TWI416990B - Light source module, backlight module and control method of light source module - Google Patents

Abstract

A light source module includes a first light-emitting unit, a second light-emitting unit, a third light-emitting unit, a fourth light-emitting unit, a driving unit, a feedback unit and a control unit. A first terminal of the second light-emitting unit is electrically connected with a first terminal of the first light-emitting unit. A first terminal of the third light-emitting unit is electrically connected with a second terminal of the first light-emitting unit. A first terminal of the fourth light-emitting unit is electrically connected with a second terminal of the second light-emitting unit. A second terminal of the fourth light-emitting unit is electrically connected with a second terminal of the third light-emitting unit. The feedback unit is electrically connected with the first terminal of the first light-emitting unit and the second terminal of the third light-emitting unit, and outputs a feedback signal with unity polarity. The control unit outputs a control signal to control the driving unit in accordance with the feedback signal.

Description

Light source module, backlight module and control method of light source module

The invention relates to a light source module, a backlight module and a control method of the light source module.

In today's society, light source is one of the indispensable items. All lighting devices, indicating devices or display devices must use light sources. Taking a display device as an example, a backlight module is required to provide light, so that an image can be displayed. And in the backlight module A fluorescent lamp is used as the light-emitting unit, and an AC drive signal is outputted by a driving circuit board to drive the fluorescent lamp to emit light.

However, as the technology goes further, the light-emitting diodes are gradually being widely used because of their small size, low power consumption, no radiation, no mercury, long life, fast response, and high reliability. Among the various devices that require a light source, the backlight module is one of them.

Generally speaking, the light-emitting diode is driven by a DC power supply. However, since the current driving circuit board applied to the backlight module is an output AC driving signal, the operator will emit light under the premise that the driving circuit board is not greatly modified. The pole body is modularized and driven by AC drive signals.

For example, the LED module has a plurality of LEDs connected in anti-parallel connection, so that the AC driving signal can be used for driving. Because the light-emitting diode limits the AC drive signal to flow in a single direction, when the feedback signal is retrieved from one of the positive terminal or the negative terminal of the LED module, the feedback signal is a positive polarity. A signal or a negative feedback signal.

However, the positive feedback signal and the negative feedback signal need to be analyzed by different control units or more powerful control units to analyze the feedback signal, thereby increasing the space occupied by the components and increasing the cost. . Therefore, how to provide a light source module, a backlight module and a control method of a light source module without increasing the computational load of the component without increasing the space occupied by the component is one of the current important issues.

In view of the above problems, an object of the present invention is to provide a light source module, a backlight module, and a control method for a light source module that do not increase the computational load of the components without increasing the space occupied by the components.

To achieve the above objective, the present invention provides a light source module including a first light emitting unit, a second light emitting unit, a third light emitting unit, a fourth light emitting unit, a driving unit, a feedback unit, and a light source module. control unit. The first end of one of the second light emitting units is electrically connected to the first end of the first light emitting unit. The first end of one of the third lighting units is electrically connected to the second end of one of the first lighting units. The first end of the fourth light emitting unit is electrically connected to the second end of the second light emitting unit, and the second end is electrically connected to the second end of the third light emitting unit. The driving unit drives the first lighting unit, the second lighting unit, the third lighting unit and the fourth lighting unit according to a power signal outputting an AC driving signal. The feedback unit is electrically connected to the first end of the first lighting unit and the second end of the third lighting unit, and outputs one feedback signal of a single polarity. The control unit outputs a control signal to control the driving unit according to the feedback signal.

To achieve the above objective, the present invention provides a backlight module including a first light emitting unit, a second light emitting unit, a third light emitting unit, a fourth light emitting unit, a driving unit, a feedback unit, and a control unit. The first end of one of the second light emitting units is electrically connected to the first end of the first light emitting unit. The first end of one of the third lighting units is electrically connected to the second end of one of the first lighting units. The first end of the fourth light emitting unit is electrically connected to the second end of the second light emitting unit, and the second end is electrically connected to the second end of the third light emitting unit. The driving unit drives the first lighting unit, the second lighting unit, the third lighting unit and the fourth lighting unit according to a power signal outputting an AC driving signal. The feedback unit is electrically connected to the first end of the first lighting unit and the second end of the third lighting unit, and outputs one feedback signal of a single polarity. The control unit outputs a control signal to control the driving unit according to the feedback signal.

To achieve the above objective, the present invention provides a method for controlling a light source module, wherein the light source module has a first light emitting unit, a second light emitting unit, a third light emitting unit, a fourth light emitting unit, a driving unit, and a The feedback unit and a control unit. The first end of one of the second light emitting units is electrically connected to the first end of the first light emitting unit. The first end of one of the third lighting units is electrically connected to the second end of one of the first lighting units. The first end of the fourth light emitting unit is electrically connected to the second end of the second light emitting unit, and the second end is electrically connected to the second end of the third light emitting unit. The feedback unit is electrically connected to the first end of the first lighting unit and the second end of the third lighting unit. The control method of the light source module includes the following steps: driving, by the driving unit, an AC driving signal according to a power signal to respectively drive the first lighting unit, the second lighting unit, the third lighting unit, and the fourth lighting unit; and outputting by the feedback unit One of the single polarity feedback signals; and the control unit outputs a control signal to control the driving unit according to the feedback signal.

To achieve the above objective, the present invention provides a light source module including a first light emitting unit, a second light emitting unit, a driving unit, a feedback unit, and a control unit. The first end of one of the second light emitting units is electrically connected to the first end of the first light emitting unit. The driving unit drives the first lighting unit and the second lighting unit according to a power signal outputting an AC driving signal. The feedback unit is electrically connected to the first end of the first lighting unit, the first end of the second lighting unit, and the driving unit, and outputs one feedback signal of a single polarity. The control unit outputs a control signal to control the driving unit according to the feedback signal.

To achieve the above objective, the present invention provides a backlight module including a first light emitting unit, a second light emitting unit, a driving unit, a feedback unit, and a control unit. The first end of one of the second light emitting units is electrically connected to the first end of the first light emitting unit. The driving unit drives the first lighting unit and the second lighting unit according to a power signal outputting an AC driving signal. The feedback unit is electrically connected to the first end of the first lighting unit, the first end of the second lighting unit, and the driving unit, and outputs one feedback signal of a single polarity. The control unit outputs a control signal to control the driving unit according to the feedback signal.

To achieve the above objective, the present invention provides a method for controlling a light source module, wherein the light source module has a first light emitting unit, a second light emitting unit, a driving unit, a feedback unit, and a control unit. The first end of one of the second light emitting units is electrically connected to the first end of the first light emitting unit. The feedback unit is electrically connected to the first end of the first lighting unit, the first end of the second lighting unit, and the driving unit. The control method of the light source module includes the following steps: the driving unit outputs an AC driving signal according to a power signal to respectively drive the first lighting unit and the second lighting unit; and the feedback unit outputs one of the single polarity feedback signals; The control unit outputs a control signal to control the driving unit according to the feedback signal.

According to the present invention, the light source module, the backlight module and the light source module control method are controlled by the circuit connection structure of the plurality of light-emitting units and the conduction characteristics of the light-emitting diodes by the feedback unit. Capture a single polarity feedback signal. The feedback signal captured by the feedback unit is analyzed by the same control unit. Compared with the prior art, the light source module, the backlight module and the control method of the light source module of the present invention can increase the computational burden of the components without occupying an additional space without increasing the number of components.

Hereinafter, a control method of a light source module, a backlight module and a light source module according to a plurality of preferred embodiments of the present invention will be described with reference to related drawings.

First embodiment

As shown in FIG. 1 , the light source module 1 of the first embodiment of the present invention includes a first light emitting unit 11 , a second light emitting unit 12 , a third light emitting unit 13 , a fourth light emitting unit 14 , and a driving unit . The unit 15, a feedback unit 16, and a control unit 17.

The first lighting unit 11 has a first end 11a and a second end 11b. The second lighting unit 12 has a first end 12a and a second end 12b. The third lighting unit 13 has a first end 13a and a first end. The second end 13b has a first end 14a and a second end 14b. The first end 11a of the first illuminating unit 11 is electrically connected to the first end 12a of the second illuminating unit 12, and the second end 11b of the first illuminating unit 11 is connected to the first end 13a of the third illuminating unit 13 Electrical connection. The first end 14a of the fourth illuminating unit 14 is electrically connected to the second end 12b of the second illuminating unit 12, and the second end 14b of the fourth illuminating unit 14 is electrically connected to the second end 13b of the third illuminating unit 13. connection.

In this embodiment, the first light emitting unit 11, the second light emitting unit 12, the third light emitting unit 13, and the fourth light emitting unit 14 respectively have a plurality of light emitting diodes connected in series. Here, the first end 11a of the first lighting unit 11, the first end 12a of the second lighting unit 12, the first end 13a of the third lighting unit 13, and the first end 14a of the fourth lighting unit 14 are correspondingly a negative terminal of one of the light emitting diodes, a second end 11b of the first light emitting unit 11, a second end 12b of the second light emitting unit 12, a second end 13b of the third light emitting unit 13, and a second light emitting unit 14 The terminal 14b is a positive terminal of one of the corresponding light-emitting diodes.

The feedback unit 16 of the present embodiment includes a resistor R ₁ , and one end of the resistor R ₁ is electrically connected to the first end 11 a of the first lighting unit 11 and the first end 12 a of the second lighting unit 12 respectively. the other end of line 13 ₁ are connected to the second end 13b and a second end 14 of the fourth light emitting unit 14b is electrically third light emitting unit. In addition, the control unit 17 is electrically connected to the feedback unit 16 and the driving unit 15, respectively.

As shown in FIG. 1 , the driving unit 15 is respectively connected to the second end 11 b of the first lighting unit 11 , the second end 12 b of the second lighting unit 12 , the first end 13 a of the third lighting unit 13 , and the fourth lighting unit 14 . The first end 14a is electrically connected. The driving unit 15 of this embodiment includes a switching circuit 151 and a boosting circuit 152.

The switching circuit 151 is electrically connected to a power supply unit 18 and a boosting circuit 152, and has switches 153, 154, 155, and 156. The switch 153 is electrically connected to the boosting circuit 152, the switch 154, the switch 155, and the power supply unit 18, respectively. The switch 156 is electrically connected to the boosting circuit 152, the switch 154, the switch 155, and the power supply unit 18, respectively.

The boost circuit 152 has a transformer T ₁ . The input side of the transformer T ₁ is electrically connected to the switching circuit 151 , and the output side thereof is respectively connected to the second end 11 b of the first lighting unit 11 , the second end 12 b of the second lighting unit 12 , and the first end of the third lighting unit 13 . 13a and the first end 14a of the fourth lighting unit 14 are electrically connected.

Hereinafter, the operation mode of the light source module 1 will be described in detail. As shown in FIG. 1, the power supply unit 18 outputs a power signal S ₁₁ and transmits it to the switching circuit 151. In this embodiment, the power signal S ₁₁ can be a DC power signal.

153,154,155,156 switching signal S _11, respectively, according to the power or turned off, the switching circuit 151 outputs a switching signal S _12, and transmits it to the booster circuit 152. At this time, the boosting circuit 152 outputs an AC driving signal S ₁₃ according to the switching signal S ₁₂ .

The AC drive signal S ₁₃ has at least one positive half cycle and at least one negative half cycle. In this embodiment, a sine wave and a negative sine wave are respectively taken as an example. As shown in FIG. 2A, when the AC driving signal S _{13 is} in the positive half cycle, the light emitting diode of the first light emitting unit 11 and the light emitting diode of the fourth light emitting unit 14 are turned on, and the fourth light emitting unit 14 is turned on. the second end 14b of the ground, thus, the drive unit 15, and the first light emitting unit 11 based feedback unit 16 is formed an electrical circuit, and generates a driving current I _1. The fourth lighting unit 14 and the driving unit 15 form an electrical circuit and generate a driving current I ₂ .

At this time, the feedback unit 16 is composed of the first end 11a of the first lighting unit 11, the first end 12a of the second lighting unit 12, the second end 13b of the third lighting unit 13, and the second of the fourth lighting unit 14. The terminal 14b retrieves a feedback signal S ₁₄ , which is a positive feedback signal. In this embodiment, the feedback signal S ₁₄ can be a voltage signal or a current signal. At this time, the control unit 17 outputs a control signal S _{15 to} control the driving unit 15 according to the feedback signal S ₁₄ , and causes the switching circuit 151 to output the switching signal S ₁₂ according to the power signal S ₁₁ and the control signal S ₁₅ , thereby respectively adjusting the driving current I. ₁ and the magnitude of the drive current I ₂ to improve display quality.

As shown in FIG. 2B, when the AC driving signal S _{13 is} in the negative half cycle, the LEDs of the second illumination unit 12 and the LEDs of the third illumination unit 13 are turned on, and the third illumination unit 13 is turned on. the second end 13b is grounded, therefore, the drive unit 15, the second light emitting unit 12, the feedback unit 16 form an electrical circuit lines, and generates a driving current I _3. The second light emitting unit 12 and the driving unit 15 form an electrical circuit and generate a driving current I ₄ .

At this time, the feedback unit 16 is composed of the first end 11a of the first lighting unit 11, the first end 12a of the second lighting unit 12, the second end 13b of the third lighting unit 13, and the second of the fourth lighting unit 14. The terminal 14b retrieves the feedback signal S ₁₄ , which is a positive feedback signal. The control unit 17 outputs the control signal S _{15 to} control the driving unit 15 according to the feedback signal S ₁₄ , and causes the switching circuit 151 to output the switching signal S ₁₂ according to the power signal S ₁₁ and the control signal S ₁₅ , thereby respectively adjusting the driving current I ₃ and the driving current. I ₄ size to improve display quality.

As described above, the feedback unit 16 is the first end 11a of the first lighting unit 11 and the first of the second lighting unit 12, regardless of whether the AC driving signal S ₁₃ outputted by the boosting circuit 152 is in the positive half cycle or the negative half cycle. The feedback signal S ₁₄ captured by the terminal 12a, the second end 13b of the third lighting unit 13, and the second end 14b of the fourth lighting unit 14 is a single polarity feedback signal. Therefore, the light source module 1 of the present embodiment can analyze the feedback signal S ₁₄ by a control unit 17. Compared with the prior art, the light source module 1 of the embodiment does not increase the computational burden of the control unit. There is no need to increase the number of control units to take up extra space. In addition, the light source module 1 of the present embodiment can be applied to a display device. In the display device, the light source module 1 can be a backlight module.

However, in this embodiment, the circuit connection mode of the feedback unit 16 is not limited. It is well known to those skilled in the art that when one end of the resistor R ₁ can be grounded, and the first end 11a and the second end of the first illumination unit 11 The first end 12a of the light emitting unit 12 is electrically connected. The other end of the resistor R ₁ is electrically connected to the second end 13 b of the third lighting unit 13 , the second end 14 b of the fourth lighting unit 14 , and the control unit 17 . In addition, through the above description, it is known to those skilled in the art that the feedback unit 16 can be the first end 11a of the first lighting unit 11, the first end 12a of the second lighting unit 12, and the third lighting unit 13 The second end 13b and the second end 14b of the fourth lighting unit 14 capture the feedback signal S ₁₄ , which is a negative feedback signal.

Referring to FIG. 3, the control method of the light source module according to the first embodiment of the present invention is applied to the light source module of the first embodiment (as shown in FIG. 1). The control method of the present invention includes steps W11 to W13.

In step W11, the driving unit outputs an AC driving signal according to a power signal to respectively drive the first lighting unit, the second lighting unit, the third lighting unit, and the fourth lighting unit. In step W12, the feedback unit outputs one of the single polarity feedback signals. In step W13, the control unit outputs a control signal to control the driving unit according to the feedback signal. The detailed control method has been described in detail in the above embodiments, and thus will not be further described herein.

Second embodiment

As shown in FIG. 4 , the light source module 2 of the second embodiment of the present invention includes a first light emitting unit 21 , a second light emitting unit 22 , a driving unit 25 , a feedback unit 26 , and a control unit 27 .

The first light emitting unit 21 has a first end 21a and a second end 21b. The second light emitting unit 22 has a first end 22a and a second end 22b. The first end 21a of the first light emitting unit 21 is electrically connected to the first end 22a of the second light emitting unit 22.

In this embodiment, the first light emitting unit 21 and the second light emitting unit 22 respectively have a plurality of light emitting diodes connected in series. The first end 21a of the first illuminating unit 21 and the first end 22a of the second illuminating unit 22 are the negative end of one of the corresponding illuminating diodes, and the second end 21b and the second end of the first illuminating unit 21 The second end 22b of the light emitting unit 22 is a positive end of one of the corresponding light emitting diodes.

The feedback unit 26 of the present embodiment includes a resistor R ₂ , and one end of the resistor R ₂ is electrically connected to the first end 21 a of the first lighting unit 21 and the first end 22 a of the second lighting unit 22 respectively. The other end of ₂ is grounded. In addition, the control unit 27 is electrically connected to the feedback unit 26 and the drive unit 25, respectively.

1, the drive unit 25 are respectively connected to the lines 21 21b and a second end of the second light-emitting unit ₂ of the other end 22 of the second electrically end 22b and a resistor R first light emitting unit. The driving unit 25 of this embodiment includes a switching circuit 251 and a boosting circuit 252.

The switching circuit 251 is electrically connected to a power supply unit 28 and a boost circuit 252, and has switches 253, 254, 255, and 256. The switch 253 is electrically connected to the boosting circuit 252, the switch 254, the switch 255, and the power supply unit 28, respectively. The switch 256 is electrically connected to the boosting circuit 252, the switch 254, the switch 255, and the power supply unit 28, respectively.

Booster circuit 252 having a transformer T _2, the transformer T of the embodiment ₂ of the present embodiment may be a center tap of the line transformer. Here, the input side of the transformer T ₂ has a first winding 257 which is electrically connected to the switching circuit 251. The output side of the transformer T ₂ has a second winding 258 having a first end, a second end and a third end. The first end of the second winding 258 is electrically connected to the second end 21b of the first lighting unit 21, and the second end of the second winding 258 is electrically connected to the second end 22b of the second lighting unit 22. The second winding 258 The third end is electrically connected to the other end of the feedback unit 26.

Hereinafter, the operation mode of the light source module 2 will be described in detail. As shown in FIG. 4, the power supply unit 28 outputs a power signal S ₂₁ and transmits it to the switching circuit 251. In this embodiment, the power signal S ₂₁ can be a DC power signal.

The switches 253, 254, 255, and 256 respectively turn on or off according to the power signal S _{21, and} cause the switching circuit 251 to output a switching signal S ₂₂ and transmit it to the boosting circuit 252. At this time, the boosting circuit 252 outputs an AC driving signal S ₂₃ according to the switching signal S ₂₂ .

The AC drive signal S _{23 of} this embodiment has at least one positive half cycle and at least one negative half cycle. In this embodiment, a sine wave and a negative sine wave are respectively taken as an example. Referring to FIG. 5A, when the AC driving signal S _{23 is} in the positive half cycle, since the LEDs of the first lighting unit 21 are turned on, the driving unit 25, the first lighting unit 21, and the feedback unit 26 are An electrical loop is formed and a drive current I ₅ , I _{6 is} generated.

At this time, the feedback unit 26 extracts a feedback signal S _{24 from} the first end 21a of the first lighting unit 21 and the first end 22a of the second lighting unit 22, which is a positive feedback signal.

In this embodiment, the feedback signal S ₂₄ can be a voltage signal or a current signal. At this time, the control unit 27 outputs a control signal S _{25 to} control the driving unit 25 according to the feedback signal S ₂₄ , and causes the switching circuit 251 to output the switching signal S ₂₂ according to the power signal S ₂₁ and the control signal S ₂₅ , thereby respectively adjusting the driving current I. ₅ and drive current I ₆ size to improve display quality.

As shown in FIG. 5B, when the AC driving signal S _{23 is} in the negative half cycle, since the LEDs of the second lighting unit 22 are turned on, the driving unit 25, the second lighting unit 22, and the feedback unit 26 are An electrical loop is formed and a drive current I _{7 is} generated. The second light emitting unit 22 and the driving unit 25 form an electrical circuit and generate a driving current I ₈ .

At this time, the feedback unit 26 receives the feedback signal S _{24 from} the first end 21a of the first lighting unit 21 and the first end 22a of the second lighting unit 22, which is a positive feedback signal. The control unit 27 outputs a control signal S _{25 to} control the driving unit 25 according to the feedback signal S ₂₄ , and causes the switching circuit 251 to output the switching signal S ₂₂ according to the power signal S ₂₁ and the control signal S ₂₅ , thereby respectively adjusting the driving current I ₇ and driving. The current I ₈ is sized to improve display quality.

As described above, the feedback unit 26 is the first end 21a of the first illumination unit 21 and the first illumination unit 22, regardless of whether the AC drive signal S ₂₃ outputted by the booster circuit 252 is in the positive half cycle or the negative half cycle. The feedback signals S ₂₄ captured by the terminal 22a are all single polarity feedback signals.

The light source module 2 of the present embodiment analyzes the feedback signal S ₂₄ by a control unit 27, and the light source module 2 of the embodiment does not increase the computational burden of the control unit, and does not need to be compared with the prior art. Increase the number of control units to take up extra space. In addition, the light source module 2 of the present embodiment can be applied to a display device. In the display device, the light source module 2 can be a backlight module.

However, in this embodiment, the implementation of the transformer T ₂ is not limited. As shown in FIG. 6 , the boosting circuit 29 of the light source module 2 a may have a transformer T ₃ . Here, the input side of the transformer T ₃ has a first winding 291 which is electrically connected to the switching circuit 251. The output side of the transformer T ₃ has a second winding 292 and a third winding 293 electrically connected to each other, wherein the first end of the second winding 292 is electrically connected to the second end 21b of the first lighting unit 21 The second end of the second winding 292 is electrically connected to the first end of the third winding 293 and the feedback unit 26, and the second end of the third winding 293 and the second end 22b of the second lighting unit 22 are electrically connected. Sexual connection.

Referring to FIG. 7, the control method of the light source module according to the second embodiment of the present invention is applied to the light source module of the second embodiment (as shown in FIG. 4). The control method of the present invention includes steps W21 to W23.

In step W21, the driving unit outputs the AC driving signal according to a power signal to drive the first lighting unit and the second lighting unit respectively. In step W22, the feedback unit outputs one of the single polarity feedback signals. In step W23, the control unit outputs a control signal to control the driving unit according to the feedback signal. The detailed control method has been described in detail in the above embodiments, and thus will not be further described herein.

In summary, the light source module, the backlight module and the light source module control method according to the present invention, wherein the light source module has a plurality of light emitting units, and each of the light emitting units has a plurality of light emitting diodes. The circuit connection structure of the plurality of light-emitting units and the conduction characteristics of the light-emitting diodes provided by the present invention enable the feedback unit to be captured by the light-emitting units regardless of whether the AC drive signal output by the drive unit is in the positive half cycle or the negative half cycle The feedback signals are all single-polar (positive or negative) feedback signals. The feedback signal captured by the feedback unit is analyzed by the same control unit. Compared with the prior art, the light source module, the backlight module and the control method of the light source module of the present invention can increase the computational burden of the components without occupying an additional space without increasing the number of components.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1, 2, 2a. . . Light source module

11, 21. . . First lighting unit

11a, 12a, 13a, 14a, 21a, 22a. . . First end

11b, 12b, 13b, 14b, 21b, 22b. . . Second end

12, 22. . . Second lighting unit

13. . . Third lighting unit

14. . . Fourth lighting unit

15,25. . . Drive unit

151, 251. . . Switching loop

152, 252, 29. . . Boost loop

153, 154, 155, 156, 253, 254, 255, 256. . . switch

16, 26. . . Feedback unit

17, 27. . . control unit

18, 28. . . Power supply unit

257, 291. . . First winding

258, 292. . . Second winding

293. . . Third winding

I ₁ , I ₂ , I ₃ , I ₄ , I ₅ , I ₆ , I ₇ , I ₈ . . . Drive current

R ₁ , R ₂ . . . resistance

S ₁₁ , S ₂₁ . . . Power signal

S ₁₂ , S ₂₂ . . . Switching signal

S ₁₃ , S ₂₃ . . . AC drive signal

S ₁₄ , S ₂₄ . . . Feedback signal

S ₁₅ , S ₂₅ . . . Control signal

T ₁ , T ₂ , T ₃ . . . transformer

W11～W13, W21～W23. . . step

1 is a schematic view of a light source module according to a first embodiment of the present invention;

2A to 2B are schematic diagrams showing driving currents of the light source module of FIG. 1;

3 is a flow chart showing the steps of a driving method of a light source module according to a first embodiment of the present invention;

4 is a schematic diagram of a light source module according to a second embodiment of the present invention;

5A to 5B are schematic diagrams showing driving currents of the light source module of FIG. 4;

6 is a side view of an embodiment of a light source module according to a second embodiment of the present invention;

FIG. 7 is a flow chart showing the steps of a driving method of a light source module according to a second embodiment of the present invention.

1. . . Light source module

11. . . First lighting unit

11a, 12a, 13a, 14a. . . First end

12. . . Second lighting unit

11b, 12b, 13b, 14b. . . Second end

13. . . Third lighting unit

14. . . Fourth lighting unit

15. . . Drive unit

151. . . Switching loop

152. . . Boost loop

153, 154, 155, 156. . . switch

16. . . Feedback unit

17. . . control unit

18. . . Power supply unit

R ₁ . . . resistance

S ₁₁ . . . Power signal

S ₁₂ . . . Switching signal

S ₁₃ . . . AC drive signal

S ₁₄ . . . Feedback signal

S ₁₅ . . . Control signal

T ₁ . . . transformer

Claims (37)

A light source module includes: a first light emitting unit; a second light emitting unit, wherein a first end is electrically connected to a first end of the first light emitting unit; and a third light emitting unit has a first end Electrically connecting with a second end of the first light emitting unit; a fourth light emitting unit having a first end electrically connected to the second end of the second light emitting unit, and a second end The second end of the three light-emitting units is electrically connected; the driving unit drives the first light-emitting unit, the second light-emitting unit, the third light-emitting unit and the fourth light-emitting unit according to a power signal outputting an AC driving signal a unit that is electrically connected to the first end of the first lighting unit and the second end of the third lighting unit, and outputs a feedback signal of a single polarity; and a control unit according to the The feedback signal outputs a control signal to control the driving unit; wherein the driving unit comprises: a switching circuit, and outputs a switching signal according to the power signal and the control signal; and a boosting circuit electrically connected to the switching circuit, and According to the switching signal and outputs the AC drive signal. The light source module of claim 1, wherein the first The light emitting unit, the second light emitting unit, the third light emitting unit, and the fourth light emitting unit respectively have a plurality of light emitting diodes connected in series. The light source module of claim 1, wherein the first ends are respectively a negative end, and the second ends are respectively a positive end. The light source module of claim 1, wherein the boosting circuit comprises a transformer. The light source module of claim 1, wherein the feedback signal is a voltage signal or a current signal. The light source module of claim 1, wherein the power signal is a direct current power signal. A light source module includes: a first light emitting unit; a second light emitting unit, wherein a first end is electrically connected to a first end of the first light emitting unit; and a driving unit outputs an alternating current according to a power signal Drive the signal to drive the first light emitting unit and the second light emitting unit respectively; a feedback unit electrically connected to the first end of the first light emitting unit and the first end of the second light emitting unit, and output One of the single polarity feedback signals; and a control unit that outputs a control signal to control the driving unit according to the feedback signal; wherein the feedback unit and the first end of the first lighting unit and the second lighting unit The first end and the driving unit are electrically connected. The light source module of claim 7, wherein the first The light emitting unit and the second light emitting unit respectively have a plurality of light emitting diodes connected in series. The light source module of claim 7, wherein the first ends are respectively a negative end, and the second ends are respectively a positive end. The light source module of claim 7, wherein the driving unit comprises: a switching circuit, and outputs a switching signal according to the power signal and the control signal; and a boosting circuit, and the switching circuit is electrically Connected and outputs the AC drive signal according to the switching signal. The light source module of claim 10, wherein the boosting circuit comprises a transformer. The light source module of claim 11, wherein the transformer is a center tapped transformer. The light source module of claim 11, wherein the input side of the transformer has a first winding electrically connected to the switching circuit. The light source module of claim 13, wherein the output side of the transformer has a second winding having a first end, a second end and a third end, the first end and the first end The second end of the first light-emitting unit is electrically connected to the second end of the second light-emitting unit, and the third end is electrically connected to the feedback unit. The light source module of claim 13, wherein the output side of the transformer has a second winding and a first electrical connection a third winding, the first end of the second winding is electrically connected to the second end of the first lighting unit, the second end of the second winding and the first end of the third winding and the back The unit is electrically connected, and the second end of the third winding is electrically connected to the second end of the second lighting unit. The light source module of claim 7, wherein the feedback signal is a voltage signal or a current signal. The light source module of claim 7, wherein the power signal is a direct current power signal. A backlight module includes: a first light emitting unit; a second light emitting unit, wherein a first end is electrically connected to a first end of the first light emitting unit; and a third light emitting unit has a first end Electrically connecting with a second end of the first light emitting unit; a fourth light emitting unit having a first end electrically connected to the second end of the second light emitting unit, a second end thereof The second end of the third illuminating unit is electrically connected; the driving unit drives the first illuminating unit, the second illuminating unit, the third illuminating unit and the fourth respectively according to a power signal outputting an ac driving signal a light-emitting unit; a feedback unit electrically connected to the first end of the first light-emitting unit and the second end of the third light-emitting unit, and outputting a feedback signal of a single polarity; a control unit, which outputs a control signal to control the driving unit according to the feedback signal; wherein the driving unit comprises: a switching circuit, and outputs a switching signal according to the power signal and the control signal; and a boosting circuit, and the The switching circuit is electrically connected, and outputs the AC driving signal according to the switching signal. The backlight module of claim 18, wherein the first light emitting unit, the second light emitting unit, the third light emitting unit, and the fourth light emitting unit respectively have a plurality of light emitting diodes connected in series. The backlight module of claim 18, wherein the first ends are respectively a negative end, and the second ends are respectively a positive end. The backlight module of claim 18, wherein the boosting circuit comprises a transformer. The backlight module of claim 18, wherein the feedback signal is a voltage signal or a current signal. The backlight module of claim 18, wherein the power signal is a continuous power signal. A backlight module includes: a first light emitting unit; a second light emitting unit, wherein a first end is electrically connected to a first end of the first light emitting unit; and a driving unit outputs an alternating current according to a power signal Drive signal Driving the first light emitting unit and the second light emitting unit respectively; a feedback unit electrically connected to the first end of the first light emitting unit and the first end of the second light emitting unit, and outputting a single polarity a control signal, and a control unit that outputs a control signal to control the driving unit according to the feedback signal; wherein the feedback unit and the first end of the first lighting unit and the first end of the second lighting unit The terminal and the driving unit are electrically connected. The backlight module of claim 24, wherein the first light emitting unit and the second light emitting unit respectively have a plurality of light emitting diodes connected in series. The backlight module of claim 24, wherein the first ends are respectively a negative end, and the second ends are respectively a positive end. The backlight module of claim 24, wherein the driving unit comprises: a switching circuit, and outputs a switching signal according to the power signal and the control signal; and a boosting circuit, and the switching circuit is electrically Connected and outputs the AC drive signal according to the switching signal. The backlight module of claim 27, wherein the boosting circuit comprises a transformer. The backlight module of claim 28, wherein the transformer is a center tapped transformer. The backlight module of claim 28, wherein the input side of the transformer has a first winding electrically connected to the switching circuit. The backlight module of claim 30, wherein the output side of the transformer has a second winding having a first end, a second end and a third end, the first end and the first end The second end of the first light-emitting unit is electrically connected to the second end of the second light-emitting unit, and the third end is electrically connected to the feedback unit. The backlight module of claim 30, wherein the output side of the transformer has a second winding and a third winding electrically connected to each other, and the first end of the second winding and the first illuminating One second end of the unit is electrically connected, and the second end of the second winding is electrically connected to the first end of the third winding and the feedback unit, and the second end of the third winding is connected to the second end The second end of one of the two light emitting units is electrically connected. The backlight module of claim 24, wherein the feedback signal is a voltage signal or a current signal. The backlight module of claim 24, wherein the power signal is a direct current power signal. A light source module control method, the light source module has a first light emitting unit, a second light emitting unit, a driving unit, a feedback unit and a control unit, and the first end of the second light emitting unit The first end of the first illuminating unit is electrically connected to the first end of the first illuminating unit and the first end of the second illuminating unit. The control method includes the following steps: The driving unit respectively drives the first lighting unit and the second lighting unit according to a power signal outputting an AC driving signal; the feedback unit outputs a feedback signal of a single polarity; and the control unit is configured according to the back The control signal outputs a control signal to control the driving unit; wherein the feedback signal is electrically connected to the first end of the first lighting unit, the first end of the second lighting unit, and the driving unit. The control method of claim 35, wherein the feedback signal is a voltage signal or a current signal. The control method of claim 35, wherein the power signal is a continuous power signal.