CN110673816B - Low-cost method for refreshing display screen by using video memory - Google Patents
Low-cost method for refreshing display screen by using video memory Download PDFInfo
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- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
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Abstract
The invention relates to the technical field of a method for refreshing a display screen, and discloses a method for refreshing a display screen by using a low-cost video memory, which comprises the display screen, a processing device, a cache device, a control unit, a first transmission channel and a second transmission channel; the method comprises the following specific steps: 1) the image enters a processing device, and the processing device converts the image into a byte data stream; the image is converted into byte data stream, the byte data stream is transmitted to the cache device from the processing device, the cache device converts the byte data stream into cache data stream, the cache data stream is provided with a starting signal, when the starting signal triggers the display trigger, the cache data stream completely enters the display screen, the display screen is started, the excitation block corresponding to the pixel point is excited by the excitation signal on the cache data stream, the pixel point is excited, and therefore the image is directly displayed on the display screen at one time without refreshing line by line, good image refreshing display effect on the display screen is guaranteed, an external memory is not needed, and the cost is low.
Description
Technical Field
The invention relates to the technical field of a method for refreshing a display screen, in particular to a method for refreshing the display screen by using a low-cost video memory.
Background
Intellectualization and color screen are becoming the development direction of the current automobiles, and the requirements of the automobile electronic market on TFT-LCD screens are rising sharply; the number of TFT-LCD screens in automobiles is also increasing, such as automobile gauges, navigation, temperature displays, time displays, weather displays, song displays, and the like.
At present, the data of the screen refreshing is read from an external storage device byte by byte, and is directly displayed on a TFT-LCD screen byte by byte, and under the conditions of limited MCU computing capacity, enlarged TFT display area and improved display requirement, the current driving method cannot meet the display screen refreshing rate during the refreshing conversion of the display screen.
In the prior art, in order to enhance the refreshing display effect, the computing power of the used MCU is generally increased, or an external expansion RAM chip is used to meet the refreshing display effect during interface switching, so that the cost is too high; moreover, the size of the chip is increased, the number of the chips is increased, so that an embedded system becomes more complex, the miniaturization of embedded equipment is not facilitated, and the manufacture of the embedded equipment is not facilitated; and the existing display screen needs to be refreshed line by line, so that the refreshing display effect is not good enough.
Disclosure of Invention
The invention aims to provide a low-cost method for refreshing a display screen by using a display memory, and aims to solve the problem that the display effect is not good due to the fact that the conventional display screen needs to be refreshed line by line.
The invention is realized in this way, the low-cost method of refreshing the display screen of the display memory, including display screen, processing unit, buffer memory device, control unit, first transmission channel and second transmission channel; the processing device, the first transmission channel, the cache device and the display screen are connected in sequence; the control unit controls the processing device and the cache device, and comprises the following specific steps:
1) the image enters a processing device, and the processing device converts the image into a byte data stream;
2) the first transmission channel is provided with a first input end connected with the processing device and a first output end connected with the cache device, and the processing device drives the byte data stream to be transmitted in a single direction; the processing device drives the byte data stream to enter the first input end, enter the first transmission channel and output to the cache device from the first output end;
3) the first output end is provided with a processing trigger which is electrically connected with the control unit, the processing device and the cache device respectively; the tail part of the byte data stream, which deviates from the processing device, is provided with an end signal, the byte data stream enters the cache device from the first transmission channel until the end signal triggers the processing trigger, the processing trigger sends a signal to the control unit, and the control unit drives the processing device to stop running;
4) the second transmission channel is provided with a second input end and a second output end; the buffer device comprises a storage block for storing the byte data stream and a converter for converting the byte data stream; the processing device comprises a storage part, the storage part comprises a first storage body and a second storage body, the storage block is connected with a channel of the second storage body to form a storage, the converter is connected with the channel of the storage, and the storage is connected with the first output end and the second input end; the display screen is connected with the second output end; the byte data stream is converted by the converter in the storage to be converted into a cache data stream, the tail part of the cache data stream is provided with a starting signal, and the cache data stream is input from the second input end, passes through the second output end and enters the display screen;
5) the display screen is provided with a display trigger, and the display trigger is electrically connected with the control unit, the cache device and the display screen; when the cache data stream flows into the display screen from the second output end, the starting signal triggers the display trigger, the display trigger sends a signal to the control unit, and the control unit drives the cache device to stop running and drives the display screen to start;
6) the cache data stream is provided with a plurality of excitation signals, the display screen is provided with a plurality of pixel points and a plurality of excitation blocks, and the pixel points are electrically connected with the excitation blocks one by one; the display screen is provided with a plurality of display channels, and a plurality of pixel points and a plurality of excitation blocks are arranged in the display channels; the excitation signal is driven by the cache data stream to trigger the excitation blocks one by one, and a plurality of pixel points are excited; when the starting signal triggers the display trigger, the pixel points on the display screen are excited, and images are displayed on the display screen.
Further, the processing device comprises a first processing piece and a second processing piece with a decoding block, wherein the first processing piece is connected with the second processing piece in a channel mode; the first processing piece and the second processing piece are respectively electrically connected with the control unit; the first processing element converts the image into a binary file, and the decoding block decodes the binary file into a byte data stream after regularization.
Furthermore, the processing device further comprises an output part, and the first processing part, the second processing part, the first storage body and the output part are sequentially connected; the first storage is used for transferring the byte data stream to the output part, and the output part is connected with the first input end and outputs the byte data stream to the first input end.
Further, the first input end is provided with a data gate, and the data gate covers the first input end; the data door is provided with a transmission exciter electrically connected with the data switch, and the transmission exciter drives the data door to be opened and closed; the head of the byte data stream, which is far away from the end signal, is provided with a start signal, the start signal is used for exciting the transmission trigger, and the data gate is opened after being excited.
Furthermore, the display screen is provided with a splitter connected with the second output end, the splitter is provided with a plurality of corresponding holes, the corresponding holes are communicated to the display channel, the cache data stream is provided with a plurality of sections of characteristic data streams, and the characteristic data streams are provided with characteristic parts with the same size as the corresponding holes; the starting signal is positioned on the tail characteristic data stream; when the feature bits are aligned with the corresponding holes, the feature data stream with the feature bits flows into the display channel.
Further, the excitation signal in the step (6) is a double-byte signal, the double-byte signal includes an open block and a closed block, and the open block is connected with the closed block; the excitation block is provided with an accommodating cavity for accommodating the opening block and the closing block, and when the accommodating cavity is embedded into the opening block and the closing block at the same time, the pixel points are excited to drive the display screen to display images.
Further, the starting signal is a double-byte signal; when the opening block and the closing block of the starting signal are respectively embedded into the accommodating space, the display screen completely displays the image.
Further, a plurality of the pixel points are arranged in the display channel at intervals.
Further, the storage block is a RAM.
Further, the display screen is a TFT-LCD screen.
Compared with the prior art, the low-cost display screen refreshing method for the display memory, provided by the invention, has the advantages that the image is converted into the byte data stream, the byte data stream is transmitted to the cache device from the processing device, the cache device converts the byte data stream into the cache data stream, the cache data stream is provided with the starting signal, when the starting signal triggers the display trigger, the cache data stream completely enters the display screen, the display screen is started, the excitation block corresponding to the pixel point is excited by the excitation signal on the cache data stream, and the pixel point is excited, so that the image is directly displayed on the display screen for one time without refreshing line by line, the good image refreshing display effect on the display screen is ensured, an external memory is not needed, and the cost is low.
Drawings
FIG. 1 is a schematic diagram illustrating the steps of a method for refreshing a display screen with a low-cost video memory according to the present invention;
FIG. 2 is a schematic diagram of electrical connections between various components provided by the present invention;
fig. 3 is a schematic diagram of a data transmission method provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-3, preferred embodiments of the present invention are shown.
The low-cost method for refreshing the display screen by using the video memory is not only based on the AT32F403 single chip microcomputer or other single chip microcomputers, but is preferably based on the AT32F403 single chip microcomputer.
The method for refreshing the display screen by using the video memory at low cost comprises the steps of displaying the screen, a processing device, a caching device, a control unit, a first transmission channel and a second transmission channel; the processing device, the first transmission channel, the cache device and the display screen are sequentially connected; the control unit controls the processing device and the cache device, and comprises the following specific steps:
1) the image enters a processing device, and the processing device converts the image into a byte data stream;
2) the first transmission channel is provided with a first input end connected with the processing device and a first output end connected with the cache device, and the processing device drives the byte data stream to be transmitted in a single direction; the processing device drives the byte data stream to enter a first input end, enter a first transmission channel and output to the cache device from a first output end;
3) the first output end is provided with a processing trigger which is respectively and electrically connected with the control unit, the processing device and the cache device; the tail part of the byte data stream departing from the processing device is provided with an end signal, the byte data stream enters the cache device from the first transmission channel until the end signal triggers the processing trigger, the processing trigger sends a signal to the control unit, and the control unit drives the processing device to stop running;
4) the second transmission channel is provided with a second input end and a second output end; the buffer device comprises a storage block for storing byte data streams and a converter for converting the byte data streams; the processing device comprises a storage part, wherein the storage part comprises a first storage body and a second storage body, a storage block is connected with a channel of the second storage body to form a storage device, a converter is connected with the channel of the storage device, and the storage device is connected with a first output end and a second input end; the display screen is connected with the second output end; the byte data stream is converted by the converter in the memory and converted into a cache data stream, the tail part of the cache data stream is provided with a starting signal, and the cache data stream is input from the second input end, passes through the second output end and enters the display screen;
5) the display screen is provided with a display trigger which is electrically connected with the control unit, the cache device and the display screen; when the cache data stream flows into the display screen from the second output end, the starting signal triggers the display trigger, the display trigger sends a signal to the control unit, and the control unit drives the cache device to stop running and drives the display screen to start;
6) the cache data stream is provided with a plurality of excitation signals, the display screen is provided with a plurality of pixel points and a plurality of excitation blocks, and the pixel points are electrically connected with the excitation blocks one by one; the display screen is provided with a plurality of display channels, a plurality of pixel points and a plurality of excitation blocks are arranged in the display channels; the excitation signal is driven by the cache data stream to trigger the excitation blocks one by one, and a plurality of pixel points are excited; when the starting signal triggers the display trigger, the pixel points on the display screen are excited, and the image is displayed on the display screen.
The image is converted into byte data stream, the byte data stream is transmitted to the cache device from the processing device, the cache device converts the byte data stream into cache data stream, the cache data stream is provided with a starting signal, when the starting signal triggers the display trigger, the cache data stream completely enters the display screen, the display screen is started, the excitation block corresponding to the pixel point is excited by the excitation signal on the cache data stream, the pixel point is excited, and therefore the image is directly displayed on the display screen at one time without refreshing line by line, good image refreshing display effect on the display screen is guaranteed, an external memory is not needed, and the cost is low.
The processing device comprises a first processing piece and a second processing piece with a decoding block, wherein the first processing piece is connected with the second processing piece through a channel; the first processing piece and the second processing piece are respectively electrically connected with the control unit; the first processing element converts the image into a binary file, and the decoding block decodes the binary file into a byte data stream through regularization.
The decoding method of the decoding block is to convert a Bin file, i.e. a binary file, into a Hex code file, and thus into a byte data stream, wherein the byte data stream is based on a machine language and is represented as a 01 type.
The processing device also comprises a storage part and an output part, wherein the first processing part, the second processing part, the storage part and the output part are sequentially connected; the storage element is used for transferring the byte data stream to the output element, the output element is connected with the first input end, and the byte data stream is output to the first input end; the storage part is spiFlash or other storage media, preferably spiFlash, and the output part is an output interface; the first processing element and the second processing element are respectively formed by combining an arithmetic unit and a controller.
The first input end is provided with a data gate which covers the first input end; the data door is provided with a transmission exciter which is electrically connected with the data switch, and the transmission exciter drives the data door to be switched; the head of the byte data stream departing from the end signal is provided with a start signal, the start signal is used for exciting the transmission trigger, and the data gate is opened after being excited; the data gate is preferably a conditional control gate which is opened only when the condition of the conditional control gate is met.
The display screen is provided with a flow divider connected with the second output end, the flow divider is provided with a plurality of corresponding holes, the corresponding holes are communicated to the display channel, the cache data stream is provided with a plurality of sections of characteristic data streams, and the characteristic data streams are provided with characteristic parts with the same sizes as the corresponding holes; the starting signal is positioned on the tail characteristic data stream; when the characteristic bit is matched with the corresponding hole, the characteristic data stream with the characteristic bit flows into the display channel; the flow divider is a condition controller, and when the characteristic bits correspond to the corresponding holes one by one, the characteristic data stream can flow into the corresponding display channel from the corresponding holes; the problem of display errors is prevented.
More specifically, the splitter may be a plurality of condition controllers, and one feature data stream may be subjected to condition judgment by the plurality of condition controllers, that is, judgment in a digital form, and a mathematical method is not the patent content of the invention, and thus is not described herein again.
The excitation signal in the step (6) is a double-byte signal, the double-byte signal comprises an open block and a closed block, and the open block is connected with the closed block; the excitation block is provided with an accommodating cavity for accommodating the opening block and the closing block, and when the accommodating cavity is embedded into the opening block and the closing block at the same time, the pixel points are excited to drive the display screen to display images; wherein the open block is an open signal, i.e., a 1 signal, and the closed block is a closed signal, i.e., a 0 signal.
The starting signal is a double-byte signal; when the opening block and the closing block of the starting signal are respectively embedded into the accommodating space, the display screen completely displays images.
For better display effect, a plurality of pixel points are arranged in the display channel at intervals; the storage block is a RAM, preferably a RAM with 96Kb video memory.
Wherein the video memory size of the second memory bank is 128 Kb; therefore, the memory size is 224 Kb.
The first transmission channel and the second transmission channel are performed in a DMA mode, wherein the storage element is a memory, and the connection mode between the storage block and the second storage body is the DMA mode.
DMA, i.e. direct memory access, transfers copy data from one address space to another. When the CPU initiates the transfer, the transfer itself is performed and completed by the DMA controller.
The display screen is a TFT-LCD screen or other liquid crystal screens, the liquid crystal screen takes liquid crystal material as a basic component, the liquid crystal material is filled between two parallel plates, the arrangement state of the inner molecules of the liquid crystal material is changed through voltage, so that the purposes of shading and transmitting light are achieved to display images with different depths and different faults, and color images can be displayed only by adding a three-component color filter layer between the two flat plates, so that the display screen is very convenient.
The type of the singlechip is preferably AT32F403 singlechip, which is provided with a control unit, and the control unit is 32 bits
A kernel with a core operation speed of 200 MHz; the built-in single precise Floating Point Unit (FPU) and the Digital Signal Processor (DSP) have a clock control mechanism and can meet the application of various fields.
The RAM is located in the single chip microcomputer, and the storage piece is a self-contained module on the single chip microcomputer, so that a DMA mode is used by default in internal communication between the RAM and the storage piece.
In another embodiment, as shown in fig. 3, the byte data stream is input to the RAM inside the single chip microcomputer through spiFlash, and the RAM inside the single chip microcomputer converts the byte data stream into a cache data stream and then displays an image on the display screen in a manner of directly transmitting the cache data stream to the display screen; the spiFlash is transmitted to the RAM in a DMA mode, and the RAM is transmitted to the display screen in a DMA mode.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The method for refreshing the display screen by using the video memory with low cost is characterized by comprising the display screen, a processing device, a caching device, a control unit, a first transmission channel and a second transmission channel; the processing device, the first transmission channel, the cache device and the display screen are connected in sequence; the control unit controls the processing device and the cache device, and the control unit comprises the following specific steps:
1) the image enters a processing device, and the processing device converts the image into a byte data stream;
2) the first transmission channel is provided with a first input end connected with the processing device and a first output end connected with the cache device, and the processing device drives the byte data stream to be transmitted in a single direction; the processing device drives the byte data stream to enter the first input end, enter the first transmission channel and output to the cache device from the first output end;
3) the first output end is provided with a processing trigger which is electrically connected with the control unit, the processing device and the cache device respectively; the tail part of the byte data stream departing from the processing device is provided with an end signal, the byte data stream enters the cache device from the first transmission channel until the end signal triggers the processing trigger, the processing trigger sends a signal to the control unit, and the control unit drives the processing device to stop running;
4) the second transmission channel is provided with a second input end and a second output end; the buffer device comprises a storage block for storing the byte data stream and a converter for converting the byte data stream; the processing device comprises a storage part, the storage part comprises a first storage body and a second storage body, the storage block is connected with a channel of the second storage body to form a storage, the converter is connected with the channel of the storage, and the storage is connected with the first output end and the second input end; the display screen is connected with the second output end; the byte data stream is converted by the converter in the storage to be converted into a cache data stream, the tail part of the cache data stream is provided with a starting signal, and the cache data stream is input from the second input end, passes through the second output end and enters the display screen;
5) the display screen is provided with a display trigger, and the display trigger is electrically connected with the control unit, the cache device and the display screen; when the cache data stream flows into the display screen from the second output end, the starting signal triggers the display trigger, the display trigger sends a signal to the control unit, and the control unit drives the cache device to stop running and drives the display screen to start;
6) the cache data stream is provided with a plurality of excitation signals, the display screen is provided with a plurality of pixel points and a plurality of excitation blocks, and the pixel points are electrically connected with the excitation blocks one by one; the display screen is provided with a plurality of display channels, and a plurality of pixel points and a plurality of excitation blocks are arranged in the display channels; the excitation signal is driven by the cache data stream to trigger the excitation blocks one by one, and a plurality of pixel points are excited; when the starting signal triggers the display trigger, the pixel points on the display screen are excited, and images are displayed on the display screen.
2. The method for refreshing a display screen by using a video memory as claimed in claim 1, wherein the processing device comprises a first processing element and a second processing element with a decoding block, and the first processing element is connected with the second processing element through a channel; the first processing piece and the second processing piece are respectively electrically connected with the control unit; the first processing element converts the image into a binary file, and the decoding block decodes the binary file into a byte data stream after regularization.
3. The method for refreshing a display screen by using a video memory as claimed in claim 2, wherein the processing device further comprises an output device, and the first processing device, the second processing device, the first storage and the output device are connected in sequence; the first storage body is used for transferring the byte data stream to the output piece, and the output piece is connected with the first input end and outputs the byte data stream to the first input end.
4. The method for refreshing a display screen by using a video memory according to any one of claims 1 to 3, wherein the first input end is provided with a data gate, and the data gate covers the first input end; the data door is provided with a transmission exciter which is electrically connected with the data switch, and the transmission exciter drives the data door to be switched; the head of the byte data stream, which is far away from the end signal, is provided with a start signal, the start signal is used for exciting the transmission trigger, and the data gate is opened after being excited.
5. The method for refreshing a display screen by using a low-cost video memory as claimed in any one of claims 1 to 3, wherein the display screen is provided with a splitter connected to the second output end, the splitter is provided with a plurality of corresponding holes, the corresponding holes are communicated to the display channel, the cache data stream is provided with a plurality of sections of feature data streams, and the feature data streams are provided with features with the same size as the corresponding holes; the starting signal is positioned on the tail characteristic data stream; when the feature bits are paired with the corresponding holes, the feature data stream with the feature bits flows into the display channel.
6. The method according to any of claims 1-3, wherein the trigger signal in step (6) is a double-byte signal, the double-byte signal comprises an open block and a closed block, and the open block is connected to the closed block; the excitation block is provided with an accommodating cavity for accommodating the opening block and the closing block, and when the accommodating cavity is embedded into the opening block and the closing block at the same time, the pixel points are excited to drive the display screen to display images.
7. The method for refreshing a display screen with low cost video memory according to claim 6, wherein the start signal is a double byte signal; when the opening block and the closing block of the starting signal are respectively embedded into the accommodating space, the display screen completely displays the image.
8. The method for refreshing a display screen by using a low-cost video memory as claimed in any one of claims 1 to 3, wherein a plurality of the pixel points are arranged in the display channel at intervals.
9. The method for refreshing a display screen by utilizing a video memory according to any one of claims 1 to 3, wherein the storage block is a RAM.
10. The method for refreshing a display screen by using a low-cost video memory as claimed in any one of claims 1 to 3, wherein the display screen is a TFT-LCD screen.
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