CN105118468A - Signal generation circuit for liquid crystal residual image elimination - Google Patents
Signal generation circuit for liquid crystal residual image elimination Download PDFInfo
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- CN105118468A CN105118468A CN201510623017.7A CN201510623017A CN105118468A CN 105118468 A CN105118468 A CN 105118468A CN 201510623017 A CN201510623017 A CN 201510623017A CN 105118468 A CN105118468 A CN 105118468A
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Abstract
The invention provides a signal generation circuit for liquid crystal residual image elimination. The signal generation circuit is characterized by an oscillation circuit, a following circuit, and a triangular wave generation circuit, the input end of the oscillation circuit receives external pulse signals, the output end of the oscillation circuit is electrically connected with the input end of the following circuit to send the oscillation signals generated by the oscillation circuit to the following circuit, the input end of the following circuit receives the oscillation signals and the output end of the following circuit is electrically connected with the input end of the triangular wave generation circuit, the oscillation signals are subjected to buffer isolation and are sent to the triangular wave generation circuit, the input end of the triangular wave generation circuit receives the oscillation signals after being subjected to buffer isolation, and after the oscillation signals are converted into triangular wave signals, the triangular wave signals are output through the triangular wave generation circuit. The circuit generates the triangular wave signals synchronized with original direct current pulse signals and loads the triangular wave signals to a shielding layer to enable a panel to generate a periodical electric field, so that the effect of a driving electric field on positive and negative ions is suppressed, the probability of the absorption of the positive and negative ions to a display electrode and a common electrode is reduced, and the liquid crystal residual images can be eliminated.
Description
Technical field
The present invention relates to technical field of liquid crystal display, specifically, relating to a kind of signal generating circuit for eliminating liquid crystal image retention.
Background technology
Along with the development of lcd technology, display panels application is also more and more extensive.But after display panels keeps a static picture for a long time on screen, liquid crystal in display panels is polarized owing to being driven for a long time, cause liquid crystal molecule normally can not deflect under signal voltage controls, even if display panels changes the content of display frame, before screen still can exist, the vestige of image, is called image retention.
Image retention producing cause is the stray capacitance between display panels, and the ion characteristic of liquid crystal material itself.In prior art, by utilizing the reference voltage V of liquid crystal deflecting element
comreference voltage function, regulate V
comsize eliminates the difference of positive-negative polarity pixel voltage, and then plays the effect suppressing stray capacitance to eliminate image retention; And the image retention caused by liquid crystal material itself is mainly because negative ions contained by liquid crystal material, these negative ions can be adsorbed on show electrode and public electrode under driving electric field action, form inner DC electric field, cause image retention, in prior art, this defect cannot be solved.
Summary of the invention
For above deficiency, the present invention proposes a kind of signal generating circuit for eliminating liquid crystal image retention, solve in the display panels of prior art, because negative ions in liquid crystal material is adsorbed on show electrode and public electrode, and then the problem of the image retention produced.
For eliminating a signal generating circuit for liquid crystal image retention, comprise oscillatory circuit, follow circuit and circuit for generating triangular wave;
Wherein, the input end of described oscillatory circuit receives external pulse signal, and output terminal is electrically connected with the input end of described follow circuit, and the oscillator signal for being produced by oscillatory circuit is sent to described follow circuit;
The input end of described follow circuit receives described oscillator signal, and output terminal is electrically connected with the input end of described circuit for generating triangular wave, for described oscillator signal is carried out buffer compartment from and be sent to circuit for generating triangular wave;
The input end of described circuit for generating triangular wave receive buffer compartment from after oscillator signal, exported by described circuit for generating triangular wave after being converted into triangular signal.
Further, described oscillatory circuit comprises: the first Sheffer stroke gate, the first not gate, the first resistance, the second resistance, the first diode, the second diode and the first electric capacity;
Wherein, the first input end of described first Sheffer stroke gate receives external pulse signal, and the second input end is electrically connected with the source electrode of the negative pole of described first diode, the positive pole of the second diode, the first end of the first electric capacity and the first field effect transistor respectively; Output terminal is electrically connected with the input end of the first end of described first resistance, the first end of the second resistance and the first not gate respectively;
Second end of described first resistance is electrically connected with the positive pole of described first diode;
Second end of described second resistance is connected with the negative electricity of described second diode;
The output terminal of described first not gate is electrically connected with the second end of the first described electric capacity and the input end of described follow circuit, for transmitting described oscillator signal.
Further, described first diode and described second diode are schottky diode.
Further, also include the first field effect transistor, the grid of wherein said first field effect transistor is electrically connected with the first input end of described first Sheffer stroke gate, and the negative pole of source electrode and described first diode, the positive pole of the second diode, the first end of the first electric capacity are electrically connected, drain be electrically connected.
Further, described follow circuit comprises: the second electric capacity, the first variable resistor, the first power supply, second source and the first operational amplifier;
Wherein, the first end of described second electric capacity receives the oscillator signal of the output terminal transmission of described oscillatory circuit, and the second end is electrically connected with the in-phase input end of described first variable-resistance first end and described first operational amplifier;
Described first variable-resistance second end is electrically connected with the positive pole of described first power supply and the first voltage controling end of described first operational amplifier respectively; Described first variable-resistance 3rd end is electrically connected with the negative pole of described second source and the second voltage controling end of described first operational amplifier respectively;
The negative pole of described first power supply be electrically connected, the positive pole of described second source be electrically connected;
The reverse input end of described first operational amplifier is electrically connected with the output terminal of the first operational amplifier, and is electrically connected with the input end of described circuit for generating triangular wave, for the oscillator signal after transmit buffering isolation.
Further, described first power supply provides forward dc power supply, and described second source provides negative sense direct supply.
Further, described circuit for generating triangular wave comprises: the 3rd resistance and the 3rd electric capacity;
Wherein, the buffer compartment that the output terminal that the first end of described 3rd resistance receives described follow circuit sends from after oscillator signal, the second end is electrically connected with the first end of described 3rd electric capacity;
Second end of described 3rd electric capacity be electrically connected;
Second end of described 3rd resistance is described signal generating circuit output terminal, exports for the triangular signal produced described circuit for generating triangular wave.
Further, described circuit for generating triangular wave is electrically connected with the screen layer on color membrane substrates.
Further, described first field effect transistor is P-channel enhancement type field effect transistor.
The embodiment of the present invention provides a kind of signal generating circuit for eliminating liquid crystal image retention, and by Signal transmissions to the screen layer of color membrane substrates, LCD intralamellar part is made to produce periodically electric field, thus inhibit driving electric field to the effect of negative ions, reduce the probability that negative ions is adsorbed on show electrode and public electrode, thus reach the effect eliminating liquid crystal image retention.
Accompanying drawing explanation
Fig. 1 is a kind of signal generating circuit structural representation for eliminating liquid crystal image retention that the embodiment of the present invention one provides.
Fig. 2 is a kind of signal generating circuit structural representation for eliminating liquid crystal image retention that the embodiment of the present invention two provides.
Fig. 3 is a kind of signal generating circuit intermediate cam wave generation circuit schematic diagram for eliminating liquid crystal image retention that the embodiment of the present invention two provides.
Fig. 4 is a kind of signal generating circuit output waveform schematic diagram for eliminating liquid crystal image retention that the embodiment of the present invention two provides.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not full content.
Embodiment one
Fig. 1 is a kind of signal generating circuit structural representation for eliminating liquid crystal image retention that the embodiment of the present invention one provides.As shown in Figure 1, a kind of signal generating circuit for eliminating liquid crystal image retention, is characterized in that, comprises oscillatory circuit 100, follow circuit 200 and circuit for generating triangular wave 300;
Wherein, the input end of oscillatory circuit 100 receives external pulse signal, and output terminal is electrically connected with the input end of follow circuit 200, and the oscillator signal for being produced by oscillatory circuit 100 is sent to follow circuit 200;
The input end of follow circuit 200 receives oscillator signal, and output terminal is electrically connected with the input end of circuit for generating triangular wave 300, for oscillator signal is carried out buffer compartment from and be sent to circuit for generating triangular wave 300;
The input end of circuit for generating triangular wave 300 receive buffer compartment from after oscillator signal, exported by circuit for generating triangular wave 300 after being converted into triangular signal.
It should be noted that embodiment illustrated in fig. 1 in signal generating circuit can comprise pulse signal generator 400.Pulse signal generator 400 is for generation of external pulse signal and be sent to oscillatory circuit 100.
Oscillatory circuit 100 receives this external pulse signal, for this external pulse signal is converted into periodically variable oscillator signal.The cycle of this oscillator signal is selected relevant with the device parameters of oscillatory circuit 100 inside.
Follow circuit 200 receives this periodically variable oscillator signal.The inner member of follow circuit 200 is utilized to form a voltage follower, this voltage follower can carry out isolation buffer to periodically variable oscillator signal, input impedance due to voltage follower outside is high-impedance state, and output impedance is low resistance state, voltage follower is adopted to play buffer action.
In the embodiment of the present invention, circuit for generating triangular wave 300 wherein can adopt RC integrating circuit, by changing the time constant of this RC integrating circuit, thus the periodically variable oscillator signal of input is converted into triangular signal.
A kind of signal generating circuit for eliminating liquid crystal image retention that the embodiment of the present invention provides, by former external pulse signal is converted into triangular signal, and be loaded on the screen layer of color membrane substrates, LCD intralamellar part is made to produce periodically electric field, thus inhibit driving electric field to the effect of negative ions, reduce the probability that negative ions is adsorbed on show electrode and public electrode, thus eliminate liquid crystal image retention.
Embodiment two
Fig. 2 is a kind of signal generating circuit structural representation for eliminating liquid crystal image retention that the embodiment of the present invention two provides.As shown in Figure 2, this signal generating circuit comprises oscillatory circuit 100, follow circuit 200, circuit for generating triangular wave 300 and the first field effect transistor 500.
Wherein, oscillatory circuit 100 comprises: the first Sheffer stroke gate 101, first not gate 102, first resistance 103, second resistance 104, first diode 105, second diode 106 and the first electric capacity 107;
Wherein, the first input end of the first Sheffer stroke gate 101 receives external pulse signal, and the second input end is electrically connected with the source electrode of the negative pole of the first diode 105, the positive pole of the second diode 106, the first end of the first electric capacity 107 and the first field effect transistor 500 respectively; Output terminal is electrically connected with the input end of the first end of the first resistance 103, the first end of the second resistance 104 and the first not gate 102 respectively;
Second end of the first resistance 103 is electrically connected with the positive pole of the first diode 105;
Second end of the second resistance 104 is connected with the negative electricity of the second diode 106;
The output terminal of the first not gate 102 with the second end of the first electric capacity 107 and the input end of follow circuit 200 be electrically connected, for transmitting oscillator signal.
First diode 105 and the second diode 106 are schottky diode.
The grid of the first field effect transistor 500 is electrically connected with the first input end of the first Sheffer stroke gate 101, and the negative pole of source electrode and described first diode 105, the positive pole of the second diode 106, the first end of the first electric capacity 107 are electrically connected, drain be electrically connected.
It should be noted that, the external pulse signal being loaded into the first input end of the first Sheffer stroke gate 101 is DC pulse signal.And the first diode 105 and the second diode 106 adopt schottky diode can obtain threshold voltage less compared with general-purpose diode, thus make the reaction of oscillatory circuit 100 more sensitive.
When oscillatory circuit 100 is in original operating state, the first end of the first electric capacity 107 is in low level.And then no matter which kind of state DC pulse signal is input as, this low level signal will be converted into high level signal by after the first Sheffer stroke gate 101;
The first end being loaded into the first electric capacity 107 by the first resistance 103 and the first diode 106 of high level signal.In addition, this high level signal also by exporting after the first not gate 102 as low level signal, and is loaded into the second end of the first electric capacity 107, and the oscillator signal that namely now oscillatory circuit 100 exports is low level.
When the magnitude of voltage of the first end of the first electric capacity 107 reaches the input threshold value high level of the first Sheffer stroke gate 101, the output terminal of the first Sheffer stroke gate 101 will be converted into low level, low level signal is loaded into the first end of the first electric capacity 107 by the second resistance 104 and the second diode 106, and this low level signal is by exporting as high level after the first not gate 102, the oscillator signal that namely now oscillatory circuit 100 exports is high level.Therefore, oscillatory circuit 100 produces the oscillator signal at low and high level interval.
In the middle of the process of vibration, by adopting the structure of the first resistance 103, first diode 105 and the second resistance 104 and the second diode 106, the output signal of first and non-101 is loaded into the first end of the first electric capacity 107; By the equilibrium state adopting this type of connected mode can control the first electric capacity 107 two ends level conversion.Namely be loaded into the magnitude of voltage at the first electric capacity 107 two ends by the parameter of change first resistance 103, first diode 105, second resistance 104 and the second diode 106 and then change and then change the discharge and recharge time, thus change the duration of low and high level, realize the oscillation frequency and the phase place that change oscillator signal.
It is worth mentioning that, the first field effect transistor 500 can be P-channel enhancement type field effect transistor.And the turn-on condition of this field effect transistor is source voltage is greater than grid voltage.And then when oscillatory circuit 100 end-of-job, when DC pulse signal is low level, if now the first end of the first electric capacity 107 is high level, then the first field effect transistor 500 is in conducting state and makes oscillatory circuit return to original state.
Further, follow circuit 200 comprises: the second electric capacity 201, first variable resistor 202, first power supply 203, second source 204 and the first operational amplifier 205;
Wherein, the first end of the second electric capacity 201 receives the oscillator signal of the output terminal transmission of oscillatory circuit 100, and the second end is electrically connected with the first end of the first variable resistor 202 and the in-phase input end of the first operational amplifier 205;
Second end of the first variable resistor 202 is electrically connected with the positive pole of the first power supply 203 and the first voltage controling end of the first operational amplifier 205 respectively; 3rd end of the first variable resistor 202 is electrically connected with the negative pole of second source 204 and the second voltage controling end of the first operational amplifier 205 respectively;
It should be noted that the first end of the first variable resistor 202 is the sliding contact point of the first variable resistor 202, the second end and the 3rd end are respectively maximum effective value terminal.
The negative pole of the first power supply 203 be electrically connected, the positive pole of second source 204 be electrically connected;
The reverse input end of the first operational amplifier 205 is electrically connected with the output terminal of the first operational amplifier 205, and is electrically connected with the input end of circuit for generating triangular wave 300, for the oscillator signal after transmit buffering isolation.
First power supply 203 provides forward dc power supply, and second source 204 provides negative sense direct supply.Wherein, the DC voltage voltage that the first power supply 203 provides is the maximum voltage that display panels show electrode loads, and the direct current power source voltage that second source 204 provides is the minimum voltage that display panels show electrode loads.
Concrete, the oscillator signal that in the present embodiment, oscillatory circuit 100 sends is square wave oscillation signal.
When square wave oscillation signal is linked into follow circuit 200 by the second electric capacity 201, first can filter the DC component of adulterating in square wave oscillation signal by the second electric capacity 201, and then input to the in-phase input end of the first operational amplifier 205 by the first variable resistor 202.
It is worth mentioning that, the first end of the first variable resistor 202 is electrically connected with the second end of the second electric capacity 201, second end is connected with the positive pole of the first power supply 203, the negative electricity of second source 204 respectively with the 3rd end, accesses resistance in follow circuit 200 in order to adjust the first variable resistor 202.
The reverse input end of the first operational amplifier 205 is electrically connected with output terminal, in order to form a voltage follower.Voltage follower refers to that output voltage is identical with input voltage, and therefore the voltage amplification factor of voltage follower is less than 1 or close to 1.
Voltage follower mainly plays buffering, isolation, improves load capacity.Because the first operational amplifier 205 input impedance is the first variable resistor 202 and for high-impedance state, output impedance is resistance in circuit for generating triangular wave 300 and is low resistive state, therefore can be played the effect of circuit before and after isolation by the first operational amplifier 205.Square wave oscillation signal joins the in-phase input end of the first operational amplifier 205, through buffer compartment from afterwards, exports circuit for generating triangular wave to.
It is worth mentioning that, the first operational amplifier 205 includes the first voltage controling end and the second voltage controling end.When the first voltage controling end loads positive voltage, when the second voltage controling end loads negative voltage, the first operational amplifier can use.
Further, circuit for generating triangular wave 300 comprises: the 3rd resistance 301 and the 3rd electric capacity 302;
Wherein, the buffer compartment that the output terminal that the first end of the 3rd resistance 301 receives follow circuit 200 sends from after oscillator signal, the second end is electrically connected with the first end of the 3rd electric capacity 302;
Second end of the 3rd electric capacity 302 be electrically connected;
Second end of the 3rd resistance 301 is signal generating circuit output terminal, exports for the triangular signal produced circuit for generating triangular wave 300.
When the RC circuit that the square wave oscillation signal after isolating consists of the 3rd resistance 301 and the 3rd electric capacity 302, triangular signal can be transformed into.
Fig. 3 is a kind of signal generating circuit intermediate cam wave generation circuit schematic diagram for eliminating liquid crystal image retention that the embodiment of the present invention two provides.
As shown in Figure 3, the conversion process of circuit for generating triangular wave 300 pairs of signals is as follows:
If the magnitude of voltage of the square wave oscillation signal after isolation is V
i, the output voltage values of circuit for generating triangular wave 300 is V
o.
Then have:.Wherein R is the resistance value of the 3rd resistance 301, i
cfor the current value of circuit, V
oalso be the magnitude of voltage at the 3rd electric capacity 302 two ends simultaneously.By
can obtain:
Can obtain through calculating
Can be obtained by above-mentioned formula, output voltage values V
owith the relating to parameters of the 3rd resistance 301 and the 3rd electric capacity 302, and change in time.
Fig. 4 is a kind of signal generating circuit output waveform schematic diagram for eliminating liquid crystal image retention that the embodiment of the present invention two provides.
As shown in Figure 4, S1 is DC pulse signal, and S2 is triangular signal.As can be seen from Figure 4, DC pulse signal can produce a downward pulse signal within the identical time interval, therefore can regard DC pulse signal as periodic pulse signal.Circuit for generating triangular wave produces the output voltage values V of 300
ooscillogram be nonstandard triangular signal.Further, the triangular signal of output and DC pulse signal are synchronizing signal, and when DC pulse signal produces downward pulse, triangular signal is all in the latter end of this signal period.
In addition, circuit for generating triangular wave 300 is electrically connected with the screen layer on color membrane substrates.The triangular signal that circuit for generating triangular wave 300 exports is loaded into the screen layer on color membrane substrates, and can produce corresponding periodically electric field at LCD intralamellar part, this is the cycle of electric field and the cycle synchronisation of triangular signal periodically.
The embodiment of the present invention is by providing a kind of signal generating circuit for eliminating liquid crystal image retention, make it to produce the triangular signal synchronous with former DC pulse signal, and the screen layer be loaded on color membrane substrates, screen layer is made to produce corresponding periodicity electric field at panel itself, reduce the probability that negative ions is adsorbed on show electrode and public electrode,, thus realize the function eliminating liquid crystal image retention.
It should be noted that; the above is only the preferred embodiment of the present invention, it should be pointed out that for those skilled in the art; the equivalent variations made under the prerequisite of the design and principle that do not depart from the principle of the invention, amendment and combination, all should belong to protection scope of the present invention.
Claims (9)
1. for eliminating a signal generating circuit for liquid crystal image retention, it is characterized in that, comprising oscillatory circuit, follow circuit and circuit for generating triangular wave;
Wherein, the input end of described oscillatory circuit receives external pulse signal, and output terminal is electrically connected with the input end of described follow circuit, and the oscillator signal for being produced by oscillatory circuit is sent to described follow circuit;
The input end of described follow circuit receives described oscillator signal, and output terminal is electrically connected with the input end of described circuit for generating triangular wave, for described oscillator signal is carried out buffer compartment from, and be sent to described circuit for generating triangular wave;
The input end of described circuit for generating triangular wave receive buffer compartment from after described oscillator signal, export after being converted into triangular signal.
2. the signal generating circuit for eliminating liquid crystal image retention according to claim 1, is characterized in that, described oscillatory circuit comprises: the first Sheffer stroke gate, the first not gate, the first resistance, the second resistance, the first diode, the second diode and the first electric capacity;
Wherein, the first input end of described first Sheffer stroke gate receives external pulse signal, and the second input end is electrically connected with the source electrode of the negative pole of described first diode, the positive pole of the second diode, the first end of the first electric capacity and the first field effect transistor respectively; Output terminal is electrically connected with the input end of the first end of described first resistance, the first end of the second resistance and the first not gate respectively;
Second end of described first resistance is electrically connected with the positive pole of described first diode;
Second end of described second resistance is connected with the negative electricity of described second diode;
The output terminal of described first not gate is electrically connected with the second end of the first described electric capacity and the input end of described follow circuit, for transmitting described oscillator signal.
3. the signal generating circuit for eliminating liquid crystal image retention according to claim 2, is characterized in that, described first diode and described second diode are schottky diode.
4. the signal generating circuit for eliminating liquid crystal image retention according to claim 2, it is characterized in that, also include the first field effect transistor, the grid of wherein said first field effect transistor is electrically connected with the first input end of described first Sheffer stroke gate, the negative pole of source electrode and described first diode, the positive pole of the second diode, the first end of the first electric capacity are electrically connected, drain be electrically connected.
5. the signal generating circuit for eliminating liquid crystal image retention according to claim 1, is characterized in that, described follow circuit comprises: the second electric capacity, the first variable resistor, the first power supply, second source and the first operational amplifier;
Wherein, the first end of described second electric capacity receives the oscillator signal of the output terminal transmission of described oscillatory circuit, and the second end is electrically connected with the in-phase input end of described first variable-resistance first end and described first operational amplifier;
Described first variable-resistance second end is electrically connected with the positive pole of described first power supply and the first voltage controling end of described first operational amplifier respectively; Described first variable-resistance 3rd end is electrically connected with the negative pole of described second source and the second voltage controling end of described first operational amplifier respectively;
The negative pole of described first power supply be electrically connected, the positive pole of described second source be electrically connected;
The reverse input end of described first operational amplifier is electrically connected with the output terminal of the first operational amplifier, and is electrically connected with the input end of described circuit for generating triangular wave, for the oscillator signal after transmit buffering isolation.
6. the signal generating circuit for eliminating liquid crystal image retention according to claim 5, is characterized in that, described first power supply provides forward dc power supply, and described second source provides negative sense direct supply.
7. the signal generating circuit for eliminating liquid crystal image retention according to claim 1, is characterized in that, described circuit for generating triangular wave comprises: the 3rd resistance and the 3rd electric capacity;
Wherein, the buffer compartment that the output terminal that the first end of described 3rd resistance receives described follow circuit sends from after oscillator signal, the second end is electrically connected with the first end of described 3rd electric capacity;
Second end of described 3rd electric capacity be electrically connected;
Second end of described 3rd resistance is described signal generating circuit output terminal, exports for the triangular signal produced described circuit for generating triangular wave.
8. the signal generating circuit for eliminating liquid crystal image retention according to claim 7, is characterized in that, described circuit for generating triangular wave is electrically connected with the screen layer on color membrane substrates.
9. the signal generating circuit for eliminating liquid crystal image retention according to claim 1, is characterized in that, described first field effect transistor is P-channel enhancement type field effect transistor.
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| WO2019136783A1 (en) * | 2018-01-15 | 2019-07-18 | 深圳市华星光电技术有限公司 | Amplification circuit used for liquid crystal display and liquid crystal display |
| US10514562B2 (en) | 2018-01-15 | 2019-12-24 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Amplifier for LCD and LCD |
| US11263938B1 (en) | 2020-09-03 | 2022-03-01 | Shanghai Tianma Micro-electronics Co., Ltd. | Light-emitting panel and display device |
| CN115356539A (en) * | 2022-08-12 | 2022-11-18 | 北京津发科技股份有限公司 | EEG impedance test circuit, method and device |
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| CN105118468B (en) | 2018-05-22 |
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