KR100806307B1 - Plasma Display Device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus, wherein a black matrix formed on a first panel is removed by attaching a black matrix sheet having black matrices arranged on first and second surfaces of a base sheet to a front surface of the panel. The manufacturing process can be simplified, and at the same time, the clear room contrast of the screen is also improved.

PDP. Clear filter. Black Matrix, Real Name Contrast

Description

Plasma Display Device

1 illustrates an embodiment of a panel structure of a plasma display device;

FIG. 2 is a diagram illustrating an embodiment of a method in which one frame of an image of a plasma display apparatus is time-division driven into a plurality of subfields;

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

4 is a cross-sectional view showing the structure of a black matrix sheet of the plasma display device according to the present invention;

5 is a view showing an embodiment of the structure of a black matrix sheet of the plasma display device according to the present invention;

6 is a front view showing a black matrix sheet of the plasma display device according to the present invention;

7a to 8b are views showing embodiments of the black matrix sheet according to the present invention,

9 illustrates an embodiment of a structure 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, and in particular, to improve the contrast of a panel, by removing the black matrix and the black layer formed on the panel, and forming a black matrix sheet to be attached to the front of the panel, thereby simplifying the manufacturing process of the panel. The present invention relates to a plasma display device capable of maintaining a clear room contrast.

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, light weight, and planar thickness, and provides a wide viewing angle up, down, left, and right, and realize full color and high brightness.

The PDP is formed on at least one of the upper substrate and the lower substrate of the panel for the Black Matrix (BM), which serves to improve the clear contrast, but the black matrix is formed on the upper substrate or the lower substrate of the panel. There is a problem that the increase in the manufacturing cost of the panel, the manufacturing process is complicated and the defective product is mass produced.

The present invention has been made to solve the above-described problems of the prior art, and even if the black matrix or black layer formed on the upper substrate and the lower substrate of the panel is removed, it is attached to the front of the panel so that the clear contrast of the panel is not reduced. It is an object of the present invention to provide a plasma display device including a black matrix sheet.

Plasma display device according to the present invention for solving the above problems is a panel; The black matrix sheet having the black matrix arranged on the first and second surfaces of the base sheet is attached to the front surface of the panel.

In this case, the width of the black matrix is 150um to 560um, and the spacing of each of the black matrices arranged on the first and second surfaces is 160um to 1420um. In addition, in two black matrices arranged adjacent to each other on the first surface, one black matrix is arranged on the second surface between the two black matrices, and the first black matrix is arranged closest to the black matrix arranged on the second surface. The distance between the black matrix arranged on the surface is 0 to 860 um, and the distance between the black matrix arranged on the second surface and another black matrix arranged relatively far from the first surface is 150 um to 860 um. It is characterized by.

In addition, the area in which the black matrix is arranged in the total area of the black matrix sheet is characterized in that 20% to 70%.

The black matrix sheet may further include an AR layer for preventing reflection of external light, an NIR shielding layer for shielding near infrared rays emitted from the panel, and an EMI shielding layer for shielding electromagnetic waves.

In this case, the black matrix sheet is attached to the front of the panel by the adhesive, the adhesive is characterized in that the PSA (Pressure Sensitive Adhesive) series.

In addition, the thickness of the base sheet is 80um to 130um, characterized in that the transparent plastic material.

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

1 is a perspective view 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. Include.

 The sustain electrode pairs 11 and 12 generally include transparent electrodes 11a and 12a and bus electrodes 11b and 12b formed of indium tin oxide (ITO), and bus electrodes 11b and 12b. Silver may be formed of a metal such as silver (Ag), chromium (Cr), or a lamination of chromium / copper / chromium (Cr / Cu / Cr) or a lamination of chromium / aluminum / chromium (Cr / Al / Cr). In addition, 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.

On the other hand, as in the embodiment of the present invention, the sustain electrode pairs 11 and 12 have not only a structure in which the transparent electrodes 11a and 12a and the bus electrodes 11b and 12b are stacked, but also without the transparent electrodes 11a and 12a. Only the bus electrodes 11b and 12b may be formed. 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.

The upper dielectric layer 13 and the protective layer 14 are stacked on the upper substrate 10 on which the scan electrode 11 and the sustain electrode 12 are formed, respectively. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective layer 14 may function to protect the sustain electrode pairs 11 and 12. The upper dielectric layer 13 is protected from sputtering, and the emission efficiency of secondary electrons is increased. In addition, although magnesium oxide (MgO) is generally used for the protective layer 14, Si-MgO added with silicon (Si) may be used. Here, the content of silicon (Si) added to the protective layer 14 may be 50PPM to 200PPM based on the weight percent (wt%).

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 barrier ribs 21 are formed, and phosphors 23 are formed on the surfaces of the lower dielectric layer 24 and the barrier ribs 21 to emit visible light by generating ultraviolet rays during gas discharge.

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, each of the sustain electrode pairs 11 and 12 may include two or more electrode lines, and a structure further including other electrodes is also possible.

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. A channel-shaped partition structure and a vertical partition wall having a channel usable as an exhaust passage in at least one of the differential partition structure, the vertical partition wall 21a, or the horizontal partition wall 21b having different heights of the horizontal partition wall 21b and the horizontal partition wall 21b ( A grooved partition wall structure having a groove formed in at least one of 21a) or the horizontal partition wall 21b may be possible. In addition, a structure such as a fish bone having a predetermined gap on the vertical partition wall 21a and having a protrusion is also possible.

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

FIG. 2 is a diagram illustrating an embodiment of a method in which one frame of an image of a plasma display panel is time-divided and driven into a plurality of subfields.

Referring to FIG. 2, a unit frame may be time-divisionally driven to 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. Causes sustain discharge.

Here, the reset section may be omitted in at least one of the plurality of subfields. For example, the reset section may exist only in the first subfield, or may exist only in the middle subfield of the first subfield and all subfields.

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 gradations, each subfield in turn has a different sustain pulse at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of can be assigned. Alternatively, in order to obtain 133 gray levels, sustain discharge is performed by addressing cells during the subfield 1 period, the subfield 3 period, and the subfield 8 period.

Meanwhile, the number of sustain discharges allocated to each subfield may be variably determined according to the weights of the subfields according to the APC (Automatic Power Control) step. That is, in FIG. 2, 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.

In addition, the number of sustain discharges allocated to each subfield can be variously modified in consideration of gamma characteristics and panel characteristics. For example, the gray level assigned to subfield 4 may be lowered from 8 to 6, and the gray level assigned to subfield 6 may be increased from 32 to 34.

3 is a diagram illustrating an embodiment of an electrode arrangement of a plasma display panel.

Referring to FIG. 3, the plurality of discharge cells 15 are provided at the intersections of the scan electrodes Y1 to Yn, the sustain electrodes Z1 to Zn, and the address electrodes X1 to Xn, respectively. Each of the plurality of scan electrodes Y1 to Yn is sequentially driven by the scan driver 40, and the plurality of sustain electrodes Z1 to Zn are commonly driven while receiving a sustain signal supplied from the sustain driver 60. . In addition, the address electrodes X1 to Xn receive a data signal synchronized with a scan signal from the address driver 50.

Meanwhile, since the electrode arrangement and driving method shown in FIG. 3 are only one embodiment 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. 3. For example, a dual scan method in which two scan electrodes of the scan electrodes Y1 to Yn are simultaneously scanned is also possible. Further, the address electrodes X1 to Xn are divided into odd address electrodes X1, X3, ..., Xn-1 and even-numbered address electrodes X2, X4, ..., Xn, and the odd address driver It is also possible to arrange the electrodes having the even-th address and receiving the driving signals.

4 is a cross-sectional view illustrating a black matrix sheet structure of a plasma display device according to the present invention.

Referring to FIG. 4, the black matrix sheet 100 includes a base sheet 115 and black matrices 105 and 110 arranged on both sides of the base sheet 115.

The base sheet 115 is a black matrix (105, 110) on both sides to be stably arranged, using a transparent plastic material such as polyethylene terephtalate (PET) to easily transmit light, the base sheet 115 The thickness T of is formed from 80um to 130um. At this time, the thickness of the base sheet 115 may be most preferably formed to 100um considering the light transmittance, manufacturing cost saving and ease.

The first surface 115a and the second surface 115b of the base sheet 115 may include a black matrix having a function of blocking light and improving contrast by absorbing external light generated from the outside to reduce reflection. Black Matrix, BM) are arranged respectively.

Here, in the present specification, the black matrix arranged on the first surface 115a is divided into the first black matrix 105 and the black matrix arranged on the second surface 115b as the second black matrix 110.

The first black matrix 105 and the second black matrix 110 have a width H of 150 μm to 560 μm to improve the clear contrast of the panel. In this case, considering the effect of improving the bright room contrast in a range in which the brightness of the entire screen is not greatly reduced, it may be most preferable to form 150um to 360um.

In addition, the spacing of the first black matrices 105 and the spacing of the second black matrices 110 adjacent to each other may be arranged to be 160um to 1420um so that light generated in the discharge cell can pass smoothly.

Next, one second black matrix 110 is arranged between the first black matrices 105 adjacent to each other, and the first black matrix 105 of the first black matrix 105 that is most closely arranged to the second black matrix 110 is arranged. The interval is formed from 0 to 860um, and the distance between the same second black matrix 110 and the other first black matrix 105 is formed from 150um to 860um to absorb and block light incident from the outside, and Light functions to emit efficiently. At this time, in order to block the light incident from the outside as much as possible, and to efficiently emit the light of the PDP, the distance between the first black matrix 105 which is arranged closest to the second black matrix 110 is substantially 0, and It is most preferable that the distance between the other first black matrix 105 and the second black matrix 110 is arranged to be 250um to 310um.

As such, when the black matrix sheet 100 according to the present invention is attached to the front surface of the panel, the first surface 115a is the second surface toward the user in order to effectively utilize the functions of the black matrix sheet 100. It will be most desirable to attach so that the (115b) side faces the panel side.

In addition, a PSA (Pressure Sensitive Adhesive) adhesive 120 is applied between the first black matrix 105 and the second black matrix 110 to maintain and protect the shape in which the black matrix is arranged. It can be attached to the sheet (Sheet) that performs another function. Meanwhile, in FIG. 4, the adhesive 120 is applied at the same height as the black matrices 105 and 110, but may be higher than this to cover the black matrix, and other adhesives other than the PSA series may be used. The first side 115a and the second side 115b may be applied only to one side.

FIG. 5 is a perspective view illustrating the black matrix sheet structure shown in FIG. 4.

Referring to FIG. 5, in the black matrix sheet 100 according to the present invention, black matrices 105 and 110 are arranged on both sides of the base sheet 115, and a single black matrix 105 is disposed between adjacent black matrices 105. The second black matrix 110 is arranged.

Meanwhile, as illustrated in FIG. 6, the third black matrix 125 may be arranged in a direction crossing the first and second black matrices. In addition, in the present specification, the shape of the black matrix is almost linear, but may be arranged in a curved shape having a predetermined curvature that is bent upwards or downwards. In addition, in consideration of the moiré phenomenon, the black matrix may be formed in parallel with the base film at a predetermined angle.

7A to 8B are views illustrating various embodiments of the black matrix sheet according to the present invention.

7A through 7B, the black matrix sheet 200 according to the first embodiment of the present invention includes an AR / NIR layer 210, an EMI shielding layer 220, and a black matrix layer 230. do.

The AR / NIR layer 210 has an anti-reflection (AR) film 201 attached to the front surface of the transparent plastic base sheet 203 to prevent reflection of light incident from the outside, and to the rear surface thereof. A NIR (Near Infrared) shielding film is attached to shield near-infrared radiation emitted from the panel so that signals transmitted using infrared rays such as a remote controller can be normally transmitted.

The EMI shielding layer 220 is attached to the EMI shielding film 211 to shield the electromagnetic wave (EMI) on the front of the base sheet 212 of a transparent plastic material to prevent the electromagnetic wave incident from the panel is emitted to the outside. In this case, the EMI shielding film 211 is typically formed in a mesh structure by a conductive material, and the conductive material is entirely formed in the outer region where the screen is not displayed so that grounding can be performed smoothly.

The function of the black matrix layer 230 is omitted since it overlaps with the description of FIG. 4.

The AR / NIR layer 210, the EMI shielding layer 220, and the black matrix layer 230 have a pressure-sensitive adhesive 240 formed therebetween, and can be easily and firmly attached to the front surfaces of the respective layers and the PDP. Make sure In addition, the material of the base sheet included in each layer will most preferably use substantially the same material for ease of manufacture.

Meanwhile, in FIG. 7A, the AR / NIR layer 210, the EMI shielding layer 220, and the black matrix layer 230 are stacked in this order. As illustrated in FIG. 7B, the AR / NIR layer 210 and the black matrix are stacked. The layer 230 and the EMI shielding layer 220 may be stacked in this order, and any one layer may be omitted.

Also, like the black matrix sheet 300 according to the second embodiment of the present invention shown in FIGS. 8A to 8B, the optical layer 320 having a function of improving color temperature and luminance characteristics of light incident from the panel is provided. It may be formed to include more.

In addition, at least one of the basesheets included between the films may be omitted, and a rigid glass may be used instead of a transparent plastic material.

9 illustrates a plasma display device according to the present invention.

As shown in Figure 9, the black matrix sheet according to the present invention is attached to the front of the panel. 9 shows that the black matrix sheet including only the black matrix layer is attached, but the black matrix sheets according to the first and second embodiments according to the present invention may be attached.

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.

The plasma display device of the present invention configured as described above has the effect of facilitating the manufacturing process of the panel by removing the black matrix formed in the panel and forming the black matrix sheet attached to the front surface of the panel.

In addition, the plasma display device of the present invention forms the black matrix sheet on both sides of the base sheet to effectively block and absorb light incident from the outside and to radiate the light generated from the panel efficiently, thereby increasing the contrast and brightness. There is.

Claims (11)

panel; And And a black matrix sheet including a base sheet bonded to the front surface of the panel, a first surface to which the base sheet and the panel are bonded, and a black matrix formed on a second surface opposite to the first surface, respectively. , The black matrix sheet, And one black matrix is arranged on the second surface between two black matrices arranged adjacent to each other on the first surface. The method of claim 1, The width of the black matrix plasma display device, characterized in that 150um to 560um. The method of claim 1, And a spacing of each of the black matrices arranged on the first and second surfaces is 160um to 1420um. The method of claim 1, And a distance between the black matrices arranged on the second surface and the black matrices arranged adjacent to the first surface is 0 to 860 um. The method of claim 4, wherein The distance between the black matrix arranged on the second surface and another black matrix arranged relatively far from the first surface is 150um to 860um. The method of claim 1, And an area in which the black matrix is arranged in the total area of the black matrix sheet is 20% to 70%. The method of claim 1, The black matrix sheet is an AR layer to prevent reflection of external light, A NIR shielding layer for shielding near infrared rays emitted from the panel; Plasma display device further comprises an EMI shielding layer for shielding electromagnetic waves. The method of claim 1, The black matrix sheet is attached to the front of the panel by a pressure-sensitive adhesive plasma display device. The method of claim 8, The pressure-sensitive adhesive is a plasma display device, characterized in that the pressure sensitive adhesive (PSA) series. The method of claim 1, The thickness of the base sheet is a plasma display device, characterized in that 80um to 130um. The method of claim 1, The base sheet is a plasma display device, characterized in that the transparent plastic material.

Images