The standard chip of the blue LED and the white LED is an LED chip housed in the package, and the size of one side is substantially 200 to 300 μm. The shape varies depending on the application, such as squares and rectangles. For example, white LEDs used in small liquid crystal panel backlight sources are mostly equipped with rectangular blue LED chips.
Compared with the standard chip, there is a large chip with a size of 1 mm square and an area 10 times that of the standard chip. In addition, the size is between the large chip and the standard chip, and the number of chips called "medium" is increasing.
In the past, LEDs with input power exceeding 1 W and LEDs for large backlights did not use standard chips, but used large chips. However, the recent method of installing multiple standard chips to increase the brightness (multi-chip type) has become more and more noticeable. At present, in the lighting application, from the most commonly used input power 1W class, to the multi-chip type with input power exceeding 10W, it is achieved, and the method of adopting large-size chips is competed. LED bulbs are also beginning to adopt multi-chip models. For example, Toshiba Lighting Technology released the product in January 2010, which uses 56 standard chips integrated into a package of white LEDs.
Reduces feature variation by overlapping multiple chips
The method of realizing a large output power white LED includes a method of using a large-sized blue LED chip of 1 mm square, and a method of housing a plurality of small-sized blue LED chips of about 0.3 mm square in one package. With a plurality of small-sized LED chips, even if the luminescence characteristics of the blue LED chips in the package are not uniform, since the luminescence spectra of each chip are superimposed, characteristic deviation between the different packages is less likely to occur.
Multi-chip and large chips have their own advantages and disadvantages. From the perspective of consumers such as lighting manufacturers and users, the multi-chip type has the advantage of less color difference between white LEDs and a wide heat dissipation surface. LED chips still have uneven wavelengths of light emission. By using a plurality of chips, the emission wavelength can be averaged, and the wavelength unevenness between the individual LED packages can be reduced. In addition, the LED chip is dispersed in the package, and heat concentration is less likely to occur, and the temperature rise can be easily controlled due to good heat dissipation.
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