CN102914899B - Double-sided display device - Google Patents
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- CN102914899B CN102914899B CN201210387656.4A CN201210387656A CN102914899B CN 102914899 B CN102914899 B CN 102914899B CN 201210387656 A CN201210387656 A CN 201210387656A CN 102914899 B CN102914899 B CN 102914899B
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- 239000004983 Polymer Dispersed Liquid Crystal Substances 0.000 claims abstract description 90
- 239000000758 substrate Substances 0.000 claims abstract description 50
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 34
- 239000010409 thin film Substances 0.000 claims abstract description 3
- 239000011159 matrix material Substances 0.000 claims description 22
- 229920000642 polymer Polymers 0.000 claims description 22
- 239000004988 Nematic liquid crystal Substances 0.000 claims description 6
- 239000004990 Smectic liquid crystal Substances 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims description 5
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 claims description 3
- 230000005684 electric field Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000003086 colorant Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 239000012769 display material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- Liquid Crystal (AREA)
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 invention relates to the technical field of liquid crystal display, in particular to a double-sided display device.
Background
With the continuous development of liquid crystal display technology, information display panels used in airport lounges, railway station lounges or large exhibition halls, or business halls in window industries such as communication industry, government windows, financial industry, traffic industry and the like generally adopt double-sided display devices so that users can obtain required information. The conventional double-sided display device generally includes: the two single-sided displays are oppositely arranged and are attached to each other, and each liquid crystal display independently corresponds to one driving circuit, so that the double-sided display device can realize single-sided or double-sided picture display. Such as: in addition, the double-sided display further comprises a third-level half, wherein the third-level half is provided with a common electrode, the second substrate is provided with a second pixel electrode corresponding to the common electrode of the third-level half, the display material is encapsulated between the second substrate and the third-level half, and the second pixel electrode displays image information under the control of the processor.
However, as user requirements increase, for example: the double-sided display device is required to realize a single-sided or double-sided display function in a working mode, and is required to be transparent outside the working mode, or the double-sided display device can be arranged on a window in order to save occupied space, the single-sided or double-sided display function can be realized in the working mode, and the light transmission of the window cannot be influenced in a non-working mode; the current double-sided display device does not have a transparent display function.
Disclosure of Invention
The invention provides a double-sided display device which can realize single-sided display or double-sided display and transparent display.
In order to achieve the purpose, the invention provides the following technical scheme:
a dual-sided display device comprising:
two Polymer Dispersed Liquid Crystal (PDLC) displays arranged opposite to each other; wherein each PDLC display comprises: a Thin Film Transistor (TFT) array substrate having a pixel electrode, a common electrode substrate disposed opposite to the TFT array substrate, and a PDLC layer located between the TFT array substrate and the common electrode substrate and capable of switching between a transparent state and a scattering state;
the color mixer is positioned between the two TFT array substrates; wherein the color mixer comprises: the two transparent electrode layers are oppositely arranged, and the color adjusting layer capable of switching between a transparent state and a black state is arranged between the two transparent electrode layers.
Preferably, the PDLC layer comprises: a first polymer matrix, first liquid crystal molecules and a dichroic dye located in the first polymer matrix.
Preferably, the first liquid crystal molecules are nematic liquid crystals or smectic liquid crystals.
Preferably, the PDLC layer displays colour when in the scattering state.
Preferably, the two transparent electrode layers are respectively disposed on the two TFT array substrates.
Preferably, the color modulation layer includes: a second polymer matrix, second liquid crystal molecules and a black dye located in the second polymer matrix.
Preferably, the second liquid crystal molecules are nematic liquid crystal, smectic liquid crystal or cholesteric liquid crystal.
Further, the double-sided display device further includes: and the three driving circuits are respectively connected with the two PDLC displays and the color mixer.
In the double-sided display device provided by the invention, the color mixer has two optical states: a transparent state and a black state; when the color mixer is in a black state, the color mixer can be used as a substrate of two PDLC displays to increase the contrast of each PDLC display; each PDLC display can realize picture display under the control of a corresponding driving circuit, more specifically, when the color mixer is in a power-off state, second liquid crystal molecules are randomly arranged in a second polymer matrix, the color mixer is in a black state, and the two PDLC displays realize single-sided or double-sided display under the control of respective driving circuits; when the color mixer is in a power-on state, the second liquid crystal molecules are regularly arranged in the second polymer matrix, the color mixer is in a transparent state, and each PDLC display can realize transparent display under the control of the corresponding drive circuit, namely, the double-sided display device can realize the transparent display function by controlling two PDLC displays through respective drive circuits under the power-on condition of the color mixer.
Drawings
FIG. 1 is a cross-sectional view of a dual-sided display device in an unpowered state according to an embodiment of the invention;
fig. 2 is a cross-sectional view of the dual-sided display device in an energized state according to the embodiment of the invention.
Detailed Description
The conventional double-sided display device has only a single-sided or double-sided display function and does not have a transparent display function.
In view of this, the present invention provides a dual-sided display device including:
two PDLC displays arranged oppositely; wherein each of the PDLC displays comprises: the liquid crystal display comprises a TFT array substrate with a pixel electrode, a common electrode substrate opposite to the TFT array substrate, and a PDLC layer which is positioned between the TFT array substrate and the common electrode substrate and can switch between a transparent state and a scattering state;
the color mixer is positioned between the two TFT array substrates; wherein the color mixer comprises: the two transparent electrode layers are opposite in position, and the color adjusting layer capable of switching between a transparent state and a black state is arranged between the two transparent electrode layers.
The invention utilizes the characteristic that the PDLC display can present two different optical states of a transmission state and a scattering state and the characteristic that the color mixer can switch between a transparent state and a black state, so that the double-sided display device has a single-sided or double-sided display function and also has a transparent display function.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings.
As shown in fig. 1 and 2, the present invention provides a double-sided display device including: the display device comprises a first PDLC display, a second PDLC display and a color mixer, wherein the second PDLC display is arranged opposite to the first PDLC display; wherein,
the first PDLC display comprises: a first TFT array substrate 100 having a pixel electrode, a first common electrode substrate 120 disposed opposite to the first TFT array substrate 100, and a first PDLC layer 110 located between the first TFT array substrate 100 and the first common electrode substrate 120 and switchable between a transparent state and a scattering state;
the second PDLC display includes: a second TFT array substrate 300 having a pixel electrode, a second common electrode substrate 320 disposed opposite to the second TFT array substrate 300, and a second PDLC layer 310 switchable between a transparent state and a scattering state between the second TFT array substrate 300 and the second common electrode substrate 320;
the color mixer is located between the first TFT array substrate 100 and the second TFT array substrate 300, and includes: the liquid crystal display panel comprises a first transparent electrode layer 200, a second transparent electrode layer 220 opposite to the first transparent electrode layer 200, and a color-adjusting layer 210 which is positioned between the first transparent electrode layer 200 and the second transparent electrode layer 220 and can switch between a transparent state and a black state.
Specifically, since the first PDLC display and the second PDLC display have the same structure, the first PDLC display is described as an example below. The specific structures and functions of the first TFT array substrate 100, the first common electrode substrate 120, the second TFT array substrate 300, and the second common electrode substrate 320 are well known to those skilled in the art and will not be described in detail herein.
Preferably, referring to fig. 1 and 2, the first PDLC layer 110 further includes: a first polymer matrix 111, first liquid crystal molecules 112 and a dichroic dye 113 positioned in the first polymer matrix 111. Wherein, the first liquid crystal molecules 112 are nematic liquid crystal or smectic liquid crystal; the dichroic dye 113 includes three primary colors of red, green, and blue, and displays colors when the first PDLC layer 110 is in a scattering state. More specifically, the first liquid crystal molecules 112 and the dichroic dye 113 are uniformly dispersed in the first polymer matrix 111 in the form of droplets, and the first polymer matrix 111 provides a stable network structure for the droplets; when a driving voltage is applied to the first PDLC display, the first liquid crystal molecules 112 and the dichroic dye 113 are regularly arranged under the action of an electric field, and the refractive index of the droplets matches the refractive index of the first polymer matrix 111, so that the first PDLC layer 110 is in a transparent state; when no driving voltage is applied to the first PDLC display, the first liquid crystal molecules 112 and the dichroic dye 113 are randomly arranged, and the refractive index of the droplets is mismatched with that of the first polymer matrix 111 due to the anisotropic refractive index of the first liquid crystal molecules 112, so that the first PDLC layer 110 is in a scattering state; while the first PDLC display shows color when the first PDLC layer 110 is in a scattering state due to the presence of the dichroic dye 113. Therefore, the first PDLC layer 110 has significant electro-optical characteristics, and can assume two different optical states, a transmission state and a scattering state; compared with the conventional twisted liquid crystal display, the PDLC display manufactured by using the first PDLC layer 110 has the advantages of no need of a polarizer and an alignment layer, simple manufacturing process, and easy manufacture of the flexible large-area first PDLC display.
Preferably, in the above color tuner, the first transparent electrode layer 200 and the second transparent electrode layer 220 are disposed on the first TFT array substrate 100 and the second TFT array substrate 300, respectively, so that the thickness of the double-sided display device can be reduced.
Preferably, with continued reference to fig. 1 and 2, the color modulation layer 210 includes: a second polymer matrix 211, second liquid crystal molecules 212 and a black dye 213 positioned in the second polymer matrix 211; wherein, the second liquid crystal molecules 212 are nematic liquid crystal, smectic liquid crystal or cholesteric liquid crystal; the black dye 213 shows a black color when the toner layer 210 is in a scattering state. More specifically, the second liquid crystal molecules 212 and the black dye 213 are uniformly dispersed in the second polymer matrix 211 in the form of droplets, and the second polymer matrix 211 provides a stable network structure for the droplets. When a driving voltage is applied to the color modulator, namely an electric field is formed between the first transparent electrode layer 200 and the second transparent electrode layer 220, the second liquid crystal molecules 212 and the black dye 213 are regularly arranged under the action of the electric field, the refractive index of the droplets is matched with that of the second polymer matrix 211, the color modulation layer 210 is in a transparent state, when the driving voltage is not applied to the color modulator, the second liquid crystal molecules 212 and the black dye 213 are irregularly arranged, and the refractive index of the droplets is not matched with that of the second polymer matrix 211 due to the fact that the refractive index of the second liquid crystal molecules 212 is anisotropic, and the color modulation layer 210 is in a scattering state; and displays black when the color modulation layer 210 is in a scattering state due to the presence of the black dye. Thus, the color modulator has significant electro-optical characteristics and can be switched between two optical states, a transparent state and a black state.
Preferably, the dual-sided display device further includes: the two PDLC displays in the double-sided display device display the same or different contents by independently controlling the working states of the first PDLC display and the second PDLC display through the three driving circuits; for example, when the first PDLC display and the second PDLC display the same content, the same driving signal may be transmitted to the first PDLC display and the second PDLC display, and the specific structure of the driving circuit is well known to those skilled in the art and will not be described in detail herein. When the driving voltage is applied to the color modulator, the color modulator is in a transparent state, and the driving voltage is respectively applied to the first PDLC display and the second PDLC display at the moment, so that the transparent display function of the double-sided display device can be realized; when the driving voltage is not applied to the color mixer, the color mixer is in a black state, and the driving voltage is respectively applied to the first PDLC display and the second PDLC display at the moment, so that the single-sided or double-sided display function of the double-sided display device can be realized.
The double-sided display device in the present embodiment will be further described below by describing the display principle of the double-sided display device.
With continued reference to fig. 2, when driving voltages are applied to the first PDLC display, the second PDLC display and the color mixer, the first liquid crystal molecules 112 and the dichroic dye in the first PDLC display and the second PDLC display are regularly arranged under the action of the electric fields in which they are respectively located, and at this time, the first PDLC display and the second PDLC display are in a transparent state; the second liquid crystal molecules 212 and the black dye 213 in the color mixer are regularly arranged under the action of an electric field, and the color mixer is in a transparent state; that is, when the driving voltage is applied to the first PDLC display, the second PDLC display, and the color mixer at the same time, the dual display device realizes the transparent display function.
With continued reference to fig. 1, when no driving voltage is applied to the color modulator, i.e., the color modulator is in the off state, the second liquid crystal molecules 212 and the black dye 213 in the color modulator are randomly arranged, and the light is incident on the color modulator to generate scattering, and the color modulator is in the black state due to the presence of the black dye. And when the color mixer is in a black state, the color mixer can be used as a substrate of the first PDLC display and the second PDLC display, and the contrast can be increased when the first PDLC display and the second PDLC display a picture. Driving voltages are respectively applied to the first PDLC display and the second PDLC display, and the first PDLC display and the second PDLC display both adopt TFT array substrates, and the TFTs are used as voltage control switches to control the voltage writing and maintaining of each pixel area; in each PDLC display, the first liquid crystal molecules 112 corresponding to each pixel region are regularly arranged under the action of an electric field and are in a transparent state; the materials are randomly arranged when no electric field is applied, and are in a color scattering state due to the existence of the dichroic dye; therefore, when the first PDLC display or the second PDLC display displays an image, it is necessary to apply no driving voltage to the pixel region where the image is displayed, apply a driving voltage to the pixel region where the image is not displayed, and how to apply or not apply a driving voltage to the pixel region of the first PDLC display or the second PDLC display is well known to those skilled in the art and will not be described in detail herein.
In summary, in the dual-sided display device provided in this embodiment, the color mixer has two optical states: a transparent state and a black state; when the color mixer is powered off, the color mixer is in a black state and can be used as a substrate of two PDLC displays to increase the contrast of each PDLC display; each PDLC display can realize picture display under the control of the corresponding drive circuit, namely, the double-sided display device can realize single-sided or double-sided display by controlling two PDLC displays through the respective drive circuits under the condition that the color mixer is powered off; when the color mixer is electrified, the color mixer is in a transparent state, and each PDLC display can realize transparent display under the control of the corresponding driving circuit, namely, the double-sided display device can realize the transparent function by controlling two PDLC displays through respective driving circuits under the condition that the color mixer is electrified.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A dual-sided display device, comprising:
two Polymer Dispersed Liquid Crystal (PDLC) displays arranged oppositely; wherein each of the PDLC displays comprises: the liquid crystal display comprises a Thin Film Transistor (TFT) array substrate with a pixel electrode, a common electrode substrate opposite to the TFT array substrate, and a PDLC layer which is positioned between the TFT array substrate and the common electrode substrate and can switch between a transparent state and a scattering state;
the color mixer is positioned between the two TFT array substrates; wherein the color mixer comprises: the two transparent electrode layers are opposite in position, and the color adjusting layer capable of switching between a transparent state and a black state is arranged between the two transparent electrode layers.
2. The dual sided display device of claim 1, wherein the PDLC layer comprises: a first polymer matrix, first liquid crystal molecules and a dichroic dye located in the first polymer matrix.
3. The dual-sided display device of claim 2, wherein the first liquid crystal molecules are nematic liquid crystals or smectic liquid crystals.
4. The dual sided display device of claim 2, wherein the PDLC layer displays color when in a scattering state.
5. The dual-sided display device of claim 1, wherein the two transparent electrode layers are disposed on the two TFT array substrates, respectively.
6. The dual sided display device of claim 5, wherein the color modulation layer comprises: a second polymer matrix, second liquid crystal molecules and a black dye located in the second polymer matrix.
7. The dual-sided display device of claim 6, wherein the second liquid crystal molecules are nematic, smectic, or cholesteric liquid crystals.
8. The dual sided display device of any of claims 1-7, further comprising: and the three driving circuits are respectively connected with the two PDLC displays and the color mixer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210387656.4A CN102914899B (en) | 2012-10-12 | 2012-10-12 | Double-sided display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210387656.4A CN102914899B (en) | 2012-10-12 | 2012-10-12 | Double-sided display device |
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| CN102914899A CN102914899A (en) | 2013-02-06 |
| CN102914899B true CN102914899B (en) | 2015-02-04 |
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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 |
| CN103217827B (en) * | 2013-04-27 | 2015-07-08 | 京东方科技集团股份有限公司 | Transparent display device |
| 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 |
| TW201508726A (en) * | 2013-08-23 | 2015-03-01 | Young Lighting Technology Inc | Display and displaying method thereof |
| KR20150139424A (en) * | 2014-05-29 | 2015-12-11 | 엘지디스플레이 주식회사 | Light shield apparatus, method of fabricating the light shield apparatus, and transparent display device including the light shield appratus |
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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 |
| CN104536188B (en) * | 2015-01-27 | 2018-06-26 | 京东方科技集团股份有限公司 | Transparent display and preparation method thereof |
| EP3317719A4 (en) * | 2015-06-30 | 2019-04-17 | Gauzy Ltd. | Advanced polymer dispersed liquid crystal (pdlc) for a display projection screens |
| CN106610547B (en) * | 2015-10-26 | 2019-06-14 | 中华映管股份有限公司 | Display device and display methods |
| CN105938280A (en) * | 2016-06-24 | 2016-09-14 | 京东方科技集团股份有限公司 | Double-faced displayer and display device |
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| CN106125442B (en) * | 2016-08-31 | 2019-11-01 | 京东方科技集团股份有限公司 | Double face display panel and double-side display device |
| CN106444184B (en) * | 2016-11-24 | 2019-07-05 | 京东方科技集团股份有限公司 | Double-side display device, system and display methods |
| CN108459442A (en) * | 2018-02-11 | 2018-08-28 | 深圳市华星光电技术有限公司 | Double-side display device |
| CN115836245A (en) * | 2021-07-08 | 2023-03-21 | 华为技术有限公司 | Double-sided display, display device, automobile and interaction method |
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