CN207424476U - LCOS back lighting devices and AR display devices - Google Patents
LCOS back lighting devices and AR display devices Download PDFInfo
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- CN207424476U CN207424476U CN201721632525.2U CN201721632525U CN207424476U CN 207424476 U CN207424476 U CN 207424476U CN 201721632525 U CN201721632525 U CN 201721632525U CN 207424476 U CN207424476 U CN 207424476U
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Abstract
The utility model provides a kind of LCOS back lighting devices and AR display devices, wherein, LCOS back lighting devices include the light guide plate, diffusion sheet, prismatic lens and the polarization splitting prism that are arranged in order and arranged on the polarization splitting prism polarised light light direction LCOS display chips；Reflective lenticule is distributed on the optical surface away from diffusion sheet on the light guide plate, transmission-type lenticule is distributed on the optical surface of the diffusion sheet；Illuminating ray is diffused in through the diffusion sheet on the prismatic lens after light guide plate homogenizes, then converges to the polarization splitting prism through the prismatic lens, for entering the LCOS display chips after the polarization splitting prism polarization.LCOS back lighting devices and AR display devices provided by the utility model, illuminating ray uniform irradiation to be made to reduce the weight and volume of LCOS display devices while on LCOS chip so that the more lightweight and miniaturization of AR display devices.
Description
Technical field
The utility model is related to augmented reality field more particularly to a kind of LCOS back lighting devices and AR display devices.
Background technology
LCOS (Liquid Crystal on Silicon, the attached silicon of liquid crystal) is that a kind of very small size of matrix liquid crystal is shown
Showing device.LCOS cannot from main light emission, it is necessary to using polarised light come illuminate its display chip can just show different grayscale and
The picture of color.
In the prior art, generally use light source, such as LED (Light Emitting Diode, light emitting diode)
And polarization splitting prism (polarization beam splitter, PBS) builds the illumination path of LCOS.In the illumination light
Lu Zhong, the light that light source is sent is radiated at after PBS prismatic reflections and polarization on the display chip of LCOS, so as to show
Go out the picture of different grayscale and color.
To ensure the uniform illumination degree of LCOS display devices, in the prior art, increase usually in LCOS display devices and use
In the lens group or diffusion barrier of even light.But it is above-mentioned can be caused by the way of lens group or diffusion barrier LCOS display devices tool compared with
Big weight and volume.Therefore, a kind of new LCOS display devices urgently propose.
Utility model content
The many aspects of the utility model provide a kind of LCOS back lighting devices and AR display devices, to make illuminating ray
Uniform irradiation reduces the weight and volume of LCOS display devices while on LCOS chip so that AR display devices are more
Lightweight and miniaturization.
The utility model provides a kind of LCOS back lighting devices, including：
The light guide plate, diffusion sheet, prismatic lens and the polarization splitting prism polarization splitting prism that are arranged in order and arranged on described
The LCOS display chips of the light direction of the polarised light of polarization splitting prism；
Reflective lenticule is distributed on the optical surface away from diffusion sheet on the light guide plate, close to the diffusion sheet
Transmission-type lenticule is distributed on optical surface；
Illuminating ray is diffused in through the diffusion sheet on the prismatic lens after light guide plate homogenizes, then through the prism
Piece converges to the polarization splitting prism, for entering the LCOS display chips after the polarization splitting prism polarization.
Still optionally further, further include：Parallel to the reflection of the optical surface away from the diffusion sheet on the light guide plate
Mirror, the speculum is for reflection through the light that the light guide plate leaks to the light guide plate.
Still optionally further, it is smaller than 0.5mm between the light guide plate and the speculum.
Still optionally further, the light guide plate is Wedge shape light conduction board, and close to the light of the diffusion sheet on the light guide plate
It is parallel with the optical surface close to the diffusion sheet on the polarization splitting prism to learn surface.
Still optionally further, the wedge angle of the Wedge shape light conduction board is 3 °~8 °.
Still optionally further, the reflective lenticule includes：The equally distributed multiple hemispherical reflectivity mirrors of array, it is described
The spherical surface of hemispherical reflectivity mirror is close to the diffusion sheet；
The transmission-type lenticule includes：The equally distributed multiple hemisphere diaphotoscopes of array, the hemisphere diaphotoscope
Spherical surface is close to the diffusion sheet.
Still optionally further, a diameter of 0.5mm of the hemispherical reflectivity mirror and/or the hemisphere diaphotoscope.
Still optionally further, the prismatic lens includes：Two orthogonally located prismatic lenses.
Still optionally further, the overall thickness of two orthogonally located prismatic lenses is 0.5mm.
The utility model also provides a kind of AR display devices, including LCOS back lighting devices provided by the utility model.
In the utility model, LCOS back lighting devices mainly include light guide plate, diffusion sheet and prismatic lens, and light guide plate
Lenticule is distributed on two optical surfaces, in such back lighting device, illuminating ray homogenizes first through light guide plate, and
It is diffused in by diffusion sheet on prismatic lens, then polarization splitting prism is converged to through prismatic lens, be finally equably radiated at LCOS and show
Show on chip.The primary optics of above-mentioned composition LCOS back lighting devices, optical property is good, and have the characteristics that it is light, thin,
And then the weight and volume of LCOS display devices can be reduced in illuminating ray uniform irradiation while on LCOS chip,
So that AR display devices more lightweight and miniaturization.
Description of the drawings
Attached drawing described herein is used to provide a further understanding of the present invention, and forms one of the utility model
Point, the schematic description and description of the utility model is not formed for explaining the utility model to the utility model
Improper restriction.In the accompanying drawings：
Fig. 1 is the structure diagram for the LCOS back lighting devices that one embodiment of the utility model provides；
Fig. 2 a are the structure diagram for the LCOS back lighting devices that another embodiment of the utility model provides；
Fig. 2 b are the structure diagram for the light guide plate 10 that one embodiment of the utility model provides；
Fig. 3 is Illumination Distribution signal of the LCOS back lighting devices that provide of the utility model embodiment on LCOS display chips
Figure；
Fig. 4 is illumination spot surplus of the LCOS back lighting devices that provide of the utility model embodiment on LCOS display chips
Schematic diagram；
Fig. 5 is the angle of illumination spot of the LCOS back lighting devices that provide of the utility model embodiment on LCOS display chips
Spend distribution schematic diagram.
Specific embodiment
It is specific below in conjunction with the utility model to make the purpose of this utility model, technical solution and advantage clearer
Technical solutions of the utility model are clearly and completely described in embodiment and corresponding attached drawing.Obviously, described embodiment
Only it is the utility model part of the embodiment, instead of all the embodiments.Based on the embodiment in the utility model, this field
Those of ordinary skill's all other embodiments obtained without making creative work, belong to the utility model
The scope of protection.
Fig. 1 is the structure diagram for the LCOS back lighting devices that one embodiment of the utility model provides.As shown in Figure 1, the dress
Put including：
The light guide plate 10, diffusion sheet 11, prismatic lens 12 and the polarization splitting prism PBS13 that are arranged in order and arranged on PBS13
Polarised light light direction LCOS display chips 14.
Wherein, reflective lenticule is distributed on the optical surface away from diffusion sheet 11 on light guide plate 10, close to diffusion sheet
Transmission-type lenticule is distributed on 11 optical surface.The light for reaching the optical surface away from diffusion sheet 11 on light guide plate 10 can be with
It is equably reflexed in light guide plate 10 by the reflective lenticule again, to improve the service efficiency of light, reduces light source
Power consumption.
The light of the optical surface of close diffusion sheet 11 on light guide plate 10 is reached, it can be by the transmission-type lenticule uniform transillumination
It to diffusion sheet 11, is diffused in through diffusion sheet 11 on prismatic lens 12, then PBS13 is converged to through prismatic lens 12.PBS13 will be incident to
Light thereon is irradiated into LCOS display chips 14 after carrying out polarization, and then, LCOS display chips 14 can show different ashes
Rank and the picture of color.
Optionally, the LED of long lifespan and low energy consumption may be employed in light source 100, with reduce the cost of lighting device with
And energy consumption.
Optionally, the light mode that enters of light guide plate 10 can be that side formula enters light or straight-down negative enters light.Wherein, side formula
Enter light as shown in Figure 1, light source can be positioned over the side of light guide plate 10；When straight-down negative enters light, light source can be positioned over and lead
On the downside of tabula rasa, that is, non-light emission side.Of course it is to be understood that it is only a kind of example that side formula shown in FIG. 1, which enters light, this practicality
It is new actually realize during, side formula may be employed for light guide plate 10 and enter light, can also light be entered using straight-down negative, not
It is limited by attached drawing citing.
Wherein, the optical surface of diffusion sheet 11 has irregular micro structure, and by diffusion sheet 11 diffusing transmission can occur for light.From
The high angle scattered light that light guide plate 10 is emitted, after diffusion sheet 11, can change as diffuse transmission light vertical with the incidence surface of PBS13
Line.
Wherein, prismatic lens 12, also referred to as prism film BEF (Brightness Enhancement Film).Go out through diffusion sheet 11
After the light penetrated is by prismatic lens 12, light angle further reduces so that the luminous energy in the range of special angle is more concentrated.
Wherein, PBS13 can be formed by a pair of of high-precision right-angle prism gluing, be coated on the inclined-plane of one of right-angle prism
Incident non-polarized light can be divided into the orthogonal linearly polarized light of two beams by polarization spectro deielectric-coating, the polarization spectro deielectric-coating.
Wherein horizontal polarization light (P light) is completely by the way that and orthogonal polarized light (S light) is gone out with 45 degree of corner reflections, that is to say, that S polarisations
The exit direction of exit direction and P polarisations is into an angle of 90 degrees.Therefore, the light direction of the polarised light of PBS13 can be institute in Fig. 1
The light direction of the P polarisations shown or the light direction of S polarisations.LCOS display chips 14 can be arranged on the light extraction of P light
Side, can also be arranged on the light emission side of S light, and the utility model embodiment is without limitation.
In the utility model, LCOS back lighting devices mainly include light guide plate, diffusion sheet and prismatic lens, and light guide plate
Lenticule is distributed on two optical surfaces, in such back lighting device, illuminating ray homogenizes first through light guide plate, and
It is diffused in by diffusion sheet on prismatic lens, then PBS is converged to through prismatic lens, be finally equably radiated on LCOS chip.It is above-mentioned
The primary optics of LCOS back lighting devices are formed, optical property is good, and has the characteristics that light, thin, and then can shine
Mingguang City's line uniform irradiation is while on LCOS chip so that the more lightweight and miniaturization of LCOS display devices.
In an optional embodiment, as shown in Figure 2 a, LCOS back lighting devices provided by the utility model further include：It is parallel
In the speculum 15 of the optical surface away from diffusion sheet 11 on light guide plate 10.Speculum 15 leaks for reflecting through light guide plate 10
Light to light guide plate 10.In fig. 2 a, light source is located at the side of light guide plate 10, enters light using side formula, into light guide plate 10
Light during the constantly reflection of the inside of light guide plate 10, may there are the light that fractional transmission is gone out.This fractional transmission is gone out
Light, can be reflected back light guide plate 10 by speculum 15, and then improve the light utilization efficiency of LCOS back lighting devices.
In an optional embodiment, as shown in Fig. 1 and Fig. 2 a, light guide plate 10 can be Wedge shape light conduction board.Light guide plate
Optical surface on 10 close to diffusion sheet 11 is parallel with the optical surface close to diffusion sheet 11 on PBS13.In other words, if LCOS is carried on the back
Optical element in electro-optical device is to set from top to bottom, then the lower surface of light guide plate 10 is parallel to the upper surface of PBS13.
Optionally, the wedge angle of light guide plate 10 be 3 °~8 °, this angular range can ensure light can equably according to
It is mapped on LCOS display chips 14.Preferably, in the present embodiment, the wedge angle of light guide plate 10 is 5 °, to ensure that light has
Better uniformity.
Optionally, in the present embodiment, the reflective lenticule on light guide plate 10 on the optical surface away from diffusion sheet 11
Including：The equally distributed multiple hemispherical reflectivity mirrors of array as shown in Figure 2 b, the spherical surface of hemispherical reflectivity mirror is close to diffusion sheet 11.
Wherein, reflectivity can be coated on the spherical surface of each hemispherical reflectivity mirror close to 1 reflective medium film.And then it is reached with any angle
The light of 10 upper half ball mirror of light guide plate can equably reflex to light guide plate by hemispherical reflectivity mirror with minimum optical energy loss
In 10, the service efficiency of light is further improved.
Optionally, transmission-type lenticule includes：The equally distributed multiple hemisphere diaphotoscopes of array as shown in 2b, hemisphere
The spherical surface of diaphotoscope is close to diffusion sheet 11.Hemisphere diaphotoscope enables to be incident to light thereon with any angle with smaller
The angle of divergence and higher energy are emitted on diffusion sheet 11.Optionally, anti-reflection medium can be plated on the spherical surface of hemisphere diaphotoscope
Film, so that the light reached on light guide plate 10 on the optical surface of diffusion sheet 11 continues to propagate with higher light utilization efficiency.
Wherein, optionally, the diameter of hemispherical reflectivity mirror and/or hemisphere diaphotoscope can be 0.5mm.It should be appreciated that 0.5mm
The representative value that simply the utility model embodiment provides, under this representative value, the difficulty of processing of light guide plate 10 is imitated with guide-lighting
Fruit reaches balance.Certainly, in other alternative embodiments, the diameter of hemispherical reflectivity mirror and/or hemisphere diaphotoscope can be other
Value, the utility model are without limitation.
In an optional embodiment, prismatic lens 12 includes orthogonally located the first prismatic lens and the second prismatic lens.First
The placement angle of prismatic lens and the second prismatic lens is mutually perpendicular to, and then, it can further reduce light in 2 orthogonal directions
Line shooting angle improves the concentration degree for being incident on the luminous energy on PBS13.
Optionally, in the present embodiment, the thickness of speculum 15 is chosen as 0.3mm, and the spacing between light guide plate 10 can
To be less than 0.5mm.The thickness of light guide plate is chosen as 1.5mm, and the thickness of diffusion sheet 11 is chosen as 0.2mm, and two orthogonally located
The overall thickness of prismatic lens is chosen as 0.5mm.And then in LCOS backlight modules provided in this embodiment, except PBS13 and LCOS
Outside display chip 14, the integral thickness of the optical system of other optical elements composition is controlled within 3mm, is greatly reduced
The volume of LCOS back lighting devices.In addition, above-mentioned optical element material is light, small, is more conducive to LCOS back lighting devices
Lightweight.
Fig. 3 is Illumination Distribution signal of the LCOS back lighting devices that provide of the utility model embodiment on LCOS display chips
Scheme, the transverse and longitudinal coordinate XY in Fig. 3 represents the size of LCOS display chips, and unit is millimeter, LCOS display chips region
Different gray scales represent different illumination.From figure 3, it can be seen that the illumination spot of LCOS back lighting devices provided by the utility model exists
There is good distributing homogeneity on LCOS display chips.
Fig. 4 is illumination spot surplus of the LCOS back lighting devices that provide of the utility model embodiment on LCOS display chips
Schematic diagram.As shown in figure 4, illumination spot has sufficient illumination surplus, and the distribution of surplus on LCOS display chips 15
Meet the shape of LCOS display chips 15, surplus is very uniform in the distribution of surrounding, ensure that installation positioning and part tolerance
Range of tolerable variance.
Fig. 5 is the angle of illumination spot of the LCOS back lighting devices that provide of the utility model embodiment on LCOS display chips
Spend distribution schematic diagram, as shown in figure 5, LCOS back lighting devices formed half light intensity angular distribution of illumination spot control ± 15 ° it
It is interior, it ensure that the efficiency of light energy utilization after the angle automatching for the imaging optical path arranged in pairs or groups with it, improve total after imaging optical path
Light efficiency.
The utility model also provides a kind of AR display devices, using LCOS back lighting devices provided by the utility model, has
The characteristics of small and light-weight.
The above description is only the embodiments of the present invention, is not intended to limit the utility model.For this field
For technical staff, various modifications and changes may be made to the present invention.All institutes within the spirit and principle of the utility model
Any modification, equivalent substitution, improvement and etc. of work, should be included within the right of the utility model.
Claims (10)
1. a kind of LCOS back lighting devices, which is characterized in that including：
The light guide plate, diffusion sheet, prismatic lens and the polarization splitting prism that are arranged in order and arranged on the inclined of the polarization splitting prism
Shake light light direction LCOS display chips；
Reflective lenticule is distributed on the optical surface away from diffusion sheet on the light guide plate, close to the optics of the diffusion sheet
Transmission-type lenticule is distributed on surface；
Illuminating ray is diffused in through the diffusion sheet on the prismatic lens after light guide plate homogenizes, then is converged through the prismatic lens
Gather to the polarization splitting prism, for entering the LCOS display chips after the polarization splitting prism polarization.
2. the apparatus according to claim 1, which is characterized in that further include：Parallel to the separate expansion on the light guide plate
The speculum of the optical surface of discrete piece, the speculum is for reflection through the light that the light guide plate leaks to the light guide plate.
3. the apparatus of claim 2, which is characterized in that be smaller than between the light guide plate and the speculum
0.5mm。
4. the apparatus according to claim 1, which is characterized in that the light guide plate is Wedge shape light conduction board, and the light guide plate
The upper optical surface close to the diffusion sheet is parallel with the optical surface close to the diffusion sheet on the polarization splitting prism.
5. device according to claim 4, which is characterized in that the wedge angle of the Wedge shape light conduction board is 3 °~8 °.
6. according to device according to any one of claims 1 to 5, which is characterized in that the reflective lenticule includes：Array
The equally distributed multiple hemispherical reflectivity mirrors of formula, the spherical surface of the hemispherical reflectivity mirror is close to the diffusion sheet；
The transmission-type lenticule includes：The equally distributed multiple hemisphere diaphotoscopes of array, the spherical surface of the hemisphere diaphotoscope
Close to the diffusion sheet.
7. device according to claim 6, which is characterized in that the hemispherical reflectivity mirror and/or the hemisphere diaphotoscope
A diameter of 0.5mm.
8. according to device according to any one of claims 1 to 5, which is characterized in that the prismatic lens includes：Two orthogonal to put
The prismatic lens put.
9. device according to claim 8, which is characterized in that the overall thickness of two orthogonally located prismatic lenses is
0.5mm。
10. a kind of AR display devices, which is characterized in that including LCOS backlights dress such as according to any one of claims 1 to 9
It puts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721632525.2U CN207424476U (en) | 2017-11-29 | 2017-11-29 | LCOS back lighting devices and AR display devices |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721632525.2U CN207424476U (en) | 2017-11-29 | 2017-11-29 | LCOS back lighting devices and AR display devices |
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| CN207424476U true CN207424476U (en) | 2018-05-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175654A (en) * | 2021-04-16 | 2021-07-27 | 尹松 | Optical structure and lamps and lanterns of polarisation illumination |
-
2017
- 2017-11-29 CN CN201721632525.2U patent/CN207424476U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113175654A (en) * | 2021-04-16 | 2021-07-27 | 尹松 | Optical structure and lamps and lanterns of polarisation illumination |
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Effective date of registration: 20201020 Address after: 261031 north of Yuqing street, east of Dongming Road, high tech Zone, Weifang City, Shandong Province (Room 502, Geer electronic office building) Patentee after: GoerTek Optical Technology Co.,Ltd. Address before: 266104 Laoshan Qingdao District North House Street investment service center room, Room 308, Shandong Patentee before: GOERTEK TECHNOLOGY Co.,Ltd. |