TWI624716B - Backlight module of liquid crystal display and manufacturing method thereof - Google Patents

Abstract

The invention provides a backlight module of a liquid crystal display, and the backlight module comprises: a light guide plate and a back plate. The light guide plate includes a bottom surface and a plurality of microstructures formed on the bottom surface, and the back plate includes a back plate body and a reflective material, wherein the back plate body has an inner surface and an outer surface, the inner surface is a plane, and the reflection A material is formed on the inner surface, the inner surface of the backing plate being disposed relative to the bottom surface of the light guide plate. The invention also provides a method for manufacturing a backlight module of a liquid crystal display, the manufacturing method comprising: providing a back plate having a back plate body, the back plate body having an inner surface and an outer surface, the inner surface being a plane; forming a reflective material Providing a light guide plate having a first surface, a second surface, and a plurality of microstructures; and arranging the light guide plate and the back plate such that the inner surface is opposite to the second surface.

Description

Backlight module of liquid crystal display and manufacturing method thereof

The present invention relates to a backlight module for a liquid crystal display and a method of fabricating the same, and more particularly to a backlight module including a back plate body having a reflective material and a method of fabricating the same.

The conventional liquid crystal display backlight module mainly has a light source, a light guide plate, an optical glue, a reflection sheet and a back plate, wherein the reflection sheet is bonded to the light guide plate by an optical glue. In order to enable most of the light emitted from the light source to reach the liquid crystal display panel, a plurality of dot microstructures are formed on one side of the light guide plate, and the face of the light guide plate having the dot microstructure is bonded through the optical adhesive and the reflective sheet. The pattern design on the dot microstructure can destroy the total reflection in the light guide. The light emitted by the light source enters the light guide plate from the light incident surface of the light guide plate. When the dot structure is reached, it will not be reflected but will be refracted. In this case, the reflective sheet attached to the light guide plate can be used for the reflective sheet. The reflected light is guided to the liquid crystal display panel via the light emitting surface of the light guide plate.

The manufacturing method of the conventional liquid crystal display backlight module generally comprises the steps of: providing a substrate as a light guide plate; forming a plurality of microstructures having the designed screen pattern on the bottom surface of the substrate by using a screen printing technique; providing optical glue and a reflective sheet, the reflective surface of the reflective sheet is bonded to the bottom surface of the light guide plate via an optical adhesive; a back plate having a peripheral frame is provided, and the light guide plate is fixed on the peripheral frame of the back plate; the light source is provided, and the back plate is provided The frame of the circumference is arranged in the light guide plate The outside of the glossy surface provides light to the light guide plate. After the above main steps are completed, the conventional liquid crystal display backlight module has been substantially completed.

However, in the process of manufacturing the backlight module of the liquid crystal display, the light guide plate and the reflection sheet are not easy to be attached, and a high technical threshold is required to complete, which causes manufacturing difficulties, thereby making the manufacturing time longer. Therefore, if this problem can be overcome, the manufacturing speed of the liquid crystal display backlight module can be accelerated and the manufacturing cost can be reduced.

In order to overcome the problems caused by the prior art, the inventors have proposed a backlight module for a liquid crystal display and a method of manufacturing the same according to the present invention, which can speed up the manufacturing speed of a liquid crystal display backlight module by using the structure, device and manufacturing method of the present invention. Reduce manufacturing costs and make them thinner.

The invention provides a backlight module of a liquid crystal display, and the backlight module comprises: a light guide plate and a back plate. The light guide plate includes a bottom surface and a plurality of microstructures formed on the bottom surface, and the back plate includes a back plate body and a reflective material, wherein the back plate body has an inner surface and an outer surface, the inner surface is a plane, and the reflection A material is formed on the inner surface, the inner surface of the backing plate being disposed relative to the bottom surface of the light guide plate.

Preferably, the backlight module further includes an air gap layer disposed between the light guide plate and the back plate such that the light guide plate and the back plate do not engage each other.

Preferably, the backlight module as described above, wherein the reflective material is one of copper, silver, gold, aluminum, and combinations thereof.

Preferably, the backlight module is configured as described above, wherein the reflective material is formed on the inner surface by coating, electroplating or vapor deposition.

Preferably, the backlight module as described above, wherein the back panel further comprises a peripheral frame disposed at a periphery of the backboard body to be connected to the inner surface.

Preferably, the backlight module is as described above, wherein the back plate is a glass back plate, a metal back plate or an acrylic back plate.

Preferably, the backlight module as described above, wherein the back plate body and the reflective material use the same material.

The invention also provides a method for manufacturing a backlight module of a liquid crystal display, the manufacturing method comprising: providing a back plate having a back plate body, the back plate body having an inner surface and an outer surface, the inner surface being a plane; forming a reflective material Providing a light guide plate having a first surface, a second surface, and a plurality of microstructures; and arranging the light guide plate and the back plate such that the inner surface is opposite to the second surface.

Preferably, the manufacturing method as described above, wherein the step of forming the reflective material further comprises using a coating method, an electroplating plating method or a vapor deposition method to form the reflective material on the inner surface.

Preferably, the manufacturing method as described above, wherein the backing plate body and the reflective material use the same material.

The light guiding layer of the present invention does not need to be attached to the reflective sheet, thereby reducing the complexity of assembly. The backlight module using the liquid crystal display of the present invention and the manufacturing method thereof can speed up the manufacturing speed and reduce the manufacturing cost, and can also make it Thin.

100‧‧‧LCD module backlight module

110‧‧‧Lighting unit

120‧‧‧Light guide

121‧‧‧Microstructure

122‧‧‧Into the glossy surface

123‧‧‧Glossy

124‧‧‧ bottom

130‧‧‧ Backplane

131‧‧‧backplane body

131a‧‧‧ inner surface

131b‧‧‧ outer surface

132‧‧‧Reflective materials

133‧‧‧ week box

140‧‧‧Air gap layer

200‧‧‧LCD backlight module

210‧‧‧Lighting unit

220‧‧‧Light guide plate

221‧‧‧Microstructure

222‧‧‧ into the glossy surface

223‧‧‧Glossy

224‧‧‧ bottom

230‧‧‧ Backplane

231‧‧‧backplane body

232‧‧‧Reflective materials

233‧‧‧ week box

240‧‧‧ gap layer

300‧‧‧Manufacturing method of the invention

S310‧‧‧Step 310

S320‧‧‧Step 320

S330‧‧‧Step 330

S340‧‧‧Step 340

1(a) and 1(b) are schematic views of a first embodiment of the present invention; 2 is a schematic view of a second embodiment of the present invention; and FIG. 3 is a flow chart of a method for manufacturing a backlight module of a liquid crystal display according to the present invention.

Please refer to Figures 1(a) and 1(b) for a first embodiment of the present invention. The backlight module 100 of the liquid crystal display has a light emitting unit 110, a light guide plate 120, a back plate 130 and an air gap layer 140. The light guide plate 120 has a plurality of microstructures 121, a light incident surface 122, a light exit surface 123 and a bottom surface 124, and the back surface The plate 130 has a back plate body 131, a reflective material 132, and a perimeter frame 133.

The light emitting unit 110 is configured to provide light to the light guide plate 120, and the light emitted by the light emitting unit 110 reaches the liquid crystal display panel (not shown) through the reflective material 132 of the light guide plate 120 and the back plate 130, thereby providing a surface light source. Give the LCD monitor. The light emitting unit 110 may be a light-emitting diode (LED), a cold cathode fluorescent lamp (CCFL) or an element having a light emitting function. Further, the light emitting unit 110 may preferably be a light emitting strip. .

The light guide plate 120 is configured to guide the light emitted by the light emitting unit 110. The light emitted by the light emitting unit 110 first enters the light guide plate 120 through the light incident surface 122 of the light guide plate 120, and part of the light is passed through the reflection principle. The light-emitting surface 123 emits the light guide plate 120, but part of the light is transmitted in the light guide plate 120 due to the principle of total reflection, and cannot be guided out of the light guide plate 120. In order to solve this problem, a plurality of microstructures 121 are disposed on the bottom surface 124 of the light guide plate 120. The plurality of microstructures 121 have a pattern that can completely reflect the total reflection in the light guide plate 120. In other words, the light emitted by the light emitting unit 110 is on the light guide plate. After entering total reflection in 120, if the light is reflected to one of the plurality of microstructures 121, the pattern on the microstructure will The light is refracted away from the state of total reflection. In addition, the light guide plate 120 of the backlight module 100 may be an acrylic light guide plate, a glass light guide plate or a light guide plate of other materials.

The back plate 130 is configured to carry the light emitting unit 110 and the light guide plate 120 and provide a function of reflection. If the backlight module 100 has other optical layers, the other optical layers may be carried by the back plate 130 in a manner of being fixed to the peripheral frame or sandwiched, for example, a diffusion sheet, a cymbal sheet, or the like. The backplane body 131 of the backplane 130 has an inner surface 131a and an outer surface 131b, and the inner surface 131a is a plane. The peripheral frame 133 is disposed at a periphery of the backplane body 131 and configured to carry the light emitting unit 110, the light guide plate 120 or / and other optical layers. The backing plate 130 may be a glass backing plate (including tempered glass), a metal backing plate, an acrylic backing plate or other backing plate having a supporting effect. In addition, the back plate 130 can also serve as the outer casing of the liquid crystal display, and the inner surface 131a of the back plate body 131 does not have grooves or holes and is a complete plane. The peripheral frame 133 can also be designed to form a curved or non-planar surface when the peripheral frame 133 and the inner surface 131a are joined, and the completely flat inner surface 131a corresponds in principle to the light guide plate 120.

The reflective material 132 is formed on the inner surface 131a of the back plate body 131, so that the backlight module 100 has a reflection effect. When the light emitted by the light emitting unit 110 is refracted by the plurality of microstructures 121 of the light guide plate 120, the refracting The light is transmitted to the reflective material 132 of the back plate body 131, and then the light is reflected back to the light guide plate 120 via the reflective material 132, and finally transmitted to the light guide plate 120 via the light exit surface 123. The reflective material 132 can be copper, silver, gold, aluminum or other material having reflective properties, and can be any combination of the above materials. Further, the reflective material 132 may be formed on the inner surface 131a by a coating method, a plating method, a vapor deposition method, or the like. It should be noted that the back plate body 131 and the reflective material 132 may use the same material having reflective properties, in other words, the back plate body 131 is shaped. It has the effect of reflection when it is formed.

In the process of combining the light emitting unit 110, the light guide plate 120 and the back plate 130, the light guide plate 120 is fixed on the peripheral frame 133 of the back plate 130 or is limited to a range, and the light guide plate 120 and the back plate body 131 are inside. There is a distance between the reflective materials 132 on the surface 131a, thereby forming an air gap layer 140. Due to the presence of the air gap layer 140, the light guide plate 120 and the back plate 130 are not bonded to each other. In addition, in addition to the manner of being fixed to the peripheral frame, the light guide plate 120 may not be arbitrarily moved in the backlight module 100 by sandwiching.

Please refer to FIG. 2, which is a schematic view of a second embodiment of the present invention. The backlight module 200 of the liquid crystal display has a light-emitting unit 210, a light guide plate 220, a back plate 230 and a gap layer 240. The light guide plate 220 has a plurality of microstructures 221, a light-incident surface 222, a light-emitting surface 223 and a bottom surface 224, and the back plate 230 has a back plate body 231, a reflective material 232, and a perimeter frame 233. The back plate 230 is configured to carry the light emitting unit 210 and the light guide plate 220 , and the plurality of microstructures 221 are disposed on the bottom surface 224 of the light guide plate 220 .

In the second embodiment of the present invention, the reflective material 232 is at least partially covered on the inner surface of the back plate body by a coating method, a plating method, a vapor deposition method or other conventional methods to form a plurality of regions having the reflective material 232. The relative positions or shapes of the plurality of regions can be designed according to requirements. Since the reflective material 232 does not entirely cover the inner surface of the backplane body, the amount of reflective material used can be saved to control cost, especially using high-priced reflective materials.

In the second embodiment of the present invention, the liquid crystal display panel 400 is disposed outside the light-emitting surface 223 of the light guide plate 220 of the backlight module 200, and the light emitted by the light-emitting unit 210 enters the light guide plate from the light-incident surface 222 of the light guide plate 220. In 220, part of the light will be reflected and folded. The light is transmitted from the light-emitting surface 223 to the liquid crystal display panel 400, and another portion of the light that conforms to the total reflection condition in the light guide plate 220 is refracted to the light guide plate 220 when being transmitted to the plurality of microstructures 221, and then transmitted to the back plate. The reflective material 232 on the inner surface of the body 231 enters the light guide plate 220 via reflection, and is guided from the light exit surface 223 to the liquid crystal display panel 400.

Please refer to FIG. 3 , which is a flow chart of a method for manufacturing a backlight module of a liquid crystal display according to the present invention. The manufacturing method 300 includes the steps of: providing a backing plate having a backing plate body having an inner surface and an outer surface, the inner surface being a plane (step 310); forming a reflective material on the inner surface (step 320) Providing a light guide plate having a first surface, a second surface, and a plurality of microstructures (step 330); and arranging the light guide plate and the back plate such that the inner surface is opposite to the second surface (step 340) ). The steps in the manufacturing method 300 will be further described below.

In the manufacturing method 300 of the present invention, the back plate provided in step 310 may be a glass back plate, a metal back plate, an acrylic back plate or other backing plate having a supporting effect, wherein the inner surface of the back plate body does not have a groove. Or a hole, for a complete plane. In addition, the backboard may have an outer frame in addition to the outer surface of the backplane. In the case of having an outer frame, the outer frame is coupled to the edge of the backplane body to form the backplane.

In step 320 of the manufacturing method 300 of the present invention, the reflective material is formed on the inner surface by using a coating method, a plating method, a vapor deposition method or other conventional methods, and the reflective material is formed on at least a part of the inner surface, and the reflective material may be It is copper, silver, gold, aluminum or other materials with reflective properties, and may be any combination of the above materials. After step 320, the backplane body will have a reflective function to reflect light refracted to the backplate back to the light guide. It is worth noting that the same material having reflective properties can be used for the backing plate body and the reflective material.

The light guide plate provided in step 330 of the manufacturing method 300 of the present invention may be an acrylic light guide plate, a glass light guide plate or a light guide plate of other materials, and a plurality of microstructures are formed on the second surface, and the plurality of microstructures The upper pattern can break the total reflection in the light guide plate and transmit the light refracted via the microstructure to the reflective material of the back plate body.

Step 340 in the manufacturing method 300 of the present invention is configured such that the second surface of the light guide plate is disposed relative to the inner surface of the back plate body, and the light guide plate and the back plate, that is, the second surface of the light guide plate having a plurality of microstructures are oriented. The inner surface of the back plate body forms a backlight module of the liquid crystal display.

The above is only the preferred embodiment of the present invention, and is not limited to the embodiment of the present invention. The simple or equivalent changes of the disclosure of the patent application scope and patent specification of the present invention should still belong to the present invention. Coverage.

Claims (10)

A backlight module of a liquid crystal display, comprising: a light guide plate comprising a bottom surface and a plurality of microstructures formed on the bottom surface; a back plate comprising a back plate body and a reflective material to provide a bearing function and a reflection Functionally, the backing plate body has an inner surface and an outer surface, the inner surface is a flat surface, and the reflective material is formed on the inner surface, wherein the reflective material on the inner surface of the backing plate is configured to be opposite to The bottom surface of the light guide plate is configured to reflect a light refracted through the plurality of microstructures; and an air gap layer disposed between the light guide plate and the back plate such that the light guide plate and the back plate The plates do not engage each other. The backlight module of claim 1, wherein the reflective material partially covers the inner surface of the back plate body to form a plurality of regions having the reflective material, the plurality of regions respectively corresponding to A plurality of microstructures. The backlight module of claim 1, wherein the reflective material is one of copper, silver, gold, aluminum, and combinations thereof. The backlight module of claim 1, wherein the reflective material is formed on the inner surface by one of a coating method, an electroplating method, and a vapor deposition method. The backlight module of claim 1, wherein the backplane further comprises a peripheral frame disposed on a periphery of the backplane body to be connected to the inner surface. The backlight module of claim 1, wherein the back plate is one of a glass back plate, a metal back plate and an acrylic back plate. The backlight module of claim 1, wherein the back plate body and the reflective material The same material is used for the material. A method for manufacturing a backlight module of a liquid crystal display, comprising: providing a back plate having a back plate body, the back plate body having an inner surface and an outer surface, wherein the inner surface is a flat surface; and a reflective material is formed therein a light guide plate having a first surface, a second surface and a plurality of microstructures, and a light guide plate and the back plate for arranging the light guide plate The reflective material on the surface is opposite the second side, wherein the reflective material is configured to reflect a ray refracted through the plurality of microstructures. The manufacturing method of claim 8, wherein the step of forming the reflective material further comprises using one of a coating method, an electroplating method, and a vapor deposition method to partially cover the reflective material. On the inner surface, a plurality of regions having the reflective material are formed, and the plurality of regions respectively correspond to a plurality of microstructures. The manufacturing method of claim 8, wherein the back sheet body and the reflective material use the same material.