CN103969893A - Separating device and direct-lit backlight module comprising same - Google Patents
Separating device and direct-lit backlight module comprising same Download PDFInfo
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- CN103969893A CN103969893A CN201410206595.6A CN201410206595A CN103969893A CN 103969893 A CN103969893 A CN 103969893A CN 201410206595 A CN201410206595 A CN 201410206595A CN 103969893 A CN103969893 A CN 103969893A
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- separating device
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Abstract
The invention provides a separating device and a direct-lit backlight module comprising the separating device. The direct-lit backlight module comprises a bottom plate, a plurality of backlight sources and an optical element panel. The backlight sources are located between the bottom plate and the optical element panel. The direct-lit backlight module further comprises multiple separating devices. Each separating device is arranged on the periphery of the corresponding backlight source and comprises a supporting pillar, a rotating motor and a partition sheet, wherein the supporting pillar is used for supporting the optical element panel; the rotating motor is located below the supporting pillar; the partition sheet is fixedly connected with the rotating motor; the rotating motor drives the partition sheet to rotate around the corresponding backlight source, and then an independent region is formed in cooperation with picture partitions of a liquid crystal display screen to enable the picture partitions to be lightened. Compared with the prior art, the direct-lit backlight module can eliminate a dark line between contact surfaces of an existing separating plate and the optical element panel, and can fuzz up the border between unnatural shadow lines emerging in an existing module and reduce light leakage.
Description
Technical field
The present invention relates to the direct type backlight module in a kind of liquid crystal display, relate in particular to a kind of separating device for this direct type backlight module.
Background technology
Liquid crystal display (Liquid Crystal Display, LCD) technology one is to being applied in the portable type electronic products such as mobile computer, mobile phone, digital camera, Video Camera, personal digital assistant (Personal DigitalAssistance, PDA).Except these small-sized portable products, recent large-sized liquid crystal panel manufacturing technology is also day by day ripe.For example, table liquid crystal display device replaces traditional cold cathode ray tube (Cathode Ray Tube, CRT) display screen just gradually.Wherein, liquid crystal panel (LCD panel) is the assembly of most critical in this field, but itself is not luminous, a backlight need to be set and just show.There is now multiple back light source technique, and in large-sized liquid crystal display product, often used the backlight of direct type backlight module (Bottom LightingModule) as liquid crystal panel.
In the prior art, in general, direct type backlight module comprises a subregion dividing plate, multiple backlight and an optical element plate.At this, subregion dividing plate is arranged between the base plate and optical element plate of backlight module, it comprises multiple grids, each grid surrounds an independently region corresponding to a backlight and by this backlight, thus, local dimming (local dimming) design can coordinate the picture of LCD screen to carry out subregion to light, and then improves the contrast of display frame.In addition, also can lay reflector plate or coating reflection top layer at the upper surface of base plate, thereby prevent the light loss that backlight sends, make light be reflexed to the optical element plate of backlight top.
But also there is many defects in above-mentioned direct type backlight module.For example, spacing when optical element plate contacts with subregion dividing plate is less, has under the situation that the dividing plate of certain wall thickness all lights at adjacent backlight, easily above dividing plate, produces concealed wire, affects display quality.In addition, if in adjacent backlight one in bright state and another during in dark state, the place contacting with optical element plate at subregion dividing plate also can produce factitious shadow line border.Moreover contacting between subregion dividing plate and optical element plate is face contact, in the time that relative displacement appears in subregion dividing plate and optical element plate, easily cause the surface of optical element plate by scratch.More disadvantageously, the disposing way that the shape of separation pattern can be partitioned dividing plate limits, once the putting position of dividing plate is fixed up, separate pattern determines thereupon, make the form of local dimming single, the positive impact of the change in pattern that cannot realize scanning backlight (backlight scanning) on improving picture contrast.
In view of this, how to design a kind of direct type backlight module of novelty, the especially separating device of direct type backlight module, effectively to improve or to eliminate above-mentioned defect and deficiency, is a person skilled problem urgently to be resolved hurrily in the industry.
Summary of the invention
For direct type backlight module existing above-mentioned defect in the time that local dimming designs of prior art, the invention provides a kind of direct type backlight module, this direct type backlight module comprises a kind of separating device of novelty, by this separating device capable of being combined go out multiple local dimming aspect or scan pattern backlight, and then improving picture contrast.
According to one aspect of the present invention, a kind of direct type backlight module is provided, comprise a base plate, multiple backlight and an optical element plate, described backlight is between described base plate and described optical element plate, wherein said direct type backlight module also comprises multiple separating devices, each separating device is arranged at corresponding backlight around, and this separating device comprises:
Support column is that point contacts with the lower surface of this optical element plate, in order to support described optical element plate;
Rotation motor, is positioned at the below of described support column; And
Subregion sheet, is fixedly connected with described rotation motor,
Wherein, described rotation motor drives described subregion sheet to be rotated around described backlight, thereby forms an isolated area, lights with the picture subregion that coordinates LCD screen.
In one embodiment, described separating device also comprises a fixed part, and described base plate also comprises a through hole, and described fixed part wears described through hole, makes described separating device be fixed on described base plate.
In one embodiment, this fixed part has a base and two snap fits integrally formed with described base, described base and described snap fit lay respectively at the relative both sides of described base plate, and the accommodation space that forms in described base and described snap fit of described base plate inlay card.
In one embodiment, described rotation motor is right cylinder, and described base is disk, and the diameter of described disk is greater than described cylindrical bottom surface diameter.
In one embodiment, described direct type backlight module also comprises a reflector plate, is positioned at the top of described base plate, and described reflector plate has an opening at the correspondence position of described through hole, and the fixed part of described separating device wears described opening and described through hole successively.
In one embodiment, described optical element plate is a diffuser plate.
In one embodiment, the surface separately of the support column of described separating device, rotation motor and subregion sheet is all coated with the material of high reflectance.
In one embodiment, described support column is cone or positive rectangular pyramid.
According to another aspect of the present invention, a kind of separating device for direct type backlight module is provided, this direct type backlight module comprises a base plate, multiple backlight and an optical element plate, described backlight is between described base plate and described optical element plate, wherein said separating device is arranged at corresponding backlight around, comprising:
Support column is that point contacts with the lower surface of this optical element plate, in order to support described optical element plate;
Rotation motor, is positioned at the below of described support column; And
Subregion sheet, is fixedly connected with described rotation motor,
Wherein, described rotation motor drives described subregion sheet to be rotated around described backlight, thereby forms an isolated area, lights with the picture subregion that coordinates LCD screen.
In one embodiment, described separating device also comprises a fixed part, and it has a base and two snap fits integrally formed with base, and described base plate also comprises a through hole.Described base and described snap fit lay respectively at the relative both sides of described base plate, described snap fit wears the through hole of described base plate, the accommodation space that described base plate inlay card is formed in described base and described snap fit, thus described separating device is fixed on to described base plate.
The direct type backlight module that adopts separating device of the present invention and comprise this separating device, its backlight is between base plate and optical element plate, each separating device is arranged at corresponding backlight around, this separating device comprises support column, rotation motor and subregion sheet, support column is that point contacts with the lower surface of optical element plate, rotation motor is positioned at the below of support column, subregion sheet is fixedly connected with rotation motor, thereby drive subregion sheet to form an isolated area around corresponding backlight rotation by rotation motor, light with the picture subregion that coordinates LCD screen, improving picture contrast.Than prior art, direct type backlight module of the present invention can be eliminated the concealed wire (darkline) of existing dividing plate and optical element plate surface of contact, and can obfuscation work as the unnatural shadow line border occurring in front module, reduces light leak situation.In addition, support column of the present invention and optical element plate, for a way of contact, therefore can avoid support column and optical element plate to occur relative displacement and then cause scratch.
Brief description of the drawings
Reader, after having read the specific embodiment of the present invention with reference to accompanying drawing, will become apparent various aspects of the present invention.Wherein,
Fig. 1 illustrates the structural representation of a kind of direct type backlight module of the prior art;
Fig. 2 A illustrates according to one embodiment of the present invention, for the structural representation of the separating device of direct type backlight module;
Fig. 2 B illustrates another view of the separating device of Fig. 2 A;
Fig. 3 illustrates when the separating device of Fig. 2 A is assembled to direct type backlight module, adjacent all schematic diagram in illuminating state of two backlights;
Fig. 4 illustrates when the separating device of Fig. 2 A is assembled to direct type backlight module, and two adjacent backlights are respectively in lighting and extinguish the schematic diagram of state;
Fig. 5 (a)～Fig. 5 (c) illustrates in the alternative embodiment of separating device of Fig. 2 A, utilizes difform subregion sheet rotation to carry out the schematic diagram of local dimming; And
Fig. 6 (a) and Fig. 6 (b) illustrate that direct type backlight module of the present invention forms the schematic diagram of different scan patterns backlight through the separating device of Fig. 2 A.
Embodiment
For the technology contents that the application is disclosed is more detailed and complete, can be with reference to accompanying drawing and following various specific embodiments of the present invention, in accompanying drawing, identical mark represents same or analogous assembly.But those of ordinary skill in the art should be appreciated that the embodiment that hereinafter provided is not used for limiting the scope that the present invention is contained.In addition, accompanying drawing, only for being schematically illustrated, is not drawn according to its life size.
With reference to the accompanying drawings, the embodiment of various aspects of the present invention is described in further detail.
Fig. 1 illustrates the structural representation of a kind of direct type backlight module of the prior art.With reference to Fig. 1, this direct type backlight module comprises a base plate 100, a separating device 102, one or more optical element plate 104.Multiple backlights (such as LED light source) 106 are arranged on base plate 100.Separating device 102 is between optical element plate 104 and base plate 100.For feasible region light modulation (localdimming), separating device 102 is divided into multiple grids, each grid is corresponding to some backlights 106, and these backlights 106 are surrounded to an independently region, lights thereby coordinate the picture of LCD screen to carry out subregion.
But existing direct type backlight module has significant limitation in the time of local dimming.This be because, separating device 102 often designs in advance, the shape that causes separating pattern is separated the disposing way of device 102 and restrains.Once the putting position of separating device 102 is fixed, separate pattern and determine thereupon.In addition, separating device 102 is the face way of contact with optical element plate 104, under the situation of all lighting, easily above the dividing plate of separating device 102, produces concealed wire at adjacent backlight 106.If two adjacent backlights in the time of bright state and dark state, also can form factitious shadow line border at their contact position respectively.
In order to solve above-mentioned defect of the prior art, the invention provides one separating device comparatively flexibly.Fig. 2 A illustrates according to one embodiment of the present invention, for the structural representation of the separating device of direct type backlight module.Fig. 2 B illustrates another view of the separating device of Fig. 2 A.
In conjunction with Fig. 2 A and Fig. 2 B, separating device of the present invention is suitable for realizing the multiple local dimming of combination in direct type backlight module.This separating device comprises a support column 302, a rotation motor 304 and a subregion sheet 306.This subregion sheet 306 is straight sheet, and has certain thickness.Wherein, support column 302 is that point contacts with the lower surface of the optical element plate of direct type backlight module, in order to support this optical element plate.Preferably, the surface separately of the support column 302 of separating device, rotation motor 304 and subregion sheet 306 is all coated with the material of high reflectance, in the time that the light of backlight outgoing arrives these parts of separating device, reflects on its surface.
In addition, support column 302 can be designed to cone or positive rectangular pyramid.For example, in the time that support column 302 is cone-shaped structure, the light of backlight outgoing cannot incide the contact portion of optical element plate and support column 302, therefore the end face that makes support column 302 tops contact with optical element plate has less tangent plane diameter, and this will contribute to reduce the situation that incident ray is covered on support column 302 tops undoubtedly.Also for the some way of contact, under the situation of all lighting, can't there is concealed wire with optical element plate at adjacent backlight in support column 302 just because of this, on optical element plate.In addition, even there is relative displacement between support column of the present invention 302 and optical element plate, owing to adopting some contact to replace existing the way of contact, thereby also can avoid occurring that optical element plate is by scratch.
Rotation motor 304 is positioned at the below of support column 302, can be rotated around corresponding backlight.Subregion sheet 306 is fixedly connected with rotation motor 304.Thus, when rotation motor 304 moves, can drive the subregion sheet 306 being fixedly connected with to be with it rotated around backlight, to form an isolated area, coordinate the picture subregion of LCD screen to light.
In one embodiment, separating device also comprises a fixed part.This fixed part has a base 308 and two snap fits 310 integrally formed with base 308, as shown in Figure 2 B.By this snap fit 310, separating device is fixed to the base plate of direct type backlight module.Below will be explained in detail.In addition, rotation motor 304 is right cylinder, and base 308 is disk, and the diameter of disk 308 is greater than the bottom surface diameter of right cylinder 304.
Fig. 3 illustrates when the separating device of Fig. 2 A is assembled to direct type backlight module, adjacent all schematic diagram in illuminating state of two backlights.Fig. 4 illustrates when the separating device of Fig. 2 A is assembled to direct type backlight module, and two adjacent backlights are respectively in lighting and extinguish the schematic diagram of state.
With reference to Fig. 3, this direct type backlight module comprises a base plate 303, multiple backlight (such as P1, P2) and an optical element plate 301.For example, optical element plate 301 is a diffuser plate (Diffuser).Backlight P1 is between base plate 303 and optical element plate 301.And this direct type backlight module also comprises multiple separating devices, for example, the separating device that backlight P1 is corresponding is placed in around it, and the separating device that backlight P2 is corresponding is also placed in around it.In this embodiment, backlight P1 and backlight P2 are all in illuminating state.Symbol d mark for the height of support column 302.
In Fig. 3, base plate 303 also comprises a through hole H.The base 308 of fixed part and snap fit 310 lay respectively at the relative both sides of base plate 303, that is base 308 is in upper surface one side of base plate 303, and snap fit 310 is in lower surface one side of base plate 303.Snap fit 310 wears the through hole H of base plate 303, the accommodation space that base plate 303 inlay cards are formed in base 308 and snap fit 310, thus separating device is fixed on to base plate 303.Preferably, this snap fit 310 can be made up of elastic material, and in the time that snap fit 310 passes through hole H, snap fit 310 is in elastic compression, and in the time that snap fit 310 passes and stretch out through hole H, snap fit 310 returns to again state of nature.
According to a specific embodiment, this direct type backlight module also comprises a reflector plate 305.Reflector plate 305 is positioned at the top of base plate 303, and its correspondence position at through hole H has an opening, and the fixed part of separating device wears opening and through hole H successively, thereby prevents the light generation loss of backlight P1 or P2 outgoing.
Similarly, in Fig. 4, backlight P1 in illuminating state and backlight P2 in extinguishing state.But, can find out from the travel path of backlight P1 emergent ray, a part of light reflects in optical element plate 301 inside, thus the top of entry of backlight source P2.Thus, direct type backlight module of the present invention can come the factitious shadow line of obfuscation border by separating device, reduces light leak situation.
Fig. 5 (a)～Fig. 5 (c) illustrates in the alternative embodiment of separating device of Fig. 2 A, utilizes difform subregion sheet 306 rotations to carry out the schematic diagram of local dimming.
In Fig. 5 (a), the cross sectional shape of subregion sheet is semicircle, in the time that rotation motor 304 drives 306 rotations of subregion sheet to a certain ad-hoc location, by the bright dark control of backlight separately, the effect that local dimming produces is, middle border circular areas is dark state, and the border circular areas of the left and right sides is bright state.And in Fig. 5 (b), the cross sectional shape of subregion sheet is the circular arc that is less than 180 degree, because the cross sectional shape of this subregion sheet changes, in the time that subregion sheet 306 follows rotation motor 304 to rotate, by the bright dark control of backlight separately, the effect that local dimming produces is adjusted into, and the elliptical region on left side, centre and right side is bright state.In addition, also the arc subregion sheet 306 in Fig. 5 (b) can be rotated a certain angle, and change the bright dark distribution of backlight separately, make the shape in the light modulation region of Fig. 5 (c) be different from the shape in the light modulation region of Fig. 5 (b).
Fig. 6 (a) and Fig. 6 (b) illustrate that direct type backlight module of the present invention forms the schematic diagram of different scan patterns backlight through the separating device of Fig. 2 A.
In addition, utilize the separating device of direct type backlight module of the present invention, also can realize different scan patterns backlight, and then improve the contrast of display frame.For example, in Fig. 6 (a), the bright state of backlight of diverse location and dark state are interspersed, and in Fig. 6 (b), and the bright dark state of backlight is according to the position of row or column and rule distributes.
The direct type backlight module that adopts separating device of the present invention and comprise this separating device, its backlight is between base plate and optical element plate, each separating device is arranged at corresponding backlight around, this separating device comprises support column, rotation motor and subregion sheet, support column is that point contacts with the lower surface of optical element plate, rotation motor is positioned at the below of support column, subregion sheet is fixedly connected with rotation motor, thereby drive subregion sheet to form an isolated area around corresponding backlight rotation by rotation motor, light with the picture subregion that coordinates LCD screen, improving picture contrast.Than prior art, direct type backlight module of the present invention can be eliminated the concealed wire (darkline) of existing dividing plate and optical element plate surface of contact, and can obfuscation work as the unnatural shadow line border occurring in front module, reduces light leak situation.In addition, support column of the present invention and optical element plate, for a way of contact, therefore can avoid support column and optical element plate to occur relative displacement and then cause scratch.
Above, describe the specific embodiment of the present invention with reference to the accompanying drawings.But those skilled in the art can understand, without departing from the spirit and scope of the present invention in the situation that, can also do various changes and replacement to the specific embodiment of the present invention.These changes and replacement all drop in the claims in the present invention book limited range.
Claims (10)
1. a direct type backlight module, comprise a base plate, multiple backlight and an optical element plate, described backlight is between described base plate and described optical element plate, it is characterized in that, described direct type backlight module also comprises multiple separating devices, each separating device is arranged at corresponding backlight around, and this separating device comprises:
Support column is that point contacts with the lower surface of this optical element plate, in order to support described optical element plate;
Rotation motor, is positioned at the below of described support column; And
Subregion sheet, is fixedly connected with described rotation motor,
Wherein, described rotation motor drives described subregion sheet to be rotated around described backlight, thereby forms an isolated area, lights with the picture subregion that coordinates LCD screen.
2. direct type backlight module according to claim 1, is characterized in that, described separating device also comprises a fixed part, and described base plate also comprises a through hole, and described fixed part wears described through hole, makes described separating device be fixed on described base plate.
3. direct type backlight module according to claim 2, it is characterized in that, this fixed part has a base and two snap fits integrally formed with described base, described base and described snap fit lay respectively at the relative both sides of described base plate, and the accommodation space that forms in described base and described snap fit of described base plate inlay card.
4. direct type backlight module according to claim 3, is characterized in that, described rotation motor is right cylinder, and described base is disk, and the diameter of described disk is greater than described cylindrical bottom surface diameter.
5. direct type backlight module according to claim 2, it is characterized in that, described direct type backlight module also comprises a reflector plate, be positioned at the top of described base plate, described reflector plate has an opening at the correspondence position of described through hole, and the fixed part of described separating device wears described opening and described through hole successively.
6. direct type backlight module according to claim 1, is characterized in that, described optical element plate is a diffuser plate.
7. direct type backlight module according to claim 1, is characterized in that, the surface separately of support column, rotation motor and the subregion sheet of described separating device is all coated with the material of high reflectance.
8. direct type backlight module according to claim 1, is characterized in that, described support column is cone or positive rectangular pyramid.
9. the separating device for direct type backlight module, this direct type backlight module comprises a base plate, multiple backlight and an optical element plate, described backlight is between described base plate and described optical element plate, it is characterized in that, described separating device is arranged at corresponding backlight around, comprising:
Support column is that point contacts with the lower surface of this optical element plate, in order to support described optical element plate;
Rotation motor, is positioned at the below of described support column; And
Subregion sheet, is fixedly connected with described rotation motor,
Wherein, described rotation motor drives described subregion sheet to be rotated around described backlight, thereby forms an isolated area, lights with the picture subregion that coordinates LCD screen.
10. the separating device for direct type backlight module according to claim 9, is characterized in that, described separating device also comprises a fixed part, and it has a base and two snap fits integrally formed with described base, and described base plate also comprises a through hole,
Wherein, described base and described snap fit lay respectively at the relative both sides of described base plate, described snap fit wears the through hole of described base plate, the accommodation space that described base plate inlay card is formed in described base and described snap fit, thus described separating device is fixed on to described base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410206595.6A CN103969893A (en) | 2014-05-15 | 2014-05-15 | Separating device and direct-lit backlight module comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410206595.6A CN103969893A (en) | 2014-05-15 | 2014-05-15 | Separating device and direct-lit backlight module comprising same |
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| Publication Number | Publication Date |
|---|---|
| CN103969893A true CN103969893A (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410206595.6A Pending CN103969893A (en) | 2014-05-15 | 2014-05-15 | Separating device and direct-lit backlight module comprising same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106873214A (en) * | 2015-11-30 | 2017-06-20 | 乐金显示有限公司 | Display device |
| CN109058912A (en) * | 2018-06-07 | 2018-12-21 | 伟志光电（深圳）有限公司 | A kind of straight-down negative multi-section display backlight |
-
2014
- 2014-05-15 CN CN201410206595.6A patent/CN103969893A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106873214A (en) * | 2015-11-30 | 2017-06-20 | 乐金显示有限公司 | Display device |
| CN109058912A (en) * | 2018-06-07 | 2018-12-21 | 伟志光电（深圳）有限公司 | A kind of straight-down negative multi-section display backlight |
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Application publication date: 20140806 |