CN214619094U

CN214619094U - Self-supporting shadowless LED filament and LED lamp

Info

Publication number: CN214619094U
Application number: CN202120514818.0U
Authority: CN
Inventors: 任菊辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-09
Filing date: 2021-03-09
Publication date: 2021-11-05
Anticipated expiration: 2031-03-09

Abstract

The utility model relates to a self-supporting shadowless LED filament and LED lamp, wherein, the LED filament is used for assembling the LED lamp, the LED filament comprises a transparent PCB, a plurality of LED chips and fluorescent glue covering the periphery of the PCB and the LED chips; the PCB is provided with a first area and a second area, the width of the first area is larger than that of the second area, the first area is inserted into a lamp cap of the LED lamp and fixedly connected with the lamp cap, and the LED chip is arranged on one side of the second area; the first area and the second area are provided with conductive patterns, and the LED chip is electrically connected with a circuit inside the lamp cap through the conductive patterns. The utility model discloses a LED lamp, owing to adopt the LED filament of PCB board and support integration, can not cause shadow and facula because support or stem shelter from the luminous body when the LED chip is luminous, improved the display effect of LED lamp.

Description

Self-supporting shadowless LED filament and LED lamp

Technical Field

The utility model relates to a lighting apparatus technical field especially relates to a no support shadowless LED filament and LED lamps and lanterns.

Background

With the improvement of the living standard of human beings, the human beings do not only illuminate the illumination requirements, but slowly pay attention to the illumination experience, so that the individuation, the intellectualization and the situational effect can be important demands of the human beings on the illumination requirements; in order to meet the demand, LED filaments, bulbs and lamps need to have higher quality and more forms exist.

The traditional LED lamp comprises a plurality of filaments, the plurality of filaments need to be supported in a bulb of the lamp by a support, and the support can block part of the filaments from emitting light to form a shadow, so that the final display effect is influenced; meanwhile, in order to realize intellectualization (color and dynamic conversion), the LED filament needs to realize the output of multiple paths of signals, and the current technology has high realization cost and poor effect.

Therefore, it is highly desirable to provide a self-supporting shadow-free LED filament and LED lamp with better display effect.

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved

In view of the above disadvantages and deficiencies of the prior art, the present invention provides a support-free and shadow-free LED filament and LED lamp, which solves the technical problem of shadow formation of the existing lamp due to the support blocking the part of the filament to emit light.

(II) technical scheme

In order to achieve the above object, the utility model discloses a main technical scheme include:

in a first aspect, an embodiment of the present invention provides a self-supporting shadowless LED filament for assembling an LED lamp, wherein the LED filament includes a transparent PCB, a plurality of LED chips, and fluorescent glue covering the periphery of the PCB and the LED chips;

the PCB is provided with a first area and a second area, the width of the first area is larger than that of the second area, the first area is inserted into a lamp cap of the LED lamp and fixedly connected with the lamp cap, and the LED chip is arranged on one side of the second area;

the first area and the second area are provided with conductive patterns, and the LED chip is electrically connected with a circuit inside the lamp cap through the conductive patterns.

Optionally, a first pad and a second pad are disposed on the first region, and the first pad and the second pad have a thickness of 0.1-0.5 mm.

Optionally, a row of LED chips is disposed in the second region, one end of each LED chip is connected to the first bonding pad, and the other end of each LED chip is connected to the second bonding pad.

Optionally, a control circuit is further disposed on the first region, the control circuit stores a control program and has a plurality of control signal terminals; the control circuit can control the LED chips on the transparent PCB in a partitioning manner so as to realize the effect of color and dynamic transformation; the positive pole of the control circuit is connected with the first bonding pad, and the negative pole of the control circuit is connected with the second bonding pad.

Optionally, two rows of LED chips are arranged in the second region, and each LED chip includes a first row of LED chips and a second row of LED chips, one end of each LED chip in the first row and one end of each LED chip in the second row are connected to the first pad, the other end of each LED chip in the first row is connected to the first control signal terminal of the control circuit, and the other end of each LED chip in the second row is connected to the second control signal terminal of the control circuit;

fluorescent glue with different colors is respectively wrapped on the peripheries of the first row of LED chips and the second row of LED chips, or LED single-color chips with different colors are respectively selected for the first row of LED chips and the second row of LED chips, and under the control of the control circuit, double-color conversion and adjustment are realized.

Optionally, the LED chips are divided into a first group of LED chips, a second group of LED chips, a third group of LED chips and a fourth group of LED chips along the length direction of the PCB;

one end of each of the first group of LED chips, the second group of LED chips, the third group of LED chips and the fourth group of LED chips is connected with the first bonding pad, the other end of each of the first group of LED chips is connected with a first control signal end of the control circuit, the other end of each of the second group of LED chips is connected with a second control signal end of the control circuit, the other end of each of the third group of LED chips is connected with a third control signal end of the control circuit, and the other end of each of the fourth group of LED chips is connected with a fourth control signal end of the control circuit;

the four groups of LED chips are LED single-color chips with the same color, the four groups of LED chips are LED single-color chips with different colors respectively, or the peripheries of the four groups of LED chips are wrapped with fluorescent glue with different colors respectively, and color conversion and/or dynamic conversion adjustment are realized under the control of the control circuit.

Optionally, the first pad and the second pad are respectively welded or riveted with a metal terminal.

Optionally, the LED chip is an LED monochrome chip or an RGB chip;

the PCB is a single-layer board or a multi-layer board and is made of PI, glass fiber, BT or PET transparent materials.

In a second aspect, an LED lamp includes any one of the above LED filaments, a lamp cap, and a lamp bulb casing connected to the lamp cap, wherein a driving power supply capable of outputting low-voltage direct current is disposed inside the lamp cap, and the LED filament is inserted into a fixing slot of the driving power supply casing, and is electrically connected to the driving power supply, or is directly electrically connected to an external direct current power supply;

a positioning column is arranged in a fixing clamping groove of the driving power supply protection shell, a positioning hole matched with the positioning column is formed in a first area of the PCB, and the positioning column is inserted into the positioning hole.

(III) advantageous effects

The utility model has the advantages that: the utility model discloses a self-supporting unshaded LED filament, owing to adopt transparent PCB board to support each LED chip, transparent PCB board has certain intensity, can self-supporting, for prior art, it does not need independent support or stem to do the support, simple structure, low cost to when luminous, can not shelter from the luminous body and cause shadow and facula because of support or stem, improved the display effect of LED filament. And because first pad and second pad all set up the one end at the LED filament, rather than both ends, its simple to operate does not have the dark space simultaneously and also can not cause because of the connection problem and be in the light.

The utility model discloses a LED filament, owing to adopt the LED chip that control IC multiple control matrix was arranged, for prior art, its luminous and control circuit integration, simple structure, cost of manufacture are low, can realize dazzling various effect or white light effect or other colour effects, can further realize through control IC that the display effect such as horse race lamp, running water lamp and flame lamp is adjusted.

Drawings

Fig. 1 is a schematic front view of an LED filament according to embodiment 1 of the present invention, in which a metal terminal is not mounted on a bonding pad;

fig. 2 is a schematic front view of an LED filament according to embodiment 1 of the present invention, in which a bonding pad is mounted with a metal terminal;

fig. 3 is a schematic front view of an embodiment 2 of the LED filament according to the present invention;

fig. 4 is a schematic front view of embodiment 3 of the LED filament according to the present invention;

fig. 5 is a schematic view of the internal structure of the lamp of the present invention equipped with the LED filament of embodiment 1;

fig. 6 is a schematic view of the internal structure of the lamp of the present invention equipped with the LED filament of embodiment 2;

fig. 7 is a schematic view of the internal structure of a lamp with the LED filament according to embodiment 3;

fig. 8 is a circuit connection diagram of the control IC and the plurality of groups of LED chips.

[ description of reference ]

1: an LED filament; 2: a drive power supply; 3: a lamp cap; 4: a bulb shell; 5: a PCB board; 6: an LED chip; 7: a metal terminal; 8: a first pad; 9: a second pad; 10: a control circuit; 11: positioning holes; 12: a first column of LED chips; 13: a second row of LED chips; 14: a first group of LED chips; 15: a second group of LED chips; 16: a third group of LED chips; 17: a fourth group of LED chips; 18: a first region; 19: a second region.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings. As used herein, the terms "upper," "lower," and the like are used with reference to the orientation of FIG. 1.

Example 1:

referring to fig. 1, the present embodiment provides a self-supporting unshaded LED filament, which includes a transparent PCB 5, a plurality of LED chips 6 on the PCB 5, and fluorescent glue covering the peripheries of the PCB 5 and the LED chips 6.

The PCB 5 is provided with a first area 18 and a second area 19, the width of the first area 18 is larger than that of the second area 19, the first area 18 is inserted into the lamp holder 3 of the LED lamp and fixedly connected with the lamp holder 3, the LED chip 6 is arranged on one side of the second area 19, and the first area 18 is provided with a first bonding pad 8 and a second bonding pad 9. The first bonding pad 8 and the second bonding pad 9 are respectively used as an input end and an output end of the LED filament and are connected with a power supply through a positive wire and a negative wire. Because first pad 8 and second pad 9 all set up the one end at the LED filament, rather than both ends, its simple to operate does not have the dark space simultaneously and also can not cause because of the connection problem and be in the light.

The first region 18 and the second region 19 have a conductive pattern, by means of which the LED chip 6 is electrically connected to the circuitry inside the lamp cap 3.

The PCB board 5 sets up one or multiseriate LED chip 6 along width direction, LED chip 6 is divided into one set or multiunit along the length direction of PCB board 5, LED chip 6 is through establishing ties, parallelly connected or the mode interconnect that combines of establishing ties. In addition, a plurality of LED chips 6 are uniformly arranged on the PCB 5 in a matrix form.

In the present embodiment, the second region 19 arranges a column of LED chips 6, one end of each LED chip 6 is connected to the first pad 8, the other end of each LED chip 6 is connected to the second pad 9, and the LED chips 6 are connected in parallel. The first and

second pads

8 and 9 have a thickness of 0.1 to 0.5mm and a strength to stand up. The first bonding pad 8 and the second bonding pad 9 are both arranged below the LED chip 6 to ensure that the top of the LED chip has no dark area.

In a specific embodiment, the PCB is a single layer board, and can be made of transparent materials such as PI, glass fiber, BT, and PET, and preferably, the PCB is an FPC in-line substrate or a hard glass fiber board. Adopt transparent PCB board, can not shelter from the light that LED chip 6 sent, the display effect is good.

The fluorescent glue can be transparent fluorescent glue or colorful fluorescent glue. The color of the colored fluorescent glue can be red, blue, green, yellow, orange or purple. In addition, the LED chip may be an LED monochrome chip or an RGB chip, the LED monochrome chip may emit white light or yellow light, and the RGB chip may emit red light, blue light, and green light. According to actual needs, the periphery of the LED monochromatic chip can be wrapped with the colorful fluorescent glue, or the periphery of the RGB chip can be wrapped with the transparent fluorescent glue, so that different colors of light can be emitted.

Referring to fig. 2, the first bonding pad 8 and the second bonding pad 9 are respectively welded or riveted with a metal terminal 7, the metal terminal 7 is used for welding one end of a positive and negative wire, and the other end of the positive and negative wire is connected with the driving power supply 2 inside the lamp cap 3 or directly connected with an external direct current power supply. It should be further noted that the first pad 8 and the second pad 9 may be directly welded with positive and negative lines without providing the metal terminal 7, and electrically connected to the driving power supply 2 inside the lamp cap 3 through the positive and negative lines. When the metal terminal 7 is not arranged on the bonding pad, the number of components is reduced, and the production cost is reduced. In addition, the positive wire and the negative wire can be clamped on the first bonding pad 8 and the second bonding pad 9 through spring clips.

The self-supporting unshaded LED filament of this embodiment, because the multiunit LED chip is installed on transparent PCB board, compare with prior art, do not need independent support or stem to do the support, its simple structure, low cost to when luminous, can not cause shadow and facula because support or stem shelter from the luminous body, improved the display effect of LED filament.

Example 2:

referring to fig. 3, the present embodiment provides a self-supporting unshaded LED filament, including a transparent PCB board 5, a plurality of LED chips 6 mounted on the PCB board, and a control circuit 10.

The PCB 5 is provided with a first area 18 and a second area 19, the width of the first area 18 is larger than that of the second area 19, the first area 18 is inserted into the lamp holder 3 of the LED lamp and fixedly connected with the lamp holder 3, the LED chip 6 is arranged on one side of the second area 19, the control circuit 10 is arranged on one side of the first area 18, and the first area 18 is further provided with a first bonding pad 8 and a second bonding pad 9.

In addition, a plurality of LED chips 6 are the matrix and evenly arrange on PCB board 5, can be right through control circuit 10 LED chips 6 on the PCB board 5 carry out subregion control.

In this embodiment, two rows of LED chips 6 are arranged on the PCB, and each of the two rows of LED chips 6 includes a first row of LED chips 12 and a second row of LED chips 13, one end of each of the first row of LED chips 12 and the second row of LED chips 13 is connected to the first pad 8, the other end of each of the first row of LED chips 12 is connected to the first control signal terminal of the control circuit 10, the other end of each of the second row of LED chips 13 is connected to the second control signal terminal of the control circuit 10, the positive electrode of the control circuit 10 is connected to the first pad 8, and the negative electrode of the control circuit 10 is connected to the second pad 9.

Fluorescent glue with different colors is respectively wrapped on the peripheries of the first row of LED chips 12 and the second row of LED chips 13, or LED single-color chips with different colors are respectively selected for the first row of LED chips 12 and the second row of LED chips 13, and under the control of the control circuit 10, double-color conversion adjustment is realized. It should be noted that the PCB board is not limited to be provided with 2 rows of LED chips, and may be provided with 3 rows, 4 rows, and 5 rows … … of more columns, and the control circuit 10 is combined to implement multi-color conversion adjustment.

Meanwhile, the PCB 5 can be a multilayer board so as to realize multi-line design and meet the problem of multi-path control signal access. The respective LED chips 6 are connected to each other in series, parallel, or a combination of series and parallel. The control circuit is preferably a control IC, which stores a control program therein and can cyclically read the control program to control the LED chips 6 to emit light. After the multiple rows of LED chips 6 and the control IC are electrified, the IC controls the multiple rows of LED chips 6 to emit light respectively.

The LED filament of this embodiment, through arranging two or multiseriate LED chips 6 on PCB board 5, the fluorescent glue of different colours of parcel again combines control circuit 10, can realize double-colored and many colours transform and adjust.

Example 3:

referring to fig. 4, the present embodiment provides a self-supporting unshaded LED filament, including a transparent PCB board 5, a plurality of LED chips 6 mounted on the PCB board, and a control circuit 10.

The PCB 5 is provided with a first area 18 and a second area 19, the width of the first area 18 is larger than that of the second area 19, the first area 18 is inserted into the lamp holder 3 of the LED lamp and fixedly connected with the lamp holder 3, the LED chip 6 is arranged on one side of the second area 19, the control circuit 10 is arranged on one side of the first area 18, and the first area 18 is further provided with a first bonding pad 8 and a second bonding pad 9. Because the width of the first area 18 is larger than that of the second area 19, after the first area 18 is installed in the lamp cap 3 of the LED lamp, the PCB 5 is more self-supported, and the joint of the first area 18 and the second area 19 is not easy to break.

The LED chips 6 are divided into a plurality of groups of LED chips 6 along the length direction, one ends of the LED chips 6 are connected with the power supply, the other ends of the LED chips 6 are respectively connected with each control signal end of the control circuit 10, and the LED chips 6 on the PCB 5 can be controlled in a partitioning mode through the control circuit 10.

In the present embodiment, the LED chips 6 are divided into a first group of LED chips 14, a second group of LED chips 15, a third group of LED chips 16, and a fourth group of LED chips 17 along the length direction. Referring to fig. 8, one end of each of the first, second, third and fourth groups of

LED chips

14, 15, 16 and 17 is connected to the first pad 8, the other end of the first group of LED chips 14 is connected to the first control signal terminal of the control circuit 10, the other end of the second group of LED chips 15 is connected to the second control signal terminal of the control circuit 10, the other end of the third group of LED chips 16 is connected to the third control signal terminal of the control circuit 10, and the other end of the fourth group of LED chips 17 is connected to the fourth control signal terminal of the control circuit 10; the positive pole of the control circuit 10 is connected with the first bonding pad 8, and the negative pole is connected with the second bonding pad 9.

The four groups of LED chips select LED monochromatic chips with the same color, the four groups of LED chips select LED monochromatic chips with different colors respectively, or the peripheries of the four groups of LED chips are wrapped by fluorescent glue with different colors respectively, and color conversion and/or dynamic conversion adjustment are realized under the control of the control circuit 10. The four groups of LED chips adopt LED single-color chips with the same color, and can dynamically change single color, thereby realizing dynamic display effects such as single-color horse race and the like. The four groups of LED chips respectively select LED single-color chips with different colors or the peripheries of the four groups of LED chips are respectively wrapped with fluorescent glue with different colors, so that the color can be changed, the dynamic change can be realized, and the dynamic display effects of multi-color horse racing and the like can be realized. It should be noted that the LED chips 6 are not limited to be divided into 4 groups of LED chips, but may also be divided into 2 groups, 3 groups, and 5 groups of … …, and in combination with the control circuit 10, not only can the adjustment of multi-color conversion be realized, but also the adjustment of display effects such as a horse race light, a water lamp, a flame light, and a color illusion can be realized.

Meanwhile, the PCB 5 can be a multilayer board so as to realize multi-line design and meet the problem of multi-path control signal access. The control circuit is preferably a control IC, a control program is stored in the control IC, the control IC can read circularly, and can control the LED chips on the PCB in a partitioning manner to control the LED chips 6 to emit light. After the multiple rows of LED chips and the control IC are electrified, the control IC controls the multiple groups of LED chips to respectively emit light so as to realize the effect of multi-color dynamic conversion.

The control circuit further includes a first capacitor C1, a first resistor R1, and a second resistor R2. A first capacitor plate of the first capacitor C1 is connected with the positive electrode line, and a second capacitor plate of the first capacitor C1 is connected with the negative electrode line; one branch of the function selection key end of the control IC is connected with the positive wire through a first resistor R1, and the other branch is connected with the negative wire through a second resistor R2.

The LED filament of this embodiment owing to adopt control circuit 10 multichannel signal to control the monochromatic chip of multiunit LED or the full-color chip of RGB respectively, sets up different range simultaneously, can realize that display effect such as horse race lamp, running water lamp, flame lamp and illusion-colour adjusts to with low costs, display effect is good.

Example 4:

referring to fig. 5, 6 and 7, the present embodiment provides an LED lamp, which mainly includes any one of the LED filaments 1, a lamp holder 3, and a lamp bulb 4 connected to the lamp holder 3. The inside of lamp holder 3 is provided with drive power supply 2 that can export low voltage direct current, LED filament 1 inserts in the fixed slot of drive power supply 2 protective housing, be connected with drive power supply 2 electricity, perhaps directly be connected with external direct current power supply electricity.

When the LED lamp is used, electricity input from the lamp holder 3 supplies power to the direct-insert programming LED lamp filament 1 through the driving power supply 2, or an external direct-current power supply directly supplies power to the LED lamp filament 1 through the lamp holder 3.

A positioning column is arranged in a fixing clamping groove of the driving power supply 2, a positioning hole matched with the positioning column is formed in the first area 18 of the PCB 5, and the positioning column is inserted into the positioning hole, so that the LED lamp filament 1 and the lamp holder 3 are fixedly connected together, and the LED lamp filament 1 is prevented from loosening.

The LED lamp of this embodiment, owing to adopt self-supporting no shadow LED filament 1, compare with prior art, the LED filament does not need independent support or stem to do the support, its simple structure, low cost to when luminous, can not cause shadow and facula because support or stem shelter from the luminous body, improved the display effect of LED lamp.

In the description of the present invention, it is to be understood that the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.

In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that modifications, alterations, substitutions and variations may be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims

1. The utility model provides a self-supporting unshaded LED filament for assemble LED lamps and lanterns which characterized in that: the LED filament comprises a transparent PCB (5), a plurality of LED chips (6) and fluorescent glue covering the peripheries of the PCB (5) and the LED chips (6);

the PCB (5) is provided with a first area (18) and a second area (19), the width of the first area (18) is larger than that of the second area (19), the first area (18) is inserted into a lamp holder (3) of the LED lamp and fixedly connected with the lamp holder (3), and the LED chip (6) is arranged on one side of the second area (19);

the first region (18) and the second region (19) have a conductive pattern, by means of which the LED chip (6) is electrically connected to a circuit inside the lamp cap (3).

2. The LED filament of claim 1, wherein: a first bonding pad (8) and a second bonding pad (9) are arranged on the first area (18), and the thickness of the first bonding pad (8) and the thickness of the second bonding pad (9) are 0.1-0.5 mm.

3. The LED filament of claim 2, wherein: the second area (19) is provided with a row of LED chips (6), one end of each LED chip (6) is connected with the first bonding pad (8), and the other end of each LED chip (6) is connected with the second bonding pad (9).

4. The LED filament of claim 2, wherein: the first area (18) is also provided with a control circuit (10), and the control circuit (10) stores a control program and is provided with a plurality of control signal ends;

the positive pole of the control circuit (10) is connected with the first bonding pad (8), and the negative pole is connected with the second bonding pad (9).

5. The LED filament of claim 4, wherein: the second region (19) is arranged with two columns of LED chips (6): the LED display device comprises a first row of LED chips (12) and a second row of LED chips (13), wherein one ends of the first row of LED chips (12) and the second row of LED chips (13) are connected with a first bonding pad (8), the other ends of the first row of LED chips (12) are connected with a first control signal end of a control circuit (10), and the other ends of the second row of LED chips (13) are connected with a second control signal end of the control circuit (10);

the peripheries of the first row of LED chips (12) and the second row of LED chips (13) are respectively wrapped with fluorescent glue with different colors, or the first row of LED chips (12) and the second row of LED chips (13) are respectively selected from LED single-color chips with different colors, and under the control of the control circuit (10), double-color conversion adjustment is realized.

6. The LED filament of claim 4, wherein: the LED chips (6) are divided into a first group of LED chips (14), a second group of LED chips (15), a third group of LED chips (16) and a fourth group of LED chips (17) along the length direction of the PCB (5);

one end of each of the first group of LED chips (14), the second group of LED chips (15), the third group of LED chips (16) and the fourth group of LED chips (17) is connected with the first bonding pad (8), the other end of each of the first group of LED chips (14) is connected with a first control signal end of the control circuit (10), the other end of each of the second group of LED chips (15) is connected with a second control signal end of the control circuit (10), the other end of each of the third group of LED chips (16) is connected with a third control signal end of the control circuit (10), and the other end of each of the fourth group of LED chips (17) is connected with a fourth control signal end of the control circuit (10);

the four groups of LED chips are LED single-color chips with the same color, the four groups of LED chips are LED single-color chips with different colors respectively, or the peripheries of the four groups of LED chips are wrapped by fluorescent glue with different colors respectively, and color conversion and/or dynamic conversion adjustment are realized under the control of the control circuit (10).

7. The LED filament of claim 2, wherein: the first pad (8) and the second pad (9) are respectively welded or riveted with a metal terminal (7).

8. The LED filament of claim 1, wherein: the LED chip (6) is an LED single-color chip or an RGB chip;

the PCB (5) is a single-layer board or a multi-layer board, and the PCB (5) is made of PI, glass fiber, BT or PET transparent materials.

9. An LED lamp is characterized by comprising the LED filament (1) as claimed in any one of claims 1 to 8, a lamp holder (3) and a lamp bulb shell (4) connected with the lamp holder (3), wherein a driving power supply (2) capable of outputting low-voltage direct current is arranged inside the lamp holder (3), and the LED filament (1) is inserted into a fixed clamping groove of a protective shell of the driving power supply (2) and is electrically connected with the driving power supply (2) or is directly and electrically connected with an external direct current power supply;

a positioning column is arranged in a fixing clamping groove of the protective shell of the driving power supply (2), a first area (18) of the PCB (5) is provided with a positioning hole matched with the positioning column, and the positioning column is inserted into the positioning hole.