CN103065599A - Liquid crystal display capable of eliminating power off remained shadow - Google Patents
Liquid crystal display capable of eliminating power off remained shadow Download PDFInfo
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- CN103065599A CN103065599A CN 201310002711 CN201310002711A CN103065599A CN 103065599 A CN103065599 A CN 103065599A CN 201310002711 CN201310002711 CN 201310002711 CN 201310002711 A CN201310002711 A CN 201310002711A CN 103065599 A CN103065599 A CN 103065599A
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Abstract
The invention provides a liquid crystal display capable of eliminating power off remained shadow. The liquid crystal display capable of eliminating power off the remained shadow comprises a power source module set and a control module set. The power source module set comprises a voltage detector, an interrupting trigger, a logical calculus module set and an electrical level shifter. The voltage detector is used for detecting supply voltage, comparing the supply voltage with threshold voltage and outputting a first control signal. The interrupting trigger is used for receiving a trigger enable signal and outputting a corresponding second control signal. The logic calculus module set is used for receiving the first control signal and the second control signal and outputting a delaying enable signal according to a preset logic rule. The electrical level shifter is used for receiving a first gate drive signal and the delaying enable signal and outputting a delayed second gate drive signal. The control module set is used for setting delaying time and outputting the delaying time to the interrupting trigger. According to the liquid crystal display capable of eliminating power off the remained shadow, the first control signal and the second control signal are respectively output through the voltage detector and the interrupting trigger. The delaying enable signal is output based on the logic rule between the voltage detector and the interrupting trigger. Remained electric charge in a liquid crystal electric capacitance can be discharged in sufficient time so that the remained shadow in the process of powering off is eliminated.
Description
Technical field
The present invention relates to a kind of liquid crystal display, relate in particular to a kind of liquid crystal display of eliminating power-off ghost shadow.
Background technology
Current, flat-panel screens such as liquid crystal display (Liquid Crystal Display, LCD) etc., owing to have the advantages such as high image quality, volume are little, lightweight, low driving voltage, low consumpting power, therefore be widely used in personal digital assistant (PersonalDigital Assistant, PDA), consumer communication or the electronic products such as mobile phone, notebook computer, desktop display, vehicle display and projection TV, and replace gradually cathode-ray tube (CRT) (Cathode Ray Tube, CRT) and become the main flow of display.
In general liquid crystal display framework; after the liquid crystal display shutdown; often can see afterimage at display panels; sometimes even after needing to wait for the several seconds just can disappear; this kind phenomenon not only is an impediment to user's visual experience, with the passing of time more can reduce the display quality of display panels.With thin film transistor (TFT) (Thin Film Transistor, TFT) liquid crystal display is example, causing the one of the main reasons of power-off ghost shadow (residual image) phenomenon is to be, the velocity of discharge of the pixel electrode of Thin Film Transistor-LCD is too slow, so that electric charge can't discharge fast and remains in the liquid crystal capacitance after the shutdown, must be after complete discharge off of a period of time.And just in this section discharge process, the user often sees the power-off ghost shadow on the display panels.
In order effectively to improve power off afterimage phenomenon, a solution of the prior art is to be, when shutdown, voltage detecting circuit detects the operating voltage VCC that receives and is reduced to a predetermined voltage potential, the pass machine control signal of exporting is converted to a low-potential voltage by a high-potential voltage, and so that the gate drive signal of gate drivers output is converted to high-potential voltage, thereby come the thin film transistor (TFT) of each pixel in the conducting liquid crystal panel by the gate drive signal of this noble potential.Thus, before closing the liquid crystal display power supply, remaining electric charge in the liquid crystal capacitance of each pixel can be by the thin film transistor (TFT) of conducting state and the data line rapid discharge that is electrically connected with this thin film transistor (TFT), and then shorten the time that remaining electric charge discharges fully, eliminate to a certain extent the phenomenon of power-off ghost shadow.
Yet when utilizing gate drive signal to control the thin film transistor (TFT) turn-on and turn-off, its threshold voltage VGH, VGL are converted to by operating voltage VCC.When operating voltage VCC descended, threshold voltage VGH, VGL also can descend thereupon, even come the thin film transistor (TFT) of each pixel of conducting by this gate drive signal, the internal charge of liquid crystal capacitance still can not get discharging fully.When starting shooting next time, the situations such as image residue or common electric voltage drift still can appear.
In view of this, how to design a kind of liquid crystal display of eliminating power-off ghost shadow, to address the aforementioned drawbacks or deficiency, thereby the display quality that keeps display panels, prolong the serviceable life of display panels, improving user's visual experience, is a problem needing to be resolved hurrily of person skilled in the industry.
Summary of the invention
For liquid crystal display of the prior art existing defects when solving power-off ghost shadow, the invention provides liquid crystal display a kind of novelty, that can eliminate power-off ghost shadow.
According to one aspect of the present invention, a kind of liquid crystal display of eliminating power-off ghost shadow is provided, comprising:
One power supply module comprises:
One voltage-level detector in order to receiving a supply voltage, and compares described supply voltage and a threshold voltage, exports one first control signal according to comparative result;
One interrupt flip-flop triggers enable signal in order to receive one, and output one second control signal corresponding with described triggering enable signal;
One logical operation module in order to receiving described the first control signal and described the second control signal, and is exported a time-delay enable signal according to the predetermined logic rule; And
One level shifter drive signal and described time-delay enable signal in order to receive a first grid, and the second grid after the output delay drives signal; And
One control module is electrically connected with described interrupt flip-flop, and described control module is in order to setting a delay time, and exports described delay time to described interrupt flip-flop.
Preferably, when described supply voltage was lower than described threshold voltage and described triggering enable signal and is high level, described the second control signal was low level, and described time-delay enable signal is described the first control signal.
Preferably, when described supply voltage was higher than described threshold voltage and described triggering enable signal and is the negative edge signal, described the first control signal was low level, and described time-delay enable signal is described the second control signal.
Preferably, when described supply voltage is higher than described threshold voltage and described triggering enable signal and is a plurality of pulse signal, the priority of described the second control signal is higher than the priority of described the first control signal, and described second grid drives signal and postpones described delay time from each negative edge of described triggering enable signal constantly.More preferably, trigger between adjacent two pulses in the enable signal interval greater than described delay time.
Preferably, supply voltage is 3.3V, and described threshold voltage is 2V.
Preferably, this liquid crystal display comprises that also the array basal plate row drives (Gate driverOn Array, GOA) circuit, drives signal in order to receive described second grid.
According to another aspect of the present invention, a kind of liquid crystal display of eliminating power-off ghost shadow is provided, comprising:
One power supply module comprises:
One voltage-level detector in order to receiving a supply voltage, and compares described supply voltage and a threshold voltage, exports one first control signal according to comparative result;
One processes module, triggers enable signal and described the first control signal in order to receive one, and exports a time-delay enable signal; And
One level shifter drive signal and described time-delay enable signal in order to receive a first grid, and the second grid after the output delay drives signal; And
One control module is electrically connected with described processing module, and described control module is in order to setting a delay time, and exports described delay time to described processing module,
Wherein, described second grid driving signal carries out delay process according to described time-delay enable signal and described delay time.
Preferably, above-mentioned threshold voltage is 2V, when described supply voltage is lower than 2V and described triggering enable signal and is high level, drives signal by the described second grid after the output delay of described time-delay enable signal.
Preferably, when supply voltage is higher than threshold voltage and triggers enable signal when being the negative edge signal, drive signal by this second grid after the output delay of time-delay enable signal.
Adopt the liquid crystal display of eliminating power-off ghost shadow of the present invention, receive a supply voltage by voltage-level detector, and this supply voltage and a threshold voltage compared to export one first control signal, and by interrupt flip-flop reception one triggering enable signal, and export corresponding one second control signal, then export a time-delay enable signal based on the logic rules of this first control signal and this second control signal, and then export again the array base palte horizontal drive circuit to after gate drive signal postponed, thin film transistor (TFT) with each pixel in the control display panels is opened, remaining electric charge in the liquid crystal capacitance of this pixel is discharged fully by data line, therefore can effectively eliminate power off afterimage phenomenon.
Description of drawings
The reader will become apparent various aspects of the present invention after the reference accompanying drawing has been read the specific embodiment of the present invention.Wherein,
Fig. 1 illustrates the structural drawing of liquid crystal display of the power-off ghost shadow eliminated of prior art;
Fig. 2 illustrates in the liquid crystal display of Fig. 1, is used for eliminating the waveform synoptic diagram of the key signal of power-off ghost shadow;
Fig. 3 illustrates according to one embodiment of the present invention, can eliminate the structural representation of the liquid crystal display of power-off ghost shadow;
Fig. 4 (a) illustrates the waveform synoptic diagram of first embodiment of liquid crystal display when eliminating power-off ghost shadow among Fig. 3;
Fig. 4 (b) illustrates the waveform synoptic diagram of second embodiment of liquid crystal display when eliminating power-off ghost shadow among Fig. 3;
Fig. 4 (c) illustrates the waveform synoptic diagram of three embodiment of liquid crystal display when eliminating power-off ghost shadow among Fig. 3; And
Fig. 5 illustrates according to another embodiment of the present invention, can eliminate the structural representation of the liquid crystal display of power-off ghost shadow.
Embodiment
For technology contents that the application is disclosed is more detailed and complete, can be with reference to accompanying drawing and following various specific embodiments of the present invention, identical mark represents same or analogous assembly in the accompanying drawing.Yet those of ordinary skill in the art should be appreciated that the embodiment that hereinafter provides limits the scope that the present invention is contained.In addition, accompanying drawing only is used for schematically being illustrated, and does not draw according to its life size.
Fig. 1 illustrates the structural drawing of liquid crystal display of the power-off ghost shadow eliminated of prior art, and Fig. 2 illustrates in the liquid crystal display of Fig. 1, is used for eliminating the waveform synoptic diagram of the key signal of power-off ghost shadow.
With reference to Fig. 1, for the power off afterimage phenomenon of liquid crystal display, it comprises a power supply module 10.This power supply module 10 has a voltage-level detector 101 and a level shifter 103.Wherein, voltage-level detector 101 receives a supply voltage Vin, and supply voltage Vin and a threshold voltage are compared, and exports a control signal Xon_Enable according to comparative result.Level shifter 103 is electrically connected to voltage-level detector 101, and it receives a gate drive signal CKx and from the control signal of voltage-level detector 101, and the gate drive signal CKX after the output delay.
Specifically, voltage-level detector 101 inside arrange a voltage comparator (not shown), and this voltage comparator compares supply voltage Vin and a threshold voltage.For example, supply voltage under the normal operating conditions is 3.3V, lower threshold voltage is 2V, when detecting the virtual voltage Vin that receives, voltage-level detector 101 is reduced to threshold voltage 2V or 2V when following, come delay strategy in the triggering level shift unit 103 by control signal Xon_Enable, make the internal charge of the liquid crystal capacitance in each pixel obtain to a certain degree release.Yet when utilizing gate drive signal CKX to control the thin film transistor (TFT) turn-on and turn-off corresponding with liquid crystal capacitance, its threshold voltage VGH, VGL also are converted to by supply voltage Vin.When supply voltage Vin descends, threshold voltage VGH, VGL also can descend (as shown in Figure 2) thereupon, even come the thin film transistor (TFT) of each pixel of conducting by this gate drive signal, because gate drive voltage is lower, the internal charge of liquid crystal capacitance still can not get discharging fully.When starting shooting next time, the situations such as image residue or common electric voltage drift still can appear.
In order to solve defects of the prior art or deficiency, Fig. 3 illustrates according to one embodiment of the present invention, can eliminate the structural representation of the liquid crystal display of power-off ghost shadow.
With reference to Fig. 3, the liquid crystal display of eliminating power-off ghost shadow of the present invention comprises a power supply module 20 and a control module 30.Wherein, control module 30 is electrically connected with power supply module 20, and this control module 30 is in order to setting a delay time T, and exports this delay time T to power supply module 20.
In one embodiment, this liquid crystal display comprises that also the array basal plate row drives (Gate driver On Array, GOA) circuit, receives this second grid by this GOA circuit and drives signal CKX.
Fig. 4 (a) illustrates the waveform synoptic diagram of first embodiment of liquid crystal display when eliminating power-off ghost shadow among Fig. 3.
With reference to Fig. 4 (a), RST represents reset signal, and CKX represents that the second grid of level shifter 203 outputs drives signal, and CKx represents that the first grid that level shifter 203 receives drives signal.For instance, when liquid crystal display works to show image or picture, supply voltage Vin is 3.3V, reset signal RST is high level, triggering enable signal S1 is high level, time-delay enable signal Xon_Enable is for forbidding (Disable) state that enables, and the first grid driving signal CKx of level shifter input and the second grid of output drive between the signal CKX and there is no delay time.
In this embodiment, when supply voltage Vin is lower than threshold voltage (such as 2V) and trigger enable signal S1 still for high level, shown in dotted line among Fig. 4 (a), do not form pulse negative edge signal owing to trigger enable signal S1, thereby the second control signal CT2 of interrupt flip-flop 205 outputs is low level.Thus, time-delay enable signal Xon_Enable is corresponding to the first control signal CT1, that is, when supply voltage Vin is lower than threshold voltage, second grid drives signal CKX and begins the delay time (shown in the dotted line right side among the figure) that postpones to be scheduled to, and this delay time is arranged or change by control module 30.
Fig. 4 (b) illustrates the waveform synoptic diagram of second embodiment of liquid crystal display when eliminating power-off ghost shadow among Fig. 3.
With reference to Fig. 4 (b), in this embodiment, when supply voltage Vin is higher than threshold voltage and triggers enable signal S1 when the negative edge signal occurring, because supply voltage Vin does not drop to threshold voltage, thereby the first control signal CT1 of voltage-level detector 201 outputs is low level.Thus, time-delay enable signal Xon_Enable is corresponding to the second control signal CT2, that is, when the negative edge signal appears in triggering enable signal S1, second grid drives signal CKX and begins the delay time (shown in the vertical line frame among the figure) that postpones to be scheduled to, and this delay time is also arranged or change by control module 30.
Fig. 4 (c) illustrates the waveform synoptic diagram of three embodiment of liquid crystal display when eliminating power-off ghost shadow among Fig. 3.
With reference to Fig. 4 (c), in this embodiment, triggering enable signal S1 is a plurality of pulse signals, comprises an aperature delay between adjacent pulse.When supply voltage Vin is higher than threshold voltage and triggers enable signal S1 when being a plurality of pulse signal, the priority of the second control signal CT2 is higher than the priority of the first control signal CT1, second grid drives signal CKX and postpones a predetermined delay time from each negative edge that triggers enable signal S1 constantly, and this delay time is arranged or change by control module 30.Afterwards, if supply voltage Vin is lower than threshold voltage, before started time-delay enable signal Xon_Enable owing to trigger the negative edge of enable signal S1, and needn't drive signal CKX to second grid again this moment and postpone.
In one embodiment, trigger between adjacent two pulses among the enable signal S1 interval greater than the set delay time of control module 30.
In above-described embodiment, for the normal running mechanism of the enable signal Xon_Enable that keeps originally delaying time, the priority of the second control signal CT2 is higher than the priority of the first control signal CT1 in the predetermined logic rule that logical operation module 207 adopts.That is to say that when the second control signal CT2 triggered, the first control signal CT1 namely no longer triggered the origin operation function.The signal of above-mentioned predetermined logic rule, such as following table 1:
| INPUT?CT1 | INPUT?CT2 | OUTPUT?Logic |
| CT1 | 0 | CT1 |
| 0 | CT2 | CT2 |
| CT1 | CT2 | CT2 |
Table 1
Fig. 5 illustrates according to another embodiment of the present invention, can eliminate the structural representation of the liquid crystal display of power-off ghost shadow.
The key distinction of Fig. 5 and Fig. 3 is to be, power supply module 20 comprises that one processes module 209.This is processed module 209 and receives one and trigger enable signal S1 and from the first control signal CT1 of voltage-level detector 201, and exports a time-delay enable signal Xon_Enable.That is to say, the function that processed module 209 compatibilities interrupt flip-flop 205 among Fig. 3 and logical operation module 207 realized separately, and export this time-delay enable signal Xon_Enable to level shifter 203.
In one embodiment, if the corresponding threshold voltage of supply voltage Vin is 2V, when supply voltage Vin is lower than 2V and triggers enable signal S1 when being high level, drive signal CKX by the second grid after the time-delay enable signal Xon_Enable output delay.
In one embodiment, when supply voltage Vin is higher than threshold voltage and triggers enable signal S1 when being the negative edge signal, drive signal CKX by the second grid after the time-delay enable signal Xon_Enable output delay.
Adopt the liquid crystal display of eliminating power-off ghost shadow of the present invention, receive a supply voltage by voltage-level detector, and this supply voltage and a threshold voltage compared to export one first control signal, and by interrupt flip-flop reception one triggering enable signal, and export corresponding one second control signal, then export a time-delay enable signal based on the logic rules of this first control signal and this second control signal, and then export again the array base palte horizontal drive circuit to after gate drive signal postponed, thin film transistor (TFT) with each pixel in the control display panels is opened, remaining electric charge in the liquid crystal capacitance of this pixel is discharged fully by data line, therefore can effectively eliminate power off afterimage phenomenon.
Above, describe the specific embodiment of the present invention with reference to the accompanying drawings.But those skilled in the art can understand, and in situation without departing from the spirit and scope of the present invention, can also do various changes and replacement to the specific embodiment of the present invention.These changes and replacement all drop in claims limited range of the present invention.
Claims (10)
1. the liquid crystal display that can eliminate power-off ghost shadow is characterized in that, described liquid crystal display comprises:
One power supply module comprises:
One voltage-level detector in order to receiving a supply voltage, and compares described supply voltage and a threshold voltage, exports one first control signal according to comparative result;
One interrupt flip-flop triggers enable signal in order to receive one, and output one second control signal corresponding with described triggering enable signal;
One logical operation module in order to receiving described the first control signal and described the second control signal, and is exported a time-delay enable signal according to the predetermined logic rule; And
One level shifter drive signal and described time-delay enable signal in order to receive a first grid, and the second grid after the output delay drives signal; And
One control module is electrically connected with described interrupt flip-flop, and described control module is in order to setting a delay time, and exports described delay time to described interrupt flip-flop.
2. liquid crystal display according to claim 1, it is characterized in that, when described supply voltage was lower than described threshold voltage and described triggering enable signal and is high level, described the second control signal was low level, and described time-delay enable signal is described the first control signal.
3. liquid crystal display according to claim 1, it is characterized in that, when described supply voltage was higher than described threshold voltage and described triggering enable signal and is the negative edge signal, described the first control signal was low level, and described time-delay enable signal is described the second control signal.
4. liquid crystal display according to claim 1, it is characterized in that, when described supply voltage is higher than described threshold voltage and described triggering enable signal and is a plurality of pulse signal, the priority of described the second control signal is higher than the priority of described the first control signal, and described second grid drives signal and postpones described delay time from each negative edge of described triggering enable signal constantly.
5. liquid crystal display according to claim 4 is characterized in that, between adjacent two pulses in the described triggering enable signal interval greater than described delay time.
6. liquid crystal display according to claim 1 is characterized in that, described supply voltage is 3.3V, and described threshold voltage is 2V.
7. liquid crystal display according to claim 1 is characterized in that, described liquid crystal display comprises that also the array basal plate row drives (Gate driver On Array, GOA) circuit, drives signal in order to receive described second grid.
8. the liquid crystal display that can eliminate power-off ghost shadow is characterized in that, described liquid crystal display comprises:
One power supply module comprises:
One voltage-level detector in order to receiving a supply voltage, and compares described supply voltage and a threshold voltage, exports one first control signal according to comparative result;
One processes module, triggers enable signal and described the first control signal in order to receive one, and exports a time-delay enable signal; And
One level shifter drive signal and described time-delay enable signal in order to receive a first grid, and the second grid after the output delay drives signal; And
One control module is electrically connected with described processing module, and described control module is in order to setting a delay time, and exports described delay time to described processing module,
Wherein, described second grid driving signal carries out delay process according to described time-delay enable signal and described delay time.
9. liquid crystal display according to claim 8, it is characterized in that, described threshold voltage is 2V, when described supply voltage is lower than 2V and described triggering enable signal and is high level, drives signal by the described second grid after the output delay of described time-delay enable signal.
10. liquid crystal display according to claim 8, it is characterized in that, when described supply voltage is higher than described threshold voltage and described triggering enable signal and is the negative edge signal, drive signal by the described second grid after the output delay of described time-delay enable signal.
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| CN103218967A (en) * | 2013-04-25 | 2013-07-24 | 京东方科技集团股份有限公司 | Ghosting image eliminating circuit and display device |
| CN104795040A (en) * | 2015-04-30 | 2015-07-22 | 京东方科技集团股份有限公司 | Array substrate, display device and shutdown ghost improving circuit for display device |
| CN105161065A (en) * | 2015-09-30 | 2015-12-16 | 深圳市华星光电技术有限公司 | LCD signal control circuit, display panel and display device |
| WO2016138686A1 (en) * | 2015-03-03 | 2016-09-09 | 深圳市华星光电技术有限公司 | Level shift circuit of goa framework liquid crystal panel and level shift method |
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| CN103218967B (en) * | 2013-04-25 | 2015-07-29 | 京东方科技集团股份有限公司 | A kind of elimination ghost circuit and display device |
| CN103218967A (en) * | 2013-04-25 | 2013-07-24 | 京东方科技集团股份有限公司 | Ghosting image eliminating circuit and display device |
| US9483994B2 (en) | 2014-05-14 | 2016-11-01 | Au Optronics Corp. | Liquid crystal display and gate discharge control circuit thereof |
| US9767758B2 (en) | 2014-12-02 | 2017-09-19 | Boe Technology Group Co., Ltd. | Driving apparatus of display panel and driving method thereof, display device |
| WO2016138686A1 (en) * | 2015-03-03 | 2016-09-09 | 深圳市华星光电技术有限公司 | Level shift circuit of goa framework liquid crystal panel and level shift method |
| CN104795040A (en) * | 2015-04-30 | 2015-07-22 | 京东方科技集团股份有限公司 | Array substrate, display device and shutdown ghost improving circuit for display device |
| CN104795040B (en) * | 2015-04-30 | 2017-05-10 | 京东方科技集团股份有限公司 | Array substrate, display device and shutdown ghost improving circuit for display device |
| CN105161065A (en) * | 2015-09-30 | 2015-12-16 | 深圳市华星光电技术有限公司 | LCD signal control circuit, display panel and display device |
| CN106169289B (en) * | 2016-09-27 | 2019-01-04 | 深圳市华星光电技术有限公司 | A kind of array substrate horizontal drive circuit and its over-current protection method, liquid crystal display |
| CN106169289A (en) * | 2016-09-27 | 2016-11-30 | 深圳市华星光电技术有限公司 | A kind of array base palte horizontal drive circuit and over-current protection method, liquid crystal display |
| CN107068036A (en) * | 2017-04-11 | 2017-08-18 | 京东方科技集团股份有限公司 | A kind of drive circuit of display panel, display device and driving method |
| CN107068036B (en) * | 2017-04-11 | 2019-08-20 | 京东方科技集团股份有限公司 | A kind of driving circuit of display panel, display device and driving method |
| CN108305592A (en) * | 2018-02-14 | 2018-07-20 | 京东方科技集团股份有限公司 | Driving unit, display panel and the display device of synchronism output |
| CN110570823A (en) * | 2019-02-22 | 2019-12-13 | 友达光电股份有限公司 | Time schedule controller, display device and picture display method |
| CN114038365A (en) * | 2021-11-29 | 2022-02-11 | 京东方科技集团股份有限公司 | Display panel detection method, device, equipment and storage medium |
| CN114038365B (en) * | 2021-11-29 | 2023-12-26 | 京东方科技集团股份有限公司 | Display panel detection method, device, equipment and storage medium |
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Application publication date: 20130424 |