CN101599254A - The adjusting gear of output enable signal and method thereof - Google Patents
The adjusting gear of output enable signal and method thereof Download PDFInfo
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- CN101599254A CN101599254A CN 200910111651 CN200910111651A CN101599254A CN 101599254 A CN101599254 A CN 101599254A CN 200910111651 CN200910111651 CN 200910111651 CN 200910111651 A CN200910111651 A CN 200910111651A CN 101599254 A CN101599254 A CN 101599254A
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Abstract
The present invention relates to a kind of adjusting gear and method thereof of output enable signal.Method of adjustment comprises according to the responsibility cycle of output enable signal carries out filtering to the first scanning signal and the second scanning signal, and using provides the first output scanning signal and the second output scanning signal.If the second output scanning signal transferred the accurate position of activation to by accurate of forbidden energy before the first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, then increase the responsibility cycle of output enable signal.Can avoid taking place to write again problem thus.
Description
Technical field
The invention relates to a kind of adjustment technology of output enable signal, and particularly relevant for a kind of adjustment technology that is applicable to the output enable signal of gate pole driver.
Background technology
In recent years, LCD is because of having low voltage operating, advantage such as radiationless, and becomes the main flow of display product on the market.In general, LCD mainly comprises gate pole driver, source electrode driver and panel.What deserves to be mentioned is that known LCD but exists the problem that writes (Rewriting) again when driving, be described in detail as follows.
Fig. 1 is known a kind of synoptic diagram that writes phenomenon again.Please refer to Fig. 1, signal G1_output provides output scanning signal to article one sweep trace for gate pole driver, and wherein article one sweep trace couples the first row picture element transistor.Signal G2_output provides output scanning signal to the second sweep trace for gate pole driver, and wherein the second sweep trace couples secondary series picture element transistor.Signal S2_output provides to the transistorized data signals of secondary series picture element for source electrode driver.
Under perfect condition, the time that the voltage of signal G1_output and signal G2_output is reduced to electronegative potential by noble potential is 0 second, and similarly the time that rises to noble potential by electronegative potential also is 0 second, as shown in phantom in Figure 1.But in fact, the voltage waveform of signal G1_output and signal G2_output can not be perfect square wave, is reduced to electronegative potential and risen to noble potential by electronegative potential by noble potential all can produce delay, shown in solid line among Fig. 1.
Please continue with reference to Fig. 1, suppose that the transistorized forward voltage of picture element is Vth.When time T 1, the first row picture element transistor can transfer cut-off state to by conducting state.In addition, when time T 2, secondary series picture element transistor can transfer conducting state to by cut-off state.That is to say, in time T 1 during the time T 2, the first row picture element transistor AND gate secondary series picture element transistor conducting together.Therefore in time T 1 during the time T 2, signal S2_output can carry out write activity to the first row picture element transistor AND gate secondary series picture element transistor simultaneously, this is and writes phenomenon again.Ideally, signal S2_output only can write secondary series picture element transistor.
Summary of the invention
The adjusting gear that the purpose of this invention is to provide a kind of output enable signal can be avoided the situation that takes place to write again.
Another object of the present invention provides a kind of method of adjustment of output enable signal, and the responsibility cycle of output enable signal is adjusted on adaptability ground.
The present invention is achieved in that a kind of adjusting gear of output enable signal, comprises filtering circuit, first detecting unit, second detecting unit and adjustment unit.Filtering circuit can carry out filtering to the first scanning signal and the second scanning signal according to the responsibility cycle of output enable signal, using provides the first output scanning signal and the second output scanning signal, and wherein the scanning sequency of the second scanning signal is trailed the scanning sequency of the first scanning signal.First detecting unit couples filtering circuit, and whether the voltage that can detect the first output scanning signal uses output first detecting result, wherein predeterminated voltage indication picture element transistorized forward voltage less than predeterminated voltage.Second detecting unit couples first detecting unit, can before the voltage of the first scanning signal is less than forward voltage, whether receive indicating signal according to the first detecting result detecting, and export the second detecting result according to this, wherein the voltage of the indicating signal indication second scanning signal rises.Adjustment unit couples second detecting unit, can receive the second detecting result, if second detecting unit received indicating signal before the voltage of the first output scanning signal is less than forward voltage, then increases this responsibility cycle of output enable signal.
In one embodiment of this invention, first detecting unit can comprise differential amplifier.The positive input terminal of differential amplifier and negative input end receive the predeterminated voltage and the first output scanning signal respectively.The output terminal output first detecting result of differential amplifier.
In one embodiment of this invention, second detecting unit can comprise SR flip-flop, N channel transistor and P channel transistor.The setting termination of SR flip-flop is received indicating signal.The replacement end of SR flip-flop couples the output terminal of differential amplifier.The gate terminal of N channel transistor couples the output terminal of differential amplifier.First end of N channel transistor couples ground voltage.Second end of N channel transistor provides the second detecting result.The gate terminal of P channel transistor couples the output terminal of differential amplifier.First end of P channel transistor couples the output terminal of SR flip-flop.Second end of P channel transistor couples second end of N channel transistor.
In one embodiment of this invention, when second detecting unit does not receive indicating signal at the voltage of the first scanning signal before less than forward voltage, then keep the responsibility cycle of output enable signal.
From another angle, the present invention proposes a kind of method of adjustment of output enable signal, it comprises that according to the responsibility cycle of output enable signal the first scanning signal and second being scanned signal carries out filtering, using provides the first output scanning signal and the second output scanning signal, and wherein the scanning sequency of the second scanning signal is trailed the scanning sequency of the first scanning signal.In addition, detect the second output scanning signal and before the first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, whether transfer the accurate position of activation to by accurate of forbidden energy.In addition, if the second output scanning signal transferred the accurate position of activation to by accurate of forbidden energy before the first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, then increase the responsibility cycle of output enable signal.
Based on above-mentioned, the present invention carries out filtering according to the responsibility cycle of output enable signal to the first scanning signal and the second scanning signal, and using provides the first output scanning signal and the second output scanning signal.If the second output scanning signal transferred the accurate position of activation to by accurate of forbidden energy before the first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, then increase the responsibility cycle of output enable signal.Can avoid taking place to write again problem thus.
For above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Fig. 1 is known a kind of synoptic diagram that writes phenomenon again.
Fig. 2 is the synoptic diagram according to the adjusting gear of a kind of output enable signal of one embodiment of the invention.
Fig. 3 is the process flow diagram according to the method for adjustment of a kind of output enable signal of one embodiment of the invention.
Fig. 4 is a kind of synoptic diagram according to output enable signal filtering output scanning signal according to one embodiment of the invention.
Fig. 5 is the circuit diagram according to the detecting unit of a kind of adjusting gear of one embodiment of the invention.
Fig. 6 is a kind of synoptic diagram of adjusting output enable signal according to one embodiment of the invention.
Fig. 7 illustrates when the responsibility cycle wretched insufficiency of output enable signal, the oscillogram of each signal.
Fig. 8 illustrates when the responsibility cycle deficiency of output enable signal, the oscillogram of each signal.
Fig. 9 illustrates when the responsibility cycle of output enable signal is not enough a little, the oscillogram of each signal.
Figure 10 illustrates responsibility cycle when output enable signal when enough, the oscillogram of each signal.
[primary clustering symbol description]
10: filtering circuit
20,30: detecting unit
40: adjustment unit
50: gate pole driver
60: panel
S301～S303: each step of the method for adjustment of output enable signal
G1_output, G2_output, S2_output, QS, STV, S2_output: signal
T1, T2: time
Vth: voltage
ID, ID2: indicating signal
GL1～GLN: scanning signal
OGL1～OGLN: output scanning signal
OE: output enable signal
D: responsibility cycle
α, T, P1～P5: during
DR1, DR2: detecting result
Embodiment
Known LCD has the problem that writes again.In view of this, embodiments of the invention can carry out filtering to the first scanning signal and the second scanning signal according to the responsibility cycle (Duty Cycle) of output enable signal, and using provides the first output scanning signal and the second output scanning signal.Therefore can avoid the first output scanning signal and the second output scanning signal that the situation that overlaps takes place effectively.
In addition, what deserves to be mentioned is that for different LCD, the optimum value of the responsibility cycle of output enable signal might not be identical.So, can detect the second output scanning signal in an embodiment of the present invention and before the first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, whether transfer the accurate position of activation to by accurate of forbidden energy.If the second output scanning signal transferred the accurate position of activation to by accurate of forbidden energy before the first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, then increase the responsibility cycle of output enable signal.If the second output scanning signal did not transfer the accurate position of activation to from accurate of forbidden energy before the first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, then keep the responsibility cycle of output enable signal.Thus, the responsibility cycle of output enable signal is adjusted on adaptability ground.Elaborate embodiments of the invention below with reference to the accompanying drawings, accompanying drawing is for example understood example embodiment of the present invention, wherein same the or similar step of same numeral indication.
Fig. 2 is the synoptic diagram according to the adjusting gear of a kind of output enable signal of one embodiment of the invention.Please refer to Fig. 2, present embodiment is that example describes with the LCD.The adjusting gear of output enable signal is applicable to the gate pole driver 50 of LCD.More particularly, the part assembly of adjusting gear can combine with gate pole driver 50.Adjusting gear can comprise filtering circuit 10, detecting unit 20, detecting unit 30 and adjustment unit 40.
Fig. 3 is the process flow diagram according to the method for adjustment of a kind of output enable signal of one embodiment of the invention.Please merge with reference to Fig. 2 and Fig. 3, output enable signal OE that is provided by adjustment unit 40 and a plurality of scanning signals (representing it with GL1～GLN) that provided in regular turn by a plurality of offset buffers (not illustrating) can be provided filtering circuit 10.Then can be by step S301, filtering circuit 10 can carry out filtering to a plurality of scanning signals (representing it with GL1～GLN) according to the responsibility cycle D of output enable signal OE, uses picture element transistor (not illustrating) of a plurality of output scanning signals (representing it with OGL1～OGLN) that the tool succession is provided each row to the panel 60.Below illustrate in greater detail.
Table one: the truth table of filtering circuit 10.
| The scanning signal | Output enable signal | The output scanning signal |
| The accurate position of high voltage (1) | The accurate position of high voltage (1) | The accurate position of low-voltage (0) |
| The accurate position of high voltage (1) | The accurate position of low-voltage (0) | The accurate position of high voltage (1) |
| The accurate position of low-voltage (0) | The accurate position of high voltage (1) | The accurate position of low-voltage (0) |
| The accurate position of low-voltage (0) | The accurate position of low-voltage (0) | The accurate position of low-voltage (0) |
Fig. 4 is a kind of synoptic diagram according to output enable signal filtering output scanning signal according to one embodiment of the invention.Please merge with reference to table one and Fig. 2～Fig. 4, be that example describes with scanning signal GL1 and output scanning signal OGL1.When scanning signal GL1 is accurate position of high voltage and output enable signal OE when being the accurate position of high voltage, output scanning signal OGL1 then be accurate an of low-voltage.When scanning signal GL1 is accurate position of high voltage and output enable signal OE when being the accurate position of low-voltage, output scanning signal OGL1 then be accurate an of high voltage.When scanning signal GL1 is accurate position of low-voltage and output enable signal OE when being the accurate position of high voltage, output scanning signal OGL1 then be accurate an of low-voltage.When scanning signal GL1 is accurate position of low-voltage and output enable signal OE when being the accurate position of low-voltage, output scanning signal OGL1 then be accurate an of low-voltage.Scan signal GL2～GLN and output scanning signal OGL2～OGLN by that analogy, do not repeat them here.
Accept above-mentionedly, when output enable signal OE was the accurate position of high voltage, output scanning signal OGL1～OGLN was the accurate position of low-voltage.When output enable signal OE was the accurate position of low-voltage, the voltage quasi position of output scanning signal OGL1～OGLN was identical with scanning signal GL1～GLN respectively.That is to say that during two scanning signals were high-tension simultaneously, output enable signal OE can be set at the accurate position of high voltage, so can avoid two output scanning signals, use and improve the known problem that writes again simultaneously for the accurate position of high voltage.Have the knack of art technology person and should be known in that for different LCD, the optimum value of the responsibility cycle D of output enable signal OE might not be identical, wherein responsibility cycle D is α/T.Therefore can continue to adjust adaptively the responsibility cycle D of output enable signal OE by the following step S302～S304.
Then can be by step S302, whether detecting output scanning signal OGL2 transfers the accurate position of forbidden energy (the accurate position of low-voltage) at output scanning signal OGL1 to by the accurate position of activation (the accurate position of high voltage) and transfers the accurate position of activation to by the accurate position of forbidden energy before.The usefulness of this step is intended to judge whether LCD has the problem that writes again.Briefly, if it is the situation of the accurate position of high voltage simultaneously that output scanning signal OGL1 and output scanning signal OGL2 have, promptly represent LCD to have the problem that writes again, but subsequent steps S303 increase the responsibility cycle D of output enable signal OE to improve the problem that writes again; Otherwise the problem of then representing LCD not write again, but subsequent steps S304 keeps output enable signal OE.Below provide a kind of embodiment of step S302 to consider and examine for haveing the knack of art technology person.
Note that scanning signal GL1～GLN be in the accurate position of high voltage during must greater than output scanning signal OGL1～OGLN be in the accurate position of high voltage during.Do not having under the output enable signal OE situation, scanning signal GL1～GLN can be identical in fact with output scanning signal OGL1～OGLN.
In the present embodiment, can differentiate LCD according to the indicating signal ID2 that output scanning signal OGL1 and beacon scanning signal GL2 voltage rise whether the problem that writes is again arranged.The benefit of this practice is, when having, LCD writes problem again and execution in step S303, increase after the responsibility cycle D of output enable signal OE, the output scanning signal OGL1 of next picture be in the accurate position of high voltage during can shorten thereupon, but indicating signal ID2 can be not influenced.Variable Control under one situation, not only can be simplified the complexity of execution, also can reduce error.Below at " whether the indicating signal ID2 that rises according to output scanning signal OGL1 and beacon scanning signal GL2 voltage differentiates LCD the problem that writes again ", described in detail.
Fig. 5 is the circuit diagram according to the detecting unit of a kind of adjusting gear of one embodiment of the invention.Please merge with reference to Fig. 2, Fig. 3 and Fig. 5, in the present embodiment, detecting unit 20 is that example describes with differential amplifier 21.Detecting unit 30 is that example describes with SR flip-flop 31, N channel transistor 32 with P channel transistor 33.
Table two: the truth table of SR flip-flop 31.
| End R resets | Set end S | Output terminal Q |
| The accurate position of low-voltage (0) | The accurate position of low-voltage (0) | Keep laststate |
| The accurate position of low-voltage (0) | The accurate position of high voltage (1) | Be set at the accurate position of high voltage (1) |
| The accurate position of high voltage (1) | The accurate position of low-voltage (0) | Reset to the accurate position of low-voltage (0) |
| The accurate position of high voltage (1) | The accurate position of high voltage (1) | X |
Please continue to cooperate with reference to table two, SR flip-flop 31 has the end of replacement R, sets end S and output terminal Q.The replacement end R of SR flip-flop 31 can receive detecting DR1 as a result.The setting end S of SR flip-flop 31 can receive indicating signal ID2.In the present embodiment, indicating signal ID2 for example is the pulsewidth signal.SR flip-flop 31 can provide signal QS second end to transistor 33 from output terminal Q according to above-mentioned table two.
In the present embodiment, the effect of transistor 32,33 effects that had and filtering circuit 10 is similar.The gate of transistor 32,33 receives detecting DR1 as a result, can be according to whether detecting the conducting of DR1 decision as a result.That is to say that transistor 32,33 can be according to detecting DR1 and export ground voltage GND or signal QS as a result, use provide detecting as a result DR2 to adjustment unit 40.More particularly, when detecting when DR1 is the accurate position of high voltage as a result, the detecting voltage quasi position of DR2 as a result is identical with ground voltage GND.When detecting when DR1 is the accurate position of low-voltage as a result, the detecting voltage quasi position of DR2 as a result is identical with signal QS.Again from another angle, when detecting when DR2 is the accurate position of high voltage as a result, the problem of representing LCD to have to write again.Provide a kind of embodiment of step S303 and S304 to consider and examine then for haveing the knack of art technology person.
Fig. 6 is a kind of synoptic diagram of adjusting output enable signal according to one embodiment of the invention.Please cooperate with reference to Fig. 6, signal STV can distinguish during the different picture frames in Fig. 6.Adjustment unit 40 can according to the resulting detecting of step S302 as a result DR2 decide execution in step S303 or step S304.That is to say, adjustment unit 40 can according to detecting as a result the voltage quasi position of DR2 determine whether increasing or keeping the responsibility cycle D of output enable signal OE.For instance, during each picture frame in, the detecting that receives the accurate position of high voltage when adjustment unit 40 is DR2 as a result, but execution in step S303 increases a unit to the responsibility cycle D of output enable signal OE.Relatively, the detecting that receives the accurate position of low-voltage when adjustment unit 40 is DR2 as a result, but execution in step S304 keeps the responsibility cycle D of output enable signal OE.Thus, can adjust the responsibility cycle D of output enable signal OE adaptively.Below be further described at the various situations of LCD when operating again.
Fig. 7 illustrates when the responsibility cycle wretched insufficiency of output enable signal, the oscillogram of each signal.Please merge with reference to Fig. 2, Fig. 5, Fig. 7 and table three, when the responsibility cycle D of output enable signal OE wretched insufficiency, output scanning signal OGL1, OGL2 have the overlapping situation during the accurate position of high voltage.That is to say, the voltage of output scanning signal OGL1 is before decline, source electrode driver has begun output and has given the secondary series picture element transistorized signal S2_output, so signal S2_output can write the first row picture element transistor AND gate secondary series picture element transistor in the lump, forms and writes phenomenon again.In Fig. 7, indicating signal ID2 can produce according to indicating signal ID, and wherein indicating signal ID can rise in order to the voltage of beacon scanning signal.According to the content that the foregoing description disclosed, adjusting gear can be detected detecting that output scanning signal OGL1 and indicating signal ID2 produce the accurate position of high voltage according to this DR2 as a result.Then can use improvement and write phenomenon more again according to the responsibility cycle D of detecting DR2 increase as a result output enable signal OE.After the responsibility cycle D of output enable signal OE increases, the output scanning signal OGL1～OGLN of next picture be in the accurate position of high voltage during also can shorten thereupon.
Table three: the output state of SR flip-flop 31 during each among Fig. 7
| Period P 1 | Reset to the accurate position of low-voltage (0) |
| Period P 2 | Keep laststate |
| Period P 3 | Reset to the accurate position of high voltage (1) |
| Period P 4 | Keep laststate |
| Period P 5 | Reset to the accurate position of low-voltage (0) |
Fig. 8 illustrates when the responsibility cycle D of output enable signal deficiency, the oscillogram of each signal.Please merge with reference to Fig. 2, Fig. 5, Fig. 8 and table four.In Fig. 8, the voltage of output scanning signal OGL1 drops to before the predeterminated voltage Vth, source electrode driver has begun output and has given the secondary series picture element transistorized signal S2_output, therefore signal S2_output can write the first row picture element transistor AND gate secondary series picture element transistor in the lump, forms to write phenomenon again.What deserves to be mentioned is that adjusting gear 40 can be detected detecting that output scanning signal OGL1 and indicating signal ID2 produce the accurate position of high voltage according to this DR2 as a result.Then can use improvement and write phenomenon more again according to the responsibility cycle D of detecting DR2 increase as a result output enable signal OE.After the responsibility cycle D of output enable signal OE increases, the output scanning signal OGL1～OGLN of next picture be in the accurate position of high voltage during also can shorten thereupon.
Table four: the output state of SR flip-flop 31 during each among Fig. 8
| Period P 1 | Reset to the accurate position of low-voltage (0) |
| Period P 2 | Keep laststate |
| Period P 3 | Reset to the accurate position of low-voltage (0) |
| Period P 4 | X |
| Period P 5 | Reset to the accurate position of low-voltage (0) |
Fig. 9 illustrates when the responsibility cycle of output enable signal is not enough a little, the oscillogram of each signal.Please merge with reference to Fig. 2, Fig. 5, Fig. 9 and table five.In Fig. 9, the situation (being in critical conditions) though output scanning signal OGL1, OGL2 have not overlapped during the accurate position of high voltage.But in the present embodiment, adjusting gear 40 is detecting DR2 as a result that detecting output scanning signal OGL1 and indicating signal ID2 produce the accurate position of high voltage according to this.Therefore under this critical conditions, adjusting gear 40 can assert still that LCD has and write phenomenon again, and the detecting that produces the accurate position of high voltage DR2 as a result, and increases the responsibility cycle D of output enable signal OE according to this.The benefit of this practice is, can eliminate definitely and write phenomenon.After the responsibility cycle D of output enable signal OE increases, the output scanning signal OGL1～OGLN of next picture be in the accurate position of high voltage during also can shorten again thereupon.
Table five: the output state of SR flip-flop 31 during each among Fig. 9
| Period P 1 | Reset to the accurate position of low-voltage (0) |
| Period P 2 | Keep laststate |
| Period P 3 | Reset to the accurate position of high voltage (1) |
| Period P 4 | X |
| Period P 5 | Reset to the accurate position of low-voltage (0) |
Figure 10 illustrates responsibility cycle when output enable signal when enough, the oscillogram of each signal.Please merge with reference to Fig. 2, Fig. 5, Figure 10 and table six.In Figure 10, the situation though output scanning signal OGL1, OGL2 have not overlapped during the accurate position of high voltage, and at a distance of length.Therefore the adjusting gear 40 detecting DR2 as a result that can produce the accurate position of low-voltages, and keep the responsibility cycle D of output enable signal OE according to this.The good image quality that not only can possess LCD thus also can be eliminated effectively and write phenomenon again.
Table six: the output state of SR flip-flop 31 during each among Figure 10
| Period P 1 | Reset to the accurate position of low-voltage (0) |
| Period P 2 | Keep laststate |
| Period P 3 | Reset to the accurate position of low-voltage (0) |
| Period P 4 | X |
| Period P 5 | Reset to the accurate position of low-voltage (0) |
What deserves to be mentioned is, though in the foregoing description adjusting gear and the method thereof to output enable signal depicted a possible kenel, usually know that the knowledgeable should know but have in the affiliated technical field, each manufacturer is all different for the design of the adjusting gear of output enable signal and method thereof, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as differentiate LCD whether the problem that writes is again arranged, using the responsibility cycle D that determines increase or keep output enable signal has been to have met spiritual place of the present invention just.Below know that the knowledgeable can further understand spirit of the present invention for several embodiment usually so that this area has again, and implement the present invention.
The foregoing description is to differentiate LCD according to the indicating signal ID2 that output scanning signal OGL1 and beacon scanning signal GL2 voltage rise whether the problem that writes is again arranged.But the present invention is not as limit.In other embodiments, also can differentiate LCD whether the problem that writes is again arranged according to output scanning signal OGL1 and output scanning signal OGL2.The benefit of this practice is, as long as output scanning signal OGL1 and output scanning signal OGL2 do not overlap 40 responsibility cycle D that can not increase output enable signal OE of adjusting gear during the accurate position of high voltage.
In addition, among the step S303 of the foregoing description, adjustment unit 40 is the responsibility cycle D that output enable signal OE increased a unit, but it only is a kind of selection embodiment.In other embodiments, adjustment unit 40 also can be according to detecting the pulsewidth size of DR2 as a result, the corresponding responsibility cycle D that adjusts output enable signal OE.The benefit of this practice is to obtain apace the responsibility cycle D of suitable output enable signal OE.
In sum, whether the present invention differentiates LCD has and writes phenomenon again, uses the responsibility cycle that decision increases or keep output enable signal.Therefore not only can improve writing phenomenon again, go back the responsibility cycle that output enable signal is adjusted on adaptability ground.All embodiment of the present invention in addition also have following effect:
1. whether the indicating signal ID2 that rises according to output scanning signal OGL1 and beacon scanning signal GL2 voltage differentiates LCD the problem that writes again.Can eliminate definitely and write phenomenon.
2. differentiate LCD according to output scanning signal OGL1 and output scanning signal OGL2 whether the problem that writes is again arranged.The benefit of this practice is that as long as output scanning signal OGL1 and output scanning signal OGL2 do not overlap, adjusting gear then can not increase the responsibility cycle of output enable signal OE during the accurate position of high voltage.
3. according to detecting the pulsewidth size of DR2 as a result, the corresponding responsibility cycle of adjusting output enable signal OE.Can obtain the responsibility cycle of suitable output enable signal OE apace.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention, to have in any affiliated technical field and know the knowledgeable usually, without departing from the spirit and scope of the present invention; when doing a little change and retouching, so protection scope of the present invention is as the criterion when looking the claim person of defining.
Claims (6)
1. the adjusting gear of an output enable signal is characterized in that, comprising:
One filtering circuit, responsibility cycle according to this output enable signal is carried out filtering to one first scanning signal and one second scanning signal, using provides one first output scanning signal and one second output scanning signal, and wherein the scanning sequency of this second scanning signal is trailed the scanning sequency of this first scanning signal;
One first detecting unit couples this filtering circuit, and whether the voltage of detecting this first output scanning signal uses output one first detecting result less than a predeterminated voltage, and wherein this predeterminated voltage is indicated the transistorized forward voltage of a picture element;
One second detecting unit, couple this first detecting unit, before the voltage of this first output scanning signal is less than this forward voltage, whether receive an indicating signal according to this first detecting result detecting, and export one second detecting result according to this, wherein this indicating signal indicates the voltage of this second scanning signal to rise; And
One adjustment unit, couple this second detecting unit, receive this second detecting result,, then increase this responsibility cycle of this output enable signal if this second detecting unit received this indicating signal before the voltage of this first output scanning signal is less than this forward voltage.
2. the adjusting gear of output enable signal according to claim 1 is characterized in that, wherein this first detecting unit comprises:
One differential amplifier, its positive input terminal and negative input end receive this predeterminated voltage and this first output scanning signal respectively, and the output terminal of this differential amplifier is exported this first detecting result.
3. the adjusting gear of output enable signal according to claim 2 is characterized in that, wherein this second detecting unit comprises:
One SR flip-flop, it is set termination and receives this indicating signal, and the replacement end of this SR flip-flop couples the output terminal of this differential amplifier;
One N channel transistor, its gate terminal couples the output terminal of this differential amplifier, and first end of this N channel transistor couples a ground voltage, and second end of this N channel transistor provides this second detecting result; And
One P channel transistor, its gate terminal couples the output terminal of this differential amplifier, and first end of this P channel transistor couples the output terminal of this SR flip-flop, and second end of this P channel transistor couples second end of this N channel transistor.
4. the adjusting gear of output enable signal according to claim 1, it is characterized in that, wherein do not receive this indicating signal at the voltage of this first scanning signal before less than this forward voltage when this second detecting unit, then keep this responsibility cycle of this output enable signal.
5. the method for adjustment of an output enable signal is characterized in that, comprising:
Responsibility cycle according to this output enable signal is carried out filtering to one first scanning signal and one second scanning signal, using provides one first output scanning signal and one second output scanning signal, and wherein the scanning sequency of this second scanning signal is trailed the scanning sequency of this first scanning signal;
Detect this second output scanning signal and before this first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, whether transfer the accurate position of activation to by accurate of forbidden energy; And
If this second output scanning signal transferred the accurate position of activation to by accurate of forbidden energy before this first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, then increase this responsibility cycle of this output enable signal.
6. the method for adjustment of output enable signal according to claim 5 is characterized in that, more comprises:
If this second output scanning signal did not transfer the accurate position of activation to from accurate of forbidden energy before this first output scanning signal transfers the accurate position of forbidden energy to by activation standard position, then keep this responsibility cycle of this output enable signal.
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| CN103050102A (en) * | 2012-12-10 | 2013-04-17 | 华映视讯（吴江）有限公司 | Device and method for reducing ghost images displayed on liquid crystal display panel |
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| JP3277382B2 (en) * | 1992-01-31 | 2002-04-22 | ソニー株式会社 | Horizontal scanning circuit with fixed overlapping pattern removal function |
| KR100186547B1 (en) * | 1996-03-26 | 1999-04-15 | 구자홍 | Gate driving circuit of liquid crystal display element |
| CN1873756A (en) * | 2005-06-01 | 2006-12-06 | 中华映管股份有限公司 | Sequential control circuit and method |
| KR20080004986A (en) * | 2006-07-07 | 2008-01-10 | 삼성전자주식회사 | Driving apparatus and liquid crystal display including the same and driving method thereof |
| CN101127199B (en) * | 2007-09-06 | 2010-06-02 | 友达光电股份有限公司 | Gate driver for outputting superposition-free scanning signal, liquid crystal display and method |
-
2009
- 2009-05-05 CN CN 200910111651 patent/CN101599254B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103050102A (en) * | 2012-12-10 | 2013-04-17 | 华映视讯（吴江）有限公司 | Device and method for reducing ghost images displayed on liquid crystal display panel |
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| CN101599254B (en) | 2012-12-19 |
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