CN105892057A - Polymer multilayer film-based holographic color diffraction head-up display device - Google Patents
Polymer multilayer film-based holographic color diffraction head-up display device Download PDFInfo
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- CN105892057A CN105892057A CN201610321320.6A CN201610321320A CN105892057A CN 105892057 A CN105892057 A CN 105892057A CN 201610321320 A CN201610321320 A CN 201610321320A CN 105892057 A CN105892057 A CN 105892057A
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- multilayer film
- light source
- led light
- storage medium
- diffraction
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0141—Head-up displays characterised by optical features characterised by the informative content of the display
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0149—Head-up displays characterised by mechanical features
- G02B2027/015—Head-up displays characterised by mechanical features involving arrangement aiming to get less bulky devices
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
- G02B2027/0174—Head mounted characterised by optical features holographic
Abstract
The invention relates to a polymer multilayer film-based holographic color diffraction head-up display device. The polymer multilayer film-based holographic color diffraction head-up display device includes a diffraction screen, a multilayer film recording medium, a liquid crystal light modulator, a first beam splitting prism, a first attenuation sheet, a first beam expanding lens group, a first LED light source, a second beam splitting prism, a second attenuation sheet, a second beam expanding lens group, a second LED light source and an LED driving power source; and reflection-type holographic body gratings are recorded in the multilayer film recording medium. According to the polymer multilayer film-based holographic color diffraction head-up display device provided by the invention, coherent light of different wavelengths interferes each other; the reflection-type holographic body gratings are recorded in the multilayer film recording medium; images are loaded through the liquid crystal light modulator; the different wavelengths are adjusted, light intensity is read out; image information required to be displayed is diffracted onto a screen through the reflection-type holographic body gratings; light of different colors reads the gratings simultaneously; and therefore, color images can be displayed clearly.
Description
Technical field
The invention belongs to holography field, particularly relate to a kind of holographic colour based on polymer multilayer film and spread out
Penetrate head-up display.
Background technology
Along with development in science and technology, the head up displays being used primarily for military field fighter plane the most progressively extends to civil area.
Head up displays can make pilot need not viewing instrument of bowing, and the windshield glass through aircraft both can observe external rings
Border, directly can be shown to information on glass simultaneously, be very beneficial to the operation that pilot carries out being correlated with.Civil area can be by
Head up displays is placed on the windshield glass of automobile, and human pilot just can be seen while observing pavement behavior intuitively
Other information such as the travel speed examining automobile, it is simple to driver operates vehicle quickly.Therefore head up displays has widely
Application potential and development prospect.
In head-up display, head up displays part based on Principle of Grating Diffraction is at most paid attention to.Rely on due to simple
The reflection of glass surface film realizes information and shows and can there is the significant drawbacks such as reflectance is little, contrast is low, so that display effect
Really extreme difference.If by etching or sticking one layer of phase type diffraction grating at glass surface, according to Principle of Grating Diffraction, in visual field
In just can with higher brightness show information, this is most important for head up displays, and this kind of mode is extensively used at present
In all types of head up displays parts.But it was found that current most of head up displays while display information
Being solid color, this is owing to the diffraction grating fringe spacing of etching is fixed, and is limited to the constant spacing grating manually etched,
Therefore it is difficult to develop the reflective gratings simultaneously with stronger diffracting power to multi-wavelength.Additionally for increasing transmitance, it is impossible to
Change and the grating fringe by multiplex mode increase different spacing.For enabling information to clearly show, people's more options are to people
The green-yellow light of eye more sensitivity mostly is single green as diffraction light, the head up displays that therefore we are seen.But for
For the display information observing display for a long time the operator equalling aobvious observation scenery external through diffraction, the display color of dullness
Coloured silk is very easy to cause visual fatigue, so that the keen reduction that driver is to display information.
Summary of the invention
In order to solve the problems referred to above, it is an object of the invention to provide a kind of holographic colour based on polymer multilayer film and spread out
Penetrate head-up display.
In order to achieve the above object, based on polymer multilayer film the holographic colored diffraction that the present invention provides looks squarely display dress
Put and include: diffraction screen, internal record have the multilayer film record medium of reflective holographic body grating, liquid crystal light modulator, first
Amici prism, the first attenuator, the first extender lens group, the first LED light source, the second Amici prism, the second attenuator, the second expansion
Bundle battery of lens, the second LED light source and LED drive power；Wherein the first LED light source, the first extender lens group, the first attenuator and
First Amici prism standoff distance from right to left arranges in a row, and the emission port of the first LED light source expands in the face of first
Mirror group；Second LED light source, the second extender lens group, the second attenuator and the second Amici prism are arranged from the right side from left standoff distance
In a row, the emission port of the second LED light source is in the face of the second extender lens group, and the second Amici prism is positioned at the first Amici prism
Dead ahead；Liquid crystal light modulator is transversely arranged on rear side of the first Amici prism；Multilayer film record medium is arranged on liquid crystal light-modulating
On rear side of device processed, and it is 45 degree of angles with liquid crystal light modulator；Diffraction screen is arranged on and is able to receive that multilayer film record medium spreads out
Penetrate the multilayer film record media side of light；First LED light source and the second LED light source electrically connect with LED drive power simultaneously.
The first described LED light source and the centre wavelength of the second LED light source are respectively 532nm and 633nm.
Described multilayer film record medium is gathered by acrylamide polymer upper strata storage medium and polymethyl methacrylate
Compound underlying storage medium forms；Wherein acrylamide polymer upper strata storage medium following component composition in parts by weight:
Poly methyl methacrylate polymer underlying storage medium is made up of following component by weight:
Described SiO2The average diameter of particle is 15nm.
The preparation method of described multilayer film record medium is: first using according to above-mentioned weight weighing as photosensitizer
Phenanthrenequione, the azodiisobutyronitrile as thermal initiator and the methyl methacrylate as thermotropic polymerization monomer are blended, and then exist
Making its mix homogeneously by supersonic oscillations at 50 DEG C and fully dissolve each other, then placement afterwards filters for 30 minutes to produce precipitation,
By SiO2Nanoparticle join filtration after clear liquor in and make mixed liquor, above-mentioned mixed liquor is warming up to 55 DEG C, and holds
Continuous sonic oscillation 5 minutes, then stops oscillation, moves to afterwards, in collar plate shape glass mold, be warming up to 65 DEG C, maintain this temperature also
Solidify 48 hours in drying baker and make underlying storage medium blank, finally utilize aluminum oxide polishing powder to exist above-mentioned blank
Use buffing machine to carry out surface finish under the rotating speed of 300-500r/min, thus make underlying storage medium；
Using according to the methylene blue dye as photosensitizer of above-mentioned weight weighing, the acrylamide as monomer, as
The triethanolamine of chain-transferring agent and the NN methylene-bisacrylamide as cross-linking agent are blended by deionized water；Will be as substrate
The polyvinyl alcohol of material weighs, and joining preparation in the deionized water of additionally preparation, to become the clarification of 10% mass volume ratio molten
Liquid, then mixes this settled solution with blends described above, under magnetic stirring apparatus continuously stirred 30 minutes and make
Blended liquid, stands 10 minutes and gets rid of bubble, and then above-mentioned blended liquid is uniformly applied to carry out lower floor's storage of surface finish
Dielectric surface, places 36-48 hour, i.e. makes multilayer film record Jie with wideband sensitive capability after solvent natural drying
Matter.
Based on polymer multilayer film the holographic colored diffraction head-up display that the present invention provides is for having wide suction
The photopolymer material characteristics of receipts scope and design, the coherent light of different wave length can be interfered by it, and by reflective entirely
Breath body grating is recorded in inside multilayer film photopolymer, simultaneously by liquid crystal light modulator load image, adjusts different wave length
Read light intensity, it would be desirable to the image information of display is diffracted on screen by reflective gratings, and the light of different colours is read simultaneously
Take grating such that it is able to clearly demonstrate colorful image.It addition, character based on multilayer film record medium, utilizing should
The high-transmission rate of medium and high-diffraction efficiency, load on inside visual field by display information while observing outside through medium, can
The holographic colored diffraction realizing fine definition is flat aobvious.
Accompanying drawing explanation
Based on polymer multilayer film the holographic colored diffraction head-up display schematic diagram that Fig. 1 provides for the present invention.
Poly methyl methacrylate polymer underlying storage medium in the multilayer film record medium that Fig. 2 provides for the present invention
Absorption spectra.
The absorption spectra of the multilayer film record medium that Fig. 3 provides for the present invention.
The reflective holographic body grating green glow diffraction spectrum of the multilayer film record medium that Fig. 4 provides for the present invention.
The reflective holographic body grating HONGGUANG diffraction spectrum of the multilayer film record medium that Fig. 5 provides for the present invention.
Detailed description of the invention
Based on polymer multilayer film the holographic colored diffraction with specific embodiment, the present invention provided below in conjunction with the accompanying drawings
Head-up display is described in detail.
As it is shown in figure 1, based on polymer multilayer film the holographic colored diffraction head-up display that the present invention provides includes:
Diffraction screen 1, internal record have the multilayer film record medium 2 of reflective holographic body grating, liquid crystal light modulator the 3, first light splitting
Prism the 4, first attenuator the 5, first extender lens group the 6, first LED light source the 7, second Amici prism the 8, second attenuator 9, second
Extender lens group the 10, second LED light source 11 and LED drive power 12；Wherein first LED light source the 7, first extender lens group 6,
One attenuator 5 and the first Amici prism 4 standoff distance from right to left arrange in a row, and the transmitting actinal surface of the first LED light source 7
To the first extender lens group 6；Second LED light source the 11, second extender lens group the 10, second attenuator 9 and the second Amici prism 8 from
The right side arranges in a row from left standoff distance, the second extender lens group 10 faced by the emission port of the second LED light source 11, and second point
Light prism 8 is positioned at the first Amici prism 4 dead ahead；Liquid crystal light modulator 3 is transversely arranged on rear side of the first Amici prism 4；Many
Tunic record medium 2 is arranged on rear side of liquid crystal light modulator 3, and with liquid crystal light modulator 3 in 45 degree of angles；Diffraction screen 1
It is arranged on multilayer film record medium 2 side being able to receive that multilayer film record medium 2 diffracted ray；First LED light source 7 and second
LED light source 11 electrically connects with LED drive power 12 simultaneously.
The first described LED light source 7 and the centre wavelength of the second LED light source 11 are respectively 532nm and 633nm, it is possible to
Change LED light source into LASER Light Source as required.
The holographic colored diffraction head-up display the operation principle now present invention provided is described below: by the first LED light
The centre wavelength that source 7 sends is that the light of 532nm first passes through the first extender lens group 6 and expands, then will by the first attenuator 5
Light intensity decays, and then enters the first Amici prism 4；The light that centre wavelength is 633nm sent by the second LED light source 11 is first
Expand through the second extender lens group 10, then by the second attenuator 9, light intensity is decayed, then enter the second light splitting
Prism 8, after through the light beam of the second Amici prism 8 reflection through the light launched with the first LED light source 7 after the first Amici prism 4
Overlap, and incide liquid crystal light modulator 3 surface together, after liquid crystal light modulator 3 load image, with reflective gratings
Bragg coupling angle incides multilayer film record medium 2, the reflective holographic body grating diffraction in multilayer film record medium 2,
The image of the information of carrying is projected directly on diffraction screen 1 and shows, or by naked eyes direct viewing, be just obtained in that
Clearly, the diffraction image of high brightness.
Embodiment 1:
The multilayer film record medium 2 that the present embodiment provides records medium and by acrylamide polymer upper strata storage medium and gathers
Methyl methacrylate polymer underlying storage medium forms；Wherein acrylamide polymer upper strata storage medium is by weight
Following component forms:
Underlying storage medium is made up of following component by weight:
Preparation method: the preparation method of described multilayer film record medium 2 is: first by the work according to above-mentioned weight weighing
Phenanthrenequione for photosensitizer, the azodiisobutyronitrile as thermal initiator and the methyl methacrylate as thermotropic polymerization monomer are total to
Mixed, then at 50 DEG C, make its mix homogeneously by supersonic oscillations and fully dissolve each other, placement afterwards 30 minutes to produce precipitation,
Then filter, be the SiO of 15nm by average diameter2Nanoparticle join filtration after clear liquor in and make mixed liquor, will
Above-mentioned mixed liquor is warming up to 55 DEG C, and continual ultrasonic vibrates 5 minutes, then stops oscillation, moves to collar plate shape glass mold afterwards
In, it is warming up to 65 DEG C, maintains this temperature and solidify 48 hours in drying baker and make underlying storage medium blank, finally by upper
Stating blank utilizes aluminum oxide polishing powder to use buffing machine to carry out surface finish under the rotating speed of 300r/min, thus makes lower floor and deposits
Storage media, thickness range is 500 microns to 3 millimeters；
Using according to the methylene blue dye as photosensitizer of above-mentioned weight weighing, the acrylamide as monomer, as
The triethanolamine of chain-transferring agent and the NN methylene-bisacrylamide as cross-linking agent are blended by deionized water；Will be as substrate
The polyvinyl alcohol of material weighs, and joining preparation in the deionized water of additionally preparation, to become the clarification of 10% mass volume ratio molten
Liquid, then mixes this settled solution with blends described above, under magnetic stirring apparatus continuously stirred 30 minutes and make
Blended liquid, stands 10 minutes and gets rid of bubble, and then above-mentioned blended liquid is uniformly applied to carry out lower floor's storage of surface finish
Dielectric surface, places 36-48 hour, i.e. makes the multilayer film record medium with wideband sensitive capability after solvent natural drying
2。
Embodiment 2:
The multilayer film record medium 2 that the present embodiment provides is by acrylamide polymer upper strata storage medium and polymethyl
Acid methacrylate polymer underlying storage medium composition；Wherein acrylamide polymer upper strata storage medium following component by weight
Composition:
Underlying storage medium is made up of following component by weight:
Preparation method is with embodiment 1.
Embodiment 3:
The multilayer film record medium 2 that the present embodiment provides is by acrylamide polymer upper strata storage medium and polymethyl
Acid methacrylate polymer underlying storage medium composition；Wherein acrylamide polymer upper strata storage medium following component by weight
Composition:
Underlying storage medium is made up of following component by weight:
Preparation method is with embodiment 1.
Poly methyl methacrylate polymer underlying storage medium in the multilayer film record medium 2 that Fig. 2 provides for the present invention
Absorption spectra, as can be seen from the figure this underlying storage medium has higher photosensitive absorption to wavelength less than the laser of 600nm
Ability.This material is suitable under 532nm laser recording grating.The absorption of the multilayer film record medium 2 that Fig. 3 provides for the present invention
Spectrum.Compared with the absorption spectra of above-mentioned underlying storage medium, it can be clearly seen that two peaks occurs in the absorption of multilayer film record medium 2
Value, one identical with underlying storage medium, and another one is in the range of 600nm-700nm.This is due to acrylamide polymer
Upper strata storage medium is a kind of polymeric material to red light sensitiveness, and therefore multilayer film record medium 2 can be applicable to two kinds not
The laser of co-wavelength records holographic body grating respectively.
Reflective gratings diffraction spectra can characterize the diffracting power of holographic body grating.The multilayer film that Fig. 4 provides for the present invention
The reflective holographic body grating green glow diffraction spectrum of record medium.This diffraction spectrum is by the green quick material of underlying storage medium
The optical grating diffraction of portion's record is measured.This it appears that the diffraction peak of this spectrum is in green range.By suitably adjusting
Optical grating diffraction angle diffraction wavelength can be made just to mate the first LED light source 7 that centre wavelength is 532nm.This spectrum simultaneously
Peak half width is narrower, is very suitable for single wavelength is carried out diffraction.The veiling glare of other wavelength can be filtered well.
The reflective holographic body grating HONGGUANG diffraction spectrum of the multilayer film record medium that Fig. 5 provides for the present invention.This diffraction
Spectrum is to be measured by the optical grating diffraction of the red quick material internal record of upper strata storage medium.This it appears that its diffraction maximum
Value position is directly directed at 633nm, also has narrower peak half width simultaneously, therefore, it is possible to diffraction He-Ne laser wave well
Long.The diffraction spectrum of this upper strata storage medium shows to be suitable for HONGGUANG is carried out diffraction.
Claims (5)
1. a holographic colored diffraction head-up display based on photopolymer, it is characterised in that: comprising: diffraction screen
(1), internal record has multilayer film record medium (2) of reflective holographic body grating, liquid crystal light modulator (3), the first light splitting rib
Mirror (4), the first attenuator (5), the first extender lens group (6), the first LED light source (7), the second Amici prism (8), the second decay
Sheet (9), the second extender lens group (10), the second LED light source (11) and LED drive power (12)；Wherein the first LED light source (7),
First extender lens group (6), the first attenuator (5) and the first Amici prism (4) standoff distance from right to left arrange in a row, and
And first the emission port of LED light source (7) in the face of the first extender lens group (6)；Second LED light source (11), the second extender lens group
(10), the second attenuator (9) and the second Amici prism (8) arrange in a row from the right side from left standoff distance, the second LED light source (11)
Emission port in the face of the second extender lens group (10), and the second Amici prism (8) is positioned at the first Amici prism (4) dead ahead；
Liquid crystal light modulator (3) is transversely arranged on the first Amici prism (4) rear side；Multilayer film record medium (2) is arranged on liquid crystal light
Manipulator (3) rear side, and with liquid crystal light modulator (3) in 45 degree of angles；Diffraction screen (1) is arranged on and is able to receive that multilayer film
Multilayer film record medium (2) side of record medium (2) diffracted ray；First LED light source (7) and the second LED light source (11) are same
Time electrically connect with LED drive power (12).
Holographic colored diffraction head-up display based on photopolymer the most according to claim 1, it is characterised in that:
Described the first LED light source (7) and the centre wavelength of the second LED light source (11) are respectively 532nm and 633nm.
Holographic colored diffraction head-up display based on photopolymer the most according to claim 1, it is characterised in that:
Described multilayer film record medium (2) is by under acrylamide polymer upper strata storage medium and poly methyl methacrylate polymer
Layer storage medium composition；Wherein acrylamide polymer upper strata storage medium following component composition in parts by weight:
Poly methyl methacrylate polymer underlying storage medium is made up of following component by weight:
。
Holographic colored diffraction head-up display based on photopolymer the most according to claim 3, it is characterised in that:
Described SiO2The average diameter of nanoparticle is 15nm.
Holographic colored diffraction head-up display based on photopolymer the most according to claim 3, it is characterised in that:
The preparation method of described multilayer film record medium (2) is: first using according to above-mentioned weight weighing the phenanthrenequione as photosensitizer,
Azodiisobutyronitrile as thermal initiator and the methyl methacrylate as thermotropic polymerization monomer are blended, then at 50 DEG C
Making its mix homogeneously by supersonic oscillations and fully dissolve each other, then placement afterwards filters, by SiO for 30 minutes to produce precipitation2
Nanoparticle join filtration after clear liquor in and make mixed liquor, above-mentioned mixed liquor is warming up to 55 DEG C, and continual ultrasonic
Vibrate 5 minutes, then stop oscillation, move to afterwards, in collar plate shape glass mold, be warming up to 65 DEG C, maintain this temperature and be dried
Solidify 48 hours in case and make underlying storage medium blank, finally utilize aluminum oxide polishing powder at 300-above-mentioned blank
Using buffing machine to carry out surface finish under the rotating speed of 500r/min, thus make underlying storage medium, thickness range is 500 microns
To 3 millimeters；
Using according to above-mentioned weight weighing the methylene blue dye as photosensitizer, the acrylamide as monomer, turn as chain
Move the triethanolamine of agent and the NN methylene-bisacrylamide as cross-linking agent is blended by deionized water；Will be as base material
Polyvinyl alcohol weigh, and join preparation in the deionized water of additionally preparation and become the settled solution of 10% mass volume ratio,
Then this settled solution is mixed with blends described above, under magnetic stirring apparatus continuously stirred 30 minutes and make blended
Liquid, stands 10 minutes and gets rid of bubble, then above-mentioned blended liquid is uniformly applied to carry out the underlying storage medium of surface finish
Surface, places 36-48 hour, i.e. makes the multilayer film record medium 2 with wideband sensitive capability after solvent natural drying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610321320.6A CN105892057B (en) | 2016-05-16 | 2016-05-16 | A kind of colored diffraction head-up display of holography based on polymer multilayer film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610321320.6A CN105892057B (en) | 2016-05-16 | 2016-05-16 | A kind of colored diffraction head-up display of holography based on polymer multilayer film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105892057A true CN105892057A (en) | 2016-08-24 |
| CN105892057B CN105892057B (en) | 2018-08-31 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610321320.6A Expired - Fee Related CN105892057B (en) | 2016-05-16 | 2016-05-16 | A kind of colored diffraction head-up display of holography based on polymer multilayer film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111352242A (en) * | 2018-12-21 | 2020-06-30 | 乐金显示有限公司 | Display device for realizing virtual image |
| US10809435B2 (en) | 2017-08-07 | 2020-10-20 | Boe Technology Group Co., Ltd. | Backlight unit, method for manufacturing the same and display device |
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| CN2539054Y (en) * | 2002-04-27 | 2003-03-05 | 孙大璋 | Reflecting holographic colour lighting implement |
| CN1424829A (en) * | 2002-12-13 | 2003-06-18 | 北京工业大学 | Stage linked body holographic grating intensive WDM implement manufacture and system thereof |
| WO2004013677A1 (en) * | 2002-08-05 | 2004-02-12 | Nikon Corporation | Image combiner and image display unit |
| CN102246084A (en) * | 2008-12-09 | 2011-11-16 | 德尔菲技术公司 | Diffractive head-up display device provided with a device for adjusting the position of the virtual image |
| CN104581121A (en) * | 2015-01-27 | 2015-04-29 | 李雨顺 | Laser holographic all-digital color television system and laser holographic reflected wave zone plate wave pattern acquisition and reproduction method |
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2016
- 2016-05-16 CN CN201610321320.6A patent/CN105892057B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2539054Y (en) * | 2002-04-27 | 2003-03-05 | 孙大璋 | Reflecting holographic colour lighting implement |
| WO2004013677A1 (en) * | 2002-08-05 | 2004-02-12 | Nikon Corporation | Image combiner and image display unit |
| CN1424829A (en) * | 2002-12-13 | 2003-06-18 | 北京工业大学 | Stage linked body holographic grating intensive WDM implement manufacture and system thereof |
| CN102246084A (en) * | 2008-12-09 | 2011-11-16 | 德尔菲技术公司 | Diffractive head-up display device provided with a device for adjusting the position of the virtual image |
| CN104581121A (en) * | 2015-01-27 | 2015-04-29 | 李雨顺 | Laser holographic all-digital color television system and laser holographic reflected wave zone plate wave pattern acquisition and reproduction method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10809435B2 (en) | 2017-08-07 | 2020-10-20 | Boe Technology Group Co., Ltd. | Backlight unit, method for manufacturing the same and display device |
| CN111352242A (en) * | 2018-12-21 | 2020-06-30 | 乐金显示有限公司 | Display device for realizing virtual image |
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| Publication number | Publication date |
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| CN105892057B (en) | 2018-08-31 |
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