Under different working modes of a screen magnifier,seventy-two older participants finished 16 word search tasks.

Circuit design for LED large screen display;

The paper introduced display technology and application situation of several kinds of existing large screen digital jointing wall, and pointed that DLP technology was very suit with the requirement of uninterrupted work in dispatching department of coal mine, which was preferred product for coal industry in home.

With the substantial increase in rail transport volume,we has carried on the technological transformation of original dispatch supervision using large screen and computer network technology are used with coverage of stations from 14 to 20.

The realization of multi-windows display of LED large screen asynchronous controller;

The Design of LED Large Screen Video Display System with Colour VGA Synchronous;

In the paper, a design scheme of LED large screen display system is introduced, with Micro Controller 89C52 as the core of control circuit, and the mode of dynamic scanning of 16 lines for display in the drive circuit.