Picture display device suitable for displaying an oscilloscopic image on a display screen for displaying a picture formed line and field sequentially.

摘要

Due to a location-dependent, determined brightness drive of pixels in the picture formed line and field-sequentially, it is possible to obtain an oscilloscopic image in the form of a waveform profile on a display screen (TV, OSC). A digital signal comparison circuit (COMP) having a first input (I1) for applying localizing information in the form of an actual line number (L-act) and a second input (I2) for applying digital values of the waveform profile to be displayed from a line buffer circuit (W-buf) supplies a binary drive signal (BDS) to an output. The line buffer circuit (W-buf) is filled from a digital picture source (DPS) via a series arrangement of a line buffer circuit (L-buf) for storing the picture information associated with a selected line having a selectable first line number (L-sel), a multiplier or divider circuit (SCAL) for obtaining picture line strips with different picture line numbers via selectable factors (W-fac) for displaying the waveform profile on different scales, and a subtractor circuit (SUB) for moving, as desired, the bottom line of the display strips with the different heights by means of a selectable second line number (L-bot). The digital picture display device described provides an accurate localization for the movable waveform profile which can be observed on the desired scale.