CN105141864A - LED television circuit - Google Patents
LED television circuit Download PDFInfo
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- CN105141864A CN105141864A CN201510460142.0A CN201510460142A CN105141864A CN 105141864 A CN105141864 A CN 105141864A CN 201510460142 A CN201510460142 A CN 201510460142A CN 105141864 A CN105141864 A CN 105141864A
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Abstract
The invention discloses an LED television circuit. The LED television circuit comprises a display module, a control module, a power module and a backlight module; the display module is used for displaying videos; the backlight module is used for providing backlight for the display module; the control module is used for controlling the work of the display module and the backlight module; the power module is used for providing AC/DC power; the backlight module comprises red LED lamps, green LED lamps, blue LED lamps and driving chips of corresponding colors; each driving chip drives a group of LED lamps of the same color and each signal output pin of the driving chip is connected with one LED lamp, wherein a current-limiting resistor is connected in series between the red LED lamps and a power source; the three driving chips are orderly connected in series; a fixed-value resistor and an adjustable resistor are connected in series between the constant-current driving pin of each driving chip and a signal ground. The LED television circuit achieves an effective compensation effect on the display module of an LED television.
Description
Technical field
The invention belongs to household appliance technical field, be specifically related to a kind of LED television circuit.
Background technology
The strict title of so-called LED television is " LED backlight LCD TV ", refer to the LCD TV using LED as backlight, proper LED television refers to the television set adopting LED (light-emitting diode) as picture device completely, namely adopt a kind of super-high density of LED display design to have the display applications product of TV functions, size is unrestricted.It instead of traditional fluorescent tube with LED light source.LED television has picture more high-quality, and the theoretical life-span is longer, more energy-conservation, and manufacture craft is environmental protection more, can make outstanding advantage such as display panels thinner grade, but also the LED television of not all possesses above advantage,
LED does backlight, and comparing CCFL has many advantages:
Energy-conservation: the photoelectric efficiency of cold cathode fluorescent lamp is at about 60lm/W, and business-like LED light effect has reached more than 100lm/W; Environmental protection more; CCFL can use toxic material in manufacturing makes TV more slim; LED-backlit changes TV backlight Design of Mechanical Structure, significantly can reduce the thickness of light guide plate in traditional backlight source, makes LED-backlit TV more slim.Mobile phone backlight can use 4-5 LEDs usually, and notebook computer LED-backlit on average needs 45 LEDs; A LED television on average needs 500 LEDs.LED-backlit has had certain infiltration in small-medium size display screen.In mobile phone application, 100% is all use LED-backlit; DisplaySearch estimates that LED-backlit in 2009 will reach 52% in the permeability of notebook computer, simultaneously in 2010 also by Fast Growth to 81%.LED-backlit just starts in the infiltration in LCD TV field, but means a great.
Liquid crystal must be luminous by extra light source ability.The backlight that LCD TV is conventional has CCFL (cathode fluorescent tube, namely we common fluorescent lamp), LED (light-emitting diode), HCFL (thermal cathode fluorescent tube) etc. several.Wherein CCFL is LCD backlight the most frequently used at present, usually also claims traditional backlight source.
Therefore, if divide the kind of LCD TV according to the type of backlight, namely can be divided into:
CCFL backlight LCD (also namely usually so-called " traditional liquid crystal TV ", " LCD ");
LED backlight LCD (also namely usually so-called " LED television ");
HCFL backlight LCD (be suitable for large-size TV, 66 inches of products can be applied to, be less on the market).
At the backlight that traditional liquid crystal TV uses--in CCFL cold-cathode fluorescence lamp, containing harmful mercury.Although manufacturer is reducing the content of mercury in fluorescent tube by every means, completely can with serving new technical problem without the fluorescent tube of mercury.And LED backlight is never mercurous, meet the fashion of environmental protection.LED backlight is also economized on electricity very much.LED internal voltage driver is far below CCFL, and power consumption and fail safe are all better than CCFL.
But the adjustment of LED-backlit exists certain difficulty, therefore, be badly in need of a kind of backlight regulating circuit of LED television.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of LED television circuit, solves LED television backlight in prior art and regulates difficult problem.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of LED television circuit, comprise display module, control module, power module, backlight module, described display module is used for video display, described backlight module is used for providing backlight for display module, described control module is for controlling display module, the work of backlight module, described power module is used for providing power of alterating and direct current, described backlight module comprises red LED lamp, green LED lamp, the driving chip of blue led lamp and corresponding color, each driving chip drives the LED of one group of same color, each signal output pin of driving chip is respectively connected with a LED, wherein, to connect between red LED lamp with power supply a current-limiting resistance, three driving chip are sequentially connected in series, the constant current of described each driving chip drives pin and a fixed value resistance and the adjustable resistance of connecting between signal ground.
Each driving chip includes 8 or 16 drive singal output pins, 3 control signal pin, 1 data-signal input pin, 1 data-signal output pin, wherein, 3 control signal pin are respectively sheet and select input pin, latch signal pin, clock signal pin, wherein, the data-signal input pin of three driving chip, output pin are sequentially connected in series.
The resistance of described current-limiting resistance is 50 Europe, Europe ~ 100.
Described driving chip is MBI5024 or MBI5167 that scientific & technical corporation is built up in Taiwan.
Described LED is paster LED lamp.
Described display module is LCD liquid crystal display screen.
Compared with prior art, the present invention has following beneficial effect:
1, be connected with an adjustable resistance by a fixed value resistance, first determine a fixed value resistance, then regulate adjustable resistance, like this, the range shorter of adjustment, serves the effect of effective compensation to the display module of LED television.
2, by a resistance of connecting in red LED lamp set, effectively play the effect of dividing potential drop, reduce the impact to red LED lamp, increase useful life, effectively reduce the generation of dead point rate.
The resistance of 3, connecting between 50 Europe, Europe ~ 100, effectively can play the effect of dividing potential drop, does not affect the brightness of normal red LED lamp simultaneously.
4, MBI5024 chip is that a performance that accumulation science and technology in Taiwan controls to release for LED display is specially high, the chip that cost is low, and the LED display control for the type can realize its display demand, reduces the cost of whole screen simultaneously.
Accompanying drawing explanation
Fig. 1 is backlight module circuit diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, structure of the present invention and the course of work are described further.
As shown in Figure 1, a kind of LED television circuit, comprise display module, control module, power module, backlight module, described display module is used for video display, described backlight module is used for providing backlight for display module, described control module is for controlling display module, the work of backlight module, described power module is used for providing power of alterating and direct current, described backlight module comprises red LED lamp, green LED lamp, the driving chip of blue led lamp and corresponding color, each driving chip drives the LED of one group of same color, each signal output pin of driving chip is respectively connected with a LED, wherein, to connect between red LED lamp with power supply a current-limiting resistance, three driving chip are sequentially connected in series, the constant current of described each driving chip drives pin and a fixed value resistance and the adjustable resistance of connecting between signal ground.Wherein, R1, R2 are current-limiting resistance, and R3, R4, R5 are fixed value resistance, and R6, R7, R8 are adjustable resistance, and C1 to C3 is filter capacitor, and L1 to L5 is magnetic bead, for filtering.
Each driving chip includes 8 or 16 drive singal output pins, 3 control signal pin, 1 data-signal input pin IN, 1 data-signal output pin OUT, wherein, 3 control signal pin are respectively sheet and select input pin OE, latch signal pin LE, clock signal pin CLK, wherein, the data-signal input pin of three driving chip, output pin are sequentially connected in series.
The resistance of described current-limiting resistance is 50 Europe, Europe ~ 100.
Described driving chip is MBI5024 or MBI5167 that scientific & technical corporation is built up in Taiwan.
Described LED is paster LED lamp.
Described display module is LCD liquid crystal display screen.
MBI5024 chip has following features:
MBI5024 utilizes up-to-date PrecisionDrive technology, and aim at the drive IC of LED display panel design, the CMOS bit shift register that it is built-in and bolt-lock function, can convert the input data of serial to parallel output data formats.
The input voltage range value of MBI5024 is 3.3 volts to 5 volts, provides 16 current sources, 3-45mA can be provided to determine the magnitude of current with driving LED in each output stage; And in single IC the current difference of output channel be less than ± 3%; Output current difference between many IC is less than ± and 6%; Electric current, along with output withstand voltage (VDS) change, is controlled in every volt 0.1%; And electric current is subject to service voltage (VDD), the change of ambient temperature is also controlled in 1%.User can via selecting the RSET of different resistance to adjust the size of current of each output stage of MBI5024, by this mechanism, and user can the luminosity of accurately control LED.
The design of MBI5024 ensures that its output stage can be withstand voltage 17 volts, therefore can be connected in series multiple LED at each output.
In addition, MBI5024 also provides the high clock frequency of 25MHz to meet system to the demand in mass data transmission.
Control element on LED display adopts MBI5024 control chip, MBI5024 chip is that a performance that accumulation science and technology in Taiwan controls to release for LED display is specially high, the chip that cost is low, LED display for the type controls to realize its display demand, reduces the cost of whole screen simultaneously.
The pin of MBI5024 is described as follows table:
This chip main lift display screen uniformity of MBI5024, and tolerate that larger LED luminance difference is to reduce manufacturing cost, simultaneously because current accuracy improves, larger LED luminance error can be tolerated, contribute to manufacturer and reduce LED purchase cost.
Claims (6)
1. a LED television circuit, comprise display module, control module, power module, backlight module, described display module is used for video display, described backlight module is used for providing backlight for display module, described control module is for controlling display module, the work of backlight module, described power module is used for providing power of alterating and direct current, it is characterized in that: described backlight module comprises red LED lamp, green LED lamp, the driving chip of blue led lamp and corresponding color, each driving chip drives the LED of one group of same color, each signal output pin of driving chip is respectively connected with a LED, wherein, to connect between red LED lamp with power supply a current-limiting resistance, three driving chip are sequentially connected in series, the constant current of described each driving chip drives pin and a fixed value resistance and the adjustable resistance of connecting between signal ground.
2. LED television circuit according to claim 1, it is characterized in that: each driving chip includes 8 or 16 drive singal output pins, 3 control signal pin, 1 data-signal input pin, 1 data-signal output pin, wherein, 3 control signal pin are respectively sheet and select input pin, latch signal pin, clock signal pin, wherein, the data-signal input pin of three driving chip, output pin are sequentially connected in series.
3. LED television circuit according to claim 1, is characterized in that: the resistance of described current-limiting resistance is 50 Europe, Europe ~ 100.
4. LED television circuit according to claim 1, is characterized in that: described driving chip is MBI5024 or MBI5167 that scientific & technical corporation is built up in Taiwan.
5. LED television circuit according to claim 1, is characterized in that: described LED is paster LED lamp.
6. LED television circuit according to claim 1, is characterized in that: described display module is LCD liquid crystal display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510460142.0A CN105141864A (en) | 2015-07-31 | 2015-07-31 | LED television circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510460142.0A CN105141864A (en) | 2015-07-31 | 2015-07-31 | LED television circuit |
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| Publication Number | Publication Date |
|---|---|
| CN105141864A true CN105141864A (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510460142.0A Pending CN105141864A (en) | 2015-07-31 | 2015-07-31 | LED television circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109584735A (en) * | 2018-12-29 | 2019-04-05 | 苏州工业园区客临和鑫电器有限公司 | A kind of LED multifunctional panel lamp |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103325356A (en) * | 2013-06-21 | 2013-09-25 | 合肥京东方光电科技有限公司 | Voltage regulation circuit of common electrode and display device |
| CN104347032A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | Driving circuit of outdoor LED (Light Emitting Diode) display screen |
| CN104347033A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | LED (Light-Emitting Diode) display screen driving circuit |
| CN104347034A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | Double-power LED (light-emitting diode) display screen drive circuit |
-
2015
- 2015-07-31 CN CN201510460142.0A patent/CN105141864A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103325356A (en) * | 2013-06-21 | 2013-09-25 | 合肥京东方光电科技有限公司 | Voltage regulation circuit of common electrode and display device |
| CN104347032A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | Driving circuit of outdoor LED (Light Emitting Diode) display screen |
| CN104347033A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | LED (Light-Emitting Diode) display screen driving circuit |
| CN104347034A (en) * | 2014-11-20 | 2015-02-11 | 无锡科思电子科技有限公司 | Double-power LED (light-emitting diode) display screen drive circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109584735A (en) * | 2018-12-29 | 2019-04-05 | 苏州工业园区客临和鑫电器有限公司 | A kind of LED multifunctional panel lamp |
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Application publication date: 20151209 |
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| RJ01 | Rejection of invention patent application after publication |