CN110579835A - Light guide plate capable of improving hot spot phenomenon and light emitting device - Google Patents
Light guide plate capable of improving hot spot phenomenon and light emitting device Download PDFInfo
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- CN110579835A CN110579835A CN201910954783.XA CN201910954783A CN110579835A CN 110579835 A CN110579835 A CN 110579835A CN 201910954783 A CN201910954783 A CN 201910954783A CN 110579835 A CN110579835 A CN 110579835A
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- light
- guide plate
- bright line
- light guide
- incident surface
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a light guide plate capable of improving hot spot phenomenon, wherein a light incident surface of the light guide plate is used for receiving side incident light rays from a plurality of light sources respectively having light spreading ranges, an upper surface and a lower surface of the light guide plate are respectively vertically adjacent to the light incident surface, and the upper surface or the lower surface extends for a distance towards the direction opposite to the light incident surface by taking the adjacent position of the upper surface or the lower surface with the light incident surface as a starting point to form a transition region. The light guide plate also comprises light-taking microstructure groups and bright line microstructure groups, wherein the light-taking microstructure groups are arranged in regions, which are not the transition regions, of the upper surface or the lower surface, the bright line microstructure groups are respectively arranged in the transition regions, and each bright line microstructure group is positioned between any two adjacent light spreading ranges and used for enabling light rays to enter from the light incident surface and then to be acted by the bright line microstructure groups to form a bright line light emergent state, so that the hot spot phenomenon of the regions adjacent to the light incident surface is improved. The light guide plate can be used as a light emitting device with indicative property by further matching with an information marking drawing.
Description
Technical Field
the present invention relates to the field of light guide plates, and more particularly, to a light guide plate and a light emitting device capable of improving hot spot phenomenon.
Background
Light guide plates are now widely used in various fields of light emitting devices due to their excellent optical characteristics. The light guide plate can enable light rays incident to the inside to form light outgoing on the surface of the plate body through a mode of destroying total reflection, and further provides a uniform surface light source with enough brightness. In the application of the display, the light guide plate can be used as an excellent light source to irradiate light to the display panel so as to display the picture, based on the fact that the display panel does not have the light emitting characteristic. In addition, some light-emitting devices that do not belong to electronic images use a light guide plate as a light source to illuminate the image.
However, when a point light source such as an LED is used as a light source for providing light into the light guide plate, the light guide plate is limited by the characteristics of the point light source, and a light emitting state with non-uniform brightness is formed near the light incident side receiving the light of the point light source, which is called Hot Spot phenomenon (Hot Spot) in the industry. The hot spot phenomenon has a great influence on the light emitting performance of the product, and even for some applications with large size specifications, the available light energy in other areas may be too weak, resulting in insufficient light emitting brightness.
For the hot spot phenomenon, various schemes are continuously proposed in the related arts to homogenize the light emitting state of the light incident side region of the light guide plate as much as possible, so that the light emitting of the light guide plate can maintain the uniform and uniform effect of each region, for example, by arranging a Lens Array (Lens Array) on the light incident surface, the light incident spread angle of the point light source incident to the light guide plate is enlarged, and the hot spot phenomenon is solved by homogenizing the light emitting of the light incident side region. However, these methods are ineffective in solving the hot spot phenomenon, and in order to adjust the light emission to be uniform, a lot of time must be consumed for design and test, and the disadvantages of difficult research and development, development time consumption, and the like are generated.
In view of this, in order to solve the application defects of the conventional light guide plate, a light guide plate and a light emitting device capable of improving the hot spot phenomenon are proposed in order to integrate the rich experiences accumulated in the related industries for many years.
disclosure of Invention
An objective of the present invention is to provide a light guide plate and a light emitting device capable of improving hot spot phenomenon, defining a brand-new and marketable standard, and solving the problem of uneven light emission due to brightness and darkness that plague the light guide plate for a long time by making the light guide plate have a bright line light emission state, thereby improving the overall light emitting performance.
in order to achieve the above objectives, the present invention provides a light guide plate and a light emitting device capable of improving hot spot phenomenon, configured with a plurality of light sources, wherein the light sources are disposed at intervals, and each of the light sources has a light spreading range, the light guide plate includes: a light incident surface configured to receive side-entering light rays from the light sources; an upper surface vertically adjacent to the light incident surface; a lower surface vertically adjacent to the light incident surface; the upper surface or the lower surface extends a distance towards the light incident surface by taking the adjacent position of the upper surface or the lower surface and the light incident surface as a starting point to form a transition region; a light-taking microstructure group which is arranged in the region of the upper surface or the lower surface which is not the transition region; and a plurality of bright line microstructure groups which are respectively arranged in the transition region, wherein each bright line microstructure group is positioned between any two adjacent light spreading ranges and used for enabling the light rays of the light sources to form a bright line light emergent state under the action of the bright line microstructure groups after entering from the light incident surface, thereby improving the hot spot phenomenon of the area adjacent to the light incident surface and enabling the application of a subsequent light guide plate to have better light emergent performance.
In another embodiment, a light emitting device for improving hot spot phenomenon includes: the lamp strip is provided with a plurality of light sources, wherein the light sources are arranged at intervals, and each light source has a light spreading range; a light guide plate, comprising: the light incident surface is used for receiving the side incident light rays from the light bar; an upper surface vertically adjacent to the light incident surface; a lower surface vertically adjacent to the light incident surface; the upper surface or the lower surface extends a distance towards the light incident surface by taking the adjacent position of the upper surface or the lower surface and the light incident surface as a starting point to form a transition region; a light-taking microstructure group which is arranged in the region of the upper surface or the lower surface which is not the transition region; the plurality of bright line microstructure groups are respectively arranged in the transition region, wherein each bright line microstructure group is positioned between any two adjacent light spreading ranges and used for enabling light rays of the light sources to form a bright line light emitting state under the action of the bright line microstructure groups after entering from the light incident surface, so that a hot spot phenomenon of a region adjacent to the light incident surface is improved; the first information mark drawing is arranged corresponding to the upper surface or the lower surface so as to illuminate the graph on the first information mark drawing when light rays emit light from the upper surface or the lower surface; the first protective cover is covered on the first information mark drawing; and the fixing piece is arranged on one side of the light bar, the light guide plate, the first information sign drawing and the first protective cover and shields the transition area of the light guide plate, so that the light bar, the light guide plate, the first information sign drawing and the first protective cover are mutually positioned and assembled. Therefore, the light emitting device can penetrate through the bright line light emitting state of the light guide plate, improve the hot spot phenomenon of uneven brightness, improve the overall light emitting efficiency, and have better display effect when watching the graph on the first information sign drawing, thereby providing a more excellent light emitting product with higher light emitting performance.
based on the foregoing two embodiments, further, in another embodiment, the length of the transition region is a, the arrangement pitch of the light sources is P, and satisfies the relation of 0.15 ≦ a/P ≦ 0.16, and under the relation, a product using the light guide plate can have a larger viewing area and a lower production cost.
In addition, in another embodiment, two ends of each bright line microstructure group extend into each light spreading range, and the layout region of each bright line microstructure group is in a strip shape and the extending direction is parallel to the long axis of the light incident surface, so that the formation of the bright lines is more reliable.
In order to improve the performance of the light guide plate applied to the light emitting device, in a following embodiment, it is disclosed that the light-extracting microstructure group is a plurality of non-circular-arc-shaped concave structures, so that the light-emitting direction and the normal line of the upper surface or the lower surface form an angle therebetween, and accordingly, a user can more easily view a pattern to be illuminated.
Regarding the application of the light emitting device, in one embodiment, the light emitting device further comprises a second information sign drawing and a second protective cover, the second information sign drawing and the second protective cover are fixed by the fixing member, and the second information sign drawing and the first information sign drawing are arranged oppositely to be illuminated by light emitted from the upper surface or the lower surface, so as to display a pattern on the second information sign drawing; the second protective cover is covered on the second information sign drawing to achieve the efficiency of double-sided light emitting.
In summary, the light guide plate and the light emitting device capable of improving the hot spot phenomenon disclosed by the invention establish a brand-new market-accepted standardization rule for light emitting products, and eliminate the phenomenon of uneven light emission in the light direction adjacent to the light incident side of the light guide plate by a bright line light emission mode. In other words, the present invention departs from the traditional design mode of pursuing light-emitting uniformity, and makes the light-incident side region of the light guide plate emit light in bright lines, thereby improving the hot spot phenomenon and providing a light guide plate and a light-emitting device product different from the past. Therefore, the light guide plate and the light emitting device applied by the light guide plate have excellent light emitting performance, so that a user can watch more comfortably without being influenced by the bright and dark staggered areas.
Drawings
Fig. 1 is a perspective view of a light guide plate and a light source according to a preferred embodiment of the invention.
FIG. 2 is a partial plan view of a light guide plate and a light source according to a preferred embodiment of the invention.
FIG. 3 is a diagram illustrating a distribution of light energy in a region near the light incident surface when the light guide plate of the preferred embodiment of the invention is applied.
Fig. 4 is a partial schematic view of a light-extracting microstructure of a light guide plate according to a preferred embodiment of the invention.
Fig. 5 is an exploded view of a light emitting device according to a preferred embodiment of the invention.
Fig. 6 is an exploded view of another embodiment of a light emitting device according to the present invention.
Description of the reference numerals
1 light guide plate
10 light incident surface
11 upper surface of the container
12 lower surface
13 light-extracting microstructure group
14 bright line microstructure group
2 light emitting device
20 lamp strip
200 light source
21 first information sign drawing
22 first protective cover
23 fixing piece
24 second information sign drawing
25 second protective cover
Length of transition region A
B spread the light range
P light source setting pitch
N normal to the upper or lower surface
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
The light-emitting homogenization design of the light guide plate is a main research and development direction of the light guide plate in the related industry, and related manufacturers strive to make the light guide plate present the same uniformity in each region of the light-emitting surface, so that the problem of brightness and dark regions in the region adjacent to the light-incident side is solved by averaging the light energy of the brightness and dark regions, that is, the light-emitting uniformity of the light-emitting areas and other regions of the light guide plate can be more consistent by the design concept of reducing the brightness of the brightness and improving the brightness of the dark regions and making the light-emitting brightness of the areas and the light-emitting brightness of the other regions of the light guide plate approximately uniform, in other words, the light-emitting effect of the light. However, this method is difficult in design, and after all, it is necessary to make the bright area darker and the dark area brighter, and to make the original area with a very large brightness difference reach almost the same brightness of the emitted light, so that the naked eye does not have a bright or dark visual perception. The first scheme is to arrange a lens array on the light incident side to increase the incident spread angle of the light source and further eliminate the dark area, but the dark area cannot be eliminated completely by the method, so that the visual bright and dark contrast is still obvious. The second scheme is to control the light emitting state through the mesh point arrangement mode, specifically, to reduce the number of mesh points in the positive light source region on the light guide plate, so that the light emitting intensity in the region is relatively weakened, and it is hopeful to eliminate the bright-dark contrast phenomenon. Only after actual measurement, hot spot phenomenon can not be improved, and arc-like bright and dark section difference appears in the area right in front of the light source. Then, the present inventors have made a further design concept to eliminate the technical means of homogenization by forming a visible bright line light emission in the area adjacent to the light incident side, and have proposed another improvement scheme, that is, a light guide plate and a light emitting device capable of improving the hot spot phenomenon, which will be described later.
Please refer to fig. 1 and fig. 2, which are a perspective view of a light guide plate and a light source and a partial plan view of the light guide plate and the light source according to a preferred embodiment of the invention. The light guide plate 1 capable of improving the hot spot phenomenon disclosed by the invention is used for matching a plurality of light sources 200, wherein the light sources 200 are arranged at intervals, and each light source 200 has a light spreading range B. The light guide plate 1 includes a light incident surface 10, an upper surface 11, a lower surface 12, a light-extracting microstructure group 13 and a plurality of bright line microstructure groups 14.
The light incident surface 10 is used for receiving lateral light rays from the light sources 200, and specifically, the light sources 200 are arranged in a light bar form to facilitate electrical connection and assembly. The upper surface 11 and the lower surface 12 are vertically adjacent to the light incident surface 10 and are disposed oppositely, wherein the upper surface 11 or the lower surface 12 extends a distance toward the light incident surface 10 from the position adjacent to the light incident surface 10 to form a transition region 15. The light-extracting microstructure group 13 is disposed in a region of the upper surface 11 or the lower surface 12 that is not the transition region 15, wherein the disposition density of the light-extracting microstructure group 13 can be gradually increased from the side adjacent to the light-incident surface 10 to the other side, so that the light emitted from the non-transition region 15 can be uniform. One embodiment of the light-extracting microstructures 13 may be concave dot structures, and are formed on the upper surface 11 or the lower surface 12 by, for example, stamping or laser. The bright line microstructure groups 14 are respectively arranged in the transition region 15, wherein each bright line microstructure group 14 is located between any two adjacent light spreading ranges B, so that light rays of the light source 200 enter from the light incident surface 10 and are subjected to the effect of the bright line microstructure groups 14 to form a bright line light emergent state, thereby improving a hot spot phenomenon in a region adjacent to the light incident surface 10. After light enters the light guide plate 1 from the light incident surface 10, a visually visible bright line state can be formed in the region near the light incident surface 10 under the action of the bright line microstructure groups 14, and the light guide plate 1 does not generate a light emitting phenomenon of bright-dark section difference around the bright line, so that the light guide plate 1 is in a specification form acceptable to the market when applied. In the present embodiment, the bright line microstructure group 14 and the light extraction microstructure group 13 are disposed on the upper surface 11 as an example, and the disposition state of the light extraction microstructure group 13 is only illustrated for illustrative purposes and does not represent an actual state. In addition, in compliance with the frame conditions or the light source type differences, in practical applications, a plurality of dot structures may be disposed in the transition region 15, and the disposing density of the dot structures is less than that of the bright line microstructure group 14, so as to increase the light energy taken by the light guide plate 1 in the area near the light incident side.
Furthermore, in order to make the bright lines more uniform after the light is emitted from the light guide plate 1 and make the bright lines in a continuous state, both ends of each bright line microstructure group 14 can extend into each light spreading range B, and the layout area of each bright line microstructure group 14 is in a strip shape and the extending direction is parallel to the long axis of the light incident surface 10. Therefore, the bright line effect of the light after being acted by the bright line microstructure groups 14 can be further improved, so that the light guide plate 1 can form continuous and uniform bright line light emission, and the influence of bright and dark areas on visual observation is eliminated.
in particular, please refer to fig. 3, which is a diagram illustrating a distribution of light energy in a region adjacent to a light incident surface when the light guide plate according to the preferred embodiment of the present invention is applied, wherein a light incident surface 10 is disposed on the right side of the plate in the diagram. One implementation state of the light guide plate 1 and the light source 200 may be that the length of the transition region 15 is a, the arrangement pitch of the light source 200 is P, and the relationship between a/P and a/15 is less than or equal to 0.16. When the application specification of the light guide plate 1 conforms to the relationship, the light guide plate has the advantages of larger viewing area and lower product cost, but the hot spot phenomenon generated is more serious. Specifically, based on the current market demand, in order to enlarge the viewing area, the length a of the transition area 15 is gradually shortened to relatively enlarge the viewing area, and on the other hand, considering the overall product cost, it is generally desirable to reduce the number of the light sources 200, but when the number of the light sources 200 is reduced, the arrangement pitch of the light sources 200 is increased, and the dark area is enlarged, so that the hot spot phenomenon is more serious. The light guide plate 1 structure of the present invention can effectively improve the problem of contrast between light and dark under the structural conditions of the short transition region 15 length a and the large light source 200 setting pitch P, for example, under the condition that the transition region 15 length a is about 1.8mm, the light source 200 setting pitch P is about 11.7mm, and the a/P is about 0.154, the light guide plate 1 can present a bright line light-emitting state (refer to fig. 3) through the effect of the bright line microstructure groups 14, and visually present a uniform light-emitting state as a whole, thereby eliminating the bad visual effect of an obvious dark region.
Please refer to fig. 4, which is a partial schematic view of the light-extracting microstructure of the light guide plate according to the preferred embodiment of the invention. According to the application requirement of the light guide plate 1, when the light guide plate 1 is applied to a light emitting device displaying some patterns, in order to facilitate a user to view images, patterns, characters, or the like to be illuminated by the light guide plate 1, the light-taking microstructure group 13 may be designed as a plurality of non-circular-arc-shaped recessed structures, so that the light-emitting direction and the normal N of the upper surface 11 or the lower surface 12 are clamped to form an angle. As shown in fig. 4, when the light-taking microstructure group 13 is a non-circular-arc-shaped concave structure, after light enters the light guide plate 1 from the light-entering surface 10, the refraction direction of the light can be changed through the light-taking microstructure group 13, so that the light is relatively deviated from the normal N direction of the upper surface 11 or the lower surface 12, and the main light-exiting direction of the light guide plate 1 is slightly deviated, therefore, when the light guide plate 1 is installed on a ceiling or placed close to the ground, the user can watch the light more clearly and brightly. The main light-emitting direction of the light guide plate 1 and the structural shape of the light-taking microstructure group 13 depicted in fig. 4 are only an example, and do not represent actual light, and the main light-emitting direction of the light guide plate 1 of the present invention is not limited to this state.
fig. 5 is an exploded view of a light emitting device according to a preferred embodiment of the present invention, and fig. 1 to 3 are also shown. The invention also discloses a light-emitting device 2 which can improve the hot spot phenomenon by applying the light guide plate, and the light-emitting device is convenient to read by referring to each other because the light-emitting device is identical to the structural components of the light guide plate 1 and marked by the same reference symbols. The light emitting device 2 includes a light bar 20, a light guide plate 1, a first information sign drawing 21, a first protective cover 22, and a fixing member 23. The light bar 20 has a plurality of light sources 200, wherein the light sources 200 are disposed at intervals, and each light source 200 has a light spreading range B. The light guide plate 1 includes a light incident surface 10, an upper surface 11, a lower surface 12, a light-extracting microstructure group 13, and a bright line microstructure group 14, wherein the light incident surface 10 is used for receiving lateral incident light from the light bar 20, the upper surface 11 and the lower surface 12 are disposed opposite to each other and vertically adjacent to the light incident surface 10, respectively, and the upper surface 11 or the lower surface 12 extends a distance toward the light incident surface 10 with the adjacent position to the light incident surface 10 as a starting point to form a transition region 15. The light-taking microstructure groups 13 are arranged in the regions of the upper surface 11 or the lower surface 12, which are not the transition region 15, the bright line microstructure groups 14 are respectively arranged in the transition region 15, and each bright line microstructure group 14 is positioned between any two adjacent light spreading ranges B, so that after light rays of the light source 200 enter from the light incident surface 10, a bright line light emergent state is formed under the action of the bright line microstructure groups 14, and the hot spot phenomenon of the region adjacent to the light incident surface 10 is improved. For further details of the technical features of the light guide plate 1, please refer to the foregoing paragraphs.
The first information label sheet 21 is disposed corresponding to the upper surface 11 or the lower surface 12 so as to illuminate the pattern on the first information label sheet 21 when light is emitted from the upper surface 11 or the lower surface 12. In the present embodiment, the first information sign drawing 21 is provided with the escape indication figure as an example, however, this is only an example, and the invention is not limited thereto.
the first protecting cover 22 is covered on the first information sign drawing 21 to achieve the protection effect, wherein the first protecting cover 22 can be made of transparent and hard materials such as acrylic and glass. The fixing member 23 is disposed on one side of the light bar 20, the light guide plate 1, the first information sign drawing 21 and the first protecting cover 22, and shields the transition region 15 of the light guide plate 1, so that the light bar 20, the light guide plate 1, the first information sign drawing 21 and the first protecting cover 22 are mutually positioned and assembled. The fixing member 23 may be a n-shaped structure and is disposed on the light incident surface 10 side of the light guide plate 1, such that the light bar 20 is located inside the fixing member 23, the light emitting direction of the light source 200 faces the light incident surface 10 of the light guide plate 1, and the edge of the fixing member 23 can shield the transition region 15. In mounting applications, the lighting device 2 may also be fixed to, for example, a ceiling, a wall, etc. by means of the fixing member 23. It should be noted that although the fixing element 23 can shield the transition region 15, the light-emitting state of the region for the light utilization state still affects the light-emitting state of other regions, which is not negligible due to the shielding of the frame, that is, the light-emitting state in the transition region 15 still affects the light-emitting state of other regions of the light guide plate 1 directly viewed by the user, so that the light-emitting adjusting structure required by the design needs to be further designed for the transition region 15.
Therefore, the light emitting device 2 can improve the light emitting phenomenon of the light guide plate 1 in the region adjacent to the light incident surface 10 by penetrating through the bright line microstructure group 14 of the light guide plate 1, so that uniform bright lines can be formed at the light incident surface without obvious bright and dark section differences, and the overall light emitting efficiency of the light emitting device 2 can be effectively improved. It is to be noted that the present invention defines a new light-emitting product specification, which overcomes the design concept of continuously pursuing the light-emitting uniformity of the entire light guide plate 1, and improves the uneven brightness in a manner that the area adjacent to the light-incident surface 10 is in a bright light-emitting state, thereby providing a new standardized product acceptable in the market.
Similarly, in order to make the bright lines more uniform and continuous and eliminate any strong bright-dark contrast, both ends of each bright line microstructure group 14 may extend into each light spreading range B, and the layout region of each bright line microstructure group 14 is in a strip shape and the extending direction is parallel to the long axis of the light incident surface 10. Therefore, after the light is adjusted by the bright line microstructure group 14 in the layout mode, an almost continuous bright line light-emitting state can be formed.
In addition, the scale condition of the light emitting device 2 may be that when the length of the transition region 15 is a and the light source setting pitch is P, the relation of 0.15 ≦ a/P ≦ 0.16 is satisfied. As described above, according to the market trend of the light guide plate 1 and the light emitting device 2, the light guide plate 1 of the present invention can be applied to the product models with the low transition region 15 having the length a and the high light source 200 having the pitch P, and for such application conditions that are more likely to cause the serious hot spot phenomenon, the light can be adjusted to form a bright line light-emitting state through the bright line microstructure group on the light guide plate 1, so as to improve the hot spot phenomenon of uneven brightness. For other related details, please refer to the above paragraphs.
Further, referring to fig. 4 in combination, in order to make the light emitting device 2 easier for the user to view the clear first information sign drawing 21, the main light emitting direction of the light emitting device 2 can be adjusted by the shape of the dots of the light emitting microstructure group 13, when the light emitting microstructure group 13 is a plurality of non-circular-arc-shaped concave structures, the light emitting direction and the normal N of the upper surface 11 or the lower surface 12 can form an angle therebetween, in other words, when the light emitting device 2 can be applied to practical applications, the user can slightly deviate the main light emitting direction from the viewing direction of the light emitting device 2, so that the pattern of the first information sign drawing 21 viewed by the user is clearer.
Please refer to fig. 6, which is an exploded view of another embodiment of the light emitting device of the present invention. The light-emitting device 2 can also be configured such that the light guide plate 1 emits light from both the upper surface 11 and the lower surface 12, in addition to the first information sign drawing 21 being provided with a single-sided light-emitting structure, and further includes a second information sign drawing 24 and a second protective cover 25. The second information sign drawing 24 and the second protection cover 25 are also fixed by the fixing member 23, and the second information sign drawing 24 is disposed opposite to the first information sign drawing 21 so as to be illuminated by light emitted from the upper surface 11 or the lower surface 12, thereby displaying a figure on the second information sign drawing 24. Here, the second information sign drawing 24 is also provided with an escape indication drawing, but in practical application, the first information sign drawing 21 and the second information sign drawing 24 may have different drawings. The second protective cover 25 covers the second information sign drawing 24 to protect the second information sign drawing 24. Similarly, the second protection cover 25 can be made of acrylic or glass, which has both light-transmitting and rigid protection. According to some requirements, the light emitting device 2 of the present invention can also be a product with double-sided light emission, and after the light emitting device 2 is installed, the light guide plate 1 therein can respectively illuminate the patterns on the first information sign drawing 21 and the second information sign drawing 24 for users to watch. The fixing member 23 may be a n-shaped structure as shown in fig. 5, or a frame structure as shown in fig. 6, the light bar 20 may be correspondingly disposed in the long side of the fixing member 23, the light guide plate 1, the first information sign drawing 21 and the second information sign drawing 24 are respectively disposed in the frame structure, and the first protective cover 22 and the second protective cover 25 may be designed to be slightly larger than the fixing member and directly cover the fixing member corresponding to the first information sign drawing 21 and the second information sign drawing 24.
in summary, the light guide plate and the light emitting device capable of improving the hot spot phenomenon disclosed by the invention establish a brand-new market-accepted standardization rule for light emitting products, and eliminate the phenomenon of uneven light emission in the light direction adjacent to the light incident side of the light guide plate by a bright line light emission mode. In other words, the present invention departs from the conventional design mode of pursuing the whole light emission to be visually uniform, and then the light-incident side region of the light guide plate is presented with bright light emission, thereby improving the hot spot phenomenon with bright-dark section difference and providing the light guide plate and the applied light-emitting device product specification different from the past light guide plate. Therefore, the light guide plate and the light emitting device applied by the light guide plate have excellent light emitting performance, so that a user can watch more comfortably without being influenced by the bright and dark staggered areas. Furthermore, aiming at part of application requirements, the light-taking micro-structure group can also be made into a non-circular arc-shaped concave structure, so that the main light-emitting direction of the light guide plate is not vertical to the upper surface or the lower surface and slightly deviates, and a user can observe a clearer and brighter pattern. In addition, the light guide plate has the advantages of larger visible area and lower product cost, and can improve the serious uneven brightness through the light emitting state of the bright line under the condition of the advantages.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. A light guide plate capable of improving hot spot phenomenon is characterized in that the light guide plate is used for matching a plurality of light sources, the light sources are arranged at intervals, each light source has a light spreading range, and the light guide plate comprises:
A light incident surface configured to receive side-entering light rays from the light sources;
An upper surface vertically adjacent to the light incident surface;
A lower surface vertically adjacent to the light incident surface; the upper surface or the lower surface extends a distance towards the light incident surface by taking the adjacent position of the upper surface or the lower surface and the light incident surface as a starting point to form a transition region;
a light-taking microstructure group which is arranged in the region of the upper surface or the lower surface which is not the transition region; and
And the plurality of bright line microstructure groups are respectively arranged in the transition region, wherein each bright line microstructure group is positioned between any two adjacent light spreading ranges, so that light rays of the light sources enter from the light incident surface and form a bright line light emergent state under the action of the bright line microstructure groups, and the hot spot phenomenon of the area adjacent to the light incident surface is improved.
2. The light guide plate according to claim 1, wherein the transition region has a length A, the light sources are disposed at a pitch P, and the relationship A/P is 0.15 ≦ 0.16.
3. the light guide plate according to claim 1, wherein both ends of each of the bright line microstructure groups extend into the light spreading range, and the layout region of each of the bright line microstructure groups is elongated and extends in a direction parallel to the long axis of the light incident surface.
4. The light guide plate according to claim 1, wherein the light-extracting microstructures are a plurality of non-arc-shaped concave structures, such that an angle is formed between a light-emitting direction and a normal of the upper surface or the lower surface.
5. A light emitting device capable of improving hot spot phenomenon, comprising:
the lamp strip is provided with a plurality of light sources, wherein the light sources are arranged at intervals, and each light source has a light spreading range;
A light guide plate, comprising:
The light incident surface is used for receiving the side incident light rays from the light bar;
An upper surface vertically adjacent to the light incident surface;
A lower surface vertically adjacent to the light incident surface; the upper surface or the lower surface extends a distance towards the light incident surface by taking the adjacent position of the upper surface or the lower surface and the light incident surface as a starting point to form a transition region;
a light-taking microstructure group which is arranged in the region of the upper surface or the lower surface which is not the transition region; and
The plurality of bright line microstructure groups are respectively arranged in the transition region, wherein each bright line microstructure group is positioned between any two adjacent light spreading ranges and used for enabling light rays of the light sources to form a bright line light emitting state under the action of the bright line microstructure groups after entering from the light incident surface, so that a hot spot phenomenon of a region adjacent to the light incident surface is improved;
The first information mark drawing is arranged corresponding to the upper surface or the lower surface so as to illuminate the graph on the first information mark drawing when light rays emit light from the upper surface or the lower surface;
The first protective cover is covered on the first information mark drawing; and
a mounting, locate one side of this lamp strip, this light guide plate, this first information sign drawing and this first protective cover, and shield this transition district of this light guide plate to make this lamp strip, this light guide plate, this first information sign drawing and this first protective cover fix a position the equipment each other.
6. The light-emitting device according to claim 5, wherein the transition region has a length A, the light sources are disposed at a pitch P, and the relationship A/P is less than or equal to 0.15 and less than or equal to 0.16.
7. The light-emitting device according to claim 5, wherein two ends of each of the bright line microstructure groups extend into the light spreading range, and the layout region of each of the bright line microstructure groups is elongated and extends in a direction parallel to the long axis of the light incident surface.
8. The light-emitting device according to claim 5, wherein the light-extracting microstructures are non-circular-arc-shaped recesses, such that an angle is formed between a light-emitting direction and a normal of the top surface or the bottom surface.
9. The light-emitting device for improving hot spot phenomenon as claimed in claim 5, further comprising a second information marking sheet and a second protective cover, wherein the second information marking sheet and the second protective cover are fixed by the fixing member, the second information marking sheet is disposed opposite to the first information marking sheet to be illuminated by the light emitted from the upper surface or the lower surface, thereby displaying the pattern on the second information marking sheet; the second protective cover is covered on the second information sign drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910954783.XA CN110579835A (en) | 2019-10-09 | 2019-10-09 | Light guide plate capable of improving hot spot phenomenon and light emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910954783.XA CN110579835A (en) | 2019-10-09 | 2019-10-09 | Light guide plate capable of improving hot spot phenomenon and light emitting device |
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| CN110579835A true CN110579835A (en) | 2019-12-17 |
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| CN201910954783.XA Pending CN110579835A (en) | 2019-10-09 | 2019-10-09 | Light guide plate capable of improving hot spot phenomenon and light emitting device |
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Application publication date: 20191217 |