CN102354482B - LED (light-emitting diode) display system and display method - Google Patents
LED (light-emitting diode) display system and display method Download PDFInfo
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Abstract
The invention relates to an LED (light-emitting diode) display system. The LED display system comprises an LED controller as well as N LED unit plates which are sequentially connected in series, wherein, LED drive circuits of the LED unit plates supply output current to LED lamps through a drive output end; and current setting modules of the LED drive circuits adjust the output current of the LED drive circuits according to control signals received by the LED drive circuits so as to realize one-bit or multi-bit gray levels. The invention further provides an LED display method. In the LED display system, by combining a conduction time control method with a current control method, concurrent control is carried out on the output current of the LED drive circuits through the control signals so as to realize quick setup of the output current of the LED drive circuits as well as one-bit or multi-bit gray levels and improve the refresh rate and gray level of the LED display system.
Description
Technical field
The present invention relates to LED display technique, particularly relate to a kind of refresh rate of the LED of raising display system and LED display system and the display packing of gray shade scale
Background technology
The brilliance control of LED lamp at present has two kinds of methods conventionally: electric current control method or ON time are controlled method.Described electric current control method, is to realize the brilliance control to LED lamp by the output current of LED drive circuit for adjusting, and the output current of LED drive circuit is regulated by certain step-length, and the luminosity of LED lamp just can be divided into several gray levels.Described ON time is controlled method, refers to employing constant-current driving LED, by controlling the ON time of LED lamp in the unit interval, realizes several gray levels.
And for the gray-scale Control of LED lamp, the LED display system extensively existing at present all adopts ON time to control method, and do not adopt electric current control method.
LED display system as shown in Figure 1, comprising:
A LED controller 1 and N the LED cell board 2 being connected in series successively;
Described LED cell board 2 comprises A LED drive circuit 5-1 ... 5-A, each LED drive circuit comprises B drive output;
Described LED drive circuit 5-1 ... 5-A provides output current to LED lamp by drive output;
Described LED controller 1 sends data-signal and control signal to each LED drive circuit 5-1 ... 5-A.
Particularly, the control signal that described LED controller 1 sends, the parallel all LED drive circuits 5 that offer LED cell board;
First LED drive circuit 5-1 of LED cell board 2 receives data-signal, first LED drive circuit 5-1 internal displacement register is exported to next LED drive circuit 5-2 by data-signal, transmit successively, last LED drive circuit 5-B outputs to data-signal first LED drive circuit of next stage LED cell board, wherein first order LED cell board obtains data-signal from LED controller, and LED unit, the second level and after this LED cell boards at different levels obtain data-signal from the drive output of last LED drive circuit of upper level LED cell board.
When drive output 6 (OutData) output low level of LED drive circuit 5, be the effective displaying time of LED, LED lamp is lit.
The following LED display system of take describes as example: one group of output of a LED controller is connected in series 8 LED cell boards successively, LED drive plate on every LED cell board comprises 2 LED drive circuits, each LED drive circuit comprises 16 LED drive output OutData, LED drive output OutData adds up to 256, each LED drive output connects a LED lamp, has 256 LED lamps; Suppose that LED gray shade scale is 4096 grades, gray scale is 12; With array D[0:11] represent 12 gray-scale values of the LED lamp that arbitrary LED drive output drives, as D[0] represent the lowest order gray-scale value of 12 gray scales of the LED lamp that LED drive output will drive.
The control signal that LED controller sends as shown in Figure 3.T represents the cycle of clock signal clk, and T_FRAM represents that 12 gray-scale values of 256 LED drive output OutData once show required T.T.; Each LED lamp need to obtain the effective displaying time of corresponding LED according to the gray scale of the pixel of shown image in a T_FRAM.The corresponding effectively displaying time of gray-scale value lowest order is a clock period T, and effective displaying time of each correspondence of 12 gray-scale values is respectively from a high position to low level: 8 * 256T, 4 * 256T, 2 * 256T, 256T, 128T, 64T, 32T, 16T, 8T, 4T, 2T, T.Due to LED drive circuit output terminal, OutData adds up to 256, the shift time that each gray-scale value needs is 256T, so gray scale least-significant byte D[0:7] enable signal need to fill effective time and to meet the required effective shift time 256T that is once shifted ineffective time.Concrete corresponding effective displaying time and T.T. of gray level bit, as shown in table 1:
Table 1
12 gray-scale values have all shown that needed T.T. T_FRAM is:
8 * 256T+4 * 256T+2 * 256T+256T+256T+256T+256T+256T+256T+256T+256T+256T, amounts to 23 * 256T;
The refresh rate of this LED display system is: 1/ (23 * 256T).
If wish, improve picture quality, need LED display system to there is higher refresh rate and gray shade scale.From above-mentioned calculating, can find out: when the gray shade scale of LED display system requires when higher, needed T.T. of the complete demonstration of gray-scale value will improve greatly, can significantly reduce the refresh rate of LED display, affect the display effect of LED display.
Improve the refresh rate of LED display system and the cycle T that gray shade scale can reduce clock signal, but the raising of clock signal frequency is by system hardware being proposed to higher requirement, will inevitably increase hardware cost.
If LED display system adopts ON time control to add Current Control, carry out LED brilliance control, can improve gray shade scale and refresh rate simultaneously, make LED display system possess better performance index and display effect.
Particularly, low level adopts electric current control method, and a high position still adopts ON time to control method.Suppose, this system possesses 2 digit current set-up functions, effective displaying time and the T.T. of each correspondence of 12 gray scales, and can be as shown in table 2 below.
Table 2
Wherein, effectively displaying time is the effective time of EN signal.
Wherein, D[2:11] electric conduction flow valuve in ON time is i, D[1] electric conduction flow valuve be i/2, D[0] electric conduction flow valuve be i/4.
12 gray-scale values all show that complete needed T.T. T_FRAM is:
2 * 256T+256T+256T+256T+256T+256T+256T+256T+256T+256T+256T+2 56T, amounts to 13 * 256T;
The refresh rate of LED display can be increased to: 1/ (13 * 256T).
Such scheme can improve refresh rate under same gray shade scale, makes LED system have better display performance.But the few system of LED display system extensively existing at present possesses Current Control function.Even if there is the system of Current Control function, be generally to offer LED drive circuit by data-signal successively serial communication, need to expend longer call duration time, and only be used as the adjusting of display screen overall brightness, and not for realizing gray scale.
Particularly, the LED system at present with Current Control function, it is to realize by a status register of LED drive circuit 5 inside is set that its electric current arranges function, and the setting up procedure of this register is consistent with the transmitting procedure of gradation data, and electric current setting need to be expended the longer time.If the LED display system of above-mentioned 12 gray-scale values possesses this kind of electric current, function is set, there is the status register of its LED drive circuit 5 inside, by changing the value of this register, can realize electric current setting, according to table 2, adopt ON time to control to add the process that current control scheme carries out gray-scale Control should be: D[11], D[10], D[9], D[8], D[7], D[6], D[5], D[4], D[3], D[2], status register setup times, D[1], status register setup times, D[0].Wherein, the identical 256T of being of time of the time that status register setting once spent and 1 gradation data transmission, T_FRAM T.T. is 15 * 256T.
Summary of the invention
The object of the invention is in order to overcome the deficiencies in the prior art, a kind of LED display system and display packing are proposed, this LED display system and display packing are controlled in ON time on the basis of method in conjunction with electric current control method, by control signal to each LED drive circuit output current carry out parallel control, realize the quick-setting of the output current of LED drive circuit, realize one or more LED gray scales, improve refresh rate and the gray shade scale of LED display system.
LED display system, comprising:
A LED controller and N the LED cell board being connected in series successively;
Described each LED cell board comprises A LED drive circuit, and each LED drive circuit comprises B drive output;
Described each LED drive circuit provides output current to LED lamp by drive output;
Described LED controller sends data-signal and control signal to each LED drive circuit;
Described each LED drive circuit is controlled in ON time on the basis of method in conjunction with electric current control method, by described control signal, the output current of each LED drive circuit is carried out to parallel control, described each LED drive circuit comprises that an electric current arranges module, described electric current arranges the described control signal that module receives according to LED drive circuit, the output current of LED drive circuit for adjusting, realizes the one or more gray scales of LED lamp;
Further, the gray scale of LED lamp is H position, with array D[0:(H-1)] represent the H position gray-scale value of arbitrary LED lamp, wherein the low n of gray-scale value (n≤m) bit gray-scale value is expressed as D[0:(n-1)], higher bit position gray-scale value is expressed as D[n:(H-1)], by described electric current, module is set by gray-scale value D[0:(n-1)] output current is adjusted to I/2 successively
n, I/2
n-1i/2, makes D[0:(n-1)] effective displaying time be T; And higher bit position gray-scale value D[n:(H-1)] output current size all remains I, makes D[n:(H-1)] effective displaying time be followed successively by T, 2T, 4T ... 2
h-1-nt.
Further, described control signal offers each LED drive circuit by parallel mode, realizes the quick-setting of the output current of LED drive circuit.
Further, described output current is I/2
m, wherein I is the reference current of LED drive circuit drive output, m is integer.
Further, the described control signal that module receives is set is clock signal and latch signal to the electric current of described each LED drive circuit.
LED display packing, comprising:
Step 1, LED controller send data-signal and control signal to each LED drive circuit of LED cell board;
LED drive circuit in step 2, LED cell board receives described data-signal and control signal, LED drive circuit is according to described control signal, described each LED drive circuit is controlled in ON time on the basis of method in conjunction with electric current control method, by described control signal to each LED drive circuit output current carry out parallel control, the output current of LED drive circuit for adjusting, realizes the one or more gray scales of LED lamp;
Further, the gray scale of LED lamp is H position, with array D[0:(H-1)] represent the H position gray-scale value of arbitrary LED lamp, wherein the low n of gray-scale value (n≤m) position gray-scale value is expressed as D[0:(n-1)], higher bit position gray-scale value is expressed as D[n:(H-1)], by low bit gray-scale value D[0:(n-1)] output current is adjusted to I/2 successively
n, I/2
n-1i/2, makes D[0:(n-1)] effective displaying time be T; And higher bit position gray-scale value D[n:(H-1)] output current size all remains I, makes D[n:(H-1)] effective displaying time be followed successively by T, 2T, 4T ... 2
h-1-nt.
Further, described control signal offers each LED drive circuit by parallel mode, realizes the quick-setting of the output current of LED drive circuit.
Further, described output current is I/2
m, wherein I is the reference current of LED drive circuit drive output, m is integer.
Beneficial effect of the present invention is: the LED drive circuit of the LED drive system that the present invention proposes is controlled in ON time on the basis of method in conjunction with electric current control method, by control signal to each LED drive circuit output current carry out parallel control, realize the quick-setting of the output current of LED drive circuit, realize one or more LED gray scales.When the gray shade scale of LED display system is had relatively high expectations, can significantly reduce needed T.T. of the complete demonstration of gray-scale value, improve the refresh rate of LED display system simultaneously, improve performance index and the display effect of LED display system.
Accompanying drawing explanation
Fig. 1 is LED display system architectures schematic diagram;
Fig. 2 has the LED drive circuit schematic diagram that electric current arranges function;
Fig. 3 is the signal timing diagram that in ON time control program, LED controller sends;
Fig. 4 has the signal timing diagram that in the LED display system of fast current setting, LED controller sends.
Embodiment
Below in conjunction with accompanying drawing, content of the present invention is further illustrated.
LED display system, as shown in Figure 1, comprising:
A LED controller 1 and N the LED cell board 2 being connected in series successively;
Described LED cell board 2 comprises A LED drive circuit 5-1 ... 5-A, each LED drive circuit comprises B drive output Outdata;
Described LED drive circuit 5-1 ... 5-A provides output current to LED lamp by drive output Outdata;
Described LED controller 1 sends data-signal Data and control signal to each LED drive circuit 5-1 ... 5-A, described control signal, comprises clock signal clk, latch signal LAT, enable signal EN;
The control signal that described LED controller 1 sends, the parallel all LED drive circuits 5 that offer LED cell board;
First LED of LED cell board 2 drives road 5-1 to receive data-signal, first LED drive circuit 5-1 internal displacement register is exported to next LED drive circuit 5-2 by data-signal, transmit successively, last LED drive circuit 5-B outputs to data-signal first LED drive circuit of next stage LED cell board, wherein first order LED cell board obtains data-signal from LED controller, and LED unit, the second level and after this LED cell boards at different levels obtain data-signal from the drive output of last LED drive circuit of upper level LED cell board.
Described LED drive circuit 5 comprises that an electric current as shown in Figure 2 arranges module, and described electric current arranges the described control signal that module receives according to LED drive circuit, and the output current of LED drive circuit for adjusting is realized the one or more gray scales of LED lamp.
As shown in Figure 2, the electric current of described LED drive circuit arranges module to receive described control signal is clock signal clk and latch signal LAT.
Described output current is I/2
m, wherein I is the reference current of LED drive circuit drive output, m is integer.
The gray scale of LED lamp is H position, with array D[0:(H-1)] represent the H position gray-scale value of arbitrary LED lamp, wherein the low n of gray-scale value (n≤m) position gray-scale value is expressed as D[0:(n-1)], higher bit position gray-scale value is expressed as D[n:(H-1)], by described electric current, module is set by gray-scale value D[0:(n-1)] output current is adjusted to I/2 successively
n, I/2
n-1i/2, makes D[0:(n-1)] effective displaying time be T; And higher bit position gray-scale value D[n:(H-1)] output current size all remains I, makes D[n:(H-1)] effective displaying time be followed successively by T, 2T, 4T ... 2
h-1-nt.
The following LED display system of take describes as example: one group of output of a LED controller 1 is connected in series N successively as 8 LED cell boards 2, on every LED cell board 2, comprise 2 LED drive circuits, each LED drive circuit comprises 16 drive output OutData, LED drive output OutData sum N * A * B is 256, each LED drive output connects a LED, has 256 LED.
It is that the fast current of 2 arranges function that each driving circuit has m; Take LED lamp gray shade scale as 4096 grades, gray scale be 12 for example; With array D[0:(H-1)] represent 12 gray-scale values of the LED that arbitrary LED drive output drives, as D[0] represent the lowest order gray-scale value of 12 gray scales of the LED that LED drive output OUT will drive.
The ON time proposing according to the present invention is controlled and is added the scheme that Current Control realizes gray-scale Control, and effective displaying time of each correspondence of 12 gray scales, every gray scale is consuming time and the output current of LED drive circuit, can be as shown in table 3 below.
Table 3
The control signal that LED controller sends as shown in Figure 4.Data is data-signal, and clock signal clk, latch signal LAT, enable signal EN are control signal, and Outdata is LED drive circuit output terminal; T represents the cycle of clock signal clk, supposes that minimum EN effective time is T, and T_FRAM represents that 12 gray-scale values of 256 LED drive output OutData once show required T.T.; Adopting the D[1 of Current Control], D[0] before bit data transmission, with latch signal LAT significant level, comprise 2 CLK clock signals and represent that electric current is set to I/2, with latch signal LAT significant level, comprise 3 CLK clock signals and represent that electric current is set to I/4, with latch signal LAT significant level, comprise 1 CLK clock signal and represent that electric current is set to I;
It is very short that above-mentioned electric current arranges needed T.T., is only 5T, and 12 gray-scale values all show that complete needed T.T. T_FRAM is:
2 * 256T+256T+256T+256T+256T+256T+256T+256T+256T+256T+256T+2 56T+5T, amounts to 13 * 256T+5T; Significantly improved the refresh rate of LED display system.
What should be understood that is; above-described embodiment is just to explanation of the present invention; rather than limitation of the present invention; any innovation and creation that do not exceed within the scope of connotation of the present invention; for example, within the figure place that, change gray-scale value figure place and output current are controlled and the variation of output current etc. all fall into protection domain of the present invention.
Claims (5)
1.LED display system, comprising:
A LED controller and N the LED cell board being connected in series successively;
Each LED cell board comprises A LED drive circuit, and each LED drive circuit comprises B drive output;
Described each LED drive circuit provides output current to LED lamp by drive output;
Described LED controller sends data-signal and control signal to each LED drive circuit;
It is characterized in that, described each LED drive circuit is controlled in ON time on the basis of method in conjunction with electric current control method, by described control signal, the output current of each LED drive circuit is carried out to parallel control, described each LED drive circuit comprises that an electric current arranges module, described electric current arranges the described control signal that module receives according to LED drive circuit, the output current of LED drive circuit for adjusting, realizes the one or more gray scales of LED lamp; The gray scale of LED lamp is H position, with array D[0:(H-1)] represent the H position gray-scale value of arbitrary LED lamp, wherein the low n bit of gray-scale value gray-scale value is expressed as D[0:(n-1)], higher bit position gray-scale value is expressed as D[n:(H-1)], by described electric current, module is set by gray-scale value D[0:(n-1)] output current is adjusted to I/2 successively
n, I/2
n-1i/2, makes D[0:(n-1)] effective displaying time be T; And higher bit position gray-scale value D[n:(H-1)] output current size all remains I, makes D[n:(H-1)] effective displaying time be followed successively by T, 2T, 4T ... 2
h-1-nt, wherein I is the reference current of LED drive circuit drive output.
2. LED display system as claimed in claim 1, is characterized in that:
Described control signal offers each LED drive circuit by parallel mode, realizes the quick-setting of the output current of LED drive circuit.
3. LED display system as claimed in claim 2, is characterized in that: it is clock signal and latch signal that the electric current of described each LED drive circuit arranges the described control signal that module receives.
4.LED display packing, is characterized in that comprising:
Step 1, LED controller send data-signal and control signal to each LED drive circuit of LED cell board;
LED drive circuit in step 2, LED cell board receives described data-signal and control signal, LED drive circuit is according to described control signal, in ON time, control on the basis of method in conjunction with electric current control method, by described control signal to each LED drive circuit output current carry out parallel control, the output current of LED drive circuit for adjusting, realizes the one or more gray scales of LED lamp;
The gray scale of LED lamp is H position, with array D[0:(H-1)] represent the H position gray-scale value of arbitrary LED lamp, wherein the low n of gray-scale value position gray-scale value is expressed as D[0:(n-1)], higher bit position gray-scale value is expressed as D[n:(H-1)], by low bit gray-scale value D[0:(n-1)] output current is adjusted to I/2 successively
n, I/2
n-1i/2, makes D[0:(n-1)] effective displaying time be T; And higher bit position gray-scale value D[n:(H-1)] output current size all remains I, makes D[n:(H-1)] effective displaying time be followed successively by T, 2T, 4T ... 2
h-1-nt, wherein I is the reference current of LED drive circuit drive output.
5. LED display packing as claimed in claim 4, is characterized in that:
Described control signal offers each LED drive circuit by parallel mode, realizes the quick-setting of the output current of LED drive circuit.
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| CN102682700B (en) * | 2012-05-16 | 2016-02-24 | 深圳市摩西尔电子有限公司 | A kind of LED constant current driving chip and output current control method thereof |
| WO2013170460A1 (en) * | 2012-05-16 | 2013-11-21 | 深圳市摩西尔电子有限公司 | Led display screen constant current drive control system and output current control method therefor |
| CN102682701B (en) * | 2012-05-16 | 2016-09-21 | 深圳市摩西尔电子有限公司 | A kind of LED display constant-current driving control system and output current control method thereof |
| CN102737583B (en) * | 2012-07-09 | 2015-06-17 | 深圳市磊芯半导体有限公司 | LED (Light Emitting Diode) driving constant current channel output driver, cascading system and driving method of LED driving constant current channel output driver and cascading system |
| CN103857106B (en) * | 2012-11-29 | 2016-05-18 | 利亚德光电股份有限公司 | Led drive circuit and control system |
| CN103021342B (en) * | 2013-01-05 | 2015-07-15 | 深圳市九洲光电科技有限公司 | Method for increasing LED display refresh rate |
| CN103310733B (en) * | 2013-06-24 | 2016-10-12 | 深圳市明微电子股份有限公司 | A kind of LED driving method supporting many packets to latch and system |
| CN104424884B (en) * | 2013-09-06 | 2017-04-05 | 杭州视芯科技有限公司 | Display system and its gradation display method, device |
| CN107403603B (en) * | 2017-09-22 | 2020-03-17 | 深圳市云智科技有限公司 | Control circuit of LED scanning display screen |
| CN110599945B (en) * | 2019-08-06 | 2020-10-30 | 北京集创北方科技股份有限公司 | LED display device and driving method thereof |
| TWI740715B (en) * | 2020-11-16 | 2021-09-21 | 明陽半導體股份有限公司 | Grayscale generating circuit and method |
| CN113554980B (en) * | 2021-09-22 | 2021-12-03 | 南京浣轩半导体有限公司 | LED driving current modulation method, system and application |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141210 Termination date: 20211107 |