CN104658439B - A kind of 3D LED displays - Google Patents
A kind of 3D LED displays Download PDFInfo
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- CN104658439B CN104658439B CN201310587027.0A CN201310587027A CN104658439B CN 104658439 B CN104658439 B CN 104658439B CN 201310587027 A CN201310587027 A CN 201310587027A CN 104658439 B CN104658439 B CN 104658439B
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- 239000000463 material Substances 0.000 claims abstract description 32
- 239000006185 dispersion Substances 0.000 claims abstract description 8
- 230000010287 polarization Effects 0.000 claims description 27
- 239000011324 bead Substances 0.000 claims description 17
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 239000004973 liquid crystal related substance Substances 0.000 description 14
- 238000002834 transmittance Methods 0.000 description 6
- 239000004988 Nematic liquid crystal Substances 0.000 description 4
- 210000002858 crystal cell Anatomy 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Polarising Elements (AREA)
Abstract
The present invention provides a kind of 3D LED displays, including：LED display, polarizing coating and equiphase delay piece, the equiphase delay piece is made up of the birefringent material layer A and birefringent material layer B being laminated, and is respectively λ for two wavelength1、λ2Light, the thickness d of the birefringent material layer AAWith the thickness d of the birefringent material layer BBMeet： The e direction of principal axis of the birefringent material layer A and birefringent material layer B are mutually perpendicular to；Phase-delay quantity of the light of different wave length after the equiphase postpones piece is equal and value of phase-delay quantity is pi/2；The polarizing coating postpones between piece and the LED display in the equiphase.The 3D LED displays can eliminate dispersion, so as to avoid the 3D display defects such as light leak, companion shadow or crosstalk, realize more preferable display effect.
Description
Technical Field
The invention relates to a 3D LED display screen, in particular to a 3D LED display screen with an equal phase function.
Background
The LED screen is a novel imaging electronic device made of light emitting diodes arranged in sequence, has the characteristics of high brightness, wide visual angle, long service life and the like, and is widely applied to products such as television screens, outdoor advertising screens and the like. Compared with a common 3D screen, the 3D LED screen has higher brightness, brighter color, larger visual angle and higher product added value. In patent CN102750881A, a 3D LED display screen capable of enhancing polarization effect is realized by covering a polarization conversion film on the surface of a common LED screen and then covering a reflective polarization film. The reflective polarizing film in this patent is a special 1/4 wave plate, so the polarizing film and 1/4 wave plate are alternately covered on the surface of the ordinary LED display screen, and the final emergent light is left-handed circularly polarized light or right-handed circularly polarized light, thus realizing 3D display.
The LED display screen is formed by an LED lamp bead array, each LED lamp bead at least comprises an R (red), G (green) and B (blue) tricolor LED chip, and the light of the three colors corresponds to different wavelengths. The phase retardation of the light wave of the wave plate commonly used for realizing the 3D display effect of the LED screen has a one-to-one correspondence relationship with the wavelength of the light, the phase retardation of the polarized light with three wavelengths of red light, green light and blue light after passing through the common 1/4 wave plate is not equal, and the emergent light of the tricolor light is circularly polarized light or elliptically polarized light, so that chromatic aberration is generated, and 3D display defects such as light leakage, ghost shadow or crosstalk are caused.
The 3D LED display screen with equal phase delay function needs to be invented, which can realize the adjustment of the phase delay amount of two lights with different wavelengths, and further realize equal phase delay. The display screen can eliminate color difference, avoid 3D display defects such as light leakage, shadow accompaniment or crosstalk and the like, and realize better display effect.
Disclosure of Invention
In order to solve the problems in the prior art, the surface of the LED display screen is alternately covered with the polarizing film and the equal phase delay sheet, so that the 3D polarization display effect is realized.
In order to accomplish the above object of the invention, the present invention provides a 3D LED display screen, comprising: the LED display screen is formed by an array of LED lamp beads, and each LED lamp bead at least comprises R, G, B tricolor LED chips; the polarizing film can enable each LED lamp bead to emit left polarized light or right polarized light which are perpendicular to each other; and an equiphase retardation plate composed of a birefringent material layer A and a birefringent material layer B laminated to each other at two wavelengths λ1、λ2The thickness d of the birefringent material layer AAAnd a thickness d of the birefringent material layer BBSatisfies the following conditions:
wherein,andrespectively, said wavelength is λ1At the birefringent material layer A and the double layerBirefringence in the refractive material layer B;andrespectively, said wavelength is λ2The birefringence of the light in the birefringent material layer a and the birefringent material layer B; the dispersion of the birefringent material layer A and the dispersion of the birefringent material layer B have a difference; the e-axis directions of the birefringent material layer A and the birefringent material layer B are mutually vertical; the phase delay amounts of the light with different wavelengths passing through the equal phase delay sheet are equal and the values of the phase delay amounts are pi/2; the polarizing film is between the equal phase retardation plate and the LED display screen.
In some embodiments, the polarizer film is a left polarizer film or a right polarizer film, and the polarization angles of the left polarizer film and the right polarizer film are at a 90 degree angle to each other.
In some embodiments, each of the LED lamp beads is attached with the left polarization film to transmit left polarized light, or attached with the right polarization film to transmit right polarized light.
In some embodiments, the directions of the optical axes of the equiphase retarders and the polarization directions of the left polarized light and the right polarized light respectively form angles of about 45 degrees.
In some embodiments, a display driving control system of the LED display screen transmits left and right eye images to the LED lamp beads covered with the left polarizing film and the right polarizing film, respectively, so that the left and right eye images are displayed according to corresponding pixels.
The invention can realize the adjustment of the phase retardation of the light with two different wavelengths by changing the thickness and the birefringence of the two birefringent materials A, B, thereby realizing the equal phase retardation. The equiphase delay piece is applied to equipment such as a display and an optical communication device, and can achieve the effects of eliminating dispersion and improving contrast.
Compared with the 3D LED display screen in the prior art, the 3D LED display screen with the equal phase function can realize the adjustment of the phase delay amount of the light with two different wavelengths, and further realize equal phase delay. The display effect of eliminating dispersion and improving contrast can be achieved, and the display device has good display characteristics.
Drawings
FIG. 1 is a schematic structural diagram of a 3D LED display screen with an equal phase function;
FIG. 2 is a schematic diagram of a 3D LED display screen with equal phase function;
FIG. 3 is a graph showing the transmittance of a λ/2 retardation plate composed of an equiphase λ/4 retardation plate of example 1 compared with that of a λ/2 retardation plate composed of a general λ/4 retardation plate;
FIG. 4 is a graph showing the transmittance of a λ/2 retardation plate composed of an equiphase λ/4 retardation plate of example 2 compared with that of a λ/2 retardation plate composed of a normal λ/4 retardation plate.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The invention provides a 3D LED display screen with an equiphase function, which mainly comprises an LED display screen, a layer of polarizing film and an equiphase retarder. The LED display screen is composed of an LED lamp bead array; the polarization film can be a left polarization film or a right polarization film and is arranged in front of the LED screen; the equal phase retardation plate is composed of two layers of birefringent materials with dispersion difference and mutually vertical e-axis directions, the phase retardation amounts of light with different wavelengths passing through the equal phase retardation plate are equal, and the values of the phase retardation amounts are pi/2; the equiphase retardation plate is arranged in front of the polarizing film.
The display principle of the 3D LED display screen with the equal phase function is shown in fig. 2, wherein R, G and B represent Red (Red), Green (Green) and Blue (Blue) tricolor LED chips in LED lamp beads respectively, and full-color display can be achieved. The light emitted by the LED lamp beads is natural unpolarized light, and the polarized light after penetrating through the left polarizing film and the right polarizing film is emitted to the equal-phase retarder. The optical axis direction of the equiphase retarder and the polarization direction of the left polarized light and the right polarized light are respectively included angles of 45 degrees, and then the left polarized light and the right polarized light penetrate through the equiphase retarder to form left circularly polarized light and right circularly polarized light, so that the 3D display effect can be realized.
Example 1
Fig. 1 is a schematic structural diagram of the 3D LED display screen capable of implementing an equiphase function according to this embodiment. The 3D LED display screen with the equal phase function mainly comprises an LED display screen, a layer of polarizing film and an equal phase delay sheet; the LED screen is composed of an LED lamp bead array; the polarization film can be a left polarization film or a right polarization film and is arranged in front of the LED screen; the equal phase retardation plate consists of two anti-parallel friction liquid crystal boxes and is arranged in front of the polarizing film. Both the LED display screen and the polarizing film are commercially available. The phase retardation amounts of the light with different wavelengths passing through the equal phase retardation plate are equal, and the values of the phase retardation amounts are pi/2, and the preparation method of the equal phase retardation plate comprises the following steps:
taking 8 pieces of ITO glass, carrying out orientation treatment, wherein the pretilt angle is 3 degrees, and manufacturing two antiparallel friction liquid crystal boxes with the thickness of 5 micrometers and the thickness of 10 micrometers.
The nematic liquid crystal used by the equiphase wave plate is produced by Jiangsu and Chengdi display science and technology GmbH, and the types of the nematic liquid crystal are respectively as follows: HAG613089 and HAG623073, Δ n 0.99 and 0.065, respectively.
HAG613089 liquid crystal was poured into a 5 μm antiparallel alignment liquid crystal cell by capillary action, and HAG623073 was poured into a 10 μm antiparallel alignment liquid crystal cell. Two different liquid crystal boxes are jointed, so that the arrangement directions of liquid crystal molecules of the two different liquid crystal boxes are vertical to each other, and two equal-phase lambda/4 delay plates are formed. And then the two equal-phase lambda/4 delay pieces are jointed in the same way in the fast axis direction, thus forming the equal-phase lambda/2 delay piece.
The prepared equal phase lambda/2 delay sheet is placed between two parallel polaroids, so that the direction of the fast axis and the direction of the absorption axis of the polaroids form 45 degrees. The light transmittance of the retardation film in the wavelength range of 450 nm-650 nm is measured, and compared with a lambda/2 retardation film which is made of a common lambda/4 phase retardation film with the model number of WPA4210 and is produced by Wuhan high-quality optical science and technology Limited liability company.
As shown in FIG. 2, tests show that when the wavelength of light is changed within 450 nm-650 nm, the light transmittance of the equal-phase lambda/2 retarder composed of the equal-phase lambda/4 retarder is basically zero, the achromatic effect is remarkable, and the equal-phase lambda/2 retarder is superior to the lambda/2 retarder composed of the common lambda/4 retarder.
Example 2
Fig. 1 is a schematic structural diagram of the 3D LED display screen capable of implementing an equiphase function according to this embodiment. The 3D LED display screen with the equal phase function mainly comprises an LED display screen, a layer of polarizing film and an equal phase delay sheet; the LED screen is composed of an LED lamp bead array; the polarization film can be a left polarization film or a right polarization film and is arranged in front of the LED screen; the equal phase retardation plate consists of two anti-parallel friction liquid crystal boxes and is arranged in front of the polarizing film. Both the LED display screen and the polarizing film are commercially available. The phase retardation amounts of the light with different wavelengths passing through the equal phase retardation plate are equal, and the values of the phase retardation amounts are pi/2, and the preparation method of the equal phase retardation plate comprises the following steps:
taking 8 pieces of ITO glass, carrying out orientation treatment, wherein the pretilt angle is 3 degrees, and manufacturing two antiparallel friction liquid crystal boxes with the thickness of 10 microns and the thickness of 2 microns.
The nematic liquid crystal used by the equiphase wave plate is produced by Jiangsu and Chengdi display science and technology GmbH, and the types of the nematic liquid crystal are respectively as follows: HNG717200-000 and HTD026100-100, Δ n were 0.039 and 0.324, respectively.
HNG717200-000 was cast into a 10 μm antiparallel rubbed liquid crystal cell using capillary action, and HTD026100-100 was cast into a 2 μm antiparallel rubbed liquid crystal cell. Two liquid crystal boxes are jointed in a mode that liquid crystal molecules are vertical to each other (the e-axis directions are vertical to each other), and the equal phase lambda/4 retardation plate is formed. And then the two equal-phase lambda/4 delay pieces are jointed in the same way in the fast axis direction, thus forming the equal-phase lambda/2 delay piece.
The prepared equal phase lambda/2 delay sheet is placed between two parallel polaroids, so that the direction of the fast axis and the direction of the absorption axis of the polaroids form 45 degrees. The light transmittance of the retardation film in the wavelength range of 450 nm-650 nm is measured, and compared with a lambda/2 retardation film which is made of a common lambda/4 phase retardation film with the model number of WPA4210 and is produced by Wuhan high-quality optical science and technology Limited liability company.
As shown in FIG. 3, tests show that when the wavelength of light is changed within 450 nm-650 nm, the light transmittance of the equal-phase lambda/2 retarder composed of the equal-phase lambda/4 retarder is basically zero, the achromatic effect is remarkable, and the equal-phase lambda/2 retarder is superior to the lambda/2 retarder composed of the common lambda/4 retarder.
Of course, the foregoing is only a preferred embodiment of the present invention, and it should be noted that, for a person skilled in the art, several modifications and adjustments can be made without departing from the principle of the present invention, and these modifications and adjustments should also be considered to fall within the protection scope of the present invention.
Claims (5)
1. A 3D LED display screen comprising:
the LED display screen is formed by an array of LED lamp beads, and each LED lamp bead at least comprises R, G, B tricolor LED chips;
the polarizing film can enable each LED lamp bead to emit left polarized light or right polarized light which are perpendicular to each other; and
an equiphase retardation plate composed of a birefringent material layer A and a birefringent material layer B laminated to each other at two wavelengths respectively λ1、λ2The light of (a) is emitted from the light source,thickness d of the birefringent material layer AAAnd a thickness d of the birefringent material layer BBSatisfies the following conditions:
<mrow> <mfrac> <msub> <mi>d</mi> <mi>A</mi> </msub> <msub> <mi>d</mi> <mi>B</mi> </msub> </mfrac> <mo>=</mo> <mfrac> <mrow> <msub> <mi>&Delta;n</mi> <mrow> <msub> <mi>B&lambda;</mi> <mn>2</mn> </msub> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>&lambda;</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>&Delta;n</mi> <mrow> <msub> <mi>B&lambda;</mi> <mn>1</mn> </msub> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>&lambda;</mi> <mn>2</mn> </msub> </mrow> <mrow> <msub> <mi>&Delta;n</mi> <mrow> <msub> <mi>A&lambda;</mi> <mn>2</mn> </msub> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>&lambda;</mi> <mn>1</mn> </msub> <mo>-</mo> <msub> <mi>&Delta;n</mi> <mrow> <msub> <mi>A&lambda;</mi> <mn>1</mn> </msub> </mrow> </msub> <mo>&CenterDot;</mo> <msub> <mi>&lambda;</mi> <mn>2</mn> </msub> </mrow> </mfrac> <mo>,</mo> </mrow>
wherein,andrespectively, said wavelength is λ1The birefringence of the light in the birefringent material layer a and the birefringent material layer B;andrespectively, said wavelength is λ2The birefringence of the light in the birefringent material layer a and the birefringent material layer B; the dispersion of the birefringent material layer A and the dispersion of the birefringent material layer B have a difference; the directions of the e light of the birefringent material layer A and the birefringent material layer B are mutually vertical; the phase delay amounts of the light with different wavelengths passing through the equal phase delay sheet are equal and the values of the phase delay amounts are pi/2;
the polarizing film is between the equal phase retardation plate and the LED display screen.
2. The 3D LED display screen of claim 1, wherein the polarization film is a left polarization film or a right polarization film, and polarization angles of the left polarization film and the right polarization film are 90 degrees from each other.
3. The 3D LED display screen of claim 2, wherein each LED lamp bead is attached with the left polarization film to transmit left polarized light or attached with the right polarization film to transmit right polarized light.
4. The 3D LED display screen according to any one of claims 1-3, wherein the directions of the optical axes of the equal phase retarders and the polarization directions of the left polarized light and the right polarized light respectively form angles of 45 degrees.
5. The 3D LED display screen according to claim 2 or 3, wherein a display driving control system transmits left and right eye images to the LED lamp beads covered with the left polarizing film and the right polarizing film respectively, so that the left and right eye images are displayed according to corresponding pixels.
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| US11307434B2 (en) | 2016-09-01 | 2022-04-19 | 3D Live, Inc. | Stereoscopic display apparatus employing light emitting diodes with polarizing film/lens materials |
| CN106646919B (en) * | 2017-02-17 | 2020-12-11 | 深圳市万明精工科技有限公司 | Circular polarized light device and manufacturing and application method thereof |
| US11543676B2 (en) | 2019-08-30 | 2023-01-03 | 3D Live, Inc. | Encapsulation of polarized light emitters |
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|---|---|---|---|---|
| US5982541A (en) * | 1996-08-12 | 1999-11-09 | Nationsl Research Council Of Canada | High efficiency projection displays having thin film polarizing beam-splitters |
| CN101183177A (en) * | 2007-12-13 | 2008-05-21 | 友达光电股份有限公司 | Steroscopic display and manufacturing method thereof |
| CN101479654A (en) * | 2006-09-07 | 2009-07-08 | 夏普株式会社 | Liquid crystal display device |
| CN201622392U (en) * | 2009-11-20 | 2010-11-03 | 中国科学技术大学 | Light-emitting diode (LED) polarizing film display screen for stereoscopic display |
| CN202306069U (en) * | 2010-12-10 | 2012-07-04 | 株式会社有泽制作所 | Three-dimensional image display device |
| CN103197427A (en) * | 2013-04-12 | 2013-07-10 | 福建泰德视讯数码科技有限公司 | Unaided-eye three-dimensional (3D) light emitting diode (LED) display screen and manufacturing technique thereof |
-
2013
- 2013-11-19 CN CN201310587027.0A patent/CN104658439B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5982541A (en) * | 1996-08-12 | 1999-11-09 | Nationsl Research Council Of Canada | High efficiency projection displays having thin film polarizing beam-splitters |
| CN101479654A (en) * | 2006-09-07 | 2009-07-08 | 夏普株式会社 | Liquid crystal display device |
| CN101183177A (en) * | 2007-12-13 | 2008-05-21 | 友达光电股份有限公司 | Steroscopic display and manufacturing method thereof |
| CN201622392U (en) * | 2009-11-20 | 2010-11-03 | 中国科学技术大学 | Light-emitting diode (LED) polarizing film display screen for stereoscopic display |
| CN202306069U (en) * | 2010-12-10 | 2012-07-04 | 株式会社有泽制作所 | Three-dimensional image display device |
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Address after: 212212 Yangtze River bridge, Jiangsu, Yangzhong, Yangzhong on the eastern side of the road Patentee after: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. Address before: 212212 Yangtze River bridge, Jiangsu, Yangzhong, Yangzhong on the eastern side of the road Patentee before: Jiangsu Hecheng Display Technology Co.,Ltd. |
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Address after: 2/F, Sino Japan Cooperation Innovation Park, No. 16 Zidan Road, Qinhuai District, Nanjing, Jiangsu Province, 210014 Patentee after: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. Address before: 212212 East Side of Yangzhong Yangtze River Bridge, Zhenjiang City, Jiangsu Province Patentee before: JIANGSU HECHENG DISPLAY TECHNOLOGY Co.,Ltd. |