Light guide module

Abstract

The utility model provides a light guide module which comprises a light guide plate and a light-emitting assembly. The light guide plate has a light incident surface, and the light incident surface has a lens array. The light-emitting assembly comprises a substrate and LEDs, the substrate is provided with a reflection area and a light absorption area, the reflection area and the light absorption area are adjacently arranged, and the LEDs are arranged in the light absorption area at intervals. Wherein the light guide plate covers the substrate, so that a part of the light guide plate is overlapped on the reflection area and a part of the light absorption area, and the lens array is positioned in the light absorption area and corresponds to the LED. Therefore, the hot spot phenomenon can be effectively improved, and more excellent light emitting performance is provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical product field especially a light guide module BACKGROUND

[0002] The light guide module is a kind of optical product that can adjust point light source to form uniform surface light, it is used to provide uniform light, is widely used in various display devices, for example, in liquid crystal display, notebook computer, mobile phone and other equipment as backlight module is used, to provide uniform and have enough brightness light from display panel backside;Or in electronic paper product as front light module is used, to provide uniform and soft auxiliary light from panel front side.

[0003] Hot spot phenomenon is that light guide module generates local area light intensity too high highlight when light, and then leads to bright and dark uneven phenomenon, these bright and dark uneven light performance can seriously affect display effect.One of the factors leading to hot spot phenomenon is light source configuration, since light guide module mostly uses point light source as light source, therefore, the number, layout of point light source and the distance from light guide plate etc. will affect light distribution, for example, using less point light source quantity leads to its arrangement spacing too large, and hot spot with local brightness too high can be formed.If this problem is to be solved, it can be improved by increasing the number of point light sources, because by more point light source quantity, the distance between each point light source can be shortened, thereby achieving more uniform light distribution, but the mode can also lead to cost increase, poor heat dissipation and high energy consumption etc.Disadvantages.

[0004] Therefore, the present application is based on the rich experience of the related industry, and conceives and proposes a light guide module, which can provide a light guide module product with more uniform light output effect. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at providing a light guide module, which can effectively improve hot spot phenomenon and improve overall light uniformity through special design and assembly mode of light emitting assembly and light guide plate.

[0006] To achieve the above-mentioned purpose, the utility model discloses a light guide module in one embodiment, comprising: a light guide plate having a light entrance surface, the light entrance surface has a lens array;And light emitting assembly, including substrate and multiple LED, the substrate has reflection area and light absorption area, the reflection area and the light absorption area are adjacently arranged, and the LED is arranged in the light absorption area with interval;Wherein, the light guide plate cover is arranged on the substrate, so that part of the area of the light guide plate is overlapped on the reflection area and part of the light absorption area, and the lens array is located in the light absorption area and corresponds to the LED.By the above structural features, the light guide module can effectively avoid the problem of uneven light caused by hot spot phenomenon.

[0007] In another embodiment, the lens array comprises a plurality of optical microstructures, the optical microstructures are arranged in succession, so that the lens array forms a sawtooth or wavy structure, and the distance between any two adjacent optical microstructures is 370±150um. Thus, effective light distribution adjustment can be achieved for the LED, and local over-bright areas can be eliminated.

[0008] In addition, in one embodiment, each optical microstructure is a convex structure, and the convex length is 100±50um. This structure and size feature show a better practical application structure state of the lens array.

[0009] Furthermore, in another embodiment, the diameter of each optical microstructure is 150±50um, so as to have a better light entrance angle adjustment effect.

[0010] In addition, in one embodiment, the reflective area is formed by brushing white glue on the substrate, so as to have excellent light reflection effect and manufacturing convenience.

[0011] In yet another embodiment, the light-absorbing area is formed by brushing black glue on the substrate, which also has excellent manufacturing convenience and good light-absorbing effect.

[0012] Regarding the appropriate application size of the substrate, in one embodiment, the width of the substrate can be 6-7mm.

[0013] In summary, the light guide module of the present application solves the hot spot phenomenon through the special light guide plate and light emitting component assembly structure, and can achieve the effect of uniform light emission with a smaller number of LEDs, effectively improves the existing defects and can greatly reduce the product cost, and provides a more excellent optical product in the market. Further, the present application also proposes many additional technical features, such as appropriate structure size performance or light-absorbing and reflective area forming scheme, as described in the above paragraphs. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 Fig. 1 is a structure exploded schematic view of a light guide module according to an embodiment of the present application.

[0015] Figure 2 Fig. 2 is a planar schematic view of a light guide module according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] The present application will be described in more detail below by way of examples and with reference to the accompanying drawings.

[0017] As described before, in order to effectively overcome the hot spot phenomenon of the light guide module, while avoiding the high cost caused by using a large number of point light sources, the utility model provides a light guide module which applies a light entrance surface microstructure and a special light source structure design, and the technical features of the utility model will be described in detail below by combining the drawings with the text. The structure size, proportion, size, shape or application state shown in each drawing is only for illustration, and is used to illustrate the technical features of the utility model, and does not represent the actual structure design, and this is stated.

[0018] Please refer to Figure 1 and Figure 2 , which are respectively the light guide module structure exploded view and the plane view of one embodiment of the utility model. The utility model provides a light guide module 1, which comprises a light guide plate 10 and a light emitting assembly 11. The light guide plate 10 has a light entrance surface 101, and the light entrance surface 101 has a lens array 102. More specifically, in one implementation state, the light guide plate 10 can be a rectangular plate body, and the light entrance surface 101 is the side surface of the light guide plate 10, so as to receive light from the side. After the light enters the light guide plate 10, it can form light out of the light guide plate 10 through a side surface (for example, the upper surface of the light guide plate shown in Figure 1 ) which is vertically adjacent to the light entrance surface 101. The light emitting assembly 11 comprises a substrate 111 and a plurality of LEDs (light emitting diodes) 112. The substrate 111 has a reflection area 1111 and an absorption area 1112. The reflection area 1111 and the absorption area 1112 are arranged adjacent to each other. The LEDs 112 are arranged in the absorption area 1112 in a spaced manner. The light guide plate 10 is arranged on the substrate 111, so that part of the light guide plate 10 is arranged on the reflection area 1111 and part of the absorption area 1112. The lens array 102 is located in the absorption area 1112 and corresponds to the LEDs 112, so as to receive the incident light of the LEDs 112. In Figure 1 , the absorption area 1112 is shown by a cross-section line for the sake of convenience, while in Figure 2 , the range of the absorption area 1112 is not shown by a cross-section line in order to avoid the line being messy and affecting the viewing.

[0019] Therefore, when the LEDs 112 are turned on, the light of the LEDs 112 enters the light guide plate 10 through the lens array 102, and the light of the LEDs 112 can be adjusted to expand the light entrance angle by the structure of the lens array 102. At the same time, according to the reflection area 1111 of the substrate 10, the light can be reflected back into the light guide plate 10 to maintain the brightness of the light entrance side. The absorption area 1112 can effectively absorb part of the leaked light, thereby slowing down the local bright spot during light emission and improving the overall light emission uniformity. In this way, the problem of hot spot phenomenon caused by local over-brightness during light emission can be effectively solved. Moreover, under this structure feature, the light guide module 1 can select a smaller number of LEDs 112, thereby reducing the product cost.

[0020] As to the lens array 102, it can include a plurality of optical microstructures 1021 arranged in series, so that the lens array 102 forms a sawtooth or wavy structure, and the distance P between any two adjacent optical microstructures 1021 is 370±150um. Specifically, the optical microstructure 1021 can be a V-shaped structure or an arc-shaped structure. When the optical microstructure 1021 is a V-shaped structure, the lens array 102 forms a sawtooth structure, and when the optical microstructure 1021 is an arc-shaped structure, the lens array 102 forms a wavy structure. In practical applications, the distance P between the optical microstructures 1021 can be, for example, 369um, 280um, etc.

[0021] Further, in the present embodiment, the optical microstructure 1021 is taken as an example of a convex structure, and the convex length L of each optical microstructure 1021 is 100±50um. The optical microstructure 1021 can have excellent light adjusting performance within this size range. In practical applications, the convex length L of the optical microstructure 1021 can be, for example, 80um, 90um, etc.

[0022] When the lens array 102 forms a wavy structure according to the optical microstructure, i.e., each optical microstructure 1021 is an arc-shaped structure, the diameter D of each optical microstructure 1021 can be 150±50um, so that the light incident on the light guide plate 10 is expanded and adjusted to an appropriate angle by appropriate structural performance, achieving better light expansion effect. In practical applications, the diameter D of the optical microstructure 1021 can be, for example, 170um, 140um, etc. It is noted that the above-mentioned size conditions of the optical microstructure 1021, i.e., the distance P between any two adjacent optical microstructures 1021, the convex length L of the optical microstructure 1021, and the diameter D of the optical microstructure 1021, etc., can simultaneously satisfy three size conditions, or any two or one of them can be selected for implementation.

[0023] As to the light emitting component 11, the substrate 111 can be, for example, a flexible printed circuit board, and the reflective area 1111 is formed by brushing white glue on the substrate 11, which has certain advantages in process and also makes the reflective area 1111 have excellent light reflection performance.

[0024] Similarly, the light-absorbing area 1112 can also be formed by brushing black glue on the substrate 111, which is also conducive to production and manufacturing and ensures the light leakage absorption performance of the light-absorbing area 1112. The light-absorbing area 1112 and the reflecting area 1111 can simultaneously meet the above technical features, or alternatively, when the light-absorbing area 1112 and the reflecting area 1111 are respectively formed by brushing black glue and white glue on the substrate 111, the specific process can be, for example, brushing black glue on the entire substrate 111 first, and then brushing white glue on the predetermined reflecting area 1111, or conversely, brushing white glue on the entire substrate 111 first, and then brushing black glue on the predetermined light-absorbing area 1112.

[0025] In addition, the utility model also proposes appropriate size conditions for the width of the substrate 111. In one implementation state, the width W of the substrate 111 can be 6-7 mm, so that the light-absorbing area 1112 and the reflecting area 1111 have a certain area after the LED 112 is arranged, avoiding that the overall module volume is increased due to the too large width of the substrate 111, or that the light-absorbing area 1112 and the reflecting area 1111 have too small area and cannot play the proper reflection and absorption functions of light. In practical applications, the width W of the substrate 111 can be, for example, 6.4 mm or 6.8 mm, etc.

[0026] In summary, the light guide module disclosed by the utility model successfully solves the common hot spot phenomenon in the traditional light guide module through the lens array structure of the light guide plate and the design of the light-absorbing area and the light-emitting area, and the connecting relationship feature that the lens array is located in the light-absorbing area after the light guide plate cover is arranged on the substrate. Therefore, the light guide module can achieve uniform and efficient light output effect with a smaller number of LEDs, not only improves the design defects of the existing light guide module, but also greatly reduces the material and production costs, and provides higher quality and more economical optical product options. The utility model also proposes various additional technical features to further improve the performance of the light guide module, for example, the lens array can include a plurality of optical microstructures arranged in series, and appropriate size conditions are proposed for the pitch, protruding length and diameter of the optical microstructure to achieve the required light spreading effect and achieve a more perfect light output uniformity performance. As for the light-absorbing area and the reflecting area, the utility model proposes that they can be formed by brushing black glue and white glue, which effectively simplifies the process while ensuring their performance. As for the substrate part, the utility model proposes appropriate size ranges for its width, so as to form a structure state that can effectively arrange the LED and at the same time make the light-absorbing area and the reflecting area have sufficient acting area performance. Overall, the light guide module of the utility model effectively solves the hot spot phenomenon, provides a new optical product with high performance, low cost advantages and meets market demand.

[0027]

Explanation of the drawings

[0028] 1 light guide module

[0029] 10 light guide plate

[0030] 101 light incident surface

[0031] 102 lens array

[0032] 1021 optical microstructure

[0033] 11 light emitting assembly

[0034] 111 substrate

[0035] 1111 reflective region

[0036] 1112 light absorbing region

[0037] 112 LED

[0038] P pitch of optical microstructure

[0039] L protrusion length of optical microstructure

[0040] D diameter of optical microstructure

[0041] W width of substrate

Claims

1. A light guide module, characterized by, The application relates to a light-emitting module, comprising: a light guide plate having an incident light surface provided with a lens array; and a light-emitting assembly comprising a substrate and a plurality of LEDs, the substrate having a reflection area and an absorption area, the reflection area and the absorption area being adjacently arranged, and the LEDs being arranged in the absorption area in a spaced manner; wherein the light guide plate is arranged on the substrate, so that part of the light guide plate is arranged on the reflection area and part of the absorption area, and the lens array is located in the absorption area and corresponds to the LEDs. The lens array comprises a plurality of optical microstructures arranged in a continuous manner, so that the lens array forms a sawtooth or wave structure, and the distance between any two adjacent optical microstructures is 370+ / -150um.

2. The light guide module of claim 1, wherein, Each optical microstructure is a convex structure, and the convex length is 100+ / -50um.

3. The light guide module of claim 2, wherein, The diameter of each optical microstructure is 150+ / -50um.

4. The light guide module of claim 3, wherein, The diameter of each optical microstructure is 150+ / -50um.

5. The light guide module of claim 2, wherein, The lens array comprises a plurality of optical microstructures arranged in a continuous manner, so that the lens array forms a sawtooth or wave structure, each optical microstructure is a convex structure, and the convex length is 100+ / -50um.

6. The light guide module of claim 1, wherein, The diameter of each optical microstructure is 150+ / -50um.

7. The light guide module of claim 6, wherein, The lens array comprises a plurality of optical microstructures arranged in a continuous manner, so that the lens array forms a wave structure, and the diameter of each optical microstructure is 150+ / -50um.

8. The light guide module of claim 1, wherein, The reflection area is formed by brushing white glue on the substrate.

9. The light guide module of claim 1, wherein, ​

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