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Light diffusion sheet and backlight unit using the same
| Details |
Inventors: Uekita, Masakazu; Mineo, Yutaka;
Assignee: Keiwa Inc. (Osaka, JP)
Primary Examiner: Robinson; Mark A.
Assistant Examiner: Amari; Alessandro
Attorney, Agent or Firm: Jordan and Hamburg LLP
Objects of the present invention is to provide light diffusion sheets capable of exhibiting improved heat resistance, thermal dimensional stability and weather resistance while maintaining transparency, which hardly give rise to bending, yellowing and the like even though they receive generated heat from a lamp and ultraviolet ray irradiation, and to provide backlight units in which reduction of the occurrence of lack in uniformity of the brightness are achieved using the light diffusion sheet.The light diffusion sheet according to the present invention comprises a transparent substrate sheet and a light diffusion layer overlaid to the front face side of the substrate sheet, wherein this light diffusion layer includes a light diffusing agent in a binder, with this binder being formed from a polymer composition comprising polyol and a fine inorganic filler, and having a glass transition temperature of 50.degree. C. or greater and 80.degree. C. or less, and with this fine inorganic filler having a mean particle diameter of 5 nm or greater and 50 nm or less. |
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DETAILED DESCRIPTION The present invention was accomplished taking into account of such disadvantages, and objects of the present invention are to provide a light diffusion sheet capable of improving heat resistance, thermal dimensional stability and weather resistance while maintaining high light transmittance, which hardly gives rise to bending, yellowing and the like even though it receives generated heat from the lamp and ultraviolet ray irradiation, and to provide a backlight unit in which reduction of the occurrence of lack in uniformity of the brightness and lowering of the brightness is achieved using such a light diffusion sheet.
The present invention which was accomplished to solve the problems described above is a light diffusion sheet comprising a transparent substrate sheet and a light diffusion layer overlaid to the front face side of this substrate sheet, wherein this light diffusion layer includes a light diffusing agent in a binder, with this binder being formed from a polymer composition comprising polyol and a fine inorganic filler, and having a glass transition temperature of 50.
degree.
C.
or greater and 80.
degree.
C.
or less, and with this fine inorganic filler having a mean particle diameter of 5 nm or greater and 50 nm or less.
As the "glass transition temperature" herein, a value measured by a differential scanning calorimetric analysis (DSC) defined in JIS is adopted.
According to such a light diffusion sheet, because polyol is used as a base polymer of the binder for the light diffusion layer, high transparency as well as excellent weather resistance and processing characteristics are achieved.
In addition, because the binder for the light diffusion layer has a glass transition temperature of 50.
degree.
C.
or greater and 80.
degree.
C.
or less, heat resistance of the light diffusion layer can be improved.
Moreover, because a fine inorganic filler is included in the polymer composition, heat resistance of the light diffusion layer can be further improved.
On behalf of the mean particle diameter of the dispersed fine inorganic filler to be included for the purpose of improving heat resistance being 5 nm or greater and 50 nm or less, shorter wavelength than visible light is provided, thereby allowing to maintain the transparency of the light diffusion layer
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