Patent ID: 8040337

Claim:
A display device, comprising: a display panel; an environmental sensor; a correction circuit configured to generate a gamma correction for respective colors using a corrected gray-scale data on a basis of input gray-scale data; a driving circuit configured to drive said display panel in response to said corrected gray-scale data; a changeable gray-scale voltage generating circuit configured to generate a plurality of gray-scale voltages, which corresponds to a gamma curve with respect to a first gamma value of γ drive set in response to said output signal of said environmental sensor; and a correction data generating circuit configured to generate a first to a fourth correction data in response to said output signal of said of said environmental sensor, wherein said correction circuit generates said corrected gray-scale data by executing a correction using a polynomial in which said input gray-scale data are used as variables, wherein coefficients of said polynomial are changed in response to an output signal of said environmental sensor, wherein said polynomial comprises a quadratic polynomial with respect to said input gray-scale data, which is set such that a gamma correction, which corresponds to a gamma curve with respect to a second gamma value of γ logic , is approximately executed, wherein an entire gamma value of γ display is defined by a following formula: γ display =γ drive ×γ logic , said γ drive is set not to exceed said γ diplay , wherein a first polynomial, in which said input gray-scale data is used as a variable, is used as said polynomial, when a value of said input gray-scale data is in a first range, wherein a second polynomial, in which said input gray-scale data is used as a variable, is used as said polynomial, when said value of said input gray-scale data is in a second range, wherein said first polynomial is different from said second polynomial, said first range is different from said second range, and wherein coefficients of said first polynomial and said second polynomial are changed in response to said output signal of said environmental sensor, respectively, wherein when a maximum and a minimum of said D IN of said input gray-scale data are a D IN MAX and a D IN MIN , respectively, and a D IN Center , a middle of said D IN of said input gray-scale data, is defined by a following formula: D IN Center =( D IN MIN +D IN MAX )/2, a value in said first range is smaller than said D IN Center , and a value of said second range is larger than said D IN Center .