KR20060132362A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to stabilize operations of a printed circuit board and maintain driving stability thereof by blocking effectively heat generated from a discharge space. A plasma display panel includes a display panel having an upper substrate(70) and a lower substrate(72). A plurality of pairs of scan and sustain electrodes are disposed on the upper substrate. A plurality of address electrodes are disposed perpendicularly to the scan and sustain electrodes on the lower substrate. A plurality of barrier ribs are formed on the lower substrate in order to define a discharge space. A refrigerant layer(74) for storing a refrigerant is formed on the upper substrate of the display panel.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a cross-sectional view of a three-electrode surface discharge plasma display panel.

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

3 is a schematic view of a plasma display panel according to a first embodiment of the present invention.

4 is a cross-sectional view of the display panel illustrated in FIG. 3 taken along a line A-A '.

5 is a cross-sectional view of a display panel according to a second exemplary embodiment of the present invention.

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

70: upper substrate 72: lower substrate

36: heat sink 32, 52: cabinet

49, 69: back cover 40, 60: printed circuit board

74: coolant layer 79: transparent dummy substrate

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of preventing the panel from rising to a high temperature by heat generated during discharge.

Recently, various flat panel displays have been developed to reduce weight and volume, which are disadvantages of cathode ray tubes. Such flat panel displays include liquid crystal displays, field emission displays, electro luminescence, and plasma display panels (PDPs). .

Referring to FIG. 1, a discharge cell of a three-electrode AC surface discharge type PDP includes a scan electrode 8Y and a sustain electrode 8Z formed on the upper substrate 10, and an address electrode formed on the lower substrate 12. 2) is provided.

Each of the scan electrode 8Y and the sustain electrode 8Z has a line width smaller than that of the transparent electrodes 4Y and 4Z and the transparent electrodes 4Y and 4Z, and is formed on one edge of the transparent electrodes 4Y and 4Z. Bus electrodes 6Y and 6Z. The transparent electrodes 4Y and 4Z are usually formed on the upper substrate 10 using indium tin oxide (ITO) as a material. The metal bus electrodes 6Y and 6Z are formed of a metal such as chromium (Cr) on the transparent electrodes 4Y and 4Z, thereby reducing the voltage drop caused by the transparent electrodes 4Y and 4Z having high resistance. The upper dielectric layer 14 and the passivation layer 18 are stacked on the upper substrate 10 on which the scan electrode 4Y and the sustain electrode 4Z are formed. The upper dielectric layer 14 accumulates wall charges generated during plasma discharge. The protective film 18 protects the upper dielectric layer 14 from sputtering generated during plasma discharge and increases the emission efficiency of secondary electrons. As the protective film 18, magnesium oxide (MgO) is usually used.

The address electrode 2 is formed on the lower substrate 12 in a direction crossing the scan electrode 8Y and the sustain electrode 8Z. The lower dielectric layer 16 and the partition wall 20 are formed on the lower substrate 12 on which the address electrode 2 is formed. The phosphor layer 22 is formed on the surfaces of the lower dielectric layer 16 and the partition wall 20. The partition wall 20 is formed parallel to the address electrode 2 to structurally distinguish the discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 22 is excited and emitted by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. An inert mixed gas such as He + Xe, Ne + Xe or He + Ne + Xe for discharging is injected into the discharge space of the discharge cells provided between the upper and lower substrates 10 and 12 and the partition wall 20.

A PDP including such a display panel will be described with reference to the drawings.

2 is a perspective view schematically showing the inside of a general PDP.

Referring to FIG. 2, a general PDP includes a display panel 34, a heat sink 36, a back cover 49, a cabinet 32, and a printed circuit board (PCB) 40. .

The display panel 34 includes an upper substrate and a lower substrate, not shown, and phosphors are coated on the lower substrate. The upper substrate transmits light generated from the phosphor to display a predetermined image.

The display panel 34 includes a plurality of driving integrated circuits (hereinafter referred to as "driver ICs") connected to scan electrodes and address electrodes (not shown) to supply data signals and scan signals, respectively. Is formed. The driver ICs include a scan driver IC and a data driver IC, each of which is installed between the printed circuit board 40 and the display panel 34 to display a display panel 34 in response to a control signal supplied from the printed circuit board 40. Supply a driving signal. The double-sided adhesive tape 30 is attached to a surface of the display panel 34 facing the heat sink 36. The display panel 34 and the heat sink 36 are bonded to each other by the double-sided adhesive tape 30.

The heat dissipation plate 36 is bonded to the display panel 34 by the double-sided adhesive tape 30 to support the display panel 34 and to dissipate heat generated when the display panel 34 is driven. As the material of the heat sink 36, a metallic material having high thermal conductivity, for example, aluminum is used to efficiently dissipate heat generated from the display panel 34. The heat sink 36 is formed with a projection 38 on which the printed circuit board 40 is stacked. The screw 44 penetrates the hole 42 formed in the printed circuit board 40, and the printed circuit board 40 is fastened to the heat sink 36.

In addition, guards 25 protruding from the heat sink 36 are formed at four corners of the heat sink 36. A hole 15 is formed in the guard 25, and a screw 35 penetrates the hole 15 to fix the heat sink 36 to the back cover 49.

The printed circuit board 40 supplies a predetermined driving signal to the electrodes of the display panel 34. To this end, the printed circuit board 40 includes various driving units, and the printed circuit board 40 and the display panel 34 are connected by an FPC (Flexible Printed Circuit) (not shown). The printed circuit board 40 has a hole 42 formed therein and fastened to the heat sink 36 by a screw 44.

The cabinet 32 is installed on the front of the display panel 34 to protect the display panel 12 from external shocks and is composed of a glass and a front filter. The front filter is composed of an optical characteristic film, an electromagnetic shield (EMI) shielding film, and an ultraviolet shielding film. The glass protects the front filter from damage from external impact. The optical characteristic film improves the optical characteristics of the PDP by lowering the luminance of red (R) and green (G) and increasing the luminance of blue (B) among the light incident from the display panel 34. The electromagnetic shielding film shields electromagnetic waves and prevents electromagnetic waves incident from the display panel 34 from being emitted to the outside. The infrared shielding film shields the infrared rays emitted from the display panel 34 to prevent the infrared rays above the reference from being emitted to the outside so that signals transmitted using the infrared rays such as a remote controller can be normally transmitted.

When the PDP is shipped, the back cover 49 is installed to surround the PDP. The back cover 49 is coupled to the cabinet 32 to protect the plasma display panel from external shocks and to block electromagnetic waves emitted to the rear surface.

When the PDP is driven, a large amount of heat is generated in the display panel 34 and the printed circuit board 40. The heat radiating plate 36 radiates heat generated inside the PDP, but the heat dissipation efficiency is low, resulting in a high temperature inside the PDP. When the inside of the PDP is in a high temperature state, the driving characteristics are deteriorated and the driving elements are damaged. In addition, when the temperature of the panel rises, the discharge becomes unstable, so that an erroneous discharge occurs, whereby a bright point may occur. Therefore, the heat dissipation problem with respect to the high temperature generated during discharge in the PDP is very important. In order to solve the heat dissipation problem, a blower (FAN) may be installed in the PDP, but there is a problem that noise is generated when the blower is driven.

Accordingly, it is an object of the present invention to provide a PDP that can effectively dissipate heat generated in the PDP.

According to an object of the present invention, an upper substrate having a plurality of pairs of parallel scan electrodes and sustain electrodes disposed thereon, and a lower portion having a plurality of address electrodes arranged in a direction orthogonal to the scan electrodes and the sustain electrodes and partitioned to separate discharge spaces A plasma display panel including a display panel on which a substrate is bonded is provided, the plasma display panel including a refrigerant layer on which a refrigerant is stored on an upper substrate of the display panel.

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

Hereinafter, the PDP according to the present invention will be described in detail with reference to FIGS. 3 to 5.

3 is a diagram schematically illustrating an inside of a PDP according to an exemplary embodiment of the present invention, and FIG. 4 is a diagram illustrating a cross section taken along line AA ′ of the display panel.

3 and 4, the PDP according to the present invention includes a coolant layer 53 formed between the display panel 54, the display panel 54, and the transparent dummy substrate, the back cover 69, and the cabinet 52. ) And a printed circuit board (PCB) 60.

The display panel includes an upper substrate 70 and a lower substrate 72, and phosphors are coated on the lower substrate 72. The upper substrate 70 transmits visible light generated from the phosphor to display a predetermined image.

The display panel forms the coolant layer 74 on the upper substrate 70 which is the display surface of the display panel. The coolant layer 74 is formed between the upper substrate 70 and the transparent dummy substrate 79 formed at predetermined intervals from the upper substrate 70.

When plasma discharge occurs in the discharge space 76 formed inside the display panel, considerable heat and noise are generated. This heat and noise not only disturb the viewer, but also heat generated from the display panel is transferred to the printed circuit board 60 immediately adjacent to the display panel, which affects heat-sensitive semiconductor devices, thereby driving the entire plasma display panel. Can affect. In addition, abnormal discharge occurs in a place where the temperature of the panel is high, resulting in bright spots. As such, when the panel becomes high temperature, in order to solve the problem, the refrigerant is circulated in the refrigerant layer to maintain the panel temperature at an appropriate temperature.

5 shows an apparatus for circulating a refrigerant gas in a refrigerant layer.

Referring to FIG. 5, the refrigerant circulation device includes a refrigerant circulation layer 74, a compressor 90, a condenser 100, and an expansion valve 110. The refrigerant circulation layer 74 prevents the panel from rising to a high temperature by using latent heat absorbed when the refrigerant evaporates. The cooled air convections the refrigerant circulation layer 74 formed on the upper substrate of the panel. The vaporized refrigerant gas is mechanically driven by the compressor 90 to produce a gas of high temperature and high pressure, and is pressurized by the condenser 100. When the condensed refrigerant is sent from the expansion valve 110 to the evaporator, the refrigerant is evaporated again and the cooling operation is repeated. By adjusting the expansion valve 110 it is possible to adjust the strength of the cooling. As such, when the refrigerant circulation layer 74 is formed on the upper substrate of the display panel, the display panel may be prevented from rising to a high temperature.

On the other hand, as the refrigerant usable in accordance with the technical idea of the present invention, ethyl ether, ammonia, carbon dioxide, sulfurous acid gas, methyl chloride, CFC-based refrigerants may be used. In addition, HCFC-123, R-502, HFC-125, HFC-134a, or the like may be used as the hydrochlorofluorocarbon (HCFC) -based material or the hydrofluorocarbon (HFC) -based material to reduce ozone destruction. Since such refrigerants are well known to those skilled in the art, detailed descriptions thereof will be omitted.

In addition, the back cover 69 may form a guard (not shown) protruding from the corner portion of the substrate 56 to fix the back cover 69 through a screw (not shown).

The printed circuit board 60 supplies a predetermined driving signal to the electrodes of the display panel. To this end, the printed circuit board 60 includes various driving units, and the printed circuit board 60 and the display panel are connected by an FPC (Flexible Printed Circuit) (not shown). Holes 62 are formed in the printed circuit board 60 and fastened to the substrate 56 by screws 64.

The cabinet 52 is installed in front of the display panel to protect the panel from external shocks and is composed of a glass and a front filter. The front filter is composed of an optical characteristic film, an electromagnetic shield (EMI) shielding film, and an ultraviolet shielding film. The glass protects the front filter from damage from external impact. The optical characteristic film improves the optical characteristics of the PDP by lowering the luminance of red (R) and green (G) and increasing the luminance of blue (B) among the light incident from the panel. The electromagnetic shielding film shields electromagnetic waves and prevents electromagnetic waves incident from the panel from being emitted to the outside. The infrared shielding film shields infrared rays emitted from the panel to prevent the infrared rays above the reference from being emitted to the outside so that signals transmitted using the infrared rays such as a remote controller can be normally transmitted.

As described above, the PDP according to the embodiment of the present invention effectively blocks the heat generated in the discharge space, bringing the safety of the operation of the printed circuit board to maintain the stability of the overall PDP driving, the panel rises to a high temperature Therefore, bright spots can be prevented from occurring due to abnormal discharge.

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 (3)

A display panel comprising an upper substrate having a plurality of pairs of parallel scan electrodes and sustain electrodes disposed thereon, and a lower substrate having a plurality of address electrodes arranged in a direction orthogonal to the scan electrodes and sustain electrodes and having partition walls for separating discharge spaces. In the plasma display panel comprising: And a refrigerant layer in which refrigerant is stored on an upper substrate of the display panel. The method of claim 1, A compressor for producing a gas of high temperature and high pressure; A condenser for cooling the high temperature and high pressure refrigerant to a liquid state; And an expansion valve configured to control an amount of the condensed refrigerant to be discharged into the refrigerant layer. The method of claim 1, The refrigerant injected into the refrigerant layer may be ethyl ether, ammonia, carbon dioxide, sulfurous acid gas, methyl chloride, CFC-based material, hydrochlorofluorocarbon (HCFC) -based material, HCFC-123, R-502, HFC-125, HFC- 134a ammonia, freon, chloromethyl any one of the plasma display panel.

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