Indication device

Abstract

To secure a good connection state of a substrate for a light source and a control board without steeply increasing a manufacturing cost.SOLUTION: A display device includes a back chassis, a control board mounted on the back chassis, a display arranged on a front side of the back chassis, to which a current is supplied from the control board, a plurality of rows of substrates for a light source which has a wiring pattern including a plurality of wiring parts and is arranged in the back chassis, respectively, and is grouped, a plurality of light-emitting elements which is arranged in each of the substrates for the light source and is controlled by the control board, and a plurality of flexible flat cables which is arranged corresponding to the groups of the plurality of substrates for the light source, has multi-core structures as to have flat insulators and a plurality of conductor parts aligned in a direction perpendicular to a thickness direction of the insulator, and is connected to the control board, respectively, wherein the plurality of flexible flat cables is connected to all the substrates for the light source in the corresponding groups of the substrates for the light source.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] This technology relates to the technical field of lighting devices in which the lighting and extinguishing of light-emitting elements arranged on a substrate for a light source are controlled by a control board, and display devices equipped with the same.

Background Art

[0002] There is a lighting device including a plurality of substrates for light sources each having a wiring pattern constituted by a plurality of wiring portions, and a plurality of light-emitting elements arranged on the substrate for a light source and controlled for lighting and extinguishing by a control board (for example, see Patent Document 1).

[0003] Such a lighting device is provided, for example, in display devices such as television receivers and personal computers. The display device is provided with a display having a display surface on which an image is displayed and a back chassis arranged on the back side of the display, and the lighting device is arranged, for example, as a backlight between the display and the back chassis.

[0004] In the lighting device described in Patent Document 1, the connection between a plurality of horizontally long substrates for light sources and a control board for controlling the lighting and extinguishing of the light-emitting elements is made via an intermediate board, and the intermediate board is connected to each substrate for a light source via a plurality of connectors.

[0005] By the way, when light is emitted from the light-emitting element in the lighting device as described above, the light-emitting element and the substrate for a light source generate heat, and the substrate for a light source and the like expand or contract due to temperature changes, and there is a possibility that a displacement occurs between the substrate for a light source and the intermediate board, and a good connection state between the substrate for a light source and the intermediate board cannot be ensured.

[0006] Therefore, in the lighting device described in Patent Document 1, the connector is provided with a misalignment tolerance means that allows for misalignment between the light source substrate and the relay substrate. The misalignment tolerance means absorbs the misalignment between the light source substrate and the relay substrate, ensuring a good connection between the light source substrate and the relay substrate, as well as a good connection between the light source substrate and the control substrate via the relay substrate. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2018-98112 [Overview of the project] [Problems that the invention aims to solve]

[0008] However, in the lighting device described in Patent Document 1, a relay board is provided to connect multiple light source boards and a control board, and a misalignment tolerance means is provided in the connector, which may increase manufacturing costs.

[0009] Furthermore, in order to ensure that the tolerance of the misalignment tolerance means provided in the connector is sufficient to withstand expansion or contraction due to temperature changes in the light source substrate, etc., it is necessary to increase the size of the connector. In this case, it may hinder the reduction of manufacturing costs and may lead to an increase in the size of the lighting device and display device.

[0010] Therefore, the purpose of this technology for lighting and display devices is to ensure a good connection between the light source substrate and the control board without increasing manufacturing costs. [Means for solving the problem]

[0011] Firstly, the lighting device according to this technology comprises a plurality of light source substrates, each having a wiring pattern composed of a plurality of wiring sections; a plurality of light-emitting elements arranged on the light source substrates and controlled to turn on and off by a control board; substrate-side connectors attached to each of the plurality of light source substrates; a flexible flat cable having a multi-core structure with a flat plate-shaped insulator and a plurality of conductor sections arranged in a direction perpendicular to the thickness direction of the insulator, with one end connected to the control board; and a plurality of cable-side connectors attached to the flexible flat cable and coupled to the substrate-side connectors, wherein, for each of the plurality of light source substrates, a portion of the conductor sections is electrically connected to the wiring section via the cable-side connectors and the substrate-side connectors.

[0012] As a result, for each light source substrate, some of the conductors in the flexible flat cable connected to the control board are electrically connected to the wiring section via the cable-side connector and the substrate-side connector.

[0013] Secondly, in the lighting device relating to the present technology described above, it is desirable that the plurality of light source substrates are each formed in a shape having a longitudinal direction and are arranged apart in a direction perpendicular to the longitudinal direction, the plurality of light-emitting elements are arranged apart in the longitudinal direction of the light source substrates, and the plurality of cable-side connectors are coupled to the substrate-side connectors attached to each of the plurality of light source substrates.

[0014] This results in multiple light source substrates and flexible flat cables being arranged in a perpendicular configuration.

[0015] Thirdly, in the lighting device relating to the present technology described above, it is desirable that at least two of the light-emitting elements, each arranged on a different light source substrate, be connected in series via the substrate-side connector, the cable-side connector, and the flexible flat cable.

[0016] This causes the light-emitting elements, each positioned on a different light source substrate, to be switched on and off simultaneously.

[0017] Fourth, in the lighting device relating to the present technology described above, it is desirable that the cable-side connector is provided with a plurality of connection terminals, the insulator has connection holes formed in it that expose some of the plurality of conductors, and that some of the connection terminals are connected to the conductors by being inserted into the connection holes.

[0018] As a result, the connection terminal is inserted into the connection hole, connecting to the conductor, and some of the multiple conductors are electrically connected to the wiring.

[0019] Fifth, in the lighting device relating to the present technology described above, it is desirable that the cable-side connector is provided with a plurality of connection terminals that are connected to the plurality of conductor portions, and the substrate-side connector is provided with at least one electrode that is connected to some of the connection terminals among the plurality of connection terminals.

[0020] As a result, the connection and insulation between the conductor and the wiring are performed depending on the presence or absence of electrodes at the connection terminals, making it possible to use multiple light source substrates having the same wiring pattern.

[0021] Sixth, in the lighting device relating to the present technology described above, it is desirable that the wiring patterns of the plurality of light source substrates are different, and that at least one of the wiring portions of each of the light source substrates with different wiring patterns is connected to a different conductor portion.

[0022] As a result, due to differences in wiring patterns, the wiring section is connected to different conductor sections, and both the connection between the conductor section and the wiring section and the insulation between the conductor section and the wiring section are performed. This makes it possible to use multiple board-side connectors and cable-side connectors that have the same structure.

[0023] Seventhly, in the lighting device according to the present technology described above, the flexible flat cable is formed in a stepped shape whose width changes as it goes in the longitudinal direction, and has a plurality of width-different portions whose width increases as it approaches the control board in the longitudinal direction. Each cable-side connector is attached to the plurality of width-different portions, and it is desirable that the number of the conductor portions is larger in the width-different portion with a wider width.

[0024] Thereby, the flexible flat cable and the plurality of light source substrates are electrically connected via the respective cable-side connectors attached to the width-different portions having different widths.

[0025] Eighthly, in the lighting device according to the present technology described above, it is desirable that the cable-side connectors having the same configuration are respectively attached to the plurality of width-different portions.

[0026] The flexible flat cable and the plurality of light source substrates are electrically connected via the same cable-side connectors attached to the width-different portions having different widths.

[0027] The display device according to the present technology includes a back chassis, a control board attached to the back chassis, a display disposed on the front side of the back chassis and supplied with current from the control board, a plurality of rows of light source substrates each having a wiring pattern including a plurality of wiring portions and disposed on the back chassis and grouped, a plurality of light emitting elements respectively disposed on the light source substrates and controlled by the control board, and a plurality of flexible flat cables disposed corresponding to the groups of the plurality of light source substrates, each having a multi-core structure including a flat insulator and a plurality of conductor portions arranged in a direction orthogonal to the thickness direction of the insulator and connected to the control board respectively. The plurality of flexible flat cables are each connected to all of the light source substrates in the corresponding group of the light source substrates.

[0028] As a result, in the lighting device, for each light source substrate, some of the multiple conductors in the flexible flat cable connected to the control board are electrically connected to the wiring section via a cable-side connector and a substrate-side connector. [Effects of the Invention]

[0029] According to this technology, in the wiring section, for each light source substrate, some of the conductors of the flexible flat cable connected to the control board are electrically connected via the cable-side connector and the substrate-side connector. As a result, multiple light source substrates are connected to the control board via the flexible flat cable, ensuring a good connection between the light source substrates and the control board without increasing manufacturing costs.

[0030] Furthermore, the effects described herein are merely illustrative and not limited to those described herein; other effects may also occur. [Brief explanation of the drawing]

[0031] [Figure 1] Figures 2 to 25 illustrate embodiments of the display device and lighting device of this technology, and this figure is a perspective view of the display device. [Figure 2] This is an enlarged cross-sectional view showing the display device with some parts omitted. [Figure 3] This is a front view showing the arrangement of the light source substrate relative to the back chassis. [Figure 4] This is a front view showing a portion of the substrate for the light source. [Figure 5] This is an exploded perspective view showing the light source substrate, substrate-side connector, cable-side connector, and flexible flat cable. [Figure 6] This is a magnified cross-sectional view of a flexible flat cable. [Figure 7] This is a perspective view showing a portion of a flexible flat cable. [Figure 8] This is a perspective view showing the connection terminals of a flexible flat cable and a cable-side connector. [Figure 9] Figures 10 to 14, along with this figure, show a first example of the electrical connection state in the lighting device. This figure is an enlarged front view showing a part of the substrate for the light source. [Figure 10] This is an enlarged front view conceptually showing the board-side connector and flexible flat cable. [Figure 11] This is an enlarged front view conceptually showing the connection between the light source substrate and the flexible flat cable. [Figure 12] This is an enlarged front view conceptually showing the connection between another light source substrate and a flexible flat cable. [Figure 13] This is an enlarged front view conceptually showing the connection between another light source substrate and a flexible flat cable. [Figure 14] This is a perspective view showing a board-side connector that is provided only with electrodes connected to the first wiring section. [Figure 15] Figures 16 to 19, along with this figure, show a second example of the electrical connection state in the lighting device. This figure is an enlarged front view showing a part of the substrate for the light source. [Figure 16] This is an enlarged front view conceptually showing the board-side connector and flexible flat cable. [Figure 17] This is an enlarged front view conceptually showing the connection between the light source substrate and the flexible flat cable. [Figure 18] This is an enlarged front view conceptually showing the connection between another light source substrate and a flexible flat cable. [Figure 19] This is an enlarged front view conceptually showing the connection between another light source substrate and a flexible flat cable. [Figure 20] This is a conceptual diagram showing another example of a flexible flat cable shape. [Figure 21] Figures 22 to 25, along with this figure, show the structure of other light source substrates. This figure is a front view showing the light source substrate mounted on the back chassis. [Figure 22] This is a perspective view of a light source substrate, showing a portion of it in cross-section. [Figure 23] This is a cross-sectional view showing the working fluid and other components sealed in the light source substrate. [Figure 24] This is a front view showing an example where the fluid space is formed separately in the vertical direction of the light source substrate. [Figure 25] This is a front view showing an example where a fluid space extending vertically is formed when the light source substrate is mounted on the back chassis in a horizontally elongated position. [Modes for carrying out the invention]

[0032] The embodiments for implementing this technology's lighting device and display device will be described below with reference to the attached drawings.

[0033] The embodiments described below apply the present technology display device to a television receiver that displays an image on a display, and apply the present technology illumination device to an illumination device provided on this television receiver.

[0034] Furthermore, the scope of application of this technology is not limited to television receivers and the lighting devices installed therein, but can be broadly applied to various display devices such as monitors used in personal computers and the like, and the lighting devices installed on these various display devices.

[0035] In the following explanation, the direction in which the display surface of the display device (television receiver) faces is considered "forward," and directions such as front, back, up, down, left, and right are indicated accordingly. However, the directions shown below are for convenience of explanation, and the implementation of this technology is not limited to these directions.

[0036] <Display device configuration> The configuration of the display device (television receiver) 1 is described below (see Figures 1 to 8).

[0037] The display device 1 is formed in a roughly rectangular shape, for example, being horizontally elongated and thin in the front-to-back direction (see Figure 1). It is used by being mounted on a surface such as a desk using a stand (not shown) or by being attached to a wall using a bracket (not shown).

[0038] The display device 1 has its required components arranged in a housing 2 (see Figures 1 and 2). The housing 2 has a bezel 3 located at the front and a back chassis 4 located at the rear.

[0039] Bezel 3 is formed in a roughly rectangular frame shape.

[0040] The back chassis 4 is formed in a shallow, box-like shape with an opening at the front. A control board 5 is mounted on the back chassis 4, for example, in the center of the rear surface. The control board 5 has functions such as supplying current to the display (described later) and controlling the on / off state of the light source (described later). A cable insertion hole (not shown) is formed in the center of the back chassis 4.

[0041] A rear cover 6 is attached to the rear chassis 4 from the rear. The rear cover 6 is formed in a shallow box shape with an opening at the front, and the control board 5 is enclosed by the rear cover 6.

[0042] A display 7 is positioned on the inner circumference of the bezel 3. The display 7 is a liquid crystal panel, for example, made up of laminated glass substrates and polarizing sheets, with its front surface formed as a display surface 7a on which an image is displayed.

[0043] The display 7 is formed in a roughly rectangular shape, with the portion other than the outer periphery designated as a display area where images are displayed. A connection board (not shown) is provided at the lower end of the display 7, and the connection board is connected to a control board 5 mounted on the rear surface of the back chassis 4. Therefore, the display 7 is supplied with current from the control board 5 via the connection board.

[0044] A frame-shaped holder 8 is positioned inside the bezel 3. The holder 8 holds the display 7, multiple optical sheets 9, 9, ... and a diffuser plate 10, in that order from the front.

[0045] The optical sheets 9, 9, ... are arranged in a stacked state on the front side of the diffuser plate 10. The optical sheets 9, 9, ... have various functions such as light diffusion and control of the direction of light propagation, and the optical sheets 9, 9, ... contribute to the uniformity and improvement of brightness in the display 7. The diffuser plate 10 has the function of diffusing the light emitted from the light source to ensure uniformity of brightness in the display 7.

[0046] A reflective sheet 11 is positioned between the diffuser plate 10 and the back chassis 4. Through holes 11a, 11a, ... are formed in the reflective sheet 11, spaced apart in the top, bottom, left, and right directions.

[0047] A frame-shaped bracket 12 is positioned inside the bezel 3. The bracket 12 is located behind the holder 8. The bracket 12 holds the reflective sheet 11 and the back chassis 4.

[0048] A lighting device 50 is positioned between the diffuser plate 10 and the back chassis 4. The lighting device 50 has light source substrates 13, 13, ..., light-emitting elements 14, 14, ..., substrate-side connectors 15, 15, ..., flexible flat cables 16, 16, ..., and cable-side connectors 17, 17, ... (see Figure 3).

[0049] The light source substrates 13, 13, ... are mounted on the front of the back chassis 4, for example, spaced apart in the vertical and horizontal directions. In the lighting device 50, for example, six light source substrates 13, 13, ... positioned spaced apart vertically are considered as one set G, and four sets of light source substrates 13, 13, ... of one set G are arranged side by side in the vertical and horizontal directions. A wiring pattern 18 is formed on the light source substrate 13, and the wiring pattern 18 is composed of first wiring sections 19, 19, ... and second wiring sections 20, 20, ... (see Figure 4).

[0050] The first wiring sections 19, 19, ... are provided as connection sections 21, 21, ..., with one end connected to each of the light-emitting elements 14, 14, ... and the other end connected to each of the board-side connectors 15.

[0051] The first wiring sections 19, 19, ... are formed at both the upper and lower ends of the light source substrate 13, and the second wiring sections 20, 20, ... are formed in the central part of the light source substrate 13 in the vertical direction.

[0052] The light-emitting elements 14, 14, ... are arranged on the front surface of the light source substrate 13, spaced apart from each other on the left and right sides (see Figures 3 and 4). For example, 10 light-emitting elements 14, 14, ... are arranged on the light source substrate 13 at equal intervals from each other on the left and right sides. For example, light-emitting diodes (LEDs) are used as the light-emitting elements 14. The light-emitting elements 14 are covered from the front by a light-diffusing lens 22 and connected to a first wiring section 19 and a second wiring section 20 (see Figures 2 and 4). The light-diffusing lens 22 is inserted through an insertion hole 11a in the reflective sheet 11, and a portion of it protrudes forward from the reflective sheet 11.

[0053] Support pins 23, 23, ... are attached to the light source substrate 13 (see Figure 2). The support pins 23 are made of a transparent resin material such as polycarbonate. The support pins 23 are attached to the portion of the light source substrate 13 where the first wiring portions 19, 19, ... and the second wiring portions 20, 20, ... are not formed, and protrude forward from the light source substrate 13. The support pins 23 are inserted through the insertion holes 11a of the reflective sheet 11, and their tips are made capable of contacting the rear surface of the diffuser plate 10, thus having the function of suppressing deformation (bending) of the diffuser plate 10 and holding the diffuser plate 10.

[0054] The substrate-side connectors 15, 15, ... are each attached to a portion near one end in the longitudinal direction of the light source substrates 13, 13, ... (see Figure 5). The substrate-side connector 15 has a body 24 that is formed in a horizontally elongated, roughly rectangular shape and penetrates from front to back, and electrodes 25, 25, ... attached to the body 24. The internal space of the body 24 is formed as a coupling hole 24a, and the electrodes 25, 25, ... are attached to both the upper and lower surfaces of the inner circumference of the body 24 at equal intervals from left to right.

[0055] The board-side connector 15 has a main body 24 attached to the light source board 13, and one end of each electrode 25, 25, ... is connected to the first wiring section 19, 19, ... by, for example, soldering. The other end of the electrode 25 is provided as an elastically deformable leaf spring section 25a, with its tip protruding forward from the main body 24.

[0056] Furthermore, on one light source substrate 13, for example, five first wiring sections 19, 19, ... for the positive electrode and five first wiring sections 19, 19, ... for the negative electrode are formed at both the upper and lower ends, for a total of 10 first wiring sections 19, 19, .... The number of electrodes 25, 25, ... is greater than or equal to the number of first wiring sections 19, 19, ... formed on one light source substrate 13, and one electrode 25, 25, ... is connected to each of the first wiring sections 19, 19, ... on one light source substrate 13. Therefore, on one light source substrate 13, the substrate-side connector 15 has electrodes 25, 25, ... connected to the first wiring sections 19, 19, ... and electrodes 25, 25, ... not connected to the first wiring sections 19, 19, ....

[0057] Furthermore, five second wiring sections 20, 20, ... are formed on a single light source substrate 13, for example, spaced apart on the left and right sides. Two adjacent light-emitting elements 14, 14 are connected in series by the second wiring sections 20.

[0058] The flexible flat cable 16 is connected to multiple light source substrates 13, 13, ... via cable-side connectors 17, 17, ... and substrate-side connectors 15, 15, .... One flexible flat cable 16 is connected to six light source substrates 13, 13, ... of a set G (see Figure 3). Therefore, the lighting device 50 is provided with, for example, four flexible flat cables 16, 16, ... for four sets, and these four flexible flat cables 16, 16 are arranged vertically and horizontally in a position corresponding to the center of the back chassis 4 in the left-right direction.

[0059] The flexible flat cable 16 is formed in a sheet shape and has a multi-core structure with a flat insulator 26 and a plurality of conductor portions 27, 27, ... arranged in the width direction perpendicular to the thickness direction of the insulator 26 (see Figure 6). The insulator 26 is made of a resin material and is constructed by crimping two sheet-shaped resin substrates together with the conductor portions 27, 27, ... sandwiched in between. The flexible flat cable 16 is inserted through a cable insertion hole in the back chassis 4 and one end in the longitudinal direction is connected to a control board 5 attached to the rear surface of the back chassis 4.

[0060] The insulator 26 has connection holes 26a, 26a, ... formed in the thickness direction, and some of the conductive parts 27, 27, ... of the conductive parts 27, 27, ... are exposed by the connection holes 26a, 26a, ... (see Figures 6 and 7).

[0061] The cable-side connectors 17, 17, ... are attached to the flexible flat cable 16 and are positioned at equal intervals along the longitudinal direction of the flexible flat cable 16 (see Figure 5). The cable-side connector 17 has a horizontally elongated base body 28 and connection terminals 29, 29, ... attached to the base body 28. The outer shape of the base body 28 is slightly smaller than the outer shape of the main body 24 of the board-side connector 15. The connection terminals 29, 29, ... are attached to both the upper and lower surfaces of the outer circumferential surface of the base body 28 at equal intervals from left to right.

[0062] The cable-side connector 17 has a base body 28 attached to the flexible flat cable 16. The connection terminal 29 is provided with an elastically deformable connection spring portion 29a at its front end, and the tip of the connection spring portion 29a protrudes forward from the base body 28. When the cable-side connector 17 is attached to the flexible flat cable 16, the connection spring portions 29a, 29a, ... of the connection terminals 29, 29, ... are pressed against the insulator 26 or inserted into the connection holes 26a, 26a, ... (see Figure 8). Therefore, the connection spring portions 29a, 29a, ... inserted into the connection holes 26a, 26a, ... are pressed against the conductor portions 27, 27, ... and connected.

[0063] Furthermore, the connection terminals 29, 29, ... of the cable-side connector 17 are connected to the electrodes 25, 25, ... of the board-side connector 15. However, of the electrodes 25, 25, ... only the connection terminals 29, 29, ... connected to the electrodes 25, 25, ... connected to the first wiring sections 19, 19, ... of the light source board 13 are connected to the conductor sections 27, 27, ... of the flexible flat cable 16. Therefore, the flexible flat cable 16 has connection holes 26a, 26a, ... only in the parts where the connection terminals 29, 29, ... connected to the electrodes 25, 25, ... connected to the first wiring sections 19, 19, ... are pressed against it.

[0064] The cable-side connector 17 is connected to the board-side connector 15 by inserting the base body 28 into the coupling hole 24a. The board-side connector 15 and the cable-side connector 17 are each provided with elastically deformable engaging portions (not shown), and the connection between the board-side connector 15 and the cable-side connector 17 is maintained when the base body 28 is inserted into the coupling hole 24a and the engaging portions engage with each other.

[0065] When the cable-side connector 17 is connected to the board-side connector 15, the electrodes 25, 25, ... of the board-side connector 15 are connected to the connection terminals 29, 29, ... of the cable-side connector 17. At this time, a part of the connection terminal 29 is pressed against the leaf spring portion 25a, causing the leaf spring portion 25a to be elastically deformed. The leaf spring portion 25a is then connected to the connection terminal 29 in an elastically deformed state, ensuring a stable connection between the electrodes 25 and the connection terminal 29.

[0066] <Electrical connection status in lighting equipment> Next, a first example of the electrical connection state in the lighting device 50 will be described (see Figures 9 to 14). In this first example of the electrical connection state, the left-right direction will be described from a front view. Also, the parts shown in a pearlescent or blacked-out area in Figures 9 to 13 indicate the parts where electrical connections are made.

[0067] In the lighting device 50, as described above, for example, six light source substrates 13, 13, ... positioned vertically spaced apart are considered as a set G, and four sets of light source substrates 13, 13, ... of a set G are arranged in a row vertically and horizontally. For example, if we designate the light source substrates 13A, 13B, 13C, 13D, 13E, and 13F from top to bottom for a set G, then each of the light source substrates 13A, 13B, 13C, 13D, 13E, and 13F has, for example, 10 light-emitting elements 14, 14, ... arranged at equal intervals horizontally.

[0068] Furthermore, each of the light source substrates 13, 13, ... in a set G is connected to a single flexible flat cable 16 via substrate-side connectors 15, 15, ... and cable-side connectors 17, 17, .... Since the configuration and connection state of the light source substrates 13, 13, ..., substrate-side connectors 15, 15, ..., cable-side connectors 17, 17, ..., and flexible flat cable 16 are the same for each set G, G, ..., the connection state of the light source substrates 13, 13, ... in a set G will be explained below as an example.

[0069] On a single light source substrate 13, two adjacent light-emitting elements 14, 14 are connected in series by a second wiring section 20 without going through a substrate-side connector 15 and a cable-side connector 17.

[0070] That is, if the 10 light-emitting elements 14, 14, ... arranged on the light source substrate 13A are designated as light-emitting elements 14A1, 14A2, 14A3, ..., 14A10 from left to right, then light-emitting elements 14A1 and 14A2 are connected in series by the second wiring section 20, light-emitting elements 14A3 and 14A4 are connected in series by the second wiring section 20, light-emitting elements 14A5 and 14A6 are connected in series by the second wiring section 20, light-emitting elements 14A7 and 14A8 are connected in series by the second wiring section 20, and light-emitting elements 14A9 and 14A10 are connected in series by the second wiring section 20.

[0071] Similarly, if the 10 light-emitting elements 14, 14, ... arranged on the light source substrate 13B are designated as light-emitting elements 14B1, 14B2, 14B3, ..., 14B10 from left to right, then light-emitting elements 14B1 and 14B2 are connected in series by the second wiring section 20, light-emitting elements 14B3 and 14B4 are connected in series by the second wiring section 20, light-emitting elements 14B5 and 14B6 are connected in series by the second wiring section 20, light-emitting elements 14B7 and 14B8 are connected in series by the second wiring section 20, and light-emitting elements 14B9 and 14B10 are connected in series by the second wiring section 20.

[0072] Similarly, in the light-emitting elements 14, 14, ... arranged on the light source substrates 13C to 13F, two adjacent light-emitting elements 14, 14 are connected in series by the second wiring section 20 without going through the substrate-side connector 15 and the cable-side connector 17.

[0073] If the connection portions 21, 21, ... of the first wiring portions 19, 19, ... formed on the light source substrate 13A are designated as connection portions 21A1, 21A2, ..., 21A10, then the first wiring portions 19, 19, ... having connection portions 21A1, 21A2, ..., 21A10 are connected to the light-emitting elements 14A1, 14A2, ..., 14A10, respectively.

[0074] On the light source substrate 13A, for example, connection parts 21A8, 21A6, 21A4, 21A2, and 21A10 are arranged in order from left to right at the upper end, and connection parts 21A7, 21A5, 21A3, 21A1, and 21A9 are arranged in order from left to right at the lower end.

[0075] Similarly, if the connection parts 21, 21, ... of the first wiring parts 19, 19, ... formed on the light source substrate 13B are designated as connection parts 21B1, 21B2, ..., 21B10, then the first wiring parts 19, 19, ... each having connection parts 21B1, 21B2, ..., 21B10 are connected to the light-emitting elements 14B1, 14B2, ..., 14B10, respectively. On the light source substrate 13B, for example, connection parts 21B8, 21B6, 21B4, 21B2, 21B10 are arranged from left to right at the upper end, and connection parts 21B7, 21B5, 21B3, 21B1, 21B9 are arranged from left to right at the lower end.

[0076] The same arrangement is maintained in the connection portions 21, 21, ... of the first wiring portions 19, 19, ... formed on the light source substrates 13C to 13F.

[0077] The board-side connector 15 has an equal number of electrodes 25, 25, ... arranged on both the upper and lower sides, with seven electrodes provided for each connection section 21, 21, .... Therefore, for example, there are 35 electrodes 25, 25, ... arranged on the upper side and 35 electrodes 25, 25, ... arranged on the lower side.

[0078] Similarly, the cable-side connector 17 also has connection terminals 29, 29, ... on both the upper and lower sides, for example, 35 on the upper side arranged horizontally and 35 on the lower side arranged horizontally.

[0079] The flexible flat cable 16 has a number of conductor sections 27, 27, ... equal to more than half the number of electrodes 25, 25, ... on the board-side connector 15. The conductor sections 27, 27, ... are designated as conductor section 27-1, 27-2, 27-3, ... from left to right.

[0080] In the above configuration, as a first example of the electrical connection state in the lighting device 50, we will specifically describe it mainly with reference to a part of the lighting device 50 shown in Figures 11 to 13.

[0081] Figure 11 is a conceptual diagram of the portion of the light source substrate 13A and light source substrate 13B that includes the light-emitting elements 14A9, 14A10, 14B9, and 14B10; Figure 12 is a conceptual diagram of the portion of the light source substrate 13C and light source substrate 13D that includes the light-emitting elements 14C9, 14C10, 14D9, and 14D10; and Figure 13 is a conceptual diagram of the portion of the light source substrate 13E and light source substrate 13F that includes the light-emitting elements 14E9, 14E10, 14F9, and 14F10.

[0082] The first wiring section 19 formed on the light source substrate 13 is electrically connected to the conductor section 27 of the flexible flat cable 16 via the electrodes 25 of the substrate-side connector 15 and the connection terminals 29 of the cable-side connector 17. Each connection point 21 of the first wiring section 19 is connected to seven electrodes 25, 25, ..., and each of these seven electrodes 25, 25, ... is connected to a connection terminal 29, 29, ..., but of the connection terminals 29, 29, ... connected to each of the seven electrodes 25, 25, ..., only one connection terminal 29 is connected to one conductor section 27 via a connection hole 26a. Therefore, each connection point 21 of one first wiring section 19 is electrically connected to one conductor section 27 via the electrodes 25 of the substrate-side connector 15 and the connection terminal 29 of the cable-side connector 17.

[0083] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13A, as shown in Figure 11, for example, connection section 21A8 is electrically connected to conductor section 27-2, connection section 21A6 to conductor section 27-9, connection section 21A4 to conductor section 27-17, connection section 21A2 to conductor section 27-24, and connection section 21A10 to conductor section 27-31. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13A, for example, connection section 21A7 is electrically connected to conductor section 27-1, connection section 21A5 to conductor section 27-8, connection section 21A3 to conductor section 27-16, connection section 21A1 to conductor section 27-23, and connection section 21A9 to conductor section 27-30.

[0084] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13B, for example, connection section 21B8 is electrically connected to conductor section 27-3, connection section 21B6 to conductor section 27-10, connection section 21B4 to conductor section 27-18, connection section 21B2 to conductor section 27-25, and connection section 21B10 to conductor section 27-32. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13B, for example, connection section 21B7 is electrically connected to conductor section 27-2, connection section 21B5 to conductor section 27-9, connection section 21B3 to conductor section 27-17, connection section 21B1 to conductor section 27-24, and connection section 21B9 to conductor section 27-31.

[0085] Thus, in the first example, both connection part 21A8 and connection part 21B7 are electrically connected to conductor part 27-2, both connection part 21A6 and connection part 21B5 are electrically connected to conductor part 27-9, both connection part 21A4 and connection part 21B3 are electrically connected to conductor part 27-17, both connection part 21A2 and connection part 21B1 are electrically connected to conductor part 27-24, and both connection part 21A10 and connection part 21B9 are electrically connected to conductor part 27-31.

[0086] Therefore, light-emitting elements 14A8 and 14B7 are connected in series via the conductor 27-2, light-emitting elements 14A6 and 14B5 are connected in series via the conductor 27-9, light-emitting elements 14A4 and 14B3 are connected in series via the conductor 27-17, light-emitting elements 14A2 and 14B1 are connected in series via the conductor 27-24, and light-emitting elements 14A10 and 14B9 are connected in series via the conductor 27-31.

[0087] Furthermore, as described above, in the lighting device 50, two adjacent pairs of light-emitting elements 14, 14 are connected in series by the second wiring section 20, so that four pairs of light-emitting elements 14, 14, ... are each connected in series. That is, light-emitting elements 14A1, 14A2, 14B1, and 14B2 are connected in series, light-emitting elements 14A3, 14A4, 14B3, and 14B4 are connected in series, light-emitting elements 14A5, 14A6, 14B5, and 14B6 are connected in series, light-emitting elements 14A7, 14A8, 14B7, and 14B8 are connected in series, and light-emitting elements 14A9, 14A10, 14B9, and 14B10 are connected in series.

[0088] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13C, as shown in Figure 12, for example, connection section 21C8 is electrically connected to conductor section 27-4, connection section 21C6 to conductor section 27-11, connection section 21C4 to conductor section 27-19, connection section 21C2 to conductor section 27-26, and connection section 21C10 to conductor section 27-33. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13C, for example, connection section 21C7 is electrically connected to conductor section 27-1, connection section 21C5 to conductor section 27-8, connection section 21C3 to conductor section 27-16, connection section 21C1 to conductor section 27-23, and connection section 21C9 to conductor section 27-30.

[0089] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13D, for example, connection section 21D8 is electrically connected to conductor section 27-5, connection section 21D6 to conductor section 27-12, connection section 21D4 to conductor section 27-20, connection section 21D2 to conductor section 27-27, and connection section 21D10 to conductor section 27-34. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13D, for example, connection section 21D7 is electrically connected to conductor section 27-4, connection section 21D5 to conductor section 27-11, connection section 21D3 to conductor section 27-19, connection section 21D1 to conductor section 27-26, and connection section 21D9 to conductor section 27-33.

[0090] Therefore, in the light-emitting elements 14, 14, ... arranged on the light source substrate 13C and the light source substrate 13D respectively, light-emitting elements 14C1, 14C2, 14D1, and 14D2 are connected in series, light-emitting elements 14C3, 14C4, 14D3, and 14D4 are connected in series, light-emitting elements 14C5, 14C6, 14D5, and 14D6 are connected in series, light-emitting elements 14C7, 14C8, 14D7, and 14D8 are connected in series, and light-emitting elements 14C9, 14C10, 14D9, and 14D10 are connected in series.

[0091] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13E, as shown in Figure 13, for example, connection section 21E8 is electrically connected to conductor section 27-6, connection section 21E6 to conductor section 27-13, connection section 21E4 to conductor section 27-21, connection section 21E2 to conductor section 27-28, and connection section 21E10 to conductor section 27-35. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13E, for example, connection section 21E7 is electrically connected to conductor section 27-1, connection section 21E5 to conductor section 27-8, connection section 21E3 to conductor section 27-16, connection section 21E1 to conductor section 27-23, and connection section 21E9 to conductor section 27-30.

[0092] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13F, for example, connection section 21F8 is electrically connected to conductor section 27-7, connection section 21F6 to conductor section 27-14, connection section 21F4 to conductor section 27-22, connection section 21F2 to conductor section 27-29, and connection section 21F10 to conductor section 27-36. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13F, for example, connection section 21F7 is electrically connected to conductor section 27-6, connection section 21F5 to conductor section 27-13, connection section 21F3 to conductor section 27-21, connection section 21F1 to conductor section 27-28, and connection section 21F9 to conductor section 27-35.

[0093] Therefore, in the light-emitting elements 14, 14, ... arranged on the light source substrate 13E and the light source substrate 13F respectively, light-emitting elements 14E1, 14E2, 14F1, and 14F2 are connected in series, light-emitting elements 14E3, 14E4, 14F3, and 14F4 are connected in series, light-emitting elements 14E5, 14E6, 14F5, and 14F6 are connected in series, light-emitting elements 14E7, 14E8, 14F7, and 14F8 are connected in series, and light-emitting elements 14E9, 14E10, 14F9, and 14F10 are connected in series.

[0094] As described above, in the first example, two light-emitting elements 14, 14, ... arranged on different light source substrates 13, 13 are connected in series via a substrate-side connector 15, a cable-side connector 17, and a flexible flat cable 16.

[0095] Therefore, since the light-emitting elements 14, 14, ... arranged on different light source substrates 13, 13 are switched on and off simultaneously, the degree of freedom in controlling the light-emitting elements 14, 14, ... arranged on different light source substrates 13, 13, ... can be improved.

[0096] Furthermore, since the four light-emitting elements 14, 14, ... adjacent to each other in the vertical, horizontal, and vertical directions are connected in series, the positions of these four light-emitting elements 14, 14, ... approximate the shape of a single pixel.

[0097] Therefore, it is particularly useful when performing so-called local dimming, a technique that divides the screen into sections and controls the light intensity of each section to adjust the light intensity of the light-emitting elements to match the brightness of the image displayed in each section. This can significantly improve the contrast of the image displayed on the screen and reduce the power consumption of the lighting device 50.

[0098] In the first example described above, four adjacent light-emitting elements 14, 14, ... are shown connected in series. However, the number of light-emitting elements 14 connected in series is not limited to four and can be any number. Furthermore, the light-emitting elements 14, 14, ... connected in series may be located at any position. In addition, the display device 1 may be configured such that the light-emitting elements 14, 14, ... are not connected in series, and all light-emitting elements 14, 14, ... are individually switched on and off.

[0099] In the first example, the cable-side connector 17 is provided with multiple connection terminals 29, 29, ..., and connection holes 26a, 26a, ... are formed in the insulator 26 of the flexible flat cable 16, exposing some of the conductor portions 27, 27, ..., and the connection terminals 29, 29, ... are inserted into the connection holes 26a, 26a, ... to connect to the conductor portions 27, 27, ....

[0100] Therefore, when the connection terminal 29 is inserted into the connection hole 26a, it is connected to the conductor portion 27, and some of the multiple conductor portions 27 are electrically connected to the first wiring portion 19. This makes it easy to connect the conductor portion 27 to the first wiring portion 19 and to insulate the conductor portion 27 from the first wiring portion 19.

[0101] Furthermore, by forming connection holes 26a in the insulator 26 of the flexible flat cable 16 to connect and insulate the conductor portion 27 and the first wiring portion 19, it is not necessary to change the wiring patterns 18, 18, ... of the light source substrates 13, 13, ... for each light source substrate 13, 13, .... Therefore, it becomes possible to connect the first wiring portion 19, 19, ... and the conductor portion 27, 27, ... using the same light source substrate 13, 13, ..., thereby reducing the manufacturing cost of the lighting device 50.

[0102] In addition, the above example shows how a connection hole 26a is formed in the flexible flat cable 16 to connect and insulate the conductor portion 27 from the first wiring portion 19. However, it is also possible to provide electrodes 25, 25, ... only at the positions where they are connected to the first wiring portions 19, 19, ... on the board-side connector 15, and to connect some of the electrodes 25, 25, ... to which the connection terminals 29, 29, ... are connected (see Figure 14).

[0103] In this way, the cable-side connector 17 is provided with connection terminals 29, 29, ... which are connected to multiple conductor sections 27, 27, ... respectively, and the board-side connector 15 is provided with connection terminals 29, 29, ... which are connected to some of the electrodes 25, 25, ... so that the connection terminals 29, 29, ... are connected to the electrodes 25, 25, ... and some of the conductor sections 27, 27, ... are electrically connected to the first wiring section 19, 19, ...

[0104] Therefore, since the presence or absence of electrodes 25 on the connection terminal 29 enables the connection of the conductor portion 27 to the first wiring portion 19 and the insulation of the conductor portion 27 to the first wiring portion 19, it becomes possible to use multiple light source substrates 13, 13, ... having the same wiring pattern 18, 18, ..., thereby reducing the manufacturing cost of the lighting device 50.

[0105] Conversely, it is also possible to provide connection terminals 29, 29, ... on the cable-side connector 17 at positions that connect only to electrodes 25, 25, ... connected to the first wiring sections 19, 19, ..., and to configure the cable-side connector 17 so that connection terminals 29, 29, ... are connected to some of the electrodes 25, 25, ....

[0106] <Second example in electrical connection state> Next, a second example of the electrical connection state in the lighting device 50 will be described (see Figures 15 to 19).

[0107] Furthermore, the second example of the electrical connection state shown below differs from the first example of the electrical connection state described above only in that all of the connection terminals 29, 29, ... of the cable-side connector 17 are connected to the conductor portions 27, 27, ... of the flexible flat cable 16 via connection holes 26a, 26a, ..., and the wiring patterns 18, 18, ... are different for each light source substrate 13, 13, .... Therefore, for the second example, only the parts that differ from the first example will be described in detail, and other parts will be described or omitted, using the same reference numerals as those used for similar parts in the first example.

[0108] In the second example of the electrical connection state, the left-right direction will be described from a front view. Also, the areas shown in a textured or blacked-out area in Figures 15 to 19 indicate areas where electrical connections are made.

[0109] If the connection portions 21, 21, ... of the first wiring portions 19, 19, ... formed on the light source substrate 13A are designated as connection portions 21A1, 21A2, ..., 21A10, then the first wiring portions 19, 19, ... having connection portions 21A1, 21A2, ..., 21A10 are connected to the light-emitting elements 14A1, 14A2, ..., 14A10, respectively.

[0110] Furthermore, connection parts 21A1, 21A3, 21A5, 21A7, and 21A9 are common to all components.

[0111] On the light source substrate 13A, for example, connection parts 21A8, 21A6, 21A4, 21A2, and 21A10 are arranged in order from left to right at the upper end, and connection parts 21A1, 21A3, 21A5, 21A7, and 21A9 are common at the lower end.

[0112] Similarly, if the connection parts 21, 21, ... of the first wiring parts 19, 19, ... formed on the light source substrate 13B are designated as connection parts 21B1, 21B2, ..., 21B10, then the first wiring parts 19, 19, ... each having connection parts 21B1, 21B2, ..., 21B10 are connected to the light-emitting elements 14B1, 14B2, ..., 14B10, respectively. On the light source substrate 13, for example, connection parts 21B8, 21B6, 21B4, 21B2, 21B10 are arranged from left to right at the upper end, and connection parts 21B7, 21B5, 21B3, 21B1, 21B9 are arranged from left to right at the lower end.

[0113] Hereinafter, the connection portions of the first wiring sections 19, 19, ... formed on the light source substrate 13C and the light source substrate 13D are configured in the same way as the connection portions of the first wiring sections 19, 19, ... formed on the light source substrate 13A and the light source substrate 13B, respectively. Similarly, the connection portions of the first wiring sections 19, 19, ... formed on the light source substrate 13E and the light source substrate 13F are configured in the same way as the connection portions of the first wiring sections 19, 19, ... formed on the light source substrate 13A and the light source substrate 13B, respectively.

[0114] The board-side connector 15 has electrodes 25, 25, ... arranged in equal numbers on both the upper and lower sides, for example, 34 electrodes arranged on the upper side and 34 electrodes arranged on the lower side.

[0115] Similarly, the cable-side connector 17 also has connection terminals 29, 29, ... on both the upper and lower sides, for example, 34 on the upper side arranged horizontally and 34 on the lower side arranged horizontally.

[0116] In the above configuration, a second example of the electrical connection state in the lighting device 50 will be specifically described, mainly with reference to a part of the lighting device 50 shown in Figures 17 to 19.

[0117] Figure 17 is a conceptual diagram of the portion of the light source substrate 13A and light source substrate 13B that includes the light-emitting elements 14A9, 14A10, 14B9, and 14B10; Figure 18 is a conceptual diagram of the portion of the light source substrate 13C and light source substrate 13D that includes the light-emitting elements 14C9, 14C10, 14D9, and 14D10; and Figure 19 is a conceptual diagram of the portion of the light source substrate 13E and light source substrate 13F that includes the light-emitting elements 14E9, 14E10, 14F9, and 14F10.

[0118] The first wiring section 19 formed on the light source substrate 13 is electrically connected to the conductor section 27 of the flexible flat cable 16 via the electrodes 25 of the substrate-side connector 15 and the connection terminals 29 of the cable-side connector 17.

[0119] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13A, as shown in Figure 17, for example, connection section 21A8 is electrically connected to conductor section 27-1, connection section 21A6 to conductor section 27-2, connection section 21A4 to conductor section 27-3, connection section 21A2 to conductor section 27-4, and connection section 21A10 to conductor section 27-5. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13A, for example, common connection sections 21A1, 21A3, 21A5, 21A7, and 21A9 are electrically connected to conductor sections 27-32, 27-33, and 27-34.

[0120] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13B, for example, connection section 21B8 is electrically connected to conductor section 27-6, connection section 21B6 to conductor section 27-7, connection section 21B4 to conductor section 27-8, connection section 21B2 to conductor section 27-9, and connection section 21B10 to conductor section 27-10. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13B, for example, connection section 21B7 is electrically connected to conductor section 27-1, connection section 21B5 to conductor section 27-2, connection section 21B3 to conductor section 27-3, connection section 21B1 to conductor section 27-4, and connection section 21B9 to conductor section 27-5.

[0121] Thus, in the second example, both connection part 21A8 and connection part 21B7 are electrically connected to conductor part 27-1, both connection part 21A6 and connection part 21B5 are electrically connected to conductor part 27-2, both connection part 21A4 and connection part 21B3 are electrically connected to conductor part 27-3, both connection part 21A2 and connection part 21B1 are electrically connected to conductor part 27-4, and both connection part 21A10 and connection part 21B9 are electrically connected to conductor part 27-5.

[0122] Therefore, light-emitting elements 14A8 and 14B7 are connected in series via conductor 27-1, light-emitting elements 14A6 and 14B5 are connected in series via conductor 27-2, light-emitting elements 14A4 and 14B3 are connected in series via conductor 27-3, light-emitting elements 14A2 and 14B1 are connected in series via conductor 27-4, and light-emitting elements 14A10 and 14B9 are connected in series via conductor 27-5.

[0123] Furthermore, in the lighting device 50, two adjacent pairs of light-emitting elements 14, 14 are connected in series by the second wiring section 20, so that four pairs of light-emitting elements 14, 14, ... are each connected in series. That is, light-emitting elements 14A1, 14A2, 14B1, and 14B2 are connected in series, light-emitting elements 14A3, 14A4, 14B3, and 14B4 are connected in series, light-emitting elements 14A5, 14A6, 14B5, and 14B6 are connected in series, light-emitting elements 14A7, 14A8, 14B7, and 14B8 are connected in series, and light-emitting elements 14A9, 14A10, 14B9, and 14B10 are connected in series.

[0124] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13C, as shown in Figure 18, for example, connection section 21C8 is electrically connected to conductor section 27-11, connection section 21C6 to conductor section 27-12, connection section 21C4 to conductor section 27-13, connection section 21C2 to conductor section 27-14, and connection section 21C10 to conductor section 27-15. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13C, for example, common connection sections 21C1, 21C3, 21C5, 21C7, and 21C9 are electrically connected to conductor sections 27-32, 27-33, and 27-34.

[0125] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13D, for example, connection section 21D8 is electrically connected to conductor section 27-16, connection section 21D6 to conductor section 27-17, connection section 21D4 to conductor section 27-18, connection section 21D2 to conductor section 27-19, and connection section 21D10 to conductor section 27-20. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13D, for example, connection section 21D7 is electrically connected to conductor section 27-11, connection section 21D5 to conductor section 27-12, connection section 21D3 to conductor section 27-13, connection section 21D1 to conductor section 27-14, and connection section 21D9 to conductor section 27-15.

[0126] Therefore, in the light-emitting elements 14, 14, ... arranged on the light source substrate 13C and the light source substrate 13D respectively, light-emitting elements 14C1, 14C2, 14D1, and 14D2 are connected in series, light-emitting elements 14C3, 14C4, 14D3, and 14D4 are connected in series, light-emitting elements 14C5, 14C6, 14D5, and 14D6 are connected in series, light-emitting elements 14C7, 14C8, 14D7, and 14D8 are connected in series, and light-emitting elements 14C9, 14C10, 14D9, and 14D10 are connected in series.

[0127] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13E, as shown in Figure 19, for example, connection section 21E8 is electrically connected to conductor section 27-21, connection section 21E6 to conductor section 27-22, connection section 21E4 to conductor section 27-23, connection section 21E2 to conductor section 27-24, and connection section 21E10 to conductor section 27-25. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13E, for example, common connection sections 21E1, 21E3, 21E5, 21E7, and 21E9 are electrically connected to conductor sections 27-32, 27-33, and 27-34.

[0128] In the first wiring sections 19, 19, ... formed at the upper end of the light source substrate 13F, for example, connection section 21F8 is electrically connected to conductor section 27-26, connection section 21F6 to conductor section 27-27, connection section 21F4 to conductor section 27-28, connection section 21F2 to conductor section 27-29, and connection section 21F10 to conductor section 27-30. In addition, in the first wiring sections 19, 19, ... formed at the lower end of the light source substrate 13F, for example, connection section 21F7 is electrically connected to conductor section 27-21, connection section 21F5 to conductor section 27-22, connection section 21F3 to conductor section 27-23, connection section 21F1 to conductor section 27-24, and connection section 21F9 to conductor section 27-25.

[0129] Therefore, in the light-emitting elements 14, 14, ... arranged on the light source substrate 13E and the light source substrate 13F respectively, light-emitting elements 14E1, 14E2, 14F1, and 14F2 are connected in series, light-emitting elements 14E3, 14E4, 14F3, and 14F4 are connected in series, light-emitting elements 14E5, 14E6, 14F5, and 14F6 are connected in series, light-emitting elements 14E7, 14E8, 14F7, and 14F8 are connected in series, and light-emitting elements 14E9, 14E10, 14F9, and 14F10 are connected in series.

[0130] Thus, in this second example, as in the first example, two light-emitting elements 14, 14, ... arranged on different light source substrates 13, 13 are connected in series via a substrate-side connector 15, a cable-side connector 17, and a flexible flat cable 16.

[0131] Therefore, since the light-emitting elements 14, 14, ... arranged on different light source substrates 13, 13 are switched on and off simultaneously, the degree of freedom in controlling the light-emitting elements 14, 14, ... arranged on different light source substrates 13, 13, ... can be improved.

[0132] Furthermore, since the four light-emitting elements 14, 14, ... adjacent to each other in the vertical, horizontal, and vertical directions are connected in series, the positions of these four light-emitting elements 14, 14, ... approximate the shape of a single pixel.

[0133] Therefore, it is particularly useful when performing local dimming, as it can significantly improve the contrast of the image displayed on the screen and reduce the power consumption of the lighting device 50.

[0134] In the second example described above, four adjacent light-emitting elements 14, 14, ... are shown connected in series. However, the number of light-emitting elements 14 connected in series is not limited to four and can be any number. Furthermore, the light-emitting elements 14, 14, ... connected in series may be located at any position. In addition, the display device 1 may be configured such that the light-emitting elements 14, 14, ... are not connected in series, and all light-emitting elements 14, 14, ... are individually switched on and off.

[0135] In the second example, each light source substrate 13, 13, ... has a different wiring pattern 18, 18, ..., and at least one of the first wiring sections 19, 19, ... of each light source substrate 13, 13, ... with a different wiring pattern 18, 18, ... is connected to a different conductor section 27, 27, ....

[0136] Therefore, due to the differences in the wiring patterns 18, the first wiring section 19 is connected to different conductor sections 27, and the connection between the conductor section 27 and the first wiring section 19 and the insulation between the conductor section 27 and the wiring section are performed. As a result, it becomes possible to use multiple board-side connectors 15, 15, ... and cable-side connectors 17, 17, ... which have the same structure, thereby reducing the manufacturing cost of the lighting device 50.

[0137] <Summary> As described above, in the display device 1 and the lighting device 50, some of the multiple conductor parts 27, 27, ... are electrically connected to the first wiring parts 19, 19, ... of the light source substrate 13, 13, ... via the cable-side connector 17 and the substrate-side connector 15.

[0138] Therefore, for each of the first wiring sections 19, 19, ..., some of the multiple conductor sections 27, 27, ... in the flexible flat cable 16 connected to the control board 5 are electrically connected to each of the light source substrates 13, 13, ... via the cable-side connector 17 and the board-side connector 15, so that the multiple light source substrates 13, 13, ... are connected to the control board 5 via the flexible flat cable 16.

[0139] In the display device 1 and the lighting device 50, the connection between the light source substrates 13, 13, ... and the control board 5 is made by a highly flexible flat cable 16. Therefore, even if the light source substrates 13, 13, ... and the control board 5 expand or contract due to temperature changes, causing a misalignment between them, the flexible flat cable 16 sufficiently absorbs the misalignment, ensuring a good connection state at each connection point from the light source substrates 13, 13, ... to the control board 5.

[0140] Furthermore, since some of the multiple conductor sections 27, 27, ... for each light source substrate 13, 13, ... are connected to the first wiring section 19, 19, ..., the number of flexible flat cables 16 required is reduced, and the flexible flat cables 16 are thin and inexpensive connection means, contributing to the miniaturization of the display device 1 and the lighting device 50 and the reduction of manufacturing costs.

[0141] This makes it possible to ensure a good connection between the light source substrates 13, 13, ... and the control board 5 in the display device 1 and the lighting device 50 without increasing manufacturing costs.

[0142] Furthermore, since multiple light source substrates 13, 13, ... are connected to the control board 5 via a flexible flat cable 16, on / off control of the light-emitting elements 14, 14, ... can be performed while miniaturizing the display device 1 and the lighting device 50 and reducing manufacturing costs.

[0143] Furthermore, since multiple light source substrates 13, 13, ... are connected to the flexible flat cable 16 via substrate-side connectors 15, 15, ... and cable-side connectors 17, 17, ..., the assembly of the lighting device 50 can be easily performed without increasing the number of parts, and electrical connections between the light source substrates 13, 13, ... can be easily made.

[0144] Furthermore, multiple light source substrates 13, 13, ... are arranged spaced apart in a direction perpendicular to the longitudinal direction, multiple light-emitting elements 14, 14, ... are arranged spaced apart in the longitudinal direction of the light source substrates 13, 13, ..., and multiple cable-side connectors 17, 17, ... are connected to substrate-side connectors 15, 15, ... which are attached to the light source substrates 13, 13, ... respectively.

[0145] Therefore, since the multiple light source substrates 13, 13, ... and the flexible flat cable 16 are arranged orthogonally, it is possible to save space in terms of the arrangement space required for the multiple light source substrates 13, 13, ... and the flexible flat cable 16.

[0146] <Another shape of flexible flat cable> Below, we describe a flexible flat cable 16X, which is an example of a different shape from the flexible flat cable 16 (see Figure 20).

[0147] The flexible flat cable 16X is connected to multiple light source boards 13, 13, ... via cable-side connectors 17, 17, ... and board-side connectors 15, 15, ....

[0148] The flexible flat cable 16X is formed in a sheet-like shape and has a stepped structure in which the width changes from left to right as it extends along its length. The flexible flat cable 16X is composed of width-difference sections 16a, 16b, ..., 16f, whose left and right widths differ depending on the number of light source substrates 13, 13, ... connected to it.

[0149] The number of conductor sections 27, 27, ... formed in the width-difference sections 16a, 16b, ..., 16f is determined according to the width of the left and right sections, with the fewest number of conductor sections 27, 27, ... formed in the narrowest width-difference section 16a, and the most number of conductor sections 27, 27, ... formed in the widest width-difference section 16f.

[0150] In such a flexible flat cable 16X, the number of conductor sections 27, 27, ... that can be electrically connected to the first wiring sections 19, 19, ... of the light source substrate 13 increases as the width of the left and right sections 16a, 16b, ..., 16f increases.

[0151] In the lighting device 50, as described above, since some of the electrically connected conductors 27, 27, ... differ for each light source substrate 13, 13, ..., fewer conductors 27, 27, ... are needed for each light source substrate 13 that is located farther from the control board 5. For example, in the example shown in Figure 19 above, the number of conductors 27 required for the light source substrate 13E is 8 in total: 5 conductors 27-21 to 25 and 3 conductors 27-32 to 34. The number of conductors 27 required for the light source substrate 13F is 13 in total: 5 conductors 27-21 to 25, 5 conductors 27-26 to 30, and 3 conductors 27-32 to 34 that are connected to the control board 5. Therefore, in this example, 5 conductors 27, 27, ... are unnecessary for each light source substrate 13 that is located farther from the control board 5.

[0152] Based on this configuration, the flexible flat cable 16X has fewer conductor sections 27, 27, ... in the portion corresponding to the light source substrates 13, 13, ... located further away from the control board 5, and the width from left to right is reduced accordingly. The portion with the fewest conductor sections 27, 27, ... formed in the width-difference section 16a, which is furthest from the control board 5, and the portion with the most conductor sections 27, 27, ... formed in the width-difference section 16f, which is closest to the control board 5.

[0153] Therefore, by using the flexible flat cable 16X, it is possible to ensure an efficient connection to the light source substrates 13, 13, ... and to miniaturize the flexible flat cable.

[0154] Furthermore, in the flexible flat cable 16X, since some of the conductor sections 27, 27, ... are electrically connected to the cable-side connectors 17, 17, ..., each cable-side connector 17, 17, ... may be provided with the same number of connection terminals 29, 29, ... as the number of electrically connected conductor sections 27, 27, .... In this case, as shown in Figure 20, by changing the mounting position of the cable-side connectors 17, 17, ... in the left-right direction for each width difference section 16a, 16b, ..., 16f, it becomes possible to electrically connect the connection terminals 29, 29, ... regardless of the connection position with the conductor sections 27, 27, ... for each width difference section 16a, 16b, ..., 16f. Figure 20 shows an example of the connection positions of the conductor sections 27, 27, ... and connection terminals 29, 29, ... at each of the width-difference sections 16a, 16b, ..., 16f, as connection positions 29x, 29x, .... Therefore, in this example, connection terminals 29, 29, ... are provided only at connection position 29x of the cable-side connector 17.

[0155] When using the flexible flat cable 16X in this way, it is possible to use the same cable-side connector 17, 17, ... by changing the mounting position of the cable-side connector 17, 17, ... in the left-right direction for each width difference section 16a, 16b, ..., 16f. Therefore, it is not necessary to form different cable-side connectors 17, 17, ... depending on the connection position with the conductor section 27, 27, ..., and the manufacturing cost of the lighting device 50 can be reduced.

[0156] Furthermore, even when using the flexible flat cable 16X, it is possible to use a cable-side connector 17 (see Figure 5) that has a number of connection terminals 29, 29, ... corresponding to the number of conductor sections 27, 27, .... In this case as well, it is possible to use the same cable-side connectors 17, 17, ....

[0157] Furthermore, the Flexible Flat Cable 16X can be used in a curved state in the width direction, and it can also be used in a curved state in the thickness direction.

[0158] <Other> Next, the structure of other light source substrates will be described (see Figures 21 to 25). Note that, for the sake of simplicity, the light source substrate and light-emitting element are simplified in the figures referenced in the following explanations of the structures of other light source substrates.

[0159] The light source substrates 30, 30, ... are mounted on the back chassis 4 with their longitudinal direction, for example, in the vertical direction, spaced apart from each other on the left and right (see Figure 21). The light source substrate 30 has light-emitting elements 31, 31, ... arranged at equal intervals vertically.

[0160] Inside the light source substrate 30, fluid spaces 30a, 30a, ... are formed, extending vertically and spaced apart from each other on the left and right (see Figure 22). The fluid spaces 30a are formed on the light source substrate 30, for example, from a position near the top to a position near the bottom.

[0161] Each of the fluid spaces 30a, 30a, ... is sealed with a working fluid 32, 32, ... (see Figure 23). The working fluid 32 has the property of changing from a liquid to a gas when its temperature rises to a certain temperature, and changing from a gas to a liquid when its temperature falls to a certain temperature. The working fluid 32 does not seal the entire fluid space 30a, but only an amount corresponding to a part of the volume of the fluid space 30a is sealed inside. Therefore, in its liquid state, the working fluid 32 is sealed in the lower part of the fluid space 30a by gravity.

[0162] When light is emitted from the light-emitting elements 31, 31, ..., the light-emitting elements 31, 31, ... and the light source substrates 30, 30, ... generate heat, and this heat increases the temperatures of the light-emitting elements 31, 31, ..., the light source substrates 30, 30, ... and the working fluid 32, 32, .... As the temperature of the working fluid 32 rises, the working fluid 32 changes from a liquid to a gas, and the gaseous working fluid 32 flows upward in the fluid space 30a.

[0163] As the working fluid 32 flows upward in the fluid space 30a, the light source substrate 30 and the light-emitting elements 31, 31, ... are cooled by the working fluid 32.

[0164] Therefore, the temperature rise of the light-emitting elements 31, 31, ... is suppressed, and a stable operating state of the light-emitting elements 31, 31, ... can be ensured.

[0165] Furthermore, since the heat in the light-emitting elements 31, 31, ... is dispersed, it becomes possible to drive the light-emitting elements 31, 31, ... with high power, thereby improving the driving efficiency and extending the lifespan of the light-emitting elements 31, 31, ..., and enabling the design of the display device 1 and the lighting device 50 at a low cost.

[0166] Furthermore, since the working fluid 32, 32, ... which functions as a coolant for cooling the light-emitting elements 31, 31, ... is sealed inside the light source substrate 30, there is no need to provide a structure for cooling the light-emitting elements 31, 31, ... outside the light source substrate 30. This makes it possible to improve the driving efficiency and extend the lifespan of the light-emitting elements 31, 31, ... while ensuring a reduction in manufacturing costs and miniaturization of the display device 1 and the lighting device 50.

[0167] In addition, although the above example shows a fluid space 30a formed from a position near the upper end to a position near the lower end of the light source substrate 30, for example, the fluid spaces 30a, 30a, ... may be formed separately in the vertical direction of the light source substrate 30 (see Figure 24). In this case, it is desirable that one fluid space 30a is formed at a position corresponding to at least one light-emitting element 31.

[0168] Because the fluid spaces 30a, 30a, ... are formed separately in the vertical direction, the flow length of each of the working fluids 32, 32, ... which have been vaporized as their temperature rises, is shortened, thereby enabling rapid and efficient cooling of the light-emitting elements 31, 31, ..., etc.

[0169] Furthermore, when the light source substrates 30, 30, ... are mounted on the back chassis 4 in a horizontally elongated state, the fluid spaces 30a, 30a, ... extending vertically may be formed separated to the left and right (see Figure 25).

[0170] In this case as well, the temperature rises and the flow length of each vaporized working fluid 32, 32, ... becomes shorter, so the light-emitting elements 31, 31, ... can be cooled quickly and efficiently.

[0171] Furthermore, a structure in which the light source substrate 30 is mounted horizontally on the back chassis 4 and fluid spaces 30a, 30a, ... extending vertically are formed with space between them on the left and right sides can also be applied to the structure of the light source substrate 30 described above.

[0172] <This technology> This technology can also be configured as follows:

[0173] (1) Multiple light source substrates, each having a wiring pattern composed of multiple wiring sections, Multiple light-emitting elements are arranged on the light source substrate and controlled to turn on and off by a control board, A board-side connector attached to each of the aforementioned multiple light source boards, A flexible flat cable having a multi-core structure with a flat plate-shaped insulator and a plurality of conductor parts arranged in a direction perpendicular to the thickness direction of the insulator, with one end connected to the control board, The flexible flat cable is equipped with a plurality of cable-side connectors that are attached to the board-side connector and coupled to the board-side connector, In the wiring section, for each of the multiple light source substrates, some of the multiple conductors are electrically connected via the cable-side connector and the substrate-side connector. Lighting device.

[0174] (2) Each of the aforementioned multiple light source substrates is formed in a shape having a longitudinal direction and is arranged spaced apart in a direction perpendicular to the longitudinal direction. The plurality of light-emitting elements are arranged spaced apart in the longitudinal direction of the light source substrate, The plurality of cable-side connectors are connected to the board-side connectors that are each attached to the plurality of light source substrates. The lighting device described in (1) above.

[0175] (3) At least two of the light-emitting elements, each positioned on a different light-emitting substrate, are connected in series via the substrate-side connector, the cable-side connector, and the flexible flat cable. The lighting device described in (1) or (2) above.

[0176] (4) Multiple connection terminals are provided on the cable-side connector. The insulator has connection holes formed in it that expose some of the conductive parts among the plurality of conductive parts. Some of the aforementioned connection terminals are inserted into the connection holes, thereby connecting them to the conductor portion. A lighting device as described in any of (1) to (3) above.

[0177] (5) The cable-side connector is provided with multiple connection terminals, each connected to one of the multiple conductor portions. The board-side connector is provided with at least one electrode that is connected to some of the connection terminals among the plurality of connection terminals. A lighting device as described in any of (1) to (3) above.

[0178] (6) The wiring patterns of the aforementioned multiple light source substrates are different, At least one of the wiring sections of the light source substrates with different wiring patterns is connected to a different conductor section. A lighting device as described in any of (1) to (3) above.

[0179] (7) The flexible flat cable is formed in a stepped shape, with its width changing as it extends along its longitudinal direction, and has multiple width-difference sections, the width of which increases as it approaches the control board in the longitudinal direction. Each of the aforementioned multiple width-difference portions is fitted with the cable-side connector. The number of the aforementioned conductive parts is increased in the wider section of the width difference. A lighting device as described in any of (1) to (6) above.

[0180] (8) The cable-side connectors, each having the same configuration, are attached to the aforementioned multiple width-difference sections. The lighting device described in (7) above.

[0181] (9) A display that shows an image on its surface, A back chassis positioned on the side opposite to the display surface of the display, The system comprises a lighting device positioned between the display and the back chassis and functioning as a backlight, The aforementioned lighting device is Multiple light source substrates, each having a wiring pattern composed of multiple wiring sections, Multiple light-emitting elements are arranged on the light source substrate and controlled to turn on and off by a control board, A board-side connector attached to each of the aforementioned multiple light source boards, A flexible flat cable having a multi-core structure with a flat plate-shaped insulator and a plurality of conductor parts arranged in a direction perpendicular to the thickness direction of the insulator, with one end connected to the control board, The flexible flat cable is equipped with a plurality of cable-side connectors that are attached to the board-side connector and coupled to the board-side connector, In the wiring section, for each of the multiple light source substrates, some of the multiple conductors are electrically connected via the cable-side connector and the substrate-side connector. Display device. [Explanation of Symbols]

[0182] 1…Display device, 4…Back chassis, 5…Control board, 7…Display, 7a…Display surface, 13…Light source board, 14…Light-emitting element, 15…Board-side connector, 16…Flexible flat cable, 17…Cable-side connector, 18…Wiring pattern, 19…First wiring section, 20…Second wiring section, 25…Electrode, 26…Insulator, 26a…Connection hole, 27…Conductor section, 29…Connection terminal, 50…Lighting device

Claims

1. Back chassis and The control board mounted on the aforementioned back chassis, A display positioned on the front side of the back chassis and supplied with current from the control board, Multiple rows of light source substrates, each having a wiring pattern including multiple wiring sections, arranged on the back chassis and grouped together, A plurality of light-emitting elements are arranged on the aforementioned light source substrate and controlled by the aforementioned control substrate, A plurality of flexible flat cables arranged in accordance with a group of multiple light source substrates, each having a multi-core structure with a flat plate-shaped insulator and a plurality of conductor portions arranged in a direction perpendicular to the thickness direction of the insulator, and each of the plurality of flexible flat cables connected to the control board, Each of the multiple flexible flat cables is connected to all of the light source substrates in the group of light source substrates corresponding to each of them. Each is attached to a corresponding light source substrate among the multiple rows of light source substrates, and is provided with a plurality of substrate-side connectors connected to the substrate wiring on the light source substrate in order to drive the light-emitting element. Multiple cable-side connectors are provided, which are connected to the flexible flat cable and the board-side connector respectively, and which supply a drive current to the board-side connector for driving the light-emitting element. Some of the multiple conductors are electrically connected to the wiring section for each of the multiple light source substrates via the cable-side connector and the substrate-side connector. Multiple connection terminals are provided on the cable-side connector. The flexible flat cable has connection holes formed in it that expose some of the conductors among the plurality of conductors. Some of the aforementioned connection terminals are inserted into the connection holes, thereby connecting them to the conductor portion. Display device.

2. A back chassis and The control board mounted on the aforementioned back chassis, A display positioned on the front side of the back chassis and supplied with current from the control board, Multiple rows of light source substrates, each having a wiring pattern including multiple wiring sections, arranged on the back chassis and grouped together, A plurality of light-emitting elements are arranged on the aforementioned light source substrate and controlled by the aforementioned control substrate, A plurality of flexible flat cables arranged in accordance with a group of multiple light source substrates, each having a multi-core structure with a flat plate-shaped insulator and a plurality of conductor portions arranged in a direction perpendicular to the thickness direction of the insulator, and each of the plurality of flexible flat cables connected to the control board, Each of the multiple flexible flat cables is connected to all of the light source substrates in the group of light source substrates corresponding to each of them. Each is attached to a corresponding light source substrate among the multiple rows of light source substrates, and is provided with a plurality of substrate-side connectors connected to the substrate wiring on the light source substrate in order to drive the light-emitting element. Multiple cable-side connectors are provided, which are connected to the flexible flat cable and the board-side connector respectively, and which supply a drive current to the board-side connector for driving the light-emitting element. Some of the multiple conductors are electrically connected to the wiring section for each of the multiple light source substrates via the cable-side connector and the substrate-side connector. Multiple connection terminals are provided on the cable-side connector. The cable-side connector is provided with a plurality of connection terminals arranged perpendicular to the flexible flat cable. The aforementioned connection terminal has its tip bent and is connected to the conductor portion. Display device.

3. A back chassis and The control board mounted on the aforementioned back chassis, A display positioned on the front side of the back chassis and supplied with current from the control board, Multiple rows of light source substrates, each having a wiring pattern including multiple wiring sections, arranged on the back chassis and grouped together, A plurality of light-emitting elements are arranged on the aforementioned light source substrate and controlled by the aforementioned control substrate, A plurality of flexible flat cables arranged in accordance with a group of multiple light source substrates, each having a multi-core structure with a flat plate-shaped insulator and a plurality of conductor portions arranged in a direction perpendicular to the thickness direction of the insulator, and each of the plurality of flexible flat cables connected to the control board, Each of the multiple flexible flat cables is connected to all of the light source substrates in the group of light source substrates corresponding to each of them. Each is attached to a corresponding light source substrate among the multiple rows of light source substrates, and is provided with a plurality of substrate-side connectors connected to the substrate wiring on the light source substrate in order to drive the light-emitting element. Multiple cable-side connectors are provided, which are connected to the flexible flat cable and the board-side connector respectively, and which supply a drive current to the board-side connector for driving the light-emitting element. Some of the multiple conductors are electrically connected to the wiring section for each of the multiple light source substrates via the cable-side connector and the substrate-side connector. Multiple connection terminals are provided on the cable-side connector. The cable-side connector has four walls forming a hollow rectangular structure, and multiple connection terminals are provided on the outside of at least two of the four walls. Display device.

4. The aforementioned multiple rows of light source substrates are locally dimmed by the control board. The display device according to any one of claims 1 to 3.

5. The aforementioned multiple rows of light source substrates are locally dimmed by the control board and power consumption is reduced. The display device according to any one of claims 1 to 3.

6. The cable-side connector is provided with a plurality of connection terminals arranged perpendicular to the flexible flat cable. The display device according to claim 1 or claim 3.

7. A cable insertion hole is formed in the back chassis through which the flexible flat cable is inserted. The display device according to any one of claims 1 to 3.

8. A diffuser and a reflective sheet are provided. The diffuser plate is placed between the display and the reflective sheet. The reflective sheet is positioned between the diffuser plate and the back chassis. The display device according to any one of claims 1 to 3.

9. A light-emitting diode was used as the light-emitting element. The display device according to any one of claims 1 to 3.

10. A diffuser plate and support pins are provided. The support pin is located on the front side of the back chassis. The diffuser plate is held by the support pins. The display device according to any one of claims 1 to 3.

11. The aforementioned support pin is made transparent. The display device according to claim 10.

12. The aforementioned light-emitting diodes are connected in series, Local dimming enabled The display device according to claim 9.

13. A circuit configuration is provided that is connected to the control board. The display device according to any one of claims 1 to 3.

14. Current is supplied to the display from the control board via the circuit configuration. The display device according to claim 13.

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