CN217606536U - Backlight driving circuit, backlight driving device and backlight assembly - Google Patents
Backlight driving circuit, backlight driving device and backlight assembly Download PDFInfo
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- CN217606536U CN217606536U CN202221251574.2U CN202221251574U CN217606536U CN 217606536 U CN217606536 U CN 217606536U CN 202221251574 U CN202221251574 U CN 202221251574U CN 217606536 U CN217606536 U CN 217606536U
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Abstract
The application belongs to the technical field of backlight drive, and provides a backlight drive circuit, a backlight drive device and a backlight assembly, wherein the backlight drive circuit comprises: the backlight driving circuit comprises a driving voltage input end, a light source anode port, a light source cathode port, a backlight driving module, an adaptive switch module and an adaptive feedback module, wherein the driving voltage input end is connected with driving voltage, the light source cathode port and the light source anode port are connected with the light source module, the adaptive switch module is switched on or switched off according to a voltage adaptive signal to adjust the voltage at two ends of the light source module, the adaptive feedback module generates a voltage feedback signal according to the on-off state of the adaptive switch module and sends the voltage feedback signal to the backlight driving module, the backlight driving module outputs the voltage adaptive signal and adjusts the voltage of the driving voltage input end according to the voltage feedback signal, so that the backlight voltage can be adjusted under different application scenes, and the problem that the adaptation range of the backlight voltage is narrow is solved.
Description
Technical Field
The present application belongs to the technical field of backlight driving, and in particular, to a backlight driving circuit, a backlight driving device and a backlight assembly.
Background
At present, in the TV industry, the LED backlight voltage adaptation range is narrow, so that the output of a transformer needs to be relatively low voltage, otherwise, the problem of backlight brightness is easy to occur when a user turns off a screen to listen to music, and under the condition of large output power, the transformer can only output relatively low voltage in order to avoid the problem of slight brightness of backlight, so that the problems of relatively low conversion efficiency of the transformer and temperature rise of the transformer are caused.
SUMMERY OF THE UTILITY MODEL
The present application aims to provide a backlight driving circuit, a backlight driving device and a backlight assembly, and aims to solve the problem that the adaptation range of the backlight voltage is narrow.
A first aspect of an embodiment of the present application provides a backlight driving circuit, including:
the driving voltage input end is used for connecting driving voltage;
the light source anode port is connected with the driving voltage input end;
the light source cathode port and the light source anode port are used for being connected into a light source module;
the backlight driving module is connected with the driving voltage input end and used for outputting a voltage adaptation signal;
the adaptive switch module is connected with the backlight driving module and the negative electrode port of the light source and is used for receiving the voltage adaptive signal and conducting or switching off according to the voltage adaptive signal so as to adjust the voltage at two ends of the light source module;
the adaptive feedback module is connected with the backlight driving module and the adaptive switch module and used for generating a voltage feedback signal according to the on-off state of the adaptive switch module and sending the voltage feedback signal to the backlight driving module;
the backlight driving module is further used for adjusting the voltage of the driving voltage input end according to the voltage feedback signal.
In one embodiment, the adaptive switch module comprises:
the switch driving unit is connected with the backlight driving module and used for receiving the voltage adaptation signal and generating a switch driving signal according to the voltage adaptation signal;
and the switch unit is connected with the light source negative electrode port, the adaptive feedback module and the switch driving unit and used for receiving the switch driving signal and controlling the connection state between the adaptive feedback module and the light source negative electrode port according to the switch driving signal.
In one embodiment, the adaptive switch module further comprises:
and the thermistor unit is arranged between the negative electrode port of the light source and the switch unit and used for adjusting the resistance value according to the temperature of the switch unit so as to adjust the current flowing through the switch unit.
In one embodiment, the adaptation feedback module comprises:
the voltage division unit is connected with the adaptive switch module and used for generating a voltage feedback signal according to the on-off state of the adaptive switch module;
and the filtering unit is connected with the voltage dividing unit and the backlight driving module and is used for filtering the voltage feedback signal.
In one embodiment, the backlight driving module includes:
the driving unit is connected with the adaptive feedback module and used for generating a backlight modulation signal according to the voltage feedback signal;
and the modulation switch unit is connected with the driving unit and used for receiving the backlight modulation signal and conducting or switching off according to the backlight modulation signal so as to adjust the voltage of the driving voltage input end.
In one embodiment, the backlight driving module further includes:
the current sampling unit is connected with the driving voltage input end and the driving unit and is used for sampling the driving voltage input end to generate a current sampling signal and sending the current sampling signal to the driving unit;
wherein the driving unit is further configured to adjust the backlight modulation signal according to the current sampling signal.
In one embodiment, the backlight driving circuit further includes:
the voltage sampling module is connected with the light source anode port and the backlight driving module and is used for sampling the voltage of the light source anode port to generate a voltage sampling signal and sending the voltage sampling signal to the backlight driving module;
the backlight driving module is further used for adjusting the voltage of the driving voltage input end according to the voltage sampling signal.
In one embodiment, the backlight driving circuit further includes:
and the voltage transformation module is connected with the driving voltage input end and used for accessing a power supply signal and carrying out voltage transformation processing on the power supply signal to generate the driving voltage.
The second aspect of the embodiments of the present application also provides a backlight driving apparatus, including the backlight driving circuit as described in any one of the above.
The third aspect of the embodiments of the present application also provides a backlight assembly including the backlight driving circuit as described in any one of the above.
The embodiment of the application provides a backlight drive circuit, a backlight drive device and a backlight assembly, wherein the backlight drive circuit comprises: the backlight driving circuit comprises a driving voltage input end, a light source anode port, a light source cathode port, a backlight driving module, an adaptive switch module and an adaptive feedback module, wherein the driving voltage input end is connected with driving voltage, the light source cathode port and the light source anode port are connected with the light source module, the adaptive switch module is switched on or switched off according to a voltage adaptive signal to adjust the voltage at two ends of the light source module, the adaptive feedback module generates a voltage feedback signal according to the on-off state of the adaptive switch module and sends the voltage feedback signal to the backlight driving module, the backlight driving module outputs the voltage adaptive signal and adjusts the voltage of the driving voltage input end according to the voltage feedback signal, so that the backlight voltage can be adjusted under different application scenes, and the problem that the adaptation range of the backlight voltage is narrow is solved.
Drawings
Fig. 1 is a schematic structural diagram of a backlight driving circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of another backlight driving circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another backlight driving circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another backlight driving circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
An embodiment of the present application provides a backlight driving circuit, as shown in fig. 1, the backlight driving circuit includes: a driving voltage input terminal 110, a light source positive terminal 121, a light source negative terminal 122, a backlight driving module 400, an adaptive switch module 200, and an adaptive feedback module 300.
Specifically, the driving voltage input terminal 110 is used for accessing a driving voltage; the light source cathode port 122 and the light source anode port 121 are used for connecting a light source module; the backlight driving module 400 is connected to the driving voltage input terminal 110, the backlight driving module 400 outputs a voltage adapting signal to the adapting switch module 200, the adapting switch module 200 is connected to the backlight driving module 400 and the light source negative terminal 122, the adapting switch module 200 receives the voltage adapting signal, and the voltage adapting signal is turned on or off according to the voltage adapting signal to adjust the voltage at the two ends of the light source module; the adaptive feedback module 300 is connected with the backlight driving module 400 and the adaptive switch module 200, and the adaptive feedback module 300 generates a voltage feedback signal according to the on-off state of the adaptive switch module 200 and sends the voltage feedback signal to the backlight driving module 400; the backlight driving module 400 is further configured to adjust the voltage of the driving voltage input terminal 110 according to the voltage feedback signal.
In this embodiment, the backlight driving module 400 is connected to the driving voltage input terminal 110, the driving voltage input terminal 110 is connected to the driving voltage, the backlight driving module 400 sends a voltage adaptation signal to the adaptation switch module 200, the adaptation switch module 200 is turned on or off according to the voltage adaptation signal to adjust the voltage at two ends of the light source module, the adaptation feedback module 300 generates a voltage feedback signal according to the on-off state of the adaptation switch module 200 and sends the voltage feedback signal to the backlight driving module 400, and the backlight driving module 400 adjusts the voltage at the driving voltage input terminal 110 according to the voltage feedback signal, so that the backlight voltage can be adjusted in different application scenarios, and the problem of narrow adaptation range of the backlight voltage is solved.
In one embodiment, referring to fig. 2, the adaptive switch module 200 includes: switch drive unit 410210, switch unit 220.
The switch driving unit 410210 is connected with the backlight driving module 400, and the switch driving unit 410210 is configured to receive the voltage adaptation signal and generate a switch driving signal according to the voltage adaptation signal; the switch unit 220 is connected to the light source cathode port 122, the adaptive feedback module 300, and the switch driving unit 410210, and the switch unit 220 is configured to receive the switch driving signal and control a connection state between the adaptive feedback module 300 and the light source cathode port 122 according to the switch driving signal.
In this embodiment, the switch driving unit 410210 generates a corresponding switch driving signal according to the voltage adaptation signal to drive the switch unit 220 to be turned on or off, so as to control the connection state between the adaptation feedback module 300 and the light source cathode port 122.
In a specific application embodiment, the switch unit 220 controls the connection state between the adaptive feedback module 300 and the light source negative port 122, and the voltages at the two ends of the light source module are different when the switch unit 220 is in the on and off states.
In one embodiment, referring to fig. 4, the switch driving unit 410210 includes: the circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first switch tube Q1 and a second switch tube Q2.
Specifically, the first end of the first resistor R1 and the first end of the second resistor R2 are commonly connected to the switch unit 220, the second end of the second resistor R2, the first end of the third resistor R3 and the first end of the first switch tube Q1 are commonly connected, the control end of the first switch tube Q1, the first end of the fifth resistor R5, the first end of the second switch tube Q2 and the first end of the fourth resistor R4 are commonly connected, the second end of the third resistor R3 and the second end of the fourth resistor R4 are commonly connected to the power source terminal, the control end of the second switch tube Q2, the first end of the sixth resistor R6 and the first end of the seventh resistor R7 are commonly connected, the second end of the seventh resistor R7, the second end of the second switch tube Q2, the second end of the fifth resistor R5, the second end of the first switch tube Q1 and the second end of the first resistor R1 are commonly connected to the ground, and the second end of the sixth resistor R6 is connected to the backlight driving module 400.
In some embodiments, the first switching tube Q1 and the second switching tube Q2 may be NPN transistors.
Specifically, as shown in fig. 4, the first end of the sixth resistor R6 is connected to the backlight driving module 400 and configured to receive the voltage adaptation signal PB, the sixth resistor R6 and the seventh resistor R7 form a voltage dividing circuit, if the voltage adaptation signal PB is at a high level, the voltage at the control end of the second switch tube Q2 is at the high level, the second switch tube Q2 is turned on, the voltage at the control end of the first switch tube Q1 is pulled low, the first switch tube Q1 is turned off, the level at the control end of the switching unit 220 is pulled to be at the high level, the switching unit 220 is turned on, and at this time, the adaptation feedback module 300 is turned on with the light source negative electrode port 122.
If the voltage adaptation signal PB is at a low level, the second switch tube Q2 is turned off, the voltage of the control end of the first switch tube Q1 is set to be at a high level, the first switch tube Q1 is turned on, the control end of the switch unit 220 is set to be at a low level, the switch unit 220 is turned off, at this time, the adaptation feedback module 300 and the light source cathode port 122 are turned off, so that the on and off of the switch unit 220 are controlled by setting the level of the voltage adaptation signal PB, the backlight voltage regulation of the light source anode port 121 and the light source cathode port 122 is realized, and the purpose of adapting the wide voltage is achieved.
In one embodiment, as shown in fig. 4, the switch unit 220 includes a third switch tube Q3, a first end of the third switch tube Q3 is connected to the light source negative port 122, a second end of the third switch tube Q3 is connected to the adaptive feedback module 300, and a control end of the third switch tube Q3 is connected to the switch driving unit 410210.
In a specific application embodiment, the third switching transistor Q3 may be an N-type MOS transistor.
In one embodiment, referring to fig. 2, the adaptive switch module 200 further comprises: the thermistor unit 230.
Specifically, the thermistor unit 230 is disposed between the light source negative terminal port 122 and the switching unit 220, and is used for adjusting a resistance value according to the temperature of the switching unit 220 to adjust the current flowing through the switching unit 220.
In the present embodiment, the thermistor unit 230 is disposed between the light source negative port 122 and the switch unit 220, so that the thermistor not only can adjust the resistance value of the switch unit 220 according to the temperature of the switch unit 220 to adjust the current flowing through the switch unit 220, but also can adjust the voltage feedback signal by adjusting the resistance value of the switch unit 220 according to the temperature of the switch unit 220.
In one embodiment, as shown in conjunction with fig. 4, the thermistor unit 230 may be a thermistor NTC.
In one embodiment, referring to fig. 2, the adaptive feedback module 300 includes: a voltage dividing unit 310 and a filtering unit 320.
In this embodiment, the voltage dividing unit 310 is connected to the adaptive switch module 200, and is configured to generate a voltage feedback signal according to the on-off state of the adaptive switch module 200; the filtering unit 320 is connected to the voltage dividing unit 310 and the backlight driving module 400, and is configured to filter the voltage feedback signal.
In this embodiment, the voltage dividing unit 310 is connected to the backlight driving module 400 and provides a voltage feedback signal to the backlight driving module 400, wherein the voltage dividing unit 310 is further connected to the light source negative port 122 through the adaptive switch module 200, when the adaptive switch module 200 is in the on state and the off state, the voltages of the voltage feedback signals generated by the voltage dividing unit 310 are different, and the backlight driving module 400 adjusts the voltage of the driving voltage input terminal 110 according to the voltage of the voltage feedback signal.
In one embodiment, as described in conjunction with fig. 4, the voltage dividing unit 310 includes: an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, and a first diode D1. Specifically, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, and the twelfth resistor R12 are connected in parallel, and form a voltage divider circuit with the eighth resistor R8, the first diode D1 may serve as a bleeding channel, when the switch unit 220 is turned off, the voltage feedback signal is 0, when the switch unit 220 is turned on, the voltage feedback signal is not 0, and at this time, the backlight driving module 400 adjusts the voltage of the driving voltage input terminal 110 according to the voltage feedback signal.
In one embodiment, as described in conjunction with fig. 4, the filtering unit 320 includes a first capacitor C1, a first end of the first capacitor C1 is connected to the voltage dividing unit 310 and the backlight driving module 400, and a second end of the first capacitor C1 is grounded.
In one embodiment, referring to fig. 2, the backlight driving module 400 includes: a driving unit 410 and a modulation switching unit 420.
Specifically, the driving unit 410 is connected to the adaptive feedback module 300, and the driving unit 410 is configured to generate a backlight modulation signal according to the voltage feedback signal; the modulation switch unit 420 is connected to the driving unit 410, and the modulation switch unit 420 is configured to receive the backlight modulation signal and turn on or off according to the backlight modulation signal to adjust the voltage of the driving voltage input terminal 110.
In this embodiment, the driving unit 410 may generate a backlight modulation signal according to the voltage feedback signal, and the modulation switching unit 420 may be turned on or off based on the backlight modulation signal, and adjust the voltage of the driving voltage input terminal 110 by its switching duty ratio.
In a specific application implementation, the driving unit 410 and the modulation switch unit 420 may form a BUCK circuit, an input terminal of the BUCK circuit is connected to the driving voltage input terminal 110, and an output terminal of the BUCK circuit is connected to the light source positive electrode port 121.
In a specific implementation, the driving unit 410 may be composed of a driving chip U1 and its peripheral circuits.
As shown in fig. 4, the driving unit 410 includes: the driving circuit comprises a driving chip U1, a second diode D2, a third diode D3, a fourth capacitor C4, a fifth capacitor C5, a second capacitor C2, a third capacitor C3 and a thirteenth resistor R13.
Specifically, the anode of the third diode D3 is connected to the power supply terminal STB, the power supply pin VIN of the driving chip U1, the cathode of the third diode D3, the first end of the fourth capacitor C4, and the first end of the fifth capacitor C5 are connected to the power supply terminal VCC in common, the second end of the fourth capacitor C4 and the second end of the fifth capacitor C5 are grounded, the driving pin GATE of the driving chip U1 is connected to the modulation switch unit 420, the current detection pin CS of the driving chip U1 and the first end of the second capacitor C2 are connected to the current sampling unit 430 in common, the ground pin GND of the driving chip U1 and the second end of the second capacitor C2 are connected to ground in common, the pulse width modulation pin PWM of the driving chip U1, the anode of the second diode D2, and the first end of the thirteenth resistor R13 are connected in common, the cathode of the second diode D2 is connected to the switch driving unit 410210, and the second end of the thirteenth resistor R13 is used as the adaptation signal access terminal PA to access the voltage adaptation signal.
An overvoltage detection pin OVP of the driving chip U1 is connected with the voltage sampling module 500, a compensation pin COMP of the driving chip U1 is connected with a first end of a third capacitor C3, a second end of the third capacitor C3 is grounded, and a feedback pin FB of the driving chip U1 is connected with the adaptive feedback module 300.
In one embodiment, as shown in conjunction with fig. 4, the modulation switching unit 420 includes: a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a fourth switch Q4, and a fifth switch Q5.
Specifically, the first end of the fourteenth resistor R14 and the first end of the fifteenth resistor R15 are connected to the driving end DR of the driving unit 410, the second end of the fourteenth resistor R14, the first end of the fourth switch tube Q4, the first end of the eighteenth resistor R18, and the control end of the fifth switch tube Q5 are connected to each other, the control end of the fourth switch tube Q4 is connected to the second end of the fifteenth resistor R15, the second end of the fourth switch tube Q4 is connected to the first end of the sixteenth resistor R16, the second end of the eighteenth resistor R18, the first end of the seventeenth resistor R17, the first end of the nineteenth resistor R19, and the first end of the fifth switch tube Q5 are connected to the first end of the twentieth resistor R20, the second end of the sixteenth resistor R16, the second end of the seventeenth resistor R17, and the second end of the nineteenth resistor R19 are connected to ground, and the second end of the fifth switch tube Q5 is connected to the driving voltage input end 110.
In some embodiments, the fourth switching transistor Q4 may be a PNP type transistor, and the fifth switching transistor Q5 may be an N type MOS transistor.
In this embodiment, the fifth switch Q5 is controlled to be turned on or off by the backlight modulation signal, so as to control the voltage of the driving voltage input terminal 110, regulate the voltage of the light source anode port 121, and achieve a wider voltage output.
In a specific application, as shown in fig. 4, the light source positive port 121 and the light source negative port 122 form a light source interface J1, for example, the first pin 1 and the second pin 2 in the light source interface J1 are the light source positive port 121 and the light source negative port 122, respectively.
A first inductor L1, a second inductor L2, a fourth diode D4, a twenty-third resistor R23, and a twenty-fourth resistor R24 are further disposed between the driving voltage input terminal 110 and the light source anode port 121. Specifically, the first inductor L1, the second inductor L2, and the fourth diode D4 are connected in series between the driving voltage input terminal 110 and the light source positive terminal 121, the twenty-third resistor R23 and the twenty-fourth resistor R24 are connected in parallel, and a parallel circuit is connected in parallel with a series circuit formed by the second inductor L2 and the fourth diode D4.
In some embodiments, an eighth capacitor is connected in parallel between the first pin 1 and the second pin 2 in the light source interface J1.
In some embodiments, a filter circuit is further connected to the first pin 1 in the light source interface J1, and the filter circuit is composed of a sixth capacitor C6 and a seventh capacitor, where the sixth capacitor C6 is connected in parallel with the seventh capacitor C7.
In one embodiment, referring to fig. 2, the backlight driving module 400 further includes: a current sampling unit 430.
Specifically, the current sampling unit 430 is connected to the driving voltage input end 110 and the driving unit 410, and the current sampling unit 430 is configured to sample the driving voltage input end 110 to generate a current sampling signal and send the current sampling signal to the driving unit 410; wherein the driving unit 410 is further configured to adjust the backlight modulation signal according to the current sampling signal.
In one embodiment, as shown in connection with fig. 4, the current sampling unit 430 includes: a twentieth resistor R20, a twenty-first resistor R21, and a twenty-second resistor R22.
In this embodiment, the twenty-first resistor R21 is connected in parallel with the twenty-second resistor R22, the parallel circuit and the twentieth resistor R20 are connected in series to form a voltage divider circuit, the first end of the twenty-first resistor R21 and the first end of the twenty-second resistor R22 are connected to the driving voltage input terminal 110, the second end of the twenty-first resistor R21 and the second end of the twenty-second resistor R22 are connected to the first end of the twentieth resistor R20, and the second end of the twentieth resistor R20 is connected to the driving unit 410.
In one embodiment, referring to fig. 3, the backlight driving circuit further includes: the voltage sampling module 500.
The voltage sampling module 500 is connected to the light source anode port 121 and the backlight driving module 400, and the voltage sampling module 500 is configured to perform voltage sampling on the light source anode port 121 to generate a voltage sampling signal and send the voltage sampling signal to the backlight driving module 400; the backlight driving module 400 is further configured to adjust the voltage of the driving voltage input terminal 110 according to the voltage sampling signal.
As shown in fig. 4, the voltage sampling module 500 includes: a ninth capacitor C9, a twenty-fifth resistor R25, a twenty-sixth resistor R26, and a twenty-seventh resistor R27.
Specifically, the twenty-fifth resistor R25, the twenty-sixth resistor R26 and the twenty-seventh resistor R27 are connected in series, the ninth capacitor C9 and the twenty-seventh resistor R27 are connected in parallel, the first end of the ninth capacitor C9 and the first end of the twenty-seventh resistor R27 are connected to the ground in common, and the second end of the ninth capacitor C9 and the second end of the twenty-seventh resistor R27 are connected to the driving unit 410 in common.
In one embodiment, the backlight driving circuit further includes: the voltage transformation module 600.
The transforming module 600 is connected to the driving voltage input terminal 110, and the transforming module 600 is used for accessing a power signal and transforming the power signal to generate the driving voltage.
In this embodiment, the voltage transforming module 600 is configured to access a power signal, perform voltage boosting or voltage dropping processing on the power signal, generate a corresponding driving voltage, and output the driving voltage to the driving voltage input terminal 110.
The embodiment of the present application further provides a backlight driving apparatus, including the backlight driving circuit as described in any one of the above.
The embodiment of the present application further provides a backlight assembly including the backlight driving circuit as described in any one of the above.
The embodiment of the application provides a backlight drive circuit, a backlight drive device and a backlight assembly, wherein the backlight drive circuit comprises: the backlight driving circuit comprises a driving voltage input end, a light source anode port, a light source cathode port, a backlight driving module, an adaptive switch module and an adaptive feedback module, wherein the driving voltage input end is connected with driving voltage, the light source cathode port and the light source anode port are connected with the light source module, the adaptive switch module is switched on or switched off according to a voltage adaptive signal to adjust the voltage at two ends of the light source module, the adaptive feedback module generates a voltage feedback signal according to the on-off state of the adaptive switch module and sends the voltage feedback signal to the backlight driving module, the backlight driving module outputs the voltage adaptive signal and adjusts the voltage of the driving voltage input end according to the voltage feedback signal, so that the backlight voltage can be adjusted under different application scenes, and the problem that the adaptation range of the backlight voltage is narrow is solved.
The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.
Claims (10)
1. A backlight driving circuit, comprising:
the driving voltage input end is used for connecting driving voltage;
the light source anode port is connected with the driving voltage input end;
the light source cathode port and the light source anode port are used for being connected into a light source module;
the backlight driving module is connected with the driving voltage input end and used for outputting a voltage adaptation signal;
the adaptive switch module is connected with the backlight driving module and the negative electrode port of the light source and is used for receiving the voltage adaptive signal and conducting or switching off according to the voltage adaptive signal so as to adjust the voltage at two ends of the light source module;
the adaptive feedback module is connected with the backlight driving module and the adaptive switch module and used for generating a voltage feedback signal according to the on-off state of the adaptive switch module and sending the voltage feedback signal to the backlight driving module;
the backlight driving module is further used for adjusting the voltage of the driving voltage input end according to the voltage feedback signal.
2. The backlight driving circuit of claim 1, wherein the adaptive switch module comprises:
the switch driving unit is connected with the backlight driving module and used for receiving the voltage adaptation signal and generating a switch driving signal according to the voltage adaptation signal;
and the switch unit is connected with the light source cathode port, the adaptive feedback module and the switch driving unit and used for receiving the switch driving signal and controlling the connection state between the adaptive feedback module and the light source cathode port according to the switch driving signal.
3. The backlight driver circuit of claim 2, wherein the adaptive switch module further comprises:
and the thermistor unit is arranged between the negative electrode port of the light source and the switch unit and used for adjusting the resistance value according to the temperature of the switch unit so as to adjust the current flowing through the switch unit.
4. The backlight driving circuit of claim 1, wherein the adaptive feedback module comprises:
the voltage division unit is connected with the adaptive switch module and used for generating a voltage feedback signal according to the on-off state of the adaptive switch module;
and the filtering unit is connected with the voltage dividing unit and the backlight driving module and is used for filtering the voltage feedback signal.
5. The backlight driving circuit according to claim 1, wherein the backlight driving module comprises:
the driving unit is connected with the adaptive feedback module and used for generating a backlight modulation signal according to the voltage feedback signal;
and the modulation switch unit is connected with the driving unit and used for receiving the backlight modulation signal and conducting or switching off according to the backlight modulation signal so as to adjust the voltage of the driving voltage input end.
6. The backlight driving circuit according to claim 5, wherein the backlight driving module further comprises:
the current sampling unit is connected with the driving voltage input end and the driving unit and is used for sampling the driving voltage input end to generate a current sampling signal and sending the current sampling signal to the driving unit;
wherein the driving unit is further configured to adjust the backlight modulation signal according to the current sampling signal.
7. The backlight driving circuit according to claim 1, wherein the backlight driving circuit further comprises:
the voltage sampling module is connected with the light source anode port and the backlight driving module and is used for sampling the voltage of the light source anode port to generate a voltage sampling signal and sending the voltage sampling signal to the backlight driving module;
the backlight driving module is further used for adjusting the voltage of the driving voltage input end according to the voltage sampling signal.
8. The backlight driving circuit of claim 1, further comprising:
and the voltage transformation module is connected with the driving voltage input end and used for accessing a power supply signal and carrying out voltage transformation processing on the power supply signal to generate the driving voltage.
9. A backlight driving device characterized by comprising the backlight driving circuit according to any one of claims 1 to 8.
10. A backlight assembly characterized by comprising the backlight driving circuit according to any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221251574.2U CN217606536U (en) | 2022-05-23 | 2022-05-23 | Backlight driving circuit, backlight driving device and backlight assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221251574.2U CN217606536U (en) | 2022-05-23 | 2022-05-23 | Backlight driving circuit, backlight driving device and backlight assembly |
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| CN217606536U true CN217606536U (en) | 2022-10-18 |
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| CN202221251574.2U Active CN217606536U (en) | 2022-05-23 | 2022-05-23 | Backlight driving circuit, backlight driving device and backlight assembly |
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2022
- 2022-05-23 CN CN202221251574.2U patent/CN217606536U/en active Active
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