WO2024050678A1

WO2024050678A1 - Low-power-consumption processing apparatus and method for providing image data to display, and device

Info

Publication number: WO2024050678A1
Application number: PCT/CN2022/117140
Authority: WO
Inventors: 卓永红
Original assignee: 卓永红
Priority date: 2022-09-06
Filing date: 2022-09-06
Publication date: 2024-03-14
Also published as: CN115668099A

Abstract

Disclosed in the present invention are a low-power-consumption processing apparatus and method for providing image data to a display, and a device. The method comprises: if there is no change in a picture to be displayed or said picture is a still image, and compressed data has been prepared, starting decompression to provide image data of said picture to a display; and if there is a change in said picture or said picture is a dynamic image, generating image data of said picture in real time and providing the image data to the display, or starting compression again to generate compressed data of said picture. The low-power-consumption processing apparatus in the present invention can compress and store image data of a still image in advance, and when the still image is displayed, instead of a GPU executing a graphics rendering program, a decoder decompresses the compressed data and provides the decompressed data to a display for imaging, thereby reducing the power consumption required by the device to display the still image.

Description

Low-power processing device, method and apparatus for providing image data to display

Technical field

The present invention relates to the technical field of computer graphics processing, and in particular to a low-power processing device, method and equipment for providing image data to a display.

Background technique

Every time the monitors of various image display devices (such as mobile phones, personal computers, tablets, smart bracelets, smart glasses, etc.) refresh the screen, the GPU (graphics processor) needs to obtain a frame buffer (FrameBuffer). The source data of the frame image is processed to generate image data, which is then copied to the line buffer. The display controller reads the image data from the line buffer, and is finally imaged by the display. For an LCD display device with a resolution of 800×480, a 24-bit color depth, and a refresh frame rate of 60Hz, the amount of data that the GPU needs to copy from the frame buffer per second is 800×480×3×60=65MB. When displaying still images, the GPU also needs to process the same amount of data, resulting in a lot of wasted power.

On the other hand, due to the small chip area of DRAM (Dynamic Random Access Memory) and the large storage capacity, the frame buffer is set in DRAM. However, DRAM requires continuous periodic refresh current to maintain data from being lost, and it also consumes a lot of power. Consumption.

technical problem

The technical problem to be solved by the present invention is to provide a low-power processing device, method and equipment for providing image data to a display, so that the display requires less power consumption and storage space to display images.

Technical solutions

According to an embodiment, a low-power processing device that provides image data to a display includes a CPU, a GPU, a memory, an encoder and a decoder; if it is determined that the picture to be displayed has no change or that the picture to be displayed is a still image, then it is determined that the picture to be displayed is a still image. Whether the compressed data of the picture to be displayed is prepared. If so, the decoder decompresses the compressed data of the picture to be displayed into image data according to the compression scheme to provide the image data to the display; if not, the GPU generates the image data to be displayed. The image data of the display screen is provided to the display, and the encoder generates the compressed data of the screen to be displayed according to the compression scheme; when it is determined that the screen to be displayed changes or the screen to be displayed is a dynamic image, the GPU generates The image data of the picture to be displayed is used to provide the image data to the display, or the GPU generates the image data of the picture to be displayed, so as to provide the image data to the display. The encoder generates the picture to be displayed according to the compression scheme. The compressed data of the picture to be displayed; wherein, the GPU generates the image data of the picture to be displayed in real time based on reading the source data of the picture to be displayed; the encoder generates the compressed data of the picture to be displayed based on reading the picture to be displayed. The image data of the screen to be displayed is generated in real time.

According to another embodiment, a low-power processing method for providing image data to a display includes: determining that the picture to be displayed has no change or that the picture to be displayed is a still image, and then determining whether the compressed data of the picture to be displayed is prepared. If so, , then start decompression to provide the image data of the picture to be displayed to the display; if not, generate the image data of the picture to be displayed to provide to the display, and start compression to generate the image data of the picture to be displayed according to the compression scheme Compressed data; the decompression is to decompress the compressed data of the picture to be displayed into image data according to the compression scheme; it is determined that the picture to be displayed has changed or the picture to be displayed is a dynamic image, then the image data of the picture to be displayed is generated, so as to Provide the image data to the display, or generate the image data of the picture to be displayed, to provide the image data to the display, and start compression, and generate the compressed data of the picture to be displayed according to the compression scheme; wherein, generating the picture to be displayed The image data of the display screen is generated in real time based on reading the source data of the screen to be displayed; the compressed data for generating the screen to be displayed is generated in real time based on reading the image data of the screen to be displayed.

According to another embodiment, an image display device includes the above-mentioned low-power processing device, and a display connected to the above-mentioned low-power processing device.

beneficial effects

The low-power processing device of the present invention can compress and store the image data of the still image in advance. When displaying the still image, the GPU does not need to execute the graphics rendering program. It only needs the decoder to decompress the compressed data and provide it to the display for display imaging. , which can reduce the power consumption of the device when displaying still images.

Description of the drawings

Figure 1 is a structural block diagram of a low-power processing device of an image display device according to some embodiments.

FIG. 2 is a flow chart of a low-power processing method for providing image data to a display according to one embodiment.

FIG. 3 is a flowchart of a low-power processing method for providing image data to a display according to another embodiment.

Best Mode of Carrying Out the Invention

The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments recorded here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

As shown in the example of FIG. 1, the image display device includes a low-power processing device and a display. Image display devices may include personal computers, computer workstations, mobile phones, portable game devices, music video players, portable smart wearable devices (e.g., smart bracelets, smart watches, smart glasses), portable smart translation devices, automotive electronic dashboards Display devices, automotive electronic control system display devices, or other types of devices that process and display graphic data.

The image display device can display still images and dynamic images. A still image refers to when the device refreshes the display screen, within a sustained period of time (for example, 3-5 seconds) or after a certain number of continuous refreshes (for example, 5-10 times). There is no change in the display screen. Dynamic images mean that when the device refreshes the display screen, the display screen changes from the previous frame within a sustained period of time (for example, 3-5 seconds) or after a certain number of continuous refreshes (for example, 5-10 times). If the refresh frame rate of the monitor is 60Hz, it will refresh 60 times in one second. If the refresh continues for 5 seconds, that is, it refreshes 300 times, and the display screen does not change, then the display screen is a still image. Within 5 seconds of displaying this still image, the GPU needs to read data from the frame buffer 300 times and execute the graphics rendering program 300 times, which wastes a lot of power and also takes up a lot of memory bandwidth.

In order to reduce power consumption, the low-power processing device of this embodiment can, when displaying dynamic images, the GPU executes a graphics rendering program to generate image data in real time. At the same time, the encoder can also start working under the control of the GPU to convert the image data. Compressedly encoded and stored for use by the decoder. When the dynamic image is still, since the image data has been pre-compressed and stored, the GPU does not need to execute the graphics rendering program. It only needs the decoder to decompress the compressed data and provide it to the monitor for display imaging. Because when displaying still images, the GPU does not execute the graphics rendering program, only the decoder works, and the decoder has a small amount of calculations and requires low power consumption, thus reducing a lot of power consumption.

On the other hand, after repeatedly refreshing and displaying the same picture 2 or 3 times, the GPU then controls the encoder to start working and provides the image data of the picture to the encoder, so that when the still picture is refreshed and displayed again later, it only needs to be decoded The processor works and the GPU does not need to work. When displaying dynamic images, only the GPU needs to work, and the encoder and decoder do not need to work, which can further reduce power consumption.

In addition, since the RLE image compression algorithm is relatively simple and has low computational complexity, the RLE algorithm can be used as the compression solution. The encoder may include an RLE encoder, and the decoder may include an RLE decoder. In this way, compression and encoding can be performed while displaying dynamic images without consuming more power.

Displays may include liquid crystal displays (LCD displays), plasma display panels, light emitting diode (LED) array displays, cathode ray tube (CRT) displays, nanocrystal displays, electronic paper, and projection equipment. The display can be integrated into the image display device or can be an independent device connected to the image display device through a cable or wireless communication interface.

As shown in the example of Figure 1, the low-power processing device includes a CPU, GPU, memory, line buffer, display controller, encoder, decoder, pixel buffer and data interface. Components communicate with each other via buses and communication interfaces. It should be noted that the specific configurations of buses and communication interfaces between different components of the low-power processing device in the figure are only exemplary, and other configurations and/or other graphics processing systems with the same or different components may also be used. technology for implementing the present disclosure.

The CPU can be a general-purpose or special-purpose processor that controls an image display device and can execute a variety of software programs, such as computer operating system programs, embedded operating system programs, and various application software programs (e.g., browsers, emails, media players , GUI application (Graphical User Interface, graphical user interface)). The CPU can use human-computer interaction input devices (such as keyboards, buttons, touch screens, microphones), or various sensors (such as vehicle speed sensors, fuel sensors, wiper sensors), or communication modules (such as Bluetooth communication modules, WIFI communication module, GPRS communication module), or other input devices coupled to the image display device via a data interface to obtain the source data of the picture to be displayed. Various software programs running on the CPU can call the graphics API (Application Program Interface), execute the GPU driver, issue graphics rendering commands to the GPU, and start the GPU to generate image data for the display to form images.

The source data of the screen to be displayed may include messages from system programs and various application software programs received through the communication network, text data and multimedia streaming data, and messages and data generated by various application software programs (for example, generated by voice translation APPs). translated text, game data generated by electronic game APP), car status data sent by various car sensors (for example, current speed, current remaining fuel level, current remaining power, current car light status), various health status sensors sent health status data (e.g., heart rate, body temperature), real-time location data sent by the positioning navigator.

By judging that the source data of the picture to be displayed is the same as the source data of the previous frame, the CPU determines that the picture to be displayed has no change or that the picture to be displayed is a static image; by judging that the source data of the picture to be displayed is the same as the source data of the previous frame. If they are not the same, it is determined that the picture to be displayed has changed or the picture to be displayed is a dynamic image. Various software programs running in the CPU can use built-in program data and operation steps to define application logic that determines whether the source data of the picture to be displayed is the same as the source data of the previous frame.

In one embodiment, after the CPU determines that the source data of the picture to be displayed is different from the source data of the previous frame, the CPU sets the source data update flag to a valid state; the CPU determines that the source data of the picture to be displayed is different from the source data of the previous frame. After the data is the same, the source data update flag is set to an invalid state. The source data update flag is used to indicate whether there is any change in the picture to be displayed or whether the picture to be displayed is a static or dynamic image.

In one embodiment, after acquiring the source data of the picture to be displayed, the CPU compares the source data of the picture to be displayed with the source data of the previous frame. If the two are not the same, the CPU writes the source data of the picture to be displayed into memory, and set the source data update flag to a valid state. If the two are the same, the source data of the screen to be displayed will not be written to the memory, and the source data update flag will be set to an invalid state.

In one embodiment, when starting to refresh the frame to be displayed, the CPU determines whether it has received updated source data of the frame to be displayed. If so, it writes the source data of the frame to be displayed into the memory and sets the source data update flag to Valid status, if not, set the source data update flag to invalid status. The updated source data of the picture to be displayed includes source data received closest to the time when the picture to be displayed is refreshed and is different from the source data of the previous frame of picture.

In one embodiment, the software program running in the CPU can write the source data update flag into the GPU driver, and the GPU can check whether the source data update flag is in a valid state through the GPU driver. The GPU driver can receive instructions from the CPU via the graphics API and control the GPU to execute these instructions, which can be stored in memory.

The memory can also store program data and instructions executable by the CPU, as well as graphics data associated with the application program, as well as source data of the screen to be displayed obtained through the data interface and/or bus, and data generated by other components. Such as the compressed data generated by the encoder.

In one embodiment, the memory is SRAM (Static Random Access Memory), which does not require continuous periodic refresh current to maintain data without loss, which can further reduce power consumption.

The GPU can receive the frame start signal sent by the display controller or other external display control module. After completing the initialization work, it reads the source data of the screen to be displayed and executes the graphics rendering program. If there is no change in the picture to be displayed or the picture to be displayed is a still image and the compressed data is prepared, the GPU does not read the source data of the picture to be displayed; if the compressed data is not prepared, the GPU reads the source data from the memory and generates image data in real time. , providing image data to the display and encoder. If the picture to be displayed changes or the picture to be displayed is a dynamic image, the GPU reads the source data from the memory and generates image data in real time to provide image data to the display, or to provide image data to the display and encoder.

In one embodiment, after the GPU receives the frame start signal, it first checks whether the source data update flag is in a valid state. If so, it means that the picture to be displayed has changed or the picture to be displayed is a dynamic image, and the GPU reads the source data from the memory. , and generate image data in real time.

In one embodiment, the GPU checks whether the source data update flag is in a valid state through the GPU driver. If not, the GPU then checks whether the compressed frame flag is valid. If so, the GPU sends a start signal to the decoder to start the decoder. The GPU can read the compressed data from the memory and send it to the decoder; or after the decoder starts working, it can read the compressed data directly from the memory.

In one embodiment, the GPU detects through the GPU driver that the source data of the same frame has been continuously processed two or three times, and the compressed frame flag is valid, and then sends a start signal to the decoder to control the decoder to start working.

In one embodiment, if the GPU detects through the GPU driver that the source data of the same frame has been continuously processed two or three times and the compressed frame flag is invalid, the GPU can send a start signal to the encoder to control the encoder to start working.

In one embodiment, the GPU checks whether the source data update flag is in a valid state through the GPU driver, and if so, sends a start signal to the encoder to control the encoder to start working.

In one embodiment, the GPU checks whether the source data update flag is in a valid state through the GPU driver. If not, it checks whether the compressed frame flag is in a valid state. If not, it sends a start signal to the encoder to control the encoder to start working. .

In one embodiment, the GPU writes the generated image data to a pixel buffer to provide the image data to the encoder. The pixel buffer is used to store image data generated by the GPU and provide this image data to the encoder.

In one embodiment, the GPU writes the generated image data to the line buffer to provide the image data to the display. The line cache is used to store image data generated by the GPU and decompressed by the decoder, and provide the image data to the display.

The display controller can be a display interface connected to the display, can read image data from the line buffer, and output it to the display for the display to form an image, and can send a frame start signal to the GPU (for example, field synchronization signal VSYNC, field elimination Hidden signal VBLANK).

In one embodiment, the display controller can be replaced by an external display control module, which sends a frame start signal to the GPU, reads image data from the line buffer, and outputs it to the display for the display to form an image.

The encoder can execute various encoding algorithms, read the image data generated by the GPU in the pixel buffer, compress it, generate the compressed data and write it to the memory.

In one embodiment, the encoder starts working after receiving the start signal sent by the GPU.

In one embodiment, the encoder sets the compressed frame flag to a valid state after completing the compressed data of a frame of picture, and sets the compressed frame flag to an invalid state at the beginning of compression encoding. The compressed frame flag is used to indicate whether or not compressed data is prepared.

In one embodiment, the GPU checks whether the source data update flag is in a valid state. If not, it then checks whether the compressed frame flag is in a valid state. If not, it sends a start signal to the encoder and reads the source data from the memory in real time. Image data is generated and written to the line buffer and pixel buffer to provide image data to the display and encoder.

In one embodiment, the GPU detects through the GPU driver that the source data of the same frame has been continuously processed two or three times, and the compressed frame flag is in an invalid state, and a start signal can be sent to the encoder to control the encoder to start working.

In one embodiment, the GPU checks whether the source data update flag is in a valid state through the GPU driver. If so, it sends a start signal to the encoder, reads the source data from the memory, generates image data in real time, and writes it to the line cache. and pixel buffers to provide image data to displays and encoders.

The decoder executes a decoding algorithm that matches the encoder, decompresses the compressed data, and then writes the decompressed image data to the line buffer to provide image data to the display. The decoder only starts decompression when the picture to be displayed does not change or the picture to be displayed is a still image.

In one embodiment, the GPU checks whether the source data update flag is in a valid state. If not, it then checks whether the compressed frame flag is in a valid state. If so, it sends a start signal to the decoder, and the decoder starts working after receiving the start signal.

In one embodiment, the GPU detects through the GPU driver that the source data of the same frame has been continuously processed two or three times, and the compressed frame flag is in a valid state, and then sends a start signal to the decoder to control the decoder to start working.

In one embodiment, after the decoder starts working, the compressed data can be read directly from the memory. In another embodiment, after the decoder starts working, it receives the compressed data sent by the GPU after reading it from the memory.

The pixel cache stores image data generated by the GPU in real time and provides that image data to the encoder. The pixel cache can be a FIFO (First Input First Output, first in first out) data cache.

In one embodiment, the pixel buffer can only store image data for less than one row of pixels.

The line buffer can receive the image data generated by the GPU in real time and the image data decompressed by the decoder in real time, and provide it to the display controller or external display control module to enable the display to generate images. The row cache can be a FIFO data cache.

In one embodiment, the row buffer can only store image data of one row of pixels.

In one embodiment, the line buffer can store image data of multiple lines of pixels to meet the real-time timing processing of high-resolution displays.

As shown in the example of Figure 2, the low-power processing method of providing image data to a display in this embodiment includes blocks 10-11.

In block 10, it is determined that the picture to be displayed has no change or the picture to be displayed is a still image, and then it is determined whether the compressed data of the picture to be displayed is prepared. If so, decompression is started to provide the image data of the picture to be displayed to the display. ; If not, the image data of the picture to be displayed is generated to provide it to the display, and compression is started, and the compressed data of the picture to be displayed is generated according to the compression scheme. The decompression is to decompress the compressed data of the picture to be displayed into image data according to the compression scheme.

The image data for generating the picture to be displayed is generated in real time based on reading the source data of the picture to be displayed.

In one embodiment, the GPU can check through the GPU driver that the source data of the same frame has been continuously processed two or three times, and the compressed frame valid flag is in an invalid state, and then the encoder is controlled to start working.

In one embodiment, the GPU can check through the GPU driver that the source data of the same frame has been continuously processed two or three times, and the compressed frame valid flag is in a valid state, which can control the decoder to start working.

The compressed frame flag is used to indicate whether or not the compressed data is prepared. After the compressed data of a frame is completed, the compressed frame flag is set to a valid state. At the beginning of compression encoding, the compressed frame flag is set to an invalid state.

In block 11, if it is determined that the picture to be displayed changes or the picture to be displayed is a dynamic image, the image data of the picture to be displayed is generated to provide the image data to the display, or the image data of the picture to be displayed is generated to provide the display with the image data. The image data is provided, compression is started, and compressed data of the picture to be displayed is generated according to the compression scheme.

Wherein, generating the compressed data of the picture to be displayed is generated in real time based on reading the image data of the picture to be displayed.

In one embodiment, if the picture to be displayed changes or the picture to be displayed is a dynamic image, the GPU generates image data in real time and writes it into the line buffer to provide the image data to the display.

In one embodiment, if the picture to be displayed changes or the picture to be displayed is a dynamic image, the GPU generates image data in real time and writes it into the line buffer and pixel buffer to provide the image data to the display and encoder.

The above blocks 10-11 can be executed in different orders and combinations according to the actual situation.

As shown in the example of Figure 3, the low-power processing method of providing image data to a display in this embodiment includes blocks 20-27. In block 20, by determining that the source data of the picture to be displayed is the same as the source data of the previous frame, it is determined that the picture to be displayed has no change or that the picture to be displayed is a static image.

In one embodiment, the CPU can determine that the source data of the image to be displayed is the same as the source data of the previous frame, thereby determining that there is no change in the image to be displayed or that the image to be displayed is a static image.

In block 21, the source data update flag is set to an invalid state to indicate that there is no change in the picture to be displayed or that the picture to be displayed is a static image.

In one embodiment, the source data update flag may be set to an invalid state by the CPU.

In block 22, by determining that the source data of the picture to be displayed is different from the source data of the previous frame, it is determined that the picture to be displayed has changed or that the picture to be displayed is a dynamic image.

In one embodiment, the CPU can determine that the picture to be displayed has changed or that the picture to be displayed is a dynamic image by determining that the source data of the picture to be displayed is different from the source data of the previous frame.

In block 23, the source data update flag is set to a valid state to indicate that the picture to be displayed has changed or that the picture to be displayed is a dynamic image.

In one embodiment, the source data update flag may be set to a valid state through the CPU.

In one embodiment, after acquiring the source data of the picture to be displayed, the CPU can compare whether the source data of the picture to be displayed is the same as the source data of the previous frame. If not, write the source data of the picture to be displayed into memory, and set the source data update flag to a valid state. If so, the source data of the screen to be displayed is not written to the memory, and the source data update flag is set to an invalid state.

In one embodiment, when starting to refresh the frame to be displayed, the CPU can determine whether the updated source data of the frame to be displayed is received. If so, the source data of the frame to be displayed is written into the memory and the source data update is set. Mark as valid, if not, set the source data update mark as invalid. The updated source data of the picture to be displayed includes source data received closest to the time when the picture to be displayed is refreshed and is different from the source data of the previous frame of picture.

In one embodiment, the source data update flag may be written into the GPU driver through a software program running in the CPU.

In one embodiment, the GPU can be used to check whether the source data update flag is in a valid state through the GPU driver.

In block 24, it is determined whether the compressed data of the picture to be displayed is prepared by checking whether the compressed frame flag is in a valid state.

In one embodiment, after completing the compressed data of one frame of picture, the compressed frame flag is set to a valid state, and at the beginning of compression encoding, the compressed frame flag is set to an inactive state.

In one embodiment, the state of the compressed frame flag may be set by the encoder.

In one embodiment, the GPU can be used to determine whether the compressed data of the picture to be displayed is prepared by checking whether the compressed frame flag is in a valid state.

In block 25, if it is checked that the source data update flag is in a valid state, image data of the screen to be displayed is generated to provide the image data to the display.

In one embodiment, after receiving the frame start signal through the GPU, it first checks whether the source data update flag is in a valid state. If so, it means that the picture to be displayed has changed or the picture to be displayed is a dynamic image, and the GPU reads the source data from the memory. data, generating image data in real time.

In one embodiment, the generated image data may be written to a pixel buffer by the GPU to provide the image data to the encoder.

In one embodiment, the generated image data may be written to the line buffer by the GPU to provide the image data to the display.

In block 26, if it is checked that the source data update flag is in an invalid state and the compressed frame flag is in a valid state, decompression is started to provide the display with image data of the picture to be displayed.

Among them, decompression is to decompress the compressed data of the picture to be displayed into image data according to the compression scheme.

In one embodiment, the GPU can be used to check whether the source data update flag is in a valid state. If not, then check whether the compressed frame flag is in a valid state. If so, a start signal is sent to the decoder, and the decoder starts after receiving the start signal. Work.

In one embodiment, the compression scheme includes the RLE algorithm.

In block 27, if it is checked that the source data update flag is in an invalid state and the compressed frame flag is in an invalid state, compression is started, and the compressed data of the picture to be displayed is generated according to the compression scheme.

In one embodiment, the GPU can be used to check whether the source data update flag is in a valid state. If not, then check whether the compressed frame flag is in a valid state. If so, a start signal is sent to the encoder, and the encoder starts after receiving the start signal. Work to generate the compressed data of the picture to be displayed according to the compression scheme.

In block 28, the compressed data is written to memory.

In one embodiment, after the encoder generates compressed data, it is written into the memory through the bus.

The above blocks 20-28 can be executed in different orders and combinations according to the actual situation.

The preferred embodiments are cited above to further describe the purpose, technical solutions and advantages of the present invention in detail. It should be understood that the above embodiments are only disclosed to enable those skilled in the art to make or implement them, and It is not intended to limit the scope of the present invention. Any obvious modifications, equivalent substitutions and improvements made on the basis of the principles defined in the present invention shall be included in the protection scope of the present invention. The scope of the rights claimed by the present invention should not be limited to the above-mentioned embodiments, but should be the broadest possible scope consistent with the principles and technical features defined in the claims of the present invention.

Claims

A low-power processing device that provides image data to a display, characterized in that it includes a CPU, a GPU, a memory, an encoder and a decoder;

After determining that the picture to be displayed has no change or that the picture to be displayed is a still image, it is then determined whether the compressed data of the picture to be displayed is prepared. If so, the decoder decompresses the compressed data of the picture to be displayed according to the compression scheme into Image data to provide the image data to the display; if not, the GPU generates image data of the picture to be displayed to provide the image data to the display, and the encoder generates image data according to the compression scheme Generate compressed data of the picture to be displayed;

If it is determined that the picture to be displayed changes or the picture to be displayed is a dynamic image, the GPU generates the image data of the picture to be displayed to provide the image data to the display, or the GPU generates the image data of the picture to be displayed. image data to provide the image data to the display, and the encoder to generate compressed data of the picture to be displayed according to the compression scheme;

Wherein, the GPU generates the image data of the picture to be displayed in real time based on reading the source data of the picture to be displayed; the encoder generates the compressed data of the picture to be displayed based on reading The image data of the picture to be displayed is generated in real time.
The low-power processing device for providing image data to a display according to claim 1, wherein determining that the picture to be displayed has no change or that the picture to be displayed is a static image further includes:

The CPU determines that the source data of the picture to be displayed is the same as the source data of the previous frame to determine that there is no change in the picture to be displayed or that the picture to be displayed is a static image;

Determining that the picture to be displayed changes or that the picture to be displayed is a dynamic image further includes:

The CPU determines that the picture to be displayed has changed or that the picture to be displayed is a dynamic image by judging that the source data of the picture to be displayed is different from the source data of the previous frame.
The low-power processing device for providing image data to a display according to claim 2, wherein determining that the picture to be displayed has no change or that the picture to be displayed is a static image further includes:

The CPU sets the source data update flag to an invalid state to indicate that there is no change in the picture to be displayed or that the picture to be displayed is a static image;

Determining that the picture to be displayed changes or that the picture to be displayed is a dynamic image further includes:

The CPU sets the source data update flag to a valid state to indicate that the picture to be displayed has changed or that the picture to be displayed is a dynamic image.
The low-power processing device for providing image data to a display according to claim 3, wherein determining that the picture to be displayed has no change or that the picture to be displayed is a static image further includes:

The GPU checks that the source data update mark is in an invalid state;

Determining that the picture to be displayed changes or that the picture to be displayed is a dynamic image further includes:

The GPU checks that the source data update flag is valid.
The low-power processing device for providing image data to a display according to claim 3, wherein the determining whether the compressed data of the picture to be displayed is prepared further includes:

The GPU determines whether the compressed data of the picture to be displayed is prepared by checking whether the compressed frame flag is in a valid state; the compressed frame flag is used to indicate whether the compressed data is prepared. The encoder completes the compression of a frame of picture. The compressed frame flag is set to a valid state after the data is transmitted, and is set to an invalid state at the beginning of compression encoding.
The low-power processing device for providing image data to a display according to claim 5, wherein the GPU checks that the source data update flag is in an invalid state, and then checks that the compressed frame flag is in a valid state, then the The GPU controls the decoder to start working.
The low-power processing device for providing image data to a display according to claim 5, wherein the GPU checks that the source data update flag is in a valid state, or that the source data update flag is in an invalid state and the If the compressed frame flag is in an invalid state, the GPU controls the encoder to start working.
The low-power processing device for providing image data to a display according to claim 3, wherein the step of determining that the picture to be displayed has no change or that the picture to be displayed is a still image and that the picture to be displayed has changed or that the picture to be displayed is Moving images, further including:

After acquiring the source data of the picture to be displayed, the CPU compares whether the source data of the picture to be displayed is the same as the source data of the previous frame. If not, the CPU compares the source data of the picture to be displayed to the source data of the picture to be displayed. The data is written into the memory, and the source data update flag is set to a valid state. If so, the source data of the picture to be displayed is not written into the memory, and the source data update flag is set to an invalid state.
The low-power processing device for providing image data to a display according to claim 3, wherein the step of determining that the picture to be displayed has no change or that the picture to be displayed is a still image and that the picture to be displayed has changed or that the picture to be displayed is Moving images, further including:

When the CPU starts to refresh the frame to be displayed, it determines whether it has received the updated source data of the frame to be displayed. If so, it writes the source data of the frame to be displayed into the memory and sets the source data update Mark as a valid state, if not, set the source data update mark as an invalid state; the source data of the updated picture to be displayed includes the source data received closest to the moment when the picture to be displayed is refreshed and is different from the source data of the previous frame. source data.
The low-power processing device for providing image data to a display according to claim 1, wherein the compression scheme includes an RLE algorithm; the encoder includes an RLE encoder; and the decoder includes an RLE decoder.

11. The low-power processing device for providing image data to a display according to claim 1, wherein the encoder writes the compressed data of the picture to be displayed into the memory; the decoder reads the compressed data from the image data to be displayed. The memory reads the compressed data of the picture to be displayed, or the GPU reads the compressed data of the picture to be displayed from the memory and sends it to the decoder.

12. The low-power processing device for providing image data to a display as claimed in claim 1, further comprising:

A pixel cache is used to store image data generated by the GPU and provide the image data to the encoder.

13. The low-power processing device for providing image data to a display as claimed in claim 1, further comprising:

A line cache is used to store the image data generated by the GPU and the image data decompressed by the decoder, and provide the image data to the display.

14. A low-power processing method for providing image data to a display, characterized by comprising:

If it is determined that the picture to be displayed has no change or the picture to be displayed is a still image, then it is determined whether the compressed data of the picture to be displayed is prepared. If so, decompression is started to provide the image data of the picture to be displayed to the display; if not , then the image data of the picture to be displayed is generated to provide it to the display, and compression is started, and the compressed data of the picture to be displayed is generated according to the compression scheme; the decompression is to convert the picture to be displayed according to the compression scheme. The compressed data of the display screen is decompressed into image data;

If it is determined that the picture to be displayed changes or the picture to be displayed is a dynamic image, the image data of the picture to be displayed is generated to provide the image data to the display; or the image data of the picture to be displayed is generated to provide the image data to the display. The display provides the image data, starts compression, and generates compressed data of the picture to be displayed according to the compression scheme;

Wherein, the generating the image data of the picture to be displayed is generated in real time based on reading the source data of the picture to be displayed; the generating the compressed data of the picture to be displayed is based on reading the source data of the picture to be displayed. The image data of the display screen is generated in real time.

15. The low-power processing method for providing image data to a display as claimed in claim 14, wherein determining that the picture to be displayed has no change or that the picture to be displayed is a still image further includes:

By judging that the source data of the picture to be displayed is the same as the source data of the previous frame, it is determined that the picture to be displayed has no change or that the picture to be displayed is a static image;

Determining that the picture to be displayed changes or that the picture to be displayed is a dynamic image further includes:

By judging that the source data of the picture to be displayed is different from the source data of the previous frame, it is determined that the picture to be displayed has changed or that the picture to be displayed is a dynamic image.

16. The low-power processing method for providing image data to a display as claimed in claim 15, wherein determining that the picture to be displayed has no change or that the picture to be displayed is a static image further includes:

Set the source data update flag to an invalid state to indicate that there is no change in the image to be displayed or that the image to be displayed is a static image;

Determining that the picture to be displayed changes or that the picture to be displayed is a dynamic image further includes:

Set the source data update flag to a valid state to indicate that the picture to be displayed has changed or that the picture to be displayed is a dynamic image.

17. The low-power processing method for providing image data to a display as claimed in claim 16, wherein determining that the picture to be displayed has no change or that the picture to be displayed is a static image further includes:

Check that the source data update mark is invalid;

Determining that the picture to be displayed changes or that the picture to be displayed is a dynamic image further includes:

Check that the source data updates are marked as valid.

18. The low-power processing method for providing image data to a display according to claim 17, wherein the determining whether the compressed data of the picture to be displayed is prepared further includes:

By checking whether the compressed frame flag is in a valid state, it is determined whether the compressed data of the picture to be displayed is prepared; the compressed frame flag is used to indicate whether the compressed data is prepared. After the compressed data of a frame of picture is completed, the compressed frame flag is is set to the valid state, and the compressed frame flag is set to the invalid state at the beginning of compression encoding.

19. The low-power processing method for providing image data to a display as claimed in claim 18, wherein said initiating decompression further includes:

If it is checked that the source data update flag is in an invalid state and the compressed frame flag is in a valid state, decompression is started.

20. The low-power processing method for providing image data to a display as claimed in claim 18, wherein said initiating compression further includes:

If it is checked that the source data update mark is in a valid state, or the source data update mark is in an invalid state and the compressed frame flag is in an invalid state, compression is started.

21. The low-power processing method for providing image data to a display according to claim 14, wherein generating the compressed data of the picture to be displayed further includes:

Write the compressed data to memory.

22. The low-power processing method for providing image data to a display as claimed in claim 16, wherein the step of determining that the image to be displayed has no change or that the image to be displayed is a still image and determining that the image to be displayed has changed or is to be displayed. The screen is a dynamic image, further including:

After obtaining the source data of the picture to be displayed, compare whether the source data of the picture to be displayed is the same as the source data of the previous frame. If not, write the source data of the picture to be displayed into the memory, and The source data update flag is set to a valid state. If so, the source data of the picture to be displayed is not written into the memory, and the source data update flag is set to an invalid state.

23. The low-power processing method for providing image data to a display as claimed in claim 16, wherein the step of determining that the image to be displayed has no change or that the image to be displayed is a still image and determining that the image to be displayed has changed or is to be displayed. The screen is a dynamic image, further including:

When starting to refresh the frame to be displayed, it is determined whether the source data of the updated frame to be displayed is received, and if so, the source data of the frame to be displayed is written into the memory, and the source data update flag is set to a valid state, If not, set the source data update mark to an invalid state;

The updated source data of the picture to be displayed includes source data received closest to the moment when the picture to be displayed is refreshed and is different from the source data of the previous frame of picture.

24. The low-power processing method for providing image data to a display according to claim 14, wherein the compression scheme includes an RLE algorithm.

25. An image display device, characterized by comprising the low-power processing device according to any one of claims 1 to 13, and a display connected to the low-power processing device.