KR100828316B1 - Plasma Display Driving Device And Driving Method for the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display driving device and a driving method, and more particularly, to a plasma display driving device and a driving method for increasing a bias voltage applied to a sustain electrode when a panel temperature rises to a predetermined reference temperature or more. In accordance with an aspect of the present invention, a plasma display driving apparatus and a driving method according to the present invention are configured to amplify an existing sustain bias voltage according to the detected temperature and apply the sustain bias voltage to a sustain electrode driving circuit according to the detected temperature. It is not necessary to change the sustain electrode driving circuit, such as having a separate voltage source and a plurality of control signals or switching elements for driving the voltage source to boost the voltage, so the configuration is simple and the production cost is reduced accordingly. It has the advantage of being improved.

Plasma Display, Z Bias, Drive Signal, Temperature, Regulator

Description

Plasma display driving device and driving method

1 is a view showing a drive signal waveform of a conventional plasma display driving apparatus;

2 is a view showing a drive signal waveform of the plasma display driving apparatus according to the present invention;

3 is a block diagram showing the configuration of a plasma display driving apparatus according to the present invention;

4 is a diagram illustrating a Z bias voltage generation circuit of a conventional plasma display driving apparatus.

5 is a circuit diagram for explaining the operation of the regulator IC used in the present invention;

6 is a Z bias voltage amplifying circuit of the plasma display driving apparatus according to the present invention;

7 is a view showing a Z electrode driving circuit of the plasma display driving apparatus according to the present invention;

8 is a view illustrating a state in which a plasma display driving apparatus according to the present invention is mounted on a panel;

9 is a flowchart illustrating a plasma display driving method according to the present invention.

<Explanation of symbols on main parts of the drawings>

100: DC / DC converter 200: photo coupler

300, TL: Regulator IC R1.R2.R3: Resistance

Vzb: Z bias voltage Vzup: Additional voltage

40: sustain electrode driver 50: power supply

60: temperature detector 70: controller

80: voltage regulator 81: constant voltage holding unit

82 boosting unit CS: control signal

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display driving device and a driving method, and more particularly, to a plasma display driving device and a driving method for increasing a bias voltage applied to a sustain electrode when a panel temperature rises to a predetermined reference temperature or more. It is about.

The conventional plasma display driving apparatus is as follows.

FIG. 1 is a diagram showing waveforms of driving signals applied to the scan electrode Y, the sustain electrode Z, and the address electrode X during one subfield by a conventional plasma display driving apparatus.

In the conventional plasma display apparatus, the bias voltage Vzb is applied to the sustain electrode Z from the time when the set-down period is started on the scan electrode Y.

The bias voltage Vzb applied to the sustain electrode Z sustains wall charges so as to form a wall charge distribution that is favorable for sustain discharge to occur in the sustain electrode from the set-down period of the reset period to the address period (section A). The voltage applied to hold the electrode surface.

After the A section elapses, a sustain pulse is alternately applied to the scan electrode and the sustain electrode during the B section to discharge the discharge cells and generate light.

The conventional plasma display device applies a bias voltage of a fixed magnitude so that a voltage of a constant magnitude is always applied to the sustain electrode regardless of a temperature change of the panel.

However, in the plasma display apparatus, as the driving time becomes longer, the temperature of the entire panel is increased by discharge. In this case, the temperature of the elevated panel affects the charge accumulated in the discharge cells of the panel.

In particular, as the temperature increases, the wall charges formed on each electrode portion of the panel increase in activity due to heat, so that the wall charges cannot be bound by the voltage of the conventional driving signal, thereby preventing a desired wall charge distribution. In other words, the wall charges are attracted by the voltage applied to the electrode to make the distribution of wall charges favorable to the discharge, but the wall charges that deviate with the increase of the panel temperature increase, thereby causing a mis-discharge or a poor discharge phenomenon. There is this. In addition, there arises a problem that the image quality of the plasma display device is degraded due to such mis-discharge or poor discharge.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and its object is to provide a conventional bias voltage to a Z electrode using a regulator IC without an additional power supply when the panel temperature rises above a predetermined reference temperature. The present invention provides a plasma display driving device and a driving method for amplifying and boosting an applied Z bias voltage.

According to a characteristic of the plasma display driving apparatus according to the present invention for solving the above problems, a sustain electrode driver for driving a sustain electrode, a power supply for applying a sustain bias voltage to the sustain electrode driver, and a panel temperature And a voltage adjusting unit for amplifying the sustain bias voltage to increase the voltage when the temperature is higher than the reference temperature.

Here, the voltage adjusting unit includes a boosting unit for amplifying the sustain bias voltage and a constant voltage maintaining unit for maintaining the boosted voltage constant.

The plasma display driving apparatus may further include a temperature detector configured to detect a panel temperature, and a controller configured to apply a control signal to the power supply unit and the voltage adjuster according to the result of comparing the detected temperature with a predetermined reference temperature. It is configured to include.

In addition, according to a feature of the plasma display driving method according to the present invention for solving the above problems, a temperature detecting step of detecting the temperature of the panel, a comparison step of comparing the detected temperature with a predetermined reference temperature, and And a boosting step of driving the sustain electrode by amplifying the sustain bias voltage according to the comparison result.

In the boosting step, a bias voltage determination process of maintaining a basic sustain bias voltage when the detected temperature is less than a predetermined reference temperature and amplifying the basic sustain bias voltage when the detected temperature is greater than or equal to a predetermined reference temperature And a voltage application process for applying the determined bias voltage to the sustain electrode driving circuit.

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

2 is a view illustrating waveforms of driving signals of the plasma display driving apparatus according to the present invention.

Referring to FIG. 2, the plasma display driving apparatus according to the present invention is configured to generate / output a waveform of a driving signal in which a sustain bias voltage varies according to a panel temperature.

The sustain bias voltage is a driving signal applied to the sustain electrode from the set down period to the reset period of the reset section.

The driving signal applied to the sustain electrode is divided into three sections, A section, B section and C section.

The section A is a section in which a Z bias voltage is applied to the sustain electrode (hereinafter referred to as a Z electrode) at a general temperature below a predetermined temperature, and the section B is a section in which a higher Z bias voltage is applied when the panel temperature is above a predetermined temperature. The C section is a section to which a sustain pulse for sustain discharge is applied.

In the plasma display driving apparatus according to the present invention, when the panel temperature is room temperature, a constant voltage Vzb is applied to the sustain electrode as a bias voltage.

Next, if the panel temperature rises above the predetermined reference temperature, the voltage applied to the sustain electrode is amplified (Vzb + Vzup) and applied.

This reduces the wall charges that are lost / lost with increasing temperature.

Next, when a cell to be discharged is selected during the address period, a sustain pulse is applied to generate / maintain a discharge. (C section)

3 is a block diagram showing the configuration of a plasma display driving apparatus according to the present invention for outputting a driving signal as shown in FIG.

The plasma display driving apparatus according to the present invention includes a sustain electrode driver 40 for driving a sustain electrode, a power supply unit 50 for applying a sustain bias voltage to the sustain electrode driver 40, and a panel temperature at a predetermined reference temperature. In this case, the voltage regulator 80 may amplify the sustain bias voltage to increase the voltage.

In addition, the plasma display driving apparatus includes a temperature detector 60 that detects a panel temperature, and the detected temperature is compared with a predetermined reference temperature, and according to the result, the power supply unit 50 and the voltage regulator 80. It further comprises a control unit 70 for applying a control signal to the.

First, the power supply unit 50 generates / converts various power voltages for driving the plasma display device and applies them to each electrode driver. That is, various reference voltages necessary for generating a driving signal for driving the plasma display apparatus are generated. Primarily, the power supply unit 50 includes a DC / DC converter to generate power voltages of various levels.

The sustain electrode driver 40 includes various driver ICs and a sustain driver circuit. The sustain electrode driver 40 generates a drive signal (waveform) for driving the sustain electrode using a voltage applied from the power supply unit 50 to sustain the electrode. To apply.

In addition, the sustain electrode driver 40 generates a sustain drive signal by receiving a sustain voltage Vs, a sustain bias voltage (Z bias voltage, Vzb), and a boosted sustain bias voltage (Vzb + Vzup) from a power supply. Drive the electrode.

7 is a diagram illustrating a sustain electrode driving circuit of the plasma display device according to the present invention.

Referring to FIG. 7, the sustain electrode driver 40 includes a plurality of switching elements Q1 to Q8, an inductor and a capacitor used in an energy recovery circuit, and appropriately adjusts the switching elements according to a control signal. The driving waveform of FIG. 1 is applied. Detailed operation will be described later.

The temperature detector 60 measures a temperature of a driving circuit for driving a panel or other panel. The panel refers to a panel module in which an upper substrate and a lower substrate are bonded to generate a discharge. It is generally configured to detect the temperature of the panel by a temperature sensor attached to the panel back plate.

The temperature sensor may be mounted on the control board. It can be configured to measure the temperature of the aforementioned drive panel as well as other drive boards or drive drivers.

The temperature measured by the temperature detector 60 is converted into an electrical signal and transmitted to the controller 70.

The controller 70 is basically configured to generate / output a control signal to output different types of driving waveforms according to the detected temperature. That is, it is configured to generate / output a driving waveform signal for a specific temperature (low temperature / high temperature / room temperature).

According to an exemplary embodiment of the present invention, the control unit 70 is a microprocessor. When the temperature detected by the temperature detection unit 60 is compared with a predetermined reference temperature, the control unit 70 boosts the Z bias voltage (Vzb +). The control signal CS is generated and output and applied to the voltage adjusting unit 80.

In addition, the controller 70 generates and outputs a control signal to apply the basic Z bias voltage Vzb to the power supply unit 50 when the temperature detected by the temperature detector 60 is lower than a predetermined reference temperature. do.

The voltage adjusting unit 80 feeds back the output of the power supply unit 50 so that the voltage is stably supplied, and when the temperature of the panel is equal to or higher than a predetermined reference temperature, A booster 82 is configured to amplify and boost the output of the power supply unit 50 according to a control signal and then feed back to the power supply unit 50 via the constant voltage maintaining unit 81.

Here, the constant voltage holding unit 81 is configured to include a regulator IC to keep the output of the power supply unit 50 constant. That is, when the voltage output from the power supply unit 50 becomes irregular due to noise, the splashing voltage caused by noise or the like is removed and kept constant.

In addition, when the panel temperature is equal to or greater than a predetermined reference temperature, the input resistance of the input terminal load of the regulator IC is changed by the booster 82 to feed back the sustain bias voltage amplified by the regulator IC to the power supply 50. Let's do it.

Specific embodiments of the plasma display driving apparatus according to the present invention configured as described above will be described with reference to the drawings.

4 is a diagram illustrating a Z bias voltage generation circuit of a conventional plasma display driving apparatus.

In the conventional plasma display driving apparatus, the regulator IC 30 is used as the power supply unit and the constant voltage maintaining unit as the power control unit, thereby simply maintaining the output voltage of the DC / DC converter 10 at a constant voltage. Only. The output voltage of the DC / DC converter 10 is transmitted to the sustain electrode driver as a Z bias voltage Vzb, and the photocoupler 20 is connected by connecting the Z bias voltage Vzb to an input terminal of the regulator IC 30. It is configured to feed back to the DC / DC converter 10 to maintain a constant voltage.

FIG. 5 is a circuit diagram illustrating the operation of the regulator IC used in the present invention. Referring to FIG. 5 for a description of the basic operation of the regulator IC 30, two input terminals N1 of the regulator IC TL are provided. Load resistors are connected, one of which is connected to a first resistor (R1) connected to the input terminal and an output terminal (N2) of the power supply unit, and a second resistor (R2) connected to the input terminal and ground (GND) is connected to a constant voltage. Keep it.

The output of the regulator IC is expressed by Equation 1 below.

Where Vref is the reference voltage of the regulator IC. For the TL431 IC, Vref is 2.5V. Since the reference voltage varies depending on the type of regulator IC, a desired Z bias voltage can be obtained by using appropriate load resistance (R1, R2) values.

One embodiment of the plasma display driving apparatus according to the present invention is configured to amplify the Z bias voltage output by the power supply by adjusting the input load resistance of the regulator IC operating as described above.

6 is a diagram illustrating a Z bias voltage amplifying circuit of the plasma display driving apparatus according to the present invention.

One embodiment of the plasma display driving apparatus according to the present invention includes a DC / DC converter circuit 100 as a power supply unit, a regulator IC 300 and a photo coupler 200 as a voltage adjusting unit, and the photo coupler 200. Is for transmitting the output of the regulator IC 300 to the DC / DC converter circuit 200 and is not limited thereto, and may be implemented by other signal transfer devices.

Three resistor elements are connected to the input terminal N1 of the regulator IC 300, and the first resistor element R1 is an input terminal N1 of the regulator IC and an output terminal N2 of the DC / DC converter circuit 100. Is connected between the input terminal N1 of the regulator IC and the ground GND, and the third resistor element R3 is connected to the input terminal N1 of the regulator IC and the switching element. Is connected to and configured to be driven by the conduction of the switching element TR1.

Here, the third resistance element R3 and the switching element TR1 function as a boosting part.

That is, since the conventional power supply unit and the constant voltage holding unit (B1 of FIG. 6) are configured to amplify the sustain bias voltage by adding only a boosting unit (B2 of FIG. 6) composed of a resistor and a switching element, the configuration is simple.

Here, the operation of the plasma display driving apparatus according to the present invention according to the temperature of the panel will be described.

First, the temperature of the panel is measured by a temperature sensor, which is a temperature detector, and the controller compares the temperature with a predetermined reference temperature.

If the measured temperature is less than the reference temperature, the switching element TR1 is not operated and the output voltage of the regulator IC is maintained at Vzb. The Vzb voltage is calculated by the above equation (1).

If the measured temperature is greater than or equal to the reference temperature, the controller applies a control signal CS for conducting the switching element TR1.

When the switching element TR1 is turned on by the control signal CS, the output voltage is amplified as if the voltage Vzup is added to the Z bias voltage Vzb output from the DC / DC converter circuit 100.

That is, in detail, when the control signal CS is applied to the switching element TR1, the switching element is turned on, and the third resistance element R3 is connected to the ground GND, whereby The output of the regulator IC will be amplified to a voltage higher than the conventional Vzb voltage.

Here, the output of the regulator IC 300 is fed back so that the final bias voltage output by the DC / DC converter circuit 100 can be expressed by Equation 2 below.

As described above, the final amplified / boosted sustain bias voltage output by the power supply unit is applied to the sustain electrode driver (hereinafter referred to as the Z electrode driver circuit).

7 is a diagram illustrating a Z electrode driving circuit of a plasma display driving apparatus according to the present invention. Compared to FIG. 2, which is a Z electrode driving circuit for applying a voltage higher by a Vzup voltage to a conventional Vz voltage, FIG. Not required separately, a plurality of switching elements (Q3, Q4 in FIG. 2) and capacitance C1 for applying the Vzup power supply are not necessary. That is, the conventional sustain electrode drive circuit can be used as it is.

The amplified / boosted sustain bias voltage (Vzb _final ) finally outputted by the power supply and booster is connected to Vz, a portion to which the sustain bias voltage of FIG. Accordingly is applied to the panel.

Referring to the section-specific operation of the driving signal of FIG. 1, in order to generate the waveform of section A of FIG. 1, in FIGS. 6 and 7, Q1 and Q2 are turned on (current path 1), and in section B, Q1, Q2 and TR1 are all included. It is ON (current path 1) and C section operates so that Q1, Q2 and TR1 are all OFF.

FIG. 8 is a view schematically showing a plasma display driving apparatus mounted on a panel according to an embodiment of the present invention. FIG. 8 is a diagram illustrating an embodiment in which the above-mentioned plasma display driving apparatus is mounted on a plasma display apparatus.

First, a temperature sensor A, which is a temperature detector, is mounted on the control board, and the microprocessor MCM B compares the temperature of the temperature sensor A with a set reference temperature to supply a control signal to the sustain Z drive board. Is authorized.

The control signal is configured to operate the Vzb circuit or the Vzup circuit on the sustain drive board to apply a sustain bias voltage.

9 is a flowchart illustrating a plasma display driving method according to the present invention.

Referring to FIG. 9, the plasma display driving method according to the present invention will be described. First, the temperature Tp of the panel is detected (S500).

Herein, the temperature Tp of the panel includes not only a panel in which discharge occurs, but also a temperature of each driving circuit or each driving driver mounted on the panel, and at least any one of them may be detected.

Next, the detected panel temperature is compared with a predetermined reference temperature (S510). If the detected temperature Tp of the panel is equal to or greater than the reference temperature, the Z bias voltage applied from the power supply unit is amplified. It is applied to the driving circuit (S520, S540).

In this case, the Z bias voltage can be amplified / stepped up by adjusting the ratio of the load resistance of the input terminal of the regulator IC provided to maintain the conventional constant voltage.

In the case of amplifying / boosting the Z bias according to the present invention, it is to amplify the existing Z bias voltage itself, unlike adding to the conventional Z bias using a separate additional power source.

The reference temperature may be set to a temperature at which the distortion occurs in the wall charge distribution formed on the partition wall of the panel by increasing the temperature of the panel, and when the loss of the wall charge is increased by a specific percentage or more, The temperature at which the miss discharge occurs can be set to the reference temperature.

If the detected temperature Tp of the panel is less than the reference temperature, the Z bias voltage applied from the power supply unit is maintained without being amplified and applied to the Z electrode driving circuit (S530 and S540).

As described above, the plasma display driving apparatus and the driving method according to the present invention have been described with reference to the illustrated drawings. However, the present invention is not limited by the embodiments and the drawings disclosed herein, and the application within the scope of the technical idea is protected. Can be.

Plasma display driving apparatus and driving method according to the present invention configured as described above is to adjust the ratio of the load resistance of the regulator IC when the panel or the driving circuit of the panel or a specific element is a high temperature above a predetermined reference temperature is conventionally The configuration is simple without changing the Z electrode driving circuit, such as having a separate voltage source and a plurality of control signals or switching elements for driving the voltage source to boost the Z bias voltage by amplifying the applied Z bias voltage. And there is an advantage that the price competitiveness is improved by reducing the production cost accordingly.

Claims (9)

A sustain electrode driver for driving the sustain electrode; A power supply unit applying a sustain bias voltage to the sustain electrode driver; And a voltage adjusting unit for amplifying the sustain bias voltage to increase the voltage when the panel temperature is higher than a predetermined reference temperature. The voltage control unit, A boost unit amplifying the sustain bias voltage; And a constant voltage holding unit configured to maintain the boosted voltage at a constant level. delete The method according to claim 1, The constant voltage maintaining unit includes a regulator IC for feeding back the output of the power supply unit to reduce the voltage fluctuation. The method according to claim 3, The regulator IC is characterized in that the output voltage is adjusted by the ratio of the resistance value of the load connected to the input terminal of the regulator IC and the output terminal of the power supply, and the load connected to the input terminal and the ground of the regulator IC. The method according to claim 4, And the booster amplifies an output voltage of the regulator IC by changing a resistance value of a load connected to an input terminal of the regulator IC. delete delete delete delete

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