| 摘要 |
PURPOSE:To obtain video signals with excellent picture quality at a high transfer efficiency, by providing bias charges of >=2 sets for a CTD in response to one vertical signal output line and using one for the sweep-out of a virtual signal and the other for the readout of the signal charges. CONSTITUTION:A bias charge 44 out of bias charges 43, 44 and 43' stored in advance under storage electrodes 41, 45 and 47 of the CTD is first applied to a vertical signal output line 26 to sweep out a virtual signal such as smear leaked on the line 26 to the CTD. Thus, the electric charges comprising the bias charges and the virtual signal are swept out in a drain 31. The bias charge 43 under the adjacent electrode 41 is transferred under the electrode 45 and this charge is used for the readout of the signal charges by taking the charge as the bias charge. Thus, the charges are transferred very efficiently and smoothly, and the generation of fixed pattern noise due to the dispersion in threshold voltage and transfer rate of horizontal switches 28 and 29. |
