JP2005227435A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a connection failure, due to warpage of a printed circuit board (PCB), in which, on a main face formed by extending to one direction, the plurality of terminals are arranged in parallel to the direction, between a plurality of terminals of the PCB and terminals of the other printed circuit board and to prevent a short circuit between the plurality of terminals. <P>SOLUTION: In a display device which is equipped with a display panel PNL, a first circuit board PCB1 having the main face along an x-axis direction and a y-axis direction crossing the x-axis and a second circuit board FPC1 which is electrically connected to a plurality of terminals d(p) arranged to the x-axis direction in line on the main face of the first circuit board, and in which the main face of the first circuit board PCB1 is formed by extending long to the x-axis direction, each terminal d(p) of the first circuit board PCB1 is extended longer to the y-direction than connection terminals TERa connected to d(p), of the second circuit board FPC1 and spacings Sp, Sp' and Sp" with which each adjoining pair of the terminals d(p) is separated are expanded at both ends of the terminals d(p). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a so-called flat display device (abbreviated as Flat Panel Display, FPD) such as a liquid crystal display device, an electroluminescence display device, a field emission display device, and the like, and in particular, a plurality of printed circuits on a display panel. The present invention relates to a connection structure between printed circuit boards suitable for a display device in which substrates are connected in series and power or signals are supplied to the display panel through the printed circuit boards.

  An example of a display device (display module) known as a so-called flat display device such as a liquid crystal display device, an electroluminescence display device, or a field emission display device is shown in FIG. An example of this display device is depicted in FIG. 1 according to a liquid crystal display device disclosed in Patent Document 1 described later.

  The display panel PNL shown in FIG. 1 has a pair of substrates SUB1 and SUB2 (at least one of which is a transparent substrate made of a material that can sufficiently transmit light) bonded to each other, and the substrate SUB1. , SUB2 is formed by sealing a liquid crystal composition. The display panel PNL has a pair of opposing sides (extending along the x-axis of the orthogonal coordinates shown in FIG. 1) and a direction intersecting one of the pair of sides (the y-axis of the orthogonal coordinates shown in FIG. 1). And a pair of other sides extending in a direction). Each of one of the pair of sides (upper side in FIG. 1) and one of the other pair of sides (right side in FIG. 1) of the display panel PNL includes printed circuit boards PCB1, PCB2 (Printed Circuit Board, One of a plurality of flexible printed circuit boards FPC1, FPC2 (abbreviated as Flexible Printed Circuit Board, FPC, hereinafter also referred to as a first circuit board). A signal (a signal for controlling image data and its display) and electric power are supplied via.

  On the first circuit board PCB1, a control circuit board CTB (Control Circuit Board) on which a display control circuit Tcon (an integrated circuit element also called a timing controller) and various electronic components Ecom are mounted is a jumper. Connected through JMP1. The control circuit board CTB is also called an interface circuit board because it receives video data and a control signal necessary for displaying the video data from outside a so-called display device such as a computer or a television system. Supply of a signal or power from the first circuit board PCB1 to the upper side of the display panel PNL is performed by electrically connecting one end of each of the plurality of second circuit boards FPC1 to an input unit SIGIN1 formed on the upper side of the display panel PNL. The other end of each second circuit board FPC1 is electrically connected to a plurality of terminals formed in the connection area CNA1 on the main surface of the first circuit board PCB1. The main surface of the first circuit board PCB1 extends along the x direction and the y direction.

 The first circuit board PCB1 is also connected to the second circuit board PCB2 through the jumper JMP2, and distributes signals and power received from the control circuit board CTB to the second circuit board PCB2. To supply a signal or power from the second circuit board PCB2 to the right side of the display panel PNL, electrically connect one end of each of the plurality of second circuit boards FPC2 to an input part SIGIN2 formed on the right side of the display panel PNL. The other end of each second circuit board FPC2 is electrically connected to a plurality of terminals formed in the connection area CNA2 on the main surface of the first circuit board PCB2. The electrical connection between the first circuit board PCB1 and the plurality of second circuit boards FPC1 is based on an alignment mark ALM1 formed on the main surface of the first circuit board PCB1. This is performed by aligning the other end of each and the terminals formed in the connection region CNA1. Similarly, the electrical connection between the first circuit board PCB2 and the plurality of second circuit boards FPC2 is also based on the alignment mark ALM2 formed on the main surface of the first circuit board PCB2. This is performed by matching the positions of the other ends of the FPC 2 and the terminals formed in the connection area CNA2.

  Electrical connection between the first circuit board PCB1 (its connection area CNA1) and the plurality of second circuit boards FPC1 and electrical connection between the first circuit board PCB2 (its connection area CNA2) and the plurality of second circuit boards FPC2 Details of the connection will be described with reference to FIG. 2, taking as an example a connection structure between the other end of the second circuit board FPC1 and the first circuit board PCB1 shown in the region 2a of FIG. A second circuit board FPC1 shown in FIG. 2A is a TCP (Tape Carrier Package) or COF (Chip On Film) on which a display panel driver element IC1 is mounted by a so-called TAB (Tape Automated Bonding) technique. ).

 As is clear from FIG. 2A and FIG. 2B in which the cross section of the region 2b shown therein is drawn, the second circuit board FPC1 is made of an insulating base film (Base Film) BSF (f). A plurality of wirings d (f) made of a conductor film formed on the main surface (also serving as a main surface of the second circuit board FPC1), and an insulating film INS (f) covering the plurality of wirings d (f) Including. The plurality of wirings d (f) are exposed from the insulating film INS (f) at one end and the other end of the second circuit board FPC1 and used as the connection terminals TERa and TERb.

  On the other hand, as shown in FIG. 2B, the first circuit board PCB1 has an insulating base member (Base Member) BSF (p) on its main surface (which also serves as the main surface of the first circuit board PCB1). A plurality of wirings d (p) made of the formed conductor film and an insulating film INS (p) covering the plurality of wirings d (p) are included. In contrast to the base film BSF (f) of the second circuit board FPC1 molded only with the resin, the base material BSF (p) of the first circuit board PCB1 is firmly molded with glass fiber or the like immersed in the resin. The insulating film INS (p) may be formed of a thin film of a resin or an inorganic material like the insulating film INS (f) of the second circuit board FPC1, but a thicker solder resist (Solder Resist) film is used. It may be replaced. In the connection region CNA1, an opening extending in the x direction is formed in the insulating film INS (p), and a plurality of wirings d (p) exposed from the opening are used as a plurality of terminals of the first circuit board PCB1. It is electrically connected to a connection terminal TERa provided at the other end of the two-circuit board FPC1. The plurality of terminals of the first circuit board PCB1 and the connection terminals TERa of the second circuit board FPC1 are electrically connected by an anisotropic conductive film ACF as shown in FIG. The

 In FIG. 2A, the outlines of the plurality of wirings d (p) formed on the first circuit board PCB1 are formed on the second circuit board FPC1 in the connection area CNA1 and on the insulating film INS in the other areas. Since they are respectively covered by (p), they are indicated by broken lines. FIG. 2C shows another cross-sectional structure of the first circuit board PCB1 following FIG. In the first circuit board PCB1 shown in FIG. 2C, a plurality of wirings are provided on the back surface of the insulating base material BSF (p) (another main surface facing the main surface of the first circuit board PCB1). d (p) is formed, and another conductor layer d2 (p) is formed on the main surface of the insulating base material BSF (p) as a plurality of terminals electrically connected to the connection terminal TERa. Each of the plurality of wirings d (p) is electrically connected to the corresponding conductor layer d2 (p) through a through hole TH that penetrates the base material BSF (p) in the connection region CNA1. The plurality of wirings d (p) formed on the back surface of the insulating base material BSF (p) are covered with the insulating film INS (p).

The display device described above is based on the liquid crystal display device disclosed in Patent Document 1 described below, and includes some improvements. The components are an electroluminescence display device and a field emission display. The present invention can also be used for display devices other than liquid crystal display devices such as devices.
JP 05-257142 (corresponding US Pat. No. 5,432,626)

  As described with reference to FIGS. 1, 2B, and 2C, the first circuit board PCB1 has a first direction (for example, an x-axis) and a second direction (for example, an x-axis) that intersects the first direction (for example, , A main surface along the y-axis orthogonal to the x-axis), and a plurality of terminals electrically connected to the second circuit board FPC1 are arranged in parallel in the first direction (for example, the x-axis) on the main surface. Thus, the connection area CNA1 is formed. The first circuit board PCB1 extends along the first direction (for example, the x axis). Further, the thickness of the first circuit board PCB1 is orthogonal to the third direction (for example, the x-axis and the y-axis) that intersects each of the first direction (for example, the x-axis) and the second direction (for example, the y-axis). Along the z axis). Therefore, as shown in FIG. 3A, the dimension (length) Px along the first direction, the dimension (width) Py along the second direction, and the dimension (thickness along the third direction) of the first circuit board PCB1. P) Pz (not shown) has a relationship of Px> Py> Pz.

 On the other hand, the plurality of terminals arranged in parallel in the connection region CNA1 extending along the first direction (for example, the x-axis) are anisotropic conductive films ACF extending along the first direction (for example, the x-axis). The connection terminal TERa of the second circuit board FPC1 is covered with the anisotropic conductive film ACF and is thermocompression bonded. When the first circuit board PCB1 has slight protrusions and depressions in the first direction, the second direction, and the third direction, the above Px is described as the maximum length, Py is the maximum width, and Pz is the maximum thickness. The The shape of the first circuit board PCB2 and the connection form with the second circuit board FPC2 are the same as those of the first circuit board PCB1 by replacing the first direction with the y-axis and the second direction with the x-axis. Explained.

  The inventor has found a problem that the center of the first circuit board PCB1 is warped in the second direction (shown as the y-axis) as shown in FIGS. 3B and 3C. The problem is that the dimension (thickness) Pz along the third direction of the first circuit board PCB1 is smaller than the other dimensions Px (length) and Py (width), in other words, the first circuit board PCB1. Becomes more apparent as it becomes thinner, and becomes longer along the first direction (shown as the x-axis) with respect to the dimension Py (width) along the second direction (y-axis). In the case of (1) shown in FIG. 3B, the center of the first circuit board PCB1 is warped in the positive direction of the y-axis. As shown in FIG. 1, since the second circuit board FPC1 connected to the connection area CNA1 extends in the negative direction of the y axis and is connected to the display panel PNL, the first circuit board PCB1 in the case of (1) The warp is also described as “a warp opposite to the display panel PNL”. In the case of (2) shown in FIG. 3C, since the center of the first circuit board PCB1 is warped in the negative direction of the y-axis, it is also referred to as “warping toward the display panel PNL”.

 In the step of connecting the connection terminal TERa of the second circuit board FPC1 to the connection area CNA1 of the first circuit board PCB1, the tape-like anisotropic conductive film ACF extending along the first direction (x-axis) is aligned with the alignment mark ALM1. When the warp of the first circuit board PCB1 in the case (1) occurs when arranging in the connection region CNA1 with reference to FIG. 6, the anisotropic conductive film ACF is negative in the y-axis from the connection region CNA1 in the center of the connection region CNA1. The direction is shifted (toward the display panel PNL). Further, when the warp of the first circuit board PCB1 in the case (2) occurs, the anisotropic conductive film ACF is in the positive direction of the y axis from the connection region CNA1 in the center of the connection region CNA1 (the direction opposite to the display panel PNL). Sneak away. In any case, the plurality of terminals provided on the first circuit board PCB1 are not sufficiently covered with the anisotropic conductive film ACF at the center of the connection region CNA1.

  Further, in the state shown in FIG. 3B, the second circuit board PCB1 is warped (the warp in the direction opposite to the display panel PNL) in the first circuit board PCB1 in the case (1), and the second circuit area is connected to the connection area CNA1 of the first circuit board PCB1. A problem when the connection terminal TERa of the circuit board FPC1 is thermocompression bonded will be described with reference to FIG. 4A, the connection terminal TERa of the second circuit board FPC1 is negative in the y axis with respect to the connection area CNA1 of the first circuit board PCB1. The direction is shifted (toward the display panel PNL). The connection area (area along the plane consisting of the x-axis and the y-axis) between the connection terminal TERa and the connection region CNA1 (d (p) serving as the terminal of the first circuit board PCB1) in this region 4b is shown in FIG. As shown in FIG. 2, it is narrower than that described with reference to FIG.

 For example, the terminal d (p) of the first circuit board PCB1 and the connection terminal TERa of the second circuit board FPC1 are electrically connected at both ends of the connection area CNA1 as shown in FIG. If the terminal d (p) of the board PCB1 and the connection terminal TERa of the second circuit board FPC1 are electrically connected as shown in FIG. 4B, they are transmitted from the first circuit board PCB1 to the second circuit board FPC1. The electrical resistance experienced by the signal differs between both ends of the connection region CNA1 and the central portion thereof. Therefore, when the same signal is output from the first circuit board PCB1 to the second circuit board FPC1 at both ends and the center of the connection area CNA1, the signal received by the connection terminal TERa connected to the center of the connection area CNA1. The signal is different from the signal received at the connection terminal TERa connected to the end of the connection region CNA1, and the circuit of the driving element IC1 mounted on the second circuit board FPC1 and the display panel PNL receiving the signal therefrom Is recognized.

  The present inventor provides a display device as described below in order to solve the above-described warpage of the first circuit board PCB1 and various problems caused by the warp. The display device according to the present invention is characterized in that a terminal formed on the first circuit board and connected to the connection terminal of the second circuit board FPC1 is formed longer than the connection terminal. The typical structure is as follows.

The display device 1 has a main surface along a display panel, a first direction (for example, x-axis) and a second direction (for example, y-axis orthogonal to the x-axis) intersecting the first direction, and the main surface Is a first circuit board in which a plurality of terminals extending in the second direction are arranged in parallel in the first direction, and one end is electrically connected to the display panel and the other end is electrically connected to the plurality of terminals of the first circuit board. At least one second circuit board, and the adjacent pairs of the plurality of terminals are separated from each other at both ends more widely than between the both ends.

 Display device 2: In display device 1, the main surface of the first circuit board extends longer along the second direction (for example, the y-axis) than along the first direction (x).

 Display device 3: In display device 1, a plurality of second circuit boards are arranged in parallel along the first direction on the first circuit board, and the plurality of terminals of the first circuit board are arranged in the first direction ( For example, it is divided into a plurality of groups corresponding to each of the plurality of second circuit boards along the x-axis) and electrically connected to the second circuit boards corresponding to each of the plurality of groups.

 Display device 4: In display device 3, the display panel has a pair of opposing sides (for example, extending in the x-axis direction) and another pair of sides extending in a direction intersecting one of the pair of sides. (E.g., extending in the y-axis direction), and the plurality of second circuit boards are formed on any one of the pair of sides and the other pair of sides of the display panel. It is installed side by side.

Display device 5: In the display device 3, a driving circuit element of the display panel is mounted on each of the plurality of second circuit boards.

 Display device 6: In display device 1, a region (connection region) in which the plurality of terminals are arranged in parallel in the first direction (for example, the x axis) on the main surface of the first circuit board is the second device. It extends longer along the first direction than the direction (for example, the y-axis).

 Display device 7: In display device 6, the width along the second direction (for example, the y-axis) of the region where the plurality of terminals are arranged in parallel is electrically connected to the plurality of terminals of the second circuit board. Wider than the width of the other end along the second direction.

 Display device 8: In the display device 7, the first circuit board and the second circuit board electrically connected thereto are arranged in the first direction (for example, the x axis) and the second direction (for example, the y axis). ) In the third direction (for example, the z-axis orthogonal to the x-axis and the y-axis), and the second circuit board is flexible.

 The display device 9 has: a main surface along a display panel, a first direction (for example, x-axis) and a second direction (for example, y-axis orthogonal to the x-axis) intersecting the first direction, and the main surface Is a first circuit board in which a plurality of terminals extending in the second direction are formed side by side in the first direction, and one end is electrically connected to the display panel and the other end is electrically connected to the plurality of terminals of the first circuit board. At least one second circuit board to be connected, and the other end of the second circuit board is connected to one of the plurality of terminals of the first circuit board and connected to the one terminal. In this state, a connection terminal extending along the second direction is formed, and the length of the one terminal of the first circuit board extending along the second direction is longer than that of the connection terminal of the second circuit board. The width of the one terminal along the first direction is the one terminal It is narrowed as compared with the portion between the ends at both ends of the child.

 Display device 10: In display device 9, the plurality of terminals formed on the main surface of the first circuit board are a part of a plurality of wirings formed as a conductor layer on the first circuit board main surface. And it is exposed from the opening formed in the insulating film which covers a some wiring in the said 1st circuit board main surface.

 Display device 11: In the display device 10, the opening of the insulating film is formed to extend longer along the first direction (for example, the x axis) than the second direction (for example, the y axis). The length along the second direction of the plurality of terminals arranged side by side is determined by the width along the second direction of the opening.

 The display device 12: In the display device 11, the other end of the second circuit board is connected to the plurality of terminals of the first circuit board arranged in the opening of the insulating film, respectively. Connection terminals are juxtaposed.

 Display device 13: In display device 9, said portion formed between said both ends of said one terminal of said first circuit board (that is, a width along a first direction (eg, x-axis) from said both ends) The length along the second direction (for example, the y-axis) of the wide portion of the second circuit board is shorter than that of the connection terminal of the second circuit board connected to the one terminal.

 Display device 14: In display device 9, the connection terminal of the second circuit board is an insulation covering the conductor layer at the other end of the second circuit board of the conductor layer formed on the main surface of the second circuit board. The part exposed from the film.

  In both the display device 1 and the display device 9 described above, each of the plurality of terminals formed on the first circuit board is in the second direction (more than the connection terminal of the second circuit board connected thereto). For example, since it extends long along the y-axis), even if the center of the first circuit board is warped along the second direction, each of the plurality of terminals and the connection terminals at the center of the first circuit board and both ends thereof The difference in the electrical connection state is sufficiently suppressed. Furthermore, in the display device 1, the dimension of separating adjacent pairs of the plurality of terminals along the first direction (for example, the x axis) is widened at both ends of the terminal, and the display device 9 Narrowing the dimension along each first direction (in other words, the width of the terminal) at both ends of the terminal solves a new problem associated with extending the plurality of terminals along the second direction. Is done. This new problem is a short circuit between terminals that occurs when a pair of adjacent ends of the plurality of terminals are not connected to the connection terminals of the second circuit board, and details thereof will be described later as a comparative example of the present invention. .

  The display device according to the present invention is not limited to the 14 types of structures exemplified above, and can be variously modified without departing from the technical idea thereof.

  Hereinafter, before explaining the best mode of the display device according to the present invention, the display device studied in the process of conceiving the display device by the present inventor is used as a comparative example, and the first circuit board employed in the display device is used as a comparative example. Description will be made including the problem of the short circuit between the terminals of the first circuit board.

[Comparative Example]
The first circuit board PCB1 shown in FIG. 5A is second in the connection area CNA1 (area where a plurality of terminals are arranged in parallel) formed on the main surface of the first circuit board PCB1 described in the background art. FIG. 5B shows the circuit board FPC1 connected, and the center of the first circuit board PCB1 shown in FIG. 5A is the positive direction of the y-axis (display panel PNL) as shown in FIG. 3B. Is the opposite direction). The width (dimension in the x-axis direction) of the connection region CNA1 shown in FIG. 5A: Y (CNA) is the second circuit in which the connection terminal TERa connected to the connection region CNA1 is formed for the sake of drawing. The width of the end portion of the substrate FPC1 (in other words, the length of the connection terminal TERa) Y [TERa] is drawn wider, but as described with reference to FIG. Equal to Y [TERa]. Note that the problem of electrical connection between the terminal d (p) of the first circuit board PCB1 and the connection terminal TERa described above with reference to FIG. 4B is surrounded by a broken line frame in FIG. 5B. It occurs in region 4b. Y (ACF) is the width of the anisotropic conductive film ACF.

  As shown in FIG. 5C, the inventor forms a connection region CNA1 having a width Yb (CNA) wider than the width Y [TERa] of the end of the second circuit board FPC1 on the main surface of the first circuit board PCB1. Then, an attempt was made to solve the above problem. The width Yb (CNA) of the connection region CNA1 formed on the first circuit board PCB1 prototyped by the present inventor is the first width (connection terminal length) Y [TERa] of the second circuit board FPC1. The value obtained by adding the length obtained by double the size of the circuit board PCB1 warping along the y-axis is set to be larger than that. For example, at least 1.2 times the width Y [TERa] of the end portion of the second circuit board FPC1 (preferably 1.5 times or more). For example, in the prototype of the first circuit board PCB1 having a cross-sectional structure as shown in FIG. 2B, FIG. 5 () having a width Y (CNA) determined in accordance with Y [TERa] = 1.2 mm. In contrast to the connection area CNA1 shown in A), the connection area CNA1 shown in FIG. 5C is extended along the y-axis direction by 0.4 mm at both ends. Therefore, the width Yb (CNA) is 2.0 mm, which is about 1.7 times the width Y (CNA) of 1.2 mm shown in FIG.

 The planar structure and the cross-sectional structure of the connection region CNA1 in this prototype are shown enlarged in FIGS. 6 (A) and 6 (C). As shown in FIGS. 6A and 6C, the connection region CNA1 shown in FIG. 5C has a conductor layer d () formed on the base material BSF (p) of the first circuit board PCB1. p) is formed as an opening of the insulating film INS (p) covering the second circuit board FPC1 with the conductor layer d (p) exposed from the opening as “a plurality of terminals formed on the first circuit board PCB1”. It is used for connection with the connection terminal. The width (dimension in the x-axis direction) Wp of each of the conductor layer d (p) exposed from the opening of the insulating film INS (p), that is, the “plurality of terminals formed on the first circuit board PCB1,” is 0.5 mm. The interval Sp separating the adjacent pairs in the x-axis direction is 0.5 mm.

  The first circuit board PCB1 shown in FIG. 5C in which the width Yb (CNA) of the connection region CNA1 is wider than the width Y [TERa] of the end portion of the second circuit board FPC1 is adopted, not limited to the prototype described above. As a result, even when the center of the first circuit board PCB1 is warped in the positive direction of the y-axis as shown in FIG. 5D, its end (the region 6a surrounded by a broken line) and its center (enclosed by a broken line). The difference in the electrical connection state between the terminal of the first circuit board PCB1 and the connection terminal of the second circuit board FPC1 in the region 6b) can be eliminated. Such an effect can be obtained even when the center of the first circuit board PCB1 is warped in the negative direction of the y-axis. However, a new problem arises because the portion of the terminal of the first circuit board PCB1 is not connected to the connection terminal of the second circuit board FPC1. The new problem that occurs in the region 6a of FIG. 5D is described with reference to FIGS. 6A and 6C, and the new problem that occurs in the region 6b of FIG. Each will be described with reference to FIG.

  In the region 6a of FIG. 5D, as shown in FIG. 6A, the length (dimension in the y-axis direction) formed at the end portion of the second circuit board FPC1 is Y [TERa]. f) in the connection area CNA1, the position connected to the terminal d (p) of the first circuit board PCB1 whose length (dimension in the y-axis direction) is Yb (CNA) is the positive direction in the y-axis (display panel PNL). The opposite direction). Accordingly, the display panel PNL side of the terminal d (p) of the first circuit board PCB1 is not connected to the connection terminal d (f), but is covered with the second circuit board FPC1. However, in the step of connecting the end of the second circuit board FPC1 to the connection region CNA1 of the first circuit board PCB1, the conductive particles PAR drifting in the atmosphere are displayed on the terminals d (p) of the first circuit board PCB1. It adheres to the panel PNL side and is pressed between a pair of adjacent terminals d (p) of the first circuit board PCB1 by thermocompression bonding of the second circuit board FPC1 (see FIG. 6C). For this reason, the pair of terminals d (p) are conducted by the conductive particles PAR. In addition, fine particles such as dust generated from a metal member holding the display device assembled as shown in FIG. 1 or metal contained in an atmosphere in which the display device is used may adhere as conductive particles PAR. .

  On the other hand, in the region 6b of FIG. 5D, as shown in FIG. 6B, the connection terminal d (f) of length Y [TERa] formed at the end of the second circuit board FPC1 is connected to the connection region. In CNA1, the position connected to the terminal d (p) of the first circuit board PCB1 having the length Yb (CNA) is biased in the negative y-axis direction (close to the display panel PNL). Accordingly, the portion of the terminal d (p) of the first circuit board PCB1 opposite to the display panel PNL (the portion with the hatched pattern in FIG. 6B) is covered with the second circuit board FPC1. It ’s exposed. Accordingly, the process of connecting the end portion of the second circuit board FPC1 to the connection region CNA1 of the first circuit board PCB1 or the display device is completed as shown in FIG. In the process of storing in the “frame”), the conductive particles PAR floating in the atmosphere adhere to a portion of the terminal d (p) of the first circuit board PCB1 that is not covered by the second circuit board FPC1 (FIG. 6D )), And electrically shorting a pair of adjacent terminals d (p) of the first circuit board PCB1.

  The short circuit due to the conductive particles PAR described above occurs not only in the assembly process of the display device but also after it is shipped as a product. Therefore, the design of the connection region CNA1 of the first circuit board PCB1 is not limited to the conductive circuit PAR. Care must be taken in preparation for the unexpected adhesion of the particles PAR. In view of such a situation, the inventor made a prototype of a new first circuit board PCB1 described below, and the terminal d described above even when the conductive particles PAR adhere to the connection region CNA1 of the first circuit board PCB1. Solved the short circuit problem between (p).

  FIG. 7A schematically illustrates the planar structure of the connection region CNA1 of the novel first circuit board PCB1 that characterizes the display device according to the present invention, following FIGS. 6A and 6B. ing. In FIG. 7A, the length Lp corresponds to the width of the connection region CNA1 formed on the first circuit board PCB1 shown in FIG. In FIG. 7A, the extension length of the connection region CNA1 in the first circuit board PCB1 in FIG. 5C described above toward the display panel PNL side (the negative direction of the y-axis) is Lp1, and what is the display panel PNL? The extending length in the opposite side (positive direction of the y-axis) corresponds to Lp2. Therefore, Yb (CNA) shown in FIGS. 5C and 6A to 6D is the sum of Lp, Lp1, and Lp2. In FIG. 7A, the outline of the conductor layer d (p) serving as the terminal of the first circuit board PCB1 is indicated by a solid line in the connection region CNA1 and by a broken line in a region covered with the insulating film INS (p). Each is shown. Further, the widths (dimensions in the x-axis direction) Wp1 and Wp2 of the conductor layer d (p) at both ends of the connection region CNA1 are larger than the width Wp of the portion sandwiched between the both ends (for example, the central portion of the connection region CNA1). It is narrowed. Therefore, the distances Sp ′ and Sp ″ separating the adjacent pairs of the conductor layers d (p) at both ends of the connection region CNA1 are the portions between the both ends (for example, the central portion of the connection region CNA1). Since the distance Sp is greater than the distance Sp separating the layers d (p), the connection region in FIG.7 (A) is larger than the conductor layer d (p) shown in the connection region CNA1 in FIG.6 (A) and FIG.6 (B). The conductor layer d (p) shown in CNA1 is characterized in that a first portion, a second portion, and a third portion having different widths are sequentially formed in the positive direction of the y-axis. In the layer d (p), the width Wp1 of the first portion, the width Wp of the second portion, and the width Wp2 of the third portion satisfy the relationship of Wp> Wp1, and Wp> Wp2. When focusing on p), the distance (distance) at which these first parts are separated in the x-axis direction. p ′, an interval (distance) Sp at which these second portions are separated in the x-axis direction, and an interval Sp ″ at which these third portions are separated in the x-axis direction are Sp <Sp ′ and Sp <Sp ″. Satisfy the relationship.

  In the first circuit board PCB1 prototyped in consideration of the present embodiment with respect to the prototype illustrated above, the width Wp1 of the first portion and the width Wp2 of the third portion are set to 0.25 mm, and the second portion The width Wp was 0.5 mm. An interval Sp ′ separating the first portion and an interval Sp ″ separating the third portion of a pair of adjacent conductor layers d (p) is 0.75 mm, and the interval Sp separating the second portion is 0.5 mm. The lengths of Lp1, Lp, and Lp2 are 0.4 mm, 1.2 mm, and 0.4 mm, as in the previous prototype, but the length of the second portion (dimension in the y-axis direction) is Lp. Therefore, in Fig. 7B showing the cross-sectional structure of Fig. 7A, the length Ye1 of the first portion, the length Yc of the second portion, and the length Ye2 of the third portion are Ye1. > Lp1, Yc <Lp, Ye2> Lp2, Ye1> Yc, and Ye2> Yc, and a conductor layer d (p) extending from the end of the connection region CNA1 to be covered with the insulating film INS (p). Is formed at the end of the connection region CNA1 as shown in FIG. The conductor layer width d (p) (e.g., Wp2) may be wider than (e.g., spread width Wp).

  On the other hand, the outline of the connection terminal d (f) of the second circuit board connected to the terminal formed on the first circuit board PCB1 of the present embodiment is the four terminals d () shown in FIG. The portion of the length Y [TERa], which is indicated by broken lines drawn on two inner sides of p) and extends from the end along the y axis, serves as a connection terminal to the terminal d (p) of the first circuit board PCB1. Connected. In addition, one of the left ends of the four terminals d (p) shown in FIG. 7A has the outline of the connection terminal of the second circuit board that is connected with the largest displacement in the positive direction of the y-axis. The outline of the connection terminal of the second circuit board connected with the largest shift in the negative direction of the y-axis is indicated by a dashed-dotted line frame d (f) ′. The outlines d (f) ′ and d (f) ″ of these connection terminals show only the part that is actually connected to the terminal d (p) of the first circuit board PCB1. Contour d (f) with respect to the connection terminal indicated by the broken line connected to the two inside terminals (parts of the length Lp thereof) of the four terminals d (p) shown in FIG. The connection terminal of the second circuit board indicated by 'is shifted by the distance TER (+ y) in the positive direction of the y axis, and the connection terminal of the second circuit board indicated by the outline d (f) " The distance TER (−y) is shifted in the negative direction.

  The width Wf of the connection terminal of the second circuit board connected to the terminal of the first circuit board PCB1 prototyped according to the present embodiment is 0.5 mm, and a pair of adjacent connection terminals are separated in the x-axis direction. The distance (interval) Sf is 0.5 mm. The length (dimension in the y-axis direction) Y [TERa] of the connection terminal of the second circuit board shown in FIG. 7A is 1.2 mm, and the terminal d (p) formed on the first circuit board PCB1 Of the first circuit board PCB1 is connected to a part intended for the design (a part corresponding to the length Lp, hereinafter also referred to as a design area). Therefore, the extension portion corresponding to the length Lp1 when the connection with the connection terminal of the second circuit board is shifted in the positive direction of the y axis and the extension portion corresponding to the length Lp2 when the connection to the connection terminal of the second circuit board is shifted in the negative direction of the y axis. In this case, there is a possibility that the conductive particles PAR shown in FIGS. 6A and 6B adhere. However, the distances Sp ′ and Sp ″ separating the pair of terminals d (p) adjacent to each other at the extended portions with respect to the conductive particles PAR indicated by the broken lines in FIG. Therefore, the conductive particles PAR that are in contact with one of the pair of terminals d (p) cannot be in contact with the other, and the conductive particles that can adhere to the terminals of the first circuit board PCB1. Since there is a practical upper limit to the size of the active particles PAR, a short circuit between the terminals d (p) of the first circuit board PCB1 is increased by increasing the distance separating the pair of terminals d (p) at each extension portion. The probability of occurrence is significantly reduced.

  In the present embodiment, as shown in FIG. 7A, the width of the terminal d (p) arranged in parallel with the connection region CNA1 of the first circuit board PCB1 is also reduced in the design region. Therefore, when the connection terminal of the second circuit board is connected to the terminal d (p) in the design area as intended by the designer, it is expected that the electrical resistance between them will increase. However, as shown in FIG. 7B, the connection terminal d (f) (a part of the conductor layer) whose length in the y-axis direction is Y [TERa] (part of the conductor layer) has a design region whose length in the y-axis direction is Lp. The center is shifted to either the positive direction of the y-axis or the negative direction of the y-axis. Accordingly, when the displacement amount TER (+ y) in the positive direction of the y axis and the displacement amount TER (−y) in the negative direction of the y axis are equal to or less than half of Lp, the terminal d (p) formed in the design region. When the length Yc of the wide part (the second part) is smaller than Lp, the connection terminal d (f) shifted in the positive direction of the y axis and the connection terminal d (f) shifted in the negative direction of the y axis Are connected to the second portion of the terminal d (p). Therefore, even if the first circuit board PCB1 of this embodiment is warped as shown in FIG. 5D, the region between the terminal d (p) formed on the first circuit board PCB1 and the connection terminal d (f) of the second circuit board. It becomes easy to make the electrical connection conditions in 6a and 6b and the electrical connection state of the design region of the terminal d (p) and the connection terminal d (f) of the second circuit board outside these regions. In addition, since the second portion of the terminal d (p) is within the design area, the first circuit board described above can be used regardless of whether the connection terminal d (f) is greatly displaced in the positive or negative direction of the y-axis. The possibility of a short circuit occurring between the terminals d (p) of the PCB 1 is further suppressed.

  This effect will be described with reference to the connection between the first circuit board PCB1 prototyped according to the present embodiment and the second circuit board FPC1 connected to the terminal (connection area CNA) formed thereon. Then, in the y-axis direction, a portion having a length Lb = 1.2 mm, an extending portion having a length Lp1 = 0.4 mm extending from one end thereof in the negative direction of the y-axis, and a length extending from the other end in the positive direction of the y-axis. The terminal d (p) consisting of an extension of length Lp2 = 0.4 mm has a maximum length of Y [TERa] = 1.2 mm connecting terminal d (f) connected thereto along the negative direction of the y-axis. It is allowed to deviate by TER (−y) = 0.4 mm and to deviate by maximum TER (+ y) = 0.4 mm along the positive direction of the y-axis. This case will be described with reference to FIG. 7A. The connection terminal contour d (f) ′ of the second circuit board that is most greatly shifted (shifted) in the positive direction of the y-axis and the negative direction of the y-axis. Any of the connection terminals d (f) ″ of the second circuit board that is displaced the most toward the terminal overlaps the design area of the terminal d (p) by 0.8 mm. For this reason, in the design area, the former connection terminal d (F) ′ and the latter connection terminal d (f) ″ overlap each other with a length of 0.4 mm. Therefore, if the length Yc of the second portion of the terminal d (p) is 0.4 mm, the length Ye1 of the first portion and the length Ye2 of the third portion are 0.8 mm, respectively, the terminal d (p ) In the connection terminal d (f) of the second circuit board that is accurately connected to the design area of the second circuit board, the conduction condition between the connection terminal d (p) and the connection terminal d (f) is greatly shifted in the y-axis direction. The first circuit board PCB1 of the present embodiment is connected to the terminal d (p) connected to the connection terminal d (f) ′ connected to d (p) and the connection terminal d (f) ″. The connection terminal d (f) of the second circuit board is designed so that the position of the connection terminal d (f) of the two circuit boards may be shifted by the same degree in each of the positive and negative directions of the y-axis. When the position of the first portion is likely to be shifted toward either the positive direction or the negative direction of the y-axis, the length Y of the first portion It is desirable made different 1 and the third portion length of Ye2.

  When the dimension of the terminal d (p) of the first circuit board PCB1 described in this embodiment is compared with the dimension of the connection terminal d (f) of the second circuit board, the length of the second portion of the terminal d (p) The length Yc (dimension in the y-axis direction) is preferably smaller than the length Y [TERa] of the connection terminal d (f), and its width (dimension in the x-axis direction) Wp is a pair of adjacent connection terminals d ( It is preferable that f) be matched with the distance (interval) Sf that is separated in the x-axis direction and be included in the range of 0.8 Sf to 1.2 Sf including the error. Further, the distance (interval) Sp separating the pair of adjacent second portions in the x-axis direction is set to the width Wf of the connection terminal d (f). The width Wp1 of the first portion and the width Wp2 of the third portion of the terminal d2 (p) are the distance S ′ separating the pair of adjacent first portions that are expanded by narrowing the first portion in the x-axis direction and the pair of adjacent first portions. It is desirable to determine it according to the balance with the distance S ″ that separates the three portions in the x-axis direction. The width Wp1 of the first portion is less than half of the distance S ′ that separates the adjacent pair in the x-axis direction. The width Wp2 of the part is set to be not more than half of the distance S ″ that separates the adjacent pair in the x-axis direction. The absolute values suitable for the distance S ′ and the distance S ″ are preferably less than 0.5 mm, for example. The length of the terminal d (p) itself of the first circuit board PCB1 (in other words, the width of the connection region CNA1). Yb (CNA) is determined by the standard as described in the comparative example. For example, the width of the end portion of the second circuit board FPC1 (in other words, the length of the connection terminal) is 1.2 times or more Y [TERa]. (More preferably, 1.5 times or more.) In order to prevent the conductive particles PAR from adhering excessively to the terminal d (p) of the first circuit board PCB1, the terminal d (p) of the first circuit board PCB1 The length Yb (CNA) is preferably not excessively extended in the y-axis direction, and the length of the terminal d (p) of the first circuit board PCB1 is preferably, for example, less than twice Y [TERa].

  The other structures and materials of the first circuit board PCB1 and the second circuit board FPC1 in the present embodiment described above have been described with reference to FIGS. 2A to 2C in the background art section. It is as follows. The second circuit board FPC1 has a mounting structure known as TCP (Tape Carrier Package) or COF (Chip On Film) on which the display panel drive element IC1 is mounted by a TAB (Tape Automated Bonding) method. The second circuit board FPC1 includes an insulating base film BSF (f), a conductor film such as a metal, an alloy, or a conductive oxide formed on the main surface thereof (which also serves as the main surface of the second circuit board FPC1). A plurality of wirings d (f) and an insulating film INS (f) covering the plurality of wirings d (f). On the other hand, the first circuit board PCB1 is made of an insulating base material BSF (p), a conductor film such as a metal, an alloy, or a conductive oxide formed on the main surface (also the main surface of the first circuit board PCB1). A plurality of wirings d (p) and an insulating film INS (p) covering the plurality of wirings d (p). In contrast to the base film BSF (f) of the second circuit board FPC1 molded only with the resin, the base material BSF (p) of the first circuit board PCB1 may be molded firmly with glass fiber or the like immersed in the resin. The insulating film INS (p) may be formed of a thin film of a resin or an inorganic material as in the case of the insulating film INS (f) of the second circuit board FPC1, but a solder resist that can easily form a film thicker than these materials is used. It may be replaced.

  FIG. 8A schematically illustrates the planar structure of the connection region CNA1 of the novel first circuit board PCB1 that characterizes the display device according to the present invention, according to FIG. The terminal d (p) formed on the first circuit board PCB1 of Example 1 is in either the positive or negative direction of the y axis at the position of the connection terminal d (f) of the second circuit board connected to the terminal d (p). Is designed to allow the same degree of deviation, whereas the terminal d2 (p) provided on the first circuit board PCB1 of this embodiment is the connection terminal of the second circuit board connected thereto. The position of d (f) is designed with priority given to the negative displacement of the y-axis. Therefore, when the terminal d2 (p) shown in FIG. 8A is divided into the design region (length Lp) and the two extended portions (lengths Lp1, Lp2) defined in the first embodiment, these lengths are divided. Satisfies the relationship Lp> Lp1> Lp2. In order to give priority to shifting the connection terminal d (f) in the negative direction of the y-axis, the extension portion (Lp1) extending in the negative direction of the y-axis is formed longer than the extension portion (Lp2) extending in the positive direction of the y-axis. The The difference in reference numerals between the terminal d2 (p) of the present embodiment and the terminal d (p) of the first embodiment will be described later.

  The first circuit board PCB1 of this embodiment designed as shown in FIG. 8A is formed as shown in FIG. 5C, for example. The connection terminal d (f) of the second circuit board is connected to the design region of the terminal d2 (p) formed at both ends of the first circuit board PCB1 and in the vicinity thereof with the alignment mark ALM1 as a reference. At this time, the shape of the terminal d2 (p) in this embodiment shown in FIG. 8A is caused by the center of the first circuit board PCB1 being warped in the positive direction of the y-axis (the direction opposite to the display panel PNL). Solve a problem. This problem is the short circuit between the adjacent terminals d2 (p) described in the first embodiment, the first circuit board PCB1 (terminal d2 (p)), and the second circuit board (connection terminal d (f)). The variation that occurs along the x-axis of the electrical connection conditions. In other words, when the connection terminal d (f) of the second circuit board is aligned with the design region of the terminal d2 (p) formed at the center of the first circuit board PCB1 of this embodiment, FIG. The shape of the terminal d2 (p) of the present embodiment shown solves the above-mentioned problems caused by the center of the first circuit board PCB1 being warped in the negative y-axis direction (toward the display panel PNL).

  In the present embodiment as well, in the same manner as in the first embodiment, in view of this, a first circuit board PCB1 as described below was prototyped. In this prototype, the lengths of Lp1, Lp, and Lp2 described above are 0.5 mm, 1.2 mm, and 0.2 mm, respectively. Further, as shown in FIG. 8B, the terminal d2 (p) has a first part (length Ye1), a second part (length Yc), If it divides into the 3rd part (length Ye2), each length will be 0.5 mm, 1.0 mm, and 0.4 mm. In other words, the lengths Ye1, Yc, and Ye2 satisfy the relationship of Yc> Ye1> Ye2, Ye1 = Lp1, Yc <Lp, and Ye2> Lp2. In the terminal d2 (p), the width Wp1 of the first portion and the width Wp2 of the third portion are 0.25 mm, and the width Wp of the second portion is 0.5 mm. The interval Sp ′ separating the first portions of the pair of adjacent conductor layers d2 (p) and the interval Sp ″ separating the third portions are 0.75 mm, and the interval Sp separating the second portions is 0.5 mm. The second circuit board connected to the prototyped first circuit board PCB1 has a connection terminal d (f) of 0.5 mm in width Wf of 0.5 mm, similar to that used in the first embodiment. This connection terminal is connected to the end of the conductor layer d (f) formed on the second circuit board with a length Y of 1.2 mm (dimension in the y-axis direction). [TERa] is exposed from the insulating film INS (f).

  In the first circuit board PCB1 of this embodiment, as shown in FIG. 8B, a terminal made of the conductor layer d2 (p) is formed on the main surface of the base material BSF (p), and this base material BSF (p) A circuit composed of the conductor layer d (p) is formed on the back surface (the other main surface opposite to the main surface). The two conductor layers d2 (p) and d (p) are electrically connected through a through hole TH penetrating the base material BSF (p). In FIG. 8A, the conductor layer d (p) and the through hole TH are indicated by thin broken lines. The through hole TH is preferably connected to the terminal d2 (p) at the second wide portion. In the first circuit board PCB1 shown in FIGS. 8A and 8B, a conductor layer d2 (p) serving as a terminal and a conductor layer d (p) forming a wiring extending into the first circuit board PCB1 from the conductor layer d2 (p). Is formed in another layer (Level), the conductor layer d2 (p) does not extend outside the connection region CNA1 like the conductor layer d (p) of the first embodiment. However, when the first circuit board PCB1 of the present embodiment has the same cross-sectional structure as the first circuit board PCB1 illustrated in the first embodiment, the conductor layer d (in the connection region CNA1 shown in FIG. The contour of p) is formed following that of the terminal d2 (p) shown in FIG. Further, the width of the conductor layer d (p) extending outside the connection region CNA1 may be wider than the first portion or the third portion of the terminal, as in the first embodiment.

  On the other hand, the outline of the connection terminal d (f) of the second circuit board connected to the terminals formed on the first circuit board PCB1 of the present embodiment is the four terminals d2 ( The design area (length) of a terminal d2 (p) is indicated by a broken line drawn on two inner sides of p) and has a length Y [TERa] extending from the end along the y-axis as a connection terminal. Lp portion). As described above, the first circuit board PCB1 of this embodiment takes into account that the position of the connection terminal d (f) of the second circuit board connected to the terminal d2 (p) is likely to shift in the negative direction of the y-axis. Designed. Therefore, the outline of the connection terminal of the second circuit board connected to the terminal d2 (p) at the left end in FIG. 8A with the largest deviation in the negative direction of the y-axis is represented by a two-dot chain line d (f) ". This outline d (f) ″ indicates only a portion that is actually connected to the terminal d2 (p) of the conductor layer d (f) of the second circuit board, and its position is the design of the terminal d2 (p). The region is deviated by a distance TER (−y) in the negative direction of the y-axis.

  As shown in FIG. 8A, the first circuit board PCB1 of this embodiment designed with such a technical background has an end in contact with the first part of the second part of the terminal d2 (p). It overlaps with the end of the design area d2 (p) (the negative side of the y-axis, close to the so-called display panel PNL). In other words, the length Lp1 of the extended portion formed on the negative side of the y-axis is equal to the length Ye1 of the first portion. For this reason, compared with Example 1, the 2nd part of terminal d2 (p) can be formed long, and the connection resistance of terminal d2 (p) and connecting terminal d (f) can be reduced. Also, the overlap between the second portion of the two inner terminals d2 (p) in FIG. 8A and the outline (thick dashed line) of the length Y [TERa] portion of the connection terminal d (f) As apparent from a comparison between the second portion of the terminal d2 (p) shown and the overlap of the outline d (f) ″ (two-dot chain line) of the connection terminal, the terminal d2 (p) and the connection terminal d (f) The electrical connection conditions are kept constant without being affected by the difference in alignment between the design area of the connection terminal d (f) and the terminal d2 (p) generated in the x-axis direction of the first circuit board PCB1. Further, although the first portion becomes shorter as the second portion of the terminal d2 (p) extends, the short circuit between the terminals d2 (p) is prevented by forming the first portion and the third portion. This is as described in the first embodiment.

  From the above description, it appears that the first and third portions of the terminal d2 (p) formed on the first circuit board PCB1 of this embodiment are formed longer than necessary. However, considering an unexpected shift of the connection terminal d (f) (including the positive direction of the y-axis), it is desirable to form the first part and the third part of the terminal d2 (p) redundantly in this way. In addition, as described above, the redundant part is preferably narrower than the second part, and the adjacent pairs are more widely separated in the x-axis direction as defined in the first part and the third part.

  In the present embodiment, similarly to the first embodiment, it is desirable that the length Yc of the second portion of the terminal d2 (p) be smaller than the length Y [TERa] of the connection terminal d (f), and its width Wp matches the width Wf of the connection terminal d (f), and its width (dimension in the x-axis direction) Wp is a distance (interval) Sf that separates a pair of adjacent connection terminals d (f) in the x-axis direction. In addition, it is preferable that the error is included in the range of 0.8 Sf to 1.2 Sf. Further, the distance (interval) Sp separating the pair of adjacent second portions in the x-axis direction is set to the width Wf of the connection terminal d (f). The width Wp1 of the first portion and the width Wp2 of the third portion of the terminal d2 (p) are the distance S ′ separating the pair of adjacent first portions that are expanded by narrowing the first portion in the x-axis direction and the pair of adjacent first portions. It is desirable to determine according to the balance with the distance S ″ that separates the three portions in the x-axis direction. For example, the width Wp1 of the first portion is less than half of the distance S ′ that separates the adjacent pair in the x-axis direction. The width Wp2 of the three portions is set to be not more than half of the distance S ″ that separates the adjacent pairs in the x-axis direction. The absolute values suitable for the distance S ′ and the distance S ″ are preferably less than 0.5 mm, for example. The length of the terminal d (p) itself of the first circuit board PCB1 (in other words, the width of the connection region CNA1). Yb (CNA) is determined by the standard as described in the comparative example. For example, the width of the end portion of the second circuit board FPC1 (in other words, the length of the connection terminal) is 1.2 times or more Y [TERa]. (More preferably, 1.5 times or more.) In order to prevent the conductive particles PAR from adhering to the terminals d (p) of the first circuit board PCB1, the terminals d (p) of the first circuit board PCB1 are used. ) May be suppressed to, for example, not more than twice Y [TERa].

  In the first circuit board PCB1 described in this embodiment, the insulating base material BSF (p) may be formed of only a resin, but the base of the second circuit board FPC1 is made of glass fiber or the like immersed in the resin. The film may be formed more firmly than the film BSF (f). The conductor layers d (p) and d2 (p) are formed of, for example, a metal, an alloy, or a conductive oxide. The insulating film INS (p) may be formed of a thin film of a resin or an inorganic material as in the case of the insulating film INS (f) of the second circuit board FPC1, but a solder resist that can easily form a film thicker than these materials is used. It may be replaced. The plurality of terminals d2 (p) formed on the first circuit board PCB1 and the connection terminals d (f) of the second circuit board FPC1 are electrically connected by an anisotropic conductive film ACF.

In this embodiment, the overall shape of the first circuit board PCB1 exemplified in Embodiments 1 and 2 and the structure of a display device to which the first circuit board PCB1 is applied will be described.
In the display device shown in FIG. 9A, a vertical drive circuit VDR (for example, a scanning signal output circuit in active drive, a segment signal output in passive drive) is formed on a substrate SUB1 of a display panel PNL with polycrystalline silicon or pseudo single crystal silicon. Circuit) and a horizontal drive circuit HDR (for example, an image signal output circuit in active drive, a segment signal output circuit in passive drive). For this reason, the second circuit board FPC1 is different from that shown in FIG. 1 and the like and is used as a simple connector (Connector) on which the drive element IC1 is not mounted. The first circuit board PCB1 is used as an interface circuit board such as the control circuit board CTB shown in FIG. 1 on which the display control circuit Tcon is mounted.

  An end portion of one second circuit board FPC1 extending in the x-axis direction is connected to the connection area CNA of the first circuit board PCB1. As shown in FIG. Since it is formed to extend long in the axial direction, the problems described in the comparative example occur in the regions 6a and 6b. Therefore, even when the plurality of second circuit boards FPC1 are integrated and connected to the first circuit board PCB1 extending in the x-axis direction, the terminals of the first circuit board PCB1 are connected as shown in the first and second embodiments. It is good to form.

  Further, in the first circuit board PCB1 shown in FIG. 9B, the maximum dimension Pmax (x) in the x-axis direction is larger than the maximum dimension Pmax (y) in the y-axis direction, and Pext (x) and y in the x-axis direction. An extending portion extending in the axial direction by Pext (y) is formed. In the first circuit board PCB1, the extending portion is easily warped as described above. Therefore, even in the first circuit board PCB1 whose maximum dimension satisfies the relationship of Pmax (x) ≦ Pmax (y), the extension satisfying the condition of Pext (x)> Pext (y) and the connection portion CNA is formed. In the case of having a portion, a plurality of terminals arranged in parallel to the connection portion CNA may be formed as shown in the first and second embodiments.

  In FIG. 9A, an area PIX surrounded by a broken-line frame indicates one of a plurality of pixel areas arranged two-dimensionally on the main surface of the display panel. In each pixel region PIX, a pixel circuit PX (indicated by a capacitor, which directly contributes to image display, may be replaced by a diode in an EL display device), and a control circuit SW ( For example, a switching element) is formed. The illustrated pixel region PIX is shown in accordance with a display device that is actively driven, but the control circuit SW is removed from the pixel region PIX in a display device that is passively driven.

It is a top view which illustrates typically the structure of the display panel periphery of the display apparatus (liquid crystal display device) used as the background art of this invention. It is an enlarged view which shows the connection form of 1st circuit board PCB1 and 2nd circuit board FPC1 used for the display apparatus shown by FIG. 1, (A) is a top view of a connection part, (B) and (C) are FIG. The cross-sectional structure of the connecting portion is shown. FIG. 3 is a plan view for explaining a problem of “warping” occurring in the first circuit board PCB1 shown in FIGS. 1 and 2A to 2C. 1A is a plan view showing a state in which the first circuit board PCB1 is warped as shown in FIG. 3B in the display device shown in FIG. 1, and FIG. 3B is a first circuit board PCB1 at this time. It is sectional drawing which shows the connection part of 2nd and 2nd circuit board FPC1. (A) is a plan view showing a conventional first circuit board PCB1 together with a second circuit board FPC1 connected to the connection area CNA1, and (B) is a center of the first circuit board PCB1 shown in FIG. (C) is a plan view showing the first circuit board PCB1 in the comparative example examined by the present inventors together with the second circuit board FPC1 connected to the connection region CNA1, and (C). (D) is a plan view showing a state in which the center of the first circuit board PCB1 shown in (C) is along the negative direction of the y-axis. FIG. 5A is a plan view for explaining a short circuit between terminals d (p) occurring in the region 6a of FIG. 5D, and FIG. 5B is a short circuit between the terminals d (p) occurring in the region 6b of FIG. (C) is sectional drawing which shows the short circuit location between terminal d (p) demonstrated by (A), (D) is between terminal d (p) demonstrated by (B) It is sectional drawing which shows a short circuit location. (A) is the top view which shows typically and expanded the connection form of 1st circuit board PCB1 and 2nd circuit board FPC1 in the display apparatus of Example 1 of this invention, (B) is (A). It is sectional drawing which shows the connection part of 1st circuit board PCB1 shown and 2nd circuit board FPC1. (A) is the top view which shows typically and expanded the connection form of 1st circuit board PCB1 and 2nd circuit board FPC1 in the display apparatus of Example 2 of this invention, (B) is (A). It is sectional drawing which shows the connection part of 1st circuit board PCB1 shown and 2nd circuit board FPC1. (A) is a top view which illustrates typically the structure of the display panel and its periphery in the display apparatus of Example 3 of this invention, (B) is the 1st used for the display apparatus shown by (A). It is a top view explaining the shape of circuit board PCB1.

Explanation of symbols

PNL ... Display panel, PCB1, PCB2 ... First circuit board, FPC1, FPC2, ... Second circuit board, CNA1, CNA2, ... Connection area of the first circuit board, TERa, TERb .... The end (connection terminal) of the second circuit board.

Claims (14)

A display panel;
A first circuit having a main surface along a first direction and a second direction intersecting the first direction, and a plurality of terminals extending in the second direction arranged in parallel in the first direction on the main surface A substrate,
And at least one second circuit board having one end electrically connected to the display panel and the other end electrically connected to the plurality of terminals of the first circuit board,
Each pair of adjacent terminals of the plurality of terminals is separated from each other at both ends more widely than between both ends.   The display device according to claim 1, wherein the main surface of the first circuit board extends longer along the second direction than along the first direction.   The first circuit board includes a plurality of second circuit boards arranged along the first direction, and the plurality of terminals of the first circuit board are arranged along the first direction with respect to the plurality of second circuit boards. 2. The display device according to claim 1, wherein the display device is divided into a plurality of groups corresponding to each of the plurality of groups and electrically connected to the second circuit board corresponding to each of the plurality of groups.   The display panel is formed in a rectangular shape having a pair of opposite sides and another pair of sides extending in a direction intersecting one of the pair of sides, and the plurality of second circuit boards are formed on the display panel. The display device according to claim 3, wherein the display device is juxtaposed along one of the pair of sides and the other pair of sides.   The display device according to claim 3, wherein a driving circuit element of the display panel is mounted on each of the plurality of second circuit boards.   2. The display according to claim 1, wherein a region where the plurality of terminals are arranged in parallel in the first direction on the main surface of the first circuit board extends longer in the first direction than in the second direction. apparatus.   The width along the second direction of the region where the plurality of terminals are arranged side by side is larger than the width along the second direction of the other end electrically connected to the plurality of terminals of the second circuit board. The display device according to claim 6, which is wide.   The first circuit board and the second circuit board electrically connected to the first circuit board have a thickness along a third direction intersecting the first direction and the second direction, and the second circuit board is flexible. The display device according to claim 7. A display panel;
A first surface having a main surface along a first direction and a second direction intersecting the first direction, and a plurality of terminals extending in the second direction are formed side by side in the first direction on the main surface. A circuit board;
And at least one second circuit board having one end electrically connected to the display panel and the other end electrically connected to the plurality of terminals of the first circuit board,
At the other end of the second circuit board, a connection terminal is formed which is connected to one of the plurality of terminals of the first circuit board and extends along the second direction while being connected to the one terminal. And
The length of the one terminal of the first circuit board extending along the second direction is longer than that of the connection terminal of the second circuit board, and the width of the one terminal along the first direction is A display device in which both ends of the one terminal are narrower than a portion between the both ends.   The plurality of terminals formed on the main surface of the first circuit board are a part of a plurality of wirings formed as a conductor layer on the first circuit board main surface. The display device according to claim 9, wherein the display device is exposed from an opening formed in an insulating film covering the plurality of wirings.   The opening of the insulating film is formed to extend longer along the first direction than the second direction, and the length along the second direction of the plurality of terminals arranged in parallel with the opening is the length of the opening. The display device according to claim 10, which is determined by a width along the second direction.   The plurality of connection terminals respectively connected to the plurality of terminals of the first circuit board arranged in the opening of the insulating film are arranged in parallel at the other end of the second circuit board. The display device described in 1.   The length along the second direction of the portion that is formed between the both ends of the one terminal of the first circuit board and that is wider than the both ends along the first direction is connected to the one terminal. The display device according to claim 9, wherein the display device is shorter than that of the connection terminal of the second circuit board. The connection terminal of the second circuit board is a part exposed from an insulating film covering the conductor layer at the other end of the second circuit board of a conductor layer formed on the main surface of the second circuit board. The display device according to claim 9.

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