A method for use in a display panel comprising a plurality of pixels, each pixel comprising a R color sub-pixel, a G color sub-pixel, a B color sub-pixel and a W color sub-pixel, said display panel arranged to receive a plurality of input signals (dRi,dGi,dBi) for displaying an image thereon, and wherein said plurality of input signals are represented by N binary bits, with a maximum of the input signals equal to (2 N -1) with N being a positive integer greater than 1, and wherein said plurality of input signals comprises a R color input signal, a G color input signal, and a B color input signal, said method comprising: converting the input signals into a plurality of input data in luminance space (Ri,Gi,Bi) by normalizing the input signals and applying a gamma expansion to the normalized input signals, determining an adjustment value from the plurality of input data in luminance space; and computing a plurality of adjusted data values (R0,G0,B0,W0) from the plurality of input data in luminance space and the adjustment value, the plurality of adjusted data values comprising a R color adjusted data value, a G color adjusted data value, a B color adjusted data value and a W color adjusted data value in luminance space for use in one of the pixels, the R color, G color and B color adjusted data values corresponding respectively to the R color input signal, the G color input signal and the B color input signal, wherein the display panel has a color temperature characteristic, wherein the method further comprises: correcting the plurality of adjusted data values according to the color temperature characteristic of the display panel for providing a plurality of color-temperature corrected data (dRs',dGs',dBs',dWs') in luminance space, the color-temperature corrected data comprising a R color corrected data for use in the R color sub-pixel, a G color corrected data for use in the G color sub-pixel, a B color corrected data for use in the B color sub-pixel and a W color corrected data for use in the W color sub-pixel, wherein said determining and computing are carried out in a manner such that, when each of the R color input signal, the G color input signal and the B color input signal has the value of (2 N -1), each of the R color corrected data, the G color corrected data, the B color corrected data and the W color corrected data luminance space is smaller than or equal to 0.5, and wherein each of the R color sub-pixel, the G color sub-pixel, and the B color sub-pixel has an pixel area equal to a R color area, and the W color sub-pixel has a pixel area equal to k times the R color area, with k being a positive value greater than 0, and wherein k is selected such that, when each of the R color input signal, the G color input signal and the B color input signal has the value of (2 N -1), each of the R color corrected data, the G color corrected data, the B color corrected data and the W color corrected data in luminance space is smaller than or equal to 0.5/k and greater than or equal to 0.4/k. converting the input signals into a plurality of input data in luminance space (Ri,Gi,Bi) by normalizing the input signals and applying a gamma expansion to the normalized input signals, determining an adjustment value from the plurality of input data in luminance space; and computing a plurality of adjusted data values (R0,G0,B0,W0) from the plurality of input data in luminance space and the adjustment value, the plurality of adjusted data values comprising a R color adjusted data value, a G color adjusted data value, a B color adjusted data value and a W color adjusted data value in luminance space for use in one of the pixels, the R color, G color and B color adjusted data values corresponding respectively to the R color input signal, the G color input signal and the B color input signal, wherein the display panel has a color temperature characteristic, wherein the method further comprises: correcting the plurality of adjusted data values according to the color temperature characteristic of the display panel for providing a plurality of color-temperature corrected data (dRs',dGs',dBs',dWs') in luminance space, the color-temperature corrected data comprising a R color corrected data for use in the R color sub-pixel, a G color corrected data for use in the G color sub-pixel, a B color corrected data for use in the B color sub-pixel and a W color corrected data for use in the W color sub-pixel, wherein said determining and computing are carried out in a manner such that, when each of the R color input signal, the G color input signal and the B color input signal has the value of (2 N -1), each of the R color corrected data, the G color corrected data, the B color corrected data and the W color corrected data luminance space is smaller than or equal to 0.5, and wherein each of the R color sub-pixel, the G color sub-pixel, and the B color sub-pixel has an pixel area equal to a R color area, and the W color sub-pixel has a pixel area equal to k times the R color area, with k being a positive value greater than 0, and wherein k is selected such that, when each of the R color input signal, the G color input signal and the B color input signal has the value of (2 N -1), each of the R color corrected data, the G color corrected data, the B color corrected data and the W color corrected data in luminance space is smaller than or equal to 0.5/k and greater than or equal to 0.4/k.