JP3904730B2 - Electrode pattern inspection device for plasma display panel - Google Patents

Electrode pattern inspection device for plasma display panel Download PDF

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Publication number
JP3904730B2
JP3904730B2 JP19071098A JP19071098A JP3904730B2 JP 3904730 B2 JP3904730 B2 JP 3904730B2 JP 19071098 A JP19071098 A JP 19071098A JP 19071098 A JP19071098 A JP 19071098A JP 3904730 B2 JP3904730 B2 JP 3904730B2
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Prior art keywords
electrode pattern
pdp
display panel
plasma display
line camera
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JP19071098A
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Japanese (ja)
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JP2000018929A5 (en
JP2000018929A (en
Inventor
博司 上口
達也 青木
和宏 出口
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株式会社ソキア
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Description

【0001】
【発明の属する技術分野】
本発明は、例えばネオンガスを挟んで対向するプラズマディスプレイパネル(以下、PDPという場合がある)の電極パターンを画像処理により検査する装置に関する。
【0002】
【従来の技術】
PDPは表面に複数本の電極が形成されているが、該電極は相互に平行な表示部と該表示部の少なくとも一端に形成された略放射状の端子部とから構成されている。また、1つのプラズマディスプレイは2枚のPDPを所定間隔を存して対向させ、且つ両PDP間に例えばネオンガスを封入することにより構成されている。該2枚のPDPは相互に同一のものではなく、各々の表示部のパターンが相互に直交する方向になっていなければならない。
【0003】
一方、PDPの電極パターンを形成した後に、パターンが所定の形状であるかを検査する必要がある。そのためPDPを保持し、所定の長さの範囲の画像を撮像して画像信号に変換するラインカメラをPDPの表面に沿って順次走査し、画像信号を所定のアルゴリズムにより処理してガラス板の表面の電極パターンを検査している。尚、表示部の電極パターンと端子部の電極パターンとは相違するので、表示部の画像データは例えばアルゴリズムとして隣接比較法を用いて処理し、端子部の画像データは例えばアルゴリズムとしてDRC法を用いて処理している。
【0004】
【発明が解決しようとする課題】
PDPの電極パターンを検査する装置は例えばPDPを固定し、ラインカメラを所定の走査方向に沿って往復動させながら順次走査方向に対して直交方向にずらしていき電極パターンを撮像する。
【0005】
図3(a)に示すように、電極パターンPがラインカメラLCの走査方向Lに対して同じ方向に並設されている場合には、いずれか一方の端子部TについてラインカメラLCを例えば1往復させるだけで走査することができる。ところが、同図(b)に示すようにラインカメラLCの走査方向Lに対して直交する方向に電極パターンPが並設されていると、特に端子部Tを走査する場合にはラインカメラLCを何回も往復させなければならない。そのため、同図(a)に示したPDPの電極パターン検査に要する時間に比べて同図(b)に示したPDPの電極パターン検査に要する時間が相当長時間になり、検査処理能力が著しく低下するという不具合が生じる。
【0006】
そこで本発明は、上記の問題点に鑑み、電極パターンの並設方向が相違する2種類のPDPのいずれに対する検査も短時間で行い得る電極パターン検査装置を提供することを課題とする。
【0007】
【課題を解決するための手段】
上記課題を解決するために本発明は、ガラス板の表面に複数本の電極が所定方向に並べて形成されたプラズマディスプレイパネルを保持し、所定の長さの範囲の画像を画像信号に変換するラインカメラをプラズマディスプレイパネルの表面に沿って順次走査し、画像信号を所定のアルゴリズムにより処理してガラス板の表面の電極パターンを検査する検査装置であって、上記電極は相互に平行な表示部と該表示部の少なくとも一端に形成された略放射状の端子部とから構成され、表示部のパターンを検査するアルゴリズムと端子部のパターンを検査するアルゴリズムとが相違するものにおいて、上記ラインカメラの姿勢を、プラズマディスプレイパネルの表面に対して直交する軸線周りに90度回動する回動手段を設けたことを特徴とする。
【0008】
PDPに施されている電極パターンの並設方向に応じ、ラインカメラの走査方向を常に電極パターンの並設方向に一致させればよい。そのためにはラインセンサの走査方向を電極パターンの並設方向に応じて90度相違する2方向の内の1方向に設定する必要がある。但し、従来の検査装置はラインセンサを走査方向に移動させると共に走査方向に対して直角方向にラインカメラの順次ずらす機構を備えているため、走査方向を相互に90度異なる2方向の内のいずれかにすることはできる。但し、走査方向に対してラインカメラは常に同じ姿勢でなければならないため、走査方向が変更されればそれに応じてラインカメラの姿勢を90度回動させる。
【0009】
【発明の実施の形態】
図1を参照して、1はPDPの電極パターンを検査する検査装置であり、該検査装置11のベッド11に互いに平行に2本の摺動レール21が固定されている。該2本の摺動レール21には門形のレスト2が架設されている。該レストは図示しないサーボモータにより駆動され摺動レール21に沿って往復動する。該レストの水平部分には摺動レール31が取り付けられており、該摺動レール31には摺動子3が係合されている。該摺動子3は図示しないがレスト2に取り付けられたサーボモータにより往復動される。そして、該摺動子3には鉛直下方に向けられたラインカメラ4が、回動手段であるロータリーアクチュエータ41を介して取り付けられている。該ロータリーアクチュエータ41は90度の範囲で揺動自在の揺動軸を有しており、ラインカメラ4の中心が該揺動軸の揺動軸線上に位置するように、ラインカメラ4を該揺動軸の下端に取り付けている。従って、該ロータリーアクチュエータを作動させることによりラインカメラ4の姿勢を90度回動させることができる。
【0010】
所定の動作をプログラムしたロボットを該検査装置の近傍に配設し、該検査装置1に対してPDPの着脱を行う。ベッド11の上面には、PDPより一回り大きな発光部51が形成されており、該発光部51の下方に配置した発光体からの光を均一な状態にしてPDPに対して下方から透過光が与えられるように構成されている。また、ベッド11の上面には所定方向に対してPDPの位置決めをする1対のストッパ52と該所定方向に対して直交方向に対してPDPの位置決めを行う1対のストッパ53とが突設されている。更に、回動軸54に連結され先端にパッド54bが揺動自在に取り付けられたクランプアーム54aと、回動軸55に連結され先端にパッド55bが揺動自在に取り付けられたクランプアーム55aとが取り付けられている。尚、Sはレスト2の往復動方向を示し、Fは摺動子3の往復動方向を示す。
【0011】
上記図外のロボットが発光部51上にPDPをセットするとクランプアーム54a・55aを揺動させてPDPの位置決めを行う。図3(a)に示す状態と同じく、位置決めされた状態でPDPの電極パターンの並設方向がレスト2の往復動方向Sに一致している場合には、従来と同じく、方向Sを走査方向としてレスト2を前進させ、PDPの左右いずれか一側の端子部の画像を撮像する。その際、図外の画像処理装置はDRC法により端子部の画像を検査する。レスト2を前進端まで前進させると摺動子3を方向Fに沿ってラインカメラ4の撮像長さより若干短い所定距離移動させ、その後レスト2を走査方向であるSに沿って後退させる。そして該後退の際にも撮像を行う。このように、レスト2を方向Sに沿って前進及び後退させる毎に摺動子3を所定距離ずつ方向Fに沿ってずらすことによりPDPの表面全域を撮像することができる。尚、一側の端子部の検査が済み表示部の撮像を開始すると検査に用いるアルゴリズムを隣接比較法に切り替え、表示部から他側の端子部に撮像位置が移動するとアルゴリズムを再びDRC法に戻す。そして、PDPの全域について検査が終了すると検査が終了したPDPをロボットにより取り外し、代わりに未検査の新たなPDPを発光部51上にセットする。
【0012】
ところで、図3(b)に示すように発光部51上にセットされたPDPの電極パターンの並設方向が方向Sに対して直交する方向である場合には、ロータリーアクチュエータ41を作動させてラインカメラ4の姿勢を90度回動させる。そして、図2に示すように、摺動子3の往復動方向である方向Fを走査方向に設定して、端子部の検査を行う。尚、ラインカメラ4を往動及び復動させる毎にレスト2を方向Sに所定距離ずらしながら、上述の手順と同様の手順に従ってPDPの検査を行う。そして、検査が終了すると、クランプアーム54a・55aによる保持を解除し、ロボットによりPDPを取り外す。
【0013】
【発明の効果】
以上の説明から明らかなように、本発明は、PDPの電極パターンの配設方向に対してラインカメラの走査方向が一致するようにラインカメラの姿勢を回動させるのでラインカメラによる走査時間が延長されない。
【図面の簡単な説明】
【図1】本発明の一実施の形態の構成を示す図
【図2】ラインカメラを回動した状態での走査方向を示す図
【図3】PDPの電極パターンを示す図
【符号の説明】
1 検査装置
2 レスト
4 ラインカメラ
41 ロータリーアクチュエータ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for inspecting, for example, an electrode pattern of a plasma display panel (hereinafter, also referred to as “PDP”) facing each other with a neon gas interposed therebetween by image processing.
[0002]
[Prior art]
A plurality of electrodes are formed on the surface of the PDP, and the electrodes are composed of a display portion parallel to each other and a substantially radial terminal portion formed at at least one end of the display portion. One plasma display is configured by two PDPs facing each other with a predetermined interval and, for example, neon gas is sealed between the two PDPs. The two PDPs are not the same as each other, and the patterns of the respective display units must be in directions orthogonal to each other.
[0003]
On the other hand, after the PDP electrode pattern is formed, it is necessary to inspect whether the pattern has a predetermined shape. Therefore, a line camera that holds the PDP, captures an image in a predetermined length range, and converts it into an image signal is sequentially scanned along the surface of the PDP, and the image signal is processed by a predetermined algorithm to process the surface of the glass plate. The electrode pattern is inspected. Since the electrode pattern of the display unit and the electrode pattern of the terminal unit are different, the image data of the display unit is processed using, for example, the adjacent comparison method as an algorithm, and the image data of the terminal unit is used, for example, as the algorithm using the DRC method. It is processed.
[0004]
[Problems to be solved by the invention]
An apparatus for inspecting an electrode pattern of a PDP, for example, fixes the PDP, and images the electrode pattern by sequentially shifting the line camera in a direction orthogonal to the scanning direction while reciprocating along a predetermined scanning direction.
[0005]
As shown in FIG. 3A, when the electrode pattern P is arranged in parallel in the same direction with respect to the scanning direction L of the line camera LC, the line camera LC is set to one of the terminal portions T, for example, 1 It is possible to scan only by reciprocating. However, when the electrode pattern P is arranged in a direction orthogonal to the scanning direction L of the line camera LC as shown in FIG. It must be reciprocated many times. Therefore, the time required for the electrode pattern inspection of the PDP shown in FIG. 5B is considerably longer than the time required for the electrode pattern inspection of the PDP shown in FIG. The trouble of doing occurs.
[0006]
Therefore, in view of the above problems, an object of the present invention is to provide an electrode pattern inspection apparatus capable of performing an inspection for any of two types of PDPs having different electrode pattern parallel arrangement directions in a short time.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is a line for holding a plasma display panel in which a plurality of electrodes are arranged in a predetermined direction on the surface of a glass plate and converting an image within a predetermined length into an image signal. An inspection device that sequentially scans a camera along the surface of a plasma display panel and processes an image signal according to a predetermined algorithm to inspect an electrode pattern on the surface of a glass plate, the electrodes being connected to a display unit parallel to each other The line camera is composed of a substantially radial terminal formed on at least one end of the display unit, and the algorithm for inspecting the pattern of the display unit is different from the algorithm for inspecting the pattern of the terminal unit. Rotating means for rotating 90 degrees around an axis perpendicular to the surface of the plasma display panel is provided.
[0008]
The scanning direction of the line camera should always coincide with the direction in which the electrode patterns are arranged in accordance with the direction in which the electrode patterns are arranged on the PDP. For this purpose, it is necessary to set the scanning direction of the line sensor to one of two directions that differ by 90 degrees depending on the direction in which the electrode patterns are arranged side by side. However, since the conventional inspection apparatus includes a mechanism for moving the line sensor in the scanning direction and sequentially shifting the line camera in a direction perpendicular to the scanning direction, any of the two directions differing from each other by 90 degrees in the scanning direction. You can do it. However, since the line camera must always have the same posture with respect to the scanning direction, if the scanning direction is changed, the posture of the line camera is rotated by 90 degrees accordingly.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes an inspection apparatus for inspecting an electrode pattern of a PDP. Two slide rails 21 are fixed to a bed 11 of the inspection apparatus 11 in parallel to each other. A gate-shaped rest 2 is installed on the two slide rails 21. The rest is driven by a servo motor (not shown) and reciprocates along the slide rail 21. A slide rail 31 is attached to the horizontal portion of the rest, and the slider 3 is engaged with the slide rail 31. Although not shown, the slider 3 is reciprocated by a servo motor attached to the rest 2. A line camera 4 oriented vertically downward is attached to the slider 3 via a rotary actuator 41 that is a rotating means. The rotary actuator 41 has a swing shaft that can swing within a range of 90 degrees, and the line camera 4 is swung so that the center of the line camera 4 is located on the swing axis of the swing shaft. It is attached to the lower end of the moving shaft. Therefore, the posture of the line camera 4 can be rotated 90 degrees by operating the rotary actuator.
[0010]
A robot programmed with a predetermined operation is disposed in the vicinity of the inspection apparatus, and the PDP is attached to and detached from the inspection apparatus 1. A light emitting section 51 that is slightly larger than the PDP is formed on the upper surface of the bed 11, and the light from the light emitting body disposed below the light emitting section 51 is made uniform to transmit light from below to the PDP. Configured to be given. In addition, a pair of stoppers 52 for positioning the PDP with respect to a predetermined direction and a pair of stoppers 53 for positioning the PDP with respect to a direction orthogonal to the predetermined direction protrude from the upper surface of the bed 11. ing. Further, there are a clamp arm 54a connected to the rotating shaft 54 and having a pad 54b swingably attached to the tip, and a clamp arm 55a connected to the turning shaft 55 and having a pad 55b swingably attached to the tip. It is attached. S represents the reciprocating direction of the rest 2 and F represents the reciprocating direction of the slider 3.
[0011]
When a robot (not shown) sets the PDP on the light emitting unit 51, the clamp arms 54a and 55a are swung to position the PDP. Similar to the state shown in FIG. 3A, when the parallel arrangement direction of the electrode patterns of the PDP coincides with the reciprocating direction S of the rest 2 in the positioned state, the direction S is set in the scanning direction as in the conventional case. Then, the rest 2 is moved forward, and an image of the terminal portion on either the left or right side of the PDP is taken. At that time, the image processing apparatus (not shown) inspects the image of the terminal portion by the DRC method. When the rest 2 is advanced to the forward end, the slider 3 is moved along the direction F by a predetermined distance slightly shorter than the imaging length of the line camera 4, and then the rest 2 is retracted along S that is the scanning direction. Imaging is also performed during the backward movement. Thus, every time the rest 2 is moved forward and backward along the direction S, the entire surface of the PDP can be imaged by shifting the slider 3 along the direction F by a predetermined distance. Note that when the one-side terminal portion is inspected and imaging of the display portion is started, the algorithm used for the inspection is switched to the adjacent comparison method, and when the imaging position moves from the display portion to the other-side terminal portion, the algorithm is returned to the DRC method . When the inspection of the entire area of the PDP is completed, the PDP that has been inspected is removed by the robot, and a new uninspected PDP is set on the light emitting unit 51 instead.
[0012]
By the way, as shown in FIG. 3B, when the parallel arrangement direction of the electrode patterns of the PDP set on the light-emitting portion 51 is a direction orthogonal to the direction S, the rotary actuator 41 is actuated to operate the line. The posture of the camera 4 is rotated 90 degrees. And as shown in FIG. 2, the direction F which is the reciprocating direction of the slider 3 is set to a scanning direction, and a terminal part is test | inspected. The PDP is inspected according to the same procedure as described above while the rest 2 is shifted by a predetermined distance in the direction S each time the line camera 4 is moved forward and backward. When the inspection is completed, the holding by the clamp arms 54a and 55a is released, and the PDP is removed by the robot.
[0013]
【The invention's effect】
As is clear from the above description, the present invention rotates the posture of the line camera so that the scanning direction of the line camera matches the arrangement direction of the electrode pattern of the PDP, so that the scanning time by the line camera is extended. Not.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of an embodiment of the present invention. FIG. 2 is a diagram showing a scanning direction when a line camera is rotated. FIG. 3 is a diagram showing an electrode pattern of a PDP.
1 Inspection device 2 Rest 4 Line camera 41 Rotary actuator

Claims (1)

ガラス板の表面に複数本の電極が所定方向に並べて形成されたプラズマディスプレイパネルを保持し、所定の長さの範囲の画像を画像信号に変換するラインカメラをプラズマディスプレイパネルの表面に沿って順次走査し、画像信号を所定のアルゴリズムにより処理してガラス板の表面の電極パターンを検査する検査装置であって、上記電極は相互に平行な表示部と該表示部の少なくとも一端に形成された略放射状の端子部とから構成され、表示部のパターンを検査するアルゴリズムと端子部のパターンを検査するアルゴリズムとが相違するものにおいて、上記ラインカメラの姿勢を、プラズマディスプレイパネルの表面に対して直交する軸線周りに90度回動する回動手段を設けたことを特徴とするプラズマディスプレイパネルの電極パターン検査装置。    A line camera that holds a plasma display panel in which a plurality of electrodes are arranged in a predetermined direction on the surface of a glass plate and converts an image within a predetermined length into an image signal is sequentially applied along the surface of the plasma display panel. An inspection apparatus that scans and processes an image signal according to a predetermined algorithm to inspect an electrode pattern on the surface of a glass plate, wherein the electrodes are substantially parallel to each other and formed on at least one end of the display portion. The line camera posture is orthogonal to the surface of the plasma display panel, in which the algorithm for inspecting the pattern of the display portion is different from the algorithm for inspecting the pattern of the terminal portion. An electrode pattern for a plasma display panel, characterized in that it is provided with a rotating means that rotates 90 degrees around an axis. Emissions inspection equipment.
JP19071098A 1998-07-06 1998-07-06 Electrode pattern inspection device for plasma display panel Expired - Fee Related JP3904730B2 (en)

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