CN111679505A

CN111679505A - Backlight module and vehicle-mounted display

Info

Publication number: CN111679505A
Application number: CN202010600548.5A
Authority: CN
Inventors: 肖士元
Original assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Current assignee: Wuhan China Star Optoelectronics Technology Co Ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2020-09-18

Abstract

The embodiment of the application provides a backlight unit and vehicle-mounted display, backlight unit includes the center in this application, LED lamp strip, light guide plate and back of the body frame, LED lamp strip sets firmly in the inboard of the curb plate of back of the body frame, the light guide plate is located and is held the intracavity, the light guide plate is provided with fixed connector towards back of the body frame one side, so that light guide plate and back of the body frame structure as an organic whole, can ensure that the vehicle is at the vibration in-process that makes a round trip, light guide plate and optical film material can not take place to slide in four sides and heart position among the backlight unit, keep relative position unchangeable between light guide plate and the optical film material, thereby improve vehicle-mounted display's the stability of demonstration.

Description

Backlight module and vehicle-mounted display

Technical Field

The application relates to a folding display technology field, especially relates to a backlight module and vehicle-mounted display.

Background

Along with the gradual development of on-vehicle electronic technology, the demand of on-vehicle electronic product is increasing more and more at present, along with the car more and more as the instrument that the modern moved instead of walk, the vehicle demonstrates vibration from top to bottom on the road, requires that the high reliability requirement of on-vehicle display module assembly also is higher and higher.

The common vehicle-mounted display mainly comprises a backlight module and a display module, wherein the backlight module comprises a back plate, a reflector plate positioned in the back plate, a light source positioned on the surface of the reflector plate, a light guide plate positioned on the surface of the light source, and an optical film positioned on the surface of the light guide plate. Along with the vibration back and forth of the vehicle, the backlight module usually can generate relative motion in the horizontal and vertical directions, the light guide plate and the optical film material slide at four sides and the center position, even bounce along the vertical direction, and relative displacement friction exists between the light guide plate and the optical film material, so that the white spot phenomenon of the backlight module occurs during vibration, the use feeling is influenced, the user satisfaction is reduced, and improvement is needed.

Disclosure of Invention

The embodiment of the application provides a backlight unit and vehicle-mounted display, can solve among the prior art backlight unit and can take place relative motion in horizontal and vertical direction usually, light guide plate and optical film material take place to slide in four sides and heart position, beat along the vertical direction even, lead to having relative displacement friction between light guide plate and the optical film material to the white spot phenomenon appears in backlight unit when the vibration, influence the use and feel, reduce the technical problem of user's satisfaction.

In order to solve the above problems, the technical scheme provided by the invention is as follows:

the embodiment of the application provides a backlight unit, including the back of the body frame and being located light guide plate in the back of the body frame, the light guide plate orientation back of the body frame one side is provided with fixed connector, so that the light guide plate with back of the body frame structure as an organic whole.

In the backlight module of this application, fixed connector is including locating the first elasticity trip of the multiunit at light guide plate edge with locate the second elasticity trip that light guide plate central point put, the setting of the first elasticity trip of every group is in on the edge that the light guide plate stands mutually, the back of the body frame includes the bottom plate and is located bottom plate edge and perpendicular to the curb plate of bottom plate, the bottom plate is including locating the first locating hole of multiunit at bottom plate edge with locate the second locating hole that bottom plate central point put, every first locating hole of group sets up on the edge that the bottom plate stands mutually, first elasticity trip inserts in the first locating hole, second elasticity trip card is held in the second locating hole.

In the backlight module of this application, the one end laminating of first elasticity trip in the surface of light guide plate, the other end of first elasticity trip inserts in the first locating hole, be used for fixing the displacement of the X axle direction of light guide plate.

In the backlight module of this application, first elasticity trip is cuboid or cylinder, first locating hole be with this cuboid or cylinder matched with through-hole.

In the backlight module of this application, second elasticity trip includes base member and the portion of zooming, the base member laminate in the surface of light guide plate, the portion of zooming is when the compression, the width of the portion of zooming equals or is less than the width of base member, the portion of zooming is when free state, the width of the portion of zooming is greater than the width of base member, just the middle cavity that has of the portion of zooming is convenient for the inside shrink in portion both sides of zooming, the counter bore of second locating hole for having the step, the portion of zooming both sides card is held on the step, is used for fixing the displacement of the Y axle direction of light guide plate.

In the backlight module of the present application, the second elastic hook has a shape that the base body inclines or bends toward a center line of the zooming portion.

In the backlight module of this application, the light guide plate with be provided with the reflector plate between the bottom plate, the reflector plate corresponds first elasticity trip with the position of second elasticity trip is provided with the through-hole.

In the backlight module of this application, fixed connection spare still including being located four angles of light guide plate with rubber block between the curb plate, the shape of rubber block with the outline shape on light guide plate angle limit is the same, the rubber block passes through interference fit restriction the displacement of light guide plate.

In the backlight module of this application, backlight unit still includes LED lamp strip and is located the light guide plate is kept away from the optical film material of back of the body frame one side, the light guide plate is close to one side of LED lamp strip is equipped with avoids the breach of LED lamp strip, the curb plate is the plane board, LED lamp strip bonds through heat-conducting glue on the curb plate, the light guide plate will the horizontal light of LED lamp strip outgoing turns into vertically light.

According to the backlight module, the application also provides a vehicle-mounted display, including above-mentioned backlight module, be located the liquid crystal display panel on backlight module surface and being located the protection apron on liquid crystal display panel surface, wherein, backlight module is close to liquid crystal display panel one side is provided with the annular center, is used for fixing liquid crystal display panel.

Has the advantages that: the embodiment of the application provides a backlight unit and vehicle-mounted display, backlight unit includes the center in this application, LED lamp strip, light guide plate and back of the body frame, LED lamp strip sets firmly in the inboard of the curb plate of back of the body frame, the light guide plate is located and is held the intracavity, the light guide plate is provided with fixed connector towards back of the body frame one side, so that light guide plate and back of the body frame structure as an organic whole, can ensure that the vehicle is at the vibration in-process that makes a round trip, light guide plate and optical film material can not take place to slide in four sides and heart position among the backlight unit, keep relative position unchangeable between light guide plate and the optical film material, thereby improve vehicle-mounted display's the stability of demonstration.

Drawings

In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of a cross-sectional structure of a backlight module taken along an X-axis direction according to an embodiment of the present disclosure.

Fig. 2 is a schematic view of a cross-sectional structure of a backlight module along a Y-axis direction according to an embodiment of the present disclosure.

Fig. 3 is a schematic view of a bottom plate structure of a backlight module according to an embodiment of the present disclosure.

Fig. 4 is a schematic view of another bottom plate structure of a backlight module according to an embodiment of the present disclosure.

Fig. 5 is a schematic view of an LED light bar structure of a backlight module according to an embodiment of the present disclosure.

Fig. 6 is a schematic view illustrating light propagation in a light guide plate and a light source of a backlight module according to an embodiment of the present disclosure.

Fig. 7 is a structural schematic diagram of a vehicle-mounted display cut along an X-axis direction according to an embodiment of the present application.

Fig. 8 is a structural schematic diagram of a vehicle-mounted display cut along the Y-axis direction according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

This application can take place relative motion in horizontal and vertical direction to backlight unit among the prior art usually, and light guide plate and optical film material take place to slide in four sides and heart position, beat along the vertical direction even, lead to having the relative displacement friction between light guide plate and the optical film material to the white spot phenomenon appears in backlight unit when the vibration, the influence is used and is felt, reduces the technical problem of user satisfaction, and this defect can be solved in this application.

As shown in fig. 1 and 2, an embodiment of the present application provides a backlight module 100, where the backlight module 100 includes a back frame 101, an LED light bar 102, a light guide plate 104, an optical film 106, and a middle frame 107, the back frame 101 includes a bottom plate 1011, a right side plate 1012 and a left side plate 1013 on two sides of the bottom plate 1011, the middle frame 107 includes a right middle frame 1071 and a left middle frame 1072, the right middle frame 1071 is attached to an inner surface of the right side plate 1012, the left middle frame 1072 is attached to an inner surface of the left side plate 1013, and the right middle frame 1071 and the left middle frame 1072 are used for placing a corresponding display module. Right side board 1012, left side board 1013 and bottom plate 1011 form and hold the chamber, light guide plate 104 and optical film material 106 all set up and hold in the chamber, and be the rectangle, LED lamp strip 102 sets firmly in left side board 1013 inboard, one side that light guide plate 104 is close to LED lamp strip is equipped with the breach of avoiding LED lamp strip, left side board 1013 is the plane board, LED lamp strip 102 bonds on left side board 1013 through heat-conducting glue, LED lamp strip 102 can also set up on right side board 1013, specific position does not do the injectly, but LED lamp strip 102's height and light guide plate 104's high parallel and level, the horizontal light that light guide plate 104 of being convenient for incides LED lamp strip 102 turns into vertically light. In this embodiment, the optical film 106 includes a diffuser plate 1061, a prism sheet 1062 and a brightness enhancement film 1063, and the diffuser plate 1061, the prism sheet 1062 and the brightness enhancement film 1063 are used to make the incident light emitted from the light guide plate 104 undergo multiple refractions, reflections and scatters, so as to condense the emitted divergent light to exit in a predetermined range, and improve the brightness of the backlight module 100.

In order to solve the technical problems that when a vehicle vibrates in the process of movement, a backlight module in a vehicle-mounted display usually moves horizontally and vertically relative to each other to cause the light guide plate and the optical film to slide at four sides and a center position, even to bounce along the vertical direction, so that a relative displacement difference exists between the light guide plate and the optical film, and the backlight module generates a white spot phenomenon during vibration, and the satisfaction of a user is reduced, the application arranges a fixed connecting piece 105 at one side of the light guide plate 104 facing a back frame 101 to enable the light guide plate and the back frame to be an integrated structure, thereby achieving the purpose that the light guide plate 104 is limited and fixed inside the backlight module 100, ensuring that the light guide plate 104 and the optical film 106 in the backlight module 100 cannot slide at the four sides and the center position and keeping the relative position between the light guide plate 104 and the optical film 106 unchanged during the back-and forth vibration of the vehicle, the white spot phenomenon can not appear because of rubbing powder fall between light guide plate 104 and the optical film material 106, has guaranteed the reliable performance requirement of the expend with heat and contract with cold of light guide plate 104 simultaneously to improve the stability of the light-emitting of on-vehicle backlight unit 100, promote user and use experience and satisfaction, strengthened backlight unit 100's market competition.

As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the fixing connector 105 includes a plurality of sets of first elastic hooks 1051 disposed at the edge of the light guide plate 104 and a second elastic hook 1052 disposed at the center of the light guide plate 104, each set of first elastic hooks 1051 is disposed at the opposite edge of the light guide plate 104, the back frame 101 includes a bottom plate 1011 and a right side plate 1012 and a left side plate 1013 which are disposed at the edge of the bottom plate 1011 and perpendicular to the bottom plate 1011, a plurality of sets of first positioning holes 10115 are disposed at the edge of the bottom plate 1011, a second positioning hole 10116 is disposed at the center of the bottom plate 1011, each set of first positioning holes 10115 is disposed at the opposite edge of the bottom plate 1011, and the first positioning holes 10115 are through holes matched with the first elastic hooks 1051. The first positioning hole 10115 and the first elastic hook 1051 may be located at four corners or at the center of each side of the base plate 1011, or may be located at other positions with reference to fig. 3 and 4. In this embodiment, a reflective sheet 103 is further disposed between the light guide plate 104 and the bottom plate 1011, and through holes are disposed at positions of the reflective sheet 103 corresponding to the first elastic hook 1051 and the second elastic hook 1052.

One end of the first elastic hook 1051 is attached to the surface of the light guide plate 104, the other end of the first elastic hook 1051 is inserted into the first positioning hole 10115, the second elastic hook 1052 is clamped in the second positioning hole 10116, the first elastic hook 1051 comprises a first set of elastic hooks and a second set of elastic hooks, the first set of elastic hooks comprises a first bullet-shaped hook 10511 and a second bullet-shaped hook 10512, the first bullet-shaped hook 10511 and the second bullet-shaped hook 10512 are respectively oppositely arranged on the left side edge and the right side edge of the light guide plate 104, the second set of elastic hooks comprises a third bullet-shaped hook and a fourth bullet-shaped hook, and the third bullet-shaped hook and the fourth bullet-shaped hook are respectively oppositely arranged on the upper side edge and the lower side edge of the light guide plate 104. The first elastic hooks 1051 are preferably rectangular or cylindrical, the first positioning hole 10115 includes a first sub-positioning hole 10111, a second sub-positioning hole 10112, a third sub-positioning hole 10113, and a fourth sub-positioning hole 10114, the first sub-elastic hook 10511 and the second sub-elastic hook 10512 are respectively inserted into the first sub-positioning hole 10111 and the second sub-positioning hole 10112, and the third sub-elastic hook and the fourth sub-elastic hook are respectively inserted into the third sub-positioning hole 10113 and the fourth sub-positioning hole 10114, so as to limit the light guide plate 104 and the optical film 106 to slide on four sides, and improve the stability of the backlight module 100 on the X axis.

The second elastic hook 1052 includes a base and a contracting and enlarging part, the base is attached to the surface of the central position of the light guide plate 104, the contracting and enlarging part has a width equal to or less than that of the base in a compressing mode, the contracting and enlarging part has a width greater than that of the base in a free state, a cavity is arranged in the middle of the contracting and enlarging part, two sides of the contracting and enlarging part are convenient to contract inwards, the second elastic hook 1052 is preferably a boss in shape, and the cross section is formed by inclining or bending the base towards the central line of the contracting and enlarging part. The second positioning hole 10116 is a counter bore with a step, two sides of the zooming portion are clamped on the step for fixing the displacement of the light guide plate in the Y-axis direction, so as to limit the displacement of the center of the light guide plate 104, and the fixed light guide plate 104 and the optical film 106 slide in the center, thereby improving the stability of the backlight module 100 in the Y-axis direction.

In addition, as shown in fig. 2 and 5, the fixing connector 105 further includes rubber blocks 1053 located between four corners of the light guide plate 104 and the left and

right side plates

1013 and 1012, each of the rubber blocks 1053 includes a first sub rubber block 10531, a second sub rubber block 10532, a third sub rubber block 10533, and a fourth sub rubber block 10534, the sub rubber blocks have the same shape as the outer contour of the corner of the light guide plate 104, and have a vertical height exceeding the height of the light guide plate 104, and the displacement of the light guide plate 104 is restricted by interference fit. The LED light bar 102 is fixedly disposed on the inner side of the left side plate 1013, a notch is formed in one side of the light guide plate 104 close to the LED light bar to avoid the LED light bar, and the LED light bar 102 is just located in the notch. Specifically, as shown in fig. 6, the LED light bar 102 includes a light source 1021 and a light source 1022 disposed opposite to the light source 1021, the light source 1021 and the light source 1022 emit a horizontal light ray S11 and a horizontal light ray S12 respectively, the incident angle is converted by the light guide plate 104, and after the incident angle is changed by 90 degrees, a vertical light ray S13 is emitted from the light emitting surface.

According to the backlight module, as shown in fig. 7 and 8, the present application further provides an on-vehicle display 200, which includes the backlight module in the above embodiment, a liquid crystal panel 201 on the surface of the backlight module, and a protective cover 202 on the surface of the liquid crystal panel 201, wherein the protective cover 202 is preferably a glass substrate. The backlight module is provided with an annular middle frame 107 on one side close to the liquid crystal panel 201, the annular middle frame 107 comprises a right middle frame 1071 and a left middle frame 1072 for fixing the liquid crystal panel 201, and other structures in the backlight module and the reference numerals of the structures are the same as those in fig. 1 and 2, and are not repeated herein.

In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. The backlight module is characterized by comprising a back frame and a light guide plate positioned in the back frame, wherein one side of the light guide plate, which faces the back frame, is provided with a fixed connecting piece, so that the light guide plate and the back frame are of an integrated structure.

2. The backlight module as claimed in claim 1, wherein the fixing connector comprises a plurality of sets of first elastic hooks disposed at the edge of the light guide plate and a second elastic hook disposed at the center of the light guide plate, each set of first elastic hooks is disposed at the opposite edge of the light guide plate, the back frame comprises a bottom plate and a side plate disposed at the edge of the bottom plate and perpendicular to the bottom plate, the bottom plate comprises a plurality of sets of first positioning holes disposed at the edge of the bottom plate and a second positioning hole disposed at the center of the bottom plate, each set of first positioning holes is disposed at the opposite edge of the bottom plate, the first elastic hooks are inserted into the first positioning holes, and the second elastic hooks are retained in the second positioning holes.

3. The backlight module as claimed in claim 2, wherein one end of the first elastic hook is attached to the surface of the light guide plate, and the other end of the first elastic hook is inserted into the first positioning hole for fixing the displacement of the light guide plate in the X-axis direction.

4. The backlight module as claimed in claim 3, wherein the first elastic hook is a rectangular parallelepiped or a cylinder, and the first positioning hole is a through hole matching with the rectangular parallelepiped or the cylinder.

5. The backlight module as claimed in claim 2, wherein the second elastic hook comprises a base and a contracting and enlarging portion, the base is attached to the surface of the light guide plate, the contracting and enlarging portion has a width equal to or smaller than that of the base in a compressing mode, the contracting and enlarging portion has a width larger than that of the base in a free state, a cavity is formed in the middle of the contracting and enlarging portion to facilitate inward contraction of two sides of the contracting and enlarging portion, the second positioning hole is a counter bore with a step, and two sides of the contracting and enlarging portion are clamped on the step to fix the displacement of the light guide plate in the Y-axis direction.

6. The backlight module as claimed in claim 5, wherein the second elastic hook is shaped such that the base is inclined or curved toward a center line of the zooming portion.

7. The backlight module as claimed in claim 2, wherein a reflector plate is disposed between the light guide plate and the bottom plate, and through holes are disposed at positions of the reflector plate corresponding to the first elastic hooks and the second elastic hooks.

8. The backlight module as claimed in claim 2, wherein the fixing connectors further comprise rubber blocks disposed between four corners of the light guide plate and the side plates, the rubber blocks have the same shape as the outer contour of the corner edges of the light guide plate, and the rubber blocks limit the displacement of the light guide plate by interference fit.

9. The backlight module of claim 1, further comprising an LED light bar and an optical film material disposed on a side of the light guide plate away from the back frame, wherein a notch is formed on a side of the light guide plate close to the LED light bar to avoid the LED light bar, the side plate is a flat plate, the LED light bar is bonded to the side plate through a heat conducting adhesive, and the light guide plate converts horizontal light emitted from the LED light bar into vertical light.

10. An on-vehicle display, comprising the backlight module according to any one of claims 1 to 9, a liquid crystal panel on a surface of the backlight module, and a protective cover plate on a surface of the liquid crystal panel, wherein an annular middle frame is disposed on a side of the backlight module close to the liquid crystal panel for fixing the liquid crystal panel.