CN204130145U - A kind of adjusting gear of backlight drive electric current - Google Patents
A kind of adjusting gear of backlight drive electric current Download PDFInfo
- Publication number
- CN204130145U CN204130145U CN201420589724.XU CN201420589724U CN204130145U CN 204130145 U CN204130145 U CN 204130145U CN 201420589724 U CN201420589724 U CN 201420589724U CN 204130145 U CN204130145 U CN 204130145U
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- pwm
- backlight drive
- port
- comparer
- current
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Abstract
The utility model provides a kind of adjusting gear of backlight drive electric current, comprise current constant control integrated circuit, comprise backlight drive matrix current adjustment circuit, described backlight drive matrix current adjustment circuit comprises PWM comparer, integrating circuit, PWM controller, described integrating circuit one end connection PWM comparer is held in the same way, connectivity port, one end REF, external 1 electric capacity of port REF, electric capacity other end ground connection; Described PWM controller one end connects PWM comparer backward end, connectivity port, one end ISET; The output terminal of PWM comparer is connected to the I/O port of IC interior logic control element.By changing the maximal value of the dutycycle adjustment sawtooth signal inputing to the pwm signal of port ISET, and then change backlight drive electric current.
Description
Technical field
The utility model relates to lcd technology, is specifically related to a kind of adjusting gear of backlight drive electric current.
Background technology
Current, LED-backlit LCD TV has become the main flow of household electrical appliances market flat panel TV.The LED-backlit LCD TV backlight drive current parameter of same or similar dimensions is not quite similar, and same model movement configures the drive current that different back light units needs to adjust according to actual techniques state backlight.
Can realize adjusting the effect of backlight drive by changing hardware parameter on movement, but this mode is difficult to the standardization demand meeting movement design and production.Need propose a kind of newly LED-backlit drive current mode is set.
Utility model content
The utility model object is: the adjusting gear providing a kind of backlight drive electric current, realizes arranging LED-backlit drive current size by software control.
The technical solution of the utility model is: a kind of adjusting gear of backlight drive electric current, comprise current constant control integrated circuit, comprise backlight drive matrix current adjustment circuit, described backlight drive matrix current adjustment circuit comprises PWM comparer, integrating circuit, PWM controller, described integrating circuit one end connection PWM comparer is held in the same way, connectivity port, one end REF, external 1 electric capacity of port REF, electric capacity other end ground connection; Described PWM controller one end connects PWM comparer backward end, connectivity port, one end ISET; The output terminal of PWM comparer is connected to the I/O port of IC interior logic control element.
A kind of backlight drive current adjusting method utilizing this device to realize, pwm signal inputs to port ISET, carry out after level translation process through inner PWM controller, transport to PWM comparer backward end, the integrating circuit generation sawtooth signal synchronous with pwm signal is transported to PWM comparer and is held in the same way, after the effect of PWM comparer, the maximal value of sawtooth signal is supplied to the I/O port of IC interior logic control element;
Backlight drive electric current I E numerical value is:
Wherein, VREF is the fixed reference potential that IC interior is arranged, and described fixed reference potential acts on resistance RF, and RF is sample resistance resistance, and D is the dutycycle of the pwm signal that port ISET inputs;
By changing the maximal value of the dutycycle adjustment sawtooth signal inputing to the pwm signal of port ISET, and then change backlight drive electric current.
The beneficial effects of the utility model are: in current constant control integrated circuit, increase by 2 external-connected port ISET and REF, port REF external capacitor setting reference voltage, control signal PWM inputs to port ISET, changes LED-backlit drive current by changing the dutycycle of pwm signal.Realize the object of software adjustment electric current, by software change backlight specifications parameter, greatly reduce the hardware class of product, the great facility that production and application for product bring.
Accompanying drawing explanation
Accompanying drawing 1:OB3350 type single channel current constant control integrated circuit schematic;
Accompanying drawing 2:OB3350 type single channel constant-current supply pwm chip internal frame diagram;
Accompanying drawing 3: modified single channel constant-current supply pwm chip internal frame diagram.
Embodiment
As shown in Figure 2, traditional this IC interior in back facet current mode that arranges arranges fixed reference potential VREF.Traditional mode arranging back facet current IE is the resistance of adjustment sample resistance RF, that is:
Wherein, VREF arranges fixed reference potential for this IC interior, and this voltage acts on resistance RF, and RF is sample resistance resistance.
Traditional back facet current mode that arranges is the adjustment realizing drive current by changing hardware element, from design and the production aspect of product, movement versatility can be caused to be deteriorated, and increases buying and production material management and control workload.
Therefore, be necessary to consider to adopt alternate manner, element material need not be changed and realize adjusting backlight drive electric current.
As shown in Figure 1,3, wherein U1 is the adjusting gear of the utility model backlight drive electric current, and dotted line is with upper part for traditional current constant control integrated circuit, and dotted line take lower part as control section newly-increased after adopting the utility model method.Newly-increased control section comprises backlight drive matrix current adjustment circuit, described backlight drive matrix current adjustment circuit comprises PWM comparer, integrating circuit, PWM controller, described integrating circuit one end connection PWM comparer is held in the same way, connectivity port, one end REF, external 1 electric capacity of port REF, electric capacity other end ground connection, it is relevant that size and the sawtooth wave of this electric capacity change slope, adjustment capacitance size, the slope that sawtooth waveform rises is set to 45 °, to ensure that tooth waveform keeps corresponding relation on time and amplitude; Described PWM controller one end connects PWM comparer backward end, connectivity port, one end ISET; The output terminal of PWM comparer is connected to the I/O port of IC interior logic control element.Pwm signal inputs to port ISET, carry out after level translation process through inner PWM controller, transport to PWM comparer backward end, the integrating circuit generation sawtooth signal synchronous with pwm signal is transported to PWM comparer and is held in the same way, after the effect of PWM comparer, the maximal value of sawtooth signal is supplied to the I/O port of IC interior logic control element.By changing the maximal value of the dutycycle adjustment sawtooth signal inputing to the pwm signal of port ISET, and then change backlight drive electric current.
Set the dutycycle of the pwm signal inputing to port ISET as D in the utility model, back facet current numerical value is:
Wherein, VREF arranges fixed reference potential for this IC interior, and this voltage acts on resistance RF, and RF is sample resistance resistance, and D is the pwm signal dutycycle that port ISET inputs.
Finally, the dutycycle completing the pwm signal be carried on port ISET by the software simulating adjustment of MCU completes the work arranged LED-backlit electric current.That is: by the reconfigurable LED-backlit size of current of adjustment software parameter.
Claims (1)
1. the adjusting gear of a backlight drive electric current, comprise current constant control integrated circuit, it is characterized in that: comprise backlight drive matrix current adjustment circuit, described backlight drive matrix current adjustment circuit comprises PWM comparer, integrating circuit, PWM controller, described integrating circuit one end connection PWM comparer is held in the same way, connectivity port, one end REF, external 1 electric capacity of port REF, electric capacity other end ground connection; Described PWM controller one end connects PWM comparer backward end, connectivity port, one end ISET; The output terminal of PWM comparer is connected to the I/O port of IC interior logic control element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420589724.XU CN204130145U (en) | 2014-10-11 | 2014-10-11 | A kind of adjusting gear of backlight drive electric current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420589724.XU CN204130145U (en) | 2014-10-11 | 2014-10-11 | A kind of adjusting gear of backlight drive electric current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204130145U true CN204130145U (en) | 2015-01-28 |
Family
ID=52386477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420589724.XU Expired - Fee Related CN204130145U (en) | 2014-10-11 | 2014-10-11 | A kind of adjusting gear of backlight drive electric current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204130145U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104282280A (en) * | 2014-10-11 | 2015-01-14 | 南京熊猫电子股份有限公司 | Backlight drive current adjusting device and method thereof |
-
2014
- 2014-10-11 CN CN201420589724.XU patent/CN204130145U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104282280A (en) * | 2014-10-11 | 2015-01-14 | 南京熊猫电子股份有限公司 | Backlight drive current adjusting device and method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20161011 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |