Patent ID: 8563990

Claim:
Electronic device, comprising: at least one die stack having a first die (D 1 ) comprising a first array of light emitting units for emitting light; a second layer (D 2 ) comprising a second array of via holes (VH); and a third die (D 3 ) comprising a third array of light detecting units (PD) for detecting light from the first array of light emitting units; wherein the second layer (D 2 ) is an interposer layer and is arranged between the first die (D 1 ) and the third die (D 3 ; wherein the first, second and third array are aligned such that light emitted by the first array of light emitting units passes through the second array of via holes (VH) and is detected by the third array of light detecting units (PD), wherein the first array of light emitting units comprise layers deposited and patterned onto the first die (D 1 ), and wherein the first die (D 1 ), the second layer (D 2 ), and the third die (D 3 ) are bonded one to the other.