Disclosed is a material for a light emitting device excellent in color purity, good in light emitting characteristics and excellent in stability, which consists of a compound represented by the following general formula :. The display panel emits a green light having a green energy and a green point of the CIE 1931 xy chromaticity under the operation of the highest gray level of a green image, and emits a blue light having a blue energy and a blue point of the CIE 1931 xy chromaticity under the operation of the highest gray level of a blue image. Various embodiments of the present invention allow various devices to be shipped from the factory with low-level software already built in so that users are liberated from having to deal with the experience of installing and upgrading device drivers. A device may include a clock generator, one or more divider, and one or more delay cells internally to the device. Step 4 inserts the terminal piece into a connector housing. A precise discharge metering orifice is provided in the valve body as a substitution for proportioners which are normally located downstream of the dispensing system.