DISPLAY AND DISCHARGING DEVICE OF THE SAME
A display including a display panel having a plurality of gate lines connected to a plurality of pixels, a gate driving unit which sequentially provides a gate turn-on voltage to the plurality of gate lines and provides a control voltage to the plurality of gate lines to which the gate turn-on voltage is not applied, and a discharging unit including a first input terminal receiving the gate turn-on voltage, a second input terminal receiving a first gate turn-off voltage, a output terminal outputting the control voltage and a short-circuit protection unit which prevents short-circuiting between the first input terminal and the second input terminal. The discharging unit provides the control voltage to the gate driving unit and a voltage level of the control voltage changes to any one level of a gate turn-on voltage and a first gate turn-off voltage response to a supply voltage.
1 . A display, comprising:
a display panel comprising a plurality of gate lines connected to a plurality of pixels;
a gate driving unit which sequentially provides a gate turn-on voltage to the plurality of gate lines and provides a control voltage to the plurality of gate lines to which the gate turn-on voltage is not applied; and
a discharging unit comprising a first input terminal receiving the gate turn-on voltage, a second input terminal receiving a first gate turn-off voltage, a output terminal outputting the control voltage and a short-circuit protection unit which prevents short-circuiting between the first input terminal and the second input terminal,
wherein the discharging unit provides the control voltage to the gate driving unit and a voltage level of the control voltage changes to any one level of a gate turn-on voltage and a first gate turn-off voltage response to a supply voltage.
2 . The display as claimed in claim 1 , wherein the discharging unit outputs the first gate turn-off voltage as the control voltage while the supply voltage is applied to the display and uses the gate turn-on voltage at a point when the supply voltage is not applied to the display.
3 . The display as claimed in claim 1 , wherein the discharging unit further comprises:
a first switching unit which outputs the first gate turn-off voltage as the control voltage while the supply voltage is applied;
a charge storage unit which stores the gate turn-on voltage; and
a second switching unit which outputs the stored gate turn-on voltage as the control voltage at a point when the supply voltage is not applied.
4 . The display as claimed in claim 3 , wherein the short-circuit protection unit is connected to the first input terminal and provides the gate turn-on voltage to the charge storage unit.
5 . The display as claimed in claim 3 , wherein the first switching unit comprises:
a first transistor comprising an emitter connected to the second input terminal and a collector connected to an output terminal;
a first resistor connected to a base of the first transistor and a ground; and
a second resistor connected to the collector of the first transistor and the ground.
6 . The display as claimed in claim 5 , wherein the short-circuit protection unit comprises a third resistor connected to the first input terminal and an output terminal.
7 . The display as claimed in claim 6 , wherein the charge storage unit comprises:
a first diode connected to the output terminal and an input terminal of the second switching unit;
a fourth resistor connected to the output terminal and a ground;
first and second capacitors connected in series between the input terminal of the second switching unit and the ground;
a fifth resistor connected in parallel with the second capacitor;
third and fourth capacitors connected in series between the input terminal of the second switching unit and the ground; and
a sixth resistor connected in parallel with the fourth capacitor.
8 . The display as claimed in claim 7 , wherein the second switching unit comprises:
a second transistor comprising an emitter connected to the input terminal of the second switching unit;
a collector connected to an output terminal; and
a seventh resistor connected to a base of the second transistor and the output terminal of the short-circuit protection unit.
9 . The display as claimed in claim 5 , wherein the short-circuit protection unit comprises a switching device which turns on and off depending on an amount of current flowing at the gate turn-on voltage.
10 . The display as claimed in claim 1 , wherein each of the plurality of pixels comprises a thin film transistor, wherein the gate turn-on voltage turns on the thin film transistor, and the first gate turn-off voltage turns off the thin film transistor.
11 . The display as claimed in claim 1 , further comprising:
a driving-voltage generating unit which generates the gate turn-on voltage, the first gate turn-off voltage and a second gate turn-off voltage according to the supply voltage; and
a gate clock generating unit which generates a gate clock signal, a gate clock bar signal and a second vertical synchronization start signal using the gate turn-on voltage, the second gate turn-off voltage and a first vertical synchronization start signal,
wherein the gate driving unit comprises a plurality of stages respectively connected to the plurality of gate lines, and
the plurality of stages sequentially provide the gate turn-on signal to the plurality of gate lines according to the gate clock signal, the gate clock bar signal and the second vertical synchronization start signal.
12 . The display as claimed in claim 1 , wherein the gate driving unit is formed at one side of the display panel.
13 . The display as claimed in claim 1 , wherein the gate driving unit is manufactured in the form of an IC chip to be connected to the plurality of gate lines of the display panel.
14 . The display as claimed in claim 1 , wherein the discharging unit is provided on a printed circuit board electrically connected to the display panel via a flexible printed circuit board or on the flexible printed circuit board.
15 . A discharging device of a display which supplies a gate turn-off voltage to the display panel while a supply voltage is applied and which supplies a gate turn-on voltage to the display panel at a point when the supply voltage is not applied, the discharging device comprising a short-circuit protection unit which prevents short-circuiting between an input terminal of the gate turn-on voltage and an input terminal of a first gate turn-off voltage.
16 . The discharging device as claimed in claim 15 , further comprising:
a first switching unit which supplies the gate turn-off voltage to the display panel while the supply voltage is being applied to the display;
a charge storage unit which stores the gate turn-on voltage; and
a second switching unit which supplies the stored gate turn-on voltage to the display panel at the point when the supply voltage is not applied to the display.
17 . The discharging device as claimed in claim 15 , wherein the short-circuit protection unit is connected to the input terminal of the gate turn-on voltage and supplies the gate turn-on voltage to the charge storage unit.
18 . The discharging device as claimed in claim 17 , wherein the short-circuit protection unit comprises a resistor.
19 . The discharging device as claimed in claim 17 , wherein the short-circuit protection unit comprises a switching device which turns on and off depending on an amount of current flowing at the gate turn-on voltage.