Patent ID: 8379041

Claim:
A method for extending duration of a display apparatus having brightness compensation, comprising steps of: (a) providing a volatile memory for storing an m-bit accumulation value for the brightness compensation and an n-bit non-volatile memory; (b) selecting a p bit value as a virtual bit value; (c) dividing the n-bit non-volatile memory into a h-bit high-bit memory and a plurality of k 1 low-bit memories, wherein each of the k 1 memories is as long as j+p bits; (d) moving a part of the accumulation value for brightness compensation into the h-bit high-bit memory, where the part refers to data between m th bit of the accumulation value and (m−(h+j)+1) th bit; and (e) writing j-bit data (between (m−h) th bit˜(m−(h+j)+1) th bit) of accumulation value for brightness compensation and the p-bit virtual bit into first one of the k 1 low-bit memories, wherein, m, n, j, p, h, and k 1 are integers greater than zero.