CN101368687B - Side light type backlight module and its operation method - Google Patents
Side light type backlight module and its operation method Download PDFInfo
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- CN101368687B CN101368687B CN2008101701713A CN200810170171A CN101368687B CN 101368687 B CN101368687 B CN 101368687B CN 2008101701713 A CN2008101701713 A CN 2008101701713A CN 200810170171 A CN200810170171 A CN 200810170171A CN 101368687 B CN101368687 B CN 101368687B
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Abstract
Disclosed are a sidelight type backlight module and the operation method thereof; wherein, the sidelight type backlight module comprises a light guide plate and a plurality of LED light sources. The light guide plate includes a light input lateral side and a light output surface. The LED light sources are arranged on the light input lateral side; an interval is maintained between each two adjacent LED light sources; wherein, the LED light sources are arranged with unequal intervals. The sidelight type backlight module can prevent the uneven temperature problem, have no influence on the optical quality and prevent the warping phenomenon of the light guide plate.
Description
Technical field
The present invention relates to a kind of backlight module and method of operating thereof, relate in particular to a kind of side light type back light module and method of operating thereof.
Background technology
The operating principle of side light type back light module is via LGP the ray guidance in sidelight source to be become planar light source, guarantees the uniformity of brightness.The backlight that side light type back light module is commonly used for example has cold-cathode fluorescence lamp and light emitting diode etc.Though be main flow at present with the cold-cathode fluorescence lamp, yet the demand of light emitting diode increased with day.Compared to cold-cathode fluorescence lamp, light emitting diode has that volume is little, the life-span is long, driving voltage is low, power consumption is few and advantage such as vibration strength is good.
Generally speaking, in side light type back light module, utilize printed circuit board (PCB) collocation light emitting diode to be assembled into a plurality of LED sources usually.These LED sources adopt equally spaced arrangement mode, are configured in the side of LGP.
So, can cause the power density and the heat-sinking capability difference of diverse location, and cause temperature inequality or the too high problem of temperature, not only can influence optical quality, cause the LGP warping phenomenon, also cause the reliability problem of product and other elements easily.
In view of this, need a kind of new side light type back light module and method of operating thereof.
Summary of the invention
A technology type of the present invention provides a kind of side light type back light module, can prevent the problem of temperature inequality.
According to one embodiment of the invention, a kind of side light type back light module comprises LGP and a plurality of LED source.LGP comprises light incident sides.These LED sources are disposed on the light incident sides, and the spacing of being separated by between per two adjacent LED sources, and wherein these LED sources adopt unequal-interval to arrange.Whereby, can prevent the problem of temperature inequality, can not influence optical quality, and can prevent the LGP warping phenomenon.
According to another embodiment of the present invention, a kind of side light type back light module comprises LGP, a plurality of first LED source, a plurality of second LED source, a plurality of the 3rd LED source and a plurality of the 4th LED source.LGP comprises first light incident sides, second light incident sides, the 3rd light incident sides and the 4th light incident sides, relative second light incident sides of first light incident sides wherein, relative the 4th light incident sides of the 3rd light incident sides, first light incident sides connects the 3rd, the 4th light incident sides, and second light incident sides connects the 3rd, the 4th light incident sides.These first LED sources are disposed on first light incident sides, and first spacing of being separated by between per two adjacent first LED sources, in these first spacings, are positioned at first spacing for minimum of the middle position of first light incident sides.These second LED sources are disposed on second light incident sides, and second spacing of being separated by between per two adjacent second LED sources, in these second spacings, are positioned at second spacing for minimum of the middle position of second light incident sides.These the 3rd LED sources are disposed on the 3rd light incident sides, and the 3rd spacing of being separated by between per two adjacent the 3rd LED sources, in these the 3rd spacings, are positioned at the 3rd spacing for minimum of the middle position of the 3rd light incident sides.These the 4th LED sources are disposed on the 4th light incident sides, and the 4th spacing of being separated by between per two adjacent the 4th LED sources, in these the 4th spacings, are positioned at the 4th spacing for minimum of the middle position of the 4th light incident sides.Whereby, can prevent the problem of temperature inequality, can not influence optical quality, and can prevent the LGP warping phenomenon.
Another technology type of the present invention is that a kind of method of operating of side light type back light module is being provided, and can prevent the problem of temperature inequality.
According to one embodiment of the invention, a kind of method of operating is applicable to side light type back light module, side light type back light module comprises LGP and a plurality of LED source, LGP has light incident sides, wherein these LED sources are disposed on the light incident sides, this method of operating comprises: drive these LED sources, and inconsistent so as to the power that makes these LED sources.Whereby, can prevent the problem of temperature inequality, can not influence optical quality, and can prevent the LGP warping phenomenon.
According to another embodiment of the present invention, a kind of method of operating is applicable to side light type back light module, side light type back light module comprises LGP, a plurality of first LED sources, a plurality of second LED sources, a plurality of the 3rd LED sources and a plurality of the 4th LED source, wherein LGP comprises first light incident sides, second light incident sides, the 3rd light incident sides and the 4th light incident sides, relative second light incident sides of first light incident sides wherein, relative the 4th light incident sides of the 3rd light incident sides, first light incident sides connects the 3rd, the 4th light incident sides, second light incident sides connects the 3rd, the 4th light incident sides, these first LED sources, be disposed on first light incident sides, these second LED sources, be disposed on second light incident sides, these the 3rd LED sources, be disposed on the 3rd light incident sides, these the 4th LED sources, be disposed on the 4th light incident sides, this method of operating, comprise: drive these first, second, the 3rd, the 4th LED source is so as to making these first LED sources, second LED source, the power of these the 3rd LED sources and these the 4th LED sources is inconsistent.
Whereby, can prevent the problem of temperature inequality, can not influence optical quality, and can prevent the LGP warping phenomenon.
Below will detailed description be done in above-mentioned explanation and ensuing embodiment, and the present invention is further explained with various embodiment.
Description of drawings
Fig. 1 is the schematic diagram according to a kind of side light type back light module of one embodiment of the invention.
Fig. 2 is the schematic diagram according to a kind of side light type back light module of another embodiment of the present invention.
Fig. 3 is the schematic diagram according to a kind of side light type back light module of another embodiment of the present invention.
Fig. 4 is a kind of schematic diagram that is applicable to the method for operating of side light type back light module according to one embodiment of the invention.
Fig. 5 is a kind of schematic diagram that is applicable to the method for operating of side light type back light module according to another embodiment of the present invention.
Wherein, description of reference numerals is as follows:
100: side light type back light module
110: LGP
112: light incident sides
120: LED source
121-124: LED source
161-163: spacing
200: side light type back light module
210: LGP
211: the first light incident sides
212: the second light incident sides
213: the three light incident sides
214: the four light incident sides
221: the first LED sources
222: the second LED sources
223: the three LED sources
224: the four LED sources
261-263: spacing
300: side light type back light module
311-342: spacing
400: side light type back light module
500: side light type back light module
511-514: the first LED source
521-524: the second LED source
The 531-533: the 3rd LED source
The 541-543: the 4th LED source
The specific embodiment
In order to make narration of the present invention more detailed and complete, can be with reference to appended accompanying drawing and the various embodiment of the following stated, identical number is represented same or analogous element in the accompanying drawing.On the other hand, well-known element and step are not described among the embodiment, with the restriction of avoiding causing the present invention unnecessary.
An embodiment of the present invention is a kind of side light type back light module.This side light type back light module can be used on the display widely, or is used in other similar sport technique segments.The Fig. 1 that below will arrange in pairs or groups specifies the embodiment of this side light type back light module to Fig. 3.
Generally speaking, the side light type back light module of one-sided light inlet, a plurality of LED sources on the light incident sides of its LGP adopt the spacing tool to arrange.Yet this can cause the temperature inequality on the sidelight face of going into of LGP.
In view of this, please refer to Fig. 1, Fig. 1 is the schematic diagram according to a kind of side light type back light module of one embodiment of the invention.As shown in the figure, side light type back light module 100 comprises LGP 110 and a plurality of LED source 120.In the present embodiment, LGP 110 comprises LGP and comprises light incident sides 112.A plurality of LED sources 120 are disposed on the light incident sides 112, the intersegmental distance 161-163 of being separated by between per two adjacent LED sources 120.What be worth living meaning is that these LED sources 120 adopt unequal-interval to arrange.
According to above embodiment, the LED source 120 that unequal-interval is arranged can prevent the temperature inequality on the sidelight face 112 of going into of LGP 110 effectively.
Please continue with reference to Fig. 1, as shown in the figure, be positioned at the spacing 161 for maximum of the middle position of light incident sides in these spacings.Whereby, can prevent effectively that the middle position temperature of going into sidelight face 112 of LGP 110 is too high.
Please continue with reference to Fig. 1, as shown in the figure, be positioned at the spacing 163 for minimum of the lateral location of light incident sides in these spacings.Whereby, can prevent effectively that the temperature of the lateral location of going into sidelight face 112 of LGP 110 is lower than the temperature of middle position.
Please continue with reference to Fig. 1, as shown in the figure, these spacings 161-163 diminish to lateral location in regular turn along the middle position of light incident sides.In other words, spacing 161 is greater than spacing 162, and spacing 162 is greater than spacing 163.Whereby, the temperature of going into sidelight face 112 of LGP 110 is evenly distributed.
In addition, in Fig. 1, the power that each LED source 120 is exported can equate.Perhaps, the power that LED source 120 is exported is adjusted in visual practical application.
Please refer to Fig. 2, Fig. 2 is the schematic diagram according to a kind of side light type back light module of another embodiment of the present invention.As shown in the figure, side light type back light module 200 comprises LGP 110 and a plurality of LED source 120.In the present embodiment, LGP 110 comprises LGP and comprises a light incident sides 112.A plurality of LED sources 120 are disposed on the light incident sides 112, the intersegmental distance of being separated by between per two adjacent LED sources 120.It should be noted that a plurality of LED sources 120 adopt unequal-interval to arrange.
According to above embodiment, the LED source 120 that unequal-interval is arranged can prevent the temperature inequality on the sidelight face 112 of going into of LGP 110 effectively.
Please continue with reference to Fig. 2, as shown in the figure, be positioned at the spacing 261 for minimum of the middle position of light incident sides in these a plurality of spacings.Whereby, can prevent effectively that the temperature of the middle position of going into sidelight face 112 of LGP 110 is lower than the temperature of lateral location.
Please continue with reference to Fig. 2, as shown in the figure, be positioned at the spacing 263 for maximum of the lateral location of light incident sides in these spacings.Whereby, can prevent effectively that the lateral location temperature of going into sidelight face 112 of LGP 110 is too high.
Please continue with reference to Fig. 2, as shown in the figure, these spacings 261-263 become big along the middle position of light incident sides in regular turn to lateral location.In other words, spacing 263 is greater than spacing 262, and spacing 262 is greater than spacing 261.
In addition, in Fig. 2, the power that each LED source 120 is exported is unequal.Whereby, according to the arrangement mode of LED source among Fig. 2 120, the type of drive that the power of collocation output does not wait can prevent effectively that the temperature of going into sidelight face 112 of LGP 110 from evenly distributing.
Please refer to Fig. 3, Fig. 3 is the schematic diagram according to a kind of side light type back light module of another embodiment of the present invention.As shown in the figure, side light type back light module 300 comprises LGP 110, a plurality of first LED source 221, a plurality of second LED source 222, a plurality of the 3rd LED source 223 and a plurality of the 4th LED source 224.
In Fig. 3, LGP 210 comprises first light incident sides 211, second light incident sides 212, the 3rd light incident sides 213 and the 4th light incident sides 214.First light incident sides, 211 relative second light incident sides 212, the 3rd light incident sides 213 relative the 4th light incident sides 214, first light incident sides 211 connects the 3rd light incident sides 213 and the 4th light incident sides 214, the second light incident sides 212 connect the 3rd light incident sides 213 and the 4th light incident sides 214.
Please continue with reference to Fig. 3, as shown in the figure, a plurality of first LED sources 221 are disposed on first light incident sides 211, and first spacing 311-313 of being separated by between per two adjacent first LED sources 221.In these first spacings 311-313, be positioned at first light incident sides 211 middle position be the first minimum spacing 311.A plurality of second LED sources 222 are disposed on second light incident sides 212, and second spacing of being separated by between per two adjacent second LED sources 222.In these second spacings 321-323, be positioned at second spacing 321 for minimum of the middle position of second light incident sides 212.A plurality of the 3rd LED sources 223 are disposed on the 3rd light incident sides 213, and the 3rd spacing 331-333 of being separated by between per two adjacent the 3rd LED sources 223.In these the 3rd spacings 331-332, be positioned at the 3rd spacing 331 for minimum of the middle position of the 3rd light incident sides.A plurality of the 4th LED sources 224 are disposed on the 4th light incident sides 214, and the 4th spacing 341-343 of being separated by between per two adjacent the 4th LED sources 224.In these the 4th spacings 341-342, be positioned at the 4th spacing 341 for minimum of the middle position of the 4th light incident sides 214.Whereby, each that can prevent LGP 210 effectively temperature of going into the middle position of sidelight face 211-214 is lower than the temperature of lateral location.
Please continue with reference to Fig. 3, as shown in the figure, the first minimum spacing 311 equals the second minimum spacing 321, and the 3rd minimum spacing 331 equals the 4th minimum spacing 341.Whereby, make per two uniformity of temperature profile symmetries of going into the sidelight face relatively of LGP 110.
Please continue with reference to Fig. 3, as shown in the figure, in these first spacings 311-313, be positioned at first spacing 313 for maximum of the lateral location of first light incident sides 211.In these second spacings 321-323, be positioned at second spacing 323 for maximum of the lateral location of second light incident sides 212, in these the 3rd spacings 331-332, be positioned at the 3rd spacing 332 for maximum of the lateral location of the 3rd light incident sides 231.In these the 4th spacings 341-342, be positioned at the 4th spacing 342 for maximum of the lateral location of the 4th light incident sides 241.Whereby, it is too high that each that can prevent LGP 210 is effectively gone into the temperature of lateral location of sidelight face 211-214.
Please continue with reference to Fig. 3, as shown in the figure, the first maximum spacing 313 equals the second maximum spacing 323, and the 3rd maximum spacing 332 equals the 4th maximum spacing 342.Whereby, make per two uniformity of temperature profile symmetries of going into the sidelight face relatively of LGP 110.
Please continue with reference to Fig. 3, as shown in the figure, these first spacings 311-313 become big along the middle position of first light incident sides in regular turn to lateral location, these second spacings 321-323 become big along the middle position of second light incident sides in regular turn to lateral location, these the 3rd spacings 331-332 become greatly to lateral location in regular turn along the middle position of the 3rd light incident sides, and these the 4th spacings 341-342 become big along the middle position of the 4th light incident sides in regular turn to lateral location.Whereby, the temperature of going into sidelight face 112 of LGP 110 is evenly distributed.
In Fig. 3, the power that each first, second, third, fourth LED source 221-224 is exported equates.Perhaps, the power that LED source 221-224 is exported is adjusted in visual practical application.
Another embodiment of the present invention is a kind of method of operating of side light type back light module.This method of operating can be used on the display widely, or is used in other similar sport technique segments.Below will arrange in pairs or groups Fig. 4 and Fig. 5 specifies the embodiment of this method of operating.
Please refer to Fig. 4, Fig. 4 is a kind of schematic diagram that is applicable to the method for operating of side light type back light module according to one embodiment of the invention.As shown in the figure, side light type back light module 400 comprises LGP 110 and a plurality of LED source, and LGP 110 has light incident sides 112, and a plurality of LED sources 121-124 are disposed on the light incident sides 211.This method of operating comprises: drive these LED sources 121-124, and inconsistent so as to the power that makes these LED sources 121-124.Whereby, can prevent the temperature inequality on the sidelight face 112 of going into of LGP 110 effectively.
In order to make the narration that drives these LED sources 121-124 more detailed and complete, below will come the embodiment of the brightness disproportionation of these LED sources 121-124 of explicit order specifically with first embodiment and second embodiment.
Among first embodiment, mode with the simulation modulation produces a plurality of adjustable currents, and these adjustable currents are input to above-mentioned a plurality of LED sources 121-124, the LED source 121 that wherein is positioned at the middle position of light incident sides 412 receives minimum adjustable current.Whereby, the middle position of going into sidelight face 112 that can prevent LGP 110 effectively causes temperature too high because of the power consumption concentrations.
In addition, the LED source 124 that is positioned at the lateral location of light incident sides receives maximum adjustable current.Whereby, can prevent effectively that the temperature of the lateral location of going into sidelight face 112 of LGP 110 is lower than the temperature of middle position.
In addition, the received a plurality of adjustable currents of these LED sources are that middle position along light incident sides 412 increases progressively in regular turn to lateral location.In other words, the received adjustable current of LED source 121 is less than the received adjustable current of LED source 122, the received adjustable current of LED source 122 is less than the received adjustable current of LED source 123, and the received adjustable current of LED source 123 is less than the received adjustable current of LED source 124.Whereby, can make the sidelight face 112 of going into of LGP 110 reach balance effectively, and make light incident sides 112 temperature evenly distribute because of power consumption and heat-sinking capability.
Among second embodiment, mode with pulse wave width modulation produces a plurality of pulse wave electric currents, and these pulse wave electric currents are input to above-mentioned a plurality of LED sources 121-124, the peak value of these pulse wave electric currents equates, wherein each pulse wave electric current has the work period, is positioned at the pulse wave electric current that the LED source 121 of the middle position of light incident sides 112 received and has the minimum work period.Whereby, can prevent effectively that the middle position temperature of going into sidelight face 112 of LGP 110 is too high.
In addition, be positioned at the pulse wave electric current that the LED source 124 of the lateral location of light incident sides 112 received and have the maximum work period.Whereby, can prevent effectively that the temperature of the lateral location of going into sidelight face 112 of LGP 110 is lower than the temperature of middle position.
In addition, the work period of the received a plurality of pulse wave electric currents of these LED sources 121-124 is that middle position along light incident sides 412 increases progressively in regular turn to lateral location.In other words, the work period of the received pulse wave electric current of LED source 121 is less than the work period of the received pulse wave electric current of LED source 122; The work period of the pulse wave electric current that LED source 122 is received is less than the work period of the received pulse wave electric current of LED source 123; The work period of the pulse wave electric current that LED source 123 is received is less than the work period of the received pulse wave electric current of LED source 124.Whereby, the temperature of the light incident sides 112 of LGP 110 is evenly distributed.
It should be noted that above-mentioned a plurality of LED sources 121-124 can adopt equidistant arrangement.Perhaps, these LED sources 121-124 can adopt the arrangement mode as Fig. 1 or Fig. 2.Those of ordinary skills when looking practical application, select the arrangement mode that is fit to.
Please refer to Fig. 5, Fig. 5 is a kind of schematic diagram that is applicable to the method for operating of side light type back light module according to another embodiment of the present invention.As shown in the figure, side light type back light module 500 comprises LGP 210, a plurality of first LED source 511-514, a plurality of second LED source 521-524, a plurality of the 3rd LED source 531-533 and a plurality of the 4th LED source 541-543.In Fig. 5, LGP 210 comprises first light incident sides 211, second light incident sides 212, the 3rd light incident sides 213 and the 4th light incident sides 214.First light incident sides, 211 relative second light incident sides 212, the 3rd light incident sides 213 relative the 4th light incident sides 214, first light incident sides 211 connects the 3rd light incident sides 213 and the 4th light incident sides 214, the second light incident sides 212 connect the 3rd light incident sides 213 and the 4th light incident sides 214.These first LED sources 511-514 are disposed on first light incident sides 211, these a few second LED sources 521-524 are disposed on second light incident sides 212, these the 3rd LED sources 531-533 are disposed on the 3rd light incident sides 213, and these the 4th LED sources 541-543 are disposed on the 4th light incident sides 214.This method of operating comprises:
Drive these first LED sources 511-514, second LED source 521-524, the 3rd LED source 531-533, the 4th LED source 541-543, so as to making the operand power inequality of these first LED sources 511-514, second LED source 521-524, these the 3rd LED sources 531-533 and these the 4th LED sources 511-514.
In order to make the narration that drives these first LED sources 511-514, second LED source 521-524, the 3rd LED source 531-533, the 4th LED source 541-543 more detailed and complete, below will come the embodiment of the brightness disproportionation of these first LED sources 511-514 of explicit order, second LED source 521-524, these the 3rd LED sources 531-533 and these the 4th LED sources 541-543 specifically with the 3rd embodiment and the 4th embodiment.
Among the 3rd embodiment, mode with the simulation modulation produces a plurality of first adjustable currents, and these first adjustable currents are input to these first LED sources 511-514, first LED source 511 that wherein is positioned at the middle position of first light incident sides 211 receives the first minimum adjustable current.Mode with the simulation modulation produces a plurality of second adjustable currents, and these second adjustable currents are input to these second LED sources 521-524, second LED source 521 that wherein is positioned at the middle position of second light incident sides 212 receives the second minimum adjustable current.Mode with the simulation modulation produces a plurality of the 3rd adjustable currents, and these the 3rd adjustable currents are input to these the 3rd LED sources 531-533, the 3rd LED source 531 that wherein is positioned at the middle position of the 3rd light incident sides 213 receives the 3rd minimum adjustable current.Mode with the simulation modulation produces a plurality of the 4th adjustable currents, and these the 4th adjustable currents are input to these the 4th LED sources 541-543, the 4th LED source 541 that wherein is positioned at the middle position of the 4th light incident sides 214 receives the 4th minimum adjustable current.Whereby, can prevent effectively that the middle position temperature of going into sidelight face 211-214 of LGP 210 is too high.
In addition, first LED source 514 that is positioned at the lateral location of first light incident sides 211 receives maximum adjustable current.Second LED source 524 that is positioned at the lateral location of second light incident sides 212 receives maximum adjustable current.The 3rd LED source 533 that is positioned at the lateral location of the 3rd light incident sides 213 receives maximum adjustable current.The 4th LED source 543 that is positioned at the lateral location of the 4th light incident sides 214 receives maximum adjustable current.Whereby, can prevent effectively that the temperature of lateral location of the light incident sides 211-214 of LGP 210 is lower than the temperature of middle position.
In addition, these first LED source, 511-514 these received first adjustable currents are that middle position along first light incident sides 211 increases progressively in regular turn to lateral location.These second LED source, 521-524 these received second adjustable currents are that the middle position along second light incident sides 212 increases progressively in regular turn to lateral location.These the 3rd LED source 531-533 these received the 3rd adjustable currents are that the middle position along the 3rd light incident sides 213 increases progressively in regular turn to lateral location.These the 4th LED source 541-543 these received the 4th adjustable currents are that the middle position along the 4th light incident sides 214 increases progressively in regular turn to lateral location.Whereby, the temperature of the light incident sides 211-214 of LGP 210 is evenly distributed.
Among the 4th embodiment, mode with pulse wave width modulation produces a plurality of first pulse wave electric currents, and these first pulse wave electric currents are input to these first LED sources 511-514, the peak value of these first pulse wave electric currents equates, wherein each first pulse wave electric current had for first work period, was positioned at the first pulse wave electric current that first LED source 511 of the middle position of first light incident sides 211 received and had the first minimum work period.Mode with pulse wave width modulation produces a plurality of second pulse wave electric currents, and these second pulse wave electric currents are input to these second LED sources 521-524, the peak value of these second pulse wave electric currents equates, wherein each second pulse wave electric current had for second work period, was positioned at the second pulse wave electric current that second LED source 521 of the middle position of second light incident sides 522 received and had the second minimum work period.Mode with pulse wave width modulation produces a plurality of the 3rd pulse wave electric currents, and these the 3rd pulse wave electric currents are input to these the 3rd LED sources 531-533, the peak value of these the 3rd pulse wave electric currents equates, wherein each the 3rd pulse wave electric current had for one the 3rd work period, was positioned at the 3rd pulse wave electric current that the 3rd LED source 531 of the middle position of the 3rd light incident sides 213 received and had the 3rd minimum work period.Mode with pulse wave width modulation produces a plurality of the 4th pulse wave electric currents, and these the 4th pulse wave electric currents are input to these the 4th LED sources 541-543, the peak value of these the 4th pulse wave electric currents equates, wherein each the 4th pulse wave electric current had for one the 4th work period, was positioned at the 4th pulse wave electric current that the 4th LED source 541 of the middle position of the 4th light incident sides 214 received and had the 4th minimum work period.Whereby, can prevent effectively that the middle position temperature of going into sidelight face 211-214 of LGP 210 is too high.
In addition, be positioned at the first pulse wave electric current that first LED source 514 of the lateral location of first light incident sides 211 received and have the first maximum work period.Be positioned at the second pulse wave electric current that second LED source 524 of the lateral location of second light incident sides 212 received and have the second maximum work period.Be positioned at the 3rd pulse wave electric current that the 3rd LED source 533 of the lateral location of the 3rd light incident sides 213 received and have the 3rd maximum work period.Be positioned at the 4th pulse wave electric current that the 4th LED source 543 of the lateral location of the 4th light incident sides 214 received and have the 4th maximum work period.Whereby, can prevent effectively that the temperature of the lateral location of going into sidelight face 211-214 of LGP 210 is lower than the temperature of middle position.
In addition, these first work periods of received these the first pulse wave electric currents of these first LED sources 511-514 are that middle position along first light incident sides 211 increases progressively in regular turn to lateral location.These second work periods of these second pulse wave electric currents that these second LED sources 521-524 are received are that the middle position along second light incident sides 212 increases progressively in regular turn to lateral location.These the 3rd work periods of these the 3rd pulse wave electric currents that these the 3rd LED sources 531-533 are received are that the middle position along the 3rd light incident sides increases progressively in regular turn to lateral location.These the 4th work periods of these the 4th pulse wave electric currents that these the 4th LED sources 541-543 are received are that the middle position along the 4th light incident sides increases progressively in regular turn to lateral location.Whereby, the temperature of going into sidelight face 211-214 of LGP 210 is evenly distributed.
It should be noted that above-mentioned a plurality of LED sources 511-543 can adopt equidistant arrangement.Perhaps, these LED sources 511-543 can adopt the arrangement mode as Fig. 3.Those of ordinary skills when looking practical application, select the arrangement mode that is fit to.
Though the present invention discloses as above with embodiment; right its is not in order to limit the present invention; any those of ordinary skills; without departing from the spirit and scope of the present invention; when can doing various changes and modification, so protection scope of the present invention is as the criterion when looking appended the scope that claim defined.
Claims (6)
1. side light type back light module comprises:
One LGP, comprise one first light incident sides, one second light incident sides, one the 3rd light incident sides and one the 4th light incident sides, relative this second light incident sides of this first light incident sides wherein, the 3rd light incident sides is the 4th light incident sides relatively, this first light incident sides connects the 3rd, the 4th light incident sides, and this second light incident sides connects the 3rd, the 4th light incident sides;
A plurality of first LED sources, be disposed on this first light incident sides, and one first spacing of being separated by between per two adjacent first LED sources in described first spacing, is positioned at this first spacing for minimum of the middle position of this first light incident sides;
A plurality of second LED sources, be disposed on this second light incident sides, and one second spacing of being separated by between per two adjacent second LED sources in described second spacing, is positioned at this second spacing for minimum of the middle position of this second light incident sides;
A plurality of the 3rd LED sources, be disposed on the 3rd light incident sides, and one the 3rd spacing of being separated by between per two adjacent the 3rd LED sources in described the 3rd spacing, is positioned at the 3rd spacing for minimum of the middle position of the 3rd light incident sides; And
A plurality of the 4th LED sources, be disposed on the 4th light incident sides, and one the 4th spacing of being separated by between per two adjacent the 4th LED sources in described the 4th spacing, is positioned at the 4th spacing for minimum of the middle position of the 4th light incident sides.
2. side light type back light module as claimed in claim 1, wherein Zui Xiao this first spacing equals this minimum second spacing, and the 3rd minimum spacing equals the 4th minimum spacing.
3. side light type back light module as claimed in claim 1, be positioned at this first spacing of the lateral location of this first light incident sides in wherein said first spacing for maximum, be positioned at this second spacing of the lateral location of this second light incident sides in described second spacing for maximum, be positioned at the 3rd spacing for maximum of the lateral location of the 3rd light incident sides in described the 3rd spacing, be positioned at the 4th spacing for maximum of the lateral location of the 4th light incident sides in described the 4th spacing.
4. side light type back light module as claimed in claim 3, wherein Zui Da this first spacing equals this maximum second spacing, and the 3rd maximum spacing equals the 4th maximum spacing.
5. side light type back light module as claimed in claim 3, wherein said first spacing becomes big along the middle position of this first light incident sides in regular turn to lateral location, described second spacing becomes big along the middle position of this second light incident sides in regular turn to lateral location, described the 3rd spacing becomes greatly to lateral location in regular turn along the middle position of the 3rd light incident sides, and described the 4th spacing becomes big along the middle position of the 4th light incident sides in regular turn to lateral location.
6. side light type back light module as claimed in claim 1, wherein the power exported of each first, second, third, fourth LED source equates.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101701713A CN101368687B (en) | 2008-10-13 | 2008-10-13 | Side light type backlight module and its operation method |
| CN200910165754.1A CN101730338B (en) | 2008-10-13 | 2008-10-13 | The method of operation of side light type back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101701713A CN101368687B (en) | 2008-10-13 | 2008-10-13 | Side light type backlight module and its operation method |
Related Child Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI380096B (en) | 2009-05-08 | 2012-12-21 | Au Optronics Corp | Backlight unit |
| CN201555153U (en) * | 2009-12-01 | 2010-08-18 | 深圳帝光电子有限公司 | Uniform high-brightness side-light type backlight source |
| US8780297B2 (en) | 2010-08-20 | 2014-07-15 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight module |
| CN101936487B (en) * | 2010-08-20 | 2013-06-05 | 深圳市华星光电技术有限公司 | Backlight module |
| CN102011960B (en) * | 2010-09-29 | 2013-04-17 | 友达光电股份有限公司 | Side incident backlight module |
| TWI431604B (en) * | 2010-10-19 | 2014-03-21 | Innolux Corp | Method for controlling backlight and backlight module |
| CN102332528A (en) * | 2011-10-08 | 2012-01-25 | 滨州市甘德电子科技有限公司 | Equal-life heat dissipation method for arrayed LEDs (light-emitting diode) |
| CN104949009A (en) * | 2015-07-03 | 2015-09-30 | 深圳市华星光电技术有限公司 | LCD and backlight module thereof |
| CN107167869A (en) * | 2017-06-23 | 2017-09-15 | 青岛海信电器股份有限公司 | Backlight module and liquid crystal display device |
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| FR2875993B1 (en) * | 2004-09-28 | 2006-12-08 | Thales Sa | ELECTROLUMINESCENT DIODE LIGHT BOX |
| US7317288B2 (en) * | 2005-09-02 | 2008-01-08 | Au Optronics Corporation | Controlling method and system for LED-based backlighting source |
| KR20070058087A (en) * | 2005-12-01 | 2007-06-07 | 삼성전자주식회사 | Backilight unit, driving method of the same and liquid crystal display device having the same |
| US8018424B2 (en) * | 2006-10-19 | 2011-09-13 | Au Optronics Corporation | Backlight device with zone control |
| CN100543555C (en) * | 2006-12-29 | 2009-09-23 | 晶宏半导体股份有限公司 | Side illuminating source backlight module |
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| CN101730338B (en) | 2015-11-25 |
| CN101730338A (en) | 2010-06-09 |
| CN101368687A (en) | 2009-02-18 |
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