KR100244133B1 - Plasma display device - Google Patents

Abstract

The present invention discloses a PDP having a novel configuration.

In the conventional PDP, the partition wall and both electrodes are orthogonal to each other, so that the opposite area between the electrodes is small and the projection area of the front electrode is large, resulting in low luminance and high crosstalk between adjacent electrodes.

In the present invention, the rear electrode extends diagonally on the partition wall, and the front electrode perpendicular to the partition wall extends on the extension line between the centers of two adjacent sides of the partition wall, thereby greatly reducing the projection area of the front electrode while maintaining the opposing area between the electrodes. The luminance was increased and crosstalk was effectively prevented.

Description

Plasma display device

1 is a side cross-sectional view showing the basic configuration of the PDP.

2 is a projection plan view showing an electrode arrangement of a conventional PDP.

3 is a projection plan view showing a configuration of a PDP according to the present invention.

4 is a block diagram comparing the opposed area and the projected area of the present invention and a conventional PDP.

5 is a projection plan view showing another embodiment of the present invention PDP.

* Explanation of symbols for main parts of the drawings

P1, P2: front and back substrates E1, E2: front and back electrodes

B: barrier rib E3: auxiliary electrode

The present invention relates to a plasma display panel (PDP).

PDP, which is a type of flat panel display device using gas discharge for image display, basically has electrodes E1 and E2 intersecting with each other on the front substrate P1 and the rear substrate P2 as shown in FIGS. 1 and 2. And discharging the discharge gas into the discharge space (V) partitioned by the partition (B).

On the other hand, an appropriate phosphor is coated on the electrodes E1 and E2 as needed. The electrode E1 and E2 on the side on which the phosphor is applied are composed of a reflective type and a transmissive PDP depending on the application position thereof.

The PDP is driven by a matrix driving method, which sequentially scans the transverse electrode E2 and writes data to the longitudinal electrode E1, that is, addressing. It is done in such a way.

However, since the PDP does not immediately start discharging by selecting the positive electrodes E1 and E2, it is difficult to obtain high light emission luminance by the matrix driving method in which the duty time is limited because there is a time delay.

Accordingly, various auxiliary electrodes are used to trigger the discharge to start immediately or to implement the memory effect of maintaining the discharge until the next selection, and AC type PDP using wall charge is also actively developed. It is becoming.

However, the most basic thing to increase the luminous intensity is the discharge intensity. The discharge intensity depends on the type, pressure and potential difference of the discharge gas, but these are almost impossible to adjust, so the opposite area between the two electrodes E1 and E2 It depends on.

However, since a high voltage of several hundred V is used in the PDP, the transparent electrode cannot be used as the electrode E1 of the front substrate P1 and the opaque metal electrode can be used.

Therefore, the projected area of the electrode E1 (the anode in the transmissive type and the cathode in the reflective type) of the front substrate P1 is preferably as small as possible, which makes it very difficult to increase the opposing area with the back electrode E2.

On the other hand, since the PDP has to inject the discharge gas after exhausting the inside, it is extremely difficult to exhaust and inject into the grid-shaped partition B partition as shown in the figure. It is preferable. However, when a gap or a hole is formed in the partition B, cross talk occurs easily between adjacent pixels during matrix driving, which causes a problem in that image quality is greatly deteriorated.

SUMMARY OF THE INVENTION In view of these various problems in the related art, an object of the present invention is to provide a PDP capable of reducing the projected area of the front electrode and increasing the opposing area with the back electrode and efficiently suppressing crosstalk.

PDP according to the present invention for achieving the above object is characterized in that the front electrode and the back electrode perpendicular to each other extends in parallel to the diagonal direction of the partition wall, the center line of the front electrode is located on the extension line of the center of the two adjacent sides of the partition wall It is done.

According to this configuration, if the opposing areas of the front electrode and the back electrode are the same as in the prior art, the projected area of the front electrode is significantly reduced, and the front electrode is shared with the pixels on both sides of the extension direction, and the number of electrodes is reduced as well. Can be effectively prevented.

Specific features and advantages of the inclined electrode PDP will become more apparent from the following description of the preferred embodiments with reference to the accompanying drawings.

In FIG. 3, the partition wall B extends in a lattice form in the longitudinal and transverse directions of both substrates (P1 and P2 in FIG. 1) as in the prior art, and the front electrode E1 and the back electrode which are orthogonal to each other by 90 °. E2 extends in the direction parallel to the diagonal direction with respect to the partition B, that is, in the direction of +/- 45 ° respectively.

Here, the rear electrode E2 extends in the + 135 ° or -45 ° direction so that its center line is located on one side diagonal of the partition B, whereas the front electrode E1 has the center line of the partition B. It is located on the extension line of the center of two adjacent sides and extends to +45 degree direction.

Accordingly, since the front electrode E1 extends across the pixels on both sides of the extension direction and is shared with the front electrodes E1, the number of the front electrodes E1 can be halved by half compared to the back electrode E2 extending in the diagonal direction of the partition B. .

Generally, the transverse electrode becomes a scan electrode and the longitudinal electrode becomes an addressing electrode. However, in this embodiment, since there is no longitudinal direction, a unique determination is difficult. However, it is preferable to drive the front electrode E1 having a small number of electrodes as the scan electrode because the duty time for one pixel can be doubled than when the back electrode E2 is used as the scan electrode.

On the other hand, since the scan electrode is generally the cathode, in the DC type PDP, it is common to apply a phosphor on the anode in order to prevent the damage of the anode due to the electron impact. Thus, the embodiment of FIG. 3 shows that the front electrode E1 is The scan electrode and back electrode E2 are suitable for being composed of a reflective PDP that is an addressing electrode.

The embodiment of FIG. 3 also has an effect of significantly reducing the projected area of the front electrode while maintaining the opposing area, which will be described with reference to FIG. 4.

In FIG. 4, when the length of one pixel assumed as the forward direction is h and the widths of the two electrodes E1 and E2 are b, respectively, in the conventional configuration indicated by the dotted line, the opposing areas between the two electrodes E1 and E2 are b ² and the projection area of the front electrode E1 is bh.

In contrast, in the embodiment of the present invention in which the rear electrode E2 extends in one diagonal direction of the partition B, and the front electrode E1 orthogonal thereto is extended along the center of two adjacent sides of the partition B, the opposite area is still present. b ^2, while the projected area of the front electrode (E1) is greatly reduced.

In this case, the projection area of the front electrode E1 becomes (h + d) b / √2-b ² , which depends on the thickness d of the partition B, for example, the thickness of the partition B ( Assuming that d) is equal to the width b of the electrodes E1 and E2 and they are each h / 4, the projection area is about 2.54b ² , which is only about 63% of the conventional projection area 4b ² .

The reduction effect of the projection area is not very sensitive to the ratio of the width h of the front electrode E1 to the size h of the pixel, and thus has a reduction effect of approximately 63 to 67%.

That is, in the PDP according to the present invention, the aperture ratio increases as the projection area of the front electrode E1 decreases, so that the light emitted from the discharge space is emitted more to the outside, thereby improving the luminance of light emitted. For example, h = 4b in the conventional example is the opening ratio of the PDP which was ^{((4b) 2 -4b 2)} / (4b) 75% to ^{2, ((4b) 2 -2.54b} 2) / (4b) described above ^It becomes ^{2, and it} becomes about 84%, and the opening ratio shows the remarkable improvement more than 12%.

The improvement of the aperture ratio and the improvement of the luminous luminance according to the present invention are more pronounced when the auxiliary electrode E3 is arranged between the front electrode E1, that is, the scan electrode, as shown in FIG.

The auxiliary electrode E3 of FIG. 5 extends in parallel with the front electrode E1 on an extension line of the center of the opposite adjacent side of the partition B, where the width of the auxiliary electrode E3 is also the width b of the front electrode E1. A), the aperture ratio of the present invention is ((4b) ² -2.54 × 2 × b ² ) / (4b) ² , while the conventional aperture ratio is lowered to only 50% in the above example of h = 4b. This becomes about 68%, which shows a large aperture ratio improvement of 36.5% or more and thus an improvement in luminous luminance.

The embodiment of FIG. 5 also has the basic feature of the present invention in that the partition B and the electrodes E1 to E3 are configured to cross in an inclined direction, but the front electrode E1 and the auxiliary electrode E3 are The back electrode E2 is arranged in the longitudinal direction in the transverse direction of the substrate (P1, P2 in FIG. 1) so that the partition B extends in the inclined direction. This means that the pixels are arranged in a rhombus shape, and this is to facilitate the connection and driving of an external circuit by arranging the electrodes E1 to E3 in a matrix form while exhibiting an aperture ratio improving effect which is a basic feature of the present invention.

Meanwhile, in this embodiment, the transverse electrodes E1 and E2 are divided into the front electrode E1 and the auxiliary electrode E3, but according to the driving, both the electrodes E1 and E3 serve as the scan electrode and the auxiliary electrode. It can work alternately. For example, when the front electrode E1 arranged on the same pixel serves as a scan electrode, the lower auxiliary electrode E3 becomes an auxiliary electrode causing sustain discharge, and the lower auxiliary electrode E3 becomes a scan electrode. In this case, the upper front electrode E1 may serve as an auxiliary electrode. That is, the front electrode E1 and the auxiliary electrode E3 are merely for convenience, and both can serve as scan electrodes and auxiliary electrodes depending on the driving method.

Another advantage of such a configuration is that when addressing with the inclined front electrode E1, adjacent pixels are not positioned directly on the top, left, or right, but adjacent to each other, so that even if there are gaps or holes in the partition B, the cross It is very unlikely that torque will be generated, and even if crosstalk is generated, the visual quality of the user's visual perception will not be degraded because it is not immediately adjacent to the upper, lower, left, or right pixels.

As described above, according to the present invention, while maintaining the discharge intensity, the projected area of the front electrode can be greatly reduced, and this effect is more pronounced when the auxiliary electrode is arranged on the front electrode side. In addition, according to the present invention, crosstalk between pixels can be effectively prevented.

Claims (5)

In a plasma display device in which a front electrode and a back electrode are disposed on a front substrate and a back substrate so as to be divided into a grid-shaped partition wall to form a plurality of pixels, the front electrode and the rear electrode are orthogonal to each other, and the diagonal direction of the partition wall is respectively. And a center line of the front electrode is positioned on an extension line between the centers of two adjacent sides of the partition wall. The plasma display device of claim 1, wherein the back electrode extends diagonally of the partition wall while being perpendicular to the front electrode. 2. The plasma display device according to claim 1, wherein an auxiliary electrode parallel to the front electrode is provided on an extension line between centers of opposite adjacent sides of the partition wall. The plasma display device according to any one of claims 1 to 3, wherein the partition wall extends in the longitudinal direction and the transverse direction of the front substrate and the rear substrate. The plasma display device according to any one of claims 1 to 2 or 3, wherein the front electrode and the back electrode extend in the longitudinal direction and the transverse direction of the front substrate and the back substrate.