Abstract: An optical lens includes a recessed part and a refracting part. The recessed part has a substantially circular plan view and a substantially V shaped cross-section. The recessed part forms an angle of no more than an angle of about 20° with respect to a vertical line. The recessed part has a plurality of curved surfaces including different radii so that a light incident into the recessed part is totally reflected from the curved surfaces. The refracting part has a substantially circular plan view extended from the recessed part. A light incident into the refracting part and the reflected light from the recessed part are refracted from the refracting part. Therefore, a luminance uniformity and a color uniformity are improved.

Abstract: Provided herein is a lens composition of an LED device for an LCD having high transparency and high heat resistance, and an LED device, a backlight unit and an LCD comprising the lens composition. The lens composition includes a copolymer represented by the formula 1 and having a weight average molecular weight of about 5,000 to about 500,000: wherein R1 and R2 independently represent a hydrogen atom, a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms or —COOR3 group in which R3 represents a linear, branched or cyclic alkyl group having 1 to 10 carbon atoms, R4 and R5 independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, the ratio n/n+m ranges from about 0.3 to about 0.995, and the ratio m/n+m ranges from about 0.005 to about 0.7.

Abstract: The invention provides a reflective plate that includes a first reflective part having a predetermined surface roughness and a second reflective part having a surface roughness that is less than the predetermined surface roughness of the first reflective part. The invention also provides a reflective plate that is capable of supplying a liquid crystal panel with substantially uniform light.

Abstract: A reflection sheet includes a reflection layer that reflects light irradiated from an external device and a dissipating layer that is formed on the reflection layer and dissipates the heat generated from a lamp unit in a horizontal direction toward an outside of the lamp unit. The dissipation layer has a thermal conductivity in a horizontal direction higher than that in a vertical direction and thus the heat may rapidly be transmitted to a first container. As a result, this may suppress the increment of temperatures in a backlight assembly, increase the luminance of the lamp unit, and improve a display quality of a liquid crystal display device.

Abstract: An optical member includes a light incident surface, a light exiting surface and a plurality of luminance uniformity enhancing members. The light exiting surface is opposite the light incident surface. The luminance uniformity enhancing members are formed on at least one of the light incident surface and the light exiting surface. Each of the luminance uniformity enhancing members includes a recessed surface formed between a first closed loop and a second closed loop surrounding the first closed loop. Therefore, luminance uniformity is enhanced due to the luminance uniformity enhancing member. Furthermore, a distance between a display panel and the backlight assembly may be reduced to decrease volume of a display apparatus, and a luminance of the display apparatus may be enhanced.

Abstract: Backlight assembly and the display device using the same are disclosed. Backlight assembly comprises a container and a detector. The container holds a light and electromagnetic field generating source and a sampling portion for passing the light and/or electromagnetic field. The detector is located on the outer space of the container and has an electromagnetic field reactive sensing unit and a body to support the sensing unit. Therefore, the backlight of the present invention can protect lamp from the successive malfunctioning and prevent fire.