Optical member and display device having the same

A display device comprising:

• a display panel which displays an image;
• an optical member disposed under the display panel, wherein the optical member comprises:
• a light guide part having a first refractive index and comprising a first side surface, a second side surface opposite to the first side surface, and an upper surface connecting the first side surface and the second side surface;
• a first pattern part having a second refractive index smaller than the first refractive index and disposed on the upper surface of the light guide part;
• and
• a second pattern part disposed on the first pattern part;
• and
• a first light source unit disposed to face the first side surface, wherein the first light source provides a light to the first side surface,
• wherein
• a first area and a second area are sequentially defined on the upper surface in a first direction from the first side surface to the second side surface, and
• a first area ratio of an overlapping portion of the first pattern part with the first area to the first area is greater than a second area ratio of an overlapping portion of the first pattern part with the second area to the second area.

A display device comprising:

• a display panel which displays an image;
• a backlight unit disposed under the display panel, wherein the backlight unit provides a light to the display panel,
• wherein the backlight unit comprises:
• an optical member disposed under the display panel;
• and
• a light source which generates the light and provides the light to the optical member,
• wherein the optical member comprises:
• a light guide part having a first refractive index, wherein a side surface of the light guide part faces the light source to receive the light;
• a first pattern part disposed on the upper surface of the light guide part and having a second refractive index smaller than the first refractive index, wherein the first pattern part reflects a portion of the light guided by the light guide part and incident thereto;
• and
• a second pattern part comprising a plurality of light condensing patterns,
• wherein
• a first area and a second area are defined in an upper surface of the light guide part,
• a distance of the first area from the light source is less than a distance of the second area from the light source, and
• a first area ratio of an overlapping portion of the first pattern part with the first area to the first area is greater than a second area ratio of an overlapping portion of the first pattern part with the second area to the second area