DEVICE FOR DETERMINING THE CONTRAST OF A DISPLAY SCREEN BASED ON THE OBSERVATION DIRECTION

摘要

P DEVICE FOR DETERMINING THE CONTRAST OF A DISPLAY SCREEN IN ACCORDANCE WITH THE OBSERVATION DIRECTION. / P P THIS DEVICE COMPRISES A FIRST CONVERGENT OBJECTIVE 12 FOR FORMING THE IMAGE 19 OF THE TRANSFORMATION OF THE DISPLAY FOURIER OF AN ELEMENTARY SURFACE 9 OF THE SCREEN 6 IN THE FOCAL IMAGE FIELD OF THE FIRST OBJECTIVE; A second convergent lens 14 for projecting the image of the transformer onto a set 16 of detectors 18 arranged in a matrix, each detector producing an electrical signal proportional to the luminous intensity resulting from the elementary surface according to a determined direction of observation; A DIAPHRAGM 20 LOCATED NEAR THE SECOND OBJECTIVE WHICH OPENING DEFINES A SURFACE THAT MUST BE EQUAL TO THAT OF THE ELEMENTARY SURFACE, MEANS OF PROCESSING 22 OF THE ELECTRICAL SIGNAL PRODUCED BY EACH DETECTOR IN ORDER TO DETERMINE THIS CONTRAST. / P