Patent Number: 7,612,831

Title: Gamma correction device, image conversion apparatus using the same, and display device

Abstract: There are provided a gamma correction device enabling correct gamma correction while reducing the capacity of a lookup table, an image conversion apparatus and a display device using the same. A gamma correction device for outputting, as an m-bit signal, a digital input signal having been inputted as an n-bit signal, m being a given number, the gamma correction device including a high-order LUT, a low-order LUT, a difference LUT, a data connecting section 2, and an adder 3, wherein each of the lookup tables has input bits fewer than n and output bits fewer than m, the high-order LUT has x-bit input and m1-bit output, the low-order LUT has (n-t)-bit input and m2-bit output, the difference LUT has (n-t)-bit input and k-bit output, m.ltoreq.m1+m2, x<n-t and m.gtoreq.m1+k are established, the data connecting section 2 outputs connection data obtained by connecting output bits of the high-order LUT on the high-order bit side and output bits of the difference LUT on the low-order bit side with m-m1-k bits of "0" being interposed between the output bits, and the adder 3 adds the connection data and the output value of the low-order LUT and outputs the added data.

Inventors: Miyasaka; Daigo (Tokyo, JP)

Assignee: NEC Corporation

International Classification: H04N 5/202 (20060101)

Expiration Date: 1/03/02017