CN201903665U - Light guide plate and backlight module - Google Patents

Abstract

A light guide plate and a backlight module are provided, the light guide plate comprises a light incident surface, a light emergent surface, a bottom surface, a plurality of lattice point microstructures, a plurality of arc spacers and a plurality of columnar lenses. The lattice point microstructure and the arc spacer are formed on the bottom surface, and the cylindrical lens is formed on the light-emitting surface. The height of each arc spacer relative to the bottom surface is greater than that of each lattice point microstructure relative to the bottom surface, and each arc spacer has a section shape of an arc surface or an elliptic arc surface. The backlight module comprises the light guide plate.

Description

Light guide plate and backlight module

【Technical field】

The utility model relates to a light guide plate and a backlight module with the light guide plate.

【Background technique】

FIG. 6 is a schematic diagram of a conventional backlight module. As shown in FIG. 6 , the backlight module 100 includes a light source 102 , a light guide plate 104 , an optical film set 106 and a reflector 108 . The light source 102 is adapted to provide a light beam, and the light guide plate 104 is adapted to guide the light beam provided by the light source 102 . Due to the improvement of processing precision, the dot etching depth of the current general-purpose light guide plate can reach 1-5 microns. Therefore, the height d of the dot microstructure 110 on the light guide plate 104 is only about 1-5 microns, so that the space between the light guide plate 104 and the reflection sheet 108 is extremely small, so that the light guide plate 104 is easy to rub and scratch the reflection sheet 108 (such as 7) or adsorb the reflective sheet 108 (as shown in FIG. 8), resulting in poor image performance.

Among other existing designs, Taiwan Patent Publication No. I292845 discloses a light guide plate including reflective dots and reflective lines, and the reflective dots and reflective lines are arc-shaped convex structures. China Taiwan Patent Publication No. M358989 discloses a light-transmitting substrate with prism columns of different heights. Taiwan Patent Publication No. 200846730 discloses that the light-emitting surface of the light guide plate can form a plurality of arc-shaped structures to eliminate bright lines, and Taiwan Patent Publication No. M350026 discloses that the light-emitting surface of the light guide plate can be provided with a plurality of cylindrical lenses to avoid bright spots.

【Content of utility model】

The utility model provides a light guide plate capable of avoiding scratching or absorbing a reflection sheet and a backlight module comprising the light guide plate.

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 purposes or other purposes, an embodiment of the present invention provides a light guide plate, which includes a light incident surface, a light exit surface, a bottom surface, a plurality of dot microstructures, a plurality of Arc-shaped spacers and a plurality of cylindrical lenses. The light incident surface is arranged adjacent to the light source, the light exit surface is connected to the light incident surface and forms an angle with the light incident surface, and the bottom surface is connected to the light incident surface and is set opposite to the light exit surface. The dot microstructure and the arc-shaped spacers are formed on the bottom surface, the height of each arc-shaped spacer relative to the bottom surface is greater than the height of each dot micro-structure relative to the bottom surface, and each arc-shaped spacer has a cross-section of an arc surface or an elliptical arc surface shape. The lenticular lenses are formed on the light emitting surface, the lenticular lenses are arranged along a first direction and extend along a second direction, and the first direction and the second direction are substantially perpendicular.

In one embodiment, each arc-shaped spacer is arranged along a first direction and extends along a second direction, wherein the first direction is substantially perpendicular to the light incident surface and the second direction is substantially parallel to the light incident surface, and each arc The length of the spacer in the second direction is substantially equal to the length of the light incident surface.

In one embodiment, each arc-shaped spacer is arranged along a first direction and extends along a second direction, the first direction is substantially parallel to the light incident surface and the second direction is substantially perpendicular to the light incident surface.

In one embodiment, every two adjacent arc-shaped spacers have a pitch, and the pitches of these arc-shaped spacers are the same as each other.

In one embodiment, the arc-shaped spacers are formed on the bottom surface in random distribution, and the length of each arc-shaped spacer in the second direction is greater than the length in the first direction.

In one embodiment, two adjacent lenticular lenses are connected to each other or have a distance therebetween.

In the light guide plate, the height of each of the arc-shaped spacers relative to the bottom surface is greater than 5 microns.

Another embodiment of the present invention provides a backlight module, which includes at least one light source, a light guide plate, an optical film set, and a reflection sheet. The light guide plate includes a light incident surface, a light exit surface, a bottom surface, a plurality of dot microstructures, a plurality of arc-shaped spacers and a plurality of cylindrical lenses. The light incident surface is arranged adjacent to the light source, the light exit surface is connected to the light incident surface and forms an angle with the light incident surface, and the bottom surface is connected to the light incident surface and is set opposite to the light exit surface. The dot microstructure and the arc-shaped spacers are formed on the bottom surface, the height of each arc-shaped spacer relative to the bottom surface is greater than the height of each dot micro-structure relative to the bottom surface, and each arc-shaped spacer has a cross-section of an arc surface or an elliptical arc surface shape. The lenticular lenses are formed on the light emitting surface, the lenticular lenses are arranged along a first direction and extend along a second direction, and the first direction and the second direction are substantially perpendicular. The optical film group is arranged at a position adjacent to the light-emitting surface, and the reflection sheet is arranged at a position adjacent to the bottom surface.

In the backlight module, the optical film set includes a diffusion sheet and a brightness enhancement sheet.

To sum up, the light guide plate and the backlight module of the embodiment of the present invention have at least one of the following advantages:

With the design of the above-mentioned embodiment, a plurality of arc-shaped spacers are formed on the bottom surface of the light guide plate and distributed between the dot microstructures in a regular or random distribution manner, which can increase the space between the light guide plate and the reflector, and effectively reduce the light guide plate. Adsorption or friction between reflectors and reflectors, and improve image performance and product yield. In addition, the arc-shaped spacer has a smooth arc shape at the top, which can avoid scratching the reflector, and the astigmatism effect provided by the cylindrical lens on the light-emitting surface can atomize the arc-shaped spacer itself in the picture The formed light cluster can make the light cluster disappear, and at the same time, it can also eliminate the bright spots formed on the screen by other foreign objects and ejected dander.

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

【Description of drawings】

FIG. 1 is a schematic side view of a backlight module according to an embodiment of the present invention.

FIG. 2 is a three-dimensional schematic diagram of the backlight module in FIG. 1 .

FIG. 3 is a three-dimensional schematic diagram of a backlight module according to another embodiment of the present invention.

FIG. 4 is a schematic diagram of an arc-shaped spacer according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of an arc-shaped spacer according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of a conventional backlight module.

FIG. 7 is a schematic diagram illustrating the friction phenomenon between the conventional light guide plate and the reflection sheet.

FIG. 8 is a schematic diagram illustrating the adsorption phenomenon between the conventional light guide plate and the reflection sheet.

10 backlight module 32 diffuser

12 light source 34 brightening sheet

14 Light guide plate 100 Backlight module

14a Light incident surface 102 Light source

14b Light-emitting surface 104 Light guide plate

14c Bottom 106 Optical film set

16 Optical diaphragm group 108 Reflector

18 reflector 110 dot microstructure

22 Dot microstructure T pitch

24 arc spacer d, h, H height

26 lenticular lens

【Detailed ways】

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

Fig. 1 is a schematic side view of a backlight module according to an embodiment of the present invention, and Fig. 2 is a schematic perspective view of the backlight module of Fig. 1, wherein Fig. 2 clearly shows the structure formed on the light guide plate, and Fig. 1 is omitted part of the optical components. Please refer to FIG. 1 and FIG. 2 at the same time. The backlight module 10 includes at least one light source 12 , a light guide plate 14 , an optical film set 16 and a reflector 18 . The light source 12 is adapted to provide a light beam, and the light guide plate 14 is adapted to guide the light beam provided by the light source 12 . The light guide plate 14 has a light incident surface 14a, a light exit surface 14b and a bottom surface 14c. The light incident surface 14 a is disposed adjacent to the light source 12 , and the light exit surface 14 b is connected to the light incident surface 14 a and forms an angle with the light incident surface 14 a. The bottom surface 14c is connected to the light incident surface 14a and is disposed opposite to the light exit surface 14b. The optical film set 16 is disposed adjacent to the light-emitting surface 14 b , and the optical film set 16 may include, for example, a diffusion sheet 32 and a brightness enhancement sheet 34 . The reflection sheet 18 is disposed adjacent to the bottom surface 14c. A plurality of grid dot microstructures 22 are formed at least on the bottom surface 14c. The grid dot microstructures 22 can deflect the light beam entering the light guide plate 14 from the light incident surface 14a, so that the light beam can exit from the light exit surface 14b. The dot microstructure 22 can be used to cover the bottom surface 14 c of the light guide plate 14 by sandblasting, laser or other processes, for example. A plurality of arc-shaped spacers 24 are formed on the bottom surface 14c, and are distributed among the dot microstructures 22 in a regular or random distribution manner. In this embodiment, the height H of each arc-shaped spacer 24 relative to the bottom surface 14c is greater than the height h of each dot microstructure 22 relative to the bottom surface 14c. For example, the height h of the grid dot microstructure 22 formed under the current high-precision process can only be about 1-5 microns, so the height H of the arc-shaped spacers 24 can be set to be greater than 5 microns. The space between the light guide plate 14 and the reflective sheet 18 can be increased by the spacing effect of the arc-shaped spacer 24 , effectively reducing the situation that the light guide plate 14 rubs and scratches the reflective sheet 18 or absorbs the reflective sheet 18 . Furthermore, in this embodiment, a plurality of lenticular lenses 26 are arranged on the light-emitting surface 14b in a direction substantially perpendicular to the light-incident surface 14a and extend in a direction substantially parallel to the light-incidence surface 14a, and each arc-shaped spacer 24 is along the The direction substantially perpendicular to the light incident surface 14 a is arranged, and each arc-shaped spacer 24 extends along a direction substantially parallel to the light incident surface 14 a. Furthermore, each arc-shaped spacer 24 may, for example, extend to a length substantially equal to the light-incident surface 14a. Likewise, each lenticular lens 26 may, for example, extend to a length substantially equal to the light incident surface 14a.

In another embodiment, as shown in FIG. 3, a plurality of lenticular lenses 26 may be arranged on the light-emitting surface 14b along a direction substantially parallel to the light-incidence surface 14a and extend along a direction substantially perpendicular to the light-incidence surface 14a. Each arc The shaped spacers 24 are arranged along a direction substantially parallel to the light incident surface 14a, and each arc-shaped spacer 24 extends along a direction substantially perpendicular to the light incident surface 14a.

As shown in FIG. 4 , two adjacent arc-shaped spacers 24 may have a distance T to provide space for optical adjustment, and each distance T may be the same or different from each other. Furthermore, a stronger supporting force can be provided by increasing the length of the arc-shaped spacer 24 in the direction perpendicular to the light-incident surface 14a. The arc-shaped spacer 24 may have, for example, a cross-sectional profile of an arc surface. In another embodiment, as shown in FIG. 5 , each arc-shaped spacer 24 is distributed among the dot microstructures 22 in a random number distribution manner, and the arc-shaped spacer 24 may have a cross-sectional shape of an elliptical arc. In this embodiment, the length of each arc spacer 24 in the direction parallel to the light incident surface 14a is greater than the length in the direction perpendicular to the light incident surface 14a. The length in the direction provides strong support. In another embodiment, the length of each arc-shaped spacer 24 in the direction perpendicular to the light-incident surface 14a may also be greater than the length in the direction parallel to the light-incident surface 14a. The curved spacer 24 in each of the above embodiments has a rounded curved shape at the top, which can avoid scratching the reflective sheet 18 .

Please refer to FIG. 1 again, because the arc-shaped spacer 24 itself is easy to form a light cluster in the screen and thus affects the visual effect, the astigmatism effect provided by the arrangement of the cylindrical lens 26 on the light-emitting surface 14b can atomize the arc-shaped spacer 24 The light group formed by itself in the picture can make the light group disappear and also eliminate other foreign objects and the bright spots formed on the picture by emitting dander. The arrangement of the lenticular lenses 26 on the light-emitting surface 14 b is not limited, for example, two adjacent lenticular lenses 26 may be connected to each other or have a distance therebetween.

In summary, the light guide plate and the backlight module of the embodiments of the present invention have at least one of the following advantages:

With the design of the above-mentioned embodiment, a plurality of arc-shaped spacers are formed on the bottom surface of the light guide plate and distributed between the dot microstructures in a regular or random distribution manner, which can increase the space between the light guide plate and the reflective sheet, and effectively reduce the light guide plate. Adsorption or friction between reflectors and reflectors can improve image performance and product yield. In addition, the arc-shaped spacer has a smooth arc shape at the top, which can avoid scratching the reflector, and the astigmatism effect provided by the cylindrical lens on the light-emitting surface can atomize the arc-shaped spacer itself in the picture The formed light cluster can make the light cluster disappear, and at the same time, it can also eliminate the bright spots formed on the screen by other foreign objects and ejected dander.

The above is only a preferred embodiment of the utility model, and should not limit the scope of implementation of the utility model with this, that is, all simple equivalent changes and modifications made according to the patent scope of the utility model and the new description content, All still belong to the scope that this new patent covers. In addition, any embodiment of the utility model or the scope of the patent application does not need to achieve all the purposes or advantages or features disclosed in the utility model.

Claims (19)

1. a light guide plate is suitable for guiding the light beam that at least one light source provides, and it is characterized in that: this light guide plate comprises:

One incidence surface is arranged at contiguous this light source position place;

One exiting surface connects this incidence surface and presss from both sides an angle with this incidence surface;

One bottom surface connects this incidence surface and this exiting surface setting relatively;

A plurality of sites microstructure is formed on this bottom surface;

A plurality of arc septs are formed on this bottom surface, and respectively relatively the height of this bottom surface is greater than the height of this bottom surface relatively of this site microstructure respectively for this arc sept, and respectively this arc sept has the cross-sectional shape of an arc surface or an elliptical arc surface; And

A plurality of lens pillars are formed on this exiting surface, and wherein these lens pillars extend along first direction arrangement and along a second direction, and this first direction is vertical in fact with this second direction.

2. light guide plate as claimed in claim 1 is characterized in that: respectively this arc sept extends along this first direction arrangement and along this second direction.

3. light guide plate as claimed in claim 2, it is characterized in that: this first direction is parallel to this incidence surface in fact perpendicular to this incidence surface and this second direction in fact, and respectively the length of this arc sept on this second direction equals the length of this incidence surface in fact.

4. light guide plate as claimed in claim 2 is characterized in that: this first direction is parallel to this incidence surface and this second direction in fact in fact perpendicular to this incidence surface.

5. light guide plate as claimed in claim 1 is characterized in that: respectively this arc sept in the length on this second direction greater than the length on this first direction.

6. light guide plate as claimed in claim 1 is characterized in that: per two these adjacent arc septs have a spacing, and these spacings of these arc septs are mutually the same.

7. light guide plate as claimed in claim 1 is characterized in that: these arc septs are to be formed on this bottom surface with random number distribution mode.

8. light guide plate as claimed in claim 1 is characterized in that: two these adjacent lens pillars are connected with each other or have a spacing.

9. light guide plate as claimed in claim 1 is characterized in that: respectively the height of relative this bottom surface of this arc sept is greater than 5 microns.

10. module backlight is characterized in that: comprise:

At least one light source is suitable for providing a light beam;

One light guide plate is suitable for guiding this light beam, and this light guide plate comprises:

One incidence surface is arranged at contiguous this light source position place;

One exiting surface connects this incidence surface and presss from both sides an angle with this incidence surface;

One bottom surface connects this incidence surface and this exiting surface setting relatively;

A plurality of sites microstructure is formed on this bottom surface;

A plurality of arc septs are formed on this bottom surface, and respectively relatively the height of this bottom surface is greater than the height of this bottom surface relatively of this site microstructure respectively for this arc sept, and respectively this arc sept has the cross-sectional shape of an arc surface or an elliptical arc surface; And

A plurality of lens pillars are formed on this exiting surface, and wherein these lens pillars extend along first direction arrangement and along a second direction, and this first direction is vertical in fact with this second direction;

One optical diaphragm group is arranged at contiguous this exiting surface position; And

One reflector plate is arranged at contiguous this basal surface position place.

11. module backlight as claimed in claim 10 is characterized in that: this optical diaphragm group comprises a diffusion sheet and a blast sheet.

12. module backlight as claimed in claim 10 is characterized in that: respectively this arc sept extends along this first direction arrangement and along this second direction.

13. module backlight as claimed in claim 12, it is characterized in that: this first direction is parallel to this incidence surface in fact perpendicular to this incidence surface and this second direction in fact, and respectively the length of this arc sept on this second direction equals the length of this incidence surface in fact.

14. module backlight as claimed in claim 12 is characterized in that: this first direction is parallel to this incidence surface and this second direction in fact in fact perpendicular to this incidence surface.

15. module backlight as claimed in claim 10 is characterized in that: respectively this arc sept in the length on this second direction greater than the length on this first direction.

16. module backlight as claimed in claim 10 is characterized in that: per two these adjacent arc septs have a spacing, and these spacings of these arc septs are mutually the same.

17. module backlight as claimed in claim 10 is characterized in that: these arc septs are to be formed on this bottom surface with random number distribution mode.

18. module backlight as claimed in claim 10 is characterized in that: two these adjacent lens pillars are connected with each other or have a spacing.

19. module backlight as claimed in claim 10 is characterized in that: respectively the height of relative this bottom surface of this arc sept is greater than 5 microns.

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