Patent ID: 12216347

Reference signs are as follows.

11—back plate,12—plastic frame,13—light source assembly,14—reflective sheet,15—light guide plate,16—optical membrane group,21—first double-sided adhesive tape,22—second double-sided adhesive tape,23—third double-sided adhesive tape,31—first adhesive tape,32—second adhesive tape,41—fixation frame,51—display panel,111—bottom plate,112—side plate,121—first rectangular annular step,122—second rectangular annular step,123—third rectangular annular step,124—transition surface,125—avoidance groove,126—first fixation boss,127—clamping groove,128—second fixation boss,131—circuit board,132—light source,161—first lug,161a—first lug of first optical membrane,161b—first lug of second optical membrane,161c—first lug of third optical membrane,162—second lug,411—frame plate,412—baffle plate,1201—first bezel,1202—second bezel,1203—third bezel,1204—fourth bezel,1221—accommodation groove.

DETAILED DESCRIPTION

Those of ordinary skills in the art should understand that modifications or equivalent replacements may be made to the technical solutions of the embodiments of the present disclosure without departing from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should all fall within the scope of the claims of the present disclosure.

An embodiment of the present disclosure provides a backlight module. In some exemplary embodiments, as shown inFIG.1,FIG.1is a schematic diagram of a cross-sectional structure of a display module according to some exemplary embodiments. The backlight module includes a back plate11, a plastic frame12disposed on one side of the back plate11and connected with the back plate11, a light source assembly13located on an inner side of the plastic frame12, and a reflective sheet14, a light guide plate15, and an optical membrane group16sequentially stacked and located on the inner side of the plastic frame12.

The light source assembly13includes a circuit board131and a light source132disposed on a first side surface of the circuit board131. The light source132is located at a first side edge of the light guide plate15, the light guide plate15includes a first surface facing the reflective sheet14and a second surface facing away from the reflective sheet14.

A first rectangular annular step121and a second rectangular annular step122are provided on an end face of the plastic frame12facing the back plate11. A portion of the reflective sheet14close to an outer edge thereof is bonded to the first rectangular annular step121through a first double-sided adhesive tape21. The reflective sheet14is also bonded by the first double-sided adhesive tape21to a portion of the first surface of the light guide plate15close to remaining side edges except the first side edge.

A portion of the second surface of the light guide plate15close to an outer edge thereof is disposed toward the second rectangular annular step122, and a portion of the second surface of the light guide plate15close to the first side edge is fixed on the second rectangular annular step122.

According to the backlight module of the embodiment of the present disclosure, the reflective sheet14and the light guide plate15may be respectively limited and fixed through the first rectangular annular step121and the second rectangular annular step122disposed on the plastic frame12, the reflective sheet14is fixed on the first rectangular annular step121through the first double-sided adhesive tap21, the reflective sheet14is bonded to the portion of the first surface of the light guide plate15close to the remaining side edges except the first side edge, and the portion of the second surface of the light guide plate15close to the first side edge is fixed on the second rectangular annular step122. In this way, the reflective sheet14, the light guide plate15, and the plastic frame12are fixed together to form a whole, and the light guide plate15and the reflective sheet14may be prevented from moving inside the backlight module, which is conducive to enhancing overall stability of the backlight module and facilitating assembling of the backlight module.

In some exemplary embodiments, as shown inFIG.1, the second rectangular annular step122may be provided with an accommodation groove1221, a side surface of the circuit board131facing away from the light source132is bonded inside the accommodation groove1221through a second double-sided adhesive tape22, and a portion of the second surface of the light guide plate15close to the first side edge is bonded to the first side surface of the circuit board131through a third double-sided adhesive tape23, as shown by B inFIG.1.

In this embodiment, the light source assembly13is fixed on the plastic frame12, and a portion of the second surface of the light guide plate15close to the first side edge is fixed on the circuit board131of the light source assembly13, so that the light source assembly13, the reflective sheet14, the light guide plate15, and the plastic frame12may be fixed together to form a whole, which is convenient to be assembled with the back plate11, and stability of the whole backlight module may be enhanced. By disposing the circuit board131of the light source assembly13inside the accommodation groove1221, the first side surface of the circuit board131is substantially flush with a surface of the second rectangular annular step122, thereby avoiding damage to the light guide plate15caused by an uneven surface.

Exemplarily, as shown inFIG.2,FIG.2is a schematic diagram of a top view of a structure of the backlight module inFIG.1in some exemplary embodiments. The plastic frame12may be rectangular and the plastic frame12may include a first bezel1201and a second bezel1202which are opposite to each other, and a third bezel1203and a fourth bezel1204which are opposite to each other. Accordingly, the reflective sheet14and the light guide plate15may both have rectangular shapes, the light guide plate15and the reflective sheet14each include a first side edge and a second side edge which are opposite to each other, and a third side edge and a fourth side edge which are opposite to each other. A first side edge, a second side edge, a third side edge, and a fourth side edge of the light guide plate15are respectively disposed close to the first bezel1201, the second bezel1202, the third bezel1203, and the fourth bezel1204of the plastic frame12. As shown inFIGS.1and2, the accommodation groove1221may be provided on the first bezel1201, the circuit board131may be an elongated flexible circuit board or a hard circuit board, and the accommodation groove1221may extend along a length direction of the first bezel1201. A portion of the reflective sheet14close to an outer edge (four side edges) thereof is bonded on the first rectangular annular step121through the first double-sided adhesive tape21, the reflective sheet14is also bonded to portions of the first surface of the light guide plate15close to the second side edge, the third side edge, and the fourth side edge through the first double-sided adhesive tape21, as shown by A inFIG.1, and a portion of the first surface of the light guide plate15close to the first side edge is not bonded to the reflective sheet14, as shown by C inFIG.1.

In other implementation modes, the portion of the second surface of the light guide plate close to the first side edge may be bonded on the second rectangular annular step through a fourth double-sided adhesive tape. The plastic frame includes a transition surface connected between the first rectangular annular step and the second rectangular annular step, and the side surface of the circuit board of the light source assembly facing away from the light source may be fixed on the transition surface through a double-sided adhesive tape.

In some exemplary embodiments, as shown inFIG.1, the plastic frame12includes a transition surface124connected between the first rectangular annular step121and the second rectangular annular step122. The light source132is located between the first side edge of the light guide plate15and the transition surface124, and a distance between the first side edge of the light guide plate15and the transition surface124is greater than a distance between a remaining side edge of the light guide plate15and the transition surface124. In this way, there may be enough space between the first side edge of the light guide plate15and the transition surface124to accommodate the light source assembly13, and it is convenient for the first double-sided adhesive tape21to bond the portion of the first surface of the light guide plate15close to the remaining side edge except the first side edge to the reflective sheet14.

In some exemplary embodiments, as shown inFIG.1, a third rectangular annular step123may be provided on an end face of the plastic frame12facing away from the back plate11, and the third rectangular annular step123is configured to limit a portion of a display panel51facing away from a display side close to an outer edge.

In some exemplary embodiments, as shown inFIG.1, the back plate11may include a bottom plate111and a side plate112disposed at an outer edge of the bottom plate111, and the side plate112is disposed around an outer side of the plastic frame12. Exemplarily, the plastic frame12may be snap-fitted with the side plate112through a snap to fix the plastic frame12and the back plate11with each other.

In some exemplary embodiments, as shown inFIG.1, the optical membrane group16may include multiple optical membranes that are stacked. Exemplarily, the optical membrane group16may include three optical membranes that are stacked, along a direction away from the light guide plate15. The three optical membranes may be sequentially a diffusion sheet, a first prism sheet, and a second prism sheet. The diffusion sheet may further homogenize light emitted from the second surface of the light guide plate15, and the first prism sheet and the second prism sheet may converge light emitted from the diffusion sheet in a front direction, and play a role in brightening. In other implementation modes, a quantity of optical membranes of the optical membrane group may be three or more, etc.

In some exemplary embodiments, as shown inFIGS.3,4, and5,FIG.3is a schematic diagram of a partial structure of the backlight module ofFIG.2at A′ in some exemplary embodiments,FIG.4is a schematic diagram of a partial structure of a plastic frame inFIG.3, andFIG.5is a schematic diagram of a partial cross-sectional structure of the backlight module ofFIG.2at A′ in some exemplary embodiments. The optical membrane group16includes multiple optical membranes that are stacked, an avoidance groove125is provided on at least one bezel of the plastic frame12, and a first lug161is provided on a side edge of each optical membrane close to the avoidance groove125. The first lug161of each optical membrane extends into the avoidance groove125and is fixed inside the avoidance groove125through a first adhesive tape31.

In an example of this embodiment, as shown inFIGS.3,4, and5, the plastic frame12is provided with a first fixation boss126on each of two sides of the avoidance groove125, and the first adhesive tape31is provided with a bonding surface facing the optical membranes. The bonding surface of the first adhesive tape31is provided with a step structure, two ends of the first adhesive tape31are respectively bonded on two first fixation bosses126, and each step of the step structure is bonded to a corresponding one of the first lugs161, thereby fixing the first lug161of each optical membrane inside the avoidance groove125. Exemplarily, the avoidance groove125may be provided at the third rectangular annular step123, a surface of the first fixation boss126that is bonded to the first adhesive tape31may be lower than a surface of the third rectangular annular step123that faces away from the light guide plate15, and a surface of the first adhesive tape31that faces away from the bonding surface may be substantially flush with the surface of the third rectangular annular step123that faces away from the light guide plate15.

Exemplarily, as shown inFIG.3andFIG.5, multiple first lugs may be stacked, in two adjacent optical membranes, a first lug of an optical membrane away from the light guide plate partially exposes a first lug of an optical membrane close to the light guide plate. Taking a case in which the optical membrane group16includes three optical membranes as an example, along a direction away from the light guide plate15, the three optical membranes are sequentially a first optical membrane, a second optical membrane, and a third optical membrane. A first lug161bof the second optical membrane partially exposes a first lug161aof the first optical membrane, and a first lug161cof the third optical membrane partially exposes the first lug161bof the second optical membrane. An exposed portion of the first lug161aof the first optical membrane, an exposed portion of the first lug161bof the second optical membrane, and the first lug161cof the third optical membrane are formed in a step shape so as to be correspondingly bonded to each step of the step structure of the first adhesive tape31. An avoidance groove125may be disposed on one bezel of the plastic frame12, and the avoidance groove125may extend along a length direction of one bezel of the plastic frame12where the avoidance groove125is located.

In some exemplary embodiments, as shown inFIG.6andFIG.7,FIG.6is a schematic diagram of a partial structure of the backlight module ofFIG.2at B′ or C′ in some exemplary embodiments,FIG.7is a schematic diagram of a partial structure after a second adhesive tape is removed inFIG.6. The optical membrane group16includes multiple optical membranes that are stacked, at least one bezel of the plastic frame12is provided with a clamping groove127, and a second lug162ais provided on a side edge of each optical membrane close to the clamping groove127, and multiple second lugs162are stacked and extend into the clamping groove127. In this embodiment, the clamping groove127cooperates with the multiple second lugs162, which may play a role of limiting each of the optical membranes.

Exemplarily, as shown inFIG.6andFIG.7, the plastic frame12may be provided with a second fixation boss128on each of two sides of the clamping groove127, and the second fixation boss128is bonded with a second adhesive tape32, the second adhesive tape32crosses the clamping groove127and is located on a side of the multiple second lugs162facing away from the light guide plate15, and the second adhesive tape32is not bonded to the second lugs162. The second adhesive tape32may play a role of limiting to prevent the multiple second lugs162from jumping out of the clamping groove127, and the second adhesive tape32is not bonded to the second lugs162, so that the optical membranes will not be deformed due to being completely fixed when thermal expansion occurs.

Exemplarily, as shown inFIG.6andFIG.7, one or more clamping grooves127may be provided on one bezel of the plastic frame12, and sizes of the multiple second lugs162may be the same or different. The clamping groove127may be provided at the third rectangular annular step123, a surface of the second fixation boss128that is bonded to the second adhesive tape32may be lower than the surface of the third rectangular annular step123that faces away from the light guide plate15, and a surface of the second adhesive tape32that faces away from the bonding surface may be substantially flush with the surface of the third rectangular annular step123that faces away from the light guide plate15. The clamping groove and the avoidance groove may be respectively disposed on different bezels of the plastic frame. For example, as shown inFIG.2, the avoidance groove may be disposed on the third bezel1203of the plastic frame12, and the clamping groove is disposed on the fourth bezel1204of the plastic frame12.

An embodiment of the present disclosure further provides a display module, and the display module includes a display panel and a backlight module described in any one of preceding contents.

In an example of this embodiment, as shown inFIG.1, a third rectangular annular step123may be provided on an end face of the plastic frame12facing away from the back plate11, the display panel51is located on an inner side of the plastic frame12, and a portion of a surface of the display panel51facing away from a display side surface close to an outer edge thereof is disposed toward the third rectangular annular step123. Exemplarily, a double-sided tape may be provided on the third rectangular annular step123to fix the display panel51, or the display panel51may not be fixed with the third rectangular annular step123, and a buffer layer may be provided on the third rectangular annular step123to protect the display panel51. The display panel51may be a liquid crystal display panel or the like.

Exemplarily, as shown inFIG.1, the display module may further include a fixation frame41connected with the backlight module, the fixation frame41includes a frame plate411, wherein the frame plate411abuts against an end face of the plastic frame12facing away from the back plate11and is located at a portion of a display surface of the display panel51close to an outer edge thereof. In this way, the portion of the display panel51close to the outer edge may be clamped and fixed by the frame plate411of the fixation frame41and the third rectangular annular step123of the plastic frame12. Exemplarily, the fixation frame41may further include a baffle plate412connected with an outer peripheral edge of the frame plate411, and the baffle plate412may be snapped and fixed with the side plate112of the back plate11through a snap structure, for example, a clamping groove may be provided on the baffle plate412, and a snap matched with the clamping groove may be provided on the side plate112of the back plate11.

A display apparatus is further provided in an embodiment of the present disclosure, which includes the display module described in any of the aforementioned embodiments. The display apparatus may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a laptop computer, a digital photo frame, and a navigator.

In the accompanying drawings, a size of a constituent element, and a thickness of a layer or a region are sometimes exaggerated for clarity. Therefore, an implementation of the present disclosure is not necessarily limited to the size, and the shape and size of each component in the drawings do not reflect an actual scale. In addition, the drawings schematically illustrate some examples, and an implementation of the present disclosure is not limited to the shapes or numerical values shown in the drawings.

In the description herein, “parallel” refers to a state in which an angle formed by two straight lines is above −10° and below 10°, and thus also includes a state in which the angle is above −5° and below 5°. In addition, “vertical” refers to a state in which an angle formed by two straight lines is above 80° and below 100°, and thus also includes a state in which the angle is above 850 and below 95°.

In the specification, for convenience, wordings indicating orientation or positional relationships, such as “middle”, “upper”, “lower”, “front”, “back”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, and “outside”, are used for illustrating positional relationships between constituent elements with reference to the drawings, and are merely for facilitating the description of the specification and simplifying the description, rather than indicating or implying that a referred apparatus or element must have a particular orientation and be constructed and operated in the particular orientation. Therefore, they cannot be understood as limitations on the present disclosure. The positional relationships between the constituent elements may be changed as appropriate according to directions for describing the various constituent elements. Therefore, appropriate replacements may be made according to situations without being limited to the wordings described in the specification.

In the description herein, unless otherwise specified and defined explicitly, terms “connection”, “fixed connection”, “installation” and “assembly” should be understood in a broad sense, and, for example, they may be a fixed connection, a detachable connection or an integrated connection; the terms “installation”, “connection” and “fixed connection” may be a direct connection, an indirect connection through intermediate components, or an inner communication between two components. For those ordinarily skilled in the art, meanings of the above terms in the embodiments of the present disclosure may be understood according to situations.