ENHANCEMENTS OF A TRANSPARENT DISPLAY TO FORM A SOFTWARE CONFIGURABLE LUMINAIRE

• US 20180005590A1
• Filed: 06/30/2016
• Published: 01/04/2018
• Est. Priority Date: 06/30/2016
• Status: Active Grant

• Current Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Original Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Inventors: Komanduri, Ravi, Raj, Rashmi Kumar, Mao, An, Lin, Guan-Bo, Maher, Hampton Boone, Goodman, Jonathan Lloyd, Ramer, David P.
• Granted Patent: US 10,176,765 B2
• Time in Patent Office: Days
• CPC Class Codes: F21S 8/04 intended only for mounting on a ceiling or the like overhead structures F21S8/02 takes precedence; details of ceiling bases F21V21/03
• CPC Class Codes: F21V 23/003 the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix
• CPC Class Codes: H05B 47/11 by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/1965 using handheld communication devices
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

The examples relate to various implementations of a software configurable lighting device, having an enhance display device that is able to generate light sufficient to provide general illumination of a space in which the lighting device is installed and provide an image display. The general illumination is provided by additional light sources and/or improved display components of the enhanced display device.

Claims

1. A lighting device, comprising:

an image display device configured to display an image;

a general illumination device collocated with the image display device;

a driver system coupled to the image display device and the general illumination device,

the driver system being configured to control light generated by the general illumination device; and

the driver system being configured to control display of the image;

a memory;

a processor having access to the memory and coupled to the driver system to control operation of the driver system; and

programming in the memory, wherein execution of the programming by the processor configures the lighting device to perform functions including functions to;

obtain an image selection and a general lighting generation selection as software control data;

transform the image selection based on a desired color characteristic distribution;

modify the general lighting generation selection based on the transformed image selection;

present an image output, based on the transformed image selection, via the image display device; and

control operation of the general illumination device via the driver system to emit light for general illumination from the general illumination device according to the modified general lighting generation selection.

2. The lighting device of claim 1, wherein:

the general illumination device comprises an array of light emitting diodes (LEDs);

the image display device comprises;

a first set of LED strips oriented in a first direction, each LED strip of the first set including a first number of LEDs evenly spaced along the respective LED strip; and

a second set of LED strips oriented in a second direction perpendicular to the first direction, each LED strip of the second set including a second number of LEDs evenly spaced along the respective LED strip, wherein;

the LED strips of the first set are spaced evenly apart from each other in parallel;

the LED strips of the second set are spaced evenly apart from each other in parallel; and

the first set of LED strips and the second set of LED strips form a grid; and

the general illumination device is located behind the image display device such that illumination generated by any one LED of the array of LEDs passes between a third number of LEDs of the grid of evenly spaced LEDs and is partially blocked by the third number of LEDs of the grid of evenly spaced LEDs, the third number including an equal number of LEDs of the first set of LED strips and LEDs of the second set of LED strips.

3. The lighting device of claim 1, further comprising:

collimating optics; and

a spatial light modulator,

wherein the collimating optics and the spatial light modulator are placed between the general illumination device and the image display device.

4. The lighting device of claim 3, wherein:

the collimating optics comprise total internal reflection lenses optically coupling illumination light generated by the general illumination device to cells of the spatial light modulator; and

each cell of the spatial light modulator couples light to one or more transparent regions of the image display device.

5. The lighting device of claim 3, wherein the spatial light modulator is an electro-wetting cell array.

6. The lighting device of claim 3, further comprising a partial diffuser located on an output side of the image display device.

7. The lighting device of claim 3, wherein:

the driver system is further coupled to the spatial light modulator; and

execution of the programming by the processor further configures the lighting device to perform a further function to control the spatial light modulator to control distribution of illumination generated by the general illumination device, generated illumination distribution being performed by shaping and/or steering of the generated illumination by the spatial light modulator.

8. The lighting device of claim 1, wherein the function to transform the image selection comprises functions to:

calculate a total red content, a total green content and a total blue content of the image selection, wherein;

the total red content equals a summation of red pixel intensity values within the image selection;

the total green content equals a summation of green pixel intensity values within the image selection; and

the total blue content equals a summation of blue pixel values intensity within the image selection;

select an image transformation function based on a number of illumination requirements, the selected image transformation function including unknown variables;

solve, based on the number of illumination requirements, the unknown variables of the selected image transformation function; and

transform the image selection based on the solved image transformation function to generate the transformed image selection.

9. The lighting device of claim 8, wherein:

one requirement is a target coordinated color temperature (CCT) of the image output presented by the image display device; and

presentation of the transformed image selection as the image output presented by the image display device produces a CCT matching the target CCT.

10. The lighting device of claim 8, wherein the function to transform the image selection further comprises a function to apply a second image transformation function, the second image transformation function performing a scaling of individual pixel intensity values.

11. The lighting device of claim 8, wherein the function to transform the image selection further comprises a function to calculate a figure of merit of the transformed image selection, the figure of merit measuring a difference between the image selection and the transformed image selection.

12. The lighting device of claim 1, wherein:

a pixel of the general illumination device corresponds to a number of pixels of the image display device; and

the function to modify the general lighting generation selection comprises functions to;

for each pixel of the general illumination device and based on the transformed image selection;

calculate a total amount of brightness to be produced by the respective corresponding number of pixels of the image display device;

determine a measure of color content to be produced by the respective corresponding number of pixels of the image display device;

select a display function;

select, based on a number of display requirements, a lighting LED function, the lighting LED function including unknown variables corresponding to the number of display requirements;

solve the selected lighting LED function to determine a value for each unknown variable, the solution representing an amount of brightness to be produced by the respective pixel of the general illumination device; and

maximize a ratio of;

a numerator equal to the total amount of brightness to be produced by the respective corresponding number of pixels of the image display device;

to

a denominator equal to the amount of brightness to be produced by the respective pixel of the general illumination device; and

generate, based on the maximized ratios, the modified general lighting generation selection.

13. A method, comprising:

obtaining an image selection and a general lighting generation selection;

transforming the image selection based on a desired color characteristic distribution;

modifying the general lighting generation selection based on the transformed image selection;

presenting, via a transparent image display device, an image output based on the transformed image selection; and

controlling operation of a general illumination device located behind the transparent image display device to emit light for general illumination from the general illumination device according to the modified general lighting generation selection.

14. The method of claim 13, wherein the transforming step comprises:

calculating a total red content, a total green content and a total blue content of the image selection, wherein;

the total red content equals a summation of red pixel intensity values within the image selection;

the total green content equals a summation of green pixel intensity values within the image selection; and

the total blue content equals a summation of blue pixel intensity values within the image selection;

selecting an image transformation function based on a number of display requirements, the selected image transformation function including unknown variables;

solving, based on the number of display requirements, the unknown variables of the selected image transformation function; and

transforming the image selection based on the solved image transformation function to generate the transformed image selection.

15. The method of claim 14, wherein:

one requirement is a target coordinated color temperature (CCT) of the image output presented by the transparent image display device; and

presentation of the transformed image selection as the image output presented by the transparent image display device produces a CCT matching the target CCT.

16. The method of claim 14, wherein the transforming further comprises applying a second image transformation function, the second image transformation function performing a scaling of individual pixel intensity values.

17. The method of claim 14, wherein the transforming further comprises calculating a figure of merit of the transformed image selection, the figure of merit measuring a difference between the image selection and the transformed image selection.

18. The method of claim 13, wherein:

a pixel of the general illumination device corresponds to a number of pixels of the transparent image display device; and

modifying the general lighting generation selection comprises;

for each pixel of the general illumination device and based on the transformed image selection;

calculating a total amount of brightness to be produced by the respective corresponding number of pixels of the transparent image display device;

determining a measure of color content to be produced by the respective corresponding number of pixels of the transparent image display device;

selecting a display function;

selecting, based on a number of illumination requirements, a lighting LED function, the lighting LED function including unknown variables corresponding to the number of illumination requirements;

solving the selected lighting LED function to determine a value for each unknown variable, the solution representing an amount of brightness to be produced by the respective pixel of the general illumination device; and

maximizing a ratio of;

a numerator equal to the total amount of brightness to be produced by the respective corresponding number of pixels of the transparent image display device;

to

a denominator equal to the amount of brightness to be produced by the respective pixel of the general illumination device; and

generating, based on the maximized ratios, the modified general lighting generation selection.

19. The method of claim 13, further comprising:

controlling a spatial light modulator to control distribution of illumination generated by the general illumination device by shaping and/or steering the generated illumination, the collimating optics and the spatial light modulator being located between the general illumination device and the transparent image display device.

20. A non-transitory computer readable medium comprising a memory embodying programming instructions, wherein execution of the programming instructions by a processor configures the processor to perform the method of claim 13.

21. A lighting device, comprising:

a transparent image display device configured to present an image;

a general illumination device collocated with the transparent image display device; and

collimating optics located between the transparent image display device and the general illumination device, wherein;

the general illumination device comprises an array of light emitting diodes (LEDs);

the transparent image display device comprises;

a first set of LED strips oriented in a first direction, each LED strip of the first set including a first number of LEDs evenly spaced along the respective LED strip; and

a second set of LED strips oriented in a second direction perpendicular to the first direction, each LED strip of the second set including a second number of LEDs evenly spaced along the respective LED strip, wherein;

the LED strips of the first set are spaced evenly apart from each other in parallel;

the LED strips of the second set are spaced evenly apart from each other in parallel; and

the first set of LED strips and the second set of LED strips form a grid; and

the general illumination device is located behind the image display device such that illumination generated by any one LED of the array of LEDs passes between a third number of LEDs of the grid of evenly spaced LEDs and is partially blocked by the third number of LEDs of the grid of evenly spaced LEDs, the third number including an equal number of LEDs of the first set of LED strips and LEDs of the second set of LED strips.

22. The lighting device of claim 21, further comprising a partial diffuser located on an output side of the image display device.

23. The lighting device of claim 21, wherein the collimating optics comprise total internal reflection lenses optically coupling illumination light generated by the general illumination device to the transparent image display device such that an amount of the generated illumination light passing between LEDs of the transparent image display device is maximized.

24. The lighting device of claim 21, further comprising a spatial light modulator located between the collimating optics and the transparent image display device, the spatial light modulator configured to control distribution of illumination light generated by the general illumination device by shaping and/or steering the generated illumination light.

25. The lighting device of claim 24, wherein:

the collimating optics comprise total internal reflection lenses optically coupling the generated illumination light to cells the spatial light modulator; and

each cell of the spatial light modulator couples light to one or more transparent regions of the transparent image display device.

26. The lighting device of claim 24, wherein the spatial light modulator is an electro-wetting cell array.

27. The lighting device of claim 24, further comprising a driver system, wherein:

the driver system is coupled to the transparent image display device, the general illumination device and the spatial light modulator; and

the driver system is configured to;

control illumination light generated by the general illumination device;

control distribution of the generated illumination light by the spatial light modulator; and

control display of the image by the transparent image display device.

28. The lighting device of claim 24, further comprising a partial diffuser located on an output side of the transparent image display device.