CN114200716A - Bottom light-emitting backlight without light guide plate - Google Patents

Bottom light-emitting backlight without light guide plate Download PDF

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Publication number
CN114200716A
CN114200716A CN202111515389.XA CN202111515389A CN114200716A CN 114200716 A CN114200716 A CN 114200716A CN 202111515389 A CN202111515389 A CN 202111515389A CN 114200716 A CN114200716 A CN 114200716A
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Prior art keywords
plate
heat dissipation
hole
circuit board
flexible circuit
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CN202111515389.XA
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Chinese (zh)
Inventor
魏黄梅
徐珍
江成
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Shenzhen Haojian New Material Co ltd
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Shenzhen Haojian New Material Co ltd
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Priority to CN202111515389.XA priority Critical patent/CN114200716A/en
Publication of CN114200716A publication Critical patent/CN114200716A/en
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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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133612—Electrical details
    • 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
    • G02F1/133628—Illuminating devices with cooling means

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

The invention provides a bottom light-emitting backlight source without a light guide plate, which comprises: the backlight source body, the backlight body includes the flexible circuit board, the flexible circuit board upper surface sets up a plurality of LED lamps, the outside cover of LED lamp is equipped with spotlight subassembly, form the spotlight chamber in the spotlight subassembly, the flexible circuit board lower surface sets up the heating panel, set up the cavity in the heating panel, the cavity pass through the connecting pipe with spotlight chamber intercommunication. According to the backlight source, the light condensing assembly is arranged, the traditional lens is omitted, light of the LED lamp is condensed, light of the backlight source body is more uniform, brightness and stability of the backlight source are improved, thickness of the bottom light-emitting backlight source is further reduced, heat generated by the LED lamp can be transmitted into the cavity of the heat dissipation plate through the connecting pipe, rapid heat dissipation is carried out through the heat dissipation plate, cooling of the backlight source is achieved, the LED lamp is not prone to damage, and service life of the backlight source body is prolonged.

Description

Bottom light-emitting backlight without light guide plate
Technical Field
The invention relates to the technical field of backlight sources, in particular to a bottom light-emitting backlight source without a light guide plate.
Background
Liquid crystal displays have been widely used in personal consumer products such as mobile phones, notebook computers, computer monitors, televisions, and the like, because of their advantages of light weight, small size, low power consumption, low radiation, good quality, and the like. Since the LCD panel itself does not have a light emitting property, a light emitting source must be added on the LCD panel to achieve the display effect, and the backlight module is an optical component for providing the backlight source of the LCD display.
The patent with the publication number of "CN 108267893B" discloses "a light guide plate-free bottom-lighting backlight", which includes: FPC, establish a plurality of LEDs on FPC, cladding LED's fluorescent layer, locate LED top is located lens of the inversion in the fluorescent layer introduces lens structure, deflects the light propagation angle by 90 degrees, but, add lens also can increase the thickness of backlight, lens angle change also can influence light deflection angle simultaneously for backlight light is inhomogeneous, backlight stability is relatively poor, and, the end is given out light still needs more LED lamp, more LED lamp during operation can produce a large amount of heats, and the heat can't be discharged from the backlight fast, cause the LED lamp to damage easily, shorten the life of backlight.
Disclosure of Invention
The invention provides a bottom light-emitting backlight without a light guide plate, which is used for solving the technical problems that the thickness of the backlight is increased by adding a lens at present, the light deflection angle is influenced by the change of the angle of the lens, so that the light of the backlight is not uniform, the stability of the backlight is poor, more LED lamps are still needed in the bottom light-emitting backlight, a large amount of heat is generated when more LED lamps work, the heat cannot be quickly discharged from the backlight, the LED lamps are easily damaged, and the service life of the backlight is shortened.
In order to solve the above technical problem, the present invention discloses a bottom emission backlight without light guide plate, comprising: the backlight source body, the backlight body includes the flexible circuit board, the flexible circuit board upper surface sets up a plurality of LED lamps, the outside cover of LED lamp is equipped with spotlight subassembly, form the spotlight chamber in the spotlight subassembly, the flexible circuit board lower surface sets up the heating panel, set up the cavity in the heating panel, the cavity pass through the connecting pipe with spotlight chamber intercommunication.
Preferably, a diffusion plate is arranged above the LED lamp, a lower diffusion sheet is arranged on the upper surface of the diffusion plate, a brightness enhancement sheet is arranged on the upper surface of the lower diffusion sheet, and an upper diffusion sheet is arranged on the upper surface of the brightness enhancement sheet.
Preferably, the upper surface of the flexible circuit board is further provided with a fixing frame, the LED lamp, the light condensing assembly, the diffusion plate, the lower diffusion sheet, the brightness enhancement sheet and the upper diffusion sheet are all arranged in the fixing frame, and the upper surface of the upper diffusion sheet is fixedly connected with the upper end of the fixing frame through shading glue.
Preferably, a plurality of the LED lamps are fixedly mounted on the upper surface of the flexible circuit board in an array distribution manner.
Preferably, the spotlight subassembly is formed by four isosceles trapezoid boards concatenation, four isosceles trapezoid board's waist limit connects gradually, isosceles trapezoid board slope sets up, isosceles trapezoid board is close to flexible circuit board one side sets up first base, isosceles trapezoid board is kept away from flexible circuit board one side sets up the second base, just first base length is less than second base length, four isosceles trapezoid board first base with flexible circuit board upper surface fixed connection, the second base with diffuser plate lower fixed surface is connected.
Preferably, the isosceles trapezoid plate with the included angle of flexible circuit board is the acute angle, just the size of isosceles trapezoid plate with the included angle of flexible circuit board should satisfy following formula:
Figure BDA0003406745020000021
wherein, theta0The included angle between the isosceles trapezoid plate and the flexible circuit board is set, arctan is an arctangent function, S is a preset horizontal distance between the center positions of two adjacent LED lamps, X is a first preset length of the isosceles trapezoid plate close to a first bottom edge of the flexible circuit board, and H is a vertical distance from the upper surface of the flexible circuit board to the upper surface of the backlight source body.
Preferably, the actual length of the second base line should satisfy the following formula:
Figure BDA0003406745020000031
y is the actual length of the second bottom edge, X is the first preset length of the isosceles trapezoid plate close to the first bottom edge of the flexible circuit board, H is the vertical distance from the upper surface of the flexible circuit board to the upper surface of the backlight source body, S is the preset horizontal distance between the center positions of two adjacent LED lamps, and H is the vertical distance from the second bottom edge to the upper surface of the flexible circuit board.
Preferably, the radiating holes are symmetrically formed in the left side wall and the right side wall of the radiating plate, one end of each radiating hole is communicated with the corresponding cavity, the other end of each radiating hole is communicated with the outside of the radiating plate, a mounting hole is formed in the center of the bottom of the radiating plate and penetrates through the bottom wall of the radiating plate, the cavities are communicated with the outside of the radiating plate through the mounting holes, and a radiating fan is arranged in each mounting hole.
Preferably, the heating panel left and right sides outer wall symmetry sets up dampproofing subassembly, dampproofing subassembly includes:
the left end and the right end of the fixing pipe are provided with openings, and one end of the fixing pipe close to the heat dissipation plate is fixedly connected with the side wall of the heat dissipation plate;
the baffle is arranged in the fixed pipe, the periphery of the baffle is fixedly connected with the inner wall of the fixed pipe, and the baffle is arranged at one end, close to the heat dissipation plate, of the fixed pipe;
the first through hole is formed in the baffle and penetrates through the left side wall and the right side wall of the baffle, and the first through hole is communicated with the heat dissipation hole;
the first stop block is arranged on one side, away from the heat dissipation plate, of the baffle plate, the first stop block is in a right trapezoid shape, one side of a right-angle edge of the first stop block is fixedly connected with the side wall of the baffle plate, one side, away from the baffle plate, of the first stop block is provided with a first inclined surface, the length of the upper end of the first stop block is smaller than that of the lower end of the first stop block, the height of the upper end of the first stop block is lower than that of the upper end of the first through hole, the height of the upper end of the first stop block is higher than that of the lower end of the first through hole, and the height of the lower end of the first stop block is lower than that of the lower end of the first through hole;
the blocking plate is arranged in the fixed pipe, the blocking plate is positioned on one side, away from the heat dissipation plate, of the baffle plate, and the periphery of the blocking plate is connected with the inner wall of the fixed pipe in a sliding mode;
the second through hole is formed in the plugging plate, penetrates through the left side wall and the right side wall of the plugging plate, one end of the second through hole is communicated with the outside of the fixed pipe, the other end of the second through hole is communicated with the inside of the fixed pipe, and the height of the second through hole is lower than that of the first through hole;
the second stop block is arranged on one side, close to the heat dissipation plate, of the blocking plate, the second stop block is in a right trapezoid shape, one side of the right-angle edge of the second stop block is fixedly connected with the side wall of the blocking plate, one side, far away from the blocking plate, of the second stop block is provided with a second inclined surface, the length of the upper end of the second stop block is larger than that of the lower end of the second stop block, the first inclined surface is matched with the second inclined surface, the height of the upper end of the second stop block is higher than that of the upper end of the second through hole, the height of the lower end of the second stop block is higher than that of the lower end of the second through hole, and the height of the lower end of the second stop block is lower than that of the upper end of the second through hole;
the flow channel is arranged on the bottom wall of the fixed pipe, the outlet end of the flow channel is communicated with the outside of the fixed pipe, the inlet end of the flow channel is communicated with the inside of the fixed pipe, and the inlet end of the flow channel is positioned between the plugging plate and the baffle plate;
the micro motor is arranged in the fixed pipe, the micro motor is positioned on one side, away from the heat dissipation plate, of the plugging plate, the bottom wall of the micro motor is fixedly connected with the inner wall of the fixed pipe, a screw rod is arranged at the output end of the micro motor, one end, away from the micro motor, of the screw rod penetrates through the plugging plate and is in rotating connection with the side wall of the baffle plate, and the screw rod is in threaded transmission connection with the plugging plate;
the guide rod, guide rod one end with the baffle is kept away from a heating panel lateral wall fixed connection, the guide rod other end run through the shutoff board and with micro motor upper end fixed connection, the guide rod with shutoff board run through position sliding connection.
Preferably, the heating panel diapire still sets up the air inlet, the air inlet is provided with two, two the air inlet is about heat dissipation fan bilateral symmetry, the heating panel below sets up radiator unit, radiator unit includes:
one end of the rotating shaft is fixedly connected with the central position of the output shaft of the heat dissipation fan, and a cam is arranged at one end of the rotating shaft, which is far away from the heat dissipation fan, and is fixedly connected with the rotating shaft;
the two boxes are symmetrically arranged on the left side and the right side of the heat dissipation fan, the upper surface of each box is fixedly connected with the bottom wall of the heat dissipation plate, one side of each box, close to the heat dissipation plate, is provided with an air outlet, the air outlet is communicated with the air inlet, a first one-way valve is arranged in the air outlet, one side of each box, far away from the heat dissipation fan, is provided with an air suction port, one end of each air suction port is communicated with the inside of the box, the other end of each air suction port is communicated with the outside of the box, and a second one-way valve is arranged in each air suction port;
the piston plate is arranged in the box body in a sliding mode and slides left and right along the inner wall of the box body;
the piston rod is arranged on one side, close to the heat dissipation fan, of the piston plate, one end of the piston rod is fixedly connected with the side wall of the piston plate, the other end of the piston rod penetrates through one side, close to the cam, of the box body, extends to the outside of the box body, and is provided with a push plate, the push plate is fixedly connected with the piston rod, and the outer wall of the cam is in intermittent contact with one side, close to the cam, of the push plate;
the spring is sleeved on the piston rod, one end of the spring is fixedly connected with the outer wall of the box body, and the other end of the spring is fixedly connected with the side wall of the push plate.
The technical scheme of the invention has the following advantages: the invention provides a bottom light-emitting backlight source without a light guide plate, which comprises: the backlight source body, the backlight body includes the flexible circuit board, the flexible circuit board upper surface sets up a plurality of LED lamps, the outside cover of LED lamp is equipped with spotlight subassembly, form the spotlight chamber in the spotlight subassembly, the flexible circuit board lower surface sets up the heating panel, set up the cavity in the heating panel, the cavity pass through the connecting pipe with spotlight chamber intercommunication. According to the backlight source, the light condensing assembly is arranged, the traditional lens is omitted, light of the LED lamp is condensed, light of the backlight source body is more uniform, brightness and stability of the backlight source are improved, thickness of the bottom light-emitting backlight source is further reduced, heat generated by the LED lamp can be transmitted into the cavity of the heat dissipation plate through the connecting pipe, rapid heat dissipation is carried out through the heat dissipation plate, cooling of the backlight source is achieved, the LED lamp is not prone to damage, and service life of the backlight source body is prolonged.
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 apparatus particularly pointed out in the written description and drawings thereof.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which 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 description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of an overall structure of a light guide plate-free bottom-emission backlight source according to the present invention;
FIG. 2 is a schematic diagram illustrating the light propagation of an LED lamp in a light-guide-plate-less bottom-emission backlight according to the present invention;
FIG. 3 is a top view of a light focusing assembly of the present invention;
FIG. 4 is a schematic view of a moisture barrier assembly of the present invention;
FIG. 5 is an enlarged view taken at A of FIG. 4 in accordance with the present invention;
FIG. 6 is a schematic view of a heat dissipation assembly according to the present invention.
In the figure: 1. a flexible circuit board; 2. an LED lamp; 3. a light-gathering cavity; 4. a heat dissipation plate; 5. a cavity; 6. a connecting pipe; 7. a diffusion plate; 8. a lower diffusion sheet; 9. a brightness enhancement film; 10. an upper diffusion sheet; 11. a fixing frame; 12. shading glue; 13. an isosceles trapezoidal plate; 14. heat dissipation holes; 15. mounting holes; 16. a heat dissipation fan; 17. a fixed tube; 18. a baffle plate; 19. a first through hole; 20. a first stopper; 21. a plugging plate; 22. a second through hole; 23. a second stopper; 24. a flow channel; 25. a micro motor; 26. a screw; 27. a guide bar; 28. an air inlet; 29. a rotating shaft; 30. a cam; 31. a box body; 32. an air outlet; 33. an air suction port; 34. a piston plate; 35. a piston rod; 36. pushing the plate; 37. a spring.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.
Example 1:
an embodiment of the present invention provides a light guide plate-free bottom emission backlight, as shown in fig. 1 to 6, including: the backlight source body, the backlight source body includes flexible circuit board 1, 1 upper surface of flexible circuit board sets up a plurality of LED lamps 2, 2 outside covers of LED lamp are equipped with spotlight component, form spotlight chamber 3 in the spotlight component, 1 lower surface of flexible circuit board sets up heating panel 4, set up cavity 5 in the heating panel 4, cavity 5 through connecting pipe 6 with spotlight chamber 3 intercommunication.
The working principle and the beneficial effects of the technical scheme are as follows: when the LED backlight source is used, the LED lamp 2 emits light on the flexible circuit board 1, the light emitted by the LED lamp 2 can be gathered through the light gathering component, and the light can be totally reflected through the light gathering component, so that a traditional lens is omitted, the light of the LED lamp 2 is gathered, the light emitting effect of the backlight source body is more uniform, the brightness and the stability of the backlight source are improved, the thickness of the bottom light emitting backlight source is further reduced, the product is more competitive, in addition, the LED lamp 2 is positioned in the light gathering cavity 3, the heat generated when the LED lamp 2 works can be gathered in the light gathering cavity 3, then the heat in the light gathering cavity 3 is transferred into the cavity 5 of the heat dissipation plate 4 through the connecting pipe 6, the heat dissipation plate 4 is made of heat conducting materials, the heat generated by the LED lamp 2 can be rapidly conducted out of the backlight source body through the heat dissipation plate 4, the purpose of rapid heat dissipation is achieved, and the cooling of the backlight source is realized, the LED lamp 2 is not easy to damage, and the service life of the backlight body is prolonged
Example 2
On the basis of the above embodiment 1, as shown in fig. 1, a diffusion plate 7 is disposed above the LED lamp 2, a lower diffusion sheet 8 is disposed on the upper surface of the diffusion plate 7, a brightness enhancement sheet 9 is disposed on the upper surface of the lower diffusion sheet 8, and an upper diffusion sheet 10 is disposed on the upper surface of the brightness enhancement sheet 9;
the upper surface of the flexible circuit board 1 is also provided with a fixed frame 11, the LED lamp 2, the light condensing assembly, the diffusion plate 7, the lower diffusion sheet 8, the brightness enhancement sheet 9 and the upper diffusion sheet 10 are all arranged in the fixed frame 11, and the upper surface of the upper diffusion sheet 10 is fixedly connected with the upper end of the fixed frame 11 through a light shielding glue 12;
the LED lamps 2 are fixedly arranged on the upper surface of the flexible circuit board 1 in an array distribution mode.
The working principle and the beneficial effects of the technical scheme are as follows: the diffusion plate 7 is arranged above the LED lamp 2, the diffusion plate 7 can homogenize the light emitted by the LED lamp 2, the diffusion plate 7 has heat resistance and high light transmittance, the light emitted by the LED lamp 2 can be diffused to the optimal state through the diffusion plate 7, the lower diffusion sheet 8 is arranged on the upper surface of the diffusion plate 7, the brightness enhancement sheet 9 is arranged on the upper surface of the lower diffusion sheet 8, the upper diffusion sheet 10 is arranged on the upper surface of the brightness enhancement sheet 9, the upper diffusion sheet 10 and the lower diffusion sheet 8 can further homogenize the light of the LED lamp 2, concretely, the lower diffusion sheet 8 is mainly used for light collection, screen dot or line light source shielding, the upper diffusion sheet 10 has high light transmittance, the brightness enhancement sheet 10 can protect the brightness enhancement sheet 9, improve the visual angle and increase the light source softness, the brightness enhancement sheet 9 is used for brightness enhancement, the LED lamp 2, the light gathering component, the diffusion plate 7, the lower diffusion sheet 8, the brightness enhancement sheet 9 and the upper diffusion sheet 10 are all arranged in the fixing frame 11, after the above components are fixed, the light-shielding glue 12 is stuck to the upper diffusion sheet 10 and the fixing frame 11, and the partial assembly of the backlight body is realized.
Example 3
On the basis of embodiment 2, as shown in fig. 2 and 3, the light condensing assembly is formed by splicing four isosceles trapezoid plates 13, waist edges of the four isosceles trapezoid plates 13 are sequentially connected, the isosceles trapezoid plates 13 are arranged in an inclined manner, a first bottom edge is arranged on one side of the isosceles trapezoid plates 13 close to the flexible circuit board 1, a second bottom edge is arranged on one side of the isosceles trapezoid plates 13 far away from the flexible circuit board 1, the length of the first bottom edge is smaller than that of the second bottom edge, the first bottom edges of the four isosceles trapezoid plates 13 are fixedly connected with the upper surface of the flexible circuit board 1, and the second bottom edge is fixedly connected with the lower surface of the diffusion plate 7;
isosceles trapezoid board 13 with the contained angle of flexible circuit board 1 is the acute angle, just isosceles trapezoid board 13 with the size of the contained angle of flexible circuit board 1 should satisfy following formula:
Figure BDA0003406745020000081
wherein, theta0Is the included angle between the isosceles trapezoid plate 13 and the flexible circuit board 1, arctan is an arctangent function, and S is two adjacent LEDsThe center positions of the lamps 2 are preset horizontal distances, X is a first preset length of the isosceles trapezoid-shaped plate 13 close to the first bottom edge of the flexible circuit board 1, and H is a vertical distance from the upper surface of the flexible circuit board 1 to the upper surface of the backlight source body;
the actual length of the second base line should satisfy the following formula:
Figure BDA0003406745020000091
y is the actual length of the second bottom edge, X is the first preset length of the isosceles trapezoid plate 13 close to the first bottom edge of the flexible circuit board 1, H is the vertical distance from the upper surface of the flexible circuit board 1 to the upper surface of the backlight body, S is the preset horizontal distance between the center positions of two adjacent LED lamps 2, and H is the vertical distance from the second bottom edge to the upper surface of the flexible circuit board 1.
The working principle and the beneficial effects of the technical scheme are as follows: the light condensing assembly is formed by splicing four isosceles trapezoid plates 13, the lower end of each isosceles trapezoid plate 13 is a first bottom edge, the upper end of each isosceles trapezoid plate 13 is a second bottom edge, a waist edge is arranged between the first bottom edge and the second bottom edge, the first bottom edge is fixedly connected with the upper surface of the flexible circuit board 1, the second bottom edge is fixedly connected with the lower surface of the diffusion plate 7, the waist edges of the four isosceles trapezoid plates 13 are sequentially connected, the isosceles trapezoid plates 13 are obliquely arranged, an acute angle is formed between the included angle of each isosceles trapezoid plate 13 and the flexible circuit board 1, the glass panel can be selected as the isosceles trapezoid plates 13, light emitted by the LED lamps 2 can be projected to the upper diffusion sheet 10 through the four isosceles trapezoid plates 13 and is square, light emitted by the two adjacent LED lamps 2 is mutually connected on the upper diffusion sheet 10, the whole upper diffusion sheet 10 is finally and completely paved, light emitted by the LED lamps 2 is more uniform, and cannot be superposed on the upper diffusion sheet 10, double images cannot occur, the light-emitting effect is optimal, and in order to ensure the optimal light-emitting effect, the size of the included angle between the isosceles trapezoid plate 13 and the flexible circuit board 1 is satisfied
Figure BDA0003406745020000092
E.g. adjacent toThe preset horizontal distance between the center positions of the two LED lamps 2 is 2mm, the first preset length of the first bottom edge is 1mm, the vertical distance from the upper surface of the flexible circuit board 1 to the upper surface of the backlight body, namely the vertical distance from the light rays emitted by the LED lamps 2 to the upper surface of the upper diffusion sheet 10 is 0.6mm, and then the included angle between the isosceles trapezoid plate 13 and the flexible circuit board 1 is arctan (1.2), therefore, when the isosceles trapezoid plate 13 is installed, the included angle between the isosceles trapezoid plate 13 and the flexible circuit board 1 is needed to be ensured to be arctan (1.2), in the patent CN108267893B, the thickness of the fluorescent layer is 0.3mm, the thickness of the lens is 0.2mm, in order to enable the thickness of the backlight body to be lower, under the condition that the included angle between the isosceles trapezoid plate 13 and the flexible circuit board 1 is arctan (1.2), the vertical distance from the second bottom edge to the upper surface of the flexible circuit board 1 is 0.3mm, and then the actual length of the second bottom edge
Figure BDA0003406745020000101
Calculate and can be 1.5mm, set up isosceles trapezoid board 13 according to above-mentioned requirement, through the setting of cancellation lens, alright further reduce the thickness of backlight body, guarantee simultaneously that the light that LED lamp 2 sent is more even.
Example 4
On the basis of embodiment 1, as shown in fig. 1, heat dissipation holes 14 are symmetrically arranged in the left side wall and the right side wall of the heat dissipation plate 4, one end of each heat dissipation hole 14 is communicated with the cavity 5, the other end of each heat dissipation hole 14 is communicated with the outside of the heat dissipation plate 4, a mounting hole 15 is arranged at the central position of the bottom of the heat dissipation plate 4, the mounting hole 15 penetrates through the bottom wall of the heat dissipation plate 4, the cavity 5 is communicated with the outside of the heat dissipation plate 4 through the mounting hole 15, and a heat dissipation fan 16 is arranged in the mounting hole 15.
The working principle and the beneficial effects of the technical scheme are as follows: both ends all are provided with louvre 14 about heating panel 4, set up mounting hole 15 in heating panel 4 bottom, heat in the cavity 5 can be discharged to heating panel 4 outside fast through louvre 14 and mounting hole 15, dispel the heat fast, set up heat dissipation fan 16 in mounting hole 15, after long time is predetermine in LED lamp 2 continuous work, 16 automatic start of heat dissipation fan, heat dissipation fan 16 can accelerate the thermal outflow of mounting hole 15 department, and 14 departments of louvre from both sides inhale the outside air, 5 inside gaseous flows and the change of cavity have been accelerated, further the radiating efficiency has been improved, the radiating effect has been strengthened, realize the rapid cooling of LED lamp 2, LED lamp 2 has been protected.
Example 5
In embodiment 4, as shown in fig. 4 and 5, the heat dissipating plate 4 has moisture-proof members symmetrically disposed on the outer walls of the left and right sides thereof, and the moisture-proof members include:
the left end and the right end of the fixing pipe 17 are provided with openings, and one end, close to the heat dissipation plate 4, of the fixing pipe 17 is fixedly connected with the side wall of the heat dissipation plate 4;
the baffle 18 is arranged in the fixed pipe 17, the periphery of the baffle 18 is fixedly connected with the inner wall of the fixed pipe 17, and the baffle 18 is arranged at one end, close to the heat dissipation plate 4, of the fixed pipe 17;
the first through hole 19 is arranged in the baffle 18, the first through hole 19 penetrates through the left side wall and the right side wall of the baffle 18, and the first through hole 19 is communicated with the heat dissipation hole 14;
the first stopper 20 is arranged on one side, far away from the heat dissipation plate 4, of the baffle plate 18, the first stopper 20 is in a right trapezoid shape, one side of the right-angle side of the first stopper 20 is fixedly connected with the side wall of the baffle plate 18, one side, far away from the baffle plate 18, of the first stopper 20 is provided with a first inclined surface, the length of the upper end of the first stopper 20 is smaller than that of the lower end of the first stopper 20, the height of the upper end of the first stopper 20 is lower than that of the upper end of the first through hole 19, the height of the upper end of the first stopper 20 is higher than that of the lower end of the first through hole 19, and the height of the lower end of the first stopper 20 is lower than that of the lower end of the first through hole 19;
the blocking plate 21 is arranged in the fixed pipe 17, the blocking plate 21 is positioned on one side, away from the heat dissipation plate 4, of the baffle plate 18, and the periphery of the blocking plate 21 is in sliding connection with the inner wall of the fixed pipe 17;
the second through hole 22 is arranged in the blocking plate 21, the second through hole 22 penetrates through the left side wall and the right side wall of the blocking plate 21, one end of the second through hole 22 is communicated with the outside of the fixed pipe 17, the other end of the second through hole 22 is communicated with the inside of the fixed pipe 17, and the height of the second through hole 22 is lower than that of the first through hole 19;
the second baffle 23 is arranged on one side, close to the heat dissipation plate 4, of the blocking plate 21, the second baffle 18 is in a right-angled trapezoid shape, one side of a right-angled edge of the second baffle 23 is fixedly connected with the side wall of the blocking plate 21, one side, far away from the blocking plate 21, of the second baffle 23 is provided with a second inclined surface, the length of the upper end of the second baffle 23 is greater than the length of the lower end of the second baffle 23, the first inclined surface is matched with the second inclined surface, the height of the upper end of the second baffle 23 is greater than the height of the upper end of the second through hole 22, the height of the lower end of the second baffle 23 is greater than the height of the lower end of the second through hole 22, and the height of the lower end of the second baffle 23 is less than the height of the upper end of the second through hole 22;
the flow channel 24 is arranged on the bottom wall of the fixed pipe 17, the outlet end of the flow channel 24 is communicated with the outside of the fixed pipe 17, the inlet end of the flow channel 24 is communicated with the inside of the fixed pipe 17, and the inlet end of the flow channel 24 is positioned between the plugging plate 21 and the baffle plate 18;
the micro motor 25 is arranged in the fixed pipe 17, the micro motor 25 is positioned on one side, away from the heat dissipation plate 4, of the blocking plate 21, the bottom wall of the micro motor 25 is fixedly connected with the inner wall of the fixed pipe 17, the output end of the micro motor 25 is provided with a screw 26, one end, away from the micro motor 25, of the screw 26 penetrates through the blocking plate 21 and is rotatably connected with the side wall of the baffle plate 18, and the screw 26 is in threaded transmission connection with the blocking plate 21;
guide bar 27, guide bar 27 one end with baffle 18 is kept away from heating panel 4 a lateral wall fixed connection, the guide bar 27 other end run through closure plate 21 and with micro motor 25 upper end fixed connection, guide bar 27 with closure plate 21 run through position sliding connection.
The working principle and the beneficial effects of the technical scheme are as follows: when the backlight body is not used, the first inclined surface of the first stopper 20 contacts with the second inclined surface of the second stopper 23, so that the first through hole 19 cannot be communicated with the second through hole 22, the air outside the heat dissipation plate 4 cannot enter the cavity 5 from the heat dissipation hole 14, and the moisture and dust outside the heat dissipation plate 4 are prevented from entering the cavity 5 from the heat dissipation hole 14, so as to achieve the purposes of moisture protection and dust prevention, when the backlight body is used, the LED lamp 2 is turned on, the micro motor 25 is started, the micro motor 25 rotates to drive the screw 26 to rotate, the screw 26 rotates to drive the plugging plate 21 to slide in the fixing tube 17 along the axial direction of the guide rod 27 away from the baffle 18 until the first stopper 20 is separated from the second stopper 23, and a gap exists between the first stopper 20 and the second stopper 23 to form an air circulation channel, so that the first through hole 19 is communicated with the second through hole 22, and the heat dissipation fan 16 is not started, the hot air in the cavity 5 enters the fixed pipe 17 through the heat dissipation holes 14, then flows into the space between the blocking plate 21 and the baffle 18 from the first through hole 19, finally flows out of the fixed pipe 17 from the second through hole 22 and the flow passage 24, the flowing air can clean the inside of the fixed plate, and blows out the dust accumulated in the second through hole 22 and the flow passage 24 to the outside of the fixed pipe 17, on one hand, the purpose of heat dissipation is achieved, on the other hand, the dust accumulation can be avoided, the blocking of the second through hole 22 and the flow passage 24 is prevented, after the heat dissipation fan 16 is started, the air outside the heat dissipation plate 4 flows into the space between the baffle 18 and the blocking plate 21 through the second through hole 22, then flows into the heat dissipation holes 14 from the first through hole 19, and finally flows into the cavity 5 from the heat dissipation holes 14, the air in the cavity 5 flows by utilizing the air outside, the heat dissipation is accelerated, when the air enters the fixed pipe 17, the first through hole 19 is higher than the second through hole 22, the height of the first block 20 is higher than that of the second block 23, because the first block 20 is provided with a first inclined surface, the second block 23 is provided with a second inclined surface, dust and moisture in the air can contact with the first inclined surface and the second inclined surface when passing through the first inclined surface and the second inclined surface, the first block 20 and the second block 23 can block the dust and the moisture in the air, the blocked dust and the moisture fall into the bottom between the block 18 and the blocking plate 21 under the action of gravity and flow out of the fixed tube 17 from the flow channel 24, through the arrangement of the moisture-proof assembly, when the backlight body is not used, the moisture-proof assembly can block the heat dissipation holes 14 to prevent external air from entering the cavity 5 from the heat dissipation holes 14, so as to achieve the moisture-proof and dust-proof purposes, when the backlight body is used, if the heat dissipation fan 16 is not started, the heat in the cavity 5 can flow into the fixed tube 17 from the heat dissipation holes 14 and flow out from the flow channel 24 and the second through hole 22, realize thermal giving off, if heat dissipation fan 16 starts, outside air can follow in second through-hole 22 gets into fixed pipe 17, and flow into louvre 14 from first through-hole 19, flow into in cavity 5 at last, the inside air circulation of cavity 5 flows with higher speed, the radiating efficiency is improved, for LED lamp 2 dispels the heat fast, flow into the inside in-process of cavity 5 from the outside at the air, first dog 20 and second dog 23 can play the effect of blockking to the air, make partial moisture and the dust in the air fall between closure plate 21 and baffle 18, discharge from runner 24 at last, further realized dampproofing dustproof to cavity 5 inside, the life of LED lamp 2 has been prolonged.
Example 6
On the basis of embodiment 4, as shown in fig. 6, the bottom wall of the heat dissipation plate 4 is further provided with two air inlets 28, two air inlets 28 are arranged on the bottom wall of the heat dissipation plate 4, the two air inlets 28 are bilaterally symmetrical with respect to the heat dissipation fan 16, and a heat dissipation assembly is arranged below the heat dissipation plate 4, and the heat dissipation assembly includes:
one end of the rotating shaft 29 is fixedly connected with the center position of the output shaft of the heat dissipation fan 16, one end of the rotating shaft 29, which is far away from the heat dissipation fan 16, is provided with a cam 30, and the cam 30 is fixedly connected with the rotating shaft 29;
the two boxes 31 are symmetrically arranged on the left side and the right side of the heat dissipation fan 16, the upper surface of each box 31 is fixedly connected with the bottom wall of the heat dissipation plate 4, an air outlet 32 is arranged on one side, close to the heat dissipation plate 4, of each box 31, the air outlet 32 is communicated with the air inlet 28, a first one-way valve is arranged in each air outlet 32, an air inlet 33 is arranged on one side, far away from the heat dissipation fan 16, of each box 31, one end of each air inlet 33 is communicated with the inside of each box 31, the other end of each air inlet 33 is communicated with the outside of each box 31, and a second one-way valve is arranged in each air inlet 33;
the piston plate 34 is arranged in the box body 31 in a sliding mode, and the piston plate 34 slides left and right along the inner wall of the box body 31;
the piston rod 35 is arranged on one side, close to the heat dissipation fan 16, of the piston plate 34, one end of the piston rod 35 is fixedly connected with the side wall of the piston plate 34, the other end of the piston rod 35 penetrates through one side, close to the cam 30, of the box body 31, extends to the outside of the box body 31 and is provided with a push plate 36, the push plate 36 is fixedly connected with the piston rod 35, and the outer wall of the cam 30 is in intermittent contact with one side, close to the cam 30, of the push plate 36;
the spring 37, the spring 37 cover is established on the piston rod 35, spring 37 one end with the outer wall fixed connection of box 31, the spring 37 other end with push pedal 36 lateral wall fixed connection.
The working principle and the beneficial effects of the technical scheme are as follows: the air outlet 32 is provided with a first one-way valve to make air only flow into the air inlet 28 from the box 31, the air inlet 33 is provided with a second one-way valve to ensure that the air at the air inlet 33 only flows into the box 31 from the outside of the box 31, when the heat dissipation assembly is used, the heat dissipation fan 16 is started, the heat dissipation fan 16 rotates to drive the rotating shaft 29 to rotate, the rotating shaft 29 rotates to drive the cam 30 to rotate, the cam 30 is respectively contacted with the push plates 36 at the left and right sides, when the cam 30 is contacted with the push plates 36, the cam 30 drives the push plates 36 to move towards the direction close to the box 31, the push plates 36 drive the piston plates 34 to slide towards the direction far away from the heat dissipation fan 16 in the box 31 through the piston rods 35, the piston plates 34 press the air in the box 31 into the air inlet 28 from the air outlet 32, then flow into the cavity 5 from the air inlet 28, then the protruding end of the cam 30 rotates towards the direction far away from the box 31, under the action of the spring 37, the push plate 36 moves in the direction away from the box body 31, the piston plate 34 is put down and slides close to the heat dissipation fan 16, outside air flows into the box body 31 from the air suction port 33, the piston plate 34 reciprocates left and right in the box body 31 along with the rotation of the cam 30, and therefore the actions are repeated, the outside air is enabled to intermittently flow into the cavity 5 from the air inlets 28 on the two sides, heat exchange is achieved, the outside air is finally discharged from the heat dissipation fan 16, the air circulation flow in the cavity 5 is accelerated, the heat convection efficiency is improved, and the effect of rapid heat dissipation is achieved.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A light guide plate-free bottom-emission backlight source, comprising: the backlight source body, the backlight source body includes flexible circuit board (1), flexible circuit board (1) upper surface sets up a plurality of LED lamps (2), LED lamp (2) outside cover is equipped with spotlight subassembly, form spotlight chamber (3) in the spotlight subassembly, flexible circuit board (1) lower surface sets up heating panel (4), set up cavity (5) in heating panel (4), cavity (5) through connecting pipe (6) with spotlight chamber (3) intercommunication.
2. The plate-free bottom-emission backlight source of claim 1, wherein a diffusion plate (7) is disposed above the LED lamps (2), a lower diffusion sheet (8) is disposed on the upper surface of the diffusion plate (7), a brightness enhancement sheet (9) is disposed on the upper surface of the lower diffusion sheet (8), and an upper diffusion sheet (10) is disposed on the upper surface of the brightness enhancement sheet (9).
3. The light guide plate-free bottom-emission backlight source as claimed in claim 2, wherein a fixing frame (11) is further disposed on the upper surface of the flexible circuit board (1), the LED lamp (2), the light condensing assembly, the diffusion plate (7), the lower diffusion sheet (8), the brightness enhancement sheet (9), and the upper diffusion sheet (10) are disposed in the fixing frame (11), and the upper surface of the upper diffusion sheet (10) is fixedly connected to the upper end of the fixing frame (11) through a light-shielding adhesive (12).
4. The light-guide-plate-free bottom-emission backlight source as claimed in claim 1, wherein the LED lamps (2) are fixedly mounted on the upper surface of the flexible circuit board (1) in an array distribution manner.
5. The light guide plate-free bottom-emission backlight source of claim 2, wherein the light condensing assembly is formed by splicing four isosceles trapezoid plates (13), the waist edges of the four isosceles trapezoid plates (13) are sequentially connected, the isosceles trapezoid plates (13) are obliquely arranged, a first bottom edge is arranged on one side, close to the flexible circuit board (1), of each isosceles trapezoid plate (13), a second bottom edge is arranged on one side, far away from the flexible circuit board (1), of each isosceles trapezoid plate (13), the length of the first bottom edge is smaller than that of the second bottom edge, the first bottom edges of the four isosceles trapezoid plates (13) are fixedly connected with the upper surface of the flexible circuit board (1), and the second bottom edge is fixedly connected with the lower surface of the diffusion plate (7).
6. The backlight source of claim 5, wherein the included angle between the isosceles trapezoid (13) and the flexible circuit board (1) is an acute angle, and the size of the included angle between the isosceles trapezoid (13) and the flexible circuit board (1) should satisfy the following formula:
Figure FDA0003406745010000021
wherein, theta0The included angle between the isosceles trapezoid-shaped plate (13) and the flexible circuit board (1) is set, arctan is an arctangent function, S is a preset horizontal distance between the center positions of two adjacent LED lamps (2), X is a first preset length of the isosceles trapezoid-shaped plate (13) close to a first bottom edge of the flexible circuit board (1), and H is a vertical distance from the upper surface of the flexible circuit board (1) to the upper surface of the backlight body.
7. The light guide plate-free bottom-emission backlight of claim 6, wherein the actual length of the second bottom edge satisfies the following formula:
Figure FDA0003406745010000022
y is the actual length of the second bottom edge, X is the first preset length of the isosceles trapezoid plate (13) close to the first bottom edge of the flexible circuit board (1), H is the vertical distance from the upper surface of the flexible circuit board (1) to the upper surface of the backlight body, S is the preset horizontal distance between the center positions of two adjacent LED lamps (2), and H is the vertical distance from the second bottom edge to the upper surface of the flexible circuit board (1).
8. The backlight source of claim 1, wherein heat dissipation holes (14) are symmetrically disposed in the left and right sidewalls of the heat dissipation plate (4), one end of each heat dissipation hole (14) is communicated with the corresponding cavity (5), the other end of each heat dissipation hole (14) is communicated with the outside of the heat dissipation plate (4), a mounting hole (15) is disposed at the center of the bottom of the heat dissipation plate (4), the mounting hole (15) penetrates through the bottom wall of the heat dissipation plate (4), the cavity (5) is communicated with the outside of the heat dissipation plate (4) through the mounting hole (15), and a heat dissipation fan (16) is disposed in the mounting hole (15).
9. The light guide plate-free bottom-emission backlight source according to claim 8, wherein the outer walls of the left and right sides of the heat dissipation plate (4) are symmetrically provided with moisture-proof components, and the moisture-proof components comprise:
the left end and the right end of the fixing pipe (17) are provided with openings, and one end, close to the heat dissipation plate (4), of the fixing pipe (17) is fixedly connected with the side wall of the heat dissipation plate (4);
the baffle (18), the said baffle (18) is set up in the said fixed pipe (17), the said baffle (18) periphery and said fixed pipe (17) inner wall fixed connection, the said baffle (18) is set up in the said fixed pipe (17) and close to one end of the said heating panel (4);
the first through hole (19) is formed in the baffle (18), the first through hole (19) penetrates through the left side wall and the right side wall of the baffle (18), and the first through hole (19) is communicated with the heat dissipation hole (14);
the first stop block (20) is arranged on one side, far away from the heat dissipation plate (4), of the baffle plate (18), the first stop block (20) is in a right-angled trapezoid shape, one side of a right-angled edge of the first stop block (20) is fixedly connected with the side wall of the baffle plate (18), one side, far away from the baffle plate (18), of the first stop block (20) is provided with a first inclined surface, the length of the upper end of the first stop block (20) is smaller than that of the lower end of the first stop block (20), the height of the upper end of the first stop block (20) is lower than that of the upper end of the first through hole (19), the height of the upper end of the first stop block (20) is higher than that of the lower end of the first through hole (19), and the height of the lower end of the first stop block (20) is lower than that of the first through hole (19);
the blocking plate (21) is arranged in the fixed pipe (17), the blocking plate (21) is positioned on one side, away from the heat dissipation plate (4), of the baffle plate (18), and the periphery of the blocking plate (21) is in sliding connection with the inner wall of the fixed pipe (17);
the second through hole (22), the second through hole (22) is arranged in the plugging plate (21), the second through hole (22) penetrates through the left side wall and the right side wall of the plugging plate (21), one end of the second through hole (22) is communicated with the outside of the fixed pipe (17), the other end of the second through hole (22) is communicated with the inside of the fixed pipe (17), and the height of the second through hole (22) is lower than that of the first through hole (19);
the second stop block (23) is arranged on one side, close to the heat dissipation plate (4), of the blocking plate (21), the second stop block (18) is in a right-angle trapezoid shape, one side of a right-angle edge of the second stop block (23) is fixedly connected with the side wall of the blocking plate (21), a second inclined surface is arranged on one side, far away from the blocking plate (21), of the second stop block (23), the length of the upper end of the second stop block (23) is larger than that of the lower end of the second stop block (23), the first inclined surface is matched with the second inclined surface, the height of the upper end of the second stop block (23) is higher than that of the upper end of the second through hole (22), the height of the lower end of the second stop block (23) is higher than that of the lower end of the second through hole (22), and the height of the lower end of the second stop block (23) is lower than that of the upper end of the second through hole (22);
the flow channel (24) is arranged on the bottom wall of the fixed pipe (17), the outlet end of the flow channel (24) is communicated with the outside of the fixed pipe (17), the inlet end of the flow channel (24) is communicated with the inside of the fixed pipe (17), and the inlet end of the flow channel (24) is positioned between the plugging plate (21) and the baffle plate (18);
the micro motor (25) is arranged in the fixed pipe (17), the micro motor (25) is located on one side, away from the heat dissipation plate (4), of the blocking plate (21), the bottom wall of the micro motor (25) is fixedly connected with the inner wall of the fixed pipe (17), the output end of the micro motor (25) is provided with a screw rod (26), one end, away from the micro motor (25), of the screw rod (26) penetrates through the blocking plate (21) and is rotatably connected with the side wall of the baffle plate (18), and the screw rod (26) is in threaded transmission connection with the blocking plate (21);
guide bar (27), guide bar (27) one end with baffle (18) are kept away from heating panel (4) a lateral wall fixed connection, guide bar (27) other end runs through closure plate (21) and with micro motor (25) upper end fixed connection, guide bar (27) with closure plate (21) run through position sliding connection.
10. The light guide plate-free bottom-emission backlight source according to claim 8, wherein the bottom wall of the heat dissipation plate (4) is further provided with two air inlets (28), two air inlets (28) are bilaterally symmetric with respect to the heat dissipation fan (16), and a heat dissipation assembly is disposed below the heat dissipation plate (4), the heat dissipation assembly comprising:
one end of the rotating shaft (29) is fixedly connected with the center of an output shaft of the heat dissipation fan (16), one end, far away from the heat dissipation fan (16), of the rotating shaft (29) is provided with a cam (30), and the cam (30) is fixedly connected with the rotating shaft (29);
the two boxes (31) are symmetrically arranged on the left side and the right side of the heat dissipation fan (16), the upper surface of each box (31) is fixedly connected with the bottom wall of the heat dissipation plate (4), an air outlet (32) is formed in one side, close to the heat dissipation plate (4), of each box (31), the air outlet (32) is communicated with the air inlet (28), a first one-way valve is arranged in the air outlet (32), an air suction port (33) is formed in one side, far away from the heat dissipation fan (16), of each box (31), one end of each air suction port (33) is communicated with the inside of each box (31), the other end of each air suction port (33) is communicated with the outside of each box (31), and a second one-way valve is arranged in each air suction port (33);
the piston plate (34) is arranged in the box body (31) in a sliding mode, and the piston plate (34) slides left and right along the inner wall of the box body (31);
the piston rod (35) is arranged on one side, close to the heat dissipation fan (16), of the piston plate (34), one end of the piston rod (35) is fixedly connected with the side wall of the piston plate (34), the other end of the piston rod (35) penetrates through one side, close to the cam (30), of the box body (31), extends to the outer portion of the box body (31) and is provided with a push plate (36), the push plate (36) is fixedly connected with the piston rod (35), and the outer wall of the cam (30) is in intermittent contact with one side, close to the cam (30), of the push plate (36);
spring (37), spring (37) cover is established on piston rod (35), spring (37) one end with box (31) outer wall fixed connection, spring (37) the other end with push pedal (36) lateral wall fixed connection.
CN202111515389.XA 2021-12-13 2021-12-13 Bottom light-emitting backlight without light guide plate Pending CN114200716A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115202103A (en) * 2022-07-08 2022-10-18 苏州华星光电技术有限公司 Backlight module and liquid crystal display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115202103A (en) * 2022-07-08 2022-10-18 苏州华星光电技术有限公司 Backlight module and liquid crystal display device

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