CN102086992B - Backlight module and application thereof - Google Patents
Backlight module and application thereof Download PDFInfo
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- CN102086992B CN102086992B CN200910253165.9A CN200910253165A CN102086992B CN 102086992 B CN102086992 B CN 102086992B CN 200910253165 A CN200910253165 A CN 200910253165A CN 102086992 B CN102086992 B CN 102086992B
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- guide plate
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- incidence surface
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Abstract
The invention relates to a backlight module and application thereof. The backlight module at least comprises a light guide plate, a light emitting diode (LED) light source module and a reflector, wherein the light guide plate is provided with an incident surface; the LED light source module is arranged beside the incident surface; the reflector is provided with an opening which is adjacent to the incident surface; the LED light source module is arranged in the reflector and emits incident light towards the incident surface through the opening; and the height of the opening is less than the thickness of the light guide plate. The backlight module can effectively relieve a bright spot phenomenon.
Description
Technical field
The present invention relates to a kind of backlight module, and particularly relate to one and effectively can alleviate the backlight module of bright spot (Hot Spot) phenomenon and the application on liquid crystal display (LCD) thereof.
Background technology
Please refer to Figure 1A, it illustrates the partial cutaway schematic view of conventional backlight module.Backlight module 100 mainly comprises light guide plate 102, LED light-source module 106 and reflector 116, wherein LED light-source module 106 is arranged on by the side of light guide plate 102, and reflector 116 is around in the outside of LED light-source module 106 and jointly surrounds LED light-source module 106 with light guide plate 102.Reflector 116 is made up of three side plates 118,120 and 122, and its latus inframedium 118 and 120 is bonded on the opposite end of side plate 122 respectively, and side plate 118 and 120 toward each other.LED light-source module 106 mainly comprises circuit board 110 and several light emitting diode 108, and wherein these light emitting diodes 108 are arranged on the surface of circuit board 110.In LED light-source module 106, each light emitting diode 108 all has exiting surface 112.The side that light guide plate 102 is adjacent to LED light-source module 106 has incidence surface 104.
In backlight module 100, in the space that the side plate 118,120 and 122 that LED light-source module 106 is arranged on reflector 116 is formed, and circuit board 110 is sticked on the side plate 118 of reflector 116.Light guide plate 102 is arranged on the circuit board 110 of LED light-source module 106, wherein the incidence surface 104 of light guide plate 102 is facing with the exiting surface 112 of all light emitting diodes 108, and the incidence surface 104 of the exiting surface 112 of light emitting diode 108 and light guide plate 102 near, as shown in Figure 1A.
But, please refer to shown in Figure 1B, because light emitting diode 108 is spot light, therefore in backlight module 100, brighter close to light emitting diode 108 part, and region between two light emitting diodes 108 is comparatively dark, such phenomenon is commonly referred to as bright spot ripple (Hot Spot Mura) 114.Bright spot ripple 114 can affect the uniformity of the light source that backlight module 100 provides, and then can reduce display quality.
For bright spot phenomenon, settling mode common at present adopts photomask or glue frame to cover the region of brightness irregularities.But such mode can increase the width of the edge frontal region between visible area to backlight module edge, and is unfavorable for the Miniaturization Design of current backlight module.
The another kind of mode solving bright spot phenomenon is the spacing (Pitch) of the light emitting diode by reducing LED light-source module, to improve bright spot ripple through the density of setting increasing light emitting diode.But the mode of the spacing of reduction light emitting diode can cause the cost of backlight module to improve, and the settling mode of non-good.
Summary of the invention
Therefore, an aspect of of the present present invention is providing a kind of backlight module exactly, its both up and down that can limit light emitting diode to rising angle, the light that control light emitting diode sends thus enters the angle of light guide plate, and light is more penetrated from the exiting surface of light guide plate after the central authorities of visible area advance again, therefore effectively can alleviate the bright spot ripple of the light inlet even eliminating light guide plate.
Another aspect of the present invention is providing a kind of backlight module, its bright spot phenomenon can obtain significantly to be improved or eliminates, therefore can increase the spacing of the light emitting diode of LED light-source module, and the usage quantity of light emitting diode can be reduced, and the edge frontal region of backlight module can be reduced.
Another aspect of the present invention is providing a kind of liquid crystal display, and it under the dimensions taking into account display, can reduce or eliminate the bright spot ripple of backlight module, therefore under original dimensions, can effectively promote the display quality of liquid crystal display.
According to above-mentioned purpose of the present invention, propose a kind of backlight module, at least comprise: light guide plate has incidence surface; LED light-source module is located at by incidence surface; And reflector, have opening and be adjacent to incidence surface, wherein LED light-source module to be arranged in reflector and via opening towards incidence surface incident light, the height of opening is less than the thickness of light guide plate.
According to object of the present invention, propose a kind of liquid crystal display, at least comprise display panels and be located at the backlight module at the back side of display panels.Wherein, this backlight module at least comprises: light guide plate, has incidence surface; LED light-source module, is located at by incidence surface; And reflector, have opening and be adjacent to incidence surface, wherein LED light-source module to be arranged in reflector and via opening towards incidence surface incident light, the height of opening is less than the thickness of light guide plate.
Accompanying drawing explanation
Figure 1A illustrates the partial cutaway schematic view of conventional backlight module.
Figure 1B illustrates the schematic top plan view of conventional backlight module.
Fig. 2 A illustrates the partial cutaway schematic view of a kind of backlight module according to the first preferred embodiment of the present invention.
Fig. 2 B illustrates the partial cutaway schematic view of a kind of backlight module according to the second preferred embodiment of the present invention.
Fig. 2 C illustrates the partial cutaway schematic view of a kind of backlight module according to the 3rd preferred embodiment of the present invention.
Fig. 2 D illustrates the partial cutaway schematic view of a kind of backlight module according to the 4th preferred embodiment of the present invention.
Fig. 3 A distance illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness of light guide plate is 4mm, and when the opening of reflector is 4mm, the brightness distribution curve figure obtained.
Fig. 3 B distance illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness of light guide plate is 4mm, and when the opening of reflector is 3.8mm, the brightness distribution curve figure obtained.
Fig. 3 C distance illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness of light guide plate is 4mm, and when the opening of reflector is 3.6mm, the brightness distribution curve figure obtained.
Fig. 3 D distance illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness of light guide plate is 4mm, and when the opening of reflector is 3mm, the brightness distribution curve figure obtained.
Fig. 3 E distance illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness of light guide plate is 4mm, and when the opening of reflector is 2.4mm, the brightness distribution curve figure obtained.
The thickness that Fig. 4 A illustrates when light guide plate is 4mm, and the opening of reflector is 3.6mm, and when the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, the brightness distribution curve figure obtained.
The thickness that Fig. 4 B illustrates when light guide plate is 4mm, and the opening of reflector is 3.6mm, and when the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.5mm, the brightness distribution curve figure obtained.
The thickness that Fig. 4 C illustrates when light guide plate is 4mm, and the opening of reflector is 3.6mm, and when the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.08mm, the brightness distribution curve figure obtained.
The thickness that Fig. 4 D illustrates when light guide plate is 4mm, and the opening of reflector is 3mm, and when the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, the brightness distribution curve figure obtained.
The thickness that Fig. 4 E illustrates when light guide plate is 4mm, and the opening of reflector is 3mm, and when the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.5mm, the brightness distribution curve figure obtained.
The thickness that Fig. 4 F illustrates when light guide plate is 4mm, and the opening of reflector is 2.4mm, and when the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, the brightness distribution curve figure obtained.
The thickness that Fig. 4 G illustrates when light guide plate is 4mm, and the opening of reflector is 2.4mm, and when the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.5mm, the brightness distribution curve figure obtained.
The thickness that Fig. 4 H illustrates when light guide plate is 4mm, and the opening of reflector is 1.8mm, and when the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 0.9mm, the brightness distribution curve figure obtained.
Fig. 5 illustrates the partial cutaway schematic view of a kind of liquid crystal display according to the preferred embodiment of the present invention.
Description of reference numerals
100: backlight module 102: light guide plate
104: incidence surface 106: LED light-source module
108: light emitting diode 110: circuit board
112: exiting surface 114: bright spot ripple
116: reflector 118: side plate
120: side plate 122: side plate
300a: backlight module 300b: backlight module
300c: backlight module 300d: backlight module
302a: light guide plate 302b: light guide plate
304: LED light-source module
306: light emitting diode 308: circuit board
310a: reflector 310b: reflector
310c: reflector 312:C type structure
314a: extension 314b: extension
314c: extension 316: end
318: exiting surface 320: incidence surface
322a: opening 322b: opening
322c: opening 324a: highly
324b: height 324c: highly
326: thickness 327: distance
328: light 330: lead angle district
332: non-lead angle district 334: highly
336: exiting surface 338: back of the body frame
340: fixing projection 342: snap fit
344: front frame 346: fixing hole
348: perforate 350: figure
352: figure 354: figure
358: figure 360: figure
364: figure 366: figure
370: figure 372: figure
376: figure 378: figure
380: figure 381: figure
382: figure 384: figure
385: figure 387: figure
388: figure 390: figure
391: figure 393: figure
394: figure 396: figure
397: figure 399: figure
400: liquid crystal display 402: display panels
403: figure 404: figure
405: figure 406: figure
AA ': longitudinal axis BB ': transverse axis
Detailed description of the invention
Please refer to Fig. 2 A, it illustrates the partial cutaway schematic view of a kind of backlight module according to the first preferred embodiment of the present invention.In the exemplary embodiments, backlight module 300a at least comprises light guide plate 302a, LED light-source module 304 and reflector 310a.Wherein, the side of light guide plate 302a has incidence surface 320, and the opposite side adjacent with this side of light guide plate 302a then has exiting surface 336.LED light-source module 304 is arranged in reflector 310a, and the incidence surface 320 that LED light-source module 304 and the combination of reflector 310a are arranged on light guide plate 302a is other.Light guide plate 302a has thickness 326.In an embodiment, light guide plate 302a can be such as wedge-shaped board structure or slab construction.Wherein, when light guide plate 302a is the consistent slab construction of thickness essence, the thickness at incidence surface 320 place can represent the thickness 326 of light guide plate 302a; And when light guide plate 302a is wedge-shaped board structure, the thickness 326 of light guide plate 302a is the thickness of the thick adopting whole light guide plate 302a, be usually the thickness at incidence surface 320 place.LED light-source module 304 mainly comprises circuit board 308 and several light emitting diode 306, wherein each light emitting diode 306 all has exiting surface 318, and these light emitting diodes 306 are arranged on the surface of circuit board 308, the exiting surface 318 of each light emitting diode 306 is relative with the incidence surface 320 of light guide plate 302a.
Reflector 310a at least comprises C type structure 312 and two extension 314a, and wherein C type structure 312 has perforate 348, and this two extension 314a is bonded on the two ends 316 of the perforate 348 of C type structure 312 respectively.In this exemplary embodiment, each extension 314a is dull and stereotyped, and this two extension 314a is with substantial level and between the mode the be parallel to each other two ends 316 that are arranged on the perforate 348 of C type structure 312 and the incidence surface 320 of light guide plate 302a, and opening 322a is formed before the incidence surface 320 of light guide plate 302a, that is the opening 322a of reflector 310a is adjacent to the incidence surface 320 of light guide plate 302a, therefore LED light-source module 304 can via opening 322a towards incidence surface 320 incident light of light guide plate 302a.The distance of the incidence surface 320 of the opening 322a to light guide plate 302a of reflector 310a is fixed, and wherein reflector 310a preferably contacts with the incidence surface 320 of light guide plate 302a.The circuit board 308 of LED light-source module 304 is installed with in the C type structure 312 of reflector 310a, and the exiting surface 318 of each light emitting diode 306 is preferably between this two extension 314a.Wherein, standoff distance 327 between the exiting surface 318 of light emitting diode 306 and the incidence surface 320 of light guide plate 302a.By reflection and the guiding of the extension 314a of reflector 310a, light emitting diode 306 can be imported the incidence surface 320 in opening 322a front via the light 328 that exiting surface 318 sends and enter in light guide plate 302a.
In this exemplary embodiment, the height 324a of the opening 322a of reflector 310a is less than the thickness 326 of light guide plate 302a, as shown in Figure 2 A.In an embodiment, when the thickness 326 of light guide plate 302a is about 4mm, the height 324a of the opening 322a of reflector 310a preferably can between about 3.0mm to about between 3.8mm.Therefore, the height 324a of the opening 322a of reflector 310a preferably can between essence 3/4 to the essence 19/20 of the thickness 326 of light guide plate 302a.By the height 324a of the opening 322a of reduction reflector 310a, the both up and down reducing light emitting diode 306 to reflecting surface between spacing, thus, can limit light emitting diode 306 both up and down to rising angle, the Angle ambiguity when light 328 that light emitting diode 306 can be made thus to send enters light guide plate 302a is at proper range, and the bright intensity of the light guide plate 302a being positioned at light emitting diode 306 dead ahead can be reduced, and then effectively can solve the bright spot ripple of backlight module 300a.The height 324a of the opening 322a of reflector 310a is less, the situation of the bright spot ripple of backlight module 300a is slighter, and the distance 327 between the exiting surface 318 of light emitting diode 306 and the incidence surface 320 of light guide plate 302a can be shorter, but the bright line situation of light guide plate 302a can be more obvious.In the exemplary embodiments, the ratio between the height 324a of the distance 327 between the exiting surface 318 of light emitting diode 306 and the incidence surface 320 of light guide plate 302a and the opening 322a of reflector 310a is preferably greater than or equal to 30%.
The reflector of backlight module of the present invention can have other different designs.Please refer to Fig. 2 B, it illustrates the partial cutaway schematic view of a kind of backlight module according to the second preferred embodiment of the present invention.In this exemplary embodiment, the apparatus design of backlight module 300b is identical with the backlight module 300a of the first embodiment haply, and difference therebetween is only that the reflector 310b of backlight module 300b is different from the structural design of the reflector 310a of backlight module 300a.In backlight module 300b, reflector 310b mainly comprises C type structure 312 and two extension 314b, and wherein this two extension 314b is bonded on the two ends 316 of the perforate 348 of C type structure 312 equally respectively, and each extension 314b is dull and stereotyped.In this exemplary embodiment, this two extension 314b respectively from the two ends 316 of the perforate 348 of C type structure 312 towards the direction of the incidence surface 320 of light guide plate 302a toward between the two ends 316 that the mode of outer incline is arranged on the perforate 348 of C type structure 312 and the incidence surface 320 of light guide plate 302a, and opening 322b is formed before the incidence surface 320 of light guide plate 302a, therefore LED light-source module 304 can via the opening 322b of reflector 310b towards incidence surface 320 incident light of light guide plate 302a.The distance of the incidence surface 320 of the opening 322b to light guide plate 302a of reflector 310b is fixed, and wherein reflector 310b preferably contacts with the incidence surface 320 of light guide plate 302a.In another kind of embodiment, two extensions of reflector can also between the two ends 316 that are arranged on the perforate of C type structure towards the direction of the incidence surface 320 of light guide plate 302a toward tilted mode, the two ends of the perforate of the C type structure of self-reflection cover respectively and the incidence surface 320 of light guide plate 302a.Similarly, the circuit board 308 of LED light-source module 304 is installed with in the C type structure 312 of reflector 310b, and the exiting surface 318 of each light emitting diode 306 is preferably between this two extension 314b.
In this exemplary embodiment, the height 324b of the opening 322b of reflector 310b is less than the thickness 326 of light guide plate 302a, as shown in Figure 2 B.In an embodiment, the height 324b of the opening 322b of reflector 310b preferably can between essence 3/4 to the essence 19/20 of the thickness 326 of light guide plate 302a.In the exemplary embodiments, the ratio between the height 324b of the distance 327 between the exiting surface 318 of light emitting diode 306 and the incidence surface 320 of light guide plate 302a and the opening 322b of reflector 310b is preferably greater than or equal to 30%.
Please refer to Fig. 2 C, it illustrates the partial cutaway schematic view of a kind of backlight module according to the 3rd preferred embodiment of the present invention.In this exemplary embodiment, the apparatus design of backlight module 300c is identical with the backlight module 300a of the first embodiment haply, and difference is therebetween that the reflector 310c of backlight module 300c is different from the structural design of the reflector 310a of backlight module 300a equally.In backlight module 300c, reflector 310c mainly comprises C type structure 312 and two extension 314c, and wherein this two extension 314c is bonded on the two ends 316 of the perforate 348 of C type structure 312 equally respectively, but each extension 314c non-tablet and be camber plate.In this exemplary embodiment, between this two extension 314b is arranged on the perforate 348 of C type structure 312 respectively two ends 316 from the two ends 316 of the perforate 348 of C type structure 312 and the incidence surface 320 of light guide plate 302a, and opening 322c is formed before the incidence surface 320 of light guide plate 302a, therefore LED light-source module 304 can via the opening 322c of reflector 310c towards incidence surface 320 incident light of light guide plate 302a.The distance of the incidence surface 320 of the opening 322c to light guide plate 302a of reflector 310c is fixed, and wherein reflector 310c preferably contacts with the incidence surface 320 of light guide plate 302a.Similarly, the circuit board 308 of LED light-source module 304 is installed with in the C type structure 312 of reflector 310c, and the exiting surface 318 of each light emitting diode 306 is preferably between this two extension 314c.
In this exemplary embodiment, the height 324c of the opening 322c of reflector 310c is less than the thickness 326 of light guide plate 302a, as shown in Figure 2 C.In an embodiment, the height 324c of the opening 322c of reflector 310c preferably can between essence 3/4 to the essence 19/20 of the thickness 326 of light guide plate 302a.In the exemplary embodiments, the ratio between the height 324c of the distance 327 between the exiting surface 318 of light emitting diode 306 and the incidence surface 320 of light guide plate 302a and the opening 322c of reflector 310c is preferably greater than or equal to 30%.
Please refer to Fig. 2 D, it illustrates the partial cutaway schematic view of a kind of backlight module according to the 4th preferred embodiment of the present invention.In this exemplary embodiment, the apparatus design of backlight module 300d is identical with the backlight module 300d of the first embodiment haply, and difference is therebetween that the structural design of light guide plate 302b and 302a is different.In backlight module 300d, light guide plate 302b is made up of the lead angle district 330 engaged each other and non-lead angle district 332, wherein lead angle district 330 is adjacent to LED light-source module 304 and reflector 310a, and the incidence surface 320 of light guide plate 302b is positioned on the side adjacent with opening 322a, lead angle district 330.In this exemplary embodiment, non-lead angle district 332 can be slab construction or wedge-shaped board structure.Therefore, the thickness 326 of light guide plate 302b is for being positioned at the thickness at place of non-lead angle district 332.
In this exemplary embodiment, the height 324a of the opening 322a of reflector 310a is less than or equal to the height 334 being adjacent to the incidence surface 320 of the opening 322a of reflector 310a in the lead angle district 330 of light guide plate 302b, as shown in Figure 2 D.In an embodiment, the height 324a of the opening 322a of reflector 310a is less than the thickness 326 of light guide plate 302b.In a preferred embodiment, the height 324a of the opening 322a of reflector 310a is preferably between essence 3/4 to the essence 19/20 of the thickness 326 of light guide plate 302b.The distance of the incidence surface 320 of the opening 322a to light guide plate 302b of reflector 310a is fixed, and wherein reflector 310a preferably contacts with the incidence surface 320 in lead angle district 330.
Although in the backlight module 300d of the 4th above-mentioned embodiment, that arrange in pairs or groups with light guide plate 302b is the reflector 310a of the first embodiment, such as, but the reflector adopted in other above-mentioned embodiments, reflector 310b and change type thereof and reflector 310c all can replace the reflector 310a adopted in backlight module 300d.
Fig. 3 A and Fig. 4 H represents figure for the result that to be light source with three LEDs carry out simulating.Please also refer to Fig. 3 A, its distance 327 illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness 326 of light guide plate is 4mm, and when the opening 324a of reflector is 4mm, the brightness distribution curve figure obtained.The figure 350 of Fig. 3 A is the intensity map of light guide plate exiting surface 336, wherein the top edge of figure 350 is incidence surface 320, the intensity profile of figure 352 for obtaining along the transverse axis BB ' of figure 350, the intensity profile of figure 354 then for obtaining along the longitudinal axis AA ' of figure 350.In figure 3 a, when the thickness of light guide plate is 4mm and the height of the opening of reflector is 4mm, can be found out by figure 352, the horizontal Luminance Distribution of light guide plate still has obvious fluctuating, and therefore bright spot is obvious in this condition.In addition, after can finding out light guide plate inner distance incidence surface distance to a certain degree by longitudinal Luminance Distribution of figure 354, brightness just can be evenly distributed, and the scope of the non-visible area of display light guide plate is larger.
Please refer to Fig. 3 B, its distance 327 illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness 326 of light guide plate is 4mm, and when the opening 324a of reflector is 3.8mm, the brightness distribution curve figure obtained.In figure 3b, when the thickness of light guide plate is 4mm and the reduced height of the opening of reflector is 3.8mm, can be found out by figure 358, the fluctuating of the horizontal Luminance Distribution of light guide plate has become mild, therefore in this condition, the bright spot phenomenon of non-visible area has obtained effective improvement.In addition, can be found out the reduction of the opening along with reflector by longitudinal Luminance Distribution of figure 360, the scope of the non-visible area of light guide plate diminishes.
Please refer to Fig. 3 C, its distance 327 illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness 326 of light guide plate is 4mm, and when the opening 324a of reflector is 3.6mm, the brightness distribution curve figure obtained.In fig. 3 c, when the thickness of light guide plate is 4mm and the reduced height of the opening of reflector is 3.6mm, can be found out by figure 364, slow conjunction when the fluctuating of the horizontal Luminance Distribution of light guide plate is 3.8mm compared with the open height of reflector, but in this condition, in light guide plate, can bright line be formed close to incidence surface part.In addition, the non-visible area scope when scope can being found out the non-visible area of light guide plate by longitudinal Luminance Distribution of figure 366 is slightly 3.8mm compared with the open height of reflector is little.
Please refer to Fig. 3 D, its distance 327 illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness 326 of light guide plate is 4mm, and when the opening 324a of reflector is 3mm, the brightness distribution curve figure obtained.In fig. 3d, when the thickness of light guide plate is 4mm and the reduced height of the opening of reflector is 3mm, can be found out by figure 370, mild when the fluctuating of the horizontal Luminance Distribution of light guide plate is 3.6mm compared with the open height of reflector.In addition, the non-visible area scope when scope can being found out the non-visible area of light guide plate by longitudinal Luminance Distribution of figure 372 is slightly 3.6mm compared with the open height of reflector is little.But now the non-visible area of light guide plate has comparatively significantly bright line phenomenon.
Please refer to Fig. 3 E, its distance 327 illustrated between the exiting surface and the incidence surface of light guide plate of light emitting diode is 1mm, and the thickness 326 of light guide plate is 4mm, and when the opening 324a of reflector is 2.4mm, the brightness distribution curve figure obtained.In fig. 3e, when the thickness of light guide plate is 4mm and the reduced height of the opening of reflector is 2.4mm, can be found out by figure 376, mild when the fluctuating of the horizontal Luminance Distribution of light guide plate is 3mm compared with the open height of reflector.In addition, the non-visible area scope when scope can being found out the non-visible area of light guide plate by longitudinal Luminance Distribution of figure 378 is slightly 3mm compared with the open height of reflector is little.But now the bright line of the non-visible area of light guide plate is then more obvious.
Please refer to Fig. 4 A, its thickness 326 illustrated when light guide plate is 4mm, and the opening 324a of reflector is 3.6mm, and when the distance 327 between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, the brightness distribution curve figure obtained.The figure 380 of Fig. 4 A is the intensity map of light guide plate exiting surface 336, wherein the top edge of figure 380 is incidence surface 320, the intensity profile of figure 381 for obtaining along the transverse axis BB ' of figure 380, the intensity profile of figure 382 then for obtaining along the longitudinal axis AA ' of figure 380.Distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, and the height of the opening of reflector is 3.6mm, and thus the ratio of distance to opening is now about 27.8%.In Figure 4 A, can be found out by figure 381, the fluctuating of the horizontal Luminance Distribution of light guide plate is comparatively mild, and therefore the bright spot phenomenon of non-visible area obtains some improvement.And the reduction of the opening along with reflector can be found out by longitudinal Luminance Distribution of figure 382, the scope of the non-visible area of light guide plate diminishes.
Please refer to Fig. 4 B, its thickness 326 illustrated when light guide plate is 4mm, and the opening 324a of reflector is 3.6mm, and when the distance 327 between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.5mm, the brightness distribution curve figure obtained.Wherein, figure 385 is longitudinal Luminance Distribution of light guide plate exiting surface 336.Distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.5mm, and the height of the opening of reflector is 3.6mm, and thus the ratio of distance to opening is now increased to about 41.67%.In figure 4b, can be found out by figure 384, the fluctuating of the horizontal Luminance Distribution of light guide plate is mild when comparatively distance is 1mm, and therefore the bright spot phenomenon of non-visible area obtains and improves further.
Please refer to Fig. 4 C, its thickness 326 illustrated when light guide plate is 4mm, and the opening 324a of reflector is 3.6mm, and when the distance 327 between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.08mm, the brightness distribution curve figure obtained.Wherein, figure 388 is longitudinal Luminance Distribution of light guide plate exiting surface 336.Distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.08mm, and the height of the opening of reflector is 3.6mm, and thus the ratio of distance to opening is now increased to about 30%.In figure 4 c, can be found out by figure 387, when the fluctuating of the horizontal Luminance Distribution of light guide plate be 1mm compared with distance mild but rise and fall comparatively distance for large during 1.5mm, therefore the bright spot phenomenon of non-visible area comparatively distance for improvement during 1mm but compared with apart from obvious when being 1.5mm.
Please refer to Fig. 4 D, its thickness 326 illustrated when light guide plate is 4mm, and the opening 324a of reflector is 3mm, and when the distance 327 between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, the brightness distribution curve figure obtained.Wherein, figure 391 is longitudinal Luminance Distribution of light guide plate exiting surface 336.Distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, and the height down of the opening of reflector is 3mm, and thus the ratio of distance to opening is now increased to about 33.33%.In fig. 4d, can be found out by figure 390, the fluctuating of the horizontal Luminance Distribution of light guide plate comparatively distance be all 1mm but reflector open height is 3.6mm time mild, therefore the bright spot phenomenon of non-visible area is improved when comparatively reflector open height is 3.6mm.
Please refer to Fig. 4 E, its thickness 326 illustrated when light guide plate is 4mm, and the opening 324a of reflector is 3mm, and when the distance 327 between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.5mm, the brightness distribution curve figure obtained.Wherein, figure 394 is longitudinal Luminance Distribution of light guide plate exiting surface 336.Distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is increased to 1.5mm, and the height of the opening of reflector maintains 3mm, and thus the ratio of distance to opening is now increased to 50%.In Fig. 4 E, can be found out by figure 393, the fluctuating of the horizontal Luminance Distribution of light guide plate is mild when comparatively distance is 1mm, and therefore the bright spot phenomenon of non-visible area is comparatively apart from improving for during 1mm.
Please refer to Fig. 4 F, its thickness 326 illustrated when light guide plate is 4mm, and the opening 324a of reflector is 2.4mm, and when the distance 327 between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, the brightness distribution curve figure obtained.Distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1mm, and the height of the opening of reflector is reduced to 2.4mm further, and thus the ratio of distance to opening is now increased to about 41.67%.In Fig. 4 F, can be found out by figure 396, the fluctuating of the horizontal Luminance Distribution of light guide plate comparatively distance be all 1mm but reflector open height is 3mm time mild, therefore the bright spot phenomenon of non-visible area is improved when comparatively reflector open height is 3mm.And the brightness can being found out the non-visible area of light guide plate by longitudinal Luminance Distribution of figure 397 is large when being 3mm compared with reflector open height, therefore the phenomenon of bright line is comparatively obvious.
Please refer to Fig. 4 G, its thickness 326 illustrated when light guide plate is 4mm, and the opening 324a of reflector is 2.4mm, and when the distance 327 between the exiting surface of light emitting diode and the incidence surface of light guide plate is 1.5mm, the brightness distribution curve figure obtained.Wherein, figure 403 is longitudinal Luminance Distribution of light guide plate exiting surface 336.Distance between the exiting surface of light emitting diode and the incidence surface of light guide plate is increased to 1.5mm, and the height of the opening of reflector maintains 2.4mm, and thus the ratio of distance to opening is now increased to 62.5%.In Fig. 4 G, can be found out by figure 399, the fluctuating of the horizontal Luminance Distribution of light guide plate is mild when obviously comparatively distance is 1mm, and therefore the bright spot phenomenon of non-visible area is improved for during 1mm compared with distance.
Please refer to Fig. 4 H, its thickness 326 illustrated when light guide plate is 4mm, and the opening 324a of reflector is 1.8mm, and when the distance 327 between the exiting surface of light emitting diode and the incidence surface of light guide plate is 0.9mm, the brightness distribution curve figure obtained.The figure 404 of Fig. 4 H is the intensity map on light guide plate, the intensity profile of figure 405 for obtaining along the transverse axis BB ' of figure 404, the intensity profile of figure 406 then for obtaining along the longitudinal axis AA ' of figure 404.Distance Shortened between the exiting surface of light emitting diode and the incidence surface of light guide plate is 0.9mm, and the height of the opening of reflector is further reduced to 1.8mm, and thus the ratio of distance to opening is now increased to about 50%.In Fig. 4 H, can be found out by figure 405, be subject to the impact of Distance Shortened, the big rise and fall of the horizontal Luminance Distribution of light guide plate.And can be found out by longitudinal Luminance Distribution of figure 406, although Distance Shortened, due to the openings get smaller of reflector, therefore the scope of the non-visible area of light guide plate is little.
From Fig. 4 A to Fig. 4 H, the opening of reflector is less, and bright spot phenomenon is slighter, and the distance between the exiting surface of light emitting diode and the incidence surface of light guide plate can be shorter.But the opening of reflector is less, the bright line of the non-visible area of light guide plate is more obvious.
Above-mentioned backlight module all can be applicable in liquid crystal display, and below lifting backlight module 300a is example.Please refer to Fig. 5, it illustrates the partial cutaway schematic view of a kind of liquid crystal display according to the preferred embodiment of the present invention.In the exemplary embodiments, liquid crystal display 400 mainly comprises display panels 402 and backlight module 300a, and wherein backlight module 300a is arranged on the back side of display panels 402, to provide display panels 402 backlight.In an embodiment, backlight module 300a more can add back of the body frame 338 and front frame 344 according to product demand, to support and to fix the structure of backlight module 300a.Light guide plate 302a, LED light-source module 304 are all arranged on reflector 310a to be carried on the back on frame 338, wherein carry on the back frame 338 and be also optionally convexly equipped with fixing projection 340, this fixing projection 340 is blocked between the C type structure 312 of reflector 310a and the incidence surface 320 of light guide plate 302a, with fixation reflex cover 310a and the position arranging LED light-source module 304 in the inner, and the opening 322a of reflector 310a is made to remain on incidence surface 320 side of light guide plate 302a.Front frame 344 is located at the outer rim of light guide plate 302a and LED light-source module 304 with on reflector 310a, and the side of front frame 344 extends the lateral surface being located at reflector 310a and back of the body frame 338.Optionally, back of the body frame 338 has more snap fit 342, and the position correspondence that front frame 344 corresponds to the snap fit 342 of back of the body frame 338 is provided with fixing hole 346, and the snap fit 342 wherein carrying on the back frame 338 can be arranged in pairs or groups with the fixing hole 346 of front frame 344 mutually and be fastened togather.Display panels 402 can set up on former frame 344, and carried by front frame 344.
From above-mentioned example embodiment, advantage of the present invention be exactly because the backlight module of the present invention both up and down that can limit light emitting diode to rising angle, the light that control light emitting diode sends thus enters the angle of light guide plate, and light is more penetrated from the exiting surface of light guide plate after the central authorities of visible area advance again, therefore effectively can alleviate the bright spot ripple of the light inlet even eliminating light guide plate.
From above-mentioned example embodiment, another advantage of the present invention is exactly significantly improve because the bright spot phenomenon of backlight module of the present invention can obtain or eliminate, therefore the spacing of the light emitting diode of LED light-source module can be increased, and the usage quantity of light emitting diode can be reduced, and the edge frontal region of backlight module can be reduced.
From above-mentioned example embodiment, another advantage of the present invention is exactly because liquid crystal display of the present invention can under the dimensions taking into account display, effective reduction or essence eliminate the bright spot ripple of backlight module, therefore under original dimensions, the display quality of liquid crystal display can effectively be promoted.
Although the present invention discloses as above with preferred embodiment; so itself and be not used to limit the present invention; any those of ordinary skill in this technical field; without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, therefore protection scope of the present invention is as the criterion when defining depending on appended claim.
Claims (12)
1. a backlight module, at least comprises:
Light guide plate, has incidence surface;
LED light-source module, is located at by this incidence surface; And
Reflector, there is opening and be adjacent to this incidence surface, wherein this LED light-source module to be arranged in this reflector and via this opening towards this incidence surface incident light, the height of this opening is less than the thickness of this light guide plate, wherein, reflector at least comprises C type structure and two extensions, wherein C type structure has perforate, and this two extension is bonded on two ends of C type structure perforate respectively, each extension system one is dull and stereotyped, and this two courts of a feudal ruler extending portion is with substantial level and between the mode be parallel to each other two ends that are arranged on the perforate of C type structure and the incidence surface of light guide plate, and opening is formed before the incidence surface of light guide plate.
2. backlight module as claimed in claim 1, wherein this height of this opening is between essence 3/4 to the essence 19/20 of this thickness of this light guide plate.
3. backlight module as claimed in claim 1, wherein this light guide plate is wedge-shaped board structure.
4. backlight module as claimed in claim 1, wherein this light guide plate at least comprises:
Non-lead angle district; And
Lead angle district, wherein this incidence surface be located at this lead angle district side on and this lead angle district is adjacent to this LED source and this reflector.
5. a backlight module, at least comprises:
Light guide plate, has incidence surface;
LED light-source module, be located at by this incidence surface, wherein this LED light-source module at least comprises multiple light emitting diode, and described in each, light emitting diode has exiting surface, and has distance between this exiting surface and this incidence surface; And
Reflector, there is opening and be adjacent to this incidence surface, wherein this LED light-source module to be arranged in this reflector and via this opening towards this incidence surface incident light, this distance is more than or equal to 30% with the ratio of the height of this opening, wherein, reflector at least comprises C type structure and two extensions, wherein C type structure has perforate, and this two extension is bonded on two ends of C type structure perforate respectively, each extension system one is dull and stereotyped, and this two extension is with substantial level and between the mode be parallel to each other two ends that are arranged on the perforate of C type structure and the incidence surface of light guide plate, and opening is formed before the incidence surface of light guide plate, wherein the height of this opening is less than the thickness of this light guide plate.
6. backlight module as claimed in claim 5, wherein this height of this opening is between essence 3/4 to the essence 19/20 of this thickness of this light guide plate.
7. backlight module as claimed in claim 5, wherein this light guide plate is wedge-shaped board structure.
8. backlight module as claimed in claim 5, wherein this light guide plate at least comprises:
Non-lead angle district; And
Lead angle district, wherein this incidence surface be located at this lead angle district side on and this lead angle district is adjacent to this LED source and this reflector.
9. a liquid crystal display, at least comprises:
Display panels; And
Backlight module, is located at the back side of this display panels, and wherein this backlight module at least comprises:
Light guide plate, has incidence surface;
LED light-source module, is located at by this incidence surface; And
Reflector, there is opening and be adjacent to this incidence surface, wherein this LED light-source module to be arranged in this reflector and via this opening towards this incidence surface incident light, the height of this opening is less than the thickness of this light guide plate, wherein, reflector at least comprises C type structure and three extensions, wherein C type structure has perforate, and this two courts of a feudal ruler extending portion is bonded on two ends of C type structure perforate respectively, each extension system one is dull and stereotyped, and this two extension is with substantial level and between the mode be parallel to each other two ends that are arranged on the perforate of C type structure and the incidence surface of light guide plate, and opening is formed before the incidence surface of light guide plate.
10. liquid crystal display as claimed in claim 9, wherein this height of this opening is between essence 3/4 to the essence 19/20 of this thickness of this light guide plate.
11. 1 kinds of liquid crystal displays, at least comprise:
Display panels; And
Backlight module, is located at the back side of this display panels, and wherein this backlight module at least comprises:
Light guide plate, has incidence surface;
LED light-source module, be located at by this incidence surface, wherein this LED light-source module at least comprises multiple light emitting diode, and described in each, light emitting diode has exiting surface, and has distance between this exiting surface and this incidence surface; And
Reflector, there is opening and be adjacent to this incidence surface, wherein this LED light-source module to be arranged in this reflector and via this opening towards this incidence surface incident light, this distance is more than or equal to 30% with the ratio of the height of this opening, wherein, reflector at least comprises C type structure and two extensions, wherein C type structure has perforate, and this two extension is bonded on two ends of C type structure perforate respectively, each extension system one is dull and stereotyped, and this two extension is with substantial level and between the mode be parallel to each other two ends that are arranged on the perforate of C type structure and the incidence surface of light guide plate, and opening is formed before the incidence surface of light guide plate, wherein the height of this opening is less than the thickness of this light guide plate.
12. liquid crystal displays as claimed in claim 11, wherein this height of this opening is between essence 3/4 to the essence 19/20 of this thickness of this light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910253165.9A CN102086992B (en) | 2009-12-04 | 2009-12-04 | Backlight module and application thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910253165.9A CN102086992B (en) | 2009-12-04 | 2009-12-04 | Backlight module and application thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102086992A CN102086992A (en) | 2011-06-08 |
| CN102086992B true CN102086992B (en) | 2015-06-03 |
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| CN200910253165.9A Expired - Fee Related CN102086992B (en) | 2009-12-04 | 2009-12-04 | Backlight module and application thereof |
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| KR20130022060A (en) | 2011-08-24 | 2013-03-06 | 삼성디스플레이 주식회사 | Backlight assembly and method of manufacturing the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6419369B1 (en) * | 1999-10-26 | 2002-07-16 | Advanced Display Inc. | Sheet-like source light device and liquid crystal display device using the same |
| CN1580896A (en) * | 2003-08-06 | 2005-02-16 | 友达光电股份有限公司 | Sidelight back light module |
| CN101308286A (en) * | 2008-07-09 | 2008-11-19 | 友达光电股份有限公司 | Backlight module group and reflective cover manufacture method and mould for manufacturing thermoplastic reflective cover |
-
2009
- 2009-12-04 CN CN200910253165.9A patent/CN102086992B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6419369B1 (en) * | 1999-10-26 | 2002-07-16 | Advanced Display Inc. | Sheet-like source light device and liquid crystal display device using the same |
| CN1580896A (en) * | 2003-08-06 | 2005-02-16 | 友达光电股份有限公司 | Sidelight back light module |
| CN101308286A (en) * | 2008-07-09 | 2008-11-19 | 友达光电股份有限公司 | Backlight module group and reflective cover manufacture method and mould for manufacturing thermoplastic reflective cover |
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| CN102086992A (en) | 2011-06-08 |
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