CN-121986547-A - Sharper patterned illumination with added background

Abstract

An illumination system and a method of enhancing contrast are described. A Light Emitting Diode (LED) array is controlled to provide a substantially constant background illumination over an area other than a target area prior to adjusting the driving of LEDs in the LED array. Constant background illumination is obtained by driving the associated LEDs with a non-zero drive current that is significantly less than the current used to drive the LEDs associated with the target area. Once the contrast enhanced region is determined, the LEDs that provide illumination to the contrast enhanced region are no longer driven, while the driving of the other LEDs remains constant.

Inventors

• M. H.A. Van Steen
• M. A/S

Assignees

• 亮锐有限责任公司

Dates

Publication Date

20260505

Application Date

20240517

Priority Date

20230531

Claims (20)

1. 1. A lighting system, comprising: At least one light source configured to provide illumination over a predetermined area, the at least one light source comprising at least one Light Emitting Diode (LED) array having a plurality of LEDs, and A controller comprising at least one processor and configured to, the at least one processor is configured to: selecting an illumination pattern of the at least one light source, the illumination pattern comprising a target area, Determining at least a portion of an illumination pattern to be used in contrast enhancement, the at least a portion of the illumination pattern being adjacent to the target area, and Parameters for providing at least a portion of the illumination pattern are adjusted to increase a contrast between at least a portion of the illumination pattern and the target area.
2. 2. The lighting system of claim 1, wherein to adjust a parameter, the at least one processor is configured to adjust a current for driving a set of LEDs configured to provide at least a portion of the illumination pattern.
3. 3. The lighting system according to claim 1 or 2, wherein: The driving of the illumination pattern is based on a matrix of elements configured to control the intensity of illumination from each LED, and To adjust the parameters, the at least one processor is configured to apply a filter mask to apply a two-dimensional (2D) convolution to the element matrix.
4. 4. A lighting system according to claim 3, wherein the size of the element matrix and the size of the filter mask matrix are different.
5. 5. The lighting system of any one of claims 1-4, wherein the at least one processor is configured to control driving of LEDs associated with a first background region of the lighting pattern to provide non-zero current to LEDs associated with the first background region prior to adjusting parameters, the first background region including regions of the lighting pattern other than the target region, the non-zero current being substantially less than current used to drive LEDs associated with the target region.
6. 6. The lighting system of claim 5, wherein, after adjusting the parameter, the at least one processor is configured to control driving of LEDs associated with a second background area of the lighting pattern to provide a non-zero current to LEDs associated with the second background area and to provide a zero current to LEDs associated with at least a portion of the lighting pattern.
7. 7. The illumination system of claim 6, wherein the first background region is to be formed by the second background region and at least a portion of the illumination pattern.
8. 8. The illumination system of claim 6, wherein at least a portion of the illumination pattern is disposed between the second background region and the target region.
9. 9. The lighting system of claims 1-8, wherein the at least one light source is disposed within a vehicle.
10. 10. The lighting system of claims 1-9, wherein at least one of: the controller is configured to control a driver in the at least one light source to provide the illumination pattern, or The user interface is configured to wirelessly control the controller to set the illumination pattern.
11. 11. A lighting device, comprising: at least one Light Emitting Diode (LED) array configured to provide illumination over a predetermined area, the at least one LED array having a plurality of LEDs, and A controller comprising at least one processor and configured to, the at least one processor is configured to: Selecting an illumination pattern of the at least one LED array, the illumination pattern comprising a target area, Determining at least a portion of an illumination pattern to be used in contrast enhancement, the at least a portion of the illumination pattern being adjacent to the target area, and Parameters for providing at least a portion of the illumination pattern are adjusted to increase a contrast between at least a portion of the illumination pattern and the target area.
12. 12. The lighting device of claim 11, wherein to adjust a parameter, the at least one processor is configured to adjust a current for driving a set of LEDs configured to provide at least a portion of the illumination pattern.
13. 13. The lighting device according to claim 11 or 12, wherein: The driving of the illumination pattern is based on a matrix of elements for controlling the intensity of illumination from each LED, and To adjust the parameters, the at least one processor is configured to apply a filter mask to apply a two-dimensional (2D) convolution to the element matrix.
14. 14. The lighting device of any one of claims 11-13, wherein the at least one processor is configured to control driving of LEDs associated with a first background region of the lighting pattern to provide non-zero current to LEDs associated with the first background region prior to adjusting the parameter, the first background region including the lighting pattern other than the target region, the non-zero current being substantially less than a current used to drive LEDs associated with the target region.
15. 15. The lighting device of claim 14, wherein, after adjusting the parameter, the at least one processor is configured to control driving of LEDs associated with a second background area of the lighting pattern to provide a non-zero current to LEDs associated with the second background area and to provide a zero current to LEDs associated with at least a portion of the lighting pattern.
16. 16. The illumination apparatus of claim 15, wherein the first background region is to be formed by the second background region and at least a portion of the illumination pattern.
17. 17. The illumination device of claim 15, wherein at least a portion of the illumination pattern is disposed between the second background region and the target region.
18. 18. A method of operating a lighting device, the method comprising: Providing illumination over a predetermined area using at least one Light Emitting Diode (LED) array having a plurality of LEDs; selecting an illumination pattern of the at least one LED array, the illumination pattern comprising a target area; determining at least a portion of an illumination pattern to be used in contrast enhancement, the at least a portion of the illumination pattern being adjacent to the target area, and Parameters for providing at least a portion of the illumination pattern are adjusted to increase a contrast between at least a portion of the illumination pattern and the target area.
19. 19. The method according to claim 18, wherein: driving the illumination pattern is based on a matrix of elements for controlling the intensity of illumination from each LED, and Adjusting parameters includes applying a filter mask to apply a two-dimensional (2D) convolution to the element matrix.
20. 20. The method of claim 18 or 19, wherein: Driving LEDs associated with a first background area of the illumination pattern prior to adjusting parameters to provide non-zero current to LEDs associated with the first background area, the first background area including the illumination pattern other than the target area, the non-zero current being substantially less than current used to drive LEDs associated with the target area, and After adjusting the parameters, driving the LEDs associated with a second background area of the illumination pattern to provide a non-zero current to the LEDs associated with the second background area and to provide a zero current to the LEDs associated with at least a portion of the illumination pattern.

Description

Sharper patterned illumination with added background Priority claim The present application claims the benefit of priority from U.S. provisional patent application Ser. No. 63/469954 filed on 5/31 of 2023, which is incorporated herein by reference in its entirety. Technical Field The present disclosure relates to area illumination. In particular, embodiments are directed to control of a luminaire including an array of Light Emitting Diodes (LEDs) at an illumination overlap region. Background Luminaires and other lighting devices are used for lighting in various places, including both indoor and outdoor areas. A typical example in which a plurality of luminaires is used is a larger room, such as a conference area. The optimal illumination of a room (which may include a mixture of direct and indirect light) may depend on the use case. The optimal distribution, direction and/or spectrum of light from the various light sources may vary depending on the application. Drawings Fig. 1 illustrates a lighting system according to some examples. Fig. 2 illustrates an example of a general lighting device according to some embodiments. Fig. 3 illustrates an example of a method of controlling a lighting system according to some embodiments. Fig. 4A-4D illustrate examples of top views of target area illumination according to some embodiments. Fig. 4E-4F illustrate examples of graphs of cross-sections of top views of the target area illumination of fig. 4A-4D, according to some embodiments. Fig. 5 illustrates an example lighting system according to some embodiments. Fig. 6 illustrates an example lighting device according to some embodiments. FIG. 7 illustrates a top plan view of an example array suitable for implementing embodiments described herein. Fig. 8 shows a cross section of LEDs in an LED array according to some examples. Detailed Description Providing optimized lighting conditions may vary depending on, among other things, the area being illuminated, external environmental conditions, and use within a particular area. The optimal (or near-optimal) lighting conditions may be determined based on the proximity to achieve a specified lighting pattern with predetermined parameters. In some cases, the optimized illumination conditions may be provided by modifying the target area with a contrast enhancement pattern, as described in more detail below. Fig. 1 illustrates a lighting system 100 according to some examples. The lighting system 100 includes a plurality of luminaires 106 (or other lighting devices) disposed within a room 110. The illuminator 106 may comprise one or more LED arrays, the LEDs of which may be controlled individually (e.g., segmented LEDs) or in sets of LEDs. As shown in fig. 1, the luminaire 106 may be disposed on a ceiling of the room 110, and the light may be projected onto a surface in the room 110 by the optics of the luminaire 106 and/or the optics external to the luminaire 106. In other embodiments, the illuminator 106 or LED array may be disposed on other surfaces in the room 110 (e.g., wall lamps on a wall), and may be enclosed in a luminaire or object such as furniture. In some embodiments, the illuminator 106 may be stationary, while in other embodiments, the illuminator 106 may be movable (e.g., track lighting or in a lamp). In either case, the light from the illuminator 106 (and possible locations of the illuminator 106) may be controllable in intensity, and in directionality and/or focus in some embodiments. Each LED may be formed of one or more inorganic materials (e.g., binary compounds such as gallium nitride (GaN) or gallium arsenide (GaAs), ternary compounds such as aluminum gallium arsenide (AlGaAs), quaternary compounds such as indium gallium phosphide (InGaAsP), or other suitable materials), typically group III-V materials (defined by columns of the periodic table) or group II-VI materials. Each LED may emit light in the visible spectrum (about 400 nm to about 800 nm). In some embodiments, one or more other layers, such as a phosphor layer, may be disposed on each of the one or more LED arrays to convert light from the LEDs into white light (or another color of light). In some embodiments, at least some LEDs of one or more luminaires 106 may emit light of different wavelengths. In this case, LEDs emitting light of different wavelengths may be formed in different LED arrays. Each LED may be controlled by one or more processors. An example array may include, for example, 7 x 7 individually controllable segments, although other array sizes and shapes may be used. For example, the LEDs in each array may be micro LEDs or may be mini LEDs. Micro LED arrays may include thousands to millions of micro LEDs that can emit light and can be controlled individually or in groups of pixels (e.g., 5 x 5 groups of pixels). Micro LEDs are small (e.g., side length <0.01 mm), and inorganic semiconductor materials (such as those indicated above) can be used to provide monochromatic or polychromatic l