CN102081263A - Reflection-type liquid crystal display (LCD) and manufacturing method thereof - Google Patents
Reflection-type liquid crystal display (LCD) and manufacturing method thereof Download PDFInfo
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- CN102081263A CN102081263A CN2011100512260A CN201110051226A CN102081263A CN 102081263 A CN102081263 A CN 102081263A CN 2011100512260 A CN2011100512260 A CN 2011100512260A CN 201110051226 A CN201110051226 A CN 201110051226A CN 102081263 A CN102081263 A CN 102081263A
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Abstract
The invention discloses a reflection-type liquid crystal display (LCD) which comprises a first substrate, a second substrate, a liquid crystal layer, a first alignment layer and a second alignment layer, wherein the first substrate and the second substrate are arranged face to face; the liquid crystal layer is arranged between the first substrate and the second substrate; the liquid crystal layer comprises a plurality of liquid crystal molecules and is used for the reflection of lights of partial wavelengths and the transmission of lights of partial wavelengths; and the second alignment layer is arranged at one inner side, facing to the secondary substrate, the first substrate, and is used for absorbing the rays of light passing through the liquid crystal layer and aligning the liquid crystal molecules.
Description
Technical field
The invention relates to a kind of reflective liquid-crystal display and preparation method thereof, refer to a kind of reflective liquid-crystal display and its method for making especially with black liquid crystal alignment layer.
Background technology
Therefore reflective liquid-crystal display has characteristics such as slimming, low power consumption owing to do not need module backlight that light source is provided.Wherein, cholesterol liquid crystal is because the incident light of reflecting part wavelength optionally, simultaneously has the characteristic that when not applying voltage, presents bistable state (bistable state) again, so be suitable for reflective liquid-crystal display and can further reach the effect of power saving.
Display mechanism about cholesterin liquid-crystal display please refer to Figure 1A to Fig. 1 C.Wherein, Figure 1A has illustrated reflective cholesterin liquid-crystal display in not applying the demonstration synoptic diagram that presents snail state (Planar State) under the voltage, Figure 1B has illustrated reflective cholesterin liquid-crystal display in applying the demonstration synoptic diagram that presents homeotropic alignment state (Homeotropic State) under the voltage, and Fig. 1 C has illustrated reflective cholesterin liquid-crystal display in applying the demonstration synoptic diagram that presents focal conic state (Focal Conic State) after voltage shift removes.Shown in Figure 1A, a plurality of cholesteric liquid crystal molecule 14M are arranged on the substrate 301 and between first pixel electrode 161 and second pixel electrode 162.When not applying a voltage to first pixel electrode 161 and second pixel electrode 162, cholesteric liquid crystal molecule 14M presents the snail state.At this moment, cholesteric liquid crystal molecule 14M optionally the reflecting part wavelength incident light and the incident light of other parts wavelength is penetrated.Shown in Figure 1A figure, incident light C comprises incident light A and incident light B, and wherein incident light A has different wavelength coverages respectively with incident light B.Incident light A can penetrate cholesteric liquid crystal molecule 14M and form and penetrate light AT, and incident light B can be reflected by cholesteric liquid crystal molecule 14M and form reflected light BR, is therefore presented the bright attitude display effect of reflected light BR wavelength coverage.And be enough to drive cholesteric liquid crystal molecule 14M to the voltage of homeotropic alignment state during in first pixel electrode 161 and second pixel electrode 162 when applying, shown in Figure 1B, the voltage difference that first pixel electrode 161 and second pixel electrode are 162 can make cholesteric liquid crystal molecule 14M present the homeotropic alignment state, and incident light C can penetrate cholesteric liquid crystal molecule 14M fully and formed and penetrate light CT and present dark attitude effect this moment.Then, after putting on voltage on first pixel electrode 161 and second pixel electrode 162 and being removed, shown in Fig. 1 C, cholesteric liquid crystal molecule 14M will present focal conic state.At this moment, incident light C will be formed scattered light CD by cholesteric liquid crystal molecule 14M scattering, makes display keep dark attitude effect.Yet, in this reflective cholesterin liquid-crystal display, if substrate 301 can produce reflecting effect to light, for example substrate 301 is one when having the array base palte of metal pattern, shown in Figure 1A to Fig. 1 C, pass penetrating light AT, penetrating light CT and scattered light CD and will be reflected by substrate 301 and form reflected light AR, reflected light CR and reflected light DR respectively of cholesteric liquid crystal molecule 14M.Wherein, under different display modes, reflected light BR caused the not good problem of excitation when reflected light AR can have influence on original bright attitude.Reflected light CR and reflected light DR then can cause dark attitude light leak, and then produce the problem that contrast descends.
Therefore, in known reflective cholesterin liquid-crystal display, generally can form in the surface of substrate a black absorption layer absorb penetrated cholesterol liquid crystal penetrate light and scattered light to reduce influence to color saturation and contrast.Yet, outside this, also need consider can not be covered by the black absorption layer fully the group demand because of follow-up in zone, substrate top.Therefore, in known technology, except the step that the black absorption layer forms, also need extra fabrication steps that part black absorption layer is removed, so cause the process complexity of reflective cholesterin liquid-crystal display integral body to increase, and then cost and yield all had adverse influence.
Summary of the invention
One of fundamental purpose of the present invention is to provide a kind of reflective liquid-crystal display and preparation method thereof, absorbs with the black liquid crystal alignment layer to penetrate light to improve color saturation when, reaches the purpose of simplifying processing procedure simultaneously.
A preferred embodiment of the present invention provides a kind of reflective liquid-crystal display.Above-mentioned reflective liquid-crystal display comprises one first substrate, one second substrate, a liquid crystal layer, one first both alignment layers and one second both alignment layers.First substrate and second substrate are to be oppositely arranged, and liquid crystal layer is arranged between first substrate and second substrate.Liquid crystal layer comprises a plurality of liquid crystal molecules, and liquid crystal molecule is to use so that the light transmission that the long light of subwave reflects and makes the part wavelength.First both alignment layers is to be arranged at the inboard of second real estate to first substrate, and first both alignment layers has the ability to liquid crystal alignment.Second both alignment layers is to be arranged at the inboard of first real estate to second substrate, and second both alignment layers is to carry out orientation in order to absorb through the light of liquid crystal layer and to liquid crystal molecule.
Another preferred embodiment of the present invention provides a kind of method for making of reflective liquid-crystal display, comprises the following steps.At first, provide one first substrate and one second substrate.Then, on second substrate, form one first both alignment layers, and on first substrate, form one second both alignment layers.Then, in between first both alignment layers and second both alignment layers, form a liquid crystal layer, wherein liquid crystal layer comprises a plurality of liquid crystal molecules, this liquid crystal molecule has light reflection that makes the part wavelength and the ability that makes the light transmission of other parts wavelength, and second both alignment layers has light-absorbing characteristic and to the ability of liquid crystal alignment.
The present invention utilizes the function with the black absorption layer to combine with liquid crystal alignment layer, the light that penetrates that penetrated liquid crystal layer is absorbed, with improve reflective liquid-crystal display to color saturation when, save the fabrication steps of extra black absorption layer simultaneously, and then reach the effect of simplifying processing procedure.
Description of drawings
Figure 1A to Fig. 1 C has illustrated the show state synoptic diagram of known reflective cholesterin liquid-crystal display.
Fig. 2 has illustrated the diagrammatic cross-section of the reflective liquid-crystal display of a preferred embodiment of the present invention.
Fig. 3 A to Fig. 3 C has illustrated the show state synoptic diagram of the reflective liquid-crystal display of a preferred embodiment of the present invention.
Fig. 4 has illustrated the method synoptic diagram of the making reflective liquid-crystal display of another preferred embodiment of the present invention.
Embodiment
In the middle of this instructions and aforesaid claim scope, used some vocabulary to censure specific assembly.The person with usual knowledge in their respective areas should understand, and the producer may call same assembly with different nouns.This instructions and aforesaid claim scope are not used as distinguishing the mode of assembly with the difference of title, but the benchmark that is used as distinguishing with the difference of assembly on function.Be an open term mentioned " comprising " in the middle of instructions and the aforesaid claim in the whole text, so should be construed to " including but not limited to ".Moreover, can further understand the present invention for making the general skill person who has the knack of the technical field of the invention, hereinafter the spy enumerates several preferred embodiments of the present invention, and cooperates appended graphicly, describes constitution content of the present invention in detail.Be noted that graphic only for the purpose of description, do not map according to life size.In addition, for example use in the text " first " with " second " wait narration, only in order to distinguish different assemblies, not to its generation restriction in proper order.
Please refer to Fig. 2.Fig. 2 has illustrated the diagrammatic cross-section of the reflective liquid-crystal display of a preferred embodiment of the present invention.As shown in Figure 2, reflective liquid-crystal display 51 of the present invention comprises one first substrate 101, one second substrate 102, a liquid crystal layer 13, one first both alignment layers 12 and one second both alignment layers 11.Wherein first substrate 101 and second substrate 102 are to be oppositely arranged, and liquid crystal layer 13 is arranged between first substrate 101 and second substrate 102.Liquid crystal layer 13 comprises a plurality of liquid crystal molecule 13M, and liquid crystal molecule 13M has light reflection that optionally makes the part wavelength and the ability that makes the light transmission of other parts wavelength.In the present embodiment, liquid crystal molecule 13M comprises cholesteric liquid crystal molecule or other liquid crystal molecule kind with reflectivity properties that is fit to.First both alignment layers 12 is to be arranged at the inboard of second substrate 102 in the face of first substrate 101, and first both alignment layers 12 has the ability of liquid crystal molecule 13M being carried out orientation.Second both alignment layers 11 is to be arranged at the inboard of first substrate 101 in the face of second substrate 102, and second both alignment layers 11 has optical absorption characteristics simultaneously and to the ability of liquid crystal molecule 13M orientation.In addition, the reflective liquid-crystal display 51 of present embodiment can more comprise a plurality of first pixel electrodes 151 and a plurality of second pixel electrodes 152.Wherein, first pixel electrode 151 is to be arranged between first substrate 101 and second both alignment layers 11, and second pixel electrode 152 is to be arranged between second substrate 102 and first both alignment layers 12.First pixel electrode 151 is to be used for driving liquid crystal molecule 13M to reach different display effects to change its ordered state with second pixel electrode 152.In the present embodiment, first substrate 101 comprises that array basal plate (Array Substrate) or other substrate that is fit to are to control liquid crystal molecule 13M regionally, to reach different display effects.
Then please refer to Fig. 3 A to Fig. 3 C, Fig. 3 A to Fig. 3 C has illustrated the show state synoptic diagram of the reflective liquid-crystal display of a preferred embodiment of the present invention.Wherein Fig. 3 A has illustrated the demonstration synoptic diagram of liquid crystal molecule 13M in the snail state, and Fig. 3 B has illustrated the demonstration synoptic diagram of liquid crystal molecule 13M in the homeotropic alignment state, and Fig. 3 C has illustrated the demonstration synoptic diagram of liquid crystal molecule 13M in focal conic state.Shown in Fig. 3 A to Fig. 3 C, second both alignment layers 11 is to be arranged between first pixel electrode 151 and the liquid crystal molecule 13M.When not applying a voltage to first pixel electrode 151 and second pixel electrode 152, liquid crystal molecule 13M presents the snail state.At this moment, liquid crystal molecule 13M optionally the reflecting part wavelength incident light and the incident light of other parts wavelength is penetrated.As shown in Figure 3A, incident light C comprises incident light A and incident light B, and the wavelength coverage of incident light A and incident light B is also inequality.Incident light A can penetrate liquid crystal molecule 13M and form and penetrate light AT, and incident light B can be reflected by liquid crystal molecule 13M and form reflected light BR to reach the bright attitude effect of demonstration.In the present invention, can be by the characteristic that changes liquid crystal molecule, optionally the light with different wavelength range reflects, and reaches the display effect of expection.For instance, if liquid crystal molecule can form catoptrical wavelength coverage between 620 how rice can will be positioned at the light reflection of above-mentioned wavelength coverage and allow light source outside the above-mentioned wavelength coverage to penetrate and reach the display effect of ruddiness to 750 how between the rice time.If liquid crystal molecule 13M can form catoptrical wavelength coverage between 495 how rice can will be positioned at the light reflection of above-mentioned wavelength coverage and allow light source outside the above-mentioned wavelength coverage to penetrate and reach the display effect of green glow to 570 how between the rice time.If liquid crystal molecule can form catoptrical wavelength coverage between 450 how rice can will be positioned at the light reflection of above-mentioned wavelength coverage and allow light source outside the above-mentioned wavelength coverage to penetrate and reach the display effect of blue light to 495 how between the rice time.In the present embodiment, as shown in Figure 3A, penetrating light AT can be absorbed by second both alignment layers 11, and the reflected light that can not form other has influence on the predetermined effect that need present of reflected light BR.In addition, shown in Fig. 3 B, when applying a voltage to first pixel electrode 151 and second pixel electrode 152, the voltage difference that first pixel electrode 151 and second pixel electrode are 152 can make liquid crystal molecule 13M present the homeotropic alignment state, and incident light C can penetrate liquid crystal molecule 13M and formed and penetrate light CT and present dark attitude effect this moment.In the present embodiment, penetrating light CT can be absorbed by second both alignment layers 11, and can not form the display effect that reflected light influences dark attitude.Then, after putting on voltage on first pixel electrode 151 and second pixel electrode 152 and being removed, shown in Fig. 3 C, liquid crystal molecule 13M will present focal conic state.At this moment, incident light C will be formed scattered light CD by liquid crystal molecule 13M scattering, and keeps the display effect of dark attitude.In addition, in the present embodiment, the material of second both alignment layers 11 is to add black dyes or other low reflective material that is fit to mixes in the LCD alignment material.How this black dyes comprises dichromatism black dyes or other micromolecule black dyes that is fit to of rice particle grades.Simultaneously, the preferred concentration that this black dyes makes an addition in second both alignment layers 11 is between 1% to 10%, be unlikely to too high to control this concentration to the orientation effect that influences 11 couples of liquid crystal molecule 13M of second both alignment layers, and make optical concentration (the Optical Density of second both alignment layers 11 simultaneously, the OD value) is promoted to more than 2.5, penetrate light and scattered light to absorb effectively, reach the effect that promotes color saturation and contrast.What deserves to be explained is that black dyes makes an addition to concentration in second both alignment layers 11 and the optical concentration of second both alignment layers 11 does not exceed with above-mentioned numerical value.
Then please refer to Fig. 4.Fig. 4 has illustrated the method synoptic diagram of the making reflective liquid-crystal display of another preferred embodiment of the present invention.As shown in Figure 4, the method for making of the reflective liquid-crystal display 52 of another preferred embodiment of the present invention comprises following several steps.At first, provide one first substrate 201 and one second substrate 202.Then, on second substrate 202, form one first both alignment layers 22, and on first substrate 201, form one second both alignment layers 21.Then, between first both alignment layers 22 and second both alignment layers 21, form a liquid crystal layer 23, wherein liquid crystal layer 23 comprises a plurality of liquid crystal molecule 23M, liquid crystal molecule 23M has light reflection that optionally makes the part wavelength and the ability that makes the light transmission of other parts wavelength, and second both alignment layers 21 has light-absorbing characteristic and to the ability of liquid crystal molecule 23M orientation.In the present embodiment, liquid crystal molecule 23M comprises cholesteric liquid crystal molecule or other liquid crystal molecule kind with reflectivity properties that is fit to, and the generation type of liquid crystal layer 23 comprise traditional injection method (Injection), the formula of dripping injection method (One Drop Filling, ODF) or other liquid crystal injection mode that is fit to.In addition, the preferred concentration that black dyes makes an addition in second both alignment layers 21 is between 1% to 10%, be unlikely to too high to control this concentration to the orientation effect that influences 21 couples of liquid crystal molecule 23M of second both alignment layers, and make the optical concentration of second both alignment layers 21 simultaneously greater than 2.5, penetrate light and scattered light to absorb effectively, reach the effect that promotes color saturation and contrast.In addition, it should be noted that, black absorption layer production method compared to known reflective liquid-crystal display needs extra gold-tinted etch process to reach the purpose of patterning, in the present invention, the mode that second both alignment layers 21 forms can be utilized for example transfer printing, by transfer plate synchronous effect that produces patterning when being coated with second both alignment layers 21, reach the purpose that further processing procedure is simplified.
In sum, the present invention is used in and adds black dyes kind and the concentration that is fit in the liquid crystal alignment layer, make liquid crystal alignment layer have optical absorption characteristics simultaneously and to the ability of liquid crystal alignment, with will penetrate effectively liquid crystal layer in the reflective liquid-crystal display penetrate light and scattered light absorbs, reach improve reflective liquid-crystal display to the effect of color saturation when.Simultaneously, black liquid crystal alignment layer design of the present invention can be saved the fabrication steps of extra black absorption layer, and then reaches the effect that processing procedure is simplified, cost reduces and yield promotes.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a reflective liquid-crystal display is characterized in that, comprising:
One first substrate;
One second substrate is oppositely arranged with this first substrate;
One liquid crystal layer comprises a plurality of liquid crystal molecules, is arranged between this first substrate and this second substrate, uses so that the light transmission that the long light of subwave reflects and makes the part wavelength;
One first both alignment layers is arranged at the inboard of this second real estate to this first substrate, and wherein this first both alignment layers has the ability to these liquid crystal alignments; And
One second both alignment layers is arranged at the inboard of this first real estate to this second substrate, in order to absorb through the light of this liquid crystal layer and to these liquid crystal alignments.
2. reflective liquid-crystal display as claimed in claim 1 is characterized in that these liquid crystal molecules comprise cholesteric liquid crystal molecule.
3. reflective liquid-crystal display as claimed in claim 1 is characterized in that the optical concentration of this second both alignment layers is greater than 2.5.
4. reflective liquid-crystal display as claimed in claim 1 is characterized in that the composition of this second both alignment layers comprises black dyes, and this black dyes is between 1% to 10% in the concentration of this second both alignment layers.
5. reflective liquid-crystal display as claimed in claim 4 is characterized in that this black dyes comprises the dichromatism black dyes.
6. reflective liquid-crystal display as claimed in claim 1 is characterized in that, this first substrate comprises array basal plate.
7. the method for making of a reflective liquid-crystal display is characterized in that, comprising:
One first substrate and one second substrate are provided;
On this second substrate, form one first both alignment layers;
On this first substrate, form one second both alignment layers; And
Between this first both alignment layers and this second both alignment layers, form a liquid crystal layer, wherein this liquid crystal layer comprises a plurality of liquid crystal molecules, these liquid crystal molecules have light reflection that makes the part wavelength and the ability that makes the light transmission of part wavelength, and this second both alignment layers has light-absorbing characteristic and to the ability of these liquid crystal alignments.
8. the method for making of reflective liquid-crystal display as claimed in claim 7 is characterized in that, these liquid crystal molecules comprise cholesteric liquid crystal molecule.
9. the method for making of reflective liquid-crystal display as claimed in claim 7 is characterized in that, the optical concentration of this second both alignment layers is greater than 2.5.
10. the method for making of reflective liquid-crystal display as claimed in claim 7 is characterized in that, the composition of this second both alignment layers comprises black dyes, and this black dyes is between 1% to 10% in the concentration of this second both alignment layers.
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Cited By (3)
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| CN105319780A (en) * | 2015-12-03 | 2016-02-10 | 武汉华星光电技术有限公司 | Glue frame curing mask and preparation method thereof |
| CN108287421A (en) * | 2016-11-23 | 2018-07-17 | 中山大学 | Transparent display |
| CN113960838A (en) * | 2020-07-20 | 2022-01-21 | 虹曜电纸技术股份有限公司 | Reflective cholesterol liquid crystal display device |
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Application publication date: 20110601 |