CN118098145A - Energy saving method, energy saving circuit, driving chip, display panel and LED display device - Google Patents
Energy saving method, energy saving circuit, driving chip, display panel and LED display device Download PDFInfo
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- CN118098145A CN118098145A CN202410520197.5A CN202410520197A CN118098145A CN 118098145 A CN118098145 A CN 118098145A CN 202410520197 A CN202410520197 A CN 202410520197A CN 118098145 A CN118098145 A CN 118098145A
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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
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- 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
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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Abstract
The invention discloses an energy-saving method, an energy-saving circuit, a driving chip, a display panel and an LED display device, which comprises the steps of scattering the period of each frame into a plurality of subframes and sequencing the subframes, scattering the plurality of pixel data of each frame according to a scattering threshold value and a scattering algorithm, and distributing the scattered plurality of pixel data into each subframe according to the sequence numbers of the subframes; and comparing the serial numbers of the subframes with a maximum display subframe threshold, and controlling the LED display device to enter a black screen energy-saving mode in the subframes when the serial numbers of the subframes are larger than the maximum display subframe threshold, so that the black screen energy-saving mode is easy to trigger, the energy-saving efficiency is improved, and the power consumption of the LED display device is further reduced.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to an energy-saving method, an energy-saving circuit, a driving chip, a display panel and an LED display device.
Background
With the progress of LED display technology, LED display devices are being developed toward high resolution, high image quality, and low power consumption, which is a relatively important development direction of LED display devices. The LED driving chip is used as an important electronic component in the LED display device, the power consumption ratio of the LED driving chip in the LED display device is also relatively large, and the power consumption of the whole LED display device can be well reduced by reducing the power consumption of the LED driving chip.
In the prior art, a black screen energy-saving technology is adopted to reduce the power consumption of an LED driving chip, and the principle is to judge whether the image of each frame is a completely black image or not, namely, judge whether a plurality of pixel data of each frame are all 0, if the plurality of pixel data are all 0, the LED driving chip at the moment can not drive a lamp bead on an LED display screen to display, and can turn off a part of circuits of the LED driving chip to enter a black screen state. The traditional black screen energy saving technology takes a frame as a unit, and only when the pixel data of the whole frame is all 0, the black screen energy saving function is triggered, so that the energy saving triggering condition is more severe, and the energy saving efficiency is lower.
Therefore, a new energy saving method, an energy saving circuit, a driving chip, a display panel, and an LED display device have been proposed to solve the above problems.
Disclosure of Invention
In view of the foregoing, an object of the present invention is to provide an energy saving method, an energy saving circuit, a driving chip, a display panel, and an LED display device, which can improve energy saving efficiency and further reduce power consumption of the driving chip.
According to a first aspect of the present invention, there is provided an energy saving method applied to an LED display device, the energy saving method comprising scattering a period of each frame into a plurality of subframes and ordering the subframes, and scattering a plurality of pixel data of each frame according to a scattering threshold and a scattering algorithm, and distributing the scattered plurality of pixel data into each subframe according to a sequence number of the plurality of subframes; comparing the sequence number of each subframe with a maximum display subframe threshold value, and controlling the LED display device to enter a black screen energy-saving mode in the subframe when the sequence number of the subframe is larger than the maximum display subframe threshold value.
Optionally, the energy saving method further includes receiving and latching original image data of a next frame when a frame synchronization signal of each frame arrives, obtaining maximum pixel data in the original image data, and calculating to obtain a maximum display subframe threshold of the next frame according to the maximum pixel data.
Optionally, the calculating the maximum display subframe threshold of the next frame according to the maximum pixel data includes determining the number of subframes allocated to the maximum pixel data according to the break-up threshold and a break-up algorithm, and taking the number of subframes as the maximum display subframe threshold of the next frame.
Optionally, the distributing the scattered pixel data to each subframe according to the sequence number of the subframes includes distributing the scattered pixel data to each subframe in a dichotomy ordering manner.
According to a second aspect of the present invention, there is provided a power saving circuit applied to an LED display device, the power saving circuit including a scattering module for scattering and ordering a period of each frame into a plurality of subframes, and scattering a plurality of pixel data of each frame according to a scattering threshold and a scattering algorithm, and distributing the scattered plurality of pixel data into each subframe according to a sequence number of the plurality of subframes; and the energy-saving signal generation module is used for comparing the serial numbers of the subframes with a maximum display subframe threshold value, and controlling the LED display device to enter a black screen energy-saving mode in the subframes when the serial numbers of the subframes are larger than the maximum display subframe threshold value.
Optionally, the energy-saving circuit further includes a data receiving and latching module for receiving and latching the original image data of the next frame when the frame synchronization signal of each frame arrives; and the calculating module is used for calculating the maximum display subframe threshold value of the next frame according to the maximum pixel data in the original image data.
Optionally, the calculation module is configured to determine the number of subframes to which the maximum pixel data is allocated according to the break-up threshold and the break-up algorithm, and take the number of subframes as a maximum display subframe threshold of a next frame.
Optionally, the scattering module is configured to distribute the scattered pixel data into each subframe in a manner of binary ordering.
According to a third aspect of the present invention, there is provided a driving chip comprising a row driving circuit connected to a plurality of row lines for providing a selection signal; a column driving circuit connected to the plurality of column lines for providing driving signals corresponding to the pixel data; and an energy saving circuit as described above.
Optionally, the column driving circuit includes a constant current output unit configured to be turned off after the LED display device enters a black screen energy saving mode.
According to a fourth aspect of the present invention, there is provided a display panel comprising a plurality of pixel cells, each of the plurality of pixel cells comprising an LED connected to one of the plurality of row lines and one of the plurality of column lines; and a driver chip as described above.
According to a fifth aspect of the present invention, there is provided an LED display device comprising the display panel described above.
According to the energy-saving method, the energy-saving circuit, the driving chip, the display panel and the LED display device, the minimum unit of energy saving of the black screen is shortened to one subframe from one frame, so that even if a plurality of pixel data of one frame are not all 0 in low gray scale, as long as the pixel data of part of subframes in the frame are all 0, the subframes can enter the black screen energy-saving mode, the black screen energy-saving mode is easy to trigger, the energy-saving efficiency is improved, and the power consumption of the LED display device is further reduced.
In a preferred embodiment, the calculating module calculates the maximum display sub-frame threshold of each frame in the time of the previous frame of the frame, so that the power saving signal generating circuit can respond quickly when the frame synchronizing signal of each frame arrives.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic structure of an LED display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing a driver chip employing the SPWM algorithm to divide the period of each frame according to an embodiment of the present invention;
FIG. 3 shows a schematic diagram of a power saving circuit according to an embodiment of the invention;
fig. 4 shows a flow diagram of a power saving method according to an embodiment of the invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. The same elements or modules are denoted by the same or similar reference numerals in the various figures. For clarity, the various features of the drawings are not drawn to scale.
It should be appreciated that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and/or elements capable of storing instructions for execution by the programmable circuits. When an element or circuit is referred to as being "connected to" another element or circuit is "connected between" two nodes, it can be directly coupled or connected to the other element or intervening elements may be present, the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, it means that there are no intervening elements present between the two.
Also, certain terms are used throughout the description and claims to refer to particular components. It will be appreciated by those of ordinary skill in the art that a hardware manufacturer may refer to the same component by different names. The present patent specification and claims do not take the form of an element or components as a functional element or components as a rule.
Furthermore, it should be noted that relational terms such as first and second 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.
Fig. 1 shows a schematic structure of an LED display device according to an embodiment of the present invention.
Referring to fig. 1, the led display device includes a power saving circuit 100, a driving chip composed of a row driving circuit 200, a column driving circuit 300, and a plurality of pixel units arranged in an array.
Wherein, the row driving circuit 200 is connected with a plurality of row lines for providing selection signals; the column driving circuit 300 is connected to a plurality of column lines for providing driving signals corresponding to pixel data; each pixel cell includes an LED connected to one of a plurality of row lines and one of a plurality of column lines.
Further, the column driving circuit 300 includes a constant current output unit 310.
Further, the power saving circuit 100 may be integrated into the driving chip.
Further, the LED display device further includes a display panel, and the driving chip and the plurality of pixel units may be disposed in the display panel.
In the embodiment of the invention, the driving chip adopts SPWM (scrambled-PWM) display algorithm to control the display of the LED display device.
Fig. 2 shows a schematic diagram of a driver chip dividing the period of each frame using the SPWM algorithm according to an embodiment of the present invention.
Referring to fig. 2, the spwm display algorithm equally divides the period of each frame into a plurality of subframes.
Fig. 3 shows a schematic diagram of a power saving circuit according to an embodiment of the invention.
Referring to fig. 3, an energy saving circuit 100 according to an embodiment of the present invention is applied to an LED display device. The power saving circuit 100 includes a break-up module (not shown), a data receiving and latching module 110, a calculating module 120, and a power saving signal generating module 130.
The scattering module is used for scattering the period of each frame into a plurality of subframes and sequencing the subframes, scattering the plurality of pixel data of each frame according to a scattering threshold value and a scattering algorithm, and distributing the scattered plurality of pixel data into each subframe according to the sequence numbers of the plurality of subframes. The scattered pixel data are preferentially allocated to subframes with smaller sequence numbers, for example, a certain pixel data is scattered into three sub-pixel data of 4, 4 and 2, and then the three sub-pixel data are sequentially allocated to three subframes with sequence numbers of 1-3.
Further, the number of the plurality of subframes is determined by the number of the break-up groups, and assuming that the number of the break-up groups is 6, the period (time) of each frame is evenly broken up into 6 subframes.
Further, the scattering module is configured to distribute the scattered plurality of pixel data into each subframe in a dichotomy ordering manner.
It will be appreciated that when distributing the scattered pixel data to each sub-frame, the binary sorting is only a preferred embodiment, and in the actual use process, the modes of selecting sorting, bubbling sorting and the like can be adopted.
In addition, the invention does not limit the number of the break-up groups, the break-up algorithm and the break-up threshold, and in practical application, the number of the break-up groups, the break-up algorithm and the break-up threshold can be set according to the needs. Different scattering results can be obtained by adopting different scattering algorithms. The purpose of the break-up threshold is to prevent the analog channels of the LED driver chip from turning on and off too much due to the display time of a single sub-frame being too short. Assuming that the break-up threshold is 4 and the number of break-up groups is 6, taking the threshold break-up algorithm as an example, when any pixel data is broken up, each subframe is allocated to 4 and then the next subframe is allocated according to the sequence of subframes, so that the cycle is performed. Assuming that one of the pixel data in the nth frame is 17, the pixel data is scattered into the first five subframes of the nth frame, and the pixel data allocated to the first five subframes are respectively 4, and 1, the plurality of subpixel data of the last subframe of the nth frame are all 0, that is, the display gray scale of the last subframe is all 0. Of course, an average break-up algorithm may be used, i.e. each pixel data is broken up equally into several sub-pixel data.
The energy-saving signal generating module 130 is configured to compare the sequence number of each subframe with a maximum display subframe threshold, and when the sequence number of the subframe is greater than the maximum display subframe threshold, control the LED display device to enter a black screen energy-saving mode in the subframe. The power saving signal generating module 130 may latch the maximum display subframe threshold of each frame after the arrival of the frame synchronization signal of the frame.
Specifically, the energy-saving signal generating module 130 generates an energy-saving signal according to the comparison result of the serial number of each subframe and the maximum display subframe threshold value, and the LED display device selects whether to enter the black screen energy-saving mode in each subframe according to the energy-saving signal.
Further, when the subframe number is less than or equal to the maximum display subframe threshold, the subframe energy-saving signal generating module 130 outputs an energy-saving signal of a first level, which indicates that the display gray scale of the subframe is not 0, and at this time, the energy-saving signal controls the LED display device not to enter the black screen energy-saving mode and display normally. When the subframe number is greater than the maximum display subframe threshold, the subframe energy-saving signal generating module 130 outputs an energy-saving signal of a second level, which indicates that the display gray scale of the subframe is 0, at this time, the energy-saving signal controls the LED display device to enter a black screen energy-saving mode, and after entering the black screen energy-saving mode, a part of circuits of the driving chip, for example, the constant current output unit 310 is turned off.
Alternatively, the first level is, for example, a low level, and the second level is, for example, a high level.
The data receiving and latching module 110 is configured to receive and latch original image data of a next frame to be displayed after a frame synchronization signal of each frame arrives.
Wherein the original image data of the next frame and the frame synchronization signal of each frame are inputted from the outside of the driving chip. The original image data of each frame includes a plurality of pixel data corresponding to a plurality of pixel units one to one.
The calculation module 120 is connected to the data receiving and latching module 110 and the power saving signal generating module 130.
The calculating module 120 is configured to compare a plurality of pixel data in the original image data of the next frame in a time of each frame to obtain a maximum pixel data in the plurality of pixel data, and calculate a maximum display subframe threshold of the next frame according to the maximum pixel data.
Further, the calculation module 120 is configured to determine the number of subframes to which the maximum pixel data is allocated according to the break-up threshold and the break-up algorithm, and take this as the maximum display subframe threshold. Taking the break-up threshold of 4 as an example, the maximum pixel data of the next frame is 17, which is evenly distributed to the first five subframes of the next frame, and thus the maximum display subframe threshold of the next frame is 5.
Fig. 4 shows a flow diagram of a power saving method according to an embodiment of the invention.
Referring to fig. 4, the present invention also provides an energy saving method applied to an LED display device, the energy saving method comprising:
step S1: the method comprises the steps of scattering the period of each frame into a plurality of subframes, sequencing the subframes, scattering the plurality of pixel data of each frame according to a scattering threshold value and a scattering algorithm, and distributing the scattered plurality of pixel data into each subframe according to the sequence numbers of the subframes;
in step S1, the scattered pixel data are preferentially allocated to the sub-frames with smaller sequence numbers.
Further, allocating the scattered plurality of pixel data into each sub-frame according to the sequence numbers of the plurality of sub-frames includes: the scattered pixel data are distributed into the subframes in a dichotomy ordering mode.
Step S2: comparing the serial numbers of the subframes with a maximum display subframe threshold, and controlling the LED display device to enter a black screen energy-saving mode in the subframes when the serial numbers of the subframes are larger than the maximum display subframe threshold.
In addition, the energy saving method provided by the invention further comprises the following steps:
And when the frame synchronizing signal of each frame arrives, receiving and latching the original image data of the next frame, and calculating the maximum display subframe threshold value of the next frame according to the maximum pixel data in the original image data in each frame time.
The calculating to obtain the maximum display subframe threshold value of the next frame according to the maximum pixel data in the original image data comprises the following steps:
The number of subframes to which the maximum pixel data is allocated is determined according to the break-up threshold and the break-up algorithm, and is taken as the maximum display subframe threshold.
In order to better understand the energy saving circuit and the energy saving method provided by the embodiment of the invention, the LED display device is provided with 8 pixel units, the break-up threshold is 4, the break-up group number is 6, the maximum display subframe threshold of the nth frame is 3, the pixel data in the original image data of the (n+1) th frame is 0, 6, 17, 12, 13, 5, 8 and 1 in sequence, and the break-up algorithm adopts the threshold break-up algorithm as an example to exemplarily illustrate the energy saving circuit and the energy saving method provided by the embodiment of the invention.
Specifically, after the nth frame synchronization signal arrives, the energy-saving signal generating circuit 130 compares the serial number of the 6 subframes of the nth frame with the maximum display subframe threshold 3, and outputs the energy-saving signal of the first level in the subframes with serial numbers of 1-3 to control the LED display device not to enter the black screen energy-saving mode, and outputs the energy-saving signal of the second level in the subframes with serial numbers of 4-6 to control the LED display device to enter the black screen energy-saving mode.
Upon arrival of the nth frame synchronizing signal, the data receiving and latching module 110 receives and latches the original image data (0, 6, 17, 12, 13, 5, 8, 1) of the (n+1) th frame. The calculation module 120 calculates the maximum display sub-frame threshold 5 of the n+1th frame according to the maximum pixel data 17 in the original image data of the n+1th frame in the nth frame time.
According to the energy-saving method, the energy-saving circuit, the driving chip, the display panel and the LED display device, the minimum unit of energy saving of the black screen is shortened to one subframe from one frame, so that even if a plurality of pixel data of one frame are not all 0 in low gray scale, as long as the display gray scale of some subframes in the frame is all 0, the subframes can enter the black screen energy-saving mode, the black screen energy-saving mode is easy to trigger, the energy-saving efficiency is improved, and the power consumption of the driving chip is further reduced. In addition, the calculating module 120 calculates the maximum display sub-frame threshold of each frame in the previous frame time of the frame, so that the power saving signal generating circuit 130 can respond quickly when the frame synchronization signal of each frame arrives.
Embodiments in accordance with the present invention, as described above, are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. The scope of the invention should be determined by the appended claims and their equivalents.
Claims (12)
1. An energy saving method applied to an LED display device, the energy saving method comprising:
The method comprises the steps of scattering the period of each frame into a plurality of subframes, sequencing the subframes, scattering the plurality of pixel data of each frame according to a scattering threshold value and a scattering algorithm, and distributing the scattered plurality of pixel data into each subframe according to the sequence numbers of the subframes;
comparing the sequence number of each subframe with a maximum display subframe threshold value, and controlling the LED display device to enter a black screen energy-saving mode in the subframe when the sequence number of the subframe is larger than the maximum display subframe threshold value.
2. The energy saving method of claim 1, further comprising:
When the frame synchronizing signal of each frame arrives, the original image data of the next frame is received and latched, the maximum pixel data in the original image data is obtained, and the maximum display subframe threshold of the next frame is calculated according to the maximum pixel data.
3. The power saving method of claim 2, wherein the calculating a maximum display subframe threshold for a next frame from the maximum pixel data comprises:
and determining the number of subframes allocated to the maximum pixel data according to the scattering threshold and the scattering algorithm, and taking the number of subframes as the maximum display subframe threshold of the next frame.
4. The power saving method of claim 1, wherein the distributing the scattered plurality of pixel data into the respective subframes according to the sequence numbers of the plurality of subframes comprises:
The scattered pixel data are distributed into the subframes in a dichotomy ordering mode.
5. An energy saving circuit for use in an LED display device, the energy saving circuit comprising:
The scattering module is used for scattering the period of each frame into a plurality of subframes and sequencing the subframes, scattering the plurality of pixel data of each frame according to a scattering threshold value and a scattering algorithm, and distributing the scattered plurality of pixel data into each subframe according to the sequence numbers of the plurality of subframes; and
And the energy-saving signal generation module is used for comparing the sequence number of each subframe with a maximum display subframe threshold value, and controlling the LED display device to enter a black screen energy-saving mode in the subframe when the sequence number of the subframe is larger than the maximum display subframe threshold value.
6. The power saving circuit of claim 5, further comprising:
The data receiving and latching module is used for receiving and latching the original image data of the next frame when the frame synchronizing signal of each frame arrives; and
And the calculating module is used for calculating the maximum display subframe threshold value of the next frame according to the maximum pixel data in the original image data.
7. The power saving circuit of claim 6, wherein the computing module is configured to determine the number of subframes to which the maximum pixel data is allocated as a maximum display subframe threshold for a next frame according to the break-up threshold and a break-up algorithm.
8. The power saving circuit of claim 5, wherein the scattering module is configured to distribute the scattered plurality of pixel data into individual subframes in a dichotomy ordering.
9. A driver chip, comprising:
A row driving circuit connected with the row lines for providing selection signals;
A column driving circuit connected to the plurality of column lines for providing driving signals corresponding to the pixel data; and
The energy saving circuit of any one of claims 5-8.
10. The driver chip of claim 9, wherein the column driver circuit comprises a constant current output unit configured to turn off after the LED display device enters a black screen power saving mode.
11. A display panel, comprising:
a plurality of pixel cells, each of the plurality of pixel cells including an LED connected to one of the plurality of row lines and one of the plurality of column lines; and
The driver chip of any of claims 9-10.
12. An LED display device, comprising:
The display panel of claim 11.
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| CN118098145B (en) | 2024-08-13 |
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