CN101315494B - Liquid crystal display device - Google Patents
Liquid crystal display device Download PDFInfo
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- CN101315494B CN101315494B CN2008101098143A CN200810109814A CN101315494B CN 101315494 B CN101315494 B CN 101315494B CN 2008101098143 A CN2008101098143 A CN 2008101098143A CN 200810109814 A CN200810109814 A CN 200810109814A CN 101315494 B CN101315494 B CN 101315494B
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Abstract
A direct type backlight unit used in a liquid crystal display device is provided which can suppress lowering of luminance at an electrode portion of a linear light source. A reflecting plate is formed on a side wall of a box-shaped reflector close to an end of a linear light source. The reflector reflects light beams from the linear light source to be guided toward a liquid crystal panel. The reflecting plate on the side wall has at least two inclined surfaces. The inclined surfaces may have a stepped shape or a convex ridge shape. According to this arrangement, it is possible to reduce or eliminate decrease of the luminance level at ends of an effective display area of a liquid crystal panel.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator, particularly relates to directly-below type backlight unit that uses in the liquid crystal indicator and the liquid crystal indicator with this backlight unit.
Background technology
As the liquid crystal panel that uses in the liquid crystal indicator, be well known that and use the capable and TFT (thin film transistor (TFT): etc. active array type Thin Film Transistor) of simple matrix.But such liquid crystal panel owing to be not emissive type, in order to make the image viewing that forms in liquid crystal panel, needs other lighting source.
Therefore, liquid crystal indicator, by around dispose the display panels of drain driver and gate drivers and the backlight unit that display panels is shone (below, backlight unit is called BLU) and constitute.
This BLU exists photometry type BLU and directly-below type BLU.In recent years, become maximization, big picture of liquid crystal indicator drawn, in the liquid crystal indicator of so large-scale, big picture, and the suitable directly-below type BLU that can access high brightness.In addition, adopt the liquid crystal indicator of the BLU of directly-below type, for example in the Jap.P. spy opens 2006-259750 number, Japanese patent laid-open 11-084377 communique, put down in writing.
In the BLU of directly-below type, (for example has one or more linear light source, cold-cathode fluorescence lamp), possess simultaneously and comprise that incident has from the optics of the diffuser plate of the light of linear light source irradiation and has shine the catoptron (reflection part) of the reflecting surface that reflects to the display panels side with the light of display panels opposition side from linear light source.
In recent years, in the liquid crystal indicator of big picture, the requirement of slimming becomes stronger.But,, must make directly-below type BLU slimming in order to make the liquid crystal indicator slimming of big picture.The slimming of directly-below type BLU, that is, when shorten between optics and the catoptron apart from the time, can exist in the uneven problem of display surface Luminance Distribution of display panels.Luminance Distribution inhomogeneous especially very remarkable at the end face of display panels exists in the problem that the brightness of both ends of the surface of the length direction of linear light source reduces.
Above-mentioned Luminance Distribution inhomogeneous especially very remarkable at the end face of display panels exists in linear light source (EEFL (external electrode fluorescent lamp: the problem that the brightness of the both ends of the surface of) length direction such as External ElectrodeFluorescent Lamp) reduces for example.In addition, because the electrode part that is positioned at the two ends of length direction of linear light source or an end is under the situation of the effective range of BLU, electrode is not luminous, so see it being dark portion here, the problem of brightness irregularities takes place.
Summary of the invention
The present invention finishes in view of the above problems.And the invention provides the decay of brightness at the both ends of the length direction that alleviates light source, reduce the inconsistent technology of brightness simultaneously.
The present invention makes the tilting towards the frame outside at least of sidewall of the frame of two end regions that are positioned at linear light source.
Promptly, the present invention, possessing liquid crystal panel and be arranged on the back side of this liquid crystal panel and penetrate in the liquid crystal indicator of backlight unit of illumination light, having at least: from each relative pair of parallel ora terminalis of the bottom of essentially rectangular to the frame of the sidewall that the liquid crystal panel direction erects, linear light source, the light diffusing sheet that between linear light source and liquid crystal panel, inserts along the direction installation parallel with a side of the pair of sidewalls of the inner bottom part of this frame; Has the reflecting surface that the direction opened towards the opposite direction of liquid crystal panel direction from the bottom tilts with the pair of sidewalls of the direction of linear light source quadrature inboard at least.
In addition, preferred feature is, backlight unit in the above-mentioned liquid crystal indicator, with each sidewall of the direction of linear light source quadrature on have two above different inclination angle reflecting surface.
In addition, preferred feature is, backlight unit in the above-mentioned liquid crystal indicator has the reflecting surface of inclination respectively in the both sides of the electrode part of linear light source.
In addition, preferred feature is, backlight unit in the above-mentioned liquid crystal indicator is made of a curved reflecting surface at least with the sidewall of the direction of linear light source quadrature.
In addition, preferred feature is, backlight unit in the above-mentioned liquid crystal indicator is made of a plurality of stair-stepping reflectings surface with the sidewall of the direction of linear light source quadrature.
In addition, preferred feature is, backlight unit in the above-mentioned liquid crystal indicator is made of a plurality of reflectings surface that the bottom from frame begins the pitch angle and increases gradually with the sidewall of the direction of linear light source quadrature.
In addition, preferred feature is, backlight unit in the above-mentioned liquid crystal indicator begins a plurality of reflectings surface that the pitch angle reduces gradually with the sidewall of the direction of linear light source quadrature by the bottom from frame and constitutes.
In addition, of the present invention possess liquid crystal panel, be used for a plurality of linear light sources to the rear side that is configured in above-mentioned liquid crystal panel of above-mentioned liquid crystal panel irradiates light, display device with the frame with bucket shape shape of the rear side that is configured in described linear light source, it is characterized in that, the internal face of above-mentioned frame is provided with and is used to reflect from the light of above-mentioned linear light source and shines the reflecting part of above-mentioned liquid crystal panel, above-mentioned linear light source, horizontal direction with above-mentioned liquid crystal panel is the side that length direction is arranged on above-mentioned frame, around the part that is provided with described linear light source of the reflecting part of the side that is arranged at above-mentioned frame, be provided with recess, by this recess, around the part that is provided with described linear light source, form reflecting part with curved surface.
When the display surface side of above-mentioned liquid crystal panel is seen the side of above-mentioned frame, above-mentioned recess is half-oval shaped.Have only in addition display surface quadrature above-mentioned recess and above-mentioned liquid crystal panel and with the cross section of the horizontal direction parallel of liquid crystal panel be curved surface.In addition, preferably with the display surface quadrature of above-mentioned liquid crystal panel and with the cross section of the horizontal direction parallel of liquid crystal panel in, the tangent line of the curved surface of above-mentioned recess is with different and different according to the position of above-mentioned curved surface with the straight line angulation of the horizontal direction parallel of above-mentioned liquid crystal panel.This angle can become big to above-mentioned liquid crystal panel side gradually from the bottom surface of above-mentioned frame.
In addition, can reflecting element be set in the mode of the electrode part that covers above-mentioned linear light source.This reflecting element is roughly arch with the display surface quadrature of above-mentioned liquid crystal panel and the cross section parallel with the vertical direction of liquid crystal panel.Above the reflecting element of this arch, with the display surface quadrature of above-mentioned liquid crystal panel and with the cross section of the horizontal direction parallel of liquid crystal panel in have curved surface.
In addition, can implement chamfering to the reflecting part of the side of above-mentioned frame and the boundary portion of above-mentioned recess.In addition, above-mentioned recess corresponding to above-mentioned a plurality of linear light sources each and be provided with, the shape of the center side of the above-mentioned frame of the boundary portion of adjacency between above-mentioned a plurality of recesses is seen as linearity or arcuation from the display surface side of above-mentioned liquid crystal panel.
According to aforesaid the present invention, in the liquid crystal indicator of slimming, the minimizing in the brightness of the display panels at the both ends of the length direction of linear light source is tailed off, luminescent quality is improved.And can realize narrow frameization.Can keep the inconsistent of brightness and improve peripheral luminous intensity.
Description of drawings
Fig. 1 is the illustraton of model of configuration example with liquid crystal indicator of directly-below type back-lighting.
Fig. 2 is the figure that is used to illustrate near the Luminance Distribution the end, effective viewing area of catoptron of the present invention.
Fig. 3 is the figure that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 4 is the figure that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 5 is the figure that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 6 is the figure that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 7 is the figure that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 8 is the figure that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 9 is the figure that is used to illustrate an embodiment of catoptron of the present invention.
Figure 10 is the figure that is used to illustrate another embodiment of catoptron of the present invention.
Figure 11 is the figure that is used to illustrate another embodiment of catoptron of the present invention.
Figure 12 is the figure that is used to illustrate another embodiment of catoptron of the present invention.
Figure 13 is the figure that is used to illustrate another embodiment of catoptron of the present invention.
Figure 14 is the figure that is used to illustrate another embodiment of catoptron of the present invention.
Embodiment
Below, use accompanying drawing that embodiments of the present invention are described.Fig. 1 is the illustraton of model that the structure example of the liquid crystal real device that possesses the directly-below type back-lighting is described.Fig. 1 (a) is an open cube display of only representing back-lighting, Fig. 1 (b) is used for explanation and the back-lighting of Fig. 1 (a) is combined in the linear light source of state of liquid crystal panel and the partial cross section figure of right angle orientation, and Fig. 1 (c) is the linear light source of presentation graphs 1 (a) and the partial cross section figure of parallel direction.
Shown in Fig. 1 (a), the back-lighting 1 of directly-below type possesses at least: have from each relative pair of parallel ora terminalis of the base plate 2a of rectangle to the frame 2 of sidewall 2b that the liquid crystal panel direction erects and 2c, along the linear light source 3 of the direction extension installation parallel with the side of the inner bottom part ground pair of sidewalls 2b of the base plate 2a of this frame 2 be inserted in light diffusing sheet 4 between linear light source 3 and the liquid crystal panel.Like this, the frame 2 of present embodiment forms bucket shape shape or box-formed shape.
The state at the back side that this backlight 1 is arranged on liquid crystal panel 5 is shown in Fig. 1 (b), (c).Liquid crystal panel 5 is clamping liquid crystal layer 5e between 2 transparency carrier (glass plate) 5a and 5b, and stacked Polarizer 5c and 5d and constitute on the face of limit thereon.In addition, this liquid crystal panel can be any of simple matrix type or active array type, also can be according to pattern other light compensation film etc. of lamination by any way.In addition, effective viewing area of the liquid crystal panel 5 of the direction indication liquid crystal indicator of arrow A.
Shown in Fig. 1 (b), the linear light source 3 of frame 2 and base plate 2a, and the sidewall 2b parallel with the length direction of linear light source 3, making its inner face at least is reflecting surface, and the light from linear light source 3 is reflected to liquid crystal panel 5 directions, efficiently light is utilized.
On the other hand, shown in Fig. 1 (c), be useful on the electrode 3a that applies voltage at the two ends of linear light source 3, the part of electrode 3a is not luminous.Therefore, can not avoid the brightness of the end of liquid crystal panel to reduce than central portion to a certain extent.But effective viewing area of liquid crystal panel 5 is in the scope of arrow A.That is, till the top of the part of electrode 3, become effective viewing area.If the outside with electrode 3a is configured in effective viewing area can address this problem.But in recent years, except slimming, further, the requirement of narrow frameization also strengthens.If the slimming of PF crystal device and narrow frameization, electrode 3a just has to be configured in the inboard of effective viewing area.
For coated electrode 3a, the inner face at least of the sidewall 2c of the frame 2 at linear light source 3 and right angle, same with Fig. 1 (b), make the surface be reflecting surface, to reflect to the direction of liquid crystal panel 5 from the light of linear light source 3 with the angle that tilts with respect to liquid crystal panel 5, make and effectively utilize the reflection of light mirror.
Fig. 2 is the synoptic diagram of Luminance Distribution of end, effective viewing area that is used for the left side wall 2c of key diagram 1 (c).Fig. 2 (a) is the rough cross-sectional view of expression line source 3 and electrode 3a thereof and the position relative with base plate 2a with left side wall 2c.Fig. 2 (b) is the chart of relation qualitatively that is used for the brightness degree of the liquid crystal panel 5 of explanation on the parallel direction of the line source 3 of Fig. 2 (a).Transverse axis is expression from the end d0 of the effective viewing area position along the parallel direction of line source 3 towards inside, effective viewing area, and the longitudinal axis is the expression brightness degree.In addition, Fig. 2 (c) is for the relation at the electrode 3a of this position of figure table top referential expression and line source 3.And be that expression left side wall 2c and base plate 2a have the skeleton diagram of catoptron that angle is the inclination of θ.Wherein, in the present invention, the sidewall of direction that will be vertical with line source is called catoptron, distinguishes mutually with other reflecting surface.
As can be known, brightness degree P is that inner beginning reduces more the closer to end d0 from effective viewing area in the chart of Fig. 2 (b).That is, begin from the inboard of liquid crystal panel 5 that brightness P does not almost reduce till the electrode 3a, become significantly, become brightness P0 at effective end, viewing area d0 from the minimizing of position d1 (brightness P1) the beginning brightness P of electrode 3a.In addition, if sidewall 2c further reduces at the brightness P0 of effective viewing area end d0 not as the reflection function of catoptron as can be known, almost become zero.
As shown in Figure 2, make sidewall 2c have tiltangle with respect to base plate 2a, and constitute catoptron by making reflecting surface, though be implemented in the minimizing of brightness degree of the effective viewing area that does not have luminous electrode 3a part top of line source 3, also enough not fully.
Next, by Fig. 3, another embodiment of the present invention is described.Fig. 3 is the synoptic diagram that is used to illustrate an embodiment of catoptron of the present invention, and its structure is identical with Fig. 2, possesses the variform sidewall 2c0 with sidewall 2c.
In the embodiments of figure 3, the reflecting surface of sidewall 2c0 is the catoptron that has plural different pitch angle at least, or has the catoptron of plural reflecting surface at least.
That is, shown in Fig. 3 (a) or sidewall 2c0 (c), the catoptron of the embodiment of Fig. 3 has two different pitch angle at least, perhaps has two dip plane at least.In addition, so-called dip plane is two dip plane f1 and the f2 that constitutes by the catoptron of the sidewall 2c0 shown in Fig. 2 (c).For example, the dip plane has three, and wherein, two masks up and down have identical pitch angle, and a middle face is the catoptron of the structure different with upper and lower surfaces.Brightness degree when in addition, the dotted line of Fig. 3 (b) points out once more that the brightness degree represented, solid line are the structures of presentation graphs 3 (a) or Fig. 3 (c) in Fig. 2.According to present embodiment, shown in Fig. 3 (b), effectively the brightness degree of end, viewing area d0 rises to P0 '.
In addition, in the embodiments of figure 3, the axle center 3x of the aspect ratio line source 3 that the angle of inclination of catoptron changes is low.But in addition, axle center 3x high situation than line source 3 is arranged also.And the height with axle center 3x is not a benchmark, can consider the caliber of line source 3 yet, is benchmark with the height of the below of the height of the top of pipe or pipe.In addition, under any situation, border and the electrode 3a of base plate 2a and sidewall 2c0 are in a ratio of the inboard.
Next, by Fig. 4 other embodiment of the present invention is described.Fig. 4 is the synoptic diagram that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 4 and Fig. 2 (c) or Fig. 3 (c) are the synoptic diagram of representing the shape of base plate 2a and catoptron of the present invention from transverse direction simply similarly.One dot-and-dash line is the center 3x of line source 3.
Fig. 4 be the expression catoptron, with the synoptic diagram in the display surface quadrature of liquid crystal panel 5 and the cross section parallel with the horizontal direction (the in other words length direction of light source 3) of liquid crystal panel.The catoptron of Fig. 4 (sidewall) is the embodiment of the number of dip plane for the four sides.In addition, be by the curve of expression not among the figure, the dip plane that the string that connects in for example parabolical constitutes about dip plane h1～h4.Therefore, dip plane h1～h4 ..., hn pitch angle (being dip plane and the straight line angulation parallel) with the display surface of liquid crystal panel 5 in, following relation is arranged.That is:
θ h1＜θ h2＜θ h3＜θ h4＜...＜θ hn ... formula (1)
In addition, if the number of dip plane is unlimited, just become curve.Therefore, in the dip plane that constitutes sidewall of the present invention (catoptron), also comprise curve.In addition, the curve of para-curve etc., opposite up and down, the relation at pitch angle also can be
θ h1＞θ h2＞θ h3＞θ h4＞...＞θ hn ... formula (2)
(with reference to Fig. 5).In this case, the circumscribed string that becomes by the curve of para-curve etc. constitutes.
And curve originally needs not to be 1, also can use the curve of a plurality of same or different forms.
In addition, get the edge of corner part at the junction surface of each dip plane, constitute etc., also can be processed into slick and sly by curve.
Further, also can cut apart curve, form stair-stepping sidewall with the ratio of regulation.In addition, the segmenting structure of dip plane, short transverse, transverse direction about any one, can be impartial, but normally different.For example, can increase the ratio of cutting apart under the little situation in the angle of the tangent line of curve and base plate 2a.
In addition next, by Fig. 5 other embodiment of the present invention is described.Fig. 5 is the synoptic diagram that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 5 and Fig. 2 (c) or Fig. 3 (c) are same, are the synoptic diagram of representing the shape of base plate 2a and catoptron of the present invention from transverse direction simply.One dot-and-dash line is the center 3x of line source 3.Fig. 5 is the embodiment under the situation opposite up and down with the curve of Fig. 4 para-curve etc.That is, the relation at pitch angle is
θ m1＞θ m2＞θ m3＞θ m4＞...＞θ mn ... formula (3)
Next, by Fig. 6 other embodiment of the present invention is described.Fig. 6 is the synoptic diagram that is used to illustrate an embodiment of catoptron of the present invention.
Fig. 6 and Fig. 2 (c) or Fig. 3 (c) are same, are the synoptic diagram of representing the shape of base plate 2a and catoptron of the present invention from transverse direction simply.
As shown in Figure 6, under the situation of catoptron with the dip plane more than 3, the angle that makes the dip plane from following (base plate 2a) side begin in turn for hang plate q0 ..., qk, qk+1, qk+2 ..., (n and k are natural numbers to qn, during 0≤k＜n), following relation are arranged.That is:
θ k＜θ k+1, and, θ k+1＞θ k+2 ... formula (4)
Perhaps
θ k＞θ k+1, and, θ k+1＜θ k+2 ... formula (5)
That is, in the embodiment of Fig. 4 or Fig. 5, the pitch angle of the reflecting surface of each formation catoptron is along with merely increasing or merely reduce to up.
But shown in the embodiment of Fig. 6, the pitch angle that constitutes each reflecting surface of catoptron is not structure of merely successively decreasing or the structure that merely increases progressively, but with the combination of irregular pitch angle.Therefore, catoptron is to have concavo-convex catoptron.
In addition, get the edge of jog of the connecting portion of each reflecting surface, constitute etc., also can be processed into slyness by curve.
Further, describe about other embodiment of the present invention hereinafter.The above embodiments, any one all is the length direction with respect to linear light source, the catoptron that is made of the reflecting surface of a plurality of pitch angle or a plurality of inclinations.But, in other embodiment of the present invention, be the structure that in the shape of the side of linear light source, is provided with inclination.
Fig. 7 is the embodiment about above-mentioned Fig. 4, the synoptic diagram of the mirror portion that expression is seen from the top.In addition, the convenient liquid crystal panel portion that omits in order to explain the situation.And, only represent two linear light sources and left part among the figure.
Fig. 7 is the illustraton of model that expression is seen from the top about the mirror shapes shown in Fig. 4.Dip plane h1～h4 erects from base plate 2a, reaches the liquid crystal panel face.H0 is the part of joining with the frame portion (effectively outside the viewing area) of liquid crystal panel face in addition.
Then, utilize Fig. 8 and Fig. 9 that other embodiment of the present invention is described.Fig. 8 and Fig. 9 are the synoptic diagram that is used to illustrate an embodiment of catoptron of the present invention.
With respect to the foregoing description is that the embodiment of Fig. 8 and Fig. 9 is to have inclination to the direction reflection way vertical with the length direction of linear light source to have the mirror structure of inclination to the length direction reflection way of linear light source.
In Fig. 8, on sidewall 2c, perpendicular between the linear light source 3 of two configurations that are arranged in parallel and be provided with the catoptron of triangle taper.In addition, in Fig. 8, only two linear light sources, base plate 2a and catoptron b1 are represented to midway for convenience.
In addition, the number of the number of linear light source 3 and catoptron b1 can be set arbitrarily.In addition, the length of catoptron b1 can be the length till the other end of not expressing in figure, also can be the length till partwaying.
Fig. 9 is, for example, for the dip plane of the embodiment of Fig. 4, further, also has the structure of the catoptron of inclination on the direction parallel with linear light source 3.
By having such inclination, at the length direction of linear light source, and the light from light source is also reflected effectively on the direction vertical with the length direction of linear light source, so effectively the brightness degree of end, viewing area further promotes.
In addition, in Fig. 9,, only be decorated with single line shape light source, also have three same linear light sources certainly in the left side for the structure that makes catoptron b2 is easy to understand.Similarly, linear light source 3 and base plate 2a also only represent to midway.
In addition, the number of the number of linear light source 3 and catoptron b2 can be provided with arbitrarily.In addition, the length of catoptron b2 can be the length till the other end of not expressing in figure, also can be the length till partwaying.
As mentioned above, according to the embodiment of Fig. 4～Fig. 9 since effectively the brightness degree of the end side of viewing area near inner brightness degree, so can reduce the minimizing of brightness of the end of liquid crystal panel.
That is, in the liquid crystal indicator of slimming, the minimizing in the brightness of the display panels at the both ends of the length direction of linear light source is diminished, can make luminescent quality good.Further can realize narrow frameization.
In the above-described embodiment, make the whole relatively liquid crystal panels of shape of catoptron identical.But,, can be different shapes at the central portion and the both ends of liquid crystal panel with respect to the direction vertical with the direction of principal axis of linear light source.In addition, also can change the shape of catoptron with the order that replaces or stipulate.
And, in the above-described embodiment, the reflecting surface of catoptron, usually in order to improve reflection efficiency, polished or carry out surface treatment and make it have gloss.But, also can for example utilize the equipment of sand-blasting machine etc. to make surface damage, carry out the light diffusion when making the light reflection, the brightness degree of liquid crystal panel is more evenly distributed.In this case, after injured surface, form reflectance coating, also can improve reflectivity.
More than describe the present invention by embodiment, these embodiments only are examples of the present invention, the present invention is not limited only to these embodiments.The present invention is not limited to embodiment, certainly carries out various changes if having common knowledge in the technical field under the present invention in the scope that does not break away from main contents of the present invention.
Next, utilize Figure 10 that other embodiment of the present invention is described.Figure 10 is the synoptic diagram that the shadow surface side (being the display surface side of liquid crystal panel 5) of lighting unit is from behind seen an embodiment of catoptron of the present invention.In this embodiment, reflecting part 2c0 is arranged on the reflecting part of the side 2c of frame 2, is formed with recess 2c1 on this reflecting part 2c0.Around the part of electrode part 3a reflecting part 2c0, linear light source 3 of the side 2c that is arranged at frame 2, form this recess 2c1.In the present embodiment, correspond respectively to a plurality of linear light sources 3 and be provided with recess 2c1 (hereinafter referred to as the recess reflecting part).As can be known from Fig. 10, concavity reflecting part 2c1 regards as from the display surface side of liquid crystal panel 5 and is half-oval shaped.In other words, in the present embodiment, make three-dimensional bending around the allocation position of electrode part 3a reflecting part 2c0, linear light source 3 of the side 2c that is arranged at frame 2.
Concavity reflecting part 2c1 utilizes its curved shape to have roughly spotlight effect at electrode part 3a periphery.The shape of recess 2c1 for example can be ellipse of revolution face, the paraboloid of revolution, drum.In addition, also can be to be similar to a plurality of planes with the shape of their a plurality of combinations or to them.By making the light that penetrates from light source 3 incide concavity reflecting part 2c1 and optically focused, can prevent to descend at electrode part 3a brightness degree at the periphery of electrode part 3a.
Next, utilize Figure 11 that other embodiment of the present invention is described.Figure 11 is the synoptic diagram of an embodiment of expression catoptron of the present invention.Figure 11 a is the synoptic diagram that the shadow surface side (being the display surface side of liquid crystal panel 5) of lighting unit is from behind seen.Figure 11 b is the synoptic diagram that the side of lighting unit is from behind seen, be illustrated on the central shaft of linear light source 3, catoptron, with the display surface quadrature of liquid crystal panel 5 and with the parallel cross section of horizontal direction (length direction of linear light source 3) of liquid crystal panel.This embodiment is, in the embodiment shown in fig. 10, further adds the structure of reflecting element 2c2 of convex of the upper side of the electrode part 3a that is arranged on light source 3.The reflecting element 2c2 of this convex is arranged on position concavity reflecting part 2c1, corresponding with the electrode part 3a top of light source 3, has protruding shape on the direction of liquid crystal panel 5.With the display surface quadrature of liquid crystal panel 5 and the cross section parallel with the left and right directions of liquid crystal panel 5 in, the straight line angulation of the tangent line of the curved surface of recess and the left and right directions that is parallel to liquid crystal panel 5 is different and different according to the position of this curved surface.In addition, this angle becomes big from the bottom surface of frame 2 gradually to liquid crystal panel 5 sides.
The reflecting element 2c2 of convex reflects light to the shadow surface of electrode part 3a periphery, can have the effect of the brightness degree of the periphery that recovers electrode part 3a.The shape of the reflecting element 2c2 of convex for example is made of at least one plane or at least one curved surface.Its shape can be 2 to begin to tilt from the bottom, also can be the curve form with flex point.In addition, the reflecting element 2c2 of convex can have thickness more than the 0.3mm in order to keep intensity.Gap by electrode part 3a and reflector element 2c2 is set to more than the 0.2mm, the conflict of the light source 3 in the time of can preventing the backlight unit vibration and the reflecting element 2c2 of convex.Can prevent the breakage of light source 3, concavity reflecting part 2c1.The reflecting element 2c2 of convex can reflex to the light that penetrates from light source 3 top of electrode part 3a, can prevent to descend at electrode part 3a brightness degree.
Next, utilize Figure 12 that additional embodiments of the present invention is described.Figure 12 is that the side of lighting unit is from behind seen, the synoptic diagram of an embodiment of catoptron of the present invention, be illustrated in the central shaft of linear light source 3, catoptron, with the display surface quadrature of liquid crystal panel 5 and with the parallel cross section of liquid crystal panel horizontal direction (length direction of linear light source 3).And Figure 12 c be expression with the display surface quadrature of liquid crystal panel 5 and with the parallel cross section of liquid crystal panel vertical direction (with the direction of the length direction quadrature of linear light source 3).This embodiment is, structure concavity reflecting part 2c1, that the reflecting element 2cA of arch is set at reflecting part 2c0 in the mode of the electrode part 3a that covers light source 3.From Figure 12 c as can be known, the reflecting element 2cA of this arch forms arch or platform shape with the shape in the display surface quadrature of liquid crystal panel 5 and the cross section parallel with the liquid crystal panel vertical direction.The reflecting element 2cA of platform shape possesses top 2cA1 and side 2cA2 in addition.
The reflecting element 2cA of the arch incident light on the next door of self-electrode portion in the future reflexes to shadow surface, can have the effect of the brightness degree of the periphery that recovers electrode part 3a.The reflecting element 2cA of arch can reflex to the light that penetrates and incide electrode part 3a from light source 3 top of electrode part 3a periphery, can prevent to descend at electrode 3a periphery brightness degree.For the brightness that prevents the both ends of lighting unit rearward reduces, the inclination of reflecting part 2c0 need be set in from roughly 30 spending to 80 degree.But if make sharply, existence can be seen the problem of electrode part 3a.In the prior art, enter in effective viewing area in order to prevent electrode, the countermeasure of having taked to make that light source 3 increases etc., but exist the size of backlight unit to become big problem.According to present embodiment, when the thickness of back-lighting is 10mm when above,, also can keep the homogeneity of brightness even electrode 3a exposes about 3mm from the reflecting element 2cA of arch.
In addition shown in Figure 12 b, the reflecting element 2cA of platform shape with the display surface quadrature of liquid crystal panel 5 and with the cross section of liquid crystal panel horizontal direction parallel in, 2cA1 has curved surface above it.In the present embodiment, 2cA1 is the shape that S was fallen above.Shown in Figure 12 c, the reflecting element 2cA of arch forms arch or platform shape in addition, and side 2cA2 is the structure with respect to the bottom 2a inclination of frame 2.And the shape of the reflecting element 2cA of arch for example is made of at least 1 plane or 1 curved surface at least.
The reflecting element 2cA by making arch and the distance of light source 3 are more than the 0.2mm, light source 3 in the time of can preventing the backlight unit vibration and the conflict of reflector element 2c2 can prevent the reflecting part 2c0 of linear light source 3 and frame side 2c and/or the breakage of concavity reflecting part 2c1.In addition, can prevent the interference that the thermal expansion by reflecting part 2c0 and/or concavity reflecting part 2c1 causes.Further, tilt, can make the light of incident reflex to electrode a top effectively, can prevent to descend at electrode part 3a brightness degree by the reflecting element 2cA that makes arch.
Next, utilize Figure 13 that another embodiment of the present invention is described.Figure 13 is the synoptic diagram that the shadow surface side of lighting unit is from behind seen an embodiment of catoptron of the present invention.As shown in the drawing, in the present embodiment, by to the reflecting part 2c0 of frame side 2c and the border 2cB of concavity reflecting part 2c1, and the boundary portion 2cB between the concavity reflecting part 2c1 of adjacency carries out chamfering and forms R, makes them form the structure of smooth connection.This border for example is that the part of sphere, barrel surface etc. connects glossily, and perhaps the curved surface by other connects.Can be set in about R0.3mm in the scope of about R5mm according to the position.But this does not limit the obtaining value method of R.Under the rough situation of border 2cB between the concavity reflecting part 2c1 of the border 2cB of reflecting part 2c0 and concavity reflecting part 2c1 and adjacency, because distribution of reflected light changes sharp on these borders, so exist in the situation of seeing these borders 2cB on the shadow surface.Here in the present embodiment, connect glossily, can make the variation of the brightness on shadow surface smooth, can suppress the generation of the pattern of brightness disproportionation by making these borders 2cB.Therefore, in the present embodiment, when the image that on the display surface of display panel 5, shows by Visual Confirmation, can improve brightness uniformity.
Next, utilize Figure 14 that another embodiment of the present invention is described.Figure 14 is the synoptic diagram of an embodiment of the catoptron of the present invention seen of the shadow surface side of lighting unit from behind, is the synoptic diagram of shape of representing the catoptron of present embodiment simply.In the above-described embodiment, when the concavity reflecting part 2c1 of adjacency intersects mutually, might produce sharp keen position.When the assembling back-lighting, owing to have the situation of the hand assembling reflecting part 2c0 of personnel selection, if there is sharp keen shape just to have injured danger.In the present embodiment, become the shape of cutting down with the plane, can guarantee operator's security by making sharp keen sharp-pointed position.That is, present embodiment is, shapes boundary portion, frame 2 center side of adjacency between a plurality of concavity reflecting part 2c1 are become, and is seen as rectilinear form 2c4 from the display surface side of liquid crystal panel 5.In the example of Figure 14, make the linearity that is shaped as of this boundary portion, also can form it into the arcuation that protrudes towards the center side of frame 2.And, also can carry out chamfering R is set this boundary portion.
In the above-described embodiment, make the shape of the reflecting element 2cA etc. of concavity reflecting part 2c1, arch be respectively same shape.But,, also can be different shapes at the central portion and the both ends of liquid crystal panel with respect to the direction vertical with the direction of principal axis of light source.In addition, also can change the shape of catoptron with the order that replaces or stipulate.
And in the above-described embodiment, in order to improve the homogeneity of brightness, the reflecting element 2cA of common concavity reflecting part 2c1, arch etc. utilize the coating of scattered reflection sheet or scattered reflection to constitute.But, for example polished or carry out surface treatment and make it have gloss, perhaps, make the reflected light diffusion by the device deface of sand-blasting machine etc., the brightness degree of liquid crystal panel is more evenly distributed.In this case, after deface, form reflectance coating, can improve reflectivity.
Claims (11)
1. liquid crystal indicator is characterized in that:
Possess liquid crystal panel, be used for to a plurality of linear light sources of rear side described liquid crystal panel irradiates light, that be configured in described liquid crystal panel and be configured in the frame with bucket shape shape of the rear side of described linear light source,
The internal face of described frame is provided with and is used to reflect from the light of described linear light source and shines the reflecting part of described liquid crystal panel,
The electrode part at the length direction two ends of described linear light source is arranged on a pair of side of the direction of described frame and length direction quadrature this linear light source, around the part of the electrode part that is provided with described linear light source of the reflecting part of the side that is arranged at described frame, recess is set, by this recess, around the part that is provided with described linear light source, form reflecting part with curved surface.
2. liquid crystal indicator according to claim 1 is characterized in that:
When the display surface side of described liquid crystal panel is seen the side of described frame, described recess is half-oval shaped.
3. liquid crystal indicator according to claim 1 is characterized in that:
Have only display surface quadrature described recess and described liquid crystal panel and with the cross section of the horizontal direction parallel of liquid crystal panel be curved surface.
4. liquid crystal indicator according to claim 3 is characterized in that:
With the display surface quadrature of described liquid crystal panel and with the cross section of the horizontal direction parallel of liquid crystal panel in, the straight line angulation of the tangent line of the curved surface of described recess and the horizontal direction that is parallel to described liquid crystal panel is different and different according to the position of described curved surface.
5. liquid crystal indicator according to claim 4 is characterized in that:
Described angle becomes big from the bottom surface of described frame gradually to described liquid crystal panel side.
6. liquid crystal indicator according to claim 1 is characterized in that:
Mode with the electrode part that covers described linear light source on described recess is provided with reflecting element.
7. liquid crystal indicator according to claim 6 is characterized in that:
Described reflecting element is arch with the display surface quadrature of described liquid crystal panel and the cross section parallel with the vertical direction of liquid crystal panel.
8. liquid crystal indicator according to claim 6 is characterized in that:
Above the reflecting element of described arch, with the display surface quadrature of described liquid crystal panel and with the cross section of the horizontal direction parallel of liquid crystal panel in have curved surface.
9. liquid crystal indicator according to claim 1 is characterized in that:
Implement chamfering at the reflecting part of the side of described frame and the boundary portion of described recess.
10. liquid crystal indicator according to claim 1 is characterized in that:
Described recess corresponding to described a plurality of linear light sources each and be provided with, the shape of the center side of the described frame of the boundary portion of adjacency between described a plurality of recesses is seen as linearity or arcuation from the display surface side of described liquid crystal panel.
11. be used for backlight unit, it is characterized in that to the liquid crystal panel irradiates light:
Possess a plurality of linear light sources that send light; Be configured in the rear side of described a plurality of linear light sources, be provided with and be used to reflect from the light of these a plurality of linear light sources and shine the frame of bucket shape shape of the photo-emission part of described liquid crystal panel,
The electrode part at the length direction two ends of described linear light source is separately positioned on a pair of side of direction of frame and the length direction quadrature this linear light source of described bucket shape shape,
With the display surface quadrature of described liquid crystal panel and the cross section parallel with the length direction of the described linear light source of liquid crystal panel in, the side of the electrode part that described linear light source is set of described frame tilts with respect to the bottom surface of described frame, is arranged on reflecting part the constituting by plural at least plane or plane and curved surface of the side of described frame.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007146610A JP5147297B2 (en) | 2007-06-01 | 2007-06-01 | Liquid crystal display |
| JP2007-146610 | 2007-06-01 | ||
| JP2007146610 | 2007-06-01 | ||
| JP2008022270A JP4961363B2 (en) | 2008-02-01 | 2008-02-01 | Liquid crystal display |
| JP2008-022270 | 2008-02-01 | ||
| JP2008022270 | 2008-02-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101315494A CN101315494A (en) | 2008-12-03 |
| CN101315494B true CN101315494B (en) | 2011-07-27 |
Family
ID=40106548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101098143A Expired - Fee Related CN101315494B (en) | 2007-06-01 | 2008-05-30 | Liquid crystal display device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5147297B2 (en) |
| CN (1) | CN101315494B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5244872B2 (en) * | 2010-08-30 | 2013-07-24 | シャープ株式会社 | Image display device |
| JP6273968B2 (en) * | 2014-03-28 | 2018-02-07 | 船井電機株式会社 | Display device |
| KR102243856B1 (en) * | 2014-04-07 | 2021-04-26 | 삼성디스플레이 주식회사 | Display apparatus |
| US9995962B2 (en) * | 2015-06-12 | 2018-06-12 | Samsung Display Co., Ltd. | Backlight unit and display apparatus including the same |
| JP6187613B2 (en) * | 2016-01-29 | 2017-08-30 | 岩崎電気株式会社 | Surface irradiation device |
| CN109557721B (en) * | 2018-12-21 | 2022-01-07 | 厦门天马微电子有限公司 | Backlight module and display device |
| CN115016175A (en) * | 2022-06-23 | 2022-09-06 | 伟时电子股份有限公司 | Backlight module and display device thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004134281A (en) * | 2002-10-11 | 2004-04-30 | Matsushita Electric Ind Co Ltd | Backlight device and liquid crystal display |
| US20050122444A1 (en) * | 2003-12-05 | 2005-06-09 | Au Optronics Corporation | Reflector of backlight assembly for liquid crystal display device |
| JP2007012569A (en) * | 2005-07-04 | 2007-01-18 | Sony Corp | Backlight device and liquid crystal display device |
-
2007
- 2007-06-01 JP JP2007146610A patent/JP5147297B2/en not_active Expired - Fee Related
-
2008
- 2008-05-30 CN CN2008101098143A patent/CN101315494B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008299167A (en) | 2008-12-11 |
| JP5147297B2 (en) | 2013-02-20 |
| CN101315494A (en) | 2008-12-03 |
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