CN105118426A - LED display screen white balance drive circuit - Google Patents
LED display screen white balance drive circuit Download PDFInfo
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- CN105118426A CN105118426A CN201510460441.4A CN201510460441A CN105118426A CN 105118426 A CN105118426 A CN 105118426A CN 201510460441 A CN201510460441 A CN 201510460441A CN 105118426 A CN105118426 A CN 105118426A
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Abstract
The invention discloses an LED display screen white balance drive circuit. The LED display screen white balance drive circuit comprises driving chips, LED lamps, a current adjusting module, current limiting resistors, and filter circuits. The driving chips include red driving chips, green driving chips and blue driving chips. Each driving chip comprises a plurality of data output pins, a latching pin, a chip selection pin, a data input pin, a clock pin and a proportional current adjusting pin. Each proportional current adjusting pin is connected with one end of a current adjusting series circuit. All the proportional current adjusting pins of the same-color driving chips are connected with the same current adjusting series circuit. The filter circuits include power supply filter circuits and signal filter circuits. By adopting a three-grade capacity value filtering means, the drive circuit can make the interference of each frequency band effectively filtered. By adopting magnetic beads serially connected to signal input output ends, the drive circuit effectively filters crosstalk. Signal integrity is further guaranteed.
Description
Technical field
The invention belongs to electronics applications field, be specifically related to a kind of LED display white balance driving circuit.
Background technology
White balance effect is one of most important index of display screen.Color science is taken in when the ratio of red green blue tricolor is 1:4.6:0.16 just can demonstrate pure white, if actual ratio has some deviations, there will be the deviation of white balance, generally will notice whether white has partially blue, inclined yellow green phenomenon.The quality of white balance decides primarily of the control system of display screen, and the reductibility of tube core on color also has impact.
In the brightness of LED display is reconciled, if the ratio of the red green blue tricolor of application 1:4.6:0.16, there will be forward current deviation too large, cause misalignment serious, be not easy the problem regulated, and the LED forward current that LED display often plants color determines life-span and the stability of display screen.
Existing LED display manufacturer regulates white balance, general is all adopt a module to fix, then intrinsic brilliance colourity is measured, according to brightness and chromaticity coordinates value, regulate the current-limiting resistance of RGB three kinds of colors, although this method can get a desired effect, but examination mainly repeatedly, the method that neither one is fixing, when test is to normally when terminating, this method often can do repeated work, sometimes, regulate the time of one piece of module few, sometimes, even regulate to regulate a module a couple of days, then according to the resistance value tested out, by the RGB current-limiting resistance of other modules all according to the specification assembling of debugging, work efficiency is too low.
Application number is 201410378262.1, and the applying date is the method and the device that within 08 month 01 day, provide a kind of LED display white balance adjusting in 2014, belongs to field of LED display.In the invention, preset target brightness value, target X-axis chromaticity coordinates value and target Y-axis chromaticity coordinates value; LED display is regulated according to initial red gain value, initial green yield value and initial blue gain value; Feedback brightness value, feedback X-axis chromaticity coordinates value and feedback Y-axis chromaticity coordinates value are detected; Obtain the difference of its correspondence; When having at least to exceed its ranges of error values interval in difference, obtain target red gain value, target green yield value and target blue gain value according to feedback brightness value, feedback X-axis chromaticity coordinates value and feedback Y-axis chromaticity coordinates value; And regulate LED display, and continue to detect feedback brightness value, feedback X-axis chromaticity coordinates value and feedback Y-axis chromaticity coordinates value.This invention, by the method for described LED display white balance adjusting and device, improves the efficiency of LED display white balance adjusting.
Above-mentioned patent regulates the Measures compare of white balance complicated, needs to calculate for chromaticity coordinates value, and computation process committed memory is comparatively large, and need constantly to regulate, efficiency is low.
Summary of the invention
Technical matters to be solved by this invention is: provide a kind of LED display white balance driving circuit, solve the inefficient problem of white balance adjusting in prior art.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of LED display white balance driving circuit, comprises driving chip, LED, current regulating module, current-limiting resistance, filtering circuit, described LED comprises red LED lamp, green LED lamp, blue led lamp, described driving chip comprises red driving chip, green driving chip, blue driving chip, a red driving chip, a green driving chip, a blue driving chip forms one group, and each driving chip includes multiple data output pin, one is latched pin, a chip select pin, a data input pin, a clock pin, a proportional current regulates pin, each data output pin of red driving chip is all connected a current-limiting resistance, described current regulating module comprises fixed value resistance and adjustable resistance, wherein, a fixed value resistance and an adjustable resistance form a Current adjustment series circuit, each proportional current regulates pin to be all connected with one end of a Current adjustment series circuit, the other end of all Current adjustment series circuits is all connected to ground, the proportion adjustment pin of all same color driving chip is all connected with same Current adjustment series circuit, described filtering circuit comprises electric source filter circuit and signal filter circuit, wherein, electric source filter circuit comprises the different electric capacity of at least three capacitances, signal filter circuit comprises magnetic bead, the input end of each control signal is all connected a magnetic bead, each group data input pin of driving chip and data output end are respectively connected a magnetic bead.
In described three electric capacity, capacitance difference is between any two at least two orders of magnitude.
The capacitance of described three electric capacity is respectively 10uF, 0.1uF, 0.001uF.
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.
The wavelength of described red light is 625nm, the wavelength of green light is 525nm, the wavelength of blue lamp is 470nm.
The brightness of described red light is 900mcd, the brightness of green light is 1800mcd, the brightness of blue lamp is 300mcd.
Colour temperature during described LED display white balance is 6500K.
Compared with prior art, the present invention has following beneficial effect:
1, pin is regulated to be connected with same Current adjustment series circuit the proportional current of same color driving chip, each adjustment can by the brightness regulation of the same color of whole module, brightness value required for quick obtaining display screen three kinds of colors, the white balance of the whole LED display of effective adjustment, reliability is high, and accuracy is high.
2, according to chromaticity coordinates parameter, carry out entirety fine setting to three colors, make brightness and white balance more close to the value preset, white light color is access expansion look more.
3, 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.Adopt three grades of capacitance filtering, can the interference of effective each frequency range of filtering, adopt magnetic bead to be connected in series to signal input output end, can effectively filtering crosstalk, the integrality of guarantee signal.
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 white balance driving circuit figure of the present invention.
Embodiment
Below structure of the present invention and the course of work are described further.
As shown in Figure 1, a kind of LED display white balance driving circuit, comprises driving chip, LED, current regulating module, current-limiting resistance, filtering circuit, described LED comprises red LED lamp, green LED lamp, blue led lamp, described driving chip comprises red driving chip, green driving chip, blue driving chip, a red driving chip, a green driving chip, a blue driving chip forms one group, and each driving chip includes multiple data output pin, one is latched pin, a chip select pin, a data input pin, a clock pin, a proportional current regulates pin, each data output pin of red driving chip is all connected a current-limiting resistance, described current regulating module comprises fixed value resistance and adjustable resistance, wherein, a fixed value resistance and an adjustable resistance form a Current adjustment series circuit, each proportional current regulates pin to be all connected with one end of a Current adjustment series circuit, the other end of all Current adjustment series circuits is all connected to ground, the proportion adjustment pin of all same color driving chip is all connected with same Current adjustment series circuit, described filtering circuit comprises electric source filter circuit and signal filter circuit, wherein, electric source filter circuit comprises the different electric capacity of at least three capacitances, signal filter circuit comprises magnetic bead, the input end of each control signal is all connected a magnetic bead, each group data input pin of driving chip and data output end are respectively connected a magnetic bead.
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, according to the automatic adjusting backlight luminance of the output intensity of light output module, can serve the effect of effective compensation.Adopt three grades of capacitance filtering, can the interference of effective each frequency range of filtering, adopt magnetic bead to be connected in series to signal input output end, can effectively filtering crosstalk, the integrality of guarantee signal.
In described three electric capacity, capacitance difference is between any two at least two orders of magnitude.
The capacitance of described three electric capacity is respectively 10uF, 0.1uF, 0.001uF.
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.
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.
Described LED is paster LED lamp.
The wavelength of described red light is 625nm, the wavelength of green light is 525nm, the wavelength of blue lamp is 470nm.
The brightness of described red light is 900mcd, the brightness of green light is 1800mcd, the brightness of blue lamp is 300mcd.
Colour temperature during described LED display white balance is 6500K.
Specific embodiment,
Apply the method for a kind of outdoor P20 full-color LED display screen white balance of this circuit conditioning, each pixel of described P20 full-color LED display screen comprises a red light, green light, a blue lamp, and white balance adjusting method comprises the steps:
The luminance parameter of step 1, acquisition LED display red light, green light, blue lamp, the brightness of red light is 900mcd, the brightness of green light is 1800mcd, the brightness of blue lamp is 300mcd, and the wavelength of red light is 625nm, the wavelength of green light is 525nm, the wavelength of blue lamp is 470nm; The high-high brightness of each pixel is 3000mcd, and a square meter comprises 2500 pixels, and therefore, whole screen high-high brightness is 7500cd;
The whole screen luminance parameter that step 2, basis preset, the whole screen high-high brightness preset can not be greater than 7500cd, general with 80% of high-high brightness for established standards, the whole screen brightness that this embodiment presets is 6000cd, the brightness value of red, green, blue, according to the ratio of 3:6:1, calculates the brightness value of required red, green, blue color;
Step 3, the adjustable resistance regulating red driving chip to connect, regulate the current value of whole module red light, and the brightness value of Real-time Obtaining red light, when the real-time luminosity value of red light is greater than the when red angle value calculated in step 2, reduce the electric current flowing through red light, when the real-time luminosity of red light is less than the when red angle value calculated in step 2, increase the current value flowing through red light, until red light real-time luminosity equals the when red angle value calculated;
Step 4, the adjustable resistance regulating green driving chip to connect, regulate the current value of whole module green light, and the brightness value of Real-time Obtaining green light, when the real-time luminosity value of green light is greater than the green light angle value calculated in step 2, reduce the electric current flowing through green light, when the real-time luminosity of green light is less than the green light angle value calculated in step 2, increase the current value flowing through green light, until green light real-time luminosity equals the green light angle value calculated;
Step 5, the adjustable resistance regulating blue driving chip to connect, regulate the current value of the blue lamp of whole module, and the brightness value of the blue lamp of Real-time Obtaining, when the real-time luminosity value of blue lamp is greater than the blue lamp brightness value calculated in step 2, reduce the electric current flowing through blue lamp, when the real-time luminosity of blue lamp is less than the blue lamp brightness value calculated in step 2, increase the current value flowing through blue lamp, until blue lamp real-time luminosity equals the blue lamp brightness value calculated;
The chromaticity coordinates of step 6, acquisition LED display;
Step 7, according to chromaticity coordinates value, regulate and flow through the current value of red, green, blue lamp, until the colourity of LED display reaches the white balance parameter preset.
Colour temperature during described LED display white balance is 6500K.
According to chromaticity coordinates parameter, carry out entirety fine setting to three colors, make brightness and white balance more close to the value preset, white light color is access expansion look more.
The above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And these belong to connotation of the present invention the apparent change of extending out or variation still belong to protection scope of the present invention.
Claims (9)
1. a LED display white balance driving circuit, comprises driving chip, LED, current regulating module, current-limiting resistance, filtering circuit, described LED comprises red LED lamp, green LED lamp, blue led lamp, described driving chip comprises red driving chip, green driving chip, blue driving chip, a red driving chip, a green driving chip, a blue driving chip forms one group, and each driving chip includes multiple data output pin, one is latched pin, a chip select pin, a data input pin, a clock pin, a proportional current regulates pin, each data output pin of red driving chip is all connected a current-limiting resistance, described current regulating module comprises fixed value resistance and adjustable resistance, wherein, a fixed value resistance and an adjustable resistance form a Current adjustment series circuit, each proportional current regulates pin to be all connected with one end of a Current adjustment series circuit, the other end of all Current adjustment series circuits is all connected to ground, it is characterized in that: the proportion adjustment pin of all same color driving chip is all connected with same Current adjustment series circuit, described filtering circuit comprises electric source filter circuit and signal filter circuit, wherein, electric source filter circuit comprises the different electric capacity of at least three capacitances, signal filter circuit comprises magnetic bead, the input end of each control signal is all connected a magnetic bead, each group data input pin of driving chip and data output end are respectively connected a magnetic bead.
2. LED display automatic white balance adjustment driving circuit according to claim 1, is characterized in that: in described three electric capacity, capacitance difference is between any two at least two orders of magnitude.
3. LED display white balance driving circuit according to claim 2, is characterized in that: the capacitance of described three electric capacity is respectively 10uF, 0.1uF, 0.001uF.
4. LED display white balance driving circuit according to claim 1, is characterized in that: the resistance of described current-limiting resistance is 50 Europe, Europe ~ 100.
5. LED display white balance driving 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.
6. LED display white balance driving circuit according to claim 1, is characterized in that: described LED is paster LED lamp.
7. LED display white balance driving circuit according to claim 1, is characterized in that: the wavelength of described red light is 625nm, the wavelength of green light is 525nm, the wavelength of blue lamp is 470nm.
8. LED display white balance driving circuit according to claim 1, is characterized in that: the brightness of described red light is 900mcd, the brightness of green light is 1800mcd, the brightness of blue lamp is 300mcd.
9. LED display white balance driving circuit according to claim 1, is characterized in that: colour temperature during described LED display white balance is 6500K.
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| CN201510460441.4A CN105118426A (en) | 2015-07-31 | 2015-07-31 | LED display screen white balance drive circuit |
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| CN201510460441.4A CN105118426A (en) | 2015-07-31 | 2015-07-31 | LED display screen white balance drive circuit |
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| CN111586915A (en) * | 2020-05-25 | 2020-08-25 | 马鞍山三投光电科技有限公司 | Full-color LED lamp control system and control method thereof |
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Application publication date: 20151202 |