JP2009048078A - Liquid crystal microlens array - Google Patents

Liquid crystal microlens array Download PDF

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Publication number
JP2009048078A
JP2009048078A JP2007215960A JP2007215960A JP2009048078A JP 2009048078 A JP2009048078 A JP 2009048078A JP 2007215960 A JP2007215960 A JP 2007215960A JP 2007215960 A JP2007215960 A JP 2007215960A JP 2009048078 A JP2009048078 A JP 2009048078A
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liquid crystal
microlens array
substrate
embossed
crystal microlens
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JP2007215960A
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Japanese (ja)
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Hideji Naka
秀治 仲
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Citizen Holdings Co Ltd
シチズンホールディングス株式会社
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Abstract

The present invention relates to a liquid crystal microlens array capable of maintaining the thickness of a liquid crystal layer 8 and maintaining stable optical characteristics regardless of changes in ambient temperature.
In a liquid crystal microlens array 10 in which a plurality of rectangular liquid crystal lenses are arranged in an array, the plurality of liquid crystal lenses are hollow regions formed by bonding an embossed substrate 1 and a flat substrate 2a. The embossed substrate 1 and the flat substrate 2a are bonded and fixed at two diagonal points in each liquid crystal lens.
[Selection] Figure 1

Description

  In the present invention, a liquid crystal microlens array formed by filling a hollow region formed by bonding an embossed substrate and a flat substrate with a liquid crystal maintains a stable cell gap regardless of the environmental temperature. The present invention relates to a configuration of a liquid crystal microlens for maintaining good optical performance.

  Conventionally, in projection optical systems such as stereoscopic image display and rear projection television, and in imaging optical systems such as image sensors, various applications such as variable focus, variable aperture ratio, variable viewing angle, variable brightness, pixel shift, etc. A liquid crystal microlens array that can arbitrarily modulate optical characteristics according to the above has been proposed (see, for example, Patent Documents 1 and 2).

  Hereinafter, a configuration of a conventional liquid crystal microlens array will be described with reference to the drawings. FIG. 4 shows a cross-sectional view of the liquid crystal microlens array described in Patent Document 1. FIG. 5 illustrates a cross-sectional view of the liquid crystal microlens array described in Patent Document 2.

  The liquid crystal microlens array 13 shown in FIG. 4 has a frame-shaped two transparent substrates 14 each having an alignment film (not shown) for aligning liquid crystal molecules and a transparent electrode 4 for applying a voltage to the liquid crystal. It is formed by sealing with a sealing material 9 disposed on the surface and injecting liquid crystal and then closing the lid with a sealing material (not shown). Further, the liquid crystal microlens 13 shown in FIG. 4 is fixed by the sealing material 9 with a uniform thickness of the liquid crystal layer 8 through a spacer (not shown) so as to have a predetermined thickness.

  The liquid crystal microlens array 13 generates an electric field between the transparent electrodes 4 formed on the opposing transparent substrates 14 by applying a voltage, and the liquid crystal molecules are aligned along the generated electric field, whereby a refractive index is obtained. By obtaining the distribution, it is possible to obtain a lens effect with variable focus.

  Further, the liquid crystal microlens array 15 shown in FIG. 5 includes a transparent electrode (not shown) and an alignment film on each of the flat transparent substrates 14 facing the (embossed) transparent substrate 16 having a microlens-shaped recess. (Not shown) is formed, joined by a sealing material 9 arranged in a frame shape, and after the liquid crystal is injected, the lid is closed by a sealing material (not shown).

  The liquid crystal microlens array 15 shown in FIG. 5 can generate a lens effect due to a difference in refractive index between the transparent substrate 16 having a recess and the liquid crystal layer 8. For example, the refractive index of the transparent substrate 16 having a recess and the liquid crystal If the ordinary refractive index of the molecules is the same, the lens effect does not occur. If the extraordinary refractive index component of the liquid crystal molecules is expressed by voltage application, the lens effect can be obtained.

Japanese Patent Laid-Open No. 2002-214579 (page 11, FIG. 7-8) JP 2004-1396 A (pages 19-20, FIG. 23)

However, the conventional liquid crystal microlens arrays 13 and 15 disclosed in Patent Documents 1 and 2 shown in FIG. 4 and FIG. 5 cannot maintain optical characteristics at room temperature due to changes in environmental temperature. This phenomenon will be described with reference to FIG. FIGS. 6A-1 and 6B-1 are diagrams illustrating optical characteristics of the conventional liquid crystal microlens arrays 13 and 15 at room temperature. 6 (a-2) and 6 (b-2) are diagrams showing the influence on the optical characteristics when the conventional liquid crystal microlens arrays 13 and 15 are placed in a high temperature environment.

  As shown in FIGS. 6 (a-1) and 6 (b-1), by applying a voltage to the liquid crystal layer 8, the conventional liquid crystal microlenses 13 and 15 can each have a lens effect. At this time, it can be seen that the liquid crystal lenses arranged in an array exhibit similar light collecting characteristics. Here, as shown in FIGS. 6A-2 and 6B-2, the environmental temperature is changed, and the liquid crystal microlens arrays 13 and 15 are respectively driven in an environment of 70 ° C., for example. At this time, the liquid crystal layer 8 expands due to a change in the environmental temperature, so that the transparent substrate 14 holding the liquid crystal layer 8 and the transparent substrate 16 having the recess are each distorted. When the substrate is distorted in this way, as shown in FIGS. 6 (a-2) and 6 (b-2), there is a difference in light collecting characteristics depending on the location of the liquid crystal lenses arranged in an array. I understand.

  As described above, the conventional liquid crystal microlens arrays 13 and 15 have a problem in that, due to a change in environmental temperature, a difference in light collection characteristics depending on a place, which causes a curvature aberration or a distortion aberration. It was.

  Therefore, the present invention provides a liquid crystal microlens array that can prevent the occurrence of bending aberration and distortion aberration regardless of the environmental temperature, can maintain optical performance, has a simple and inexpensive configuration, and has excellent mass productivity. For the purpose.

  In order to solve the above problems, the liquid crystal microlens array of the present invention basically has the following configuration.

  The liquid crystal microlens array of the present invention is a liquid crystal microlens array in which a plurality of liquid crystal lenses are arranged in an array, and a plurality of liquid crystal lenses are liquid crystal in a hollow region formed by bonding an embossed substrate and a flat substrate. The embossed convex portion of each liquid crystal lens and the contact portion between the flat substrate and the embossed convex portion of each liquid crystal lens and the flat substrate are disposed. It is characterized by being bonded and fixed.

  The liquid crystal microlens array of the present invention is characterized in that the shape of the plurality of liquid crystal lenses is a polygonal shape.

  The liquid crystal microlens array of the present invention is characterized in that the polygonal shape is a quadrangular shape.

  In addition, the liquid crystal microlens array of the present invention is characterized by being bonded and fixed at four corners of a square shape.

  In the liquid crystal microlens array of the present invention, the embossed substrate is a substrate formed by pressing a mold against a resin applied to the surface of a flat substrate.

  Furthermore, in the liquid crystal microlens array of the present invention, an embossed substrate is coated with an uncured resin after an electrode for forming a refractive index distribution on the liquid crystal lens is provided on the surface of another flat substrate. The substrate is formed by pressing a mold against the resin.

  According to the present invention, it is possible to provide a liquid crystal microlens array having a simple and inexpensive configuration, excellent in mass productivity, and capable of preventing the occurrence of bending aberration and distortion regardless of the environmental temperature.

  The configuration of the liquid crystal microlens array of the present invention will be described below.

  A liquid crystal microlens array according to the present invention will be described with reference to FIG. FIG. 1 is an upper plan view showing a liquid crystal microlens array 10 according to the first embodiment, and an AA cross-sectional view in this plan view.

  As shown in FIG. 1, a liquid crystal microlens 10 of the present invention includes a flat substrate 2a on which a transparent electrode 4 and an alignment film 5 are formed, and a resin layer having an uneven surface formed on the surface of the flat substrate 2b. 3 and an embossed substrate 1 in which a transparent electrode 4 and an alignment film are respectively formed on the concavo-convex surface, and a plurality of liquid crystal layers 8 disposed in a hollow region formed by a recess in the resin layer 3. The liquid crystal lenses are arranged in an array.

  In addition, the transparent electrode 4 and the alignment film 5 formed on the surface of each of the embossed substrate 1 and the flat substrate 2a are collectively fed to the liquid crystal layer 8 in each liquid crystal lens sandwiched between the substrates, A difference in refractive index from the resin layer 3 can be imparted to the light beam incident on the liquid crystal layer 8.

  In addition, each liquid crystal lens in the liquid crystal microlens array 10 of the present invention has a quadrangular shape, and the embossed substrate 1 and the flat substrate 2a are convex portions of the resin layers 3 at the four corners of the square liquid crystal lens. It is the form fixed through the adhesive agent 7 in the location.

  In this way, if the convex portions on the diagonal of the resin layer 3 that are the four corners of the quadrangular liquid crystal lens are fixed with the adhesive 7, as in the conventional configuration, the array shape is changed by the change of the external environment temperature. The liquid crystal microlens array in which the optical lens characteristics of the individual liquid crystal lenses arranged in the liquid crystal lens hardly change and each liquid crystal lens arranged in an array always exhibits stable optical lens characteristics can be obtained. Details of the operation of the optical lens characteristics of the present invention will be described later.

  Further, the liquid crystal microlens array 10 of the present invention is not limited to the form in which the rectangular liquid crystal lenses are arranged in an array as described above, and the liquid crystal lenses are arranged in a close-packed manner on a plane. For example, each liquid crystal lens may have a hexagonal shape, and two diagonal points serving as convex portions in the resin layer 3 may be fixed by the adhesive 7.

  In this hexagonal liquid crystal lens, it is not necessary that all the six embossed convex portions are bonded and fixed to the flat substrate, and at least two or more arbitrary portions are bonded and fixed. It ’s fine.

Next, the optical characteristics of the liquid crystal microlens array 10 of the present invention will be described.
FIG. 2A is a diagram showing the optical characteristics of the liquid crystal microlens array 10 according to the present invention at normal temperature, and FIG. 2B is a diagram showing the influence on the optical characteristics in a high temperature environment.

As shown in FIG. 2A, by applying a voltage to the liquid crystal layer 8, a difference in refractive index occurs between the liquid crystal layer 8 and the embossed resin layer 3, thereby obtaining a lens effect. . At this time, the liquid crystal lenses arranged in an array exhibit substantially the same light collection characteristics. Next, as shown in FIG. 2B, the liquid crystal microlens array 10 is driven by changing the environmental temperature to an environment of 70 ° C., for example. At this time, since the liquid crystal microphone lens array 10 of the present invention is fixed to the flat substrate 2a opposite to each other at two diagonal points of each liquid crystal lens formed in an embossed shape by the adhesive layer 7, the external environment Even if the liquid crystal layer 8 expands due to a change in temperature, the liquid crystal lenses arranged in an array form all the liquid crystals because the shapes of the embossed substrate 1 and the flat substrate 2a are hardly distorted between the liquid crystal lenses. It can be seen that the lens has almost the same light collecting characteristics as at room temperature. This is because the thickness of the liquid crystal layer 8 can be more effectively maintained by fixing the four corners of each liquid crystal lens to the opposing flat substrate 2a.

  As described above, according to the present invention, even if the liquid crystal expands or contracts due to the change in the environmental temperature, the upper and lower substrates sandwiching the liquid crystal are fixed by the adhesive 7, so that the external environmental temperature is Even if various changes are made, the substrate of each liquid crystal lens arranged in an array is not distorted, and the occurrence of bending aberration and distortion is prevented as much as possible, and a liquid crystal microlens array having stable light collecting characteristics can be obtained.

  In the above description, the configuration example in which all the two diagonal points (four corners) of the quadrangular liquid crystal lens are fixed with the adhesive 7 has been described. However, it is difficult to receive the effect of the optical characteristics of the present invention described above. The two opposing points in the four corners of the liquid crystal lens may be fixed with the adhesive 7 and the other two opposing points may not be fixed.

Next, a method for manufacturing the liquid crystal microlens will be described with reference to FIG.
First, a transparent resin is uniformly formed on the flat substrate 2b by spin coating or printing. By curing the transparent resin in a state in which a mold having a microlens array shape in which square lenses as shown in the upper plan view of FIG. 1 are arranged in an array is pressed against the uniformly formed transparent resin. The resin layer 3 having an embossed shape is molded. And after forming the transparent electrode 4 and the alignment film 5 for aligning a liquid crystal molecule on the surface of the resin layer 3 which has this embossed shape, and forming the embossed substrate 1, the diagonal in each lens part of an embossed shape is formed. Adhesive layer 7 is applied to the top vertex (opposite convex portion of resin layer 3). Next, the flat substrate 2a is obtained by forming the transparent electrode 4, the alignment film 5, and the insulating film 6 on the substrate surface.

  Next, a frame-shaped sealing material 9 surrounding the outer periphery of the substrate is disposed so as to be higher than the convex portion formed on the embossed substrate 1. The flat substrate 2a facing the embossed substrate 1 is overlapped via the sealing material 9, and pressure is applied so that the flat substrate 2a adheres to the adhesive layer 7 provided at the top of the embossed convex portion. After the sealing material 9 and the adhesive layer 7 are cured in such a pressurized state, the liquid crystal layer 8 is formed by injecting liquid crystal into the hollow region formed by the concave portion of the resin layer 3 by a vacuum injection method. By sealing with a sealing material (not shown), the liquid crystal microlens array 10 having a uniform thickness is completed.

  Thus, even when the flat substrate 2a facing the embossed substrate 1 is bonded, the insulating film 6 is formed on the surface of the flat substrate 2a in contact with the liquid crystal layer 8; Thus, the highly reliable liquid crystal microlens array 10 in which the transparent electrode 4 formed in the above does not conduct can be obtained. And according to this structure, it can be set as the liquid crystal microlens array 10 with high mass productivity with an inexpensive structure.

  The resin layer 3 for forming the embossed shape may be a thermoplastic or thermosetting resin. However, when the UV curable resin is used, the resin layer 3 is unnecessary when the UV light is irradiated. Masking a portion to be formed (for example, a range in which a sealing material 9 or a sealing material (not shown) surrounding the liquid crystal layer 8 in a frame shape is disposed from the viewpoint of reliability such as moisture permeability of the resin layer 3). It is preferable because an uncured portion is formed and then the uncured portion can be easily removed by washing.

  In addition, the transparent electrode 4 and the alignment film 5 formed on the resin layer 3 formed into an embossed shape are preferably formed at a temperature lower than the Tg point of the resin layer 3 from the viewpoint of heat resistance of the resin layer 3. Furthermore, the sealing material 9 and the adhesive layer 7 are preferably UV curable rather than thermosetting from the viewpoint of heat resistance of the resin layer 3.

  Further, the embossed substrate 1 may be formed into a microlens array shape by polishing a transparent substrate. However, from the viewpoint of productivity, the embossed substrate 1 is made of gold on the resin layer 3 as shown in the present embodiment. A so-called nanoimprint manufacturing method for transferring a mold is preferred. The mold having the microlens array shape may be a hexagonal microlens shape that is a close-packed type, but in the present embodiment, a more preferable rectangular microlens is preferable from the viewpoint of mold workability. The shape was taken as an example. In this embodiment, nematic liquid crystal having homogeneous alignment is used for the liquid crystal layer 8 sandwiched between the embossed substrate 1 and the flat substrate 2a. However, vertical alignment type liquid crystal can also be used. It is.

  Next, another configuration of the liquid crystal microlens array of the present invention will be described with reference to FIG. FIG. 3 is an upper plan view showing a liquid crystal microlens array 12 according to the second embodiment, and a cross-sectional view taken along line BB in this plan view.

  The difference between the configuration of the liquid crystal microlens array 12 described in the present embodiment and the configuration of the liquid crystal microlens array 10 of the first embodiment described above is that the formation position of the transparent electrode 4 formed on the embossed substrate 11 Since only the presence / absence of the insulating film 6 shown in FIG. 1 and other configurations are the same, in the following description, the formation position of the transparent electrode 4 and the presence / absence of the insulating film 6, which are characteristic portions in the present embodiment, Is mainly described.

  As described above, the liquid crystal microlens 12 of the present embodiment has the embossed resin layer 3 on the upper surface of the transparent electrode 4 formed on the surface of the flat substrate 2b, and further includes a concave portion on the surface thereof. An embossed substrate 11 provided with an alignment film 5, a flat substrate 2 a having a transparent electrode 4 and an alignment film 5 on the surface, an adhesive 7 provided on a convex portion in the resin layer 3, and an outer periphery of the substrate are covered. It is in a form where it is bonded and fixed via a sealing material 9 formed in this manner.

  With this configuration, the liquid crystal microlens array 12 in this embodiment can maintain stable optical characteristics regardless of changes in the external environmental temperature. Since it is the same as that of the microlens array 10, a detailed description thereof is omitted here.

  Moreover, since the transparent electrode 4 is formed between the resin layer 3 and the flat substrate 2b, it is necessary to arrange the insulating film shown in Example 1 in order to suppress conduction of the transparent electrode 4 arranged above and below. And the microlens configuration is further simplified.

Next, a method for manufacturing the liquid crystal microlens array 12 in the present embodiment will be described.
First, the transparent electrode 4 is formed on the flat substrate 2b, and the transparent resin is uniformly formed on the transparent electrode 4 by spin coating, printing, or the like, similarly to the configuration described above. A resin layer 3 having an embossed shape is formed by curing the transparent resin in a state where a mold having a square microlens array shape as shown in the upper plan view of FIG. 3 is pressed against the uniformly formed transparent resin. Is molded.

Next, after forming the alignment film 5 for aligning liquid crystal molecules on the surface of the resin layer 3 having the embossed shape to form the embossed substrate 11, the apexes on the diagonal of each embossed lens portion The adhesive layer 7 is applied to the substrate. Moreover, the flat substrate 2a is formed by forming the transparent electrode 4 and the alignment film 5 on the substrate surface. However, in this embodiment, an insulating film as shown in the AA sectional view of FIG. 1 is not provided.

  Next, the frame-shaped sealing material 9 surrounding the outer periphery of the substrate is disposed so as to be higher than the convex portion formed on the embossed substrate 11. The embossed substrate 11 and the opposing flat substrate 2a are overlapped with each other through the sealing material 9 so that the flat substrate 2a is adhered to the adhesive layer 7 provided at the top of the embossed convex portion. Press. After the sealing material 9 and the adhesive layer 7 are cured in such a pressurized state, the liquid crystal layer 8 is formed by injecting liquid crystal into the hollow region formed by the concave portion of the resin layer 3 by a vacuum injection method. By sealing with a sealing material (not shown), the liquid crystal microlens array 12 having a uniform thickness is completed.

  Thus, after forming the transparent electrode 4 on the surface of the flat substrate 2b, by forming the resin layer 3 having an embossed shape, the transparent electrode 4 can be formed at a high temperature. It becomes the form which has a merit. This is because the transparent electrode 4 can promote crystallization by forming a film at a high temperature, and can form a film with a lower resistance. As described above, since the film can be formed on the substrate surface with low resistance, the film thickness of the transparent electrode 4 can be made thinner than that of the embodiment shown in Example 1, and the liquid crystal microlens array 12 of the present invention. It is possible to improve the light utilization efficiency.

It is the upper part top view and sectional drawing which show the structure of the liquid crystal microlens array of this invention. It is a figure which shows the optical characteristic in the change of the environmental temperature of the liquid crystal microlens array of this invention. It is the upper part top view and sectional drawing which show the structure of the liquid crystal microlens array of this invention. It is sectional drawing which shows the structure of the conventional liquid crystal microlens array. It is sectional drawing which shows the structure of the conventional liquid crystal microlens array. It is a figure which shows the optical characteristic in the change of the environmental temperature of the conventional liquid crystal microlens array.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Embossed substrate 2a, 2b Flat substrate 3 Resin layer 4 Transparent electrode 5 Alignment film 6 Insulating film 7 Adhesive layer 8 Liquid crystal layer 9 Sealing material 10, 12, 13 Liquid crystal microlens array 14 Transparent substrate

Claims (6)

  1. In a liquid crystal microlens array in which a plurality of liquid crystal lenses are arranged in an array,
    The plurality of liquid crystal lenses are formed by filling liquid crystal into a hollow region formed by bonding an embossed substrate and a flat substrate, and the embossed convex portions of the liquid crystal lenses and the flat substrate. The liquid crystal microlens array is characterized in that the abutting part of the liquid crystal is bonded and fixed.
  2. The liquid crystal microlens array according to claim 1, wherein the plurality of liquid crystal lenses have a polygonal shape.
  3. The liquid crystal microlens array according to claim 2, wherein the polygonal shape is a quadrangular shape.
  4. The liquid crystal microlens array according to claim 3, wherein the liquid crystal microlens array is fixed by bonding at four corners of the quadrangle.
  5. The liquid crystal microlens according to any one of claims 1 to 4, wherein the embossed substrate is a substrate formed by pressing a mold against a resin applied to a surface of the flat substrate. array.
  6. In the embossed substrate, an electrode for forming a refractive index distribution in the liquid crystal lens is provided on the surface of another flat substrate, and then an uncured resin is applied and a mold is pressed against the resin. The liquid crystal microlens array according to claim 5, wherein the liquid crystal microlens array is a substrate molded by the following method.
JP2007215960A 2007-08-22 2007-08-22 Liquid crystal microlens array Pending JP2009048078A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104849938A (en) * 2015-05-28 2015-08-19 江苏双星彩塑新材料股份有限公司 Liquid crystal lens component for 2D/3D switchable display and display
CN105573006A (en) * 2016-03-02 2016-05-11 南京大学 Electronic paper of three-dimensional pixel structure
US9462166B2 (en) 2013-03-19 2016-10-04 Kabushiki Kaisha Toshiba Imaging device, portable information terminal, and display device
CN106468842A (en) * 2016-12-27 2017-03-01 宁波视睿迪光电有限公司 Birefringent lens film and its manufacture method
US9781311B2 (en) 2013-03-22 2017-10-03 Kabushiki Kaisha Toshiba Liquid crystal optical device, solid state imaging device, portable information terminal, and display device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9462166B2 (en) 2013-03-19 2016-10-04 Kabushiki Kaisha Toshiba Imaging device, portable information terminal, and display device
US9781311B2 (en) 2013-03-22 2017-10-03 Kabushiki Kaisha Toshiba Liquid crystal optical device, solid state imaging device, portable information terminal, and display device
CN104849938A (en) * 2015-05-28 2015-08-19 江苏双星彩塑新材料股份有限公司 Liquid crystal lens component for 2D/3D switchable display and display
CN105573006A (en) * 2016-03-02 2016-05-11 南京大学 Electronic paper of three-dimensional pixel structure
CN105573006B (en) * 2016-03-02 2019-04-05 南京大学 A kind of Electronic Paper of voxel structure
CN106468842A (en) * 2016-12-27 2017-03-01 宁波视睿迪光电有限公司 Birefringent lens film and its manufacture method

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