초록 ▼

A light source for backlighting a display panel comprises a light-emitting device such as an incandescent light bulb or LED array disposed within a cavity having diffusely reflecting walls and an aperture. A diffuser and brightness enhancing film are situated at the opening of the aperture between t

A light source for backlighting a display panel comprises a light-emitting device such as an incandescent light bulb or LED array disposed within a cavity having diffusely reflecting walls and an aperture. A diffuser and brightness enhancing film are situated at the opening of the aperture between the aperture and the display to be backlit. Preferably, light emerging from the aperture is substantially uniform in intensity and color, and in one embodiment, a color filter is employed to whiten the light emerging from the aperture. One embodiment has an aperture in which the ratio of the area of the aperture to the sum of such area and the surface area of the cavity is at least 0.05. In this embodiment, the ratio of the depth of the cavity to an edge to edge dimension of the cavity is at least 0.1.

대표청구항 ▼

An apparatus comprising: a display panel having a rear surface and a front surface, said display panel being at least partially transmissive such that at least a portion of illumination on said rear surface is transmitted to said front surface; a light source for backlighting said display panel, sai

An apparatus comprising: a display panel having a rear surface and a front surface, said display panel being at least partially transmissive such that at least a portion of illumination on said rear surface is transmitted to said front surface; a light source for backlighting said display panel, said light source comprising: a device that emits light; a housing having diffusive reflective interior surfaces forming a cavity, said cavity having a depth, said light emitting device mounted in said cavity, said housing having an aperture which opens into said cavity, said aperture juxtaposed with said rear surface of said display panel to illuminate said rear surface, said cavity having a diffusive reflective surface area and said aperture having an area, the ratio of said area of said aperture to the sum of (i) said area of said aperture and (ii) said surface area of said cavity being at least 0.05, said aperture having an edge to edge dimension, the ratio of said depth to said edge-to-edge dimension being at least 0.1; a diffuser at said aperture, said diffuser positioned to diffuse illumination which passes through said aperture from said cavity toward said display panel; a brightness enhancing material disposed between said diffuser and said display panel, said material concentrating illumination within a viewing angle so as to enhance the brightness of the display panel.