TWI382240B - A method for eliminating projective shadow of light guide member and a device thereof - Google Patents

Description

Method and device for eliminating shadow cast by light guiding element

The present invention relates to a method and apparatus for eliminating shadow cast by a light guiding element.

In the conventional backlight module, the light guiding element (light guiding plate) has many different structural forms, and is relatively simple. As shown in FIG. 1 , the light guiding element 7 is a piece of a body, and at least one side of the periphery thereof. A light-incident surface 71 is disposed on the side, and a light-emitting surface 72 intersecting the light-incident surface 71 is further disposed, and a groove or other diffusion guide may be disposed on the opposite side (bottom surface) of the light-emitting surface or the light-emitting surface as needed. In the actual application, when the light of the light source body 20 enters the light guiding element 7 from the light incident surface 71, the light can be lighted in the light guiding element 7 by the excellent light guiding property of the material itself. The diffusion is adequately directed and most of the light is directed out of the illuminating surface 72 to form a uniform backlight.

In addition, the structure shown in FIG. 2 is provided on the sheet-shaped light guiding element 8 except for the light-incident surface 81 and the light-emitting surface 82, and the light-emitting surface 82 is provided with a plurality of buttons corresponding to the respective buttons. a through hole 83 (the through hole 83 is provided for the conductive rubber disposed under the light guiding member 8 to pass through the elastic supporting portions of the protrusions on the surface thereof so that the top surface of each elastic supporting portion interferes with each button), After the light from the light source body 20 enters the light guiding element 8 from the light incident surface 81, the light is scattered by the through holes 83 during the guided diffusion process of the light guiding element 8, thereby affecting the transmission of the light. Therefore, a darker shadow portion 831 is formed on the periphery of each of the through holes 83 corresponding to the opposite edge portion of the light source body 20. This uneven brightness and darkness seriously affects the quality of the overall backlight and forms a lack of application.

In view of the above-mentioned shortcomings of the light guiding element (light guide plate) having a through hole, the inventors have studied the improvement of these shortcomings, and finally the present invention has been produced.

The main object of the present invention is to provide a method for eliminating the shadow cast by the light guiding element, which can effectively eliminate the shadow appearing behind the hole position after the light is incident on the hole position, thereby improving the quality of the backlight illumination.

Another object of the present invention is to provide an apparatus for eliminating shadow cast by a light guiding element, which can effectively simplify the structural design of the light guiding element, reduce the development and production cost of the element.

In order to achieve the above object and effect, the technical means adopted by the present invention include: a light guiding element having a light incident surface and a light emitting surface intersecting the light incident surface; at least one light source body disposed on the light guiding light The component protrudes to a side portion between the light surface and the light exiting surface, so that at least partial light generated by the light source body can be projected on the front side of the light emitting surface.

As for the detailed construction, application principle, function and effect of the present invention, a complete understanding can be obtained by referring to the following description according to the drawings:

Referring to FIG. 3, it can be clearly seen that the present invention mainly includes two parts: a light guiding element 1 and a light source body 2, wherein the light guiding element 1 is a sheet-shaped light guiding body. The light-emitting surface 11 is disposed on the side edge, and an intersecting light-emitting surface 12 is disposed on the side of the light-incident surface 11 , and a plurality of holes 13 extending through the light-guiding element 1 are disposed on the light-emitting surface 12 (the hole 13 The plurality of light source bodies 2 are disposed on the side of the light incident surface 11 of the light guiding element 1 and are offset to the other side of the extending plane 12A of the light emitting surface 12, because of the structure necessary for combination with other related elements. The light generated by each of the light source bodies 2 can have the first light and the second light projected on the front side of the light incident surfaces 11 and 12 at the same time, and is projected onto the light source body 2 of the light incident surface 11 and the light exit surface 12, Can be the same or not the same.

In the above structure, a part of the light from the light source body 2 can be introduced into the light guiding element 1 by the light incident surface 11, and a conventional guiding and expanding effect is performed in the light guiding element 1. At this time, each of the holes 13 corresponds to the light incident back surface. The peripheral edge 13A (corresponding to the opposite side of the light source body 2), due to the influence of the hole position 13 on the refractive refracting of the incident light, will inevitably generate shadows, but some of the light of the light source body 2 can be unimpeded The light is directly incident on the light-emitting surface 12 without passing through the inside of the light-guiding element 1. Thus, the light can be refracted into the light-guiding element 1 at the light-emitting surface 11 of the rear periphery 13A where the hole 13 is originally shadowed. Thereby, the shadow originally generated on the rear periphery 13A of the hole position 13 can be effectively eliminated, thereby improving the overall back (guide) light quality.

Referring to Figures 4 to 6, it can be seen that the above structure of the present invention can be combined with at least one circuit board 3, a conductive rubber 4 and a plurality of buttons 5 in an outer casing composed of a housing 6 and a cover 60. In order to form a basic structure that can be implemented, the circuit board 3 is electrically connected to each of the light source bodies 2, and a plurality of electrical conduction contacts 31 are disposed on the circuit board 3 corresponding to the light guiding elements 1 respectively. The hole 13 is provided, and the elastic support portion 41 of the conductive rubber 4 is also provided with a plurality of protrusions corresponding to the hole positions 13 of the light guiding element 1, so that the elastic supporting portions 41 can pass through the respective holes 13 and the plurality of buttons. 5 The bottom portion is in contact with each other, and the upper portion of each of the buttons 5 can be exposed outwardly through the cover 60, and a conductive portion is disposed on the bottom surface of each of the elastic supporting portions 41, and the elastic mechanism of each elastic supporting portion 41 can be used for the button 5. When the external force is operated, a deformation amount is generated to make the conductive portion contact with the electrical conduction contact 31 of the circuit board 3 to form electrical conduction, and when the external force of the operation button 3 disappears, the elastic deformation of the elastic support portion 11 is driven. The conductive portion returns to the original position.

It should be particularly emphasized that the diameter of the elastic support portion 41 is usually the largest at the hole position 13, and the smaller the diameter of the button 3 (ie, the top end), the light source illumination method of the present invention is It can be minimized by the elastic support portion 41 at the light-emitting surface 12 of the light-guiding element 1. This can also reduce the shadow of the upper surface to a certain extent, and also has the effect of improving the backlight quality.

The invention utilizes the above structure, not only can effectively eliminate the shadow portion located at the periphery of the hole position 13 to improve the overall back (guide) light quality; meanwhile, since it does not need to change the light guiding element 1 and the circuit board 3 during implementation, The main structure of components such as conductive rubber 4 does not significantly increase development and production costs, and is more in line with the economic benefits of production than other technical means that can achieve similar functions.

It can be seen from the above that the method for eliminating the shadow cast by the light guiding element and the device thereof have the effect of eliminating the shadow of light projection on the peripheral side of the hole, and it has industrial applicability, novelty and advancement.

The above description is only a preferred embodiment of the invention and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the patent application scope of this creation are covered by the scope of the invention.

1, 7, 8‧‧‧ Light-guiding components
31‧‧‧Electrical Conduction Contacts

11, 71, 81‧‧‧ into the glossy surface
4‧‧‧Electrical rubber

12, 72, 82‧‧ ‧ light surface
41‧‧‧Elastic support

12A‧‧‧Extension plane
5‧‧‧ buttons

13‧‧‧ hole position
6‧‧‧Shell

13A‧‧‧ Periphery
60‧‧‧Shell cover

2, 20‧‧‧ light source body
83‧‧‧Tongkong

3‧‧‧Circuit board
831‧‧‧ shadow parts

Figure 1 is a side plan view of a light guiding element.

Fig. 2 is a plan view showing a plan view of another light guiding element.

Figure 3 is a schematic view showing the construction of the main elements of the present invention.

Figure 4 is an exploded perspective view of the related components of the present invention and a possible embodiment.

Figure 5 is a cross-sectional view of the overall combination of Figure 4.

Figure 6 is a schematic diagram of the application of the embodiment of Figure 4.

1‧‧‧Light guiding elements

11‧‧‧Into the glossy surface

12‧‧‧Glossy

12A‧‧‧Extension plane

13‧‧‧ hole position

13A‧‧‧ Periphery

2‧‧‧Light source body

Claims (9)

An apparatus for eliminating a shadow cast by a light guiding component, comprising: a light guiding component having a light incident surface and a light emitting surface intersecting the light incident surface; and at least one light source body disposed on the light guiding component The side portion between the surface and the light-emitting surface is located at an extending plane that is opposite to the light-emitting surface, so that at least partial light generated by the light source body can be projected on the front side of the light-emitting surface. The device for eliminating the shadow cast by the light guiding element according to the first aspect of the invention, wherein the light guiding element is provided with a plurality of through holes on the light emitting surface. The apparatus for eliminating shadows projected by a light guiding element according to claim 1 or 2, wherein the light rays projected on the light incident surface and the light exiting surface are from the same light source. The device for eliminating shadow projection by a light guiding member according to claim 1 or 2, wherein the light incident on the light incident surface and the light exiting surface is from a respective light source. The device for eliminating the shadow cast by the light guiding element according to the first or second aspect of the invention, wherein the light guiding element is stacked on a circuit board, and the light source system is disposed on the light incident surface of the light guiding element. The side is biased toward the side of the light exiting surface and electrically connected to the circuit board. A method for eliminating a shadow cast by a light guiding component, wherein a first light is projected from a light incident surface of a light guiding component toward the light guiding component; and a second light is emitted from the vicinity of the light guiding component toward the light guiding component. The light exit surface is projected to eliminate the projected shadow generated by the first light in the light guiding element. The method for eliminating shadow cast by a light guiding element according to claim 6, wherein the first and second rays are from the same light source. The method for eliminating shadow cast by a light guiding element according to claim 6, wherein the first and second light rays are from different light sources. The method for eliminating a shadow cast by a light guiding member according to claim 7 or 8, wherein the second light source is from a light source that is offset from an extending plane of the light emitting surface of the light guiding member.