CN112967663B - LED driving method and driving device - Google Patents
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- G—PHYSICS
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
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Abstract
The invention relates to an LED driving method and an LED driving device. The LED driving method comprises the following steps: acquiring a preset refresh rate of a display module, an adjustment parameter for adjusting the preset opening times of a row and display gray scale, wherein the preset refresh rate comprises the preset total opening times of a column; reducing the preset opening times of the line according to the adjusting parameters to obtain the target opening times of the line; and driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale. By implementing the method, in some implementation processes, under the condition of keeping the refresh rate unchanged, the number of times of starting the row is reduced, and the number of times of charging and discharging parasitic capacitors of the row is reduced, so that the power consumption of the LED control circuit is reduced under the condition of keeping the refresh rate unchanged.
Description
Technical Field
The invention relates to the field of LED display, in particular to an LED driving method and a driving device.
Background
With the development of small spacing, the LED display screen puts higher requirements on line driving, from the realization of line switching by a simple P-type field effect transistor (P-MOSFET) to the multi-functional line driving with higher integration and stronger functions. In the related art, a Pulse-Width Modulation (PWM) is used to output a current signal, and different current signal Pulse widths represent different gray levels displayed by an LED, wherein a high gray level requires a wider current signal Pulse Width, and a low gray level corresponds to a narrower current signal Pulse Width. In the related art, a break-up function is used to improve the refresh rate of the LED display.
However, in the related art, in order to increase the refresh rate, the LED light emitting device is switched many times in one frame, that is, the MOS switch for controlling the column signal is turned on many times in one frame, and the row signal is also turned on the same number of times as the column signal, so that the parasitic capacitance on the row line is charged and discharged many times due to the parasitic capacitance on the row line, thereby increasing the power consumption of the LED control circuit.
Therefore, how to solve the above technical problems is a problem that needs to be solved at present.
Disclosure of Invention
In view of the above-mentioned shortcomings of the related art, the present application aims to provide a method and a device for driving an LED, and aims to reduce power consumption of an LED control circuit while ensuring that a refresh rate is not changed.
An LED driving method, comprising:
acquiring a preset refresh rate of a display module, an adjustment parameter for adjusting the preset opening times of a row and display gray scale, wherein the preset refresh rate comprises the preset total opening times of a column;
reducing the preset opening times of the line according to the adjusting parameters to obtain the target opening times of the line;
and driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale.
According to the LED driving method, the target starting times of the line are obtained by reducing the preset starting times of the line; and driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale, and reducing the charging and discharging times of the parasitic capacitors of the rows by reducing the opening times of the rows under the condition of keeping the refresh rate unchanged in some implementation processes, thereby reducing the power consumption of the LED control circuit under the condition of ensuring that the refresh rate is unchanged.
Optionally, the driving the display module according to the target turn-on number of the row, the preset refresh rate, and the display gray scale includes:
determining the starting duration of the row when the column is started each time according to the target starting times of the row and the display gray scale, wherein the starting duration of the row is longer than the duration of the column when the row is started;
and driving the display module according to the target opening times of the rows, the opening duration of the rows each time, the preset refresh rate and the display gray scale.
Optionally, the reducing the preset number of times of opening the row according to the adjustment parameter to obtain the target number of times of opening the row includes:
determining whether the display gray scale is larger than a preset gray scale threshold value;
if so, acquiring a first threshold corresponding to the adjustment parameter;
and reducing the preset opening times of the row based on the first threshold value to obtain the target opening times of the row, wherein the target opening times of the row is equal to 1.
Optionally, after determining whether the display gray scale is greater than a preset gray scale threshold, the method further includes:
if the display gray scale is smaller than the preset gray scale threshold, acquiring a second threshold corresponding to the adjustment parameter, wherein the second threshold is smaller than the first threshold;
and reducing the preset starting times of the row based on the second threshold value to obtain the target starting times of the row, wherein the target starting times of the row are more than 1 and less than the preset starting times of the row.
Optionally, the adjustment parameter is pre-configured in the display module.
Based on the same inventive concept, the present application also provides an LED driving apparatus, comprising:
the display device comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring a preset refresh rate of the display module, an adjustment parameter for adjusting the preset opening times of a row and display gray scale, and the preset refresh rate comprises the preset total opening times of a column;
the calculation module is used for reducing the preset opening times of the row according to the adjustment parameters to obtain the target opening times of the row;
and the driving module is used for driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale.
The LED driving device is provided with the acquisition module and is used for acquiring the preset refresh rate of the display module, the adjustment parameter for adjusting the preset opening times of the row and the display gray scale, wherein the preset refresh rate comprises the preset total opening times of the row; the calculation module is used for reducing the preset opening times of the row according to the adjustment parameters to obtain the target opening times of the row; the driving module is used for driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale; in some implementation processes, the number of times of charging and discharging parasitic capacitors of the rows is reduced by reducing the number of times of opening the rows under the condition that the refresh rate is kept unchanged, so that the power consumption of the LED control circuit is reduced under the condition that the refresh rate is kept unchanged.
Optionally, the calculating module is further configured to determine, according to the target opening times of the rows and the display gray scale, an opening duration of the row when the column is opened each time, where the opening duration of the row is greater than a duration of the column when the row is opened;
the driving module is specifically configured to drive the display module according to the target number of times of opening the row, the opening duration of the row at each time, the preset refresh rate, and the display gray scale.
Optionally, the method further includes: a determination module, wherein,
the judging module is used for determining whether the display gray scale is larger than a preset gray scale threshold value;
the obtaining module is further configured to obtain a first threshold corresponding to the adjustment parameter when the display gray scale is greater than a preset gray scale threshold;
the calculation module is specifically configured to reduce the preset number of times of opening of the row based on the first threshold to obtain a target number of times of opening of the row, where the target number of times of opening of the row is equal to 1.
Optionally, the obtaining module is further configured to obtain a second threshold corresponding to the adjustment parameter when the display gray scale is smaller than a preset gray scale threshold, where the second threshold is smaller than the first threshold;
the calculation module is specifically configured to reduce the preset number of times of opening of the row based on the second threshold to obtain a target number of times of opening of the row, where the target number of times of opening of the row is greater than 1 and less than the preset number of times of opening of the row.
Optionally, the adjustment parameter is pre-configured in the display module.
Drawings
Fig. 1 is a flowchart of an LED driving method according to an embodiment of the present invention;
FIG. 2 is a timing diagram of a current signal according to a related art according to an embodiment of the present invention;
FIG. 3 is a timing diagram of a current signal according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an LED driving apparatus according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram of a display unit according to a second embodiment of the present invention.
Description of reference numerals:
40-LED driving device; 41-an acquisition unit; 42-a calculation unit; 43-a drive unit; 51-row data lines; 52-column data line.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the related art, the power consumption of the LED control circuit is increased while the refresh rate of the LED display screen is increased.
Based on this, the present application intends to provide a solution to the above technical problem, the details of which will be explained in the following embodiments.
The first embodiment is as follows:
referring to fig. 2, fig. 2 is a timing diagram of a current signal in a related art according to an embodiment of the present invention. In the related art, each time the LED is refreshed, the row line is turned on, and the parasitic capacitance on the row line is charged and discharged. In order to improve the visual refresh rate of the LED display screen, the row signal is usually turned on multiple times within T1, n times within one frame when T1 is one frame, and each turn-on includes m clock cycles GCLK by dividing the row signal into n times within one frame, so that the total light emitting duration of the LED light emitting device is m × n clock cycles GCLK. However, as the row line is opened n times, the parasitic capacitance on the row line is also charged and discharged n times, and the power consumption of the LED driving circuit is increased. Specifically, for example, in the related art, to increase the refresh rate, the LED lamp is turned on and off many times in a frame, for example, 14bit for displaying the highest gray 16384, the principle is that the LED lamp is turned on for a plurality of times within one frame through the scattering function, if the scattering function is not available, the LED lamp is turned on and off for 1 time within one frame, the refresh rate is 60Hz, if the break-up function is added, it will be turned on and off 32 times in a frame (for example only, the specific value is not limited), the refresh rate will be 32 times that of the original, i.e., 1920Hz, although the frame rate is increased, the row is similarly switched 32 times, the MOS controlled will be switched 32 times within a frame, the switch is switched 1920 times in one second, because the parasitic capacitance exists on the row line, the parasitic capacitance must be charged and discharged 1920 times, so that the power consumption is increased, in order to reduce this part of power consumption, the embodiment of the invention provides a new LED driving method.
Referring to fig. 1, fig. 1 is a flowchart of an LED driving method according to an embodiment of the present invention, where the LED driving method includes:
s101, acquiring a preset refresh rate of a display module, an adjustment parameter for adjusting the preset opening times of a row and display gray scale, wherein the preset refresh rate comprises the preset total opening times of a column.
It should be understood that the display gray scale is the gray scale at which the image of the next frame is to be displayed, that is, the number of clock periods GCLK of the next frame.
Wherein the adjusting parameters are pre-configured in the display module; it should be understood that the modification or refreshing of the tuning parameters may be performed according to actual needs.
And S102, reducing the preset opening times of the line according to the adjusting parameters to obtain the target opening times of the line.
Specifically, the reducing the preset number of times of opening the row according to the adjustment parameter to obtain the target number of times of opening the row includes: determining whether the display gray scale is larger than a preset gray scale threshold value; if so, acquiring a first threshold corresponding to the adjustment parameter; and reducing the preset opening times of the row based on the first threshold value to obtain the target opening times of the row, wherein the target opening times of the row is equal to 1. For example, the grayscale threshold may be 16384, and when the display grayscale is greater than the grayscale threshold, the first threshold corresponding to the adjustment parameter is obtained, and the preset number of times of opening the row is subtracted by the first threshold to obtain a target number of times of opening the row, so that the final row is opened only once in one frame.
Specifically, after determining whether the display gray scale is greater than a preset gray scale threshold, the method further includes: if the display gray scale is smaller than the preset gray scale threshold, acquiring a second threshold corresponding to the adjustment parameter, wherein the second threshold is smaller than the first threshold; and reducing the preset opening times of the row based on the second threshold to obtain the target opening times of the row, wherein the target opening times of the row are more than 1 and less than the preset opening times of the row. For example, the threshold grayscale threshold may be 16384, and when the display grayscale is smaller than 16384, a second threshold corresponding to the adjustment parameter is obtained, and the target number of times of opening of the line is obtained by subtracting the second threshold from the preset number of times of opening of the line, so that the number of times of opening of the line in one frame is greater than 1 and smaller than the preset number of times of opening of the line.
And S103, driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale.
Wherein driving the display module according to the target number of times of turning on the row, the preset refresh rate, and the display gray scale comprises: determining the starting duration of the row when the column is started each time according to the target starting times of the row and the display gray scale, wherein the starting duration of the row is longer than the duration of the column when the row is started; by controlling the starting time of the row to be longer than the time of the column when the row is started, the refresh rate of the display unit is not influenced while the row starting times are reduced. Referring to fig. 3, fig. 3 is a timing diagram of a current signal according to an embodiment of the present invention, wherein when T1 is a frame duration, an adjustment parameter is subtracted from a preset turn-on number of the row, so that a target turn-on number of the row in a frame is equal to 1; and controlling the opening time length of the row in one frame to be larger than the time length of the column when the row is opened under the condition of not changing the refresh rate. And driving the display module according to the target opening times of the rows, the opening duration of the rows each time, the preset refresh rate and the display gray scale. In one frame, the row is opened once, the column is opened n times, and the number of the clock cycles GCLK of opening the column once is m; thus, each time a row is opened, the number of clock cycles GCLK on a column is m × n.
In the LED driving method provided in this embodiment, a preset refresh rate of a display module, an adjustment parameter for adjusting a preset turn-on number of a row, and a display gray level are obtained, where the preset refresh rate includes a preset total turn-on number of a column; reducing the preset opening times of the line according to the adjusting parameters to obtain the target opening times of the line; driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale; obtaining the target opening times of the line by reducing the preset opening times of the line; and driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale, and reducing the charging and discharging times of the parasitic capacitors of the rows by reducing the opening times of the rows under the condition of keeping the refresh rate unchanged in some implementation processes, thereby reducing the power consumption of the LED control circuit under the condition of ensuring that the refresh rate is unchanged.
Example two
Based on the same inventive concept, the present application further provides an LED driving apparatus 40, as shown in fig. 4, fig. 4 is an LED driving apparatus provided in the second embodiment of the present invention, the apparatus includes:
an obtaining module 41, configured to obtain a preset refresh rate of a display module, an adjustment parameter for adjusting a preset number of opening times of a row, and a display gray scale, where the preset refresh rate includes a preset total number of opening times of a column;
a calculating module 42, configured to reduce the preset number of times of opening of the row according to the adjustment parameter, to obtain a target number of times of opening of the row;
and a driving module 43, configured to drive the display module according to the target turn-on number of the row, the preset refresh rate, and the display gray scale.
It should be understood that the display gray scale is the gray scale at which the image of the next frame is to be displayed, that is, the number of clock periods GCLK of the next frame.
Wherein the adjusting parameters are pre-configured in the display module; it should be understood that the modification or refreshing of the tuning parameters may be performed according to actual needs.
The LED driving device further includes: the judging module is used for determining whether the display gray scale is larger than a preset gray scale threshold value; the obtaining module is further configured to obtain a first threshold corresponding to the adjustment parameter when the display gray scale is greater than a preset gray scale threshold; the calculation module is specifically configured to reduce the preset number of times of opening of the row based on the first threshold to obtain a target number of times of opening of the row, where the target number of times of opening of the row is equal to 1. For example, the grayscale threshold may be 16384, and when the display grayscale is greater than the grayscale threshold, the first threshold corresponding to the adjustment parameter is obtained, and the preset number of times of opening the row is subtracted by the first threshold to obtain a target number of times of opening the row, so that the final row is opened only once in one frame.
The obtaining module is further configured to obtain a second threshold corresponding to the adjustment parameter when the display gray scale is smaller than a preset gray scale threshold, where the second threshold is smaller than the first threshold; the calculation module is specifically configured to reduce the preset number of times of opening of the row based on the second threshold to obtain a target number of times of opening of the row, where the target number of times of opening of the row is greater than 1 and smaller than the preset number of times of opening of the row. For example, the threshold grayscale threshold may be 16384, and when the display grayscale is smaller than 16384, a second threshold corresponding to the adjustment parameter is obtained, and the target number of times of opening of the line is obtained by subtracting the second threshold from the preset number of times of opening of the line, so that the number of times of opening of the line in one frame is greater than 1 and smaller than the preset number of times of opening of the line.
The calculation module is further configured to determine, according to the target opening times of the rows and the display gray scale, an opening duration of the row at each opening of the column, where the opening duration of the row is longer than a duration of the column at the opening of the row; by controlling the starting time of the row to be longer than the time of the column when the row is started, the refresh rate of the display unit is not influenced while the row starting times are reduced. The driving module is specifically configured to drive the display module according to the target number of times of opening the row, the opening duration of the row at each time, the preset refresh rate, and the display gray scale.
The present embodiment further provides a display unit, referring to fig. 5, including an LED array, a plurality of row data lines 51, a plurality of column data lines 52, and the LED driving device 40 as described above;
each row of data lines 51 electrically connects first poles of the same row of LED light emitting devices in the LED array;
each column data line 52 electrically connects second poles of the same column of LED light emitting devices in the LED array;
the LED driving device 50 is used for providing a current signal to drive the diode array;
either one of the row data line 51 and the column data line 52 is electrically connected to a current signal output terminal of the LED driving device 50 to receive a current signal, and the other one receives a scan signal.
In this embodiment, the first electrode of the LED light emitting device is an anode, and the second electrode is a cathode. For an LED light emitting device, the row data line and the column data line are connected to the anode and the cathode, respectively, in other embodiments, the anode may be connected to the column data line, and the cathode may be connected to the row data line. According to different circuit connection modes, the current signal output by the LED driving device can be positive or negative. When the display unit is displaying, the scanning signals are used to scan the row data lines or the column data lines one by one, and the scanning signals are used to scan the row data lines, which is generally called as row scanning display. In this embodiment, the scan signal may also be provided by the LED driving device.
The LED driving device is provided with the acquisition module and is used for acquiring the preset refresh rate of the display module, the adjustment parameter for adjusting the preset opening times of the row and the display gray scale, wherein the preset refresh rate comprises the preset total opening times of the row; the calculation module is used for reducing the preset opening times of the row according to the adjustment parameters to obtain the target opening times of the row; the driving module is used for driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale; in some implementation processes, the number of times of charging and discharging parasitic capacitors of the rows is reduced by reducing the number of times of opening the rows under the condition that the refresh rate is kept unchanged, so that the power consumption of the LED control circuit is reduced under the condition that the refresh rate is kept unchanged.
The present embodiments also provide a readable storage medium that includes volatile or non-volatile, removable or non-removable media implemented in any method or technology for storage of information such as readable instructions, data structures, program modules or other data. Readable storage media include, but are not limited to, RAM (Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash Memory or other Memory technology, CD-ROM (Compact Disc Read-Only Memory), Digital Versatile Discs (DVD) or other optical Disc storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a processor.
The readable storage medium in this embodiment stores one or more programs, and the one or more programs are executable by one or more processors to implement the steps of the LED driving method as described above.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (6)
1. An LED driving method, comprising:
acquiring a preset refresh rate of a display module, an adjustment parameter for adjusting the preset opening times of a row and display gray scale, wherein the preset refresh rate comprises the preset total opening times of a column;
determining whether the display gray scale is larger than a preset gray scale threshold value;
if yes, the target opening times of the obtained row is equal to 1;
after the determining whether the display gray scale is greater than a preset gray scale threshold, the method further comprises:
if the display gray scale is smaller than the preset gray scale threshold, acquiring a second threshold corresponding to the adjustment parameter;
reducing the preset starting times of the row based on the second threshold to obtain the target starting times of the row, wherein the target starting times of the row are more than 1 and less than the preset starting times of the row;
and driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale.
2. The LED driving method of claim 1, wherein said driving the display module according to the target number of on times of the row, the preset refresh rate, and the display gray scale comprises:
determining the starting time length of the row when the column is started each time according to the target starting times of the row and the display gray scale, wherein the starting time length of the row is longer than the time length of the column when the row is started;
and driving the display module according to the target opening times of the rows, the opening duration of the rows each time, the preset refresh rate and the display gray scale.
3. The LED driving method according to claim 1, wherein the adjustment parameter is pre-configured in the display module.
4. An LED driving apparatus, comprising:
the display device comprises an acquisition module, a display module and a control module, wherein the acquisition module is used for acquiring a preset refresh rate of the display module, an adjustment parameter for adjusting the preset opening times of a row and display gray scale, and the preset refresh rate comprises the preset total opening times of a column;
the judging module is used for determining whether the display gray scale is larger than a preset gray scale threshold value;
the calculation module is specifically used for obtaining that the target opening times of the row is equal to 1 when the display gray scale is larger than a preset gray scale threshold;
the obtaining module is further configured to obtain a second threshold corresponding to the adjustment parameter when the display gray scale is smaller than a preset gray scale threshold;
the calculation module is further configured to reduce the preset starting times of the row based on the second threshold to obtain target starting times of the row, where the target starting times of the row are greater than 1 and smaller than the preset starting times of the row;
and the driving module is used for driving the display module according to the target opening times of the rows, the preset refresh rate and the display gray scale.
5. The LED driving apparatus according to claim 4, wherein the calculation module is further configured to determine an on duration of the row at each time of the column being on according to the target number of times of the row and the display gray scale, the on duration of the row being longer than a duration of the column when the row is on;
the driving module is specifically configured to drive the display module according to the target number of times of opening the row, the opening duration of the row at each time, the preset refresh rate, and the display gray scale.
6. The LED driving apparatus according to claim 4, wherein the adjustment parameter is pre-configured in the display module.
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