Apparatus for Providing Light Source Modulation in Dual Modulator Displays

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

• receiving image data;
• determining first drive signals for the light source 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 layer to emit a first spatially varying light pattern;
• converting light in an optical path between the light source layer and the display modulation layer, the light conversion being performed via 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;
• determining second drive signals for the modulation elements of the display modulation layer based at least in part on the image data and estimated expected characteristics of the second spatially varying light pattern made using a transfer function model relating the first spatially varying light pattern received at the conversion layer to the second spatially varying light pattern received at the display modulation layer;
• and
• displaying the image by applying the first drive signals to the light source layer and the second drive signals to the display modulation layer.