KR20160140294A - Electronic Controllable Apperture and Electronic Apparatus using the Same - Google Patents

Electronic Controllable Apperture and Electronic Apparatus using the Same Download PDF

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Publication number
KR20160140294A
KR20160140294A KR1020150099068A KR20150099068A KR20160140294A KR 20160140294 A KR20160140294 A KR 20160140294A KR 1020150099068 A KR1020150099068 A KR 1020150099068A KR 20150099068 A KR20150099068 A KR 20150099068A KR 20160140294 A KR20160140294 A KR 20160140294A
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KR
South Korea
Prior art keywords
diaphragm
light
diaphragm plate
driving
liquid crystal
Prior art date
Application number
KR1020150099068A
Other languages
Korean (ko)
Inventor
전국진
김유미
Original Assignee
서울대학교산학협력단
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Application filed by 서울대학교산학협력단 filed Critical 서울대학교산학협력단
Publication of KR20160140294A publication Critical patent/KR20160140294A/en

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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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/02—Diaphragms
    • G03B9/04—Single movable plate with two or more apertures of graded size, e.g. sliding plate or pivoting plate

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Liquid Crystal (AREA)
  • Diaphragms For Cameras (AREA)

Abstract

According to an embodiment of the present invention, an aperture includes: a transparent substrate; at least one aperture plate unit formed on the transparent substrate to block or transmit light by means of a driving signal; and at least one conducting wire providing the driving signal to the aperture plate unit. The at least one aperture plate unit includes a liquid crystal transmitting or blocking light by means of a control signal.

Description

[0001] The present invention relates to an electronic controllable iris and an electronic device using the same,

The present invention relates to an electronically controllable diaphragm and an electronic apparatus using the diaphragm.

Aperture is a component of a commonly used camera lens, which corresponds to the pupil of the eye and serves to change the effective aperture of the camera lens. As the pupil of the eye expands, the amount of light passing through the pupil increases, and as the amount of light passing through the pupil decreases, the aperture determines the amount of light passing through and the depth of field.

Conventional electronically controlled diaphragms have controlled the area of the light-transmitting portion mechanically or by using an opaque liquid in an electrowetting manner.

The mechanically controlled iris must be driven with a driving voltage of 100V for driving. Further, a voltage of 60 V to 70 V must be provided for driving the diaphragm controlled in the electro-wetting manner.

However, these days, electronic devices are in a low power consumption trend, and accordingly, the voltage required for driving is continuously decreasing, and it is problematic to apply 60V-70V or higher voltage to current electronic devices have.

One of the objects of the present invention is to provide a diaphragm which can be driven at a lower voltage than the prior art diaphragm driving voltage by overcoming the shortcomings of the diaphragm according to the related art. One of the objects of the present embodiment is to provide a diaphragm which can be driven at a high operating speed. In addition, one of the other objects of the present embodiment is to provide a diaphragm which can be implemented in a small size.

The diaphragm according to the present embodiment includes a transparent substrate, at least one aperture plate unit formed on the transparent substrate and blocking or transmitting light by a driving signal, And at least one diaphragm plate includes a liquid crystal that transmits light or blocks light by a control signal.

The electronic device according to the present embodiment is provided with a transparent substrate and a diaphragm and a driving signal including liquid crystal and formed on the transparent substrate and including at least one diaphragm plate for blocking or transmitting light by a driving signal, And a lead that provides a driving signal to the diaphragm provided by the control unit.

According to this embodiment, since light is transmitted or blocked by using liquid crystal, there is provided an advantage that a diaphragm which can be driven with a low voltage is provided. Further, according to this embodiment, since light is transmitted or blocked by using liquid crystal, an advantage is provided that a diaphragm having a high operation speed is provided.

1 is a top view showing an outline of a diaphragm according to the present embodiment.
FIG. 2 is a cross-sectional view showing a surface cut along a cutting line AA 'in FIG. 1; FIG.
3 (a) and 3 (b) are views showing operation examples of this embodiment.
4 (a) and 4 (b) show an outline of the implementation of the diaphragm according to the present embodiment.
5 is a block diagram showing an outline of an electronic device including a diaphragm according to the present embodiment.

The description of the present invention is merely an example for structural or functional explanation, and the scope of the present invention should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the present invention should be understood to include equivalents capable of realizing technical ideas.

Meanwhile, the meaning of the terms described in the present application should be understood as follows.

The terms " first ", " second ", and the like are used to distinguish one element from another and should not be limited by these terms. For example, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "on" or "on" another element, it may be directly on top of the other element, but other elements may be present in between. On the other hand, when an element is referred to as being "in contact" with another element, it should be understood that there are no other elements in between. On the other hand, other expressions that describe the relationship between components, such as "intervening" and "intervening", between "between" and "immediately" or "neighboring" Direct neighbors "should be interpreted similarly.

It should be understood that the singular " include "or" have "are to be construed as including a stated feature, number, step, operation, component, It is to be understood that the combination is intended to specify that it is present and not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

Each step may take place differently from the stated order unless explicitly stated in a specific order in the context. That is, each step may occur in the same order as described, may be performed substantially concurrently, or may be performed in reverse order.

The drawings referred to for explaining embodiments of the present disclosure are exaggerated in size, height, thickness, and the like intentionally for convenience of explanation and understanding, and are not enlarged or reduced in proportion. In addition, any of the components shown in the drawings may be intentionally reduced, and other components may be intentionally enlarged.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Terms such as those defined in commonly used dictionaries should be interpreted to be consistent with the meanings in the context of the relevant art and can not be construed as having ideal or overly formal meaning unless explicitly defined in the present application .

Hereinafter, a diaphragm according to the present embodiment will be described with reference to the accompanying drawings. FIG. 1 is a top view showing an outline of a diaphragm according to the present embodiment, and FIG. 2 is a sectional view showing a plane cut along a cutting line AA 'in FIG. 1 and 2, the diaphragm includes a transparent substrate sub a , sub b , at least one aperture plate unit formed on the transparent substrate and shielding or transmitting light by a driving signal, And at least one wire (200) providing a driving signal to the diaphragm plate, wherein the at least one diaphragm plate includes a liquid crystal that transmits or blocks the light according to the control signal do. In one example, the diaphragm further includes a light shield plate 300 that shields light.

The common electrode 100com and the driving electrodes 100a, 100b, 100com, and 100d are formed on the transparent substrates sub a and sub b . Since the light passing through the diaphragm must transmit through the transparent substrate (sub a , sub b ), the transparent substrate is formed of a material that transmits light. For example, the transparent substrate may be formed of glass. As another example, the transparent substrate may be formed of synthetic resin such as transparent polyethylene terephthalate (PET), transparent acrylic and transparent polycarbonate.

Upper (sub a) of the pair of transparent substrates (sub a, sub b), the common electrode (100com) is formed, and a lower plate (sub b) there is the driving electrode (100a, 100b, 100c, 100d ) is formed . In one embodiment, when the diaphragm is controlled so as to transmit light, light must be transmitted through the driving electrode and the common electrode, so that the driving electrode and the common electrode must be light transmissive like the substrate. The driving electrodes 100a, 100b, 100c, and 100d and the common electrode 100com are formed of a material having electric conductivity because they must provide an electric field to the liquid crystal LC by receiving a driving signal. For example, it is formed of a transparent conductive material such as indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO), or indium cadmium oxide (ICO). In another embodiment, the driving electrodes 100a, 100b, 100com, and 100d and the common electrode 100com may be formed of a carbon nanotube film. The CNT film can flow a current having a higher density than a transparent conductive material such as ITO.

The driving electrodes 100a, 100b, 100c, and 100d are disposed to be spaced apart from each other by a predetermined distance to prevent electrical shorts. As an example, the driving electrodes may be disposed at a distance of 1 [mu] m to 20 [mu] m.

In one embodiment, the diaphragm may further include a light-shielding film 300. The light-shielding film 300 prevents light from passing through other parts than the diaphragm plate for controlling the light to pass through or block. For example, the light-shielding film 300 is formed of chromium having good light shielding properties, interaction with the liquid crystal LC, and adhesiveness to the lower driving electrode, and is formed by depositing a chromium film and patterning. As another example, the light-shielding film 300 may be formed of a polymer.

The liquid crystal LC is positioned between the driving electrodes 100a, 100b, 100c, and 100d and the common electrode 100com. The arrangement direction of the liquid crystal changes by an electrical signal provided to the driving electrode. Therefore, it is possible to control the arrangement direction of the liquid crystal by an electrical signal so that light can not transmit or transmit through the polarizing plates 400a and 400b.

There are several liquid crystals such as TN, IPS and VA depending on the kind of the liquid crystal, and thus the driving method of the liquid crystal can be different. However, this embodiment can be implemented by any of these liquid crystal driving methods.

In an embodiment, an alignment layer (not shown) is formed on the surfaces of the common electrode 100com and the driving electrodes 100a, 100b, 100c, and 100d that are in contact with the liquid crystal to form alignment directions of liquid crystals. A groove is formed in the alignment film, and one end and the other end of the liquid crystal are fixed to the grooves, respectively, so that the liquid crystal alignment direction is formed. For example, the alignment layer may be formed of a polyimide layer.

Polarizers 400a and 400b are disposed on the outer surface of the transparent substrate. For example, the transmission axes of the polarizers 400a and 400b may be arranged to be staggered from each other, and preferably, the transmission axes of the polarizers 400a and 400b may be arranged at 90 degrees to each other.

In one embodiment, a sealant (S) may be formed in the periphery of the diaphragm to prevent the liquid crystal LC from flowing out to the outside or from the outside. The sealant S is formed of an adhesive material so that the upper plate sub a and the lower plate sub b can be joined. For example, the sealing portion may function as a spacer capable of maintaining a constant distance between the upper plate sub a and the lower plate sub b .

Each of the driving electrodes 100a, 100b, 100c, and 100d is supplied with driving signals through the wires 200a, 200b, 200c, and 200d. As described above, the wires 200a, 200b, 200c, and 200d are electrically connected to the driving electrodes of the diaphragm plates 100a, 100b, 100com, and 100d. Also, the wires 200a, 200b, 200c, and 200d are wired through the channel CH so as not to contact the undesired driving electrodes. 1 illustrates that the wires 200a, 200b, 200c, and 200d are wired through one channel CH, but according to another example not shown, The driving signal can be transmitted to the driving electrode.

Hereinafter, the driving of the diaphragm having the above-described configuration will be described. If the driving signal is not provided, the liquid crystal molecules remain twisted, and thus transmit through the polarizers 400a and 400b. However, when a driving signal is provided to the driving electrode 100d of the diaphragm plate D through the line 200d, an electric field is formed between the driving electrode 100d and the common electrode 100com.

The arrangement of the liquid crystals located between the common electrode 100com and the driving electrode 100d changes in a line by the influence of the electric field. Therefore, unlike the case where the arrangement direction of the liquid crystal LC is twisted and the light can pass between the polarizers 400a and 400b, the liquid crystals are arranged in a line. Therefore, the light can not be transmitted by the polarizing plate arranged with the transmission axes staggered from each other and blocked.

Therefore, the result of this operation example is shown in FIG. 3 (a). That is, in the diaphragm plate D, since the alignment direction of the liquid crystal is changed by the provided driving signal, the light is blocked, but the driving signal is not provided to the remaining diaphragm plates, so that the liquid crystal array direction is kept twisted, have.

Further, when the amount of light transmitted through the diaphragm is to be further reduced, a driving signal is supplied to the driving electrode 100com of the diaphragm plate C by providing a driving signal through the line 200c. Accordingly, the driving electrode 100c and the common electrode 100com electric field are formed in the diaphragm plate (see Fig. 2C). Therefore, since the arrangement direction of the liquid crystal LC changes, the light can not be transmitted, and therefore, the light can not be transmitted as shown in Fig. 3 (b).

Although the above description shows an example of blocking light from the outer diaphragm plate to the inside, it is merely an explanation, and it is also possible to block or transmit light from the inside to the outside, It is also possible to control to block or transmit.

4 (a) and 4 (b) show an outline of the implementation of the diaphragm according to the present embodiment. Referring to FIG. 4 (a), a portion of the diaphragm may be configured to transmit light without a configuration for blocking light. As shown, a portion of the diaphragm can always be configured to transmit light. FIG. 4 (b) is a view showing an example in which the diaphragm according to the present embodiment is implemented in a rectangular shape.

As shown in the drawing, each of the diaphragm plates according to the present embodiment may have a hollow shape having a center hole, and the shape thereof may be a ring shape or a square shape such as a square shape. Further, at least a part of the diaphragm can be formed as a portion which always transmits light without blocking light.

5 is a block diagram showing an outline of an electronic device including a diaphragm according to the present embodiment. Referring to FIG. 5, the electronic device may include a control unit CON for forming a control signal for blocking or transmitting light through a diaphragm, a line 200 for providing a control signal to the diaphragm, and a diaphragm. The control unit CON provides a driving signal that can change the alignment direction of the liquid crystal as described in the above embodiment. In one embodiment, the control unit may be an image processing chip, an application processor, or a camera module control chip of a terminal such as a camera, a mobile phone, or a tablet.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It will be appreciated that other embodiments are possible. Accordingly, the true scope of the present invention should be determined by the appended claims.

100: diaphragm 100a, 100b, 100c, 100d:
100com: common electrode
200: conductors 200a, 200b, 200c, 200d: conductors
300:

Claims (16)

A pair of transparent substrates facing each other;
At least one aperture plate unit formed on the transparent substrate and blocking or transmitting light by a driving signal,
Wherein the at least one diaphragm plate includes a liquid crystal that transmits the light or blocks the light by the control signal, wherein the at least one diaphragm plate includes a diaphragm, . The method according to claim 1,
The diaphragm plate portion,
A common electrode disposed on one of the pair of transparent substrates,
A driving electrode disposed on the other of the pair of transparent substrates;
And the liquid crystal arranged between the common electrode and the driving electrode. 3. The method of claim 2,
Wherein the driving signal is provided to the driving electrode through the lead. The method according to claim 1,
Wherein the at least one diaphragm plate portion comprises:
Wherein each of the diaphragm plates is spaced apart from the other diaphragm plate. The method according to claim 1,
Wherein the at least one diaphragm plate portion comprises:
A ring-shaped diaphragm having a common center and a different size. The method according to claim 1,
The diaphragm has a transmissive portion that transmits light at the center,
And the diaphragm plate portion is disposed around the transmissive portion. The method according to claim 1,
Wherein the diaphragm further comprises a light shielding film for blocking light. 8. The method of claim 7,
Wherein the light-shielding film comprises chrome (Cr). The method according to claim 1,
The diaphragm
And a polarizer is disposed on each of the pair of transparent substrates. A pair of transparent substrates facing each other, a diaphragm including a liquid crystal and at least one diaphragm plate formed on the transparent substrate and blocking or transmitting light by a driving signal;
A control unit for providing the driving signal to control the iris to block or transmit light,
And a lead for providing a drive signal provided by the control unit to the diaphragm. 11. The method of claim 10,
The diaphragm plate portion,
A common electrode disposed on one of the pair of transparent substrates,
A driving electrode disposed on the other of the pair of transparent substrates;
And the liquid crystal arranged between the common electrode and the driving electrode. 11. The method of claim 10,
Wherein the at least one diaphragm plate portion comprises:
Wherein each of the diaphragm plates is spaced apart from the other diaphragm plate. 11. The method of claim 10,
Wherein the at least one diaphragm plate portion comprises:
A ring-shaped electronic device having a common center and a different size. 11. The method of claim 10,
Wherein the diaphragm further comprises a light shielding film for shielding light. 15. The method of claim 14,
Wherein the light-shielding film comprises chrome (Cr). 11. The method of claim 10,
And a polarizer is arranged outside the transparent substrate.
KR1020150099068A 2015-05-28 2015-07-13 Electronic Controllable Apperture and Electronic Apparatus using the Same KR20160140294A (en)

Applications Claiming Priority (2)

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KR1020150075297 2015-05-28
KR20150075297 2015-05-28

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019225980A1 (en) * 2018-05-23 2019-11-28 엘지전자 주식회사 Diaphragm device, camera and terminal having same
CN112255860A (en) * 2019-07-22 2021-01-22 点晶科技股份有限公司 Mobile communication device, optical assembly and aperture module thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019225980A1 (en) * 2018-05-23 2019-11-28 엘지전자 주식회사 Diaphragm device, camera and terminal having same
CN112255860A (en) * 2019-07-22 2021-01-22 点晶科技股份有限公司 Mobile communication device, optical assembly and aperture module thereof
JP2021018428A (en) * 2019-07-22 2021-02-15 點晶科技股▲ふん▼有限公司 Mobile apparatus, optical assembly, and aperture module thereof

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