CN1858635A - LCD back light source producing method - Google Patents
LCD back light source producing method Download PDFInfo
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- CN1858635A CN1858635A CNA2005100694954A CN200510069495A CN1858635A CN 1858635 A CN1858635 A CN 1858635A CN A2005100694954 A CNA2005100694954 A CN A2005100694954A CN 200510069495 A CN200510069495 A CN 200510069495A CN 1858635 A CN1858635 A CN 1858635A
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Abstract
This invention relates to a generating method for LCD back light source by matching a design of the lens curvature and a LED light source to emit rays covering wider sphere including: providing a lens set with an incident light face, an exit light face and a LED light source, covering said lens on said LED light source to let the scattered light rays of the LED source inject from the incident face from large to small from the central shaft to outside of the arc curvature then emit it out of the lens from the exit face from small to large arc curvature from the central shaft to outside.
Description
Technical field
The invention relates to a kind of LCD (liquid crystal display, LCD) backlight, especially a kind of design that utilizes phacoid curvature, and cooperation light emitting diode (LED) light source, the LCD back light source producing method that the angular range that the led light source emergent ray is contained is more wide.
Background technology
LCD is owing to have in light weight, the characteristic that volume is little, therefore by the display device of mini-plants such as past notebook computer, progressively use and the existing trend that replaces traditional C RT screen or TV, it is also along with the performance of zero device improves, make specifications such as LCD panel size, brightness, contrast, also improve all the time promote in the middle of.LCD can be divided into reflection-type and penetrating type two classes according to the mode of light source generation image, and early stage LCD is many based on reflection-type, is that market is large with penetrating type LCD mainly then at present.Penetrating type LCD then can divide according to the position of light source setting and makes side-light type (side-edge) and straight-down negative (direct type) backlight mode, the light source of side-light type LCD is arranged at light guide plate (light guide) two left and right sides sides or four side place, make light via the total reflection effect of light guide plate and the set diffusion point of diffusion sheet of light guide plate below, light is penetrated from the light guide plate surface equably, and then see through liquid crystal panel again, present image.
Yet, under the growth requirement of large LCD, the image contrast of watching visual angle, distinctness of enough video picture brightness, broadness and long serviceable life, become the topmost emphasis of research and development, thereby under this kind standard-required, the backlight module form of straight-down negative just becomes the technology main flow of large LCD development.The backlight module of known straight-down negative sees also Fig. 1, and general LCD is that the liquid crystal panel 10 by the first half provides the backlight module 20 of light source to be constituted with Lower Half.Backlight module 20 mainly comprises a prismatic lens 21, a diffusion barrier 22, a light guide plate 23, a reflex housing 24 and a light source 25.The light source 24 of the direct type backlight module that is used in comprises electroluminescence (EL), cold-cathode fluorescence lamp (CCFL), emission of cathode lamp (CCL) or metal-halide lamp etc. at present, and is wherein most widely used with cold-cathode fluorescence lamp.The light that light source 24 is launched be directly penetrate light guide plate 23 and with prismatic lens 21 with light distribution effect and diffusion barrier 22, and can penetrate by backlight module 10 surfaces uniformly, and transmission enters in the liquid crystal panel 10.
Direct type backlight module with general use cold-cathode fluorescence lamp is compared with side light type back light module, because of the former is provided with more fluorescent tube number, and light can directly penetrate light guide plate (some even be not provided with light guide plate), can avoid the leakage of some sidelights, and whole briliancy and luminous efficacy are significantly promoted.Yet, when the fluorescent tube number increases, the heat energy that it produced is also more, the temperature that caused raises also can to liquid crystal molecule or chromatic photoresist exerts an influence, and the phenomenon of color mutation is arranged, usually the thickness of backlight module must be increased, lowering this kind interference, thereby have to strengthen the thickness volume of LCD.In addition, arranged evenly between fluorescent tube quite be easy to generate the situation of light and shade striped, and degree of registration produces certain influence.
Therefore once there was the backlight module that utilizes led light source to replace cold-cathode fluorescence lamp to produce, volume is little, heat production is low, power consumption is low, the characteristic of long service life because led light source has, add recent improvement of Manufacturing Technology, its luminosity constantly promotes, and its manufacturing cost also reduces gradually, progressively be applied in the various light fixture at present, future, led light source more may replace present bulb or daylight lamp source, and become most important luminescence component in the light fixture, but the problem that still has it to exist as the LCD backlight with led light source.See also Fig. 2, existing with 2 θ
1/2Surface adhesion type (SMD) led light source 30 that is 120 degree is example (θ
1/2Be meant that the LED luminous intensity values is that axial strength is worth this direction of a half and axial angle, 2 times of θ
1/2Be the visual angle), itself and irradiating surface are under the situation of X in distance, calculate if shine the illumination that can contain in the circumference range that diameter is an X length with it, can only reach 65% uniformity coefficient.Please consult simultaneously and comparison diagram 3, this figure is the graph of a relation of led light source luminous intensity and lighting angle, as we know from the figure, lighting angle is for axially being 0 when spending, the luminous intensity of LED is the highest, but along with off-axis to angle increase gradually, its luminous intensity then geometric ratio reduces.Therefore LED central authorities are the brightest, more then geometric ratio deepening of next door.After the led light source divergent rays, shine illuminated when surface, under equidistant situation, should distribute according to the similar ratio of light intensity in principle, but system shines on a plane because of led light source, and its disperse is than the light of wide-angle, and is far away with the distance on illuminated surface, and irradiated area is bigger, and it is many that its illumination is relatively upward reduced.Therefore can't distribute according to former led light source intensity, and be the circumferential area edge of X, form the uniformity coefficient that circumferential center illumination 65% is only arranged at diameter length.Therefore, under the demand of certain uniformity coefficient, its area that can contain is narrower, also can be evenly if desire to make its light area to be abound with, and it just must be provided with considerable led light source on large size panel, and this will expend suitable cost; If number deficiency is set, then can't overcome aforementioned light and dark every and the disappearance of uneven illumination, and have influence on the quality of video picture.
Summary of the invention
Utilize the high heat production of cold-cathode fluorescence lamp and spend relatively poor shortcoming together for improving known LCD backlight, the present invention will provide a kind of design that utilizes phacoid curvature, and cooperated with LED light source, with LCD back light source producing method as LCD backlight source, the range of exposures of led light source under certain uniformity coefficient condition increased, even in this scope, promote its irradiation uniformity coefficient, and can reduce the number that LED is provided with in the backlight module simultaneously, to reduce the cost of manufacture of backlight module.
LCD back light source producing method of the present invention comprises: a phacoid is provided, and this phacoid is provided with an incidence surface and an exiting surface; One led light source is provided; This phacoid cover is placed on this led light source; And the light that makes the led light source scattering from cambered surface curvature system by central shaft from large to small this incidence surface incident laterally, this exiting surface that is changed from small to big laterally by central shaft from cambered surface curvature system again penetrates this phacoid thereafter.
The LCD back light source producing method according to the present invention, the light that led light source is dispersed, the refraction through this phacoid changes the angle of former beam projecting, thereby makes the angle of whole emergent ray become big, and can contain bigger area.On the other hand, then change the distribution of emergent ray intensity simultaneously, make the originally axial stronger zone of central ray intensity, toward and axially than the two ends skew of wide-angle, the intensity of the big light of shooting angle is strengthened, and reduce the axis of centres to light intensity, so that the light that led light source sent can be after penetrating the inner segment distance of this phacoid, when shining, uniformity coefficient is reduced, can increase more than the uniformity coefficient to 75% on the contrary than peripheral and longer-distance surface.Therefore, utilize the inventive method, can make led light source the time as the backlight of LCD, can maintain under the level than high evenness, irradiation is contained more known led light source and can be shone the zone of containing 4 times to 49 times of areas, and one side makes the uniformity coefficient raising on illuminated surface, on the other hand then because of the significantly amplification of irradiated area, can dispose less led light source, thereby the advantage that significantly reduces equipment cost is also arranged.
Below will cooperate the graphic embodiments of the present invention that further specify; following cited embodiment is in order to illustrate the present invention; be not in order to limit scope of the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; should make a little change and revise, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Description of drawings
Fig. 1 is the synoptic diagram of known LCD backlight module;
Fig. 2 is the synoptic diagram of known LED illumination;
Fig. 3 is the graph of a relation of known led light source luminous intensity and lighting angle;
Fig. 4 is the exploded perspective synoptic diagram of embodiment of the invention LCD backlight;
Fig. 5 is the cut-open view of embodiment of the invention phacoid;
Fig. 6 is the optical path synoptic diagram of embodiment of the invention LCD backlight;
Fig. 7 is the graph of a relation of embodiment of the invention LCD backlight luminous intensity and lighting angle;
Fig. 8 is the synoptic diagram of embodiment of the invention LCD backlight illumination.
Among the figure
10 liquid crystal panels, 40 phacoiies
20 backlight modules, 41 incidence surfaces
21 prismatic lenses, 42 exiting surfaces
22 diffusion sheets, 50 pedestals
23 light guide plate, 60 central shafts
24 reflex housing X distances
25 light source Y diameters
30 led light source Z blooming pieces
40 phacoiies, 42 exiting surfaces
41 incidence surfaces, 60 central shafts
Embodiment
See also Fig. 4, Fig. 4 is the exploded perspective synoptic diagram of embodiment of the invention LCD backlight.LCD back light source producing method of the present invention at first provides a phacoid 40, and a led light source 30 is provided again, then phacoid 40 covers are placed on the described led light source 30, but 30 of this led light sources further lotus root are connected on the pedestal 50, in order to electrically connect, and provide power supply.
See also Fig. 5, this figure is the cut-open view of embodiment of the invention phacoid.Phacoid 40 is the circular-arc mirror bodies of a hemisphere, and it has an incidence surface 41 and an exiting surface 42.Incidence surface 41 is circular arc concave surfaces, and itself and aforesaid led light source 30 connect (seeing also Fig. 4), and exiting surface 42 then is an arc convex surface, this arc convex surface then in the backlight module near this end of LED-backlit source blooming piece.
Please continue to consult Fig. 5, the arc concave surface of incidence surface 41 is a central point with central shaft 60, its curvature by central shaft 60 laterally, by diminishing greatly gradually.That is, as shown shown in, the angle of minute surface tangent line and central shaft 60, is diminished to the c angle to the b angle more gradually by a angle.The arc convex surface curvature of exiting surface 42 is then changed from small to big laterally by central shaft 60, that is as shown, the angle of minute surface tangent line and central shaft 60 to the B angle, becomes big to the C angle by the A angle more gradually.
Therefore, see also Fig. 6, by the light that led light source 30 is launched, through refraction for the first time, those light by after the refraction for the second time of exiting surface 42 processes, penetrate this phacoid 30 again when entering phacoid 30 by incidence surface 41.Curvature near central shaft 60 is big more more owing to incidence surface 41, therefore the light refraction angle by this place's incident is also big more, its easy more past both sides branch is scattered, and away from the exterior lateral area of central shaft 60, then because curvature is little, the refraction angle that produces is little, and therefore the light at two side directions does not have bigger deviation.When these light touch exiting surface 42, then because littler the closer to the curvature of central shaft 60, its refraction angle is also more little, the light angle deviation of outgoing originally is little, but away from the exterior lateral area of central shaft 60, then becomes big because of curvature, refraction angle also increases, further make these emergent lights toward central shaft 60 both sides skews, make the emergent ray of led light source 30, significantly increase the zone of its irradiation.
It also reflects the LCD back light source producing method of the embodiment of the invention owing to light is offset toward both sides simultaneously, to make that the light intensity of both sides is strong than the light of central shaft side's line, so Strengthenable is launched farther and the wider light intensity that distributes by the outer both sides of central shaft, when making its blooming piece that is radiated at the LCD backlight, can keep suitable illumination, and the uniformity coefficient in WBR zone is improved.See also Fig. 7, this figure is the graph of a relation of its luminous intensity of embodiment of the invention LCD backlight and lighting angle.From figure, can find, lighting angle is that axial direction is 0 when spending, the luminous intensity of led light source of the present invention has been reduced to by the maximum intensity of aforementioned (seeing also Fig. 3) and has been almost minimum intensity, and along with the increase gradually that departs from axial angle, its luminous intensity reaches the top when 70 spend, when angle continued to increase again, its luminous intensity then reduced rapidly.
Be noted that, be embodiment of the invention LCD light source 30 upper shield phacoiies 40 herein after, the distribution relation of luminous " intensity " and lighting angle.The light that is penetrated by phacoid 40 still will further shine on the blooming piece Z (please consulting Fig. 8 earlier) of backlight module, when therefore these irradiate light are distributed on the blooming piece Z, because the difference of distance and irradiated area, its illumination will be changed, and can not distribute according to the ratio of light intensity.Though near axially and angle is less that its intensity of emergent ray is lower, its irradiation distance is short among the present invention, the area that is spread is little, so illumination will reduce slightly; And the bigger light of shooting angle, the distance on itself and illuminated surface is far away, and the zone of diffusion is bigger, the light beam illumination that is distributed on the per unit area is reduced, originally can cause lighting angle bigger the rapid drawdown of outgoing illuminance, because bigger its intensity of emergent light of lighting angle significantly increases because of the refraction of phacoid 40, so the uniformity of illuminance of its edge still can be kept certain degree but in the present invention.
See also Fig. 8, the embodiment of the invention can further be stamped cover the led light source 30 of phacoid 40, is arranged in the LCD backlight module the place, blooming piece Z below near led light source, and blooming piece Z to the distance that cover is stamped the led light source 30 of phacoid 40 be X; And after making the refraction of light via phacoid 40 of led light source 30 ejaculations, shining the last diameter of blooming piece Z is in the circumferential area of Y length.Wherein, led light source can be the LED of SMD type, or the LED of other form, and its glow color then can be white light or other other coloured light according to need.In present embodiment, the length of diameter Y can reach 2～7 times of X length, and the light uniformity coefficient in this circumferential area can reach more than 75%.That is when axial 0 degree of led light source penetrates when the light illumination of blooming piece Z is calculated with 100, these are that the light illumination of the circumferential edges of Y length then has more than 75 at diameter.
Therefore, by LCD back light source producing method of the present invention, utilize the effect of luminous intensity distribution again of a phacoid 40, the regional extent that can make its irradiation of LED-backlit source is under the condition of uniformity coefficient more than 75%, more known led light source shines the area contained increases by 4 times to 49 times more than, and the uniformity coefficient on illuminated surface is improved, on the other hand then because of the significantly amplification of irradiated area, less led light source can be disposed in the backlight module of LCD, thereby also the required cost of equipment can be significantly reduced.
The present invention also can be provided with several in exiting surface 42 surfaces of phacoid and be the lens bar that concentric circles distributes, and the curvature of these lens bars can be zero, just or for negative.It also can be covered with a plurality of little luminous intensity distribution minute surfaces with diamond face arrangement mode on exiting surface 42 surfaces, and the curvature of these little luminous intensity distribution minute surfaces also can be zero, just or for negative, wherein, each little its level of luminous intensity distribution minute surface also can be identical or different with the curvature of Z-axis picture.Setting by lens bar and little luminous intensity distribution minute surface can make emergent light of the present invention produce the effect of common factor mixed light, makes the light of ejaculation more even, and can promote the quality of video picture.
Claims (5)
1. LCD back light source producing method comprises:
One phacoid is provided, and this phacoid is provided with an incidence surface and an exiting surface;
One led light source is provided;
This phacoid cover is placed on this led light source; And
The light that makes the led light source scattering is by central shaft from large to small this incidence surface incident laterally from cambered surface curvature, is to penetrate this phacoid by this exiting surface that central shaft changes from small to big laterally from cambered surface curvature more thereafter.
2. LCD back light source producing method as claimed in claim 1, this led light source that can further cover be stamped this phacoid is arranged in the LCD backlight module near X distance below the blooming piece of led light source, and after making the refraction of light that led light source penetrates, shine that diameter is in the circumferential area of 2X～7X length on this blooming piece via phacoid.
3. LCD back light source producing method as claimed in claim 2 is characterized in that, wherein this diameter be in the circumferential area of 2X～7X length its light uniformity coefficient more than 75%.
4. as claim 1,2 or 3 described LCD back light source producing methods, it is characterized in that wherein this led light source is a white light LEDs.
5. as claim 1,2 or 3 described LCD back light source producing methods, it is characterized in that wherein this led light source is a surface adhesion type LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100694954A CN100378543C (en) | 2005-04-30 | 2005-04-30 | LCD back light source producing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100694954A CN100378543C (en) | 2005-04-30 | 2005-04-30 | LCD back light source producing method |
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| CN1858635A true CN1858635A (en) | 2006-11-08 |
| CN100378543C CN100378543C (en) | 2008-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100694954A Expired - Fee Related CN100378543C (en) | 2005-04-30 | 2005-04-30 | LCD back light source producing method |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7837360B2 (en) | 2006-12-19 | 2010-11-23 | Lg Display Co., Ltd. | Optical module |
| CN102425761A (en) * | 2011-12-29 | 2012-04-25 | 四川鋈新能源科技有限公司 | Integrated high-power encapsulated LED (Light-Emitting Diode) light source optical lens and street lamp using same |
| CN102472447A (en) * | 2009-07-21 | 2012-05-23 | 夏普株式会社 | Lens unit, light emitting module, illumination device, display device, and television receiving device |
| CN102498327A (en) * | 2009-06-15 | 2012-06-13 | 夏普株式会社 | Light-emitting module, illumination device, display device, and television receiver |
| CN102656401A (en) * | 2009-11-30 | 2012-09-05 | 夏普株式会社 | Light emitting module, planar light source, liquid crystal display device, and illumination device |
| CN101191942B (en) * | 2006-11-22 | 2012-10-10 | 奇美电子股份有限公司 | Backlight module and LCD device |
| CN103574393A (en) * | 2012-08-03 | 2014-02-12 | 鸿富锦精密工业（深圳）有限公司 | LED (light-emitting diode) light source module and direct type LED television |
| CN104296072A (en) * | 2014-10-09 | 2015-01-21 | 青岛海信电器股份有限公司 | Luminescent device and backlight source |
| CN106597755A (en) * | 2017-03-06 | 2017-04-26 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN114755752A (en) * | 2022-04-14 | 2022-07-15 | 武汉华星光电技术有限公司 | Backlight module |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6547423B2 (en) * | 2000-12-22 | 2003-04-15 | Koninklijke Phillips Electronics N.V. | LED collimation optics with improved performance and reduced size |
| US6598998B2 (en) * | 2001-05-04 | 2003-07-29 | Lumileds Lighting, U.S., Llc | Side emitting light emitting device |
| US6896381B2 (en) * | 2002-10-11 | 2005-05-24 | Light Prescriptions Innovators, Llc | Compact folded-optics illumination lens |
| JP2005079244A (en) * | 2003-08-29 | 2005-03-24 | Sanyo Electric Co Ltd | Light emitting diode |
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2005
- 2005-04-30 CN CNB2005100694954A patent/CN100378543C/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101191942B (en) * | 2006-11-22 | 2012-10-10 | 奇美电子股份有限公司 | Backlight module and LCD device |
| US7837360B2 (en) | 2006-12-19 | 2010-11-23 | Lg Display Co., Ltd. | Optical module |
| CN102498327A (en) * | 2009-06-15 | 2012-06-13 | 夏普株式会社 | Light-emitting module, illumination device, display device, and television receiver |
| CN102472447A (en) * | 2009-07-21 | 2012-05-23 | 夏普株式会社 | Lens unit, light emitting module, illumination device, display device, and television receiving device |
| CN102656401B (en) * | 2009-11-30 | 2015-09-16 | 夏普株式会社 | Surface source of light, liquid crystal display and lighting apparatus |
| CN102656401A (en) * | 2009-11-30 | 2012-09-05 | 夏普株式会社 | Light emitting module, planar light source, liquid crystal display device, and illumination device |
| US9091882B2 (en) | 2009-11-30 | 2015-07-28 | Sharp Kabushiki Kaisha | Light emitting module, surface light source, liquid crystal display, and illuminating device |
| CN102425761A (en) * | 2011-12-29 | 2012-04-25 | 四川鋈新能源科技有限公司 | Integrated high-power encapsulated LED (Light-Emitting Diode) light source optical lens and street lamp using same |
| CN103574393A (en) * | 2012-08-03 | 2014-02-12 | 鸿富锦精密工业（深圳）有限公司 | LED (light-emitting diode) light source module and direct type LED television |
| CN104296072A (en) * | 2014-10-09 | 2015-01-21 | 青岛海信电器股份有限公司 | Luminescent device and backlight source |
| US9960327B2 (en) | 2014-10-09 | 2018-05-01 | Hisense Electric Co., Ltd. | Light emitting device and display equipment |
| CN106597755A (en) * | 2017-03-06 | 2017-04-26 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN114755752A (en) * | 2022-04-14 | 2022-07-15 | 武汉华星光电技术有限公司 | Backlight module |
| CN114755752B (en) * | 2022-04-14 | 2023-11-28 | 武汉华星光电技术有限公司 | Backlight module |
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| CN100378543C (en) | 2008-04-02 |
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Owner name: CIJIAN SCIENCE AND TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: JUHONG ELECTRONICS CO., LTD. Effective date: 20110118 |
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