CN201083931Y - Backlight module - Google Patents

Abstract

The prism sheet of the backlight module of the utility model is provided with a plurality of prism structures, each prism structure is rotated at an angle, and when the prism sheet is applied to the backlight module, the prism sheet is provided on the light emitting surface of the light guide plate, and the bottom surface and the light emitting surface of the light guide plate are provided with optical structures arranged in the X and Y directions, so that the light is emitted through the light guide plate and the prism sheet without generating interference phenomenon (MOIRE).

Description

Backlight module

technical field

The utility model provides a prism sheet and a backlight module applied thereto, aiming at providing a prism sheet structure, which can prevent the interference phenomenon (MOIRE) of the prism sheet and the backlight applied thereto when it is applied to the backlight module. module.

Background technique

Flat-panel display technology is widely used in TV monitors, computer monitors, and handheld electronic products (such as: mobile phones, personal digital assistants (PDA), etc.). Liquid crystal display (LCD) is one of the types of flat-panel displays. A liquid crystal (LC) module having an array of pixels to display images. In a backlit LCD, the brightness enhancement film uses a prism structure to guide light along the line of sight axis (note: perpendicular to the display) to enhance the brightness of the display as seen by the user, thus enabling the system to use less energy to produce the required on-axis illumination. To date, brightness enhancement films have been supplied with parallel prismatic, lenticular, or pyramidal grooves on the light-emitting surface of the film to change the angle of the film-air interface so that light excites the film and The light can be obliquely incident on the surface of other films to redistribute, so that more light can be perpendicular to the light output surface of the adhesive film. The brightness enhancement film has a smooth light incident surface through which light enters from the backlight module. To date, many applications have used two brightness enhancement film layers rotated relative to each other such that the grooves in the respective film layers are at a 90 degree angle from each other. When using two brightness enhancement films for a flat panel display, an unwanted interference phenomenon (MOIRE) may occur, which is caused by two periodic prism pattern structures on the surfaces of the two brightness enhancement films.

As shown in Figure 1, the current traditional backlight module 1 includes a light source 10, a light guide plate 12, several optical films and a liquid crystal panel 14, wherein the light guide plate 12 is directly constructed with continuous sawtooth grooves on the upper and lower surfaces. Shaped optical structures 121, the optical structures 121 arranged on the upper and lower surfaces of the light guide plate 12 are respectively arranged in the X and Y directions, for example, the optical structures 121 arranged on the upper surface are arranged vertically, while the optical structures 121 on the lower surface 121 forms a horizontal arrangement, so that the incident straight light from the light source 10 is converted into vertical plane light by the light guide plate 12, and then passes through the optical structure 121 on the surface of the light guide plate 12 to collect the light in the X and Y directions and adjust the light divergence Angle, and has the effect of concentrating and adding light.

The several optical films arranged above the light guide plate 12 can be the diffusion sheet 13 and the first and second prism sheets 15 and 16, wherein the first and second prism sheets 15 and 16 are provided with complex prism structures 151 and 161. The complex prism structures 151 of the first prism sheet 15 are arranged vertically, and the complex prism structures 161 of the second prism sheet 16 are arranged horizontally; An interference phenomenon (MOIRE) occurs with the liquid crystal panel 14 , so that moiré images appear in the overall display effect.

Utility model content

The main purpose of the present invention is to provide a backlight module which can prevent MOIRE.

In view of this, the prism sheet of the present invention is provided with a plurality of prism structures, and each prism structure is rotated by an angle. The bottom surface and the light-emitting surface are provided with optical structures arranged in X and Y directions.

The beneficial effect of the utility model is that the light rays are emitted through the light guide plate and the prism sheet without interference phenomenon (MOIRE).

Description of drawings

FIG. 1 is a structural perspective view of a conventional backlight module;

Fig. 2 is the structural stereogram of prism sheet among the utility model;

Fig. 3 is the structural representation of prism sheet in the utility model;

Fig. 4 is the partial enlarged structural representation of prism sheet in the utility model;

5 is a perspective view of the structure of the first embodiment of the application of the prism sheet to the backlight module in the present invention;

FIG. 6 is a structural perspective view of a second embodiment of a prism sheet applied to a backlight module in the present invention.

【Description of figure number】

Backlight module 1 Light source 10

Light guide plate 12 Optical structure 121

Diffusion sheet 13 LCD panel 14

The first prism sheet 15 prism structure 151

Second prism sheet 16 Prism structure 161

Prism sheet 2 first side 21

Second side 22 Prism structure 23

Light guide plate 3 smooth surface 31

Bottom surface 32 Light emitting surface 33

Optical structure 34 Light source 4

Detailed ways

In order to make it easy for your examiner to understand the content of this utility model and the effect that can be achieved, specific embodiments are listed in conjunction with the drawings, and the detailed description is as follows:

The utility model backlight module, the basic structure of the prism sheet 2 is shown in Figure 2 and Figure 3, the prism sheet 2 has first and second sides 21, 22 corresponding to each other, and the prism sheet 2 is provided with There are a plurality of prism structures 23, and each prism structure 23 is rotated at an angle so that part of the prism structure 23 extends from the first side 21 to the second side 22. A prism structure 23, and part of the prism structure 23 extends from the first side 21 to the opposite first side 21, and the included angle between the prism structure 23 and the first and second sides 21, 23 is not equal to 90 degrees, In this embodiment, the rotation angle of the prism structure 23 is about 3-15 degrees. As shown in FIG. 4 , the included angle θ between the prism structure 23 and the second side 23 is about 3-15 degrees.

When the prism sheet 2 is applied to a backlight module, as shown in FIG. 5 , the backlight module at least includes: a light guide plate 3, a plurality of light sources 4 and at least one prism sheet 2, wherein the light guide plate 3 has a light incident surface 31 , a bottom surface 32 intersecting with the light incident surface 31, and a light exit surface 33 opposite to the bottom surface 32, the bottom surface 32 and the light exit surface 33 are constructed with a plurality of groove-like optical structures 34, the bottom surface 32 and the light exit surface 33 The optical structures are arranged in the X and Y directions respectively. In the embodiment shown in the figure, the optical structures 34 on the bottom surface 32 of the light guide plate are arranged in parallel, and the optical structures 34 on the light-emitting surface 33 of the light guide plate are arranged in a vertical direction. The light source 4 is arranged on one side corresponding to the light incident surface 31 of the light guide plate, and the light source 4 can be a point light source or a line light source (as shown in FIG. 6 ).

Wherein, the prism structure of the prism sheet is rotated by an angle according to the arrangement direction of the optical structure on the bottom surface of the light guide plate, and the prism structure of the prism sheet forms an included angle with the optical structure on the bottom surface of the light guide plate at an angle of about 3-15 degrees. As shown in the figure, the second side 22 of the prism sheet 2 is parallel to the incident surface 31 of the light guide plate, and the second side 22 is parallel to the optical structure 34 of the bottom surface 32 of the light guide plate, and the prism structure 23 is parallel to the second side The included angle of sides 22 is about 3-15 degrees.

Alternatively, the prism structure of the prism sheet is rotated by an angle with the arrangement direction of the optical structures on the light-emitting surface of the light guide plate, and the prism structure of the prism sheet forms an included angle of about 3-15 degrees with the optical structure of the light-emitting surface of the light guide plate. , as shown in FIG. 6, the second side 22 of the prism sheet 2 is perpendicular to the light incident surface 31 of the light guide plate, and the second side 22 is parallel to the optical structure 34 of the light exit surface 33 of the light guide plate, and the prism structure 23 The included angle with the second side 22 is about 3-15 degrees.

In the above-mentioned embodiments, the prism structure on the prism sheet is rotated at an angle so that the prism structure is not completely parallel to the optical structure on one side of the light guide plate, so that when the light from the light source is emitted through the light guide plate, prism sheet and liquid crystal panel, it can prevent The interference phenomenon (MOIRE) between the light guide plate and the liquid crystal panel occurs.

As mentioned above, the utility model provides another preferred and feasible backlight module, and an application for a new patent is submitted according to law; however, the above implementation description and drawings are preferred embodiments of the utility model, not based on This limitation of the utility model, therefore, all those similar and identical to the structure, device, and features of the utility model, all should belong to the creation purpose of the utility model and within the scope of the patent application.

Claims (10)

1. A backlight module, characterized in that it at least includes: A light guide plate, the light guide plate has a light incident surface, a bottom surface intersecting the light incident surface, and a light exit surface opposite to the bottom surface, the bottom surface and the light exit surface are constructed with a plurality of groove-shaped optical structures, the bottom surface and The optical structure of the light-emitting surface is arranged in the X and Y directions respectively; The light source is arranged on the side corresponding to the light incident surface of the light guide plate; At least one prism sheet is provided on the light emitting surface of the light guide plate, and a plurality of prism structures are arranged on the prism sheet, and each prism structure rotates by an angle. 2 . The backlight module according to claim 1 , wherein the optical structures on the bottom surface of the light guide plate are aligned parallel, and the optical structures on the light emitting surface of the light guide plate are aligned vertically. 3 . The backlight module according to claim 2 , wherein the prism structure of the prism sheet is rotated by an angle according to the arrangement direction of the optical structures on the bottom surface of the light guide plate. 4 . 4. The backlight module according to claim 2, wherein the prism structure of the prism sheet forms an included angle of 3-15 degrees with the optical structure of the bottom surface of the light guide plate. 5 . The backlight module according to claim 2 , wherein the prism structure of the prism sheet is rotated by an angle according to the arrangement direction of the optical structures on the light-emitting surface of the light guide plate. 6 . The backlight module according to claim 2 , wherein the prism structure of the prism sheet forms an included angle of 3-15 degrees with the optical structure of the light-emitting surface of the light guide plate. 7. The backlight module according to claim 1, wherein the prism sheet has two corresponding first and second sides, and the prism sheet is provided with a plurality of prism structures, wherein part of the prism structures are defined by the first side extending to the second side, while part of the prism structure extends from the first side to the opposite first side, and the included angle between the prism structure and the first and second sides is not equal to 90 degrees. 8. The backlight module according to claim 7, wherein the second side is parallel to the light incident surface of the light guide plate, and the second side is parallel to the optical structure of the bottom surface of the light guide plate. 9. The backlight module according to claim 7, wherein the second side is perpendicular to the light incident surface of the light guide plate, and the second side is parallel to the optical structure of the light exit surface of the light guide plate. 10. The backlight module according to claim 8 or 9, wherein the angle between the prism structure and the second side is 3-15 degrees.

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