CN105022220A - Backlight brightness adjustment circuit of projector - Google Patents
Backlight brightness adjustment circuit of projector Download PDFInfo
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- CN105022220A CN105022220A CN201510459697.3A CN201510459697A CN105022220A CN 105022220 A CN105022220 A CN 105022220A CN 201510459697 A CN201510459697 A CN 201510459697A CN 105022220 A CN105022220 A CN 105022220A
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Abstract
The invention discloses a backlight brightness adjustment circuit of a projector. The backlight brightness adjustment circuit comprises a light output module, a backlight module and a backlight brightness adjustment module, wherein the light output module is used for outputting light energy of video information, the backlight module is used for providing auxiliary backlight for the light output module, the backlight brightness module is used for adjusting the output brightness of the backlight module according to the light energy output from the light output module, and comprises LED lamps and driving chips, and a fixed resistor and an adjustable resistor are connected in series between a constant-current driving pin of each driving chip and a signal ground. By the backlight brightness adjustment circuit of the projector, the backlight brightness can be automatically adjusted according to the output intensity of the light output module, and an effective compensation effect is achieved.
Description
Technical field
The invention belongs to electronics applications field, be specifically related to a kind of projector backlight illumination regulating circuit.
Background technology
Projector is also known as projector, by image or VIDEO PROJECTION or the equipment that reflexes on screen by digital light treatment technology or LCD liquid crystal imaging technology, can, by different signal sources, as computing machine, mobile phone, DVD, DV access corresponding image and vision signal, realize playing.Projector is widely used in the places such as education, commercial affairs, engineering, family expenses.Projector, according to principle of work, is mainly divided into the types such as DLP, LCD.
DLP is the abbreviation of " Digital Light Procession ", is digital light process imaging technique.Be exactly signal of video signal through digital processing in brief, and then light is projected.It is based on TI(Texas Instruments) digital micromirror elements---the DMD(Digital Micromirror Device of company's exploitation) carry out the technology of viewable numbers information displaying.Its principle is by by UHP bulb, the cold light source that LED light source or laser hybrid light source are launched is by condensation lens, by Rod (optical wand) by light uniformization, light is after treatment by a colour wheel (Color Wheel), light is divided into RGB tri-look, thus realizes the picture rich in detail of rediscover color.The advantage of DLP technology is that the color reducibility of high-quality, image definition are high, and picture homogeneity is good, details in a play not acted out on stage, but told through dialogues performance almost Perfect, and good overcomes the problem that in LCD shadow casting technique, LCD liquid crystal board is aging.In projector's Market and Technology, occupy most of market at present.DLP represents manufacturer and is mainly American-European system and platform system, as ViewSonic of U.S. ViewSonic, EPSON, Benq, beautiful news etc.
LCD projector is divided into liquid crystal board and liquid crystal light valve two kinds.Liquid crystal is the material between liquid and solid, and itself is not luminous, and job specification temperature influence is very large, and its working temperature is-55 & ordm; C ~+77 & ordm; C.Projector utilizes the photoelectric effect of liquid crystal, namely liquid crystal molecule be arranged in electric field action under change, affecting transmittance or the reflectivity of its liquid crystal cells, from affecting its optical property during machine, producing the image with different gray-level and color.The principle of Liang Zhong LCD projector is described below respectively.
The light output module of projector is the important indicator determining projector quality, and light output refers to that the luminous energy that projector exports, unit are ' lumen ' (lm).A physical quantity relevant with light output is brightness, refers to that screen surface is subject to the ratio that luminous energy and the screen area sent is penetrated in illumination, and the unit that brightness is commonly used is ' lux ' (lx, 1lx=1lm/m2).The light exported when projector passes through a timing, and the larger brightness of projected area is lower, otherwise then brightness is higher.Determine that projector light exports because have projection and video screen area, performance and lens performance, usually video screen area greatly, light output is large.Projector lens performance with fluid coupling camera lens is good, and projector light exports and also can correspondingly improve.
Therefore, those skilled in the art are seeking the method or the system that solve projector light Drazin inverse always, but all neither one breakthroughs, make still to be in a relatively weak link in light output module.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of projector backlight illumination regulating circuit, solves the problem that in prior art, light output module difficulty regulates.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of projector backlight illumination regulating circuit, comprise light output module, backlight module and backlight illumination adjustment module, wherein, light output module is used for the luminous energy of video information to export, backlight module is used for providing auxiliary backlight for light output module, the luminous energy that backlight illumination adjustment module is used for exporting according to light output module regulates the output brightness of backlight module, described backlight illumination adjustment module comprises LED, driving chip, described LED comprises three groups, be respectively red LED lamp, green LED lamp, blue led lamp, described driving chip comprises three, 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.
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 regulated, according to the automatic adjusting backlight luminance of the output intensity of light output module, can serve the effect of effective compensation.
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 serviceable 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 that backlight illumination of the present invention regulates driving circuit figure.
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 projector backlight illumination regulating circuit, comprise light output module, backlight module and backlight illumination adjustment module, wherein, light output module is used for the luminous energy of video information to export, backlight module is used for providing auxiliary backlight for light output module, the luminous energy that backlight illumination adjustment module is used for exporting according to light output module regulates the output brightness of backlight module, described backlight illumination adjustment module comprises LED, driving chip, described LED comprises three groups, be respectively red LED lamp, green LED lamp, blue led lamp, described driving chip comprises three, be respectively IC1 to IC3, 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.
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, 3-45 mA 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 terminal withstand voltage (VDS) change, is controlled in every volt 0.1%; And electric current is subject to service voltage (VDD), the change of environment 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 terminal.
In addition, MBI5024 also provides the high clock frequency of 25MHz to meet system to the demand in mass data transmission.
Control element in 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 coefficient 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 (5)
1. a projector backlight illumination regulating circuit, it is characterized in that: comprise light output module, backlight module and backlight illumination adjustment module, wherein, light output module is used for the luminous energy of video information to export, backlight module is used for providing auxiliary backlight for light output module, the luminous energy that backlight illumination adjustment module is used for exporting according to light output module regulates the output brightness of backlight module, described backlight illumination adjustment module comprises LED, driving chip, described LED comprises three groups, be respectively red LED lamp, green LED lamp, blue led lamp, described driving chip comprises three, 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. projector backlight illumination regulating 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. projector backlight illumination regulating circuit according to claim 1, is characterized in that: the resistance of described current-limiting resistance is 50 Europe, Europe ~ 100.
4. projector backlight illumination regulating 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. projector backlight illumination regulating circuit according to claim 1, is characterized in that: described LED is paster LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510459697.3A CN105022220A (en) | 2015-07-31 | 2015-07-31 | Backlight brightness adjustment circuit of projector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510459697.3A CN105022220A (en) | 2015-07-31 | 2015-07-31 | Backlight brightness adjustment circuit of projector |
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| CN105022220A true CN105022220A (en) | 2015-11-04 |
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| CN201510459697.3A Withdrawn CN105022220A (en) | 2015-07-31 | 2015-07-31 | Backlight brightness adjustment circuit of projector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114187882A (en) * | 2021-11-24 | 2022-03-15 | 当趣网络科技(杭州)有限公司 | System and method for adjusting brightness of display screen of projector |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08114801A (en) * | 1994-10-14 | 1996-05-07 | Hasegawa Electric Co Ltd | Liquid crystal display device |
| CN2924284Y (en) * | 2006-04-03 | 2007-07-18 | 宏波半导体有限公司 | Colour temperature adjustable high-brightness LEd desk lamp |
| CN101393724A (en) * | 2007-09-17 | 2009-03-25 | 美格纳半导体有限会社 | Image display device and method capable of adjusting brightness |
| CN201557284U (en) * | 2009-11-30 | 2010-08-18 | 康佳集团股份有限公司 | LED constant flow driving circuit device |
| CN201608947U (en) * | 2010-02-24 | 2010-10-13 | 青岛海信电器股份有限公司 | LED display device and LED backlight source driving system thereof |
| CN201689269U (en) * | 2010-05-31 | 2010-12-29 | 江西广天视科技有限公司 | Projector with colored light source |
| CN103594058A (en) * | 2013-12-02 | 2014-02-19 | 广东威创视讯科技股份有限公司 | Drive circuit for 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 |
| CN204883151U (en) * | 2015-07-31 | 2015-12-16 | 苏州市英富美欣科技有限公司 | Projecting apparatus adjustting of lighteness circuit that is shaded |
-
2015
- 2015-07-31 CN CN201510459697.3A patent/CN105022220A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08114801A (en) * | 1994-10-14 | 1996-05-07 | Hasegawa Electric Co Ltd | Liquid crystal display device |
| CN2924284Y (en) * | 2006-04-03 | 2007-07-18 | 宏波半导体有限公司 | Colour temperature adjustable high-brightness LEd desk lamp |
| CN101393724A (en) * | 2007-09-17 | 2009-03-25 | 美格纳半导体有限会社 | Image display device and method capable of adjusting brightness |
| CN201557284U (en) * | 2009-11-30 | 2010-08-18 | 康佳集团股份有限公司 | LED constant flow driving circuit device |
| CN201608947U (en) * | 2010-02-24 | 2010-10-13 | 青岛海信电器股份有限公司 | LED display device and LED backlight source driving system thereof |
| CN201689269U (en) * | 2010-05-31 | 2010-12-29 | 江西广天视科技有限公司 | Projector with colored light source |
| CN103594058A (en) * | 2013-12-02 | 2014-02-19 | 广东威创视讯科技股份有限公司 | Drive circuit for 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 |
| CN204883151U (en) * | 2015-07-31 | 2015-12-16 | 苏州市英富美欣科技有限公司 | Projecting apparatus adjustting of lighteness circuit that is shaded |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114187882A (en) * | 2021-11-24 | 2022-03-15 | 当趣网络科技(杭州)有限公司 | System and method for adjusting brightness of display screen of projector |
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Application publication date: 20151104 |