Back to results
US 6,486,859 B1Granted
Color displays
AssigneeBritish Broadcasting Corporation
InventorsMichael George Croll, John Oliver Drewery
Life of this patent
Estimating the term…
Abstract
A plasma display device (10) is provided with circuitry (50) which modifies at least the R and B color component signals so as to compensate for the displacement of the display elements or sub-pixels for each color component relative to each other in the array. Surprisingly, this increases the ratio of wanted signal to alias spectrum. The modification is effected by an interpolator comprising transversal filters (31R, 31B). The circuitry can be combined with down-converters (52) when a high definition source is used. In this case a transversal filter (31G) is also included for the G color component signal.
Claims21
A color display apparatus, comprising:
- a discrete color display device having a two-dimensional array of separate display elements in repeated groups of sub-elements, one sub-element for each color component, the sub-elements in each display element for the different color components being relatively displaced to each other, and supply circuitry for supplying color component signals to the discrete color display device, in which the supply circuitry comprises:
- input means for receiving a plurality of input sampled color component signals;
- modifying means coupled to the input means and comprising interpolation means for interpolating for each one of at least all but one of the input sampled color component signals to provide a corresponding output color component signal wherein, for each of the input sampled color component signals the interpolation means interpolates, the interpolation means receives a plurality of individual input sampled color component signals for the color component, each input sample color component signal representing the extent to which the color component is to be displayed at a different location on the display, and interpolates the received input sample color;
- component signals to product an output color component signal that is compensated for the displacement of the sub-elements for each color component relative to each other;
- and
- output means for applying the output color component signals produced by said interpolation means and the input sampled color component signals not subject to displacement-compensation interpolation to the discrete color display device.
3 more elements
A method of displaying a color image on a discrete color display device comprising the steps of:
- providing al discrete display device, said display device having a Plurality of separate display elements, each said display element having three sub-elements, each sub-element for a separate color component, the sub-elements for each display element being relatively displaced to each other;
- receiving three input sampled color component signals;
- modifying at least two of the input color component by signals by interpolation wherein, the interpolation step is performed by interpolating a plurality of individual samples of the color component signal for the color component, each sample representing the extent to which the color component is displayed at a different location on the display so as to produce an output color component that is compensated for the displacement of the sub-elements for each color component relative to each other on the discrete display device;
- and
- applying the output color component signals produced as result of the displacement-compensating interpolation step to the display device and applying any received input sampled color component signals not subjected to the displacement-compensating interpolation step to the display device.
2 more elements
A display apparatus, said display apparatus including:
- a color display having a plurality of display elements, each said display element comprising a plurality of sub-elements, each sub-element displaying a different color component, said sub-elements within each said display element being displaced from each other;
- an input port for receiving a plurality of sampled color component signals, each color component signal corresponding to a control signal for said display sub-elements for one of the color components;
- an interpolator for receiving the sampled color components signals, said interpolation circuit comprising:
- at least one interpolation circuit for receiving a plurality of samples of the color component signals for a specific one of said color components;
- said interpolation circuit having a plurality of multipliers and an adder that are configured to interpolate the received sample color component signals to produce an output color component signal for application to said display wherein, said interpolator has a sufficient number of said interpolation circuits so that all but one of ;said color component signals are subjected to interpolation;
- and said multipliers and said adder forming each said interpolation circuit are configured to produce an output color component signal that is compensated for the displacement of said display sub-elements associated with the color component to which the output color component signal is applied;
- and
- a pass through circuit for receiving samples of the one color component signal not applied to said interpolation circuits and applying the received samples of the one color component as an output color component signal to said display.
5 more elements
Dependencies are inferred from the claim text.