CN201310785Y - Light emitting diode backlight source - Google Patents
Light emitting diode backlight source Download PDFInfo
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- CN201310785Y CN201310785Y CNU2008201246649U CN200820124664U CN201310785Y CN 201310785 Y CN201310785 Y CN 201310785Y CN U2008201246649 U CNU2008201246649 U CN U2008201246649U CN 200820124664 U CN200820124664 U CN 200820124664U CN 201310785 Y CN201310785 Y CN 201310785Y
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Abstract
The utility model relates to a light emitting diode backlight source which comprises a bottom plate, wherein a light emitting diode group, a control device and an optical sensing device are arranged on the bottom plate, and the light emitting diode group and the optical sensing device which is used for receiving optical signals are connected with the control device which is used for controlling light emitting diodes in the light emitting diode group to light or go out according to the received optical signals. The light emitting diode backlight source is provided with the light emitting diode group, the control device and the optical sensing device; when the illumination of the light emitting diodes or light emitting diode strings in the light emitting diode group is changed, the light emitting diodes in the light emitting diode backlight source can be replaced, the light emitting diodes or the lightened light emitting diode strings which are originally lightened are went out, the light emitting diodes or the lightened light emitting diode strings which are originally went out are lightened, the light emitting diode backlight source can be ensured to be normally used, and the brightness and the uniformity of the light emitting diode backlight source are ensured.
Description
Technical field
The utility model relates to a kind of backlight, particularly a kind of back light source in LED.
Background technology
At present, for power consumption, the enhancing feature of environmental protection that reduces display screen, the small-medium size flat-panel monitor adopts light emitting diode (Light Emitting Diode is called for short LED) as backlight basically, adopts light emitting diode also in research and development and trial production stage in the large scale flat-panel monitor.Light emitting diode is to be made by several layers of very thin doped semiconductor material, one deck has excessive electronics, and another layer then lacks electronics and form " hole " of positively charged, when electric current passes through, electronics and hole mutually combine, and unnecessary energy then discharges with the form of light radiation.Light emitting diode has more advantage, and, uniformity higher as screen intensity is better, color representation power is stronger etc., and the advantage of back light source in LED is to make backlight slimming, lightweight, does not need converter, no mercury and power saving or the like.
For the back light source in LED that is applied to the small-medium size flat-panel monitor, owing to use the negligible amounts of light emitting diode in the backlight, therefore wherein any one light emitting diode breaks down and all can reduce the brightness and the uniformity of backlight significantly.At present, when damaging appears in light emitting diode, can only adopt and take backlight apart change light emitting diode method, complicated operation, the time is long, also can cause other damage of backlight sometimes.
The utility model content
The purpose of this utility model provides a kind of back light source in LED, effectively solves existing backlight light emitting diode and damages technological deficiencies such as reducing the back light source brightness and the uniformity.
To achieve these goals, the utility model provides a kind of back light source in LED, comprise base plate, described base plate is provided with light emitting diode group, control device and optical sensing means, and described light emitting diode group is connected with the control device of lighting according to the optical signal control light emitting diode group light emitting diode that receives or extinguish with the optical sensing means that is used for receiving optical signals.
Described light emitting diode group comprises two light emitting diodes or two light emitting diode string, and each light emitting diode string comprises the light emitting diode that several are connected in series successively.
Described control device comprises modular converter, comparison module and switch module, receiving optical signals and the modular converter that optical signal is converted to voltage signal are connected with optical sensing means, receive voltage signal and be connected with modular converter, control the switch module that light emitting diode that light emitting diode or the light emitting diode string extinguished originally light, lighted originally or light emitting diode string extinguish according to control signal and be connected with the light emitting diode group according to the comparison module that relatively generates control signal of voltage signal.
Described optical sensing means is arranged on the top of described base plate, the left side of base plate, the right side of base plate or the middle part of base plate.
Described light emitting diode is white light-emitting diode or colorful light-emitting diode.
To achieve these goals, the utility model also provides a kind of back light source in LED, comprise base plate, described base plate is provided with light emitting diode group and control device, and light emitting diode is lighted or the control device that extinguishes is connected with described light emitting diode group in the control light emitting diode group.
Described light emitting diode group comprises two light emitting diodes or two light emitting diode string, and each light emitting diode string comprises the light emitting diode that several are connected in series successively.
Described control device comprises comparison module, first switch module and second switch module, be attempted by the two ends of a light emitting diode or light emitting diode string according to the comparison module of detected voltage drop generation control signal, described first switch module is connected in series with a light emitting diode or light emitting diode string, described second switch module is connected in series with another light emitting diode or light emitting diode string, receives described control signal and control light emitting diode or the light emitting diode string lighted are originally extinguished, first switch module that light emitting diode that control was extinguished originally or light emitting diode string are lighted is connected with described comparison module with the second switch module.
Described light emitting diode is white light-emitting diode or colorful light-emitting diode.
The utility model proposes a kind of back light source in LED.One of them scheme is by light emitting diode group, control device and optical sensing means are set, when the brightness of light emitting diode in the light emitting diode group or light emitting diode string changes, can realize the replacement of light emitting diode in the back light source in LED or light emitting diode string, light emitting diode or the light emitting diode string soon lighted are originally extinguished, and light emitting diode or the light emitting diode string extinguished are originally lighted.Wherein another scheme is by light emitting diode group and control device are set, when the voltage drop at light emitting diode in the light emitting diode group or light emitting diode string two ends changes, can realize the replacement of light emitting diode in the back light source in LED or light emitting diode string, light emitting diode or the light emitting diode string soon lighted are originally extinguished, and light emitting diode or the light emitting diode string extinguished are originally lighted.The utility model back light source in LED has not only guaranteed the normal use of back light source in LED, and has guaranteed the brightness and the uniformity of back light source in LED.Compared with prior art, the utility model can detect the user mode of back light source in LED automatically, can replace automatically when damaging appears in light emitting diode, need not the dismounting reparation, has broad application prospects.
Description of drawings
Fig. 1 is the structural representation of the utility model back light source in LED first embodiment;
Fig. 2 is the structural representation of control device among the utility model back light source in LED first embodiment;
Fig. 3 is the structural representation of the utility model back light source in LED second embodiment;
Fig. 4 is the structural representation of the utility model back light source in LED the 3rd embodiment;
Fig. 5 is the structural representation of the utility model back light source in LED the 4th embodiment.
Description of reference numerals:
The 1-base plate; 2-light emitting diode group; The 3-control device;
The 4-optical sensing means; 21-first light emitting diode; 22-second light emitting diode;
The 31-modular converter; The 32-comparison module; The 33-switch module;
34-first switch module; 35-second switch module.
The specific embodiment
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Fig. 1 is the structural representation of the utility model back light source in LED first embodiment.As shown in Figure 1, the agent structure of present embodiment back light source in LED comprises base plate 1, light emitting diode group 2, control device 3 and optical sensing means 4, light emitting diode group 2 is fixed on the base plate 1, comprises first light emitting diode 21 and second light emitting diode 22; Optical sensing means 4 is fixed on the base plate 1, is used to receive the optical signal that first light emitting diode 21 or second light emitting diode 22 send, and optical signal is sent to control device 3; Control device 3 is fixed on the base plate 1, be connected with optical sensing means 4 with light emitting diode group 2 respectively, be used to receive the optical signal that optical sensing means 4 sends, originally second light emitting diode 22 that first light emitting diode 21 that extinguished according to the optical signal control that receives is lighted, lighted originally extinguishes, or second light emitting diode 22 that first light emitting diode 21 lighted originally of control extinguishes, extinguished is originally lighted.
Fig. 2 is the structural representation of control device among the utility model back light source in LED first embodiment.As shown in Figure 2, the present embodiment control device comprises modular converter 31, comparison module 32 and switch module 33, and modular converter 31 is connected with optical sensing means 4, is used to receive the optical signal that optical sensing means 4 sends, convert optical signal to voltage signal, and voltage signal is sent to comparison module 32; Comparison module 32 is connected with modular converter 31, is used to receive the voltage signal that modular converter 31 sends, and by the relatively generation control signal of voltage signal, and control signal is sent to switch module 33; The input of switch module 33 is connected with comparison module 32, two outputs are connected with second light emitting diode 22 with first light emitting diode 21 respectively, be used to receive the control signal that comparison module 32 sends, second light emitting diode 22 that first light emitting diode 21 that control was extinguished originally according to this control signal is lighted, lighted originally extinguishes, or second light emitting diode 22 that first light emitting diode 21 lighted originally of control extinguishes, extinguished is originally lighted.
The course of work of present embodiment back light source in LED is: if a light emitting diode in the light emitting diode group 2 (for example first light emitting diode 21) continues to light, the optical signal that optical sensing means 4 receives does not change, voltage signal in the control device 3 after modular converter 31 conversions does not change yet, be that voltage signal and the present voltage signal of constantly receiving that comparison module 32 previous moment are received do not change, comparison module 32 does not have control signal to generate, so switch module 33 is not worked.If the brightness of a light emitting diode in the light emitting diode group 2 (for example first light emitting diode 21) reduces, the modular converter 31 that receives low light level signal converts the voltage signal of a low voltage to, comparison module 32 receive behind the voltage signal of low voltage with the voltage signal of previous moment relatively, when the difference of the two surpasses setting value, 32 of comparison modules produce control signal, as a high level signal, after switch module 33 receives high level signal, then disconnect the circuit of first light emitting diode 21, first light emitting diode 21 is extinguished, connect the circuit of second light emitting diode 22, second light emitting diode 22 is lighted.So just finished the replacement of light emitting diode in the back light source in LED smoothly, not only guaranteed the normal use of back light source in LED, and guaranteed the brightness and the uniformity of back light source in LED.
In the present embodiment, optical sensing means can adopt optical sensor, the position of optical sensor can be arranged on any position of base plate according to the needs of accurate receiving optical signals, for example can be arranged on the top of base plate, the left side of base plate, the right side of base plate or the middle part of base plate.
Fig. 3 is the structural representation of the utility model back light source in LED second embodiment.As shown in Figure 3, the agent structure of present embodiment back light source in LED comprises base plate 1, light emitting diode group 2, control device 3 and optical sensing means 4, light emitting diode group 2 is fixed on the base plate 1, comprise first light emitting diode string and second light emitting diode string, each light emitting diode string comprises the light emitting diode that several are connected successively; Optical sensing means 4 is fixed on the base plate 1, is used to receive the optical signal that first light emitting diode string or second light emitting diode string are sent, and optical signal is sent to control device 3; Control device 3 is fixed on the base plate 1, be connected with optical sensing means 4 with light emitting diode group 2 respectively, be used to receive the optical signal that optical sensing means 4 sends, originally second light emitting diode string that first light emitting diode string of extinguishing according to the optical signal control that receives is lighted, lighted is originally extinguished, or second light emitting diode string that first light emitting diode string lighted originally of control is extinguished, extinguished is originally lighted.
The agent structure of present embodiment back light source in LED and aforementioned first embodiment are basic identical, and different is, present embodiment light emitting diode group comprises two light emitting diode string, and each light emitting diode string comprises the light emitting diode that several are connected successively.The structure of present embodiment optical sensing means and control device is identical with aforementioned first embodiment, the course of work is also basic identical with aforementioned first embodiment, when the brightness of any one light emitting diode in the light emitting diode string goes wrong, promptly carry out the replacement of light emitting diode string.
In the present embodiment back light source in LED, the LED driving circuit that is connected with each light emitting diode string can also be set as required, two LED driving circuits are used for driving respectively two light emitting diode string of light emitting diode group, and each LED driving circuit is connected with an output of switch module in the control device.Light emitting diode is white light-emitting diode or colorful light-emitting diode.
Fig. 4 is the structural representation of the utility model back light source in LED the 3rd embodiment.As shown in Figure 4, the agent structure of present embodiment back light source in LED comprises base plate 1, light emitting diode group 2, control device 3 and drive circuit 5, and the light emitting diode group is fixed on the base plate 1, comprises first light emitting diode 21 and second light emitting diode 22; Control device 3 comprises comparison module 32, first switch module 34 and second switch module 35, comparison module 32 is attempted by the two ends of a light emitting diode (first light emitting diode 21 as shown in Figure 4), be used for judging the duty of first light emitting diode 21, when 21 work of first light emitting diode are undesired, generate control signal by the voltage drop that detects first light emitting diode, 21 two ends; First switch module 34 is connected in series with a light emitting diode (first light emitting diode 21 as shown in Figure 4), and be connected with comparison module 32, be used to receive the control signal that comparison module 32 sends, according to control signal the circuit of first light emitting diode 21 is disconnected, first light emitting diode of lighting originally 21 is extinguished; Second switch module 35 is connected in series with another light emitting diode (second light emitting diode 22 as shown in Figure 4), and be connected with comparison module 32, be used to receive the control signal that comparison module 32 sends, make the line conduction of second light emitting diode 22 according to control signal, second light emitting diode 22 that extinguished is originally lighted.Drive circuit 5 is connected in series with light emitting diode group 2, is used to drive the light emitting diode group.Light emitting diode is white light-emitting diode or colorful light-emitting diode.
The course of work of present embodiment back light source in LED is: if a light emitting diode in the light emitting diode group 2 (for example first light emitting diode 21) operate as normal, first light emitting diode, 21 two ends have a basicly stable voltage drop, therefore the voltage drop of comparison module 32 detections in the control device 3 does not change yet, be that voltage drop numerical value and the present voltage drop numerical value that detects constantly that comparison module 32 previous moment detect does not change, comparison module 32 does not have control signal to generate, therefore first switch module 34 and second switch module 35 keep set condition, promptly first switch module 34 is in conducting state, first light emitting diode 21 is lighted, second switch module 35 is in off-state, and second light emitting diode 22 extinguishes.If first light emitting diode 21 breaks down, the voltage drop at first light emitting diode, 21 two ends will reduce gradually, comparison module 32 detect behind the lower voltage drop numerical value with the voltage drop numeric ratio of previous moment, when the difference of the two surpasses setting value, 32 of comparison modules produce control signal, as a high level signal, send to first switch module 34 and second switch module 35; After first switch module 34 receives high level signal, change off-state immediately into, the circuit of first light emitting diode 21 is disconnected, first light emitting diode 21 extinguishes; After second switch module 35 receives high level signal, change conducting state immediately into, the circuit of second light emitting diode 22 is connected, second light emitting diode 22 is lighted.So just finished the replacement of light emitting diode in the back light source in LED smoothly, not only guaranteed the normal use of back light source in LED, and guaranteed the brightness and the uniformity of back light source in LED.
Fig. 5 is the structural representation of the utility model back light source in LED the 4th embodiment.As shown in Figure 5, the agent structure of present embodiment back light source in LED comprises base plate 1, drive circuit 5, light emitting diode group and control device, the light emitting diode group is fixed on the base plate 1, comprise first light emitting diode string and second light emitting diode string, each light emitting diode string comprises the light emitting diode that several are connected successively; Drive circuit 5 is connected with the light emitting diode group, is used to drive the work of light emitting diode group; Control device comprises comparison module 32, first switch module 34 and second switch module 35, comparison module 32 is attempted by the two ends of a light emitting diode string, be used for judging its duty, generate control signal when this light emitting diode string work undesired (voltage drop is less) by the voltage drop that detects this light emitting diode string; First switch module 34 is connected in series with a light emitting diode string, second switch module 35 is connected in series with another light emitting diode string, and first switch module 34 is connected with comparison module 32 with second switch module 35, be used to receive the control signal that comparison module 32 sends, according to control signal the circuit of the light emitting diode string of lighting is originally disconnected, this light emitting diode string is extinguished, made the line conduction of the light emitting diode string of extinguishing originally, this light emitting diode string is lighted.
The agent structure of present embodiment back light source in LED and aforementioned the 3rd embodiment are basic identical, and different is, present embodiment light emitting diode group comprises two light emitting diode string, and each light emitting diode string comprises the light emitting diode that several are connected successively.The structure of present embodiment control device is identical with aforementioned first embodiment, and the course of work is also basic identical with aforementioned first embodiment, when any one light emitting diode work is undesired in the light emitting diode string, promptly carries out the replacement of light emitting diode string.
It should be noted that at last: above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the spirit and scope of technical solutions of the utility model.
Claims (9)
1. back light source in LED, comprise base plate, it is characterized in that, described base plate is provided with light emitting diode group, control device and optical sensing means, and described light emitting diode group is connected with the control device of lighting according to the optical signal control light emitting diode group light emitting diode that receives or extinguish with the optical sensing means that is used for receiving optical signals.
2. back light source in LED according to claim 1 is characterized in that, described light emitting diode group comprises two light emitting diodes or two light emitting diode string, and each light emitting diode string comprises the light emitting diode that several are connected in series successively.
3. back light source in LED according to claim 1 and 2, it is characterized in that, described control device comprises modular converter, comparison module and switch module, receiving optical signals and the modular converter that optical signal is converted to voltage signal are connected with optical sensing means, receive voltage signal and be connected with modular converter, control light emitting diode or the light emitting diode string extinguished originally according to control signal and light according to the comparison module that relatively generates control signal of voltage signal, originally the switch module that light emitting diode of lighting or light emitting diode string are extinguished is connected with the light emitting diode group.
4. according to claim 1 or the described back light source in LED of 2 claims, it is characterized in that described optical sensing means is arranged on the top of described base plate, the left side of base plate, the right side of base plate or the middle part of base plate.
5. back light source in LED according to claim 2 is characterized in that, described light emitting diode is white light-emitting diode or colorful light-emitting diode.
6. a back light source in LED comprises base plate, it is characterized in that, described base plate is provided with light emitting diode group and control device, and light emitting diode is lighted or the control device that extinguishes is connected with described light emitting diode group in the control light emitting diode group.
7. back light source in LED according to claim 6 is characterized in that, described light emitting diode group comprises two light emitting diodes or two light emitting diode string, and each light emitting diode string comprises the light emitting diode that several are connected in series successively.
8. according to claim 6 or 7 described back light source in LED, it is characterized in that, described control device comprises comparison module, first switch module and second switch module, be attempted by the two ends of a light emitting diode or light emitting diode string according to the comparison module of detected voltage drop generation control signal, described first switch module is connected in series with a light emitting diode or light emitting diode string, described second switch module is connected in series with another light emitting diode or light emitting diode string, receives described control signal and control light emitting diode or the light emitting diode string lighted are originally extinguished, first switch module that light emitting diode that control was extinguished originally or light emitting diode string are lighted is connected with described comparison module with the second switch module.
9. back light source in LED according to claim 7 is characterized in that, described light emitting diode is white light-emitting diode or colorful light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201246649U CN201310785Y (en) | 2008-12-16 | 2008-12-16 | Light emitting diode backlight source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201246649U CN201310785Y (en) | 2008-12-16 | 2008-12-16 | Light emitting diode backlight source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201310785Y true CN201310785Y (en) | 2009-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201246649U Expired - Lifetime CN201310785Y (en) | 2008-12-16 | 2008-12-16 | Light emitting diode backlight source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201310785Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017026A (en) * | 2012-11-29 | 2013-04-03 | 杨夏芳 | LED shadowless lamp system with failure detection and repair functions |
-
2008
- 2008-12-16 CN CNU2008201246649U patent/CN201310785Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103017026A (en) * | 2012-11-29 | 2013-04-03 | 杨夏芳 | LED shadowless lamp system with failure detection and repair functions |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090916 |
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| CX01 | Expiry of patent term |