Patent ID: 7834889
Filing Date: 2010-11-16
Classification: G09G

Abstract:
1. A data conversion circuit for generating conversion data from a set of input data, each of the set of input data comprising a signal level selected from a plurality of allowable levels including representative levels, the conversion circuit comprising: a look-up table (LUT) that stores output data including representative correction values corresponding to combinations of the representative levels of the set of input data in at least one of two- and three-dimensionally arranged cells, the cells including diagonal cells arranged on a diagonal line of the LUT and a plurality of pairs of adjacent cells, each of the pairs of adjacent cells being arranged symmetrically along both sides of the diagonal line; and an interpolation circuit that generates the conversion data by interpolating from the representative correction values stored in the cells of the LUT that surround an address corresponding to a combination of the signal levels of the set of input data, wherein: the representative correction values stored in the diagonal cells indicate that no conversion is made; the representative correction values stored in at least one of the pairs of adjacent cells have mutually opposite signs and different absolute values; and the interpolation circuit substitutes, when the cells that surround the address includes the at least one of the pairs of adjacent cells, one of the representative correction values stored in the adjacent cells with a substituted representative correction value having a sign opposite to and an absolute value same as those of the other one of the representative correction values stored in the adjacent cells, and then generates the conversion data using the substituted representative correction value.