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US 11,107,386 B2Granted
Pixel diagnostics with a bypass mode
AssigneeLumileds LLC
InventorRonald Bonne
Life of this patent
Estimating the term…
Abstract
A LED controller includes an image buffer to hold image data. An LED pixel forming a part of a large pixel array is activatable in response to image data, LDO state, and pulse width modulation module state. A logic module including a pixel diagnostic mode using an LDO bypass is connected to modify LDO state and allow direct addressing of the LED pixel for diagnostic purposes without needing to use image data from the image buffer.
Claims12
A light-emitting diode (LED) controller, comprising:
- an image buffer to hold image data;
- a pulse width modulator that has a duty cycle;
- an LED pixel activatable in response to the image data and the duty cycle;
- a logic circuit configured to use a low dropout (LDO) bypass to modify a state of an LDO linear regulator, a row select and a column select configured to select the LED pixel for activation when using the LDO bypass, the logic circuit including a bypass input with the LED controller being configured to receive an input on a bias voltage line and produce an output on a forward voltage line;
- and
- a generator supplied with a data input.
3 more elements
A method, comprising:
- activating a light-emitting diode (LED) pixel in response to image data held in an image buffer and a duty cycle of a pulse width modulator;
- modifying a state of a low dropout (LDO) linear regulator, at least in part based on an LDO bypass;
- selecting the LED pixel for activation when using the LDO bypass, at least in part based on a row select and a column select;
- receiving a data input at a generator;
- receiving, by a logic circuit, a bypass input;
- receiving an input on a bias voltage line;
- and
- producing an output on a forward voltage line.
5 more elements
Dependencies are inferred from the claim text.