DE202018107096U1 - Surface light source module and display device - Google Patents

Abstract

A surface light source module comprising: at least one light source assembly, each light source assembly comprising: a substrate; a light guide plate disposed below the substrate, the light guide plate having a first surface and a second surface facing each other, the first surface having a reflective structure and a plurality of diffused microstructures, and wherein the second surface is opposite to the substrate; anda point light source disposed on a side of the substrate and facing the reflective structure of the lightguide plate, the point light source configured to emit a light and to reflect the light from the reflective structure.

Description

FIELD OF THE INVENTION

The invention relates to a light source module, and more particularly to a surface light source module and a display device using the surface light source module.

BACKGROUND OF THE INVENTION

A liquid crystal display device comprises a liquid crystal display panel and a backlight module. Since the liquid crystal display panel itself does not emit light, it is necessary to provide an indicator light source to the liquid crystal display panel by means of the backlight module. Therefore, a major function of the backlight module is to provide a display light source with high brightness and high uniformity.

The backlight module may be conventionally divided into a side backlight module and a direct backlight module. In general, since a light source of the side backlight module is disposed on one side of a light guide plate, it has the advantage of a smaller thickness. Since a light source of the direct backlight module is located under an optical disk, it generally has the advantage of better uniformity and is suitable for dynamic local dimming. Due to the need for a larger Lichtmischabstandes the total thickness is larger.

The information disclosed in this Background of the Invention section is only for enhancement of understanding of the background of the invention and thus may include information that does not form the prior art that is already known to those skilled in the art. Moreover, the information disclosed in this Background of the Invention section does not imply that one or more problems to be solved by one or more embodiments of the invention have been recognized by those skilled in the art.

SUMMARY OF THE INVENTION

The invention provides a surface light source module that is suitable for dynamic local dimming and can solve the problem that a thickness of a conventional direct backlight module is larger.

The invention provides a display device which can have a function of dynamic local dimming and has the advantage of a smaller thickness.

Other objects and advantages of the invention will be better understood from the technical features disclosed in the invention.

In order to accomplish an object or part of the object (s) and other objects, the surface light source module provided by an embodiment of the invention includes at least one light source assembly. Each light source assembly includes a substrate, a light guide plate, and a point light source. The lightguide plate is disposed below the substrate and has a first surface and a second surface that face each other. The first surface has a reflective structure and a plurality of diffused microstructures. The second surface faces the substrate. The point light source is disposed on a side of the substrate and faces the reflective structure of the light guide plate. The point light source is configured to emit a light, the light being reflected by the reflective structure.

In one embodiment of the invention, the second surface has a receiving recess opposite the reflecting structure. The point light source is housed in the receiving recess.

In one embodiment of the invention, the substrate completely covers the second surface of the light guide plate and the substrate is translucent.

In one embodiment of the invention, the substrate completely covers the second surface of the light guide plate and the substrate has a plurality of through holes.

In one embodiment of the invention, pore sizes of the through holes are identical. Distribution densities of the through holes gradually increase from a position near the point light source in a direction away from the point light source.

In one embodiment of the invention, distribution densities of the through holes are the same. Pore sizes of the through holes gradually increase from a position near the point light source in a direction away from the point light source.

In one embodiment of the invention, a reflective layer is disposed on one side of the substrate opposite to the light guide plate. A heat sink layer is disposed on a side of the substrate away from the light guide plate.

In one embodiment of the invention, distribution densities of the diffused microstructures gradually increase from a location close to the reflective structure in a direction away from the reflective structure.

In one embodiment of the invention, the reflective structure has a pyramidal, conical or circular shape.

In one embodiment of the invention, a number of the at least one light source array is a plurality. The surface light source module further includes a frame for mounting and disconnecting the light source assemblies.

In one embodiment of the invention, each of the light source assemblies further includes a reflective plate disposed below the light guide plate.

In one embodiment of the invention, each of the light source assemblies further comprises an optical film disposed above the substrate.

In order to achieve a task or a part of the object (s) and other objects, an embodiment of the invention provides a display device comprising a display panel and the surface light source module. The display panel is disposed on a light exit side of the surface light source module.

In the surface light source module of the embodiment of the invention, the point light source of each light source array is disposed above the light guide plate. The light emitted from the point light source is reflected by the reflecting structure of the light guide plate, so that the light is directed toward the vicinity of the light guide plate. The uniformity of the light emerging from the lightguide plate is adjusted by the diffuse microstructures. Compared with a conventional direct backlight module, the surface light source module of the embodiment of the invention has the advantage of less thickness through the use of the point light source emitting down light from above the light guide plate and the associated arrangement of the reflective structure and diffused microstructures. Since the point light source is located above the lightguide plate, splicing of a plurality of light source arrays is facilitated, and the dynamic local dimming function can be achieved.

Other objects, features and advantages of the invention will be further understood from the further technological features disclosed by the embodiments of the invention, which are illustrated and described in terms of the preferred embodiments of the invention, simply to illustrate the most appropriate to the practice of the invention modes.

list of figures

• 1 ist eine schematische Draufsicht auf ein Oberflächenlichtquellenmodul einer Ausführungsform der Erfindung;
• 2 ist eine schematische Querschnittsansicht einer Lichtquellenanordnung aus 1;
• 3 ist eine schematische Querschnittsansicht einer Lichtquellenanordnung eines Oberflächenlichtquellenmoduls einer anderen Ausführungsform der Erfindung;
• 4 ist eine schematische Querschnittsansicht einer Lichtquellenanordnung eines Oberflächenlichtquellenmoduls einer anderen Ausführungsform der Erfindung;
• 5 ist ein schematisches Diagramm eines Ausführungsaspekts von Durchgangslöchern eines Substrats aus 4;
• 6 ist ein schematisches Diagramm eines weiteren Ausführungsaspekts von Durchgangslöchern eines Substrats von 4; and
• 7 ist ein schematisches Diagramm einer Anzeigevorrichtung einer Ausführungsform der Erfindung.

The accompanying drawings are included to provide a better understanding of the invention and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

• 1 Fig. 12 is a schematic plan view of a surface light source module of an embodiment of the invention;
• 2 is a schematic cross-sectional view of a light source arrangement 1 ;
• 3 Fig. 12 is a schematic cross-sectional view of a light source assembly of a surface light source module of another embodiment of the invention;
• 4 Fig. 12 is a schematic cross-sectional view of a light source assembly of a surface light source module of another embodiment of the invention;
• 5 FIG. 12 is a schematic diagram of an embodiment aspect of through holes of a substrate. FIG 4 ;
• 6 FIG. 12 is a schematic diagram of another embodiment of through holes of a substrate of FIG 4 ; and
• 7 Fig. 10 is a schematic diagram of a display device of one embodiment of the invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. In this connection, directional terminology such as "top", "bottom", "front", "rear", etc. is used with respect to the orientation of the figure (s) described. The components of the invention may be positioned in different orientations. Therefore, the directional terminology is used for illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of the components may be exaggerated for clarity. It is understood that Other embodiments may be used and structural changes may be made without departing from the scope of the invention. It is also to be understood that the phraseology and terminology used herein are intended to be descriptive rather than limiting. The use of "including,""comprising," or "having" and variations thereof is intended to encompass the elements listed below and their equivalents as well as additional elements. Unless otherwise indicated, the terms "connected,""coupled," and "mounted," as well as variations thereof, are used broadly and include direct and indirect connections, couplings, and mounts. Similarly, the terms "adjacent", "opposite" and variations thereof are used broadly herein to encompass direct and indirect neighborhoods, and "contiguous" and variations thereof are used broadly herein to encompass directly and indirectly "contiguous". Thus, the description of the "A" component opposite the "B" component may include the situations where the "A" component is directly opposite the "B" component, or one or more additional components between the "B" component. A "component and the" B "component lie. Also, the description of the "A" component "adjacent to" the "B" component may include the situations that the "A" component is directly "adjacent to" the "B" component or one or more additional components between the "A" component and the "B" component lie. Accordingly, the drawings and descriptions are considered as illustrative in nature and not as restrictive.

1 FIG. 12 is a schematic plan view of a surface light source module of an embodiment of the invention. FIG. 2 is a schematic cross-sectional view of a light source arrangement 1 , It will be up first 1 Referenced. A surface light source module 10 The embodiment comprises at least one light source arrangement 100 , 1 takes as an example four light source arrangements 100 , The light source arrangements 100 can emit light independently of each other so that the function of dynamic local dimming can be achieved. In addition, the surface light source module 10 continue a frame 101 for fastening and separating the light source arrangements 100 include. The frame 101 can block the light further, leaving the light of each light source assembly 100 Interference between them can be avoided. A material of the frame 101 may be plastic or other material suitable for shading or reflecting light. Even though 1 four light source arrangements 100 As an example, the number of light source arrangements can be 100 in other embodiments, one or more.

It will be up now 2 Referenced. The light source arrangement 100 includes a substrate 110 , a light guide plate 120 and a point light source 130 , The light guide plate 120 is under the substrate 110 arranged and has a first surface 121 and a second surface 122 on, which are opposite each other. The second surface 122 is the substrate 110 facing. The first surface 121 has a reflective structure 123 and a variety of diffuse microstructures 124 on. The point light source 130 is on one side of the substrate 110 arranged and lies the reflective structure 123 the light guide plate 120 across from.

The substrate 110 For example, it is a printed circuit board and may be a hard plate or a soft plate for supporting the point light source 130 be. The point light source 130 is powered to light through the substrate 110 to emit. The hard disk is, for example, a metal core board (MCPCB) or a copper foil substrate (eg, an FR4 substrate). In addition, a reflective layer 111 on one side of the substrate 110 be arranged, the light guide plate 120 is facing. The reflective layer 111 may be a highly reflective white lacquer layer. A heat dissipation layer 112 can be on one side of the substrate 110 away from the light guide plate 120 be arranged to heat dissipation of the point light source 130 to facilitate. In one embodiment, the substrate 110 a translucent substrate.

The point light source 130 is used to provide a light L used. A light emitting diode (LED) can be used for the point light source 130 but the invention does not limit the type of light source. The point light source 130 is, for example, a Lambert light source.

In the embodiment, the second surface 122 the light guide plate 120 for example, a recording recess 125 opposite the reflective structure 123 on. The point light source 130 is for example in the recording recess 125 housed, so that a thickness of the light source assembly 100 can be reduced. In a further embodiment, the second surface 122 not even the recording cutback 125 and the point light source 130 is located above the second surface 122 , In addition, the reflective structure 123 For example, a concave structure and has a variety of reflective surfaces 126 on. The reflective surfaces 126 can do that from the point light source 130 emitted light L from a transmission down to a transmission to the environment of the light guide plate 120 judge. In one embodiment, the reflective structure 123 further be a symmetric concave structure, eg a pyramidal, conical or circular shape, etc., so that the light L can be reflected more uniformly to the environment. However, the invention limits a shape of the reflective structure 123 not a. The shape of the reflective structure 123 can be customized according to the design requirements.

In the embodiment, the diffused microstructures 124 Be points or other microstructures that disperse the light. The distribution densities of the diffuse microstructures 124 For example, take from a location near the reflective structure 123 in a direction away from the reflective structure 123 gradually closed. The overall uniformity of the leaked light of the second surface 122 the light guide plate 120 is adjustable. The distribution densities of the diffuse microstructures 124 can be customized according to the different design requirements.

The light source arrangement 100 further includes, for example, a reflective plate 140 under the light guide plate 120 is arranged to the bottom of the light guide plate 120 escaping light back into the light guide plate 120 to reflect, to increase the luminous efficacy. In addition, the light source arrangement 100 continue an optical film 150 include that over the substrate 110 is arranged to the uniformity of the outgoing light of the light source assembly 100 to increase.

In the surface light source module 10 the embodiment, since the point light source 130 each light source arrangement 100 over the light guide plate 120 is arranged, that of the point light source 130 provided light L from the reflective structure 123 the light guide plate 120 reflected, so the light L in the direction of the environment of the light guide plate 120 is transmitted. The uniformity of the leaked light of the light guide plate 120 is due to the diffuse microstructures 124 set. A point light source of a conventional direct backlight module is placed under a lightguide plate and provides light upwards. Such a configuration requires a larger blending distance to avoid uneven emergent light. The surface light source module 10 The embodiment uses the point light source 130 that over the light guide plate 120 is arranged and the light L gives down. By the arrangement of the reflective structure 123 and the diffuse microstructures 124 that are on the first surface 121 the light guide plate 120 the light will be L reflected and on the second surface 122 the light guide plate 120 scattered and emitted. Therefore, the surface light source module has 10 In the embodiment, the characteristic of longer light transmission paths compared to a conventional direct backlight module. A thinner light guide plate can thus be used to achieve the same or similar effect as a conventional direct backlight module. Therefore, the surface light source module has 10 the embodiment of the advantage of a thinner thickness. Because the point light sources 130 can each independently emit light and above the light guide plate 120 are arranged, the function of the dynamic local dimming is facilitated when a plurality of light source arrangements 100 spliced.

3 Fig. 12 is a schematic cross-sectional view of a light source assembly of a surface light source assembly of another embodiment of the invention. It will be on the 3 Referenced. A light source arrangement 100a The embodiment is similar to the light source arrangement 100 , The main difference is that a substrate 110a the light source arrangement 100a Embodiment, the second surface 122 the light guide plate 120 completely covered and translucent. Thus, the light L penetrates the substrate 110a and after leaving the second surface 122 the light guide plate 120 headed upwards.

4 Fig. 12 is a schematic cross-sectional view of a surface light source arrangement of another embodiment of the invention. It will open 4 Referenced. A light source arrangement 100b The embodiment is similar to the light source arrangement 100 out 1 , The main difference is that a substrate 110b the light guide plate 120 completely covered and a variety of through holes 113 having. The material of the substrate 110b itself is not translucent. The light L can pass through the through holes 113 happen. A number, positions and pore sizes of the through holes 113 can work together with the diffused microstructures 124 Overall, be designed so that one of the through holes 113 emerging surface light source may have better uniformity and luminance. The following are possible implementation aspects of the through holes 113 illustrated by examples, but the invention is not limited thereto.

5 FIG. 12 is a schematic diagram of an embodiment aspect of through holes of a substrate. FIG 4 , It will open 5 Referenced. The pore sizes of the through holes 113 of the substrate 110b are identical, for example. The distribution densities of the through holes 113 Take, for example, from a point near the point light source 130 in a direction away from the point light source 130 Gradually closed to adjust the uniformity of the exiting light.

6 FIG. 12 is a schematic diagram of another embodiment of through holes of a substrate of FIG 4 , It will open 6 Referenced. The distribution densities of the through holes 113 on the substrate 110b For example, they are the same, ie the through holes 113 are about evenly on the entire substrate 110b distributed. The pore sizes of the through holes 113 however, take from a location near the point light source 130 in a direction away from the point light source 130 gradually too. This is another way to adjust the uniformity of the leaked light.

7 FIG. 12 is a schematic cross-sectional view of a display device of one embodiment of the invention. FIG. It will open 7 Referenced. A display device 200 The embodiment includes the surface light source module 10 and a scoreboard 210 , The scoreboard 210 is at a light exit side of the surface light source module 10 arranged. The scoreboard 210 may be a liquid crystal display panel or other non-self-luminous display panel. The surface light source module 10 is used to the scoreboard 210 a surface light source L1 to provide as an indicator light source. A light source arrangement of the surface light source module 10 For example, the light source device may be any of the above embodiments. The number of light source arrangements may be one or more. Because the surface light source module 10 the display device 200 of the embodiment can achieve a function of the dynamic dimming with thinner thickness, the total thickness of the display device 200 be reduced.

In summary, it is noted that in the surface light source module of the embodiment of the invention, the point light source is accommodated in the receiving recess of the light guide plate and discharges light from above the light guide plate downward. Accompanied by the reflecting structure and the diffused microstructures, the problem that a thickness of a conventional direct surface light source module is too thick can be solved. Since the point light source is located above the lightguide plate, splicing of a plurality of light source arrays is facilitated. This can be used to achieve a function of dynamic local dimming. When this surface light source module is applied to a display device, a display device having the dynamic local dimming function and the smaller thickness can be achieved.

Claims (13)

A surface light source module comprising: at least one light source assembly, each light source assembly comprising: a substrate; a light guide plate disposed under the substrate, the light guide plate having a first surface and a second surface facing each other, the first surface having a reflective structure and a plurality of diffused microstructures, and the second surface facing the substrate; and a point light source disposed on a side of the substrate and facing the reflective structure of the lightguide plate, the point light source being configured to emit a light and to reflect the light from the reflective structure. The surface light source module according to Claim 1 wherein the second surface has a receiving recess opposite to the reflective structure, and the point light source is housed in the receiving recess. The surface light source module according to Claim 1 or 2 wherein the substrate completely covers the second surface of the lightguide plate, and wherein the substrate is translucent. The surface light source module according to Claim 1 . 2 or 3 wherein the substrate completely covers the second surface of the light guide plate, and wherein the substrate has a plurality of through holes. The surface light source module according to Claim 4 wherein pore sizes of the plurality of through holes are identical, and distribution densities of the plurality of through holes gradually increase from a location near the point light source in a direction away from the point light source. The surface light source module according to Claim 4 or 5 wherein distribution densities of the plurality of through holes are the same, and pore sizes of the plurality of through holes gradually increase from a location near the point light source in a direction away from the point light source. The surface light source module according to Claim 4 . 5 or 6 wherein a reflective layer is disposed on a side of the substrate opposite to the light guide plate, and a heat dissipation layer is disposed on a side of the substrate away from the light guide plate. The surface light source module according to claim 1, wherein distribution densities of the plurality of diffused microstructures gradually increase from a position close to the reflective structure in a direction away from the reflective structure. The surface light source module according to any one of the preceding claims, wherein the reflective structure has a pyramidal, conical or circular shape. The surface light source module of claim 1, wherein a number of the at least one light source array is a plurality, and the surface light source module further comprises a frame for mounting and disconnecting the light source arrays. The surface light source module of any one of the preceding claims, wherein each of the light source assemblies further comprises a reflective plate disposed below the light guide plate. The surface light source module of any one of the preceding claims, wherein each of the light source assemblies further comprises an optical film disposed above the substrate. A display device, comprising: a surface light source module according to any one of Claims 1 to 12 ; and a display panel disposed on a light exit side of the surface light source module.

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