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US 8,461,756 B2Granted
Linear white light source, and backlight and liquid crystal display device using the same
AssigneesKabushiki Kaisha Toshiba, Toshiba Materials Co., Ltd.
InventorsRyo Sakai, Yasuhiro Shirakawa, Hajime Takeuchi, Tsutomu Ishii, Yasumasa Ooya
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Abstract
A linear white light source 1 includes a base, a plurality of light emitting diode chips linearly disposed on the base and each generating ultraviolet light having a wavelength of not less than 330 nm nor more than 410 nm, and a phosphor layer continuously formed on the base to cover the plurality of light emitting diode chips and containing a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor.
Claims15
A linear white light source comprising:
- a base having a flat surface;
- a plurality of light emitting diode chips linearly disposed on the flat surface of the base and each generating ultraviolet light having a wavelength of not less than 330 nm nor more than 410 nm;
- and
- a phosphor layer continuously formed on the flat surface of the base to cover the plural light emitting diode chips and including a red light emitting phosphor, a green light emitting phosphor, and a blue light emitting phosphor,
- wherein the plural light emitting diode chips are disposed at an interval of 1 mm or more and 5 mm or less, and
- wherein the phosphor layer has a flat upper surface, and each of heights from the flat surface of the base to the flat upper surface of the phosphor layer in a first portion on which the light emitting diode chip is disposed and a second portion on which the light emitting diode chip is not disposed is in a range of 0.5 to 2 mm.
3 more elements
Dependencies are inferred from the claim text.