Techniques for dynamic voltage control for laser diodes in head-wearable display devices

Abstract

The present disclosure relates generally to a device, such as a wearable display device configured with a laser diode driver implementing dynamic voltage control for laser diodes. The laser diodes may include one or more of a red laser diode, a blue laser diode, and a green laser diode. The device may determine a load condition based on a frame to be displayed at the device, and determine a target voltage level for a laser diode operably coupled to the laser diode driver of the device based on the load condition (e.g., an image signal processor (ISP) frame buffer load). The device may generate the target voltage level for the laser diode based on a base voltage level. For example, the device may be configured with a voltage booster operably coupled to the laser diode driver to provide the target voltage level in addition to the base voltage level.

1 .- 20 . (canceled) 
     
     
         21 . A method, comprising:
 determining a target voltage level for a laser diode operably coupled to a laser diode driver in a head wearable display device based at least in part on a load condition, wherein the load condition is based at least in part on a frame buffer load; and   providing the target voltage level to the laser diode.   
     
     
         22 . The method of  claim 21 , wherein the frame buffer load is associated with a number of pixels of a frame in a frame buffer of an image signal processor in the head wearable display device. 
     
     
         23 . The method of  claim 22 , wherein the frame buffer load corresponds to pixel colors associated with the number of pixels. 
     
     
         24 . The method of  claim 21 , wherein determining the target voltage level comprises referencing a voltage table comprising a set of target voltage levels comprising the target voltage level. 
     
     
         25 . The method of  claim 21 , wherein providing the target voltage level to the laser diode is based at least in part on a base voltage level. 
     
     
         26 . The method of  claim 25 , further comprising:
 selecting the base voltage level for the laser diode based at least in part on a power configuration associated with the laser diode.   
     
     
         27 . The method of  claim 26 , further comprising:
 determining a set of base voltage levels based at least in part on the power configuration, wherein each base voltage level of the set of base voltages levels corresponds to a respective load condition,   wherein selecting the base voltage level for the laser diode is based at least in part on the load condition.   
     
     
         28 . The method of  claim 27 , further comprising:
 determining a laser diode forward voltage drop associated with the laser diode,   wherein selecting the base voltage level for the laser diode is based at least in part on the laser diode forward voltage drop and the load condition.   
     
     
         29 . The method of  claim 28 , further comprising:
 determining a power headroom associated with the laser diode,   wherein selecting the base voltage level for the laser diode is based at least in part on the laser diode forward voltage drop, the load condition, and the power headroom.   
     
     
         30 . A head wearable display device comprising:
 a laser diode;   a laser diode driver operably coupled to the laser diode; and   a processor operably coupled to the laser diode driver, the processor to:
 determine a target voltage level for the laser diode based at least in part on a load condition, wherein the load condition is based at least in part on a frame buffer load; and 
 provide the target voltage level to the laser diode. 
   
     
     
         31 . The head wearable display device of  claim 30 , further comprising:
 a frame buffer, wherein the frame buffer load is associated with a number of pixels of a frame stored in the frame buffer.   
     
     
         32 . The head wearable display device of  claim 31 , wherein the frame buffer load corresponds to pixel colors associated with the number of pixels. 
     
     
         33 . The head wearable display device of  claim 31 , the processor to determine the load condition based at least in part on the frame stored in the frame buffer. 
     
     
         34 . The head wearable display device of  claim 30 , the processor to determine the target voltage level by referencing a voltage table comprising a set of target voltage levels comprising the target voltage level. 
     
     
         35 . The head wearable display device of  claim 30 , wherein providing the target voltage level to the laser diode is based at least in part on a base voltage level. 
     
     
         36 . The head wearable display device of  claim 35 , the processor to select the base voltage level for the laser diode based at least in part on a power configuration associated with the laser diode. 
     
     
         37 . The head wearable display device of  claim 36 , the processor to:
 determine a set of base voltage levels based at least in part on the power configuration, wherein each base voltage level of the set of base voltages levels corresponds to a respective load condition, wherein selecting the base voltage level for the laser diode is based at least in part on the load condition; and   determine a laser diode forward voltage drop associated with the laser diode, wherein selecting the base voltage level for the laser diode is based at least in part on the laser diode forward voltage drop and the load condition.   
     
     
         38 . The head wearable display device of  claim 37 , the processor to:
 determine a power headroom associated with the laser diode, wherein selecting the base voltage level for the laser diode is based at least in part on the laser diode forward voltage drop, the load condition, and the power headroom.   
     
     
         39 . An image signal processor for a head wearable display device, the image signal processor to:
 determine a target voltage level for a laser diode operably coupled to a laser diode driver in the head wearable display device based at least in part on a load condition, wherein the load condition is based at least in part on a frame buffer load; and   provide the target voltage level to the laser diode.   
     
     
         40 . The image signal processor of  claim 39 , wherein the frame buffer load is associated with a number of pixels of a frame in a frame buffer of the image signal processor.