Lg Chem, Ltd

Lg Display Co., Ltd.

Yune-Hyoun Kim

Sang-Choll Han

Kwang-Seung Park

Byung-Su Park

Jin-hyun Kim

Sang-Eun An

Seung-Tae Oh

Jung-Min Ko

Byung-Mook Kim

Byoung-Mook Kim

A backlight unit includes a light source and a two-dimensional micro lens array (MLA) sheet including a plurality of lens unit each having a conic lens shape with a cross-section, taken through the lens axis, having a shape defined by the equation: 

Backlight unit including array of hyperbolically-shaped micro lenses

The present invention relates to an optical film having improved optical performance and to a backlight unit comprising the same. More particularly, the present invention relates to a microlens array (MLA) sheet which comprises a base unit and a lens unit formed on one side of the base unit, wherein the lens unit consists of a plurality of conical lenses. Existing hemispherical microlens array sheets have limitations in terms of improving luminance, and therefore cannot replace prism sheets in high luminance product s. However, the microlens array sheet consisting of conical lenses of the present invention can improve both luminance and viewing angle characteristics.

Optical film having improved optical performance, and backlight unit comprising the same

The present invention relates to a microlens array sheet with enhanced optical performance, and a backlight unit having same, and more specifically, to a microlens array sheet and a backlight unit having same, the microlens array sheet comprising: a base portion; and a plurality of microlenses formed on one surface of the base portion, wherein the plurality of microlenses have an irregular array, and the standard deviation of the distance between the mid points of two microlenses adjacent to each other is, 2-20% of the average pitch(p) between microlenses adjacent from the mid point of a selected microlens after selecting one of the microlenses.

Micro-lens array sheet and backlight unit comprising the same

Provided is a backlight unit. The backlight unit includes a light source, an optical member configured to uniformly distribute light emitted from the light source, and at least two condensing films configured to condense light from the optical member. Hetero-conic lenses are two-dimensionally arranged on a surface of each of the condensing films, and each of the hetero-conic lenses is formed by combining a first conic lens expressed by Formula (1) below and a second conic lens expressed by Formula (2) below: 

Backlight unit comprising condensing film having hetero-conic lenses

A light extraction member includes a plurality of unit lenses arranged on one surface thereof. Each of the unit lenses comprises a combination of two or more kinds of conic lenses.

Light extraction member and organic light emitting diode including the same

There is provided a process of making a mold for optical films. The process of making a mold for optical films comprises: etching a stereostructure in a surface of the mold having a flat surface or an engraved convex and concave surface, by using a laser beam. The process of making a mold for optical films may be useful to easily mark spots, to control the height of protrusions and the position where the protrusions are formed, and also to form the protrusions having constant depths even in a curved surface such as a convex and concave surface.

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Daejeon, South Korea

Yune-Hyoun Kim