Lighting device and method for adjusting light attribute of the same

1. A lighting device, comprising:

at least one filament group having a first end and a second end, wherein each filament group comprises at least one filament, each filament comprises at least one first light emitting unit and at least one second light emitting unit, which are connected in anti-parallel, and the first light emitting unit and the second light emitting unit have different light attributes from each other; and

a light attribute adjusting unit, which is connected to both ends of each filament group to adjust a light attribute of light emitted from the lighting device;

wherein the light attribute adjusting unit comprises a control unit, at least one first switch pair and at least one second switch pair, the first end of each filament group being connected to one of the at least one first switch pair, and the second end of each filament group being connected to one of the at least one second switch pair; and

wherein the light attribute of the emitted light is different from the light attribute of any light emitting unit.

2. The lighting device according to claim 1 , wherein the light attribute adjusting unit adjusts the light attribute of the light emitted from the lighting device by controlling the on/off state and a turn-on duration in the on-state of the first light emitting unit and the second light emitting unit in each filament group.

3. The lighting device according to claim 1 , wherein each filament group comprises several identical filaments, and the several identical filaments are connected in series or in parallel.

4. The lighting device according to claim 1 , wherein the at least one filament group comprises a first filament group and a second filament group, any light emitting unit in the first filament group and any light emitting unit in the second filament group have different light attributes from each other, and at any timing, only the first light emitting unit or the second light emitting unit in one filament group in the lighting device is turned on, and

the second end of the first filament group and the first end of the second filament group are connected to each other and are commonly connected to the light attribute adjusting unit.

5. The lighting device according to claim 1 , wherein the control unit of the light attribute adjusting unit controls whether each light emitting unit in each filament group is in an on-state and a duty ratio of the turn-on duration in the on-state within one light emitting period, so that the light emitting units having different light attributes from each other in the lighting device are turned on alternately within one light emitting period, so as to generate an additional light attribute that is different from the light attribute of any light emitting unit.

6. The lighting device according to claim 1 , wherein each of the first switch pair and the second switch pair comprises a first switch and a second switch that are electrically connected, the first switch is connected to a positive end of a voltage, the second switch is connected to a negative end of the voltage, the first switch and the second switch of each switch pair are commonly connected to the first end or the second end of the filament group that is connected to the switch pair, and

the first light emitting unit of each filament group is turned on when the first switch of the first switch pair and the second switch of the second switch pair are turned on, and the second light emitting unit of each filament group is turned on when the second switch of the first switch pair and the first switch of the second switch pair are turned on.

7. The lighting device according to claim 6 , wherein each switch pair further comprises switch drivers corresponding to the first switch and the second switch respectively, and the control unit sends switch control signals to the switch drivers, so that the switch drivers control the turn-on and the duty ratio of the turn-on duration within one light emitting period of the first switch or the second switch.

8. The lighting device according to claim 1 , wherein the control unit comprises any one or more of a micro-control unit, a Bluetooth control unit, a WIFI control unit and an infrared control unit; and

wherein the control unit receives an external input signal indicating a light attribute, so as to output switch control signals to each switch pair.

9. A lighting device, comprising:

at least one filament group, wherein each filament group comprises at least one filament, each filament comprises at least one first light emitting unit and at least one second light emitting unit, which are connected in anti-parallel, and the first light emitting unit and the second light emitting unit have different colors from each other; and

a color adjusting unit, which is connected to both ends of each filament group, so that the color of light emitted from the lighting device is switchable between the colors of different light emitting units;

wherein the color adjusting unit comprises a switch unit for receiving an external input signal to switch between different light emitting units for turn-on, so as to switch the color of the light emitted from the lighting device; and

wherein the switch unit is a double-pole four-throw mechanical switch comprises a first pole, a second pole, a first fixed end, a second fixed end, and a first movable end to an eighth movable end,

the first pole is connected to a positive end of a voltage via the first fixed end, and is switchable between the first movable end to the fourth movable end, so as to be connected to one end of the first light emitting unit or the second light emitting unit in one filament group of the lighting device via one of the first movable end to the fourth movable end, and

the second pole is connected to a negative end of the voltage via the second fixed end, and is switchable between the fifth movable end to the eighth movable end, so as to be connected to the other end of the first light emitting unit or the second light emitting unit in the one filament group of the lighting device via one of the fifth movable end to the eighth movable end.

10. The lighting device according to claim 9 , wherein, each filament group has a first end and a second end, each filament group comprises several identical filaments, and the several identical filaments are connected in series or in parallel; and

the at least one filament group comprises a first filament group and a second filament group, any light emitting unit in the first filament group and any light emitting unit in the second filament group have different light attributes from each other, and at any timing, only the first light emitting unit or the second light emitting unit in one filament group in the lighting device is turned on, and

the second end of the first filament group and the first end of the second filament group are connected to each other and are commonly connected to the color adjusting unit.

11. A lighting device, comprising:

a first filament group and a second filament group, wherein each filament group comprises at least one filament, each filament comprises at least one first light emitting unit and at least one second light emitting unit, which are connected in anti-parallel, the first light emitting unit and the second light emitting unit have different color temperatures from each other, any light emitting unit in the first filament group and any light emitting unit in the second filament group have different color temperatures from each other, and at any timing, only the first light emitting unit or the second light emitting unit in one filament group in the lighting device is turned on; and

a double-pole four-throw mechanical switch, which is connected to both ends of each filament group, so that the color temperature of light emitted from the lighting device is switchable between the color temperatures of different light emitting units, wherein,

the double-pole four-throw mechanical switch comprises a first pole, a second pole, a first fixed end, a second fixed end, and a first movable end to an eighth movable end,

the first pole is connected to a positive end of a voltage via the first fixed end, and is switchable between the first movable end to the fourth movable end, so as to be connected to one end of the first light emitting unit or the second light emitting unit in one filament group of the lighting device via one of the first movable end to the fourth movable end, and

the second pole is connected to a negative end of the voltage via the second fixed end, and is switchable between the fifth movable end to the eighth movable end, so as to be connected to the other end of the first light emitting unit or the second light emitting unit in the one filament group of the lighting device via one of the fifth movable end to the eighth movable end.

12. A method for adjusting a light attribute of a lighting device, wherein the lighting device comprises at least one filament group having a first end and a second end and (ii) comprising a first filament group having a first end connected to a first switch pair and a second end connected to a second switch pair, the first switch pair and the second switch pair each comprising a first switch and a second switch, and wherein each filament group comprises at least one filament, each filament comprises at least one first light emitting unit and at least one second light emitting unit, which are connected in anti-parallel, and the first light emitting unit and the second light emitting unit have different light attributes from each other; and the method comprises:

in response to an input signal from the outside indicating a light attribute of a first light emitting unit of the first filament group, adjusting a light attribute of light emitted from the lighting device by, controlling to turn on the first switch of the first switch pair and the second switch of the second switch pair, so that the first light emitting unit of the first filament group is turned on to emit light, or

in response to the input signal from the outside indicating a light attribute of a second light emitting unit of the first filament group, controlling to turn on the second switch of the first switch pair and the first switch of the second switch pair, so that the second light emitting unit of the first filament group is turned on to emit light;

wherein the first switch and the second switch are electrically connected, the first switch is connected to a positive end of a voltage, the second switch is connected to a negative end of the voltage, and the first switch and the second switch are commonly connected to the first end or the second end of the filament group that is connected to the first switch pair and the second switch pair.

13. The method for adjusting the light attribute of the lighting device according to claim 12 , wherein the step of adjusting the light attribute of the light emitted from the lighting device by controlling the light emitting state of each light emitting unit in the lighting device further comprises:

only controlling the on/off state of the first light emitting unit and the second light emitting unit in each filament group, so that the light attribute of the light emitted from the lighting device is switched between the light attributes of different light emitting units.

14. The method for adjusting the light attribute of the lighting device according to claim 12 , wherein the step of adjusting the light attribute of the light emitted from the lighting device by controlling the light emitting state of each light emitting unit in the lighting device further comprises:

controlling the on/off state and a turn-on duration in the on-state of the first light emitting unit and the second light emitting unit in each filament group, so that the light attribute of the light emitted from the lighting device is different from the light attribute of any light emitting unit.

15. The method for adjusting the light attribute of the lighting device according to claim 14 , wherein by controlling whether the first light emitting unit and the second light emitting in each filament group are in an on-state and a duty ratio of the turn-on duration in the on-state within one light emitting period, the light emitting units having different light attributes from each other in the lighting device are turned on alternately within one light emitting period, so as to generate an additional light attribute that is different from the light attribute of any light emitting unit.