CN111308787A - Light bar, light bar packaging process, backlight module and display device - Google Patents
Light bar, light bar packaging process, backlight module and display device Download PDFInfo
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- CN111308787A CN111308787A CN202010269749.1A CN202010269749A CN111308787A CN 111308787 A CN111308787 A CN 111308787A CN 202010269749 A CN202010269749 A CN 202010269749A CN 111308787 A CN111308787 A CN 111308787A
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Optics & Photonics (AREA)
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Abstract
The invention belongs to the technical field of display equipment, and solves the technical problems of screen brightness reduction and light-emitting chip open circuit in the prior art. The invention provides a light bar, a light bar packaging process, a backlight module and display equipment. The light bar comprises a substrate and a plurality of light emitting chips; the light-emitting chips are fixed in the grooves of the reinforcing structure of the substrate at preset intervals, the grooves are filled with fluorescent glue, the stability of the light-emitting chips can be improved, and meanwhile, light rays of the light-emitting chips enter a target area after being emitted through the reflecting surfaces in the grooves; the light bar packaging process comprises the steps of molding and packaging the light bar; the backlight module comprises the lamp strip; the display device comprises the display device which emits light by using the backlight module. The LED display device has the advantages of good stability of the lamp strips, small space between the light-emitting chips, high utilization rate of luminous flux of the lamp strips and high display brightness of the display device.
Description
Technical Field
The invention relates to the technical field of display equipment, in particular to a light bar, a light bar packaging process, a backlight module and display equipment.
Background
Due to the development of the full-screen technology, people have higher and higher requirements on the display area of the mobile display device. The display screen scheme that the screen accounts for more highly receives the extensive concern of each house businessman, can increase the screen accounts for more through carrying out the narrow limit design to backlight unit, realizes the maximize that accounts for of display screen, and the mode that glues the frame through reducing to frame about to LCD display screen among the prior art realizes the design of narrow frame relatively easily with last frame, but the lower frame is because the existence of lamp strip extremely difficult realization narrow frame design.
In the prior art, as shown in fig. 1, a technical solution of patent No. CN108363240A discloses an integrally packaged backlight light bar solution, which realizes an ultra-narrow frame module design by improving a wiring manner and a light emitting manner. Specifically, the wiring of the light bar is arranged on the back of the substrate, meanwhile, the light emitting mode of the light bar is converted from side light emitting to top light emitting, the effect of omitting a rubber frame is achieved, and the light bar is arranged on the side back plate and occupies smaller frame width; compared with a traditional LED lamp strip, the LED light-emitting diode light-.
However, compared with the conventional LED light bar, as shown in fig. 2 and 3, the technical solution disclosed in patent No. CN108363240A is a point light source, the light bar in the prior art has a large light divergence angle, most of the light is absorbed by the side wall in the narrow-edge design, when the large divergence angle (equivalent to the vertical direction) is greater than 60 °, the light bar has a larger light intensity distribution, and the light intensity in the positive direction (+30 °) is relatively even, because the light intensity distribution is wide, the light utilization rate is low; as shown in fig. 5, since the light emitting chip 2 has a certain thickness, light emitted from a position far away from the light guide plate 5 in the light emitting chip 2, especially light with a large divergence angle (corresponding to a vertical direction) >60 °, is difficult to enter the light guide plate 8, wherein only light emitted from a plane parallel to the light incident plane 81 of the light guide plate 8 enters the light guide plate 8, and then exits from the light emergent plane 82 of the light guide plate 8 to be utilized, and the rest of the light is absorbed by the fixing plate 6, so the final luminance loss of the light bar is large, and the luminance loss of the display screen is about 30%.
Meanwhile, as shown in fig. 4, the light bar chip of the scheme adopts the CSP technology, and the light bar is long, so that the substrate and the fluorescent film are easily separated due to extrusion and stress during assembly and later use, thereby causing the light emitting chip to be broken and the lamp to be dead.
Disclosure of Invention
In view of this, embodiments of the present invention provide a light bar, a light bar packaging process, a backlight module and a display device, so as to solve the technical problems of screen brightness reduction and light emitting chip open circuit.
The technical scheme adopted by the invention is as follows:
the invention provides a light bar, which comprises a substrate and a plurality of light emitting chips;
the light bar is provided with a base plate, the base plate is provided with a reinforcing structure, the reinforcing structure is provided with a groove and comprises a first retaining wall and a second retaining wall, the first retaining wall and the second retaining wall are two oppositely arranged side walls of the groove, a plurality of light emitting chips are arranged along the length direction of the light bar according to a preset interval, the light emitting chips are arranged at the bottom of the groove, and a first reflecting surface and a second reflecting surface are arranged on the light emitting chips along two opposite sides from the bottom of the groove to the opening direction of the groove;
the fluorescent glue is filled in the groove;
and part of light rays emitted by the light emitting chip enter a target area after being reflected by the first reflecting surface or the second reflecting surface.
Preferably, the first reflective surface and the second reflective surface are both coated with a high reflectivity material.
Preferably, the first retaining wall and the second retaining wall are respectively provided with a light guide channel, a light inlet of each light guide channel is arranged opposite to the side surface, close to the first reflecting surface or the second reflecting surface, of the light emitting chip, and a light outlet of each light guide channel is arranged at the top of the first retaining wall or the second retaining wall and opposite to the target area.
Preferably, a diffusion plate is installed at a light outlet of the light guide channel, and a light outlet of the diffusion plate faces the target area.
Preferably, a reflector is arranged in the light guide channel or a high-reflectivity material is coated on the inner wall of the light guide channel.
Preferably, the width of the bottom of the groove is smaller than the width of the opening of the groove, and the width of the bottom of the groove is changed in increments from the width of the opening of the groove.
Preferably, the first reflecting surface and the second reflecting surface are inclined planes and/or curved surfaces, the distance from the side surface of each light emitting chip to the reflecting surface on the same side of the light emitting chip is a first distance, the first distance is smaller than a threshold distance, the distance between two adjacent light emitting chips of the light bar is a second distance, and the first distance and the second distance are determined according to light emitting parameters of the light emitting chips.
The invention also provides a light bar packaging process, which comprises the following operation steps:
s1: forming a reinforced structure on the substrate by adopting an integrated forming process, wherein the reinforced structure is provided with a groove and comprises a first retaining wall and a second retaining wall, and the first retaining wall and the second retaining wall are two oppositely arranged side walls of the groove;
s2: fixing a plurality of light emitting chips at the bottom of the groove of the reinforcing structure;
s3, coating high-reflectivity material on the side wall of the groove to form a first reflecting surface and a second reflecting surface;
s4: filling the grooves of the reinforcing structure with fluorescent glue;
s5: cutting the substrate and the reinforcing structure at one time according to the packaging size of the light bar to obtain the light bar, wherein the cutting direction is along the length direction of the light bar, and the cutting position is the middle part of the reinforcing structure in the length direction;
s6: electrically connecting a plurality of light-emitting chips of the light bar, and leading out welding pins;
s7: and covering a protective layer on the light bar.
The invention also provides a backlight module which is characterized by comprising the lamp strip as recited in any one of claims 1 to 7, wherein a first light emitting surface of a light emitting chip of the lamp strip is parallel to a light incident surface of a light guide plate of the backlight module, a second light emitting surface of the light emitting chip is perpendicular to the light incident surface of the light guide plate of the backlight module, and the width of the first light emitting surface is smaller than the thickness of the light incident surface of the light guide plate.
The invention also provides display equipment which is characterized by comprising the backlight module.
In conclusion, the beneficial effects of the invention are as follows:
the invention provides a light bar, a light bar packaging process, a backlight module and display equipment, which are used for solving the technical problems of reduced front-view screen brightness and poor light bar quality.
The beneficial effects are that:
according to the invention, the reinforcing structure is additionally arranged between the substrate and the light-emitting chip, so that the stability of the light-emitting chip and the substrate is improved, and the stability of the light bar is realized.
Specifically, be equipped with reinforced structure on the base plate, reinforced structure includes first barricade and second barricade, be equipped with the recess between first barricade and the second barricade, set up luminous chip in the recess bottom along the length direction of lamp strip, then fill the recess with fluorescent glue to fixing luminous chip in the recess, because the recess is reinforced structure's local structure, reinforced structure and base plate have fine whole plasticity, improve the anti ability of buckling of lamp strip itself, realize lamp strip and luminous chip's stability.
Beneficial effects 2:
according to the invention, by adopting the light reflection principle, part of light rays emitted by the light-emitting chip enter the target area after being reflected, and the quantity of the light rays entering the target area is increased, so that the brightness of the target area is improved.
Specifically, a first reflecting surface and a second reflecting surface are arranged on the substrate along two sides of the length direction of the light bar, the light emitting chips are arranged along the length direction of the light bar at preset intervals (namely, the light emitting chips are arranged in the grooves according to the specification and the size of the light emitting chips, the mounting distances are arranged), the light emitting chips are arranged at the bottoms of the grooves, light rays emitted by the light emitting chips and perpendicular to the target area directly enter the target area, the light rays emitted by the light emitting chips and incapable of directly entering the target area are reflected by the first reflecting surface and the second reflecting surface and then enter the target area, the light rays of the point light source are converted into linear light sources, and meanwhile, the light ray mixing distance is reduced, so that the distance between the light emitting chips can be reduced, and the brightness of the target area is improved (namely, the brightness of a screen is.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, without any creative effort, other drawings may be obtained according to the drawings, and these drawings are all within the protection scope of the present invention.
FIG. 1 is a schematic structural diagram of a backlight module in the prior art;
FIG. 2 is a schematic diagram of light emitted from a light bar in the prior art;
FIG. 3 is a diagram of a light-emitting pattern of a backlight module in the prior art;
FIG. 4 is a schematic view of a broken light bar structure in the prior art;
fig. 5 is a side view of the structure of the light bar in embodiment 1 of the invention;
fig. 6 is a side view of a structure of a light bar with light guide channels in embodiment 1 of the invention;
fig. 7 is a structural axial view of the light bar in embodiment 1 of the invention;
fig. 8 is a top half sectional view of the light bar of embodiment 1 of the present invention;
fig. 9 is a schematic view of a position of a reflecting surface of the light bar in embodiment 1 of the invention;
fig. 10 is a schematic view of light emission of the light bar in embodiment 2 of the invention;
FIG. 11 is a diagram of a light-emitting mode of the backlight module according to embodiment 2 of the present invention;
FIG. 12 is a graph showing the effective luminous flux of the backlight module in embodiment 2 of the present invention;
fig. 13 is a block diagram of a packaging process of the light bar in embodiment 3 of the invention;
fig. 14 is a flowchart of a packaging process of the light bar in embodiment 3 of the invention;
fig. 15 is a schematic structural diagram of a backlight module in embodiment 4 of the invention.
Parts and numbering in the drawings:
1. a substrate; 2. a light emitting chip; 3. reinforcing the structure; 31. a first reflective surface; 32. a second reflective surface; 33. a diffusion plate; 34. a light inlet; 35. a light guide channel; 36. a light outlet; 4. fluorescent glue; 5. a fluorescent film; 501. cracking; 6. a fixing plate; 7. a light-reflecting sheet; 8. a light guide plate; 81. a light incident surface; 82. a light-emitting surface; 9. a light transmitting layer; 10. a fixed layer; 12. a blade; 13. welding feet; 14. a first reflective surface; 15. a second reflective surface; 16. light rays.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. In case of conflict, it is intended that the embodiments of the present invention and the individual features of the embodiments may be combined with each other within the scope of the present invention.
Example 1:
as shown in fig. 5, 6, 7 and 8, embodiment 1 of the present invention discloses a light bar, which includes a substrate 1 and a plurality of light emitting chips 2, wherein a length direction of the light bar is an X direction in fig. 8;
the light bar is characterized in that a reinforcing structure 3 is arranged on the substrate 1, the reinforcing structure 3 is provided with a groove and comprises a first retaining wall and a second retaining wall, the first retaining wall and the second retaining wall are two oppositely arranged side walls of the groove, the light emitting chips 2 are arranged along the length direction of the light bar at preset intervals, the light emitting chips 2 are arranged at the bottom of the groove, and a first reflecting surface 31 and a second reflecting surface 32 are arranged on two opposite sides of the light emitting chips 2 along the direction from the bottom of the groove to the opening of the groove;
the fluorescent glue 4 is filled in the groove;
part of the light emitted by the light emitting chip 2 enters a target area after being reflected by the first reflecting surface 31 or the second reflecting surface 32.
Specifically, reinforced structure 3 integrated into one piece on base plate 1 avoids in installation and later stage use, and reinforced structure 3 and the separation of base plate 1 lead to emitting chip 2 and the separation of base plate 1, appear opening circuit. As shown in fig. 5, the fluorescent glue 4 is filled in the groove of the reinforcing structure 3, and the contact area between the fluorescent glue 4 and the reinforcing structure 3 is: s is 1+ S2+ S3 ═ S1, S1 is the area of contact of fluorescent glue 4 and recess bottom, S2 is the area of contact of fluorescent glue 4 and the side of first barricade, the area of contact of the side of S3 fluorescent glue 4 and second barricade, area of contact increases, fluorescent glue 4 fixes emitting chip 2 in reinforced structure 3' S recess, reinforced structure 3 has fine whole plasticity for the plane of prior art for spatial structure, thereby improve the anti bending capability of lamp strip itself, thereby the stability of lamp strip and emitting chip 2 has been improved.
Meanwhile, a part of light emitted by the light emitting chip 2 can directly enter a target area, and the other part of light emitted by the light emitting chip 2 passes through the fluorescent film 5 to enter the target area after being reflected by the first reflecting surface 31 and/or the second reflecting surface 32, so that the light emitted by the point light source is converted into the light emitted by the same line light source, and the requirement of narrow-edge design on the line light source is met. As shown in fig. 8 and fig. 5 and 6, the plurality of light emitting chips 2 are mounted on the bottom plate of the reinforcing structure 3 at predetermined intervals, and a part of light emitted from the light emitting surface of the light emitting chip 2 along the length direction of the retaining wall enters the target area through the first reflecting surface 31 and the second reflecting surface 32, so that the light mixing distance can be reduced (for example, part of light which is mixed by the adjacent light emitting chips 2 near the first retaining wall or the second retaining wall due to the presence of the retaining wall is not mixed), thereby reducing the distance between the light emitting chips 2 and the bottom of the groove, and allowing the target area to receive more light, so that light with a larger emission angle is utilized, thereby improving the utilization rate of light emitted by the light emitting chips. The first reflecting surface 31 and the second reflecting surface 32 are made of a highly reflective resin material, preferably a white diffuse reflective PC material.
As shown in fig. 5 and 6, the first reflecting surface 31 may be disposed on a side surface of the first retaining wall, or may exist independently; the second reflecting surface 32 may be disposed on a side surface of the second retaining wall, or may exist independently; the light emitting chip 2 generates white light through the fluorescent glue 4, and the fluorescent glue 4 can also be realized by adopting a structure with the same effect, for example: white light can also be obtained by filling the grooves of the reinforcing structure with an adhesive and then disposing a fluorescent film at the groove opening, and therefore, this is not particularly limited.
In one embodiment:
preferably, the first reflecting surface 31 and the second reflecting surface 32 are both coated with a high-reflectivity material.
Preferably, the first retaining wall and the second retaining wall are respectively provided with a light guide channel 35, a light inlet 34 of each light guide channel 35 is arranged opposite to the side surface of the light emitting chip 2 close to the first reflecting surface 31 or the second reflecting surface 32, and a light outlet 36 of the light guide channel 35 is located at the top of the first retaining wall or the second retaining wall and is arranged opposite to the target area.
Specifically, as shown in fig. 6 and 7, the line light source emitted by the light emitting chip 2 enters the target area after being reflected by the first reflecting surface 31 and the second reflecting surface 32, but the first retaining wall and the second retaining wall of the reinforcing structure 3 have thicknesses at the opening positions, so that no light enters the target area on the plane where the top surfaces of the first retaining wall and the second retaining wall are located, a black area is formed at the corresponding position of the target area, the light of the light emitting dead angle formed between the second light emitting surface (the side surface of the light emitting chip along the length direction of the light bar) of the LED light emitting chip 2 and the corresponding first reflecting surface 31 or second reflecting surface 32 enters through the light inlet 34 of the light guiding channel 35 by arranging the light guiding channel 35, and then enters the target area (the light guiding plate 8) from the light outlet 36, the non-emitting area (black area) formed at the top of the first retaining wall and the second retaining wall is eliminated, the light emitting angle is enlarged, the luminous efficiency is further improved, and the light emission is more uniform.
In yet another embodiment:
preferably, a diffusion plate 33 is installed at a light outlet of the light guide channel, and a light outlet surface of the diffusion plate 33 faces the target area.
Specifically, light at a light-emitting dead angle formed between the LED light-emitting chip 2 and the first reflecting surface 31 or the second reflecting surface 32 enters the diffusion plate 33 through the light outlet 36, and after diffusion of the diffusion plate 33, the light-emitting angle is increased, a black area can be eliminated, light entering a target area is more, the angle is wider, the luminous flux utilization efficiency of the light-emitting chip 2 is improved, and light emission is more uniform.
In another embodiment:
as shown in fig. 6 and 7, the top of each of the first retaining wall and the second retaining wall is provided with diffuser plate mounting grooves at predetermined intervals, the number of the diffuser plate mounting grooves is equal to the number of the light emitting chips 2, and the interval between the diffuser plate 33 and the diffuser plate 33 may or may not be set as required, which is not specifically limited herein.
In another embodiment:
preferably, a reflector is arranged in the light guide channel or the inner wall of the light guide channel 35 is coated with a high-reflectivity material.
Preferably, the width of the bottom of the groove is smaller than the width of the opening of the groove, and the width of the bottom of the groove is changed in increments from the width of the opening of the groove.
Preferably, the first reflecting surface 31 and the second reflecting surface 32 are inclined planes and/or curved surfaces, a distance from a side surface of the light emitting chip to the reflecting surface on the same side is a first distance, the first distance is smaller than a threshold distance, a distance between two adjacent light emitting chips of the light bar is a second distance, and the first distance and the second distance are determined according to light emitting parameters of the light emitting chips.
Specifically, as shown in fig. 9, a distance from a side surface of the light emitting chip 2 to a reflection surface on the same side surface is a first distance, the first distance is smaller than a threshold distance, and a distance between two adjacent light emitting chips 2 of the light bar is a second distance; the distance between the two light emitting chips 2 is b, the distance from the upper side surface of the light emitting chip 2 to the first reflecting surface 14 is a, the distance from the lower side surface of the light emitting chip 2 to the second reflecting surface 14 is a, and the distance from the intersection point of the light rays 16 emitted by the two light emitting chips 2 to the corresponding side surface of the light emitting chip 2 is c; the distance c is the threshold distance, and the distance a is smaller than the distance c, so that the light rays emitted by the adjacent light-emitting chips 2 can be prevented from crossing, the light mixing distance is shortened, the distance b can be shortened, and the distance between the light-emitting chips is reduced.
Example 2:
the light bar of the embodiment 2 of the invention is improved on the basis of the embodiment 1,
as shown in table 1, the differences in the lighting effects of the conventional LED light bar, the LED light bar packaged in the prior art, and the LED light bar packaged in the present invention can be obtained, specifically:
TABLE 1
Therefore, in the narrow-edge design of the LED lamp strip, the utilization rate of light rays emitted by the light emitting chips 2 is very close to that of the traditional LED lamp strip, and the lighting effect can completely meet the normal use requirement.
As shown in fig. 10 and 11, part of the light emitting chip 2 enters the light guide channel 35 through the light inlet 34, enters the diffusion plate 33 through the light outlet 36 after being diffused, and enters the light guide plate 8 after being diffused by the diffusion plate 33 to eliminate a black area generated by a retaining wall, so that the light surface is enlarged, and the uniform distribution of light intensity is improved; the light emitted from the light emitting surface of the light emitting chip 2 parallel to the light incident surface 81 of the light guide plate 8 directly enters the light guide plate, and the light with a large divergence angle (equivalent to vertical direction) >60 ° is reflected by the first reflecting surface 31 and the second reflecting surface 32, so that the original large divergence angle is reduced (namely, the direction of the light in the area of the original large divergence angle is changed by the upper reflecting plate 3 and the lower reflecting plate, so that the light which is absorbed by the fixing plate 6 and lost can enter the light guide plate 8 through the light incident surface 81 of the light guide plate 8), the light guide plate 8 receives more light, and the light emergent surface 82 of the light guide plate 8 can emit more light, thereby reducing the brightness loss and improving the screen brightness. As shown in fig. 11, compared with the conventional scheme, the light bar scheme of the present invention has only about 5% of brightness loss, and compared with the prior art, the screen brightness can be improved by about 30%; therefore, obvious brightness attenuation cannot occur on the final screen brightness, so that the use requirement of a user is met, and the increase of the backlight power consumption is avoided.
In another embodiment, when the specifications of the light emitting chips 2 are the same, the inclination angles of the first reflective surface 31 and the second reflective surface 32 affect the quantity of light rays finally entering the light guide plate 8, and the propagation angle of the light emitting chips 2 can be adjusted by adjusting the angles of the inclined surfaces of the first reflective surface 31 and the second reflective surface 32, so that more light rays directly or after reflection enter the light incident surface 81 of the light guide plate 8.
As shown in fig. 12 a and 12 b, the inclination angles of the first and second reflection surfaces 31 and 32 with respect to the substrate 1 direction are assumed as the inclination base angles (i.e., θ in the drawing), and as shown in fig. 12 c, the first and second reflection surfaces 31 and 32 are assumed as the bezz curve-shaped cross sections, and simulation tests are performed on different inclination base angles by simulation software, and the simulation results are:
as shown in table 2 in conjunction with fig. 12, when the bottom angles are inclined differently, the utilization rates of the light emitted from the light bars are different, specifically:
TABLE 2
Therefore, the lighting effect of the lamp strip can reach 95% of that of the traditional lamp strip, the brightness loss is only about 5%, the lighting effect cannot be influenced, and the brightness loss is only about 3.5% of that of the traditional lamp strip by setting the inclined angle or using the proper curved surface according to the signal of the light emitting chip 2.
By adopting the lamp strip of the embodiment, the display brightness of the final screen is only about 5% of brightness loss compared with the traditional scheme, and the screen brightness can be improved by about 30% compared with the screen brightness in the prior art; therefore, obvious brightness attenuation cannot occur on the final screen brightness, so that the use requirement of a user is met, and the increase of the backlight power consumption is avoided.
The rest of the structure and the operation principle of the embodiment 2 are the same as those of the embodiment 1.
Example 3:
the embodiment 3 of the invention discloses a light bar packaging process, which comprises the following operation steps as shown in fig. 13 and 14:
s1: forming a reinforced structure on the substrate by adopting an integrated forming process, wherein the reinforced structure is provided with a groove and comprises a first retaining wall and a second retaining wall, and the first retaining wall and the second retaining wall are two oppositely arranged side walls of the groove;
specifically, a plurality of reinforcing structures 3 are injection-molded on one side of a substrate 1 through an integral molding process, a groove is formed in each reinforcing structure 3, and better overall plasticity can be obtained through structural stress, so that the bending resistance of the light bar is improved, the breakage of the light bar and poor welding of a chip are avoided, and the production yield is improved;
meanwhile, the inner side surfaces of the grooves are used as the first reflecting surface 31 and the second reflecting surface 32, the structural symmetry can be guaranteed through integral forming, and the utilization efficiency of light emission can be improved.
Further, for the first retaining wall and the second retaining wall provided with the light guide channel, the following steps are required during manufacturing: confirm earlier the income light-admitting opening position and the light-emitting opening position of light-conducting channel, then the trompil, be close to the light-emitting opening position at light-conducting channel and set up the structure of installation diffuser plate, if set up recess (diffuser plate mounting groove), the installation looks adaptation of recess size and diffuser plate, then coating high reflectivity reflecting material layer or installation speculum behind the trompil on the inner wall to the light that will get into behind the light-conducting channel is introduced the light-emitting opening. And installing the diffusion plate to the groove, wherein the first retaining wall and the second retaining wall form the diffusion plate.
S2: fixing a plurality of light emitting chips 2 at the bottom of the groove of the reinforcing structure 3;
the light emitting chips 2 are arranged at the bottom of the groove of the reinforcing structure 3 along the length direction of the light bar according to a preset spacing distance, the light emitting chips 2 are specifically installed on the bottom of the groove of the reinforcing structure 3 through an SMT (Surface Mount Technology), and partial light emitted by the light emitting chips 2 along the light emitting Surface of the retaining wall in the length direction enters a target area through a first reflecting Surface and a second reflecting Surface, so that the light mixing distance can be reduced, and the distance between the light emitting chips 2 arranged at the bottom of the groove can be reduced.
S3, coating high-reflectivity material on the side wall of the groove to form a first reflecting surface and a second reflecting surface;
s4: filling the grooves of the reinforcing structure 3 with fluorescent glue 4;
specifically, the grooves of the reinforcing structure 3 are filled with the fluorescent glue 4, and the fluorescent glue 4 is fixed in the grooves of the reinforcing structure 3 through a baking process, so that the stability of the light-emitting chip 2 and the substrate 1 is improved; the fluorescent glue 4 can also be realized by adopting a structure with the same effect, such as: white light can also be obtained by filling the grooves of the reinforcing structure with an adhesive and then disposing a fluorescent film at the groove opening, and therefore, this is not particularly limited.
S5: the substrate and the reinforcing structure are cut at one time according to the packaging size of the light bar to obtain the light bar, the cutting direction is along the length direction of the light bar, and the cutting position is in the middle of the length direction of the reinforcing structure.
S6: electrically connecting a plurality of light emitting chips 2 of the light bar, and leading out welding pins 13;
a plurality of light emitting chips 2 are electrically connected to the substrate 1 according to the number of the light emitting chips 2 (the light emitting chips are connected in series and/or in parallel and then lead out a bonding pad), and then a fillet 13 is led out.
S7: and covering a protective layer on the light bar.
In order to prevent the fluorescent glue 4 from deteriorating in high temperature and high humidity or other severe environments, the whole periphery of the light bar is covered with a protective layer, and the protective layer is preferably made of epoxy or silica gel materials.
Adopt the lamp strip of this embodiment, lamp strip stable in structure, and the screen brightness loss of display screen is little, and luminance is high.
The rest of the structure and the operation principle of the embodiment 3 are the same as those of the embodiment 1.
Example 4:
as shown in fig. 15, the backlight module includes the light bars of embodiments 1 to 3, and a fixing plate 6, a reflective sheet 7 and a light guide plate 8;
The width of the light emitting chip 2 should be smaller than the thickness of the light incident surface 81 of the corresponding light guide plate 8, so as to reserve a reflection distance for the reflection surfaces of the first reflection surface 31 and the second reflection surface 32, prevent the light from re-entering the chip after being reflected by the reflection surfaces of the first reflection surface 31 and the second reflection surface 32 to cause an absorbed phenomenon, reduce the loss of the light, and enable more light to enter the light guide plate 8; the depths of the first and second reflection surfaces 31 and 32 are greater than the thickness of the light emitting chip 2.
Adopt the backlight unit of embodiment 4, through setting up first plane of reflection 31 and second plane of reflection 32, the mode restriction that passes through the reflection with the big visual angle light of emitting chip 2 is littleer visual angle light, reduces light and is absorbed for light-passing board 8 can receive more light, thereby improves the luminance of display screen.
Simultaneously, fluorescent glue 4 will give out light chip 2 and fix in integrated into one piece's reinforced structure 3's recess, and integrated into one piece's reinforced structure 3 is spatial structure, and this structure has fine whole plasticity for prior art's plane to improve the anti ability of buckling of lamp strip itself, thereby improved lamp strip and luminous chip 2's stability.
Example 5:
After the display device in embodiment 5 adopted above-mentioned structure, fluorescent glue 4 will give out light chip 2 and fix in integrated into one piece's reinforced structure 3's recess, integrated into one piece's reinforced structure 3 is spatial structure, this structure has fine whole plasticity for the plane of prior art, thereby improve the anti bending capability of lamp strip itself, thereby lamp strip and luminous chip 2's stability has been improved, prevent in equipment and later stage use, base plate 1 and fluorescent film 5 appear separating because of extrusion and stress and lead to luminous chip 2 to open circuit, phenomenons such as dead lamp appear.
After the display device in embodiment 5 adopts the above structure, the incident light emitted by the light emitting chip 2 enters the light incident surface 81 of the light guide plate 8 after being reflected by the first reflecting surface and the second reflecting surface, and the light guide plate 8 can receive more light, so that the display screen can receive more light from the light emergent surface 82 of the light guide plate 8, thereby improving the brightness of the display screen, and compared with the conventional LED, the brightness is only lost by about 5%, and is improved by about 30% compared with the prior art.
The display device of embodiment 5 includes: LED display screen, LCD display screen, traditional light-passing board and light-transmitting film, such as computer, mobile phone, instrument, television, panel lamp, and other electronic equipment and electrical appliances.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A light bar is characterized by comprising a substrate and a plurality of light emitting chips;
the light bar is provided with a base plate, the base plate is provided with a reinforcing structure, the reinforcing structure is provided with a groove and comprises a first retaining wall and a second retaining wall, the first retaining wall and the second retaining wall are two oppositely arranged side walls of the groove, a plurality of light emitting chips are arranged along the length direction of the light bar according to a preset interval, the light emitting chips are arranged at the bottom of the groove, and a first reflecting surface and a second reflecting surface are arranged on the light emitting chips along two opposite sides from the bottom of the groove to the opening direction of the groove;
the fluorescent glue is filled in the groove;
and part of light rays emitted by the light emitting chip enter a target area after being reflected by the first reflecting surface or the second reflecting surface.
2. The light bar of claim 1, wherein the first reflective surface and the second reflective surface are both coated with a high reflectivity material.
3. The light bar according to claim 2, wherein the first retaining wall and the second retaining wall are respectively provided with a light guide channel, a light inlet of each light guide channel is arranged opposite to the side surface of the light emitting chip close to the first reflecting surface or the second reflecting surface, and a light outlet of each light guide channel is arranged at the top of the first retaining wall or the second retaining wall and opposite to the target area.
4. The light bar of claim 3, wherein a diffuser plate is installed at a light outlet of the light guide channel, and a light outlet of the diffuser plate faces the target area.
5. The light bar of claim 4, wherein a reflector is disposed in the light guide channel or a high reflectivity material is coated on an inner wall of the light guide channel.
6. The light bar of any one of claims 1 to 5, wherein the width of the bottom of the groove is less than the width of the opening of the groove, and the width of the bottom of the groove varies incrementally to the width of the opening of the groove.
7. The light bar of any one of claims 1 to 5, wherein the first reflective surface and the second reflective surface are inclined planes and/or curved surfaces, a distance from a side surface of the light emitting chip to the reflective surface on the same side of the light emitting chip is a first distance, the first distance is smaller than a threshold distance, a distance between two adjacent light emitting chips of the light bar is a second distance, and the first distance and the second distance are determined according to light emitting parameters of the light emitting chips.
8. A light bar packaging process is characterized by comprising the following operation steps:
s1: forming a reinforced structure on the substrate by adopting an integrated forming process, wherein the reinforced structure is provided with a groove and comprises a first retaining wall and a second retaining wall, and the first retaining wall and the second retaining wall are two oppositely arranged side walls of the groove;
s2: fixing a plurality of light emitting chips at the bottom of the groove of the reinforcing structure;
s3, coating high-reflectivity material on the side wall of the groove to form a first reflecting surface and a second reflecting surface;
s4: filling the grooves of the reinforcing structure with fluorescent glue;
s5: cutting the substrate and the reinforcing structure at one time according to the packaging size of the light bar to obtain the light bar, wherein the cutting direction is along the length direction of the light bar, and the cutting position is the middle part of the reinforcing structure in the length direction;
s6: electrically connecting a plurality of light-emitting chips of the light bar, and leading out welding pins;
s7: and covering a protective layer on the light bar.
9. A backlight module, comprising the light bar of any one of claims 1 to 7, wherein a first light emitting surface of a light emitting chip of the light bar is parallel to a light incident surface of a light guide plate of the backlight module, a second light emitting surface of the light emitting chip is perpendicular to the light incident surface of the light guide plate of the backlight module, and a width of the first light emitting surface is smaller than a thickness of the light incident surface of the light guide plate.
10. A display device comprising the backlight module according to claim 9.
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| CN204554561U (en) * | 2015-05-06 | 2015-08-12 | 新科实业有限公司 | LED backlight light source |
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| CN208093588U (en) * | 2018-02-09 | 2018-11-13 | 中山市立体光电科技有限公司 | A kind of LED light bar |
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| CN211554582U (en) * | 2020-04-08 | 2020-09-22 | 深圳吉宜科技有限公司 | Light bar, backlight module and display device |
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| CN204554561U (en) * | 2015-05-06 | 2015-08-12 | 新科实业有限公司 | LED backlight light source |
| CN205782312U (en) * | 2016-05-23 | 2016-12-07 | 深圳创维－Rgb电子有限公司 | A kind of backlight module and display device |
| CN208093588U (en) * | 2018-02-09 | 2018-11-13 | 中山市立体光电科技有限公司 | A kind of LED light bar |
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