JP2005251642A - Display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display panel reducing manufacturing cost. <P>SOLUTION: In the display panel in which a front glass substrate and a back glass substrate face each other in parallel, row electrodes are formed on the front glass substrate, and the column electrodes are formed on the back glass substrate, column electrodes D1 formed on the back glass substrate 10 are formed on the surface opposite to the surface facing the front glass substrate of the back glass substrate 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a configuration of a display panel.

  In a display panel, like a plasma display panel (PDP) or a liquid crystal panel, two substrates each having a plurality of electrodes extending in a strip shape are arranged in parallel so that the respective electrodes are orthogonal to each other. There is a flat display panel which forms an image by applying a voltage to the crossing portions of the electrodes facing each other.

  For example, as shown in FIGS. 1 and 2, the PDP has a plurality of row electrode pairs (X, Y) each having a pair of row electrodes X and Y extending in the row direction on the inner surface side of the front glass substrate 1. Is formed, and this row electrode pair (X, Y) is covered with the dielectric layer 2 and the protective layer 3, and the row electrode is respectively provided on the inner surface of the rear glass substrate 4 facing the front glass substrate 1. A column electrode D constituting the discharge cell C is formed in the discharge space S at a position extending in a direction orthogonal to the pair (X, Y) and intersecting the row electrode pair (X, Y). The structure covered with the column electrode protective layer 5 is provided.

  1 and 2, reference numeral 6 denotes a partition wall formed on the column electrode protective layer 5 and partitions the discharge space S for each discharge cell C. Reference numeral 7 denotes the inside of the discharge cell C partitioned by the partition wall 6. The red, green, and blue phosphor layers respectively formed on the column electrode protective layer 5.

  The PDP selectively generates an address discharge between the row electrode Y and the column electrode D intersecting each other, and forms a portion of the dielectric layer 2 facing the discharge cell C where the address discharge is performed. In the discharge cell C (light emitting cell) in which the wall charges are formed, a sustain discharge is generated between the row electrodes X and Y of the row electrode pair (X, Y) to form the phosphor layer 7. An image is formed by emitting light (see, for example, Patent Document 1).

  Such a display panel in which electrodes for image formation are formed on two substrates facing each other has the following problems.

  That is, the conventional display panel having the above-described configuration protects the electrodes formed on the substrate from damage when the structure constituting the display panel is formed on the substrate in the manufacturing process. There is a problem that a manufacturing cost increases due to necessity, an apparatus for that purpose, and an increase in manufacturing steps.

  For example, in the PDP as shown in FIGS. 1 and 2, when the partition wall 6 is further formed by sandblasting or the like on the inner surface side of the rear glass substrate 4 on which the column electrode D is formed, D and the terminal portion for electrical connection of the column electrode D must be protected so as not to be damaged. For this purpose, the column electrode protective layer is formed so as to cover the column electrode D on the back glass substrate 4. 5 is formed, and the partition wall 6 and the phosphor layer 7 are formed on the column electrode protective layer 5, and in the manufacturing process, an apparatus and a process for forming the column electrode protective layer 5 Is needed.

  In recent years, as a method for forming a partition wall for partitioning the discharge space of PDP, a method of directly processing the surface of a glass substrate has been proposed. However, on a glass substrate subjected to such processing, In the case of forming an electrode on the substrate, there arises a new problem such as disconnection of the electrode due to a step of the processed surface of the glass substrate.

JP 2003-22756 A

  An object of the present invention is to solve the problems in the manufacturing process of the display panel as described above.

  In order to achieve the above object, the display panel according to the present invention (the invention according to claim 1) has two substrates facing each other in parallel, and each of the image forming electrodes in a direction intersecting with the two substrates. In the display panel, one of the image forming electrodes formed on one of the two substrates is opposed to the other of the one substrate. It is characterized in that it is formed on a surface opposite to the surface on which it is present.

  In the present invention, row electrodes are formed on the inner surface side of the front substrate located on the display surface side of the display panel, and a column electrode for forming an image by applying a voltage between the row electrodes of the front substrate is provided. The display panel formed on the surface opposite to the surface facing the front substrate of the rear substrate disposed in parallel with the front substrate is the best embodiment.

  According to the display panel according to this embodiment, for example, another structure (for example, a discharge space in the case of a PDP or a liquid crystal in the case of a liquid crystal panel is injected on the surface of the back substrate facing the front substrate. In the process of forming other structures, the column electrode is formed on the surface of the rear substrate opposite to the side facing the front substrate. There is no risk of damaging the column electrodes formed on the back substrate in the process, and measures such as the formation of a protective layer for protecting the column electrodes and their connection terminals, which were necessary in the past, are unnecessary. Even when the column electrode is formed after the structure is formed, there is no possibility that the column electrode is disconnected at the time of the formation, thereby simplifying the manufacturing process of the plasma display panel and shortening the process time. It is possible to reduce the manufacturing cost by.

  The first example of the embodiment of the display panel according to the present invention will be described below.

  In the following, an embodiment in which the present invention is applied to a PDP will be described. However, the present invention can also be applied to other display panels such as a liquid crystal panel except for a structure part peculiar to the PDP.

  FIG. 3 is a cross-sectional view showing the configuration on the back glass substrate side of the two glass substrates (see FIG. 2) constituting the PDP in the first embodiment of the present invention.

  In FIG. 3, partition walls 11 having a predetermined pattern (for example, a lattice shape or a stripe shape) are formed on the surface of the rear glass substrate 10 facing the front glass substrate (not shown) (the upper surface in FIG. 3). In addition, phosphor layers 12 that are color-coded red, green, and blue are formed between the partition walls 11 in order.

  The column electrode D1 is a portion between the barrier ribs 11 on the back surface (lower surface in FIG. 3) opposite to the surface on which the barrier ribs 11 and the phosphor layers 12 of the rear glass substrate 10 are formed. At a position facing each (the portion where each phosphor layer 12 is formed), it extends in the column direction (perpendicular to the paper surface) and is arranged in parallel in the row direction (parallel to the paper surface) at equal intervals. It is formed as follows.

  FIG. 3 shows an example in which the insulating layer 13 is formed on the back side of the back glass substrate 10 and the column electrode D1 is covered, but the column electrode D1 is insulated by other means. In some cases, the insulating layer 13 is not necessarily formed.

  The insulating layer 13 is formed by protecting the column electrode D1 from being scratched or adhering impurities during transport in the manufacturing process of the PDP, or applying a voltage to the column electrode D1 after the panel is completed. This is to cut off electromagnetic waves and heat radiation generated when applied.

  The insulating layer 13 is also formed for the purpose of protecting the column electrode D1 from corrosion caused by water vapor or the like contained in the outside air.

  The insulating layer 13 also has a function of reinforcing the strength when the back glass substrate 10 is thinned in order to adjust the dielectric constant, the dielectric capacitance, and the like.

  FIG. 4 is a process diagram showing a procedure for forming column electrodes on the rear glass substrate.

  Hereinafter, the column electrode forming process will be described with reference to FIG.

  First, in FIG. 4A, the rear glass substrate 10 on which the column electrodes are formed has a dielectric constant and a dielectric capacity adjusted in advance by the composition and thickness of the glass material, or to optimize the display performance of the panel. In addition, a glass substrate is prepared in which the dielectric constant and dielectric capacitance are known, and pigments are added in consideration of optical reflectance (transmittance) and the like.

  Then, as shown in FIG. 4B, the electrode metal film M1 is formed on the back surface of the back glass substrate 10 by a technique such as sputtering with the back side facing upward.

  Next, as shown in FIG. 4C, the electrode metal film M1 formed on the back glass substrate 10 is aligned in the column direction (perpendicular to the paper surface) by a technique such as etching or masking. It is shaped so as to form column electrodes D1 of a predetermined pattern that extend and are arranged in parallel in the row direction (parallel to the paper surface) at equal intervals.

  After the column electrode D1 is formed on the back glass substrate 10 in this way, as shown in FIG. 4D, the back glass substrate 10 is inverted so that the back surface side faces downward.

  Thereafter, as shown in FIG. 4 (e), the paste is applied on the inner surface of the rear glass substrate 10 facing upward (the surface opposite to the surface on which the column electrode D1 is formed) or a dry film. The partition wall paste film L is formed by a method such as pasting.

  Then, as shown in FIG. 4 (f), the barrier rib paste film L is formed into a barrier rib shape having a required pattern by a technique such as sandblasting, and then a process such as formation of a phosphor layer (not shown) is performed. .

  As described above, in the display panel according to the first embodiment, the column electrode D1 is formed on the back surface of the back glass substrate 10 opposite to the side on which the partition walls 11 and the phosphor layers 12 are formed. A protective layer for preventing the column electrode D1 from being damaged when the partition wall 11 is molded by a method such as sand blasting, or for example, than a non-working material for protecting the connection terminal portion of the column electrode D1. Since it is not necessary to install a protective plate with high hardness in the sandblasting device or to form a separate protective layer, the number of manufacturing steps of the PDP can be reduced, and the column electrode D1 is used. Since the apparatus for forming the protective layer is not necessary, the process time and the manufacturing cost can be reduced.

  FIG. 5 is a sectional view showing a second example of the embodiment of the display panel according to the present invention.

  In the following, as in the case of the first embodiment, an embodiment in which the present invention is applied to a PDP will be described. However, except for a structure part peculiar to the PDP, other liquid crystal panels and the like will be described. The present invention can also be applied to a display panel.

  In FIG. 5, the back glass substrate 20 is integrally formed with irregularities on the surface of the back glass substrate 20 when the back glass substrate 20 is formed on the surface (the upper surface in FIG. 5) facing the front glass substrate (not shown). By cutting the surface of the rear glass substrate 20 by sandblasting or the like, the partition walls 20B having a predetermined pattern (for example, a lattice shape or a stripe shape) are formed integrally with the glass substrate body 20A. The phosphor layers 21 that are color-coded red, green, and blue are sequentially arranged between the partition walls 20B.

  The column electrode D2 is a portion between the partition walls 20B on the back surface (the lower surface in FIG. 5) opposite to the surface on which the partition walls 20B and the phosphor layer 21 are formed. At a position facing each (the portion where each phosphor layer 21 is formed), it extends in the column direction (perpendicular to the paper surface) and is arranged in parallel in the row direction (parallel to the paper surface) at equal intervals. It is formed as follows.

  FIG. 5 shows an example in which the insulating layer 22 is formed on the back side of the back glass substrate 20 and the column electrode D2 is covered, but the column electrode D2 is insulated by other means. In some cases, the insulating layer 22 is not necessarily formed.

  The insulating film 22 is formed because the column electrode D2 is protected from scratches or impurities attached during transportation in the manufacturing process of the PDP, and the voltage is applied to the column electrode D2 after the panel is completed. This is to block electromagnetic waves, heat dissipation, etc. generated when applied, or to prevent corrosion of the column electrode D2.

  Further, as will be described later, the insulating layer 22 also has a function of reinforcing the strength when the glass substrate body 20A is thinned in order to adjust the dielectric constant, the dielectric capacitance, and the like.

  FIG. 6 is a process diagram showing a procedure for forming column electrodes on the rear glass substrate.

  Hereinafter, the column electrode forming process will be described with reference to FIG.

  First, in FIG. 6 (a), as described above, the surface on the side facing the front glass substrate is previously molded with irregularities on the surface of the glass plate at the time of molding, or the surface of the glass plate. Is cut by sandblasting or the like to prepare a rear glass substrate 20 in which partition walls 20B having a predetermined pattern such as a lattice or stripe are integrally formed on the glass substrate body 20A. It is placed with 20B facing down.

  In the rear glass substrate 20, a pigment or the like is added to a glass material in consideration of optical reflectance (transmittance) and the like, and the glass substrate body 20A has a dielectric constant and a dielectric capacitance depending on the composition and thickness of the glass material. Is adjusted, or the dielectric constant and dielectric capacity thereof are grasped in order to optimize the display performance of the panel.

  As shown in FIG. 6B, an electrode metal film M2 is formed on the back glass substrate 20 facing upward by a technique such as sputtering.

  Next, as shown in FIG. 6C, the electrode metal film M2 formed on the back glass substrate 20 is aligned in the column direction (perpendicular to the paper surface) by a technique such as etching or masking. It is shaped so as to form column electrodes D2 having a predetermined pattern that extend and are arranged in parallel in the row direction (parallel to the paper surface) at equal intervals.

  After the column electrode D2 is formed on the back glass substrate 20 in this way, as shown in FIG. 6D, the back glass substrate 20 is inverted so that the back side thereof faces downward.

  Thereafter, a step of forming a phosphor layer (not shown) between the partition walls 20B of the rear glass substrate 20 is performed.

  As described above, in the display panel according to the second embodiment, when the column electrode is formed on the rear glass substrate in the PDP having the rear glass substrate on which the barrier ribs are integrally formed, the partition 20B of the rear glass substrate 20 Since the column electrode D2 is formed on the back surface opposite to the formed side, there is no possibility that the column electrode D2 is disconnected due to the unevenness of the partition wall 20B as in the prior art, and the reliability of the PDP is improved. I can do it.

  Furthermore, since it is not necessary to protect the column electrode and its connection terminal portion from damage in the process of forming other structures such as phosphor layers, the number of steps of the PDP manufacturing process can be reduced, and the manufacturing apparatus can also be used. As a result, the process time can be shortened and the manufacturing cost can be reduced.

  Further, even when the partition wall is formed by cutting the glass plate by sandblasting after the column electrode is formed, the column electrode D2 is formed on the surface opposite to the side on which the partition wall 20B of the glass substrate body 20A is formed. There is no need to particularly form a protective layer or the like for protecting the column electrode D2 from damage, the manufacturing apparatus is simplified, and the process time and manufacturing cost can be reduced.

It is a front view which shows an example of a structure of the conventional display panel. It is sectional drawing in the WW line of FIG. It is sectional drawing which shows 1st Example of this invention. It is process explanatory drawing which shows the manufacturing process of the 1st Example. It is sectional drawing which shows 2nd Example of this invention. It is process explanatory drawing which shows the manufacturing process of the 2nd Example.

Explanation of symbols

10 ... rear glass substrate (one substrate, rear substrate)
DESCRIPTION OF SYMBOLS 11 ... Partition 12 ... Phosphor layer 13 ... Insulating layer 20 ... Back glass substrate (one substrate, back substrate)
20A: Glass substrate body 20B: Partition wall 21: Phosphor layer 22: Insulating layer D1, D2: Column electrodes (electrodes for image formation)
L: Septum paste film M1, M2 ... Electrode metal film

Claims (7)

In a display panel in which two substrates are opposed in parallel and image forming electrodes are formed in directions intersecting each other on the two substrates,
One of the image forming electrodes formed on one of the two substrates is formed on a surface opposite to the surface of the one substrate facing the other substrate. Display panel characterized by being made.   The said one board | substrate is a back substrate located in the back side which is a non-display surface side of a display panel, The said one electrode for image formation is formed in the back side of this back substrate. Display panel.   The display panel according to claim 2, wherein the one image forming electrode is covered with an insulating layer formed on the back side of the back substrate.   The surface of the one substrate facing the other substrate is formed with a partition wall that partitions the space between the two substrates, and the one image forming electrode is formed with the partition wall of the one substrate. The display panel of Claim 1 currently formed in the surface on the opposite side.   The display panel according to claim 4, wherein the partition wall is integrally formed on a surface of one substrate facing the other substrate.   The display panel is a plasma display panel, the one substrate is a rear substrate located on the rear side which is the non-display surface side, and the other substrate is located on the front side which is the display surface side A row electrode extending in the row direction is formed on the back side of the front substrate, and extends in the column direction on a surface opposite to the side facing the front substrate of the back substrate arranged in parallel with the front substrate. The display panel according to claim 1, wherein column electrodes are formed.   The display panel according to claim 1, wherein the display panel is a liquid crystal display panel.

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