Lighting device on grid sheet carrier
A lighting device comprising a grid sheet carrier 3 mounted via its border 4 on a base part and having an open surface area 5 of a plurality of openings 7 and having carrier material 9 surrounding said openings. The carrier material 9 being arranged in a two-dimensional, first pattern 11 . The lighting device further comprises a plurality of LEDs 13 mounted on one main face 15 of the carrier material 9 and arranged in a two-dimensional, second pattern 17 . The second pattern 17 is coinciding with the first pattern 11 when superimposed and the second pattern 17 is at least a sub-pattern of the first pattern 11 . Furthermore, R is a ratio between the plurality of LEDs 13 and the plurality of openings 7 , wherein R>=3.
1. A lighting device comprising:
a grid sheet carrier bordered by a border and comprising an open surface area of a plurality of openings and comprising carrier material surrounding said openings, said carrier material being arranged in a two-dimensional, first pattern, and wherein the grid sheet carrier is mounted via its border on a base part,
a plurality of LEDs having an emission profile with a relatively large apex angle of at least 60 degrees and being mounted only on one main face of the carrier material and arranged in a two-dimensional, second pattern,
wherein the second pattern is coinciding with the first pattern when superimposed,
wherein the second pattern is at least a sub-pattern of the first pattern, and
wherein R is a ratio between the plurality of LEDs and the plurality of openings, with R being at least three,
wherein each opening has a perimeter of bridges and nodes formed by the carrier material, wherein the bridges are mutually connected at nodes, and wherein the LEDs are mounted on at least the bridges,
wherein the LEDs are individually addressable or addressable in groups via a data cable provided at the bridges and nodes and the data cable is connected to a controller, and
further comprising an at least partly diffuse reflector provided at an average distance Drg in a first direction from the grid sheet carrier, Drg being in the range of 0.5 to 2 times an average shortest distance d between two opposite LEDs around an opening, or Drg is essentially equal to said average shortest distance d.
2. The Lighting device as claimed in claim 1 , wherein each opening is associated with at least four LEDs, or with at least eight LEDs.
3. The Lighting device as claimed in claim 1 , wherein the plurality of LEDs are evenly distributed around the perimeter of a respective opening.
4. The Lighting device as claimed in claim 3 , wherein the LEDs are mounted at the bridges and nodes.
5. The Lighting device as claimed in claim 4 , wherein the LEDs are connected in parallel to a power supply and are connected in series to the data cable.
6. The Lighting device as claimed in claim 1 , wherein the open surface area and the surface formed by the carrier material have a surface ratio Sr, with 1<=Sr<=10.
7. The Lighting device as claimed in claim 1 , wherein over essentially the whole first pattern bridges of the surface formed by the carrier materials have an equal and constant width.
8. The Lighting device as claimed in claim 1 , wherein a ratio CSr between a largest cross section LCS and a smallest cross section SCS of each opening is the range of 1<CSr<=6.
9. The Lighting device as claimed in claim 1 , wherein the first pattern is a regular grid.
10. The Lighting device as claimed in claim 1 , wherein the first pattern is an irregular grid.
11. The Lighting device as claimed in claim 1 , wherein the grid sheet carrier is provided with at least one sensor mounted on the same face as the LEDs.
12. The Lighting device as claimed in claim 1 , wherein the LEDs comprise RGB LEDs, RGBW LEDs, or RGBWA LEDs.
13. The Lighting device as claimed in claim 1 , wherein the first pattern is made in one integral part.
14. The Lighting device as claimed in claim 1 , wherein the grid sheet carrier is self-supporting.