Light guide element and backlight module

A technology of light guide element and backlight module, applied in the direction of optical element, optics, light guide, etc., can solve the problems of easy deformation of plastic frame, deformation of optical film, warping of optical film, etc., and achieve the effect of not easy deformation

Inactive Publication Date: 2015-11-25
WUHAN CHINA STAR OPTOELECTRONICS TECH CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

Usually, the optical film is in direct contact with the plastic frame to fix the optical film. The plastic frame is usually made of soft polyester material. During assembly or handling, when it is bumped or squeezed by exter...
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Abstract

The invention discloses a light guide element which comprises a light guide part, a first protection wall, a second protection wall and a third protection wall, wherein the first protection wall is opposite to the second protection wall; the third protection wall is located on one side far away from a light incoming surface of the light guide part; the first protection wall, the second protection wall, the third protection wall and the light guide part form accommodating space; and the accommodating space is used for accommodating an optical film. The light guide element can prevent the optical film from warping when the optical film receives an external force. The invention further discloses a backlight module.

Application Domain

Technology Topic

Image

  • Light guide element and backlight module
  • Light guide element and backlight module
  • Light guide element and backlight module

Examples

  • Experimental program(1)

Example Embodiment

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.
[0023] The term "upper surface" in the present invention refers to the surface facing the same as the light-emitting surface, and the lower surface is the surface opposite to the light-emitting surface.
[0024] See figure 1 with figure 2 One embodiment of the present invention provides a light guide element 100, including: a light guide portion 110, a first protection wall 121, a second protection wall 122, and a third protection wall 123, the light guide portion 110 has a first side surface 121 ′, the second side 122′, the third side 123′ and the fourth side 130′, the fourth side 130′ is the light incident surface 130 of the light guide 110, the first protection wall 121, the second protection wall 122 and the third The protective walls 123 are respectively arranged on the first side 121', the second side 122', and the third side 123'. The first protective wall 121 and the second protective wall 122 are arranged oppositely, and the third protective wall 123 is located away from the light guide portion On one side of the light incident surface, the first protective wall 121, the second protective wall 122, the third protective wall 123 and the light guide 110 form an accommodation space, and the accommodation space is used for accommodating the optical film. To define and protect the optical film. In one embodiment, the first protection wall 121, the second protection wall 122 and the third protection wall 123 may be arranged to extend along the light exit direction 111. In an embodiment, the first protection wall 121 and the second protection wall 122 may be parallel to each other, and the third protection wall 123 may be perpendicular to the first protection wall 121 and the second protection wall 122.
[0025] See image 3 , image 3 It is a schematic diagram of the structure of the backlight module in an embodiment of the present invention. In this embodiment, the above-mentioned light guide element 100 is assembled in a backlight module. Specifically, the backlight module includes a light guide element 100, an optical film 200, a plastic frame 300, a light source 400, a circuit board 500, a light-shielding glue 600, and a reflective sheet 700. The optical film 200 is placed on the upper surface of the light guide portion 110 and is accommodated in the accommodation space formed by the first protection wall 121, the second protection wall 122, the third protection wall 123 and the light guide portion 110, in order to allow the optical film 200 There is a certain space for expansion and contraction, and a certain gap is left between the optical film 200 and the first protective wall 121, the second protective wall 122, and the third protective wall 123. The reflective sheet 700 is disposed under the light guide element 100 and the plastic frame 300, and the reflective sheet 700 is fixed to the lower surface of the plastic frame 300 by double-sided tape. A light source 400 is arranged adjacent to the light incident surface 130 of the light guide element 100, and a circuit board 500 is arranged above the light source 400. The light source 400 and the circuit board 500 are fixed on the plastic frame 300 and the light guide element 100 with light shielding glue 600, that is, the circuit board 500 is pasted On the upper surface of the light-shielding glue 600, the light source 400 is pasted on the lower surface of the light-shielding glue 600, and at the same time, one end of the light-shielding glue 600 is glued to the upper surface of the plastic frame 300, and the other end is glued to the upper surface of the light guide element 100; the light source 400 may be an LED lamp Or cold cathode tube. In one embodiment, the optical film 200 can be fixed to the first protective wall 121, the second protective wall 122, and the third protective wall 123 with the adhesive sheet 140, that is, one end of the adhesive sheet 140 is stuck on the optical film 200 On the surface, the other end is pasted on the upper surfaces of the first protective wall 121, the second protective wall 122 and the third protective wall 123, and the sticking sheet 140 is usually double-sided tape. In this way, the light guide element 100 and the optical film 200 become a whole. The light guide element 100 and the optical film 200 as a whole are arranged in the plastic frame 300. The first protective wall 121, the second protective wall 122, and the third protective wall 123 of the light guide element 100 are in contact with the plastic frame 300. When the frame 300 is impacted or squeezed by an external force, the first protective wall 121, the second protective wall 122, and the third protective wall 123 protect the optical film to prevent the optical film 200 from contacting with the plastic frame 300 and causing warping ; The double-sided tape 140 affixed to the upper surface of the optical film 200 and the first protective wall 121, the second protective wall 122, and the third protective wall 123 strengthens the fixing effect of the optical film 200, and further prevents the optical film 200 from warping song.
[0026] See Figure 4 , Figure 4 It is a schematic cross-sectional view of a backlight module in an embodiment of the present invention. Wherein, the third protection wall 123 of the light guide element 100 is provided with a groove 124, the groove 124 is provided on the inner wall of the third protection wall 123, and the bottom surface of the groove 124 is flush with the light exit surface of the light guide portion 110. image 3 The cross-section of the groove 124 shown in FIG. is rectangular, and in other embodiments, it may be arc-shaped or other shapes. When the optical film 200 is assembled on the light guide 110, one end of the optical film 200 is inserted into the groove 124, and the height of the groove 124 is approximately equal to the thickness of the optical film 200, so that the groove 124 faces the optical film 200. Better fixation, wherein the height of the groove 124 refers to the size of the groove along the light emitting direction. In this embodiment, the light guide element 100 and the optical film 200 are assembled into a backlight module as a whole. Specifically, the backlight module includes: the light guide element 100, the optical film 200, the plastic frame 300, and the light source. 400, circuit board 500, shading glue 600 and reflective sheet 700. The reflective sheet 700 is disposed under the light guide element 100 and the plastic frame 300, and the reflective sheet 700 is fixed to the lower surface of the plastic frame 300 by double-sided tape. A light source 400 is arranged adjacent to the light incident surface of the light guide element 100. Above the light source 400 is the circuit board 500. The light source 400 and the circuit board 500 are fixed on the plastic frame 300 and the light guide element 100 with light shielding glue 600, that is, the circuit board 500 is pasted on the light shield The upper surface of the glue 600, the light source 400 is glued to the lower surface of the light-shielding glue 600, and one end of the light-shielding glue 600 is glued to the upper surface of the glue frame 300, and the other end is glued to the upper surface of the light guide element 100; the light source 400 can be an LED lamp or a cold Cathode tube. In this way, the light guide element 100 and the optical film 200 are assembled as a whole in the plastic frame 300, the light incident surface 130 is adjacent to the light source 400, the first protective wall 121, the second protective wall 122, the third protective wall 123 and the plastic When the frame 300 is in contact with each other, when the plastic frame 300 is impacted or squeezed by an external force, the first protective wall 121, the second protective wall 122, and the third protective wall 123 protect the optical film 200 and prevent it from warping; One end of the diaphragm 200 is inserted into the groove 124 to limit the optical diaphragm 200 to further prevent warpage. In this embodiment, only the third protective wall 123 of the light guide element 100 is provided with grooves. In other embodiments, only the first protective wall 121 and the second protective wall 122 of the light guide element 100 may be provided. Groove 124; In another embodiment, a groove 124 can also be provided on the first protective wall 121, the second protective wall 122, and the third protective wall 123 at the same time.
[0027] See Figure 5 , Figure 5 It is a schematic cross-sectional view of the backlight module in an embodiment of the present invention. Wherein, the third protective wall 123 of the light guide element 100 is provided with a shielding sheet 125. The shielding sheet 125 is provided on the upper surface of the third protective wall 123 and extends to the side of the light guide 110. The third protective wall 123 is set at the height To be equivalent to the thickness of the optical film 200, the shielding sheet 125 may be one or multiple separated from each other; the optical film 200 is arranged above the light guide portion 110, one end of which is arranged below the shielding sheet 125, and the shielding sheets 125 are paired It plays a protective and fixed role. In this embodiment, the light guide element 100 and the optical film 200 are assembled into a backlight module as a whole. Specifically, the backlight module includes: the light guide element 100, the optical film 200, the plastic frame 300, and the light source. 400, circuit board 500, shading glue 600 and reflective sheet 700. The reflective sheet 700 is disposed under the light guide element 100 and the plastic frame 300, and the reflective sheet 700 is fixed to the lower surface of the plastic frame 300 by double-sided tape. A light source 400 is arranged adjacent to the light incident surface of the light guide element 100. Above the light source 400 is the circuit board 500. The light source 400 and the circuit board 500 are fixed on the plastic frame 300 and the light guide element 100 with light shielding glue 600, that is, the circuit board 500 is pasted on the light shield The upper surface of the glue 600, the light source 400 is glued to the lower surface of the light-shielding glue 600, and one end of the light-shielding glue 600 is glued to the upper surface of the glue frame 300, and the other end is glued to the upper surface of the light guide element 100; the light source 400 can be LED lamp or cold Cathode tube. In this way, the light guide element 100 and the optical film 200 are assembled as a whole in the plastic frame 300, the light incident surface 130 is adjacent to the light source 400, the first protective wall 121, the second protective wall 122, the third protective wall 123 and the plastic When the frame 300 is in contact with each other, when the plastic frame 300 is impacted or squeezed by external force, the first protective wall 121, the second protective wall 122, and the third protective wall 123 protect the optical film 200 from warping; The sheet 125 further restricts the optical film 200 to further prevent the occurrence of warpage. In this embodiment, the shielding piece 125 is provided only on the upper surface of the third protective wall 123. However, in other embodiments, only the upper surfaces of the first protective wall 121 and the second protective wall 122 may be provided with shielding. Sheet 125; In another embodiment, a shield sheet 125 may also be provided on the upper surfaces of the first protective wall 121, the second protective wall 122, and the third protective wall 123 at the same time.
[0028] In one embodiment, the shielding sheet 125 and the first protective wall 121, the second protective wall 122, and the third protective wall 123 may be provided as an integral structure that cannot be separated. In one embodiment, the shielding sheet 125 can be set as an independent component. In this case, a plurality of blocking blocks can be provided on the shielding sheet 125, and the first protective wall 121, the second protective wall 122, and the third protective wall The upper surface of the 123 is provided with a plurality of card slots corresponding to the card blocks. During assembly, the two are buckled together to fix the shielding sheet 125, thereby protecting and limiting the optical film 200.
[0029] In an embodiment of the present invention, the light guide portion 110 and the first protective wall 121, the second protective wall 122, and the third protective wall 123 are integral structures that cannot be separated.
[0030] The embodiments described above do not constitute a limitation on the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principle of the above-mentioned embodiments shall be included in the protection scope of the present invention.
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Description & Claims & Application Information

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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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