US 9,814,109 B2
Apparatus and technique for modular electronic display control
Tushar Heramb Dhayagude, Santa Clara, CA (US); Dilip Sangam, Saratoga, CA (US); Hendrik Santo, San Jose, CA (US); and Anjan Sen, San Jose, CA (US)
Assigned to Atmel Corporation, San Jose, CA (US)
Filed by Tushar Heramb Dhayagude, Santa Clara, CA (US); Dilip Sangam, Saratoga, CA (US); Hendrik Santo, San Jose, CA (US); and Anjan Sen, San Jose, CA (US)
Filed on Nov. 19, 2007, as Appl. No. 11/942,239.
Prior Publication US 2009/0128053 A1, May 21, 2009
Int. Cl. H05B 33/08 (2006.01); G09G 3/20 (2006.01); G09G 3/34 (2006.01)
CPC H05B 33/0827 (2013.01) [G09G 3/2085 (2013.01); G09G 3/2088 (2013.01); G09G 3/3426 (2013.01); H05B 33/0851 (2013.01); G09G 2320/029 (2013.01); G09G 2320/04 (2013.01); G09G 2320/064 (2013.01); G09G 2330/021 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A display comprising:
light emitting diodes (LEDs) arranged in a plurality of LED strings, wherein each LED string includes a plurality of LEDs, the plurality of LED strings divided among a plurality of sections of the display;
a system controller configured for controlling a timing of the display; and
a different local controller assigned to each section of the display and configured for controlling LED strings in the section of the display by:
receiving feedback signals from the plurality of LED strings included in the section;
based on receiving the feedback signals, selecting a lead string for the section from the plurality of LED strings, the lead string being a LED string with a forward voltage that is greater than forward voltages of other LED strings in the section;
determining a current flowing through the lead string for the section;
in response to determining the current flowing through the lead string, determining a drive voltage to be provided to the lead string to generate a target current in the lead string; and
providing the determined drive voltage to the plurality of LED strings in the section,
wherein a reference signal from the system controller is utilized for synchronizing operation of the local controller with the system controller.