KR0135922B1 - Liquid crystal projector and liquid crystal display device using micro lens plate - Google Patents

Abstract

The liquid crystal layer 6 is enclosed between the opposing substrate 9 of the liquid crystal display element and the transparent organ 1. The counter substrate 9 is composed of a transparent substrate 1, a microlens 2 formed on the substrate, an adhesive layer 3, and a cover glass 4, and on the cover glass 4, an alignment film or a transparent electrode. Etc. are formed. The resin for forming the microlens 2 and the adhesive layer 3 has a heat resistance temperature of 150 ° C. or higher that can withstand the heat treatment process for forming the alignment film or the like, and the numerical aperture of the microlens 2 is 0.1 or more. Refractive Index Difference Δn of Resin Filling 0.1 is selected.

Thereby, the deterioration of resin in the heat treatment process, the peeling of the microlens 2, etc. are prevented, and the liquid crystal display element with a bright screen of high quality and high reliability is obtained.

Description

Microlens substrate, liquid crystal display element and liquid crystal projector device using same

1 is a cross-sectional view for explaining the structure of a liquid crystal display device showing an embodiment of the present invention.

2 is an explanatory diagram for illustrating a manufacturing process of a stamper used in the 2P method.

3 is an explanatory diagram for explaining a manufacturing process of a microlens array using a stamper.

FIG. 4 is a cross-sectional view of a main portion for explaining a hemispherical (spherical) microlens in a microlens substrate provided in the liquid crystal display element. FIG.

5 is an explanatory diagram showing a main configuration of a liquid crystal projector device using the liquid crystal display element.

6 is an explanatory diagram showing an overall configuration of a liquid crystal projector device using the liquid crystal display element.

* Description of the symbols for the main parts of the drawings *

1: transparent substrate (first transparent substrate), 2: microlens,

2 ': lens portion, 3: adhesive layer (adhesive),

4: cover glass (second transparent substrate), 5: real,

6: liquid crystal layer, 7: transparent substrate,

9: counter substrate of liquid crystal display element, 10: liquid crystal display element,

11 substrate, 12 electron beam resist,

13: microlens array disk, 14: stamper,

15: transparent substrate, 16: ultraviolet photosensitive resin,

17: white light source, 18: UV-IR filter,

19a: dichroic mirror, 19b: dichroic mirror,

20a: reflector, 20b: reflector,

21a: liquid crystal display element, 21b: liquid crystal display element,

21c: liquid crystal display element, 23a: dichroic mirror,

23b: dichroic mirror, 24: projection lens,

25 optical system, 26 liquid crystal display element driving circuit,

28: screen.

The present invention relates to a microlens substrate on which microlenses are formed, a high definition liquid crystal display element using the same, and a liquid crystal projector device using the liquid crystal display element.

In the present specification, the microlens refers to a microlens having a size of about several millimeters or less, and includes a microlens array in which such microlenses are arranged in one or two dimensions, and a plurality of lenticular lenses arranged in a plurality. Shall be.

The liquid crystal display element is increasing not only as a direct view type but also as a projection display element such as a projection television. When the liquid crystal display element is used as the projection type, roughness of the screen is noticeable when the magnification is increased by the conventional fractional number. It is necessary to increase the number of pixels in order to obtain fine pixels even at high magnification. However, when the number of times of the liquid crystal display element is increased, the area occupied by the portions other than the element in the active matrix type liquid crystal display element is relatively large, so that the area of the black matrix covering these portions is increased. When the area of the black matrix increases, the area of the recovery openings that contribute to display decreases, and the aperture ratio of the display element decreases. When the aperture ratio is lowered, the screen is darkened to deteriorate the image quality.

In order to prevent the fall of the aperture ratio by the increase of such a small number, it is proposed to form a microlens on one side of a liquid crystal display element (JP-A-60-165621-165624, JP-A-60-262131). Reference). By providing a plurality of microlenses corresponding to each element, it is possible to condense light, which has conventionally been shielded by the black matrix, in the element.

In addition to the above applications, the microlenses are used for condensing means for optical pickup such as laser disks, compact discs, magneto-optical disks, condensing means for coupling with light receiving elements, solid-state imaging devices such as CCDs, or sensitivity of one-dimensional image sensors used in facsimile. Condensing means or imaging means for condensing incident light in a light-generating conversion region (see Japanese Patent Application Laid-Open Nos. 54-17620 and 57-180), to form an image to be recognized in a liquid crystal printer or an LED printer. It is used as an imaging means (see Japanese Patent Application Laid-Open No. 63-44624), a filter for processing optical information, and the like. As described above, the microlenses are used in combination with various optical elements or optical components in optical devices. Ion-exchange method (Appl optics, 21 (6) P. 1052 (1982), Electron Lett., 17P, 452 (1981), swelling method (new manufacturing method of plastic microlens including Suzuki et al. Study group), thermal hydrolysis (Zoran D. Popovic et al. Appl. Optics. 27 P. 1281 (1988)), and machining.

By ion exchange, a microlens having a refractive index distribution type is obtained, and a microlens having a hemispherical or rotating object (aspherical) refractive surface is obtained by other methods. In the case of a hemispherical microlens, this is used as a master (disk), and molding using this master makes mass production of microlenses possible (see 2P method, Japanese Patent Laid-Open No. 5-134103). By attaching these microlenses to the crystal display element, the effective aperture ratio of the liquid crystal display element is improved and a bright display screen is obtained. In addition, the said effective aperture ratio means the transmittance | permeability of the liquid crystal display element except a color filter and a polarizing plate.

By the way, in the liquid crystal display element for projection type television which shows high-definition display of the pitch of several tens of micrometers, the opening area of a display element is reduced again and there exists a limit to the improvement of an effective aperture ratio. This is because the effective aperture ratio is determined by the magnitude relationship between the size of the condensation spot of the microlens and the area of the recovery aperture.

The diameter D of the condensing spot is D = 2 · f · tan θ ·· ① when the divergence degree (half-degree angle) of incident light is θ and the focal length of the microlens is f. When the area of the condensing spot is larger than the area of the recovery opening, light that does not enter the recovery opening does not contribute to display, and the effect of improving the effective aperture ratio is reduced.

In order to enhance the condensing effect, it is considered to reduce the divergence degree θ of incident light and to shorten the focal length f of the microlens. Among these, the divergence degree θ of incident light is smaller as the light emitting area of the light source used is smaller and the distance from the light source to the liquid crystal display element is smaller. However, in order to secure long life and the brightness required for display at the light source technology level of development, It is difficult to do. Therefore, it is necessary to shorten the focal length f of the microlens and to approach the focal point of the microlens so as to be located near the recovery opening of the liquid crystal display element.

In the current manufacturing technology of the liquid crystal display device, a device having a pitch of 50 µm and a side of the recovery opening of about 30 µm is manufactured. In the liquid crystal display element of this size, when the divergence degree θ of the illumination light is 5 °, the focal length f must be 170 μm or less in the above formula in order for the diameter D of the condensing spot to be 30 μmØ. Since the light condensing amount of the microlens is proportional to its area, it is maximized when the microlens is covered at the same pitch as the pitch pitch, that is, when the diameter of the microlens is equal to the pitch pitch P, and the numerical aperture NA of the microlens at this time is = p / (2f) = 0.147. As shown in this example, in a high-definition liquid crystal display device having a repetitive pitch P of several tens of micrometers, it is preferable that the value of the numerical aperture for reducing the condensing spot of the microlenses is at least 0.1 or more.

By the way, in the above-described microlenses, a glass having a thickness of about 250 μm (the value obtained by multiplying the refractive index of glass) corresponding to a focal length of 170 μm in air is sandwiched between the glasses, and the focal point is set so as to be located in the recovery opening of the liquid crystal display element. You must.

In order to realize such a configuration, a liquid crystal display device may be prepared using a glass substrate having a thickness of 250 µm as one substrate, and then a microlens may be attached thereafter. However, in this method, the handling of a very thin glass substrate having a thickness of 250 µm is considered. It is difficult and not suitable for mass production. Therefore, a technique for short focusing of a microlens replaced with this is disclosed in Japanese Patent Laid-Open No. 3-248125.

In this method, a cover glass or film having a thickness corresponding to the focal length is adhered to the surface of the microlens, and the microlens is made in one substrate of the liquid crystal display element. Further, according to Japanese Patent Laid-Open No. 3-233417, a 2P method is used to form a lens-shaped portion on a lens substrate with a photosensitive resin, and mass production by adhering a cover glass having a thermal expansion coefficient such as microlenses with an adhesive of a different refractive index. Disclosed is a method of improving performance and adhesion.

However, in the technique in which the microlenses are made in advance on the substrate constituting the liquid crystal display element in this way, it is not necessary to handle very thin glass substrates, but the microlenses are made by attaching the cover glass and then on the substrate (that is, the cover). Since a transparent electrode, an alignment film, or a black matrix must be formed on the glass, if necessary, microlens materials and adhesives are deteriorated, resulting in a decrease in transparency or other problems that the lens itself is peeled off from glass. It is hard to say that this is improved. That is, in the process of forming a transparent electrode, an alignment film, a black matrix, or the like on a conventional glass substrate, all of the processes are performed at a high temperature of 150 ° C or higher, and generally around 200 ° C. In this heat treatment step, a pair of substrates were attached (i.e., after the heat treatment process), but there was no problem in attaching the microlenses to one substrate. When the heat treatment step is performed, the heat resistance is not considered in the microlens material or the adhesive, which causes defects such as deterioration and peeling as described above. In order to avoid such a problem, it is also considered to lower the heating temperature at the time of forming the transparent electrode, the alignment film, the black matrix or the like, but this causes a decrease in the adhesion of the film and a decrease in the non-direction of the liquid crystal. Since the deterioration of the reliability of each display device, such as a display element and the liquid crystal projector device using the same, deterioration of a display quality, etc. will arise, this method cannot be employ | adopted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above process, and its object is to form a microlens substrate having microlenses excellent in heat resistance and a short focal length, and furthermore, by using this microlens substrate, high quality. The present invention provides a liquid crystal display and a high performance liquid crystal projector device having a bright screen with high reliability.

In the microlens substrate according to claim 1 of the present invention, a microlens array or lenticular lens formed on a first transparent substrate and a second transparent substrate are pasted with an adhesive to solve the above problems. Or each of the lenticular lens and the adhesive is made of a material having heat resistance of 150 ° C or higher.

The microlens substrate according to claim 3 of the present invention is characterized in that the numerical aperture of the microlens array or lenticular lens is 0.1 or more in the microlens substrate according to claim 1 to solve the above problems.

In the microlens substrate according to claim 4 of the present invention, in order to solve the above problems, in the microlens substrate according to claim 1, the refractive index difference Δn between the microlens array or the lenticular lens and the adhesive is 0.1 or more. have.

In the liquid crystal display device according to claim 6 of the present invention, in order to solve the above problems, the microlens substrate of claim 1, 3 or 4 becomes an opposing substrate, and a transparent electrode, an alignment film, and, if necessary, black on the opposing substrate. The matrix is formed, and is formed by being attached to an active matrix substrate. The liquid crystal projector device according to claim 11 of the present invention is characterized in that the liquid crystal display device according to claim 6 is used to solve the above problems. According to the structure of claim 1, the microlens array or the lenticular lens (hereinafter referred to collectively as microlenses) and the adhesive are each made of a material having a heat resistance of 150 ° C. or higher, thereby providing a microlens substrate excellent in heat resistance. Thus, various processing can be performed under high heat. In addition, the microlens substrate has a structure in which a second transparent substrate (for example, cover glass) is attached to the microlens (for example, heat-resistant resin) formed on the first transparent substrate by an adhesive. The focal length of the microlenses can be shortened as compared with forming the formed microlenses by attaching them to a predetermined substrate in a later step. As a result, it is possible to obtain a microlens substrate having a short focal length that is excellent in heat resistance and can be subjected to various processing under high heat.

Thus, for example, a liquid crystal display device fabricated by using the microlens substrate as an opposing substrate as in the configuration of claim 4, forming a transparent electrode, an alignment film, a black matrix, etc., if necessary, and attaching the active matrix substrate to each other. In spite of the heat treatment process of 150 ° C. or higher forming a transparent electrode, an alignment film, a black matrix, or the like, the adhesive or the microlens material is not deteriorated and the transparency is not degraded or the microlens is peeled off the second transparent substrate. High quality with the same manufacturing process. It is possible to obtain a liquid crystal display device having a bright screen with high reliability.

According to the configuration of claim 3, since the numerical aperture of the microlens in the microlens substrate is 0.1 or more, it is generally necessary to increase the numerical aperture of the lens in order to reduce the condensing spot of the microlens as described above in the prior art. It is preferable that the value is at least 0.1 or higher ”, and the microlens substrate can be filled. Therefore, for example, the liquid crystal produced using the microlens substrate as in the configuration of claim 6 The display element is a high-definition liquid crystal display element whose elementary pitch is about several tens of micrometers.

According to the structure of Claim 4, since the refractive index difference (DELTA) n between a microlens and an adhesive agent in the said microlens board | substrate is 0.1 or more, in this also, in order to make small the condensing spot of a microlens mentioned above, the numerical aperture of a lens is generally It is better to increase the value, and the value thereof is preferably at least 0.1. &Quot;" That is, if the radius of the microlens is R, the focal length is f, and the refractive index difference between the microlens and the adhesive is Δn, the numerical aperture of the lens is approximately expressed as R / f, so R / f It becomes 0.1 condition. On the other hand, in geometric optics, the relationship of R = 4n · f holds between these three variables. Therefore, the condition in "..." mentioned above is Δn It can be written back to 0.1. Therefore, for example, the liquid crystal display element manufactured using this microlens board | substrate like the structure of Claim 6 turns into a high-definition liquid crystal display element of about tens of micrometers with a pitch pitch.

According to the structure of claim 11, the liquid crystal projector device is constructed by using the liquid crystal display element constructed by using the microlens substrate according to claim 1, whereby a liquid crystal projector device of high quality, high reliability and a bright projection image can be obtained. Further, since the liquid crystal projector device is constructed by using the liquid crystal display element constructed using the microlens substrate according to claim 3 or 4, it is possible to obtain a liquid crystal projector device of high quality, high reliability, and bright and high definition projection image.

According to the structure of the foreign application claim 16, since the numerical aperture of the projection lens is larger than the numerical aperture of the microlens array or the lenticular lens, the loss of light in the projection lens can be reliably reduced, and the projection is very bright on the screen. The image is displayed.

EXAMPLE

An embodiment of the present invention will be described with reference to FIGS. 1 to 2 as follows. In the present embodiment, the microlens substrate of the present invention is used as an opposing substrate of the liquid crystal display device. The microlens substrate of the present invention is not limited to the present embodiment. Of course, it can be used in various fields.

The liquid crystal display element according to the present embodiment is an active matrix liquid crystal display element, and has a transparent substrate 7 made of quartz glass as shown in FIG. On this transparent substrate, an illustration electrode, a switching element, a bus wiring, etc., not shown are formed. The liquid crystal layer 6 is enclosed by the actual material 5 between the transparent substrate 7 and the opposing substrate (that is, the microlens substrate of the present invention) 9 facing the substrate.

The counter substrate 9 comprises a transparent substrate (first transparent substrate) 1 made of quartz glass, an adhesive layer 3 made of a microlens 2 and an adhesive, and a cover glass made of quartz glass (second Transparent substrate) 4. The microlens 2 is a so-called microlens array having a plurality of lens portions 2 provided in correspondence with the respective sweep electrodes on the transparent substrate 7. In the present embodiment, the lens portion 2 of the microlens 2 has a hemispherical (spherical) iron lens shape and is manufactured by the above-described 2P method. In the 2P method, a mold of a microlens array called a stamper is first manufactured, and the stamper makes a large quantity of microlens array copies. The following briefly describes the processor based on FIGS. 2 and 3.

First, the manufacturing process of a stamper is demonstrated based on FIG.

(a) The board | substrate 11 is prepared and the electron beam resist 12 is apply | coated on it.

(b) The electron beam resist 12 patterned by electron beam exposure is softened to an iron lens shape, and a microlens array master 13 is produced.

(c) Next, a stamper material such as nickel is deposited on the master 13 by the electroforming method. The stamper 14 is produced.

(d) The stamper 14 and the disk 13 are separated. The stamper 14 has a concave shape corresponding to the convex micro lens array. This is the mold of the microlens array.

Next, a manufacturing process of the microlens array using the stamper 14 will be described with reference to FIG.

(a) A transparent substrate 15 is prepared, and an ultraviolet photosensitive resin (so-called UV curable resin) 16 is injected into the stamper 14.

(b) Next, the injected ultraviolet photosensitive resin 16 is sandwiched between the stamper 14 and the transparent substrate 15 and pressed to enlarge the entire lens surface.

(c) The ultraviolet photosensitive resin 16 is cured by ultraviolet rays transmitted through the transparent substrate 15.

(d) After curing, the transparent substrate 15 is peeled off together with the ultraviolet photosensitive resin 16 by the stamper 14. This peeled thing becomes a product as a microlens array.

On the surface of the cover glass 4 on the side of the liquid crystal layer 6, a transparent electrode, an alignment film, a black matrix and the like not shown are formed. They are all attached to the microlens 2 and the cover glass 4, formed as a microlens substrate, and then formed at a high temperature condition of 150 캜 or higher. Therefore, the microlens 2 and the adhesive layer 3 need heat resistance such that pyrolysis or deformation does not occur even at 150 ° C or higher, and transparency does not decrease.

On the other hand, FIG. 4 shows an enlarged view of the main portion of the lens portion 2 in the microlens 2 formed on the transparent substrate 1. In the figure, n1, n2, n3 (= 1) are the refractive indices of the microlenses 2, the adhesive layer 3, and the air, respectively, and the refractive index difference Δn of the resin is defined as Δn = n1-n2. R is the radius of curvature of the hemispherical lens portion 2 '(i.e., half the length of the lens diameter), and f is the focal length in the air of the lens portion 2'. As described above, in order to reduce the condensing spot diameter, Δn The refractive index of the resin must be selected to be 0.1.

In order to satisfy the above two conditions, in this embodiment, the resin for forming the microlens 2, the adhesive resin for forming the adhesive layer 3, the photosensitive resin UV-4000 (refractive index n = 1.567) made by Daikin Co., Ltd. As the photosensitive resin UV-1000 (refractive rule n = 1.453) made by the company was used.

All of these materials had a thermal decomposition temperature of 150 ° C. or higher, and no thermal decomposition or discoloration occurred even when the transparent electrode or the black matrix was deposited at a high temperature of 150 ° C. or higher.

In addition, a value Δn = 0.114 is obtained from the above equation, and on the basis of this value, the design of the microlens 2 corresponding to the liquid crystal display element having a recovery pitch of 29 μm × 24 μm is obtained according to the configuration of the present embodiment. did. As a result, in the spherical lens portion 2 'having a radius of curvature of 18.8 mu m, the focal length f in air was 165 mu m.

Since the refractive index of quartz is 1.46, the thickness of the cover glass 4 is 240 micrometers. That is, the effective aperture ratio of the liquid crystal display element could be improved by this microlens 2.

As described above, in the liquid crystal display element of this embodiment, the microlens substrate having the resin having heat resistance and the microlens substrate having the adhesive layer 3 are used as the counter substrate 9 of the liquid crystal display element. Even if the heat treatment process of forming an alignment film, a transparent electrode, a black matrix, etc. on (9) is performed, a material does not decompose or deteriorate. Therefore, the liquid crystal display element can be manufactured by the manufacturing process similar to the conventional one (manufacturing conditions), and the reliability of the microlens 2 can be improved, and also the reliability of the liquid crystal display element can be aimed at. .

In addition, since the microlens 2 having a large numerical aperture 2 is mounted through the adhesive layer 3 having a different refractive index, the lens effect is exerted even when the lens portion 2 'and the adhesive layer 3 are in contact with each other. The focal length of the lens 2 is made short, and the condensing power can be increased. As a result, a liquid crystal display device having a bright screen with high quality and high reliability can be obtained.

In addition to the heat resistant resin used in the present embodiment, the resin for forming the microlens 2 as a material having heat resistance of 150 ° C. or higher is photosensitive resin RC-8766 (refractive index n = 1.534) manufactured by Dainippon Ink and Co., Ltd. (Refractive index n = 1.52), UT20 (refractive index n = 1.51), HO2 (refractive index n = 1.63), HV2 (refractive index n = 1.63), and the resin of the adhesive layer 3 was formed by the photosensitive resin HNA-101 (manufactured by Dainippon Ink Corporation). Refractive index n = 1.37), photoresist UV-2000 (refractive index n = 1.4777) manufactured by Daikin Industries Co., Ltd., UV-3000 (refractive index n = 1.498), and the like.

In this embodiment, the transparent substrate 1, the cover glass 4, and the transparent substrate 7 are all made of the same material. This is to prevent the microlens 2 or each substrate from peeling off due to the difference in thermal expansion coefficient. From the viewpoint of productivity, it is preferable to use an ultraviolet photosensitive resin as the resin for forming the microlens 2 and the adhesive layer 3 rather than the thermosetting resin. Moreover, as another Example of this invention, the liquid crystal projector device was produced using the liquid crystal display element of the said Example. In this case, the fine image was obtained by using the liquid crystal display element with a high effective aperture ratio, and the high quality thing was realizable.

Next, the liquid crystal projector using the liquid crystal display element using the microlens substrate of Example 1 will be described in detail with reference to FIG. This liquid crystal projector has the optical system 25 shown in FIG. According to this optical system 25, the irradiation light of white light source 17, such as a metal halide lamp, is guided to the dichroic mirrors 19a and 19b through the UV-IR filter 18. As shown in FIG. In the dichroic mirrors 19a and 19b, incident light is separated into three primary colors of red, green and blue.

For example, it is assumed that only blue light is reflected by the dichroic mirror 19a, and only green light is reflected by the dichroic mirror 19b. In this case, the blue light separated by the dichroic mirror 19a is guided to the liquid crystal display element 21a through the reflecting mirror 20a. Green light and red light transmitted through the dichroic mirror 19a are incident on the dichroic mirror 19b. In the dichroic mirror 19b, only green light is reflected and guided to the liquid crystal display element 21b, while red light is transmitted to the liquid crystal display element 21c. The liquid crystal display elements 21a to 21c include the microlens substrates described in the first embodiment, and display respective primary colors based on the video signal input to the liquid crystal projector. Blue light transmitted through the liquid crystal display element 21a is incident on the dichroic mirror 22a through the field lens 22a. Green light transmitted through the liquid crystal display element 21b is incident on the dichroic mirror 23a through the field lens 22b. The red light transmitted through the liquid crystal display element 21c is incident on the dichroic mirror 23b through the field lens 22c and the reflecting mirror 20b. In the dichroic mirrors 23a and 23b, primary colors of light that respectively pass through the liquid crystal display elements 21a to 21c are synthesized, and then guided to the projection lens 24, and the image is magnified and projected on a screen which will be described later.

In the liquid crystal projector, microlenses having a short focal length are mounted corresponding to each pixel in accordance with the reduction (fixing size) of the pixel size of the liquid crystal display element, so that the light blocked by the black matrix in the conventional high definition liquid crystal display element A light display screen can be obtained by condensing on the pixel openings without wasted by the microlenses.

The light condensed by the microlenses forms a spot and then reaches the projection lens 24 while diverging from the pixel opening at an angle determined by the numerical aperture of the pixel. In order for the projection lens 24 to condense this divergent light with low loss, it is preferable that the focal length f of the projection lens 24 is short and the aperture D of the projection lens 24 is large. Specifically, the value of D / 2f, which is the numerical aperture of the projection lens 24, is preferably larger than the numerical aperture of the microlens. Therefore, using the projection lens 24 having a numerical aperture of 0.1 or more based on the conditions for the numerical aperture of the microlenses described above, the loss of light in the projection lens 24 can be reduced, and the projection is very bright on the screen. The image is displayed.

In the above description, the case where only the blue light is reflected by the dichroic mirror 19a and only the green light is reflected by the dichroic mirror 19b has been described. However, the present invention is not limited thereto. The irradiation light of (17) may be separated into three primary colors of red, green, and blue.

6 is a block diagram showing the overall configuration of a liquid crystal projector. The liquid crystal projector 30 includes the optical system 25, the liquid crystal display element driving circuit 26, the video signal input terminal 27, and the screen 28.

The liquid crystal display element driver circuit 26 receives the video signal input from the video signal input terminal 26, converts it into a drive signal of three primary colors, and outputs it as a drive signal of the liquid crystal display elements 21a to 21c.

The screen 28 is made of a material that transmits light, and the image projected by the projection lens 24 of the optical system 25 is opposite to the optical system 25 with respect to the screen 28, that is, the liquid crystal projector 30. It can be seen from the outside.

The screen is not limited to the case where the screen is configured as part of the liquid crystal projector as in this embodiment, but may be provided outside the liquid crystal projector. In this case, the screen is made of a material that diffuses and reflects light, so that the image can be viewed from the same side where the liquid crystal projector is placed on the screen.

The microlens substrate according to claim 1 of the present invention includes a microlens array or a lenticular lens (hereinafter, collectively referred to as a microlens in the effect column of the present invention) and a second lens formed on the first transparent substrate. A transparent substrate is attached by an adhesive, and each of the microlenses and the adhesive is made of a material having heat resistance of 150 ° C or higher.

Therefore, it becomes a microlens board | substrate excellent in heat resistance, and can implement various processes under high heat | fever, For example, using the board | substrate with which the microlens is previously formed as one board | substrate which comprises a liquid crystal display element, manufacture of a liquid crystal display element Even if the microlens is heated to a high temperature in the process, there is no fear that the microlens material or the adhesive is decomposed or deteriorated, and the liquid crystal display element can be manufactured under the same manufacturing conditions as before.

In addition, the microlens substrate is formed by attaching a second transparent substrate (for example, cover glass) to the microlens (for example, heat resistant resin) formed on the first transparent substrate by an adhesive. In addition, the focal length of the microlenses can be shortened as compared with forming the paste on a predetermined substrate in a later step.

As described above, the microlens substrate according to claim 3 of the present invention has a configuration in which the numerical aperture of the microlens is 0.1 or more in the microlens substrate according to the first aspect.

As described above, the microlens substrate according to claim 4 of the present invention has a structure in which the refractive index difference Δn between the microlens and the adhesive is 0.1 or more in the microlens substrate according to the first aspect. Therefore, it becomes a microlens substrate which can satisfy the condition that "in order to reduce the condensation spot of a microlens, it is generally desirable to enlarge the numerical aperture of a lens, and to set it at least 0.1 or more." By using a microlens substrate, it is possible to produce a high-definition liquid crystal display device having a pixel pitch of several tens of micrometers.

In the liquid crystal display device according to claim 6 of the present invention, the microlens substrate of claim 1, 3, or 4 as described above becomes an opposing substrate, and a transparent electrode, an alignment film, and, if necessary, a black matrix are provided on the opposing substrate. It is formed and attached to an active matrix substrate. In addition, since the microlens substrate has heat resistance, sufficient heating can be performed when forming a transparent electrode, an alignment film and, if necessary, a black matrix on the counter substrate. Therefore, the effect that a liquid crystal display element with a bright screen is achieved by high quality and high reliability is achieved.

The liquid crystal projector device according to claim 11 of the present invention is a configuration in which the liquid crystal display element according to claim 6 is used as described above.

Therefore, the effect that a liquid crystal projector device of high quality and high reliability and a bright projection image can be realized is achieved.

The liquid crystal projector device according to the foreign application claim 16 of the present invention uses the liquid crystal display device according to claim 6, and includes a projection lens for condensing the transmitted light of the liquid crystal display device and projecting it on a screen, and the numerical aperture of the projection lens It is larger than the numerical aperture of the said microlens or a lenticular lens.

Therefore, a fine image can be obtained by using the liquid crystal display element with a high effective aperture ratio. In addition, since the numerical aperture of the projection lens is larger than the numerical aperture of the microlens array or the lenticular lens, it is possible to reliably reduce the loss of light in the projection lens and to display an extremely bright projection image on the screen. Reap also

Claims (16)

1. A first transparent substrate and a material arranged in an array shape on the first transparent substrate and having heat resistance of 150 ° C. or higher, and collecting incident light, a second transparent substrate provided on the light collecting member, and 150 A microlens substrate comprising a bonding member for bonding the light collecting member and the second transparent substrate to each other. The microlens substrate of claim 1, wherein the light collecting member is a microlens array or a lenticular lens. The microlens substrate according to claim 2, wherein the microlens array or the lenticular lens has a numerical aperture of 0.1 or more. The microlens substrate according to claim 2, wherein a difference in refractive index between the microlens array or the lenticular lens and the adhesive member is 0.1 or more. The microlens substrate of claim 1, wherein the light collecting member and the adhesive member are made of an ultraviolet photosensitive resin. A liquid crystal display device comprising: (a) a first transparent substrate, (b) a light collecting member formed of an array shape on the first transparent substrate and having a heat resistance of 150 DEG C or more, and condensing incident light; c) a second transparent substrate provided on the light collecting member, and (d) an opposite substrate made of a material having heat resistance of 150 ° C. or higher, and having an adhesive member for adhering the light collecting member and the second transparent substrate to each other. A transparent electrode, an alignment film, and a black matrix are provided on the opposing substrate, and the liquid crystal display element further includes an active matrix substrate and a liquid crystal layer provided between the opposing substrate and the active matrix substrate. Display elements. The liquid crystal display of claim 6, wherein the first transparent substrate, the second transparent substrate, and the active matrix substrate are all made of the same material. The liquid crystal display of claim 6, wherein the light collecting member and the adhesive member are made of an ultraviolet photosensitive resin. The liquid crystal display of claim 6, wherein the light collecting member is a microlens array or a lenticular lens having a numerical aperture of 0.1 or more. The liquid crystal device of claim 6, wherein the light collecting member is a microlens array or a lenticular lens having a difference in refractive index from the adhesive member of 0.1 or more. A liquid crystal projector device comprising: (a) a first transparent substrate, a condenser member formed of an array shape on the first transparent substrate and having a heat resistance of 150 ° C. or higher and condensing incident light; And a counter substrate comprising a second transparent substrate provided on the substrate and a heat-resistant material having a heat resistance of 150 ° C. or higher, and having an adhesive member for adhering the light collecting member and the second transparent substrate to each other, wherein the counter substrate includes a transparent electrode, an alignment film, and a black substrate. A matrix is provided, further comprising (b) an active matrix substrate, and (c) a liquid crystal display element having a liquid crystal layer provided between the counter substrate and the active matrix substrate. LCD projector device. 12. The liquid crystal projector device according to claim 11, wherein the light collecting member and the adhesive member are made of an ultraviolet photosensitive resin. The liquid crystal projector device according to claim 11, wherein the light collecting member is a microlens array or a lenticular lens having a numerical aperture of 0.1 or more. 12. The liquid crystal projector device according to claim 11, wherein the light collecting member is a microlens array or a lenticular lens having a difference in refractive index from the adhesive member of 0.1 or more. A step of preparing a first transparent substrate, a step of arranging a light collecting means for collecting incident light in an array shape on a first transparent substrate, comprising a material having heat resistance of 150 ° C. or higher, and preparing a second transparent substrate And an adhesive member made of a material having a heat resistance of 150 ° C. or higher, and the step of attaching the light collecting means and the second transparent substrate to each other, and providing a transparent electrode, an alignment film, and a black matrix on the second transparent substrate at a temperature of 150 ° C. or higher. A method of manufacturing a microlens substrate, comprising the step of: a. 12. The projection lens according to claim 11, further comprising a projection lens for condensing the transmitted light of said liquid crystal display element and projecting it on a screen forming a part of said liquid crystal projector device or a screen provided outside of said liquid crystal projector device. The numerical aperture of the liquid crystal projector device, characterized in that larger than the numerical aperture of the microlens array or the lenticular lens.