초록 ▼

A display device (10) includes a display panel, such as a liquid crystal panel (12), in combination with a reflective holographic optical element (14) that redirects ambient light for illuminating the display. The light redirected by the holographic element is limited to a predetermined spectral ban

A display device (10) includes a display panel, such as a liquid crystal panel (12), in combination with a reflective holographic optical element (14) that redirects ambient light for illuminating the display. The light redirected by the holographic element is limited to a predetermined spectral band. Fluorescent film (16) is included for absorbing light outside the spectral band of the holographic element and re-emitting light within the spectral band to increase the light redirected by the holographic element and thus increase the apparent brightness of the display.

대표청구항 ▼

A display device illuminatable by diffuse ambient light and comprising a display panel having a front side for viewing a display and a back side opposite the front side, said display panel comprising a transparent region, a reflective holographic optical element effective for redirecting light havin

A display device illuminatable by diffuse ambient light and comprising a display panel having a front side for viewing a display and a back side opposite the front side, said display panel comprising a transparent region, a reflective holographic optical element effective for redirecting light having a wavelength within a predetermined spectral band in a reflection pattern and optically coupled to the display panel for receiving light transmitted through the panel and for directing light in the reflection pattern toward the back side of the display panel, whereupon light redirected toward a transparent region of the display panel is transmitted through the display panel to form a bright area for the display, and a fluorescence element containing a fluorescent compound that absorbs light having a wavelength outside the predetermined spectral band and emits fluorescent light having a wavelength within the predetermined spectral band and optically coupled to the display panel and the reflective holographic optical element to receive light transmitted through the display panel and to emit fluorescent light toward the reflective holographic optical element, whereupon fluorescent light received by the reflective holographic optical element is redirected within the reflection pattern to enhance brightness of the bright area for the display.