CN1226713C - Circuit and method for quick eliminating off afterimage of liquid crystel display - Google Patents
Circuit and method for quick eliminating off afterimage of liquid crystel display Download PDFInfo
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- CN1226713C CN1226713C CN 01135079 CN01135079A CN1226713C CN 1226713 C CN1226713 C CN 1226713C CN 01135079 CN01135079 CN 01135079 CN 01135079 A CN01135079 A CN 01135079A CN 1226713 C CN1226713 C CN 1226713C
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- circuit
- reference voltage
- lcd
- voltage
- control signal
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Abstract
The present invention relates to a circuit and a method for rapidly eliminating turn-off afterimages of a liquid crystal display. The method comprises: receiving control signals are automatic control signals, and first reference voltage is compared with second reference voltage according to externally input activating signals; when the first reference voltage is less than or equal to the second reference voltage, starting signals are output to an LCD (liquid crystal display) power-supply controller and a rapid discharge circuit; if control signals are manually operated, starting signals are output to start up the LCD power-supply controller and the rapid discharge circuit; starting signals use the LCD power supply controller to cut off a power supply of the discharge circuit to match with the circuit for using a discharge path to generate an optimal discharge path. The circuit comprises a manual selector which outputs manual control signals, an automatic detection circuit which outputs automatic control signals for automatically detecting the power supplying state of the power supply, a select switch which outputs starting signals to eliminate afterimages according to the control signals, the rapid discharge circuit which rapidly eliminates LCD afterimages according to the starting signals and the LCD power supply controller which turns off the power supply of the discharge circuit according to the starting signals.
Description
Technical field
The present invention relates to a kind of treatment circuit and method (fast liquidcrystal display (LCD) power-off residual image suppressioncircuitry and a method thereto) of display shutdown after image, particularly relate to the circuit and the method for a kind of quick elimination LCD (LCD) shutdown after image, it is specially adapted to mobile phone (cellularphone).
Background technology
In LCD panel control circuit, (Super Twist Nematic, STN) liquid crystal panel are (for example: V to produce driving voltage by a voltage generation circuit to for example super twist mode
1, V
2, V
3, V
4And V
5), and utilize supply voltage (V
DD), V
1, V
2, V
3, V
4And V
5Change in voltage in different time makes liquid crystal produce the different variation of light and shade and shows different information.Fig. 1 is a typical LCD voltage generation circuit and stable state capacitor C s synoptic diagram thereof.In Fig. 1, in order to keep voltage (V
1, V
2, V
3, V
4And V
5) stable output, therefore to the driving voltage (V of each picture element
1, V
2, V
3, V
4And V
5) add a stable state capacitor C s1-Cs5.Yet circuit structure as shown in Figure 1 is as moment powered-down (V
DD) time, these stable state capacitor C s is carried on as before remaining electric charge and the electric power of a period of time can be provided, and causes liquid crystal panel to stay after image and does the demonstration that makes mistake.During to certain low-voltage, panel just can recover normally this phenomenon, thereby influences the visual effect of LCD until the remaining charge loss of electric capacity.Because the LCD circuit all is the design of low power consumption now, so persistence of vision is even more serious.In the design of LCD circuit for generating source voltage, two kinds of designs are arranged, the lcd drive voltage of the voltage V1-V5 in first kind of design can change along with the power vd D of digital controlled signal.This class design is when shutdown, and it closes motor speed and can be directly proportional with the VDD decline rate, and its sequential chart as shown in Figure 2.At t
HPeriod, charge discharge descends vdd voltage along with the LCD shutdown, voltage and voltage V1-V5 also can be along with being changed to 0V on each ranks terminal SEG and COM on the LCD panel, and the digital controlled signal DIG on each ranks terminal SEG and the COM also can follow the voltage of decline and produce distortion.So, use this class LCD, for example, the LCD drive integrated circult (IC) of Solomon, may there be the after image problem to produce because of the control signal distortion, and because of driving voltage can change with VDD, so also must add a voltage regulator (extra voltage regulator) the affected problem that solves voltage V1-V5 because power vd D changes.
The design of second kind of LCD circuit for generating source voltage, the voltage of its V1-V5 is at vdd voltage during greater than a certain normal working voltage, can to keep a fixed voltage poor with this vdd voltage, can not change with the change of VDD, for example in the LCD of EPSON drive IC, just add voltage modulator circuit and keep the signal in when shutdown, as shown in Figure 3.In Fig. 3, a voltage modulator circuit (voltage regulator circuit) is added into.But this adjuster circuit comprises an amplifier OP, and can adjust stable reference voltage device REF and a modulation (adjustable) multiplier (-icator).This amplifier OP can adjust reference potential that reference voltage device REF imported by this and the gain factor (gain factor) imported by resistor R 1 and adjustable variable-gain device that R2 constituted comes control output voltage V5 with one fixed difference distance between sustaining voltage V5 and voltage Vdd.The LCD circuit for generating source voltage of this type can be kept V1 to V5 voltage as possible via voltage regulator when shutdown, at this moment, if do not add any control signal, can make the after image problem even more serious.Therefore, generally this type of circuit must add a control signal RESETB when shutdown, makes this circuit that one section lead time t be arranged
HCan be earlier with the input of voltage V1 to V5 discharge and headroom signal wire SEG and COM.At this moment, because of vdd voltage really descends (real as yet carry out shutdown action) as yet, vdd voltage also exists, so that all digital controlled signal DIG still can keep is normal.Then, at powered-down VDD, this section shut-in time is t
RBehind power-off, just can not make distorted signals.But the reaction time of this mode (is t slowly
R+ t
H).
In view of the above, in Fig. 5, provide another circuit, also can improve the shutdown persistence of vision fast and reaction time that must be not extra.As shown in Figure 5, this circuit detects activation signal by a testing circuit 51.When this circuit be activated (PD=Low) and the electric capacity of voltage regulation of voltage V1 to V5 in electric charge when charging (Start_up=Low) fully, this testing circuit can be activated.After the activation, utilize a comparer 52 to make comparisons from a reference voltage source 53 and with respect to reference voltage VREF and another reference voltage VSS of VDD with one, the shutdown action whether occurs to detect, wherein, this another reference voltage can be the reference voltage of a ground voltage or user input.When if shutdown action and reference voltage VREF occurring and being lower than reference voltage VSS, as shown in Figure 6, when VDD just descended, VDD can be kept steady in certain value by voltage modulator circuit to the difference of V1, V2, V3, V4, V5 respectively; When VDD is reduced to a certain low spot, can detects a shutdown action but not noise occurs.After detecting the shutdown action, click control circuit 54 by one among Fig. 5 and drive a discharge circuit 56 reaches the elimination after image with the residual charge that discharges LCD purpose.Yet, shortcoming such as this mode has continued power delayed discharge time and as V5 during greater than VSS still because of voltage V1 to V5, and its discharging efficiency is not good.
Summary of the invention
In order to overcome the deficiencies in the prior art, a purpose of the present invention provides a kind of circuit of quick elimination LCD shutdown after image, with quick elimination LCD persistence of vision.
Another object of the present invention provides a kind of method of quick elimination LCD shutdown after image, and it provides manually and two modes that detect are automatically eliminated the LCD persistence of vision fast.
In order to reach described purpose, the invention provides a kind of circuit and method of quick elimination LCD shutdown after image.The method that should eliminate LCD shutdown after image fast comprises the following steps: to receive a control signal, if this control signal is an automatic control signal, then, keep first reference voltage and one second reference voltage of definite value to make comparisons one and one supply voltage according to the activation signal of an outside input; When this first reference voltage≤this second reference voltage, export enabling signal to a LCD power-supply controller of electric and a quick discharging circuit with quick elimination LCD shutdown after image; And, then directly export this enabling signal and drive this LCD power-supply controller of electric and this quick discharging circuit with quick elimination LCD shutdown after image if this control signal is a manual control signal.Wherein, above-mentioned enabling signal is utilized this LCD power-supply controller of electric cut-out to be supplied to the power supply of this quick discharging circuit and is cooperated this quick discharging circuit to use two discharge paths to produce an optimal discharge path to increase discharge rate.
The present invention also provides the circuit of quick elimination LCD shutdown after image, and it provides the method that comprises manually and eliminate LCD shutdown after image automatically fast, comprising: a manual selector switch, in order to export the manual control signal of an extraneous input; One automatic testing circuit is in order to automatic detection power supply power supply state and export an automatic control signal; One selector switch is in order to according to eliminating after image and exporting and start (activate) signal wherein in previous manual and the automatic control signal; One quick discharging circuit has two discharge paths, in order to eliminate LCD display shutdown persistence of vision (residual image effect) fast according to this enabling signal; And a LCD power-supply controller of electric, in order to close the power supply that is supplied to this quick discharging circuit according to this enabling signal to increase discharge rate.
Advantage of the present invention is: enabling signal of the present invention is utilized this LCD power-supply controller of electric to cut off and is supplied to the power supply of this quick discharging circuit and cooperates this quick discharging circuit to use two discharge paths to produce an optimal discharge path to increase discharge rate, therefore can eliminate the LCD persistence of vision fast.
Description of drawings
The present invention is described in detail below in conjunction with drawings and Examples:
Fig. 1 is a traditional LC D supply voltage system diagram;
Fig. 2 is the shutdown sequential chart that the LCD supply voltage V1 to V5 of displayed map 1 descends with VDD;
Fig. 3 is another traditional LC D supply voltage system diagram;
Fig. 4 is the shutdown sequential chart that the LCD supply voltage V1 to V5 of displayed map 3 does not descend with VDD;
Fig. 5 is that another tradition shutdown after image improves circuit diagram;
Graph of a relation when Fig. 6 is displayed map 5 shutdown between each associated voltage;
Fig. 7 is a quick elimination shutdown after image circuit diagram of the present invention;
Fig. 8 is the sequential chart of Fig. 7; And
Fig. 9 is the process flow diagram of Fig. 7.
Symbol description among the figure:
51,71,75 or the door
52,72 comparers
53,73 reference voltage sources
54,74 click control circuit
56,76 quick discharging circuits
77 LCD power-supply controller of electric
Embodiment
With reference to figure 7, be a circuit diagram of the present invention, it improves according to Fig. 5 and gets.In Fig. 7, this circuit comprises: a manual selector switch ERPIN, an automatic testing circuit 70, one or door 75, one quick discharging circuit 76 and a LCD power-supply controller of electric 77.This manual selector can be one to be connected to an extraneous control signal ERPIN who removes, in order to export a manual control signal MDRV from this input.This automatic testing circuit 70 partly is same as 50 parts of Fig. 5, comprises by a testing circuit 71 and detects activation signal.This testing circuit 71 can by one or door (ORgate) forms, in order to not close as yet at this circuit (at this moment, Power_down=low) and stable (Start_up=low) two condition this automatic testing circuit 70 of activation down at this moment, of electric capacity of voltage regulation.After the activation, this circuit 70 utilizes a comparer 72 that reference voltage VREF and another reference voltage VSS from a reference voltage source 73 made comparisons, and the shutdown action whether occurs with automatic detection.Wherein, this another reference voltage VSS can be a ground voltage or a reference voltage that the user provided.When action and reference voltage VREF are lower than reference voltage VSS if occur shutting down, then click control circuit 74 outputs one automatic control signal ADRV by one.Should or door 75, can be manually or automatic control signal according to this, eliminate after image and export one and start (activate) signal SELDRV.This quick discharging circuit 76, in order to according to this enabling signal SELDRV, with (also can between VDD to V1, V2, V3, V4, switch being set simultaneously) between VDD and V5 two switch SW 1 and SW2 are set, the control signal SELDRV_V5 by ground voltage is controlled with V5 by the conversion of magnitude of voltage change-over circuit to make this two switch be subjected to this enabling signal SELDRV and respectively, causes capacitor C to go up residual charge energy and eliminates LCD display shutdown persistence of vision (residual image effect) fast via the minimum impedance path in this two switch.For example, as V5 during near VDD, can variation via the discharge path efficient in switch SW 2 paths, this moment, this switch SW 1 path was by the signal controlling of VDD to VSS, just can bring into play function in good time, increase discharging efficiency when VDD＞V5＞VSS.This two switch can be made of any driving component, for example, and the MOS assembly.Simultaneously, according to this enabling signal SELDRV, the power supply that utilizes this LCD power-supply controller of electric 77 to close to be supplied to this quick discharging circuit is to increase discharge rate.
Fig. 8 is the time sequential routine figure that detects automatically among Fig. 7 partly.As shown in Figure 8, when supply-voltage source VDD began to descend, voltage VDD still remained unchanged to the difference of voltage V1-V5 respectively, and makes signal keep normal demonstration.Through t after a while
KAfter, when reducing to this power-off, power vd D detects critical point Vth
1And when being detected by this circuit 70, controller 77 cuts out and is supplied to the power supply on the capacitor and begins discharging action.Capacitor can discharge via less one of resistance value on this two switch, up to a period of time t
HBack voltage is lower than the critical point Vth of LCD panel
2Till.For example, when beginning to discharge, VSS＞V5, capacitor C is most can be via switch SW 2 discharges, as V5 during near VSS, and can variation via the discharge path efficient in switch SW 2 paths, at this moment, this switch SW 1 path is by the signal controlling of VDD to VSS, just can bring into play function in good time, increases discharging efficiency when VDD＞V5＞VSS.
Fig. 9 is the process flow diagram of Fig. 7.As shown in Figure 9, this method of eliminating LCD shutdown after image fast comprises the following steps: to receive a control signal (S1); If this control signal is an automatic control signal, then according to the activation signal of an outside input with first reference voltage of one and one supply voltage maintenance definite value and one second reference voltage make comparisons (S2); When this first reference voltage≤this second reference voltage, export enabling signal to a LCD power-supply controller of electric and a quick discharging circuit with quick elimination LCD shutdown after image (S3); And, then directly export an enabling signal to drive this LCD power-supply controller of electric and this quick discharging circuit with quick elimination LCD shutdown after image (S4) if this control signal is a manual control signal.Wherein, this enabling signal is to utilize this LCD power-supply controller of electric to cut off to be supplied to the power supply of this quick discharging circuit and to cooperate this quick discharging circuit to use two discharge paths to increase discharge rate, and this second reference voltage can be the reference voltage that a ground voltage or user provide.
Though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; in without departing from the spirit or scope of the invention; change and retouching when doing, so protection scope of the present invention claims and be as the criterion in conjunction with instructions and the accompanying drawing person of defining.
Claims (15)
1. a method of eliminating LCD shutdown after image fast comprises the following steps:
Reception-control signal;
If this control signal is an automatic control signal, then according to the activation signal of an outside input, first reference voltage and one second reference voltage that one and one supply voltage are maintained fixed difference are made comparisons;
When this first reference voltage during smaller or equal to this second reference voltage, export enabling signal to a LCD power-supply controller of electric and a quick discharging circuit, this quick discharging circuit has two discharge paths so that electric charge is eliminated fast by minimum impedance path wherein;
If this control signal is a manual control signal, then directly exports this enabling signal and drive this LCD power-supply controller of electric and this quick discharging circuit; And
Be supplied to the power supply of this quick discharging circuit via this LCD power-supply controller of electric cut-out and cooperate this quick discharging circuit to use two discharge paths to produce an optimal discharge path according to this enabling signal to increase discharge rate.
2. method according to claim 1 is characterized in that: this manual control signal is from an input that is connected to the conduction wiring of an external key.
3. method according to claim 1 is characterized in that: this enabling signal is from a selector switch that is made of logic gate.
4. method according to claim 3 is characterized in that: this discharge path uses the switchgear of driving component as its path.
5. method according to claim 1 is characterized in that: this optimal discharge path is to decide with the potential difference (PD) at these two discharge paths two ends.
6. method according to claim 1 is characterized in that: this second reference voltage is a ground voltage.
7. method according to claim 1 is characterized in that: the reference voltage that this second reference voltage person of being to use provides.
8. circuit of eliminating fast LCD shutdown after image, it provides the method that comprises manually and eliminate LCD shutdown after image automatically fast, and this circuit comprises:
One manual selector switch is in order to export the manual control signal of an extraneous input;
One automatic testing circuit is in order to automatic detection power supply power supply state and import an automatic control signal;
One selector switch was in order to select a mode wherein to eliminate after image and export an enabling signal according to should manually reaching automatic control signal;
One quick discharging circuit has two discharge paths, in order to select according to this enabling signal one of them as the optimal discharge path with quick elimination LCD display shutdown persistence of vision; And
One LCD power-supply controller of electric is in order to close the power supply that is supplied to this quick discharging circuit to increase discharge rate according to this enabling signal.
9. circuit according to claim 8 is characterized in that: this manual selector is one to be connected to the conduction wiring of an external key.
10. circuit according to claim 8 is characterized in that: this automatic testing circuit further comprises:
One testing circuit, by one or door forms, in order to not close in entire circuit and electric capacity of voltage regulation has been exported an activation signal under the steady state (SS) and activated this automatic testing circuit;
Whether one comparer in order to make comparisons from first reference voltage and one second reference voltage of a reference voltage source one, the shutdown action occurs with automatic detection;
One clicks control circuit, in order to when this first reference voltage is lower than this second reference voltage, exports an automatic control signal to this selector switch.
11. circuit according to claim 8 is characterized in that: this selector switch be one or the door.
12. circuit according to claim 8 is characterized in that: decide with the potential difference (PD) at these two discharge paths two ends in this optimal discharge path.
13. circuit according to claim 8 is characterized in that: this two discharge path respectively has a switch that is made of driving component.
14. circuit according to claim 10 is characterized in that: this second reference voltage is a ground voltage.
15. circuit according to claim 10 is characterized in that: the reference voltage that this second reference voltage person of being to use is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01135079 CN1226713C (en) | 2001-11-19 | 2001-11-19 | Circuit and method for quick eliminating off afterimage of liquid crystel display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01135079 CN1226713C (en) | 2001-11-19 | 2001-11-19 | Circuit and method for quick eliminating off afterimage of liquid crystel display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1420483A CN1420483A (en) | 2003-05-28 |
| CN1226713C true CN1226713C (en) | 2005-11-09 |
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ID=4672935
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01135079 Expired - Fee Related CN1226713C (en) | 2001-11-19 | 2001-11-19 | Circuit and method for quick eliminating off afterimage of liquid crystel display |
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| Country | Link |
|---|---|
| CN (1) | CN1226713C (en) |
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| US7505035B2 (en) * | 2004-04-19 | 2009-03-17 | Oki Semiconductor Co., Ltd. | Power-down circuit for a display device |
| KR100539264B1 (en) | 2004-05-15 | 2005-12-27 | 삼성전자주식회사 | Detection circuit capable of removing source voltage and display device |
| JP4290680B2 (en) | 2004-07-29 | 2009-07-08 | シャープ株式会社 | Capacitive load charge / discharge device and liquid crystal display device having the same |
| CN100433094C (en) * | 2005-08-15 | 2008-11-12 | 中华映管股份有限公司 | Reducing dent device suitable to display, and relevant metod for reducing dent |
| CN100403392C (en) * | 2005-08-26 | 2008-07-16 | 群康科技(深圳)有限公司 | System for modifying close remain image of liquid crystal display |
| CN100362561C (en) * | 2005-10-10 | 2008-01-16 | 深圳创维－Rgb电子有限公司 | TV set LCD time sequence controlling method during standby |
| CN100430991C (en) * | 2005-12-27 | 2008-11-05 | 元太科技工业股份有限公司 | Method for eliminating remnant shadow of display unit |
| KR101217226B1 (en) * | 2006-01-27 | 2012-12-31 | 삼성전자주식회사 | Display device capable of reducing afterimage and afterimage reduction method thereof |
| KR101480313B1 (en) * | 2006-12-29 | 2015-01-08 | 엘지디스플레이 주식회사 | Liquid crystal display |
| CN101364390B (en) * | 2007-08-10 | 2012-07-04 | 奇美电子股份有限公司 | Planar display |
| CN101369403B (en) * | 2007-08-17 | 2010-04-14 | 北京京东方光电科技有限公司 | Drain discharging apparatus and method for improving twinkling at start |
| CN101556776B (en) * | 2008-04-10 | 2011-06-08 | 北京京东方光电科技有限公司 | Driving circuit for realizing rapid discharge of pixel thin film transistor |
| CN101826309B (en) * | 2009-03-06 | 2011-12-28 | 华映视讯（吴江）有限公司 | Liquid crystal display with shutdown afterimage elimination function |
| CN103869516B (en) | 2014-03-12 | 2016-04-06 | 京东方科技集团股份有限公司 | display panel discharge circuit and display device |
| CN109461422B (en) * | 2018-12-28 | 2020-12-29 | 惠科股份有限公司 | Discharge control circuit and display device |
| CN112051783A (en) * | 2020-09-22 | 2020-12-08 | 禹创半导体(深圳)有限公司 | A forced pull-to-ground for data output in a power-free mode |
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2001
- 2001-11-19 CN CN 01135079 patent/CN1226713C/en not_active Expired - Fee Related
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|---|---|
| CN1420483A (en) | 2003-05-28 |
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Owner name: JILEDA SCI-TECH CO., LTD. Free format text: FORMER OWNER: HUABANG ELECTRONICS CO., LTD. Effective date: 20061124 |
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Effective date of registration: 20061124 Address after: Taiwan Hsinchu Science Park China Dusing Road No. 2 Patentee after: Qileda Science and Technology Co., Ltd. Address before: Taiwan, China Patentee before: Huabang Electronics Co., Ltd. |
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