JP3073841U - Anti-reflective sheet - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide an antireflection sheet capable of effectively preventing light reflection on a screen such as a liquid crystal and maintaining the brightness of the screen at almost the same brightness as before the sheet is attached. SOLUTION: It has a base sheet and an antireflection layer laminated on the base sheet, and has a haze degree in a range of 5% to 40% and a total light transmittance of 70% to 91.5%. Within range. Further, it is preferable that the anti-reflection layer is formed of a mixture of a binder component of a thermosetting resin and a silica particle component. The thickness of the anti-reflection layer is preferably from 10 to 20 μm.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an antireflection sheet that is attached to a surface of a liquid crystal screen or the like to prevent reflection of the screen.

[0002]

[Prior art]

 Conventionally, in order to prevent reflection of a liquid crystal screen or the like or to protect the screen, various screen sheets to be attached to the surface of a liquid crystal screen or the like have been developed. In particular, reflection of light on a liquid crystal screen, etc. causes flickering of the screen and reflection of the background of the worker on the screen, which hinders the work on the screen. Is done. From such a point of view, the screen sheet that has been subjected to various processes is intended to adjust the reflection of light on the screen to solve the above problem.

[0003]

[Problems to be solved by the invention]

 However, the effect of preventing light reflection may not be sufficient with a conventional screen sheet, and even if the effect of preventing light reflection can be effectively performed, the screen becomes darker than before the sheet is pasted, and the screen becomes darker. Sometimes it was hard to see. The present invention has been made in view of such a problem, and its purpose is to effectively prevent light reflection on a screen such as a liquid crystal display and to reduce the brightness of the screen before pasting a sheet. An object of the present invention is to provide an anti-reflection sheet capable of maintaining substantially the same brightness.

[0004]

[Means for Solving the Problems]

 In view of the above object, the present invention employs the following solutions. That is, the antireflection sheet according to the present invention includes a base sheet and a light antireflection layer provided on the base sheet surface, and has a haze (haze, hereinafter the same) within a range of 5% to 40%. The total light transmittance is in the range of 70% to 91.5%. According to this means, the antireflection sheet effectively prevents light reflection and has good light transmittance, so that flicker on the screen and reflection of the background can be avoided, and the sheet can be prevented from being reflected. Even after pasting, the screen remains in the bright state before pasting the sheet.

It is preferable that the anti-reflection layer is formed of a mixture of a binder component of a thermosetting resin and a silica particle component. According to this means, the light is diffused by the silica particles to effectively prevent light reflection and has an appropriate transmittance, and the thermosetting resin is cured by heat to impart a certain degree of hardness to the sheet. Is done. Therefore, it is preferable to have the functions of preventing light reflection and transmitting light, and to protect the screen. Further, the thickness of the light reflection preventing layer is more preferably 10 to 20 μm.

[0006]

[Embodiment of the invention]

 Hereinafter, the antireflection sheet according to the present invention will be described in detail. FIG. 1 is a sectional view showing an embodiment of the antireflection sheet according to the present invention. An antireflection sheet (hereinafter, referred to as a sheet) 1 includes a PET base sheet 2 and a light antireflection layer 3 laminated on the surface of the base sheet 2, and a silicone-based base sheet 2 is provided on the back surface of the base sheet 2. An adhesive layer 4 formed of an adhesive is provided. The sheet 1 is provided with a separator 6 made of polypropylene via an adhesive layer 4.

The sheet 1 has a haze within a range of 5% to 40% and a total light transmittance of 70% to 91% in a state where the sheet 1 is attached to a screen such as a liquid crystal display (with a separator removed). It is within the range of 5%. With the haze degree and the total light transmittance, the above-described light reflection preventing effect and transmittance are realized. In order to achieve such light reflection preventing effect and transparency, it is preferable that the sheet 1 is in a so-called matte state (mat processing state). The sheet 1 realizes such a matte state by the anti-reflection layer 3.

The anti-reflection layer 3 according to the present embodiment is formed of a mixture of a binder component of a thermosetting resin and a silica particle component. The mixing ratio of the silica particle component to the binder component is appropriately adjusted so that the haze degree and the total light transmittance fall within the ranges described above. The antireflection layer 3 is formed by applying a mixture of a thermosetting resin component as a binder and a silica particle component to the surface of the base sheet 2 and heating the resin to cure the binder resin. Is formed in this resin.

The thickness of each part is 100 μm for the base sheet, 20 μm for the anti-reflection layer, 90 μm for the adhesive layer, and 50 μm for the separator. The thicknesses of the base sheet 2, the antireflection layer 3 and the adhesive layer 4 affect the haze and the total light transmittance described above. From this viewpoint, the thickness of the antireflection layer 3 is preferably about 10 to 20 μm, the thickness of the base sheet is about 100 to 125 μm, and the thickness of the adhesive layer is about 50 to 90 μm. Further, it is preferable that the separator is about 50 to 75 μm because the handling becomes easy.

In this embodiment, the anti-reflection layer 3 is formed by mixing silica particles. At this time, the size of the silica particles is preferably about 2 to 15 μm, Acrylic resin, polyester resin or the like can be used as the resin. Next, two types of sheets according to the present invention were prepared (Examples 1 and 2), and the haze degree and the total light transmittance were measured. Then, the film was actually pasted on a liquid crystal screen, and its light reflection preventing effect and transmittance were evaluated. PET (trade name Lumirror, manufactured by Toray) for the base sheet, silica particles (dispersed in thermosetting resin, trade names Sylysia, Fuji Silysia) for the anti-reflection layer, adhesive layer Silicon resin was used for the sample. Table 1 shows the results.

[0011]

[Table 1]

[0012] Each of these sheets has a haze degree and a total light transmittance within a predetermined range, can effectively prevent light reflection on a liquid crystal screen, and has a brightness of a screen before sticking the sheet. It was maintained at about the same level (visually). As described above, since heating is required when forming the anti-reflection layer, the base sheet needs to be formed of a material that can withstand the high temperature at this time. Specific examples include resins having a high softening temperature (200 ° C. or higher), such as polyester resins other than PET, polycarbonate resins, polyamide resins, cellulose resins, and fluororesins.

The anti-reflection layer 3 can also be formed by means other than the above-described silica particle mixing. For example, by forming a layer having a large number of fine irregularities on the surface of the base sheet by means such as polishing the surface of the base sheet or treating the surface of the base sheet with a solvent, this may be used as an antireflection layer. Good. As long as the sheet 1 can be processed into a matte state and the haze degree and the total light transmittance of the sheet 1 fall within the above-mentioned predetermined ranges, appropriate means can be adopted.

[0014]

[Effect of the invention]

 According to the antireflection sheet of the present invention, since the antireflection sheet has a haze degree and a total light transmittance in a predetermined range, light reflection on a screen such as a liquid crystal can be effectively prevented, and the brightness of the screen is adhered to the sheet. It can be maintained almost the same as the screen without attachment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an antireflection sheet according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 anti-reflection sheet 2 base sheet 3 anti-reflection layer 4 adhesive layer 5 sheet body 6 separator

Claims (3)

[Utility model registration claims] 1. A base sheet and an antireflection layer provided on a surface of the base sheet, wherein the haze is in the range of 5% to 40% and the total light transmittance is 70% to 91.5. % In the range of%. 2. The anti-reflection sheet according to claim 1, wherein the anti-reflection layer is formed of a blend of a binder component of a thermosetting resin and a silica particle component. 3. The thickness of the anti-reflection layer is 10 to 20 μm.
3. The antireflection sheet according to claim 1, wherein m is m.