TW200533999A - Multiple lamps backlight module - Google Patents

Abstract

A multiple lamps backlight module is provided. The multiple lamps backlight module comprises a plurality of first fluorescent lamps, a plurality of second fluorescent lamps, an electric source device, a first return cable, and a second return cable. Wherein each of the first fluorescent lamps has a first source electrode and a first feedback electrode, and each of the second fluorescent lamps has a second electric electrode and a second feedback electrode. In addition, the electric source device provides alternating currents with opposite phase to the first and the second source electrodes respectively. The first return cable is electrically connected between the first feedback electrode and the electric source device, and the second return cable is electrically connected between the second feedback electrode and the electric source device. The multiple lamps backlight module can provide precise feedback and compensation to improve the quality of output light and prevent the arc discharge owing to the high voltage between the return cables.

Description

200533999 V. Description of the invention (1) [The invention to which the invention belongs has a feedback function [the previous technology is indispensable with production machines, notebooks, multi-function machines, digital cameras, and it is indispensable for users to use mobile phones and digital computers to display flow. However, it is worth noting that there are two functions that can be displayed in the LCD module. Its (the surface light source required by light gu can directly provide the source brightness of the technology field with a lower backlight mode) is related to a backlight module, and in particular to a multi-lamp backlight mode, a computer and Due to the display surface provided by Meiying Machine, the display screen is beneficial, developed, table-viewing, and note-taking communication. The screens are all displayed on the LCD surface under the LCD panel. On the electronic surface, more LCD display screens must be obtained by mobile phones, etc. However, the brain and the table through the convenient video camera, the display panel itself provides a sufficient surface, digital phased tools, and act The above-mentioned computer describes the products. In recent years, notebook-type electronic boards (LCDs do not have a backlight module light source, so that the brightness and the machine, all the phones, the display of ^ page display fluorescent, most of the brain and panel: light-emitting (The back is more liquid crystal than the camera. It is more convenient to carry digital photography. The digital screen is the main function of the screen that can be divided into rows. The main purpose of the light panel is that The side plate is an ide plate, and when the direct-type LCD panel is in high demand, the light modules provided by the group are usually divided into a side-type and a direct-type: the backlight module needs a light guide plate) to convert the line light source. The backlight module converted to a liquid crystal panel does not need to be equipped with a light guide plate, and it needs a surface source. Therefore, a direct-type backlight module is usually used when the display is facing the light. At present, the direct-side light source is composed of two methods, one of which is

12611twf.ptd Page 9 200533999 V. Description of the invention (2) The method is formed by multiple cold cathode fluorescent lamp (CCFL) arranged in parallel with each other, and the other method is by Yu Xi The light-polar body (Li ^ ght Emitting Diode) is arranged in an array. ▲ Yi Li ^ Refer to Figure 1 ’which shows a conventional multi-lamp backlight module = Canton. The multi-lamp backlight module 100 includes a plurality of cold-cathode fluorescent lamps. # 电 技术 电源 装置 1 2〇 and a feedback line 1 3 0, wherein the power supply device 1 2 0

u 〇 Send all cold cathode fluorescent tubes 11 〇 to provide the cold cathode fluorescent tube electrical X-connected driving current required. In addition, the power supply device 1 further includes a DC-to-AC voltage converter 1 2 2 and a pulse width modulation 11 (PWM c0ntro1 K, hereinafter referred to as a pWM control chip). 'The DC-to-AC voltage converter 122 in Thunderview can convert the DC power into a power source to input the cold-cathode fluorescent tube 110, and the feedback line 13 is the gate of the electricity in the cold-cathode fluorescent tube 1 The feedback terminal of 10 and the PWM control chip 1 24 control ^ ^ ^ sends a feedback signal to the PWM control chip 124. Therefore, pWM II 1 1 (Γ slice ^ 2 4 can use this feedback signal to detect the cold cathode fluorescent lamp ^ thunder, tube current in real time, and control the DC to AC voltage converter 1 22 for ^ dry out /; The feedback compensation of Γ makes the cold cathode fluorescent lamp 1 1 0 maintain a stable position. Refer to Figure 1. The early cold cathode fluorescent lamp 1 1 0 was driven by the in-phase $ < power supply, but this This driving method will interfere with the LC]) panel production. In addition, when the ridgeline 130 receives external force from the power source, the source is loosened from the class, or an open circuit is formed between the feedback line 130 and,, 120 because of incorrect product assembly, due to the DC-to-AC voltage conversion

200533999 V. Description of the invention (3) The device 1 2 2 has a high potential, which will cause an arc phenomenon of high voltage discharge between the feedback line 130 and the surrounding low-potential components, which will cause the component to burn out. Therefore, in order to improve the above-mentioned shape, in recent years, the positive and negative poles of the cold-cathode fluorescent tube have been configured to reduce the interference during the display and avoid high voltage between the feedback lines. Please refer to FIG. 2, which shows a schematic diagram of another conventional multi-lamp backlight module. The cold cathode fluorescent lamp tube 2 0 can be divided into a plurality of first fluorescent lamp tubes 212 and a plurality of second fluorescent lamp tubes 214 interspersed with each other. The power supply device 2 2 0 outputs positive and negative polarities (phase On the contrary, the AC power source drives the first fluorescent tube 212 and the second fluorescent tube 214 to generate positive and negative tube currents in opposite directions in the first fluorescent tube 212 and the second fluorescent tube 214, respectively. It can effectively reduce the interference phenomenon of the cold cathode fluorescent tube 2 10 during display, and can avoid the generation of high voltage by offsetting the positive and negative currents. Following the above, although the above-mentioned staggered arrangement of the tubes can be effective Reduces interference and avoids high voltage. However, when the number of the first fluorescent tube and the second fluorescent tube are equal, the positive and negative currents output from the feedback terminal of the lamp and motorcycle will offset each other, resulting in total feedback. The current is zero or only the difference between the positive and negative tube currents. In this way, the feedback device: such as a PWM control chip, will not be able to accurately detect or distinguish the actual current value of the tube to adjust the tube current, so Affects the input of backlight modules Uniformity of brightness. In addition, although there is currently a backlight module to provide a feedback line for each light #, corresponding to the feedback compensation action of each lamp, this wiring method is bound to significantly increase the return The number of award lines, thus increasing the cost required for production.

12611twf.ptd Page 11 200533999 V. Description of the invention (4) [In view of the module, it is to feedback and control the present invention to provide a protection image to increase the number of protection paths provided by the present invention, based on the multiple lights One of the backlight lamps of the tube is a light source. The set of the set, the second tube, one, each first round and the phase of the piping system in addition to, and while. Based on the multi-lamp fluorescent lamp, the other circuit of the product can be used for large purposes, and the module power supply is also described in the first. The present invention is a feedback circuit for the purpose of avoiding the reliability of the purpose of the line. Provided is to provide feedback-free and safe-to-provide operating costs to reduce production costs. This example includes multiple devices. Fluorescent tubes, for example, are provided with a number of multi-tube backlights. Can achieve better light output quality of tube current. A multi-lamp backlight module is the arc integrity of the high voltage discharge of the circuit. A multi-lamp backlight module, which is a feedback signal, and reduces the number of feedback lines to produce a first fluorescein. The first feedback line should be one of the two ends that are parallel to each other. The line is reversed, the first and second eyepiece tubes are in the back tube, and each of the first feedback ends alternately flows through the power supply system is an electric fluorescent lamp, and the first plug is configured to be connected to the first multi-tube backlight mode. Group, this light tube, multiple second fluorescent lights, and a second feedback line. The first power supply terminal and the corresponding tube have, for example, a second fluorescent tube and a second fluorescent tube. In addition, the power supply device is a power supply terminal and a second power supply first feedback terminal and a power supply second feedback terminal and a power supply. The present invention further proposes another multi-lamp backlight mode light module including, for example, a plurality of first fluorescent lamps. Light tube, multiple one power supply devices, multiple first feedback lines, and multiple first

12611twf.ptd Page 12 200533999 V. Description of the invention (5) Second feedback line. Each first fluorescent tube has, for example, a first power terminal and a corresponding first feedback terminal, and each second fluorescent tube has, for example, a second power terminal and a corresponding one of the second and second terminals. The feedback side, and the first fluorescent tube and the second fluorescent tube system are parallel to each other and are interspersed with each other. In addition, the power supply device supplies AC power of opposite phases to the first power terminal and the second power terminal, respectively. In addition, the first feedback line is electrically connected between the first feedback end and the power supply device, and every N first fluorescent tube systems are respectively electrically connected to one of the first feedback lines, and The second feedback line is electrically connected between the second feedback end and the power supply device, and each of the second #light tube systems is electrically connected to one of the second feedback lines, respectively, where N ^ 2, M ^ 2 ° In a preferred embodiment of the present invention, the power supply device described above includes, for example, a voltage output unit and a feedback control unit electrically connected to each other, wherein the voltage output unit is connected to the first power terminal and the first The two power supply terminals are electrically connected, and the feedback control unit is electrically connected to the first feedback line and the second feedback line. In addition, the voltage output unit includes, for example, a DC to AC voltage converter (D C-A C i η ν e r t e r), and the feedback control unit includes a pulse width modulation control chip (PWM control 1C), for example. In a preferred embodiment of the present invention, the multi-lamp backlight module described above further includes at least one protection circuit, which is electrically connected between the first feedback line and the second feedback line, and this protection The circuit may be, for example, a comb capacitor or another type of capacitor. In addition, the protection circuit may include, for example, a first resistor, a first diode, a second resistor, and a second diode. The first resistor is electrically connected between the first feedback line and the ground. , The second resistance is electrical

12611twf.ptd Page 13 200533999 V. Description of the invention (6) It is electrically connected between the second feedback line and the ground. The first two-pole system is electrically connected between the first feedback line and the power supply device, and the second The two-pole system is electrically connected between the second feedback line and the power supply device. In addition, the above-mentioned multi-lamp backlight module further includes, for example, a first feedback line, wherein one end of the third feedback line is electrically connected to the first diode and the second diode, and the third feedback The other end of the cable is electrically connected to the power supply device. Based on the above, the multi-lamp backlight module of the present invention divides the fluorescent lamps with the same phase driving voltage into the same group, and uses a feedback line to connect the fluorescent lamps in the same group, or Group fluorescent lamps of the same group " & so that every two or more fluorescent lamps are connected in parallel with a feedback line to detect the tube current of the fluorescent lamps in the group, And the drive voltage feedback and compensation actions. Compared with the conventional method, the multi-lamp backlight module of the present invention can not only greatly save the number of feedback lines to reduce the manufacturing cost, but also accurately detect the tube current of the fluorescent lamp, thereby providing better light output. quality. In addition, in view of a voltage difference between the first feedback line and the second feedback line, the multi-lamp backlight module of the present invention may be further designed with a protection circuit, wherein the protection circuit may be provided by the first feedback One of the comb capacitors formed by the line and part of the second feedback line is composed of a plurality of resistance elements and semiconductor elements. With this protection circuit, when an open circuit is formed between the feedback line and the power supply device, the arc phenomenon of the high-voltage discharge of the feedback line can be avoided, thereby improving the reliability and safety of the product, and the protection circuit can also integrate the feedback Signal to reduce the number of feedback lines to reduce production costs. In order to make the above and other objects, features, and advantages of the present invention clearer

12611twf.ptd Page 14 200533999 V. Description of the invention (7) It is easy to understand. The preferred embodiment will be described in detail below with reference to the accompanying drawings. [Embodiment] Please refer to FIG. 3, which is a schematic diagram of a first multi-lamp backlight module according to a preferred embodiment of the present invention. The multi-lamp backlight module 300 includes, for example, a plurality of first fluorescent lamps 312, a plurality of second fluorescent lamps 314, a power supply device 320, a first feedback line 332, and a second feedback line 334. The first fluorescent tube 312 and the second fluorescent tube 314 are arranged in parallel with each other and interspersed with each other, and the first fluorescent tube 3 1 2 has, for example, a first source terminal 3 1 2 a and a corresponding first A feedback terminal 312b, and the second fluorescent tube 314 has, for example, a second power supply terminal 3 1 4 a and a corresponding second feedback terminal 3 1 4 b. In addition, the power supply device 320 includes, for example, a voltage output unit 322 and a feedback control unit 3 2 4. The voltage output unit is, for example, a DC-to-AC voltage converter, and the feedback control unit is, for example, a PWM control chip. Please refer to FIG. 3 again. The voltage output unit 3 2 2 is electrically connected to the first power terminal 3 1 2 a and the second power terminal 3 1 4 a, respectively, so as to provide AC power of opposite phases to the first fluorescent light. The lamp tube 3 1 2 and the second fluorescent lamp tube 3 1 4. In addition, the first feedback line 3 3 2 and the second feedback line 334 can be formed on, for example, a printed circuit board (not shown), and the _ Zhongdi One Feedback Line 3 3 2 is electrically connected to the first The feedback terminal 3 12b is connected to the feedback control unit 3 24, and the second feedback line 334 is electrically connected between the second feedback terminal 314b and the feedback control unit 324. In addition, the feedback control unit 3 24 is adapted to detect the first fluorescent tube 3 1 2 and the second fluorescent tube through the first feedback line 3 3 2 and the second feedback line 3 3 4. The feedback current of 3 1 4 corresponds to the output voltage of the control voltage output unit 322

12611twf.ptd Page 15 200533999 V. Description of the invention (8) value, so that the first fluorescent tube 312 and the second fluorescent tube 314 maintain stable light emission brightness. Following the above, the corresponding sections of the first feedback line 3 3, 2 and the second feedback line 3 3 4 form a clear protection circuit, such as a comb capacitor 3 4 0, which is used to buffer the first loop The voltage at the time of the open circuit is formed between the line 3 3 2 and the second feedback line 3 3 4 and the power supply device 3 2 0 to avoid the arc phenomenon of high voltage discharge. Wherein, when the multi-lamp backlight module 300 is in a normal state, the first feedback line 3 3 2 and the second feedback line 3 3 4 are respectively connected to the power supply device 3 2 0. At this time, the first The electrical difference between the feedback line 3 3 2 and the second feedback line 3 3 4 is zero, and no current is generated in the comb capacitor 3 4 0. However, when the multi-lamp backlight module 3 00 is in an abnormal state, that is, the first feedback line 3 3 2 or the second feedback line 3 3 4 is released from the power supply device 3 2 0 due to external force, or due to When the assembly on the production line is inaccurate and an open circuit is formed between the first feedback line 3 3 2 or the second feedback line 3 34 and the power supply device 3 2 0, the comb capacitor 3 4 0 converts the voltage into a current. Prevent the generation of south voltage. In addition, the above-mentioned first feedback line 3 3 2 and the second feedback line 3 34 may be arranged on the same surface or different surfaces of the printed circuit board. For example, the first feedback line 3 3 2 and the second feedback line 3 3 4 may be respectively disposed on the front surface and the back surface of a printed circuit board, and they may form a plurality of combs in corresponding areas, for example. Structure to form a plurality of comb capacitors. It is worth noting that when the overlapping area of the comb structure of the first feedback line 3 3 2 and the second feedback line 3 3 4 is larger or the relative distance is smaller, the capacitance of the comb peptide capacitor will be larger. It is worth mentioning that the protection circuit of the present invention can also be, for example, a flat capacitor or another type of capacitor, and the voltage output unit and feedback control in the power supply device

12611twf.ptd Page 16 200533999 V. Description of the invention (9) The type of manufacturing unit can also be changed according to actual needs. In addition to the comb capacitor described above, the present invention can also arrange other types of electronic components on the printed circuit board as a protection circuit, and can provide other Θ energy such as signal processing. Please refer to FIG. 4, which illustrates a schematic diagram of a multi-lamp backlight module with another protection circuit according to the present invention. As shown in FIG. 4, the first feedback line 3 3 2 is electrically connected to one end of a first resistance 3 5 2, and the other end of the first resistance 3 5 2 is grounded, and the second feedback line 3 3 The 4 series is electrically connected to one end of a second resistor 354, and the other end of the second resistor 354 is grounded. In addition, the first feedback line 3 3 2 and the second feedback line 3 3 4 are electrically connected to the anodes of the first diode 3 5 6 and the second diode 3 5 8 respectively, in which the first diode The body 3 5 6 and the second diode 3 5 8 are used as filter elements to integrate the feedback signals of the first feedback line 332 and the second feedback line 334 into a single feedback signal. The third feedback line 360 is transmitted to the feedback control unit 3 2 4. In this way, not only can the arc phenomenon caused by high voltage be avoided, but also the feedback of the original two signals is reduced to one, thereby reducing the number of required feedback lines. Please refer to FIG. 5, which illustrates a schematic diagram of a second multi-lamp backlight module according to a preferred embodiment of the present invention. The multi-lamp backlight module 4 0 0 includes, for example, a plurality of first fluorescent lamps 412, a plurality of remote fluorescent lamps 414, a power supply device 4 2 0, a plurality of first feedback lines 4 3 2 and multiple Second feedback line 434. Among them, the DC-to-AC voltage converter 4 2 2 in the power supply device 4 2 0 drives the first #light tube 4 1 2 and the second fluorescent tube 414 with AC power of opposite phases, respectively, and the first fluorescent light tube The lamp tube 412 and the second fluorescent lamp tube 414 are alternately arranged in groups of two. In addition, each group (two) of the first fluorescent

12611twf.ptd Page 17 200533999 V. Description of the Invention (ίο) The first feedback end 4 12b of the lamp tube 412 is connected in parallel with a first feedback line 4 3 2 and each group (two) of the second fluorescent light The second feedback end 414b of the lamp tube 412 is connected in parallel with a second feedback line 4 34, and the PWM and control chip 4 24 are connected by multiple first feedback lines 432 and multiple second feedback lines 4 3 4 detects the tube currents of the first fluorescent tube 41 2 and the second fluorescent tube 4 1 4 to perform the feedback compensation action. According to the above, the multi-lamp backlight module of the present invention uses a feedback line to connect fluorescent lamps of the same polarity, or connects two or more fluorescent lamps of the same polarity to one feedback. Line to detect the tube current of the fluorescent tube and perform the feedback and compensation of the driving voltage. γCompared to the first multi-lamp backlight module of the present invention, the second multi-lamp backlight module of the present invention is a group of fluorescent lamps for feedback, so more accurate management can be performed. Current detection to get better feedback compensation effect. Of course, in addition to the above-mentioned two fluorescent tubes connected in parallel for detection, the multi-lamp backlight module of the present invention can further change the fluorescent tubes and connect them back according to the manufacturing cost, output quality requirements, or other factors. The number of award lines to get an optimized design. In addition, the second multi-lamp backlight module of the present invention may also have the protection circuit as described above. For example, the multi-lamp backlight module may be equipped with a multi-layer circuit board formed with a plurality of feedback lines. A protection circuit is formed on the line layer, but its related components are similar to the above-mentioned embodiment, and details are not repeated here. In summary, the multi-lamp backlight module of the present invention separately feedbacks fluorescent lamps of different polarities, thus avoiding the problem of the offset of the positive and negative tube currents, and with each conventional fluorescent lamp. Compared with the backlight module using a feedback line, the multi-lamp backlight module of the present invention can greatly save

12611twf.ptd Page 18 200533999 V. Description of the invention (11) The number of feedback lines can reduce production costs. In addition, the feedback line of the present invention has a design of a protection circuit, which is used to avoid the electric and arc phenomenon of high voltage discharge when an open circuit is formed between the feedback line and the power supply device, and the feedback signal can be integrated to reduce The number of wires needed to be handed down reduces costs. The multi-lamp backlight module of the present invention can not only accurately detect the tube current of the fluorescent lamp, provide better light output quality, but also ensure the reliability and safety of the product, and effectively enhance the competitiveness of the product. Although the present invention has been disclosed in the preferred embodiment as above, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the invention. The scope of protection of the invention shall be determined by the scope of the attached patent application.

12611twf.ptd Page 19 200533999 Brief Description of Drawings Figure 1 shows a schematic diagram of a conventional multi-lamp backlight module. Fig. 2 is a schematic diagram showing another conventional multi-lamp backlight module. FIG. 3 is a schematic diagram of the first multi-lamp backlight module of the preferred embodiment of the present invention. FIG. 4 is a schematic diagram of a multi-lamp backlight module with another protection circuit according to the present invention. FIG. 5 is a schematic diagram of a second multi-lamp backlight module according to a preferred embodiment of the present invention. > v '[Schematic description] 1 0 0: Multi-lamp backlight module · 110: Cold cathode fluorescent lamp' 1 2 0: Power supply unit 1 2 2: DC to AC voltage converter 1 24: PWM Control chip 1 3 0: feedback line 2 1 0: cold cathode fluorescent tube 2 1 2: first fluorescent tube 2 1 4: second fluorescent tube 2 2 0: power supply device 3 0 0: multiple Lamp backlight module 31 2: first fluorescent lamp 'k 3 1 2 a: first power terminal 312 b: first feedback terminal

12611twf.ptd Page 20 200533999 Simple illustration of the diagram 314: The second fluorescent tube 3 1 4a: The second power terminal 314b: The second feedback terminal

320 power supply unit 322 voltage output X3XJ — early Wu 324 feedback control tro — early Wu 332 first feedback line 334 second feedback line 340 comb capacitor 400 multi-lamp backlight module 412 first fluorescent lamp 412b: The first-feedback terminal 414b • Zhe-Shenle one or two feedback terminal 414 second fluorescent tube 420 power supply device 422 DC to AC voltage converter 424 PWM control chip 432 first _ feedback line 434 feedback line 12611twf.ptd Page 21

Claims (1)

200533999 VI. Scope of patent application1. A multi-lamp backlight module includes: a plurality of first fluorescent lamps, each of which has a first power terminal and a corresponding one of the first, Feedback terminal; a plurality of second fluorescent tubes, each of the second fluorescent tubes has a second power terminal and a corresponding second feedback terminal, wherein the first fluorescent tubes and the second fluorescent tube The second fluorescent tubes are parallel to each other and are interspersed with each other; a power supply device that provides alternating-phase AC power to the first power terminals and the second power terminals respectively; a first circuit The power transmission line is electrically connected between the first return terminals and the power supply device; and a second power transmission line is electrically connected between the second feedback ends and the power supply device. 2. The multi-lamp backlight module according to item 1 of the scope of patent application, wherein the power supply device includes a voltage output unit and a feedback control unit electrically connected to each other, wherein the voltage output unit is connected to the first A power terminal and the second power terminals are electrically connected, and the feedback control unit is electrically connected to the first feedback line and the second feedback line. 3. The multi-lamp backlight module according to item 2 of the scope of patent application, wherein the voltage output unit includes a direct current: to AC voltage converter (DC-AC inverter) ° 4. As described in item 2 of the scope of patent application The multi-lamp backlight module, wherein the feedback control unit includes a pulse width modulation control chip (PWM c ο ntr ο 1 IC). 5. The multi-lamp backlight module described in item 1 of the scope of patent application, more 12611twf.ptd Page 22 200533999 6. The scope of patent application includes a protection circuit, and the protection circuit is electrically connected between the first feedback line and the second feedback line. 6. The multi-lamp backlight module described in item 5 of the patent application scope, wherein the protection circuit is a comb capacitor. 7. The multi-lamp backlight module according to item 5 of the scope of patent application, wherein the protection circuit includes: a first resistor electrically connected between the first feedback line and ground; a first two pole Body, electrically connected between the first feedback line and the power supply device; a second resistor, electrically connected between the second feedback line and ground; and a second diode, electrically connected Between the second feedback line and the power supply device. 8. The multi-lamp backlight module described in item 7 of the scope of patent application, further comprising a third feedback line, wherein one end of the third feedback line is electrically connected to the first diode and the The second diode, and the other end of the third feedback line is electrically connected to the power supply device. 9. A multi-lamp backlight module, comprising: a plurality of first fluorescent lamps, each of which has a first power terminal and a corresponding first feedback terminal; Second fluorescent tubes, each of the second fluorescent tubes has a second power terminal and a corresponding second Θ terminal, wherein the first fluorescent tubes and the second fluorescent lamps The piping systems are parallel to each other and are interspersed with each other; a power supply device, which provides alternating currents of opposite phases, respectively 12611twf.ptd Page 23 200533999 VI. Patent application power supply to the first power supply terminals and the second power supply terminals; most of the first feedback lines are electrically connected to the first feedback terminals and the power supply Between the devices, each Nth τ * fluorescent tube is connected to one of the first feedback lines correspondingly, and N ^ 2; and the plurality of second feedback lines are electrically connected to Between the second feedback ends and the power supply device, each M second fluorescent tube system is correspondingly electrically connected to one of the second feedback lines, and M ^ 2. 10. The multi-lamp backlight module according to item 9 of the scope of the patent application, wherein the power supply device includes a voltage output unit and a feedback control unit electrically connected to each other, and the voltage output unit is connected with The first power terminals and the second power terminals are electrically connected, and the feedback control unit is electrically connected to the first feedback lines and the second feedback lines. 1 1. The multi-lamp backlight module as described in item 10 of the scope of patent application, wherein the voltage output unit includes a DC-AC inverter ° 1 2. The multi-lamp backlight module according to item 1, wherein the feedback control unit includes a PWM control chip (PWM control 1C) 〇1 3. The multi-lamp backlight module according to item 9 in the scope of patent application It further includes at least one protection circuit, and the protection circuit is electrically connected between one of the first feedback line and one of the second feedback line. . 14. The multi-lamp backlight module as described in item 13 of the scope of patent application, wherein the protection circuit is a comb capacitor. 1 5. The multi-lamp backlight module described in item 13 of the scope of patent application, 12611twf.ptd Page 24 200533999 6. The scope of the patent application, where the protection circuit includes: a first resistor electrically connected between one of the first feedback lines and the ground; a first diode, t-connected between one of the first feedback line and the power supply device; a second resistor electrically connected between one of the second feedback line and ground; and a second diode Is electrically connected between one of the second feedback lines and the power supply device. ^ 1 6. The multi-lamp backlight module according to item 15 of the scope of patent application, further comprising a third feedback line, wherein one end of the third feedback line is electrically connected to the first diode. Body and the second diode, and the other end of the third feedback line is electrically connected to the power supply device. 12611twf.ptd Page 25