Lighting unit including alternately arrange first and second light sources, backlight unit, liquid crystal display device
AssigneeSharp Kabushiki Kaisha
InventorsKentaro Kamada, Mitsuhiro Moriyasu, Keiji Hayashi, Ryoh Hatakeyama
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Abstract
In a lighting unit, fluorescent lights and LEDs of different spectroscopic characteristics are alternately arranged in a direction X on an irradiation plane. Light sources of equal light intensity are arranged in a certain pitch for the fluorescent lights such that a uniform light amount is achieved around end portions in the direction X. The LEDs include LEDs aligned on a bottom surface of a chassis and LEDs arranged on an inner sidewall surface of the chassis. As a result, a lighting unit having a uniform amount of light across an entire irradiation plane is achieved.
Claims11
A lighting unit comprising:
- a chassis including an opening on an irradiation plane side;
- first light sources and second light sources respectively having different spectroscopic characteristics, the first light sources and the second light sources being alternately arranged in a first array direction in the chassis;
- wherein
- the second light sources comprise a main light source aligned on a bottom surface of the chassis and an auxiliary light source arranged on an inner sidewall surface of the chassis;
- the second light sources consisting of two types of LEDs respectively having different spectroscopic characteristics, the two types of the LEDs are alternately arranged in a second array direction that is perpendicular or substantially perpendicular to the first array direction;
- at least one of the two types of LEDs comprises the main light source aligned on the bottom surface and the auxiliary light source arranged on the inner sidewall surface;
- and
- the first light sources and the second light sources are arranged such that light emitted only from the first light sources has uniform light intensity across an irradiation plane, and light emitted only from the second light sources has uniform light intensity across the irradiation plane.
Dependencies are inferred from the claim text.