WO2020191534A1 - 一种高精度空气显示系统及方法 - Google Patents
一种高精度空气显示系统及方法 Download PDFInfo
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- WO2020191534A1 WO2020191534A1 PCT/CN2019/079303 CN2019079303W WO2020191534A1 WO 2020191534 A1 WO2020191534 A1 WO 2020191534A1 CN 2019079303 W CN2019079303 W CN 2019079303W WO 2020191534 A1 WO2020191534 A1 WO 2020191534A1
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- WIPO (PCT)
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- polarizing film
- polarized light
- reflective polarizing
- image generator
- wave plate
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
Definitions
- the invention relates to the field of aerial imaging, in particular to a high-precision air display system and method.
- the current aerial imaging is mostly divided into two forms: the first imaging method mainly uses Fresnel lens as the main technology to carry, using the principle of Fresnel condensing light to focus, converge the multi-angle light source of the screen at the same focal point. Cone-shaped divergence, the viewing angle is within the effective angle range, and the aerial imaging of the left and right eyes with the same focus can be received.
- the resulting image has accuracy, brightness, and flexibility.
- the second imaging method is to use a retro-reflective film to reflect the multi-angle light source of the screen on a semi-transparent and semi-reflective lens to the retro-reflective film, and the retro-reflective film returns the screen light source almost to the original path
- half of the returning light source passes through the semi-transparent mirror, and finally according to the core principle of air imaging, the light from the screen converges regularly in the air to present an observable image, but because the screen light source enters the semi-transparent second time
- the overall brightness is only 25% or less, which causes brightness problems.
- retro-reflective films are generally used in the field of road traffic safety. The accuracy of re-reflection is not high, which causes each pixel to retroreflect to its respective focal position. Offset occurs, causing blurring of pixels.
- the present invention provides a high-precision air display system, which can obtain an air imaging picture with high brightness and clear picture.
- a high-precision air display system including an image generator for emitting linearly polarized light.
- a reflective type with a linear polarization angle for reflecting the linearly polarized light emitted by the image generator is obliquely arranged above the image generator.
- Polarizing film, the polarization angle of the linearly polarized light emitted by the image generator and the polarization angle of the reflective polarizing film are perpendicular to each other; one side of the reflective polarizing film is provided for processing the linearly polarized light reflected by the reflective polarizing film Circularly polarized light wave plate and used to retro-reflect the circularly polarized light passing through the wave plate so that the retro-reflected light passes through the wave plate and the reflective polarizing film in turn, and focuses on the other side of the reflective polarizing film.
- the retroreflective film is provided for processing the linearly polarized light reflected by the reflective polarizing film Circularly polarized light wave plate and used to retro-reflect the circularly
- the retro-reflected circularly polarized light forms linearly polarized light with the same polarization angle as the reflective polarizing film when passing through the wave plate.
- the image generator is an OLED screen, an LED screen or a liquid crystal screen.
- the image generator emits linearly polarized light with a linear polarization angle of 90 degrees
- the reflective polarizing film has a linear polarization angle of 180 degrees
- the wave plate is a quarter wave plate
- the The retroreflective film is a highly retroreflective film.
- the angle between the wave plate and the image generator is 90°; the angle between the image generator and the reflective polarizing film is 45°; the reflective polarizing film and the wave plate The included angle is 45°.
- the present invention also provides a high-precision air display method, including the following steps:
- the image generator emits light with a linear polarization angle to a reflective polarizing film with a polarization angle arranged obliquely above the image generator; the linear polarization angle of the light emitted by the image generator and the reflective polarizing film The linear polarization angle is vertical;
- the reflective polarizing film reflects the linearly polarized light emitted from the image generator to the wave plate on the side of the reflective polarizing film to form circular polarized light;
- the image generator in step 1) emits light with a linear polarization angle of 90 degrees, and the linear polarization angle of the reflective polarizing film is 180 degrees;
- the wave plate in step 2) is a quarter wave plate,
- the reflective polarizing film reflects the linearly polarized light emitted from the image generator to the wave plate on the side of the reflective polarizing film to form a 135-degree circular polarized light; step 4) the 135-degree circular return in the original path
- the polarized light passes through the wave plate to form linearly polarized light of 180 degrees with the same polarization angle as the reflective polarizing film.
- the distance between the focus imaging position on the other side of the reflective polarizing film and the reflective polarizing film is d1
- the distance between the reflective polarizing film and the image generator is d2
- d1 d2.
- the image generator is an OLED screen, an LED screen or a liquid crystal screen.
- the beneficial effect of the present invention is: the present invention provides a high-precision air display system, a reflective polarizing film with a polarization angle reflects the polarized light with a linear polarization angle emitted by the image generator to the wave plate Circularly polarized light is formed.
- the retro-reflective film retroreflects the circularly polarized light to the wave plate.
- the wave plate converts the retro-reflected circularly polarized light into linearly polarized light with the same polarization angle as the reflective polarizer film.
- the polarized light passes through the reflective polarizing film to focus to form a high-brightness and clear air imaging picture for the viewer to view, so that the imaging picture is clear, and the visual experience is unprecedented.
- Figure 1 is a schematic diagram of a high-precision air display system provided by the present invention.
- Fig. 1 is a preferred embodiment of a high-precision air display system provided by the present invention.
- the high-precision air display system includes an image generator 10 for emitting linearly polarized light.
- the reflective polarizing film 20 that reflects polarized light, the polarization angle of the linearly polarized light emitted by the image generator 10 and the polarization angle of the reflective polarizing film 20 are perpendicular to each other; one side of the reflective polarizing film 20 is provided with a reflection type
- the linearly polarized light reflected by the polarizing film is processed to form a circularly polarized wave plate 30 and used to retroreflect the circularly polarized light passing through the wave plate 30 so that the retro-reflected light passes through the wave plate and the reflective polarizer in turn
- the retroreflective film 40 is focused on the other side of the reflective polarizing film.
- the retro-reflected circularly polarized light will form the same linear polarization as the reflective polarizer 20 when passing through the wave plate 30.
- the image generator 10 emits linearly polarized light with a linear polarization angle
- the reflective polarizing film 20 reflects the polarized light with the linear polarization angle emitted by the image generator 10 to the wave plate 30, and passes through the belt of the wave plate 30.
- the linearly polarized light with linear polarization angle changes its polarization properties and becomes circularly polarized light.
- the circularly polarized light continues to be emitted to the retroreflective film 40.
- the circularly polarized light Highly regressive retroreflected back to the original path.
- the retroreflected circularly polarized light passes through the wave plate again, its polarization properties change to linearly polarized light with the same polarization angle as the reflective polarizing film, and continue to follow the original path to the reflective type
- the polarizing film is retroreflected, because the polarization properties of the light at this time are equal to the reflective polarizing film, a large amount of light passes through, and finally converges to the focus position on the other side of the reflective polarizing film to form a high-brightness and clear air imaging picture for the viewer to view , In this way, the imaged picture is clear, and an unprecedented visual experience is obtained in the visual experience.
- the angle between the image generator 10 and the reflective polarizing film 20 is ⁇
- the angle between the reflective polarizing film and the wave plate is ⁇
- the angle between the wave plate and the image generator 10 is The angle is ⁇ , ⁇ + ⁇ + ⁇ is 180°; as a preferred preferred solution, ⁇ is 90°, and both ⁇ and ⁇ are 45°; as another preferred preferred solution, ⁇ , ⁇ and ⁇ are all 60°.
- the distance between the focus imaging position on the other side of the reflective polarizing film and the reflective polarizing film is d1
- the distance between the reflective polarizing film and the image generator is d2
- d1 d2.
- the image generator 10 emits linearly polarized light with a linear polarization angle of 90 degrees, and the reflective polarizing film 20 has a linear polarization angle of 180 degrees;
- the wave plate 30 is a quarter One wave plate, the retroreflective film 40 is a highly retroreflective film; as shown in Figure 1, an image generator 10 with a linear polarization angle of 90° is selected as the imaging light source, and the image generator 10 emits a 90° Linearly polarized light with polarization properties.
- the 135° circularly polarized light passes through the quarter wave plate again to generate polarization properties Change to 180° linearly polarized light, and continue to retro-reflect to the reflective polarizing film according to the original path, because the polarization property of the 180° linearly polarized light at this time is equal to that of the reflective polarizing film, and the 180° linearly polarized light After a large number of passes, it finally converges to the focal position in the air.
- the distance between this position and the reflective polarizing film is almost equal to the distance between the light source emission of the image generator and the reflective polarizing film.
- the cone shape converges to the focal position and then the cone shape scatters out, and the emission range covers the binocular eyes of the person at the observation angle. Because the left and right eyes of the binocular eyes capture the light from the same image generator but different light paths at the focal position. , Binocular human eyes see the image formed by the image generator from this focal position, achieving the effect of aerial imaging.
- a quarter wave plate is an anisotropic crystal sheet with a certain thickness that can convert plane polarized light into circularly polarized light, or vice versa.
- its vibration direction is at an angle ⁇ ( ⁇ 0) with the optical axis of the wafer.
- the incident light vibration is decomposed into two vibrations that are perpendicular to the optical axis (o vibration) and parallel to the optical axis (e vibration). These components correspond to the ordinary light (o light) and extraordinary light (e light) in the wafer.
- the ordinary light (o light) and extraordinary light (e light) in the wafer travel in the same direction, and the ordinary light (o light) and The phase difference between extraordinary light (e light) is equal to ⁇ /2 or its odd multiples.
- Such a wafer is called a quarter wave plate or a quarter wave plate.
- the quarter wave plate is attached to the retroreflective film and integrated.
- Polarized light passes through the quarter-wave plate, and the polarization properties of the light are changed: linearly polarized light passes through the quarter-wave plate and is converted into circularly polarized light; circularly polarized light passes through the quarter-wave plate and is converted into linear Type polarized light; meanwhile, the polarization angle is deflected by 45 degrees every time it passes.
- the image generator 10 is an OLED screen, an LED screen, a liquid crystal screen or other image generators with specific linear polarization properties on the surface.
- the present invention also provides a high-precision air display method, including the following steps:
- the image generator 10 emits light with a linear polarization angle to the reflective polarizing film 20 with a polarization angle arranged obliquely above the image generator 10; the linear polarization angle of the light emitted by the image generator 10 is the same as The linear polarization angle of the reflective polarizing film is vertical;
- the reflective polarizing film 20 reflects the linearly polarized light emitted by the image generator 10 to the wave plate 30 on the side of the reflective polarizing film to form circular polarized light;
- step 1) the image generator emits light with a linear polarization angle of 90 degrees, and the linear polarization angle of the reflective polarizing film is 180 degrees;
- the wave plate in step 2) is a quarter wave plate, and the reflection
- the polarizing film reflects the linearly polarized light emitted by the image generator to the wave plate on the side of the reflective polarizing film to form a circular polarized light of 135 degrees.
- Step 4) The 135-degree circularly polarized light returned from the original path passes through the wave plate again to form a 180-degree linearly polarized light with the same polarization angle as the reflective polarizing film.
- the image generator 10 is preferably an OLED screen, an LED screen or a liquid crystal screen.
- the distance between the focus imaging position on the other side of the reflective polarizing film and the reflective polarizing film is d1
- the distance between the reflective polarizing film and the image generator is d2
- d1 d2.
- the technical solution of the present invention can fully and effectively achieve the above-mentioned purpose of the invention, and the structure and functional principles of the present invention have been fully verified in the embodiments, and can achieve the expected effect and purpose without departing from the original Under the premise of the principle and essence of the invention, various changes or modifications can be made to the embodiments of the invention. Therefore, the present invention includes all replacements within the scope mentioned in the scope of the patent application, and any equivalent changes made within the scope of the patent application of the present invention fall within the scope of the patent application in this case.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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- Electroluminescent Light Sources (AREA)
Abstract
Description
Claims (10)
- 一种高精度空气显示系统,其特征在于,包括用于发射线性偏振光的图像发生器,图像发生器的上方倾斜设有具有线性偏振角度的用于对图像发生器发射过来的线性偏振光进行反射的反射式偏光膜,图像发生器发出的线性偏振光的偏振角度与反射式偏光膜的偏振角度互相垂直;反射式偏光膜的一侧设有用于对经过反射式偏光膜反射过来的线性偏振光进行处理形成圆型偏振光的波片以及用于对经过波片的圆型偏振光进行逆反射使得逆反射回的光线依次穿过波片和反射式偏光膜并在反射式偏光膜的另一侧聚焦成像的逆反射膜。
- 根据权利要求1所述的高精度空气显示系统,其特征在于:逆反射回的圆型偏振光在经过波片时形成与反射式偏光膜偏振角度相同的线性偏振光。
- 根据权利要求2所述的高精度空气显示系统,其特征在于:所述反射偏光膜另一侧聚焦成像位置与反射偏光膜的距离为d1,所述反射偏光膜与图像发生器的间距为d2,d1=d2。
- 根据权利要求2所述的高精度空气显示系统,其特征在于:所述图像发生器为OLED屏、LED屏或液晶屏。
- 根据权利要求2所述的高精度空气显示系统,其特征在于:所述图像发生器发出带有线性偏振角度为90度的线性偏振光,所述反射式偏光膜的线性偏振角度为180度;所述波片为四分之一波片,所述逆反射膜为高回归性逆反射膜。
- 根据权利要求2所述的高精度空气显示系统,其特征在于:所述波片与所述图像发生器的夹角为90°;所述图像发生器与所述反射式偏光膜的夹角为45°;所述反射式偏光膜与所述波片的夹角为45°。
- 一种高精度空气显示方法,其特征在于,包括以下步骤:1)所述图像发生器发出带有线性偏振角度的光线发射至处于图像 发生器上方倾斜设置的具有偏振角度的反射式偏光膜;所述图像发生器发出光线的线性偏振角度与反射式偏光膜的线性偏振角度垂直;2)所述反射式偏光膜将图像发生器发射过来的线性偏振光进行反射至处于反射式偏光膜一侧的波片,形成圆形型偏振光;3)穿过波片的圆型偏振光继续发射至逆反射膜,逆反射膜将圆型偏振光原路返回;4)原路返回的圆型偏振光再次穿过波片形成与反射式偏光膜偏振角度相同的线性偏振光;5)穿过波片返回的线性偏振光穿过反射式偏光膜在反射式偏光膜另一侧聚焦成像。
- 根据权利要求7所述的高精度空气显示方法,其特征在于:步骤1)中图像发生器发出带有90度线性偏振角度的光线,所述反射式偏光膜的线性偏振角度为180度;步骤2)中的波片为四分之一波片,所述反射式偏光膜将图像发生器发射过来的线性偏振光进行反射至处于反射式偏光膜一侧的波片形成135度的圆形型偏振光;步骤4)中原路返回的135度圆型偏振光穿过波片形成与反射式偏光膜偏振角度相同的180度线性偏振光。
- 根据权利要求7所述的高精度空气显示方法,其特征在于:所述反射式偏光膜另一侧聚焦成像位置与反射式偏光膜的距离为d1,所述反射式偏光膜与图像发生器的间距为d2,d1=d2。
- 根据权利要求7所述的高精度空气显示方法,其特征在于:所述图像发生器为OLED屏、LED屏或液晶屏。
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CN102098522A (zh) * | 2009-10-28 | 2011-06-15 | 精工爱普生株式会社 | 回复反射的光漫射显示系统 |
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