JP2005316037A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that in the prior art there are heretofore no methods of three-dimensionally forming resistances in the portions of windows by forming junctures as the windows and the means for protecting driving circuits against the abnormal charges of panels of a PDP, FED, etc., are intricate. <P>SOLUTION: The structure that the electrode themselves are covered with insulating films or insulating sheets and the fine windows are opened in the insulating films or insulating sheets only in the electrode leading sections and are used as the junctures to the outside is employed. The resistors can be simply installed to the respective leading electrodes by using resistant pastes in the junctures. Also, the leading electrode structures are isolated from the surrounding electrodes by the insulating films or insulating sheets and therefore the manufacture is easy and there is an effect of high reliability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device in which a wiring board is connected to an electrode derived from each electrode formed on a substrate of a display panel.

  In particular, a self-luminous flat display panel such as a plasma display panel or a field emission display is used to excite phosphors in a sealed space in a vacuum atmosphere between a pair of opposing glass substrates. It can be suitably used for a self-luminous flat display device.

  As a flat display panel in which pixels are configured in a two-dimensional manner between a pair of glass substrates arranged opposite to each other to display an image, a liquid crystal panel using liquid crystal as a display element or fluorescent in a sealed space in a vacuum atmosphere Examples include a plasma display panel (hereinafter referred to as “PDP”) and a field emission display (hereinafter referred to as “FED”) that emit light by exciting the body.

  In a flat display device using these flat display panels (hereinafter referred to as “FPD”), high definition is progressing in order to improve image quality. For this reason, the number of display electrodes is also increased, and the arrangement pitch (interval) of a large number of electrode terminals led out and arranged at the edge of the glass substrate is becoming narrower.

  Usually, a flexible printed circuit board (hereinafter abbreviated as “FPC”), which is a wiring board, is used to connect an FPD that is a display panel and a drive circuit that drives the FPD. The connecting portion of the FPC is connected by thermocompression bonding via an anisotropic conductive film.

  However, since the arrangement pitch of the electrode terminals is narrow, there is a possibility that an electrical short circuit may occur between the adjacent electrodes when a minute conductive foreign matter adheres between the adjacent electrodes.

  Therefore, for example, in FIG. 5 of Patent Document 1 (Japanese Patent Laid-Open No. 2000-347592), an electrode exposed through the through holes is covered with an insulating sheet having through holes arranged in a staggered manner on the electrode terminal portions of the FPD. A connection structure in which a terminal portion and a connection terminal portion of an FPC are connected by thermocompression bonding via an anisotropic conductive film is disclosed. According to this connection structure, since the exposed electrode terminal portions are staggered, the distance between adjacent electrode terminals is widened, and a short circuit is less likely to occur.

  Moreover, in patent document 2 (Unexamined-Japanese-Patent No. 2003-178686), contrary to the said patent document 1, it is a part of each electrode terminal so that the exposed part of the electrode terminal of the edge part of FPD may become zigzag form. An insulating layer is provided to prevent short circuit.

  As an example of disclosure in which connection terminals are arranged in a staggered manner on the FPC side, there is, for example, Patent Document 3 (Japanese Patent Laid-Open No. 6-120632).

  On the other hand, in self-luminous flat display panels such as PDP and FED (hereinafter referred to as “self-luminous FPD”), display panel abnormalities (abnormal discharges, electrode short-circuits, etc.) that are a load on the driving circuit for driving these panels. It is necessary to protect against element destruction of the drive circuit that occurs in the load state.

  Thus, for example, a conventional example in which chip resistance is provided in an FPC that connects a self-luminous FPD and a drive circuit to prevent element destruction is shown in the prior art section of Patent Document 4 (Japanese Patent Laid-Open No. 11-344936). 6. However, in this case, a large number of chip resistors are required due to an increase in the number of display electrodes accompanying the increase in definition, and there is a situation that costs increase. Therefore, in Patent Document 4, a member having a high resistivity is used for the wiring conductor of the electrode terminal derived from the FPC wiring conductor or each electrode of the FPD, and resistance (hereinafter referred to as “wiring resistance”) is used in the wiring conductor. A technique for forming and limiting the current and reducing the risk of element destruction of the drive circuit is disclosed.

Japanese Patent Laid-Open No. 2000-347592 (FIG. 5) JP 2003-178686 A Japanese Patent Laid-Open No. 6-120632 Japanese Patent Laid-Open No. 11-344936

  However, the disclosed technologies disclosed in Patent Documents 1 and 2 that can make the exposed electrode terminal portions staggered when connecting the electrode terminals of the FPD and the FPC have the following circumstances.

  That is, in FIG. 5 of the above-mentioned Patent Document 1, when the electrode terminal and the FPC are connected by thermocompression bonding via an anisotropic conductive film, if the insulating sheet is thick and a flat pressure bonding head is used, the pressure bonding is performed. May be insufficient and the connection may be insufficient. In addition, if the crimping head is provided with a protrusion that matches the shape of the through hole of the insulating sheet, a crimping head is prepared for each panel size with a different number of electrodes, which may increase costs or adjust positioning. It becomes an obstacle to productivity.

  In Patent Document 2, the insulating layer is formed on the electrode terminals by a printing method because the electrode terminals arranged densely cause a positional deviation when the film thickness is increased or a deterioration in accuracy at the time of high definition. It is easy and the yield may decrease.

  On the other hand, in the technology disclosed in Patent Document 4 in which wiring resistance is provided to protect element destruction of a drive circuit caused by abnormality of the self-luminous flat display panel, the film thickness of the wiring resistance is not described. Even if a resistive metal film is formed by, for example, it is about several μm at most from the viewpoint of cost, the thin film wiring resistance cannot withstand the charge amount (energy) at the time of abnormality, and the thin film wiring resistance may melt and break. is there.

  The present invention has been made in view of the above circumstances, and a first object thereof is to make the conductor exposed portions of each electrode terminal of the electrode terminal row provided at the edge of the flat display panel have a staggered shape. Thus, it is an object of the present invention to provide a flat panel display device having an electrode terminal connection structure that can maintain a good yield and ensure connection reliability while reducing the risk of electrical short circuit.

  A second object is to provide a self-luminous flat panel display device having an electrode terminal connection structure that can reduce the risk of disconnection of wiring resistance caused by abnormality of the self-luminous flat panel display.

In order to solve the above-mentioned problems, in the present invention, for the first object, pixels are configured in a two-dimensional manner between a pair of opposing glass substrates arranged to perform image display. A flat display panel having a plurality of electrode terminals arranged substantially parallel to a direction substantially orthogonal to the edge of the edge at the edge, a driving device for driving the flat display panel, and driving from the driving device In a flat display device comprising a wiring board that supplies and supplies signals to the electrode terminals of the flat display panel,
The wiring board connecting side surface of the arrayed electrode terminals is covered with a predetermined thickness, and an opening through which the wiring conductor of the electrode terminal is exposed for each of the electrode terminals in the covering region, the opening Comprises an insulating layer forming a staggered array of openings substantially along the side of the edge, and a conductive paste filled in the openings, and the electrode terminals corresponding to the openings through the conductive paste And a corresponding connection terminal of the wiring board. At this time, the insulating layer has a thickness of 5 to 30 μm. And in order to ensure the layer thickness of the said insulating layer, the said insulating layer is formed with a glassy dielectric material.

  That is, in the present invention, an anisotropic conductive film is not used, and the conductive paste is filled in the opening of the insulating layer having a sufficient layer thickness to form a joining means between the FPC and the panel electrode.

For the second object, the phosphor is excited in a sealed space in a vacuum atmosphere between a pair of opposing glass substrates and emits light, and the edge of the edge is A self-luminous flat display panel having a plurality of electrode terminals arranged substantially parallel to a direction substantially perpendicular to the side, a driving device for driving the self-luminous flat display panel, and a drive signal from the driving device. In a self-luminous flat panel display device including a wiring board connected to and supplied to the electrode terminals of the self-luminous flat panel panel,
The wiring board connecting side surface of the plurality of arranged electrode terminals is covered with a predetermined thickness, and an opening through which the wiring conductor of the electrode terminal is exposed for each of the electrode terminals in the covering region, the opening Comprises an insulating layer forming a staggered array of openings substantially along the side of the edge portion, and a resistive paste filled in the openings, and electrode terminals corresponding to the openings through the resistive paste And a corresponding connection terminal of the wiring board. The insulating layer has a thickness of 5 to 30 μm. Further, in order to ensure the thickness of the insulating layer, the insulating layer is formed of a vitreous dielectric. If comprised in this way, since the layer thickness of the said insulating layer is thick enough, the resistive paste used as resistance can endure the electric charge amount (energy) at the time of abnormality.

  According to the present invention, the reliability of the display device can be improved.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In all the drawings, parts common to the drawings are denoted by the same reference numerals, and once described, the repeated description of those parts is omitted.

  FIG. 1 is a top view of a schematic configuration showing the basic concept of the flat display device according to the first embodiment, and FIG. 2 is a cross-sectional view taken along the arrow 15 in FIG. FIGS. 1 and 2 show only the peripheral portions of the electrode terminals derived from the respective electrodes formed on the glass substrate of the self-luminous flat display panel and arranged on the edge of the glass substrate. The illustration of the thing is omitted.

  As is apparent from FIGS. 1 and 2, for example, a liquid crystal panel in which pixels are two-dimensionally formed between a first glass substrate 1 and a second glass substrate 2 that form a pair arranged opposite to each other. A direction in which an electrode terminal 5 drawn out from an electrode (not shown) of a flat display panel (not shown) such as a PDP or FED is substantially orthogonal to the edge 10 along the edge 10 at the edge of the first glass substrate 1 Are arranged in parallel with each other. The electrode terminal 5 includes a terminal whose tip is close to the side 10 (hereinafter referred to as a subscript a) and a terminal that is not (hereinafter referred to as a subscript b), and is alternately formed in a staggered manner along the side 10. ing. For convenience of explanation, each group of electrode terminals 5a and 5b is given a subscript number 1, 2,... In order from the top of FIG. 1, and an arbitrary one is shown with a subscript number i. .

An insulating layer 3 having an opening 4 that is a through hole is formed on the electrode terminals 5a and 5b. The opening 4 of the insulating layer 3 is provided for each of the electrode terminals 5a _i and 5b _{i so} that the electrode terminal tip conductors 6a _i and 6b _i at the tip of the electrode terminals 5a _i and 5b _i are exposed. Thus, two opening rows are formed, and the opening rows are alternately staggered.

  The insulating layer 3 is a dielectric layer formed by, for example, applying a glass paste using low melting point lead glass powder on the first glass substrate 1 on which the electrode terminals 5 are formed. Of course, when applying the glass paste, it goes without saying that the opening is masked.

As shown in FIG. 2, the conductive paste 7 is filled on the electrode terminal tip conductors 6a _i and 6b _i inside the opening 4, and the FPC 8 serving as a wiring board is provided thereon. Conductive electrode terminal tip conductors 6a _i , 6b _i and corresponding connection terminals 8b _i , 8a _{i of} FPC 8 (in FIG. 2, connection terminal 8a _i is hidden behind connection terminal 8b _i and is not shown) The conductive paste 7 can be easily connected by thermocompression bonding from the FPC 8 side using a flat head, for example, by a known technique.

As described above, since the connection structure between the electrode terminal 5 arranged on the first glass substrate 1 and the FPC 8 is configured, the electrode terminals 5a _i and 5b _i derived from the display panel (not shown) The electrode terminal tip conductor in the opening 4 can be connected to the corresponding connection terminals 8 b _i and 8 a _i of the FPC 8 through the conductive paste 7 in the opening 4.

In this case, as is clear from FIG. 1, between the electrode terminal tip conductor 6a _i of the electrode terminals 5a _i to expose the electrode terminal tip conductor 6b _i of the electrode terminal 5b _i which is exposed to adjacent between the electrode terminals in a staggered arrangement Since the pitch distance can be about twice as long and the gap is covered with the insulating layer 3, an electrical short circuit due to foreign matter can be reduced. Further, the distance between the electrode terminal tip conductors 6a of the adjacent electrode terminals 5a (for example, between 6a ₁ and 6a ₂ ) and the distance between the electrode terminal tip conductors 6b of the adjacent electrode terminals 5b (for example, between 6b ₁ and 6b ₂ ) are also electrode terminals. Since it can be about twice as long as the inter-pitch distance, and the gap is covered with the insulating layer 3, an electrical short circuit due to foreign matter can be reduced.

  Further, since the conductive paste is filled in the opening 4, the protrusion of the conductive paste from the opening 4 can be minimized, the position is not displaced, the yield is kept good, and the electrode terminal tip conductor in the opening 4 is provided. And the corresponding connection terminal of the FPC 8 can be reliably connected with high reliability.

  In order to ensure electrical connection, the thickness of the insulating layer 3 is desirably 5 to 30 μm. This film thickness can be easily realized by a known technique used for PDP or the like because the insulating layer 3 is made of a dielectric material obtained by firing glass paste. Therefore, the present invention can be suitably used for a PDP.

  Next, a second embodiment will be described.

  FIG. 3 is a cross-sectional view of a schematic configuration showing the basic concept of the self-luminous flat display device according to the present embodiment. In this embodiment, a self-luminous flat panel display such as PDP or FED is used as the flat display panel in FIGS. 1 and 2, and a material having a resistance component is used instead of the conductive paste 7 filled in the opening 4. It is filled with a conductive paste having a high resistivity (hereinafter referred to as “resistive paste”). Others are the same as those of the first embodiment, and elements having the same functions are denoted by the same reference numerals, and redundant description thereof is omitted.

In FIG. 3, in this embodiment, a resistive paste 70, which is a material having a resistance component, is used in place of the conductive paste 7 in the opening 4, so that it is derived from each electrode (not shown) of the self-luminous flat display panel. The electrode terminals 5a _i and 5b _i arranged at the edge are connected to the corresponding connection terminals 8b _i and 8a _{i of the} FPC 8 via the resistor R of the resistive paste 70 (in FIG. 3, the connection terminals 8a _i are Hidden behind the connection terminal 8b _i and not connected). The other connection terminal (not shown) of the FPC 8 is connected to a drive circuit (not shown).

  Therefore, the resistive paste 70 filled in the opening 4 with respect to, for example, an excessive current or an excessive voltage flowing into the drive circuit caused by an abnormality of the self-luminous flat display panel (an overload state such as abnormal discharge or electrode short-circuit). It can restrict | limit with the resistance R which has.

  As described in the first embodiment, since the insulating layer 3 is formed with a thickness of 5 to 30 [mu] m, which is a thick film region, the thickness of the resistive paste 70 should be equal to or greater than the thickness of the insulating layer. And can sufficiently withstand the amount of charge in an abnormal state. Thereby, it becomes possible to reduce the possibility of disconnection at the time of abnormality.

  In this example, since the resistance paste is used for the resistance, it is possible to easily realize various resistance values by changing the component ratio of the substance having resistance. Needless to say to have it.

The top view of schematic structure which shows the basic concept of the flat display apparatus by a 1st Example. FIG. 2 is a cross-sectional view taken along line 15 in FIG. 1. The cross-sectional view of schematic structure which shows the basic concept of the self-light-emitting type | mold flat display apparatus by a 2nd Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 1st glass substrate, 2nd glass substrate, 3 Insulating layer, 4 Opening, 5 Electrode terminal, 6 Electrode terminal tip conductor, 7 Conductive paste, 8 Flexible printed circuit board (FPC), 70 Resistive paste

Claims (8)

A display panel comprising first and second substrates and an electrode disposed between the first and second substrates;
Wiring means connected to a lead-out portion drawn from the first and second substrates of the electrode;
An insulating means having an opening that exposes a portion of the drawer and covering the drawer;
Drive means for driving a display panel by supplying a signal to the wiring means,
The display device according to claim 1, wherein the lead portion of the electrode and the wiring means are connected by disposing a conductive paste in an opening of the insulating means.   The display device according to claim 1, wherein a resistive paste including a material having a resistance component is disposed in the opening of the insulating unit instead of the conductive paste. Pixels are configured in a two-dimensional manner between a pair of opposing glass substrates arranged to face each other and display an image. The edges are arranged substantially in parallel in a direction substantially orthogonal to the sides of the edges. A display device comprising: a display panel having a plurality of electrode terminals; a drive device that drives the display panel; and a wiring board that supplies a drive signal from the drive device connected to the electrode terminals of the display panel. ,
The wiring board connecting side surface of the arrayed electrode terminals is covered with a predetermined thickness, and an opening through which the wiring conductor of the electrode terminal is exposed for each of the electrode terminals in the covering region, the opening Comprises an insulating layer that forms a staggered array of openings substantially along the side of the edge, and a conductive paste filled in the openings, and the electrode terminals corresponding to the openings through the conductive paste And a corresponding connection terminal of the wiring board.   The display device according to claim 3, wherein the insulating layer has a thickness of 5 to 30 μm.   The display device according to claim 3, wherein the insulating layer is made of a glassy dielectric. The phosphors are excited in a sealed space in a vacuum atmosphere between a pair of opposing glass substrates to emit light, and are arranged substantially parallel to the edge part in a direction substantially perpendicular to the side of the edge part. A self-luminous display panel having a plurality of electrode terminals, a driving device for driving the self-luminous display panel, and a drive signal from the driving device connected to the electrode terminals of the self-luminous display panel In a self-luminous display device comprising a wiring board to be
The wiring board connecting side surface of the plurality of arranged electrode terminals is covered with a predetermined thickness, and an opening through which the wiring conductor of the electrode terminal is exposed for each of the electrode terminals in the covering region, the opening Comprises an insulating layer forming a staggered array of openings substantially along the side of the edge portion, and a resistive paste filled in the openings, and electrode terminals corresponding to the openings through the resistive paste And a corresponding connection terminal of the wiring board.   The self-luminous display device according to claim 6, wherein the insulating layer has a thickness of 5 to 30 μm. The self-luminous display device according to claim 6, wherein the insulating layer is made of a glassy dielectric.

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