| Summary: | 碩士 === 國立屏東科技大學 === 機械工程系所 === 100 === In this paper, we propose a procedure to adjust the chromatic coordinates by using a few samples of the color measurement coordinate to do the error correction and choose the correction method of minimum color error difference average to be the procedure of measuring instruments, and to construct an efficient and predictable calibration procedure. This reasearch adopts some engineering statistics methods, such as median and average methods, and corrects the experiments to obtain the chromaticity coordinates. Through observing the distance from the calibrated points to the correct points on the chromaticity coordinates and estimating the relation of color errors, the reseacher finds that the central-point calibration gets average value of the color errors as 0.039, while the seven calibration methods that we designed lower the average value of the color errors as 0.034. Moreover, the minimum average value of errors in the X-axis could be revised to 6.3% while the minimum average value of errors in the Y-axis 7.4%. The accuracy of best calibrated chromaticity coordinates could achieve to the percentage 72%. The experiment result shows that using the color error average calibration method to revise the experiment value obtains best calibrated value.
By using the seven kinds of calibration methods and writing the LabVIEW softwares, we could design the LED chromaticity coordinate calibration program, find out the best calibration method with the minimum color errors, and then use this method to do the instrumental measurements and construct the prediction modes. In order to precisely measure the LED device, this research adopts the integrating sphere to set up the uniform light measuring environment as well as the spectrometer, color sensors and data acquisition equipments to assemble the LED optoelectronic measurement mechanism. First, we power up the LED then the color sensor senses the colors and produce a small current. Later, the signal will be amplified by the amplifing current set and sent to a data catcher. This conducts the calculating through PC as the interface, which enables the human-PC interface automatic optoelectronic measuring instruments to enhance the calibration and prediction function and to enforce the functions of automatic measurements.
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