TWI780937B - Backlight Modules and Displays - Google Patents

Abstract

The backlight module of the present invention includes a first frame, a light guide plate, a light-emitting unit, a reflection sheet and at least one limiting member. The light guide plate is supported on the first frame and receives the light emitted by the light-emitting unit. The reflection sheet has A plane part and at least one bending part arranged on the plane part, the plane part is arranged between the first frame and the light guide plate, the stopper is arranged adjacent to the edge of the light guide plate and forms a gap with the light guide plate, and the bending part of the bending part is placed in the gap, and part of the bending part can abut against the limiter to form an included angle with the edge of the light guide plate. The present invention uses the limiter to limit the bending part so that the included angle is maintained within a preset range Therefore, the bending part can effectively reflect light, and if the light guide plate and the reflection sheet expand and contract, the design of the transmission gap can prevent the bending part from being squeezed and deformed.

Description

Backlight module and display

The invention relates to a backlight module, in particular to a backlight module including a limiting member to limit the bending portion of a reflection sheet, and a display including the backlight module.

Today's edge-lit backlight modules usually include a backplane, a light-emitting element disposed on the edge of the backplane, and a light guide plate. The light guide plate is disposed on the backplane and has a light-emitting surface. When the light plate emits light, the light guide plate will conduct light so that the light is emitted from the light emitting surface, and in order to improve the utilization rate of light, the light guide plate is provided with a reflective sheet on the other side of the light emitting surface, so The edge of the reflective sheet has a bent portion, and the bent portion is attached to the side edge of the light guide plate to reflect light.

The bending part is usually directly attached to the light guide plate without glue, or attached to the light guide plate by optical glue, but after a period of time, the viscosity of the optical glue It will be weakened due to the change of chemical composition. At this time, the bending part will be affected by the residual stress, and will peel off from the side edge of the light guide plate, and form an angle with the side edge of the light guide plate, and the The included angle will gradually increase with the residual stress, so that the bent portion of the reflection sheet cannot effectively reflect light, resulting in a decrease in the light utilization efficiency of the edge-lit backlight module, so there is still room for improvement.

The main purpose of the present invention is to provide a backlight module, hoping to improve the problem that the bending part of the current reflection sheet cannot effectively reflect light when it cannot be flattened to the side edge of the light guide plate or the adhesion is weakened and peeled off. .

In order to achieve the purpose disclosed above, the backlight module of the present invention includes: a first frame having a bottom frame portion; a light guide plate supported on the bottom frame portion of the first frame; a light emitting unit, the light guide plate receives the light emitted by the light emitting unit; A reflective sheet, which has a flat portion and at least one bent portion, the flat portion is disposed between the bottom frame portion and the light guide plate, and the bent portion is disposed on the flat portion; and At least one limiting member is arranged adjacent to the edge of the light guide plate, and a gap is formed between the limiting member and the light guide plate, and the bending portion is extended in the gap, and part of the The bent portion can abut against the limiting member and form an included angle with the edge of the light guide plate.

In order to achieve the purpose disclosed above, the present invention further provides a display, which includes: A backlight module as above; and A display panel is located on the other side of the light guide plate relative to the reflection sheet.

The bending portion of the reflection sheet of the backlight module of the present invention is located between the edge of the light guide plate and the limiting member. When the light-emitting unit projects light on the light guide plate, the reflection sheet can reflect the light, and the bending part is against the stopper, so the angle between the bending part and the edge of the light guide plate can be maintained in a preset range, so that the bending part can effectively reflect light, and in addition, if the light guide plate and the reflective sheet expand and contract due to temperature, the bending can be avoided due to the gap formed between the limiting member and the light guide plate part is squeezed and deformed by the light guide plate and the limiting member, so as to maintain the light reflection effect of the bending part, and effectively avoid the reduction of the light utilization rate of the backlight module and the display.

Please refer to FIG. 1 to FIG. 5 , which are various preferred embodiments of the backlight module of the present invention, which include a first frame 10 , a light guide plate 20 , a light emitting unit 30 , a reflective sheet 40 and at least one stopper 50 .

As shown in FIGS. 1 to 5 , the first frame 10 has a bottom frame portion 11 , the light guide plate 20 is placed on the bottom frame portion 11 of the first frame 10 , and the light guide plate 20 receives the light emitting unit 30 For the emitted light, the reflective sheet 40 has a flat portion 41 and at least one bent portion 42, the flat portion 41 is disposed between the bottom frame portion 11 and the light guide plate 20, and the bent portion 42 is disposed on the Planar portion 41, the reflective sheet 40 can reflect light, and in addition, according to the design of the product used in the backlight module, the reflective sheet 40 can have a plurality of the bending portions 42, and the plurality of bending portions 42 are along the plane A plurality of edges of the portion 41 surround the planar portion 41 to provide a better light leakage prevention effect.

As shown in FIGS. 2 to 5 , the limiting member 50 is adjacent to the edge of the light guide plate 20 , and a gap is formed between the limiting member 50 and the light guide plate 20 , and the bending portion 42 is Stretching in the gap, part of the bending portion 42 can abut against the limiting member 50 and form an angle θ with the edge of the light guide plate 20, by abutting against the limiting member In the design of 50, the angle of the included angle θ can be maintained within a preset range, so that the bending portion 42 can effectively reflect light and avoid light leakage in the backlight module, wherein the angle of the included angle θ The range is preferably between 10-15 degrees, inclusive, so as to achieve a better reflection effect.

In addition, when assembling the backlight module, the bending portion 42 can be directly abutted against the limiting member 50 to be limited, or the bending portion 42 can be glued to the guide with glue. For the edge of the light plate 20 , when the adhesiveness of the bent portion 42 is peeled off from the edge of the light guide plate 20 when the adhesiveness is weakened, the bent portion 42 will contact the limiting member 50 .

In addition, if the light guide plate 20 and the reflective sheet 40 expand and contract due to the influence of temperature, and thus push to the bending portion 42 of the reflective sheet 40, due to the limiting member 50 and the light guide plate 20 The gap is formed between them, so that the bending part 42 can move to avoid being deformed by being pressed by the light guide plate 20 and the stopper 50, thereby maintaining the effect of the bending part 42 reflecting light Preferably, the bending portion 42 extends obliquely in a direction away from the light guide plate 20 , the limiting member 50 has an abutment surface 51 for the bending portion 42 to abut against, and the The abutment surface 51 is not parallel to the bending portion 42, so as to avoid surface contact between the bending portion 42 and the abutting surface 51 of the limiting member 50, so that the bending portion 42 has no space to move. situation.

The backlight module of the present invention has multiple types for manufacturers to choose according to the product size or production cost of the backlight module application. In the first preferred embodiment of the backlight module of the present invention, the limit The member 50 is arranged on the bottom frame portion 11 of the first frame 10. As shown in FIG. Abut against the abutting surface 51 of the abutting end 53, and the width of the connecting end 52 is equal to the width of the abutting end 53, which can facilitate manufacturing and reduce production costs; as shown in Figure 2, the connecting end 52 The width is preferably greater than the width of the abutting end 53 , so as to effectively improve the structural strength of the limiting member 50 .

As shown in Figure 3, in the second preferred embodiment of the present invention, the first frame 10 can also have at least one frame portion 12, the frame portion 12 is arranged on the bottom frame portion 11, and the position limiting The member 50 is arranged on the frame portion 12 of the first frame 10 and extends toward the light guide plate 20, and the abutment surface 51 is not parallel to the bending portion 42, so as to prevent the bending portion 42 from being in contact with the limiter. The abutting surface 51 of the position member 50 is in surface contact.

As shown in Figure 4 and Figure 5, in the third preferred embodiment of the backlight module of the present invention, the backlight module can include a second frame 60, the second frame 60 has a top 61 and at least one side part 62, the light guide plate 20 is located between the top 61 and the bottom frame part 11, the side part 62 is set on the periphery of the frame part 12 of the first frame 10, and the stopper 50 is set on the second The top 61 of the second frame 60 is capable of abutting against the bent portion 42 , and the abutment surface 51 is not parallel to the bent portion 42 , so as to prevent the bent portion 42 from colliding with the limiting member 50 The abutting surface 51 is in surface contact. In this embodiment, the widths of the connecting end 52 and the abutting end 53 of the limiting member 50 can still be changed according to requirements, and no matter in any of the aforementioned embodiments, the limiting member 50 is The effect of limiting the bending portion 42 of the reflection sheet 40 can be achieved.

In addition, according to the product design of the application of the present invention, the limiting member 50 can extend along the edge of the light guide plate 20 and be elongated to provide a better limiting strength of the bending portion 42, or the The backlight module can include a plurality of said limiters 50, and the plurality of limiters 50 are arranged at intervals along the bending portion 42 of the reflector 40, so that the bending portion 42 is sufficient to reduce the production cost. limit strength.

Furthermore, the limiting member 50 can be fixed on the first frame 10 or the second frame 60 in a detachable fixing manner such as bonding and locking, so that it can be disassembled and replaced during maintenance of the backlight module. It can also be integrally formed with the first frame 10 or the second frame 60 to reduce the assembly time of the backlight module and improve the structural strength of the limiting member 50 .

Please refer to FIG. 6 and FIG. 7, which is a preferred embodiment of the display of the present invention, which includes a backlight module as mentioned above and a display panel 70, the display panel 70 is located at the position of the light guide plate 20 relative to the reflective sheet 40 The other side can also be selected to be arranged on the top 61 of the second frame 60 or directly on the first frame 10 according to the design of the product.

To sum up, even if the bending portion 42 fails to stick flat to the side edge of the light guide plate 20 or peels off due to weakened adhesion, it can be limited by the limiting member 50 so that the folding The included angle θ between the bent portion 42 and the edge of the light guide plate 20 can be maintained within a preset range, so as to avoid an excessive inclination angle of the bent portion 42, so that the bent portion 42 can effectively reflect light , and improve light utilization. In addition, the glue on the bending portion 42 can also be omitted to achieve the technical effect of saving costs. In addition, because the glue is omitted, the reflective sheet 40 can be easily reworked, reducing the man-hours of rework and the reflection. The loss rate of sheet 40. If the light guide plate 20 and the reflection sheet 40 expand and contract due to the influence of temperature, the bending portion 42 can be prevented from being damaged due to the gap formed between the limiting member 50 and the light guide plate 20 . The light guide plate 20 and the limiting member 50 are squeezed and deformed so as to maintain the light reflection effect of the bending portion 42 and effectively prevent the light utilization efficiency of the backlight module and the display from decreasing.

10: First frame 11: Bottom frame 12: frame part 20: Light guide plate 30: Lighting unit 40: reflector 41: Plane 42: Bending part 50: limit piece 51: abutment surface 52: Connecting end 53: abutment end 60: Second frame 61: top 62: side 70: Display panel θ: included angle

Fig. 1 is a schematic cross-sectional front view of the first preferred embodiment of the backlight module of the present invention. FIG. 2 is a schematic partial cross-sectional view of the first preferred embodiment of the backlight module of the present invention, where the connecting end of the limiting member is larger than the abutting end. FIG. 3 is a schematic partial cross-sectional view of the second preferred embodiment of the backlight module of the present invention. FIG. 4 is a schematic partial cross-sectional view of a third preferred embodiment of the backlight module of the present invention. FIG. 5 is a schematic partial cross-sectional view of the third preferred embodiment of the backlight module of the present invention, where the connecting end of the limiting member is larger than the abutting end. Fig. 6: is a front view cross-sectional schematic view of a preferred embodiment of the display of the present invention. FIG. 7 is a schematic partial cross-sectional view of the display of the present invention.

10: First frame

11: Bottom frame

20: Light guide plate

40: reflector

41: Plane

42: Bending part

50: limit piece

51: abutment surface

52: Connecting end

53: abutment end

θ: included angle

Claims (7)

A backlight module, which includes: a first frame, which has a bottom frame portion; a light guide plate, which is supported on the bottom frame portion of the first frame; a light emitting unit, and the light guide plate receives the light emitting unit The emitted light; a reflection sheet, which has a plane part and at least one bending part, the plane part is arranged between the bottom frame part and the light guide plate, and the bending part is arranged on the plane part; and at least A limiter, which is adjacent to the edge of the light guide plate, and a gap is formed between the limiter and the light guide plate, the bending part is extended in the gap, part of the fold The bent portion can lean against the limiter and form an angle with the edge of the light guide plate; wherein the limiter is arranged on the bottom frame of the first frame; wherein the limiter has an opposite A connecting end and an abutting end, the connecting end is arranged on the bottom frame portion of the first frame, part of the bending portion can abut against the abutting end, the width of the connecting end is greater than the width of the abutting end . A backlight module, which includes: a first frame, which has a bottom frame portion; a light guide plate, which is supported on the bottom frame portion of the first frame; a light emitting unit, and the light guide plate receives the light emitting unit The emitted light; a reflection sheet, which has a plane part and at least one bending part, the plane part is arranged between the bottom frame part and the light guide plate, and the bending part is arranged on the plane part; and at least A limiter, which is adjacent to the edge of the light guide plate, and a gap is formed between the limiter and the light guide plate, the bending part is extended in the gap, part of the fold The bent portion can abut against the limiting member and form an included angle with the edge of the light guide plate; Wherein the first frame further has at least one frame portion, the frame portion is arranged on the bottom frame portion, and the limiting member is arranged on the frame portion of the first frame, and extends toward the light guide plate. A backlight module, which includes: a first frame, which has a bottom frame portion; a light guide plate, which is supported on the bottom frame portion of the first frame; a light emitting unit, and the light guide plate receives the light emitting unit The emitted light; a reflection sheet, which has a plane part and at least one bending part, the plane part is arranged between the bottom frame part and the light guide plate, and the bending part is arranged on the plane part; and at least A limiter, which is adjacent to the edge of the light guide plate, and a gap is formed between the limiter and the light guide plate, the bending part is extended in the gap, part of the fold The bent portion can abut against the limiting member and form an included angle with the edge of the light guide plate; wherein the first frame also has at least one frame portion, the frame portion is arranged on the bottom frame portion, and the backlight module The set includes a second frame, the second frame has a top and at least one side, the light guide plate is located between the top and the bottom frame, and the side is provided on the periphery of the frame of the first frame, And the limiting member is arranged on the top of the second frame. The backlight module according to claim 3, wherein the limiting member has an opposite connecting end and an abutting end, the connecting end is arranged on the top of the second frame, and part of the bending portion can be abutted against Leaning against the abutting end, the width of the connecting end is greater than the width of the abutting end. The backlight module according to any one of claims 1 to 4, wherein the backlight module includes a plurality of the limiting members, and the plurality of limiting members are arranged at intervals along the bending portion of the reflective sheet. The backlight module according to any one of claims 1 to 4, wherein the bending portion extends obliquely in a direction away from the light guide plate, and the limiting member has a contact for the bending portion An abutment surface, and the abutment surface is not parallel to the bending portion. A display comprising: A backlight module according to any one of Claims 1 to 6; and a display panel, which is located on the other side of the light guide plate relative to the reflection sheet.

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