SYSTEM AND METHOD OF A MICRO-LED PIXEL DIGITAL DRIVING CIRCUIT
A micro-LED pixel digital driving circuit is disclosed herein, that comprises micro-LED pixels, a time sequence control circuit module, a data buffer conversion module, and a reference current supply module. The reference current supply module is in current supply connection with the micro-LED pixels; the time sequence control circuit module comprises a time sequence control unit, a subframe control unit and one or more subframe control switches. The data buffer conversion module comprises an external data input port, a memory, and one or more data transmission switches. The gates of data transmission switches are connected to the data output ports of the memory respectively. The external data input port is arranged on the input end of the memory. The digital micro-LED pixel driving system disclosed herein drives the micro-LED pixels to display images on a display screen.
1 . A micro light-emitting digital driving circuit, comprising:
one or more micro-light-emitting-diode (micro-LED) pixels;
a time sequence control circuit module;
a data buffer conversion module; and
a reference current supply module;
wherein:
the time sequence control circuit module comprises a time sequence control unit, a subframe control unit and one or more subframe control switches,
the data buffer conversion module comprises an external data input port, a memory and one or more data transmission switches, and
the reference current supply module is configured to supply constant current to the one or more micro-LED pixels.
2 . The micro light-emitting digital driving circuit according to claim 1 , wherein the data buffer conversion module further comprises a bit conversion unit arranged on a first input end of the memory, and configured for converting a bit data format of an input image data.
3 . The micro light-emitting digital driving circuit according to claim 2 , wherein a number of the one or more subframe control switches and a number of the one or more data transmission switches are the same, and the number is configured to be n=2 k , wherein k is a non-negative integer.
4 . The micro light-emitting digital driving circuit according to claim 2 , wherein a number of the one or more subframe control switches and a number of the one or more data transmission switches are the same, and the number is selected according to a number of bits of the input image data.
5 . The micro light-emitting digital driving circuit according to claim 1 , wherein each of the one or more subframe control switches comprises a source electrode, a drain electrode, and a gate, and each of the one or more data transmission switches comprises a source electrode, a drain electrode, and a gate.
6 . The micro light-emitting digital driving circuit according to claim 5 , wherein:
one or more source electrodes of the one or more subframe control switches are connected to a current mirror of the reference current supply module;
one or more drain electrodes of the one or more subframe control switches are respectively connected to one or more drain electrodes of the one or more data transmission switches; and
one or more source electrodes of the one or more data transmission switches are respectively connected to the one or more micro-LED pixels.
7 . The micro light-emitting digital driving circuit according to claim 5 , wherein:
one or more gates of the one or more subframe control switches are respectively connected to one or more output ports on the subframe control unit;
the time sequence control unit is electrically connected to the subframe control unit; and
one or more gates of the one or more data transmission switches are respectively connected to one or more data output ports of the memory, and the external data input port is arranged on a second input end of the memory.
8 . The micro light-emitting digital driving circuit according to claim 1 , wherein:
the reference current supply module comprises a current source and a current mirror, wherein the current source is electrically connected to a first end of the current mirror, and a second end of the current mirror is in current supply connection with the one or more micro-LED pixels.
9 - 15 . (canceled)
16 . The micro light-emitting digital driving circuit according to claim 8 , wherein a current supplied by the current mirror to the one or more micro-LED pixels is the same as a current supplied by the current source.
17 . The micro light-emitting digital driving circuit according to claim 1 , wherein the subframe control unit is configured to control global brightness of each of the one or more micro-LED pixels, and each of the one or more micro-LED pixels is connected to a same set of subframe control switches for brightness control.
18 . The micro light-emitting digital driving circuit according to claim 1 , wherein the one or more subframe control switches are high-voltage transistors.
19 . The micro light-emitting digital driving circuit according to claim 1 , wherein the data transmission switches are high-voltage transistors.
20 . A digital driving method, comprising:
providing a micro light-emitting digital driving circuit, the micro light-emitting digital driving circuit comprising a time sequence control circuit module and a data buffer conversion module, wherein:
the time sequence control circuit module comprises a time sequence control unit, a subframe control unit and one or more subframe control switches; and
the data buffer conversion module comprises a bit conversion unit, an external data input port, a memory and one or more data transmission switches;
inputting input image data frame by frame, through the external data input port; and
storing the input image data in the memory.
21 . The digital driving method according to claim 20 , comprising:
converting a bit data format of the input image data through the bit conversion unit, so that bits of the input image data are aligned with the one or more data transmission switches and the one or more subframe control switches;
transmitting the bits of the input image data to one or more micro-LED pixels through the one or more data transmission switches; and
controlling a time sequence of the bits of the input image data through the time sequence control circuit module according to an image playback requirement.
22 . The digital driving method according to claim 21 , wherein a number of the one or more subframe control switches and a number of the one or more data transmission switches are the same, and the number is configured to be n=2 k , wherein k is a non-negative integer.
23 . The digital driving method according to claim 22 , wherein the number is 1, the bits of the input image data comprise a plurality of bits, and wherein transmitting the bits of the input image data to the one or more micro-LED pixels through the one or more data transmission switches comprises:
transmitting the plurality of bits of the input image data in the memory to the one or more micro-LED pixels in a position sequence or a random order of the plurality of bits through at least one of the one or more data transmission switches for display.
24 . The digital driving method according to claim 23 , wherein controlling the time sequence of the bits of the input image data through the time sequence control circuit module according to the image playback requirement comprises:
configuring the one or more subframe control switches according to weight of the plurality of bits of the input image data for driving and controlling of grayscale and brightness of an output display image.
25 . The digital driving method according to claim 22 , wherein the number is greater than 1, the bits of the input image data comprise a plurality of bits, and wherein transmitting the bits of the input image data to the one or more micro-LED pixels through the one or more data transmission switches comprises:
transmitting the plurality of bits of the input image data in the memory to the one or more micro-LED pixels according to weight of the plurality of the bits of the input image data through the one or more data transmission switches sequentially for display.
26 . The digital driving method according to claim 25 , wherein controlling the time sequence of the bits of the input image data through the time sequence control circuit module according to the image playback requirement comprises:
configuring the one or more subframe control switches sequentially according to weight of the plurality of bits of the input image data for driving and controlling of grayscale and brightness of an output display image.
27 . The digital driving method according to claim 19 , wherein configuring the one or more subframe control switches sequentially according to weight of the plurality of bits of the input image data comprises:
sequentially controlling a conduction time and a disconnection time of the one or more subframe control switches according to the weight of the plurality of bits of the input image data.
28 . The digital driving method according to claim 20 , wherein the conduction time of a respective one of the one or more subframe control switches is equal to a duty cycle of a respective one of the plurality of bits of the input image data.
29 . The digital driving method according to claim 22 , wherein the number is greater than 1, the bits of the input image data comprise a plurality of bits, and wherein transmitting the bits of the input image data to the one or more micro-LED pixels through the one or more data transmission switches comprises:
transmitting a first portion and a second portion sequentially of the plurality of bits of the input image data in the memory to the one or more micro-LED pixels through the one or more data transmission switches for display.