CN215376015U - Planar lighting device - Google Patents
Planar lighting device Download PDFInfo
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- CN215376015U CN215376015U CN202121433060.4U CN202121433060U CN215376015U CN 215376015 U CN215376015 U CN 215376015U CN 202121433060 U CN202121433060 U CN 202121433060U CN 215376015 U CN215376015 U CN 215376015U
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- side wall
- frame
- bottom frame
- lighting device
- planar lighting
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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
- G02F1/133608—Direct backlight including particular frames or supporting means
Abstract
The utility model provides a planar lighting device which is not easy to separate the combination of a bottom frame and a top frame. The planar lighting device of the embodiment includes a bottom frame, a top frame, a convex portion, a hole portion, or a blind hole portion. The bottom frame has a bottom plate and a side wall erected on the periphery of the bottom plate. The top frame has a frame portion and a side wall erected on a periphery of the frame portion, and covers an opening side of the bottom frame. The convex portions are arranged at the end of the side wall of the bottom frame and at a part of the outer peripheral surface thereof along the thickness direction of the planar lighting device. The hole or the blind hole is provided in the side frame and the side wall of the top frame, respectively, corresponding to the convex portion, and the convex portion is fitted into the hole or the blind hole.
Description
Technical Field
The present invention relates to a planar lighting device.
Background
Planar lighting devices used as backlights of liquid crystal display devices and the like are known (see patent documents 1 to 3 and the like).
In general, a planar lighting device includes a case including a box-shaped bottom frame (base frame) and a top frame (housing frame) covering an opening side of the bottom frame and provided with an opening through which light is emitted. Further, the outer peripheral surface of the side wall of the bottom frame is provided with a plurality of convex portions (claw portions) which are fitted into holes provided at a plurality of portions on the inner peripheral surface of the side wall of the top frame, thereby coupling the bottom frame and the top frame.
Patent document 1: japanese patent laid-open publication No. 2016-224090
Patent document 2: japanese patent laid-open publication No. 2011-113962
Patent document 3: japanese laid-open patent publication No. 2015-18700
However, when the planar illumination device is increased in size along with the increase in size of the liquid crystal display device or the like, there are problems as follows: the coupling between the bottom frame and the top frame by the convex portions and the hole portions of the side walls is easily released, and the function as the planar lighting device cannot be maintained. In particular, in the rectangular planar lighting device, the long side is less rigid than the short side, and the convex portion provided on the long side is easily fitted into the hole. For example, if the long side of the case is about 800mm due to an increase in size of the in-vehicle backlight or the like, the side wall of the top frame on the long side is bent in a bow shape and is opened between the side wall and the side wall of the bottom frame, and the projection and the hole are easily fitted to each other.
SUMMERY OF THE UTILITY MODEL
The present invention has been made in view of the above circumstances, and an object thereof is to provide a planar lighting device in which the coupling between the bottom frame and the top frame is not easily disengaged.
In order to solve the above problem and achieve the object, a planar lighting device according to an aspect of the present invention includes a bottom frame, a top frame, a convex portion, a hole portion, or a blind hole portion. The bottom frame has a bottom plate portion and a side wall erected on a peripheral edge of the bottom plate portion. The top frame has a frame portion and a side wall erected on a peripheral edge of the frame portion, and covers an opening side of the bottom frame. The convex portions are arranged at the end of the side wall of the bottom frame and at a part of the outer peripheral surface thereof along the thickness direction of the planar lighting device. The hole or the blind hole is provided in the side wall and the side frame of the top frame so as to correspond to the convex portion, respectively, and the convex portion is fitted into the hole or the blind hole.
The group of the convex portion and the hole portion or the group of the convex portion and the blind hole portion may be provided in plural on a side in a longitudinal direction of the planar lighting device.
The set of the convex portions and the holes or the set of the convex portions and the blind holes may be provided in a larger number than other portions in a central portion of the side in the longitudinal direction.
The planar lighting device may further include: a convex portion provided in a part of an outer peripheral surface of a side wall of the bottom frame; and a hole or blind hole provided in the side wall of the top frame and into which the convex portion is fitted, and the tip of the side wall of the bottom frame and the corresponding portion of the frame portion of the top frame do not have a structure for fitting.
The convex portion at the end of the side wall of the bottom frame may be flush with the outer peripheral surface of the side wall of the bottom frame from the substantially flat end surface of the side wall of the bottom frame and extend in a rectangular shape in the thickness direction, the convex portion at the outer peripheral surface of the side wall of the bottom frame may be raised in a rectangular shape outward from the outer peripheral surface of the side wall of the bottom frame, and the height of the bottom frame may be increased by a predetermined width in the thickness direction on the bottom plate side and may be decreased by being inclined toward the end side of the side wall of the bottom frame.
The bottom frame and the top frame may have flat or curved main surfaces.
An optical element constituting an edge-light type planar lighting device or an optical element constituting a direct-type planar lighting device may be housed in a case formed by the bottom frame and the top frame.
The planar lighting device according to one aspect of the present invention can make the coupling between the bottom frame and the top frame less likely to be disengaged.
Drawings
Fig. 1 is a plan view of a planar lighting device according to an embodiment.
Fig. 2 is a perspective view of a flat planar lighting device.
Fig. 3 is an exploded perspective view of a main part of the flat planar lighting device.
Fig. 4 is a perspective view of a curved planar lighting device.
Fig. 5 is an exploded perspective view of a main part of the curved planar lighting device.
Fig. 6 is a partially enlarged perspective view of a separated state before the bottom frame and the top frame are fitted to each other.
Fig. 7 is a partial cross-sectional view of the bottom frame and the top frame in a state of being fitted to each other.
Fig. 8 is a partial cross-sectional view of a planar lighting device as a comparative example.
Description of the reference numerals
A planar lighting device; a connecting portion; a bottom frame; a floor portion; a side wall; 3c, 3d.. convex; a reflective sheet; a substrate; a light source; a light guide plate; a sheet-fixing frame; an optical sheet; 9. 9A-9 c. A top frame; a bezel portion; a sidewall; hole portions 10c, 10d.
Detailed Description
The planar lighting device according to the embodiment will be described below with reference to the drawings. The present invention is not limited to the embodiment. In addition, the relationship of the sizes of the respective elements in the drawings, the proportions of the respective elements, and the like may be different from those in reality. In some cases, the drawings include portions having different dimensional relationships and ratios. In principle, the same contents described in one embodiment and modification can be applied to other embodiments and modifications.
Fig. 1 is a plan view of a planar lighting device 1 according to an embodiment. The plan view of fig. 1 also serves as a plan view of a curved planar lighting device 1 described later. Fig. 2 is a perspective view of the flat planar lighting device 1. Fig. 3 is an exploded perspective view of a main part of the flat planar lighting device 1. For convenience, the longitudinal direction of the planar lighting device 1 is defined as the X-axis direction, the short-side direction is defined as the Y-axis direction, and the thickness direction is defined as the Z-axis direction.
Although the drawings show an example of application to the edge-light planar lighting device 1 including the light guide plate, it goes without saying that the present invention can also be applied to a direct-type planar lighting device in which light sources are two-dimensionally arranged along the emission surface. In a direct type planar lighting device, a housing is provided with: the light source device includes a substrate on which light sources are two-dimensionally arranged, a reflector disposed on an emission side of the substrate and having a reflection surface surrounding each light source from the periphery, and an optical sheet such as a lens sheet or a diffusion sheet disposed on the emission side of the reflector and having optical characteristics adjusted.
In fig. 1 to 3, the planar lighting device 1 is configured such that a reflection sheet 4, a light guide plate 7, and an optical sheet 9 are stacked in this order on a bottom frame 3 and a top frame 10 serves as a cover. In fig. 2 and 3, the main surfaces of the bottom frame 3 and the top frame 10 are flat. In fig. 3, a plurality of light sources for emitting light to the light incident side surface (the side surface on the long side on the near side in the figure) of the light guide plate 7 and a substrate on which these light sources are mounted are omitted, but the arrangement thereof will be shown by a cross-sectional view described later. In fig. 2 and 3, the connection portion 2 is a member in which one end is connected to an internal substrate and which is electrically connected to the outside.
The bottom frame 3 is made of, for example, metal, and is formed by die casting, sheet metal, or the like. The reflection sheet 4 is for reflecting light leaking from the light guide plate 7 to the bottom chassis 3 side and returning the light to the light guide plate 7 side. When the reflection characteristics are good by applying white paint or the like to the bottom plate surface of the bottom frame 3, the reflection sheet 4 may be omitted. The light guide plate 7 is made of a transparent resin such as polycarbonate or acrylic, and guides light incident from the light incident side surface on the long side to the entire surface thereof, and emits the light from one main surface (the upper main surface in the figure).
The optical sheet 9 is one or more optically effective sheets, and is a diffusion sheet, a prism sheet, a Brightness Enhancement Film (DBEF: Dual Brightness Enhancement Film), or the like. One end (the front side in the drawing) of the long side of the optical sheet 9 is fixed to, for example, one piece of the sheet fixing frame 8, which is bent in a substantially L-shaped cross section from an elongated plate, and the other piece of the sheet fixing frame 8 is fixed by being sandwiched between the side wall of the bottom frame 3 and the side wall of the top frame 10. The top frame 10 is formed of, for example, resin or the like.
Fig. 4 is a perspective view of the curved planar lighting device 1, and fig. 5 is an exploded perspective view of a main part of the curved planar lighting device 1. The top view is the same as fig. 1. In fig. 4 and 5, the bottom chassis 3, the reflective sheet 4, the light guide plate 7, the optical sheets 9A to 9C (corresponding to the optical sheets 9), and the top chassis 10 are the same as those in fig. 2 and 3 except that the main surfaces thereof are curved. The bottom frame 3 and the top frame 10 are formed in a state of being bent from the beginning, but the reflection sheet 4, the light guide plate 7, and the optical sheets 9A to 9C are not bent before assembly, are bent when being disposed on the bottom frame 3, and are fixed in a state of being pressed by the top frame 10.
Fig. 6 is a partially enlarged perspective view of a separated state before the bottom frame 3 and the top frame 10 are fitted to each other, and is a structure common to a flat type (fig. 1 to 3) and a curved type (fig. 1, 4, and 5). Fig. 7 is a partial cross-sectional view of the bottom frame 3 and the top frame 10 in a fitted state. The fitting portion is, for example, a portion where a black-short horizontal line indicating the hole portion exists on the long side of the frame portion of the top frame 10 in fig. 1 (the upper long side is 6 portions, and the lower long side is 7 portions). The number of the fitting portions is not limited to the illustrated number, and is provided on the side in the longitudinal direction of the frame portion of the planar lighting device 1. Fig. 6 and 7 show one of the fitting portions provided on the lower long side of fig. 1.
In fig. 4 showing the bent type, in order to increase the bonding strength of the central portion which is easily disconnected from the light entrance side (the front side in the drawing), a larger number of structures for fitting than other portions are provided in the central portion of the side in the longitudinal direction of the light entrance side (the front side in the drawing) (not strictly matching with fig. 1 in this point), but a larger number of structures for fitting than other portions are provided in the central portion of the side in the longitudinal direction of the terminal side (the back side in the drawing). Further, although the structure for fitting which restricts movement in the 2-axis direction described later is applied to the side in the longitudinal direction, the structure for fitting which restricts movement only in the 1-axis direction, which is the thickness direction of the planar lighting device 1, is applied to the side in the short-side direction, instead of restricting the 2-axis direction. This is in view of the workability of rework. In this case, the fitting structure for restricting the movement in the 2-axis directions may be provided in both the longitudinal direction and the short direction.
In fig. 6 and 7, the bottom frame 3 includes a bottom plate 3a and a side wall 3b erected on the periphery of the bottom plate 3a. The top frame 10 has a frame portion 10a and a side wall 10b standing on the periphery of the frame portion 10a, and covers the opening side of the bottom frame 3.
A projection 3c is provided at the end of the side wall 3b of the bottom frame 3, and a projection (claw) 3d is provided at a part of the outer peripheral surface of the side wall 3b. The convex portions 3c and 3d are arranged in line along the thickness direction (Z-axis direction) of the planar lighting device 1. The protruding portion 3c at the end extends in a rectangular shape in the thickness direction from the substantially flat end surface 3e of the side wall 3b of the bottom frame 3, coplanar with the outer peripheral surface of the side wall 3b. The convex portion 3d on the outer peripheral surface is raised in a rectangular shape from the outer peripheral surface of the side wall 3b toward the outside, and the height of a predetermined width in the thickness direction of the bottom plate portion 3a side is increased, and the height is decreased while being inclined toward the distal end side of the side wall 3b.
Further, hole portions 10c corresponding to the convex portions 3c of the bottom frame 3 are provided in the frame portion 10a of the top frame 10, and hole portions 10d corresponding to the convex portions 3d of the bottom frame 3 are provided in the side wall 10b of the top frame 10. Holes 10c and 10d are substantially rectangular with R-shaped corners. In the illustrated example, the holes 10c and 10d are through holes, but may be blind holes that are not closed on the side facing the convex portions 3c and 3d. Further, a step portion 10e is provided on the lower surface side of the frame portion 10a of the top frame 10 so as to partially face the end surface 3e of the side wall 3b of the bottom frame 3. In assembly, the convex portion 3c of the bottom frame 3 is fitted into the hole portion 10c of the top frame 10, and the convex portion 3d of the bottom frame 3 is fitted into the hole portion 10d of the top frame 10. The projection 3d of the bottom frame 3 is easily bored into the side wall 10b of the top frame 10 at the time of assembly due to its inclined shape, and is not easily detached from the hole 10d after fitting.
Further, the top frame 10 includes, on the lower surface side of the frame portion 10a, a convex portion 10f facing the vicinity of the end portion of the main surface of the light guide plate 7, and a step portion 10g continuing to the convex portion 10f and facing the end portion of the optical sheet 9(9A to 9C). Further, a substrate 5 on which a plurality of light sources 6 are arranged in the longitudinal direction is fixed to the inner surface of the side wall 3b of the bottom chassis 3, and the emission surface of the light source 6 faces the light incident side surface 7a of the light guide plate 7. Further, as the light source 6, a top view type LED or the like emitting light from the top surface side is illustrated as an example, but a side view type LED or the like emitting light from the side surface side may be used. In this case, the substrate 5 is disposed in parallel with the bottom plate portion 3a of the bottom frame 3.
In fig. 6 and 7, the side wall 10b of the top frame 10 is restricted from moving in the Y-axis direction by the engagement of the hole 10c and the projection 3c of the bottom frame 3, and the side wall 10b is prevented from being bent outward in a bow shape. Further, although the movement in the Z-axis direction is restricted by the engagement of the hole 10d and the projection 3d of the bottom frame 3 in the side wall 10b of the top frame 10, the movement in the Y-axis direction is restricted so that the side wall 10b of the top frame 10 is not bent outward in a bow shape, and therefore, the engagement of the hole 10d and the projection 3d is not easily released because the side wall 10b and the side wall 3b are not opened. As a result, the coupling of the bottom chassis 3 and the top chassis 10 is not easily released.
In particular, in the curved planar lighting device 1 shown in fig. 4 and 5, since the light guide plate 7 and the like inside are sandwiched by the coupling of the bottom frame 3 and the top frame 10 in a state of being curved from a flat state before assembly, a force is applied in a direction in which the coupling of the bottom frame 3 and the top frame 10 is to be released by the restoring force of the light guide plate 7 and the like, but the coupling is firmly coupled without being released by the above-described structure.
Fig. 8 is a partial cross-sectional view of a planar lighting device 1' as a comparative example. In fig. 8, no convex portion is provided at the end of the side wall 3b 'of the bottom frame 3', and no hole portion is provided in the frame portion 10a 'of the top frame 10'. The other structure is the same as fig. 6 and 7. In this case, the side wall 10b ' of the top frame 10 ' is restricted from moving in the Z-axis direction by the fitting of the hole 10d ' and the projection 3d ' of the bottom frame 3, but if the side wall 10b ' is bent outward as shown by the broken line, the space between the side wall 10b ' and the side wall 3b ' is opened, and the fitting of the hole 10d ' and the projection 3d ' is easily released. In this regard, in the embodiment of fig. 6 and 7, the movement is restricted not only in the Z-axis direction but also in the Y-axis direction, and therefore, the fitting disengagement is prevented.
While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit and scope of the utility model.
As described above, the planar lighting device according to the embodiment includes: a bottom frame having a bottom plate portion and a side wall erected on a periphery of the bottom plate portion; a top frame having a frame portion and a sidewall erected on a periphery of the frame portion, and covering an opening side of the bottom frame; convex portions arranged in a row along a thickness direction of the planar lighting device at a distal end and a part of an outer peripheral surface of the side wall of the bottom frame; and a hole or blind hole provided in the side wall and the side frame of the top frame so as to correspond to the projection, respectively, and into which the projection is fitted. This makes it possible to prevent the bottom frame and the top frame from being easily separated from each other.
The group of the convex portions and the hole portions or the blind hole portions is provided in plural on the side in the longitudinal direction of the planar lighting device. This ensures the required strength of the bond.
The number of the convex portions, the holes, or the blind holes is larger than that of the other portions in the central portion of the side in the longitudinal direction. This can increase the bonding strength of the central portion from which the bonding is easily released, and particularly can secure a bending type bonding strength.
Further, the planar lighting device is provided with, on a side in the short side direction: a convex part arranged on the outer peripheral surface of the side wall of the bottom frame; and a hole or blind hole provided in the side wall of the top frame and into which the convex portion is fitted, and the end of the side wall of the bottom frame and the corresponding portion of the frame portion of the top frame do not have a structure for fitting. Thus, the portion that does not require bonding strength does not require a complicated structure for fitting, and the manufacturing, assembly, and rework operations can be facilitated.
The convex portion of the end of the side wall of the bottom frame extends in a rectangular shape in the thickness direction from the substantially flat end surface of the side wall of the bottom frame, and the convex portion of the outer peripheral surface of the side wall of the bottom frame rises in a rectangular shape toward the outside from the outer peripheral surface of the side wall of the bottom frame. Thereby, a specific shape of the convex portion and the hole portion or the blind hole portion can be provided.
The bottom frame and the top frame have flat main surfaces or are curved. This can expand the applicable planar lighting device and particularly improve the curved coupling force which is easily disengaged.
In addition, an optical element constituting an edge-light type planar lighting device or an optical element constituting a direct type planar lighting device is housed in a case formed by the bottom frame and the top frame. This can expand the applicable planar lighting device.
The present invention is not limited to the above embodiments. The present invention also encompasses an embodiment in which the above-described respective technical features are combined as appropriate. Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the above-described embodiments, and various modifications are possible.
Claims (10)
1. A planar lighting device is characterized by comprising:
a bottom frame having a bottom plate portion and a side wall erected on a peripheral edge of the bottom plate portion;
a top frame having a frame portion and a side wall erected on a periphery of the frame portion, and covering an opening side of the bottom frame;
convex portions arranged in a row along a thickness direction of the planar lighting device at a distal end and a part of an outer peripheral surface of the side wall of the bottom frame; and
and a hole or a blind hole provided in the side wall and the side frame of the top frame so as to correspond to the convex portion, respectively, and into which the convex portion is fitted.
2. The planar lighting device according to claim 1,
the group of the convex portions and the holes or the group of the convex portions and the blind holes is provided in plural on the side in the longitudinal direction of the planar lighting device.
3. The planar lighting device according to claim 2,
the number of the set of the convex portions and the holes or the set of the convex portions and the blind holes is larger than that of the other portions in the central portion of the side in the longitudinal direction.
4. The planar lighting device according to claim 2 or 3,
the planar lighting device is provided with:
a convex portion provided in a part of an outer peripheral surface of a side wall of the bottom frame; and
a hole portion or a blind hole portion provided in a side wall of the top frame and into which the convex portion is fitted,
the distal end of the side wall of the bottom frame and the corresponding portion of the frame portion of the top frame do not have a structure for fitting.
5. The planar lighting device according to any one of claims 1 to 3,
the convex portion at the end of the side wall of the bottom frame extends in a rectangular shape in the thickness direction from the substantially flat end surface of the side wall of the bottom frame to be coplanar with the outer peripheral surface of the side wall of the bottom frame,
the convex portion on the outer peripheral surface of the side wall of the bottom frame is raised in a rectangular shape from the outer peripheral surface of the side wall of the bottom frame toward the outside, and the height of the bottom frame in the thickness direction of the bottom plate portion side is increased by a predetermined width and is inclined toward the distal end side of the side wall of the bottom frame so as to be decreased.
6. The planar lighting device according to claim 4,
the convex portion at the end of the side wall of the bottom frame extends in a rectangular shape in the thickness direction from the substantially flat end surface of the side wall of the bottom frame to be coplanar with the outer peripheral surface of the side wall of the bottom frame,
the convex portion on the outer peripheral surface of the side wall of the bottom frame is raised in a rectangular shape from the outer peripheral surface of the side wall of the bottom frame toward the outside, and the height of the bottom frame in the thickness direction of the bottom plate portion side is increased by a predetermined width and is inclined toward the distal end side of the side wall of the bottom frame so as to be decreased.
7. The planar lighting device according to any one of claims 1 to 3,
the bottom frame and the top frame have flat main surfaces or are curved.
8. The planar lighting device according to claim 4,
the bottom frame and the top frame have flat main surfaces or are curved.
9. The planar lighting device according to claim 5,
the bottom frame and the top frame have flat main surfaces or are curved.
10. The planar lighting device according to any one of claims 1 to 3,
an optical element constituting an edge-light type planar lighting device or an optical element constituting a direct type planar lighting device is housed in a case formed by the bottom frame and the top frame.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020111184A JP7132978B2 (en) | 2020-06-29 | 2020-06-29 | Planar lighting device |
| JP2020-111184 | 2020-06-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215376015U true CN215376015U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110715880.0A Pending CN113934051A (en) | 2020-06-29 | 2021-06-25 | Planar lighting device |
| CN202121433060.4U Active CN215376015U (en) | 2020-06-29 | 2021-06-25 | Planar lighting device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110715880.0A Pending CN113934051A (en) | 2020-06-29 | 2021-06-25 | Planar lighting device |
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| Country | Link |
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| JP (1) | JP7132978B2 (en) |
| CN (2) | CN113934051A (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4543655B2 (en) | 2003-10-17 | 2010-09-15 | ソニー株式会社 | Liquid crystal display |
| JP2007157465A (en) | 2005-12-05 | 2007-06-21 | Radiant Opt-Electronics Corp | Fixing device of frame for backlight |
| JP5369664B2 (en) | 2008-12-19 | 2013-12-18 | 日亜化学工業株式会社 | Backlight unit |
| JP6986981B2 (en) | 2018-01-22 | 2021-12-22 | 三菱電機株式会社 | Backlight and display device |
-
2020
- 2020-06-29 JP JP2020111184A patent/JP7132978B2/en active Active
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2021
- 2021-06-25 CN CN202110715880.0A patent/CN113934051A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113934051A (en) | 2022-01-14 |
| JP2022010538A (en) | 2022-01-17 |
| JP7132978B2 (en) | 2022-09-07 |
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