CN113573440B - LED drive circuit and LED display device - Google Patents
LED drive circuit and LED display device Download PDFInfo
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- CN113573440B CN113573440B CN202010357400.3A CN202010357400A CN113573440B CN 113573440 B CN113573440 B CN 113573440B CN 202010357400 A CN202010357400 A CN 202010357400A CN 113573440 B CN113573440 B CN 113573440B
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Abstract
The application discloses LED drive circuit includes: the LED control circuit is used for converting the first PWM signal, the first DAC signal and the Gamma signal into a second PWM signal and a second DAC signal; the constant current source is used for supplying power to the target LED according to the second PWM signal; and the current DAC is used for converting the second DAC signal into a corresponding current signal and supplying power to the target LED by using the current signal auxiliary constant current source. Obviously, compared with the prior art, the LED driving circuit can avoid the process of adjusting the depth of the second PWM signal for controlling the constant current source, so the energy consumed by the LED driving circuit can be obviously reduced by the arrangement mode, and the aim of adjusting the luminous efficiency of the LED can be achieved by using the LED driving circuit.
Description
Technical Field
The invention relates to the technical field of LED control, in particular to an LED driving circuit and an LED display device.
Background
In practical applications, application scenarios in which LEDs are controlled by LED driving circuits are often encountered. Referring to fig. 1, fig. 1 is a block diagram of an LED driving circuit in the prior art. In the LED driving circuit, the LED control circuit generates a corresponding PWM signal to the constant current source after receiving the PWM signal and the Gamma signal, so that the constant current source supplies power to the LED. Wherein the brightness of the LED is proportional to the ILED, i.e. the ILED is adjusted according to the PWM signal controlling the constant current source, assuming a depth of [ j-1, 0]]The ILED can be changed in size by the Gamma signal [ i-1, 0] in the LED control circuit]And (5) adjusting. Referring to fig. 2, fig. 2 is a graph showing the brightness of light of the LED at three different Gamma values. When the PWM signal is used to control the light emitting efficiency of the LED, the light emitting brightness of the LED may be expressed as:from this expression, it follows that: the luminous efficiency of the LED is completely determined by the depth jbit of the PWM signal, while the step current ILED of ILED step The expression is: />Step current ILED if ILED step Smaller indicates better luminous efficiency of the LED. In this case, the light emitting efficiency of the LED can be adjusted only by increasing the depth of the PWM signal, but since a large amount of power is consumed to adjust the depth of the PWM signal, a large amount of power is consumed by the LED driving circuit. Currently, there is no more effective solution to this technical problem.
Therefore, how to improve the luminous efficiency of the LED in the LED driving circuit and reduce the energy consumed by the LED driving circuit is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an LED driving circuit and an LED display device, which can improve the light emitting efficiency of LEDs in the LED driving circuit and reduce the energy consumption of the LED driving circuit. The specific scheme is as follows:
an LED driving circuit comprising:
the LED control circuit is used for converting the first PWM signal, the first DAC signal and the Gamma signal into a second PWM signal and a second DAC signal;
the constant current source is used for supplying power to the target LED according to the second PWM signal;
and the current DAC is used for converting the second DAC signal into a corresponding current signal and assisting the constant current source to supply power to the target LED by utilizing the current signal.
Preferably, the current-mode DAC is specifically a binary weighted current-mode DAC.
Preferably, the constant current source and the current DAC are commonly connected to the negative electrode of the target LED, and the positive electrode of the target LED is connected to VCC.
Preferably, the constant current source and the current DAC are commonly connected to the positive electrode of the target LED, and the negative electrode of the target LED is grounded.
Preferably, the constant current source is specifically a field effect transistor constant current source.
Preferably, the field-effect transistor constant current source includes: the first MOS tube, the second MOS tube and the third MOS tube;
the emitter of the first MOS tube is connected with the transformer, the collector of the first MOS tube is grounded, the grid of the first MOS tube is connected with the grid of the second MOS tube, the collector of the second MOS tube is grounded, the emitter of the first MOS tube is also connected with a connecting wire between the grid of the first MOS tube and the grid of the second MOS tube, the emitter of the second MOS tube is connected with the collector of the third MOS tube, the grid of the third MOS tube is used for receiving the first PWM signal, and the emitter of the third MOS tube is used for outputting the second PWM signal.
Correspondingly, the invention also discloses an LED display device which comprises the LED driving circuit disclosed in the specification.
Therefore, in the LED driving circuit provided by the invention, the constant current source and the current DAC are used for supplying power to the target LED, so that the luminous efficiency of the target LED can be controlled by the constant current source and the current DAC together, and the luminous efficiency of the target LED can be improved by improving the depth of the second DAC signal for controlling the current DAC under the condition that the depth of the second PWM signal for fixing the constant current source control signal is unchanged. Obviously, compared with the prior art, the LED driving circuit can avoid the process of adjusting the depth of the second PWM signal for controlling the constant current source, so that the energy consumed by the LED driving circuit can be obviously reduced by the arrangement mode, and the aim of adjusting the luminous efficiency of the LED can be also achieved. Correspondingly, the LED display device disclosed by the invention has the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a prior art LED driver circuit;
FIG. 2 is a graph of the brightness of light from an LED at three different Gamma values;
fig. 3 is a block diagram of an LED driving circuit according to an embodiment of the present invention;
FIG. 4 is a graph of LED light brightness when the Gamma signal is 2.8, which is drawn by the LED driving circuit according to the embodiment of the invention;
fig. 5 is a graph of curve error between LED light brightness and ideal LED light brightness when Gamma signal drawn by the LED driving circuit according to the embodiment of the present invention is 2.8.
FIG. 6 is a block diagram of a binary weighted current DAC according to an embodiment of the present invention;
FIG. 7 is a block diagram of another LED driving circuit according to an embodiment of the present invention;
FIG. 8 is a block diagram of another LED driver circuit according to an embodiment of the present invention;
fig. 9 is a block diagram of a constant current source of a field effect transistor according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 3, fig. 3 is a block diagram of an LED driving circuit according to an embodiment of the present invention, where the LED driving circuit includes:
the LED control circuit is used for converting the first PWM signal, the first DAC signal and the Gamma signal into a second PWM signal and a second DAC signal;
the constant current source is used for supplying power to the target LED according to the second PWM signal;
and the current DAC is used for converting the second DAC signal into a corresponding current signal and supplying power to the target LED by using the current signal auxiliary constant current source.
In the present embodiment, a novel LED driving circuit is provided, by which not only the light emitting efficiency of an LED can be improved, but also the energy required to be consumed by the LED driving circuit can be reduced. Specifically, in the LED driving circuit provided in this embodiment, the LED control circuit is first utilized to convert the first PWM signal, the first DAC signal and the Gamma signal into the second PWM signal and the second DAC signal, and then the constant current source can supply power to the target LED under the triggering action of the second PWM signal.
It can be understood that, in the LED driving circuit provided in this embodiment, the constant current source and the current DAC are used to supply power to the target LED together, so that the light emitting efficiency of the target LED can be improved by increasing the depth of the second DAC signal while the depth of the second PWM signal is fixed.
Here, by way of a specific example, assuming that the depth of the second PWM for controlling the constant current source is [ n-1,0] and the depth of the second DAC for controlling the current DAC is [ m-1,0], the light emission luminance ILED of the target LED in this case can be expressed as:
from the expression of the luminance ILED of the target LED, the luminance ILED of the target LED is PWM And ILED (ed) DAC Two parts, wherein the ILED DAC Is tied up withIndependent of system frequency, and step current ILED step The expression of (2) is:by step current ILED step The expression of (2) can be found: the gray-scale resolution of the target LED is determined by the depth of the second PWM signal and the depth of the second DAC signal, and in this case, if the light emission luminance of the target LED is to be increased, the light emission efficiency of the target LED can be improved by increasing the depth of the second DAC signal while fixing the depth of the second PWM signal.
Referring to fig. 4 and fig. 5, fig. 4 is a graph of brightness of LED light when a Gamma signal drawn by the LED driving circuit according to the embodiment of the present invention is 2.8; fig. 5 is a graph of curve error between LED light brightness and ideal LED light brightness when Gamma signal drawn by the LED driving circuit according to the embodiment of the present invention is 2.8. As can be seen from fig. 4 and 5, the LED driving circuit provided by the present embodiment can reduce the error of the light emitting efficiency of the target LED to below 0.16% at low gray level, and control the error of the light emitting efficiency of the target LED to about zero at high gray level.
Obviously, in the LED driving circuit provided in this embodiment, since the light emitting brightness of the target LED can be improved without changing the depth of the PWM signal for controlling the constant current source, the energy required to be consumed by the LED driving circuit can be significantly reduced. That is, by the LED driving circuit provided in this embodiment, not only the purpose of improving the luminous efficiency of the target LED can be achieved, but also the energy consumed by the LED driving circuit can be significantly reduced.
Therefore, in the LED driving circuit provided in this embodiment, the constant current source and the current DAC are used to supply power to the target LED, so that the light emitting efficiency of the target LED can be controlled by the constant current source and the current DAC together, and thus the light emitting efficiency of the target LED can be improved by increasing the depth of the second DAC signal for controlling the current DAC under the condition that the depth of the second PWM signal for controlling the constant current source control signal is unchanged. Obviously, compared with the prior art, the LED driving circuit can avoid the process of adjusting the depth of the second PWM signal for controlling the constant current source, so that the energy consumed by the LED driving circuit can be obviously reduced by the arrangement mode, and the aim of adjusting the luminous efficiency of the LED can be also achieved.
Based on the above embodiments, the present embodiment further describes and optimizes the technical solution, and as a preferred implementation manner, the current DAC is specifically a binary weighted current DAC.
Referring to fig. 6, fig. 6 is a block diagram of a binary weighted current DAC according to an embodiment of the invention. In this embodiment, the current DAC is set to be a binary weighted current DAC, and since the binary weighted current DAC has the advantages of simple structure and reliable operation, and the binary weighted current DAC also has the advantage of small occupied area, when the current DAC is set to be a binary weighted current DAC, the space occupied by the current DAC for the LED driving circuit can be relatively reduced.
Based on the above embodiments, the technical solution is further described and optimized in this embodiment, please refer to fig. 7, fig. 7 is a block diagram of another LED driving circuit provided in the embodiment of the present invention. As a preferred embodiment, the constant current source and the current DAC are commonly connected to the negative electrode of the target LED, and the positive electrode of the target LED is connected to VCC.
In this embodiment, the target LED and the LED driving circuit are configured as shown in fig. 7, that is, the voltage difference between VCC and the LED driving circuit is used to supply power to the target LED, so that stability and reliability of the target LED in use are ensured.
Based on the above embodiments, the technical solution is further described and optimized in this embodiment, please refer to fig. 8, fig. 8 is a block diagram of another LED driving circuit according to an embodiment of the present invention. As a preferred embodiment, the constant current source and the current DAC are commonly connected to the positive electrode of the target LED, and the negative electrode of the target LED is grounded.
In practical application, the target LED and the LED driving circuit may be set in a structural form as shown in fig. 8, that is, the normal working performance of the target LED is ensured by using the voltage difference between the LED driving circuit and the ground, so that the structural form of the LED driving circuit provided by the application is more flexible and various.
Based on the above embodiments, the technical solution is further described and optimized in this embodiment, and as a preferred implementation manner, the constant current source is specifically a field effect transistor constant current source.
In this embodiment, the constant current source is set as the field-effect transistor constant current source, and because the field-effect transistor constant current source has the characteristic of high constant current precision, and the field-effect transistor constant current source also has the advantages of simple and reliable peripheral setting circuit, the construction complexity of the LED driving circuit can be further reduced when the constant current source is set as the field-effect transistor constant current source.
Referring to fig. 9, fig. 9 is a block diagram of a constant current source of a field effect transistor according to an embodiment of the present invention. As a preferred embodiment, the fet constant current source includes: the first MOS transistor N1, the second MOS transistor N2 and the third MOS transistor N3;
the emitter of the first MOS tube N1 is connected with the transformer, the collector of the first MOS tube N1 is grounded, the grid of the first MOS tube N1 is connected with the grid of the second MOS tube N2, the collector of the second MOS tube N2 is grounded, the emitter of the first MOS tube N1 is also connected with a connecting wire between the grid of the first MOS tube N1 and the grid of the second MOS tube N2, the emitter of the second MOS tube N2 is connected with the collector of the third MOS tube N3, the grid of the third MOS tube N3 is used for receiving the first PWM signal, and the emitter of the third MOS tube N3 is used for outputting the second PWM signal.
Specifically, in this embodiment, the fet constant current source is set in the structural form as shown in fig. 9, and it is obvious that, since only three MOS transistors are used in the fet constant current source, the fet constant current source can provide stable current output for the target LED, so that not only the structural complexity of the fet constant current source can be reduced, but also the cost required by the fet constant current source can be relatively reduced.
Correspondingly, the embodiment of the invention also discloses an LED display device which comprises the LED driving circuit disclosed in the specification.
The LED display device provided by the embodiment of the invention has the beneficial effects of the LED drive circuit disclosed by the embodiment of the invention.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description of an LED driving circuit and an LED display device provided by the present invention has been made in detail, and specific examples are applied herein to illustrate the principles and embodiments of the present invention, the above examples are only for helping to understand the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (7)
1. An LED driving circuit, comprising:
the LED control circuit is used for converting the first PWM signal, the first DAC signal and the Gamma signal into a second PWM signal and a second DAC signal;
the constant current source is used for supplying power to the target LED according to the second PWM signal;
the current DAC is used for converting the second DAC signal into a corresponding current signal and assisting the constant current source to supply power to the target LED by utilizing the current signal;
the process of using the current signal to assist the constant current source in powering the target LED includes:
and the constant current source and the current type DAC are used for supplying power to the target LED, and the luminous efficiency of the target LED is improved by improving the depth of the second DAC signal under the condition that the depth of the second PWM signal is fixed.
2. The LED driving circuit according to claim 1, wherein the current-mode DAC is in particular a binary weighted current-mode DAC.
3. The LED driving circuit according to claim 1, wherein the constant current source and the current DAC are commonly connected to a negative electrode of the target LED, and a positive electrode of the target LED is connected to VCC.
4. The LED driving circuit according to claim 1, wherein the constant current source and the current DAC are commonly connected to an anode of the target LED, and a cathode of the target LED is grounded.
5. LED driving circuit according to any of the claims 1 to 4, characterized in that the constant current source is in particular a field effect transistor constant current source.
6. The LED driving circuit of claim 5, wherein said fet constant current source comprises: the first MOS tube, the second MOS tube and the third MOS tube;
the emitter of the first MOS tube is connected with the transformer, the collector of the first MOS tube is grounded, the grid of the first MOS tube is connected with the grid of the second MOS tube, the collector of the second MOS tube is grounded, the emitter of the first MOS tube is also connected with a connecting wire between the grid of the first MOS tube and the grid of the second MOS tube, the emitter of the second MOS tube is connected with the collector of the third MOS tube, the grid of the third MOS tube is used for receiving the first PWM signal, and the emitter of the third MOS tube is used for outputting the second PWM signal.
7. An LED display device comprising an LED driving circuit according to any one of claims 1 to 6.
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