摘要:
Light-emitting devices (100) and methods for operating light-emitting devices are disclosed. Each of the light-emitting devices (100) comprises a plurality of light sources (112A-112F) for illuminating a target (120), wherein each of the light sources is configured to emit light within a predetermined color range. Each of the light-emitting devices comprises means (140) for automatically adjusting the spectral power distribution of light-emitted by the light-emitting device on basis of the color of the target or a region of the target illuminated by the light-emitting device, such that light emitted by the light-emitting device is made increasingly compliant or even compliant with a criteria of a predetermined color characteristics.
摘要:
Light-emitting devices (100) and methods for operating light-emitting devices are disclosed. Each of the light-emitting devices (100) comprises a plurality of light sources (112A-112F) for illuminating a target (120), wherein each of the light sources is configured to emit light within a predetermined color range. Each of the light-emitting devices comprises means (140) for automatically adjusting the spectral power distribution of light-emitted by the light-emitting device on basis of the color of the target or a region of the target illuminated by the light-emitting device, such that light emitted by the light-emitting device is made increasingly compliant or even compliant with a criteria of a predetermined color characteristics.
摘要:
A multi-primary conversion method is disclosed for converting an input vector defining a color of an input pixel in a Linear color space into a drive vector having n components for driving “n” display primaries of a display color space. The drive vector comprises m sub-drive vectors for driving m groups of the display primaries.
摘要:
A method of dynamic gamut control is disclosed. In accordance with a first aspect of the invention, control of the intensities of a set of color primaries illuminating associated sub-pixels of a display device is disclosed. Thus, the intensities of the light sources are controlled to control the intensities of the color primaries after the color filters. The method searches for a minimal intensity value of one color primary, which is adjusted to obtain together with the other color primaries of the set of color primaries an adjusted color gamut still containing all the colors of the set of colors.
摘要:
A color display device, a drive circuit for a color display device, a method, a signal and a computer-readable medium for reducing electro-optical cross talk that occurs in a display that is operated in Spectrum Sequential mode is disclosed. The invention eliminates annoying visible artefacts, such as contouring, noise, or color deviation, which normally are introduced by this cross talk by compensating for the cross talk. According to embodiments of the invention, a drive signal (R′,G′,B′) to drive picture elements of the display is altered in video processing circuitry (MPC, XTC, SC) and/or software, in dependence on one or more properties of different spectra from a light source (23, 24) in the display. The invention is implemented with little extra effort and cost in known LCD displays.
摘要:
A method of converting a three primary color input signal comprises a first, a second, and a third input signal (C1, C2, C3) into a four primary color drive signal comprising a first, second, third, and fourth drive signal (P1, P2, P3, P4) for driving four primary colors of a multi-primary color additive display (3). Three functions (F1, F2, F3) representing the first, second, and third drive signal (P1, P2, P3) as a function of the fourth drive signal (P4) are defined. The intersection values (P4i) of the fourth drive signal (P4) are determined at a set of intersections of: the three functions (F1, F2, F3) mutually, and of the three functions (F1, F2, F3) and a line (F4) defined by the fourth drive signal (P4) being equal to itself, wherein only the intersection values (P4i) of functions having opposite signs of their first derivative are relevant. The associated first, second and third drive signals (P1, P2, P3) are calculated at (i) the intersection values (P4i) of the fourth drive signal (P4) to obtain calculated values (CV1, CV2, CV3), and (ii) at boundary values (P4min, P4max) of a valid range (VR) of the fourth drive signal (P4) wherein all drive signals (P1, P2, P3, P4) have valid values. The values of interest (CV1, CV2, CV3, P4i) comprising the intersection values (P4i) of the fourth drive signal (P4) and the associated calculated values (CV1, CV2, CV3) are determined. The maximum value (Vmax) or minimum value (Vmin) of the values of interest (CV1, CV2, CV3, P4i) at the intersection values (P4i) are calculated. And finally, the intersection value (P4i) at which the maximum value (Vmax) or minimum value (Vmin) is minimum or maximum, respectively, is selected.
摘要:
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
摘要:
A driver (106) for driving pixels (104) of a display (102), wherein the pixels are divided into a first group and a second group and the driver is constructed for supplying a first drive signal to a first pixel and a second drive signal to a second pixel, the first and second pixels being neighboring pixels. The driver (106) comprises means for generating a first upper value and a first lower value; and means for generating a second upper value and a second lower value. It comprises means for driving, in a first operating mode, the first pixel with the first lower value and driving the second pixel with the second upper value. In a second operating mode, driving the first pixel with the first upper value and driving the second pixel with the second lower value. Means (108) for controlling the operating mode alternates between the first operating mode and the second operating mode.
摘要:
A multi-primary conversion method for converting (CON) an input vector (CIP) defining a color of an input pixel in a linear color space (X, Y, Z) into a drive vector (PD) having n components for driving n display primaries (P1, . . . , Pn) of a display color space. The drive vector (PD) comprises m sub-drive vectors (PDi) for driving m groups of the display primaries (P1, . . . , Pn). The conversion method comprises: determining (5, 6; 9, 10) in the linear color space (X, Y, Z) a position of the input vector (CIP) with respect to boundaries (CB) of at least two of three gamuts (FG, ELG, ELCG) being defined by transformed display primaries (CP1, . . . , CPn), wherein the three gamuts (FG, ELG, ELCG) indicate: a full gamut (FG) comprising all colors being reproducible with the m groups of the sub-drive vectors (PDi), an equal luminance sub-gamut (ELG) comprising all colors having equal luminance and being reproducible with each one of the m groups of the sub-drive vectors (PDi), and an equal luminance and equal chrominance sub-gamut (ELCG) comprising all colors being reproducible with each one of the m groups of sub-drive vectors (PDi) each having equal luminance and equal chrominance. Selecting (3; 12, 13) two boundary vectors (CB 1, CB2) on the boundaries (CB) of the three gamuts (FG, ELG, ELCG) to enable the input vector (CIP) to be interpolated from the two boundary vectors (CB1, CB2). Determining (3; 14) an interpolation factor (u) from the position of the input vector (CIP) with respect to the selected two boundary vectors (CB1, CB2). And, interpolating (4; 11) in the display color space the drive vector (PD) representing the color of the input vector (CIP) from the interpolation factor (u) and two boundary vectors (PB1, PB 2) in the display color space corresponding to the selected two boundary vectors (CB1, CB2) in the linear color space.
摘要:
A method of dynamic gamut control comprises the step of controlling (LD) intensities of at least a subset (PR, PG, PB) of a set of color primaries (PR, PG, PB, PW) associated with corresponding sub-pixels (RP, GP, BP, WP) of a display device. The method further comprises the step of searching (PC) for a minimal intensity value (Ra; Ga; Ba) of one of the color primaries of the subset (PR; PG; PB) being adjusted, to obtain together with the other color primaries (WP) of the set of color primaries (PR, PG, PB, PW) an adjusted color gamut (GG1; GR1; GB1; GG2; GR2) still containing all the colors of the set of colors (S) by: for each color of the set of colors (S), determining (PC) the minimal intensity value (Ra; Ga; Ba) of the color primary being adjusted to obtain the adjusted color gamut (GG1; GR1; GB1; GG2; GR2) wherein the selected color of the set of colors (S) lies substantially on a boundary of the adjusted color gamut (GG1; GR1; GB1; GG2; GR2), and selecting (PC) a maximum value of the determined minimal intensity values (Ra; Ga; Ba) of the color primary being adjusted.