Led driver, light-emitting module, and display device for local dimming
A light-emitting diode (LED) driver configured to generate an LED driving current based on an input signal may include a terminal exposed to outside, a controller configured to identify a first identifier and data from the input signal, identify a second identifier based on a signal applied to the terminal, and when the first identifier and the second identifier are identical to each other, generate a control signal based on the data. The LED driver further may further include a current source configured to generate the LED driving current based on the control signal.
1. A light-emitting module comprising:
a light-emitting diode (LED) array comprising a plurality of LEDs;
an LED driver array comprising a plurality of LED drivers configured to respectively generate a plurality of LED driving currents respectively corresponding to the plurality of LEDs based on an input signal; and
a board on which the LED array and the LED driver array are mounted, wherein the board comprises:
a plurality of first patterns each connecting two adjacent LED drivers with each other among the plurality of LED drivers such that a first LED driver receives a first input signal from a second LED driver through at least one of the plurality of first patterns, the first LED driver and the second LED driver being adjacent to each other and included in a same row of the LED driver array; and
a plurality of second patterns respectively connected to the plurality of LED drivers such that a unique signal is applied to each of the plurality of LED drivers,
wherein the first LED driver comprises a repeater configured to generate a second input signal by amplifying the first input signal, and
the second input signal is transmitted through at least one of the plurality of first patterns from the first LED driver to a third LED driver adjacent to the first LED driver in the same row of the LED driver array.
2. The light-emitting module of claim 1 , wherein the plurality of second patterns comprises:
a second pattern configured to apply a first common signal to LED drivers included in each row of the LED driver array; and
a second pattern configured to apply a second common signal to LED drivers included in each column of the LED driver array.
3. The light-emitting module of claim 1 , wherein each of the plurality of second patterns is configured to be applied by at least one of a constant voltage, a constant current and a constant resistance.
4. The light-emitting module of claim 1 , wherein the board further comprises a plurality of third patterns connected to two adjacent LED drivers of the plurality of LED drivers such that LED drivers included in a first column among columns of the LED driver array receive the input signal in a chain.
5. The light-emitting module of claim 1 , wherein the board further comprises at least one fourth pattern commonly connected to LED drivers included in a first column such that the LED drivers included in the first column among columns of the LED driver array commonly receive the input signal.
6. A light-emitting module comprising:
a light-emitting diode (LED) array comprising a plurality of LEDs;
an LED driver array comprising a plurality of LED drivers configured to respectively generate a plurality of LED driving currents respectively corresponding to the plurality of LEDs based on an input signal; and
a board on which the LED array and the LED driver array are mounted, wherein the board comprises:
a plurality of first patterns each connecting two adjacent LED drivers with each other among the plurality of LED drivers such that LED drivers included in each row of the LED driver array receive the input signal in a chain; and
a plurality of second patterns respectively connected to the plurality of LED drivers such that a unique signal is applied to each of the plurality of LED drivers,
wherein the board further comprises:
at least one fifth pattern connected to each of a plurality of end LED drivers such that a deactivated enable signal is applied to an end LED driver that finally receives the input signal in each row of the LED driver array; and
at least one sixth pattern connected to each of other LED drivers except for the plurality of end LED drivers such that an activated enable signal is applied to the other LED drivers except for the end LED driver in each row of the LED driver array.