Light guide plate, display unit including the light guide plate, traffic sign including the display unit, and method of manufacturing the light guide plate and method of manufacturing the traffic sign

A display unit comprising:

• a light guide plate for guiding light entered from a side face thereof, toward a main face thereof;
• and a plurality of LEDs for emitting light toward the side face of the light guide plate,
• wherein the main face has a first diffusion region and a second diffusion region, and has a shape surrounded by at least three linear sections, and curved sections each interconnecting adjacent linear sections,
• the first diffusion region is a region having a plurality of first diffusion elements for diffusing the light entered from the side face, towards the main face,
• the second diffusion region is a region located between the first diffusion region and the corresponding curved section, and has a plurality of second diffusion elements for diffusing the light entered from the side face, towards the main face,
• the ratio of the area of the plurality of first diffusion elements within the first diffusion region is smaller than the ratio of the area of the plurality of second diffusion elements within the second diffusion region, and
• the LEDs are positioned at the outer side of the linear sections.

A traffic sign comprising:

• a light guide plate for guiding light entered from a side face toward a main face thereof;
• a display film provided on the front side of the main face, wherein the display film displays display information including letters, signs, figures, or a combination thereof;
• and a LED positioned at the outer side of the light guide plate, wherein the LED emits light into the side face of the light guide plate, and
• wherein the main face has a first diffusion region and a second diffusion region, and has a shape surrounded by at least three linear sections, and curved sections each interconnecting adjacent linear sections,
• the first diffusion region is a region having a plurality of first diffusion elements for diffusing the light entered from the side face, towards the main face,
• the second diffusion region is a region located between the first diffusion region and the corresponding curved section, and has a plurality of second diffusion elements for diffusing the light entered from the side face, towards the main face,
• the ratio of the area of a plurality of the first diffusion elements within the first diffusion region is smaller than the ratio of the area of a plurality of the second diffusion elements within the second diffusion region, and thereby the brightness difference of the entire display film can be reduced.