CN100351877C - Method for driving ferroelectric panel display device - Google Patents
Method for driving ferroelectric panel display device Download PDFInfo
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- CN100351877C CN100351877C CNB2005100419853A CN200510041985A CN100351877C CN 100351877 C CN100351877 C CN 100351877C CN B2005100419853 A CNB2005100419853 A CN B2005100419853A CN 200510041985 A CN200510041985 A CN 200510041985A CN 100351877 C CN100351877 C CN 100351877C
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Abstract
The present invention discloses a method for driving a ferroelectric panel display device. A field image is divided into a plurality of subfields according to time, each subfield comprises an addressing period and a display period, and operation is accomplished according to modes displayed at an addressing edge. In each subfield, opposite polarization is accomplished in addressed units, and units which are not addressed remain a constant polarization direction. After a row is addressed, forward polarization voltage is exerted to all units in the row to enter the display period, and meanwhile, an addressing voltage (an opposite polarization voltage) is exerted to a next row to enter the addressing period. Different addressing voltages are exerted to the addressing period of each subfield so that addressed units form opposite polarization with different intensity. Electronic beams with different current intensity are emitted in the display period, fluorescent powder is stimulated to generate visible light with different intensity after the electronic beams pass through an ITO anode, and units which are not addressed can not emit light. The light intensity of the subfields in the display period is combined in a certain proportion so that high gray scale image display is obtained.
Description
Technical field
The present invention relates to the driving method of flat-panel monitor, the particularly a kind of driving method that can realize that ferroelectric flat panel display addressing and gray scale show.
Background technology
The electronics emission phenomenon of ferroelectric thin film negative electrode has obtained broad research in recent years.Be different from the emission of cold cathode field-causing electron, the ferroelectric thin film negative electrode is by the electric polarization counter-rotating of film inside the compensate for electronic on surface to be repelled out, is not having can to launch electronics under the situation of extraction voltage, is a kind of novel low-voltage electronic emission material.In order to reduce cost and to be beneficial to large-scale production, people expect that flat-panel display device can be at the voltage levvl of integrated circuit (IC) apparatus, promptly operate from several lying prostrate in 100 volts the scope.Nineteen ninety-five, the people such as O.Auciello of the U.S. tested discovery (Applied PhysicsLetters, 66 volumes, 17 phases, 1995, the 2183-2185 page or leaf): PLZT (lead lanthanum zirconate titanate) ferroelectric thin film of 80-110 μ m thickness is under the 100-400V pulse voltage, and can obtain current density is 0.5-1.5mA/cm
2Electronics emission; 0.8 PZT (lead zirconate titanate) ferroelectric thin film of μ m thickness is under the 10-40V pulse voltage, can obtain current density is 0.07-0.15 μ A/cm
2Electronics emission.(Applied Physics Letters is found in the F.Liu of the U.S. in 2000 and C.B.Fleddermann experiment, 76 volumes, 12 phases, 2000,1618-1620): the PNZT of 0.8 μ m thickness (lead zirconate titanate niobium) ferroelectric thin film is under the 22V pulse voltage, and can obtain current density is 10 μ A/cm
2Electronics emission.These discoveries make ferroelectric thin film be applied to flat-panel display device becomes possibility.Though existing document (U.S. Patent No. 5,453,661, issue in nineteen ninety-five and U.S. Patent No. 5,508,590, issue in 1996) propose to adopt the emission of ferroelectric material electronics to realize flat pannel display, but only provided the light emitting array structure, how to realize that the demonstration of address pixels and gray scale does not appear in the newspapers as yet.
Summary of the invention
The objective of the invention is to propose a kind of driving method of ferroelectric flat panel display spare, this method can realize that the addressing operation of ferroelectric flat panel display and gray scale show.
Technical scheme of the present invention is achieved in that
An input picture is divided into two son fields at least shows that each son field comprises an address period and a demonstration phase; Carry out addressing in address period by addressing mode line by line, the intact delegation of addressing just shows delegation, is the working method that addressing limit, a kind of limit shows.During addressing delegation, want luminous unit to apply addressing voltage (reverse polarization voltage) to this row, voltage is higher than voltage on the addressing electrode X electrode on the scan electrode Y electrode at this moment, make must be luminous the unit in ferroelectric thin film carry out reverse polarization, utilize the memory function of ferroelectric thin film to realize the addressing of display unit; After delegation's addressing is intact, apply the forward polarizing voltage immediately and enter the demonstration phase, simultaneously next line is applied reverse polarization voltage and carry out addressing, interim in demonstration, the unit that is addressed is that electron beam is launched in the unit of reverse polarization after applying the forward polarizing voltage, and the impact fluorescence powder is luminous after ito anode voltage quickens.
Address period in each height field, by applying the addressing voltage that varies in size is reverse polarization voltage, make the reverse polarization of the ferroelectric thin film formation varying strength of the unit that is addressed in each son field, showing the electron beam of launching different strength of current under the phase forward polarizing voltage effect subsequently, thereby the impact fluorescence powder sends the visible light of varying strength, each height field is made up in the luminous intensity ratio, can realize that the image of high gray shade scale shows.
In address period, when the voltage on the scan electrode Y electrode is higher than voltage on the addressing electrode X electrode, ferroelectric thin film in the display unit is carried out reverse polarization; Show interimly, when voltage on the scan electrode Y electrode is lower than on the addressing electrode X electrode voltage, ferroelectric thin film in the display unit is carried out the forward polarization.
Showing interimly, when the voltage on the scan electrode Y electrode was lower than voltage on the addressing electrode X electrode, it was that electron beam is launched in the unit of reverse polarization after applying the forward polarizing voltage that ferroelectric thin film in the display unit is carried out unit that the forward polarization is addressed.
In the demonstration phase, the forward polarizing voltage that all display units apply is identical, makes at the unit emitting electrons excitated fluorescent powder that address period was addressed luminously, and then the emitting electrons excitated fluorescent powder is not luminous in the unit of addressing.
The driving voltage that is used on addressing electrode and the scan electrode at 10V between the 100V.
Ito anode applies a direct current high voltage all the time, the magnitude of voltage of dc high voltage at 300V between the 3000V.
The driving method of the ferroelectric flat panel display spare that the present invention proposes can realize that the immediate addressing operation of ferroelectric flat panel display and the image of high gray shade scale show.
Description of drawings
Fig. 1 is ferroelectric thin film electronics emission principle figure in the ferroelectric flat panel display display unit of the present invention;
Fig. 2 is a ferroelectric flat panel display electrode structural chart of the present invention;
Fig. 3 is the ferroelectric flat panel display driving method schematic diagram that the present invention proposes;
Fig. 4 is one of son driving method drive waveforms embodiment of proposing of the present invention;
Fig. 5 is two of son the driving method drive waveforms embodiment that proposes of the present invention
Fig. 6 is three of son the driving method drive waveforms embodiment that proposes of the present invention;
Fig. 7 is four of son the driving method drive waveforms embodiment that proposes of the present invention.
Embodiment
Accompanying drawing is specific embodiments of the invention.
Below in conjunction with accompanying drawing content of the present invention is elaborated.
With reference to shown in Figure 1, be ferroelectric thin film electronics emission principle in the ferroelectric flat panel display display unit.Before the addressing, the polarised direction of display unit ferroelectric thin film 150 is downward., luminous during addressing if display unit needs according to video data, then between addressing electrode 140 and scan electrode 160, apply addressing voltage, make ferroelectric thin film 150 polarised directions reverse; If do not need luminously, then do not apply addressing voltage, polarised direction is constant.During demonstration, applying the forward polarizing voltage makes ferroelectric thin film 150 polarised directions after the addressing reverse once more, electronics can be ejected in ferroelectric thin film 150 tops in the hole of addressing grid electrode 140, electronics is accelerated under the effect of ito anode voltage, and the impact fluorescence powder is luminous.For not needing luminous display unit, because polarised direction never changes, do not eject so do not have electronics, also just can not be luminous.
With reference to shown in Figure 2, be the present invention at the ferroelectric flat panel display electrode structural chart.Scan electrode 160 and addressing electrode 140 intersection point places 200 are a display unit.210 places, non-point of crossing are non-luminous region.3 adjacent display units 220 apply red, green, blue fluorescent powder respectively and constitute a pixel.Be manufactured with bar shaped ito anode 110 on the display screen front glass substrate, all bar shaped ito anodes all link together.
With reference to shown in Figure 3, driving method provided by the invention is divided into two son fields at least with an input picture, for example, and a N son (SF
1, SF
2... SF
N), each son field comprises an address period and a demonstration phase, operates according to the mode that addressing limit, limit shows.In the address period display screen is carried out addressing line by line, to wanting luminous unit to apply reverse polarization voltage, make must be luminous the unit in ferroelectric thin film generation reverse polarization, apply the forward polarizing voltage immediately after address period finishes and enter the demonstration phase, simultaneously adjacent next line is applied reverse polarization voltage and carry out addressing.Enter into the demonstration after date, apply the forward polarizing voltage, this voltage is opposite with the address period voltage direction, and the ferroelectric thin film polarised direction is reversed once more in the unit that is addressed, and launches the electron-beam excitation light-emitting phosphor, and the unit of addressing is then not luminous.Each son field is showing that the phase luminous intensity becomes a ratio, and for example for 8 son fields, designing each luminous ratio in son field is 1: 2: 4: 8: 16: 32: 64: 128, then 256 gray shade scales demonstrations can be realized in 8 son fields.
With reference to shown in Figure 4, be a kind of driving voltage waveform of a ferroelectric flat panel display spare driving method provided by the invention...., X
i, X
I+1, X
I+2... be addressing electrode 140 ..., Y
j, Y
J+1, Y
J+2... be scan electrode 160.Address period for each row applies an addressing voltage on Y electrode 160, for example, first a son address period applies voltage V on Y electrode 160
P1, (apply V respectively in other son address period accordingly
P2, V
P3... V
PN, V
P1＜V
P2＜V
P3...＜V
PN), the row of addressing does not apply voltage V
P0In each row address period, apply addressing voltage V simultaneously to wanting luminous unit X electrode 140 in this journey
A1, non-luminous unit applies voltage V
A0(V
A1＜V
A0), in the unit that then is addressed on the ferroelectric thin film polarised direction with selected cell is not opposite.After all row addressing finished, X electrode 140 applied voltage V
A0After each row address period finishes, apply forward polarizing voltage V immediately
P0Enter the demonstration phase, next line enters into address period simultaneously.Address period in each son field is added in the addressing voltage difference on the Y electrode 160, and the unit that is addressed forms polarization in various degree, the electric current difference that ferroelectric thin film is launched in the demonstration phase is addressed the unit, the visible light of generation varying strength.The luminous intensity of each son field forms certain proportionate relationship, and for example for 8 son fields, luminous intensity formation ratio is 1: 2: 4: 8: 16: 32: 64: 128, can realize that then 256 grade gray scales show.Pass among Fig. 4 between each driving voltage is V
P0＜V
A1＜V
A0＜V
P1＜V
P2＜V
P3...＜V
PN
With reference to shown in Figure 5, realize the driving voltage waveform of the ferroelectric flat panel display driving method that the present invention proposes for another kind.The addressing mode of drive waveforms shown in Figure 5 and drive waveforms shown in Figure 4, display mode and realization gray scale display mode are identical.Difference is: in a different son address period, the addressing voltage that is applied on the X electrode 140 is different, is respectively V
A1, V
A2, V
A3... V
AnAddress period in each son field, it is all different to apply voltage on X electrode 140, the Y electrode 160, the reverse polarization voltage difference that on the display unit ferroelectric thin film, forms, thus luminous at a different sons demonstration phases generation varying strength.The luminous intensity of each son field forms certain proportionate relationship, and for example for 8 son fields, luminous intensity formation ratio is 1: 2: 4: 8: 16: 32: 64: 128, can realize that then 256 grade gray scales show.Pass among Fig. 5 between each driving voltage is
V
P0＜V
aN...＜V
a2＜V
a1＜V
a0＜V
p1＜V
p2＜V
p3...＜V
pN。
With reference to shown in Figure 6, the driving voltage waveform of a ferroelectric flat panel display driving method that proposes for a kind of the present invention.The addressing mode of drive waveforms shown in Figure 6 and drive waveforms shown in Figure 4, display mode and realization gray scale display mode are identical.Difference is: in a different son address period, the voltage that is applied on the Y electrode 160 is identical, during addressing delegation, applies voltage V
P1, addressing finishes after-applied voltage V
P0, the row of not addressing applies voltage V
P0In a different son address period, the addressing voltage that is applied on the X electrode 140 is different, is respectively V
A1, V
A2, V
A3... V
ANAddress period in each son field, it is all different to apply voltage on the X electrode 140, the reverse polarization voltage difference that in the display unit ferroelectric thin film, forms, thus produce the varying strength visible light.The luminous intensity of each son field forms certain proportionate relationship, and for example for 8 son fields, luminous intensity formation ratio is 1: 2: 4: 8: 16: 32: 64: 128, can realize that then 256 grade gray scales show.Pass among Fig. 6 between each driving voltage is V
P0＜V
AN...＜V
A2＜V
A1＜V
A0＜V
P1
With reference to shown in Figure 7, realize the driving voltage waveform of the ferroelectric flat panel display driving method that the present invention proposes for another kind.Compare with drive waveforms shown in Figure 4, it is identical to be applied to addressing electrode 140 drive waveforms, and difference is the drive waveforms on the scan electrode 160: at address period voltage V
P1, V
P2, V
P3... V
PNWith demonstration phase voltage V
P0Between increase an intermediate state voltage V
d(V
dGenerally can be made as no-voltage), when Y electrode 160 applies voltage V
dThe time, display unit is neither in addressed state, also not at show state; When delegation's addressing finishes after-applied voltage V
d, apply voltage V simultaneously after all row addressing finish
P0It is luminous to enter into the demonstration phase, and the demonstration phase finishes all row of back and applies voltage V
d, wait for the arrival of next height field address period.Address period at each son is added in the addressing voltage difference on the Y electrode 160, and the unit that is addressed forms polarization in various degree, in the demonstration phase strength of current difference that the unit ferroelectric thin film launches that is addressed, produces the visible light of varying strength.The luminous intensity of each son field forms certain proportionate relationship, and for example for 8 son fields, luminous intensity formation ratio is 1: 2: 4: 8: 16: 32: 64: 128, can realize that then 256 grade gray scales show.
Driving method provided by the invention can realize that the immediate addressing of ferroelectric flat panel display and gray scale show.Each display unit all is made up of scan electrode (Y electrode) 160, addressing electrode (X electrode) 140 and the ito anode 110 of quadrature.When voltage on the scan electrode 160 is higher than addressing electrode 140 voltages (reverse polarization voltage), ferroelectric thin film 150 carries out reverse polarization in the display unit, when voltage on the scan electrode 160 is lower than addressing electrode 140 voltages (forward polarizing voltage), ferroelectric thin film 150 carries out the forward polarization in the display unit.The driving method that the present invention proposes is divided into several height field with an input picture and shows.Each son field comprises an address period and a demonstration phase, carries out addressing in address period by addressing mode line by line, and the intact delegation of addressing just shows delegation, is the working method that addressing limit, a kind of limit shows.When being addressed to certain delegation, want luminous unit apply addressing voltage (reverse polarization voltage) to this row, make must be luminous the unit in ferroelectric thin film 150 carry out reverse polarization, utilize the memory function of ferroelectric thin film 150 to realize the addressing of display unit; After delegation's addressing is intact, applies the forward polarizing voltage immediately and enter the demonstration phase, simultaneously next line is applied reverse polarization voltage and carry out addressing.Showing interimly, utilizing the memory function of ferroelectric thin film 150 and polarization to turn to the transmitter electronics reason, the unit that is addressed (unit of reverse polarization) launches electron beam after applying the forward polarizing voltage, not the unit of addressing divergent bundle not then.Ito anode 110 applies a direct current high voltage all the time, and it is luminous to launch electron beam impact fluorescence powder after ito anode 110 voltages quicken from display unit.
Address period in each height field, by applying different addressing voltage (reverse polarization voltage), make the reverse polarization of the ferroelectric thin film formation varying strength of the unit that is addressed in each son field, showing the electron beam of launching different strength of current under the phase forward polarizing voltage effect subsequently, thereby the impact fluorescence powder sends the visible light of varying strength.The luminous intensity of each height field is made up by a certain percentage, can show at the image of realizing high gray shade scale, for example, for N son field, if the intensity of giving out light of each height field then can realize 2 by binary coding
NIndividual gray shade scale.
Claims (6)
1, a kind of driving method of ferroelectric flat panel display is characterized in that: an input picture is divided into two son fields at least shows that each son field comprises an address period and a demonstration phase; Carry out addressing in address period by addressing mode line by line, the intact delegation of addressing just shows delegation, during addressing delegation, wanting luminous unit to apply addressing voltage to this row is reverse polarization voltage, make must be luminous the unit in ferroelectric thin film carry out reverse polarization, utilize the memory function of ferroelectric thin film to realize the addressing of display unit; After delegation's addressing is intact, apply the forward polarizing voltage immediately and enter the demonstration phase, simultaneously next line is applied reverse polarization voltage and carry out addressing, interim in demonstration, the unit that is addressed is that electron beam is launched in the unit of reverse polarization after applying the forward polarizing voltage, and the impact fluorescence powder is luminous after ito anode voltage quickens;
Address period in each height field, by applying the addressing voltage that varies in size is reverse polarization voltage, make the reverse polarization of the ferroelectric thin film formation varying strength of the unit that is addressed in each son field, showing the electron beam of launching different strength of current under the phase forward polarizing voltage effect subsequently, thereby the impact fluorescence powder sends the visible light of varying strength, each height field is made up in the luminous intensity ratio, can realize that the image of high gray shade scale shows.
2, the driving method of ferroelectric flat panel display according to claim 1 is characterized in that, in the address period, when the voltage on the scan electrode Y electrode is higher than voltage on the addressing electrode X electrode, ferroelectric thin film in the display unit is carried out reverse polarization.
3, the driving method of ferroelectric flat panel display according to claim 1, it is characterized in that, interim in demonstration, when the voltage on the scan electrode Y electrode was lower than voltage on the addressing electrode X electrode, it was that electron beam is launched in the unit of reverse polarization after applying the forward polarizing voltage that ferroelectric thin film in the display unit is carried out unit that the forward polarization is addressed.
4, ferroelectric flat panel display driving method according to claim 1, it is characterized in that, in the demonstration phase, the forward polarizing voltage that all display units apply is identical, make at the unit emitting electrons excitated fluorescent powder that address period was addressed luminously, then the emitting electrons excitated fluorescent powder is not luminous in the unit of addressing.
5, ferroelectric flat panel display driving method according to claim 1 is characterized in that, the driving voltage that is used on addressing electrode and the scan electrode at 10V between the 100V.
6, ferroelectric flat panel display driving method according to claim 1 is characterized in that, ito anode applies a direct current high voltage all the time, and the magnitude of voltage of dc high voltage is between 300V-3000V.
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| CNB2005100419853A CN100351877C (en) | 2005-04-21 | 2005-04-21 | Method for driving ferroelectric panel display device |
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| CN100351877C true CN100351877C (en) | 2007-11-28 |
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| CN1149921A (en) * | 1994-04-11 | 1997-05-14 | 英国国防部 | Ferroelectric liquid crystal displays with greyscale |
| GB2312542A (en) * | 1995-12-21 | 1997-10-29 | Secr Defence | Multiplex addressing of ferroelectric liquid crystal diplays |
| CN1272951A (en) * | 1998-06-09 | 2000-11-08 | 塞姆特里克斯公司 | Ferroelectric flat panel display |
| US6329972B1 (en) * | 1998-06-09 | 2001-12-11 | Samsung Sdi Co., Ltd. | Method for driving antiferroelectric liquid crystal display |
| KR20040017556A (en) * | 2002-08-22 | 2004-02-27 | 엘지전자 주식회사 | Plasma display panel and driving method thereof |
| JP2004144915A (en) * | 2002-10-23 | 2004-05-20 | Mitsubishi Gas Chem Co Inc | Method for driving antiferroelectric liquid crystal element |
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2005
- 2005-04-21 CN CNB2005100419853A patent/CN100351877C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1149921A (en) * | 1994-04-11 | 1997-05-14 | 英国国防部 | Ferroelectric liquid crystal displays with greyscale |
| GB2312542A (en) * | 1995-12-21 | 1997-10-29 | Secr Defence | Multiplex addressing of ferroelectric liquid crystal diplays |
| CN1272951A (en) * | 1998-06-09 | 2000-11-08 | 塞姆特里克斯公司 | Ferroelectric flat panel display |
| US6329972B1 (en) * | 1998-06-09 | 2001-12-11 | Samsung Sdi Co., Ltd. | Method for driving antiferroelectric liquid crystal display |
| KR20040017556A (en) * | 2002-08-22 | 2004-02-27 | 엘지전자 주식회사 | Plasma display panel and driving method thereof |
| JP2004144915A (en) * | 2002-10-23 | 2004-05-20 | Mitsubishi Gas Chem Co Inc | Method for driving antiferroelectric liquid crystal element |
Non-Patent Citations (2)
| Title |
|---|
| 掺镧的锆钛酸铅透明陶瓷材料在平板显示器上的应用 解庆红，黄文旵，贺蕴秋.玻璃与搪瓷，第28卷第6期 2000 * |
| 铁电陶瓷材料在平板显示技术中的应用 林健，黄文旵.光电子技术，第21卷第4期 2001 * |
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