CN103217827B - Transparent display device - Google Patents

Transparent display device Download PDF

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Publication number
CN103217827B
CN103217827B CN201310151739.8A CN201310151739A CN103217827B CN 103217827 B CN103217827 B CN 103217827B CN 201310151739 A CN201310151739 A CN 201310151739A CN 103217827 B CN103217827 B CN 103217827B
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liquid crystal
display
substrate
transparent display
guide plate
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CN201310151739.8A
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CN103217827A (en
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李文波
张培林
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to CN201310151739.8A priority Critical patent/CN103217827B/en
Publication of CN103217827A publication Critical patent/CN103217827A/en
Priority to PCT/CN2013/089599 priority patent/WO2014173148A1/en
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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/137Devices 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
    • G02F1/13718Devices 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

A kind of transparent display
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 is a kind of existing transparent display and displaying principle schematic 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.Display product 110 is positioned over the non-displaying side of shown PDLC device.Further, described PDLC device comprises: the first transparency electrode 120, second transparency electrode 140, and is arranged on the PDLC130 between described first transparency electrode 120 and the second transparency electrode 140.
See Fig. 1 a, when PDLC130 is in OFF state, the PDLC in PDLC device is in scattering states, light tight, and after putting into light guide plate 150, this PDLC device serves as reflecting plate, now can only see the displaying contents in display screen 160.See Fig. 1 b, when PDLC130 is in ON state, PDLC device is in clear state, under the effect of surround lighting 180, can see the display product 110 at rear.Based on above-mentioned principle, this transparent display can realize the switching of transparent and nontransparent display.
But above-mentioned existing design exists open defect, this transparent display needs environment light source to assist when switching to clear state.That is, in the application of current Transparence Display, all need to support that object shows with the surround lighting at display screen rear.Therefore, cause whole display device structure comparatively complicated, can only be applied to the large piece articles such as refrigerator-freezer, cabinet, lamp box, the more difficult thin display part that is applied in, as in mobile phone, PAD, notebook computer (Notebook), limits it and applies further.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention is: how to provide a kind of reflecting plate and transparent display, to overcome the dependence of transparent display to surround lighting, simplifies 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 is arranged at the liquid crystal layer between described first substrate and second substrate;
Liquid crystal molecule in described liquid crystal layer is cholesteric phase.
Wherein, described liquid crystal layer also comprises chiral additives, and described chiral additives is mixed between described liquid crystal molecule.
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 wavelength that the light of reflection selected by described reflecting plate, and Δ n is the birefraction of described liquid crystal molecule.
Wherein, described first substrate comprises: the first underlay substrate, is arranged on the first transparent electrode layer of the close described liquid crystal layer side of described first underlay substrate;
Described second substrate comprises: the second underlay substrate, is arranged on the second transparent electrode layer of the close described liquid crystal layer side of described second underlay substrate;
Described first transparent electrode layer and the second transparent electrode layer are for the formation of the electric field of TEXTURE STATE changing described liquid crystal molecule.
Wherein, described first substrate also comprises, and is arranged on the first oriented layer of the close described liquid crystal layer side of described first transparent electrode layer;
Described second substrate also comprises, and is arranged on the second oriented layer of the close described liquid crystal layer side of described second transparent electrode layer;
Described first oriented layer and the second oriented layer are used for carrying out antiparallel orientations to described liquid crystal molecule.
The present invention also provides a kind of transparent display comprising 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 described light guide plate being provided with site;
Described display screen is arranged on the light emission side of described light guide plate;
Described light source is arranged on the incident side of described light guide plate.
Wherein, described light guide plate adopts nanometer light guide plate.
Wherein, described transparent display also comprises: pcb board, mainboard and power panel;
The power signal line of described reflecting plate is all directly connected with described pcb board with control signal wire;
The power signal line of described display screen is all directly connected with described pcb board with control signal wire;
The power signal line of described backlight is all directly connected with described pcb board with control signal wire;
The power signal line of described pcb board is connected with described mainboard with control signal wire;
The power signal line of described mainboard is connected with described power panel.
Wherein, described pcb board is provided with the timing controller for controlling display screen scanning-line signal and data line signal output;
The timing control signal that described timing controller exports coordinates with the switch-over control signal for controlling described reflecting plate, switches with the change of display frame to make described transparent display between Transparence Display state and nontransparent display state.
Wherein, described pcb board, mainboard and power panel are arranged on the region outside the Transparence Display region of described transparent display.
(3) beneficial effect
Reflecting plate of the present invention and transparent display, liquid crystal molecule in cholesteric phase is set in reflecting plate, by changing the TEXTURE STATE of this liquid crystal molecule, transparent display can be made to switch between Transparence Display and nontransparent display, and when Transparence Display antireflection part light as backlight, the other a part of light of transmission simultaneously as environment light source, thus when auxiliary without environment light source, can realize the flexible switching of Transparence Display and nontransparent display; And, owing to eliminating environment light source auxiliary equipment, thus simplify the device architecture of transparent display, make it more lightening, be conducive to this transparent display being applied to mobile phone, PAD(panel computer), Notebook(notebook computer) etc. in smallclothes electronic product.
Accompanying drawing explanation
Fig. 1 a and Fig. 1 b is a kind of existing transparent display and displaying principle schematic diagram;
Fig. 2 a and Fig. 2 b is reflecting plate and the index path thereof of the embodiment of the present invention 1;
Fig. 2 c is the structural representation of the reflecting plate of the embodiment of the present invention 1;
Fig. 3 a is the partial structurtes schematic diagram of the transparent display of the embodiment of the present invention 2;
Fig. 3 b is the circuit connection diagram of the transparent display of the embodiment of the present invention 2.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
The present invention program, while realizing Transparence Display and normal display switching, eliminates environment light source auxiliary equipment, simplifies device architecture, transparent display can be made to be applied in thin display part further, extend the practical application of Transparence Display.Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
Embodiment 1
In order to realize, can Transparence Display be realized without during environment light source, need doing to optimize further to back light source structure and optical design, the invention provides a kind of reflecting plate.This reflecting plate has following feature:
1), during Transparence Display, this reflecting plate can use as the backlight of display screen by antireflection part light, and the other a part of light of transmission uses as environment light source;
2), during nontransparent display, this reflecting plate can use as the backlight of display screen by reflect most light, and scattering part light is gone out.
Fig. 2 a and Fig. 2 b is reflecting plate and the index path thereof of the embodiment of the present invention 1, and wherein, described reflecting plate comprises: first substrate 221, second substrate 222, and is arranged at the liquid crystal layer 230 between described first substrate 221 and second substrate 222.Liquid crystal molecule in described liquid crystal layer 230 is cholesteric phase.
Liquid crystal molecule in cholesteric phase, for left-handed to liquid crystal molecule or dextrorotation to liquid crystal molecule.For left-handed to liquid crystal molecule, under planar texture state, this liquid crystal molecules parallel arranges planar, but in adjacent plane, the direction of orientation of liquid crystal molecule slightly changes, normal direction along plane does spiral fashion variation, and the distance that direction of orientation experiences 360 ° of changes is called spiral shell square P.The left-handed Bragg reflection carrying out a part to liquid crystal molecule to incident light like this, reflected light is left circularly polarized light, and transmission right-circularly polarized light, thus achieve selective reflecting.
In order to set the wavelength X of the light selecting reflection, a kind of is preferred embodiment the chiral additives mixing predetermined concentration C in described liquid crystal molecule, the pitch P of described liquid crystal molecule can be changed by adding described chiral additives, and then change the wavelength X that the light of reflection selected by described reflecting plate.
When λ mono-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, by arranging the described chiral additives of variable concentrations in the zones of different of described liquid crystal layer 230, the pitch Distribution value in gradient of the liquid crystal molecule of zones of different in described liquid crystal layer 230 can be made, and then can realize reflecting the light in predetermined wavelength range.Like this, selecting the wavelength coverage of the light of reflection to be greater than the wavelength coverage of the light that described light source sends by arranging described liquid crystal layer 230, the utilization factor to the light that light source sends can be improved.
Wherein, the described chiral additives arranging variable concentrations in the zones of different of described liquid crystal layer 230 can adopt UV-irradiation to adulterate the liquid crystal molecule of described chiral additives, polymerisable monomer, the potpourri that UV absorbers and light trigger are formed, because described chiral additives its molecular diffusion rates under different ultraviolet ray intensities is different, the concentration of chiral additives described in the liquid crystal molecule near ultraviolet source place can be made higher, away from ultraviolet source place liquid crystal molecule described in the concentration of chiral additives lower, and by the polymerization of polymerisable monomer, the pitch of the cholesteric liquid crystal of zones of different is fixed, thus define the liquid crystal pitch gradient distribution of comparatively stable zones of different.The formation of cholesteric liquid crystal pitch gradient distribution 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 side of described first substrate 221a, and be arranged on the first oriented layer 221c of close described liquid crystal layer 230 side of described first transparent electrode layer 221b.
Described second substrate 222 is identical with described first substrate 221 structure, it comprises: the second underlay substrate, be arranged on the second transparent electrode layer of close described liquid crystal layer 230 side of described second underlay substrate, and be arranged on second oriented layer of close described liquid crystal layer 230 side of described second transparent electrode layer.
Wherein, described first transparent electrode layer 221b and the second transparent electrode layer are for the formation of the electric field of TEXTURE STATE changing described liquid crystal molecule.Described first oriented layer 221c and the second oriented layer are used for carrying out antiparallel orientations to described liquid crystal molecule.It should be noted that, described first oriented layer 221c and the second oriented layer also can be omitted, and other modes at this moment can be adopted to carry out antiparallel orientations to described liquid crystal molecule, such as adopt illumination methods.
Below the principle of work of reflecting plate described in the embodiment of the present invention is described as follows:
See Fig. 2 a, still suppose that the liquid crystal molecule in described liquid crystal layer 230 is left-handed to liquid crystal molecule, after (namely under non-power status) the first oriented layer and the second oriented layer carry out antiparallel orientations to it by default, described left-handed to liquid crystal molecule be planar texture, under this TEXTURE STATE, the described left-handed incident light that can send light source 210 to liquid crystal molecule carries out the Bragg reflection of a part, reflected light is left circularly polarized light, and transmitted light is right-circularly polarized light, thus realize selective reflecting.The left circularly polarized light of reflection shines display screen more uniformly after light guide plate, can as the backlight of display screen; And the right-circularly polarized light be transmitted, surround lighting can be provided, therefore, the object at screen rear can be seen.
See Fig. 2 b, when by described first transparency electrode and the second transparency electrode to described left-handed apply electric field to liquid crystal molecule time, the described left-handed molecule texture to liquid crystal molecule becomes focal conic texture, liquid crystal molecule becomes the state of arbitrarily distribution, through described left-handed to liquid crystal molecule, scattering and reflection can be there is in the light of light source 210.Owing to there is scattering, the object at display screen rear cannot be seen clearly; And the light of reflection, display backlight still can be provided, thus achieve nontransparent display.
Reflecting plate described in the present embodiment, by changing the TEXTURE STATE of the liquid crystal molecule in cholesteric phase, when auxiliary without environment light source, can realize the flexible switching of Transparence Display and nontransparent display.Meanwhile, reflecting plate described in the present embodiment is Transparence Display state when non-energized, is conducive to the power consumption reducing transparent display.
Embodiment 2
Fig. 3 a is the partial structurtes schematic diagram of the transparent display of the embodiment of the present invention 2, and as shown in Figure 3 a, described transparent display, except comprising the reflecting plate 340 described in embodiment 1, also comprises: light guide plate 320, light source 330 and display screen 310.
Concrete, described reflecting plate 340 is set in parallel in the side described light guide plate 320 being provided with site; Described display screen 310 is set in parallel in the light emission side of described light guide plate 320; Described light source 330 is arranged on the incident side of described light guide plate 320.
Wherein, described light guide plate 320 needs to have higher transmitance, can adopt the saturating light guide plate of ultra-thin height, preferably adopts nanometer light guide plate.Described light guide plate 320 is generally edge-type light guide plate.Described backlight 330 can adopt LED(light emitting diode) 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 present invention 2, and as shown in Figure 3 b, described transparent display comprises further: PCB(printed circuit board (PCB)) plate 350, mainboard 360 and power panel 370.
Concrete, the power signal line of described reflecting plate 340 is all directly connected with described pcb board 350 with control signal wire; The power signal line of described display screen 310 is all directly connected with described pcb board 350 with control signal wire; The power signal line of described backlight 330 is all directly connected with described pcb board 350 with control signal wire.The power signal line of described pcb board 350 is connected with described mainboard 360 with control signal wire; The power signal line of described mainboard 360 is connected with described power panel 370.
Wherein, described pcb board 350 is provided with T-con timing controller, described T-con timing controller is for controlling display screen scanning-line signal and data line signal output.The switching of described reflecting plate 340 between Transparence Display state and nontransparent display state, mainly control whether to cut off or provide power supply to realize by switch-over control signal, therefore, as long as an external power supply switch, or the light activated switch of a built-in band infrared remote receiver, carry out switching by the infrared remote control switch of outside and control.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 carried out being integrated into a control chip, the timing control signal that described timing controller can be made to export by this control chip for controlling the switch-over control signal of described reflecting plate, and then makes described transparent display switch between Transparence Display state and nontransparent display state with the change of display frame.Such as, when display frame is goldfish travelling in water, switches to Transparence Display state, thus make the background of the outdoor scene such as algae, cobble as above-mentioned display frame at transparent display rear, to build the display effect that actual situation combines; And when display frame is grassland scene, switches to nontransparent display device, show according to common display mode.
In the present embodiment, described mainboard 360 is arranged on same circuit board with described power panel 370 is integrated, to improve the integrated level of described display device, reduces its volume.Described transparent display can be the 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 are preferably arranged on the region outside the Transparence Display region of described transparent display, such as put into the vacant periphery of the display screen of mobile phone or PAD, or the base of display, or the keyboard lower zone etc. of notebook computer.
Reflecting plate described in the embodiment of the present invention and transparent display, liquid crystal molecule in cholesteric phase is set in reflecting plate, by changing the TEXTURE STATE of this liquid crystal molecule, transparent display can be made to switch between Transparence Display and nontransparent display, and when Transparence Display antireflection part light as backlight, the other a part of light of transmission simultaneously as environment light source, thus when auxiliary without environment light source, can realize the flexible switching of Transparence Display and nontransparent display; And, owing to eliminating environment light source auxiliary equipment, thus simplify the device architecture of transparent display, make it more lightening, be conducive to this transparent display being applied to mobile phone, PAD(panel computer), Notebook(notebook computer) etc. in smallclothes electronic product.
Above embodiment is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.

Claims (8)

1. comprise a transparent display for reflecting plate, it is characterized in that, described reflecting plate comprises: first substrate, second substrate, and is arranged at the liquid crystal layer between described first substrate and second substrate;
Liquid crystal molecule in described liquid crystal layer is cholesteric phase,
Described transparent display also comprises: light guide plate, light source and display screen;
Described reflecting plate is arranged on the side described light guide plate being provided with site;
Described display screen is arranged on the light emission side of described light guide plate;
Described light source is arranged on the incident side of described light guide plate.
2. transparent display as claimed in claim 1, is characterized in that, described light guide plate adopts nanometer light guide plate.
3. transparent display as claimed in claim 1, it is characterized in that, described transparent display also comprises: pcb board, mainboard and power panel;
The power signal line of described reflecting plate is all directly connected with described pcb board with control signal wire;
The power signal line of described display screen is all directly connected with described pcb board with control signal wire;
The power signal line of described light source is all directly connected with described pcb board with control signal wire;
The power signal line of described pcb board is connected with described mainboard with control signal wire;
The power signal line of described mainboard is connected with described power panel.
4. transparent display as claimed in claim 3, is characterized in that,
Described pcb board is provided with the timing controller for controlling display screen scanning-line signal and data line signal output;
The timing control signal that described timing controller exports coordinates with the switch-over control signal for controlling described reflecting plate, switches with the change of display frame to make described transparent display between Transparence Display state and nontransparent display state.
5. the transparent display as described in claim 3 or 4, is characterized in that, described pcb board, mainboard and power panel are arranged on the region outside the Transparence Display region of described transparent display.
6. transparent display as claimed in claim 1, it is characterized in that, described liquid crystal layer also comprises chiral additives, and described chiral additives is mixed between described liquid crystal molecule.
7. transparent display as claimed in claim 1, is characterized in that,
Described first substrate comprises: the first underlay substrate, is arranged on the first transparent electrode layer of the close described liquid crystal layer side of described first underlay substrate;
Described second substrate comprises: the second underlay substrate, is arranged on the second transparent electrode layer of the close described liquid crystal layer side of described second underlay substrate;
Described first transparent electrode layer and the second transparent electrode layer are for the formation of the electric field of TEXTURE STATE changing described liquid crystal molecule.
8. transparent display as claimed in claim 7, is characterized in that,
Described first substrate also comprises, and is arranged on the first oriented layer of the close described liquid crystal layer side of described first transparent electrode layer;
Described second substrate also comprises, and is arranged on the second oriented layer of the close described liquid crystal layer side of described second transparent electrode layer;
Described first oriented layer and the second oriented layer are used for carrying out antiparallel orientations to described liquid crystal molecule.
CN201310151739.8A 2013-04-27 2013-04-27 Transparent display device Active CN103217827B (en)

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PCT/CN2013/089599 WO2014173148A1 (en) 2013-04-27 2013-12-16 Baffle board and transparent display apparatus

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