Light Directed Modulation Displays

• US 20150227003A1
• Filed: 08/05/2013
• Published: 08/13/2015
• Est. Priority Date: 08/10/2012
• Status: Active Grant

• Current Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Original Assignee: Dolby Laboratories Licensing Corporation (Dolby Laboratories Incorporated)
• Inventors: Ninan, Ajit
• Granted Patent: US 9,864,232 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/0121 Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
• CPC Class Codes: G02F 1/133601 for spatial active dimming
• CPC Class Codes: G02F 1/133605 including specially adapted reflectors
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133611 including means for improving the brightness uniformity
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials
• CPC Class Codes: G02F 2203/01 transmissive
• CPC Class Codes: G02F 2203/62 Switchable arrangements whereby the element being usually not switchable
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3426 the different display panel areas being distributed in two dimensions, e.g. matrix

Abstract

A light source includes a light reflector and multi-pixel light modulators. The light reflector is surrounded with reflective surfaces. Light can be injected into the light reflector and diffused throughout the light reflector. The multi-pixel light modulators have individual transmittance states based on image data to modulate light that illuminates multi-pixel portions of a light receiving surface.

Claims

1. A light source, comprising:

a light reflector surrounded with one or more light reflective surfaces, the light reflector being configured to recycle light incident on the one or more light reflective surfaces within the light reflector; and

a plurality of multi-pixel light modulators configured to be set to individual transmittance states based on image data to modulate light (a) exiting from the light reflector and (b) illuminating individual multi-pixel portions of a light receiving surface, the plurality of multi-pixel light modulators being spatially embedded with at least one light reflective surface of the one or more light reflective surfaces,

wherein at least two neighboring multi-pixel portions share a common portion that corresponds to one or more common pixels of a display panel.

2. The light source of claim 1, wherein the multi-pixel portions of the light receiving surface correspond to a set of pixels on a display panel, and wherein each of the multi-pixel portions of the light receiving surface correspond to two or more pixels on the display panel.

3. The light source of claim 1, wherein the light reflector comprises quantum dots in one or more components of the light reflector.

4. The light source of claim 1, wherein at least one multi-pixel light modulator in the plurality of multi-pixel light modulators comprises at least one of:

lenses, shutters, apertures, liquid crystal light valves, mechanical valves, light guides, concave mirrors, or quantum dots.

5. The light source of claim 1, wherein light provided to the light reflector is emitted from at least one of:

side-lit active light emitters or direct-lit active light emitters.

6. The light source of claim 1, wherein light provided to the light reflector is emitted from at least one of:

light-emitting diodes (LEDs), cold cathode fluorescent lights (CCFLs), quantum-dot based light converters, organic light-emitting diodes (OLEDs), fluorescent lights, incandescent lights, or gas discharge lights.

7. The light source of claim 1, wherein at least two multi-pixel light modulators in the plurality of multi-pixel light modulators are configured to illuminate a multi-pixel portion in the individual multi-pixel portions of the light receiving surface with different color light.

8. The light source of claim 1, wherein at least one multi-pixel light modulator in the plurality of multi-pixel light modulators is configured to illuminate a multi-pixel portion in the individual multi-pixel portions of the light receiving surface with one or more selected spectral ranges of light wavelengths.

9. The light source of claim 1, wherein a maximum intensity of light illuminating on a portion of the light receiving surface within an image frame time is proportional to a number of multi-pixel light modulators simultaneously illuminating the portion within the image frame time.

10. The light source of claim 1, wherein the light receiving surface comprises at least one of:

rectangular shapes, polygonal shapes, curved shapes, spherical shapes, concave shapes, convex shapes, irregular shapes, or disjoint shapes.

11. The light source of claim 1, wherein the plurality of multi-pixel light modulators is divided into one or more separately installable modules.

12. The light source of claim 1, wherein light illuminating on a first portion of the light receiving surface within an image frame time is no more than 30 nits, and wherein light illuminating on a second different portion of the light receiving surface within the same image frame time exceeds one of 30 nits, 100 nits, 500 nits, or 1000 nits.

13. The light source of claim 1, wherein a portion of the light receiving surface is configured to be simultaneously within an image frame time illuminated by light directed by one or more multi-pixel light modulators, and wherein light intensity on the portion is configured to be controlled with at least one of:

adjusting light transmittance states of the one or more multi-pixel light modulators, adjusting a spatial density of the one or more multi-pixel light modulators that are in non-dark transmittance states, adjusting time durations of illumination from the one or more multi-pixel light modulators, or adjusting light directions by the one or more multi-pixel light modulators.

14. The light source of claim 1, wherein the at least one light reflective surface in the one or more light reflective surfaces comprises a plurality of light illumination modules, and wherein each illumination module comprises one or more multi-pixel light modulators in the plurality of multi-pixel light modulators.

15. The light source of claim 1, wherein the light source is a part of:

a handheld display device, a tablet computing device, a personal computing device, a television system, a theater-based display system, or an outdoor display system.

16. The light source of claim 1, wherein a light reflective surface in the one or more light reflective surfaces comprises a plurality of concave mirrors.

17. The light source of claim 1, wherein a light reflective surface in the one or more light reflective surfaces comprises at least one of:

reflective metallic surfaces, total internal reflection (TIR) surfaces, substrates, optical films, optical reflective enhancement films, reflective liquid crystal layers, e-papers, or other light reflective materials.

18. The light source of claim 1, wherein each multi-pixel light modulator in a non-dark transmittance state emits an equal amount of light as any of other multi-pixel light modulators in non-dark transmittance states.

19. The light source of claim 1, wherein at least two multi-pixel light modulators in non-dark transmittance states emit two different amounts of light.

20. The light source of claim 1, wherein a display system comprising the light source is configured to vary a total amount of input light injected into the light reflector by one or more active light emitters based on an overall brightness level of an image to be rendered by the display system.

21. The light source of claim 1, wherein the light source is configured with one or more light leaks or light absorbing components to remove, based on an overall brightness level of an image to be rendered, a portion of a total amount of input light injected into the light reflector by one or more active light emitters.

22. The light source of claim 1, wherein the light source is configured with one or more light diffusion elements to disperse input light injected into the light reflector by a specific number of active light emitters throughout the light reflector, wherein the specific number of active light emitters represents a fraction of a total number of pixels in the display system, and wherein the fraction is represented by one of 25%, 20%, 15%, 10%, 5%, 1%, or 0.1%.

23. A method comprising:

receiving image data for one or more images to be rendered in a display system, a light source of the display system having a light reflector comprising one or more light reflective surfaces and a plurality of multi-pixel light modulators; and

setting, based on the image data, the plurality of multi-pixel light modulators to individual transmittance states to modulate light (a) exiting from the light reflector and (b) illuminating individual multi-pixel portions of a light receiving surface;

wherein the light reflector is configured to recycle light incident on the one or more light reflective surfaces within the light reflector,

wherein the plurality of multi-pixel light modulators being spatially embedded with at least one light reflective surfaces of the one or more light reflective surfaces, and

wherein at least two neighboring multi-pixel portions share a common portion that corresponds to one or more common pixels of a display panel.

24. The method of claim 23, wherein the multi-pixel portions of the light receiving surface correspond to a set of pixels on a display panel, and wherein each of the multi-pixel portions of the light receiving surface correspond to two or more pixels on the display panel.

25. The light source of claim 23, wherein the light source is configured with one or more light diffusion elements to disperse input light injected into the light reflector by a specific number of active light emitters throughout the light reflector, wherein the specific number of active light emitters represents a fraction of a total number of pixels in the display system, and wherein the fraction is represented by one of 25%, 20%, 15%, 10%, 5%, 1%, or 0.1%.

26. The method of claim 23, wherein at least two multi-pixel light modulators in the plurality of multi-pixel light modulators are configured to illuminate a multi-Attorney pixel portion in the individual multi-pixel portions of the light receiving surface with different color light.

27. The method of claim 23, wherein light illuminating on a first portion of the light receiving surface within an image frame time is no more than 30 nits, and wherein light illuminating on a second different portion of the light receiving surface within the same image frame time exceeds one of 30 nits, 100 nits, 500 nits, 1000 nits.

28. The method of claim 23, wherein a portion of the light receiving surface is configured to be simultaneously within an image frame time illuminated by light directed by one or more multi-pixel light modulators, and wherein light intensity on the portion is configured to be controlled with at least one of:

adjusting light transmittance states of the one or more multi-pixel light modulators, adjusting a spatial density of the one or more multi-pixel light modulators that are in non-dark transmittance states, adjusting time durations of illumination from the one or more multi-pixel light modulators, or adjusting light directions by the one or more multi-pixel light modulators.

29. The method of claim 23, wherein each multi-pixel light modulator in a non-dark transmittance state emits an equal amount of light as any of other multi-pixel light modulators in non-dark transmittance states.

30. The method of claim 23, wherein at least two multi-pixel light modulators in non-dark transmittance states emit two different amounts of light.

31. The method of claim 23, further comprising varying a total amount of input light injected into the light reflector by one or more active light emitters based on an overall brightness level of an image to be rendered.

32. The method of claim 23, further comprising determining an overall light field on the light receiving surface based on the individual transmittance states of the plurality of multi-pixel light modulators.

33. An apparatus comprising a processor and configured to perform the method recited in claim 23.

34. A computer readable storage medium, storing software instructions, which when executed by one or more processors cause performance of method recited in claim 23.