TWI457621B - Display device, backlight module, silk screen, light guide plate and method for making a light guide plate - Google Patents

Description

Display device, backlight module, screen, light guide plate and light guide plate manufacturing method

The present invention relates to a display device, a backlight module, a screen, a light guide plate, and a method of manufacturing the light guide plate, and more particularly to a screen having a stud, a light guide plate provided with an ink layer having a hole, and a display including the light guide plate A device and a backlight module, and a method of manufacturing the same.

Referring to Figure 1, a cross-sectional view of a conventional backlight module is shown. The backlight module 1 includes a plurality of LEDs 11 and a light guide plate 10. These LEDs 11 are used to provide light. The light guide plate 10 includes a light guide body 12, an ink layer 13, and a reflective layer 14. The light guide body 12 includes a light emitting surface 121, a bottom surface 122, and a light incident surface 123. The bottom surface 122 is opposite to the light exit surface 121. The light incident surface 123 is located between the light emitting surface 121 and the bottom surface 122 and adjacent to the light emitting surface 121 and the bottom surface 122. The light incident surface 123 is a flat surface that receives light from the LEDs 11. Light from the LEDs 11 enters the light guide body 12 and is emitted through the light exit surface 121.

The ink layer 13 is formed on the bottom surface 122 by screen printing, and includes a plurality of dot arrays 131 arranged in an array. The ink layer 13 increases the uniformity of the light of the light exit surface 121. The material of the reflective layer 14 is usually a reflective sheet disposed adjacent to the bottom surface 122. The function of the reflective layer 14 is to reflect light back into the interior of the light guide body 12.

The light guide plate 10 of the conventional backlight module 1 can be used to derive light from the light exit surface 121 of the light guide plate 10 by using the ink dot technique. In addition, other techniques may be utilized, such as the light-emitting surface 121 of the light guide plate 10 having a V-shaped groove, or the light-emitting surface 121 of the light guide plate having an embossed structure for guiding light from the light-emitting surface 121 of the light guide plate 10.

Compared with the prior art, the present invention adopts an innovative and progressive light guide plate design to derive light from the light exit surface of the light guide plate.

The invention provides a light guide plate comprising a light guide plate body and an ink layer. The light guide plate body has a side surface and a first surface. The ink layer is disposed on the first surface of the light guide plate body and has a plurality of holes spaced apart from each other by a gap.

The invention further provides a screen comprising a mesh bottom layer and an upper layer. The mesh bottom layer has a plurality of network lines interlaced with each other. The upper layer is disposed on the bottom layer of the mesh and has a plurality of studs spaced apart from each other by a gap.

The invention further provides a method for manufacturing a light guide plate, comprising: (a) providing a light guide plate body, the light guide plate body having a side surface and a first surface; (b) providing a screen, the screen comprising a net a bottom layer of the yarn and an upper layer, the bottom layer of the mesh having a plurality of mesh lines and one side interlaced with each other, the upper layer being disposed on the bottom layer of the mesh, and having a plurality of studs, the studs being spaced apart from each other by a gap; c) placing the screen on the first surface of the light guide body, and the protrusions face the first surface of the light guide body; (d) applying an ink material to the bottom layer of the mesh, and the The ink material passes through the bottom layer of the mesh into the gap between the studs; and (e) the screen is removed to form an ink layer on the first surface of the light guide body, wherein the ink layer has a plurality of holes The holes are aligned with the studs, which are spaced apart from each other by a gap.

The invention further provides a display device comprising a backlight module as described above and a display panel. The display panel is oppositely disposed on the backlight module.

Referring to FIG. 2 and FIG. 3, a perspective view and a cross-sectional view of an embodiment of a backlight module of the present invention are respectively shown. The backlight module 3 includes a light source and a light guide plate 30. In this embodiment, the light source is a plurality of LEDs 31 for providing light. However, in other embodiments, the light source can be a cold cathode fluorescent tube (CCFL) or other light emitting element.

The light guide plate 30 includes a light guide body 32, an ink layer 33 and a reflective layer 34. The light guide body 32 includes a first surface 321 , a second surface 322 , and a side surface 323 . The first surface 321 is opposite the second surface 322. The side surface 323 is located between the first surface 321 and the second surface 322 and adjacent to the first surface 321 and the second surface 322.

In this embodiment, the light source is disposed adjacent to the side surface 323 of the light guide plate body 32, that is, the side surface 323 is a light incident surface, which is a flat surface and receives light from the light source. . Light from the light source enters the interior of the light guide body 32 and is emitted through the first surface 321 .

The ink layer 33 is disposed on the first surface 321 via screen printing and includes a plurality of holes 331. The holes 331 are arranged in an array and are spaced apart from each other by a gap. In the present embodiment, the holes 331 extend through the ink layer 33 and are substantially the same size. The ink layer 33 is used to derive light, and is a light exiting layer, that is, the surface of the ink layer 33 forms a light exiting surface. In other words, the ink portion of the ink layer 33 is used to emit light. Rather than absorbing light, the light flux from the first surface 321 through the ink portion of the ink layer 33 is greater than the light flux through the holes 331 of the ink layer 33.

The reflective layer 34 is disposed on the second surface 322 of the light guide body 32 for reflecting light back into the interior of the light guide body 32. In this embodiment, the material of the reflective layer 34 is also an ink, which is formed on the second surface 322 by printing. In other embodiments, the reflective layer 34 is a film that is attached to the second surface 322 or a backing plate (not shown).

Preferably, the backlight module 3 further includes at least one optical film (not shown) on the ink layer 33.

Referring to FIG. 4, a cross-sectional view showing another embodiment of the backlight module of the present invention is shown. The backlight module 4 of the present embodiment is substantially the same as the backlight module 3 of FIG. 3, wherein the same components are given the same reference numerals. The difference between the backlight module 4 of the present embodiment and the backlight module 3 of FIG. 3 is that, in the embodiment, the holes 331 do not penetrate the ink layer 33, that is, the holes 331 are blind holes.

Referring to Figures 5 and 6, there is shown a schematic diagram of an embodiment of a method of fabricating a light guide plate of the present invention. Referring to Figure 5, a light guide body 32 is provided. The light guide body 32 includes a first surface 321 , a second surface 322 , and a side surface 323 . Referring to Figure 6, a screen version 5 is provided. The screen 5 includes a mesh bottom layer 51 and an upper layer 52. The mesh bottom layer 51 has a plurality of mesh lines interlaced with each other. The upper layer 52 is disposed on the mesh bottom layer 51 and has a plurality of studs 521. The studs 521 are arranged in an array and are spaced apart from each other by a gap 522.

Then, the screen printing process is performed, the screen 5 is flipped 180 degrees, and then placed on the first surface 321 of the light guide body 32, and the protrusions 521 are facing the first surface of the light guide body 32. 321. In this embodiment, the protrusions 521 contact the first surface 321 of the light guide body 32.

Next, an ink material is applied to the mesh bottom layer 51, and the ink material passes through the mesh bottom layer 51 into the gap 522 between the posts 521.

Then, the screen 5 is removed to form an ink layer 33 on the first surface 321 of the light guide body 32, as shown in FIG. 2 and FIG. 3, wherein the ink layer 33 has a plurality of holes 331, the holes The 331 series corresponds to the studs 521 which are spaced apart from each other by a gap.

Then, a reflective layer 34 is formed on the second surface 322 of the light guide body 32 to form the light guide plate 30. In this embodiment, the material of the reflective layer 34 is also an ink, which is formed on the second surface 322 by printing. In other embodiments, the reflective layer 34 is a film that is attached to the second surface 322 or a backing plate (not shown).

Referring to FIG. 7, a perspective view of another embodiment of a backlight module of the present invention is shown. The backlight module 3a of the present embodiment is substantially the same as the backlight module 3 of FIG. 2, wherein the same components are given the same reference numerals. The difference between the backlight module 3a of the present embodiment and the backlight module 3 of FIG. 2 is that, in this embodiment, the aperture of the hole corresponding to the light source is larger. For example, the ink layer 33 includes a plurality of first holes 331a and a plurality of second holes 331b. The first holes 331a are arranged perpendicular to the side surface 323 of the light guide body 32, and the second holes 331b are parallel to the first holes 331a. The positions of the first holes 331a are corresponding to the light source, and the holes of the first holes 331a The diameter is larger than the aperture of the second holes 331b.

Referring to FIG. 8, a perspective view of another embodiment of a backlight module of the present invention is shown. The backlight module 3b of the present embodiment is substantially the same as the backlight module 3 of FIG. 2, wherein the same components are given the same reference numerals. The difference between the backlight module 3b of the present embodiment and the backlight module 3 of FIG. 2 is that, in this embodiment, the hole closer to the side surface 323 of the light guide plate body 32 has a larger aperture and a smaller gap. For example, the ink layer 33 includes a plurality of third holes 331c and a plurality of fourth holes 331d. The third holes 331c are arranged in parallel with the side surface 323 of the light guide plate body 32, and the fourth holes 331d are parallel to the third holes 331c. The third holes 331c are closer to the side surface 323 of the light guide plate body 32 than the fourth holes 331d. The holes of the third holes 331c are larger than the holes of the fourth holes 331d, and the third holes 331c The gap is smaller than the gap of the fourth holes 331d.

Referring to Figure 9, a perspective view of another embodiment of the screen of the present invention is shown. The screen 5a of the present embodiment is substantially the same as the screen 5 of Fig. 6, wherein the same elements are given the same reference numerals. The difference between the screen 5a of the embodiment and the screen 5 of FIG. 6 is that, in this embodiment, the cross-sectional area of the stud corresponding to a position of the light source is larger. For example, the upper layer 52 includes a plurality of first protrusions 521a and a plurality of second protrusions 521b. The first protrusions 521a are arranged in a direction perpendicular to one side 511 of the mesh bottom layer 51, and the second protrusions 521b are parallel to the first protrusions 521a. The positions of the first protrusions 521a are corresponding to the light source, and the cross-sectional areas of the first protrusions 521a are larger than the cross-sectional areas of the second protrusions 521b. The screen 5a of this embodiment is used to form the ink layer 33 of FIG.

Referring to Figure 10, there is shown a perspective view of another embodiment of the screen of the present invention. The screen 5b of the present embodiment is substantially the same as the screen 5 of Fig. 6, wherein the same elements are given the same reference numerals. The difference between the screen 5b of the present embodiment and the screen 5 of FIG. 6 is that, in this embodiment, the cross-sectional area of the stud closer to one side 511 of the mesh bottom layer 51 is larger and the gap is smaller. For example, the upper layer 52 includes a plurality of third protrusions 521c and a plurality of fourth protrusions 521d. The third protrusions 521c are arranged in parallel with the side 511 of the mesh bottom layer 51, and the fourth protrusions 521d are parallel to the third protrusions 521c. The third protrusions 521c are closer to the side edges 511 of the mesh bottom layer 51 than the fourth protrusions 521d. The cross-sectional areas of the third protrusions 521c are larger than the cross-sectional areas of the fourth protrusions 521d. The gap between the third protrusions 521c is smaller than the gap between the fourth protrusions 521d. The screen 5b of this embodiment is used to form the ink layer 33 of FIG.

Referring to Figure 11, there is shown a cross-sectional schematic view of one embodiment of a display device of the present invention. The display device 6 includes a backlight module 3 and a display panel 61. The display panel 61 is disposed opposite to the backlight module 3 . In this embodiment, the backlight module 3 is the backlight module 3 shown in FIGS. 2 and 3. In other embodiments, the backlight module 3 can be replaced with the backlight module 4 of FIG. 4, the backlight module 3a of FIG. 7, or the backlight module 3b of FIG.

The present invention is based on a different light guide plate design (the ink layer 33 having a hole structure is disposed on the first surface 321 of the light guide plate body 32) and its corresponding design (screen, light guide manufacturing method, etc.) To evenly direct light from the first surface 321 of the light guide body 32. The technical advantages of the present invention are two. First, the conventional dot 131 is attached to the single point structure. The light guide plate body 12 is as shown in FIG. 1 . However, during the manufacturing process of the backlight module 1 , the light guide plate 10 may contact or rub with other components or the work table, so that the dot 131 may be easily detached/ The situation, in turn, affects the nature of light. On the other hand, the ink layer 33 of the present invention is a large-area arrangement, and it is obviously less likely to cause a drop-off situation compared with the prior art, thereby avoiding affecting the light-emitting property of the light guide plate 30. Secondly, in order to fabricate the dot 131 structure, it is necessary to have a corresponding screen hole, and as the conventional technique wants to make the dot 131 structure smaller and smaller, the ink is too small to pass through the hole because the hole of the screen is too small. However, it is difficult to form the desired dot 131 structure. However, in the present invention, there is no problem that the mesh hole is too small to pass the ink. It is obvious that the present invention has no conventional process limitation (the hole is too small and the ink is not easily passed).

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims.

1‧‧‧Study backlight module

3‧‧‧One embodiment of the backlight module of the present invention

3a‧‧‧Another embodiment of the backlight module of the present invention

3b‧‧‧Another embodiment of the backlight module of the present invention

4‧‧‧Another embodiment of the backlight module of the present invention

5‧‧‧ Screen

5a‧‧‧Another embodiment of the screen of the invention

5b‧‧‧Another embodiment of the invention screen

6‧‧‧An embodiment of the display device of the present invention

10‧‧‧Light guide plate

11‧‧‧LED

12‧‧‧Light guide body

13‧‧‧Ink layer

14‧‧‧reflective layer

30‧‧‧Light guide

31‧‧‧LED

32‧‧‧Light guide body

33‧‧‧Ink layer

34‧‧‧reflective layer

51‧‧‧ mesh bottom layer

52‧‧‧Upper

61‧‧‧ display panel

121‧‧‧Glossy

122‧‧‧ bottom

123‧‧‧Into the glossy surface

131‧‧‧ outlets

321‧‧‧ first surface

322‧‧‧ second surface

323‧‧‧ side

331‧‧‧ hole

331a‧‧‧First hole

331b‧‧‧Second hole

331c‧‧‧ third hole

331d‧‧‧4th hole

511‧‧‧ side

521‧‧‧ stud

521a‧‧‧first stud

521b‧‧‧second stud

521c‧‧‧third stud

521d‧‧‧fourth pillar

522‧‧‧ gap

1 is a schematic cross-sectional view showing a conventional backlight module; FIG. 2 is a schematic cross-sectional view showing an embodiment of the backlight module of the present invention; FIG. 3 is a cross-sectional view showing an embodiment of the backlight module of the present invention; FIG. 5 is a schematic cross-sectional view showing another embodiment of a backlight module of the present invention; FIG. 7 is a schematic perspective view showing another embodiment of the backlight module of the present invention; 8 is a perspective view showing another embodiment of the backlight module of the present invention; Figure 9 is a perspective view showing another embodiment of the screen of the present invention; Figure 10 is a perspective view showing another embodiment of the screen of the present invention; and Figure 11 is a schematic cross-sectional view showing an embodiment of the display device of the present invention.

3. . . One embodiment of the backlight module of the present invention

30. . . Light guide

31. . . led

32. . . Light guide body

33. . . Ink layer

34. . . Reflective layer

321. . . First surface

322. . . Second surface

323. . . side

331. . . Hole

Claims (23)

A light guide plate comprising: a light guide plate body having a side surface and a first surface; and an ink layer disposed on the first surface of the light guide plate body, wherein the ink layer is a light exit layer, and the ink The surface of the layer forms a light exiting surface, and the ink layer has a plurality of holes which are spaced apart from each other by a gap. The light guide plate of claim 1, wherein the ink layer is printed on the first surface of the light guide plate body. The light guide of claim 1, wherein the holes penetrate the ink layer. The light guide plate of claim 1, wherein a hole closer to the side of the light guide plate body is larger. The light guide plate of claim 1, wherein the gap between the holes closer to the side surface of the light guide plate body is smaller. The light guide plate of claim 1, wherein the holes comprise a plurality of first holes and a plurality of second holes, the first holes are arranged perpendicular to the side of the light guide body, and the second holes are parallel The first holes, and the holes of the first holes are larger than the holes of the second holes. The light guide plate of claim 1, further comprising a reflective layer, the light guide plate body further having a second surface corresponding to the first surface, and the reflective layer is disposed on the second surface. A screen comprising: a bottom layer of a mesh having a plurality of network lines and one side interlaced with each other, The plurality of first studs and the plurality of second studs are arranged in a direction perpendicular to the side of the bottom layer of the mesh, and the second studs are parallel to the first a protruding column, and the cross-sectional area of the first protruding columns is larger than the sectional area of the second protruding columns; and an upper layer disposed on the bottom layer of the mesh, and having a plurality of protruding columns spaced apart from each other A gap. The screen of claim 8, wherein the material of the upper layer is a light-sensitive material, and the pillars are formed by etching. The screen of claim 8, wherein the bottom layer of the mesh has a side edge, and the cross-sectional area of the stud near the side of the bottom layer of the mesh is larger. The screen of claim 8, wherein the bottom layer of the mesh has a side edge, and the gap between the studs of the side edge of the bottom layer of the mesh is smaller. A method for manufacturing a light guide plate, comprising: (a) providing a light guide plate body having a side surface and a first surface; (b) providing a screen plate comprising a mesh bottom layer and an upper layer The bottom layer of the mesh has a plurality of mesh lines and one side interlaced with each other, the upper layer is disposed on the bottom layer of the mesh, and has a plurality of protrusions, the protrusions are spaced apart from each other by a gap; (c) placing the same a screen is disposed on the first surface of the light guide body, and the protrusions face the first surface of the light guide body; (d) an ink material is applied to the bottom layer of the mesh, and the ink material passes through the a bottom layer of the mesh enters the gap between the studs; and (e) removing the screen to form an ink layer on the body of the light guide plate a surface, wherein the ink layer has a plurality of holes corresponding to the protrusions, which are spaced apart from each other by a gap, the holes including a plurality of first holes and a plurality of second holes, the first holes The alignment direction is perpendicular to the side surface of the light guide plate body, the second holes are parallel to the first holes, and the apertures of the first holes are larger than the apertures of the second holes. The manufacturing method of claim 12, wherein in the step (c), the pillars contact the first surface of the light guide body, and in the step (e), the holes penetrate the ink layer. The manufacturing method of claim 12, wherein in the step (e), the closer to the hole of the side surface of the light guide plate body, the larger the aperture and the smaller the gap. The manufacturing method of claim 12, wherein in the step (a), the light guide plate body further has a second surface corresponding to the first surface, and after the step (e), the method further comprises: forming a reflective layer In the step of the second surface, the ink layer is a light exiting layer, and the surface of the ink layer forms a light exiting surface. A backlight module includes: a light guide plate, comprising: a light guide plate body having a side surface and a first surface; and an ink layer disposed on the first surface of the light guide plate body, wherein the ink layer is a light-emitting layer, and a surface of the ink layer forms a light-emitting surface, the ink layer has a plurality of holes, the holes are spaced apart from each other by a gap; and a light source for providing a light, the light source is disposed adjacent to the light guide The side of the light plate body. The backlight module of claim 16, wherein the holes extend through the ink layer. The backlight module of claim 16, wherein the aperture closer to the side of the light guide plate body is larger. The backlight module of claim 16, wherein the holes comprise a plurality of first holes and a plurality of second holes, the first holes are arranged perpendicular to the side of the light guide body, and the second holes are The first holes are parallel to each other, and the apertures of the first holes are larger than the apertures of the second holes. The backlight module of claim 19, wherein the positions of the first holes are corresponding to the light source. The backlight module of claim 16, wherein the light guide plate further comprises a reflective layer, the light guide plate body further has a second surface corresponding to the first surface, and the reflective layer is disposed on the second surface. The backlight module of claim 16, further comprising at least one optical film on the ink layer. A display device, comprising: the backlight module of claim 16; and a display panel disposed opposite to the backlight module.