Loading patent…
AssigneePoro Technologies Ltd
InventorEdward BUCKLEY
Estimating the term…
A method of driving a display device comprising a variable-wavelength LED is provided. The variable-wavelength LED is a pixel of the device, or one of a plurality of subpixels of a device pixel, and the display device is programmed to operate using a palette of N available primary emission wavelengths AR, wherein each of the N available primaries is a wavelength emittable by the variable-wavelength LED. The variable-wavelength LED is driveable to emit light at any of the N available primary emission wavelengths A? in response to N respective subfields of driving conditions. The method comprises the steps of: identifying an output signal to be displayed by a pixel, or a subpixel, of the display device during a display frame; selecting a pair of two of the N available primary emission wavelengths which are combinable to form the output signal; and driving the pixel or subpixel to emit light at the two selected primary emission wavelengths during two subframes within the display frame, so that the light emitted at the two selected primary emission wavelengths during the display frame combines to form the output signal with an output chromaticity and output luminance Lo. A method of calibrating the display device comprises the steps of: selecting a pair of two discrete primary emission wavelengths A?, each primary emission wavelength A? corresponding to a respective subfield of driving conditions; calculating, for the two selected primary emission wavelengths, the respective luminances which sum to a standard illuminant point; and controlling the durations of the respective duty cycles of the two subfields driving the two selected primary emission wavelengths so that the selected primary emission wavelengths A? and luminances of both selected primary emission wavelength subfields are complementary and sum to a standard illuminant point.
A method of driving a display device comprising a variable-wavelength LED, the variable-wavelength LED being a pixel of the device, or one of a plurality of subpixels of a device pixel, the display device being programmed to operate using a palette of N available primary emission wavelengths λP, wherein each of the N available primaries is a wavelength emittable by the variable-wavelength LED, the variable-wavelength LED being driveable to emit light at any of the N available primary emission wavelengths λP in response to N respective subfields of driving conditions,
The method of any preceding claim, wherein the wavelengths of the two selected primary emission wavelengths used in any given display frame are complementary, such that the two primary emission wavelengths in the given display frame are combinable to display a standard illuminant point.
The method of any preceding claim, in which the method is a field-sequential driving method for driving a display device comprising a variable-wavelength LED pixel, comprising the steps of:
The method of any preceding claim, comprising the step of controlling the duration of a duty cycle during which the variable-wavelength LED is illuminated in a respective subframe, to control the luminance of the respective primary emission wavelength emitted during that subframe.
The method of any preceding claim, comprising the step of increasing the duty cycle to increase the luminance of the respective primary emission wavelength emitted during that subframe.
The method of any preceding claim, comprising the step of decreasing the duty cycle to decrease the luminance of the respective primary emission wavelength emitted during that subframe.
The method of any preceding claim, comprising the step of selecting, for each display frame, the two primary emission wavelengths to be emitted during the display frame.
The method of any preceding claim, comprising the step of selecting different pairs of primary emission wavelengths for different display frames, and driving the pixel or subpixel to emit different pairs of primary emission wavelengths in different display frames.
The method of any preceding claim, comprising the step of dividing the display frame into a plurality of subframes, in which the number of subframes is 2 or more.
The method of any preceding claim, in which each primary emission wavelength is displayed in one or more display subframes during a display frame.
The method of any preceding claim, in which in a given display frame the variable-wavelength LED is driven to emit light at two discrete primary emission wavelengths during discrete subframes.
The method of any preceding claim, comprising the step of driving the variable-wavelength LED pixel by applying, during each subframe, one of two subfields of driving conditions to the variable-wavelength LED, the two subfields corresponding to emission of the two selected primary emission wavelengths.
The method of any preceding claim, in which the variable-wavelength LED has an emission wavelength range of between 100 nm and 200 nm, or between 125 nm and 185 nm, or between 150 nm and 175 nm.
The method of any preceding claim, in which the emission wavelength range extends from a lower limit, which is preferably below 500 nm or below 450 nm, to an upper limit, which is preferably above 595 nm or above 630 nm.
The method of any preceding claim, in which the variable-wavelength LED has a FWHM of 50 nm or less, or 40 nm or less, or 30 nm or less, or 20 nm or less.
A method of calibrating a display device comprising a variable-wavelength LED, the variable-wavelength LED being a pixel of the device, or one of a plurality of subpixels of a device pixel, the display device being programmed to operate using a palette of N available primary emission wavelengths λP, wherein each of the N available primaries is a wavelength emittable by the variable-wavelength LED, the pixel or plurality of subpixels being driveable to emit light at any of the N available primary emission wavelengths λP in response to N respective subfields of driving conditions, the method comprising the steps of:
Dependencies are inferred from the claim text.