Backlight device, display panel and display device

Abstract

The invention discloses a backlight device, a display panel and a display device. The device comprises a light source, a back plate, a reflecting film and a light guide plate, the back plate comprises a concave structure, the reflecting film is fixed to the bottom of the concave structure through first colloid, the light guide plate is connected with the back plate through second colloid, the light guide plate is arranged on the side, away from the back plate, of the reflecting film, and the light source is fixed to the side of the concave structure. The projection area of the reflecting film at the bottom is smaller than that of the light guide plate at the bottom, and the second colloid is located at the bottom except the projection area of the reflecting film. By adopting the device, the vibration intensity of the light guide plate can be reduced, the inertia acting force between the light guide plate and the reflecting film is reduced, white spots and other defects of the backlight device are avoided, and the quality of the backlight device is ensured.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to a backlight device, a display panel and a display device. Background Art

[0002] The backlight device is usually composed of light source, middle iron frame, light guide plate, optical film material, back plate and other components. The optical film material includes reflective film, diffusion film, prism sheet and the like. Among them, the reflective film is fixed to one side of the back plate by adhesive material, and the light guide plate is fixed to the side of the reflective film away from the back plate by adhesive material; the middle iron frame is fixedly connected to the back plate to fix the optical film material, light guide plate and other components. The backlight device is often used in display devices such as vehicle-mounted display screens and LCDs to provide backlight sources for the display devices.

[0003] In the three-comprehensive vibration test and in harsh environments, the backlight device will vibrate, causing the reflective film to vibrate relative to the back plate and the light guide plate to vibrate relative to the reflective film, resulting in a large vibration amplitude of the light guide plate. Since the light guide plate has a large mass, the inertial force generated by its vibration and acting on the reflective film is large, which can easily cause friction damage between the light guide plate and the reflective film, causing deformation and warping of the middle iron frame, affecting the quality of the backlight device. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a backlight device, a display panel and a display device that can reduce the vibration intensity of the light guide plate, reduce the inertial force between the light guide plate and the reflective film, avoid white spots and other defects of the backlight device, and ensure the quality of the backlight device.

[0005] In a first aspect, the present application provides a backlight device. The backlight device includes a light source, a back plate, a reflective film, and a light guide plate, the back plate includes a recessed structure, the reflective film is fixed to the bottom of the recessed structure by a first colloid, the light guide plate is connected to the back plate by a second colloid, the light guide plate is arranged on a side of the reflective film away from the back plate, the light source is fixed to the side of the recessed structure, the projection area of ​​the reflective film at the bottom is smaller than the projection area of ​​the light guide plate at the bottom, and the second colloid is located in the area of ​​the bottom except the projection area of ​​the reflective film.

[0006] In combination with the first aspect, in a possible implementation, in a first direction, the length of the reflective film is smaller than the length of the light guide plate; wherein the light guide plate has a light incident side on a side close to the light source, and has a light emitting side opposite to the light incident side, and the first direction is the direction from the light incident side to the light emitting side.

[0007] In combination with the first aspect, in a possible implementation manner, the second colloid is disposed on the light emitting side and / or the light incident side of the light guide plate.

[0008] In combination with the first aspect, in a possible implementation manner, in the first direction, a size of the second colloid disposed on the light emitting side is greater than or equal to a size of the second colloid disposed on the light incident side.

[0009] In combination with the first aspect, in a possible implementation manner, in the first direction, there is a gap between the second colloid and the reflective film.

[0010] In combination with the first aspect, in a possible implementation, the gap width between the second colloid disposed on the light incident side and the reflective film is less than or equal to 0.2 mm, and the gap width between the second colloid disposed on the light exit side and the reflective film is less than or equal to 0.5 mm.

[0011] In combination with the first aspect, in a possible implementation manner, the thickness of the second colloid is greater than the first spacing, and the first spacing is the distance between the light guide plate and the back plate.

[0012] In combination with the first aspect, in a possible implementation manner, a difference between a thickness of the second colloid and the first spacing is in a range of 0.1-0.15 mm.

[0013] In combination with the first aspect, in a possible implementation, the backlight device also includes a limiting structure, the limiting structure includes a limiting frame and at least one connecting member arranged at the edge of the limiting frame, the end face of the side of the back plate is provided with a groove, when the connecting member is placed in the groove, the limiting structure is connected to the back plate, the connecting member includes a connecting member body and an extension portion extending in a second direction, the shape of the groove matches the shape of the connecting member, the groove includes a main body area and an extension area extending in the second direction, there is a gap between the extension area and the end face; the second direction is the extension direction of the edge of the limiting frame where the connecting member is located.

[0014] In combination with the first aspect, in a possible implementation manner, the backlight device further includes a third colloid, and when the connecting member is adhered in the groove through the third colloid, the limiting structure is connected to the back plate.

[0015] In combination with the first aspect, in a possible implementation manner, the shape of the connecting piece is at least one of a T-shape and a trapezoidal shape.

[0016] In combination with the first aspect, in a possible implementation, when the connector is placed in the groove, the first surface of the connector is located between the end surface and the bottom surface of the groove; the first surface of the connector is the surface of the connector away from the bottom surface of the groove.

[0017] In a second aspect, the present application further provides a display panel, which includes the backlight device as described in the first aspect.

[0018] In a third aspect, the present application further provides a display device, which includes the display panel as described in the second aspect.

[0019] The embodiment of the present application provides a backlight device, a display panel and a display device, wherein the backlight device includes a light source, a back plate, a reflective film and a light guide plate, wherein the back plate includes a recessed structure, the reflective film is fixed to the bottom of the recessed structure by a first colloid, the light guide plate is connected to the back plate by a second colloid, the light guide plate is arranged on the side of the reflective film away from the back plate, and the light source is fixed to the side of the recessed structure. The embodiment of the present application reserves an area other than the projection area corresponding to the reflective film in the projection area corresponding to the light guide plate, i.e., a reserved position for the second colloid, so that the light guide plate can be directly connected to the back plate through the second colloid, avoiding the light guide plate being fixed to the back plate as an intermediate component through the reflective film, so that the light guide plate can be connected to the stable back plate, and in the case of vibration, the influence of the unstable factor of the reflective film that also vibrates is avoided, thereby effectively reducing the vibration intensity of the light guide plate, reducing the inertial force between the light guide plate and the reflective film, avoiding defects such as white spots of the backlight device, and ensuring the quality of the backlight device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 It is a structural schematic diagram of a backlight device in the prior art; Figure 2 is another structural schematic diagram of a backlight device in the prior art; Figure 3 is a schematic structural diagram of a backlight device in one embodiment; Figure 4-6 is a schematic diagram of the positional relationship between the reflective film and the projection area of ​​the light guide plate in one embodiment; Figure 7-9 is a schematic diagram of the positional relationship between the second colloid, the reflective film and the projection area of ​​the light guide plate in one embodiment; Fig.10 is another structural schematic diagram of a backlight device in one embodiment; Fig.11 A schematic diagram of parameter markings of a backlight device in one embodiment; Fig.12 A schematic diagram of the connection between the limiting structure and the back plate in one embodiment; Fig.13 A cross-sectional view of the connection between the limiting structure and the back plate in one embodiment; Fig.14 It is a schematic diagram of the connection between the limiting structure and the back plate in the prior art; Fig.15 It is a cross-sectional view of the connection between the limiting structure and the back plate in the prior art; Fig.16 A schematic diagram of another shape of a connecting member and a groove in one embodiment; Fig.17 is a parameter marking diagram of a connecting member in one embodiment; Fig.18 FIG. 4 is a distribution diagram of the connecting parts on the limiting frame in one embodiment.

[0021] Description of reference numerals: 10-light source, 11-first colloid, 12-second colloid, 13-third colloid, 20 back plate, 21-bottom of the recessed structure, 22-side of the recessed structure, 23-groove, 231-main area, 232-extension area, 30-reflective film, 40-light guide plate, 50-limiting structure, 51-limiting frame, 52-connecting part, 521-connecting part body, 522-extension part. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the inventions. It should also be noted that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. In addition, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0029] like Figure 1 and Figure 2 As shown, the backlight device is usually composed of a light source (Back Light Unit, BLU), a middle iron frame (ModelFrame, MF), a light guide plate (Light Guide Plate, LGP), an optical film material, a back cover (Back Cover, BC) and other components. The optical film material includes a reflective film (Reflector), a diffusion film, a prism sheet and other layers. Among them, the reflective film is fixed to one side of the back plate by a glue material (DoubleStick Tape, DST1), and the light guide plate is fixed to the side of the reflective film away from the back plate by a glue material DST2; the middle iron frame is connected to the back plate to fix the optical film material, light guide plate and other components. Among them, Figure 2 for Figure 1 AA' cross-sectional view of the backlight device.

[0030] Backlight devices are often used in display devices such as vehicle-mounted display screens and LCDs to provide backlight sources for the display devices.

[0031] In the three-comprehensive vibration test, harsh environment and other conditions, the backlight device will vibrate, causing the reflective film to vibrate relative to the back plate, and the light guide plate to vibrate relative to the reflective film, resulting in a larger vibration amplitude of the light guide plate. Since the light guide plate has a large mass, its vibration generates a large inertial force acting on the reflective film, which can easily cause friction damage between the light guide plate and the reflective film. In particular, as users' demand for large-size display panels increases, the size of the backlight device increases, that is, the size and mass of the light guide plate increase, making the friction damage between the light guide plate and the reflective film more serious, which can easily lead to defects such as white spots on the backlight device. In addition, vibration can also cause deformation and warping of the middle iron frame, which also affects the quality of the backlight device.

[0032] Based on this, the embodiment of the present application provides a backlight device, such as Figure 3 As shown, the device includes a light source 10, a back panel 20, a reflective film 30 and a light guide plate 40. The back panel 20 includes a recessed structure. The reflective film 30 is fixed to the bottom 21 of the recessed structure through a first colloid 11. The light guide plate 40 is connected to the back panel 20 through a second colloid 12. The light guide plate 40 is arranged on a side of the reflective film 30 away from the back panel 20. The light source 10 is fixed to the side 22 of the recessed structure.

[0033] In the embodiment of the present application, the back plate 20 is a concave structure, which includes a bottom 21 and a side portion 22 located at the edge of the bottom and perpendicular to the bottom 21, and the light source 10, the reflective film 30 and the light guide plate 40 are all arranged inside the concave structure of the back plate 20. Among them, the reflective film 30 and the light guide plate 40 are stacked and arranged at the bottom 21 of the concave structure, and the light source 10 is fixed to the inner wall of the side portion 22 of the concave structure, that is, the side of the side portion 22 facing the reflective film 30 and the light guide plate 40.

[0034] The light source 10 may be a strip light strip.

[0035] The reflective film 30 is directly adhered to the bottom 21 of the recessed structure through the first colloid 11. The light guide plate 40 is located on the side of the reflective film 30 away from the bottom 21 of the back panel 20. However, the light guide plate 40 is not adhered to the reflective film 30, but is directly bonded to the back panel 20 through the second colloid 12, specifically connected to the bottom 21 of the back panel 20 through the second colloid 12.

[0036] In order to connect the light guide plate 40 across the reflective film 30 and the back plate 20, the projection area of ​​the reflective film 30 on the bottom 21 is smaller than the projection area of ​​the light guide plate 40 on the bottom 21. An area is reserved for the connection between the light guide plate 40 and the bottom 21 of the back plate 20.

[0037] That is, the second colloid 12 is located in the area of ​​the bottom 21 except the projection area of ​​the reflective film 30. Specifically, the second colloid 12 is located in the projection area of ​​the light guide plate 40 on the bottom 21 except the projection area corresponding to the reflective film 30.

[0038] In the case where the projection area of ​​the reflective film 30 on the bottom 21 is smaller than the projection area of ​​the light guide plate 40 on the bottom 21, in a possible implementation, the projection area of ​​the reflective film 30 on the bottom 21 is located within the projection area of ​​the light guide plate 40 on the bottom 21. Figure 4 As shown, the edges of the reflective film 30 may be located in the projection area corresponding to the light guide plate 40. Figure 5 and Figure 6 As shown, part of the edge of the reflective film 30 may be located in the projection area corresponding to the light guide plate 40 , and the remaining edge may overlap with the edge of the projection area corresponding to the light guide plate 40 .

[0039] The backlight device provided by the embodiment of the present application includes a light source, a back plate, a reflective film and a light guide plate, the back plate includes a recessed structure, the reflective film is fixed to the bottom of the recessed structure by a first colloid, the light guide plate is connected to the back plate by a second colloid, the light guide plate is arranged on the side of the reflective film away from the back plate, and the light source is fixed to the side of the recessed structure. The embodiment of the present application reserves an area other than the projection area corresponding to the reflective film in the projection area corresponding to the light guide plate, that is, a reserved position for the second colloid, so that the light guide plate can be directly connected to the back plate through the second colloid, avoiding the light guide plate being fixed to the back plate as an intermediate component through the reflective film, so that the light guide plate can be connected to the stable back plate, and in the case of vibration, the influence of the unstable factor of the reflective film that also vibrates is avoided, the vibration intensity of the light guide plate is effectively reduced, the inertial force between the light guide plate and the reflective film is reduced, and the defects such as white spots of the backlight device are avoided, thereby ensuring the quality of the backlight device.

[0040] The above-mentioned embodiment introduces a solution of setting the projection area of ​​the reflective film 30 on the bottom 21 of the back plate to be smaller than the projection area of ​​the light guide plate 40 on the bottom 21 of the back plate to reserve a position for the connecting medium (the second colloid 12) of the light guide plate 40 and the back plate 20. In another embodiment of the present application, the length difference between the reflective film 30 and the light guide plate 20 can be set in the first direction, so as to reserve a placement area for the second colloid 12. This embodiment includes: In the first direction, the length of the reflective film 30 is shorter than the length of the light guide plate 20 .

[0041] The light guide plate 40 has a light incident side on a side close to the light source 10 and a light emitting side opposite to the light incident side, and the first direction is the direction from the light incident side to the light emitting side. Figure 3 In the direction of the arrow.

[0042] It is understandable that the light source 10 is fixed to the inner wall of one of the side portions 22 of the back plate 20. The light emitted by the light source 10 is incident from the side of the light guide plate 40 close to the light source 10 (i.e., the light incident side), and the side of the light guide plate 40 opposite to the light incident side is the light emitting side.

[0043] In a possible implementation, the second colloid 12 is disposed on the light emitting side and / or the light incident side of the light guide plate 40 .

[0044] In the embodiment of the present application, considering that the side where the light source 10 is located is often the long side of the back panel 20, and the back panel 20 has a larger frame area on the light emitting side and the light incident side, the second colloid 12 is arranged on the light emitting side and / or the light incident side of the light guide plate 40, so that the second colloid 12 has a larger attachment area, thereby improving the connection stability between the light guide plate 40 and the back panel 20.

[0045] like Figure 7 As shown, two second colloids 12 may be arranged on the light exiting side and the light entering side of the light guide plate 40; Figure 8 As shown, a second colloid 12 is disposed on the light emitting side of the light guide plate 40; Fig. 9 As shown, a second colloid 12 is disposed on the light incident side of the light guide plate 40 .

[0046] When the second colloid 12 is disposed on one of the light exiting side and the light entering side of the light guide plate 40, preferably, as Fig. 9 and Fig.10 As shown, the second colloid 12 is arranged on the light incident side. This embodiment takes into account that a side of the light guide plate 40 close to the light source 10 is provided with dots for improving brightness. Therefore, arranging the second colloid 12 on the light incident side of the light guide plate 40 can suppress the thermal expansion and contraction of the light guide plate 40 in the first direction, thereby ensuring the position of the dots, avoiding displacement of the dots relative to the light source 10 and affecting the brightness improvement effect of the dots, and ensuring the light efficiency of the backlight device.

[0047] In addition, for backlight devices smaller than 14.6 inches, the second colloid 12 disposed on the light incident side can ensure the connection stability between the light guide plate 40 and the back plate 20 and the light efficiency of the backlight device, and can also save the cost of the second colloid 12 .

[0048] When the second colloid 12 is disposed on both the light emitting side and the light incident side of the light guide plate 40 , in the first direction, the size of the second colloid 12 disposed on the light emitting side is greater than or equal to the size of the second colloid 12 disposed on the light incident side.

[0049] In the embodiment of the present application, considering that the size of the light source 10 in the direction perpendicular to the plane of the light guide plate is relatively large, the side of the bottom 22 of the back plate close to the light source 10 needs to be set to a certain degree of sinking to accommodate the light source 10. In this case, the thickness of the second colloid 12 arranged on the light incident side is greater than the thickness of the second colloid 12 arranged on the light emitting side. Therefore, in the first direction, the size (i.e., width) of the second colloid 12 on the light emitting side can be set to be greater than or equal to the size (i.e., width) of the second colloid 12 on the light incident side, so as to ensure the viscosity strength of the second colloid 12 on the light emitting side and ensure the connection stability between the light emitting side of the light guide plate 40 and the back plate 20.

[0050] Preferably, the size (ie, width) of the second colloid 12 disposed on the light incident side in the first direction is in the range of 1.8-2 mm, and the size (ie, width) of the second colloid 12 disposed on the light exit side in the first direction is in the range of 2-2.5 mm.

[0051] In a plane parallel to the light guide plate 40 and in a direction perpendicular to the first direction, the size (ie, length) of the second colloid 12 is the same as the size of the light guide plate 40 in the direction perpendicular to the first direction.

[0052] In one possible implementation, in the case where a certain degree of sinking is required on the side of the bottom 22 of the back panel close to the light source 10 to accommodate the light source 10, since the light incident side of the light guide plate 40 needs to be connected to the back panel 20 through a thicker second colloid 12, the second colloid 12 arranged on the light incident side can be selected as a composite double-sided adhesive to ensure the stability of the connection between the light guide plate 40 and the back panel 20.

[0053] In a possible implementation, the color of the second colloid 12 can be white or off-white. The white or off-white second colloid 12 can play the role of supplementary light like the reflective film 30, preventing the darker (eg, gray-black) backplane 20 from affecting the light effect of the backlight device.

[0054] In one embodiment, Fig.11 As shown, in the first direction, there is a gap between the second colloid 12 and the reflective film 30 .

[0055] In the embodiment of the present application, a gap should be set between the second colloid 12 and the reflective film 30 to avoid adhesion between the second colloid 12 and the reflective film 30, which may cause a large force between the light guide plate 40 and the reflective film 30 in the case of vibration, thereby avoiding defects between the light guide plate 40 and the reflective film 30; at the same time, the stability of the backlight edge brightness is ensured.

[0056] In a possible implementation, the gap width between the second colloid 12 disposed on the light incident side and the reflective film 30 is less than or equal to 0.2 mm, and the gap width between the second colloid 12 disposed on the light emitting side and the reflective film 30 is less than or equal to 0.5 mm.

[0057] That is, by setting Gap1≤0.2mm and Gap2≤0.5mm, it is possible to avoid the gap between the second colloid 12 and the reflective film 30 being too wide, which would cause the darker back plate 20 to affect the light effect of the backlight device.

[0058] In one embodiment, the thickness of the second colloid 12 is greater than the first distance, and the first distance is the distance between the light guide plate 40 and the back plate 20 .

[0059] That is, the thickness of the second colloid 12 should have a certain margin relative to the distance between the light guide plate 40 and the bottom 21 of the back plate to ensure the connection stability between the light guide plate 40 and the back plate 20; at the same time, it is necessary to avoid excessive margins that cause the second colloid 12 to lift up the light guide plate 40, causing the light guide plate 40 to shift. Therefore, preferably, the difference between the thickness of the second colloid 12 and the first gap is within the range of 0.1-0.15mm. That is, 0.1mm≤Gap4≤0.15mm.

[0060] In one embodiment, for the first colloid 11, the width (i.e., the dimension in the first direction) of the first colloid 11 can be set to 2 mm, the thickness can be set to 0.05 mm, and the length (i.e., the dimension in the direction perpendicular to the first direction on the plane parallel to the light guide plate 40) can be the same as the length of the reflective film 30; or, the width of the first colloid 11 can be set to 5 mm, the thickness can be set to 0.05 mm, and the length can be set to half the length of the reflective film 30.

[0061] In a possible implementation, considering that the first colloid 11 should be disposed within the projection area of ​​the reflective film 30, the distance between the first colloid 11 and the second colloid 12 in the first direction is greater than the distance between the reflective film 30 and the second colloid 12, that is, Gap3>Gap1. Gap3 may be 2 mm.

[0062] In one embodiment, Figure 3 As shown, the backlight device further includes a limiting structure 50, such as Fig.12 and Fig.13As shown, the limiting structure 50 includes a limiting frame 51 and at least one connecting member 52 arranged at the edge of the limiting frame 51. The end surface of the side portion 22 of the back plate 20 is provided with a groove 23. When the connecting member 52 is placed in the groove 23, the limiting structure 50 is connected to the back plate 20. The connecting member 52 includes a connecting member body 521 and an extension portion 522 extending in the second direction. The shape of the groove 23 matches the shape of the connecting member 52. The groove 23 includes a main body area 231 and an extension area 232 extending in the second direction. There is a gap between the extension area 232 and the end surface.

[0063] The second direction is the extending direction of the edge of the limiting frame 51 where the connecting member 52 is located. That is, the direction of the arrow in the figure. Fig.13 for Fig.12 FF' cross-section.

[0064] Specifically, there is a gap between the extension area 232 of the groove 23 and one side of the end surface close to the inside of the concave structure, namely, Gap5. Fig.14 and Fig.15 The "I" shape of the connecting member and the groove in the prior art shown in the figure is easy to cause the middle iron frame (limiting structure) to sink or warp toward the inside of the recessed structure of the back plate under vibration or harsh environment. The present application sets a gap between the groove 23 for placing the connecting member 52 and the edge of the end face, that is, sets Gap5, so as to limit the connecting member 52, thereby achieving the effect of limiting the position of the limiting structure 50, and avoiding the problem of bending of the limiting structure toward the inside of the recessed structure of the back plate 20. Among them, Fig.15 for Fig.14 EE' cross-section diagram.

[0065] In one embodiment, the shape of the connecting member 52 is at least one of a T-shape and a trapezoidal shape.

[0066] That is, the connecting member 52 may be Fig.12 The T-shape shown can also be Fig.16 The trapezoid shown in the figure only needs to ensure that there is a gap between the extension area 232 of the groove 23 extending in the second direction and the end surface to achieve all-round positioning of the connecting member 52.

[0067] In one possible implementation, Fig.17 As shown, the length of the connecting member 52 in the second direction may be 15 mm, and the dimension of the extending portion 522 of the connecting member 52 in the direction perpendicular to the second direction may be 1 mm, that is, the length L of the connecting member 52 is 15 mm, and the width W is 1 mm. Preferably, the connecting member 52 of this size is suitable for a 17.3-inch backlight device.

[0068] In a possible implementation, the first gap between the connecting member 52 and the groove 23 may be less than or equal to 0.5 mm, and the second gap between the connecting member 52 and the groove 23 may be less than or equal to 0.2 mm. The first gap is the distance between the edge of the connecting member 52 and the edge of the groove 23 in the second direction, and the second gap is the distance between the edge of the connecting member 52 and the edge of the groove 23 in the direction perpendicular to the second direction. This gap range can ensure that the shape and size of the connecting member 52 and the groove 23 match, thereby ensuring the connection stability between the connecting member 52 and the groove 23.

[0069] In one embodiment, Fig.13 As shown, the backlight device may further include a third colloid 13 , and when the connecting member 52 is adhered in the groove 23 through the third colloid 13 , the limiting structure 50 is connected to the back plate 20 .

[0070] In the embodiment of the present application, the connecting member 52 and the groove 23 can be matched in shape and size to ensure the connection stability between the two. The connection stability between the connecting member 52 and the groove 23 can also be further improved by the third colloid 13, thereby ensuring the connection stability between the limiting structure 50 and the back plate 20.

[0071] In one embodiment, Fig.13 As shown, when the connecting member 52 is placed in the groove 23 , the first surface of the connecting member 52 is located between the end surface and the bottom surface of the groove 23 .

[0072] The first surface of the connecting member 52 is a surface of the connecting member 52 away from the bottom surface of the groove 23 .

[0073] That is, the first surface of the connector 52 is lower than the end surface of the side portion 22 of the back plate 20. Specifically, the sinking height of the first surface of the connector 52 relative to the end surface (i.e., the distance between the first surface of the connector 52 and the end surface) is in the range of 0.1 to 0.2 mm, i.e., 0.1 mm ≤ Gap6 ≤ 0.2 mm. The sinking of the first surface of the connector 52 relative to the end surface by a certain distance can further improve the position limiting effect of Gap5 on the connector 52, and avoid problems such as bending of the limiting structure 50.

[0074] In one embodiment, Fig.18 As shown, at least one connecting member 52 is distributed on the first boundary and the second boundary of the limiting frame 51 in the limiting structure 50, and the distance B between the first connecting member 52 near the endpoint on the first boundary and the endpoint is smaller than the distance A between the second connecting member 52 near the endpoint on the second boundary and the endpoint.

[0075] The length of the first boundary is smaller than the length of the second boundary; and the endpoint is the intersection of the first boundary and the second boundary.

[0076] In a possible implementation, when the size of the backlight device is less than 12.3 inches, three connectors 52 may be provided on the long side (second boundary) of the limiting frame 51, and two connectors 52 may be provided on the short side (first boundary); when the size of the backlight device is in the range of 12.3 to 17.3 inches, four connectors 52 may be provided on the long side of the limiting frame 51, and three connectors 52 may be provided on the short side; when the size of the backlight device is greater than 17.3 inches, one connector 52 may be provided at intervals of 60 to 100 mm.

[0077] Preferably, B=A / 2 can be set. This distance relationship can prevent the first connecting member 52 and the second connecting member 52 from being too far away from the endpoint, resulting in a small supporting force of the limit frame 51 within the range of the endpoint, thereby causing the limit frame 51 to be recessed into the recessed structure of the back plate 20 and compressing optical film materials such as the prism sheet, light guide plate, and reflective film, resulting in a poor backlight device; this distance relationship can also prevent the first connecting member 52 and the second connecting member 52 from being too close to the endpoint, resulting in difficulty in installing the limit structure 50 and the back plate 20. That is, this distance relationship makes it easy to install the limit structure 50 and the back plate 20, and can also ensure the supporting force of the end of the limit frame 51 and the structural stability of the backlight device.

[0078] In one embodiment, a display panel is provided, which includes the backlight device described in the above embodiment. The backlight device includes a light source 10, a back plate 20, a reflective film 30 and a light guide plate 40, the back plate 20 includes a recessed structure, the reflective film 30 is fixed to the bottom 21 of the recessed structure through a first colloid 11, the light guide plate 40 is connected to the back plate 20 through a second colloid 12, the light guide plate 40 is arranged on a side of the reflective film 30 away from the back plate 20, and the light source 10 is fixed to the side 22 of the recessed structure.

[0079] In the embodiment of the present application, the back plate 20 is a concave structure, which includes a bottom 21 and a side portion 22 located at the edge of the bottom and perpendicular to the bottom 21, and the light source 10, the reflective film 30 and the light guide plate 40 are all arranged inside the concave structure of the back plate 20. Among them, the reflective film 30 and the light guide plate 40 are stacked and arranged at the bottom 21 of the concave structure, and the light source 10 is fixed to the inner wall of the side portion 22 of the concave structure, that is, the side of the side portion 22 facing the reflective film 30 and the light guide plate 40.

[0080] The light source 10 may be a strip light strip.

[0081] The reflective film 30 is directly adhered to the bottom 21 of the recessed structure through the first colloid 11. The light guide plate 40 is located on the side of the reflective film 30 away from the bottom 21 of the back panel 20. However, the light guide plate 40 is not adhered to the reflective film 30, but is directly bonded to the back panel 20 through the second colloid 12, specifically connected to the bottom 21 of the back panel 20 through the second colloid 12.

[0082] In order to connect the light guide plate 40 across the reflective film 30 and the back plate 20, the projection area of ​​the reflective film 30 on the bottom 21 is smaller than the projection area of ​​the light guide plate 40 on the bottom 21. An area is reserved for the connection between the light guide plate 40 and the bottom 21 of the back plate 20.

[0083] That is, the second colloid 12 is located in the area of ​​the bottom 21 except the projection area of ​​the reflective film 30. Specifically, the second colloid 12 is located in the projection area of ​​the light guide plate 40 on the bottom 21 except the projection area corresponding to the reflective film 30.

[0084] In the case where the projection area of ​​the reflective film 30 on the bottom 21 is smaller than the projection area of ​​the light guide plate 40 on the bottom 21, in a possible implementation, the projection area of ​​the reflective film 30 on the bottom 21 is located within the projection area of ​​the light guide plate 40 on the bottom 21. The edges of the reflective film 30 may all be located within the projection area corresponding to the light guide plate 40; or part of the edges of the reflective film 30 may be located within the projection area corresponding to the light guide plate 40, and the remaining edges may overlap with the edges of the projection area corresponding to the light guide plate 40.

[0085] The display panel provided by the embodiment of the present application includes a backlight device, the backlight device includes a light source, a back plate, a reflective film and a light guide plate, the back plate includes a concave structure, the reflective film is fixed to the bottom of the concave structure by a first colloid, the light guide plate is connected to the back plate by a second colloid, the light guide plate is arranged on the side of the reflective film away from the back plate, and the light source is fixed to the side of the concave structure. The embodiment of the present application reserves an area other than the projection area corresponding to the reflective film in the projection area corresponding to the light guide plate, that is, a reserved position for the second colloid, so that the light guide plate can be directly connected to the back plate through the second colloid, avoiding the light guide plate being fixed to the back plate as an intermediate component through the reflective film, so that the light guide plate can be connected to the stable back plate, and in the case of vibration, the influence of the unstable factor of the reflective film that also vibrates is avoided, the vibration intensity of the light guide plate is effectively reduced, the inertial force between the light guide plate and the reflective film is reduced, and the defects such as white spots of the backlight device are avoided, thereby ensuring the quality of the backlight device and further ensuring the quality of the display panel.

[0086] In one embodiment, a display device is provided, the display device comprising the display panel as described in the above embodiment. The display panel comprises a backlight device, the backlight device comprises a light source 10, a back plate 20, a reflective film 30 and a light guide plate 40, the back plate 20 comprises a recessed structure, the reflective film 30 is fixed to the bottom 21 of the recessed structure by a first colloid 11, the light guide plate 40 is connected to the back plate 20 by a second colloid 12, the light guide plate 40 is arranged on a side of the reflective film 30 away from the back plate 20, and the light source 10 is fixed to the side 22 of the recessed structure.

[0087] In the embodiment of the present application, the back plate 20 is a concave structure, which includes a bottom 21 and a side portion 22 located at the edge of the bottom and perpendicular to the bottom 21, and the light source 10, the reflective film 30 and the light guide plate 40 are all arranged inside the concave structure of the back plate 20. Among them, the reflective film 30 and the light guide plate 40 are stacked and arranged at the bottom 21 of the concave structure, and the light source 10 is fixed to the inner wall of the side portion 22 of the concave structure, that is, the side of the side portion 22 facing the reflective film 30 and the light guide plate 40.

[0088] The light source 10 may be a strip light strip.

[0089] The reflective film 30 is directly adhered to the bottom 21 of the recessed structure through the first colloid 11. The light guide plate 40 is located on the side of the reflective film 30 away from the bottom 21 of the back panel 20. However, the light guide plate 40 is not adhered to the reflective film 30, but is directly bonded to the back panel 20 through the second colloid 12, specifically connected to the bottom 21 of the back panel 20 through the second colloid 12.

[0090] In order to connect the light guide plate 40 across the reflective film 30 and the back plate 20, the projection area of ​​the reflective film 30 on the bottom 21 is smaller than the projection area of ​​the light guide plate 40 on the bottom 21. An area is reserved for the connection between the light guide plate 40 and the bottom 21 of the back plate 20.

[0091] That is, the second colloid 12 is located in the area of ​​the bottom 21 except the projection area of ​​the reflective film 30. Specifically, the second colloid 12 is located in the projection area of ​​the light guide plate 40 on the bottom 21 except the projection area corresponding to the reflective film 30.

[0092] In the case where the projection area of ​​the reflective film 30 on the bottom 21 is smaller than the projection area of ​​the light guide plate 40 on the bottom 21, in a possible implementation, the projection area of ​​the reflective film 30 on the bottom 21 is located within the projection area of ​​the light guide plate 40 on the bottom 21. The edges of the reflective film 30 may all be located within the projection area corresponding to the light guide plate 40. Alternatively, part of the edge of the reflective film 30 may be located within the projection area corresponding to the light guide plate 40, and the remaining edge may overlap with the edge of the projection area corresponding to the light guide plate 40.

[0093] The display device provided by the embodiment of the present application includes a display panel, the display panel includes a backlight device, the backlight device includes a light source, a back plate, a reflective film and a light guide plate, the back plate includes a recessed structure, the reflective film is fixed to the bottom of the recessed structure by a first colloid, the light guide plate is connected to the back plate by a second colloid, the light guide plate is arranged on the side of the reflective film away from the back plate, and the light source is fixed to the side of the recessed structure. The embodiment of the present application reserves an area other than the projection area corresponding to the reflective film in the projection area corresponding to the light guide plate, that is, a reserved position for the second colloid, so that the light guide plate can be directly connected to the back plate through the second colloid, avoiding the light guide plate being fixed to the back plate as an intermediate component through the reflective film, so that the light guide plate can be connected to the stable back plate, and in the case of vibration, the influence of the unstable factor of the reflective film that also vibrates is avoided, the vibration intensity of the light guide plate is effectively reduced, the inertial force between the light guide plate and the reflective film is reduced, and the defects such as white spots of the backlight device are avoided, thereby ensuring the quality of the backlight device, and then ensuring the quality of the display panel, that is, ensuring the quality of the display device.

[0094] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. A backlight device, characterized in that: The device comprises a light source, a back plate, a reflective film and a light guide plate, wherein the back plate comprises a concave structure, the reflective film is fixed to the bottom of the concave structure by a first colloid, the light guide plate is connected to the back plate by a second colloid, the light guide plate is arranged on a side of the reflective film away from the back plate, and the light source is fixed to the side of the concave structure. The projection area of ​​the reflective film on the bottom is smaller than the projection area of ​​the light guide plate on the bottom, and the second colloid is located in the area of ​​the bottom except the projection area of ​​the reflective film.

2. The backlight device according to claim 1, characterized in that: In the first direction, the length of the reflective film is smaller than the length of the light guide plate; The light guide plate has a light incident side on a side close to the light source, and has a light emitting side opposite to the light incident side, and the first direction is a direction from the light incident side to the light emitting side.

3. The backlight device according to claim 2, characterized in that: The second colloid is arranged on the light emitting side and / or the light incident side of the light guide plate.

4. The backlight device according to claim 3, characterized in that: In the first direction, the size of the second colloid disposed on the light-exiting side is greater than or equal to the size of the second colloid disposed on the light-incident side.

5. The backlight device according to claim 3, characterized in that: In the first direction, there is a gap between the second colloid and the reflective film.

6. The backlight device according to claim 5, characterized in that: The width of the gap between the second colloid disposed on the light incident side and the reflective film is less than or equal to 0.2 mm, and the width of the gap between the second colloid disposed on the light emitting side and the reflective film is less than or equal to 0.5 mm.

7. The backlight device according to claim 1, characterized in that: The thickness of the second colloid is greater than the first spacing, and the first spacing is the distance between the light guide plate and the back plate.

8. The backlight device according to claim 7, characterized in that: The difference between the thickness of the second colloid and the first distance is in the range of 0.1-0.15 mm.

9. The backlight device according to claim 1, characterized in that: The backlight device further comprises a limiting structure, which comprises a limiting frame and at least one connecting member arranged at the edge of the limiting frame. The end surface of the side of the back plate is provided with a groove. When the connecting member is placed in the groove, the limiting structure is connected to the back plate. The connecting member includes a connecting member body and an extension portion extending in a second direction. The shape of the groove matches the shape of the connecting member. The groove includes a main body area and an extension area extending in the second direction. There is a gap between the extension area and the end face. The second direction is the extension direction of the edge of the limiting frame where the connecting member is located.

10. The backlight device according to claim 9, characterized in that: The backlight device further comprises a third colloid, and when the connecting member is adhered in the groove through the third colloid, the limiting structure is connected to the back plate.

11. The backlight device according to claim 9, characterized in that: The shape of the connecting piece is at least one of a T-shape and a trapezoid.

12. The backlight device according to claim 9, characterized in that: When the connecting member is placed in the groove, the first surface of the connecting member is located between the end surface and the bottom surface of the groove; the first surface of the connecting member is the surface of the connecting member away from the bottom surface of the groove.

13. A display panel, characterized in that: The display panel comprises the backlight device according to any one of claims 1-12.

14. A display device, characterized in that: The display device comprises the display panel as claimed in claim 13.

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