Display 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] The present technology relates to a technical field of an illumination device in which the turning on and off of light-emitting elements arranged on a light source substrate is controlled by a control substrate, and a display device including the same. [Background technology]

[0002] There is a lighting device that includes a plurality of light source substrates, each having a wiring pattern made up of a plurality of wiring sections, and a plurality of light emitting elements that are arranged on the light source substrates and whose lighting is controlled by a control substrate (see, for example, Patent Document 1).

[0003] Such an illumination device is provided in, for example, a display device such as a television receiver or a personal computer. The display device is provided with a display having a display surface on which an image is displayed and a back chassis disposed on the rear side of the display, and the illumination device is disposed, for example, between the display and the back chassis as a backlight.

[0004] In the lighting device described in Patent Document 1, multiple horizontally elongated light source boards are connected to a control board that controls the on / off of light-emitting elements via a relay board, and the relay board is connected to each of the light source boards via multiple connectors.

[0005] However, when light is emitted from the light-emitting element in the above-mentioned lighting device, the light-emitting element and the light source substrate generate heat, and the light source substrate etc. expands or contracts due to temperature changes, which may cause misalignment between the light source substrate and the relay substrate, making it impossible to ensure a good connection between the light source substrate and the relay substrate.

[0006] Therefore, in the lighting device described in Patent Document 1, a misalignment tolerance means is provided in the connector to allow for misalignment between the light source board and the relay board, and the misalignment tolerance means absorbs the misalignment between the light source board and the relay board, ensuring a good connection between the light source board and the relay board and a good connection between the light source board and the control board via the relay board. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2018-98112 Summary of the Invention [Problem to be solved by the invention]

[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 accommodate expansion or contraction due to temperature changes in the light source substrate, etc., it is necessary to increase the size of the connector, which may hinder efforts to reduce manufacturing costs and may result in the lighting device and display device becoming larger.

[0010] Therefore, an object of the present technology is to provide a lighting device and a display device that ensure a good connection between a light source board and a control board without increasing manufacturing costs. [Means for solving the problem]

[0011] First, the lighting device according to the present technology includes a plurality of light source substrates, each having a wiring pattern formed by a plurality of wiring sections; a plurality of light emitting elements arranged on the light source substrates and whose on / off states are controlled by a control substrate; a substrate-side connector attached to each of the plurality of light source substrates; a flexible flat cable having a multi-core structure including a flat insulator and a plurality of conductor sections arranged in a direction perpendicular to the thickness direction of the insulator, and one end of the flexible flat cable connected to the control substrate; and a plurality of cable-side connectors attached to the flexible flat cable and coupled to the substrate-side connector, and in the wiring section, some of the conductor sections of the plurality of conductor sections are electrically connected to the cable-side connector and the substrate-side connector for each of the plurality of light source substrates.

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

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

[0014] This allows the plurality of light source substrates and the flexible flat cable to be arranged so as to intersect at right angles.

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

[0016] As a result, the light emitting elements respectively arranged on the different light source substrates are simultaneously turned on and off.

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

[0018] As a result, the connection terminals are inserted into the connection holes to be connected to the conductor portions, and some of the conductor portions are electrically connected to the wiring portion.

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

[0020] This allows the connection and insulation between the conductor and wiring portions to be determined by the presence or absence of an electrode on the connection terminal, making it possible to use multiple light source substrates having the same wiring pattern.

[0021] Sixth, in the lighting device according 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 the light source substrates having different wiring patterns is connected to a different conductor portion.

[0022] This allows the wiring sections to be connected to different conductor sections due to differences in the wiring patterns, and the conductor sections and wiring sections are connected and insulated from each other, making it possible to use multiple board-side connectors and cable-side connectors with the same structure.

[0023] Seventh, in the lighting device according to the present technology described above, it is desirable that the flexible flat cable be formed in a stepped shape whose width changes along the longitudinal direction and have a plurality of width varying portions whose width increases as the cable approaches the control board in the longitudinal direction, the cable side connectors be attached to each of the plurality of width varying portions, and the number of conductor portions be increased as the width of the width varying portion increases.

[0024] As a result, the flexible flat cable and the plurality of light source substrates are electrically connected via the cable-side connectors attached to the different width portions.

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

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

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

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

[0029] According to this technology, for each light source board, some of the multiple conductor portions in the flexible flat cable connected to the control board are electrically connected to the wiring section via the cable side connector and the board side connector, so that multiple light source boards are connected to the control board via flexible flat cables, ensuring good connection between the light source boards and the control board without increasing manufacturing costs.

[0030] The effects described in this specification are merely examples and are not limiting, and other effects may also be present. [Brief explanation of the drawings]

[0031] [Figure 1] 2 to 25 show an embodiment of a display device and an illumination device according to the present technology, and this figure is a perspective view of the display device. [Figure 2] FIG. 2 is an enlarged cross-sectional view showing a display device with a portion thereof omitted. [Figure 3] FIG. 10 is a front view showing the arrangement of the light source board relative to the back chassis. [Figure 4] FIG. 2 is a front view showing a part of the light source substrate. [Figure 5] FIG. 2 is an exploded perspective view showing a light source board, a board-side connector, a cable-side connector, and a flexible flat cable. [Figure 6] FIG. 2 is an enlarged cross-sectional view of the flexible flat cable. [Figure 7] FIG. 2 is a perspective view showing a part of a flexible flat cable. [Figure 8] FIG. 2 is a perspective view showing a connection terminal of a flexible flat cable and a cable-side connector. [Figure 9] 10 to 14 show a first example of an electrical connection state in a lighting device, and this figure is an enlarged front view showing a part of a light source substrate. [Figure 10] FIG. 2 is an enlarged front view conceptually showing the board-side connector and the flexible flat cable. [Figure 11] 10 is an enlarged front view conceptually showing the connection state between the light source substrate and the flexible flat cable. FIG. [Figure 12] 10 is an enlarged front view conceptually showing a connection state between another light source substrate and a flexible flat cable. FIG. [Figure 13] FIG. 10 is an enlarged front view conceptually showing a connection state between yet another light source substrate and a flexible flat cable. [Figure 14] 10 is a perspective view showing a board-side connector provided with only electrodes connected to a first wiring portion. FIG. [Figure 15] 16 to 19 show a second example of an electrical connection state in a lighting device, and this figure is an enlarged front view showing a part of a light source board. [Figure 16] FIG. 2 is an enlarged front view conceptually showing the board-side connector and the flexible flat cable. [Figure 17] 10 is an enlarged front view conceptually showing the connection state between the light source substrate and the flexible flat cable. FIG. [Figure 18] 10 is an enlarged front view conceptually showing a connection state between another light source substrate and a flexible flat cable. FIG. [Figure 19] FIG. 10 is an enlarged front view conceptually showing a connection state between yet another light source substrate and a flexible flat cable. [Figure 20] 10A and 10B are conceptual diagrams showing examples of other shapes of the flexible flat cable. [Figure 21] 22 to 25 show another structure of the light source board, and this figure is a front view showing the state in which the light source board is attached to the back chassis. [Figure 22] FIG. 2 is a perspective view of a light source substrate, partly shown in cross section. [Figure 23] FIG. 3 is a cross-sectional view showing the working fluid and the like sealed in the light source substrate. [Figure 24] 10 is a front view showing an example in which fluid spaces are formed separately in the up-down direction of the light source substrate. FIG. [Figure 25] 10 is a front view showing an example in which a fluid space extending vertically is formed when the light source board is attached to the back chassis in a landscape state. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0032] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present technology for implementing a lighting device and a display device will be described with reference to the accompanying drawings.

[0033] In the embodiment described below, the display device of the present technology is applied to a television receiver that displays images on a display, and the lighting device of the present technology is applied to a lighting device provided in this television receiver.

[0034] The scope of application of the present technology is not limited to television receivers and lighting devices provided thereto, but can be widely applied to various display devices such as monitors used in personal computers, etc., and lighting devices provided in these various display devices.

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

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

[0037] The display device 1 is formed, for example, in a horizontally long, approximately rectangular shape with a thin thickness in the front-to-back direction (see FIG. 1), and is used by being placed 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 required components arranged in a housing 2 (see FIGS. 1 and 2). The housing 2 has a bezel 3 located on the front side and a back chassis 4 located on the rear side.

[0039] The bezel 3 is formed in a substantially rectangular frame shape.

[0040] The back chassis 4 is formed in the shape of a shallow box that is open at the front. A control board 5 is attached to the back chassis 4, for example, at the center of the rear surface. The control board 5 has the function of supplying current to a display (described later) and controlling the on / off of a 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 back chassis 4 from the rear. The rear cover 6 is formed in a shallow box shape that is open at the front, and the control board 5 is covered by the rear cover 6.

[0042] A display 7 is disposed on the inner periphery of the bezel 3. The display 7 is, for example, a liquid crystal panel formed by laminating glass substrates, polarizing sheets, etc., and its front surface is formed as a display surface 7a on which images are displayed.

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

[0044] A frame-shaped holder 8 is disposed inside the bezel 3. The holder 8 holds a display 7, a plurality of optical sheets 9, 9, . . . and a diffusion plate 10 in this order from the front side.

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

[0046] A reflective sheet 11 is disposed between the diffusion plate 10 and the back chassis 4. The reflective sheet 11 has insertion holes 11a, 11a, . . . formed at intervals in the up, down, left and right directions.

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

[0048] An illumination device 50 is disposed between the diffusion plate 10 and the back chassis 4. The illumination 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 FIG. 3).

[0049] The light source boards 13 are attached to the front surface of the back chassis 4, for example, spaced apart from one another vertically and horizontally. In the lighting device 50, for example, six light source boards 13 are positioned vertically and horizontally as a group G, and four sets G of light source boards 13 are arranged vertically and horizontally. A wiring pattern 18 is formed on the light source board 13, and the wiring pattern 18 is made up of first wiring portions 19 and second wiring portions 20 (see FIG. 4).

[0050] The first wiring portions 19, 19, . . . are provided as connection portions 21, 21, . . . , one end of which is connected to the light emitting elements 14, 14, .

[0051] The first wiring portions 19 are formed at both upper and lower ends of the light source substrate 13, and the second wiring portions 20 are formed in the center of the light source substrate 13 in the up-down direction.

[0052] The light emitting elements 14, 14, ... are arranged spaced apart on the left and right sides on the front surface of the light source substrate 13 (see FIGS. 3 and 4). For example, ten light emitting elements 14, 14, ... are arranged on the light source substrate 13 at equal intervals 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 portion 19 and a second wiring portion 20 (see FIGS. 2 and 4). The light diffusing lens 22 is inserted into an insertion hole 11a of the reflecting sheet 11, and a portion of the light diffusing lens 22 protrudes forward from the reflecting sheet 11.

[0053] Support pins 23, 23, ... are attached to the light source substrate 13 (see FIG. 2). The support pins 23 are formed of a transparent resin material such as polycarbonate. The support pins 23 are attached to portions 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 into the insertion holes 11a of the reflecting sheet 11, and their tips are capable of contacting the rear surface of the diffuser plate 10, and have the function of holding the diffuser plate 10 by suppressing deformation (deflection) of the diffuser plate 10.

[0054] The board-side connectors 15 are attached to portions of the light source boards 13 near one end in the longitudinal direction (see FIG. 5). The board-side connector 15 has a main body 24 formed in the shape of a horizontally elongated, roughly rectangular tube that is penetrated from front to back, and electrodes 25 attached to the main body 24. The internal space of the main body 24 is formed as a coupling hole 24a, and the electrodes 25 are attached to the top and bottom surfaces of the inner circumferential surface of the main body 24, lined up at equal intervals on the left and right.

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

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

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

[0058] The flexible flat cable 16 is connected to the plurality of light source boards 13 via cable-side connectors 17 and board-side connectors 15. One flexible flat cable 16 is connected to a set G of six light source boards 13 (see FIG. 3). Therefore, the lighting device 50 is provided with, for example, four flexible flat cables 16 for four sets, and these four flexible flat cables 16 are arranged side by side vertically and horizontally at positions 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 including a flat insulator 26 and a plurality of conductors 27, 27, ... arranged in a 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 configured by crimping two sheet-like resin substrates with the conductors 27, 27, ... sandwiched between them. 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 conductor portions 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 in the longitudinal direction of the flexible flat cable 16 (see Figure 5). The cable-side connector 17 has a base body 28 formed in a horizontally elongated shape 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 the outer periphery of the base body 28 on both the top and bottom surfaces, side by side and at equal intervals on the left and right.

[0062] The cable-side connector 17 has a base body 28 attached to the flexible flat cable 16. The front ends of the connection terminals 29 are provided as elastically deformable connection spring portions 29a, and the tips of the connection spring portions 29a protrude 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 of the connection terminals 29 are pressed against the insulator 26 or inserted into the connection holes 26a (see FIG. 8). Therefore, the connection spring portions 29a inserted into the connection holes 26a are pressed against and connected to the conductor portions 27, respectively.

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

[0064] Cable-side connector 17 is coupled to board-side connector 15 by inserting base body 28 into coupling hole 24a. Board-side connector 15 and cable-side connector 17 are each provided with, for example, an elastically deformable engaging portion (not shown), and when base body 28 is inserted into coupling hole 24a, the engaging portions engage with each other, thereby maintaining the coupled state of board-side connector 15 and cable-side connector 17.

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

[0066] <Electrical connection status of lighting equipment> Next, a first example of an electrical connection state in the lighting device 50 will be described (see FIGS. 9 to 14). In the first example of the electrical connection state, the left and right directions will be described from a front view. In addition, portions shown in matte or black in FIGS. 9 to 13 indicate portions where electrical connections are made.

[0067] In the lighting device 50, as described above, for example, six light source substrates 13, 13, ... positioned spaced apart vertically are defined as one set G, and four sets of light source substrates 13, 13, ... of one set G are arranged side by side vertically. For example, if one set G is made up of light source substrates 13A, 13B, 13C, 13D, 13E, and 13F in order from the top, each of the light source substrates 13A, 13B, 13C, 13D, 13E, and 13F has, for example, ten light emitting elements 14, 14, ... arranged at equal intervals on the left and right.

[0068] Furthermore, one flexible flat cable 16 is connected to each of the light source boards 13, 13, ... of one set G via board-side connectors 15, 15, ... and cable-side connectors 17, 17, ..., and since the configurations and connection states of the light source boards 13, 13, ..., board-side connectors 15, 15, ..., cable-side connectors 17, 17, ... and flexible flat cables 16 of each set G, G, ... are the same, the connection state for the light source boards 13, 13, ... of one set G will be explained below as an example.

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

[0070] That is, if the ten light-emitting elements 14, 14, ... arranged on the light source substrate 13A are designated, from left to right, as light-emitting elements 14A1, 14A2, 14A3, ..., 14A10, 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 ten light-emitting elements 14, 14, ... arranged on the light source substrate 13B are designated, from left to right, as light-emitting elements 14B1, 14B2, 14B3, ..., 14B10, 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, for 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 respectively connection portions 21A1, 21A2, ..., 21A10, the first wiring portions 19, 19, ... each having connection portions 21A1, 21A2, ..., 21A10 are respectively connected to the light emitting elements 14A1, 14A2, ..., 14A10.

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

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

[0076] Similarly, the connection portions 21, 21, ... of the first wiring portions 19, 19, ... formed on the light source substrates 13C to 13F are also arranged in the same order.

[0077] The board-side connector 15 has the same number of electrodes 25, 25, ... arranged side by side on the left and right sides on both the top and bottom, and for example, seven electrodes are provided on each side according to the connection portions 21, 21, .... Therefore, for example, 35 electrodes 25, 25, ... are arranged side by side on the top side, and 35 electrodes 25, 25, ... are arranged side by side on the bottom side.

[0078] Similarly, the cable-side connector 17 also has connection terminals 29, 29, . . . provided on both the top and bottom sides, for example, 35 on the top side lined up horizontally and 35 on the bottom side lined up horizontally.

[0079] The number of conductor portions 27, 27, ... of the flexible flat cable 16 is more than half the number of electrodes 25, 25, ... of the board-side connector 15. The conductor portions 27, 27, ... are referred to as conductor portions 27-1, 27-2, 27-3, ... from the left.

[0080] In the above configuration, a first 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 FIGS.

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

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

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

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

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

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

[0087] Furthermore, as described above, in lighting device 50, every two adjacent light-emitting elements 14, 14 are connected in series by second wiring portion 20, and therefore every four light-emitting elements 14, 14, ... are 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] 12, in the first wiring portions 19, 19, ... formed at the upper end portion of the light source substrate 13C, for example, the connection portion 21C8 is electrically connected to the conductor portion 27-4, the connection portion 21C6 is electrically connected to the conductor portion 27-11, the connection portion 21C4 is electrically connected to the conductor portion 27-19, the connection portion 21C2 is electrically connected to the conductor portion 27-26, and the connection portion 21C10 is electrically connected to the conductor portion 27-33. Also, in the first wiring portions 19, 19, ... formed at the lower end portion of the light source substrate 13C, for example, the connection portion 21C7 is electrically connected to the conductor portion 27-1, the connection portion 21C5 is electrically connected to the conductor portion 27-8, the connection portion 21C3 is electrically connected to the conductor portion 27-16, the connection portion 21C1 is electrically connected to the conductor portion 27-23, and the connection portion 21C9 is electrically connected to the conductor portion 27-30.

[0089] In the first wiring portions 19, 19, ... formed on the upper end portion of the light source substrate 13D, for example, the connection portion 21D8 is electrically connected to the conductor portion 27-5, the connection portion 21D6 is electrically connected to the conductor portion 27-12, the connection portion 21D4 is electrically connected to the conductor portion 27-20, the connection portion 21D2 is electrically connected to the conductor portion 27-27, and the connection portion 21D10 is electrically connected to the conductor portion 27-34. Also, in the first wiring portions 19, 19, ... formed on the lower end portion of the light source substrate 13D, for example, the connection portion 21D7 is electrically connected to the conductor portion 27-4, the connection portion 21D5 is electrically connected to the conductor portion 27-11, the connection portion 21D3 is electrically connected to the conductor portion 27-19, the connection portion 21D1 is electrically connected to the conductor portion 27-26, and the connection portion 21D9 is electrically connected to the conductor portion 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, the light-emitting elements 14C1, 14C2, 14D1, and 14D2 are connected in series, the light-emitting elements 14C3, 14C4, 14D3, and 14D4 are connected in series, the light-emitting elements 14C5, 14C6, 14D5, and 14D6 are connected in series, the light-emitting elements 14C7, 14C8, 14D7, and 14D8 are connected in series, and the light-emitting elements 14C9, 14C10, 14D9, and 14D10 are connected in series.

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

[0092] In the first wiring portions 19, 19, ... formed at the upper end of the light source substrate 13F, for example, the connection portion 21F8 is electrically connected to the conductor portion 27-7, the connection portion 21F6 is electrically connected to the conductor portion 27-14, the connection portion 21F4 is electrically connected to the conductor portion 27-22, the connection portion 21F2 is electrically connected to the conductor portion 27-29, and the connection portion 21F10 is electrically connected to the conductor portion 27-36. Also, in the first wiring portions 19, 19, ... formed at the lower end of the light source substrate 13F, for example, the connection portion 21F7 is electrically connected to the conductor portion 27-6, the connection portion 21F5 is electrically connected to the conductor portion 27-13, the connection portion 21F3 is electrically connected to the conductor portion 27-21, the connection portion 21F1 is electrically connected to the conductor portion 27-28, and the connection portion 21F9 is electrically connected to the conductor portion 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, the light-emitting elements 14E1, 14E2, 14F1, and 14F2 are connected in series, the light-emitting elements 14E3, 14E4, 14F3, and 14F4 are connected in series, the light-emitting elements 14E5, 14E6, 14F5, and 14F6 are connected in series, the light-emitting elements 14E7, 14E8, 14F7, and 14F8 are connected in series, and the 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, the light-emitting elements 14, 14, ... arranged on the different light source substrates 13, 13 are turned on and off simultaneously, thereby improving the degree of freedom in control of the light-emitting elements 14, 14, ... arranged on the light source substrates 13, 13, ...

[0096] Furthermore, since four adjacent light emitting elements 14, 14, . . . on the top, bottom, left, and right are connected in series, the positions of these four light emitting elements 14, 14, . . . are in a positional relationship that approximates the shape of one pixel.

[0097] Therefore, this is particularly useful when performing so-called local dimming, a technology in which the screen is divided into sections, the light intensity of the light-emitting elements is controlled for each section, and the light intensity of the light-emitting elements is adjusted to match the brightness of the image displayed in each section, making it possible to 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 connected in series, but the number of light-emitting elements 14 connected in series is not limited to four and can be any number, and the light-emitting elements 14, 14, ... connected in series may be located in any positions. Furthermore, the display device 1 may be configured so that the light-emitting elements 14, 14, ... are not connected in series, and all of the light-emitting elements 14, 14, ... are turned on and off individually.

[0099] In addition, in the first example, a plurality of connection terminals 29, 29, ... are provided on the cable side connector 17, connection holes 26a, 26a, ... are formed in the insulator 26 of the flexible flat cable 16 to expose some of the conductor portions 27, 27, ..., and the connection terminals 29, 29, ... are connected to the conductor portions 27, 27, ... by being inserted into the connection holes 26a, 26a, ....

[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, making 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 boards 13, 13, ... for each light source board 13, 13, .... Therefore, it becomes possible to connect the first wiring portions 19, 19, ... and the conductor portions 27, 27, ... using the same light source boards 13, 13, ..., and it is possible to reduce the manufacturing cost of the lighting device 50.

[0102] In the above, an example has been shown in which connection holes 26a are 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 positions on the board-side connector 15 that are connected to the first wiring portions 19, 19, ..., and to connect connection terminals 29, 29, ... to some of the electrodes 25, 25, ... (see Figure 14).

[0103] In this way, the cable side connector 17 is provided with connection terminals 29, 29, ... which are respectively connected to the plurality of conductor portions 27, 27, ..., 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 portions 27, 27, ... are electrically connected to the first wiring portions 19, 19, ....

[0104] Therefore, the connection between the conductor portion 27 and the first wiring portion 19 and the insulation between the conductor portion 27 and the first wiring portion 19 are determined by the presence or absence of an electrode 25 for the connection terminal 29, so 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, ... at positions on the cable side connector 17 that are connected only to the electrodes 25, 25, ... that are connected to the first wiring portions 19, 19, ..., and to configure the connection terminals 29, 29, ... to be connected to some of the electrodes 25, 25, ....

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

[0107] Note that 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 the connection holes 26a, 26a, ... and that the wiring patterns 18, 18, ... are different for each light source board 13, 13, .... Therefore, for the second example, only the parts that are different from the first example will be described in detail, and the other parts will be denoted by the same reference numerals as those denoted by similar parts in the first example, and description thereof will be omitted or simplified.

[0108] In the second example of the electrical connection state, the left and right directions are described from a front view. Also, the matte or black areas in Figures 15 to 19 indicate areas where electrical connections are made. Also, the matte or black areas 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 respectively connection portions 21A1, 21A2, ..., 21A10, the first wiring portions 19, 19, ... each having connection portions 21A1, 21A2, ..., 21A10 are respectively connected to the light emitting elements 14A1, 14A2, ..., 14A10.

[0110] The connecting portions 21A1, 21A3, 21A5, 21A7, and 21A9 are common.

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

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

[0113] Hereinafter, the connection portions of the first wiring portions 19, 19, ... formed on the light source substrate 13C and the light source substrate 13D also have the same configuration as the connection portions of the first wiring portions 19, 19, ... formed on the light source substrate 13A and the light source substrate 13B. Also, the connection portions of the first wiring portions 19, 19, ... formed on the light source substrate 13E and the light source substrate 13F also have the same configuration as the connection portions of the first wiring portions 19, 19, ... formed on the light source substrate 13A and the light source substrate 13B.

[0114] The board-side connector 15 has electrodes 25, 25, . . . arranged in a row on both the top and bottom sides, with the same number of electrodes arranged side by side. For example, 34 electrodes are arranged side by side on the top side, and 34 electrodes are arranged side by side on the bottom side.

[0115] Similarly, the cable-side connector 17 also has connection terminals 29, 29, . . . provided on both the top and bottom sides, for example, 34 on the top side lined up horizontally and 34 on the bottom side lined up 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 FIGS.

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

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

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

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

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

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

[0123] Furthermore, in lighting device 50, every two adjacent light-emitting elements 14, 14 are connected in series by second wiring portion 20, so that every four light-emitting elements 14, 14, ... are 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] 18, in the first wiring portions 19, 19, ... formed on the upper end portion of the light source substrate 13C, for example, the connection portion 21C8 is electrically connected to the conductor portion 27-11, the connection portion 21C6 is electrically connected to the conductor portion 27-12, the connection portion 21C4 is electrically connected to the conductor portion 27-13, the connection portion 21C2 is electrically connected to the conductor portion 27-14, and the connection portion 21C10 is electrically connected to the conductor portion 27-15. Also, in the first wiring portions 19, 19, ... formed on the lower end portion of the light source substrate 13C, for example, the common connection portions 21C1, 21C3, 21C5, 21C7, and 21C9 are electrically connected to the conductor portions 27-32, 27-33, and 27-34.

[0125] In the first wiring portions 19, 19, ... formed on the upper end portion of the light source substrate 13D, for example, the connection portion 21D8 is electrically connected to the conductor portion 27-16, the connection portion 21D6 is electrically connected to the conductor portion 27-17, the connection portion 21D4 is electrically connected to the conductor portion 27-18, the connection portion 21D2 is electrically connected to the conductor portion 27-19, and the connection portion 21D10 is electrically connected to the conductor portion 27-20. Also, in the first wiring portions 19, 19, ... formed on the lower end portion of the light source substrate 13D, for example, the connection portion 21D7 is electrically connected to the conductor portion 27-11, the connection portion 21D5 is electrically connected to the conductor portion 27-12, the connection portion 21D3 is electrically connected to the conductor portion 27-13, the connection portion 21D1 is electrically connected to the conductor portion 27-14, and the connection portion 21D9 is electrically connected to the conductor portion 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, the light-emitting elements 14C1, 14C2, 14D1, and 14D2 are connected in series, the light-emitting elements 14C3, 14C4, 14D3, and 14D4 are connected in series, the light-emitting elements 14C5, 14C6, 14D5, and 14D6 are connected in series, the light-emitting elements 14C7, 14C8, 14D7, and 14D8 are connected in series, and the light-emitting elements 14C9, 14C10, 14D9, and 14D10 are connected in series.

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

[0128] In the first wiring portions 19, 19, ... formed on the upper end portion of the light source substrate 13F, for example, the connection portion 21F8 is electrically connected to the conductor portion 27-26, the connection portion 21F6 is electrically connected to the conductor portion 27-27, the connection portion 21F4 is electrically connected to the conductor portion 27-28, the connection portion 21F2 is electrically connected to the conductor portion 27-29, and the connection portion 21F10 is electrically connected to the conductor portion 27-30. Also, in the first wiring portions 19, 19, ... formed on the lower end portion of the light source substrate 13F, for example, the connection portion 21F7 is electrically connected to the conductor portion 27-21, the connection portion 21F5 is electrically connected to the conductor portion 27-22, the connection portion 21F3 is electrically connected to the conductor portion 27-23, the connection portion 21F1 is electrically connected to the conductor portion 27-24, and the connection portion 21F9 is electrically connected to the conductor portion 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, the light-emitting elements 14E1, 14E2, 14F1, and 14F2 are connected in series, the light-emitting elements 14E3, 14E4, 14F3, and 14F4 are connected in series, the light-emitting elements 14E5, 14E6, 14F5, and 14F6 are connected in series, the light-emitting elements 14E7, 14E8, 14F7, and 14F8 are connected in series, and the light-emitting elements 14E9, 14E10, 14F9, and 14F10 are connected in series.

[0130] In this way, in the 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, the light-emitting elements 14, 14, ... arranged on the different light source substrates 13, 13 are turned on and off simultaneously, thereby improving the degree of freedom in control of the light-emitting elements 14, 14, ... arranged on the light source substrates 13, 13, ...

[0132] Furthermore, since four adjacent light emitting elements 14, 14, . . . on the top, bottom, left, and right are connected in series, the positions of these four light emitting elements 14, 14, . . . are in a positional relationship that approximates the shape of one pixel.

[0133] Therefore, this is particularly useful when performing local dimming, and it is possible to significantly improve the contrast of the image displayed on the screen and also reduce the power consumption of the illumination device 50.

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

[0135] In addition, in the second example, the wiring patterns 18, 18, ... are different for each light source substrate 13, 13, ..., and at least one of the first wiring portions 19, 19, ... of the light source substrates 13, 13, ... with different wiring patterns 18, 18, ... is connected to a different conductor portion 27, 27, ....

[0136] Therefore, due to differences in wiring patterns 18, the first wiring section 19 is connected to different conductor sections 27, and the conductor sections 27 are connected to the first wiring section 19 and insulated from the wiring section, so it becomes possible to use multiple board-side connectors 15, 15, ... and cable-side connectors 17, 17, ... that 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 portions 27, 27, ... among the plurality of conductor portions 27, 27, ... are electrically connected to the first wiring portion 19, 19, ... of the light source substrate 13 for each light source substrate 13, 13, ... via the cable side connector 17 and the substrate side connector 15.

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

[0139] In this way, in the display device 1 and the lighting device 50, the light source boards 13, 13, ... and the control board 5 are connected by a flexible flat cable 16 that is highly flexible. Therefore, even if the light source boards 13, 13, ... or the control board 5 expand or contract due to temperature changes, causing a misalignment between the two, the misalignment is sufficiently absorbed by the flexible flat cable 16, and a good connection state is ensured at each connection point from the light source boards 13, 13, ... to the control board 5.

[0140] Furthermore, since some of the multiple conductor portions 27, 27, ... of each light source substrate 13, 13, ... are connected to the first wiring portion 19, 19, ..., fewer flexible flat cables 16 are required and the flexible flat cables 16 are thin and inexpensive connection means, which contributes to miniaturization of the display device 1 and the lighting device 50 and reduction in manufacturing costs.

[0141] As a result, in the display device 1 and the lighting device 50, a good connection state between the light source boards 13, 13, . . . and the control board 5 can be ensured without causing a rise in manufacturing costs.

[0142] Furthermore, since multiple light source substrates 13, 13, ... are connected to the control substrate 5 via a flexible flat cable 16, it is possible to control the turning on and off of the light emitting elements 14, 14, ... while miniaturizing the display device 1 and the lighting device 50 and reducing manufacturing costs.

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

[0144] In addition, a plurality of light source substrates 13, 13, ... are arranged spaced apart in a direction perpendicular to the longitudinal direction, a plurality of light emitting elements 14, 14, ... are arranged spaced apart in the longitudinal direction of the light source substrates 13, 13, ..., and a plurality of cable side connectors 17, 17, ... are connected to substrate side connectors 15, 15, ... 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 perpendicular to each other, it is possible to save space for arranging the multiple light source substrates 13, 13, ... and the flexible flat cable 16.

[0146] <Another shape of flexible flat cable> A flexible flat cable 16X, which is an example of a different shape from the flexible flat cable 16, will be described below (see FIG. 20).

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

[0148] The flexible flat cable 16X is formed in a sheet shape and in a stepped shape whose width changes along the length. The flexible flat cable 16X is made up of width varying portions 16a, 16b, ..., 16f whose widths vary depending on the number of light source boards 13, 13, ... to be connected.

[0149] The number of conductor portions 27, 27, ... formed in the width different portions 16a, 16b, ..., 16f is formed according to the size of the left and right width, with the fewest number of conductor portions 27, 27, ... formed in the narrowest width different portion 16a and the greatest number of conductor portions 27, 27, ... formed in the widest width different portion 16f.

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

[0151] In the lighting device 50, as described above, the conductors 27, 27, ... electrically connected to each of the light source boards 13, 13, ... are partially different, and therefore, the fewer the conductors 27, 27, ... located corresponding to the light source boards 13 located farther from the control board 5, the fewer the number of conductors 27, 27, ... required. For example, in the example of Fig. 19 described above, the number of conductors 27 required corresponding to the light source board 13E is eight in total, including five conductors 27-21 to 25 and three conductors 27-32 to 34, and the number of conductors 27 required corresponding to the light source board 13F is thirteen in total, including five conductors 27-21 to 25, five conductors 27-26 to 30, and three conductors 27-32 to 34 connected to the control board 5. Therefore, in this example, five conductors 27, 27, ... located corresponding to the light source boards 13 located farther from the control board 5 are unnecessary.

[0152] Based on this configuration, the flexible flat cable 16X has fewer conductor sections 27, 27, ... in the portions positioned corresponding to the light source boards 13, 13, ... located farther from the control board 5, and therefore the width on the left and right is reduced accordingly.The number of conductor sections 27, 27, ... formed in the width varying section 16a located farthest from the control board 5 is the smallest, and the number of conductor sections 27, 27, ... formed in the width varying section 16f located closest to the control board 5 is the largest.

[0153] Therefore, by using the flexible flat cable 16X, an efficient connection state to the light source boards 13, 13, . . . can be ensured, and the flexible flat cable can be made smaller.

[0154] Furthermore, in the flexible flat cable 16X, some of the conductor portions 27 are electrically connected to the cable-side connectors 17, respectively, and therefore each cable-side connector 17 may be provided with the same number of connection terminals 29 as the number of electrically connected conductor portions 27. In this case, as shown in Fig. 20, by changing the attachment position in the left-right direction of the cable-side connectors 17 for each of the different-width portions 16a, 16b, ..., 16f, it becomes possible to electrically connect the connection terminals 29 regardless of the connection position with the conductor portions 27 for each of the different-width portions 16a, 16b, ..., 16f. 20 shows an example of the connection positions of the conductor portions 27, 27, ... and the connection terminals 29, 29, ... for each of the width varying portions 16a, 16b, ..., 16f as connection positions 29x, 29x, .... Therefore, in this example, the 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 manner, it is possible to use the same cable side connectors 17, 17, by changing the attachment position in the left-right direction of the cable side connectors 17 for each of the different width portions 16a, 16b, ..., 16f. Therefore, it is not necessary to form different cable side connectors 17, 17, ... according to the connection position with the conductor portions 27, 27, ..., and the manufacturing cost of the lighting device 50 can be reduced.

[0156] Incidentally, even when using the flexible flat cable 16X, it is possible to use a cable-side connector 17 (see FIG. 5) provided with connection terminals 29, 29, ... corresponding in number to the total number of conductor portions 27, 27, .... In this case, too, it is possible to use the same cable-side connectors 17, 17, ....

[0157] The flexible flat cable 16X can be used in a state where it is bent in the width direction, and can also be used in a state where it is bent in the thickness direction.

[0158] <Other> Next, the structure of other light source substrates will be described (see Figs. 21 to 25). In the drawings referred to in the structure of other light source substrates shown below, the light source substrates and light emitting elements are shown in simplified form for ease of explanation.

[0159] The light source substrates 30 are attached to the back chassis 4 at intervals on the left and right with their longitudinal directions oriented, for example, vertically (see FIG. 21). On the light source substrate 30, light emitting elements 31 are arranged at equal intervals on the top and bottom.

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

[0161] The fluid spaces 30a, 30a, ... are filled with working liquids 32, 32, ... (see Figure 23). The working liquid 32 has the property of changing from liquid to gas when the temperature rises and reaches a constant temperature, and changing from gas to liquid when the temperature drops and reaches a constant temperature. The working liquid 32 is not filled in the entire fluid space 30a, but rather an amount equivalent to a portion of the volume of the fluid space 30a is filled. Therefore, the working liquid 32 in a liquid state is filled in the lower end portion 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, .... When the temperature of the working fluid 32 increases, the working fluid 32 changes from liquid to gas, and the working fluid 32 that has changed into gas flows upward in the fluid space 30a.

[0163] As the working liquid 32 flows upward in the fluid space 30a, the working liquid 32 cools the light source substrate 30 and the light emitting elements 31, 31, . . .

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

[0165] In addition, since heat is dispersed in the light-emitting elements 31, 31, ..., 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 display device 1 and lighting device 50 to be designed at low cost.

[0166] Furthermore, since the working fluid 32, 32, ... which functions as a coolant for cooling the light-emitting elements 31, 31, ..., etc. is sealed inside the light source substrate 30, there is no need to provide a structure for cooling the light-emitting elements 31, 31, ..., etc. outside the light source substrate 30, and it is possible to reduce the manufacturing costs and size of the display device 1 and the lighting device 50 while improving the driving efficiency and extending the lifespan of the light-emitting elements 31, 31, ....

[0167] Although the above example shows the 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 FIG. 24). In this case, it is desirable that one fluid space 30a is formed in a position corresponding to at least one light emitting element 31.

[0168] In this way, the fluid spaces 30a, 30a, ... are formed separately in the vertical direction, so that the flow length of each of the working fluids 32, 32, ... that are vaporized as the temperature rises is shortened, and therefore the light-emitting elements 31, 31, ... etc. can be cooled quickly and efficiently.

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

[0170] In this case as well, the temperature rises and the flow length of each of the vaporized working fluids 32, 32, . . . becomes shorter, so that the light emitting elements 31, 31, .

[0171] Furthermore, a structure in which the light source substrate 30 is attached to the back chassis 4 in a horizontal state and fluid spaces 30a, 30a, ... extending vertically are formed spaced apart on the left and right can also be applied to the structure of the light source substrate 30 described above.

[0172] <This technology> The present technology can also be configured as follows.

[0173] (1) a plurality of light source substrates each having a wiring pattern formed by a plurality of wiring portions; a plurality of light-emitting elements that are disposed on the light source substrate and whose lighting is controlled by a control substrate; a board-side connector attached to each of the plurality of light source boards; a flexible flat cable having a multi-core structure including a flat insulator and a plurality of conductors arranged in a direction perpendicular to the thickness direction of the insulator, the flexible flat cable having one end connected to the control board; a plurality of cable-side connectors attached to the flexible flat cable and coupled to the board-side connectors; In the wiring section, for each of the plurality of light source boards, some of the plurality of conductor sections are electrically connected via the cable-side connector and the board-side connector. Lighting equipment.

[0174] (2) the plurality of light source substrates are each formed into a shape having a longitudinal direction and are arranged to be spaced apart in a direction perpendicular to the longitudinal direction; the plurality of light emitting elements are arranged at intervals in the longitudinal direction of the light source substrate, The plurality of cable-side connectors are coupled to the board-side connectors attached to the plurality of light source boards, respectively. The lighting device according to (1) above.

[0175] (3) At least two of the light emitting elements arranged on different light source boards are connected in series via the board-side connector, the cable-side connector, and the flexible flat cable. The lighting device according to (1) or (2).

[0176] (4) The cable-side connector is provided with a plurality of connection terminals, a connection hole is formed in the insulator to expose some of the conductor portions among the plurality of conductor portions; Some of the plurality of connection terminals are connected to the conductor portion by being inserted into the connection holes. The lighting device according to any one of (1) to (3).

[0177] (5) the cable-side connector is provided with a plurality of connection terminals connected to the plurality of conductor portions, respectively; The board-side connector is provided with at least one electrode connected to some of the plurality of connection terminals. The lighting device according to any one of (1) to (3).

[0178] (6) the wiring patterns of the plurality of light source substrates are different, At least one of the wiring portions of the light source substrates having different wiring patterns is connected to a different conductor portion. The lighting device according to any one of (1) to (3).

[0179] (7) the flexible flat cable is formed in a stepped shape whose width changes in the longitudinal direction, and has a plurality of width varying portions whose width increases in the longitudinal direction toward the control board, the cable-side connectors are attached to the plurality of different width portions, The number of the conductor portions is increased as the width of the width varying portion is wider. The lighting device according to any one of (1) to (6).

[0180] (8) The cable-side connectors having the same configuration are attached to the plurality of different width portions, respectively. The lighting device according to (7) above.

[0181] (9) a display on which an image is displayed; a back chassis disposed on a side of the display opposite to the display surface; a lighting device that is disposed between the display and the back chassis and functions as a backlight; The lighting device includes: a plurality of light source substrates each having a wiring pattern formed by a plurality of wiring portions; a plurality of light-emitting elements that are disposed on the light source substrate and whose lighting is controlled by a control substrate; a board-side connector attached to each of the plurality of light source boards; a flexible flat cable having a multi-core structure including a flat insulator and a plurality of conductors arranged in a direction perpendicular to the thickness direction of the insulator, the flexible flat cable having one end connected to the control board; a plurality of cable-side connectors attached to the flexible flat cable and coupled to the board-side connectors; In the wiring section, for each of the plurality of light source boards, some of the plurality of conductor sections are electrically connected via the cable-side connector and the board-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...illumination device

Claims

1. Back chassis and 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 boards, each of which has a wiring pattern including a plurality of wiring portions, are arranged on the back chassis, and are divided into groups; a plurality of light-emitting elements each arranged on the light source substrate and controlled by the control substrate; a plurality of flexible flat cables arranged corresponding to a group of a plurality of light source boards, each of which has a multi-core structure including a flat insulator and a plurality of conductor portions arranged in a direction perpendicular to a thickness direction of the insulator, and each of which is connected to the control board; The flexible flat cables are connected to all of the light source boards in the corresponding groups of light source boards. Display device.

2. Each of the light source boards is attached to a corresponding one of the light source boards in the plurality of rows, and a plurality of board-side connectors are provided that are connected to board wiring on the light source board in order to drive the light emitting element. The display device according to claim 1 .

3. A plurality of cable-side connectors are provided, which are connected to the flexible flat cable and the board-side connector, respectively, and supply a driving current for driving the light-emitting element to the board-side connector. The display device according to claim 2 .

4. Some of the conductors are electrically connected to the wiring portion for each of the light source boards via the cable side connector and the board side connector. The display device according to claim 3 .

5. The cable-side connector is provided with a plurality of connection terminals. The display device according to claim 4.

6. the flexible flat cable is provided with a connection hole for exposing a part of the conductor portions among the plurality of conductor portions; Some of the plurality of connection terminals are connected to the conductor portion by being inserted into the connection hole. The display device according to claim 4.

7. The light source boards in the plurality of rows are locally dimmed by the control board. The display device according to claim 1 .

8. The light source boards in the plurality of rows are locally dimmed by the control board, and power consumption is reduced. The display device according to claim 1 .

9. 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 5 .

10. The back chassis has a cable insertion hole through which the flexible flat cable is inserted. The display device according to claim 1 .

11. A diffusion plate and a reflective sheet are provided, the diffuser is disposed between the display and the reflector sheet; The reflective sheet is disposed between the diffusion plate and the back chassis. The display device according to claim 1 .

12. A light-emitting diode is used as the light-emitting element. The display device according to claim 1 .

13. A diffusion plate and support pins are provided. The support pin is disposed on the front side of the back chassis, The diffusion plate is held by the support pins. The display device according to claim 1 .

14. The support pin is made transparent. The display device according to claim 13.

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

16. The connection terminal has a bent tip portion and is connected to the conductor portion. The display device according to claim 9.

17. A circuit configuration is provided that is connected to the control board. The display device according to claim 1 .

18. The display is supplied with current from the control board via the circuit configuration. The display device according to claim 17.

19. The cable-side connector has four walls forming a hollow rectangular structure, and a plurality of connection terminals are provided on the outside of at least two of the four walls. The display device according to claim 5 .

20. Back chassis and 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 boards, each of which has a wiring pattern including a plurality of wires and is disposed on the back chassis; a plurality of light-emitting elements each arranged on the light source substrate and controlled by the control substrate; At least one flexible flat cable having a multi-core structure including a flat insulator and a plurality of conductor portions arranged in a direction perpendicular to a thickness direction of the insulator, the flexible flat cable being connected to the control board and connected to all of the light source boards in the plurality of rows of light source boards. Display device.

Images