CN101025893A - Scanning LED display device - Google Patents
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- CN101025893A CN101025893A CNA2006101698482A CN200610169848A CN101025893A CN 101025893 A CN101025893 A CN 101025893A CN A2006101698482 A CNA2006101698482 A CN A2006101698482A CN 200610169848 A CN200610169848 A CN 200610169848A CN 101025893 A CN101025893 A CN 101025893A
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Abstract
The invention relates to a scanning LED displaying device, including a controlling device, a number of drivers connected with voltage, and rank-driver and displaying unit. The displaying unit includes a number of pixels and each pixel is composed of a number of LED modules with different colors. The positive poles of LED modules with the same colors connect with corresponding rank-drivers. The negative poles of LED modules with the same colors connect with the output of the rank-drivers. The controlling device sends out row-controlling signals and rank-controlling signals according to the showing information to control respectively corresponding rank-driver and row-driver, and make each pixel in different color LED modules lights.
Description
[technical field]
The present invention relates to a kind of LED display device, relate in particular to a kind of scan type LED display screen.
[background technology]
At present, the LED display device is according to showing that control mode generally can be divided into static state and two kinds of scannings.The static demonstration all controlled separately by hardware each LED in the LED electronic display with exactlying, and all LED while of whole LED display screen is controlled.This mode great advantage is that program design is simple, and the picture flicker free.But there is fatal shortcoming in this design: the circuit complexity, and the hardware utilization factor is low, and cost is huge.
And along with the progress of LED manufacturing process, the brightness of LED is significantly improved, and LED display more and more adopts dynamic scan to realize showing at present.
As shown in figure 13, existing exemplary scanning type LED display device 30 generally comprises line driver 31, row driver 32 and some arranged pixels 33 that is.Wherein each pixel 33 comprises red LED, green LED and blue led.The LED of all different colors generally is divided into several rows H1, H2...Hn and some row L1, L2...Ln.Wherein each row LED and 31 connections of corresponding line driver, the output terminal connection that all LED and row driver 32 are corresponding.
If will show a frame picture, the line driver 31 of the first row LED correspondence is received control signal Hs1 and is driven, thereby loads task driven voltage (not shown) at the positive pole of the first row LED.This row driver 32 is received row control signal Ls, thereby lights the first row LED, by this row control signal Ls, thereby determines which LED is luminous among this first row LED, and which LED is not luminous.This meaning of lighting is that the LED of delegation is loaded simultaneously and is controlled by row driver 32, as for whether luminous, need see whether the data-signal among the row control signal Ls needs those LED among this row LED luminous.By same mode, successively all row LED have been lighted, promptly provided the picture of a frame.
Yet this scan type LED display unit 33 major defects are: because all LED are with the scanning of advancing, and each row LED lights successively, so lighting of the LED in each pixel is the interval.And this interlude is long more, and is intense poor to the thorn of eye, thereby causes the reduction of display frame stability.In order to shorten this interval, a kind of effective measures are the sweep frequencies that improve scan type LED display unit 33, yet the raising of sweep frequency, the circuit that also will cause driving, control this pixel 33 is more complicated, and too high sweep frequency will increase the noise of this circuit, this noise also will influence the operate as normal of this circuit conversely, thereby reduce the effect that shows.
In view of this, provide a kind of scan type LED display unit that overcomes above defective to become the technical task that present urgent need solves.
[summary of the invention]
The object of the present invention is to provide a kind of scan type LED display unit that can effectively improve vision stability.
For achieving the above object, the invention provides a kind of scan type LED display unit, several rows driver, row driver and display unit that it comprises control device, is connected with operating voltage.Wherein this display unit comprises some pixels, and each pixel is made up of some LED modules with different colors unit.The positive pole of same color LED unit and corresponding line driver connection in these some pixels, the output terminal that the negative pole of this same color LED unit is corresponding with this row driver connects.Wherein this control device is according to the information output row control signal and the row control signal that will show, corresponding line driver and this row driver of control respectively makes that the LED unit of different colours is lighted successively in each pixel.
Compared with prior art, the positive pole of same color LED unit is to connect with corresponding line driver in some pixels of scan type LED display unit of the present invention, and the output terminal that the negative pole of this same color LED unit is corresponding with this row driver connects.Wherein this control device is according to the information output row control signal and the row control signal that will show, corresponding line driver and this row driver of control respectively makes that the LED unit of different colours is lighted successively in each pixel.Therefore, for luminous pixel, the LED unit of the different colours of this light emitting pixel is simultaneously luminous successively, thereby makes the LED unit of the different colours that light emitting pixel is interior send the light of different colours continuously, constantly stimulate people's visual perception, thereby can effectively improve the stability of display frame.
[description of drawings]
Fig. 1 is the schematic construction block diagram of first embodiment of the invention scan type LED display unit.
Fig. 2 is the circuit theory synoptic diagram of first embodiment MCU that is connected with Memory.
Fig. 3 is the first embodiment partial circuit principle schematic.
Fig. 4 is the synoptic diagram of arranging of LED in the display unit among Fig. 3.
Fig. 5 is the capable control signal of MCU generation among Fig. 2 and the sequential synoptic diagram of row control signal.
Fig. 6 is the invention second embodiment partial circuit principle schematic.
Fig. 7 is the synoptic diagram of arranging of LED in the display unit among Fig. 6.
Fig. 8 is invention the 3rd an embodiment partial circuit principle schematic.
Fig. 9 is the capable control signal sequential synoptic diagram that MCU produces among the 3rd embodiment.
Figure 10 is invention the 4th an embodiment partial circuit principle schematic.
Figure 11 is the synoptic diagram of arranging of LED in the display unit among Figure 10.
Figure 12 is the capable control signal of the 4th embodiment MCU generation and the sequential synoptic diagram of row control signal.
Figure 13 is existing scan type LED display unit partial circuit principle schematic.
[embodiment]
The present invention is described in detail below in conjunction with accompanying drawing.
Embodiment of the invention scan type LED display unit is mainly used in information such as the image that receives and show various peripheral hardwares (as computer, player etc.) and pass over, literal, but also is not limited thereto.
As shown in Figure 1, in the first embodiment of the invention, this scan type LED display unit 10 mainly comprises control device 11, drive unit 12 and display unit 13.This drive unit 12 comprises line driver 121,122,123 and row driver 129, below describes in detail.This display unit 13 comprises some pixels, and generally these some pixels are arranged, according to the actual displayed needs, also can be other forms and arranges.And this pixel also can be arranged on some cell boards (as the element circuit plate) as required, then some cell boards is spliced into whole large-size screen monitors; Also can only be arranged on the substrate, arrange that specifically fibrous root is according to specifically needing and deciding.For convenience of explanation, Fig. 2 and Fig. 3 disclose p * q pixel, and LED capable by n and the m row constitute display unit 13 and describe the principle of the invention in detail, therefore are not limited thereto.
As shown in Figures 2 and 3, in first embodiment, each pixel comprises the LED unit of three kinds of colors, also is red LED unit, green LED unit and blue led unit, certainly also can comprise the LED unit of two kinds, four kinds or more colors as required, describe in detail in following examples.In the present embodiment, this red LED unit, green LED unit and blue led unit comprise red LED, green LED and a blue led respectively.
As Fig. 1, Fig. 2, shown in Figure 5, in first embodiment, this control device 11 is mainly used in and produces row control signal Hsel and row control signal Rs, control and drive line driver 121,122,123 and row driver 129 respectively, light with color LED units synchronization to allow successively, below describe in detail.
As depicted in figs. 1 and 2, in the present embodiment, this control device 11 comprises MCU, as the MC68HC908LJ12 of Motorola Inc. (Motorola).This MCU with information processings such as image, literal after, output row control signal and row control signal.In addition, this MCU also can connect a memory storage 14, deposits information such as this image, literal.In the present embodiment, this memory storage 14 can be Memoty (storer), the SDRAM of 64 megabyte for example, it can be that the model that ISSI company provides is SDRAM of HY57V643220 etc. for the SDRAM of K4S643232, the model that Winbond company provides for the SDRAM of W986432, the model that HYNIX company provides for the SDRAM of IS42S32200, the model that Samsung electronics, inc. provides.
In addition, this control device 11 also can be FPGA (field programmable gate array), for example ALETRA company model is provided is the FPGA of EP1C6Q208.Based on the signal among Fig. 5, this FPGA passes through the editor to its internal logic module, thereby also can be with after the information processings such as image, literal, capable control signal Hsel and row control signal Rs that output is identical with this MCU output.And the FPGA of other manufacturers produce equally also can realize above-mentioned functions through same editor.
As shown in Figure 5, this row control signal Hsel comprises two looks selection signal Hsel0, Hsel1, and in the present embodiment, these two looks select signal Hsel0, Hsel1 through a code translator 15, for example existing two or four code translators, thus three look gating signal SelR, SelG, SelB produced.Wherein the output terminal of look gating signal SelR, SelG, SelB connects with corresponding line driver 121,122,123 respectively, controls the Push And Release of this line driver 121,122,123, below describes in detail.In the present embodiment, this two or four code translator can be realized with 74HC139,74HC138,74HC154 code translator that Philips company provides.
This array selecting signal Rs comprises clock signal C lk, load signal Load, enable signal En and data-signal Data, these signals will be controlled row driver 129, so that after the LED unit of a certain color is loaded, it is luminous to control in all this color LED unit those, and those are not luminous, thereby information such as the figure of demonstration expectation, literal below describe in detail on display unit 13.
In first embodiment, the positive pole of homochromy LED unit connects with corresponding line driver, specifically, the positive pole of this red LED unit, green LED unit and blue led unit is connected with line driver 121,122,123 respectively, and an input end of this line driver 121,122,123 is connected with operating voltage VCC simultaneously.As shown in Figure 5,, then select this line driver 121 to open, thereby, be carried in the positive pole of all red LED unit at the output terminal outputting drive voltage of line driver 121 when certain gating signal of the same colour such as SelR level are low.Equally, when SelG or SelB level when low, then load all green LED unit or blue led unit.Thereby realize loading successively this red LED unit, green LED unit and blue led unit.Thereby allow in each pixel the LED unit of different colours light continuously successively, continued stimulus people's eyes, thus improve the stability of vision.
This line driver 121,122,123 is identical in the present embodiment, can be the FDS4953 chip.Two input pins of this FDS4953 chip are connected with the output terminal of VCC and corresponding look gating signal respectively, as the output terminal of SelR.When this SelR was low level, the output terminal of this FDS4953 chip was loaded into the positive pole of red LED unit with outputting drive voltage, thereby realized loading.Certainly, this line driver 121,122,123 is not limited in this, also can be technical field personnel know under other the on-off circuit or the chip of other types; The chip or the circuit of gating when also can to select the look gating signal be high.
In first embodiment, this row driver 129 is mainly used in and receives the row control signal Rs that this MCU or FPGA send, drive the homochromy LED unit that has loaded, thereby light this homochromy LED unit, and it is luminous to control in this homochromy LED unit of lighting those LED unit, and those LED unit are not luminous.Lighting here is meant when homochromy LED unit is loaded by line driver to be controlled by row driver 129.Those LED unit are luminous in this is homochromy LED unit, and the not luminous fibrous root in those LED unit is determined according to data-signal Data, below describes in detail.
This row driver 129 can be the MBI5026 chip, also can be the chip such as ZQ9722, ZQ9729 chip of Beijing Zhongqing Micro-digit Equipment Development Co., Ltd.
During work, this MCU handles the information that will show, and exports these two looks and select signal Hsel0, Hsel1 and this clock signal C lk, load signal Load, enable signal En and data-signal Data.These two looks select signal Hsel0, Hsel1 through code translator 15, thereby produce three look gating signal SelR, SelG, SelB.These three look gating signal SelR, SelG, SelB can only have one to be low level simultaneously, and as SelR, remaining SelG, SelB then are high level.For example, when SelR is low level, as mentioned above, all red LED unit will be loaded, and promptly be connected to driving voltage on its positive pole.
In addition, this MCU also exports row control signal Rs to the homochromy LED unit that should be loaded.In this row control signal Rs, data-signal Data moves on to this row driver 129 along with clock signal C lk goes here and there synchronously.Specifically, as shown in Figure 5, in basic cycle Tc, arranged several clock period, the number of concrete clock period is following to be described in detail, below is that example is elaborated with 16 clock period.Clock period of every interval, a color data bit will go here and there synchronously and move on to this row driver 129, and when through 16 clock period, this row driver 129 will latch the color data of 16 bit, i.e. bit1, bit2......bit16.The value of each color data bit1, bit2......bit16 is 0 or 1, and when being 0, corresponding LED unit will be not luminous; When being 1, corresponding LED unit below describes in detail luminous.
As shown in Figure 3 and Figure 4, because present embodiment has m * n LED unit, therefore through behind m * n the clock, each LED unit obtains a color data bit.But because each pixel has only a kind of LED unit of color to need this color data bit in a basic cycle Tc, therefore only needing provides the color data bit that loads corresponding color LED unit to get final product to each pixel; Just the output terminal that this row driver 129 is corresponding with this color data is connected with the negative pole of all LED unit in the respective pixel.Can simplify the quantity of row driver output so greatly.Therefore through after only needing p * q clock, each pixel obtains a color data bit, thus each homochromy LED unit that is loaded of may command light, luminous.
As shown in Figure 5, when process p * q clock, 16 clocks as previously discussed respond this load signal Load and enable signal En, and this row driver 129 is lighted the homochromy LED unit that this is loaded, and is lighted as the red LED unit.Whether and it is luminous to control the red LED unit that is loaded according to the value of red LED cell colors data b it1, bit2......bit16, and when color data bit is 0, the LED unit in the respective pixel will be not luminous; When color data bit was 1, this homochromy LED unit was with luminous in the respective pixel.
After this red LED unit is lighted, follow-up homochromy LED unit, as green LED unit, blue led unit lighted successively in an identical manner, luminous, thereby the LED unit of realizing different colours in each pixel is lighted successively.Therefore for luminous pixel, the LED unit of the different colours in this light emitting pixel is luminous successively, thereby make the LED of the different colours that this light emitting pixel is interior send the light of different colours continuously, constantly stimulate people's visual perception, thereby can effectively improve the stability of display frame vision.
In addition, in the present embodiment, as shown in Figure 4, this p * q pixel is arranged in the capable and q row of p, and on the direction of row and column, LED equidistantly arranges, and helps the heat radiation of LED.As optimal way, this line-spacing is identical with the row distance, thereby can further be beneficial to the heat radiation of LED; And this evenly distributed LED helps the realization of virtual pixel.
Fig. 6 and Figure 7 shows that second embodiment of the invention, it is similar to first embodiment, and difference is to have in each pixel two homochromy LED unit, and other elements are identical with first embodiment, and principle of work is also identical, needn't give unnecessary details at this.
In a second embodiment, each pixel comprises three LED unit, and wherein the red LED unit comprises the red LED of two series connection, and green LED unit and blue led unit comprise a green LED and a blue led respectively.Wherein identical among this green LED unit and blue led unit and first embodiment, needn't give unnecessary details at this.
Because the critical driving voltage of red LED is lower, even therefore two red LED are composed in series a red LED unit, driving voltage also can drive this two red LED.And, the lighting of this two red LED, luminous require identical, therefore, color data bit that can shared correspondence.Positive pole one end and corresponding line driver 121 connections of two red LED that therefore should series connection, 129 pairs of negative pole and row drivers should color data output terminal be connected, can realize that equally also the LED unit of different colours in each pixel is lighted successively.And under the situation that driving voltage allows, being not limited to the red LED series connection, other colors LED also can connect; And in the bigger situation of driving voltage, more homochromy LED can connect in a LED unit.
Equally, in the present embodiment, all single led being expert at and the arrangement of column direction equal intervals, and line-spacing is identical with the row distance, improves the LED radiating effect; And this evenly distributed LED helps the realization of virtual pixel.
It should be noted that, if each pixel comprises the high LED of two or more critical driving voltages, as green LED, this moment can be with its parallel connection, positive pole one end of the LED that this is in parallel connects with corresponding line driver 121,129 pairs of negative pole and row drivers should color data output terminal be connected, principle is identical with above-mentioned series connection, can realize that equally also the LED unit of different colours in each pixel is lighted successively.
Fig. 8 and Figure 9 shows that third embodiment of the invention, it implements different being with second, and this MCU directly produces look selection signal HselR, HselG and HselB, controls line driver 121,122,123 respectively, thereby can omit code translator 15 among second embodiment.This look selects the sequential of signal HselR, HselG and HselB shown in Figure 9, can directly be exported by this MCU, and it is identical with the effect of look gating signal SelR, SelG, SelB among first and second embodiment, needn't give unnecessary details at this.
Figure 10 uses identical label to Figure 12 shows that fourth embodiment of the invention with above embodiment components identical, needn't give unnecessary details at this; Be with the first embodiment difference: each pixel comprises the LED unit of four kinds of colors, also is red LED unit, green LED unit, blue led unit and White LED unit.Wherein this red LED unit, green LED unit, blue led unit and White LED unit comprise red LED, green LED, blue led and a White LED respectively, but be not limited thereto, but a plurality of homochromy LED of serial or parallel connection in each LED unit as required, more than describe in detail, needn't give unnecessary details at this.
The capable control signal Hsel ' of this MCU output comprises Hsel0, Hsel1, its waveform as shown in figure 12, thereby exportable four look gating signal SelR, SelG, SelB, SelW, the principle of work of three look gating signal SelR, SelG, SelB is identical among these four look gating signals and first embodiment, promptly can only have simultaneously one to be low level, all the other then are high level.The output terminal of this look gating signal SelW is connected with corresponding row driver 124 with operating voltage VCC, and this line driver 124 is identical with other line drivers 121,122,123, needn't give unnecessary details at this.The output terminal of this line driver 124 is connected with the positive pole of all White LEDs, and the output terminal that 129 pairs of the negative pole of LED and row drivers should color data in each pixel is connected.
During work, this MCU handles the information that will show, and exports this look and select signal Hsel ' and this clock signal C lk, load signal Load, enable signal En and data-signal Data.These two looks select signal Hsel0 ', Hsel1 ' through code translator 15, thereby produce four look gating signal SelR, SelG, SelB, SelW.These four look gating signal SelR, SelG, SelB, SelW can only have one to be low level simultaneously, and as SelR, remaining SelG, SelB, SelW then are high level.For example, when SelR is low level, as mentioned above, all red LED unit will be loaded, and promptly be connected to driving voltage on its positive pole, thereby be loaded.And, the homochromy LED unit output row control signal Rs of this MCU to being loaded, it is identical with first embodiment, needn't give unnecessary details at this.
As mentioned above, when through 16 clocks, respond this load signal Load and enable signal En, this row driver 129 is lighted the homochromy LED unit that this is loaded, and is lighted as the red LED unit.And whether according to the color data bit1 of red LED unit, the value of bit2......bit16, it is luminous to control the red LED unit that is loaded, and when color data bit is 0, the LED unit in the respective pixel will be not luminous; When color data bit was 1, this homochromy LED unit was with luminous in the respective pixel.
After this red LED unit is lighted, follow-up homochromy LED, as green LED, blue led, White LED lighted successively in an identical manner, luminous (sequential chart as shown in figure 12), can realize that equally also the LED unit of different colours in each pixel is lighted successively.In addition, in the 4th embodiment, as shown in figure 11, this p * q pixel is arranged in the capable and q row of p, and on the direction of row and column, LED equidistantly arranges, and helps the heat radiation of LED.As optimal way, this line-spacing is identical with the row distance, thereby can further be beneficial to the heat radiation of LED; And this evenly distributed LED helps the realization of virtual pixel.
Although the present invention is disclosed by above embodiment, but scope of the present invention is not limited thereto, under the condition that does not depart from the present invention's design, more than each element can replace with the similar or equivalent element that affiliated technical field personnel understand, line driver, row driver, code translator and control device can be finished by FPGA is integrated among for example above embodiment, also promptly are made in the FPGA.
Claims (10)
1. scan type LED display unit, it comprises control device, the several rows driver that is connected with operating voltage, row driver and display unit, this display unit comprises some pixels, each pixel is made up of some LED modules with different colors unit, it is characterized in that: the positive pole of same color LED unit and corresponding line driver connection in these some pixels, the output terminal that the negative pole of this same color LED unit is corresponding with this row driver connects, wherein this control device is according to the information output row control signal and the row control signal that will show, corresponding line driver and this row driver of control respectively makes that the LED unit of different colours is lighted successively in each pixel.
2. scan type LED display unit as claimed in claim 1 is characterized in that: the output terminal that the negative pole of all LED unit is corresponding with described row driver in described each pixel connects.
3. scan type LED display unit as claimed in claim 1 or 2 is characterized in that: at least one described LED unit comprises the two or more LEDs identical with its color, and wherein these two or more LED serial or parallel connections connect.
4. scan type LED display unit as claimed in claim 2, it is characterized in that: described capable control signal comprises look selection signal, this look selects signal to produce the look gating signal through code translator, the look gating signal output terminal of this code translator is connected with the corresponding row driver, drives described line driver successively.
5. scan type LED display unit as claimed in claim 2 is characterized in that: described capable control signal comprises look selection signal, and this look selects the output terminal of signal directly to be connected with the corresponding row driver, drives described line driver successively.
6. as claim 4 or 5 described scan type LED display units, it is characterized in that: described column signal comprises clock signal, load signal, enable signal and data-signal, wherein this data-signal comprises that correspondence is driven the color data of the homochromy LED unit of line driver connection, this clock signal moves on to described row driver with this color data string synchronously, respond this load signal and enable signal, correspondence is lighted this homochromy LED unit.
7. scan type LED display unit as claimed in claim 1 is characterized in that: described control device comprises MCU or FPGA.
8. scan type LED display unit as claimed in claim 7 is characterized in that: also comprise memory storage, this memory storage is connected with this MCU or FPGA.
9. scan type LED display unit as claimed in claim 1 is characterized in that: described some pixels are arranged, comprise several rows LED and some row LED, and this LED arranges at line direction and column direction equal intervals.
10. scan type LED display unit as claimed in claim 9 is characterized in that: described line-spacing is identical with described row distance.
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| CNA2006101698482A CN101025893A (en) | 2006-12-29 | 2006-12-29 | Scanning LED display device |
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| CN102542987A (en) * | 2011-12-29 | 2012-07-04 | 昆山维信诺显示技术有限公司 | Pixel drive circuit and display circuit |
| CN101971705B (en) * | 2008-03-27 | 2014-07-16 | 三菱电机株式会社 | Led backlight drive |
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| CN104919900A (en) * | 2012-12-17 | 2015-09-16 | 勒克斯维科技公司 | Smart pixel lighting and display microcontroller |
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| CN101281706A (en) * | 2008-04-16 | 2008-10-08 | 天津三维成像技术有限公司 | LED large scale freedom stereo display technique |
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| CN105185308A (en) * | 2015-09-24 | 2015-12-23 | 上海和辉光电有限公司 | Luminescence sequential control method for pixel circuit |
| CN110459537A (en) * | 2018-05-08 | 2019-11-15 | 亿光电子工业股份有限公司 | Display device |
| CN111028794A (en) * | 2018-10-10 | 2020-04-17 | 三星显示有限公司 | Display device |
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