Display system for photographic camera

Claim 1

A display system adapted for use in conjunction with an automatic exposure control system of a camera of the type having a shutter preselection and a diaphragm preselection automatic exposure control modes comprising; a. a first group of registers for storing the preselected exposure control parameter in binary coded decimal form, b. a second group of registers for storing the computed result in binary coded decimal form, c. timing pulse generating means, d. a multiplexer connected to said first and said second groups of registers and receptive of the timing pulses from said timing pulse generating means for causing the data stored in said first and second groups of registers to be read out in sequence, e. a decoder for converting the outputs of said multiplexer to corresponding coded signals for display, f. digital readout means comprises of an array of display elements for displaying digit characters corresonding to the outputs of said decoder, g. preference signal generating means having shutter preference signal generating means and diaphragm preference signal generating means, and h. display control means cooperative with said timing pulse generating means for controlling the sequence of operation of said display elements in a selected program; said control means including means for selecting one of two programs in response to occurrence of the signal from said preference signal generating means, whereby the digit characters of the preselected exposure control parameter are displayed in constant positions relative to those in which the digit characters of the computed result are displayed regardless of which mode is rendered operative.