TWI345112B - Direct type backlight module - Google Patents

Description

1345112 DESCRIPTION OF THE INVENTION: TECHNICAL FIELD OF THE INVENTION [0001] The present invention relates to a direct type backlight type, in particular to a direct type backlight mode slave that uses an LED as a light source. [Prior Art] [0002] In recent years, liquid crystal displays have been widely used due to their characteristics of lightness, sewnness, small size, low power consumption, and the like. Since the liquid crystal display panel itself does not have the characteristics of the light-emitting parameter [0003], the backlight module is required to provide a backlight for the display function of the liquid crystal display panel. The backlight module is divided into two types: side light type and direct type. For small and medium-sized liquid crystal displays, the edge-lit backlight module has the advantages of lightness, thinness, and low power consumption. However, with the development of technology, the demand for large-scale crystal-cutting displays is increasing, and the edge-lit backlight mode is increasing. The group is difficult to meet the brightness requirements of large-size liquid crystal displays, and thus the direct-lit backlight module has been rapidly developed. [0004] The light source used in the direct type square light module is generally a cold cathode ray tube (

Cold Cathode Fluorescent Lamps (CCFL) or Light Emitting Diode (LED). At present, LEDs have been increasingly used in large-size direct-lit backlight modules due to their high color purity, low operating voltage, and light weight. [0005] Please refer to FIG. A direct-lit backlight module using an LED as a light source generally includes a housing 210, an LED 220 as a light source, a reflective sheet 230, a first optical sheet 240, a second optical sheet 250, and a third optical sheet 260. The LED 220 is disposed in the housing 210 and includes a base 222 and a light-emitting portion 224 095 138 891. The light-emitting portion 224 is made of plastic. The reflection sheet 230 has a through hole (not shown in the form number A0101, page 3/21 pages, 1003137923-0 1345112, 100 years, O4fl 21, [0006] [0008] 095138891), the light-emitting portion 224 passes through the through hole. The first optical sheet 240, the second optical sheet 250, and the third optical sheet 260 may be a diffusion plate, a cymbal sheet, or the like, and are arranged in an order above the LED 220. However, the substrate of the reflective sheet 230 is generally a plastic sheet, so it is necessary to provide a metal plate 270 under the reflective sheet 230 to support the reflective sheet 230. Typically, the metal sheet 270 is a thinner aluminum plate. However, the manner in which the metal plate 270 supports the reflective sheet 230 increases the components, thereby increasing the weight and cost of the backlight module. Further, the thickness of the metal plate 270 is thin, and it is easily deformed after being pressed and is not easily recovered. When the metal plate 270 is deformed, it easily blocks the light beam emitted from the light-emitting portion 224 of the LED 220, and affects the light utilization efficiency of the LED 220. Further, it is necessary to open a mounting hole in the metal plate 270 to cooperate with the LED 220. Since the light-emitting portion 224 of the LED 220 is plastic, the hardness is low, and the mounting hole on the metal plate 270 during assembly is likely to damage the light-emitting portion 224. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a direct-type backlight module that can simplify the support of the reflective sheet. A direct-type backlight module includes a housing, a point source, and a reflective sheet. The housing has a bottom plate and at least one a raised portion extending from the bottom plate toward the inside of the backlight module. The reflection sheet has a through hole. The point source includes a base and a light emitting portion. The pedestal is placed on the bottom plate, and the illuminating portion passes through the through hole of the reflective sheet. The convex portion supports the reflective sheet, and the reflective sheet is fixed to the convex portion by adhesive bonding. Compared with the prior art, the direct type backlight module provides a supporting surface of the reflective sheet by the I & the starting part of the housing, thereby simplifying the supporting manner of the reflective sheet to reduce the backlight module. Weight 'cost savings. In addition, the straight form number A0101 Page 4 of 21

1003137923-0 1345112 On April 21, 100, according to the replacement of the page-type backlight module, the metal plate is omitted as the support portion of the reflection sheet, so there is no case where the light-emitting portion of the point light source is damaged due to the assembly of the metal plate, and there is no existence. The light is blocked by the deformation of the metal plate, thereby improving the utilization of light. [0009] Referring to FIG. 2, a first embodiment of the present invention provides a direct type backlight module 100. The backlight module 100 includes a housing 10, a plurality of light sources 20, a reflective sheet 30, a first optical sheet 40, a second optical sheet 50, and a third optical sheet 60.

[0010] The housing 10 includes a bottom plate 12 and at least one raised portion 14 extending from the bottom plate 12 toward the inside (ie, upwardly) of the backlight module 100. The raised portion 14 has a top plate 16 and side walls 18, and the side walls 18 are connected to the bottom plate 12. The raised portion 14 can be used to support and fix the reflective sheet 30. The light source 20 includes a susceptor 22 and a light emitting portion 24, and the susceptor 22 is placed on the bottom plate 12. The reflection sheet 30 has a through hole 301 through which the light emitting portion 24 of the light source 20 passes, and the top plate 16 of the convex portion 14 supports the reflection sheet 30. The first optical sheet 40, the second optical sheet 50, and the third optical sheet 60 may be a diffusion plate, a cymbal sheet, or the like, and are sequentially arranged above the light source 20. The light source 20 can be a point source such as a light emitting diode (LED). In the present embodiment, the light source 20 is an LED. A part of the light beam emitted from the light-emitting portion 24 of the light source 20 is directly incident on the first optical sheet 40, and another portion is reflected by the reflective sheet 30 and then incident on the first optical sheet 40, and then scattered through the first optical sheet 40 to be incident on the second optical sheet. 50 and the third optical sheet 60 are finally incident on the liquid crystal display panel (not shown). [0011] Referring to FIG. 3, the backlight module 100a of the second embodiment of the present invention is substantially the same as the backlight module 100 of the first embodiment. The backlight module 100a includes 095138891. Form No. A0101 Page 5 of 21 1003137923-0 1345112 On April 21st, 100th, the replacement of the hundred convex portion 14a and the reflection sheet 30a, the convex portion 14a supports the reflection sheet 30a » The difference is that the backlight module 10a also includes Adhesive 141. The adhesive 141 may be a double-sided tape, a solid glue or a glue or the like. In the present embodiment, the adhesive 141 is a double-sided tape. The reflection sheet 30a is held by the convex portion 14a by the adhesive 141. Referring to FIG. 4, a backlight module 1 〇〇b according to a third embodiment of the present invention is described above.

The backlight module 100 of the embodiment is substantially the same. The backlight module 10b includes a protrusion 14b and a reflection sheet 30b. The protrusion 14b supports the reflection sheet 30b. The difference is that the backlight module is configured. At least one hook 142 is disposed on the convex portion 14b of the b. The reflective sheet 30b is provided with at least one hook hole 302. The number of the hook holes 302 corresponds to the hook 142. In this embodiment, the number of the hook 142 and the hook hole 302 is two, and the hook hole 302 of the reflection piece 30b passes through the hook 142 and is held by the protrusion 14b.

[0013] Referring to FIG. 5, the backlight module 100c of the fourth embodiment of the present invention is substantially the same as the backlight module 1 of the first embodiment. The backlight module 100c includes a convex portion 14c and a reflection sheet 30c. The convex portion 14c supports the reflection sheet 30c. The difference is that the backlight module 100c further includes a pin 143, and the protrusion portion 14c and the reflection sheet 30c are provided with pin holes (not shown). The pin 143 is inserted into the pin hole of the reflection sheet 30c and the boss portion 14c to positively position the reflection sheet 30c. [0014] Referring to FIG. 6, the backlight module 100d of the fifth embodiment of the present invention is substantially the same as the backlight module 1 of the first embodiment. The backlight module 10d includes a convex portion 14d and a reflection. The sheet 30d' boss portion 14d supports the reflection sheet 30d. The difference is that the backlight module further includes a fastener 144 ′ protrusion 14d and a reflection piece 30d are provided with fastener holes (not labeled). The reflection sheet 095138891 Form number A0101 Page 6 of 21 1003137923-0 1345112

The correction replacement page 30d of April 21, 100 is held by the projection 14d by the engagement of the fastener 144 with the fastener hole. [0015] Referring to FIG. 7, a backlight module 100e according to a sixth embodiment of the present invention is substantially the same as the backlight module 100 of the first embodiment. The backlight module 100e includes a protrusion 14e and a reflection sheet 30e. The portion 14e supports the reflection sheet 30e. The difference is that the number of the reflection sheets 30e is plural and can be respectively placed on the convex portion 14e. In the present embodiment, the number of the reflection sheets 30e is two. The backlight module 100e further includes a reflective spacer 145. The reflective partition plate 145 is disposed on the convex portion 14e, and connects the two reflective sheets 30e, and can substantially separate two adjacent light sources 20e to increase the reflecting surface of the light source 20eib, thereby improving the backlight module 100e. [0016] Referring to FIG. 8, the backlight module 100f of the seventh embodiment of the present invention is substantially the same as the backlight module 100e of the sixth embodiment, and the backlight module 100f includes a convex portion 14f and a reflection. The sheet 30f, the convex portion 14f supports the reflection sheet 30f. The difference is that the backlight module 100f further includes a support body 146. The support body 146 is disposed on the convex portion 14f and resists the first optical sheet 40f φ to prevent the first optical sheet 40f from being deformed and affecting the performance of the backlight module 100f. [0017] Referring to FIG. 9, the present invention The backlight module 100g of the eighth embodiment is substantially the same as the backlight module 100 of the first embodiment. The backlight module 100g includes a housing 10g and a reflective sheet 30g. The casing 10g has a bottom plate 12g and a boss portion 14g extending upward from the bottom plate 12g. The boss portion 14g has a top plate 16g and a side wall 18g. The top plate 16g of the boss portion 14g supports the reflection sheet 30g. The difference is that the side wall 18g is provided with a heat dissipation hole 181g to increase the heat dissipation efficiency of the backlight module 100g. 095138891 Form No. A0101 Page 7 of 21 1003137923-0 1345112 [0018] Referring to FIG. 10, the backlight module 100h of the ninth embodiment of the present invention is substantially the same as the backlight module 100g of the above embodiment. The boss portion 14h and the reflection sheet 30h are provided, and the boss portion 14h has a top plate 16h and a side wall 18h. The top plate 16h of the boss portion i4h supports the reflection sheet 30h. The difference is that the backlight module further includes a ventilating dustproof body 14^, and the ventilating dustproof body 147 is disposed in the accommodating space formed by the protruding portion Uh to prevent the ring dust and foreign matter from entering the backlight module. Within 100h. [0020] It is understood that the above-mentioned inverse μ can also be held on the = convex portion by the method thereof. In the sixth, seventh, human, and ninth embodiments described above, the film may also be held on the convex portion of the casing. In the above-mentioned dominance, the #(10) of Xiang (4) provides the support surface of the anti-" piece, thus simplifying the support of the reflection sheet. The style is reduced to reduce the back. Secondly, the backlight module, "on the protrusion: the upper 6 is further provided with a fixing mechanism to hold the reflection sheet on the protrusion " G H+ μ ,, thereby fixing the reflection sheet of the simple one. In addition, the backlight module utilizes the shell The convex portion of the body can provide a support surface for providing the reflective spacer and the first optical sheet support body, thereby improving the uniformity of the light emitted by the backlight module.

[0022] In summary, the present invention complies with the requirements of the invention patent, and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a direct-lit backlight module of the prior art; 095138891 Form No. A0101 Page 8 of 21 1003137923-0 1345112 Correction replacement page of April 21, 2001 [0023] Figure 2 FIG. 3 is a partial schematic view showing a second embodiment of a direct type backlight module of the present invention; [0025] FIG. 4 is a direct type backlight module of the present invention. 5 is a partial schematic view of a fourth embodiment of a direct type backlight module of the present invention; [0027] FIG. 6 is a partial schematic view of a fifth embodiment of the direct type backlight module of the present invention; 7 is a cross-sectional view showing a sixth embodiment of a direct type backlight module of the present invention; [0030] FIG. 8 is a cross-sectional view showing a seventh embodiment of the direct type backlight module of the present invention; FIG. 10 is a cross-sectional view showing a ninth embodiment of the direct type backlight module of the present invention. [0032] [Description of main component symbols] Backlight module: 100 , 100a, 100b 100c, 100d, 100e, lOOf, lOOg, lOOh • [0033] housing: 10, lOg [0034] bottom plate: 12, 12g [0035] raised portions: 14, 14a, 14b, 14c, 14d, 14e, 14f, 14g, 14h [0036] Adhesive: 141 [0037] Hook: 142 [0038] Pin: 143 095138891 Form No. A0101 Page 9 / Total 21 Page 1003137923-0 1345112 1〇April 21st, press the replacement page [0039] Fastener: 144 [0040] Reflecting partition: 145 [0041] Support: 146 [0042] Breathable dustproof body: 147 [0043] Top plate: 16, 16g, 16h [0044] Side wall: 18, 18g, 18h [0045] Cooling hole: 181g

[0046] Light source: 20, 20e [0047] Base: 22 [0048] Light-emitting portion: 24 [0049] Reflecting sheet: 30, 30a, 30b, 30c, 30d, 30e, 30f, 30g, 30h [0050] Through-hole : 301 [0051] Snap hole: 302 [0052] First optical sheet: 40, 40f [0053] Second optical sheet: 50 [0054] Third optical sheet: 60 095138891 Form number A0101 Page 10 of 21 1003137923-0

Claims (1)

April 21, 100, nuclear replacement page 1345112 VII. Patent application scope: 1. A direct type backlight module, comprising a casing, a point light source and a reflection sheet, the casing has a bottom plate, and the reflection sheet has a through hole, The point light source includes a pedestal and a illuminating portion, and the pedestal is disposed on the bottom plate, and the illuminating portion passes through the through hole of the reflective sheet. The improvement is that the housing further has at least one extending from the bottom plate to the interior of the backlight module. a convex portion supporting the reflective sheet, and the reflective sheet is fixed to the convex portion by adhesive bonding. 2. The direct type backlight module of claim 1, wherein the protruding portion comprises a top plate and a side wall, the side wall being connected to the bottom plate. 3. The direct type backlight module of claim 2, wherein the side wall of the protruding portion is provided with a heat dissipation hole. 4. The direct-lit backlight module of claim 3, wherein the backlight module further comprises a breathable dust-proof body disposed in the accommodating space formed by the raised portion. 095138891 Form No. A0101 Page 11 of 21 1003137923-0