KR100741077B1 - Apparatus for driving display panel - Google Patents

Abstract

The present invention relates to a driving device of a display panel for controlling the connection of the electrode lines, the power input terminal and the ground terminal by a control switch to apply power to the electrode lines. According to an aspect of the present invention, there is provided a driving apparatus of a display panel, the driving apparatus of a display panel driving power by applying power to at least one voltage source from an electrode line, the apparatus comprising: a first control switch controlling a connection of the voltage source and the electrode line; A second control switch controlling the connection of the electrode line and the ground terminal; A first driver for applying a control signal to the first control switch; A second driver for applying a control signal to the second control switch; And a first input drive signal for controlling the first control switch and a second input drive signal for controlling the second control switch from the outside, wherein the first and second input drive signals are respectively input to the first and second control switches. In the case where the signal is 'on' all of the driving, characterized in that it comprises a protection unit for outputting the signal for driving both the 'off' driving the first and second control switch to the first and the second driver, respectively. According to the present invention, it is possible to prevent the driving signal data of the control switch controlling the connection between the electrode lines, the power input terminal, and the ground terminal to become high, thereby preventing the occurrence of dark short from the power input terminal through the ground terminal. .

Description

Apparatus for driving display panel

1 is a view showing an embodiment of the structure of a plasma display panel driven by the driving apparatus of the present invention.

FIG. 2 is a view schematically illustrating an electrode arrangement of the plasma display panel of FIG. 1.

FIG. 3 is a block diagram schematically illustrating an apparatus for driving a plasma display panel for driving the plasma display panel of FIG. 1.

4 is a timing diagram illustrating an embodiment of a drive signal output from each driver of FIG. 3.

FIG. 5 is a diagram schematically illustrating a protection unit for controlling a control signal applied to an electrode line to prevent dark short in a driving apparatus of a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 6 is a circuit diagram illustrating an X driver to which the protection part of FIG. 5 may be applied as an embodiment of the driving apparatus of the plasma display panel of the present invention.

FIG. 7 is a circuit diagram illustrating a Y driver to which the protection part of FIG. 5 may be applied as an embodiment of the driving apparatus of the plasma display panel according to the present invention.

<Explanation of symbols for the main parts of the drawings>

12: logic controller, 14, 600: Y drive unit,

18, 500: X driver, 16: address driver,

701: first driver, 702: second driver,

703: protection.

The present invention relates to a driving device of a display panel, and more particularly, to a driving device of a display panel for applying power to the electrode lines by controlling the connection of the electrode lines, the power input terminal and the ground terminal by a control switch. will be.

As flat panel display devices, plasma display panels (PDPs), which are easy to manufacture large panels, have attracted attention. A plasma display panel is a display device that displays an image by using a discharge phenomenon. In general, a plasma display panel can be classified into a direct current type and an alternating current type according to the type of driving voltage. Due to the disadvantages, the development of the AC plasma display panel has been made a lot.

An AC plasma display panel includes a three-electrode AC surface discharge type plasma display panel having three electrodes and driven by an AC voltage. A typical three-electrode surface discharge type plasma display panel is composed of a multi-layered plate, which is spatially advantageous because it can provide a thinner, lighter, and wider screen than a conventional cathode ray tube (CRT).

As an example of a conventional plasma display panel, a three-electrode surface discharge plasma display panel, a driving apparatus thereof, and a driving method thereof are disclosed in US Patent No. 6,744,218 (name: Method of driving a plasma display panel in which the). width of display sustain pulse varies). Matters related to the plasma display panel, the driving apparatus, and the driving method disclosed in the above-mentioned US patent are included in the present specification, and a detailed description thereof will be omitted.

The plasma display panel includes a plurality of display cells formed in an area where the sustain electrode and the address electrode cross each other, and one display cell includes three discharge cells (red, green, and blue). The gray level of the image is expressed by adjusting the discharge state.

In order to express the gray scale of the plasma display panel, one frame applied to the plasma display panel may be configured with eight subfields having different emission counts to express 256 gray scales. That is, in the case where the image is to be displayed with 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields. There is a reset period, an address period, and a sustain discharge period in each of the sub-fields to drive the plasma display panel.

In order to drive the plasma display panel, an operation of controlling the connection between each electrode and a power input terminal and controlling the connection between the electrode and the ground terminal is performed by control switches.

In this case, a sufficient dead time between data signals of a driving IC (Integrated Circuit) for controlling the control switches is not secured, and an arm short may occur from a power input terminal to a ground terminal in a transient state. There is this. In addition, there may be a problem such that the driving board is burned out.

The present invention is to solve the above problems, by preventing the driving signal data of the control switch for controlling the connection of the electrode line and the power input terminal and the ground terminal is all high, the arm through the ground terminal from the power input terminal An object of the present invention is to provide a driving device of a display panel which can prevent the occurrence of a short.

According to an aspect of the present invention, there is provided a driving apparatus for a display panel, the driving apparatus for a display panel driving power by applying power to at least one voltage source from an electrode line, wherein the connection between the voltage source and the electrode line is performed. A first control switch for controlling; A second control switch controlling the connection of the electrode line and the ground terminal; A first driver for applying a control signal to the first control switch; A second driver for applying a control signal to the second control switch; And a first input drive signal for controlling the first control switch and a second input drive signal for controlling the second control switch from the outside, wherein the first and second input drive signals are respectively input to the first and second control switches. In the case where all of the signals are 'on', the first and second control switches are provided with a protection unit for outputting a signal for driving both 'off' to the first and second driving units, respectively.

In the case where the protection unit, the signal for driving the first control switch 'on' is changed to a signal for 'off' driving, and the signal for driving the 'off' driving the second control switch is changed to a signal for 'on' driving When the time difference between the 'off' driving signal of the first control switch and the 'on' driving signal of the second control switch is 400 ns or less, it is preferable to drive the second control switch 'off'.

In the case where the protection unit, the signal for driving the second control switch 'on' is changed to a signal for 'off' driving, the signal for driving the first control switch 'off' is changed to a signal for 'on' driving When the time difference between the 'off' driving signal of the second control switch and the 'on' driving signal of the first control switch is 400 ns or less, it is preferable to drive the first control switch 'off'.

It is preferable that the said 1st and 2nd control switch is a field effect transistor provided with a drain terminal, a gate terminal, and a source terminal.

The first and second driving units operate by an operating voltage applied from the outside, and output the control signal to the gate terminals of the first and second control switches, and the first and second driving units and the first driving unit. It is preferable that a charging capacitor is connected between the source terminals of the first and second control switches.

It is preferable that the first control switch is a field effect transistor connected with the drain terminal to the voltage source, the gate terminal to the first driver, and the source terminal to the electrode line.

Preferably, the second control switch is a field effect transistor having a drain terminal connected to the electrode line, a gate terminal connected to the second driver, and a source terminal connected to the ground terminal.

According to another aspect of the present invention, there is provided a driving apparatus of a display panel, wherein the driving apparatus of the display panel is driven by applying power to an electrode line from at least one voltage source, the first control controlling a connection between the voltage source and the electrode line. switch; A second control switch controlling the connection of the electrode line and the ground terminal; And a first input drive signal for controlling the first control switch and a second input drive signal for controlling the second control switch from the outside, wherein the first and second input drive signals are respectively input to the first and second control switches. Is a signal for driving both 'on', the protection unit for driving both the first and second control switch 'off'.

According to the present invention, it is possible to prevent the driving signal data of the control switch controlling the connection between the electrode lines, the power input terminal, and the ground terminal to become high, thereby preventing the occurrence of dark short from the power input terminal through the ground terminal. .

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing an embodiment of the structure of a plasma display panel driven by the driving apparatus of the present invention.

Referring to the drawings, in between the first substrate 100 and second substrate 106 of the PDP, A electrodes (A _1, ..., A _m), the first and second dielectric layers (102 110 ), Y electrodes (Y ₁ , ..., Y _n ), X electrodes (X ₁ , ..., X _n ), phosphor layer 112, partition wall 114, and magnesium monoxide (MgO) protective layer 104 is provided.

The A electrodes A ₁ ,..., A _m are formed in a predetermined pattern on the second substrate 106 in the direction of the first substrate 100. A second dielectric layer 110 is applied so as to cover the A electrodes _{(A 1, ..., A m} ). The partition wall 114 is formed on second dielectric layer 110 are formed in a direction parallel to the A electrodes _{(A 1, ..., A m} ). The partition walls 114 function to partition the discharge region of each discharge cell and to prevent optical interference between the discharge cells. A phosphor layer 112 is the A electrodes between the barrier ribs (114) (A _1, ..., A _m) is first applied onto the second dielectric layer 110, in sequence a red light-emitting phosphor layers, green light-emitting fluorescent substance on the Layer and a blue light emitting phosphor layer are disposed.

X electrodes _{(X 1, ..., X n} ) and Y electrodes _{(Y 1, ..., Y n} ) is orthogonal to the second substrate such that the A electrodes _{(A 1, ..., A m} ) It is formed in a predetermined pattern on the first substrate 100 in the (106) direction. Each intersection sets a corresponding discharge cell. Each of the X electrodes (X ₁ , ..., X _n ) and each of the Y electrodes (Y ₁ , ..., Y _n ) may be formed of a transparent conductive material (X _na , Y _na )) and the metal electrodes X _nb and Y _nb for increasing conductivity may be formed. The first dielectric layer 102 is formed by covering the X electrodes X ₁ ,..., X _n and the Y electrodes Y ₁ ,..., And Y _n . A protective layer 104 for protecting the panel from a strong electric field, for example, a magnesium monoxide (MgO) layer, is formed over the entire surface to cover the first dielectric layer 102. The plasma forming gas is sealed in the discharge space 108.

Meanwhile, the plasma display panel driven by the driving apparatus of the present invention is not limited to that shown in FIG.

FIG. 2 is a view schematically illustrating an electrode arrangement of the plasma display panel of FIG. 1.

Referring to the drawings, the Y electrodes (Y ₁ ,..., Y _n ) and the X electrodes (X ₁ , ..., X _n ) are arranged side by side in parallel, and the A electrodes (A ₁ , ..., a _m) are arranged so as to cross the Y electrodes _{(Y 1, ..., Y n} ) and the X electrodes _{(X 1, ..., X n} ), the intersection region is a discharge cell ( Ce) is partitioned.

FIG. 3 is a block diagram schematically illustrating an apparatus for driving a plasma display panel for driving the plasma display panel of FIG. 1.

Referring to the drawings, the driving apparatus of the plasma display panel includes an image processor 10, a logic controller 12, a Y driver 14, an address driver 16, an X driver 18, and a plasma display panel 1. Equipped. The image processing unit 10 converts an external image signal from the outside and outputs it as an internal image signal, and the logic controller 12 receives an internal image signal, respectively, an address driving control signal S _A and a Y driving control signal ( S _Y ) and an X driving control signal S _X are output, and the Y driving unit 14, the address driving unit 16, and the X driving unit 18 receive driving control signals, respectively, and Y electrodes of the plasma display panel 1. And a driving signal is output to each of the A electrodes and the X electrodes.

4 is a timing diagram illustrating an embodiment of a drive signal output from each driver of FIG. 3.

Referring to FIG. 4, a unit frame for driving the plasma display panel (1 of FIG. 3) is divided into a plurality of subfields, and each subfield SF includes a reset period PR and an address period PA. And maintenance period PS.

First, in the reset period PR, a reset pulse consisting of a rising pulse and a falling pulse is applied to the Y electrodes Y ₁ , ..., Y _n , and in the X electrodes X ₁ , ..., X _n . When the falling pulse is applied, the second voltage (bias voltage) is applied to reset discharge. All discharge cells are initialized by reset discharge. The rising pulse rises from the sustain discharge voltage (Vs) by the rising voltage (V _set ) and finally reaches the rising maximum voltage (V _set + Vs), and the falling pulse falls from the sustain discharge voltage (Vs) and finally falls The voltage V _nf is reached.

In the address period PA, scanning pulses are sequentially applied to the Y electrodes Y ₁ ,..., And Y _n , and A electrodes A ₁ ,..., A _m are displayed in accordance with the scanning pulses. The data signal is applied to perform address discharge. The discharge cells to be subjected to the sustain discharge occurring in the sustain period PS by the address discharge are selected. The scan pulse has a scan high voltage (Vsch) and sequentially has a scan low voltage (Vscl) whose voltage is lower than the scan high voltage (Vsch), and the display data signal is adapted to the scan low voltage (Vscl) of the scan pulse. It has a positive address voltage Va.

In the sustain period PS, sustain pulses are alternately applied to the X electrodes X ₁ ,..., X _n and the Y electrodes Y ₁ ,..., Y _n to perform sustain discharge. Luminance is expressed according to the gray scale weight allocated to each subfield by the sustain discharge. The sustain pulse has an alternating discharge voltage Vs and a ground voltage Vg.

In this case, as shown in FIG. 5, the connection between the electrode line Y _i , the voltage source Vs and the ground terminal GND is controlled by the control switches S01 and S02, and the control switches S01. And S02 are driven by the driving ICs 701 and 702, respectively, and the protection switch 703 can simultaneously turn ON the control switches S01 and S02 to prevent the occurrence of an arm short.

On the other hand, it is possible to output a drive signal different from that shown in FIG. 4 in each of the driving units of FIG.

FIG. 5 is a diagram schematically illustrating a protection unit for controlling a control signal applied to an electrode line to prevent dark short in a driving apparatus of a plasma display panel according to an exemplary embodiment of the present invention.

Referring to the drawings, the driving device 710 of the plasma display panel includes a first control switch in the driving device of the display panel which is driven by applying power to the electrode line Y _i from at least one voltage source Vs. S01); A second control switch S02; A first driver 701; Second driver 702; And a protection unit 703.

The first control switch S01 controls the connection of the voltage source Vs and the electrode line Y _i . The second control switch S02 controls the connection between the electrode line Y _i and the ground terminal GND. The first driver 701 applies a control signal S _g1 to the first control switch S01. The second driver 702 applies a control signal S _g2 to the second control switch S02.

A first input drive signal (S _i1) and the second control switch a second input drive signal (S _i2), the input for controlling (S02) for controlling the first control switch (S01), the protection unit 703 from the outside When the first and second input driving signals S _i1 and S _i2 are signals for driving both the first and second control switches S01 and S02, respectively, the outputs to the second control switch (S01, S02) for all of each of the first and second driving units (701, 702) for "off (oFF), the signal (S _o1, S _o2) for driving.

The protection unit 703 changes the signal for driving the first control switch S01 'ON' to a signal for driving 'OFF' and turns the second control switch S02 'off'. (OFF) 'driving signal is changed to a' ON 'driving signal, the' ON 'driving signal of the first control switch (S01) value and the' 'of the second control switch (S02) ON 'drive signal is input at the same time, or the time difference between' OFF 'drive signal of the first control switch S01 and' ON 'drive signal of the second control switch S02 is 400ns In the following cases, it is preferable to drive the second control switch S02 'OFF'.

The protection unit 703, the signal for driving the second control switch (S02 'ON') is changed to the signal for driving the 'OFF (OFF), the first control switch (S01)' off ' (OFF) 'driving signal is changed to a' ON 'driving signal, the' ON 'driving signal of the first control switch (S01) value and the' 'of the second control switch (S02) ON 'drive signal is input simultaneously or time difference between' OFF 'drive signal of second control switch S02 and' ON 'drive signal of first control switch S01 is 400ns In the following cases, it is preferable to drive the first control switch S01 'OFF'.

That is, when the first control switch S01 and the second control switch S02 are ON at the same time or the time difference between the OFF / ON signal is 400 ns or less, Since the arm short is generated through the first and second control switches S01 and S02 and the ground terminal GND, and the driving board may be burned out, the first and second control switches S01 and S02 may be used. The control signals S _g1 and S _{g2 of} S1 can all be turned OFF to prevent arm short.

The first and second control switches S01 and S02 are preferably field effect transistors (FETs) including a drain terminal, a gate terminal, and a source terminal.

In this case, the first control switch (S01), the drain terminal is connected to the voltage source (Vs), the gate terminal is connected to the first driver 701, the source terminal is connected to the electrode line (Y _i ) Can be connected. The second control switch S02 has the drain terminal connected to the electrode line Y _i , the gate terminal connected to the second driver 702, and the source terminal connected to the ground terminal GND. It can be connected with.

The first and second drivers 701 and 702 operate by an operating voltage applied from the outside, and control the control signals S _g1 and S _g2 to the first and second control switches S01 and S02. The charging capacitor Cc is preferably connected between the first and second driving units 701 and 702 and the source terminals of the first and second control switches S01 and S02. .

FIG. 6 is a circuit diagram illustrating an X driver to which the protection part of FIG. 5 may be applied as an embodiment of the driving apparatus of the plasma display panel of the present invention.

Referring to the drawings, the driving apparatus of the plasma display panel according to the present invention includes a first voltage applying unit 511 for outputting a first voltage Vs in order to output a driving signal to the X electrodes (the first end of Cp). And a sustain pulse applying unit 510 including a ground voltage applying unit 512 for outputting a ground voltage Vg, a second voltage applying unit 505 for outputting a second voltage Vb, and a charge in the panel. And an energy recovery unit 520 for accumulating or storing charge in the panel, and a switching unit 507.

The first voltage applying unit 511 includes a first switching element S1 having one end connected to the first voltage source Vs and the other end connected to the switching unit 507. The ground voltage applying unit 512 includes a second switching element S2 having one end connected to the ground and the other end connected to the switching unit 507. In the sustain pulse applying unit 510 including the first voltage applying unit 511 and the ground voltage applying unit 512, the first switching element S1 and the second switching element S2 alternate with each other to generate a sustain pulse. Is turned on.

In this case, as shown in FIG. 5, the connection between the electrode line X _i , the voltage source Vs and the ground terminal GND is controlled by the control switches S1 and S2, and the control switches S1. , S2 is driven by the driving ICs 701 and 702, respectively, and the control switch S1 and S2 are simultaneously turned ON by the protection unit 703 in FIG. 5 to generate an arm short. You can prevent it.

The third switching element S3 has one end connected to the second voltage source Vb and the other end connected to the X electrodes (first end of Cp) and the switching unit 507 of the panel. ). The third switching device S3 is turned on and the second voltage Vb is output to the X electrodes C1 of the panel.

The energy recovery unit 520 accumulates in the panel Cp an energy storage unit 521 for storing charges in the panel Cp, and charges connected to the energy storage unit 521 and stored in the energy storage unit 521. An energy recovery switching unit 522 for controlling the storage of the charge in the panel Cp in the energy storage unit 521, one end of which is connected to the energy recovery switching unit 522 and the other end of the X electrodes Cp of the panel; An inductor L1 connected to the first stage).

The energy storage unit 521 may include a capacitor C2 to store charge in the panel. The energy recovery switching unit 522 includes a fourth switching device S4 and a fifth switching device S5 having one end connected to the energy storage unit 521 and the other end connected to the inductor L1. Two first and second diodes D1 and D2 having different directions may be connected between the device S4 and the fifth switching device S5.

Referring to the operation of the energy recovery unit 520, when the fifth switching device (S5) of the energy recovery switching unit 522 is turned on, the charge in the panel is inductor (L1), the second diode (D2), 5 is stored in the second capacitor C2 via the switching element S5. When the fourth switching device S4 of the energy recovery switching unit 522 is turned on, the charge stored in the second capacitor C2 is transferred to the fourth switching device S4, the first diode D1, and the inductor L2. Is accumulated in the panel Cp through

One end of the switching unit 507 is connected to the sustain pulse applying unit 510, and the other end thereof is connected between the second voltage applying unit 505 and the X electrodes (first end of Cp) of the panel and ground. 6 switching elements S6 are provided. The switching unit 507 performs a switching operation to apply the sustain pulse output from the sustain pulse applying unit 510 to the X electrodes of the panel, and the second voltage Vb output from the second voltage applying unit 505. ) Does not flow to the sustain pulse applying unit 510. That is, the sixth switching element S6 is turned on to apply the sustain pulse to the X electrodes (first end of the Cp) of the panel, and the second voltage Vb does not flow to the sustain pulse applying unit 510. To be turned off.

FIG. 7 is a circuit diagram illustrating a Y driver to which the protection part of FIG. 5 may be applied as an embodiment of the driving apparatus of the plasma display panel according to the present invention.

Referring to the drawings, the driving apparatus of the plasma display panel according to the present invention outputs the first voltage Vs to the first node N1 in order to output the driving signal to the Y electrodes (the second end of the Cp). A sustain pulse applying unit 610 including a first voltage applying unit 611 and a ground voltage applying unit 612 for outputting a ground voltage Vg to the first node N1, and one end of the first node N1. ) Is connected to the second end and the other end is connected to the second node (N2) including a first switching unit 605 including a seventh switching element (S17), one end is connected to the second node (N2) and the other end is a third node A second switching unit 617 including a fifteenth switching element S15 connected to N3 and a first voltage Vs is connected between the first node N1 and the second node N2. The third voltage applying unit 607 gradually increases by three voltages Vset and outputs the second voltage to the second node N2, and is connected to the third node N3, and the first voltage Vs is connected to the fourth voltage Vnf. Gradually lowering the output to the third node (N3) And a fourth voltage applying unit 609 and a first scan switching element SC1 and a second scan switching element SC2 connected in series with each other, and include a first scan switching element SC1 and a second scan switching element SC2. The fourth node N4 between the first and second nodes includes a scan switching unit 601 connected to the Y electrodes (second end of Cp) of the panel, a fifth voltage source Vsch, and a first scan switching element SC1. ) Is connected to a fifth voltage applying unit 603 that outputs a fifth voltage Vsch to the first scan switching element SC1, and a third node N3 and a second scan switching element SC2. A sixth voltage applying unit 615 for outputting a sixth voltage Vscl and an energy recovery unit 620 for accumulating charge in the panel Cp or storing charge in the panel Cp are provided.

The first voltage applying unit 611 includes an eighth switching element S8 having one end connected to the first voltage source Vs and the other end connected to the first node N1. The ground voltage applying unit 612 includes a ninth switching element S9 having one end connected to the ground and the other end connected to the first node N1. In the sustain pulse applying unit 610 including the first voltage applying unit 611 and the ground voltage applying unit 612, the eighth switching element S8 and the ninth switching element S9 alternate with each other to generate a sustain pulse. Is turned on.

In this case, as shown in FIG. 5, the connection between the electrode line Y _i , the voltage source Vs and the ground terminal GND is controlled by the control switches S8 and S9, and the control switches S8. And S9 are driven by the driving ICs 701 and 702, respectively, and the control switch S8 and S9 are simultaneously turned ON by the protection unit 703 in FIG. 5 to generate an arm short. You can prevent it.

The third voltage applying unit 607 has one end connected to the first node N1 and the other end connected to the third voltage source Vset, the third voltage source Vset and the second node ( A tenth switching element S10 connected between N3) is provided. The seventh switching device S7 of the first switching unit 605 is turned off, the fifteenth switching device of the second switching unit 617 is turned on, and the eighth switching device of the first voltage applying unit 611. S8 and the tenth switching element S10 of the third voltage applying unit 607 are turned on and gradually rise from the first voltage Vs by the third voltage Vset to finally increase the maximum voltage Vset + Vs. ) Is output to the third node N3.

The fourth voltage applying unit 609 includes an eleventh switching element S11 having one end connected to the third node N3 and the other end connected to the fourth voltage source Vnf. The eighth switching element S8 of the first voltage applying unit 611, the seventh switching element S7 of the first switching unit 605, the fifteenth switching element S15 of the second switching unit 617, and the fifth The eleventh switching element S11 of the four voltage applying unit 609 is turned on and a voltage gradually lowered from the first voltage Vs to the fourth voltage Vnf is output to the third node N3.

The sixth voltage applying unit 615 includes a twelfth switching element S12 connected between the third node N3 and the sixth voltage source Vscl. The twelfth switching element S12 is turned on and outputs a sixth voltage Vscl to the third node N2.

When the first scan switching device SC1 of the scan switching unit 601 is turned on and the second scan switching device SC2 is turned off, the fifth voltage Vsch passes through the fourth node N4 to Y electrodes. It is output to (the second stage of Cp). On the other hand, when the first scan switching device SC1 of the scan switching unit 601 is turned off and the second scan switching device SC2 is turned on, each voltage output to the third node N3, that is, the first voltage (Vs), ground voltage (Vg), rising maximum voltage (Vs + Vset), fourth voltage (Vnf), and sixth voltage (Vscl) pass through the fourth node (N4) to the second terminal of the Y electrodes (Cp). )

The energy recovery unit 620 stores the charge in the panel Cp and the energy storage unit 621 and the charges connected to the energy storage unit 621 and stored in the energy storage unit 621 in the panel Cp or An energy recovery switching unit 622 for controlling the storage of the charge in the panel Cp in the energy storage unit 621, and one end thereof is connected to the energy recovery switching unit 622, and the other end thereof is connected to the first node N1. Inductor L2 is provided.

The energy storage unit 621 may include a capacitor C5 to store the charge in the panel. The energy recovery switching unit 622 includes a thirteenth switching element S13 and a fourteenth switching element S14 having one end connected to the energy storage unit 621 and the other end connected to the inductor L2. Two third and fourth diodes D3 and D4 having different directions may be connected between the element S13 and the fourteenth switching element S14.

According to the driving device of the display panel according to the present invention, the driving signal data of the control switch for controlling the connection of the electrode lines and the power input terminal and the ground terminal is prevented from becoming high, and a dark shot from the power input terminal through the ground terminal Can be prevented.

Therefore, it is possible to prevent burnout of the drive board due to the dark short.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, it is merely an example, and those skilled in the art may realize various modifications and equivalent other embodiments therefrom. I can understand. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

Claims (10)

In the driving device of the display panel for driving by applying power to the electrode line from at least one voltage source, A first control switch controlling a connection of the voltage source and the electrode line; A second control switch controlling the connection of the electrode line and the ground terminal; A first driver for applying a control signal to the first control switch; A second driver for applying a control signal to the second control switch; And A first input drive signal for controlling the first control switch and a second input drive signal for controlling the second control switch are input from the outside, and the first and second input drive signals respectively control the first and second control switches. And a protection unit configured to output a signal for driving both of the first and second control switches to the 'off' driving to the first and second driving units, respectively. The method of claim 1, The protection unit, In the case where the signal for driving the first control switch 'on' is changed to the signal for 'off' driving, and the signal for driving 'off' the second control switch is changed to a signal for 'on' driving, the first The 'on' drive signal of the control switch and the 'on' drive signal of the second control switch are simultaneously input, or the time difference between the 'off' drive signal of the first control switch and the 'on' drive signal of the second control switch is 400ns. In the following case, the driving device of the display panel for driving the second control switch 'off'. The method of claim 1, The protection unit, In the case where the signal for driving the second control switch 'on' is changed to the signal for 'off' driving, and the signal for driving the first control switch 'off' is changed to the signal for 'on' driving, the first The 'on' drive signal of the control switch and the 'on' drive signal of the second control switch are simultaneously input, or the time difference between the 'off' drive signal of the second control switch and the 'on' drive signal of the first control switch is 400 ns. In the following case, the driving device of the display panel for driving the first control switch 'off'. The method of claim 1, And the first and second control switches are field effect transistors each having a drain terminal, a gate terminal, and a source terminal. The method of claim 4, wherein The first and second driving units operate by an operating voltage applied from the outside, and output the control signal to the gate terminals of the first and second control switches, and the first and second driving units and the first driving unit. A driving device of a display panel, wherein a charging capacitor is connected between the source terminals of the first and second control switches. The method of claim 1, And a first effect switch, a drain terminal is connected to the voltage source, a gate terminal is connected to the first driver, and a source terminal is a field effect transistor connected to the electrode line. The method of claim 1, And a second effect switch, a drain terminal connected to the electrode line, a gate terminal connected to the second driver, and a source terminal connected to the ground terminal. In the driving device of the display panel for driving by applying power to the electrode line from at least one voltage source, A first control switch controlling a connection of the voltage source and the electrode line; A second control switch controlling the connection of the electrode line and the ground terminal; And A first input drive signal for controlling the first control switch and a second input drive signal for controlling the second control switch are input from the outside, and the first and second input drive signals respectively control the first and second control switches. And a protection unit for driving both of the first and second control switches to 'off' when the signals are all 'on' driven. The method of claim 8, The protection unit, In the case where the signal for driving the first control switch 'on' is changed to the signal for 'off' driving, and the signal for driving 'off' the second control switch is changed to a signal for 'on' driving, the first The 'on' drive signal of the control switch and the 'on' drive signal of the second control switch are simultaneously input, or the time difference between the 'off' drive signal of the first control switch and the 'on' drive signal of the second control switch is 400ns. In the following case, the driving device of the display panel for driving the second control switch 'off'. The method of claim 8, The protection unit, In the case where the signal for driving the second control switch 'on' is changed to the signal for 'off' driving, and the signal for driving the first control switch 'off' is changed to the signal for 'on' driving, the first The 'on' drive signal of the control switch and the 'on' drive signal of the second control switch are simultaneously input, or the time difference between the 'off' drive signal of the second control switch and the 'on' drive signal of the first control switch is 400 ns. In the following case, the driving device of the display panel for driving the first control switch 'off'.

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