Illuminating device, and display device and portable electronic device having the same

A display device comprising:

• a first display that, when illuminated with white light, exhibits a color display;
• a second display that, when illuminated with light, exhibits a monochromatic color display;
• a light source that emits a first light having a first color component;
• a light guide plate having an incidence surface on which the first light is incident, a first surface from which first light exits the light guide plate, and a second surface from which first light exits the light guide plate and illuminates the second display so that the second display exhibits a monochromatic color display;
• a light conversion element disposed between the first display and the first surface of the light guide plate and that converts first light exiting from the first surface to white light that illuminates the first display so that the first display exhibits a color display;
• and
• a color filter disposed between the second display and the second surface of the light guide plate and that has a layer in which is dispersed a pigment or a fluorescent substance,
• wherein the second display exhibits a monochromatic color display in a color different from the first color component of the first light.

A display device comprising:

• a first display that, when illuminated with white light, exhibits a color display;
• a second display that, when illuminated with light, exhibits a monochromatic color display;
• a light source that emits a first light having a first color component;
• a light guide plate having an incidence surface on which the first light is incident, a first surface from which first light exits the light guide plate, and a second surface from which first light exits the light guide plate and illuminates the second display so that the second display exhibits a monochromatic color display;
• a light conversion element disposed between the first display and the first surface of the light guide plate and that converts first light exiting from the first surface to white light that illuminates the first display so that the first display exhibits a color display;
• and
• a light cutting filter disposed between the second display and the second surface of the light guide plate and that cuts a particular color component among color components of first light exiting the second surface,
• wherein the second display exhibits a monochromatic color display in a color different from the first color component of the first light.

A display device comprising:

• a first display that, when illuminated with white light, exhibits a color display;
• a second display that, when illuminated with light, exhibits a monochromatic color display;
• a light source that emits a first light having a first color component, the light source comprising a light-emitting element that emits light, and a fluorescent substance that when excited by the light emitted from the light-emitting element generates the first light;
• a light guide plate having an incidence surface on which the first light is incident, a first surface from which first light exits the light guide plate, and a second surface from which first light exits the light guide plate and illuminates the second display so that the second display exhibits a monochromatic color display;
• and
• a light conversion element disposed between the first display and the first surface of the light guide plate and that converts first light exiting from the first surface to white light that illuminates the first display so that the first display exhibits a color display, the light conversion element comprising a color fluorescent substance that, when excited by the first light, generates a second light having a second color component different from the first color component and that mixes the first light with the second light to generate white light.