CN109754711B - Backlight module, preparation method thereof and display device - Google Patents
Backlight module, preparation method thereof and display device Download PDFInfo
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- CN109754711B CN109754711B CN201910175979.9A CN201910175979A CN109754711B CN 109754711 B CN109754711 B CN 109754711B CN 201910175979 A CN201910175979 A CN 201910175979A CN 109754711 B CN109754711 B CN 109754711B
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Abstract
The invention discloses a backlight module, a preparation method thereof and a display device. The backlight module comprises a back plate, a plurality of LEDs arranged on the back plate at intervals and a light gathering body arranged between the adjacent LEDs, wherein the light gathering body can enable at least part of light rays emitted by the LEDs around the light gathering body to be gathered after being emitted from the surface of the light gathering body and emitted from the light gathering body. This backlight unit has set up a pointolite between adjacent LED in other words to, no longer need increase between adjacent LED and set up LED, can use under the prerequisite of less LED number and cost, promote the regional luminance between the adjacent LED, promote the holistic light-emitting homogeneity of backlight unit, improve LED's utilization ratio, be favorable to realizing adopting LED backlight unit in notebook computer and TV set field.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a preparation method of the backlight module and a display device.
Background
With the development of the display industry, Mini light emitting diodes (Mini LEDs) are rapidly rising. The Mini LED is a transition LED between a conventional (Normal) LED and a Micro (Micro) LED, and has the characteristics of high efficiency, high reliability, high brightness, and fast response time, and is technically less difficult than the Micro LED, and is easily produced in mass. In the prior art, the Mini LED is mainly applied to the mobile phone industry and hardly applied to the fields of notebook computers and televisions. The reason is that the screen sizes of the notebook computer and the television are large, so that the backlight module of the notebook computer and the television needs to use a large number of Mini LEDs to meet the requirement of the display device on light emitting uniformity. Generally, 9000-10000 Mini LEDs are needed for panel backlight of a 5-inch smart phone, and the number of the Mini LEDs needed for panel backlight of a television can reach hundreds of thousands of the Mini LEDs, so that the cost of the backlight module is increased, and the reliability of the backlight module is reduced due to too many Mini LEDs.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a backlight module, a method for manufacturing the same, and a display device, so as to improve light-emitting uniformity of the backlight module under the condition of using fewer LEDs.
In order to solve the above technical problem, an embodiment of the present invention provides a backlight module, which includes a back plate, a plurality of LEDs disposed on the back plate at intervals, and a light collector disposed between adjacent LEDs, where the light collector enables at least some light rays emitted by the LEDs disposed around the light collector to enter from a surface of the light collector, to be collected, and to be emitted from the light collector.
Optionally, backlight unit is still including setting up LED's the diffusion layer that deviates from backplate one side, the spotlight body is for from the orientation of diffusion layer towards on the one side of LED towards the convex arch of backplate direction, at least some light that LED sent is from the side of spotlight body jets into in the spotlight body, and pass through in proper order the spotlight body with jet out behind the diffusion layer, another some light that LED sent passes through jet out behind the diffusion layer.
Optionally, the light collector is an inverted cone or an inverted cone table.
Optionally, the cone angle of the light collector is 60 ° to 90 °.
Optionally, a plurality of the LEDs are arranged in an array, and the LEDs in two adjacent rows or two adjacent columns are staggered.
Optionally, the row spacing between two adjacent rows of LEDs is equal to the column spacing between two adjacent columns of LEDs, and the orthographic projection edge of the light collector on the back plate is connected to the orthographic projection edge of the surrounding LEDs on the back plate.
Optionally, the back plate comprises a substrate and a reflective layer disposed on a side of the substrate facing the diffusion layer.
Optionally, the backlight module further comprises a protection adhesive layer covering the LED, a groove corresponding to the light collector is formed in the protection adhesive layer, the diffusion layer is attached to the protection adhesive layer, and the light collector is embedded into the groove.
Optionally, the refractive index of the protective adhesive layer is smaller than the refractive index of the light collector.
Optionally, the light emitting angle of the LED is 120 °, and the bottom end of the light collector is lower than the top end of the LED.
In order to solve the above technical problem, an embodiment of the present invention further provides a method for manufacturing a backlight module, including:
disposing the LEDs on the back plate;
forming a protective adhesive layer on the back plate on which the LED is formed by adopting a coating method;
processing the protective adhesive layer to semi-cure the protective adhesive layer;
forming a groove between adjacent LEDs on the upper surface of the protective adhesive layer;
and coating the protective adhesive layer to form a light gathering body and a diffusion layer, wherein the light gathering body is embedded into the groove.
In order to solve the above technical problem, an embodiment of the present invention further provides a display device, including the backlight module described above.
According to the backlight module provided by the embodiment of the invention, the light gathering body is arranged between the adjacent LEDs, and the light gathering body can enable the light emitted by the adjacent LEDs to be gathered after being emitted from the side surface of the light gathering body and emitted from the light emitting surface of the light gathering body, so that the light gathering body is equivalent to a point light source arranged between the adjacent LEDs, and therefore, the actual LEDs do not need to be added between the adjacent LEDs, the light emitting brightness of the area between the adjacent LEDs can be improved on the premise of using less LED particles and cost, the light emitting uniformity of the whole backlight module is improved, the utilization rate of the LEDs is improved, and the LED backlight module is beneficial to being adopted in the fields of notebook computers and televisions.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a schematic cross-sectional view of a backlight module according to a first embodiment of the present invention;
FIG. 2 is a schematic light path diagram of the backlight module shown in FIG. 1;
FIG. 3 is a schematic top view of the backlight module shown in FIG. 1;
FIG. 4 is a detailed optical path diagram of the backlight module shown in FIG. 1;
FIG. 5 is a schematic diagram of the optical path of the light concentrator at a cone angle of 60 °;
FIG. 6 is a schematic diagram of the optical path when the cone angle of the light collector is 90 °;
FIG. 7 is a schematic diagram of a structure after LEDs are formed in the process of forming a backlight module;
FIG. 8 is a schematic structural diagram of a backlight module after forming a groove in the process of forming the backlight module.
Description of reference numerals:
1-a back plate; 11-a substrate; 12-a reflective layer;
2-an LED; 3-a diffusion layer; 31-a light collector;
32 — a first region; 5-protective glue layer; 51-groove.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The technical contents of the present invention will be described in detail by specific embodiments.
The first embodiment:
fig. 1 is a schematic cross-sectional view of a backlight module according to a first embodiment of the invention. The backlight module comprises a back plate 1 and a plurality of LEDs 2, wherein the plurality of LEDs 2 are arranged on the back plate 1 at intervals. The backlight assembly further includes a light concentrator 31 disposed between adjacent LEDs 2. The light collector 31 may collect and emit at least some light rays emitted from LEDs (LEDs adjacent to the light collector 31) located around the light collector 31 from the light emitting surface 311 of the light collector 31 after entering from the surface of the light collector 31. In fig. 1, the light-emitting direction of the backlight module is vertical upward, and the light-emitting surface 311 may be perpendicular to the light-emitting direction of the backlight module in order to ensure that the light emitted from the light-gathering body 31 faces the light-emitting direction. It is easily understood that the light concentrator 31 is disposed between the adjacent LEDs 2, that is, the orthographic projection of the light concentrator 31 on the back sheet 1 is between the orthographic projections of the adjacent LEDs 2 on the back sheet 1, as shown in fig. 1, as long as the light concentrator 31 is vertically positioned between the adjacent LEDs 2, and the relative height of the light concentrator 31 and the LEDs 2 is not limited.
It is easy to understand that, when a Mini LED backlight module is adopted for a large-sized display device, in order to obtain light-emitting uniformity, the Mini LEDs need to be fully distributed on the backlight module, and thus, the backlight module needs to use a large number of Mini LEDs.
In the embodiment of the invention, the light-gathering body 31 is arranged between the adjacent LEDs 2, and the light-gathering body 31 can enable the light emitted by the LEDs around the light-gathering body 31 (the light emitted by the LED2 adjacent to the light-gathering body 31) to be emitted from the side surface of the light-gathering body 31, and then to be converged and emitted from the light-emitting surface 311 of the light-gathering body 31, which is equivalent to arranging a point light source between the adjacent LEDs 2 at the position of the light-gathering body 31, so that the actual LEDs do not need to be added between the adjacent LEDs 2, the light-emitting brightness of the area between the adjacent LEDs can be improved on the premise of using less LED numbers and cost, the light-emitting uniformity of the whole backlight module is improved, and the utilization rate of the LEDs 2 is improved. The Mini LED backlight module is favorable for being adopted in the field of notebook computers and televisions.
As shown in fig. 1, the backlight module according to the embodiment of the invention may further include a diffusion layer 3, the diffusion layer 3 is disposed on a side of the LED2 facing away from the back plate 1, and the light collector 31 is located between the diffusion layer 3 and the back plate 1.
It is easy to understand that there is a certain distance between adjacent LEDs, and the light emitting angle of the LED package is usually about 120 ° (it is easy to understand that the light emitted from the LEDs is combined to form a cone, and the light emitting angle of the LEDs is the cone angle of the cone), so that a light mixing region occurs between two adjacent LEDs. In the light mixing region, the brightness of the region with much overlapped light is high, the brightness of the region with little overlapped light is weak, and light and shade alternate lamp shadows (Hotspot) exist on the side close to the LED. According to the backlight module provided by the embodiment of the invention, the light gathering body 31 is arranged between the adjacent LEDs 2, and the diffusion layer 3 is arranged on the light emergent sides of the light gathering body 31 and the LED2, so that part of light rays emitted by the light gathering body 31 and the LED2 can be emitted from the upper surface of the diffusion layer 3 after passing through the diffusion layer 3, and the diffusion layer 3 can diffuse the light rays emitted into the diffusion layer 3, so that a point light source formed by the LED2 and the light gathering body 31 can be converted into a surface light source by the diffusion layer 3, the light mixing area between the adjacent LEDs is improved, the Hotspot failure is improved, and the uniformity of a display device picture is further improved.
In the present embodiment, in order to facilitate the light to propagate between the light collector 31 and the diffusion layer 3, in the present embodiment, as shown in fig. 1, the light collector 31 is a protrusion protruding from the lower surface of the diffusion layer 3, i.e., the surface facing the LED2, in the direction toward the back sheet 1. At least part of the light emitted from the LED enters the light collector 31 from the side of the light collector 31, and is emitted after passing through the light collector and the diffusion layer in sequence, and the other part of the light emitted from the LED is emitted after passing through the diffusion layer.
Set up the spotlight body 31 as the protruding arch of the lower surface from the diffusion layer 3, be favorable to light to incide the diffusion layer 3 by the spotlight body 31, avoid the interference of other media to light between spotlight body 31 and the diffusion layer 3.
It is understood that in other embodiments, the light collector 31 may be a separate component, as long as the light emitted from the surrounding LEDs can be collected after entering from the surface of the light collector and then emitted from the light emitting surface of the diffusion layer, i.e. the upper surface.
Fig. 2 is a schematic light path diagram of the backlight module shown in fig. 1. In the present embodiment, the LED2 is a Mini LED, and the light emission angle of the LED2 is β. As shown in fig. 2, the LED light emitting surface is simplified to a point light source. The light path of the light emitted from the angle range β can be divided into two parts, one part enters the light collector 31 from the side surface of the light collector 31 and is reflected and refracted in the light collector 31 and then is emitted from the first area 32 on the upper surface of the diffusion layer 3, the first area 31 is an area on the upper surface of the diffusion layer 3 corresponding to the light collector 31, and the first area 31 also corresponds to an area between adjacent LEDs; a part of the light passes through the diffusion layer 3 and is emitted from a region corresponding to the LED on the upper surface of the diffusion layer 3. As shown in fig. 2, the left and right sides of the condenser 31 are the first and second LEDs 21 and 22, respectively. A part of the light emitted from the first LED21 passes through the diffusion layer 3 and then is emitted from the region corresponding to the first LED21 on the upper surface of the diffusion layer 3, and a part of the light enters the condenser 31 from the left side surface of the condenser 31; similarly, a part of the light emitted from the second LED22 passes through the diffusion layer 3 and then exits from the region corresponding to the second LED22 on the upper surface of the diffusion layer 3, and a part of the light enters the condenser 31 from the right side surface of the condenser 31. The first LED21 and the second LED22 converge light entering the condenser 31 from the side surface of the condenser 31 in the condenser 31 and emit the light from the first region 32 on the upper surface of the diffusion layer 3.
In order to make the light incident from the side surface of the light collector 31 converge, the light collector 31 may be an inverted cone or an inverted frustum, that is, the cone angle of the light collector faces the back plate 1, as shown in fig. 1, so that the light incident from the side surface of the light collector 31 may converge in the light collector 31. As shown in fig. 1, one end of the light concentrator 31 facing the back plate 1 extends into the space between the adjacent LEDs 2, that is, the bottom end of the light concentrator 31 is lower than the top end of the LED2, so that the light emitted from the LED2 into the light concentrator 31 can be increased, and the light emitting brightness of the first region 32 can be further improved.
In the present embodiment, the light collector 31 is an inverted cone. With the adoption of the light collector 31 with the structure, light rays within the range of 360 degrees around the light collector 31 can be emitted into the light collector 31, so that the light emitting brightness of the first area 32 is further improved, namely the brightness of the area between the adjacent LEDs is further improved. In other embodiments, the light collector 31 may also be an inverted truncated cone.
In order to prevent the light generated by the LED2 from being emitted or consumed from the back sheet 1, in the present embodiment, as shown in fig. 1, the back sheet 1 may include a substrate 11 and a reflective layer 12, and the reflective layer 12 is disposed on a side of the substrate 11 facing the diffusion layer 3. Thus, the reflecting layer 12 can reflect the light irradiated thereon back to the diffusion layer 3 or the condenser 31, further improving the light utilization efficiency.
In order to prevent dust from contaminating the LEDs and affecting the light-emitting effect of the backlight module in long-term use of the backlight module, as shown in fig. 1, the backlight module may further include a protective adhesive layer 5 covering the LEDs 2 and the back plate 1. The protective adhesive layer 5 is provided with a groove 51 corresponding to the light collector 31. The diffusion layer 3 is attached to the protective adhesive layer 5, and the light gathering body 31 is embedded into the corresponding groove 51.
In this embodiment, the material of the protective adhesive layer 5 may include a heat conductive material, such as a heat conductive silicone. The heat-conducting silica gel has high heat conductivity, excellent heat conductivity, good electrical insulation, wider use temperature and good stability, can be continuously used within the range of-60-280 ℃, and has good performance. Such protection glue film 5 not only can prevent that LED from being contaminated in order to guarantee backlight unit's light-emitting effect, and protection glue film 5 can go out LED's heat conduction moreover, for backlight unit heat dissipation, avoids backlight unit high temperature.
In addition, the LEDs are generally disposed on the circuit control board, and thus, the back plate 1 may be the circuit control board. At this time, when the material of the protective adhesive layer 5 includes the heat conductive silica gel, the protective adhesive layer 5 has good electrical insulation, thereby well protecting the LED and the circuit control board.
Fig. 3 is a schematic top view of the backlight module shown in fig. 1. As shown in fig. 3, the plurality of LEDs 2 are arranged in an array, and the LEDs in two adjacent rows or two adjacent columns are staggered. In this embodiment, the spacing between adjacent LEDs on each row is equal, and the spacing between adjacent LEDs on each column is equal. The arrangement is such that the light-condensing body 31 is positioned between two adjacent LEDs in the row direction and between two adjacent LEDs in the column direction at the same time, and then, the periphery of the light-condensing body 31 includes at least 4 LEDs. Therefore, the light-gathering body 31 can gather the light rays emitted by the 4 LEDs and emit the light rays from the first area 32, and the light-emitting brightness of the first area 31 is further improved. Further, with this configuration, the number of the light collectors 31 can be reduced.
In this embodiment, the row and column pitches of the LED arrangement are equal. The orthographic projection edge of the light collector 31 on the back plate 1 is in contact with the orthographic projection edge of the surrounding LEDs (LEDs adjacent to the light collector 31) on the back plate 1. Therefore, as shown in fig. 3, when viewed from the top of the backlight module, the LEDs 2 are distributed on the back plate 1, so as to further improve the uniformity of the light exiting from the light exiting surface of the backlight module.
Fig. 4 is a detailed light path diagram of the backlight module shown in fig. 1. In this embodiment, the light collector 31 and the diffusion layer 3 are made of the same material to ensure that light propagates between the light collector and the diffusion layer. The refractive index of the light collector 31 and the diffusion layer 3 is n2. The refractive index of the protective adhesive layer 5 is n1. In this embodiment, as shown in FIG. 4, the light rays 100 emitted by the first LED21 are at an incident angle θ1Enters the condenser 31 from the left side surface of the condenser 31, and is refracted in the condenser 31 (the refraction angle is θ)2) And is emitted from the upper surface of the diffusion layer 3. At this time, the law of refraction n is satisfied1sinθ1＝n2sinθ2. In order to ensure that the refracted light rays exit from the first region 32 and ensure the light converging action of the light-converging body 31, n in this embodiment2>n1. That is, the protective adhesive layer 5 is an optically thinner medium, and the light collector 31 and the diffusion layer 3 are optically denser media, so that the refraction angle θ2<θ1Therefore, it is ensured that the light entering the light collector 31 from the left side surface of the light collector 31 is refracted in the light collector 31 and then exits from the first region 32.
In the present embodiment, n2>n1Namely, the protective glue layer 5 is an optically thinner medium, and the light-gathering body 31 and the diffusion layer 3 are optically denser media. As shown in fig. 4, the light ray 101 emitted from the first LED21 enters the light collector 31 vertically from the left side surface of the light collector 31 to become a light ray 102, and the light ray 102 is irradiated onto the right side surface of the light collector 31. The right side surface of the light collector 31 is the critical surface between the light collector 31 and the protective adhesive layer 5, and the light 102 irradiatesTo the right side of the concentrator 31, there is both reflection and refraction of the light ray 102 on the right side of the concentrator 31. The light 102 reflected by the right side of the light-gathering body 31 will exit from the first region 31, and the refracted light will enter the protective adhesive layer 5 to cause light loss. In order to avoid the light from being emitted from the light collector 31, the light 102 may be totally reflected on the right side surface of the light collector 31. The angle of incidence of the light ray 102 on the right hand side is α, and if the light ray 102 is totally emitted on the right hand side, according to optical principles:
as shown in fig. 4, the cone angle of the condenser 31 is Φ, and Φ is α in fig. 4.
It is easy to understand that, according to the principle of refraction and reflection of the light path, when the light 101 is the light at the light-emitting angle β of the first LED21, the light within the light-emitting angle β of the first LED21 enters the light-gathering body 31 and is refracted onto the right side of the light-gathering body, and can be totally reflected and emitted from the first region 32, so as to ensure the light-gathering effect of the light-gathering body 31.
In this embodiment, the diffusion layer 3 and the condenser 31 are made of transparent polyethylene terephthalate (PET), and the refractive indexes n of the diffusion layer 3 and the condenser 31 are set to be equal to each other2About 1.655, and the diffusion layer 3 and concentrator 31 have a light transmittance of about 90%. The material of the protective adhesive layer 5 is heat-conducting silica gel, and the refractive index n of the protective adhesive layer 51Is about 1.496.
The cone angle of the light concentrator 31 can be obtained by combining the light emitting angle of the LED2, the distance from the cone point of the light concentrator 31 to the reflective layer 12, and other factors, and the refraction and reflection principles of light.
In the present embodiment, the cone angle Φ of the condenser 31 is 60 ° to 90 °.
Fig. 5 is a schematic diagram of the optical path when the cone angle of the condenser is 60 °. As shown in fig. 5, at this time, the light emitting angle of the LED2 is 120 °, the side length of the light collector 31 is 0.2mm, the distance between two adjacent light collectors 31 is 0.2mm, and the taper point of the light collector 31 and the reflective layerIs about 0.11mm, the lateral distance of the LED2 from the point of taper of the concentrator 31 is about 0.2mm, and the distance between the lower surface of the diffuser layer 3 and the reflective layer is about 0.29 mm. The light ray 103 enters the light collector 31 from the left side of the light collector 31, is refracted in the light collector 31, and then exits from the first region 32. The incident angle of the light ray 103 is θ1Angle of refraction theta2. When the light ray 103 enters the condenser 31 from the upper end point of the left side edge of the condenser, θ can be obtained1maxAbout 22 deg., theta2maxAbout 20. The light ray 104 is a light ray at an angle of 120 ° to the emission angle of the LED2, and the light ray 104 is incident perpendicularly into the concentrator 31. Practice proves that when the backlight module meets the parameters shown in fig. 5, 80% of light entering the light-gathering body 31 from one side surface of the light-gathering body 31 and refracted to the other side surface is totally reflected, so that the luminous flux of a mixed light shadow area between two adjacent LEDs 2 is increased, the brightness of an area between two adjacent LEDs 3 is increased, and Hotspot is reduced.
Fig. 6 is a schematic diagram of the optical path when the cone angle of the condenser is 90 °. As shown in fig. 6, at this time, the light emitting angle of the LED2 is 120 °, the distance between two adjacent light collectors 31 is 0.2mm, the distance between the tapered point of the light collector 31 and the reflective layer is about 0.14mm, the lateral distance between the LED2 and the tapered point of the light collector 31 is about 0.24mm, and the distance between the lower surface of the diffusion layer 3 and the reflective layer is about 0.28 mm. The incident angle of the light ray 103 is θ1Angle of refraction theta2. When the light ray 103 enters the condenser 31 from the upper end point of the left side edge of the condenser, θ can be obtained1maxAbout 25 deg., theta2maxAbout 22.5. The light ray 104 is a light ray with a light emitting angle of 120 ° of the LED2, and the light ray 104 irradiates the lower end point of the left side of the light-gathering body 31. Practice proves that when the backlight module meets the parameters shown in fig. 5, about 80% of light entering the light-gathering body 31 from one side surface of the light-gathering body 31 and refracted to the other side surface generates total reflection, so that the luminous flux of a mixed light shadow area between two adjacent LEDs 2 is increased, the brightness of an area between two adjacent LEDs 3 is increased, and Hotspot is reduced.
In the present embodiment, as shown in fig. 4, the cone angle Φ of the light collector 31 may be
n2＝1.655，n1When 1.496, Φ becomes 60 °. When the light emitting angle β of the LED2 is 120 °, light entering the condenser 31 from one side of the condenser 31 and refracted to the other side almost generates total reflection.
In the embodiment of the present invention, the diffusion layer 3 and the light collector 31 are made of transparent polyethylene terephthalate (PET), and the protective adhesive layer 5 is made of heat conductive silica gel, so the manufacturing process of the backlight module may include:
the LEDs are arranged on the back plate, specifically, Mini LED chips are mounted on the back plate 1 by using a point crystal process, as shown in fig. 7, and fig. 7 is a schematic structural diagram after the LEDs are formed in the process of forming the backlight module.
And forming a protective adhesive layer on the back plate with the LEDs by adopting a coating method, specifically, uniformly coating heat-conducting silica gel on the back plate 1 with the Mini LEDs by adopting a line dispensing process, wherein the coating thickness is about 0.3mm, and forming a protective adhesive layer 5.
And processing the protective adhesive layer to semi-cure the protective adhesive layer, specifically, irradiating the protective adhesive layer by adopting ultraviolet light, and controlling the energy ratio and the irradiation time of the ultraviolet light to semi-cure the protective adhesive layer 5.
Specifically, the grooves between the adjacent LEDs are formed on the upper surface of the protective adhesive layer by a preset imprinting mold and an imprinting process on the upper surface of the protective adhesive layer 5, and the grooves 51 between the adjacent LEDs are formed on the upper surface of the protective adhesive layer 5, as shown in fig. 8, fig. 8 is a schematic structural diagram after the grooves are formed in the backlight module forming process.
Coating on the protection glue layer and forming a light gathering body and a diffusion layer, wherein the light gathering body is embedded into the groove, specifically, after the protection glue layer 5 is completely cured, coating PET on the protection glue layer 5 by adopting a line dispensing process, integrally forming the light gathering body 31 and the diffusion layer 3, embedding the light gathering body into the groove 51, and the thickness of the diffusion layer 3 is about 0.1mm, as shown in figure 1.
Second embodiment:
based on the inventive concept of the foregoing embodiments, an embodiment of the present invention further provides a display device, which includes the backlight module according to the foregoing embodiments. The display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
In the description of the embodiments of the present invention, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A backlight module is characterized by comprising a back plate, a plurality of LEDs arranged on the back plate at intervals and a light gathering body arranged between the adjacent LEDs, wherein the light gathering body can enable at least part of light rays emitted by the LEDs positioned around the light gathering body to be converged after being emitted from the surface of the light gathering body and then emitted from the light gathering body;
the LEDs in two adjacent rows or two adjacent columns are arranged in a staggered mode, and the row spacing of the LEDs in two adjacent rows is equal to the column spacing of the LEDs in two adjacent columns; each light condenser is positioned between two adjacent LEDs in the row direction and between two adjacent LEDs in the column direction;
the light gathering body is an inverted cone or an inverted cone table, and the cone angle of the light gathering body is 60-90 degrees.
2. The backlight module according to claim 1, further comprising a diffusion layer disposed on a side of the LED facing away from the back plate, wherein the light-gathering body is a protrusion protruding from a surface of the diffusion layer facing the LED toward the back plate, at least a portion of the light emitted from the LED enters the light-gathering body from a side surface of the light-gathering body and sequentially passes through the light-gathering body and the diffusion layer to be emitted, and another portion of the light emitted from the LED passes through the diffusion layer to be emitted.
3. The backlight module as claimed in claim 1, wherein the front projection edge of the light-gathering body on the back plate is connected with the front projection edge of the surrounding LEDs on the back plate.
4. A backlight module according to claim 2, wherein the back plate comprises a substrate and a reflective layer disposed on a side of the substrate facing the diffuser layer.
5. The backlight module according to claim 2, further comprising a protective adhesive layer covering the LEDs, wherein the protective adhesive layer is provided with grooves corresponding to the light collectors, the diffusion layer is attached to the protective adhesive layer, and the light collectors are embedded in the corresponding grooves.
6. The backlight module of claim 5, wherein the refractive index of the protective adhesive layer is less than the refractive index of the light collector.
7. The backlight module as claimed in claim 1, wherein the LED has an angle of 120 ° and the bottom of the light concentrator is lower than the top of the LED.
8. A method for manufacturing a backlight module is characterized by comprising the following steps:
arranging the LEDs on the back plate;
forming a protective adhesive layer on the back plate on which the LED is formed by adopting a coating method;
processing the protective adhesive layer to semi-cure the protective adhesive layer;
forming a groove between adjacent LEDs on the upper surface of the protective adhesive layer;
coating the protective adhesive layer to form a light gathering body and a diffusion layer, wherein the light gathering body is embedded into the groove;
the LEDs in two adjacent rows or two adjacent columns are arranged in a staggered mode, and the row spacing of the LEDs in two adjacent rows is equal to the column spacing of the LEDs in two adjacent columns; each light condenser is positioned between two adjacent LEDs in the row direction and between two adjacent LEDs in the column direction;
the light gathering body is an inverted cone or an inverted cone table, and the cone angle of the light gathering body is 60-90 degrees.
9. A display device comprising the backlight module according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910175979.9A CN109754711B (en) | 2019-03-08 | 2019-03-08 | Backlight module, preparation method thereof and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910175979.9A CN109754711B (en) | 2019-03-08 | 2019-03-08 | Backlight module, preparation method thereof and display device |
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| Publication Number | Publication Date |
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| CN109754711A CN109754711A (en) | 2019-05-14 |
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| CN110456574A (en) * | 2019-09-20 | 2019-11-15 | 青岛海信电器股份有限公司 | A kind of display device and backlight module |
| CN112987408A (en) * | 2021-04-01 | 2021-06-18 | 深圳Tcl新技术有限公司 | Backlight module and display panel |
| CN113138493B (en) * | 2021-04-07 | 2022-09-27 | 武汉华星光电技术有限公司 | Backlight module and manufacturing method thereof |
| CN114464604B (en) * | 2021-07-16 | 2023-04-11 | 荣耀终端有限公司 | Display device, electronic equipment and packaging method of backlight module |
| CN115629496B (en) * | 2022-08-18 | 2024-05-17 | 京东方科技集团股份有限公司 | Backlight module, preparation method thereof and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102913825A (en) * | 2012-11-02 | 2013-02-06 | 京东方科技集团股份有限公司 | Illumination unit, backlight module and display device |
| CN106896584A (en) * | 2017-05-05 | 2017-06-27 | 武汉华星光电技术有限公司 | LED light bar and backlight assembly |
| CN109143687A (en) * | 2018-09-30 | 2019-01-04 | 厦门天马微电子有限公司 | Backlight module, liquid crystal display die set and electronic equipment |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527115A (en) * | 2009-02-19 | 2009-09-09 | 深圳市画佳电子有限公司 | LED display unit |
| CN101872816A (en) * | 2009-04-23 | 2010-10-27 | 友达光电股份有限公司 | Light-emitting diode and back light module |
| US20120113621A1 (en) * | 2010-11-10 | 2012-05-10 | Taiwan Semiconductor Manufacturing Company, Ltd. | Batwing beam based led and backlight module using the same |
| CN107461666A (en) * | 2017-08-17 | 2017-12-12 | 苏州每日农业科技有限公司 | A kind of great power LED plant illumination module |
| CN107731122A (en) * | 2017-11-28 | 2018-02-23 | 深圳市秀狐科技有限公司 | A kind of gelatin LED display and its processing method |
| CN108519639A (en) * | 2018-04-18 | 2018-09-11 | 京东方科技集团股份有限公司 | Guide-lighting membrane material, down straight aphototropism mode set and display device |
| CN108535916B (en) * | 2018-04-20 | 2020-04-28 | 武汉华星光电技术有限公司 | Direct type backlight module and manufacturing method thereof |
| CN109031784A (en) * | 2018-08-23 | 2018-12-18 | 厦门天马微电子有限公司 | LED backlight and backlight source module and display device |
-
2019
- 2019-03-08 CN CN201910175979.9A patent/CN109754711B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102913825A (en) * | 2012-11-02 | 2013-02-06 | 京东方科技集团股份有限公司 | Illumination unit, backlight module and display device |
| CN106896584A (en) * | 2017-05-05 | 2017-06-27 | 武汉华星光电技术有限公司 | LED light bar and backlight assembly |
| CN109143687A (en) * | 2018-09-30 | 2019-01-04 | 厦门天马微电子有限公司 | Backlight module, liquid crystal display die set and electronic equipment |
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