TW202113439A - Light guide plate and lighting device of improving hot spot phenomenon - Google Patents

Abstract

A light guide plate and lighting device for improving hot spot phenomenon are disclosed. A light incident surface of the light guide plate is provided to receive the side light of a plurality of light sources which have a range of light emitting angle respectively. A top surface of the light guide plate and a bottom surface of the light guide plate are vertically adjacent to the light incident surface respectively. The top surface or the bottom surface starts from a position adjacent to the light incident surface, and extends in a distance away from the direction of the light incident surface to form a transition zone. The light guide plate also includes a light receiving microstructure group and a plurality of bright line microstructure group. The light receiving microstructure group is disposed in an area where is not in the transition zone of top surface or the bottom surface. The bright line microstructure groups are respectively arranged in the transition zone, and each bright line microstructure group is located between any adjacent light emitting angle ranges, so that the light can enter the light incident surface and the light is modified by the bright line microstructure group to form a bright line light-emitting state, thereby improving the hot spot phenomenon adjacent to the light incident. The light guide plate can be further used as an indicator light-emitting device with the pictogram.

Description

Light guide plate and light emitting device capable of improving hot spot phenomenon

The present invention is related to the field of light guide plates, and particularly relates to a light guide plate and a light emitting device that can improve hot spots.

With its excellent optical properties, the light guide plate has been widely used in various light-emitting device fields. The light guide plate can transmit the light incident to the interior by destroying the total reflection so that it can form light on the surface of the plate, thereby providing a uniform and sufficiently bright surface light source. Light guide plates are often used in displays and lamps to achieve the effects of displaying pictures and lighting. In display applications, based on the lack of light-emitting characteristics of the display panel itself, the light guide plate can be used as an excellent light source to illuminate the light. To the display panel to display the screen. In addition, some light-emitting devices that are not electronic images use light guide plates as the light source to illuminate the effect and purpose of displaying the desired image.

However, for light guide plates used in various fields, when a point light source such as LED is used as a source of light entering the light guide plate, it is limited by the characteristics of the point light source. The uniform light output state is what the industry refers to as a hot spot phenomenon (Hot Spot). The hot spot phenomenon will have a significant impact on the light taste of the product, and even for some large-size applications, it may cause the available light energy in other areas to be too weak, resulting in insufficient light brightness.

Regarding the hot spot phenomenon, the relevant industries continue to put forward various solutions to homogenize the light output state of the light-incident side area of the light guide plate as much as possible, so that the light output of the light guide plate can maintain the uniform and uniform effect of each area, for example, through the incident light The lens array (Lens Array) is arranged on the surface to expand the angle of light incident from the point light source to the light guide plate, and to solve the hot spot phenomenon by making the light out of the light incident side area uniform. However, these methods are not effective in solving hot spots, and in order to adjust the light emission to make it uniform, it takes a lot of time to design and test, resulting in the disadvantages of difficult research and development and time-consuming development.

In view of this, the inventor of the present invention has accumulated rich experience accumulated in related industries for many years and proposed a light guide plate and light emitting device that can improve the hot spot phenomenon, so as to solve the lack of application of the existing light guide plate.

One purpose of the present invention is to provide a light guide plate and a light emitting device that can improve hot spots, which defines a new commercial standard that can be accepted by the market, and solves the problem of the light guide plate by enabling the light guide plate to have a bright line of light state. The long-term uneven light emission phenomenon improves the overall luminous taste.

To achieve the above objective, in one embodiment of the present invention, a light guide plate and a light emitting device that can improve the hot spot phenomenon are provided, provided with a plurality of light sources, wherein the light sources are arranged at intervals, and each of the light sources has a spreading range , The light guide plate includes: a light incident surface for receiving side-entry light from the light sources; an upper surface perpendicularly adjacent to the light incident surface; a lower surface perpendicularly adjacent to the light incident surface; wherein, the The upper surface or the lower surface starts from the point adjacent to the light-incident surface, and extends a distance relative to the light-incident surface to form a transition zone; a group of light extraction microstructures is arranged on the upper surface or the lower surface. Is the region of the transition zone; and a plurality of bright line microstructure groups are respectively arranged in the transition zone, wherein each of the bright line microstructure groups is located between any two adjacent light spreading ranges to make After the light from the light sources enters the light-incident surface, the bright-line microstructure groups form a bright-line light-emitting state, thereby improving the hot spot phenomenon adjacent to the light-incident surface area, so that the subsequent light guide plate application has more Good taste of Idemitsu.

The present invention also discloses in one embodiment a light emitting device that can improve the hot spot phenomenon, including: a light bar 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, Including: a light incident surface for receiving the side-entry light from the light bar; an upper surface perpendicularly adjacent to the light incident surface; a lower surface perpendicularly adjacent to the light incident surface; wherein, the upper surface or the light incident surface The lower surface starts from the point adjacent to the light-incident surface and extends a certain distance in the direction relative to the light-incident surface to form a transition zone; a group of light extraction microstructures is arranged on the upper surface or the lower surface is not the transition zone In the area; a plurality of bright line microstructure groups are respectively arranged in the transition area, wherein each of the bright line microstructure groups is located between any two adjacent the spreading range, used to make the light of the light source After entering from the light-incident surface, the bright-line microstructure groups form a bright-line light-emitting state, thereby improving the hot spot phenomenon adjacent to the light-incident surface; a first information sign drawing corresponding to the upper surface or the The lower surface is arranged to illuminate the graphics on the first information sign drawing when light is emitted from the upper surface or the lower surface; a first protective cover is arranged on the first information sign drawing; and a fixing 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, and the first protective cover An information sign drawing and the first protective cover are positioned and assembled with each other. According to this, the light-emitting device can be allowed to pass through the bright line of the light guide plate, improve the hot spot phenomenon of uneven brightness, and improve the overall light-emitting efficiency, so that when viewing the graphics on the first information sign drawing, it can have better Display effect, and provide more excellent luminous products with high luminous taste.

Based on the foregoing two embodiments, further, in another embodiment, the length of the transition zone is A, and the distance between the light sources is P, and the relationship is 0.15≦A/P≦0.16. Under the conditions, the products using light guide plate can have a larger visible area and low production cost.

In addition, in yet another embodiment, the two ends of each bright line microstructure group extend into each of the light spreading ranges, and the arrangement area of each bright line microstructure group is elongated and the extension direction is the same as the The long axis of the light incident surface is parallel, so that the formation of the bright line is more reliable.

In order to improve the performance of the light guide plate applied to the light emitting device, it is disclosed in the next embodiment that the light extraction microstructure group is a plurality of non-arc-shaped recessed structures, so that the light direction of the light is in line with the upper The normal line of the surface or the lower surface forms an angle, so that the user can more easily see the pattern to be illuminated.

Regarding the application of the light-emitting device, one embodiment discloses that the light-emitting device further includes a second information sign drawing and a second protective cover, and the second information sign drawing and the second protective cover are fixed by the fixing member , The second information sign drawing is arranged opposite to the first information sign drawing, so as to be illuminated by the light from the upper surface or the lower surface, and then display the graphics on the second information sign drawing; the second protection The cover is arranged on the second information sign drawing to achieve the effect of emitting light on both sides.

In summary, the light guide plate and light-emitting device disclosed in the present invention that can improve hot spots have established a new standardized rule for light-emitting products that can be accepted by the market, and use bright line light to eliminate the light on the light-incident side of the adjacent light guide plate. The phenomenon of uneven light emission in the dark. In other words, the present invention breaks away from the traditional design method of pursuing uniform light output, and turns the light guide plate near the light entrance side area to appear as bright lines, thereby improving the hot spot phenomenon and providing light guide plates that are different from the previous light guide plates and the applied light. Device product. Accordingly, the light guide plate and the light-emitting device applied thereto can have excellent light-emitting taste, allowing users to watch more comfortably without being affected by the bright and dark interlaced areas.

The light uniformization design of the light guide plate is the main research and development direction of the light guide plate in the relevant industry. The relevant manufacturers strive to make the light guide plate show the same uniformity in each area of the light exit surface, so it looks like the light and dark areas adjacent to the light entrance side. In the past, the area problem was solved by averaging the light energy in the bright and dark areas, that is, through the design concept of reducing the brightness of the bright area, increasing the brightness of the dark area, and making the brightness of the two light approximately the same, so that the area adjacent to the light entrance side The light output from other areas of the light guide plate can have a more consistent light output uniformity. In other words, the light output of the light guide plate does not produce obvious bright or dark vision effects. However, this method is quite difficult in design. After all, it is not only necessary to darken the bright area and brighten the dark area, but also to make the area with the original brightness difference to achieve almost the same brightness, so that the naked eye does not have the brightness. Or dark vision. When facing the problem of the hot spot phenomenon of the light guide plate, the inventors initially designed the brightness averaging direction to reduce the brightness of the bright area and increase the brightness of the dark area. The first solution is to install a lens array on the light incident side to improve The incident spread angle of the light source eliminates the dark area, but this method still cannot completely eliminate the dark area, resulting in a visually obvious contrast between bright and dark. The second solution is to control the light output state through the dot layout method. The specific method is to reduce the number of dots in the area on the light guide plate facing the light source, so that the light intensity in this area is relatively weak, and it is hoped that the bright and dark contrast can be eliminated accordingly. However, after the actual measurement, the hot spot phenomenon could not be improved, and a similar arc-shaped difference between bright and dark segments appeared in the area directly in front of the light source. Then, the inventors went the other way, adopted another design concept, used the adjacent light-incident side area to form a visible bright line to emit light, eliminating the technical means of homogenization, and proposed another improvement plan, that is, the follow-up plan. The light guide plate and light-emitting device that can improve the hot spot phenomenon are described.

Please refer to FIGS. 1 and 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 a light source according to a preferred embodiment of the present invention. The light guide plate 1 that can improve the hot spot phenomenon disclosed in the present invention is provided with 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 extraction microstructure group 13 and a plurality of bright line microstructure groups 14.

The light incident surface 10 is used to receive side-entry light from the light source 200. Specifically, the light sources 200 are arranged in the form of a light bar to facilitate electrical connection and assembly. The upper surface 11 and the lower surface 12 are respectively perpendicularly adjacent to the light incident surface 10 and are oppositely arranged, wherein the upper surface 11 or the lower surface 12 starts from the point where it is adjacent to the light incident surface 10 and faces the opposite light incident surface 10 Extend a distance to form a transition zone 15. The light-trapping microstructure group 13 is arranged on the upper surface 11 or the lower surface 12, which is not the transition zone 15, and the arrangement density of the light-trapping microstructure group 13 can gradually increase from the side adjacent to the light incident surface 10 to the other side. So that the light in the non-transition zone 15 can achieve a uniform effect. An implementation state of the light extraction microstructure group 13 can be a recessed point-like structure, which is formed on the upper surface 11 or the lower surface 12 by means such as embossing or laser. The bright line microstructure groups 14 are respectively arranged in the transition zone 15, wherein each bright line microstructure group 14 is located between any two adjacent light spreading ranges B, so that the light from the light source 200 enters from the light incident surface 10 , By the action of the bright line microstructure group 14 to form a bright line light emitting state, thereby improving the hot spot phenomenon in the area adjacent to the light incident surface 10. When light enters the light guide plate 1 from the light incident surface 10, due to the effect of the iso-bright line microstructure group 14, a visually visible bright line state can be formed in the area near the light incident surface 10, and the light guide plate 1 can be brightened. There will be no light emission phenomenon with the difference between bright and dark segments on the side of the line, so that the light guide plate 1 presents a specification that can be accepted by the market when it is used. Among them, in this embodiment, the arrangement of the bright line microstructure group 14 and the light extraction microstructure group 13 on the upper surface 11 is taken as an example, and the arrangement state of the light extraction microstructure group 13 depicted in the figure is only for illustrative purposes. Use, non to indicate the actual state. In addition, due to the difference of some frame conditions or the types of light sources, in practical applications, some dot structures can also be arranged in the transition zone 15, and the arrangement density of these dot structures is less than that of the bright line microstructure group 14, so as to improve the light guide plate 1 close to The light energy taken in the area on the light incident side.

Further, in order to make the bright lines appearing after the light guide plate 1 emits light more uniform, and to make the bright lines in a continuous state, the two ends of each bright line microstructure group 14 can be extended into each light spreading range B, and The arrangement area of each bright line microstructure group 14 is elongated and the extension direction is parallel to the long axis of the light incident surface 10. Accordingly, it is possible to further enhance the bright line effect of light after the bright line microstructure group 14 acts, so that the light guide plate 1 can form a continuous and uniform bright line light output, and eliminate the visual effect of the bright and dark areas. influences.

For specific applications, please refer to Fig. 3 together, which is a diagram of the light energy distribution near the light incident surface area when the light guide plate is used in the preferred embodiment of the present invention. The right side of the plate in the figure is the light incident surface 10. The intersecting lines are not a light but a representation of the spreading range. An implementation state of the combination of the light guide plate 1 and the light source 200 may be that the length of the transition zone 15 is A, and the arrangement pitch of the light source 200 is P, and the relational expression of 0.15≦A/P≦0.16 is met. When the application specification of the light guide plate 1 conforms to this relational expression, it has the advantages of a larger viewing area and lower product cost, but the hot spot phenomenon will be relatively more serious. Specifically, based on current market demand, in order to allow the viewing area to expand, the current transition zone 15 length A is gradually shortened to relatively increase the viewing area. On the other hand, considering the overall product cost, it is generally also It is desirable to reduce the number of light sources 200 used. However, when the number of light sources 200 is reduced, the distance between each light source 200 increases, and the area of the dark area will expand accordingly, making the hot spot phenomenon more serious. Through the structure of the light guide plate 1 of the present invention, the problem of bright and dark contrast caused by the structure of the short transition zone 15 length A and the large light source 200 arrangement spacing P can be effectively improved. For example, the length A of the transition zone 15 is about When the light source 200 is set to a distance P of about 11.7mm, and the A/P is about 0.154, the bright line microstructure group 14 can make the light guide plate 1 present a bright line light emitting state ( (Refer to Figure 3), visually, the whole system presents a uniform light-emitting state, and the obvious dark area is eliminated for poor visual viewing.

Please continue to refer to FIG. 4, which is a partial schematic diagram of the light guide plate and the light extraction microstructure of the preferred embodiment of the present invention. Depending on the application requirements of the light guide plate 1, when the light guide plate 1 is used in a light-emitting device that displays some patterns, in order to facilitate the user to view the image, pattern or text that the light guide plate 1 wants to illuminate, the light-trapping microstructure group 13 series It can be designed as a plurality of non-arc-shaped recessed structures, so that the direction of the light emitted from the light and the normal line N of the upper surface 11 or the lower surface 12 form an angle. As shown in Figure 4, when the light extraction microstructure group 13 is a non-arc concave structure, the light enters the light guide plate 1 from the light incident surface 10, and the light refraction direction can be changed through the light extraction microstructure group 13 , Make it more deviate from the normal N direction of the upper surface 11 or the lower surface 12, and make the main light emission direction of the light guide plate 1 slightly deviate. According to this, when the light guide plate 1 is installed on the ceiling or placed When the application is close to the ground, it can make the user's viewing more clear and brighter. Among them, the main light-emitting direction of the light guide plate 1 and the structure shape of the light-trapping microstructure group 13 drawn in Fig. 4 are only an example, not representing actual light, and the main light-emitting direction of the light guide plate 1 of the present invention is not limited to this. status.

Please continue to refer to FIG. 5, which is an exploded schematic diagram of the structure of the light-emitting device according to the preferred embodiment of the present invention, and please refer to FIGS. 1 to 3 together. The present invention also discloses a light-emitting device 2 using the above-mentioned light guide plate to improve the hot spot phenomenon. Here, the structural elements of the above-mentioned light guide plate 1 are marked with the same component symbols to facilitate cross-reference reading. The aforementioned 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 arranged at intervals, and each light source 200 has a spreading range B. The light guide plate 1 includes a light incident surface 10, an upper surface 11, a lower surface 12, a light extraction microstructure group 13 and a bright line microstructure group 14. The light incident surface 10 is for receiving side-entry light from the light bar 20, and the upper surface The upper surface 11 and the lower surface 12 are arranged oppositely and vertically adjacent to the light incident surface 10 respectively, and the upper surface 11 or the lower surface 12 starts from the point where it is adjacent to the light incident surface 10 and extends a certain distance in the direction opposite to the light incident surface 10 to form a transition zone 15. The light extraction microstructure groups 13 are arranged in the upper surface 11 or the lower surface 12 which is not the transition zone 15, the bright line microstructure groups 14 are respectively arranged in the transition zone 15, and each bright line microstructure group 14 is located in any two phases In the adjacent light spreading range B, after the light of the light source 200 enters the light incident surface 10, it is affected by the bright line microstructure group 14 to form a bright line light emitting state, thereby improving the hot spot phenomenon in the area adjacent to the light incident surface 10. For further detailed technical features of the light guide plate 1, please refer to the foregoing paragraphs for the combination.

The first information sign drawing 21 is provided corresponding to the upper surface 11 or the lower surface 12 so as to illuminate the graphics on the first information sign drawing 21 when light is emitted from the upper surface 11 or the lower surface 12. In this embodiment, the first information sign drawing 21 has an escape instruction graphic as an example, but this is only an example, and the present invention is not limited to this.

The first protective cover 22 is arranged on the first information sign drawing 21 to achieve protection performance. The first protective cover 22 may be a transparent and hard material such as acrylic or glass. The fixing member 23 is arranged on one side of the light bar 20, the light guide plate 1, the first information sign drawing 21, and the first protective cover 22, and shields the transition area 15 of the light guide plate 1, so that the light bar 20, the light guide plate 1, the first The information sign drawing 21 and the first protective cover 22 are positioned and assembled with each other. The fixing member 23 can be a U-shaped structure and is arranged on the light-incident surface 10 side of the light guide plate 1, so that the light bar 20 is located inside the fixing member 23, and the light emitting direction of the light source 200 is toward the light guide plate 1. The light incident surface 10 and the edge of the fixing member 23 can shield the transition area 15. In installation applications, the light-emitting device 2 can also be fixed to places such as ceilings, walls, etc. by the fixing member 23. It should be noted that although the fixing member 23 can shield the transition area 15, the light utilization state of this area will still affect the light output state of other subsequent areas, which can be ignored unless it is shielded by the frame, that is, the transition area 15 The light-emitting state still affects the light-emitting state of other areas of the light guide plate 1 directly viewed by the user. Therefore, the transition area 15 still needs to be designed with the required light-emitting adjustment structure.

According to this, the light emitting device 2 penetrates the bright line microstructure group 14 of the light guide plate 1, so that the light emission phenomenon of the obvious bright and dark areas of the light guide plate 1 adjacent to the light incident surface 10 can be improved, so that uniform bright lines are formed there. There is no obvious difference between bright and dark segments, and the overall light-emitting efficiency of the light-emitting device 2 is effectively improved. To reiterate here, the present invention defines a brand-new luminous product specification, which escapes the design concept of the constant pursuit of homogenization of the light output of the light guide plate 1 in the past, but to make the area adjacent to the light incident surface 10 present a bright line of light. Ways to improve the uneven brightness and darkness, and provide new standardized products that can be accepted by the market.

Similarly, in order to make the appearance of bright lines more uniform and continuous, and eliminate any relatively strong contrast between bright and dark, the two ends of each bright line microstructure group 14 can be extended to each spread light range B, and each bright line microstructure The arrangement area of the cluster 14 is elongated and the extending direction is parallel to the long axis of the light incident surface 10. Thereby, after the light is adjusted in accordance with the bright line microstructure group 14 in the layout state, a nearly continuous bright line light emission state can be formed.

In addition, the ruler condition of the aforementioned light-emitting device 2 can also be that the length of the transition zone 15 is A, and the distance between the light sources is P, the relationship is 0.15≦A/P≦0.16. As mentioned above, in response to the current market trend for the application 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 product models with a low transition zone 15 length A and a high light source 200 with a pitch P. This is more likely to cause The application conditions for serious hot spot phenomenon, through the bright line microstructure group on the light guide plate 1, can adjust the light to form the bright line light state and improve the hot spot phenomenon of uneven brightness. For the rest of the detailed technical content, please refer to the foregoing paragraphs for the combination.

Further, please refer to Figure 4 for the combination. In order to make the light-emitting device 2 easier for the user to see the clear first information sign drawing 21, the main light-emitting direction of the light-emitting device 2 can be determined by the dots of the light extraction microstructure group 13 The shape is adjusted. When the light-trapping microstructure group 13 is a plurality of non-arc-shaped recessed structures, the light direction of the light can be interposed with the normal line N of the upper surface 11 or the lower surface 12 to form an angle, in other words, That is to say, the light emitting device 2 can slightly offset the main light emission direction according to the viewing direction of the user relative to the light emitting device 2 in actual application, so that the user can see the pattern of the first information sign drawing 21 more clearly and brightly. .

Please continue to refer to FIG. 6, which is an exploded schematic diagram of the structure of another implementation state of the light-emitting device of the preferred embodiment. The light emitting device 2 is not only provided with the first information sign drawing 21 to emit light from one side, but also allows the light guide plate 1 to emit light from the upper surface 11 and the lower surface 12 at the same time, and further includes a second information sign drawing 24 and A second protective cover 25. The second information sign drawing 24 and the second protective cover 25 are also fixed by the fixing member 23, and the second information sign drawing 24 is arranged opposite to the first information sign drawing 21 so as to be illuminated by the light from the upper surface 11 or the lower surface 12 Illuminate, and then display the graphics on the second information sign drawing 24. Here, the second information sign drawing 24 also has an escape instruction pattern as an example. However, in practical applications, the first information sign drawing 21 and the second information sign drawing 24 may have different patterns. The second protective cover 25 is placed on the second information sign drawing 24 to achieve the effect of protecting the second information sign drawing 24. Similarly, the second protective cover 25 can be made of acrylic or glass that has both light transmission and rigid protection. In response to some usage requirements, the light-emitting device 2 of the present invention can also be a product that emits light on both sides, so that after the light-emitting device 2 is installed, the light guide plate 1 inside can respectively illuminate the first information sign drawing 21 and the second information sign The graphics on the drawing 24 are for the user to view. Among them, the fixing member 23 is not only a ㄇ-shaped structure as shown in Fig. 5, but also a frame-shaped structure as shown in Fig. 6, and the light bar 20 can be correspondingly arranged on the long side of the fixing member 23. Inside, the light guide plate 1, the first information sign drawing 21, and the second information sign drawing 24 are respectively placed in the frame-shaped structure. The first protective cover 22 and the second protective cover 25 can be designed to be slightly larger than the fixed part in size and directly Corresponding to the first information sign drawing 21 and the second information sign drawing 24 are placed on top.

In summary, the light guide plate and light-emitting device disclosed in the present invention that can improve hot spots have established a new standardized rule for light-emitting products that can be accepted by the market, and use bright line light to eliminate the light on the light-incident side of the adjacent light guide plate. The phenomenon of uneven light emission in the dark. In other words, the present invention breaks away from the traditional design method of pursuing the uniformity of the overall light output in the visual presentation, and turns the light guide plate near the light entrance side area to appear as bright lines, thereby improving the hot spot phenomenon with the difference between bright and dark segments, and provides differentiation. In the past, the product specifications of the light guide plate and the applied light emitting device. Accordingly, the light guide plate and the light-emitting device applied thereto can have excellent light-emitting taste, allowing users to watch more comfortably without being affected by the bright and dark interlaced areas. Further, for some application requirements, the light extraction microstructure group can also be a non-arc-shaped concave structure, so that the main light emission direction of the light guide plate is not perpendicular to the upper surface or the lower surface but slightly offset, so that the user can See a clearer and brighter pattern. In addition, the application of the light guide plate of the present invention has the advantages of larger visible area and lower product cost, and with this advantage, the light-emitting state of the bright line can still be used to improve the serious unevenness of brightness and darkness.

1: Light guide plate 10: Glossy surface 11: upper surface 12: lower surface 13: Light extraction microstructure group 14: Bright line microstructure group 15: Transition zone 2: Light-emitting device 20: light bar 200: light source 21: The first information sign drawing 22: The first protective cover 23: fixed parts 24: Drawing of the second information sign 25: second protective cover A: Length of transition zone B: Spread light range P: light source setting distance N: The normal of the upper surface or the lower surface

Figure 1 is a three-dimensional schematic diagram of the light guide plate and the light source according to the preferred embodiment of the present invention. Figure 2 is a schematic partial plan view of the light guide plate and the light source according to the preferred embodiment of the present invention. FIG. 3 is a diagram of the light energy distribution in the area adjacent to the light incident surface when the light guide plate of the preferred embodiment of the present invention is applied. Figure 4 is a partial schematic diagram of the light guide plate and the light extraction microstructure of the preferred embodiment of the present invention. FIG. 5 is an exploded schematic diagram of the structure of the light emitting device according to the preferred embodiment of the present invention. FIG. 6 is an exploded view of the structure of another implementation state of the light-emitting device according to the preferred embodiment of the present invention.

1: Light guide plate

10: Glossy surface

11: upper surface

12: lower surface

13: Light extraction microstructure group

14: Bright line microstructure group

15: Transition zone

20: light bar

200: light source

Claims (9)

A light guide plate that can improve the hot spot phenomenon is provided with a plurality of light sources, wherein the light sources are arranged at intervals, and each of the light sources has a light spreading range. The light guide plate includes: A light-incident surface for receiving side-entry light from the light sources; An upper surface, which is vertically adjacent to the light incident surface; The lower surface is vertically adjacent to the light-incident surface; wherein, the upper surface or the lower surface starts from the point where it is adjacent to the light-incident surface, and extends a certain distance in the direction relative to the light-incident surface to form a transition zone; A group of light-harvesting microstructures arranged on the upper surface or the lower surface in an area other than the transition zone; and A plurality of bright line microstructure groups are respectively arranged in the transition area, and each of the bright line microstructure groups is located between any two adjacent light spreading ranges, so as to make the light from the light sources pass the incident light After the surface enters, the bright line microstructure group is acted upon to form a bright line light-emitting state, thereby improving the hot spot phenomenon adjacent to the light-incident surface area. For the light guide plate that can improve the hot spot phenomenon described in the first item of the scope of patent application, the length of the transition zone is A, and the arrangement pitch of the light sources is P, and it conforms to the relational expression of 0.15≦A/P≦0.16. The light guide plate that can improve the hot spot phenomenon as described in the first item of the scope of patent application, wherein the two ends of each bright line microstructure group extend into the light spreading range, and the layout area of each bright line microstructure group It is elongated and its extending direction is parallel to the long axis of the light incident surface. The light guide plate that can improve the hot spot phenomenon as described in item 1 of the scope of patent application, wherein the light extraction microstructure group is a plurality of non-arc-shaped recessed structures, so that the light direction of the light is aligned with the upper surface or The normal line of the lower surface forms an angle. A light-emitting device that can improve hot spots, including: A light bar with a plurality of light sources, wherein the light sources are arranged at intervals, and each of the light sources has a light spreading range; A light guide plate, including: A light-incident surface for receiving the side-entry light from the light bar; An upper surface, which is vertically adjacent to the light incident surface; The lower surface is vertically adjacent to the light-incident surface; wherein, the upper surface or the lower surface starts from the point where it is adjacent to the light-incident surface, and extends a certain distance in the direction relative to the light-incident surface to form a transition zone; A group of light-harvesting microstructures arranged on the upper surface or the lower surface in an area other than the transition zone; and A plurality of bright line microstructure groups are respectively arranged in the transition area, and each of the bright line microstructure groups is located between any two adjacent light spreading ranges, so as to make the light from the light sources pass the incident light After the surface enters, the bright line micro-structure group will form a bright line light-emitting state, thereby improving the hot spot phenomenon in the area adjacent to the light-incident surface; A drawing of a first information sign, which is set corresponding to the upper surface or the lower surface, so as to illuminate the graphics on the drawing of the first information sign when light is emitted from the upper surface or the lower surface; A first protective cover, which is placed on the drawing of the first information sign; and A fixing member 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 positioned and assembled with each other. For the light-emitting device capable of improving the hot spot phenomenon described in item 5 of the scope of patent application, the length of the transition zone is A, and the arrangement pitch of the light sources is P, and it conforms to the relational expression of 0.15≦A/P≦0.16. The light-emitting device capable of improving the hot spot phenomenon as described in item 5 of the scope of patent application, wherein the two ends of each bright line microstructure group extend into the light spreading range, and the arrangement area of each bright line microstructure group It is elongated and its extending direction is parallel to the long axis of the light incident surface. As described in item 5 of the scope of patent application, the light-emitting device that can improve the hot spot phenomenon, wherein the light extraction microstructure group is a plurality of non-arc-shaped recessed structures, so that the light direction of the light is aligned with the upper surface or The normal line of the lower surface forms an angle. As described in item 5 of the scope of patent application, the light-emitting device that can improve the hot spot phenomenon further includes a second information sign drawing and a second protective cover, and the second information sign drawing and the second protective cover are fixed by the The second information sign drawing is arranged opposite to the first information sign drawing so as to be illuminated by the light from the upper surface or the lower surface to display the graphics on the second information sign drawing; The second protective cover is arranged on the second information sign drawing.

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