Patent ID: 8780133

Claim:
A display apparatus comprising: a display panel having a display area substantially populated by a repeating group having a plurality of differently colored subpixels, the repeating group including white subpixels and the repeating group having a first subset of its subpixels defining a first class of off-white dot pixels and a second subset of its subpixels defining a second class of differently off-white dot pixels, where respective and immediately adjacent ones of dot pixels of the first and second off-white dot pixel subsets define a respective metameric set of dot pixels such that, when the subpixels of the metameric set are all lit, they create a perception of a white lit region on the display panel in the region of the lit-up metameric set of dot pixels and when all are un-lit, they create a perception of a corresponding black region on the display panel in the region of the un-lit metameric set of dot pixels; a light source part configured to provide backlighting light to the display panel; and a data processing circuit that is configured to automatically force a first metameric set of dot pixels to a predetermined black grayscale level in response to automated detection of presence of a horizontal or vertical, near-black line being present in a supplied input signal defining a to be displayed image, the first metameric set of dot pixels including red and green subpixels or blue and white subpixels, the data processing circuit being configured to set the red and green subpixels or the blue and white subpixels to the predetermined black grayscale level based on red, green and blue data, and the data processing circuit comprising: a gamut mapping part configured to map color components of the supplied input signal into a gamut space defined by the subpixels of said repeating group that substantially populates the display area of the display panel, the gamut mapping part being configured to map the red, green and blue data into red, green, blue and white data; a subpixel rendering part configured to automatically reconstruct the gamut mapped color components for distributed reproduction by light outputting source points of the display area that is substantially populated by said repeating group, where the automatic reconstruction is based on an area resampling algorithm; a first memory buffer configured to store the red, green and blue data before mapping into red, green, blue and white data; and a black re-establishing part configured to set the red and green subpixels or the blue and white subpixels to the predetermined black grayscale level based on red, green and blue data stored in the first memory buffer.