CN108919531A - AR display system based on liquid-crystal zoom lens - Google Patents
AR display system based on liquid-crystal zoom lens Download PDFInfo
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- CN108919531A CN108919531A CN201810882092.9A CN201810882092A CN108919531A CN 108919531 A CN108919531 A CN 108919531A CN 201810882092 A CN201810882092 A CN 201810882092A CN 108919531 A CN108919531 A CN 108919531A
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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
- G02F1/1313—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 specially adapted for a particular application
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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
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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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
-
- 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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
- G02F1/294—Variable focal length devices
Abstract
The AR display system based on liquid-crystal zoom lens that the invention discloses a kind of, including：Micro-display generates image light；Polarizing film is polarized image light to form polarization light；Liquid crystal display controls to form that focal length is variable and Phase Equivalent is in the liquid crystal lens of lens by computer；Semi-transparent semi-reflecting lens are coated with polarizing coating；Polarization light part is reflected into liquid crystal lens；Environment light forms environment polarised light by polarizing coating, into liquid crystal lens；Computer is loaded into image to micro-display, while controlling the distribution of liquid crystal display electrode voltage, adjusts the focal length of the liquid crystal lens, and polarization light is corresponded to deep focus imaging in human eye；Polarization light is e light in liquid crystal lens, and environment polarised light is o light in liquid crystal lens.AR display system of the invention can realize more depth stereoscopic displays of virtual image, solve the problems, such as influx conflict, and the AR display system architectures are simple, practical, have important application value.
Description
Technical field
The present invention relates to augmented reality display field more particularly to a kind of AR display systems based on liquid-crystal zoom lens.
Background technique
Augmented reality (Augmented Reality, abbreviation AR) is a kind of by optical system, by micro-display device
Such as DMD, the image of the displays such as LCD carries out imaging and is supplied to human eye viewing, at the same the scene in actual environment it is interference-free into
Enter a kind of display technology of human eye.Its core is to merge virtual scene with real scene, and it is new to provide interactive one kind
Type display technology.The technology is expected to imparting knowledge to students, military training, medicine, and many aspects such as biology obtain application, studies at present
One hot spot technology problem.
In augmented reality, virtual scene and being perfectly combined for true scene are a core contents.In general feelings
Helmet displaying scheme, the i.e. image of micro display device generation are used under condition, eyepiece are entered after semi-transparent semi-reflecting eyeglass, later
Into human eye, the image that micro display device generates forms an intensified image by eyepiece.And the scene in actual environment, first lead to
It crosses after a compensating eyepiece by semi-transparent semi-reflecting lens, using eyepiece, the imaging system of compensating eyepiece and eyepiece composition, by environment
In scene equal proportion be imaged to human eye.To which miniature display can also be perceived while making one to perceive true environment
The image for the amplification that device generates realizes AR displaying scheme.
Which AR displaying scheme is by biocular systems, it can be achieved that binocular solid AR is shown.The shortcomings that display mode is：
System complex；In order to eliminate distortion, eyepiece and compensating eyepiece are generally more lens combination modes, bulky；In addition the program
The depth fixation of shown virtual image is uncontrollable, and there are influx conflict when binocular solid is shown, people can be allowed for a long time by wearing
Generate dizziness.
The Chinese patent literature of Publication No. CN107894666A discloses a kind of more depth stereo-pictures of wear-type and shows
3-D image is resolved into the pixel of different depth by light field algorithm by system, the display system, and it is multiple right to project respectively
It answers and is shown on the planar wave unit of depth, to realize that more depth light fields are shown, solve influx and adjust asking for conflict
Topic.
The Chinese patent literature of Publication No. CN107748442A discloses a kind of enhancing that can be switched fast picture depth
Reality display device, the display device can be generated by the adjusting of the depth adjuster of several stacked distributions from people in space
The eye distance of distinct vision to infinity depth image, it can be achieved that true 3 d light fields shows, efficiently solve vision influx and adjust and conflict,
Improve the experience of user.
But above two display system is respectively necessary for the planar wave unit or depth adjuster of several stacked distributions, institute
It is larger to account for volume, higher cost.
Summary of the invention
For effective solution influx conflict, and sufficient simplied system structure, the present invention provides one kind to be based on liquid crystal
The AR display system of zoom lens.
The present invention provides following technical solutions：
A kind of AR display system based on liquid-crystal zoom lens, including：
Micro-display is amplitude type display device, generates image light；
Described image light is polarized in polarizing film, forms polarization light；
Liquid crystal display controls the distribution of its electrode voltage by computer, and formation focal length is variable and Phase Equivalent is in the liquid of lens
Brilliant lens；
Semi-transparent semi-reflecting lens, are coated with polarizing coating, and described image polarised light part is reflected into the liquid crystal by semi-transparent semi-reflecting lens
Lens；Environment light is polarized to form environment polarised light by polarizing coating, and environment polarised light part enters institute after penetrating semi-transparent semi-reflecting lens
State liquid crystal lens；
Computer is loaded into image to micro-display, while controlling the distribution of liquid crystal display electrode voltage, adjusts the liquid crystal lens
Focal length, by polarization light human eye correspond to deep focus imaging；
Described image polarised light is orthogonal with the polarization direction of environment polarised light；Polarization light is in the liquid crystal lens
E light is modulated by liquid crystal lens and is imaged；Environment polarised light is o light in the liquid crystal lens, and amount of phase modulation is constant.
The working principle of AR display system of the invention is as follows：
The image light that micro-display occurs is polarized by polarizing film, forms polarization light, polarization light is through semi-transparent semi-reflecting
Mirror front surface portion is reflected into liquid crystal display, the polarization direction of polarization light (principal plane in the principal plane of liquid crystal display：Light
The plane that the direction of propagation and liquid crystal optic axis direction are determined, wherein liquid crystal optic axis is the direction of long axis of liquid crystal molecule), it is e light；It is logical
The Electrode Field distribution for crossing computer control liquid crystal display, so that the liquid crystal molecule in liquid crystal display occurs partially in liquid crystal display principal plane
Turn, forms the liquid crystal lens of lens equivalent phase distribution, the refractive index of incident e light is modulated, e light is by liquid crystal lens at this time
After modulation, convergence enters human eye, and human eye sees that one is amplified by liquid crystal lens in the virtual image of distant place.It can be by changing electrode
Field distribution, modulates the focal length of liquid crystal lens, to make the virtual image forming of amplification in different depth.
Environment light is polarized by the subsequent polarizing coating of semi-transparent semi-reflecting lens, forms environment polarised light, and environment polarised light part is saturating
Enter liquid crystal display after crossing semi-transparent semi-reflecting lens, the polarization direction of environment polarised light is o light, folding perpendicular to the principal plane of liquid crystal display
It is unrelated with the direction of propagation to penetrate rate.For o light, liquid crystal shields thoroughly only just corresponds to a transparent glass plate, and environment light can
Uninterruptedly to enter human eye, it is not distorted, to make one to see clearly the scene in environment.
The imaging depth for quickly changing polarization light can be realized by the focal length of fast switching liquid crystal lens, realize empty
More depth stereoscopic displays of quasi- image, solve the problems, such as influx conflict, and AR display system architectures of the invention are simple, real
Border application value is higher.
The micro-display can be non-luminous display device, such as transmission type LCD, reflective DMD or reflective
LCOS needs light source to provide illumination light；It is also possible to self luminous display device, such as miniature OLED display screen, is not necessarily to volume at this time
Outer light source provides illumination, and system will be more compact.
A kind of technical solution is：The micro-display includes：
Light source is lighted, illuminated displays part for generating three coloured light by computer timing control three coloured light timesharing；
Display device is illuminated by light source, is loaded into image by computer, is modulated to form image to light source light
Light.
The display device is transmission type LCD, reflective DMD or reflective LCoS.
The light source includes red, green, blue led light source each one, the diverging light difference that each LED light source issues
Beam, illuminated displays part are closed by light combination mirror after collimated lens.
Specifically, after the diverging light that red, green, blue led light source issue is collimated collimated respectively, wherein a branch of
Light is totally reflected mirror reflection, and in addition two-beam is reflected by semi-transparent semi-reflecting lens, and three kinds of color of light are conduct after a light beam by conjunction beam
Illuminate optical illumination micro-display.Wherein, light beam is totally reflected mirror reflection, and in addition two-beam is reflected by semi-transparent semi-reflecting lens, there is three
Kind combining form, any one form can be achieved timesharing colour AR and show.
Another scheme is：Red, green, blue led light source are replaced with into red, green, blue laser light source respectively.
Another technical solution is：The micro-display is self luminous OLED display screen.It is not necessarily to additional photograph at this time
Mingguang City source is illuminated, and the optical path of system is more compact.
It, can be in the optical path using multiple mirrors of turning back in order to further make the compact-sized of AR display system.
Preferably, the liquid crystal display include the first glass substrate being cascading, ITO electrode layer, alignment layers, as
Plain structure electrode layer, the second glass substrate are filled with liquid crystal molecule between the alignment layers and dot structure electrode layer.
It is further preferred that the alignment layers are used to fix the direction of liquid crystal molecule.
In liquid crystal display production, by fur or silk according to certain orientation friction alignment layers, make to position layer surface formation one
The groove structure for determining direction, for fixing the direction of liquid crystal molecule.
It is further preferred that the position of the voltage's distribiuting mobile liquid crystal lens of liquid crystal display electrode can be changed by computer.
The voltage's distribiuting of liquid crystal display electrode can be changed by computer, thus mobile liquid crystal lens according to the needs of display
Position, the emergent pupil of AR display system can be expanded.
Compared with prior art, beneficial effects of the present invention are：
AR display system of the invention can be realized by the focal length of fast switching liquid crystal lens and quickly change polarization light
Imaging depth, realize more depth stereoscopic displays of virtual image, solve the problems, such as influx conflict, and AR of the invention is aobvious
Show that system structure is simple, practical application value is higher.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of 1 transmission-type AR display system of embodiment；
Fig. 2 is the structural schematic diagram for being coated with the semi-transparent semi-reflecting lens of polarizing coating below；
Fig. 3 is liquid crystal lens and the incident beam modulated schematic diagram；
Fig. 4 is the structural schematic diagram of the reflective AR display system of embodiment 2；
Fig. 5 is structural schematic diagram of the embodiment 3 using the AR display system of self-luminous miniscope.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawings and examples, it should be pointed out that reality as described below
It applies example to be intended to convenient for the understanding of the present invention, and does not play any restriction effect to it.
Embodiment 1
As shown in Figure 1, the present embodiment based on liquid-crystal zoom lens AR display system, to use non-luminescent transmission-type
System of the LCD as micro display device.
The AR display system includes red LED 1, green LED 2, blue led 3, collimation lens 4, collimation lens 5, collimates thoroughly
Mirror 6, total reflective mirror 7, semi-transparent semi-reflecting lens 8, semi-transparent semi-reflecting lens 9, LED controller 10, total reflective mirror 11, computer 12, transmission-type
LCD13, polarizing film 14, the back side is coated with the semi-transparent semi-reflecting lens 15 of polarizing coating and liquid crystal LC16 is formed.
Wherein E is user's eyes position, and 17 pass through polarizing film 14 and half for what is issued by micro display device LCD
Polarization light after saturating semi-reflective mirror 15 is indicated with solid line.And 18 are coated with the semi-transparent semi-reflecting of polarizing film for ambient light transmission
Environment polarised light after mirror 15, is indicated with dashed lines.
LED controller 10, micro display device transmission type LCD 13 and liquid crystal LC16 are controlled by computer 12.
The diverging light that red LED 1, green LED 2, blue led 3 issue is collimated lens 4, collimation lens 5, collimation respectively
Lens 6 are converted into plane wave, are totally reflected mirror 11 instead after closing beam by total reflective mirror 7, semi-transparent semi-reflecting lens 8, semi-transparent semi-reflecting lens 9 respectively
Penetrate, illuminate transmission type LCD 13, computer 12 to transmission type LCD 13 be loaded into display image, by transmission type LCD 13 light again
Through polarizing film 14, polarization state is located in xoz plane, enters liquid crystal LC16, liquid crystal LC16 after the reflection of semi-transparent semi-reflecting lens 15
Its distribution of electrodes is controlled by computer 12, forms liquid crystal lens.
The polarization direction of polarization light 17 is located in xoz plane, and xoz plane is light direction of propagation z and liquid crystal molecule
The plane that long axis is determined, is principal plane, polarization light 17 enter liquid crystal after be e light, by the phase-modulation of liquid crystal lens,
E point is converged at, human eye can be observed to image in the virtual image of the amplification of distant place.Environment light is coated with semi-transparent the half of polarizing coating through the back side
After anti-mirror 15, polarization direction is perpendicular to xoz plane, and into after liquid crystal LC16, polarization direction is perpendicular to liquid crystal principal plane
O light, refractive index is constant, is directed through liquid crystal LC16, is equivalent to by a plate glass.Human eye can watch in the position E
By the scene in the virtual image and environment of liquid crystal LC16 amplification projection, realize that AR is shown.
In actual displayed, red, green, blue LED timesharing is lighted, and synchronous loading in micro display device transmission type LCD 13
The channel images with different colors of color image realizes colored display by way of timing.
Fig. 2 is the structural schematic diagram for the semi-transparent semi-reflecting lens 15 that the back side is coated with polarizing coating, is coated with the semi-transparent semi-reflecting lens of polarizing coating
15 are made of semi-transparent semi-reflecting lens 151 and polarizing coating 152, and polarizing coating 152 is plated in the lateral surface of semi-transparent semi-reflecting lens 151, only allow
Direction of vibration passes through perpendicular to the polarised light of xoz plane, i.e., environment light after being coated with the semi-transparent semi-reflecting lens 15 of polarizing film by forming
Polarised light of the polarization direction perpendicular to xoz plane.
The structure of liquid crystal LC16 is as shown in figure 3, by substrate of glass 161, ITO electrode 162, alignment layers 163, dot structure electricity
Pole 164 and liquid crystal molecule 165 form.In liquid crystal cell production, alignment layers are made to generate one according to a direction friction by silk
Determine the groove structure of whereabouts distribution, can making liquid crystal molecule, there are a fixed directions, the initial direction as liquid crystal molecule.?
Under the action of ITO electrode 162 and dot structure electrode 164, is controlled by outside, certain voltage's distribiuting is generated, so that liquid crystal
Molecule only generates rotation in xoz plane, is formed phase structure (liquid crystal lens).
Wherein 17 expressions is that polarization direction is parallel with liquid crystal principal plane, the image light from display device, in liquid crystal
Interior is e light, and the refractive index n on the direction of propagation is related with the corner α of optical axis, can be expressed as：
Wherein α is the corner of optical axis, the i.e. rotation angle (folder between long axis of liquid crystal molecule and direction of propagation z of liquid crystal molecule
Angle), on the face perpendicular to z-axis, it is n respectively that the refractive index of ordinary light o and abnormal light e, which are principal refractive index,oAnd ne, when liquid crystal material
After material determines, principal refractive index noAnd neFor known quantity.
Due to the rotation of liquid crystal molecule, for e light, caused phase delay can be expressed as：
Le=(n--nair)d (2)
Wherein, n is refractive index of the e light on its direction of propagation, shown in calculation formula such as formula (1)；nairFor air
Refractive index；D is the thickness of liquid crystal.Liquid crystal LC16 generates certain voltage's distribiuting, it can be achieved that equivalent lens phase by pixel electrode
Position modulation.The image light that will be shown on micro display device is imaged as the virtual image of an amplification at a distance.
Assuming that the distance of micro display device to liquid crystal lens is d1, and the focal length of the liquid crystal lens formed is f, then it is, full
Sufficient d1In the case where < f, the virtual image of amplification is realized, the position where the virtual image can be expressed as：
In actual displayed, the relative position of microdevice and liquid crystal LC16 is fixed, i.e. d1For fixed value, by adjusting electricity
Pressure, changes the focal length f of liquid crystal lens, image can be imaged on different depth.(such as by the focal length f of Fast transforms liquid crystal lens
Using blue phase liquid crystal, the refreshing of 180hz being realized, scene being projected into three depth, the refresh rate of corresponding human eye is 60hz, is such as divided
When color three dimension show the demand that human eye viewing is substantially met, it can be achieved that the color three dimension body of equivalent 20hz is shown), and it is synchronous
The image of corresponding depth is loaded into, it can be achieved that layered stereoscopic show, solution influx conflict.
Environment light forms environment polarised light 18, polarization direction is vertical through after being coated with the semi-transparent semi-reflecting lens 15 of polarizing coating
In xoz plane, it is expressed as by the phase delay after liquid crystal lens：
Lo=(no-nair)d (4)
noFor constant, generated phase delay is constant, therefore does not generate any phase-modulation, is equivalent to polarised light 18
Pass through a transparent plate.
Embodiment 2
As shown in figure 4, the present embodiment based on liquid-crystal zoom lens AR display system, be reflective using non-spontaneous light
System of the DMD or LCOS as micro display device.With example 1 the difference is that light source issue light by semi-transparent semi-reflecting lens 11
Divide reflection, indirect lighting micro display device DMD or LCOS, DMD or LCOS are loaded into image and are adjusted to reflected light, adjusted
Through after semi-transparent semi-reflecting lens 11 after the light reflection of system, enter liquid crystal after the semi-transparent semi-reflecting lens reflection of polarizing coating is coated with by the back side
LC16.Other parts and example 1 are consistent, repeat no more.
Example 3
As shown in figure 5, this example based on liquid-crystal zoom lens AR display system, to use self-luminous miniscope
The AR display system of OLED.OLED display 13 is controlled by computer 12, and computer 12 is by getImage OLED display device 13
On, the light issued is converted into the polarization direction polarised light parallel with xoz plane, is coated with partially by the back side after polarizing film 14
15 front surface portion of semi-transparent semi-reflecting lens of vibrating diaphragm is reflected into liquid crystal LC16, is modulated by liquid crystal lens, and light converges at human eye E
It sets.And after environment light is coated with the semi-transparent semi-reflecting lens 15 of polarizing film through the back side, polarization direction is vertical with xoz plane, not by shadow
Enter human eye loudly, realizes that AR is shown.
The example is compared with embodiment 1 and embodiment 2, with the simple compact advantage of structure, applies valence with important
Value.
Technical solution of the present invention and beneficial effect is described in detail in embodiment described above, it should be understood that
Above is only a specific embodiment of the present invention, it is not intended to restrict the invention, it is all to be done in spirit of the invention
Any modification, supplementary, and equivalent replacement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of AR display system based on liquid-crystal zoom lens, which is characterized in that including：
Micro-display is amplitude type display device, generates image light；
Described image light is polarized in polarizing film, forms polarization light；
Liquid crystal display controls the distribution of its electrode voltage by computer, and formation focal length is variable and Phase Equivalent is saturating in the liquid crystal of lens
Mirror；
Semi-transparent semi-reflecting lens, are coated with polarizing coating, and described image polarised light part is reflected into the liquid crystal lens by semi-transparent semi-reflecting lens；
Environment light is polarized to form environment polarised light by polarizing coating, and environment polarised light part enters the liquid crystal after penetrating semi-transparent semi-reflecting lens
Lens；
Computer is loaded into image to micro-display, while controlling the distribution of liquid crystal display electrode voltage, adjusts the coke of the liquid crystal lens
Away from, by polarization light human eye correspond to deep focus imaging；
Described image polarised light is orthogonal with the polarization direction of environment polarised light；Polarization light is e light in the liquid crystal lens,
It is modulated and is imaged by liquid crystal lens；Environment polarised light is o light in the liquid crystal lens, and amount of phase modulation is constant.
2. the AR display system according to claim 1 based on liquid-crystal zoom lens, which is characterized in that the micro display
Device includes：
Light source is lighted, illuminated displays part for generating three coloured light by computer timing control three coloured light timesharing；
Display device is illuminated by light source, is loaded into image by computer, is modulated to form image light to light source light.
3. the AR display system according to claim 2 based on liquid-crystal zoom lens, which is characterized in that the display
Part is transmission type LCD, reflective DMD or reflective LCoS.
4. the AR display system according to claim 2 or 3 based on liquid-crystal zoom lens, which is characterized in that the light
Source includes red, green, blue led light source each one, and the diverging light that each LED light source issues is distinguished after collimated lens by closing
Shu Jinghe beam, illuminated displays part.
5. the AR display system according to claim 2 or 3 based on liquid-crystal zoom lens, which is characterized in that the light
Source includes red, green, blue laser light source each one, the diverging light that each laser light source issues distinguish after collimated lens by
Light combination mirror closes beam, illuminated displays part.
6. the AR display system according to claim 1 based on liquid-crystal zoom lens, which is characterized in that the micro display
Device is self luminous OLED display screen.
7. the AR display system according to claim 1 based on liquid-crystal zoom lens, which is characterized in that the liquid crystal display
Including the first glass substrate, ITO electrode layer, alignment layers, dot structure electrode layer, the second glass substrate being cascading,
Liquid crystal molecule is filled between the alignment layers and dot structure electrode layer.
8. the AR display system according to claim 7 based on liquid-crystal zoom lens, which is characterized in that the alignment layers
For fixing the direction of liquid crystal molecule.
9. the AR display system according to claim 1 based on liquid-crystal zoom lens, which is characterized in that computer can be passed through
Change the position of the voltage's distribiuting mobile liquid crystal lens of liquid crystal display electrode.
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