CN109949753B - Power supply device of backlight source - Google Patents
Power supply device of backlight source Download PDFInfo
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- CN109949753B CN109949753B CN201910334635.8A CN201910334635A CN109949753B CN 109949753 B CN109949753 B CN 109949753B CN 201910334635 A CN201910334635 A CN 201910334635A CN 109949753 B CN109949753 B CN 109949753B
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Abstract
本发明实施例公开了一种背光源的供电装置。包括升压模块、控制模块以及开关模块，升压模块分别与显示装置的电源以及显示装置的背光源电连接，用于将显示装置的电源输出的电压调节至显示装置的背光源的工作电压，控制模块分别与升压模块、显示装置的背光源以及显示装置的主板电连接，控制模块用于分区域恒流驱动显示装置的背光源，开关模块分别与升压模块、控制模块、显示装置的电源以及显示装置的主板电连接，开关模块用于控制显示装置的电源对升压模块以及控制模块的上电时序，其中，升压模块的上电时序早于控制模块的上电时序。本发明实施例提供的技术方案可以对显示装置的背光源区域调光。
The embodiment of the invention discloses a power supply device for a backlight source. It includes a boosting module, a control module and a switch module. The boosting module is electrically connected to the power supply of the display device and the backlight source of the display device respectively, and is used to adjust the voltage output by the power supply of the display device to the working voltage of the backlight source of the display device, The control module is respectively electrically connected with the boost module, the backlight source of the display device and the main board of the display device. The control module is used for sub-regional constant current driving of the backlight source of the display device. The power supply and the main board of the display device are electrically connected, and the switch module is used to control the power-on sequence of the power supply of the display device to the boost module and the control module, wherein the power-on sequence of the boost module is earlier than the power-on sequence of the control module. The technical solutions provided by the embodiments of the present invention can adjust the light in the backlight source area of the display device.
Description
Technical Field
The embodiment of the invention relates to the technical field of backlight modules, in particular to a power supply device of a backlight source.
Background
The display panel of the liquid crystal display device does not emit light, so that the liquid crystal display device is provided with the backlight module for providing a light source for the liquid crystal display device, wherein the light emitting state of the backlight source of the backlight module is a key factor influencing the picture display of the display panel.
In most of the liquid crystal display devices, the power supply device of the backlight cannot adjust the brightness of the backlight in different areas, that is, the brightness of the backlight in any area is the same. However, as the demand for the quality of a screen increases and the demand for energy saving of a display device increases, the power supply device of the backlight needs to perform local dimming of the backlight, and if the local dimming is to be realized, the circuit configuration of the power supply device that supplies power to the backlight is also improved accordingly.
Disclosure of Invention
The invention provides a power supply device of a backlight source, which is used for realizing regional dimming of the backlight source of a display device.
In a first aspect, an embodiment of the present invention provides a power supply device for a backlight source, including a voltage boosting module, a control module, and a switch module;
the boosting module is respectively electrically connected with a power supply of the display device and a backlight source of the display device and is used for adjusting the voltage output by the power supply of the display device to the working voltage of the backlight source of the display device;
the control module is respectively electrically connected with the boosting module, the backlight source of the display device and the mainboard of the display device, and is used for constantly driving the backlight source of the display device in different areas according to the backlight control signal sent by the mainboard of the display device;
the switch module is respectively electrically connected with the boost module, the control module, the power supply of the display device and the mainboard of the display device, and is used for controlling the power-on time sequence of the power supply of the display device to the boost module and the control module according to the power supply control signal sent by the mainboard of the display device;
the power-on time sequence of the boost module is earlier than that of the control module.
Optionally, the switch module includes two switch units, each switch unit includes a power input terminal, a control input terminal, and a power output terminal, and the two switch units are a first switch unit and a second switch unit, respectively;
the power supply input end of the first switch unit and the power supply input end of the second switch unit are electrically connected with a power supply of the display device, the control input end of the first switch unit is electrically connected with the first control output end of a mainboard of the display device, the control input end of the second switch unit is electrically connected with the second control output end of the mainboard of the display device, the power supply output end of the first switch unit is electrically connected with the boosting module, and the power supply output end of the second switch unit is electrically connected with the control module;
the time sequence of the first switch unit receiving the power supply control signal is earlier than the time sequence of the second switch unit receiving the power supply control signal.
Optionally, the switching unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first transistor, and a second transistor;
the control end of the first transistor is electrically connected with the second end of the first resistor and the first end of the second resistor respectively, and the first end of the first transistor is electrically connected with the first end of the first resistor; the control end of the second transistor is respectively electrically connected with the second end of the third resistor and the first end of the fourth resistor, the second end of the second transistor is electrically connected with the second end of the second resistor, and the first end of the second transistor and the second end of the fourth resistor are grounded; the first end of the first resistor is a power input end of the switch unit, the second end of the first transistor is an output end of the switch unit, and the first end of the third resistor is a control input end of the switch unit.
Optionally, the switching unit further comprises a first capacitor and a second capacitor;
the first end of the first capacitor is electrically connected with the first end of the first resistor, and the second end of the first capacitor is electrically connected with the second end of the first resistor; the first end of the second capacitor is electrically connected with the first end of the fourth resistor, and the second end of the second capacitor is electrically connected with the second end of the fourth resistor.
Optionally, the switch module further includes a voltage stabilizing unit, an input end of the voltage stabilizing unit is electrically connected to the power output end of the second switch unit, and an output end of the voltage stabilizing unit is electrically connected to the control module.
Optionally, the voltage stabilizing unit includes a fifth resistor, a sixth resistor, a third capacitor, a third transistor, and a voltage stabilizing diode;
the control end of the third transistor is electrically connected with the second end of the sixth resistor and the first end of the voltage stabilizing diode respectively, the second end of the third transistor is electrically connected with the second end of the fifth resistor and the first end of the sixth resistor, the first end of the third transistor is electrically connected with the first end of the third capacitor, the second end of the third capacitor and the second end of the voltage stabilizing diode are grounded, the first end of the fifth resistor is the input end of the voltage stabilizing unit, and the first end of the third transistor is the output end of the voltage stabilizing unit.
Optionally, the voltage stabilizing unit further includes a voltage stabilizer and a fourth capacitor;
the input end of the voltage stabilizer is electrically connected with the first end of the third transistor, the grounding end of the voltage stabilizer is grounded, the output end of the voltage stabilizer is electrically connected with the first end of the fourth capacitor, the second end of the fourth capacitor is grounded, and the output end of the voltage stabilizer is the output end of the voltage stabilizing unit.
Optionally, the switch module further includes a fifth capacitor, a sixth capacitor, a seventh capacitor, and a seventh resistor;
the first end of the seventh resistor is electrically connected with a power supply of the display device, the second end of the seventh resistor is electrically connected with the power supply input end of the first switch unit, the first end of the fifth capacitor and the first end of the sixth capacitor are both electrically connected with the power supply output end of the first switch unit, the second end of the fifth capacitor and the second end of the sixth capacitor are both grounded, the first end of the seventh capacitor is electrically connected with the power supply output end of the second switch unit, and the second end of the seventh capacitor is grounded.
Optionally, the boost module includes an inductor, a first diode, an eighth capacitor, a switching tube, an eighth resistor, and a controller;
the control end of the switch tube is electrically connected with the first end of the controller, the first end of the switch tube is electrically connected with the second end of the inductor and the anode of the first diode respectively, the cathode of the first diode is electrically connected with the first end of the eighth capacitor, the second end of the eighth capacitor is grounded, the second end of the switch tube is electrically connected with the first end of the eighth resistor and the second end of the controller respectively, the second end of the eighth resistor is grounded, the first end of the inductor is electrically connected with the power supply of the display device, and the cathode of the first diode is electrically connected with the backlight source of the display device; the third end of the controller is electrically connected with the first switch unit, and the fourth end of the controller is electrically connected with the control module.
Optionally, the control module comprises a drive unit and a control unit;
the first end of the control unit is electrically connected with a main board of the display device, the second end of the control unit is electrically connected with the first end of the driving unit, the power input end of the control unit is electrically connected with the output end of the voltage stabilizing unit, the second end of the driving unit is electrically connected with a backlight source of the display device, and the power input end of the driving unit is electrically connected with the power output end of the second switch unit.
According to the power supply device of the backlight source provided by the embodiment of the invention, the power supply of the display device is firstly adjusted to the working voltage of the backlight source of the display device through the boosting module, and then the control module drives the backlight source of the display device by constant current in different areas, so that the problem that the backlight source power supply device in the prior art cannot realize regional dimming of the backlight source is solved, and the effects of regional dimming of the backlight source and screen flash prevention are achieved.
Drawings
Fig. 1 is a schematic structural diagram of a power supply device of a backlight according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another power supply device for a backlight according to an embodiment of the present invention;
fig. 3 is a circuit diagram of a switch module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a power supply device of a backlight according to an embodiment of the present invention. Referring to fig. 1, the power supply device of the backlight source includes a control module 11, a switch module 12, and a boost module 13. The boosting module 13 is electrically connected to the power supply 1 of the display device and the backlight 4 of the display device, respectively, and is configured to adjust a voltage output from the power supply 1 of the display device to an operating voltage of the backlight 4 of the display device. The control module 11 is electrically connected to the boosting module 13, the backlight 4 of the display device, and the main board 3 of the display device, respectively, and the control module 11 is configured to drive the backlight 4 of the display device by constant current in different regions according to the backlight control signal sent by the main board 3 of the display device. The switch module 12 is electrically connected to the boost module 13, the control module 11, the power supply 1 of the display device, and the motherboard 3 of the display device, respectively, and the switch module 12 is configured to control a power-on timing sequence of the power supply 1 of the display device to the boost module 13 and the control module 11 according to a power supply control signal sent by the motherboard 3 of the display device, where the power-on timing sequence of the boost module 13 is earlier than the power-on timing sequence of the control module 11.
The operation of the power supply device of the backlight shown in fig. 1 is as follows: the first direct current voltage (for example, 12V-15V) output by the power supply 1 of the display device is input to the main board 3 of the display device to supply power to the main board 3 of the display device, and meanwhile, the timing of inputting the second direct current voltage output by the power supply 1 of the display device into the boost module 13 is controlled by the switch module 12 to be earlier than the timing of supplying power by the second direct current voltage input control module 11. After the switch module 12 controls the power supply 1 of the display device to power up the boost module 13 according to the power supply control signal sent by the main board 3 of the display device, the boost module 13 adjusts a first direct current voltage (for example, 24V to 100V) input by the power supply 1 of the display device to a working voltage of the backlight 4 of the display device, so as to supply power to the backlight 4 of the display device. After a preset time interval, the switch module 12 controls the power supply 1 of the display device to power up the control module 11 according to the power supply control signal sent by the main board 3 of the display device, and the control module 11 receives the backlight control signal sent by the main board 3 of the display device and drives the backlight source 4 of the display device by constant current in different areas.
It can be understood that, if the boosting module 13 and the control module 11 are powered on simultaneously, in the process that the boosting module 13 adjusts the second voltage output by the power supply 1 of the display device to the working voltage of the backlight 4 of the display device, the control module 11 starts to drive the backlight 4 of the display device to emit light, and the voltage across the backlight 4 of the display device is pulled down, thereby causing the problem of screen flash of the display device. However, the power-on sequence of the boosting module 13 is earlier than the power-on sequence of the control module 11, so that when the control module 11 drives the backlight 4 of the display device by constant current in different regions, the boosting module 13 can already provide the required working voltage for the backlight 4 of the display device, thereby avoiding the problem of screen flash when the display device is turned on.
It should be noted that, the time interval between the power-on timing of the boost module 13 and the power-on timing of the control module 11 can be set by a person skilled in the art according to actual situations. In addition, the communication mode between the motherboard 3 and the control module 11 of the display device, the specific content of the backlight control signal sent by the motherboard 3 of the display device, and the algorithm for calculating the brightness of each region of the backlight source by the control module 11 according to the backlight control signal can be set by those skilled in the art according to the actual situation, and the present application is not limited thereto.
According to the power supply device of the backlight source provided by the embodiment of the invention, the power supply 1 of the display device is firstly adjusted to the working voltage of the backlight source 4 of the display device through the boosting module 13, and then the control module 11 divides the area to drive the backlight source 4 of the display device by the constant current, so that the problem that the backlight source power supply device in the prior art cannot realize the regional dimming of the backlight source is solved, and the effects of regional dimming of the backlight source and screen flash prevention are achieved.
There are various specific setting methods for the above technical solutions, and a typical example will be described in detail below, but the present application is not limited thereto.
Fig. 2 is a schematic structural diagram of another power supply device for a backlight according to an embodiment of the present invention. Referring to fig. 2, the power supply device of the backlight source includes a control module 11, a switch module 12, and a boost module 13. The control module 11 includes a driving unit 111 and a control unit 112. The switch module 12 includes two identical switch units, namely a first switch unit 121 and a second switch unit 122, and a voltage stabilizing unit 123. The boost module 13 includes an inductor L, a first diode D1, an eighth capacitor C8, a switching tube Q4, an eighth resistor R8, and a controller 131.
With continued reference to fig. 2, the connection of the components in the power supply of the backlight is as follows: the control terminal of the switching tube Q4 is electrically connected to the first terminal of the controller 131, the first terminal of the switching tube Q4 is electrically connected to the second terminal of the inductor L and the positive terminal of the first diode D1, the negative terminal of the first diode D1 is electrically connected to the first terminal of the eighth capacitor C8, the second terminal of the eighth capacitor C8 is grounded, the second terminal of the switching tube Q4 is electrically connected to the first terminal of the eighth resistor R8 and the second terminal of the controller 131, the second terminal of the eighth resistor R8 is grounded, the first terminal of the inductor L is electrically connected to the power supply 2 of the display device, the negative terminal of the first diode D1 is electrically connected to the backlight 4 of the display device, the third terminal of the controller 131 is electrically connected to the first switching unit 121, and the fourth terminal of the controller 131 is electrically connected to the third terminal of the driving unit 111. The power input end of the first switch unit 121 and the power input end of the second switch unit 122 are electrically connected to the power supply 2 of the display device, the control input end of the first switch unit 121 is electrically connected to the first control output end of the main board 3 of the display device, the control input end of the second switch unit 122 is electrically connected to the second control output end of the main board 3 of the display device, the power output end of the first switch unit 121 is electrically connected to the power input end of the controller 131, the power output end of the second switch unit 122 is electrically connected to the power input end of the driving unit 111 and the input end of the voltage stabilizing unit 123, and the output end of the voltage stabilizing unit 123 is electrically connected to the power input end of the control unit 112. A first end of the control unit 112 is electrically connected to the main board 3 of the display device, a second end of the control unit 112 is electrically connected to a first end of the driving unit 111, and a second end of the driving unit 111 is electrically connected to the backlight 4 of the display device.
The timing when the first switch unit 121 receives the power supply control signal is earlier than the timing when the second switch unit 122 receives the power supply control signal.
For example, the control Unit 112 may be a Micro Controller Unit (MCU) 112, the driving Unit 111 may be a constant current driving chip, and the controller 131 in the boost module 13 may be a DC-DC control chip. The driving unit 111, the control unit 112, and the main board 3 of the display device perform data transmission via a Serial Peripheral Interface (SPI). The power supply control signal received by the first switching unit 121 may be a standby signal STB, and the power supply control signal received by the first switching unit 121 may be a backlight enable signal ENA, and the standby signal STB and the backlight enable signal ENA are time-sequentially set in a main board of the display.
Illustratively, the operation of the power supply device of the backlight source described in fig. 2 is as follows: when the display device is turned on, the second dc voltage output by the power supply 2 of the display device supplies power to the main board 3 of the display device, after the main board of the display device works, the standby signal STB is output, the first switch unit 121 is closed, the first dc voltage output by the power supply 2 of the display device is output to the controller 131 through the first switch unit 121, the controller 131 is powered, and the voltage boosting module 13 is started. After the main board 3 of the display device outputs the standby signal STB for a preset time interval, the backlight enable signal ENA is output, the second switch unit 122 is closed, the first dc voltage output by the power supply 2 of the display device is output to the driving unit 111 of the control module 11 after passing through the second switch unit 122, the driving unit 111 is powered on, and meanwhile, the voltage output from the second switch unit 122 is output to the control unit 112 through the voltage stabilizing unit 123 to supply power to the control unit 112. Thereafter, the boost module 13 works normally to provide the required working voltage for the backlight 4 of the display device, and the driving unit 111 drives the backlight in a constant current manner in different regions.
In the power supply device of the backlight according to the embodiment of the present invention, the first switch unit 121 and the second switch unit 122 control the power-on timing of the voltage boosting module 1313 and the control module 1111, and the voltage stabilizing unit 123 provides a stable voltage for the driving unit 111.
On the basis of the foregoing technical solution, optionally, the switch unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first transistor and a second transistor, a control end of the first transistor is electrically connected to a second end of the first resistor and a first end of the second resistor, respectively, and a first end of the first transistor is electrically connected to a first end of the first resistor; the control end of the second transistor is respectively electrically connected with the second end of the third resistor and the first end of the fourth resistor, the second end of the second transistor is electrically connected with the second end of the second resistor, and the first end of the second transistor and the second end of the fourth resistor are grounded; the first end of the first resistor is a power input end of the switch unit, the second end of the first transistor is an output end of the switch unit, and the first end of the third resistor is a control input end of the switch unit.
Optionally, the switch unit further includes a first capacitor and a second capacitor, a first end of the first capacitor is electrically connected to a first end of the first resistor, and a second end of the first capacitor is electrically connected to a second end of the first resistor; the first end of the second capacitor is electrically connected with the first end of the fourth resistor, and the second end of the second capacitor is electrically connected with the second end of the fourth resistor. This has the advantage of eliminating the effect of noise in the power supply 2 of the display device on the circuitry.
Optionally, the voltage stabilizing unit includes a fifth resistor, a sixth resistor, a third capacitor, a third transistor, and a voltage stabilizing diode, a control end of the third transistor is electrically connected to the second end of the sixth resistor and the first end of the voltage stabilizing diode, a second end of the third transistor is electrically connected to the second end of the fifth resistor and the first end of the sixth resistor, a first end of the third transistor is electrically connected to the first end of the third capacitor, the second end of the third capacitor and the second end of the voltage stabilizing diode are grounded, the first end of the fifth resistor is an input end of the voltage stabilizing unit, and the first end of the third transistor is an output end of the voltage stabilizing unit.
Optionally, the voltage stabilizing unit further includes a voltage stabilizer and a fourth capacitor, an input end of the voltage stabilizer is electrically connected to the first end of the third transistor, a ground end of the voltage stabilizer is grounded, an output end of the voltage stabilizer is electrically connected to the first end of the fourth capacitor, a second end of the fourth capacitor is grounded, and an output end of the voltage stabilizer is an output end of the voltage stabilizing unit. The advantage of this arrangement is to further improve the stability of the voltage output by the regulator block 123.
There are various specific setting methods of the switch module 12 in the above technical solutions, and a detailed description will be given below with reference to typical examples, but the present application is not limited thereto.
Fig. 3 is a circuit diagram of a switch module according to an embodiment of the present invention. Referring to fig. 3, the switch module includes a first switch unit 121, a second switch unit 122, a voltage stabilizing unit 123, a seventh resistor, a second capacitor, a sixth capacitor C6, and a seventh capacitor C7. The first switching unit 121 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first transistor Q1, a second transistor Q2, a first capacitor C1, and a second capacitor C2. The second switching unit 122 includes a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a third transistor Q3, a fourth transistor, a ninth capacitor C9, and a tenth capacitor C10. The voltage stabilizing unit 123 includes a fifth resistor R5, a sixth resistor R6, a third transistor Q3, a voltage stabilizing diode D2, a voltage stabilizer, a third capacitor C3, and a fourth capacitor C4.
With continued reference to fig. 3, the connection relationships among the devices in the switch module shown in fig. 3 are as follows: a control end of the first triode Q1 is electrically connected to the second end of the first capacitor C1, the second end of the first resistor R1 and the first end of the second resistor R2, respectively; a first end of the first triode Q1 is electrically connected to a first end of the first resistor R1 and a first end of the first capacitor C1, respectively; a second end of the first transistor Q1 is electrically connected to a first end of the fifth capacitor C5 and a first end of the sixth capacitor C6, respectively, and a second end of the fifth capacitor C5 and a second end of the sixth capacitor C6 are both grounded; a control end of the second triode Q2 is electrically connected to a second end of the third resistor R3, a first end of the fourth resistor R4 and a first end of the second capacitor C2, respectively, and a first end of the third resistor R3 is electrically connected to the main board 3 of the display device; a second end of the second triode Q2 is electrically connected with a second end of the second resistor R2; the first end of the second triode Q2, the second end of the fourth resistor and the second end of the second capacitor C2 are all grounded, the first end of the first resistor R1 is electrically connected with the second end of the seventh resistor R7, and the first end of the seventh resistor R7 is electrically connected with the power supply 2 of the display device.
A control terminal of the fifth transistor Q5 is electrically connected to the second terminal of the ninth capacitor C9, the second terminal of the ninth resistor R9, the first terminal of the tenth resistor R10, and the power supply 2 of the display device, respectively; a first terminal of the fifth transistor Q5 is electrically connected to a first terminal of the ninth resistor R9, a first terminal of the ninth resistor R9, and the power supply 2 of the display device, respectively; a second end of the fifth triode Q5 is electrically connected to a first end of the seventh capacitor C7 and a first end of the fifth resistor R5, respectively, and a second end of the seventh capacitor C7 is grounded; a control end of the sixth triode Q6 is electrically connected to the second end of the eleventh resistor R11, the first end of the twelfth resistor R12 and the first end of the tenth capacitor C10, respectively, and the first end of the eleventh resistor R11 is electrically connected to the main board 3 of the display device; a second terminal of the sixth transistor Q6 is electrically connected to a second terminal of the tenth resistor R10; a first terminal of the sixth transistor Q6, a second terminal of the twelfth resistor R12, and a second terminal of the tenth capacitor C10 are all grounded. A control end of the third transistor Q3 is electrically connected to the second end of the sixth resistor R6 and the first end of the zener diode D2, respectively; a second end of the third transistor Q3 is electrically connected to a second end of the fifth resistor R5 and a first end of the sixth resistor, respectively; a first end of the third transistor Q3 is electrically connected to the first end of the third capacitor C3 and the input terminal IN of the voltage regulator, respectively, a second end of the third capacitor C3, a second end of the zener diode D2, and a ground terminal ADJ of the voltage regulator are grounded, an output terminal OUT of the voltage regulator is electrically connected to the first end of the fourth capacitor C4, and a second end of the fourth capacitor C4 is grounded. The second end of the first triode Q1 is a first voltage output terminal VCC1 of the switch module, the second end of the fifth triode Q5 is a second voltage output terminal VCC2 of the switch module, and the output terminal OUT of the voltage stabilizer is a third voltage output terminal VCC3 of the switch module.
The operation of the switching module described in fig. 3 is, for example, as follows: when the display device is powered on, the power supply 2 of the display device supplies power to the main board 3 of the display device, after the main board 3 of the display device works, the standby signal STB is output, after the voltage is divided by the third resistor R3 and the fourth resistor R4, the standby signal STB is input to the control end of the second triode Q2, the second triode Q2 is conducted, the first triode Q1 is further conducted, the power supply 2 of the display device is filtered through the fifth capacitor C5 and the sixth capacitor C6 and then output, the power supply supplies power to the controller of the boosting module, and the boosting module is started. The main board 3 of the display device outputs the backlight enable signal ENA after outputting the standby signal STB for a preset time interval, the backlight enable signal ENA is divided by an eleventh resistor R11 and a twelfth resistor R12 and then input to the control terminal of a sixth triode Q6, the sixth triode Q6 is conducted, and then a seventh triode Q7 is conducted, the power of the display device is filtered and output by a seventh capacitor C7 to supply power to the driving unit of the control module, and meanwhile, the power is output to the control unit of the control module after passing through the voltage stabilizing unit 123 to supply power to the control unit. Then, the boost module works normally to provide the required working voltage for the backlight 4 of the display device, and the driving unit 111 drives the backlight in a constant current manner in different regions.
It can be understood that the switch module shown in fig. 3 can satisfy the power-on timing sequence of the boost module and the control module in the backlight display device, and has stable performance, simple circuit and low cost.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. The power supply device of the backlight source is characterized by comprising a boosting module, a control module and a switch module;
the boosting module is respectively electrically connected with a power supply of the display device and a backlight source of the display device and is used for adjusting the voltage output by the power supply of the display device to the working voltage of the backlight source of the display device;
the control module is respectively and electrically connected with the boosting module, the backlight source of the display device and the mainboard of the display device, and the control module is used for driving the backlight source of the display device in a constant current manner in different areas according to a backlight control signal sent by the mainboard of the display device;
the switch module is respectively electrically connected with the boosting module, the control module, the power supply of the display device and the mainboard of the display device, and the switch module is used for controlling the power-on time sequence of the power supply of the display device to the boosting module and the control module according to a power supply control signal sent by the mainboard of the display device;
the power-on time sequence of the boosting module is earlier than that of the control module;
the switch module comprises two switch units, each switch unit comprises a power supply input end, a control input end and a power supply output end, and the two switch units are respectively a first switch unit and a second switch unit;
the power input end of the first switch unit and the power input end of the second switch unit are both electrically connected with a power supply of the display device, the control input end of the first switch unit is electrically connected with the first control output end of a mainboard of the display device, the control input end of the second switch unit is electrically connected with the second control output end of the mainboard of the display device, the power output end of the first switch unit is electrically connected with the boosting module, and the power output end of the second switch unit is electrically connected with the control module;
the time sequence of the first switch unit receiving the power supply control signal is earlier than the time sequence of the second switch unit receiving the power supply control signal.
2. The backlight power supply device according to claim 1, wherein the switching unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a first transistor, and a second transistor;
a control end of the first transistor is electrically connected with a second end of the first resistor and a first end of the second resistor respectively, and a first end of the first transistor is electrically connected with a first end of the first resistor; a control end of the second transistor is electrically connected with a second end of the third resistor and a first end of the fourth resistor respectively, a second end of the second transistor is electrically connected with a second end of the second resistor, and the first end of the second transistor and the second end of the fourth resistor are grounded; the first end of the first resistor is a power input end of the switch unit, the second end of the first transistor is an output end of the switch unit, and the first end of the third resistor is a control input end of the switch unit.
3. The backlight power supply device according to claim 2, wherein the switching unit further includes a first capacitor and a second capacitor;
the first end of the first capacitor is electrically connected with the first end of the first resistor, and the second end of the first capacitor is electrically connected with the second end of the first resistor; the first end of the second capacitor is electrically connected with the first end of the fourth resistor, and the second end of the second capacitor is electrically connected with the second end of the fourth resistor.
4. The backlight source power supply device according to claim 1, wherein the switch module further comprises a voltage regulator, an input terminal of the voltage regulator is electrically connected to the power output terminal of the second switch unit, and an output terminal of the voltage regulator is electrically connected to the control module.
5. The power supply device of the backlight source according to claim 4, wherein the voltage regulation unit comprises a fifth resistor, a sixth resistor, a third capacitor, a third transistor and a voltage regulation diode;
the control end of the third transistor is electrically connected to the second end of the sixth resistor and the first end of the zener diode, respectively, the second end of the third transistor is electrically connected to the second end of the fifth resistor and the first end of the sixth resistor, the first end of the third transistor is electrically connected to the first end of the third capacitor, the second end of the third capacitor and the second end of the zener diode are grounded, the first end of the fifth resistor is the input end of the voltage stabilizing unit, and the first end of the third transistor is the output end of the voltage stabilizing unit.
6. The backlight source power supply device according to claim 5, wherein the voltage regulator unit further comprises a voltage regulator and a fourth capacitor;
the input end of the voltage stabilizer is electrically connected with the first end of the third transistor, the grounding end of the voltage stabilizer is grounded, the output end of the voltage stabilizer is electrically connected with the first end of the fourth capacitor, the second end of the fourth capacitor is grounded, and the output end of the voltage stabilizer is the output end of the voltage stabilizing unit.
7. The backlight source power supply device according to claim 1, wherein the switch module further comprises a fifth capacitor, a sixth capacitor, a seventh capacitor, and a seventh resistor;
the first end of the seventh resistor is electrically connected with a power supply of the display device, the second end of the seventh resistor is electrically connected with the power supply input end of the first switch unit, the first end of the fifth capacitor and the first end of the sixth capacitor are both electrically connected with the power supply output end of the first switch unit, the second end of the fifth capacitor and the second end of the sixth capacitor are both grounded, the first end of the seventh capacitor is electrically connected with the power supply output end of the second switch unit, and the second end of the seventh capacitor is grounded.
8. The backlight source power supply device according to claim 1, wherein the boost module comprises an inductor, a first diode, an eighth capacitor, a switch tube, an eighth resistor, and a controller;
the control end of the switch tube is electrically connected with the first end of the controller, the first end of the switch tube is electrically connected with the second end of the inductor and the anode of the first diode respectively, the cathode of the first diode is electrically connected with the first end of the eighth capacitor, the second end of the eighth capacitor is grounded, the second end of the switch tube is electrically connected with the first end of the eighth resistor and the second end of the controller respectively, the second end of the eighth resistor is grounded, the first end of the inductor is electrically connected with the power supply of the display device, and the cathode of the first diode is electrically connected with the backlight source of the display device; and the third end of the controller is electrically connected with the first switch unit, and the fourth end of the controller is electrically connected with the control module.
9. The backlight power supply device according to claim 4, wherein the control module includes a driving unit and a control unit;
the first end of the control unit is electrically connected with a main board of the display device, the second end of the control unit is electrically connected with the first end of the driving unit, the power input end of the control unit is electrically connected with the output end of the voltage stabilizing unit, the second end of the driving unit is electrically connected with a backlight source of the display device, and the power input end of the driving unit is electrically connected with the power output end of the second switch unit.
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| CN201910334635.8A CN109949753B (en) | 2019-04-24 | 2019-04-24 | Power supply device of backlight source |
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| CN201910334635.8A CN109949753B (en) | 2019-04-24 | 2019-04-24 | Power supply device of backlight source |
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| CN109949753B true CN109949753B (en) | 2021-06-11 |
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| CN103745693B (en) * | 2013-12-27 | 2016-01-27 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit and driving method thereof |
| CN104332140B (en) * | 2014-10-28 | 2017-04-19 | 深圳创维－Rgb电子有限公司 | Backlight driving system for regional dimming and regional dimming method |
| KR102333485B1 (en) * | 2015-03-02 | 2021-12-01 | 삼성전자주식회사 | Display driving integrated circuit and display device including the same |
| TWM534491U (en) * | 2016-09-26 | 2016-12-21 | Semisilicon Technology Corp | Light emitting diode driving system with fast voltage-adjusting circuit |
| CN106409220B (en) * | 2016-09-29 | 2019-01-29 | 深圳创维－Rgb电子有限公司 | A kind of OLED drive electric power unit and OLED TV |
| CN106448577B (en) * | 2016-11-29 | 2019-02-26 | 深圳创维－Rgb电子有限公司 | A backlight constant current driver board and LCD TV |
| CN106898302B (en) * | 2017-04-24 | 2019-01-25 | 京东方科技集团股份有限公司 | Pixel circuit control unit, driving method, pixel circuit, and display device |
| CN207117164U (en) * | 2017-08-22 | 2018-03-16 | 深圳创维－Rgb电子有限公司 | The power protecting circuit and display device of a kind of display device |
| CN107317481B (en) * | 2017-08-25 | 2020-02-07 | 深圳创维－Rgb电子有限公司 | Multi-stage DC-DC converter, power supply device and display equipment |
| CN108231014B (en) * | 2018-02-08 | 2020-08-04 | 深圳创维－Rgb电子有限公司 | Regional dimming constant current control circuit, driving power supply and television |
| CN109639161B (en) * | 2019-02-21 | 2025-01-07 | 合肥惠科金扬科技有限公司 | Voltage conversion circuit and display device |
| CN109658878B (en) * | 2019-03-04 | 2024-01-09 | 重庆惠科金扬科技有限公司 | Backlight driving circuit of display panel and display device |
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