Apparatuses, systems, and methods for MicroLED (mLED) backplane architectures
AssigneeForth Dimension Display, Ltd
InventorChristopher Robert Chalmers
Life of this patent
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Abstract
Method, apparatuses, and systems are described to display image data to a sub-pixel within a micro-LED (mLED) display. A sub-pixel image data value is stored at the sub-pixel. The sub-pixel is turned to an ON state. A shared row counter value is provided to the sub-pixel. The shared row counter value and the sub-pixel image data value are compared at the sub-pixel. The sub-pixel is turned to an OFF state if the shared row counter value is equal to or greater than the sub-pixel image data value.
Claims11
A method to drive a sub-pixel micro-light emitting diode (mLED) of a micro-LED (mLED) display, comprising:
- driving a damp voltage onto an anode of the sub-pixel mLED only when the sub-pixel LED is in an OFF state;
- and
- initiating an ON state for the sub-pixel mLED, the initiating further comprising:
- applying a pre-charge voltage in a form of a pulse to the sub-pixel mLED for a first period of time only during the ON state, wherein the pre-charge voltage is greater than the clamp voltage;
- and
- emitting light from the sub-pixel mLED during the ON state, the emitting continues for a second period of time, wherein the first period of time overlaps with the second period of time and the second period of time is greater than the first period of time.
A computer-readable storage medium storing program code for causing a data processing system to perform the steps comprising:
- driving a clamp voltage onto an anode of a sub-pixel micro-light emitting diode (mLED) of a mLED display only when the sub-pixel mLED is in an OFF state;
- and
- initiating an ON state for the sub-pixel mLED, the initiating further comprising:
- applying a pre-charge voltage in a form of a pulse to the sub-pixel mLED for a first period of time only during the ON state, wherein the pre-charge voltage is greater than the clamp voltage;
- and
- emitting light from the sub-pixel mLED during the ON state, the emitting continues for a second period of time, wherein the first period of time overlaps with the second period of time and the second period of time is greater than the first period of time.
A system to drive sub-pixel micro-light emitting diodes (mLEDs) of a micro-LED (mLED) display, comprising:
- a sub-pixel mLED having an anode and a cathode;
- a sub-pixel mLED current control transistor, configured to output a drive current;
- a sub-pixel mLED enable transistor, an input of the sub-pixel mLED enable transistor coupled to an output of the sub-pixel mLED current control transistor and an output of the sub-pixel mLED enable transistor is coupled to the anode of the sub-pixel mLED;
- a switchable pre-charge voltage, the switchable pre-charge voltage injectable between the sub-pixel mLED current control transistor and the sub-pixel mLED enable transistor;
- a switchable clamp voltage, the switchable clamp voltage injectable between the sub-pixel mLED enable transistor and the anode of the sub-pixel mLED;
- and
- a sub-pixel control module, the sub-pixel control module configured to drive the sub-pixel mLED as follows in order:
- A. sub-pixel mLED OFF state, the switchable clamp voltage is switched ON;
- B. sub-pixel mLED ON state, the pre-charge voltage is switched ON for a first period of time and the sub-pixel mLED enable transistor passes the drive current to the sub-pixel mLED for a second period of time, where the first period of time overlaps with the second period of time and the second period of time is longer than the first period of time.
Dependencies are inferred from the claim text.