JPS6224201A - Light control film - Google Patents

Abstract

PURPOSE:To provide electrical conductivity to a film without hindering at all the light matching characteristic that the film possesses by providing conduc tive films which shut off the spaces formed between transparent partition walls of a prescribed pattern and further forming light shielding layers on the side faces of the transparent partition walls or forming light shielding walls within the spaces. CONSTITUTION:The conductive films 4 are provided on the bases of the spaces 10 formed between the transparent partition walls 2 of the prescribed pattern. The films 4 shut off the spaces 10 in the bottom thereof so that the specified spacer remains in the upper part of each space. The light shielding layers 3 are formed on the entire side face of the walls 2. The layers 3 are formed by dyeing the side faces of the walls 2. Parallel light L1 transmits the walls 2 and travels forward. On the other hand, steeply inclined oblique light L3 emitted from a light sourcve is absorbed by the layers 3. Nearly the parallel light, i.e., the matched light is thus obtd. forward by such light control film 1.

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a light control film suitable as a display surface of an optical display device, and more specifically, it is a light control film for adjusting transmitted light so that it becomes parallel light, and for preventing static electricity and shielding electromagnetic waves. The present invention relates to a light control film equipped with a conductive film for carrying out. BACKGROUND OF THE INVENTION Light control films of this type are well known in the art. Its typical structure is made by adhering a synthetic resin light-shielding partition wall (light-absorbing partition wall) in a predetermined pattern onto a transparent resin film. When this light control film is illuminated by a light source installed behind it, the oblique light incident obliquely to the film is absorbed by the light-shielding partition wall, and only the parallel light incident almost perpendicularly to the film is reflected between the light-shielding partition walls. It is possible to pass through the space of , and obtain uniform light forward. The above-mentioned conventional light control film uses a resin material, and since this resin material is generally an insulator, it can be used as an anti-reflection film for external light on a CRT screen, for example, to prevent static electricity from charging. If you try to do this, you will need a separate antistatic film, and if you want to shield harmful electromagnetic waves,
There were some inconveniences, such as the need for a separate electromagnetic shielding film. On the other hand, the light-shielding layer □The cut wall itself is mixed with a conductive material in advance.
It is conceivable to make the material more conductive, but in this case, the problem of light reflection due to the mixed conductive material arises. Technical Problems of the Present Invention Accordingly, the technical problem to be solved by the present invention is to provide a light control film with conductivity without interfering with the light regulation properties inherent to the film. Summary of the present invention (Structure, operation, effect) In order to solve the above technical problem, the present invention was constructed as follows. That is, in the light control film according to the present invention, a conductive film is provided in the space formed between the transparent partition walls of a predetermined pattern to block the space, and a light blocking layer is further formed on the side surface of the transparent partition wall. Alternatively, a light-shielding wall is formed within the space. According to the above configuration, the light emitted from the light source is adjusted by passing through the transparent partition wall of the light control film. Furthermore, since this light control film is provided with a conductive film, it is possible to prevent static electricity and shield electromagnetic waves. Shiran ■ (First Embodiment) FIG. 1 shows the first embodiment. In the figure, 2 is a transparent partition wall with a predetermined pattern. This pattern has various forms, such as a honeycomb shape, a lattice shape, or a parallel line shape. This transparent partition wall 2
A conductive film 4 is provided at the bottom of the space IO formed between them. This conductive film 4 blocks each space 10 at its bottom, leaving a certain amount of space above it. and,
A light shielding layer 3 is formed on all sides of the transparent partition wall 2. In this embodiment, the light-shielding layer 3 is formed by dyeing the side surface of the transparent partition wall 2 with a light-shielding dye. In the above configuration, parallel light emitted from a light source (not shown) passes through the transparent partition wall 2 and reaches the front, as shown in the figure. On the other hand, the steep oblique light L emitted from the light source
3 is absorbed by the light shielding layer 3. Therefore, this light control film 1 allows substantially parallel light, that is, uniform light, to be obtained in the front. Furthermore, in the above configuration, since the conductive film 4 is provided in the space between the transparent partition walls 2, it is possible to prevent static electricity and to effectively shield electromagnetic waves emitted from display equipment. (Modification 1 of the first embodiment) FIG. 3 shows a modification of the first embodiment. In this modification, a transparent base layer 5 is integrally provided on the bottom surface of the light control film in the first embodiment shown in FIG. This transparent base layer 5 has a conductive film 4 and/or
Alternatively, it is for supporting the transparent partition wall 2. This modification is very effective when the conductive film 4 is formed on the transparent base layer 5 by printing, or when the transparent partition walls 2 have a pattern that does not connect to each other. The functions of the light control film in this modified example, such as light regulating properties, antistatic properties, and electromagnetic shielding, are the same as those in the first embodiment. (Modification 2 of the first embodiment) FIG. 2 shows a second modification of the first embodiment. This second modification is substantially the same as the first modification, except that the second modification is characterized in that the transparent partition wall 2 and the transparent base layer 5 are integrally formed of the same material. (Second Embodiment) FIG. 4 shows a second embodiment. This embodiment is characterized by increasing the precision of light adjustment by increasing the height of the transparent partition wall 2. In this embodiment, as shown in the figure, a conductive film 4 is provided at the intermediate portion in the height direction of the transparent partition wall 2, which has approximately twice the height of the transparent partition wall 2 of the first embodiment. A light-shielding layer 3 is formed on all sides of the upper transparent partition wall 2a located above the conductive film 4 and on all sides of the lower transparent partition wall 2b located below the conductive film 4. According to the second embodiment, the visible angle α2 of the allowable oblique light transmitted through the light control film is the same as that shown in FIG.

[It is smaller than the similar visible angle α1 in the example. In other words, the light control film according to the second embodiment has higher precision in regulating light and can obtain more parallel light. (Third Embodiment) FIG. 5 shows a third embodiment. This embodiment is characterized in that a light shielding wall 11 is used in place of the light shielding layer 3 in the first embodiment shown in FIG. That is, as shown in FIG. 5, the space between the transparent partition walls 2 is filled with a light-shielding wall 11 containing a light-absorbing substance. In this example as well, the functions of the light control film, such as light regulating properties, antistatic properties, and electromagnetic wave shielding, are primary.
This is similar to the example. (Manufacturing method) A method of manufacturing the light control film according to the first embodiment shown in FIG. 1 will be described below with reference to FIG. 6. [First step...FIG. 6(A)] First, a predetermined pattern of conductive material M4, ie, a thin metal plate 4, is placed on the transparent film 5 constituting the transparent base layer. The pattern of the metal plate 4 is, for example, a grid pattern as shown in FIG. In FIG. 7, the hatched lattice-shaped portion is the metal portion, ie, the light-shielding portion 4a, and the portion surrounded by the light-shielding portion 4a is the hole portion, ie, the light-transmitting portion 4b.

[Second Step...FIG. 6(A)] Next, a photocurable resin liquid 6 is applied onto the transparent film 5.

[Third step...FIG. 6(A)] Next, photocuring is applied to the layer of the photocurable resin liquid 6.
1 [Provide a resistant resin film 7.
1

[Fourth step...FIG. 6(A)] Next, ultraviolet rays are irradiated from the side opposite to the metal plate of the transparent film 5 to remove the light-transmitting portions 4 of the transparent film 5 and the metal plate 4.
Only the transparent portion 6b of the photocurable resin liquid 6 is photocured by the ultraviolet light transmitted through the photocurable resin film 7, and only the transparent portion 7b of the photocurable resin film 7 is made insoluble. A portion 6a of the photocurable resin liquid 6 corresponding to the light shielding portion 4a of the metal plate 4 remains uncured. Further, a portion 7a of the photocurable resin film 7 corresponding to the light shielding portion 4a of the metal plate 4 maintains its solubility.

[Fifth step...FIG. 6(B)] Next, the uncured portion 6a of the photocurable resin liquid of the first intermediate light control film obtained in the fourth step corresponding to the metal plate light shielding portion and the photocurable The solubility/metal plate light shielding portion corresponding portion 7a of the resin film 7 is treated with an alkaline solution, for example.
The transparent partition wall 2 is formed by cleaning and removing.

[Sixth step...Figure 6(C)] Next, the second intermediate light control film obtained in the fifth step is immersed in the dyeing solution 9 in the dyeing tank 8, and the photocurable resin solution is applied. The entire surface of the photocurable/transparent part 6b of No. 6, ie, the side surface of the transparent partition wall 2, is dyed. Generally, photocurable resin has the property of being dyed, but it is possible to select a material for the transparent film 5 that does not have the property of being dyed. In this case, the transparent film 5 is hardly dyed.

[Seventh Step] Finally, the photocurable/transparent portion 7b of the photocurable resin film 7 and the transparent film 5 are removed from the third intermediate light control film obtained in the sixth step. By doing so, only the photocurable/transparent portion 6b of the photocurable resin liquid 6, that is, the side surface of the transparent partition wall 2, is dyed, and the light shielding layer 3 is formed. That is, the top and bottom surfaces of the transparent partition wall 2 are not dyed. However, the surface of the metal plate 4 is rarely dyed. In addition, if a material that is not dyed is selected as the transparent film 5, it may be allowed to remain. Accordingly, the light control film 1 shown in FIG. 1 can be obtained through the above steps. According to the above manufacturing method, the metal plate, that is, the conductive film 4 is used as a mask means during ultraviolet irradiation.
I, no separate masking means is required. Further, according to the above manufacturing method, since the conductive film 4 is used as a negative type mask means,
□Light control according to the embodiments and modifications □The transparent partition wall 2 formed by this method has excellent light resistance against external light. The films shown in FIGS. 2 to 5 are appropriately manufactured according to the above manufacturing method.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is a vertical sectional view of a main part of a light control film according to the first embodiment, and FIG.
3 is a vertical cross-sectional view of a main part of a light control film according to a modification of the first embodiment, FIG. 4.5 is a vertical cross-sectional view of a main part of a second embodiment and a third embodiment, respectively, and FIG. is the first
FIG. 7 is a process diagram showing one manufacturing method of the light control film according to the example, and a plan view showing the pattern of the conductive film used in the manufacturing method in FIG. 6. l... Light control film, 2... Transparent partition wall, 2a... Upper transparent partition wall, 2b... Lower transparent partition wall, 3... Light shielding layer, 4... Conductive film (metal plate), 4a...light-shielding part, 4b...light-transmitting part, body...transparent base layer (transparent film), 6...photocurable resin liquid, 6a
...Metal plate light shielding part corresponding part, 6b...Transparent part, 7...
- Photocurable resin film, 7a...Metal plate light shielding part corresponding part, 7b...Transparent part, 8...Dyeing tank, 10...Space, 11...Light blocking wall. Figure 5 Figure 7 Go to Z e-c 1 Fear Castle Pig

Claims (1)

[Claims] 1. A conductive film (4) that blocks the space (10) is provided in the space (10) formed between the transparent partition walls (2) of a predetermined pattern, and the side surface of the transparent partition wall (2) is further provided. A light control film characterized in that a light-shielding layer (3) is formed in the space (10), or a light-shielding wall (11) is formed in the space (10).