KR19980053582A - PDP brightness control device - Google Patents

Abstract

The present invention relates to a brightness control apparatus of a PDP, wherein a sustain voltage, which is alternately provided from the outside by an adjustment control signal from a controller at the time of maintaining the PDP, is raised and adjusted by a predetermined level through the sustain voltage adjusting unit. Since the cells provided as the sustain circuit, the write and sustain circuits, and the addressed cells provided as the sustain electrodes and the write and sustain electrodes in each unit cell of the PDP are discharged, the gray scale processing can be increased by using the spare time during discharge, so that it is bright and dark. It is intended to be expressed in more detail.

Description

PDP brightness control device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cell structure of a plasma display panel (hereinafter, referred to as a PDP), and more particularly, to a brightness control apparatus of a PDDP capable of adjusting the luminance of an image signal displayed through a PDP display device. It is about.

Among the various display devices that are applied to various fields, cathode ray tubes (hereinafter abbreviated as CRTs), which are capable of clear display and colorization, simple driving, and low manufacturing cost, are used in many fields, However, since the CRT itself has a Frasco type structure, the CRT is large in size, requires a high operating voltage of approximately 10,000 V, and has a large disadvantage of display distortion.

Therefore, there is a strong demand for the emergence of a display device that can replace the CRT, and a study on a so-called flat display device having a large display area and a small volume has been continuously studied in various fields related thereto.

On the other hand, the flat display device as described above includes active devices such as electro luminescence, light emitting diodes, and PDPs, liquid crystal displays, and electro chromic displays. Display) and the like, and the present invention relates to PDP which is substantially one of the active devices.

For reference, the advantages of the PDP include a memory function that continues discharge when the input pulse is input once, and the display point is defined by the matrix structure, so that there is no distortion of the image and the emission frequency is 50-100 KHz. There is no flicker because it is high. In addition, the PDP has a planar structure, which is advantageous for the enlargement, and uses a material that reduces the extinguishing caused by the discharge on the surface of the dielectric layer in contact with the discharge. It is possible to superimpose on a slide, which is advantageous for simplicity.

On the other hand, the human eye is not visually aware of blinking at very short intervals, so when the maximum time at which such blinking cannot be felt is t, it is bright and dark depending on the amount of light visually felt by the human being. You will feel (Gray Scale).

In the case of the CRT described above, the bright and dark colors are expressed by controlling the amount of current hitting the fluorescent material, but the PDP must express the bright and dark colors by using ultraviolet rays generated during discharge. It is difficult. That is, in the case of PDP, light and dark are expressed according to the number of discharges during discharge.

Here, a large number and a small number of discharge times have the same meaning as a large number and a small number of sustain pulses.

Referring to FIG. 3, the luminance improves according to the increase in the sustain pulse frequency, but after a certain point, the luminance decreases rapidly. Therefore, the number of sustain pulses cannot be arbitrarily increased to increase the luminance. have.

Accordingly, the present invention has been made in view of the above-described problems, and by adjusting the sustain voltage at the time of holding the PDP, the luminance is compensated and the spare time is used for the gradation processing, whereby the bright and dark of the image data can be expressed in detail. It is an object of the present invention to provide a brightness control device of a PDP.

A brightness control apparatus of a PDP according to the present invention for achieving the above object comprises a data writing circuit for addressing grayscale processed rearranged image data, and an external device at the time of holding the PDP. Control means for generating an adjustment control signal for raising the sustain voltage provided by the predetermined level; sustain voltage adjustment means for raising and adjusting the level of the sustain voltage by a predetermined control signal from the control means; And writing the image data together with a sustain circuit in the plurality of cells constituting the PDP and a write circuit and a sustain circuit for providing the sustain voltage regulated by the sustain voltage adjusting means, and the data write circuit. Providing the sustaining voltage regulated by the sustaining voltage adjusting means to the sustaining electrode and the writing and sustaining electrode. It is characterized by consisting of a write and sustain circuit for.

1 is a schematic block diagram of a brightness control apparatus of a PDP according to an embodiment of the present invention;

FIG. 2 illustrates a cell structure of the PDP shown in FIG. 1;

3 is a diagram for explaining a relationship between frequency and luminance.

Explanation of symbols for main parts of the drawings

(102, 104): data writing circuit 106: holding and writing circuit

110: control unit 120: holding voltage generating unit

130: holding circuit 140: PDP

210: front glass plate 220: sustain electrode

230 write and sustain electrodes 240 address electrodes

250: dielectric layer 260: electron emitting layer

270: bulkhead 280: rear glass plate

The above and other objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention described below with reference to the accompanying drawings by those skilled in the art.

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

1 is a schematic block diagram of a brightness control apparatus of a PDP according to a preferred embodiment of the present invention, which includes data writing circuits 102 and 104, a holding and writing circuit 106, a controller 110, and a holding voltage adjusting unit. 120, a holding circuit 130, and a PDP 140.

In Fig. 1, the data writing circuits 102 and 104 and the holding and writing circuit 106 are addressed, i.e., cells to emit light and cells not to emit light, which are grayscaled rearranged image data provided from a memory interface, not shown. To choose.

In addition, the controller 110 generates a control signal for raising the sustain voltage supplied from the outside to a predetermined level when the PDP is held, and the sustain voltage adjuster 120 is externally controlled by an adjustment control signal from the controller 110. The level of the high voltages (180V to 300V) provided from the control unit is increased to a predetermined level and provided to the sustain circuit 130 and the sustain and write circuit 106.

In addition, the sustain circuit 130 and the sustain and write circuit 106 maintain the discharge of selected cells among the cells constituting the PDP 140 by the voltage adjusted to a predetermined level through the sustain voltage adjuster 120.

2 is a diagram for explaining the cell structure of the PDP, and the cell structure of the PDP will be described below for reference. In FIG. 2, A represents one unit cell.

As can be seen with reference to Figure 2, the cell structure of the PDP, the front glass plate that serves as a support for the PDP and transmits visible light emitted from the fluorescent material coated on the rear glass (Rear Glass, 280) (Front Glass Substrate, 210 to maintain the discharge of a desired cell among the cells of the PDP by providing each unit cell of the PDP with a positive voltage (for example, 180 V to 300 V), which is alternately provided from the outside, to each unit cell of the PDP. A sustain electrode 220 for writing data, a write and sustain electrode 230 for holding a discharge of a desired cell together with the sustain electrode 220 when writing data and holding a cell, and an address electrode for addressing data ( 240, the dielectric layer 250 that protects each electrode 220, 230, 240 at the time of discharge of the cell, and magnesium oxide (MgO), etc., are coated in a thin form to provide electrons by high voltage alternately provided from the outside. Emit, and as the emitted electrons accelerate, An electron emission layer 260 in which surface discharge is generated and each cell constituting the PDP is separated and partition walls 270 are provided to maintain a discharge space.

On the other hand, the rear glass plate 280 is coated with a thin fluorescent material to emit visible light by ultraviolet (Ultraviolet) generated during the discharge, the penning (Penning) so that the discharge is generated at a lower discharge start voltage in the discharge space The mixed gas is filled.

Hereinafter will be described in more detail with respect to the operation process of the brightness control device of the PDP according to the present invention made of the above-described constituent members.

First, the grayscaled rearranged image data provided from the memory interface, not shown, is selected by the data writing circuits 102 and 104 and the holding and writing circuit 106, that is, a cell to emit light and a cell not to emit light are selected. do.

Then, the control unit 110 generates a control signal for raising the sustain voltage supplied from the outside to a predetermined level during the holding of the PDP 140, and is maintained from the outside by the adjustment control signal from the control unit 110. The level of the voltage is adjusted to a predetermined level by the holding voltage adjusting unit 120 and is provided to the holding circuit 130 and the writing and holding circuit 106.

Then, the sustain voltage supplied from the sustain circuit 130 and the write and sustain circuit 106 is increased to the sustain electrode 220 and the write and sustain electrode 230 in each unit cell constituting the PDP 140. The penning mixed gas in the discharge space is discharged to generate ultraviolet rays, and visible light is generated from the fluorescent material by the generated ultraviolet rays and emitted to the front surface of the PDP 140 through the front glass plate 210.

At this time, since the ultraviolet rays discharged from the discharge space by the sustain voltage increased by a predetermined level are increased compared to the conventional ones, and the brighter visible light is emitted, the ultraviolet rays may have a time allowance under the same discharge condition. By increasing the processing, the light and dark of the image data can be expressed more in detail.

As described above, the sustain voltage, which is alternately provided from the outside by the control control signal from the controller 110 when the PDP is maintained, is adjusted by being raised by a predetermined level through the sustain voltage adjusting unit 120 and then the sustain circuit 130 and the write and sustain circuit 106 are provided to the sustain electrode 220 and the write and sustain electrode 230 in each unit cell of the PDP 140 to address the discharged cells.

Therefore, when the present invention is used, the gradation processing can be increased by using the spare time during discharge, and thus there is an effect of expressing light and dark in more detail.

Claims (1)

In a PDP display device, A data writing circuit for addressing the grayscale processed rearranged image data; Control means for generating an adjustment control signal for raising the sustain voltage supplied from the outside to a predetermined level when the PDP is held; Holding voltage adjusting means for raising and adjusting the level of the holding voltage by a predetermined level by an adjusting control signal from the control means; A sustain circuit for providing a sustain voltage regulated by the sustain voltage adjusting means to sustain electrodes in a plurality of cells constituting the PDP, and write and sustain electrodes; And a write and sustain circuit for writing the image data together with the data write circuit and for providing the sustain electrode and the write and sustain electrodes controlled by the sustain voltage adjusting means. PDP) luminance control device.