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Adhesive sheet, backlight unit, and display device

A technology of adhesive sheet and backlight source, applied in the direction of optical components, optics, adhesives, etc., can solve the problems of uneven image brightness and low water resistance of illuminants

Pending Publication Date: 2021-03-05
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when a plurality of illuminants are used as a light source of a direct type backlight, since the water resistance of the illuminants is low, it is desirable to seal the illuminants with resin or the like.
In addition, when a display device is fabricated using a backlight having a plurality of illuminants as a light source, brightness unevenness occurs in the resulting image due to the presence and non-existence of illuminants.

Method used

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  • Adhesive sheet, backlight unit, and display device
  • Adhesive sheet, backlight unit, and display device
  • Adhesive sheet, backlight unit, and display device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0099] (2) Preparation of adhesive composition P

[0100] The adhesive composition P can be prepared by the preparation of (meth) acrylate polymer (a), the resulting (meth) acrylate polymer (A), a crosslinking agent (B) and optical diffusion Particles (C) mixed while adding additives to the desired addition.

[0101] (Meth) Acrylate Polymer (a) can be prepared by polymerizing a mixture of monomers constituting the polymer using a usual free radical polymerization. The polymerization of the (meth) acrylate polymer (A) is preferably carried out as needed using a polymerization initiator and is carried out by solution polymerization. However, the present invention is not limited thereto, or polymerization can be carried out without solvent. Examples of the polymerization solvent include ethyl acetate, n-butyl acetate, isobutyl acetate, toluene, acetone, hexane, methyl ethyl ketone, or the like, can also be used simultaneously.

[0102] Examples of the polymerization initiator include...

manufacture example

[0128] As a manufacturing example of the adhesive sheet 1, the case where the above adhesive composition P is used. The coating liquid of the adhesive composition P is applied to the release surface of a peeling piece 12a (or 12b), and the heating treatment is performed to heat the adhesive composition P, and after the coating layer is formed, the coating layer is formed. The stripping surface of another peeling piece 12b (or 12a) is superimposed. When the ripening period is required, by setting the ripening period, the coating layer is a adhesive layer 11, and the coating layer is directly formed in the adhesive layer 11 when the coating stage is required. Thereby, the adhesive sheet 1 is obtained. Conditions of heating treatment and ripening are as described above.

[0129] As another manufacturing example of the adhesive sheet 1, the coating liquid coated with the adhesive composition P is applied to the peel surface of a peeling piece 12a, and the adhesive composition P is comb...

Embodiment 1

[0173] 1. Preparation of (meth) acrylate polymer

[0174] 3 parts by mass of acrylate, 30 parts by mass of acrylate, 10 parts by mass of acrylate, 10 parts by mass of acrylate, 10 parts by mass of acryl morpholine and 20 parts by mass of acrylate, prepared (Meth) acrylate polymer (a). The molecular weight of the (meth) acrylate polymer (A) was measured by the method described later, and as a result, the weight average molecular weight (MW) was 500,000.

[0175] 2. Preparation of the adhesive composition

[0176] 100 parts by mass (solid component conversion value; the same), the following step 1 (meth) acrylate polymer (A), 0.2 parts by mass of trihydroxymethyl propylene alkane as a crosslinking agent (B) Polybenzoisoco., LTD. Made, product name "BHS8515"), 7.5 parts by weight of the silicone resin (containing a silicon-containing compound having an inorganic and organic intermediate structure) is formed by light diffusion particles (C). Light diffusion particles (C1; Momentive Pe...

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Abstract

The invention provides an adhesive sheet, a backlight unit, and a display device. The adhesive sheet exhibits a high haze value and is excellent in color unevenness suppression. The adhesive sheet (1)is provided with an adhesive layer (11), the adhesive constituting the adhesive layer (11) contains light diffusion fine particles, and the average value of the haze value of the adhesive layer (11)with respect to light rays having a wavelength of 380 nm, the haze value of the adhesive layer (11) with respect to light rays having a wavelength of 580 nm, and the haze value of the adhesive layer (11) with respect to light rays having a wavelength of 780 nm is 70-100%. The standard deviation of the haze value of the adhesive layer (11) with respect to a light beam having a wavelength of 380 nm,the haze value of the adhesive layer (11) with respect to a light beam having a wavelength of 580 nm, and the haze value of the adhesive layer (11) with respect to a light beam having a wavelength of780 nm is 7.50 or less, and the total light transmittance of the adhesive layer (11) is 70% or more.

Description

Technical field [0001] The present invention relates to an adhesive sheet having an adhesive layer having a light diffusibility, and a backlight unit and a display device that can utilize the adhesive sheet. Background technique [0002] In recent years, a portable telephone, a smartphone, a flat-panel terminal, a game console is used as a display device (display), and a liquid crystal display device is used. The display portion formed by the liquid crystal panel or the like is not emitted by itself, and thus the display device of the display portion includes a backlight that illuminates the display unit. [0003] To date, the light source of the backlight in the display device as described above is typically a side entry type of the light source in the side of the light guide plate. On the other hand, recently, from the brightness of the screen, the straight backlight of the light source is configured directly below the display unit is started. For the straight type backlight, i...

Claims

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Application Information

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IPC IPC(8): C09J7/10C09J7/30C09J133/08C09J11/08C09J11/06G02F1/13357G02B5/02
CPCC09J7/10C09J7/30C09J133/08C09J11/08C09J11/06G02F1/133606G02F1/133603G02B5/0242C08L83/04C08L33/12C08L25/06C08L61/28C08K5/5435
Inventor 福岛裕贵高桥洋一小鲭翔
Owner LINTEC CORP
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