CN104112438A - Compensation circuit applied to liquid crystal display panel and display device - Google Patents
Compensation circuit applied to liquid crystal display panel and display device Download PDFInfo
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- CN104112438A CN104112438A CN201410350564.8A CN201410350564A CN104112438A CN 104112438 A CN104112438 A CN 104112438A CN 201410350564 A CN201410350564 A CN 201410350564A CN 104112438 A CN104112438 A CN 104112438A
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Abstract
The invention discloses a compensation circuit applied to a liquid crystal display panel and a display device. The compensation circuit applied to the liquid crystal display panel comprises a power module and a compensation module, wherein the power module is used for providing a working voltage to the compensation module continuously when a power supply source is put through and cut off; the compensation module compensates a common voltage based on the working voltage. By adding the power module, charges stored in a capacitor are utilized for discharging after shutdown so as to provide the working voltage to the compensation module, so that the common voltage can be compensated, the problem that the charge discharging speed becomes slow after the shutdown is solved, therefore, the discharging speed of the charge can be speeded up after the applied voltage disappears, the liquid crystal is prevented from being polarized by the residual charges, asymmetric deviation of the liquid crystal is avoided after booting again, and effective control on the screen flicker phenomenon is realized.
Description
Technical field
The present invention relates to display technique field, be particularly applied to compensating circuit and the display device of display panels.
Background technology
Display device comprises the liquid crystal between lower glass substrate, top glass substrate and upper lower glass substrate, wherein in top glass substrate, is provided with colored filter and public electrode, is provided with thin film transistor (TFT) and pixel electrode in lower glass substrate.The corresponding pixel of each thin film transistor (TFT), liquid crystal molecule is subject to the control of electric field between pixel electrode and public electrode.The below of top glass substrate top and lower glass substrate is also respectively arranged with upper polarizer and lower polaroid, forms polarized light when having light to pass through lower polaroid, and this polarized light sees through liquid crystal molecule.Therefore by regulating the power of electric field between pixel electrode and public electrode, can control the angle of inclination of liquid crystal molecule, thereby control the rotation of polarized light, the transmitance of light is changed, form different images.
While working due to display device, can between upper lower glass substrate, produce electric field, have charge generation.During shutdown, the electric charge of these gatherings of loss of voltage that apply on pixel electrode and public electrode can not discharge disappearance immediately, and some electric charges discharges very slow, slow electric charge namely, and can in display device, there is the phenomenons such as image retention in this part electric charge.
During display device shutdown, have slow electric charge residual, cause liquid crystal to polarize under these residual slow charge effects.While again starting shooting, can on pixel electrode and public electrode, again power up, because the voltage applying is symmetrical, there is asymmetric deflection in polarized liquid crystal now under the effect of symmetrical voltage, deflection or overshoot are owed in generation, the brightness that causes display panel brightness of image when carrying out switching between previous frame image and next frame to compare normal demonstration there will be bright or excessively dark phenomenon, caused film flicker.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is how in shutdown, to accelerate afterwards the velocity of discharge of residual charge, suppresses film flicker.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of compensating circuit that is applied to display panels, comprise power module and compensating module, described power module is used for being continuously described compensating module when power supply energising and power-off provides operating voltage, and described compensating module compensates common electric voltage according to described operating voltage.
Optionally, described power supply provides alternating current, and described operating voltage is direct current.
Optionally, described power module comprises rectifier, capacitor and relay, the input end of described rectifier connects power supply, the output terminal of described rectifier connects the first end of described capacitor and the input end of described relay, the second end ground connection of described capacitor, wherein said rectifier is for changing power supply into direct current by alternating current, and whether described relay switches on to controlling according to power supply provides operating voltage by its contact to described compensating circuit.
Optionally, described rectifier is full-bridge rectifier.
Optionally, when described power supply no power, contact is connected, and the capacitance voltage on capacitor is operating voltage; When described power supply energising, contact disconnects, and capacitor does not provide operating voltage.
Optionally, described compensating module comprises voltage reduction module, load module, amplification module and output module, the input end of described voltage reduction module is connected with the output terminal of described power module, the output terminal of described voltage reduction module is connected with the power end of described amplification module, the input end of described amplification module is connected with the output terminal of described load module, the output terminal of described amplification module is connected with the input end of described output module, the input end of described load module is used for receiving common electric voltage, and the output terminal of described output module is for exporting the common electric voltage after compensation.
Optionally, described voltage reduction module is low-dropout regulator or power management integrated circuit.
Optionally, described compensating module comprises voltage stabilizing diode, filter capacitor and transistor, described voltage stabilizing diode and described filter capacitor are in parallel, one end of described voltage stabilizing diode and described filter capacitor is connected the output terminal of described power module, connect described transistorized grid simultaneously, the other end ground connection of described voltage stabilizing diode and described filter capacitor, described transistorized first end ground connection, the common electric voltage after the second end output compensation.
Optionally, described voltage stabilizing diode is semiconductor voltage-stabilizing diode.
For solving the problems of the technologies described above, the present invention also provides a kind of display device, comprise display panel, on described display panel, be provided with public electrode wire, also comprise the above-described compensating circuit that is applied to display panels, and the common electric voltage of the compensating module in described compensating circuit after affording redress to described public electrode wire.
(3) beneficial effect
The embodiment of the present invention is by increasing power module, after shutdown, utilize the charge discharge of storing on electric capacity, for compensating module provides operating voltage, can compensate common electric voltage, solve the rear slack-off problem of charge discharge speed of shutdown, thereby guarantee can accelerate the velocity of discharge of electric charge after the loss of voltage applying, prevent that liquid crystal is by residual charge polarization, liquid crystal generation asymmetric deflection while avoiding again starting shooting, realizes effectively and suppressing film flicker phenomenon.
Accompanying drawing explanation
Fig. 1 is the structural representation of the compensating circuit that is applied to display panels that provides of the embodiment of the present invention one;
Fig. 2 is the compensating circuit figure that is applied to display panels that the embodiment of the present invention one provides;
Fig. 3 is the complete composition diagram of full-bridge rectifier;
Fig. 4 is the compensating circuit figure that is applied to display panels that the embodiment of the present invention two provides;
Fig. 5 is that the embodiment mono-that comprises that the embodiment of the present invention three provides is applied to the schematic diagram of display device of the compensating circuit of display panels;
Fig. 6 is that the embodiment bis-that comprises that the embodiment of the present invention three provides is applied to the schematic diagram of display device of the compensating circuit of display panels.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
The invention provides the compensating circuit that is applied to display panels, its structural representation as shown in Figure 1, comprise power module 10 and compensating module 20, power module 10 provides operating voltage for being continuously compensating module 20 when power supply energising and the power-off, and compensating module 20 compensates common electric voltage according to operating voltage.
Optionally, power supply provides interchange, is generally the alternating current of 220V, i.e. AC220V, and operating voltage is direct current.
Because can being continuously compensating module, power module provides operating voltage, when power supply disconnects, can utilize residual charge as operating voltage, common electric voltage to be compensated, increase the velocity of discharge of electric charge, avoid liquid crystal to be polarized by residual charge, the problem of film flicker while again starting shooting after solution shutdown.
Embodiment mono-
The present embodiment provides the compensating circuit that is applied to display panels, comprises power module 10 and compensating module 20, and its physical circuit schematic diagram as shown in Figure 2.Power module 10 wherein comprises rectifier 11, capacitor 12 and relay, the input end of rectifier 11 connects power supply, the output terminal of rectifier 11 connects the first end of capacitor 12 and the first end of relay, the second end ground connection of capacitor 12, wherein rectifier 11 is for changing power supply into direct current by alternating current, capacitor 12 is for storage and discharge electric charge, and according to power supply, whether its contact is controlled in conducting to relay to compensating circuit 20, provides operating voltage.
Optionally, rectifier 11 is full-bridge rectifier, alternating current is accessed to full-bridge rectifier, full-bridge rectifier is the most frequently used circuit that utilizes the unidirectional general character of diode to carry out rectification, for changing alternating current into direct current, shown in Fig. 2, be the simple technique of painting of full-bridge rectifier, the complete composition diagram of full-bridge rectifier is as shown in Figure 3, specifically comprise four diodes, between two docking.Because alternating current is generally sine wave or cosine wave (CW), comprise the positive and negative two parts that alternately occur, during just half part of input sine wave, wherein two diode current flows, obtain positive output; During negative half part of input sine wave, another two diode current flows, because these two diodes are reversal connections, so output still obtains sinusoidal wave just half part.Although rectifier has two kinds of full-bridge rectifier and half bridge rectifier, adopts full-bridge rectifier to double than half bridge rectifier to the utilization ratio of input sine wave, so in the present embodiment, preferably adopt full-bridge rectifier.
General relay is comprised of coil 131 and contact 132 two parts, while there is no alternating current on rectifier 11, it is power supply no power, these coil 131 no currents pass through, contact 132 is connected, and also make this power module 10 and the compensating module 20 of rear end connect, thereby on capacitor 12, the electric charge of storage starts to discharge, capacitance voltage on capacitor 12 is operating voltage, for the compensating module of rear end provides electric current.While having alternating current on rectifier 11, i.e. power supply energising, capacitor 12 starts stored charge, these coil 131 energisings, contact 132 disconnects, and this power module 10 and the compensating module 20 of rear end are disconnected, and capacitor 12 does not provide operating voltage.
It should be noted that, power module 10 shown in Fig. 2 not only comprises beyond rectifier 11, capacitor 12 and relay, also comprise transformer, transistor and the electric capacity and the resistance that are arranged between contact 132 and coil 131, this part structure is in order to coordinate the normal work of other electron device, when wherein transformer has alternating current on rectifier, not can be considered and open circuit, the power supply that now power module provides for compensating module comes from the electric charge of storing on capacitor, the electric charge namely left behind too slowly due to electric discharge when display device is shut down.
Compensating module 20 comprises voltage reduction module 21, load module 22, amplification module 23 and output module 24, the input end of its voltage reduction module 21 is connected with the output terminal of power module 10, the output terminal of voltage reduction module 21 is connected with amplification module 23 power ends, the input end of amplification module 23 is connected with the output terminal of load module 22, the output terminal of amplification module 23 is connected with the input end of output module 24, the input end of load module 22 is used for receiving common electric voltage, and the output terminal of output module 24 is for exporting the common electric voltage after compensation.Receive common electric voltage, the loop forming through load module 22, amplification module 23 and output module 24, is finally feeding back to display panel.
Optionally, voltage reduction module 21 is low-dropout regulator (Low Drop Out, be called for short LDO) or power management integrated circuit (Power Management IC, be called for short PMIC), for operating voltage that power supply short circuit is provided, carry out step-down or voltage stabilizing, to provide stable voltage for rear end amplification module 23.
In sum, the compensating circuit that is applied to display panels that the present embodiment provides, by increasing power module, after shutdown, still can provide operating voltage for compensating module, utilize the electric charge of storing in power module as operating voltage, can compensate common electric voltage equally, the slack-off problem of charge discharge speed after solution ray machine, thereby guarantee to accelerate the velocity of discharge of electric charge after the loss of voltage applying, prevent that liquid crystal is by residual charge polarization, liquid crystal generation asymmetric deflection while avoiding again starting shooting, realizes effectively and suppressing film flicker phenomenon.
Embodiment bis-
A kind of compensating circuit that is applied to display panels is also provided in the present embodiment, its physical circuit schematic diagram as shown in Figure 3, power module 10 also comprises rectifier 11, capacitor 12 and relay, and circuit structure and principle of work, with embodiment mono-, repeat no more herein.
Be with embodiment mono-difference, compensating module 20 in the present embodiment comprises voltage stabilizing diode 25, filter capacitor 26 and transistor 27, wherein voltage stabilizing diode 25 and filter capacitor 26 parallel connections, voltage stabilizing diode 25 is connected the output terminal of power module 10 with one end of filter capacitor 26, the grid that simultaneously connects transistor 27, the other end ground connection of voltage stabilizing diode 25 and filter capacitor 26, the first end ground connection of transistor 27, the common electric voltage after the second end output compensation.
Voltage stabilizing diode 25 is also a kind of crystal diode, and the characteristic of utilizing the breakdown region of PN junction to have burning voltage is carried out work.In the present embodiment, voltage stabilizing diode 25 is preferably semiconductor voltage-stabilizing diode, also claims Zener diode.After the feature of voltage stabilizing diode punctures exactly, the voltage at its two ends remains unchanged substantially.After voltage stabilizing diode place in circuit, if when fluctuation or other reason occurring cause in circuit each point variation in voltage due to supply voltage, the voltage at load two ends will remain unchanged substantially.Because voltage stabilizing diode 25 has the function of voltage stabilizing, a filter capacitor 26 being arranged in parallel with voltage stabilizing diode generally also can be set, major function is filtering high frequency interference, and with the stability of intensifier circuit, the value of this electric capacity is generally 0.1～1 microfarad (μ F).
The preferred metal-oxide-semiconductor of transistor 27 in the present embodiment, be illustrated in figure 3 N-type metal-oxide-semiconductor, its grid (g) connects output terminal, voltage stabilizing diode 25 and the filter capacitor 26 of power module 10, source electrode (s) ground connection, drain electrode (d) connects public electrode wire, is its common electric voltage after affording redress.Certainly, transistor 27 can also be selected P type metal-oxide-semiconductor according to the concrete condition of circuit design, is not specifically limited.When on power module 10, power supply disconnects, transistor 27 conductings ground connection, discharge electric charge, so just can accelerate the velocity of discharge of electric charge, thus the problem of film flicker while again starting shooting after inhibition shutdown.
The present embodiment has the technique effect identical with embodiment mono-, repeats no more herein.
Embodiment tri-
For solving the problems of the technologies described above, the present invention also provides a kind of display device, except comprising display panel 30, on display panel 30, be provided with public electrode wire, also comprise the compensating circuit that is applied to display panels in embodiment mono-or embodiment bis-, the schematic diagram of this display device respectively as shown in Figure 5, Figure 6, and the common electric voltage of the compensating module that is applied to display panels after affording redress to the public electrode wire on display panel 30.
Because load module 22, amplification module 23 and output module 24 can form loop with display panel 30, can compensate common electric voltage, it is the common electric voltage that load module 22 receives display panel 30 feedbacks, and be transferred to amplification module 23 (being amplifier) and amplify processing, then be transmitted back to display panel 30 by output module 24.If power module provides in the absence of operating voltage in embodiment bis-, the only work when display device is started shooting of this partial circuit, does not work after shutdown.Because load module receives the common electric voltage that display panel 30 feeds back, amplification through amplification module, by compensating module, the common electric voltage after compensation is feedback to display panel 30 again, can avoid on display panel 30 occurring partially green phenomenon, but the scintillation occurring in the time of can not avoiding again starting shooting after shutdown.
The display device that the present embodiment provides comprises power module, the amplification module that can be continuously in compensating module in the time of can starting shooting in display device (having alternating current input), shutdown (there is no alternating current input) carries out the compensation of common electric voltage, solve the rear slow-paced problem of charge discharge of shutdown, avoid residual charge liquid crystal deflection to have a negative impact, thereby cause film flicker when solution is started shooting again.
Display device in the present embodiment can be: any product or parts with Presentation Function such as Electronic Paper, oled panel, mobile phone, panel computer, televisor, notebook computer, digital album (digital photo frame), navigating instrument.
Above embodiment is only for illustrating the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. be applied to the compensating circuit of display panels, it is characterized in that, comprise power module and compensating module, described power module is used for being continuously described compensating module when power supply energising and power-off provides operating voltage, and described compensating module compensates common electric voltage according to described operating voltage.
2. the compensating circuit that is applied to display panels as claimed in claim 1, is characterized in that, described power supply provides alternating current, and described operating voltage is direct current.
3. the compensating circuit that is applied to display panels as claimed in claim 1, it is characterized in that, described power module comprises rectifier, capacitor and relay, the input end of described rectifier connects power supply, the output terminal of described rectifier connects the first end of described capacitor and the input end of described relay, the second end ground connection of described capacitor, wherein said rectifier is for changing power supply into direct current by alternating current, and whether described relay switches on to controlling according to power supply provides operating voltage by its contact to described compensating circuit.
4. the compensating circuit that is applied to display panels as claimed in claim 3, is characterized in that, when described power supply no power, contact is connected, and the capacitance voltage on capacitor is operating voltage; When described power supply energising, contact disconnects, and capacitor does not provide operating voltage.
5. the compensating circuit that is applied to display panels as claimed in claim 3, is characterized in that, described rectifier is full-bridge rectifier.
6. the compensating circuit that is applied to display panels as claimed in claim 1, it is characterized in that, described compensating module comprises voltage reduction module, load module, amplification module and output module, the input end of described voltage reduction module is connected with the output terminal of described power module, the output terminal of described voltage reduction module is connected with the power end of described amplification module, the input end of described amplification module is connected with the output terminal of described load module, the output terminal of described amplification module is connected with the input end of described output module, the input end of described load module is used for receiving common electric voltage, the output terminal of described output module is for exporting the common electric voltage after compensation.
7. the compensating circuit that is applied to display panels as claimed in claim 6, is characterized in that, described voltage reduction module is low-dropout regulator or power management integrated circuit.
8. the compensating circuit that is applied to display panels as claimed in claim 1, it is characterized in that, described compensating module comprises voltage stabilizing diode, filter capacitor and transistor, described voltage stabilizing diode and described filter capacitor are in parallel, one end of described voltage stabilizing diode and described filter capacitor is connected the output terminal of described power module, connect described transistorized grid simultaneously, the other end ground connection of described voltage stabilizing diode and described filter capacitor, described transistorized first end ground connection, the common electric voltage after the second end output compensation.
9. the compensating circuit that is applied to display panels as claimed in claim 8, is characterized in that, described voltage stabilizing diode is semiconductor voltage-stabilizing diode.
10. a display device, comprise display panel, on described display panel, be provided with public electrode wire, it is characterized in that, also comprise the compensating circuit that is applied to display panels described in any one in claim 1-9, and the common electric voltage of the compensating module in described compensating circuit after affording redress to described public electrode wire.
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| CN201410350564.8A CN104112438B (en) | 2014-07-22 | 2014-07-22 | It is applied to compensating circuit and the display unit of display panels |
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| CN201410350564.8A CN104112438B (en) | 2014-07-22 | 2014-07-22 | It is applied to compensating circuit and the display unit of display panels |
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| CN104112438B CN104112438B (en) | 2016-06-01 |
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| CN104916263A (en) * | 2015-06-17 | 2015-09-16 | 深圳市华星光电技术有限公司 | Display panel and driving method thereof |
| CN105226780A (en) * | 2015-11-03 | 2016-01-06 | 信利半导体有限公司 | A kind of display unit |
| CN108257570A (en) * | 2018-02-09 | 2018-07-06 | 京东方科技集团股份有限公司 | Eliminate control circuit, its control method and the liquid crystal display device of power-off ghost shadow |
| CN108717333A (en) * | 2018-03-05 | 2018-10-30 | 广东欧珀移动通信有限公司 | Display control unit, control method, the terminal device of display screen |
| CN113205786A (en) * | 2021-05-07 | 2021-08-03 | 惠科股份有限公司 | Adjusting device and adjusting method for improving flicker of liquid crystal display device |
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| CN108717333A (en) * | 2018-03-05 | 2018-10-30 | 广东欧珀移动通信有限公司 | Display control unit, control method, the terminal device of display screen |
| CN113205786A (en) * | 2021-05-07 | 2021-08-03 | 惠科股份有限公司 | Adjusting device and adjusting method for improving flicker of liquid crystal display device |
| CN113205786B (en) * | 2021-05-07 | 2022-05-10 | 惠科股份有限公司 | Adjusting device and adjusting method for improving flicker of liquid crystal display device |
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