CN102005187B - Liquid crystal displayer and driving circuit thereof - Google Patents

Liquid crystal displayer and driving circuit thereof Download PDF

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Publication number
CN102005187B
CN102005187B CN200910168704A CN200910168704A CN102005187B CN 102005187 B CN102005187 B CN 102005187B CN 200910168704 A CN200910168704 A CN 200910168704A CN 200910168704 A CN200910168704 A CN 200910168704A CN 102005187 B CN102005187 B CN 102005187B
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circuit
coupled
lcd
draws
operating voltage
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CN102005187A (en
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薛涵水
陈致玮
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Himax Technologies Ltd
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Himax Technologies Ltd
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Abstract

The invention discloses a liquid crystal displayer and a driving circuit thereof. When the liquid crystal displayer is turned off, the driving circuit can maintain a voltage input to a logic circuit of the liquid crystal displayer at a low value, so that all thin-film transistors on a liquid crystal panel, after the liquid crystal displayer, is turned off can maintain a longer starting time; therefore, the charge neutralization time of a pixel electrode is prolonged for allowing the residual images on the liquid crystal displayer to disappear completely and quickly.

Description

LCD and driving circuit thereof
Technical field
The present invention relates to a kind of LCD and driving circuit thereof, and be particularly related to a kind of LCD and the driving circuit thereof that can after LCD cuts out, eliminate ghost rapidly and fully.
Background technology
Flat-panel screens; Such as: LCD (Liquid Crystal Display; LCD) etc.; Because have that high image quality, volume are little, in light weight, low driving voltage, with advantage such as low consumpting power, therefore be widely used in personal digital assistant (Personal Digital Assistant, PDA), mobile phone, shoot with video-corder consumer communication or electronic products such as projector, mobile computer, desktop display, automobile-used display and projection TV; And (Cathode Ray Tube CRT) becomes the main flow of display to replace cathode-ray tube (CRT) gradually.
In general LCD framework; On display panels, see afterimage through regular meeting after the LCD shutdown; Sometimes even treat just to disappear after the several seconds, this kind phenomenon not only is not inconsistent the expectation of user's vision, with the passing of time more can reduce the display quality of panel of LCD.With thin film transistor (TFT) (Thin Film Transistor; TFT) LCD is an example; The one of the main reasons that causes power-off ghost shadow (residual image) phenomenon is that the velocity of discharge of Thin Film Transistor-LCD pixel electrode is too slow; So that shutdown back electric charge can't snap-out release and residue in the electric capacity of pixel electrode, and discharge off fully after it must be waited for a period of time again.
Therefore, in LCD, can comprise a reset circuit usually; In order to the supply of the power supply in detection LCD monitor voltage; And according to the height of power supply supply voltage, judge whether LCD to be ready closing, and then control the voltage of a reset signal XAO.Specifically, under the situation of LCD normal power supply, above-mentioned reset signal XAO can be noble potential; And after LCD cut out, above-mentioned reset signal XAO then can be electronegative potential.When reset signal XAO is electronegative potential; If its first operating voltage VDD does not reduce to electronegative potential as yet; Then each the bar sweep trace on the liquid crystal panel of LCD all can be unlocked, and makes the electric charge on its pixel electrode neutralize each other, and has accelerated the speed that ghost is eliminated.
Fig. 1 is the functional block diagram of known LCD.Please with reference to Fig. 1, LCD 100 has reset circuit 10, gate drivers 20 and liquid crystal panel 30.It should be noted that; Only show part comparatively relevant in the LCD 100 among Fig. 1 with the present invention; LCD 100 has other elements in fact in addition, for example: source electrode driver and sequential control circuit, these elements know usually that by tool in the technical field under the present invention the knowledgeable is known; And be the cause of stressing emphasis of the present invention, then omit at this and do not carry.
The output terminal 12 of reset circuit 10 can be exported above-mentioned reset signal XAO to gate drivers 20.Gate drivers 20 has resistance R and logical circuit 40.The two ends of resistance R are coupled to the output terminal 12 of the first operating voltage VDD and reset circuit 10 respectively.The input end of logical circuit 40 also is coupled to the output terminal 12 of reset circuit 10.Logical circuit 40 has elements such as shift register (shift register), output buffer, and in order to when reset signal XAO is electronegative potential, makes its output scanning line voltage V GBe noble potential.As sweep trace voltage V GDuring for noble potential, each bar sweep trace of liquid crystal panel 30 can be noble potential, and makes the thin film transistor (TFT) that each pixel electrode coupled of liquid crystal panel 30 all can be unlocked, and the electric charge that touches each pixel electrode that makes liquid crystal panel 30 neutralizes each other.
Reset circuit 10 has an on-off element 14, in order to when the first operating voltage VDD reduces to a preset value, makes the output terminal 12 of reset circuit 10 be coupled to the second operating voltage VSS.The second operating voltage VSS is generally ground voltage, and is lower than the first operating voltage VDD.After LCD 100 cut out, the first operating voltage VDD promptly can drop near the second operating voltage VSS gradually.Yet, when LCD 100 closes the border and makes the operating voltage VDD that wins fall during the second operating voltage VSS,, and make the inside equivalent resistance R of on-off element 14 of reset circuit 10 because of the first operating voltage VDD diminishes constantly SLittle by little become big.And as inner equivalent resistance R SBecome gradually big during, the voltage of reset signal XAO will be raised.And when the voltage of reset signal XAO is raised a certain current potential, then can make 40 output scanning lines of logical circuit voltage V GBecome electronegative potential, and then cause the thin film transistor (TFT) that each pixel electrode coupled of liquid crystal panel 30 all can be closed, and make the ghost of liquid crystal panel 30 fail fully to eliminate.
Summary of the invention
The present invention provides a kind of driving circuit of LCD, after closing at LCD, eliminates the ghost of LCD effectively.
The present invention provides a kind of LCD, and it has driving circuit, and after closing at LCD, the voltage that prolongs the sweep trace of liquid crystal panel is in the time of noble potential, and makes the ghost of LCD can be complete and promptly eliminate.
The present invention proposes a kind of driving circuit of LCD.Above-mentioned driving circuit comprises and draws high circuit, impact damper, draws and fall circuit and logical circuit.First end that draws high circuit is coupled to first operating voltage.The input end of impact damper is coupled to the output terminal and second end that draws high circuit of reset circuit.Draw first end that falls circuit to be coupled to the output terminal of impact damper, and draw second end that falls circuit to be coupled to second operating voltage.The input end of logical circuit is coupled to the output terminal of impact damper and draws first end that falls circuit.The output terminal of logical circuit is coupled to the liquid crystal panel of LCD.Logical circuit is in order to when drawing first end that falls circuit to be electronegative potential, and the one scan line voltage that the output terminal of logical circuit is exported is noble potential, to eliminate the ghost of liquid crystal panel.Wherein draw and fall circuit and have to draw and fall resistance.Wherein drawing high circuit comprises the P-type mos field effect transistor and draws high resistance.The grid of P-type mos field effect transistor couples second operating voltage, and the source electrode of P-type mos field effect transistor couples first operating voltage.First end that draws high resistance couples a drain electrode of P-type mos field effect transistor, and second end that draws high resistance couples the output terminal of reset circuit and the input end of impact damper.
The present invention proposes a kind of LCD.Above-mentioned LCD comprises liquid crystal panel and driving circuit.Above-mentioned driving circuit comprises and draws high circuit, impact damper, draws and fall circuit and logical circuit.First end that draws high circuit is coupled to first operating voltage.The input end of impact damper is coupled to the output terminal and second end that draws high circuit of reset circuit.Draw first end that falls circuit to be coupled to the output terminal of impact damper, and draw second end that falls circuit to be coupled to second operating voltage.The input end of logical circuit is coupled to the output terminal of impact damper and draws first end that falls circuit.The output terminal of logical circuit is coupled to the liquid crystal panel of LCD.Logical circuit is in order to when drawing first end that falls circuit to be electronegative potential, and the one scan line voltage that the output terminal of logical circuit is exported is noble potential, to eliminate the ghost of liquid crystal panel.Wherein draw and fall circuit and fall resistance and constitute by drawing.Drawing high circuit comprises the P-type mos field effect transistor and draws high resistance.The grid of P-type mos field effect transistor couples second operating voltage, and the source electrode of P-type mos field effect transistor couples first operating voltage.First end that draws high resistance couples a drain electrode of P-type mos field effect transistor, and second end that draws high resistance couples the output terminal of a reset circuit and the input end of impact damper.
In one embodiment of this invention, above-mentioned driving circuit also comprises reset circuit.Reset circuit has output terminal.One second end that draws high circuit is coupled to the output terminal of reset circuit.One input end of impact damper is coupled to the output terminal and second end that draws high circuit of reset circuit.Reset circuit is suitable for exporting a reset signal, and wherein the voltage of reset signal is noble potential when LCD is opened, and after LCD cuts out, is electronegative potential.
In one embodiment of this invention, the resistance value of an inner equivalent resistance of above-mentioned reset circuit becomes big along with the decline of first operating voltage.
In one embodiment of this invention, the first above-mentioned operating voltage is higher than second operating voltage.
In one embodiment of this invention, above-mentioned impact damper comprises the phase inverter of two serial connections.
Based on above-mentioned; The driving circuit of the LCD in the embodiments of the invention can be when above-mentioned inner equivalent resistance becomes big; Still can make the voltage that inputs to logical circuit maintain low-voltage; And make thin film transistor (TFT)s all on the liquid crystal panel after LCD cuts out, can keep the opening time more of a specified duration, and then use with in can prolong with time of the electric charge of pixel electrode, and the ghost of LCD can be eliminated fast and fully.
For letting the above-mentioned feature and advantage of the present invention can be more obviously understandable, hereinafter is special lifts embodiment, and conjunction with figs. elaborates as follows.
Description of drawings
Fig. 1 is the functional block diagram of known LCD.
Fig. 2 is the functional block diagram of the LCD in one embodiment of the invention.
[main element symbol description]
10: reset circuit
12: output terminal
14: on-off element
20: gate drivers
30: liquid crystal panel
40: logical circuit
110: driving circuit
120: draw high circuit
122: the first ends
124: the second ends
130: impact damper
132: input end
134: output terminal
140: draw and fall circuit
142: the first ends
144: the second ends
150: logical circuit
152: input end
154: output terminal
200: LCD
XAO: reset signal
XAO2: voltage
VDD: first operating voltage
VSS: second operating voltage
R: resistance
R H: draw high resistance
R L: draw and fall resistance
R S: inner equivalent resistance
P1:P type metal oxide semiconductor field effect transistor
V G: sweep trace voltage
Embodiment
Fig. 2 is the functional block diagram of the LCD of one embodiment of the invention.Please refer to Fig. 2, the LCD 200 in the present embodiment has liquid crystal panel 30 and driving circuit 110.Driving circuit 110 is in order to the opening and closing of the thin film transistor (TFT) (not illustrating) on the multi-strip scanning line (not illustrating) of control liquid crystal panel 30.Driving circuit 110 has reset circuit 10, draws high circuit 120, impact damper 130, draw and fall circuit 140 and logical circuit 150.It should be noted that; Only show part more relevant with the present invention in the LCD 200 among Fig. 2, LCD 200 has other elements in fact in addition, for example: source electrode driver, sequential control circuit etc.; And be the cause of convenient explanation, then omit at this and do not carry.
Reset circuit 10 has output terminal 12, and is suitable for exporting above-mentioned reset signal XAO.Wherein the voltage of reset signal XAO is noble potential when LCD 200 is opened, and after LCD 200 cuts out, is electronegative potential.First end 122 that draws high circuit 120 is coupled to the first operating voltage VDD, and second end 124 that draws high circuit 120 is coupled to the output terminal 12 of reset circuit 10.The input end 132 of impact damper 130 is coupled to the output terminal 12 and second end 124 that draws high circuit 122 of reset circuit 10.Draw first end 142 that falls circuit 140 to be coupled to the output terminal 134 of impact damper 130, and draw second end 144 that falls circuit 140 to be coupled to the second operating voltage VSS.Wherein, the first operating voltage VDD is generally positive voltage, and the second operating voltage VSS is generally ground voltage.
Logical circuit 150 has elements such as shift register (shift register), output buffer.The input end 152 of logical circuit 150 is coupled to the output terminal 134 of impact damper 130 and draws first end 142 that falls circuit 140.The output terminal 154 of logical circuit 150 is coupled to the liquid crystal panel 30 of LCD 200.Logical circuit 150 is in order to when voltage XAO2 is electronegative potential, the sweep trace voltage V that it is exported GBe noble potential.As sweep trace voltage V GDuring for noble potential; Each bar sweep trace of liquid crystal panel 30 can be noble potential; And make the thin film transistor (TFT) that each pixel electrode coupled of liquid crystal panel 30 all can be unlocked; And impel the electric charge of each pixel electrode of liquid crystal panel 30 to neutralize each other, by this, and then make the ghost of liquid crystal panel 30 be able to after LCD 200 cuts out, be eliminated rapidly and intactly.
The reset signal XAO that the output terminal 12 of reset circuit 10 is exported can be sent to second end 124 that draws high circuit 122 and the input end 132 of impact damper 130.Drawing high circuit 122 comprises P-type mos field effect transistor (PMOSFET) P1 and draws high resistance R HThe grid of P-type mos field effect transistor P1 couples the second operating voltage VSS; The source electrode of P-type mos field effect transistor couples the first operating voltage VDD, and the drain electrode of P-type mos field effect transistor couples and draws high resistance R HAn end.As for drawing high resistance R HThe other end then couple the output terminal 12 of reset circuit 10 and the input end 132 of impact damper 130.In addition, in the present embodiment, draw and fall circuit 140 and have to draw and fall resistance R L
The cause second operating voltage VSS puts on the cause of the grid of P-type mos field effect transistor P1, and P-type mos field effect transistor P1 can open.In addition, when LCD 200 was opened, the on-off element 14 of reset circuit 10 can be closed, so the time reset signal XAO voltage can maintain noble potential.Relatively, in a bit of time after LCD 200 just has been closed, the on-off element 14 of reset circuit 10 can be unlocked, again because of inner equivalent resistance R SResistance value can be very little when LCD 200 has just cut out and can ignore, so the time reset signal XAO the voltage second operating voltage VSS and be in electronegative potential no better than.Yet, after LCD 200 cuts out, along with the elongation of time; The first operating voltage VDD can little by little descend and approach the second operating voltage VSS; And after the first operating voltage VDD diminishes, promptly can influence the conducting degree of on-off element 14, and make inner equivalent resistance R SResistance value become big along with the decline of the first operating voltage VDD.As inner equivalent resistance R SResistance value become big after, the voltage of reset signal XAO also can rise thereupon.
In the present embodiment, the voltage XAO2 that exported of impact damper 130 can because of the voltage of reset signal XAO near the first operating voltage VDD or different near the second operating voltage VSS.Specifically, when the voltage of reset signal XAO during near the first operating voltage VDD, voltage XAO2 can equal the first operating voltage VDD; And when the voltage of reset signal XAO during near the second operating voltage VSS, voltage XAO2 can equal the second operating voltage VSS.In addition, after LCD 200 cuts out, even inner equivalent resistance R SResistance value become big, but because of drawing high resistance R HWith inner equivalent resistance R SThe cause of dividing potential drop, the voltage of reset signal XAO can equal (VDD * R S/ (R H+ R S)).In addition, fall drawing of circuit 140 and fall resistance R because of drawing again LBe coupled to the second operating voltage VSS,, and then make 150 output scanning lines of logical circuit voltage V so after LCD 200 cut out, the voltage XAO2 that impact damper 130 is exported can maintain the second operating voltage VSS GCan keep one long period in noble potential.Therefore; Circuit compared to Fig. 1; Driving circuit 110 through present embodiment; Can make thin film transistor (TFT)s all on the liquid crystal panel 30 after LCD 200 cuts out, can keep the opening time more of a specified duration, so use with in can prolong with time of the electric charge of pixel electrode, and the ghost of LCD can be eliminated fast and fully.
In addition, in another embodiment of the present invention, after LCD 200 cut out, P-type mos field effect transistor P1 also can be closed immediately, and makes the voltage of reset signal XAO equal the second operating voltage VSS.When the voltage of reset signal XAO equals the second operating voltage VSS, draw the voltage XAO2 of first end 142 that falls circuit 140 also can equal the second operating voltage VSS, and make sweep trace voltage V GCan keep the long time in noble potential.
In an embodiment of the present invention, impact damper 130 comprises the phase inverter (not illustrating) of two serial connections, after handling in order to the anti-phase of reset signal XAO being carried out twice, exports above-mentioned voltage XAO2.
In the embodiment of Fig. 2, the drawing high circuit 120, impact damper 130, draw and fall circuit 140 and logical circuit 150 is arranged within the gate drivers 160 of driving circuit 110.Yet the present invention is not as limit.In other embodiment of the present invention, each element of driving circuit 110 can be arranged at outside the gate drivers 160 whole or in part, also can be arranged at whole or in part within the gate drivers 160.
In another embodiment of the present invention, driving circuit 110 can not had a reset circuit 10.In other words, in this embodiment, driving circuit 110 has the circuit of drawing high 120, impact damper 130, draws and fall circuit 140 and logical circuit 150.Operating in the explanation of front of driving circuit 110 each element narrated, and promptly repeated no more at this.In this embodiment, when LCD 200 is closed and when the operating voltage VDD that wins is descended, because of drawing high circuit 120 and drawing the dividing potential drop of falling circuit 140, can makes voltage XAO2 descend jointly.Therefore, in the present embodiment, driving circuit 110 is not being had under the situation of reset circuit 10, still can be through detecting whether voltage XAO2 be electronegative potential, judge whether LCD 200 just is being closed.When voltage XAO2 was electronegative potential, logical circuit 150 can make its sweep trace voltage V that exports GBe noble potential, to eliminate the ghost of LCD 200.
In sum; The driving circuit of the LCD in the above embodiment of the present invention can be when above-mentioned inner equivalent resistance becomes big; The sweep trace voltage that logical circuit is exported maintains high voltage for a long time; And make thin film transistor (TFT)s all on the liquid crystal panel after LCD cuts out, can keep the opening time more of a specified duration, and then use with in can prolong with time of the electric charge of pixel electrode, and the ghost of LCD can be eliminated fast and fully.
Though the present invention with embodiment openly as above; Right its is not that those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the appended claims person of defining.

Claims (10)

1. the driving circuit of a LCD comprises:
One draws high circuit, and this one first end that draws high circuit is coupled to one first operating voltage;
One impact damper, an input end of this impact damper are coupled to this one second end that draws high circuit;
One draws and falls circuit, and this draws one first end that falls circuit to be coupled to an output terminal of this impact damper, and this draws one second end that falls circuit to be coupled to one second operating voltage; And
One logical circuit; This output terminal that the input end of this logical circuit is coupled to this impact damper draws this first end that falls circuit with this; The output terminal of this logical circuit is coupled to a liquid crystal panel of this LCD, and when this logical circuit was electronegative potential in order to draw this first end that falls circuit at this, the one scan line voltage that this output terminal of this logical circuit is exported was noble potential; To eliminate the ghost of this liquid crystal panel
Wherein this draws and falls circuit and have to draw and fall resistance,
Wherein this draws high circuit and comprises:
One P-type mos field effect transistor, one of which grid couple this second operating voltage, and its one source pole couples this first operating voltage; And
One draws high resistance, and its first end couples a drain electrode of this P-type mos field effect transistor, and its second end couples an output terminal of a reset circuit and this input end of this impact damper.
2. driving circuit as claimed in claim 1; Wherein this one second end that draws high circuit is coupled to this output terminal of this reset circuit; This output terminal that one input end of this impact damper is coupled to this reset circuit draws high this second end of circuit with this; This reset circuit is suitable for exporting a reset signal, and wherein the voltage of this reset signal is noble potential when this LCD is opened, and after this LCD cuts out, is electronegative potential.
3. driving circuit as claimed in claim 2, wherein the resistance value of an inner equivalent resistance of reset circuit becomes big along with the decline of this first operating voltage.
4. driving circuit as claimed in claim 1, wherein this first operating voltage is higher than this second operating voltage.
5. driving circuit as claimed in claim 1, wherein this impact damper comprises the phase inverter of two serial connections.
6. LCD comprises:
One liquid crystal panel; And
One drive circuit is coupled to this liquid crystal panel, and this driving circuit comprises:
One draws high circuit, and this one first end that draws high circuit is coupled to one first operating voltage;
One impact damper, an input end of this impact damper are coupled to one second end that draws high circuit; And
One draws and falls circuit, and this draws one first end that falls circuit to be coupled to an output terminal of this impact damper, and this draws one second end that falls circuit to be coupled to one second operating voltage; And
One logical circuit; This output terminal that the input end of this logical circuit is coupled to this impact damper draws this first end that falls circuit with this; The output terminal of this logical circuit is coupled to this liquid crystal panel, and when this logical circuit was electronegative potential in order to draw this first end that falls circuit at this, the one scan line voltage that this output terminal of this logical circuit is exported was noble potential; To eliminate the ghost of this liquid crystal panel
Wherein this draws and falls circuit and draw by one and fall resistance and constitute,
Wherein this draws high circuit and comprises:
One P-type mos field effect transistor, one of which grid couple this second operating voltage, and its one source pole couples this first operating voltage; And
One draws high resistance, and its first end couples a drain electrode of this P-type mos field effect transistor, and its second end couples an output terminal of a reset circuit and this input end of this impact damper.
7. LCD as claimed in claim 6; Wherein this one second end that draws high circuit is coupled to this output terminal of this reset circuit; This output terminal that one input end of this impact damper is coupled to this reset circuit draws high this second end of circuit with this; This reset circuit is suitable for exporting a reset signal, and wherein the voltage of this reset signal is noble potential when this LCD is opened, and after this LCD cuts out, is electronegative potential.
8. LCD as claimed in claim 7, wherein the resistance value of an inner equivalent resistance of reset circuit becomes big along with the decline of this first operating voltage.
9. LCD as claimed in claim 6, wherein this first operating voltage is higher than this second operating voltage.
10. LCD as claimed in claim 6, wherein this impact damper comprises the phase inverter of two serial connections.
CN200910168704A 2009-09-03 2009-09-03 Liquid crystal displayer and driving circuit thereof Expired - Fee Related CN102005187B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104505050B (en) * 2014-12-31 2017-02-01 深圳市华星光电技术有限公司 Scanning driving circuit for oxide semiconductor thin film transistor
CN104778933B (en) * 2015-04-15 2017-04-19 昆山龙腾光电有限公司 power management circuit
CN110070816A (en) * 2019-04-04 2019-07-30 深圳市华星光电技术有限公司 Display panel, drive circuit

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