JP2993571B2 - Discharge display device - Google Patents

Description

The present invention relates to a discharge display device such as a plasma display having a third electrode.

(Prior Art) A conventional technique will be described for a plasma display having at least one third electrode. For example, 640x4
As shown in FIG. 3, the structure of the first panel of the 80-dot matrix plasma display is made of a material such as gold, aluminum, nickel, etc.
An electrode 2 is provided, and this third electrode 2 is covered with a dielectric layer 3. The cathode electrode 4 is formed on the surface of the dielectric layer 3. FIG. 4 shows a planar structure of the cathode electrode 4. The cathode electrode 4 is composed of 480 display electrodes.
On the front glass 7, a light-transmitting anode electrode 6 and a partition wall 5 are formed. The third electrode 2, the dielectric layer 3, the cathode electrode 4 formed on the rear glass 1, and the partition wall 5 formed on the front glass 7 are made by screen printing. The front glass 7 and the rear glass 1 are connected to the cathode electrode 4
And the anode electrode 6 are overlapped so as to be orthogonal.
A space is kept between the cathode electrode 4 and the anode electrode 6 by the partition wall 5, and a Ne + Ar (1%) mixed gas is sealed in the space. Second, the driving method is performed with an applied voltage waveform and timing as shown in FIG. Vsyn
c (vertical synchronization signal) and Hsync (horizontal synchronization signal) are signals from which the timing of each waveform is generated. Numbers such as 1H and 2H indicate the time width of the HORIZONTAL (horizontal) conductor, and the time widths do not always match in each waveform. The cathode electrodes D1 to D480 shown in FIG. 4 are selected by the potential of the anode electrode 6 at the timing when the potential of each cathode electrode shown in FIG.
In the panel having the third electrode 2, the third electrode 2 is-
At the timing of 170 V, discharge occurs at the third electrode 2 and / or one or both of the cathode electrode 4 and the anode electrode 6. (Hereinafter, the discharge at this timing is referred to as a regenerating discharge). Since the third electrode 2 is covered with the dielectric layer 3 as shown in the structure of the panel in FIG. 3, the discharge time is short at this time, and a positive charge is stored on the surface of the dielectric layer 3. In the section where the third electrode 2 is at 180 V, when the potentials of the cathode electrodes D _{1 to} D ₄₈₀ are sequentially changed to 0 V at the timing shown in FIG. 5, the third electrode 2 and the cathode electrode D ₁
Between D and ₄₈₀ , a discharge occurs with the positive charges on the surface of the dielectric layer 3 as priming ions (this discharge is hereinafter referred to as an auxiliary discharge). Since the third electrode 2 is covered with the dielectric layer 3, the auxiliary discharge time is short. This auxiliary discharge is
Since it occurs right next to the display discharge, the lighting voltage of the display discharge is reduced by the priming effect. In addition, since the reproduction discharge and the auxiliary discharge are completed in a very short time, the light emission is extremely weak as compared with the light emission by the display discharge, and a display quality with a high contrast ratio can be obtained.

(SUMMARY invention) However, in the structure of a plasma display having the above structure, near the cathode electrodes D ₁ positive charges of the other dielectric layer 3 surface beside and D ₄₈₀ cathode electrode D ₂ to D ₄₇₉ in order greater than the positive charge of the dielectric layer 3 surface, the auxiliary discharge in the cathode electrodes D ₁ and D ₄₈₀ is brighter than the other auxiliary discharge, there is a problem that lowering the image quality of the plasma display.

The present invention is, above mentioned, the lower part of the auxiliary discharge cathode electrodes D ₁ of the upper and the cathode electrode D ₄₈₀ is the solution to brighter problems by other auxiliary discharge, as a display,
An object of the present invention is to provide a discharge display device such as a plasma display having excellent image quality.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and includes a plurality of first electrodes which are spaced apart from each other in a first direction; A plurality of second electrodes spaced apart and arranged in a second direction orthogonal to the first direction, the plurality of first electrodes and the plurality of second electrodes Is located on the opposite side to the side facing the third electrode, and is disposed on the plurality of second electrodes via a dielectric.
And a dummy electrode adjacent to the outermost second electrode of the plurality of second electrodes and arranged along the second direction. On the other hand, a predetermined potential is always applied.

(Operation) As described above, according to the present invention, since the dummy electrode which is always at the predetermined potential level is provided, the positive charge stored during the regenerating discharge is cut off on the dielectric surface outside the dummy electrode, and the auxiliary discharge is performed. Therefore, the brightness of the auxiliary discharge of each cathode can be made equal. Also, close to the dummy electrode (located at the end of the cathode)
Since the cathode is covered with the opaque body, it is possible to eliminate variations in brightness in the auxiliary discharge of the cathode located at the end.

(Embodiment) FIG. 1 is a plan view for explaining one embodiment of a cathode electrode structure of the present invention, and FIG. 2 is a timing waveform diagram of each electrode of a plasma display. Will be explained.

FIG. 3 shows a basic sectional structure of the plasma display panel. In FIG. 3, a third electrode 2 made of gold, aluminum, or nickel is formed on a surface of the rear glass 1 corresponding to the cathode electrode 4 as the second electrode and the anode electrode 6 as the first electrode. A dielectric layer 3 is formed so as to cover the third electrode 2, and a cathode electrode 4 having a planar structure as shown in FIG. 1 is formed of nickel.
On the front glass 7, between the translucent anode electrodes 6
The third electrode 2, the dielectric layer 3, the cathode electrode 4, and the partition 5, which form the partition 5 having a height of about 200 μm, are made by screen printing. The front glass 7 and the back glass 1 are overlapped so that the anode electrode 6 and the cathode electrode 4 are orthogonal to each other. At this time, in FIG. 1, the dummy electrodes A1, A2 of the cathode electrode and the reset electrodes R1,
The anode electrode corresponding to R2 is coated with an opaque glass paste, and the dummy electrodes A1 and A2 and the reset electrodes R1 and R2 cannot be seen from the front. The distance between the anode electrode and the cathode electrode is kept at about 200 (μm) by partition walls,
A Ne + Ar (1%) mixed gas is sealed in the space.

Although the first electrode is an anode electrode and the second electrode is a cathode electrode, the first electrode may be a cathode electrode and the second electrode may be an anode electrode.

FIG. 2 shows potential and timing waveforms for driving the cathode electrode structure and the panel structure shown in FIG. 1 and FIG. The dummy electrodes A1 and A2 of the cathode electrode are always kept at a potential of 62V. Cathode reset electrodes R ₁ , R
No. ₂ has no corresponding anode electrode and is not visible from the front of the panel and does not participate in display discharge. Reset electrode R ₁ , R ₂
Is the respective timings as with the cathode electrode D ₁ to D ₄₈₀ as shown in FIG. 2, potential indicates a change. In FIG. 2, a positive charge is stored on the dielectric surface by a regenerating discharge that occurs at the timing when the third electrode becomes -170 V. Dielectric layer surface and in the prior art D ₁ of the upper portion of the cathode electrode structure shown in FIG. 4 (outside), the amount of charge accumulated on the dielectric layer surface of the lower (outer) of D _480, the surface There often for large compared to the dielectric layer surface between the cathode electrode D ₁ of the D _480. In the auxiliary discharge the third electrode of the second view occurs at a timing which is 180 V, the positive charge on the dielectric surface near the cathode electrodes D ₁ and D ₄₈₀ is the cathode electrode D ₂ to D
For more than positive charges of the dielectric surface near the _479, the auxiliary discharge cathode electrodes D ₁ and D ₄₈₀ is the cathode electrode
Brighter than the auxiliary discharge D ₂ to D _479. In the planar structure of the cathode electrode of the present invention shown in FIG. 1, the cathode electrodes D ₁ upper (outer) to the dummy electrodes A ₁ and the reset electrode
R ₁ and R ₂ exist. Therefore, the dielectric surface to a positive charge stored during playback discharge above the dummy electrode A ₁ (outside) is shielded by the 62V potential of the dummy electrodes A _1,
It is not used for the auxiliary discharge of the reset electrodes R ₁ and R _{2, and} the auxiliary discharge of the display cathode electrode D _{1 is} an auxiliary discharge having the same weak level of brightness as D _{2 to} D ₄₇₉ . Similarly, because of the presence of the dummy electrodes A ₂ to the lower (outer) of D _480, positive charges accumulated in the dummy electrodes A ₂ at the lower portion of the dielectric surface to regeneration discharge is shielded by the 62V potential of the dummy electrodes A _2, no longer used for auxiliary discharge of D _480, the auxiliary discharge the same level brightness and D ₂ to D _479.

Further, according to the embodiment of the present invention, the reset electrodes R ₁ , R ₂
The reset electrodes R ₁ and R ₂ are coated with an opaque glass paste so that they cannot be seen from the front even if the shielding of the positive charges stored on the dielectric surface varies during the regenerating discharge by the dummy electrode A ₁ since it is, the variation of the auxiliary discharge is transparent, will be only the same brightness level of the auxiliary discharge in the cathode electrodes D ₁ to D ₄₈₀ is visible,
Good image quality can be obtained.

In the embodiment of the present invention, _two dummy electrodes A ₁ and A ₂ are provided, and two reset electrodes R ₁ and R ₂ are provided. It goes without saying that the dummy electrode or the reset electrode can be removed as necessary.

(Effects of the Invention) As described above in detail, according to the present invention, in the discharge display device,
Since a dummy electrode provided with a predetermined potential level is provided,
During the regenerating discharge, the positive charge stored on the dielectric surface outside the cathode / anode electrodes can be cut off to a predetermined amount. Therefore, light emission of the auxiliary discharge by the first cathode electrode / anode electrode or the last cathode electrode / anode electrode can be made weak light emission. In addition, since the reset electrode is provided, the positive charges on the dielectric surface are shielded and consumed similarly to other cathode electrodes, and the brightness of the auxiliary discharge by each cathode electrode can be made uniform. Therefore, the image quality of the discharge display device can be improved. Can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a cathode electrode structure for explaining an embodiment of the present invention, FIG. 2 is a waveform diagram of the potential and timing of each electrode shown in FIG. 1, and FIG. 3 is a plasma display panel. FIG. 4 is a plan view of a cathode electrode structure of a conventional plasma display, and FIG. 5 is a waveform diagram of the potential and timing of each electrode shown in FIG. 1 ... back glass, 2 ... third electrode, 3 ... dielectric layer,
4 ...... cathode (cross section), 5 ...... partition wall, 6 ...... anode electrode, 7 ...... front glass, D ₁ to D ₄₈₀ ...... cathode electrode (plane), A1, A2 ...... dummy electrode, R1, R2 ...... Reset electrode

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-17928 (JP, A) JP-A-60-230698 (JP, A) Real-life opening Sho-62-191050 (JP, U) (58) Field (Int.Cl. ⁶ , DB name) H01J 17 / 49,17 / 04 H01J 11 / 00,11 / 02

Claims (4)

(57) [Claims] A plurality of first electrodes arranged in the first direction and spaced apart from each other in a first direction; and a second electrode arranged in a distance from the plurality of first electrodes and orthogonal to the first direction. A plurality of second electrodes spaced apart from each other in a direction, and the plurality of first electrodes and the plurality of second electrodes are located on opposite sides to a side facing the plurality of second electrodes, and A third electrode disposed via a second electrode and a dielectric, and a second electrode positioned at an outermost position among the plurality of second electrodes.
And a dummy electrode disposed adjacent to the first electrode and along the second direction, wherein a predetermined potential is always applied to the dummy electrode. 2. The discharge display device according to claim 1, wherein said dummy electrodes are arranged on both sides of said plurality of second electrodes. 3. The discharge display device according to claim 1, further comprising an opaque body that blocks a discharge generated from the predetermined plurality of second electrodes from view. 4. The discharge display device according to claim 1, wherein said plurality of first electrodes and said plurality of second electrodes are an anode and a cathode, respectively, or a cathode and an anode, respectively.