CN101706081A - Light-focusing module and backlight module - Google Patents
Light-focusing module and backlight module Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 abstract description 33
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- 238000010586 diagram Methods 0.000 description 12
- 238000003306 harvesting Methods 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 8
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Abstract
The invention provides a light-focusing module and a backlight module using the light-focusing module. The light-focusing module comprises a light emitting face and a plurality of light-focusing microstructures; the light emitting face has a geometric center; the light of each light-focusing microstructure has the maximum emitting brightness in certain direction; when the inclined angle between the light emitting direction and the certain direction is a brilliance semi-range angle, the brightness decreases to half the maximum emitting brightness; the light-focusing microstructures change gradually from the geometric center of the light emitting face towards the direction far away from the geometric center, the farer from the geometric center of the light emitting face, the larger the brilliance semi-range angle of the light-focusing microstructures. A liquid crystal display using the light-focusing module and the backlight module seems to have more uniform brightness.
Description
[technical field]
The present invention relates to field of liquid crystal display, relate in particular to a kind of module backlight and concentration module that is used for liquid crystal indicator.
[background technology]
(Liquid Crystal Display LCD) possesses plurality of advantages such as frivolous, energy-conservation, radiationless to liquid crystal indicator, has therefore replaced traditional cathode ray tube (CRT) display gradually.Liquid crystal indicator is widely used in the electronic equipments such as HD digital TV, desktop computer, PDA(Personal Digital Assistant), notebook computer, mobile phone, digital camera at present.
Can find all that with the people who crosses notebook computer or liquid crystal console display there is certain visual angle in display screen, promptly from direction (being normal direction) observation computer or display perpendicular to display plane, brightness (industry claims " briliancy " again) is higher; But, can find that brightness is not very high from the observation of off-normal certain angle.This also conforms with user's instructions for use, uses because notebook computer or liquid crystal console display are normally individual, and this requires the original light that disperses to focus on the certain angle that the center is observed by certain methods, and making in axle center briliancy increases greatly.This effect is because adopted prismatic lens (prism film also claims concentration piece) in the module backlight of liquid crystal indicator, improves optical efficiency and produces.
Prismatic lens, as its name suggests, its surface is a lot of prismatic structure, these prismatic structure normally structure are identical, and very small, to such an extent as to prismatic lens looks like thin film in liquid crystal indicator, be contained in the thickness that can not increase liquid crystal indicator in the liquid crystal indicator, therefore, prismatic lens is also sometimes referred to as prism film, and these small prismatic structure are commonly called micro-structural.
As shown in Figure 1, be the optical effect schematic diagram of prismatic lens micro-structural in the prior art.The exit surface of prismatic lens micro-structural generally includes two crossing inclined-planes, is the inverted v-shaped shape.The light that sends when light source (light source) is injected into prismatic lens through the diffusion of diffusion sheet (diffuser), because the normally transparent optically denser medium of prismatic lens, according to optical laws, total reflection can take place in the light that surpasses certain angle when the exit surface of process micro-structural, repeatedly total reflection takes place and is unattenuated substantially in light in prismatic lens, the light that total reflection takes place is repeated to reflex to diffusion sheet, so the light that light source sends is repeatedly reused between prismatic lens and diffusion sheet, finally to penetrate than convection light and higher utilization rate.According to refraction and total reflection principle, the effect of prismatic lens allows the light that disperses concentrate on bright dipping near the axle center range of 70 degree about normal, is utilized once more and reflect greater than the light that 70 degree penetrate, and can make in axle center brightness increase by 110%.Because light is finally with than the integrated light beam outgoing, so as user during with the direction observation liquid crystal panel of approximate liquid crystal panel normal, the brightness of observed display image is higher; When the user departed from the direction observation liquid crystal panel of liquid crystal panel normal at a certain angle, brightness was lower.
Figure 2 shows that the schematic diagram that concerns of the brightness of prismatic lens in the prior art and viewing angle, it can be used to explain the principle that the brightness of observed display image reduces. as shown in FIG., abscissa is defined as viewing angle, angle between the sight line that is defined as the observer and the normal of display panels. ordinate is defined as the corresponding brightness value of this viewing angle (also can be called brightness value), by the curve shown in Fig. 2 as can be seen, viewing angle is more little, and then its corresponding brightness value is just big more; Viewing angle is big more, then its corresponding brightness value is just more little. usually, half the corresponding viewing angle of brightness value (being briliancy half range value) of maximum brightness value is called " briliancy half range angle ", technical height of explaining the light harvesting effect of prismatic lens with briliancy half range angle. if briliancy half range angle is little, then prismatic lens light harvesting effect is more intense, if briliancy half range angle is big, then prismatic lens light harvesting effect is more weak. and shown in Figure 2 is that a kind of briliancy half range angle is the prismatic lens of about 28 degree, for this prismatic lens, viewing angle is 0 when spending, observed brightness maximum, brightness value the chances are 136 candelas/square metre. if viewing angle surpasses 28 degree, observed brightness will be less than half of high-high brightness, brightness value the chances are 68 candelas/square metre below. from 136 candelas/square metre change to, 68 candelas/square metre, human eye can obviously be felt the reduction of brightness.
In conjunction with reference to figure 3, show the vertical view of liquid crystal indicator among the figure, because the display surface of display panels is generally the rectangle of geometrical length, when the angle of 30 degree from the right side is observed, in fact, to the actual observation angle θ of left area
LGreater than 30 degree, be illustrated as about 45 degree, and the actual observation angle θ in zone, the right
RLess than 30 degree, be illustrated as about 12 degree.According to the schematic diagram that concerns of brightness shown in Figure 2 and viewing angle, the brightness of left area 45 degree viewing angles be about 40 candelas/square metre, the brightness of zone, the right 12 degree viewing angles be about 128 candelas/square metre.The luminance difference in left area and zone, the right is apart from very big like this, and obviously influence is from the observed display image of liquid crystal indicator.And according to TC099, in 2003 standards (a kind of quality authentication standard of formulating by " TCO (the Swedish Confederation of Professional Employees) ") at lcd products for the requirement of the luminous uniformity of deciding (Luminance uniformity-angular dependence) according to the visual angle, when horizontal direction inclination 30 is spent, the minimax brightness ratio (P of zone, the right and left area
R/ P
L) in 1.7, and vertical direction tilts 15 when spending, the minimax brightness ratio of top area and bottom section is in 1.5.According to aforementioned, the brightness ratio (P of zone, the right and left area
R/ P
L) be 128/40=3.20, so adopting briliancy half range shown in Figure 2 angle is that the liquid crystal indicator of the prismatic lenses of about 28 degree can not be by according to TC099, the test that the requirement of 2003 standards is carried out.
In conjunction with reference to viewing angle shown in Figure 4, when when the angles of liquid crystal indicator below 15 degree are observed, in fact to the actual observation angle θ of top area
TGreater than 15 degree, be illustrated as about 45 degree, and to the actual observation angle θ of bottom section
BLess than 15 degree, be illustrated as approximately-6 degree.According to the schematic diagram that concerns of brightness shown in Figure 2 and viewing angle, the brightness of top area 45 degree viewing angles be about 40 candelas/square metre, the brightness of bottom section-6 degree viewing angle be about 132 candelas/square metre.Minimax brightness ratio (the P of top area and bottom section
B/ P
T) be 132/40=3.30, also surpassed TC099, the requirement of 2003 standards 1.5 in.
Therefore be necessary the prismatic lens and the module backlight of prior art are improved.
[summary of the invention]
The technical problem to be solved in the present invention is to provide a kind of concentration module and module backlight that is used for liquid crystal indicator, can guarantee that the center brightness value of liquid crystal indicator is higher.
The technical problem to be solved in the present invention is to provide a kind of concentration module and module backlight that is used for liquid crystal indicator, can guarantee the luminous uniformity of liquid crystal indicator.
The invention provides a kind of concentration module, it comprises exiting surface and a plurality of optically focused micro-structural, this exiting surface has geometric center, the light of each optically focused micro-structural has the maximum brightness of penetrating at certain orientation, brightness was reduced to half of maximum ejaculation brightness when the angle of light ejaculation direction and aforementioned certain orientation was briliancy half range angle, wherein, the optically focused micro-structural from the geometric center of exiting surface to away from the gradual change of geometric center direction, away from the geometric center of exiting surface, the briliancy half range angle of optically focused micro-structural is big more more.Such concentration module is bigger at the optically focused micro-structural briliancy half range angle of the fringe region of exiting surface, the light luminance value is smaller with the amplitude of the variation of angle, so, even the viewing angle in zone, two edges differs bigger, its brightness ratio is not too large, use the liquid crystal indicator of this concentration module to seem that brightness will compare evenly, also easily by according to TCO99, the test that the requirement of 2003 standards is carried out.
Preferably, be distributed with many fins in exiting surface, fin forms the optically focused micro-structural, and every fin includes two and is plane exit plane substantially, and these two exit planes are in certain angle.Concentration module is arranged to many rib structures, two exit planes are in certain angle rather than parallel or coplane setting, can utilize the optical laws of prism total reflection and refraction, making light can compare the concentrated area at exiting surface penetrates, the center brightness value that guarantees liquid crystal indicator is higher, and cost is low.
Preferably, the angle of the exit plane of each optically focused micro-structural is to away from the gradual change of exiting surface geometric center direction, and the closer to the exiting surface geometric center, the angle of the exit plane of optically focused micro-structural is more near 90 degree.According to the optical laws of prism total reflection and refraction, near 90 degree, the briliancy half range angle of optically focused micro-structural is more little more for the angle of the exit plane of optically focused micro-structural, and light is high more in the utilization rate of central area, helps improving brightness value.Otherwise more away from the exiting surface geometric center, the angle of the exit plane of optically focused micro-structural is big or more little more, then the briliancy half range angle of optically focused micro-structural is big more, even viewing angle is bigger, its brightness value reduces not too large, is easy to generate the even brightness observing effect.
Preferably, also include the outgoing cambered surface to the small part fin, two exit planes of the smooth connection of outgoing cambered surface, the outgoing cambered surface with respect to the ratio of the width of exit plane to away from the gradual change of exiting surface geometric center direction, away from the exiting surface geometric center, the outgoing cambered surface width of optically focused micro-structural is big more with respect to the ratio of exit plane width more.According to the law of the total reflection and the refraction of light, the exit plane ratio of optically focused micro-structural is big more, and the effect of prism optically focused is obvious more, and the briliancy half range angle of optically focused micro-structural is more little, and light is high more in the utilization rate of central area, helps improving brightness value.So more away from the exiting surface geometric center, the briliancy half range angle of optically focused micro-structural is big more, even viewing angle is bigger, its brightness value reduces not too large, is easy to generate the even brightness observing effect.
Preferably, each bar fin equidistantly is arranged in parallel.The display unit on plane meets people's observation habit.Each bar fin equidistantly is arranged in parallel, and helps uniform bright dipping, and then obtains good observing effect.
Preferably, every fin is in fact along the straight extension of straight line, and the shape of each bar fin optically focused micro-structural is along the direction gradual change vertical with described straight line.The fin of straight extension is made easily, perpendicular to the gradual change of fin bearing of trend, can obtain well, change the effect at briliancy half range angle, and then upwards helps solving the luminous uniformity technical problem fixed according to the visual angle at the upper and lower of display panels.
Preferably, the optically focused micro-structural of each bar fin fades to the shape of the optically focused micro-structural that is different from this centre to the direction of both ends away from the centre from the centre of this fin.Further change the effect at optically focused micro-structural briliancy half range angle on the fin, and then on the left and right directions of display panels, help solving the luminous uniformity technical problem fixed according to the visual angle.
Preferably, the optically focused micro-structural of each bar fin with respect to the exiting surface geometric center simultaneously to perpendicular to the bearing of trend of fin and to bearing of trend both sides gradual change along fin, further change the effect at optically focused micro-structural briliancy half range angle on the fin, so about the display panels, help solving the luminous uniformity technical problem fixed on the left and right directions according to the visual angle.
The invention provides a kind of module backlight, it comprises fluorescent tube and the described concentration module of aforementioned arbitrary technical scheme, and concentration module is positioned at the fluorescent tube top, is used for the light that the below fluorescent tube sends is focused on top certain angle scope bright dipping.
Use the liquid crystal indicator center brightness value of this module backlight higher, seem that brightness will compare evenly, also easily by according to TCO99, the test that the requirement of 2003 standards is carried out, manufacturing cost is not high simultaneously.
Below by describing the preferred specific embodiment with reference to the accompanying drawings in detail, disclose other aspects and features of the present invention more significantly.But should be known in this accompanying drawing only for task of explanation designs, not as the qualification of scope of the present invention, because the qualification of scope should be with reference to additional claim.Should also be appreciated that unless otherwise indicated, accompanying drawing only tries hard to illustrate conceptually structure described herein and flow process, unnecessary drafting to scale.
[description of drawings]
Fig. 1 is the optical effect schematic diagram of prismatic lens micro-structural in the prior art;
Fig. 2 is the schematic diagram that concerns of the brightness of prismatic lens in the prior art and viewing angle;
Fig. 3 is the vertical view of liquid crystal indicator, wherein shows the situation that 30 degree angles are observed from the right side;
Fig. 4 is the right side view of liquid crystal indicator, wherein shows the situation that 15 degree angles are observed from the bottom side;
Fig. 5 is the decomposition texture schematic diagram of the module backlight of one embodiment of the invention;
Fig. 6 is the schematic top plan view of concentration module in the module backlight of one embodiment of the invention;
Fig. 7 A-7C be concentration module among Fig. 6 along the cross-sectional view of A-A ' direction, show the partial enlarged drawing of P0, P1 and P2 three place's optically focused micro-structurals respectively;
Fig. 7 D and Fig. 7 E are similar to Fig. 7 B and Fig. 7 C, show second embodiment of the optically focused micro-structural at P1 and P2 two places respectively;
Fig. 7 F and Fig. 7 G are similar to Fig. 7 B and Fig. 7 C, show the 3rd embodiment of the optically focused micro-structural at P1 and P2 two places respectively;
Fig. 8 is the schematic diagram that concerns of the brightness of concentration module optically focused micro-structural one embodiment shown in Figure 6 and viewing angle;
Fig. 9 a be in the concentration module shown in Figure 6 micro-structural along the perspective view of an embodiment of the direction gradual change vertical with the fin bearing of trend;
Fig. 9 b be in the concentration module shown in Figure 6 micro-structural along the perspective view of an embodiment of fin bearing of trend gradual change.
Description of reference numerals:
100 modules backlight
1 backboard
2 reflector plates
3 LGPs
4 times diffusion sheets
5 concentration modules
50,50 ', 50 " fins
52,52 ', 52 " exit planes
54 outgoing cambered surfaces
Diffusion sheet on 6
7 fluorescent tubes
[specific embodiment]
For above-mentioned purpose, feature and advantage can be become apparent more, the specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing.
With reference to Fig. 5, it is the decomposition texture schematic diagram of the module backlight 100 of one embodiment of the invention, for the convenience of explanation, supposes this module 100 horizontal positioned backlight.Module 100 backlight comprises backboard 1, reflector plate (reflector) 2, LGP (LGP:Light Guide Panel) 3, time diffusion sheet 4, concentration module 5, last diffusion sheet 6 and fluorescent tube 7. wherein, fluorescent tube 7 is arranged on the backboard 1, it can be a straight-down negative, also can be side type. this fluorescent tube 7 is line source, for example can be cathode fluorescent tube (CCFL:Cold Cathode Fluorescent Lamp).LGP 3 converts the line source that fluorescent tube 7 sends to area source, and light source passes down diffusion sheet 4, concentration module 5 upward successively and goes up diffusion sheet 6, finally shines the display panels (not shown).The reflector plate 2 reflected back LGP 3 that the light that is mapped to this reflector plate 2 by LGP 3 downwards can be made progress, thus light loss reduced.More excellent, the material of reflector plate 2 is the reflection material with high reflectance.Following diffusion sheet 4 can make the light that sends from fluorescent tube 7 evenly spread, to eliminate the clear zone that forms on the LGP 3.Light directive property after diffusion sheet 4 penetrates down is poor, must revise direction of light, improves positive brightness.Concentration module 5 is exactly to be used for the light axle central area upward from following diffusion sheet 4 is concentrated, to improve the utilization rate of light at display panels vertical direction near zone.Last diffusion sheet 6 prevents that in addition concentration module 5 is by the protection effect of scratch.
The concrete structure of concentration module 5 sees also Fig. 6 and Fig. 7 A-7C.Wherein, Fig. 6 is the vertical view of concentration module 5 in the module backlight 100 of one embodiment of the invention, and the following of concentration module 5 is exiting surface (not label) for advancing light face (not label) above, and shown in Figure 6, exiting surface has geometric center P0.Exiting surface is distributed with many along the linearly extended fin 50 of left and right directions, and these fins 50 equidistantly are arranged in parallel.
Dissect along A-A ' line among Fig. 6, shown in Fig. 7 A-7C, it has shown the section of the optically focused micro-structural of relevant position respectively to the local amplification profile schematic diagram at P0, P1 and P2 three places respectively.In conjunction with Fig. 9 a with reference to figure 6 and Fig. 7 A-7C, wherein, Fig. 9 a be in the concentration module shown in Figure 6 micro-structural along the perspective view of an embodiment of the direction gradual change vertical with the fin bearing of trend.In an embodiment of the present invention, fin 50 forms the optically focused micro-structural, shown in Fig. 7 A in the central area of P0 indication, every fin 50 includes two and is plane exit plane 52 substantially, these two exit planes 52 intersect the angle of 90 degree mutually, form the prism with 90 degree interior angles in fact.Shown in Fig. 7 B and Fig. 7 C, at P1 and P2 place, fin 50 also includes outgoing cambered surface 54, two exit planes 52 of outgoing cambered surface 54 smooth connections, the width of outgoing cambered surface 54 is widened to the edge gradually from exiting surface geometric center P0, and correspondingly, the width of exit plane 52 is constriction gradually.Generally, the width of outgoing cambered surface 54 with respect to the ratio of the width of exit plane 52 to away from the gradual change of exiting surface geometric center P0 direction, away from exiting surface geometric center P0, outgoing cambered surface 54 width of optically focused micro-structural are big more with respect to the ratio of exit plane 52 width more.For convenience of description, the partial structurtes at P0, P1 and P2 three places have only been described here, in fact, the fin 50 of concentration module 5 is symmetrically distributed on above-below direction with respect to the exiting surface geometric center, and P1 and P2 also have the structure identical with P1 and P2 about the symmetric position of geometric center P0.That is to say that these fins 50 are the vertical direction along the bearing of trend of fin 50, from geometric center P0 to the gradual change of exiting surface both sides.
According to the optical principle of prism optically focused, the angle of two exit planes 52 is light harvesting the best of the optically focused micro-structural of 90 degree, and the observed brightness of the vertical angle of exiting surface is the highest, the briliancy half range angle minimum of optically focused micro-structural.The width of outgoing cambered surface 54 is widened to the edge gradually from exiting surface geometric center P0, and correspondingly, the width of exit plane 52 is constriction gradually, and the light harvesting of prism weakens, and the briliancy half range of optically focused micro-structural is contended cumulative big.Please refer to shown in Figure 8ly, it shows the schematic diagram that concerns of the brightness of concentration module optically focused micro-structural shown in Figure 6 and viewing angle.Because the difference of the local optically focused micro-structural at P0, P1 and P2 three places, P0, P1 and the brightness at P2 three places and the relation curve of viewing angle also there are differences.The briliancy half range angle minimum at geometric center P0 place is about 28 degree, and the briliancy half range angle at P1 place is big slightly, is about 34 degree, and the briliancy half range angle maximum at P2 place is about 52 degree.
In conjunction with reference to viewing angle shown in Figure 4, when when the angles of liquid crystal indicator below 15 degree are observed, in fact to the actual observation angle θ of top area
TFor about 45 degree, to the actual observation angle θ of bottom section
BFor approximately-6 spending. according to the schematic diagram that concerns of brightness shown in Figure 8 and viewing angle, the brightness of the corresponding 45 degree viewing angles of top area P2 curve be about 66 candelas/square metre, because the fin 50 of concentration module 5 is symmetrically distributed on above-below direction with respect to exiting surface geometric center P0, the curve of bottom section is identical with top area P2 curve, the brightness of the curve correspondence-6 of bottom section degree viewing angle be about 97 candelas/square metre. the minimax brightness ratio (P of top area and bottom section
B/ P
T) be 97/66 ≈ 1.47, meet TC099, the requirement of 2003 standards 1.5 in.
In like manner, in conjunction with reference to figure 3, when the angles of 30 degree from the right side are observed, to the actual observation angle θ of left area
LFor about 45 degree, to the actual observation angle θ in zone, the right
RBe about 12 degree.If handle with 5 pairs of light optically focused of the concentration module of identical setting, then can observe, the brightness of left area 45 degree viewing angles be about 66 candelas/square metre, the brightness that viewing angles are spent in zone, the right 12 be about 95 candelas/square metre.Brightness ratio (the P of zone, the right and left area
R/ P
L) be 95/66 ≈ 1.44, also meet TCO99, the requirement of 2003 standards 1.7 in.
According to the optical principle of prism optically focused, directions increase gradually or when reducing gradually less than 90 degree directions, the light harvesting of optically focused micro-structural weakens gradually to spending greater than 90 when exit plane 52 angles, and the briliancy half range of optically focused micro-structural is contended cumulative big.Therefore, concentration module 5 can be made second embodiment shown in Fig. 7 D and Fig. 7 E, can also make the 3rd embodiment shown in Fig. 7 F and Fig. 7 G.
See also Fig. 7 D and Fig. 7 E, it is similar to Fig. 7 B and Fig. 7 C, shows second embodiment of the optically focused micro-structural at P1 and P2 two places respectively.In a second embodiment, the central area fin 50 of P0 indication ' the optically focused micro-structural still shown in Fig. 7 A, but fin 50 ' exit plane 52 ' between angle increase gradually to the edge from exiting surface geometric center P0.Shown in Fig. 7 D, the exit plane 52 at P1 place ' between angle greater than geometric center P0 place 90 the degree.Shown in Fig. 7 E, the exit plane 52 at P2 place ' between angle greater than the angle at P1 place.That is to say, the angle between the exit plane of the optically focused micro-structural of fin with respect to exiting surface geometric center P0 up and down direction increase gradually.
See also Fig. 7 F and Fig. 7 G, it is similar to Fig. 7 B and Fig. 7 C, shows the 3rd embodiment of the optically focused micro-structural at P1 and P2 two places respectively.In the 3rd embodiment, the central area fin 50 of P0 indication " the optically focused micro-structural still shown in Fig. 7 A, but the angle between the fin 50 " exit plane 52 " reduces to the edge gradually from exiting surface geometric center P0.Shown in Fig. 7 F, the exit plane 52 at P1 place " between angle less than 90 degree at geometric center P0 place.Shown in Fig. 7 E, the exit plane 52 at P2 place " between angle less than the angle at P1 place.That is to say, the angle between the exit plane of the optically focused micro-structural of fin with respect to exiting surface geometric center P0 up and down direction reduce gradually.
The angle that the fin that above-described embodiment has disclosed exiting surface geometric center P0 position has between the exit plane is the optically focused micro-structurals of 90 degree, thus its light harvesting the best, briliancy half range angle minimum, the observed brightness of the vertical angle of exiting surface is the highest; And the optically focused micro-structural of fin with respect to exiting surface geometric center P0 to bearing of trend both sides gradual change gradually perpendicular to fin, the gradual change of optically focused micro-structural comprises from 90 degree corner angle of geometric center P0 position carries out angle gradient to both sides gradually, be that corner angle increase or reduce to both sides gradually, also comprise from 90 degree corner angle of geometric center P0 position and fade to arc to both sides gradually, thereby its light harvesting weakens gradually, and the briliancy half range is contended decrescence little.
The concentration module 5 of this structure is applied in the module backlight of liquid crystal indicator, can guarantees that the center brightness value of liquid crystal indicator is higher, guaranteed that also liquid crystal indicator has the luminous preferably uniformity simultaneously.
In like manner, at concentration module 5 shown in Figure 6, can also be with respect to the bearing of trend of exiting surface geometric center P0 at fin 50, be on the left and right directions, the gradual change of optically focused micro-structural is set. that is to say that the angle that the fin in exiting surface geometric center P0 position has between the exit plane is the optically focused micro-structural of 90 degree, thus its light harvesting the best, briliancy half range angle minimum, the observed brightness of the vertical angle of exiting surface is the highest; And the optically focused micro-structural of same fin with respect to exiting surface geometric center P0 to bearing of trend both sides gradual change gradually along this fin, the gradual change of optically focused micro-structural comprises equally from 90 degree corner angle of geometric center P0 position carries out angle gradient to both sides gradually, be that corner angle increase or reduce to both sides gradually, also comprise from 90 degree corner angle of geometric center P0 position and fade to arc to both sides gradually, thereby its light harvesting weakens gradually, even it is big that the briliancy half range is contended gradual change. for example, two regional P3 on same fin of exiting surface geometric center P0 position and P4 (as shown in Figure 6), B-B ' and C-C ' line in Fig. 6 dissects respectively, the optically focused micro-structural in P3 and P4 zone also can be carried out gradual change according to the described three kinds of embodiment of for example Fig. 7 A-7G. in conjunction with Fig. 9 b with reference to figure 6 and Fig. 7 A-7G, wherein, Fig. 9 b be in the concentration module shown in Figure 6 micro-structural along the perspective view of an embodiment of fin bearing of trend gradual change. as shown in FIG., fade to the shape of the optically focused micro-structural that is different from this centre from the centre of a fin 50 to direction of both ends, thereby thereby change lightness distribution on the left and right directions of same fin 50 symmetrically away from the centre. reach the brightness of concentration module optically focused micro-structural as shown in Figure 8 and the graph of a relation of viewing angle equally.
Further, the optically focused micro-structural of the fin of concentration module 5 can be with respect to exiting surface geometric center P0 simultaneously to perpendicular to the bearing of trend both sides of fin and to the bearing of trend both sides gradual change along fin.
Though the present invention with preferred embodiment openly as above; but it is not to be used for limiting the present invention; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that claim of the present invention was defined.
Claims (10)
1. a concentration module (5), it comprises exiting surface and a plurality of optically focused micro-structural, this exiting surface has geometric center (P0), the light of each optically focused micro-structural has the maximum brightness of penetrating at certain orientation, brightness was reduced to half of maximum ejaculation brightness when the angle of light ejaculation direction and aforementioned certain orientation was briliancy half range angle, it is characterized in that: the optically focused micro-structural from the geometric center (P0) of exiting surface to away from the gradual change of geometric center (P0) direction, away from the geometric center (P0) of exiting surface, the briliancy half range angle of optically focused micro-structural is big more more.
2. concentration module according to claim 1 (5), it is characterized in that: in exiting surface, be distributed with many fins (50,50 ', 50 "); fin (50,50 ', 50 ") form the optically focused micro-structural, every fin (50,50 ', 50 ") include two and are plane exit plane (52,52 ', 52 ") substantially, these two exit planes (52,52 ', 52 ") are in certain angle.
3. concentration module according to claim 2 (5) is characterized in that: the closer to exiting surface geometric center (P0), the exit plane of optically focused micro-structural (52,52 ', the angle of 52 ") is more near 90 degree.
4. concentration module according to claim 3 (5), it is characterized in that: the exit plane of each optically focused micro-structural (52,52 ', the angle of 52 ") is to away from the gradual change of exiting surface geometric center (P0) direction; more away from exiting surface geometric center (P0), the exit plane of optically focused micro-structural (52,52 ', the angle of 52 ") is big or more little more.
5. concentration module according to claim 3 (5), it is characterized in that: also include outgoing cambered surface (54) to small part fin (50), outgoing cambered surface (54) two exit planes of smooth connection (52), outgoing cambered surface (54) with respect to the ratio of the width of exit plane (52) to away from the gradual change of exiting surface geometric center (P0) direction, away from exiting surface geometric center (P0), outgoing cambered surface (54) width of optically focused micro-structural is big more with respect to the ratio of exit plane (52) width more.
6. according to each described concentration module (5) in the aforementioned claim 2 to 5, it is characterized in that: each bar fin (52,52 ', 52 ") equidistantly are arranged in parallel.
7. concentration module according to claim 6 (5), it is characterized in that: every fin (52,52 ', 52 ") are in fact along the straight extension of straight line, each bar fin (52,52 ', the shape of 52 ") optically focused micro-structural is along the direction gradual change vertical with described straight line.
8. concentration module according to claim 6 (5) is characterized in that: each bar fin (52,52 ', the optically focused micro-structural of 52 ") fades to the shape of the optically focused micro-structural that is different from this centre to the direction of both ends away from the centre from the centre of this fin (52,52 ', 52 ").
9. concentration module according to claim 6 (5) is characterized in that: fin (52,52 ', the optically focused micro-structural of 52 ") with respect to exiting surface geometric center (P0) simultaneously to perpendicular to the bearing of trend of fin and to bearing of trend both sides gradual change along fin.
10. a module backlight (100), it comprises fluorescent tube (7), it is characterized in that:
It also comprises aforementioned 1 to 9 each described concentration module (5), and concentration module (5) is positioned at fluorescent tube (7) top, is used for the light that below fluorescent tube (7) sends is focused on top certain angle scope bright dipping.
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| CN2009101986498A CN101706081B (en) | 2009-11-11 | 2009-11-11 | Light-focusing module and backlight module |
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| CN101706081B CN101706081B (en) | 2011-10-19 |
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| CN102289025A (en) * | 2011-07-20 | 2011-12-21 | 深圳市华星光电技术有限公司 | Light guide plate and back light module |
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| CN108646465A (en) * | 2018-03-06 | 2018-10-12 | 友达光电股份有限公司 | Display device |
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| CN1284011C (en) * | 2003-07-18 | 2006-11-08 | 财团法人工业技术研究院 | Composite microstructure slice for diffusion and condensation |
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| CN102289025A (en) * | 2011-07-20 | 2011-12-21 | 深圳市华星光电技术有限公司 | Light guide plate and back light module |
| WO2018120503A1 (en) * | 2016-12-27 | 2018-07-05 | 惠科股份有限公司 | Liquid crystal display device and prism sheet thereof |
| CN109058935A (en) * | 2017-11-27 | 2018-12-21 | 达运精密工业股份有限公司 | Light supply apparatus and light-source system |
| CN109058935B (en) * | 2017-11-27 | 2020-07-24 | 达运精密工业股份有限公司 | Light source device and light source system |
| CN108646465A (en) * | 2018-03-06 | 2018-10-12 | 友达光电股份有限公司 | Display device |
| CN110133910A (en) * | 2019-04-25 | 2019-08-16 | 昆山龙腾光电有限公司 | Concentration module, backlight module and display device |
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Address after: 215301 No. 1, Longteng Road, Kunshan, Jiangsu Patentee after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301 No. 1, Longteng Road, Kunshan, Jiangsu Patentee before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |