CN108231027B - Low-power-consumption liquid crystal display device - Google Patents
Low-power-consumption liquid crystal display device Download PDFInfo
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- CN108231027B CN108231027B CN201810035097.8A CN201810035097A CN108231027B CN 108231027 B CN108231027 B CN 108231027B CN 201810035097 A CN201810035097 A CN 201810035097A CN 108231027 B CN108231027 B CN 108231027B
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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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)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides a low-power-consumption liquid crystal display device, which comprises a liquid crystal panel display unit, a driving circuit unit, a backlight unit and a power circuit module, wherein the driving circuit unit and the backlight unit are connected with the liquid crystal panel display unit; the power circuit module comprises a boost conversion unit, a buck conversion unit, a first charge pump unit and a second charge pump unit. The present invention reduces a channel voltage of a second transistor by reducing a charge amount of a capacitor voltage using a power supply Voltage (VCC) having a voltage value higher than a ground voltage in generating a gate low voltage. Therefore, power loss and heat generation of the power supply circuit due to generation of the channel voltage are reduced, and power consumption and heat generation amount of the system are reduced.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display, and particularly relates to a low-power-consumption liquid crystal display device.
Background
In recent years, liquid crystal display devices have been widely used in many fields, and continue to exhibit a rapidly increasing trend. Currently, the main advantages of liquid crystal display are low power driving, light weight, and thin profile. A liquid crystal display device in which a switching transistor is formed in each pixel distributed in a matrix form in a liquid crystal panel is now widely used. In such an active matrix type liquid crystal display device, a switching transistor is switched by applying a scanning pulse to a pixel in accordance with a voltage applied to a data line, thereby displaying a liquid crystal. Therefore, the power supply circuit needs to generate various voltages including the gate switch voltages VGH and VGL and other driving voltages required for normal operation of the circuit. Normally the VGL voltage generated by the charge pump circuit effects the turning off of the transistors on the panel as a negative charge pump circuit. The negative charge pump circuit adjusts a charging voltage of the capacitor by a switching operation of the transistor to generate the VGL voltage. When adjusting the voltage charged in the capacitor, the resistance Rds of the channel is adjusted so as to limit the current Ids of the channel and thus to make a voltage difference between the source and the drain of the transistor, i.e. the channel voltage Vds. Therefore, the channel voltage Vds is adjusted by adjusting the channel current Ids of the transistor, so that the charging voltage of the capacitor is the difference of the input voltage VIN minus the channel voltage Vds. However, in the above manner, a large amount of power consumption occurs in the transistor, resulting in a loss of energy.
Disclosure of Invention
The invention provides a low-power-consumption liquid crystal display device, which adopts a power circuit module to generate a gate low voltage to drive a liquid crystal panel, uses a power voltage higher than a grounding voltage in the process of generating the gate low voltage, and reduces the voltage amount charged in a capacitor, thereby reducing the overall power loss and heat generation.
The technical solution for realizing the purpose of the invention is as follows:
a low-power-consumption liquid crystal display device comprises a liquid crystal panel display unit, a driving circuit unit, a backlight unit and a power circuit module, wherein the driving circuit unit and the backlight unit are connected with the liquid crystal panel display unit;
the power supply circuit module comprises a boosting conversion unit, a voltage reduction conversion unit, a first charge pump unit and a second charge pump unit, the boosting conversion unit, the voltage reduction conversion unit, the first charge pump unit and the second charge pump unit are all connected with an input voltage VIN, the output end of the voltage reduction conversion unit is also connected with the input end of the second charge pump unit, the boosting conversion unit outputs a first power supply voltage VDD, the voltage reduction conversion unit outputs a second power supply voltage VCC for providing working voltage for the equipment chip and providing low voltage for the second charge pump unit, the first charge pump unit outputs a grid high voltage VGH, and the second charge pump unit outputs a grid low voltage VGL.
Further, the low power consumption liquid crystal display device of the present invention, the second charge pump unit includes a control unit, a switching unit, a capacitor C, a first diode D1 and a second diode D2; the control unit outputs a switching signal to the switching unit, one end of the switching unit is connected with the input voltage VIN, and the other end of the switching unit is grounded; a first electrode of the first diode D1 is connected with the output end of the second charge pump unit, a second electrode of the second diode D2 is connected with the output end of the buck conversion unit, and a second electrode of the first diode D1 and a first electrode of the second diode are connected with the contact point N2; a first electrode of the capacitor C is connected to the output of the switching unit and a second electrode of the capacitor C is connected to the contact point N2.
Further, in the low power consumption liquid crystal display device of the present invention, the switch unit includes a first transistor T1 and a second transistor T2, wherein a drain of the first transistor T1 is connected to the input voltage VIN, a source of the second transistor T2 is grounded, a gate of the first transistor T1 and a gate of the second transistor T2 are both connected to the output terminal of the control unit, a source of the first transistor T1 and a drain of the second transistor T2 are connected to a contact point N1, and a contact point N1 is connected to the first electrode of the capacitor C.
Further, in the low power consumption liquid crystal display device of the present invention, the step-up converting unit and the step-down converting unit use Pulse Width Modulation (PWM) to adjust and control the magnitude of the output voltage.
Further, in the low power consumption lcd device of the present invention, the first charge pump unit is a positive charge pump, and the second charge pump unit is a negative charge pump.
Further, the liquid crystal display device with low power consumption of the invention, the liquid crystal panel display unit comprises a grid signal line, a data signal line and a pixel unit matrix, wherein the grid signal line and the data signal line are orthogonal to each other, and the pixel unit matrix is connected with the grid signal line and the data signal line.
Further, the low power consumption liquid crystal display device of the present invention includes a pixel electrode, a common electrode, a liquid crystal capacitor Clc, a storage capacitor Cs, and a P-channel fet T, wherein a gate of the P-channel fet T is connected to a gate signal line GL, a source of the P-channel fet T is connected to a data signal line DL through the pixel electrode, a drain of the P-channel fet T is connected to both the liquid crystal capacitor Clc and the storage capacitor Cs, and the other end of the liquid crystal capacitor Clc and the other end of the storage capacitor Cs are connected to the common electrode.
Furthermore, the driving circuit unit of the low power consumption liquid crystal display device of the invention comprises a time sequence control unit, a grid driving unit, a data driving unit and a Gamma reference voltage unit, wherein the grid driving unit is connected with the first charge pump unit and the second charge pump unit, the data driving unit is connected with the boost conversion unit, the time sequence control unit is used for receiving an input video signal of an external device, outputting a first control signal GCS to the grid driving unit after processing, and outputting a second control signal DCS to the data driving unit; the Gamma reference voltage unit is used for generating a plurality of reference voltages Vgamma and outputting the reference voltages Vgamma to the data driving unit; the grid driving unit is used for receiving a first control signal GCS and outputting a grid high voltage signal VGH and a grid low voltage signal VGL to the liquid crystal panel display unit; the data driving unit is used for receiving a second control signal DCS and providing a data voltage to the data signal line.
Further, in the liquid crystal display device with low power consumption of the present invention, the backlight unit includes a Cold Cathode Fluorescent Lamp (CCFL) or an External Electrode Fluorescent Lamp (EEFL) or a Light Emitting Diode (LED).
Compared with the prior art, the invention adopts the technical scheme that the charging quantity of the capacitor voltage is reduced by using the power supply Voltage (VCC) with the voltage value higher than the grounding voltage in the process of generating the gate low voltage, so that the channel voltage of the second transistor is reduced. Therefore, power loss and heat generation of the power supply circuit due to generation of the channel voltage can be reduced, power consumption can be reduced, and the amount of heat generation of the system can be reduced.
Drawings
Fig. 1 is a schematic structural view of a low power consumption liquid crystal display device of the present invention;
FIG. 2 is a schematic diagram of a pixel unit of a low power consumption liquid crystal display device according to the present invention;
FIG. 3 is a schematic diagram of a power supply circuit module of the low power consumption LCD device according to the present invention;
fig. 4 is a schematic structural diagram of a second charge pump unit of the power circuit module of the low power consumption liquid crystal display device of the present invention.
Reference signs mean: 200: liquid crystal panel display unit, 400: power circuit module, 500: backlight unit, 310: timing control unit, 320: gate driving unit, 330: data driving unit, 340: gamma reference voltage unit, 410: boost conversion unit, 420: step-down conversion unit, 430: first charge pump unit, 440: second charge pump unit, 441: control unit, 442: a switch unit.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A low power consumption liquid crystal display device, as shown in FIG. 1, includes a liquid crystal panel display unit 200, a driving circuit unit, a backlight unit 500 and a power circuit module 400, wherein the driving circuit unit and the backlight unit 500 are connected with the liquid crystal panel display unit 200, and the power circuit module 400 is connected with the driving circuit unit;
as shown in fig. 3, the power circuit module 400 includes a boost converting unit 410, a buck converting unit 420, a first charge pump unit 430, and a second charge pump unit 440, the boost converting unit 410, the buck converting unit 420, the first charge pump unit 430, and the second charge pump unit 440 are all connected to an input voltage VIN, and an output terminal of the buck converting unit 420 is further connected to an input terminal of the second charge pump unit 440. The step-up converting unit 410 steps up the input voltage VIN to generate and output a first power voltage VDD, the step-down converting unit 420 steps down the input voltage VIN and outputs a second power voltage VCC for providing a working voltage for the device chip and a low voltage for the second charge pump unit 440, the first charge pump unit 430 is a positive charge pump that steps up the input VIN voltage through the switching of the transistor and the charging and discharging operation of the capacitor and outputs a gate high voltage VGH, the second charge pump unit 440 is a negative charge pump, and the second power voltage VCC steps down and outputs a gate low voltage VGL through the negative charge pump circuit. The first power voltage VDD and the second power voltage VCC serve as high level and low level voltages input to the Gamma reference voltage unit 340. The grid high voltage VGH is applied to the grid of the switch transistor through a grid signal line to realize conduction, and the grid low voltage VGL mainly realizes the turn-off of the switch transistor.
The voltage boosting and reducing of the voltage boosting converting unit 410 and the voltage reducing converting unit 420 are realized by charging and discharging follow current of an inductor, and the magnitude of the output voltage is adjusted and controlled by Pulse Width Modulation (PWM).
In one embodiment of the present invention, VCC is 3.3V when VIN is 12V.
As shown in fig. 4, the second charge pump unit 440 includes a control unit 441, a switching unit 442, a capacitor C, a first diode D1, and a second diode D2; the control unit 441 outputs a switching signal to the switching unit 442 to control the switching operation thereof, one end of the switching unit 442 is connected to the input voltage VIN, and the other end is grounded; a first electrode of the first diode D1 is connected to the output terminal of the second charge pump unit 440, a second electrode of the second diode D2 is connected to the output terminal of the buck conversion unit 420, and a second electrode of the first diode D1 and a first electrode of the second diode are connected to the contact point N2; a first electrode of the capacitor C is connected to the output terminal of the switching unit 442, and a second electrode of the capacitor C is connected to the contact point N2.
The switching unit 442 includes a first transistor T1 and a second transistor T2, wherein a drain of the first transistor T1 is connected to the input voltage VIN, a source of the second transistor T2 is grounded, a gate of the first transistor T1 and a gate of the second transistor T2 are both connected to the output terminal of the control unit 441, a source of the first transistor T1 and a drain of the second transistor T2 are connected to a contact point N1, and a contact point N1 is connected to the first electrode of the capacitor C.
The control unit 441 outputs a first switching signal S1 and a second switching signal S2, and the switching signals S1 and S2 are input to gates of the first transistor T1 and the second transistor T2, respectively, controlling switching operations of the first transistor T1 and the second transistor T2. When the first transistor T1 is turned on, the second transistor T2 is not completely turned off, i.e., the channel of the second transistor T2 is in a partially opened state. At this time, the channel of the second transistor T2 has a certain degree of channel resistance Rds. The control unit 441 controls the second transistor T2 such that the second transistor T2 has a predetermined channel resistance Rds when the first transistor T1 is turned on. In addition, by adjusting the second switching signal S2, the value of the channel resistance Rds can be adjusted, and the charging voltage of the capacitor C can be adjusted. When the first transistor T1 is turned off, the second transistor T2 is fully turned on. A first electrode of the first diode D1 is connected to the output terminal of the second charge pump unit 440, and a second electrode of the first diode D1 is connected to a second electrode of the capacitor C. The first electrode of the capacitor C is connected to the contact point N1 of the transistor. A first electrode of the second diode D2 is connected to a second electrode of the capacitor C. The second power supply voltage VCC is applied to the second electrode of the second diode D2, i.e., the second electrode of the second diode D2 is connected to the output terminal of the buck conversion unit 420 to receive the second power supply voltage VCC. The forward direction of the second diode D2 is the first electrode to second electrode direction. The capacitor C will be charged as described above and the gate low voltage VGL is generated by the charging voltage. The specific process is as follows: the control unit 441 turns on the first transistor T1, and controls the channel of the second transistor T2 to be partially turned on, at this time, the voltage of the first electrode of the capacitor C is the voltage of the first contact N1, i.e., the input voltage VIN minus the T2 channel voltage Vds, and the voltage of the second electrode of the capacitor C is VCC. Accordingly, when the first transistor T1 is turned on and the channel of the second transistor T2 is partially turned off, the voltage of the capacitor C is charged to (VIN-Vds-VCC). Then, the control unit 441 turns off the first transistor T1 and turns on the second transistor T2. At this time, the first electrode of the capacitor C is grounded via the second transistor T2. Since the voltage difference between the first and second electrodes of the capacitor C is maintained by the pre-charged voltage (VIN-Vds-VCC), the voltage of the second electrode of the capacitor C is- (VIN-Vds-VCC) — VIN + Vds + VCC. Therefore, the voltage of the gate low voltage VGL, which is the output terminal of the second charge pump unit 440, has an output value of VGL ═ Vd + (-VIN + Vds + VCC). And Vd is the forward voltage drop generated by the first secondary tube. Therefore, the voltage charged in the capacitor C can be adjusted by adjusting Vds, thereby adjusting the output value of the gate low voltage VGL. As described above, the second charge pump unit 440 converts the input voltage VIN into the gate-low voltage VGL, and the channel voltage Vds of the second transistor T2 may be reduced by using the second power supply voltage VCC in the generation of the gate-low voltage VGL. If the second electrode of the second diode D2 is grounded, VGL ═ Vd + (-VIN + Vds '), and Vds' is the channel voltage of the second transistor in this state. When Vd is constant, Vds' is Vds + VCC, and VCC is about 3.3V. Therefore, when the second power supply voltage VCC is applied to the second electrode of the second diode D2, the system may reduce a power loss of 3.3V, as compared to the case where the second electrode is grounded. Also, as the power loss decreases, the heat generation of the power circuit module 400 can be reduced. Therefore, as a result of experiments performed on the lcd device having the input voltage VIN of about 12V and the gate low voltage of about-5V to-7V, the temperature of the power circuit module 400 is reduced by about 3 c to 4 c when the second power voltage VCC is used. In summary, in the scheme of the present invention, by using the power supply voltage VCC having a voltage value higher than the ground voltage in generating the gate low voltage, the amount of voltage charged in the capacitor is reduced. Accordingly, the channel voltage of the second transistor can be reduced, so that power loss and heat generation due to generation of the channel voltage can be reduced.
The liquid crystal panel display unit 200 includes a gate signal line, a data signal line, and a pixel unit matrix, wherein the gate signal line and the data signal line are orthogonal to each other, and the pixel unit matrix is connected to both the gate signal line and the data signal line.
As shown in fig. 2, the pixel unit includes a pixel electrode, a common electrode, a liquid crystal capacitor Clc, a storage capacitor Cs, and a P-channel fet T, wherein a gate of the P-channel fet T is connected to a gate signal line GL, a source of the P-channel fet T is connected to a data signal line DL through a pixel electrode, a drain of the P-channel fet T is connected to both the liquid crystal capacitor Clc and the storage capacitor Cs, and the other end of the liquid crystal capacitor Clc and the other end of the storage capacitor Cs are connected to the common electrode. Under the control of a grid signal, the rotation angle of the liquid crystal molecules is controlled by electric fields formed by the pixel electrode and the common electrode which are respectively applied to the liquid crystal capacitor, and the display of a single liquid crystal pixel is realized. The storage capacitor is mainly used for keeping normal display of the previous line of images within one frame time when the grid driving signal is scanned line by line.
The driving circuit unit comprises a timing control unit 310, a gate driving unit 320, a data driving unit 330 and a Gamma reference voltage unit 340, wherein the gate driving unit 320 is connected with a first charge pump unit 430 and a second charge pump unit 440, the data driving unit 330 is connected with a boost conversion unit 410, the timing control unit 310 is used for receiving an input video signal of an external device, outputting a first control signal GCS to the gate driving unit after processing, and outputting a second control signal DCS to the data driving unit 330; the Gamma reference voltage unit 340 is configured to generate a plurality of reference voltages Vgamma and output the reference voltages Vgamma to the data driving unit 330; the gate driving unit 320 is configured to receive the first control signal GCS and output a gate high voltage signal VGH and a gate low voltage signal VGL to the liquid crystal panel display unit 200, so as to turn on and off the switching transistors line by line; the data driving unit 330 is configured to receive the second control signal DCS and supply a data voltage to the data signal line. The input Gamma reference voltage Vgamma is divided by a voltage dividing circuit to generate a gradation voltage corresponding to the image Data. When the image Data is n bits, 2^ n gray voltages are generated. The data driving unit 330 outputs a gray voltage corresponding to image data to a data signal line, and displays an image under the control of a gate signal.
The backlight unit 500 includes a Cold Cathode Fluorescent Lamp (CCFL) or an External Electrode Fluorescent Lamp (EEFL) or a Light Emitting Diode (LED).
The foregoing is directed to embodiments of the present invention and, more particularly, to a method and apparatus for controlling a power converter in a power converter, including a power converter, a power.
Claims (8)
1. The liquid crystal display equipment with low power consumption is characterized by comprising a liquid crystal panel display unit (200), a driving circuit unit, a backlight unit (500) and a power circuit module (400), wherein the driving circuit unit and the backlight unit (500) are connected with the liquid crystal panel display unit (200), and the power circuit module (400) is connected with the driving circuit unit;
the power circuit module (400) comprises a boost conversion unit (410), a buck conversion unit (420), a first charge pump unit (430) and a second charge pump unit (440), wherein the boost conversion unit (410), the buck conversion unit (420), the first charge pump unit (430) and the second charge pump unit (440) are all connected with an input voltage VIN, an output end of the buck conversion unit (420) is further connected with an input end of the second charge pump unit (440), the boost conversion unit (410) outputs a first power voltage VDD, the buck conversion unit (420) outputs a second power voltage VCC for providing a working voltage for the device chip and a low voltage for the second charge pump unit (440), the first charge pump unit (430) outputs a gate high voltage VGH, and the second charge pump unit (440) outputs a gate low voltage VGL; the second charge pump unit (440) comprises a control unit (441), a switch unit (442), a capacitor C, a first diode D1 and a second diode D2; the control unit (441) outputs a switching signal to the switching unit (442), one end of the switching unit (442) is connected with the input voltage VIN, and the other end of the switching unit (442) is grounded; a first electrode of the first diode D1 is connected with an output end of the second charge pump unit (440), a second electrode of the second diode D2 is connected with an output end of the buck conversion unit (420), and a second electrode of the first diode D1 and a first electrode of the second diode are connected with a contact point N2; a first electrode of the capacitor C is connected to the output of the switching unit (442) and a second electrode of the capacitor C is connected to the contact point N2.
2. The liquid crystal display device of low power consumption of claim 1, wherein the switching unit (442) comprises a first transistor T1 and a second transistor T2, wherein a drain of the first transistor T1 is connected to the input voltage VIN, a source of the second transistor T2 is grounded, a gate of the first transistor T1 and a gate of the second transistor T2 are both connected to the output terminal of the control unit (441), a source of the first transistor T1 and a drain of the second transistor T2 are connected to a contact N1, and a contact N1 is connected to the first electrode of the capacitor C.
3. The low power consumption liquid crystal display device of claim 1, wherein the step-up converting unit (410) and the step-down converting unit (420) use Pulse Width Modulation (PWM) to adjust and control the magnitude of the output voltage.
4. The low power consumption liquid crystal display device of claim 1, wherein the first charge pump unit (430) is a positive charge pump and the second charge pump unit (440) is a negative charge pump.
5. The low power consumption liquid crystal display device according to claim 1, wherein the liquid crystal panel display unit (200) includes a gate signal line, a data signal line, and a pixel cell matrix, wherein the gate signal line and the data signal line are orthogonal to each other, and the pixel cell matrix is connected to both the gate signal line and the data signal line.
6. The liquid crystal display device with low power consumption according to claim 5, wherein the pixel unit comprises a pixel electrode, a common electrode, a liquid crystal capacitor Clc, a storage capacitor Cs and a P-channel field effect transistor T, wherein a gate of the P-channel field effect transistor T is connected with a gate signal line GL, a source of the P-channel field effect transistor T is connected with a data signal line DL through the pixel electrode, a drain of the P-channel field effect transistor T is connected with both the liquid crystal capacitor Clc and the storage capacitor Cs, and the other end of the liquid crystal capacitor Clc and the other end of the storage capacitor Cs are connected with the common electrode.
7. The liquid crystal display device of claim 1, wherein the driving circuit unit comprises a timing control unit (310), a gate driving unit (320), a data driving unit (330), and a Gamma reference voltage unit (340), the gate driving unit (320) is connected to the first charge pump unit (430) and the second charge pump unit (440), and the data driving unit (330) is connected to the boost conversion unit (410), wherein the timing control unit (310) is configured to receive an input video signal of an external device, process the input video signal to output a first control signal GCS to the gate driving unit, and output a second control signal DCS to the data driving unit (330); the Gamma reference voltage unit (340) is used for generating a plurality of reference voltages Vgamma and outputting the reference voltages Vgamma to the data driving unit (330); the gate driving unit (320) is used for receiving the first control signal GCS and outputting a gate high voltage signal VGH and a gate low voltage signal VGL to the liquid crystal panel display unit (200); the data driving unit (330) is used for receiving the second control signal DCS and providing data voltage for the data signal line.
8. The liquid crystal display device with low power consumption of claim 1, wherein the backlight unit (500) comprises a Cold Cathode Fluorescent Lamp (CCFL) or an External Electrode Fluorescent Lamp (EEFL) or a Light Emitting Diode (LED).
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| CN201810035097.8A CN108231027B (en) | 2018-01-15 | 2018-01-15 | Low-power-consumption liquid crystal display device |
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| CN201810035097.8A CN108231027B (en) | 2018-01-15 | 2018-01-15 | Low-power-consumption liquid crystal display device |
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| CN109637486B (en) * | 2019-01-25 | 2021-05-25 | 昆山龙腾光电股份有限公司 | Display driving circuit and display driving method thereof |
| CN110071630A (en) * | 2019-05-30 | 2019-07-30 | 上海南芯半导体科技有限公司 | A kind of conversion circuit and implementation method of seamless switching decompression and straight-through operating mode |
| CN114844348B (en) * | 2021-02-02 | 2024-05-10 | 圣邦微电子（北京）股份有限公司 | Power supply circuit, display panel and display device |
| CN113824315B (en) * | 2021-10-20 | 2024-02-06 | 京东方科技集团股份有限公司 | Power supply generating circuit and display device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006338139A (en) * | 2005-05-31 | 2006-12-14 | Seiko Epson Corp | Reference clock generation circuit, power supply circuit, driving circuit and electrooptical device |
| CN101763829A (en) * | 2008-12-23 | 2010-06-30 | 比亚迪股份有限公司 | Device and method for reducing power consumption of driver for thin film transistor liquid crystal display (TFT LCD) |
| CN101958644A (en) * | 2009-07-16 | 2011-01-26 | 联咏科技股份有限公司 | Voltage generating device capable of preventing blocking phenomenon and method thereof |
| CN102214432A (en) * | 2010-12-10 | 2011-10-12 | 友达光电股份有限公司 | Power management and control module and liquid crystal display |
| CN102982776A (en) * | 2012-11-27 | 2013-03-20 | 深圳市华星光电技术有限公司 | Method for saving shunt capacitors through circuit board |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200416438A (en) * | 2003-02-13 | 2004-09-01 | Rohm Co Ltd | Power source device for driving a display device, and the display device |
-
2018
- 2018-01-15 CN CN201810035097.8A patent/CN108231027B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006338139A (en) * | 2005-05-31 | 2006-12-14 | Seiko Epson Corp | Reference clock generation circuit, power supply circuit, driving circuit and electrooptical device |
| CN101763829A (en) * | 2008-12-23 | 2010-06-30 | 比亚迪股份有限公司 | Device and method for reducing power consumption of driver for thin film transistor liquid crystal display (TFT LCD) |
| CN101958644A (en) * | 2009-07-16 | 2011-01-26 | 联咏科技股份有限公司 | Voltage generating device capable of preventing blocking phenomenon and method thereof |
| CN102214432A (en) * | 2010-12-10 | 2011-10-12 | 友达光电股份有限公司 | Power management and control module and liquid crystal display |
| CN102982776A (en) * | 2012-11-27 | 2013-03-20 | 深圳市华星光电技术有限公司 | Method for saving shunt capacitors through circuit board |
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|---|---|
| CN108231027A (en) | 2018-06-29 |
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