TWI526747B - Backlight module with net-like film support - Google Patents

Description

Backlight module with mesh diaphragm support

The present invention relates to a backlight module for a display device; in particular, the present invention relates to a backlight module for a display device and having a mesh diaphragm support design.

In recent years, the technology of liquid crystal display devices has gradually matured. As consumer preferences and demands increase, liquid crystal display devices are becoming thinner. In order to achieve the purpose of thinning, various components of the liquid crystal display device are required to be reduced in thickness, such as a display panel, an optical film, and a backlight module. In the backlight module, since the required light mixing space is required, the required thickness is usually large, and thus it is also the main target for thickness reduction.

Figure 1 shows a thinner direct type backlight module. As shown in FIG. 1A, a plurality of light emitting diode light sources 13 are disposed on the bottom plate 10. Next, a reflective film 30 is provided above the light-emitting diode light source 13. A plurality of through holes 31 are formed in the reflective film 30. The light generated by the light-emitting diode light source 13 is reflected by the back and forth between the reflective film 30 and the bottom plate 100, and is emitted by different through holes 31 to achieve the purpose of light source dispersion. Further, a diffusion plate 50 is additionally provided above the reflective film 30. The diffusion plate 50 and the reflection film 30 are supported by the support members 11 and 12 provided on the bottom plate 10 through the through holes 31. The light leaving the reflective diaphragm 30 passes through the diffuser 50 to produce a uniform backlight.

However, as the display area of the display device increases, the area of the backlight module also increases accordingly. In the backlight module described above, when the area of the reflective film 30 is increased, it is necessary to increase the number of the support members 12 to increase the supporting force and prevent the reflective film 30 from being bent. However, when the number of the support members 12 is increased, the assembly process and cost are inevitably increased. Further, as the number of the support members 12 increases, the number of the perforations 31 also increases, which in turn causes the light leakage due to the perforations 31 to become severe.

It is an object of the present invention to provide a backlight module having better backlight uniformity.

Another object of the present invention is to provide a backlight module having a better diaphragm supporting effect.

The backlight module comprises a carrier board, a plurality of light sources, a first support net and an optical control film. The carrier board has a bearing surface for carrying the light source; in addition, the carrier board further comprises a plurality of winding units disposed around the bearing surface. The first support net may be composed of a single first support line or a plurality of first support lines, and suspended above the light source by the support of the carrier. The first support line passes at least a portion of the winding unit and bypasses the loading surface via the winding unit to change direction. The optical control film is supported by the first support net and disposed above the light source to distribute the light generated by the light source from different positions of the optical control film. In this way, the light generated by the light source can be distributed by adjusting the density and size of the light exiting holes at different positions on the film to change the aperture ratio per unit area at different positions. With the above arrangement, the support effect on the optical control film can be effectively improved, and the situation in which the optical control film is bent or displaced can be reduced.

101‧‧‧ first side

102‧‧‧Second side

103‧‧‧ third side

104‧‧‧ fourth side

110‧‧‧ Carrier Board

111‧‧‧ bearing surface

130‧‧‧Light source

150‧‧‧Winding unit

151‧‧‧Outline winding unit

152‧‧‧Inline winding unit

161‧‧‧First Corner

162‧‧‧Second Corner

181‧‧‧floor

183‧‧‧ side wall

201‧‧‧ first end

202‧‧‧ second end

205‧‧‧ turning section

210‧‧‧First support net

211‧‧‧First support line

220‧‧‧second support net

221‧‧‧second support line

300‧‧‧Optical Control Film

301‧‧‧reflecting surface

310‧‧‧Lighting hole

311‧‧‧ Block

600‧‧‧Diffuser

700‧‧‧First support column

710‧‧‧Cylinder

711‧‧‧ accommodating slot

730‧‧‧Support platform

731‧‧‧Support surface

800‧‧‧second support column

810‧‧‧Cylinder

811‧‧‧ accommodating slot

813‧‧‧ column top

830‧‧‧Support platform

831‧‧‧Support surface

833‧‧‧ wire trough

910‧‧‧First tension adjustment unit

920‧‧‧Second tension adjustment unit

930‧‧‧Base

931‧‧‧First ratchet

950‧‧‧ ratchet

951‧‧‧second ratchet

952‧‧‧ wheel side

953‧‧‧ Groove

955‧‧‧Axis

970‧‧‧ Cover

1 is a schematic view of a thinned backlight module; FIG. 2A is an exploded view of an embodiment of a backlight module of the present invention; FIG. 2B is a schematic view of another embodiment of the winding unit; FIG. 3 is a bearing surface and a first supporting net FIG. 4 is a cross-sectional view showing another embodiment of the bearing surface and the first supporting net; FIG. 5 is a schematic cross-sectional view showing an embodiment of the backlight module; FIG. 6 is a schematic view of an embodiment of the optical regulating film; FIG. 7B is a schematic view of an embodiment of a first support net and a second support net winding; FIG. 7C is a schematic view of another embodiment of the first support net and the second support net winding; 8 is a schematic view of an embodiment of a backlight module including a tension adjusting unit; FIG. 9 is an exploded view of an embodiment of a tension adjusting unit; FIGS. 10A and 10B are schematic views of an embodiment of a first supporting column; FIG. 11A and FIG. A schematic diagram of an embodiment of two support columns.

The present invention provides a backlight module for use in a display device. In a preferred embodiment, the display device uses a liquid crystal display panel to cooperate with the backlight module to generate an image. However, in various embodiments, the display device can also cooperate with other display panels that require a backlight module.

In the embodiment shown in FIG. 2A , the backlight module includes a carrier 110 , a plurality of light sources 130 , a first support net 210 , and an optical control film 300 . The carrier board 110 has a bearing surface 111 for carrying the light source 130; wherein the bearing surface 111 has a first reflectivity, and the first reflectivity is preferably between 50% and 100%. The reflectance is preferably measured by comparing the white barium sulfate white powder with the reflectance of the barium sulfate white powder to determine the reflectance value of the other material. The carrier 110 is preferably made of a metal material such as an aluminum plate; however, in various embodiments, the carrier 110 may also be made of a plastic material. The bearing surface 111 is preferably formed by the surface of the body of the carrier 110. However, when the material reflectivity of the carrier 110 itself is insufficient, other reflective materials may be added to the body of the carrier 110 to form a carrier having a first reflectivity. Face 111.

The carrier board 110 further includes a plurality of winding units 150 disposed around the bearing surface 111. In the embodiment shown in FIG. 2A, the carrier 110 may include a bottom plate 181 of a midplane and a sidewall 183 formed by bending a side of the bottom plate 181, and the winding unit 150 may be formed as a hole in the sidewall 183. The wire passes through and changes direction after passing to achieve the technical characteristics of the winding. However, in different embodiments, as shown in FIG. 2B, the winding unit 150 can also be formed as a hook ring or the like that is erected on the side of the bearing surface 111 near the side, and the wire can also pass through and change direction. In order to achieve the technical characteristics of the winding.

As shown in FIG. 2A and FIG. 3, the bearing surface 111 is formed in a quadrangular shape, and has a first side 101, a second side 102, a third side 103 opposite to the first side 101, and a second side 102. The opposite fourth side 104. The first side 101 and the second side 102 together form a first corner 161, and the third side 103 and the fourth side 104 together form a second corner 162 which is diagonal to the first corner 161. The light source 130 is disposed on the bearing surface 111, and is preferably distributed in a column matrix manner in this embodiment. In the preferred embodiment, the light source 130 is a light emitting diode, but is not limited thereto.

As shown in FIG. 2A and FIG. 3, the first support net 210 is suspended above the light source 130 by the support of the carrier 110. The first support mesh 210 may be composed of a single wire or a composite of a plurality of wires. In this embodiment, the first support net 210 is composed of a single first support line 211; however, in different embodiments, the first support net 210 may also include a plurality of first support lines 211. As shown in FIG. 3, the first support line 211 passes through at least a portion of the winding unit 150 and is wound around the carrying surface 111 via the winding unit 150 to change direction. In other words, the winding unit 150 provides the first support line 211 and the second support line 212 to support, so that the first support net 210 can be suspended above the light source 130.

In the embodiment shown in FIG. 3, the portions of the first support mesh 210 spanning the support surface 111 all extend in the first direction X; the first direction X is preferably parallel to the first side 101. As shown in FIG. 3, the first support line 211 passes through the winding unit 150 and passes through the bearing surface 111 in the first direction X to reach the opposite winding unit 150. The winding unit 150 and the opposite winding unit 150 are preferably located on the second side 102 and the fourth side 104, respectively. After passing through the opposite winding unit 150, the first supporting wire 211 extends to extend along the side of the bearing surface 111 to reach the adjacent winding unit 150 on the same side, and from the adjacent winding unit 150. Passing through and re-folding back across the bearing surface 111 in the first direction X. The first support wire 211 can be formed in such a manner that the first support wire 211 can be bypassed in such a manner. In this embodiment, the first support net 210 is composed of a single first support line 211, which has the advantage that the tension of the entire first support net 210 can be adjusted at the same time by tightening or loosening the first support line 211; In different embodiments, a plurality of first support lines 211 may also be used to form the first support net 210 to apply different tensions at different positions of the first support net 210.

In the embodiment shown in FIG. 4, a portion of the first support mesh 210 extending across the load bearing surface 111 extends in a first direction X, and a portion extends in a second direction Y intersecting the first direction X; One direction X is preferably parallel to the direction of the first side 101, and the second direction Y is Preferably, it is parallel to the direction of the second side 102. The first support line 211 preferably starts from the first corner 161 and circumscribes above the bearing surface 111 in a manner similar to that shown in FIG. 3 to form a portion above the bearing surface 111 along the first direction X. A support net 210. When the first support line 211 passes through the winding unit 150 closest to the second corner 162 and on the fourth side 104, the first support line 211 is wound around the outside of the second corner 162 to form a turning portion. 205. By the formation of the turning portion 205, the first support line 211 can reach the winding unit 150 on the third side 103 closest to the second corner 162, and start to traverse the bearing surface 111 in the second direction Y. A portion of the first support mesh 210 is wound. With this arrangement, the first support net 210 can form an interlaced structure, which can provide a large supporting force.

As in the previous embodiment, the present embodiment is also composed of a single first support line 211, so that it is easier to adjust the tension of the entire first support net 210. In different embodiments, the two first support lines 211 may also respectively form a portion spanning the support surface 111 in the first direction X and a portion spanning the support surface 111 in the second direction Y to respectively adjust Tension in different directions. In addition, in this embodiment, the second side 102 and the fourth side 104 respectively have the same number of odd winding units 150 to form the turning portion 205 at the second corner 162. However, in different embodiments, when the second side 102 and the fourth side 104 respectively have the same number of even number of winding units 150 or different numbers of winding units 150, they may also be added outside the bearing surface 111. Winding is performed to change the winding direction across the bearing surface 111. Moreover, in the preferred embodiment, the first side 101 and the third side 103 preferably also have the same number of odd number of winding units 150, respectively. With this arrangement, the winding unit 150 that starts the winding of the first support line 210 and the winding unit 150 that finally passes out will be concentrated near the first corner 161. As a result, the tension on the first support net 210 is relatively easy to average, so that the tension on each side of the carrier plate 110 is also relatively average, which can reduce the unevenness.

As shown in FIG. 2 and FIG. 5 , the optical control film 300 is supported by the first support net 210 and disposed above the light source 130 , that is, a surface corresponding to the light emitted by the light source 130 . Preferably, the optical control film 300 is disposed on the first support net 210 in a placing manner. The optical control film 300 is configured to distribute light generated by the light source 130 from different positions of the optical control film 300; in a preferred embodiment, the optical control film 300 has a reflective surface 301 facing one side of the light source 130, and optically regulated The film 300 itself passes through a plurality of light exit holes 310. The light generated by the light source 130 can be reflected back and forth through the reflective surface 301 and the bearing surface 111, and the optical control film 300 is passed through the optical aperture 310. Thus, the density of the optical aperture 310 on different positions on the optical control film 300 can be adjusted. The size is used to distribute the light generated by the light source 130 by varying the aperture ratio per unit area at different locations. Further, a diffusion plate 600 may be disposed above the optical control film 300 to further further homogenize the light emitted from the optical control film 300. In order to reduce the influence of the first support net 210 on the optical performance, the first support line 211 is preferably a transparent optical grade wire or a thinner wire. However, in various embodiments, in order to achieve adjustment of the light distribution, a wire having a light absorbing effect may be used as the first support line 211.

Figure 6 shows an embodiment of an optical conditioning film 300. In this embodiment, the optical control film 300 includes a plurality of blocks 311 corresponding to the respective light sources 130. In the preferred embodiment, the light exit holes 310 in each block 311 are all the same, similar, or have a certain degree of correlation. In the block 311, the unit opening area ratio of the light exit hole 310 is centered on the corresponding light source projection position, and is gradually changed toward the outer side of the block 311. The unit light opening area ratio preferably means the area ratio of the light exit holes 310 within a unit area. In other words, the unit light opening area ratio is preferably a standardized ratio value without a unit. In the preferred embodiment, the unit opening area ratio varies as a function of a predetermined function. In other words, the function value of the preset function will gradually increase as the distance from the projected position of the light source increases. The preset function is preferably a polynomial function, such as a quadratic or cubic polynomial function, but is not limited thereto. Taking the preset function as a quadratic polynomial function as an example, the preset function may be: f(x)=ax ² +bx+c where x is the distance from each position in the block 311 to the projection position of the light source, f(x) Then, it can directly become the unit opening area ratio of the position or become a unit opening area ratio after multiplying by one parameter. With this design, the resulting backlight can be made more uniform.

As shown in FIG. 6, the projection of the portion of the first support line 211 across the load-bearing surface 111 on the optical control film 300 extends substantially along the boundary position of each of the blocks 311. In other words, the first support line 211 is located below the boundary position of the adjacent block 311. With this arrangement, the influence of the first support line 211 on the light distribution of each block 311 can be reduced without affecting the overall optical performance.

In the embodiment of FIG. 7A, the backlight module further includes a second support net 220. The second support net 220 is suspended above the first support net 210 by the support of the carrier 110. The second supporting net 220 is disposed substantially in the same manner as the first supporting net 210, and is also wound around the carrying surface 111 via the winding unit 150 by a single or a plurality of second supporting lines 221, as shown in FIG. The optical control film 300 is sandwiched between the first support net 210 and the second support net 220. By the clamping of the upper and lower sides, the support of the optical control film 300 is more stable, and it is difficult to shift and bend. In this embodiment, the second support net 220 is identical to the winding mode and path of the first support net 210, and is in a symmetrical state; however, in different embodiments, the winding path of the second support net 220 may be Contrary to the first support mesh 210, the tension on the carrier plate 110 is more balanced. For example, the turning portion 205 of the second support line 221 is disposed at the first corner 161, and the second corner 162 is taken into and out of the line. In addition, Like the first support line 211, the projections of the second support line 221 on the portion of the optical control film 300 across the bearing surface 111 extend substantially along the interface between the blocks 311, respectively.

In the embodiment shown in FIG. 7B, the winding paths of the first support net 210 and the second support net 220 are not overlapped with each other; in other words, the portions of the two across the bearing surface 111 are interlaced with each other, but not Overlapping. In addition, as shown in FIG. 7B, the projections of the first support line 211 and the second support line 221 on the optical control film 300 extend substantially along the boundary position between the different blocks 311, respectively. With this arrangement, the amount of wire can be reduced to achieve both weight reduction and cost reduction.

In addition, in the embodiment illustrated in Figure 7C, the first support mesh 210 and the second support mesh 220 provide support in different directions. As shown in FIG. 7C, the portions of the first support mesh 210 that straddle the bearing surface 111 are juxtaposed to each other and extend in the first direction X, respectively; and the portions of the second support mesh 220 that straddle the bearing surface 111 are side by side and respectively Extending in the second direction Y. With this design, the winding unit 150 through which the first support line 211 passes can be concentrated on the second side 102 and the fourth side 104, and the winding unit 150 through which the second support line 221 passes is concentrated. The first side 101 and the third side 103 are so that the two do not pass through the repeated winding unit 150, and are not easily overlapped during the winding process, which can reduce the difficulty of the winding process.

As shown in FIG. 8 , the backlight module further includes a first tension adjusting unit 910 and a second tension adjusting unit 920 respectively disposed on the carrier 110 . The first tension adjusting unit 910 is disposed corresponding to the outgoing wire winding unit 151 in the winding unit 150; the second tension adjusting unit 920 is disposed corresponding to the incoming wire winding unit 152 in the winding unit 150. In the condition of the foregoing embodiment, the outgoing wire winding unit 151 and the incoming wire winding unit 152 are respectively the second side 102 and the winding unit of the first side 101 closest to the first corner 161, so that Both ends of the first support line 211 are concentrated in the first Corner 隅 161. The first end 201 of the first support line 211 is connected to the first tension adjusting unit 910 after passing through the outgoing wire winding unit 151, and can change the tension according to the action of the first tension adjusting unit 910. The first support line 211 has a second end 202 opposite to the first end 201 and is connected to the second tension adjusting unit 920 after passing through the wire winding unit 152, and can change the tension according to the action of the second tension adjusting unit 920. In this embodiment, the first support net 210 is composed of a single first support line 211, and the first support line 211 has a turn portion 205. The line segment between the first end 201 and the turning portion 205 can be adjusted by the first tension adjusting unit 910 by the frictional force generated between the turning portion 205 and the winding unit 150 and the carrier plate 110; and at the second end 202 And the line segment between the turning portions 205 can be adjusted by the second tension adjusting unit 920.

It should be noted that the first tension adjusting unit 910 and the second tension adjusting unit 920 may exist separately, and the wire of one end not provided with the tension adjusting unit may be directly fixed to the carrier 110. In addition, in the first support net 210 composed of a plurality of first support lines 211, a corresponding tension adjustment unit may be disposed corresponding to each of the first support lines 211.

FIG. 9 shows an embodiment of the first tension adjustment unit 910. As shown in FIG. 9, the first tension adjusting unit 910 includes a base 930, a ratchet 950, and an outer cover 970. The pedestal 930 is disposed on the carrier 110, for example, on the sidewall 183, and is located on one side of the winding unit 150. The base 930 has a first ratchet 931; the first ratchet 931 is preferably a ring or a wheel ratchet. The ratchet 950 is rotatably disposed on the base 930 and has a second ratchet 951 formed on the wheel side 952 of the ratchet 950 to engage the first ratchet 931. The outer cover 970 is attached to the outer side of the ratchet 950. As shown in FIG. 9, the axis 955 of the ratchet 950 extends into the shaft hole of the outer cover 970 and the base 930, respectively. However, in different embodiments, the axis can be provided only by the base 930. The design of the hole on the ratchet 950. Engagement of the second ratchet 951 with the first ratchet 931 to allow the ratchet 950 to be single with respect to the base 930 The direction is rotated, and the rotation in the opposite direction is prohibited. The first end 201 of the first support line 211 is preferably connected to the groove 953 on the wheel surface of the ratchet wheel 950, and can be wound around the groove 953 of the ratchet wheel 950 as the ratchet wheel 950 rotates to change the first support line 211. The tension.

In the embodiment shown in FIGS. 10A and 10B, the backlight module further includes a first support post 700. The first support column 700 has a cylinder 710 and a support platform 730; wherein the support platform 730 extends radially outward from the cylinder 710. The cylinder 710 is erected on the bearing surface 111, and is formed with a receiving groove 711 which is annularly concave around the surface of the cylinder. The support platform 730 is preferably located below the receiving groove 711 and has a support surface 731. As shown in FIG. 10A, the support surface 731 is formed to receive one side groove wall of the groove 711. When assembled, the post 710 passes through a hole in the optical conditioning film 300 and provides support for the diffusion plate 600 above the optical conditioning film 300. The first support net 210 is at least partially embedded in the receiving groove 711 and supported by the support surface 731. In addition, the support surface 732 preferably also provides the bottom support of the optical control die 300 directly or indirectly.

In addition, in the embodiment shown in FIG. 11A and FIG. 11B, the backlight module may further include a second support column 800. The second support column 800 has a cylinder 810 and a support platform 830; wherein the support platform 830 extends radially outward from the cylinder 810. The column body 810 is erected on the bearing surface 111, and is formed with a receiving groove 811 formed by cutting from the column top 813 toward the bearing surface 111. The support platform 830 is preferably perpendicular to the receiving groove 711 and has a support surface 831. As shown in FIG. 11A, the receiving groove 811 is at least cut down to the support surface 831 or through the support surface 831. When assembled, the column top 813 passes through a hole in the optical conditioning film 300, and the first support mesh 210 is at least partially embedded in the receiving groove 811 and below the support surface 831. In addition, the support surface 732 preferably also provides a bottom support for the optical control die 300. Furthermore, the support surface 831 can optionally have a wire slot 833. The wire groove 833 extends in a direction in which the receiving groove 811 extends in the radial direction of the column 810 and communicates with the receiving groove 811. With this setting, the first branch The support net 210 protrudes from the receiving groove 811 and enters the wire groove 833 to be supported by the support platform 830.

The present invention has been described by the above-described related embodiments, but the above embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, modifications and equivalents of the spirit and scope of the invention are included in the scope of the invention.

110‧‧‧ Carrier Board

111‧‧‧ bearing surface

112‧‧‧ side

130‧‧‧Light source

131‧‧‧Outside light source

150‧‧‧Winding unit

210‧‧‧First support net

211‧‧‧First support line

300‧‧‧Optical Control Film

301‧‧‧reflecting surface

310‧‧‧Lighting hole

600‧‧‧Diffuser

Claims (17)

A backlight module includes: a carrier board having a bearing surface and a plurality of winding units surrounding the bearing surface; a plurality of light sources respectively disposed on the bearing surface; a first supporting net by the carrier board Supporting and suspended above the light sources; wherein the first support net comprises a first support line bypassing the support surface via at least a portion of the winding units, and supported by the winding units; An optical control film disposed above the light sources for supporting the first support mesh and having a plurality of light exit holes; wherein the optical control film distributes light generated by the light source to the light exit holes at different positions; and a first tension adjusting unit is disposed on the carrier and corresponds to one of the winding units; wherein the first supporting line has a first end passing through the outgoing winding unit The first tension adjusting unit is connected later, and the tension should be changed by the action of the first tension adjusting unit. The backlight module of claim 1, wherein a portion of the first support line extends across the support surface and then extends between the adjacent two winding units via the winding unit. The backlight module of claim 1, further comprising a second tension adjusting unit disposed on the carrier and corresponding to one of the winding units; wherein the first supporting line has A second end opposite to the first end passes through the wire winding unit and is connected to the second tension adjusting unit, and should be operated by the second tension adjusting unit to change the tension. The backlight module of claim 3, wherein a portion of the first support line before entering the outlet winding unit straddles the bearing surface in a first direction; the first support line enters the incoming line A portion of the front of the winding unit spans the bearing surface in a second direction intersecting the first direction. The backlight module of claim 4, wherein the carrier has a first corner, the outgoing winding The unit and the in-line winding unit are respectively the winding unit of the adjacent side of the first corner which constitutes the first corner, and the winding unit is closest to the first corner. The backlight module of claim 5, wherein the carrier has a second corner opposite to the first corner, the first support line has a turn between the first end and the second end a portion corresponding to the second corner; the portion of the first support line between the first end and the turning portion reciprocates across the bearing surface in the first direction, between the second end and the turning portion A portion of the portion reciprocates across the bearing surface in the second direction. The backlight module of claim 6, wherein the bearing surface is quadrangular and has a first side and a second side constituting the first corner, and a third side constituting the second corner a side edge and a fourth side edge; the first side edge is opposite to the third side edge and has the same number of odd number of winding units respectively; the second side edge is opposite to the fourth side edge and has the same number respectively An odd number of winding units. The backlight module of claim 6, wherein the winding unit is formed as a hole in the carrier, and the turning portion is closest to the second side from an adjacent side of the carrier that forms the second corner The winding unit of the corner is pierced and penetrated to extend around the outside of the second corner. The backlight module of claim 1, wherein the first tension adjusting unit comprises: a base disposed on the carrier and having a first ratchet; and a ratchet rotatably disposed on the base And a second ratchet meshes with the first ratchet to allow the ratchet to rotate unidirectionally relative to the base; wherein the first end is wound on the ratchet. The backlight module of claim 1, wherein the optical control film has a plurality of blocks respectively corresponding to the light sources; and a ratio of unit opening areas of the light exit holes in each of the blocks is projected closest to the light source The position is centered toward the outer side of the block, and the projection of the first support line across the portion of the bearing surface on the optical control film extends substantially along the boundary position of the blocks Stretch. The backlight module of claim 1, further comprising a second support net suspended by the support of the carrier on the first support net, and clamping the optical control film together with the second support net The second support net includes a second support line that is wound over the support surface via at least a portion of the winding units and supported by the winding units. The backlight module of claim 11, wherein the portion of the first support net that spans the bearing surface is juxtaposed with each other and extends in a first direction; the portion of the second support web that spans the bearing surface is mutually Side by side and extending in a second direction intersecting the first direction. The backlight module of claim 11, wherein the optical control film has a plurality of blocks respectively corresponding to the light sources; and a ratio of unit opening areas of the light exit holes in each of the blocks is projected closest to the light source The position is centered toward the outer side of the block, and the projections of the first support line and the second support line across the bearing surface on the optical control film extend substantially along different boundary positions of the blocks. . The backlight module of claim 1, further comprising a first support column, the first support column comprising: a cylinder disposed on the bearing surface, the cylinder forming a ring around the surface of the cylinder a receiving groove of the recess; and a supporting platform extending radially from the column; wherein the supporting platform has a supporting surface formed as a side groove wall of the receiving groove; the supporting surface Supporting the bottom surface of the first support net or the optical control film, and the first support net is at least partially embedded in the receiving groove. The backlight module of claim 1, further comprising a second support column, the second support column comprising: a column body erected on the bearing surface, the column body being formed from the column top toward the bearing Forming a groove in the underside; and a support platform extending radially from the column; wherein the support platform has a support surface, the receiving groove is at least undercut to the support surface; the support surface supports the optical control a bottom surface of the membrane, and the first support mesh is at least partially embedded in the receiving groove. The backlight module of claim 15, wherein the receiving groove is cut through the supporting surface, and a portion of the first supporting net embedded in the receiving groove is located below the supporting surface. The backlight module of claim 16, wherein the support surface is formed with a wire groove extending along a direction in which the receiving groove extends in a radial direction of the column and communicating with the receiving groove, the first support The network portion extends in the slot and the receiving slot.