JP2000180609A - Reflection preventive member and image display device equipped with the reflection preventive member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection preventive member capable of equipping the screens of image display devices of various sorts more simply with a reflection preventing function and also an image displaying device furnished with the reflection preventive member. SOLUTION: A pair of transparent base films 2 and 3 are installed opposingly, and a number of projections 5 having curved surface are formed on the front surface of the base film 2, while a number of recesses 6 having curved surface are formed on the rear surface of the base film 3, wherein the optical axes of the projections 5 are positioned identical to the optical axes of their corresponding recesses 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display (L).
CD), plasma display (PDP), electroluminescence display (ELP), flat panel (flat panel) display such as electrochromic display (ECD), and display such as cathode ray tube (CRT) The present invention also relates to an anti-reflection member which is adhered on the screen of these image display devices to prevent reflection or reflection of external light and to make the screen easy to see, and to an image display device having the same.

[0002]

2. Description of the Related Art Conventionally, as an image display device for displaying visual information in a personal computer, a word processor or the like, a liquid crystal display device (LCD), a plasma display device (PDP), an electroluminescence display device (EL)
P), etc., and a display device using a cathode ray tube (CRT). In these display devices, particularly flat display devices, there are remarkable developments such as reduction in thickness, increase in size, higher definition, and full color. By the way, in the case of a liquid crystal display device, there is a fundamental problem that the contrast ratio of an image changes greatly when the viewing angle with respect to the screen is changed, and in order to obtain a high-quality screen display, from the front (the normal direction of the screen). It is desirable to see. However, in practical use, the screen is often viewed from slightly obliquely forward rather than directly in front, and in this case, the image becomes difficult to see and the problem of a narrow viewing angle becomes prominent. Therefore, various measures for widening the viewing angle have been taken.

In addition to the problem of the viewing angle, sunlight incident from the outdoors and illumination light from various indoor lighting fixtures are projected on the screen, and these lights are reflected on the screen.
Alternatively, there is a problem that the image on the user side is reflected on the screen, making it difficult to see the image. Therefore, on the screens of these image display devices, projection of external light such as sunlight or illumination light onto the screen, reflection on the screen, and prevention of reflection of the external image are prevented, so that the image on the screen is more visible. Etc.
It is required to add a function for improving visibility on a screen.

Conventionally, the following various antireflection methods have been used as methods for preventing external light from projecting onto a screen, reflecting on the screen, and reflecting an external image in a liquid crystal display device. . (1) Optical particles (filler) with high light absorption in resin
A method in which an antireflection material in which is dispersed is applied on a screen, and an antireflection treatment of the screen is performed. In this method, the brightness and luminance of the screen are determined by changing the light absorption and mixing ratio of the optical particles. (2) A method of providing a light diffusion function to the screen itself by arranging a large number of microlenses over the entire screen. (3) A method in which the entire surface of the screen is lightly etched to roughen (matte) the surface and diffusely reflect light. (4) A method of attaching an anti-reflection plate having a roughened surface of a resin plate having high (or transparent) light transmittance to a screen.

[0005]

However, when the above-mentioned conventional anti-reflection methods (1) to (4) are applied to a liquid crystal display device, the operation efficiency is generally low regardless of which method is used. There is a problem that productivity in the manufacturing process is reduced, and it is difficult to reduce the manufacturing cost. For example,
A lot of time is required for surface treatment and assembly (arrangement) such as applying an anti-reflective material on the screen, etching the entire surface of the screen, and roughening the surface of the resin plate attached to the screen. This leads to a decrease in productivity in the manufacturing process and an increase in manufacturing cost.

Further, in these methods, it is necessary to secure the visibility of the image itself displayed on the screen while reducing the reflection on the screen, so that both the reduction of the reflection and the visibility of the image are required. Is required to be able to be simultaneously and appropriately controlled, but none of the methods is satisfactory in terms of this controllability. In recent years, in addition to conventional applications, liquid crystal display devices have been increasingly applied to portable mobile terminals and the like that serve as input terminals for large computers, and may be used in more severe environments. It has been increasingly required to provide a screen with excellent visibility even under various use environments.

On the other hand, in a display device other than a liquid crystal display device, for example, a television or a display using a cathode ray tube, since the surface of the cathode ray tube is spherical, external light is projected onto the screen or reflected on the screen. And the reflection of external images cannot be avoided, and these problems have been problems to be solved for many years. At present, it is common to mount an anti-reflection plate with a roughened surface of a resin plate with a high light transmittance close to the front of the cathode ray tube. The point that it takes time is the same as that of the liquid crystal display device.

Further, if the above-described antireflection methods (1) to (3) are applied to a cathode ray tube, various problems are caused, which is not preferable. Therefore, it has been desired to provide a method that can more easily provide an anti-reflection function to the screens of various types of image display devices.

The present invention has been made in view of the above circumstances, and an anti-reflection member capable of more easily providing an anti-reflection function to the screen of various image display devices, and an image display having the same. It is intended to provide a device.

[0010]

In order to solve the above-mentioned problems, the present invention provides the following anti-reflection member and an image display device having the same. That is, in the antireflection member according to the first aspect, a pair of transparent film substrates are arranged to face each other, and a large number of convex portions having a curved surface are formed on one outer surface of these film substrates. In addition, a number of concave portions having a curved surface are formed on the other outer surface, and the optical axis of each of the convex portions coincides with the optical axis of the concave portion corresponding to each of the convex portions. It is characterized by becoming.

The anti-reflection member according to the second aspect is the first aspect.
In the anti-reflection member described above, the pair of film bases are arranged close to each other so that light transmitted through the film bases does not interfere with each other.

According to a third aspect of the present invention, there is provided an anti-reflection member, wherein a plurality of convex portions having a curved surface are formed on one surface of a transparent plate-shaped substrate, and the curved surface is formed on the other surface. Are formed, and the optical axis of each of the convex portions is coincident with the optical axis of the concave portion corresponding to each of these convex portions.

According to a fourth aspect of the present invention, in the antireflection member according to the first, second or third aspect, the height of each of the plurality of convex portions and the pitch between adjacent convex portions are irregularly arranged. In addition, the depth of each of the plurality of recesses and the pitch between adjacent recesses are irregularly arranged.

The antireflection member according to the fifth aspect is the first aspect.
5. The anti-reflection member according to any one of to 4,
The curvature radius of the convex portion and the curvature radius of the concave portion coincide with each other.

[0015] The image display device according to the sixth aspect is the first aspect.
6. An anti-reflection member according to any one of claims 1 to 5.

In the anti-reflection member according to the first or second aspect of the present invention, when external light or light of an external image is incident on each convex portion of one of the film substrates, this light is close to the apex of the convex portion. After being refracted by the surface, the light is transmitted through the film substrate, while being scattered in a direction along the surface at the periphery of the projection. As a result, the incident external light or external image light is partially scattered outward by a large number of convex portions formed on the surface of the film substrate, and the remaining portion is transmitted through the film substrate. Become.

Since this scattered light is scattered outward from each of the large number of projections, the amount of scattered light per unit area is very small, and the light reflected in the direction of the eyes of the user. Becomes extremely small. Thereafter, the light transmitted through the film base is refracted by a large number of recesses formed on the outer surface of the film base after passing through the other film base, and then emitted outward.

When light from a liquid crystal display device or the like enters each concave portion of the other film substrate, the light spreads after being refracted by the concave portion. The spread light is incident on and transmitted through the one film substrate, and is refracted and condensed by a number of convex portions formed on the surface of the film substrate, and is emitted outward.
Here, by arranging these light beams transmitted through the film substrate so as not to interfere with each other, the occurrence of moire image interference fringes and the like is prevented.

In the anti-reflection member according to the third aspect, when external light or light of an external image is incident on each convex portion of the plate-like base material, this light is refracted on the surface near the apex of the convex portion and thereafter. The light is transmitted through the plate-shaped base material, and is scattered in a direction along the surface at the periphery of the projection. As a result, part of the incident external light or light of the external image is scattered outward by the large number of convex portions, and the remaining light is transmitted through the plate-shaped base material. Since this scattered light is scattered outward from each of the large number of convex portions, the amount of scattered light per unit area becomes very small, and the ratio of light reflected in the direction of the user's eyes is reduced. Extremely low. Thereafter, the light transmitted through the plate-shaped base material is refracted by a large number of concave portions formed on the outer surface and then emitted outward.

Further, when light from a liquid crystal display device or the like enters each concave portion of the plate-shaped base material, this light is refracted by the concave portion and spreads. This spread light passes through the plate-shaped substrate,
It is refracted and condensed by a number of protrusions formed on its surface,
Radiated outward. As described above, by attaching the anti-reflection member according to the first, second or third aspect of the present invention to the screen of an arbitrary image display device, projection and reflection of external light on the screen surface and reflection of the external image are reduced. This makes it possible to improve the visibility of the image display device.

In the anti-reflection member according to the fourth aspect, the height of each of the plurality of projections and the pitch between adjacent projections are irregularly arranged, and the depth of each of the plurality of depressions and the adjacent recesses. By arranging the pitch between them irregularly, the direction in which the external light and the light of the external image are scattered and the amount of scattered light in each of the plurality of convex portions become irregular (random). The projection and reflection of light and the reflection of an external image can be further reduced, and the visibility of the image display device is further improved.

In the antireflection member according to the fifth aspect, the curvature radius of the convex portion and the curvature radius of the concave portion are matched to keep the traveling directions of light before and after transmission through the antireflection member in parallel. .

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the antireflection member of the present invention will be described with reference to the drawings. [First Embodiment] FIG. 1 is a sectional view showing an antireflection film according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the same. The antireflection film 1 has a maximum thickness of, for example, 10
0μm transparent base film (film base)
2 and 3 are opposed to each other, and the front surface (outer surface) of the base film 2 has a convex portion 5 whose surface forms a part of a spherical surface having a radius of curvature r ₁ of approximately 150 μm and whose height up to the vertex is approximately 2 μm. Are formed in large numbers.

.. Have a pitch t ₁ of 6
In the rows adjacent to each other and arranged in a horizontal row at an interval of 0 μm, the protrusions 5 in one row are replaced with the protrusions 5 in the other row.
It is arranged so that it may be located in the middle of. The height of the apex of the convex portion 5 is set to be 1/30 about the pitch t _1. The height of each of the protrusions 5 may be, for example, randomly formed in a range of 1 to 3 μm. Further, it is desirable that the pitch t ₁ between the adjacent convex portions 5 is smaller than the pitch of the pixels of the image display device to which the antireflection film 1 is attached.

On the other hand, on the back surface (outer surface) of the base film 3, the surface thereof forms a part of a spherical surface having a radius of curvature r ₂ of about 120 μm at a position corresponding to each of the projections 5 and has a depth at the center bottom. A large number of recesses 6 having a size of about 3.2 μm are formed. The pitch t ₁ and the arrangement of these recesses 6, 6,... Are exactly the same as those of the above-described protrusion 5, and the depth of the central bottom of the recess 6 is about 1/20 of the pitch t ₁ . Is set.

The optical axis of each concave portion 6 coincides with the optical axis of the corresponding convex portion 5. The depth of the central bottom of each of the recesses 6 may be randomly formed in a range of, for example, 2 to 4 μm. Here, when parallel light cannot be obtained due to the influence of the base films 2 and 3 and the adhesive, the combination of the convex portions 5 and the concave portions 6 having different polar radii is optimized in order to obtain parallel light. When there is no possibility that such a problem may occur, each of the protrusions 5 may be used.
In this case, the radius of curvature of each concave portion 6 may be the same.

The base films 2 and 3 are made of a polymer film having high light transmittance and excellent heat resistance and impact resistance. As the polymer film, a polycarbonate resin film, an acrylic resin film or the like is suitably used. The base films 2 and 3 are arranged close to each other so that light transmitted therethrough does not cause moire image interference fringes or the like, for example, so that the gap is about 40 μm. Are fixed to each other by an adhesive or the like. In addition, instead of the adhesive, a method of fitting and fixing the frame to the frame is also adopted.

An adhesive for applying the antireflection film 1 to a screen of an image display device is applied to a boundary portion between the concave portions 6 on the back surface of the base film 3. The adhesive may be a material that does not affect the refractive index of light, for example, a material having a refractive index very close to the base films 2 and 3, and an adhesive such as an acrylic adhesive is preferably used. .

Next, a super-twisted nemati (STN: super-twisted nemati) having the above-described antireflection film 1 is provided.
c) A reflection type liquid crystal display device of a liquid crystal system will be described with reference to FIG. This reflection type liquid crystal display device 11 has the STN
The liquid crystal layer 12 and an upper glass substrate 13 and a lower glass substrate 14 which are disposed to face each other with the STN liquid crystal layer 12 therebetween constitute an STN type liquid crystal cell 15.
On the upper surface of 5, a retardation plate 16 and an upper polarizing plate 17 made of a polycarbonate resin, a polyacrylate resin or the like are sequentially provided.

On the upper polarizing plate 17, the antireflection film 1 is adhered and fixed by an adhesive 7 applied to the back surface of the base film 3. Also,
A lower polarizing plate 18 is provided on the lower surface of the liquid crystal cell 15, and a reflecting plate 19 is mounted on the lower surface of the lower polarizing plate 18 so that the uneven surface thereof faces the lower surface of the lower polarizing plate 18. A pressure-sensitive adhesive 20 is filled between the light-reflection plate 19 and the reflection plate 19.

On the opposing surfaces of the upper glass substrate 13 and the lower glass substrate 4, a transparent electrode 2 made of indium tin oxide (ITO) or the like is provided.
1 and 22 are formed respectively, and alignment films 23 and 24 made of polyimide resin or the like are formed on the opposing surfaces of the transparent electrodes 21 and 22, respectively.
Is sealed in a region formed between the alignment films 23 and 24,
The light passing through the liquid crystal cell 15 rotates by a predetermined angle (rotation) along the twist of the STN liquid crystal.

Next, the operation of the antireflection film 1 will be described with reference to FIGS. As shown in FIG. 4, incident light L <b> ₁ composed of external light or an external image such as sunlight or illumination enters the front surface of the antireflection film 1, that is, the convex portion 5 on the front surface of the base film 2 from an oblique direction. Then, near the apex of the convex portion 5, the incident light L ₁ is refracted on the surface and condenses after transmitting through the base film 2. On the other hand, at the periphery of the convex portion 5 is scattered in a direction along its surface is reflected by the surface of the convex portion 5 to the angle of incidence of the incident light L ₁ increases.

As a result, a part of the incident light L ₁ is transmitted through the base film 2 and condensed after being refracted by a number of convex portions 5 formed on the base film 2, and the remainder is the surface of the convex portion 5. And is scattered in a direction along its surface.
Further, the performance can be further improved by applying an anti-reflection coating to the surface of the projection 5. The scattered light L ₂ is reflected by each of the large number of protrusions 5 and then scattered so as to spread outward. Therefore, the amount of scattered light L ₂ per unit area is very small, and _Two
Of these, the proportion of light that enters the user's eyes is extremely small. Meanwhile, the light transmitted through the base film 2, after being modified refracted parallel light by the plurality of depressions 6 formed on the back after passing through the base film 3, toward the outside as a transmitted light L ₃ emitted Is done.

As shown in FIG. 5, light L ₄ (reflected light in a reflection type liquid crystal display device, transmitted light in a transmission type liquid crystal display device) is provided on the back surface of the antireflection film 1, that is, on the concave portion 6 of the base film 3. Is incident, the light L ₄ is scattered after being refracted by the concave portion 6. The light L ₄ of the diffuse light is transmitted is incident on the base film 2, it is condensed by refraction in a number of protrusions 5 at its surface, after being corrected into parallel light, is radiated toward the outside.

As described above, according to the antireflection film 1 of the present embodiment, the transparent base films 2 and 3 are arranged to face each other with the spacer 4 interposed therebetween, and the front surface of the base film 2 has a spherical surface. A large number of convex portions 5 forming a part are formed, and a large number of concave portions 6 whose surface forms a part of a spherical surface are formed at positions corresponding to the respective convex portions 5 on the back surface of the base film 3. Since the axis and the optical axis of the concave portion 6 coincide with each other, the antireflection film 1 is attached to the screens of various image display devices, so that the projection and reflection of external light on the screen surface and the reflection of the external image can be prevented. This can greatly reduce the size compared to the related art, and can improve the visibility of the image display device.

In order to attach the anti-reflection film 1 to the screen of the image display device, the adhesive 7 applied to the back surface of the base film 3 may be simply attached to the screen. Installation work can be simplified. Therefore, as in the conventional anti-reflection method, surface treatment work such as applying an anti-reflection material on the screen, etching the entire surface of the screen, or roughening the surface of the resin plate attached to the screen. Becomes unnecessary, the productivity in the manufacturing process can be improved, and the manufacturing cost can be reduced.

It is also possible to combine the base films 2 and 3 with their front and back surfaces reversed so that the convex portions 5 of the base film 2 and the concave portions 6 of the base film 3 are reversed.

[Second Embodiment] FIG. 6 is a sectional view showing an antireflection film according to a second embodiment of the present invention. This anti-reflection film 31 is different from the anti-reflection film 1 of the first embodiment described above in that the anti-reflection film 1 of the first embodiment has a curvature radius r ₁ of 15
The curvature radii r ₂ of the concave portion 6 are about 120 μm and the respective radii of curvature are different from each other. On the other hand, in the antireflection film 31 of the present embodiment, the curvature radius r of the projection 5 of the base film 2 is different. ₁ and the curvature radius r ₂ of the recess 6 of the base film 3 lies in that to match each other. Here, the curvature radius r ₁ of the convex portion 5 and the concave portion 6
Have a radius of curvature r ₂ of 140 μm. Further, as a countermeasure against rainbow of reflected light (prevention of light interference), the pitch of the projections 5 is not equal pitch but random pitch, and the central axis of the concave portion 6 is aligned with the central axis of the convex portion 5.

The method of attaching and fixing the anti-reflection film 31 to the screen of the image display device is exactly the same as that of the anti-reflection film 1 of the first embodiment. In the antireflection film 31, as shown in FIG. 7, the front surface of the protruding portion 5 of the base film 2, the incident light L ₁ formed of outside light or outside image like sunlight or illumination or the like is incident from an oblique direction, in the vicinity of the apex of the convex portion 5 transmits to condensing the base film 2 after the incident light L ₁ is refracted at the surface. On the other hand, the incident light L ₁ is scattered in a direction along its surface is reflected by the surface of the convex portion 5 becomes scattered light L ₂ at the periphery of the convex portion 5.

On the other hand, the light transmitted through the base film 2 is
After passing through the base film 3, the light is refracted by the concave portion 6 to become transmitted light L ₃ parallel to the incident light L ₁ and emitted outward. In the antireflection film 31, since the radius of curvature r ₂ of the curvature radius r ₁ and the recess 6 of the protrusion 5 so as to coincide with each other, to be held in parallel transmitted light L ₃ with respect to the incident light L ₁ And distortion of the image can be prevented.

[Third Embodiment] FIG. 8 is a sectional view showing an antireflection plate according to a third embodiment of the present invention. This antireflection plate 41 is different from the antireflection film 1 of the first embodiment described above in that the antireflection film 1 of the first embodiment has a pair of transparent base films 2 and 3 opposed to each other. Although a large number of projections 5 whose surface forms part of a spherical surface are formed on the front surface of the base film 2 and a large number of concave portions 6 whose surface forms part of a spherical surface are formed on the back surface of the base film 3. On the other hand, in the antireflection plate 41 of the present embodiment, a large number of convex portions 5 whose surface forms a part of a spherical surface are formed on the front surface of a transparent glass plate (transparent plate-shaped base material) 42 and the rear surface thereof is formed. A large number of concave portions 6 whose surface forms a part of a spherical surface are formed at positions corresponding to the respective convex portions 5.

Here, the radius of curvature r ₁ of the convex portion 5 is 1
The concave portion 6 has a curvature radius r ₂ of about 120 μm. The method of attaching and fixing the anti-reflection plate 41 to the screen of the image display device is exactly the same as that of the anti-reflection films 1 and 31 of the first and second embodiments described above.

According to the anti-reflection plate 41, the projection 5 whose surface forms a part of a spherical surface is provided on the front surface of the transparent glass plate 42.
Are formed, and on the back surface, a large number of concave portions 6 having a surface that forms a part of a spherical surface and having a different radius of curvature from the convex portions 5 are formed, so that the antireflection film 1 of the first embodiment is formed.
It is not necessary to maintain the interval between the base films 2 and 3 by using a spacer as in the above, and the shapes and arrangements of the convex portions 5 and the concave portions 6 can be accurately set, and the configuration can be further simplified. it can.

[Fourth Embodiment] FIG. 9 is a sectional view showing an antireflection plate according to a fourth embodiment of the present invention. This anti-reflection plate 51 is different from the anti-reflection plate 41 of the above-described third embodiment in that the anti-reflection plate 41 of the above-described third embodiment is different.
However, the radius of curvature r ₁ of the convex portion 5 is about 150 μm, and the radius of curvature r ₂ of the concave portion 6 is about 120 μm, which are different from each other. On the other hand, in the antireflection plate 51 of the present embodiment, The point is that the radius of curvature r ₁ of the convex portion 5 and the radius of curvature r ₂ of the concave portion 6 match each other. Here, the radius of curvature r ₁ of the convex portion 5 and the radius of curvature r ₂ of the concave portion 6 are both 140 μm.

The method of attaching and fixing the anti-reflection plate 51 to the screen of the image display device is exactly the same as that of the anti-reflection plate 41 of the third embodiment. In the anti-reflection plate 51, the radius of curvature r ₁ of the convex portion 5 and the radius of curvature r ₂ of the concave portion 6 match each other, so that the transmitted light passing through the anti-reflection plate 51 is made parallel to the incident light. Can be held,
Image distortion can be prevented.

Although the embodiments of the anti-reflection member of the present invention have been described with reference to the drawings, the specific configuration is not limited to this embodiment, and the design is not deviated from the gist of the present invention. Can be changed. For example,
Thickness and material of base films 2 and 3, transparent glass plate 4
2, the thickness, the composition, the radius of curvature, the pitch, and the like of each of the convex portions 5 and the concave portions 6 can be appropriately changed. Further, these numerical values are not limited to the numerical values of the above-described embodiments.

[0047]

As described above, according to the antireflection member of the present invention, a pair of transparent film bases are arranged to face each other, and a curved surface is formed on one of the outer surfaces of these film bases. A large number of convex portions having a surface are formed, and a large number of concave portions having a curved surface are formed on one of the other outer surfaces, and correspond to the optical axis of each of the convex portions and each of these convex portions. Since the optical axis of the concave portion coincides with the configuration, by attaching this antireflection member to the screen of any image display device, projection and reflection of external light on the screen surface, and reflection of the external image can be performed conventionally. Compared with this, the image display device can be significantly reduced, and the visibility of the image display device can be improved.

Further, since the pair of film bases are arranged close to each other so that the light transmitted through these film bases does not interfere with each other, there is no possibility that the light transmitted through these bases causes moire image interference fringes and the like. The visibility of the display device can be further improved. The distance between these film substrates needs to be close enough that Newton's rings do not occur, and can be solved, for example, by setting it to about 40 μm.

Further, a large number of convex portions having a curved surface are formed on one surface of a transparent plate-shaped substrate,
A large number of concave portions having a curved surface are formed on the other surface, and the optical axis of each of the convex portions coincides with the optical axis of the concave portion corresponding to each of the convex portions. By attaching the member to the screen of any image display device, projection and reflection of external light on the screen surface, and reflection of the external image can be significantly reduced as compared with the conventional one,
The visibility of the image display device can be improved. In addition, since the configuration using the plate-shaped base material is used, the shapes and positions of the convex portions and the concave portions can be accurately set, and the configuration of the base material can be further simplified.

In addition, the height of each of the large number of convex portions and the pitch between adjacent convex portions are irregularly arranged, and the depth of each of the large number of concave portions and the pitch between adjacent concave portions are irregular. Since the arrangement is arranged, the direction in which the external light and the light of the external image are scattered and the amount of the scattered light in each of the plurality of convex portions are irregular (random), and the projection and reflection of the external light on the screen surface are performed. , And reflection of an external image can be further reduced, and the visibility of the image display device can be further improved. In addition, since the pitch of the convex portions and the concave portions is made random to prevent the moiré phenomenon and the interference fringes, it can be made closer to paper white.

Further, since the radius of curvature of the convex portion and the radius of curvature of the concave portion match each other, the parallel state of incident light and transmitted light of the antireflection member can be maintained.
Image distortion can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an antireflection film according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the antireflection film according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a reflective liquid crystal display device including the antireflection film according to the first embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating the operation of the antireflection film according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating the operation of the antireflection film according to the first embodiment of the present invention.

FIG. 6 is a sectional view showing an antireflection film according to a second embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating the operation of the antireflection film according to the second embodiment of the present invention.

FIG. 8 is a sectional view showing an anti-reflection plate according to a third embodiment of the present invention.

FIG. 9 is a cross-sectional view illustrating an antireflection plate according to a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 31 Antireflection film 2, 3 Base film (film base material) 4 Spacer 5 Convex part 6 Concave part 11 Reflection type liquid crystal display device 12 STN liquid crystal layer 13 Upper glass substrate 14 Lower glass substrate 15 STN type liquid crystal cell 16 Phase difference plate 17 Upper polarizing plate 18 Lower polarizing plate 19 Reflecting plate 20 Adhesive 21, 22 Transparent electrode 23, 24 Alignment film 41, 51 Antireflection plate 42 Transparent glass plate (transparent plate-shaped base material)

Continued on the front page F term (reference) 2H042 BA04 BA12 BA20 2H091 FA08X FA08Z FA11X FA14Z FA29X FA37X FD03 FD15 GA03 GA06 HA10 LA03 LA12 LA16 LA21 5G435 AA00 AA01 BB12 BB16 DD12 EE33 FF00 FF03 FF05 HH02H03 H03

Claims (6)

[Claims] 1. A pair of transparent film substrates are arranged opposite to each other, and a large number of convex portions having a curved surface are formed on the outer surface of one of these film substrates, and one of the other is formed. A large number of concave portions having a curved surface are formed on the outer surface of the convex portion, and the optical axis of each of the convex portions is coincident with the optical axis of the concave portion corresponding to each of the convex portions. Anti-reflection member. 2. The anti-reflection member according to claim 1, wherein the pair of film bases are arranged close to each other so that light transmitted through the film bases does not interfere with each other. 3. A plurality of convex portions having a curved surface are formed on one surface of a transparent plate-shaped substrate, and a plurality of concave portions having a curved surface are formed on the other surface.
An anti-reflection member, wherein an optical axis of each of the convex portions is coincident with an optical axis of the concave portion corresponding to each of the convex portions. 4. The height of each of the plurality of protrusions and the pitch between adjacent protrusions are irregularly arranged, and the depth of each of the plurality of recesses and the pitch between adjacent recesses are irregular. 4. The anti-reflection member according to claim 1, wherein the anti-reflection member is disposed. 5. The curvature radius of the convex portion and the curvature radius of the concave portion are coincident with each other.
The antireflection member according to any one of the above items. 6. An image display device comprising the antireflection member according to claim 1. Description: