CN109410868B - Display panel driving device - Google Patents
Display panel driving device Download PDFInfo
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- CN109410868B CN109410868B CN201811490351.XA CN201811490351A CN109410868B CN 109410868 B CN109410868 B CN 109410868B CN 201811490351 A CN201811490351 A CN 201811490351A CN 109410868 B CN109410868 B CN 109410868B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a display panel driving device. The display panel driving device comprises a power conversion circuit and a mainboard electrically connected with the power conversion circuit; the power conversion circuit comprises a detection control module, a first output module and a second output module, wherein the first output module and the second output module are electrically connected with the detection control module, the voltage value of power voltage can be identified by the detection control module, the first output module or the second output module is controlled to work according to the difference of the voltage values, the voltage input to the mainboard is consistent with the working voltage of the mainboard all the time, the mainboard can be matched with two different power supplies for use, the application range of the mainboard is expanded, and the control cost of a product is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel driving device.
Background
With the development of Display technology, flat panel Display devices such as Liquid Crystal Displays (LCDs) have advantages of high image quality, power saving, thin body, and wide application range, and thus are widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and become the mainstream of Display devices.
Most of the existing liquid crystal display devices in the market are backlight liquid crystal displays (lcds), which include a liquid crystal display panel and a backlight module (backlight module). The liquid crystal display panel has the working principle that liquid crystal molecules are placed in two parallel glass substrates, a plurality of vertical and horizontal fine wires are arranged between the two glass substrates, and the liquid crystal molecules are controlled to change directions by electrifying or not, so that light rays of the backlight module are refracted out to generate pictures.
Generally, the liquid crystal display panel also needs to be driven by an external driving device, as shown in fig. 1, the external driving device generally includes: the power supply 100 and the motherboard 200, the power supply 100 is electrically connected to the motherboard 200, the motherboard 200 is electrically connected to the display panel 300, the power supply 100 is generally configured to provide a power voltage to the motherboard 200, and the motherboard 200 is configured to provide a voltage for driving the display panel 300 to operate to the display panel 300.
In the prior art, the output voltage of the power supply for the liquid crystal display device mainly includes two types, 24V and 12V, and the existing main board generally has a certain working power supply, generally 24V or 12V, that is, in a liquid crystal display device, after the output voltage of the power supply is determined, the type of the main board of the liquid crystal display device is also determined, and the working voltage must be consistent with the output voltage of the power supply to ensure that the main board can work smoothly.
Disclosure of Invention
The invention aims to provide a display panel driving device which can expand the application range of a main board and reduce the product management and control cost.
In order to achieve the above object, the present invention provides a display panel driving device, which includes a power conversion circuit and a main board electrically connected to the power conversion circuit;
the power supply conversion circuit comprises a detection control module, a first output module and a second output module which are electrically connected with the detection control module;
the detection control module is used for receiving a power supply voltage, generating a control signal of a first potential when the voltage value of the power supply voltage is a first voltage value, and generating a control signal of a second potential different from the first potential when the voltage value of the power supply voltage is a second voltage value, wherein the first voltage value is larger than the second voltage value;
the first output module is used for receiving power supply voltage and a control signal, carrying out voltage reduction processing on the power supply voltage when the control signal is at a first potential, outputting the reduced power supply voltage to the mainboard, and stopping outputting the voltage to the mainboard when the control signal is at a second potential;
the second output module is used for receiving power supply voltage and a control signal, outputting the power supply voltage to the mainboard when the control signal is at a second potential, and stopping outputting the voltage to the mainboard when the control signal is at a first potential.
The detection control module comprises: the first resistor, the second resistor, the third resistor and the first triode;
the first end of the first resistor receives a power supply voltage, and the second end of the first resistor is electrically connected with the first end of the second resistor;
the second end of the second resistor is grounded;
the first end of the third resistor is electrically connected with the first end of the first resistor, and the second end of the third resistor is electrically connected with the collector of the first triode and outputs a control signal;
the base electrode of the first triode is electrically connected with the second end of the first resistor, and the emitting electrode of the first triode is grounded.
The first output module includes: the fourth resistor, the fifth resistor, the first MOS tube and the voltage reduction unit;
the first end of the fourth resistor receives power supply voltage, and the second end of the fourth resistor is electrically connected with the first end of the fifth resistor;
a second end of the fifth resistor receives a control signal;
the grid electrode of the first MOS tube is electrically connected with the first end of the fifth resistor, the source electrode of the first MOS tube is electrically connected with the first end of the fourth resistor, and the drain electrode of the first MOS tube is electrically connected with the input end of the voltage reduction unit;
the output end of the voltage reduction unit is electrically connected with the mainboard.
The first output module 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 fourth resistor, and the second end of the first capacitor is grounded;
the first end of the second capacitor is electrically connected with the drain electrode of the first MOS tube, and the second end of the second capacitor is grounded.
The second output module includes: the third resistor is connected with the fourth MOS tube, the fourth MOS tube is connected with the fourth MOS tube, and the fourth MOS tube is connected with the fourth MOS tube;
the first end of the sixth resistor receives the power supply voltage, and the second end of the sixth resistor is electrically connected with the first end of the seventh resistor;
the second end of the seventh resistor is electrically connected with the collector of the second triode;
the first end of the eighth resistor is electrically connected with the first end of the sixth resistor, and the second end of the eighth resistor is electrically connected with the collector of the third triode;
the grid electrode of the second MOS tube is electrically connected with the first end of the seventh resistor, the source electrode of the second MOS tube is electrically connected with the first end of the sixth resistor, and the drain electrode of the second MOS tube is electrically connected with the mainboard;
the base electrode of the second triode is electrically connected with the negative electrode of the two electrodes, and the emitting electrode of the second triode is grounded;
and the base electrode of the third triode receives the control signal, the collector electrode is electrically connected with the anode of the second electrode, and the emitter electrode is grounded.
The second output module further comprises a third capacitor and a fourth capacitor;
the first end of the third capacitor is electrically connected with the first end of the sixth resistor, and the second end of the third capacitor is grounded;
and the first end of the fourth capacitor is electrically connected with the drain electrode of the second MOS tube, and the second end of the fourth capacitor is grounded.
The display panel driving device further comprises a power supply electrically connected with the power conversion circuit, and the power supply is used for outputting power supply voltage to the power conversion circuit.
The step-down processing of the power voltage by the first output module specifically comprises: the power supply voltage is stepped down from a first voltage value to a second voltage value.
The first potential is less than the second potential.
The first voltage value is 24V, and the second voltage value is 12V.
The invention has the beneficial effects that: the invention provides a display panel driving device, which comprises a power conversion circuit and a mainboard, wherein the mainboard is electrically connected with the power conversion circuit; the power conversion circuit comprises a detection control module, a first output module and a second output module, wherein the first output module and the second output module are electrically connected with the detection control module, the voltage value of power voltage can be identified by the detection control module, the first output module or the second output module is controlled to work according to the difference of the voltage values, the voltage input to the mainboard is consistent with the working voltage of the mainboard all the time, the mainboard can be matched with two different power supplies for use, the application range of the mainboard is expanded, and the control cost of a product is reduced.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a schematic diagram of a conventional display panel driving apparatus;
FIG. 2 is a schematic diagram of a display panel driving apparatus according to the present invention;
fig. 3 is a circuit diagram of a power conversion module in the display panel driving apparatus of the invention.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 2 to 3, the present invention provides a display panel driving apparatus, including a power conversion circuit 1 and a main board 2 electrically connected to the power conversion circuit 1;
the power conversion circuit 1 comprises a detection control module 11, and a first output module 12 and a second output module 13 which are electrically connected with the detection control module 11;
the detection control module 11 is configured to receive a power supply voltage Vc, generate a control signal Ctr at a first potential when the voltage value of the power supply voltage Vc is a first voltage value, and generate a control signal Ctr at a second potential different from the first potential when the voltage value of the power supply voltage Vc is a second voltage value, where the first voltage value is greater than the second voltage value;
the first output module 12 is configured to receive a power supply voltage Vc and a control signal Ctr, perform voltage reduction processing on the power supply voltage Vc when the control signal Ctr is a first potential, output the voltage-reduced power supply voltage Vc to the motherboard 2 when the control signal Ctr is a second potential, and stop outputting the voltage to the motherboard 2 when the control signal Ctr is a second potential;
the second output module 13 is configured to receive a power supply voltage Vc and a control signal Ctr, output the power supply voltage Vc to the motherboard 2 when the control signal Ctr is at a second potential, and stop outputting the voltage to the motherboard 2 when the control signal Ctr is at a first potential.
In addition, as shown in fig. 2, the display panel driving apparatus further includes a power supply 3 electrically connected to the power conversion circuit 1, and the power supply 3 is configured to output a power supply voltage Vc to the power conversion circuit 1.
Specifically, the power supply voltage Vc output from the power supply 3 to the power conversion circuit 1 may be 12V or 24V depending on the model of the power supply 3.
Specifically, the step-down processing performed on the power supply voltage Vc by the first output module 11 specifically includes: the supply voltage Vc is stepped down from a first voltage value to a second voltage value, i.e., from 24V to 12V.
Specifically, the first potential is smaller than the second potential.
Specifically, in an embodiment of the present invention, the detection control module 11 includes: a first resistor R1, a second resistor R2, a third resistor R3 and a first transistor T1; a first end of the first resistor R1 receives the power voltage Vc, and a second end of the first resistor R1 is electrically connected to a first end of the second resistor R2; a second end of the second resistor R2 is grounded; a first end of the third resistor R3 is electrically connected to a first end of the first resistor R1, and a second end of the third resistor R3 is electrically connected to a collector of the first transistor T1 and outputs a control signal Ctr; the base of the first triode T1 is electrically connected to the second end of the first resistor R1, and the emitter is grounded.
Specifically, in an embodiment of the present invention, the first output module 12 includes: a fourth resistor R4, a fifth resistor R5, a first MOS transistor Q1 and a voltage reduction unit J1; a first end of the fourth resistor R4 receives the power voltage Vc, and a second end of the fourth resistor R4 is electrically connected to a first end of the fifth resistor R5; a second end of the fifth resistor R5 receives a control signal Ctr; the gate of the first MOS transistor Q1 is electrically connected to the first end of the fifth resistor R5, the source is electrically connected to the first end of the fourth resistor R4, and the drain is electrically connected to the input end of the voltage step-down unit J1; the output end of the voltage reduction unit J1 is electrically connected with the mainboard 2.
Further, in the embodiment of the present invention, the first output module 12 further includes a first capacitor C1 and a second capacitor C2; a first end of the first capacitor C1 is electrically connected to a first end of the fourth resistor R4, and a second end is grounded; the first end of the second capacitor C2 is electrically connected to the drain of the first MOS transistor Q1, and the second end is grounded. The first capacitor C1 and the second capacitor C2 are filter capacitors.
Specifically, the second output module 13 includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second MOS transistor Q2, a second triode T2, a third triode T3 and a diode D1; a first end of the sixth resistor R6 receives the power voltage Vc, and a second end of the sixth resistor R6 is electrically connected to a first end of the seventh resistor R7; a second end of the seventh resistor R7 is electrically connected to a collector of the second transistor T2; a first end of the eighth resistor R8 is electrically connected to a first end of the sixth resistor R6, and a second end of the eighth resistor R8 is electrically connected to a collector of the third transistor T3; the gate of the second MOS transistor Q2 is electrically connected to the first end of the seventh resistor R7, the source is electrically connected to the first end of the sixth resistor R6, and the drain is electrically connected to the motherboard 2; the base electrode of the second triode T2 is electrically connected with the negative electrode of the two electrodes D1, and the emitting electrode is grounded; the base of the third triode T3 receives the control signal Ctr, the collector is electrically connected to the anode of the second electrode D1, and the emitter is grounded.
Further, the second output module 13 further includes a third capacitor C3 and a fourth capacitor C4; a first end of the third capacitor C3 is electrically connected to a first end of the sixth resistor R6, and a second end is grounded; a first end of the fourth capacitor C4 is electrically connected to the drain of the second MOS transistor Q2, and a second end thereof is grounded. The third capacitor C3 and the fourth capacitor C4 are filter capacitors.
Specifically, in the embodiment of the present invention, the first resistor R1 is 24 kohms, the second resistor R2 is 1 kohms, the third resistor R3 is 10 kohms, and the on-voltage Vbe of the first transistor T1 is 0.7V;
as shown in fig. 3, when the power voltage Vc output from the power supply 3 to the power conversion circuit 1 is 24V, the base voltage of the first transistor is 0.96V, the first transistor T1 is turned on, and the voltage of the collector of the first transistor T1 is pulled down to 0, that is, the potential of the output control signal Ctr is 0, that is, the first potential is 0 potential.
As shown in fig. 3, when the power voltage Vc output from the power supply 3 to the power conversion circuit 1 is 12V, the base voltage of the first transistor is 0.48V, the first transistor T1 is turned off, the collector voltage of the first transistor T1 is 12V, that is, the potential of the output control signal Ctr is 12V, that is, the second potential is 12V.
Further, the fourth resistor R4 is 10 kilo-ohms, the fifth resistor R5 is 10 kilo-ohms, the first capacitor C1 is 1 μ F, the second capacitor is 10 μ F, the first MOS transistor is a P-type MOS transistor, and the P-type MOS transistor is turned on when the gate-source voltage is negative voltage.
As shown in fig. 3, when the power supply voltage Vc output by the power supply 3 to the power conversion circuit 1 is 24V, the control signal Ctr is 0 potential, the gate voltage of the first MOS transistor Q1 is equal to 12V, and the gate-source voltage of the first MOS transistor is negative 12V, so that the first MOS transistor is turned on, the 24V power supply voltage Vc is input into the voltage reduction unit J1, and is reduced to 12V by the voltage reduction unit J1, and then 12V reduced power supply voltage is generated and input into the main board 1 as the working voltage of the main board 1;
as shown in fig. 3, when the power supply voltage Vc output by the power supply 3 to the power conversion circuit 1 is 12V, the control signal Ctr is 12V, no current flows through the fourth resistor R4 and the fifth resistor R5, the gate voltage of the first MOS transistor Q1 is equal to 12V, and the gate-source voltage of the first MOS transistor is 0V, so that the first MOS transistor Q1 is turned off, the 12V power supply voltage Vc cannot be input into the voltage dropping unit J1 through the first MOS transistor Q1, and no voltage is output from the output terminal of the voltage dropping unit J1.
Further, the sixth resistor R6 is 10 kohms, the seventh resistor R7 is 10 kohms, the eighth resistor R8 is 10 kohms, the third capacitor C3 is 1 μ F, the fourth capacitor is 10 μ F, the second MOS transistor Q2 is a P-type MOS transistor, the P-type MOS transistor is turned on when the gate-source voltage of the P-type MOS transistor is negative voltage, and the diode D1 is a schottky diode.
As shown in fig. 3, when the power voltage Vc output from the power supply 3 to the power conversion circuit 1 is 24V, the control signal Ctr is 0 potential, the third transistor T3 is turned on, the collector voltage of the third transistor T3 is 0V, the diode D1 is biased in the reverse direction and is cut off, the second transistor T2 is cut off, the gate voltage of the second MOS transistor Q2 is 24V, the gate-source voltage of the second MOS transistor Q2 is 0, the second MOS transistor Q2 is cut off, and the 24V power voltage Vc cannot be input into the main board 1 through the second MOS transistor Q2;
as shown in fig. 3, when the power voltage Vc output from the power supply 3 to the power conversion circuit 1 is 12V, the control signal Ctr is 12V, the third transistor T3 is turned off, the collector voltage of the third transistor T3 is 12V, the diode D1 is biased in the forward direction and turned on, the second transistor T2 is turned on, the gate voltage of the second MOS transistor Q2 is 6V, the gate-source voltage of the second MOS transistor Q2 is negative 6V, the second MOS transistor Q2 is turned on, and the 12V power voltage Vc is input to the main board 1 through the second MOS transistor Q2 as the operating voltage of the main board 1.
Further, the main board 1 of the display panel driving apparatus of the present invention is electrically connected to the display panel 4, and is configured to provide the operating voltage of the main board 1 to the display panel 4 to drive the display panel 4 to operate, which corresponds to the above embodiment that the voltage of 12V is input into the display panel 4.
In summary, the present invention provides a display panel driving apparatus, which includes a power conversion circuit and a main board electrically connected to the power conversion circuit; the power conversion circuit comprises a detection control module, a first output module and a second output module, wherein the first output module and the second output module are electrically connected with the detection control module, the voltage value of power voltage can be identified by the detection control module, the first output module or the second output module is controlled to work according to the difference of the voltage values, the voltage input to the mainboard is consistent with the working voltage of the mainboard all the time, the mainboard can be matched with two different power supplies for use, the application range of the mainboard is expanded, and the control cost of a product is reduced.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (8)
1. A display panel driving device is characterized by comprising a power conversion circuit (1) and a main board (2) electrically connected with the power conversion circuit (1);
the power conversion circuit (1) comprises a detection control module (11), and a first output module (12) and a second output module (13) which are electrically connected with the detection control module (11);
the detection control module (11) is used for receiving a power supply voltage (Vc), generating a control signal (Ctr) of a first potential when the voltage value of the power supply voltage (Vc) is a first voltage value, and generating a control signal (Ctr) of a second potential different from the first potential when the voltage value of the power supply voltage (Vc) is a second voltage value, wherein the first voltage value is greater than the second voltage value;
the first output module (12) is used for receiving a power supply voltage (Vc) and a control signal (Ctr), carrying out voltage reduction processing on the power supply voltage (Vc) when the control signal (Ctr) is at a first potential, outputting the reduced power supply voltage (Vc) to the mainboard (2), and stopping outputting the voltage to the mainboard (2) when the control signal (Ctr) is at a second potential;
the second output module (13) is used for receiving a power supply voltage (Vc) and a control signal (Ctr), outputting the power supply voltage (Vc) to the mainboard (2) when the control signal (Ctr) is at a second potential, and stopping outputting the voltage to the mainboard (2) when the control signal (Ctr) is at a first potential; the detection control module (11) comprises: the circuit comprises a first resistor (R1), a second resistor (R2), a third resistor (R3) and a first triode (T1);
the first end of the first resistor (R1) receives a power supply voltage (Vc), and the second end of the first resistor (R1) is electrically connected with the first end of the second resistor (R2);
a second terminal of the second resistor (R2) is grounded;
the first end of the third resistor (R3) is electrically connected with the first end of the first resistor (R1), and the second end of the third resistor (R3) is electrically connected with the collector of the first triode (T1) and outputs a control signal (Ctr);
the base electrode of the first triode (T1) is electrically connected with the second end of the first resistor (R1), and the emitting electrode of the first triode is grounded;
the second output module (13) comprises: the transistor comprises a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8), a second MOS (metal oxide semiconductor) tube (Q2), a second triode (T2), a third triode (T3) and a diode (D1);
a first end of the sixth resistor (R6) receives the power supply voltage (Vc), and a second end of the sixth resistor (R6) is electrically connected with a first end of the seventh resistor (R7);
a second end of the seventh resistor (R7) is electrically connected with a collector of a second triode (T2);
a first end of the eighth resistor (R8) is electrically connected with a first end of the sixth resistor (R6), and a second end of the eighth resistor (R8) is electrically connected with a collector of the third triode (T3);
the grid electrode of the second MOS transistor (Q2) is electrically connected with the first end of the seventh resistor (R7), the source electrode of the second MOS transistor is electrically connected with the first end of the sixth resistor (R6), and the drain electrode of the second MOS transistor is electrically connected with the mainboard (2);
the base electrode of the second triode (T2) is electrically connected with the negative electrode of the diode (D1), and the emitting electrode of the second triode is grounded;
the base electrode of the third triode (T3) receives the control signal (Ctr), the collector electrode is electrically connected with the anode of the diode (D1), and the emitter electrode is grounded.
2. The display panel driving apparatus according to claim 1, wherein the first output module (12) comprises: a fourth resistor (R4), a fifth resistor (R5), a first MOS transistor (Q1) and a voltage reduction unit (J1);
a first end of the fourth resistor (R4) receives a power supply voltage (Vc), and a second end of the fourth resistor (R4) is electrically connected with a first end of the fifth resistor (R5);
a second end of the fifth resistor (R5) receives a control signal (Ctr);
the grid electrode of the first MOS transistor (Q1) is electrically connected with the first end of the fifth resistor (R5), the source electrode of the first MOS transistor is electrically connected with the first end of the fourth resistor (R4), and the drain electrode of the first MOS transistor is electrically connected with the input end of the voltage reduction unit (J1);
the output end of the voltage reduction unit (J1) is electrically connected with the mainboard (2).
3. The display panel driving apparatus according to claim 1, wherein the first output module (12) further comprises a first capacitor (C1) and a second capacitor (C2);
the first end of the first capacitor (C1) is electrically connected with the first end of the fourth resistor (R4), and the second end of the first capacitor is grounded;
the first end of the second capacitor (C2) is electrically connected with the drain electrode of the first MOS tube (Q1), and the second end is grounded.
4. The display panel driving apparatus according to claim 1, wherein the second output module (13) further comprises a third capacitor (C3) and a fourth capacitor (C4);
the first end of the third capacitor (C3) is electrically connected with the first end of the sixth resistor (R6), and the second end of the third capacitor is grounded;
the first end of the fourth capacitor (C4) is electrically connected with the drain electrode of the second MOS tube (Q2), and the second end is grounded.
5. The display panel driving apparatus according to claim 1, further comprising a power supply (3) electrically connected to the power conversion circuit (1), wherein the power supply (3) is configured to output a power supply voltage (Vc) to the power conversion circuit (1).
6. The display panel driving apparatus according to claim 1, wherein the step-down processing of the power supply voltage (Vc) by the first output module (11) is specifically: -dropping the supply voltage (Vc) from a first voltage value to a second voltage value.
7. The display panel driving apparatus according to claim 1, wherein the first potential is smaller than the second potential.
8. The display panel driving apparatus according to claim 1, wherein the first voltage value is 24V and the second voltage value is 12V.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811490351.XA CN109410868B (en) | 2018-12-06 | 2018-12-06 | Display panel driving device |
| PCT/CN2018/121857 WO2020113677A1 (en) | 2018-12-06 | 2018-12-18 | Display panel driving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811490351.XA CN109410868B (en) | 2018-12-06 | 2018-12-06 | Display panel driving device |
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| CN109410868A CN109410868A (en) | 2019-03-01 |
| CN109410868B true CN109410868B (en) | 2020-10-16 |
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| CN110635688B (en) * | 2019-09-24 | 2020-12-08 | 福州京东方光电科技有限公司 | Power supply circuit and display device |
| CN114120927B (en) | 2021-12-06 | 2023-03-28 | Tcl华星光电技术有限公司 | Backlight module and display device |
| CN114664269B (en) * | 2022-04-21 | 2023-07-28 | 京东方科技集团股份有限公司 | Working power supply conversion circuit, display driving plate and liquid crystal display |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100828923B1 (en) * | 2001-10-10 | 2008-05-13 | 엘지디스플레이 주식회사 | Prevention Circuit of Over Voltage and Surge Voltage |
| CN102129281B (en) * | 2010-01-20 | 2012-09-19 | 宏碁股份有限公司 | Dynamic regulation circuit and computer system with the same |
| CN202306373U (en) * | 2011-09-21 | 2012-07-04 | 深圳创维数字技术股份有限公司 | Direct current voltage-reducing and voltage-stabilizing circuit |
| CN102692967B (en) * | 2012-05-14 | 2014-04-23 | 江苏中科梦兰电子科技有限公司 | Computer mainboard circuit capable of supporting various power adapters |
| CN103531233B (en) * | 2012-07-03 | 2018-05-22 | 深圳市共进电子股份有限公司 | For the power-down protection circuit of flash memory and power down protection sequence circuit |
| TWI513155B (en) * | 2014-03-12 | 2015-12-11 | Sitronix Technology Corp | Power conversion system |
| CN104038207B (en) * | 2014-05-30 | 2017-10-17 | 华为技术有限公司 | A kind of switching circuit and electronic equipment |
| CN205751480U (en) * | 2016-05-19 | 2016-11-30 | 合肥惠科金扬科技有限公司 | A kind of display device and power driving circuit thereof |
| CN105788556B (en) * | 2016-05-20 | 2018-12-11 | 深圳市华星光电技术有限公司 | A kind of overvoltage crowbar and method, liquid crystal display drive circuit |
| CN105915052B (en) * | 2016-05-26 | 2018-01-09 | 深圳市华星光电技术有限公司 | DC voltage converting circuit and liquid crystal display device |
| CN206743466U (en) * | 2017-04-14 | 2017-12-12 | 深圳创维数字技术有限公司 | A kind of voltage adaptive power supply circuit and set top box |
| CN108566082B (en) * | 2018-02-08 | 2024-02-23 | 深圳市微电元科技有限公司 | Direct-current ATX power supply supporting multiple input voltages |
-
2018
- 2018-12-06 CN CN201811490351.XA patent/CN109410868B/en active Active
- 2018-12-18 WO PCT/CN2018/121857 patent/WO2020113677A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN109410868A (en) | 2019-03-01 |
| WO2020113677A1 (en) | 2020-06-11 |
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