Splicing screen, method for determining address of each splicing screen unit and master control board

A master control board for each splicing screen unit of a splicing screen that comprises:

• a plurality of splicing screen units which are spliced together;
• wherein each splicing screen unit comprises a master control board, a gravity sensor coupled with the master control board, infrared emitters and infrared receivers;
• wherein the infrared emitters and the infrared receivers are divided into four groups each comprising one infrared emitter and one infrared receiver;
• the four groups are at four sides including top, bottom, left and right sides of each splicing screen unit, respectively;
• wherein two groups at adjacent sides of adjacent two splicing screen units, have an identical horizontal position or an identical vertical position;
• wherein in adjacent two splicing screen units, signal is capable of being transmitted among infrared emitters and infrared receivers of only two groups at adjacent sides of adjacent two splicing screen units;
• wherein the master control board includes:
• an installation mode determination unit configured to determine an installation mode of the splicing screen unit based on data obtained from the gravity sensor of the splicing screen unit;
• a sending unit configured to send a command for acquiring address to each infrared emitter of the splicing screen unit;
• a first-row-first-column determination unit configured to receive address data sent from the infrared receivers of the splicing screen unit, and determine whether the splicing screen unit is in the first row and the first column according to the address data and the installation mode;
• wherein the address data from one infrared receiver indicates a position of the one infrared receiver and is obtained by the one infrared receiver according to a command for acquiring address received by the one infrared receiver from one infrared emitter at an adjacent side of an adjacent splicing screen unit;
• and
• an address determination unit configured to, when determining that the splicing screen unit is in the first row and the first column, send an address identification command of the splicing screen unit to an adjacent splicing screen unit in an adjacent row and an adjacent splicing screen unit in an adjacent column;
• when determining that the splicing screen unit is not in the first row and the first column, determine an address of the splicing screen unit according to address identification commands received from adjacent splicing screen units in an adjacent row and/or an adjacent column as well as the address data sent from the infrared receivers in the splicing screen unit, and send an address identification command carrying address information of the splicing screen unit to an adjacent splicing screen unit in an adjacent row and an adjacent splicing screen unit in an adjacent column.