CN201100563Y - Lamp module - Google Patents

Abstract

The utility model provides a lamp module for use in a direct-type backlight module of a flat panel display. The lamp module includes at least one first module and at least one second module. The transformer of the first module includes a first voltage end and a second voltage end. One end of two series-connected lamps is respectively connected to the first voltage end and the second voltage end of the transformer, and the two lamps are driven by one transformer. The first module and the second module have the same components. The first module and the second module are reversely staggered.

Description

Lamp module

technical field

The utility model relates to a backlight module of a plane display, in particular to a configuration structure of a lamp tube and a transformer of a direct-down backlight module.

Background technique

The direct-lit flat-panel display generates images through the direct transmission of the light source provided by the lamp module at the bottom. As the size of the liquid crystal panel becomes larger and larger, the number of backlight lamps used is also increasing, resulting in the complexity of its driving device. It often makes it difficult to balance benefits between cost and features.

FIG. 1A is a schematic diagram of a conventional lamp module. The circuit substrate 11 of the lamp module 1 is used to provide the basic current, and a positive-phase transformer 12 and a negative-phase transformer 13 are arranged on it, and two lamp tubes 14 are connected in series between the positive-phase transformer 12 and the negative-phase transformer 13, wherein the terminal V ₁ and terminal _V2 respectively represent the AC voltage provided by the positive-phase transformer 12 and negative-phase transformer 13, and its timing diagram is shown in Figure 1B. The phase difference between _V1 and _V2 is 180 degrees, and the peak voltage and frequency are the same. The loop formed in this way can save the processing cost of the ground loop. However, each lamp tube still needs a corresponding positive-phase transformer 12 or negative-phase transformer 13, so more transformers are used. In addition, because of the leakage between the lamp tube 14 and the casing (not shown), the end of the lamp tube 14 near the positive phase transformer 12 and the negative phase transformer 13 has a higher brightness, and the brightness of the lamp tube 14 is from one end to the other end. Gradually weakens, so that the brightness at both ends of the lamp tube 14 is uneven, resulting in poor balance of brightness between the left and right sides of the lamp tube module 1 .

FIG. 2 is a schematic diagram of another conventional lamp module. Two transformers 22 are installed on the circuit substrate 21 of the lamp module 2, each transformer 22 includes a positive high-voltage terminal V ₁ and a negative high-voltage terminal V ₂ , and one end of two series-connected parallel lamp tubes 24 is respectively connected to The positive high-voltage terminal V ₁ and the negative high-voltage terminal V ₂ of the same transformer 22 are driven by one transformer 22 to drive two lamp tubes 24, which uses fewer transformers than the lamp tube module 1 in FIG. The same end of the tube 24, so the lamp tube module 2 still has the problems of uneven brightness and poor brightness balance.

Therefore, how to provide a lamp module for reducing the uneven brightness of the lamp module and reducing the usage of the transformer is an important issue.

Utility model content

In view of the above problems, an object of the present invention is to provide a lamp module, which can reduce the problem of uneven brightness of the lamp module by using the configuration of the transformer.

Another object of the present invention is to provide a lamp module for reducing the usage of transformers.

In order to achieve the above object, the utility model proposes a lamp module for a direct-lit backlight module of a flat panel display, the lamp module includes at least one first module and at least one second module. The first module includes a transformer with a first voltage terminal and a second voltage terminal, at least one first lamp tube and at least one second lamp tube. The first voltage terminal is used for providing the alternating current with the first phase, and the second voltage terminal is used for providing the alternating current with the second phase. In the first module, the first light tube includes a first end and a second end, and the first end of at least one first light tube is coupled to a single first voltage end. The second lamp tube includes a third terminal and a fourth terminal. The third terminal of at least one second lamp tube is coupled to a single second voltage terminal, and each second terminal is coupled to a fourth terminal. The second module has the same components as the first module. The transformer of the first module is arranged at the first end of the first lamp tube and the third end of the second lamp tube. The transformer of the second module is arranged at the second end of the first lamp tube. end and the fourth end of the second lamp tube, that is, the transformer of the first module is arranged at one end of the lamp tube, and the transformer of the second module is arranged at the other end of another group of lamp tubes. The light tube module is formed by interleaving the first module and the second module.

In order to achieve the above object, the utility model proposes another lamp module including at least one first module and at least one second module. The first module includes: a transformer with multiple first voltage terminals and multiple second voltage terminals, multiple first lamp tubes and multiple second lamp tubes. The first terminal of each first lamp tube is coupled to a first voltage terminal, the third terminal of each second lamp tube is coupled to a second voltage terminal, and the second terminal of each first lamp tube is coupled to Connect to the fourth end of a second lamp tube. The components of the second module are the same as those of the first module. The transformer of the first module is arranged at one end of the first lamp tube and the second lamp tube, and the second module is arranged at the other end of another group of lamp tubes. The light tube module is formed by interleaving the first module and the second module.

In order to achieve the above object, the utility model proposes another lamp module including at least one first module and at least one second module. The first module includes a first transformer with a first voltage terminal, a second transformer with a second voltage terminal, a first lamp tube and a second lamp tube. The difference from the above lamp module is that the first voltage terminal of the transformer in the first module and the second module is replaced by a first transformer, the second voltage terminal of the transformer is replaced by a second transformer, and the first transformer and the second transformer to drive the first lamp tube and the second lamp tube connected in series.

As mentioned above, the transformer of the first module of the lamp tube module of the present invention is arranged at one end of the lamp tube, the transformer of the second module is arranged at the other end of another group of lamp tubes, and the lamp tube module is formed by interlacing two kinds of modules. Therefore, the problems of uneven brightness and poor brightness balance at both ends of the lamp module can be reduced. Since one transformer can drive multiple lamp tubes, the usage of transformers can be reduced.

Description of drawings

FIG. 1A is a schematic diagram of a conventional lamp module.

FIG. 1B is a timing diagram of V ₁ and V ₂ in FIG. 1A .

FIG. 2 is a schematic diagram of another conventional lamp module.

FIG. 3 is a schematic circuit diagram of a lamp module according to an embodiment of the present invention.

FIG. 4 is a schematic circuit diagram of a lamp module according to another embodiment of the present invention.

FIG. 5 is an application example of the lamp module shown in FIG. 4 .

FIG. 6 is a schematic circuit diagram of a lamp module according to another embodiment of the present invention.

FIG. 7 is a schematic circuit diagram of a lamp module according to yet another embodiment of the present invention.

Description of reference symbols

1, 2, 3, 4, 6, 7: lamp module 11, 21: circuit board

12: Positive phase transformer 13: Negative phase transformer

14, 24: Lamp 22, 31, 41, 61: Transformer

301, 401, 601, 701: first mode 302, 402, 602, 702: second mode

block block block

33: The first light tube 331: The first end

332: Second end 34: Second light tube

341: The third end 342: The fourth end

35: First circuit board 36: Second circuit board

71: The first transformer 72: The second transformer

V ₁ : first voltage terminal, positive high voltage terminal V ₂ : second voltage terminal, negative high voltage terminal

V ₀ , V ₃ , V ₄ : endpoints V _D : peak value

C ₁ , V ₂ , C ₃ , V ₄ : capacitance

Detailed ways

The lamp module according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 3 is a schematic circuit diagram of a lamp module according to an embodiment of the present invention. The lamp module 3 is used in a direct-lit backlight module of a flat panel display, and the lamp module 3 includes at least one first module 301 and at least one second module 302 .

The first module 301 includes a transformer 31, a first lamp tube 33 and a second lamp tube 34, although Fig. 3 only shows a first lamp tube 33 and a second lamp tube 34, but the utility model does not As a limitation, the present invention can use a transformer to drive the lamp module of at least one first lamp 33 and at least one second lamp 34 . The transformer 31 includes a first voltage terminal V ₁ and a second voltage terminal V ₂ , the first voltage terminal V ₁ is used to provide an AC power with a first phase, and the second voltage terminal V ₂ is used to provide an AC power with a second phase. The first phase of V ₁ and the second phase of V ₂ have a difference of 180 degrees, while the peak V _D and frequency are the same, the potentials of V ₁ and V ₂ are alternating voltages that change with time, that is, when V ₁ is When the voltage is positive, V ₂ is a negative voltage, and the relationship between the two has always been one positive and one negative. At this time, in Figure 3, the "+" of the first voltage terminal V ₁ indicates a positive high voltage, and the "+" of the second voltage terminal V ₂ -" indicates that it is a negative high pressure.

In the first module 301, the first lamp tube 33 includes a first end 331 and a second end 332, the first end 331 of the first lamp tube 33 is coupled to the first voltage terminal V1 of the transformer 31, and the second end 332 is coupled to a terminal V ₀ . The second lamp 34 has a third terminal 341 and a fourth terminal 342, the third terminal 341 of the second lamp 34 is coupled to the second voltage terminal V ₂ , the fourth terminal 342 is coupled to the terminal V ₀ , Therefore, each transformer 31 drives two lamps connected in series. The first lamp 33 and the second lamp 34 can be cold cathode fluorescent lamps (Cold cathode fluorescent lamp, CCFL), external electrode fluorescent lamps (External Electrode Fluorescent Lamp, EEFL) or hot cathode lamps (Hot Cathode Fluorescent Lamp, HCFL), But not limited to this.

The second module 302 has the same components as the first module 301 , the second terminal 332 of the first lamp 33 is coupled to the first voltage terminal V ₁ of the transformer 31 , and the first terminal 331 is coupled to the terminal V ₀ . The fourth terminal 342 of the second lamp 34 is coupled to the second voltage terminal V ₂ of the transformer 31 , and the third terminal 341 is coupled to the terminal V ₀ .

That is, in the first module 301, the transformer 31 is arranged at one end of the first lamp 33 and the second lamp 34, and in the second module 302, the transformer 31 is arranged at the first lamp 33 and the second lamp 34. At the other end, the lamp module 3 is formed by interleaving the first module 301 and the second module 302 .

In addition, the lamp module 3 also includes a first circuit substrate 35 and a second circuit substrate 36, the transformer 31 of the first module 301 is arranged on the first circuit substrate 35, and the transformer 31 of the second module 302 is arranged on the on the second circuit substrate 36 . The first circuit board 35 is used to provide the basic current to make the transformer 31 of the first module 301 generate the first phase and the second phase of alternating current to drive the lamp, forming a circuit. The second circuit substrate 36 is used to provide the basic current to make the transformer 31 of the second module 302 generate the first-phase and second-phase alternating current to drive the lamp tube and form a circuit.

FIG. 4 is a schematic circuit diagram of a lamp module according to another embodiment of the present invention. The transformer 41 has a first voltage terminal V ₁ and a second voltage terminal V ₂ , the first voltage terminal V ₁ can drive two first lamp tubes 33 , and the second voltage terminal V ₂ can drive two second lamp tubes 34. However, the present invention is not limited thereto. This embodiment can be extended to drive multiple first lamp tubes 33 by the first voltage terminal _V1 , and drive multiple second lamp tubes 34 by the second voltage terminal _V2 . .

Referring to FIG. 4 , the lamp module 4 includes at least one first module 401 and at least one second module 402 .

The first module 401 includes a transformer 41 with a first voltage terminal V ₁ and a second voltage terminal V ₂ , two first lamp tubes 33 and two second lamp tubes 34 . The first terminals 331 of the two first lamp tubes 33 are coupled to the first voltage terminal V ₁ , the third terminals 341 of the two second lamp tubes 34 are coupled to a single second voltage terminal V ₂ , a first lamp tube The second terminal 332 of 33 is coupled to terminal V ₃ , the fourth terminal 342 of a second lamp 34 is coupled to this terminal V ₃ , and the second terminal 332 of the other first lamp 33 is coupled to terminal V ₄ , the fourth terminal 342 of another second lamp tube 34 is coupled to the terminal V ₄ . That is, a first lamp 33 coupled to the first voltage terminal _V1 is coupled in series to a second lamp 34 at the second voltage terminal _V2 . In addition, the terminal V ₃ of this embodiment can be further coupled to the terminal V ₄ .

The second module 402 has the same components as the first module 401 , and the difference from the first module is that the transformer 41 of the second module 402 is disposed at the other end of the two first light tubes 33 and the two second light tubes 34 . The second terminals 332 of the two first lamp tubes 33 are coupled to the first voltage terminal V ₁ of the transformer 41 , and the fourth terminals 342 of the two second lamp tubes 34 are coupled to the second voltage terminal V ₂ . The first end 331 of a first light tube 33 is coupled to the terminal V ₃ , the third end 341 of a second light tube 34 is coupled to the terminal V ₃ , and the first end 331 of the other first light tube 33 is coupled to the terminal V 3 . It is connected to the terminal V ₄ , and the third terminal 341 of the second lamp 34 is coupled to the terminal V ₄ , that is, a first lamp 33 and a second lamp 34 are connected in series. In addition, the terminal V ₃ of the present invention can be further coupled to the terminal V ₄ . The lamp module 4 is formed by interleaving the first module 401 and the second module 402 .

FIG. 5 is an application example of the lamp module shown in FIG. 4 . When the first lamp tube 33 and the second lamp tube 34 are cold-cathode tubes, each first lamp tube 33 is coupled to the front of the first voltage terminal _V1 , or each second lamp tube 34 is coupled to the second voltage Before the terminal V ₂ , a capacitor C ₁ , C ₂ , C ₃ or C ₄ can be connected in series for voltage stabilization, and then coupled to the first voltage terminal V ₁ or the second voltage terminal V ₂ .

FIG. 6 is a schematic circuit diagram of another embodiment of the present invention. The single transformer in this embodiment has a plurality of first voltage terminals V ₁ and a plurality of second voltage terminals V ₂ , each voltage terminal is coupled to a lamp, so that one transformer drives multiple lamps simultaneously.

As shown in FIG. 6 , the lamp module 6 includes at least one first module 601 and at least one second module 602 , and the lamp module 6 is formed by interlacing the first modules 601 and the second modules 602 .

The first module 601 includes a transformer 61 , multiple first light tubes 33 and multiple second light tubes 34 . The transformer 61 includes a plurality of first voltage terminals V ₁ and a plurality of second voltage terminals V ₂ . For the description of the first voltage terminals V ₁ and the second voltage terminals V ₂ , please refer to FIG. 1B and its description, and will not be repeated here. The first terminal 331 of each first lamp 33 is coupled to a first voltage terminal V ₁ , the third terminal 341 of each second lamp 34 is coupled to a second voltage terminal V ₂ , and each second The terminal 332 is coupled to a fourth terminal 342 .

The second module 602 has the same components as the first module 601. The transformer 61 of the first module 601 is arranged at one end of the lamp tube, and the transformer 602 of the second module is arranged at the other end of the lamp tube. Details are as follows. The second terminal 332 of each first lamp 33 of the second module 602 is coupled to a first voltage terminal V ₁ , and the fourth terminal 342 of each second lamp 34 is coupled to a second voltage terminal V ₂ , each first end 331 is coupled to a third end 341 .

In addition, the lamp module 6 also includes a first circuit substrate (not shown) and a second circuit substrate (not shown), the transformer 61 of the first module 601 is arranged on a first circuit substrate, and the second module The transformers 61 of 602 are all arranged on the second circuit substrate.

FIG. 7 is a schematic circuit diagram of a lamp module according to yet another embodiment of the present invention. The difference between Fig. 7 and Fig. 3 is that the lamp module 7 is replaced by the first and second transformers 71, 72 respectively having a first voltage end and a second voltage end in Fig. 3 having a first voltage end and a second voltage end. The single transformer 31 at the second voltage end, and other circuit connections are the same as those in FIG. 3 , and will not be repeated here.

The lamp module 7 includes at least one first module 701 and at least one second module 702 , and the lamp module 7 is formed by interlacing the first modules 701 and the second modules 702 .

In summary, the lamp module of the present utility model changes the transformers that are originally arranged at the same end of the lamp tube into two modules, the transformer of one module is arranged at one end of the lamp tube, and the transformer of the other module is arranged at the end of the lamp tube. At the other end, the lamp module is formed by interlacing two types of modules, so that the lamp module can reduce the problems of uneven brightness and poor brightness balance at both ends of the lamp module.

In addition, one transformer can drive multiple lamps, which can reduce the usage of transformers.

The above description is for illustration only and not for limitation. Any equivalent modification or change without departing from the spirit and scope of the present invention shall be included in the scope of the claims of the present invention.

Claims (23)

1. A lamp module, characterized in that it comprises: At least one first module and at least one second module, which respectively include: A transformer, comprising: a first voltage terminal; and a second voltage terminal; at least one first lamp tube, one end of which is coupled to the first voltage end; and at least one second lamp tube, one end of which is coupled to the second voltage terminal, and the other end of each first lamp tube is coupled to the other end of each second lamp tube; Wherein the first module and the second module are reversely staggered. 2. The lamp module as claimed in claim 1, wherein the AC power provided by the first voltage terminal and the second voltage terminal is an AC voltage that varies with time and has the same peak value and frequency. 3. The lamp module as claimed in claim 2, wherein the first voltage terminal is used to provide AC power with a first phase, the second voltage terminal is used to provide AC power with a second phase, and the first voltage terminal is used to provide AC power with a second phase. The phase is one hundred and eighty degrees different from the second phase. 4. The lamp module as claimed in claim 1, wherein the first lamp and the second lamp are cold cathode lamps, external electrode fluorescent lamps or hot cathode lamps. 5. The lamp module as claimed in claim 1, further comprising a first circuit board, and all the transformers of the at least one first module are disposed on the first circuit board. 6. The lamp module as claimed in claim 1, further comprising a second circuit board, and all the transformers of the at least one second module are disposed on the second circuit board. 7. The light tube module according to claim 1, wherein when the first light tube and the second light tube are multiple, each of the first light tube and each second light tube is first connected in series A capacitor is coupled to the first voltage terminal or the second voltage terminal. 8. The light tube module as claimed in claim 1, wherein the light tube module is used for a direct type backlight module of a flat panel display. 9. A lamp module, characterized by comprising: At least one first module and at least one second module, which respectively include: A transformer, comprising: a plurality of first voltage terminals; and a plurality of second voltage terminals; a plurality of first lamp tubes, one end of each of the first lamp tubes is correspondingly coupled to the plurality of first voltage terminals; and a plurality of second lamp tubes, one end of each of the second lamp tubes is correspondingly coupled to the plurality of first voltage terminals, and the other end of each of the first lamp tubes is coupled to the other end of each of the second lamp tubes; Wherein the first module and the second module are arranged reversely and alternately. 10. The lamp module as claimed in claim 9, wherein the AC power provided by the first voltage terminal and the second voltage terminal is an AC voltage that varies with time and has the same peak value and frequency. 11. The lamp module as claimed in claim 10, wherein the first voltage terminal is used to provide AC power with a first phase, the second voltage terminal is used to provide AC power with a second phase, and the first voltage terminal is used to provide AC power with a second phase. The phase is one hundred and eighty degrees different from the second phase. 12. The lamp module as claimed in claim 9, wherein the first lamp and the second lamp are cold cathode lamps, external electrode fluorescent lamps or hot cathode lamps. 13. The lamp module according to claim 9, further comprising a first circuit board, and all the transformers of the at least one first module are disposed on the first circuit board. 14. The lamp module according to claim 9, further comprising a second circuit board, all the transformers of the at least one second module are arranged on the second circuit board 15. The light tube module as claimed in claim 9, wherein the light tube module is used for a direct type backlight module of a flat panel display. 16. The lamp module as claimed in claim 9, further comprising a plurality of capacitors coupled between the first voltage terminal or the second voltage terminal and the first or the second lamp tube. 17. A lamp module, characterized by comprising: At least one first module and at least one second module, which respectively include: a first transformer; a second transformer; a first lamp tube, one end of which is coupled to the first transformer; and a second lamp tube, one end of which is coupled to the second transformer, and the other end of which is coupled to the other end of the first lamp tube; Wherein the first module and the second module are arranged reversely and alternately. 18. The lamp module as claimed in claim 17, wherein the AC power provided by the first voltage terminal and the second voltage terminal is an AC voltage that varies with time, and has the same peak value and frequency. 19. The lamp module as claimed in claim 18, wherein the first transformer is used to provide AC power with a first phase, the second transformer is used to provide AC power with a second phase, and the first phase and The second phase is one hundred and eighty degrees out of phase. 20. The lamp module as claimed in claim 17, wherein the first lamp and the second lamp are cold cathode lamps, external electrode fluorescent lamps or hot cathode lamps. 21. The lamp module according to claim 17, further comprising a first circuit board, all the first transformers and the second transformers of the at least one first module are arranged on the first circuit board . 22. The lamp module according to claim 17, further comprising a second circuit board, all the first transformers and the second transformers of the at least one second module are arranged on the second circuit board . 23. The light tube module as claimed in claim 17, wherein the light tube module is used for a direct type backlight module of a flat panel display.

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