CN1545372A - Backlight module - Google Patents
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- CN1545372A CN1545372A CNA2003101199495A CN200310119949A CN1545372A CN 1545372 A CN1545372 A CN 1545372A CN A2003101199495 A CNA2003101199495 A CN A2003101199495A CN 200310119949 A CN200310119949 A CN 200310119949A CN 1545372 A CN1545372 A CN 1545372A
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Abstract
The invention relates to a backlight module which comprises a circuit board, a light emitting diode array and a driving circuit. The light emitting diode array is arranged on the circuit board and provided with 3N rows of light source groups, the 1 st row of light source group and the 3 Nth row of light source group are respectively adjacent to two sides of the circuit board, and each row of light source group is provided with a plurality of light emitting diodes. The driving circuit is used for providing current to the light emitting diode array, so that the brightness of each light emitting diode of the 3 Nth row of light source group is smaller than that of each light emitting diode of the 3 rd row of light source group, and the brightness of each light emitting diode of the 1 st row of light source group is smaller than that of each light emitting diode of the 3N-2 th row of light source group.
Description
Technical field
The invention relates to a kind of backlight module, and particularly (lightemitting diode, LED) array is the backlight module of light source with light-emitting diode relevant for a kind of.
Background technology
Along with LCD (liquid crystal display, LCD) manufacturing technology is progressive fast, with and possess and frivolous, power saving arranged and do not have advantages such as width of cloth ray, make LCD be applied in large quantities personal digital aid (PDA) (personal digital assistant, PDA), in the various electronic product such as mobile computer, digital camera, digital camera camera, mobile phone, computer screen and LCD TV.Add the positive input research and development of industry and adopt the production equipment that maximizes, the quality of LCD is constantly promoted, and the lasting decline of price, therefore make the application of LCD enlarge rapidly.But, need could produce the function that shows with the light that backlight module provided because the display panels in the LCD is the display floater of non-self-luminosity.
Please be simultaneously with reference to Figure 1A and Figure 1B, Figure 1A has illustrated the part vertical view of traditional backlight module, and Figure 1B has illustrated the part equivalent circuit diagram of traditional backlight module.In Figure 1A and Figure 1B, backlight module 10 comprises one drive circuit 12, a circuit board 14 and a light emitting diode matrix 16 at least.Circuit board 14 has relative first side 14b and second side 14c are connected first side 14b and second side 14c with one end face 14a, and light emitting diode matrix 16 is disposed on the end face 14a of circuit board 14.Light emitting diode matrix 16 has several line light source groups, is that example explains at this with 3N line light source group, and the 1st line light source group and 3N line light source group are adjacent to first side 14b and second side 14c respectively.Each line light source group of these a little 3i line light source groups has several bluenesss (B) light-emitting diode, and each line light source group of these a little 3i-1 line light source groups has several greens (G) light-emitting diode, and each line light source group of these a little 3i-2 line light source groups has several redness (R) light-emitting diode.Wherein, the value of N and i is all positive integer, and the value of i is 1～N.
It should be noted that, these a little blue LEDs of 3i line light source group are to electrically connect in the mode of connecting, and these a little green LEDs of 3i-1 line light source group are to electrically connect in the mode of connecting, and these a little red light emitting diodes of 3i-2 line light source group are to electrically connect in the mode of connecting.In addition, the size and the packaged type of the luminescent grain of each red light emitting diodes are identical, and the size of the luminescent grain of each green LED and packaged type are identical, and the size of the luminescent grain of each blue LED and packaged type are identical.
Yet, produce in the process of light at light emitting diode matrix 16, because the 3N line light source group that has the 1st line light source group of several red light emitting diodes and have several blue LEDs is adjacent to first side 14b and second side 14c respectively, cause backlight module 10 will mixed light inhomogeneous, and in first side 14b and the pairing display panels of second side 14c, produce respectively color red partially and partially indigo plant phenomenon, promptly so-called color offset phenomenon.Therefore, need only the light emitting diode matrix of being formed with the light-emitting diode of multiple different colours all can produce mixed light inequality and colour cast in the pairing display panels of the side of circuit board phenomenon traditionally, the luminescent quality that influences backlight module is very huge.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of backlight module exactly.It utilizes the feeding electric current of light-emitting diode, the size of luminescent grain or the packaged type of luminescent grain to carry out the design of light emitting diode matrix, alleviating the colour cast degree of backlight module, and promotes the luminescent quality of backlight module.
According to purpose of the present invention, a kind of backlight module is proposed, comprise a circuit board, a light emitting diode matrix and one drive circuit.Circuit board has relative first side and second side are connected first side and second side with one end face.Light emitting diode matrix is arranged on the end face of circuit board, light emitting diode matrix has several line light source groups, as 3N line light source group, the 1st line light source group and 3N line light source group are adjacent to first side and second side respectively, each line light source group of 3i line light source group has several first light-emitting diodes, each line light source group of 3i-1 line light source group has several second light-emitting diodes, each line light source group of 3i-2 line light source group has several the 3rd light-emitting diodes, the value of N and i is all positive integer, and the value of i is 1～N.Drive circuit is in order to provide at least one electric current to light emitting diode matrix, make the brightness of each first light-emitting diode of 3N line light source group less than the brightness of each first light-emitting diode of the 3rd line light source group, the brightness of each the 3rd light-emitting diode of the 1st line light source group is less than the brightness of each the 3rd light-emitting diode of 3N-2 line light source group, and light emitting diode matrix produces uniform light.
According to a further object of the present invention, a kind of backlight module is proposed, comprise a circuit board, several light-emitting diodes and one drive circuit.These a little light-emitting diodes are disposed on the circuit board, drive circuit provides at least one electric current to these a little light-emitting diodes, make the brightness of these a little light-emitting diodes of part of the side be adjacent to circuit board less than the brightness of these a little light-emitting diodes of the part of the middle section of circuit board, and these a little light-emitting diodes are produced uniform light.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Figure 1A has illustrated the part vertical view of traditional backlight module.
Figure 1B has illustrated the part equivalent circuit diagram of traditional backlight module.
Fig. 2 A has illustrated the part vertical view according to the backlight module of embodiments of the invention one.
Fig. 2 B has illustrated the part equivalent circuit diagram according to the backlight module of embodiments of the invention one.
Fig. 3 has illustrated the part equivalent circuit diagram according to the backlight module of embodiments of the invention two.
Fig. 4 has illustrated the part equivalent circuit diagram according to the backlight module of embodiments of the invention three.
Fig. 5 A has illustrated the part vertical view according to the backlight module of embodiments of the invention four.
Fig. 5 B has illustrated the part equivalent circuit diagram according to the backlight module of embodiments of the invention four.
Embodiment
Embodiment one
Please refer to Fig. 2 A and Fig. 2 B, Fig. 2 A has illustrated the part vertical view according to the backlight module of embodiments of the invention one, and Fig. 2 B has illustrated the part equivalent circuit diagram according to the backlight module of embodiments of the invention one.In Fig. 2 A and Fig. 2 B, backlight module 20 comprises one drive circuit 22, a circuit board 24 and a light emitting diode matrix (light emitting diode, LED) 26 at least.Circuit board 24 has relative first side 24b and second side 24c are connected first side 24b and second side 24c with one end face 24a.Light emitting diode matrix 26 is arranged on the end face 24a of circuit board 24, light emitting diode matrix 26 has several line light source groups, is that example explains at this with 3N line light source group, and the 1st line light source group and 3N line light source group are adjacent to first side 24b and second side 24c respectively.Wherein, each line light source group of these a little 3i line light source groups has several first light-emitting diodes, each line light source group of these a little 3i-1 line light source groups has several second light-emitting diodes, and each line light source group of these a little 3i-2 line light source groups has several the 3rd light-emitting diodes.The value of N and i is all positive integer, and the value of i is 1～N.
In addition, each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode are the combination of the random order of red light emitting diodes, green LED and blue LED.At this, first light-emitting diode, second light-emitting diode and the 3rd light-emitting diode will be that example explains with blue LED, green LED and red light emitting diodes respectively.
It should be noted that, the size and the packaged type of the luminescent grain of each first light-emitting diode of these a little 3i line light source groups are identical, and the size and the packaged type of the luminescent grain of each second light-emitting diode of these a little 3i-1 line light source groups are identical, and the size and the packaged type of the luminescent grain of each the 3rd light-emitting diode of these a little 3i-2 line light source groups are identical.
Have a variety of as for drive circuit 22 and the mode that light emitting diode matrix 26 electrically connects, for example, a little first light-emitting diodes of this of each line light source group of these a little 3i line light source groups can utilize the mode of series connection and drive circuit 22 to electrically connect, each line light source group of these a little 3i-1 line light source groups a little second light-emitting diodes can utilize the mode of series connection and drive circuit 22 to electrically connect, a little the 3rd light-emitting diodes of this of each line light source group of these a little 3i-2 line light source groups can utilize the mode of series connection and drive circuit 22 to electrically connect, shown in Fig. 2 B.In addition, each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode can be connected with drive circuit 22 individually.
Under the big or small identical of luminescent grain and condition that packaged type is the same, have only to control the brightness of each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode by the electric current of each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode.Current value by electric current is big more, and the brightness of each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode is just high more.
Shown in Fig. 2 B, drive circuit 22 provides electric current I 31 to the 3rd line light source group or the first corresponding light-emitting diode, and drive circuit 22 provides electric current I 32 to these a little 3j line light source groups or the first corresponding light-emitting diode, and the current value of electric current I 32 is less than the current value of electric current I 31.Wherein, the value of j is a positive integer, and the value of j is 2～N-1, and the current value of the electric current I 32 that received of each first light-emitting diode of these a little 3j line light source groups is identical.Drive circuit 22 provides electric current I 33 to 3N line light source group or the first corresponding light-emitting diode, and the current value of electric current I 33 is less than the current value of I32.When drive circuit 22 provides corresponding electric current to these a little 3i line light source groups or each first light-emitting diode, the brightness of each first light-emitting diode of 3N line light source group is less than the brightness of each first light-emitting diode of the 3rd line light source group, and the brightness system of each first light-emitting diode of these a little 3j line light source groups is between the brightness of each first light-emitting diode of the brightness of each first light-emitting diode of 3N line light source group and the 3rd line light source group.
Drive circuit 22 provides electric current I 11 to 3N-2 line light source group or the 3rd corresponding light-emitting diode, and drive circuit 22 provides electric current I 12 each the 3rd light-emitting diode to these a little 3k-2 line light source groups, and the current value of electric current I 12 is less than the current value of electric current I 11.Wherein, the value of k is a positive integer, and the value of k is 2～N-1, and the current value of the electric current I 12 that received of each the 3rd light-emitting diode of these a little 3k-2 line light source groups is identical.Drive circuit 22 provides electric current I 13 to the 1st line light source group or the 3rd corresponding light-emitting diode, and the current value of electric current I 13 is less than the current value of I12.When drive circuit 22 provides corresponding electric current to these a little 3i-2 line light source groups or each the 3rd light-emitting diode, the brightness of each the 3rd light-emitting diode of the 1st line light source group is less than the brightness of each the 3rd light-emitting diode of 3N-2 line light source group, and the brightness of each the 3rd light-emitting diode of these a little 3k-2 line light source groups is between the brightness of each the 3rd light-emitting diode of the brightness of each the 3rd light-emitting diode of 3N-2 line light source group and the 1st line light source group.In addition, drive circuit 22 provides electric current I 2 each second light-emitting diode to these a little 3i-1 line light source groups, makes that the brightness of each second light-emitting diode of these a little 3i-1 line light source groups is identical.Thus, can alleviate the colour cast degree of backlight module 20, and promote the luminescent quality of backlight module 20.
Embodiment two
Please refer to Fig. 3, it has illustrated the part equivalent circuit diagram according to the backlight module of embodiments of the invention two.In Fig. 3, the backlight module 30 of present embodiment is that with backlight module 20 differences of embodiment one backlight module 30 comprises drive circuit 32a, 32b, 32c, 32d, 32e, 32f and 32g.As for backlight module 30 backlight module 20 something in common with embodiment one, be arranged at the arrangement mode on the end face 24a of circuit board 24 of Fig. 2 A as light emitting diode matrix 26, do not repeat them here.
Embodiment three
Please refer to Fig. 4, it has illustrated the part equivalent circuit diagram according to the backlight module of embodiments of the invention three.In Fig. 4, the backlight module 40 of present embodiment is that with backlight module 20 differences of embodiment one backlight module 40 comprises drive circuit 42 and current-limiting resistance R1, R2, R3 and R4.As for backlight module 40 backlight module 20 something in common with embodiment one, be arranged at the arrangement mode on the end face 24a of circuit board 24 of Fig. 2 A as light emitting diode matrix 26, do not repeat them here.
Drive circuit 42 provides voltage V1 these a little 3i line light source groups to light emitting diode matrix 26, current-limiting resistance R1 electrically connects drive circuit 42 and this a little 3j line light source groups, or, current-limiting resistance R1 electrically connects drive circuit 42 and the first corresponding light-emitting diode, make the 3rd line light source group or each corresponding first light-emitting diode received current I1, and the current value of the electric current I 11 by the capable light source group of these a little 3j or corresponding first light-emitting diode is less than the current value of electric current I 1.Wherein, the value of j is a positive integer, and the value of j is 2～N-1.Current-limiting resistance R2 electrically connects drive circuit 42 and the capable light source group of 3N, or, current-limiting resistance R2 electrically connects drive circuit 42 and the first corresponding light-emitting diode, because the resistance value of current-limiting resistance R2 greater than the resistance value of current-limiting resistance R1, makes current value by the electric current I 12 of the capable light source group of 3N or corresponding first light-emitting diode less than the current value of electric current I 11.
Drive circuit 42 provides voltage V3 these a little 3i-2 line light source groups to light emitting diode matrix 26, current-limiting resistance R3 electrically connects drive circuit 42 and this a little 3k-2 line light source groups, or, current-limiting resistance R3 electrically connects drive circuit 42 and the 3rd corresponding light-emitting diode, make each the 3rd light-emitting diode received current I3 of 3N-2 line light source group, and the current value of the electric current I 33 by capable light source group of these a little 3k-2 or corresponding the 3rd light-emitting diode is less than the current value of electric current I 3.Wherein, the value of k is a positive integer, and the value of k is 2～N-1.Current-limiting resistance R4 electrically connects the light source group of drive circuit 42 and the 1st row, or, current-limiting resistance R4 electrically connects drive circuit 42 and the 3rd corresponding light-emitting diode, because the resistance value of current-limiting resistance R4 greater than the resistance value of current-limiting resistance R3, makes current value by the electric current I 34 of the light source group of the 1st row or corresponding the 3rd light-emitting diode less than the current value of electric current I 33.In addition, drive circuit 42 is in order to provide electric current I 2 to these a little 3i-1 line light source groups or each second light-emitting diode.Thus, can alleviate the colour cast degree of backlight module 40, and promote the luminescent quality of backlight module 40.
Embodiment four
Please refer to Fig. 5 A and Fig. 5 B, Fig. 5 A has illustrated the part vertical view according to the backlight module of embodiments of the invention four, and Fig. 5 B has illustrated the part equivalent circuit diagram according to the backlight module of embodiments of the invention four.In Fig. 5 A and Fig. 5 B, backlight module 50 comprises one drive circuit 52, a circuit board 54 and a light emitting diode matrix 56 at least.Circuit board 54 has relative first side 54b and second side 54c are connected first side 54b and second side 54c with one end face 54a.Light emitting diode matrix 56 is arranged on the end face 54a of circuit board 54, light emitting diode matrix 56 has several line light source groups, is that example explains at this with 3N line light source group, and the 1st line light source group and 3N line light source group are adjacent to first side 54b and second side 54c respectively.Each line light source group of these a little 3i line light source groups has several first light-emitting diodes, and each line light source group of these a little 3i-1 line light source groups has several second light-emitting diodes, and each line light source group of these a little 3i-2 line light source groups has several the 3rd light-emitting diodes.The value of N and i is all positive integer, and the value of i is 1～N.
In addition, drive circuit 52 provides electric current I 3, I2 and I1 to each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode respectively, makes light emitting diode matrix 56 produce more uniform light.Under the same condition of the current value packaged type identical and luminescent grain that feeds electric current, have the brightness of adjusting each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode with the size of the luminescent grain of each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode only.When the size of luminescent grain was big more, the brightness of each first light-emitting diode, each second light-emitting diode and each the 3rd light-emitting diode was just high more.
In these a little 3i line light source groups, the size of the luminescent grain of each first light-emitting diode of 3N line light source group is less than the size of the luminescent grain of each first light-emitting diode of the 3rd line light source group.The size of the luminescent grain of each first light-emitting diode of these a little 3j line light source groups is between the size of the luminescent grain of each first light-emitting diode of big or small and the 3rd line light source group of the luminescent grain of each first light-emitting diode of 3N line light source group.Wherein, the value of j is a positive integer, and the value of j is 2～N-1.In addition, the luminescent grain of each first light-emitting diode of these a little 3j line light source groups is big or small identical.When drive circuit 52 provides electric current I 3 to these a little 3i line light source groups or each first light-emitting diode, the brightness of each first light-emitting diode of 3N line light source group is less than the brightness of each first light-emitting diode of the 3rd line light source group, and the brightness of each first light-emitting diode of these a little 3j line light source groups is between the brightness of each first light-emitting diode of the brightness of each first light-emitting diode of 3N line light source group and the 3rd line light source group.
In addition, in these a little 3i-2 line light source groups, the size of the luminescent grain of each the 3rd light-emitting diode of the 1st line light source group is less than the size of the luminescent grain of each three light-emitting diode of 3N-2 line light source group.The size of the luminescent grain of each the 3rd light-emitting diode of these a little 3k-2 line light source groups is between the size of the luminescent grain of each first light-emitting diode of big or small and the 1st line light source group of the luminescent grain of each the 3rd light-emitting diode of this 3N-2 line light source group.Wherein, the value of k is a positive integer, and the value of k is 2～N-1.In addition, the luminescent grain of each the 3rd light-emitting diode of these a little 3k-2 line light source groups is big or small identical.When drive circuit 52 provides electric current I 1 to these a little 3i-2 line light source groups or each the 3rd light-emitting diode, the brightness of each the 3rd light-emitting diode of 3N-2 line light source group is greater than the brightness of each the 3rd light-emitting diode of the 1st line light source group, and the brightness of each the 3rd light-emitting diode of these a little 3k-2 line light source groups is between the brightness of each the 3rd light-emitting diode of the brightness of each the 3rd light-emitting diode of 3N-2 line light source group and the 1st line light source group.In addition, when drive circuit 52 provides electric current I 2 to these a little 3i-1 line light source groups or each second light-emitting diode, because the luminescent grain of each second light-emitting diode of these a little 3i-1 line light source groups is big or small identical, so the brightness of each second light-emitting diode of a little 3i-1 line light source groups is identical.Thus, can alleviate the colour cast degree of backlight module 50, and promote the luminescent quality of backlight module 50.
So being familiar with present technique field person can understand that technology of the present invention is not confined to this, for example, under the equirotal condition of and luminescent grain identical at the current value that feeds electric current, the present invention can according to the height that different packaged type forms of luminescent grain, in reach low-light level first light-emitting diode and the 3rd light-emitting diode design.Wherein, the 3rd line light source group has first light-emitting diode of several high brightness, and 3N line light source group has first light-emitting diode of several low-light levels, and each line light source group of these a little 3j line light source groups has first light-emitting diode of brightness in several.Wherein, the value of j is a positive integer, and the value of j is 2～N-1.In addition, 3N-2 line light source group has the 3rd light-emitting diode of several high brightness, and the 1st line light source group has the 3rd light-emitting diode of several low-light levels, and each line light source group of these a little 3k-2 line light source groups has the 3rd light-emitting diode of brightness in several.Wherein, the value of k is a positive integer, and the value of k is 2～N-1.
In other embodiments, backlight module of the present invention comprises one drive circuit, a circuit board and is disposed at several light-emitting diodes on the circuit board, drive circuit can provide electric current to these a little light-emitting diodes according to the technology contents that the foregoing description disclosed, make the brightness of part light-emitting diode of the side be adjacent to circuit board less than the brightness of the part light-emitting diode of the middle section of circuit board, and light emitting diode matrix produce uniform light.
The backlight module that the above embodiment of the present invention disclosed, it utilizes the feeding electric current of each light-emitting diode, the size of luminescent grain or the packaged type of luminescent grain to carry out the design of light emitting diode matrix, alleviating the colour cast degree of backlight module, and promote the luminescent quality of backlight module.
Claims (26)
1. backlight module comprises:
One circuit board has relative first side and second side are connected this first side and this second side with one end face;
One light emitting diode matrix, be arranged on this end face of this circuit board, this light emitting diode matrix has 3N line light source group, the 1st line light source group and this 3N line light source group are adjacent to this first side and this second side respectively, respectively this line light source group of those 3i line light source groups has a plurality of first light-emitting diodes, respectively this line light source group of those 3i-1 line light source groups has a plurality of second light-emitting diodes, respectively this line light source group cording of those 3i-2 line light source groups has a plurality of the 3rd light-emitting diodes, the value of N and i is all positive integer, and the value of i is 1～N; And
One drive circuit, in order to provide at least one electric current to this light emitting diode matrix, make the brightness of respectively this first light-emitting diode of this 3N line light source group less than the respectively brightness of this first light-emitting diode of the 3rd line light source group, the brightness of respectively the 3rd light-emitting diode of the 1st line light source group is less than the respectively brightness of the 3rd light-emitting diode of this 3N-2 line light source group, and this light emitting diode matrix produces uniform light.
2. backlight module as claimed in claim 1, it is characterized in that, the luminescent grain of respectively this first light-emitting diode of those 3i line light source groups big or small identical, and the luminescent grain of respectively this second light-emitting diode of those 3i-1 line light source groups is big or small identical, and the luminescent grain of respectively the 3rd light-emitting diode of those 3i-2 line light source groups is big or small identical.
3. backlight module as claimed in claim 2, it is characterized in that, the current value of the electric current that the current value of the electric current that the current value of the electric current that respectively this first light-emitting diode of this 3N line light source group is received is received less than respectively this first light-emitting diode of the 3rd line light source group, the current value of the electric current that respectively the 3rd light-emitting diode of the 1st line light source group is received are received less than respectively the 3rd light-emitting diode of this 3N-2 line light source group.
4. backlight module as claimed in claim 3, it is characterized in that, the current value of the electric current that respectively this first light-emitting diode of those 3j line light source groups is received is between the current value of the electric current that respectively this first light-emitting diode of the current value of the electric current that respectively this first light-emitting diode of this 3N line light source group is received and the 3rd line light source group is received, wherein, the value of j is a positive integer, and the value of j is 2～N-1.
5. backlight module as claimed in claim 4 is characterized in that, the current value of the electric current that respectively this first light-emitting diode of those 3j line light source groups is received is identical.
6. backlight module as claimed in claim 4 is characterized in that, this drive circuit provides a voltage to this light emitting diode matrix, makes respectively this first light-emitting diode of the 3rd line light source group receive an electric current, and this backlight module also comprises:
First current-limiting resistance electrically connects respectively this first light-emitting diodes of this drive circuit and those 3j line light source groups, makes the current value of the respectively electric current of this first light-emitting diode by those 3j line light source groups less than the current value of this electric current; And
Second current-limiting resistance, respectively this first light-emitting diode that connects this drive circuit and this 3N line light source group, the resistance value of this second current-limiting resistance is greater than the resistance value of this first current-limiting resistance, makes the current value of the respectively electric current of this first light-emitting diode by this 3N line light source group less than the respectively current value of the electric current of this first light-emitting diode by those 3j line light source groups.
7. backlight module as claimed in claim 4 is characterized in that, this drive circuit also comprises:
First drive circuit is in order to provide first electric current respectively this first light-emitting diode to the 3rd line light source group;
Second drive circuit is given respectively this first light-emitting diode of those 3j line light source groups in order to second electric current to be provided, and the current value of this second electric current is less than the current value of this first electric current; And
The 3rd drive circuit, in order to the 3rd electric current respectively this first light-emitting diode to this 3N line light source group to be provided, the current value of the 3rd electric current is less than the current value of this second electric current.
8. backlight module as claimed in claim 4 is characterized in that, those first light-emitting diodes of respectively this line light source group of those 3i line light source groups are to electrically connect in the mode of connecting.
9. backlight module as claimed in claim 8 is characterized in that, this drive circuit provides a voltage to this light emitting diode matrix, makes the 3rd line light source group of received one electric current, and this backlight module also comprises:
First current-limiting resistance electrically connects this drive circuit and those 3j line light source groups, makes the current value of the electric current by this 3j light source group less than the current value of this electric current; And
Second current-limiting resistance, connect this drive circuit and this 3N line light source group, the resistance value of this second current-limiting resistance is greater than the resistance value of this first current-limiting resistance, makes the current value of the electric current by this 3N line light source group less than the current value of the electric current by this 3j line light source group.
10. backlight module as claimed in claim 8 is characterized in that, this drive circuit also comprises:
First drive circuit is in order to provide first electric current to the 3rd line light source group;
Second drive circuit is given those 3j line light source groups in order to second electric current to be provided, and the current value of this second electric current is less than the current value of this first electric current; And
The 3rd drive circuit, in order to provide the 3rd electric current to this 3N line light source group, the current value of the 3rd electric current is less than the current value of this second electric current.
11. backlight module as claimed in claim 3, it is characterized in that, the current value of the electric current that respectively the 3rd light-emitting diode of those 3k-2 line light source groups is received is between the current value of the electric current that respectively the 3rd light-emitting diode of the current value of the electric current that respectively the 3rd light-emitting diode of this 3N-2 line light source group is received and the 1st line light source group is received, wherein, the value of k is a positive integer, and the value of k is 2～N-1.
12. backlight module as claimed in claim 11 is characterized in that, the current value of the electric current that respectively the 3rd light-emitting diode of those 3k-2 line light source groups is received is identical.
13. backlight module as claimed in claim 11 is characterized in that, this drive circuit provides a voltage to this light emitting diode matrix, and respectively the 3rd light-emitting diode of this 3N-2 line light source group receives an electric current, and this backlight module also comprises:
First current-limiting resistance electrically connects respectively the 3rd light-emitting diode of this drive circuit and those 3k-2 line light source groups, makes the current value of the respectively electric current of the 3rd light-emitting diode by those 3k-2 line light source groups less than the current value of this electric current; And
Second current-limiting resistance, respectively the 3rd light-emitting diode that connects this drive circuit and the 1st line light source group, the resistance value of the 4th current-limiting resistance is greater than the resistance value of the 3rd current-limiting resistance, makes the current value of the respectively electric current of the 3rd light-emitting diode by the 1st line light source group less than the respectively current value of the electric current of the 3rd light-emitting diode by those 3k-2 line light source groups.
14. backlight module as claimed in claim 11 is characterized in that, this drive circuit also comprises:
First drive circuit is in order to provide respectively three light-emitting diode of first electric current to this 3N-2 line light source group;
Second drive circuit is given respectively the 3rd light-emitting diode of those 3k-2 line light source groups in order to second electric current to be provided, and the current value of this second electric current is less than the current value of this first electric current; And
The 3rd drive circuit, in order to respectively three light-emitting diode of one the 3rd electric current to the 1st line light source group to be provided, the current value of the 3rd electric current is less than the current value of this second electric current.
15. backlight module as claimed in claim 11 is characterized in that, those the 3rd light-emitting diodes of respectively this line light source group of those 3i-2 line light source groups electrically connect in the mode of series connection.
16. backlight module as claimed in claim 15 is characterized in that, this drive circuit provides a voltage to this light emitting diode matrix, this this electric current of 3N-2 line light source group of received, and this backlight module also comprises:
First current-limiting resistance electrically connects this drive circuit and those 3k-2 line light source groups, makes the current value of the electric current by those 3k-2 line light source groups less than the current value of this electric current; And
Second current-limiting resistance, connect this drive circuit and the 1st line light source group, the resistance value of the 4th current-limiting resistance is greater than the resistance value of the 3rd current-limiting resistance, makes the current value of the electric current by the 1st line light source group less than the current value of the electric current by those 3k-2 line light source groups.
17. backlight module as claimed in claim 15 is characterized in that, this drive circuit also comprises:
First drive circuit is in order to provide first electric current to this 3N-2 line light source group;
Second drive circuit is given those 3k-2 line light source groups in order to second electric current to be provided, and the current value of this second electric current is less than the current value of this first electric current; And
The 3rd drive circuit, in order to provide one the 3rd electric current to the 1st line light source group, the current value of the 3rd electric current is less than the current value of this second electric current.
18. backlight module as claimed in claim 3 is characterized in that, the current value of the electric current that respectively this second light-emitting diode of those 3i-1 line light source groups is received is identical.
19. backlight module as claimed in claim 3 is characterized in that, those second light-emitting diodes of this 3i-1 line light source group electrically connect in the mode of series connection.
20. backlight module as claimed in claim 1, it is characterized in that, respectively this first light-emitting diode, respectively the color of this second light-emitting diode and each those the 3rd light-emitting diode is the combination of the random order of red light emitting diodes, green LED and blue LED.
21. a backlight module comprises:
One circuit board;
A plurality of light-emitting diodes are disposed on this circuit board; And
One drive circuit, provide at least one electric current to those light-emitting diodes, make the brightness of those light-emitting diodes of part of the side be adjacent to this circuit board less than the brightness of those light-emitting diodes of the part of the middle section of this circuit board, and those light-emitting diodes produce uniform light.
22. backlight module as claimed in claim 21 is characterized in that, the luminescent grain of those light-emitting diodes big or small identical.
23. backlight module as claimed in claim 22, it is characterized in that, be adjacent to the side of this circuit board, the current value of the electric current that those light-emitting diodes received of part less than the current value of the electric current that those light-emitting diodes received of the part of the middle section of this circuit board.
24. backlight module as claimed in claim 23 is characterized in that, this drive circuit provides a voltage to those light-emitting diodes, and those light-emitting diodes of the part of the middle section of this circuit board receive an electric current, and this backlight module also comprises:
First current-limiting resistance, electrically connect this drive circuit and be adjacent to those light-emitting diodes of part of the side of this circuit board, make the current value of electric current of those light-emitting diodes of part of the side by being adjacent to this circuit board less than the current value of this electric current.
25. backlight module as claimed in claim 23 is characterized in that, this drive circuit also comprises:
First drive circuit is in order to provide those light-emitting diodes of the part of first electric current to the middle section of this circuit board; And
Second drive circuit, in order to those light-emitting diodes of the part of second electric current to the side that is adjacent to this circuit board to be provided, the current value of this second electric current is less than the current value of this first electric current.
26. backlight module as claimed in claim 21 is characterized in that, those light-emitting diodes are a plurality of red light emitting diodes, a plurality of green LED and a plurality of blue LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101199495A CN100546422C (en) | 2003-11-27 | 2003-11-27 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101199495A CN100546422C (en) | 2003-11-27 | 2003-11-27 | Backlight module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1545372A true CN1545372A (en) | 2004-11-10 |
| CN100546422C CN100546422C (en) | 2009-09-30 |
Family
ID=34338260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101199495A Expired - Fee Related CN100546422C (en) | 2003-11-27 | 2003-11-27 | Backlight module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100546422C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371800C (en) * | 2005-06-15 | 2008-02-27 | 友达光电股份有限公司 | Backlight module structure |
| CN101329047B (en) * | 2008-07-22 | 2010-06-09 | 友达光电股份有限公司 | Light source module and liquid crystal display |
| CN101338877B (en) * | 2007-07-03 | 2010-10-13 | 中华映管股份有限公司 | Light emitting diode array and backlight module |
| US8018424B2 (en) | 2006-10-19 | 2011-09-13 | Au Optronics Corporation | Backlight device with zone control |
| CN102196622A (en) * | 2010-03-03 | 2011-09-21 | 硕颉科技股份有限公司 | Backlight device |
| CN101632038B (en) * | 2006-09-26 | 2012-01-11 | Lg电子株式会社 | Light emitting device, backlight unit and printed circuit board thereof |
| WO2012012959A1 (en) * | 2010-07-30 | 2012-02-02 | 深圳市华星光电技术有限公司 | Backlight module |
| TWI478136B (en) * | 2006-12-01 | 2015-03-21 | Sony Corp | Apparatus and method for controlling backlight and liquid crystal display |
| CN107153301A (en) * | 2017-06-21 | 2017-09-12 | 北京小米移动软件有限公司 | Backlight module, display module and electronic equipment |
| CN109906404A (en) * | 2016-11-01 | 2019-06-18 | 夏普株式会社 | Backlight device and display device including the same |
| CN110716345A (en) * | 2018-07-11 | 2020-01-21 | 夏普株式会社 | Chip mounting substrate, display device, and method for manufacturing chip mounting substrate |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03104768U (en) * | 1990-02-15 | 1991-10-30 | ||
| JP2001147675A (en) * | 1999-11-24 | 2001-05-29 | Matsushita Electric Works Ltd | Display unit |
| KR100788382B1 (en) * | 2000-12-13 | 2007-12-31 | 엘지.필립스 엘시디 주식회사 | Backlight Unit of LCD |
| CN2480990Y (en) * | 2001-06-18 | 2002-03-06 | 广东科龙电器股份有限公司 | Color changeable multi-color type back lingting board for LED |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100371800C (en) * | 2005-06-15 | 2008-02-27 | 友达光电股份有限公司 | Backlight module structure |
| CN101632038B (en) * | 2006-09-26 | 2012-01-11 | Lg电子株式会社 | Light emitting device, backlight unit and printed circuit board thereof |
| US8018424B2 (en) | 2006-10-19 | 2011-09-13 | Au Optronics Corporation | Backlight device with zone control |
| TWI478136B (en) * | 2006-12-01 | 2015-03-21 | Sony Corp | Apparatus and method for controlling backlight and liquid crystal display |
| CN101338877B (en) * | 2007-07-03 | 2010-10-13 | 中华映管股份有限公司 | Light emitting diode array and backlight module |
| CN101329047B (en) * | 2008-07-22 | 2010-06-09 | 友达光电股份有限公司 | Light source module and liquid crystal display |
| CN102196622A (en) * | 2010-03-03 | 2011-09-21 | 硕颉科技股份有限公司 | Backlight device |
| CN102196622B (en) * | 2010-03-03 | 2013-10-16 | 硕颉科技股份有限公司 | Backlight device |
| WO2012012959A1 (en) * | 2010-07-30 | 2012-02-02 | 深圳市华星光电技术有限公司 | Backlight module |
| CN109906404A (en) * | 2016-11-01 | 2019-06-18 | 夏普株式会社 | Backlight device and display device including the same |
| CN109906404B (en) * | 2016-11-01 | 2022-03-04 | 夏普株式会社 | Backlight device and display device including the same |
| CN107153301A (en) * | 2017-06-21 | 2017-09-12 | 北京小米移动软件有限公司 | Backlight module, display module and electronic equipment |
| CN110716345A (en) * | 2018-07-11 | 2020-01-21 | 夏普株式会社 | Chip mounting substrate, display device, and method for manufacturing chip mounting substrate |
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| Publication number | Publication date |
|---|---|
| CN100546422C (en) | 2009-09-30 |
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