CN108231027A - A kind of liquid crystal display of low-power consumption - Google Patents
A kind of liquid crystal display of low-power consumption Download PDFInfo
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- CN108231027A CN108231027A CN201810035097.8A CN201810035097A CN108231027A CN 108231027 A CN108231027 A CN 108231027A CN 201810035097 A CN201810035097 A CN 201810035097A CN 108231027 A CN108231027 A CN 108231027A
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Classifications
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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
Abstract
The present invention proposes the liquid crystal display of low-power consumption, including LCD panel display unit, drive circuit unit, back light unit and power circuit block, drive circuit unit and back light unit are connect with LCD panel display unit, and power circuit block is connect with drive circuit unit；Wherein, power circuit block includes boost conversion unit, decompression converting unit, the first charge pump unit and the second charge pump unit.The present invention using the supply voltage (VCC) with the voltage value higher than ground voltage in grid low-voltage is generated by reducing the charge volume of capacitance voltage, so as to reduce the channel voltage of second transistor.Therefore, it reduces since the generation of channel voltage causes power loss and the fever of power circuit, and reduces power consumption and reduce the calorific value of system.
Description
Technical field
The invention belongs to technical field of liquid crystal display, especially a kind of liquid crystal display of low-power consumption.
Background technology
In recent years, liquid crystal display suffers from being widely applied in numerous areas, and continues to present quickly growth
Trend.At present, the advantages that major advantage of liquid crystal reality drives for low-power, is frivolous, light-weight.It is distributed in liquid in the matrix form
The liquid crystal display device that switching transistor is formed in each pixel in crystal panel is widely used now.In this active matrix
In type liquid crystal display device, by the way that scanning pulse is added to realize, switching transistor switchs and coordinates the voltage that data line applies to pixel
On, realize the display of liquid crystal.Therefore power unit circuit need generate multiple voltage include gate switch voltage VGH and VGL with
And the driving voltage needed for other circuit normal works.The VGL voltages that usual charge pump circuit generates realize crystal on panel
The shutdown of pipe is negative charge pump circuit.Negative charge pump circuit by the switching manipulation of transistor come adjust the charging voltage of capacitance come
Generate VGL voltages.In the voltage to charge in adjusting capacitor, adjusting the resistance Rds of channel makes to get the electric current of limiting channel
There are voltage differences, i.e. channel voltage Vds so as to make between the source electrode and drain electrode of transistor by Ids.Therefore, by adjusting transistor
Channel current Ids adjusts channel voltage Vds, so as to which the charging voltage of capacitance be made to subtract channel voltage Vds for input voltage VIN
Difference.But adopt in manner just described, since a large amount of power consumption can be generated in the transistor, lead to the loss of energy.
Invention content
Technical problem solved by the invention is to provide a kind of liquid crystal display of low-power consumption, using power circuit mould
Block generates grid low-voltage to drive liquid crystal display panel, is used during grid low-voltage is generated with the electricity higher than ground voltage
Source voltage reduces the voltage to charge in the capacitor, so as to reduce whole power loss and fever.
Realize the object of the invention technical solution be：
A kind of liquid crystal display of low-power consumption, including LCD panel display unit, drive circuit unit, back light unit and
Power circuit block, drive circuit unit and back light unit are connect with LCD panel display unit, and power circuit block is with driving
Dynamic circuit unit connection；
Wherein, power circuit block includes boost conversion unit, decompression converting unit, the first charge pump unit and the second electricity
Lotus pump unit, boost conversion unit, decompression converting unit, the first charge pump unit and the second charge pump unit are and input voltage
VIN connections are depressured input terminal of the output terminal of converting unit also with the second charge pump unit and connect, boost conversion unit output the
One supply voltage VDD, decompression converting unit output second source voltage VCC, for providing operating voltage for device chip and being
Second charge pump unit provides low-voltage, the first charge pump unit output gate high-voltage VGH, the second charge pump unit output grid
Extremely low voltage VGL.
Further, the liquid crystal display of low-power consumption of the invention, second charge pump unit include control unit,
Switch unit, capacitance C, the first diode D1 and the second diode D2；Control unit output switching signal is to switch unit, switch
Unit one end is connect with input voltage VIN, other end ground connection；The first electrode of first diode D1 and the second charge pump unit
Output terminal connects, and the second electrode of the second diode D2 is connect with the output terminal of decompression converting unit, and the of the first diode D1
The first electrode of two electrodes and the second diode is connected in contact point N2；The first electrode of capacitance C and the output terminal of switch unit
It is connected, the second electrode of capacitance C is connected with contact point N2.
Further, the liquid crystal display of low-power consumption of the invention, switch unit include the first transistor T1 and second
Transistor T2, wherein, the drain electrode of the first transistor T1 is connect with input voltage VIN, the source electrode ground connection of second transistor T2, and first
The grid of transistor T1 and the grid of second transistor T2 are connect with the output terminal of control unit, the source electrode of the first transistor T1
Drain electrode with second transistor T2 is connected in contact point N1, the first electrode of contact point N1 connection capacitances C.
Further, the liquid crystal display of low-power consumption of the invention, the boost conversion unit, decompression converting unit are adopted
The size for being adjusted with pulse width modulation (PWM) and being controlled output voltage.
Further, the liquid crystal display of low-power consumption of the invention, simple eye first charge pump is positive charge pump, the
Two charge pump units are negative charge pump.
Further, the liquid crystal display of low-power consumption of the invention, the LCD panel display unit are believed including grid
Number line, data signal line and matrix of pixel cells, wherein, gate line and data signal line are mutually orthogonal, pixel unit square
Battle array is all connected with gate line, data signal line.
Further, the liquid crystal display of low-power consumption of the invention, the pixel unit include pixel electrode, common electrical
Pole, liquid crystal capacitance Clc, storage capacitance Cs and P-channel field-effect transistor (PEFT) pipe T, wherein, the grid and grid signal of P-channel field-effect transistor (PEFT) pipe T
Line GL connections, the source electrode of P-channel field-effect transistor (PEFT) pipe T are connect by pixel electrode with data signal line DL, P-channel field-effect transistor (PEFT) pipe T's
Drain electrode be all connected with liquid crystal capacitance Clc, storage capacitance Cs, the other end of liquid crystal capacitance Clc, the other end of storage capacitance Cs with
Public electrode connects.
Further, the liquid crystal display of low-power consumption of the invention, drive circuit unit include timing control unit, grid
Pole driving unit, data drive unit and Gamma reference voltage units, drive element of the grid and the first charge pump unit, second
Charge pump unit connects, and data drive unit is connect with boost conversion unit, wherein, timing control unit sets for receiving outside
Standby incoming video signal exports first control signal GCS to drive element of the grid after treatment, and exports the second control letter
Number DCS is to data drive unit；Gamma reference voltage units are used to generate multiple reference voltage Vgamma, and export to data
Driving unit；Drive element of the grid is used to receive first control signal GCS and exports gate high-voltage signal VGH and the low electricity of grid
Signal VGL is pressed to LCD panel display unit；Data drive unit is for receiving second control signal DCS and to data signal line
Data voltage is provided.
Further, the liquid crystal display of low-power consumption of the invention, back light unit include cold-cathode fluorescence lamp (CCFL)
Or external electrode fluorescent lamp (EEFL) or light emitting diode (LED).
Using above technical scheme compared with prior art, the present invention in grid low-voltage is generated by using by the present invention
The charge volume of capacitance voltage is reduced with the supply voltage (VCC) of the voltage value higher than ground voltage, so as to reduce the second crystalline substance
The channel voltage of body pipe.Therefore, it can reduce since the generation of channel voltage causes power loss and the fever of power circuit, it can
With the calorific value for reducing power consumption and reducing system.
Description of the drawings
Fig. 1 is that the low power consumption liquid crystal of the present invention shows the structure diagram of equipment；
Fig. 2 is the structure diagram that the low power consumption liquid crystal of the present invention shows the pixel unit of equipment；
Fig. 3 is the structure diagram that the low power consumption liquid crystal of the present invention shows the power circuit block of equipment；
Fig. 4 is that the structure for the second charge pump unit that the low power consumption liquid crystal of the present invention shows the power circuit block of equipment is shown
It is intended to.
Reference numeral meaning：200：LCD panel display unit, 400：Power circuit block, 500：Back light unit, 310：
Timing control unit, 320：Drive element of the grid, 330：Data drive unit, 340：Gamma reference voltage units, 410：Boosting
Converting unit, 420：Decompression converting unit, 430：First charge pump unit, 440：Second charge pump unit, 441：Control unit,
442：Switch unit.
Specific embodiment
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning
Same or similar element is represented to same or similar label eventually or there is the element of same or like function.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
A kind of liquid crystal display of low-power consumption, as shown in Figure 1, including LCD panel display unit 200, driving circuit list
Member, back light unit 500 and power circuit block 400, drive circuit unit and back light unit 500 are and LCD panel display unit
200 connections, power circuit block 400 are connect with drive circuit unit；
Wherein, power circuit block 400 is the supply unit that driving voltage is provided for liquid crystal display, as shown in figure 3,
Power circuit block 400 includes boost conversion unit 410, decompression converting unit 420, the first charge pump unit 430 and the second electricity
Lotus pump unit 440, boost conversion unit 410, decompression converting unit 420, the first charge pump unit 430 and the second charge pump unit
440 connect with input voltage VIN, and the output terminal for being depressured converting unit 420 also connects with the input terminal of the second charge pump unit 440
It connects.Boost conversion unit 410 boosts input voltage VIN to generate and export the first supply voltage VDD, and decompression conversion is single
Input voltage VIN 420 is reduced and exports second source voltage VCC by member, for providing operating voltage for device chip and being the
Two charge pump units 440 provide low-voltage, and the first charge pump unit 430 is positive charge pump, and the VIN voltage of input is passed through crystal
The charge and discharge of the switch and capacitance of pipe is electrically operated to boost and exports gate high-voltage VGH, and the second charge pump unit 440 is negative electrical charge
Pump, second source voltage VCC are depressured by negative charge pump circuit and export grid low-voltage VGL.First supply voltage VDD and
Two supply voltage VCC are as the high level and low level voltage for being input to Gamma reference voltage units 340.The grid is high
The grid that voltage VGH is applied to switching transistor by gate line realizes conducting, and grid low-voltage VGL is mainly realized and opened
Close the shutdown of transistor.
The boost conversion unit 410, the boosting for being depressured converting unit 420 and decompression are the charging and discharging using inductance
Afterflow is realized, and the size that adjusts by pulse width modulation (PWM) and control output voltage.
In one embodiment of the invention, when VIN is 12V, VCC 3.3V.
As shown in figure 4, second charge pump unit 440 includes control unit 441, switch unit 442, capacitance C, first
Diode D1 and the second diode D2；441 output switching signal of control unit controls its handover operation to switch unit 442,
442 one end of switch unit is connect with input voltage VIN, other end ground connection；The first electrode of first diode D1 and the second charge
The output terminal connection of pump unit 440, the second electrode of the second diode D2 are connect with being depressured the output terminal of converting unit 420, the
The second electrode of one diode D1 is connected in contact point N2 with the first electrode of the second diode；The first electrode of capacitance C is with opening
The output terminal for closing unit 442 is connected, and the second electrode of capacitance C is connected with contact point N2.
Switch unit 442 include the first transistor T1 and second transistor T2, wherein, the drain electrode of the first transistor T1 with it is defeated
Enter voltage VIN connections, the source electrode ground connection of second transistor T2, the grid of the first transistor T1 and the grid of second transistor T2 are equal
It is connect with the output terminal of control unit 441, the source electrode of the first transistor T1 is connected in contact point with the drain electrode of second transistor T2
The first electrode of N1, contact point N1 connection capacitance C.
Control unit 441 exports first switch signal S1 and second switch signal S2, and switching signal S1 and S2 distinguish
The grid of the first transistor T1 and second transistor T2 are input into, controls the switch of the first transistor T1 and second transistor T2
Operation.When the first transistor T1 is connected, the endless full cut-ofves of second transistor T2, the i.e. channel of second transistor T2 are in part
The state of opening.At this point, the raceway groove of second transistor T2 has a degree of channel resistance Rds.The control of control unit 441 the
Two-transistor T2 so that second transistor T2 has scheduled channel resistance Rds when the first transistor T1 is connected.It is in addition, logical
Adjustment second switch signal S2 is crossed, the value of aisle resistance Rds can be adjusted, and then the charging voltage of capacitance C can be adjusted.When
When one transistor T1 ends, second transistor T2 is fully on.The first electrode of first diode D1 is connected to the second charge pump
The output terminal of unit 440, the second electrode of the first diode D1 are connected to the second electrode of capacitance C.The first electricity of the capacitance C
Pole is connected to the contact point N1 of transistor.The first electrode of second diode D2 is connected to the second electrode of capacitance C.Second source
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 decompression conversion
The output terminal of unit 420, to receive second source voltage VCC.The forward direction of the second diode D2 is first electrode to second
The direction of electrode.Capacitance C as described above will be electrically charged, and generate grid low-voltage VGL by charging voltage.Detailed process
For：Control unit 441 opens the first transistor T1, and the channel portion of control second transistor T2 is opened, at this point, the of capacitance C
The voltage of one electrode is the voltage of first make contact N1, and as input voltage VIN subtracts T2 channel voltage Vds, the second electricity of capacitance C
The voltage of pole is VCC.Therefore, when being disconnected when the channel portion of the first transistor T1 conductings and second transistor T2, capacitance C
Voltage be charged to (VIN-Vds-VCC).Then, control unit 441 closes the first transistor T1 and connects second transistor
T2.At this point, the first electrode of capacitance C is grounded via second transistor T2.Due to the electricity between the first and second electrodes of capacitance C
Pressure difference is maintained by the voltage (VIN-Vds-VCC) precharged, so the voltage of the second electrode of capacitance C is-(VIN-Vds-
VCC)=(- VIN+Vds+VCC).Therefore, the voltage of the output terminal of the second charge pump unit 440, that is, grid low-voltage VGL has
The output valve of VGL=Vd+ (- VIN+Vds+VCC).The Vd is the forward voltage drop that the first diode generates.Therefore, Ke Yitong
Vds is overregulated to adjust the voltage to charge in capacitor C, so as to adjust the output valve of grid low-voltage VGL.As described above,
Input voltage VIN is converted into grid low-voltage VGL by the second charge pump unit 440, during grid low-voltage VGL is generated,
The channel voltage Vds of second transistor T2 can be reduced by using second source voltage VCC.If the of the second diode D2
Two electrodes are grounded, then VGL=Vd+ (- VIN+Vds'), and Vds' is the channel voltage of the second transistor under such state.If Vd
For certain value, then Vds'=Vds+VCC, VCC are about 3.3V.Therefore, when second source voltage VCC is applied to the second diode
During the second electrode of D2, compared with the situation of second electrode ground connection, system can reduce the power attenuation of 3.3V.Moreover, with
The reduction of power attenuation can reduce the fever of power circuit block 400.Therefore, when input voltage VIN is about 12V, grid is low
Voltage be about -5V to -7V liquid crystal display tested as a result, using second source voltage VCC in the case of, power supply
The temperature of circuit module 400 reduces about 3 DEG C -4 DEG C.To sum up, in the solution of the present invention, by generating grid low-voltage mistake
The supply voltage VCC with the voltage value higher than ground voltage is used in journey, reduces the voltage to charge in the capacitor.Cause
This, can reduce the channel voltage of second transistor, so as to reduce the power loss caused by the generation of channel voltage
And fever.
The LCD panel display unit 200 includes gate line, data signal line and matrix of pixel cells, wherein,
Gate line and data signal line are mutually orthogonal, and matrix of pixel cells is all connected with gate line, data signal line.
As shown in Fig. 2, the pixel unit includes pixel electrode, public electrode, liquid crystal capacitance Clc, storage capacitance Cs and P
Channel field-effect pipe T, wherein, the grid of P-channel field-effect transistor (PEFT) pipe T is connect with gate line GL, the source of P-channel field-effect transistor (PEFT) pipe T
Pole is connect by pixel electrode with data signal line DL, drain electrode and liquid crystal capacitance Clc, the storage capacitance Cs of P-channel field-effect transistor (PEFT) pipe T
It is all connected with, the other end of liquid crystal capacitance Clc, the other end of storage capacitance Cs are connect with public electrode.Liquid crystal molecule is in grid
Under the control of signal, the electric field formed on liquid crystal capacitance is respectively applied to by pixel electrode and public electrode to control liquid crystal point
The rotation angle of son, realizes the display of single liquid crystal pixel.The storage capacitance mainly carries out line by line in gate drive signal
The normal display in one frame time of lastrow image is kept during scanning.
Drive circuit unit includes timing control unit 310, drive element of the grid 320,330 and of data drive unit
Gamma reference voltage units 340, drive element of the grid 320 connect with the first charge pump unit 430, the second charge pump unit 440
It connecing, data drive unit 330 is connect with boost conversion unit 410, wherein, timing control unit 310 is used to receive external equipment
Incoming video signal, export first control signal GCS after treatment to drive element of the grid, and export second control signal
DCS is to data drive unit 330；Gamma reference voltage units 340 for generating multiple reference voltage Vgamma, and export to
Data drive unit 330；Drive element of the grid 320 is used to receive first control signal GCS and exports gate high-voltage signal VGH
With grid low-voltage signal VGL to LCD panel display unit 200, turning on and off line by line is realized to switching transistor；Number
It is used to receive second control signal DCS according to driving unit 330 and provides data voltage to data signal line.For input
Gamma reference voltage Vgamma, are divided by bleeder circuit, and generation is corresponding to the grayscale voltage of image data Data.Work as image
When data Data is n, 2^n grayscale voltage is generated.The data drive unit 330 will be with image data corresponding grey scale electricity
Pressure is output on data signal line, under the control of grid signal, realizes the display of image.
Back light unit 500 includes cold-cathode fluorescence lamp (CCFL) or external electrode fluorescent lamp (EEFL) or light emitting diode
(LED)。
The above is only some embodiments of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the principle of the present invention, several improvement can also be made, these improvement should be regarded as the guarantor of the present invention
Protect range.
Claims (9)
1. a kind of liquid crystal display of low-power consumption, which is characterized in that including LCD panel display unit (200), driving circuit
Unit, back light unit (500) and power circuit block (400), drive circuit unit and back light unit (500) are and liquid crystal display panel
Display unit (200) connects, and power circuit block (400) is connect with drive circuit unit；
Wherein, power circuit block (400) includes boost conversion unit (410), decompression converting unit (420), the first charge pump
Unit (430) and the second charge pump unit (440), boost conversion unit (410), decompression converting unit (420), the first charge pump
Unit (430) and the second charge pump unit (440) are connect with input voltage VIN, and the output terminal of decompression converting unit (420) is also
It is connect with the input terminal of the second charge pump unit (440), boost conversion unit (410) exports the first supply voltage VDD, and decompression turns
Unit (420) output second source voltage VCC is changed, for providing operating voltage for device chip and being the second charge pump unit
(440) low-voltage, the first charge pump unit (430) output gate high-voltage VGH, the second charge pump unit (440) output are provided
Grid low-voltage VGL.
2. the liquid crystal display of low-power consumption according to claim 1, which is characterized in that second charge pump unit
(440) including control unit (441), switch unit (442), capacitance C, the first diode D1 and the second diode D2；Control is single
First (441) output switching signal gives switch unit (442), and switch unit (442) one end is connect with input voltage VIN, the other end
Ground connection；The first electrode of first diode D1 is connect with the output terminal of the second charge pump unit (440), and the of the second diode D2
Two electrodes connects with the output terminal of decompression converting unit (420), and the of the second electrode of the first diode D1 and the second diode
One electrode is connected in contact point N2；The first electrode of capacitance C is connected with the output terminal of switch unit (442), the second electricity of capacitance C
Pole is connected with contact point N2.
3. the liquid crystal display of low-power consumption according to claim 2, which is characterized in that switch unit (442) includes
One transistor T1 and second transistor T2, wherein, the drain electrode of the first transistor T1 is connect with input voltage VIN, second transistor
The source electrode ground connection of T2, the output terminal of the grid of the first transistor T1 and the grid of second transistor T2 with control unit (441)
Connection, the source electrode of the first transistor T1 are connected in contact point N1 with the drain electrode of second transistor T2, contact point N1 connection capacitances C's
First electrode.
4. the liquid crystal display of low-power consumption according to claim 1, which is characterized in that the boost conversion unit
(410), the size that decompression converting unit (420) is adjusted using pulse width modulation (PWM) and controlled output voltage.
5. the liquid crystal display of low-power consumption according to claim 1, which is characterized in that first charge pump is simple eye
(430) it is positive charge pump, the second charge pump unit (440) is negative charge pump.
6. the liquid crystal display of low-power consumption according to claim 1, which is characterized in that the LCD panel display unit
(200) including gate line, data signal line and matrix of pixel cells, wherein, gate line and data signal line are mutual
Orthogonal, matrix of pixel cells is all connected with gate line, data signal line.
7. the liquid crystal display of low-power consumption according to claim 6, which is characterized in that the pixel unit includes pixel
Electrode, public electrode, liquid crystal capacitance Clc, storage capacitance Cs and P-channel field-effect transistor (PEFT) pipe T, wherein, the grid of P-channel field-effect transistor (PEFT) pipe T
Pole is connect with gate line GL, and the source electrode of P-channel field-effect transistor (PEFT) pipe T is connect by pixel electrode with data signal line DL, P-channel
The drain electrode of field-effect tube T is all connected with liquid crystal capacitance Clc, storage capacitance Cs, the other end, the storage capacitance Cs of liquid crystal capacitance Clc
The other end connect with public electrode.
8. the liquid crystal display of low-power consumption according to claim 1, which is characterized in that drive circuit unit includes sequential
Control unit (310), drive element of the grid (320), data drive unit (330) and Gamma reference voltage units (340), grid
Pole driving unit (320) is connect with the first charge pump unit (430), the second charge pump unit (440), data drive unit
(330) it is connect with boost conversion unit (410), wherein, timing control unit (310) is for receiving the input video of external equipment
Signal exports first control signal GCS to drive element of the grid after treatment, and exports second control signal DCS to data
Driving unit (330)；Gamma reference voltage units (340) are exported and are driven to data for generating multiple reference voltage Vgamma
Moving cell (330)；Drive element of the grid (320) for receive first control signal GCS and export gate high-voltage signal VGH and
Grid low-voltage signal VGL gives LCD panel display unit (200)；Data drive unit (330) is believed for receiving the second control
Number DCS simultaneously provides data voltage to data signal line.
9. the liquid crystal display of low-power consumption according to claim 1, which is characterized in that back light unit (500) is including cold
Cathode fluorescent lamp (CCFL) or external electrode fluorescent lamp (EEFL) or light emitting diode (LED).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810035097.8A CN108231027B (en) | 2018-01-15 | 2018-01-15 | Low-power-consumption liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810035097.8A CN108231027B (en) | 2018-01-15 | 2018-01-15 | Low-power-consumption liquid crystal display device |
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| CN108231027B CN108231027B (en) | 2020-05-12 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109637486A (en) * | 2019-01-25 | 2019-04-16 | 昆山龙腾光电有限公司 | Display driver circuit and its display driving method |
| 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 |
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