TWI728821B - Backlight module and display - Google Patents

Abstract

A backlight module including a light guide board, a light source, an adhesive structure and a frame is provided. The light guide board includes a light incident side and a bottom surface. The light source is disposed on the light incident side. The adhesive structure is disposed on a first area of the bottom surface located away from the light incident side, and the adhesive structure is stacked by a first material layer and a second material layer. The frame includes a carrier surface. The light guide board is located on the carrier surface. The adhesive structure connects the light guide board to the frame. An elasticity of the second material layer is larger than an elasticity of the first material layer. A display is also provided.

Description

Backlight module and display device

The present invention relates to an optical element and electronic equipment, in particular to a backlight module and a display device.

Among the existing flat display devices, liquid crystal display devices are still widely used in people's lives and work. The liquid crystal panel in the liquid crystal display device requires an additional backlight to form an image. Therefore, the uniformity, lifetime, and brightness of the backlight will directly affect the picture quality provided by the liquid crystal display device.

The existing backlight module can include a light guide plate, a light source, and a frame, and the connection between the light guide plate and the frame can be connected through a double-sided connection layer with double-sided tape. The existing connection layer includes a connection layer formed of polyethylene terephthalate (PET). However, after long-term use, the connecting layer formed by PET will age and deform, causing the light guide plate to which it is connected to shift, which in turn changes the distance between the light source and the light guide plate and affects the brightness and uniformity of the backlight. Therefore, how to provide a backlight module with high stability without affecting the difficulty of assembly is still one of the main problems to be solved by those skilled in the art.

The invention provides a backlight module and a display device, which have high stability and service life.

An embodiment of the present invention provides a backlight module, which includes a light guide plate, a light source, an adhesive structure, and a frame. The light guide plate includes a light incident side and a bottom surface. The light source is arranged on the light incident side. The sticking structure is disposed in a first area on the bottom surface away from the light incident side. The sticking structure is formed by stacking a first material layer and a second material layer. The elasticity of the second material layer is greater than the elasticity of the first material layer. The frame includes a bearing surface. The light guide plate is located on the bearing surface. The sticking structure connects the light guide plate to the frame.

An embodiment of the present invention provides a display device, which includes a display panel and the aforementioned backlight module, and the display panel is disposed on the backlight module. The light guide plate includes a light emitting surface, which faces the display panel. The bottom surface is opposite to the light-emitting surface, and the light-incident side is connected to the light-emitting surface and the bottom surface.

It can be seen from the above that the light guide plate in the backlight module of the embodiment of the present invention is connected to the frame by the sticking structure, and the sticking structure is formed by stacking the first material layer and the second material layer, so the guide can be maintained on the frame for a long time. The light board is in place. The display device of the embodiment of the present invention can provide a good picture for a long time, and prevent the aging of the light guide plate from affecting the picture of the display device.

The embodiments of the present invention provide a backlight module, which can be applied to a display device. The embodiments of the present invention provide a display device, which can be applied to a computer screen, a smart phone, a tablet computer, or a TV screen, and the present invention is not limited to this.

In the drawings, the thickness of layers, films, panels or regions, etc., are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, film, panel or region is referred to as being "on" or "connected" to another element, it can be directly on or connected to the other element, or Intermediate elements can also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connection" can refer to a physical or electrical connection. Furthermore, "electrical connection" or "coupling" can mean that there are other elements between the two elements.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. Therefore, the “first element” discussed below can also be referred to as the “second element” without departing from the teaching of this text.

Figure 1 is a three-dimensional exploded schematic view of the display device in an embodiment of the present invention. Referring to FIG. 1, in this embodiment, the display device 10 includes a backlight module 100 and a display panel 200, and the display panel 200 is disposed on the backlight module 100.

The backlight module 100 includes a light guide plate 110, a plurality of light sources 120 and a frame 130. The light guide plate 110 includes a light entrance side 111 and a light exit surface 112 connected to the light entrance side 111, and the light exit surface 112 faces the display panel 120.

The light sources 120 are arranged on the light incident side 111, and the light provided by the light sources 120 can be transmitted as the illuminating light L1 through the light guide plate 110. The illuminating light L1 can be emitted from the light-emitting surface 112 and transmitted to the display panel 200 to form an image on the display surface 201 of the display panel 200.

Figure 2 is a schematic plan view of a backlight module in an embodiment of the present invention. Please refer to FIG. 2, the backlight module 100 further includes an adhesive structure 140.

The frame 130 includes a bearing surface 131. The light guide plate 110 is located on the bearing surface 131 of the frame 130. The sticking structure 140 connects the light guide plate 110 to the frame 130.

In detail, the backlight module 100 may further include a flexible circuit board 121 which is electrically connected to the light sources 120. The flexible circuit board 121 is used to transmit driving signals to the light sources 120, but the invention is not limited to this. In some embodiments, each of the light sources 120 can be connected to a conductive wire or a circuit board to transmit driving signals to light up the light sources 120. In other embodiments, the light sources 120 may be provided by a light-emitting strip, and the present invention is not limited to this.

Fig. 3 is a schematic cross-sectional view drawn according to the cutting line 3-3 in Fig. 2. Referring to FIG. 3, the light guide plate 110 further includes a bottom surface 113, and the bottom surface 113 is opposite to the light emitting surface 112, and the light incident side 111 is connected to the light emitting surface 112 and the bottom surface 113.

The adhesive structure 140 is disposed on the bottom surface 113 away from the light incident side 111 in the first region A, and the adhesive structure 140 is formed by stacking the first material layer 141 and the second material layer 142, and the second material layer 142 is more elastic than the first material The elasticity of layer 141.

FIG. 4 is another schematic cross-sectional view of the backlight module in an embodiment of the present invention. Since the light guide plate 110 of this embodiment is adhered to the supporting surface 131 of the frame 130 by the adhesive structure 140, and the adhesive structure 140 includes a first material layer 141 and a second material layer 142. Therefore, for example, referring to Figure 4, when the light guide plate 110 is bent in the first direction d1 due to long-term use, the second material layer 142 with greater elasticity can withstand the bending of the light guide plate 110 due to deformation , And the first material layer 141 can be prevented from being affected by the curved light guide plate 110, so that the adhesive structure 140 can be maintained at the same position on the carrying surface 131.

Furthermore, the toughness of the first material layer 141 is higher than that of the second material layer 142. When the backlight module 100 needs to be reworked, the adhesive structure 140 with the first material layer 141 can be easily removed from the supporting surface 131.

For example, referring to FIGS. 3 and 4, the adhesive structure 140 of this embodiment further includes a first adhesive layer 143 attached to the first material layer 141 and a first adhesive layer 143 attached to the second material layer 142 The second adhesive layer 144, and the first adhesive layer 143, the first material layer 141, the second material layer 142, and the second adhesive layer 144 are sequentially stacked along one direction.

For example, the second material layer 142 may include silicone rubber. Before the second material layer 142 and the second adhesive layer 144 are combined, the second material layer 142 can be coated with a silicone treatment agent on the surface, so that the second adhesive layer 144 can be properly formed on the second material layer by the pretreatment step 142 on the surface.

When the light guide plate 110 is used for a long time or is deformed in a high temperature environment, the second material layer 142 can also change its shape so that the second adhesive layer 144 will not peel off from the bottom surface 113 of the light guide plate 110 or the second material layer 142. In the case of the heavy industry backlight module 100, because the first material layer 141 with higher toughness is bonded to the first adhesive layer 143 with a surface with higher hardness, the adhesive structure 140 can be easily removed from the supporting surface 131 and is not easily removed. The phenomenon of residual glue. In other words, the adhesive structure 140 of this embodiment allows the backlight module 100 to maintain proper brightness after long-term use, and at the same time, it also allows the backlight module 100 to be easily reworked.

Furthermore, referring to FIG. 3, in this embodiment, the distance g1 between the first material layer 141 and the supporting surface 131 is smaller than the distance g2 between the second material layer 142 and the supporting surface 131. In other words, in the adhesive structure 140, the first material layer 141 and the second material layer 142 are stacked along the first direction d1, and the first material layer 141 is located between the second material layer 142 and the carrying surface 131, and the second material layer 141 The material layer 142 is located between the light guide plate 110 and the first material layer 141, and the first direction d1 is parallel to the normal direction of the bearing surface 131.

The first material layer 141 is adjacent to the supporting surface 131 of the frame 130, and the first material layer 141 can maintain the first adhesive layer 143 in a proper position on the supporting surface 131.

The second material layer 142 is adjacent to the light guide plate 110, so the second material layer 142 can change the shape of the light guide plate 110 so that the second adhesive layer 144 will not peel off.

For example, the material of the first material layer 141 may include PET, and the material of the second material layer 142 may include silicone rubber. Before the second material layer 142 and the first material layer 141 are stacked on each other, the surface of the first material layer 141 may be coated with a treatment agent, and then the first material layer 141 and the second material layer 142 are combined by calendering. In other embodiments of the present invention, the material of the first material layer 141 may also include polycarbonate (PC), and the material of the second material layer 142 may include rubber or other elastic plastics.

Therefore, the adhesive structure 140 of this embodiment may be formed by stacking the first material layer 141 and the second material layer 142 in a flush manner, so that the second material layer 142 can provide sufficient cushioning effect in the adhesive structure 140 . For example, the thickness of the first material layer 141 and the second material layer 142 may fall within a range of 0.1 mm to 0.15 mm.

Furthermore, the thickness of the second material layer 142 is greater than the thickness of the first material layer 141. Fig. 5 is a partial enlarged view of area C in Fig. 3. Referring to FIG. 5, the first material layer 141 has a third thickness h3, the second material layer 142 has a fourth thickness h4, and the fourth thickness h4 is greater than the third thickness h3. Therefore, the second material layer 142 with higher elasticity can provide sufficient cushioning effect and can change the shape of the light guide plate 110.

For example, in this embodiment, the ratio of the third thickness h3 to the fourth thickness h4 is less than or equal to one third, which may have a better optical effect.

Please refer to FIG. 3, in this embodiment, the backlight module 100 further includes a reflective element 150. The reflective element 150 is disposed on the carrying surface 131, and the reflective element 150 corresponds to the second area B of the bottom surface 113 of the light guide plate 110 adjacent to the light incident side 111, and the second area B is located between the light incident side 111 and the first area A. In detail, the light incident side 111, the second area B, and the first area A of this embodiment are sequentially arranged along the second direction d2, and the first direction d1 is perpendicular to the second direction.

On the other hand, the adhesive structure 140 of this embodiment has a first thickness h1, the reflective element 150 has a second thickness h2, and the first thickness h1 is greater than the second thickness h2. Specifically, the light source 120 is electrically connected to the flexible circuit board 121, and the flexible circuit board 121 can be further electrically connected to the adapter circuit board 122 to be electrically connected to the control circuit board 123. The adhesive structure 140 of this embodiment connects the first area A of the bottom surface 113 to the carrying surface 131 so that the light guide plate 110 can be fixed in the frame 130.

Furthermore, on the carrying surface 131 of the frame 130 of this embodiment, the distribution area of the light source 120 and the distribution area of the adhesive structure 140 are located on both sides of the distribution area of the light guide plate 110, and the adhesive structure 140 is distributed on the carrying surface 131 The area exceeds the division of the light guide plate 110 on the bearing surface 131 Cloth area. Therefore, the pasting structure 140 can further connect other components in the backlight module 100 to the supporting surface 131.

FIG. 6 is a schematic cross-sectional view of a backlight module according to another embodiment of the invention. The backlight module 100A of this embodiment is similar to the backlight module 100 of the above-mentioned embodiment, and similar components will not be repeated here. The backlight module 100A includes a light guide plate 110, a light source 120, a frame 130, an adhesive structure 140, and a reflective element 150, and the adhesive structure 140 includes a first material layer 141, a second material layer 142, a first adhesive layer 143, and a second adhesive layer.胶层144。 胶层144.

In this embodiment, the distribution area of the adhesive structure 140 on the carrying surface 131 exceeds the distribution area of the light guide plate 110 on the carrying surface 131. The backlight module 100A further includes a plastic frame 160, and the plastic frame 160 surrounds the light guide plate 110, so the adhesive structure 140 can also connect the plastic frame 160 to the frame 130.

The backlight module of the embodiment of the present invention is not limited to the stacking manner of the first material layer 141 and the second material layer 142 in the foregoing embodiment. FIG. 7 is a schematic cross-sectional view of a backlight module according to still another embodiment of the present invention. Please refer to FIG. 7, the backlight module 100B of this embodiment is similar to the backlight module 100 of the above-mentioned embodiment, and similar components will not be repeated here. The backlight module 100B includes a light guide plate 110, a light source 120, a frame 130, an adhesive structure 140, and a reflective element 150, and the adhesive structure 140 includes a first material layer 141, a second material layer 142, a first adhesive layer 143, and a second adhesive layer.胶层144。 胶层144.

In this embodiment, the distance g3 between the first material layer 141 and the bearing surface 131 is greater than the distance g4 between the second material layer 142 and the bearing surface 131. In other words, the first material layer 141 is adjacent to the light guide plate 110, so the first material layer 141 can make the first adhesive layer 143 on the light guide plate 110 Maintained in place.

The second material layer 142 is adjacent to the supporting surface 131 of the frame 130, so the second material layer 142 can change the shape of the light guide plate 110 to prevent the second adhesive layer 144 from peeling off the supporting surface 131.

FIG. 8 is a schematic cross-sectional view of a backlight module according to still another embodiment of the present invention. Please refer to FIG. 8, the backlight module 100C of this embodiment is similar to the backlight module 100 of the above-mentioned embodiment, and similar components will not be repeated here. The backlight module 100C includes a light guide plate 110, a light source 120, a frame 130 and an adhesive structure 140, and the adhesive structure 140 includes a first material layer 141, a second material layer 142, a first adhesive layer 143 and a second adhesive layer 144.

In this embodiment, the bearing surface 131 of the frame 130 of the backlight module 100C is a reflective surface.

In detail, the frame 130 may include a reflective film 132, and the carrying surface 131 is formed on the reflective film 132. The adhesive structure 140 connects the first area A of the bottom surface 113 to the bearing surface 131 provided by the reflective film 132. Therefore, the light guide plate 110 can be fixed to the frame 130 by the adhesive structure 140, and the light guide plate 110 can be maintained in a proper position.

On the other hand, an edge of the adhesive structure 140 of the backlight module 100C and the edge of the light guide plate 110 away from the light incident side 111 are arranged flush. Therefore, the sticking structure 140 can fix the light guide plate 110 on the frame 130, and can also reduce the frame area of the backlight module 100C, thereby providing a proper backlight for the narrow frame display device.

In summary, the backlight module of the embodiment of the present invention includes an adhesive structure, which can connect the light guide plate to the frame, and the adhesive structure can be achieved by the second material layer. In order to prevent the adhesive structure from being peeled off due to the deformation of the light guide plate, the first material layer can fix the adhesive structure on the frame, and at the same time, can avoid residual glue during heavy work. The display device of the embodiment of the present invention can provide a good picture for a long time, and can also prevent the aging of the light guide plate from affecting the picture of the display device.

A: The first area

B: second area

C: area

d1: first direction

d2: second direction

g1: distance

g2: distance

g3: distance

g4: distance

h1: first thickness

h2: second thickness

h3: third thickness

h4: fourth thickness

3-3: Cutting line

10: Display device

100: Backlight module

100A: Backlight module

100B: Backlight module

100C: Backlight module

110: Light guide plate

111: light incident side

112: Glossy Surface

113: Bottom

120: light source

121: flexible circuit board

122: transfer circuit board

123: control circuit board

130: Frame

131: bearing surface

132: reflective film

140: Paste structure

141: The first material layer

142: second material layer

143: The first adhesive layer

144: second adhesive layer

150: reflective element

160: plastic frame

200: display panel

201: display surface

Figure 1 is a three-dimensional exploded schematic diagram of a display device in an embodiment of the present invention; Figure 2 is a schematic plan view of a backlight module in an embodiment of the present invention; Figure 3 is a schematic cross-sectional view drawn according to the cutting line 3-3 in Figure 2; FIG. 4 is another schematic cross-sectional view of the backlight module in an embodiment of the present invention; Figure 5 is a partial enlarged view of area C in Figure 3; 6 is a schematic cross-sectional view of a backlight module according to another embodiment of the present invention; FIG. 7 is a schematic cross-sectional view of a backlight module according to still another embodiment of the present invention; FIG. 8 is a schematic cross-sectional view of a backlight module according to still another embodiment of the present invention.

Domestic deposit information (please note in the order of deposit institution, date and number) no Foreign hosting information (please note in the order of hosting country, institution, date, and number) no

A: The first area

B: second area

C: area

d1: first direction

d2: second direction

g1: distance

g2: distance

h1: first thickness

h2: second thickness

100: Backlight module

110: Light guide plate

111: light incident side

112: Glossy Surface

113: Bottom

120: light source

121: flexible circuit board

122: transfer circuit board

123: control circuit board

130: Frame

131: bearing surface

140: Paste structure

141: The first material layer

142: second material layer

143: The first adhesive layer

144: second adhesive layer

150: reflective element

Claims (12)

A backlight module includes: a light guide plate, including a light-incident side and a bottom surface; a light source, arranged on the light-incident side; an adhesive structure, arranged on the bottom surface away from the first light-incident side Area, and the adhesive structure is formed by stacking a first material layer and a second material layer, wherein the elasticity of the second material layer is greater than that of the first material layer, and the first material layer and The distance between the bearing surfaces is smaller than the distance between the second material layer and the bearing surface; and a frame including a bearing surface, the light guide plate is located on the bearing surface, and the adhesive structure Connect the light guide plate to the frame. The backlight module according to claim 1, further comprising: a reflective element disposed on the carrying surface, and the reflective element corresponds to a second area on the bottom surface adjacent to the light incident side, and The second area is located between the light incident side and the first area. The backlight module according to claim 2, wherein the pasting structure has a first thickness, the reflective element has a second thickness, and the first thickness is greater than the second thickness. According to the backlight module of claim 1, the adhesive structure is stuck on the bearing surface. According to the backlight module of claim 1, the bearing surface of the frame is a reflective surface. The backlight module according to claim 1, wherein the first material layer has a third thickness, the second material layer has a fourth thickness, and the fourth thickness is greater than the third thickness. The backlight module according to claim 6, wherein the ratio of the third thickness to the fourth thickness is less than or equal to one third. According to the backlight module of claim 1, the adhesive structure includes: a first adhesive layer connecting the second material layer to the bottom surface of the light guide plate; and a second adhesive layer connecting The first material layer and the bearing surface of the frame. The backlight module according to claim 1, wherein the adhesive structure is formed by stacking the first material layer and the second material layer in a flush manner. The backlight module according to claim 1, wherein an edge of the adhesive structure and an edge of the light guide plate away from the light incident side are arranged flush. The backlight module according to claim 1, wherein the distribution area of the adhesive structure on the carrying surface exceeds the distribution area of the light guide plate on the carrying surface. A display device, comprising: a display panel; and the backlight module according to any one of claims 1 to 11, the display panel is arranged on the backlight module, and the light guide plate includes a light-emitting surface, It faces the display panel, the bottom surface is opposite to the light emitting surface, and the light incident side is connected to the light emitting surface and the bottom surface.

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