Illumination system and display device
First Claim
Patent Images
1. An illumination system for illuminating a display device, which illumination system is provided with a light-emitting panel (1) comprisinga front wall (2), a rear wall (3) situated opposite said front wall, and edge areas (4, 5) between the front wall (2) and the rear wall (3), at least one of the edge areas (4) of the panel (1) being light-transmitting, at least one light source (6) being associated with the light-transmitting edge area (4), and in operation, light originating from the light source (6) being incident on the light-transmitting edge area (4) and spreading in the panel (1), characterized in that the light source (6) associated with the light-transmitting edge area (4) of the light-emitting panel (1) comprises clusters (C) of at least three light-emitting diodes (6G, 6B, 6R, 6B′
- , 6G′
;
16G, 16B, 16R, 16R′
, 16B′
, 16G′
;
26G′
;
26B, 26R, 26G, 26R′
, 26B′
, 26G″
) having a first, a second and a third light emission wavelength, which light emission wavelengths are different, an imaginary mirror surface (S), which relates to the cluster (C), being situated in the center of each cluster, the light-emitting diodes in the cluster (C) being arranged in a direction perpendicular to the imaginary mirror surface (S), and the light-emitting diodes (6G, 6B, 6R, 6B′
, 6G′
;
16G;
16B;
16R, 16R′
, 16B′
, 16G′
;
26G′
, 26B, 26R, 26G, 26R′
, 26B′
, 26G″
) being distributed over the cluster (C) in such a manner that the spectral emissions of the light emitted by the light-emitting diodes are mirror symmetrical with respect to the imaginary mirror surface (S).
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Abstract
A backlight system for illuminating a display device comprises a light-emitting panel (1) having a front wall, an opposing rear wall and edge areas (4). At least one of the edge areas (4) is light-transmitting and associated with a light source. The light source associated with the light-transmitting edge areas (4) of the light-emitting panel (1) comprises symmetric clusters (C) of light-emitting diodes having three mutually different light emission wavelengths, for example symmetric clusters (C) of blue, green and red LEDs (6G, 6B, 6R, 6B′, 6G′; 6G, 6B, 6R, 6B′, 6G′; . . . ).
42 Citations
23 Claims
-
1. An illumination system for illuminating a display device, which illumination system is provided with a light-emitting panel (1) comprising
a front wall (2), a rear wall (3) situated opposite said front wall, and edge areas (4, 5) between the front wall (2) and the rear wall (3), at least one of the edge areas (4) of the panel (1) being light-transmitting, at least one light source (6) being associated with the light-transmitting edge area (4), and in operation, light originating from the light source (6) being incident on the light-transmitting edge area (4) and spreading in the panel (1), characterized in that the light source (6) associated with the light-transmitting edge area (4) of the light-emitting panel (1) comprises clusters (C) of at least three light-emitting diodes (6G, 6B, 6R, 6B′ - , 6G′
;
16G, 16B, 16R, 16R′
, 16B′
, 16G′
;
26G′
;
26B, 26R, 26G, 26R′
, 26B′
, 26G″
) having a first, a second and a third light emission wavelength, which light emission wavelengths are different,an imaginary mirror surface (S), which relates to the cluster (C), being situated in the center of each cluster, the light-emitting diodes in the cluster (C) being arranged in a direction perpendicular to the imaginary mirror surface (S), and the light-emitting diodes (6G, 6B, 6R, 6B′
, 6G′
;
16G;
16B;
16R, 16R′
, 16B′
, 16G′
;
26G′
, 26B, 26R, 26G, 26R′
, 26B′
, 26G″
) being distributed over the cluster (C) in such a manner that the spectral emissions of the light emitted by the light-emitting diodes are mirror symmetrical with respect to the imaginary mirror surface (S).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
one light-emitting diode (6R) having the first light emission wavelength being situated in the center of the cluster (C), said light-emitting diode being arranged between two light-emitting diodes (6B, 6B′
) having the second light emission wavelength, andeach of said two light-emitting diodes being flanked, on the side facing away from the center of the cluster (C), by a light-emitting diode (6G, 6G′
) having the third light emission wavelength.
- , 6G′
-
3. An illumination system as claimed in claim 1, characterized in that each one of the clusters (C′
- ) comprises six light-emitting diodes (16G, 16B, 16R, 16R′
, 16B′
, 16G′
),two light-emitting diodes (16R, 16R′
) having the first light emission wavelength being situated in the center of the cluster (C′
),said two light-emitting diodes being arranged between two light-emitting diodes (16B, 16B′
) having the second light emission wavelength, andthe latter two light-emitting diodes each being flanked, on the side facing away from the center of the cluster (C′
), by a light-emitting diode (16G, 16G′
) having the third light emission wavelength.
- ) comprises six light-emitting diodes (16G, 16B, 16R, 16R′
-
4. An illumination system as claimed in claim 1, characterized in that each one of the clusters (C″
- ) comprises seven light-emitting diodes (26G′
, 26B, 26R, 26G, 26R′
, 26B′
, 26G″
),one light-emitting diode (26G) having the first light emission wavelength being situated in the center of the cluster (C″
),said light-emitting diode being arranged between two light-emitting diodes (26R, 26R′
) having the second light emission wavelength,said two light-emitting diodes being flanked, on the side facing away from the center of the cluster (C″
), by a light-emitting diode (26B, 26B′
) having the third light emission wavelength, andthe latter light-emitting diodes each being flanked, on the side facing away from the center of the cluster (C″
), by a light-emitting diode (26G′
, 26G″
) having the first light emission wavelength.
- ) comprises seven light-emitting diodes (26G′
-
5. An illumination system as claimed in claim 1, characterized in that the light source (6) associated with the light-transmitting edge area (4) of the light-emitting panel (1) comprises symmetric clusters (C, C′
- , C″
) of blue, green and red light-emitting diodes (6G, 6B, 6R, 6B′
, 6G′
;
16G;
16B, 16R, 16R′
, 16B′
, 16G′
;
26G′
, 26B, 26R, 26G, 26R′
, 26B′
, 26G″
).
- , C″
-
6. An illumination system as claimed in claim 1, characterized in that two neighboring clusters of light-emitting diodes share a light-emitting diode at the location of an imaginary interface between the clusters.
-
7. An illumination system as claimed in claim 1, characterized in that each one of the light-emitting diodes (6G;
-
6B, 6R, 6B′
, 6G′
;
16G;
16B, 16R, 16R′
, 16B′
, 16G;
26G′
, 26B, 26R, 26G, 26R′
, 26B′
, 26G″
;
106G;
116B, 116R, 116B′
;
126B, 126R, 126R′
, 126B′
;
136B′
, 136R, 136B, 136R′
, 136B″
;
146B″
, 146B, 146R, 146B′
, 146B′
″
;
206GB, 206R, 206GB′
;
216R, 216GB, 216GB′
, 216R′
;
226GB′
, 226R, 226GB, 226R′
, 226GB″
) has a luminous flux of at least 5 lm.
-
6B, 6R, 6B′
-
8. An illumination system as claimed in claim 1 wherein each cluster of light emitting diodes is formed as a multi-chip package containing light emitting diodes of the first, second and third emission wavelength.
-
9. A display device provided with an illumination system as claimed in claim 1.
-
10. A display device as claimed in claim 9, said display device comprising a liquid crystal display (25).
-
11. A display device as claimed in claim 9, wherein each cluster of light emitting diodes is formed as a multi-chip package containing light emitting diodes of the first, second and third emission wave length.
-
12. An illumination system for illuminating a display device, which illumination system is provided with a light-emitting panel (101;
-
111) comprising
a front wall (102;
112) a rear wall (103;
113) opposite said front wall, and edge areas (104, 105;
114, 115) between said front wall (102;
112) and said rear wall (103;
113),at least one of the edge areas (104;
114) of the panel (101;
111) being light-transmitting,at least one light source (106;
116) being associated with the light-transmitting edge area (104;
114), andin operation, light originating from the light source (106;
116) being incident on the light-transmitting edge area (104;
114) and diffusing in the panel (101;
111), characterized in that,the illumination system comprises a first light-emitting panel (101) and a second light-emitting panel (111), which first and second light-emitting panel (101, 111) are arranged substantially parallel to each other, the light source (106) associated with the light-transmitting edge area (104) of the first light-emitting panel (101) comprises a plurality of light-emitting diodes (106G, 106G′
, 106G″
, . . . ) having a first light emission wavelength, andthe light source (116) associated with the light-transmitting edge area (114) of the second light-emitting panel (111) comprises clusters (C2) of at least two light-emitting diodes (116B, 116R, 116B′
, 126B, 126R, 126R′
, 126B′
;
136B′
, 136R, 136B, 136R, 136B″
;
146B″
, 146B, 146R, 146B′
, 146B′
″
) having a second and a third light emission wavelength,an imaginary mirror surface (S2) that relates to the cluster being arranged in the middle of each cluster (C2), the light-emitting diodes in the cluster (C2) being arranged in a direction perpendicular to the imaginary mirror surface (S2), the light-emitting diodes (116B, 116R, 116B′
;
126B, 126R, 126R′
, 126B′
;
136B′
, 136R, 136B, 136R, 136B″
;
146B″
, 146B, 146R, 146B′
, 146B′
″
) being distributed over the cluster (C2) in such a manner that the spectral emissions of the light emitted by the light-emitting diodes are mirror symmetrical with respect to the imaginary mirror surface (S2), andthe first, second and third light emission wavelengths being different. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
one light-emitting diode (116R) having the second light emission wavelength being situated in the middle of the cluster (C2), said light-emitting diode being arranged between two light-emitting diodes (116B, 116B′
) having the third light emission wavelength.
-
111) comprising
-
14. An illumination system as claimed in claim 12, characterized in that each one of the clusters (C2′
- ) comprises four light-emitting diodes (126B, 126R, 126R′
, 126B′
),two light-emitting diodes (126R, 126R′
) having the second light emission wavelength being situated in the middle of the cluster (C2′
),said two light-emitting diodes being arranged between two light-emitting diodes (126B, 126B′
) having the third light emission wavelength.
- ) comprises four light-emitting diodes (126B, 126R, 126R′
-
15. An illumination system as claimed in claim 12, characterized in that each one of the clusters (C2″
- ) comprises five light-emitting diodes (136B′
, 136R, 136B, 136R′
, 136B″
),one light-emitting diode (136B) having the third light emission wavelength being situated in the middle of the cluster (C2″
),said light-emitting diode being arranged between two light-emitting diodes (136R, 136R′
) having the second light emission wavelength, andeach one of said two light-emitting diodes being flanked, on the side facing away from the middle of the cluster (C2″
), by a light-emitting diode (136B′
, 136B″
) having the third light emission wavelength.
- ) comprises five light-emitting diodes (136B′
-
16. An illumination system as claimed in claim 12, characterized in that each one of the clusters (C2′
- ″
) comprises five light-emitting diodes (146B″
, 146B, 146R, 146B′
, 146B′
″
),one light-emitting diode (146R) having the second light emission wavelength being situated in the middle of the cluster (C2′
″
),said light-emitting diode being arranged between two light-emitting diodes (146B, 146B′
) having the third light emission wavelength, andeach one of said two light-emitting diodes being flanked, on the side facing away from the middle of the cluster (C2′
″
), by a light-emitting diode (146B″
, 146B′
″
) having the third light emission wavelength.
- ″
-
17. An illumination system as claimed in claim 12, characterized in that
the light source (106) associated with the light-transmitting edge area (104) of the first light-emitting panel (101) comprises a plurality of green light-emitting diodes (106G), and the light source (116) associated with the light-transmitting edge area (114) of the second light-emitting panel (111) comprises symmetric clusters (C2, C2′ - , C2″
, C2′
″
) of blue and red light-emitting diodes (116B, 116R, 116B′
;
126B, 126R, 126R′
, 126B′
;
136B′
, 136R, 136B, 136R′
, 136B″
;
146B″
, 146B, 146R, 146B′
, 146B′
″
).
- , C2″
-
18. An illumination system as claimed in claim 12, characterized in that the light source (106) associated with the light-transmitting edge area (104) of the first light-emitting panel (101) comprises a plurality of red light-emitting diodes, and
the light source (116) associated with the light-transmitting edge area (114) of the second light-emitting panel (111) comprises symmetric clusters of blue and green light-emitting diodes. -
19. An illumination system as claimed in claim 12, characterized in that
the light source (106) associated with the light-transmitting edge area (104) of the first light-emitting panel (101) comprises a plurality of blue light-emitting diodes, and the light source (116) associated with the light-transmitting edge area (114) of the second light-emitting panel (111) comprises symmetric clusters of red and green light-emitting diodes.
-
20. An illumination system for illuminating a display device, which illumination system is provided with a light-emitting panel (1) comprising
a front wall (2), a rear wall (3) opposite said front wall, and edge areas (4, 5) between said front wall (2) and said rear wall (3), at least one of the edge areas (4) of the panel (1) being light-transmitting, at least one light source (6) being associated with the light-transmitting edge area (4), and in operation, light originating from the light source (6) being incident on the light-transmitting edge area (4) and diffusing in the panel (1), characterized in that, the light source (6) associated with the light-transmitting edge area (4) of the light-emitting panel (1) comprises clusters (C3) of at least one light-emitting diode (206R; -
216R, 216R′
;
226R, 226R′
″
) having a first light emission wavelength and at least one light-emitting diode (206GB, 206GB′
;
216GB, 216GB′
;
226GB′
, 226GB, 226GB″
) having a combination of a second and a third light emission wavelength, which light emission wavelengths are different,an imaginary mirror surface (S3) that relates to the cluster (C3) being situated in the middle of each cluster, the light-emitting diodes in the cluster (C3) being arranged in a direction perpendicular to the imaginary mirror surface (S3), and the light-emitting diodes (206GB, 206R, 206GB′
;
216R, 216GB, 216GB′
, 216R′
;
226GB′
, 226R, 226GB, 226R′
, 226GB″
) being distributed over the cluster (C3) in such a manner that the spectral emissions of the light emitted by the light-emitting diodes are mirror symmetrical with respect to the imaginary mirror surface (S3).- View Dependent Claims (21, 22, 23)
one light-emitting diode (206R) having the first light emission wavelength being situated in the middle of the cluster (C3), said light-emitting diode being arranged between two light-emitting diodes (206B, 206B′
) having the combination of the second and the third light emission wavelength.
-
216R, 216R′
-
22. An illumination system as claimed in claim 20, characterized in that each one of the clusters (C3′
- ) comprises four light-emitting diodes (216R, 216GB, 216GB′
, 216R′
),two light-emitting diodes (216GB, 216GB′
) having the combination of the first and the second light emission wavelength being situated in the middle of the cluster (C3′
),said two light-emitting diodes being arranged between two light-emitting diodes (216R, 216R′
) having the third light emission wavelength.
- ) comprises four light-emitting diodes (216R, 216GB, 216GB′
-
23. An illumination system as claimed in claim 20, characterized in that each one of the clusters (C3″
- ) comprises five light-emitting diodes (226GB′
226R, 226GB, 226R′
, 226GB″
),one light-emitting diode (226GB) having the combination of the first and the second light emission wavelength being situated in the middle of the cluster (C3″
),said light-emitting diode being arranged between two light-emitting diodes (226R, 226R′
) having the third light emission wavelength, andsaid two light-emitting diodes each being flanked, on the side facing away from the middle of the cluster (C3″
), by a light-emitting diode (226GB′
, 226GB′
″
) having the combination of the first and the second light emission wavelength.
- ) comprises five light-emitting diodes (226GB′
Specification
-
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Current AssigneePhilips Lumileds Lighting Company LLC (Apollo Global Management, Inc.)
-
Original AssigneeKoninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
-
InventorsHoelen, Christoph Gerard August, Harbers, Gerard
-
Primary Examiner(s)Nelms, David
-
Assistant Examiner(s)TRAN, LONG K
-
Application NumberUS10/139,180Publication NumberTime in Patent Office379 DaysField of Search257/79-89, 250/227.11, 250/227.21, 250/216, 250/235, 250/239, 362/11, 362/16, 345/38, 345/39, 345/44, 345/46, 345/48, 345/84US Class Current257/89CPC Class CodesG02B 6/0068 Arrangements of plural sour...G02B 6/0073 Light emitting diode [LED]G02F 1/133621 providing coloured light G0...
