CN200972512Y - Light guide plate and backlight module - Google Patents

Abstract

A light guide plate and a backlight module include a substrate and a plurality of positioning structures. At least one optical film is attached to the substrate, and the plurality of positioning structures are connected to the side surface of the substrate. Each positioning structure forms a slot for engaging the optical film and has a height difference with the substrate, so that the optical film can be pre-combined with the light guide plate to form a modular structure.

Description

Light guide plate and backlight module

technical field

The invention relates to a light guide plate and a backlight module, especially a light guide plate and a backlight module in which the optical film and the light guide plate are modularized.

Background technique

FIG. 1 is an exploded view showing components of a conventional backlight module. As shown in FIG. 1, the backlight module 100 is composed of a positioning frame 102, a light guide plate 104, and a group of stacked optical films 106. The optical film 106 can be, for example, a diffusion film 108, an X-axis prism enhancement film 110a, a Y-axis prism light-increasing sheet 110b is formed, several gaps 112 are formed on the positioning frame 102, and each optical film 106 forms a diaphragm flange 114 corresponding to the position of the gap 112, so as to be inserted into several gaps 112 of the positioning frame 102 Inside, the optical film 106 is horizontally limited in the positioning frame 102 by the alignment effect of the positioning frame notch 112 and the film flange 114 .

However, in this design, when the distance between the top surface 104a of the light guide plate and the top surface 102a of the retaining wall of the positioning frame 102 is too small, it is easy to cause the stacked optical films 106 to slip on the light guide plate 104 and be difficult to assemble. The distance between the top surface 104a of the light board and the top surface 102a of the retaining wall of the positioning frame 102 is to form an allowable margin to facilitate the assembly and placement of each optical film 106, but when the space for storing the optical film 106 is large, each optical film The sheets 106 may not be closely attached to each other due to factors such as burrs, air, sliding, etc., resulting in uneven prism surfaces of the brightness enhancement sheets 110a and 110b, resulting in problems such as Newton's ring phenomenon.

new content

Therefore, the purpose of this invention is to provide a light guide plate and a light guide assembly, which can prevent the optical film from slipping or loosening on the light guide plate, and can maintain the precise positioning of the optical film on the light guide plate.

Another object of the present invention is to provide a backlight module capable of maintaining good flatness of the optical film after assembly.

According to the design of this creation, a light guide plate includes a base plate and several positioning structures, at least one optical film is pasted on the base plate, and the optical film has several corners protruding along the end surface, and the several positioning structures Connected to the surface of the substrate, each positioning structure has a height difference with the substrate, and the connection between the two forms a slot for fitting the corner, and the positioning structure can be composed of a first bump, a second bump and a rib The rib is connected to the first and second protrusions and maintains a gap with the side surface of the light guide plate.

Through the design of this creation, since the side surface of the light guide plate is independently provided with several positioning structures with slots, and the positioning structures are designed to have a height difference from the substrate, so when the flange of the optical film is inserted into the slot, A stable fitting effect can be produced to avoid slipping or loosening of the optical film and maintain the precise positioning of the optical film on the light guide plate.

Furthermore, the invention provides a backlight module, which includes a positioning frame, a reflector, a light guide plate, at least one optical film, a backlight and a light-shielding reflective tape, and the reflector is accommodated in the bearing groove of the positioning frame , and the light guide plate is stacked on the reflector plate, and the backlight is arranged on one end side of the light guide plate, and the optical film is stacked on the light guide plate, and the optical film is formed with a flange to fit with the positioning structure of the light guide plate, and the light-shielding reflection The tape presses the area of the optical film adjacent to the frame edge of the light guide plate. The flattening effect of the light-shielding reflective tape can completely avoid possible deformation when the flange is placed in the groove, and maintain good flatness of the optical film.

Description of drawings

FIG. 1 is an exploded view showing components of a conventional light guide module.

FIG. 2 is a schematic diagram showing a design of a light guide plate according to an embodiment of the present invention.

FIG. 3 is a partially enlarged schematic view M of FIG. 2 .

FIG. 4 is a side view of the light guide plate shown in FIG. 2 .

FIG. 5 is an exploded view showing components constituting a light guide module of the present invention.

FIG. 6 shows a schematic diagram of several optical films stacked on the light guide plate.

Fig. 7 is an enlarged cross-sectional view taken along line A-A' of Fig. 6 .

FIG. 8 is a schematic diagram showing another embodiment of the present invention.

FIG. 9 is a schematic diagram showing another embodiment of the present invention.

Fig. 10 is a schematic diagram showing another embodiment of the present invention.

FIG. 11 is an exploded view showing a backlight module including the inventive light guide plate design.

12 is a top plan view of a backlight module.

Fig. 13 is an enlarged cross-sectional view obtained by cutting along the line B-B' of Fig. 12 .

Symbol Description

10 Light guide plate 12 Substrate

12a Light-emitting surface 12b Reflecting surface

12c side surface 14 positioning structure

14a Horizontal plane 16 Tenon

18 card slot 20 optical film

22 Diffuser film 24 X-axis prism enhancement film

26 Y-axis prism enhancement sheet 28, 28a, 28b flange

30 Backlight module 32 Positioning frame

32a Positioning frame bearing groove 34 Reflecting plate

36 Backlight 38 Blackout reflective tape

42 groove 44 display area

100 Light guide module 102 Positioning frame

102a Top surface of retaining wall 104 Light guide plate

104a top surface of light guide plate 106 optical film

108 Upper diffuser 110a, 110b Brightening film

112 Notch 114 Diaphragm flange

141, 142 bump 143 rib

143a Connection surface 143b Inclined surface

Detailed ways

The design of the invention is illustrated with different embodiments and diagrams as follows, wherein the same components appearing in various embodiments and diagrams are represented by the same reference numerals.

FIG. 2 is a schematic diagram showing a design of a light guide plate according to an embodiment of the present invention. As shown in FIG. 2, the light guide plate 10 is composed of a substrate 12 and several positioning structures 14 connected to the substrate 12. The substrate 12 has a light-emitting surface 12a, a reflective surface 12b and several surfaces surrounding the substrate. On the side surface 12c of the outer peripheral edge of 12, several positioning structures 14 are integrally extended on the side surface 12c, each positioning structure 14 is preferably higher than the level of the light-emitting surface 12a of the substrate, or the positioning structure 14 and the light-emitting surface 12a of the substrate They can also be located on the same plane without height difference. At least two symmetrical tenons 16 are formed on the side surface 12c, and each tenon 16 fits into a groove of a backlight module positioning frame (not shown).

FIG. 3 is a partially enlarged schematic view M of FIG. 2 to clearly show a design example of the positioning structure 14 of the present invention. As shown in Figure 3, the positioning structure 14 has two protrusions 141, 142 and a rib 143 connecting the two protrusions 141 and 142, the protrusions 141 and the protrusions 142 are connected to the side surface 12c of the substrate in an interval shape, and connect the two protrusions. A gap is formed between the ribs 143 of 141, 142 and the side surface 12c of the substrate, and a slot 18 is formed between the two protrusions 141, 142, the ribs, and the substrate 12, and the ribs 143 are provided with a groove 18 in the shape of the light-emitting surface 12a. A vertical connecting surface 143a and an inclined surface 143b, and the inclined surface 143b and the connecting surface 143a are arranged at an angle, so that the two protrusions 141, 142 and the top surfaces of the ribs 143 are connected to form a horizontal surface 14a having the same height ; Please also cooperate with the side view shown in Figure 4, the horizontal surface 14a of the positioning structure 14 is higher than the light-emitting surface 12a of the substrate by a vertical distance d, the shape and relative position of the bump 141, bump 142 and rib 143 are not limited , it only needs to be able to define a card slot 18.

FIG. 5 is a schematic diagram showing components constituting a light guide module of the present invention. As shown in FIG. 5 , several optical films 20 are stacked on the light-emitting surface 12a of the light guide plate 10. The optical films 20 include, for example, a diffusion film 22, an X-axis prism enhancement film 24, and a Y-axis prism enhancement film 26. A portion of the end surface of the optical film 20 protrudes to form a plurality of flanges 28 , which serve as corners for inserting into the slot 18 of the positioning structure 14 .

FIG. 6 shows a schematic diagram of several optical films 20 stacked on the light guide plate 10. FIG. 7 is an enlarged cross-sectional view obtained along the AA' line of FIG. Fitting design of structure 14. When each optical film 20 is placed on the light guide plate 10, the pre-formed flanges 28 of each optical film 20 are respectively inserted into the slots 18 of each positioning structure 14 to obtain a precise positioning effect, and the ribs 143 of the positioning structure 14 The formed slope 143b allows the flange 28 to slide smoothly into the slot 18 and abut against the bottom of the rib 143 to obtain a better film fixing effect, and the height of the rib slope 143b is not limited, only It only needs to be able to achieve the effect of abutting against the flange 28 smoothly.

Furthermore, as shown in FIG. 4 , the vertical distance d between the horizontal surface 14 a of the positioning structure and the light-emitting surface 12 a of the substrate 12 is preferably the same as the thickness of several optical films 20 stacked.

As shown in Figures 2 to 4, several positioning structures 14 with slots 18 are independently provided on the side surface 12c of the substrate 12 of the light guide plate 10, and the positioning structures 14 and the substrate 12 of the light guide plate 10 have a height difference In this way, when the flange 28 of the optical film 20 is placed into the slot 18, a stable fitting effect can be produced. Compared with the known design using the notch 112 of the positioning frame shown in FIG. 1, which can only provide abutting effect, this design Creating a firm fitting effect can completely avoid the slipping or loosening of the optical film 20, and can maintain the precise positioning of the optical film 20 on the light guide plate 10, and provide a modular combination of the optical film 20 and the light guide plate 10 design.

Furthermore, according to the design of this creation, the distribution method and quantity of the positioning structures on the substrate are not limited, and can be changed according to actual needs. For example, the positioning structures 14 can be distributed on three side surfaces as shown in FIG. 2, and each side surface is connected with several positioning structures 14; or as shown in FIG. Yes; moreover, as shown in FIG. 9 , several positioning structures 14 are not limited to be distributed on three side surfaces, and only distributed on two side surfaces can also provide a fitting effect.

On the other hand, as shown in FIG. 5 , the forming positions of the flanges 28 serving as locking angles on the optical film 20 only need to correspond to the positions of the locking grooves 18 , and their distribution and quantity are not limited. For example, the end faces of the diffusion sheet 22, the X-axis prism enhancement sheet 24, and the Y-axis prism enhancement sheet 26 do not need to simultaneously form a plurality of flanges 28 corresponding to all the positioning structures 14 on one side of the substrate 12, but can be as follows: As shown in the figure, flanges 28 are alternately formed on the same side of different optical films; or, as shown in FIG. After the outer optical film 20 is fitted with the positioning structure 14, other optical films 20 clamped therein (such as the diffuser 22 and the X-axis prism enhancement film 24) can obtain a fixed effect; moreover, as shown in FIG. 10 The formation method of the flanges 28a, 28b of the optical film is not limited, for example, the width of the insertion surface can be formed to be substantially the same as the width of the slot 18, so as to obtain the flange 28a with a fitting effect, and the width of the insertion surface can be formed simultaneously. The flange 28b is small and provides abutting positioning effect. Of course, the number of optical films 20 is not limited, and can be changed according to actual needs.

FIG. 11 is an exploded view showing a backlight module 30 including the inventive light guide plate design. As shown in FIG. 11, the backlight module 30 includes a positioning frame 32, a reflector 34, a light guide plate 10, at least one optical film 20, and a backlight 36. For example, in this embodiment, it is composed of a plurality of light emitting diodes. A light bar (light bar), and a shading sheet, the shading sheet can be a light-shielding reflective tape 38, the reflector 34 is placed in the bearing groove 32a of the positioning frame 32, the light guide plate 10 is stacked on the reflector 34, and the guide The tenon 16 of the light plate 10 fits into the groove 42 of the positioning frame 32. For example, the backlight 36 composed of light-emitting diodes is arranged on one end side of the light guide plate 10, and the optical film 20 is stacked on the light guide plate 10. The optical film 20 forms a There is a flange 28 to fit with the positioning structure 14 of the light guide plate 10, and the light-shielding reflective tape 38 is pressed against the area of the optical film 20 adjacent to the frame edge of the light guide plate 10 to cover the non-display area of a liquid crystal display panel (not shown). , As shown in the top plan view of the assembled backlight module 30 in FIG. As shown in the enlarged cross-sectional view of the line, when the flange 28 is placed into the groove 18, even if there is a slight deflection due to the angle of insertion, the deflection will also pass through the assembly process of the backlight module 30. The flattening effect of the light-shielding reflective tape 38 is completely eliminated, maintaining good flatness of the optical film.

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the invention should be included in the claims, rather than limited to the above-mentioned embodiments.

Claims (10)

1. A light guide plate, characterized in that: A substrate, the two major surfaces of the substrate are respectively formed as a light-emitting surface and a reflective surface, and a plurality of side surfaces are formed around the periphery of the substrate; and At least two positioning structures are connected to the side surface, each of the positioning structures has a height difference from the light-emitting surface of the substrate, and the connection between the two forms a slot that can be fitted with the flange of the optical film. 2. The light guide plate according to claim 1, wherein the positioning structure comprises: a first protruding block and a second protruding block, the two protruding blocks are respectively separated by a distance and connected to the side surface of the light guide plate; and A rib, the rib connects the first and the second protrusion, and there is a gap between the rib and the side surface of the light guide plate. 3 . The light guide plate according to claim 2 , wherein the rib portion has a connecting surface perpendicular to the light emitting surface, and an inclined surface disposed at an angle to the connecting surface. 4 . 4. The light guide plate according to claim 1, wherein the positioning structure is formed on at least two side surfaces of the substrate. 5 . The light guide plate according to claim 1 , wherein several positioning structures are formed on the same side surface of the substrate. 6. A backlight module, characterized in that, comprising: A positioning frame, the positioning frame is provided with a bearing slot; a reflector, accommodated in the bearing slot of the positioning frame; A light guide plate, accommodated on the surface of the reflection plate in the bearing groove, the light guide plate is provided with a base plate and several positioning structures formed on the side surface of the base plate, and each positioning structure has a height with the light emitting surface of the base plate Poor, and the connection between the two forms a card slot; a backlight source arranged on one side of the light guide plate; and At least one optical film is arranged on the side of the light guide plate different from the reflection plate, and the optical film is formed with at least one corner, and the corner is fitted into the opposite groove. 7. The backlight module according to claim 6, wherein the positioning structure comprises: a first and a second protruding block, the two protruding blocks are respectively connected to the side surface of the light guide plate with a gap; and A rib connects the first and the second bumps, and there is a gap between the rib and the side surface of the light guide plate. 8. The backlight module according to claim 6, wherein at least one optical film has several corners, and the optical film formed with the several corners includes an optical film disposed on the outermost layer . 9. The backlight module as claimed in claim 6, wherein the plurality of card angles are distributed on different sides of the optical film. 10 . The backlight module according to claim 6 , wherein the width of the angle insertion surface of the optical film is the same as the width of the groove of the positioning structure. 11 .

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