This invention provides a light-emitting diode which is capable of extracting white light, manufactured readily and highly reliable. Additionally, some arrangements of the tamping tool have a wear-resistant tip inserted into a groove in the end of the blade. A method of making the capillary structure according to the invention is also presented. Also, warped text may be accurately selected or \u201chit. The values of peaks which are obtained by sampling are averaged by an averaging circuit.