Method and apparatus in various embodiments for hdr implementation in display devices

Abstract

An HDR display is a combination of technologies including, for example, a dual modulation architecture incorporating algorithms for artifact reduction, selection of individual components, and a design process for the display and/or pipeline for preserving the visual dynamic range from capture to display of an image or images. In one embodiment, the dual modulation architecture includes a backlight with an array of RGB LEDs and a combination of a heat sink and thermally conductive vias for maintaining a desired operating temperature.

1 . A backlight for a display, comprising:
 a plurality of LEDs arranged on a first side of thermally conductive substrate;   a heat sink disposed on an opposite side of the substrate;   a series of heat conductive vias thermally connecting each LED to the heat sink;   wherein:   the heat conductive vias comprise copper plated holes in the substrate;   the thermally conductive substrate comprising thick power and ground planes dispersed throughout the substrate; and   thermal conductivity of the vias are approximately 400 W/m·K.   
   
   
       2 . The backlight according to  claim 1 , wherein the backlight is configured to project an approximation of an image onto a modulator. 
   
   
       3 . The backlight according to  claim 1 , wherein the backlight is part of a high dynamic range display. 
   
   
       4 . The backlight according to  claim 1 , wherein the backlight is configured to produce an approximation of a desired image and project the image onto a second modulator wherein light emitted by the LEDs is mixed such that the approximation of the desired image is created by a smoothly varying lightfield between the LEDs. 
   
   
       5 . The backlight according to  claim 1 , wherein the backlight LEDs are configured as a first modulator in a dual modulation display that uses a distance between the LEDs and a second modulator to produce a smoothly varying backlight projected onto the second modulator. 
   
   
       6 . The backlight according to  claim 1 , wherein the backlight is installed in a dual modulation display without cooling fans. 
   
   
       7 . The backlight according to  claim 1 , further comprising a non-color changing reflective material configured to direct light away from the heat sink. 
   
   
       8 . The backlight according to  claim 1 , wherein the backlight is a modulator in a multi-modulation HDR display comprising a processor configured to perform color correction by accounting for the native color temperature of the HDR display. 
   
   
       9 . The backlight according to  claim 1 , wherein the heat sink and thermal properties of the backlight are designed to maintain an optimal temperature for at least one of LED life and a desired color temperature of the LEDs. 
   
   
       10 . A multi-modulation display comprising a backlight having a heat sink and other thermally conductive materials configured to maintain a constant operating temperature of the backlight. 
   
   
       11 . The multi-modulation display according to  claim 10 , wherein the constant operating temperature comprises a temperature that maximizes backlight longevity. 
   
   
       12 . The multi-modulation display according to  claim 10 , wherein the constant operating temperature comprises a temperature that maintains a desired color temperature of the backlight. 
   
   
       13 . The multi-modulation display according to  claim 11 , wherein the backlight comprises an array a LEDs comprising a first modulator, an LCD panel comprises a second modulator, and the first modulator if configured to produce an approximation of the desire image and project it onto the second modulator which is configured to further modulate the approximated image to produce a desired image. 
   
   
       14 . The multi-modulation display according to  claim 10 , wherein the constant operating temperature comprises a temperature that maintains a temperature of optimal efficiency of the backlight. 
   
   
       15 . The multi-modulation display according to  claim 14 , wherein the optimal efficiency is an optimal efficiency of an LED of the backlight. 
   
   
       16 . The multi-modulation display according to  claim 10 , further comprising a modulator configured to, during operation of the display, further modulate light emitted from the backlight. 
   
   
       17 . The multi-modulation display according to  claim 16 , wherein the modulator comprises a passive modulator. 
   
   
       18 . The multi-modulation display according to  claim 17 , wherein the passive modulator comprises an LED panel. 
   
   
       19 . A High Dynamic range display comprising:
 A backlight comprising an active array of RGB LEDs, and a passive modulator comprising an LCD panel including a series a RGB filters matched to the wavelengths of the RGB LEDs, wherein the backlight further comprises a heat sing and thermally conductive vias for maintaining a desired temperature during operation of the display.   
   
   
       20 . The HDR display according to  claim 19 , further comprising a temperature mechanism configured to monitor an operating temperature of the backlight.