JP2018169541A - Display device - Google Patents

Abstract

To provide a display device with improved operation reliability.SOLUTION: A display device 100 for displaying an image includes: a display panel part 10 including a curved display screen 13; a circuit board 20 formed in a flat shape; and a flexible wiring board 30 formed in a flexible band shape including a pair of side edge parts 30a and connecting a curved curvature side 14 and the circuit board 20 at the display panel part 10. The flexible wiring board 30 includes a pair of slit recesses 31 caving in like a slit inside from each side edge part 30a at both sides, correspondingly to the pair of side edge parts 30a.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a display device that displays an image.

  Conventionally, display devices that display images are known. The display device of Patent Document 1 includes a display unit, a plurality of circuit boards, and a plurality of flexible wiring boards. The display unit has a curved display screen. Each flexible wiring board connects a curved side curved in the display unit and one of the plurality of circuit boards.

  The plurality of circuit boards are held by a board holding plate, and the board holding plate is a plate that is bent into a polygonal shape. The flexible wiring board is connected to the curved side on the display unit side, and is connected to a flat substrate pasting part on the circuit board side.

JP2013-134295A

  As described above, in the flexible wiring board of Patent Document 1, the display unit side is curved and the circuit board side is flat. Therefore, the flexible wiring board exists in a slightly twisted state. Under such circumstances, if one of the curved side and the circuit board is displaced by, for example, heat, the influence of the displacement easily reaches the other, and as a result, the connection state of the flexible wiring board may become unstable. For this reason, the reliability of the operation of the display device cannot be sufficiently improved.

  One object of the present disclosure is to provide a display device with improved operational reliability.

The display device disclosed herein is a display device that displays an image,
A display unit (10) having a curved display screen (13, 213);
A circuit board (20) formed in a flat plate shape;
A flexible strip having a pair of side edges (30a) and having a curved side (14) curved in the display unit and a circuit board;
The flexible wiring board has a pair of slit recesses (31) that are recessed inward from each side edge on both sides corresponding to the pair of side edges.

  According to such a display device, the flexible wiring board has a pair of slit recesses that are recessed inward from each side edge on both sides corresponding to the pair of side edges. By providing such a slit recess, the display portion side of the flexible wiring board is curved along the curved side, while the slit recess is provided even if the flat circuit board side is not curved. The twist of the flexible wiring board is absorbed, and the connection stability is improved. Even if one of the curved side and the circuit board is displaced by, for example, heat, the influence of the displacement hardly reaches the other, so that the connection state of the flexible wiring board can be maintained. As described above, a display device with improved operation reliability can be provided.

  In addition, the code | symbol in parenthesis shows the corresponding relationship with the part of embodiment mentioned later, Comprising: It does not intend limiting the technical scope.

In the display apparatus of 1st Embodiment, it is a perspective view which shows the state which has not bent the flexible wiring board. It is sectional drawing which shows typically the display panel part of 1st Embodiment. It is an enlarged view which expands and shows the display screen of 1st Embodiment partially. It is a figure which shows the detailed structure of the flexible wiring board of 1st Embodiment. It is a perspective view which shows the display apparatus of 2nd Embodiment. It is a figure which shows the flexible wiring board of the modification 1. FIG. It is a figure corresponding to FIG. 6 in one specific example among the modifications 2. FIG. It is a figure corresponding to FIG. 6 in one specific example among the modifications 2. FIG. It is a figure corresponding to FIG. 6 in one specific example among the modifications 2. FIG. It is a figure corresponding to FIG. 6 in the modification 3. It is a figure corresponding to FIG. 6 in the modification 4.

  Hereinafter, a plurality of embodiments will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. In addition, not only combinations of configurations explicitly described in the description of each embodiment, but also the configurations of a plurality of embodiments can be partially combined even if they are not explicitly specified unless there is a problem with the combination. .

(First embodiment)
The display device 100 according to the first embodiment of the present disclosure is mounted on a vehicle and installed on an instrument panel facing a seat on which a viewer is seated. The display device 100 shown in FIG. 1 displays a color image toward the viewing side. Thereby, the viewer located on the viewer side with respect to the display device 100 can perceive the displayed information.

  Such a display device 100 includes a display panel unit 10, a circuit board 20, a plurality of flexible wiring boards 30, and the like.

  The display panel unit 10 is a display unit that is formed in a curved plate shape and has a curved display screen 13. The display panel unit 10 of the present embodiment is a transmissive TFT liquid crystal display using thin film transistors. Thus, the display panel unit 10 includes the liquid crystal panel 12 and the backlight 16 as shown in FIG. The portion of the liquid crystal panel 12 excluding the display screen 13 and the backlight 16 are covered with a light-shielding panel case 11. In particular, the liquid crystal panel 12 of the display panel unit 10 of the present embodiment is formed in a rectangular shape having a longitudinal direction LD and a short direction SD, and the display screen 13 is formed into a concave and cylindrical surface by curving only the longitudinal direction LD. Forming.

  The liquid crystal panel 12 is formed in a curved plate shape by laminating a liquid crystal layer or the like sandwiched between a pair of polarizing plates and a pair of linear polarizing plates. Each polarizing plate has a transmission axis and an absorption axis orthogonal to each other, and has a property that the polarization direction transmits light along the transmission axis and absorbs light along the absorption axis. The transmission axes are arranged orthogonal to each other. The liquid crystal layer can rotate the polarization direction of light incident on the liquid crystal layer according to the applied voltage by applying a voltage to each sub-pixel 15.

  In addition, when the sub-pixel 15 is enlarged by looking at the enlarged view of the display screen 13 as shown in FIG. 3, an opening region 12 a formed by optical opening corresponding to the sub-pixel 15 is provided. It has been. Further, a wiring region 12 b is provided so as to surround the opening region 12 a and to apply a voltage to the sub-pixel 15. Adjacent sub-pixels 15 are provided with color filters of different colors (for example, red, green, and blue), and various colors are realized by combining these color filters.

  As shown in FIG. 2, the backlight 16 illuminates the liquid crystal panel 12 from the back side opposite to the display screen 13. The backlight 16 is disposed so as to overlap the liquid crystal panel 12 and includes a light guide plate 17 formed in a flat plate shape and a plurality of light emitting elements 18 that emit light toward the side surfaces of the light guide plate 17. Each light emitting element 18 is, for example, a light emitting diode element that emits pseudo white light. The entire back surface of the liquid crystal panel 12 can be illuminated by light introduced from the light emitting elements 18 into the light guide plate 17. The light guide plate 17 may be formed in a curved plate shape that is curved similarly to the liquid crystal panel 12.

  As shown in FIG. 1, the liquid crystal panel 12 of the display panel unit 10 that displays an image on the curved display screen 13 has a conductive connection part 14a electrically connected to the wiring region 12b on one side in the longitudinal direction LD. And a curved side 14 curved along the display screen 13.

  The circuit board 20 is formed in a flat plate shape using a synthetic resin such as a glass epoxy resin. The circuit board 20 has a mounting surface 21 having a conductive pattern formed on at least one surface. In the present embodiment, a part of the control circuit 40 configured by a plurality of electronic components 41 is provided on the mounting surface 21. The control circuit 40 can communicate with an external device by wired or wireless communication, and displays an image on the display screen 13 at any time by controlling the display panel unit 10 based on an input signal from the device. To do. Examples of the electronic component 41 constituting the control circuit 40 include a semiconductor element, a capacitor, a transistor, and a resistor.

  The circuit board 20 according to the present embodiment has a linear side 22 that is formed to have a dimension approximately the same as the dimension of the curved side 14 and extends linearly. The straight side 22 is provided with a conduction connecting portion 22a electrically connected to a part of the control circuit 40 provided on the circuit board 20 through a conduction pattern. Here, the straight side 22 of the circuit board 20 is disposed so as to be substantially parallel to the longitudinal direction LD of the display panel unit 10.

  A plurality of (for example, six) flexible wiring boards 30 are provided for one curved side 14 of the display panel unit 10. Each flexible wiring board 30 is formed in a flexible strip shape in which the width between the pair of side edge portions 30 a is smaller than the dimension of the curved side 14, for example, by a base film formed of polyimide or the like. The base film is formed, for example, by being punched into a predetermined shape using a press die.

  Each flexible wiring board 30 extends linearly from one end 30b to the other end 30c, and extends in the extending direction of the curved side 14 and the extending direction of the linear side 22 (that is, the longitudinal direction LD in the present embodiment). Are arranged along. The flexible wiring boards 30 are arranged such that the width direction WD is aligned with the arrangement direction. The other end 30c of each flexible wiring board 30 is reinforced in strength.

  Each flexible wiring board 30 has one end 30 b connected to the curved side 14 of the display panel unit 10 and the other end 30 c connected to the straight side 22 of the circuit board 20. While being connected mechanically with the straight side 22, between both the conduction connection parts 14a and 22a, it is electrically connected.

  In particular, in the present embodiment, a thin-film metal seal made of metal is pasted between the side edge portions 30a of one end portion 30b of each flexible wiring board 30. The flexible wiring board 30 and the display panel unit 10 are connected by attaching the metal seal to the curved side 14. Similarly, a thin-film metal seal made of metal is pasted between the side edge portions 30a at the other end portion 30c of each flexible wiring board 30. Each of the flexible wiring boards 30 and the circuit board 20 are connected by the metal seal being affixed to the straight side 22 as well.

  With these connections, each flexible wiring board 30 is curved in the width direction WD with a curvature along the curved side 14 at one end 30b on the display panel 10 side, while the other end on the circuit board 20 side. At 30 c, it is in a state extending linearly along the straight side 22.

  As shown in detail in FIG. 4, each flexible wiring board 30 is provided with a pair of slit recesses 31. The pair of slit recesses 31 are recessed in a slit shape from the side edge portions 30a on both sides to the inside of the flexible wiring board 30 corresponding to the pair of side edge portions 30a. The pair of slit recesses 31 are arranged to face each other in the width direction WD of the flexible wiring board 30. More specifically, the pair of slit recesses 31 are provided on the display panel unit 10 side of the flexible wiring board 30 with respect to the intermediate position between the one end 30b and the other end 30c.

  In the present embodiment, each slit recess 31 is recessed in a rectangular shape in which the longitudinal direction of the slit recess 31 is aligned with the width direction WD of the flexible wiring board 30. Each rectangular slit recess 31 has a corner portion 32 at two locations corresponding to the vertexes of the rectangle on the central portion side of the flexible wiring board 30. Each corner portion 32 is formed with a roundness because the edge portion of the flexible wiring board 30 is curved.

  Each flexible wiring board 30 has a plurality of conductive patterns 33 that electrically connect one end 30b and the other end 30c. Each conductive pattern 33 is provided between the one end portion 30b and the other end portion 30c by sticking a conductive metal such as a copper foil to the surface of the base film. By passing the conductive pattern 33 between the pair of slit recesses 31, a wiring portion 34 to which the conduction pattern 33 is wired is formed between the pair of slit recesses 31.

  Further, in each flexible wiring board 30, an integrated circuit portion 42 is disposed on the circuit board 20 side than the pair of slit recesses 31. The integrated circuit unit 42 is configured as a flat rectangular chip-shaped component such as a semiconductor element and a multilayer wiring structure, and further has an input / output terminal electrically connected to the conductive pattern 33. Each integrated circuit portion 42 arranged and mounted on each flexible wiring board 30 constitutes a control circuit 40 together with an electronic component 41 mounted on the mounting surface 21 of the circuit board 20.

  In the region closer to the display panel unit 10 than the pair of slit recesses 31, the twist or the deflection of the flexible wiring board 30 along the curved side 14 of the one end 30b is transmitted. On the other hand, in a region closer to the circuit board 20 than the pair of slit recesses 31 in which the integrated circuit part 42 is disposed, the pair of slit recesses 31 absorbs the twist or deflection on the display panel unit 10 side, thereby moving to the circuit board 20 side. The transmission of the torsion or deflection is regulated. For this reason, the flexible wiring board 30 is maintained in a relatively flat state in a region closer to the circuit board 20 than the pair of slit recesses 31. In this way, the integrated circuit portion 42 is stably held, and stress due to the bending of the curved side 14 is suppressed from reaching the integrated circuit portion 42.

  In this embodiment, the circuit board 20 is opposite to the display screen 13 of the display panel unit 10 by bending the vicinity of the slit recess 31 of the flexible wiring board 30 to the backlight 16 side of the display panel unit 10. To improve the mountability to the vehicle.

  In FIG. 1, illustration of the conductive pattern 33 and the integrated circuit unit 42 is omitted, and only a part of the slit recess 31 is denoted by a reference numeral.

(Function and effect)
The operational effects of the present embodiment described above will be described below again.

  According to the first embodiment, the flexible wiring board 30 has a pair of slit recesses 31 that are recessed inward from the side edge portions 30a on both sides corresponding to the pair of side edge portions 30a. By providing such a slit recess 31, even if the display panel 10 side of the flexible wiring board 30 is curved along the curved side 14, the slit recess 31 even if the flat circuit board 20 side is not curved. Is provided in between, the twist of the flexible wiring board 30 is absorbed, and the stability of the connection is improved. Even if one of the curved side 14 and the circuit board 20 is displaced by, for example, heat, the influence of the displacement hardly reaches the other, so that the connection state of the flexible wiring board 30 can be maintained. As described above, the display device 100 with improved operation reliability can be provided.

  Further, according to the first embodiment, the pair of slit recesses 31 are arranged to face each other in the width direction of the flexible wiring board 30. If it does in this way, since the twist by the side edge part 30a along the curved edge 14 by the side of the display panel part 10 of the flexible wiring board 30 will be absorbed simultaneously by a pair of opposing slit recessed part 31, the said twist will be circuit board 20. It becomes harder and harder to the side. Therefore, the connection stability of the flexible wiring board 30 is increased.

  According to the first embodiment, at least one of the slit recesses 31 has a rounded corner portion 32 on the central side of the flexible wiring board 30. Even when the slits 31 are provided in the flexible wiring board 30, the corners 32 have roundness, so that the flexible wiring board 30 is hardly cracked at the center of the flexible wiring board 30. Damage to the flexible wiring board 30 is suppressed, and connection stability is increased.

  Further, according to the first embodiment, the integrated circuit portion 42 is disposed on the circuit board 20 side of the slit recess 31 in the flexible wiring board 30. Since the slit recess 31 absorbs the twist of the flexible wiring board 30 on the display panel 10 side, the twist is less likely to occur on the circuit board 20 side than the slit recess 31, so that even if the integrated circuit portion 42 is mounted, the integrated circuit It is difficult for the portion 42 to be stressed. As a result of suppressing damage to the integrated circuit portion 42, operation reliability is improved.

  According to the first embodiment, the flexible wiring board 30 and the circuit board 20 are connected by a metal seal. Even in such a configuration, since the twist of the flexible wiring board 30 is absorbed by the slit recess 31, the twist reaches the connection portion between the flexible wiring board 30 and the circuit board 20, and the metal seal is peeled off. The situation can be suppressed. Therefore, the connection stability of the flexible wiring board 30 is increased.

  Further, according to the first embodiment, the flexible wiring board 30 has the wiring portion 34 in which the conductive pattern 33 is wired between the pair of slit concave portions 31. Even if the pair of slit recesses 31 are provided, the electrical connection between the display panel unit 10 and the circuit board 20 is ensured by the wiring unit 34, so that the connection stability of the flexible wiring board 30 is enhanced.

(Second Embodiment)
As shown in FIG. 5, the second embodiment is a modification of the first embodiment. The second embodiment will be described with a focus on differences from the first embodiment.

  In the display device 200 of the second embodiment, one flexible wiring board 30 is provided for one curved side 14 of the display panel unit 10. The flexible wiring board 30 has one end 30b connected to the curved side 14 of the display panel unit 10 as in the first embodiment. On the other hand, the other end 30 c of the flexible wiring board 30 is connected to the circuit board 20 using a plug connector 223 provided on the circuit board 20.

  Specifically, the circuit board 20 has a plug connector 223 at the center of the mounting surface 21. The insertion connector 223 has an elongated rectangular hole-like insertion hole 224 that matches the width of the flexible wiring board 30. In particular, the insertion hole portion 224 of the present embodiment opens toward the normal direction of the mounting surface 21.

  The other end 30c of the flexible wiring board 30 is connected to the circuit board 20 in such a state that the other end 30c of the flexible wiring board 30 is inserted into the insertion hole 224. Note that the display screen 213 of the second embodiment is convex and cylindrical.

  Also in the second embodiment described above, similarly to the first embodiment, the flexible wiring board 30 corresponds to the pair of side edge portions 30a from the side edge portions 30a on both sides to the inside of the flexible wiring board 30. It has a slit recess 31 that is recessed in a slit shape. Therefore, it is possible to achieve the operational effects according to the first embodiment.

  Further, according to the second embodiment, the flexible wiring board 30 and the circuit board 20 are connected in a state where the end 30 c of the flexible wiring board 30 is inserted into the insertion hole 224. Even in such a configuration, the twist of the flexible wiring board 30 is absorbed by the slit recess 31, so that it is easy to match the shapes of the end 30c and the insertion hole 224. Therefore, for example, when the display device 200 is manufactured, work efficiency when the end 30c of the flexible wiring board 30 is inserted into the insertion hole 224 is improved. Therefore, the display device 200 with improved operation reliability can be provided easily.

(Other embodiments)
Although a plurality of embodiments have been described above, the invention is not construed as being limited to these embodiments, and can be applied to various embodiments and combinations within the scope not departing from the gist of the invention. .

  Various shapes can be adopted as the shape of the slit recess 31 as shown in the following modifications 1 and 2. Specifically, as a first modification, as illustrated in FIG. 6, the pair of slit recesses 31 are recessed in a rectangular shape in which the short direction of the slit recesses 31 is aligned with the width direction WD of the flexible wiring board 30. Also good.

  As a second modification, as shown in FIGS. 7 to 9, the pair of slit recesses 31 may be recessed in a triangular shape. More specifically, in the example of FIG. 7, the pair of slit recesses 31 are recessed in an isosceles triangle shape. In the example of FIG. 8, the pair of slit recesses 31 are recessed in a right triangle shape having a right angle portion on the display panel unit 10 side. In the example of FIG. 9, the pair of slit recesses 31 are recessed in a right triangle shape having a right angle portion on the circuit board 20 side. 7-9, each slit recessed part 31 has the corner part 32 in one place corresponding to the vertex of a triangle in the center part side of the flexible wiring board 30. FIG. Each corner portion 32 is formed with a roundness because the edge portion of the flexible wiring board 30 is curved.

  As modification 3, as shown in FIG. 10, in addition to the pair of slit recesses 31 that are recessed inward from the respective side edge portions 30a, additional slit recesses 935 may be provided. The number of additional slit recesses 935 added is not limited to one, and an arbitrary number can be adopted.

  As a fourth modification, as shown in FIG. 11, the pair of slit recesses 31 may not face each other in the width direction WD. That is, the pair of slit recesses 31 may be disposed at shifted positions.

  6 to 11, illustration of the conductive pattern 33 and the integrated circuit unit 42 is omitted.

  As Modification 5, the pair of slit recesses 31 may be formed in different shapes.

  As a sixth modification, the corner portion 32 may be sharply pointed without being rounded.

  As a modified example 7, the pair of slit recesses 31 may be provided at an intermediate position between the one end portion 30b and the other end portion 30c in the flexible wiring board 30, and are provided closer to the circuit board 20 than the intermediate position. May be.

  As a modified example 8, the integrated circuit portion 42 may not be provided on the flexible wiring board 30.

  As a ninth modification, the display panel unit 10 may not be configured by the liquid crystal panel 12 and the backlight 16 as long as the display panel unit 10 has the curved display screen 13. For example, the display panel unit 10 may use a self-luminous OLED display in which organic light emitting diode (OLED) elements are arranged in a two-dimensional direction to form the display screen 13.

  100, 200 Display device, 10 Display panel section (display section), 13, 213 Display screen, 14 Curved side, 20 Circuit board, 30 Flexible wiring board, 30a Side edge, 31 Slit recess

Claims (7)

A display device for displaying an image,
A display unit (10) having a curved display screen (13, 213);
A circuit board (20) formed in a flat plate shape;
A flexible wiring board (30) that is formed in a flexible strip shape having a pair of side edges (30a) and that is curved in the display section and connects the circuit board;
The said flexible wiring board is a display apparatus which has a pair of slit recessed part (31) dented in a slit shape inside each said side edge part from both sides corresponding to a pair of said side edge part.   The display device according to claim 1, wherein the pair of slit concave portions are disposed to face each other in the width direction of the flexible wiring board.   The display device according to claim 1, wherein at least one of the slit concave portions has a rounded corner portion (32) on a central portion side of the flexible wiring board. An integrated circuit portion (42) mounted on the flexible wiring board,
4. The display device according to claim 1, wherein the integrated circuit portion is arranged closer to the circuit board than the slit recess in the flexible wiring board. 5.   The display device according to claim 1, wherein the flexible wiring board and the circuit board are connected by a metal seal. The circuit board has an insertion connector (223) provided with an insertion hole (224),
The display according to any one of claims 1 to 4, wherein the flexible wiring board and the circuit board are connected in a state in which an end (30c) of the flexible wiring board is inserted into the insertion hole. apparatus.   The display device according to any one of claims 1 to 6, wherein the flexible wiring board further includes a wiring portion (34) in which a conduction pattern (33) is wired between the pair of slit concave portions.

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