CN209947403U - Drive control circuit board for large-size thin film liquid crystal display - Google Patents
Drive control circuit board for large-size thin film liquid crystal display Download PDFInfo
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- CN209947403U CN209947403U CN201920725586.6U CN201920725586U CN209947403U CN 209947403 U CN209947403 U CN 209947403U CN 201920725586 U CN201920725586 U CN 201920725586U CN 209947403 U CN209947403 U CN 209947403U
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Abstract
A large-size thin film liquid crystal display driving control circuit board comprises a direct current power supply conversion module, a time sequence control module, an image gray correction control module, a column scanning driving module and a line scanning driving module; the direct-current power supply conversion module is respectively connected with the time sequence control module, the image gray correction control module, the column scanning driving module and the row scanning driving module; the direct-current power supply conversion module comprises a chip IC4002, and pins 26, 1, 2 and 8 of the IC4002 are connected with a vin _12V input end; the time sequence control module is connected with the image gray correction control module and is simultaneously connected with the column scanning driving module and the row scanning driving module respectively; the utility model has reasonable design, safety and reliability, and ensures that the voltage required by each control part is more stable and the color output visual effect of the large screen is better; the service life of the transformer is prevented from being reduced due to unstable voltage, and the use cost is reduced; meanwhile, the visual fatigue is relieved, and the visual comfort is improved.
Description
Technical Field
The utility model relates to a LCD screen driven field especially relates to a jumbo size film LCD screen drive control circuit board.
Background
More and more large-screen thin-film liquid crystal screens enter the daily life of people, and the voltage stability required by each control part output by the design of a large-size liquid crystal screen driving circuit in the prior art is not high, so that the electric elements can be damaged, the service life of a circuit board is shortened, and the use cost is increased; the voltage instability also affects the image gradation, and easily causes eye fatigue.
Disclosure of Invention
The utility model aims at providing a jumbo size film LCD screen drive control circuit board, output voltage is stable, and long service life has solved above technical problem.
In order to realize the technical purpose, reach foretell technical requirement, the utility model discloses the technical scheme who adopts is: a drive control circuit board for a large-size film liquid crystal display screen is characterized in that: the system comprises a direct-current power supply conversion module, a time sequence control module, an image gray correction control module, a column scanning driving module and a row scanning driving module; the direct-current power supply conversion module is respectively connected with the time sequence control module, the image gray correction control module, the column scanning driving module and the row scanning driving module; the direct-current power supply conversion module comprises a chip IC4002, and pins 26, 1, 2 and 8 of the IC4002 are connected with a vin _12V input end to form 12V working voltage; the time sequence control module is connected with the image gray correction control module and is simultaneously respectively connected with the column scanning driving module and the row scanning driving module.
Preferably: the vin _12V end is connected in two paths, and one path is connected with a pin 2 of a voltage correction chip IC4001 through a resistor R4004; the other path is connected with VREG-5V through a resistor R4006, a field effect transistor FET4001 and a field effect transistor FET4002 in sequence; the drain electrode of the field effect transistor FET4001 is connected with a resistor R4009, the grid electrode is connected in two paths, one path is connected with a resistor R4008, and the other path is connected with a pin 1 of a voltage correction chip IC 4001; the pin 28 of the chip IC4002 is divided into two paths, one path is grounded after passing through a resistor R4019 and a capacitor C4018, and the other path is connected with HVLS8.4V through an inductor L4001; a pin 30 of the chip IC4002 is connected with HVLS8.4V, a capacitor C4015, a capacitor C4016 and a capacitor C4019 are arranged in parallel, the source electrode of the FET4005 is grounded, and the drain electrode of the FET4003 is connected in series; a pin 33 and a pin 34 of the chip IC4002 are connected with an inductor L4002 in parallel, then connected with a capacitor C4027, a capacitor C4028 and a capacitor C4030 in parallel, and then connected with a resistor R4033 and a resistor R4035 in parallel and then connected with VCC1.0V; the 38 pin of the chip IC4002 is divided into two paths to be connected, one path is connected with the fly-wheel diode D4006 and then grounded, the other path is connected with the inductor L4004 and the resistor R4048 and then divided into two paths to be connected, one path is grounded after passing through the resistor R4050, and the other path is connected with VCC3.3V; a pin 38 of the chip IC4002 is connected out in one way, connected with the capacitor C4025 and the capacitor C4026 in parallel, then connected with the field effect transistor FET4006 in series and connected to the VGL-6V end; one path of a pin 17 of the chip IC4002 is connected with vin12V after passing through an inductor L4003, and the other path is grounded after passing through a capacitor C4031; a 23 pin of the chip IC4002 is connected with a capacitor C4012 and a capacitor C4013 in parallel and then is connected with a triode in series, an emitting electrode of the triode is divided into two paths, one path is connected with a diode D4002, and the other path is connected with a VGH35V end;
preferably: the image gray scale correction module comprises a connector CN1001, and the time sequence control module comprises a programming chip IC 3004; the connector CN1001 is connected to the microprocessor IC2001 via eight sets of differential inputs.
The utility model has the advantages that; a large-size film liquid crystal display drive control circuit board compares with traditional structure: the circuit is provided with a field effect transistor FET4001 and a field effect transistor FET4002 which play a role of voltage stabilization, a voltage correction IC4001, a resistor R4008 and a resistor R4009 form a feedback circuit, the voltage is continuously adjusted, and the voltage output is ensured to stably reach the designed VREG-5V voltage; pins 33 and 34 of the chip IC4002 are connected with an L4002 inductor in parallel, and then filtered through a capacitor C4027, a capacitor C028 and a capacitor C4030; then the resistor R4033 and the resistor R4035 are connected in parallel, so that the current can be limited and a stable 1.0V power supply can be output to the main chip; the resistor R4048, the resistor R4050 and VCC _3.3V form a negative feedback circuit, so that the power supply chip can automatically adjust the duty ratio of PWM; the utility model has reasonable design, safety and reliability, ensures that the voltage required by each control part is more stable, can continuously regulate and control the difference value between the preset voltage and the actual voltage in the column scanning driving and the line scanning driving, and ensures that the color output visual effect of a large screen is better; the service life of the transformer is prevented from being reduced due to unstable voltage, and the use cost is reduced; meanwhile, the visual fatigue is relieved, and the visual comfort is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a voltage reduction circuit diagram of VREG _5V of the present invention;
FIG. 3 is a voltage step-down circuit diagram of HVLS8.4V of the present invention;
fig. 4 is a voltage step-down circuit diagram of VCC _1.0V of the present invention;
fig. 5 is a voltage step-down circuit diagram of VCC _3.3V of the present invention;
FIG. 6 is a voltage reduction circuit diagram of VGL-6V of the present invention;
FIG. 7 is a voltage boosting circuit diagram of the present invention with 15.6V;
fig. 8 is a voltage boost circuit diagram of VGH35V according to the present invention;
fig. 9 is a schematic connection diagram of a connector CN1001 according to the present invention;
FIG. 10 is a schematic diagram of the connection of the chip IC2001 according to the present invention;
FIG. 11 is a schematic diagram of the connection of the chip IC3004 according to the present invention;
fig. 12 is a schematic diagram of the connection of the chip IC1001 according to the present invention;
fig. 13 is a schematic diagram of the chip IC4002 of the present invention;
in the figure: 1. a DC power supply conversion module; 2. a timing control module; 3. an image gray scale correction control module; 4. column scanning driving; 5. and (5) line scanning driving.
Detailed Description
In order to make the object, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments;
in the drawings: a drive control circuit board for a large-size film liquid crystal display screen is characterized in that: the system comprises a direct current power supply conversion module 1, a time sequence control module 2, an image gray correction control module 3, a column scanning driving module 4 and a row scanning driving module 5; the direct current power supply conversion module 1 is respectively connected with the time sequence control module 2, the image gray correction control module 3, the column scanning driving module 4 and the row scanning driving module 5; the direct-current power supply conversion module 1 comprises a chip IC4002, and pins 26, 1, 2 and 8 of the IC4002 are connected with a vin _12V input end to form 12V working voltage; the time sequence control module 2 is connected with the image gray correction control module 3, and is respectively connected with the column scanning driving module 4 and the row scanning driving module 5.
The vin _12V end is connected in two paths, and one path is connected with a pin 2 of a voltage correction chip IC4001 through a resistor R4004; the other path is connected with VREG-5V through a resistor R4006, a field effect transistor FET4001 and a field effect transistor FET4002 in sequence; the drain electrode of the field effect transistor FET4001 is connected with a resistor R4009, the grid electrode is connected in two paths, one path is connected with a resistor R4008, and the other path is connected with a pin 1 of a voltage correction chip IC 4001; the pin 28 of the chip IC4002 is divided into two paths, one path is grounded after passing through a resistor R4019 and a capacitor C4018, and the other path is connected with HVLS8.4V through an inductor L4001; a pin 30 of the chip IC4002 is connected with HVLS8.4V, a capacitor C4015, a capacitor C4016 and a capacitor C4019 are arranged in parallel, the source electrode of the FET4005 is grounded, and the drain electrode of the FET4003 is connected in series; a pin 33 and a pin 34 of the chip IC4002 are connected with an inductor L4002 in parallel, then connected with a capacitor C4027, a capacitor C4028 and a capacitor C4030 in parallel, and then connected with a resistor R4033 and a resistor R4035 in parallel and then connected with VCC1.0V; the 38 pin of the chip IC4002 is divided into two paths to be connected, one path is connected with the fly-wheel diode D4006 and then grounded, the other path is connected with the inductor L4004 and the resistor R4048 and then divided into two paths to be connected, one path is grounded after passing through the resistor R4050, and the other path is connected with VCC3.3V; a pin 38 of the chip IC4002 is connected out in one way, connected with the capacitor C4025 and the capacitor C4026 in parallel, then connected with the field effect transistor FET4006 in series and connected to the VGL-6V end; one path of a pin 17 of the chip IC4002 is connected with vin12V after passing through an inductor L4003, and the other path is grounded after passing through a capacitor C4031; a 23 pin of the chip IC4002 is connected with a capacitor C4012 and a capacitor C4013 in parallel and then is connected with a triode in series, an emitting electrode of the triode is divided into two paths, one path is connected with a diode D4002, and the other path is connected with a VGH35V end; the image gray scale correction module comprises a connector CN1001, and the time sequence control module comprises a programming chip IC 3004; the connector CN1001 is connected to the microprocessor IC2001 via eight sets of differential inputs.
The utility model discloses a concrete implementation: the direct current power supply is converted to provide the voltage required by each control part; the time sequence control converts the input video screen signal into a digital signal, the drive control is connected with the image gray scale correction control, and the column scanning drive is controlled and controlled continuously; and the difference value between a preset power supply and an actual voltage in the line scanning drive realizes the color output of a large screen.
Generating voltages used by 7 sets of systems through a 12V power input IC 4002; the pressure reduction is respectively as follows: VREG-5V, HVLS8.4V, VCC-1.0V, VCC-3.3V, VGL-6V, the boost pressure is: 15.6V and VGH35V;
the Vin12V input is reduced in voltage through the resistor R4006, and then 5V voltage is output through the FET4001 and the FET4002 crystal voltage stabilization, in order to ensure that the output 5V voltage is stable and has no deviation, the circuit uses a feedback circuit consisting of the voltage correction IC4001, the resistor R4008 and the resistor R4009 to continuously adjust the voltage generated by 5V, and ensures that the voltage output stably reaches the designed VREG-5V voltage;
HVLS8.4V is VIN12V power, passes through IC4002, passes through pins 28, 30 output, connect FET4003, R4019, C4018, L4001, C4016, C4019, C4015, R4018, R4020, auxiliary power that R4023 forms and realize the high-efficient power switching function; the pins 28 and 30 of the IC4002 output voltage signals to rapidly charge C4015, C4016 and C4019, and when C4015, C4016 and C4019 are fully charged, the voltage at two ends is equal to the input voltage, so that the FET4003 is ensured to be fully conducted; when the PWM high-low pulse signal is transmitted through the FET4005, the FET4003 plays a role of fast switching, and the voltage control of the liquid crystal screen is started;
1.0V is that VIN12V power passes through IC4002, pin 33 and pin 34 of IC4002 are connected with L4002 inductor in parallel, and then filtered by three capacitors of C4027, C028 and C4030; then, the R4033 and the R4035 are connected in parallel to output a stable 1.0V power supply to the main chip in a current-limiting manner;
a pin 37 and a pin 38 of a power chip IC4003 generate PWM signals with the frequency of about 100 KHz, the PWM signals are output to an inductor L4004 and repeatedly charge the inductor L4004, 3.3V voltage is generated after the inductor L4004 discharges, D4006 is a freewheeling diode and is used for ensuring 3.3V output current, negative feedback voltage generated by a negative feedback circuit consisting of R4048, R4050 and VCC _3.3V is fed back to the power chip IC4003, and therefore the power chip IC4003 automatically adjusts the duty ratio of PWM and ensures 3.3V stable output
VGL-6V is a negative voltage output by the 20 th pin of the IC4002, and C4025 and C4026 are connected in parallel to filter a stable voltage; then, the FET4006 is connected for power amplification, and the signal is directly connected to the liquid crystal screen;
the input VIN-12V voltage of the pin of the IC 400217 is filtered by the C4031, then is connected to the L4003 to be boosted, is boosted to 15.6V by the freewheel diode, is input to the pin of the IC 400217, and is processed in the IC4002, and the pin 18 is output, 15.6V is directly input to the VLS, and the VLS is directly input to the liquid crystal screen.
The IC 400223 pin is connected with C4012 and C4013 in parallel for filtering, and then connected with Q4001 and D4002 to cooperate to boost to generate VGH35V voltage.
The working principle of the image gray scale correction control and the time sequence control is as follows, an external signal is input into a connector CN1001, and the connector has the differential inputs of groups VX1_ N0/VX 1_ P0, VX1_ N1/VX 1_ P1, VX1_ N2/VX 1_ P2, VX1_ N3/VX 1_ P3, VX1_ N4/VX 1_ P4, VX1_ N5/VX 1_ P5, VX1_ N6/VX 1_ P6 and VX1_ N7/VX 1_ P78; these signals to the outside are sent to the microprocessor IC 2001; VX1_ N0 is connected with an IC2001 pin 55; VX1_ P0 is connected with IC2001 pin 56; VX1_ N1 is connected with an IC2001 pin 57; VX1_ P1 is connected with IC2001 pin 58; VX1_ N2 is connected with an IC2001 pin 60; VX1_ P2 is connected with IC2001 pin 61; VX1_ N3 is connected with IC2001 pin 62; VX1_ P3 is connected with IC2001 pin 63; VX1_ N4 is connected with an IC2001 pin 65; VX1_ P4 is connected with IC2001 pin 66; VX1_ N5 is connected with an IC2001 pin 67; VX1_ P5 is connected with an IC2001 pin 68; VX1_ N6 is connected with an IC2001 pin 70; VX1_ P6 is connected with an IC2001 pin 71; VX1_ N7 is connected with an IC2001 pin 72; the VX1_ P7 is connected with the IC2001 pin 73, and power amplification is not carried out between the output signal of the IC2001 and the liquid crystal panel, but the output signal is directly driven.
And the image gray correction control is used for controlling the color of the liquid crystal screen. IC3004 is a programmable chip, a programmer can read values in registers in the IC3004 chip; after being programmed, the chip IC3004 can convert 15.6V analog input voltage into different voltage values such as 14V (OUT1)13V 12V … … 3V 2V 1V (OUT14) and the like through digital-to-analog conversion after being electrified, and the conversion is realized by chip pins;
the timing control is continuously adjusted, and then signals are output to the liquid crystal screen at pins 1-7 and pins 18-24 of the IC 3004. The microprocessor IC2001 controls the timing sequence to oscillate its internal crystal oscillator, and the microprocessor IC2001 needs to read the preset voltage in the external EPROM programmer IC1001, and calculates the actual voltage in the column scanning driving and the line scanning driving, respectively, to continuously adjust the voltage drop in the image gray scale correction control, thereby realizing the color correction and output of the liquid crystal display.
The foregoing examples are given for the purpose of illustrating the present invention in a clear and non-restrictive manner, and it will be apparent to those skilled in the art that variations and modifications of the present invention may be made in other variations and modifications based on the foregoing description, and it is not necessary or necessary to exhaustively enumerate all embodiments, and all such variations and modifications as are obvious and desirable in the art are within the scope of the present invention.
Claims (3)
1. A drive control circuit board for a large-size film liquid crystal display screen is characterized in that: the device comprises a direct-current power supply conversion module (1), a time sequence control module (2), an image gray correction control module (3), a column scanning driving module (4) and a row scanning driving module (5); the direct-current power supply conversion module (1) is respectively connected with the time sequence control module (2), the image gray correction control module (3), the column scanning driving module (4) and the row scanning driving module (5); the direct-current power supply conversion module (1) comprises a chip IC4002, and pins 26, 1, 2 and 8 of the IC4002 are connected with a vin _12V input end to form 12V working voltage; the time sequence control module (2) is connected with the image gray correction control module (3) and is simultaneously respectively connected with the column scanning driving module (4) and the row scanning driving module (5).
2. The large-sized thin film liquid crystal panel driving control circuit board according to claim 1, wherein: the vin _12V end is connected in two paths, and one path is connected with a pin 2 of a voltage correction chip IC4001 through a resistor R4004; the other path is connected with VREG-5V through a resistor R4006, a field effect transistor FET4001 and a field effect transistor FET4002 in sequence; the drain electrode of the field effect transistor FET4001 is connected with a resistor R4009, the grid electrode is connected in two paths, one path is connected with a resistor R4008, and the other path is connected with a pin 1 of a voltage correction chip IC 4001; the pin 28 of the chip IC4002 is divided into two paths, one path is grounded after passing through a resistor R4019 and a capacitor C4018, and the other path is connected with HVLS8.4V through an inductor L4001; a pin 30 of the chip IC4002 is connected with HVLS8.4V, a capacitor C4015, a capacitor C4016 and a capacitor C4019 are arranged in parallel, the source electrode of the FET4005 is grounded, and the drain electrode of the FET4003 is connected in series; a pin 33 and a pin 34 of the chip IC4002 are connected with an inductor L4002 in parallel, then connected with a capacitor C4027, a capacitor C4028 and a capacitor C4030 in parallel, and then connected with a resistor R4033 and a resistor R4035 in parallel and then connected with VCC1.0V; the 38 pin of the chip IC4002 is divided into two paths to be connected, one path is connected with the fly-wheel diode D4006 and then grounded, the other path is connected with the inductor L4004 and the resistor R4048 and then divided into two paths to be connected, one path is grounded after passing through the resistor R4050, and the other path is connected with VCC3.3V; a pin 38 of the chip IC4002 is connected out in one way, connected with the capacitor C4025 and the capacitor C4026 in parallel, then connected with the field effect transistor FET4006 in series and connected to the VGL-6V end; one path of a pin 17 of the chip IC4002 is connected with vin12V after passing through an inductor L4003, and the other path is grounded after passing through a capacitor C4031; a23-pin of the chip IC4002 is connected with a capacitor C4012 and a capacitor C4013 in parallel and then is connected with a triode in series, an emitting electrode of the triode is divided into two paths, one path is connected with a diode D4002, and the other path is connected with a VGH35V end.
3. The large-sized thin film liquid crystal panel driving control circuit board according to claim 1, wherein: the image gray scale correction module comprises a connector CN1001, and the time sequence control module comprises a programming chip IC 3004; the connector CN1001 is connected to the microprocessor IC2001 via eight sets of differential inputs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920725586.6U CN209947403U (en) | 2019-05-21 | 2019-05-21 | Drive control circuit board for large-size thin film liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920725586.6U CN209947403U (en) | 2019-05-21 | 2019-05-21 | Drive control circuit board for large-size thin film liquid crystal display |
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| CN209947403U true CN209947403U (en) | 2020-01-14 |
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| CN201920725586.6U Active CN209947403U (en) | 2019-05-21 | 2019-05-21 | Drive control circuit board for large-size thin film liquid crystal display |
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