JPH09269348A - Contact film for inspection of display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device by which pixels on a color display panel can be turned on according to their color, which is manufactured at low costs, whose electric reliability can be ensured and which is small. SOLUTION: A contact film 1 is provided with a flexible contact film body 2 in which a plurality of contact makers R's, G's, B's individually corresponding to signal terminals Ra's, Ga's, Ba's, for pixel electrodes, for the three primary colors of a display panel are formed on one face. At this time, oval-shaped leads Gc's for conneciton are formed at rear end parts of the contact makers G's of one color out of the contact makers R's, G's, B's. A zigzag wiring pattern which bonds the adjacent lands Gc's for connection in a series shape is formed on the bonding face of a film 3, for connection, which is bonded to the contact film body 2 in a laminated shape. Green-signal input parts G1 are formed at both end parts of the wiring pattern. The electric connection of the contact film 1 to the film 3 for connection can be inspected across the green-signal sinput parts G1.

Description

Detailed Description of the Invention

The present invention relates to a liquid crystal display panel,
The present invention relates to a contact film for display panel inspection, which can be suitably used for inspection of display quality of electroluminescent panels, plasma display panels and the like.

2. Description of the Related Art Generally, an active matrix type liquid crystal display panel has one pixel arranged at each intersection of a plurality of signal lines arranged in a grid pattern, and each pixel is formed by a thin film transistor. An element, a transparent pixel electrode connected to one electrode (drain electrode) of the element, and a transparent common electrode arranged facing the transparent pixel electrode via a liquid crystal. Further, in the color liquid crystal display panel, a color filter in which dots of three colors of red (R), green (G), and blue (B) are arranged in a matrix is used, and corresponding dots of each color are used. The transparent pixel electrode is arranged. Further, in this type of liquid crystal display panel, a pixel electrode signal line terminal connected to the electrodes (source electrode, gate electrode) of the pixel switching element and a transparent electrode are formed on the transparent insulating substrate in the peripheral portion of the liquid crystal display section. Terminals and the like of the common electrode signal line connected to the common electrode are divided into blocks for each drive module and arranged. Conventionally, in order to inspect the display quality and the like of this type of liquid crystal display panel before connecting and fixing peripheral circuits such as a drive module, the signal line terminals of the liquid crystal display panel are commonly referred to as contact films. A liquid crystal display panel inspection device is used in which a contact formed of a conductor is brought into contact with one surface of a conductive film with a required pressing force to turn on the liquid crystal display panel (see, for example, JP-A-2-78969). In the conventional inspection device for color liquid crystal display panel, one liquid crystal drive signal is simultaneously supplied to the signal line terminals for the pixel electrodes for each color of the color liquid crystal display panel through the contacts formed on the flexible film. By doing so, it is general that the pixels of three colors are simultaneously turned on and the color liquid crystal display panel is turned on white.
Therefore, the contactor on the flexible film in the conventional inspection device for color liquid crystal display panel is arranged so as to contact the pixel electrode signal line terminal for each color of the color liquid crystal display panel at the same time. Generally, a pattern is formed in a direction crossing the signal line terminals. Therefore, the wiring pattern for signal supply connected to the contactor contacting the pixel electrode signal line terminal may be a simple and simple pattern, together with the wiring pattern connected to the contactor contacting the common electrode signal line terminal. It can be easily formed on one side of the flexible film.

In recent years, there has been an increasing demand for strictly performing a lighting inspection of a color display panel for each color.
In that case, it is necessary to arrange the contacts on the flexible film at the same pitch for the pixel electrode signal line terminals for each color in the color display panel, and to correspond to the pixel electrode signal line terminal groups for each color. It is necessary to individually supply signals to the three contact groups. Therefore, when it is attempted to form the signal wiring for individually supplying a signal to these three contactor groups as an independent pattern for each contactor together with the contactor on one surface of the flexible film, the signal of the signal wiring is Since the pitch at the input end must be much larger than the pitch of the contacts, the width of the flexible film increases,
Since the flexible printed wiring board, the connector, etc. for connecting to the signal wiring on the flexible film also become large in size, the display panel inspection device cannot be made into a portable and compact socket form. On the other hand, if the signal wiring connected to each contact group on the flexible film has a pattern shape terminated at the signal input end side, the above-mentioned problem can be solved, but the pixel electrode for each color is 3 Since it is formed alternately in order of each color, the signal wire connected to each of the three contact groups corresponding to the signal line terminal group for the pixel electrode for each color is not short-circuited on one side of the flexible film. It is impossible to form into. In addition, one of the signal wirings is divided at a branch wiring portion near the contact, and a wiring portion on the signal input end side is formed on the back surface of the flexible film to form a wiring portion on the signal input end side. A method of forming a three-dimensional circuit by connecting the wiring part on the contact side with a through hole is also conceivable.
As many through holes as the number of contacts are required. In addition, since the branch wiring part near the contact has a fine pitch, high accuracy is required for forming the through hole, and high alignment accuracy is required for forming both wiring parts on both sides of the flexible film. Is required, which causes a significant increase in manufacturing cost. Therefore, an object of the present invention is to connect the pixel electrode signal line terminals of the color display panel to each color for lighting, and to ensure electrical reliability at a low manufacturing cost, and to provide a contact device. (EN) Provided is a contact film for display panel inspection, which can be miniaturized.

In order to solve the above-mentioned problems, the invention of claim 1 provides a contactor on one side surface of a contact film body for each of signal line terminals for pixel electrodes for three colors of a display panel. Are arranged so that they can be joined individually, and the wiring pattern connected to the signal input section of the same color is connected to the tip of the contact corresponding to any one of the three colors, and the contact pattern corresponding to any one of the other colors is connected. A wiring pattern connected to the signal input portion of that color is connected to the base end portion, and a long connecting land is provided in the front and rear at the base end portion of the contact corresponding to the other one of the above two colors. The connection film to be joined to the film body in a laminated manner is provided with a connection terminal at each of the front and rear ends of the connection land, and the front end side of these connection terminals, and the rear end side of each of the connection terminals. For connecting in a staggered manner It is a contact film for display panel inspection, which is connected and routed so as to form a series with all of the bands, and its both ends are connected to the signal input part of the other one of the above two colors separately arranged. is there. According to the above invention, the contact film body having the wiring pattern on one side and the connecting film can be manufactured at low cost, so that the manufacturing cost can be reduced as compared with the case of using another double-sided board or the like. Is possible. Further, since it is possible to form the three signal wirings without short-circuiting without the need for through holes, it is possible to adapt to the signal line terminals for pixel electrodes with fine intervals, and the contact film is used. The contact device can also be downsized. Furthermore, the signal wiring through the wiring pattern formed on the connection film side can be tested by conducting a continuity test between a pair of separately provided signal input sections when confirming the connection state to the contact film body side. The connection of all contacts can be confirmed, and the number of inspection steps increased by joining two flexible substrates can be made extremely simple and reliable. In addition, by inputting signals from the respective signal input portions that are divided into left and right sides on the connection film side, the signals supplied to the contacts are averaged, and a more accurate inspection of the display panel is realized. According to a second aspect of the present invention, in the above invention, the insulating film is formed in a laminated shape on the wiring pattern formed on the contact film body and connected to the tip of the contact corresponding to any one of the three colors. In addition, an insulating coating is formed in a laminated form on the wiring pattern portion other than the connection terminals and the signal input portion of the connection film, and the contact film body and the connection film are anisotropic conductive film or solder. The above contact film for display panel inspection is thermocompression bonded using plating.
According to the above invention, it is possible to secure the mutual insulation state of the three signal wiring patterns, and it is possible to extremely easily realize the mechanical connection and the electrical connection between the contact film body and the connection film. Therefore, it is possible to reduce the number of manufacturing steps and reduce the cost of a contact device for inspecting a display panel using a contact film. According to a third aspect of the present invention, the signal input portions provided on both ends of the wiring pattern of the other one color of the above two colors, which are provided on the connection film, are adjacent to each other while maintaining insulation around one through hole. The contact film for inspecting a display panel according to any one of the above, which is arranged in the above manner.
According to the above invention, when inspecting the electrical connection state of the contact film main body and the connection film, an electrical continuity test between the two signal input parts which are separately held in the insulated state is performed. After completing the test and connecting the signal input part to the signal supply side provided on another board, a conductor such as solder is poured into the through hole to connect the two signal input parts at the same time. Also, the connection can be completed, and the connection can be completed in one step. According to a fourth aspect of the present invention, three signal input portions selected from both ends and an intermediate portion of the wiring pattern of the other one color of the above two colors provided on the connection film are insulated with one through hole as a center. The contact film for a display panel inspection according to any one of the above, which is disposed adjacently while being held. According to the above invention,
When inspecting the electrical connection state of the contact film body and the connection film, the one of the three signal input parts, which are separately kept in the insulating state, on the left side and the central part, or the central part It is possible to perform a signal continuity test between the right side and the right side, and when a connection failure occurs, the inspection symmetry is subdivided, so that the defective location can be found very easily. In addition, when the test is completed and the signal input section is connected to the signal supply side provided on another board, a conductor such as solder is poured into the through hole to make connection, and at the same time,
Since three signal input parts can be connected to each other, in one step,
You can complete the connection. Further, since the signal input portions on the left and right sides and the central portion can ensure a uniform signal strength as a whole, an extremely accurate inspection of the display panel can be realized. According to a fifth aspect of the present invention, there is provided the display panel inspection contact film as described above, which has a shape that fits or meshes along the contour of the connection land formed on the contact film body side of the connection terminal formed on the connection film. is there. According to the above invention, since the connection terminal and the connection land are fitted or meshed with each other, the matching of the joining positions can be recognized even if the connection state cannot be visually confirmed.
Accurate joining can be reliably performed.

First Embodiment A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a contact film before assembling corresponding to signal line terminals of a color liquid crystal display panel, and FIG. 2 is an explanatory view showing the assembled contact film in a perspective state. FIG.
The contact film 1 shown in (1) includes a contact film body 2 and a connecting film 3 that is bonded to the side surface of the contact film body 2 on which the wiring pattern is formed in a laminated manner. On one side surface of the contact film main body 2, there are three colors of red Ra, green Ga and blue Ba of signal line terminals for a plurality of pixel electrodes arranged and formed on a substrate extending from a contour edge of the liquid crystal display panel. The contacts R, G, B corresponding to are alternately arranged in units of 3 colors and 3
The signal line terminals Ra, Ga, and Ba for all colors are individually supplied with signals for inspection such as display quality. The contact film main body 2 is a flexible resin-made flexible substrate such as a polyimide film or a polyester film formed in a substantially rectangular shape. The contact surface is joined to the terminals Ra, Ga, Ba,
The contacts R, G, B are arranged in parallel on the contact surface portion. The contacts R, G, and B are alternately arranged in the order of red R, green G, and blue B from the left end, and are set to have substantially the same width and length. Then, all the contacts R for red are further extended toward the tip side edge of the contact film body 2 and connected to the wiring pattern Rb extended along the tip side edge of the contact film body 2. Both ends of the wiring pattern Rb are extended rearward along the contour edge of the contact film body 2 and are connected so as to form a closed circuit on the rear side, and the middle of the wiring pattern on the rear side is formed. A red signal input portion Rc is formed in a circular land portion, and a through hole 4 is formed in the center of the red signal input portion Rc. The red wiring pattern Rb is entirely covered with a strip-shaped insulating coating 5 made of resist or the like. It should be noted that the material of the insulating coating 5 may be a thin, flexible and highly reliable insulating film, and may be a thin film sheet attached or coated with an insulating paint. Good. The same applies to the insulating coating 5 used thereafter. Further, the green contactors G adjacent to the red contactors R are inclined so that the rear end portions of all of them are close to the adjacent red contactor R side, and are extended rearward, and the end portions thereof are Has oval-shaped connecting lands Gc that are long in the front-rear direction, and these connecting lands Gc are arranged at regular intervals in the left-right direction and are connected to a wiring pattern formed on a connecting film 3 described later. It has become so. Further, all the rear ends of the blue contacts B adjacent to the green contacts G are linearly extended rearward, and the green connection lands Gc and the red signal input parts Rc are formed. Is connected to a wiring pattern Bb extending in the left-right direction, and a circular blue signal input portion Bc is formed in the middle of the wiring pattern Bb. A through hole 4 is formed in the center of the.
On the other hand, green signal input portions G1 are formed on the left and right rear sides of the joint surface of the connection film 3, and through holes 4 are formed in the central portions of the two signal input portions G1. . The wiring patterns symmetrically extended forward from the left and right signal input portions G1 are extended to the tip side of the connection film 3 and then folded back to form a substantially J-shape. A connection terminal G2 having a diameter corresponding to the circular portion of the end of the ellipse is formed at a position corresponding to the end portion on the front end side of the connection land Gc for green. Similar connection terminals G2 are also formed at positions corresponding to the portions. Further, the connection terminal G2 on the rear end portion side is connected to the connection terminal G2 arranged corresponding to the rear end portion of the adjacent green connection land Gc by a wiring pattern folded in a substantially U shape. Has been done. Further, the connection terminal G2 arranged corresponding to the tip of the adjacent green connection land Gc is substantially U-shaped with respect to the connection terminal G2 corresponding to the tip of the adjacent connection land Gc. It is connected by the wiring pattern folded back to. Similarly, the wiring pattern formed from left to right is the contact film body 2
When connected to each other, the connecting lands Gc for green are connected so as to form a zigzag shape and are energized in series. Furthermore, the wiring pattern portions other than the left and right signal input portions G1 and the connection terminals G2 of the connection film 3 are covered with an insulating coating 5. For the contact film body 2 configured as described above,
The connection films 3 are joined in a laminated form and bonded by, for example, thermocompression bonding using an anisotropic conductive film or solder plating. In case of joining, connection film 3
All the connection terminals G2 formed in the above are respectively joined corresponding to the front and rear ends of the green connection lands Gc on the contact film body 2 side, and the green wiring pattern is provided between the left and right signal input portions G1. Form a continuous circuit. By providing the connection film 3, it is not necessary to perforate each of the signal contacts R, G, and B even though the wiring pattern is compatible with the three colors, and the connection between the contacts R, G, and B is eliminated. It is possible to progress the miniaturization of the gap,
In addition, it is possible to use the contact film main body 2 having the wiring pattern on only one surface, which can be manufactured relatively inexpensively. In addition, when inspecting the connection state after the connection film 3 is bonded, all the electrical connection parts (connection lands Gc, connection terminals G2) are wired in series, and there is continuity between the left and right signal input parts G1. Only by performing the test, it becomes possible to inspect all of the green contacts G. Further, since the left and right signal input portions G1 can input signals from the left and right, more stable signal input is possible. The wiring pattern of the connecting film 3 can be changed to that shown in FIG. In the wiring pattern of FIG. 3, the left and right wiring patterns extended rearward are gathered in one place at the rear portion, and a pair of left and right semi-circular signal input portions G1
The through hole 4 is formed between the signal input portions G1. The signal input portions G1 are formed to be electrically separated from each other. When conducting the conduction test, the conduction test is performed in the state of being separated into the left and right sides, the bonding with the contact film body 2 is completed, and the signal is conducted. in case of,
A conductor such as solder is poured into the through hole 4 to connect the left and right signal input portions G1.
In addition, red (R), green (G) and blue (B)
Order of the contacts R, G, B of the signal line input unit Rc,
The wiring patterns for connecting Bc, G1 and these are not limited to those in the above embodiment, and the arrangement order of each color is changed according to the arrangement of the signal line terminals 1 on the liquid crystal display panel side. It is also possible to change the corresponding colors of the signal line input parts Rc, Bc, G1 and the wiring pattern.

Second Embodiment Hereinafter, a second embodiment included in the present invention will be described with reference to FIGS. 4 to 6. 4 is a plan view of the contact film body, FIG. 5 is a plan view of the connection film, and FIG. 6 is an explanatory view showing the completed contact film in a see-through state. Since the structure of the contact film body 2 shown in FIGS. 4 and 6 is basically the same as that shown in FIGS. 1 and 2, the same components are designated by the same reference numerals, and the description thereof will be omitted. Different connection films 3 will be described.
The connecting film 3 shown in FIG. 5 differs from the connecting film shown in the first embodiment in that the signal input portions G1 arranged on the left and right are arranged in the center and one circular land is divided into three parts. That is, the three wiring patterns extending from the left and right and central connection terminal G2 sides are connected to the three signal input sections G3, G4, and G5, respectively. A through hole 4 is formed in the center of each of the three signal input sections G3, G4, G5, and each signal input section is in the state of the connecting film 3 alone before being joined to the contact film body 2. G3, G4 and G5 are electrically separated from each other. And the contact film body 2
When testing the energization state of the contacts G for each green after they are laminated to each other, for example, the signal input unit G3 on the left side is used.
Conducting test between the central signal input section G4 and the central signal input section G4.
It becomes possible to conduct an energization test between the connection terminal G2 and the contact terminal G2 of any contactor G even if a defect occurs.
It is possible to quickly confirm whether the connection is poor. In addition, when the contact film 1 is used after being completed, signal input is performed from the left and right and the center portion to the green contacts G arranged in the left and right directions, so that uneven signal input is reduced and stable. Enables signal input.

Third Embodiment Hereinafter, a third embodiment included in the present invention will be described with reference to FIGS. 7 to 11. Figure 7
8 is a plan view of the contact film body, FIG. 8 is a plan view of the connection film, FIG. 9 is an explanatory view showing the completed contact film in a perspective state, and FIG. 10 is a connection land and a connection land of the contact film body 2. 11 is a cross-sectional view schematically showing a joined state of the film 3 for connection with a connection terminal, and FIG.
FIG. 11 is a cross-sectional view showing a state where the joining of FIG. 10 is completed.
11 and 10, only the connecting terminal fitting structure is shown, and other wiring patterns are not shown. The configuration of the contact film body 2 shown in FIGS. 7 and 9 is basically the same as that shown in FIGS. 1 and 2, and the same components are designated by the same reference numerals and the description thereof will be omitted. The connection film 3 having a configuration different from that of each of the above-described examples will be described below. FIG.
The connecting film 3 shown in FIG. 3 differs from the connecting film shown in Example 2 in the shape of the connecting terminal G2. The connection terminal G2 is formed so as to have a substantially J-shape corresponding to the contour shape of the oval connection land Gc formed on the side of the contact film body 2 to be joined, and the connection terminal G2 arranged on the tip side. Is an oval connecting land Gc
The connection land G2 arranged on the rear side corresponding to the left side edge portion is formed so as to correspond to the right side edge portion of the oval connection land Gc. By using the connection terminal G2 formed in this way, the positioning when joining the contact film body 2 and the connection film 3 can be performed by fitting the connection terminal G2 and the connection land Gc. Even if the joint portion cannot be visually confirmed, accurate positioning can be made possible by the fitting feeling. When the contact film body 2 and the connecting film 3 are joined, they are bonded by thermocompression bonding using, for example, an anisotropic conductive film or solder plating, as in the above-described embodiment. .

According to the present invention, the signal line terminals for pixel electrodes of a color display panel can be connected to each other by color and turned on, and the electrical reliability can be secured at a low manufacturing cost, and Thus, it is possible to provide a contact film for inspecting a display panel, which can downsize the contact device.

[Brief description of drawings]

FIG. 1 is a plan view showing a corresponding state of a contact film body and a connection film with respect to a signal line terminal of a display panel of Example 1.

FIG. 2 is an explanatory view showing a wiring pattern of the contact film of FIG. 1 in a transparent manner.

FIG. 3 is a plan view showing an application example of a wiring pattern of a connection film.

FIG. 4 is a plan view of a contact film body of Example 2.

5 is a plan view showing a wiring pattern of a connecting film of Example 2. FIG.

FIG. 6 is an explanatory view showing the contact film of Example 2 in a transparent manner.

FIG. 7 is a plan view of a contact film body of Example 3.

FIG. 8 is a plan view showing a wiring pattern of a connection film of Example 3.

FIG. 9 is an explanatory view showing the contact film of Example 3 in a transparent manner.

FIG. 10 is an explanatory view illustrating a fitting state of the connection land of the contact film body and the connection terminal of the connection film.

FIG. 11 is an explanatory view illustrating a fitting state of the connection land of the contact film body and the connection terminal of the connection film.

[Explanation of symbols]

 1 Contact Film 2 Contact Film Body 3 Connection Film 4 Through Hole 5 Insulating Film R Contactor (for Red) G Contactor (for Green) B Contactor (for Blue) Ra Signal Line Terminal of Display Panel (for Red) Ga Display panel signal line terminal (for green) Ba Display panel signal line terminal (for blue) Rb Wiring pattern (for red) Bb Wiring pattern (for blue) Rc Signal input part (for red) Gc connection land (for green) ) Bc signal input part (for blue) G1 connection film signal input part G2 connection film connection terminal G3, G4, G5 signal input part (for green)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // H01R 11/01 H01R 11/01 G

Claims (5)

[Claims] 1. A plurality of pixel electrode signal line terminals for three colors of red, green, and blue arranged on a display panel are bonded to one side surface of a contact film body having insulation and flexibility. Of the three colors, the wiring pattern connected to the signal input section of the color is connected to the tip of the contact corresponding to any one of the three colors, and the contact corresponding to any one of the other colors. A wiring pattern connected to the signal input portion of that color is connected to the base end portion of the, and long connecting lands are formed at the base end portion of the contact corresponding to the other one of the above two colors. The connecting film of the connecting film, which is joined to the contact film body in a laminated manner, is connected to the front and rear ends of the connecting land, which is long in the front-rear direction, on the joint surface of the connecting film corresponding to the connecting land. Connection terminal
Wiring is routed so that adjacent leading ends and trailing ends are connected in a staggered manner and the connecting lands are connected in series, and both ends of the wiring pattern are arranged separately for each color signal. A contact film for display panel inspection, which is connected to an input section. 2. A plurality of pixel electrode signal line terminals for three colors of red, green, and blue arranged on a display panel are bonded to one side surface of a contact film body having insulating properties and flexibility. Wiring patterns connected to the tip of the contact corresponding to any one of the three colors, and the wiring pattern connected to the signal input section of the color is connected to the tip of the contact. An insulating film is formed on the contact, and the wiring pattern connected to the signal input portion of the color is connected to the base end of the contact corresponding to any other color, and the contact corresponding to the other one of the above two colors. Long connecting lands are formed in the front and rear at the base end portion of the connecting film, while the connecting film of the connecting film bonded to the contact film body in a laminated form has a connecting surface corresponding to the connecting lands. With the front end of the connection land that is long in the front and back The connection terminals respectively connected to the rear end portions are arranged so that the adjacent front end sides and the rear end sides are alternately connected to each other so that the connection lands are connected in series. Both end portions are connected to the signal input portion of the color respectively arranged separately, and the other wiring pattern portion except the connection terminal and the signal input portion is covered with an insulating film, the contact film body and the connection film A contact film for display panel inspection, characterized by being bonded by thermocompression bonding using an anisotropic conductive film or solder plating. 3. A signal input portion provided at both ends of a wiring pattern for another color of two colors, which is provided on the side of the connection film and is routed around the wiring, has a single penetration penetrating the connection film in the thickness direction. The display panel inspection contact film according to claim 1, wherein the contact films are arranged so as to be adjacent to each other in an insulating state with the hole as a center. 4. The three signal input portions extending from both ends and a midway portion of a wiring pattern for another color of two colors provided on the side of the connection film and arranged around the wiring are formed in the thickness direction of the connection film. 4. The display panel inspection contact film according to claim 1, wherein the contact film is arranged adjacent to each other so as to form a ring in an insulated state with one through hole penetrating therethrough as a center. 5. The connection terminal provided on the connection film is formed so as to fit or mesh with the contour of a connection land provided on the contact film body side. 5. The contact film for display panel inspection according to any one of 4 to 4.