Display device

Abstract

To provide a display device capable of effectively saving power.SOLUTION: A display device includes a display panel, a light-emitting-element substrate that is disposed on a back surface side of the display panel and includes a plurality of light emitting elements, and a drive circuit that controls light emission of each of the plurality of light emitting elements. The light emitting element substrate includes a first region in which the plurality of light emitting elements are arranged corresponding to a central region of a predetermined range including a center of the display panel, and a second region in which the plurality of light emitting elements are arranged so as to surround an outer periphery of the first region, and the drive circuit controls a current supplied to each of the light emitting elements such that luminance of the light emitting element arranged in the second region is lower than luminance of the light emitting element arranged in the first region on the light emitting element substrate.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a display device. [Background technology]

[0002] A display device has been proposed that includes an LED backlight unit that is adjusted to have different brightness levels in areas where high brightness is required and areas where high brightness is not required, depending on the brightness distribution required on the light-emitting surface (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-317423 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the LED backlight unit disclosed in Patent Document 1 is divided into multiple areas with different brightness in the horizontal direction of the light-emitting surface, but each area has the same brightness in the vertical direction, so it is not possible to achieve effective power savings.

[0005] An object of the present disclosure is to provide a display device that can achieve effective power saving. [Means for solving the problem]

[0006] A display device according to one embodiment of the present disclosure comprises a display panel, a light-emitting element substrate arranged on the rear side of the display panel and including a plurality of light-emitting elements, and a drive circuit that controls the light emission of each of the plurality of light-emitting elements, wherein the light-emitting element substrate includes a first region in which the plurality of light-emitting elements are arranged corresponding to a central region of a predetermined range including the center of the display panel, and a second region in which the plurality of light-emitting elements are arranged surrounding the periphery of the first region, and the drive circuit controls the current supplied to each of the light-emitting elements so that the light-emitting elements arranged in the second region on the light-emitting element substrate have lower brightness than the light-emitting elements arranged in the first region. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a block diagram illustrating an example of a main configuration of a display device according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is an exploded perspective view showing a schematic configuration of the display device shown in FIG. [Figure 3] 2 is a plan view schematically illustrating an example of an illumination device included in the display device illustrated in FIG. 1. FIG. [Figure 4] 2 is a diagram showing an example of a state in which a display panel included in the display device shown in FIG. 1 is divided into a plurality of regions according to a set brightness. FIG. [Figure 5] 4 is a plan view schematically showing an example of wiring in the lighting device shown in FIG. 3. FIG. [Figure 6] 4 is a diagram illustrating an example of a current setting circuit of an LED driver that drives the lighting device shown in FIG. 3. FIG. [Figure 7] 2 is a diagram showing an example of a state in which a display panel included in the display device shown in FIG. 1 is divided into a plurality of regions according to a set brightness. FIG. [Figure 8] 4 is a plan view schematically showing an example of wiring in the lighting device shown in FIG. 3. FIG. [Figure 9] FIG. 10 is a plan view schematically showing an example of wiring in an illumination device included in a display device according to a first modified example of the first embodiment. [Figure 10]10 is a diagram illustrating an example of a current setting circuit of an LED driver that drives the lighting device shown in FIG. [Figure 11] FIG. 10 is a plan view schematically showing an example of wiring in an illumination device included in a display device according to a first modified example of the first embodiment. [Figure 12] FIG. 10 is a diagram showing an example of a state in which a display panel included in a display device according to a second embodiment is divided into a plurality of regions according to set luminance levels. [Figure 13] FIG. 10 is a plan view schematically showing an example of wiring in an illumination device included in a display device according to a second embodiment. [Figure 14] FIG. 10 is a diagram showing an example of a state in which a display panel included in a display device according to a third embodiment is divided into a plurality of regions according to set luminance levels. [Figure 15] FIG. 11 is a plan view schematically showing an example of wiring in an illumination device included in a display device according to a third embodiment. [Figure 16] FIG. 10 is a plan view schematically showing an example of wiring in an illumination device included in a display device according to a fourth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments and modifications of the present disclosure will be described with reference to the drawings. Note that, hereinafter, identical or corresponding components will be designated by the same reference numerals throughout the drawings, and redundant descriptions thereof will be omitted. Furthermore, the embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and modifications. Various modifications other than these embodiments and modifications are possible depending on the design, etc., as long as they do not deviate from the technical concept of the present disclosure.

[0009] (First embodiment) A display device 1 according to a first embodiment of the present disclosure will be described with reference to Figures 1 to 3. Figure 1 is a perspective view showing a schematic configuration of the display device 1 according to the first embodiment of the present disclosure. Figure 2 is an exploded perspective view showing a schematic configuration of the display device 1 shown in Figure 1. Figure 3 is a plan view schematically showing an example of an illumination device 20 included in the display device 1 shown in Figure 1.

[0010] As shown in Figures 1 and 2, the display device 1 according to an embodiment of the present disclosure has an overall horizontally elongated, approximately rectangular shape, and is configured such that a backlight chassis 15 is provided on the back side of a display panel 11, on which an illumination device 20 (see Figure 3) including a plurality of LEDs 22, such as LED chips, is arranged.

[0011] In the following description, the longitudinal direction of the display device 1 is defined as the left-right direction, the short-side direction of the display device 1 as the up-down direction, and the thickness direction of the display device 1 as the front-to-back direction (see FIGS. 1 and 2). Of the left-to-right directions of the display device 1, the left side when viewed from the front side is defined as the left direction, and the right side is defined as the right direction. Of the front-to-back directions when viewed from the front side, the front side (near side) of the display device 1 is defined as the front direction, and the back side (deep side) is defined as the rear direction. Furthermore, in the display device 1, the bottom side is defined as the downward direction, and the opposite side is defined as the upward direction. However, these directions are defined for the convenience of explanation and do not limit the directions of the display device 1 when in use.

[0012] As shown in FIG. 2, the display device 1 includes a display panel 11, an adhesive layer 12, a frame 13, an optical sheet 14, a diffusion plate 10, and a backlight chassis 15.

[0013] An illumination device 20 is provided on the front side of the backlight chassis 15. As shown in FIG. 3, the illumination device 20 has a plurality of LED bars 21 (light-emitting element substrates, light-emitting element bars) on which a plurality of LEDs 22 (light-emitting elements) are mounted. A connection terminal 23 for connecting to an LED driver 30 is provided at the left end of each LED bar 21. The illumination device 20 is configured to include a plurality of LED bars 21 as light-emitting element substrates, but the light-emitting element substrate may be a single LED substrate. Details of the illumination device 20 will be described later.

[0014] The diffusion plate 10 diffuses the light emitted from the LEDs 22 toward the optical sheet 14. The optical sheet 14 is disposed on the front side of the diffusion plate 10.

[0015] The optical sheet 14 collects the light diffused by the diffusion plate 10 and emits the collected light toward the display panel 11. Although Fig. 2 shows the configuration of the display device 1 including one optical sheet 14, a plurality of optical sheets 14 may be provided.

[0016] In the display device 1, frames 13 are provided on the sides of the side end faces of the backlight chassis 15, the diffusion plate 10, the optical sheets 14, and the display panel 11. The side end faces mentioned above include not only the left and right side portions of each of the backlight chassis 15, the diffusion plate 10, the optical sheets 14, and the display panel 11, but also the top and bottom side portions.

[0017] The display panel 11 is composed of a glass substrate, liquid crystal, etc., and functions as the image display portion of the display device 1. The sides of the display panel 11 are adhered and fixed to the frame 13 via an adhesive layer 12 such as double-sided tape. The frame 13 and the display panel 11 are adhered to each other by bonding dissimilar materials. For this reason, the adhesive layer 12 is thick and elastic to prevent the two from peeling apart due to differences in thermal expansion between the two, etc.

[0018] (Lighting equipment) The configuration of the lighting device 20 will be described with reference to Fig. 4 to Fig. 6 in addition to Fig. 3 described above. Fig. 4 is a diagram showing an example of a state in which the display panel 11 included in the display device 1 shown in Fig. 1 is divided into a plurality of regions according to set brightness. Fig. 5 is a plan view schematically showing an example of wiring in the lighting device 20 shown in Fig. 3. Fig. 6 is a diagram showing an example of a current setting circuit of the LED driver 30 that drives the lighting device 20 shown in Fig. 3.

[0019] In the lighting device 20, a plurality of LED bars 21 are fixed by mounting members (screws, adhesive tape, etc.) not shown. The LED bars 21 extend in the left-right direction (first direction) of the display panel 11 and are arranged in parallel in the up-down direction (second direction) of the display panel. On the LED bar 21, a plurality of LEDs 22 are arranged at equal intervals along the extension direction of the LED bar 21.

[0020] Therefore, in the lighting device 20, the plurality of LEDs 22 are arranged at predetermined intervals in the row and column directions as a whole. The arrangement intervals of the plurality of LED bars 21 and the arrangement intervals of the plurality of LEDs 22 in each LED bar 21 are not particularly limited and are determined appropriately based on the size and display performance of the display panel 11, the performance (brightness) of the LEDs 22, etc. Furthermore, the plurality of LEDs 22 are arranged so that their light emitting surfaces are substantially parallel to the display surface of the display panel 11, and so that the optical axes (central axes) of the light emitted from the plurality of LEDs 22 are substantially perpendicular to the display surface of the display panel 11.

[0021] The display device 1 includes an LED driver 30 that controls the light emission of each of the plurality of LEDs 22, and each LED bar 21 is connected to the LED driver 30 via a connection terminal .

[0022] 4, in the display device 1, the light emission of the LEDs 22 is controlled so that the brightness of the peripheral region 11B surrounding the periphery of the central region 11A of the display panel 11 is lower than the brightness of the central region 11A. In the LED bar 21, the region where the plurality of LEDs 22 are arranged corresponding to the central region 11A is referred to as a first region 50 (see FIG. 3), and the region where the plurality of LEDs 22 are arranged corresponding to the peripheral region 11B is referred to as a second region 51 (see FIG. 3).

[0023] The central region 11A is a rectangular region of a predetermined range that includes the center of the display panel 11, and the range of the region can be set appropriately depending on the display characteristics of the display panel 11 and the like.

[0024] In the display device 1 according to the first embodiment, the peripheral region 11B is further divided into 14 regions, 11B1 to 11B14, and brightness is set for each region. That is, the peripheral region 11B above the upper edge of the central region 11A of the display panel 11 is divided horizontally into five regions (peripheral regions 11B1 to 11B5), the region to the left of the left edge of the central region 11A is divided into two regions (peripheral regions 11B6 and 11B7), and the region to the right of the right edge of the central region 11A is divided into two regions (peripheral regions 11B8 and 11B9). In addition, the region below the bottom edge of the central region 11A is divided into five regions (peripheral regions 11B10 to 11B14).

[0025] The light emission of the plurality of LEDs 22 arranged corresponding to each region is controlled so that the luminance of each region satisfies the relationship: central region 11A > (peripheral region 11B7 = peripheral region 11B8) > (peripheral region 11B3 = peripheral region 11B6 = peripheral region 11B9 = peripheral region 11B12) > (peripheral region 11B2 = peripheral region 11B4 = peripheral region 11B11 = peripheral region 11B13) > (peripheral region 11B1 = peripheral region 11B5 = peripheral region 11B10 = peripheral region 11B14). The light emission of the LEDs 22 can be controlled by controlling the current supplied to each LED 22. The current values ​​shown in parentheses for each region in FIG. 4 indicate the values ​​of the current supplied to the LEDs 22 arranged corresponding to each region.

[0026] In order to control the current supplied to the LEDs 22 and set the brightness relationship between the central region 11A and the multiple peripheral regions 11B of the display panel 11 as described above, this can be achieved by wiring multiple LEDs 22 in each LED bar 21 as shown in Figure 5.

[0027] 5, in the display device 1 according to the first embodiment, a first LED bar 21a, a second LED bar 21b, a third LED bar 21c, and a fourth LED bar 21d extending in the left-right direction are arranged parallel to one another from top to bottom of the lighting device 20. When there is no need to particularly distinguish between the first LED bar 21a to the fourth LED bar 21d, they may be simply referred to as LED bars 21.

[0028] Each LED bar 21 is equipped with 12 LEDs 22. That is, in the first LED bar 21a, LEDs 22a1 to LED22a12 are arranged from the left end to the right end of the first LED bar 21a.

[0029] Of these, LED22a1 and LED22a2 are provided in the second region 51 corresponding to the peripheral region 11B1 of the display panel 11. LED22a3 and LED22a4 are provided in the second region 51 corresponding to the peripheral region 11B2 of the display panel 11. LED22a5 to LED22a8 are provided in a region (second region) corresponding to the peripheral region 11B3 of the display panel 11. LED22a9 and LED22a10 are provided in the second region 51 corresponding to the peripheral region 11B4 of the display panel 11. LED22a11 and LED22a12 are provided in the second region 51 corresponding to the peripheral region 11B5 of the display panel 11.

[0030] Outer peripheral region 11B1 and outer peripheral region 11B5 have the same brightness. Therefore, LEDs 22a1 and 22a2, and LEDs 22a11 and 22a12, which are arranged corresponding to these outer peripheral regions 11B, are connected in series between anode A6 and cathode C6 of connection terminal 23, and a current input from LED driver 30 via anode A6 is output from cathode C6. In this embodiment, the current supplied to LEDs 22a1, LED 22a2, LED 22a11, and LED 22a12 can be set to 70 mA.

[0031] Next, outer peripheral region 11B2 and outer peripheral region 11B4 have the same brightness. Therefore, LEDs 22a3 and 22a4, and LEDs 22a9 and 22a10 arranged corresponding to these outer peripheral regions 11B are connected in series between anode A5 and cathode C5 of connection terminal 23, and current input from LED driver 30 via anode A5 is output from cathode C5. In this embodiment, the current supplied to LEDs 22a3, LED 22a4, LED 22a9, and LED 22a10 can be set to 75 mA.

[0032] Furthermore, LEDs 22a5 to LEDs 22a8 arranged corresponding to outer peripheral region 11B3 are connected in series between anode A4 and cathode C4 of connection terminal 23, and a current input from LED driver 30 via anode A4 is output from cathode C4. In this embodiment, the current supplied to LEDs 22a5 to LEDs 22a8 can be set to 80 mA.

[0033] As described above, by wiring each LED 22 in the first LED bar 21a and adjusting the current supplied to each LED 22, the first LED bar 21a can be configured so that the outer peripheral region 11B3, which is close to the central region 11A of the display panel 11, is the region with the highest brightness, and the brightness decreases as the region approaches the periphery of the display panel 11.

[0034] Next, in the second LED bar 21b, LEDs 22b1 to 22b12 are arranged from the left end to the right end of the second LED bar 21b.

[0035] Of these, LED22b1 and LED22b2 are provided in the second region 51 corresponding to the peripheral region 11B6 of the display panel 11. LED22b3 and LED22b4 are provided in the second region 51 corresponding to the peripheral region 11B7 of the display panel 11. LED22b5 to LED22b8 are provided in the first region 50 corresponding to the central region 11A of the display panel 11. LED22b9 and LED22b10 are provided in the second region 51 corresponding to the peripheral region 11B8 of the display panel 11. LED22b11 and LED22b12 are provided in the second region 51 corresponding to the peripheral region 11B9 of the display panel 11.

[0036] Outer peripheral region 11B6 and outer peripheral region 11B9 have the same brightness. Therefore, LEDs 22b1 and 22b2, and LEDs 22b11 and 22b12, which are arranged corresponding to these outer peripheral regions 11B, are connected in series between anode A3 and cathode C3 of connection terminal 23, and a current input from LED driver 30 via anode A3 is output from cathode C3. In this embodiment, the current supplied to LEDs 22b1, LED 22b2, LED 22b11, and LED 22b12 can be 80 mA.

[0037] Next, peripheral region 11B7 and peripheral region 11B8 have the same brightness. Therefore, LEDs 22b3 and 22b4, and LEDs 22b9 and 22b10 arranged corresponding to these peripheral regions 11B are connected in series between anode A2 and cathode C2 of connection terminal 23, and a current input from LED driver 30 via anode A2 is output from cathode C2. In this embodiment, the current supplied to LEDs 22b3, LED 22b4, LED 22b9, and LED 22b10 can be set to 90 mA.

[0038] Furthermore, LEDs 22b5 to LED 22b8 arranged corresponding to the central region 11A are connected in series between the anode A1 and cathode C1 of the connection terminal 23, and a current input from the LED driver 30 via the anode A1 is output from the cathode C1. In this embodiment, the current supplied to LEDs 22b5 to LED 22b8 can be set to 100 mA.

[0039] That is, when the display panel 11 is to be displayed at 100% brightness, a current of 100 mA is supplied. When the brightness of the display panel 11 is to be reduced, the current supplied to the LEDs 22 is set to a value lower than 100 mA. The brightness of the display panel 11 can be set by the current supplied to the LEDs 22.

[0040] As described above, by wiring each LED 22 in the second LED bar 21b and adjusting the current supplied to each LED 22, the second LED bar 21b can be configured so that the central region 11A of the display panel 11 is the brightest region, and the brightness decreases as the region approaches the periphery of the display panel 11.

[0041] Next, in the third LED bar 21c, LEDs 22c1 to LED22c12 are arranged from the left end to the right end of the third LED bar 21c.

[0042] Of these, LED22c1 and LED22c2 are provided in the second region 51 corresponding to the peripheral region 11B6 of the display panel 11. LED22c3 and LED22c4 are provided in the second region 51 corresponding to the peripheral region 11B7 of the display panel 11. LED22c5 to LED22c8 are provided in the first region 50 corresponding to the central region 11A of the display panel 11. LED22c9 and LED22c10 are provided in the second region 51 corresponding to the peripheral region 11B8 of the display panel 11. LED22c11 and LED22c12 are provided in the second region 51 corresponding to the peripheral region 11B9 of the display panel 11.

[0043] Outer peripheral region 11B6 and outer peripheral region 11B9 have the same luminance. Therefore, LEDs 22c1 and 22c2, and LEDs 22c11 and 22c12, which are arranged corresponding to these outer peripheral regions 11B, are connected in series between anode A3 and cathode C3 of connection terminal 23, and a current input from LED driver 30 via anode A3 is output from cathode C3. In this embodiment, the current supplied to LEDs 22c1, LED 22c2, LED 22c11, and LED 22c12 can be 80 mA.

[0044] Next, peripheral region 11B7 and peripheral region 11B8 have the same brightness. Therefore, LED22c3 and LED22c4, and LED22c9 and LED22c10 arranged corresponding to these peripheral regions 11B are connected in series between anode A2 and cathode C2 of connection terminal 23, and current input from LED driver 30 via anode A2 is output from cathode C2. In this embodiment, the current supplied to LED22c3, LED22c4, LED22c9, and LED22c10 can be 90 mA.

[0045] Furthermore, LEDs 22c5 to LED22c8 arranged corresponding to central region 11A are connected in series between anode A1 and cathode C1 of connection terminal 23, and a current input from LED driver 30 via anode A1 is output from cathode C1. In this embodiment, the current supplied to LEDs 22c5 to LED22c8 can be set to 100 mA.

[0046] As described above, by wiring each LED 22 in the third LED bar 21c and adjusting the current supplied to each LED 22, the third LED bar 21c can be configured so that the central region 11A of the display panel 11 is the brightest region, and the brightness decreases as the region approaches the periphery of the display panel 11.

[0047] Next, in the fourth LED bar 21d, LEDs 22d1 to LED 22d12 are arranged from the left end to the right end of the fourth LED bar 21d.

[0048] Of these, LED22d1 and LED22d2 are provided in the second region 51 corresponding to the outer circumferential region 11B10 of the display panel 11. LED22d3 and LED22d4 are provided in the second region 51 corresponding to the outer circumferential region 11B11 of the display panel 11. LED22d5 to LED22d8 are provided in the second region 51 corresponding to the outer circumferential region 11B12 of the display panel 11. LED22d9 and LED22d10 are provided in the second region 51 corresponding to the outer circumferential region 11B13 of the display panel 11. LED22d11 and LED22d12 are provided in the second region 51 corresponding to the outer circumferential region 11B14 of the display panel 11.

[0049] Next, the luminance of the outer peripheral region 11B10 and the luminance of the outer peripheral region 11B14 are the same. Therefore, the LEDs 22d1 and 22d2, and the LEDs 22d11 and 22d12 arranged corresponding to the outer peripheral region 11B are connected in series between the anode A6 and the cathode C6 of the connection terminal 23, and the current input from the LED driver 30 via the anode A6 is output from the cathode C6. In this embodiment, the current supplied to the LEDs 22d1, 22d2, 22d11, and 22d12 can be set to 70 mA.

[0050] Next, outer peripheral region 11B11 and outer peripheral region 11B13 have the same brightness. Therefore, LED22d3 and LED22d4, and LED22d9 and LED22d10 arranged corresponding to these outer peripheral regions 11B are connected in series between anode A5 and cathode C5 of connection terminal 23, and current input from LED driver 30 via anode A5 is output from cathode C5. In this embodiment, the current supplied to LED22d3, LED22d4, LED22d9, and LED22d10 can be set to 75 mA.

[0051] Furthermore, LEDs 22d5 to LED 22d8 arranged corresponding to outer circumferential region 11B12 are connected in series between anode A4 and cathode C4 of connection terminal 23, and a current input from LED driver 30 via anode A4 is output from cathode C4. In this embodiment, the current supplied to LEDs 22d5 to LED 22d8 can be set to 80 mA.

[0052] As described above, by wiring each LED 22 in the fourth LED bar 21d and adjusting the current supplied to each LED 22, the fourth LED bar 21d can be configured so that the outer peripheral region 11B12, which is close to the central region 11A of the display panel 11, is the brightest region, and the brightness decreases as the region approaches the periphery of the display panel 11.

[0053] Moreover, the currents supplied to the LEDs 22 arranged corresponding to the central region 11A and the peripheral regions 11B1 to 11B14 of the display panel 11 can be set by an LED driver 30 shown in FIG.

[0054] As shown in FIG. 6, in the LED driver 30, a switching element Q1 is provided in a circuit connected to the cathode C1 of the connection terminal 23 of each of the second LED bar 21b and the third LED bar 21c.

[0055] The switching element Q1 controls the ON / OFF of the current and may be, for example, a PNP bipolar transistor. A resistor R1 is provided between the collector of the switching element Q1 and ground, and an LED current setting circuit 31a is connected to the base of the switching element Q1.

[0056] One terminal of the LED current setting circuit 31a is connected to the base of the switching element Q1, and the other terminal is connected between the switching element Q1 and the resistor R1. The LED current setting circuit 31a senses the current value from the resistance value of the resistor R1 and sets the current to be supplied from the anode A1 to each of the second LED bar 21b and the third LED bar 21c.

[0057] Similarly, the circuit connected to the cathode C2 of the connection terminal 23 of each of the second LED bar 21b and the third LED bar 21c includes a switching element Q2, an LED current setting circuit 31b, and a resistor R2, and the LED current setting circuit 31b senses the current value from the resistance value of the resistor R2 and sets the current to be supplied from the anode A2 to each of the second LED bar 21b and the third LED bar 21c.

[0058] Similarly, a switching element Q3, an LED current setting circuit 31c, and a resistor R3 are provided in the circuit connected to the cathode C3 of the connection terminal 23 of each of the second LED bar 21b and the third LED bar 21c, and the LED current setting circuit 31c senses the current value from the resistance value of the resistor R3 and sets the current to be supplied from the anode A3 to each of the second LED bar 21b and the third LED bar 21c.

[0059] 6, the cathodes (cathodes C1 to C3) of the second LED bar 21b and the cathodes (cathodes C1 to C3) of the third LED bar 21c, to which the same current is supplied, are connected in parallel within the LED driver 30, and do not need to be connected in parallel on the lighting device 20 side. That is, in the lighting device 20, wiring or the like for connecting the second LED bar 21b and the third LED bar 21c is not required.

[0060] In addition, LED bars 21 supplied with the same current (the second LED bar 21b and the third LED bar 21c, or the first LED bar 21a and the fourth LED bar 21d) refer to LED bars 21 in which the combination of currents supplied to each LED 22 in each LED bar 21 forms the same pattern.

[0061] In addition, a switching element Q4, an LED current setting circuit 31d, and a resistor R4 are provided in the circuit connected to the cathode C4 of the connection terminal 23 of each of the first LED bar 21a and the fourth LED bar 21d, and the LED current setting circuit 31d senses the current value from the resistance value of the resistor R4 and sets the current to be supplied from the anode A4 to each of the first LED bar 21a and the fourth LED bar 21d.

[0062] Similarly, a switching element Q5, an LED current setting circuit 31e, and a resistor R5 are provided in the circuit connected to the cathode C5 of the connection terminal 23 of each of the first LED bar 21a and the fourth LED bar 21d, and the LED current setting circuit 31e senses the current value from the resistance value of the resistor R5 and sets the current to be supplied from the anode A5 to each of the first LED bar 21a and the fourth LED bar 21d.

[0063] Similarly, a switching element Q6, an LED current setting circuit 31f, and a resistor R6 are provided in the circuit connected to the cathode C6 of the connection terminal 23 of each of the first LED bar 21a and the fourth LED bar 21d, and the LED current setting circuit 31f senses the current value from the resistance value of the resistor R6 and determines the current to be supplied from the anode A6 to each of the first LED bar 21a and the fourth LED bar 21d.

[0064] The cathodes (cathodes C4 to C6) of the first LED bar 21a and the cathodes (cathodes C4 to C6) of the fourth LED bar 21d, to which the same current is supplied, are connected in parallel within the LED driver 30 as shown in FIG. 6, and do not need to be connected in parallel on the lighting device 20 side.

[0065] As described above, in the display device 1 of the first embodiment, the current supplied to each of the peripheral regions 11B (peripheral regions 11B1 to 11B5, 11B10 to 11B14) located on the periphery of the central region 11A in the vertical direction of the central region 11A, and the peripheral regions 11B (11B6 to 11B9) located on the periphery of the central region 11A in the horizontal direction of the central region 11A, can be adjusted so as to lower the brightness compared to the central region 11A.

[0066] Therefore, the display device 1 according to the first embodiment can reduce the luminance of only the peripheral region 11B of the display panel 11 without reducing the luminance of the central region 11A. Here, the central region 11A is an area that viewers frequently view. Therefore, by reducing the luminance of the peripheral region 11B without reducing the luminance of the central region 11A, it is possible to prevent the image displayed on the display panel 11 from appearing too dark to the user and reduce power consumption.

[0067] Furthermore, the display device 1 of the first embodiment can reduce the brightness of the LEDs 22 corresponding to the peripheral region 11B more than the brightness of the LEDs 22 corresponding to the central region 11A of the display panel with a simple configuration without changing the specifications regarding the arrangement of the LED bars 21 arranged in parallel in the vertical direction of the display panel 11.

[0068] In addition, since sets of LED bars 21 to which the same current is supplied to LEDs 22 are connected in parallel within the LED driver 30, there is no need for wiring or the like to connect LED bars 21 to which the same current is supplied to LEDs 22 in the lighting device 20.

[0069] In the display device 1 according to the first embodiment, the display panel 11 is divided into 15 areas, and brightness is set for each divided area, but the number of areas for which brightness is set is not limited to 15.

[0070] For example, as shown in Fig. 7, the display panel 11 may be divided into nine regions, including a central region 11A and peripheral regions 11B1a to 11B8a. As shown in Fig. 7, even if the number of regions for which brightness is set is changed in the display panel 11, this can be easily accommodated by simply changing the wiring as shown in Fig. 8. Fig. 7 is a diagram showing an example of a state in which the display panel 11 included in the display device 1 shown in Fig. 1 is divided into a plurality of regions according to the set brightness. Fig. 8 is a plan view schematically showing an example of wiring in the lighting device 20 shown in Fig. 3.

[0071] 7, the display panel 11 is divided into a central region 11A and multiple peripheral regions 11B surrounding the periphery of the central region 11A. The peripheral region 11B is divided into eight regions, 11B1a-11B8a, and brightness is set for each region. That is, the peripheral region 11B above the top edge of the central region 11A of the display panel 11 is divided into three regions (peripheral regions 11B1a-11B3a) in the left-right direction, the region to the left of the left edge of the central region 11A is divided into one region (peripheral region 11B4a), and the region to the right of the right edge of the central region 11A is divided into one region (peripheral region 11B5a). In addition, the region below the bottom edge of the central region 11A is divided into three regions (peripheral regions 11B6a-11B8a).

[0072] In the first LED bar 21a, LEDs 22a1 to 22a3 are provided in an area corresponding to the outer peripheral area 11B1a of the display panel 11. LEDs 22a4 to 22a9 are provided in an area corresponding to the outer peripheral area 11B2a of the display panel 11. LEDs 22a10 to 22a12 are provided in an area corresponding to the outer peripheral area 11B3a of the display panel 11.

[0073] Since peripheral region 11B1a and peripheral region 11B3a have the same brightness, LEDs 22a1 to 22a3 and LEDs 22a10 to 22a12 arranged corresponding to these regions are connected in series between anode A4 and cathode C4 of connection terminal 23, and current input from LED driver 30 via anode A4 is output from cathode C4. In this embodiment, the current supplied to LEDs 22a1 to 22a3 and LEDs 22a10 to 22a12 can be 80 mA.

[0074] Furthermore, LEDs 22a4 to LED 22a9 arranged corresponding to outer peripheral region 11B2a are connected in series between anode A3 and cathode C3 of connection terminal 23, and current input from LED driver 30 via anode A3 is output from cathode C3. In this embodiment, the current supplied to LEDs 22a4 to LED 22a9 can be set to 90 mA.

[0075] In the second LED bar 21b, LEDs 22b1 to 22b3 are provided in a region corresponding to the outer peripheral region 11B4a of the display panel 11. LEDs 22b4 to 22b9 are provided in a region corresponding to the central region 11A of the display panel 11. LEDs 22b10 to 22b12 are provided in a region corresponding to the outer peripheral region 11B5a of the display panel 11.

[0076] Since peripheral region 11B4a and peripheral region 11B5a have the same brightness, LEDs 22b1 to 22b3 and LEDs 22b10 to 22b12 arranged corresponding to these regions are connected in series between anode A2 and cathode C2 of connection terminal 23, and current input from LED driver 30 via anode A2 is output from cathode C2. In this embodiment, the current supplied to LEDs 22b1 to 22b3 and LEDs 22b10 to 22b12 can be set to 90 mA.

[0077] Furthermore, LEDs 22b4 to LED 22b9 arranged corresponding to the central region 11A are connected in series between the anode A1 and cathode C1 of the connection terminal 23, and a current input from the LED driver 30 via the anode A1 is output from the cathode C1. In this embodiment, the current supplied to LEDs 22b4 to LED 22b9 can be set to 100 mA.

[0078] In the third LED bar 21c, LEDs 22c1 to 22c3 are provided in a region corresponding to the outer peripheral region 11B4a of the display panel 11. LEDs 22c4 to 22c9 are provided in a region corresponding to the central region 11A of the display panel 11. LEDs 22c10 to 22c12 are provided in a region corresponding to the outer peripheral region 11B5a of the display panel 11.

[0079] Since peripheral region 11B4a and peripheral region 11B5a have the same luminance, LEDs 22c1 to 22c3 and LEDs 22c10 to 22c12 arranged corresponding to these regions are connected in series between anode A2 and cathode C2 of connection terminal 23, and current input from LED driver 30 via anode A2 is output from cathode C2. In this embodiment, the current supplied to LEDs 22c1 to 22c3 and LEDs 22c10 to 22c12 can be set to 90 mA.

[0080] Furthermore, LEDs 22c4 to LED 22c9 arranged corresponding to central region 11A are connected in series between anode A1 and cathode C1 of connection terminal 23, and current input from LED driver 30 via anode A1 is output from cathode C1. In this embodiment, the current supplied to LEDs 22c4 to LED 22c9 can be set to 100 mA.

[0081] In the fourth LED bar 21d, LEDs 22d1 to 22d3 are provided in a region corresponding to the outer peripheral region 11B6a of the display panel 11. LEDs 22d4 to 22d9 are provided in a region corresponding to the outer peripheral region 11B7a of the display panel 11. LEDs 22d10 to 22d12 are provided in a region corresponding to the outer peripheral region 11B8a of the display panel 11.

[0082] Since peripheral region 11B6a and peripheral region 11B8a have the same brightness, LEDs 22d1 to 22d3 and LEDs 22d10 to 22d12 arranged corresponding to these regions are connected in series between anode A4 and cathode C4 of connection terminal 23, and current input from LED driver 30 via anode A4 is output from cathode C4. In this embodiment, the current supplied to LEDs 22d1 to 22d3 and LEDs 22d10 to 22d12 can be 80 mA.

[0083] Furthermore, LEDs 22d4 to LED 22d9 arranged corresponding to outer circumferential region 11B7a are connected in series between anode A3 and cathode C3 of connection terminal 23, and current input from LED driver 30 via anode A3 is output from cathode C3. In this embodiment, the current supplied to LEDs 22d4 to LED 22d9 can be set to 90 mA.

[0084] (First Modification) Next, a display device 1 according to a first modification of the first embodiment will be described with reference to Fig. 9 and Fig. 10. Fig. 9 is a plan view schematically showing an example of wiring in an illumination device 20 included in the display device 1 according to the first modification of the first embodiment. Fig. 10 is a diagram showing an example of a current setting circuit of an LED driver 30 that drives the illumination device 20 shown in Fig. 9.

[0085] 9, the display device 1 according to the first modification of the first embodiment differs from the display device 1 according to the first embodiment in the wiring that connects the plurality of LEDs 22 in the LED bar 21. In all other respects, the display device 1 according to the first embodiment and the display device 1 according to the first modification of the first embodiment are similar, and therefore similar components are given the same reference numerals and their description will be omitted. Furthermore, the display device 1 according to the first modification of the first embodiment has the same regions divided into the display panel 11 and the same number of divided regions as the display device 1 according to the first embodiment.

[0086] In the display device 1 according to the first variant of the first embodiment, a set of LED bars 21 among the first LED bar 21a to the fourth LED bar 21d, in which the same current is supplied to the LEDs 21, is connected in series with the LED driver 30 so that a smaller current is supplied to the LEDs 22 arranged in the second region 51 corresponding to the peripheral region 11B than to the LEDs 22 arranged in the first region 50 corresponding to the central region 11A.

[0087] Specifically, the first LED bar 21a and the fourth LED bar 21d are connected in series to the LED driver 30. In addition, the second LED bar 21b and the third LED bar 21c are connected in series to the LED driver 30.

[0088] That is, LEDs 22a1, 22a2, 22a11, and 22a12 mounted on the first LED bar 21a, which are arranged corresponding to the outer peripheral regions 11B1, 11B5, 11B10, and 11B14 having the same brightness, and LEDs 22d1, 22d2, 22d11, and 22d12 mounted on the fourth LED bar 21d are connected in series to the LED driver 30. A current of 70 mA is supplied from the LED driver 30 via the anode A6 of the connection terminal 23 of the first LED bar 21a, and the current flows through the first LED bar 21a in the order of LEDs 22a1, 22a2, 22a11, and 22a12, and then toward the fourth LED bar 21d. In the fourth LED bar 21d, a current flows through the LED 22d12, the LED 22d11, the LED 22d2, and the LED 22d1 in this order, and is output to the LED driver 30 via the cathode C6 of the connection terminal 23 of the fourth LED bar 21d.

[0089] Additionally, LEDs 22a3, 22a4, 22a9, and 22a10 mounted on the first LED bar 21a, which are arranged corresponding to outer circumferential regions 11B2, 11B4, 11B11, and 11B13 having the same brightness, and LEDs 22d3, 22d4, 22d9, and 22d10 mounted on the fourth LED bar 21d are connected in series to the LED driver 30. A current of 75 mA is supplied from the LED driver 30 via the anode A5 of the connection terminal 23 of the first LED bar 21a, and the current flows through LEDs 22a3, 22a4, 22a9, and 22a10 in the first LED bar 21a in this order, and then toward the fourth LED bar 21d. In the fourth LED bar 21d, a current flows through the LED 22d10, the LED 22d9, the LED 22d4, and the LED 22d3 in this order, and is output to the LED driver 30 via the cathode C5 of the connection terminal 23 of the fourth LED bar 21d.

[0090] Additionally, LEDs 22a5, 22a6, 22a7, and 22a8 mounted on the first LED bar 21a and LEDs 22d5, 22d6, 22d7, and 22d8 mounted on the fourth LED bar 21d, which are arranged corresponding to the peripheral regions 11B3 and 11B12 and have the same brightness, are connected in series to the LED driver 30. An 80 mA current is supplied from the LED driver 30 via the anode A4 of the connection terminal 23 of the first LED bar 21a. The current flows through LEDs 22a5, 22a6, 22a7, and 22a8 in the first LED bar 21a in this order, and then toward the fourth LED bar 21d. In the fourth LED bar 21d, the current flows through LEDs 22d8, 22d7, 22d6, and 22d5 in this order, and is output to the LED driver 30 via the cathode C4 of the connection terminal 23 of the fourth LED bar 21d.

[0091] As described above, the second LED bar 21b and the third LED bar 21c are also connected in series to the LED driver 30.

[0092] That is, LEDs 22b1, 22b2, 22b11, and 22b12 mounted on second LED bar 21b, which are arranged corresponding to outer circumferential regions 11B6 and 11B9 having the same brightness, and LEDs 22c1, 22c2, 22c11, and 22c12 mounted on third LED bar 21c are connected in series to LED driver 30. A current of 80 mA is supplied from LED driver 30 via anode A3 of connection terminal 23 of second LED bar 21b, and the current flows through LEDs 22b1, 22b2, 22b11, and 22b12 in the second LED bar 21b in this order, and then toward third LED bar 21c. In the third LED bar 21c, a current flows through the LED22c12, the LED22c11, the LED22c2, and the LED22c1 in this order, and is output to the LED driver 30 via the cathode C3 of the connection terminal 23 of the third LED bar 21c.

[0093] Additionally, LEDs 22b3, LED 22b4, LED 22b9, and LED 22b10 mounted on second LED bar 21b, which are arranged corresponding to outer circumferential regions 11B7 and 11B8 that have the same brightness, and LEDs 22c3, LED 22c4, LED 22c9, and LED 22c10 mounted on third LED bar 21c are connected in series to LED driver 30. A current of 90 mA is supplied from LED driver 30 via anode A2 of connection terminal 23 of second LED bar 21b, and the current flows in the order of LEDs 22b3, LED 22b4, LED 22b9, and LED 22b10 in second LED bar 21b, and then toward third LED bar 21c. In the third LED bar 21c, a current flows through the LED 22c10, the LED 22c9, the LED 22c4, and the LED 22c3 in this order, and is output to the LED driver 30 via the cathode C2 of the connection terminal 23 of the third LED bar 21c.

[0094] Additionally, LEDs 22b5, 22b6, 22b7, and 22b8 mounted on the second LED bar 21b, which are arranged corresponding to the central region 11A, and LEDs 22c5, 22c6, 22c7, and 22c8 mounted on the third LED bar 21c, are connected in series to the LED driver 30. A current of 100 mA is supplied from the LED driver 30 via the anode A1 of the connection terminal 23 of the second LED bar 21b. The current flows through LEDs 22b5, 22b6, 22b7, and 22b8 in the second LED bar 21b in this order, and then toward the third LED bar 21c. In the third LED bar 21c, the current flows through LEDs 22c8, 22c7, 22c6, and 22c5 in this order, and is output to the LED driver 30 via the cathode C1 of the connection terminal 23 of the third LED bar 21c.

[0095] Furthermore, in the display device 1 according to the first variant of the first embodiment, the currents supplied to the LEDs 22 corresponding to the central region 11A and the peripheral regions 11B1 to 11B14 of the display panel 11 can be set by the LED current setting circuits 31a to 31f included in the LED driver 30, respectively, as shown in FIG. 10.

[0096] The LED driver 30 according to the first modification of the first embodiment differs from the LED driver 30 according to the first embodiment in that the number of anode terminals and the number of cathode terminals are half and there is no need to connect the same anode terminals in parallel. The other points are the same and therefore will not be described.

[0097] In the display device 1 according to the first modification of the first embodiment, a set of LED bars 21 in which the same current is supplied to the LEDs 22 are connected in series to the LED driver 30, so there is no need to provide wiring for each LED bar 21 to return current from each LED bar 21 to the LED driver 30. This allows the distance between adjacent LED bars 21 in the lighting device 20 to be reduced, thereby enabling the lighting device 20 to be made smaller.

[0098] In the display device 1 according to the first variant of the first embodiment, the display panel 11 is divided into 15 areas and the brightness is set for each divided area, but the number of areas for which the brightness is set is not limited to 15.

[0099] For example, as shown in Fig. 7, the display panel 11 may be divided into nine regions, namely, a central region 11A and peripheral regions 11B1a to 11B8a. As shown in Fig. 7, even if the number of regions for which brightness is set is changed in the display panel 11, this can be easily accommodated by simply changing the wiring as shown in Fig. 11. Fig. 11 is a plan view schematically showing an example of wiring in an illumination device 20 included in a display device 1 according to a first modified example of the first embodiment.

[0100] Specifically, the first LED bar 21a and the fourth LED bar 21d are connected in series to the LED driver 30. In addition, the second LED bar 21b and the third LED bar 21c are connected in series to the LED driver 30.

[0101] In other words, in the first LED bar 21a, LEDs 22a1 to 22a3, LEDs 22a10 to 22a12 mounted on the first LED bar 21a, and LEDs 22d1 to 22d3, LEDs 22d10 to 22d12 mounted on the fourth LED bar 21d, which are arranged corresponding to the peripheral areas 11B1a, 11B3a, 11B6a, and 11B8a that have the same brightness, are connected in series with the LED driver 30.

[0102] A current of 80 mA is supplied from the LED driver 30 via the anode A4 of the connection terminal 23 of the first LED bar 21a, and the current flows through LED22a1, LED22a2, LED22a3, LED22a10, LED22a11, and LED22a12 in the first LED bar 21a in this order, and then toward the fourth LED bar 21d. In the fourth LED bar 21d, the current flows through LED22d12, LED22d11, LED22d10, LED22d3, LED22d2, and LED22d1 in this order, and is output to the LED driver 30 via the cathode C4 of the connection terminal 23 of the fourth LED bar 21d.

[0103] In addition, LEDs 22a4, LED 22a5, LED 22a6, LED 22a7, LED 22a8, and LED 22a9 mounted on the first LED bar 21a, which are arranged corresponding to the peripheral areas 11B2a, 11B7a having the same brightness, and LEDs 22d4, LED 22d5, LED 22d6, LED 22d7, LED 22d8, and LED 22d9 mounted on the fourth LED bar 21d are connected in series to the LED driver 30.

[0104] A current of 90 mA is supplied from the LED driver 30 via the anode A3 of the connection terminal 23 of the first LED bar 21a, and the current flows through LED22a4, LED22a5, LED22a6, LED22a7, LED22a8, and LED22a9 in the first LED bar 21a in this order, and then toward the fourth LED bar 21d. In the fourth LED bar 21d, the current flows through LED22d9, LED22d8, LED22d7, LED22d6, LED22d5, and LED22d4 in this order, and is output to the LED driver 30 via the cathode C3 of the connection terminal 23 of the fourth LED bar 21d.

[0105] As described above, the second LED bar 21b and the third LED bar 21c are also connected in series to the LED driver 30.

[0106] That is, LED22b1, LED22b2, LED22b3, LED22b10, LED22b11, and LED22b12 mounted on the second LED bar 21b, which are arranged corresponding to the peripheral areas 11B4a and 11B5a that have the same brightness, and LED22c1, LED22c2, LED22c3, LED22c10, LED22c11, and LED22c12 mounted on the third LED bar 21c are connected in series to the LED driver 30.

[0107] Then, a current of 90 mA is supplied from the LED driver 30 via the anode A2 of the connection terminal 23 of the second LED bar 21b, and the current flows through the second LED bar 21b in the order of LED22b1, LED22b2, LED22c3, LED22c10, LED22c11, and LED22c12, and then toward the third LED bar 21c.

[0108] In the third LED bar 21c, a current flows through the LED22c12, LED22c11, LED22c10, LED22c3, LED22c2, and LED22c1 in this order, and is output to the LED driver 30 via the cathode C2 of the connection terminal 23 of the third LED bar 21c.

[0109] Additionally, LEDs 22b4, 22b5, 22b6, 22b7, 22b8, and 22b9 mounted on the second LED bar 21b, which are arranged corresponding to the central region 11A, and LEDs 22c4, 22c5, 22c6, 22c7, 22c8, and 22c9 mounted on the third LED bar 21c, are connected in series to the LED driver 30. A current of 100 mA is supplied from the LED driver 30 via the anode A1 of the connection terminal 23 of the second LED bar 21b, and the current flows in the second LED bar 21b through LEDs 22b4, 22b5, 22b6, 22b7, 22b8, and 22b9 in this order, and then toward the third LED bar 21c.

[0110] In the third LED bar 21c, a current flows through the LED22c9, LED22c8, LED22c7, LED22c6, LED22c5, and LED22c4 in this order, and is output to the LED driver 30 via the cathode C1 of the connection terminal 23 of the third LED bar 21c.

[0111] Furthermore, in the display device 1 according to the first variant of the first embodiment, the currents supplied to the LEDs 22 corresponding to the central region 11A and the peripheral regions 11B1 to 11B14 of the display panel 11 can be set by the LED current setting circuits 31a to 31f included in the LED driver 30, respectively, as shown in FIG. 10.

[0112] (Second embodiment) The configuration of the lighting device 20 included in the display device 1 according to the second embodiment will be described with reference to Fig. 12 and Fig. 13. Fig. 12 is a diagram showing an example of a state in which the display panel 11 included in the display device 1 according to the second embodiment is divided into a plurality of regions according to set brightness. Fig. 13 is a plan view schematically showing an example of wiring in the lighting device 20 included in the display device 1 according to the second embodiment. For ease of explanation, the connection terminals 23 and the LED driver 30 included in the LED bar 21 are omitted from Fig. 13.

[0113] The display device 1 according to the second embodiment differs from the display device 1 according to the first embodiment in the following respects. That is, the number and arrangement of LED bars 21 provided in the lighting device 20 are different. Also, the wiring connecting the multiple LEDs 22 in the LED bar 21 is different. Also, the display panel 11 is different in the areas divided according to brightness and the number of divided areas. In all other respects, the display device 1 according to the second embodiment is similar to the display device 1 according to the first embodiment, and therefore similar components are denoted by the same reference numerals and their description will be omitted.

[0114] 12, the display panel 11 is divided into a central region 11A and a plurality of peripheral regions 11B surrounding the periphery of the central region 11A. The peripheral region 11B is divided into four regions, 11B1b to 11B4b, and the brightness is set for each region.

[0115] For example, the central region 11A of the display panel 11 is divided into an entire region to the left of the left side of the central region 11A (peripheral region 11B1b) and an entire region to the right of the right side of the central region 11A (peripheral region 11B2b). Furthermore, the remaining peripheral region 11B is divided into an area above the top side of the central region 11A (peripheral region 11B3b) and an area below the bottom side of the central region 11A (peripheral region 11B4b).

[0116] Furthermore, the illumination device 20 according to the first embodiment is configured to include four LED bars 21 (first LED bar 21a to fourth LED bar 21d) that extend in the left-right direction of the display panel 11 and are arranged in parallel in the up-down direction of the display panel 11. In contrast to this, the display device 1 according to the second embodiment is configured such that, in addition to the first LED bar 21a to fourth LED bar 21d, fifth LED bar 21e to eighth LED bar 21h that extend in the up-down direction of the display panel 11 are arranged at positions that sandwich the first LED bar 21a to fourth LED bar 21d in the left-right direction.

[0117] In other words, the second LED bar 21b and the third LED bar 21c (first light-emitting element bars), each having a plurality of LEDs 22 mounted thereon in a region corresponding to the central region 11A, are disposed so as to extend in the left-right direction of the display panel 11 at a position corresponding to the central region 11A of the display panel 11. The first LED bar 21a and the fourth LED bar 21d (second light-emitting element bars), each having a plurality of LEDs 22 mounted thereon in regions corresponding to the peripheral regions 11B3b and 11B4b, respectively, are disposed at positions sandwiching the second LED bar 21b and the third LED bar 21c in the up-down direction of the display panel 11. The first LED bar 21a and the fourth LED bar 21d extend in the left-right direction in the same manner as the second LED bar 21b and the third LED bar 21c.

[0118] Furthermore, a fifth LED bar 21e and a sixth LED bar 21f, each equipped with a plurality of LEDs 22 arranged in regions corresponding to the outer peripheral region 11B1b and the outer peripheral region 11B2b, and a seventh LED bar 21g and an eighth LED bar 21h (third light-emitting element bars) are arranged to sandwich the second LED bar 21b and the third LED bar 21c in the left-right direction of the display panel 11. The fifth LED bar 21e and the sixth LED bar 21f, and the seventh LED bar 21g and the eighth LED bar 21h extend in the up-down direction.

[0119] Here, the second LED bar 21b and the third LED bar 21c are connected to the LED driver 30 in series.

[0120] That is, in the second LED bar 21b, LEDs 22b1 to 22b8 are arranged in a region corresponding to the central region 11A at regular intervals along the extension direction of the second LED bar 21b, and LEDs 22b1 to 22b8 are connected in series.

[0121] In addition, in the third LED bar 21c, LEDs 22c1 to 22c8 are arranged in a region corresponding to the central region 11A at regular intervals along the extension direction of the third LED bar 21c, and LEDs 22c1 to 22c8 are connected in series.

[0122] A current of 100 mA input from the LED driver 30 via the anode A1 flows in this order through LED22b8, LED22b7, LED22b6, LED22b5, LED22b4, LED22b3, LED22b2, and LED22b1, and then toward the third LED bar 21c.

[0123] In the third LED bar 21c, a current flows through the LEDs 22c1, 22c2, 22c3, 22c4, 22c5, 22c6, 22c7, and 22c8 in this order, and is output to the LED driver 30 via the cathode C1.

[0124] The first LED bar 21a and the fourth LED bar 21d, which sandwich the second LED bar 21b and the third LED bar 21c in the vertical direction, are connected to the LED driver 30 in series.

[0125] That is, in the first LED bar 21a, LEDs 22a1 to 22a8 are arranged in an area corresponding to the outer peripheral area 11B3b at regular intervals along the extension direction of the first LED bar 21a, and LEDs 22a1 to 22a8 are connected in series.

[0126] In addition, in the fourth LED bar 21d, LEDs 22d1 to 22d8 are arranged in an area corresponding to the outer circumferential area 11B4b at regular intervals along the extension direction of the fourth LED bar 21d, and the LEDs 22d1 to 22d8 are connected in series.

[0127] Then, a current of 90 mA input from the LED driver 30 via the anode A3 flows in this order through the LEDs 22a8, 22a7, 22a6, 22a5, 22a4, 22a3, 22a2, and 22a1, and then toward the fourth LED bar 21d.

[0128] In the fourth LED bar 21d, a current flows through the LEDs 22d1, 22d2, 22d3, 22d4, 22d5, 22d6, 22d7, and 22d8 in this order, and is output to the LED driver 30 via the cathode C3.

[0129] Furthermore, the fifth LED bar 21e to the eighth LED bar 21h, which sandwich the second LED bar 21b and the third LED bar 21c in the left-right direction, are each connected in series to the LED driver 30.

[0130] That is, in the fifth LED bar 21e, LEDs 22e1 to 22e4 are arranged in an area corresponding to the outer peripheral area 11B1b at regular intervals along the extension direction of the fifth LED bar 21e, and LEDs 22e1 to 22e4 are connected in series.

[0131] In addition, the sixth LED bar 21f has LEDs 22f1 to LED22f4 arranged in an area corresponding to the outer circumferential area 11B1b, which are arranged at regular intervals along the extension direction of the sixth LED bar 21f, and the LEDs 22f1 to LED22f4 are connected in series.

[0132] In addition, the seventh LED bar 21g has LEDs 22g1 to 22g4 arranged in an area corresponding to the outer peripheral area 11B2b, which are arranged at regular intervals along the extension direction of the seventh LED bar 21g, and each of LEDs 22g1 to 22g4 is connected in series.

[0133] In addition, in the eighth LED bar 21h, LEDs 22h1 to LED22h4 are arranged in an area corresponding to the outer peripheral area 11B2b at regular intervals along the extension direction of the eighth LED bar 21h, and LEDs 22h1 to LED22h4 are connected in series.

[0134] Then, the current of 85 mA input from the LED driver 30 via the anode A2 flows in the order of LED22e1, LED22e2, LED22e3, and LED22e4, and then toward the sixth LED bar 21f.

[0135] In the sixth LED bar 21f, the current flows through the LED 22f4, the LED 22f3, the LED 22f2, and the LED 22f1 in this order, and then toward the seventh LED bar 21g.

[0136] In the seventh LED bar 21g, current flows through the LED 22g1, LED 22g2, LED 22g3, and LED 22g4 in this order, and then toward the eighth LED bar 21h.

[0137] In the eighth LED bar 21h, a current flows through the LED 22h4, the LED 22h3, the LED 22h2, and the LED 22h1 in this order, and is output to the LED driver 30 via the cathode C2.

[0138] The current to be supplied to the LED 22 can be set by a current setting circuit having a configuration similar to that of the LED driver 30 shown in FIG. 10, for example, and therefore a description thereof will be omitted.

[0139] As described above, in the display device 1 of the second embodiment, the first LED bar 21a, fourth LED bar 21d, fifth LED bar 21e, sixth LED bar 21f, seventh LED bar 21g, and eighth LED bar 21h, each equipped with LEDs 22 (LEDs 22a1 to 22a8, LEDs 22d1 to 22d8, LEDs 22e1 to 22e4, LEDs 22f1 to 22f4, LEDs 22g1 to 22g4, and LEDs 22h1 to 22h4) arranged in the second region 51, can be arranged so as to surround the outer periphery of the second LED bar 21b and third LED bar 21c, which are equipped with LEDs 22 (LEDs 22b1 to 22b8, and LEDs 22c1 to 22c8) arranged in the first region 50.

[0140] Therefore, in the display device 1 of the second embodiment, the brightness of the LEDs 22 in the second region 51 arranged on the periphery of the first region 50 can be reduced below the brightness of the LEDs 22 in the first region 50 corresponding to the central region 11A of the display panel 11 without requiring complex wiring.

[0141] (Third embodiment) The configuration of the lighting device 20 included in the display device 1 according to the third embodiment will be described with reference to Fig. 14 and Fig. 15. Fig. 14 is a diagram showing an example of a state in which the display panel 11 included in the display device 1 according to the third embodiment is divided into a plurality of regions according to set brightness. Fig. 15 is a plan view schematically showing an example of wiring in the lighting device 20 included in the display device 1 according to the third embodiment. For ease of explanation, the connection terminals 23 and the LED driver 30 included in the LED bar 21 are omitted from Fig. 15.

[0142] The display device 1 according to the third embodiment differs from the display device 1 according to the first embodiment in the following respects. That is, the number and arrangement of LED bars 21 provided in the lighting device 20 are different. Also, the wiring connecting the multiple LEDs 22 in the LED bar 21 is different. Also, the display panel 11 is different in the areas divided according to brightness and the number of divided areas. In all other respects, the display device 1 according to the third embodiment is similar to the display device 1 according to the first embodiment, and therefore similar components are denoted by the same reference numerals and their description will be omitted.

[0143] 14, in the display device 1 according to the third embodiment, the display panel 11 is divided into a central region 11A and a plurality of peripheral regions 11B surrounding the periphery of the central region 11A. The peripheral region 11B is divided into four regions, 11B1c to 11B4c, and the brightness is set for each region.

[0144] For example, it is divided into an area (peripheral area 11B3c) above the upper side of the central area 11A of the display panel 11 and an area (peripheral area 11B4c) below the lower side of the central area 11A. The remaining peripheral area is further divided into an area (peripheral area 11B1c) to the left of the left side of the central area 11A and an area (peripheral area 11B2c) to the right of the right side of the central area 11A.

[0145] Furthermore, the illumination device 20 according to the first embodiment is configured to include four LED bars 21 (first LED bar 21a to fourth LED bar 21d) that extend in the left-right direction of the display panel 11 and are arranged in parallel in the up-down direction of the display panel 11. In contrast to this, the display device 1 according to the third embodiment is configured to include the first LED bar 21a and second LED bar 21b (fifth light-emitting element bar) that extend in the left-right direction of the display panel 11 and are arranged in parallel in the up-down direction of the display panel 11, and the third LED bar 21c to fourteenth LED bar 21n (fourth light-emitting element bars) that extend in the up-down direction of the display panel 11 and are arranged in parallel in the left-right direction at positions sandwiched between the first LED bar 21a and the second LED bar 21b.

[0146] More specifically, the third LED bar 21c to the fourteenth LED bar 21n (fourth light-emitting element bars) are arranged in regions corresponding to the central region 11A, the peripheral region 11B1c, and the peripheral region 11B2c of the display panel 11. Among the third LED bar 21c to the fourteenth LED bar 21n, the LEDs 22g1, LED 22g2, LED 22h1, LED 22h2, LED 22i1, LED 22i2, LED 22j1, and LED 22j2 mounted on the seventh LED bar 21g to the tenth LED bar 21j are LEDs 22 arranged in a first region 50 corresponding to the central region 11A. The other LEDs 22 are LEDs 22 arranged in a second region 51 corresponding to the peripheral region 11B (peripheral regions 11B1c, 11B2c).

[0147] Furthermore, the intervals at which the seventh to tenth LED bars 21g to 21j are arranged are smaller than the intervals at which the third to sixth LED bars 21f and the eleventh to fourteenth LED bars 21k to 21n are arranged. Therefore, the LEDs 22 mounted on the seventh to tenth LED bars 21g to 21j are arranged more densely than the LEDs 22 mounted on the third to sixth LED bars 21f and the eleventh to fourteenth LED bars 21k to 21n.

[0148] Here, all of the LEDs 22 mounted on each of the third LED bar 21c to the eighth LED bar 21h are connected in series to the LED driver 30, and a current of, for example, 90 mA input from the LED driver 30 via the anode A3 flows from the third LED bar 21c to the eighth LED bar 21h and is output to the LED driver 30 via the cathode C3.

[0149] In addition, all of the LEDs 22 mounted on each of the 9th LED bar 21i to 14th LED bar 21n are connected in series to the LED driver 30, and a current of, for example, 90 mA input from the LED driver 30 via the anode A4 flows from the 14th LED bar 21n to the 9th LED bar 21i and is output to the LED driver 30 via the cathode C4.

[0150] As such, the current flowing through the third LED bar 21c to the eighth LED bar 21h and the current flowing through the fourteenth LED bar 21n to the ninth LED bar 21i are both 90 mA, but as described above, the LEDs 22 mounted on each of the seventh LED bar 21g to the tenth LED bar 21j are densely arranged, and the area of ​​the display panel 11 illuminated by these densely arranged LEDs 22 (central area 11A) is brighter than the other areas (peripheral areas 11B1c, 11B2c).

[0151] All of the LEDs 22 mounted on the first LED bar 21a are connected in series to the LED driver 30, and a current of 90 mA is input from the LED driver 30 via the anode A1 and output to the LED driver 30 via the cathode C1.

[0152] In addition, all of the LEDs 22 mounted on the second LED bar 21b are connected in series to the LED driver 30, and a current of 90 mA is input from the LED driver 30 via the anode A2 and output to the LED driver 30 via the cathode C2.

[0153] As described above, in the display device 1 of the third embodiment, by changing the spacing between the LED bars 21 in the area where the third LED bar 21c to the fourteenth LED bar 21n (fourth light-emitting element bar) are arranged, it is possible to realize areas of high brightness and areas of low brightness on the display panel 11.

[0154] Therefore, the display device 1 of the third embodiment can reduce the brightness of the peripheral region 11B arranged on the periphery of the central region 11A of the display panel 11 more than the brightness of the central region 11A, simply by setting the current supplied to the third LED bar 21c to the fourteenth LED bar 21n and the current supplied to the first LED bar 21a and the second LED bar 21b.

[0155] Therefore, the display device 1 according to the third embodiment can reduce the brightness of only the peripheral area 11B around the central area 11A of the display panel 11 without reducing the brightness of the central area 11A.

[0156] (Fourth embodiment) The configuration of the lighting device 20 included in the display device 1 according to the fourth embodiment will be described with reference to Fig. 16. Fig. 16 is a plan view schematically showing an example of wiring in the lighting device 20 included in the display device 1 according to the fourth embodiment. For ease of explanation, the connection terminals 23 and the LED driver 30 included in the LED bar 21 are omitted from Fig. 16.

[0157] The display device 1 according to the fourth embodiment differs from the display device 1 according to the first embodiment in the following respects. That is, the wiring that connects the plurality of LEDs 22 in the LED bar 21 is different. Also, the display panel 11 is different in the areas divided according to brightness and the number of divided areas. In all other respects, the display device 1 according to the fourth embodiment is similar to the display device 1 according to the first embodiment, and therefore similar components are designated by the same reference numerals and their description will be omitted.

[0158] That is, in the display device 1 according to the fourth embodiment, the display panel 11 is divided into areas with different luminance levels as shown in FIG. 14, similarly to the display device 1 according to the third embodiment.

[0159] As shown in Figure 16, in the display device 1 of the fourth embodiment, similar to the display device 1 of the first embodiment, the first LED bar 21a to the fourth LED bar 21d extending in the left-right direction are arranged in parallel in the up-down direction.

[0160] The first LED bar 21a and the fourth LED bar 21d have the same configuration in which 12 LEDs 22 are arranged at regular intervals along the extension direction and connected to an LED driver 30 in series.

[0161] In the first LED bar 21a, a current of 90 mA is input from the LED driver 30 via the anode A1 and output to the LED driver 30 via the cathode C1. Meanwhile, in the fourth LED bar 21d, a current of 90 mA is input from the LED driver 30 via the anode A2 and output to the LED driver 30 via the cathode C2.

[0162] The LEDs 22a1 to 22a12 arranged in the first LED bar 21a correspond to the outer peripheral region 11B3c of the display panel 11 shown in FIG. 14 and are the LEDs 22 arranged in the second region 51.

[0163] 14. LEDs 22d1 to 22d12 arranged in the fourth LED bar 21d correspond to the outer peripheral region 11B4c of the display panel 11 shown in FIG.

[0164] The second LED bar 21b and the third LED bar 21c are connected in series to the LED driver 30. More specifically, LEDs 22b1 to 22b3 and LEDs 22b10 to 22b12 mounted on the second LED bar 21b and LEDs 22c1 to 22c3 and LEDs 22c10 to 22c12 mounted on the third LED bar 21c are connected in series between an anode A3 and a cathode C3 connected to the LED driver 30. A current of 90 mA is supplied from the LED driver 30 to the second LED bar 21b and the third LED bar 21c via the anode A3, and is output to the LED driver 30 from the cathode C3.

[0165] Furthermore, LEDs 22b4 to 22b9 mounted on the second LED bar 21b and LEDs 22c4 to 22c9 mounted on the third LED bar 21c are connected in series between anode A3 and cathode C3 connected to the LED driver 30. A current of 100 mA is supplied from the LED driver 30 to the second LED bar 21b and the third LED bar 21c via anode A4, and is output to the LED driver 30 from cathode C4.

[0166] With the above simple configuration, it is possible to supply a current of 100 mA to the LEDs 22 arranged in the first region 50 of the LED bar 21, which corresponds to the central region 11A of the display panel 11, and a current of 90 mA to the LEDs 22 arranged in the second region 51 of the LED bar 21, which corresponds to the peripheral region 11B of the display panel 11.

[0167] Therefore, the display device 1 according to the third embodiment can reduce the brightness of only the peripheral area 11B around the central area 11A of the display panel 11 without reducing the brightness of the central area 11A.

[0168] The values ​​of the current supplied to the LED 22 shown in the first embodiment, the first modified example of the first embodiment, and the second to fourth embodiments are merely examples and are not limited to the above values.

[0169] Furthermore, the LEDs 22 described above are LED chips, but may also be mini LED chips. When the LEDs 22 are mini LED chips, the number of divisions into which the display panel 11 is divided into a plurality of regions can be further increased according to the brightness. [Explanation of symbols]

[0170] 1 Display device 11 Display panel 11A Central area 11B Outer area 15 Backlight chassis 20 Lighting equipment 21 LED Bar 23 Connection terminal 30 LED drivers 31a Current setting circuit 31b Current setting circuit 31c current setting circuit 31d Current setting circuit 31e Current setting circuit 31f current setting circuit 50 1st area 51 Second area

Claims

1. A display panel; a light emitting element substrate disposed on the rear side of the display panel and including a plurality of light emitting elements; a drive circuit for controlling the light emission of each of the plurality of light-emitting elements; Equipped with the light-emitting element substrate includes a first region in which a plurality of the light-emitting elements are arranged corresponding to a central region of a predetermined range including a center of the display panel, and a second region in which the plurality of light-emitting elements are arranged so as to surround an outer periphery of the first region, A display device in which the driving circuit controls the current supplied to each of the light-emitting elements so that the brightness of the light-emitting elements arranged in the second region of the light-emitting element substrate is lower than that of the light-emitting elements arranged in the first region.

2. the light-emitting element substrate includes a plurality of light-emitting element bars on which a plurality of the light-emitting elements are mounted, and each of the plurality of light-emitting element bars extends along a first direction of the display panel and is arranged in parallel in a second direction perpendicular to the first direction of the display panel; The display device described in claim 1, wherein in each of the plurality of light-emitting element bars, a set of light-emitting element bars among the plurality of light-emitting element bars to which the same current is supplied to the light-emitting element arranged in the first region is connected in parallel to the drive circuit so that a first current is supplied to the light-emitting element arranged in the second region and a second current smaller than the first current is supplied to the light-emitting element arranged in the second region.

3. the light-emitting element substrate includes a plurality of light-emitting element bars on which a plurality of the light-emitting elements are mounted, and each of the plurality of light-emitting element bars extends along a first direction of the display panel and is arranged in parallel in a second direction perpendicular to the first direction of the display panel; The display device described in claim 1, wherein in each of the plurality of light-emitting element bars, a set of light-emitting element bars among the plurality of light-emitting element bars to which the same current is supplied to the light-emitting element arranged in the first region is connected in series to the drive circuit so that a first current is supplied to the light-emitting element arranged in the first region and a second current smaller than the first current is supplied to the light-emitting element arranged in the second region.

4. 4. The display device described in claim 2 or 3, wherein the second region is divided into a plurality of divided regions in each of the first direction and the second direction of the display panel, and the drive circuit controls the current supplied to each of the light-emitting elements included in each of the divided regions so that the current supplied to the light-emitting elements included in the divided regions that are farther away from the first region is smaller than the current supplied to the light-emitting elements included in the divided regions that are closer to the first region.

5. the light emitting element substrate includes a plurality of light emitting element bars on which a plurality of the light emitting elements are mounted, Among the plurality of light emitting element bars, one or more first light-emitting element bars on which the light-emitting elements to be arranged in the first region are mounted are arranged at positions corresponding to the central region of the display panel so as to extend along a first direction of the display panel, a plurality of second light-emitting element bars on which the light-emitting elements to be arranged in the second region are mounted sandwich the first light-emitting element bar in a second direction perpendicular to the first direction of the display panel, and are arranged to extend along the first direction of the display panel; The display device described in claim 1, wherein a plurality of third light-emitting element bars mounted with the light-emitting elements arranged in the second region are arranged to sandwich the first light-emitting element bar in the first direction of the display panel and extend along the second direction of the display panel.

6. the light emitting element substrate includes a plurality of fourth light emitting element bars on which a plurality of the light emitting elements arranged in the first region or the second region are mounted; a plurality of fifth light-emitting element bars extending along a first direction of the display panel, arranged to sandwich the plurality of fourth light-emitting element bars in a second direction perpendicular to the first direction of the display panel, and having a plurality of the light-emitting elements arranged in the second region mounted thereon; the plurality of fourth light emitting element bars extend along the second direction of the display panel and are arranged in parallel in the first direction of the display panel at intervals from one another; The display device described in claim 1, wherein the spacing between the fourth light-emitting element bars, among the plurality of fourth light-emitting element bars, on which the light-emitting elements arranged in the first region are mounted, is smaller than the spacing between the fourth light-emitting element bars on which the light-emitting elements arranged in the second region are mounted.

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