Patent ID: 7126563

Claim:
A brightness correction apparatus of a plasma display, of which a brightness error of ideal display brightness and actual display brightness for each gray scale has been established, the apparatus comprising; an inverse γ conversion lookup unit, to receive an input signal of a currently displaying pixel, and to convert the input signal into a first gray scale data to be output according to an inverse γ conversion rule; an error diffusion unit, coupled to the inverse γ conversion lookup unit to receive the first gray scale data, and to modify the first gray scale data into a second gray scale data recorded as a display brightness error of the currently displaying pixel by considering a display brightness error of a neighboring pixel of the currently displaying pixel; and a gray scale lookup unit, coupled to the error diffusion unit to receive an integral portion of the second gray scale data, and to look up a gray scale allocation table to obtain a sustain pulse number of the currently displaying pixel, wherein the error diffusion unit further comprises; an adder, to receive the first gray scale data to obtain the second gray scale data by summing the first gray scale data and a weighted display brightness error of the neighboring pixel; a brightness error lookup circuit, coupled to the adder to receive the integral portion of the second gray scale data, and to look up a brightness error table to obtain the brightness error of the currently displaying pixel, wherein the brightness error table includes a lookup table for the integral portion of the second gray scale data G and the brightness error E, and the brightness error table is established by an actual measured gray scale function of brightness B 0 (G) and an ideal gray scale function of brightness B(G) as E=[(B(G)-B(G 0 ))/B 0 (G)]*G; and a weighted error supply circuit coupled to the adder and the brightness error lookup circuit to save the brightness errors of the sequentially displayed currently displaying pixel and the neighboring pixel as the display brightness errors thereof, and to weight the display brightness error of the neighboring pixel to obtain the weighted display brightness error required by the adder.