TWI345741B - Circuit and method for driving backlight module - Google Patents

Description

1345741 19472twf.doc/e IX. Description of the Invention: [Technical Field] The present invention relates to a driving circuit for a backlight module, and more particularly to driving different color lights in a backlight module in different time intervals. The driving circuit of the light source. [Prior Art] With the development of the industry, the display screen is a digital phone such as a m〇bile phone, a digital camera, a digital vide camera, or a notebook. Or lack of human-machine communication interface. And liquid crystal displays have become the mainstream of display screens. Since the liquid crystal display panel of the liquid crystal display itself does not have the function of emitting light, it is necessary to provide a backlight module to provide a sufficient light source for the liquid crystal display panel to achieve the display function. At present, backlight modules are more commonly used in direct-type backlight modules and side-lit backlight modules. The light source used in the backlight module can be further divided into a C阴极id Cathode Fluorescence Lamp (CCFL) and a Light Emitting Diode (LED). FIG. 1 is a block diagram showing a driving circuit of a conventional backlight module. Referring to FIG. 1, in a driving circuit 100 of a conventional backlight module 120, a pulse width modulation (PWM) unit 102 is generally disposed, and control units 104, 106, and 108 are disposed. Where the 'pulse width modulation unit 1〇2 is used to generate a pulse width modulation signal

Vpwml, Vpwm2 and Vpwm3 are given to control units 1〇4, 106 and 108. The control units 104, 1〇6 and 108 are respectively based on the pulse width modulation signal 1345741 19472twf.doc/e

Vpwml 'Vpwm2 and Vpwm3' to drive the red light source group 122 in the backlight module 120 'the green light source group 124 and the blue light source group and 126, wherein the red light source group 122 is composed of a plurality of red The light emitting diodes 132 are composed of a series connection. In contrast, the green light source group 124 is composed of a plurality of green light emitting diodes 134 connected in series, and the blue light source group 126 is composed of a plurality of blue light emitting diodes 136 connected in series. SUMMARY OF THE INVENTION The present invention provides a driving circuit for a backlight module, which can drive a light source in a backlight module with fewer control units. The invention also provides a driving method of a backlight module, which can use less control unit to drive the illumination source in the backlight module. The driving of the backlight module provided by the invention can (4) drive the back, the module towel has a plurality of illumination sources, and the driving circuit of the invention comprises a control unit, which can generate the driving signal according to the pulse width modulation signal. . In addition, the present invention also includes a first switch and a second switch. The first open, in the first time interval, will be driven in the second time interval by the -first control signal to drive the light source group of the light source source in the first time interval. In contrast, the second switch is based on a second control unit number, and the driving signal is passed to the second illumination source group in the illumination source in the time interval. 'The first time zone groups help each other. The present invention provides a backlight module driving 1345741 19472twf.doc/e method, including driving a first light source in a light source during a first time interval. The group emits light and drives the two illumination source groups in the illumination source to emit light during the second time interval. The first time interval and the second time interval do not overlap each other, and the first illumination source group and the second illumination source group are independent of each other. Moreover, the present invention further includes driving a second group of illumination sources in the illumination source for illumination in a third time interval. The first time interval, the second time interval, and the third time interval do not overlap each other, and the third illumination source group and the first-light source group and the second illumination source group are independent of each other. The invention further provides a driving circuit for the backlight module, comprising a first pressing unit, which can generate a first driving number according to the -first-pulse width modulation signal. Additionally, the present invention also includes a first switch and a second switch. The first switch is configured to conduct the first driving signal to the backlight module in the first time interval according to the first-control signal, so as to drive the first-light source group in the illumination source in the first time interval. According to the second control, the first driving signal is turned on to the backlight mode and the 在 in the second time interval to drive the first group of the illuminating sources in the second time interval, and the first time interval and the second time The second aspect of the present invention may further include a second control unit, which may be configured to generate a second driving signal according to the second pulse width modulation signal to drive the transmission and the source. The second illumination source group, and the first illumination source group, the second illumination source group, and the third illumination source group are independent of each other. / Another point of view, the present invention provides a backlight module driving, comprising driving a first illumination 7 19472 twf.doc / e = and 2 2 ! two time intervals in the illumination source in a first time interval The second of the internal driving illumination sources, the second time period, and the second time interval do not overlap each other. Three illumination source groups. Wherein, the first ^1 ^ ^ 一-element interval in the illuminating source at least partially overlaps at least one of the first time two, seven-two interval, and the first erected two, 'and the brother- illuminating source group The group and the third group of illumination sources are controlled independently of each other. The driving circuit of the other backlight module is invented to include an i first = "di-switch and a second switch. The first switch, i is in - The first light source optical module generates the light source optical module to drive the signal in the first time interval, and the first: second and second switches are based on the second control to the first -M ° ° a1 (4) Hexun is connected to the backlight module, and the other is the second group of illumination sources in the two sources. The special tribute to the re-delivery module is based on the actual pass == and f. The operating current of the group is generated-returned, and: 4 the processing unit 70 can adjust the operating current of the first two-source group according to the feedback signal. In the implementation of the present invention and the second time interval, the two do not overlap each other. And the first illumination source group and the second illumination source group are independent of each other. 2-point of view, this The invention provides a first light source group light in a driving light source in a driving interval between the driving backlights of the backlight module=group S;:: a second hair/a in the second zone moving light source, and a first inter-turn interval And the second time interval is not mutually 1345741 19472twf.doc / e = stack ^ "the light source group and the second light source group mutually mutually = send group according to the actual through the first light source group and group and the second Illumination two adjustment first-issue source Since this correction separately drives different source groups in different time intervals, the present invention _ enables less control elements to drive ^^, 'and can Effectively reduce the components of the driver circuit

The above and other objects, features and advantages of the present invention will become more apparent.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the preferred embodiments will be described in detail with reference to the accompanying drawings. 'D Embodiment' Figure 2 is a block diagram showing a driving circuit of a backlight module in accordance with a first embodiment of the present invention. Referring to FIG. 2, the driving circuit 200 provided by the present invention includes a control unit 2〇2, which generates a driving signal Ic according to a pulse width modulation signal Vpwm, and sends it to the backlight through the switching module 2 Module 240. The switch module 210 is composed of at least two switches. In the present embodiment, the switch module 210 includes switches 212, 214, and 216. In the preferred case, switches 212, 214 and 216 can be implemented using a transistor. Taking the switch 212 as an example, the first source/汲 terminal is coupled to the control unit 2 (10) to receive the driving signal Ic, the gate terminal thereof receives the control signal SW1, and the second source/no terminal is connected to the backlight module 240. First illumination source group 242. Therefore, the switch 212 determines whether to drive the drive % 9 1345741 19472 twf.d 〇 c / e 1c to the backlight module 240 to drive the first illumination source group 242 according to the control signal; Similarly, the switch 214 determines whether to turn on the driving signal Ic to the backlight module 240 according to the control signal SW2 to drive the second lighting source group 244, and the switch 216 determines whether to turn on the driving signal Ic according to the control signal SW3. The backlight module 240 is driven to drive the third illumination source group 246. In this embodiment, the first illumination source group 242 may be composed of a plurality of red light emitting diodes 252 connected in series. In addition, the second illumination source group 244 may be composed of a plurality of green light emitting diodes 254 connected in series, and the third light source group 246 may be composed of a plurality of blue light emitting diodes 256 connected in series. The first illumination source group 242, the second illumination source group 244, and the third illumination source group 246 are respectively independently coupled to the corresponding control elements of the switch module 21A. Generally, a pulse width modulation (PWM) unit 204 is also disposed in the driving circuit 200 for generating a pulse width modulation signal vpwm to the control unit 202, and generating control signals SW1, SW2, and SW3, respectively. Switches 212, 214 and 216. FIG. 3A is a timing diagram of the control signal and the driving signal of FIG. 2. Referring to FIG. 2 and FIG. 3A together, it is assumed that the total cycle time is τ, and in the time interval T1, the control signal SW1 is enabled and the control signals SW2 and SW3 are disabled. At this time, the switch 212 is turned on, and the switches 214 and 216 are turned off. In the same time interval, the drive signal Ic is also enabled. Thereby, the driving circuit 2 can drive the first light source group 242 to emit light in the time interval T1. During the time interval T2, the control signal SW2 will transition to the enable state 1345741 19472twf.doc/e state, while the control signals SW1 and SW3 are disabled. At this point, switch 214 will turn "on" and switches 212 and 216 will be closed. Similarly, the 'drive signal Ic' is also enabled in the time interval T2, so that the drive circuit 200 can drive the second illumination source group 244 to emit light during the time interval T2. Switching to control signal SW3 is enabled during time interval T3, while control signals SW1 and SW2 are disabled, causing switch 216 to be turned "on" and switches 212 and 214 to be turned "off". Similarly, the drive signal jc is enabled at this time, so that the drive circuit 200 can drive the third illumination source group 246 to emit light within the time interval T3. Among them, the length of the time interval D2 and T3 is dynamically determined according to the data to be displayed; the length of the time interval can be fixed, and different driving signals are used in different time intervals. The driving signal Ic is turned on according to the information to be displayed, and FIG. 3B is the timing chart of the other control signal and the driving signal of FIG. In the present embodiment, however, there is no significant overlap between the time intervals T1, D2 and T3. ... Because the human eye has a visual residual phenomenon, when the driving circuit 200 switches the speed of different light source groups in the backlight module 240 fast enough (greater than 60 Hz), the human eye will not feel the flicker phenomenon. In addition, when the speed of the switch is enough, the human eye automatically divides the color light emitted by the three different light source groups. Thereby, the present invention can achieve the effect achieved by the conventional light-emitting module by using less hardware (only requiring - control unit). The edge is not a block diagram of a backlight module according to the second embodiment of the present invention. Referring to FIG. 4, the drive 11 1345741 19472twf.doc/e circuit 400 and the first implementation provided in this embodiment are provided. The difference in the example is that in the switch module 4 〇, four switches are arranged, which are respectively switches 412, 414, 416 and 418. These four switches are respectively based on the control signals SW, SW2, SW3 and SW4, and The driving signal Ic is sent to the backlight module 440 in different time intervals to drive the first light source group 442, the second light source group 444, and the third light source group in four different time intervals. 446 and the fourth light source group 448. The detailed working principle can be referred to the description of the first embodiment. In this embodiment, the first light source group is composed of a plurality of red light emitting diodes 452 connected in series with each other. The fourth light source group is composed of a plurality of light-emitting diodes 458 connected in series with each other. More specifically, the second light source group 444 and the third light source group 446 are both green light. The light-emitting diodes 454 and 456 are formed in series with each other. 5 is a block diagram of a driving circuit of a backlight module according to a third embodiment of the present invention. Referring to FIG. 5, in the embodiment, the driving 'electric f_500 may also include a control unit 502, which may be based on a pulse. The wide modulation unit 504 generates the pulse width modulation signal Vpwml to output the driving signal Icl, and drives the backlight module 54〇 through the switch module 51. The switch module 510 includes switches 512 and 514, respectively, according to the control unit. No. SW1 and SW2, and decide whether to drive the driving signal 1 (^ to the first illumination source group 542 and the second illumination source group 544. In particular, in the driving circuit 5, another control unit is also configured. 506. Similarly, the control unit 506 outputs the driving signal Ic2 according to the pulse width modulation signal Vpwm2 generated by the pulse width modulation unit 504. In this embodiment, the control unit 5〇6 transmits the driving signal Ic2. The third illumination source group 546 in the backlight module 540. 12 1345741 19472twf.doc/e FIG. 6 is a timing diagram of the control signal and the driving signal of FIG. 5. Please refer to FIG. 5 and FIG. The period width is T, while in the time zone In the interval T1, the control signal SW1 is enabled and the control signal SW2 is disabled. The switch 512 is turned on, and the switch 514 is turned off. At this time, the driving signal Icl is also enabled in the time interval T1. Therefore, the driving circuit 500 can drive the first light source group 542 to emit light in the time interval T1.

During time interval T2, control signal SW1 is in turn disabled, and turn control signal SW2 is enabled, causing switch 512 to turn off and switch 514 to turn "on". Similarly, the drive signal Icl is also enabled in the time interval T2, so the drive circuit 500 can drive the second illumination source group 544 to emit light in the time interval Τ2. Χ ’, ^ Since the driving signal Ic2 is enabled in the entire period ,, the third light source group 546 is driven to emit light regardless of the time interval D1 or the time interval D2. Therefore, when the driving circuit 5 switches the first light source group 542 to the second light source group 544 to emit light = faster (greater than 60 Hz), the light source generated by the backlight module 54 is visible to the human eye. It will be a white light source. FIG. 7 is a block diagram showing a backlight module=moving circuit according to a fourth embodiment of the present invention. Referring to FIG. 7, the drive circuit 700 provided in this embodiment is a modified drive circuit lion provided by the third embodiment. In the driving circuit 7〇〇, a switch ^^ θ switch 516 is arranged, which determines whether to drive the driving signal IC2 to 5^^^ according to the control signal SW3, and the like to the Wu group 540. The light source 546 is driven to drive the second light source group 546. 13 1345741 19472twf.doc/e FIG. 8 is a timing diagram of the control signal and the driving signal of FIG. 7. Please refer to FIG. 7 and FIG. 8 together, wherein the descriptions of the control signals swi and SW2, and the driving signal Icl can be referred to the related description of FIG. 6. In addition, the control signal SW3 is enabled during the time interval T3, causing the switch 516 to be turned on. At this time, the drive signal Ic2 is also enabled in the time interval Τ3. Thereby, the drive circuit 700 can drive the third illumination source group 546 to emit light in the time interval Τ3. Since one part of the time interval Τ3 overlaps with the time interval Τ1, the other part is overlapped with the time interval Τ2. Therefore, as long as the driving circuit 700 switches the first illumination source group 542 and the second illumination source group 544 to emit light at a fast enough speed (greater than 60 Hz), the light source generated by the backlight module 540 is white from the human eye. Light source. FIG. 9 is a block diagram of a driving circuit of a backlight module according to a fifth embodiment of the present invention. Referring to FIG. 9 , the driving power 900 provided in this embodiment also includes a control unit 9〇2, which is rotated according to, for example, the pulse width modulation signal Vpwm generated by the pulse width modulation unit 904. Signal Ic. More specifically, the driving circuit 900 is further provided with a voltage adjusting module 906, which receives the driving signal ic, and then adjusts its level, and then generates the driving signal Ic to the switch module 910. The switch module 910 is composed of at least two switches. In the embodiment, the switch module 910 is composed of switches 912, 914 and 916, which respectively drive the signals according to the control signals SW1, SW2 and SW3. Ic, sent to the backlight module 940' to respectively drive the first illumination source group 942, the 14th 1741741 19472twf.doc / e two illumination source group 944 and the third illumination source group 946 ^ detailed, may refer to the above Description of the first embodiment. Driver In the above embodiments, each group of illumination sources can be connected in series by a plurality of LEDs. That is to say, in each group of illumination sources, the cathode ends of each of the LEDs are coupled. Connect to the next LED pole extreme. Wherein the anode end of the first light-emitting H body corresponds to the off, and the cathode end of the last light-emitting diode passes through a resistor, in this embodiment, the first-light source group 942, the second The ends of the last light-emitting diodes of the light source group 944 and the third light source group 946 are grounded through resistors 962, 964, and 966, respectively. In addition, 'the drive circuit 900 is also provided with a feedback module 97A for detecting the passage through the first illumination source group 942, the second illumination source group 944, and the third illumination source group. The operating current of 946 is generated and the control signal Fb is generated to the control unit 902. The control unit 9〇2 can adjust the operating current of each light source group according to the feedback signal Fb. In the present embodiment, the feedback module 97A may include diodes 972, 974, and 976. The anode end surface of the diode 972 is connected to a node of the resistor _ coupled to the last one of the second group 942 to detect the operating current of the first illuminant source group 942. In contrast, the anode end of the diode 974 is connected to the node of the electric & %4 and the second illumination source group 944, and the anode end of the diode 976 is _ to The resistor 966 is coupled to the last illuminator-pole of the third illuminant group 946 to separately measure the servant current of the second illuminant group 944 and the third illuminating group 946. The cathode ends of the diodes 972, 15 1345741 19472 twf.doc/e 974 and 976 are coupled to the control unit 902 to send the feedback signal Fb to the control unit 902. When the control unit 902 receives the feedback signal Fb, the first illumination source group 942 'the second illumination source group 946 and the third illumination source may be respectively adjusted by changing the resistance values of the resistors 962, 964, and 966. The operating current of group 966. In addition, the control unit 902 can also adjust the operating current of each of the light source groups by controlling the level of the driving signal Ic outputted by the voltage adjusting module 906. _ Figure 10 is a timing diagram of the control signal and the driving signal of Figure 9. Referring to FIG. 9 and FIG. 1 together, as described in the previous embodiments, it is assumed that the total period is T, and the control signal ic' and the control signal SW1 are deactivated in the time interval T1, and the 'Ic' will be The image is transmitted to the backlight module 94A to drive the first light source group 942 to emit light in the time interval T1. At this time, the level of the driving voltage Ic, - is 11. Λ Within the time interval Τ2, the control signal SW2 and the drive signal Ic are caused to be b, so the first illumination source group 944 is driven to emit light during the time interval T2. At this time, the level of the driving voltage Ic is 12. In contrast, due to the control, the signal SW3 and the driving voltage Ic are enabled within the time interval, causing the third illumination source group 946 to be driven to emit light during the time interval Τ3. At this time, the level of 'driving Ic' is 13. As can be seen from the above, since the levels of the driving voltage Ic are not the same at different times, the operating current of the mother-light source group can be adjusted. Figure 11 is a circuit diagram showing a driving circuit of a backlight module in accordance with a sixth embodiment of the present invention. Referring to Figure n, the driver circuit is said to be driven by Wei 1 (8), which also has a feedback power of 1170. In the feedback circuit 117, three diodes are also included, which are 1172, 174 and 1176. In this embodiment, the anode ends of the diodes 1172, 1174, and 1176 receive the first illumination source group 1142, the second payment group 1144, and the third illumination source group 1146 of the backlight module 114A, respectively. The operating current, and the diodes 1172, 1174 and 1176, will send the detected operating current from the cathode terminal to the control unit 11〇2. In particular, in the feedback module 117, switches 1182, 1184, and 1186 are also disposed. All three switches can be implemented using a transistor. The first source/turner terminals of the switches 1182, 1184, and 1186 are coupled to the control voltages Vrb and Vr3, respectively, and the gate terminals respectively receive the control signals Swbs SW2 and SW3 generated by the pulse width modulation unit 1104. The second source/汲 terminal is coupled to the control unit 1102. The control unit 1102 has a comparator 1192 having two inputs, one of which is connected to the cathode terminals of the diodes 1172, 1174 and 1176. The other input of the comparator 1192 is coupled to the reference voltages vrl, Vr2, and Vr3 through switches Π82, 1184, and 1186, respectively. Therefore, the control unit 1102 can control the electric waste adjustment module 1106 to generate the driving signals Ic of different levels according to the comparison result of the comparator 1192, and further adjust the second illumination source module of the first illumination source module 1142'. The operating current of the group 1144 and the third illumination source module 1146. Figure 12A is a circuit diagram of a voltage adjustment module in accordance with an embodiment of the present invention. Referring to FIG. 12A, the voltage adjustment module 1200 has an NMOS transistor 1202, the first source/turner terminal is grounded, and the gate terminal is connected to the driving signal Ic generated by the above control units, and the gate terminal thereof is connected to the circuit 1c. The second source/汲 terminal is coupled to the voltage source Vcc through an inductor 1204. In addition, the anode terminal of the diode 1206 is coupled to the second source/drain terminal of the NMOS transistor 1202 and the cathode terminal thereof is grounded through the capacitor 1208. Since the gate terminal of the NMOS transistor 1202 receives the driving signal Ic, the voltage adjusting module 1200 can generate the driving signal ic according to the duty cycle of the driving signal Ic to drive the backlight module. Thereby, the voltage adjustment module 12 产生 can generate the driving signals having different levels according to the duty cycle of the driving signal Ic. FIG. 12B is a circuit diagram of a voltage adjustment module according to another embodiment of the invention. Referring to Figure 12B, another voltage adjustment module 1220 is disclosed. In the voltage adjustment module 1220, the anode terminal of the diode 1222 is grounded, and the cathode terminal is coupled to the first source/汲 terminal of a PMOS transistor 1224. In addition, the gate terminal of the PM〇s transistor 1224 is coupled to the driving signal generated by each of the control units; [C, and the second source/汲 terminal is coupled to the voltage source Vcc. In the voltage adjustment module 122, an inductor 1226 is further disposed. The first end of the inductor 1226 is coupled to the cathode end of the diode 1222, and the second end of the inductor 1226 is grounded through a capacitor 1228. Similarly, since the gate terminal of the pm 〇S transistor 1224 receives the driving signal Ic, the voltage adjusting module 122 产生 can generate the driving signal Ic according to the driving signal Ic, and can be based on the duty cycle of the driving signal Ic. A drive signal Ic having different levels is generated. As described above, since the present invention is a group of illumination sources that drive different color lights in different time intervals. Therefore, the present invention can use less 18 1345741 19472 twf.doc/e hardware lean source to sway the backlight module, and the cost of manufacturing is low. Although the present invention has been disclosed in the preferred embodiment as above, it is also limited to the present invention (4), and any one of them may be made in the county; if the modification and retouching are made, the invention is protected; The scope of the patent application is subject to change. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the driving circuit of a conventional backlight module.

The backlight module of the first embodiment of the present invention is shown in FIG. A, .’s = is a timing chart of the control signal and the driving signal of FIG. Figure. 3B is a timing of another control signal and a driving signal of FIG. 2 - a backlight module of the third embodiment of the present invention

^ is the timing diagram of the control signal and the drive signal of Figure 5. The backlight module of the fourth embodiment of the present invention is a timing chart of the control signal and the driving signal of the second layer. 』Electricity=The backlight module of the fifth embodiment of the present invention is shown as a timing chart of the control signal and the driving signal of FIG. A circuit diagram of a driving circuit of a backlight module 19 1345741 19472 tw doc/e according to a sixth embodiment of the present invention. FIG. 12A is a circuit diagram of a voltage adjustment module in accordance with an embodiment of the present invention. FIG. 12B is a circuit diagram of a voltage adjustment group according to an embodiment of the invention. [Description of main component symbols] 100, 200, 400, 500, 700, 900, 1100: drive circuits 102, 204, 504, 904, 1104: Pulse width modulation (PWM) unit • 104, 106, 108, 202, 502 506, 902, 1102: control unit 120, 240, 440, 540, 940, 1140: backlight modules 122, 124, 126, 242, 244, 246, 442, 444, 446, 448, 542, 544, 546, 942, 944, 946, 1142, 1144, 1146: light source groups 132, 252, 452: red light emitting diodes 134, 254, 454, 456: green light emitting diodes φ 136, 256, 458: Blue light emitting diodes 210, 410, 510, 910: switch modules 212, 214, 216, 412, 414, 416, 418, 512, 514, 516, 912, 914, 916, 1182, 1184, 1186: switch 906 , 1106, 1200, 1220: voltage adjustment modules 962, 964 and 966: resistors 972, 974, 976, 1172, 1174, 1176, 1206: diodes 970, 1170: feedback module 20 1345741 19472twf.doc / e 1192: Comparator 1202: NMOS transistor 1204, 1226: Inductance 1208, 1228: Capacitor 1224: PMOS transistor

twenty one

Claims (1)

1345741 19472twf.doc/e X. Patent application scope: 1. A driving circuit for a backlight module, which is suitable for driving a plurality of illumination sources in the backlight module, and the driving circuit comprises: a signal; a control unit for a pulse width modulation signal is generated to drive a first switch, and the driving signal is turned on to the light source sources in a first time interval according to a first control signal to drive the first time interval a first one of the plurality of illumination sources; and a second switch that conducts the driving signal to the illumination sources in a second time interval according to a second control signal to be in the second time interval Driving a second one of the plurality of illumination sources, wherein the first time interval and the second time interval do not overlap each other, and the first illumination source group and the second illumination source group Groups are independent of each other. 2. The driving circuit of the backlight module of claim i, further comprising a third switch, according to a third control signal, in the third time interval (10), the turn-off is turned on to the hairpins, Driving a third one of the plurality of light sources in a second time interval, wherein: the first time interval, the second time interval, and the third time interval 2~ overlap each other and the third light source group The group and the first illuminating second illuminating source group are independent of each other. , and '5 hai 3. The backlight module circuit as described in claim 2 further includes a fourth switch, according to the fourth control signal, the driving signal is turned on to the illuminating light in the second time interval a source, in a range of 3:42 1345741 19472twf.doc/e, driving the illumination source to a fourth group of illumination sources, wherein the first time interval, the second time interval, the third time interval, and The fourth time interval does not overlap each other, and the fourth illumination source group and the first illumination source group 'the second illumination source group and the third illumination source group are independent of each other. 4. The driving circuit of the backlight module according to claim 3, wherein the first light source group is a red light emitting diode, and the second light source group is a blue light emitting diode, and The third illumination source group and the fourth illumination source group are green light emitting diodes. 5. The driving circuit of the backlight module of claim 3, further comprising a pulse width modulation unit for generating the first control signal, the second control signal, the third control signal, The fourth control signal and the pulse width modulation signal. 6. The driving circuit of the backlight module of claim 3, wherein the first time interval, the second time interval, the third time interval, and the fourth time interval are equal in length, but The driving signals that are turned on to each of the light source groups in each section are different, and are determined according to the data to be displayed. 7. The driving circuit of the backlight module of claim 3, wherein the lengths of the first time interval, the second time interval, the third time interval, and the fourth time interval are according to Display the information behind you to decide. 8. A method for driving a backlight module, which is adapted to drive a plurality of illumination sources in the backlight module, and the driving method comprises the following steps: 23 1345741 19472twf.doc/e driving the first time interval a first light source group in the light source emits light; and a second light source group of the light sources is driven in a second time interval, wherein the first time interval and the second time interval do not overlap each other And the group of illumination sources is independent of the second group of illumination sources. The driving method of the backlight module according to the § § 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The third time interval Z three time intervals do not overlap each other, and the third light source group gives the ~苐-pay group and the second difference group are independent of each other. 10. The driving module of the backlight module of claim 9, further comprising driving the first of the plurality of light sources in the fourth time interval, the first time interval, and the second time interval - The daytime and the fourth time interval do not overlap each other The group and the first light source group, the second light source group to the first hair source group are independent of each other. Λ1.:二申: Driving of the backlight module described in item 10 of the PCT patent scope. The length of the Barmen time interval, the second time _, and the third time I time interval are equal, but in each interval ... method, =· drive of the backlight module described in item 1G of Zhongli Range] /. The time interval, the second time interval, the third time (24 l 'J4!) 741 19472 twf.doc/e interval, and the fourth time interval are determined. The length of the four is based on the driving mode of the backlight module according to claim 10, and the driving source of the backlight module is a red light emitting source, and the second light emitting source group is a blue light emitting source. The third lighting group and the fourth lighting source group are green light emitting sources. 14. A driving circuit for a backlight module, comprising: a first control unit is configured to generate a first driving signal according to the m modulation signal; a first switch, the first driving signal is turned on to the first driving signal according to a first control signal a light source for driving the first one of the plurality of light sources in the first time interval; a second switch for the first driving signal according to a second control signal in a second time interval Conducting to the illumination sources to drive a second one of the plurality of illumination sources during the second time interval, wherein the first time interval and the second time interval do not overlap each other; a first control unit 70, configured to generate a second driving signal according to a second pulse width modulation signal to drive the third light source group, wherein the first light source group, The second illumination source group and the third illumination source group are independent of each other. The driving circuit of the backlight module of claim 14, further comprising a second switch for turning on the second driving signal in a third time interval according to a third control signal And the illumination sources are configured to drive the third illumination source group in the third time interval. 25 1345741 19472hvf.doc/e 16. The driving circuit of the backlight module of claim 15, wherein the portion of the third time interval overlaps with the first time interval, and the second time interval The other __ portion overlaps with the second time interval. 17. The driving circuit 2 of the backlight module of claim 15 further comprising: a pulse width modulation unit for generating the first control signal, the second control signal, the third control signal, and the Pulse width modulation signal. 18. A driving method for a backlight module, adapted to drive a plurality of illumination sources in the backlight module, wherein the driving method comprises the steps of: driving a first one of the illumination sources in a first time interval Grouping; driving a second one of the plurality of illumination sources in a second time interval, wherein the first time interval and the second time interval do not overlap each other; and driving the third time interval a third illuminating source group of the illuminating sources and wherein the third time interval is at least partially overlapped with at least a portion of the first time interval and the second time interval, and the first illuminating source = ' The second illuminant group is independent of each other. The driving module of the backlight module described in claim 18 of the patent application, wherein the third portion of the third time interval and the first portion The second time interval of the second time interval of the time interval is overlapped with the second time interval. 20. A driving circuit for a backlight module, adapted to drive the hair of the hair, the circuit includes: a ^, a 'and a middle-control unit for generating a drive 26 according to a pulse width modulation signal 1345741 19472twf.doc/e signal; a first switch, according to a first control signal, the driving signal is turned on to the light sources in a first time interval to drive the light in the first time interval a first light source group in the source; °° - the second switch 'conducts the driving signal to the light sources in the second time interval according to the second control signal, in the second time interval Driving a second one of the plurality of illumination sources; and generating a feedback signal according to an operating current of the first illumination source group of the actual illumination source group. And causing the control unit to adjust an operating current of the first illumination source group and the second illumination source group according to the feedback signal, wherein the first time interval and the second time interval are not a first light source group and the second light source group Interacting with each other, 2, the backlight module of the mr20 item, the third control signal in the 'drive time interval' is in the third-third movement; the third-light source group in the r, the third illumination source group, =: mutual Repeatedly, and the third illumination source group disk]-the second light source group is independent of each other, a source group and the road, and two: special: Γ surrounded by the third: optical mode (four) The electromotive power = group, the second illuminating; the second dynasty: the first - operative is transmitted to the control unit. The driving circuit of the backlight module of claim 22, wherein the feedback module further comprises: a fourth switch 'which is the first The switch synchronization 'is used to send the -first reference voltage to the miscellaneous unit during the first time interval; the fifth switch is synchronized with the second switch for use in the second time zone - the second reference The voltage is sent to the hard-to-manufacture unit; and - the sixth switch' and the third cheerful step are used to send a reference voltage to the control unit in the third time interval, which = the control unit will send the feedback The signal is compared with the first reference electrical test voltage and the third reference voltage respectively, and is based on = comparison, , and . If so, the division should adjust the magnitude of the current of the first-light source group, the second light-emitting group, and the third light source group. = The driving module of the backlight module of claim 21, wherein the driving module comprises a voltage of 5 weeks, and generates an operating current of 3 according to the driving signal to respectively drive the first light source group. a group, the younger one light source group and the third light source group. =·If the driving power of the backlight module described in the 24th patent scope of the application, the Zhonghaohai voltage adjustment module includes: NM〇S transistor 'its first source / no extreme grounding, its gate terminal Receiving the driving signal; the first end of the inductor is coupled to the second source/drain 鳊 of the NM〇s transistor, and the second end is coupled to a voltage source; the second body is coupled to the anode end The first end of the inductor; and the electric valley, the first end of which is grounded, and the second end is coupled to the cathode end of the diode. 28 1345741 19472twf.doc/e road special machine _24 excerpt drive circuit of the back domain group The voltage adjustment module comprises: a diode body whose anode end is grounded; - a PMOS electric 35 body 'its first source/not extremely lightly connected to the diode body I: voltage: terminally receives the driving signal' And the second source/汲 terminal; an electric f, the first end of which is coupled to the cathode end of the diode; and the end. The capacitor has a first end grounded, and a second end of which is connected to the inductor. The driving power of the backlight module described in Item 21 of the second patent patent scope is f!?:: the light source group red light emitting diode, the second hair === pole: like the group of illumination sources, most of the two = group = driving the first of the illumination sources in the first time interval to drive the group of the illumination sources in the second time interval The group of illuminations wherein the first time interval and the first illumination source group and the second illumination source respectively adjust the first illumination according to actual current passing through the first illumination source group and the second transmission 3 The operating current of the source group and the illuminating light source group. μ 。 。 。 。 。 。 。 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 29 Driving the light source to the third light source f group, the light in the second time interval, and the first time interval, the second time interval, and the third % interval do not overlap each other, and the first The three illumination source groups and the first illumination source group and the second illumination source group are independent of each other; and the third illumination source group is adjusted according to an actual operating current of the third illumination source group. The size of the working current. 30. If the scope of patent application is 29 The driving method of the backlight module, wherein the step of adjusting the working current magnitude comprises the following steps: comparing the working voltage of the first lighting source group with a first reference voltage in the first time interval, and generating a first comparison result; adjusting the first illumination source group current according to the first comparison result; the current β is in the second time interval, the working source of the second illumination source group and a second reference Comparing the voltages and generating a second comparison result; adjusting the work of the second illumination source group according to the second comparison result Comparing the working voltage of the third illumination source group with the third reference voltage in the third time interval, and generating a third comparison result, and the electric party adjusts the third illumination according to the third comparison result. The operation of the source group is as follows: the driving path of the backlight module described in claim 28, wherein the first-light source group is a red light source and the second group is a blue light source. The three illumination source groups and the fourth group are green light illumination sources. ",