JPH06119908A - Edge light panel and its production method - Google Patents

Abstract

PURPOSE:To provide an edge light panel and its producing method, which can produce panels simply and certainly, wherein Moire's phenomenon due to missing of dot is eliminated resulting from overlapping of screen mesh of screen printing over the dot end. CONSTITUTION:A negative pattern of high density pores is screen printed on an acrylic clear base board using an ultraviolet ray hardening ink, and after ultraviolet hardening, random reflection substance such as ink medium, etc., is applied to the whole area of the negative pattern, and the negative pattern is exfoliated after natural drying, and thereby a random reflection pattern due to dot is residually formed on the clear board to form an edge light panel. Owing to difference in the tight attachment, the negative pattern can be exfoliated using a strong wind pressure, pressure sensitive adhesive tape, etc. This provide producibility for edge light panels without makong screen printing of the dot, so that generation of Moire's phenomenon can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge light panel used in various edge light illuminators such as liquid crystal backlights and surface illuminators, and a method for producing the same.

[0002]

2. Description of the Related Art An edge light panel of this kind is provided with a diffuse reflection pattern by a dot pattern in which dots are arranged in a minute high density on a surface of a transparent substrate such as an acrylic resin. It is supposed that a diffuse reflection material added with a white pigment, glass beads or the like is used as a printing ink, and desired dot patterns are screen-printed on the surface of the transparent substrate.

In addition, Japanese Patent Application No. 3-34211 of the present inventors
As shown in No. 3, it has been known that it is extremely effective to improve the brightness by providing a laminated top reflective layer on each dot of the dot pattern forming the irregular reflection pattern by, for example, thermal transfer. .

[0004]

The production of edge light panels by screen printing is a very effective production method, but on the other hand, since screen printing is through a screen screen, the screen screen is printed at the dot end. When the dots are overlapped with each other in the overlapped area, the dots are chipped, and the refractive index of light in the chipped part changes, resulting in abnormal light emission. There is a problem that the yield easily lowers because the edge light panel that causes this moire phenomenon is treated as a defective product, and the screen mesh is minute, for example, 270 mesh. Therefore, it is easy to cause clogging by additives such as white pigments and glass beads added to the above printing ink, and frequent cleaning is required. Must, therefore there is a problem that reduces the productivity.

In addition, the one provided with the above-mentioned top reflection layer is extremely effective for improving the brightness in practice, but in this case, since the top reflection layer is formed on each dot after the dot pattern is formed by the screen printing, an edge is formed. The manufacturing of the light panel becomes extremely complicated, resulting in many defective rates. Also, the method of forming the top reflection layer by thermal transfer is relatively simple, but sometimes the transparent substrate is deformed by heating. There is a problem that it becomes a cause.

The present invention has been made in view of the above circumstances, and the problem to be solved is to solve these problems and to allow simple and reliable production without the occurrence of the moire phenomenon. An edge light panel capable of automating its production and a method of producing the same.

[0007]

According to the present invention, in accordance with the above problems, the present invention avoids the screen printing of dot patterns to form a high density porous negative pattern, and applies a diffuse reflection material or a reflective material for dot formation to this negative pattern. Then, the dot pattern is formed by coating so as to form the dot pattern by peeling and removing the negative pattern, that is, the present invention provides a diffuse reflection pattern of high density dots and a high density porous pattern of the pattern. An edge light panel (claim 1), characterized in that it is composed of dots of a positive pattern diffuse reflection material which are left on the transparent substrate by applying it to a transparent substrate under masking of the negative pattern and peeling off the negative pattern to remove the negative pattern. The masking of the high density porous negative pattern according to claim 1 is performed by screen printing of an ultraviolet curable ink and An edge light panel (claim 2), characterized in that the diffuse reflection material is formed as an ink medium, and the surface of the diffuse reflection material according to claim 1 or 2 is further coated in the form of a top coat under the masking of a high density porous negative pattern. An edge light panel (claim 3) characterized in that a surface reflection layer is additionally provided, a masking step for peelably adhering a high-density porous negative pattern on a transparent substrate surface, and a diffuse reflection material on the negative pattern. 4. A method for producing an edge light panel, comprising: a coating step of coating; and a peeling step of peeling and removing the negative pattern to leave a positive pattern diffuse reflection material on the transparent substrate (claim 4). The masking process is a negative pattern printing process using UV curable ink, and the UV curing process of UV irradiation after the masking process. The method for producing an edge light panel (claim 5), which is additionally provided, wherein the applying step of claim 4 or 5 is a medium applying step of applying an ink medium, and natural drying after the applying step. A method for producing an edge light panel, characterized by further comprising a drying step (claim 6);
A method for producing an edge light panel, further comprising a laminated coating step of further coating the diffused reflective material in a laminated state after the coating step of claim 4 or the drying step thereof. Item 7) and the peeling steps of claims 4 to 7 are automatic peeling steps by strong wind pressure or strong water pressure. As a means for solving the above problems.

In the present invention, the ink medium is
Generally, it is used to mean an ink main agent or auxiliary agent used in forming an ink vehicle or diluting the density of an ink.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically with reference to the drawings showing the following embodiments. In FIGS. 1 to 3, A is a liquid crystal backlight mounted on a liquid crystal display device and illuminating the liquid crystal surface from the back side. The liquid crystal backlight A includes a diffusion sheet made of a milky white polyester film having a thickness of, for example, 75 μm, an edge light panel 10 and a reflection sheet 2 made of a white polyester low-foaming film having a thickness of 75 μm, for example, while being laminated from the liquid crystal surface side. Both end faces of the edge light panel 10 are made incident end faces 12, and a tube-shaped light source 3 made of each cold cathode tube is arranged on the incident end faces 12 for both-end light sources.

In this example, the edge light panel 10 is
For example, the diffused reflection pattern 20 by the high density dots 22 is formed on one side surface of the transparent substrate 11 made of the acrylic resin having a size of 155 × 200 mm with a reduced thickness of 155 × 200 mm, that is, the back side surface.
It is equipped with.

The irregular reflection pattern 20 has a dot 22 having a large number of circular dots and a density of 50%. The irregular reflection pattern 20 is masked with a high density porous negative pattern 30 of the transparent substrate 11 under the mask. Apply to
By removing the negative pattern 30 by peeling off, the dots 22 of the positive pattern diffuse reflection material remaining and formed on the transparent substrate 11 are formed.

In this diffuse reflection pattern 20, further, in this embodiment, the dots 22 are gradually increased in area so that the amount of diffuse reflection is gradually increased from each light source 3 side toward the maximum area portion 21 at the center of the surface. It has been done.

On the other hand, the masking of the high density porous negative pattern 30 is carried out by screen printing of ultraviolet curing ink (UV ink), and the dots 22
The diffuse reflection substance of is an ink medium to which fine resin beads are added for promoting diffuse reflection.
By forming 2 with this ink medium, each dot 22 is effectively diffusedly reflected, and at the time of this diffused reflection, each dot 22 is also made to shine, and the edge light panel 10 is illuminated uniformly with high brightness along with the above-mentioned gradual increase in area. I'm trying to make a difference.

This will be described based on the method of producing the edge light panel 10. In the edge light panel 10, the high density porous negative pattern 3 is formed on the surface of the transparent substrate 11 in this example.
Masking process using UV curable ink so that 0 can be peeled off, that is, a negative pattern printing process, UV curing process of UV irradiation for curing ink by UV, the negative pattern 3
0, a coating process of applying a diffuse reflection material, that is, an ink medium, a drying process of naturally drying the ink medium, and peeling and removing the negative pattern 30 to leave the dots 22 of the positive pattern of the ink medium on the transparent substrate 11. The steps are provided, and the edge light panel 10 is produced by passing these steps over time.

As shown in FIG. 2, the negative pattern 30 is peeled off from the cleaned transparent substrate 11 as a pattern in which the irregular reflection pattern 20 formed by the dots 22 is reversed so as to form a protective surface made by Mino Group Co., Ltd., for example. It is formed by screen printing using a UV curable ink for printing.

In the ultraviolet curing process after the negative pattern printing process, for example, an ultraviolet irradiating device 40 for screen printing by Eye Graphics Light Series SP manufactured by Eye Graphics Co. is used, and the transparent substrate 11 is placed on the conveyor 41. For example, it is performed by irradiating ultraviolet rays from two mercury lamps or metal haland lamps 42 at a conveyor speed of 10 m / min. At this time, the heat ray cut filter 43 absorbs heat rays generated in the lamp 42 to protect the transparent substrate 11 and cure the ultraviolet curable ink.

The ink pattern containing the fine resin beads is applied to the cured negative pattern 30 so as to cover the entire surface thereof by an appropriate method such as a curtain coater method, a knife coater method or a spray coater method.

By this application, the ink medium is applied so as to enter the surface of the high-density porous negative pattern 30 and all the holes, and the ink medium is applied to the surface of the transparent substrate 11 in the holes of the negative pattern 30, for example, a conventional screen. Adhesion is the same as when printed.

After the ink medium is sufficiently dried and cured by a natural drying process, the negative pattern 30 is peeled and removed by a peeling process to leave the dots 22 of the ink medium on the transparent substrate 11 and the remaining dots. The diffuse reflection pattern 20 by 22 is formed on the transparent substrate 11.

This peeling removal is performed by applying a pressure such as strong wind pressure or strong water pressure that does not damage the ink medium of the transparent substrate 11 and the dots 22, or by sticking the adhesive sheet to the surface and then peeling it off. , Automatically or manually.

In this example, the ink medium has a very good adhesion to the transparent substrate 11 made of acrylic resin as seen in a screen printed edge light panel, while the UV curable ink is generally used for the substrate to be printed. However, the adhesiveness to the transparent substrate 11 is much higher than that of the ultraviolet curable ink, and therefore, the adhesiveness to the transparent substrate 11 is large in the peeling step. Due to the difference in sex, the negative pattern 30 made of the ultraviolet curable ink may cause the irregular reflection pattern 20 of the dots 22 made of the ink medium to be formed on the transparent substrate 11.
It remains to be formed and is peeled off.

FIG. 3 shows a state in which the ink medium is applied onto the negative pattern 30 (lower left portion) by the production method of this example, and a diffuse reflection pattern (upper right portion) obtained by peeling off the negative pattern 30.
As shown here, each dot 22 of the ink medium is formed into a circular shape as desired to form a diffused reflection pattern without chipping as shown in FIG. The above-mentioned liquid crystal backlight A using is for performing uniform illumination with high brightness equivalent to the diffuse reflection pattern by the conventional screen printing (note that the dark portion in the center of FIG. 3 is for photographing). Tone does not change in this part).

In the figure, reference numeral 44 is a blower of the ultraviolet irradiation device 40, and 45 is a fan for discharging air.

Although the illustrated example is as described above, in the present invention, since the coating step after the high density porous negative pattern is formed in close contact with the transparent substrate can be performed plural times, the irregular reflection The pattern dots can be formed by stacking them. Therefore, it is also possible to apply another diffuse reflection substance or a reflection substance having a different composition in the form of an overcoat after the application of the diffuse reflection substance. For example, by applying the above-mentioned ink medium containing titanium oxide as the reflection substance, An edge light panel in which a top reflection layer is additionally provided on the surface of the dots can be provided, and it is possible to realize an improvement in brightness as in Japanese Patent Application No. 3-342113 without heating.

Further, the adhesion of the negative pattern is performed by adhering a peelable high-density porous sheet to a transparent substrate,
When this adhesion formation is performed by a printing means such as screen printing, a solvent, a plasticizer or the like is added to the ink to facilitate peeling and removal, and other ink suitable for a curing accelerating means other than ultraviolet irradiation is used as a curing accelerating means. That the diffuse reflection material is white or milky white ink, and that it is also suitable for curing acceleration means other than natural drying, and that the coating means is applied to the entire surface of the transparent substrate by using other known means. In carrying out the present invention, including the steps to be performed, a transparent substrate, a diffuse reflection pattern, a negative pattern, dots, an ultraviolet curable ink, an ink medium, a top reflective layer, a masking step, a negative pattern printing step, an ultraviolet curing step, a coating step. , Specific material, shape, structure, size, means of each of the drying process and peeling process, addition to these, specific configuration including the number of light sources of the edge light panel, use It can be variously modified without departing from the essence of the invention is of course, would be punished which are readily understood by one of skill in the art.

[0026]

According to the present invention, the diffuse reflection pattern of high density dots is applied to a transparent substrate under masking of the high density porous negative pattern of the pattern according to claim 1, and the negative pattern is peeled off to remove the transparent substrate. And a masking step of closely adhering the high density porous negative pattern to the surface of the transparent substrate in a peelable manner, and a diffuse reflection material on the negative pattern. It is characterized by comprising a coating step for coating and a peeling step for peeling and removing the negative pattern to leave the positive pattern diffuse reflection substance remaining on the transparent substrate. It is possible to obtain a uniform edge light panel with high brightness without causing the moire phenomenon due to Moni, enhanced yield, and unnecessary the cleaning accompanying Sukurin printing, it is possible to provide an edge light panel and its production method can be significantly improved productivity.

According to a second aspect of the present invention, the high density porous negative pattern is masked by screen printing of an ultraviolet curable ink and the diffuse reflection material is ink medium. 7. A negative pattern printing process using a cured ink, and an ultraviolet curing process of ultraviolet irradiation after the masking process are additionally provided, and the coating process according to claim 6 is a medium coating process for coating an ink medium. In addition to the above, in addition to the above, an edge light panel that is simple, reliable, high in brightness, and excellent in uniformity is provided. Can be obtained and provided with a method of producing it, and in this case using screen printing, Not occur printing as leading to lack of dots to Sukurin print Negapatan dense porous,
Therefore, the moire phenomenon is prevented, and further, in the sixth aspect, the heating can be avoided in the production of the edge light panel, and even if the transparent substrate made of resin is used, the influence of the heating such as the deformation can be eliminated.

A third aspect of the present invention is characterized in that a top reflective layer is additionally provided on the surface of the irregular reflection material under the masking of a high density porous negative pattern so as to be applied in the form of a top coat. In addition to the above, in addition to the above, in addition to the above, the diffuse reflection pattern is also added to the diffuse reflection pattern. It is possible to obtain an edge light panel having a top reflective layer and having improved brightness, and to provide a production method thereof.

[0029] Further, according to claim 8, the peeling step is an automatic peeling step by a strong wind pressure or a strong water pressure. Therefore, in addition to the above, a relatively complicated peeling step can be automated. It becomes possible to produce an edge light panel by a series of automation lines together with other steps suitable for automation.

[Brief description of drawings]

Fig. 1 Exploded perspective view of the LCD backlight Fig. 2 Plan view showing the negative pattern Fig. 3 Partially enlarged plan view showing the diffuse reflection material coating state and the negative pattern peeling state Fig. 4 Edgelight panel production process diagram Fig. 5 Longitudinal section showing the UV irradiation device Figure

[Explanation of symbols]

 A LCD backlight 10 Edge light panel 11 Transparent substrate 20 Diffuse reflection pattern 22 Dots 30 Negative pattern

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[Procedure amendment]

[Submission date] March 24, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a liquid crystal backlight.

FIG. 2 is a plan view showing a negative pattern.

FIG. 3 is a partially enlarged plan view showing a state where a diffuse reflection material is applied and a state where a negative pattern is peeled off.

[Figure 4] Edge light panel production process diagram

FIG. 5 is a vertical sectional view showing an ultraviolet irradiation device.

[Explanation of Codes] A Liquid crystal backlight 10 Edge light panel 11 Transparent substrate 20 Diffuse reflection pattern 22 Dots 30 Negative pattern

Claims (8)

[Claims] 1. A dot of a positive pattern diffuse reflection material remaining on the transparent substrate by applying a diffuse reflection pattern of high density dots to a transparent substrate under masking of a high density porous negative pattern of the pattern and peeling and removing the negative pattern. An edge light panel characterized by being configured by. 2. An edge light panel, wherein the masking of the high density porous negative pattern according to claim 1 is performed by screen printing of an ultraviolet curable ink, and the diffuse reflection material is an ink medium. 3. The surface of the diffused reflection material according to claim 1 or 2,
An edge light panel characterized by further comprising a top reflective layer applied as a top coat under masking of a high density porous negative pattern. 4. A masking step for peelably adhering a high-density porous negative pattern on a transparent substrate surface, a coating step for applying a diffuse reflection material on the negative pattern, and a peeling removal of the negative pattern to make the diffuse reflection material of the positive pattern transparent. A method of producing an edge light panel, comprising: a peeling step for leaving the substrate. 5. The production of an edge light panel, wherein the masking step according to claim 4 is a negative pattern printing step using an ultraviolet curable ink, and an ultraviolet curing step of ultraviolet irradiation is additionally provided after the masking step. Method. 6. The edge light panel according to claim 4, wherein the coating step according to claim 4 or 5 is a medium coating step of coating an ink medium, and a natural drying step is additionally provided after the coating step. Production method. 7. The edge light panel, further comprising a laminated coating step of further coating the diffused reflective material in a laminated form after the coating step of claim 4 or the drying step thereof. Production method. 8. A method for producing an edge light panel, wherein the peeling step according to any one of claims 4 to 7 is an automatic peeling step using strong wind pressure or strong water pressure.