Light emitting element and liquid crystal display device

Abstract

A light emitting element (1) includes: a plurality of light emitting diodes [3 (R1, G11, . . . )] of two or more colors; and a light guide plate (4) for causing light from the respective plurality of light emitting diodes [3 (R1, G11, . . . )] to surface-emit. The light emitting diodes are provided along the light guide plate (4) in a given order. The light guide plate (4) includes: a color mixing section (5) for mixing colors of light from the respective plurality of light emitting diodes [3 (R1, G11, . . . )]; and a display section (6) for causing the light, which has been subjected to a color mixture by the color mixing section (5), to surface-emit. The plurality of light emitting diodes [3 (R1, G11, . . . )] decrease in their respective luminous intensities from a center toward ends of the light guide plate (4). This allows obtaining a well color-mixed white light source without being colored in a color of light emitted from a light emitting diode provided on a side end surface side of a light guide plate.

Description

TECHNICAL FIELD[0001]The present invention relates to a light emitting element including a light source unit provided with a plurality of light emitting diodes of two or more colors, the light emitting diodes being provided in a given order and a light guide plate for causing light from each of the plurality of light emitting diodes to surface-emit (emit in a form of plane emission), the light guide plate including a color mixing section for mixing colors of light from each of the plurality of light emitting diodes and, a display section for causing the light mixed by the color mixing section to surface-emit.BACKGROUND ART[0002]In a liquid crystal display device, an illumination device is provided on front or back side of a liquid crystal panel. A light source which is provided on back side is generally referred to as a backlight. There are two types of backlights: (i) a direct backlight in which a light source is provided directly below a liquid crystal panel; and (ii) a backlight ...

AI Technical Summary

Benefits of technology

This arrangement achieves a well-mixed white light source without edge color contamination, reduces the influence of light reflection, and allows for a narrower display device frame by ensuring uniform luminance and color reproducibility across the display.

Problems solved by technology

Therefore, in a case where a color of the light emitting diode which is closest to the edge of the light guide plate is for example red, there occurs a problem that white light cannot be emitted through a discontinuous side end surface of the light guide plate but a slightly reddish light is emitted.

However, since there is no light emitting diode provided on the right side, light amounts of respective colors other than a color of light emitted from the rightmost light emitting diode is small.

Unfortunately, light emitted to the right from the rightmost light emitting diode is totally reflected from the right edge surface.

This has caused a problem that a side end surface of a light guide plate is colored in a color of light emitted from a light emitting diode which is closest to the edge of the light guide plate.

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