CN1584696A

CN1584696A - Liquid crystal display and its backlight assembly

Info

Publication number: CN1584696A
Application number: CN 200410047292
Authority: CN
Inventors: 傅世泽; 许丁士; 黄瑞隆
Original assignee: AU Optronics Corp
Current assignee: AUO Corp
Priority date: 2004-05-28
Filing date: 2004-05-28
Publication date: 2005-02-23
Anticipated expiration: 2024-05-28
Also published as: CN100373227C

Abstract

A liquid crystal display and a backlight assembly thereof comprise a frame, a first supporting part, a second supporting part and a film layer. The first supporting part and the second supporting part are arranged on the frame. The membrane layer comprises a first limiting part and a second limiting part, and the membrane layer is arranged on the frame through the first limiting part and the second limiting part by virtue of the first supporting part and the second supporting part respectively. When the frame is at a first position, the first supporting part is partially contacted with the inner wall of the first limiting part to carry the membrane layer; when the frame is at a second position, the second supporting part is contacted with the inner wall of the second limiting part to bear the film layer.

Description

LCD and backlight assembly thereof

Technical field

The present invention is relevant for a kind of LCD and backlight assembly thereof, particularly relevant for a kind of backlight assembly with the diaphragm location structure that prevents that ripple (mura defect) from producing.

Background technology

In recent years, the market share of LCD (TFT-LCD) improves year by year and has almost replaced conventional cathode ray tube (CRT) display, be widely used on the various electronic goods, for example: PDA(Personal Digital Assistant), mobile computer, desktop PC, TV or the like.Moreover for adapting to multimedia presenting and different visual perceptions' demand, for general LCD provides the design of rotary type, also, the user can be adjusted to 0 °, 90 °, 180 °, 270 ° or other any angle with it according to its hobby.Yet, along with the maximization panel demand, the deadweight of panel also becomes the significant consideration of the LCD of rotary type.

Figure 1A shows the synoptic diagram of the backlight assembly 10A in No. the 449048th, the TaiWan, China patent announcement, has disclosed the fixed sturcture about the blooming lamella 120 of backlight assembly 10A in this patent case.Backlight assembly 10A comprises at least one light source (not shown), a plurality of blooming lamella (optical films) 120, reaches a framework (frame) 15, wherein, light source is arranged between blooming lamella 120 and the framework 15, and reach being uniformly dispersed by the light that light source sent through blooming lamella 120 (for example: diffusion sheet, prismatic lens etc.), and then produce required mixed light color.For convenience of description, in Figure 1A, omitted the panel and last lower house of LCD, so with the clear fixed sturcture of expressing backlight assembly 10A.

Has outward extending extension 121,122,123 and 124 around each blooming lamella 120.Then be respectively equipped with hole 121a, 122a, 123a and 124a in the middle of each extension 121,122,123 and 124.And framework 15 is provided with four grooves 151,152,153 and 154, corresponds respectively to extension 121,122,123 and 124.Groove 151,152 is respectively equipped with projection 151a, 152a in addition, and groove 153,154 is respectively equipped with barb 153a, 154a.In conjunction with the blooming lamella 120 of fixing backlight assembly 10A during to framework 15, the extension 121,122,123 of blooming lamella 12 and 124 hole 121a, 122a, 123a and 124a make projection 151a, 152a and barb 153a, 154a pass wherein respectively, extension 121,122,123 and 124 just is placed in groove 151,152,153 and 154, so blooming lamella 120 can firmly fixedly be embedded in the framework 15 to prevent that blooming piece layer 120 from coming off.

Yet, above-mentioned design only has fixed function, and the mould processing procedure complexity of groove and fixation kit (barb or projection), not only expensive, and dismounting is consuming time, in addition, there is no and consider that temperature variation can cause the rising-heat contracting-cold effect of blooming piece, and then cause the phenomenon of four jiaos anchor point upper stress centrostigma generation ripple.

Therefore, in No. the 552440th, TaiWan, China patent announcement, propose a kind of backlight assembly 10B, its purpose is the fixed form that prevents the blooming lamella of ripple generation, and shown in 1B and 1C figure, blooming lamella 120 is arranged on the framework 15b.One extension 125 is only arranged on one side of each blooming lamella, and form a hole 125b on the extension 125.Before the assembling blooming lamella 120, need with the anchor clamps (not shown) all kinds of blooming pieces 120 to be fixed earlier, also be, the groove 150 of necessary extension 125 of alignment earlier and framework 15b, after again blooming lamella 120 being put on the framework 15b, need in addition by fixation kit (as the collocation of latch 120a and holder 120b), and blooming lamella 120 is fixed on the framework 15b.Yet its shortcoming is: though firm blooming lamella 120, its dismounting is consuming time, and easy fitted does not need to use extra anchor clamps and part again.

In addition, if need to change LCD put angle the time, after for example LCD being inverted 180 degree, because the fixed position of all blooming lamella 120 is all on unique anchor point P, also, the asymmetric design of anchor point P, under the terrestrial attraction effect or when rising-heat contracting-cold the time, stress will all concentrate on the anchor point P on the blooming piece 120, causes the distortion of blooming lamella 120, causes problems such as optical performance inequality and local ripple vestige to produce.

Summary of the invention

In view of this, the object of the present invention is to provide a kind of backlight assembly, comprise a framework, one first support, one second support and a membrane layer.First support and second support are arranged at framework.Membrane layer comprises one first restrictions and one second restrictions, and membrane layer passes first restrictions and second restrictions respectively by first support and second support and is arranged on the framework.When framework was in a primary importance, first support partly was contacted with the inwall of first restrictions with the carrier film lamella; When framework was in a second place, second support partly was contacted with the inwall of second restrictions with the carrier film lamella.

First restrictions is a perforation or a groove, and second restrictions is a perforation or a groove.

Again, first restrictions and second restrictions are formed at respectively on the opposed side edges of membrane layer.

Again, membrane layer also comprises one the 3rd restrictions and one the 4th restrictions, the 3rd restrictions is formed at respectively on the two relative corners of membrane layer with the 4th restrictions, and one the 3rd support and one the 4th support, the 3rd support and the 4th support are arranged on the framework, and pass the 3rd restrictions and the 4th restrictions respectively.

Again, membrane layer also comprises one the 3rd restrictions and one the 4th restrictions, the 3rd restrictions and the 4th restrictions are arranged on two adjacent on membrane layer corners respectively, and one the 3rd support and one the 4th support, the 3rd support and the 4th support are arranged on the framework, and pass the 3rd restrictions and the 4th restrictions respectively.

Again, first restrictions and second restrictions are formed at respectively on the two relative corners of membrane layer again, and first restrictions and this second restrictions are arranged on two adjacent on this membrane layer corners respectively.

First restrictions and second restrictions are symmetrical arranged mutually with the central point of membrane layer.

When framework was in the second place, first support and first restrictions were at a distance of one first gap; When framework was in primary importance, second support and second restrictions were at a distance of one second gap.

This first support and this second support can be a projection, a right cylinder or a rectangular parallelepiped.

First restrictions and the second restrictions shape can be the rectangle or the polygon of circle, ellipse, rectangle, fillet.

Again, when framework was in primary importance, membrane layer was subject to first restrictions and first support in its moving range vertical with the action of gravity direction, and the combination restriction membrane layer of the framework and first support is in the moving range of the bearing of trend of first support.

Again, when framework was in the second place, membrane layer was subject to second restrictions and second support in its moving range vertical with the action of gravity direction, and the combination restriction membrane layer of the framework and second support is in the moving range of the bearing of trend of second support.

In a preferred embodiment, first restrictions is oval, and when framework turned to the primary importance or the second place, the major axis of oval restrictions was provided with along the action of gravity direction of framework, and the length of the minor axis of oval restrictions then limits the mobile range of first support.

Again, framework also comprises a fluorescent tube support sector, and first support and second support are extended towards membrane layer by fluorescent tube support sector.

According to the present invention, a kind of LCD also is provided, it comprises a housing and a backlight assembly.Housing can move between a primary importance and a second place.Backlight assembly is arranged at housing, comprises a framework and a membrane layer.Framework comprises one first support and one second support.Membrane layer comprises one first restrictions and one second restrictions.When housing was in primary importance, first support part supports, first restrictions was so that membrane layer reaches the location, and second support and the setting disconnected from each other of second restrictions; When housing was in the second place, second support part supports, second restrictions was so that membrane layer reaches the location, and first support and the setting disconnected from each other of first restrictions.

Again, first restrictions is a hole, and it is shaped as the rectangle or the polygon of circle, ellipse, rectangle, fillet.Second restrictions is a hole, and it is shaped as the rectangle or the polygon of circle, ellipse, rectangle, fillet.

When framework is in primary importance, has a gap between second restrictions and second support; When framework is in the second place, has a gap between first restrictions and first support.

For above and other objects of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and in conjunction with the accompanying drawings, be described in detail below.

Description of drawings

Figure 1A is the decomposing schematic representation of the backlight assembly of No. the 449048th, TaiWan, China patent announcement;

Figure 1B is the decomposing schematic representation of the backlight assembly of No. the 552440th, TaiWan, China patent announcement;

Fig. 1 C is the local enlarged diagram of the backlight assembly of No. the 552440th, TaiWan, China patent announcement;

Fig. 2 A shows the LCD (200) of the first embodiment of the present invention;

Fig. 2 B shows the sectional view after basis is dissectd along line segment (i-i) direction among Fig. 2 A;

Fig. 3 A shows the sectional view after basis is dissectd along line segment (ii-ii) direction among Fig. 2 A, wherein, and the membrane layer that mutually combines (12) and a plurality of support (P ₁) be co-located on a primary importance;

Figure when the structure among Fig. 3 B displayed map 3A is in another state, wherein, the membrane layer that mutually combines (12) and a plurality of support (P ₁) when being co-located on a second place;

Fig. 3 C is that one of the first embodiment of the present invention changes example;

Fig. 4 A is the synoptic diagram of the second embodiment of the present invention, wherein, and the membrane layer that mutually combines (1 2b) and a plurality of support (P ₁', P ₂', P ₃', P ₄', P ₅', P ₁", P ₂", P ₃", P ₄", P ₅") be co-located on a primary importance;

Figure when the structure among Fig. 4 B displayed map 4A is in another state, wherein, the membrane layer that mutually combines (12b) and a plurality of support (P ₁', P ₂', P ₃', P ₄', P ₅', P ₁", P ₂", P ₃", P ₄", P ₅") be co-located on a second place;

Figure when the structure among Fig. 4 C displayed map 4A is in another state, wherein, the membrane layer that mutually combines (12b) and a plurality of support (P ₁', P ₂', P ₃', P ₄', P ₅', P ₁", P ₂", P ₃", P ₄", P ₅") be co-located on one the 3rd position; And

Figure when the structure among Fig. 4 D displayed map 4A is in another state, wherein, the membrane layer that mutually combines (12b) and a plurality of support (P ₁', P ₂', P ₃', P ₄', P ₅', P ₁", P ₂", P ₃", P ₄", P ₅") be co-located on one the 4th position.

The reference numeral explanation:

10A, 10B～backlight assembly

10～backlight assembly

12,12a, 12b～blooming lamella

15,15b～framework

21～first side

22～second side

23,24～side

30～housing

120～blooming lamella

121,122,123,124 and 125～extension

121a, 122a, 123a, 124a and 125b～hole

151,152,153 and 154～groove

151a, 152a～projection

153a, 154a～barb

C ₀～central point

C _X, C _Y～central shaft

H ₁～the first perforation (restrictions)

H ₂～the second perforation

H ₃～the three perforation

H ₄～the four perforation

H ₅～the five perforation

H ₆～the six perforation

H ₁', H ₂', H ₃', H ₄', H ₅', H ₁", H ₂", H ₃", H ₄", H ₅"～perforation

G ₁, G ₂, G ₃, G _1Y, G _2Y, G _3X, G _3Y, G _4X, G _4Y, G _5X, G _5Y, G _6X, G _6Y～gap

P ₁～the first support

P ₂～the second support

P ₃～the three support

P ₄～the four support

P ₅～the five support

P ₆～the six support

P ₁', P ₂', P ₃', P ₄', P ₅', P ₁", P ₂", P ₃", P ₄", P ₅"～support

S ₁, S ₂～inwall

The rectangular coordinate of I-J-K～fixedly

X-Y-Z～turn to and the coordinate that changes system according to framework

P～anchor point

200～LCD

Embodiment

Fig. 2 A is the schematic perspective view of LCD 200 of the present invention, and Fig. 2 B is the sectional view of the line segment i-i direction in Fig. 2 A after dissecing.

The LCD 200 of square type shape comprises a housing 30 and a backlight assembly 10, and wherein, backlight assembly 10 is arranged in the housing 30.Backlight assembly 10 (for example: the symbol " P among Fig. 2 B comprises a framework 15, a plurality of blooming lamella 12 and at least one paired support ₁"), and each blooming lamella 12a (for example: the perforation " H among Fig. 2 B has at least one paired perforation ₁"), on Fig. 2 B, only present a perforation H who cooperatively interacts ₁With a support P ₁Following perforation H ₁Be restrictions, restriction support P ₁Mobile range, and the perforation H ₁Be provided with along the action of gravity direction of framework 15 with housing 30.

Support P ₁Can be made by transparent plastics, metal or other material.Support P ₁With perforation H with respect to blooming lamella 12 ₁The position protrude and to be arranged on the framework 15, and each blooming lamella 12a by support 15 by perforation H ₁Be arranged on the framework 15.It should be noted,, just no longer describe for panel or other associated component of LCD 200 at this because improvement of the present invention is the location structure and the mode thereof of the membrane layer 12 in the backlight assembly 10.

In Fig. 2 A, symbol " I-J-K " expression one is the rectangular coordinate system fixedly, and the main plane of LCD 200 is arranged in fixing rectangular coordinate unites on the planar I J of I-J-K, and the planar I J plane vertical with the action of gravity direction.Symbol " X-Y-Z " expression is united with respect to the fixing removable rectangular coordinate of rectangular coordinate system I-J-K, this removable rectangular coordinate system X-Y-Z is fixedly installed on the LCD 200, also be, removable rectangular coordinate system X-Y-Z follows LCD 200 and with moved further or rotation, wherein, coordinate axis X demonstrates the lengthwise bearing of trend on the long limit of blooming lamella 12 (or framework 15), the lengthwise bearing of trend of the broadside of coordinate axis Y blooming lamella 12 (or framework 15), coordinate axis Z demonstrates the perforation H of blooming lamella 12 ₁Or support P ₁Bearing of trend.

In following each embodiment and variation example, LCD 200 proposes explanation to be parallel to planar I-J among the fixing rectangular coordinate system I-J-K and the mode of rotating around coordinate axis K, and, in following each figure, only present a plurality of supports of the framework 15 in the LCD 200, the marriage relation between the membrane layer for making each embodiment be easier to understand.

[first embodiment]

3A, 3B figure are the diaphragm plane synoptic diagram of the first embodiment of the present invention, and wherein, Fig. 3 A shows the sectional view after basis is dissectd along the line segment ii-ii direction among Fig. 2 A, the figure the when structure among Fig. 3 B displayed map 3A is in another state.

The membrane layer that mutually combines 12 and a plurality of support P in Fig. 3 A ₁Be co-located on a primary importance, the membrane layer that mutually combines 12 and a plurality of support P in Fig. 3 B ₁Be co-located on a second place.Change speech, Y-axis on the blooming lamella 12 in Fig. 3 A is the constitutional diagram (primary importance is defined as the reference position of housing 30) of suspension along stationary coordinate J direction, the second place (Fig. 3 B) expression housing 30 is the constitutional diagram of suspension after around coordinate axis K Rotate 180 degree via primary importance (Fig. 3 A).

At first, second support P ₁, P ₂Pass oval-shaped first, second perforation H ₁, H ₂Effect under, blooming lamella 12 can be arranged on the framework 15 (with reference to figure 2B).In other preferred embodiment, a fluorescent tube support sector (not shown) also can be set on the framework 15, this fluorescent tube support sector extension protrudes from the framework 15, with supporting blooming lamella 12.

Blooming lamella 12 is for having a first side 21, a second side 22 and a central point C ₀Rectangular structure, wherein, first,

second side

21,22 is relative two long limits of blooming lamella 12, central point C ₀Be the geometric center of blooming lamella 12, orthogonal two central shaft C _X, C _YIntersect at central point C ₀, and central shaft C _YPassed through first, second support P ₁, P ₂First, second H that bores a hole ₁, H ₂With with respect to central point C ₀And symmetrical mutually, and first, second perforation H ₁, H ₂Be respectively adjacent in the position of first,

second side

21,22, also, be formed on the periphery of blooming lamella 12.Elliptoid first, second perforation H ₁, H ₂Major axis weigh in central shaft C _Y, and central shaft C _XBe axis of symmetry, also, the gravity direction that deadweight produced of blooming lamella 12 is along central shaft C _Y

When framework 15 is positioned at primary importance (Fig. 3 A), be adjacent to the first perforation H that mutually combines ₁, the first support P ₁ First side 21 be positioned at the upper limb position of blooming lamella 12, and be adjacent to mutually combine second the perforation H ₂, the second support P ₂Second side 22 be positioned at lower edge position for blooming lamella 12.Under the effect of the deadweight of blooming lamella 12, the first support P ₁Part is contacted with the first perforation H ₁Inwall S ₁, also, by the first support P ₁The contact first perforation H ₁So that membrane layer 12 reaches the location.

Symbol " G ₁" the expression first perforation H ₁Deduct the first support P ₁Last afterwards gap size, this gap size G ₁Room temperature, assembling tolerance and moulding tolerance are determined during by the thermal expansion coefficients of membrane layer 12, panel operation temperature, assembling.Same, symbol " G ₂, G ₃" the expression second perforation H ₂With the second support P ₂Between gap size, this gap size G ₂, G ₃Room temperature, assembling tolerance and moulding tolerance are determined during by the thermal expansion coefficients of membrane layer 12, panel operation temperature, assembling, by clearance G ₁, G ₂, G ₃Required cushion space when providing membrane layer 12 to expand with heat and contract with cold.

Because perforation H ₁, H ₂Elliptical shape restriction support P ₁, P ₂J and the moving range of I direction, when framework 15 is in primary importance, the first support P ₁Contact perforation H ₁With support membrane lamella 12, and the first perforation H ₁Limit the first support P ₁Move in that I is axial, make membrane layer 12 location and can't moving really at the I direction of principal axis.On the other hand, the second support P ₂Do not have supporting functions, with the second perforation H of membrane layer 12 ₂Between have the clearance G of Y direction ₂, therefore, do the time spent, because clearance G when membrane layer 12 expands with heat and contract with cold or is subjected to self gravitation ₂Scope greater than the second support P ₂, the second support P ₂Can not contact with membrane layer 12.In other words, the second support P ₂Can not touch the second perforation H of membrane layer 12 ₂, can prevent that stress from concentrating on the second support P ₂With the second perforation H ₂Between.Moreover, the clearance G of reservation ₁, G ₂Can make and to prevent the generation of ripple by evenly and freely rising-heat contracting-cold of membrane layer 12.

When rotating frame 15 during to the second place (Fig. 3 B), also, after framework Rotate 180 degree, at this moment, to be adjacent to the second perforation H ₂With the second support P ₂Second side 22 become and be upper limb, be adjacent to the first perforation H ₁With the first support P ₁ First side 21 become and be lower edge.Therefore, the second support P ₂Part is contacted with the second perforation H ₂Inwall S ₂With carrier film lamella 12.The second perforation H ₂Deduct the second support P ₂Last afterwards gap size during by the thermal expansion coefficients of membrane layer 12, panel operation temperature and assembling room temperature determined.Therefore, when being in the second place, the second support P is only arranged ₂ Support membrane lamella 12, and the second perforation H ₂To limit the second support P ₂Axial mobile at I, the first support P ₂Do not have supporting functions, and keep a clearance G between the membrane layer 12 ₁When expanding with heat and contract with cold, the clearance G of reservation ₁, G ₂Make and prevent that stress from concentrating on the first support P by evenly and freely rising-heat contracting-cold of membrane layer 12 ₁With the first perforation H ₁Between, can prevent the generation of ripple.

It should be noted the first support P of present embodiment ₁Be a projection, right cylinder or rectangular parallelepiped.The first perforation H ₁Shape except oval-shaped, also can circle, the rectangle or the polygon of rectangle, fillet.Same, the second support P ₂Be a projection, right cylinder or rectangular parallelepiped.The second perforation H ₂Rectangle that is shaped as circle, ellipse, rectangle, fillet or polygon.

First embodiment also has one and changes example, and this changes example and is applicable to large-scale LCD.When the LCD size is big more, the size of membrane layer 12a and framework 15 is also along with increase, and the quantity of the perforation of location usefulness and support determines according to the size of LCD.

In this variation example, be formed with three pairs of paired perforation on the membrane layer 12a, shown in Fig. 3 C.Also promptly, except the paired first perforation H of first embodiment ₁With the second perforation H ₂Outside, also comprise other two paired perforation on the membrane layer 12a of backlight assembly: paired the 3rd a perforation H ₃With the 4th perforation H ₄, be separately positioned on two adjacent on the side 23 of membrane layer 12a corners, and another the 5th paired perforation H ₅With the 6th perforation H ₆, be separately positioned on the two adjacent corners on the side 24 of membrane layer 12a.When LCD hangs from above in the primary importance mode, the perforation H of the side 21 of adjacent membrane lamella 12a ₃, H ₁, H ₅Be restrictions, in order to restriction and orientation film lamella 12a, at this moment, side 21 is the upper limb of membrane layer 12a, and perforation H ₄, H ₂, H ₆Be positioned at opposed side edges 22, just the lower edge of membrane layer 12a.As shown in the figure, perforation H ₃, H ₁, H ₅Respectively with perforation H ₄, H ₂, H ₆Central shaft C with directions X _XOn central point C ₀Be symmetrical arranged.

Framework 15 (not being shown among the figure) comprises three pairs of paired supports equally, and each support is extended by the fluorescent tube support sector (not being shown among the figure) on framework 15 or the framework 15.The first paired support P except first embodiment ₁With the second support P ₂Outside, also increase by other two paired supports: the 3rd, the 4th paired support P ₃, P ₄, pass the 3rd corresponding perforation H respectively ₃With the 4th perforation H ₄, and the 5th, the 6th paired support P ₅, P ₆, pass the 5th corresponding perforation H respectively ₅With the 6th perforation H ₆Support P ₁, P ₂, P ₃, P ₄, P ₅, P ₆Can be made by transparent plastic, metal or other material.

In this variation example, first, second H that bores a hole ₁, H ₂Be ellipse, and the the 3rd, the 4th, the 5th, with the 6th the perforation H ₃, H ₄, H ₅, H ₆Shape be different from first, second the perforation H ₁, H ₂, the the 3rd, the 4th, the 5th, with the 6th the perforation H ₃, H ₄, H ₅, H ₆Be shaped as rectangle with fillet.

It should be noted, the the 3rd, the 4th, the 5th, with the 6th the perforation H ₃, H ₄, H ₅, H ₆Shape also can with first embodiment first, second perforation H ₁, H ₂Identical or different.

This variation example limits the mobile range of support by the shape of boring a hole.Because perforation H ₁, H ₂Be ellipse, perforation H ₁, H ₂The length of minor axis less times greater than support P ₁, P ₂Diameter, make support P ₁, P ₂Can't move in the I direction, also, pass first, second perforation H ₁, H ₂First, second support P ₁, P ₂Be defined and move according to the J direction.

On the other hand, because the the 3rd, the 4th, the 5th, with the 6th support P ₃, P ₄, P ₅, P ₆Pass fillet rectangle the the 3rd, the 4th, the 5th, with the 6th the perforation H ₃, H ₄, H ₅, H ₆, the the 3rd, the 4th, the 5th, with the 6th support P ₃, P ₄, P ₅, P ₆Can I or J direction of principal axis the the 3rd, the 4th, the 5th, with the 6th perforation H ₃, H ₄, H ₅, H ₆Form range in move.Also promptly, when LCD hangs from above in the primary importance mode, the support P of upper limb is only arranged ₃, P ₁, P ₅Part is contacted with perforation H ₃, H ₁, H ₅Inwall S ₃, S ₁, S ₅, and then orientation film lamella 12a.

Moreover, each H that bores a hole ₁, H ₂, H ₃, H ₄, H ₅, H ₆With each support P ₁, P ₂, P ₃, P ₄, P ₅, P ₆Between have set clearance G _1Y, G _2Y, G _3X, G _3Y, G _4X, G _4Y, G _5X, G _5Y, G _6X, G _6YAbove-mentioned clearance G _1Y, G _2Y, G _3X, G _3Y, G _4X, G _4Y, G _5X, G _5Y, G _6X, G _6YSize during by the thermal expansion coefficients of membrane layer 12a, panel operation temperature and assembling room temperature determined.By finding out first, second support P on the figure ₁, P ₂Respectively according to the J direction in clearance G _1Y, G _2YInterior moving, and the 3rd, the 4th, the 5th, the 6th support P ₃, P ₄, P ₅, P ₆Mobile range respectively in clearance G _3X, G _3Y, G _4X, G _4Y, G _5X, G _5Y, G _6X, G _6YIn.

It should be noted, in the present embodiment, be positioned at the 3rd, the 5th support P of the dual-

side

23,24 of membrane layer 12a upper limb 1 ₃, P ₅The effect in gap and inequality.G _3XBe the heat of the X-direction of the membrane layer 12a headspace that rises, and G _3YBe the heat of the Y direction of the membrane layer 12a headspace that rises.On the other hand, G _5XBe the shrinkage headspace of the X-direction of membrane layer 12a, G _4YBe the shrinkage headspace of the Y direction of membrane layer 12a, anti-is as the same.Therefore, membrane layer 12a is to be positioned at the first support P of upper limb ₁Be the central supported point, membrane layer 12a can be down or toward the even and freely rising-heat contracting-cold of left and right directions, shown in the arrow of dotted line.

In order for example to need 180 to spend when being inverted (second place), because perforation is with central point C because of changing the needs of putting angle of LCD ₀Laterally zygomorphic design, so the location mechanism of membrane layer can not change because of rotation.After the inversion, second side 22 becomes upper limb, and the first routine limit 21 becomes lower edge, perforation H ₄, H ₂, H ₆Just become the perforation of location, supporting usefulness.Also promptly, when LCD hangs from above in second place mode, the support P of upper limb is only arranged ₄, P ₂, P ₆Part is contacted with perforation H ₄, H ₂, H ₆Inwall, all the other supports do not have supporting functions, make membrane layer be expanded with heat and contract with cold freely.

Total, above-mentioned paired perforation is formed on two relative corners on the membrane layer 12, adjacent two corners or opposed side edges with symmetric mode.Therefore, LCD of the present invention can be rotated between the 0-360 degree arbitrarily, can ripply problem not produce.

[second embodiment]

When Fig. 4 A～4D represents that respectively present embodiment is in first, second, third, fourth position, membrane layer 12b and each support P ₁', P ₂', P ₃', P ₄', P ₅', P ₁", P ₂", P ₃", P ₄", P ₅" the relative position synoptic diagram.Based on different occasions or demand, can carry out the putting of each angle of 0 degree, 90 degree, 180 degree, 270 degree by the second embodiment of the present invention for LCD.

Shown in Fig. 4 A, the perforation that first, second

relative side

21,22 of membrane layer 12b has three pairs of symmetries respectively: H ₁', H ₁"; H ₂', H ₂" and H ₃', H ₃".When LCD is in primary importance (0 degree), the support P on the framework (not shown) is only arranged ₁', P ₂', P ₃' part be contacted with the perforation H ₁', H ₂', H ₃' inwall with carrier film lamella 12b.

Shown in Fig. 4 B, the perforation that relative the 3rd, the four

side

24,4 of membrane layer 12b has two pairs of symmetries respectively: H ₄', H ₄" and H ₅', H ₅".When LCD is in the second place (revolved turn 90 degrees by primary importance), the support P on the framework (not shown) is only arranged ₄', P ₅' part be contacted with the perforation H ₄', H ₅' inwall with carrier film lamella 12b.

When LCD is in the 3rd position (by primary importance Rotate 180 degree), shown in Fig. 4 C, the support P on the framework (not shown) is only arranged ₁", P ₂", P ₃" part be contacted with the perforation H ₁", H ₂', H ₃' inwall with carrier film lamella 12b.

When LCD is in the 4th position (by primary importance rotation 270 degree), shown in Fig. 4 D, the support P on the framework (not shown) is only arranged ₄", P ₅" part be contacted with the perforation H ₄", H ₅" inwall with carrier film lamella 12b.

In order to simplify accompanying drawing, there is no between each perforation of special sign and the support the gap, only with G ₄' and G ₅' as representative.Yet, go up and can obviously find out by figure, except the perforation of above-mentioned support location usefulness, each bore a hole and each support between have X and Y direction the gap.And gap size during by the thermal expansion coefficients of membrane layer, panel operation temperature, assembling a plurality of parameters such as room temperature, assembling tolerance and moulding tolerance determined.Therefore, when conversion liquid crystal display put angle the time, this headspace allows support to move in perforation, prevents that perforation from contacting fully with support, and then prevents that stress is concentrated; Moreover the gap of reservation makes membrane layer 12b evenly and freely to expand with heat and contract with cold, and can prevent the generation of ripple.

Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; yet when can doing a little change and retouching, so being as the criterion of should claims scope being defined of protection scope of the present invention.

Claims

1. A backlight assembly, comprising:

a frame;

a first support portion, the first support portion is disposed on the frame;

a second support portion disposed on the frame; and

A diaphragm layer, the diaphragm layer includes a first restricting portion and a second restricting portion, the diaphragm layer passes through the first restricting portion and the second restricting portion respectively by means of the first supporting portion and the second supporting portion The restriction part is set on the frame;

Wherein, when the frame is in a first position, the first support part is in contact with the inner wall of the first restricting part to carry the membrane layer; when the frame is in a second position, the second support part contacting the inner wall of the second restricting part to bear the membrane layer.

2. The backlight assembly according to claim 1, wherein the first restricting portion is a perforation or a groove, and the second restricting portion is a perforation or a groove.

3. The backlight assembly as claimed in claim 1, wherein the first restricting portion and the second restricting portion are respectively formed on opposite sides of the film layer.

4. The backlight assembly as claimed in claim 1, wherein the first restricting portion and the second restricting portion are respectively formed on two opposite corners of the film layer.

5. The backlight assembly as claimed in claim 1, wherein the first restricting portion and the second restricting portion are respectively disposed at two adjacent corners of the film layer.

6. The backlight assembly as claimed in claim 1, wherein the first restricting portion and the second restricting portion are arranged symmetrically with respect to the center point of the film layer.

7. The backlight assembly as claimed in claim 1, wherein when the frame is at the second position, there is a first gap between the first supporting portion and the first restricting portion, and the first gap is the The reserved space when the diaphragm layer expands with heat and contracts with cold; when the frame is in the first position, there is a second gap between the second supporting part and the second restricting part, and the second gap is the diaphragm The reserved space when the layer heats up and contracts.

8. The backlight assembly according to claim 1, wherein the rotation angle from the first position to the second position is 90 degrees, 180 degrees or 270 degrees; when the frame is in the first position, the The movement range of the diaphragm layer perpendicular to the direction of gravity is limited by the first limiting part and the first supporting part, and the combination of the frame and the first supporting part restricts the diaphragm layer on the first supporting part The range of movement in the extending direction of the frame; when the frame is in the second position, the range of movement of the diaphragm layer perpendicular to the direction of gravity is limited by the second limiting portion and the second supporting portion, and the frame and The combination of the second supporting parts limits the moving range of the diaphragm layer in the extending direction of the second supporting parts.

9. The backlight assembly according to claim 1, wherein the first restricting portion is elliptical, and when the frame rotates to the first position or the second position, the major axis of the elliptical restricting portion The length of the short axis of the ellipse restricting part is arranged along the gravitational action direction of the frame to restrict the movable range of the first supporting part.

10. The backlight assembly as claimed in claim 1, wherein the frame further comprises a lamp support portion, and the first support portion and the second support portion extend from the lamp support portion toward the film layer.