JP2009026635A - Lighting system, and liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide white light formed by sufficiently mixing colors, in relation to a lighting system having a plurality of light sources arranged on a side surface of a light guide body, and a liquid crystal display device equipped with it. <P>SOLUTION: This lighting system is provided with the light guide body 14 diffusing and guiding light entering from an entrance plane, and a plurality of light emitting diodes 16R, 16G and 16B arranged in an arrangement direction along the entrance plane 14a of the light guide body 14. Colors of light rays of the light emitting diodes 16R, 16G and 16B adjacent to one another are different from one another, and intervals A between the light emitting diodes 16R, 16G and 16B adjacent to one another at an end in the arrangement direction are smaller than intervals B between the light emitting diodes 16R, 16G and 16B adjacent to one another at the center part in the arrangement direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an illumination device having a plurality of light sources arranged on a side surface of a light guide, and a liquid crystal display device including the illumination device.

  In the liquid crystal display device, an illumination device is provided on the front surface or the back surface of the liquid crystal panel. In particular, in a liquid crystal display device that performs transmissive display, a so-called backlight as an illuminating device is arranged on the back side of the liquid crystal panel (that is, the back side opposite to the observer). As the backlight, there are known a direct type in which a plurality of light sources are arranged directly under a liquid crystal panel, and a so-called edge light type in which a light source is arranged on an end surface of a light guide arranged on the back side of the liquid crystal panel.

  In any method, it is generally known that a cold cathode fluorescent tube is applied as a light source. However, in recent years, an illumination device using a light emitting diode containing no mercury as a light source has been developed from the viewpoint of environmental problems. ing.

  When a light emitting diode is used as a light source, a method of obtaining white light by using a white light emitting diode in which a blue light emitting diode and a yellow light emitting phosphor are combined, for example, red (R), green (G), and blue (B ) To obtain white light using monochromatic light emitting diodes of different emission colors. In the method using light emitting diodes of a plurality of colors, for example, a plurality of sets of a set of light emitting diodes composed of the three colors R, G, and B are arranged. In recent years, attention has been paid to a method using light emitting diodes of a plurality of colors because a rich color reproduction range can be expressed.

  For example, liquid crystal televisions that are applied to direct type backlights by combining a plurality of monochromatic light emitting diodes of a set of R, G, and B are mass-produced. As described above, in a backlight having a light emitting diode set of three primary colors, a light diffusing plate is provided for the purpose of obtaining uniform white light by mixing the light of each light emitting diode, and the light emitting diodes are equally spaced. It is trying to arrange with.

  On the other hand, in the case of an edge light type backlight, in order to obtain uniform white light by combining R, G, and B monochromatic light emitting diodes, the width of the light emitting diodes is about 3 mm per unit. It is necessary to arrange the light emitting diodes at a distance of 10 mm or more in consideration of the mounting interval. Therefore, it is necessary to devise in order to mix each monochromatic light uniformly. Therefore, for example, a method is known in which a color mixing area for mixing light incident on the light guide is provided separately from the display area. That is, in this system, in order to obtain uniform white light by combining R, G, and B single color light emitting diodes, a mixed color region for mixing emission colors and a display region where white light is formed are guided. Provided on the body.

Further, for example, Patent Document 1 discloses that only about half of the light emitted from the light emitting diode disposed at the side end of the light guide is incident on the light guide. Patent Document 2 describes that a light source is constituted by two light emitting element rows, and one row occupies all or most of at least one of the three main light emitting elements. Patent Document 3 discloses that a plurality of linear light sources are arranged side by side in the normal direction of the exit surface while the longitudinal direction thereof is parallel to the exit surface of the light guide. Patent Document 4 describes that light source cells arranged on the incident surface of the light guide are arranged so that red, green, and blue are aligned in a direction perpendicular to the emission surface of the light guide.
JP 2006-236951 A JP 2003-187622 A JP-A-2005-183124 JP 2005-326881 A

  As described above, when the color mixture region is provided with a predetermined width in the light guide, the light mixed in the color mixture region becomes substantially white in the display region. However, in the side portion extending in the direction intersecting the incident surface of the light guide, the color ratio of the light emitting diode disposed at the end is increased. For example, when the color of the outermost light emitting diode is red, there is a problem that white illumination cannot be obtained and the light is emitted as reddish light.

  In other words, the emission angle characteristic of the luminance of the light emitting diode is not uniform at any emission angle, the luminance of light emitted in the front direction is the highest, and the luminance increases as the angle from the front direction increases. Has come to decline.

  For example, when the light emitting diodes of the three primary colors R, G, and B are used for the backlight, in the area in front of the R light emitting diode, the light sources G and B on the right side of R and the G on the left side of R The light emitted from each of the light sources B and B in an oblique direction reaches the area in front of the R, and mixes with the light from the R light source, thereby obtaining white light.

  However, for example, the light of the light emitting diode arranged at the right end of the light guide is mixed by the light emitted obliquely from each light source arranged at the left of the light emitting diode at the end. Since no light source is arranged on the right side, the degree of color mixing is reduced. That is, in the end region of the light guide, the amount of light of a color other than the color of the light emitting diode at the end is reduced.

  Further, the light emitted in the right oblique direction from the rightmost light emitting diode is totally reflected on the right end surface of the light guide. Therefore, the light emitted from the rightmost end of the light guide contains an increasing amount of light of the color of the rightmost light emitting diode.

  Thus, there is a problem in that the color of the light emitting diode arranged at the end is colored at the side end of the light guide.

  The present invention has been made in view of such various points, and the object of the present invention is to suppress the coloring due to the color of the light emitting diode disposed on the side of the light guide and to sufficiently mix white It is in trying to get light.

  In order to achieve the above object, an illumination device according to the present invention is arranged in a light guide that diffuses and guides light incident from an incident surface, and is arranged in an arrangement direction along the incident surface of the light guide. A plurality of light emitting diodes, wherein the light colors of the plurality of light emitting diodes are a plurality of colors, and an interval between adjacent light emitting diodes at the end in the arrangement direction is the center in the arrangement direction. This is smaller than the interval between adjacent light emitting diodes.

  The illumination device according to the present invention includes a light guide that diffuses and guides light incident from an incident surface, and a plurality of light emitting diodes arranged in an arrangement direction along the incident surface of the light guide. The lighting device includes a plurality of light colors of the plurality of light emitting diodes, and a plurality of light emitting diodes including at least one or more different colors are incorporated at the end in the arrangement direction. The configured LED package is arranged, and the interval between adjacent light emitting diodes in the LED package is smaller than the interval between adjacent light emitting diodes in the central portion in the arrangement direction.

  It is preferable that the space | interval of the said adjacent light emitting diodes is gradually small as it goes to the sequence direction edge part from the sequence direction center part.

  The plurality of light emitting diodes preferably include a red light emitting diode, a green light emitting diode, and a blue light emitting diode.

  The liquid crystal display device according to the present invention is a liquid crystal display device including a liquid crystal display panel and an illumination device disposed to face the liquid crystal display panel, and the illumination device is incident from an incident surface. A light guide that diffuses and guides light; and a plurality of light emitting diodes arranged in an arrangement direction along an incident surface of the light guide, and the light colors of the plurality of light emitting diodes are a plurality of colors. The interval between the light emitting diodes adjacent to each other at the end portion in the arrangement direction is smaller than the interval between the light emitting diodes adjacent to each other at the center portion in the arrangement direction.

  The liquid crystal display device according to the present invention is a liquid crystal display device including a liquid crystal display panel and an illumination device disposed to face the liquid crystal display panel, and the illumination device is incident from an incident surface. A light guide that diffuses and guides light; and a plurality of light emitting diodes arranged in an arrangement direction along an incident surface of the light guide, and the light colors of the plurality of light emitting diodes are a plurality of colors. An LED package configured by incorporating a plurality of light emitting diodes including at least one or more different colors is disposed at the end in the arrangement direction, and an interval between adjacent light emitting diodes in the LED package is The distance between adjacent light emitting diodes in the central portion in the arrangement direction is smaller.

  It is preferable that the space | interval of the said adjacent light emitting diodes is gradually small as it goes to the sequence direction edge part from the sequence direction center part.

  The plurality of light emitting diodes preferably include a red light emitting diode, a green light emitting diode, and a blue light emitting diode.

-Action-
Next, the operation of the present invention will be described.

  In the lighting device, light emitted from the plurality of light emitting diodes is incident on the light guide from the incident surface of the light guide. The light incident on the light guide is diffused and mixed within the light guide because the light emitted from the plurality of light emitting diodes is composed of a plurality of colors. Thereafter, the light that has been mixed and diffused is emitted from the light guide.

  In the region of the light guide corresponding to the central portion of the light emitting diodes in the arrangement direction, a sufficient number of light emitting diodes are arranged on both the left and right sides, so even if the distance between adjacent light emitting diodes is relatively large, Light from each color light emitting diode is sufficiently mixed, and white light is obtained. In addition, by relatively increasing the distance between the light emitting diodes, the number of light emitting diodes can be reduced to reduce the device cost.

  On the other hand, in the region of the light guide that faces the end of the light emitting diode in the arrangement direction, the light emitting diode is not provided on the outer side, so that it is difficult for each light to be sufficiently mixed. On the other hand, in the present invention, since the interval between the adjacent light emitting diodes is relatively small at the end in the arrangement direction, the color mixing property of the light in the region of the light guide corresponding to the end in the arrangement direction. Will be improved. As a result, sufficiently colored white light is obtained by suppressing coloring due to the color of the light emitting diodes arranged in the region corresponding to the end portion in the arrangement direction of the light guide (that is, the side portion of the light guide). It becomes possible.

  By the way, when each of the plurality of light emitting diodes has the same size, a predetermined space is required for mounting each light emitting diode. Therefore, there is a limit to reducing the interval between adjacent light emitting diodes. Therefore, it is preferable to dispose an LED package configured by incorporating a plurality of light emitting diodes including at least one different color at the end in the arrangement direction. As a result, it is possible to improve the color mixing property by further reducing the distance between adjacent light emitting diodes in the LED package.

  Further, the number of light emitting diodes that contribute to color mixing of each light decreases from the center in the arrangement direction toward the end in the arrangement direction, and color mixing tends to be difficult. Therefore, if the distance between adjacent light emitting diodes is gradually reduced from the central part in the arrangement direction toward the end in the arrangement direction, the color mixing property of the light is also reduced along with the reduction in the distance between the light emitting diodes. It is gradually increased as it goes to the edge. As a result, white light with higher uniformity can be obtained.

  If the light emitting diode includes, for example, a red light emitting diode, a green light emitting diode, and a blue light emitting diode, a rich color reproduction range can be expressed by light of these colors.

  Moreover, in a liquid crystal display device provided with the said illuminating device, the white light formed as mentioned above from an illuminating device injects into a liquid crystal display panel in the state in which the color nonuniformity etc. were reduced. Thus, in the liquid crystal display panel, display quality is enhanced by white light with reduced color unevenness.

  According to the present invention, the interval between the adjacent light emitting diodes at the end portion in the arrangement direction of the light emitting diodes is made smaller than the interval between the adjacent light emitting diodes at the center portion in the arrangement direction. In the region of the light body, the color mixing property of light can be improved. As a result, it is possible to obtain sufficiently mixed white light while suppressing coloring due to the color of the light emitting diodes arranged on the side portions of the light guide.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiment.

Embodiment 1 of the Invention
1 and 2 show Embodiment 1 of the present invention. FIG. 1 is a plan view illustrating a main part of the illumination device 2 according to the first embodiment. FIG. 2 is a cross-sectional view showing a schematic structure of the liquid crystal display device 1.

  In the present embodiment, the observer side of the illumination device 2 (the front side in FIG. 1 and the upper side in FIG. 2) is referred to as the front side, while the opposite side to the observer of the illumination device 2 (the back of the page in FIG. 1). The lower side in FIG. 2 may be referred to as the back side.

  First, the liquid crystal display device 1 of Embodiment 1 will be described.

  As shown in FIG. 2, the liquid crystal display device 1 includes a liquid crystal display panel 13 and an illumination device 2 disposed to face the liquid crystal display panel 13. The illumination device 2 is also referred to as a backlight, and emits light toward the liquid crystal display panel 13. Thus, the liquid crystal display device 1 is configured as a transmissive liquid crystal display device that transmits light from the illumination device 2 and performs display.

  The structure of the liquid crystal display panel 13 is not specifically limited, A well-known liquid crystal display panel can be applied suitably. That is, although not illustrated, the liquid crystal display panel 13 includes, for example, an active matrix substrate on which a plurality of TFTs (thin film transistors) are formed and a CF substrate facing the active matrix substrate, and a liquid crystal layer is interposed between these substrates. It has the structure enclosed with the sealing material.

  Next, the lighting device 2 will be described.

  As shown in FIGS. 1 and 2, the lighting device 2 includes at least one light guide 14, a plurality of light emitting diodes 16R, 16G, and 16B that are light sources, a chassis 19 that accommodates these, and the light guide. 14 and an optical sheet 20 disposed on the front side of the optical disc 20.

  The light guide 14 is formed in a substantially rectangular plate shape, and is disposed such that the front surface and the back surface thereof face the front side and the back side, respectively. The side cross section of the light guide body 14 is formed in a wedge shape as shown in FIG. 2 and constitutes a so-called edge light type backlight.

  The left side surface of the light guide 14 in FIG. 2 constitutes an incident surface 14a on which light from the light emitting diodes 16R, 16G, and 16B is incident. Thus, the light guide 14 diffuses the light incident from the incident surface 14a and guides it to the right side in FIG.

  The shape and number of the light guides 14 are not particularly limited, and can be appropriately selected according to the size of the illumination target (for example, the liquid crystal display panel 13). Moreover, when using two or more light guides 14, it is preferable that each light guide 14 is mutually arrange | positioned in parallel. Furthermore, although the distance between each light guide 14 is not specifically limited at this time, it is preferable to arrange | position the adjacent light guide 14 without a clearance gap. Thereby, in the illuminating device 2, since the light radiate | emitted from each light guide 14 is uniformly distributed without a gap, the liquid crystal display panel 13 can be irradiated with the light with higher uniformity of brightness.

  The light guide 14 is made of a transparent resin such as PMMA or polycarbonate. The material of the light guide 14 is not limited to PMMA or polycarbonate, and any material can be applied as long as it is a transparent resin.

  The light guide 14 can be formed by, for example, injection molding, extrusion molding, hot press molding, cutting, or the like. However, it is not limited to these molding methods, and any processing method can be used as long as the same characteristics are exhibited.

  Then, as shown in FIG. 1, the light guide 14 is a color mixture region 21 provided in a region having a predetermined width from the incident surface 14a and a display other than the color mixture region 21 and contributing to display. Region 22. The mixed color region 21 is a region that mixes light of a plurality of colors of the light emitting diodes 16R, 16G, and 16B that has entered the light guide 14 from the incident surface 14a, and does not contribute to display. On the other hand, in the display area 22, the white light mixed in the mixed color area is diffused and guided. Thus, the white light is emitted from the emission surface, which is the front surface of the display region 22 in the light guide 14, to the liquid crystal display panel 13 side.

  The plurality of light emitting diodes 16R, 16G, and 16B are mounted on the front surface side of the substrate 17 installed in the chassis 19, and are arranged along the incident surface 14a of the light guide body 14 (direction orthogonal to the paper surface in FIG. 2). And arranged in the left-right direction in FIG. The plurality of light emitting diodes 16R, 16G, and 16B have a plurality of colors of light, and are configured by, for example, a red light emitting diode 16R, a green light emitting diode 16G, and a blue light emitting diode 16B. Further, the light colors of the adjacent light emitting diodes 16R, 16G, and 16B are arranged different from each other from the viewpoint of forming uniform white light. The plurality of light emitting diodes only need to include red (R), green (G), and blue (B), and may include other colors.

  The plurality of light emitting diodes 16R, 16G, and 16B are a set of three arrays arranged in the order of R, G, and B, and a plurality of sets of the light emitting diodes 16 are continuously provided. In addition, the combination of said light emitting diode and the order of arrangement | sequence are not limited to this. For example, from the viewpoint of the light emission efficiency of each light emitting diode, it is possible to use two Gs to form an array of R, G, G, B,.

  It is preferable that the light emitting diodes 16R, 16G, and 16B and the light guide body 14 are arranged as close as possible. By arranging the light emitting diodes 16R, 16G, and 16B and the light guide body 14 close to each other, the light incident efficiency from the light emitting diodes 16R, 16G, and 16B to the light guide body 14 is improved, and an efficient lighting device is obtained. be able to.

  A driver 18 for controlling the lighting of each of the light emitting diodes 16R, 16G, and 16B is mounted on the back side of the substrate 17 in the chassis 19. That is, the driver 18 is mounted on the same substrate 17 together with the light emitting diodes 16R, 16G, and 16B. By mounting on the same board, the number of boards can be reduced and the number of connectors connecting the boards can be reduced, so that the cost of the apparatus can be reduced. In addition, since the number of substrates is small, the lighting device can be thinned.

  The chassis 19 constitutes a concave casing opened upward, and the driver 18, the substrate 17, the light emitting diodes 16R, 16G, and 16B, the reflection sheet 15, and the light guide 14 are respectively contained therein. Contained.

  The optical sheet 20 is composed of a plurality of sheets arranged on the front surface side of the light guide 14, and uniformizes and collects the light emitted from the light guide 14 and irradiates the liquid crystal display panel 13. It is supposed to be.

  That is, the optical sheet 20 is a diffusion plate for irradiating the liquid crystal display panel 13 with uniform light, a diffusion sheet for condensing light while condensing it, or a lens sheet for concentrating light and improving the luminance in the front direction. Alternatively, a polarization reflection sheet that improves the luminance of the liquid crystal display device 1 by reflecting one polarization component of light and transmitting the other polarization component can be applied. These are used in an appropriate combination depending on the price and performance of the liquid crystal display device 1.

  The reflection sheet 15 is disposed over the entire back surface of the light guide 14 so that a part of the light emitted from the light guide 14 and the optical sheet 20 are reflected to the light guide 14 side. The reflected light is further reflected toward the liquid crystal display panel 13 side. When a plurality of light guides 14 are provided, a reflection sheet 15 may be provided for each light guide 14, and one reflection sheet formed integrally with each light guide 14. 15 may be provided.

  As a main feature of the present invention, as shown in FIG. 1, the interval A between the adjacent light emitting diodes 16R, 16G, and 16B at the ends in the arrangement direction of the light emitting diodes 16R, 16G, and 16B is the central portion in the arrangement direction. Are smaller than the interval B between the adjacent light emitting diodes 16R, 16G, and 16B. Further, as shown in FIG. 1, the interval between the adjacent light emitting diodes 16R, 16G, and 16B is gradually reduced from the center in the arrangement direction toward the end in the arrangement direction.

  The liquid crystal display device 1 including the illumination device 2 performs display as follows.

  In the illuminating device 2, light emitted from the plurality of light emitting diodes 16 </ b> R, 16 </ b> G, and 16 </ b> B is incident on the light guide 14 from the incident surface 14 a of the light guide 14. The light incident on the light guide 14 is diffused inside the light guide 14 and mixed with each other in the color mixture region 21 because the light colors of the adjacent light emitting diodes 16R, 16G, and 16B are different from each other. The Thereafter, the mixed white light is guided through the display region 22 while being diffused, and is emitted from the emission surface 14 b of the light guide 14 toward the liquid crystal display panel 13. On the other hand, the light emitted to the back side of the light guide 14 is reflected by the reflection sheet 15 and is incident on the light guide 14 again, and then is emitted from the emission surface 14b to the liquid crystal display panel 13 side.

  The white light emitted from the emission surface 14b of the light guide 14 passes through the optical sheet 20, the characteristic thereof is modulated, and the light is emitted as planar light. Here, “planar” refers to a state in which the light intensity in a plane parallel to the optical sheet 20 (that is, the diffusing plate, the diffusing sheet, the lens sheet, the polarization reflecting sheet, etc.) is substantially the same. Thus, the planar light emitted from the illumination device 2 is incident on the liquid crystal display panel 13. Thus, transmission of desired light is controlled for each of the plurality of pixels formed on the liquid crystal display panel 13, and desired display is performed.

-Effect of Embodiment 1-
Therefore, according to the first embodiment, the interval A between the adjacent light emitting diodes 16R, 16G, and 16B at the end portion in the arrangement direction is smaller than the interval B between the adjacent light emitting diodes 16R, 16G, and 16B in the central portion in the arrangement direction. Therefore, the color mixing property of the light can be improved in the color mixing region 21 of the light guide 14 corresponding to the end portion in the arrangement direction. As a result, it is possible to suppress the coloring due to the color of the light emitting diode 16R disposed on the side of the light guide body 14 and to obtain white light that is sufficiently mixed.

  That is, in the mixed color region 21 of the light guide 14 corresponding to the central portion in the arrangement direction of the light emitting diodes 16R, 16G, and 16B, a sufficient number of the light emitting diodes 16R, 16G, and 16B are arranged on the left and right sides. Even if the distance between the matching light emitting diodes 16R, 16G, and 16B is relatively large, the light of the light emitting diodes 16R, 16G, and 16B of the respective colors is sufficiently mixed, and desired white light can be obtained. Further, by relatively increasing the distance between the light emitting diodes 16R, 16G, and 16B, the number of the light emitting diodes 16R, 16G, and 16B can be reduced, thereby reducing the device cost.

  On the other hand, in the mixed color region 21 of the light guide 14 that faces the ends in the arrangement direction of the light emitting diodes 16R, 16G, and 16B, as shown in FIG. 1, the light emitting diodes 16R, 16G, and 16B are provided on the left and right sides of the outer side. It is difficult for each light to be sufficiently mixed. On the other hand, in the first embodiment, since the distance between the adjacent light emitting diodes 16R, 16G, and 16B is relatively small at the end in the arrangement direction, the color mixture of the light guides 14 corresponding to the end in the arrangement direction. In the region 21, the color mixing property of light can be improved. As a result, coloring by the colors of the light emitting diodes 16R, 16G, and 16B disposed in the color mixture region 21 corresponding to the end portion in the arrangement direction of the light guide 14 (that is, the left and right side portions of the light guide 14 in FIG. 1). Suppressing and sufficiently mixed white light can be obtained.

  Further, the number of light emitting diodes 16R, 16G, and 16B that contribute to color mixing of each light decreases from the center in the arrangement direction toward the end in the arrangement direction, and color mixing tends to be difficult. On the other hand, in the first embodiment, the interval between the adjacent light emitting diodes 16R, 16G, and 16B is gradually decreased from the central portion in the arrangement direction toward the end portion in the arrangement direction. , 16B, the color mixing property of light can be gradually increased toward the end in the arrangement direction. As a result, white light with higher uniformity can be obtained.

  Furthermore, since the light emitting diodes 16R, 16G, and 16B include, for example, a red light emitting diode 16R, a green light emitting diode G, and a blue light emitting diode B, a rich color reproduction range is expressed by light of these colors. be able to.

  In the liquid crystal display device 1 including the illumination device 2, the white light formed as described above from the illumination device can be incident on the liquid crystal display panel in a uniform state with reduced color unevenness and the like. become. As a result, the liquid crystal display panel 13 can improve display quality by white light with reduced color unevenness.

<< Embodiment 2 of the Invention >>
FIG. 3 shows a second embodiment of the present invention. FIG. 3 is a plan view showing a main part of the illumination device 2 according to the second embodiment. In the following embodiments, the same portions as those in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, the light emitting diodes 16R, 16G, and 16B having the same shape are arranged over substantially the entire incident surface 14a. In the second embodiment, the arrangement of the light emitting diodes 16R, 16G, and 16B is arranged. Instead of the set of light emitting diodes 16 at the end in the direction, LED packages 26 that are packaged light emitting diodes are provided.

  The LED package 26 is configured by incorporating a plurality of light emitting diodes including at least one or more different colors. In particular, in the second embodiment, a set of three light emitting diodes 16r, 16g, and 16b constitutes one LED package 26. As the LED package 26, for example, a three-color LED generally called a multichip package (for example, NSSM038A manufactured by Nichia Corporation) can be applied.

  In these LED packages, the interval A between the adjacent light emitting diodes 16r, 16g, 16b is smaller than the interval B between the adjacent light emitting diodes 16R, 16G, 16B in the central portion in the arrangement direction.

  Therefore, also in the second embodiment, the intervals between the adjacent light emitting diodes 16R, 16G, and 16B are gradually increased from the central portion in the arrangement direction to the end portion in the arrangement direction as shown by the intervals A, B, and C in FIG. (The interval A <the interval C <the interval B).

-Effect of Embodiment 2-
Therefore, also in the second embodiment, the interval A between the adjacent light emitting diodes 16R, 16G, and 16B at the end in the arrangement direction is smaller than the interval B between the adjacent light emitting diodes 16R, 16G, and 16B at the center in the arrangement direction. Therefore, similarly to the first embodiment, it is possible to improve the color mixing property of light and obtain white light that is sufficiently mixed.

  By the way, when the plurality of light emitting diodes 16R, 16G, and 16B are configured with the same size, a predetermined space is required for mounting the light emitting diodes 16R, 16G, and 16B. Therefore, there is a limit in reducing the interval between the adjacent light emitting diodes 16R, 16G, and 16B.

  On the other hand, in the second embodiment, the LED package 26 configured by incorporating the plurality of light emitting diodes 16r, 16g, and 16b is disposed at the end in the arrangement direction, and therefore, the LED packages 26 are adjacent to each other. By further reducing the distance between the light emitting diodes 16r, 16g, and 16b, the color mixing property can be further improved.

<< Other Embodiments >>
In the first and second embodiments, the interval between the adjacent light emitting diodes 16R, 16G, and 16B is gradually reduced from the center in the arrangement direction toward the end in the arrangement direction, but the present invention is not limited to this. The intervals between the light emitting diodes 16R, 16G, and 16B inside the light emitting diodes 16R, 16G, and 16B at the end portions in the arrangement direction where the intervals are reduced (that is, the center side in the arrangement direction) may be arranged at equal intervals. Even in this case, it is possible to promote the color mixture of the light on the left and right sides of the light guide 14 and obtain uniform white light.

  As described above, the present invention is useful for lighting devices and liquid crystal display devices, and is particularly suitable for obtaining sufficiently mixed white light.

FIG. 1 is a plan view showing a main part of the lighting apparatus according to the first embodiment. FIG. 2 is a cross-sectional view showing a schematic structure of the liquid crystal display device. FIG. 3 is a plan view showing a main part of the illumination device according to the second embodiment.

Explanation of symbols

A Distance between light emitting diodes at the end in the arrangement direction B Distance between light emitting diodes at the center in the arrangement direction 1 Liquid crystal display device 2 Illumination device 13 Liquid crystal display panel 14 Light guide 14a Incident surface 14b Emission surface 15 Reflective sheet 16 A set of light emitting diodes 16R, 16G, 16B Light-emitting diodes 16r, 16g, 16b Light-emitting diode 17 Substrate 18 Driver 19 Chassis 20 Optical sheet 21 Color mixing area 22 Display area 26 LED package

Claims (8)

A light guide that diffuses and guides light incident from the incident surface;
A lighting device comprising a plurality of light emitting diodes arranged in an arrangement direction along an incident surface of the light guide,
The light color of the plurality of light emitting diodes consists of a plurality of colors,
The light colors of the adjacent light emitting diodes are different from each other,
The lighting device characterized in that an interval between adjacent light emitting diodes at the end in the arrangement direction is smaller than an interval between adjacent light emitting diodes at the central portion in the arrangement direction. A light guide that diffuses and guides light incident from the incident surface;
A lighting device comprising a plurality of light emitting diodes arranged in an arrangement direction along an incident surface of the light guide,
The light color of the plurality of light emitting diodes consists of a plurality of colors,
At the end in the arrangement direction, an LED package configured by incorporating a plurality of light emitting diodes including at least one or more different colors is disposed,
In the LED package, an interval between adjacent light emitting diodes is smaller than an interval between adjacent light emitting diodes in the central portion in the arrangement direction. In claim 1 or 2,
The space between adjacent light emitting diodes is gradually reduced from the center in the arrangement direction toward the end in the arrangement direction. In claim 1 or 2,
The lighting device, wherein the plurality of light emitting diodes include a red light emitting diode, a green light emitting diode, and a blue light emitting diode. A liquid crystal display device comprising a liquid crystal display panel and an illumination device arranged to face the liquid crystal display panel,
The lighting device includes a light guide that diffuses and guides light incident from an incident surface, and a plurality of light emitting diodes arranged in an arrangement direction along the incident surface of the light guide,
The light color of the plurality of light emitting diodes consists of a plurality of colors,
The liquid crystal display device, wherein an interval between adjacent light emitting diodes at the end in the arrangement direction is smaller than an interval between adjacent light emitting diodes in the central portion in the arrangement direction. A liquid crystal display device comprising a liquid crystal display panel and an illumination device arranged to face the liquid crystal display panel,
The lighting device includes a light guide that diffuses and guides light incident from an incident surface, and a plurality of light emitting diodes arranged in an arrangement direction along the incident surface of the light guide,
The light color of the plurality of light emitting diodes consists of a plurality of colors,
At the end in the arrangement direction, an LED package configured by incorporating a plurality of light emitting diodes including at least one or more different colors is disposed,
The liquid crystal display device, wherein an interval between adjacent light emitting diodes in the LED package is smaller than an interval between adjacent light emitting diodes in the central portion in the arrangement direction. In claim 5 or 6,
2. The liquid crystal display device according to claim 1, wherein an interval between the adjacent light emitting diodes is gradually reduced from the central portion in the arrangement direction toward the end portion in the arrangement direction. In claim 5 or 6,
The liquid crystal display device, wherein the plurality of light emitting diodes include a red light emitting diode, a green light emitting diode, and a blue light emitting diode.

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