Display device and method for controlling same
A display device includes: Light Emitting Diode (LED) blocks connected in series; a driver Integrated Circuit which supplies a current to the LED blocks and is connected in series to one of the LED blocks; switching elements connected in parallel to the LED blocks; and a controller for controlling on/off of the switching elements to adjust which LED block to supply the current, over a time for implementing a unit frame.
1. A display device, comprising:
a plurality of Light Emitting Diode (LED) blocks configured to be connected in series;
a driver Integrated Circuit (IC) configured to:
supply a current to the plurality of LED blocks, and
be connected in series to a first LED block of the plurality of LED blocks;
a plurality of switching elements configured to be connected in parallel to the plurality of LED blocks; and
a controller configured to control on/off of the plurality of switching elements to adjust one of the plurality of LED blocks, to which the current is supplied, over a time for implementing a unit frame,
wherein the time for implementing the unit frame includes a first time period, a second time period, and a third time period, and
wherein the first time period indicates a time period corresponding to a first half of the time for implementing the unit frame, the second time period indicates a time period corresponding to a first half of a remaining half of the time for implementing the unit frame, and the third time period indicates a time period corresponding to a last quarter of the time for implementing the unit frame.
2. The display device of claim 1 , wherein the controller is further configured to:
divide the time for implementing the unit frame into a plurality of time periods,
control on/off of the plurality of switching elements to supply the current to a portion of the plurality of LED blocks in a first portion of the plurality of time periods, and
control on/off of the plurality of switching elements to supply the current to all of the plurality of LED blocks in a second portion of the plurality of time periods.
3. The display device of claim 2 , further comprising:
a power supply configured to be connected in series to a second LED block of the plurality of LED blocks to supply a drive voltage (VDD),
wherein the controller is further configured to control the power supply to adjust the drive voltage supplied to the plurality of LED blocks over the time for implementing the unit frame.
4. The display device of claim 3 , wherein the controller is further configured to control the power supply to increase or decrease the drive voltage supplied to the LED block in response to an increase or a decrease in a number of LED blocks of the plurality of LED blocks to which the current is supplied according to on/off status of a switching element.
5. The display device of claim 4 , wherein the controller is further configured to:
control the power supply to increase the drive voltage in response to the increase in the number of LED blocks to which the current is supplied, and
control the power supply to decrease the drive voltage in response to the decrease in the number of LED blocks to which the current is supplied.
6. The display device of claim 5 , wherein the plurality of LED blocks comprise:
a third LED block; and
a fourth LED block configured to be connected in series to the third LED block,
wherein the plurality of switching elements comprise:
a first switching element configured to be connected in parallel to the third LED block; and
a second switching element configured to be connected in parallel to the fourth LED block.
7. The display device of claim 6 , wherein
the controller is further configured to control both the first switching element and the second switching element to be turned off for the first time period.
8. The display device of claim 7 , wherein the controller is further configured to control the first switching element to be turned off and control the second switching element to be turned on for the second time period, and
control the first switching element to be turned on and control the second switching element to be turned off for the third time period.
9. The display device of claim 8 , wherein the controller is further configured to control the power supply to supply a voltage equivalent to twice a drive voltage required for operation of a single LED block for the first time period, and supply a drive voltage required for operation of a single LED block for the second time period and the third time period.
10. The display device of claim 9 , wherein the controller is further configured to control the driver IC to output the current according to data to be emitted from the LED block.
11. The display device of claim 10 , wherein the controller is further configured to control the plurality of LED blocks to represent a luminance using one of a Pulse Width Modulation (PWM) control or a Pulse Amplitude Modulation (PAM) control.
12. A method for controlling a display device including a plurality of Light Emitting Diode (LED) blocks connected in series, a driver Integrated Circuit (IC) to supply a current to the plurality of LED blocks and be connected in series to a first LED block of the plurality of LED blocks, and a plurality of switching elements connected in parallel to the plurality of LED blocks, the method comprising:
determining one of the plurality of LED blocks, to which the current is supplied, over a time for implementing a unit frame; and
controlling on/off of the plurality of switching elements to supply the current to the determined one of the plurality of LED blocks,
wherein the time for implementing the unit frame includes a first time period, a second time period, and a third time period, and
wherein the first time period indicates a time period corresponding to a first half of the time for implementing the unit frame, the second time period indicates a time period corresponding to a first half of a remaining half of the time for implementing the unit frame, and the third time period indicates a time period corresponding to a last quarter of the time for implementing the unit frame.
13. The method of claim 12 , wherein the controlling of on/off of the plurality of switching elements further comprises:
dividing the time for implementing the unit frame into a plurality of time periods,
controlling on/off of the plurality of switching elements to supply the current to a portion of the plurality of LED blocks in a first portion of the plurality of time periods, and
controlling on/off of the plurality of switching elements to supply the current to all of the plurality of LED blocks in a second portion of the plurality of time periods.
14. The method of claim 13 , further comprising:
adjusting a drive voltage supplied to the plurality of LED blocks over the time for implementing the unit frame.
15. The method of claim 14 , wherein the adjusting of the drive voltage comprises increasing or decreasing the drive voltage supplied to the LED block in response to an increase or a decrease in a number of LED blocks of the plurality of LED blocks to which the current is supplied according to on/off status of a switching element.