KR100863057B1 - Plasma Display Device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, comprising: an external light shielding sheet having a pattern portion having a refractive index smaller than that of the base portion, and formed on a base portion through which light is refracted at a predetermined angle and transmitted. It has a larger cross-sectional shape at the bottom of the lower end, characterized in that formed by containing a conductive material.

According to the present invention, the plasma display device can effectively implement a black image by attaching an external light shielding sheet that blocks light incident from the outside to the front of the panel, and can improve light-real contrast. In addition, by forming the pattern portion of the external light shielding sheet with a conductive material, electromagnetic waves generated from inside the panel can be reduced.

PDP, front filter, brightness, bright room contrast, exterior light shielding sheet, EMI

Description

Plasma Display Device

1 is a diagram illustrating an embodiment of a structure of a plasma display panel;

2 illustrates an embodiment of an electrode arrangement of a plasma display panel;

FIG. 3 illustrates an embodiment of a method in which one frame of an image is time-divided and driven into a plurality of subfields in a plasma display device.

4A to 4G illustrate various embodiments of the structure of the external light blocking sheet according to the present invention;

5 is a view showing the front surface of the external light blocking sheet according to the present invention;

6a to 6b are views showing various embodiments of the laminated structure of the external light blocking sheet according to the present invention,

7 illustrates an embodiment of a plasma display device according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device. In particular, in order to block external light incident from the outside of a panel, an external light shielding sheet made of two materials having different refractive indices is provided on the front of the panel, thereby providing a clear contrast and luminance of the panel. The present invention relates to a plasma display device that can improve electromagnetic radiation and shield electromagnetic waves generated inside a panel by imparting conductivity to at least one of the two materials.

In general, a plasma display panel (hereinafter referred to as a PDP) generates a discharge by applying a predetermined voltage to electrodes installed in a discharge space, and the plasma generated during gas discharge excites a phosphor, thereby causing an image including a character or graphic. As a device for displaying a display device, it is easy to increase in size, weight, and planar thickness, provide a wide viewing angle from side to side, and realize full color and high brightness.

When a black image is realized by such a PDP, external light is reflected from the front of the panel of the PDP due to the white phosphor exposed on the lower panel of the panel, whereby the black image is perceived as a dark color of a bright series and contrast. There is a problem that is lowered. In addition, there is a problem that electromagnetic waves are emitted from the panel to harm the human body.

The present invention has been made to solve the above-mentioned problems of the prior art, effectively blocking the external light incident on the panel, to improve the clear room contrast of the PDP, and to install an external light shielding sheet that can shield electromagnetic waves It is an object to provide a display device.

According to an aspect of the present invention, there is provided a plasma display apparatus including: a base portion through which light is refracted and transmitted at a predetermined angle; And an external light blocking sheet formed on the base part, the external light blocking sheet including a pattern part having a refractive index smaller than that of the base part, wherein the pattern part has a cross-sectional shape having a lower width than an upper end thereof, and the pattern part includes a conductive material. It is characterized by.

In this case, the pattern portion is formed of a metal material such as copper (Cu), aluminum (Al), titanium (Ti), lead (Pb).

The plasma display device according to the present invention for solving the above problems includes an external light blocking sheet having a base portion through which light is transmitted and a pattern portion formed on the base portion and having a refractive index smaller than that of the base portion. The portion has a cross-sectional shape having a lower width than an upper end, and a reflective layer is formed on at least one of left and right inclined surfaces of the pattern portion.

Alternatively, the pattern portion may be formed by coating an oxide such as copper oxide, copper dioxide, or iron oxide.

Such a conductive material is characterized by having a resistance of 0.001Ω to 2.5Ω.

The transparent conductive material is laminated on any one of the front and rear surfaces of the external light blocking sheet, and the transparent conductive material is characterized in that the indium tin oxide (Indium-Tin-Oxide).

In addition, the thickness of the external light shielding sheet is formed to about 20um to 250um, the refractive index of the pattern portion is preferably formed to be 0.3 times to 0.99 times the refractive index of the base portion, the pattern portion is characterized in that formed in a darker color than the base .

At this time, the lower end of the pattern portion is disposed to the panel side, the upper end is preferably disposed to the side where the external light is incident, the upper end width of the pattern portion is formed to 130um or less, the lower end width of the pattern portion is formed of 5um to 150um It is done.

In addition, the external light shielding sheet may include an AR layer for preventing reflection of external light; And at least one of an NIR shielding layer for shielding near infrared rays emitted from the panel, and an optical characteristic layer for improving color temperature and luminance of the panel, wherein the external light shielding sheet is installed on the front of the panel. It features.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a diagram illustrating an embodiment of a structure of a plasma display panel.

Referring to FIG. 1, the plasma display panel includes a scan electrode 11 and a sustain electrode 12, which are sustain electrode pairs formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. It includes.

Each of the sustain electrode pairs 11 and 12 is typically a transparent electrode 11a or 12a formed of indium tin oxide (ITO), a metal such as silver (Ag), chromium (Cr), or chromium / copper. And the bus electrodes 11b and 12b which may be formed in a stack of / chromium (Cr / Cu / Cr) or in a stack of chromium / aluminum / chromium (Cr / Al / Cr). At this time, the bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to reduce the voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

In addition, the PDP has a function of light blocking to reduce the reflection and absorption of external light generated from the outside of the upper substrate 10, and to improve the purity of the upper substrate 10 and the contrast of the PDP. Black Matrix (BM) is formed.

The black matrix is interposed between the first black matrix 15 formed at a position overlapping the partition wall 21 formed on the lower substrate 20, the transparent electrodes 11a and 12a and the bus electrodes 11b and 12b. It is composed of the second black matrices 11c and 12c formed. As such, the black matrix formed by separating the first and second black matrices 15, 11c and 12c is called a separate type BM, and since the second black matrices 11c and 12c form a layer between the electrodes, the black matrix is black. It may also be called a layer or a black electrode layer.

An upper dielectric layer 13 and a protective layer 14 are stacked on the upper substrate 10 on which the scan electrode 11 and the sustain electrode 12 are formed, respectively, and charged particles, which generate plasma, are accumulated on the upper dielectric layer 13. . The protective layer 14 protects the upper dielectric layer 13 from sputtering of charged particles generated during gas discharge, and increases emission efficiency of secondary electrons.

In addition, the address electrode 22 is formed on the lower substrate 20 in a direction crossing the scan electrode 11 and the sustain electrode 12, and the lower dielectric layer 24 is formed on the lower substrate 20 on which the address electrode 22 is formed. ) And a partition wall 21 are formed, and phosphors 23 which emit light by ultraviolet rays generated during gas discharge and generate visible light are coated on the lower dielectric layer 24 and the partition wall 21.

The partition wall 21 includes a vertical partition wall 21a formed in a direction parallel to the address electrode 22 and a horizontal partition wall 21b formed in a direction crossing the address electrode 22 to physically distinguish discharge cells. Ultraviolet rays and visible light generated by the discharge are prevented from leaking to the adjacent discharge cells.

Since the structure of the panel shown in FIG. 1 is only an embodiment of the structure of the plasma display panel according to the present invention, the present invention is not limited to the structure of the plasma display panel shown in FIG. 1. For example, the PDP according to the present invention may have a structure in which each of the sustain electrode pairs 11 and 12 omits the transparent electrodes 11a and 12a made of ITO and includes only the bus electrodes 11b and 12b. Since the structure does not use the transparent electrodes 11a and 12a, there is an advantage of lowering the unit cost of panel manufacturing, and the bus electrodes 11b and 12b may be various materials such as photosensitive materials in addition to the materials listed above.

In addition, the partition structure of the PDP shown in FIG. 1 represents a close type in which the discharge cells are closed by the vertical partition 21a and the horizontal partition 21b, but the present invention is not limited thereto. The exhaust passage is provided in at least one of the stripe type, which is the omitted structure, the differential partition structure having a different height between the vertical partition 21a and the horizontal partition 21b, the vertical partition 21a or the horizontal partition 21b. A channel type barrier rib structure in which a usable channel is formed, a groove type barrier rib structure in which a groove is formed in at least one of the vertical barrier rib 21a or the horizontal barrier rib 21b, and the like may be used.

Here, in the case of the differential barrier rib structure, the height of the horizontal barrier rib 21b is more preferable, and in the case of the channel barrier rib structure or the groove barrier rib structure, it is preferable that a channel is formed or the groove is formed in the barrier rib 21b. something to do.

On the other hand, in one embodiment of the invention is shown and described that each of the R, G and B discharge cells are arranged on the same line, it may also be arranged in other formation. For example, a delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible, and the shape of the discharge cell may be not only square but also various polygonal shapes such as pentagon and hexagon.

FIG. 2 illustrates an embodiment of an electrode arrangement of a plasma display panel, and a plurality of discharge cells constituting the plasma display panel are preferably arranged in a matrix form as shown in FIG. 2. The plurality of discharge cells are provided at the intersections of the scan electrodes Y1 to Ym, the sustain electrodes Z1 to Zm, and the address electrodes X1 to Xn, respectively. The scan electrodes Y1 to Ym may be driven sequentially or simultaneously, and the sustain electrodes Z1 to Zm may be driven simultaneously. The address electrodes X1 to Xn may be driven by being divided into odd-numbered and even-numbered electrodes or sequentially driven.

Since the electrode arrangement shown in FIG. 2 is only an embodiment of the electrode arrangement of the plasma display panel according to the present invention, the present invention is not limited to the electrode arrangement and driving method of the plasma display panel shown in FIG. 2. For example, a dual scan method in which two scan electrodes of the scan electrodes Y1 to Ym are simultaneously scanned is possible, and the address electrodes X1 to Xn are divided up and down at the center of the panel. It may be driven.

FIG. 3 is a diagram illustrating an embodiment of a time division driving method in which one frame of an image is divided into a plurality of subfields in a PDP.

Referring to FIG. 3, a unit frame may be time-division driven into a predetermined number, for example, eight subfields SF1,..., SF8 to express the gray level of an image. Each subfield SF1, ..., SF8 is divided into a reset section (not shown), an address section A1, ..., A8, and a sustain section S1, ..., S8. .

In each address section A1, ..., A8, a data signal is applied to the address electrode X, and corresponding scan pulses are sequentially applied to each scan electrode Y. FIG. Sustain pulses are alternately applied to the scan electrode Y and the sustain electrode Z in each of the sustain periods S1, ..., S8, so that the discharge cells selected in the address periods A1, ..., A8 are alternately applied. Cause sustain discharge.

The luminance of the plasma display panel is proportional to the number of sustain discharges in the sustain periods S1, ..., S8 occupied in the unit frame. When one frame forming one image is represented by eight subfields and 256 gray levels, each subfield in turn has different sustain pulses at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of can be assigned. Alternatively, in order to obtain luminance of 133 gray levels, cells may be sustained by addressing cells during subfield 1, subfield 3, and subfield 8 sections.

Meanwhile, the number of sustain discharges allocated to each subfield may be variably determined according to the weights of the subfields. That is, in FIG. 3, a case in which one frame is divided into eight subfields has been described as an example. However, the present invention is not limited thereto, and the number of subfields forming one frame may be variously modified according to design specifications. . For example, the plasma display panel may be driven by dividing one frame into eight or more subfields or the like, such as 12 or 16 subfields.

4A to 4G are views illustrating various embodiments of the structure of the external light blocking sheet according to the present invention.

4A to 4G, the external light blocking sheet 100 according to the present invention includes a base portion 110 having a predetermined refractive index and a pattern portion 120 formed on the base portion 110. do.

The base unit 110 is formed of a transparent plastic material having a predetermined refractive index in order to allow light to be transmitted smoothly and be refracted by a predetermined angle. At this time, the base portion 110 is preferably formed of a resin-based material formed by ultraviolet (UV) curing, but a rigid glass material may be used to increase the effect of protecting the entire surface of the panel. have.

In addition, the thickness of the base unit 110 may be substantially 20mm to 250um in consideration of the thickness (T) of the external light shielding sheet 100, considering the ease of manufacturing process and light transmittance. On the other hand, it is most preferable that the light emitted from the panel is smoothly transmitted, and the light incident from the outside is refracted to be effectively blocked by the pattern portion 120 toward the pattern portion 120. will be.

The pattern portion 120 formed on the base portion 110 has a cross-sectional shape having a larger width of the lower portion 120a than the upper portion 120b, and the width of the upper portion 120b is as shown in FIGS. 4A to 4D. It may have a pointed shape close to zero, and as shown in FIG. 4E, the upper end 120b may be formed to have a predetermined width in a range of 130 μm or less. In addition, the bottom width (P1) may be formed of 5um to 150um, it will be most preferably formed of 30um to 40um in order to ensure the aperture ratio to smoothly emit the light generated from the panel. In addition, in order to maximize the external light blocking effect of the external light blocking sheet 100, the upper end 120b of the pattern part 120 is disposed at the user side A from which light is incident from the outside, and the lower end 120a is the panel side ( Most preferably, B).

In addition, the pattern portion 120 preferably has a refractive index in a range of 0.3 to 0.99 times the base portion 110. That is, in general, external light that affects the contrast degradation of the PDP is often present in the upper head of the user. The external light is refracted to the inside of the pattern portion 120 to be blocked, and in order for the light emitted from the inside of the panel to display an image, total reflection occurs at the inclined surface 120c of the pattern portion 120. The refractive index of the 120 is lower than that of the base 110.

In addition, the pattern portion 120 is formed of a material darker than the base portion 110. That is, the external light blocking effect can be enhanced by forming a carbon-based material having good light absorption. In this case, the pattern unit 120 may be formed by adding a conductive material having a resistance of 0.001 Ω to 2.5Ω to shield the electromagnetic waves generated inside the panel at the same time as the external light blocking function. That is, as shown in Figure 4f may be formed by applying a powdery oxide (120c) such as copper oxide, copper dioxide, iron oxide, etc. to the pattern portion 120 made of a carbon-based material, shown in Figures 4a to 4e As shown, the pattern portion 120 is formed of a metal material such as copper (Cu), aluminum (Al), titanium (Ti), and lead (Pb) to block external light and at the same time, to achieve excellent shielding efficiency of electric wave. The blocking sheet 100 may be formed.

In addition, the conductive material and the grounding force of the external light shielding sheet 100 may be improved by stacking a transparent conductive material on either or both of the front and rear surfaces of the external light shielding sheet 100. For example, as illustrated in FIG. 4G, the transparent conductive material ITO may be stacked on the rear surface of the external light blocking sheet 100.

5 is a view schematically showing the front surface of the external light blocking sheet according to the present invention.

Referring to FIG. 5, in the external light shielding sheet 100 according to the present invention, the pattern portion 120 is formed in a stripe shape on the base portion 110 side by side at predetermined intervals. Not limited to this, another pattern portion may be further formed in a direction crossing the pattern portion 120 shown in FIG. 5 to increase the electromagnetic shielding efficiency, and may be generated by the black matrix and the black layer formed inside the panel. In order to prevent a phenomenon, the pattern part 120 may be formed to have an inclination by a predetermined angle with respect to the pattern part 120 illustrated in FIG. 5.

In addition, a conductive material may be applied to at least one of the outer regions of the external light blocking sheet 100 corresponding to the ineffective display region of the panel so that the panel and the ground can be smoothly made.

6A to 6B are views illustrating various embodiments of the laminated structure of the external light blocking sheet according to the present invention.

6A to 6B, the external light blocking sheet 200 according to the present invention includes an AR / NIR sheet 210, an external light blocking layer 220, and an optical characteristic sheet 320.

The AR / NIR sheet 210 is an anti-reflection (AR) layer 211 having a function of reducing glare by preventing light from being reflected from the outside on the front surface of the base sheet 213 made of a transparent plastic material. The NIR (Near Infrared) shielding layer 212 is attached to the rear surface to shield the near infrared rays emitted from the panel so that signals transmitted using infrared rays such as a remote controller can be normally transmitted.

In general, the external light is most often present inside or outside the user's head. The external light blocking layer 230 is attached to effectively block such external light to improve the clear contrast of the PDP.

In addition, as shown in FIG. 6B, the optical sheet 320 may further include an optical sheet 320 to improve color temperature and luminance characteristics of light emitted from the panel. At this time, the optical characteristic sheet 320 is laminated to the optical characteristic layer 321 made of a predetermined dye and the adhesive on the front or rear of the base sheet 322 made of a transparent plastic material.

On the other hand, not limited to the lamination order shown in Figures 6a to 6b, the lamination order of each sheet may be laminated differently by those skilled in the art. In addition, at least one layer of each sheet may be omitted. In addition, at least one of the basesheets included in each sheet may be omitted, or a glass that is not made of plastic may be used to improve the function of protecting the panel. In addition, it may include an EMI shielding layer that is commonly used to increase the electromagnetic shielding efficiency.

7 is a view showing an embodiment of a plasma display device according to the present invention.

A plasma display device according to an exemplary embodiment of the present invention will be described with reference to FIG. 7, and overlapping contents described with reference to FIGS. 1 to 6B will be omitted.

The external light shielding sheet 100 according to the present invention is most preferably attached to the front of the panel, the external light shielding sheet 100 further includes at least any one of an AR layer, NIR shielding layer, optical characteristics layer, EMI shielding layer. You may.

As described above, the plasma display device according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and is applied by those skilled in the art within the technically protected scope of the present invention. This is possible.

In the plasma display device of the present invention configured as described above, an external light blocking sheet that blocks light incident from the outside is attached to the front surface of the panel to effectively implement a black image, and improve contrast of bright room.

In addition, the pattern portion of the external light shielding sheet is formed to include a conductive material, thereby preventing the electromagnetic waves generated from the inside of the panel from being emitted to the outside.

Claims (15)

A base portion through which light is transmitted; And An external light blocking sheet formed on the base part and having a pattern part having a refractive index smaller than that of the base part, The pattern portion has a cross-sectional shape having a larger width at the lower end than the upper end, And a reflective layer is formed on at least one of left and right inclined surfaces of the pattern portion. The method of claim 1, And the pattern portion is formed of a metal material such as copper (Cu), aluminum (Al), titanium (Ti), lead (Pb), and the like. The method of claim 1, And the pattern portion is formed by coating a conductive material on a carbon-based material. The method of claim 1, And the pattern portion is formed by applying an oxide such as copper oxide, copper dioxide, iron oxide, or the like. The method of claim 3, wherein And the conductive material has a resistance of 0.001Ω to 2.5Ω. The method of claim 1, Plasma display device, characterized in that the transparent conductive material is laminated on any one of the front, rear surfaces of the external light shielding sheet. The method of claim 6, The transparent conductive material is indium tin oxide (Indium-Tin-Oxide) characterized in that the plasma display device. The method of claim 1, The thickness of the external light shielding sheet is a plasma display device, characterized in that 20um to 250um. The method of claim 1, And the refractive index of the pattern portion is 0.3 times to 0.99 times the refractive index of the base portion. The method of claim 1, And the pattern portion is formed in a darker color than the base. The method of claim 1, And a lower end of the pattern part is disposed toward the panel side, and an upper end of the pattern part is disposed toward the side where external light is incident. The method of claim 1, And a top width of the pattern portion is 130 μm or less. The method of claim 1, The width of the bottom of the pattern portion is a plasma display device, characterized in that formed in 5um to 150um. The method of claim 1, The external light blocking sheet may include an AR layer to prevent reflection of external light; And A NIR shielding layer for shielding near infrared rays emitted from the panel; And at least one of an optical characteristic layer for improving color temperature and luminance of the panel. The method of claim 1, The external light blocking sheet is installed on the front of the panel plasma display device.

Images