Patent ID: 11934001
Assignee: JAPAN DISPLAY INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  F | IPC F  G

Claim 8:
9. A lighting device comprising:
a light guide,
a reflecting sheet disposed under the light guide, and
a first prism sheet disposed over the light guide,
wherein, a first white LEDs are disposed in a same interval on a first side surface of the light guide, and a second white LEDs are disposed in a same interval on a second side surface, which opposes to the first side surface,
a first prism array extending in an orthogonal direction to the first side surface and arranged in a parallel direction with the first side surface is formed on a major surface of the light guide,
a second prism array extending in a parallel direction with the first side surface and arranged in an orthogonal direction to the first side surface is formed on a back surface of the light guide,
the reflecting sheet is disposed under the back surface of the light guide,
the first prism sheet is disposed on the major surface of the light guide,
a third prism array, extending in a parallel direction with the first side surface of the first light guide and arranged in orthogonal direction to the side surface of the first light guide is formed on a first surface of the first prism sheet opposing to the light guide,
a second prism sheet is disposed on the first prism sheet,
a fourth prism array extending in an orthogonal direction to the first side surface and arranged in a parallel direction with the first side surface is formed on a second surface opposing to the light guide, and
a first pitch of the first prism array and a second pitch of the second prism array are smaller than a third pitch of the third prism array and a fourth pitch of the fourth prism array.