CN110223632A - Display screen correcting circuit and display screen - Google Patents
Display screen correcting circuit and display screen Download PDFInfo
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- CN110223632A CN110223632A CN201910680212.1A CN201910680212A CN110223632A CN 110223632 A CN110223632 A CN 110223632A CN 201910680212 A CN201910680212 A CN 201910680212A CN 110223632 A CN110223632 A CN 110223632A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The present invention provides a kind of display screen correcting circuit characterized by comprising the first comparison module, processing module and constant-current driven module；The first input end of first comparison module with a LED display unit for connecting, second input terminal of the first comparison module connects the first reference power supply, the output end of first comparison module and the input terminal of processing module connect, the output end of processing module and the adjustable side of constant-current driven module connect, and the output end of constant-current driven module is connect with LED display unit；The voltage value of first comparison module detection LED display unit, and it is compared with the first reference power supply, to export corresponding comparison signal, processing module receives corresponding comparison signal, so that correction be adjusted to the corresponding electric current of constant-current driven module output, that is, passes through the voltage of acquisition LED display unit, to realize that display screen corrects, voltage by then passing through acquisition LED display unit is corrected, and is not influenced by site environment, can carry out precise calibration to display screen.
Description
Technical field
The present invention relates to display screen technology fields, more particularly to a kind of display screen correcting circuit and display screen.
Background technique
LED (Light-Emitting Diode, light emitting diode) lamp bead because of itself characteristic, each lamp bead it is bright
Degree is different from, and is considered from industry manufacture and cost, carries out stepping, therefore LED according to brightness 1:1.3 after general LED encapsulation
Lamp bead itself has the luminance difference of maximum 30%, to affect the display consistency effect of LED display to a certain extent.
In order to promoted LED display brightness the uniformity and color consistency, it will usually to the LED lamp bead of display screen into
Row correction, currently, the method for the uniformity and color consistency correction to the brightness of LED display generallys use pointwise correction
Method is acquired by brightness to each pixel region on LED display or chroma data, provides each primary colours picture
The correction sytem matrix of element, is fed back to the control system of display screen, by control system correction coefficient, realizes to each
The otherness of pixel drives.
But with the development of LED display technology, LED display point spacing is smaller and smaller, and camera can not accurately identify aobvious
The brightness of display screen or chroma data, and the brightness acquired is influenced by site environment, so that the data error of acquisition is big, it can not be to aobvious
Display screen carries out precise calibration.
Summary of the invention
Based on this, it is necessary to which needle traditional display screen pointwise correction circuit acquisition data error is big, can not carry out to display screen
Precise calibration problem provides a kind of display screen correcting circuit and display screen.
A kind of display screen correcting circuit, comprising: the first comparison module, processing module and constant-current driven module；Described first
For connecting with a LED display unit, the second input terminal of first comparison module is used for the first input end of comparison module
The first reference power supply is connected, the output end of first comparison module is connect with the input terminal of the processing module, the processing
The output end of module is connect with the adjustable side of the constant-current driven module, the output end of the constant-current driven module be used for it is described
LED display unit connection；First comparison module is used to input in LED display unit work by described first
End obtains the voltage of the LED display unit, and the voltage of first reference power supply is obtained by second input terminal, is compared
The voltage of the voltage of the LED display unit and first reference power supply, obtains comparison signal, by the output end by institute
Comparison signal is stated to export to the processing module；The processing module is relatively believed for receiving the comparison signal according to described
The output electric current of number control constant-current driven module.
In one of the embodiments, when the voltage of the LED display unit is less than the voltage of first reference power supply
When, the comparison signal is the first comparison signal, when the voltage of the LED display unit is greater than the electricity of first reference power supply
When pressure, the comparison signal is the second comparison signal；The processing module is used for when receiving first comparison signal, control
The electric current for making the constant-current driven module increase output controls the constant current driving when receiving second comparison signal
Module reduces the electric current of output.
The display screen correcting circuit further includes at least one second comparator, each institute in one of the embodiments,
The first input end of the second comparator is stated for connecting with the LED display unit, the second of each second comparator inputs
For connecting with one second reference power supply, the output end of each second comparator and the input terminal of the processing module connect at end
It connects, the voltage of each second reference power supply is less than the voltage of first reference power supply, the electricity of each second reference power supply
Pressure is different, and the processing module is used for when receiving first comparison signal, the ratio exported according to second comparator
Compared with signal, the increase amplitude of the output electric current of the constant-current driven module is adjusted.
The display screen correcting circuit further includes at least one second reference power supply in one of the embodiments, respectively
Second input terminal of second comparator is connect with second reference power supply, the voltage etc. of each second reference power supply
Difference setting.
The display screen correcting circuit further includes at least one third comparator, each institute in one of the embodiments,
The first input end of third comparator is stated for connecting with the LED display unit, the second of each third comparator inputs
For connecting with a third reference power supply, the output end of each third comparator and the input terminal of the processing module connect at end
It connects, the voltage of each third reference power supply is greater than the voltage of first reference power supply, the electricity of each third reference power supply
Pressure is different, and the processing module is used for when receiving second comparison signal, the ratio exported according to the third comparator
Compared with signal, the reduction amplitude of the output electric current of the constant-current driven module is adjusted.
The display screen correcting circuit further includes at least one third reference power supply in one of the embodiments, respectively
Second input terminal of the third comparator is connect with a third reference power supply, the voltage etc. of each third reference power supply
Difference setting.
The display screen correcting circuit further includes memory module in one of the embodiments, and described first compares mould
The output end of block is connect with the input terminal of the memory module, the input of the output end of the memory module and the processing module
End connection；The memory module is used to store the comparison signal of the current period of first comparison module；The processing module
For when the LED display unit is in next cycling, reading the comparison signal of the memory module storage, according to described
Comparison signal controls the output electric current of the constant-current driven module.
The display screen correcting circuit further includes scan module in one of the embodiments, and the scan module is used
It is connect in the LED display unit, the scan module is also connect with the memory module, and the scan module is used for every
One period sent scanning signal to the LED display unit, so that the LED display unit works, the memory module is used for
According to the scanning signal, the comparison signal in the LED display unit is sequentially stored.
The display screen correcting circuit further includes control module in one of the embodiments, and described first compares mould
Block includes the first comparing unit and the second comparing unit, and the first input end of first comparing unit is used for aobvious with the LED
Show that mould group connects, the second input terminal of first comparing unit is for connecting the first default power supply, first comparing unit
Output end connect with the processing module, the first input end of second comparing unit is used for and the LED display unit
Connection, the second input terminal of second comparing unit is for connecting the second default power supply, the output of second comparing unit
End is connect with the input terminal of the processing module, and the control module is respectively compared with first comparing unit and described second
The power end of unit connects, and the control module is stopped for controlling the first comparing unit work and second comparing unit
It only works, or control the second comparing unit work and first comparing unit stop working.
A kind of display screen, including any of the above-described display screen school as described in the examples are provided in one of the embodiments,
Positive circuit.
Above-mentioned display screen correcting circuit, by lighting LED display unit, the first comparison module detects LED display unit
Voltage value, and be compared with the first reference power supply, to export corresponding comparison signal, processing module receives corresponding relatively letter
Number, so that correction be adjusted to the corresponding electric current of constant-current driven module output, that is, pass through the electricity of acquisition LED display unit
Pressure, to realize that display screen corrects, the voltage by then passing through acquisition LED display unit is corrected, not by site environment shadow
It rings, precise calibration can be carried out to display screen.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of display screen correcting circuit in an embodiment；
Fig. 2 is the structural schematic diagram of display screen correcting circuit in an embodiment；
Fig. 3 is the structural schematic diagram of display screen correcting circuit in another embodiment；
Fig. 4 is the structural schematic diagram of display screen correcting circuit in another embodiment；
Fig. 5 is the structural schematic diagram of display screen correcting circuit in another embodiment.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give better embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose of providing these embodiments is that making to understand more the disclosure
Add thorough and comprehensive.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term used herein is intended merely to the mesh of description specific embodiment
, it is not intended that in the limitation present invention.
For example, providing a kind of display screen correcting circuit, comprising: the first comparison module, processing module and constant-current driven module；
For the first input end of first comparison module for connecting with a LED display unit, the second of first comparison module is defeated
Enter end and connect for connecting the first reference power supply, the output end of first comparison module with the input terminal of the processing module,
The output end of the processing module is connect with the adjustable side of the constant-current driven module, and the output end of the constant-current driven module is used
It is connect in the LED display unit；First comparison module is used in LED display unit work, by described
First input end obtains the voltage of the LED display unit, obtains first reference power supply by second input terminal
Voltage, the voltage of the voltage of the LED display unit and first reference power supply, obtains comparison signal, by described
Output end exports the comparison signal to the processing module；The processing module is used to receive the comparison signal, according to
The comparison signal controls the output electric current of the constant-current driven module.
Above-mentioned display screen correcting circuit, by lighting LED display unit, the first comparison module detects LED display unit
Voltage value, and be compared with the first reference power supply, to export corresponding comparison signal, processing module receives corresponding relatively letter
Number, so that correction be adjusted to the corresponding electric current of constant-current driven module output, that is, pass through the electricity of acquisition LED display unit
Pressure, to realize that display screen corrects, the voltage by then passing through acquisition LED display unit is corrected, not by site environment shadow
It rings, precise calibration can be carried out to display screen.
In one of the embodiments, referring to Fig. 1, providing a kind of display screen correcting circuit 10, comprising: first compares mould
Block 100, processing module 200 and constant-current driven module 300；The first input end of first comparison module 100 is used for and a LED
Display unit 400 connects, and the second input terminal of first comparison module 100 is for connecting the first reference power supply 510, and described the
The output end of one comparison module 100 is connect with the input terminal of the processing module 200, the output end of the processing module 200 with
The adjustable side of the constant-current driven module 300 connects, and the output end of the constant-current driven module 300 with the LED for showing
Unit 400 connects；First comparison module 100 is used in the LED display unit 400 work, defeated by described first
Enter the voltage that end obtains the LED display unit 400, first reference power supply 510 is obtained by second input terminal
Voltage, the voltage of the voltage of the LED display unit 400 and first reference power supply 510, obtains comparison signal, leads to
The output end is crossed to export the comparison signal to the processing module 200；The processing module 200 is for receiving the ratio
Compared with signal, the output electric current of the constant-current driven module 300 is controlled according to the comparison signal.
It should be appreciated that LED display unit, that is, LED lamp bead, material and manufactured characteristic due to LED lamp bead, same rule
For the resistance value of the LED lamp bead of lattice same color there may be difference, general LED lamp bead generallys use constant-current driven module power supply,
Constant current is provided, since the resistance value of each LED lamp bead has differences, so that the voltage value of each lamp bead is different, it is corresponding,
The luminous power of LED lamp bead is different, so that LED lamp bead brightness has differences, in this way, passing through the first comparison module for acquisition
The voltage of LED display unit is compared with the voltage of the first reference power supply, exports comparison signal, and comparison signal is sent to
Processing module, processing module control the output electric current of constant-current driven module according to the comparison signal received, single to show to LED
The voltage of member is adjusted, and then keeps the luminous power of each LED display unit equal, that is, make the hair of LED display unit
Brightness is consistent, realizes the correction to display screen.Specifically, first comparison module is first voltage comparison module.
It should be appreciated that for the voltage value difference of its corresponding reference power supply of the lamp bead of different colours, for example, red
The reference voltage of LED lamp bead is less than the voltage of green LED lamp bead and blue led lamp bead, for the LED lamp bead of different colours, only
Corresponding reference power supply need to be connected.
Specifically, the first input end of the first comparison module is used to connect with LED display unit, i.e. the first comparison module
The voltage acquisition of first input end and LED display unit point connection, for acquiring the voltage of LED display unit, for example, the first ratio
It is connected compared with the first input end of module and the anode of LED display unit, i.e. the anode connection of LED lamp bead.
Above-mentioned display screen correcting circuit, by lighting LED display unit, the first comparison module detects LED display unit
Voltage value, and be compared with the first reference power supply, to export corresponding comparison signal, processing module receives corresponding relatively letter
Number, so that correction be adjusted to the corresponding electric current of constant-current driven module output, that is, pass through the electricity of acquisition LED display unit
Pressure, to realize that display screen corrects, the voltage by then passing through acquisition LED display unit is corrected, not by site environment shadow
It rings, precise calibration can be carried out to display screen.
For the correction to display screen is better achieved, in one of the embodiments, when the voltage of the LED display unit
Less than first reference power supply voltage when, the comparison signal be the first comparison signal, when the electricity of the LED display unit
When pressure is greater than the voltage of first reference power supply, the comparison signal is the second comparison signal；The processing module is for working as
When receiving first comparison signal, the electric current of constant-current driven module increase output is controlled, when receiving described second
When comparison signal, the electric current that the constant-current driven module reduces output is controlled.
Specifically, when the first input end of first comparison module is normal phase input end, first comparison signal
For low level signal, the second comparison signal is high level signal；When the first input end of first comparison module is that reverse phase is defeated
When entering to hold, first comparison signal is high level signal, and second comparison signal is low level signal.When the LED is aobvious
When showing that the voltage of unit is less than the voltage of first reference power supply, then the luminous intensity of LED display unit is relatively weak, processing
After module is by receiving the first comparison signal, the constant-current driven module increase output electric current is controlled, so that corresponding LED is shown
The luminous intensity of unit increases, when the voltage of the LED display unit is greater than the voltage of first reference power supply, then LED
The luminous intensity of display unit is relatively strong, after processing module is by receiving the second comparison signal, controls the constant current driving mould
Block reduces output electric current, so that corresponding LED display unit luminous intensity reduces, so that the correction of display screen be better achieved.
It is in one of the embodiments, referring to Fig. 2, described in order to accurately adjust the output electric current of constant-current driven module
Display screen correcting circuit 10 further includes at least one second comparator 600, and the first input end of each second comparator 600 is used
It is connect in the LED display unit 400, the second input terminal of each second comparator 600 is used for and one second benchmark electricity
Source 520 connects, and the output end of each second comparator 600 is connect with the input terminal of the processing module 300, and each described second
The voltage of reference power supply 520 is less than the voltage of first reference power supply 510, and the voltage of each second reference power supply 520 is not
Together, the processing module 200 is used for when receiving first comparison signal, according to second comparator 600 output
Comparison signal adjusts the increase amplitude of the output electric current of the constant-current driven module 300.Specifically, by the way that at least one is arranged
Second comparator, the first input end of each second comparator are used to acquire the voltage of LED display unit, each second ratio
The second input terminal compared with device is used to connect with one second reference power supply, and the voltage of each second reference power supply is less than first benchmark
The voltage of power supply, and the voltage of each second reference power supply is different, in this way, when the first comparison module detects that the LED is aobvious
When showing the voltage of unit less than the first reference voltage, by judging the comparison signal of corresponding second comparator output, with accurate
The increase amplitude for adjusting the output electric current of the constant-current driven module, realizes the accurate output electric current for adjusting constant-current driven module.
For example, the quantity of second comparator has 2, and it is 2.6V for the voltage of one second reference power supply, another second reference power supply
It is 2.8V, the voltage of the first reference power supply is 3V, when the voltage of LED display unit is less than 2.6V, i.e. LED display unit
Voltage less than the second reference power supply voltage when, the comparison signal that processing module is exported according to the second comparator, adjust constant current drive
The output electric current of dynamic model block increases 10%, and when the voltage of LED display unit, which is greater than 2.6V, is less than 2.8V, processing module is according to the
The comparison signal of two comparators output, the output electric current for adjusting constant-current driven module increases 5%, should be noted, in the present embodiment,
Voltage chooses numerical value only to facilitate better understanding the technical solution of the application, and actual value can be set according to the actual situation
It is fixed.It should be appreciated that the quantity of the second comparator is more, the voltage range that the second reference power supply is covered is wider, then current regulation
It is more accurate.
It is in one of the embodiments, referring to Fig. 3, described aobvious in order to further enhance the accuracy of display screen correction
Display screen correcting circuit 10 further includes at least one second reference power supply 520, the second input terminal of each second comparator 600 with
One second reference power supply 520 connects, the voltage equal difference setting of each second reference power supply 520.Specifically, by will be each
The voltage equal difference of second reference power supply is arranged, and the comparison signal that the second comparator can be made to export needs to adjust with constant-current driven module
The electric current proportion relation of section, and the second reference power supply can preferably determine the electricity of LED display unit in equal difference setting
Range is pressed, for example, the quantity of the second comparator there are 4, the quantity of the second reference power supply there are 4, the voltage of the second reference power supply
Respectively the voltage of 2.9V, 2.8V, 2.7V, 2.6V, the first reference power supply is 3.0V, in this way, exported by the second comparator
Comparison signal can determine the voltage range of LED display unit, preferably to adjust the increasing of the output electric current of constant-current driven module
Significantly, further to promote the accuracy that display screen corrects.
It is in one of the embodiments, referring to Fig. 2, described in order to accurately adjust the output electric current of constant-current driven module
Display screen correcting circuit 10 further include at least one third comparator 700, the first input end of each third comparator 700
For connecting with the LED display unit 400, the second input terminal of each third comparator 700 is used for and a third benchmark
Power supply 530 connects, and the output end of each third comparator 700 connect with the input terminal of the processing module 200, and each described the
The voltage of three reference power supplies 530 is greater than the voltage of first reference power supply 510, the voltage of each third reference power supply 530
Difference, the processing module 200 are used for when receiving second comparison signal, are exported according to the third comparator 700
Comparison signal, adjust the constant-current driven module 300 output electric current reduction amplitude.Specifically, passing through setting at least one
A third comparator, the first input end of each third comparator are used to acquire the voltage of LED display unit, each third
For second input terminal of comparator for connecting with a third reference power supply, the voltage of each third reference power supply is greater than first base
The voltage of quasi- power supply, and the voltage of each third reference power supply is different, in this way, when the first comparison module detects the LED
When the voltage of display unit is greater than the first reference voltage, by judging the comparison signal of corresponding third comparator output, with standard
The reduction amplitude for really adjusting the output electric current of the constant-current driven module realizes the accurate output electricity for adjusting constant-current driven module
Stream.For example, the quantity of the third comparator has 2, and it is 3.2V for the voltage of a third reference power supply, another third benchmark electricity
Source is 3.4V, and the voltage of the first reference power supply is 3V, when the voltage of LED display unit is greater than 3.4V, i.e. LED display unit
Voltage be greater than third reference power supply voltage when, the comparison signal that processing module export according to third comparator, adjusting constant current
The output electric current of drive module reduces 10%, when the voltage of LED display unit, which is greater than 3.2V, is less than 3.4V, processing module according to
The comparison signal of third comparator output, the output electric current for adjusting constant-current driven module reduce 5%, should be noted, the present embodiment
In, voltage chooses numerical value only to facilitate better understanding the technical solution of the application, and actual value can be according to practical feelings
Condition setting.It should be appreciated that the quantity of third comparator is more, the voltage range that third reference power supply is covered is wider, then electric current
It adjusts more accurate.
It is in one of the embodiments, referring to Fig. 2, described aobvious in order to further enhance the accuracy of display screen correction
Display screen correcting circuit 10 further includes at least one third reference power supply 530, the second input terminal of each third comparator 700 with
The one third reference power supply 530 connects, the voltage equal difference setting of each third reference power supply 530.Specifically, by will be each
The voltage equal difference of third reference power supply is arranged, and the comparison signal that third comparator can be made to export needs to adjust with constant-current driven module
The electric current proportion relation of section, and third reference power supply can preferably determine the electricity of LED display unit in equal difference setting
Range is pressed, for example, the quantity of third comparator has 4, third reference power supply has 4, and voltage is respectively 3.1V, 3.2V,
The voltage of 3.3V, 3.4V, the first reference power supply is 3.0V, in this way, the comparison signal exported by third comparator, can determine
The voltage range of LED display unit, so that processing module can more accurately adjust the constant current driving according to comparison signal
The reduction amplitude of the output electric current of module, further to promote the accuracy of display screen correction.
Efficiency and accuracy are corrected in order to further enhance display screen, in one of the embodiments, referring to Fig. 3, institute
The display screen correcting circuit 10 stated further includes memory module 800, the output end of first comparison module 100 and the storage mould
The input terminal of block 800 connects, and the output end of the memory module 800 is connect with the input terminal of the processing module 200；It is described to deposit
Storage module 800 is used to store the comparison signal of the current period of first comparison module 100；The processing module 200 is used for
When the LED display unit 400 is in next cycling, the comparison signal that the memory module 800 stores is read, according to institute
State the output electric current that comparison signal controls the constant-current driven module 300.It should be appreciated that the transmission due to signal needs centainly
Time, by the way of being adjusted in acquisition, when display screen is lighted with the higher frequency driving in other words of faster speed, place
The adjustment signal for managing module generation may be asynchronous with the comparison signal of the first comparison module, the abnormal situation of correction occurs, leads to
Setting memory module is crossed, first the comparison signal of the first comparison module output can be stored in a storage module, shown to LED single
At next period, processing module controls the constant-current driven module further according to the comparison signal of the storage of memory module for member work
Output electric current, i.e., acquisition step and regulating step substep are carried out, acquisition step is only to the comparison signal of the first comparison module
Be acquired, regulating step only according to the comparison signal of acquisition adjust constant-current driven module output electric current, even if display screen with
Faster speed drives LED display unit, and memory module can also store the comparison signal of corresponding LED display unit, adjust
In step, the comparison signal that processing module is stored according to memory module adjusts the output electric current of corresponding constant-current driven module.I.e.
Can to display screen carry out precise calibration, in this way, by setting memory module, can further be promoted display screen correction efficiency and
Accuracy.
The memory module includes register, selector and latch in one of the embodiments, the register
Input terminal is connect with first comparison module, and the output end of the register is connect with the input terminal of the latch, described
The output end of latch is connect with the input terminal of the processing module, the selector respectively with the enable end of the register and
The enable end of the latch connects, and the selector is for controlling the latch while controlling the registers
While stopping working, or stop working for controlling the register, the latch work is controlled.In this way, when described
LED display unit worked in the period 1, and selector control registers and latch do not work, and register is for storing
The comparison signal of the period 1 of first comparison module, when LED storage unit work is in second round, selector is controlled
Register stops working and latch work, and processing module is used for the comparison signal of latch storage, according to the comparison signal
The output electric current of the constant-current driven module is controlled, is compared in this way, the memory module can be thus achieved for storing described first
Compared with the comparison signal of the current period of module；The processing module is used for when the LED display unit is in next cycling,
The comparison signal for reading the memory module storage controls the output electricity of the constant-current driven module according to the comparison signal
Stream.
Comparison signal in order to preferably realize memory module storage is corresponding with LED display unit, wherein a reality
Apply in example, referring to Fig. 4, the display screen correcting circuit 10 further includes scan module 900, the scan module 900 be used for
The LED display unit 400 connects, and the scan module 900 is also connect with the memory module 800, the scan module 800
For sending single pass signal to the LED display unit 400 in each period, so that 400 work of the LED display unit
Make, the memory module 800 is used to sequentially store the comparison letter in the LED display unit 400 according to the scanning signal
Number.In one embodiment, the scan module is row scan module, and the scanning signal is line scan signals.Specifically,
LED display generallys use scanning signal and lights LED display unit, and LED display unit lights sequence and frequency and scanning letter
It is number corresponding, by the way that scanning signal to be connect with memory module, so that memory module storage sequentially stores the LED display unit
Comparison signal so that the hop frequencies of memory module storage location are corresponding with LED display unit ignition frequency, i.e., so that depositing
The comparison signal for storing up the storage location storage of module is corresponding with a LED display unit, realizes the comparison of memory module storage
Signal is synchronous with LED display unit.
For the ease of being corrected to display screen, the display screen correcting circuit is also wrapped in one of the embodiments,
Control module is included, first comparison module includes the first comparing unit and the second comparing unit, first comparing unit
First input end with the LED display module for connecting, and the second input terminal of first comparing unit is for connecting first
Default power supply, the output end of first comparing unit are connect with the processing module, and the first of second comparing unit is defeated
Enter end for connecting with the LED display unit, the second input terminal of second comparing unit is for connecting the second default electricity
The output end in source, second comparing unit is connect with the input terminal of the processing module, the control module respectively with it is described
The connection of the power end of first comparing unit and second comparing unit, the control module are relatively more single for controlling described first
Member work and second comparing unit stop working, or control second comparing unit works and described first is relatively more single
Member stops working.Specifically, due to red lamp bead, blue lamp bead and green lamp bead are because of material, the base that causes it to use
The voltage of quasi- power supply is different, and the lamp bead of different colors need to be made reference using different reference power supplies, in general, red lamp bead institute
Corresponding reference voltage is lower with the green reference voltage of lamp bead than blue lamp pearl, and benchmark needed for blue lamp bead and green lamp bead
Power supply is close, can use same reference power supply, by the way that control module, the first comparing unit and the second comparing unit is arranged, when
When being corrected to the red lamp bead of display screen, stopped working by the work of the first comparing unit of control and the second comparing unit,
When to display screen blue lamp bead or green lamp bead be corrected when, it is relatively more single by the work of the second comparing unit of control and first
Member stops working, in order to provide corresponding reference power supply for the lamp bead of different colours in display screen, for the ease of to display
Screen is corrected.It should be appreciated that the first comparison module can also be arranged to three comparing units, it is each in LED display unit
The lamp bead of color connects a comparing unit, i.e. the lamp bead of different colours uses different reference power supplies, in the present embodiment, no longer
It repeats.
The display screen correcting circuit further includes the first reference power supply in one of the embodiments, first benchmark
Power supply is connect with the second input terminal of first comparison module, specifically, user can show according to the LED to different colours
When unit is corrected, by adjusting the voltage of the first reference power supply, to be suitable for the LED display unit to different colours,
Multiple first reference power supplies can be set, for example, two reference power supplies of setting, one first reference power supply and the first comparing unit
The connection of second input terminal, another reference power supply are connect with the second input terminal of the second comparing unit, the electricity of one first reference power supply
Pressure is corresponding with the reference voltage of red LED display unit, and the voltage and blue or green LED of another first reference power supply are shown
The reference voltage of unit is corresponding.
It is a specific embodiment below, referring to Fig. 5, providing a kind of display screen correcting circuit 10, comprising: first compares mould
Block 100, processing module 200, constant-current driven module 300, at least one second comparator 600, at least one second reference power supply
520, at least one third comparator 700, at least one third reference power supply 530, memory module 800 and scan module 900；Institute
The first input end for stating the first comparison module 100 is used to connect with a LED display unit 400, first comparison module 100
Second input terminal is for connecting the first reference power supply 510, the output end of first comparison module 100 and the memory module
800 input terminal connection, the first input end of each second comparator 600 are connect with the LED display unit 400, each institute
The second input terminal for stating the second comparator 600 is used to connect with second reference power supply 520, each second comparator
600 output end is connect with the input terminal of the memory module 800, the first input end of each third comparator 700 and institute
The connection of LED display unit 400 is stated, the second input terminal of each third comparator 700 and a third reference power supply 530 connect
It connects, the output end of each third comparator 700 is connect with the input terminal of the memory module 800, the memory module 800
Output end is connect with the input terminal of the processing module 200, the output end and the constant-current driven module of the processing module 200
300 adjustable side connection, the output end of the constant-current driven module 300 with the LED display unit 400 for connecting；It is described
For connecting with the LED display module 400, the scan module 900 also connects with the memory module 800 scan module 900
It connects, specifically, LED display unit can be a LED lamp bead, is also possible to multiple LED lamp beads, in one embodiment, when
When scan module is row scan module, LED display unit is a column LED lamp bead in display module, that is to say, that in display module
First comparison module is arranged in each column lamp bead, and a display screen correction electricity is arranged in each column lamp bead in display module in other words
Road.
A kind of display screen, including any of the above-described display screen correcting circuit as described in the examples.
Above-mentioned display screen, by lighting LED display unit, the first comparison module detects the voltage value of LED display unit, and
It is compared with the first reference power supply, to export corresponding comparison signal, processing module receives corresponding comparison signal, thus right
Correction is adjusted in the corresponding electric current of constant-current driven module output, i.e., by the voltage of acquisition LED display unit, to realize
Display screen correction, the voltage by then passing through acquisition LED display unit are corrected, are not influenced by site environment, can be to display
Screen carries out precise calibration.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of display screen correcting circuit characterized by comprising the first comparison module, processing module and constant-current driven module；
The first input end of first comparison module with a LED display unit for connecting, and the of first comparison module
Two input terminals connect for connecting the first reference power supply, the output end of first comparison module and the input terminal of the processing module
It connects, the output end of the processing module is connect with the adjustable side of the constant-current driven module, the output of the constant-current driven module
End with the LED display unit for connecting；
First comparison module is used to obtain the LED by the first input end in LED display unit work
The voltage of display unit, the voltage of first reference power supply is obtained by second input terminal, and the LED display is single
The voltage of member and the voltage of first reference power supply, obtain comparison signal, by the output end that the comparison signal is defeated
Out to the processing module；
The processing module controls the defeated of the constant-current driven module according to the comparison signal for receiving the comparison signal
Electric current out.
2. display screen correcting circuit according to claim 1, which is characterized in that when the voltage of the LED display unit is small
When the voltage of first reference power supply, the comparison signal is the first comparison signal, when the voltage of the LED display unit
Greater than first reference power supply voltage when, the comparison signal be the second comparison signal；
The processing module is used for when receiving first comparison signal, controls the constant-current driven module increase output
Electric current controls the electric current that the constant-current driven module reduces output when receiving second comparison signal.
3. display screen correcting circuit according to claim 2, which is characterized in that it further include at least one second comparator,
The first input end of each second comparator with the LED display unit for connecting, and the second of each second comparator
Input terminal with one second reference power supply for connecting, the output end of each second comparator and the input terminal of the processing module
Connection, the voltage of each second reference power supply are less than the voltage of first reference power supply, each second reference power supply
Voltage is different, and the processing module is used for when receiving first comparison signal, according to second comparator output
Comparison signal adjusts the increase amplitude of the output electric current of the constant-current driven module.
4. display screen correcting circuit according to claim 3, which is characterized in that further include at least one second benchmark electricity
Source, the second input terminal of each second comparator are connect with second reference power supply, each second reference power supply
The setting of voltage equal difference.
5. display screen correcting circuit according to claim 2, which is characterized in that it further include at least one third comparator,
The first input end of each third comparator with the LED display unit for connecting, and the second of each third comparator
Input terminal with a third reference power supply for connecting, the output end of each third comparator and the input terminal of the processing module
Connection, the voltage of each third reference power supply are greater than the voltage of first reference power supply, each third reference power supply
Voltage is different, and the processing module is used for when receiving second comparison signal, according to third comparator output
Comparison signal adjusts the reduction amplitude of the output electric current of the constant-current driven module.
6. display screen correcting circuit according to claim 5, which is characterized in that further include at least one third benchmark electricity
Source, the second input terminal of each third comparator are connect with a third reference power supply, each third reference power supply
The setting of voltage equal difference.
7. according to claim 1 to display screen correcting circuit described in 6 any one, which is characterized in that it further include memory module,
The output end of first comparison module is connect with the input terminal of the memory module, the output end of the memory module with it is described
The input terminal of processing module connects；The memory module is used to store the comparison letter of the current period of first comparison module
Number；
The processing module is used to read the memory module storage when the LED display unit is in next cycling
Comparison signal controls the output electric current of the constant-current driven module according to the comparison signal.
8. display screen correcting circuit according to claim 7, which is characterized in that it further include scan module, the scanning mould
Block with the LED display unit for connecting, and the scan module is also connect with the memory module, and the scan module is used for
Single pass signal is sent to the LED display unit in each period, so that the LED display unit works, the storage
Module is used to sequentially store the comparison signal in the LED display unit according to the scanning signal.
9. display screen correcting circuit according to claim 1, which is characterized in that it further include control module, first ratio
Include the first comparing unit and the second comparing unit compared with module, the first input end of first comparing unit be used for it is described
The connection of LED display module, for connecting the first default power supply, described first compares the second input terminal of first comparing unit
The output end of unit is connect with the processing module, and the first input end of second comparing unit with the LED for showing
Unit connection, the second input terminal of second comparing unit are used to connect the second default power supply, second comparing unit
Output end is connect with the input terminal of the processing module, the control module respectively with first comparing unit and described second
The power end of comparing unit connects, and the control module is for controlling the first comparing unit work and described second relatively more single
Member stops working, or control the second comparing unit work and first comparing unit stop working.
10. a kind of display screen, which is characterized in that including the display screen correcting circuit as described in any one of claim 1 to 9.
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| CN201910680212.1A CN110223632A (en) | 2019-07-26 | 2019-07-26 | Display screen correcting circuit and display screen |
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