| 摘要 |
PURPOSE:To reduce the cost of the light reception part of an image pickup means and to display an object of low luminance by changing the frequency of a reference clock based on the object luminance measured by a light measuring means to change the frequency of a driving signal of the image pickup means, a display means, or the like. CONSTITUTION:An AE sensor 26 measures the luminance of the object to output a signal indicating the object luminance to a reference frequency generating circuit 28. This circuit 28 changes the reference frequency in accordance with this signal, and a synchronizing circuit 18 outputs a reference clock fck and horizontal and vertical synchronizing signals VD and HD obtained by frequency division of this clock fck to a CCD driver 14. Consequently, a read pulse phiTG, a vertical driving pulse phiV, and a horizontal driving pulse phiH outputted from the CCD driver 14 are synchronously controlled. Synchronizing signals outputted to a signal processing circuit 16 for display and an X driver are controlled based on the frequency of the reference clock fck. Thus, the cost of the light reception part of an electronic finder is reduced, and the object of low luminance can be displayed. |
