Display apparatus
A display apparatus includes: a display panel including a plurality of subpixels; a control printed circuit board including a first driving voltage line, a power management circuit, and at least one first feedback driving voltage line electrically connected to the power management circuit; a source printed circuit board electrically connected between the display panel and the control printed circuit board, the source printed circuit board including at least one second driving voltage line electrically connected to at least one of the subpixels; and at least one flexible flat cable connected between the source printed circuit board and the control printed circuit board. The first driving voltage line may be electrically connected to the at least one second driving voltage line through the at least one flexible flat cable, and the at least one first feedback driving voltage line may be electrically connected to the at least one flexible flat cable.
1 . A display apparatus, comprising:
a display panel including a plurality of subpixels;
a control printed circuit board including a first driving voltage line, at least one second driving voltage line branched from the first driving voltage line, a power management circuit, and at least one first feedback driving voltage line electrically connected to the power management circuit;
a source printed circuit board electrically connected between the display panel and the control printed circuit board, the source printed circuit board including at least one third driving voltage line electrically connected to at least one of the subpixels; and
at least one flexible flat cable connected between the source printed circuit board and the control printed circuit board,
wherein a second driving voltage line, among the at least one second voltage line, is branched to a second-first driving voltage line and a second-second driving voltage line on the control printed circuit board,
wherein a third driving voltage line, among the at least one third voltage line, is branched to a third-first driving voltage line and a third-second driving voltage line on the source printed circuit board,
wherein the second-first driving voltage line is connected to the third-first driving voltage line through a flexible flat cable, among the at least one flexible flat cable, and the second-second driving voltage line is connected to the third-second driving voltage line through the flexible flat cable, and
wherein the at least one first feedback driving voltage line is electrically connected to the at least one flexible flat cable.
2 . The display apparatus of claim 1 , wherein the power management circuit is configured to control a supply of a driving voltage to the at least one third driving voltage line via the first driving voltage line and the at least one second voltage line based on a voltage at a sensing node electrically connected to the at least one first feedback driving voltage line.
3 . The display apparatus of claim 2 , wherein the power management circuit includes:
a power supply circuit configured to receive power for turning on the power management circuit; and
a high-potential voltage sensing circuit configured to sense the voltage at the sensing node and to turn the power supply circuit on or off based on the sensed voltage at the sensing node.
4 . The display apparatus of claim 3 , wherein the high-potential voltage sensing circuit is further configured to:
maintain the power supply circuit on if the sensed voltage at the sensing node is greater than or equal to a predetermined reference voltage; and
turn the power supply off if the sensed voltage at the sensing node is less than the predetermined reference voltage.
5 . The display apparatus of claim 3 , wherein:
the power management circuit further includes a voltage supply circuit configured to provide the driving voltage to the at least one third driving voltage line via the first driving voltage line, the at least second driving voltage line, and the at least one flexible flat cable; and
the voltage supply circuit and the high-potential voltage sensing circuit are configured to operate only while the power supply circuit is turned on.
6 . The display apparatus of claim 1 , wherein:
the source printed circuit board further includes a second feedback driving voltage line branched from the second driving voltage line; and
a first feedback driving voltage line, among the at least one first feedback driving voltage line, is electrically connected to the second feedback driving voltage line through the flexible flat cable.
7 . The display apparatus of claim 1 , wherein:
the at least one flexible flat cable includes a plurality of flexible flat cables; and
the first driving voltage line and the at least one first feedback driving voltage line are electrically connected to the plurality of flexible flat cables.
8 . The display apparatus of claim 7 , wherein the at least one second driving voltage line branched from the first driving voltage line includes a plurality of second driving voltage lines electrically connected to the plurality of flexible flat cables, respectively.
9 . The display apparatus of claim 7 , wherein the at least one first feedback driving voltage line includes a plurality of first feedback driving voltage lines joined and connected to a sensing node electrically connected to the power management circuit.
10 . The display apparatus of claim 9 , wherein:
the at least one third driving voltage line includes a plurality of third driving voltage lines;
a plurality of second feedback driving voltage lines are branched respectively from the plurality of second driving voltage lines;
a pull-up resistor is disposed in each of the plurality of first feedback driving voltage lines or in each of the plurality of second feedback driving voltage lines; and
a pull-down resistor is connected between the sensing node and the ground.
11 . The display apparatus of claim 1 , wherein the flexible flat cable comprises:
a first drive pin electrically connected between the second-first driving voltage line and the third-first driving voltage line; and
a second drive pin electrically connected between the second-second driving voltage line and the third-second driving voltage line.
12 . The display apparatus of claim 11 , wherein the flexible flat cable further comprises a feedback pin electrically connected to a first feedback driving voltage line, among the at least one first feedback driving voltage line.
13 . A display apparatus, comprising:
a display panel including a plurality of subpixels;
a control printed circuit board including:
a first driving voltage line;
a second driving voltage line branched from the first driving voltage line;
a second-first driving voltage line and a second-second driving voltage line each branched from the second driving voltage line; and
a first feedback driving voltage line;
a source printed circuit board connected to the display panel and including:
a third driving voltage line electrically connected to at least one of the subpixels; and
a third-first driving voltage line, a third-second driving voltage line, and a second feedback driving voltage line each branched from the third driving voltage line; and
a flexible flat cable configured to connect the source printed circuit board with the control printed circuit board, to electrically connect the second-first driving voltage line with the third-first driving voltage line, to electrically connect the second-second driving voltage line with the third-second driving voltage line, and to electrically connect the first feedback driving voltage line with the second feedback driving voltage line,
wherein the control printed circuit board is configured to sense an electrical disconnection between the first feedback driving voltage line and the second feedback driving voltage line.
14 . The display apparatus of claim 13 , wherein:
the control printed circuit board further comprises a power management circuit;
the power management circuit comprises a high-potential voltage sensing circuit and a power supply circuit;
the power supply circuit is configured to receive power for turning on the power management circuit; and
the high-potential voltage sensing circuit is electrically connected to the first feedback driving voltage line.
15 . The display apparatus of claim 14 , wherein:
the first feedback driving voltage line is connected to a sensing node in the control printed circuit board;
a pull-up resistor is disposed in the first feedback driving voltage line or in the second feedback driving voltage line; and
a pull-down resistor is connected between the sensing node and the ground.
16 . The display apparatus of claim 15 , wherein the high-potential voltage sensing circuit is configured to sense a voltage at the sensing node and to turn the power supply circuit on or off based on the sensed voltage at the sensing node.
17 . The display apparatus of claim 16 , wherein the high-potential voltage sensing circuit is further configured to:
maintain the power supply circuit on if the sensed voltage at the sensing node is greater than or equal to a predetermined reference voltage; and
turn the power supply circuit off if the sensed voltage at the sensing node is less than the predetermined reference voltage.
18 . The display apparatus of claim 16 , wherein:
the power management circuit further includes a voltage supply circuit configured to provide a driving voltage to the third driving voltage line via the first driving voltage line, the second driving voltage line, and the flexible flat cable; and
the voltage supply circuit and the high-potential voltage sensing circuit are configured to operate only while the power supply circuit is turned on.
19 . The display apparatus of claim 13 , wherein the first driving voltage line and the first feedback driving voltage line are disposed respectively in different layers on the control printed circuit board.
20 . The display apparatus of claim 13 , wherein the flexible flat cable comprises:
a first drive pin to electrically connect the second-first driving voltage line with the third-first driving voltage line;
a second drive pin to electrically connect the second-second driving voltage line with the third-second driving voltage line; and
a feedback pin to electrically connect the first feedback driving voltage line with the second feedback driving voltage line.
21 . The display apparatus of claim 1 , wherein, on the control printed circuit board:
the at least one second driving voltage line branched from the first driving voltage line includes a plurality of second driving voltage lines connected to and joined at an ingress node connected directly to the first driving voltage line; and
the at least one first feedback driving voltage line includes a plurality of first feedback driving voltage lines joined and connected to a sensing node electrically connected to the power management circuit.