Front light module and electronic paper display device having the same

摘要

The front light module includes a light guide plate, a light source, a first light transmissive substrate, a second light transmissive substrate, and a printing ink layer. The light guide plate has a first light emitting surface, a second light emitting surface, and a light incident surface. The light source faces the light incident surface. The first light transmissive substrate is located on the first light emitting surface. The second light transmissive substrate is located on the surface of the first light transmissive substrate facing away from the light guide plate, and the thickness of the second light transmissive substrate is smaller than that of the first light transmissive substrate. The printing ink layer is located on the surface of the second light transmissive substrate facing the first light transmissive substrate, and on an edge of the second light transmissive substrate.

主权项

1. A front light module for a display device having a display area, the front light module comprising:
a light guide plate having a first light emitting surface, a second light emitting surface opposite to the first light emitting surface, and a light incident surface between the first and second light emitting surfaces; a light source facing the light incident surface of the light guide plate; a first light transmissive substrate located on the first light emitting surface of the light guide plate; a second light transmissive substrate located on a surface of the first light transmissive substrate facing away from the light guide plate, wherein a thickness of the second light transmissive substrate is smaller than a thickness of the first light transmissive substrate; the first and second light transmissive substrates are stacked at the same side of the light guide plate, such that the first light transmissive substrate is between the second light transmissive substrate and the light guide plate; a printing ink layer located on a surface of the second light transmissive substrate facing the first light transmissive substrate, wherein the printing ink layer surrounds an edge of the surface of the second light transmissive substrate for shielding light, such that the display area is defined by the printing ink layer; the printing ink layer has a bottom surface that faces away from the surface of the second light transmissive substrate, and has a side surface that is adjacent to the bottom surface and the second light transmissive substrate; and a first adhesion layer between the first and second light transmissive substrates and in contact with the bottom surface and the side surface of the printing ink layer, and covering the printing ink layer.