CN110610688A - Method and device for adapting dynamic bandwidth of display layer - Google Patents
Method and device for adapting dynamic bandwidth of display layer Download PDFInfo
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- CN110610688A CN110610688A CN201910919077.1A CN201910919077A CN110610688A CN 110610688 A CN110610688 A CN 110610688A CN 201910919077 A CN201910919077 A CN 201910919077A CN 110610688 A CN110610688 A CN 110610688A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1407—General aspects irrespective of display type, e.g. determination of decimal point position, display with fixed or driving decimal point, suppression of non-significant zeros
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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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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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
Abstract
The invention provides a method and a device for adapting dynamic bandwidth of a display layer, wherein the method comprises the following steps: counting layer information of next frame of image data, and determining corresponding maximum line data according to the layer information; calculating the maximum row bandwidth of the next frame of image data according to the maximum row data volume and the row refreshing time, and determining the memory frequency corresponding to the maximum row bandwidth according to the corresponding relation between the data bandwidth and the memory frequency; judging whether the current memory frequency is less than the memory frequency corresponding to the maximum row bandwidth, if so, executing step S1: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth. By the scheme, the self-adaption of bandwidth prediction and memory frequency conversion required by the display layer can be realized, and the power consumption is reduced.
Description
Technical Field
The present invention relates to the field of memory frequency conversion, and in particular, to a method and an apparatus for adapting a dynamic bandwidth of a display layer.
Background
The memory frequency is usually set according to the actual bandwidth requirement, that is, the memory frequency conversion is performed, in order to optimize the system power consumption. However, the display principle of the LCD display is to refresh the memory at regular time, and the resolution of the LCD is relatively high, so the requirement on the bandwidth of the memory is relatively high, and therefore, if the data is terminated due to the frequency conversion of the memory during the refresh process, the LCD will display an abnormal state.
In the memory frequency conversion period, each controller is not allowed to access the memory port to access data, and when the memory data needs to be acquired, the frequency conversion is carried out when each port enters idle. And the display module needs to interact with the user, and if the real data is not refreshed timely, the user can intuitively feel the phenomenon of blocking, so that the sensory experience of the user is influenced. Each display screen has a specific blanking period, and the blanking period does not influence the display of the picture, so that the common memory frequency conversion needs to be completed in the blanking period. Whether the memory frequency meets the requirement of the layer data of the next frame or not needs to be known in advance in the blanking period after the last frame is finished.
Therefore, how to enable the memory frequency adjusted in the blanking period to meet the display requirement of the next frame of image data is a problem to be solved urgently in the current memory frequency conversion field.
Disclosure of Invention
Therefore, a technical scheme for adapting the dynamic bandwidth of the display layer is needed to be provided, so as to solve the problem that the memory frequency adjusted in the blanking period cannot meet the display requirement of the next frame of image data.
To achieve the above object, the inventor provides a method for dynamic bandwidth adaptation of a display layer, the method comprising the steps of:
counting layer information of next frame of image data, and determining corresponding maximum line data according to the layer information;
calculating the maximum row bandwidth of the next frame of image data according to the maximum row data volume and the row refreshing time, and determining the memory frequency corresponding to the maximum row bandwidth according to the corresponding relation between the data bandwidth and the memory frequency;
judging whether the current memory frequency is less than the memory frequency corresponding to the maximum row bandwidth, if so, executing step S1: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth.
Further, the method comprises the steps of:
when it is determined that the current memory frequency is not less than the memory frequency corresponding to the maximum line bandwidth, step S2 is executed: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth.
Further, the method comprises the steps of:
the step S1 or S2 is performed in the blanking period after the display of the current frame image data is completed.
Further, "determining the corresponding maximum data amount according to the layer information" includes:
counting the number of layers corresponding to each line in the next frame of image data;
counting the data quantity corresponding to each line according to the number of layers corresponding to each line and the data quantity of each layer in the same line;
and determining the data volume of the row with the maximum data volume as the maximum row data volume.
Further, "calculating the maximum line bandwidth of the next frame of image data according to the maximum line data amount and the line refresh time" includes:
and calculating the ratio of the maximum row data size to the row refreshing time, and determining the ratio as the maximum row bandwidth of the next frame of image data.
Further, the "correspondence between data bandwidth and memory frequency" is obtained by:
selecting the lowest memory operation frequency required by each data bandwidth under the condition of meeting the preset condition, determining the lowest memory operation frequency as the memory frequency corresponding to each data bandwidth, and recording the memory frequency into a table;
the preset conditions are that the current display screen does not have screen flashing and the video data transmission does not have abnormal interruption.
Further, the "determining the corresponding maximum data amount according to the layer information" includes:
and when the number of layers of the next frame of image data is judged to be only 1 layer, counting the data volume of any line of the next frame of image data and determining the data volume as the maximum line data volume.
The inventor further provides a device for dynamic bandwidth adaptation of a display layer, where the device includes a display controller and a processor, where the display controller is connected to the processor, and the display controller and the processor adjust a memory frequency according to the method described above.
The method and the device for adapting the dynamic bandwidth of the display layer in the technical scheme comprise the following steps: counting layer information of next frame of image data, and determining corresponding maximum line data according to the layer information; calculating the maximum row bandwidth of the next frame of image data according to the maximum row data volume and the row refreshing time, and determining the memory frequency corresponding to the maximum row bandwidth according to the corresponding relation between the data bandwidth and the memory frequency; judging whether the current memory frequency is less than the memory frequency corresponding to the maximum row bandwidth, if so, executing step S1: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth. By the scheme, the self-adaption of bandwidth prediction and memory frequency conversion required by the display layer can be realized, and the power consumption is reduced.
Drawings
Fig. 1 is a flowchart of a method for dynamic bandwidth adaptation of a display layer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a dynamic bandwidth adaptation apparatus for a display layer according to another embodiment of the present invention;
description of reference numerals:
101. a memory;
102. a display controller;
103. a processor.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
Fig. 1 is a flowchart illustrating a method for dynamic bandwidth adaptation of a display layer according to an embodiment of the present invention. The method comprises the following steps:
firstly, step S101 is carried out to count the layer information of the next frame of image data, and the corresponding maximum line data amount is determined according to the layer information.
Then step S102 is carried out, the maximum row bandwidth of the next frame of image data is calculated according to the maximum row data volume and the row refreshing time, and the memory frequency corresponding to the maximum row bandwidth is determined according to the corresponding relation between the data bandwidth and the memory frequency;
then, step S103 is performed to determine whether the current memory frequency is less than the memory frequency corresponding to the maximum line bandwidth, if so, step S1 is performed: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth.
Through the steps, the maximum bandwidth required by the next frame image display can be predicted in advance before the next frame image is output and displayed, and then the DDR frequency is adjusted to the DDR frequency corresponding to the maximum bandwidth in advance, so that on one hand, the next frame image can be prevented from being jammed during display, and on the other hand, the system power consumption is reduced.
In certain embodiments, the method comprises the steps of: when it is determined that the current memory frequency is not less than the memory frequency corresponding to the maximum line bandwidth, step S2 is executed: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth. In short, if the current memory frequency does not satisfy the maximum line bandwidth requirement of the next frame image display, the current memory frequency is adjusted to the frequency corresponding to the maximum line bandwidth requirement of the next frame image display, so that the next frame image does not have a pause phenomenon during transmission and display. Otherwise, if the current memory frequency is greater than the maximum line bandwidth requirement of the next frame of image display, the current memory frequency is down-regulated to the DDR frequency corresponding to the maximum line bandwidth, so as to reduce the power consumption of the system.
In certain embodiments, the method comprises the steps of: the step S1 or S2 is performed in the blanking period after the display of the current frame image data is completed. The processor performs frequency conversion on the memory in a blanking period of the display screen, where the blanking period refers to a time required for the display screen to start displaying another picture or region, and the frequency conversion changes a frequency of the memory, such as reducing a frequency of the memory, so as to achieve a purpose of reducing a bandwidth and reducing power consumption, or such as increasing a frequency of the memory, so as to achieve a purpose of improving a storage efficiency of the memory. The frequency conversion is carried out in the blanking period of the display screen, and the display does not update the display picture at the moment, so that the influence on the display picture when the internal memory is subjected to frequency conversion is reduced as much as possible. Preferably, the blanking period time can be prolonged by reducing the display frame rate of the current frame picture, so as to ensure that the blanking period time is greater than the time required by the memory frequency conversion, so that the memory can complete the frequency conversion within the time period of the blanking period.
In some embodiments, determining the maximum row data amount according to the layer information includes: counting the number of layers corresponding to each line in the next frame of image data; counting the data quantity corresponding to each line according to the number of layers corresponding to each line and the data quantity of each layer in the same line; and determining the data volume of the row with the maximum data volume as the maximum row data volume. In short, when determining the maximum row data amount, the number of each row layer is considered on one hand, and the data amount corresponding to each layer is considered on the other hand. For example, if layer information in next frame of image information has three layers, when determining the maximum line data amount, the maximum line data amount may be determined according to the overlapping area of the 3 layers and the data amount of each layer in the overlapping area, for example, if a certain line of image data a is two layers overlapped and includes an a layer and a B layer, the data amount of the a layer in the line is 10, and the data amount of the B layer in the line is 8, the line data amount of the line a is configured to be 18; and another line of image data B is formed by overlapping three layers and comprises an A layer, a B layer and a C layer, wherein the data volume of the A layer in the line is 10, the data volume of the B layer in the line is 2, and the data volume of the C layer in the line is 3, so that the line data volume of the line B is configured to be 15. Although the number of layers of the row b is larger than that of the row a, the total amount of image data included in the row a is larger than that of the row b, and thus the data amount of the row a is preferentially determined as the maximum row data amount when determining the maximum row data amount.
In some embodiments, calculating the maximum line bandwidth of the next frame of image data based on the maximum line data amount and the line refresh time comprises: and calculating the ratio of the maximum row data size to the row refreshing time, and determining the ratio as the maximum row bandwidth of the next frame of image data. Generally, the refresh time of the image data is configured to be a relatively fixed value, and thus the larger the amount of line data transmitted, the larger the bandwidth requirement for the next frame of image. After the maximum line data amount is determined, the maximum line bandwidth of the image data of the next frame can be determined by calculating the ratio of the maximum line data amount to the line refreshing time. The method meets the maximum line bandwidth requirement of next frame image transmission, and also meets the bandwidth requirement of next frame image when other line data are transmitted.
In some embodiments, the "correspondence between data bandwidth and memory frequency" is obtained by: selecting the lowest memory operation frequency required by each data bandwidth under the condition of meeting the preset condition, determining the lowest memory operation frequency as the memory frequency corresponding to each data bandwidth, and recording the memory frequency into a table; the preset conditions are that the current display screen does not have screen flashing and the video data transmission does not have abnormal interruption. The phenomenon of screen flashing can be obtained through manual observation of technicians and also can be obtained through analyzing the pixel value of each display pixel on the current display screen. The abnormal interruption can be judged by a video output module of the display controller, and when data cannot be transmitted to a display screen for display (on the premise that the bandwidth is met, the current DDR frequency is complemented), the abnormal interruption occurs.
In some embodiments, the determining the maximum line data amount according to the layer information includes: and when the number of layers of the next frame of image data is judged to be only 1 layer, counting the data volume of any line of the next frame of image data and determining the data volume as the maximum line data volume. In short, if the image layer of the next frame of image data has only 1 layer, which indicates that the data amount of each row is consistent, in order to improve the statistical efficiency, the data amount of any row is selected and determined as the maximum row data amount.
As shown in fig. 2, the inventor further provides an apparatus for dynamic bandwidth adaptation of a display layer, where the apparatus includes a display controller 102 and a processor 103, the display controller 102 is connected to the processor 103, and the display controller 102 and the processor 103 adjust a frequency of a memory 101 according to the method described above.
Preferably, the processor may be a device having a processing function, such as a CPU, an MCU, or the like; the display screen can be various display screens such as LCD, LED, CRT and the like; the memory can be SDRAM, DDR SDRAM, RDRAM, etc.
The invention provides a method and a device for adapting dynamic bandwidth of a display layer, wherein the method comprises the following steps: counting layer information of next frame of image data, and determining corresponding maximum line data according to the layer information; calculating the maximum row bandwidth of the next frame of image data according to the maximum row data volume and the row refreshing time, and determining the memory frequency corresponding to the maximum row bandwidth according to the corresponding relation between the data bandwidth and the memory frequency; judging whether the current memory frequency is less than the memory frequency corresponding to the maximum row bandwidth, if so, executing step S1: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth. By the scheme, the self-adaption of bandwidth prediction and memory frequency conversion required by the display layer can be realized, and the power consumption is reduced.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (8)
1. A method for dynamic bandwidth adaptation of display layers, the method comprising the steps of:
counting layer information of next frame of image data, and determining corresponding maximum line data according to the layer information;
calculating the maximum row bandwidth of the next frame of image data according to the maximum row data volume and the row refreshing time, and determining the memory frequency corresponding to the maximum row bandwidth according to the corresponding relation between the data bandwidth and the memory frequency;
judging whether the current memory frequency is less than the memory frequency corresponding to the maximum row bandwidth, if so, executing step S1: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth.
2. Method for dynamic bandwidth adaptation of display layers according to claim 1, characterized in that the method comprises the steps of:
when it is determined that the current memory frequency is not less than the memory frequency corresponding to the maximum line bandwidth, step S2 is executed: and adjusting the current memory frequency to the memory frequency corresponding to the maximum row bandwidth.
3. Method for dynamic bandwidth adaptation of display layers according to claim 1 or 2, characterized in that the method comprises the steps of:
the step S1 or S2 is performed in the blanking period after the display of the current frame image data is completed.
4. The method according to claim 1, wherein determining the corresponding maximum line data amount according to the layer information comprises:
counting the number of layers corresponding to each line in the next frame of image data;
counting the data quantity corresponding to each line according to the number of layers corresponding to each line and the data quantity of each layer in the same line;
and determining the data volume of the row with the maximum data volume as the maximum row data volume.
5. The method for dynamic bandwidth adaptation of display layers according to claim 1, wherein calculating the maximum row bandwidth for the next frame of image data based on the maximum row data amount and the row refresh time comprises:
and calculating the ratio of the maximum row data size to the row refreshing time, and determining the ratio as the maximum row bandwidth of the next frame of image data.
6. The method for dynamic bandwidth adaptation of display layers according to claim 1, wherein the "correspondence between data bandwidth and memory frequency" is obtained by:
selecting the lowest memory operation frequency required by each data bandwidth under the condition of meeting the preset condition, determining the lowest memory operation frequency as the memory frequency corresponding to each data bandwidth, and recording the memory frequency into a table;
the preset conditions are that the current display screen does not have screen flashing and the video data transmission does not have abnormal interruption.
7. The method according to claim 1, wherein the "determining a maximum amount of corresponding line data according to the layer information" comprises:
and when the number of layers of the next frame of image data is judged to be only 1 layer, counting the data volume of any line of the next frame of image data and determining the data volume as the maximum line data volume.
8. An apparatus for dynamic bandwidth adaptation of display layers, the apparatus comprising a display controller and a processor, the display controller being connected to the processor, the display controller and the processor adjusting a memory frequency according to the method of any one of claims 1 to 7.
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