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E P 3 528 041A 1
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EP 3 528 041A1
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EUROPEAN PATENT APPLICATION
(43)Date of publication:
21.08.2019Bulletin 2019/34
(21)Application number: 19158017.4(22)Date of filing: 19.02.2019(51)Int Cl.:
G02F 1/29(2006.01)
G02B 27/22(2018.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME
Designated Validation States: KH MA MD TN
(30)Priority:19.02.2018KR 20180019529
(71)Applicant: Samsung Electronics Co., Ltd.
Suwon-si, Gyeonggi-do, 16677 (KR)
(72)Inventors:
•Song, Hoon
Gyeonggi-do 16678 (KR)•An, Jungkwuen
Gyeonggi-do 16678 (KR)•Kim, Young
Gyeonggi-do 16678 (KR)•Won, Kanghee
gomiGyeonggi-do 16678 (KR)
(74)Reprentative: Hylarides, Paul Jacques et al
Arnold & Siedsma
Bezuidenhoutweg 572594 AC Den Haag (NL)
(54)BEAM DEFLECTOR
附件英文
韩国艺人收入(57)
The prent application concerns a beam de-flector (100). The beam deflector (100) includes a first deflector (110) configured to controllably deflect incident light having a first polarization state in a first horizontal direction; a half-wave plate (150) configured to rotate a polarization of light transmitted by the first deflector by 90°; and a cond deflector (120) configured to control-lably deflect light transmitted by the half-wave plate hav-ing the first polarization state in a cond horizontal di-rection that is different from the first horizontal direction.
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Description BACKGROUND 1. Field学生厌学
[0001]Example embodiments of the prent disclo-sure relate to a beam deflector and a three-dimensional (3D) display device including the beam deflector.
tp52. Description of the Related Art
[0002]Holographic displays are capable of providing clear 3D images in a wide depth-expression range with-out causing eyestrain and are thus considered to be the ideal 3D display technology. However, such a holograph-ic display requires a high-resolution spatial light modu-lator (SLM) having a pixel size on the order of the wave-length of the light ud, a coherent surface light source,and large amounts of computer generated hologram (CGH) calculations.
[0003]According to a recently propod binocular hologram method, hologram images are generated and transmitted in a limited manner to only the fields of vision of the eyes of an obrver so as to lower data processing and resolution conditions. For example, a hologram im-age having a point of view corresponding to the field of vision of the left eye of an obrver and a hologram image having a point of view corresponding to the field of vision of the right eye of the obrver are generated and pro-vided to the left and right eyes of the obrver, without generating hologram images for any othe
r point of view.In this ca, it is not necessary to generate hologram images having other points of view, and thus the amount of data processing is markedly reduced. In addition, cur-rent commercial display devices are capable of satisfying the resolution requirements of SLMs.
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[0004]In order to implement the above-noted binocu-lar hologram method, light containing images having points of view corresponding to both eyes of an obrver must be directed to both eyes of the obrver. It is there-fore necessary to individually control two types of light.SUMMARY
[0005]Example embodiments provide a beam deflec-tor and a 3D display device including the beam deflector.[0006]Additional aspects will be t forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the prented embodiments.
[0007]According to an aspect of an example embod-iment, there is provided a beam deflector including: a first deflector configured to controllably deflect incident light having a first polarization state in a first direction, the first direction being controlled in a first plane; a half-wave plate configured to rotate a polarization of light transmit-ted by the first deflector by 90°; and a cond deflector
configured to controllably deflect light transmitted by the half-wave plate having the first polarization
state in a c-ond direction that is different from the first direction, the cond direction being controlled in the first plane.
[0008]Each of the first deflector and the cond de-flector may include a material having electrically control-lable optical anisotropy.
asians
[0009]Each of the first deflector and the cond de-flector may include: a first electrode portion; a cond electrode portion; and a liquid crystal layer provided be-tween the first electrode portion and the cond electrode portion, the liquid crystal layer including liquid crystal mol-ecules initially arranged in a mode in which a major-axis direction of the liquid crystal molecules is parallel with a direction of the first polarization state.
[0010]The first electrode portion may include a plural-ity of sub-electrodes, and wherein the plurality of sub-electrodes may be arranged horizontally at intervals and have a strip shape extending in a vertical direction.神采奕奕
[0011]The beam deflector may further include: a third deflector configured to controllably deflect incident light having a cond polarization state in a third direction, the third direction being controlled in a cond plane that is perpendicular to the first plane; a cond half-wave plate configu
red to rotate a polarization of light transmitted by the third deflector by 90°; and a fourth deflector config-ured to controllably deflect light transmitted by the cond half-wave plate having the cond polarization state in a fourth direction that is different from the third direction,the fourth direction being controlled in the cond plane.[0012]Each of the third deflector and the fourth deflec-tor may include: a third electrode portion; a fourth elec-trode portion; and a liquid crystal layer provided between the third electrode portion and the fourth electrode por-tion, the liquid crystal layer including liquid crystal mole-cules initially arranged in a mode in which a major-axis direction of the liquid crystal molecules is parallel with a direction of the cond polarization state.
[0013]The third electrode portion may include a plu-rality of sub-electrodes, and the plurality of sub-elec-trodes may be arranged vertically at intervals and have a strip shape extending in a horizontal direction.
横越
rhythmic[0014]The beam deflector may further include: a third deflector provided at a same side of the half-wave plate as the first deflector, the third deflector being configured to controllably deflect incident light having a cond po-larization state in a third direction, the third direction being controlled in a cond plane that is perpendicular to the first plane; and a fourth deflector provided at a same side of the half-wave plate as the cond deflector, the fourth deflector being configured to controllably de
flect incident light having the cond polarization state in a fourth di-rection that is different from the third direction, the fourth direction being controlled in the cond plane.
[0015]Each of the third deflector and the fourth deflec-tor may include: a third electrode portion; a fourth elec-trode portion; and a liquid crystal layer provided between the third electrode portion and the fourth electrode por-
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