JP2010027489A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a boundary between a display region and a region outside the display region of a plasma display panel inconspicuous so as to prevent affecting the images due to the boundary. <P>SOLUTION: Inside a display region, an X-electrode, including an X-bus electrode 10 and an X-discharge electrode 11 and a Y-electrode, including a Y-bus electrode 20 and a Y-discharge electrode 21 are arranged opposite to each other. In a region outside the display region, a Y-electrode lead wire 22 is extended in the same direction as the Y-electrode in a range d. In the range d, a boundary between the display region and the region outside the display region can be kept inconspicuous, by increasing the width of the Y-electrode leader wire 22 so that an area ratio of a metal electrode becomes equal to an area ratio of the metal electrode in the display region. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device, and more particularly to a plasma display panel in which a boundary between a display area and a non-display area is inconspicuous.

  A demand for a PDP display device using a plasma display panel (PDP) is increasing as a thin display capable of displaying a particularly large screen. The PDP display device includes a plasma display panel, a front panel disposed on the front surface of the plasma display panel, a drive circuit disposed on the back surface of the plasma display panel, and a frame that accommodates these.

  The front panel functions as an antireflection film, emission of electromagnetic waves, a color filter for adjusting the color tone of an image, and the like, and is generally formed of glass. The plasma display panel is configured by superimposing a front substrate on which scan electrodes, discharge sustaining electrodes and the like are formed, and a rear substrate on which address electrodes and the like are formed.

  In the front substrate, in order to apply a voltage from the outside to the scanning electrode or the discharge sustaining electrode, a terminal portion is formed at the end of the substrate, and an electrode lead line connecting the terminal portion and the scanning electrode or the discharge sustaining electrode is provided. Is formed. In the front substrate, a voltage is supplied to the scan electrode from, for example, a terminal portion on the left side of the screen, and to the discharge sustain electrode, for example, from the right side of the screen. Therefore, the density of the electrodes is different between the display area and its periphery.

  In general, only the display area of the plasma display panel can be visually recognized by the frame of the frame, but the effect of the alignment accuracy of the plasma display panel and the front panel, the effect of light refraction from the front panel, or When the screen is viewed obliquely, the outside of the display area of the plasma display panel may be seen. The outside of the display area affects the impression of the screen because reflection from the outside is different from the display area.

  “Patent Document 1” describes a configuration in which a black band can be seen on both sides of a screen by increasing the width of a scanning electrode or a discharge sustaining electrode outside the display area of the front substrate.

Japanese Patent Laid-Open No. 62-194225

  The plasma display panel described in “Patent Document 1” is intended to form black bands on both sides of a display region. For this purpose, it is taught that the width of the scan electrodes or the discharge sustain electrodes is widened so that the distance between the scan electrodes or between the discharge sustain electrodes is minimized.

  However, in applications such as a TV using a plasma display panel, there is a problem that the screen is uncomfortable if the boundary between the display area and the non-display area is clear as described in “Patent Document 1”. In other words, in a TV using a plasma display panel, the frame around the display area is not always visible like a CRT, but the display area can be viewed from an angle or by refraction of light from the front panel. The surrounding area may or may not be visible.

  In such a case, if the contrast due to reflection or the like is clearly different between the display area and the non-display area, the screen is uncomfortable. An object of the present invention is to realize a display device using a plasma display panel in which a difference between a display area and a non-display area is not noticeable.

  In the front panel, the ratio of the area occupied by the metal electrode is set to be approximately the same in the display area and the non-display area so that the boundary between the display area and the non-display area cannot be visually recognized. Specific means are as follows.

  (1) On the front substrate, a first bus electrode including a first bus electrode and a first discharge electrode extends in a first direction, and faces the first electrode, so that a second bus electrode And the second electrode including the second discharge electrode extends in the first direction, the first electrode and the second electrode form an electrode pair, and the electrode pair is in the second direction. A display area arranged outside the display area and a display outside area outside the display area, and a terminal section for supplying current to the first electrode and the terminal section on the first side of the display non-display area And a first lead line for connecting the first electrode to the first electrode, and a second portion of the non-display area has a terminal portion for supplying a current to the second electrode and a current to the second electrode. A second lead line is formed, a third electrode extending in the second direction is formed on the rear substrate, and the front substrate and the rear substrate are A plasma display panel sealed by a screen portion, wherein the ratio of the area occupied by the first electrode and the second electrode in the display region is A, and the first region of the non-display region is the first side. When the area occupied by the first electrode lead lines within a specific distance from the display area is B, the B is in the range of 60% to 140% of the A, and the second area of the non-display area is on the second side. When the area occupied by the second electrode lead lines within a specific distance from the display area is C, the C is in the range of 60% to 140% of the A, and the specific distance is 2 mm or more. Plasma display panel.

  (2) The plasma display panel according to (1), wherein B and C are 70% to 100% of A.

  (3) The plasma display panel according to (1) or (2), wherein a width of the first lead line or the second lead line is larger than a width of the first bus electrode.

  (5) The plasma display panel according to (1) or (2), wherein the first lead line or the second lead line is branched into a plurality.

  (6) On the front substrate, a first bus electrode including a first bus electrode and a first discharge electrode extends in a first direction, and faces the first electrode, so that a second bus electrode And the second electrode including the second discharge electrode extends in the first direction, the first electrode and the second electrode form an electrode pair, and the electrode pair is in the second direction. A display region extending in the first direction between the pair of electrodes, the fourth electrode being insulated from the first electrode and the second electrode; There is a non-display area outside the display area, and the first side of the non-display area is connected to a terminal portion for supplying current to the first electrode, the terminal portion, and the first electrode. A first lead line is formed, and a terminal portion for supplying current to the second electrode and a current to the second electrode are provided on the second side of the non-display area. In the plasma display panel, two lead lines are formed, a third electrode extending in the second direction is formed on the rear substrate, and the front substrate and the rear substrate are sealed by a seal portion. The fourth electrode extends on the first side of the non-display area within a specific distance from the display area of the non-display area, and on the second side of the non-display area, The fourth electrode extends within a specific distance from the display area of the non-display area, and the area occupied by the first electrode, the second electrode, and the fourth electrode in the display area When the ratio is A, and the area occupied by the first electrode lead line and the fourth electrode within a specific distance from the display area on the first side of the non-display area is B, the B is the 60% to 140% of A When the area occupied by the second electrode lead line and the fourth electrode within a specific distance from the display area on the second side of the non-display area is C, the C is the A The plasma display panel according to any one of claims 60 to 140%, wherein the specific distance is 2 mm or more.

  (7) The plasma display panel according to (6), wherein B and C are 70% to 100% of A.

  (8) The plasma display panel according to (6) or (7), wherein the width of the first lead line or the second lead line is larger than the width of the first bus electrode.

  (9) The plasma display panel according to (6) or (7), wherein the first lead line or the second lead line is branched into a plurality.

  (10) A first electrode including a first bus electrode formed of metal and a first discharge electrode formed of a transparent conductive film extends in a first direction on the front substrate, and the first electrode A second electrode including a second bus electrode formed of a metal and a second discharge electrode formed of a transparent electrode extends in a first direction so as to face the first electrode, and the first electrode The electrode and the second electrode form an electrode pair, and the electrode pair has a display area arranged in the second direction, and a non-display area outside the display area. On the first side, a terminal part for supplying current to the first electrode, a first lead line connecting the terminal part and the first electrode are formed, and the second side of the outside display area Includes a terminal section for supplying current to the second electrode and a second lead line for supplying current to the second electrode. A plasma display panel formed on the rear substrate, the third electrode extending in the second direction is formed, and the front substrate and the rear substrate are sealed by a seal portion, the display region A ratio of the area occupied by the first bus electrode and the second bus electrode in A is A, and the first electrode lead line occupies within a specific distance from the display area on the first side of the non-display area. When the area is B, the B is in the range of 60% to 140% of the A, and the second electrode lead line within the specific distance from the display area on the second side of the non-display area. When the area occupied is C, C is in the range of 60% to 140% of A, and the specific distance is 2 mm or more.

  (11) A first electrode including a first bus electrode formed of metal and a first discharge electrode formed of a transparent conductive film extends in a first direction on the front substrate, and the first electrode A second electrode including a second bus electrode formed of metal and a second discharge electrode formed of a transparent conductive film extends in a first direction so as to face the first electrode, and the second electrode 1 electrode and the second electrode form an electrode pair, the electrode pair is arranged in a second direction, and between the electrode pair, the first electrode and the second electrode Has a display area in which an insulated fourth electrode extends in the first direction, and a non-display area outside the display area. On the first side of the non-display area, A terminal portion for supplying current to the first electrode, a first lead line connecting the terminal portion and the first electrode are formed, A terminal portion for supplying current to the second electrode and a second lead line for supplying current to the second electrode are formed on the second side of the non-display area. 3 is a plasma display panel in which a third electrode extending in the direction of 2 is formed, and the front substrate and the rear substrate are sealed by a seal portion, The fourth electrode extends within a specific distance from the display area of the non-display area, and the second side of the non-display area has a specific distance from the display area of the non-display area. The fourth electrode extends, and the ratio of the area occupied by the first bus electrode, the second bus electrode, and the fourth electrode in the display area is A, and the first area of the outside display area is the first area. The first within a specific distance from the display area on the side of When the area occupied by the electrode lead line and the fourth electrode is B, the B is in the range of 60% to 140% of the A, and is specified from the display area on the second side of the non-display area. When the area occupied by the second electrode lead line and the fourth electrode within the distance is C, the C is in the range of 60% to 140% of the A, and the specific distance is 2 mm or more. A plasma display panel characterized by

  The boundary between the display area and the non-display area is made smooth by preventing the ratio of the area occupied by the metal electrode from changing to the ratio of the area occupied by the metal electrode in the display area. And the boundary cannot be seen. Thereby, it is possible to prevent the boundary between the display area and the non-display area from affecting the image.

  Before describing specific embodiments of the present invention, the structure of a plasma display panel to which the present invention is applied will be described. FIG. 1 is an exploded perspective view of a display area of a plasma display panel. The plasma display panel is composed of two glass substrates, a front substrate 1 and a back substrate 2. On the front substrate 1, scanning electrodes and discharge sustaining electrodes for generating a discharge for image formation are arranged in parallel.

  The scan electrode further includes a scan discharge electrode formed of ITO (Indium Tin Oxide) that actually becomes a discharge electrode, and a scan bus electrode that supplies a voltage from a terminal portion. Hereinafter, the scan bus electrode is referred to as an X bus electrode 10, and the scan discharge electrode is referred to as an X discharge electrode 11. Further, the X electrode includes the X bus electrode 10 and the X discharge electrode 11.

  The discharge sustaining electrode further includes a discharge sustaining electrode formed of ITO (Indium Tin Oxide) that actually becomes the discharge electrode, and a discharge sustaining bus electrode that supplies a voltage from the terminal portion. Hereinafter, the discharge sustain bus electrode is referred to as Y bus electrode 20, and the discharge sustain electrode is referred to as Y discharge electrode 21. The Y electrode includes the Y bus electrode 20 and the Y discharge electrode 21.

  Each of the X bus electrode 10 and the Y bus electrode 20 has a laminated structure of metal, and has a laminated structure of chromium, copper, and chromium from the front substrate 1 side. Chromium formed on the front substrate 1 has excellent adhesion to glass, and has a black surface, which has an effect of improving contrast. Copper is used to reduce the resistance of the bus electrode. The chromium is further coated on the copper, but this chromium prevents the resistance of the copper surface from being changed due to oxidation.

  The chromium on the front glass may further have a laminated structure of chromium oxide and chromium. Since the chromium oxide is black and has a smaller reflectance than the chromium, the contrast of the image can be further improved. Chromium oxide also has excellent adhesion to glass. Moreover, since the contact surface with copper is chromium, copper is not oxidized.

  In FIG. 1, the discharge electrode uses ITO, which is a transparent conductive film, and the bus electrode uses a metal laminated film having a low resistance. This is because when the transparent conductive film is used, more light emitted from the phosphor 8 can be extracted outside. On the other hand, the discharge electrode may be formed of the same metal as the bus electrode. In this case, the process is completed once and the manufacturing cost is greatly reduced. In the embodiment described below, a case where the discharge electrode and the bus electrode are formed of the same metal will be mainly described as an example.

  Dielectric layer 5 is formed so as to cover the X electrode and the Y electrode. For the dielectric layer 5, a low-melting glass having a softening point of about 500 ° C. is used. A protective film 6 is formed thereon. The protective film 6 is mainly made of magnesium oxide (MgO) and is formed by sputtering or vapor deposition.

  An address electrode 40 is formed on the rear substrate 2 orthogonal to the X bus electrode 10 or the Y bus electrode 20. The structure of the address electrode 40 is the same as that of the X bus electrode 10 or the Y bus electrode 20, and is a laminated structure of chromium, copper, and chromium. The dielectric layer 5 covers the address electrode 40. Generally, the same material as that of the dielectric layer 5 formed on the front substrate 1 is used for the dielectric layer 5 formed on the rear substrate 2.

  On the dielectric layer 5 of the back substrate 2, the partition wall 7 is formed to extend in the same direction as the address electrode 40 so as to sandwich the address electrode 40. A phosphor 8 is applied to the inside of the partition wall 7. The phosphor 8 is applied in parallel with the recesses formed by the partition walls 7 of FIG.

  A space surrounded by the front substrate 1, the rear substrate 2, and the partition walls 7 is a discharge space for enclosing a discharge gas. A space between the pair of bus wirings and the partition wall 7 corresponds to one display cell (subpixel), and in the case of color display, three subpixels correspond to three primary colors (R, B, G), and one pixel ( Pixel).

  The principle of light emission of the plasma display panel is as follows. First, a voltage (discharge start voltage) of about 100 to 200 V is applied between the address electrode 40 corresponding to the cell to emit light and the scan electrode corresponding to the cell. Since the address electrode 40 and the bus electrode are orthogonal, a single cell at the intersection can be selected. In the selected cell, a weak discharge is generated between the discharge electrode to which a voltage is applied (in this case, the X electrode) and the address electrode 40, and a charge is formed on the protective film 6 on the dielectric layer 5 on the front substrate 1 side. (Wall charge) is accumulated. In this way, writing by charges is performed on all cells in the display area. This period is a writing period, and no image is formed.

  Subsequently, in the sustain period, a high frequency pulse is applied between the X electrode and the Y electrode to perform a sustain discharge. At this time, the sustain discharge is generated only in the cells in which the wall charges are accumulated. Ultraviolet rays are generated by the sustain discharge, and the phosphor 8 emits light by the ultraviolet rays. Visible light emitted from the phosphor 8 is emitted from the front substrate 1 and is visually recognized by a human. Since the phosphor 8 emits light only in the cells in which charges are accumulated during the writing period, an image is formed.

  FIG. 2 is a plan view of the plasma display panel. In FIG. 2, the back substrate 2 is disposed under the front substrate 1 with a sealing material 3 interposed therebetween. On the rear substrate 2, address electrodes 40 indicated by dotted lines extend in the vertical direction and are arranged in the horizontal direction. An address signal is supplied to the address electrode 40 from the back substrate 2 terminal portion 120.

  In FIG. 2, an X electrode and a Y electrode extend in the lateral direction on the front substrate 1. A signal is supplied to the X electrode from the left side of the front substrate 1, which is not shown in FIG. A signal is supplied from the terminal portion 110 of the right front substrate 1 to the Y electrode. The terminal portion 110 and the Y electrode are connected by a Y bus electrode lead line 22. Since the pitch of the terminal portions 110 is smaller than the pitch of the Y bus electrodes 20, the Y bus electrode lead lines 22 have inclined portions 221 in the outside display area.

  The Y bus electrode lead line 22 extends in the horizontal direction until reaching the inclined portion 221. Outside the display area, the pitch of the lead lines is the same as the pitch of the Y bus electrode 20, but since there is no X electrode in this portion, the occupation density of the metal electrodes on the glass substrate is Less than half. The X electrode or the Y electrode is chromium or chromium oxide on the front substrate 1 side, and is black. Therefore, the display area appears black and the non-display area appears white at the boundary of the display area. This makes the screen feel uncomfortable.

  FIG. 3 is an enlarged view showing a state of the X electrode or the Y electrode in the conventional example in the vicinity of the display region boundary portion of FIG. In FIG. 3, the X bus electrode 10 and the X discharge electrode 11 are simultaneously formed of the same material. The Y bus electrode 20 and the Y discharge electrode 21 are simultaneously formed of the same material. In FIG. 3, the X electrode terminates in the display area, the Y electrode extends to the outside display area, and then is inclined and wired toward the terminal. As shown in FIG. 3, in the conventional example, the area occupied by the metal electrode in the non-display area is very small compared to the display area. On the other hand, if the area occupied by the metal electrode is excessively increased in the non-display area, the reflection in the display area and the reflection in the non-display area are greatly different, and the screen is uncomfortable.

  The outside display area is covered with the frame of the frame, so the outside display area of the plasma display panel is set to be invisible, but the misalignment between the frame and the plasma display panel, the front of the plasma display panel A non-display area of the plasma display panel is visually recognized when light is refracted on the installed front panel or when the screen is viewed from an oblique direction.

  The range in which the non-display area is visually recognized is the range d shown in FIG. 2, but d is about 2 mm. Therefore, it is desirable that the occupied area of the metal wiring does not change greatly in the range of at least 2 mm from the boundary of the display area. In FIG. 2, for example, if the X electrode is extended to the outside display area, the range of d, the difference in reflectance between the display area and the outside display area is not recognized.

  However, in such a configuration, discharge occurs between the extended portion of the X electrode and the Y electrode in the outside display area. Since the phosphor 8 is formed by printing, it is applied slightly larger than the display area, and the phosphor 8 is also present in the extended portion of the X electrode. Then, the phosphor 8 emits light even in the portion where the X electrode extends. Since this light emission is not related to the image, the image quality is impaired.

  There are two types of arrangement of the X electrode and the Y electrode. One of them is to alternately arrange X electrodes and Y electrodes in the vertical direction as shown in FIG. The wiring of FIG. 4 is the same as the wiring of the X electrode and the Y electrode shown in FIG. This wiring has an advantage that the wiring is simple because the X electrodes and the Y electrodes are alternately arranged in the vertical direction. The other one is a wiring method as shown in FIG. Features of the wiring method shown in FIG. 10 will be described later.

  Examples 1 to 4 are examples in which the X electrode and the Y electrode are arranged as shown in FIG. FIG. 4 shows an example in which the X bus electrode 10 and the X discharge electrode 11 are formed of the same material and in the same process. Also in Example 1 to Example 4, the electrode configuration is the same as in FIG. This electrode configuration has a feature that the manufacturing cost can be reduced because the electrode can be formed by a single process.

  On the other hand, the electrode structure as shown in FIG. 4 has a problem that the visible light emitted from the phosphor 8 is blocked by the metal electrode, and the light emitted to the outside is reduced. FIG. 5 shows an electrode configuration that counters this problem. In FIG. 5, the X bus electrode 10 and the Y bus electrode 20 are formed of a metal laminated film. The X discharge electrode 11 and the Y discharge electrode 21 that cause discharge in the cell are formed of ITO, which is a transparent electrode.

  Visible light from the phosphor 8 due to ultraviolet rays generated by the discharge between the X discharge electrode 11 and the Y discharge electrode 21 can be taken out through the ITO. Therefore, the screen brightness can be increased. In FIG. 5, ITO is first deposited and patterned, and then a three-layer metal film constituting the bus electrode is deposited thereon, and the bus electrode is patterned. To do.

  In the following embodiment, as the electrode structure, a type in which the bus electrode and the discharge electrode are simultaneously formed by the same metal laminated film as shown in FIG. 4 will be described. However, the discharge electrode is formed of ITO as shown in FIG. The present invention can also be applied to a type in which the bus electrode is formed of a metal laminated film. However, when the discharge electrode as shown in FIG. 5 is formed of a transparent electrode, the area occupied by the metal electrode in the front substrate 1 refers only to the area of the bus electrode.

  In the embodiment described below, a specific wiring configuration on the front substrate 1 for making the boundary between the display area and the non-display area inconspicuous is shown.

  FIG. 6 is a plan view showing the shapes of the X and Y electrodes and the lead lines of the Y electrode at the display region boundary portion of the front substrate 1 according to the first embodiment of the present invention. In FIG. 6, the X electrode and the Y electrode are arranged to face each other in the display area. A discharge occurs between the X discharge electrode 11 and the Y discharge electrode 21 made of metal, and light is generated from the corresponding phosphor 8. In the figure, a pair of opposing discharge electrodes corresponds to each cell.

  In FIG. 6, a leader line is displayed only on the Y electrode. Although the lead line of the X electrode exists in the left direction of FIG. 6, it is not shown in FIG. In FIG. 6, the Y electrode lead line 22 extends in the same direction as the Y electrode by a predetermined distance d, and then bends to become an inclined portion 221. The inclined portion 221 is formed because the pitch of the terminal portions is smaller than the pitch of the Y electrodes.

  In FIG. 6, the Y electrode lead line 22 is larger than the width of the Y bus electrode 20 in the display area in the range of distance d from the display area. That is, the area occupied by the metal film is increased in the non-display area as compared with FIG. 3 showing the conventional example. If the occupied area of the metal film does not change greatly between the display area and the non-display area, the boundary between the display area and the non-display area becomes unclear and the image does not feel strange.

  A dotted vertical rectangle shown in the display area of FIG. 3 which is a conventional example is a range corresponding to a cell. In this cell, the area occupied by the metal wiring is 33.3%. In addition, the area occupied by the metal wiring in the vertically long dotted rectangle shown in the non-display area in FIG. 3 is 12.5%. That is, the area occupied by the metal film in the non-display area is only 37.5% of the area occupied by the metal film in the display area. In this case, the non-display area appears white.

  In FIG. 6 showing the present embodiment, in the range d of the non-display area, the thickness of the Y electrode lead line 22 is increased to increase the area occupied by the metal wiring. In the example of FIG. 6, the ratio of the area occupied by the metal wiring in the non-display area is 33.3%. Since the occupied area of the metal wiring in the display area is 33.3%, the occupied area of the metal wiring is the same in the display area and the non-display area. Therefore, in the example of FIG. 6, when the screen is viewed from the outside, the boundary between the display area and the non-display area can hardly be recognized.

  When the front panel and the plasma display panel are aligned, the refraction of the front panel, or the area outside the display when the screen is viewed obliquely is about 2 mm, the Y electrode lead line 22 is thickened in the display outside area. It is sufficient that the range to be 2 mm or more from the boundary of the display area.

  In this embodiment, if the Y electrode lead line 22 is made too thick, the non-display area becomes black, the boundary between the display area and the non-display area stands out, and the image is uncomfortable. When the occupation area ratio of the metal wiring in the display area is A and the occupation area ratio of the metal wiring in the non-display area is B, according to sensory evaluation, B / A needs to be in the range of 0.6 to 1.4. There is. Moreover, More preferably, it is the range of 0.7-1.0. This is because the boundary between the display area and the non-display area may be more noticeable when the non-display area is blacker than the display area.

  FIG. 7 is a plan view showing a second embodiment of the present invention. Since the structure of the display area is the same as that in FIG. In the non-display area of FIG. 7, the Y electrode lead line 22 branches into three lines at a distance d. In this range, the area occupied by the metal wiring in the display area and the non-display area can be matched by increasing the area of the Y electrode lead line 22 by branching the Y electrode lead line 22 into three.

  In FIG. 7, a vertically long rectangle with a dotted line in the display area corresponds to the display cell. The occupied area of the metal wiring in this portion is, for example, 33.3%. Further, the dotted rectangle in the non-display area in FIG. 7 is an area corresponding to the display cell in the display area, and the area occupied by the metal wiring in this portion is 33.3%. Therefore, in the configuration of FIG. 7, when the screen is viewed from the outside, the boundary between the display area and the non-display area is hardly visible.

  In FIG. 7, since the Y electrode lead line 22 is branched in the range d in the outside display area, there is an advantage that the metal wiring can be more uniformly distributed. In FIG. 7, the Y electrode lead-out line 22 is branched into three, but it may be branched into two, or may be branched into four or more. Further, the range of d is the same as that of the first embodiment and is 2 mm or more.

  The ratio of the metal wiring occupation ratio in the display area to the metal wiring occupation ratio in the non-display area is the same as that in the first embodiment. That is, when the occupation area ratio of the metal wiring in the display area is A and the occupation area ratio of the metal wiring in the non-display area is B, B / A needs to be in the range of 0.6 to 1.4. Moreover, More preferably, it is the range of 0.7-1.0.

  In FIG. 7, the Y electrode lead line 22 is branched into three. However, as long as the above conditions are satisfied, the branch line not connected to the inclined portion 221 or the terminal portion is not necessarily connected to the Y electrode. There is no need.

  FIG. 8 is a plan view showing a third embodiment of the present invention. In the display region of FIG. 8, the X electrode and the Y electrode extend in the horizontal direction and are arranged in the vertical direction. A display cell is formed at a portion where the X discharge electrode 11 and the Y discharge electrode 21 face each other. That is, discharge occurs in this portion, and visible light is emitted from the phosphor 8.

  In FIG. 8, a float electrode 30 is formed between the Y electrode and the X electrode. The float electrode 30 is not connected to either the X electrode or the Y electrode and is literally floated, and does not affect the withstand voltage between the X electrode and the Y electrode. The float electrode 30 is formed of the same material as the X electrode or the Y electrode, and is formed simultaneously.

  Therefore, the float electrode 30 has a laminated structure of metal, and the portion in contact with the front substrate 1 is chromium or chromium oxide. Chrome or chromium oxide is black, and therefore the float electrode 30 has a so-called black matrix effect, and improves the contrast of the image in the display area.

  In this embodiment, as shown in FIG. 8, the float electrode 30 extends to the outside display area, and the width is increased in the outside display area. As a result, the area occupied by the metal electrode is increased in the range d of the non-display area. In the display area of FIG. 8, a portion surrounded by a dotted vertical rectangle forms one cell. This cell includes an X electrode, a Y electrode, and a float electrode 30.

  The area occupancy ratio of the metal electrode in the dotted rectangle of the display area in FIG. 8 is, for example, 45.8%. 8 is a portion corresponding to the dotted vertical rectangle in the display area. The area occupation ratio of the metal electrode in this portion in the non-display area is set to 45.8% by increasing the width of the float electrode 30. Therefore, according to the configuration of the present embodiment, the boundary between the display area and the non-display area is hardly visible from the outside.

  In the outside display area, the range d for increasing the width of the float electrode 30 is 2 mm or more, as in the first embodiment. Further, the ratio of the occupation ratio of the metal wiring in the display area to the occupation ratio of the metal wiring in the non-display area is the same as in the first embodiment. That is, when the occupation area ratio of the metal wiring in the display area is A and the occupation area ratio of the metal wiring in the non-display area is B, B / A needs to be in the range of 0.6 to 1.4. Moreover, More preferably, it is the range of 0.7-1.0.

  In the above description, the boundary between the display area and the non-display area is made inconspicuous by increasing the width of the float electrode 30 in the non-display area. Depending on the convenience of electrode arrangement in the non-display area, the width of the Y electrode may be changed simultaneously with changing the line width of the float electrode 30.

  FIG. 9 is a plan view showing a fourth embodiment of the present invention. Since the configuration of the display area is the same as that in FIG. In the non-display area of FIG. 9, the float electrode 30 is branched into three lines in the range d. In this range, the area occupied by the metal wiring in the display area and the non-display area can be matched by increasing the area of the float electrode 30 by branching the float electrode 30 into three.

  In FIG. 9, a vertically long dotted rectangle in the display area corresponds to the display cell. The occupied area of the metal wiring in this portion is, for example, 45.8%. 9 is an area corresponding to the display cell in the display area. The area occupied by the metal wiring in this part is also reduced by forming three float electrodes 30. In FIG. 8%. Therefore, in the configuration of FIG. 9, when the screen is viewed from the outside, the boundary between the display area and the non-display area is hardly visible.

  In FIG. 9, since the float electrode 30 is branched in the range d in the non-display area, there is an advantage that the metal wiring can be more uniformly distributed. In FIG. 9, the float electrode 30 is branched into three, but it may be branched into two, or may be branched into four or more. Further, the range of d is 2 mm or more as in the first embodiment. The branched float electrodes 30 do not need to be connected to each other. This is because the branched float electrode 30 only needs to have a role of increasing the area occupied by the metal electrode.

  The ratio of the metal wiring occupation ratio in the display area and the metal wiring occupation ratio in the non-display area is the same as that in the first embodiment. That is, when the occupation area ratio of the metal wiring in the display area is A and the occupation area ratio of the metal wiring in the non-display area is B, B / A needs to be in the range of 0.6 to 1.4. Moreover, More preferably, it is the range of 0.7-1.0.

  Examples 5 to 8 differ from Examples 1 to 4 in the arrangement of X electrodes and Y electrodes. As for the electrode arrangement in the display area of Examples 1 to 4, the X electrodes and the Y electrodes are alternately arranged in order as shown in FIG. On the other hand, in the electrode arrangement in the display areas of Examples 5 to 8, every other vertical relationship between the X electrode and the Y electrode is switched as shown in FIG. Such an arrangement has the following advantages.

  In the operation of the plasma display panel, a pulse voltage of about 180 V is alternately applied to the X electrode and the Y electrode during a period for displaying an image, that is, a light emission period (sustain period). This voltage causes a discharge between the X electrode and the Y electrode, and visible light is emitted from the phosphor 8 by the generated ultraviolet rays to form an image.

  In FIG. 4, among the pulses applied to the X electrode or the Y electrode, for example, the voltage between the X1 electrode and the Y1 electrode, or the voltage between the X2 electrode and the Y2 electrode contributes to the discharge, causing the phosphor 8 to shine and image. Contributes to formation. However, the voltage between the Y1 electrode and the X2 electrode or between the Y2 electrode and the X3 electrode does not cause discharge, does not cause the phosphor 8 to emit light, and does not contribute to image formation. However, since capacitance exists between the Y1 electrode and the X2 electrode or between the Y2 electrode and the X3 electrode, a current flows between these electrodes. Most of this current is reactive current, but when current flows, power is consumed in the wiring resistance, and wasteful power is consumed.

  FIG. 10 shows an electrode arrangement that counters this problem. In FIG. 10, the X electrode and the Y electrode extend in the horizontal direction, and discharge is generated between the X electrode and the Y electrode, as in FIG. However, in FIG. 10, the vertical relationship between the X electrode and the Y electrode is switched for each pair of the X electrode and the Y electrode. For example, it is assumed that discharge is generated between the Y2 electrode and the X2 electrode at the same time as the discharge is generated at the X1 electrode and the Y1 electrode. In this case, since the Y1 electrode and the Y2 electrode that are vertically adjacent to each other have the same potential, no current flows even if a capacitance exists between the Y1 electrode and the Y2 electrode. Therefore, useless current flowing between the Y1 electrode and the Y2 electrode can be eliminated. This is the same between the X2 electrode and the X3 electrode. As described above, the electrode arrangement as shown in FIG. 10 makes the wiring slightly complicated, but wasteful power consumption can be eliminated.

  FIG. 10 shows the case where the discharge electrode and the bus electrode are formed of the same metal laminated film. FIG. 11 shows an electrode arrangement in which the discharge electrode is formed of ITO, which is a transparent electrode, and more visible light emitted from the phosphor 8 in the cell can be extracted. Also in this case, the arrangement of the X electrode and the Y electrode can be the same as in FIG. In the following embodiment, the case where the discharge electrode and the bus electrode are formed of the same metal laminated film as shown in FIG. 10 will be described, but the present invention is similarly applied to the case of the electrode configuration as shown in FIG. I can do it. However, when the discharge electrode is formed of a transparent electrode as shown in FIG. 11, the area occupied by the metal electrode on the front substrate 1 refers only to the area of the bus electrode.

  FIG. 12 shows the electrode arrangement in the vicinity of the display area boundary in the conventional example when the electrode arrangement is as shown in FIG. In FIG. 12, an X electrode and a Y electrode extend inside the display area, and a Y electrode lead line 22 extends from the Y electrode in the outside display area. In the display area of FIG. 12, a vertically long dotted rectangle corresponds to a display cell. For example, the area occupied by the metal electrode in the display cell is 33.3%. On the other hand, the occupied area of the metal electrode in the vertically elongated rectangular portion of the corresponding dotted line in the non-display area is 12.5%. Therefore, in the example of FIG. 12, the boundary between the display area and the non-display area becomes clear, and the user feels uncomfortable when viewing the screen.

  FIG. 13 is a plan view showing this embodiment. In FIG. 13, the display area has the same electrode arrangement as described in FIG. The configurations of the X electrode and the Y electrode are the same as in Example 1 and the like, and have a laminated structure of chromium, copper, chromium, or chromium oxide, chromium, copper, chromium. In the non-display area in FIG. 13, the Y electrode lead line 22 extends. The Y electrode lead line 22 has a larger width in the area d in the outside display area, and increases the area occupancy of the metal electrode in the outside display area, making it difficult to visually recognize the boundary between the display area and the display outside area. is doing.

  In FIG. 13, dotted vertical rectangles in the display area correspond to display cells. The area occupancy ratio of the metal electrode in the vertically long dotted rectangle in the display area is, for example, 33.3%. On the other hand, in the range d of the outside display area, the width of the Y electrode lead line 22 is large, so that the area occupation ratio of the metal electrode is 33.3%. Therefore, the boundary between the display area and the non-display area is difficult to visually recognize from the outside, and this boundary does not affect the image. The range d in the outside display area is 2 mm or more.

  Also in the present embodiment, the ratio of the occupancy ratio of the metal wiring in the display area to the occupancy ratio of the metal wiring in the non-display area is the same as in the first embodiment. That is, when the occupation area ratio of the metal wiring in the display area is A and the occupation area ratio of the metal wiring in the non-display area is B, B / A needs to be in the range of 0.6 to 1.4. Moreover, More preferably, it is the range of 0.7-1.0.

  FIG. 14 is a plan view showing a sixth embodiment of the present invention. In FIG. 14, the display area is the same as in FIG. In the non-display area of FIG. 14, the Y electrode lead line 22 branches into three lines in the range d. This is to increase the area ratio of the metal electrode in the outside display area.

  In FIG. 14, the dotted rectangle in the display area corresponds to the display cell. The area occupancy ratio of the metal electrode in the vertically long dotted rectangle in the display area is, for example, 33.3%. On the other hand, in the non-display area range d, since three Y electrode lead lines 22 are formed, the area occupied by the electrode is large, and the area occupation ratio of the metal electrode is 33.3%. Therefore, the boundary between the display area and the non-display area is hardly visible from the outside, and this boundary does not affect the image. The range d in the outside display area is 2 mm or more.

  Also in the present embodiment, the ratio of the occupancy ratio of the metal wiring in the display area to the occupancy ratio of the metal wiring in the non-display area is the same as in the first embodiment. That is, when the occupation area ratio of the metal wiring in the display area is A and the occupation area ratio of the metal wiring in the non-display area is B, B / A needs to be in the range of 0.6 to 1.4. Moreover, More preferably, it is the range of 0.7-1.0.

  In the present embodiment, since the Y electrode lead line 22 is branched into three, the metal electrode portion can be uniformly arranged in the range d of the non-display area, and the display area and the non-display area The boundary can be made smoother, making it difficult to see the boundary portion.

  In FIG. 14, the Y electrode lead line 22 is branched into three. However, as long as the above conditions are satisfied, the branch line not connected to the inclined portion 221 or the terminal portion is not necessarily connected to the Y electrode. There is no need.

  FIG. 15 is a plan view showing a seventh embodiment of the present invention. In FIG. 15, in the display region, a float electrode 30 is disposed between the Y electrode and the Y electrode or between the X electrode and the X electrode. The role of the float electrode 30 is to improve the contrast of the image as described in the third embodiment. In the range d in the non-display area in FIG. 15, the width of the float electrode 30 is increased every other line. This is because the interval between the Y electrode lead lines 22 is increased every other line, and the width of the float electrode 30 in the portion where the interval is large is increased.

  In FIG. 15, dotted vertical rectangles in the display area correspond to display cells. The area occupancy of the metal electrode in the vertically long rectangular rectangle in the display area is, for example, 45.8%. On the other hand, in the range d of the non-display area, the width of the Y electrode lead line 22 is large, so the area occupation ratio of the metal electrode is 45.8%. Therefore, the boundary between the display area and the non-display area is hardly visible from the outside, and this boundary does not affect the image. The range d in the outside display area is 2 mm or more.

  Also in the present embodiment, the ratio of the occupancy ratio of the metal wiring in the display area to the occupancy ratio of the metal wiring in the non-display area is the same as in the first embodiment. That is, when the occupation area ratio of the metal wiring in the display area is A and the occupation area ratio of the metal wiring in the non-display area is B, B / A needs to be in the range of 0.6 to 1.4. Moreover, More preferably, it is the range of 0.7-1.0.

  FIG. 16 is a plan view showing an eighth embodiment of the present invention. In FIG. 16, in the display region, a float electrode 30 is arranged between the Y electrode and the Y electrode or between the X electrode and the X electrode. The role of the float electrode 30 is to improve the contrast of the image as described in the third embodiment. In the non-display area of FIG. 16, in the range d, the float electrodes 30 are branched into three every other line. The interval between the Y electrode lead lines 22 is increased every other line, and the float electrode 30 in a portion where the interval is large is branched into three to increase the occupied area ratio of the metal electrode. In FIG. 16, the branched float electrode 30 does not necessarily have to be continuous.

  In FIG. 16, dotted vertical rectangles in the display area correspond to display cells. The area occupancy of the metal electrode in the vertically long rectangular rectangle in the display area is, for example, 45.8%. On the other hand, in the area d of the outside display area, the float electrode 30 is branched and the area is large, so that the area occupation ratio of the metal electrode is 45.8%. Therefore, the boundary between the display area and the non-display area is difficult to visually recognize from the outside, and this boundary does not affect the image. The range d in the outside display area is 2 mm or more.

  Also in the present embodiment, the ratio of the occupancy ratio of the metal wiring in the display area to the occupancy ratio of the metal wiring in the non-display area is the same as in the first embodiment. That is, when the occupation area ratio of the metal wiring in the display area is A and the occupation area ratio of the metal wiring in the non-display area is B, B / A needs to be in the range of 0.6 to 1.4. Moreover, More preferably, it is the range of 0.7-1.0.

  The relationship between the Y electrode and the Y electrode lead line 22 on the left side of the front substrate 1 in FIG. 2 has been described above. In FIG. 2, an X electrode lead line and a terminal portion (not shown) are formed on the left side of the front substrate 1. Also on the left side of the display area in FIG. 2, if the reflectance or the like is greatly different between the display area and the non-display area, the screen is uncomfortable as with the right side of the screen. Therefore, the contents described above can be similarly applied to the X electrode lead line on the left side of FIG.

It is a cross-sectional perspective view of the display area of a plasma display panel. It is a top view of a plasma display panel. It is a top view of the electrode near the display area of a front panel. It is a top view of electrode arrangement | positioning in a display area. It is a top view of the other electrode structure in FIG. 2 is a plan view of an electrode configuration of Example 1. FIG. 6 is a plan view of an electrode configuration of Example 2. FIG. 6 is a plan view of an electrode configuration of Example 3. FIG. 6 is a plan view of an electrode configuration of Example 4. FIG. It is a top view of other electrode arrangement in a display field. It is a top view of the other electrode structure in FIG. It is a prior art example of the electrode arrangement | positioning of FIG. 10 is a plan view of an electrode configuration of Example 5. FIG. 6 is a plan view of an electrode configuration of Example 6. FIG. 10 is a plan view of an electrode configuration of Example 7. FIG. 10 is a plan view of an electrode configuration of Example 8. FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Front substrate, 2 ... Back substrate, 3 ... Seal part, 5 ... Dielectric layer, 6 ... Protective film, 7 ... Partition, 8 ... Phosphor, 10 ... X bus electrode, 11 ... X discharge electrode, 20 ... Y bus electrode, 21 ... Y discharge electrode, 22 ... Y electrode lead wire, 30 ... Float electrode, 40 .. Address electrode 110... Front substrate terminal portion 120. Rear substrate terminal portion 221... Y electrode lead wire inclined portion.

Claims (10)

On the front substrate, a first electrode including a first bus electrode and a first discharge electrode extends in a first direction, and faces the first electrode so as to face the second bus electrode and the second electrode. A second electrode including a plurality of discharge electrodes extends in the first direction, the first electrode and the second electrode form an electrode pair, and the electrode pair is arranged in the second direction. A display area and an outside display area outside the display area,
On the first side of the non-display area, a terminal portion for supplying current to the first electrode, and a first lead line connecting the terminal portion and the first electrode are formed,
On the second side of the outside display area, a terminal portion for supplying current to the second electrode and a second lead line for supplying current to the second electrode are formed,
The back substrate is a plasma display panel in which third electrodes extending in the second direction and arranged in the first direction are formed, and the front substrate and the back substrate are sealed by a seal portion. And
A ratio of the area occupied by the first electrode and the second electrode in the display region is A, and the first electrode lead line within the specific distance from the display region on the first side of the non-display region When the area occupied is B, the B is in the range of 60% to 140% of the A,
When the area occupied by the second electrode lead line within a specific distance from the display area on the second side of the non-display area is C, the C ranges from 60% to 140% of the A;
The plasma display panel according to claim 1, wherein the specific distance is 2 mm or more.   The plasma display panel according to claim 1, wherein B and C are 70% to 100% of A.   3. The plasma display panel according to claim 1, wherein a width of the first lead line or the second lead line is larger than a width of the first bus electrode. 4.   3. The plasma display panel according to claim 1, wherein the first lead line or the second lead line is branched into a plurality. On the front substrate, a first electrode including a first bus electrode and a first discharge electrode extends in a first direction, and faces the first electrode so as to face the second bus electrode and the second electrode. A second electrode including a plurality of discharge electrodes extends in the first direction, the first electrode and the second electrode form an electrode pair, and the electrode pair is arranged in the second direction. And
Between the electrode pair, a display region in which a fourth electrode insulated from the first electrode and the second electrode extends in the first direction, and an outer side of the display region There is a non-display area,
On the first side of the non-display area, a terminal portion for supplying current to the first electrode, and a first lead line connecting the terminal portion and the first electrode are formed,
On the second side of the outside display area, a terminal portion for supplying current to the second electrode and a second lead line for supplying current to the second electrode are formed,
The rear substrate is a plasma display panel in which a third electrode extending in the second direction is formed, and the front substrate and the rear substrate are sealed by a seal portion,
The fourth electrode extends on the first side of the non-display area within a specific distance from the display area of the non-display area,
The fourth electrode extends on the second side of the non-display area within a specific distance from the display area of the non-display area,
A ratio of the area occupied by the first electrode, the second electrode, and the fourth electrode in the display area is A, and the display area is within a specific distance from the display area on the first side of the non-display area. When the area occupied by the first electrode lead wire and the fourth electrode is B, the B is in the range of 60% to 140% of the A;
When the area occupied by the second electrode lead line and the fourth electrode within a specific distance from the display area on the second side of the non-display area is C, the C is from 60% of the A. 140% range,
The plasma display panel according to claim 1, wherein the specific distance is 2 mm or more.   6. The plasma display panel according to claim 5, wherein B and C are 70% to 100% of A.   7. The plasma display panel according to claim 5, wherein a width of the first lead line or the second lead line is larger than a width of the first bus electrode.   The plasma display panel according to claim 5, wherein the first lead line or the second lead line is branched into a plurality. A first electrode including a first bus electrode formed of metal and a first discharge electrode formed of a transparent conductive film extends in a first direction on the front substrate, and the first electrode includes Oppositely, a second bus electrode including a second bus electrode formed of metal and a second discharge electrode formed of a transparent electrode extends in a first direction, and the first electrode The second electrode forms an electrode pair, and the electrode pair has a display area arranged in a second direction, and a non-display area outside the display area;
On the first side of the non-display area, a terminal portion for supplying current to the first electrode, and a first lead line connecting the terminal portion and the first electrode are formed,
On the second side of the outside display area, a terminal portion for supplying current to the second electrode and a second lead line for supplying current to the second electrode are formed,
The rear substrate is a plasma display panel in which a third electrode extending in the second direction is formed, and the front substrate and the rear substrate are sealed by a seal portion,
The ratio of the area occupied by the first bus electrode and the second bus electrode in the display region is A, and the first electrode lead out within a specific distance from the display region on the first side of the non-display region When the area occupied by the line is B, the B is in the range of 60% to 140% of the A,
When the area occupied by the second electrode lead line within a specific distance from the display area on the second side of the non-display area is C, the C ranges from 60% to 140% of A. ,
The plasma display panel according to claim 1, wherein the specific distance is 2 mm or more. A first electrode including a first bus electrode formed of metal and a first discharge electrode formed of a transparent conductive film extends in a first direction on the front substrate, and the first electrode Oppositely, a second bus electrode including a second bus electrode formed of metal and a second discharge electrode formed of a transparent conductive film extends in a first direction, and the first electrode And the second electrode forms an electrode pair, and the electrode pair is arranged in a second direction,
Between the electrode pair, a display region in which a fourth electrode insulated from the first electrode and the second electrode extends in the first direction, and an outer side of the display region There is a non-display area,
On the first side of the non-display area, a terminal portion for supplying current to the first electrode, and a first lead line connecting the terminal portion and the first electrode are formed,
On the second side of the outside display area, a terminal portion for supplying current to the second electrode and a second lead line for supplying current to the second electrode are formed,
The rear substrate is a plasma display panel in which a third electrode extending in the second direction is formed, and the front substrate and the rear substrate are sealed by a seal portion,
The fourth electrode extends on the first side of the non-display area within a specific distance from the display area of the non-display area,
The fourth electrode extends on the second side of the non-display area within a specific distance from the display area of the non-display area,
The ratio of the area occupied by the first bus electrode, the second bus electrode, and the fourth electrode in the display area is A, and within a specific distance from the display area on the first side of the outside display area When the area occupied by the first electrode lead wire and the fourth electrode in B is B, the B is in the range of 60% to 140% of the A;
When the area occupied by the second electrode lead line and the fourth electrode within a specific distance from the display area on the second side of the non-display area is C, the C is from 60% of the A. 140% range,
The plasma display panel according to claim 1, wherein the specific distance is 2 mm or more.

Images