CN110888263A - Lighting device - Google Patents
Lighting device Download PDFInfo
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- CN110888263A CN110888263A CN201910833990.XA CN201910833990A CN110888263A CN 110888263 A CN110888263 A CN 110888263A CN 201910833990 A CN201910833990 A CN 201910833990A CN 110888263 A CN110888263 A CN 110888263A
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- Prior art keywords
- light
- light source
- region
- housing
- reflective sheet
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
Abstract
The invention provides an illumination device, which further inhibits the generation of uneven brightness caused by a light source of a backlight source. The lighting device (100) is provided with: a housing (10); a reflective sheet (11) disposed on the housing (10); a light guide plate (12) disposed on the reflective sheet (11); and a light source (20) that is provided in the case (10) so as to face the end face of the light guide plate (12). A reflective sheet (11) is provided with a notch (11a) in a region facing a light source (20), and the notch (11a) includes: a 1 st region (11a-1) having a width larger than a width of the light source (20); and a 2 nd region (11a-2) having a width equal to or less than the width of the light source (20) and formed in a direction away from the light source (20) as compared with the 1 st region (11 a-1). A light shielding tape (30) overlapping the cutout (11a) is disposed on the housing (10).
Description
Technical Field
The present invention relates to a lighting device.
Background
In recent years, liquid crystal display devices have been increasingly sophisticated and have a narrow frame. In particular, in the vehicle-mounted relationship, the intelligentization of the interior of the vehicle is progressing, and a narrow-bezel product with strict space requirements, such as a mobile product, is desired. Here, when the size of the bezel on the light incident side is only about 6mm to 7mm, for example, oblique light by the bezel becomes insufficient, and so-called luminance unevenness may be visually recognized when the liquid crystal display device is viewed obliquely.
Documents of the prior art
Patent document
Patent document 1: international publication No. 2016/194716
Disclosure of Invention
Therefore, an object of the present invention is to provide an illumination device capable of further suppressing the occurrence of luminance unevenness caused by a light source of a backlight.
The lighting device of the present invention includes: a housing; a reflective sheet disposed on the housing; a light guide plate disposed on the reflective sheet; and a light source provided in the case so as to face an end surface of the light guide plate, wherein a notch portion is provided in a region facing the light source on the reflective sheet, the notch portion including: a 1 st region having a width greater than a width of the light source; and a 2 nd region having a width equal to or less than the width of the light source and formed in a direction away from the light source than the 1 st region, wherein a light shielding tape overlapping the notch portion is disposed on the housing.
Effects of the invention
According to the present invention, it is possible to further suppress the occurrence of luminance unevenness caused by the light source of the backlight.
Drawings
Fig. 1 is a perspective view schematically showing a detailed configuration of the illumination device of the present embodiment.
Fig. 2 is a view schematically showing a cross section of a laminated structure of an illumination device according to an embodiment of the present invention.
Fig. 3 is a diagram for explaining the structure of the reflective sheet of the illumination device according to the embodiment of the present invention.
Fig. 4 is a diagram for explaining the structure of the notch portion.
Fig. 5 is a diagram for explaining a position where the notch portion is formed.
Fig. 6 is a diagram for explaining a method of arranging the light-shielding tape.
Fig. 7 is a diagram for explaining a method of preventing entry of foreign matter by disposing a light shielding tape.
Fig. 8 is a diagram for explaining the light diffusibility of the panel structure according to the embodiment of the present invention.
Description of the reference numerals
6: back light source
10: shell body
11: reflective sheet
11 a: notch part
11 a-1: region 1
11 a-2: region 2
12: light guide plate
13: diffusion sheet
14: 1 st prism sheet
15: 2 nd prism sheet
16: polarizing sheet
20: light source
30: shading belt
40: liquid crystal panel
51: TFT substrate (1 st substrate)
52: color filter substrate (No. 2 substrate)
53: no. 1 polarizing plate
55: 2 nd polarizing plate
70: stud part
71: stud hole part
100: lighting device
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment, and when there are a plurality of embodiments, the present invention also includes an embodiment in which the respective embodiments are combined.
Fig. 1 is a schematic perspective view showing a detailed configuration of a display device according to the present embodiment. In the following description, an XYZ rectangular coordinate system is set, and the positional relationship of each part will be described with reference to the XYZ rectangular coordinate system. The X, Y, and Z axes are orthogonal to each other. In the present disclosure, the X-axis direction corresponds to the "1 st direction", the Y-axis direction corresponds to the "2 nd direction", and the Z-axis direction corresponds to the "3 rd direction". In the present disclosure, an XY plan view of an XY plane including the X axis and the Y axis as viewed from the Z axis direction corresponds to a "plan view".
In the example shown in fig. 1, the illumination device 100 has two sides extending in the X-axis direction (1 st direction) and two sides extending in the Y-axis direction (2 nd direction). The illumination device 100 includes a liquid crystal panel 40 and a backlight 6 that illuminates the liquid crystal panel 40, and the liquid crystal panel 40 and the backlight 6 are stacked in the Z-axis direction (3 rd direction).
The illumination device 100 may have a rectangular shape in the XY plan view. In the present embodiment, the rectangle includes a rounded rectangle. That is, at the four corners, four corners are included in which the sides are not orthogonal but curved. For example, the shape may be rectangular in XY plan view, or at least 1 corner may have a curvature. The illumination device 100 may have a shape other than a rectangular shape in the XY plan view.
The liquid crystal panel 40 has a display region provided in parallel with the XY plane and a peripheral region provided on the outer periphery of the display region. The display area can be confirmed by the observer from the Z-axis direction (3 rd direction).
The backlight 6 irradiates light from the back surface of the liquid crystal panel 40 to at least the display region.
The backlight 6 may be a so-called edge-light type backlight as follows: the backlight includes a plurality of Light sources (for example, Light Emitting Diodes (LEDs) that emit white Light) arranged at one end or both ends in the X-axis direction (1 st direction) and the Y-axis direction (2 nd direction) with respect to a Light guide plate (not shown) provided at a position corresponding to the display region in the XY plan view. The backlight 6 may be a so-called direct backlight as follows: the backlight includes a light source (for example, an LED that emits white light) provided directly below the display region in an XY plan view. Further, power supply and a control signal to the light source of the backlight 6 are supplied from the liquid crystal panel 40.
The backlight 6 and the liquid crystal panel 40 are bonded by, for example, an adhesive tape. The Adhesive tape is preferably a light-transmitting double-sided Adhesive sheet (Optical Clear Adhesive, OCA).
As shown in fig. 1, the liquid crystal panel 40 includes a TFT substrate 51, a color filter substrate 52 disposed opposite to the TFT substrate 51, a 1 st polarizing plate 53, a 2 nd polarizing plate 55, a driver IC59, and an FPC (Flexible printed circuit) substrate 9.
In the example shown in fig. 1, the liquid crystal panel 40 includes a 2 nd polarizing plate 55, a TFT substrate 51, a color filter substrate 52, and a 1 st polarizing plate 53 stacked in this order from the backlight 6 side in the Z-axis direction (3 rd direction). In the present disclosure, the TFT substrate 51 corresponds to the "1 st substrate", and the color filter substrate 52 corresponds to the "2 nd substrate".
The color filter substrate 52 and the TFT substrate 51 are substrates made of light-transmitting glass or the like. The TFT substrate 51 has a Thin Film Transistor (TFT) element formed on a base. The color filter substrate 52 is provided with a color filter, a light-shielding layer, and the like. A liquid crystal layer is injected between the TFT substrate 51 and the color filter substrate 52.
The TFT substrate 51 has a larger area than the color filter substrate 52 in the XY plan view. The TFT substrate 51 and the color filter substrate 52 are bonded to each other in a state in which one side of the TFT substrate 51 extending in the X-axis direction (1 st direction) extends out from the color filter substrate 52. The TFT substrate 51 includes a plurality of pixel electrodes arranged in a matrix and a common electrode formed to be insulated from the pixel electrodes. The TFT substrate 51 is provided with wiring such as a pixel signal line for supplying a pixel signal to the pixel electrode via the TFT element, and a scanning signal line for driving each TFT element. Note that the common electrode may be provided on the color filter substrate 52 instead of the TFT substrate 51.
Specifically, in the example shown in fig. 1, the size of the TFT substrate 51 in the X-axis direction (1 st direction) is equal to the size of the color filter substrate 52 in the X-axis direction (1 st direction), and the size of the TFT substrate 51 in the Y-axis direction (2 nd direction) is larger than the size of the color filter substrate 52 in the X-axis direction (1 st direction).
As shown in fig. 1, two sides at both ends in the X-axis direction (1 st direction) of the TFT substrate 51 are overlapped with two sides at both ends in the X-axis direction (1 st direction) of the color filter substrate 52, respectively, and one side at one end in the Y-axis direction (2 nd direction) of the TFT substrate 51 is overlapped with one side at one end in the Y-axis direction (2 nd direction) of the color filter substrate 52. One side of the other end of the TFT substrate 51 in the Y axis direction (2 nd direction) is offset from one side of the other end of the color filter substrate 52 in the Y axis direction (2 nd direction) and bonded thereto.
In the region of the TFT substrate 51 other than the extension portion 51a extending from the color filter substrate 52 in the XY plan view, the TFT substrate 51 and the color filter substrate 52 overlap in the Z-axis direction (3 rd direction). Thus, the end face of the outer peripheral end of the liquid crystal panel 40 in the XY plan view coincides with the end face of the outer peripheral end of the TFT substrate 51 in the XY plan view.
The following describes the structure of the cross section of the panel structure of the illumination device of the present embodiment and the structure of the reflective sheet. Fig. 2 is a view schematically showing a cross section of a laminated structure of an illumination device according to an embodiment of the present invention. Fig. 3 is a diagram for explaining the structure of the reflective sheet of the illumination device according to the embodiment of the present invention.
As shown in fig. 2, the illumination device 100 includes a housing 10, a reflective sheet 11, a light guide plate 12, a diffusion sheet 13, a 1 st prism sheet 14, a 2 nd prism sheet 15, a polarization sheet 16, a light source 20, a light shielding tape 30, and a liquid crystal panel 40. Although the housing 10 is not shown in fig. 1, the housing 10 is also shown in fig. 2.
The housing 10 is a member constituting the outside of the lighting device 100. Each component constituting the illumination device 100 is disposed inside the housing 10. The material of the case 10 is not particularly limited, and can be formed of, for example, aluminum.
The reflective sheet 11 is disposed on the surface of the housing 10. The reflective sheet 11 reflects light leaking from the lower surface side of the light guide plate 12 and causes the light to be incident again on the light guide plate 12. The reflective sheet 11 may have a function of diffusing light, a function of scattering light, and the like in addition to a function of reflecting light. As the reflective sheet 11, a reflective sheet well known in the field of lighting devices can be used. Specifically, the reflective sheet 11 is, for example, an ESR (enhanced specular Reflector) sheet. The specific case is discussed later, but the reflective sheet 11 has a notch portion 11a in a region of the lower portion of the light source 20.
The light guide plate 12 internally diffuses light incident from an end surface in the front-rear direction facing the light source 20, and emits the diffused light from an upper emission surface. As the light guide plate 12, a light guide plate well known in the field of lighting devices can be used, and specifically, as the light guide plate 12, a transparent resin such as an acrylic resin or a polycarbonate resin is used.
The diffusion sheet 13 is a transmissive optical member disposed on the emission surface of the light guide plate 12. The diffusion sheet 13 diffuses light emitted from the light guide plate 12 to adjust optical characteristics of the light. Further, the diffusion sheet 13 can use, for example, a diffusion sheet well known in the field of lighting devices.
The 1 st prism sheet 14 is a transmissive optical member disposed on the diffusion sheet 13. The 1 st prism sheet 14 adjusts optical characteristics of light emitted from the emission surface of the light guide plate 12 and passing through the diffusion sheet 13. A prism structure having a triangular cross section, for example, is formed on the surface of the 1 st prism sheet 14.
The 2 nd prism sheet 15 is a transmissive optical member disposed on the 1 st prism sheet 14. The 2 nd prism sheet 15 adjusts optical characteristics of light that is emitted from the emission surface of the light guide plate 12 and passes through the diffusion sheet 13 and the 1 st prism sheet 14. A prism structure having a triangular cross section, for example, is preferably formed on the surface of the 2 nd prism sheet 15.
The 1 st prism sheet 14 and the 2 nd prism sheet 15 function as light collecting sheets. When the 1 st prism sheet 14 and the 2 nd prism sheet 15 have prism structures formed thereon, the prism structure of the 1 st prism sheet 14 is preferably orthogonal to the prism structure of the 2 nd prism sheet 15. This can improve the light condensing function. Further, the 1 st prism sheet 14 and the 2 nd prism sheet 15 can use, for example, prism sheets well known in the field of lighting devices.
The polarizing sheet 16 is an optical sheet that transmits only light polarized in a predetermined direction out of incident light. The polarizing sheet 16 can use a polarizing sheet well known in the field of illumination devices. Specifically, for example, a polycarbonate resin can be used for the polarizing sheet 16.
The Light sources 20 are provided in plurality at predetermined intervals in the X direction, and are, for example, Light emitting diodes (LCDs). The light source 20 irradiates light toward an end surface of the light guide plate 12 facing the light source 20.
The light shielding tape 30 is a tape made of a material having high light shielding properties and disposed in the housing 10 in a region below the light source 20. Here, in order to improve the effect of light-shielding property, the light-shielding tape 30 is preferably black, but is not limited thereto, and may be gray, for example. The light shielding tape 30 is disposed in a lower region of the light source 20, and therefore shields light leaking from the lower surface side of the light guide plate 12 and light emitted downward from the light source 20. The light shielding tape 30 need not be disposed on the entire surface of the housing 10, but may be disposed only in a region below the light source 20.
The liquid crystal panel 40 is disposed on the polarizing sheet 16. As described above, the liquid crystal panel 40 has a structure including the TFT substrate 51, the color filter substrate 52, and the liquid crystal layer interposed between the TFT substrate 51 and the color filter substrate 52.
Hereinafter, the reflective sheet 11, the light guide plate 12, the diffusion sheet 13, the 1 st prism sheet 14, the 2 nd prism sheet 15, the polarizing sheet 16, and the liquid crystal panel 40 may be collectively referred to as a panel structure. The structure of the panel structure is an example, and is not intended to limit the present invention.
The structure of the reflective sheet 11 of the illumination device 100 of the present embodiment will be described with reference to fig. 3. Fig. 3 is a diagram for explaining the structure of the reflective sheet 11 of the illumination device 100. In fig. 3, for the sake of simplicity of explanation, the components other than the housing 10, the reflective sheet 11, the light source 20, and the light shielding tape 30 are omitted. In addition, the number of light sources 20 shown in FIG. 3 is not intended to limit the present invention.
As shown in fig. 3, the reflective sheet 11 has a notch portion 11a in a region below the light source 20. In the present embodiment, the light-shielding tape 30 is disposed so as to be exposed from the cutout portion 11 a. In the present embodiment, the light shielding tape 30 has such a structure as described above, and thereby shields light leaking from the lower surface side of the light guide plate 12 and light emitted downward from the light source 20. The notch 11a has a convex shape having a wide width in the vicinity of the light source 20 and a narrow width in a region away from the light source 20. The cutout 11a and the adjacent cutout 11a are formed so as not to overlap each other.
The configuration of the notch 11a of the reflective sheet 11 will be described with reference to fig. 4. Fig. 4 is a diagram for explaining the configuration of the cutout portion 11 a.
As shown in fig. 4, the notch 11a has a convex shape, and has a 1 st region 11a-1 having a wide width and a 2 nd region 11a-2 having a narrow width.
The 1 st region 11a-1 preferably has a length L1 in the width direction longer than the length D in the width direction of the light source 20. For example, in the case where the width-directional length D of the light source 20 is 3mm, the width-directional length L1 of the 1 st region 11a-1 is 4 mm. Specifically, the length L1 in the width direction of the 1 st region 11a-1 may be set to a length such that the light-shielding tape 30 can absorb light that widens in the width direction out of the light emitted from the light source 20. The length L1 in the width direction of the 1 st region 11a-1 may be a length that does not overlap with the adjacent 1 st region 11 a-1.
The width-directional length L2 of the 2 nd region 11a-2 is equal to the width-directional length D of the light source 20. For example, in the case where the width-directional length D of the light source 20 is 3mm, the width-directional length L2 of the 2 nd region 11a-2 is 3 mm. The width-directional length L2 of the 2 nd region 11a-2 may be shorter than 3 mm. That is, the width-directional length L2 of the 2 nd region 11a-2 is preferably equal to or less than the width-directional length D of the light source 20.
By forming the notch 11a to include the 1 st region 11a-1 and the 2 nd region 11a-2, the area of the reflective sheet 11 to be cut out can be reduced as compared with a case where a notch having a square shape of 4mm × 4mm, for example, is formed. This can suppress a decrease in brightness due to the cut-off of the reflective sheet 11.
The length L3 of the cutout 11a in the traveling direction of the light emitted from the light source 20 is not particularly limited, but is 4mm, for example, when the length L1 of the 1 st region 11a-1 in the width direction is 4 mm. Specifically, the length L3 of the cutout 11a in the light traveling direction may be set to a length at which the light-shielding tape 30 can absorb light emitted downward in the light traveling direction of light among the light emitted from the light source 20. In this case, the length L3 of the cutout portion 11a in the light traveling direction can be determined based on, for example, the emission angle of the light emitted from the light source 20 and the distance from the light source 20 to the reflective sheet 11. In this case, the length of the 1 st region 11a-1 in the light traveling direction, for example, of the length L3, can be set to 1mm or more, and the remaining length can be set to the length of the 2 nd region 11 a-2. Further, as the length of the 2 nd region 11a-2 in the traveling direction of light is shortened, the loss of luminance becomes large. Therefore, the length of the 2 nd region 11a-2 in the light traveling direction may also be determined in consideration of the luminance of the lighting device 100 with respect to the length of the 2 nd region 11a-2 in the light traveling direction. The distance R1 from the tip of the light source 20 to the active region of the liquid crystal panel 40 shown in fig. 1 is, for example, 4.1 mm. The notch 11a is preferably formed in a region from the top end of the light source 20 to the active region of the liquid crystal panel 40.
The position where the cutout portion 11a is provided in the illumination device 100 will be described with reference to fig. 5. Fig. 5 is a diagram for explaining a position where the notch portion 11a is provided.
As shown in fig. 5, the light sources 20 are provided in plurality along the 1 st side 10A of the housing 10 and the 2 nd side 10B of the housing 10, and the 1 st side 10A and the 2 nd side 10B of the housing 10 are along the X direction. Here, the distance from the light source 20 provided on the 1 st side surface 10A to the active region of the liquid crystal panel 40 is different from the distance from the light source 20 provided on the 2 nd side surface 10B to the active region.
As described above, the distance R1 from the light source 20 provided on the 1 st side surface 10A to the active region is, for example, 4.1 mm. On the other hand, the distance R2 from the light source 20 provided on the 2 nd side surface 10B to the active region is, for example, 4.9 mm. In this case, the notch 11A may be provided only on the 1 st side surface 11A of the reflective sheet 11, and not on the 2 nd side surface 11B of the reflective sheet 11. This is because if the distance from the light source 20 to the active region is long, the light emitted from the light source 20 is sufficiently diffused, and thus, luminance unevenness does not occur. In other words, in the present embodiment, the notch 11a may be provided only on the side surface where the luminance unevenness occurs.
In the example shown in fig. 5, the light source 20 is provided on both the 1 st side surface 10A and the 2 nd side surface 10B of the housing 10, but this is an example and is not intended to limit the present invention. The light source 20 may be disposed on at least one of the 1 st side surface 10A and the 2 nd side surface 10B.
An example of a method of disposing the light-shielding tape 30 in the housing 10 will be described with reference to fig. 6 and 7. Fig. 6 is a diagram for explaining a method of disposing the light-shielding tape 30. Fig. 7 is a diagram for explaining another effect of the light-shielding tape 30.
As shown in fig. 6, the light-shielding tape 30 is attached along the 1 st side surface 10A of the housing 10. The light shielding tape 30 is attached along the 1 st side surface 10A of the housing 10 via, for example, an adhesive. The light-shielding tape 30 need not be provided on the entire inner surface of the housing 10, and may be attached to a region immediately below the light source 20. In this case, the light-shielding tape 30 is attached so as to cover the stud hole 71 of the stud (stud) portion 70. Note that, although the stud hole 71 is shown in fig. 7 for ease of understanding of the description, the stud hole 71 is actually covered with the light-shielding tape 30.
Fig. 7 shows a structure of the rear surface of the housing 10. As shown in fig. 7, a stud portion 70 corresponding to the stud hole portion 71 is provided on the back surface of the housing 10. The illumination device 100 of the present embodiment is attached to a desired portion of a user by screwing a stud pin into the stud portion 70, for example. In this case, foreign matter such as chips of the stud portion 70, which is generated when the stud pin is screwed into the stud portion 70, may enter the lighting device 100. In the present embodiment, since the stud hole 71 is covered with the light-shielding tape 30, the entry of foreign matter into the lighting device 100 is suppressed. In other words, the light blocking tape 30 prevents foreign matter from entering the lighting device 100.
The degree of light diffusion in the panel structure will be described with reference to fig. 8. Fig. 8 is a diagram for explaining the degree of light diffusion in the panel structure. In the present embodiment, the occurrence of luminance unevenness can be suppressed by adjusting the degree of diffusion of light in the panel structure in addition to the light-shielding tape 30 disposed in the housing 10.
The panel structure 60 has different diffusivities depending on the locations. Specifically, as shown in fig. 8, the panel structure 60 has a region a opposed to the light source 20 and a region B opposed to a region between the light source 20 and the adjacent light source 20. In this case, the degree of diffusion of light differs between the region a and the region B.
The light in the region a is less diffused than the light in the region B. Therefore, the diffusion of light in the area a that directly receives light emitted from the light source 20 is suppressed, and thus the luminance in the area a becomes low. In addition, since light is more diffused in the region B that does not directly receive light emitted from the light source 20, the luminance at the position of the region B becomes high. This embodiment can thereby make the degree of diffusion of light in the light guide plate 12 uniform, and thus can suppress luminance unevenness. The method of adjusting the diffusion degree of the region a and the region B is not particularly limited. For example, the diffusion degree of the region a and the diffusion degree of the region B may be adjusted by smoothing the surface of the light guide plate 12 in the region B than the surface of the light guide plate 12 in the region a. For example, the number of scattering particles in the region B inside the light guide plate 12 may be smaller than the number of scattering particles in the region a introduced into the light guide plate 12. In addition, the degree of diffusion of light in the region a and the degree of diffusion of light in the region B may be adjusted by adjusting the optical characteristics of each sheet in the region a and the optical characteristics of each sheet in the region B.
As described above, in the present embodiment, the reflective sheet 11 is provided with the cut-out 11a having the 1 st region 11a-1 and the 2 nd region 11a-2, and the light-shielding tape 30 is exposed from the cut-out 11 a. This embodiment can thereby suppress the occurrence of luminance unevenness and also suppress the loss of luminance.
In the present embodiment, the degree of diffusion of light in the panel structure 60 facing the region between the light source 20 and the light source 20 is greater than the degree of diffusion of light in the panel structure 60 facing the light source 20. This embodiment can further suppress the occurrence of luminance unevenness.
In the present embodiment, the light-shielding tape 30 is disposed so that the light-shielding tape 30 covers the stud hole 71 provided in the housing 10. This embodiment can thereby suppress the occurrence of luminance unevenness and prevent the intrusion of foreign matter into the display region of the illumination device 100.
The embodiments are not limited to the above. The components of the above-described embodiments include components that can be easily conceived by those skilled in the art, substantially the same components, and components within a so-called equivalent range. Various omissions, substitutions, and changes in the components can be made without departing from the spirit of the embodiments described above.
Claims (5)
1. An illumination device is characterized by comprising:
a housing;
a reflective sheet disposed on the housing;
a light guide plate disposed on the reflective sheet; and
a light source disposed opposite to an end surface of the light guide plate in the case,
a notch portion is provided in the reflective sheet in a region facing the light source, the notch portion including: a 1 st region having a width greater than a width of the light source; and a 2 nd region having a width equal to or less than the width of the light source and formed in a direction away from the light source compared with the 1 st region,
a light shielding tape overlapping the cutout portion is disposed on the housing.
2. The lighting device of claim 1,
in the panel configuration including the reflective sheet and the light guide plate, a degree of diffusion of light in a portion opposing an area between the light source and a light source adjacent to the light source is larger than a degree of diffusion of light in a portion opposing the light source.
3. The lighting device of claim 1,
the size of the notch is determined according to the emitting angle of the light emitted by the light source.
4. The lighting device of claim 2,
the size of the notch is determined according to the emitting angle of the light emitted by the light source.
5. A lighting device as recited in any one of claims 1-4,
the light-shielding tape is disposed so as to cover a stud hole portion provided in the housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018167928A JP2020042945A (en) | 2018-09-07 | 2018-09-07 | Luminaire |
| JP2018-167928 | 2018-09-07 |
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| Publication Number | Publication Date |
|---|---|
| CN110888263A true CN110888263A (en) | 2020-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910833990.XA Pending CN110888263A (en) | 2018-09-07 | 2019-09-04 | Lighting device |
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| CN (1) | CN110888263A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010176872A (en) * | 2009-01-27 | 2010-08-12 | Epson Imaging Devices Corp | Illumination unit, electro-optical device, and electronic apparatus |
| CN103175034A (en) * | 2013-03-26 | 2013-06-26 | 南京中电熊猫液晶显示科技有限公司 | Light-emitting diode (LED) backlight module |
| CN105242456A (en) * | 2015-10-27 | 2016-01-13 | 深圳市华星光电技术有限公司 | Light source assembly and backlight module |
| CN107272257A (en) * | 2016-04-01 | 2017-10-20 | 株式会社日本显示器 | Display device |
| US20180004042A1 (en) * | 2016-06-29 | 2018-01-04 | Amtran Technology Co., Ltd. | Backlight module |
| CN107850806A (en) * | 2015-06-01 | 2018-03-27 | 夏普株式会社 | Side light type backlight device and liquid crystal display device |
-
2018
- 2018-09-07 JP JP2018167928A patent/JP2020042945A/en active Pending
-
2019
- 2019-09-04 CN CN201910833990.XA patent/CN110888263A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010176872A (en) * | 2009-01-27 | 2010-08-12 | Epson Imaging Devices Corp | Illumination unit, electro-optical device, and electronic apparatus |
| CN103175034A (en) * | 2013-03-26 | 2013-06-26 | 南京中电熊猫液晶显示科技有限公司 | Light-emitting diode (LED) backlight module |
| CN107850806A (en) * | 2015-06-01 | 2018-03-27 | 夏普株式会社 | Side light type backlight device and liquid crystal display device |
| CN105242456A (en) * | 2015-10-27 | 2016-01-13 | 深圳市华星光电技术有限公司 | Light source assembly and backlight module |
| CN107272257A (en) * | 2016-04-01 | 2017-10-20 | 株式会社日本显示器 | Display device |
| US20180004042A1 (en) * | 2016-06-29 | 2018-01-04 | Amtran Technology Co., Ltd. | Backlight module |
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|---|---|
| JP2020042945A (en) | 2020-03-19 |
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