Researchers Submit Patent Application, "Method of Manufacturing Light Emitting Device and Phosphor-Containing Fluid Resin Dispensing Apparatus", for Approval
The patent's assignee for patent application serial number 735754 is
News editors obtained the following quote from the background information supplied by the inventors: "A light emitting diode (hereinafter, referred to as an 'LED') is a semiconductor device which converts electrical energy into optical energy and comprises a compound semiconductor which emits light of a particular wavelength according to an energy band gap. The use of LEDs has become widespread in back light units (BLU) of display devices such as an optical communications display or a mobile display device, a computer monitor, or the like, for a liquid crystal diode (LCD), and as a general illumination device.
"In order to provide white light, LED packages include a suitable wavelength conversion unit. However, even when a light emitting package is manufactured through a single process, there may be an occurrence of white light having different color properties. This variation in color properties may be due to a process error during the formation of a wavelength conversion unit. As a consequence, defects such as irregular color scattering may occur.
"In some cases, light emitting diode packages may provide white light that deviates from the range of conditions of required target color properties,thereby resulting in defective light emitting diode packages and decreased production yields."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "An aspect of the present disclosure provides a method of manufacturing a light emitting device, capable of providing white light satisfying target color properties while significantly reducing a drop in production yield through a simplified process.
"An aspect of the present disclosure provides a method of manufacturing a light emitting diode (LED) package, including dispensing a predetermined discharge amount of a phosphor-containing fluid resin to at least one LED package, and measuring color coordinates of white light emitted from the at least one LED package. The method includes adjusting the discharge amount of the phosphor-containing fluid resin based on a deviation between the measured color coordinates and target color coordinates. The method further includes dispensing the adjusted discharge amount of the phosphor-containing fluid resin to another LED package.
"The method may also include curing the phosphor-containing fluid resin dispensed to the another LED package.
"The measuring of the color coordinates may be performed before the dispensed phosphor-containing fluid resin is cured.
"The LED package may include a blue LED chip, and the phosphor-containing fluid resin may include at least one of a yellow phosphor and a mixture of red and green phosphors. In this case, the adjusting of the discharge amount of the phosphor-containing fluid resin may be performed to increase the predetermined discharge amount when the deviation corresponds to a blue shift and to reduce the predetermined discharge amount when the deviation corresponds to a red shift or yellow shift.
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