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WO2020171666A1 - Plaque de guidage de lumière à diffraction et dispositif d'affichage la comprenant - Google Patents

Plaque de guidage de lumière à diffraction et dispositif d'affichage la comprenant Download PDF

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Publication number
WO2020171666A1
WO2020171666A1 PCT/KR2020/002591 KR2020002591W WO2020171666A1 WO 2020171666 A1 WO2020171666 A1 WO 2020171666A1 KR 2020002591 W KR2020002591 W KR 2020002591W WO 2020171666 A1 WO2020171666 A1 WO 2020171666A1
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WO
WIPO (PCT)
Prior art keywords
output
light
diffractive optical
optical elements
optical element
Prior art date
Application number
PCT/KR2020/002591
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English (en)
Korean (ko)
Inventor
박정호
박성민
한상철
신부건
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020200021640A external-priority patent/KR102330600B1/ko
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Priority to CN202080006083.9A priority Critical patent/CN112997109B/zh
Priority to EP20760197.2A priority patent/EP3865929B1/fr
Priority to JP2021532299A priority patent/JP7183422B2/ja
Priority to US17/299,281 priority patent/US11953711B2/en
Publication of WO2020171666A1 publication Critical patent/WO2020171666A1/fr

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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
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • 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
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Definitions

  • the present invention relates to a display device comprising a diffractive light guide plate and a diffractive light guide plate.
  • a display unit implementing augmented reality, mixed reality, or virtual reality includes a diffractive light guide plate using a diffraction phenomenon based on the wave nature of light.
  • FIG. 1 is a diagram schematically showing a diffractive light guide plate according to the prior art.
  • the diffractive light guide plate 10 includes an optical guide unit 11 and a plurality of diffractive optical elements 12, 13, and 14 provided on one or the other side of the optical guide unit 11 and having a plurality of linear grating patterns. can do.
  • the diffractive light guide plate 10 includes an input diffraction optical element 12 and an optical guide unit 11 for guiding the light output through the micro light source output element P to be input and guided onto the light guide unit 11. It is optically coupled to the input diffractive optical element 12 through diffraction, and the light received from the input diffractive optical element 12 can be diffracted in one dimension in the first direction (the x-axis direction in FIG. 1).
  • An output diffraction optical element 14 may be provided that is output from the optical guide 11 and directed toward the user's pupil with one-dimensional expansion in the y-axis direction in FIG. 1).
  • the main optical path for reaching the user's pupil of the light output through the micro light source output device (P) is the input diffraction optical device (12)-the intermediate diffraction optical device (13)-the output diffraction optical device (14)-the user's Since pupils are in order, the size of the optical image output from the optical guide unit 11 through the output diffractive optical element 14 depends on the area occupied by the output diffractive optical element 14.
  • the single input diffractive optical element 12, the single intermediate diffractive optical element 13, and the single output diffractive optical element 14 are disposed separately from each other on the optical guide unit 11 .
  • the area occupied by the output diffractive optical element 14 on the optical guide unit 11 may be limited to an area excluding the area occupied by the input diffractive optical element 12 and the intermediate diffractive optical element 13 on the optical guide unit 11. Inevitably, there were limitations in outputting a larger optical image, and limitations in which the visible area according to the user's pupil position deviation was limited.
  • a diffractive light guide plate having a structure as shown in FIG. 2 may be considered.
  • FIG. 2 shows a diffractive light guide plate including an optical guide portion 21, an input diffractive optical element 22, and two diffractive optical elements 23 and 24 having different linear grating patterns and coming into contact with each other.
  • FIG. 3A is a plan view schematically illustrating an example of an optical path proceeding through the diffractive light guide plate shown in FIG. 2, and FIG. 3B is a schematic view illustrating another example of an optical path proceeding through the diffractive light guide plate illustrated in FIG. 2. It is a floor plan.
  • the light guide part 21 guides light from the inside using total internal reflection.
  • the input diffraction optical element 22 may diffract the input light (L1, L1a, L1b) so that the light (L1, L1a, L1b) output from the light source is input and guided on the optical guide unit 21.
  • the two diffractive optical elements 23 and 24 may be configured to receive the diffracted light L2a and L2b, and the received light may be expanded one-dimensionally by diffraction.
  • the diffracted light (L2a, L2b) received from the input diffraction optical element 22 is diffracted while passing through the other diffractive optical elements 23 and 24, so that the optical path is changed, and the rest can be totally reflected by the existing optical path.
  • the light initially received from the input diffraction optical element 22 can be divided into a plurality of beams L3a and L3b while such diffraction is performed a plurality of times at a point spaced apart in a specific direction, in the end, one-dimensional expansion is achieved. I can.
  • Each of the two diffractive optical elements 23 and 24 receives the extended light (L3b, L3a) from the other diffractive optical elements 24 and 23, and the received light (L3b, L3a) is diffracted through the optical guide unit 21 ) Can be configured to be output from.
  • each of the two diffractive optical elements 23 and 24 can also receive extended light (L3b, L3a) from the other diffractive optical elements 24 and 23, and the received light can be expanded one-dimensionally by diffraction. .
  • a plurality of beams (L3b, L3a) formed by light expanded by the other diffractive optical elements (140, 130) are spaced apart from the light receiving side (C) of each of the two diffractive optical elements (130, 140).
  • the direction in which there is a single beam (L3b, L3a) and the direction in which the plurality of beams (L4b, L4a) extended by the two diffractive optical elements (130, 140) are separated from each other cross each other. Two-dimensional expansion is performed based on the light L1a and L1b received by the optical device 120.
  • Each of the two diffractive optical elements (23, 24) receives the light (L3b, L3a) extended from the other diffractive optical elements (24, 23) and the light receiving side (C) is different from the diffractive optical elements (24, 23). It may be configured to be in contact with the side (C).
  • the light output from the light source is output from the optical guide unit 110 through the input diffractive optical element 22-two diffractive optical elements 23 and 24-other diffractive optical elements 24 and 23.
  • the light output from 110 may be combined with the light output by each of the other diffractive optical elements 24 and 23 to form one image light.
  • FIGS. 3A and/or 3B are cross-sectional views taken along line III-III' of the diffractive light guide plate shown in FIGS. 3A and/or 3B.
  • the light diffracted through each of the two diffractive optical elements 23 and 24 and output from the optical guide unit 21 may be output at a predetermined emission angle ( ⁇ , ⁇ ') with respect to one surface of the optical guide unit 21.
  • ⁇ , ⁇ ' a predetermined emission angle
  • the light L4a diffracted by the diffraction optical element 23 located on the upper side and outputted is tilted downward with a predetermined emission angle ⁇ with respect to one surface of the light guide unit 21 and is output.
  • the light L4b diffracted by the diffractive optical element 24 located at the lower side and outputted may be output by tilting upward with a predetermined emission angle ⁇ 'with respect to one surface of the optical guide unit 21.
  • the light diffracted by the diffractive optical element 23 located on the upper side and output by the light (L4a) and the diffractive optical element 24 located at the lower side to output the diffracted light The light (L4b) to form a crossing region (I) crossing each other. If the distance separated from one surface of the optical guide part 21 is as much as the eye relief where the user's pupil is located, the user's pupil must be located in the intersection area (I) so that the user can see a dark portion of the entire area. Without it, normal image light can be recognized.
  • the light (L4b) diffracted and output by the diffractive optical element 24 located on the lower side cannot be visually recognized by the user.
  • the image light visually recognized by may appear dark in the lower part based on the III-III' line.
  • the light (L4a) diffracted and output by the diffractive optical element 23 located on the upper side cannot be visually recognized by the user.
  • the image light visually recognized by the III-III' line may appear dark in the upper part.
  • a structure of a diffractive light guide plate capable of vertically forming an intersecting region I related to an eye motion box, which is an area in which normal image light can be visually recognized.
  • An object of the present invention is to provide a diffractive light guide plate capable of forming a large viewing angle and an eye motion box, and a display device including the diffractive light guide plate.
  • An embodiment according to an aspect of the present invention includes a light guide unit for guiding light; An input diffraction optical element for diffracting the input light so that the light output from the light source is input and guided on the light guide unit; And two output diffraction optical elements of different linear grating patterns arranged in a predetermined area of the optical guide unit, each of the two output diffraction optical elements receiving light from the input diffraction optical element and received light It is configured to be directed to another output diffraction optical element by this diffraction, and each of the two output diffraction optical elements is configured to receive light from the other output diffraction optical element and to output the received light from the optical guide by diffraction.
  • the two output diffractive optical elements are in contact with each other without forming an overlapping region on the optical guide, and have at least a predetermined width within the predetermined region and are elongated from a side adjacent to the input diffractive optical element to an opposite side.
  • a diffractive light guide plate is provided in which two output diffractive optical elements of different linear grating patterns are intersected at least one-dimensionally.
  • the two output diffractive optical elements are two-dimensionally intersected in the central region.
  • the two output diffractive optical elements are arranged two-dimensionally across the entire predetermined area.
  • each width of the two output diffractive optical elements in a region where the two output diffractive optical elements are cross-arranged is 4 mm or less.
  • the lengths of each of the two output diffractive optical elements in a region where the two output diffractive optical elements are cross-arranged are 4 mm or less.
  • each of the diffractive optical elements includes a linear grating repeatedly formed at a predetermined pitch, and a grating vector defined in a direction perpendicular to a direction in which the linear gratings extend and a size inversely proportional to the pitch of the linear gratings.
  • the sum of the grating vectors of the input diffractive optical element and the two diffractive optical elements may have a magnitude of zero.
  • the grating vectors of the input diffractive optical element and the two diffractive optical elements may have the same size.
  • the grating vectors of the input diffractive optical element and the two diffractive optical elements may form an angle of 60° to each other.
  • the two diffractive optical elements may be provided on the same plane on the optical guide unit.
  • An embodiment according to another aspect of the present invention includes a light source that outputs image light forming an image; And it provides a display device including a diffraction light guide plate according to an embodiment of the present invention.
  • the viewing angle is larger than when the image light is output from the optical guide unit only with a single diffractive optical element.
  • two output diffractive optical elements of different linear grating patterns are arranged at least one-dimensionally in a central region that has at least a predetermined width within a predetermined area and is elongated from the side adjacent to the input diffractive optical element to the opposite side.
  • FIG. 1 is a diagram schematically showing a diffractive light guide plate according to the prior art.
  • FIG. 2 shows a diffractive light guide plate including an optical guide unit, an input diffractive optical element, and two diffractive optical elements having different linear grating patterns and coming into contact with each other.
  • 3A is a plan view schematically illustrating an example of an optical path proceeding through the diffractive light guide plate shown in FIG. 2.
  • 3B is a plan view schematically illustrating another example of an optical path proceeding through the diffractive light guide plate shown in FIG. 2.
  • FIG. 4 is a cross-sectional view taken along line IV-IV' of the diffractive light guide plate shown in FIGS. 3A and/or 3B.
  • FIG. 5 is a diagram schematically illustrating a diffractive light guide plate according to an aspect of the present invention.
  • 6A to 6C are plan views of gratings included in various diffractive optical elements included in the diffractive light guide plate according to an aspect of the present invention.
  • FIG. 7 is a diagram illustrating a combination of grating vectors included in various diffractive optical elements included in the diffractive light guide plate according to an aspect of the present invention.
  • FIGS. 8A to 8C are plan views of a diffractive light guide plate according to various embodiments of the present invention.
  • FIG. 9 is a cross-sectional view taken along line IV-IV' of the diffractive light guide plate shown in FIG. 5.
  • FIG. 10 is a view showing a simulation result of light output from a diffractive light guide plate according to a comparative example of the present invention.
  • FIG. 11 is a result of capturing an image output by a diffractive light guide plate according to a comparative example of the present invention.
  • FIG. 12 is a view showing a simulation result of light output from a diffractive light guide plate according to an embodiment of the present invention.
  • the term "light guide part” may be defined as a structure for guiding light from the inside using total internal reflection.
  • the condition for total internal reflection is that the refractive index of the optical guide portion must be greater than that of the surrounding medium adjacent to the surface of the optical guide portion.
  • the light guide unit may be formed of a glass and/or plastic material, and may be transparent or translucent.
  • the light guide portion may be formed in various layouts on a plate type.
  • the term “plate” refers to a three-dimensional structure having a predetermined thickness between one side and the other side opposite to the one side and the other side may be a substantially flat plane, but at least one of the side and the other side It may be formed to be curved one-dimensionally or two-dimensionally.
  • the plate-type optical guide portion may be curved one-dimensionally so that one surface and/or the other surface thereof may have a shape corresponding to a part of the side surface of the cylinder.
  • the curvature formed by the curvature has a sufficiently large radius of curvature to facilitate total internal reflection in order to guide light on the light guide part.
  • the term "diffraction optical device” may be defined as a structure for changing an optical path by diffracting light on an optical guide part.
  • the “diffraction optical device” may mean a portion in which a linear grating oriented in one direction on the optical guide portion is arranged in a predetermined direction to form a predetermined area while having a pattern.
  • linear grating refers to a protrusion shape having a predetermined height on the surface of the light guide unit (ie, a relief pattern) and/or a groove shape having a predetermined depth on the surface of the light guide unit (ie, an intaglio pattern Can mean ).
  • the orientation direction of the linear grating can be freely designed so that the optical path can be changed in the intended direction through diffraction by the diffractive optical element.
  • FIGS. 6A to 6C are plan views of gratings included in various diffractive optical elements included in the diffractive light guide plate according to an aspect of the present invention
  • 7 is a diagram illustrating a combination of grating vectors included in various diffractive optical elements included in the diffractive light guide plate according to an aspect of the present invention.
  • FIG. 8A to 8C are plan views of the diffractive light guide plate according to various embodiments of the present invention
  • FIG. 9 is a cross-sectional view of the diffractive light guide plate shown in FIG. 5 taken along line IV-IV'.
  • the diffractive light guide plate 100 may include an optical guide unit 110, an input diffractive optical element 120, and two output diffractive optical elements 130 and 140.
  • the light guide unit 110 may guide light from the inside using total internal reflection.
  • the input diffraction optical element 120 may diffract the input light so that the light output from the light source is input and guided on the light guide unit 110.
  • the input diffraction optical element 120 may be disposed on one surface 110a (eg, the left side of FIG. 5) of the optical guide unit 110.
  • the two output diffraction optical elements 130 and 140 may be disposed in a predetermined area S on one surface 110a or the other surface 110b of the optical guide unit.
  • the two output diffraction optical elements 130 and 140 have different linear grating patterns.
  • Each of the two output diffraction optical elements 130 and 140 may be configured to receive light from the input diffraction optical element 120 and the received light to be directed to the other output diffraction optical elements 140 and 130 by diffraction. .
  • each of the two output diffraction optical elements 130 and 140 may be configured to receive light diffracted from the input diffraction optical element 120 and the received light to be one-dimensionally extended by diffraction. As the diffracted light received from the input diffraction optical element 120 passes through the other diffractive optical elements 130 and 140, some of the diffracted optical paths are changed, and the rest can be totally reflected into the existing optical path. Since the light initially received from 120 can be divided into a plurality of beams while such diffraction is performed a plurality of times at a point spaced apart in a specific direction, eventually, a one-dimensional expansion can be achieved.
  • Each of the two output diffractive optical elements 130 and 140 may be configured to receive extended light from the other diffractive optical elements 140 and 130 and to output the received light from the optical guide unit 110 by diffraction.
  • each of the two output diffractive optical elements 130 and 140 may also receive extended light from the other output diffractive optical elements 140 and 130, and the received light may be expanded one-dimensionally by diffraction.
  • the light output by the light source can be treated as being expanded in two dimensions based on the light received by the input diffraction optical element 120 from the light source.
  • the two output diffraction optical elements 130 and 140 may be partially overlapped on the optical guide unit 110 due to a design error of a manufacturing process.
  • the two output diffractive optical elements 130 and 140 do not form overlapping regions on the optical guide unit 110.
  • every time it encounters a linear grating pattern spaced apart on the diffraction optical element it does not proceed to the intended total reflection path little by little. The light path could be distorted.
  • each of the two output diffraction optical elements (130, 140) does not overlap with each other based on the plan view of the other output diffraction optical elements (140, 130) and the optical guide unit 110, so that one output diffraction It is possible to prevent the optical element from occupying an excessive area as a region occupied by other output diffraction optical elements, and thus prevent the actual optical path from being excessively distorted compared to the intended total reflection path.
  • Each of the two output diffractive optical elements 130 and 140 is preferably in contact with the other output diffractive optical elements 140 and 130.
  • the light output from the light source is output from the optical guide unit 110 through the input diffraction optical element 120-two output diffraction optical elements 130 and 140-other output diffraction optical elements 140 and 130.
  • the light output from the guide unit 110 is collected by each of the different output diffraction optical elements 140 and 130 to form one image light. Therefore, the two output diffractive optical elements 130 and 140 each need to be in contact with the other output diffractive optical elements 140 and 130 so that the output image light is not split from each other.
  • the side (S1) adjacent to the input diffractive optical device 120 having at least a predetermined width (the width in the vertical direction based on FIG. 5) in the predetermined area S where the two output diffractive optical devices 130 and 140 are disposed In the opposite side (S2) can be defined as a central area (M) long partitioned.
  • Two output diffraction optical elements 130 ′ and 140 ′ having different linear grating patterns may be cross-arranged in at least one dimension in the central region M.
  • the one-dimensional cross-arrangement means that the two output diffractive optical elements 130 ′ and 140 ′ are alternately arranged along the longitudinal direction of the central region M (left and right directions based on FIG. 5 ).
  • the output diffractive optical element 130 disposed above the predetermined region S on the side S1 adjacent to the input diffractive optical element 120 in the central region M.
  • Output diffraction having the same linear grating pattern as the output diffraction optical device 140 in which the output diffraction optical device 130 ′ having a linear grating pattern such as) is first arranged and then disposed below a predetermined area S
  • the optical elements 140 ′ are arranged, and different output diffractive optical elements 130 ′ and 140 ′ may be sequentially arranged alternately with each other.
  • Two output diffraction optical elements 130 ′ and 140 ′ having different linear grating patterns may be cross-arranged in a two-dimensional manner in a central region.
  • the two-dimensionally cross-arranged means that the two output diffractive optical elements 130' and 140' are not only in the longitudinal direction (left and right direction of FIG. 5) but also the width direction (up and down of FIG. 5) of the central region M. It means that they are arranged alternately along the direction). That is, it may be arranged in a matrix form.
  • the output diffraction optical element 130 having the same linear grating pattern as the output diffraction optical element 130 disposed above the predetermined region S in the central region M ') and the output diffraction optical element 140' having the same linear grating pattern as the output diffraction optical element 140 disposed below the predetermined area S, in a matrix form of m X n, in a two-dimensional manner.
  • m and n are positive integers, and may be selected as various values according to the size of the light guide plate.
  • Two output diffraction optical elements 130 ′ and 140 ′ having different linear grating patterns may be cross-arranged in a two-dimensional manner over the entire predetermined region S.
  • the two-dimensionally cross-arranged means that the two output diffraction optical elements 130 ′ and 140 ′ are not only the longitudinal direction (left and right direction of FIG. 5) of the predetermined region S, but also the width direction (reference of FIG. 5 ). It means that they are arranged alternately along the vertical direction). That is, it may be arranged in a matrix form.
  • two output diffraction optical elements 130' and 140' having different linear grating patterns in a predetermined area S are in the form of a 12 X 22 matrix. It can be alternately arranged.
  • the two output diffraction optical elements 130 ′ and 140 ′ having different linear grating patterns may be partially overlapped on the optical guide unit 110 due to a design error of a manufacturing process.
  • the two output diffractive optical elements 130 ′ and 140 ′ overlap each other on the optical guide unit 110. It is preferable not to form a region.
  • each of the two output diffractive optical elements 130' in the region where the two output diffractive optical elements 130' and 140' are intersected are preferably 4 mm or less, and more preferably 2 mm or less. desirable.
  • the size of a human pupil has an average size of about 2 mm in the daytime and about 4 mm in the night, two different output diffraction optical elements 130', 140 ′) and output from the light guide unit 110 is separated from each other so that it is not visually recognized.
  • different output diffractive optical elements 130 ′ and 140 ′ are shown to have the same width and/or length, but are not limited thereto, and different output diffractive optical elements 130 are cross-arranged. ', 140') may be arbitrarily varied.
  • light diffracted through each of the two output diffraction optical elements 130 and 140 and output from the optical guide unit 110 is an optical guide. It may be output with a predetermined emission angle ( ⁇ , ⁇ ') with respect to one surface of the unit 110.
  • the light (L4a') diffracted by the output diffraction optical element 130 located on the upper side and outputted is inclined downward with a predetermined emission angle ( ⁇ ) with respect to one surface of the optical guide unit 110.
  • the light (L4b') diffracted and output by the output diffraction optical element 140 located at the lower side has a predetermined emission angle ( ⁇ ') with respect to one surface of the optical guide unit 110 and is output by tilting upwards.
  • the output diffraction optical element 130 located on the upper side and the output diffraction optical element 130 ′ of the same linear grating pattern located in the center region are diffracted by a predetermined emission angle ( ⁇ ) with respect to one surface of the optical guide unit 110.
  • the area occupied by the light (L4a') tilted downward with) is diffracted by the output diffraction optical element 23 located above the diffraction light guide plate 20 as described above, and the optical guide unit 21 It is larger than the area occupied by the light L4a output by tilting downward with a predetermined emission angle ⁇ with respect to one side of.
  • the output diffraction optical device 140 located at the lower side and the output diffraction optical device 140 ′ of the same linear grating pattern located in the center region, and a predetermined emission angle ( ⁇ ) with respect to one surface of the optical guide unit 110.
  • the area occupied by the light L4b' which is tilted upward with') is diffracted by the output diffraction optical element 23 located below the diffraction light guide plate 20 as described above, and is then diffracted by the light guide unit 21 ) Is larger than the area occupied by the light L4b output by tilting upwards with a predetermined exit angle ⁇ '.
  • the crossing region I'in which the light L4b' output by tilting upward with a predetermined emission angle ⁇ 'with respect to one surface of the part 110 crosses each other is the diffractive light guide plate 20 as described above. According to the light (L4a, L4b) may have a longer length in the vertical direction than the crossing region (I) crossing each other.
  • the cross-section (I') can be formed long at a position spaced apart from one surface of the optical guide unit 110 by an eye relief (Eye Reilif), the advantage of being able to respond widely to the pupils of users having various physical conditions. This can be.
  • Each of the diffractive optical elements 120, 130, and 140 may include a linear grating repeatedly formed at a predetermined pitch P1, P2, and P3. Such a linear grid may have a protruding shape.
  • Each of the diffractive optical elements 120, 130, 140 has a grating vector V1, defined as a'size' inversely proportional to the pitches P1, P2, P3 of the linear gratings and a'direction' perpendicular to the direction in which the linear gratings extend. V2, V3).
  • the sizes of the lattice vectors V1, V2, and V3 may be defined by Equation 1 below.
  • the sum of the grating vectors V1, V2, and V3 of the input diffractive optical element 120 and the two output diffractive optical elements 130 and 140 has a magnitude of zero.
  • the grating vectors (V1, V2, V3) of the input diffraction optical element 120 and the two output diffraction optical elements 130, 140 have the same size, and the input diffraction optical element 120 and the two It is preferable that the grating vectors (V1, V2, V3) of each of the output diffraction optical elements 130 and 140 form an angle of 60° to each other. This is because all of the diffractive optical elements 120, 130, and 140 can be molded by one mold having the same pitch of the grating pattern.
  • the input diffraction optical device 120 has a horizontal line H parallel to the x-axis and a linear grating forming an angle of 90°, as shown in FIG. 6A, and two output diffraction optical devices 130 , 140), the output diffraction optical element 130 located on the upper side of the predetermined area S has a horizontal line H parallel to the x-axis and a linear grating forming an angle of -30°, as shown in FIG. 6B.
  • the output diffraction optical element 140 located below the predetermined region S may have a linear grating forming an angle of +30° with a horizontal line H parallel to the x-axis, as shown in FIG. 6C.
  • the pitches P1, P2, and P3 of each of the linear gratings are all the same, so that the sizes of the grating vectors V1, V2, and V3 of the diffractive optical elements 120, 130, and 140 are all the same. Since the direction of the grating vectors (V1, V2, V3) is perpendicular to the direction in which the respective linear gratings are extended, the direction of the grating vector (V1) of the input diffraction optical element 120 is parallel to the x-axis direction, and is predetermined.
  • the direction of the grating vector (V2) of the output diffraction optical element 130 located at the upper side of the region (S) forms an angle of -120° to the x-axis direction, and the output diffraction optics located at the lower side of the predetermined region (S).
  • the direction of the lattice vector V3 of the device 140 may form an angle of +120° to the x-axis direction. Accordingly, the grating vectors (V1, V2, V3) of the input diffractive optical element 120 and the two output diffractive optical elements (130, 140) form an angle of 60° to each other, and each grating vector (V1, The sum of V2 and V3) has a magnitude of zero.
  • the two output diffraction optical elements 130 and 140 are provided on the same plane on the optical guide unit 110.
  • two output diffraction optical elements 130 and 140 are provided on one surface 110a of the optical guide unit 110. Since the two output diffraction optical elements 130 and 140 are configured not to form overlapping regions on the same plane on the optical guide unit 110, one output diffraction optical element 130, 140 is manufactured.
  • the linear gratings of the two output diffractive optical elements 130 and 140 can be formed at once. There is an advantage.
  • a display device may include a light source (not shown) that outputs image light forming an image, and a diffraction light guide plate 100 according to an aspect of the present invention.
  • the image light output from the light source is input and diffracted to the input diffraction optical element 120, and is coupled to the two output diffraction optical elements 130, 140, and the two output diffraction optical elements 130, 140 are coupled.
  • the received light is diffracted to expand one-dimensionally, and the one-dimensionally expanded light may be coupled to other output diffraction optical elements 140 and 130 and output from the light guide unit 110 by diffraction.
  • the viewing angle is more than when the image light is output from the optical guide unit 110 with only a single diffractive optical element.
  • a central region that has at least a predetermined width within a predetermined region (S) and is elongated from the side (S1) adjacent to the input diffraction optical element 120 to the opposite side (S2).
  • the two output diffraction optical elements of different linear grating patterns are intersected at least one-dimensionally, and the crossing area I'is spaced apart from one surface of the optical guide unit 110 by an eye relief (Eye Reilif). It is possible to form a long bar, has the advantage of being able to respond widely to the pupils of users having various physical conditions by forming a so-called i-motion box wide.
  • FIG. 10 is a view showing a simulation result of light output from a diffractive light guide plate according to a comparative example of the present invention
  • FIG. 11 is a view showing an image output by the diffractive light guide plate according to a comparative example of the present invention.
  • the comparative example is a diffractive light guide plate in which two output diffractive optical elements are arranged separately up and down, but the two output diffractive optical elements are not cross-arranged along the length direction of the optical guide part.
  • FIG. 10(a) is a simulation of the optical path output through the output diffraction optical element when light is incident perpendicularly to the input diffractive optical element side
  • FIG. 10(b) is a vertical reference to the input diffraction optical element side. It is a simulation of the optical path output through the output diffraction optical element when the light is incident at an angle of 5 ⁇ . Simulation was carried out through Virtual Lab software (Lighttrans).
  • FIG. 12 is a view showing a simulation result of light output from a diffractive light guide plate according to an embodiment of the present invention.
  • An embodiment relates to a diffractive light guide plate in which two output diffractive optical elements are two-dimensionally cross-arranged within a predetermined area.
  • Figure 12 (a) is a simulation of the optical path output through the output diffraction optical device when light is incident perpendicular to the input diffractive optical device side
  • Figure 12 (b) is a reference perpendicular to the input diffractive optical device side. It is a simulation of the optical path output through the output diffraction optical element when the light is incident at an angle of 5 ⁇ .

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)

Abstract

Mode de réalisation selon un aspect de la présente invention concernant une plaque de guidage de lumière à diffraction qui comprend une partie de guidage de lumière pour guider la lumière ; un élément optique de diffraction d'entrée dans lequel la lumière émise par une source de lumière est entrée de façon à diffracter la lumière entrée, guidant ainsi la lumière diffractée sur la partie de guidage de lumière ; et deux éléments optiques de diffraction ayant différents motifs de réseau linéaire qui sont agencés dans une région prédéterminée de la partie de guidage de lumière, chacun des deux éléments optiques de diffraction étant formé de telle sorte que la lumière est reçue à partir de l'élément optique de diffraction d'entrée et que la lumière reçue peut se déplacer vers un élément optique de diffraction différent, chacun des deux éléments optiques de diffraction est formé de telle sorte que la lumière est reçue à partir d'un élément optique de diffraction différent et la lumière reçue est émise par le guide de lumière au moyen d'une diffraction, et les deux éléments optiques de diffraction de différents motifs de réseau linéaire sont agencés en croix au moins dans une dimension dans une région centrale divisée pour avoir au moins une largeur prédéterminée dans la région prédéterminée et pour être long d'un côté qui est adjacent à l'élément optique de diffraction d'entrée vers le côté opposé de celui-ci.
PCT/KR2020/002591 2019-02-22 2020-02-24 Plaque de guidage de lumière à diffraction et dispositif d'affichage la comprenant WO2020171666A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202080006083.9A CN112997109B (zh) 2019-02-22 2020-02-24 衍射导光板以及包括其的显示装置
EP20760197.2A EP3865929B1 (fr) 2019-02-22 2020-02-24 Plaque de guidage de lumière à diffraction et dispositif d'affichage la comprenant
JP2021532299A JP7183422B2 (ja) 2019-02-22 2020-02-24 回折導光板およびこれを含むディスプレイ装置
US17/299,281 US11953711B2 (en) 2019-02-22 2020-02-24 Diffractive light guide plate and display device including same

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2019-0021188 2019-02-22
KR20190021188 2019-02-22
KR1020200021640A KR102330600B1 (ko) 2019-02-22 2020-02-21 회절 도광판 및 이를 포함하는 디스플레이 장치
KR10-2020-0021640 2020-02-21

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP3730991A4 (fr) * 2018-08-22 2021-03-10 Lg Chem, Ltd. Plaque guide de lumière à diffraction et dispositif d'affichage la comprenant
EP4226194A4 (fr) * 2020-11-25 2024-10-30 Vuzix Corp Guide de lumière d'image avec optique diffractive zonée

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US20150277014A1 (en) * 2012-10-05 2015-10-01 Nokia Technologies Oy Apparatus and Method for Capturing Images
KR20160113195A (ko) * 2014-01-31 2016-09-28 캐논 유.에스.에이. 인코포레이티드 컬러 내시경을 위한 장치 및 방법
KR20170039655A (ko) * 2014-08-03 2017-04-11 웨이브 옵틱스 엘티디 출사동 확장 회절 광학 웨이브가이딩 장치
US20170179680A1 (en) * 2015-12-17 2017-06-22 Finisar Corporation Surface coupled systems
WO2018220266A1 (fr) * 2017-06-02 2018-12-06 Dispelix Oy Élément de diffraction à réseaux doublement périodiques

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Publication number Priority date Publication date Assignee Title
US20150277014A1 (en) * 2012-10-05 2015-10-01 Nokia Technologies Oy Apparatus and Method for Capturing Images
KR20160113195A (ko) * 2014-01-31 2016-09-28 캐논 유.에스.에이. 인코포레이티드 컬러 내시경을 위한 장치 및 방법
KR20170039655A (ko) * 2014-08-03 2017-04-11 웨이브 옵틱스 엘티디 출사동 확장 회절 광학 웨이브가이딩 장치
US20170179680A1 (en) * 2015-12-17 2017-06-22 Finisar Corporation Surface coupled systems
WO2018220266A1 (fr) * 2017-06-02 2018-12-06 Dispelix Oy Élément de diffraction à réseaux doublement périodiques

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3730991A4 (fr) * 2018-08-22 2021-03-10 Lg Chem, Ltd. Plaque guide de lumière à diffraction et dispositif d'affichage la comprenant
US11906773B2 (en) 2018-08-22 2024-02-20 Lg Chem, Ltd. Diffraction light guide plate and display device including the same
EP4226194A4 (fr) * 2020-11-25 2024-10-30 Vuzix Corp Guide de lumière d'image avec optique diffractive zonée

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