CN1447306A - Control device and method for eliminating ghost on panels of liquid crystal - Google Patents
Control device and method for eliminating ghost on panels of liquid crystal Download PDFInfo
- Publication number
- CN1447306A CN1447306A CN 02108108 CN02108108A CN1447306A CN 1447306 A CN1447306 A CN 1447306A CN 02108108 CN02108108 CN 02108108 CN 02108108 A CN02108108 A CN 02108108A CN 1447306 A CN1447306 A CN 1447306A
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- circuit
- voltage
- liquid crystal
- ghost
- panels
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- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A liquid crystal panel residual image elliminating control device includes a detection circuit, a comparator, a control circuit and a discharge circuit electrically connected orderly. It's method includes the following steps: firstly, the detection circuit detects the start signals, the comparator compares the reference voltage and the earthing voltage to detect the switching-off operation of the supply voltage drop. When the reference voltage is lower than the earthing voltage, the control circuit drives the discharge circuit to release charge in steady-state capacitance in LCD panel to get the aim of eliminating residual image.
Description
Technical field
The present invention relates to a kind of liquid crystal panel controller and method, particularly eliminate control device and method, be applicable to when closing the LCD power supply, obtain better visual effect about a kind of ghost on panels of liquid crystal.
Background technology
In LCD panel control circuit, (it (for example: V produces driving voltage by a voltage generation circuit to for example super twist mode for Super Twist Nematic, STN) liquid crystal panel
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.The basic sequential chart of the known LCD panel driving shown in Fig. 2-1 is simplified illustration, only demonstrates single picture element (pixel) sequential chart when positive pole driving and negative pole driving, among the figure, and V
DD＞V
SS＞V
5COM0 is expressed as first row to output voltage wave, and SEG0 is expressed as first longitudinal voliage output waveform, and both differences (COM0-SEG0) are first liquid crystal pixel voltages output waveform, as previously discussed, its difference produces different change in voltage to show different information.
Please refer to Fig. 2-2 and Fig. 2-3, it illustrates according to the LCD panel plane figure of Fig. 2-1 and LCD voltage generation circuit and stable state electric capacity synoptic diagram thereof, the driving voltage (V of each picture element 15 among Fig. 2-2
1, V
2, V
3, V
4And V
5) need add a stable state electric capacity 13 to keep voltage (V
1, V
2, V
3, V
4And V
5) stable output, shown in Fig. 2-3.Yet, as moment powered-down (V
DD) time, these stable state electric capacity 13 provide the electric power of a period of time because of there being electric charge, make liquid crystal panel stay ghost and do the demonstration that makes mistake, and during to certain low-voltage, panel just can recover normally, thereby influences the visual effect of LCD until the charge loss of electric capacity 13.Because the LCD circuit all is the design of low power consumption now, so ghost phenomena is even more serious.
Way traditionally is to utilize software to give an order by the user earlier panel to be closed, but device to be controlled with the charge loss in the electric capacity after powered-down, this mode there is no to be quickened ghost in fact and eliminates and can postpone the unused time.
Summary of the invention
In view of this, the present invention proposes a kind of ghost on panels of liquid crystal and eliminates control device, when supply voltage descends, when making reference voltage be lower than ground voltage, utilizes a discharge path that the electric charge in the electric capacity is got rid of rapidly to prevent that ghost from taking place.
For achieving the above object, the present invention proposes a kind of ghost on panels of liquid crystal and eliminates control device, its input end connects a LCD power supply and a circuit for generating source voltage, and the logical plate voltage generation circuit of output coupled LCD, characteristics are, comprise: a testing circuit, in order to detect that circuit for generating source voltage has activated and supply voltage is exported an enable signal when having set up; One comparer in order to receive this enable signal and relatively this reference voltage and a ground voltage, when reference voltage is lower than ground voltage, is exported a data-signal; One control circuit receives this enable signal and this data-signal, to export a control signal; And a discharge circuit, in order to receive and this control signal is done voltage level conversion, then provide discharge path to produce the electric charge at least one stable state electric capacity in the circuit to discharge the LCD panel voltage.
Described discharge circuit also comprises: a switchgear, and be coupled to this LCD panel voltage and produce circuit, this switchgear has one to provide a discharge path to discharge the earth terminal of the electric charge in the described stable state electric capacity; And a voltage level conversion device, in order to conversion from the control signal of described control circuit to drive this switchgear; Described testing circuit by one or the door constitute; Described control circuit is a single-shot trigger circuit; Described voltage level conversion device is a potential transferring devices; Described liquid crystal panel is a STN (Super TwistNematic, a super twist mode) liquid crystal panel.
The method that the present invention also provides a kind of ghost on panels of liquid crystal to eliminate comprises the following steps:
Earlier by a testing circuit, activate and driving voltage when having set up at the LCD voltage generation circuit, export enable signal to a comparer and a control circuit; Afterwards, when reference voltage is lower than ground voltage, export a data-signal at this comparer to this control circuit; Then, after this control circuit received this enable signal and this data-signal, output one controlled signal to a discharge circuit; And this discharge circuit is coupled to a LCD panel voltage and produces circuit, when receiving this control signal, utilizes a discharge path to discharge this LCD panel voltage and produces the electric charge in the stable state electric capacity in circuit, eliminates ghost on panels of liquid crystal.
Described discharge circuit also comprises a switchgear and a voltage level conversion device; Described testing circuit by one or the door constitute; Described control circuit is a single-shot trigger circuit; Described voltage level conversion device is a potential transferring devices.
Description of drawings
Fig. 1 illustrates according to the ghost of the embodiment of the invention and eliminates the control device calcspar;
Fig. 2-1 illustrates the basic sequential chart of known LCD panel driving;
Fig. 2-2 illustrates the LCD panel plane figure according to Fig. 2-1.
Fig. 2-3 illustrates according to the LCD voltage generation circuit of Fig. 2-2 and stable state electric capacity synoptic diagram thereof.Number in the figure, symbol description
1～testing circuit; 2～closed condition signal;
3～comparer; 4～set up status signal;
5～control circuit (single-shot trigger circuit); 6～reference voltage;
7～voltage level conversion device (potential transferring devices); 8～ground voltage;
9～switchgear; 11～discharge circuit;
12～LCD panel voltage produces circuit; 13～stable state electric capacity;
14～LCD panel; 15～picture element;
S
1～enable signal; S
2～data-signal;
C
1～control signal.
Embodiment
For allowing above-mentioned and other purpose, feature and the advantage of the present invention can be more apparent, a preferred embodiment cited below particularly, and conjunction with figs. be described in detail below:
The ghost that LCD panel shutdown back is occurred is because the electric charge of stable state electric capacity can't promptly be got rid of institute causes, so the present invention utilizes one to detect power supply (V
DDToward descending) testing circuit and the discharge circuit of a rapid discharge path is provided, use the problem that solves the ghost stop.
Please refer to Fig. 1, ghost according to the embodiment of the invention shown in the figure is eliminated the control device calcspar, be applicable to a LCD panel, STN (Super Twist Nematic for example, super twist mode) liquid crystal panel, it comprises: a testing circuit 1, a comparer 3, a control circuit 5 and a discharge circuit 11.
At first, testing circuit 1, by one or the door (not shown) constituted, its input end is imported two signals, be respectively voltage generation circuit and close that (power down, (start-up) signal 4 during PD) signal 2 and voltage are set up is in order to expression circuit for generating source voltage and driving voltage (V
1, V
2, V
3, V
4, V
5) state, when circuit for generating source voltage need not (PD:high) or power drives voltage (V
1, V
2, V
3, V
4, V
5) when not setting up (start-up:high), ghost of the present invention is eliminated control device and can not moved, to avoid LCD panel voltage generation circuit 12 to drive or operating period generation power consumption situation; As driving voltage (V
1, V
2, V
3, V
4, V
5) when having set up when finishing (start-up:low) and circuit for generating source voltage and activating (PD:low), for example during panel 12 normal runnings, during powered-down, export an enable signal S
1
Then, comparer 3 is coupled to testing circuit 1, its positive input terminal input reference voltage 6, negative input end input grounding voltage (V
Ss) 8, the level of this reference voltage 6 can change along with supply voltage, but its voltage difference is (for example 2.IV) that fixes, when therefore voltage descends, ground voltage 8 (0V) is if less than the reference voltage 6 of the mains voltage level during the normal running (for example: supply voltage 2.4V, reference voltage 0.3V), discharge circuit 11 can not activate.Receiving enable signal S
1After, comparer 3 comparison reference voltages 6 and ground voltage 8 because reference voltage 6 is along with mains voltage variations, when the reference voltage 6 of the voltage level of ground voltage 8 during greater than power-off (for example: supply voltage 2.0V, reference voltage-0.1V), comparer 3 outputs this moment one data-signal S
2
Subsequently, control circuit 5 is coupled to testing circuit 1 and comparer 3, is receiving enable signal S
1And data-signal S
2After, export a control signal C
1This control circuit 5 is made of a single-shot trigger circuit (one-shotcircuit), and purpose can clearly be carried out subsequent action after received signal, is not subjected to from the noise of comparer 3 and produces misoperation.
At last, discharge circuit 11 is coupled to single-shot trigger circuit 5 and LCD panel voltage and produces between the circuit 12, in order to reception and with control signal C
1Do voltage level conversion, then provide discharge path to produce the electric charge at least one stable state electric capacity (not shown) in the circuit 12 to discharge the LCD panel voltage.Above-mentioned discharge circuit 11 comprises: a switchgear 9 and a voltage level conversion device 7, wherein switchgear 9 is coupled to the LCD panel voltage and produces circuit 12, and an end ground connection is arranged, provide a discharge path to discharge the electric charge that the LCD panel voltage produces at least one stable state electric capacity (not shown) in the circuit 12 by this.This voltage level conversion device 7 is coupled between single-shot trigger circuit 5 and the switchgear 9, is a potential transferring devices (levelshifter), because control signal C
1Be a low voltage signal, yet the voltage of LCD panel voltage generation circuit 12 is higher, therefore needs by potential transferring devices 7 control signal C
1Do voltage level conversion and discharge electric charge with off switch device 9.
As previously discussed, the method according to a kind of ghost on panels of liquid crystal of the embodiment of the invention is eliminated comprises the following steps: by a testing circuit 1, activates and driving voltage when having set up at the LCD voltage generation circuit, exports an enable signal S
1To a comparer 3 and a single-shot trigger circuit 5; Comparer 3 comparison reference voltages 6 and ground voltage 8 when being lower than ground voltage 8 as if reference voltage 6, are exported a data-signal S
2To single-shot trigger circuit 5; Single-shot trigger circuit 5 receives enable signal S
1And data-signal S
2Afterwards, export a control signal C
1To a potential transferring devices 7; Potential transferring devices 7 is receiving this control signal C
1The time, with control signal C
1Do voltage level conversion with off switch device 9, use and discharge the LCD panel voltage and produce in the circuit 12 electric charge in the stable state electric capacity and eliminate ghost on panels of liquid crystal.
Though the present invention with preferred embodiment openly as above; but it is not to be used for limiting scope of the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; should do some and change and retouching, so protection scope of the present invention should be as the criterion with the scope that claims were defined of present patent application.
Claims (11)
1. a ghost on panels of liquid crystal is eliminated control device, and its input end connects a LCD power supply and a circuit for generating source voltage, and the logical plate voltage generation circuit of output coupled LCD is characterized in that, comprising:
One testing circuit is in order to detect that circuit for generating source voltage has activated and supply voltage is exported an enable signal when having set up;
One comparer in order to receive this enable signal and relatively this reference voltage and a ground voltage, when reference voltage is lower than ground voltage, is exported a data-signal;
One control circuit receives this enable signal and this data-signal, to export a control signal; And
One discharge circuit in order to receive and this control signal is done voltage level conversion, then provides discharge path to produce the electric charge at least one stable state electric capacity in the circuit to discharge the LCD panel voltage.
2. ghost on panels of liquid crystal as claimed in claim 1 is eliminated control device, it is characterized in that described discharge circuit also comprises:
One switchgear is coupled to this LCD panel voltage and produces circuit, and this switchgear has one to provide a discharge path to discharge the earth terminal of the electric charge in the described stable state electric capacity; And
One voltage level conversion device, its conversion from the control signal of described control circuit to drive this switchgear.
3. ghost on panels of liquid crystal as claimed in claim 1 is eliminated control device, it is characterized in that, described testing circuit by one or door constitute.
4. ghost on panels of liquid crystal as claimed in claim 1 is eliminated control device, it is characterized in that described control circuit is a single-shot trigger circuit.
5. ghost on panels of liquid crystal as claimed in claim 1 is eliminated control device, it is characterized in that described voltage level conversion device is a potential transferring devices.
6. ghost on panels of liquid crystal as claimed in claim 1 is eliminated control device, it is characterized in that described liquid crystal panel is a stn liquid crystal panel.
7. the method that ghost on panels of liquid crystal is eliminated comprises the following steps:
Earlier by a testing circuit, activate and driving voltage when having set up at the LCD voltage generation circuit, export enable signal to a comparer and a control circuit;
Afterwards, when reference voltage is lower than ground voltage, export a data-signal at this comparer to this control circuit;
Then, after this control circuit received this enable signal and this data-signal, output one controlled signal to a discharge circuit; And
This discharge circuit is coupled to a LCD panel voltage and produces circuit, when receiving this control signal, utilizes a discharge path to discharge this LCD panel voltage and produces the electric charge in the stable state electric capacity in the circuit, eliminates ghost on panels of liquid crystal.
8. the method that ghost on panels of liquid crystal as claimed in claim 7 is eliminated is characterized in that described discharge circuit also comprises a switchgear and a voltage level conversion device.
9. the method that ghost on panels of liquid crystal as claimed in claim 7 is eliminated is characterized in that, described testing circuit by one or door constitute.
10. the method that ghost on panels of liquid crystal as claimed in claim 7 is eliminated is characterized in that described control circuit is a single-shot trigger circuit.
11. the method that ghost on panels of liquid crystal as claimed in claim 8 is eliminated is characterized in that described voltage level conversion device is a potential transferring devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02108108 CN1447306A (en) | 2002-03-26 | 2002-03-26 | Control device and method for eliminating ghost on panels of liquid crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02108108 CN1447306A (en) | 2002-03-26 | 2002-03-26 | Control device and method for eliminating ghost on panels of liquid crystal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1447306A true CN1447306A (en) | 2003-10-08 |
Family
ID=28048475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02108108 Pending CN1447306A (en) | 2002-03-26 | 2002-03-26 | Control device and method for eliminating ghost on panels of liquid crystal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1447306A (en) |
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| CN100350441C (en) * | 2004-01-17 | 2007-11-21 | 深圳创维－Rgb电子有限公司 | Intelligent ghost-eliminating method |
| CN100373218C (en) * | 2004-08-09 | 2008-03-05 | 友达光电股份有限公司 | Liquid crystal display and method for improving picture flash and residual picture in turn off process |
| 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 |
| 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 |
| CN100444232C (en) * | 2005-05-28 | 2008-12-17 | 群康科技(深圳)有限公司 | Discharging circuit and liquid crystal panel drive circuit using the discharging circuit |
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| CN101320171B (en) * | 2007-06-08 | 2010-09-29 | 群康科技(深圳)有限公司 | LCD and method for improving power-off ghost |
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| CN102522070A (en) * | 2011-12-24 | 2012-06-27 | 西安启芯微电子有限公司 | Control circuit for eliminating glittering and shutdown ghosting phenomena of thin film field effect transistor |
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| CN100373218C (en) * | 2004-08-09 | 2008-03-05 | 友达光电股份有限公司 | Liquid crystal display and method for improving picture flash and residual picture in turn off process |
| CN100444232C (en) * | 2005-05-28 | 2008-12-17 | 群康科技(深圳)有限公司 | Discharging circuit and liquid crystal panel drive circuit using the discharging circuit |
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