CN101246281A - Backlight assembly, display device provided with the same, and method thereof - Google Patents

Backlight assembly, display device provided with the same, and method thereof Download PDF

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Publication number
CN101246281A
CN101246281A CNA2008100920573A CN200810092057A CN101246281A CN 101246281 A CN101246281 A CN 101246281A CN A2008100920573 A CNA2008100920573 A CN A2008100920573A CN 200810092057 A CN200810092057 A CN 200810092057A CN 101246281 A CN101246281 A CN 101246281A
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CN
China
Prior art keywords
light source
light
backlight assembly
guide plate
group
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
CNA2008100920573A
Other languages
Chinese (zh)
Other versions
CN101246281B (en
Inventor
李庚燉
权载中
金佑濬
沈成圭
金炯柱
崔震成
黄仁瑄
白承仁
辛宅善
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Samsung Display Co Ltd
Original Assignee
Samsung Electronics Co Ltd
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Filing date
Publication date
Priority claimed from KR1020070023960A external-priority patent/KR20080083421A/en
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Publication of CN101246281A publication Critical patent/CN101246281A/en
Application granted granted Critical
Publication of CN101246281B publication Critical patent/CN101246281B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • 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
    • G02B6/0073—Light emitting diode [LED]
    • 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

Abstract

The invention provides a backlight assembly, display device provided with the same, and method thereof. The backlight assembly, usable in a display device, includes a plurality of light sources and a light guiding plate guiding light emitted from the light sources, wherein the light sources are arranged corresponding to a side of the light guiding plate and the side includes a central portion. The light sources include first light sources as a first group arranged on the central portion of the light guiding plate, and second light sources as a second group adjacent to the first group, wherein a pitch of the first light sources is smaller than a pitch of the second light sources.

Description

Backlight assembly, display device and method thereof with this backlight assembly
Technical field
The present invention relates to backlight assembly, have the display device and the method thereof of this backlight assembly.More specifically, the present invention relates to have backlight assembly, display device and the method thereof of improving optical efficiency with this backlight assembly.
Background technology
Current, developing various display devices.For example, because the fast development of semiconductor technology has the LCD (LCD) of improving character and is widely used as display device.
Because size can increase or reduce significantly, can reduce weight and the energy consumption of LCD, existing cathode ray tube (CRT) is replaced by LCD.Therefore, LCD is being used for medium size or large scale product, for example monitor and televisor, and small-size product, for example portable phone, PDA(Personal Digital Assistant) and portable media player (PMP).Simultaneously because LCD is not light emitting device, its need light source for example light emitting diode (LED) light is provided.
Summary of the invention
The invention provides the backlight assembly with maximum optical efficiency, the display device that comprises this backlight assembly and method thereof.
Exemplary embodiment of the present invention provides a kind of backlight assembly, and it comprises a plurality of light sources and guides from the light guide plate of the light of light emitted.Light source is corresponding to a side setting of light guide plate, wherein this side comprises core, light source comprises that the spacing of first light source is less than the spacing of secondary light source as the secondary light source of second group of first group of conduct that is arranged on first light source on the light guide plate core and contiguous first group.
This side of light guide plate can further comprise two angle parts that are arranged on each side of core, and first group nearer than the elongation part apart from core.
Distance between adjacent light source can be with little by little reducing near core.Light source can be symmetrical arranged with respect to the core minute surface.
Light source can further comprise the 3rd light source as the 3rd group, and wherein first group can be arranged between second group and the 3rd group, and the number of light sources of second group and the 3rd group is an even number.The number of secondary light source can be identical with the number of the 3rd light source.
The spacing of secondary light source can be that the spacing of first light source can be uniform basically uniformly basically.
Backlight assembly can further comprise the viewing area from source emissioning light, and wherein first mean distance between first light source and the viewing area can be less than second mean distance between secondary light source and the viewing area.Distance between first light source and the viewing area can be basic identical, and the distance between secondary light source and the viewing area can be with reducing near core.Light guide plate can comprise at least one pressing part, and first light source is provided with corresponding to this at least one pressing part.This at least one pressing part can comprise a plurality of pressing parts, and when near core, these a plurality of pressing parts can become and move closer to the viewing area.Second mean distance can be about 0.2 in about 0.5 scope to the ratio of the average headway of secondary light source.Second mean distance can be about 0.3 to the ratio of the average headway of secondary light source.
Light guide plate can comprise two sides, and these two sides face with each other or continuously, at least one side of these two sides is facing to first light source and secondary light source.
Light guide plate can comprise at least one surface with catoptrical a plurality of patterns, and this pattern can be with forming more thick and fast near core.
Light source can be light emitting diode (LED).LED can be installed on the printed circuit board (PCB) (PCB).Each LED can comprise red emission sheet, green emission sheet and blue emission sheet, and perhaps white hair is penetrated sheet.
Largest interval between first light source can be less than the largest interval between the secondary light source.
Other exemplary embodiment of the present invention provides a kind of backlight assembly with luminous viewing area, this backlight assembly comprises a plurality of light sources and guides from the light guide plate of the light of light emitted, wherein light source is corresponding to a side setting of light guide plate, and this side comprises core.Light source is provided with even interval, and the distance between light source and the viewing area is with reducing gradually near core.
This side can comprise at least one pressing part, and light source can be provided with corresponding to this at least one pressing part.
Other exemplary embodiment of the present invention provides a kind of backlight assembly, and it comprises a plurality of LED that comprise at least one light tiles, and the light guide plate of the side of contiguous these a plurality of LED setting.The density that is arranged on the LED on the light guide plate one side core is greater than the density that is arranged on the LED on light guide plate one lateral edge portions.
Other exemplary embodiment of the present invention provides a kind of display device, it comprise display image display panel, provide a plurality of light sources of light and guiding light guide plate to display panel from the light of light emitted.This light source is corresponding to a side setting of light guide plate, this side comprises core, this light source comprises as first light source on first group of core that is arranged on light guide plate, and the secondary light source of second group of contiguous first group conduct, and the spacing of first light source is less than the spacing of secondary light source.
Distance between the adjacent light source can be with reducing near core.
This display device may further include that at least one is provided at reflecting element below the light guide plate, at least one is arranged on optical sheet on the light guide plate and at least one receives the retaining element of light guide plate and light source.
Other exemplary embodiment of the present invention provides a kind of method that improves the display screen visibility, this display screen has backlight assembly, this backlight assembly has the viewing area, this method comprises that contiguous light guide plate one side is provided with a plurality of light sources, this side comprises core, first light source in the group of winning is arranged on the core of light guide plate, the contiguous first group of setting of secondary light source in second group, wherein be provided with a plurality of light sources comprise following at least one: first light source have than the closely spaced spacing of secondary light source is set, and first light source is set, its apart from first mean distance of viewing area less than second mean distance between secondary light source and the viewing area.
Description of drawings
In conjunction with the drawings to the following description of exemplary embodiment, above-mentioned and further feature of the present invention and advantage thereof will become obviously and be easier to understand, wherein:
Fig. 1 be schematically illustrated according to the present invention the decomposition diagram of the exemplary backlight assembly of first exemplary embodiment;
Fig. 2 is the assembled perspective view of light source, flexible printed circuit film and light guide plate among Fig. 1.
Fig. 3 is the planimetric map of the exemplary backlight assembly shown in the presentation graphs 1;
Fig. 4 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of second exemplary embodiment;
Fig. 5 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 3rd exemplary embodiment;
Fig. 6 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 4th exemplary embodiment;
Fig. 7 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 5th exemplary embodiment;
Fig. 8 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 6th exemplary embodiment;
Fig. 9 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 7th exemplary embodiment;
Figure 10 is the schematically illustrated decomposition diagram that comprises the exemplary display device of exemplary backlight assembly shown in Figure 1.
Embodiment
To describe the present invention more fully with reference to the accompanying drawings hereinafter, wherein show exemplary embodiment of the present invention.As skilled in the art will recognize, described embodiment can be made amendment by all different modes that does not break away from the spirit and scope of the present invention.All identical reference marker is indicated same or analogous element in the accompanying drawing.
Be appreciated that when an element for example layer, film, zone or substrate be designated as another element " on " time, it can perhaps also insertion element can occur directly on another element.On the contrary, when an element be designated as " directly " another element " on " time, then do not have insertion element.As used herein, term " and/or " comprise one or more relevant list any of project and all combinations.
Can be used to describe various elements, assembly, zone, layer and/or part although be appreciated that the term first, second, third, etc. at this, these elements, assembly, zone, layer and/or part should be by these term restrictions.These terms only are used for distinguishing an element, assembly, zone, layer or part and another element, assembly, zone, layer or part.Therefore, under the situation that does not break away from the present invention's instruction, first element that describes below, assembly, zone, layer or part can be called second element, assembly, zone, layer or part.
Term only is used to describe the purpose of specific embodiment as used herein, and does not want to limit the present invention.Unless context has other clearly to indicate, singulative as used herein " " also wants to comprise plural form.Can further understand, when using term " to comprise " in this manual and when " having comprised ", show the existence of described feature, integral body, step, operation, element and/or assembly, but do not get rid of the existence or the increase of one or more further features, integral body, step, operation, element, assembly and/or group.
The term of space correlation, for example " ... under ", " ... following ", " lower ", " last " etc., be used herein to element easily describing shown in the accompanying drawing or feature relation to another element or feature.Be appreciated that the implication of in accompanying drawing, describing that different implications use or apparatus operating wanted to comprise in these space correlation terms.For example, if the equipment in the accompanying drawing is put upside down, be described as element in other element or feature " under " or " below " will be oriented in other element or feature " on ".Therefore, exemplary term " ... following " comprise upper and lower to.This equipment can revolve and turn 90 degrees or to other direction, correspondingly explain the description of space correlation as used herein.
Unless other different qualification is arranged, and all as used herein terms (comprising technical term and scientific terminology) have the identical meaning with one skilled in the art's common sense of the present invention.Can further understand these terms, those terms that in normally used dictionary, use for example, unless be expressed as such qualification at this, should be interpreted as having and they consistent meanings under background of related, and be not interpreted as idealized or the too formalized meaning.
Describe embodiments of the invention at this with reference to skeleton view and cross-sectional view, these figure are schematic diagrams of desirable embodiment of the present invention.Similarly, can expect result as manufacturing technology for example and/or the illustrated different shape of instructions.Therefore, embodiments of the invention should not be interpreted as the restriction of the special shape in zone shown here, but comprise for example owing to the deviation of making the shape that causes.For example, being designated as the zone on plane or the zone that is described as plane domain can be typically coarse and/or have nonlinear characteristic.Simultaneously, it can be slick and sly being designated as the parts with sharp edge.Therefore, Zhi Shi zone is the principle formula in essence in the accompanying drawings, and their shape is not intended to the true shape in the zone of the equipment of describing, and is not intended to limit the scope of the invention.
Fig. 1 schematically illustrated according to the present invention the decomposition diagram of the exemplary backlight assembly 100 of first exemplary embodiment, Fig. 2 is the assembled perspective view of light source 10, flexible printed circuit film 15 and light guide plate 20 among Fig. 1.Backlight assembly 100 according to the present invention can be used for electronic product, for example PDA(Personal Digital Assistant) and portable media player (PMP), but be not limited thereto.
With reference to figure 1 and Fig. 2, backlight assembly 100 comprises light source 10 (being illustrated by the broken lines) and light guide plate 20.And this backlight assembly 100 comprises the reflector plate 30 that is arranged on below the light guide plate 20, be arranged on optical sheet 40, adhesive element 50 on the light guide plate 20, be used for fixing or receive first retaining element 60 and second retaining element 70 of said modules.
Light emitting diode (LED) can be used as light source 10.The size that reduces LED is easily, so LED is suitable for the light source of small size or medium size display device.LED can comprise one of them of red emission (emitting chip) sheet, green emission sheet and blue emission sheet, and LED can launch the white light that comprises ruddiness, green glow and blue light.Simultaneously, LED can comprise that the white hair of launching white light penetrates sheet, and can further comprise to the emission sheet and the energy feed end of energy is provided and is used for sealing the molded element of emission sheet.
Light source 10 is installed on the upper surface of flexible print circuit (FPC) film 15 that is fixed to first retaining element 60, and FPC film 15 is electrically connected to light source 10 by a plurality of signal wire patterns that are formed on the FPC film 15.Therefore, FPC film 15 receives driving voltage by coupling part 151 from the outside, but and driving light source 10.Light is emitted by the light-emitting area 12 on light source 10 surfaces.Light-emitting area 12 is perpendicular to the upper surface of FPC film 15.Selectively, light source 10 can be installed on the metal-core printed circuit board (MCPCB), and insulation course or reflection layer can be coated on the surface that light source 10 is installed.
Eight light sources 10 have been shown among Fig. 1 and Fig. 2, but these are the numbers that illustrate LED, so the present invention is not restricted to this.Light source 10 can be formed by various numbers.
Light source 10 is arranged to face the side 201 of light guide plate 20.Particularly, the light-emitting area 12 of light guide plate 20 and side 201 face with each other.Therefore, the light that is sent by light-emitting area 12 is directly incident on the side 201 of light guide plate 20, and light guide plate 20 direct emitted light also will be launched light equably and be diffused on the whole surface of light guide plate 20.Diffusion light is advanced to optical sheet 40 in Z-direction.A plurality of patterns be formed on light guide plate 20 in the face of on the side of reflector plate 30, lower surface for example, so as light on Z-direction to optical sheet 40 emissions.Simultaneously, reflector plate 30 reflects the light that sends from light guide plate 20 on Z-direction.Therefore, can minimizes light loss.
The brightness of the light that sends from light guide plate 20 and homogeneity have the brightness of improvement and inhomogeneity light and launch backlight assembly 100 as light sheets by improving via optical sheet 40.
Adhesive element 50 is arranged on the optical sheet 40.Backlight assembly 100 can independently use, and perhaps can be used as the light source of non-emission display panel.Therefore, adhesive sheet 50 can be used for backlight assembly 100 is adhered to non-emission display panel, and contact adhesive (PSA) can be used as adhesive sheet 50.Adhesive material in the PSA scatters by pushing equably, so that can backlight assembly 100 be fixed to display panel by pressure-sensitive adhesive sheet 50.Be formed on openings 501 in the adhesive sheet 50 in the face of being used for radiative active display area (as shown in Figure 3 " ADA).
First retaining element 60 receives light guide plate 20, FPC film 15, optical sheet 40 and adhesive sheet 50.Reflector plate 30 is fixed on below first retaining element 60, and uses second retaining element 70 closed and fixed.Because first retaining element 60 directly contact the inner member of backlight assembly 100, first retaining element 60 is formed by low density material, with the inner member damage that prevents to cause owing to the contact between the inner member of the feasible backlight assembly 100 of external impact.For example, first retaining element 60 can be by resin manufacture.
Simultaneously, second retaining element 70 is formed with the inner member of protection backlight assembly 100 by high density material and avoids external impact.For example, second retaining element 70 can be by the metal manufacturing of for example stainless steel (SUS).
As illustrated in fig. 1 and 2, the interval difference between a plurality of light sources 10 in according to an exemplary embodiment of the present.Compare with a plurality of light sources 10 of contiguous light guide plate 20 end portion, a plurality of light sources 10 are intensive at the core of light guide plate 20.The observer wants to watch the marginal portion of the core of display screen more than display screen.Therefore, the brightness of display screen core is more important.Therefore, more even than the brightness of the whole viewing area of control, preferably be the brightness that improves the viewing area core.That is to say that the brightness that improves the viewing area core is effective.By using these illustrative methods according to an exemplary embodiment of the present invention, can improve the visual quantity that also can minimize light source 10 of backlight assembly 100, this will further describe with reference to figure 3.
Fig. 3 is the planimetric map of expression exemplary backlight assembly shown in Figure 1, and the backlight assembly 100 that Fig. 1 is shown is in confined state.Because light source 10 and light guide plate 20 are received in the backlight assembly 100, they are illustrated by the broken lines.
As shown in Figure 3, depend on light source 10 with respect to the setting area of light guide plate 20 and their position, light source 10 is categorized as first to the 3rd group of G1, G2, G3.The side 201 of light guide plate 20 comprises the core 2011 between the angle part 2013.The one group of light source 101 that is arranged on the core 2011 is defined as first group of G1, and the remaining light sources 102 and 103 that is arranged on angle part 2013 is defined as second and the 3rd group of G2 and G3.Second group of G2 and the 3rd group of G3 are separately positioned on each side of first group of G1.The core 2011 of first group of contiguous light guide plate 20 of G1 is provided with, and the angle part 2013 of second group of G2 and the 3rd group of contiguous light guide plate 20 of G3 is provided with.
As shown in Figure 3, the first spacing P1 of the light source 101 of first group of G1 is different from the 3rd spacing P3 of the light source 103 of the second spacing P2 of light source 102 of second group of G2 and the 3rd group of G3.Being provided with of light source 101 can be inhomogeneous, so that can improve the brightness of backlight assembly 100.
The first spacing P1 is less than the second spacing P2 and the 3rd spacing P3.That is to say that first light source 101 of contiguous core 2011 is nearer than the secondary light source 102 and the 3rd light source 103 of difference adjacent corners part 2013 each other.Therefore, more light can be provided in the core 2011 of light guide plate 20, so that can improve the brightness of active display area territory ADA core.
Interval between the light source 101,102 and 103 can be further with respect to the center minute surface symmetry of the side 201 of light guide plate 20.The center of the side 201 of light guide plate 20 is positions that the side 201 of light guide plate 20 is divided equally.
First light source 101, secondary light source 102 and the 3rd light source 103 can be respectively to be disposed in an evenly spaced relation in separately in first group of G1, second group of G2 and the 3rd group of G3.That is to say, the first spacing P1, the second spacing P2 and the 3rd spacing P3 can be respectively in first to the 3rd group of G1, G2, G3 evenly so that can be even by the brightness of the light of backlight assembly 100 emissions.Yet each between the light source 101,102 and 103 can change by process redundancy at interval.Even its generation, because process redundancy is insignificant, the average of the first spacing P1 still average than the second spacing P2 and the 3rd spacing P3 is little.
Except that core 2011, the brightness of the angle part 2013 of light guide plate 20 can be even by the light that same amount is provided.Therefore, the number of the secondary light source 102 of second group of G2 is identical with the number of the 3rd light source 103 of the 3rd group of G3.In Fig. 3, the number of secondary light source 102 and the 3rd light source 103 is two, yet, can use the secondary light source 102 and the 3rd light source 103 of other number.No matter whether the number of each secondary light source 102 and the 3rd light source 103 is even number or odd number, and the sum of secondary light source 102 and the 3rd light source 103 is even numbers.
Fig. 4 is the planimetric map of schematically illustrated exemplary backlight assembly according to the present invention's second exemplary embodiment.Zone A and B are exaggerated the pattern of representing to be formed on light guide plate 20 lower surfaces of reflector plate 30 209.Because the structure of the backlight assembly 200 almost structure with the backlight assembly 100 of Fig. 1 is identical, therefore used the similar elements of similar number, omit description about it.
As shown in Figure 4, light source 10 is provided with corresponding to two sides 201 and 203 of light guide plate 20.Two sides 201 and 203 are connected to each other, and extend along X-axis and Y direction respectively.Because light source 10 is provided with corresponding to two continuous sides 201 and 203 of light guide plate 20, can obtain to have the display screen of high brightness.
Be formed on the light of a plurality of patterns 209 reflection sources 10 emissions on light guide plate 20 lower surfaces, reflected light is by active display area territory ADA emission.As shown in Figure 4, the pattern 209 of A part is provided with more thick and fast than the pattern 209 of B part.That is to say that pattern 209 is with the more crypto set that becomes of the core near light guide plate 20.Certainly, pattern 209 can form on the upper surface of light guide plate 20, and light guide plate 20 can be by having that good transmissivity and preventing is out of shape or the material of broken integrality forms, for example polymethylmethacrylate (PMMA).
As mentioned above, pattern 209 is to the core of the light guide plate 20 more crypto set that becomes.Therefore, the light of light guide plate 20 reflection sources 10 emission, and the reflected light with favorable luminance can be launched to the outside by active display area territory ADA.As the result that the pattern density towards light guide plate 20 cores increases, having the light that improves brightness can be in the core emission of backlight assembly 200.
Fig. 5 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 3rd exemplary embodiment.Because the planar structure of backlight assembly 300 is almost identical with the planar structure of backlight assembly 100 among Fig. 3, therefore similar elements has been used same tag, omits the description about it.
As shown in Figure 5, the light source 10 that is arranged on thick and fast on the core can be provided with symmetrically.That is to say that light guide plate 20 has relative side 201 and 205, they extend and face with each other in X-direction.Light source 10 is 201 and 205 settings along the side, outwards launch by the core of backlight assembly 300 so that have the light that improves brightness.
Fig. 6 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 4th exemplary embodiment.Because the planar structure of the backlight assembly 400 almost planar structure with the backlight assembly 100 of Fig. 3 is identical, uses identical mark for components identical, and omits the description about it.
As shown in Figure 6, light source 10 is arranged on the side 201 of light guide plate 20.Little by little reduce to core 2011 at interval between the adjacent light source 10.That is to say that the density that is positioned at the nearer light source 10 of core 2011 is than the density height that is positioned near the light source 10 of marginal portion.Simultaneously, the first half of light source 10 can be provided with second hemihedry ground of light source 10.Therefore, because light source 10 is provided with on core 2011 more thick and fast, having the light that improves brightness can outwards launch by the core of backlight assembly 400.
Fig. 7 be schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 5th exemplary embodiment.Because the planar structure of the backlight assembly 500 almost planar structure with the backlight assembly 100 of Fig. 3 is identical, uses identical mark for components identical, and omit explanation it.
As shown in Figure 7, light guide plate 22 (dotted line) has the pressing part 221 of the light guide plate of being formed on 22 1 sides, at this light source 101 is set.In other words, light guide plate 22 is recessed at the core of the light incident surface of light guide plate 22.Therefore, light source 101 to the second group G2 of first group of G1 and the light source 104 of the 3rd group of G3 and light source 105 more contiguous active display area territory ADA, at this first group of G1 between second group of G2 and the 3rd group of G3.Distance between light source 101 in first group of G1 and the active display area territory ADA is that the light that correspondingly has uniform luminance can be provided on the ADA core of active display area territory uniformly.Simultaneously, as shown in Figure 7, in second group of G2 and the 3rd group of G3, light source 104 and 105 and active display area territory ADA between distance be respectively uniform.
Yet the present invention is not restricted to above-mentioned exemplary embodiment.Distance between light source and the active display area territory ADA can be different in same group.But, when consider each light source 101,104 and 105 and active display area territory ADA between mean distance the time, the mean distance between light source 101 and the active display area territory ADA less than light source 104 and 105 and active display area territory ADA between mean distance.
Because the light source 101 of first group of G1 is more near active display area territory ADA core, the brightness that can improve the viewing area core.And light source 104 and 105 spacing can be greater than the spacings of light source 101, light source 104 and 105 more farther apart from active display area territory ADA than light source 101.In the ADA of active display area territory, do not produce blackboard branch (dark portion).Shown in the right side of Fig. 7, from the light L of light source 105 emissions and the imbricate of active display area territory ADA, so that can prevent from the ADA of active display area territory, to take place the blackboard branch.
For the generation that prevents that blackboard from dividing, the mean distance d1 between light source 104 and the active display area territory ADA is preferably in about 0.2 in about 0.5 scope to the ratio of the average headway d2 between the light source 104.When the average headway d2 between the light source 104 is very big, perhaps when the mean distance d1 between light source 104 and the active display area territory ADA very hour, may produce the blackboard branch.On the contrary, if the average headway d2 between the light source 104 is too small or light source 104 and active display area territory ADA between mean distance d1 excessive, reduced the brightness of active display area territory ADA.In fact, mean distance d1 preferably is about 0.3 basically to the ratio of mean distance d2.
Fig. 8 schematically illustrated according to the present invention the planimetric map of the exemplary backlight assembly of the 6th exemplary embodiment.Because the planar structure of the backlight assembly 600 almost planar structure with the backlight assembly 500 of Fig. 7 is identical, components identical is used identical mark, and omit the explanation to it.
As shown in Figure 8, light guide plate 23 (dotted line) has a plurality of pressing parts 231 and 233, and light source 1011 and 1013 is separately positioned on pressing part 231 and 233.In other words, light guide plate 23 is recessed with step portion, and this step portion is provided with symmetrically with respect to the central area of the light incident surface of light guide plate 23, and maximum recessed portion is positioned at the center.When near the core of light guide plate 23, pressing part 231 and 233 is more near active display area territory ADA.Therefore, having the light that improves brightness can be by the core emission of viewing area.
The planimetric map of the schematically illustrated exemplary backlight assembly according to the present invention's the 7th exemplary embodiment of Fig. 9.Because the planar structure of the backlight assembly 700 almost planar structure with the backlight assembly 500 of Fig. 7 is identical, components identical is used identical mark, and omit the description to it.
As shown in Figure 9, a plurality of light sources are provided with even interval basically betwixt.Along with the core 2011 of light source 10 near light guide plate 20 sides 201, light source 10 is set to move closer to active display area territory ADA.Therefore, because light source 10 is set to core 2011 to side 201 little by little near active display area territory ADA, the brightness that can improve backlight assembly 700.Light guide plate 20 is fabricated to the ladder on the side 201 that is included in light guide plate 20.
The schematically illustrated decomposition diagram that comprises the exemplary display device of exemplary backlight assembly shown in Figure 1 of Figure 10.
Display device 1000 comprises display panel 900, be used for providing to display panel 900 backlight assembly 100 of light.For example, liquid crystal display (LCD) panel or non-light-emitting display panel can be used as display panel 900.Display panel 900 is electrically connected to printed circuit board (PCB) (PCB) 80 by flexible print circuit (FPC) film 41.Although FPC film 41 is discontinuous in Figure 10, the end of FPC film 41 is continuous basically.And, although coupling part 151 discontinuous shown in Figure 10, the end of coupling part 151 is continuous basically.Therefore, light source 10 (as shown in Figure 1) can receive drive signal from the coupling part 151 of PCB80.
Display panel 900 comprises the liquid crystal (not shown) of thin film transistor (TFT) (TFT) panel 43, color filter panel 45, injection between two panels 43 and 45.This TFT panel 43 is in the face of color filter panel 45 and have a plurality of with matrix form formation TFT thereon.The source terminal of TFT on the TFT panel 43 is connected to a plurality of data lines, and the gate terminal of TFT is connected to a plurality of gate lines.And by conduction and transparent material, for example a plurality of pixel electrodes of indium tin oxide (ITO) formation are connected to the drain electrode end of TFT.
The data line and the gate line of TFT panel 43 are connected to PCB80.Therefore, when electric signal when PCB80 imports, this electric signal is input to source terminal and the gate terminal of TFT.Each TFT opens or closes based on electric signal, so that the required electric signal of Pixel Information outputs to the drain electrode end of corresponding TFT.Integrated circuit (IC) chip 47 is installed on the TFT panel 43 and controls display panel 900.IC chip 47 produces a plurality of timing signals that are used for applying with pre-specified time data drive signal and gate drive signal, and the timing signal that applies generation to the data line and the gate line of display panel 900.Passivation layer 49 be coated in IC chip 47 around so that protection IC chip 47.
Color filter panel 45 is arranged on the TFT panel 43.Color filter 45 is to have the substrate that a plurality of colour elements that limited by color filter are R, G, B pixel, and it forms and transmit light by processing film, so that show predetermined color.ITO or other transparent, conductive material are coated on the whole surface of color filter panel 45 to form public electrode.When energy is fed to the gate terminal of TFT and source terminal so that when opening TFT, between the pixel electrode of color filter substrate and public electrode, form electric field.This electric field changes the orientation angle of the liquid crystal that injects between TFT panel 43 and color filter panel 45, and changes the transmissivity of liquid crystal according to the orientation angle that changes, so obtains the pixel of expectation.The polarizer (not shown) is connected to two surfaces of display panel 900 and the polarization light by display panel 900.
Display panel 900 is fixed on the backlight assembly 100, and the 3rd retaining element 90 covers display panel 900.The 3rd retaining element 90 is attached on first retaining element 60 and adheres to a side of second retaining element 70.Therefore, display device 1000 can firmly receive display panel 900, and PCB80 is arranged on below second retaining element 70.
Comprise backlight assembly 100 although described display device 1000, this display device 1000 can comprise the backlight assembly of any other above-mentioned exemplary embodiment selectively, perhaps its combination arbitrarily.
As mentioned above, light source is provided with effectively so that the core in the viewing area improves brightness.As a result, can improve visuality and obtain high-resolution picture screen.
Though combination is thought enforceable exemplary embodiment at present and has been described the present invention, be appreciated that the present invention is not restricted to the disclosed embodiments, but opposite, it wants to cover various distortion and of equal value setting the in the spirit and scope that are included in accessory claim.
The application requires respectively on January 22nd, 2007 and the korean patent application 10-2007-0006575 of submission on March 12nd, 2007 and the right of priority of 10-2007-0023960, and its content whole in this combination as a reference.

Claims (25)

1. backlight assembly comprises:
Printed circuit board (PCB);
Be installed on the printed circuit board (PCB) upper surface and have a plurality of light sources of light-emitting area; With
Guiding is from the light guide plate of the light of light emitted,
Wherein, the light-emitting area of light source is substantially perpendicular to the upper surface of printed circuit board (PCB) and faces a side of light guide plate,
This side of light guide plate comprises core,
Light source comprises first light source that is arranged on the light guide plate core as first group, and the secondary light source of second group of contiguous first group conduct, and
The spacing of first light source is less than the spacing of secondary light source.
2. backlight assembly as claimed in claim 1, wherein the light of launching from light-emitting area is directly incident on this side of light guide plate.
3. backlight assembly as claimed in claim 2 further comprises the viewing area from source emissioning light, and
Wherein first mean distance between first light source and the viewing area is less than second mean distance between secondary light source and the viewing area.
4. backlight assembly as claimed in claim 3, wherein the distance between first light source and the viewing area is substantially the same.
5. backlight assembly as claimed in claim 3, wherein the distance between secondary light source and the viewing area is with reducing near core.
6. backlight assembly as claimed in claim 5, wherein light guide plate comprises at least one pressing part, first light source is provided with corresponding to this at least one pressing part.
7. backlight assembly as claimed in claim 6, wherein this at least one pressing part comprises a plurality of pressing parts, and these a plurality of pressing parts become gradually near the viewing area to core.
8. backlight assembly as claimed in claim 3, wherein second mean distance arrives in about 0.5 the scope about 0.2 the ratio of the average headway of secondary light source.
9. backlight assembly as claimed in claim 8, wherein second mean distance is about 0.3 to the ratio of the average headway of secondary light source.
10. backlight assembly as claimed in claim 1, wherein the distance between the adjacent light source is with reducing gradually near core.
11. as the backlight assembly of claim 10, wherein light source is symmetrical arranged with respect to the core minute surface.
12. backlight assembly as claimed in claim 1, wherein light source further comprises the 3rd light source as the 3rd group,
Wherein first group is arranged between second group and the 3rd group, and the summation of second group and the 3rd group light source is an even number.
13. as the backlight assembly of claim 12, wherein the number of secondary light source equals the number of the 3rd light source.
14. backlight assembly as claimed in claim 1, wherein the spacing of secondary light source is even basically.
15. as the backlight assembly of claim 14, wherein the spacing of first light source is even basically.
16. backlight assembly as claimed in claim 1, wherein light guide plate comprises two sides, and these two sides face with each other or continuously, at least one side of these two sides is in the face of first light source and secondary light source.
17. backlight assembly as claimed in claim 1, wherein light guide plate comprises at least one surface with catoptrical a plurality of patterns, and this pattern is with forming more thick and fast near core.
18. backlight assembly as claimed in claim 1, wherein light source is a light emitting diode.
19. backlight assembly as claimed in claim 1, wherein the largest interval between first light source is less than the largest interval between the secondary light source.
20. the backlight assembly with luminous viewing area, this backlight assembly comprises:
A plurality of light sources; And
Guiding is from the light guide plate of the light of light emitted,
Wherein light source is corresponding to a side setting of light guide plate, and this side comprises core, and
This light source is provided with even interval, and the distance between light source and the viewing area is with reducing gradually near core.
21. as the backlight assembly of claim 20, wherein this side comprises at least one pressing part, light source is provided with corresponding to this at least one pressing part.
22. a display device comprises:
The display panel of display image;
Be installed on the printed circuit board (PCB) upper surface and a plurality of light sources of light are provided to display panel; And guide from the light guide plate of the light of light emitted,
Wherein, light source has the light-emitting area that is substantially perpendicular to the printed circuit board (PCB) upper surface,
Light-emitting area is faced the side surface of light guide plate,
The side surface of light guide plate comprises core,
Light source comprises first light source that is arranged on the light guide plate core as first group, and the secondary light source of second group of contiguous first group conduct, and
The spacing of first light source is less than the spacing of secondary light source.
23. as the backlight assembly of claim 22, wherein the distance between the adjacent light source is with reducing near core.
24. the backlight assembly as claim 22 further comprises:
At least one is provided at the reflecting element below the light guide plate;
At least one is arranged on the optical sheet on the light guide plate; And
At least one receives the retaining element of light guide plate and light source.
25. a method that improves the display screen visuality, this display screen has backlight assembly, and this backlight assembly has the viewing area, and this method comprises:
Contiguous light guide plate one side is provided with a plurality of light sources, and this side comprises core, and first light source in the group of winning is arranged on the core of light guide plate, second group of contiguous first group of setting of interior secondary light source;
Wherein, be provided with a plurality of light sources comprise following at least one: first light source have than the closely spaced spacing of secondary light source is set, and first light source is set, this first light source apart from first mean distance of viewing area less than second mean distance between secondary light source and the viewing area.
CN2008100920573A 2007-01-22 2008-01-22 Backlight assembly, display device provided with the same, and method thereof Expired - Fee Related CN101246281B (en)

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