CN1739050A - Optical film structure, illumination apparatus and liquid crystal display device - Google Patents

Optical film structure, illumination apparatus and liquid crystal display device Download PDF

Info

Publication number
CN1739050A
CN1739050A CNA2004800022024A CN200480002202A CN1739050A CN 1739050 A CN1739050 A CN 1739050A CN A2004800022024 A CNA2004800022024 A CN A2004800022024A CN 200480002202 A CN200480002202 A CN 200480002202A CN 1739050 A CN1739050 A CN 1739050A
Authority
CN
China
Prior art keywords
film
light
blooming
liquid crystal
lighting unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CNA2004800022024A
Other languages
Chinese (zh)
Other versions
CN100360974C (en
Inventor
田木朗
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Innovative Properties Co
Original Assignee
3M Innovative Properties Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3M Innovative Properties Co filed Critical 3M Innovative Properties Co
Publication of CN1739050A publication Critical patent/CN1739050A/en
Application granted granted Critical
Publication of CN100360974C publication Critical patent/CN100360974C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/007—Incandescent lamp or gas discharge lamp
    • G02B6/0071—Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/006—Filter holders
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Dispersion Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)
  • Mounting And Adjusting Of Optical Elements (AREA)

Abstract

The present invention provides an optical film structure useful in a liquid crystal display device and capable of using thin optical films without warp and distortion. An optical film structure comprises at least one optical film, at least four film fixing parts arranged at an outer peripheral portion of the optical film, a film tension controlling member fitted at one of the ends thereof to each of the film fixing parts in such a fashion as to be capable of pulling the optical film under tension while maintaining flatness of the optical film, and a film fixing frame to which the other end of the film tension controlling member is connected and which fixes the optical film.

Description

Optic film structure, ligthing paraphernalia and liquid crystal indicator
The present invention relates to a kind of optic film structure, a kind of ligthing paraphernalia and a kind of liquid crystal indicator.More specifically, the present invention relates to a kind of optic film structure, this structure combines with the lighting unit with at least one blooming and is advantageously used in the liquid crystal indicator, and ligthing paraphernalia and liquid crystal indicator respectively have this optic film structure.In according to liquid crystal indicator of the present invention, especially, a film tension force (film tension) control piece of the flexible piece of the periphery of blooming by comprising spring for example or rubber is installed on fixed frame.Therefore, owing to the distortion of heat with the aging blooming that produces can be absorbed, it is straight that this surface can keep, and therefore can prevent the decline of the display performance of liquid crystal indicator.
Background of invention
Liquid crystal indicator has thin thickness, in light weight, characteristics that power consumption is few.Therefore, at messaging device and vision facilities it is applied as display device widely.The example application of liquid crystal indicator comprises the display of mobile phone, video camera, digital camera, personal computer, television receiver, and other application scenario.
Now at the commercial liquid crystal indicator that obtains many types.Usually, liquid crystal indicator comprises the optical element with numerous characteristics, for example at the optical sheet and the blooming of ligthing paraphernalia front, so that transmit light and realize light from the ligthing paraphernalia at the rear that is arranged on liquid crystal indicator and display screen uniformly.
In the liquid crystal indicator that uses vertical-type (backlight) backlight system, ligthing paraphernalia is arranged on the rear surface of LCD panel.Ray cast to a diffuser plate from for example comprising the ligthing paraphernalia that is embedded in the many fluorescent tubes in the transparent resin is mapped to the rear surface of LCD panel by the diffusion light wire spoke of this diffuser plate transmission, so that uniform Luminance Distribution is provided.Contain thin SiO 2Particulate is used as diffuser plate with the acrylic resin plate with about 1.5 millimeters thickness.When this plate is thin, because the warpage and the unevenness of plate are difficult to obtain uniform Luminance Distribution.Along with the size of liquid crystal indicator has in recent years become bigger, the warpage of this plate and out-of-flatness become and more may take place, and the thickness that has for this reason increased diffuser plate self is to alleviate these problems.On the other hand, the weight increase that causes this plate by the thickness and the area of diffuser plate has become another problem.
For fear of the problem of the optical sheet of for example diffuser plate, proposed to use blooming, optical sheet etc. to replace optical sheet recently.For example, the known liquid crystal indicator that uses so-called " brightness improvement film " on the light guide plate side of back lighting is to improve the luminosity of LCD panel.In this liquid crystal indicator, the brightness improvement film (prismatic film (prismfilm)) with prism shape is set on the light output surface side of guided plate, improved power consumption one brightness transition efficient significantly.In this device, usually guided plate with light output surface facing surfaces on printing point-like photodiffusion material to obtain uniform light emission.Because dot pattern causes many bright spots, optical diffusion film is arranged between brightness improvement film and the guided plate, so that hidden dot pattern and elimination uneven brightness problem.
The liquid crystal indicator of the brightness improvement film beyond the above-described prismatic film of also known use.Liquid crystal indicator uses the reflective polarizer films with brightness improvement effect.Though can utilize this reflective polarizer films separately, be preferably the prismatic film of using in the combination, with further improvement brightness improvement effect.
The blooming of for example above-described brightness improvement film and reflective polarizer films is important for the optical design of liquid crystal indicator.But owing to increased the size of liquid crystal indicator in recent years, the warpage of film and distortion have become and may take place more.In order to address these problems, to have increased the thickness of blooming self or thicker sheet has been bonded in blooming.But the attenuation rate of transmitting light along with the thickness increase of blooming becomes higher, has produced new problem at this point, that is, the brightness improvement effect descends.
On the other hand, also known liquid crystal indicator with the back lighting that forms by stacked many optical diffusion films.In order to solve the problem of uneven brightness, adopt the method for the gross thickness that increases optical diffusion film usually.Because descend along with thickness increases the light transmission system, so surface brightness descends, thus in this liquid crystal indicator stacked many thin optical diffusion films, be used to improve the diffusion of transfer coefficient and optical diffusion film.
Yet, when adopting this overlapping method, produced that blooming quantity increases and work that one group of blooming the is assembled into liquid crystal indicator complicated problems that becomes.Usually adopt the method that this blooming is bonded to the back lighting main body or is screwed them with cementing agent with the assembling blooming, but this method need be paid nervous work.
At the commercial various bloomings that obtain having the diaphragm that is bonded in blooming, the damage that is caused to protect this film surface not rubbed etc.In order to assemble this blooming, must tear diaphragm layer by layer off, thereby strengthen work.And, also cause the problem that produces static and handle detritus.
In addition, when using optical diffusion film under stacked state as discussed above, the warpage of this film or the problem of distortion are inevitable.
Brief Description Of Drawings
Fig. 1 is the cut-open view that has shown according to the liquid crystal indicator of a preferred embodiment of the present invention.
Fig. 2 is the stereographic map that the lighting unit of liquid crystal indicator shown in Figure 1 is shown.
Fig. 3 is the planimetric map that illustrates according to the ligthing paraphernalia of a preferred embodiment of the present invention.
Fig. 4 is the cut-open view of the ligthing paraphernalia of line " IV-IV " intercepting in Fig. 3.
Fig. 5 is the cut-open view that is illustrated in the fixing means of the film Tension Control part in the ligthing paraphernalia shown in Figure 3.
Fig. 6 is the cut-open view of modification that the fixing means of film Tension Control part shown in Figure 5 is shown.
Fig. 7 is the amplification view that illustrates according near an optic film structure preferred embodiment of the present invention, film Tension Control part.
Fig. 8 is the amplification view that illustrates according near optic film structure another preferred embodiment of the present invention, film Tension Control part.
Fig. 9 illustrates the planimetric map that blooming is fixed in the fixing means of the film fixed frame in optic film structure according to the present invention.
Figure 10 illustrates the planimetric map that blooming is fixed in another fixing means of the film fixed frame in optic film structure according to the present invention.
Figure 11 illustrates the planimetric map of a fixing means again that blooming is fixed in the film fixed frame in optic film structure according to the present invention.
Figure 12 is the cut-open view of the optic film structure of line " XII-XII " intercepting along Figure 11.
Figure 13 is the cut-open view that the modification of blooming fixing means shown in Figure 12 is shown.
Figure 14 illustrates the planimetric map that blooming is fixed in another fixing means of the film fixed frame in the optic film structure according to of the present invention.
Figure 15 is the cut-open view of the optic film structure of line " XV-XV " intercepting along Figure 14.
Figure 16 illustrates the planimetric map that the blooming fixing means shown in Figure 14 and 15 is applied to the example in a bight.
Brief summary of the invention
According to an aspect of of the present present invention, provide a light that is arranged on a lighting unit to transmit a lip-deep optic film structure, be used to modulate from the light of lighting unit emission and the light of the modulated mistake of projection, this structure comprises at least one blooming; At least four blooming fixtures that are provided with at the peripheral part of this blooming; One film Tension Control part, its a wherein end is connected in each film fixture in such mode,, keeps the flatness of blooming when can holding blooming under tension force that is; And a film fixed frame is used for fixing the blooming of the other end that is connected to film Tension Control part; Wherein, blooming, film Tension Control part and film fixed frame become one mutually and are configured a member.
According to another aspect of the present invention, a ligthing paraphernalia that comprises a lighting unit is provided, this lighting unit comprises at least: at least one light source and the light transmission surface that is used for guiding outwardly from the light of light source; And the light that is arranged on lighting unit transmits on the surface, according to an optic film structure of the present invention.
According to another aspect of the present invention, a liquid crystal indicator that comprises a lighting unit is provided, this lighting unit comprises at least one light source and the light transmission surface that is used for guiding from the light of light source at least outwardly;
The light that is arranged on lighting unit according to optic film structure of the present invention transmits on the surface; And, on the optic film structure that liquid crystal indicator is provided with.
Detailed description of the present invention
Below with detailed preferred embodiment of the present invention.But, should notice that the present invention is in no way limited to following examples.
In practice of the present invention, as long as will according to optical film structure of the present invention in its lighting unit, not be confined to LCD particularly.Therefore, comprise according to LCD of the present invention:
Lighting unit with at least one light source, this lighting unit have the light that is used to guide from light source and transmit the surface to outside at least one light;
Transmit a lip-deep optic film structure according to this light of the present invention, that be arranged on lighting unit; And
Be arranged on the liquid crystal display on this optic film structure.
Lighting unit and liquid crystal mesogens display unit can be respectively the well-known types in this technical field.
Liquid crystal indicator can be categorized as transmission type liquid-crystal apparatus and reflection-type or half transmission type liquid crystal indicator according to illuminator.By producing most of characteristic of respective type, can suitably use these liquid crystal indicators.Because the present invention has represented fabulous work and the effect aspect the optic film structure that is adopted in the time of in optic film structure is built into liquid crystal indicator, so the present invention can suitably provide bigger transmission type liquid crystal indicator.
Transmission type liquid crystal indicator comprises a liquid crystal display, and this unit has a pair of transparent matrix that wherein is gripped with liquid crystal.One ligthing paraphernalia promptly as the what is called " backlight illuminating unit " of a rear surface light source, is arranged on the back of liquid crystal display.When circuit is connected in the back lighting in the liquid crystal indicator in this type, can see the image that shows at liquid crystal board from the front surface of this plate.Use for example lamp of cold cathode fluorescent tube for back lighting.In this transmission type liquid crystal indicator, the major part of back lighting consumed power.For this reason, back lighting must keep electric on-state.Therefore, this back lighting is widely used in the desk-top and notebook-PC that it is easy to apply power supply.
Especially, in using the transmission type liquid-crystal apparatus of back lighting, usually by polariscope and by linear polarization, show so that can produce by the light of polarization like this from the light that is arranged on LCD plate backlight emission behind.Because common backlight be the light that is not polarized, use polariscope to obtain linear polarized light usually.But, surpass 50% in this employed polariscopic light absorption.In order to reduce this absorption and to obtain bright screen, need to increase the illumination of light fixture.In order to satisfy the requirement that improves illumination, for example, can use the light source that has increased luminous power, power consumption increases and the more problem of generating heat again but produced in this case.For the above especially in the portable set of for example notebook-PC this problem especially serious, must take the measure that tackles.Therefore, battery serviceable life has been shortened in the increase of power consumption, and heating increases and causes the decline in reliability and serviceable life.
Also have another reason to make and be difficult to increase illumination.In order to satisfy the requirement of saving power and space, reduced the diameter of lamp, used to reducing the wedge shape guided plate of thickness and weight.Structure according to the light guiding piece of this type is difficult to increase simultaneously illumination.Because the shape of member is less and complicated in this class guided plate, be another difficult problem so produced manipulation and assembled.
In order to solve problem and other optical problem that increases illumination, according to the blooming of liquid crystal indicator employing of the present invention on rear surface on the front surface of backlight illuminating unit or that in other words be liquid crystal display, and by using the film fixed system that this blooming is fixed in the liquid crystal indicator, this system comprises the combination of (1) film fixture, (2) film Tension Control part and (3) the film fixed frame that will describe in detail as the back.
The present invention especially can be assembled to lighting unit to constitute ligthing paraphernalia with at least one blooming by utilizing according to specific film fixed system of the present invention under the tension force effect.Therefore, liquid crystal indicator can provide the following remarkable advantage that back for example will be further explained in detail:
(1) can use over out of use, as to have big illumination improvement effect film and can obtain to have the membrane structure of higher illuminance improvement effect now for the large scale liquid crystal display device.
(2) can irrespectively use over for large scale with for that use, that the have the higher illuminance improvement effect separately film of medium size with size now, and, the membrane structure (combination of all bloomings) with big degree of freedom can be provided.
(3) because use optical diffusion film to replace the polypropylene diffuser plate, thus the diffusion layer of the nothing distortion of all sizes can be provided, can also weight reduction.
(4) because can so can simplify the step of back and it is raised the efficiency, can also cancel diaphragm in conjunction with a plurality of bloomings.
In practice of the present invention, specifically restriction is not used to form the blooming of optic film structure, but can at random use blooming according to desired optical characteristics in illumination of the present invention and LCD.In this case, can be individually or two or more film combination in any ground use blooming.The suitable example of blooming but be not restrictive, comprise have light diffusing can film (hereinafter referred to as " optical diffusion film "), have light reflective properties film (hereinafter referred to as " optical reflection film "), have the film of illumination improvement effect (hereinafter referred to as " illumination improvement film ", the film (hereinafter referred to as " multifunctional membrane ") of combination that has the film (hereinafter referred to as " polarizing coating ") of polarization property and have two or more performances of these bloomings.
Can use one or two or the combination of these bloomings more than two, for example as the lighting unit that is used for liquid crystal indicator, preferably be in optic film structure between backlight illuminating unit and the liquid crystal display, on the former.
Single layer structure (utilizing a blooming):
When utilizing a blooming to constitute optic film structure, the multifunctional optical film that can use optical diffusion film, illumination to improve film (for example prismatic film), polarizing coating (for example reflective polarizing film) or composite membrane or have two or more functions in these films.
When using the lighting unit that adopts the light guiding piece, for example, when the light diffusing surface for lighting unit makes with the light guiding piece in combination, can use optical diffusion film or optical diffusion film and illumination to improve the composite membrane of film.The vertical-type backlight illuminating unit that is equipped with the light guiding piece of polypropylene diffuser plate formation on its light diffusing surface is the typical example of this lighting unit.By the way, when not having the polypropylene diffuser plate in this lighting unit, blooming is restricted to optical diffusion film or its composite membrane.
Double-decker (utilizing two bloomings):
When utilized in combination constituted optic film structure with two bloomings, the blooming that can use the blooming that is similar to above-described single layer structure was as the film on the lighting unit side.Film on the liquid crystal display side can be that optical diffusion film, illumination are improved film (for example prismatic film), polarizing coating (for example reflective polarizing film) or its composite membrane.
Three-decker (utilizing three bloomings):
When utilized in combination constitutes optic film structure with three bloomings, can use the blooming that is similar to employed blooming in single layer structure as the blooming on the lighting unit side.Intermediate coat can be that optical diffusion film, illumination are improved film (for example prismatic film), polarizing coating (for example, reflective polarizing film) or its composite membrane.Also can use these films as the film on the liquid crystal display side.But when intermediate coat used the reflective polarizing film, the film on the liquid crystal display side used optical diffusion film.The optical diffusion film that uses in this situation is restricted to such optical diffusion film, and they do not damage (deflection) to the phase place of the light that the reflective polarizing film that is used as intermediate coat is reflected.For this reason, on the reflective polarizing film, can not use the prismatic film of the phase place that will damage the light that is deflected.
Sandwich construction (utilizing four or more blooming):
Can utilized in combination constitute optic film structure with four or more blooming.At this, can use and the above film combination like the composite class of three-decker.Below be several four-layer structure combinations, restrictive anything but certainly.
(1) optical diffusion film of enumerating in proper order from the lighting unit side, optical diffusion film, prismatic film and prismatic film.
(2) optical diffusion film of enumerating in proper order from the lighting unit side, prismatic film, prismatic film and optical diffusion film.
(3) optical diffusion film of enumerating in proper order from the lighting unit side, prismatic film, prismatic film and reflective polarizing film.
(4) optical diffusion film of enumerating in proper order from the lighting unit side, prismatic mould, reflective polarizing film and optical diffusion film.
Though at this combination of structure more than five layers or five layers is not described, can be in the layer combination of using in combination on the basis of above-described same concept more than five layers or five layers.
Under the situation of the vertical-type backlight illuminating unit that does not have the polypropylene diffuser plate, can use the combination of optical diffusion film, optical diffusion film, prismatic film and the reflective polarizing film enumerated in proper order from the lighting unit side, perhaps the optical diffusion film of enumerating in proper order from the lighting unit side, optical diffusion film, optical diffusion film, prismatic film and reflective polarizing film.
In combinations thereof, can also use composite membrane or multifunctional membrane.Under the situation of vertical-type lighting unit, size is bigger.Therefore, can advantageously use by the reflective polarizing film being provided diffusion and the rigidity composite membrane that (film that obtains by two surfaces that optical diffusion film are bonded in the reflective polarizing film) obtains.
When using two or more blooming, can between them, have the stacked blooming in gap or ground very close to each other with stacked or stacked state.Usually preferably between them, have less stacked with gap blooming and they are fixed in the film fixed frame.At this, can in broad range, change gap between blooming according to optical system required in the optic film structure, but usually in about 0.3 to 2.0 millimeter scope, preferably in about 0.5 to 1.0 millimeter scope.
To further explain employed each blooming in the present invention's practice.
Optical diffusion film normally has the film that thin polymer film is applied the diffusing surface processing (diffusion suface treatment) of hair side processing or embossed.Can also use other diffusing surface to handle, as blasting treatment or many tiny projectioies are set from the teeth outwards.And, can disperse for example TiO by inside 2The diffusion particulate form the light diffusing surface.
Can form optical diffusion film according to many method of moulding from the composition that contains polycarbonate resin, acrylic resin, vibrin, epoxy resin, urethane resin, polyamide, polyolefin resin, silicones (comprising for example improvement silicone of silicone polyureas) etc.The object lesson of optical diffusion film comprises the product of optical diffusion film " Opals series ", Keiwa company.
Can use the optical diffusion film of any thickness according to application target, but should select with the thickness that reduces liquid crystal indicator and the mode of weight usually.Therefore, the thickness of optical diffusion film is usually in about 5 to 1,000 micrometer ranges, preferably in about 5 to 500 microns scope, further preferably in about 5 to 200 microns scope.The thickness of optical diffusion film is best in about 5 to 150 microns scope.
Usually the illumination in this technical field is improved film and can be used as this illumination improvement film.It is that the illumination with a prism shape is improved film (prismatic film) that typical illumination is improved film.The object lesson that can be used in the prismatic film in the present invention's practice comprises the product of illumination improvement film " BEF II series ", " BE III is precious ", " RBEF series " and " NBEF series " (trade (brand) name), 3M company.
Can also adopt the illumination of any thickness to improve film according to application target.Usually should select illumination to improve the thickness of film in the mode of the size that reduces liquid crystal indicator and weight, illumination is improved the thickness of film usually about 5 to 1, in 000 micron the scope, preferably in about 5 to 500 microns scope, further preferably in about 5 to 200 microns scope.
Film with reflective polarizing performance can be used for illumination and improve film.The reflective polarizing film normally can be parallel to the direction of vibration transmission elder generation line of axis in the plane (in-plane axis) (transmission axis) but can reflect the polarizing coating of other light with one.In other words, this film only is transmitted into the light component in the direction of vibration that is parallel to above-mentioned transmission axis in the light that injects polarizing coating, has shown polarization work.But unlike the light absorption type polarization plates of prior art, the light that does not see through polarizing coating is not polarized film basically and absorbs.Therefore, can be returned to light source side in case be polarized the light of film reflection, and, can be set at the reflecting element on the light source side again, for example optical reflection film is advanced towards the reflective polarizing film.In the light that is returned like this, only to be transmitted at the light component that is parallel to the direction of vibration that transmits axis, remaining is reflected once more.The repetition of this transmission-reflective operation can increase the polarization light intensity that is transmitted.The object lesson of this reflective polarizing film is the product of " DBEF series " and " DRPF-H series " (trade (brand) name), 3M company.Can use round polarizer to replace this linearity polarizer.An example of the polarizer of circle is commercial courage steroid (Cholesteric) type circular polarization element from the available trade mark of Nitto Denko K.K " Nipocs " by name.
Also can use the reflective polarizing film of any thickness according to application target.Usually should select the thickness of reflective polarizing film so that reduce the size and the weight of liquid crystal indicator, this thickness is usually about 15 to 1, in 000 micron the scope, preferably in about 30 to 500 microns scope, further preferably in about 50 to 200 microns scope.
For practice of the present invention is that useful above concrete described blooming and other blooming can be to use with arbitrary shape and arbitrary dimension with the same way as of their thickness.For example, blooming can have the arbitrary shape that comprises circle, ellipse, polygon etc., but has rectangle (square or rectangle) usually and preferably.The area of this blooming comprises that than small size to than large tracts of land, this depends on the application target of optic film structure, usually in about 1 square centimeter to 2.0 square metres scope.In practice of the present invention, when the blooming area has shown its most effective work when being big with the film fixed system of combination of optical films use.Therefore, can prevent that film from deforming and warpage, keep the flatness on film surface simultaneously.So, recommend to use to have the larger area blooming.The area of the blooming that for example, use in the present invention, combines with the preferable screen size of LCD TV unit usually from about 15 to 20 inches or more than.Under the situation of this large screen television unit, rectilinear backlight illuminating unit is used as its lighting unit usually.When using optic film structure on backlight illuminating unit, for example the shortcoming of the distortion of the inhomogeneous diffusion of light, film and warpage etc. can not take place.The present inventor has confirmed that blooming has shown fabulous effect in the television unit that has near 37 inches screen size.
The use of blooming will further be specifically described.In according to liquid crystal indicator of the present invention, the light that polarizing coating can be provided in backlight illuminating unit penetrates the blooming on the surface (light transmits the surface).Can utilize the reflective polarizing film to replace polarizing coating.The reflective polarizing film is the linear pattern polarizer of reflection multilayer polarizing coating (for example, " DBEF series " (trade (brand) name)) and individual layer scattered reflection polarizing coating (for example, " DRPF-H series " (trade (brand) name)) for example.Much less, the common beam reflection element that when needs, can utilize illumination for example to improve film (for example, " BEF system " (trade (brand) name)) replace this linear pattern polarizer or with its combination.In according to liquid crystal indicator of the present invention, utilize the combination of polarizing coating or polarizing coating and light reflection element, be used for the back lighting utensil, these films are fixed in the film fixed frame according to film fixed system of the present invention.Therefore, the present invention can be provided at light utilization ratio aspect thin polarized light source splendid and that do not have the film fixation problem.Perhaps, polarizing coating can be the circular polarization element and can be the cholesteric circular polarization element that can obtain from NittoDenko K.K, with " Nipocs " trade (brand) name commercial.
Specifically, for example the polarizing coating of DBEF and DRPF-H transmits P polarized light and reflection S polarized light.Fan She S polarized light repeated multiple times reflection between near the light reflection element that is provided with the guided plate of lighting unit and the guided plate even so, but whenever the transmission of S polarized light has just been eliminated polarization by diffuser plate.Therefore, a part of S polarized light is converted into the P polarized light and is used effectively once more and polarizing coating is passed through in transmission.When laminated reflective film is used as light reflection element related with guided plate during this multiple reflection, can make because the optical attenuation that reflection produces is minimum and polarizing coating can be worked effectively.
DBEF that uses as polarizing coating and DRPF-H have in the prior art owing to certain reason gives the heat of this film or problem on deformation and because the even problem of uneven illumination that the film distortion is produced that other factors causes.But when using, can avoid this class problem according to film fixed system of the present invention.
When utilizing DRPF-H and other polarizing coating to replace DBEF, because DRPF-H launches white reflected light and has single layer structure, so can provide only emission not have the polarized light source of the P polarized light of look inhomogeneous and colour developing.
Preferably, provide the blooming of above detailed description with the form of optic film structure, this optic film structure is combined with (1) film fixture, (2) film Tension Control part and (3) film fixed frame.Can advantageously use the member and work and the effect that can fully show it of this optic film structure as the ligthing paraphernalia that is used for liquid crystal indicator.
Comprise according to optic film structure of the present invention:
Above-mentioned at least one blooming;
Be separately positioned at least four film fixtures of the peripheral part of blooming;
Be connected in the film Tension Control part of each film fixture in such mode, promptly a wherein end of this part can be connected in the film fixture with drawing under the tension force effect, keeps the flatness of blooming simultaneously; And
The film fixed frame that is used for fixing blooming, the other end of film Tension Control part is connected in the film fixed frame.
In this optic film structure, it is a member that blooming, film Tension Control part and preferable the mutually combining of film fixed frame are integral.
The film fixture is used as the structure that is used for film is fixed in the film fixed frame according to optic film structure of the present invention.The requirement of film fixture is assemblied in the peripheral part of blooming usually in this way modestly, does not promptly hinder the opticpath of blooming.Specifically do not limit the quantity of fixture and their rigging position.But, using four fixtures usually at least, these four fixtures must be assemblied in four angles of blooming.When the blooming size becomes big, can be to increase the quantity of film fixture corresponding to the increase mode of this size.When each blooming was used a large amount of film fixtures, the film fixture was installed in the appropriate location that is recommended in blooming, considers balance simultaneously, so that blooming is under the tension force effect, does not cause loose and warpage again.
Can be by for example molded, casting and mach job operation by many made film fixtures.Be used for the suitable example of the material of film fixture, but be not restrictive, comprise for example resin material of acrylic resin, for example aluminium and stainless metal material and other material.Can use these film fixtures in a variety of forms, as much as possible little but size is preferably.Therefore, the film fixture is preferably the smallclothes with brachmorphy or other shape.
The film fixture can be installed on one of them surface of the peripheral part of blooming.When the installation of the maintenance of blooming and film Tension Control part is still unstable, the film fixture can be installed on two surfaces of blooming.For being installed, the film fixture can use many fixing meanss.Usual way is to use cementing agent.Can use the polypropylene type cementing agent or the molten type cementing agent of urine that have separately than high bond strength.Can use the method for punching press, assembling, pushing cooperation etc. replace cementing agent or with the combination of cementing agent.For example, prepare U-shaped film fixture, the end of blooming is inserted in the gap that is in central authorities, to film and the pressurization of film fixture, become the integral body that the film fixture combines with blooming then.
Again film Tension Control part is installed on the film fixture of blooming.Film Tension Control part is a longitudinally elongated part in addition normally, and an end of this part is installed on as each above-mentioned film fixture.Blooming must be held under under the tension force effect at least, keeps its flatness simultaneously, this film Tension Control part is installed on the blooming film fixture of blooming (or be installed on) for this reason.Saving under the situation of this step, will the warpage and the problem on deformation of blooming take place.
Can form film Tension Control part by many materials, but preferably form by flexible material.Film Tension Control part can use many flexible materials.But, can advantageously use for example viscoelasticity tinsel material, piano wire, rubber and other tinsel material of spring usually.Film Tension Control part can directly be installed on the film fixture or be installed on the film fixture indirectly by for example syndeton wiry.
When the film Tension Control part with wire form is installed on the film fixture, in the surface of film fixture, form in advance the tinsel material and can be assemblied in wherein V-type groove, after tinsel material embedding V-type groove by the fixing film Tension Control part of cementing agent.Advantageously, the V-shaped groove side of film fixture is contacted with blooming and bond both, thereby film Tension Control part can be firmly fixed at the film fixture by cementing agent.
Also piano wire can be arranged on the precalculated position of film fixture, apply tension force by screw retention or similar structures simultaneously.In this case, the company of twining and fixedly be mounted the tinsel that the pair of films fixture is a syndeton.The piano wire part that is applied with tension force can play the effect of film Tension Control part.
The other end of film Tension Control part is connected in the film fixed frame, and the result makes blooming be fixed in this film fixed frame.Usually the mode with the peripheral part that centers on forms the shape of film fixed frame and can form this framework by many materials.The suitable example of film fixed frame, but be not restrictive, comprise for example material of acrylic resin, polycarbonate resin, for example metal material of aluminium, stainless steel or steel etc.Be preferably and utilize lightweight material.
The film fixed frame preferably has fully high physical strength except it in light weight.Therefore, in order to produce the film fixed frame, preferably reduce thickness as far as possible, but need proof strength.In other words, recommend to the increase of film fixed frame for example rib the enhancing part or adopt double-walled construction for wall part.When needed, think that the part of the film fixed frame of not gaining in strength can be cut.Can use in for example molded, casting, machine work or the similar approach any to form film fixed frame.When and cast metal material for example crooked by metal material form the film fixed frame, can obtain to have the film fixed frame of rigid structure.Can only produce fixed frame in addition and fixed frame can be assembled in the liquid crystal indicator then, the frame part of casting that can also utilize the Lights section that is used to hold liquid crystal indicator is as fixed frame.
Can film Tension Control part be connected in the film fixed frame according to many methods.For example, as mentioned above, can piano wire be installed on the film fixed frame by welding, bonding or similar approach.When film Tension Control part is screw or spring, can this film Tension Control part be installed on the film fixed frame by welding or screw retention.Can also form pin or other projection that encloses and will be formed in advance the film fixed frame in advance in the end of film Tension Control part hooks in this circle.
Preferably, use, simultaneously this optic film structure is arranged on the light transmission surface that consists essentially of at least one light source and be used for transmitting from the light of the light of light source the lighting unit on surface towards guided outside according to optic film structure of the present invention.In this case, the invention provides ligthing paraphernalia.According to a further aspect, when optic film structure is used between liquid crystal display and the lighting unit, the invention provides liquid crystal indicator.All specifically do not limited for the lighting unit of ligthing paraphernalia, the lighting unit and the liquid crystal display of liquid crystal indicator.As from following be described in detail will appreciate that, can use traditional lighting unit and traditional liquid crystal display as this lighting unit and liquid crystal display, after perhaps they are revised in any way as this lighting unit and liquid crystal display.
In according to equipment shown in the present, lighting unit comprises at least one light source and the light transmission surface that is used for guiding from the light of this light source outwardly.At this, lighting unit is preferably edge light (edge light) type backlight illuminating unit or vertical-type backlight illuminating unit.When using ligthing paraphernalia for 20 inches or above large-screen lc display device, the vertical-type backlight illuminating unit is especially preferable.
The edge-light type backlight illuminating unit preferably comprises following ingredient, for example:
(1) at least one light source,
(2) have a smooth guiding piece of a first type surface, it is used for guiding incident to pass through the light of a side outwardly with basic illumination uniformly, and has near a light source this side surface; And
(3) light reflection element that is formed by insulating material (light reflection element), it is configured to around light source and the light approaching side surface that can guide from light source.
At one or more light sources that only wherein can be provided as first ingredient on the side of light guiding piece, the light guiding piece is generally rectangle, as common use in the ligthing paraphernalia of for example backlight and preceding light (front light) utensil.Perhaps, on the opposite side surfaces of light guiding piece, one or more light sources can be set.Sometimes can on whole four sides of light guiding piece, light source be set.
In practice of the present invention, can use to have different size and difform many kinds of light sources.But, when consider using ligthing paraphernalia, can advantageously use rectilinear light source, the especially cold cathode ray tube of fluorescent light for example or the point source of light of light emitting diode (LED) for example as the lighting device of for example display device of liquid crystal mesogens display device.Especially when using point source of light, the light source that sufficient amount is set of on the side surface of light guide member, embarking on journey, so that realize required illumination, shaft-like smooth guiding piece (for example glass bar) perhaps is set on the side surface of light guide member, at the two ends of light guiding piece light source is set simultaneously.The example of available light source comprises but is not restricted to hot cathode ray tube and electroluminescence (EL) device except cold cathode ray tube and LED.When needed, can also use dissimilar light sources in combination.
Light guiding piece as second ingredient is generally rectangle and can advantageously be used with the form of guided plate.The light guiding piece can be as being wedge shape and be used as the wedge shape guided plate in this technical field employed usually.When using the wedge shape guided plate, the quantity of light source can only be one and make the guided plate shaping by this way, promptly near the side surface the light source to the opposite side surfaces reduced thickness.
When using according to ligthing paraphernalia of the present invention, be preferably at the light of light guiding piece and draw sloping portion that forms serrate projections, step or groove on the surface and the light of injecting sloping portion towards another apparent surface (basal surface) as the back lighting in reflection-type or the half transmission type liquid crystal indicator.
As long as they do not produce deleterious effect on light guiding effect, can adopt any material for the light guiding piece.But, when considering processing characteristics, can use for example many plastic materials of acrylic resin, polycarbonate resin, polyolefin resin, epoxy resin and polystyrene resin.When needed, for example can using, the inorganic material of glass replaces these plastic materials.
The 3rd ingredient is the light reflection element that is configured to around the light source use.As long as it can allow to inject effectively in the side surface of light guiding piece from the light of light source, light reflection element can have Any shape.But when considering compactedness and molded performance, preferably light reflection element is semicircular cylinder shape or flute profile.Therefore, can use light reflection element with the form of lamp reflection advantageously in the mode identical with prior art.By the way, when forming lamp reflecting body (lamp reflector), advantageously use the reflectance coating that insulating material forms and do not comprise metal ingredient basically, do not have aluminium vacuum evaporating film or silver-colored vacuum evaporating film in the lamp reflecting body that is used in prior art.Because this reflectance coating has insulating property, so it does not have the problem of the film acceptance of prior art from the leakage current of light source, and because this film does not reduce illumination intensity of light source basically.Reflectance coating is preferably by forming from the insulating material that the light of light source enters the side surface of light guiding piece with the guiding of at least 98% reflection coefficient.
Preferably, the reflectance coating as light reflection element is formed by laminated reflective film usually.Laminated reflective film for example is the multi-layer film-folding of polyethylene terephthalate (PEN) and its multipolymer (coPEN) or the multi-layer film-folding of PEN and syndiotactic polytyrene (sPS).When having self support property, it can use this laminated reflective film by suitable shape.Perhaps, prepare the suitable support that forms in the shape that enters reflecting body, reflectance coating can bond or be stacked on the inboard of support.The bonding of laminated reflective film or the stacked adhesive tape that can utilize cementing agent or two sides cladding.
As mentioned above, can advantageously be used as back lighting in liquid crystal indicator and other display device according to ligthing paraphernalia of the present invention.Therefore, according to ligthing paraphernalia of the present invention preferably have form by the reflection multilayer material, as the light reflecting element (light reflection member) of the 4th ingredient.
When being used as back lighting according to ligthing paraphernalia of the present invention, have near preferably the light reflecting element being arranged on the side surface of the light guiding piece beyond the side surface of light source, and more preferably on all the other all three side surfaces of light guiding piece and on the basal surface.In order to distinguish this light reflecting element from above-mentioned light reflection element, it is called " light reflecting element " especially.As long as material can show required light reflection function, can form this light reflecting element by any material.But, when considering splendid feature performance benefit, preferably form the light reflecting element by laminated reflective film in the mode identical with light reflection element.The example of suitable laminated reflective film comprises many stack membranes of polyethylene terephthalate (PEN) and its many stack membranes of getting thing (coPEN) altogether or PEN and syndiotactic polytyrene (sPS).In order to use laminated reflective film, consult Japanese national application (Kohyo) number 9-511844.
In according to ligthing paraphernalia of the present invention, by identical materials, especially laminated reflective film and mutually each other the laminated reflective film of one form light reflector element and light reflecting element.This structure can make this ligthing paraphernalia compactness, reduces the quantity of member and simplifies production run.And, can improve the intensity that is produced.Especially because laminated reflective film does not need to be cut into the form fit of many fritters and each several part, also become than being easier to so handle to become to be easier to and to obtain member and assemble.After having prepared a slice multilayer optical reflection film and being cut into reservation shape at first, with the topped smooth guiding piece of this film, to produce light reflector element and light reflecting element.When light reflecting element self do not have predetermined extent shape retention can the time, can carry out bonding to the light guiding piece of light reflecting element by the adhesive tape of using cementing agent, tackifier or two-sided cladding.Can carry out part or all the bonding of light reflecting element by the adhesive tape that applies the optical transparency of respectively doing for oneself or in other words be the cementing agent, tackifier or the two-way cladding that have the higher transfer coefficient separately to the light reflecting element bonding surface of light guiding piece.For the reflection with bonding interface reduces to minimum degree, the cementing agent that has near the refraction coefficient of the refraction coefficient of light guiding piece by use can bond.When the light guiding piece is the polypropylene guided plate, for example can advantageously use polypropylene type cementing agent.
Except above-described built-up section, can also selectively comprise one or more additional ingredients according to ligthing paraphernalia of the present invention.One example of the additional ingredient that is fit to is a light diffusion layer.Light diffusion layer is arranged on the bottom surface of light guiding piece, impels the diffusion and the evenly diffusion of generation of the light of light guiding piece inside effectively.Can light diffusion layer be formed many figures (for example flagpole pattern, point-like figure etc.) by the white pigments of the organic or inorganic material that for example comprises silica as light diffusion particulate, barium sulphide, titanium dioxide, beaded glass etc.In order to form this light diffusion layer, can advantageously use for example printing process of screen printing method.
More than narrated be used for the edge-light type backlight illuminating unit, as an exemplary, according to ligthing paraphernalia of the present invention, by the way, can constitute the vertical-type backlight illuminating unit in the mode identical basically, but the position that is provided with of light source is different with the edge-light type backlight illuminating unit.Therefore, will save detailed description here.
The present invention also provides liquid crystal indicator or other display device with such feature, and wherein, a ligthing paraphernalia is equipped with according to backlight illuminating unit of the present invention as a rear surface light source.
Can have traditional any structure in this technical field according to liquid crystal indicator of the present invention.In the situation of transmission type liquid crystal indicator, for example, can be set to a rear surface light source on the rear surface of liquid crystal board according to ligthing paraphernalia of the present invention, this liquid crystal board has wherein that liquid crystal is polarized plate holder structure therein in both sides.In the situation of half transmission type liquid crystal indicator, same, be set to a rear surface light source on the rear surface of liquid crystal board according to ligthing paraphernalia of the present invention.Liquid crystal board itself is not restricted especially in the present invention, and liquid crystal board is well-known for those skilled persons in this field.Therefore, will save detailed description at this.
Can be advantageously used in demonstration purposes in many household electrical appliance, measurement and other utensil according to LCD of the present invention.Example application according to LCD of the present invention, but they are not restrictive, comprise the large-sized monitor from the display of the compact of mobile phone for example, movable information terminal, video camera, digital camera etc. to for example personal computer and television receiver.When distortion that is used for taking place blooming and warpage have the large-sized monitor of 20 or 30 inches or above display area the time, can represent function of the present invention and effect.
The fabulous function and the effect that can represent it according to the field of ligthing paraphernalia of the present invention outside liquid crystal indicator.When photo or printing item are placed on when replacing LCD under this ligthing paraphernalia, this ligthing paraphernalia can be advantageously used for and be the front lit utensil.Can be used as the light source of projector (OHP) by the design of revising it ligthing paraphernalia of the present invention.And ligthing paraphernalia of the present invention can be used as the optical monitor of various surveying instruments and monitor.
[example]
As previously discussed, can advantageously carry out the present invention in many examples.Therefore, narrate some examples of the present invention with reference to the accompanying drawings.But should be appreciated that the present invention is not limited to following example.
Fig. 1 is that exemplary sectional view and Fig. 2 of illustrating according to the transmission type liquid crystal indicator of one embodiment of the invention are the stereographic maps that is used as the backlight illuminating unit of the rear surface light source in liquid crystal indicator shown in Figure 1.
As shown in Figure 1, this liquid crystal indicator 20 has a liquid crystal board 21, and this liquid crystal board comprises a liquid crystal cell 22 and from the top and the polarization plates 23 and 24 of clamping liquid crystal cell 22 from the below.This liquid crystal indicator 20 is provided with a ligthing paraphernalia of the present invention and an optic film structure, this ligthing paraphernalia comprises the backlight illuminating unit 10 on the not display surface side that is arranged on liquid crystal board 21, and this optic film structure comprises a blooming 5 and is set on the backlight illuminating unit 10.This blooming 5 is included in an optical diffusion film 5-1 of bottom and improves film 5-2 in an illumination on top.The film fixture, film Tension Control part and the film fixed frame that do not illustrate in blooming 5 and this accompanying drawing constitute optic film structure.Blooming 5 is fixed in the film fixed frame and is fixed in the housing of backlight illuminating unit 10 again under the tension force effect.The light that backlight illuminating unit 10 has at it transmits a lip-deep diffuser plate 7.Owing to, therefore will save detailed description to it from many structures with reference to the known liquid crystal board 21 in aspect.
As shown in Figure 2, backlight illuminating unit 10 comprises a rectangular light guided plate 2, is arranged near the opposite flank of polarization plates 2 all light sources 1, is configured to respectively around all lamp reflecting bodys 3 of light source 1 and the upper and lower lip-deep all multilayer reflectance coatings 4 of the side surface that does not have light source (surface, two opposite sides) that are arranged on guided plate 2.Rectangular slab 2 has the light diffusion layer 5 of one one-tenth point-like on whole basal surface.
In backlight illuminating unit 10 shown in the drawings, as common in this technical field, forming rectangular light guided plate 2 by the acrylic resin plate.Be arranged on light source 1 on the both side surface of light guide plate 2 and be to the cold cathode-ray tube (CRT) of fluorescent tube type and have and side surface length much at one.Around the lamp reflecting body 3 of each light source 1 is by having 98% or the reflectance coating that forms of the insulating material of above high light reflecting properties, be in particular laminated reflective film.This reflectance coating is bonded in the inside surface of supporter with cementing agent with suitable shape.The laminated reflective film 4 identical with the laminated reflective film that is used for lamp reflecting body 3 is assemblied in all the other side surfaces of light guide plate 2.But, do not use supporter therein, directly be bonded in this film with transparent cementing agent.Cementing agent is put on the whole surface of laminated reflective film, but according to circumstances, cementing agent can be put on this surperficial part or can utilize the belt of two-sided coated cementing agent to replace cementing agent.
Fig. 3 is the planimetric map that illustrates according to the ligthing paraphernalia of a preferred embodiment of the present invention, and Fig. 4 is the cut-open view along the line of ligthing paraphernalia shown in Figure 3 " IV-IV " intercepting.As understandable from this two accompanying drawing, ligthing paraphernalia of the present invention comprises a vertical-type backlight illuminating unit, and this unit has many light sources 1 and an optic film structure 30 of the present invention that is arranged on the backlight illuminating unit 10 that are arranged on the aluminum dipping form casting housing 11.This vertical-type backlight illuminating unit 10 comprises a light diffusing sheet 7 that is used to allow to be delivered to equably from the light of light source the lighting unit outside.As above with reference to Fig. 1 explanation like that, also on optic film structure 30, equip a unshowned liquid crystal display.
Vertical-type backlight illuminating unit 10 is the examples that schematically show.Actual backlight illuminating unit can have member outside the member shown in the drawings or the structure outside the structure shown in the drawings.For example, light source 1 can have as said many forms in the paragraph of edge-light type backlight illuminating unit.Can consider the aspect from intensity and moldability, the housing that housing 11 utilizes cast aluminium to form, but can form by other metal material and resin material.Consider to improve intensity, the shape of housing 11 can arbitrarily be changed.Wall portion can have double-walled construction or rib can be formed at wall, as the modification of housing.
In the situation of example, optic film structure 30 has a blooming 5, and this blooming has the blooming 5 that illumination on the optical diffusion film 5-1 and is improved the pair of lamina structure of film 5-2.Gap between two bloomings is about 0.8 millimeter.The film fixture is installed on the periphery of each blooming.In an example shown, 26 film fixtures altogether have been installed, have been firmly fixed to prevent this blooming distortion and assurance.As hereinafter with reference to Fig. 9 explanation, in the time that abundant effect can be accessed, the film fixture only can be fixed in four angles of blooming.
Do not limit the film fixture particularly, this fixture can by resin material or for example aluminum metallic material form arbitrary shape.In the situation of example, film fixture 16 is formed by resin plate, the V-shaped groove that this resin plate has about 0.3 millimeters deep in its wherein centre on a surface, about 0.5 millimeter of the thickness of this plate, the tinsel 17 that constitutes the part of film Tension Control part is assemblied in this V-type groove, by the cementing agent (not shown) film fixture is fixed in blooming 5.
When using sheet metal (for example aluminium sheet) as the film fixture, can be as shown in Figure 6 fixing film fixed head 26.At first, in order to use, at first prepare the aluminium sheet of 0.5 millimeters thick that the centre on a surface therein has the V-type groove of about 0.3 millimeters deep as the film fixture.After the tinsel 17 of a part that constitutes film Tension Control part is arranged in the V-shaped groove, with cementing agent 19 fixing metal silks 17 and film fixture 26.Secondly, by cementing agent bonding together with aluminium sheet with surperficial facing surfaces with V-type groove and blooming 5.
The film Tension Control part 17 that is installed on film fixture 16 is to be used for holding blooming 5 under tension force, keeps its flatness simultaneously.Therefore, the remainder of film Tension Control part 17, the flexible portion that has film Tension Control mechanism usually are comprised in the film fixed frame 18, but in Fig. 4 it are not shown.The example of flexible portion is that for example flexible flexible ingredient and for example rubber have viscoelastic resin ingredient.The flexible portion of film Tension Control part 17 can be directly connected in film fixture 16 or 26, perhaps is connected in the syndeton wiry that for example can further be arranged between flexible portion and the film fixture.
The far-end of film Tension Control part 17 is connected in film fixed frame 18, thus fixed optics film stably.Though particularly to its restriction, preferably light as far as possible the and fabulous material of intensity forms film fixed frame 18 by weight.The shape of film fixed frame 18 also can arbitrarily change.Usually preferably by crooked and casting procedure of processing film fixed frame 18 is shaped, so that rigid structure to be provided by for example aluminium or stainless metal.The shape of film fixed frame 18 preferably is a box-shaped or forms a frame shape by removing unnecessary wall part from box-shaped.Film fixed frame 18 is installed on the housing 11 of backlight illuminating unit 10 usually, but can be installed on other member when needed.
Example shown in Fig. 3 to 5 has used film fixture 16 has been fixed in one of them surperficial method among each blooming 5-1 and the 5-2.But, also can use the method that film fixture 16 is fixed in two surfaces of blooming 5-1 and 5-2, thereby shown in Fig. 7 and 8, the film fixture is firmly fixed at blooming.Shown example has used and has prepared bracket-shaped film fixture 16, inserted in this gap the end of blooming and the method for fixed optics film.Much less, can with two film fixtures mutually against, can bond together mutually by cementing agent then, especially, film fixed frame 18 is set on the side surface of housing 11 of backlight illuminating unit.Therefore, this structure can satisfy the latest requirement of display frame width preferably as far as possible little (usually from about 3 to 4 millimeters).
As from Fig. 7 and 8 understandable, the flexible portion (spring) 37 of film Tension Control part is accommodated in the box-shaped film fixed frame 18 and its ends are fixed.And flexible portion 37 is interconnected to film fixture 16 by tinsel 17.
Optic film structure 30 shown in Figure 3 has been represented has the blooming 5 of 26 film fixtures altogether.But, do not cause distortion and warpage if blooming stably can be fixed in film fixed frame 18, film fixture 16 only can be fixed in four angles of blooming.As shown in Figure 9.Shown under the situation of optic film structure, two film Tension Control parts 17 are fixed in a film fixture 16, and the far-end of each film Tension Control part 17 is installed on film fixed frame 18.
In practice of the present invention, can carry out by many structures film Tension Control part 17 is installed on film fixed frame 18.
As shown in figure 10, for example, prepared and be provided with a circle at its a wherein end and have the tinsel of film Tension Control mechanism as film Tension Control part 17.The other end of this film Tension Control part 17 is fixed in the outer peripheral film fixture 16 that is arranged on blooming 5.Circle as an end of film Tension Control part 17 is hooked on the pin 28 that is arranged on the film fixed frame 18.Because the existence of this circle, film Tension Control part 17 are flexible movable.
Perhaps, film Tension Control part 17 can be fixed in film fixed frame 18 shown in Figure 11 and 12 (along the cut-open view of the line XII-XII of Figure 11 intercepting).In the example, hook portion (piano wire) 27 is fixed in film fixed frame 18 by spiral shell 27 shown in this, and tinsel 17 is fixed in the middle body of piano wire 27.In this case, its part that applies the piano wire 27 of tension force is played the effect of flexible piece.
In addition, can be installed into for the open section that forms in the side surface of film fixed frame 18 as the piano wire 27 of flexible piece is bridged-style, as shown in figure 13.Because film fixed frame 18 is formed by for example steel metal material, therefore can firmly fix piano wire 27 by welding or other processing.
Can film Tension Control part 17 be fixed in film fixed frame 18 with Figure 14, Figure 15 (along the cut-open view of the line " XV-XV " of Figure 14 intercepting) and mode shown in Figure 16.
In this example shown in the drawings, two ends fixture (aluminium sheet) 16 is bonded in peripheral part, so that in each blooming 5-1 and 5-2, face mutually, the far-end of tinsel 17 that constitutes the part of film Tension Control part is installed in the V-shaped groove (not shown) support of each aluminium sheet 16, thus tinsel 17 play can the adaptive optics film extension and the effect of the flexible piece of contraction.
Figure 16 is illustrated in the installment state of a bight film Tension Control part 17 of film fixed frame 18.Also film Tension Control part 17 to be installed in the bight with the same procedure of the straight line portion shown in Figure 14 and 15.
When piano wire and metallic combination as previously discussed constitutes film Tension Control part, can obtain fabulous Tension Control performance, even when extension slightly that has blooming and contraction, film Tension Control part is worked in this way effectively, promptly replenishes to extend and shrink and prevent to produce even small distortion and warpage in blooming.
As above at length as described in, the present invention includes at least one, preferably two or more, blooming and can under filminess, use each blooming.So the present invention can weight reduction, and can keep the flatness of blooming.Therefore, the present invention can be provided for the optic film structure in liquid crystal indicator and other display device, and does not cause warpage and distortion.
The present invention can also provide have this fabulous optic film structure and can be used on ligthing paraphernalia in liquid crystal indicator and other display device.
The present invention can also provide liquid crystal indicator, this device aspect display performance that illumination is associated be splendid, can weight reduction, do not need to use individually blooming according to the film thickness of equipment size, can reduce the quantity of member and can be reduced at device fabrication during the assembly manipulation of member.
Except above-described remarkable result, the invention provides the following effect in liquid crystal indicator, for example:
The film that can not use before in big liquid crystal indicator, can using, have the high strength improvement effect, and the membrane structure that can realize having the higher illuminance improvement effect;
For large scale and the independent film that uses of middle-sized liquid crystal indicator, can provide the membrane structure that has than high-freedom degree (combination of all bloomings) before existing can irrespectively the use with high illumination improvement effect with size;
There not be the diffusion layer that is out of shape by utilizing an optical diffusion film to replace the polypropylene diffuser plate can provide for all sizes, can also weight reduction; And
Because a plurality of bloomings can combine, thus can simplify subsequently manufacturing step and obtain higher efficient and can cancel diaphragm.

Claims (10)

  1. A light that is arranged on lighting unit transmit lip-deep, be used to modulate light that sends from described lighting unit and the optic film structure of launching the light of modulated mistake, it comprises:
    At least one blooming;
    At least four blooming fixtures, they are arranged on the periphery place of described blooming;
    One film Tension Control part, it is connected in each described film fixture by this way with the one end, promptly states the flatness that blooming keeps described blooming simultaneously in the drop-down residence of tension force effect; And
    One film fixed frame, it is used for fixing described blooming, is connected in the other end of described film Tension Control part;
    Wherein, described blooming, described film Tension Control part and described film fixed frame mutually combine to one and constitute a member.
  2. 2. optic film structure as claimed in claim 1 is characterized in that, described blooming is from being improved film, polarizing coating by optical diffusion film, optical reflection film, illumination and having one that selects one group that the multifunctional optical film of the function of at least two described films forms.
  3. 3. optic film structure as claimed in claim 1 or 2 is characterized in that, forms described film Tension Control part by resilient material.
  4. 4. optic film structure as claimed in claim 3 is characterized in that, described resilient material is spring or rubber.
  5. 5. as the described optic film structure of above each claim, it is characterized in that, between them, have the gap or do not have stacked with gap described at least two bloomings.
  6. 6. as the described optic film structure of above each claim, it is characterized in that described optic film structure is used between the liquid crystal display and a lighting unit of liquid crystal indicator.
  7. 7. ligthing paraphernalia, it comprises:
    One lighting unit which comprises at least at least one light source and the light transmission surface that is used for guiding from the light of described light source outwardly; And
    As each described optic film structure of claim 1 to 5, the described light that it is set at described lighting unit transmits on the surface.
  8. 8. ligthing paraphernalia as claimed in claim 7 is characterized in that it is used as the backlight illuminating unit on the rear surface of liquid crystal indicator.
  9. 9. liquid crystal indicator, it comprises:
    One lighting unit which comprises at least at least one light source and the light transmission surface that is used for guiding from the light of described light source outwardly;
    As each described optic film structure of claim 1 to 5, the described light that it is set at described lighting unit transmits on the surface; And
    One liquid crystal display, it is arranged on the described optic film structure.
  10. 10. liquid crystal indicator as claimed in claim 9 is characterized in that described lighting unit is a backlight illuminating unit.
CNB2004800022024A 2003-01-17 2004-01-15 Optical film structure, illumination apparatus and liquid crystal display device Expired - Fee Related CN100360974C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003009775A JP2004219926A (en) 2003-01-17 2003-01-17 Optical film structure, illuminator, and liquid crystal display device
JP009775/2003 2003-01-17

Publications (2)

Publication Number Publication Date
CN1739050A true CN1739050A (en) 2006-02-22
CN100360974C CN100360974C (en) 2008-01-09

Family

ID=32820524

Family Applications (1)

Application Number Title Priority Date Filing Date
CNB2004800022024A Expired - Fee Related CN100360974C (en) 2003-01-17 2004-01-15 Optical film structure, illumination apparatus and liquid crystal display device

Country Status (6)

Country Link
EP (1) EP1583991A1 (en)
JP (1) JP2004219926A (en)
KR (1) KR20050089884A (en)
CN (1) CN100360974C (en)
TW (1) TW200500740A (en)
WO (1) WO2004068207A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102099731A (en) * 2008-05-30 2011-06-15 3M创新有限公司 Suspended optical film
CN102865520A (en) * 2012-10-11 2013-01-09 深圳市华星光电技术有限公司 Liquid crystal display device and backlight module thereof
CN101688997B (en) * 2007-07-03 2013-08-21 3M创新有限公司 Backlight assembly with optically transmissive composite film
CN103939851A (en) * 2014-03-25 2014-07-23 京东方科技集团股份有限公司 Backlight module frame, backlight module and display device
CN107003489A (en) * 2014-10-10 2017-08-01 普睿司曼股份公司 Device and component for keeping passive optical module
CN109375414A (en) * 2018-10-23 2019-02-22 惠州市华星光电技术有限公司 A kind of backlight module
CN109661538A (en) * 2016-09-13 2019-04-19 夏普株式会社 Optical component, lighting device and display device
CN112912790A (en) * 2019-02-22 2021-06-04 株式会社Lg化学 Panel position alignment device

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005276718A (en) * 2004-03-26 2005-10-06 Sharp Corp Backlight device
US7446827B2 (en) 2004-10-15 2008-11-04 3M Innovative Properties Company Direct-lit liquid crystal displays with laminated diffuser plates
US7710511B2 (en) * 2004-10-15 2010-05-04 3M Innovative Properties Company Liquid crystal displays with laminated diffuser plates
US7304694B2 (en) * 2005-01-12 2007-12-04 Cree, Inc. Solid colloidal dispersions for backlighting of liquid crystal displays
US7660040B2 (en) * 2005-05-17 2010-02-09 E. I. Du Pont De Nemours And Company Diffuse reflective article
JP4704868B2 (en) * 2005-09-22 2011-06-22 大成プラス株式会社 Chassis frame manufacturing method and chassis frame for large flat display device
JP4878867B2 (en) * 2005-12-16 2012-02-15 大成プラス株式会社 Optical sheet holder for liquid crystal display device
US8031289B2 (en) 2005-09-22 2011-10-04 Taisei Plas Co., Ltd. Optical sheet retaining tool and chassis for liquid crystal display device
WO2007046274A1 (en) * 2005-10-18 2007-04-26 Toray Industries, Inc. Optical sheet-supporting body, backlight for liquid crystal display using same, and liquid crystal display
JP2007225781A (en) * 2006-02-22 2007-09-06 Hitachi Displays Ltd Liquid crystal display device
US20070211184A1 (en) * 2006-03-10 2007-09-13 Luminus Devices, Inc. Liquid crystal display systems including LEDs
JP4659708B2 (en) * 2006-09-06 2011-03-30 シャープ株式会社 Backlight device and liquid crystal display device
KR100766937B1 (en) 2006-10-23 2007-10-17 삼성에스디아이 주식회사 Light emission device and display
CN101680614B (en) 2007-06-04 2011-08-03 夏普株式会社 Backlight unit, display unit and television receiver
KR20100087313A (en) * 2007-10-04 2010-08-04 쓰리엠 이노베이티브 프로퍼티즈 컴파니 Stretched film for stereoscopic 3d display
JP5416134B2 (en) * 2008-01-08 2014-02-12 ドルビー ラボラトリーズ ライセンシング コーポレイション Parallax reduction
KR101461560B1 (en) * 2008-04-14 2014-11-13 엘지전자 주식회사 Illuminating apparatus
JP5444539B2 (en) * 2009-07-17 2014-03-19 株式会社エンプラス Internal illumination system
JP4932017B2 (en) * 2010-06-10 2012-05-16 株式会社スズデン Lighting member using light diffusing member
JP5680495B2 (en) * 2011-07-13 2015-03-04 株式会社ジャパンディスプレイ Display device, manufacturing method thereof, and electronic device
CN102508349B (en) * 2011-11-21 2016-03-02 中航华东光电有限公司 A kind of optical film assembly fixture
JP6192897B2 (en) * 2012-04-11 2017-09-06 サターン ライセンシング エルエルシーＳａｔｕｒｎ Ｌｉｃｅｎｓｉｎｇ ＬＬＣ LIGHT EMITTING DEVICE, DISPLAY DEVICE, AND LIGHTING DEVICE
KR102122334B1 (en) * 2013-11-14 2020-06-12 엘지디스플레이 주식회사 Backlight Unit and Display Device Using The Same
CN108139037A (en) * 2015-10-14 2018-06-08 索尼公司 Luminescent device, display device and lighting device
CN108037619B (en) * 2018-01-25 2020-08-04 惠州市华星光电技术有限公司 Backlight module and liquid crystal display

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2242567A (en) * 1935-11-22 1941-05-20 Bernard M Bodde Manufacture of translucent screens
GB496971A (en) * 1936-06-26 1938-12-09 Edmond Henri Victor Noaillon Improvements in or relating to the stereoscopic projection of pictures
US2444520A (en) * 1946-04-26 1948-07-06 Polaroid Corp Frame mounting means for flexible sheetlike materials
US2905757A (en) * 1954-02-03 1959-09-22 Emi Ltd Light correcting apparatus for electron pick-up tubes
JP2550880B2 (en) * 1993-08-24 1996-11-06 日本電気株式会社 Filter holding mechanism
JPH0793966A (en) * 1993-09-24 1995-04-07 Hitachi Ltd Magnetic disk apparatus
JPH08160203A (en) * 1994-12-07 1996-06-21 Sekisui Chem Co Ltd Picture quality improving film for liquid crystal display

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101688997B (en) * 2007-07-03 2013-08-21 3M创新有限公司 Backlight assembly with optically transmissive composite film
CN102099731A (en) * 2008-05-30 2011-06-15 3M创新有限公司 Suspended optical film
CN102865520A (en) * 2012-10-11 2013-01-09 深圳市华星光电技术有限公司 Liquid crystal display device and backlight module thereof
CN102865520B (en) * 2012-10-11 2015-11-25 深圳市华星光电技术有限公司 A kind of liquid crystal indicator and backlight module thereof
CN103939851A (en) * 2014-03-25 2014-07-23 京东方科技集团股份有限公司 Backlight module frame, backlight module and display device
CN107003489A (en) * 2014-10-10 2017-08-01 普睿司曼股份公司 Device and component for keeping passive optical module
CN107003489B (en) * 2014-10-10 2019-12-20 普睿司曼股份公司 Device and assembly for holding passive optical module
CN109661538A (en) * 2016-09-13 2019-04-19 夏普株式会社 Optical component, lighting device and display device
CN109375414A (en) * 2018-10-23 2019-02-22 惠州市华星光电技术有限公司 A kind of backlight module
CN112912790A (en) * 2019-02-22 2021-06-04 株式会社Lg化学 Panel position alignment device
CN112912790B (en) * 2019-02-22 2023-09-22 杉金光电(苏州)有限公司 Panel position alignment device

Also Published As

Publication number Publication date
WO2004068207A1 (en) 2004-08-12
EP1583991A1 (en) 2005-10-12
TW200500740A (en) 2005-01-01
CN100360974C (en) 2008-01-09
JP2004219926A (en) 2004-08-05
KR20050089884A (en) 2005-09-08

Similar Documents

Publication Publication Date Title
CN1739050A (en) Optical film structure, illumination apparatus and liquid crystal display device
TWI422922B (en) A planar lighting device, and a liquid crystal display device provided with the same
TWI313775B (en) Backlight module and illumination device thereof
JP4790651B2 (en) Surface light source device and display device using the surface light source device
TWI354839B (en) Back light module
JP2005310611A (en) Backlight device and display
KR100790497B1 (en) Direct type Back-light unit for LCD
CN1940603A (en) Optical member, method of manufacturing the optical member, and display device having the optical member
JP2008053013A (en) Backlight device, and liquid crystal display device
TW200827855A (en) Light cube and flat light unit and liquid crystal display device including light cube
CN101556023A (en) LED light source with wide-angle lens
CN1758116A (en) White light generating unit, backlight assembly and liquid crystal indicator
CN101065609A (en) Light guide plate, as well as a planar lighting device and liquid crystal display apparatus using the same
CN1485661A (en) Deployment of configuration information
CN101561085A (en) Wide-angle LED light source
JP2011096494A (en) Planar lighting device and liquid-crystal display device including the same
US20060171164A1 (en) Optical film structure, illlumination apparatus and liquid crystal display device
CN1930515A (en) Liquid crystal display panel and liquid crystal display device
US7766516B2 (en) Diffusion plate of backlight structure and display device using the same
TWI358580B (en) Backlight module and liquid crystal display device
CN1877374A (en) Light guide plate, backlight assembly and liquid crystal display with the backlight assembly
TWI358004B (en) Backlight module
KR20160015833A (en) Backlight device for LCD panel using quantum dot microcapsules
KR20160015831A (en) Backlight device for LCD panel using quantum dot microcapsules
TW201024862A (en) Backlight module which increases optics energy utility rate

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20080109

Termination date: 20100222