CN103217827A - Reflective plate and transparent display device - Google Patents
Reflective plate and transparent display device Download PDFInfo
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- CN103217827A CN103217827A CN2013101517398A CN201310151739A CN103217827A CN 103217827 A CN103217827 A CN 103217827A CN 2013101517398 A CN2013101517398 A CN 2013101517398A CN 201310151739 A CN201310151739 A CN 201310151739A CN 103217827 A CN103217827 A CN 103217827A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
Abstract
The invention discloses a reflective plate and a transparent display device, and relates to the field of liquid crystal displaying. The reflective plate comprises a first substrate, a second substrate and a liquid crystal layer arranged between the first substrate and the second substrate, wherein liquid crystal molecules in the liquid crystal layer are in a cholesteric phase. The transparent display device comprises the reflective plate, a light-guide plate, a light source and a display screen, wherein the reflective plate is arranged at the side, with net points, of the light-guide plate, the light source is arranged at a light-inlet side of the light-guide plate, and the display screen is arranged at a light-outlet side of the light-guide plate. By changing the structural state of the liquid crystal layer in the cholesteric phase, the reflective plate and the transparent display device are capable of realizing flexible switching between transparent display and non-transparent display under the condition that the assist of an environmental light source does not exist.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly a kind of reflecting plate and transparent display.
Background technology
Fig. 1 a and Fig. 1 b are a kind of existing transparent display and displaying principle synoptic diagram, this transparent display comprises: PDLC(polymer dispersed liquid crystal, Polymer Dispersed Liquid Crystal) device, light guide plate 150, display screen (panel) 160 and light source 170.The non-demonstration side of PDLC device shown in display article 110 are positioned over.And described PDLC device comprises: first transparency electrode 120, second transparency electrode 140, and be arranged on PDLC130 between described first transparency electrode 120 and second transparency electrode 140.
Referring to Fig. 1 a, when PDLC130 was in OFF state, the PDLC in the PDLC device was in scattering states, light tight, put into light guide plate 150 after this PDLC device serve as reflecting plate, can only see displaying contents in the display screen 160 this moment.Referring to Fig. 1 b, when PDLC130 was in ON state, the PDLC device was in clear state, under the effect of surround lighting 180, can see the display article 110 at rear.Based on above-mentioned principle, this transparent display can be realized the switching of transparent and nontransparent demonstration.
But there is open defect in above-mentioned existing design, and this transparent display needs environment light source auxiliary when switching to clear state.That is to say, in current transparent display application, all need to support object to show with the surround lighting at display screen rear.Therefore, cause whole display device structure comparatively complicated, can only be applied to large piece articles such as refrigerator-freezer, cabinet, lamp box, difficulty is applied in thin display spare, in mobile phone, PAD, notebook computer (Notebook), has limited its further application.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: how a kind of reflecting plate and transparent display are provided, to overcome the dependence of transparent display to surround lighting, simplify the device architecture of transparent display.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of reflecting plate, it comprises: first substrate, second substrate, and be arranged at liquid crystal layer between described first substrate and second substrate;
Liquid crystal molecule in the described liquid crystal layer is cholesteric phase.
Wherein, described liquid crystal layer also comprises chiral additives, and described chiral additives is mixed in described liquid crystal molecule between.
Wherein, the computing formula of the concentration C of described chiral additives in described liquid crystal molecule is as follows:
C=1/(P×HTP);
P=λ/Δn;
Wherein, P is the pitch of described liquid crystal molecule, and HTP is the intrinsic distortion energy constant of described liquid crystal molecule, and λ is the light wavelength that described reflecting plate is selected reflection, and Δ n is the birefraction of described liquid crystal molecule.
Wherein, described first substrate comprises: first underlay substrate is arranged on first transparent electrode layer of close described liquid crystal layer one side of described first underlay substrate;
Described second substrate comprises: second underlay substrate is arranged on second transparent electrode layer of close described liquid crystal layer one side of described second underlay substrate;
Described first transparent electrode layer and second transparent electrode layer are used to form the electric field of the TEXTURE STATE that changes described liquid crystal molecule.
Wherein, described first substrate also comprises, is arranged on first oriented layer of close described liquid crystal layer one side of described first transparent electrode layer;
Described second substrate also comprises, is arranged on second oriented layer of close described liquid crystal layer one side of described second transparent electrode layer;
Described first oriented layer and second oriented layer are used for described liquid crystal molecule is carried out antiparallel orientations.
The present invention also provides a kind of transparent display that comprises described reflecting plate, and described transparent display also comprises: light guide plate, light source and display screen;
Described reflecting plate is arranged on the side that described light guide plate is provided with the site;
Described display screen is arranged on the bright dipping side of described light guide plate;
Described light source is arranged on the light inlet side of described light guide plate.
Wherein, described light guide plate adopts the nanometer light guide plate.
Wherein, described transparent display also comprises: pcb board, mainboard and power panel;
The power supply signal line of described reflecting plate all directly is connected with described pcb board with control signal wire;
The power supply signal line of described display screen all directly is connected with described pcb board with control signal wire;
The power supply signal line of described backlight all directly is connected with described pcb board with control signal wire;
The power supply signal line of described pcb board is connected with described mainboard with control signal wire;
The power supply signal line of described mainboard is connected with described power panel.
Wherein, described pcb board is provided with the timing controller that is used for control display screen scanning-line signal and data line signal output;
The timing control signal of described timing controller output cooperates with the switch-over control signal that is used to control described reflecting plate, switches between transparent show state and nontransparent show state with the change of display frame to make described transparent display.
Wherein, described pcb board, mainboard and power panel are arranged on the zone outside the transparent viewing area of described transparent display.
(3) beneficial effect
Reflecting plate of the present invention and transparent display, the liquid crystal molecule that is cholesteric phase is set in reflecting plate, by changing the TEXTURE STATE of this liquid crystal molecule, can make transparent display between transparent demonstration and nontransparent demonstration, switch, and when transparent demonstration antireflection part light as backlight, simultaneously the other a part of light of transmission is as environment light source, thereby can realize the flexible switching of transparent demonstration and nontransparent demonstration under the situation that no environment light source is assisted; And, owing to omitted the environment light source auxiliary equipment, thereby simplified the device architecture of transparent display, made it more lightening, helped this transparent display is applied to mobile phone, PAD(panel computer), the Notebook(notebook computer) etc. in the smallclothes electronic product.
Description of drawings
Fig. 1 a and Fig. 1 b are a kind of existing transparent display and displaying principle synoptic diagram;
Fig. 2 a and Fig. 2 b are the reflecting plate and the index paths thereof of the embodiment of the invention 1;
Fig. 2 c is the structural representation of the reflecting plate of the embodiment of the invention 1;
Fig. 3 a is the partial structurtes synoptic diagram of the transparent display of the embodiment of the invention 2;
Fig. 3 b is the circuit connection diagram of the transparent display of the embodiment of the invention 2.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
The present invention program has removed the environment light source auxiliary equipment when realizing that transparent demonstration and normal demonstration are switched, simplified device architecture, can make transparent display further be applied in thin display spare, has expanded the practical application of transparent demonstration.The present invention is described in detail below in conjunction with embodiment and accompanying drawing.
Embodiment 1
Can realize transparent demonstration when being implemented in no environment light source, need back light source structure and optical design are done further to optimize, the invention provides a kind of reflecting plate.This reflecting plate has following feature:
1) during transparent demonstration, but this reflecting plate antireflection part light use as the backlight of display screen, and the other a part of light of transmission uses as environment light source;
2) during nontransparent demonstration, this reflecting plate can reflect most of light to be used as the backlight of display screen, and scattering part light is gone out.
Fig. 2 a and Fig. 2 b are the reflecting plate and the index paths thereof of the embodiment of the invention 1, and wherein, described reflecting plate comprises: first substrate 221, second substrate 222, and be arranged at liquid crystal layer 230 between described first substrate 221 and second substrate 222.Liquid crystal molecule in the described liquid crystal layer 230 is cholesteric phase.
The liquid crystal molecule that is cholesteric phase, for left-handed to liquid crystal molecule or dextrorotation to liquid crystal molecule.With left-handed be example to liquid crystal molecule, under the planar texture state, this liquid crystal molecule is arranged in parallel planar, but the direction of orientation of liquid crystal molecule changes slightly in the adjacent plane, do the spiral fashion change along the normal direction on plane, the distance of 360 ° of variations of direction of orientation experience is called spiral shell square P.Like this left-handed can be carried out the Bragg reflection of a part to incident light to liquid crystal molecule, and reflected light is a left circularly polarized light, and the transmission right-circularly polarized light, thereby has realized selective reflecting.
In order to set the light wavelength λ that selects reflection, a kind of preferred embodiment is the chiral additives that mixes predetermined concentration C in described liquid crystal molecule, can change the pitch P of described liquid crystal molecule by adding described chiral additives, and then change the light wavelength λ that described reflecting plate is selected reflection.
When λ one timing, the computing formula of the concentration C of described chiral additives is as follows:
C=1/(P×HTP);
P=λ/Δn;
Wherein, HTP is the intrinsic distortion energy constant of described liquid crystal molecule, and Δ n is the birefraction of described liquid crystal molecule.
According to above-mentioned principle, the described chiral additives of variable concentrations is set by the zones of different at described liquid crystal layer 230, can make the pitch of the liquid crystal molecule of zones of different in the described liquid crystal layer 230 be worth distribution in gradient, and then can realize the light in the predetermined wavelength range is reflected.Like this, by light wavelength scope that described liquid crystal layer 230 selects reflection being set, can improve the utilization factor of the light that light source is sent greater than the light wavelength scope that described light source sends.
Wherein, the described chiral additives that variable concentrations is set in the zones of different of described liquid crystal layer 230 can adopt the mix liquid crystal molecule of described chiral additives of UV-irradiation, polymerisable monomer, the potpourri that UV absorbers and light trigger form, because described chiral additives its molecular diffusion speed difference under different ultraviolet ray intensities, can make near the concentration of chiral additives described in the liquid crystal molecule at ultraviolet source place higher, concentration away from chiral additives described in the liquid crystal molecule at ultraviolet source place is lower, and by the polymerization of polymerisable monomer the pitch of the cholesteric liquid crystal of zones of different is fixed, thereby the liquid crystal pitch gradient that has formed comparatively stable zones of different distributes.The formation that the cholesteric liquid crystal pitch gradient distributes also has other preparation method, does not repeat them here.
Fig. 2 c is the structural representation of described first substrate 221, shown in 2c, described first substrate comprises: the first underlay substrate 221a, be arranged on the first transparent electrode layer 221b of close described liquid crystal layer 230 1 sides of the described first substrate 221a, and the first oriented layer 221c that is arranged on close described liquid crystal layer 230 1 sides of the described first transparent electrode layer 221b.
Described second substrate 222 is identical with described first substrate, 221 structures, it comprises: second underlay substrate, be arranged on second transparent electrode layer of close described liquid crystal layer 230 1 sides of described second underlay substrate, and second oriented layer that is arranged on close described liquid crystal layer 230 1 sides of described second transparent electrode layer.
Wherein, the described first transparent electrode layer 221b and second transparent electrode layer are used to form the electric field of the TEXTURE STATE that changes described liquid crystal molecule.The described first oriented layer 221c and second oriented layer are used for described liquid crystal molecule is carried out antiparallel orientations.Need to prove that the described first oriented layer 221c and second oriented layer also can be omitted, and at this moment can adopt other modes that described liquid crystal molecule is carried out antiparallel orientations, such as adopting the illumination mode.
Below the principle of work of the described reflecting plate of the embodiment of the invention is described as follows:
Referring to Fig. 2 a, suppose that still the liquid crystal molecule in the described liquid crystal layer 230 is left-handed to liquid crystal molecule, after (being under the non-power status) first oriented layer and second oriented layer are carried out antiparallel orientations to it by default, describedly left-handedly be planar texture to liquid crystal molecule, under this TEXTURE STATE, the described left-handed Bragg reflection that can carry out a part to liquid crystal molecule to the incident light that light source 210 sends, reflected light is a left circularly polarized light, and transmitted light is a right-circularly polarized light, thereby realizes selective reflecting.The left circularly polarized light of reflection shines display screen more uniformly through after the light guide plate, can be used as the backlight of display screen; And, can provide surround lighting by the right-circularly polarized light of transmission, therefore, can see the object at screen rear.
Referring to Fig. 2 b, when by described first transparency electrode and second transparency electrode to described left-handed when liquid crystal molecule applies electric field, described left-handed molecule texture to liquid crystal molecule becomes focal conic texture, liquid crystal molecule becomes the state of random distribution, scattering and reflection can take place through described left-handed when liquid crystal molecule in the light of light source 210.Because scattering takes place, and the object at display screen rear can't be seen clearly; And the light of reflection still can provide display backlight, thereby realize nontransparent demonstration.
The described reflecting plate of present embodiment is the TEXTURE STATE of the liquid crystal molecule of cholesteric phase by change, can realize the flexible switching of transparent demonstration and nontransparent demonstration under the auxiliary situation of no environment light source.Simultaneously, the described reflecting plate of present embodiment is transparent show state when non-energising, helps reducing the power consumption of transparent display.
Embodiment 2
Fig. 3 a is the partial structurtes synoptic diagram of the transparent display of the embodiment of the invention 2, and shown in Fig. 3 a, described transparent display also comprises: light guide plate 320, light source 330 and display screen 310 except comprising embodiment 1 described reflecting plate 340.
Concrete, described reflecting plate 340 is set in parallel in the side that described light guide plate 320 is provided with the site; Described display screen 310 is set in parallel in the bright dipping side of described light guide plate 320; Described light source 330 is arranged on the light inlet side of described light guide plate 320.
Wherein, described light guide plate 320 need have higher transmittance, can adopt the saturating light guide plate of ultra-thin height, preferably adopts the nanometer light guide plate.Described light guide plate 320 is generally the side entering type light guide plate.Described backlight 330 can adopt the LED(light emitting diode) the lamp bar, and described LED lamp bar can be arranged on the both sides of described light guide plate 320, one-sided or four sides, also can be arranged on the corner of described light guide plate 320.In the present embodiment, described LED lamp bar is symmetricly set on the both sides of described light guide plate 320.
Fig. 3 b is the circuit connection diagram of the transparent display of the embodiment of the invention 2, and shown in Fig. 3 b, described transparent display further comprises: the PCB(printed circuit board (PCB)) plate 350, mainboard 360 and power panel 370.
Concrete, the power supply signal line of described reflecting plate 340 all directly is connected with described pcb board 350 with control signal wire; The power supply signal line of described display screen 310 all directly is connected with described pcb board 350 with control signal wire; The power supply signal line of described backlight 330 all directly is connected with described pcb board 350 with control signal wire.The power supply signal line of described pcb board 350 is connected with described mainboard 360 with control signal wire; The power supply signal line of described mainboard 360 is connected with described power panel 370.
Wherein, described pcb board 350 is provided with the T-con timing controller, and described T-con timing controller is used for control display screen scanning-line signal and data line signal output.The switching of described reflecting plate 340 between transparent show state and nontransparent show state, mainly be to control by switch-over control signal whether to cut off or provide power supply to realize, therefore, as long as external power supply switch, or the light activated switch of a built-in band infrared remote receiver, the infrared remote control switch by the outside carries out switching controls.When the switching of described reflecting plate 340 will change along with the change of specific display frame, its gauge tap and T-con timing controller can be integrated into a control chip, can make the timing control signal of described timing controller output be used to control the switch-over control signal of described reflecting plate by this control chip, and then make described transparent display between transparent show state and nontransparent show state, switch with the change of display frame.Such as, when display frame during, switch to transparent show state, thereby make the background of the outdoor scenes such as algae, cobble at transparent display rear, to build the display effect of actual situation combination as above-mentioned display frame for the goldfish that in water, moves about; And when display frame is the grassland scene, switch to nontransparent display device, show according to common display mode.
In the present embodiment, described mainboard 360 and described power panel 370 integrated being arranged on the same circuit board to improve the integrated level of described display device, reduce its volume.Described transparent display can be large piece articles such as refrigerator-freezer, cabinet, lamp box, also can look mobile phone, PAD, Notebook etc.Simultaneously, described pcb board 350, mainboard 360 and power panel 370 preferably are arranged on the zone outside the transparent viewing area of described transparent display, such as the vacant periphery of the display screen of putting into mobile phone or PAD, the perhaps base of display, perhaps keyboard lower zone of notebook computer etc.
Described reflecting plate of the embodiment of the invention and transparent display, the liquid crystal molecule that is cholesteric phase is set in reflecting plate, by changing the TEXTURE STATE of this liquid crystal molecule, can make transparent display between transparent demonstration and nontransparent demonstration, switch, and when transparent demonstration antireflection part light as backlight, simultaneously the other a part of light of transmission is as environment light source, thereby can realize the flexible switching of transparent demonstration and nontransparent demonstration under the situation that no environment light source is assisted; And, owing to omitted the environment light source auxiliary equipment, thereby simplified the device architecture of transparent display, made it more lightening, helped this transparent display is applied to mobile phone, PAD(panel computer), the Notebook(notebook computer) etc. in the smallclothes electronic product.
Above embodiment only is used to illustrate the present invention; and be not limitation of the present invention; the those of ordinary skill in relevant technologies field; under the situation that does not break away from the spirit and scope of the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (10)
1. a reflecting plate is characterized in that, comprising: first substrate, second substrate, and be arranged at liquid crystal layer between described first substrate and second substrate;
Liquid crystal molecule in the described liquid crystal layer is cholesteric phase.
2. reflecting plate as claimed in claim 1 is characterized in that described liquid crystal layer also comprises chiral additives, and described chiral additives is mixed in described liquid crystal molecule between.
3. reflecting plate as claimed in claim 2 is characterized in that, the computing formula of the concentration C of described chiral additives in described liquid crystal molecule is as follows:
C=1/(P×HTP);
P=λ/Δn;
Wherein, P is the pitch of described liquid crystal molecule, and HTP is the intrinsic distortion energy constant of described liquid crystal molecule, and λ is the light wavelength that described reflecting plate is selected reflection, and Δ n is the birefraction of described liquid crystal molecule.
4. reflecting plate as claimed in claim 1 is characterized in that,
Described first substrate comprises: first underlay substrate is arranged on first transparent electrode layer of close described liquid crystal layer one side of described first underlay substrate;
Described second substrate comprises: second underlay substrate is arranged on second transparent electrode layer of close described liquid crystal layer one side of described second underlay substrate;
Described first transparent electrode layer and second transparent electrode layer are used to form the electric field of the TEXTURE STATE that changes described liquid crystal molecule.
5. reflecting plate as claimed in claim 4 is characterized in that,
Described first substrate also comprises, is arranged on first oriented layer of close described liquid crystal layer one side of described first transparent electrode layer;
Described second substrate also comprises, is arranged on second oriented layer of close described liquid crystal layer one side of described second transparent electrode layer;
Described first oriented layer and second oriented layer are used for described liquid crystal molecule is carried out antiparallel orientations.
6. a transparent display that comprises each described reflecting plate of claim 1 to 5 is characterized in that, described transparent display also comprises: light guide plate, light source and display screen;
Described reflecting plate is arranged on the side that described light guide plate is provided with the site;
Described display screen is arranged on the bright dipping side of described light guide plate;
Described light source is arranged on the light inlet side of described light guide plate.
7. transparent display as claimed in claim 6 is characterized in that, described light guide plate adopts the nanometer light guide plate.
8. transparent display as claimed in claim 6 is characterized in that, described transparent display also comprises: pcb board, mainboard and power panel;
The power supply signal line of described reflecting plate all directly is connected with described pcb board with control signal wire;
The power supply signal line of described display screen all directly is connected with described pcb board with control signal wire;
The power supply signal line of described backlight all directly is connected with described pcb board with control signal wire;
The power supply signal line of described pcb board is connected with described mainboard with control signal wire;
The power supply signal line of described mainboard is connected with described power panel.
9. transparent display as claimed in claim 8 is characterized in that,
Described pcb board is provided with the timing controller that is used for control display screen scanning-line signal and data line signal output;
The timing control signal of described timing controller output cooperates with the switch-over control signal that is used to control described reflecting plate, switches between transparent show state and nontransparent show state with the change of display frame to make described transparent display.
10. transparent display as claimed in claim 8 or 9 is characterized in that, described pcb board, mainboard and power panel are arranged on the zone outside the transparent viewing area of described transparent display.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310151739.8A CN103217827B (en) | 2013-04-27 | 2013-04-27 | Transparent display device |
| PCT/CN2013/089599 WO2014173148A1 (en) | 2013-04-27 | 2013-12-16 | Baffle board and transparent display apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310151739.8A CN103217827B (en) | 2013-04-27 | 2013-04-27 | Transparent display device |
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| CN103217827A true CN103217827A (en) | 2013-07-24 |
| CN103217827B CN103217827B (en) | 2015-07-08 |
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| CN106646987A (en) * | 2017-03-24 | 2017-05-10 | 电子科技大学 | Transparent display |
| CN107633822A (en) * | 2017-10-27 | 2018-01-26 | 上海天马微电子有限公司 | A kind of driving method of display device and display device |
| CN107633822B (en) * | 2017-10-27 | 2020-06-05 | 上海天马微电子有限公司 | Display device and driving method thereof |
| CN108957862A (en) * | 2018-10-09 | 2018-12-07 | 京东方科技集团股份有限公司 | Transparent display and container |
| CN108957862B (en) * | 2018-10-09 | 2022-05-10 | 京东方科技集团股份有限公司 | Transparent display device and container |
| CN109946867A (en) * | 2019-04-25 | 2019-06-28 | 深圳市华星光电技术有限公司 | Transparent display panel and transparent display |
| CN110928046A (en) * | 2019-12-06 | 2020-03-27 | 合肥泰沃达智能装备有限公司 | Transparent display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103217827B (en) | 2015-07-08 |
| WO2014173148A1 (en) | 2014-10-30 |
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