Implementation of the Gamma (γ) Line System Similar to Non-linear Gamma Curve with 2bit Error(LSB)

Gamma correction is an essential function in every display device such as CRT, plasma TV, and TFT LCD. (Po-Ming Lee, 2005) proposed gamma (γ) correction systems are developed to reduce the difference between non-linear gamma curve produced by a typical formula and result produced by the proposed algorithm. The proposed algorithms and systems are based on the specific gamma value such as 2.2, namely the formula, f(x)=x^γ and the bit width of input and out data is 10bit. In order to reduce the difference, the proposed system is using the least squares polynomial which is calculating the best fitting polynomial through a set of points which is sampled. System are consisting of continuous several kinds of equations and having their own overlap sections to get more precise. Based on the algorithm verified, the systems are implemented by using Verilog-HDL. This paper compares the latest algorithm such as proposed system with the previous that of gamma system such as existing system. The former and the latter system have 2, 2 clock latency; each 1 result per clock. Each of the error range (LSB) is -1~+1, -3~+4. Under the condition of SAMSUNG STD90 0.35 worst case, each gate count is 2,564, 2,083 gates and each maximum data arrival time is 17.52,15.56 [ns], respectively