gan layer, to expose the n-type gan layer, then the definition of light-emitting region and the elecode. f. ito ansparent conductive layer deposition, followed by deposition of cr / au metal layer, at 200 under niogen atmosphere alloy for the production of p elecode and n elecode. figure 4 shows the flow chart section of gan led before; figure 5 is a chemical wet etching patterns on sapphire subsate (), then the growth of gan led epitaxial layer sucture. figure 2 after wet chemical etching sapphire subsate () of the cross-section diagram of figure 3, after wet chemical etching sapphire subsate () of the optical microscope photographs. figure 4 gan led front-end process flow diagram in figure 5 sapphire wet etching after the graphic, then the growth of gan.neon sign
after completion of the measurement, disconnect the s1 and s2, wait 15 minutes before closing s1, oscilloscope set above, and then closing s2, the valid values recorded at this time is the oscilloscope conols work after connecting the connection led module current and connection voltage should not exceed the led module is equipped with the rating (current and / or voltage) of 1.1 times. at the same time, the measurement conol devices shall not exceed the led maximum output current or nominal maximum output voltage. note: the above measurements, the oscilloscope should be set at a measurement of ac and dc (including ripple current) state, the measured value should include direct current (pulsating dc) and ac components, the integral value should be ue after the rms ( rms). 2, the working voltage and current during the period prior to this test, samples tested by standard response to 5.2 and / or 5.3 classification, only for the correct classification, in order to complete the standard condemnation correctly chapter .writing board
led backlight technology advantages of the two: light elegant led backlight is the number of grid-like semiconductors, each "grid" has an led in both the semiconductor, so that you can successfully planar source. the plane of the light source not only has excellent brightness uniformity, do not need a complex optical design. as a result, lcd thickness will be able to do more light, while with higher reliability and stability. belong to the aditional ccfl light tube, to evenly spread the light of their issue to the panel in every region needs a rather complex auxiliary components. its difficult to conol the thickness of the screen, and with the panel increases, the need to use multiple light sources, which further exacerbates the complexity and cost of design, large screen lcd tv which is more sensitive. for example, 50 inches above the lcd or tv product.neon beer sign