Patent ID: 9384689
Filing Date: 2016-07-05
CPC Classification: G02F,G09G

Claim Text:
1. A viewing angle characteristic improving method in a liquid crystal display device including a liquid crystal panel having three color filters of red, green, and blue which are different from one another in thickness, the viewing angle characteristic improving method comprising: a characteristic acquisition step of acquiring a gradation-transmittance characteristic indicating a relationship between a gradation value and a transmittance regarding each of the three color filters when the liquid crystal panel is viewed from an oblique direction; a transmittance approximation range defining step of determining a transmittance approximation range, which is a range of the gradation value in which a difference between a maximum value and a minimum value among three transmittances corresponding to each of the gradation values is minute, based on the gradation-transmittance characteristic; a parameter determining step of determining a white balance parameter for adjusting white balance of the liquid crystal panel so as to correspond to each of the gradation values for each of red, green, and blue colors; and a white balance adjustment step of correcting the gradation value of each of the colors based on an input image signal supplied to the liquid crystal display device, by using the white balance parameter determined in the parameter decision step, wherein in the parameter determining step, the white balance parameter is determined so that the correction of the gradation value in the white balance adjustment step causes the gradation value within the transmittance approximation range to be a maximum gradation value of each of the colors in the characteristic acquisition step, a plurality of gradation-transmittance characteristics corresponding to oblique views from a plurality of directions are acquired, and when the transmittance approximation range determined based on each of the gradation-transmittance characteristics is defined as a single direction transmittance approximation range, in the transmittance approximation range defining step, an overlap of the plurality of single direction transmittance approximation ranges determined based on the plurality of gradation-transmittance characteristics is defined as the transmittance approximation range to be referred to in the parameter determining step.