KR100588014B1 - Plasma Display Panel And Method Of Removing Afterimage in the same - Google Patents

Abstract

The present invention relates to a plasma display panel capable of removing an afterimage and a method of removing the afterimage.

The plasma display panel according to the present invention includes a panel on which an image is displayed, and at least two heat dissipation sheets for dissipating heat generated from the panel, wherein at least one of the at least two heat dissipation sheets has a horizontal direction and a vertical direction. Heat transfer rate in at least one of the direction is characterized in that 100 ~ 200kcal / m 2 h ℃.

Description

Plasma Display Panel And Method Of Removing Afterimage in the same}             

1 is a cross-sectional view showing a conventional plasma display panel.

2 is a perspective view illustrating a plasma display panel according to a first embodiment of the present invention.

3 is a perspective view illustrating a plasma display panel according to a second embodiment of the present invention.

4 is a view comparing the afterimage duration of the heat dissipation sheet shown in FIGS. 2 and 3 and the conventional heat dissipation sheet.

<Description of Symbols for Main Parts of Drawings>

10,18 substrate 12A scanning electrode

12B: sustain electrode 14,22: dielectric layer

16: protective film 20: data electrode

24: partition 26: phosphor layer

40, 50, 60: panel 42: top plate

44: lower plate 52, 54, 56, 62, 64, 66: heat dissipation sheet

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of removing an afterimage and a method of removing the afterimage.

Plasma Display Panel (hereinafter referred to as "PDP") is an image containing characters or graphics by emitting phosphors by 147 nm ultraviolet rays generated during discharge of He + Xe, Ne + Xe or He + Ne + Xe gas. Will be displayed. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP lowers the voltage required for discharge by using wall charges accumulated on the surface during discharge, and has advantages of low voltage driving and long life because it protects the electrodes from sputtering caused by the discharge.

1 is a view schematically showing a conventional plasma display panel.

Referring to FIG. 1, a conventional PDP includes a panel 40 in which discharge cells are arranged in a matrix, and a heat dissipation sheet 30 for dissipating heat generated from the panel 40.

The panel 40 includes a top plate 42 having sustain electrode pairs 12A and 12B, an upper dielectric layer 14, and a protective layer 16 sequentially formed on the upper substrate 10, and the lower substrate 18. And a lower plate 44 having a data electrode 20, a lower dielectric layer 22, a partition wall 24, and a phosphor layer 26.

Each of the sustain electrode pairs 12A and 12B of the upper plate 42 is composed of a scan electrode and a sustain electrode. The scan signal for scanning the panel and the sustain signal for maintaining the discharge are mainly supplied to the scan electrode 12A, and the sustain signal is mainly supplied to the sustain electrode 12B. Charges are accumulated in the upper dielectric layer 14 and the lower dielectric layer 22. The protective layer 16 prevents damage to the upper dielectric layer 14 by sputtering, thereby increasing the lifetime of the PDP and increasing the emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used.

The lower data electrode 22 is formed to intersect with the sustain electrode pairs 12A and 12B. The data electrode 22 is supplied with a data signal for selecting cells to be displayed. The partition wall 24 is formed in parallel with the data electrode 22 to prevent ultraviolet rays generated by the discharge from leaking into adjacent cells. The phosphor layer 26 is applied to the surfaces of the lower dielectric layer 22 and the partition wall 24 to generate visible light of any one of red, green, and blue. Then, an inert gas for gas discharge is injected into the discharge space therein.

The PDP cell is selected by the counter discharge between the data electrode 20 and the scan electrode 12A, and then sustains the discharge by the surface discharge between the sustain electrode pairs 12A and 12B. In the PDP cell, the fluorescent material 26 emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted outside the cell. As a result, the PDP having cells displays an image. In this case, the PDP implements a gray scale required for displaying an image by adjusting the discharge sustain period of the cell, that is, the number of sustain discharges, according to the video data.

The heat dissipation sheet 30 is disposed on the rear surface of the panel 40 to discharge heat generated when the panel 40 is driven to the outside. That is, the heat dissipation sheet 30 releases heat of the panel 40 to the outside to prevent the temperature of the panel 40 from rising sharply.

The plasma display panel has a problem in that a bright afterimage or a dark afterimage occurs. That is, when the full white image is turned on for a certain period of time and then switched to another image, the full white image does not disappear, and the afterimage appears when the full white image overlaps with the current image. Alternatively, when a full black image is turned on for a certain period of time and then switched to another image, a full black image does not disappear and a dark image appears when the full black image overlaps with the current image.

Accordingly, an object of the present invention is to provide a plasma display panel capable of removing an afterimage and a method of removing the afterimage.

In order to achieve the above object, a plasma display panel according to the present invention includes a panel on which an image is displayed and at least two heat dissipation sheets for dissipating heat generated from the panel, and at least one of the at least two heat dissipation sheets. One is characterized in that the heat transfer rate in at least one of the horizontal direction and the vertical direction is 100 ~ 200kcal / ㎡ h ℃.

The at least two heat dissipation sheet is connected to the panel and the first heat dissipation sheet formed of aluminum; And a second heat dissipation sheet connected to the first heat dissipation sheet and formed of graphite material.

The at least two heat dissipation sheet is connected to the first surface of the panel and the first heat dissipation sheet formed of graphite material; And a second heat dissipation sheet connected to the second surface of the panel and formed of a graphite material of the same material or a different material as the first heat dissipation sheet.

The graphite is characterized in that it comprises a silicon or acrylic material.

In order to achieve the above object, the afterimage removal method of the plasma display panel according to the present invention comprises the steps of: displaying an image using the panel; The heat generated from the panel is discharged from the panel using at least two heat dissipation sheets having a heat transfer rate of 100 to 200 kcal / m 2 h ° C. in at least one of a horizontal direction and a vertical direction during the image display. Characterized in that it comprises a step.

Dissipating heat generated from the panel by using the at least two heat dissipation sheets may include: a first heat dissipation sheet connected to the panel and made of aluminum, and a second heat dissipation made of graphite material and connected to the first heat dissipation sheet; And dissipating heat generated from the panel using a sheet.

The dissipating heat generated from the panel by using the at least two heat dissipation sheets may include: a first heat dissipation sheet connected to the first surface of the panel and formed of graphite material; And dissipating heat generated from the panel using a second heat dissipation sheet formed of a graphite material of the same material or a different material as the heat dissipation sheet.

The afterimage removing method of the plasma display panel may further include gradually darkening the luminance of the image.

The afterimage removal method of the plasma display panel may further include moving the still image up, down, left, and right after a predetermined time.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 2 to 4.

2 is a diagram illustrating a plasma display panel according to a first embodiment of the present invention.

2, the PDP according to the first embodiment of the present invention includes a panel 50 in which discharge cells are arranged in a matrix form, and at least two heat dissipation sheets 56 for dissipating heat generated from the panel 50. ).

The panel 50 has the same components as the conventional panel shown in FIG. That is, the panel 50 is provided with a plurality of discharge cells as shown in FIG. The discharge cell emits visible light corresponding to data supplied from the outside to the front surface of the panel 50. At this time, the panel 50 is combined with the visible light generated from the plurality of discharge cells to display a predetermined image.

The heat dissipation sheet 56 includes first and second heat dissipation sheets 52 and 54 to dissipate heat generated when the panel 50 is driven to the outside.

The first heat dissipation sheet 52 is formed of a material having a high heat transfer rate, for example, aluminum (Al), in order to discharge heat generated when the panel is driven to the second heat dissipation sheet 54. When the thickness of the first heat dissipation sheet 52 formed of the aluminum (Al) is about 5 mm, the heat transfer rate of the first heat dissipation sheet 52 in at least one of the horizontal direction and the vertical direction is 100 to 200 kcal. / M 2 h ° C, preferably 150 to 200 kcal / m 2 h ° C.

The second heat dissipation sheet 54 is formed of silicon, acryl, carbon, or graphite to dissipate heat emitted from the first heat dissipation sheet 52 to the outside. When the thickness of the second heat dissipation sheet 54 is about 5 mm, the second heat dissipation sheet 54 has a heat transfer rate in a horizontal direction of 100 to 200 kcal / m 2 h ° C, preferably 150 to 200 kcal / m 2 h ° C. The heat transfer rate in the vertical direction is less than 20 kcal / m 2 h ° C.

As such, the PDP according to the first embodiment of the present invention includes a heat dissipation sheet made of aluminum having a high heat transfer rate in order to reduce a persistence afterimage. Accordingly, the PDP according to the first embodiment of the present invention can reduce the light / dark persistence duration from several tens of minutes to several minutes as shown in FIG. 4.

3 is a perspective view illustrating a PDP according to a second embodiment of the present invention.

Referring to FIG. 3, the PDP according to the second embodiment of the present invention includes the same components except that the heat dissipation sheet includes first and second heat dissipation sheets formed of graphite, as compared to the PDP shown in FIG. 2. Equipped. Accordingly, detailed description of the same components will be omitted.

The heat dissipation sheet 66 includes first and second heat dissipation sheets 62 and 64 to dissipate heat generated when the panel 60 is driven to the outside.

The first heat dissipation sheet 62 is a material capable of transferring heat to release heat generated from the front or rear surface of the panel to the outside when the panel 60 is driven, for example, silicon, acryl, and carbon ( carbon or graphite. When the thickness of the first heat dissipation sheet 62 is about 5 mm, the first heat dissipation sheet 62 has a heat transfer rate in a horizontal direction of 100 to 200 kcal / m 2 h ° C., preferably 150 to 200 kcal / m 2 h ° C., The heat transfer rate in the vertical direction is less than 20 kcal / m 2 h ° C.

The second heat dissipation sheet 64 may be formed of the same material as that of the first heat dissipation sheet 62 to release heat generated from the back or front of the panel 60 to the outside so as to face the first heat dissipation sheet 62. 1 is formed of a material different from the heat radiation sheet (52). When the thickness of the second heat dissipation sheet 64 is about 5 mm, the second heat dissipation sheet 64 has a heat transfer rate in a horizontal direction of 150 to 200 kcal / m 2 h ° C., and a heat transfer rate in a vertical direction of 20 kcal / m 2. less than h ° C.

As such, the PDP according to the second embodiment of the present invention is formed of silicon, acrylic, carbon, or graphite to reduce afterimage persistence, and is attached to the front and back of the panel. A heat radiation sheet is provided. Accordingly, as shown in FIG. 4, the PDP according to the second embodiment of the present invention can reduce the persistence of bright afterimages from several tens of minutes to several minutes.

FIG. 4 is a diagram illustrating the residual persistence time according to materials of the first and second heat dissipation sheets illustrated in FIGS. 2 and 3.

As shown in FIG. 4, in the first heat dissipation sheet formed of the aluminum material of the plasma display panel according to the first embodiment of the present invention, the time for which the afterimage persists without applying the afterimage minimization method is 1 minute to 10 minutes or more. With 30 seconds, the duration of afterimages can be reduced from more than 10 minutes to 8 minutes. On the other hand, image sticking minimization methods include progressively darkening the brightness of an image as a whole and moving the still image up, down, left, and right after a predetermined time so that the effect on the cell is not concentrated.

In addition, the heat dissipation sheet formed of silicon, acrylic, carbon, or graphite of the plasma display panel according to the first and second embodiments of the present invention may not apply the afterimage minimization method. If the afterimage duration is no different from the conventional. On the other hand, the heat dissipation sheet formed of silicon, acrylic, carbon, or graphite can reduce the duration of image persistence from more than 10 minutes to 1 minute when the afterimage minimization method is applied. have.

As described above, the plasma display panel and the afterimage removing method according to the present invention include a heat dissipation sheet made of aluminum having a high heat transfer rate; And at least one of a heat dissipation sheet formed of silicon, acryl, carbon, or graphite. Accordingly, the PDP according to the present invention can reduce the light / dark persistence duration from several tens of minutes to several minutes.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (10)

The panel which an image is displayed on, A first heat dissipation sheet connected to the panel to dissipate heat generated from the panel and formed of aluminum, and having a heat transfer rate of 100 to 200 kcal / m 2 h ° C .; The second heat dissipation sheet is connected to the first heat dissipation sheet and is formed of acrylic, carbon or graphite, and includes a second heat dissipation sheet having a heat transfer rate in a horizontal direction of 100 to 200 kcal / m 2 h ° C. and a heat transfer rate of less than 20 kcal / m 2 h ° C. in a vertical direction. Plasma display panel, characterized in that. delete The panel which an image is displayed on, A first heat dissipation sheet connected to the first surface of the panel to dissipate heat generated in the panel and formed of silicon, acrylic, carbon or graphite material; And a second heat dissipation sheet connected to the second surface of the panel and formed of silicon, acrylic, carbon, or graphite material. The method of claim 3, wherein The first heat dissipation sheet has a heat transfer rate in a horizontal direction of 100 to 200 kcal / m 2 h ° C., and a heat transfer rate in a vertical direction of less than 20 kcal / m 2 h ° C. Displaying an image using the panel; When the image is displayed, the heat generated from the panel is connected to the panel, the first heat dissipation sheet is formed of aluminum, and has a heat transfer rate of 100 to 200 kcal / m 2 h ° C., and the first heat dissipation sheet is acryl, carbon, or graphite. Forming a material and dissipating heat generated from the panel using a second heat dissipation sheet having a heat transfer rate in a horizontal direction of 100 to 200 kcal / m 2 h ° C. and a vertical heat transfer rate of less than 20 kcal / m 2 h ° C. An afterimage removal method of a plasma display panel. delete Displaying an image using the panel; A first heat dissipation sheet connected to the first surface of the panel and formed of silicon, acrylic, carbon, or graphite material, and a second heat dissipation sheet connected to the second surface of the panel and formed of silicon, acrylic, carbon, or graphite material And dissipating heat generated from the panel when displaying the image. The method of claim 7, wherein And gradually reducing the brightness of the image. The method of claim 7, wherein And moving the still image up, down, left, and right after a predetermined time has passed. The method according to claim 3 or 4, The second heat dissipation sheet has a heat transfer rate in a horizontal direction of 100 to 200 kcal / m 2 h ° C., and a heat transfer rate in a vertical direction of less than 20 kcal / m 2 h ° C.

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