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Charge control method and device for LED driving circuit, LED driving circuit
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A technology of LED drive and charge control, which is applied in the direction of lamp circuit layout, lighting device, electric light source, etc., and can solve problems such as long high-definition distance, crosstalk of LED display screen, lack of control of parasitic capacitance, etc.
Active Publication Date: 2015-11-25
SHENZHEN GREEN WELLSPRING SEMICON TECH
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Description
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Problems solved by technology
However, in order to achieve a high refresh rate and a large size, the LED display screen produced by the existing technology often has to sacrifice the clarity of the image display, which will be farther and farther away from high-definition
The main reason for the deterioration of the above-mentioned image clarity is that in the prior art, there are parasitic capacitances in the row lines and column lines of the LED display screen during the working process, and the parasitic capacitance of the existing LED driving circuit in the row scanning process The charge on the capacitor cannot be effectively controlled, that is, when the line scan ends, due to the existence of parasitic capacitance, the line display will not disappear immediately, and at this time, the next line scan will be generated immediately. , The phenomenon of crosstalk between downlinks, if this situation is ignored, even if a high refresh rate display is realized, the clarity of the image displayed on the entire LED display will be seriously affected
Therefore, limited by the lack of control of parasitic capacitance in the existing LED drive circuit, the prior art cannot fully meet the requirements of high refresh rate and large size at the same time to ensure high-definition display
Method used
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Embodiment 1
[0024] During the scanning interval between every two rows of the LED display, the charge elimination process is performed according to the enable signal.
[0025] In this embodiment, by setting the "enabling signal" as the basis for executing the charge elimination process, the execution of the charge elimination process can be more controllable. The specific control methods can be selected according to actual needs, including but not limited to the following methods:
[0026] (1) Execute the charge elimination process when there is an enabling signal, and stop the control method of the charge elimination process if there is no;
[0027] (2) The charge elimination process is started when the enable signal is received for the first time, and the charge elimination process is stopped when the enable signal is received again.
Embodiment 2
[0029] The execution time of the above-mentioned charge elimination process is less than the scanning time gap between every two rows of the LED display screen.
[0030] Usually, the execution time of the charge elimination process can be equivalent to the scanning time gap of every two lines of driving the LED display screen, and in this embodiment, this time can also be as short as the scanning time gap of every two lines of driving the LED display screen. The length should be adjusted according to the final display effect of the LED display to achieve the best display effect.
Embodiment 3
[0032] In the step S3, charge elimination is realized by pulling up the voltage of the output terminal.
[0033] This embodiment provides a specific method for charge elimination, that is, by pulling up the voltage of the output terminal (such as straightening the power supply voltage), so that even if there is a parasitic capacitance on each row of the LED display screen connected to the output terminal, its relative There is no longer a voltage difference at the output end, so that the purpose of charge elimination is realized. In practice, according to different situations, there may also be a method of lowering the voltage to achieve charge elimination, which will not be described in detail here.
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Abstract
The invention provides a charge control method and device applied to an LED drive circuit and the LED drive circuit. In the LED drive circuit, in the scanning time gap between every two lines of an LED display screen, constant current turn-off voltage which descends slowly is detected in real time, once the constant current turn-off voltage is lower than preset voltage, charge elimination is carried out on the output end of the LED drive circuit, and therefore the problem of display persistence due to the fact that a stray capacitor discharges in the line scanning gap is effectively solved, the phenomenon of crosstalk between uplink and downlink of the LED display screen under high refresh rate to the traditional significance is avoided, and the requirement for high-definition display under the conditions of high refresh rate and large size can be met.
Description
technical field [0001] The invention relates to the field of LED display driving, in particular to a charge control method and device for an LED driving circuit, and an LED driving circuit. Background technique [0002] As LED displays are more and more widely used in our daily life and work, people's requirements for LED displays are getting higher and higher. In the field of high-end display screens, high refresh rate, high definition and large size are important Requested by most users. However, in order to achieve a high refresh rate and a large size, the LED display screen produced by the existing technology often has to sacrifice the clarity of the image display, which will be farther and farther away from high-definition. The main reason for the deterioration of the above-mentioned image clarity is that in the prior art, there are parasitic capacitances in the row lines and column lines of the LED display screen during the working process, and the parasitic capacitan...
Claims
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Application Information
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