Mechanical non-binary brixel and brixel display

1. A system comprising:

a center column:

comprising a tube; and

defining a column of drive windows arranged along the tube at a vertical pixel pitch distance;

a set of bearing collars, each bearing collar in the set of bearing collars coupled to the center column adjacent a drive window, in the column of drive windows, and defining a vertical thrust surface;

a set of brixel units, each brixel unit in the set of brixel units located adjacent a drive window, in the set of drive windows on the center column, and comprising:

a pixel element comprising:

a first face defining a first visual characteristic; and

a second face opposite the first face and defining a second visual characteristic different from the first visual characteristic; and

an internal ring gear coupled to the pixel element and defining an axis of rotation of the pixel element;

a bearing housing:

coupled to the pixel element;

configured to carry a vertical load of the pixel element into a vertical thrust surface of a bearing collar, in the set of bearing collars, adjacent the drive window; and

rotationally coupling the pixel element to the center column;

a motor arranged in the drive window;

a drive pinion:

coupled to the output shaft of the motor; and

extending through the drive window to engage the internal ring gear; and

a local controller:

configured to store an actuation routine in local memory at the brixel unit; and

configured to drive the motor to locate the pixel element over a sequence of angular positions, relative to the center column, defined by the actuation routine; and

a primary controller configured to distribute a set of actuation routines to the set of brixel units.

2. The system of claim 1 :

further comprising:

a second center column:

arranged adjacent a laterally offset from the center column by a horizontal pitch distance;

comprising a second tube; and

defining a second column of drive windows arranged along the second tube at the vertical pixel pitch distance; and

a second set of bearing collars, each bearing collar in the second set of bearing collars coupled to the second center column adjacent a drive window, in the second column of drive windows, and defining a vertical thrust surface; and

a second set of brixel units, each brixel unit in the second set of brixel units located adjacent a drive window, in the second set of drive windows, on the second center column; and

wherein the primary controller is further configured to:

distribute a second set of actuation routines to the second set of brixel units; and

trigger local controllers in the set of brixel units and the second set of brixel units to execute actuation routines stored in local memory at the set of brixel units and the second set of brixel units.

3. The system of claim 2 , further comprising a base configured to support and locate the center column and the second center column in parallel vertical orientations with the second center column laterally offset from the center column by the horizontal pitch distance approximating a sum of:

a width of pixel elements in the set of brixel units; and

a rotation clearance width of pixel elements in the set of brixel units.

4. The system of claim 2 , wherein a local controller in each brixel unit, in the set of brixel units and the second set of brixel units, is configured to:

read a first target angular position from an actuation routine assigned to the brixel unit by the primary controller;

read a first angular speed profile from the actuation routine;

read a first direction from the actuation routine;

receive a start command issued by the primary controller;

drive a motor of the brixel unit to rotate a pixel element of the brixel unit from a current angular position to the first target angular position along the first direction and according to the first angular speed profile responsive to receiving the start command;

read a second target angular position from the actuation routine;

read a second angular speed profile from the actuation routine;

read a second direction from the actuation routine; and

drive the motor to rotate the pixel element from the first angular position to the second target angular position along the second direction and according to the second angular speed profile.

5. The system of claim 1 , wherein an output shaft of a motor, a drive pinion, and an internal ring gear of a brixel unit in the set of brixel units define a planetary gearbox assembled over and extending through the tube of the center column at a drive window in the set of drive windows.

6. The system of claim 1 :

wherein the center column comprises a continuous cylindrical tube relieved to form the column of drive windows along a length of the continuous cylindrical tube; and

wherein a pixel element of each brixel unit, in the set of brixel units, is configured to rotate about a rotational axis coaxial with the continuous cylindrical tube.

7. The system of claim 1 :

wherein a pixel element of each brixel unit in the set of brixel units comprises:

a first face defining a first optical transparency; and

a second face defining a second optical transparency less than the first optical transparency; and

wherein each brixel unit, in the set of brixel units, further comprises a light element:

coupled to the center column proximal a drive window, in the set of drive windows; and

enclosed by a pixel element of the brixel unit.