CN113514988B - Zoom liquid crystal lens and driving method thereof - Google Patents
Zoom liquid crystal lens and driving method thereof Download PDFInfo
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- CN113514988B CN113514988B CN202110463958.4A CN202110463958A CN113514988B CN 113514988 B CN113514988 B CN 113514988B CN 202110463958 A CN202110463958 A CN 202110463958A CN 113514988 B CN113514988 B CN 113514988B
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- 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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- 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
- G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
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- 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
- G02F1/29—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 position or the direction of light beams, i.e. deflection
Abstract
The invention discloses a zoom liquid crystal lens and a driving method thereof, wherein the zoom liquid crystal lens comprises: the display panel comprises a first substrate and a second substrate, wherein a first electrode layer is arranged on one surface of the first substrate close to the second substrate, a second electrode layer is arranged on one surface of the second substrate close to the first substrate, the first electrode layer comprises a plurality of first electrodes arranged in rows or columns, and the second electrode layer comprises a plurality of second electrodes arranged in columns or rows; when a first driving voltage is applied to the first electrode of one row or column and a second driving voltage is applied to the second electrode of one column or row, the microlenses in the target area in the microlens array have a first focal length, the microlenses in other areas in the microlens array have a second focal length, and the first focal length is different from the second focal length. The invention can reduce the aberration of the edge of the lens and improve the imaging definition.
Description
Technical Field
The invention relates to the technical field of liquid crystal lenses, in particular to a zoom liquid crystal lens and a driving method thereof.
Background
Spherical aberration is caused by the fact that rays with different off-axis distances form different angles of incidence on the lens surface. When the parallel light passes through the edge of the lens (the far-axis light), the focal point of the parallel light is closer to the lens; while the light passing through the center of the lens (paraxial light) has its focal point located farther away from the lens (the amount by which the focal points are offset along the optical axis is referred to as longitudinal spherical aberration). Due to such aberration, flare (Halo) generated by light passing through the edge portion of the lens is formed around an image formed by paraxial light passing through the central portion of the lens, and the formed image is perceived as blurred, and the whole screen looks like a yarn covered on the screen, and becomes a gray-covered image lacking sharpness.
The near-eye display device forms stereoscopic vision based on the fact that the left eye and the right eye receive two slightly different images, and the focusing distance is not completely equal to the focusing distance of two eyes on the same object when the human crystalline lens adjusts the convexity of the human crystalline lens to enable the object to be clearly imaged on the retina, so that discomfort such as dizziness and the like of a user can be caused frequently, and the visual convergence adjusting conflict can be effectively relieved by using the variable-focus liquid crystal lens technology.
In the prior art, when a single liquid crystal lens is used for imaging, because the lens is large in size and the optical center is fixed, when a field of view is large, an object point at the edge is far away from the optical axis, the light beam is large in inclination, and large aberration is caused after the light beam passes through the lens, so that the imaging definition is influenced.
Disclosure of Invention
Therefore, the present invention is directed to a variable focal length liquid crystal lens and a driving method thereof, which can reduce aberration at the edge of the lens and improve image sharpness.
The present invention provides a zoom liquid crystal lens comprising:
the electrode structure comprises a first substrate and a second substrate, wherein a first electrode layer is arranged on one surface of the first substrate close to the second substrate, a second electrode layer is arranged on one surface of the second substrate close to the first substrate, the first electrode layer comprises a plurality of first electrodes arranged in rows or columns, and the second electrode layer comprises a plurality of second electrodes arranged in columns or rows;
the first electrode layer and the second electrode layer form a micro-lens array and form a plurality of optical centers, when a first driving voltage is applied to the first electrode of one row or one column and a second driving voltage is applied to the second electrode of one row or one column, micro-lenses in a target area in the micro-lens array have a first focal length, micro-lenses in other areas in the micro-lens array have a second focal length, and the first focal length is different from the second focal length.
According to the variable-focus liquid crystal lens provided by the invention, the two electrode layers between the first substrate and the second substrate form the microlens array which is regularly arranged according to rows or columns, a plurality of optical centers are formed, when a target object watched by human eyes is changed, the optical centers of the formed microlenses can move along with the change of the optical centers, the aberration of the lens edge can be effectively reduced, and the imaging definition is improved.
Optionally, the first electrode layer includes a plurality of first electrodes arranged according to the row in the horizontal direction, the second electrode layer includes a plurality of second electrodes arranged according to the row in the vertical direction, each is listed as be formed with a plurality of polygon trompils on the second electrode, be equipped with the clearance between two arbitrary adjacent rows of first electrodes and between two adjacent rows of second electrodes, and not switch on each other, the center-to-center line of two arbitrary adjacent polygon trompils on two adjacent rows of second electrodes forms preset angle with the horizontal direction, be equipped with a plurality of evenly distributed breachs on the first electrode, the breach with electrode pattern in the second electrode corresponds.
Optionally, the first electrode layer includes a plurality of first electrodes of arranging according to the row on the vertical direction, the second electrode layer includes a plurality of second electrodes of arranging according to the row on the horizontal direction, be formed with a plurality of polygon trompils on each row the second electrode, be equipped with the clearance between arbitrary adjacent two first electrodes and between two adjacent rows of second electrodes, and not conducting each other, the center-to-center line and the vertical direction of arbitrary two adjacent polygon trompils on two adjacent rows of second electrodes form preset angle, be equipped with a plurality of evenly distributed breachs on the first electrode, the breach with electrode pattern in the second electrode corresponds.
Optionally, the first electrode layer includes a plurality of first electrodes that slope setting, arrange according to the row in the vertical direction, the second electrode layer includes a plurality of second electrodes that arrange according to the row in the horizontal direction, is equipped with the clearance between the first electrode of arbitrary adjacent two columns and between two adjacent rows of second electrodes, and does not switch on each other, is provided with a plurality of equidistant circular trompils of arranging on every line of second electrode, and the centre of a circle line of two arbitrary adjacent circular trompils on two adjacent rows of second electrodes forms preset angle with the vertical direction.
Optionally, the first electrode layer includes a plurality of first electrodes arranged in a horizontal direction in a row, the second electrode layer includes a plurality of second electrodes arranged in a vertical direction in an inclined manner and arranged in a row, gaps are provided between any two adjacent rows of the first electrodes and between two adjacent rows of the second electrodes, the second electrodes are not conducted with each other, a plurality of circular openings arranged at equal intervals are provided on each row of the second electrodes, and a line of centers of circles of the plurality of circular openings on each row of the second electrodes forms a preset angle with the vertical direction.
Optionally, the first electrode layer includes a plurality of first electrodes arranged in a horizontal direction in rows, the second electrode layer includes a plurality of second electrodes arranged in a vertical direction in columns, gaps are provided between any two adjacent columns of the first electrodes in rows and between any two adjacent columns of the second electrodes, and the gaps are not connected to each other, each column of the second electrodes is provided with a plurality of circular openings arranged at equal intervals, and a circle center connecting line of at least 2 arbitrary circular openings on each column of the second electrodes is parallel to the vertical direction.
Optionally, the first electrode layer includes a plurality of first electrodes arranged in a row in a vertical direction, the second electrode layer includes a plurality of second electrodes arranged in a row in a horizontal direction, gaps are provided between any two adjacent rows of the first electrodes and between two adjacent rows of the second electrodes, and the second electrodes are not conducted with each other, a plurality of circular openings arranged at equal intervals are provided on each row of the second electrodes, and a circle center connection line of at least 2 arbitrary circular openings on each row of the second electrodes is parallel to the horizontal direction.
Optionally, a third electrode layer is arranged on one surface of the second substrate, which is close to the first substrate, and is located between the second electrode layer and the second substrate, an insulating layer is arranged between the third electrode layer and the second electrode layer, and a plurality of via holes are arranged on the insulating layer.
Optionally, the first electrode layer includes a plurality of first electrodes arranged in a row in a vertical direction, a gap is provided between any two adjacent rows of the first electrodes, and the first electrodes are not conducted with each other, the second electrode layer includes a plurality of concentric ring electrodes, the plurality of concentric ring electrodes form microlenses arranged in an array, and the concentric ring electrodes at corresponding positions in each microlens are connected in series on the third electrode layer in a horizontal direction through the via holes.
Optionally, the first electrode layer includes a plurality of first electrodes arranged in a row in the horizontal direction, a gap is provided between any two adjacent rows of the first electrodes, and the first electrodes are not conducted with each other, the second electrode layer includes a plurality of concentric ring electrodes, and a plurality of the concentric ring electrodes form microlenses arranged in an array, and the concentric ring electrodes at corresponding positions in each microlens pass through the via holes to be connected in series in the vertical direction on the third electrode layer.
The invention also provides a driving method of the zoom liquid crystal lens, which is applied to the zoom liquid crystal lens and comprises the following steps:
acquiring the position and the depth of field of a target object watched by human eyes through sight tracking to determine a target area where a micro lens with a first focal length needs to be provided and a corresponding first driving voltage;
addressing the micro lens array according to a target area where micro lenses with a first focal length need to be provided are located, so as to determine a target row-column position of the micro lenses with the first focal length need to be provided;
inputting a first driving voltage to the first electrode and the second electrode of the target row and column positions in the micro lens array, and inputting a second driving voltage to the first electrode and the second electrode of other row and column positions for driving, wherein the first driving voltage is different from the second driving voltage.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of embodiments of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a variable focus liquid crystal lens according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first electrode in a variable focus liquid crystal lens according to a first embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second electrode in a variable focus liquid crystal lens provided in a first embodiment of the present invention;
FIG. 4 is a schematic partial display view of a microlens array in a variable focus liquid crystal lens provided in accordance with a first embodiment of the present invention;
fig. 5 is a schematic structural diagram of a first electrode in a variable focus liquid crystal lens according to a second embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second electrode in a variable focus liquid crystal lens provided in a second embodiment of the present invention;
fig. 7 is a schematic structural diagram of a first electrode in a variable focus liquid crystal lens according to a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a second electrode in a variable focus liquid crystal lens provided in a third embodiment of the present invention;
fig. 9 is a schematic structural diagram of a first electrode in a variable focus liquid crystal lens according to a fourth embodiment of the present invention;
fig. 10 is a schematic structural diagram of a second electrode in a variable focus liquid crystal lens according to a fourth embodiment of the present invention;
fig. 11 is a schematic structural diagram of a first electrode in a variable focus liquid crystal lens according to a fifth embodiment of the present invention;
fig. 12 is a schematic structural diagram of a second electrode in a variable focus liquid crystal lens according to a fifth embodiment of the present invention;
fig. 13 is a schematic structural diagram of a first electrode in a variable focus liquid crystal lens according to a sixth embodiment of the present invention;
fig. 14 is a schematic structural diagram of a second electrode in a variable focus liquid crystal lens according to a sixth embodiment of the present invention;
fig. 15 is a schematic structural view of a variable focus liquid crystal lens provided in a seventh embodiment of the present invention;
fig. 16 is a schematic structural diagram of a first electrode in a variable focus liquid crystal lens according to a seventh embodiment of the present invention;
fig. 17 is a schematic structural view of a second electrode in a variable focus liquid crystal lens according to a seventh embodiment of the present invention;
fig. 18 is a schematic structural diagram of a first electrode in a variable focus liquid crystal lens according to an eighth embodiment of the present invention;
fig. 19 is a schematic structural diagram of a second electrode in a variable focus liquid crystal lens according to an eighth embodiment of the present invention;
fig. 20 is a flowchart of a driving method of a variable focus liquid crystal lens according to a ninth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
First embodiment
Referring to fig. 1 to 4, a variable focus liquid crystal lens 100 according to a first embodiment of the invention includes: the display device comprises a first substrate 101 and a second substrate 102, wherein a first electrode layer 103 is arranged on one surface of the first substrate 101 close to the second substrate 102, a second electrode layer 104 is arranged on one surface of the second substrate 102 close to the first substrate 101, the first electrode layer 103 comprises a plurality of first electrodes arranged in rows or columns, the second electrode layer 104 comprises a plurality of second electrodes arranged in columns or rows, and the first electrodes and the second electrodes are made of transparent electrode materials such as ITO.
When a first driving voltage is applied to the first electrode in one row or one column and a second driving voltage is applied to the second electrode in one column or one row, the microlenses in the target area in the microlens array have a first focal length, the microlenses in other areas in the microlens array have a second focal length, and the first focal length is different from the second focal length.
In this embodiment, the first electrode layer 103 includes a plurality of first electrodes R1, R2, R3, …, Rm arranged in a horizontal direction in rows, the second electrode layer 104 includes a plurality of second electrodes C1, C2, C3, …, Cn arranged in a vertical direction in columns, each column of the second electrodes is formed with a plurality of polygonal openings such as polygonal openings H11, H21, H31, …, Hm1, H11, H21, H31, …, Hm1 and other polygonal openings inner electrode patterns, specifically in this embodiment, the polygonal openings H11, H21, H31, …, Hm1 are in a shape of a regular six, and gaps are provided between any two adjacent rows of the first electrodes and between two adjacent columns of the second electrodes, and are not connected to each other, a connecting line of centers of any two adjacent polygonal openings on two columns of the second electrodes forms a predetermined angle α with the horizontal direction, for example, and α is 30 degrees, the first electrode is provided with a plurality of uniformly distributed notches, the notches correspond to the electrode patterns in the second electrode, and the shape of the polygonal openings H11, H21, H31, … and Hm1 in the embodiment is a regular six-deformation shape, and correspondingly, the notches on the first electrode are trapezoidal notches. Specifically, the centers of the hexagonal openings between two adjacent rows are spaced by a distance d in the vertical direction, and correspondingly, the height of the trapezoidal notch on the first electrode is also d.
As shown in fig. 4, when the microlens array in the variable-focus liquid crystal lens 100 is operated, a target object watched by human eyes is located in an area a in fig. 4, a liquid crystal lens having a first focal length is formed by the microlenses in the area according to the depth of field, a first voltage is supplied, and a voltage difference Δ V is set to 5V. At this time, a voltage of 0V may be inputted to the column of the second electrode C5 in the second electrode layer 104, a voltage of 5V may be inputted to the column of the second electrode R3 in the first electrode layer 103, and the liquid crystal lens formed in the a region has the first focal length. The liquid crystal lens forming the second focal length in most regions except the region a needs to provide a second voltage different from the first voltage, and the second voltage is set to be 2.5V, and a voltage of 2.5V is applied to all other rows (except R3) synchronously.
In addition, it should be noted that, in this embodiment, the polygonal opening is located on the second electrode, and in practical implementation, the polygonal opening may also be located on the first electrode.
Second embodiment
Referring to fig. 5 and fig. 6, a variable focal length liquid crystal lens according to a second embodiment of the present invention is different from the first embodiment in that the first electrode in the first electrode layer 103 and the second electrode in the second electrode layer 104 are arranged differently.
In this embodiment, the first electrode layer 103 includes a plurality of first electrodes C1, C2, C3, …, Cn arranged in columns in a vertical direction, the second electrode layer 104 includes a plurality of second electrodes R1, R2, R3, …, Rm arranged in rows in a horizontal direction, a plurality of polygonal openings H11, H21, H31, …, Hm1, for example, specifically regular hexagonal openings, are formed on each column of the second electrodes, gaps are formed between any two adjacent columns of the first electrodes and between two adjacent rows of the second electrodes, and are not connected to each other, a center line of any two adjacent polygonal openings on two adjacent rows of the second electrodes forms a predetermined angle with the vertical direction, a plurality of uniformly distributed gaps are formed on the first electrodes, and the gaps correspond to electrode patterns in the second electrodes.
Third embodiment
Referring to fig. 7 and 8, a variable focus liquid crystal lens according to a third embodiment of the present invention is different from the first embodiment in the arrangement of the first electrode in the first electrode layer 103 and the second electrode in the second electrode layer 104.
In this embodiment, the first electrode layer 103 includes a plurality of first electrodes C1, C2, C3, …, Cn arranged in columns and inclined in the vertical direction, preferably, the first electrodes form an angle of 30 ° with the vertical direction, the second electrode layer 104 includes a plurality of second electrodes R1, R2, R3, …, Rm arranged in rows and arranged in the horizontal direction, gaps are provided between any two adjacent columns of first electrodes and between two adjacent rows of second electrodes and are not conductive to each other, each row of second electrodes is provided with a plurality of circular openings 11,12,21,22, …,1N, …, M1 …, MN arranged at equal intervals, and a connection line of centers of any two adjacent circular openings on two adjacent rows of second electrodes forms a predetermined angle with the vertical direction, for example, the connection line of centers of the circular openings 11 and 21 forms an angle of 30 ° with the vertical direction.
Fourth embodiment
Referring to fig. 9 and 10, a variable focus liquid crystal lens according to a fourth embodiment of the invention is different from the third embodiment in the arrangement of the first electrode in the first electrode layer 103 and the second electrode in the second electrode layer 104.
In this embodiment, the first electrode layer 103 includes a plurality of first electrodes R1, R2, R3, …, Rm arranged in a horizontal direction in rows, and the second electrode layer 104 includes a plurality of second electrodes C1, C2, C3, …, Cn arranged in columns and inclined in a vertical direction, and gaps are provided between any two adjacent rows of the first electrodes and between two adjacent columns of the second electrodes, and are not conductive to each other, each column of the second electrodes is provided with a plurality of circular openings 11,12,21,22, …,1N, …, M1 …, MN, and the like arranged at equal intervals, and a connection line of centers of the plurality of circular openings on each column of the second electrodes forms a predetermined angle with the vertical direction.
Fifth embodiment
Referring to fig. 11 and 12, a variable focal length liquid crystal lens according to a fifth embodiment of the invention is different from the first embodiment in the arrangement of the first electrode in the first electrode layer 103 and the second electrode in the second electrode layer 104.
In this embodiment, the first electrode layer 103 includes a plurality of first electrodes R1, R2, R3, …, Rm arranged in rows in a horizontal direction, the second electrode layer 104 includes a plurality of second electrodes C1, C2, C3, …, Cn arranged in columns in a vertical direction, gaps are provided between any two adjacent columns of row first electrodes and between two adjacent columns of second electrodes, and are not electrically connected to each other, each column of second electrodes is provided with a plurality of circular openings 11,12,21,22, …,1N, …, M1 …, MN, and the like arranged at equal intervals, and a connection line of circle centers of at least 2 circular openings on each column of second electrodes is parallel to the vertical direction.
Sixth embodiment
Referring to fig. 13 and 14, a variable focal length liquid crystal lens according to a sixth embodiment of the present invention is different from the fifth embodiment in the arrangement of the first electrode in the first electrode layer 103 and the second electrode in the second electrode layer 104.
In this embodiment, the first electrode layer 103 includes a plurality of first electrodes C1, C2, C3, …, Cn arranged in columns in a vertical direction, the second electrode layer 104 includes a plurality of second electrodes R1, R2, R3, …, Rm arranged in rows in a horizontal direction, gaps are provided between any two adjacent columns of first electrodes and between two adjacent rows of second electrodes, and are not conductive to each other, each row of second electrodes is provided with a plurality of circular openings 11,12,21,22, …,1N, …, M1 …, MN, etc. arranged at equal intervals, and a connection line of centers of at least 2 circular openings on each row of second electrodes is parallel to the horizontal direction.
Seventh embodiment
Referring to fig. 15 to 17, a variable focus liquid crystal lens 200 according to a seventh embodiment of the present invention includes: the electrode structure comprises a first substrate 201 and a second substrate 202, wherein a first electrode layer 203 is arranged on one surface of the first substrate 201 close to the second substrate 202, a second electrode layer 204 is arranged on one surface of the second substrate 202 close to the first substrate 201, the first electrode layer 201 comprises a plurality of first electrodes arranged in rows or columns, and the second electrode layer 204 comprises a plurality of second electrodes arranged in columns or rows.
When a first driving voltage is applied to the first electrode in one row or one column and a second driving voltage is applied to the second electrode in one column or one row, the microlenses in the target area in the microlens array have a first focal length, the microlenses in other areas in the microlens array have a second focal length, and the first focal length is different from the second focal length.
In this embodiment, a third electrode layer 205 is disposed on a surface of the second substrate 202 close to the first substrate 201, the third electrode layer 205 is located between the second electrode layer 204 and the second substrate 202, an insulating layer 206 is disposed between the third electrode layer 205 and the second electrode layer 204, and a plurality of via holes (not shown) are disposed on the insulating layer 206.
In this embodiment, the first electrode layer 203 includes a plurality of first electrodes C1, C2, C3, …, Cn arranged in a row in the vertical direction, and a gap is formed between any two adjacent rows of the first electrodes and the first electrodes are not electrically connected to each other, the second electrode layer 204 includes a plurality of concentric ring electrodes 2041, the plurality of concentric ring electrodes form microlenses arranged in an array, and the concentric ring electrodes 2041 at corresponding positions in each microlens are connected in series on the third electrode layer 205 in the horizontal direction through the via holes.
Eighth embodiment
Referring to fig. 18 and fig. 19, a variable focal length liquid crystal lens according to an eighth embodiment of the invention is different from the seventh embodiment in the arrangement and structure of the first electrode in the first electrode layer 203 and the second electrode in the second electrode layer 204.
In this embodiment, the first electrode layer 203 includes a plurality of first electrodes R1, R2, R3, …, Rm arranged in a horizontal direction in rows, a gap is formed between any two adjacent rows of first electrodes, and the first electrodes are not electrically connected to each other, the second electrode layer 204 includes a plurality of concentric ring electrodes 2041, the plurality of concentric ring electrodes 2041 form microlenses arranged in an array, and the concentric ring electrodes 2041 at corresponding positions in each microlens are connected in series in a vertical direction on the third electrode layer 205 through the via holes.
Ninth embodiment
Referring to fig. 20, a ninth embodiment of the present invention provides a driving method of a variable focal length liquid crystal lens, applied to the variable focal length liquid crystal lens in any one of the above embodiments, the driving method including:
s101, acquiring the position and the depth of field of a target object watched by human eyes through sight tracking to determine a target area where a micro lens with a first focal length needs to be provided and a corresponding first driving voltage;
s102, addressing the micro lens array according to a target area where a micro lens with a first focal length needs to be provided so as to determine a target row-column position of the micro lens with the first focal length needs to be provided;
s103, inputting a first driving voltage to the first electrode and the second electrode of the target row and column positions in the micro lens array, and inputting a second driving voltage to the first electrode and the second electrode of other row and column positions for driving, wherein the first driving voltage is different from the second driving voltage.
According to the method, the position and the size of a target object gazed by human eyes are determined through sight line tracking, the range of the micro lens and the electrode which need to provide the first focal length is determined, the micro lens which needs to be driven is addressed, and corresponding driving voltage is provided according to the depth of field of the target object, so that the size of the first focal length and the size of the second focal length are adjusted.
In any time, the driving voltage is set based on the first focal length, so that different first focal lengths correspond to different driving voltages, and when the depth of field of the target object changes, the micro-lens array is driven to zoom in real time, so that the target object watched by human eyes is kept clear.
In summary, according to the variable focus liquid crystal lens and the driving method thereof provided by the present invention, the two electrode layers between the first substrate and the second substrate form a microlens array arranged in a certain rule according to rows or columns, so as to form a plurality of optical centers, and in cooperation with the line-of-sight tracking, when the target object gazed by human eyes changes, the optical centers of the formed microlenses can move along with the optical centers, thereby effectively reducing the aberration at the edge of the lens and improving the imaging definition. By means of a simple passive driving method, the liquid crystal micro lenses in a specific target area can be made to have a first focal length, and the micro lenses in other areas can form a second focal length different from the first focal length of the micro lenses in the specific area, and as the micro lenses in the target area in the micro lens array have the first focal length and the micro lenses in other areas have the second focal length, when the liquid crystal micro lenses in the target area watched by human eyes are clearly imaged, the micro lenses in the non-watching areas can be blurred.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (9)
1. A variable focus liquid crystal lens, comprising:
the electrode structure comprises a first substrate and a second substrate, wherein a first electrode layer is arranged on one surface of the first substrate close to the second substrate, a second electrode layer is arranged on one surface of the second substrate close to the first substrate, the first electrode layer comprises a plurality of first electrodes arranged in rows or columns, and the second electrode layer comprises a plurality of second electrodes arranged in columns or rows;
the first electrode layer and the second electrode layer form a micro-lens array and form a plurality of optical centers, when a first driving voltage is applied to the first electrode of one row or column and a second driving voltage is applied to the second electrode of one column or row, micro-lenses in a target area in the micro-lens array have a first focal length, micro-lenses in other areas in the micro-lens array have a second focal length, and the first focal length is different from the second focal length;
the first electrode layer comprises a plurality of first electrodes which are arranged in a row in the horizontal direction, the second electrode layer comprises a plurality of second electrodes which are arranged in a row in the vertical direction, a plurality of polygonal open holes are formed in each row of the second electrodes, gaps are formed between any two adjacent rows of the first electrodes and between any two adjacent rows of the second electrodes and are not conducted with each other, a preset angle is formed between the central connecting line of any two adjacent polygonal open holes in the two adjacent rows of the second electrodes and the horizontal direction, a plurality of uniformly distributed gaps are arranged on the first electrodes, and the gaps correspond to electrode patterns in the second electrodes;
the second base plate is close to the one side of first base plate is equipped with the third electrode layer, the third electrode layer is located the second electrode layer with between the second base plate, just the third electrode layer with there is the insulating layer between the second electrode layer, be equipped with a plurality of conducting holes on the insulating layer, it is a plurality of the conducting hole be used for with the second electrode layer with the third electrode layer is established ties on the horizontal direction or the vertical direction.
2. The variable focus liquid crystal lens as claimed in claim 1, wherein the first electrode layer comprises a plurality of first electrodes arranged in columns in a vertical direction, the second electrode layer comprises a plurality of second electrodes arranged in rows in a horizontal direction, a plurality of polygonal openings are formed in each column of the second electrodes, gaps are formed between any two adjacent columns of the first electrodes and between two adjacent rows of the second electrodes, the gaps are not connected with each other, a central connecting line of any two adjacent polygonal openings in two adjacent rows of the second electrodes forms a preset angle with the vertical direction, a plurality of uniformly distributed gaps are formed in the first electrodes, and the gaps correspond to electrode patterns in the second electrodes.
3. The variable focus liquid crystal lens according to claim 1, wherein the first electrode layer comprises a plurality of first electrodes arranged in a vertical direction in an inclined manner and arranged in columns, the second electrode layer comprises a plurality of second electrodes arranged in a horizontal direction in rows, a gap is formed between any two adjacent columns of the first electrodes and between two adjacent rows of the second electrodes, the first electrodes are not in conduction with each other, a plurality of circular openings are arranged in each row of the second electrodes at equal intervals, and a line connecting centers of any two adjacent circular openings on two adjacent rows of the second electrodes forms a preset angle with the vertical direction.
4. The variable focus liquid crystal lens as claimed in claim 1, wherein the first electrode layer comprises a plurality of first electrodes arranged in rows in a horizontal direction, the second electrode layer comprises a plurality of second electrodes arranged in columns in a vertical direction, a gap is formed between any two adjacent rows of the first electrodes and between two adjacent columns of the second electrodes, the first electrodes are not in conduction with each other, each column of the second electrodes is provided with a plurality of circular openings arranged at equal intervals, and a line of centers of the circular openings on each column of the second electrodes forms a predetermined angle with the vertical direction.
5. The variable focus liquid crystal lens of claim 1, wherein said first electrode layer comprises a plurality of first electrodes arranged in rows in a horizontal direction, said second electrode layer comprises a plurality of second electrodes arranged in columns in a vertical direction, a gap is provided between any two adjacent columns of row first electrodes and between any two adjacent columns of second electrodes, and the electrodes are not in conduction with each other, each column of second electrodes is provided with a plurality of circular openings arranged at equal intervals, and a line of centers of at least 2 circular openings of each column of second electrodes is parallel to the vertical direction.
6. The variable focus liquid crystal lens according to claim 1, wherein the first electrode layer comprises a plurality of first electrodes arranged in columns in a vertical direction, the second electrode layer comprises a plurality of second electrodes arranged in rows in a horizontal direction, a gap is arranged between any two adjacent columns of the first electrodes and between two adjacent rows of the second electrodes, the first electrodes are not connected with each other, each row of the second electrodes is provided with a plurality of circular openings arranged at equal intervals, and a connecting line of circle centers of at least 2 circular openings on each row of the second electrodes is parallel to the horizontal direction.
7. The variable focus liquid crystal lens of claim 1, wherein the first electrode layer comprises a plurality of first electrodes arranged in columns in a vertical direction, a gap is formed between any two adjacent columns of the first electrodes, the first electrodes are not in conduction with each other, the second electrode layer comprises a plurality of concentric ring electrodes, the plurality of concentric ring electrodes form microlenses arranged in an array, and the concentric ring electrodes at corresponding positions in each microlens are connected in series on the third electrode layer in a horizontal direction through the via holes.
8. The variable focus liquid crystal lens according to claim 1, wherein the first electrode layer comprises a plurality of first electrodes arranged in a horizontal direction in rows, a gap is provided between any two adjacent rows of the first electrodes, and the first electrodes are not electrically connected to each other, the second electrode layer comprises a plurality of concentric ring electrodes, the plurality of concentric ring electrodes form microlenses arranged in an array, and the concentric ring electrodes at corresponding positions in each microlens are connected in series on the third electrode layer in a vertical direction through the via holes.
9. A method of driving a variable focus liquid crystal lens, applied to the variable focus liquid crystal lens according to any one of claims 1 to 8, the method comprising:
acquiring the position and the depth of field of a target object watched by human eyes through sight tracking to determine a target area where a micro lens with a first focal length needs to be provided and a corresponding first driving voltage;
addressing the micro lens array according to a target area where micro lenses with a first focal length need to be provided are located, so as to determine a target row-column position of the micro lenses with the first focal length need to be provided;
inputting a first driving voltage to the first electrode and the second electrode of the target row and column positions in the micro lens array, and inputting a second driving voltage to the first electrode and the second electrode of other row and column positions for driving, wherein the first driving voltage is different from the second driving voltage.
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| CN114390182A (en) * | 2022-02-08 | 2022-04-22 | 维沃移动通信有限公司 | Shooting method and device and electronic equipment |
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