TWI620964B - Light guide module - Google Patents

Abstract

A light guide module includes a light transmitting film and a light emitting pattern. The light-transmitting film includes a light emitting surface and a light incident surface. The light emitting pattern is formed on the light emitting surface. The light emitting pattern includes a plurality of spaced-apart sub-patterns. Each sub-pattern includes a cutting groove. Each cutting groove has an inner wall adjacent to the light emitting surface. The inner wall of the cutting groove of each sub-pattern has a total surface area. The total surface area of each of the sub-patterns is positively related to the distance between the sub-patterns and the light incident surface.

Description

Light guide module

The present invention relates to a light guide module, and more particularly to a light guide module with a light transmitting film.

As the appearance design of today's electronic products (such as laptops, tablets, or smart phones) is moving towards a thin concept, the size of internal components of electronic products also needs to be changed accordingly.

However, when the light guide film of the internal light emitting module is thinned to a certain extent, the light guide film will affect its light output efficiency due to its insufficient thickness, which will cause serious loss of light efficiency and poor light uniformity. problem.

Therefore, how to develop a solution to improve the above-mentioned shortcomings and inconveniences is really an important issue for related industry.

An embodiment of the present invention provides a light guide module. The light guide module includes a light transmitting film and a light emitting pattern. The light-transmitting film includes a light emitting surface and a light incident surface. The light emitting pattern is formed on the light emitting surface. The light emitting pattern includes a plurality of first sub-patterns arranged at intervals. Each first sub-pattern includes at least one first cutting groove. Each first cutting groove has at least one first cutting groove adjacent to the light emitting surface. An inner wall, the first inner wall of the first cutting groove of each first sub-pattern has a first total surface area, and the first total surface area of the first sub-patterns and the distance between the first sub-patterns and the light incident surface respectively Size is positively correlated.

In one or more embodiments of the present invention, the first cutting grooves are formed by die stamping.

In one or more embodiments of the present invention, the light incident surface is located between two relatively short sides of the light emitting surface, and the light emitting surface is divided into a first region and a second region. These first sub-patterns are located in a first region of the light emitting surface.

In one or more embodiments of the present invention, the light emitting pattern further includes a plurality of second sub-patterns arranged at intervals. Each second sub-pattern includes at least one second cutting groove. Each second cutting groove has at least one second inner wall adjacent to the light emitting surface. The second inner wall of the second cutting groove of each second sub-pattern has a second total surface area, and the second total surface area of the second sub-patterns is positively related to the distance between the second sub-patterns and the light incident surface, respectively.

In one or more embodiments of the present invention, the shape notches of each first cutting groove and each second cutting groove face each other.

In one or more embodiments of the present invention, the light guide module further includes at least one light shielding sheet. The light-shielding sheet covers the light-emitting surface and is between any two adjacent first sub-patterns.

In one or more embodiments of the present invention, the light shielding sheet includes a shielding layer and a reflective layer stacked on each other. The reflective layer is located between the light emitting surface and the shielding layer.

In one or more embodiments of the present invention, the first sub-patterns are arranged in at least two pattern rows. The pattern rows are parallel to each other, and the first sub-patterns of the pattern rows are offset from each other.

Another embodiment of the present invention provides a light guide module. The light guide module includes a light transmitting film and a light emitting pattern. The light-transmitting film includes a light emitting surface and a light incident surface. The light emitting pattern is formed on the light emitting surface and includes a plurality of spaced-apart sub-patterns, each of which includes at least one cutting groove. Each sub-pattern contains at least one light enhancement parameter. The light enhancement parameters of these sub-patterns are positively related to the distance between the sub-patterns and the light incident surface, respectively.

In one or more embodiments of the present invention, the light enhancement parameter of each sub-pattern is selected from the group consisting of the length, depth, opening size and number of the cutting grooves of each sub-pattern.

In this way, with the light guide module described in the above embodiment, the light guide module not only does not affect its light emitting efficiency, but also improves its light due to the cutting grooves formed on the light-transmitting film and the arrangement of the cutting grooves. Evenness.

The above is only used to explain the problem to be solved by the present invention, the technical means for solving the problem, and the effects produced by it, etc. The specific details of the present invention will be described in detail in the following embodiments and related drawings.

In the following, a plurality of embodiments of the present invention will be disclosed graphically. For the sake of clear description, many practical details will be described in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in the embodiment of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventional structures and components will be shown in the drawings in a simple and schematic manner.

Since the conventional light guide film has insufficient thickness to affect its light emitting efficiency, resulting in serious loss of light efficiency and poor light uniformity, the light guide module of the present invention includes a light transmitting film and a light emitting pattern. The light emitting pattern is formed on the light emitting surface of the light-transmitting film. The light output pattern includes a plurality of sub-patterns arranged at intervals, and each sub-pattern further includes at least one light enhancement parameter. There is a distance from each sub-pattern to the light-entry mask of the light-transmitting film. The light enhancement parameters of these sub-patterns have a positive correlation with the distance between them and the light-incident surface of the light-transmitting film, which means that the greater the distance between the sub-patterns and the light-incident surface, the greater the value of the light-enhancement parameter, and the greater the brightness available for enhancement Large; vice versa. By way of example and not limitation, each sub-pattern includes at least one cutting groove. The light enhancement parameters of each sub-pattern are the length, depth, opening size, and / or number of cutting grooves of each sub-pattern.

FIG. 1 is a top view of a light guide module 10 according to an embodiment of the present invention. Fig. 2 shows a sectional view of Fig. 1 based on the line segment A-A. As shown in FIG. 1 and FIG. 2, in this embodiment, the light guide module 10 includes a light transmitting film 100 and a light emitting pattern 200. The transparent film 100 includes a first film surface 110, a second film surface 120, and a plurality of sides 130. The first film surface 110 is opposite to the second film surface 120. These side edges 130 surround the first film surface 110 and the second film surface 120 between the first film surface 110 and the second film surface 120, and each side edge 130 is adjacent to the first film surface 110 and the second film surface 120, and the area of either side 130 is smaller than the area of the first film surface 110 or the second film surface 120. By way of example and not limitation, the first film surface 110 is substantially rectangular, and has two relatively long sides 111 and two relatively short sides 112, each of which is adjacent to the two short sides 112, and each of the short sides 112 Adjacent to these two long sides 111.

In addition, the light-transmitting film 100 further includes a plurality of slots 140. Each slot 140 can be extended into at least one light source (such as a light emitting diode, not shown). The light L of the light source can enter the light-transmitting film 100 through the inner surface 141 of the slot 140. Therefore, the inner surface 141 of the slot 140 is regarded as the light incident surface, and the first film surface 110 of the transparent film 100 is regarded as the light emitting surface. For example, each slot 140 penetrates from the first film surface 110 to the second film surface 120. These slots 140 (that is, the light incident surface) are located between the two short sides 112 of the first film surface 110, and their positions are roughly referred to as the middle region 116 of the first film surface 110, and the first film surface 110 is initially divided into First zone 114 and second zone 115.

The light emitting pattern 200 includes a plurality of first pattern rows 210 and a plurality of second pattern rows 220. The first pattern rows 210 are parallel to each other, and the long-axis direction D of each first pattern row 210 is substantially parallel to the long-axis direction D of the first film surface 110. Each first pattern column 210 includes a plurality of first sub-patterns 211. The first sub-patterns 211 are all located in the first region 114. The first sub-patterns 211 of each first pattern row 210 are arranged at intervals in a single row, and the first sub-patterns 211 of any two adjacent first pattern rows 210 are offset from each other. However, the present invention is not limited thereto. Each first sub-pattern 211 includes at least a first cutting groove 212. In this embodiment, for example, the light enhancement parameter of each first sub-pattern 211 is the length 212L of the first cutting groove 212. Therefore, the same Of these first cutting grooves 212 in the first pattern row 210, the farther away the first cutting groove 212 from the groove 140 (ie, the light incident surface) is, the longer the length 212L is, and vice versa. For example, the first cutting groove 212 is C-shaped, and the length 212L of the first cutting groove 212 is the track length 212L of the first cutting groove 212 extending along its outline. In other words, each first cutting groove 212 has a first inner wall 212W (FIG. 2) adjacent to the first film surface 110. The length 212L of each first cutting groove 212 will determine the corresponding first sub-pattern 211. The total surface area of the first inner wall 212W of all the first cutting grooves 212 in the inside is referred to herein as the first total surface area, that is, the first inner wall 212W of the first cutting groove 212 of each first sub-pattern 211 has A first total surface area. Therefore, the total surface area of each of the first sub-patterns 211 is positively related to the distance from the specific first sub-pattern 211 to the light incident surface. In this way, the transmitted light L encounters the total reflection damage caused by the first inner wall 212W of the first cutting groove 212, so that the light L passes through the first film surface 110 to emit light in advance, and then passes through the use of different sizes, shapes, depths, and positions of the cutting groove. , Angle, etc., and then adjust its uniformity.

Similarly, the second pattern rows 220 are parallel to each other, and the long-axis direction D of each second pattern row 220 is substantially parallel to the long-axis direction D of the first film surface 110. Each second pattern column 220 includes a plurality of second sub-patterns 221. These second sub-patterns 221 are all located in the second region 115. The slots 140 are located substantially between the first sub-patterns 211 and the second sub-patterns 221. The second sub-patterns 221 of each second pattern row 220 are arranged at intervals in a single row, and the second sub-patterns 221 of any two adjacent second pattern rows 220 are offset from each other. However, the present invention is not limited thereto. Each second sub-pattern 221 includes at least a second cutting groove 222. In this embodiment, for example, the light enhancement parameter of each second sub-pattern 221 is the length 222L of the second cutting groove 222. Therefore, the same Of these second cutting grooves 222 in the second pattern row 220, the farther away the second cutting groove 222 from the groove 140 (ie, the light incident surface) is, the longer the length 222L is, and vice versa. For example, the second cutting groove 222 is C-shaped, and the length 222L of the second cutting groove 222 is the track length of the second cutting groove 222 extending along its outline. In other words, each second cutting groove 222 has a second inner wall adjacent to the first film surface 110 (refer to the first inner wall 212W), and the length of the second cutting groove 222 will be determined to correspond to the second sub-pattern 221 The total surface area of the second inner wall (refer to the first inner wall 212W) of all the second cutting grooves 222 is referred to as the second total surface area. The second inner wall 222W of the second cutting groove 222 of each second sub-pattern 221 has a second total surface area. Therefore, the total surface area of each of the second sub-patterns 221 is positively related to the distance from the specific second sub-pattern 221 to the light incident surface.

In this embodiment, since each first cutting groove 212 is C-shaped, the first cutting groove 212 having a C-shape defines a first shape notch 213. The first cutouts 213 of the first cutting grooves 212 face the middle region 116 and the second region 115. Since each of the second cutting grooves 222 is C-shaped, the second cutting groove 222 having a C-shape defines a second external shape notch 223. The second shape notches 223 of the second cutting grooves 222 are all oriented toward the middle region 116 and the first region 114. In other words, the first notch 213 of the first cutting groove 212 and the second notch 223 of the second cutting groove 222 face each other.

However, the present invention is not limited to the shape of the cutting grooves must be C-shaped, and the shape of the cutting grooves in the same pattern row must not be the same. As shown in FIG. 1, the transparent film 100 is closest to the first film surface. The first cutting groove 212 'and the second cutting groove 222' of the short side 112 of 110 may also be substantially rectangular.

It must be understood that, in this embodiment, since any of the slots 140 (that is, the light incident surface) of the light-transmitting film 100 is not arranged neatly, and the light incident surfaces of all the slots 140 do not correspond to a specific sub-pattern, however, because Any slot 140 (that is, the light incident surface) of the light-transmitting film 100 is quite close to the middle line 113 of the first half of the first film surface 110, and the middle half of the first half of the first film surface 110 is the shortest connection Therefore, in reality, the distance between each sub-pattern and the light-incident surface of the light-transmitting film 100 can also be regarded as the minimum straight distance from each sub-pattern along the above-mentioned long axis direction D to the middle line 113 of the first film surface 110. .

In the above embodiment, for example, the first cutting groove 212 and the second cutting groove 222 are through holes, that is, the first cutting groove 212 and the second cutting groove 222 are respectively from the first film of the light-transmitting film 100. The surface 110 penetrates to the second film surface 120. However, the present invention is not limited to this. In other embodiments, the first cutting groove 212 and the second cutting groove 222 can also be blind holes. In addition, the first cutting groove 212 and the second cutting groove 222 are formed by die stamping. However, the present invention is not limited thereto. In other embodiments, the first cutting groove 212 and the second cutting groove 222 may also be formed. It is formed by etching die, hardware die, laser die, CNC processing or laser processing.

FIG. 3 is a partial cross-sectional view of a light guide module 11 according to an embodiment of the present invention, and its cross-sectional position is the same as that of FIG. 2. The light guide module 11 in FIG. 3 is substantially the same as the light guide module 10 in FIG. 1, and the same components use the same symbols. The difference between the light guide module 11 in FIG. 3 and the light guide module 10 in FIG. 1 is that the light guide module 11 in FIG. 3 further includes a light shielding sheet 300. The light-shielding sheet 300 partially covers the first film surface 110 of the light-transmitting film 100 and is interposed between any two adjacent sub-patterns 224. Specifically, the light shielding sheet 300 has a plurality of openings 301, and the openings 301 are aligned one by one and connect the cutting grooves 214 of each sub-pattern 224. The same, however, the openings 301 and the cutting grooves 214 of the light shielding sheet 300 of the present invention need not have the same shape. In addition, the light shielding sheet 300 includes a shielding layer 310 and a reflective layer 320 stacked on each other. The reflective layer 320 is located between the first film surface 110 and the shielding layer 310 of the transparent film 100. In this way, the light L advancing toward the first film surface 110 of the light-transmitting film 100 can be repeatedly reflected by the reflective layer 320 to be guided to the other cutting grooves 214 to further strengthen the light intensity of the corresponding sub-pattern 224.

FIG. 4 is a partial cross-sectional view of a light guide module 12 according to an embodiment of the present invention, and its cross-sectional position is the same as that of FIG. 2. The light guide module 12 in FIG. 4 is substantially the same as the light guide module 10 in FIG. 1, and the same components use the same symbols. The difference between the light guide module 12 in FIG. 4 and the light guide module 10 in FIG. 1 is that, as shown in FIG. 4, in this embodiment, the cutting groove 230 of the sub-pattern 225 in FIG. 4 is a blind hole. That is, the cutting groove 230 is not connected to the second film surface 120. In addition, the light enhancement parameter of the sub-pattern 225 is the size of the opening 231 of the cutting groove 230 of the sub-pattern 225. Therefore, the farther away from the light-receiving surface, the opening size of the cutting groove 230 of the sub-pattern 225 is larger, and vice versa.

In detail, each cutting slot 230 includes an opening 231 and a groove 232. The opening 231 is connected to the first film surface 110 of the light-transmitting film 100 and the groove 232. The bottom of the groove 232 is the bottom of the cutting groove 230, and the diameter 231W of the opening 231 is greater than the diameter 232W of the groove 232. The diameter 231W of the opening 231 is the opening size of the cutting groove 230. The total surface area of the opening 231 and the groove 232 is the total surface area of the inner wall of the cutting groove 230. Therefore, for grooves of the same length, the diameter of the opening 231 with a diameter of 231W will determine the total surface area of the inner wall of the cutting groove 230 corresponding to the sub-pattern 225. Therefore, the total surface area of each of the sub-patterns 225 is positively related to the distance between the sub-patterns 225 and the light incident surface.

FIG. 5 is a top view of the light guide module 13 according to an embodiment of the present invention. The light guide module 13 in FIG. 5 is substantially the same as the light guide module 10 in FIG. 1, and the same components use the same symbols. The difference between the light guide module 13 in FIG. 5 and the light guide module 10 in FIG. 1 is that, as shown in FIG. 5, the light transmitting film 100 uses one side 130 as the light incident surface, and is not slotted. Inside. In addition, the light enhancement parameters of each of the sub-patterns 240A, 240B, and 240C in FIG. 5 are the number of cutting grooves 241A, 241B, and 241C included in the sub-patterns 240A, 240B, and 240C. The greater the number of cutting grooves of the child patterns of the side 130) of the film 100, and vice versa.

In detail, the light emitting pattern 201 has three sub-patterns 240A, 240B, and 240C. As shown in FIG. 5, the sub-pattern 240A closest to the light-entering surface (ie, the side 130 of the light-transmitting film 100) has a cutting groove 241A. The sub-pattern 240B near the light-incident surface (that is, the side 130 of the light-transmitting film 100) has two cutting grooves 241B, and the sub-pattern 240C farthest from the light-incident surface (that is, the side 130 of the light-transmitting film 100) has three cutting grooves 241C. , And each cutting groove 241A, 241B, 241C has the same size. In this way, each cutting groove 241A, 241B or 241C has an inner wall 242 adjacent to the first film surface 110. The number of cutting grooves 241A, 241B or 241C included in this sub-pattern 240A, 240B or 240C will determine the corresponding sub-pattern 240A. The total surface area of the inner wall 242 of all the cutting grooves 241A, 241B, or 241C in the B, 240B, or 240C. In other words, the total surface area of the inner wall 242 of one cutting groove 241A of the sub-pattern 240A, the total surface area of the inner wall 242 of two cutting grooves 241B of the sub-pattern 240B, and the inner wall 242 of three cutting grooves 241C of the sub-pattern 240C The total surface area is positively related to the distance from the specific sub-pattern 240A, 240B or 240C to the light incident surface.

Finally, the embodiments disclosed above are not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. Invented. Therefore, the protection scope of the present invention shall be determined by the scope of the appended patent application.

10, 11, 12, 13‧‧‧ light guide module

100‧‧‧light-transmitting film

110‧‧‧The first film surface

111‧‧‧long side

112‧‧‧ short side

113‧‧‧ Folded in the middle

114‧‧‧ District 1

115‧‧‧Second District

116‧‧‧Middle area

120‧‧‧Second film surface

130‧‧‧ side

140‧‧‧Slotted

141‧‧‧ inside

200, 201‧‧‧lighting pattern

210‧‧‧ the first pattern column

211‧‧‧first child pattern

212, 212’‧‧‧first cutting slot

212L‧‧‧length

212W‧‧‧First inner wall

213‧‧‧First appearance gap

214‧‧‧cut groove

220‧‧‧ The second pattern column

221‧‧‧ second child pattern

222、222’‧‧‧Second cutting groove

222L‧‧‧length

223‧‧‧Second appearance gap

224, 225‧‧‧ sub-pattern

230‧‧‧cut groove

231‧‧‧ opening

231W‧‧‧ caliber

232‧‧‧Groove

232W‧‧‧ caliber

240A, 240B, 240C ‧‧‧ sub-pattern

241A, 241B, 241C‧‧‧cut groove

242‧‧‧Inner wall

300‧‧‧ Shading film

301‧‧‧opening

310‧‧‧ masking layer

320‧‧‧Reflective layer

A-A‧‧‧Segment

D‧‧‧ Long axis direction

L‧‧‧light

In order to make the above and other objects, features, advantages, and embodiments of the present invention more comprehensible, the description of the drawings is as follows: FIG. 1 illustrates a top view of a light guide module according to an embodiment of the present invention; Fig. 2 shows a sectional view of Fig. 1 based on line segment AA; Fig. 3 shows a partial sectional view of a light guide module according to an embodiment of the present invention, and its cross-sectional position is the same as that of Fig. 2; Fig. 4 shows the present invention A partial cross-sectional view of a light guide module according to an embodiment is the same as that of FIG. 2; and FIG. 5 is a top view of the light guide module according to an embodiment of the present invention.

Claims (9)

A light guide module includes: a light transmitting film including a light emitting surface and a light incident surface; and a light emitting pattern formed on the light emitting surface. The light emitting pattern includes a plurality of first sub-patterns arranged at intervals. Each of the first sub-patterns includes at least one first cutting groove. Each of the first cutting grooves has at least a first inner wall adjacent to the light emitting surface. The at least one first The at least one first inner wall of a cutting groove has a first total surface area, and the first total surface area of the first sub-patterns is positively related to the distance between the first sub-patterns and the light incident surface, respectively. Wherein the light incident surface is located between two relatively short sides of the light emitting surface, and the light emitting surface is divided into a first region and a second region, and the first sub-patterns are located on the first of the light emitting surface. Area. The light guide module according to claim 1, wherein the first cutting grooves are formed by die stamping. The light guide module according to claim 1, wherein the light emitting pattern further includes a plurality of spaced second sub-patterns, each of the second sub-patterns includes at least one second cutting groove, and each of the first The two cutting grooves have at least a second inner wall adjacent to the light emitting surface, and the at least one second inner wall of the at least one second cutting groove of each of the second sub-patterns has a second total surface area, wherein the The second total surface area of the second sub-patterns and the first sub-patterns The distance between the two sub-patterns and the light incident surface is positively correlated. The light guide module according to claim 3, wherein the shape cutouts of each of the first cutting grooves and each of the second cutting grooves face each other. The light guide module according to claim 1, further comprising at least one light shielding sheet covering the light emitting surface and interposed between any two adjacent first sub-patterns. The light guide module according to claim 5, wherein the light shielding sheet comprises a shielding layer and a reflective layer laminated on each other, and the reflective layer is located between the light emitting surface and the shielding layer. The light guide module according to claim 1, wherein the first sub-patterns are arranged into at least two pattern rows, the at least two pattern rows are parallel to each other, and the first sub-patterns of the at least two pattern rows are arranged in offset from each other . A light guide module includes: a light transmitting film including a light emitting surface and a light incident surface; and a light emitting pattern formed on the light emitting surface and including a plurality of spaced-apart sub-patterns, each of which includes At least one cutting groove, each of the sub-patterns includes at least one light enhancement parameter, wherein the light-enhancement parameters of the sub-patterns are positively related to the distance between the sub-patterns and the light incident surface, respectively, where The smooth side is located on the two short sides of the light emitting side. The light emitting surface is divided into a first area and a second area, wherein the first sub-patterns are located in the first area of the light emitting surface. The light guide module according to claim 8, wherein the at least one light enhancement parameter of each of the sub-patterns is selected from a group consisting of a length, a depth, an opening size, and a number of the cutting grooves.