Display device and presentation device equipped with same

A display device comprising a switch unit configured to detect a finger approaching or touching a push button operated by a user's finger and a display unit configured to display a desired design,

• the switch unit including:
• a first light projecting unit configured to emit a light;
• a first light guide plate having an incident surface on which light emitted from the first light projecting unit is incident, a plurality of first prisms configured to reflect the light incident from the incident surface toward a side approached or touched by the finger and are provided at positions corresponding to the push buttons, and an exit surface configured to emit the light reflected by the first prisms in a direction in which the finger approaches or touches;
• a plurality of light receiving units that are provided at positions corresponding to the push buttons and is configured to receive the light emitted from the exit surface and reflected by the finger approaching or touching the push button;
• and
• a detection unit configured to detect the finger approaching or touching of the finger depending on an amount of light received by the light receiving unit,
• the display unit including:
• a second light guide plate having a plurality of second prisms configured to cause an incident light to reflect and display the desired design, and
• a second light projecting unit configured to emit the light to the second light guide plate and cause the light to reflect on the plurality of the second prisms,
• wherein the plurality of light receiving units have different detection sensitivity so as to compensate for an amount of light that decreases depending on a distance from the first light projecting unit.

A display device comprising a switch unit configured to detect a finger approaching or touching a push button operated by a user's finger and a display unit configured to display a desired design,

• the switch unit including:
• a first light projecting unit configured to emit a light;
• a first light guide plate having an incident surface on which light emitted from the first light projecting unit is incident, a plurality of first prisms configured to reflect the light incident from the incident surface toward a side approached or touched by the finger and are provided at positions corresponding to the push buttons, and an exit surface configured to emit the light reflected by the first prisms in a direction in which the finger approaches or touches;
• a plurality of light receiving units that are provided at positions corresponding to the push buttons and is configured to receive the light emitted from the exit surface and reflected by the finger approaching or touching the push button;
• and
• a detection unit configured to detect the finger approaching or touching of the finger depending on an amount of light received by the light receiving unit,
• the display unit including:
• a second light guide plate having a plurality of second prisms configured to cause an incident light to reflect and display the desired design, and
• a second light projecting unit configured to emit the light to the second light guide plate and cause the light to reflect on the plurality of the second prisms,
• wherein the first light projecting unit and the second light projecting unit emit a light having a different wavelength range, respectively.