Surface illuminator and liquid crystal display having the same
First Claim
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1. A surface illuminator comprising:
- a light exit region which extends in the shape of a plane and from which light exits;
a light guide region arranged to guide light to the light exit region;
a light entrance surface through which light enters the light guide region;
a reflective surface on a side portion of the light guide region extending from an end of the light entrance surface and reflecting light in the light guide region;
an LED module including a plurality of LEDs alternately and discretely provided along the light entrance surface, the LEDs including different spectral characteristics; and
a color irregularity correcting resistor disposed within the LED module and connected in parallel with only a predetermined one or more the LEDs at an end of the LED module located on a side of the reflective surface such that the color irregularity correcting resistor reduces color irregularities adjacent to an end of the reflective surface;
wherein color irregularities are reduced when displaying white by matching the luminance ratios of beams of light in primary colors from the LEDs and making the peripheral luminance ratios of the colors uniform.
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Abstract
The invention provides a surface illuminator capable of achieving high display quality by employing an array of discrete light sources constituted by a plurality of LEDs and a liquid crystal display having the same. The surface illuminator includes an LED module which is a plurality of LEDs alternately and discretely provided along a light entrance surface and a color irregularity correcting resistor which is connected in parallel with a predetermined LED at an end of the LED module and which provides a bypass for a current supplied to the LED.
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Citations
16 Claims
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1. A surface illuminator comprising:
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a light exit region which extends in the shape of a plane and from which light exits; a light guide region arranged to guide light to the light exit region; a light entrance surface through which light enters the light guide region; a reflective surface on a side portion of the light guide region extending from an end of the light entrance surface and reflecting light in the light guide region; an LED module including a plurality of LEDs alternately and discretely provided along the light entrance surface, the LEDs including different spectral characteristics; and a color irregularity correcting resistor disposed within the LED module and connected in parallel with only a predetermined one or more the LEDs at an end of the LED module located on a side of the reflective surface such that the color irregularity correcting resistor reduces color irregularities adjacent to an end of the reflective surface; wherein color irregularities are reduced when displaying white by matching the luminance ratios of beams of light in primary colors from the LEDs and making the peripheral luminance ratios of the colors uniform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification