Patent ID: 7880190
Filing Date: 2011-02-01
Classification: B41J,H01L

Abstract:
1. A combined semiconductor device comprising: a first substrate having a first surface and a second surface, the first surface and the second surface being mutually parallel and disposed on mutually opposite sides of the first substrate, the first substrate being transparent to light of a certain wavelength; a transparent conductive film provided on the first surface of the first substrate; an array of thin semiconductor films disposed on the transparent conductive film, each thin semiconductor film of the array including a first film surface attached to the transparent conductive film on the first surface of the first substrate and a second film surface facing away from the first substrate, the transparent conductive film being sandwiched between the first substrate and the array of thin semiconductor films and being in direct contact with the first film surfaces of the thin semiconductor films of the array, each thin semiconductor film of the array having a light-emitting region which emits light of said certain wavelength through the first substrate, one of the thin semiconductor films of said array of thin semiconductor films being a first thin semiconductor film having a thickness of substantially 0.5 to 10 micrometers, the first thin semiconductor film including the light-emitting region emitting light of said certain wavelength through the first substrate so that the light emerges from the second surface of the first substrate; an interconnecting electrode made of conductive and reflective film metal material covering the second film surface of the first thin semiconductor film so as to reflect light emitted by the light-emitting region back through the first thin semiconductor film toward the first substrate; and a lens disposed in contact with the second surface of the first substrate to focus the light emitted from the light-emitting region through the first substrate onto a predetermined surface, wherein the thickness of the first substrate is chosen in relation to a refractive index of the first substrate so as to match a focal length of the lens.