Light emitting display device having light receiving element for receiving light from light emitting element and self-holding and optical passage for guiding drive light to the light receiving element

A light emitting display device comprising:

• a light receiving element;
• a light emitting element which is electrically connected in series with the light receiving element and has a bottom surface fixed to the light receiving element, wherein light emitted from a side surface of the light emitting element enters into a light receiving surface which is not facing the bottom surface of the light emitting element and is a part of an upper surface of the light receiving element to make the light receiving element conductive;
• and
• an optical passage which has a body below the light receiving element and an extension which extends upward from the body and is arranged adjacent to the light receiving element, and reflects a drive light which travels upward through the extension at an upper end of the extension to make the drive light enter into the light receiving surface of the light receiving element.

A light emitting display device comprising:

• a plurality of light emitting elements which output lights having different wavelengths;
• a light receiving element which is connected in series with each of the plural number of light emitting elements, and becomes conductive upon receiving light having a wavelength corresponding to each color of the lights emitted from the light emitting elements;
• an optical passage which transmits both of each of data lights representing data of the plural number of wavelengths corresponding to the plural number of different colors of lights and a scanning light, and guides both the lights to the light receiving element;
• and
• a color filter which is provided between the optical passage and the light receiving element, and allows only light for making of the light receiving element conductive to pass through the color filter.

A light emitting display device comprising:

• a light emitting element;
• a light receiving element which is electrically connected in series with the light emitting element so that the light receiving element drives the light emitting element to make the light emitting element emit light when the light receiving element becomes conductive, and is arranged so that the light receiving element becomes conductive upon receiving light emitted from the light emitting element, and which becomes conductive upon receiving both drive signals of a data signal and a scanning signal;
• an optical passage which guides a light signal representing one of the data signal and the scanning signal;
• and
• an electric passage which conducts an electric signal representing the other of the data signal and the scanning signal to the light receiving element.

A light emitting display device comprising:

• a semiconductor display section wherein a plurality of semiconductor display elements each comprised of a semiconductor light emitting element and a semiconductor light receiving element which is electrically connected in series with the semiconductor light emitting element so that the semiconductor light receiving element drives the semiconductor light emitting element when the semiconductor light receiving element becomes conductive and is arranged so that the semiconductor light receiving element becomes conductive upon receiving light from the semiconductor light emitting element are arranged in a matrix comprised of rows and columns;
• an optical control section having a laser diode array which generates a signal light for line-sequentially driving the plural number of semiconductor display elements, a lens array which converges the signal light from the laser diode array, and a mirror for deflecting the signal light from the lens array;
• and
• an optical guide section which guides the signal light from the mirror of the optical control section to the semiconductor light receiving element of the semiconductor display section.