CN204420756U - Light source module and light guide plate - Google Patents

Abstract

The utility model relates to a light source module, which includes a light guide plate and at least one light-emitting element. The light guide plate has a light incident surface, a first side surface, a second side surface and a third side surface, wherein the second side surface is opposite to the light incident surface, and the first side surface and the third side surface are connected to the second side surface. Side surface and light incident surface. The light guide plate includes multiple dot patterns. The dot patterns are located on at least one of the first side surface, the second side surface and the third side surface, and the surface density of these dot patterns is uniform. At least one light-emitting element is located next to the light incident surface. In addition, a light guide plate is also proposed. The light source module and the light guide plate of the present invention can improve the yellowing phenomenon at the picture position far away from the light-emitting diode, thereby making the white light of the light source module have good color uniformity.

Description

Light source module and light guide plate

technical field

The utility model relates to a light source module and a light guide plate, and in particular to a light source module and a light guide plate with dot patterns.

Background technique

With the development of optoelectronic technology, cold cathode fluorescent lamps (cold cathode fluorescent lamps, CCFLs) arranged on the side of the light guide plate in the prior art have been replaced by light-emitting diodes (light-emitting diodes, LEDs). Since the light emitting diode has the advantages of long service life, low power consumption, and fast response, the performance and service life of the light source module using the light emitting diode as the light source are also improved.

However, the current side-illuminated light source modules adopting light-emitting diodes mostly adopt single-side long-side or short-side light-input, and the light-emitting diodes are arranged in a straight line. The light-emitting mechanism of light-emitting diodes is usually to use blue chips to excite yellow phosphors as white light sources. In this way, when the light from the light-emitting diode enters the light guide plate, according to the Rayleigh scattering principle, blue light with a shorter wavelength is easier to scatter than red light with a longer wavelength, so when the light passes through the light guide plate, blue light with a shorter wavelength It is less likely to be transmitted to a position far away from the light-emitting diodes, which will cause yellowing of the screen. Therefore, how to make the side-illuminated light source module using LEDs have good color uniformity is a problem that needs to be improved at present.

China Taiwan Patent No. I335477 discloses a backlight module including a light source, a light guide plate and a frame. The light guide plate includes a light-emitting surface, a light-incident surface vertically connected to the light-emitting surface, and multiple side surfaces. The colored reflective structure is provided on the multiple sides, and the colored reflective structure is directly attached to the colored reflective material on the multiple sides. Chinese Patent No. 202443145 discloses a side-entry light guide plate, which includes a light-incident surface, two side surfaces perpendicular to the light-incident surface, and an end surface parallel to the light-incident surface. The color of the side reflective tape gradually transitions from white to blue-purple from the end near the light incident surface to the end far away from the light incident surface.

The paragraphs of the background technology are only used to help understand the content of the present utility model, so the content disclosed in the paragraph of the background technology may contain some prior art that are not known to those skilled in the art. The content disclosed in the background technology section does not mean that the content or the problems to be solved by one or more embodiments of the present utility model have been known or recognized by those skilled in the art before the application of the utility model.

Utility model content

The utility model provides a light source module, which can improve the yellowing phenomenon of the picture.

The utility model provides a light guide plate, which can improve the yellowing phenomenon of the picture.

Other purposes and advantages of the utility model can be further understood from the technical characteristics disclosed in the utility model.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a light source module. The light source module includes a light guide plate and at least one light emitting element. The light guide plate has a light incident surface, a first side surface, a second side surface and a third side surface, wherein the second side surface is opposite to the light incident surface, and the first side surface and the third side surface are connected to the second side surface. Side surface and incident surface. The light guide plate includes a plurality of dot patterns. The dot patterns are located on at least one of the first side surface, the second side surface and the third side surface, and the areal density of these dot patterns is uniform. At least one light emitting element is located beside the light incident surface.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides the aforementioned light guide plate.

In an embodiment of the present invention, the above-mentioned dot pattern is located on the second side surface.

In an embodiment of the present invention, the ratio of the area occupied by the above-mentioned dot pattern to the area of the second side surface falls within a range of 20% to 30%.

In an embodiment of the present invention, the above-mentioned dot pattern is located on the first side surface or the third side surface.

In an embodiment of the present invention, the ratio of the area occupied by the above-mentioned dot pattern to the area of the first side surface or the third side surface falls within a range of 20% to 30%.

In an embodiment of the present invention, the above-mentioned dot pattern is blue.

In an embodiment of the present invention, the above-mentioned dot pattern is striped, circular or polygonal.

Based on the above, the embodiments of the present invention can achieve at least one of the following advantages or effects. In the light source module of the embodiment of the present invention, a plurality of dot patterns are arranged on at least one side surface of the light guide plate. When the light is reflected by the dot patterns, the intensity of the blue light in the light beam will be enhanced. In this way, the light beam reflected by the dot pattern and exiting the light guide plate can also be biased towards blue, which can improve the yellowing phenomenon of the screen position far away from the light emitting diodes, so that the white light of the light source module has good color uniformity.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.

Description of drawings

FIG. 1A is a schematic structural diagram of a light source module according to an embodiment of the present invention.

FIG. 1B is a partial schematic diagram of the dot pattern in FIG. 1A .

FIG. 2A is a schematic side view of the light source module in FIG. 1A .

FIG. 2B is a partial schematic diagram of the light source module in FIG. 1A .

3A to 3B are partial schematic diagrams of different dot patterns.

Explanation of reference signs:

60: Beam

100: light source module

110: light guide plate

111: light incident surface

112: first side surface

113: second side surface

114: third side surface

120: light emitting element

130: reflection unit

NP: dot pattern

W1, W2: Width

Detailed ways

The aforementioned and other technical content, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only referring to the directions of the drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.

FIG. 1A is a schematic structural diagram of a light source module according to an embodiment of the present invention. FIG. 1B is a partial schematic diagram of the dot pattern in FIG. 1A . FIG. 2A is a schematic side view of the light source module in FIG. 1A . FIG. 2B is a partial schematic diagram of the light source module in FIG. 1A . Please refer to FIG. 1A , the light source module 100 of this embodiment includes a light guide plate 110 and at least one light emitting element 120 . Specifically, as shown in FIG. 1A, in this embodiment, the light guide plate 110 has a light incident surface 111, a first side surface 112, a second side surface 113, and a third side surface 114, wherein the second The side surface 113 is opposite to the light incident surface 111 , and the first side surface 112 and the third side surface 114 are connected to the second side surface 113 and the light incident surface 111 . The light emitting element 120 is located beside the light incident surface 111 for emitting a light beam 60 . Wherein, the light-emitting element 120 is, for example, a light-emitting diode with a blue chip and a yellow phosphor, but the present invention is not limited thereto.

In more detail, as shown in FIG. 1B , the light guide plate 110 includes a plurality of dot patterns NP, wherein the dot pattern NP is blue, for example. For example, in this embodiment, the dot pattern NP can be formed on the light guide plate 110 by printing or coating, so the material of the dot pattern NP can be, for example, ink or the like. For example, in this embodiment, the material of the dot pattern NP is, for example, blue ink.

Further, in this embodiment, the dot pattern NP is located on at least one of the first side surface 112 , the second side surface 113 and the third side surface 114 . For example, in this embodiment, the network dot patterns NP are located on the second side surface 113 , and the area density of these network dot patterns NP is uniform. Here, uniform surface density of the dot pattern NP means that the distribution area, density and color density of the dot pattern NP are consistent across the second side surface 113 . More specifically, in this embodiment, the dot pattern NP is striped, and the area occupied by the dot pattern NP and the area ratio of the second side surface 113 are about 25%, that is to say, the width of the area with the dot pattern NP The width W2 of W1 and other regions not coated with the dot pattern NP is about 1:3. It should be noted that the numerical ranges herein are used for illustrative purposes only, and are not intended to limit the present invention.

In other embodiments, the ratio of the area occupied by the dot pattern NP to the area of the second side surface 113 can also be other ratios, for example, the ratio of the area occupied by the dot pattern NP to the area of the second side surface 113 falls within 20 % to 30% is preferred, but the utility model is not limited thereto. Those skilled in the art can determine the appropriate ratio of the area occupied by the dot pattern NP to the area ratio of the second side surface 113 according to actual needs (that is, the width W1 of the area with the dot pattern NP and the area not coated with the dot pattern NP The ratio of the width W2), which will not be repeated here. In addition, those skilled in the art can also determine the color density of the blue ink according to actual needs, which will not be repeated here.

In addition, in this embodiment, the dot pattern NP can also be located on the first side surface 112 or the third side surface 114 . And, likewise, in this embodiment, the ratio of the area occupied by the dot pattern NP to the area of the first side surface 112 or the third side surface 114 falls within the range of 20% to 30%, but the utility model is not limited to this. Those skilled in the art can determine the appropriate ratio of the area occupied by the network dot pattern NP to the area ratio of the first side surface 112 according to actual needs, or determine the appropriate ratio of the area occupied by the network dot pattern NP to the area ratio of the third side surface 114, I won't go into details here.

In this way, as shown in FIG. 2A , when the light emitting element 120 emits light, the light beam 60 can enter the light guide plate 110 from the light incident surface 111 and travel through the light guide plate 110 with total reflection. Moreover, there may also be a scattering microstructure (not shown) on the bottom surface of the light guide plate 110 to destroy the total reflection phenomenon of the light beam 60 and make the light beam 60 leave the light guide plate 110 . On the other hand, the light source module 100 can also reflect the light beam 60 back to the light guide plate 110 through the reflecting unit 130 located under the light guide plate 110 , and then make the light beam 60 leave the light guide plate 110 . At this time, the halftone dot pattern NP disposed on the second side surface 113 may enhance the intensity of the blue light traveling with total reflection in the light guide plate 110 and transmitted to the light beam 60 on the second side surface 113 . In this way, the light beam 60 reflected by the dot pattern NP and leaving the light guide plate 110 can also be biased towards blue, which can improve the yellowing phenomenon of the screen position far away from the light emitting element 120, and further make the white light of the light source module 100 have good color uniformity Spend.

In addition, as shown in FIG. 2B , the dot pattern NP provided on the first side surface 112 or the third side surface 114 can be strengthened to travel with total reflection in the light guide plate 110 and be transmitted to the first side surface 112 or the third side. The intensity of the blue light of beam 60 on surface 114 . In this way, the light beam 60 reflected by the dot pattern NP and leaving the light guide plate 110 can also be biased toward blue, which can improve the yellowing phenomenon of the screen position far away from the light emitting element 120, so that the white light of the light source module 100 has a good color Evenness.

It should be noted that, in the foregoing embodiments, although the dot pattern NP of the light source module 100 is striped as an example, the present invention is not limited thereto. In other embodiments, the dot pattern NP can also be in other shapes. The following will be further explained in conjunction with FIG. 3A to FIG. 3B .

3A to 3B are partial schematic diagrams of different dot patterns. Please refer to FIG. 3A to FIG. 3B , in this embodiment, the dot pattern NP can also be circular (as shown in FIG. 3A ) or polygonal (as shown in FIG. 3B ). Furthermore, in this embodiment, when the light is reflected by the dot pattern NP, the intensity of the blue light in the light beam 60 will be enhanced. In this way, the light beam 60 reflected by the dot pattern NP and leaving the light guide plate 110 can also be biased towards blue, so it can also improve the yellowing phenomenon of the screen position far away from the light emitting element 120, and can be applied to the light source module of the foregoing embodiment. 100, and make the white light of the light source module 100 have good color uniformity. In other words, the present invention does not limit the pattern of the dot pattern NP, and those skilled in the art can determine a suitable dot pattern NP according to actual needs, so details will not be described here.

In summary, the embodiments of the present invention can achieve at least one of the following advantages or effects. In the light source module of the embodiment of the present invention, a plurality of dot patterns are arranged on at least one side surface of the light guide plate. When the light is reflected by the dot patterns, the intensity of the blue light in the light beam will be enhanced. In this way, the light beam reflected by the dot pattern and exiting the light guide plate can also be biased towards blue, which can improve the yellowing phenomenon of the screen position far away from the light emitting diodes, so that the white light of the light source module has good color uniformity.

The above description is only a preferred embodiment of the utility model, when the scope of implementation of the utility model cannot be limited with this, that is, all simple equivalent changes and modifications made according to the claims of the utility model and the contents of the description still belong to The scope covered by the utility model patent. In addition, any embodiment or claim of the utility model does not need to achieve all the purposes, advantages or features disclosed in the utility model. In addition, the abstract and the name of the utility model are only used to assist the retrieval of patent documents, and are not used to limit the scope of rights of the utility model. In addition, terms such as "first" and "second" mentioned in the specification or claims are only used to name elements or to distinguish different embodiments or ranges, and are not used to limit the number of elements. upper or lower limit.

Claims (14)

1. A light source module, comprising a light guide plate and at least one light emitting element, The light guide plate has a light incident surface, a first side surface, a second side surface and a third side surface, wherein the second side surface is opposite to the light incident surface, and the first side surface The second side surface and the light incident surface are connected to the third side surface, and the light guide plate includes: A plurality of dot patterns located on at least one of the first side surface, the second side surface and the third side surface, and the areal density of the plurality of dot patterns is uniform; The at least one light emitting element is located beside the light incident surface. 2. The light source module according to claim 1, wherein the plurality of dot patterns are located on the second side surface. 3 . The light source module according to claim 2 , wherein the ratio of the area occupied by the plurality of dot patterns to the area of the second side surface falls within a range of 20% to 30%. 4 . 4. The light source module according to claim 1, wherein the plurality of dot patterns are located on the first side surface or the third side surface. 5. The light source module according to claim 4, wherein the ratio of the area occupied by the plurality of dot patterns to the area of the first side surface or the third side surface falls within 20% to 30%. within range. 6. The light source module according to claim 1, wherein the plurality of dot patterns are blue. 7. The light source module according to claim 1, wherein the plurality of dot patterns are strips, circles or polygons. 8. A light guide plate, having a light incident surface, a first side surface, a second side surface and a third side surface, wherein the second side surface is opposite to the light incident surface, and the first One side surface and the third side surface are connected to the second side surface and the light incident surface, and the light guide plate includes: A plurality of dot patterns are located on at least one of the first side surface, the second side surface and the third side surface, and the area density of the plurality of dot patterns is uniform. 9. The light guide plate according to claim 8, wherein the plurality of dot patterns are located on the second side surface. 10 . The light guide plate according to claim 9 , wherein the ratio of the area occupied by the plurality of dot patterns to the area of the second side surface falls within a range of 20% to 30%. 11 . 11. The light guide plate according to claim 8, wherein the plurality of dot patterns are located on the first side surface or the third side surface. 12. The light guide plate according to claim 11, wherein the ratio of the area occupied by the plurality of dot patterns to the area of the first side surface or the third side surface falls within 20% to 30%. within range. 13. The light guide plate according to claim 8, wherein the plurality of dot patterns are blue. 14. The light guide plate according to claim 8, wherein the plurality of dot patterns are striped, circular or polygonal.