CN213399134U - Yellow fluorescent backlight module based on four-chip-string blue-light LED matching - Google Patents

Abstract

The utility model discloses a match yellow fluorescence backlight unit based on four brilliant cluster blue light LED, including backplate, PCB board, reflection paper, LED lamp pearl, lens, diffuser plate, quantum dot membrane, prism piece, diffusion piece, LCD screen, extinction silk screen printing; the back plate is provided with a PCB board, and the PCB board is provided with LED lamp beads and a lens; the LED lamp beads are positioned right below the lens; four LED chips are arranged in the LED lamp bead and connected in series between the anode pin and the cathode pin; the PCB is provided with a plurality of LED lamp beads, and yellow fluorescent screen printing is arranged on the PCB around the outer sides of the LED lamp beads; the yellow fluorescent screen printing is arranged along the LED lamp beads in a circular matrix; the yellow fluorescent screen printing is rectangular; the lens is provided with a diffusion plate, a quantum dot film, a prism sheet, a diffusion sheet and a liquid crystal screen in sequence. The utility model has the characteristics of luminance is high, and is with low costs, and process velocity is fast, and the light-emitting is even.

Description

Yellow fluorescent backlight module based on four-chip-string blue-light LED matching

Technical Field

The utility model relates to a based on four brilliant cluster blue light LED collocation yellow fluorescence backlight unit, especially one kind has the luminance height, and is with low costs, and the process velocity is fast, and the light-emitting is even based on four brilliant cluster blue light LED collocation yellow fluorescence backlight unit.

Background

With the development of the current society, the television industry is rapidly developing in China, so that the television related technology is rapidly updated. In the current television industry, backlight modules are important components of LCD televisions and provide efficient backlight sources for liquid crystals. The classification by LEDs of the backlight can be divided into: the technologies of the OLED backlight and the QLED backlight are mature at present, and the television of the QLED backlight also enters the stage of mass production, but due to the limitations of board expansion, brightness and the like, the QLED backlight has a large development space. The qled (quantum Dot light Emitting diode), i.e. the quantum screen display technology, has great advantages compared with the conventional LCD tv: higher color conversion efficiency of the backlight system, lower manufacturing cost and the like, and the development of the domestic market is rapid. The backlight system of the QLED television adopts a blue LED to emit blue light, and high-purity white light is obtained through an optical material (QDEF membrane) attached with red and green quantum dots, so that a picture with a higher color gamut is restored.

The backlight LED in the market mostly uses a wafer with 3V voltage, in order to meet the requirements of high brightness and high voltage, a high-voltage chip is mostly adopted at present, the development difficulty of the high-voltage chip is higher, and the influence of factors such as a support, a lens and the like needs to be considered in a matching manner.

In the QLED backlight module, the light of the blue LED needs to be uniformly projected onto the QDEF film to form a high-quality white light source, but the conventional refractive or reflective type focuses a lot of blue light right above the lens, resulting in blue light above the lens. The requirement for the brightness of the backlight source is higher and higher, so that the improvement of the brightness of the backlight LED is an important development direction at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a have luminance height, with low costs, the process velocity is fast, and the even yellow fluorescence backlight unit based on four brilliant cluster blue light LED collocation of light-emitting.

The purpose of the utility model can be realized by the following technical scheme:

a yellow fluorescent backlight module based on matching of four-crystal-string blue LEDs comprises a back plate, a PCB (printed Circuit Board), reflecting paper, LED lamp beads, lenses, a diffusion plate, a quantum dot film, a prism sheet, a diffusion sheet, a liquid crystal screen and an extinction screen printing;

the back plate is provided with a PCB board, and the PCB board is provided with LED lamp beads and a lens; the LED lamp beads are positioned right below the lens;

four LED chips are arranged in the LED lamp bead and connected in series between the anode pin and the cathode pin;

the PCB is provided with a plurality of LED lamp beads, and yellow fluorescent screen printing is arranged on the PCB around the outer sides of the LED lamp beads; the yellow fluorescent screen printing is arranged along the LED lamp beads in a circular matrix; the yellow fluorescent screen printing is rectangular;

the lens is provided with a diffusion plate, a quantum dot film, a prism sheet, a diffusion sheet and a liquid crystal screen in sequence;

an extinction silk-screen is arranged below the diffusion plate and is positioned right above the LED lamp beads, and the shape of the extinction silk-screen is circular; the extinction screen printing is yellow ink screen printing;

the upper surface of the PCB is provided with a plurality of LED lamp bead welding pads which are arranged in a matrix manner along the PCB; a lens fixing column positioning area is arranged on the outer side of the LED lamp bead welding plate; a first test point positioning area and a second test point are arranged on the periphery of the PCB outside the LED lamp bead bonding pad; the two second test points are distributed on the upper surface of the PCB at two sides of the lens; the first test point positioning area is positioned on the upper surface of the PCB at one side of the lens; a conducting layer is arranged on the inner layer of the first test point positioning area; the first test point, the second test point and the LED lamp bead pad penetrate through the upper surface of the PCB and are communicated with a conductive layer in the PCB;

the LED lamp bead comprises an LED support, a groove is formed in the upper surface of the LED support, and an anode pin and a cathode pin are arranged on the bottom side of the groove; an insulating strip is arranged between the positive electrode pin and the negative electrode pin; four LED chips are mounted on the upper surface of the negative electrode pin, and the LED chips are connected in series to the positive electrode pin and the negative electrode pin through gold wires; the LED bracket on the inner side wall of the groove is formed with an inclined surface from bottom to top to outside; the bottom ends of the anode pin and the cathode pin extend to the outer side of the LED bracket;

the yellow fluorescent screen printing comprises a reflecting layer and a yellow fluorescent layer, wherein the reflecting layer is positioned on the upper surface of the PCB, and the yellow fluorescent layer is positioned on the upper surface of the reflecting layer; the upper surface of the reflecting layer is provided with a reflecting layer micro-prism which is of a saw-toothed cold-static structure; the upper surface of the light-emitting surface of the micro pyramid is provided with a plurality of micro-cone rough surfaces;

the tooth tip section angle of the reflective layer microprism is 5-15 degrees.

The utility model provides a yellow fluorescence backlight unit based on four brilliant cluster blue light LED collocation has luminance height, and is with low costs, and the process velocity is fast, the even characteristics of light-emitting. The utility model has the advantages that: the brightness and the voltage of the LED lamp bead are improved by connecting the four LED chips in series, so that a high-cost high-voltage chip is replaced, and the research and development cost of a product is reduced;

the LED chip in the LED lamp bead emits blue light, and the blue light is irradiated from the upper part of the LED lamp bead; white light irradiated by the LED lamp beads is diffused by the refraction type lens or the reflection type lens, and blue light is easily generated in the peripheral area of the diffusion plate right above the lens and the area of the diffusion plate right above the lens; blue light emitted above the LED lamp beads is subjected to yellow fluorescent screen printing preset on a PCB (printed circuit board) at the periphery of the LED lamp beads, so that the intensity of the blue light is reduced, the blue light irradiated on the diffusion plate by the LED lamp beads is not too strong in local energy, the condition of uneven light mixing through the quantum dot film is caused, and the light emitting uniformity of the backlight module is improved;

after light emitted by the LED lamp beads is refracted or scattered by the lens, the light emitting energy right above the lens is the highest, and the energy of blue light in the area is weakened through extinction silk-screen printing so as to improve the light emitting uniform effect of the area;

the current forms a loop with the anode pin, the cathode pin and the gold wire through the LED lamp bead bonding pad, and the LED chip is lightened; the LED chip emits blue light which is emitted from the groove and is emitted from the upper part of the groove through the transparent adhesive in the groove; the blue light irradiated on the light-gathering reflecting inner wall by the LED chip is reflected by the light-gathering reflecting inner wall and then is emitted from the upper part of the groove; the light extraction rate of the groove is improved; the brightness of the LED lamp beads is improved by the four LED chips, the highest display brightness of the backlight module is enhanced, and the highlight visibility of the backlight module is improved; the cost and the yield of the LED chips with the same brightness are reduced, and the research and development cost is greatly reduced;

the reflecting layer microprism is of a sawtooth-shaped cold-static structure, and the sharp tooth tip utilizes the total reflection of incident light to enhance the light-emitting rate of yellow fluorescent screen printing and reduce the loss of light energy; the upper surface of the light-emitting surface of the micro pyramid is provided with a plurality of micro-cone rough surfaces, the micro-cone light-emitting surface utilizes the silk-screen printing characteristic to adjust the yellow fluorescent slurry, the pores of the silk screen and the curing time, and the micro-cone rough surfaces are formed on the surface of the light-emitting surface of the micro pyramid, so that the diffuse reflection effect of yellow light emitted from the surface of the light-emitting surface of the micro pyramid in the yellow fluorescent silk-screen printing is improved, the yellow light reflected by the yellow fluorescent silk-screen printing is favorably and uniformly dispersed, and the light-emitting uniformity.

Drawings

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a PCB board of the present invention based on a four-die-string blue-light LED-collocated yellow fluorescent backlight module;

fig. 2 is a side cross-sectional view of a PCB board of the present invention based on a four-chip-string blue-light LED-collocated yellow fluorescent backlight module;

fig. 3 is a schematic diagram of a structure of an LED lamp bead based on a four-die-string blue-light LED matched yellow fluorescent backlight module of the present invention;

fig. 4 is a schematic structural view of a yellow fluorescent backlight module based on a four-die-string blue-light LED arrangement;

fig. 5 is an enlarged view of fig. 2 at a.

Detailed Description

The purpose of the utility model can be realized by the following technical scheme:

a yellow fluorescent backlight module based on four-crystal string blue light LEDs is matched, and is shown in figures 1-5, and comprises a back plate 1, a PCB 2, reflecting paper 3, LED lamp beads 4, a lens 5, a diffusion plate 6, a quantum dot film 7, a prism sheet 8, a diffusion sheet 9, a liquid crystal screen 10 and an extinction silk screen 11;

the back plate 1 is provided with a PCB (printed circuit board) 2, and the PCB 2 is provided with an LED lamp bead 4 and a lens 5; the LED lamp beads 4 are positioned under the lens 5;

four LED chips 46 are arranged in the LED lamp bead 4, and the four LED chips 46 are connected in series between the anode pin 43 and the cathode pin 44; the brightness and the voltage of the LED lamp beads 4 are improved by connecting the four LED chips 46 in series, so that high-cost high-voltage chips are replaced, and the research and development cost of products is reduced;

a plurality of LED lamp beads 4 are mounted on the PCB 2, and yellow fluorescent screen printing 26 is arranged on the PCB 2 around the outer sides of the LED lamp beads 4; the yellow fluorescent screen printing 26 is arranged along the LED lamp beads 4 in a circular matrix; the yellow fluorescent screen printing 26 is rectangular; the LED chip 46 in the LED lamp bead 4 emits blue light and irradiates from the upper part of the LED lamp bead 4; white light irradiated by the LED lamp beads 4 is diffused by the refraction type lens or the reflection type lens, and blue light is easily generated in the peripheral area of the diffusion plate 6 right above the lens 5 and the area of the diffusion plate 6 right above the lens 5; blue light emitted above the LED lamp beads 4 passes through a yellow fluorescent screen printing 26 preset on the PCB 2 at the periphery of the LED lamp beads 4, so that the intensity of the blue light is reduced, the blue light irradiated on the diffusion plate 6 by the LED lamp beads 4 is not too strong in local energy, the condition of uneven light mixing through the quantum dot film 7 is caused, and the light-emitting uniformity of the backlight module is improved;

the lens 5 is provided with a diffusion plate 6, a quantum dot film 7, a prism sheet 8, a diffusion sheet 9 and a liquid crystal screen 10 in sequence; the diffusion plate 6 uniformly disperses the blue light irradiated by the lens 5 after diffusion and irradiates the blue light into the quantum dot film 7; the blue light excites the quantum dot fluorescent material in the quantum dot film 7 to respectively form red light and green light, the red light, the green light and the blue light are mixed to form white light, and the white light is emitted from the upper surface of the quantum dot film 7 and enters the prism sheet 8; the surface of the prism sheet 8 is provided with a micro prism structure, and the geometrical optical function of the micro prism structure is emitted from the upper surface of the prism sheet 8 in the front view direction and enters the diffusion sheet 9; the diffusion sheet 9 further uniformly diffuses the incident light, and then irradiates the liquid crystal screen 10 to illuminate the content displayed on the liquid crystal screen 10;

an extinction silk-screen 11 is arranged below the diffusion plate 6, the extinction silk-screen 11 is positioned right above the LED lamp beads 4, and the shape of the extinction silk-screen 11 is circular; the extinction silk-screen printing 11 is yellow ink silk-screen printing; after light emitted by the LED lamp beads 4 is refracted or scattered by the lens 5, the light emitting energy right above the lens 5 is the highest, and the energy of blue light in the area is weakened through the extinction silk screen printing 11, so that the light emitting uniformity effect of the area is improved;

the upper surface of the PCB 2 is provided with a plurality of LED lamp bead bonding pads 22, and the LED lamp bead bonding pads 22 are arranged along the PCB 2 in a matrix manner; a lens fixing column positioning area 23 is arranged on the outer side of the LED lamp bead bonding pad 22, and the lens 5 is adhered to the lens fixing column positioning area 23 through adhesive; a first test point positioning area 21 and a second test point 25 are arranged on the periphery of the PCB 2 outside the LED lamp bead bonding pad 22; the two second test points 25 are distributed on the upper surface of the PCB 2 at two sides of the lens 5; the first test point positioning area 21 is positioned on the upper surface of the PCB 2 at one side of the lens 5; a conductive layer 27 is arranged on the inner layer of the first test point positioning area 21; the first test point 24, the second test point 25 and the LED lamp bead pad 22 all penetrate through the upper surface of the PCB 2 and are communicated with a conducting layer 27 in the PCB 2; the PCB 2 is powered by a driving power supply, and a plurality of LED lamp beads 4 on the PCB 2 are lightened, so that the backlight module works and displays; the worker detects the LED lamp beads 4 between the two second test points 25 through the two adjacent second test points 25 on the two sides of the LED lamp bead bonding pad 22; through the detection point arranged at one end of the PCB 2 and a certain second detection point 25 on the PCB 2, a circuit formed by the LED lamp beads 4 and the conducting layer 27 between the detection point and the second detection point 25 is detected, so that a worker can conveniently and quickly overhaul the PCB 2 and the LED lamp beads 4 on the PCB 2;

the LED lamp bead 4 comprises an LED support 41, a groove 42 is formed in the upper surface of the LED support 41, and an anode pin 43 and a cathode pin 44 are arranged on the bottom side of the groove 42; an insulating strip is arranged between the positive electrode pin 43 and the negative electrode pin 44; four LED chips 46 are arranged on the upper surface of the negative electrode pin 44, and the LED chips 46 are connected in series to the positive electrode pin 43 and the negative electrode pin 44 through gold wires 47; the LED bracket 41 on the inner side wall of the groove 42 is formed with an outward inclined surface from bottom to top; the bottom ends of the anode pin 43 and the cathode pin 44 extend to the outer side of the LED bracket 41; the current forms a loop with the anode pin 43, the cathode pin 44 and the gold wire 47 through the LED lamp bead bonding pad 22, and the LED chip 46 is lightened; blue light emitted by the LED chip 46 is emitted from above the groove 42 through the transparent adhesive in the groove 42; the blue light irradiated on the light-gathering reflecting inner wall 45 by the LED chip 46 is reflected by the light-gathering reflecting inner wall 45 and then emitted from the upper part of the groove 42; the light extraction rate of the groove 42 is improved; the four LED chips 46 improve the brightness of the LED lamp beads 4, enhance the highest display brightness of the backlight module and improve the highlight visibility of the backlight module; the cost and the yield of the LED chips with the same brightness are reduced, and the research and development cost is greatly reduced;

the yellow fluorescent screen printing 26 comprises a reflecting layer 261 and a yellow fluorescent layer 262, wherein the reflecting layer 261 is located on the upper surface of the PCB 2, and the yellow fluorescent layer 262 is located on the upper surface of the reflecting layer 261; the upper surface of the reflecting layer 261 is provided with a reflecting layer microprism 263, the reflecting layer microprism 263 is of a sawtooth-shaped cold-static structure, and a sharp tooth tip utilizes total reflection of incident light to enhance the light-emitting rate of the yellow fluorescent screen printing 26 and reduce the light energy loss; the upper surface of the micro pyramid light-emitting surface 264 is provided with a plurality of micro pyramid rough surfaces, the micro pyramid light-emitting surface 264 utilizes the silk-screen printing characteristic to adjust yellow fluorescent slurry, the pores of a silk screen and the curing time, and the micro pyramid rough surfaces are formed on the surface of the micro pyramid light-emitting surface 264, so that the diffuse reflection effect of yellow light in the yellow fluorescent silk-screen 26 when the yellow light is emitted from the surface of the micro pyramid light-emitting surface 264 is improved, the yellow light reflected by the yellow fluorescent silk-screen 26 is favorably and uniformly dispersed, and the light-emitting uniformity of the backlight module is further improved;

the section angle of the tooth tip of the reflecting layer microprism 263 is 5-15 degrees;

the reflecting layer 261 is made of ultraviolet curing glue, the ultraviolet curing glue is printed on the upper surface of the PCB 2 through screen printing, then ultraviolet light is rapidly adopted for irradiation and curing, and a reflecting layer microprism 263 is formed on the upper surface of the reflecting layer 261; the yellow fluorescent layer 262 is prepared by mixing ultraviolet curing glue and yellow fluorescent powder, the upper surface of the reflective layer 261 is subjected to silk-screen printing through mixed paste of the ultraviolet curing glue and the yellow fluorescent powder, and then the reflective layer 261 and the micro-pyramid light-emitting surface 264 are formed through ultraviolet irradiation curing; the yellow fluorescent screen printing 26 is cured by ultraviolet to shorten the curing processing time.

The utility model discloses a theory of operation:

the utility model is provided with a PCB board 2 on a back board 1, and the PCB board 2 is provided with an LED lamp bead 4 and a lens 5; the LED lamp beads 4 are positioned under the lens 5;

the brightness and the voltage of the LED lamp beads 4 are improved by connecting the four LED chips 46 in series, so that high-cost high-voltage chips are replaced, and the research and development cost of products is reduced;

the LED chip 46 in the LED lamp bead 4 emits blue light and irradiates from the upper part of the LED lamp bead 4; white light irradiated by the LED lamp beads 4 is diffused by the refraction type lens or the reflection type lens, and blue light is easily generated in the peripheral area of the diffusion plate 6 right above the lens 5 and the area of the diffusion plate 6 right above the lens 5; blue light emitted above the LED lamp beads 4 passes through a yellow fluorescent screen printing 26 preset on the PCB 2 at the periphery of the LED lamp beads 4, so that the intensity of the blue light is reduced, the blue light irradiated on the diffusion plate 6 by the LED lamp beads 4 is not too strong in local energy, the condition of uneven light mixing through the quantum dot film 7 is caused, and the light-emitting uniformity of the backlight module is improved;

the diffusion plate 6 uniformly disperses the blue light irradiated by the lens 5 after diffusion and irradiates the blue light into the quantum dot film 7; the blue light excites the quantum dot fluorescent material in the quantum dot film 7 to respectively form red light and green light, the red light, the green light and the blue light are mixed to form white light, and the white light is emitted from the upper surface of the quantum dot film 7 and enters the prism sheet 8; the surface of the prism sheet 8 is provided with a micro prism structure, and the geometrical optical function of the micro prism structure is emitted from the upper surface of the prism sheet 8 in the front view direction and enters the diffusion sheet 9; the diffusion sheet 9 further uniformly diffuses the incident light, and then irradiates the liquid crystal screen 10 to illuminate the content displayed on the liquid crystal screen 10;

after light emitted by the LED lamp beads 4 is refracted or scattered by the lens 5, the light emitting energy right above the lens 5 is the highest, and the energy of blue light in the area is weakened through the extinction silk screen printing 11, so that the light emitting uniformity effect of the area is improved;

the PCB 2 is powered by a driving power supply, and a plurality of LED lamp beads 4 on the PCB 2 are lightened, so that the backlight module works and displays; the worker detects the LED lamp beads 4 between the two second test points 25 through the two adjacent second test points 25 on the two sides of the LED lamp bead bonding pad 22; through the detection point arranged at one end of the PCB 2 and a certain second detection point 25 on the PCB 2, a circuit formed by the LED lamp beads 4 and the conducting layer 27 between the detection point and the second detection point 25 is detected, so that a worker can conveniently and quickly overhaul the PCB 2 and the LED lamp beads 4 on the PCB 2;

the current forms a loop with the anode pin 43, the cathode pin 44 and the gold wire 47 through the LED lamp bead bonding pad 22, and the LED chip 46 is lightened; blue light emitted by the LED chip 46 is emitted from above the groove 42 through the transparent adhesive in the groove 42; the blue light irradiated on the light-gathering reflecting inner wall 45 by the LED chip 46 is reflected by the light-gathering reflecting inner wall 45 and then emitted from the upper part of the groove 42; the light extraction rate of the groove 42 is improved; the four LED chips 46 improve the brightness of the LED lamp beads 4, enhance the highest display brightness of the backlight module and improve the highlight visibility of the backlight module; the cost and the yield of the LED chips with the same brightness are reduced, and the research and development cost is greatly reduced;

the reflecting layer microprism 263 is of a sawtooth-shaped cold-static structure, and the sharp tooth tip utilizes the total reflection of incident light to enhance the light-emitting rate of the yellow fluorescent screen printing 26 and reduce the loss of light energy; the upper surface of the micro pyramid light-emitting surface 264 is provided with a plurality of micro pyramid rough surfaces, the micro pyramid light-emitting surface 264 utilizes the silk-screen printing characteristic to adjust the yellow fluorescent slurry, the pores of the silk screen and the curing time, and the micro pyramid rough surfaces are formed on the surface of the micro pyramid light-emitting surface 264, so that the diffuse reflection effect of yellow light in the yellow fluorescent silk-screen 26 when the yellow light is emitted from the surface of the micro pyramid light-emitting surface 264 is improved, the yellow light reflected by the yellow fluorescent silk-screen 26 is favorably and uniformly dispersed, and the light-emitting uniformity of the backlight module is further.

The utility model provides a yellow fluorescence backlight unit based on four brilliant cluster blue light LED collocation has luminance height, and is with low costs, and the process velocity is fast, the even characteristics of light-emitting. The utility model has the advantages that: the brightness and the voltage of the LED lamp bead are improved by connecting the four LED chips in series, so that a high-cost high-voltage chip is replaced, and the research and development cost of a product is reduced;

the LED chip in the LED lamp bead emits blue light, and the blue light is irradiated from the upper part of the LED lamp bead; white light irradiated by the LED lamp beads is diffused by the refraction type lens or the reflection type lens, and blue light is easily generated in the peripheral area of the diffusion plate right above the lens and the area of the diffusion plate right above the lens; blue light emitted above the LED lamp beads is subjected to yellow fluorescent screen printing preset on a PCB (printed circuit board) at the periphery of the LED lamp beads, so that the intensity of the blue light is reduced, the blue light irradiated on the diffusion plate by the LED lamp beads is not too strong in local energy, the condition of uneven light mixing through the quantum dot film is caused, and the light emitting uniformity of the backlight module is improved;

after light emitted by the LED lamp beads is refracted or scattered by the lens, the light emitting energy right above the lens is the highest, and the energy of blue light in the area is weakened through extinction silk-screen printing so as to improve the light emitting uniform effect of the area;

the current forms a loop with the anode pin, the cathode pin and the gold wire through the LED lamp bead bonding pad, and the LED chip is lightened; the LED chip emits blue light which is emitted from the groove and is emitted from the upper part of the groove through the transparent adhesive in the groove; the blue light irradiated on the light-gathering reflecting inner wall by the LED chip is reflected by the light-gathering reflecting inner wall and then is emitted from the upper part of the groove; the light extraction rate of the groove is improved; the brightness of the LED lamp beads is improved by the four LED chips, the highest display brightness of the backlight module is enhanced, and the highlight visibility of the backlight module is improved; the cost and the yield of the LED chips with the same brightness are reduced, and the research and development cost is greatly reduced;

the reflecting layer microprism is of a sawtooth-shaped cold-static structure, and the sharp tooth tip utilizes the total reflection of incident light to enhance the light-emitting rate of yellow fluorescent screen printing and reduce the loss of light energy; the upper surface of the light-emitting surface of the micro pyramid is provided with a plurality of micro-cone rough surfaces, the micro-cone light-emitting surface utilizes the silk-screen printing characteristic to adjust the yellow fluorescent slurry, the pores of the silk screen and the curing time, and the micro-cone rough surfaces are formed on the surface of the light-emitting surface of the micro pyramid, so that the diffuse reflection effect of yellow light emitted from the surface of the light-emitting surface of the micro pyramid in the yellow fluorescent silk-screen printing is improved, the yellow light reflected by the yellow fluorescent silk-screen printing is favorably and uniformly dispersed, and the light-emitting uniformity.

The foregoing is merely exemplary and illustrative of the structure of the invention, and various modifications, additions and substitutions as described in the detailed description may be made by those skilled in the art without departing from the structure or exceeding the scope of the invention as defined in the claims.

Claims (7)

1. A yellow fluorescent backlight module based on matching of four-crystal-string blue LEDs comprises a back plate (1), a PCB (printed circuit board) plate (2), reflecting paper (3), LED lamp beads (4), a lens (5), a diffusion plate (6), a quantum dot film (7), a prism sheet (8), a diffusion sheet (9), a liquid crystal screen (10) and a light extinction screen printing (11), and is characterized in that;

the back plate (1) is provided with a PCB (2), and the PCB (2) is provided with an LED lamp bead (4) and a lens (5); the LED lamp beads (4) are positioned right below the lens (5);

four LED chips (46) are arranged in the LED lamp bead (4), and the four LED chips (46) are connected in series between the positive electrode pin (43) and the negative electrode pin (44);

a plurality of LED lamp beads (4) are mounted on the PCB (2), and yellow fluorescent screen printing (26) is arranged on the PCB (2) around the outer sides of the LED lamp beads (4); the yellow fluorescent silk screen (26) is arranged along the LED lamp beads (4) in a circular matrix; the yellow fluorescent screen printing (26) is rectangular.

2. The backlight module based on the matching of the four-crystal string blue LED and the yellow fluorescent backlight module as claimed in claim 1, wherein the lens (5) is sequentially provided with a diffusion plate (6), a quantum dot film (7), a prism sheet (8), a diffusion sheet (9) and a liquid crystal screen (10).

3. The fluorescent backlight module based on the blue light LED collocation yellow fluorescent light of the four-crystal string as claimed in claim 1, wherein a extinction silk-screen (11) is arranged below the diffusion plate (6), the extinction silk-screen (11) is positioned right above the LED lamp beads (4), and the shape of the extinction silk-screen (11) is circular; the extinction silk screen printing (11) is yellow ink silk screen printing.

4. The yellow fluorescent backlight module based on the blue light LED collocation of the four-crystal string as claimed in claim 1, wherein a plurality of LED bead pads (22) are arranged on the upper surface of the PCB (2), and the LED bead pads (22) are arranged in a matrix along the PCB (2); a lens fixing column positioning area (23) is arranged on the outer side of the LED lamp bead bonding pad (22); a first test point positioning area (21) and a second test point (25) are arranged on the periphery of the PCB (2) outside the LED lamp bead bonding pad (22); the two second test points (25) are distributed on the upper surface of the PCB (2) at two sides of the lens (5); the first test point positioning area (21) is positioned on the upper surface of the PCB (2) on one side of the lens (5); a conductive layer (27) is arranged on the inner layer of the first test point positioning area (21); the first test point (24), the second test point (25) and the LED lamp bead pad (22) all penetrate through the upper surface of the PCB (2) and are communicated with a conducting layer (27) in the PCB (2).

5. The yellow fluorescent backlight module based on the blue light LED collocation of the four-crystal string as claimed in claim 1, wherein the LED lamp bead (4) comprises an LED support (41), a groove (42) is arranged on the upper surface of the LED support (41), and a positive electrode pin (43) and a negative electrode pin (44) are arranged on the bottom side of the groove (42); an insulating strip is arranged between the positive electrode pin (43) and the negative electrode pin (44); four LED chips (46) are arranged on the upper surface of the negative electrode pin (44), and the LED chips (46) are connected in series to the positive electrode pin (43) and the negative electrode pin (44) through gold wires (47); the LED bracket (41) on the inner side wall of the groove (42) is formed with an inclined surface from bottom to top to outside; the bottom ends of the anode pin (43) and the cathode pin (44) extend to the outer side of the LED bracket (41).

6. The backlight module based on the blue LED with yellow fluorescence of claim 1, wherein the yellow fluorescence silk screen (26) comprises a reflective layer (261) and a yellow fluorescent layer (262), the reflective layer (261) is located on the upper surface of the PCB (2), and the yellow fluorescent layer (262) is located on the upper surface of the reflective layer (261); the upper surface of the reflecting layer (261) is provided with a reflecting layer micro prism (263), and the reflecting layer micro prism (263) is of a sawtooth-shaped cold-static structure; the upper surface of the micro pyramid light-emitting surface (264) is provided with a plurality of micro-cone rough surfaces.

7. The backlight module of claim 6, wherein the cross-sectional angle of the tooth tip of the reflective layer micro-prism (263) is 5-15 °.

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