Locally dimmed quantum dot display

A method for displaying an image on a dual modulator display comprising a light source modulation layer incorporating a first array of modulation elements and a display modulation layer incorporating a second array of modulation elements, the method comprising:

• receiving image data;
• determining first drive signals for the modulation elements of the light source modulation layer based at least in part on the image data, the first drive signals, when applied to the modulation elements of the light source modulation layer, causing the light source modulation layer to emit a first spatially varying light pattern;
• providing a phosphorescent plate interposed in an optical path between the light source modulation layer and the display modulation layer to receive the first spatially varying light pattern, the phosphorescent plate comprising one or more materials which emit a second spatially varying light pattern in response to receiving the first spatially varying light pattern, the second spatially varying light pattern having a spectral distribution different from that of the first spatially varying light pattern wherein the phosphorescent plate comprises a patterned plurality of regions, each region comprising a plurality of sub-regions each configured to emit light having a unique spectral distribution relative to the other sub-regions within the same region in response to receiving light from the modulated light source and wherein the plurality of sub-regions within each region comprise a first sub-region which emits light having a first central wavelength, a second sub-region which emits light having a second central wavelength and a third sub-region which emits light having a third central wavelength and further wherein the sub-regions are configured to illuminate an area of the display modulator layer and further wherein the display modulator layer comprises a set of color filtered subpixels to provide a wide color gamut, the second spatially varying light pattern based upon determining the expected light output of the phosphorescent plate when illuminated by the modulated light from the set of emitters to produce the first varying light pattern;
• determining second drive signals for the modulation elements of the display modulation layer based at least in part on the image data and expected characteristics of the second spatially varying light pattern when received at the display modulation layer;
• and
• displaying the image by applying the first drive signals to the light source modulation layer and the second drive signals to the display modulation layer.