CN101362950A - Storage LCD material and storage type LCD projector equipment using said material - Google Patents
Storage LCD material and storage type LCD projector equipment using said material Download PDFInfo
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- CN101362950A CN101362950A CNA2008101988018A CN200810198801A CN101362950A CN 101362950 A CN101362950 A CN 101362950A CN A2008101988018 A CNA2008101988018 A CN A2008101988018A CN 200810198801 A CN200810198801 A CN 200810198801A CN 101362950 A CN101362950 A CN 101362950A
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Abstract
The invention discloses a storage liquid crystal material; the main material of the storage liquid crystal material is liquid crystal 5CB; the storage liquid crystal material is characterized in that copper porphyrin is added into the liquid crystal 5CB; the weight percentage of the mixed consistency is ranging from 0.5-1.0%; the invention also discloses a storage typed liquid crystal projection device which uses the storage liquid crystal material and comprises a TN liquid crystal box where the storage liquid crystal material is built-in; by using an optical system, the TN liquid crystal box can record the information of electric signals under the induction of recording light; furthermore, the TN liquid crystal box can realize the storage, deleting and regeneration of information; the storage typed liquid crystal projection device has high storage density, fast response speed, can quickly carry out the operations of recording and deleting, and is especially suitable for the sites of projection instructions, electric blackboards, billboard, etc.
Description
Technical field
The present invention relates to information technique for displaying field, specifically is a kind of storage-type liquid crystal projecting of storing liquid crystal material and using this material.
Technical background
Photoelectron technology is 21 century one of the most promising new branch of science, and its growth momentum is very swift and violent.Technique of display has obtained very extensive studies and application as the part of photoelectron technology.Liquid-crystal display (LCD) is a most rising present technique of display, be widely used in above family and projection TV, computer, instrument, the billboard etc., because it is in light weight, size thin, low in energy consumption, radiationless, therefore obtain people's favor, relevant technology and patent also emerge in an endless stream.The premium properties of liquid-crystal display derives from the property of liquid crystal material: liquid crystal is the intermediate phase that is between crystal and the liquid, both had crystalline anisotropy and periodic structure, the flowability that has liquid again, the liquid crystal molecule deformation that can rotate under effect of electric field, produce the intensive optical non-linear effect, this is the basis of liquid-crystal display.
Though the development of LCD is very perfect at present, quality is also very good, but the pattern of its demonstration still dynamically shows: ceaselessly provide information (electrical signal) to give liquid crystal display so that show by sweep circuit, even the identical circuit that also needs of information provides same signal in procedure for displaying, otherwise just can stop to show.Therefore this display format need complicated driving circuit, high power consumption and since ceaselessly scanning make show of low quality.For overcoming these difficulties, a kind of novel static display format is just used and is given birth to, the static demonstration is meant that mainly storage-type shows, the information that needs to show is provided by circuit, but information is stored and show by liquid crystal, so just do not need circuit to repeat to provide identical information, be particularly suitable for above projection device, electronic blackboard, the billboard etc.
Main storage-type liquid-crystal display at present mainly is based on the phase transformation of pure liquid crystal under thermo-optic effect, when flashlight (focusing on about 10 microns laser beam) when shining on the liquid crystal, the liquid crystal temperature of illuminated part rises, be phase-changed into isotropic liquid from the mesomorphic phase process, in case laser beam is shifted to the elsewhere, liquid crystal temperature sharply descends, the phase transformation of appearance from the isotropic phase to the mesomorphic phase, in phase transition process, can form burnt wimble structure with scattering of light, produce opaque state, and remain to image wipe always, form the storage memory.If but when temperature descends, give extra electric field, then can get back to vitreous state, the method that the image that writes of heat can electricity consumption is wiped like this; On the other hand, recording light does not have the liquid crystal of illuminated portion to remain transparent configuration.The mode of this thermoelectric effect is controlled complexity, is used speed inconvenient, response very slow, and the density of record is lower.
Summary of the invention
The objective of the invention is to the deficiency that storage shows at available liquid crystal, a kind of storage liquid crystal material that storage shows of realizing under rayed is provided.
Another object of the present invention provides a kind of storage-type liquid crystal projecting that uses above-mentioned storage liquid crystal material.
A kind of storage liquid crystal material, its material of main part is liquid crystal 5CB, it is characterized in that mixing copper porphyrin in liquid crystal 5CB, the doping content weight percent is 0.5～1.0%.
Liquid crystal 5CB is general nematic liquid crystal, and its molecular structure is:
The molecular structure of copper porphyrin CuTPP (cuprum porphyrin) is:
Owing to can form the coupling of coordinate bond between impurity copper porphyrin and the liquid crystal 5CB, therefore mixed uniformly storage liquid crystal material is uniform solution.Because the impurity copper porphyrin of being mixed is responsive unusually to irradiates light, the storage liquid crystal material can be worked under the low light level and low voltage pulse, and can store apace and delete electrical signal.
A kind of storage-type liquid crystal projecting is characterized in that
The TN liquid crystal cell that comprises built-in above-mentioned storage liquid crystal material;
Comprise the information frame electrical signal drive unit that is used on the column electrode of liquid crystal and row electrode, applying corresponding electricimpulse;
Comprise being used to induce and store first light-source system that liquid crystal material is stored electrical signal, the emergent light of first light-source system can shine the front panel of TN liquid crystal cell equably;
Comprise the polarizer, the polarization direction of the polarizer is parallel to the orientation of the front panel of TN liquid crystal cell;
Comprise analyzer, the polarization direction of analyzer is parallel to the orientation of the rear panel of TN liquid crystal cell;
Comprise magnifying glass;
Comprise being used for the secondary light source system that liquid crystal image reproduces, the light of secondary light source system outgoing incides the front panel of TN liquid crystal cell by the polarizer, after its rear panel outgoing through projecting to display image on the screen behind analyzer, the magnifying glass.
First light-source system preferably adopts monochromatic source, and the monochromatic source optimal wavelength is the laser of 532nm.
The secondary light source system preferably adopts the three primary light source of high brightness.Further, the secondary light source system comprises collimation mechanism, and the three primary light source of high brightness impinges perpendicularly on the polarizer behind the collimation mechanism collimation.
The working order and the mechanism of storage-type liquid crystal projecting are as follows:
1, the information of the electrical signal record stage:
At first recording light (emergent light of first light-source system) is shone on the storage liquid crystal material, simultaneously apply corresponding electricimpulse on the column electrode of liquid crystal and row electrode, can show corresponding information frame this moment on liquid crystal, as shown in Figure 2.Under the effect of impurity, liquid crystal, electrical signal and recording light, the information that adds electrical signal will be stored in the doped liquid crystal the inside, and this is the recording process of electrical signal.The microscopic mechanism in this stage as shown in Figure 6, represented among the figure is some pixel (display units, the part that also refers to column electrode and row electrode crossing), excitation light irradiation is to liquid crystal layer, owing to be mixed with impurity (stain is promptly represented impurity among Fig. 6) in the liquid crystal layer, make impurity photo-generated carrier occur, if this display pixel is applied with electricimpulse, then photo-generated carrier then drifts to the surface under the effect of extra electric field, the impurity that loses the positively charged of current carrier then floats to another surface, will form surface charge on the surface of liquid crystal pixel like this; And if this pixel does not apply electric impulse signal, then photo-generated carrier can not spread, and can only be in this locality compoundly falls, and does not just have surface charge yet.Therefore the surface charge of pixel has been represented the information of corresponding electricimpulse, and the quantity of surface charge is corresponding to the intensity that adds electricimpulse.Form electric charge owing to the current carrier near the surface can float to the surface rapidly, so the Time Created in this stage is very short, can carries out record short electrical impulse information.Experimental result shows writing time of electrical signal of view picture frame at 30 milliseconds to 50 milliseconds, and its occurrence depends on the voltage amplitude of record light intensity and electrical signal.
2, the information storage stage of electrical signal:
As shown in Figure 3, add electricimpulse and be undone, at this moment, each liquid crystal pixel is in different states, though do not have impressed voltage this moment, its surface still exists surface charge, forms internal electric field, make and liquid crystal molecule generation deformation variations in refractive index occurs, as shown in Figure 7.Its change of refractive whether, to change size corresponding with its surperficial amount of charge, and just to write down the electrical impulse information in stage corresponding with the information that was in originally.Although therefore do not add electrical signal in this stage, the information of original electrical signal is still preserved, so this stage can be called the memory phase of information.Certainly because the electric charge on surface can be progressively compound, cause surface charge to reduce, electric field progressively disappears, and final information can disappear.According to experimental result, its information storage for up to 5 minutes.
3, the information regeneration of electrical signal and demonstration stage:
As shown in Figure 4, use playback light, need not apply electricimpulse (this is the characteristics of native system, and the doped liquid crystal of other types must apply electric field always in work), then enter information regeneration and demonstration stage.Since the deformation difference of the liquid crystal of each display pixel, and deformation is corresponding with the electric impulse signal in information record stage, each pixel of whole like this doped liquid crystal can be modulated playback light, thus reproduced image.In addition, experimental result shows that the quality of electrical signal storage is very good, after information storage for some time in (being about 5 minutes), the picture quality of reproduction is very high always very stable, picture quality decays rapidly then; Though and existing material is very long some storage time, the exponential attenuation of storage signal can appear in the process of reappearing, that is to say that again picture quality, can't stabilized presentation along with the elongated rapid variation of time.
4, the information deletion stage of electrical signal:
As shown in Figure 5, with the row-column electrode short circuit of liquid-crystal display, then the electric charge on surface can be caused the liquid crystal internal electric field to disappear by " neutralization ", and liquid crystal molecule is return the primary state.Therefore this stage is the information deletion stage, and experimental result shows that the time of deletion is about 50 milliseconds.
The present invention utilizes the electrooptic effect of storage liquid crystal material to realize that static storage-type shows, storage density improves greatly than prior art, can work under the low light level and low voltage pulse, and response speed is fast, can store apace and delete, and control simple, easy to use.
Description of drawings
Fig. 1 is the structural representation of storage-type liquid crystal projecting.
Fig. 2 is that liquid crystal display is in the information synoptic diagram in record stage.
Fig. 3 is the synoptic diagram that liquid crystal display is in the information storage stage.
Fig. 4 is the synoptic diagram that liquid crystal display is in information regeneration and demonstration stage.
Fig. 5 is the synoptic diagram that liquid crystal display is in the information deletion stage.
Fig. 6 is one of internal mechanism synoptic diagram of storage demonstration.
Fig. 7 is two of the internal mechanism synoptic diagram that shows of storage.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Embodiment 1
The structural representation of storage-type liquid crystal projecting as shown in Figure 1, it is the laser of 532nm that first light-source system 1 adopts wavelength, intensity is the 100mW magnitude, and through being radiated at the surface of whole TN liquid crystal cell 5 behind the expansion bundle equably, the emergent light of first light-source system is also referred to as recording light.Secondary light source system 2 adopts the three primary light source of high brightness, impinges perpendicularly on the polarizer 3 behind the collimation mechanism collimation, and the emergent light of secondary light source system is also referred to as playback light.The orientation of the front and back panels of TN liquid crystal cell 5 is vertical, box is thick is 9um, and surface size is 1cm*1cm, is carved with the electrode and the lead-in wire of dot matrix.The twist angle of the liquid crystal molecule 4 that TN liquid crystal cell 5 is built-in is 90 degree, and the polarization direction of the polarizer 3 is parallel to the orientation of the front panel of TN liquid crystal cell 5; The polarization direction of analyzer 6 is parallel to the orientation of the rear panel of TN liquid crystal cell 5; Project to display image on the screen 9 behind the light process analyzer 6 of the rear panel of process TN liquid crystal cell 5, the magnifying glass 7.The effect of information frame electrical signal drive unit 8 is that the information frame with display image is transformed into electrical signal and is loaded on the TN liquid crystal cell 5 when recording light is shone, and realizes the storage of signal.
Pure liquid crystal 5CB of nematic and impurity copper porphyrin are mixed equably, and doping content weight percent 0.5%.Owing to can form the coupling of coordinate bond between impurity and the liquid crystal, so doped system is uniform solution.Doped liquid crystal is poured into the TN liquid crystal cell, obtain the storage-type liquid-crystal display.
Utilize recording light to induce the storage of doped liquid crystal, utilize playback light to realize the demonstration of store electricity signal again electrical signal.When need store to the electrical signal of entire frame, only need on electrod-array, add power on signal, simultaneously recording light is shone on the liquid crystal just passable; Adopt playback light to shine above the liquid crystal then, the information that is stored in the electrical signal on the liquid crystal will be modulated this light, and projecting to behind the light process magnifying glass expansion bundle that transmits then promptly can display image on the giant-screen.
In the present embodiment, storing the required time of a two field picture is 30ms; Information storage for up to 5min; The time of information deletion is 50ms.
Compare with embodiment 1, different is the doping content weight percent 0.7% of storage liquid crystal material, and experimental result shows that in the present embodiment, storing the required time of a two field picture is 30ms; Information storage for up to 5.5min; The time of information deletion is 50ms.
Compare with embodiment 1, different is the doping content weight percent 1% of storage liquid crystal material, and experimental result shows that in the present embodiment, storing the required time of a two field picture is 30ms; Information storage for up to 5.5min; The time of information deletion is 50ms.
By embodiment 1～3 as seen, doping content does not have too much influence to the time of record, storage, deletion, but concentration has very big influence to the quality of storing, and that is to say under the concentration ratio condition with higher, the strength of signal height of reproduction, and the quality of image is good.Yet, when the doping content weight percent of storage liquid crystal material surpasses 1%, influence picture quality thereby occur precipitation easily.
Claims (6)
1, a kind of storage liquid crystal material, its material of main part is liquid crystal 5CB, it is characterized in that mixing copper porphyrin in liquid crystal 5CB, the doping content weight percent is 0.5～1.0%.
2, a kind of storage-type liquid crystal projecting is characterized in that
The TN liquid crystal cell that comprises the described storage liquid crystal material of built-in claim 1;
Comprise the information frame electrical signal drive unit that is used on the column electrode of liquid crystal and row electrode, applying corresponding electricimpulse;
Comprise being used to induce and store first light-source system that liquid crystal material is stored electrical signal, the emergent light of first light-source system can shine the front panel of TN liquid crystal cell equably;
Comprise the polarizer, the polarization direction of the polarizer is parallel to the orientation of the front panel of TN liquid crystal cell;
Comprise analyzer, the polarization direction of analyzer is parallel to the orientation of the rear panel of TN liquid crystal cell;
Comprise magnifying glass;
Comprise being used for the secondary light source system that liquid crystal image reproduces, the light of secondary light source system outgoing incides the front panel of TN liquid crystal cell by the polarizer, after its rear panel outgoing through projecting to display image on the screen behind analyzer, the magnifying glass.
3, storage-type liquid crystal projecting according to claim 2 is characterized in that first light-source system adopts monochromatic source.
4, storage-type liquid crystal projecting according to claim 3 is characterized in that described monochromatic source is that wavelength is the laser of 532nm.
5, storage-type liquid crystal projecting according to claim 2 is characterized in that the secondary light source system adopts the three primary light source of high brightness.
6, storage-type liquid crystal projecting according to claim 5 is characterized in that the secondary light source system comprises collimation mechanism, and the three primary light source of high brightness impinges perpendicularly on the polarizer behind the collimation mechanism collimation.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101988018A CN101362950A (en) | 2008-09-26 | 2008-09-26 | Storage LCD material and storage type LCD projector equipment using said material |
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| CNA2008101988018A CN101362950A (en) | 2008-09-26 | 2008-09-26 | Storage LCD material and storage type LCD projector equipment using said material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412785A (en) * | 2018-04-26 | 2019-11-05 | 精工爱普生株式会社 | Electro-optical device, projection type image display apparatus |
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- 2008-09-26 CN CNA2008101988018A patent/CN101362950A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412785A (en) * | 2018-04-26 | 2019-11-05 | 精工爱普生株式会社 | Electro-optical device, projection type image display apparatus |
| CN110412785B (en) * | 2018-04-26 | 2022-03-01 | 精工爱普生株式会社 | Electro-optical device and projection display device |
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Open date: 20090211 |