CN104269148B - liquid crystal driving circuit, liquid crystal driving method and liquid crystal display device - Google Patents
liquid crystal driving circuit, liquid crystal driving method and liquid crystal display device Download PDFInfo
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- CN104269148B CN104269148B CN201410522438.6A CN201410522438A CN104269148B CN 104269148 B CN104269148 B CN 104269148B CN 201410522438 A CN201410522438 A CN 201410522438A CN 104269148 B CN104269148 B CN 104269148B
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Abstract
The invention discloses a liquid crystal driving circuit for a display panel, a liquid crystal driving method for the display panel and a liquid crystal display device. The liquid crystal driving circuit comprises a voltage compensation module, wherein the voltage compensation module is used for compensating for the on-state voltage, attenuating abnormally, of a grid electrode during a shutdown, so that the value of the on-state voltage of the grid electrode is increased. According to the liquid crystal driving circuit and the liquid crystal driving method, the on-state current of a thin film transistor can be increased through the output voltage of the grid electrode, in this way, the release rate of residual charge can be increased at the moment of the shutdown, and horizontal bright lines are prevented from being generated during the shutdown.
Description
Technical field
The present invention relates to the liquid crystal display drive circuit of display technology field, more particularly, to display floater, LCD drive method and
Liquid crystal indicator.
Background technology
At present, flat-panel display device is ubiquitous in the life of people.Wherein, Thin Film Transistor-LCD
(tft-lcd), because of its small volume, the features such as low in energy consumption and radiationless, in current flat panel display market, occupy leading position.Liquid
Crystal display includes: liquid crystal panel assembly 100, data driver 200 and the gate drivers being connected to liquid crystal panel assembly 100
300th, it is connected to the gray voltage generator (gamma voltage generator) 400 of data driver 200, be used for controlling
The time schedule controller (timing controller) 500 of gate drivers 300 data driver 200 and responsible liquid crystal
Show the dc/dc DC-DC power supply change-over circuit 700 of the running voltage needed for device, this dc/dc DC-DC power supply is changed
Circuit 700 makes liquid crystal display be able to normal work.
The driving framework of tft-lcd as shown in figure 1, main by source drive ic (source driver) 10, raster data model
Ic (gate driver) 20, power circuit (dc/dc conveter) 30 and time schedule controller (timing controller,
Abbreviation t-con) 40, gray voltage generator (gamma) 50, export lvsd data signal to time schedule controller (timing
Controller, abbreviation t-con) 40 interface connector (interface connector) 60 composition.Source drive ic receives
From the signal of time schedule controller t-con 40 and gray voltage generator (gamma) 50, time schedule controller (timing simultaneously
Controller, abbreviation t-con) 40 transmission the signals such as minin lvds, clk, tp, pol to source drive ic, will be received
The internal circuit through source drive ic for the image data be converted to pixel voltage and export to tft-lcd panel 100.Raster data model
Ic20 accepts power circuit (dc/dc conveter) 30 opening signals vgh and shutdown signal vgl is carried out control gate and beat to open or close
Close the gate line in tft-lcd panel, the control signal that raster data model ic20 reception simultaneously is sent from time schedule controller t-con
Oe, stv, cpv, xon, control signal produces in reasonable time point and is turned on and off the thin of each pixel in tft-lcd panel
The required voltage of film transistor (tft) switch.When power circuit (dc/dc conveter) 30 output HIGH voltage vgh drives to grid
During dynamic ic20, the tft switch of tft-lcd panel itself is opened, the pixel voltage of now source drive ic output is opened by tft
Close and enter pixel electrode, realize the discharge and recharge to pixel.When power circuit (dc/dc conveter) 30 output HIGH voltage vgl gives
During raster data model ic20, by the tft switch OFF of tft-lcd panel itself, pixel completes discharge and recharge, and pixel voltage passes through pixel
Interior storage capacitance cs and liquid crystal capacitance clc are held in pixel.
Typically, when tft-lcd panel 100 is in shutdown, picture is held in liquid crystal capacitance clc by storage capacitance cs
Pixel voltage in element can not discharge, so ghost phenomena occurs on tft-lcd panel 100 at once.In order to eliminate tft-
The ghost phenomena that lcd panel 100 occurs in shutdown.Traditional countermeasure is to shut down moment in tft-lcd panel 100, sequential
Controller t-con can send an xon signal to raster data model ic, and the voltage of all scan lines in display floater is all drawn
To on-state voltage vgh, so that the tft of all pixels is switched and open, discharge rapidly the electric charge on cs electric capacity and clc electric capacity.
For some tft-lcd panels, in the moment of shutdown, the bright line b mono- of one or more level is occurred on screen
Dodge and mistake, and the width of bright line is substantially identical to the width of scan line (gate line).As shown in Fig. 2 leading to this abnormal phenomena
The reason one of to be raster data model ic20 output pin trickle dislocation in crimping corresponding with tft-lcd panel 100, make
Current channel in scan line narrows, or the scan line that leads to bright line region b occurs due to certain reason on processing procedure
Other scanning line impedences of impedance ratio big (as Fig. 2 shown in dashed region a).Although, the impedance r of increase is not very big, no
Image quality when normally showing can be caused.But, according to the formula of the electric current i flowing through on resistance r and voltage u: u=i*r, occur bright
The voltage and current passing through in the scan line in line region, than the scan line of other normal regions have a certain degree of decay so that
The grid voltage delivering to tft is not enough to allow tft switch fully to open, and leads to tft channel conduction less able.Originally fill with
The cs electric capacity of electric charge and clc electric capacity outwards discharge electric charge by data wire, because what electric charge discharged within the limited time does not fill
Point, make electric discharge and produce the time delay of a period of time, thus picture has obvious bright line in shutdown, lead to show bad.
Content of the invention
In view of this, for a kind of problem of the prior art or other deficiencies, the invention provides a kind of liquid crystal drive
Circuit, LCD drive method and liquid crystal indicator, achievable display device shutdown when, in the liquid crystal storage capacitance in panel
Storage electric charge can fully be discharged, thus avoid shutdown when picture occur display bad, lifted display quality.
One aspect of the present invention provides a kind of liquid crystal display drive circuit, comprising: voltage compensation module, for shutdown when to different
Often the grid on-state voltage of decay compensates, and described grid on-state voltage value increases；
Described voltage compensation module specifically includes: voltage comparator module, judges to close for the size according to input voltage
Whether machine is activated；Low-pressure linear voltage stabilizing circuit module, for being converted into described grid on-state voltage by described input voltage
Booater voltage exports；Switch element, for described be judged as shutdown when, described switch element controls described voltage compensation module defeated
Go out described grid on-state voltage value and described booater voltage value sum；
Low-pressure linear voltage stabilizing circuit module, including an adjustable linear voltage regulator, described input voltage port connects the second electricity
The positive pole holding, is concurrently accessed the input of described manostat, the minus earth of the second electric capacity, the output port of described manostat connects
One end of pull-up resistor, the feedback port of the described manostat of another termination, the feedback of a described manostat of termination of pull down resistor
Port, the other end is grounded.Further, described voltage comparator module, including a voltage comparator, first resistor, its one end
Connect described input voltage port, the positive input of the described comparator of another termination, second resistance, one terminates described comparator
Positive input, the other end be grounded.
Further, switch element, including a p mos pipe and nmos pipe, pmo manages, and its source electrode connects described low-pressure linear
The output port of voltage stabilizing circuit module, drain electrode connects the negative pole of the first electric capacity, and grid one tunnel connects the output port of described comparator, separately
One tunnel connects described nmos tube grid.Nmos manages, and grid connects the outfan of voltage comparator module u1, and drain electrode connects the first electric capacity c1's
Negative pole, source ground.
Further, also include a diode, positive pole connects the normal on-state voltage of power circuit generation, negative pole connects the first electricity
The positive pole holding, 3rd resistor, the negative terminal of a described diode of termination, the negative pole of described first electric capacity of another termination.
Another aspect of the present invention provides a kind of LCD drive method, comprising: using in described liquid crystal display drive circuit
Voltage compensation module, for compensating to the grid on-state voltage of decay pattern of anomaly in shutdown, described grid on-state voltage value
Increase.
Further, it is used for judging whether shutdown is activated according to the size of input voltage using voltage comparator module；
The booater voltage being used for being converted into described input voltage described grid on-state voltage using low-pressure linear voltage stabilizing circuit module is defeated
Go out；Using switch element be used for described be judged as shutdown when, described switch element controls described voltage compensation module output described
Grid on-state voltage value and described booater voltage value sum.
Further, described liquid crystal display drive circuit also includes power circuit, gate drivers, in shutdown, described power supply
The grid on-state voltage that circuit produces inputs described voltage compensation module, the described control source of described voltage compensation module output
Described gate drivers.
On the one hand the present invention has and provides a kind of liquid crystal indicator, comprising: display panels and be used for connecting institute
The circuit board of display panels, the liquid crystal display drive circuit as described in preceding claim embodiment is arranged in described circuit board
On.
Brief description
Fig. 1 is the block schematic illustration of liquid crystal indicator in prior art；
Fig. 2 is the frame principle that in Fig. 1, bright line in liquid crystal indicator shutdown moment；
Relation between grid voltage vgs that Fig. 3 switchs for tft and electric current ids；
Fig. 4 is the block schematic illustration of liquid crystal indicator of the present invention；
Fig. 5 is the principle schematic of liquid crystal display drive circuit of the present invention；
Fig. 6 is the circuit timing diagram of liquid crystal display drive circuit in Fig. 5 of the present invention；
Fig. 7 is liquid crystal display systems configuration diagram of the present invention.
Specific embodiment
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
In order to solve the problems, such as that tft-lcd bright line in shutdown moment, the present invention provides a kind of circuit, using grid electricity
It is pressed in extendible scope, in shutdown, the grid on-state voltage vgh of decay is compensated, increase grid on-state voltage
Actual value.
The i-v characteristic between grid voltage vgs and channel current ids according to tft switch as shown in Figure 3, grid
Pole tension can affect the conductivity degree of tft switch, and high current when tft conducting carries the function of discharge and recharge.Grid electricity
Pressure is higher, and ON state current is bigger, and the speed of discharge and recharge is faster, and discharge and recharge is more abundant.Typically, tft-lcd panel is in normal work
When grid voltage and the maximum gate voltage that can bear of raster data model ic between probably have the gap of 5-7v.So, closing
Machine moment, on the basis of normal grid on-state voltage vgh, grid on-state voltage can be improved several volts again.
Horizontal brightness b countermeasure principle in existing Fig. 2 that the present invention provides is as shown in Figure 4.In the diagram, functional circuit mould
Block circuit1 70 can produce a voltage superposition to the circuit being originally used for transmitting grid on-state voltage vgh in shutdown,
So that the tft on-state voltage vgh originally having decayed is raised, and be input to raster data model ic 20.Now, in tft-lcd face
Plate 100 shuts down moment, once xon signal is called, by internal level shifter (level shift, abbreviation l/s) 80
Effect is so as to get the vgh compensating is loaded in the every scan line 21 in tft-lcd panel 100.So, the grid of tft switch
Pole tension is bigger than the voltage originally opened so that the channel current of tft switch 101 is bigger, and the ability that raceway groove discharges electric charge increases
By force.So, the residual charge being stored in pixel in cs electric capacity and clc electric capacity is discharged rapidly by data wire, thus reaching
Purpose to horizontal brightness when eliminating shutdown.
Circuit module circuit1 70 as shown in Figure 4, a concrete implementation structure is as shown in Figure 5.In Figure 5, two
The positive pole of pole pipe d1 meets the normal on-state voltage vgh of the tft switch of power circuit generation, and negative pole connects the positive pole of storage capacitor c1.
The negative terminal of the one termination d1 of resistance rl, the negative pole of another termination c1, one rc network of composition in parallel with c1.U2 can for an output
Mode low-pressure linear mu balanced circuit ldo.The input port vin of circuit module circuit1 connects the positive pole of input capacitance c2, simultaneously
Meet the input vin of ldo.The minus earth of c2.The output port vout of u2 connects one end of pull-up resistor ra, another termination u2
The feedback port adj of the one termination u2 of feedback port adj, rb, the other end is grounded.The source electrode of pmos transistor q1 connects the output of u2
Port vout, drain electrode connects the negative pole of c1, and grid connects between the output port of voltage comparator u1 and the grid of nmos transistor.Adopt
The input vin of one termination power of sample resistance r1, the positive input of another termination u1.The one termination u1's of sampling resistor r2
Positive input, the other end is grounded.The grid of nmos q2 connects the outfan of u1, and drain electrode connects the negative pole of c1, source ground.
In Figure 5, u1 is voltage comparator, and u2 is an adjustable ldo of output.R1, r2 detect to power supply vin,
Partial pressure is sampled u1 forward end and is compared with reference voltage vref.Shutdown action is carried out with anticipation, sequential such as Fig. 6 institute of shutting down
Show.Assume that input voltage during shutdown is 12v, by the regulation to r1, r2, when vin is more than 90%*12v it is believed that not being to close
The action of machine is so that when entering the voltage of u1 forward end more than vref, u1 output is high, and now q1 closes, and q2 opens, the output of u2
Voltage vo will not be added to c1, and the voltage at c1 two ends is the vgh (ignoring the pressure drop of d1) being originally attenuated.When vin electricity
When pressure drops to less than 90%*12v, determine the action of shutdown, the voltage entering u1 forward end is less than vref, now u1 output
Low, q1 turns on, and q2 opens, and the output voltage vo of u2 is added on the bottom crown of electric capacity c1 by q1, the bottom crown voltage of c1 by
0v is lifted to vo, the characteristic can not being mutated according to electric capacity both end voltage, and top crown moment is lifted to vgh+vo, and now c1 leads to
Cross rl to be charged, the time that vgh+vo keeps is the time that c1 charges, determined by the time constant т=r*c of rc circuit.
The circuit module that the present invention provides, by compensating to grid voltage in shutdown, can effectively solve by grid
The conductive channel between panel for the ic is driven to cause the abnormal problem of shutdown because of impedance variation.Described circuit module using flexibly and
With low cost.As shown in fig. 7, described circuit module is as an independent circuit module, power circuit (dc/dc
Conveter) 30, time schedule controller (timing controller, abbreviation t-con) 40, gray voltage generator (gamma)
50th, circuit module circuit1 70, all in this independent circuits module, can be connected to mould according to the practical situation of panel 100
On the circuit board s-pwb of data wire side of group, only need to reserve connection four ports of circuit module (2 defeated when designing s-pwb
Enter, 1 output, 1 publicly).There is the situation of bright line when the panel using occurs shutdown, only need to be by this circuit module
It is welded on the pad position that s-pwb reserves.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned embodiment
Detail, in the range of the technology design of the present invention, multiple equivalents can be carried out to technical scheme, this
A little equivalents belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to various can
The compound mode of energy no longer separately illustrates.
Claims (8)
1. a kind of liquid crystal display drive circuit, comprising: voltage compensation module, for the grid on-state voltage to decay pattern of anomaly in shutdown
Compensate, described grid on-state voltage value increases；
Described voltage compensation module specifically includes:
According to the size of input voltage, voltage comparator module, for judging whether shutdown is activated；
Low-pressure linear voltage stabilizing circuit module, the booater voltage for described input voltage is converted into described grid on-state voltage is defeated
Go out, including an adjustable linear voltage regulator, described input voltage port connects the positive pole of the second electric capacity, is concurrently accessed described manostat
Input, the minus earth of the second electric capacity, the output port of described manostat connects one end of pull-up resistor, described in another termination
The feedback port of manostat, the feedback port of a described manostat of termination of pull down resistor, the other end is grounded；
Switch element, for described be judged as shutdown when, described switch element controls described voltage compensation module to export described grid
Pole on-state voltage value and described booater voltage value sum.
2. according to claim 1 liquid crystal display drive circuit it is characterised in that:
Described voltage comparator module, including a voltage comparator, first resistor, one terminates described input voltage port, separately
The positive input of the one described comparator of termination, second resistance, one terminates the positive input of described comparator, another termination
Ground.
3. according to claim 1 liquid crystal display drive circuit it is characterised in that:
Switch element, including a p mos pipe and nmos pipe, p mos manages, and its source electrode connects described low-pressure linear voltage stabilizing circuit module
Output port, drain electrode connects the negative pole of the first electric capacity, and grid one tunnel connects the output port of described comparator, and another road connects described
Nmos tube grid；Nmos manages, and grid connects the outfan of voltage comparator module u1, and drain electrode connects the negative pole of the first electric capacity c1, source electrode
Ground connection.
4. according to liquid crystal display drive circuit described in any one of claim 3 it is characterised in that: also include a diode, positive pole connects power supply
The normal on-state voltage that circuit produces, negative pole connects the positive pole of the first electric capacity, 3rd resistor, and one terminates the negative terminal of described diode,
Another negative pole terminating described first electric capacity.
5. a kind of LCD drive method, comprising:
Using the voltage compensation module in the liquid crystal display drive circuit as described in one of claim 1-4, in shutdown to different
Often the grid on-state voltage of decay compensates, and described grid on-state voltage value increases.
6. according to claim 5 LCD drive method it is characterised in that:
It is used for judging whether shutdown is activated according to the size of input voltage using voltage comparator module；
It is used for being converted into described input voltage the amplification electricity of described grid on-state voltage using low-pressure linear voltage stabilizing circuit module
Pressure output；
Using switch element be used for described be judged as shutdown when, described switch element controls described voltage compensation module output described
Grid on-state voltage value and described booater voltage value sum.
7. according to claim 5 or 6 LCD drive method it is characterised in that: described liquid crystal display drive circuit also includes power supply
Circuit, gate drivers, in shutdown, the grid on-state voltage that described power circuit produces inputs described voltage compensation module,
The gate drivers described in described control source of described voltage compensation module output.
8. a kind of liquid crystal indicator, comprising:
Display panels and the circuit board for connecting institute's display panels, as described in any one of claim 1-4
Liquid crystal display drive circuit is arranged on described circuit board.
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| CN201410522438.6A CN104269148B (en) | 2014-09-30 | 2014-09-30 | liquid crystal driving circuit, liquid crystal driving method and liquid crystal display device |
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| CN201410522438.6A CN104269148B (en) | 2014-09-30 | 2014-09-30 | liquid crystal driving circuit, liquid crystal driving method and liquid crystal display device |
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| CN104269148B true CN104269148B (en) | 2017-02-01 |
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Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPWO2017033844A1 (en) * | 2015-08-27 | 2018-06-28 | シャープ株式会社 | Display device and power supply control method thereof |
| CN105469768A (en) | 2016-01-15 | 2016-04-06 | 京东方科技集团股份有限公司 | Display module controller, control method display device |
| CN105469742B (en) * | 2016-01-15 | 2018-11-13 | 京东方科技集团股份有限公司 | A kind of organic light emitting display and display device |
| CN106531116A (en) * | 2017-01-05 | 2017-03-22 | 京东方科技集团股份有限公司 | Starting method of shut-down residual shadow elimination and starting circuit thereof, power supply IC and display apparatus |
| CN107516499A (en) * | 2017-09-28 | 2017-12-26 | 重庆秉为科技有限公司 | Based on liquid crystal display drive circuit |
| CN107731186B (en) | 2017-10-31 | 2020-07-31 | 京东方科技集团股份有限公司 | Control circuit, control method and display device |
| CN107665066B (en) * | 2017-11-10 | 2020-07-24 | 厦门天马微电子有限公司 | Display panel and device |
| CN108962165B (en) * | 2018-07-18 | 2021-08-31 | 南京熊猫电子制造有限公司 | Circuit and method for eliminating power-down residual image of IGZO display panel |
| CN109493819A (en) * | 2018-12-17 | 2019-03-19 | 深圳市华星光电技术有限公司 | A kind of ghost eliminating method of gate driving circuit and display panel |
| CN110311556B (en) * | 2019-06-27 | 2020-08-04 | 南京中电熊猫液晶显示科技有限公司 | Power module, power control circuit and method for improving insufficient discharge of display panel |
| CN112700743B (en) | 2019-10-22 | 2022-09-09 | 合肥鑫晟光电科技有限公司 | Voltage control circuit, control method thereof and display device |
| US11257445B2 (en) * | 2019-11-18 | 2022-02-22 | E Ink Corporation | Methods for driving electro-optic displays |
| CN113205783B (en) * | 2021-04-25 | 2022-11-25 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20070039738A (en) * | 2005-10-10 | 2007-04-13 | 삼성전자주식회사 | Power apparatus of liquid crystal display and method of driving the same |
| KR101330216B1 (en) * | 2006-11-02 | 2013-11-18 | 삼성디스플레이 주식회사 | Liquid crystal display |
| CN101673519A (en) * | 2008-09-11 | 2010-03-17 | 联咏科技股份有限公司 | Electronic device for improving picture quality and relevant method and liquid crystal display thereof |
| CN101739967B (en) * | 2008-11-12 | 2012-11-07 | 瀚宇彩晶股份有限公司 | Method for eliminating shut-down afterimage of display, control panel and display thereof |
| CN101777320B (en) * | 2010-01-27 | 2012-02-01 | 友达光电（苏州）有限公司 | ghost eliminating circuit, display and electronic device |
| KR101745418B1 (en) * | 2010-12-30 | 2017-06-12 | 엘지디스플레이 주식회사 | Power supply unit and liquid crystal display device including the same |
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