CN101089928A - Method and device for displaying panel state change - Google Patents
Method and device for displaying panel state change Download PDFInfo
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- CN101089928A CN101089928A CN 200610087030 CN200610087030A CN101089928A CN 101089928 A CN101089928 A CN 101089928A CN 200610087030 CN200610087030 CN 200610087030 CN 200610087030 A CN200610087030 A CN 200610087030A CN 101089928 A CN101089928 A CN 101089928A
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Abstract
A method for converting state of display face-plate includes exerting a low frequency AC voltage signal onto reference electrode and coordinating with driving voltage exerted onto data electrode to form state-conversion electric field between reference electrode and data electrode for making display face-plate be quickly converted on normal display state.
Description
Technical field
The invention relates to a kind of method of display panel state exchange, and particularly relevant for a kind of method of using low-frequency ac voltage to drive the display panel state exchange.
Background technology
Display panel is according to employed material, the type of drive different numerous species that are distinguished into light source allocation position etc.Wherein, optical compensation birefringence type (Optically CompensatedBirefringence, OCB) LCD has reaction velocity fast, can provide computer when fast-changing continuous pictures such as playing animation or film, smooth more picture performance is so it is very suitable for the application of high-order LCD.After but optical compensation birefringence LCD (to call the OCB LCD in the following text) must allow optical compensation birefringence type liquid crystal molecule (to call the OCB liquid crystal molecule in the following text) be transformed into bending status (Bend state) via spreading status (Splay state), just can enter holding state, and the rapid-action work performance is provided.
Figure 1A illustrates the OCB liquid crystal molecule synoptic diagram into spreading status.Figure 1B illustrates the OCB liquid crystal molecule synoptic diagram into bending status.Please jointly with reference to Figure 1A and Figure 1B, known OCB LCD 100 has OCB liquid crystal molecule 130, and it is disposed between colored optical filtering substrates 110 (color filter substrate) and the electric crystal array film substrate 120 (thin film transistor array substrate).Wherein, colored optical filtering substrates 110 has reference electrode 112 (common electrode), and electric crystal array film substrate 120 has a plurality of information electrodes 122 (only illustrating at this).Illustrate as Figure 1A, when not applying voltage on reference electrode 112 and information electrode 122 time, the electric field action of OCB liquid crystal molecule 130 because of being added, and arrange in the spreading status mode.Yet, illustrate as Figure 1B, when OCB LCD 100 is desired to enter holding state, must apply voltage respectively to reference electrode 112 and information electrode 122, and cause the transition electric field E of a vertical color optical filtering substrate 110 and electric crystal array film substrate 120.Because of being subjected to the influence of vertical transition electric field E, OCB liquid crystal molecule 130 will change bending status gradually into.
But known OCB LCD 100 needs several minutes time to carry out this polling if want driven, promptly before entering holding state, needs soaking out (warm up).So, this for OCB LCD 100 the characteristic with opening i.e. usefulness that should possess very unfavorable.Therefore, allow OCB LCD 100 is easier to be accepted by the consumer, transition (Fasttransition) is necessary fast.
In the known techniques, making the method for OCB liquid crystal molecule from the quick transition of spreading status to bending status is to apply high voltage colored optical filtering substrates 110 and electric crystal array film substrate 120, illustrates as Figure 1B.When OCB liquid crystal molecule 130 is subjected to time spent of doing of high transition electric field E that high voltage causes, OCB liquid crystal molecule 130 can be transformed into bending status from spreading status apace.But, this kind applies high-tension mode, it is can the corresponding source drive wafer (Source IC) that uses less, and this kind practice is when continuous switch OCB LCD, can allow the OCB liquid crystal molecule be subjected to high pressure for a long time, make and stored charge on the liquid crystal liquid crystal is caused bad effect, influence the stability of product.
Propose a kind of apparatus and method that drive liquid crystal panel in the at present existing U.S. US6476792 patent, make the transition fast of OCB liquid crystal molecule by a voltage pulse.Fig. 2 illustrates and is the circuit block diagram according to the liquid crystal panel control module that this patent illustrated.Please refer to Fig. 2, main member comprises control circuit 210, transition driving circuit (transformation drivingcircuit) 220, display driver circuit (display-driving circuit) 230 and switch (switch) 240 in the control module 200.Wherein, transition driving circuit 220 is used for producing a transition voltage, allows the OCB liquid crystal molecule be transformed into bending status from spreading status, and the driving voltage of display driver circuit 230 when producing normal show.Control circuit 210 is via gauge tap 240, with the driving voltage (V of control The whole control unit 200 outputs
Drive), make driving voltage (V
Drive) may be the transition voltage of transition driving circuit 220 outputs, or the signal of video signal of display driver circuit 230 outputs.This driving voltage (V
Drive) will be electrically connected to the information electrode 122 of Figure 1B.Therefore, the driving voltage (V of the fixed voltage of reference electrode 112 and information electrode 122 among Figure 1B
Drive) between form potential difference (PD), potential difference (PD) produces an electric field E thus again, allows OCB liquid crystal molecule 130 transitions and can driving when normal the demonstration.
Fig. 3 illustrates and is the output voltage mode chart according to the control module that this patent illustrated.Driving voltage (V among the figure
Drive) be one to have the square wave of fixed cycle during transition, its amplitude of oscillation is about-30～0 volts, and after during finishing transition, the OCB liquid crystal molecule is transformed into bending status by spreading status, and can be driven normally during showing.
With the US6476792 patent is example, because of by added transition driving circuit 220 in circuit, make the complexity of circuit increase, and therefore the area of circuit board also enlarges.And when during transition, since only with negative voltage by reference electrode 112 and the transition of 122 OCB liquid crystal molecules of information electrode, cause the stored charge of OCB liquid crystal molecule easily, the quality of influence demonstration, also can also cause bad influence, influence the stability of product the OCB liquid crystal molecule.
Summary of the invention
In view of this, purpose of the present invention just provides a kind of method of display panel state exchange, be used to make display panel be converted to normal display state during the transition from improper show state, and by driving the OCB LCD with low-frequency ac voltage, and then make the OCB liquid crystal molecule be transformed into bending status from spreading status apace, shorten warm-up period, and avoid liquid crystal being caused bad effect in OCB liquid crystal molecule stored charge.
A further object of the present invention provides a kind of device of display panel state exchange, can not increase the complexity of circuit in the script display panel, only need revise little part circuit and can reach, and has also avoided changing the processing procedure and the design of whole front panel.
Based on above-mentioned purpose and other purposes, the present invention proposes a kind of method of display panel state exchange, be used to make display panel be converted to normal display state during the transition from improper show state, wherein display panel comprises information electrode and reference electrode, the method of this display panel state exchange is included in and applies reference voltage during the transition to reference electrode and apply driving voltage to information electrode, so that form the transition electric field between reference electrode and information electrode, wherein reference voltage is to switch between first voltage quasi position and second voltage quasi position with a preset frequency.
According to the method for the described display panel state exchange of preferred embodiment of the present invention, above-mentioned preset frequency is between 2Hz and 60Hz.
According to the method for the described display panel state exchange of preferred embodiment of the present invention, when display panel was normal display state, the accurate position of tertiary voltage was fixed in the accurate position of above-mentioned reference voltage.
Method according to the described display panel state exchange of preferred embodiment of the present invention, in above-mentioned transition drive voltage is to switch on preset frequency between the 4th voltage quasi position and the 5th voltage quasi position, or makes driving voltage be fixed in the 6th voltage quasi position during transition.
During more being included in transition according to the method for the described display panel state exchange of preferred embodiment of the present invention, closing the display light source of display panel, and when finishing during the transition, open the display light source of display panel.
According to the method for the described display panel state exchange of preferred embodiment of the present invention, above-mentioned display panel comprises optical compensation birefringence type liquid crystal display panel.
Method according to the described display panel state exchange of preferred embodiment of the present invention, above-mentioned display panel comprises colored optical filtering substrates and electric crystal array film substrate, and reference electrode is arranged on the colored optical filtering substrates, and information electrode is arranged on the electric crystal array film substrate.
From another viewpoint, the present invention proposes a kind of device of display panel state exchange, be used to make display panel be converted to normal display state during the transition from improper show state, wherein display panel comprises information electrode and reference electrode, and the device of display panel state exchange comprises reference voltage unit, character used in proper names and in rendering some foreign names agate voltage cell, data driver and controller.Wherein, reference voltage unit is in order to the reference electrode of output reference voltage to display panel.Character used in proper names and in rendering some foreign names agate voltage cell is in order to export a plurality of character used in proper names and in rendering some foreign names agate voltages.The data driver electrically be connected to character used in proper names and in rendering some foreign names agate voltage cell select in order to the foundation display data a plurality of character used in proper names and in rendering some foreign names agate voltages one of them, outputting drive voltage is to the information electrode of display panel according to this.Controller is electrically connected to reference voltage unit, data driver and character used in proper names and in rendering some foreign names agate voltage cell, gives the data driver in order to the output display data.Controller is controlled reference voltage unit and reference voltage is switched on a preset frequency between first voltage quasi position and one second voltage quasi position during this transition, so that form a transition electric field between reference electrode and information electrode.
According to the device of the described display panel state exchange of preferred embodiment of the present invention, during above-mentioned transition, controller control character used in proper names and in rendering some foreign names agate voltage cell, and each character used in proper names and in rendering some foreign names agate voltage is all switched between the 4th voltage quasi position and the 5th voltage quasi position with preset frequency.
Device according to the described display panel state exchange of preferred embodiment of the present invention, above-mentioned character used in proper names and in rendering some foreign names agate voltage comprises a plurality of positive polarity character used in proper names and in rendering some foreign names agate voltages and a plurality of negative polarity character used in proper names and in rendering some foreign names agate voltage, and controller is controlled character used in proper names and in rendering some foreign names agate voltage cell during transition, so that a plurality of positive polarity character used in proper names and in rendering some foreign names agate voltages all are fixed in the 4th voltage quasi position, and make a plurality of negative polarity character used in proper names and in rendering some foreign names agate voltages all be fixed in the 5th voltage quasi position.
Device according to the described display panel state exchange of preferred embodiment of the present invention, above-mentioned controller is electrically connected to the panel light Source drive, so that during transition, close the display light source of display panel by the control panel light source drive, and when finishing during the transition, open the display light source of display panel by the control panel light source drive.
The present invention is because of by imposing reference electrode one low-frequency ac voltage signal, and collocation design puts on the driving voltage of information electrode, so that between reference electrode and information electrode, form the transition electric field, make display panel can be converted to normal display state fast.And because during transition, the polarity of transition electric field constantly changes, and has avoided OCB liquid crystal molecule stored charge, and liquid crystal is caused bad effect.And only, the processing procedure and the design of whole front panel will have been avoided changing by revising the circuit of fraction.
For above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Figure 1A illustrates the OCB liquid crystal molecule synoptic diagram into spreading status.
Figure 1B illustrates the OCB liquid crystal molecule synoptic diagram into bending status.
Fig. 2 illustrates and is the circuit block diagram according to the liquid crystal panel control module that this patent illustrated.
Fig. 3 illustrates and is the output voltage mode chart according to the control module that this patent illustrated.
Fig. 4 illustrates the diagrammatic cross-section into a kind of OCB LCD in the preferred embodiment of the present invention.
Fig. 5 illustrates the circuit block diagram into a kind of OCB LCD in the preferred embodiment of the present invention.
Fig. 6 illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.
Fig. 7 illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.
Fig. 8 illustrates the circuit diagram into character used in proper names and in rendering some foreign names agate voltage cell in the preferred embodiment of the present invention.
Fig. 9 A illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.
Fig. 9 B illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.
Figure 10 illustrates the circuit diagram into character used in proper names and in rendering some foreign names agate voltage cell in the preferred embodiment of the present invention.
Figure 11 illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.
Figure 12 illustrates the circuit diagram into character used in proper names and in rendering some foreign names agate voltage cell in the preferred embodiment of the present invention.
100: optical compensation birefringence LCD 110: colored optical filtering substrates
112: reference electrode 120: electric crystal array film substrate
122: information electrode 130: the optical compensation birefringence type liquid crystal molecule
E: transition electric field 200: control module
210: control circuit 220: the transition driving circuit
230: display driver circuit 240: switch
400: display 402,404: substrate
410: display panel 412: reference electrode
414: information electrode 416: the optical compensation birefringence type liquid crystal layer
420: module E ' backlight: electric field
V
Drive: driving voltage V
Com: reference voltage
510: controller 520: the data driver
530: character used in proper names and in rendering some foreign names agate voltage cell 540: scan line driver
550: display panel 560: reference voltage unit
561: reference voltage source
562,810,820,1010,1020,1210,1220: switch
570: panel light Source drive 580: module backlight
V
H: the first voltage quasi position V
L: second voltage quasi position
V
Ref: the accurate position of tertiary voltage V
G1～V
G5: negative polarity character used in proper names and in rendering some foreign names agate voltage
V
G6～V
G10: positive polarity character used in proper names and in rendering some foreign names agate voltage V
D1～V
D10: original character used in proper names and in rendering some foreign names agate voltage quasi position
V
DC: the 6th voltage quasi position V
DH: the 4th voltage quasi position
V
DL: the 5th voltage quasi position
Embodiment
The present invention is when starting display panel (for example making the OCB display panels be transformed into bending status by spreading status), form the transition electric field of low-frequency ac voltage earlier, make display panel be converted to normal display state, and then shorten the warm-up period of display from improper show state.Below will the present invention be described, but it is not in order to limit the present invention, to have the knack of this skill person and can do modification slightly to following embodiment according to spirit of the present invention, precisely because still belong to scope of the present invention for embodiment.For aspect explanation embodiments of the invention, below will as embodiment the display that institute of the present invention desire drives be described with the OCB LCD.
Fig. 4 illustrates the diagrammatic cross-section into a kind of OCB LCD in the preferred embodiment of the present invention.Please refer to Fig. 4, display 400 comprises a display panel 410 and a module 420 backlight, wherein, display panel 410 includes a reference electrode 412, a plurality of information electrode 414 and the optical compensation birefringence type liquid crystal layer 416 between reference electrode 412 and information electrode 414.Reference electrode 412 is formed on the substrate 402, and this substrate 402 for example is a colored optical filtering substrates, and information electrode 414 is formed on another substrate 404, and this substrate 404 for example is an electric crystal array film substrate.In this embodiment, if display 400 is active LCD, reference electrode 412 is to use electrode altogether, and information electrode 414 is a plurality of pixel electrodes (one of them pixel electrode only draws among the figure), and each pixel electrode meeting and an active member (for example being membrane transistor) electric connection.In addition, 420 back sides that are disposed at display panels 410 of module backlight are to provide display 400 show images required light source.
Fig. 5 illustrates the circuit block diagram into a kind of OCB LCD in the preferred embodiment of the present invention.Main member comprises controller 510, data driver 520, character used in proper names and in rendering some foreign names agate voltage cell 530, scan line driver 540, display panel 550, reference voltage unit 560, panel light Source drive 570 and module 580 backlight among Fig. 5.Wherein, controller 510 is electrically connected to data driver 520, character used in proper names and in rendering some foreign names agate voltage cell 530, scanning linear driver 540, reference voltage unit 560 and panel light Source drive 570 respectively, in order to control and the circuit of output data to each several part respectively.Character used in proper names and in rendering some foreign names agate voltage cell 530 is in order to exporting a plurality of character used in proper names and in rendering some foreign names agate voltages, and in this embodiment, character used in proper names and in rendering some foreign names agate voltage cell 530 is for example exported the character used in proper names and in rendering some foreign names agate voltage of five groups of positive polaritys and the character used in proper names and in rendering some foreign names agate voltage of five groups of negative polarity.And data driver 520 is electrically connected to character used in proper names and in rendering some foreign names agate voltage cell 530, and selects character used in proper names and in rendering some foreign names agate voltage, an outputting drive voltage (V according to this according to display data
Drive) to the information electrode of display panel 550.
In this embodiment, display panel 550 contains a plurality of picture elements, and the structure of each picture element is all the structure of the display panel 410 in the OCB LCD 400 among Fig. 4.And the driving voltage (V of data driver 520 outputs
Drive) will for example put on the information electrode 414 among Fig. 4 the reference voltage (V of reference voltage unit 560 outputs
Com) also will for example put on the reference electrode 412 among Fig. 4, so that between reference electrode 414 and information electrode 412, form electric field E ', drive OCB liquid crystal layer 416.
Because the OCB LCD must be through during the transition, allow the OCB liquid crystal molecule be transformed into bending status by spreading status after, just can enter holding state (being normal display state), and then normally show the picture of desire output.Event is following will be according to embodiments of the invention, cooperate Fig. 4 four kinds of different transition methods to be described with Fig. 5, allow the OCB LCD enter normal display state through during the transition fast, so know this operator and should know that the present invention does not limit this four kinds of methods.
First kind of transition method is to put on the reference electrode with a pulse square wave voltage signal during the transition, and the normal driving voltage of arranging in pairs or groups puts on the information electrode, so that between reference electrode and information electrode, form the transition electric field, allow the OCB LCD enter normal display state fast.Fig. 6 illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.Illustrate reference voltage V among Fig. 6 respectively
Com, driving voltage V
DriveWaveform with the power supply of module backlight, and be (the OCB LCD is at the state of improper demonstration at this moment) during the transition between time 0～t, and after time t, during will finishing during the transition and entering demonstration (this moment, the OCB LCD was converted to the state of normal demonstration).
Please be simultaneously with reference to Fig. 4, Fig. 5 and Fig. 6, when during transition, the controlling signal of controller 510 outputs one preset frequency removes to control switch 562, allows switch 562 switch the output first voltage quasi position (V with this preset frequency
H) and the second voltage quasi position (V
L).Therefore, reference voltage unit 560 output voltage swing during transition is V
L～V
HThe pulse square wave voltage signal as reference voltage V
ComAt this, the preset frequency of above-mentioned controlling signal promptly determines the switching frequency of switch, has also just determined this reference voltage V
ComFrequency.In this embodiment, this preset frequency can be between 2Hz between the 60Hz, but does not limit its scope.And during transition the time, data driver 520 and the driving voltage (V of character used in proper names and in rendering some foreign names agate voltage cell 530 with output
Drive) be normal document signal.And driving voltage (V
Drive) will put on the information electrode 414 among Fig. 4 reference voltage (V
Com) also will put on the reference electrode 412 among Fig. 4, so that between information electrode 414 and reference electrode 412, form a transition electric field, allow the OCB liquid crystal molecule be able to be transformed into bending status by spreading status apace.And in this embodiment, during transition, reference voltage (V
Com) the amplitude of oscillation greater than driving voltage (V
Drive) the amplitude of oscillation.
After during finishing transition, the OCB LCD has entered normal display state, and controller 510 will be controlled switch 562 and switch to the accurate position of tertiary voltage (V at this moment
Ref), make during showing, reference voltage (V that reference voltage unit 560 is exported
Com) accurate position will be fixed in the accurate position of tertiary voltage (V always
Ref).
In addition, when during transition, not the driving voltage (V of demand because of the voltage on the information electrode
Drive), cause the cross-pressure of OCB liquid crystal molecule incorrect, cause the OCB LCD can demonstrate in disorder picture, so when practical application, controller 510 meetings control panel light source drive 570 during transition is closed the power supply of module 580 backlight, and in disorder picture can not seen by the user.And after during finishing transition, controller 510 is the power supply of meeting control panel light source drive 570 outputs module 580 backlight, opens the display light source of display panel, with display frame normally.
Can find out by first kind of above-mentioned transition mode, only need in the reference voltage unit 560 of script display panel, add a switch, be used for receiving the controlling signal of controller, just can make the OCB LCD enter the state of normal demonstration fast.Such practice will can not increase the complexity of circuit in the script display panel, only need revise the design of little part circuit and can reach, and also avoid changing the processing procedure and the design of integral panels.
Driving voltage (V by Fig. 6
Drive) and reference voltage (V
Com) waveform can find out, put on the information electrode of display panel and the cross-pressure positive-negative polarity between the reference electrode is alternate with each other, make the rotation that the OCB liquid crystal molecule does not stop, and avoid OCB liquid crystal molecule stored charge, also just increased the stability of OCB liquid crystal molecule.
Second kind of transition method is to put on the reference electrode with a pulse square wave voltage signal during the transition, and the fixing driving voltage of arranging in pairs or groups puts on the information electrode, so that between reference electrode and information electrode, form the transition electric field, allow the OCB LCD can enter normal display state apace.Fig. 7 illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.Illustrate reference voltage V among Fig. 7 respectively
Com, driving voltage V
DriveWaveform with the power supply of module backlight, and be (the OCB LCD is at the state of improper demonstration at this moment) during the transition between time 0～t, and after time t, during will finishing during the transition and entering demonstration (this moment, the OCB LCD was converted to the state of normal demonstration).
Second kind of transition method and first kind of transition method are similar, when different places is during the transition, and driving voltage (V
Drive) no longer be document signal, and become the voltage of fixing accurate position.Its practice is to utilize character used in proper names and in rendering some foreign names agate voltage cell 530 among improvement Fig. 5, to produce the character used in proper names and in rendering some foreign names agate voltage that only has fixing accurate position during transition.Fig. 8 illustrates the circuit diagram into character used in proper names and in rendering some foreign names agate voltage cell in the preferred embodiment of the present invention.
Comprise two groups of switchs 810,820 among Fig. 8, and character used in proper names and in rendering some foreign names agate voltage cell 530 is for example exported ten character used in proper names and in rendering some foreign names agate voltage V
G1～V
G10, V wherein
G1～V
G5Be negative polarity character used in proper names and in rendering some foreign names agate voltage, V
G6～V
G10Be positive polarity character used in proper names and in rendering some foreign names agate voltage.V
D1～V
D10Be 10 original character used in proper names and in rendering some foreign names agate voltage quasi positions, and V
DCIt is the 6th voltage quasi position.In present embodiment, the 6th voltage quasi position V
DCAccurate position can with the accurate position of tertiary voltage V
RefIdentical.Please be simultaneously with reference to Fig. 5, Fig. 7 and Fig. 8, when during transition, controller 510 will be exported a controlling signal, allow each switch in switch 810 and 820 all switch to the 6th voltage quasi position (V
DC).This moment, data driver 520 was still according to display data and in V
G1～V
G10Character used in proper names and in rendering some foreign names agate voltage of middle selection is no matter but select V this moment
G1～V
G10In that character used in proper names and in rendering some foreign names agate voltage, all can export the 6th voltage quasi position (V
DC), make 520 one of the output of data driver have the accurate position of fixed voltage V
DCDriving voltage (V
Drive).
After during finishing transition, the OCB LCD has entered normal display state, and each switch that controller 510 will be controlled in switch 810 and 820 this moment switches to original character used in proper names and in rendering some foreign names agate voltage quasi position (V respectively
D1～V
D10), make during showing, data driver 520 can be normally according to display data, the driving voltage (V that output is corresponding
Drive).
The third transition method is to put on the reference electrode with a pulse square wave voltage signal during the transition, and the driving voltage that only has positive-negative polarity of arranging in pairs or groups puts on the information electrode, so that between reference electrode and information electrode, form the transition electric field, allow the OCB LCD enter normal display state.Fig. 9 A illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.Illustrate reference voltage V among Fig. 9 A respectively
Com, driving voltage V
DriveWaveform with the power supply of module backlight, and be (the OCB LCD is at the state of improper demonstration at this moment) during the transition between time 0～t, and after time t, during will finishing during the transition and entering demonstration (this moment, the OCB LCD was converted to the state of normal demonstration).
The third transition method and second kind of transition method are similar, when different places is during the transition, and driving voltage (V
Drive) no longer be fixed voltage, and become voltage with positive-negative polarity, its practice is to utilize character used in proper names and in rendering some foreign names agate voltage cell 530 among improvement Fig. 5, to produce the character used in proper names and in rendering some foreign names agate voltage that only has positive-negative polarity.Figure 10 illustrates the circuit diagram into character used in proper names and in rendering some foreign names agate voltage cell in the preferred embodiment of the present invention.
Comprise two groups of switchs 1010,1020 among Figure 10, and character used in proper names and in rendering some foreign names agate voltage cell 530 is for example exported ten character used in proper names and in rendering some foreign names agate voltage V
G1～V
G10, V wherein
G1～V
G5Be negative polarity character used in proper names and in rendering some foreign names agate voltage, V
G6～V
G10Be positive polarity character used in proper names and in rendering some foreign names agate voltage.V
D1～V
D10Be 10 original character used in proper names and in rendering some foreign names agate voltage quasi positions, and V
DLBe the 5th voltage quasi position, V
DHIt is the 4th voltage quasi position.Please be simultaneously with reference to Fig. 5, Fig. 9 A and Figure 10, when during transition, controller 510 will be exported a controlling signal, and this controlling signal allows five switches in the switch 1010 all switch to the 5th voltage quasi position (V
DL), and five switches in the switch 1020 also all switch to the 4th voltage quasi position (V
DH).This moment, data driver 520 was still according to display data and from V
G1～V
G10Character used in proper names and in rendering some foreign names agate voltage of middle selection.That is, when desiring output negative pole driving voltage V
DriveThe time, data driver 520 can be according to display data and from V
G1～V
G5Character used in proper names and in rendering some foreign names agate voltage of middle selection; And when desiring output cathode driving voltage V
DriveThe time, data driver 520 can be according to display data and from V
G6～V
G10Character used in proper names and in rendering some foreign names agate voltage of middle selection.Yet, when desiring output negative pole driving voltage V
DriveThe time, no matter select V this moment
G1～V
G5In that negative polarity character used in proper names and in rendering some foreign names agate voltage, all can export the 5th voltage quasi position (V
DL); And when desiring output cathode driving voltage V
DriveThe time, no matter select V this moment
G6～V
G10In that positive polarity character used in proper names and in rendering some foreign names agate voltage, all can export the 4th voltage quasi position (V
DH), make data driver 520 export a driving voltage (V who only has positive-negative polarity
Drive).And reference voltage (V in this embodiment,
Com) the amplitude of oscillation greater than driving voltage (V
Drive) the amplitude of oscillation.
If data driver 520 is the driving methods that adopt " some counter-rotating ", then the polarity of neighbor is just the opposite in the display panel 550.Therefore, if the driving voltage of a certain data channel is shown in Fig. 9 A in the display panel 550, the driving voltage (V of its adjacent data channel then
Drive) waveform may be for shown in Fig. 9 B.Fig. 9 B illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.Driving voltage (V among Fig. 9 A
Drive) polarity just and reference voltage (V
Com) identical, and driving voltage (V among Fig. 9 B
Drive) polarity just and reference voltage (V
Com) opposite.And during transition, as driving voltage (V
Drive) polarity just and reference voltage (V
Com) when opposite, the cross-pressure between information electrode and reference electrode is a maximal value, so the transition faster of OCB liquid crystal molecule.
After during finishing transition, the OCB LCD has entered normal display state, and controller 510 will be controlled switch 1010 and 1020 and switch to original character used in proper names and in rendering some foreign names agate voltage quasi position (V at this moment
D1～V
D10), make that in the demonstration time data driver 520 can be normally according to display data, outputting drive voltage (V
Drive).
Because the third transition method, can't guarantee that the cross-pressure between information electrode and reference electrode is a maximal value, so proposing the 4th kind of transition method is putting on the reference electrode with a pulse square wave voltage signal during the transition, and collocation also applies a pulse square wave voltage signal on information electrode, so that between reference electrode and information electrode, form the transition electric field, allow the OCB LCD enter normal display state.Figure 11 illustrates the mode chart into display panel state transition method in the preferred embodiment of the present invention.Illustrate reference voltage V among Figure 11 respectively
Com, driving voltage V
DriveWaveform with the power supply of module backlight, and be (the OCB LCD is at the state of improper demonstration at this moment) during the transition between time 0～t, and after time t, during will finishing during the transition and entering demonstration (this moment, the OCB LCD was converted to the state of normal demonstration).
The 4th kind of transition method and the third transition method are similar, in different places is during the transition, and driving voltage (V
Drive) and reference voltage (V
Com) having opposite polarity at one time, its practice is to utilize character used in proper names and in rendering some foreign names agate voltage cell 530 among improvement Fig. 5, to have guaranteed the driving voltage (V of data driver 520 outputs
Drive) have opposite polarity with reference voltage.Figure 12 illustrates the circuit diagram into character used in proper names and in rendering some foreign names agate voltage cell in the preferred embodiment of the present invention.
Comprise two groups of switchs 1210,1220 among Figure 12, and character used in proper names and in rendering some foreign names agate voltage cell 530 is for example exported ten character used in proper names and in rendering some foreign names agate voltage V
G1～V
G10, V wherein
G1～V
G5Be negative polarity character used in proper names and in rendering some foreign names agate voltage, V
G6～V
G10Be positive polarity character used in proper names and in rendering some foreign names agate voltage.V
D1～V
D10Be 10 original character used in proper names and in rendering some foreign names agate voltage quasi positions, V
ACIt is a pulse square wave voltage signal.In present embodiment, pulse square wave voltage signal V
ACCan be to have and reference voltage V
ComIdentical preset frequency, and switch on the 4th voltage quasi position V
DHWith one the 5th voltage quasi position V
DLBetween square-wave voltage.In addition, during transition, pulse square wave voltage signal V
ACWith reference voltage (V
Com) at one time polarity is opposite each other.
Please be simultaneously with reference to Fig. 5, Figure 11 and Figure 12, when during transition, controller 510 will be exported a controlling signal, and this controlling signal allows each switch in switch 1210 and 1220 all switch to pulse square wave voltage signal (V
AC) on.This moment, data driver 520 was still according to display data and from V
G1～V
G10Character used in proper names and in rendering some foreign names agate voltage of middle selection is no matter but select V this moment
G1～V
G10In that character used in proper names and in rendering some foreign names agate voltage, all can export pulse square wave voltage signal (V
AC), make data driver 520 export pulse square wave voltage signal (V
AC) as driving voltage (V
Drive).And during transition, because this pulse square wave voltage signal (V
AC) have the identical frequency of being exported with reference voltage source 561 of pulse square wave voltage signal, synchronous with the pulse square wave voltage signal that reference voltage source 561 is exported again, so can both guarantee driving voltage (V in each time
Drive) and reference voltage (V
Com) have opposite polarity, and this pulse square wave voltage signal (V
AC) switch on the 4th voltage quasi position (V
DH) and ground and the 5th voltage quasi position (V
DL) between.And reference voltage (V in this embodiment,
Com) the amplitude of oscillation greater than driving voltage (V
Drive) the amplitude of oscillation.
After during finishing transition, the OCB LCD has entered normal display state, and controller 510 will be controlled switch 1210 and 1220 and switch to original character used in proper names and in rendering some foreign names agate voltage quasi position (V at this moment
D1～V
D10), make that in the demonstration time data driver 520 can be normally according to display data, outputting drive voltage (V
Drive).
In sum, a kind of method of display panel state exchange is provided in the present invention, by reference electrode being imposed a low-frequency ac voltage signal, and collocation design puts on the driving voltage of information electrode, so that between reference electrode and information electrode, form the transition electric field, make display panel can be converted to normal display state fast.And because during transition, allow the transition electric polarity that puts on reference electrode and the information electrode constantly change, avoided OCB liquid crystal molecule stored charge, liquid crystal has been caused bad effect, also allowed the cross-pressure that is applied on the liquid crystal molecule can not influence the quality that during showing, shows.And the device of the display panel state exchange that proposes among the present invention will can not increase the complexity of circuit in the script display panel, only need revise little part circuit can reach, and has also avoided changing the processing procedure and the design of whole front panel.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can 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 (19)
1. the method for a display panel state exchange, be used to make a display panel be converted to a normal display state during the transition from an improper show state, wherein this display panel comprises information electrode and reference electrode, and the method for this display panel state exchange comprises:
In applying a reference voltage during this transition to this reference electrode and apply a driving voltage to this information electrode, so that form a transition electric field between this reference electrode and this information electrode, wherein this reference voltage is to switch between one first voltage quasi position and one second voltage quasi position with a preset frequency.
2. according to the method for the described display panel state exchange of claim 1, wherein this preset frequency is between 2Hz and 60Hz.
3. according to the method for the described display panel state exchange of claim 1, wherein the amplitude of oscillation of this reference voltage is greater than the amplitude of oscillation of this driving voltage.
4. according to the method for the described display panel state exchange of claim 1, wherein when this display panel was this normal display state, the accurate position of a tertiary voltage was fixed in the accurate position of this reference voltage.
5. according to the method for the described display panel state exchange of claim 1, wherein during this transition, this driving voltage is to switch between one the 4th voltage quasi position and one the 5th voltage quasi position with this preset frequency.
6. according to the method for the described display panel state exchange of claim 1, wherein during this transition, make this driving voltage be fixed in one the 6th voltage quasi position.
7. according to the method for the described display panel state exchange of claim 1, more comprise:
During this transition, close the display light source of this display panel; And
When finishing during this transition, open the display light source of this display panel.
8. according to the method for the described display panel state exchange of claim 1, wherein this display panel comprises an optical compensation birefringence type liquid crystal display panel.
9. according to the method for the described display panel state exchange of claim 1, wherein this display panel comprises a colored optical filtering substrates and an electric crystal array film substrate, and this reference electrode is arranged on this colored optical filtering substrates, and this information electrode is arranged on this electric crystal array film substrate.
10. the device of a display panel state exchange, be used to make a display panel be converted to a normal display state during the transition from an improper show state, wherein this display panel comprises information electrode and reference electrode, and the device of this display panel state exchange comprises:
One reference voltage unit is in order to export the reference electrode of a reference voltage to this display panel;
One character used in proper names and in rendering some foreign names agate voltage cell is in order to export a plurality of character used in proper names and in rendering some foreign names agate voltages;
One data driver is electrically connected to this character used in proper names and in rendering some foreign names agate voltage cell, in order to according to a display data and select those character used in proper names and in rendering some foreign names agate voltages one of them, with the information electrode of outputting drive voltage to this display panel; And
One controller is electrically connected to this reference voltage unit, this data driver and this character used in proper names and in rendering some foreign names agate voltage cell, gives this data driver in order to export this display data; Wherein during this transition, this controller is controlled this reference voltage unit and this reference voltage is switched between one first voltage quasi position and one second voltage quasi position with a preset frequency, so that form a transition electric field between this reference electrode and this information electrode.
11. according to the device of the described display panel state exchange of claim 10, wherein this preset frequency is between 2Hz and 60Hz.
12. according to the device of the described display panel state exchange of claim 10, wherein the amplitude of oscillation of this reference voltage is greater than the amplitude of oscillation of this driving voltage.
13. according to the device of the described display panel state exchange of claim 10, wherein when this display panel was this normal display state, this controller was controlled this reference voltage unit and is made the accurate position of this reference voltage be fixed in the accurate position of a tertiary voltage.
14. device according to the described display panel state exchange of claim 10, wherein during this transition, this controller is controlled this character used in proper names and in rendering some foreign names agate voltage cell, and those character used in proper names and in rendering some foreign names agate voltages are all switched between one the 4th voltage quasi position and one the 5th voltage quasi position with this preset frequency.
15. device according to the described display panel state exchange of claim 10, wherein those character used in proper names and in rendering some foreign names agate voltages comprise a plurality of positive polarity character used in proper names and in rendering some foreign names agate voltages and a plurality of negative polarity character used in proper names and in rendering some foreign names agate voltage, and this controller is controlled this character used in proper names and in rendering some foreign names agate voltage cell during this transition, so that those positive polarity character used in proper names and in rendering some foreign names agate voltages all are fixed in one the 4th voltage quasi position, and make those negative polarity character used in proper names and in rendering some foreign names agate voltages all be fixed in one the 5th voltage quasi position.
16. according to the device of the described display panel state exchange of claim 10, wherein during this transition, this controller is controlled this character used in proper names and in rendering some foreign names agate voltage cell, and makes those character used in proper names and in rendering some foreign names agate voltages all be fixed in one the 6th voltage quasi position.
17. according to the device of the described display panel state exchange of claim 10, wherein this controller more is electrically connected to a panel light source drive, so that close the display light source of this display panel during this transition by this panel light Source drive of control; And when finishing during this transition, open the display light source of this display panel by this panel light Source drive of control.
18. according to the device of the described display panel state exchange of claim 10, wherein this display panel comprises an optical compensation birefringence type liquid crystal display panel.
19. device according to the described display panel state exchange of claim 10, wherein this display panel comprises a colored optical filtering substrates and an electric crystal array film substrate, and this reference electrode is arranged on this colored optical filtering substrates, and this information electrode is arranged on this electric crystal array film substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100870306A CN100511355C (en) | 2006-06-12 | 2006-06-12 | Method and device for displaying panel state change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100870306A CN100511355C (en) | 2006-06-12 | 2006-06-12 | Method and device for displaying panel state change |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101089928A true CN101089928A (en) | 2007-12-19 |
| CN100511355C CN100511355C (en) | 2009-07-08 |
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ID=38943266
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100870306A Expired - Fee Related CN100511355C (en) | 2006-06-12 | 2006-06-12 | Method and device for displaying panel state change |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI396179B (en) * | 2009-08-26 | 2013-05-11 | Raydium Semiconductor Corp | Low power driving method for a display panel and driving circuit therefor |
| TWI470318B (en) * | 2011-11-02 | 2015-01-21 | Himax Display Inc | Liquid crystal display panel and pixel driving method thereof |
-
2006
- 2006-06-12 CN CNB2006100870306A patent/CN100511355C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI396179B (en) * | 2009-08-26 | 2013-05-11 | Raydium Semiconductor Corp | Low power driving method for a display panel and driving circuit therefor |
| TWI470318B (en) * | 2011-11-02 | 2015-01-21 | Himax Display Inc | Liquid crystal display panel and pixel driving method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100511355C (en) | 2009-07-08 |
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