The displaying interface of 8279 and the characteristics of 8- and 16-segment LED displaying and driving circuit are analyzed in the paper. The displaying and driving method of 8-segment LED mixed with 16-segment LED is presented and an economical and practical displaying circuit is introduced.
The paper introduced development situation of LED video display technology at present and development trend in the country, and present mainly LED video display systemic structure and primary technology principle, such as principle of systemic display, realization of dot-matrix devices circuit, LED display screen display structure, and display feature.
The system uses two frame display buffers: A and B. When 89C52 is writing the display data into buffer A, one automatic address producer produces buffer B's address signal and reads B's data to be sending to the display screen. The "read" and "write" processes of A and B work at the same time and in turn. LED display screen with larger size is realized by common MCU.
Experiments on distance perception of stereoscopic targets have been conducted with the stereoscopic LED displays using parallax barriers, as well as a stereoscopic LED display using polarizing eyewear.
The small size, only four command switches and the six-digit LED display for parameter presentation make the instrument easy for use in the clinic.
You might note that the LED display does not form every character of the alphabet completely, so you have to do a little creative interpretation.
You will see this as you view the pictures of the LED display as you review these instructions.
A hard event will be evident by a solid pulsing of the converter and a brief flash of digit on the LED display.