TWI390302B - Back light module and optical device using the same - Google Patents

Description

Backlight module and optoelectronic device including the same

The invention relates to a backlight module and a photoelectric device including the backlight module, in particular to a side-lighting type backlight module and a photoelectric device including the same.

A liquid crystal display device such as a screen of a notebook computer and a television screen generally includes a backlight module and a liquid crystal panel adjacent to the backlight module. In general, according to the manner in which the backlights of the backlight module are relative to the relative positions of the backlight modules, the backlight modules can be generally classified into a side-lit backlight module and a direct-lit backlight module. The light source of the side-lit backlight module is located on the side of the backlight module, and since the light source of the direct-lit backlight module is located on the lower side of the backlight module, the side-lighting backlight is under the same size condition. The thickness of the module is often thinner than the thickness of the direct type backlight module.

The conventional edge-lit backlight module utilizes a light-emitting element such as a Cold Cathode Fluorescent Lamp (CCFL) lamp or a Light Emitting Diode (LED) located on the side of the backlight module. LED) produces a source of visible light. In addition, a conventional side-lit backlight module introduces light into a light guide plate by a amp holder and a reflector. When the light enters the light guide plate, the light is reflected in the light guide plate and uniformly emitted from the light guide plate outside the light guide plate.

The structure of the backlight module of the side-in-light type, the Taiwan Patent Application No. 200743850 (hereinafter referred to as the application No. 200743850) is a circuit board for fixing a light-emitting diode by using a double-sided tape. Reflective sheet and light guide plate. The following component codes are described in the application No. 200743850. This fixing method achieves the purpose of fixing the reflective sheet and the light guide plate by the circuit substrate of the light emitting diode. The two surfaces of one end of the double-sided tape are respectively bonded to the circuit substrate and the light guide plate of the light-emitting diode, and the other surfaces of the two ends are respectively bonded to the reflective sheet and a frame for accommodating the backlight module component. Among them, the area of the underlying rubber on the double-sided tape is the same.

However, such a fixing method causes a gap in the reflection sheet and the light guide plate, and the thickness of the gap is the thickness of the circuit substrate of the light-emitting diode plus the thickness of the double-sided tape. As a result, part of the light emitted by the light source may leak through the gap between the reflective sheet and the light guide plate, thereby reducing the utilization of light. In addition, the structure of the backlight module disclosed in the application No. 200743850 increases the difficulty in assembling the backlight module, thereby affecting the assembly efficiency.

In addition, the Taiwan Patent Application No. 200722834 (hereinafter referred to as the application No. 200722834) utilizes a double-sided adhesive metal film to directly adhere to a substrate of the light guide plate in the liquid crystal panel. Please refer to the application No. 200722834 for the following components. The double-sided adhesive metal film is disposed around the first polarizing plate and directly bonds the first substrate of the liquid crystal display panel and the first surface of the light guide plate. In general, the double-sided adhesive metal film comprises an opaque metal layer and a reflective metal layer, wherein the opaque metal layer has a light absorbing surface facing the first substrate and serving as a light shielding layer for shielding light. To avoid affecting the drive wafer disposed on the extension of the first substrate. The application No. 200722834 also uses a double-sided adhesive metal film to fix the light guide plate and the reflective layer in the backlight module. A top surface of the double-sided adhesive metal film directly adheres to a part of the bottom surface of the light guide plate, and a bottom surface of the double-sided adhesive metal film directly adheres to a part of the metal layer of the rigid circuit board having the wafer, and the light guide plate A gap is formed between one side of the metal layer and one side of the double-sided adhesive metal film, and the reflective layer is disposed in the gap, and one side of the reflective layer is directly connected to one side of the double-sided adhesive metal film.

However, in this design, the contact area between the side of the double-sided adhesive metal film and the side of the reflective layer depends on the thickness of the double-sided adhesive metal film. Since the reflective layer is disposed in the above-mentioned space without any adhesive substance in the position where the void and the reflective layer exist, such a design tends to cause the connection state between the double-sided adhesive metal film and the reflective layer to be unstable.

Based on the above, the prior art method of fixing the reflector and the light guide plate has the problems of low utilization of the light source, unstable fixing manner, and complicated assembly process, resulting in high production cost.

In view of the above problems, an object of the present invention is to provide a backlight module and a photovoltaic device including the same, which are used for simultaneously fixing a reflector and a light guide plate and improving assembly efficiency and quality of the backlight module.

In order to achieve the above object, the present invention provides a backlight module including a metal frame, a light source, a first adhesive layer, a substrate, a reflective plate, and a light guide plate. The metal frame has an annular flange projecting from an inner surface of the metal frame, and the metal frame has a first side and a second side. The light source is located on the annular flange and is located on the first side of the metal frame. The first adhesive layer is adhered to the annular flange and is located on the second side of the metal frame, and the substrate is bonded to the first adhesive layer. The reflector is disposed on the annular flange, and one side edge of the reflector is attached to the first adhesive layer. The light guide plate is disposed on the reflective plate, and one side edge of the light guide plate is adhered to the substrate.

According to an embodiment of the invention, the first side and the second side of the metal frame may be opposite sides of the metal frame. The other side edge of the reflector extends toward the first side and rests against the annular flange in a movable manner relative to the annular flange. The light guide plate is placed against the reflector in such a manner as to be movable relative to the reflector.

According to another embodiment of the present invention, the backlight module further includes a second adhesive layer. The metal frame may have a third side, and the second side and the third side are opposite sides of the metal frame. The second adhesive layer is adhered to the annular flange, and the second adhesive layer is located on the third side. The other side edge of the reflector is attached to the second adhesive layer, and the other side edge of the light guide plate is adhered to the annular flange and is located on the third side of the metal frame.

According to the present invention, the backlight module may further include a plurality of optical films disposed on the light guide plate. In addition, the backlight module may further include a fixing frame, and the fixing frame is disposed on the annular flange. The fixing frame has a protruding portion protruding from an inner surface of the fixing frame. The projections abut on the optical film to fix the relative positions of the optical film and the light guide plate.

The present invention also provides an optoelectronic device, comprising the foregoing backlight module, and a display panel, wherein the display panel is disposed on the backlight module.

Based on the above, since the above embodiment is to fix the reflector to the first adhesive layer, and to fix the light guide plate to the adhesive layer via the substrate, the steps and the assembly steps can be reduced in the above embodiment. Degree to improve assembly efficiency and save assembly labor costs.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art.

The detailed features and advantages of the present invention are described in the following detailed description of the present invention, which is to be understood by those skilled in the art to understand the technical contents of the present invention, and in accordance with the disclosure, the scope of the application, and the drawings, The related objects and advantages of the present invention will be readily understood by those skilled in the art.

FIG. 1 is a top plan view of a backlight module according to an embodiment of the invention. "Picture 2" is a schematic cross-sectional view taken along line 2-2 of "Fig. 1". Please refer to "Figure 1" and "Figure 2" together. The backlight module 20 includes a metal frame 25, a light source 40, a first adhesive layer 45, a substrate 50, a reflective plate 55, and a light guide plate 60.

The metal frame 25 is a frame that surrounds and houses the module components such as the light guide plate 60, the reflection plate 55, and the light source 40. The material of the metal frame 25 may be a single metal such as iron, or an alloy such as an aluminum-magnesium alloy, an aluminum alloy, or other suitable material. The metal frame 25 includes an annular flange 30 that projects from an inner surface 35 of the metal frame 25. In more detail, the outer edge of the annular flange 30 is connected to the inner surface 35 of the metal frame 25. The annular flange 30 forms an angle with the inner surface 35 such that the reflecting plate 55 is disposed on the annular flange 30, and the light guiding plate 60 is disposed on the reflecting plate 55. Preferably, the annular flange 30 forms an angle of about ninety degrees with the inner surface 35, but is not limited thereto. The metal frame 25 has a first side 26 and a second side 27 opposite each other. In other words, the annular flange 30 may be referred to as the bottom surface of the metal frame 25, and the metal frame 25 and the side of the light guide plate 60 are substantially parallel, which may be referred to as the side surface of the metal frame 25, and the inner surface 35 of the side surface. The inner surface of the annular flange (bottom surface) 30 is joined, and the reflecting plate 55 is disposed on the inner surface of the bottom surface.

The light source 40 may be a cold cathode fluorescent tube or a combination of a plurality of light emitting diodes. Light source 40 is located on annular flange 30 of metal frame 25 and is located on first side 26 of metal frame 25.

Both sides of the first adhesive layer 45 are viscous, that is, the first adhesive face 46 and the second adhesive face 47. The first adhesive layer 45 is disposed on the second side 27 of the annular flange 30. That is, the first adhesive layer 45 is disposed on the second side 27 of the inner surface of the annular flange (bottom surface) 30. For example, the first adhesive layer 45 is a double-sided tape or a glue, and the second adhesive surface 47 is attached to the annular flange 30.

The material of the substrate 50 may be, but not limited to, acrylic or foam. Preferably, the thickness of the substrate 50 is about equal to that of the reflecting plate 55, so that the surface of the reflecting plate 55 that is not adhered to the first adhesive layer 45 and the surface of the substrate 55 that is not adhered to the first adhesive layer 45 are substantially flat. (in the section view). One side of the substrate 50 is bonded to the annular flange 30 by a portion of the first adhesive layer 45, that is, one surface of the substrate 50 is bonded to the first adhesive surface 46 of the first adhesive layer 45.

In order to completely and uniformly diverge the light emitted by the light source 40, the backlight module 20 has a reflecting plate 55 and a light guiding plate 60 which are superposed on each other. The reflecting plate 55 has a reflecting plate first side edge 56 and a reflecting plate second side edge 57 opposite to each other. The first side edge 56 of the reflector is attached to the first adhesive surface 46 of the other portion of the first adhesive layer 45. That is, the first adhesive surface 46 of the first adhesive layer 45 simultaneously adheres to the first side edge 56 of the plate and the substrate 50. The second side edge 57 of the reflector rests against the annular flange 30 (or the inner surface of the bottom surface) on the first side 26 of the metal frame 25 and adjacent to the light source 40. It should be noted that the second side edge 57 of the reflector only rests on the annular flange 30, and the second side edge 57 of the reflector does not conform to the flange 30. Preferably, there is a gap (not shown) between the first side edge 56 of the reflector and the substrate 50, so that there can be a work gap when the reflector 55 is adhered. Of course, there is no gap, but when the reflector 55 is attached, the process should be controlled properly.

The material of the light guide plate 60 may be acrylic, polyester, polycarbonate, polystyrene, other suitable transparent materials, or a combination thereof. The light guide plate 60 is disposed on the reflective plate 55, and the light guide plate 60 has a light guide plate first surface 61 and a light guide plate second surface 62 opposite to each other. The first surface 61 of the light guide plate is adjacent to the reflection plate 60, and the second surface 62 of the light guide plate is away from the reflection plate 60. Further, the light guide plate 60 also has a first side edge 63 and a second side edge 64 that are opposite to each other. As shown in FIG. 2, the thickness of the reflecting plate 55 is greater than the thickness of the substrate 50, so that when the light guiding plate 60 abuts against the reflecting plate 55, the reflecting plate 55 is not adhered to the first adhesive layer 45. The surface and the surface of the substrate 55 that is not adhered to the first adhesive layer 45 are substantially uneven (in the cross-sectional view). Therefore, in order to fix the light guide plate 60, a double-sided tape or an adhesive is required to The substrate 50 is bonded. Therefore, the second surface 62 of the light guide plate is substantially flat. In addition, the second side edge 64 of the light guide plate is located on the first side 26 of the metal frame 25 and adjacent to the light source 40, and the first side 61 of the light guide plate of the second side edge 64 of the light guide plate and the first side 26 of the metal frame 25 Does not have an adhesive layer.

Based on the above configuration, when part of the light emitted from the light source 40 positioned on the side of the backlight module 20 is incident on the reflecting plate 55, the light is reflected by the reflecting plate 55. Thereafter, the reflected light is incident on the light guide plate 60 from the first surface 61 of the light guide plate. Then, the light incident on the light guide plate 60 is refracted and reflected in the light guide plate 60, and then emitted from the second surface 62 of the light guide plate of the light guide plate 60 to the outside of the light guide plate 60.

The backlight module 20 may further include a plurality of optical films 65 disposed on the light guide plate 60 for enhancing the brightness, contrast, or other optical properties that the backlight module 20 can provide. These optical films 65 can improve the utilization efficiency of the light of the light source 40 by different characteristics. For example, a portion of the optical film 65 is used to converge the light in the direction of the viewer, thereby increasing the front luminance emitted by the backlight module 20, and a portion of the optical film 65 is used to emit the light from the light guide plate 60. The light is converted into a linear polarized light to effectively improve the efficiency of light utilization.

In addition, in order to more firmly fix the optical film 65 and the entire backlight module 20, the backlight module 20 may further include a fixing frame 70. The fixing frame 70 is disposed on the annular flange (or the inner surface of the bottom surface) 30 and is located at an inner surface of the metal frame 25 (or the inner surface of the side surface of the metal frame 25) 35 and the light guide plate 60 and Between the optical film 65 and other components. The fixing frame 70 has a protruding portion 75, and the protruding portion 75 protrudes from an inner surface of the fixing frame 70. Preferably, the angle formed by the projection 75 and the inner surface of the fixing frame 70 is about ninety degrees, but is not limited thereto. In addition, it should be noted that the fixing frame 70 is an opening in the middle, and the periphery of the opening is surrounded by a solid material, and the opening is about the size of the light guide plate 60.

The projection 75 has an opposite first side 76 and a second side 77 of the projection. The surface of the first side 76 of the projection abuts against the optical film 65 to fix the relative position of the optical film 65 and the light guide plate 60 with respect to the metal frame 25. Preferably, the height of the projections 75 is approximately equal to the sum of the thicknesses of the first adhesive layer 45, the reflective plate 55, the light guide plate 60, and the desired plurality of optical films, but is not limited thereto. In the embodiment, if the height of the protrusion 75 is less than the sum of the thicknesses of the first adhesive layer 45, the reflection plate 55, the light guide plate 60, and the desired plurality of optical films 65, the protrusions 75 are There is a buffer layer (not shown) between the uppermost optical film 65 or a buffer layer (not shown) between the lowermost optical film 65 and the light guide plate 60, and the material of the buffer layer has a buffer function. For example, foam, soft polymer film, adhesive layer can be used, it has a fixed function.

FIG. 3 is a top plan view showing another embodiment of the present invention. Figure 4 is a cross-sectional view taken along line 4-4 of Figure 3. Please refer to "3" and "4" at the same time. The same reference numerals are used to refer to similar components. Please refer to the description of the embodiments of "1" and "2". The difference between the two embodiments is that the metal frame 25' of this embodiment has a first side 26', a second side 27' and a third side 28. The second side 27' and the third side 28 are adjacent to the first side 26', and the second side 27' and the third side 28 are opposite sides of the metal frame 25'. The backlight module 20' further includes a second adhesive layer 48, and the second adhesive layer 48 is located on the third side 28 of the metal frame 25'. The second adhesive layer 48 is used to fix the reflective plate 55 and the light guide plate 60 together with the first adhesive layer 45. In more detail, the first side edge 56 of the reflecting plate of the reflecting plate 55 is bonded to the first adhesive layer 45. The second side edge 57 of the reflector of the reflector 55 is attached to the second adhesive layer 48. The backlight module 20' has two substrates 50, and the substrates 50 are respectively attached to the first adhesive layer 45 and the second adhesive layer 48. The first side edge 63 of the light guide plate of the light guide plate 60 and the second side edge 64 of the light guide plate are respectively adhered to the first adhesive layer 45 and the second adhesive layer 48 via the base materials 50. The design specifications and descriptions of the second adhesive layer 48, the other substrate 50, the reflective plate 55, and the light guide plate 60, please refer to the design specifications of the first adhesive layer 45, the substrate 50, the reflective plate 55, and the light guide plate 60. And its description, can be applied. The first side 26' and the first side 26' of this embodiment have no adhesive layer between the reflecting plate 55 and the inner surface of the annular flange (bottom surface) 30. In addition, in this embodiment, a third adhesive layer (not shown) may be disposed on the inner surface of the annular flange 30 on a fourth side (ie, relative to the first side 26') for added fixation. ).

Fig. 5 is a schematic view showing an optoelectronic device according to an embodiment of the present invention. FIG. 6 is a cross-sectional view showing the combination of the backlight module 20 and the display panel 85 of FIG. 5. In addition to the above-described backlight module, the backlight module 20 can be connected to a display panel 85 and an electronic device 86 in accordance with an embodiment of the present invention. To form a photovoltaic device 80. The electronic device 86 is electrically connected to the backlight module 20 . The display panel 85 may be a non-self-luminous display panel, a self-luminous display panel, or a hybrid display panel (also referred to as a semi-self-luminous display). Specifically, the non-self-luminous display panel, for example, a transmissive display panel, a transflective display panel, a reflective display panel, a color filter on a display panel of a color filter on array, and an active layer Display panel for color on color filter, vertical alignment type (VA) display panel, horizontal switching type (IPS) display panel, multi-domain vertical alignment type (MVA) display panel, twisted nematic type ( TN) display panel, super twisted nematic (STN) display panel, pattern vertical alignment type (PVA) display panel, super pattern vertical alignment type (S-PVA) display panel, advanced large viewing angle (ASV) display panel, edge Electric field switching type (FFS) display panel, continuous flame-like arrangement type (CPA) display panel, axisymmetric array microcell type (ASM) display panel, optical compensation curved alignment type (OCB) display panel, super horizontal switching type (S- IPS) display panel, advanced super horizontal switching type (AS-IPS) display panel, extreme edge electric field switching type (UFFS) display panel, polymer stable alignment display panel, dual-view display panel, three viewing angles Type-trip A display panel, a three-dimensional display panel, an electrophoretic display panel, a blue phase display panel or other type of panel, or a combination thereof. a self-luminous display panel, such as a phosphorescent photoelectric excitation light display panel, a fluorescent photoelectric excitation light display panel, or a combination thereof, and the electroluminescent material may be an organic material, an organic material, an inorganic material, or a combination thereof, and then The molecular size of the above materials includes small molecules, macromolecules, or a combination thereof. The electronic device includes, for example, a control element, an operating element, a processing element, an input element, a memory element, a driving element, a light emitting element, a protection element, a sensing element, a detecting element, or other functional element, or a combination thereof. The type of optoelectronic device 80 includes portable products (such as mobile phones, cameras, cameras, notebook computers, game consoles, watches, music players, e-mail transceivers, map navigators, digital photos, or the like), Audio and video products (such as video projectors or similar products), screens, TVs, billboards, panels in projectors, etc.

Based on the above, since the above embodiment is to fix the reflector to the first adhesive layer, and to fix the light guide plate to the first adhesive layer via the substrate, the steps in the assembly can be reduced in the above embodiment. Complexity to improve assembly efficiency and save assembly labor costs.

In addition, when the first adhesive layer and the light source are respectively located on opposite sides of the metal frame, since one side of the reflective plate and the light guide plate is fixed to the second side of the metal frame, the other side of the same is The first side of the metal frame is such that when the reflecting plate and the light guiding plate are thermally expanded, the reflecting plate and the light guiding plate are extended in the same direction. Therefore, such a design can reduce the friction between the reflector and the light guide.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The patent protection scope of the invention is subject to the definition of the scope of the patent application attached to the specification.

20. . . Backlight module

20’. . . Backlight module

25. . . Metal frame

25’. . . Metal frame

26. . . First side

26’. . . First side

27. . . Second test

27’. . . Second test

28. . . Third side

30. . . Annular flange

35. . . The inner surface

40. . . light source

45. . . First adhesive layer

46. . . First adhesive surface

47. . . Second adhesive surface

48. . . Second adhesive layer

50. . . Substrate

55. . . Reflective plate

56. . . First side edge of the reflector

57. . . Second side edge of the reflector

60. . . Light guide

61. . . First side of the light guide

62. . . Second side of the light guide

63. . . First side edge of the light guide plate

64. . . Second side edge of the light guide plate

65. . . Optical diaphragm

70. . . Fixed frame

75. . . Protrusion

76. . . First side of the projection

77. . . Second side of the projection

80. . . Photoelectric device

85. . . Display panel

86. . . Electronic device

1 is a top plan view of a backlight module according to an embodiment of the invention;

Figure 2 is a schematic cross-sectional view of Figure 1;

Figure 3 is a top plan view showing another embodiment of the present invention;

Figure 4 is a schematic cross-sectional view of Figure 3;

Figure 5 is a schematic view showing an optoelectronic device according to an embodiment of the present invention;

Figure 6 is a cross-sectional view showing the combination of the backlight module and the display panel of Figure 5.

25. . . Metal frame

26. . . First side

27. . . Second side

30. . . Annular flange

35. . . The inner surface

40. . . light source

45. . . First adhesive layer

46. . . First adhesive surface

47. . . Second adhesive surface

50. . . Substrate

55. . . Reflective plate

56. . . First side edge of the reflector

57. . . Second side edge of the reflector

60. . . Light guide

61. . . First side of the light guide

62. . . Second side of the light guide

63. . . First side edge of the light guide plate

64. . . Second side edge of the light guide plate

65. . . Optical diaphragm

70. . . Fixed frame

75. . . Protrusion

76. . . First side of the projection

77. . . Second side of the projection

80. . . Photoelectric device

85. . . Display panel

Claims (6)

A backlight module includes: a metal frame having an annular flange protruding from an inner surface of the metal frame; a light source located on the annular flange and located One side of the metal frame; a first adhesive layer adhered to the annular flange and located on the other side of the metal frame; a substrate is bonded to the first adhesive layer; and a reflective plate is disposed on A side edge of the reflector is attached to the first adhesive layer, and a light guide plate is disposed on the reflector, and a side edge of the light guide plate is adhered to the substrate. The backlight module of claim 1, wherein the light source and the first adhesive layer are located on opposite sides of the metal frame, and the other side edge of the reflective plate extends toward the first side and is opposite to the ring The flange is movably disposed against the annular flange, and the light guide plate abuts against the reflector in a movable manner relative to the reflector. The backlight module of claim 1, further comprising a second adhesive layer, the first adhesive layer and the second adhesive layer are located on opposite sides of the metal frame, and the other side edge of the reflective plate is adhered to the ring The flange is attached to the second adhesive layer. The backlight module of claim 1, further comprising a plurality of optical films disposed on the light guide plate. The backlight module of claim 4, further comprising a fixing frame disposed on the annular flange, the fixing frame having a protruding portion protruding from an inner surface of the fixing frame, the protruding portion The protrusions abut on the optical films to fix the relative positions of the optical films and the light guide plate. An optoelectronic device of a backlight module according to claim 1, comprising: the backlight module; and a display panel disposed on the backlight module.