Backlight plate

Abstract

The technical scheme belongs to the technical field of backlight plates, and particularly relates to a backlight plate which comprises a plate seat, a lamp bead and a light guide plate, the lamp bead comprises a carrier part and a pin part, the pin part comprises an anode pin and a cathode pin, one side plate surface of the plate seat is provided with a mounting groove for embedding the light guide plate, the plate seat is provided with a fixed mounting part, and the fixed mounting part is provided with a fixed mounting groove. A wire passing groove is formed in the edge of the plate shell, and extends and sinks from the edge of the plate base to the groove bottom of the mounting groove; the carrier part is in a three-dimensional shape which gradually changes along the axial direction, the outer diameter of the front end of the carrier part is smaller than that of the rear end, the pin part is arranged at the rear end of the carrier part, the pin part is adaptively mounted in the fixed mounting groove through the wire passing groove and the carrier part, and self-positioning of a contact surface is realized and mounting deviation is reduced by utilizing geometric constraint of a structure that the outer diameter of the front end is smaller than that of the rear end; the lamp beads are further calibrated in the inserting stage, the micro displacement under the vibration working condition is reduced, the positions of the assembled lamp beads are the same, the brightness of the backlight plate is kept uniform, and the production quality of the backlight plate is improved.

Description

Technical Field

[0001] This technical solution relates to the field of backlight panel technology, and specifically refers to a backlight panel. Background Technology

[0002] The backlight panel is the core light-emitting component of a liquid crystal display (LCD), while the LED beads are the core light-emitting elements of the backlight module. They typically use LED (light-emitting diode) technology, which generates high-brightness white light through the principle of electroluminescence. Together with the light guide plate, they achieve uniform illumination of the screen and are widely used in devices such as televisions and displays, directly affecting screen brightness, color reproduction, and energy consumption.

[0003] For example, Chinese patent CN205750215U discloses a backlight panel. The small backlight panel can form a mounting groove for the entire base through a side plate, a first folding plate, a second folding plate, and a third folding plate. The second folding plate is connected to a card plate. The card plate has a first protrusion and a second protrusion on both sides. The light guide plate has an L-shaped card slot, which can be engaged with the protrusions on both sides of the front and connected to the base. The light-emitting diode is connected to the light guide plate through the connecting groove on the second folding plate.

[0004] In the aforementioned technology, the leads of square / rectangular LED beads need to be manually passed through the through holes in the base to install the LED beads inside the base. Then, the cover is closed and pressed to complete the assembly. However, after the LED beads are installed in the base, they will move left and right. As a result, after the cover is closed, the position of the LED beads is not unique, which leads to different positions of the LED beads in the assembled backlight panel. This can cause problems such as uneven brightness of the backlight panel, affecting the overall quality of the backlight panel. Summary of the Invention

[0005] This technical solution addresses the problem of inconsistent LED positions and uneven backlight brightness caused by the left-right movement of LEDs within the base, resulting in poor backlight quality.

[0006] The purpose of this technical solution is achieved as follows:

[0007] A backlight panel includes a base, LED chips, and a light guide plate. The LED chips include a carrier portion and a pin portion. The pin portion includes a positive terminal and a negative terminal. One side of the base has a mounting groove for mounting the light guide plate. The base has a mounting portion with a mounting groove. The edge of the base has a wire-passing groove that extends and recesses from the edge of the base toward the bottom of the mounting groove.

[0008] The carrier portion has a three-dimensional shape that gradually changes along the axial direction. The outer diameter of the front end of the carrier portion is smaller than the outer diameter of the rear end. The pin portion is located at the rear end of the carrier portion. The pin portion passes through the wire guide groove, and the carrier portion is adapted to be installed in the mounting groove.

[0009] By the technical scheme, when the backlight plate is normally used, the lamp bead is inserted into the positioning groove of the positioning part from the upper side of the installation groove of the one side of the plate seat during assembly, so as to limit the swing of the lamp bead in the groove, the pin part is correspondingly led out of the plate seat through the wire groove for power supply, the irregular three-dimensional structure of the carrier part is arranged by concentrating the pin part at the larger end, the profile of the carrier part is adapted to the positioning groove and forms a wedge-shaped interlocking, the geometric constraint of the structure that the outer diameter of the front end is smaller than the outer diameter of the rear end is used to realize the self-positioning feature of the contact surface to reduce the installation deviation, the stress buffer zone is constructed by the stepped size difference, the physical calibration of the lamp bead is completed during the insertion stage, the micro-displacement amount under the vibration working condition is reduced, the positions of the lamp beads are the same after assembly, the brightness of the backlight plate is kept uniform, and the production quality of the backlight plate is improved.

[0010] Preferably, the cross-sectional shape of the carrier part is polygonal, trapezoidal, elliptical, or drop-shaped.

[0011] By the technical scheme, the polygonal, trapezoidal, elliptical, or drop-shaped cross-sectional carrier part is preferably adopted, different shapes are limited, and better applicability is achieved.

[0012] Preferably, the outer wall of the carrier part has a guide arc surface.

[0013] By the technical scheme, the guide arc surface guides the embedding of the carrier part, the accuracy and convenience of lamp bead installation are improved.

[0014] Preferably, one side of the plate seat has an installation groove, the light guide plate is embedded in the installation groove, the plate seat is provided with a positioning part, the positioning part is provided with the positioning groove, the limiting part is arranged on the opposite side wall of the through opening, and the distance between the limiting parts on the two sides is smaller than the width of the second end of the carrier part.

[0015] By the technical scheme, the limiting parts on the two sides are in interference fit with the carrier part by protruding backward to form a resistance constraint, the stability of lamp bead installation is better, the risk of deviation is reduced, the requirement for assembly precision is reduced, the assembly difficulty is reduced, and therefore the mechanical assembly is more suitable, the embedding of the lamp bead is realized during the pushing assembly process of the automatic equipment, the effect of fixed positioning is achieved, and the adaptability to production automation is improved.

[0016] Preferably, the bottom of the installation groove is further provided with a limiting groove, the limiting groove is provided with the positioning part on the opposite sides of the groove edge, the groove wall of the limiting groove has a relief surface, and the inclination direction of the relief surface is inclined downward toward the groove bottom of the limiting groove.

[0017] By the technical scheme, the bottom of the front end contacts the relief surface during the assembly of the lamp bead, the side edge of the bottom of the installation groove is avoided from being resisted, the non-contact design reduces the abrasion amount of the bottom of the lamp bead, the bottom of the lamp bead is further embedded in the limiting groove during the assembly of the lamp bead, the embedding depth in the vertical direction is improved, and the stability of assembly is further improved.

[0018] Preferably, the relative inner side wall of the installation groove is an inclined side wall, and the inclined direction of the inclined side wall is such that the groove width of the installation groove is arranged to be tapered towards the direction away from the wire passing groove.

[0019] Through the above technical solution, the inclined side wall generates a radial convergence force through the tapered groove width, limiting the movement of the lamp bead away from the wire passing groove, and the tapered structure further realizes self-locking positioning of the lamp bead, further improving the assembly stability.

[0020] Preferably, the installation part has a guide surface, which is arranged on the opposite sides of the installation part inside the installation groove along the mounting direction of the lamp bead, so that the upper end groove edge of the installation groove is arranged to be flared towards the direction away from the limiting groove.

[0021] Through the above technical solution, when the lamp bead is assembled by pressing down, the flared structure of the guide surface forms an initial guide channel of the installation groove, and the two sides of the inclined surface automatically converge the lamp bead to displace downward, so that it slides into the installation groove along the flared central axis, and at the same time, the vertical angle is corrected synchronously with the avoiding surface of the bottom limiting groove, further improving the positioning accuracy of automatic assembly, and further improving the assembly yield.

[0022] Preferably, the relative side wall in the mounting groove protrudes a clamping part, and the cover is clamped between the two clamping parts, so that the cover is embedded in the mounting groove for positioning.

[0023] Through the above technical solution, the width of the cover is smaller than the distance between the two clamping parts protruding from the relative side walls of the mounting groove, so that the cover is squeezed through the two clamping parts, and the clamping parts form a symmetrical surface contact pressing force on both sides, improving the accuracy of the installation and positioning of the cover.

[0024] Preferably, the cover is provided with a placement groove corresponding to the position of the installation groove, and the placement groove and the installation groove are combined to form a cavity for limiting the positioning of the lamp bead.

[0025] Through the above technical solution, the placement groove and the installation groove of the plate seat are precisely combined to form a cavity, and the lamp bead is completely wrapped in the cavity for constraint positioning, and the light axis of the lamp bead can be aligned with the side wall of the placement groove for convenient light transmission.

[0026] Preferably, a solder part is further arranged between the plate seat and the cover, which is distributed around the installation part for ultrasonic welding and melting to bond the plate seat and the light guide plate.

[0027] The plate seat and the cover further protrude a surplus protrusion.

[0028] By the technical scheme, the solder part between the plate base and the plate cover is melted by ultrasonic welding during welding, so that the plate base and the plate cover are fixedly installed; the excess protrusion forms a heat conduction buffer structure through local contact, the heat generated by welding of the solder part is dispersed and conducted along the protrusion, the heat aggregation in the main body area of the plate base is reduced, the close adhesion of the plate base and the plate cover due to heat is avoided, and the light transmittance is ensured.

[0029] The technical scheme has the following prominent and beneficial technical effects compared with the prior art:

[0030] 1、The technical scheme adopts an irregular three-dimensional shape for the shape of the lamp bead, the outer diameter of the front end of the carrier part is smaller than the outer diameter of the rear end, the profile is adapted to the fixing groove to form a wedge-shaped interlocking, self-positioning and calibration are achieved through the geometric constraint of the special-shaped structure, the positions of the lamp beads are the same after assembly, the brightness of the backlight plate remains uniform, and the production quality of the backlight plate is improved. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the embodiment;

[0032] Figure 2 It is a schematic diagram of the local explosion of the embodiment;

[0033] Figure 3 It is a schematic diagram of the local explosion of the embodiment; Figure 2

[0034] Figure 4 It is a schematic diagram of the overall structure of the lamp bead in the embodiment;

[0035] Figure 5 It is a schematic diagram of the overall structure of the plate cover in the embodiment.

[0036] Reference signs: 1, lamp bead; 101, carrier part; 102, pin part; 21, positive pin; 22, negative pin; 3, guide arc surface; 4, plate base; 5, plate cover; 6, mounting groove; 7, wire passing groove; 8, fixing part; 9, fixing groove; 10, limiting part; 11, limiting groove; 12, avoiding surface; 13, inclined side wall; 14, guide surface; 15, clamping part; 16, mounting groove; 17, solder part; 18, excess protrusion. DETAILED DESCRIPTION

[0037] The specific embodiments of the technical scheme will be further described in detail below with reference to the drawings.

[0038] Embodiment:

[0039] Reference is made to Figure 1 and Figure 4 ​A backlight panel comprises a panel base 4, a lamp bead 1 and a panel cover 5. The lamp bead 1 comprises a carrier part 101 and a pin part 102. The outer diameter of the front end of the carrier part 101 is smaller than that of the rear end. The pin part 102 comprises a positive pin 21 for connecting with the positive pole of a power supply and a negative pin 22 for connecting with the negative pole of the power supply. The carrier part 101 is wrapped outside one end of the pin part 102 by glue pouring. The pin part 102 extends outward from the rear end of the carrier part 101. The shape of the carrier part 101 is a solid shape gradually changing along the axial direction. The cross-sectional shape of the carrier part 101 along the same plane as the positive pin 21 and the negative pin 22 is a trapezoid, an isosceles trapezoid, a convex shape or a special shape. The special shape can be a wave shape, a water drop shape or other polygonal shape. In the embodiment, the isosceles trapezoid is preferred. The carrier part 101 has a guide arc surface 3 arranged as the edge between the front end and the rear end of the carrier part 101. The guide arc surface 3 is provided with four guide arc surfaces.

[0040] Referring to Figure 2 and Figure 3 , one side of the panel base 4 is recessed in the thickness direction to form a mounting groove 6. The opposite side walls in the mounting groove 6 are protruded to form clamping parts 15. The panel cover 5 is clamped between the clamping parts 15 on both sides so as to be fixed and positioned in the mounting groove 6. The front end of the mounting groove 6 can mount the carrier part 101. The bottom of the mounting groove 6 is further provided with a limiting groove 11 located at the front end of the mounting groove 6 and communicating with a wire passing groove 7. The groove wall of the limiting groove 11 has a relief surface 12 located on the side of the limiting groove 11 away from the wire passing groove 7. The relief surface 12 is arranged as an inclined surface and inclined downward in the direction of the groove bottom of the limiting groove 11.

[0041] The panel base 4 is provided with a positioning part 8 arranged on both sides of the groove opening edge of the limiting groove 11 and opposite to each other. The height of the positioning part 8 protruding relative to the bottom of the mounting groove 6 is α, α = 0.8mm-1.6mm, preferably α = 1mm. The inner side of the positioning part 8 has a positioning groove 9 matched with the shape of the carrier part 101. The positioning groove 9 is provided with the wire passing groove 7 on the front side wall of the side wall of the panel base 4 for the pin part 102 to pass through. The other side of the positioning groove 9 opposite to the wire passing groove 7 is provided with a light transmission opening. The positioning part 8 has inclined side walls 13 arranged on the opposite inner side walls of the positioning groove 9. The inclined directions of the inclined side walls 13 on both sides are such that the groove width of the positioning groove 9 is arranged as a necking in the direction away from the wire passing groove 7, so that the positioning groove 9 has a contour matched with the carrier part 101. The end of the positioning groove 9 with wider groove width is connected at the wire passing groove 7.

[0042] The positioning part 8 further has guide surfaces 14 arranged on the opposite sides of the positioning part 8 in the mounting direction of the lamp bead inside the positioning groove 9. The guide surfaces 14 on both sides are opposite to each other so that the upper end groove opening edge of the positioning groove 9 is arranged as an expanding in the direction away from the limiting groove 11 to cooperate with the guide of the carrier part 101 through the opening at the upper end of the positioning groove 9.

[0043] The limiting portion 10 is arranged on the opposite side wall of the slot position of the wire passing slot 7, the inner wall distance of the limiting portion 10 on both sides is less than the width of the rear end of the carrier portion 101, so that the carrier portion 101 is embedded and forms an interference fit with the limiting portion 10 after embedding, thereby limiting the carrier portion 101 from being separated from the fixed mounting slot 9 through the wire passing slot 7.

[0044] The solder portion 17 is further arranged between the plate base 4 and the plate cover 5, is arranged at the bottom of the mounting slot 6 and is distributed on the circumferential side of the fixed mounting portion 8, is used as the molten material of ultrasonic welding, is fused and is used for bonding the plate base 4 and the plate cover 5, and the excess protrusions 18 are further protruded between the plate base 4 and the plate cover 5, two excess protrusions 18 are arranged, and the two excess protrusions 18 are all protruded at the bottom of the mounting slot 6.

[0045] Referring to Figure 5 The plate cover 5 is provided with the arrangement slot 16 corresponding to the position of the fixed mounting slot 9, the arrangement slot 16 is provided with an opening corresponding to the side wall of the plate cover 5, the opening position is also opposite to the wire passing slot 7, the plate cover 5 is embedded in the mounting slot 6, the plate cover 5 is pressed against the plate base 4, the arrangement slot 16 is combined with the fixed mounting slot 9 to form a cavity for limiting the positioning of the carrier portion 101.

[0046] The specific working process of the scheme is as follows:

[0047] The carrier portion 101 is embedded in the fixed mounting slot 9 through the guide surface 14, and the lower end is embedded in the limiting slot 11, the tapered profile of the carrier portion 101 forms a wedge-shaped interlocking with the trapezoidal fixed mounting slot 9 of the backlight plate, the inclined side walls 13 on both sides limit the movement of the carrier portion 101 to the inside of the mounting slot 6, the pin portion 102 is correspondingly inserted through the wire passing slot 7, the interference fit of the limiting portion 10 on both sides and the carrier portion 101 forms a resistance constraint, thereby limiting the carrier portion 101 from passing through the wire passing slot 7, the step size difference between the first end (the light emitting end) and the second end is used to make the geometric constraint of the special-shaped structure realize the self-positioning characteristics of the contact surface, reduce the installation deviation, construct a stress buffer zone, complete the physical calibration of the lamp bead in the plug-in stage, reduce the micro-displacement amount under the vibration working condition, the positions of the lamp beads are the same after assembly, the brightness of the backlight plate remains uniform, and the production quality of the backlight plate is improved.

[0048] The basic principle and main features of the technical scheme and the advantages of the technical scheme are shown and described above. It should be understood by those skilled in the art that the technical scheme is not limited by the above examples, the above examples and the description in the specification are only to illustrate the principle of the technical scheme, and various changes and improvements can be made to the technical scheme without departing from the spirit and scope of the technical scheme, and these changes and improvements all fall within the scope of the claimed technical scheme. The scope of protection of the technical scheme is defined by the appended claims and their equivalents.

Claims

1. A backlight panel comprising a panel base (4), a lamp bead (1) and a light guide plate (5), the lamp bead (1) comprising a carrier part (101) and a pin part (102), the pin part (102) comprising a positive pin (21) and a negative pin (22), one side surface of the panel base (4) having a mounting groove (6) for embedding the light guide plate (5), characterized in that: The plate base (4) is provided with a fixed mounting portion (8) having a fixed mounting groove (9), and the edge of the plate base (4) is provided with a wire passing groove (7) extending and recessing from the edge of the plate base (4) to the bottom of the mounting groove (6); The carrier portion (101) is in a solid shape gradually changing in the axial direction, the outer diameter of the front end of the carrier portion (101) is smaller than that of the rear end, the pin portion (102) is arranged at the rear end of the carrier portion (101), the pin portion (102) passes through the wire passing groove (7), and the carrier portion (101) is adapted to be mounted in the fixed mounting groove (9).

2. The backlight of claim 1, wherein: The cross-sectional shape of the carrier portion (101) is trapezoidal or convex or special-shaped.

3. The backlight of claim 1, wherein: The edge between the front end and the rear end of the carrier portion (101) is provided as a guide arc surface (3).

4. The backlight of claim 1, wherein: The opposite side walls of the wire passing groove (7) at the groove opening position are each provided with a limiting portion (10), and the spacing between the limiting portions (10) on the two sides is smaller than the width of the rear end of the carrier portion (101).

5. The backlight of claim 4, wherein: The bottom of the mounting groove (6) is further provided with a limiting groove (11), the left and right sides of the groove opening edge of the limiting groove (11) are each provided with the fixed mounting portion (8), the groove wall of the limiting groove (11) has an avoiding surface (12) inclined downward toward the bottom of the limiting groove (11).

6. The backlight of claim 4, wherein: The opposite inner walls of the fixed mounting groove (9) are inclined side walls (13) inclined in a direction away from the wire passing groove (7).

7. The backlight of claim 5, wherein: The fixed mounting portion (8) has a guide surface (14) arranged on the opposite sides of the fixed mounting portion (8) in the fixed mounting groove (9) in the direction of mounting the lamp bead, so that the upper end groove opening edge of the fixed mounting groove (9) is expanded in a direction away from the limiting groove (11).

8. The backlight of claim 4, wherein: The opposite side walls in the mounting groove (6) are protruded with clamping portions (15), the light guide plate (5) is clamped between the clamping portions (15) on the two sides, so that the light guide plate (5) is embedded and positioned in the mounting groove (6).

9. The backlight of claim 4, wherein: The light guide plate (5) is provided with a placement groove (16) corresponding to the position of the fixed mounting groove (9), and the placement groove (16) and the fixed mounting groove (9) are combined to form a cavity for limiting the positioning of the carrier portion (101).

10. The backlight of claim 4, wherein: The plate base (4) and the light guide plate (5) are further provided with a solder portion (17) distributed around the fixed mounting portion (8) for ultrasonic welding and melting to bond the plate base (4) and the light guide plate (5). The plate base (4) and the light guide plate (5) are further protruded with a surplus protrusion (18).

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