Illumination device and display device

A display device comprising:

• a front casing;
• a rear casing;
• a display panel supported by a middle chassis between the front casing and rear casing;
• at least one light source on a light source substrate configured to emit light of a first wavelength range between the front casing and rear casing;
• a luminescent body comprising quantum dot particles having an axis of 1 micron to 100 microns and being in a resin positioned to receive the light, the luminescent body having a light entrance surface;
• and
• an optical member supported by the middle chassis, the optical member having a light incident surface facing the luminescent body and a light emission surface having a planar shape that faces the display panel;
• a reflection sheet between the display panel and the rear casing;
• and
• a fixing member surrounding the at least one light source and having a heat dissipation member attached thereto,
• wherein the luminescent body is configured such that a portion of the light of the first wavelength range is converted to light of at least a second wavelength range and is configured to transmit light of the first wavelength through the luminescent body at an oblique angle with respect to the light entrance surface without colliding with the wavelength conversion material to pass as it is to the light incident surface of the optical member.