Abstract: An overdrive circuit (20) for a display panel (1) comprising a pixel (10) having inertia further comprises a table look up circuit (24) or a function circuit (24) which receives a start value (SV) and a desired value (DV) being either an input value (IV) indicating an image to be displayed, or a clipped value (CV) and which supplies an overdrive value (OV) to the pixel (10). A substituting circuit (30) substitutes the input value (IV) by a reachable response within one predetermined period (Tf) starting from the start value (SV) to obtain the clipped value (CV). A memory (23) receives the clipped value (CV) to supply the start value (SV) which is the clipped value (CV) delayed over the one predetermined period (Tf).

Abstract: The invention relates to a color display device for display a color image and a method of operating such display. The color display device is provided with a plurality of picture elements, two selectable light sources having different predetermined radiance spectra, color selection means which in combination with the selectable light sources is able to produce respective first and second primary colors on the display panel and control means arranged to select alternately one of the selectable light sources and to provide a portion of the picture elements with image information corresponding to the respective primary colors obtainable with the selected light source. The primary colors of the display device can be selected in a time sequential and space sequential way which enable a reduction of a color break-up.

Abstract: A method of redistributing an N-primary color input signal (IS) having a particular number?4 (N) of input components (I1, . . . , IN) into N-primary color output signal (OS) having the particular number (N) of output components (P1, . . . , PN) under a constraint (CON2). The method comprises defining (MPRC) three functions (F1, F2, F3) representing three (P1, P2, P3) of the output components (P1, . . . , PN) as a function of the remaining N-3 output components (P4, . . . , PN). Substituting (MPRC) the values of the input components (I1, . . . , IN) into the three functions (F1, F2, F3) to determine unknown coefficients (P1?, P2?, P3?) of the three functions (F1, F2, F3). And, determining (MPRC) optimal values of the output components (P1, . . . , PN) by applying the constraint (CON2) to the three functions (F1, F2, F3).

Abstract: A method of converting a three-primary input color signal (IS) comprising three input components (R, G, B) per input sample into an N-primary color drive signal (DS) comprising N?4 drive components (D1, . . . , DN) per output sample for driving N sub-pixels (SP1, . . . , SPN) of a color additive display. The N sub-pixels (SP1, . . . , SPN) have N primary colors. The method comprises adding (10), to three equations defining a relation between the N drive components (D1, . . . , DN) and the three input components (R, G, B), at least one linear equation defining a value for a combination of a first subset of the N drive components (D1, . . . , DN) and a second subset of the N-drive components (D1, . . . , DN) to obtain an extended set of equations. The first subset comprises a first linear combination (LC1) of 1?M1<N of the N drive components (D1, . . . , DN), and the second subset comprises a second linear combination (LC2) of 1?M2<N of the N drive components (D1, . . . , DN).

Abstract: A method of mapping a four primary input signal (IS) to sets (Pij) of four sub-pixels (RPij, GPij, BPij, WPij) of a display device (DD). The four primary input signal (IS) comprises a sequence of input samples (Sij) each comprising a value for a first input signal (Rlij), a value for a second input signal (Glij), a value for a third input signal (Blij), and a value for a fourth input signal (Wlij). The sets (Pij) of the four sub-pixels comprise a first sub-pixel (RPij) to supply light having a first primary color (R), a second sub-pixel (GPij) to supply light having a second primary color (G), a third sub-pixel (BPij) to supply light having a third primary color, and a fourth sub-pixel (WPij) to supply fourth light having a fourth color (W), the first, second, third and fourth color all being different, and the fourth color being within the color gamut of the first, second, and third color.

Abstract: A driver (DD, SD, PD1, PD2) drives a display panel which comprises a first set of light emitting elements (PL1) and a second set of light emitting elements (PL2). The driver (DD, SD, PD1, PD2) comprises a data driver (DD) which receives a first set of input image signals (R) representing a first color to supply a first set of data signals (RD 1) to the first set of light emitting elements (PL1), respectively. The data driver (DD) further receives a second set of input image signals (B) representing a second color to supply a second set of data signals (BD1) to the second set of light emitting elements (PL2), respectively. A lowpass filter (LPF) is provided to obtain the second set of data signals (BD1) having a bandwidth being smaller than a bandwidth of the first set of data signals (RD1).

Abstract: In a method, a display device and a computer program product that reduces motion blur, flicker and loss of brightness of images shown in non-stroboscopic display devices, such as Liquid Crystal, Plasma Panel, Thin Film Transistor, Liquid Crystal on Silicon, color Sequential, Organic Light Emitting Diode or Polymer Light Emitting Diodes displays, in which each image of an input video signal is displayed during a display time ti, which is less than or equal to a picture period T, the motion and the characteristics of motion are measured and the display time ti is continuously adjusted between 0 and T depending on this measured motion and the characteristics of motion. To further reduce flicker and loss of brightness encountered when reducing the display time, anti-motion blur filtering of the input video signal is performed, where the display time and the amount and sort of filtering is jointly controlled based on the measured motion and characteristics of motion.

Abstract: A method of displaying an image, wherein a first density of image pixels, each comprising a sub-pixel is displayed on a display having a second density of display pixels. Each display pixel has at least two spatially offset display sub-pixels. The display sub-pixels are able to display a first color and a second color, respectively. According to the invention, the image is resized to an intermediate image having a third density of intermediate image pixels, each comprising an intermediate image sub-pixel, and the display sub-pixels are displayed with a respective intensity which is determined from the corresponding intermediate image sub-pixels. This reduces the image artifacts when the display screen is used with different image standards.

Abstract: A method, a circuit arrangement and a display device which suppresses motion blur due to motion integration carried out along a motion trajectory on the image data, which occurs in matrix type displays in which a motion trajectory is integrated by the viewer and/or the display, includes an inverse integration filtering of the video signal. To avoid de-blurring in image regions where motion cannot be detected, or image is low and to avoid noise modulation, motion estimation as well as further image characteristic are used.

Abstract: By taking into account the individual positions of the sub-pixels (108-118) on a color matrix display device (100); the apparent resolution can be increased. Sub-pixel sampling to determine samples at the correct position is incorporated in the image scaling filter (502). The filter response is such that the useful resolution inherent in the color matrix display device (100) can be used. In the filter design, a trade-off is made between sharpness and color errors.

Abstract: A display unit displays an image on a display screen like a plasma display panel in a number of sub-fields. The display unit is arranged to control the intensity values of one of the color values of a pixel, in particular to control whether the highest weighted sub-field is switched on or off, by changing that color signal. The effect of this change on the luminance of the pixel is compensated by a change to one or both of the other color signals.

Abstract: The image processing unit (200,201,203,205,207) comprises an extension unit (208) for extending a first image (110) at a side of the first image (110) with pixels of a second image (108) based on a second set of motion vectors (212). The image processing unit (200,201,203,205,207) further comprises a motion estimation unit (204) for estimating a first set of motion vectors (210) of pixels corresponding to a first portion (105) of a scene (100) which is visible in the first image (110) and a second image (108), and a motion extrapolation unit (206) for estimating the second set of motion vectors (212) of pixels corresponding to a second portion (103) of the scene (100) which is visible in the second image (108), but invisible in the first image (110), based on the first set of motion vectors (210).

Abstract: The invention relates to a method, a circuit arrangement and a display device which suppresses motion blur due to motion integration carried out along a motion trajectory on the image data. As in matrix type displays a motion trajectory is integrated by the viewer and/or the display, an inverse integration filtering of the video signal is carried out. To avoid de-blurring in image regions where not motion can be detected, or image detail is low and to avoid noise modulation, motion estimation as well as further image characteristics are used.

Abstract: A display device (806) is driven by a video processing unit (804) in a number of sub-fields, each for outputting a respective illumination level by the display device. In each sub-field, a pixel of the displayed image may emit an amount of light corresponding to the particular sub-field, depending on whether it is switched on or not. Based on motion estimation, the desired intensity level of a particular pixel at the time point corresponding with the current sub-field is calculated. Subsequently, it is determined how much light has been generated by the pixels along the motion vector of the particular pixel and accumulated in the eye of a human observer. Then a target intensity level is calculated on the basis of the desired level and the already accumulated level. Based on this target level it is decided whether the particular pixel is to be lit in the current sub-field.

Abstract: A method of displaying an image, wherein a first density of image pixels, each comprising a sub-pixel is displayed on a display having a second density of display pixels. Each display pixel has at least two spatially offset display sub-pixels. The display sub-pixels are able to display a first color and a second color, respectively. According to the invention, the image is resized to an intermediate image having a third density of intermediate image pixels, each comprising an intermediate image sub-pixel, and the display sub-pixels are displayed with a respective intensity which is determined from the corresponding intermediate image sub-pixels. This reduces the image artifacts when the display screen is used with different image standards.

Abstract: A display unit displays an image on a display screen like a plasma display panel in a number of sub-fields. The display unit is arranged to control the intensity values of one of the color values of a pixel, in particular to control whether the highest weighted sub-field is switched on or off, by changing that color signal. The effect of this change on the luminance of the pixel is compensated by a change to one or both of the other color signals.