| 摘要 |
PROBLEM TO BE SOLVED: To provide an image display device capable of displaying a favorable image.SOLUTION: An image display device 1 includes: a light guide plate 6; light sources 2a and 2b; a directivity control sheet 3; and a liquid crystal panel 4. The light guide plate 6 has a substantially planer shape having a side surface as a light incident surface and one of principal surfaces as a light emission surface. The light sources 2a and 2b cause light to be incident on the light incident surface of the light guide plate 6. The directivity control sheet 3 receives emission light emitted from the light guide plate 6, and converts the emission light to have a desired light distribution characteristic and emits the converted light. The liquid crystal panel 4 is provided to a light emission side of the directivity control sheet 3 and performs spatial modulation on incident light according to a video signal so as to form an image. The directivity control sheet 3 has a prism array 31 on the light incident surface. The prism array 31 is constituted of an arrangement of a plurality of prisms having a substantially triangle shape in cross section. An angle formed by a bisector of an apex angle of the prism and a normal line with respect to a bottom surface of the prism gradually varies from an end portion to a center portion of the directivity control sheet 3. |
