EP2956322A1 - Shading device, vehicle and glass shading method - Google Patents

Shading device, vehicle and glass shading method

Info

Publication number
EP2956322A1
EP2956322A1 EP14751132.3A EP14751132A EP2956322A1 EP 2956322 A1 EP2956322 A1 EP 2956322A1 EP 14751132 A EP14751132 A EP 14751132A EP 2956322 A1 EP2956322 A1 EP 2956322A1
Authority
EP
European Patent Office
Prior art keywords
pdlc film
shading
film
glass
pdlc
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP14751132.3A
Other languages
German (de)
French (fr)
Other versions
EP2956322A4 (en
Inventor
Stephan VOISIN
Changle Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saint Gobain Glass France SAS
Original Assignee
Saint Gobain Glass France SAS
Compagnie de Saint Gobain SA
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 Saint Gobain Glass France SAS, Compagnie de Saint Gobain SA filed Critical Saint Gobain Glass France SAS
Publication of EP2956322A1 publication Critical patent/EP2956322A1/en
Publication of EP2956322A4 publication Critical patent/EP2956322A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
    • B60J3/04—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles adjustable in transparency

Definitions

  • the present disclosure generally relates to glass manufacturing and fabricating, and more particularly, to a shading device, a vehicle and a glass shading method.
  • a sun shield is mounted on an upper region of a vehicle's front window.
  • the sun shield can be flipped down when shading is needed, and flipped up when shading is not needed.
  • the sunlight can't irradiate the driver's eyes directly, and so the vision field in driving may be improved to a certain extent.
  • the sun shield occupies some inner space of the vehicle and is not aesthetic.
  • the driver needs to manually adjust the position of the sun shield according to different light conditions at any moment, which is detrimental to driving safety.
  • a plastic interlayer film such as a PVB film
  • Embodiments in the present disclosure provide a shading device, a vehicle and a glass shading method for simply and effectively adjusting glass transmittance.
  • a shading device including: a glass; a polymer dispersed liquid crystal (PDLC) film disposed on a portion of the glass, where the portion of the glass is corresponding to a desired shading position; a power source coupled to the PDLC film; and a regulator coupled to the power source, adapted for regulating a voltage supplied to the PDLC film by the power source.
  • PDLC polymer dispersed liquid crystal
  • the shading device further includes: a sensor, disposed on the glass and adapted for obtaining a current light intensity information; and a controller, coupled to the regulator and the sensor, and adapted for controlling, according to the current light intensity information, the regulator to regulate the voltage.
  • a vehicle is provided.
  • the vehicle includes the shading device described above.
  • a glass shading method including: disposing a PDLC film on a glass corresponding to a desired shading position; obtaining a current light intensity information; and supplying, to the PDLC film, a voltage corresponding to the current light intensity information.
  • a PDLC film is disposed on a glass corresponding to a desired shading position.
  • the transmittance of the glass corresponding to the desired shading position is controllable by adjusting a voltage supplied to the PDLC film.
  • a relatively low voltage may be supplied to the PDLC film, such that the glass at the corresponding position has a lower transmittance value.
  • a relatively high voltage may be supplied to the PDLC film, such that the glass at the corresponding position has a higher transmittance value.
  • the transmittance of the glass can be adjusted in a simple and effective way, and user comfort may be improved.
  • current light intensity information can be obtained using a sensor, and a controller is employed to control, according to the current light intensity information, a regulator to regulate the voltage supplied to the PDLC film, such that the voltage supplied to the PDLC film can be automatically adjusted. There is no need for the user to manually adjust, thereby improving driving safety.
  • liquid crystals in the PDLC film may be doped with dichroic dye. Therefore, when the voltage supplied to the PDLC film by the power source equals 0, the PDLC film at the corresponding desired position may present a color corresponding to the dichroic dye. In this way, not only aesthetic may be improved, but also the user can have more options for colors. Thus, user experience may be improved.
  • FIG. 1 schematically illustrates a structural diagram of a shading device according to an embodiment of the present disclosure
  • FIG. 2 schematically illustrates a first structure of a PDLC film disposed on a windshield according to an embodiment of the present disclosure
  • FIG. 3 schematically illustrates a second structure of a PDLC film disposed on a windshield according to an embodiment of the present disclosure
  • FIG. 4 schematically illustrates a third structure of a PDLC film disposed on a windshield according to an embodiment of the present disclosure
  • FIG. 5 schematically illustrates a structural diagram of a shading device according to an embodiment of the present disclosure
  • FIG. 6 schematically illustrates a structural diagram of the controller in FIG. [0025]
  • FIG. 7 schematically illustrates a flow chart of a glass shading method according to an embodiment of the present disclosure.
  • a user can use a sun shield or a colored glass to shield light.
  • the conventional solutions described have drawbacks in aesthetics or practicability. Transmittance of glass can't be adjusted in a simple and effective way.
  • a polymer dispersed liquid crystal (PDLC) film is disposed on a glass corresponding to a desired shading position, i.e., a position at which shading may be required in practice. Thereafter, a piece of current light intensity information is obtained and a voltage corresponding to the current light intensity information is supplied to the PDLC film.
  • the transmittance of the glass at the corresponding position can be controlled by adjusting the voltage supplied to the PDLC film.
  • the above shading device is both aesthetic and practical, and glass transmittance can be adjusted simply and effectively, which thus improves user experience.
  • the shading device may include: a glass 100; a PDLC film 200 disposed on a portion of the glass 100, where the portion is corresponding to a desired shading position; a power source 300 coupled to the PDLC film 200; and a regulator 400 coupled to the power source 300, adapted for regulating a voltage supplied to the PDLC film 200 by the power source 300.
  • the PDLC film 200 may be made by mixing prepolymers, nematic liquid crystals and spacer materials in a particular proportion, and then be disposed between two soft transparent conductive films.
  • the working principle includes: when no electric field is applied, liquid crystal droplets may distribute randomly in the polymer material with their directors orientated freely. In such case, the refractive index of the liquid crystals to ordinary lights mismatches with that of the polymer material, leading to a relatively strong scattering effect on the lights, which results in a translucent or opaque "milky white" appearance of the PDLC film. Under an electric field, the liquid crystal droplets may have their directors arranged along a direction of the outer electric field due to positive dielectric anisotropic characteristic thereof.
  • the refractive index of the liquid crystals to ordinary lights matches with that of the polymer materials, light can pass through the PDLC film and thus the PDLC film will have a transparent appearance. Specifically, the greater the voltage supplied to the PDLC film is, the more transparent the PDLC film becomes.
  • dichroic dye may be added into the liquid crystals of the PDLC film.
  • Dichroic dye has different light absorption rates along different axes, and thus may present different colors. Orientation of dichroic dye molecules in liquid crystal may depend on main liquid crystals, which is well known in the art and so is not illustrated in detail here.
  • the voltage supplied to the PDLC film by the power source equals 0, the PDLC film at the corresponding position presents a color corresponding to the dichroic dye, which improves aesthetic and offers more options to the user as well.
  • the user can customize the glass in several ways, which thus improves user experience.
  • the present disclosure fully applies working principles of the PDLC film 200 described above.
  • the regulator 400 regulates the power source 300 to provide a relatively low voltage to the PDLC film 200, such that the glass 100 corresponding to the PDLC film 200 turns translucent or opaque, i.e., the glass 100 has a relatively low transmittance value.
  • the regulator 400 regulates the power source 300 to provide a relatively high voltage to the PDLC film 200, such that the glass 100 corresponding to the PDLC film 200 turns transparent, i.e., the glass 100 has a relatively high transmittance value. In such a way, the transmittance of the glass 100 can be simply and effectively adjusted, and user experience may be improved.
  • the shading also may be used in other kinds of glass, such as architectural glass, and the like, which doesn't limit the scope of the present disclosure.
  • the shading device When the shading device is used in a vehicle, not only inner space of the vehicle may be saved, but also aesthetic may be improved.
  • glass mounted on the vehicle When light out of the vehicle is relatively strong, glass mounted on the vehicle may be turned to have a color, or be translucent or opaque, so as to shield the outer light. When the outer light is relatively weak, the glass may be turned to be transparent, so as to increase light intensity inside of the vehicle. Therefore, the shading device is practical.
  • the PDLC film may be disposed on a windshield, especially on an upper portion of the front windshield of the vehicle, i.e., at the position where a sun shield may be disposed in conventional techniques.
  • the shape and size of the PDLC film may be determined based on practical requirements. If there is a need to reduce the transmittance of the windshield, the regulator may regulate the power source to reduce the voltage provided to the PDLC film. If there is a need to increase the transmittance of the windshield, the regulator may regulate the power source to increase the voltage provided to the PDLC film.
  • liquid crystals in the PDLC film may include dichroic dye.
  • the windshield at the position corresponding to the PDLC film presents a color corresponding to the dichroic dye.
  • the PDLC film at the corresponding desired position presents a transparent state.
  • the liquid crystals in the PDLC film do not include dichroic dye.
  • the windshield at the position corresponding to the PDLC film presents a translucent or opaque state.
  • the PDLC film at the corresponding desired position presents a transparent state.
  • the windshield may successively include a first glass substrate 703, a polyvinyl butyral (PVB) film 702 and a second glass substrate 701 disposed as a stack, where the PDLC film 200 is attached to an outer surface of the first glass substrate 703.
  • PVB polyvinyl butyral
  • the windshield may successively include a first glass substrate 804, a first PVB film 803, a second PVB film 802 and a second glass substrate 801 disposed as a stack, where the PDLC film 200 is disposed between the first PVB film 803 and the second PVB film 802.
  • the windshield may successively include a first glass substrate 901, a polyvinyl butyral (PVB) film 902 and a second glass substrate 903 disposed as a stack, where the PDLC film 200 is attached to an outer surface of the second glass substrate 903. Furthermore, an outer surface of the PDLC film 200 may be provided with a protective layer 900.
  • the protective layer 900 may be a water proof film for protecting the PDLC film 200 from rain or vehicle washing water.
  • the PDLC film 200 may have a thickness ranging from 0.3 mm to about 2 mm, for example, the thickness may be 0.3 mm, 0.7 mm, 1.0 mm, 1.5 mm or 2.0 mm.
  • the vehicle may include a power supply for providing direct current
  • the power source may be an alternating current power source adapted for providing alternating current for the PDLC film. Therefore, in some embodiments, the shading device may further include a dc-ac converter (not shown in FIG. 1) coupled to the power source and the power supply, which is used to convert the direct current provided by the power supply into an alternating current.
  • the driving voltage i.e., a working voltage provided by the power source, that the PDLC film needs to maintain a transparent appearance is mainly relative to dielectric index of the polymer and liquid crystals in the PDLC film, which is well known in the art and is not illustrated in detail here.
  • the power source may provide an alternating current with a working voltage ranging from about 20 V to about 50 V, for example, the working voltage may be 20 V, 30 V, 40 V, 50 V, or the like.
  • the power supply of the vehicle generally provides a working voltage of 12 V.
  • the shading device may further include a transformer adapted to change the voltage.
  • the regulator may be manually controlled or controlled by means of voice control by the user to simply and effectively adjust the inner light intensity of the vehicle.
  • the shading device may further include: a sensor 510 disposed on the glass 100, adapted for obtaining current light intensity information; and a controller 530 coupled to the sensor 510 and the regulator 400, adapted for controlling the regulator 400 to regulate the voltage according to the current light intensity information.
  • the senor 510 may be a light intensity sensor, which may be disposed on an inner surface, on an outer surface or inside of the glass 100, such that the sensor 510 can obtain the light intensity information corresponding to where it locates.
  • the controller 530 may be a single chip computer, a digital signal processor, or the like.
  • the controller 530 may include: an extraction unit 531, coupled to the sensor 510 and adapted for obtaining the light intensity information; a storage unit 532, adapted for storing corresponding relationships between different light intensity information and voltage values; an invoking unit 533, coupled to the extraction unit 531 and the storage unit 532, and adapted for invoking a target voltage value corresponding to the light intensity information; an acquiring unit 534, coupled to the regulator 400 and adapted for obtaining current status information of the regulator 400 to obtain a current voltage value currently applied to the PDLC film; a comparator 535, coupled to the invoking unit 533 and the acquiring unit 534, and adapted for calculating a difference value between the target voltage value and the current voltage value; and an adjusting unit 536, coupled to the regulator 400 and the comparator 535, and adapted for controlling the regulator 400 to regulate according to the difference value.
  • controller 530 may work as follows:
  • the extraction unit 531 extracts the current light intensity information from the sensor 510 and sends the current light intensity information to the invoking unit 533.
  • the invoking unit 533 invokes from the storage unit 532 a voltage value, i.e., the target voltage value, corresponding to the current light intensity information, and sends the target voltage value to the comparator 535. If the regulator 400 can regulate the power source 300 to provide a voltage having the target voltage value to the PDLC film 200, the transmittance rate of the glass at the corresponding position may meet the user's requirement.
  • the acquiring unit 534 obtains the current status information of the regulator 400, and thus obtains the value of the voltage currently supplied to the PDLC film 200 by the power source 300, and sends the obtained voltage value, i.e., the current voltage value, to the comparator 535.
  • the comparator 535 obtains the target voltage value and the current voltage value, and calculates the difference value between them. If the glass transmittance rate at the corresponding position needs to be reduced, the PDLC film needs to be adjusted from a transparent state to an opaque state, so that the target voltage value should be lower than the current voltage value. If the glass transmittance rate at the corresponding position needs to be increased, the PDLC film needs to be adjusted from an opaque state to a transparent state, so that the target voltage value should be higher than the current voltage value.
  • the adjusting unit 536 obtains the difference value from the comparator 535 and controls the regulator 400 to regulate the power source 300, such that the power source 300 may provide a voltage with the target voltage value to the PDLC film 200.
  • the regulator 400 needs to make the power source 300 reduce the voltage supplied to the PDLC film 200.
  • the regulator 400 needs to make the power source 300 increase the voltage supplied to the PDLC film 200.
  • the controller 530 controls the regulator 400 to regulate the power source 300 to provide a suitable voltage to the PDLC film 200, thereby obtaining a desired transmittance rate at the corresponding position.
  • the corresponding relationships between the different light intensity information and the voltages may be pre-set and can also be changed at any time.
  • the shading device may further include: an audio player 550 coupled to the controller 530.
  • the audio player 550 may broadcast the light intensity information and regulation information to the user in time.
  • the shading device as illustrated in FIG. 5 may work as follows:
  • the sensor 510 obtains current light intensity information
  • the controller 530 obtains the current voltage value through the regulator 400 and the target voltage value according to the current light intensity information;
  • the controller 530 controls the regulator 400 to regulate the power source 300 according to a difference value between the target voltage value and the current voltage value, and controls the audio player 550 to broadcast corresponding audio information.
  • the sensor 510 is used to obtain the current light intensity information, and the controller 530 is employed to control the regulator 400 to automatically regulate the voltage supplied to the PDLC film 200, such that the user doesn't need to manually adjust the device and driving safety may be improved.
  • the PDLC films may be disposed on different pieces of glass or at different positions of the same glass of the vehicle.
  • Each PDLC film may have a corresponding regulator, a power source and a sensor.
  • a plurality of PDLC films may share a same controller and audio player. In such a way, according to various requirements, different transmittance rates for different pieces of glass or different positions of a same glass can be achieved.
  • FIG. 7 a shading method is provided according to one embodiment. The method may include:
  • Step SI disposing a PDLC film on a glass corresponding to a desired shading position
  • Step S2 obtaining a current light intensity information
  • Step S3 supplying, to the PDLC film, a voltage corresponding to the current light intensity information.
  • the PDLC film may have a thickness ranging from about 0.3 mm to about 2 mm.
  • liquid crystals in the PDLC film may be doped with dichroic dye.
  • the PDLC film at the desired shading position presents a color corresponding to the dichroic dye.
  • the PDLC film at the desired position presents a transparent state.
  • the liquid crystals in the PDLC film may not include dichroic dye.
  • the PDLC film at the desired shading position presents a translucent or opaque state.
  • the PDLC film at the desired shading position presents a transparent state.
  • the PDLC film may be disposed on a surface of the glass or inside of the glass.
  • the glass may be a windshield of a vehicle.
  • the transmittance of the glass can be simply and effectively adjusted, and user comfort may be improved.
  • the present disclosure has been disclosed as above with reference to preferred embodiments thereof but will not be limited thereto. Those skilled in the art can modify and vary the embodiments without departing from the spirit and scope of the present disclosure. Accordingly, without departing from the scope of the present invented technology scheme, whatever simple modification and equivalent variation belong to the protection range of the present invented technology scheme.

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  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Physics & Mathematics (AREA)
  • Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Surface Treatment Of Glass (AREA)
  • Dispersion Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)

Abstract

A shading device, a vehicle and a shading method are provided. The shading device includes a glass (701,703), a PDLC film (200) disposed on a portion of the glass (701,703) corresponding to a desired shading position, a power source (300) coupled to the PDLC film (200), and a regulator (400) coupled to the power source (300), adapted for regulating to voltage supplied to the PDLC film (200) by the power source (300). The vehicle includes the shading device. The shading method includes: disposing the PDLC film (200) on a glass (701,703) corresponding to a desired shading position; obtaining a current light intensity information; and supplying to the PDLC (200) film a voltage corresponding to the current light intensity information. Glass transmittance may be adjusted in a simple and effective way.

Description

SHADING DEVICE, VEHICLE AND GLASS SHADING METHOD
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to Chinese patent application No. 201310052008.8, filed on February 17, 2013, and entitled "SHADING DEVICE, VEHICLE AND GLASS SHADING METHOD", the entire disclosure of which is incorporated herein by reference.
FIELD OF THE DISCLOSURE
[0002] The present disclosure generally relates to glass manufacturing and fabricating, and more particularly, to a shading device, a vehicle and a glass shading method.
BACKGROUND OF THE DISCLOSURE
[0003] When driving a vehicle, one may meet outer light intensities changing tremendously. For example, in a sunny midday, light may be too strong. However, light in a tunnel, in a rainy day or a dark night may be too weak. Furthermore, when a driver is driving towards the sunlight, which often happens, the sunlight would go through the vehicle window and directly irradiate the driver's eyes. When there is a high contrast between strong light and weak light in a human's eyesight, it may be difficult for human eyes to recognize information contained in the weak light. The driver may be dazzled and thus can't see surroundings clearly, which may lead to traffic accidents. Therefore, shading devices are required in vehicles.
[0004] Conventional techniques employ two solutions to shield light.
[0005] In a first solution, a sun shield is mounted on an upper region of a vehicle's front window. The sun shield can be flipped down when shading is needed, and flipped up when shading is not needed. As such, the sunlight can't irradiate the driver's eyes directly, and so the vision field in driving may be improved to a certain extent. However, the sun shield occupies some inner space of the vehicle and is not aesthetic. Besides, the driver needs to manually adjust the position of the sun shield according to different light conditions at any moment, which is detrimental to driving safety. [0006] In a second solution, a plastic interlayer film (such as a PVB film) sandwiched in an upper part of a front laminated windshield is colored to turn the corresponding part of the windshield to opaque. In this way, sunlight directly irradiating the driver's eyes can be avoided, thus shielding is achieved. However, since the colored plastic interlayer film is fixed there, the corresponding part of the windshield is opaque even when the light is weak and doesn't need to be shielded. As a result, the outer light can't pass through the windshield effectively to increase the light intensity inside the vehicle. In other words, this solution is not flexible, and so is not practical.
[0007] Similarly, shading is also needed for usages of other kinds of glass (for example, architectural glass), which means the above drawbacks also exist.
[0008] Therefore, solutions for simply and effectively adjusting glass transmittance are urgently required.
SUMMARY
[0009] Embodiments in the present disclosure provide a shading device, a vehicle and a glass shading method for simply and effectively adjusting glass transmittance.
[0010] According to one embodiment, a shading device is provided, including: a glass; a polymer dispersed liquid crystal (PDLC) film disposed on a portion of the glass, where the portion of the glass is corresponding to a desired shading position; a power source coupled to the PDLC film; and a regulator coupled to the power source, adapted for regulating a voltage supplied to the PDLC film by the power source.
[0011] Optionally, the shading device further includes: a sensor, disposed on the glass and adapted for obtaining a current light intensity information; and a controller, coupled to the regulator and the sensor, and adapted for controlling, according to the current light intensity information, the regulator to regulate the voltage.
[0012] According to one embodiment, a vehicle is provided. The vehicle includes the shading device described above.
[0013] According to one embodiment, a glass shading method is provided, including: disposing a PDLC film on a glass corresponding to a desired shading position; obtaining a current light intensity information; and supplying, to the PDLC film, a voltage corresponding to the current light intensity information.
[0014] Compared with conventional techniques, embodiments of the present disclosure have following advantages.
[0015] 1) A PDLC film is disposed on a glass corresponding to a desired shading position. The transmittance of the glass corresponding to the desired shading position is controllable by adjusting a voltage supplied to the PDLC film. When shading is needed, a relatively low voltage may be supplied to the PDLC film, such that the glass at the corresponding position has a lower transmittance value. When shading is not needed, a relatively high voltage may be supplied to the PDLC film, such that the glass at the corresponding position has a higher transmittance value. As such, the transmittance of the glass can be adjusted in a simple and effective way, and user comfort may be improved.
[0016] 2) If the above shading device is applied in a vehicle, vehicular inner space can be saved and aesthetic may be improved. When outer light is relatively strong, the glass at the corresponding position can be turned to be translucent or opaque to shield the light. When the outer light is relatively weak, the glass at the corresponding position can be turned to be transparent to increase the light intensity inside of the vehicle. The shading solution is highly practical.
[0017] 3) In some embodiments, current light intensity information can be obtained using a sensor, and a controller is employed to control, according to the current light intensity information, a regulator to regulate the voltage supplied to the PDLC film, such that the voltage supplied to the PDLC film can be automatically adjusted. There is no need for the user to manually adjust, thereby improving driving safety.
[0018] 4) In some embodiments, liquid crystals in the PDLC film may be doped with dichroic dye. Therefore, when the voltage supplied to the PDLC film by the power source equals 0, the PDLC film at the corresponding desired position may present a color corresponding to the dichroic dye. In this way, not only aesthetic may be improved, but also the user can have more options for colors. Thus, user experience may be improved.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 schematically illustrates a structural diagram of a shading device according to an embodiment of the present disclosure;
[0020] FIG. 2 schematically illustrates a first structure of a PDLC film disposed on a windshield according to an embodiment of the present disclosure;
[0021] FIG. 3 schematically illustrates a second structure of a PDLC film disposed on a windshield according to an embodiment of the present disclosure;
[0022] FIG. 4 schematically illustrates a third structure of a PDLC film disposed on a windshield according to an embodiment of the present disclosure;
[0023] FIG. 5 schematically illustrates a structural diagram of a shading device according to an embodiment of the present disclosure;
[0024] FIG. 6 schematically illustrates a structural diagram of the controller in FIG. [0025] FIG. 7 schematically illustrates a flow chart of a glass shading method according to an embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE DISCLOSURE
[0026] In order to clarify the objects, characteristics and advantages of the disclosure, embodiments of the disclosure will be interpreted in detail in combination with accompanied drawings.
[0027] Many details are disclosed in following description to provide better understanding for the present disclosure. However, the present disclosure may be implemented in other different embodiments. Therefore, the following detailed description does not limit the disclosure.
[0028] As described in background of the disclosure, a user can use a sun shield or a colored glass to shield light. However, the conventional solutions described have drawbacks in aesthetics or practicability. Transmittance of glass can't be adjusted in a simple and effective way.
[0029] Accordingly, in embodiments of the present disclosure, a polymer dispersed liquid crystal (PDLC) film is disposed on a glass corresponding to a desired shading position, i.e., a position at which shading may be required in practice. Thereafter, a piece of current light intensity information is obtained and a voltage corresponding to the current light intensity information is supplied to the PDLC film. As such, the transmittance of the glass at the corresponding position can be controlled by adjusting the voltage supplied to the PDLC film. The above shading device is both aesthetic and practical, and glass transmittance can be adjusted simply and effectively, which thus improves user experience.
[0030] Hereinafter, embodiments will be illustrated with reference to accompanying drawings. [0031] Referring to FIG. 1, a shading device is provided according to one embodiment. The shading device may include: a glass 100; a PDLC film 200 disposed on a portion of the glass 100, where the portion is corresponding to a desired shading position; a power source 300 coupled to the PDLC film 200; and a regulator 400 coupled to the power source 300, adapted for regulating a voltage supplied to the PDLC film 200 by the power source 300.
[0032] The PDLC film 200 may be made by mixing prepolymers, nematic liquid crystals and spacer materials in a particular proportion, and then be disposed between two soft transparent conductive films. The working principle includes: when no electric field is applied, liquid crystal droplets may distribute randomly in the polymer material with their directors orientated freely. In such case, the refractive index of the liquid crystals to ordinary lights mismatches with that of the polymer material, leading to a relatively strong scattering effect on the lights, which results in a translucent or opaque "milky white" appearance of the PDLC film. Under an electric field, the liquid crystal droplets may have their directors arranged along a direction of the outer electric field due to positive dielectric anisotropic characteristic thereof. If the refractive index of the liquid crystals to ordinary lights matches with that of the polymer materials, light can pass through the PDLC film and thus the PDLC film will have a transparent appearance. Specifically, the greater the voltage supplied to the PDLC film is, the more transparent the PDLC film becomes.
[0033] In some embodiments, dichroic dye may be added into the liquid crystals of the PDLC film. Dichroic dye has different light absorption rates along different axes, and thus may present different colors. Orientation of dichroic dye molecules in liquid crystal may depend on main liquid crystals, which is well known in the art and so is not illustrated in detail here. When the voltage supplied to the PDLC film by the power source equals 0, the PDLC film at the corresponding position presents a color corresponding to the dichroic dye, which improves aesthetic and offers more options to the user as well. The user can customize the glass in several ways, which thus improves user experience.
[0034] The present disclosure fully applies working principles of the PDLC film 200 described above. When shading is needed, the regulator 400 regulates the power source 300 to provide a relatively low voltage to the PDLC film 200, such that the glass 100 corresponding to the PDLC film 200 turns translucent or opaque, i.e., the glass 100 has a relatively low transmittance value. When shading is not needed, the regulator 400 regulates the power source 300 to provide a relatively high voltage to the PDLC film 200, such that the glass 100 corresponding to the PDLC film 200 turns transparent, i.e., the glass 100 has a relatively high transmittance value. In such a way, the transmittance of the glass 100 can be simply and effectively adjusted, and user experience may be improved.
[0035] For illustration convenience, embodiments of applying the above described shading device in a vehicle will be illustrated hereinafter. It should be noted that, the shading also may be used in other kinds of glass, such as architectural glass, and the like, which doesn't limit the scope of the present disclosure. When the shading device is used in a vehicle, not only inner space of the vehicle may be saved, but also aesthetic may be improved. When light out of the vehicle is relatively strong, glass mounted on the vehicle may be turned to have a color, or be translucent or opaque, so as to shield the outer light. When the outer light is relatively weak, the glass may be turned to be transparent, so as to increase light intensity inside of the vehicle. Therefore, the shading device is practical.
[0036] In the vehicle, in some embodiments, the PDLC film may be disposed on a windshield, especially on an upper portion of the front windshield of the vehicle, i.e., at the position where a sun shield may be disposed in conventional techniques. The shape and size of the PDLC film may be determined based on practical requirements. If there is a need to reduce the transmittance of the windshield, the regulator may regulate the power source to reduce the voltage provided to the PDLC film. If there is a need to increase the transmittance of the windshield, the regulator may regulate the power source to increase the voltage provided to the PDLC film.
[0037] In some embodiments, liquid crystals in the PDLC film may include dichroic dye. As a result, when the voltage supplied to the PDLC film by the power source equals 0, the windshield at the position corresponding to the PDLC film presents a color corresponding to the dichroic dye. When the voltage supplied to the PDLC film by the power source is greater than 0, the PDLC film at the corresponding desired position presents a transparent state.
[0038] In some embodiments, the liquid crystals in the PDLC film do not include dichroic dye. As a result, when the voltage supplied to the PDLC film by the power source equals 0, the windshield at the position corresponding to the PDLC film presents a translucent or opaque state. When the voltage supplied to the PDLC film by the power source is greater than 0, the PDLC film at the corresponding desired position presents a transparent state.
[0039] In a first specific example, referring to FIG. 2, from inner side to outer side of the vehicle, the windshield may successively include a first glass substrate 703, a polyvinyl butyral (PVB) film 702 and a second glass substrate 701 disposed as a stack, where the PDLC film 200 is attached to an outer surface of the first glass substrate 703.
[0040] In a second specific example, referring to FIG. 3, from inner side to outer side of the vehicle, the windshield may successively include a first glass substrate 804, a first PVB film 803, a second PVB film 802 and a second glass substrate 801 disposed as a stack, where the PDLC film 200 is disposed between the first PVB film 803 and the second PVB film 802.
[0041] In a third specific example, referring to FIG. 4, from inner side to outer side of the vehicle, the windshield may successively include a first glass substrate 901, a polyvinyl butyral (PVB) film 902 and a second glass substrate 903 disposed as a stack, where the PDLC film 200 is attached to an outer surface of the second glass substrate 903. Furthermore, an outer surface of the PDLC film 200 may be provided with a protective layer 900. The protective layer 900 may be a water proof film for protecting the PDLC film 200 from rain or vehicle washing water.
[0042] Specific structures and manufacturing techniques of the PDLC film 200 are well known in the art and thus are not illustrated in detail here.
[0043] In some embodiments, the PDLC film 200 may have a thickness ranging from 0.3 mm to about 2 mm, for example, the thickness may be 0.3 mm, 0.7 mm, 1.0 mm, 1.5 mm or 2.0 mm.
[0044] In some embodiments, the vehicle may include a power supply for providing direct current, while the power source may be an alternating current power source adapted for providing alternating current for the PDLC film. Therefore, in some embodiments, the shading device may further include a dc-ac converter (not shown in FIG. 1) coupled to the power source and the power supply, which is used to convert the direct current provided by the power supply into an alternating current.
[0045] The driving voltage, i.e., a working voltage provided by the power source, that the PDLC film needs to maintain a transparent appearance is mainly relative to dielectric index of the polymer and liquid crystals in the PDLC film, which is well known in the art and is not illustrated in detail here.
[0046] Specifically, in some embodiments, the power source may provide an alternating current with a working voltage ranging from about 20 V to about 50 V, for example, the working voltage may be 20 V, 30 V, 40 V, 50 V, or the like.
[0047] In practice, the power supply of the vehicle generally provides a working voltage of 12 V. When the working voltage provided by the power supply isn't equal to the required voltage of the power source, in some embodiments, the shading device may further include a transformer adapted to change the voltage.
[0048] In some embodiments, the regulator may be manually controlled or controlled by means of voice control by the user to simply and effectively adjust the inner light intensity of the vehicle.
[0049] Referring to FIG. 5, compared with the structure illustrated in FIG. 1, in some embodiments, the shading device may further include: a sensor 510 disposed on the glass 100, adapted for obtaining current light intensity information; and a controller 530 coupled to the sensor 510 and the regulator 400, adapted for controlling the regulator 400 to regulate the voltage according to the current light intensity information.
[0050] Specifically, the sensor 510 may be a light intensity sensor, which may be disposed on an inner surface, on an outer surface or inside of the glass 100, such that the sensor 510 can obtain the light intensity information corresponding to where it locates.
[0051] The controller 530 may be a single chip computer, a digital signal processor, or the like. Referring to FIG. 6, the controller 530 may include: an extraction unit 531, coupled to the sensor 510 and adapted for obtaining the light intensity information; a storage unit 532, adapted for storing corresponding relationships between different light intensity information and voltage values; an invoking unit 533, coupled to the extraction unit 531 and the storage unit 532, and adapted for invoking a target voltage value corresponding to the light intensity information; an acquiring unit 534, coupled to the regulator 400 and adapted for obtaining current status information of the regulator 400 to obtain a current voltage value currently applied to the PDLC film; a comparator 535, coupled to the invoking unit 533 and the acquiring unit 534, and adapted for calculating a difference value between the target voltage value and the current voltage value; and an adjusting unit 536, coupled to the regulator 400 and the comparator 535, and adapted for controlling the regulator 400 to regulate according to the difference value.
[0052] Specifically, the controller 530 may work as follows:
[0053] 1) Before the shading device starts to work, corresponding relationships between various light intensity information and values of voltages required to be provided by the power source 300 are prestored in the storage unit 532. The voltage corresponding to the current light intensity information is the target voltage value, which is corresponding to a desired light transmittance rate.
[0054] 2) When the sensor 510 obtains the current light intensity information, the extraction unit 531 extracts the current light intensity information from the sensor 510 and sends the current light intensity information to the invoking unit 533.
[0055] 3) The invoking unit 533 invokes from the storage unit 532 a voltage value, i.e., the target voltage value, corresponding to the current light intensity information, and sends the target voltage value to the comparator 535. If the regulator 400 can regulate the power source 300 to provide a voltage having the target voltage value to the PDLC film 200, the transmittance rate of the glass at the corresponding position may meet the user's requirement.
[0056] 4) The acquiring unit 534 obtains the current status information of the regulator 400, and thus obtains the value of the voltage currently supplied to the PDLC film 200 by the power source 300, and sends the obtained voltage value, i.e., the current voltage value, to the comparator 535.
[0057] 5) The comparator 535 obtains the target voltage value and the current voltage value, and calculates the difference value between them. If the glass transmittance rate at the corresponding position needs to be reduced, the PDLC film needs to be adjusted from a transparent state to an opaque state, so that the target voltage value should be lower than the current voltage value. If the glass transmittance rate at the corresponding position needs to be increased, the PDLC film needs to be adjusted from an opaque state to a transparent state, so that the target voltage value should be higher than the current voltage value.
[0058] 6) The adjusting unit 536 obtains the difference value from the comparator 535 and controls the regulator 400 to regulate the power source 300, such that the power source 300 may provide a voltage with the target voltage value to the PDLC film 200. When the glass transmittance rate at the corresponding position needs to be reduced, since the target voltage value is lower than the current voltage value, the regulator 400 needs to make the power source 300 reduce the voltage supplied to the PDLC film 200. When the glass transmittance rate at the corresponding position needs to be increased, since the target voltage value is higher than the current voltage value, the regulator 400 needs to make the power source 300 increase the voltage supplied to the PDLC film 200.
[0059] The controller 530 controls the regulator 400 to regulate the power source 300 to provide a suitable voltage to the PDLC film 200, thereby obtaining a desired transmittance rate at the corresponding position.
[0060] The corresponding relationships between the different light intensity information and the voltages may be pre-set and can also be changed at any time.
[0061] It should be noted that, when the sensor 510 is disposed on different surfaces of the glass, it may obtain different light intensity information, and so the corresponding voltages may be changed. [0062] In some embodiments, the shading device may further include: an audio player 550 coupled to the controller 530. When the controller 530 is controlling the regulator 400 to regulate, the audio player 550 may broadcast the light intensity information and regulation information to the user in time.
[0063] In some embodiments, the shading device as illustrated in FIG. 5 may work as follows:
[0064] 1) The sensor 510 obtains current light intensity information;
[0065] 2) The controller 530 obtains the current voltage value through the regulator 400 and the target voltage value according to the current light intensity information; and
[0066] 3) The controller 530 controls the regulator 400 to regulate the power source 300 according to a difference value between the target voltage value and the current voltage value, and controls the audio player 550 to broadcast corresponding audio information.
[0067] The sensor 510 is used to obtain the current light intensity information, and the controller 530 is employed to control the regulator 400 to automatically regulate the voltage supplied to the PDLC film 200, such that the user doesn't need to manually adjust the device and driving safety may be improved.
[0068] It should be noted that, in some embodiments, when the shading device as illustrated in FIG. 1 or FIG. 5 is used in a vehicle, the PDLC films may be disposed on different pieces of glass or at different positions of the same glass of the vehicle. Each PDLC film may have a corresponding regulator, a power source and a sensor. In some embodiments, a plurality of PDLC films may share a same controller and audio player. In such a way, according to various requirements, different transmittance rates for different pieces of glass or different positions of a same glass can be achieved. [0069] Accordingly, referring to FIG. 7, a shading method is provided according to one embodiment. The method may include:
[0070] Step SI, disposing a PDLC film on a glass corresponding to a desired shading position;
[0071] Step S2, obtaining a current light intensity information; and
[0072] Step S3, supplying, to the PDLC film, a voltage corresponding to the current light intensity information.
[0073] In some embodiments, the PDLC film may have a thickness ranging from about 0.3 mm to about 2 mm.
[0074] In some embodiments, liquid crystals in the PDLC film may be doped with dichroic dye. As a result, when the voltage supplied to the PDLC film by the power source equals 0, the PDLC film at the desired shading position presents a color corresponding to the dichroic dye. When the voltage supplied to the PDLC film by the power source is greater than 0, the PDLC film at the desired position presents a transparent state.
[0075] In some embodiments, the liquid crystals in the PDLC film may not include dichroic dye. As a result, when the voltage supplied to the PDLC film by the power source equals 0, the PDLC film at the desired shading position presents a translucent or opaque state. When the voltage supplied to the PDLC film by the power source is greater than 0, the PDLC film at the desired shading position presents a transparent state.
[0076] In some embodiments, the PDLC film may be disposed on a surface of the glass or inside of the glass.
[0077] In some embodiments, the glass may be a windshield of a vehicle.
[0078] By employing the method, the transmittance of the glass can be simply and effectively adjusted, and user comfort may be improved. [0079] Although the present disclosure has been disclosed as above with reference to preferred embodiments thereof but will not be limited thereto. Those skilled in the art can modify and vary the embodiments without departing from the spirit and scope of the present disclosure. Accordingly, without departing from the scope of the present invented technology scheme, whatever simple modification and equivalent variation belong to the protection range of the present invented technology scheme.

Claims

WHAT IS CLAIMED IS:
1. A shading device, comprising: a glass; a polymer dispersed liquid crystal (PDLC) film disposed on a portion of the glass corresponding to a desired shading position; a power source coupled to the PDLC film; and a regulator, coupled to the power source and adapted for regulating a voltage supplied to the PDLC film by the power source.
2. The shading device according to claim 1, wherein liquid crystals in the PDLC film are doped with a dichroic dye, when the voltage supplied to the PDLC film by the power source equals 0, the PDLC film at the desired shading position presents a color corresponding to the dichroic dye, and when the voltage supplied to the PDLC film by the power source is greater than 0, the PDLC film at the desired shading position presents a transparent state.
3. The shading device according to claim 1, wherein when the voltage supplied to the PDLC film by the power source equals 0, the PDLC film at the desired shading position presents a translucent or opaque state, and when the voltage supplied to the PDLC film by the power source is greater than 0, the PDLC film at the desired shading position presents a transparent state.
4. The shading device according to claim 1, wherein the power source is an alternating current power source which provides an operating voltage ranging from about 20 V to about 50 V.
5. The shading device according to claim 1, wherein the PDLC film has a thickness ranging from about 0.3 mm to about 2 mm.
6. The shading device according to claim 1, wherein the glass successively comprises, from an inner side to an outer side, a stack of a first glass substrate, a polyvinyl butyral film and a second glass substrate, where the PDLC film is disposed on an outer surface of the first glass substrate.
7. The shading device according to claim 1, wherein the glass successively comprises, from an inner side to an outer side, a stack of a first glass substrate, a polyvinyl butyral film and a second glass substrate, where the PDLC film is disposed on an outer surface of the second glass substrate, and the PDLC film is provided with a protective layer on an outer surface thereof.
8. The shading device according to claim 1, wherein the glass successively comprises, from an inner side to an outer side, a stack of a first glass substrate, a first polyvinyl butyral film, a second polyvinyl butyral film and a second glass substrate, where the PDLC film is disposed between the first polyvinyl butyral film and the second polyvinyl butyral film.
9. The shading device according to claim 1, further comprising:
a sensor, disposed on the glass and adapted for obtaining a current light intensity information;
a controller, coupled to the regulator and the sensor, and adapted for controlling, according to the current light intensity information, the regulator to regulate the voltage.
10. The shading device according to claim 9, wherein the controller comprises:
an extraction unit, coupled to the sensor and adapted for obtaining the current light intensity information;
a storage unit, adapted for storing corresponding relationships between different light intensity information and voltage values;
an invoking unit, coupled to the extraction unit and the storage unit, and adapted for invoking a target voltage value corresponding to the current light intensity information from the storage unit;
an acquiring unit, coupled to the regulator and adapted for obtaining a current status information of the regulator to obtain a current voltage value supplied to the PDLC film;
a comparator, coupled to the invoking unit and the acquiring unit, and adapted for calculating a difference value between the target voltage value and the current voltage value; and
an adjusting unit, coupled to the regulator and the comparator, and adapted for controlling the regulator to regulate the voltage according to the difference value.
11. The shading device according to claim 9, further comprising: an audio player coupled to the controller, adapted for presenting the corresponding light intensity information and regulation information when the controller is controlling the regulator to regulate the voltage.
12. A vehicle, comprising a shading device according to any one of claims 1 to 11.
13. A shading method, comprising:
disposing a polymer dispersed liquid crystal (PDLC) film on a glass corresponding to a desired shading position;
obtaining a current light intensity information; and
supplying, to the PDLC film, a voltage corresponding to the current light intensity information.
14. The shading method according to claim 13, wherein the PDLC film has a thickness ranging from about 0.3 mm to about 2 mm.
15. The shading method according to claim 13, wherein liquid crystals in the PDLC film are doped with a dichroic dye, when the voltage supplied to the PDLC film equals 0, the PDLC film at the desired shading position presents a color corresponding to the dichroic dye, and when the voltage supplied to the PDLC film is greater than 0, the PDLC film at the desired shading position presents a transparent state.
16. The shading method according to claim 13, wherein when the voltage supplied to the PDLC film equals 0, the PDLC film at the desired shading position presents a translucent or opaque state, and when the voltage supplied to the PDLC film is greater than 0, the PDLC film at the desired shading position presents a transparent state.
17. The shading method according to claim 13, wherein the PDLC film is disposed on a surface of the glass or inside of the glass.
18. The shading method according to claim 13, wherein the glass is a windshield of a vehicle.
EP14751132.3A 2013-02-17 2014-02-11 Shading device, vehicle and glass shading method Withdrawn EP2956322A4 (en)

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CN201310052008.8A CN103991366A (en) 2013-02-17 2013-02-17 Sun shading device, vehicle and glass sun shading method
PCT/CN2014/071978 WO2014124592A1 (en) 2013-02-17 2014-02-11 Shading device, vehicle and glass shading method

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EP2956322A4 (en) 2016-11-09
JP3215814U (en) 2018-04-12
DE202014011430U1 (en) 2020-06-15
JP2016505867A (en) 2016-02-25
WO2014124592A1 (en) 2014-08-21
CN103991366A (en) 2014-08-20
KR20150074066A (en) 2015-07-01

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