WO2022155891A1 - Filtre passe-bas optique variable, module de caméra le comprenant, système d'imagerie comprenant le module de caméra, téléphone intelligent comprenant le système d'imagerie, et procédé de commande du système d'imagerie - Google Patents

Filtre passe-bas optique variable, module de caméra le comprenant, système d'imagerie comprenant le module de caméra, téléphone intelligent comprenant le système d'imagerie, et procédé de commande du système d'imagerie Download PDF

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Publication number
WO2022155891A1
WO2022155891A1 PCT/CN2021/073304 CN2021073304W WO2022155891A1 WO 2022155891 A1 WO2022155891 A1 WO 2022155891A1 CN 2021073304 W CN2021073304 W CN 2021073304W WO 2022155891 A1 WO2022155891 A1 WO 2022155891A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
pass filter
low pass
optical low
variable optical
Prior art date
Application number
PCT/CN2021/073304
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English (en)
Inventor
Qing TONG
Sota Miyatani
Yingqing LIU
Takuya Anzawa
Original Assignee
Huawei Technologies Co., Ltd.
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
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to CN202180090764.2A priority Critical patent/CN116888524A/zh
Priority to PCT/CN2021/073304 priority patent/WO2022155891A1/fr
Publication of WO2022155891A1 publication Critical patent/WO2022155891A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/06—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the phase of light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2207/00—Control of exposure by setting shutters, diaphragms, or filters separately or conjointly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise

Definitions

  • the present disclosure relates to an Optical Low Pass Filter (OLPF) used in digital cameras and the like.
  • OLPF Optical Low Pass Filter
  • OLPF Optical Low Pass Filter
  • each birefringent plate used in the conventional OLPF is fixed, a plurality of birefringent plates are needed in order to separate light into a plurality of directions, and this results in an increase in thickness of the OLPF.
  • the increase in thickness of the OLPF restricts the use of the OLPF on smartphones which have a limited space between an imaging lens and an image sensor.
  • the vOLPF according to the above-mentioned configuration can make the thickness of the vOLPF thin because the liquid crystal layer comprises the birefringent function, and thereby said vOLPF is applicable to smartphones which have a limited space between the imaging lens and the image sensor.
  • the liquid crystal layer may comprise nematic liquid crystals, and the alignment pattern of one of the two opposing liquid crystal alignment layers may be the same as the alignment pattern of the other of the two opposing liquid crystal alignment layers.
  • the two opposing liquid crystal alignment layers may have one or more alignment directions.
  • the two opposing liquid crystal alignment layers may have alignment directions extending radially from the center of the vOLPF.
  • the transparent substrate may be non-birefringent.
  • the thickness of the vOLPF may range from 200 ⁇ m to 3,000 ⁇ m.
  • the thickness of the transparent substrate may range from 100 ⁇ m to 1,500 ⁇ m.
  • a camera module comprises: an imaging lens; an image sensor; and the above-mentioned vOLPF arranged between the imaging lens and the image sensor.
  • An imaging system comprises: the above-mentioned camera module; an Optical Low Pass Filter (OLPF) driver connected to the vOLPF; an image signal processor connected to the image sensor; a display; and a controller unit connected to the OLPF driver, the image sensor, the image signal processor, and the display.
  • OLPF Optical Low Pass Filter
  • the smartphone according to the above-mentioned configuration has a reduced thickness of the vOLPF and thereby can realize an even thinner smartphone.
  • the method for controlling the imaging system according to the above-mentioned aspect can easily control the birefringent function because only the liquid crystal layer comprises the birefringent function and thus there is no need to consider the mutual relationship with any birefringent plate.
  • the imaging system may comprise an automatic mode or a manual mode.
  • FIG. 2 (a) is a top view of the vOLPF according to the present disclosure seen from the side where incident light enters and FIG. 2 (b) is a cross-sectional view taken along line A-A in FIG. 2 (a) .
  • FIG. 3 is a plane view showing an exemplary pattern of the transparent electrode used in the vOLPF according to the present disclosure.
  • FIG. 4 is a perspective view showing an exemplary pattern of the alignment grooves formed in the liquid crystal alignment layer used in the vOLPF according to the present disclosure.
  • FIG. 5 is an exploded perspective view of the vOLPF which shows an exemplary aligning condition of the liquid crystal molecules in the liquid crystal layer when the liquid crystal alignment layer shown in FIG. 4 is used.
  • FIG. 7 is a block diagram which shows an imaging system comprising the vOLPF according to the present disclosure.
  • FIG. 8 is an exploded perspective view of a conventional Optical Low Pass Filter (OLPF) .
  • OLPF Optical Low Pass Filter
  • FIG. 8 shows an exemplary configuration of a conventional OLPF as a first embodiment.
  • the OLPF shown in FIG. 8 is composed of two birefringent plates 1, 4, and a wave plate 2 and IR cut filter 3 sandwiched between them.
  • Incident light L1 is separated into two light beams through the front birefringent plate 1, the two light beams are separated into four light beams through the rear birefringent plate 4, and the four light beams enter an image sensor 5. These four separated light beams can reduce the spatial frequency and thereby can reduce the occurrence of moiré.
  • the OLPF according to the first embodiment uses two birefringent plates, the thickness of the OLPF in the optical axis direction is thick. Accordingly, the above-mentioned OLPF is not suitable for use on smartphones which have a limited space between the imaging lens and the image sensor.
  • DSLR Digital Single-Lens Reflex
  • CRA chief ray angle
  • each birefringent plate in the OLPF according to the first embodiment is fixed, a plurality of birefringent plates are needed in order to separate light into a plurality of directions.
  • the OLPF according to the second embodiment comprises: a first birefringent plate having a transverse optic axis; a second birefringent plate having a longitudinal optic axis; a third birefringent plate having an optic axis at an angle of 45° with respect to the transverse direction; and a fourth birefringent plate having an optic axis at an angle of 90° with respect to the optic axis of the third birefringent plate.
  • the OLPF according to the second embodiment when the separation width of the incident light in the longitudinal and transverse directions by the first birefringent plate and the second birefringent plate is “a” , and the separation width of the incident light in the oblique direction by the third birefringent plate and the fourth birefringent plate is “b” , the width “b” is set larger than the width “a” (e.g. 1.15 ⁇ b/a ⁇ 3) . Based on the above configuration, the OLPF according to the second embodiment can reduce the occurrence of moiré in the oblique direction while maintaining the resolution in the longitudinal and transverse directions.
  • the OLPF according to the second embodiment uses four birefringent plates, the thickness of the OLPF in the optical axis direction is very thick. Consequently, it is not suitable for use on smartphones which have a limited space between the imaging lens and the image sensor.
  • the OLPF according to the second embodiment cannot solve the problem where the difference between the separation distance at the center position and the separation distance at the peripheral position is large due to the short back focal distance and the wide CRA of smartphones.
  • each birefringent plate in the OLPF according to the second embodiment is fixed, a plurality of birefringent plates are needed in order to separate light into a plurality of directions.
  • the OLPF according to the third embodiment comprises: a first birefringent plate; a first electrode; a liquid crystal layer; a second electrode; and a second birefringent plate, which are laminated in this order.
  • the liquid crystal layer uses TN (Twisted Nematic) liquid crystal and can control the low-pass characteristics according to the strength of the electric field applied via the first and second electrodes. Specifically, when the applied voltage is 0 V, the low-pass characteristics can be zero. Whereas, when a large voltage is applied, the low-pass characteristics can be maximum.
  • an intermediate voltage is applied, the incident light can be separated into three beams with an intermediate separation distance and thereby intermediate low-pass characteristics can be obtained.
  • the OLPF according to the third embodiment cannot control the low-pass characteristics according to the position in the field of view, the OLPF according to the third embodiment cannot solve the problem where the difference between the separation distance at the center position and the separation distance at the peripheral position is large due to the short back focal distance and the wide CRA of smartphones.
  • the OLPF according to the third embodiment separates light in only one direction, resolution adjustment is performed in only one direction. In order to separate the incident light into a plurality of directions, it is necessary to add a plurality of the above OLPFs and this results in that the total thickness of the OLPF becomes thick.
  • FIG. 1 shows a cross-sectional view of a camera module 40 according to a fifth embodiment.
  • the camera module 40 according to the fifth embodiment comprises a variable Optical Low Pass Filter (vOLPF) 10 according to a fourth embodiment.
  • the vOLPF 10 is arranged on the light receiving surface side of an image sensor 30. Accordingly, light which passes through an imaging lens 20 arrives at the light receiving surface of the image sensor 30 through the vOLPF 10.
  • the camera module 40 shown in FIG. 1 may be integrated into a digital camera, a smartphone, a laptop computer, a tablet computer or a wearable device.
  • the imaging lens 20 has at least one lens and may form an image on the light receiving surface of the image sensor 30.
  • the image sensor 30 may be a Charge-Coupled Device (CCD) sensor or a Complementary Metal Oxide Semiconductor (CMOS) sensor, and may have a plurality of pixels. Each pixel of the image sensor 30 may photoelectrically convert light to produce image data.
  • CCD Charge-Coupled Device
  • CMOS Complementary Metal Oxide Semiconductor
  • FIG. 2 shows the vOLPF 10 according to the fourth embodiment.
  • FIG. 2 (a) is a top view seen from the side where incident light enters and
  • FIG. 2 (b) is a cross-sectional view along line A-A of FIG. 2 (a) .
  • the vOLPF 10 comprises: two opposing substrates, i.e., first transparent substrate 110 and second transparent substrate 120; two opposing transparent electrodes, i.e., first transparent electrode 130 and second transparent electrode 140; two opposing liquid crystal alignment layers, i.e., first liquid crystal alignment layer 150 and second liquid crystal alignment layer 160; and a liquid crystal layer 170 which is sandwiched between the first transparent substrate 110 and the second transparent substrate 120 each of which has the transparent electrode and the liquid crystal alignment layer thereon.
  • the first transparent substrate 110 and the second transparent substrate 120 may be provided for supporting the transparent electrode and the liquid crystal alignment layer, and may be transparent in order to transmit incident light.
  • the material of the first transparent substrate 110 and the second transparent substrate 120 is not especially limited, but for example, the first transparent substrate 110 and the second transparent substrate 120 may be a glass substrate.
  • the first transparent substrate 110 and/or the second transparent substrate 120 may have a function for blocking infrared light.
  • the first transparent substrate 110 and/or the second transparent substrate 120 may be an IR cut filter. It is possible to selectively transmit light with a desired wavelength range by adopting the IR cut filter. Selectively transmitted light is, for example, visible light.
  • the vOLPF 10 according to the fourth embodiment does not need a birefringent plate which is used in conventional OLPFs because, as explained below, the liquid crystal layer 170 can tune the birefringence. That is, it is preferable that the first transparent substrate 110 and/or the second transparent substrate 120 be non-birefringent. More preferably, the first transparent substrate 110 and the second transparent substrate 120 are non-birefringent.
  • the vOLPF 10 according to the fourth embodiment can make the thicknesses of the first transparent substrate 110 and the second transparent substrate 120 thin because there is no need to separate the incident light in the first transparent substrate 110 and the second transparent substrate 120.
  • the thicknesses of the first transparent substrate 110 and the second transparent substrate 120 may occupy most of the thickness of the vOLPF 10 in the optical axis direction (z-axis direction in FIG. 2) . Accordingly, reducing the thicknesses of the first transparent substrate 110 and the second transparent substrate 120 can significantly reduce the thickness of the vOLPF in the optical axis direction.
  • the vOLPF 10 according to the fourth embodiment does not need to provide any substrates, for example, birefringent plates, other than the first transparent substrate 110 and the second transparent substrate 120, the thickness of the vOLPF 10 can be thin.
  • the thickness D1 of the vOLPF 10 in the optical axis direction preferably ranges from 200 ⁇ m to 3,000 ⁇ m.
  • the thickness D1 of the vOLPF in the optical axis direction may be from 250 ⁇ m to 1,000 ⁇ m, and may be from 300 ⁇ m to 500 ⁇ m.
  • the substrate can have appropriate strength.
  • the thickness D1 of the vOLPF 10 in the optical axis direction is 3,000 ⁇ m or less, it can be suitably applied to smartphones.
  • the thicknesses D2 of the first transparent substrate 110 and/or the second transparent substrate 120 in the optical axis direction preferably range from 100 ⁇ m to 1,500 ⁇ m.
  • the thicknesses D2 of the first transparent substrate 110 and/or the second transparent substrate 120 in the optical axis direction may be from 150 ⁇ m to 500 ⁇ m, and may be from 200 ⁇ m to 300 ⁇ m.
  • the transparent substrate can have appropriate strength.
  • the thicknesses D2 of the first transparent substrate 110 and/or the second transparent substrate 120 in the optical axis direction are 1,500 ⁇ m or less, the light transmission can be highly maintained.
  • the first transparent electrode 130 and the second transparent electrode 140 change the arrangement of liquid crystal molecules in the liquid crystal layer 170 by applying an electric field in the liquid crystal layer 170.
  • the first transparent electrode 130 and the second transparent electrode 140 may be transparent in order to transmit incident light.
  • the first transparent electrode 130 and the second transparent electrode 140 are made of a transparent conductive material.
  • the first transparent electrode 130 and the second transparent electrode 140 are made of, for example, indium tin oxide (ITO) or indium zinc oxide (IZO) .
  • the center electrode 131 and the one or more concentric electrodes 132 are electrically isolated from each other and separately electrically connected to voltage source (s) through wires (not shown) . Therefore, the magnitude of the electrical signal applied to each electrode can be controlled separately.
  • the electrode pattern of the second transparent electrode 140 may be the same as the electrode pattern of the first transparent electrode 130.
  • the electrical signals applied to the center electrode 131 and the one or more concentric electrodes 132 can be adjusted separately to concentrically control the birefringence of the liquid crystal layer 170.
  • the separation distances of the separation of the incident light at any positions in the field of view can be uniform. That is, since the vOLPF according to the fourth embodiment can adjust the separation distance at the center position and the separation distance at the peripheral position separately, it is suitable for use in smartphones having a short back focal distance and a wide CRA.
  • the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160 are provided for defining the alignment direction of the liquid crystal molecules.
  • the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160 preferably have one or more alignment directions.
  • alignment grooves in the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160 may be formed to have one or more alignment directions.
  • the alignment direction of the liquid crystal alignment layer defines the alignment direction of the liquid crystal molecules in the liquid crystal layer 170. That is, when the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160 have one or more alignment directions, the liquid crystal molecules in the liquid crystal layer 170 can be aligned in predetermined alignment directions accordingly.
  • the material of the liquid crystal alignment layer may be selected in consideration of heat resistance, solvent resistance and hygroscopicity.
  • the liquid crystal alignment layer is made of polyimide.
  • the liquid crystal layer 170 includes liquid crystal molecules which may tune the birefringence according to the strength of the electric field applied by the first transparent electrode 130 and the second transparent electrode 140.
  • the liquid crystal layer 170 preferably comprises nematic liquid crystals. When the liquid crystal layer 170 comprises nematic liquid crystals, it becomes easy to control the birefringence.
  • the thickness D3 of the liquid crystal layer 170 in the optical axis direction preferably ranges from 5 ⁇ m to 150 ⁇ m.
  • the thickness D3 of the liquid crystal layer 170 in the optical axis direction for example, may be from 10 ⁇ m to 100 ⁇ m, and may be from 20 ⁇ m to 50 ⁇ m.
  • the liquid crystal layer 170 in the optical axis direction When the thickness D3 of the liquid crystal layer 170 in the optical axis direction is 5 ⁇ m or more, the liquid crystal layer 170 can sufficiently separate the incident light. When the thickness D3 of the liquid crystal layer 170 in the optical axis direction is 150 ⁇ m or less, it becomes easy to control the alignment direction of the liquid crystal molecules of the liquid crystal layer 170.
  • FIG. 4 shows an exemplary pattern of the alignment grooves formed in the first liquid crystal alignment layer 150.
  • the alignment grooves 151 of the first liquid crystal alignment layer 150 preferably extend radially from the center of the vOLPF.
  • the alignment grooves in a center region 152 located near the center of the vOLPF may be formed in the longitudinal direction (y-axis direction in FIG. 4) .
  • the alignment grooves in the center region 152 are formed in the longitudinal direction, it is possible to control the alignment of the liquid crystal molecules in the center region 152.
  • the direction of the alignment grooves in the center region 152 is not limited to the longitudinal direction and may be the transverse direction (x-axis direction) or an oblique direction (direction with a predetermined angle from the x-axis) .
  • the pattern of the alignment grooves in the second liquid crystal alignment layer 160 preferably is the same as the pattern of the alignment grooves in the first liquid crystal alignment layer 150.
  • the pattern of the alignment grooves in the first liquid crystal alignment layer 150 is the same as the pattern of the alignment grooves in the second liquid crystal alignment layer 160, it becomes easy to control the alignment direction of the liquid crystal molecules in the liquid crystal layer 170.
  • the patterns of the alignment grooves in the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160 may be formed so that the alignment direction of the liquid crystal molecules adjacent to the first liquid crystal alignment layer 150 is parallel to the alignment direction of the liquid crystal molecules adjacent to the second liquid crystal alignment layer 160. Accordingly, the pattern of the alignment grooves in the first liquid crystal alignment layer 150 preferably is the same as the pattern of the alignment grooves in the second liquid crystal alignment layer 160.
  • the pattern of the alignment grooves shown in FIG. 4 is merely an example, and various patterns may be provided as needed.
  • FIG. 5 shows an exemplary alignment state of the liquid crystal molecules in the liquid crystal layer 170, for the case of using the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160, which have the alignment groove pattern shown in FIG. 4.
  • the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160 preferably have an alignment direction extending radially from the center of the vOLPF.
  • the alignment grooves of the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160 are formed to extend radially from the center of the vOLPF, the liquid crystal molecules in the liquid crystal layer 170 may also be aligned radially from the center of the vOLPF.
  • the liquid crystal molecules may be aligned parallel to the y-axis direction.
  • the liquid crystal molecules may be aligned parallel to the x-axis direction.
  • the liquid crystal molecules may be aligned at an angle about 45° from the x-axis direction.
  • FIG. 6 shows a state in which the incident light is subject to the birefringent effect and thereby separated into two light beams, for the case of using the first liquid crystal alignment layer 150 and the second liquid crystal alignment layer 160, which have the alignment groove pattern shown in FIG. 4.
  • the incident light is also separated radially from the center of the vOLPF.
  • the incident light may be separated along the y-axis direction.
  • the incident light may be separated along the x-axis direction.
  • the incident light may be separated along a direction at an angle about 45° from the x-axis direction.
  • the alignment grooves in the liquid crystal alignment layer may have a plurality of directions and thereby one liquid crystal layer can separate light in a plurality of directions.
  • FIG. 7 shows an imaging system 200 according to a sixth embodiment comprising the vOLPF 10.
  • the imaging system 200 according to the sixth embodiment may be integrated into a digital camera, a smartphone, a laptop computer, a tablet computer or a wearable device.
  • the imaging system 200 according to the sixth embodiment is particularly suitable for being integrated into smartphones. That is, a smartphone according to a seventh embodiment comprises the imaging system 200 according to the sixth embodiment.
  • the imaging system 200 comprises the camera module 40 according to the fifth embodiment.
  • the camera module 40 comprises: the vOLPF 10 according to the fourth embodiment, the imaging lens 20, and the image sensor 30.
  • the imaging lens 20 may collect light from the subject and form an image of the subject on the light receiving surface of the image sensor 30.
  • the CRA thereof may be from 0 degrees (on-axis) to 18 degrees (1.0 field image height of some DSLR lens) .
  • the CRA thereof may be from 0 degrees (on-axis) to 38 degrees (1.0 field image height of some smartphone lens) .
  • Each pixel of the image sensor 30 may photoelectrically convert light to produce raw image data.
  • the image sensor 30 outputs the image data with a single-pixel mode in which each pixel of the image sensor 30 is used as it is, or with the 2x2 binning mode, the 3x3 binning mode, the 4x4 binning mode or other binning mode in which the several adjacent pixels of the image sensor 30 are combined.
  • the imaging system 200 comprises: an Optical Low Pass Filter (OLPF) driver 50 connected to the vOLPF 10; an image signal processor 60 connected to the image sensor 30; a display 70; and a controller unit 80.
  • the controller unit 80 is connected to the OLPF driver 50, the image sensor 30, the image signal processor 60, and the display 70.
  • OLPF Optical Low Pass Filter
  • the OLPF driver 50 transmits an electrical signal to the first transparent electrode 130 and the second transparent electrode 140 to control the birefringence of the liquid crystal layer 170.
  • the first transparent electrode 130 and/or the second transparent electrode 140 comprise the center electrode 131 and the one or more concentric electrodes 132 as shown FIG. 3
  • electrical signals with different voltages or different frequencies may be transmitted to the center electrode 131 and the one or more concentric electrodes 132.
  • electrical signals with different voltages or different frequencies are transmitted to the center electrode 131 and the one or more concentric electrodes 132 to make the birefringent effect relatively large near the center of the vOLPF and gradually decrease the birefringent effect toward the outside of the vOLPF.
  • the separation distances of the separation of the incident light at any positions in the field of view can be uniform. That is, the separation distances of the separation of the incident light at the center position and the peripheral position of the image sensor 30 can be appropriately tuned.
  • the voltage of the electrical signal ranges from 0 to 10 V.
  • the frequency of the electrical signal ranges from 0 to 10 kHZ.
  • the display 70 may be composed of, for example, a liquid crystal panel, and may function as a display unit for displaying a live view image based on the image file obtained from the controller unit 80.
  • the display 70 may also display the setting menu of an apparatus and the operation status of a user.
  • the controller unit 80 may control the OLPF driver 50, the image sensor 30, the image signal processor 60, and the display 70.
  • the controller unit 80 may control the OLPF driver 50 to switch between enabling or disabling of the birefringent function of the vOLPF 10.
  • the controller unit 80 may control the OLPF driver 50 to output different electrical signals to the center electrode 131 and the one or more concentric electrodes 132.
  • the controller unit 80 may control the image sensor 30 to determine whether to acquire the raw image data with either the single-pixel mode or any of the 2x2 binning mode, the 3x3 binning mode, the 4x4 binning mode, and other binning modes.
  • An eighth embodiment includes a method for controlling the above-mentioned imaging system 200.
  • the method for controlling the imaging system 200 comprises: transmitting the electrical signal from the OLPF driver 50 to the two opposing transparent electrodes, i.e., the first transparent electrode 130 and the second transparent electrode 140 of the vOLPF 10, thereby controlling the birefringence of the liquid crystal layer 170.
  • the imaging system 200 preferably comprises an automatic mode or a manual mode for the use of the vOLPF 10 and a user may select the automatic mode and the manual mode.
  • the controller unit 80 obtains an image file according to each mode of the image sensor 30 and automatically estimates the occurrence of moiré from the obtained image file.
  • the controller unit 80 then considers the trade-off relationship between the resolution and moiré suppression, and may control the OLPF driver 50 to perform moiré suppression as much as possible without reducing the resolution as much as possible.
  • the user can manually switch between using the vOLPF or not.
  • a moiré possibly appears when the subject with a periodic pattern is photographed. In other words, when there is no periodic pattern in the subject, moiré rarely occurs.
  • the trade-off relationship between the resolution and moiré suppression and thus the use of the OLPF results in a reduction of the resolution. Accordingly, for example, when the user confirms that there are no periodic patterns in the subject or the user wishes to obtain a high-resolution image without being concerned with slight moiré, the user may manually disable the birefringent function of the vOLPF 10. Specifically, the user selects an item for not using the vOLPF through the user interface of the display and the controller unit 80 which received that instruction controls the OLPF driver 50 to disable the birefringent function of the vOLPF 10.
  • the user may manually enable the birefringent function of the vOLPF 10. Specifically, the user selects an item for using the vOLPF through the user interface of the display and the controller unit 80 which received that instruction controls the OLPF driver 50 to enable the birefringent function of the vOLPF 10.
  • the method according to the eighth embodiment can easily control the birefringent function because only the liquid crystal layer comprises the birefringent function and thus there is no need to consider the mutual relationship with any birefringent plate.
  • OLPF Optical Low Pass Filter

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Abstract

L'invention concerne un filtre passe-bas optique variable (vOLPF) (10) ayant une épaisseur réduite. Le vOLPF (10) comprend : deux substrats transparents opposés (110, 120) ; deux électrodes transparentes opposées (130, 140) ; deux couches d'alignement de cristaux liquides opposées (150, 160) ; et une couche de cristaux liquides (170) qui est prise en sandwich entre les deux substrats transparents opposés (110, 120) ayant chacun l'électrode transparente (130, 140) et la couche d'alignement de cristaux liquides (150, 160) sur ceux-ci, et la biréfringence de la couche de cristaux liquides (170) pouvant être accordable.
PCT/CN2021/073304 2021-01-22 2021-01-22 Filtre passe-bas optique variable, module de caméra le comprenant, système d'imagerie comprenant le module de caméra, téléphone intelligent comprenant le système d'imagerie, et procédé de commande du système d'imagerie WO2022155891A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202180090764.2A CN116888524A (zh) 2021-01-22 2021-01-22 可变光学低通滤波器、包括所述可变光学低通滤波器的摄像头模组、包括所述摄像头模组的成像系统、包括所述成像系统的智能手机和用于控制所述成像系统的方法
PCT/CN2021/073304 WO2022155891A1 (fr) 2021-01-22 2021-01-22 Filtre passe-bas optique variable, module de caméra le comprenant, système d'imagerie comprenant le module de caméra, téléphone intelligent comprenant le système d'imagerie, et procédé de commande du système d'imagerie

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PCT/CN2021/073304 WO2022155891A1 (fr) 2021-01-22 2021-01-22 Filtre passe-bas optique variable, module de caméra le comprenant, système d'imagerie comprenant le module de caméra, téléphone intelligent comprenant le système d'imagerie, et procédé de commande du système d'imagerie

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