays the picture, edge shadows will appear at the expansion gap. The narrower the display device's requirements for the border, the more obvious the edge shadow phenomenon is when the display device displays the picture. Therefore, while pursuing extremely narrow splicing seams for splicing screens, it is also urgent to improve the quality of the peripheral image quality of the splicing screen.

[0046] For example, Figure 1 is a schematic diagram of the cross-sectional structure of a display module. As shown in Figure 1, the display module 100 includes a diffuser plate 101 and a middle frame 103 for supporting a display panel 102. The diffuser plate 101 is fixed to the supporting surface of the middle frame 103 by double-sided tape 104. The middle frame 103 is generally formed of a hard polycarbonate material. Since the middle frame 103 is formed of a hard material, it cannot be compressed. In order to ensure expansion space for the diffuser plate 101, a certain expansion space 105 is reserved between the side wall of the middle frame 103 and the diffuser plate 101. However, due to the propagation direction of light, the location of the expansion space 105 is an area where no light propagates, and the display module 100 will appear dark when displaying images. The problems caused by the thermal expansion of the diffuser plate 101 are mainly limited by the raw materials of the diffuser plate 101 and the size of the expansion space 105. The narrower the requirement for the border of the display module, that is, the smaller the distance between the display area and the outer frame, the larger the distance between the diffuser plate and the display area, the wider the shadow on the display screen, and the more obvious the seam when the display device is displaying.

[0047] For example, Figure 2 is a schematic diagram of the display screen when the display module in Figure 1 is displaying. It can be seen from Figure 2 that a wider edge shadow 107 appears at the edge of the display area 106. This will cause obvious seams to appear when the two display modules are subsequently spliced ​​to form a spliced ​​screen, resulting in poor peripheral image quality when the display device displays the picture, thereby affecting consumers' viewing experience.

[0048] The inventors of the present disclosure have noted that the structure of the display module can be improved, and based on the improved display module, a spliced ​​screen with an extremely narrow seam can be formed. This can also solve the problem of edge shadows caused by the expansion of the diffuser plate in spliced ​​screens with extremely narrow seams. Specifically, a buffer structure is provided between the middle frame and the diffuser plate, that is, between the outer frame and the diffuser plate. While ensuring that the diffuser plate and the liquid crystal display panel are supported and that the diffuser plate has a certain amount of expansion space, the display brightness at the edge of the spliced ​​screen is effectively improved. This can solve the problem of edge shadows caused by the expansion of the diffuser plate in conventional spliced ​​screens with extremely narrow seams, and further effectively improve the poor image quality caused by edge shadows in spliced ​​screens with extremely narrow seams. Because the buffer structure is provided between the outer frame and the diffuser plate, the area of ​​the overlap between the display module and the middle frame is increased when the diffuser plate expands due to heat. When the diffuser plate contracts due to low temperatures, the risk of collapse of the display module due to low temperature contraction is reduced. Furthermore, the design of supporting the ends of the diffuser plate at the ends of the middle frame increases the amount of light incident from the ends of the diffuser plate, reducing the degree of dark frames during display. The design of partially fixing the middle frame around the four sides of the display module can reduce defects in the display module assembly process and improve the efficiency of the display module assembly.

[0049] For example, FIG3 is a schematic diagram of the cross-sectional structure of a display module provided in at least one embodiment of the present disclosure. As shown in FIG3 , the display module 200 includes: a display component 201, a middle frame 202, and an outer frame 203. The display component 201 includes a display area 201a and a peripheral area 201b. The display area 201a is an area for displaying images, and the peripheral area 201b is a non-display area surrounding the display area 201a. The middle frame 202 is configured to support the display component 201 in the peripheral area 201b. The outer frame 203 is provided on a side of the display component 201 and the middle frame 202 away from the display area 201a, and a diffuser plate 204 is provided between the display component 201 and the middle frame 202, and a buffer structure 205 is provided between the diffuser plate 204 and the outer frame 203. The display module 200 provides a buffer structure 205 on the outer side of the middle frame 203. On the premise of ensuring that the middle frame 203 supports the diffuser plate 204 and the display component 201 and that the diffuser plate 204 has sufficient expansion space, the brightness of the edges of the spliced ​​screen formed by multiple display modules 200 is effectively improved during display. This solves the problem that the spliced ​​screen with extremely narrow seams has dark shadows at the edges due to the expansion restriction of the diffuser plate. In the structure of the display module 200 shown in Figure 3, the end of the middle frame is designed to support the end of the diffuser plate, which increases the amount of light incident from the end of the diffuser plate and reduces the degree of dark frames when displaying the picture. The middle frame is locally fixed around the display module, which can improve the assembly efficiency of the display module.

[0050] For example, as shown in FIG3 , the buffer structure 205 includes at least one of a soft white rubber block and a white tape. For example, in one example, the buffer structure 205 is a soft white rubber block, and its hardness is Shore 30 to 80. For example, the soft white rubber block provided in the embodiment of the present disclosure is a vulcanized rubber, which has a low sulfur content and has good elasticity, flexibility, tensile strength, compressibility, wear resistance, aging resistance, high pressure resistance, scratch resistance and antistatic properties, and can withstand high-load working environments. In addition, setting the buffer structure 205 to white can reduce the obstruction of light. For example, in another example, the buffer structure 205 is a white tape, which can reduce the occupied area of ​​space and can be connected to different positions and different components.

[0051] For example, as shown in Figure 3, the middle frame 202 has a first supporting portion 2021 for supporting the display component 201, and the first end 2041 of the diffuser 204 away from the display area 201a is closer to the display area 201a than the second end 2021a of the first supporting portion 2021 away from the display area 201a, that is, in the direction from the display area 201a to the peripheral area 201b, there is a certain distance between the first end 2041 and the second end 2021a, so as to ensure that light can pass through the gap between the diffuser 204 and the second end 2021a of the first supporting portion 2021, and when the diffuser 204 expands due to heat, it can slide a certain distance on the first supporting portion 2021 to increase the overlapping area between the diffuser 204 and the middle frame 202, so that the diffuser 204 can be more firmly formed on the middle frame 202.

[0052] For example, as shown in FIG3 , the buffer structure 205 is a soft white rubber block. At least a portion of the buffer structure 205 is disposed on the first support portion 2021 , and a gap is provided between the buffer structure 205 and the first end portion 2041 of the diffuser plate 204 away from the display area 201 a. This ensures that light can pass through the gap while also ensuring that the diffuser plate 204 has a certain amount of expansion space when it expands due to heat.

[0053] For example, as shown in FIG3 , the buffer structure 205 includes a first portion 2051 disposed on the first support portion 2021 and a second portion 2052 extending between the middle frame 202 and the outer frame 203. The first portion 2051 and the second portion 2052 are integrally formed. The middle frame 203 also includes a branch extending toward the outer frame 203, thereby giving the middle frame 202 a stepped shape. The first portion 2051 of the buffer structure 205 is disposed on the middle frame 202, and the second portion 2052 of the buffer structure 205 is disposed on the branch of the middle frame 202. That is, the mating surfaces of the buffer structure 205 and the middle frame 202 are engaged with the stepped middle frame 202, thereby enabling the buffer structure 205 to be stably formed on the middle frame 202.

[0054] For example, as shown in FIG3 , the second portion 2052 of the buffer structure 205 is bonded to the stepped side surface by adhesive, and the first portion 2051 of the buffer structure 205 can be directly formed on the first support portion 2021 or bonded to the first support portion 2021 by adhesive. For example, the adhesive is a pressure-sensitive adhesive, a hot melt adhesive, or a UV-curable adhesive.

[0055] For example, as shown in FIG3 , the diffuser plate 204 and the middle frame 202 are bonded together by adhesive 208 in the form of a frame bond. The frame bond is formed by bonding adhesive 208 around the diffuser plate 204 and around the middle frame 202 .

[0056] For example, as shown in FIG3 , the middle frame 202 is an aluminum extrusion profile. The aluminum extrusion profile has a relatively flat surface, thereby enabling the middle frame 202 to have a flat surface. It should be understood that in other exemplary embodiments, the middle frame 202 may also be a plastic frame.

[0057] For example, when the middle frame 202 is made of aluminum, it can be formed by extrusion molding. When the middle frame 202 is made of plastic, it can be formed by injection molding. The main function of the middle frame 202 is to support the display panel, and the surface of the middle frame 202 used to support the display panel can also be used as a glue coating surface.

[0058] For example, as shown in Figure 3, the buffer structure 205 is adjacent to the outer frame 203 and the middle frame 202. A first gap d1 is provided between the buffer structure 205 and the outer frame 203, and a second gap d2 is provided between the middle frame 202 and the outer frame 203. The first gap d1 and the second gap d2 provide the buffer structure 205 with sufficient space for expansion.

[0059] For example, as shown in FIG3 , a chip-on-film (COF) 206 is provided between the diffuser 204 and the outer frame 203, and between the middle frame 202 and the outer frame 203. One end of the COF 206 is connected to the display component 201, and the COF 206 adheres to the outer frame 203 and extends in the direction from the display component 201 to the middle frame 202. The COF is a soft film structure that fixes the integrated circuit (IC) to the flexible circuit board. The COF includes a film body, a gate driver chip and a source driver chip integrated on the film body, and bonding wires. The bonding wires respectively bond and connect the gate leads of the gate driver chip and the source leads of the source driver chip to the signal traces.

[0060] It should be noted that, in the spliced ​​screen provided in the embodiments of the present disclosure, element A and element B are adjacent, or adjacent elements A and element B means that there are no other elements A and other elements B between element A and element B, but there may be other elements besides element A and element B. Element A and element B may be the same element or different elements.

[0061] For example, FIG4 is a schematic diagram of the cross-sectional structure of the entire display module shown in FIG3. As shown in FIG4, except for the chip-on-film 206 provided on the left side and the difference in the structure of part of the middle frame, the left and right parts of the display module are basically symmetrical structures.

[0062] For example, as shown in Figure 4, the display module 200 also includes a back panel 209, which includes a bottom panel 2091 and a side panel 2092. The bottom panel 2091 is arranged on a side of the display component 201 away from the middle frame 202 and is arranged opposite to the display component 201. The side panel 2092 is configured to support the middle frame 202.

[0063] For example, as shown in FIG4 , the back panel 209 and the middle frame 202 are fixed by snapping or locking, that is, the back panel 209 and the middle frame 202 are detachably connected, so that the back panel 209 and the middle frame 202 can have more sufficient space to accommodate the reflective film, the diffuser plate, the optical film layer and the display panel when assembled, and the above structure can also be more flexibly adjusted during the installation process.

[0064] For example, as shown in FIG4 , a reflective film 211 and a light source 212 are provided inside the back plate 209, that is, the reflective film 211 and the light source 212 are provided on the bottom plate 2091, and the reflective film 211 is provided between the bottom plate 2091 and the light source 212. The reflective film 211 can perform a light-homogenizing effect on the light emitted from the light source 203. The reflective film 211 can make full use of the light emitted from the light source 212. The material of the back plate 209 is an electro-galvanized steel plate or a hot-dip galvanized steel plate. The main function of the back plate 209 is to fix the light source 212, the middle frame 202 and other structures, thereby supporting the entire display module 200.

[0065] For example, as shown in Figure 4, the light source 212 can provide a backlight source for the display of the display panel 2012. The light source 212 is a light emitting diode, and a refractive lens structure or a reflective lens structure is provided on the light emitting side of the light emitting diode. In one example, in order to obtain excellent emission efficiency and excellent luminous brightness, the light source 212 includes a blue light emitting diode (LED) or a blue Mini-LED. The blue light emitting diode has a blue light emitting diode chip and a yellow fluorescent material, and the yellow fluorescent material is, for example, yttrium aluminum garnet (YAG:Ce) doped with cerium. The blue light emitted from the blue light emitting diode chip passes through the yellow fluorescent material and is mixed with the yellow light emitted from the yellow fluorescent material, so that the backlight source can finally emit white light.

[0066] For example, in one embodiment, the light source 212 is encapsulated by the encapsulation structure to form a packaged chip, which is disposed on a substrate. A fluorescent adhesive is disposed on the light-emitting surface of the packaged chip. The fluorescent adhesive can enhance the purity of the emitted light. For example, fluorescent adhesive is disposed on both the left and right sides of the packaged chip. The packaged chip is a light-emitting diode that emits blue light, and the fluorescent adhesive is yellow fluorescent adhesive. Thus, the blue light emitted by the blue light-emitting diode is converted into white light after passing through the yellow fluorescent adhesive.

[0067] For example, the fluorescent adhesive may include a phosphor material or a quantum dot fluorescent layer. Phosphor materials can improve luminous efficiency, precisely control the wavelength of light emitted by the packaged chip, and soften the light emitted by the packaged chip. Quantum dot materials offer a narrow luminous spectrum, a wide color gamut, excellent stability, long life, and low production cost.

[0068] For example, in one example, multiple electrodes can be set between the packaged chip and the substrate, and there are gaps between the multiple electrodes. This can help the heat generated by the packaged chip to dissipate from the gaps to reduce the temperature of the packaged chip, thereby having advantages in high current driving and high temperature resistance.

[0069] For example, by coating the side surfaces of the LED with a fluorescent layer and coating the light-emitting surface of the LED with a light-shielding layer, a chip-scale packaged LED (packaged chip) is formed that emits light only from the side surfaces. That is, the packaged chip is a chip-scale packaged LED (CSP LED) that emits light on all four sides (except for the top and bottom surfaces, all other surfaces emit light). The definition of a chip-scale packaged device refers to a fully functional packaged device with a ratio of the package size to the chip size of no more than 1.2 times. A CSP LED is a light-emitting diode that uses the CSP packaging process. The structure of a chip-scale packaged LED is to evenly wrap the chip with fluorescent glue, and then mount the chip-scale packaged device on a substrate.

[0070] For example, the fluorescent layer is coated on the side of the packaged chip, and its thickness is 0 to 400 μm, which can be adjusted according to the application scenario. For example, there is no gap between the fluorescent layer and the packaged chip, so as to ensure that the emitted light does not have the problem of uneven emission, thereby improving the product yield. The light-shielding layer is used to block the light emitted from the light-emitting surface of the packaged chip, and the light-shielding layer covers the packaged chip and the fluorescent layer, and is consistent with the edge of the fluorescent layer. For example, the thickness of the light-shielding layer is 10 to 500 μm, and there must be no gap, otherwise light leakage will occur.

[0071] For example, the light-shielding layer can be made of white glue, silicone, or epoxy resin. White glue offers excellent film-forming properties, high bonding strength, fast curing, non-toxicity, and low cost. Silicone offers high tensile strength, high transparency, non-toxicity, and a long lifespan. Epoxy resin offers excellent insulation, thermal conductivity, high and low temperature resistance, good sealing, and a simple filling process.

[0072] For example, the packaged chip includes at least one of a blue LED chip, a red LED chip, a green LED chip, and a white LED chip. Different chips can be selected based on the application scenario and actual light output requirements. When white light is required, the blue LED chip, the red LED chip, and the green LED chip can respectively emit blue light, red light, and green light to form white light, or the white LED chip can be used directly to emit white light.

[0073] For example, since the top of the chip-level packaged light-emitting diode does not emit light, there is no problem of uneven light emission between the top and the side. This can solve the problem that display products such as televisions, computer monitors or mobile phones are prone to light mixing difficulties when the light mixing distance is small, that is, it improves the light mixing effect and helps to improve the display effect of display products.

[0074] For example, as shown in Figure 4, the buffer structure 205 on the side (left side) where the chip-on-film is provided can be glued and fixed to the periphery of the middle frame 202 by double-sided tape, and the buffer structure 205 and the diffuser plate 204 are designed in an interference fit manner to ensure that the diffuser plate 204 is in full contact with the buffer structure 205 after being placed; then the buffer structure 205 on the side (right side) where the chip-on-film is not provided is glued and fixed to the periphery of the middle frame 202.

[0075] For example, Figure 5 is a schematic diagram of the cross-sectional structure of another display module provided by at least one embodiment of the present disclosure. The difference between the display module shown in Figure 5 and the display module shown in Figure 3 is that the buffer structure 205 is in direct contact with the first end 2041 of the diffuser 204 away from the display area 201a, and the buffer structure 205 is also in direct contact with the outer frame 203, that is, the buffer structure 205 fills the gap between the diffuser 204 and the outer frame 203, as well as the gap between the middle frame 203 and the outer frame 203, so that the buffer structure 205 can be stably formed between the diffuser 204 and the outer frame 203, as well as between the middle frame 202 and the outer frame 203, and the buffer structure 205 is compressed to provide space for the diffuser 204 to expand when heated.

[0076] For example, in the structure shown in Figure 5, the part of the middle frame 203 used to support the buffer structure 204 is extended toward one side of the outer frame 203, which is conducive to fixing the buffer structure 204 and avoiding the poor display image caused by excessive squeezing of the buffer structure 204 by the outer frame 203.

[0077] For example, as shown in FIG5 , the end of the diffuser plate 204 near the outer frame 203 lacks a middle frame support portion. After the diffuser plate 204 moves outward, the area of ​​the overlap between the diffuser plate 204 and the middle frame 202 increases. The larger the overlap, the more obvious the dark frame phenomenon becomes. The middle frame 202 uses a local support design to support the diffuser plate 204. The length of the portion of the middle frame 202 supporting the diffuser plate 204 is less than or equal to 1 mm. The portion of the middle frame 202 not supporting the diffuser plate 204 is beveled. A larger bevel angle α results in less dark frame. When the bevel angle α is ≥ 50°, the dark frame phenomenon is essentially invisible. If the width of the middle frame supporting the diffuser plate 204 is sufficiently large, the bevel angle α can be increased as much as possible.

[0078] For example, FIG6 is a schematic cross-sectional view of another display module provided in at least one embodiment of the present disclosure. As shown in FIG6 , the first end 2041 of the diffuser plate 204, which is away from the display area 201a, is closer to the display area 201a than the second end 2021a of the first support portion 2021, which is away from the display area 201a. That is, there is a certain distance between the first end 2041 and the second end 2021a in the direction from the display area 201a to the peripheral area 201b. The buffer structure 205 is entirely disposed on the first support portion 2021. The buffer structure 205 and the first end 2041 of the diffuser plate 204, which is away from the display area, are connected by adhesive. The side of the buffer structure 205 away from the display area 201a is aligned with the side of the second end 2021a away from the display area 201a. The cross-sectional shape of the buffer structure 205 is rectangular, which makes the buffer structure 205 easy to form, thereby reducing production costs.

[0079] For example, Figure 7 is a schematic cross-sectional view of another display module provided in at least one embodiment of the present disclosure. The display module shown in Figure 7 differs from the display module shown in Figure 3 in that the buffer structure 205 in Figure 7 is a white tape. The direction perpendicular to the display surface of the display component 201 is a first direction X. The buffer structure 205 extends along the first direction X, and the direction from the display area 201a to the peripheral area 201b is a second direction Y. For example, the white tape can extend linearly or in a curved manner along the first direction X. Figure 7 uses the curved extension of the white tape along the first direction X as an example for illustration.

[0080] For example, FIG7 also shows a chip-on-film (COF) 206. The cross-section of the buffer structure 205 is in the shape of a broken line. The COF 206 is disposed between the diffuser plate 204 and the outer frame 203, and between the middle frame 202 and the outer frame 203. One end of the COF 206 is connected to the display component 202, and the COF 206 adheres to the outer frame 203 and extends in a direction from the display component 201 to the middle frame 202, that is, along the first direction X. The buffer structure 205 includes a first sub-buffer structure 2051 adhered to the COF 206, and a second sub-buffer structure 2052 adhered to the middle frame 202. That is, one end of the buffer structure 205 is connected to the COF 206, and the other end is connected to the middle frame 202.

[0081] For example, as shown in FIG7 , there is a gap between the first sub-buffer structure 2051 and the diffuser plate 204 , and there is a gap between the second sub-buffer structure 2052 and the chip-on-film 206 , thereby ensuring that the buffer structure 205 is stably arranged while ensuring that the diffuser plate 204 has a certain expansion space.

[0082] For example, in conjunction with Figures 3 to 7, the display component 201 includes an optical film layer 2011 and a display panel 2012, which are stacked in sequence. The optical film layer 2011 includes a prism film 2011a and a brightness enhancement film 2011b. For example, the prism film 2011a and the brightness enhancement film 2011b can be stacked in sequence on a transparent substrate. The transparent substrate needs to have a certain strength and resistance to thermal expansion and contraction. For example, the transparent substrate can be a glass substrate. The brightness enhancement film 2011b can improve the display brightness of the display module and ensure the uniformity of the brightness of the display module as a whole. The prism film 2011a can deflect light. It should be understood that in other exemplary embodiments, the optical film layer 2011 can also have other structures. For example, the stacking order of the brightness enhancement film 2011b and the prism film 2011a is changed, and the brightness enhancement film 2011b and the prism film 2011a are stacked in sequence on the transparent substrate, or, in one example, the optical film layer 2011 may also include a diffusion film, which all fall within the scope of protection of the embodiments of the present disclosure.

[0083] It should be noted that the prism film 2011a is an optical film material having a peak-shaped structure on its surface. The peak-shaped structure has a light-converging effect, thereby improving the brightness of the display module when viewed at a normal angle.

[0084] For example, in one example, the prism film 2011a may include upper prisms and lower prisms to improve the front view brightness or axial brightness of the display module. The upper prisms and lower prisms may refer to conventional designs, and the embodiments of the present disclosure are not limited to this.

[0085] For example, FIG8 is a schematic cross-sectional view of a display component provided by at least one embodiment of the present disclosure. As shown in FIG8 , the display panel 2012 includes an array substrate 2012a and a color filter substrate 2012b disposed opposite each other, and a liquid crystal layer 2012c sandwiched between the array substrate 2012a and the color filter substrate 2012b. For example, in the display panel 2012, the array substrate is provided with a plurality of gate lines and a plurality of data lines. The plurality of gate lines and the plurality of data lines define a plurality of pixel units. Each pixel unit is provided with a thin film transistor and a pixel electrode. The gate of the thin film transistor is electrically connected to the gate line, the source is electrically connected to the data line, and the drain is electrically connected to the pixel electrode. The color filter substrate includes a grid-shaped black matrix and a plurality of color resists arranged in an array within the openings of the black matrix. The color resists include red, green, and blue color resists. The deflection of the liquid crystal molecules is controlled by the electric field between the pixel electrode and the common electrode, thereby achieving a display effect. For example, other structures included in the display panel 2012 can refer to conventional designs and are not further described here.

[0086] For example, in one embodiment, in Figures 3 to 7, a light-shielding tape 207 is provided between the display component 201 and the outer frame 203. The light-shielding tape 207 is configured to secure the display panel 2012 so that the display panel 2012 can maintain a stable state. For example, the light-shielding tape 207 can be a UV-curable adhesive, a hot-melt adhesive, a combination of UV-curable adhesive and hot-melt adhesive, or a double-sided tape. The embodiments of the present disclosure are not limited to this, as long as it can achieve the purpose of securing the display panel 2012.

[0087] For example, as shown in Figures 3 to 7, the material of the light-shielding tape 207 is a black condensation product of terephthalic acid and ethylene glycol. The main function of the light-shielding tape 207 is to block the edge of the display panel 2012 and the light leaking from the backlight module to prevent light leakage from the backlight module.

[0088] For example, other structures in the display module 200 can refer to the relevant description of the conventional display module, which will not be repeated here.

[0089] For example, Figure 9 shows a schematic diagram of the design of the buffer structure's placement on the midframe, according to one embodiment of the present disclosure. If the buffer structure were a single, integrated design, assembly of the display module would be difficult, or misalignment between the display module and the buffer structure would be a problem. As shown in Figure 9, considering the ease of display module assembly, the buffer structure is designed locally on the midframe, with one located at each of the four corners (c) and four edges (d). This balances ease of display module assembly with secure retention of the buffer structure.

[0090] For example, Figures 10A and 10B are schematic structural diagrams of the buffer structure provided at the corner of the middle frame according to an embodiment of the present disclosure. As shown in Figures 10A and 10B, the corner of the middle frame is made into a right-angle notch, and the buffer structure is pasted and fixed to the middle frame in a wrap-around manner. The thickness of the buffer structure exceeds the side wall of the middle frame by about 1 mm.

[0091] For example, Figures 11A and 11B are schematic structural diagrams of the buffer structure provided by an embodiment of the present disclosure at the four sides of the middle frame. As shown in Figures 11A and 11B, the four sides of the middle frame 202 are made into T-shaped notches, and the buffer structure 204 is glued and fixed to the side wall of the middle frame. The thickness of the buffer structure is designed to be interference fit, exceeding the side wall of the plastic frame by about 1 mm.

[0092] For example, Figure 12 shows a display screen of a display module, and Figure 13 shows a display screen of a display module provided by at least one embodiment of the present disclosure. As shown in Figure 12, it can be clearly seen that there is a dark frame around the perimeter of the screen displayed by the display module, and the edge image quality uniformity of the display screen of the display module is poor, with a noticeable dark frame edge at the border of the display screen. As shown in Figure 13, there is no noticeable dark frame around the perimeter of the display screen of the display module, and the edge image quality of the display screen of the display module is uniform, with the distribution density of scattered points in various locations in the display screen being the same. In other words, the design of the solutions of some embodiments of the present disclosure improves the phenomenon of poor edge image quality uniformity of the spliced ​​screen display screen.

[0093] At least one embodiment of the present disclosure provides a spliced ​​screen. For example, FIG14 is a schematic planar structural diagram of a spliced ​​screen provided by at least one embodiment of the present disclosure. As shown in FIG14 , the spliced ​​screen 300 includes a plurality of display modules 200 connected in sequence. Although FIG14 shows that the spliced ​​screen 300 includes 9 display modules 200 spliced ​​together, the embodiments of the present disclosure are not limited thereto and may also include other numbers of display modules 200, for example, 2, 4, 6, 12, etc. The plurality of display modules 200 are spliced ​​together, and a seam is provided between any two adjacent display modules 200. In some examples, the display module 200 may be a liquid crystal display module, an organic light emitting diode (OLED) display module, or an electrophoretic display module. In the following embodiments, the display module 200 is described as a liquid crystal display module.

[0094] At least one embodiment of the present disclosure further provides a display device. For example, FIG15 is a block diagram of a display device according to at least one embodiment of the present disclosure. As shown in FIG15 , the display device 40 includes a plurality of spliced ​​screens 300 according to any of the aforementioned embodiments, each of which is formed by splicing together a plurality of display modules 200. The display device in the embodiments of the present disclosure can be any product or component with a display function, such as a monitor, an OLED panel, an OLED TV, electronic paper, a mobile phone, a tablet computer, a laptop computer, a digital photo frame, or a navigation system.

[0095] The display module, spliced ​​screen and display device provided by at least one embodiment of the present disclosure have at least the following beneficial technical effects: by arranging a diffusion plate between the display component and the middle frame, and arranging a buffer structure between the diffusion plate and the outer frame, it is possible to prevent the diffusion plate from directly contacting the outer frame and causing damage to the diffusion plate when the diffusion plate moves under the action of external force, thereby protecting the diffusion plate and ensuring the display effect when the display module is displaying.

[0096] There are a few points to note:

[0097] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0098] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale.

[0099] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0100] The above description is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure shall be based on the protection scope of the claims.

Claims

1. A display module, comprising: Display component, including a display area and a peripheral area; a middle frame, configured to support the display component in the peripheral area; The outer frame is arranged on a side of the display component and the middle frame away from the display area; wherein, A diffusion plate is provided between the display component and the middle frame, and a buffer structure is provided between the diffusion plate and the outer frame.

2. The display module according to claim 1, wherein: The buffer structure includes at least one of a soft white rubber block and a white tape.

3. The display module according to claim 2, wherein: The middle frame includes a first supporting portion for supporting the display component, and a first end portion of the diffusion plate away from the display area is closer to the display area than a second end portion of the first supporting portion away from the display area.

4. The display module according to claim 3, wherein: The buffer structure is a soft white rubber block, and at least a portion of the buffer structure is arranged on the first supporting portion.

5. The display module according to claim 4, wherein: The buffer structure includes a first portion provided on the first support portion and a second portion extending between the middle frame and the outer frame.

6. The display module according to claim 5, wherein: The middle frame further includes a branch portion extending toward the outer frame. The first portion and the second portion are an integral structure, and the second portion and the branch portion are bonded together by adhesive.

7. The display module according to claim 4, wherein: The entirety of the buffer structure is disposed on the first supporting portion.

8. The display module according to claim 7, wherein: A first gap is formed between the buffer structure and the outer frame, and a second gap is formed between the middle frame and the outer frame.

9. The display module according to claim 7 or 8, wherein: A chip-on-film is provided between the diffuser plate and the outer frame, and between the middle frame and the outer frame; One end of the chip-on-film is connected to the display component, and the chip-on-film adheres to the outer frame and extends along a direction from the display component to the middle frame.

10. The display module according to claim 3, wherein: The buffer structure is a white tape, a direction perpendicular to the display surface of the display component is a first direction, and the buffer structure extends along the first direction.

11. The display module according to claim 9, wherein: The cross-section of the buffer structure is in the shape of a broken line, and a chip-on-film is provided between the diffuser plate and the outer frame, and between the middle frame and the outer frame; One end of the chip-on-film is connected to the display component, and the chip-on-film is attached to the outer frame and extends along the direction from the display component to the middle frame; The buffer structure includes a first sub-buffer structure attached to the chip-on-film and a second sub-buffer structure attached to the middle frame.

12. The display module according to claim 11, wherein: There is a gap between the first sub-buffer structure and the diffusion plate, and there is a gap between the second sub-buffer structure and the chip-on-film.

13. The display module according to any one of claims 1 to 12, further comprising a back plate, wherein: The back plate includes a bottom plate and a side plate. The bottom plate is arranged on a side of the display component away from the middle frame and is arranged opposite to the display component. The side plate is configured to support the middle frame.

14. The display module according to claim 13, wherein: The display component includes an optical film layer and a display panel stacked in sequence, the optical film layer includes a prism film and a brightness enhancement film; the display panel includes an array substrate and a color filter substrate arranged opposite to each other, and a liquid crystal layer sandwiched between the array substrate and the color filter substrate.

15. The display module according to claim 13, wherein: The back plate is fixed to the middle frame by snapping or locking, and a reflective film and a light source are arranged inside the back plate.

16. The display module according to claim 15, wherein: The light source is a light emitting diode, and a refractive lens structure or a reflective lens structure is provided on the light emitting side of the light emitting diode.

17. The display module according to claim 16, wherein: The light source is packaged by a packaging structure to form a packaged chip. The packaged chip is arranged on a substrate. A light emitting surface of the packaged chip is provided with fluorescent glue.

18. The display module according to claim 17, wherein: A plurality of electrodes are provided between the package chip and the substrate, and gaps are provided between the plurality of electrodes.

19. A spliced ​​screen formed by splicing a plurality of display modules according to any one of claims 1 to 18.

20. A display device comprising the spliced ​​screen according to claim 19.

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