Display device

A display device, comprising:

• a light source module, generating directional light;
• a display module, disposed above the light source module and having a vertical electric field therein, and the display module comprising:
• a first substrate, having a first inner surface and a first outer surface;
• a second substrate, disposed opposite to the first substrate and having a second inner surface and a second outer surface, wherein the vertical electric field is formed between the second inner surface and the first inner surface;
• and
• a display medium, disposed between the first substrate and the second substrate, wherein the display medium is optically isotropic, and the display medium is optically anisotropic when it is driven by the vertical electric field, and when the directional light enters the display module, the directional light is not perpendicular to the first outer surface, wherein a first included angle between the incident direction that the directional light of the light source module enters the display module and the first outer surface of the first substrate is between 5 degrees˜45 degrees, and when the directional light exits the display module, it is not perpendicular to the second outer surface, wherein the display medium comprises blue phase liquid crystals;
• and
• a guiding optical film, disposed on the second outer surface of the second substrate of the display module and having a light incident surface and a light emitting surface, wherein the directional light enters the guiding optical film from the light incident surface and exits the guiding optical film through the light emitting surface to form emitting light, and a second included angle is between an emitting direction of the emitting light and the light emitting surface.