CN103018817A - Light guide plate structure and method for manufacturing light guide plate - Google Patents

Abstract

The invention provides a light guide plate structure and a manufacturing method of the light guide plate, wherein the light guide plate structure includes a light guide plate, a first medium layer, an optical microstructure, a second medium layer, and a reflection layer. The light guide plate has a light-emitting surface and a bottom surface, and the light-emitting surface and the bottom surface are opposite to each other. The first medium layer is formed on the light-emitting surface. The optical microstructure is formed on the bottom surface, and is used to make the light in the light guide plate emit from the light-emitting surface. The second medium layer is formed on the optical microstructure, and the refractive index of the first medium layer and the second medium layer is smaller than that of the light guide plate and larger than that of air. The reflective layer is formed on the second medium layer, and is used to reflect the light in the light guide plate and exit from the light emitting surface.

Description

Light guide plate structure and light guide plate manufacturing method

technical field

The present invention relates to a light guide plate structure and a method of manufacturing the light guide plate, in particular to a light guide plate in which the refractive index of the medium layer formed on the light-emitting surface and the bottom surface of the light guide plate is between the refractive index of the light guide plate and the air refractive index. Light plate structure and light guide plate manufacturing method.

Background technique

Please refer to FIG. 1 , which is a partial cross-sectional view of a keyboard 1 in the prior art. As shown in FIG. 1 , the keyboard 1 includes a bottom plate 10 , a plurality of keys 12 and a backlight module 14 . Each button 12 is disposed on the bottom plate 10 for the user to press to execute the function that the user wants to input. The backlight module 14 is disposed under the bottom plate 10 to provide a light source for the keyboard 1 to emit light. The backlight module 14 includes a light shielding plate 140 , a light guide plate 142 , a metal plate 144 , a reflector 146 and a light emitting unit 148 . The light shielding plate 140 is disposed under the bottom plate 10 , the light guide plate 142 is disposed under the light shielding plate 140 , the metal plate 144 is disposed under the light guide plate 142 , and the reflector 146 is disposed on the metal plate 144 and under the light guide plate 142 . The light-emitting unit 148 is arranged on one side of the light guide plate 142, so that the light emitted by the light-emitting unit 148 can be completely reflected in the light guide plate 142 and reflected by the reflective sheet 146 to be uniformly emitted from the light guide plate 142, and then The direction toward the base plate 10 is projected out of the keys 12 through the light-shielding plate 140 , so as to produce the effect of the keyboard 1 emitting light.

In the above-mentioned design, the total reflection phenomenon of light utilizes the design that the refractive index of the light guide plate 142 is greater than that of the air in the gap between the light shielding plate 140 and the light guide plate 142 (which can be regarded as 1). However, due to the light guide plate The surface of the light guide plate 142 is not properly protected. Therefore, in the process of assembling the light guide plate 142 into the keyboard 1, the surface of the light guide plate 142 is often adhered to or scratched by foreign objects (such as grease, dust, etc.). In this way, the total reflection of light in the light guide plate 142 will be destroyed, resulting in light leakage or short light transmission distance, which will affect the light use efficiency and luminous uniformity of the light guide plate 142 . In addition, it can be seen from FIG. 1 that the backlight module 14 adopts a design in which the light guide plate 142 is arranged between the light shielding plate 140 and the reflective sheet 146 to play the effect of guiding the light to uniformly emit from the positions corresponding to the keys 12, but the light guide plate 142, the light shielding The configuration of the plate 140 and the reflective sheet 146 will occupy too much space inside the keyboard, which is not conducive to the thinner design of the keyboard 1 .

Contents of the invention

The object of the present invention is to provide a light guide plate structure and a light guide plate manufacturing method thereof in which the refractive index of the medium layer respectively formed on the light-emitting surface and the bottom surface of the light guide plate is between the refractive index of the light guide plate and the air refractive index. Solve the above problems.

To achieve the above object, the first technical solution of the present invention provides a light guide plate structure, comprising: a light guide plate, which has a light-emitting surface and a bottom surface, the light-emitting surface and the bottom surface are opposite to each other; a first dielectric layer, which is formed on the The light-emitting surface; the optical microstructure, which is formed on the bottom surface, is used to make the light in the light guide plate emit from the light-emitting surface; the second medium layer, which is formed on the optical microstructure, and the first medium layer and The refractive index of the second medium layer is smaller than the refractive index of the light guide plate and greater than the refractive index of air; and a reflective layer, which is formed on the second medium layer, is used to reflect the light in the light guide plate to exit from the light exit surface .

Preferably, the light guide plate is made of polycarbonate, and the first dielectric layer and the second dielectric layer are made of silicon dioxide.

Preferably, the first dielectric layer and the second dielectric layer are respectively formed on the light-emitting surface and the optical microstructure by surface coating or co-extrusion.

Preferably, the reflective layer is formed on the second dielectric layer by spraying paint, printing, bronzing, sputtering or physical vapor deposition.

Preferably, the optical microstructure is formed on the bottom surface by heat pressing, ink printing, or ultraviolet curing.

The second technical solution of the present invention provides a method for manufacturing a light guide plate, comprising the following steps: providing a light guide plate with a light-emitting surface and a bottom surface; forming an optical microstructure on the bottom surface; The first medium layer and the second medium layer are respectively formed on the light-emitting surface and the optical microstructure, wherein the refractive index of the first medium layer and the second medium layer is smaller than the refractive index of the light guide plate and larger than that of air refractive index; and forming a reflective layer on the second medium layer.

Preferably, the light guide plate is made of polycarbonate, and the first dielectric layer and the second dielectric layer are made of silicon dioxide.

Preferably, the first dielectric layer and the second dielectric layer are respectively formed on the light-emitting surface and the optical microstructure by surface coating or co-extrusion.

Preferably, the reflective layer is formed on the second dielectric layer by spraying paint, printing, bronzing, sputtering or physical vapor deposition.

Preferably, the optical microstructure is formed on the bottom surface by heat pressing, ink printing, or ultraviolet curing.

Compared with the prior art, the present invention utilizes a design in which the refractive index of the medium layer formed on the light-emitting surface and the bottom surface of the light guide plate is between the refractive index of the light guide plate and the air refractive index, so that the light can be reliably A total reflection phenomenon is generated in the light guide plate, thereby increasing the light transmission distance of the light in the light guide plate and improving the light energy transmission effect. In addition, the optical microstructure and the reflective layer are directly formed on the light guide plate to replace the configuration of the light shielding plate and the reflective sheet above and below the light guide plate mentioned in the prior art. The light guide plate provided by the present invention The overall thickness of the structure can be effectively reduced to facilitate the subsequent slimming design of the keyboard. In addition, through the interlayer protection design formed by the first dielectric layer, the second dielectric layer and the reflective layer, and the isolation design that the second dielectric layer is formed on the light guide plate and the reflective layer, the present invention can also effectively prevent the light guide plate from In the process of assembling the structure into the keyboard, the surface of the light guide plate is adhered or scratched by foreign objects (such as grease, dust, etc.), and the light in the light guide plate is prevented from being directly absorbed by the reflective layer, thereby further improving the light guide plate. Light usage efficiency and luminous uniformity of the light panel structure.

Description of drawings

FIG. 1 is a partial cross-sectional schematic diagram of a keyboard in the prior art.

FIG. 2 is a partial cross-sectional schematic diagram of a light guide plate structure provided in a keyboard according to an embodiment of the present invention.

FIG. 3 is a partially enlarged schematic view of the structure of the light guide plate in FIG. 2 .

FIG. 4 is a flow chart of forming the structure of the light guide plate shown in FIG. 3 by using the manufacturing method of the light guide plate of the present invention.

Detailed ways

In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

Please refer to FIG. 2, which is a partial cross-sectional view of a light guide plate structure 100 provided in a keyboard 102 according to an embodiment of the present invention. As shown in FIG. 2, the light guide plate structure 100 is applied to the lighting design of the keyboard 102, but Not limited to this application. In this embodiment, the light guide plate structure 100 is arranged on the position corresponding to the plurality of keys 104 in the keyboard 102, and the light emitting unit 106 (such as a light emitting diode (Light Emitting Diode, LED) etc.) in the keyboard 102 is arranged On one side of the light guide plate structure 100 , the light emitted by the light emitting unit 106 can be projected toward the keys 104 through the light guide plate structure 100 , so that the effect of the keyboard 102 having a light emitting function is exerted.

Here is a detailed description of the structural design of the light guide plate structure 100. Please refer to FIG. 3 and FIG. 4. FIG. 3 is a partially enlarged schematic view of the light guide plate structure 100 in FIG. A flow chart of forming the light guide plate structure 100 in FIG. 3 . As shown in FIG. 3 , the light guide plate structure 100 includes a light guide plate 108, a first medium layer 110, an optical microstructure 112, a second medium layer 114, and a reflective layer 116, wherein the optical microstructure 112 in FIG. In short, but not limited thereto, other common optical microstructure designs, such as ink pattern layers, can also be used. The light guide plate 108 has a light emitting surface 118 and a bottom surface 120 , and the light emitting surface 118 and the bottom surface 120 are opposite to each other. As shown in Figure 4, the light guide plate manufacturing method of the present invention comprises the following steps:

Step 400: providing a light guide plate 108;

Step 402: forming an optical microstructure 112 on the bottom surface 120;

Step 404: Forming the first dielectric layer 110 and the second dielectric layer 114 on the light-emitting surface 118 and the optical microstructure 112 by surface coating or co-extrusion (Co-extrusion);

Step 406 : Form a reflective layer 116 on the second dielectric layer 114 .

It can be seen from the above steps that the first medium layer 110 is formed on the light-emitting surface 118, the optical microstructure 112 is formed on the bottom surface 120 to scatter or diffuse the light in the light guide plate 108 to exit from the light-emitting surface 118, and the second medium The layer 114 is formed on the optical microstructure 112, and the reflective layer 116 is formed on the second medium layer 114, which is used to reflect the light in the light guide plate 108 and exit from the light exit surface 118. In this embodiment, the first medium layer 110 and the second medium layer The second dielectric layer 114 is preferably formed on the light-emitting surface 118 and the optical microstructure 112 by surface coating or co-extrusion, and the reflective layer 116 is preferably formed by spraying paint, printing, bronzing, sputtering or physical vapor phase Evaporation (Physical Vapor Deposition, PVD) is formed on the second dielectric layer 114, while the optical microstructure 112 is preferably formed on the bottom surface 120 by thermal pressing, ink printing, or ultraviolet curing, but not Limited by this, in other words, as long as it is a molding process that can be used to form the first dielectric layer 110, the optical microstructure 112, the second dielectric layer 114, and the reflective layer 116 on the light guide plate 108, it can be implemented by the present invention. Adopt it. As for the relevant descriptions of the forming process of the first dielectric layer 110 , the optical microstructure 112 , the second dielectric layer 114 and the reflective layer 116 , they are common in the prior art, and thus will not be repeated here.

More specifically, the present invention adopts a design in which the refractive index of the first dielectric layer 110 and the second dielectric layer 114 is smaller than the refractive index of the light guide plate 108 and greater than the refractive index of air, so as to ensure that light can pass through the light guide plate 108. The purpose of total reflection. For example, in this embodiment, the light guide plate 108 can be made of polycarbonate (Polycarbonate, PC) material whose refractive index is approximately equal to 1.5, and the first dielectric layer 110 and the second dielectric layer 114 can be made of silicon dioxide Composed of materials whose refractive index is approximately equal to 1.2. It should be noted that the material selection of the light guide plate 108 , the first dielectric layer 110 , and the second dielectric layer 114 is not limited to the above-mentioned embodiments, and may vary according to the actual application requirements of the light guide plate structure 100 .

Through the above configuration, after the light is incident into the light guide plate 108, the light can travel in the light guide plate 108, and when it is incident on the bottom surface 120 of the light guide plate 108, the optical reflection design of the reflective layer 116 and the optical microstructure The optical scattering or diffusion design of 112 projects from the positions corresponding to the keys 104 of the keyboard 102 out of the keyboard 102 through the light-emitting surface 118 , so that the keyboard 102 emits light. In the above process, since the first dielectric layer 110 and the second dielectric layer 114 whose refractive index is greater than the refractive index of air and smaller than the refractive index of the light guide plate 108 are respectively formed on the light-emitting surface 118 and the bottom surface 120 of the light guide plate 108, therefore, The light emitted by the light-emitting unit 106 can definitely generate total reflection in the light guide plate 108 , so as to increase the light transmission distance of the light in the light guide plate 108 and improve the light energy transmission effect.

In addition, in terms of the design of guiding light from the positions corresponding to the keys of the keyboard to project out of the keyboard through the light-emitting surface of the light guide plate, the present invention utilizes the configuration that the optical microstructure 112 and the reflective layer 116 are directly formed on the light guide plate 108 to achieve Instead of the prior art, the arrangement of setting light-shielding plates and reflective sheets above and below the light-guiding plate is used to produce the same light-guiding effect. In this way, by omitting the design of the light-shielding plate and the reflective sheet, the overall thickness of the light guide plate structure 100 can be effectively reduced to facilitate the subsequent slimming design of the keyboard.

In addition, through the interlayer protection design formed by the first dielectric layer 110, the second dielectric layer 114 and the reflective layer 116 and the isolation design of the second dielectric layer 114 formed on the light guide plate 108 and the reflective layer 116, the present invention can also be effective. It can effectively prevent the surface of the light guide plate 108 from being attached or scratched by foreign matter (such as grease, dust, dirt, etc.) during the process of assembling the light guide plate structure 100 into the keyboard 102, and prevent the light in the light guide plate 108 from being directly It is absorbed by the reflective layer 116 , so as to further improve the light utilization efficiency and luminous uniformity of the light guide plate structure 100 .

The present invention utilizes the design that the refractive index of the medium layer respectively formed on the light-emitting surface and the bottom surface of the light guide plate is between the refractive index of the light guide plate and the refractive index of air, so that the light can be completely reflected in the light guide plate. phenomenon, thereby increasing the light transmission distance of the light in the light guide plate and improving the light energy transmission effect. In addition, the optical microstructure and the reflective layer are directly formed on the light guide plate to replace the configuration of the light shielding plate and the reflective sheet above and below the light guide plate mentioned in the prior art. The light guide plate provided by the present invention The overall thickness of the structure can be effectively reduced to facilitate the subsequent slimming design of the keyboard. In addition, the present invention can also effectively prevent the light guide plate from In the process of assembling the structure into the keyboard, the surface of the light guide plate is adhered or scratched by foreign objects (such as grease, dust, etc.), and the light in the light guide plate is prevented from being directly absorbed by the reflective layer, thereby further improving the light guide plate. Light usage efficiency and luminous uniformity of the light panel structure.

The present invention has been described by the above-mentioned related embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention all belong to the scope of patent protection of the present invention.

Claims (10)

1. a light conducting plate structure is characterized in that, comprises:

Light guide plate, it has exiting surface and bottom surface, and this exiting surface and this bottom surface are toward each other;

The first medium layer, it is formed on this exiting surface;

Optical microstructures, it is formed on this bottom surface, is used for making the light in this light guide plate to penetrate from this exiting surface;

The second medium layer, it is formed on this optical microstructures, and the refractive index of this first medium layer and this second medium layer is less than the refractive index of this light guide plate and greater than the refractive index of air; And

The reflection horizon, it is formed on this second medium layer, and the light that is used for reflecting in this light guide plate penetrates from this exiting surface.

2. light conducting plate structure as claimed in claim 1 is characterized in that, this light guide plate is comprised of the polycarbonate material, and this first medium layer and this second medium layer are comprised of the silicon dioxide material.

3. light conducting plate structure as claimed in claim 1 is characterized in that, this first medium layer and this second medium layer are that the mode with surface-coated or co-extrusion modling is formed at respectively on this exiting surface and this optical microstructures.

4. light conducting plate structure as claimed in claim 1 is characterized in that, this reflection horizon with spray paint, the mode of printing, gold stamping, sputter or physical vapor evaporation is formed on this second medium layer.

5. light conducting plate structure as claimed in claim 1 is characterized in that, this optical microstructures is with hot pressing, ink printing, or the mode of ultraviolet curing is formed on this bottom surface.

6. a method for manufacturing light guide plate is characterized in that, comprises following steps:

Light guide plate is provided, and it has exiting surface and bottom surface;

Form optical microstructures on this bottom surface;

Mode with surface-coated or co-extrusion modling is formed at first medium layer and second medium layer on this exiting surface and this optical microstructures respectively, and wherein the refractive index of this first medium layer and this second medium layer is less than the refractive index of this light guide plate and greater than the refractive index of air; And

Form the reflection horizon on this second medium layer.

7. method for manufacturing light guide plate as claimed in claim 6 is characterized in that, this light guide plate is comprised of the polycarbonate material, and this first medium layer and this second medium layer are comprised of the silicon dioxide material.

8. method for manufacturing light guide plate as claimed in claim 6 is characterized in that, this first medium layer and this second medium layer are that the mode with surface-coated or co-extrusion modling is formed at respectively on this exiting surface and this optical microstructures.

9. method for manufacturing light guide plate as claimed in claim 6 is characterized in that, this reflection horizon be spray paint, the mode of printing, gold stamping, sputter or physical vapor evaporation is formed on this second medium layer.

10. method for manufacturing light guide plate as claimed in claim 6 is characterized in that, this optical microstructures is with hot pressing, ink printing, or the mode of ultraviolet curing is formed on this bottom surface.

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