CN103574402A - Backlight device, liquid crystal module, and liquid crystal display - Google Patents
Backlight device, liquid crystal module, and liquid crystal display Download PDFInfo
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- CN103574402A CN103574402A CN201310060584.7A CN201310060584A CN103574402A CN 103574402 A CN103574402 A CN 103574402A CN 201310060584 A CN201310060584 A CN 201310060584A CN 103574402 A CN103574402 A CN 103574402A
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- rear wall
- limiting member
- liquid crystal
- underframe
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Abstract
The invention provides a backlight device, a liquid crystal module, and a liquid crystal display. The backlight device comprises a bottom rack, a light source, an optical member, and a plurality of limiting members. The bottom rack is provided with an opening and a rear wall. The light source is disposed on the rear wall of the bottom rack. The optical member is disposed on the opening side of the bottom rack, and can be used to receive the light emitted by the light source. The plurality of limiting members are disposed on the rear wall of the bottom rack, and can be used to limit the moving range of the optical member toward the rear wall. The measurement heights of the plurality of limiting members are different according to the different positions of the plurality of limiting members on the rear wall.
Description
Technical field
The present invention relates to back lighting device, Liquid Crystal Module and liquid crystal indicator.
Background technology
Recently, along with as the advantage that becomes thin, lightweight and consume energy so low, such as the flat display apparatus of liquid crystal indicator, be widely used as the image display device of various computers etc.
For example, light transmissive liquid crystal display apparatus has wherein liquid crystal layer and remains on the liquid crystal cells between a pair of transparency carrier, and be arranged on liquid crystal cells rear side (that is, on the opposite side of image display surface) and for light source light being directed to the back lighting device of liquid crystal cells.Back lighting device be categorized into that light source is directly arranged in Direct-type below of liquid crystal cells and light guide plate is directly arranged in after liquid crystal cells and light source arrangement at light guide plate side light type (edge-light type) around.
In direct backlight device, such as cathode fluorescent tube or LED(light emitting diode) light source be directly arranged in after liquid crystal cells.LED is used to require to have in the television receiver of high image quality as the direct backlight device of direct light source, because use this direct backlight device to make it possible to increase by control the brightness degree of a large amount of LED on the basis in region one by one the contrast that shows image.
Summary of the invention
In traditional direct backlight device, high flat degree and uniformity in order to ensure the distance of the light source of the optical component with such as optical sheet and diffusion sheet, be arranged in supporting member or position regulation member in the underframe (chassis) of back lighting device equably.In recent years, along with the further increase of the thickness of television receiver, the underframe of back lighting device has been used as the main components of television receiver more and more.Exist circuit board to be attached to the situation that the underframe of back lighting device or the base bracket of TV receiver are fixed to the underframe of back lighting device.In these cases, the phenomenon of the underframe distortion of back lighting device may occur, and therefore, supporting member is pressed a part for optical component or liquid crystal cells.Thereby this may cause keeping causing the inhomogeneous problem of Luminance Distribution with high flat degree and the high uniformity of the distance of the light source of optical component.
The present invention makes in situation in the above, therefore even and an object of the present invention is to provide a kind of underframe that light source is installed and be out of shape in a way the direct backlight device that also can keep uniform luminance to distribute, and the Liquid Crystal Module and the liquid crystal indicator that are combined with this back lighting device.
According to an embodiment, back lighting device comprises underframe, light source, optical component and a plurality of limiting member.Underframe has opening and rear wall.Light source arrangement is on the rear wall of underframe.Optical component is arranged in the open side of underframe and receives from the light of light source transmitting.The scope that a plurality of limiting members are arranged on the rear wall of underframe and restriction optical component moves towards rear wall.Position according to a plurality of limiting members on rear wall, the height of measuring from rear wall of a plurality of limiting members is different.
Accompanying drawing explanation
Fig. 1 is the stereogram illustrating according to the outward appearance of the liquid-crystal apparatus of an embodiment;
Fig. 2 is the sectional view illustrating according to the liquid-crystal apparatus of this embodiment;
Fig. 3 is the stereogram illustrating according to the outward appearance of the Liquid Crystal Module of this embodiment;
Fig. 4 is that general introduction is according to the exploded perspective view of the structure of the Liquid Crystal Module of this embodiment;
Fig. 5 is the stereogram that rear underframe is shown and is arranged in the outward appearance of the light supply apparatus on the rear wall of rear underframe;
Fig. 6 A is the front view (that is, as the view of the side observation from opening) of light supply apparatus, and
Fig. 6 B is the sectional view that the line B-B in Fig. 6 A of light supply apparatus intercepts;
Fig. 7 is near the sectional view of a part (limiting member and its) for Liquid Crystal Module;
Fig. 8 is near the sectional view of a part (another kind of limiting member and its) for Liquid Crystal Module;
Fig. 9 is the sectional view of state that the rear wall distortion of rear underframe is shown;
Figure 10 illustrates the stereogram that is different from the rear underframe of those structures shown in Fig. 5 and the outward appearance of light supply apparatus;
Figure 11 is according to the front view corresponding with rear wall rear underframe and light supply apparatus Figure 10.
The specific embodiment
According to an embodiment, back lighting device comprises underframe, light source, optical component and a plurality of limiting member.Underframe has opening and rear wall.Light source arrangement is on the rear wall of underframe.Optical component is arranged in the open side of underframe and receives the light sending from light source.The scope that a plurality of limiting members are arranged on the rear wall of underframe and restriction optical component moves towards rear wall.Position according to a plurality of limiting members on rear wall, the height of measuring from rear wall of a plurality of limiting members is different.
Hereinafter, a plurality of embodiments are described with reference to the accompanying drawings.Fig. 1 is the stereogram illustrating according to the outward appearance of the liquid-crystal apparatus 1 of this embodiment.Fig. 2 be according to the liquid-crystal apparatus 1 of this embodiment, along the sectional view of the line A-A intercepting of Fig. 1.Liquid-crystal apparatus 1 comprises the support 3 of main body 2 and supportive body 2.Liquid Crystal Module 4 is arranged in main body 2 on front side.For drive the circuit board 5 of Liquid Crystal Module 4 and power supply circuit board 6 be arranged in Liquid Crystal Module 4 after.
The frame (cabinet) of preceding article frame (bezel) 7 and rear frame 8 formation main bodys 2.More particularly, preceding article frame 7 forms by forward part, diapire and two sidewalls of photograph frame-like antetheca and roof, and rear bar frame 8 is formed by rear section, diapire and two sidewalls of roof.Screen 9 is by the display section of the window 7a exposure of the preceding article frame 7 of Liquid Crystal Module 4.
Fig. 3 is the stereogram illustrating according to the outward appearance of the Liquid Crystal Module 4 of this embodiment.Fig. 4 is the exploded perspective view showing according to the structure of the Liquid Crystal Module 4 of this embodiment.Liquid Crystal Module 4 comprises front covering 10, liquid crystal cells 11 and back lighting device 12.
Diffuser plate 16 is translucent white resin plates and has the external dimensions roughly the same with liquid crystal cells 11.Diffuser plate 16 makes from the light diffusion of light supply apparatus 14 transmittings to produce uniform Luminance Distribution at whole screen 9.Except light diffusion function, diffuser plate 16 is required to have the characteristic such as high thermal resistance and high-dimensional stability.Material about diffuser plate 16, in order to strengthen light diffusion function, such as the light diffusing agent of acrylic acid or silicone, be added into the styrene-methylmethacrylate copolymer such as MS() resin or PS(polystyrene) resin, PC(polystyrene) matrix resin of resin.
Each in optical sheet 17 or optical sheet 17 is prismatic lens, diffusion sheet, polarization sheet etc., and has the outer shape roughly the same with diffuser plate 16.Prismatic lens causes the light that diffuser plate 16 sends to be advanced towards the liquid crystal cells 11 in converged state, and prevents that thus brightness from reducing.Diffusion sheet be in function with similarly membranaceous of diffuser plate 16.Any function is used one or more optical sheets 17 as required.
It is by the frame-like member of resin molded or the molded formation of aluminium extrusion that framework 18 is pressed in centre.Centre presses that framework 18 has front side (opening 13c side) with respect to rear underframe 13 location diffuser plate 16 and optical sheet 17 and with respect to the function of rear underframe 13 location liquid crystal cells 11.
Front covering 10 is by the frame-like member of resin molded or the molded formation of aluminium extrusion.Front covering 10 is fixed to back lighting device 12 so that the peripheral part of liquid crystal cells 11 is interposed between front covering self and back lighting device 12.Rear underframe 13 is used as the main underframe of back lighting device 12 and limits the outer shape of Liquid Crystal Module 4 together with front covering 10.Rear underframe 13 guarantees that with front covering 10 Liquid Crystal Module 4 is as the necessary intensity of flat structures.
Fig. 5 is the stereogram that rear underframe 13 is shown and is arranged in the outward appearance of the light supply apparatus 14 on the rear wall 13a of rear underframe.Fig. 6 A is the front view (that is, the view of observing from that side of opening 13c) of light supply apparatus 14, and Fig. 6 B is the sectional view along the line B-B intercepting in Fig. 6 A of light supply apparatus 14.Because back lighting device 12 is Direct-types, so light supply apparatus 14 is arranged in the almost top of whole rear wall 13a of rear underframe 13.
For example, each light-emitting component 21 is to have the Light-Emitting Diode in vertical and horizontal direction with several millimeters of external dimensions.A plurality of light emitting diodes are arranged on light-emitting component terminal plate 20 with the spacing of several millimeters to several centimetres.
For supplying with for driving the connector (not shown) of the electric power of light-emitting component 21 to be arranged on the end of each light-emitting component terminal plate 20.In the situation that each light-emitting component terminal plate 20 is flexible connection board, flexible connection board can extend into and be connected to for driving the circuit board 5(of light-emitting component 21 not use connector).A part of heat that light-emitting device 14 produces is directed into rear underframe 13 and dissipates there.
For limiting optical component 15, towards a plurality of limiting members 22 and 23 of the moving range of the rear wall 13a of rear underframe 13, be arranged in rear wall 13a.Limiting member 22 and 23 is moulded parts of transparent or semitransparent resin.As shown in Fig. 5 and Fig. 6 A and Fig. 6 B, limiting member 22 and 23 is arranged between photocell terminal plate 20.Alternatively, limiting member 22 and 23 can be arranged as through the perforation forming by each photocell terminal plate 20.Limiting member 22 and 23 is fixed to rear wall 13a by bonding, screw joint, interference fit etc.
The Swelling and contraction distortion that may cause due to heating as the diffuser plate 16 of in optical component 15 or along with the time is out of shape, thereby towards rear wall 13a distortion.Even in this case, thus limiting member 22 and 23 also limits the distortion of diffuser plate 16 and keeps the flatness of diffuser plate and prevent that diffuser plate from contacting with light-emitting component 21.
Because limiting member 22 and limiting member 23 are arranged in the zones of different of rear wall 13a, so they are in height different.The limiting member 23 of middle section (the dotted line E by Fig. 6 A indicates) that is arranged in rear wall 13a is lower than the limiting member 22 of neighboring area (dotted line C and D by Fig. 6 A indicate) that is arranged in rear wall.
Fig. 7 is near the sectional view of a part (limiting member 22 and) for Liquid Crystal Module 4, and Fig. 8 is near the sectional view of a part (limiting member 23 and) for Liquid Crystal Module 4.The height H 1 of each limiting member 22 is the length between its top (tip) 22a and the surface of rear wall 13a.Symbol L1 represents the length in the gap between the top 22a of each limiting member 22 and the surperficial 16a relative with rear wall 13a of diffuser plate 16.Allow the surperficial 16a movable length L1 of diffuser plate 16.Distance M between the surperficial 16a of diffuser plate 16 and the surface of rear wall 13a is definite by the distance between surperficial 16a and photocell 21, and this distance is optical specification.
As shown in Figure 8, the height H 2 of each limiting member 23 is the length between its top 23a and the surface of rear wall 13a.Symbol L2 represents the length in the gap between the top 23a of each limiting member 23 and the surperficial 16a of diffuser plate 16.Because height H 2 is less than height H 1, so distance L 2 is longer than distance L 1.Because shorter limiting member 23 is arranged in the middle section of rear wall 13a of rear underframe 13, even if the top 23a that therefore diffuser plate 16 is deformed to some degree limiting member 23 also falls apart 16 not according to companding.
Fig. 9 is the viewgraph of cross-section of state that the rear wall 13a distortion of rear underframe 13 is shown.When circuit board 5 and circuit board 6 is attached to or support 3 is fixed to 13dShi rear surface, rear surface 13d(rear wall 13a) may be out of shape.This distortion is tending towards occurring in the core of rear wall 13a especially.As long as deformation length F be shorter than length L 2 so the top 23a of limiting member 23 just not according to companding, fall apart 16.Because this distortion is tending towards occurring in the core of rear wall 13a, by the height setting of the limiting member in the core of rear wall 13a, be that more urine is suitable so.
If limiting member 22 is also arranged in the core of rear wall 13a, the possibility that deformation length F becomes larger than distance L I will be high, and the top 22a of limiting member 22 presses diffuser plate 16, so liquid crystal cells 11 is out of shape and in Luminance Distribution, occurs inhomogeneous.
As mentioned above, for being arranged as relatively with the rear wall 13a of rear underframe 13 for limiting two kinds of limiting members 22 and 23 of the moving range of optical element, the limiting member 22 with height H I is arranged in the neighboring area of rear wall 13a and the limiting member 23 with the height H 2 of height H of being less than 1 is arranged in the central area of rear wall 13a.By this measure, even if the rear wall 13a of rear underframe 13 has distortion to a certain degree, the top 23a of limiting member 23 also falls apart 16 or liquid crystal cells 11 not according to companding, thereby can make Luminance Distribution keep evenly.
Figure 10 illustrates the stereogram that is different from the rear underframe 13 of those structures shown in Fig. 5 and the outward appearance of light supply apparatus 14.Figure 11 is the rear wall 13a of rear underframe 13 and the front view corresponding with Figure 10 of light supply apparatus 14 (that is the view of, observing as the side from opening 13c).In the structure shown in Figure 10 and Figure 11, do not have limiting member to be arranged in the middle section (G surrounds by dotted line) of rear wall 13a of rear underframe 13.Except the middle body being surrounded by dotted line G, limiting member 22 and 23 is arranged with the same way as with shown in Fig. 6 A.Same by this measure, even if the rear wall 13a of rear underframe 13 has distortion to a certain degree, limiting member 23 also falls apart 16 not according to companding, thereby can make Luminance Distribution keep evenly.
The invention is not restricted to embodiment self above, and without departing from the spirit and scope of the present invention in the situation that, in the practice stage, such mode that can change in many ways with composed component embodies.And can envision multiple creative concept by being suitably combined in disclosed a plurality of element in each embodiment.For example, can omit several in the element in each embodiment.In addition suitably combination in the element of different embodiments.
Although described some embodiments, these embodiments are only that the mode by example presents, and are not used in and limit the scope of the invention.In fact, the embodiment of novelty described herein can embody with multiple other forms; In addition,, in the situation that not departing from spirit of the present invention, can the form of embodiment described herein be made various omissions, replaces and be changed.Claims and equivalent thereof are intended to cover these forms or the distortion that drop in scope and spirit of the present invention.
Claims (10)
1. a back lighting device, comprising:
The underframe with opening and rear wall;
Be arranged on the light source on the described rear wall of described underframe;
Optical component, described optical component is arranged in the open side of described underframe and receives from the light of described light source transmitting; And
A plurality of limiting members, described a plurality of limiting members are arranged on the described rear wall of described underframe and limit described optical component towards the moving range of described rear wall,
Wherein, the position according to described a plurality of limiting members on described rear wall, the height of measuring from described rear wall of described a plurality of limiting members is different.
2. back lighting device according to claim 1,
Wherein, described a plurality of limiting members comprise the first limiting member in the neighboring area that is arranged on described rear wall and are arranged on the second limiting member in the middle section of described rear wall, and
The height of described the first limiting member is different from the height of described the second limiting member.
3. back lighting device according to claim 1,
Wherein, described a plurality of limiting members comprise the first limiting member in the neighboring area that is arranged on described rear wall and are arranged on the second limiting member in the middle section of described rear wall, and
The height of described the second limiting member is less than the height of described the first limiting member.
4. back lighting device according to claim 2,
Wherein, the height of described the second limiting member comprises zero, and
Do not have limiting member to be arranged in the pericentral region of described rear wall.
5. a Liquid Crystal Module, comprising:
Transflective liquid crystal unit is that the external form of described transflective liquid crystal unit is essentially rectangular and be configured as tabular; And
Back lighting device, described back lighting device comprises:
The underframe with opening and rear wall;
Be arranged on the light source on the described rear wall of described underframe;
Optical component, described optical component is arranged in the open side of described underframe and receives from the light of described light source transmitting; And
A plurality of limiting members, described a plurality of limiting members are arranged on the described rear wall of described underframe and limit described optical component towards the moving range of described rear wall,
Wherein, the position according to described a plurality of limiting members on described rear wall, the height of measuring from described rear wall of described a plurality of limiting members is different.
6. Liquid Crystal Module according to claim 5,
Wherein, described a plurality of limiting members comprise the first limiting member in the neighboring area that is arranged on described rear wall and are arranged on the second limiting member in the middle section of described rear wall, and
The height of described the first limiting member is different from the height of described the second limiting member.
7. Liquid Crystal Module according to claim 5,
Wherein, described a plurality of limiting members comprise the first limiting member in the neighboring area that is arranged on described rear wall and are arranged on the second limiting member in the middle section of described rear wall, and
The height of described the second limiting member is less than the height of described the first limiting member.
8. a liquid crystal indicator, comprising:
Transflective liquid crystal unit is that the external form of described transflective liquid crystal unit is essentially rectangular and be configured as tabular;
Back lighting device, described back lighting device comprises:
The underframe with opening and rear wall;
Be arranged on the light source on the described rear wall of described underframe;
Optical component, described optical component is arranged in the open side of described underframe and receives from the light of described light source transmitting; And
A plurality of limiting members, described a plurality of limiting members are arranged on the described rear wall of described underframe and limit described optical component towards the moving range of described rear wall,
Wherein, the position according to described a plurality of limiting members on described rear wall, the height of measuring from described rear wall of described a plurality of limiting members is different; And
Drive the circuit board of described light source.
9. liquid crystal indicator according to claim 8,
Wherein, described a plurality of limiting members comprise the first limiting member in the neighboring area that is arranged on described rear wall and are arranged on the second limiting member in the middle section of described rear wall, and
The height of described the first limiting member is different from the height of described the second limiting member.
10. liquid crystal indicator according to claim 8,
Wherein, described a plurality of limiting members comprise the first limiting member in the neighboring area that is arranged on described rear wall and are arranged on the second limiting member in the middle section of described rear wall, and
The height of described the second limiting member is less than the height of described the first limiting member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-164211 | 2012-07-24 | ||
| JP2012164211 | 2012-07-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103574402A true CN103574402A (en) | 2014-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310060584.7A Pending CN103574402A (en) | 2012-07-24 | 2013-02-26 | Backlight device, liquid crystal module, and liquid crystal display |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109683397A (en) * | 2019-02-20 | 2019-04-26 | 苏州众显电子科技有限公司 | Back lighting device, Liquid Crystal Module and liquid crystal display device |
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| CN1952755A (en) * | 2005-10-21 | 2007-04-25 | 鸿富锦精密工业（深圳）有限公司 | Back light module and holding device of strip lamp |
| TWM327040U (en) * | 2007-05-08 | 2008-02-11 | Chunghwa Picture Tubes Ltd | Backlight module |
| CN101344671A (en) * | 2007-07-13 | 2009-01-14 | 群康科技(深圳)有限公司 | Directly-down back light module unit and liquid crystal display device |
| JP2011248121A (en) * | 2010-05-27 | 2011-12-08 | Panasonic Liquid Crystal Display Co Ltd | Liquid crystal display device |
| CN103090264A (en) * | 2011-11-04 | 2013-05-08 | 奇菱光电股份有限公司 | Direct Type Backlight Module |
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2013
- 2013-02-26 CN CN201310060584.7A patent/CN103574402A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1952755A (en) * | 2005-10-21 | 2007-04-25 | 鸿富锦精密工业（深圳）有限公司 | Back light module and holding device of strip lamp |
| TWM327040U (en) * | 2007-05-08 | 2008-02-11 | Chunghwa Picture Tubes Ltd | Backlight module |
| CN101344671A (en) * | 2007-07-13 | 2009-01-14 | 群康科技(深圳)有限公司 | Directly-down back light module unit and liquid crystal display device |
| JP2011248121A (en) * | 2010-05-27 | 2011-12-08 | Panasonic Liquid Crystal Display Co Ltd | Liquid crystal display device |
| CN103090264A (en) * | 2011-11-04 | 2013-05-08 | 奇菱光电股份有限公司 | Direct Type Backlight Module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109683397A (en) * | 2019-02-20 | 2019-04-26 | 苏州众显电子科技有限公司 | Back lighting device, Liquid Crystal Module and liquid crystal display device |
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Application publication date: 20140212 |