Illumination system and display device
AssigneeKoninklijke Philips Electronics N.V.
InventorsChristoph Gerard August Hoelen, Gerard Harbers
Life of this patent
Estimating the term…
Abstract
A backlight system includes at least first and second light-emitting panels (1; 11) having a front wall (2; 12), an opposing rear wall (3; 13) and opposite edge surfaces (4, 14; 5, 15). At least one of the edge surfaces (4; 14) is light-transmitting and associated with a light source (6; 16). Light originating from the light source is diffused in the light-emitting panels and coupled out of the light-emitting panels in the direction of a display device (25), preferably a LCD device. The light source associated with the first light-emitting panel (1) has clusters of red and blue or red and green LEDs. The light source (16) associated with the second light-emitting panel (11) has clusters of blue and green LEDs or only green LEDs.
Claims22
An illumination system for illuminating a display device, the illumination system comprising:
- first and second light-emitting panels arranged so as to be at least substantially parallel, each panel having a front wall, a rear wall situated opposite said front wall, and edge areas between the front wall and the rear wall,
- at least one of the edge areas of the first and second panels being light-transmitting,
- at least one light source in each panel being associated with its respective light-transmitting edge area, and
- in operation, light originating from the light source being incident on the light-transmitting edge area and spreading in the panel,
- characterized in that
- the light source associated with the light-transmitting edge area of the first light-emitting panel comprises first and second light-emitting diodes having respective first and second light emission wavelengths,
- the light source associated with the light-transmitting edge area of the second light-emitting panel comprises a third light-emitting diode having a third light emission wavelength, and
- the first, the second and the third light emission wavelength being different.
An illumination system for illuminating a display device, the illumination system comprising:
- a first light-emitting panel, a second light-emitting panel and a third light-emitting panel, said first, second and third light-emitting panels arranged so as to be substantially parallel, each panel having a front wall, a rear wall situated opposite said front wall, and edge areas between the front wall and the rear wall,
- at least one of the edge areas of the first, second and third panels being light-transmitting,
- at least one light source in each panel being associated with its respective light-transmitting edge area, and
- in operation, light originating from the light source being incident on the light-transmitting edge area and spreading in the panel
- the light source associated with the light-transmitting edge area of the first light-emitting panel comprising a light-emitting diode having a first light emission wavelength,
- the light source associated with the light-transmitting edge area of the second light-emitting panel comprising a light-emitting diode having a second light emission wavelength,
- the light source associated with the light-transmitting edge area of the third light-emitting panel comprising a light-emitting diode having a third light emission wavelength, and
- the first, the second and the third light emission wavelength are different.
An illumination system for illuminating a display device, the illumination system comprising:
- first and second light-emitting panels arranged so as to be at least substantially parallel, each panel having a front wall, a rear wall situated opposite said front wall, and edge areas between the front wall and the rear wall,
- at least one of the edge areas of the first and second panels being light-transmitting,
- at least one light source in each panel being associated with its respective light-transmitting edge area, and
- in operation, light originating from the light source being incident on the light-transmitting edge area and spreading in the panel,
- the light source associated with the light-transmitting edge area of the first light-emitting panel comprising first and second light-emitting diodes having respective first and second light emission wavelengths,
- the light source associated with the light-transmitting edge area of the second light-emitting panel comprising a third light-emitting diode having a third light emission wavelength, and
- the first, the second and the third light emission wavelength being different,
- wherein the light-emitting diodes comprise red (R), green (G) and blue (B) light-emitting diodes provided in a ratio of R:G:B of 2:1:1.
The illumination system as claimed in claim wherein the first light-emitting panel includes a plurality of alternately disposed red and green light-emitting diodes and the second light-emitting panel includes the plurality of only blue light-emitting diodes.
An illumination system for illuminating a display device, the illumination system comprising:
- first and second light-emitting panels arranged so as to be at least substantially parallel, each panel having a front wall, a rear wall situated opposite said front wall, and edge areas between the front wall and the rear wall,
- at least one of the edge areas of the first and second panels being light-transmitting,
- at least one light source in each panel being associated with its respective light-transmitting edge area, and
- in operation, light originating from the light source being incident on the light-transmitting edge area and spreading in the panel,
- the light source associated with the light-transmitting edge area of the first light-emitting panel comprising first and second light-emitting diodes having respective first and second light emission wavelengths,
- the light source associated with the light-transmitting edge area of the second light-emitting panel comprising a third light-emitting diode having a third light emission wavelength, and
- the first, the second and the third light emission wavelength being different,
- wherein the light source associated with the second light-emitting panel further comprises a fourth light emitting diode.
Dependencies are inferred from the claim text.