CN204390688U - A kind of display control program reducing the low gray noise of LED display - Google Patents
A kind of display control program reducing the low gray noise of LED display Download PDFInfo
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- CN204390688U CN204390688U CN201520059088.4U CN201520059088U CN204390688U CN 204390688 U CN204390688 U CN 204390688U CN 201520059088 U CN201520059088 U CN 201520059088U CN 204390688 U CN204390688 U CN 204390688U
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Abstract
The utility model discloses a kind of display control program reducing the low gray noise of LED display, comprise the LED display control card and n group LED display unit with n circuit-switched data line, also comprise n chronotron, be defined as the 1st ~ the n-th chronotron successively, the output terminal of the i-th chronotron connects input end and i-th group of LED display unit of the i-th+1 chronotron respectively, wherein, i=2,3,4 ..., n-1, the blanking signal of the input end access LED display control card output of the 1st chronotron, the output terminal of the n-th chronotron connects n-th group of LED display unit.The utility model reduces multirow blanking burst pulse and starts the low grey noise superposition brought simultaneously, reduces the electromagnetic interference (EMI) of system, promotes the low grey display effect of display screen.
Description
Technical field
The utility model belongs to LED technology field, particularly a kind of display control program reducing the low gray noise of LED display.
Background technology
LED display, as the terminal of multimedia display, is used more and more extensive.Compared with traditional LED product, high density Small Distance LED display product is obtained for and significantly promotes in resolution, refresh rate, gray shade scale etc., and the degree of recognition of user is more and more higher.But after Small Distance LED display enters indoor, application conditions there occurs larger change: first, and indoor environment brightness reduces greatly; Secondly, viewing distance reduces greatly with LED product Small Distanceization; Another one distinguishing feature is indoor meeting, the user of Control Room, command & control also can pay close attention to screen for a long time continuously.Human eye, below indoor comparatively dark situation, for a long time, closely watches high brightness Small Distance LED display attentively, and the distinctive high brightness of LED usually can make people feel dazzling, even causes eyes to ache, sheds tears and eyesight reduction.Therefore, LED display brightness is too high, and bring visual fatigue can to the user of indoor application, even serious may cause people's eye injury that cannot make up.
The brightness requirement that Small Distance LED display indoors uses is very low, and from the angle of drived control, the reduction of display brightness means that a data high position is rejected a part, and the effect of low data is more outstanding.Such as maximum brightness is the data of 12 is 1111,1111,1111, due to the restriction of indoor display brightness, the brightness data of normal use may be transferred to 0001,1111,1111, the bits per inch time according to the show adopts the mode of sheet clipping time to realize usually, such as lowest order shows 1/512 of reference time, secondary low level shows 1/256 of reference time, and by that analogy, these nine valid data displaying times are followed successively by 1/512,1/256,1/128,1/64,1/32,1/16,1/8,1/4,1/2 of reference time.By the mode of sheet clipping time, both reduced brightness, the corresponding gray scale realized again.
For LED display control card, usual control card has 16-24 group and exports data, and the control signal often organizing data is sent by steering logic simultaneously, gets rid of the slight error of transmission path, can think that control signal arrives driving panel simultaneously.Shown in Fig. 1 is the drive principle figure of 1 group of data and control signal, and SCLK clock signal is supplied to the shift pulse of shift register, and each pulse will cause data move into or shift out one.Data in shift register are delivered to latch by STB latch signal, whether light at the enable control of the blanking signal OE LED that makes decision.Blanking signal OE is whole screen brightness control signal, and also for display screen blanking, the dutycycle adjusting it just can control the change of display brightness.
To the LED display unit with n circuit-switched data line in single control fabrication range of control, any moment has the capable data of parallel n (not to be the row be close to, but often organize the corresponding row of data line control) show simultaneously, the pulse of this n capable data corresponding data position also starts simultaneously, as shown in Figure 2, for Bit1 data bit, its pulse width is 1/256 of reference time, every field picture is when showing this data bit, n horizontal blanking impulse is along saltus step simultaneously, produce the low level burst pulse shown in Fig. 2, close again after opening moment at once, the harmonic wave of sharp-pointed pulses generation brings serious electromagnetic interference (EMI) to circuit.
Containing a large amount of high-frequency components in the burst pulse that the corresponding peak value in low gradation data position is larger, easily interference is produced to electronic system, affect low gray scale display effect.When the capable LED synchronization of 16-24 starts blanking signal, low gray noise is superposing instantaneously, causes display screen occurring mixed and disorderly loose point, the marginal position of especially low grey image, has had a strong impact on low gray scale display effect.
Chinese patent CN 102903329A discloses a kind of LED display brightness adjusting method not losing low gray scale, mainly solve when prior art carries out brightness regulation to LED display and easily lose low gray scale, thus cause the problem that the low gradation effect of LED display is deteriorated.This does not lose the LED display brightness adjusting method of low gray scale, comprises the following steps: 1. 8 gradation datas of pair incoming video signal carry out inverse gamma correction and are mapped to 16 gradation datas; 2. the luminance efficiency reduced as required, reduces the weight subfield number of the highest bit position in 16 gradation datas, namely completes the brightness regulation of LED display.This patent is by change gray scale arranged mode thus the luminance efficiency of reduction LED display reduces the brightness of shielding body.
Chinese patent CN103413540A discloses a kind of brightness adjusting method of LED display.Wherein the gradation data of LED display to incoming video signal realizes gray shade scale by sub-field method, and described brightness adjusting method comprises step: 1. the n position gradation data of pair incoming video signal carries out nonlinear transformation and is mapped to m position gradation data, and m is greater than n; 2. what at least change described m position gradation data takies subfield number summation, to realize the brightness regulation of described LED display.This patent changes the gradation data of tradition after anti-gamma correction and takes advantage of the mode of luminance factor to reduce the brightness of LED display, therefore there will not be in prior art the problem of losing low gray scale when reducing LED display brightness.
Above two publications solve emphatically low gradation data validity problem, ensure that gray scale details to a certain extent.But the burst pulse of multirow low gradation data position correspondence still starts, and pulse is narrower, disturbs larger simultaneously, the moment of low gray noise superposes the low gray scale display effect of still serious display screen.
Utility model content
In order to solve the technical matters that above-mentioned background technology proposes, the utility model aims to provide a kind of display control program reducing the low gray noise of LED display, reduce multirow blanking burst pulse and start the low grey noise superposition brought simultaneously, the electromagnetic interference (EMI) of reduction system, promotes the low grey display effect of display screen.
In order to realize above-mentioned technical purpose, the technical solution of the utility model is:
A kind of display control program reducing the low gray noise of LED display, comprise the LED display control card and n group LED display unit with n circuit-switched data line, n group LED display unit is defined as 1st ~ the n-th group of LED display unit successively, and the n circuit-switched data line one_to_one corresponding of described LED display control card controls 1st ~ the n-th group of LED display unit.This system also comprises n chronotron, be defined as the 1st ~ the n-th chronotron successively, the output terminal of described i-th chronotron connects input end and i-th group of LED display unit of the i-th+1 chronotron respectively, wherein, and i=2,3,4 ..., n-1, the blanking signal of the input end access LED display control card output of described 1st chronotron, the output terminal of the n-th chronotron connects n-th group of LED display unit.
Wherein, above-mentioned chronotron is D trigger delayer.
Wherein, above-mentioned chronotron is schmidt trigger chronotron.
Wherein, the delay time of a said n chronotron is identical.
Wherein, the delay time of a said n chronotron is entirely not identical.
Adopt the beneficial effect that technique scheme is brought:
The utility model adds chronotron between LED display control card and LED display unit, thus ensures that the blanking signal of low gradation data position starts successively according to chronotron setting delay time, reduces low gray noise, ensures the display effect of image.Realizability of the present utility model is comparatively strong, when former display control program overall logic structure is constant, adds necessary delay circuit.
Accompanying drawing explanation
Fig. 1 is Universal LED display driver theory diagram.
Fig. 2 is that traditional capable low gray scale blanking pulse of n starts schematic diagram simultaneously.
Fig. 3 is the system architecture schematic diagram that in embodiment, 8 groups of chronotrons are formed.
Fig. 4 is that in embodiment, the low gray scale blanking pulse dislocation of 8 row starts schematic diagram.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
Setting single control fabrication range of control is that 128 pixels are wide, 128 pixels are high, and display unit is 1/16 scan mode, needs 8 groups of data lines altogether.The system architecture schematic diagram of 8 groups of chronotron formations as shown in Figure 3, a kind of display control program reducing the low gray noise of LED display, comprise the LED display control card and 8 groups of LED display units with 8 circuit-switched data lines, 8 groups of LED display units are defined as the 1st ~ 8th group of LED display unit successively, and 8 circuit-switched data line one_to_one corresponding of described LED display control card control the 1st ~ 8th group of LED display unit.This system also comprises 8 chronotrons, be defined as the 1st ~ 8th chronotron successively, the output terminal of described i-th chronotron connects input end and i-th group of LED display unit of the i-th+1 chronotron respectively, wherein, and i=2,3,4 ..., 7, the blanking signal of the input end access LED display control card output of described 1st chronotron, the output terminal of the 8th chronotron connects the 8th group of LED display unit.In figure, OE is the original blanking signal that LED display control card exports, and OE1 ~ OE8 is the blanking signal after each group of chronotron time delay.
In the present embodiment, 8 groups of chronotrons all adopt D trigger delayer, and the delay time of 8 groups of chronotrons is all set to 60ns, and namely two row low gradation data digit pulse sequential meets and makes the blanking starting impulse of next line data and lastrow be spaced apart 60ns.As shown in Figure 4, under Bit1 pulse, jumping jumps edge than jumping along delayed 60ns under Bit1 pulse along than jumping under Bit0 pulse under delayed 60ns, Bit2 pulse, the like, jump edge under Bit6 pulse than jumping under Bit5 pulse along delayed 60ns.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (5)
1. one kind is reduced the display control program of the low gray noise of LED display, comprise the LED display control card and n group LED display unit with n circuit-switched data line, n group LED display unit is defined as 1st ~ the n-th group of LED display unit successively, the n circuit-switched data line one_to_one corresponding of described LED display control card controls 1st ~ the n-th group of LED display unit, it is characterized in that: also comprise n chronotron, be defined as the 1st ~ the n-th chronotron successively, the output terminal of described i-th chronotron connects input end and i-th group of LED display unit of the i-th+1 chronotron respectively, wherein, i=2, 3, 4, n-1, the blanking signal of the input end access LED display control card output of described 1st chronotron, the output terminal of the n-th chronotron connects n-th group of LED display unit.
2. a kind of display control program reducing the low gray noise of LED display according to claim 1, is characterized in that: described chronotron is D trigger delayer.
3. a kind of display control program reducing the low gray noise of LED display according to claim 1, is characterized in that: described chronotron is schmidt trigger chronotron.
4. a kind of display control program reducing the low gray noise of LED display according to claim 1, is characterized in that: the delay time of a described n chronotron is identical.
5. a kind of display control program reducing the low gray noise of LED display according to claim 1, is characterized in that: the delay time of a described n chronotron is entirely not identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520059088.4U CN204390688U (en) | 2015-01-28 | 2015-01-28 | A kind of display control program reducing the low gray noise of LED display |
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| CN201520059088.4U CN204390688U (en) | 2015-01-28 | 2015-01-28 | A kind of display control program reducing the low gray noise of LED display |
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| CN204390688U true CN204390688U (en) | 2015-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114615537A (en) * | 2020-11-24 | 2022-06-10 | 深圳市奥拓电子股份有限公司 | Zero-frame-delay video control system and method and LED display system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114615537A (en) * | 2020-11-24 | 2022-06-10 | 深圳市奥拓电子股份有限公司 | Zero-frame-delay video control system and method and LED display system |
| CN114615537B (en) * | 2020-11-24 | 2024-03-29 | 深圳市奥拓电子股份有限公司 | Zero-frame-delay video control system and method and LED display system |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20171025 Address after: 300300 Tianjin District of Dongli City Huaming high-tech industrial zone HuaFeng Road No. 6, block E No. 1 building 331-335 room Patentee after: TIANJIN HAOTIAN ELECTRONIC TECHNOLOGY CO., LTD. Address before: 210044 Nanjing City, Pukou Province, Nanjing Road, No. 219, No. six, No. Patentee before: Nanjing University of Information Science and Technology |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150610 Termination date: 20200128 |
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| CF01 | Termination of patent right due to non-payment of annual fee |