CN1881031A

CN1881031A - Backlight assembly, display device comprising same and method thereof

Info

Publication number: CN1881031A
Application number: CNA2006100927075A
Authority: CN
Inventors: 金在光; 周荣备; 金东哲; 金奎锡; 金成敏; 金正洙; 金炯杰; 李相熙; 吴晶锡; 车载禄
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Display Co Ltd
Priority date: 2005-06-13
Filing date: 2006-06-12
Publication date: 2006-12-20
Anticipated expiration: 2026-06-12
Also published as: CN1881031B; KR20060129831A; CN101655633A

Abstract

A backlight assembly supplies a guided light to a display panel having a main display part on which a main image is selectively displayed, and a sub display part on which a sub image is constantly displayed. The backlight assembly includes a light source and a light guiding unit. The light source generates a light. The light guiding unit includes a light incident surface, a light exiting surface, and a corresponding surface. The light from the light source is incident into the light incident surface. The light exiting surface has a main region and a sub region, the sub region having an optical pattern increasing a luminance of the light. The guided light exits the light exiting surface. The corresponding surface corresponds to the light exiting surface. A luminance uniformity and a luminance when viewed on a plane are increased.

Description

Backlight assembly, display device and method thereof with it

Technical field

The present invention relates to a kind of backlight assembly, have the display device and the method thereof of this backlight assembly.More specifically, the present invention relates to a kind of backlight assembly, a kind of method that can increase brightness uniformity and the brightness when the plane is watched with brightness of the display device of this backlight assembly and a kind of control is provided light by this backlight assembly display panel.

Background technology

Usually, liquid crystal display (" LCD ") equipment is used to personal computer, notebook, automated navigation system, television receiver etc.The electrical signal conversion that LCD equipment will have image information is an image.LCD equipment has various characteristics, for example light weight structure, small size, minimal thickness, low-power consumption etc.

In mobile LCD equipment, LCD equipment is divided into main display part and sub-display part, to improve optical characteristics and to reduce power consumption.For example, in the selection mode drive pattern, in sub-display part, show for example supplementary of time, date, battery status etc., and in main display part, show for example main information of image, character etc.In the steady state drive pattern, only in sub-display part, show supplementary, and close main display part.

LCD equipment is non-radial pattern display device, therefore also needs light source, for example backlight assembly except display panel.The light that use produces from light source, display message on main display part and sub-display part.

Backlight assembly needs bigger power consumption.In order to reduce the power consumption of backlight assembly, in the steady state pattern, reduce the brightness of backlight assembly, thereby reduced the image displaying quality of shown image on the sub-display part.

When the brightness that increases backlight assembly when improving image displaying quality, increased the power consumption of backlight assembly equally.

Summary of the invention

Example embodiment of the present invention provides a kind of backlight assembly, can increase brightness uniformity and the brightness when the plane is watched.

Example embodiment of the present invention also provides a kind of display device, has above-mentioned backlight assembly.

Example embodiment of the present invention also provides the method for a kind of control from the brightness of the display panel of above-mentioned backlight assembly reception light.

The backlight assembly of example embodiment provides direct light to display panel according to the present invention, and wherein display panel comprises main display part that optionally shows master image and the sub-display part that shows subimage consistently.Backlight assembly comprises light source and light guidance unit.Light source produces light.The light guidance unit comprises light incident surface, light exit surface and respective surfaces.Light from light source incides light incident surface.Light exit surface has main areas and subregion, and subregion has the optical pattern of increase from the brightness of the light of light source.Direct light is from the light exit surface outgoing.Respective surfaces is corresponding to light exit surface.

Optical pattern can comprise a plurality of first prisms or a plurality of protruding pattern.Described a plurality of first prism can be essentially triangle.Can on respective surfaces, form light scattering pattern or a plurality of second prism.With the corresponding light scattering pattern of main areas can have than with the low density of the corresponding light scattering pattern of subregion.The main areas of light exit surface can have smooth in fact surface.Main areas can be adjacent with light incident surface, subregion can with light incident surface away from.Respective surfaces can be a light reflective surface.

The backlight assembly of example embodiment provides light to display panel according to the present invention, and wherein display panel has main display part that optionally shows master image and the sub-display part that shows subimage consistently.Backlight assembly comprises light source, light guidance unit, first optical sheet and second optical sheet.Light source produces light.The light guidance unit comprises that the light from light source incides light incident surface wherein and has main areas and the light exit surface of subregion, and direct light is from the light exit surface outgoing.First optical sheet by the first brightness increment rate, makes from the brightness increase of the direct light of main areas outgoing on main areas.Second optical sheet by the second brightness increment rate greater than the first brightness increment rate, makes from the brightness increase of the direct light of subregion outgoing on subregion.

First optical sheet can also cover subregion, and second optical sheet can be overlapping with first optical sheet.Second optical sheet can comprise double brightness enhancement film or brightness enhancement sheet.

The backlight assembly of another example embodiment provides direct light to display panel according to the present invention, and wherein display panel comprises main display part that optionally shows master image and the sub-display part that shows subimage consistently.Backlight assembly comprises first light source, secondary light source and light guidance unit.First light source produces first light in the selection mode drive pattern, and adjacent with main display part.Secondary light source produces second light in the steady state drive pattern, and adjacent with sub-display part.The light guidance unit guides first and second light, to provide direct light to display panel.

Each can comprise light emitting diode (" LED ") first and second light sources.The light guidance unit can comprise: light exit surface, comprise with the corresponding main areas in main display part and with the corresponding subregion in sub-viewing area; First side links to each other with main areas, and adjacent with first light source; And second side, link to each other with subregion, and adjacent with secondary light source.The light guidance unit can comprise: the key light guided plate, and corresponding with main display part, and adjacent with first light source; And sub-light guide plate, corresponding with sub-display part, and adjacent with secondary light source.

The display device of example embodiment comprises light source, light guidance unit and display panel according to the present invention.Light source produces light.The light guidance unit comprises light incident surface and light exit surface.Light incides light incident surface.Light exit surface has main areas and subregion, and subregion has the optical pattern of the brightness that increases light.Direct light is from the light exit surface outgoing.Display panel has according to the direct light from the main areas outgoing of light exit surface and shows the main display part of master image and the sub-display part that shows subimage according to the direct light from the subregion outgoing of light exit surface.

The display device of example embodiment comprises light source, light guidance unit, first optical sheet, second optical sheet and display panel according to the present invention.Light source produces light.The light guidance unit comprises that light incides light incident surface wherein and has main areas and the light exit surface of subregion, and direct light is from the light exit surface outgoing.First optical sheet by the first brightness increment rate, makes from the brightness increase of the direct light of the subregion outgoing of advocating peace on the subregion of advocating peace.Second optical sheet by the second brightness increment rate greater than the first brightness increment rate, makes from the brightness increase of the direct light of subregion outgoing on subregion.Display panel has according to the direct light from the main areas outgoing of light exit surface and shows the main display part of master image and the sub-display part that shows subimage according to the direct light from the subregion outgoing of light exit surface.

The display device of another example embodiment comprises display panel, backlight assembly and driving circuit according to the present invention.Display panel comprises main display part that optionally shows master image and the sub-display part that shows subimage consistently.Backlight assembly comprises first light source, secondary light source and light guidance unit.First light source is adjacent with main display part, and produces first light.Secondary light source is adjacent with sub-display part, and produces second light.The light guidance unit guides first and second light to display panel.Driving circuit section provides electric power in the selection mode drive pattern first light source, provides electric power to secondary light source in the steady state drive pattern.

The display device of another example embodiment comprises display panel, backlight assembly and driving circuit according to the present invention.Display panel comprises main display part that optionally shows master image and the sub-display part that shows subimage consistently.Backlight assembly comprises pointolite and light guidance unit.Pointolite is adjacent with sub-display part, and produces light.The light guidance unit is to the display panel direct light.Driving circuit section provides first electric power to pointolite in the selection mode drive pattern, provide second electric power to pointolite in the steady state drive pattern.

Driving circuit section can be electrically connected with display panel, and driving circuit section can provide first drive signal with the demonstration master image to display panel in the selection mode drive pattern, and provides second drive signal to show subimage to display panel in the steady state drive pattern.

The method that a kind of control of example embodiment has the brightness in the display panel of sub-display part and main display part according to the present invention comprises: the subregion with respect to the light guidance unit in the backlight assembly is provided with brightness enhancement elements; And the power consumption of backlight assembly first level during the selection mode drive pattern is reduced to second level during the steady state drive pattern, wherein, during the steady state drive pattern, do not reduce the brightness of sub-display part in fact.

The step that brightness enhancement elements is set can comprise: on the subregion of light guidance unit and do not form optical pattern on main areas; With the corresponding zone of the subregion of light guidance unit in and not with the corresponding zone of the main areas of light guidance unit in place second optical sheet, perhaps light source is set at subregion adjacent with the light guidance unit.Be provided with under the situation of light source, this method can also comprise: provide first electric power to light source in the selection mode drive pattern; And in the steady state drive pattern, provide the second lower electric power to light source.Can also light source be set at main areas adjacent with the light guidance unit, and this method can also comprise: first electric power is provided for during the selection mode drive pattern light source adjacent with main areas, and second electric power is provided for during the steady state drive pattern light source adjacent with subregion.

According to the present invention, increased the brightness of subregion in the steady state drive pattern.Therefore, reduce the power consumption of backlight assembly and display device, and improved the image displaying quality of subregion.

Description of drawings

By describing example embodiment of the present invention with reference to the accompanying drawings in detail, above other advantage that reaches of the present invention will become apparent, in the accompanying drawing:

Fig. 1 shows the sectional view of the demonstration backlight assembly of the example embodiment according to the present invention;

Fig. 2 shows the sectional view of the demonstration backlight assembly of another example embodiment according to the present invention;

Fig. 3 shows the sectional view of the demonstration backlight assembly of another example embodiment according to the present invention;

Fig. 4 shows the sectional view of the demonstration backlight assembly of another example embodiment according to the present invention;

Fig. 5 shows the decomposition diagram of the demonstration backlight assembly of another example embodiment according to the present invention;

Fig. 6 is the sectional view that is obtained along line I-I ' shown in Figure 5;

Fig. 7 shows the decomposition diagram of the demonstration backlight assembly of another example embodiment according to the present invention;

Fig. 8 shows the skeleton view of the demonstration backlight assembly of another example embodiment according to the present invention;

Fig. 9 A shows in the selection mode drive pattern sequential chart of the drive signal that first and second diodes to the demonstration backlight assembly of Fig. 8 apply;

Fig. 9 B shows in the selection mode drive pattern along the figure of the brightness of the light of the light guidance unit of the example embodiment of passing through backlight assembly of the line II-II ' measurement of Fig. 8;

Figure 10 A shows in the steady state drive pattern sequential chart of the drive signal that first and second diodes to the example embodiment of the backlight assembly of Fig. 8 apply;

Figure 10 B shows in the steady state drive pattern along the figure of the brightness of the light of the light guidance unit of the example embodiment of passing through backlight assembly of the line II-II ' measurement of Fig. 8;

Figure 11 shows the skeleton view of the demonstration backlight assembly of another example embodiment according to the present invention;

Figure 12 shows the decomposition diagram of the example embodiment of backlight assembly shown in Figure 11;

Figure 13 is the sectional view that is obtained along line III-III ' shown in Figure 12;

Figure 14 shows the decomposition diagram of the demonstration backlight assembly of another example embodiment according to the present invention;

Figure 15 is the sectional view that is obtained along line IV-IV ' shown in Figure 14;

Figure 16 shows the sectional view of the demonstration display device of another example embodiment according to the present invention;

Figure 17 shows the decomposition diagram of the demonstration display device of another example embodiment according to the present invention;

Figure 18 is the sectional view that is obtained along line V-V ' shown in Figure 17;

Figure 19 shows the skeleton view of the demonstration display device of another example embodiment according to the present invention;

Figure 20 shows the decomposition diagram of the example embodiment of display device shown in Figure 19;

Figure 21 is the sectional view that is obtained along line VI-VI ' shown in Figure 20;

Figure 22 shows the decomposition diagram of the demonstration display device of another example embodiment according to the present invention;

Figure 23 is the sectional view that is obtained along line VII-VII ' shown in Figure 22;

Figure 24 shows the decomposition diagram of the demonstration display device of another example embodiment according to the present invention;

Figure 25 is the sectional view that is obtained along line VIII-VIII ' shown in Figure 24;

Figure 26 A and 26B show and are applied to the demonstrate drive signal of light emitting diode (" LED ") and the figure of the relation between the power consumption;

Figure 27 A shows main areas when demonstration LED and the light guidance unit figure from the brightness of the light of the light guidance unit outgoing of demonstrating when adjacent;

Figure 27 B shows subregion when demonstration LED and the light guidance unit figure from the brightness of the light of the light guidance unit outgoing of demonstrating when adjacent.

Embodiment

Below with reference to the accompanying drawing that wherein shows the embodiment of the invention the present invention is described more completely.Yet the present invention can be with multiple multi-form realization, and should not be construed as limited to illustrated embodiment herein.And provide these embodiment, so that make the disclosure detailed and complete, and intactly disclose scope of the present invention to those skilled in the art.In the accompanying drawings, for clear, can amplification layer and regional size and relative size.

Be appreciated that when element or layer be called as another element or layer " on ", " being attached thereto " or " coupling " with it, it can be directly on another element or layer, directly be attached thereto or be coupled, perhaps can have element or layer between two parties.On the contrary, when element or layer is called as and another element or layer " directly on it ", " directly being attached thereto " or " directly coupling with it ", then there are not element or layer between two parties.In full, similarly label is represented similar elements.As used herein, term " and/or " comprise relevant list one or more arbitrarily and all combinations.

Although be appreciated that the term first, second, third, etc. can be used to describe various elements, parts, zone, layer and/or part herein, these elements, parts, zone, layer and/or part are not subject to these terms.These terms only are used for distinguishing mutually element, parts, zone, layer or a part.Therefore, first element, parts, zone, layer or the part of discussing below can be called second element, parts, zone, layer or part, and not break away from instruction of the present invention.

In order to be easy to explanation, use space relative terms such as " below ", " following " " lower floor ", " top ", " upper strata " for example to describe the relation as shown in the figure of an element or feature and another element or feature herein.Be appreciated that except orientation shown in the drawings the space relative terms also should comprise other orientation of equipment in use or the operation.For example, if the equipment in the flipchart, then be described as other element or feature " below " or the element of " below " will be oriented to other element or feature " above ".Therefore, exemplary term " following " can comprise top and following orientation.Equipment can also be other orientation (revolve turn 90 degrees or towards other direction), and correspondingly explains space as used herein relative descriptors.

Term as used herein only is to be used to describe specific embodiment, should be as restriction of the present invention.As used herein, singulative " ", " a kind of " and " that " also should comprise plural form, unless context indicates clearly.Should also be appreciated that, when using in this manual, term " comprises " and/or " comprising " specifies the existence of feature, integral body, step, operation, element and/or the parts of being explained, but does not get rid of the existence or the interpolation of its one or more further features, integral body, step, operation, element, parts and/or their group.

Reference is herein described embodiments of the invention as the sectional view of the synoptic diagram of desirable embodiment of the present invention (and intermediate structure).Similarly, for example can estimate since manufacturing technology and/or tolerance and from shown in the variation that produces the shape.Therefore, should not be considered as embodiments of the invention and be confined to specific region shape shown here, but should comprise for example owing to making the form variations that produces.For example, the implantation zone that is depicted as rectangle can have circle or bending features usually, and/or has the gradient of implant concentration at its edge, rather than changes from being implanted to the non-binary of implanting the zone.Similarly, can cause in the zone between the buried region and the surface of implanting some implantation being arranged by implanting the buried region form by it.Therefore, zone shown in the drawings is schematically in essence, and its shape and be not intended to the true form in the zone of announcer spare, and and is not intended to limit the scope of the invention.

Unless having with those skilled in the art, special definition, all terms as used herein (comprising technology and scientific terminology) understand identical meaning usually.It is also understood that, those terms that for example define should be interpreted as the consistent meaning of meaning that has with in the correlation technique linguistic context in normally used dictionary, and should not understanding, unless clear and definite herein so definition according to idealized or too formal meaning.

Below, describe the present invention with reference to the accompanying drawings in detail.

Fig. 1 shows the sectional view of the demonstration backlight assembly of the example embodiment according to the present invention.

With reference to figure 1, backlight assembly 110 is comprised that the display panel (not shown) of main display part and sub-display part provides light.On main display part, optionally show master image.On sub-display part, show subimage consistently.Backlight assembly 110 comprises light source and light guidance unit 119.

In Fig. 1, light source comprises light emitting diode (" LED ") 111.Alternatively, light source can be fluorescent light or other suitable light source.The brightness uniformity of light emitting diode 111 and fluorescent light is all relatively poor, so backlight assembly 110 comprises that a plurality of optical units are to improve optical characteristics.

The light that light guidance unit 119 guiding produces from LED 111 or other light source, and the light that will put type or line style is changed into the light of surface type.Light guidance unit 119 comprises light incident surface 112, light exit surface 113 and the respective surfaces 115 relative with light exit surface 113.

The light that produces from LED 111 incides the light guidance unit 119 by light incident surface 112.The light that is guided by light guidance unit 119 passes through light exit surface 113 from 119 outgoing of light guidance unit.Light exit surface 113 comprises main areas MS and subregion SS.In Fig. 1, main areas MS is adjacent with light incident surface 112, and subregion SS separates with light incident surface 112.Main areas MS is parallel with subregion SS in fact.That is, main areas MS in fact with subregion SS coplane.Main areas MS places between light incident surface 112 and the subregion SS.Has flat surfaces with the part of the corresponding light exit surface 113 of main areas MS, for example plane or substantial plane.With the corresponding light exit surface 113 of subregion SS in form optical pattern 114, to increase and the corresponding brightness of subregion SS.That is, main areas and subregion MS and SS have the pattern that differs from one another.Respective surfaces 115 is corresponding to light exit surface 113.Light incident surface 112 links to each other light exit surface 113 with respective surfaces 115.

Light guidance unit 119 is essentially the constant in fact writing board shape of thickness.Alternatively, light guidance unit 119 can be wedge shape.In wedge shape, along with the distance with light incident surface 112 increases, the thickness of light guidance unit 119 reduces.Therefore, in wedge shape, be thinner than the thickness of the light guidance unit 119 among the main areas MS near the thickness of the light guidance unit 119 of subregion SS.

Light guidance unit 119 can comprise have for example higher light transmission, better heat-resisting, the light guiding material of the various characteristics of chemical resistance, higher physical strength, higher light diffusing etc. preferably.Light guidance unit 119 can comprise a plurality of particles in matrix (matrix) and the matrix.The examples of materials that can be used as the matrix of light guidance unit 119 comprises polymethylmethacrylate, polyamide, polyimide, polypropylene, polyurethane etc.The particle of light guidance unit 119 can be transparent.Alternatively, light guidance unit 119 can comprise based on allyl resin.

Optical pattern 114 can form as one with light guidance unit 119 in subregion SS.Particularly, optical pattern 114 can have a plurality of first prisms of the triangular cross-sectional shape of being essentially.First prism is arranged with constant space.First prism is parallel to each other in fact.First prism in fact can be parallel with one side of light guidance unit 119.Alternatively, each first prism can have fillet.Can form first prism by the demoulding (extraction) technology, moulding process etc., win prism and light guidance unit 119 are formed as one.Alternatively, first prism can also be printed onto on the light guidance unit 119.

Incide light repeated reflection between respective surfaces 115 and light exit surface 113 in the light guidance unit 119 by light incident surface 112, make light incide the end of light guidance unit 119.The luminance brightness that incides light guidance unit 119 reduces during repeated reflection.That is, the light among the light ratio subregion SS among the main areas MS has lower loss.From the emergence angle of the light of main areas MS outgoing with respect to vertical with the light exit surface 113 of light guidance unit 119 in fact normal direction form about 75 ° to about 83 ° angle.

Light from the light ratio of main areas MS outgoing from subregion SS outgoing has low loss, and therefore the brightness from the light of subregion SS outgoing is lower than from the brightness of the light of main areas MS outgoing.

Optical pattern 114 guides the light from light exit surface 113 outgoing in the subregion SS of light guidance unit 119, make to increase the brightness of the subregion SS when the plane is watched.Therefore, have in fact and the identical brightness of light from the light of subregion SS outgoing from main areas MS outgoing.

Backlight assembly 110 comprises selection mode drive pattern and steady state drive pattern.The steady state drive pattern has low power consumption than selection mode drive pattern.In the steady state drive pattern, the electric power that is applied to LED 111 is less, so the brightness of LED 111 is lower, thereby has reduced the brightness of the image that shows in subregion SS.

Yet in Fig. 1, optical pattern among the subregion SS 114 increases the brightness when the plane is watched, to be increased in the brightness of the image that shows among the subregion SS.Therefore, optical pattern 114 will be converted to the light that display device was suitable for of drive from the light of subregion SS emission, thereby improve the image displaying quality among the subregion SS.

Fig. 2 shows the sectional view of the demonstration backlight assembly 130 of another example embodiment according to the present invention.

The backlight assembly 130 of Fig. 2 in fact with Fig. 1 in identical, except light guidance unit 139.Therefore, omit about with the further explanation of the described identical or similar part of Fig. 1.

With reference to figure 2, the light guidance unit 139 light guidance unit 119 with Fig. 1 in fact is identical, except forming the light scattering pattern 138 in addition on the respective surfaces 135 of light guidance unit 139.

Light scattering pattern 138 is a plurality of somes shapes.For example, light scattering pattern 138 can have protruding pattern.Incide light repeated reflection between respective surfaces 135 and light exit surface 133 of light guidance unit 139 by light incident surface 132 from optical surface 131, make light pass through light guidance unit 139, towards the subregion SS propagation of light guidance unit 139.The brightness of inciding the light of light guidance unit 139 reduces during repeated reflection.Light scattering pattern 138 reduces from the light emergence angle of the light of subregion SS outgoing, to increase the brightness of subregion SS.Light passes through optical pattern 134 from subregion SS outgoing.

Can form light scattering pattern 138 by the mechanical technology of for example typography and so on.For example, the some shape of light scattering pattern 138 can have about ten microns to 100 microns all size.Can in main areas and subregion MS and SS, form light scattering pattern 138.The light scattering pattern 138a of main areas MS can have the low density of light scattering pattern 138b than subregion SS.

Can regulate the light scattering pattern 138 among main areas and subregion MS and the SS, with the brightness among control main areas and subregion MS and the SS.For example, the size of the some shape of the light scattering pattern 138a among the main areas MS and density are less than the size and the density of the some shape of the light scattering pattern 138b among the subregion SS.

Therefore, by the optical loss among the light scattering pattern 138 compensation subregion SS, to improve the brightness uniformity of backlight assembly 130.

Fig. 3 shows the sectional view of the demonstration backlight assembly 150 of another example embodiment according to the present invention.

The backlight assembly 150 of Fig. 3 is identical with Fig. 1 in fact, and light guidance unit 159 different with the optical pattern of light guidance unit 119 comprises the light scattering pattern 138 similar light scattering patterns 158 with Fig. 2 except the shape of the optical pattern 154 of light guidance unit 159.Therefore, omit about with the further explanation of the described identical or similar part of Fig. 1.

With reference to figure 3, on the light exit surface 153 of light guidance unit 159, form optical pattern 154.Light from light source 151 incides on the light incident surface 152 of light guidance unit 159, and repeated reflection between respective surfaces 155 and light exit surface 153.Light scattering pattern 158 reduces from the light emergence angle of the light of subregion SS outgoing, to increase the brightness of subregion SS.The light scattering pattern 158a of main areas MS has the low density of light scattering pattern 158b than subregion SS.Light passes through optical pattern 154 from subregion SS outgoing.Optical pattern 154 is a plurality of somes shapes.For example, optical pattern 154 can have protruding pattern.

Each some shape of optical pattern 154 is as convex lens, to increase the brightness of subregion SS when the plane is watched.Can after making light guidance unit 159, on subregion SS, form optical pattern 154 by typography by moulding process.

Each some shape can have semi-circular section or semi-elliptical cross-section in fact.In Fig. 3, the center of gravity of each some shape can to put the summit of shape corresponding with each, to increase the brightness when the plane is watched.In Fig. 3, each some shape is outstanding from light exit surface 153.Alternatively, each some shape can fall in from light exit surface 153.

Fig. 4 shows the sectional view of the demonstration backlight assembly 170 of another example embodiment according to the present invention.

The backlight assembly 170 of Fig. 4 is identical with Fig. 1 in fact, except strengthening the pattern 178 forming brightness on the respective surfaces 175 of light guidance unit 179 in addition.Therefore, omit about with the further explanation of the described identical or similar part of Fig. 1.

With reference to figure 4, on the respective surfaces 175 of light guidance unit 179, form brightness and strengthen pattern 178.Optical pattern 174 comprises a plurality of first prisms, and brightness enhancing pattern 178 comprises a plurality of second prisms.Each second prism is can be from the respective surfaces relative with the light exit surface 173 of light guidance unit 179 175 outstanding or fall in.Brightness strengthens pattern 178 incides the incidence surface 172 of light guidance unit 179 from light from light source 171 to the guiding of the front of backlight assembly 170.

Second prism that brightness among the main areas MS strengthens pattern 178 has the low spacing of second prism that strengthens pattern 178 than the brightness among the subregion SS.

Fig. 5 shows the decomposition diagram of the demonstration backlight assembly of another example embodiment according to the present invention.Fig. 6 is the sectional view that is obtained along line I-I ' shown in Figure 5.

With reference to figure 5 and 6, backlight assembly 300 comprises light source 310, light guidance unit 330, first optical sheet 360 and second optical sheet 370.

Fig. 5 and 6 light source 310 can be with identical with reference to the described LED of figure 1 111.Therefore, omission is about the further explanation of light source 310.

The light that light guidance unit 330 guiding produces from the LED of light source 310, and the light that will put type or line style is changed into the light of surface type.Light guidance unit 330 comprises light incident surface 331, light exit surface 333 and respective surfaces 335.

The light that produces from the LED of light source 310 incides light guidance unit 330 by light incident surface 331.Light by 330 guiding of light guidance unit passes through light exit surface 333 from 330 outgoing of light guidance unit.Light exit surface 333 comprises main areas MS and subregion SS.Main areas MS is adjacent with subregion SS, and subregion SS is parallel with main areas MS in fact.That is, main areas MS in fact can with subregion SS coplane.Respective surfaces 335 is relatively corresponding to light exit surface 333.In Fig. 5 and 6, light guidance unit 330 is essentially even shape.

First optical sheet 360 covers advocate peace subregion MS and SS, to improve by the optical characteristics of light exit surface 333 from the light of light guidance unit 330 outgoing, and for example brightness uniformity, the brightness when the plane is watched etc.The brightness increment rate is incident light brightness and the ratio of emergent light brightness.First optical sheet 360 has the first brightness increment rate.In Fig. 5 and 6, first optical sheet 360 is positioned on advocate peace subregion MS and the SS.Alternatively, first optical sheet 360 can only be positioned on the main areas MS.First optical sheet 360 comprises diffusion disk 361 and brightness enhancement sheet 363.

Diffusion disk 361 can be between light guidance unit 330 and brightness enhancement sheet 363, and diffusion is from the light of advocate peace the subregion MS and the SS outgoing of light guidance unit 330, to increase the brightness of light.Diffusion disk 361 comprises matrix, a plurality of diffusion pearl (not shown) and binder.The diffusion pearl is on the matrix, with diffused light.The diffusion pearl is attached to matrix by binder.Alternatively, the diffusion pearl can be in the matrix, for example is integrated in wherein.

Brightness enhancement sheet 363 is on diffusion disk 361.Brightness enhancement sheet 363 increases the brightness of the light when the plane is watched.On brightness enhancement sheet 363, form a plurality of prisms.The prism of brightness enhancement sheet 363 is parallel to each other in fact.Each prism vertically vertical with light incident surface 331 in fact.In other words, the prism of brightness enhancement sheet 363 extends along extending to the parallel direction of the direction of a relative side with light incident surface 331 from light guidance unit 330.

That is, brightness enhancement sheet 363 has the irregular surface that comprises protuberance and groove.When brightness enhancement sheet 363 had prism, brightness enhancement sheet 363 was to the front of backlight assembly 300 direct light, and increased the brightness of the light when the plane is watched.

First optical sheet 360 can also comprise reflector plate 367 and screening glass 365.Reflector plate 367 is on the respective surfaces 335 of light guidance unit 330, and therefore a part of light that leaks from respective surfaces 335 reflects from reflector plate 367, turns back to light guidance unit 330, thereby has increased the brightness of backlight assembly 300.Reflector plate 367 can comprise high reflecting material.

Screening glass 365 is avoided scratching in order to protection brightness enhancement sheet 363 on brightness enhancement sheet 363.

Second optical sheet 370 places between brightness enhancement sheet 363 and the screening glass 365, and SS is corresponding with subregion, but be not in the corresponding zone of main areas MS in.Second optical sheet 370 increases from the brightness of the light of subregion SS outgoing.Second optical sheet 370 has the second brightness increment rate bigger than the first brightness increment rate of first optical sheet 360.

In Fig. 5 and 6, second optical sheet 370 for example comprises that the brightness that makes that the 3M company by the U.S. is provided strengthens the double brightness enhancement film (" DBEF ") of twice.

The light that incides second optical sheet 370 comprises P ripple part and S ripple part.Second optical sheet 370 changes the direction of vibration of S ripple part, makes P ripple and S ripple part vibrate along equidirectional in fact.The polarizer (not shown) only sees through P ripple part, and stops S ripple part, reduces the brightness of backlight assembly 300.Yet although incide the polarizer (not shown) by the light of second optical sheet 370, second optical sheet 370 changes the direction of vibration of S ripple part, to increase the brightness of backlight assembly 300.Compare with the backlight assembly that does not have second optical sheet 370, the brightness of subregion SS with backlight assembly 300 of second optical sheet 370 can increase twice.

Backlight assembly 300 can be as the light generation unit of the display device with display panel (not shown).The display panel (not shown) can comprise the polarizer (not shown).In addition, the display panel (not shown) can have with the corresponding main display part of main areas MS and with the corresponding sub-display part of subregion SS.

In the steady state drive pattern, backlight assembly 300 is to be lower than the electric power work during the selection mode drive pattern.That is, the LED of light source 310 to be lower than the electric power work during the selection mode drive pattern, has therefore reduced the brightness of backlight assembly 300, thereby has reduced the image displaying quality in the steady state drive pattern in the steady state drive pattern.

Yet in Fig. 5 and 6, second optical sheet 370 is positioned on the subregion SS, increasing the brightness of subregion SS, thereby has increased the image displaying quality of the subregion SS in the steady state drive pattern.

Fig. 7 shows the decomposition diagram of the demonstration backlight assembly 400 of another example embodiment according to the present invention.

The backlight assembly 400 of Fig. 7 is identical with Fig. 5 and 6 in fact, except the light guidance unit 430 and second optical sheet 470.Therefore, omit about with the further explanation of Fig. 5 and 6 described identical or similar parts.

With reference to figure 7, light guidance unit 430 is a wedge shape.That is, along with the distance with the light incident surface 431 of light guidance unit 430 increases, the thickness of light guidance unit 430 reduces.From the light direct beam of light source 410 to light incident surface 431.Owing to be wedge shape, light exit surface 433 and respective surfaces 435 are not parallel each other, and are being separated by fartherly near light incident surface 431 places, and are locating to be separated by nearer near end relative with light incident surface 431 in the light guidance unit 430.In Fig. 7, light guidance unit 430 is a wedge shape, to increase the brightness of backlight assembly 400.Reflector plate 467 can be positioned under the respective surfaces 435, as shown in the figure.

Second optical sheet 470 is on the brightness enhancement sheet 463 of first optical sheet 460, under the screening glass 465, and SS is corresponding with subregion.Second optical sheet 470 increases from the brightness of the light of subregion SS outgoing.

Second optical sheet 470 comprises a plurality of prisms.Prism is parallel to each other in fact.The prism of second optical sheet 470 prism with brightness enhancement sheet 463 in fact is vertical.

Diffusion disk 461 and brightness enhancement sheet 463 at first increase the brightness when the plane is watched, and second optical sheet 470 increases the brightness of the subregion SS when the plane is watched then, thereby increase among the subregion SS brightness when the plane is watched.

Fig. 8 shows the skeleton view of the demonstration backlight assembly 500 of another example embodiment according to the present invention.

With reference to figure 8, backlight assembly 500 comprises first light source, secondary light source and light guidance unit 530.

First and second light sources comprise a LED 511 and the 2nd LED 513 respectively.Alternatively, first and second light sources can be respectively first fluorescent light and second fluorescent light.

In Fig. 8, backlight assembly 500 can also comprise power supply unit 517.In the selection mode drive pattern, power supply unit 517 provides electric current to first and second LED 511 and 513.In the steady state drive pattern, power supply unit 517 provides electric current to the 2nd LED 513, but does not provide electric current to a LED 511.

The one LED 511 produces light in the selection mode drive pattern, and does not produce light in the steady state drive pattern.The 2nd LED 513 can produce light in selection mode drive pattern and steady state drive pattern.Alternatively, the 2nd LED 513 can not produce light in the selection mode drive pattern.

Light guidance unit 530 is to the light of the front of backlight assembly 500 guiding from first and second LED511 and 513 generations.Light guidance unit 530 comprises light exit surface 531, first side 533, the 3rd side 537 that links to each other with second side 535 with first side, 533 second side surface opposite 535, with first side 533 and four side 539 relative with the 3rd side 537.First and second sides 533 and 535 can be parallel to each other, and third and fourth side 537 and 539 can be parallel to each other.Light exit surface 531 comprises main areas MS and subregion SS.Main areas MS and subregion SS have first area respectively and less than the second area of first area.Main areas MS is parallel with subregion SS along first direction (x direction) in fact.In other words, main areas MS in fact can with subregion SS coplane.

First side 533 links to each other with main areas MS along first direction.Second side 535 is corresponding with first side 533, and links to each other with subregion SS along first direction.The 3rd side 537 is along linking to each other with subregion SS with main areas MS with the vertical second direction (y direction) of first direction in fact.The 4th side 539 is corresponding with the 3rd side 537, and links to each other with subregion SS with main areas MS along second direction.Light guidance unit 530 can also comprise and light exit surface 531 corresponding respective surfaces (not shown).

In Fig. 8, two the one LED 511 are positioned on first side 533.The 2nd LED 513 be positioned at corresponding the 3rd side 537 of subregion SS on.Alternatively, can change the number and the position of first and second LED 511 and 513.For example, a LED 511 can with corresponding the 3rd side 537 of main areas MS on, and the 2nd LED 513 can be on second side 535.

Fig. 9 A shows in the selection mode drive pattern sequential chart of the drive signal that first and second diodes to the demonstration backlight assembly of Fig. 8 apply.Fig. 9 B shows in the selection mode drive pattern along the figure of the brightness of the light of the demonstration light guidance unit of the example embodiment of passing through backlight assembly of the line II-II ' measurement of Fig. 8.

With reference to figure 8,9A and 9B, in the selection mode drive pattern, each produces light the one LED DM1, DM2 (511 shown in Fig. 8) on first side 533, and the 2nd LED DS1 (513 shown in Fig. 8) with corresponding the 3rd side 537 of subregion SS on produce light.Light guidance unit 530 is to the light of the front of backlight assembly 500 guiding from the first and second LED DM1, DM2 and DS1 generation.By the light of light guidance unit 530 guiding from main areas MS and subregion SS outgoing.In the selection mode drive pattern, have identical brightness with light in fact, thereby increased the brightness uniformity of backlight assembly 500 from subregion SS outgoing from the light of main areas MS outgoing.

Figure 10 A shows in the steady state drive pattern sequential chart of the drive signal that first and second diodes to the example embodiment of the backlight assembly of Fig. 8 apply.Figure 10 B shows in the steady state drive pattern along the figure of the brightness of the light of the light guidance unit of the example embodiment of passing through backlight assembly of the line II-II ' measurement of Fig. 8.

With reference to figure 8,10A and 10B, in the steady state drive pattern, a LED DM1, DM2 (511 shown in Fig. 8) do not produce light, and the 2nd LED DS1 (513 shown in Fig. 8) only with corresponding the 3rd side 537 of subregion SS on produce light.The light that light guidance unit 530 produces from the 2nd LED DS1 to the guiding of the front of backlight assembly 500.In Figure 10 B, produce from the 2nd LED DS1, can ignore to the light of main areas MS guiding.The light that is guided by light guidance unit 530 is from subregion SS outgoing.

Therefore, in fact to subregion SS guiding all light from the 2nd LED DS1 generation, the brightness of subregion SS increases, although the electric current that applies to the 2nd LED DS1 (513 shown in Fig. 8) in the steady state pattern is less than the electric current that applies to the 2nd LED DS1 in the selection mode pattern.

Figure 11 shows the skeleton view of the demonstration backlight assembly 600 of another example embodiment according to the present invention.Figure 12 shows the decomposition diagram of the example embodiment of backlight assembly shown in Figure 11 600.

With reference to Figure 11 and 12, backlight assembly 600 comprises first light source, secondary light source and light guidance unit 640.

First and second light sources comprise a LED 611 and the 2nd LED 613 respectively.Figure 11 and 12 first and second light sources and light guidance unit are identical with Fig. 8's.Therefore, omission is about the further explanation of above element.

Backlight assembly 600 can also comprise power supply printed circuit film 615, power supply unit 617 and storage container 620.

First and

second LED

611 and 613 are electrically connected with power supply unit 617 by power supply printed circuit film 615.In Figure 11 and 12, power supply printed circuit film 615 is L shaped.The one LED611 can first attached to power supply printed circuit film 615 on, and the 2nd LED 613 can be attached on the second portion of power supply printed circuit film 615, wherein first and second parts can in fact be extended L shaped to form with being perpendicular to one another.First power lead and second source line are electrically connected with power supply printed circuit film 615.The one LED 611 is electrically connected with first power lead.The 2nd LED 613 is electrically connected with the second source line.

Figure 11 and 12 power supply unit are identical with Fig. 8's.Therefore, omission is about the further explanation of power supply unit 617.

In the selection mode drive pattern, power supply unit 617 provides electric current to a LED 611 and the 2nd LED 613.In the steady state drive pattern, power supply unit 617 provides electric current to the 2nd LED613, and does not provide electric current to a LED 611.

Figure 13 is the sectional view that is obtained along line III-III ' shown in Figure 12.

With reference to figures 11 to 13, storage container 620 comprises base plate 621, the first side wall 623, second sidewall 625, the 3rd sidewall 627 and the 4th sidewall 629.

Though do not illustrate, base plate 621 can have opening alternatively, to reduce the weight of backlight assembly 600.The first, second, third and the 4th sidewall 623,625,627 and 629 is given prominence to from the side of base plate 621.The first side wall 623 is relative and corresponding with second sidewall 625, and can be parallel to each other.The 3rd sidewall 627 is relative and corresponding with the 4th sidewall 629, and can be parallel to each other.Third and

fourth sidewall

627 and 629 each be connected between first and

second sidewalls

623 and 625.

Refer again to Figure 13, on the first side wall 623, form three first recesses 624, and form by with three holes of first recess, 624 corresponding base plate 621 peripheries.Although described three recesses 624 and corresponding hole,, optional number can be set for selectable number LED.On the 3rd sidewall 625, form the second hole (not shown), and form by with the hole of corresponding base plate 621 peripheries of the second hole (not shown).

The one LED 611 is inserted in each first recess 624 by the hole of base plate 621.The 2nd LED 613 inserts in the second recess (not shown) by the hole of base plate 621.

Outside surface along the first side wall 623 forms the first guiding recess and the second guiding recess on the first side wall 623.The part of power supply printed circuit film 615 is accommodated in the guiding recess, and as shown in figure 11, so power supply printed circuit film 615 is crooked and be electrically connected with power supply unit 617.

Light guidance unit 640 produces and incides light as first side 643 of first light incident surface to the guiding of the front of backlight assembly 600 from first and second LED611 and 613.In the selection mode drive pattern, light guidance unit 640 guides from first and

second LED

611 and 613 light that produce to the main display part and the sub-display part of display panel (not shown).In the steady state drive pattern, light guidance unit 640 produces and incides light as the 3rd side 647 of second light incident surface to the guiding of the sub-display part of display panel (not shown) from the 2nd LED 613.Second side 645 of light guidance unit 640 is relative with first side 643, and adjacent with its second sidewall 625 when light guidance unit 640 is accommodated in the storage container 620.

Backlight assembly 600 can also comprise optical sheet 650.

Optical sheet 650 improves from the optical characteristics of the light of light guidance unit 640 outgoing.Optical sheet 650 covers the main areas MS and the subregion SS of light guidance unit 640.

Optical sheet 650 comprises reflector plate 651, diffusion disk 653 and a plurality of brightness enhancement sheet 655.

Reflector plate 651 is on the relative respective surfaces (not shown) of light guidance unit 640 and light exit surface 641, therefore reflect from reflector plate 651 from a part of light that light guidance unit 640 leaks by respective surfaces, turn back to light guidance unit 640, thereby improved the brightness of backlight assembly 600.

Diffusion disk 653 and brightness enhancement sheet 655 are on light exit surface 641.Diffusion disk 653 diffusions are from the light of light guidance unit 640 outgoing, to increase the brightness uniformity of light.In Figure 13, vertically the differing from one another of brightness enhancement sheet 655 is to increase the brightness when the plane is watched.

Reflector plate 651, light guidance unit 640, diffusion disk 653 and brightness enhancement sheet 655 are contained on the base plate 621 of storage container 620 successively.First side 643, second side 645, the 3rd side 647 and the 4th side (not shown) of light guidance unit 640 corresponds respectively to the first, second, third and the 4th sidewall 623,625,627 and 629 of storage container 620.The one LED 611 produces light on first side 643 of light guidance unit 640.The 2nd LED613 with the 3rd side 647 of the corresponding smooth guidance unit 640 of subregion SS on produce light.

Figure 14 shows the decomposition diagram of the demonstration backlight assembly 700 of another example embodiment according to the present invention.Figure 15 is the sectional view that is obtained along line IV-IV ' shown in Figure 14.

Refer to figs. 14 and 15, backlight assembly 700 comprises first light source, secondary light source, power supply printed circuit film 715, power supply unit 717, storage container 720, light guidance unit 740 and optical sheet 750.

In Figure 14 and 15, first and second light sources comprise a LED 711 and the 2nd LED713.Except driving method, Figure 14 and 15 first and second light sources are identical with Figure 12's.Therefore, omission is about the further explanation of first and second light sources.

The one LED 711 produces light in the selection mode drive pattern, and does not produce light in the steady state drive pattern.The 2nd LED 713 does not produce light in the selection mode drive pattern, and produces light in the steady state drive pattern.Power supply unit 717 provides electric current to a LED 711 in the selection mode drive pattern, provide electric current to the 2nd LED 713 in the steady state drive pattern.

For example, power supply printed circuit film 715 can have landing tee in fact and puts.For example, the first of power supply printed circuit film 715 can extend along first direction, and hold a LED 711 thereon, and the second portion of power supply printed circuit film 715 can extend along vertical with first direction in fact second direction, from the central area of first, and can hold the 2nd LED 713 thereon.Power supply printed circuit film 715 comprises respectively first and second leads that link to each other with 713 with first and second LED 711.For example, three the one LED 711 are installed in the first of T shape power supply printed circuit film 715.In addition, the 2nd LED 713 is installed on the second portion of T shape power supply printed circuit film 715.

Except second recess 726, Figure 14 and 15 storage container 720 be identical with Figure 12 in fact.Therefore, omission is about the further explanation of the same unit of storage container 720.On the inside surface of second sidewall 725, form second recess 726, to hold the 2nd LED 713.Second sidewall 725 is relative with the first side wall 723, and third and fourth sidewall 727,729 toward each other and the first side wall 723 is linked to each other with second sidewall 725.

Light guidance unit 740 comprises key light guided plate 741 and the sub-light guide plate 745 that separates with key light guided plate 741.

Figure 14 and 15 light guidance unit 740 be identical with Figure 12 in fact, except light guidance unit 740 is divided into advocate peace sub-light guide plate 741 and 745.Therefore, omission is about the further explanation of the same characteristic features of light guidance unit 740.The light exit surface of key light guided plate 741 has first area, and the light exit surface of sub-light guide plate 745 has the second area less than first area.

In the selection mode drive pattern, the light that key light guided plate 741 produces from a LED 711 to the guiding of the front of backlight assembly 700.In the steady state drive pattern, the light that sub-light guide plate 745 produces from the 2nd LED 713 to the guiding of the front of backlight assembly 700.

Light guidance unit 740 can also comprise reflection layer 747.Reflection layer 747 places between key light guided plate 741 and the sub-light guide plate 745, to separate key light guided plate 741 and sub-light guide plate 745 optically.It is the plate-like form that non-zero angle (for example vertical in fact) is extended that reflection horizon 747 can have with the light exit surface with respect to light guidance unit 740 in fact.Reflection horizon 747 comprises high reflecting material.Can comprise aluminium, aluminum-neodymium alloys, silver etc. as the high reflecting material example in reflection horizon 747.

Identical with shown in Figure 11 to 13 of Figure 14 and the optical sheet 750 shown in 15.Therefore, omission is about the further explanation of optical sheet.

Reflector plate 751, light guidance unit 740, diffusion disk 753 and brightness enhancement sheet 755 are contained on the base plate 721 of storage container 720 successively.Key light guided plate 741 is parallel with sub-light guide plate 745 in fact.Reflection horizon 747 places advocates peace between

sub-light guide plate

741 and 745.

Figure 16 shows the sectional view of the demonstration display device 800 of another example embodiment according to the present invention.

With reference to Figure 16, display device 800 comprises light source, light guidance unit 830 and display panel 890.In Figure 16, light source can comprise LED 810, although other light source is also in the scope of these embodiment.

LED 810 shown in Figure 16 is identical with light guidance unit 139 with light source 131 shown in Figure 2 with light guidance unit 830.Therefore, omission is about the further explanation of above element.

The refractive index of light guidance unit 830 and air is respectively 1.49 and 1.0.Light from LED 810 enters light guidance unit 830 by light incident surface 831.From the emergence angle of the light of the main areas MS outgoing of the light exit surface 833 of light guidance unit 830 with respect to vertical with the light exit surface 833 of light guidance unit 830 in fact normal direction form about 75 ° to about 83 ° angle.The optical pattern 834 that forms in the subregion SS of the light exit surface 833 of light guidance unit 830 is to the light of display device 800 guiding from the subregion SS outgoing of the light exit surface 833 of light guidance unit 830.

On the respective surfaces 835 of light guidance unit 830, form light scattering pattern 838.Light scattering pattern 838 is a plurality of somes shapes.The light scattering pattern 838a of main areas MS has the low density of light scattering pattern 838b than subregion SS.Therefore, by the optical loss among the light scattering pattern 838 compensation subregion SS, to increase the brightness uniformity of display device 800.

Display device 800 can also comprise optical sheet 840.Optical sheet 840 can with identical or its variant of optical sheet at preceding embodiment.Optical sheet 840 improves from the optical characteristics of the light of light exit surface 833 outgoing of light guidance unit 830, for example brightness uniformity, the brightness when the plane is watched etc.For example, the light from light exit surface 833 outgoing can be even light.

Display panel 890 uses from the even light of light guidance unit 830 outgoing and comes display image.Display panel 890 comprises main display part MDP and sub-display part SDP.In the selection mode drive pattern, display image on advocate peace sub-display part MDP and SDP.In the steady state drive pattern, display image on sub-display part SDP only, and on main display part MDP display image not.

Main display part MDP basis optionally shows master image from the light of the main areas MS outgoing of light guidance unit 830.Sub-display part SDP shows subimage consistently according to the light from the subregion SS outgoing that wherein formed optical pattern 834.

Display panel 890 comprises first substrate 891, second substrate 895 and is clipped in liquid crystal layer (not shown) between first and second substrates 891,895.

First substrate 891 comprises main pixel parts and subpixel part.In the selection mode drive pattern, the pixel capacitors on main pixel parts applies first drive signal, to show master image.In selection mode drive pattern and steady state drive pattern, the pixel capacitors on the subpixel part applies second drive signal, to show subimage.

Second substrate 895 is corresponding with first substrate 891.Second substrate 895 comprises main colour filter part and sub-colour filter part.The main colour filter part of second substrate 895 corresponding to the main pixel parts of first substrate 891.Main colour filter part and main pixel parts form main display part MDP.The sub-colour filter part of second substrate 895 is corresponding to the subpixel part of first substrate 891.Sub-colour filter part and subpixel partly form sub-display part SDP.Second substrate 895 can also comprise and the corresponding public electrode of the pixel capacitors of first substrate 891.

The liquid crystal layer (not shown) places between first and

second substrates

891 and 895.

Display panel 890 can also comprise panel printed circuit film 897.Panel printed circuit film 897 is electrically connected with the end of first substrate 891, so that the panel driving signal is sent to display panel 890.

According to the panel driving signal, between the public electrode on each pixel capacitors on first substrate 891 and second substrate 895, form electric field.The liquid crystal response of liquid crystal layer (not shown) changes arrangement in the electric field that applies to it, therefore changes the transmissivity of liquid crystal layer (not shown), thereby shows master image or subimage.

In the selection mode drive pattern, apply first electric current to LED 810, on the main display part MDP of display panel 890 and sub-display part SDP, to show master image and subimage respectively.

In the steady state drive pattern, apply second electric current to LED 810 less than first electric current, therefore the optical pattern 834 of light guidance unit 830 and light scattering pattern 838 are to the subregion SS of light guidance unit 830 direct light, so that show subimage on the sub-display part SDP of display panel 890.Therefore, the brightness of subimage increases, although second electric current is less than first electric current.

Figure 17 shows the decomposition diagram of the demonstration display device 900 of another example embodiment according to the present invention.Figure 18 is the sectional view that is obtained along line V-V ' shown in Figure 17.

With reference to Figure 17 and 18, display device 900 comprises light source, light guidance unit 930, first optical sheet 960, second optical sheet 970 and display panel 990.In Figure 17 and 18, light source can comprise LED 920, although other light source also is in the scope of these embodiment.Light from LED 920 incides on the light incident surface 931 of light guidance unit 930, and light or from light exit surface 933 outgoing, or in reflection between light exit surface 933 and respective surfaces 935 before light exit surface 933 outgoing.

Included LED 920, light guidance unit 930 and first and second optical sheets 960 of Figure 17 and the backlight assembly 905 shown in 18 are identical with light source 310, light guidance unit 330 and first and second optical sheets 360 and 370 among Fig. 5 with 970.Therefore, omission is about the further explanation of above element.

As Figure 17 and the display panel 990 of panel printed circuit film 997 that has first and second substrates 991,995 and be attached to first substrate 991 shown in 18 with shown in Figure 16 identical.Therefore, omission is about the further explanation of above element.

Display panel 990 comprises main display part MDP and sub-display part SDP.Main display part MDP is corresponding to the main areas MS of light guidance unit 930, and sub-display part SDP is corresponding to the subregion SS of light guidance unit 930.Display panel 990 is according to the light from first and second

optical sheets

960 and 970 outgoing, display image.First optical sheet 960 comprises diffusion disk 961, brightness enhancement sheet 963 and the screening glass 965 that is positioned on the light guidance unit 930.Can also on the respective surfaces 935 of light guidance unit 930, reflector plate 967 be set.Second optical sheet 970 is between the brightness enhancement sheet 963 and screening glass 965 of first optical sheet 960.

Main display part MDP is according to the light from 960 outgoing of first optical sheet, display image.For example, master image comprises image, character etc.

In selection mode drive pattern and steady state drive pattern, sub-display part SDP shows subimage according to the light from first and second

optical sheets

960 and 970 outgoing.For example, subimage comprises time, date, battery status etc.

The LED 920 of steady state drive pattern receives the electric current littler than the LED920 of selection mode drive pattern, so the brightness of the LED 920 of steady state drive pattern is less than the brightness of the LED 920 of selection mode drive pattern.Yet, the brightness of the light among the subregion SS of second optical sheet, 970 increase light guidance units 930.That is, increased in the steady state drive pattern, although the LED of steady state drive pattern 920 receives the electric current littler than the LED 920 of selection mode drive pattern from the brightness of the light of subregion SS outgoing.

Figure 19 shows the skeleton view of the demonstration display device 1100 of another example embodiment according to the present invention.Figure 20 shows the decomposition diagram of the example embodiment of display device shown in Figure 19.Figure 21 is the sectional view that is obtained along line VI-VI ' shown in Figure 20.

Referring to figures 19 through 21, display device 1100 comprises backlight assembly 1105, driving circuit section 1117 and display panel 1190.

Backlight assembly 1105 comprises first light source, secondary light source, power supply printed circuit film 1115, storage container 1120, light guidance unit 1140 and optical sheet 1150.First and second photo-emission sources can comprise a LED 1111 and the 2nd LED 1113 respectively.Storage container 1120 comprises base plate 1121, the first side wall 1123, second sidewall 1125, the 3rd sidewall 1127 and the 4th sidewall 1129.Reflector plate 1151 as the part of optical sheet 1150 is positioned on the base plate 1121.Light guidance unit 1140 comprises respectively first surface 1143, relative second surface 1145, three surface 1147 and four surface adjacent with the 4th sidewall 1129 with the first side wall 1123, second sidewall 1125, the 3rd sidewall 1127.Optical sheet 1150 also comprises diffusion disk 1153 and brightness enhancement sheet 1155.By light incide display panel 1190 before process diffusion disk 1153 and the brightness enhancement sheet 1155 of light exit surface 1141 from 1140 outgoing of light guidance unit.Except the power supply unit 617 of backlight assembly 600, the backlight assembly 1105 shown in Figure 19 to 21 is identical with shown in Figure 11 to 13 in fact.Therefore, omission is about the further explanation of above element.

Driving circuit section 1117 provides electric current in the selection mode drive pattern first and second LED1111 and 1113, and electric current is provided in the steady state drive pattern the 2nd LED 1113.Driving circuit section 1117 is electrically connected with power supply printed circuit film 1115 by panel printed circuit film 1197.

Except power supply unit, shown in Figure 19 to 21 have first and second substrates 1191 and 1195 and between the display panel 1190 of liquid crystal layer 1196 with shown in Figure 17 identical.Therefore, omission is about the further explanation of above element.Driving circuit section 1117 is installed on the panel printed circuit film 1197, in order to drive display device.The electric current that driving circuit 1117 outputs are used to drive the drive signal of display panel 1190 and are used to drive first and second LED1111 and 1113.Drive signal comprises data-signal, control signal etc.

The first side wall 1123 of storage container 1120 has first guide recess and second guide recess.Panel printed circuit film 1197 is accommodated in first and second guide recess.In second guide recess of the first side wall 1123, panel printed circuit film 1197 is electrically connected with power supply printed circuit film 1115.1197 bendings of panel printed circuit film, and be accommodated in first guide recess, as shown in figure 21 along the first side wall 1123.

Display panel 1190 comes display image according to the light that produces from backlight assembly 1105.

In the selection mode drive pattern, first and second LED 1111 of backlight assembly 1105 and 1113 control signals according to driving circuit section 1117 produce light, provide light to give main display part MDP and sub-display part SDP.Display panel 1190 shows master image according to the control signal of driving circuit section 1117 on main display part MDP.Master image comprises image, character etc.Display panel 1190 shows subimage according to the control signal of driving circuit section 1117 on sub-display part SDP.Subimage comprises time, date, battery status etc.Alternatively, the 2nd LED 1113 does not produce light in the selection mode drive pattern.

In the steady state drive pattern, the 2nd LED 1113 produces light according to the control signal of driving circuit section 1117, provides the light that produces from the 2nd LED 1113 to give sub-display part SDP.Display panel 1190 shows subimage according to the control signal of driving circuit section 1117 on sub-display part SDP.Subimage comprises time, date, battery status etc.In the steady state drive pattern, a LED 1111 can not produce light.

Figure 22 shows the decomposition diagram of the demonstration display device 1300 of another example embodiment according to the present invention.Figure 23 is the sectional view that is obtained along line VII-VII ' shown in Figure 22.

With reference to Figure 22 and 23, display device 1300 comprises backlight assembly 1305, driving circuit section 1317 and display panel 1390.

Backlight assembly 1305 comprises first light source, secondary light source, power supply printed circuit film 1315, storage container 1320, light guidance unit 1330 and optical sheet 1360.First and second photo-emission sources comprise a LED 1311 and the 2nd LED 1313 respectively.Storage container 1320 comprises base plate 1321, the first side wall 1323, second sidewall 1325, the 3rd sidewall 1327 and the 4th sidewall 1329.The reflector plate 1361 of optical sheet 1360 is accommodated on the base plate 1321.Comprise key light guided plate 1340, sub-light guide plate 1350 and place between the light guidance unit 1330 in reflection horizon 1355 be set on the reflector plate 1361.Optical sheet 1360 also comprises diffusion disk 1363 and brightness enhancement sheet 1365.Except power supply unit, first and second light sources, power supply printed circuit film and storage container, the backlight assembly 700 with shown in Figure 14 is identical in fact with the backlight assembly 1305 shown in 23 for Figure 22.Figure 22 and first and second light sources shown in 23, power supply printed circuit film 1315 and storage container 1320 are with shown in Figure 12 identical.Therefore, omission is about the further explanation of above element.

Display panel 1390 comprise first substrate 1391, second substrate 1395 and place between liquid crystal layer 1396.Driving circuit section 1317 is connected to the panel printed circuit film 1397 that links to each other with first substrate 1391.Figure 22 and the driving circuit section 1317 shown in 23 and display panel 1390 are identical with Figure 20's.Therefore, omission is about the further explanation of above element.

Figure 24 shows the decomposition diagram of the demonstration display device 1500 of another example embodiment according to the present invention.Figure 25 is the sectional view that is obtained along line VIII-VIII ' shown in Figure 24.

With reference to Figure 24 and 25, display device 1500 comprises backlight assembly 1505, driving circuit section 1517 and display panel 1590.

Backlight assembly 1505 comprises pointolite, power supply printed circuit film 1515, storage container 1520, light guidance unit 1540 and optical sheet 1550.Storage container 1520 comprises base plate 1521, the first side wall 1523, second sidewall 1525, the 3rd sidewall 1527 and the 4th sidewall 1529.The reflector plate 1551 of optical sheet 1550 is set on the base plate 1521 of storage container 1520.Optical sheet 1550 also comprises diffusion disk 1553 and the brightness enhancement sheet 1555 between light guidance unit 1540 and display panel 1590.Except pointolite, power supply printed circuit film, storage container and power supply unit, Figure 24 and the backlight assembly 1505 shown in 25 be identical with shown in Figure 11 to 13 in fact.Therefore, omission is about the further explanation of above element.

In Figure 24 and 25, the pointolite of backlight assembly 1505 comprises LED 1511.For example, the number of LED 1511 is one, to reduce power consumption and manufacturing cost.

Light guidance unit 1540 comprises light exit surface 1541, first side 1543, second side 1545, the 3rd side 1547 and the 4th side 1549.Light exit surface 1541 comprises main areas MS and subregion SS.Main areas MS and subregion SS are connected with each other along first direction (S-M direction).First side 1543 links to each other along first direction with main areas MS.Second side 1545 is corresponding to first side 1543, and links to each other with subregion SS.The 3rd surface 1547 is along linking to each other with subregion SS with main areas MS with the vertical direction of first direction in fact.The 4th side 1549 is corresponding to the 3rd side 1547, and links to each other with SS with the subregion MS that advocates peace.First to fourth side 1543,1545,1547,1549 of light guidance unit 1540 is corresponding to first to fourth sidewall 1523,1525,1527,1529 of storage container 1520.Light guidance unit 1540 can also comprise corresponding with light exit surface 1541 and adjacent with reflector plate 1551 respective surfaces.LED 1511 and can be arranged in the recess 1526 of second sidewall 1525 of storage container 1520 on second side 1545 of light guidance unit 1540.

Display panel 1590 comprises first substrate 1591, second substrate 1595 and places liquid crystal layer 1596 between first and second substrates 1591,1595.Panel printed circuit film 1597 links to each other with first substrate 1591, and driving circuit section 1517 links to each other with panel printed circuit film 1597.Identical with shown in Figure 19 to 21 of Figure 24 and the driving circuit section 1517 shown in 25 and display panel 1590.Therefore, omission is about the further explanation of above element.

Figure 26 A and 26B show the drive signal that applies to LED and the figure of the relation between the power consumption.Figure 26 A shows the figure of first current signal of the selection mode drive pattern that applies to the LED 1511 shown in Figure 24 and 25.Figure 26 B shows the figure of second current signal of the steady state drive pattern that applies to the LED 1511 shown in Figure 24 and 25.

With reference to Figure 24 to 26B, driving circuit section 1517 applies first electric current to LED 1511 in the selection mode drive pattern, and applies second electric current less than first electric current to LED 1511 in the steady state drive pattern.In the steady state drive pattern, main display part MDP does not show any image.

In Figure 26 A, the height Pm of first electric current is corresponding to the level of first electric current that applies to LED 1511 in the selection mode drive pattern.In Figure 26 B, the height Ps of second electric current is corresponding to the level of second electric current that applies to LED 1511 in the steady state drive pattern.That is, the steady state drive pattern be used for showing subimage on sub-display part SDP will be applied to LED 1511 less than second electric current of first electric current, thereby reduce the power consumption of backlight assembly 1505.

Sub-display part SDP shows subimage consistently.In addition, when improving the image displaying quality of sub-display part SDP, also improved the image displaying quality of display device 1500.For example, LED 1511 can with second side 1545 that the subregion SS of light-emitting area 1541 links to each other on, in order to increase the brightness of sub-display part SDP.

Figure 27 A shows main areas when demonstration LED and the demonstration light guidance unit image from the brightness of the light of light guidance unit outgoing when adjacent.Figure 27 B shows subregion when demonstration LED and the demonstration light guidance unit image from the brightness of the light of light guidance unit outgoing when adjacent.In Figure 27 A and 27B,, produce the brightness of the light of process light guidance unit 1540 from LED 1511 according to second electric current in the steady state drive pattern.

With reference to figure 27A, when LED 1511 was adjacent with main areas MS, therefore the brightness of main areas MS damaged the image displaying quality of subregion SS greater than the brightness of subregion SS.

Yet, in Figure 27 B, when LED 1511 is adjacent with subregion SS, has increased the brightness of subregion SS, thereby improved the image displaying quality of subregion SS.For example, the brightness of the subregion shown in the brightness ratio Figure 27 A of the subregion SS shown in Figure 27 B is big about 30%.

Consider the example embodiment of above-mentioned backlight assembly and display device, a kind of method that example embodiment is controlled the brightness in the display panel with sub-display part and main display part according to the present invention comprises: the subregion with respect to the light guidance unit in the backlight assembly is provided with brightness enhancement elements; And the power consumption of backlight assembly first level during the selection mode drive pattern is reduced to second level during the steady state drive pattern, wherein, during the steady state drive pattern, do not reduce the brightness of sub-display part in fact.

For example, setting brightness enhancement elements can comprise: on the subregion of light guidance unit and do not form optical pattern on main areas; With the corresponding zone of the subregion of light guidance unit not with the corresponding zone of the main areas of light guidance unit in place second optical sheet; Perhaps light source is set at subregion adjacent with the light guidance unit.Be provided with under the situation of light source, this method can also comprise: provide first electric power to light source in the selection mode drive pattern, and provide the second lower electric power to light source in the steady state drive pattern.Can also light source be set at main areas adjacent with the light guidance unit, and this method can also comprise: first electric power is provided for during the selection mode drive pattern the adjacent light source of main areas, and second electric power is provided for during the steady state drive pattern light source adjacent with subregion.

According to example embodiment of the present invention, on the subregion of the light exit surface of light guidance unit, form optical pattern, in order to increase the brightness of subregion.In addition, can on the respective surfaces of light guidance unit, form light scattering pattern or brightness and strengthen pattern.

Alternatively, backlight assembly can comprise the optical sheet that has respectively with the corresponding various structures of subregion of advocating peace.In addition, backlight assembly can comprise with the corresponding light source of main areas and with the corresponding light source of subregion.In other optional embodiment, light source can be only on subregion, to reduce the power consumption of backlight assembly.

Therefore, increase the brightness of subregion in the steady state drive pattern, and reduced the power consumption of backlight assembly.

In addition, the example embodiment of display device comprises the various example embodiment of backlight assembly, has therefore increased the brightness of the subimage that shows on the sub display part of display device.Improved and be presented at the image displaying quality of the subdata on the sub-viewing area consistently, and reduced the power consumption of display device.

The present invention has been described with reference to example embodiment.Yet, it is evident that according to the above description, the plurality of optional modifications and variations are conspicuous for those skilled in the art.Therefore, all these the optional modifications and variations in the spirit and scope that drop on claims are contained in the present invention.

Claims

1. a backlight assembly provides direct light to display panel, and wherein display panel has main display part that optionally shows master image and the sub-display part that shows subimage consistently, and described backlight assembly comprises:

Light source produces light; And

The light guidance unit comprises:

Light incident surface incides light incident surface from the light of light source;

Light exit surface has main areas and subregion, and subregion has the optical pattern of increase from the brightness of the light of light source, and direct light is from the light exit surface outgoing; And

Respective surfaces is corresponding to light exit surface.

2. backlight assembly according to claim 1, wherein, optical pattern comprises a plurality of first prisms.

3. backlight assembly according to claim 2, wherein, a plurality of first prisms are essentially triangle.

4. backlight assembly according to claim 2 wherein, forms a plurality of second prisms on respective surfaces.

5. backlight assembly according to claim 1, wherein, main areas has smooth in fact surface.

6. backlight assembly according to claim 1, wherein, main areas and light incident surface are adjacent, and subregion and light incident surface away from.

7. backlight assembly according to claim 1, wherein, respective surfaces is a light reflective surface.

8. backlight assembly according to claim 1, wherein, optical pattern comprises a plurality of protruding patterns.

9. backlight assembly according to claim 1 wherein, forms the light scattering pattern on respective surfaces, and with the corresponding light scattering pattern of main areas have than with the low density of the corresponding light scattering pattern of subregion.

10. a backlight assembly provides direct light to display panel, and wherein display panel has main display part that optionally shows master image and the sub-display part that shows subimage consistently, and described backlight assembly comprises:

Light source produces light;

The light guidance unit comprises that the light from light source incides light incident surface wherein and has main areas and the light exit surface of subregion, and direct light is from the light exit surface outgoing;

First optical sheet on main areas by the first brightness increment rate, makes from the brightness increase of the direct light of main areas outgoing; And

Second optical sheet on subregion by the second brightness increment rate greater than the first brightness increment rate, makes from the brightness increase of the direct light of subregion outgoing.

11. backlight assembly according to claim 10, wherein, first optical sheet also covers subregion, and second optical sheet and first optical sheet are overlapping.

12. backlight assembly according to claim 11, wherein, second optical sheet comprises double brightness enhancement film.

13. backlight assembly according to claim 11, wherein, first optical sheet comprises:

Diffusion disk, the diffusion direct light is to increase brightness uniformity; And

First brightness enhancement sheet increases when the plane is watched the brightness from the diffused light of diffusion disk.

14. backlight assembly according to claim 13, wherein, second optical sheet comprises having second brightness enhancement sheet that vertically is different from first brightness enhancement sheet.

15. a backlight assembly provides direct light to display panel, wherein display panel has main display part that optionally shows master image and the sub-display part that shows subimage consistently, and described backlight assembly comprises:

First light source produces first light in the selection mode drive pattern, described first light source is adjacent with main display part;

Secondary light source produces second light in the steady state drive pattern, described secondary light source is adjacent with sub-display part; And

The light guidance unit guides first and second light, and provides direct light to display panel.

16. backlight assembly according to claim 15, wherein, the light guidance unit comprises:

Light exit surface, comprise with the corresponding main areas in main display part and with the corresponding subregion in sub-display part;

First side links to each other with main areas, and adjacent with first light source; And

Second side links to each other with subregion, and adjacent with secondary light source.

17. backlight assembly according to claim 15, wherein, the light guidance unit comprises:

The key light guided plate, corresponding with main display part, and adjacent with first light source; And

Sub-light guide plate, corresponding with sub-display part, and adjacent with secondary light source.

18. backlight assembly according to claim 17, wherein, the light guidance unit also comprises and places the reflection horizon of advocating peace between the sub-light guide plate, makes key light guided plate and sub-light guide plate isolation.

19. backlight assembly according to claim 15 also comprises optical sheet, is positioned on the light guidance unit, in order to increase brightness uniformity and the brightness when the plane is watched.

20. backlight assembly according to claim 15, wherein, each comprises light emitting diode first and second light sources.

21. a display device comprises:

Light source produces light; And

The light guidance unit comprises:

Light incident surface, light incides light incident surface; And

Light exit surface has main areas and subregion, and subregion has the optical pattern of the brightness that increases light, and direct light is from the light exit surface outgoing; And

Display panel has according to the direct light from the main areas outgoing of light exit surface and shows the main display part of master image and the sub-display part that shows subimage according to the direct light from the subregion outgoing of light exit surface.

22. display device according to claim 21, wherein, with the corresponding respective surfaces of light exit surface on form the light scattering pattern, and with the corresponding light scattering pattern of main areas have than with the low density of the corresponding light scattering pattern of subregion.

23. a display device comprises:

Light source produces light;

The light guidance unit comprises that light incides light incident surface wherein and has main areas and the light exit surface of subregion, and direct light is from the light exit surface outgoing;

First optical sheet on the subregion of advocating peace by the first brightness increment rate, makes from the brightness increase of the direct light of the subregion outgoing of advocating peace; And

Second optical sheet on subregion by the second brightness increment rate greater than the first brightness increment rate, makes from the brightness increase of the direct light of subregion outgoing; And

24. display device according to claim 23, wherein, first optical sheet comprises:

Diffusion disk, diffusion are from the direct light of light exit surface outgoing, to increase brightness uniformity; And

25. display device according to claim 24, wherein, second optical sheet comprises in the double brightness enhancement film and second brightness enhancement sheet at least one.

26. a display device comprises:

Display panel comprises main display part that optionally shows master image and the sub-display part that shows subimage consistently;

Backlight assembly comprises:

First light source, adjacent with main display part, and produce first light;

Secondary light source, adjacent with sub-display part, and produce second light; And

The light guidance unit guides first and second light to display panel; And

Driving circuit section is provided electric power in the selection mode drive pattern first light source, and provide electric power to secondary light source in the steady state drive pattern.

27. display device according to claim 26, wherein, driving circuit section is electrically connected with display panel, and driving circuit section provides first drive signal with the demonstration master image to display panel in the selection mode drive pattern, and provides second drive signal to show subimage to display panel in the steady state drive pattern.

28. display device according to claim 26, wherein, the light guidance unit comprises:

First side, adjacent with first light source;

Second side, adjacent with secondary light source; And

Light exit surface is connected between first and second sides, and first and second light that are directed are from the light exit surface outgoing.

29. display device according to claim 26, wherein, the light guidance unit comprises:

The key light guided plate, corresponding with main display part, adjacent with first light source;

Sub-light guide plate, corresponding with sub-display part, adjacent with secondary light source.

30. a display device comprises:

Backlight assembly comprises:

Pointolite, adjacent with sub-display part, and produce light; And

The light guidance unit is to the display panel direct light; And

Driving circuit section provides first electric power to pointolite in the selection mode drive pattern, provide second electric power to pointolite in the steady state drive pattern.

31. display device according to claim 30, wherein, main display part shows master image in the selection mode drive pattern, and sub-display part shows subimage in the steady state drive pattern.

32. display device according to claim 30, wherein, the light guidance unit comprises:

Light exit surface, have with the corresponding main areas in main display part and with the corresponding subregion in sub-display part; And

The side links to each other with the subregion of light exit surface, and is adjacent with pointolite.

33. a control has the method for the brightness in the display panel of sub-display part and main display part, described method comprises:

Subregion with respect to the light guidance unit in the backlight assembly is provided with brightness enhancement elements; And

The power consumption of backlight assembly first level during the selection mode drive pattern is reduced to second level during the steady state drive pattern;

Wherein, during the steady state drive pattern, do not reduce the brightness of sub-display part in fact.

34. method according to claim 33, wherein, the step that brightness enhancement elements is set comprises: on the subregion of light guidance unit and do not form optical pattern on main areas.

35. method according to claim 33, also comprise: first optical sheet is set between light guidance unit and display panel, wherein, the step that brightness enhancement elements is set comprises: with the corresponding zone of the subregion of light guidance unit in and not with the corresponding zone of the main areas of light guidance unit in place second optical sheet.

36. method according to claim 33, wherein, the step that brightness enhancement elements is set comprises: at the subregion adjacent with the light guidance unit light source is set.

37. method according to claim 36 also comprises: in the selection mode drive pattern, provide first electric power to light source; And in the steady state drive pattern, provide the second lower electric power to light source.

38. method according to claim 36, also comprise: light source is set at main areas adjacent with the light guidance unit, first electric power is provided during the selection mode drive pattern, for the light source adjacent, and second electric power is provided during the steady state drive pattern, for the light source adjacent with subregion with main areas.