Led array capable of reducing uneven brightness distribution

Abstract

The present invention relates to an LED array capable of reducing uneven brightness distribution. A semiconductor LED array comprises a plurality of semiconductor LED elements disposed on an oblong substrate that is long in a first direction and arranged along with said first direction. Each LED element comprises an electrode layer formed on the substrate, a semiconductor LED stack formed on the electrode layer, stretched long in the first direction and comprising a p-type semiconductor layer, an active layer and an n-type semiconductor layer, a first wiring layer formed along and in parallel to one long side of the semiconductor LED stack, and second wiring layers extending to a direction of a short side from the first wiring layer and electrically connected to the n-type semiconductor layer on a surface of the semiconductor LED stack. The first wiring layers are disposed on different long sides of the semiconductor LED stacks in the adjacent LED elements.

Description

field of invention [0001] The present invention relates to a semiconductor light emitting element array and a vehicle lamp using the semiconductor light emitting element array. Background technique [0002] For light emitting diode (LED) elements used in vehicle headlights, lighting equipment, etc., high power is required. If the size of the element is simply enlarged, the drive current becomes too large, and it becomes difficult to make the current flow uniformly in the element. Therefore, in order to obtain high-power LEDs, a plurality of LED elements are arranged in series to form an LED array (for example, refer to Japanese Laid-Open Patent Publication No. 2001-156331). [0003] In applications such as car headlights, oblong LED arrays are required. However, an increase in the number of LED elements is not preferable because the ratio of non-light-emitting areas between elements increases. Thus, the shape of each LED element in the LED array becomes a rectangle. [0...

AI Technical Summary

Problems solved by technology

Therefore, the injection current decreases from the right power supply side to the left and produces uneven brightness distribution

[0008] In addition, since the wiring electrodes 611 having a width of approximately 40 μm are provided between the LED elements 601, the intervals between the LED elements 601 become wide and the luminance decreases; therefore, unevenness is generated between the center and peripheral regions of the elements. Brightness distribution

If a headlight or the like is manufactured using the LED array 600 composed of the above conventional LED elements 601, uneven brightness occurs in the projected image

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