Patent ID: 7812792

Claim:
An electron emission display device comprising: a display region comprising a plurality of scanning lines and a plurality of data lines; a plurality of pixels arranged in regions defined by the scanning lines and the data lines; a data driving unit for transmitting a data signal to the data lines; a scanning driving unit for transmitting a scanning signal to the scanning lines; and a controlling unit for identifying display data for indicating a brightness displayed by the pixels, for separately determining a compensation coefficient for each of the pixels, and for correcting input data input into each of the pixels; wherein the input data for each of the pixels is corrected in the controlling unit by multiplying the compensation coefficient by the input data, wherein the controlling unit comprises: a display data detecting unit for randomly selecting at least two and less than all of the pixels to detect the display data of the selected pixels; a compensation coefficient setting unit for setting the display data of at least one of the selected pixels as reference display data, and setting compensation coefficients so that the input data of the pixels other than the at least one of the selected pixels can be corrected based on the reference display data; and a correction unit for correcting the input data by multiplying the compensation coefficients by the input data, and wherein the compensation coefficient of each of the pixels is in the form of a first constant value divided by a second constant value, the second constant value being greater than one or less than one.