KR20000003327A - Variable voltage apparatus of control white valance for pdp - Google Patents

Abstract

PURPOSE: A variable voltage apparatus of control white valance for PDP is provided to adjust a white valance by changing a loading voltage according to characteristics having respective RGB fluorescence. CONSTITUTION: An apparatus according to the present invention is designed in order to control white balances of PDP. We can vary the input voltage in consideration of the characteristics of the RGB fluorescence, and control white balances of PDP efficiently. If several shift registers and buffers that imposition voltage to each electrode for RGB fluorescence are provided and we drive different voltages to each RGB fluorescence via several shift registers and buffers, then the rate of radiation of the RGB fluorescence is considered, and we can control white balances of PDP efficiently.

Description

Voltage Variable Device for White Balance Control of PD

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage variable device for controlling the white balance of a PDP. A variable voltage apparatus of control of white valance for PDP.

In the image display method of a TV, a CRT, which is a general TV system, adopts a method in which an electron gun sequentially scans pixel by pixel, and a gray scale is composed of a simple driving circuit driven by an analog method, and the driving speed is several tens of nanoseconds. It is very fast (ns), but when the number of pixels increases to millions such as HDTV, it becomes very difficult to implement the driving of millions of pixels by one pixel. However, in the case of the PDP, which is a flat panel display, a matrix driving method using strong nonlinearity characteristics of gas discharge is used instead of scanning by pixel.

Here, the nonlinearity is a feature of gas discharge, and since the gas discharge phenomenon is caused by ionization through the ionization process of the gas, the discharge occurs only when a voltage is applied above the discharge voltage at which the ionization reaction can sufficiently occur. The voltage refers to a characteristic of gas discharge in which no discharge occurs.

In addition, the PDP is generally driven by a continuous pulse having a constant voltage, and the gray scale display is implemented by a digital method rather than an analog method, but since a gas discharge usually requires a relatively high voltage of several hundred volts, it amplifies an image signal. To drive. Therefore, the reason why the above-mentioned PDP is suitable for enlargement is that not only the process but also the characteristics useful for the enlargement of gas discharge can be applied to the driving method.

The driving operation of the PDP is classified into three types: a selection operation, a holding operation, and an erasing operation. The selection operation is a driving operation necessary for initial discharge formation, and is generally used in the PDP. In the case of the + Xe penning gas, a potential of 240 V to 280 V is applied. In the case of the AC PDP, a third electrode is introduced to reduce the high current caused by the sustain electrode and the parasitic capacitor caused by the dielectric in the surface discharge form, and a driving method in which the selection operation and the holding operation are separated is adopted. .

In addition, the holding operation is a driving operation in which discharge is maintained by a holding pulse having a lower voltage than a selection pulse by using the storage function characteristic of gas discharge. In the case of the AC type PDP, the storage function effect by wall charge By adopting the memory type driving method which can separate the selection operation and the holding operation by using the PDP, the PDP operates without degrading the luminance even for a large display element in the case of high gradation display for realizing a high quality display element. It provides a driving method that can be.

Here, in the case of the AC PDP, the discharge is formed at a low voltage in a period of neutralizing the wall charge so that the wall charge is not sufficiently formed, or an erase pulse having a short pulse width is applied to prevent the wall charge from reaching a steady state. To remove the wall charges.

In addition, the AC-type PDP has a unique memory function because charged particles such as electrons and ions formed in gas discharge form wall charges in the dielectric covering the electrode. That is, in the absence of discharge, wall charges do not exist in the dielectric material, and wall charges accumulate in the dielectric material when the discharge is formed. When the wall charges exist, the potential applied to the external electrode and the potential by the wall charge As a result, a discharge is formed at a low voltage. Therefore, it is possible to separate the operation of causing discharge without the help of the wall charge and the operation of causing the discharge at low potential by the help of the wall charge, and the characteristics of the AC type PDP having the characteristics described above. In this case, there is a memory function by wall charge, and various driving methods are used according to the method of using such wall charge.

1 is a view showing a state in which a voltage is applied to a data electrode formed on the panel of the PDP as described above. In the PDP panel 1, the sustain electrode 2 and the scan electrode 7 are horizontally aligned with each other. The data electrodes 3, 4, and 5 are arranged in a staggered state and perpendicularly perpendicular to the sustain electrode 2 and the scan electrode 7. Here, as shown in FIG. 1, since the sustain electrodes 2 and the scan electrodes 7 are not disposed on the same side, since the horizontal lines 480 are many, the intervals between the horizontal lines are increased. Alternate placement to avoid narrowing.

In addition, the data electrodes 3, 4, and 5 are disposed to be perpendicular to the sustain electrode 2 and the scan electrode 7 perpendicularly to each unit cell, and within the cell to which the data electrodes 3, 4, and 5 belong. The formed RGB phosphor (not shown) is formed, and a discharge phenomenon occurs together with the sustain electrode 2 and the scan electrode 7 only when a voltage is applied to the data electrodes 3, 4, and 5.

At this time, the shift register and the buffer 6 applying the voltage to the data electrodes 3, 4, and 5 apply the same size voltage to each of the data electrodes 3, 4 and 5 of the RGB phosphor. Let light come from.

However, when the same size voltage is applied to each data electrode of the RGB phosphors as described above, the chemical and physical characteristics of each of the RGB phosphors are not taken into consideration, thus making it difficult to achieve white valance. do.

Accordingly, the present invention has been invented to solve the above problems, and an object of the present invention is to provide a PDP which has a plurality of shift registers and a buffer so that a voltage is applied to each of the RGB phosphors so that white balance can be achieved. The present invention provides a voltage variable device for controlling white balance.

The technical idea of the present invention for achieving the object of the present invention as described above is formed so that the sustain electrode, the scan electrode and the data electrode vertically intersect, and includes a shift register and a buffer for applying a different voltage to the data electrode, respectively. A voltage variable device for white balance control of a PDP is provided, and a plurality of shift registers and buffers for applying a voltage to each of the RGB phosphors formed in the data electrode are provided. By allowing different voltages to be applied to each of the phosphor, the G phosphor, and the B phosphor, the luminous efficiency of each of the RGB phosphors can be considered, thereby making it possible to effectively balance the white balance.

1 is a view showing a state in which a voltage is applied to a conventional data electrode.

2 is a view illustrating a voltage variable device for white balance control of a PDP according to an exemplary embodiment of the present invention.

3 is a circuit diagram illustrating a shift register and a buffer according to an embodiment of the present invention.

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

1, 10: PDP panel 2, 20: sustain electrode

3, 4, 5, 30, 40, 50: data electrode 6: shift register and buffer

7, 90: scan electrode 60: first shift register and buffer

60a, 60b: transistor 60c: inverter

70: second shift register and buffer 80: third shift register and buffer

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

First, to explain the characteristics of the phosphor in order to aid the understanding of the present invention, the light emitting principle of the phosphor is a high voltage is applied to the discharge gas encapsulated in the PDP electrode to form a plasma state, the ultraviolet light generated in the plasma state is Energy is given to the phosphor. At this time, the electrons in the phosphor change from the ground state (stable state) to the excited state (excited state), and then return to the ground state again, the energy difference between the excited state and the ground state is emitted by light. .

In addition, the emission efficiency of the phosphor varies depending on the type, pressure, and driving voltage of the discharge gas, and the visible light of red (R), green (G), and blue (B) depends on its composition. Light emission. That is, the composition of the material is changed to emit the visible light of red (R), green (G), and blue (B), and thus the values of purity and luminance of the visible light emitted are changed. In addition, since the composition of the phosphor is different, the time point at which the visible light of red (R), green (G), and blue (B) is generated is also different, which is the red (R) and green (G). This affects the white valance, which consists of a proper combination of visible light of blue (B).

2 is a diagram illustrating a voltage variable device for white balance control according to an exemplary embodiment of the present invention, wherein the sustain electrode 20 and the scan electrode are arranged on the PDP panel 10 in a horizontally staggered state. A cell to which the data electrodes 30, 40, and 50 are arranged so as to be perpendicular to the sustain electrode 20 and the scan electrode 90; RGB phosphors (not shown) formed therein, and three shift registers and buffers 60, 70, 80 for applying a voltage to the data electrodes 30, 40, 50.

Hereinafter, with reference to the accompanying Figure 2 will be described the operation according to an embodiment of the present invention.

First, in the PDP panel 10, the sustain electrode 20 and the scan electrode 90 are arranged to be staggered with each other in the horizontal direction, and are perpendicular to the sustain electrode 20 and the scan electrode 90. The data electrodes 30, 40, and 50 are arranged.

The data electrodes 30, 40, and 50 are arranged perpendicularly to the sustain electrode 20 and the scan electrode 90 at every unit cell, and within the cells to which the data electrodes 30, 40, and 50 belong. The formed RGB phosphors (not shown) are formed respectively, and a discharge phenomenon occurs together with the sustain electrode 20 and the scan electrode 90 only when voltage is applied to the data electrodes 30, 40, and 50. Ultraviolet rays generated by the phenomenon excite the RGB phosphors so that the visible light of each RGB is emitted.

Here, a plurality of shift registers and buffers 60, 70, and 80 for applying voltages to the data electrodes 30, 40, and 50 of each of the RGB phosphors are provided, thereby achieving the greatest feature of the present invention.

That is, by including the plurality of shift registers and buffers 60, 70, and 80, the first shift register and the buffer 60 among the plurality of shift registers and buffers 60, 70, and 80 are R phosphors (not shown). Voltage is applied only to the data electrode 30 of the second electrode, and the second shift register and the buffer 70 apply voltage only to the data electrode 40 of the G phosphor (not shown). 80 applies a voltage only to the data electrode 50 of the B phosphor (not shown).

For example, data electrodes 30 arranged on the PDP panel 10 to apply voltages to R phosphors are collected in a predetermined number to apply voltages to the same phosphors, and similarly, data electrodes to apply voltages to G phosphors. The same method is used for the 40 and the data electrode 50 for applying the voltage to the B phosphor.

Here, the number of data electrodes arranged on the PDP panel is 2559 when the type is 16: 9, so the number of shift registers and buffers applying voltage to the data electrodes is adjusted in consideration of the data writing time and the like. Can be.

Accordingly, by the above method, the luminous efficiency of each of the RGB phosphors is taken into consideration so that different voltages are applied to emit light, so that the luminous efficiency of each of the phosphors can be considered. The white balance by the combination is made easy.

In addition, by varying the voltage applied to each of the phosphors of the RGB, the amount of generated wall charges in the cell can be adjusted, and a plurality of shift registers and buffers are provided so that the voltage is applied to only one phosphor. Input time can be reduced.

3 is a circuit diagram showing a shift register and a buffer 60, 70, and 80 according to an embodiment of the present invention, wherein each of the shift registers 60, 70, and 80 is composed of two transistors 60a, 60b) and inverter 60c.

Looking at the operation, when the data pulse is input, the side with and without the inverter 60c is opposite to each other, the transistor 60a is turned on when the high pulse is applied to the side without the inverter 60c, The transistor 60b on the side with the inverter 60c is turned off so that the voltage (+ V) applied to the circuit is output to the data electrode.

On the other hand, when a low pulse is applied to the side without the inverter 60c, the transistor 60a is turned off, while the transistor 60b on the side with the inverter 60c is turned on so that the voltage applied to the circuit is grounded. Grounded.

By allowing the above simple circuit to be configured in the shift register and the buffer, respectively, it is possible to effectively control the light emission of each of the RGB phosphors.

As described above, in the present invention, the sustain electrode, the scan electrode and the data electrode are vertically intersected, and the voltage variable for white balance control of the PDP including a shift register and a buffer applying different voltages to the data electrodes, respectively. And a plurality of said shift registers and buffers for applying a voltage to each of the RGB phosphors formed in said data electrode, and each of said R phosphor, G phosphor and B phosphor is provided by said plurality of shift registers and buffers. By allowing different voltages to be applied to each other, the luminous efficiency of each of the RGB phosphors can be taken into account, and thus, the white balance can be effectively adjusted.

Claims (2)

In the PDP panel formed such that the sustain electrode, the scan electrode and the data electrode cross vertically, And a voltage application means for allowing voltage application by the data electrode to be performed independently. 2. The voltage variable device for controlling white balance of a PDP as set forth in claim 1, wherein said voltage application means comprises two transistors (60a, 60b) and one inverter (60c).