Planar lighting device

Abstract

A planar lighting device (1) according to an embodiment is provided with a substrate (3), a plurality of light sources (4) in a first group, and one or more light sources (5) in a second group. A predetermined electrical wiring is laid on the substrate (3). The plurality of light sources (4) of the first group are arranged across substantially the entire surface of the substrate (3). The one or more light sources (5) of the second group are disposed in a predetermined region of the substrate (3) so as to be adjacent to the plurality of light sources (4) of the first group.

Description

Technical Field

[0001] The invention relates to a planar lighting device. Background Art

[0002] There is a combination meter that integrates various meters required for driving, such as a speedometer, a tachometer, and an odometer of a car (for example, see Patent Document 1, etc.). This combination meter includes an indicator unit such as a warning light, but the indicator unit has a color specified by law, and it is required that the indicator unit can be visually confirmed in any environment without insufficient brightness even when it is irradiated with direct sunlight.

[0003] Nowadays, such combination meters tend to display with high degree of freedom by using a liquid crystal panel and a backlight, but the indicator unit requires high brightness and high color rendering, so in many cases it is provided independently of the liquid crystal panel. That is, the indicator unit is composed of a light shielding member in which the shape of the icon to be displayed is hollowed out, and a single-color LED (Light Emitting Diode) corresponding to the specified display color arranged just below the light shielding member.

[0004] It should be noted that the following display device has been disclosed, which is not the indicator part of the combination meter itself, but is provided with a different backlight so as to display a fixed pattern such as a touch switch pattern side by side with a non-fixed pattern such as map information and an onboard camera image (for example, refer to Patent Document 2, etc.). Alternatively, sometimes a warning display for approaching vehicles is also independently provided for the rear, but the door rearview mirror and the interior rearview mirror also tend to be displayed by a liquid crystal panel and a backlight, and sometimes an indicator part such as an approach warning display is also provided in the display device.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 9-301065

[0008] Patent Document 2: Japanese Patent Application Publication No. 2019-152748 Summary of the invention

[0009] Problems to be solved by the invention

[0010] As described above, when the indicator portion of the instrument cluster is provided separately from the liquid crystal panel and its backlight for other parts, or when the indicator portion of the door mirror or the interior mirror is provided separately from the liquid crystal panel and its backlight for other parts, the structure is complicated and it is difficult to reduce the cost. In addition, since the indicator portion cannot be used for other displays, there is a problem that the display screen cannot be fully utilized and the degree of freedom of the screen display cannot be increased.

[0011] The present invention has been completed in view of the above situation, and its purpose is to provide a planar lighting device that can be used as a backlight for a combination meter, a door mirror, an interior mirror, etc. having an indicator part, and can cope with high brightness and high color rendering like the indicator part, etc., has a simple structure, can achieve effective use of the display screen, and improve the freedom of screen display.

[0012] Solutions for solving problems

[0013] In order to solve the above problems and achieve the purpose, a planar lighting device according to one embodiment of the present invention comprises a substrate, a plurality of light sources of a first group, and one or more light sources of a second group. The substrate is provided with predetermined electrical wiring. The plurality of light sources of the first group are arranged over substantially the entire surface of the substrate. The one or more light sources of the second group are arranged adjacent to the plurality of light sources of the first group in a predetermined area of ​​the substrate.

[0014] A planar lighting device according to one embodiment of the present invention can be used as a backlight for a combination meter having an indicator part, a door mirror, an interior mirror, etc. It can cope with high brightness and high color rendering like the indicator part, etc. It has a simple structure and can achieve effective use of the display screen and increase the freedom of screen display. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a perspective view of the appearance of a planar lighting device according to one embodiment.

[0016] Figure 2 This is an exploded perspective view of the main parts of the planar lighting device.

[0017] Figure 3 It is a top view showing only the substrate and the reflector.

[0018] Figure 4 yes Figure 1 X-X cross-sectional view of the planar lighting device.

[0019] Figure 5 The figure shows an example of the influence on brightness uniformity and the improvement thereof by adding a second group of light sources and removing a part of the reflecting wall of the reflector.

[0020] Figure 6 This is an external perspective view showing an example of a state in which a liquid crystal panel is attached to the planar lighting device.

[0021] Figure 7 It is a diagram showing an example of an indicator portion displayed on a liquid crystal panel. DETAILED DESCRIPTION

[0022] Hereinafter, the planar lighting device of the embodiment will be described with reference to the accompanying drawings. It should be noted that the present invention is not limited to the present embodiment. In addition, the dimensional relationship of each element in the drawings, the proportion of each element, etc. may sometimes be different from the actual one. Sometimes the drawings may include parts with different dimensional relationships and proportions. In addition, the contents described in one embodiment or variant example are also applicable to other embodiments or variant examples in principle.

[0023] Figure 1 1 is a perspective view of the appearance of a planar lighting device 1 according to an embodiment. In the figure, for convenience, the long dimension direction of the planar lighting device 1 is set as the X-axis direction, the short dimension direction is set as the Y-axis direction, and the thickness direction is set as the Z-axis direction, but the posture when used is arbitrary. Figure 2 is an exploded perspective view of the main parts of the planar lighting device 1. Figure 1 The same is true for the diagram when viewed from the emission surface side. Figure 3 It is a plan view showing only the substrate 3 and the reflector 6 . Figure 4 yes Figure 1 The XX-sectional view of the planar lighting device 1 in FIG. Figure 1 A cross section of a portion of the upper side.

[0024] Figure 1 In the present invention, the planar lighting device 1 has a substantially rectangular (may also be substantially square) and substantially plate-shaped appearance, and is composed of a bottom frame ( Figure 1 The housing is formed by a top frame 10 covering the opening side of the bottom frame and the top frame 10. The top frame 10 is provided with an emission surface 1a through a substantially rectangular opening 10a, and light is radiated from the inside of the planar lighting device 1 to the outside. Figure 1 In the case where the planar lighting device 1 is used as a backlight for a vehicle-mounted combination meter, a door mirror, an interior mirror, etc., a liquid crystal panel or the like is attached to the side of the emission surface 1a.

[0025] Figure 2 In the figure, the planar lighting device 1 is in the following shape: a substrate 3 having a first group of multiple (many) light sources 4 and one or more (six in the illustrated example) light sources 5 of a second group, a reflector 6, a diffuser 7, a prism sheet 8 and a polarized reflection film 9 are assembled on a bottom frame 2, and a top frame 10 is embedded in the outer side of the bottom frame 2 to form a cover.

[0026] The bottom frame 2 has a bottom and four side walls provided on the outer periphery of the bottom. The bottom frame 2 is formed by die casting, sheet metal, etc. A substrate 3 is fixed to the inner side of the bottom of the bottom frame 2 via a fixing member (not shown) composed of a double-sided tape or the like.

[0027] On the substrate 3, a plurality (many) of first group light sources 4 composed of LEDs (Light Emitting Diodes) and the like are arranged in a grid shape over substantially the entire surface. In addition, in a predetermined area on the substrate 3, such as a portion of the upper long side in the figure, one or more second group light sources 5 are arranged adjacent to the plurality of first group light sources 4. Each second group light source 5 is arranged, for example, in the center of four first group light sources 4 arranged at the corners of an imaginary rectangle (without interfering with the first group light source 4). The substrate 3 is provided with electrical wiring for supplying power to each light source 4, 5. Each light source 4, 5 can independently control light emission.

[0028] Between the first group of light sources 4 on the substrate 3, via Figure 2 The back surface of the reflector 6 is fixed to a fixing member (not shown) composed of a plurality of short strips of double-sided tape extending in the left-right direction (or the up-down direction).

[0029] The reflector 6 is used to reflect the light emitted from the first group of light sources 4 toward the exit surface side to increase the brightness. The reflector 6 is surrounded by a frame 6a whose outer edge also serves as a reflection wall, and the inside of the reflector 6 is a plurality of (many) sections surrounded by four reflection walls 6b. Most of the reflector 6 is a section (first section) corresponding to each first group of light sources 4, and the portion corresponding to the indicator portion such as a warning light is a section corresponding to the four first group of light sources 4 arranged vertically and horizontally and the second group of light sources 5 in the center. In the section (second section) corresponding to the indicator portion, the four reflection walls 6b between the four first group of light sources 4 are removed, and the second group of light sources 5 is arranged in the space formed by removing the four reflection walls 6b. As a result, the shape is as follows: the four first group of light sources 4 and the second group of light sources 5 in the center are surrounded by four reflection walls 6b (one of the reflection walls 6b is a part of the frame 6a). The reflector 6 is manufactured by injection molding of synthetic resin or the like. It should be noted that, in the above embodiment, the four reflective walls 6b are removed as a whole, but as long as the space for configuring the second group of light sources can be ensured, a portion of each of the four reflective walls 6b can be retained. In addition, the configuration position of the second segment is arbitrary. For example, the first segment can be sandwiched between adjacent second segments, and the second segment can be arranged at a position away from the frame 6a inward. In the case where the overall shape of the reflector 6 is irregular when viewed from above, the second segment can be arranged only in the rectangular portion other than the irregular portion. In addition, it is also possible that a plurality of second segments correspond to one icon.

[0030] In addition, the plurality of light sources 4 of the first group are elements that emit light from the side, and the one or more light sources 5 of the second group are elements that emit light from the top surface. That is, the light emitted from the side of the first group of light sources 4 is reflected by the reflection wall 6b of the reflector 6 and emitted in the direction substantially normal to the emission surface. In addition, the light emitted from the top surface of the second group of light sources 5 is directly emitted in the direction substantially normal to the emission surface.

[0031] The diffuser 7 disposed on the exit side of the reflector 6 is a member that reduces uneven brightness by diffusing the light passing therethrough. It should be noted that a tiny corner cube prism is provided on the incident side of the diffuser 7 (the light source 4, 5 side, the reflector 6 side) with the apex of a quadrangular pyramid (the apex not in contact with the bottom surface) facing the light source 4, 5 side and the bottom surface facing the exit side. The corner cube prism may be provided on the entire surface of the diffuser 7 or only in the area corresponding to the indicator portion where the second group of light sources 5 is provided. It should be noted that an optical sheet provided with a plurality of corner cube prisms may be provided on the incident side of the diffuser 7 in a manner separate from the diffuser 7.

[0032] The corner cube prism diffuses the light emitted from the side of the first group of light sources 4 and reflected by the reflection wall 6b of the reflector 6 and the light emitted from the top surface of the second group of light sources 5 to the surroundings to reduce brightness unevenness. It should be noted that, according to the specifications related to brightness uniformity, the diffuser 7 does not necessarily need to be provided with a corner cube prism, and a prism of other shapes other than a corner cube may also be provided.

[0033] The prism sheet 8 disposed on the light-emitting side of the diffuser 7 adjusts light distribution to increase brightness.

[0034] The polarizing reflective film 9 disposed on the emission side of the prism sheet 8 is a member that transmits polarized light in a predetermined direction and reflects polarized light in a direction orthogonal to the predetermined direction, and matches the polarization direction of the liquid crystal panel attached to the outside.

[0035] A top frame 10 is disposed on the light-emitting surface side of the polarizing reflective film 9, and the top frame 10 is fixed to the bottom frame 2. The top frame 10 is formed by die casting, sheet metal, or the like.

[0036] It should be noted that although the planar lighting device 1 is shown in the figure as being planar, the planar lighting device 1 may also be curved. In this case, for example, the bottom frame 2, the substrate 3, the reflector 6, and the top frame 10 are formed into curved surfaces, and the diffuser 7, the prism sheet 8, and the polarized reflective film 9 are deformed into curved surfaces during assembly.

[0037] Figure 5 The diagrams show the influence of adding the second light source group 5 and removing a part of the reflective wall of the reflector 6 on the brightness uniformity and the improvement thereof. The topmost (a) is a top view showing an example of brightness distribution of the planar lighting device 1' of the first comparative example in which the second light source group is not provided and a part of the reflective wall of the reflector is not removed. In this case, the surrounding brightness is slightly reduced, but the brightness uniformity is mostly maintained.

[0038] (b) in the second section from top to bottom is a top view showing an example of brightness distribution in a state where only the first group of light sources is lit in a second comparative example planar lighting device 1" in which a second group of light sources is provided and a portion of the reflective wall of the reflector is removed. In this case, brightness unevenness occurs near the upper long side due to the removal of the reflective wall of the reflector, but since the number and configuration position of the first group of light sources are the same as those in the first comparative example, the influence thereof is small. It should be noted that the second comparative example in which a second group of light sources is provided and a portion of the reflective wall of the reflector is removed is different from Figure 1 to Figure 4 Compared with the embodiment shown, the brightness uniformity is slightly worse, but it can also be adopted as other embodiments.

[0039] (c) of the third section from top to bottom is a top view showing an example of brightness distribution when the first group of light sources and the second group of light sources are turned on in a planar lighting device 1" of a second comparative example in which a second group of light sources is provided and a portion of the reflective wall of the reflector is removed. In this case, in addition to the smooth brightness distribution of (b), the highest brightness distribution generated by the lighting of the second group of light sources can also be seen, and high brightness of the indicator portion can be expected.

[0040] The fourth paragraph from the top to the bottom (d) means Figure 1 to Figure 4 FIG. 1 is a plan view showing an example of brightness distribution in a state where only the first group of light sources 4 is turned on in the planar lighting device 1 according to the embodiment of FIG. In this case, compared with the brightness distribution of (b), the brightness unevenness is reduced due to the diffusion effect of the corner cube prisms of the diffuser 7.

[0041] The fifth paragraph (e) from the top means Figure 1 to Figure 4 FIG. 1 is a top view of an example of brightness distribution in a state where the first group of light sources 4 and the second group of light sources 5 are turned on in the planar lighting device 1 of the embodiment of FIG. 2 . In this case, compared with the brightness distribution of (c), the highest brightness distribution is eliminated due to the diffusion effect of the corner cube prism of the diffuser 7. Therefore, the use of a diffuser with a corner cube prism is effective when uniformity is prioritized over brightness.

[0042] Figure 6 1 is an external perspective view showing an example of a state where a liquid crystal panel 20 is attached to the planar lighting device 1. The front side in the figure is a display surface 20a of the liquid crystal panel 20. The liquid crystal panel 20 includes a color liquid crystal panel and a monochrome liquid crystal panel.

[0043] Figure 72 is a diagram showing an example of an indicator portion 20b displayed on a liquid crystal panel 20. When a color liquid crystal panel is configured as the liquid crystal panel 20, the first group of light sources 4 and the second group of light sources 5 can be light sources that emit light in white or approximately white. In this case, the graphics and colors of various warning lights of the indicator portion 20b are represented by images reproduced by the color liquid crystal panel, and are illuminated from behind by the second group of light sources 5 with white or approximately white light, thereby displaying various warning lights. In addition, not only the second group of light sources 5 is lit, but also the first group of light sources 4 around the second group of light sources 5 are lit at the same time, thereby further improving the brightness of the display of the warning lights. It should be noted that even when a color liquid crystal panel is used, the brightness of the warning lights can be further improved by causing the second group of light sources 5 to emit light in a color corresponding to the icon to be displayed.

[0044] It should be noted that at least one of the first light source group 4 and the second light source group 5 can also be a light source that integrates red, green and blue (RGB) monochromatic LEDs into one. LEDs that integrate the light-emitting chips of RGB into one package are available on the market. If the light-emitting chips of RGB are lit at the same time, white light can be obtained. If any one of the light-emitting chips of RGB is lit, any monochromatic light of RGB can be obtained. If the ratio of the light emission of the RGB chips is changed, monochromatic light of any color can be obtained. In this way, the components of the light source can be unified.

[0045] In addition, when a monochrome liquid crystal panel is configured as the liquid crystal panel 20, the first light source group 4 can be a light source that emits light in white, approximately white, or a predetermined color, and the second light source group 5 can be a light source that emits light in a color corresponding to the icon to be displayed (including white and approximately white). In this case, the graphics of various warning lights of the indicator portion 20b are displayed by the image reproduced by the monochrome liquid crystal panel, and the colors of various warning lights are displayed by the colors of the illumination from the back by the second light source group 5. It should be noted that, in this case, at least one of the first light source group 4 and the second light source group 5 can also be a light source that integrates red, green, and blue (RGB) monochrome LEDs.

[0046] In addition, regardless of whether a color liquid crystal panel or a monochrome liquid crystal panel is configured as the liquid crystal panel 20, any image (speedometer, tachometer, map image, TV image, etc.) can be displayed over the entire surface of the display surface 20a including the indicator portion 20b. In this case, the planar lighting device 1 is illuminated by the first group of light sources 4. In addition, an icon corresponding to a warning light or the like realized by a specified color can be displayed on the indicator portion 20b in a manner overlapping with the image of other parts. It should be noted that in order to ensure the visual confirmation of the icon, when the icon is displayed overlapping with various instruments, etc., an icon with a mark configured in a black background can be used, or the display of various instruments or the like in the overlapping portion can be turned off, or the indicator portion 20b and various instruments or the like can be displayed alternately. In addition, when used as a combination instrument, while the indicator portion 20b is displayed, various instruments required for driving, such as a speedometer and a tachometer, can be displayed on the portion other than the indicator portion 20b. Furthermore, when used as a door mirror or an interior mirror, it is possible to display images captured by cameras such as the rear and side areas on portions other than the indicator portion 20b simultaneously with the display on the indicator portion 20b.

[0047] As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, Various changes are possible as long as they do not deviate from the summary.

[0048] As described above, the planar lighting device of the embodiment includes: a substrate on which predetermined electrical wiring is laid; a first group of multiple light sources arranged over substantially the entire surface of the substrate; and one or more second group of light sources arranged adjacent to the first group of multiple light sources in a predetermined area of ​​the substrate. Thus, the planar lighting device can be used as a backlight for a combination meter, a door mirror, an interior mirror, etc. having an indicator portion, and can handle high brightness and high color rendering like an indicator portion, and has a simple structure, and can realize effective use of a display screen and improve the degree of freedom of screen display.

[0049] That is, the indicator part and the like are mainly illuminated by the second light source group, and the parts other than the indicator part and the like are illuminated by the first light source group, so it can be used as a backlight for a combination meter, a door mirror, an interior mirror, etc. having an indicator part. In addition, since the second light source group is provided separately from the first light source group, the brightness of the second light source group can be easily increased, and it can also emit light in any color, so it can cope with the high brightness and high color rendering required by the indicator part and the like. In addition, since the first light source group and the second light source group are arranged on one substrate, the structure is simple and low cost can be achieved. In addition, since the entire screen can be used for the parts other than the indicator part and the like by the first light source group, the display screen can be effectively utilized. In addition, by displaying the indicator part and the like and the parts other than the indicator part by the liquid crystal panel provided on the emission side, it is not necessary to hollow out the light shielding member in the shape of an icon dedicated to the indicator part, so the degree of freedom of screen display can be improved.

[0050] In addition, the plurality of light sources of the first group are arranged in a grid pattern over substantially the entire surface of the substrate, and one or more light sources of the second group are arranged between adjacent light sources of the first group. Thus, the plurality of light sources of the first group can be arranged in the same manner as in the prior art without an indicator unit, and thus the function as a backlight of an indicator unit can be performed while maintaining the function as a backlight of a combination meter or the like.

[0051] In addition, a reflector is provided, the reflector having reflecting walls respectively surrounding the first group of multiple light sources, the first group of multiple light sources are arranged in a grid shape over substantially the entire surface of the substrate, the second group of light sources is arranged in the center of the four light sources of the first group adjacent to each other vertically and horizontally, and at least a part of the four reflecting walls between the four light sources of the first group where the second group of light sources are arranged in the center is removed. Thus, the brightness achieved by the reflector can be improved, and the second group of light sources can be additionally arranged.

[0052] In addition, the plurality of light sources of the first group are elements that emit light from the side surface, and the one or more light sources of the second group are elements that emit light from the top surface. Thus, light can be emitted in accordance with the presence or absence of a reflective wall of the reflector. That is, by making the first group of light sources emit light toward the reflective wall and making the second group of light sources that are not surrounded by the reflective wall emit light toward the emission side, light distribution in a substantially normal direction can be effectively obtained.

[0053] In addition, an optical sheet is provided on the emission side, and the optical sheet is provided with a plurality of tiny corner cube prisms with vertices facing the light source side. Thus, through the diffusion effect of the corner cube prisms, the brightness unevenness caused by the addition of one or more light sources in the second group and the brightness unevenness caused by the removal of the reflection wall of the reflector are reduced, and the brightness uniformity can be improved.

[0054] In addition, a color liquid crystal panel is arranged on the emission side, and the plurality of light sources of the first group emit light in white or approximately white, and the one or more light sources of the second group emit light in white, approximately white, or a prescribed color corresponding to the icon. Thus, the color display of the color liquid crystal realizes the light color required by the indicator part, etc. In addition, by making not only the second group of light sources emit light but also the surrounding first group of light sources emit light, the brightness of the indicator part, etc. can be improved. The one or more light sources of the first group and the second group can also be a light source that integrates red, green, and blue single-color LEDs into one.

[0055] Furthermore, when illuminating a predetermined area of ​​the substrate, one or more light sources of the second group arranged in the predetermined area are illuminated, or a plurality of light sources of the first group arranged in the predetermined area and one or more light sources of the second group arranged in the predetermined area are illuminated. Thus, an indicator portion or the like can be displayed by illuminating the second group of light sources, and the brightness can be increased by adding the first group of light sources.

[0056] In addition, a monochrome liquid crystal panel is arranged on the emission side, and the plurality of light sources of the first group emit light in white, near white, or a specified color, and the one or more light sources of the second group emit light in a color corresponding to the icon displayed in the specified area. Thus, the light color required by the indicator part etc. is realized by the light color of the light source of the second group. The one or more light sources of the first group and the second group may also be a light source that integrates red, green, and blue monochrome LEDs into one.

[0057] Furthermore, the light sources of the first group and / or the second group are light sources that integrate red, green, and blue single-color LEDs into one, thereby unifying the elements of the light sources.

[0058] In addition, the planar lighting device of the embodiment can also be applied to warning light displays of door mirrors and interior mirrors, in addition to warning displays of combination meters, and can also be applied to visual blind spot warnings (warning of approaching vehicles from the rear or side).

[0059] In addition, the present invention is not limited to the above-mentioned embodiments. The schemes formed by appropriately combining the above-mentioned constituent elements are also included in the present invention. In addition, those skilled in the art can easily derive further effects and variations. Therefore, the more extensive schemes of the present invention are not limited to the above-mentioned embodiments, and various changes can be made.

[0060] Description of Reference Numerals

[0061] 1: planar lighting device; 1a: exit surface; 2: bottom frame; 3: substrate; 4, 5: light source; 6: reflector; 6a: frame; 6b: reflection wall; 7: diffuser; 8: prism sheet; 9: polarized reflection film; 10: top frame; 10a: opening; 20: liquid crystal panel; 20a: display surface; 20b: indicator part.

Claims

1. A planar lighting device, comprising: Baseboard, with specified electrical wiring; A first group of multiple light sources is arranged over substantially the entire surface of the substrate; and The one or more light sources of the second group are arranged adjacent to the plurality of light sources of the first group in a predetermined area of ​​the substrate.

2. The planar lighting device according to claim 1, wherein: The plurality of light sources of the first group are arranged in a grid pattern over substantially the entire surface of the substrate. The one or more light sources of the second group are arranged between adjacent light sources of the first group.

3. The planar lighting device according to claim 1 or 2, wherein: A reflector is provided, the reflector having a reflecting wall surrounding each of the plurality of light sources of the first group, The plurality of light sources of the first group are arranged in a grid pattern over substantially the entire surface of the substrate. The second group of light sources is arranged at the center of the four light sources of the first group that are adjacent to each other vertically and horizontally. At least a portion of the four reflective walls between the four light sources of the first group in which the second light source of the second group is centrally arranged is removed.

4. The planar lighting device according to any one of claims 1 to 3, wherein: The first group of multiple light sources are elements that emit light from the side, The one or more light sources of the second group are elements that emit light from the top surface.

5. The planar lighting device according to any one of claims 1 to 4, wherein: An optical sheet is provided on the emission side, and the optical sheet is provided with a plurality of tiny corner cube prisms with vertices facing the light source side.

6. The planar lighting device according to any one of claims 1 to 5, wherein: A color liquid crystal panel is arranged on the output side. The first group of multiple light sources emits white or approximately white light, The one or more light sources of the second group emit light in white, nearly white, or a predetermined color corresponding to the icon.

7. The planar lighting device according to claim 6, wherein: When illuminating a specified area of ​​the substrate, one or more light sources of the second group arranged in the specified area emit light, or a plurality of light sources of the first group arranged in the specified area and one or more light sources of the second group arranged in the specified area emit light.

8. The planar lighting device according to any one of claims 1 to 5, wherein: A monochrome liquid crystal panel is arranged on the output side. The plurality of light sources of the first group emit light in white, near white or a predetermined color, The one or more light sources of the second group emit light in a color corresponding to the icon displayed in the predetermined area.

9. The planar lighting device according to any one of claims 1 to 8, wherein: The light sources of the first group and / or the second group are light sources that integrate red, green and blue single-color LEDs into one.

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