CN110095906B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN110095906B CN110095906B CN201910471977.4A CN201910471977A CN110095906B CN 110095906 B CN110095906 B CN 110095906B CN 201910471977 A CN201910471977 A CN 201910471977A CN 110095906 B CN110095906 B CN 110095906B
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- guide plate
- light guide
- light
- backlight module
- strip
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0086—Positioning aspects
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133314—Back frames
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight module and a display device, comprising: backplate, gluey frame, lamp strip and light guide plate, backplate and gluey frame form an accommodation space, and lamp strip and light guide plate are located the accommodation space, and the lamp strip includes: the light source module comprises a strip-shaped flexible circuit board and a plurality of light sources electrically connected to the strip-shaped flexible circuit board; at least one end of the strip-shaped flexible circuit board comprises a notch, and the notch divides the strip-shaped flexible circuit board into a bonding part and a folding part; the surface of one side, facing the back plate, of the bonding part is bonded with the back plate, and the partial surface, facing away from the back plate, of the bonding part is bonded with the light guide plate; the turning part turns over one side of the light incident surface of the light guide plate and is positioned between the light incident surface of the light guide plate and the rubber frame at the corresponding position. The folding part of the strip-shaped flexible circuit board can play a role in buffering between the light guide plate and the frame glue, and when the backlight module vertically falls, the influence of shearing force in two opposite directions on the strip-shaped flexible circuit board can be reduced, the lamp strip is prevented from being torn, and the reliability of the backlight module is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and particularly to a backlight module and a display device.
Background
With the higher and higher requirements of users on the display effect of the display screen, the display screen with narrow frame and high screen occupation ratio is more and more favored. In order to reduce the width of the lower frame of the display screen, one side of the lamp strip in the backlight is bonded with the back plate, the other side of the lamp strip is bonded with the light guide plate, and the lamp strip occupies a smaller space of the lower frame by adopting the connecting structure.
However, the backlight structure is easy to tear the light bar when the backlight falls, which causes poor drop reliability test.
Disclosure of Invention
The embodiment of the invention provides a backlight module and a display device, which are used for preventing a light bar from being torn and improving the reliability of the display device.
In a first aspect, an embodiment of the present invention provides a backlight module, including: the backlight module comprises a back plate, a rubber frame, a light bar and a light guide plate, wherein the back plate and the rubber frame form an accommodating space, the light bar and the light guide plate are positioned in the accommodating space, the light guide plate and the back plate are oppositely arranged, the light bar is positioned on the side face where a light incident face of the light guide plate is positioned, and the light incident face of the light guide plate is intersected with a light emergent face of the light guide plate;
wherein, the lamp strip includes: the light source module comprises a strip-shaped flexible circuit board and a plurality of light sources electrically connected to the strip-shaped flexible circuit board;
at least one end of the strip-shaped flexible circuit board comprises a notch, and the notch divides the strip-shaped flexible circuit board into a bonding part and a folding part; the surface of one side of the bonding part facing the back plate is bonded with the back plate, and the partial surface of one side of the bonding part facing away from the back plate is bonded with the light guide plate; the turnover part is turned over towards one side of the light incident surface of the light guide plate and is positioned between the light incident surface of the light guide plate and the rubber frame at the corresponding position.
In a possible implementation manner, in the backlight module provided in an embodiment of the present invention, a buffer member is disposed on a side of the folded portion facing the light guide plate.
In a possible implementation manner, in the backlight module provided in the embodiment of the present invention, the buffer member is located between the light incident surface of the light guide plate, the side surface adjacent to the light incident surface, and the rubber frame in the corresponding position.
In a possible implementation manner, in the backlight module provided in the embodiment of the present invention, the buffer member is made of at least one material of foam, plastic, double-sided adhesive material, or single-sided adhesive material.
In a possible implementation manner, in the backlight module provided in the embodiment of the present invention, a surface of the buffering member facing one side of the light guide plate and a light incident surface of the light guide plate form a set included angle.
In a possible implementation manner, in the backlight module provided in the embodiment of the present invention, the set included angle is in a range of 15 to 45 degrees.
In a possible implementation manner, in the backlight module provided in an embodiment of the present invention, an ink layer is disposed on a surface of the buffer member facing the light guide plate.
In a possible implementation manner, in the backlight module provided in the embodiment of the present invention, the notch of the strip-shaped flexible circuit board is a polygonal notch.
In a possible implementation manner, in the backlight module provided in the embodiment of the present invention, the notch of the strip-shaped flexible circuit board is a parallelogram notch.
In a possible implementation manner, in the backlight module provided in the embodiment of the present invention, a length of the parallelogram notch along an extending direction of the light bar is 0.3-0.5 mm.
In a possible implementation manner, in the backlight module provided in the embodiment of the present invention, a length of the parallelogram notch along a direction perpendicular to an extending direction of the light bar is 4 to 5 times a length of the parallelogram notch along the extending direction of the light bar.
In a second aspect, an embodiment of the present invention provides a display device, including: the backlight module comprises any one of the backlight modules and a display panel positioned on the light-emitting side of the backlight module.
The invention has the following beneficial effects:
the backlight module and the display device provided by the embodiment of the invention comprise: the light guide plate is arranged opposite to the back plate, the light bar is positioned on the side face where the light incident surface of the light guide plate is positioned, and the light incident surface of the light guide plate is intersected with the light emergent surface of the light guide plate; wherein, lamp strip includes: the light source module comprises a strip-shaped flexible circuit board and a plurality of light sources electrically connected to the strip-shaped flexible circuit board; at least one end of the strip-shaped flexible circuit board comprises a notch, and the notch divides the strip-shaped flexible circuit board into a bonding part and a folding part; the surface of one side, facing the back plate, of the bonding part is bonded with the back plate, and the partial surface, facing away from the back plate, of the bonding part is bonded with the light guide plate; the turning part turns over one side of the light incident surface of the light guide plate and is positioned between the light incident surface of the light guide plate and the rubber frame at the corresponding position. When adopting backlight unit of structure like this when falling the test, because the both sides of lamp strip all adhere different parts, the lamp strip can receive vertical decurrent gravity and with the influence of gravity opposite direction's bonding pulling force when falling, form the shearing force that the atress opposite direction of destroying the lamp strip structure. The turning part of the strip-shaped flexible circuit board is arranged between the light guide plate and the frame glue, so that the back light module can play a role in buffering when the back light module freely falls, the influence of shearing force in two opposite directions on the strip-shaped flexible circuit board is reduced, the lamp strip is prevented from being torn, and the reliability of the back light module is improved.
Drawings
Fig. 1 is a schematic top view of a backlight module according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the backlight module along the direction II' in FIG. 1;
fig. 3 is a force diagram of a light bar in a drop test according to an embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of the structure within the circular dashed box of FIG. 1;
fig. 5 is a schematic top view of a light bar according to an embodiment of the present invention;
FIG. 6 is an enlarged view of a portion of the structure within the dashed rectangle of FIG. 5;
FIG. 7 is a schematic structural view of a bonding portion and a folding portion provided in an embodiment of the present invention;
fig. 8 is a second schematic top view of a backlight module according to an embodiment of the present invention;
fig. 9 is a third schematic top view of a backlight module according to an embodiment of the present invention;
FIG. 10 is a fourth schematic view illustrating a top view structure of a backlight module according to an embodiment of the present invention;
FIG. 11 is a schematic cross-sectional view of a buffer structure according to an embodiment of the present invention;
fig. 12 is a second schematic top view of the light bar according to the embodiment of the invention;
fig. 13 is a schematic top view of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are for illustrative purposes only and do not represent true scale.
It should be noted that in the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
The backlight module and the display device provided by the embodiment of the invention are specifically described below with reference to the accompanying drawings. The thicknesses and shapes of the respective components in the drawings do not reflect the true scale of the display device, and are merely intended to schematically illustrate the present invention.
Referring to fig. 1, fig. 1 is a schematic top view structure diagram of a backlight module according to an embodiment of the present invention, the backlight module includes: the back plate 11, the rubber frame 12, the lamp strip 13 and the light guide plate 14, the back plate 11 and the rubber frame 12 form an accommodating space, and the lamp strip 13 and the light guide plate 14 are located in the accommodating space.
As shown in fig. 2, fig. 2 is a cross-sectional view of the backlight module taken along a direction II' corresponding to the position of the light bar in fig. 1, the light guide plate 14 is disposed opposite to the back plate 11, the light bar is disposed on a side surface where a light incident surface of the light guide plate 14 (e.g., a left side surface of the light guide plate 14 in fig. 2) is located, and the light incident surface of the light guide plate 14 intersects with a light emitting surface of the light guide plate (e.g., an upper surface of the light guide plate 14 in fig. 2). Wherein, lamp strip includes: a strip-shaped flexible circuit board 131 and a plurality of light sources 132 electrically connected on the strip-shaped flexible circuit board 131.
As shown in fig. 3, fig. 3 is a schematic diagram of stress of the light bar when the backlight module shown in fig. 2 is subjected to a vertical and downward drop test. As shown in fig. 3, the surface of the strip-shaped flexible circuit board 131 facing the back plate 11 is adhered to the back plate 11, and the surface of the strip-shaped flexible circuit board 131 facing the lower surface of the light guide plate is adhered to the lower surface of the light guide plate. When the backlight module falls along the direction of the vertical downward arrow in fig. 3, since different parts are adhered to two sides of the light bar, the light bar is influenced by the vertical downward gravity fg and the adhesion pull fl opposite to the gravity, and is subjected to a shear force in the opposite direction.
As shown in fig. 4, fig. 4 is a partial enlarged view of the structure in the dashed line frame in fig. 1, and a certain gap G exists between the frame glue 12 and the light guide surface (the lower surface in fig. 4) of the light guide plate 14 at the two side edge positions. Referring to fig. 5 and 5, which are schematic top view structures of a light bar according to an embodiment of the present invention, at least one end of a strip-shaped flexible circuit board 131 of the light bar in the embodiment of the present invention is provided with a notch C. Fig. 6 is a schematic structural view of the enlarged structure in the rectangular dashed line frame in fig. 5, as shown in fig. 6, a notch C at the end of the strip-shaped flexible circuit board 131 divides the strip-shaped flexible circuit board 131 into an adhesive portion 1311 and a folded portion 1312; in specific implementation, the bonding portion 1311 is used for bonding the light bar to the back panel 11 and the light guide plate 14, the surface of the bonding portion 1311 facing the back panel is bonded to the back panel 11, and the part of the surface of the bonding portion 1311 facing away from the back panel is bonded to the light guide plate 14; the folded portion 1312 may be folded toward a side perpendicular to the bonding portion 1311, the structure of the strip-shaped flexible circuit board 131 after being folded is shown in fig. 7, and fig. 7 is a schematic structural diagram of the bonding portion and the folded portion. In an embodiment of the present invention, as shown in fig. 8, fig. 8 is a schematic top view structure diagram of another backlight module according to an embodiment of the present invention, the strip-shaped flexible circuit board 131 can be folded over the folded portion 1312 to one side of the light incident surface of the light guide plate 14, and the folded portion 1312 is disposed in a gap G between the light incident surface of the light guide plate 14 and the glue frame 12 at the corresponding position; the bonding portion of the strip-shaped flexible circuit board is still bonded to the surface of the back plate and the lower surface of the light guide plate 14. Thus, when the backlight module falls down along the vertical downward direction, the turning portion 1312 of the strip-shaped flexible circuit board, which is positioned in the gap between the light guide plate and the frame sealant at the moment of bottoming, can buffer the light bar, so that the influence of gravity and bonding tension opposite to the gravity on the light bar can be relieved, the light bar is prevented from being torn, and the reliability of the backlight module is improved.
In a specific implementation, a Light bar in the backlight module may use a Light Emitting Diode (LED) as the Light source 132, and the Light Emitting Diode is soldered on the strip-shaped flexible circuit board 131, such that the Light Emitting surface of the Light Emitting Diode faces the Light incident surface of the Light guide plate, i.e., the Light Emitting surface of the Light Emitting Diode is perpendicular to the plane of the bonding portion 1311 of the strip-shaped flexible circuit board. Because the corner positions of the two sides of the light incident surface of the light guide plate and the frame glue have gaps, the light intensity of the light emitted by the light emitting diode at the gaps is different from the light intensity of the light incident to other positions of the light incident surface of the light guide plate, so that the incident light intensity is uneven, and the problem of uneven light emission of a display area is caused. In the embodiment of the present invention, as shown in fig. 5, a notch C is disposed at each of two ends of the strip-shaped flexible circuit board 131 to form a turning portion 1312 located at two sides and a bonding portion 1311 located in the middle, the bonding portion 1311 is still used for bonding the light bar with the back plate and the light guide plate, and the turning portions 1312 at two sides are folded toward the light incident surface side of the light guide plate and are respectively disposed in the gaps between the light guide plate and the sealant at two corners. The turning-over portion 1312 may block the light incident surface of the light guide plate at the gap position, so that the light emitted from the light emitting diode is only incident on other positions of the light incident surface of the light guide plate, thereby improving the phenomenon of non-uniform light emission of the display region, and facilitating optimization of the display effect of the display device.
In the actual assembly process, notches C may be formed at two ends of the strip-shaped flexible circuit board 131 of the light bar to form a bonding portion 1311 and a folded portion 1312, one surface of the bonding portion 1311 is bonded and pressed to the lower surface of the light guide plate, and the folded portion 1312 is folded toward the light incident surface of the light guide plate, so that the surface of the folded portion 1312 is close to two corner positions of the light incident surface of the light guide plate; and reversely assembling the assembled lamp strip and the light guide plate into a back plate with a rubber frame, enabling the turnover part 1312 to be positioned between the light incident surface of the light guide plate at the corner and the gap of the corresponding rubber frame, and bonding the surface on the other side of the bonding part 1311 with the back plate 11.
Referring to fig. 9 and fig. 9 being a schematic top view of another backlight module according to an embodiment of the invention, in order to enhance the buffering effect between the light guide plate and the sealant, as shown in fig. 9, a buffering member 15 is disposed on a side of the turning portion 1312 facing the light guide plate 14 according to an embodiment of the invention. The buffer member 15 can be made of at least one material selected from foam, plastic, double-sided adhesive material or single-sided adhesive material. The buffer component 15 is additionally arranged in the gap between the light guide plate 14 and the frame glue 12, so that the dislocation between the light guide plate 14 and the frame glue 12 caused by inertia when the backlight module falls off can be avoided, the lamp strip is prevented from being torn under the action of shearing force, and the reliability of the backlight module is improved. In practical application, the buffer component may be made of a material with certain elasticity, and a material with high elasticity such as foam, plastic, etc., such as Polyethylene (PE) or polyethylene terephthalate (PET), etc., may be used; in addition, a sticky material can be directly adhered to the folded part 1312 of the strip-shaped flexible circuit board 131, so that the problems of dislocation and falling between the folded part 1312 and the buffer member 15 are avoided. In addition to the above materials, other elastic or adhesive materials may be used to manufacture the buffer member, which is not limited herein.
In a specific implementation, as shown in fig. 10, fig. 10 is a schematic top view structure diagram of another backlight module according to an embodiment of the present invention, a buffer member 15 may be disposed between the light incident surface of the light guide plate 14, the side surface adjacent to the light incident surface, and the rubber frame at the corresponding position. The buffer parts 15 are arranged at the gap positions between the two side faces of the light guide plate at the corner position and the frame glue, the coverage range of the buffer parts 15 is enlarged, the corners of the light guide plate can be fully protected, and the problems that the light guide plate is broken due to impact of external force when the light guide plate falls off and the like are solved.
Further, as shown in fig. 11 and fig. 11 is a schematic cross-sectional view of the backlight module according to the embodiment of the invention, a surface of the buffer member 15 facing the light guide plate and a light incident surface of the light guide plate 14 may be set to form a set included angle α. It is understood that, when a free fall drop test is performed, the cushioning effect of the light guide plate 14 falling on the elastic member whose contact surface is an inclined surface is superior to the cushioning effect falling on the elastic member whose contact surface is a flat surface. Therefore, in the embodiment of the present invention, the surface of the buffer member 15, which is in contact with the light incident surface of the light guide plate 14, is set to be an inclined surface, so as to achieve the purpose of enhancing the buffering effect.
In the actual assembly process, notches C may be formed at two ends of the strip-shaped flexible circuit board 131 of the light bar to form the bonding portion 1311 and the folding portion 1312. Attaching a buffer member 15 to a surface of one side of the folded portion 1312, bonding and pressing one surface of the bonding portion 1311 to a lower surface of the light guide plate, and folding the folded portion 1312 over the light incident surface of the light guide plate so that the surface of the folded portion 1312 with the buffer member 15 is close to two corner positions of the light incident surface of the light guide plate; and reversely assembling the assembled lamp strip and the light guide plate into a back plate with a rubber frame, enabling the turnover part 1312 to be positioned between the light incident surface of the light guide plate at the corner and the gap of the corresponding rubber frame, and bonding the surface on the other side of the bonding part 1311 with the back plate 11.
In practical applications, the set included angle α between the surface of the buffer member 15 facing the light guide plate and the light incident surface of the light guide plate 14 may be set within a range of 15-45 degrees. For example, when the included angle between the surface of the buffer member 15 facing the light guide plate and the light incident surface of the light guide plate 14 is 15 degrees, the thickness of the buffer member 15 may be set to be relatively thin, which is beneficial to reducing the gap G between the light guide plate and the rubber frame. When the angle between the surface of the buffer member 15 facing the light guide plate and the light incident surface of the light guide plate 14 is 45 degrees, the buffer member 15 can fully contact the light incident surface of the light guide plate when being disposed in the gap G, and the interaction force between the buffer member 15 and the light guide plate can optimize the buffer effect of the buffer member 15. Of course, the included angle between the surface of the buffer member 15 facing the light guide plate and the light incident surface of the light guide plate 14 may be set to any angle between 15 degrees and 45 degrees, for example, the α angle may be set to 30 degrees, and an appropriate α angle may be selected according to actual needs, which is not limited herein. The value range of the included angle alpha is an empirical value obtained through testing, and the condition that the set included angle is set within the range or slightly exceeds the range in practical application also belongs to the protection range of the invention. The embodiment of the invention does not limit the specific value of the included angle.
The edge of the display area of the special-shaped display screen at the corner position is usually set to be in a circular arc shape, and because the brightness difference between the display area and the non-display area is large, poor shadow display usually occurs at the corner position. In the embodiment of the present invention, an ink layer may be disposed on a surface of the buffer member 15 facing the light guide plate 14. The reflection of light can be enhanced at the corner position by adopting white ink or gradient ink, so that the brightness difference of the display area and the non-display area at the corner position is reduced, and the problem of optical shadow is solved.
In a specific implementation, as shown in fig. 6, the notches C on two sides of the strip-shaped flexible circuit board 131 may be polygonal notches. The shape of the notch C can be set according to actual needs, as shown in FIG. 6, the notch C of the strip-shaped flexible circuit board can be a parallelogram notch, and the requirement of the parallelogram notch on the manufacturing process is low, so that the manufacturing is facilitated. Considering the size of the light bar in practical application, the length w of the parallelogram notch along the extending direction of the light bar can be set to be 0.3-0.5mm, and the length of the parallelogram notch along the direction perpendicular to the extending direction of the light bar is 4-5 times of the length of the parallelogram notch along the extending direction of the light bar. In practical application, the width and the length of lamp strip are all limited, and the breach occupies too much space, will lead to the available region's of lamp strip reduction, consequently need rationally set up the size of breach, under the prerequisite that does not influence strip flexible circuit board's normal performance, can set up the breach and be 0.3mm, 0.4mm or 0.5mm along lamp strip extending direction's length w. It can be understood that the smaller the width of the notch is, the larger the available area for wiring in the strip-shaped flexible circuit board is, and the larger the width of the notch is, the lower the requirement on the process precision of forming the notch is, which is more beneficial to the turnover and movement of the turnover part. In specific implementation, the size of the notch needs to be set by considering various factors such as the size of the light bar, the size between the light guide plate and the frame glue, the precision of the piece printing process and the like, and the embodiment of the invention does not limit the specific size of the notch of the flexible circuit board.
In addition, the notches C formed in the two sides of the strip-shaped flexible circuit board may be formed in other shapes, as shown in fig. 12, fig. 12 is a schematic view of a notch structure provided in the embodiment of the present invention, and the notches C of the strip-shaped flexible circuit board may be formed as V-shaped notches, as shown in fig. 12, if the notches C are formed in V-shape, the notches C are cut only at one side close to the light source 132, so that the main area where the notches are located is obliquely cut toward the side away from the light source 132, and thus the risk of damage to the circuit board at one side close to the light emitting diode due to cutting can be avoided, and the V-shaped notches between the folded portion 1312 and the bonding portion 1311 widen the distance therebetween, so that the folded portion can be folded more flexibly. The notches may be provided in other patterns than those illustrated in the embodiments of the present invention, and are not further described herein.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises any one of the backlight modules and a display panel positioned on the light-emitting side of the backlight module. The display device may be a display device such as a liquid crystal panel, a liquid crystal display, a liquid crystal television, or a mobile phone, as shown in fig. 13, fig. 13 is a schematic view of a top view structure of the display device, a mobile terminal device such as a tablet computer, an electronic album, and the like, which is not limited herein. Because the principle of the display device for solving the problems is similar to that of the backlight module, the implementation of the display device can be referred to that of the backlight module, and repeated details are not repeated.
The backlight module and the display device provided by the embodiment of the invention comprise: the light guide plate is arranged opposite to the back plate, the light bar is positioned on the side face where the light incident surface of the light guide plate is positioned, and the light incident surface of the light guide plate is intersected with the light emergent surface of the light guide plate; wherein, lamp strip includes: the light source module comprises a strip-shaped flexible circuit board and a plurality of light sources electrically connected to the strip-shaped flexible circuit board; at least one end of the strip-shaped flexible circuit board comprises a notch, and the notch divides the strip-shaped flexible circuit board into a bonding part and a folding part; the surface of one side, facing the back plate, of the bonding part is bonded with the back plate, and the partial surface, facing away from the back plate, of the bonding part is bonded with the light guide plate; the turning part turns over one side of the light incident surface of the light guide plate and is positioned between the light incident surface of the light guide plate and the rubber frame at the corresponding position. When adopting backlight unit of structure like this when falling the test, because the both sides of lamp strip all adhere different parts, the lamp strip can receive vertical decurrent gravity and with the influence of gravity opposite direction's bonding pulling force when falling, form the shearing force that the atress opposite direction of destroying the lamp strip structure. The turning part of the strip-shaped flexible circuit board is arranged between the light guide plate and the frame glue, so that the back light module can play a role in buffering when the back light module freely falls, the influence of shearing force in two opposite directions on the strip-shaped flexible circuit board is reduced, the lamp strip is prevented from being torn, and the reliability of the back light module is improved.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (12)
1. A backlight module, comprising: the backlight module comprises a back plate, a rubber frame, a light bar and a light guide plate, wherein the back plate and the rubber frame form an accommodating space, the light bar and the light guide plate are positioned in the accommodating space, the light guide plate and the back plate are oppositely arranged, the light bar is positioned on the side face where a light incident face of the light guide plate is positioned, and the light incident face of the light guide plate is intersected with a light emergent face of the light guide plate;
wherein, the lamp strip includes: the light source module comprises a strip-shaped flexible circuit board and a plurality of light sources electrically connected to the strip-shaped flexible circuit board;
at least one end of the strip-shaped flexible circuit board comprises a notch, and the notch divides the strip-shaped flexible circuit board into a bonding part and a folding part; the surface of one side of the bonding part facing the back plate is bonded with the back plate, and the partial surface of one side of the bonding part facing away from the back plate is bonded with the light guide plate; the turnover part is turned over towards one side of the light incident surface of the light guide plate and is positioned between the light incident surface of the light guide plate and the rubber frame at the corresponding position.
2. The backlight module according to claim 1, wherein a buffer member is disposed on a side of the folded portion facing the light guide plate.
3. The backlight module as claimed in claim 2, wherein the buffer member is disposed between the light incident surface of the light guide plate, the side surface adjacent to the light incident surface, and the corresponding plastic frame.
4. The backlight module as claimed in claim 2, wherein the buffer member is made of at least one of foam, plastic, double-sided adhesive material or single-sided adhesive material.
5. The backlight module as claimed in claim 2, wherein a surface of the buffer member facing the light guide plate forms a predetermined angle with the light incident surface of the light guide plate.
6. The backlight module as claimed in claim 5, wherein the set angle is in the range of 15-45 degrees.
7. The backlight module according to claim 2, wherein a surface of the buffer member facing the light guide plate is provided with an ink layer.
8. The backlight module according to any one of claims 1-7, wherein the notches of the strip-shaped flexible circuit boards are polygonal notches.
9. The backlight module according to claim 8, wherein the notches of the strip-shaped flexible circuit boards are parallelogram notches.
10. The backlight module as claimed in claim 9, wherein the length of the parallelogram notch along the extending direction of the light bar is 0.3-0.5 mm.
11. The backlight module of claim 10, wherein the length of the parallelogram notch along the direction perpendicular to the extending direction of the light bar is 4-5 times the length of the parallelogram notch along the extending direction of the light bar.
12. A display device, comprising: the backlight module according to any of claims 1-11, and a display panel on the light exit side of the backlight module.
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| CN111208674B (en) * | 2020-02-28 | 2022-07-12 | 京东方科技集团股份有限公司 | Backlight module, display device and assembling method of backlight module |
| CN111458784B (en) * | 2020-05-13 | 2022-01-11 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN113759603B (en) * | 2021-09-08 | 2023-05-12 | 京东方科技集团股份有限公司 | Backlight module and display device |
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| CN110095906A (en) | 2019-08-06 |
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