KR100769912B1 - Plasma display device - Google Patents

Abstract

A plasma display device is provided to improve picture quality by reflecting light on a brown barrier rib and transmitting the reflected light through a blue dielectric layer. A plasma display device includes an upper substrate(100), a blue dielectric layer(110), a lower substrate(200), and a brown barrier rib(220). The blue dielectric layer is formed on the upper substrate. The lower substrate is opposite to the upper substrate. The brown barrier rib is formed between the upper substrate and the lower substrate. The blue dielectric layer includes a blue dye. The blue dielectric layer includes one or more components of CuO, CoAl2O4, CoO, Co3O4, CoCO3, NiO, Cr2O3, Pr2O3, Er2O3, and Nd2O3. The brown barrier rib includes one or more components of FeTiO2, MnO2, FeO, Fe2O3, Bi2O3.

Description

 Plasma Display Device

1 is a perspective view showing an embodiment of a structure of a plasma display panel according to the present invention;

2 is a diagram illustrating an embodiment of an electrode arrangement of a plasma display panel;

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

4 is a timing diagram illustrating an embodiment of driving signals for driving a plasma display panel;

5 is a cross-sectional view showing the structure of a first embodiment of a plasma display device according to the present invention;

6 is a cross-sectional view showing the structure of a second embodiment of a plasma display device according to the present invention.

<Explanation of symbols on main parts of the drawings>

100: upper substrate 110: blue dielectric layer

200: lower substrate 210: lower dielectric layer

220: bulkhead

The present invention relates to a plasma display device, and more particularly to a plasma display device with improved bright contrast.

Plasma Display Panels (hereinafter referred to as PDPs) generate a discharge by applying a predetermined voltage to the electrodes installed in the discharge space, and plasma generated during gas discharge excites the phosphor to display an image including characters or graphics. As a device to be large in size, light in weight, and thin in plane, it is possible to provide a wide viewing angle up, down, left and right, and to realize full color and high brightness.

However, in the conventional plasma display apparatus, when the panel is observed in a bright room, the black image is bright on a dark screen due to the light reflected by the panel, and thus the contrast is lowered.

The present invention has been made to solve the above problems of the prior art, to provide a plasma display device that improves the brightness and brightness of the discharge while using a blue dielectric without a separate black matrix to improve the brightness of the object There is this.

The first feature of the plasma display device according to the present invention for solving the above problems is an upper substrate, a blue dielectric layer formed on the upper substrate, a lower substrate facing the upper substrate, between the upper substrate and the lower substrate It is configured to include a brown partition wall formed in.

In addition, a second feature of the plasma display device according to the present invention is an upper substrate, a blue dielectric layer formed on the upper substrate, a lower substrate facing the upper substrate, and a partition wall formed between the upper substrate and the lower substrate. It is configured to include, the partition is formed of two or more layers, the top layer is characterized in that the brown.

Here, the blue dielectric layer comprises a pigment that is colored blue.

In addition, the blue dielectric layer may be CoAl ₂ O ₄ , CuO, CoO, Nd ₂ O ₃ , NiO, Cr ₂ O ₃ , Pr ₂ O ₃ , Co ₃ O ₄ , Er ₂ O ₃ At least one component.

The brown partition includes at least one of Bi ₂ O ₃ , FeO ₂ , Fe ₂ O ₃ , and MnO ₂ .

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

1 is a perspective view showing an embodiment of a structure of a plasma display panel according to the present invention.

As shown in FIG. 1, the plasma display panel includes a scan electrode 11, a sustain electrode 12, a sustain electrode pair formed on the upper substrate 10, and an address electrode 22 formed on the lower substrate 20. It includes.

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 the bus electrodes 11b and 12b. 12b) may be formed of a metal such as silver (Ag) or chromium (Cr) or a stack of chromium / copper / chromium (Cr / Cu / Cr) or a stack of chromium / aluminum / chromium (Cr / Al / Cr). . The bus electrodes 11b and 12b are formed on the transparent electrodes 11a and 12a to serve to reduce voltage drop caused by the transparent electrodes 11a and 12a having high resistance.

Meanwhile, according to the exemplary embodiment of the present invention, the sustain electrode pairs 11 and 12 may not only have a structure in which the transparent electrodes 11a 12a and the bus electrodes 11b and 12b are stacked, but also the buses without the transparent electrodes 11a and 12a. Only the electrodes 11b and 12b may be configured. This structure does not use the transparent electrodes (11a, 12a), there is an advantage that can lower the cost of manufacturing the panel. The bus electrodes 11b and 12b used in this structure may be various materials such as photosensitive materials in addition to the materials listed above.

Between the transparent electrodes 11a and 12a of the scan electrode 11 and the sustain electrode 12 and the bus electrodes 11b and 11c, external light generated from the outside of the upper substrate 10 is absorbed to reduce reflection. Black matrixes (BMs, 15) are arranged that function to block light and to improve the purity and contrast of the upper substrate 10.

The black matrix 15 according to the exemplary embodiment of the present invention is formed on the upper substrate 10, the first black matrix 15 and the transparent electrodes 11a and 12a formed at positions overlapping the partition wall 21. And the second black matrices 11c and 12c formed between the bus electrodes 11b and 12b. Here, the first black matrix 15 and the second black matrices 11c and 12c, also called black layers or black electrode layers, may be simultaneously formed and physically connected in the formation process, or may not be physically connected.

In addition, when physically connected and formed, the first black matrix 15 and the second black matrix 11c and 12c may be formed of the same material, but may be formed of different materials when they are formed separately.

The upper dielectric layer 13 and the passivation layer 14 are stacked on the upper substrate 10 having the scan electrode 11 and the sustain electrode 12 side by side. Charged particles generated by the discharge are accumulated in the upper dielectric layer 13, and the protective electrode pairs 11 and 12 may be protected. The protective film 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 in a direction crossing the scan electrode 11 and the sustain electrode 12. In addition, a lower dielectric layer 24 and a partition wall 21 are formed on the lower substrate 20 on which the address electrode 22 is formed.

In addition, the phosphor layer 23 is formed on the surfaces of the lower dielectric layer 24 and the partition wall 21. The partition wall 21 has a vertical partition wall 21a and a horizontal partition wall 21b formed in a closed shape, and physically distinguishes the discharge cells, and prevents ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. .

Referring to FIG. 1, it is preferable that a filter 25 is formed on the front surface of the plasma display panel according to the present invention, and the filter 25 has an external light blocking layer, an anti-reflection (AR) layer, and a near infrared shielding (NIR). Layer or EMI shielding layer.

When the distance between the filter 25 and the panel is 10㎛ to 30㎛, it can effectively block the light incident from the outside, it is possible to effectively emit the light generated in the panel to the outside. In addition, in order to protect the said panel from the pressure from the outside etc., the space | interval between the filter 25 and the said panel can be 30 micrometers-120 micrometers.

An adhesive layer may be formed between the filter 25 and the panel to attach the filter 25 to the panel.

In an embodiment of the present invention, not only the structure of the partition wall 21 illustrated in FIG. 1, but also the structure of the partition wall 21 having various shapes may be possible. For example, a channel in which a channel usable as an exhaust passage is formed in at least one of the differential partition structure, the vertical partition 21a, or the horizontal partition 21b having different heights of the vertical partition 21a and the horizontal partition 21b. A grooved partition structure having a groove formed in at least one of the type partition wall structure, the vertical partition wall 21a, or the horizontal partition wall 21b may be 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.

Meanwhile, in one embodiment of the present invention, although the R, G and B discharge cells are shown and described as being arranged on the same line, it may be arranged in other shapes. For example, a Delta type arrangement in which R, G, and B discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may be not only rectangular, but also various polygonal shapes such as a pentagon and a hexagon.

In addition, the phosphor layer 23 emits light by ultraviolet rays generated during gas discharge to generate visible light of any one of red (R), green (G), and blue (B). Here, an inert mixed gas such as He + Xe, Ne + Xe and He + Ne + Xe for discharging is injected into the discharge space provided between the upper / lower substrates 10 and 20 and the partition wall 21.

FIG. 2 is a diagram illustrating 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 electrode lines Y1 to Yn, the sustain electrode lines Z1 to Zn, and the address electrode lines X1 to Xn, respectively. The scan electrode lines Y1 to Yn may be driven sequentially or simultaneously, and the sustain electrode lines Z1 to Zn may be driven simultaneously. The address electrode lines X1 to Xn may be driven by being divided into odd-numbered lines and even-numbered lines, or sequentially driven.

Since the electrode arrangement shown in FIG. 2 is only an embodiment of the electrode arrangement of the plasma 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 electrode lines among the scan electrode lines Y1 to Yn are simultaneously scanned may be used. In addition, the address electrode lines X1 to Xn may be driven by being divided up and down in the center portion of the panel.

3 is a timing diagram illustrating an embodiment of a time division driving method by dividing a frame into a plurality of subfields. The unit frame may be divided into a predetermined number, for example, eight subfields SF1, ..., SF8 to realize time division gray scale display. Each subfield SF1, ... SF8 is divided into a reset section (not shown), an address section A1, ..., A8 and a sustain section S1, ..., S8.

Here, according to an embodiment of the present invention, the reset period may be omitted in at least one of the plurality of subfields. For example, the reset period may exist only in the first subfield or may exist only in a subfield about halfway between the first subfield and all the subfields.

In each address section A1, ..., A8, an address signal is applied to the address electrode X, and a scan signal corresponding to each scan electrode Y is sequentially applied by one scan electrode line.

In each of the sustain periods S1, ..., S8, a sustain signal is alternately applied to the scan electrode Y and the sustain electrode Z, so that wall charges are formed in the address periods A1, ..., A8. Sustain discharge occurs in the discharge cells.

The luminance of the plasma display panel is proportional to the number of sustain discharge pulses in the sustain discharge 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 different sustains at a ratio of 1, 2, 4, 8, 16, 32, 64, and 128. The number of signals can be assigned. In order to obtain luminance of 133 gray levels, cells may be sustained by addressing the cells during the subfield 1 section, the subfield 3 section, and the subfield 8 section.

The number of sustain discharges allocated to each subfield may be variably determined according to weights of the subfields according to the APC (Automatic Power Control) step. 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, a plasma display panel may be driven by dividing one frame into eight or more subfields, such as 12 or 16 subfields.

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.

4 is a timing diagram illustrating an embodiment of driving signals for driving a plasma display panel with respect to the divided subfield.

The subfield is formed by a pre-reset period and a pre-reset period for forming positive wall charges on the scan electrodes Y and negative wall charges on the sustain electrodes Z. A reset section for initializing the discharge cells of the entire screen using the wall charge distribution, an address section for selecting the discharge cells, and a sustain section for maintaining the discharge of the selected discharge cells; .

The reset section includes a setup section and a setdown section. In the setup section, rising ramp waveforms (Ramp-up) are simultaneously applied to all scan electrodes to generate fine discharges in all discharge cells. Thus, wall charges are generated. In the set-down period, a falling ramp waveform (Ramp-down) falling at a positive voltage lower than the peak voltage of the rising ramp waveform (Ramp-up) is simultaneously applied to all the scan electrodes (Y), thereby eliminating discharge discharge in all the discharge cells. Generated, thereby eliminating unnecessary charges during wall charges and space charges generated by the setup discharges.

In the address period, a scan signal 410 having a negative scan voltage Vsc is sequentially applied to the scan electrode, and an address signal having a positive address voltage Va on the address electrode X so as to overlap the scan signal. 400 is applied. The address discharge is generated by the voltage difference between the scan signal 410 and the address signal 400 and the wall voltage generated during the reset period, thereby selecting the cell. Meanwhile, a signal for maintaining a sustain voltage is applied to the sustain electrode during the set down period and the address period.

In the sustain period, a sustain signal is alternately applied to the scan electrode and the sustain electrode to generate sustain discharge in the form of surface discharge between the scan electrode and the sustain electrode.

The driving waveforms shown in FIG. 4 are the first embodiment of signals for driving the plasma display panel according to the present invention, and the present invention is not limited by the waveforms shown in FIG. For example, the pre-reset period may be omitted, and the polarity and the voltage level of the driving signals illustrated in FIG. 4 may be changed as necessary, and an erase signal for erasing wall charge may be applied to the sustain electrode after the sustain discharge is completed. It may be. In addition, a single sustain drive in which a sustain signal is applied to only one of the scan electrode (Y) and the sustain (Z) electrode to generate a sustain discharge is also possible.

5 is a cross-sectional view showing the structure of a first embodiment of a plasma display device according to the present invention. FIG. 5 illustrates only the upper substrate 110, the upper dielectric layer 110, the lower substrate 200, the lower dielectric layer 210, and the partition wall 220 in the plasma display apparatus. The remaining components are omitted. The remaining components refer to FIG. 1 above.

Referring to FIG. 5, the first embodiment of the plasma display apparatus according to the present invention is a blue dielectric layer in which the upper dielectric layer 110 is formed of a blue dielectric, and the barrier rib 220 is a brown brown barrier rib. It is done.

The blue dielectric layer 110 is a transparent dielectric layer having a blue color including a blue color pigment.

The blue dielectric layer 110 serves to improve the overall color temperature of the panel, and at the same time, the partition wall 220 together with the partition 220 improves the clear room contrast.

The blue dielectric 110 may be formed of CuO, CoAl ₂ O ₄ , CoO, Co ₃ O ₄ , CoCO ₃ , NiO, Cr ₂ O ₃ , Pr ₂ O ₃ , Er ₂ O ₃ , and at least one component of Nd ₂ O ₃ .

When the copper oxide (CuO) is mixed with the alkaline flux with the main color, it produces a blue color like turquoise. Copper oxide or copper carbonate (CuCO ₃ ) has almost the same effect, but when the same amount is added, the copper oxide has a darker color.

Cobalt oxide and the like (CoAl ₂ O _4, CoO, Co ₃ O ₄ ) and cobalt carbonate (CoCO ₃ ) has almost the same effect, but the cobalt oxide has a stronger color. Cobalt oxide is a blue color developer, and when mixed with manganese, chromium and iron oxide, it changes from gray to black. When mixed with a small amount of cobalt and manganese or magnesium carbonate, the pink color is light purple. Cobalt is a very strong colorant, so adding about 1% gives it a very strong blue color. Therefore, when iron oxide and cobalt are added in the amount of 20 to 1, the color becomes much weaker and gives a color like blue and white of Joseon Dynasty.

The nickel oxide (NiO) is blue like zircon. It is usually used as an auxiliary colorant and improves the color development of other materials. It is a blue colorant with zinc and green color with magnesium.

The chromium oxide (Cr ₂ O ₃ ) is a green color developer and may be blue with other oxides.

The rare earth oxides (Pr ₂ O ₃ , Er ₂ O ₃ , Nd ₂ O ₃ ) and the like also appear blue with other compounds.

The blue dielectric layer 110 is not limited to the various oxides described above, and may include a component that causes blue color to develop.

The blue dielectric layer 110 is formed by mixing a pigment that is colored in blue with a mother glass powder, mixing an organic binder to form a paste, applying the paste onto a substrate, and baking the paste. Here, a screen printing method, a coating method using a coater, a green sheet laminating method, or the like may be used as a method of forming the blue dielectric layer 110, but various methods may be used.

The brown partition wall 220 is formed between the upper substrate 100 and the lower substrate 200. It is mainly formed on the lower dielectric layer 210 formed on the lower substrate 200 to partition the discharge cells.

The brown partition wall 220 includes at least one of FeTiO ₂ , MnO ₂ , FeO, Fe ₂ O ₃ , and Bi ₂ O ₃ .

The composition is not limited to those listed above as the component of the pigment that makes it appear brown, and various compositions can be used.

The rutile (FeTiO ₂ ) is a pulverized ore containing titanium and iron oxide, which has a similar effect to pure titanium, and has a brown color in the yellow series upon oxidation firing.

The manganese oxide (MnO ₂ ) is mainly used as a brown colorant. When used with cobalt and nickel, it produces a black color. When used with cobalt, it becomes black in color, and when combined with a small amount of alkali flux, pink to purple and dark red. Adjusting the concentration gives a brown color.

The iron oxides (FeO, Fe ₂ O ₃ , Fe ₃ O ₄ ) are black ferrous oxide (FeO), red ferric oxide (Fe ₂ O ₃ ), black red ferric oxide (Fe ₃ O ₄ ) etc., usually reddish brown to yellowish brown. It is also used as a color softener to make strong colors such as cobalt and chrome into soft colors. Dielectrics mixed with iron oxide have a blue color including blue violet in reduction firing, but produce brown color in oxidative firing.

The bismuth oxide (Bi ₂ O ₃ ) is a glass forming agent or glass formulating agent that exhibits a brown color, lowers the glass transition temperature (Tg) of the lead-free glass composition, and serves to increase the coefficient of thermal expansion (TEC) and dielectric constant.

The brown partition wall 220 may be formed by a sand blasting method by exposing and developing a paste containing a pigment component that develops the brown color as described above, or may be formed by a method such as a lift-off method or a photosensitive paste method. It is not limited to the above method.

According to the first embodiment of the plasma display device according to the present invention configured as described above, the light L reflected from the brown partition wall or the brown partition wall TOP becomes black when mixed with the blue dielectric layer. .

In other words, the color of the blue dielectric and the brown partitions is black. Therefore, when the panel is viewed in a bright room, the light reflected from the top portion of the barrier rib or the bottom of the barrier rib becomes black when passing through the blue dielectric layer, so that the contrast of the bright room is improved. When the clear room contrast is thus improved, the image is perceived more clearly.

The complementary color of blue is orange, but since the blue dielectric is transparent blue rather than opaque blue, it appears lighter than opaque blue, so it appears more black in the case of brown, which is darker than orange.

6 is a cross-sectional view showing the structure of a second embodiment of a plasma display device according to the present invention. 6 illustrates only a partition wall 220 formed of an upper substrate 110, an upper dielectric layer 110, a lower substrate 200, a lower dielectric layer 210, and two or more layers in the plasma display apparatus. The remaining components are omitted. The remaining components refer to FIG. 1 above.

Referring to FIG. 6, the second embodiment of the plasma display device according to the present invention has the same structure as the first embodiment including the blue dielectric layer 110, but only the top portion of the partition wall is brown, and the rest is brown. The lower part is characterized by white or light color.

Thus, the blue dielectric layer 110 is substantially the same as in the first embodiment.

The partition wall 220 may be formed of at least two layers. Here, the layers are distinguished on the basis of color.

The top layer 221, which is a top portion of the partition wall, includes a pigment that is colored brown as a brown partition wall. Here, the uppermost layer 221 of the partition wall may be the uppermost layer when the partition wall is formed, or may be formed as a separate layer. That is, after the partition is formed, another brown layer may be formed on the partition to have the same function.

The uppermost layer 221 of the partition includes at least one of FeTiO ₂ , MnO ₂ , FeO, Fe ₂ O ₃ , Bi ₂ O ₃ . Since the description of the composition is substantially the same as in Example 1, the description is omitted.

Below the top layer 222 of the partition wall is formed to have a bright color. The lower portion 222 of the partition wall is a portion to which the phosphor is coated, and the vacuum ultraviolet rays generated by the discharge are formed in bright colors to increase the luminance of the light generated by exciting the phosphor. The lowermost layer 222 of the partition wall is preferably formed to have a white color.

 The uppermost layer 221 of the barrier rib is brown, and light passing through the blue dielectric layer 110 is reflected by the uppermost layer 221 to be recognized as black by color mixing, and the lower part of the barrier rib 222 in the discharged cell. The brightness of the discharge is improved due to the bright color of, so the contrast of the bright room is further improved.

That is, according to the second embodiment of the present invention configured as described above, when the light L reflected from the uppermost layer of the partition passes through the blue dielectric layer 110, the light L is black due to mixed color. Since the brightness difference in is clear, the contrast can be improved to achieve a clear picture quality.

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 may be applied within the scope of the technical idea.

In the plasma display device according to the present invention configured as described above, the light reflected by the brown partition wall becomes black due to mixed color as the light passes through the blue dielectric layer, so that the contrast of the bright room is improved, and the lower part of the partition wall is formed in a bright color to discharge There is an effect of improving the brightness. As a result, it is possible to realize a clear picture quality.

Claims (11)

An upper substrate; A blue dielectric layer formed on the upper substrate; A lower substrate facing the upper substrate; And a brown partition wall formed between the upper substrate and the lower substrate. The method according to claim 1, And the blue dielectric layer comprises a pigment that is colored blue. The method according to claim 1, The blue dielectric layer may be formed of CuO, CoAl ₂ O ₄ , CoO, Co ₃ O ₄ , CoCO ₃ , A plasma display device comprising at least one of NiO, Cr ₂ O ₃ , Pr ₂ O ₃ , Er ₂ O ₃ , and Nd ₂ O ₃ . The method according to claim 1, The brown partition wall comprises at least one of FeTiO ₂ , MnO ₂ , FeO, Fe ₂ O ₃ , Bi ₂ O _{3 The} plasma display device. The method according to claim 1, The plasma display device is characterized in that the light reflected from the brown partition wall or the brown partition wall (TOP) appears black by the color mixture when passing through the blue dielectric layer. An upper substrate; A blue dielectric layer formed on the upper substrate; A lower substrate facing the upper substrate; Comprising a partition formed between the upper substrate and the lower substrate, The barrier rib is formed of two or more layers, and the uppermost layer is brown. The method according to claim 6, And the blue dielectric layer comprises a pigment that is colored blue. The method according to claim 6, The blue dielectric layer includes at least one of CuO, CoAl ₂ O ₄ , CoO, Co ₃ O ₄ , CoCO ₃ , NiO, Cr ₂ O ₃ , Pr ₂ O ₃ , Er ₂ O ₃ , and Nd ₂ O ₃ . Plasma display device, characterized in that. The method according to claim 6, And the uppermost layer of the partition wall comprises at least one of FeTiO ₂ , MnO ₂ , FeO, Fe ₂ O ₃ , and Bi ₂ O ₃ . The method according to claim 6, And the uppermost layer of the partition wall is white. The method according to claim 6, The plasma display apparatus is characterized in that the light reflected from the uppermost layer of the partition wall is displayed in black by the mixed color when passing through the blue dielectric layer.

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