Abstract: There is provided an LED driving circuit. The LED driving circuit according to an aspect of the invention may include: at least one ladder circuit including: (n?1) number (here, n is a positive integer satisfying n?2) of first branches provided between first and second junction points, and connected in-line with each other by n number of first middle junction points, (n?1) number of second branches arranged in parallel with the first branches, and connected in-line with each other by n number of second middle junction points between the first and second junction points, and n number of middle branches connecting m-th first and second middle junction points to each other, wherein at least one LED device is disposed on each of the first, second, and middle branches. Here, the number of LED devices included in each of the first and second branches is greater than the number of LED devices included in each of the middle branches.

Abstract: Disclosed are a light emitting diode (LED) inspection apparatus, which can determine whether an LED has a defect such as leakage current, without making physical contact with the LED being inspected, and an LED inspection method thereof.

Abstract: There is provided an LED driving circuit including: at least one ladder network circuit including: (n+1) number of first branches connected in parallel with one another by n number of first middle junction points between a first junction point and a second junction point, where n denotes an integer satisfying n?2, (n+1) number of second branches connected in parallel with one another by n number of second middle junction points between the first junction point and the second junction point, the (n+1) number of second branches connected in parallel with the first branches; and n number of middle branches connecting the first and second middle junction points of an identical m sequence to each other, respectively, wherein each of the first and second, and middle branches comprises at least one LED device.

Abstract: A light emitting device including: at least one light emitting stack including first and second conductivity type semiconductor layers and an active layer disposed there between, the light emitting stack having first and second surfaces and side surfaces interposed between the first and second surfaces; first and second contacts formed on the first and second surface of the light emitting stack, respectively; a first insulating layer formed on the second surface and the side surfaces of the light emitting stack; a conductive layer connected to the second contact and extended along one of the side surfaces of the light emitting stack to have an extension portion adjacent to the first surface; and a substrate structure formed to surround the side surfaces and the second surface of the light emitting stack.

Abstract: A confocal electroluminescence spectral microscope including: a base board where an object including a material capable of emitting light is mounted; a power supply supplying current to enable the object mounted on the base board to electrically emit light; a confocal lens disposed above the base board to receive the light emitted from the object; a detection part disposed above the confocal lens to obtain energy distribution with respect to the light emitted from the object; and a pin hole disposed between the confocal lens and the detection part to allow a luminescence signal for a confocal point formed on a target surface of the object.