CN102914899A - Double-sided display device - Google Patents
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- CN102914899A CN102914899A CN2012103876564A CN201210387656A CN102914899A CN 102914899 A CN102914899 A CN 102914899A CN 2012103876564 A CN2012103876564 A CN 2012103876564A CN 201210387656 A CN201210387656 A CN 201210387656A CN 102914899 A CN102914899 A CN 102914899A
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Abstract
The invention relates to the technical field of liquid crystal display and in particular to a double-sided display device. The double-sided display device is used for realizing single-sided display, double-sided display or transparent display. The invention discloses the double-sided display device which comprises two PDLC (Polymer Dispersed Liquid Crystal) displays arranged back to back, wherein each PDLC display comprises a TFT (Thin Film Transistor) array substrate with a pixel electrode, a common electrode substrate opposite to the TFT array substrate and a PDLC layer positioned between the TFT array substrate and the common substrate as well as a toning device positioned between the two TFT array substrates; and the toning device comprises two transparent electrode layers opposite in position and a toning layer which is positioned between the two transparent electrode layers and can be switched between a transparent state and a black state. By using the characteristic that the toning device can be switched between the transparent state and the black state and the characteristic that the PDLC display can be switched between the transparent state and a scattering state, the double-sided display device has functions of single-sided display and double-sided display and a transparent display function.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly a kind of double-side display device.
Background technology
Development along with lcd technology, in the airport lounge, the message panel in railway station Waiting Lounge or large-scale exhibition center, or the message panel that uses in the business hall of the service trades such as communications industry, government's window, financial industry, transportation industry, generally all adopt double-side display device, so that the user obtains information needed.Existing double-side display device generally comprises: two themselves one-sided displays that are oppositely arranged form subsides, and each liquid crystal display is corresponding driving circuit alone, makes this double-side display device can realize the picture disply of single or double.
But, raising along with customer requirements, for example: require double-side display device when mode of operation, can realize the Presentation Function of single or double, it is transparent requiring double-side display device outside mode of operation, perhaps, to take up room in order saving, double-side display device can be installed on the window, when mode of operation, can realize the Presentation Function of single or double, when non-operating mode, can not affect the printing opacity of window; And present double-side display device does not have transparent Presentation Function.
Summary of the invention
The object of the present invention is to provide a kind of single face of both can having realized to show or double-sided display, can realize again the double-side display device of transparent demonstration.
In order to achieve the above object, the invention provides following technical scheme:
A kind of double-side display device comprises:
Two back to Polymer Dispersed Liquid Crystal (Polymer Dispersed Liquid Crystal is hereinafter to be referred as the PDLC) display that arranges; Wherein, each PDLC display comprises: thin film transistor (TFT) (the Thin Film Transistor with pixel electrode, hereinafter to be referred as TFT) array base palte, the common electrode substrate that is oppositely arranged with described tft array substrate, and between described tft array substrate and described common electrode substrate, the PDLC layer of changeable clear state and scattering states;
Regulating device between two described tft array substrates; Wherein, described regulating device comprises: two transparent electrode layers that are oppositely arranged, the color emission layer of changeable clear state and black attitude between described two transparent electrode layers.
Preferably, described PDLC layer comprises: the first polymeric matrix is arranged in the first liquid crystal molecule and the dichroic dye of described the first polymeric matrix.
Preferably, described the first liquid crystal molecule is nematic liquid crystal or smectic liquid crystal.
Display color when preferably, described PDLC layer is in scattering states.
Preferably, described two transparent electrode layers place respectively on two described tft array substrates.
Preferably, described color emission layer comprises: the second polymeric matrix is arranged in the second liquid crystal molecule and the black dyes of described the second polymeric matrix.
Preferably, described the second liquid crystal molecule is nematic liquid crystal, smectic liquid crystal or cholesteric liquid crystal.
Further, described double-side display device also comprises: respectively with described two PDLC displays be connected three driving circuits that regulating device is connected.
In double-side display device provided by the invention, regulating device has two kinds of optical states: clear state and black attitude; When regulating device is the black attitude, can be used as the substrate of two PDLC displays, in order to increase the contrast of each PDLC display; Each PDLC display is under the driving circuit control of correspondence, can realize picture disply, more specifically, regulating device is under off-position, the second liquid crystal molecule is random arrangement in the second polymeric matrix, regulating device is the black attitude, and two PDLC displays realize that single or double shows under the control of separately driving circuit; Regulating device is under "on" position, the second liquid crystal molecule is regular arrangement in the second polymeric matrix, regulating device is clear state, each PDLC display is under the control of corresponding driving circuit, can realize transparent demonstration, that is to say, double-side display device is under the condition of regulating device energising, by two PDLC displays of driving circuit control separately, can realize transparent Presentation Function.
Description of drawings
Fig. 1 is the double-side display device sectional view under the "on" position not in the embodiment of the invention;
Fig. 2 is the sectional view under the double-side display device "on" position in the embodiment of the invention.
Embodiment
Existing double-side display device only has the Presentation Function of single or double, does not have transparent Presentation Function.
Given this, the invention provides a kind of double-side display device, comprising:
Two back to the PDLC display that arranges; Wherein, each described PDLC display comprises: the tft array substrate with pixel electrode, the common electrode substrate relative with described tft array substrate position, and between described tft array substrate and described common electrode substrate, the PDLC layer of changeable clear state and scattering states;
Regulating device between two described tft array substrates; Wherein, described regulating device comprises: two transparent electrode layers that the position is relative, the color emission layer of changeable clear state and black attitude between described two transparent electrode layers.
The present invention utilizes the PDLC display can present the characteristic of transmission state and two kinds of different optical states of scattering states, and the characteristic of the changeable clear state of regulating device and black attitude, make this double-side display device both have the Presentation Function of single or double, have again transparent Presentation Function.
In order to make those skilled in the art better understand technical scheme of the present invention, below in conjunction with Figure of description the embodiment of the invention is described in detail.
As shown in Figure 1 and Figure 2, the invention provides a kind of double-side display device, comprise: a PDLC display, with the two PDLC display of a PDLC display back to setting, and the regulating device between the first PDLC display and the 2nd PDLC display; Wherein,
The one PDLC display comprises: the first tft array substrate 100 with pixel electrode, the first common electrode substrate 120 that is oppositely arranged with the first tft array substrate 100, and between the first tft array substrate 100 and the first common electrode substrate 120, a PDLC layer 110 of changeable clear state and scattering states;
The 2nd PDLC display comprises: the second tft array substrate 300 with pixel electrode, the second common electrode substrate 320 that is oppositely arranged with the second tft array substrate 300, and between the second tft array substrate 300 and the second common electrode substrate 320, the 2nd PDLC layer 310 of changeable clear state and scattering states;
Regulating device is between the first tft array substrate 100 and the second tft array substrate 300, comprise: the first transparent electrode layer 200, second transparent electrode layer 220 relative with the first transparent electrode layer 200 positions, the color emission layer 210 of changeable clear state and black attitude between the first transparent electrode layer 200 and the second transparent electrode layer 220.
Particularly, because a PDLC display is identical structure with the 2nd PDLC display, the below is described as an example of a PDLC display example.Wherein, the first tft array substrate 100, the first common electrode substrate 120 and the second tft array substrate 300, the second common electrode substrate 320, concrete structure and function are well known to those skilled in the art, and are not described in detail here.
Preferably, referring to Fig. 1, Fig. 2, a PDLC layer 110 and comprising: the first polymeric matrix 111 is arranged in the first liquid crystal molecule 112 and the dichroic dye 113 of the first polymeric matrix 111.Wherein, the first liquid crystal molecule 112 is nematic liquid crystal or smectic liquid crystal; Dichroic dye 113 comprises Red Green Blue, display color when a PDLC layer 110 is in scattering states.More particularly, the first liquid crystal molecule 112 and dichroic dye 113 are dispersed in the first polymeric matrix 111 uniformly with the form of droplet, and the first polymeric matrix 111 provides stable network structure for droplet; When a PDLC display is applied driving voltage, the regular arrangement under the effect of electric field of the first liquid crystal molecule 112 and dichroic dye 113, the refractive index of the refractive index of droplet and the first polymeric matrix 111 is complementary, and this moment, the one PDLC layer 110 was clear state; When a PDLC display not being applied driving voltage, the first liquid crystal molecule 112 and dichroic dye 113 random arrangements, the refractive index of cause the first liquid crystal molecule 112 is anisotropic, the refractive index of droplet and the refractive index of the first polymeric matrix 111 are not mated, and this moment, the one PDLC layer 110 was scattering states; Simultaneously because of the existence of dichroic dye 113, when a PDLC layer 110 is in scattering states, a PDLC display display color.Therefore, a PDLC layer 110 has significant photoelectric characteristic, can present two kinds of different optical states of transmission state and scattering states; Compare with traditional twisted liquid crystal display, adopt the advantage of the PDLC display of a PDLC layer 110 making do not need to be polaroid and oriented layer, preparation technology is simple, easily makes a flexible large-area PDLC display.
Preferably, in above-mentioned regulating device, the first transparent electrode layer 200 and the second transparent electrode layer 220 place respectively on the first tft array substrate 100 and the second tft array substrate 300, so can reduce the thickness of double-side display device.
Preferably, continue referring to Fig. 1, Fig. 2, color emission layer 210 comprises: the second polymeric matrix 211 is arranged in the second liquid crystal molecule 212 and the black dyes 213 of the second polymeric matrix 211; Wherein, the second liquid crystal molecule 212 is nematic liquid crystal, smectic liquid crystal or cholesteric liquid crystal; Black dyes 213 shows black when color emission layer 210 is in scattering states.More particularly, the second liquid crystal molecule 212 and black dyes 213 are dispersed in the second polymeric matrix 211 uniformly with the form of droplet, and the second polymeric matrix 211 provides stable network structure for droplet.When regulating device is applied driving voltage, namely between the first transparent electrode layer 200 and the second transparent electrode layer 220, form electric field, the regular arrangement under electric field action of the second liquid crystal molecule 212 and black dyes 213, the refractive index of the refractive index of droplet and the second polymeric matrix 211 is complementary, this moment, color emission layer 210 was clear state, when regulating device not being applied driving voltage, the second liquid crystal molecule 212 and black dyes 213 random arrangements, the refractive index of cause the second liquid crystal molecule 212 is anisotropic, the refractive index of droplet and the refractive index of the second polymeric matrix 211 are not mated, and this moment, color emission layer 210 was scattering states; Because of the existence of black dyes, when being in scattering states, color emission layer 210 shows black simultaneously.Therefore, regulating device has significant photoelectric characteristic, can switch under clear state and two kinds of optical states of black attitude.
Preferably, double-side display device further comprises: three driving circuits that are connected with regulating device with two PDLC displays respectively, that is to say, the one PDLC display, the 2nd PDLC display and regulating device connect a driving circuit separately, control separately the duty of a PDLC display, the 2nd PDLC display by these three driving circuits, make two PDLC displays in the double-side display device show identical or different contents; For example, need to be when a PDLC display shows identical content with the 2nd PDLC display, the one PDLC display and the 2nd PDLC display are sent identical driving signal get final product, the concrete structure of driving circuit is well known to those skilled in the art, and here just has not been described in detail.When regulating device was applied driving voltage, regulating device was clear state, and apply driving voltage to a PDLC display, the 2nd PDLC display this moment respectively, can realize the transparent Presentation Function of double-side display device; When not applying driving voltage to regulating device, regulating device is the black attitude, and apply driving voltage to a PDLC display, the 2nd PDLC display this moment respectively, can realize the single or double Presentation Function of double-side display device.
Below by the description to the double-side display device displaying principle, come the double-sided device in further instruction the present embodiment.
Continuation is referring to Fig. 2, when respectively a PDLC display, the 2nd PDLC display and regulating device being applied driving voltage, the regular arrangement under residing electric field action separately of the first liquid crystal molecule 112 in the one PDLC display, the 2nd PDLC display and dichroic dye, this moment, the one PDLC display, the 2nd PDLC display were clear state; And the second liquid crystal molecule 212 in the regulating device and black dyes 213 regular arrangement under electric field action, this moment, regulating device was clear state; That is to say, when simultaneously a PDLC display, the 2nd PDLC display and regulating device being applied driving voltage, double-side display device is realized transparent Presentation Function.
Continuation is referring to Fig. 1, when regulating device is not applied driving voltage, when namely regulating device is in off-position, the second liquid crystal molecule 212 in the regulating device and black dyes 213 random arrangements, produce scattering when light is mapped on the regulating device, because of the existence of black dyes, this moment, regulating device was the black attitude simultaneously.And when regulating device was in the black attitude, regulating device can be used as the substrate of a PDLC display and the 2nd PDLC display, when a PDLC display and the 2nd PDLC display display frame, can increase contrast.Respectively a PDLC display and the 2nd PDLC display are applied driving voltage, because a PDLC display and the 2nd PDLC display all adopt tft array substrate, TFT is as voltage cut-out, and the voltage of controlling each pixel region writes and keeps; In each PDLC display, the first liquid crystal molecule 112 regular arrangement under electric field action that each pixel region is corresponding is clear state; Random arrangement without electric field action the time because of the existence of dichroic dye, is colored scattering states simultaneously; Therefore, the one PDLC display or the 2nd PDLC display are when carrying out the image demonstration, need the pixel region that shows image is not applied driving voltage, the pixel region of display image area is not applied driving voltage, pixel region as for how to a PDLC display or the 2nd PDLC display applies or does not apply driving voltage, be well known to those skilled in the art, just be not described in detail here.
In sum, the double-side display device that the present embodiment provides, regulating device have two kinds of optical states: clear state and black attitude; When regulating device cut off the power supply, this moment, regulating device was the black attitude, can be used as the substrate of two PDLC displays, in order to increase the contrast of each PDLC display; Each PDLC display can be realized picture disply under each self-corresponding driving circuit control, that is to say, double-side display device by two PDLC displays of driving circuit control separately, realizes that single or double shows under the condition of regulating device outage; When regulating device is switched on, regulating device is clear state, each PDLC display is under the control of corresponding driving circuit, can realize transparent demonstration, that is to say, double-side display device by two PDLC displays of driving circuit control separately, can be realized transparent functional under the condition of regulating device energising.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (8)
1. a double-side display device is characterized in that, comprising:
Two back to the Polymer Dispersed Liquid Crystal PDLC display that arranges; Wherein, each described PDLC display comprises: the thin film transistor (TFT) tft array substrate with pixel electrode, the common electrode substrate relative with described tft array substrate position, and between described tft array substrate and described common electrode substrate, the PDLC layer of changeable clear state and scattering states;
Regulating device between two described tft array substrates; Wherein, described regulating device comprises: two transparent electrode layers that the position is relative, the color emission layer of changeable clear state and black attitude between described two transparent electrode layers.
2. double-side display device as claimed in claim 1 is characterized in that, described PDLC layer comprises: the first polymeric matrix is arranged in the first liquid crystal molecule and the dichroic dye of described the first polymeric matrix.
3. double-side display device as claimed in claim 2 is characterized in that, described the first liquid crystal molecule is nematic liquid crystal or smectic liquid crystal.
4. double-side display device as claimed in claim 2 is characterized in that, display color when described PDLC layer is in scattering states.
5. double-side display device as claimed in claim 1 is characterized in that, described two transparent electrode layers place respectively on two described tft array substrates.
6. double-side display device as claimed in claim 5 is characterized in that, described color emission layer comprises: the second polymeric matrix is arranged in the second liquid crystal molecule and the black dyes of described the second polymeric matrix.
7. double-side display device as claimed in claim 6 is characterized in that, described the second liquid crystal molecule is nematic liquid crystal, smectic liquid crystal or cholesteric liquid crystal.
8. such as the arbitrary described double-side display device of claim 1-7, it is characterized in that, further comprise: respectively with described two PDLC displays be connected three driving circuits that regulating device is connected.
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| CN103293793A (en) * | 2013-05-31 | 2013-09-11 | 京东方科技集团股份有限公司 | Double-side display panel and manufacturing method thereof |
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| CN104376796A (en) * | 2014-11-17 | 2015-02-25 | 深圳市华星光电技术有限公司 | Transparent display device |
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| CN105122123A (en) * | 2013-03-19 | 2015-12-02 | 惠普发展公司，有限责任合伙企业 | Dual-sided display |
| WO2014173148A1 (en) * | 2013-04-27 | 2014-10-30 | 京东方科技集团股份有限公司 | Baffle board and transparent display apparatus |
| CN103293793B (en) * | 2013-05-31 | 2016-06-01 | 京东方科技集团股份有限公司 | A kind of double face display panel and manufacture method thereof |
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| US10423022B2 (en) | 2014-05-29 | 2019-09-24 | Lg Display Co., Ltd. | Light shielding apparatus, method of fabricating the same, and transparent display device including the same |
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| CN106610547A (en) * | 2015-10-26 | 2017-05-03 | 中华映管股份有限公司 | Display apparatus and display method |
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