2013年7月24日星期三

High Brightness LED cut outcrop angle


In fact, rarely heard in the same sentence with "early adopters" and "car market segment," two phrases. Some people might assert that this juxtaposition will become very popular in the oxymoron. However, high-brightness LED to car manufacturers to bring several compelling features, and, although this application is relatively new, but they are the basic characteristics of the majority comes from manufacturing LED indicators - much older than they are and have has been well-proven similar products - the same principle and similar processes.
Lcd display module taillights, turn signal lamps, work lights, brake lights can overcome the inherent incandescent tungsten several major drawbacks. Cars often suffered moderate shock and vibration will shorten the filament life. Similarly, the positive temperature coefficient of resistance of the filament due to inrush current will accelerate the destruction of the lamp. Thermal cycling - brake lights are working on an important feature, often shortened incandescent lamps.
Inrush current incandescent bulbs also makes circuit protection and fault detection task becomes complicated. Car manufacturers have to fuse ratings and fault detection threshold set to the current value large enough to accommodate the surge current amplitude and duration, and the fuse failure does not occur or will not detect false failures.
In contrast, a typical automobile suffering amplitude and frequency range of shock and vibration in the case, LED structure of the filaments is more durable. LGD structure and small size, light weight, thereby reducing the mechanical shock and vibration torque. LED small size, but also the automobile designers to design the lighting was smaller, and which is designed to better meet the overall vehicle design. For example, some cars are not the CHMSL (center high mounted stop lamp) module installed in the rear panel, but to use small LED needed this, this feature is included in the trunk lid.
Taillights lighting and control systems raises several interesting issues, which also appear in the control device and the control device are far apart from each other in other systems. mini lcd module  s essentially a current devices. The presence of electron-hole pairs within the composite organic electroluminescent compounds, and the photons emitted when the composite. Current increases will be a corresponding increase in the composite rate and flux output. Efficiency of this process is not 100% (almost less than 100%), so an increase in current consumption will be increased by 1-h of the device self-heating. Unless the poor working conditions, such as incandescent or LED is generally not as catastrophic failure, but it tends to darken due to aging. Many device designers to terminate the life of the LED light output is defined as the initial value of 50% down to time.
Overcurrent and overtemperature conditions can accelerate the LED end of life, so most of the OEM device manufacturers recommend carefully control LED energy.

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