CN216287522U - Display driving circuit for image and instruction synchronization - Google Patents
Display driving circuit for image and instruction synchronization Download PDFInfo
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- CN216287522U CN216287522U CN202122142417.XU CN202122142417U CN216287522U CN 216287522 U CN216287522 U CN 216287522U CN 202122142417 U CN202122142417 U CN 202122142417U CN 216287522 U CN216287522 U CN 216287522U
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Abstract
The utility model discloses a display driving circuit for synchronizing images and instructions, which comprises a definition unit, a judgment unit and a control unit. The defining unit is used for defining the area range of the instruction set in the image in advance. The determining unit is coupled to the defining unit for determining whether the command is enabled and the type thereof. The control unit is coupled with the judgment unit. If the judgment result of the judgment unit is yes, the control unit identifies the instruction and executes the instruction to switch the state of the display driving circuit and transmit the image before the display driving circuit transmits the next frame of picture.
Description
Technical Field
The present invention relates to a display driving circuit, and more particularly, to a display driving circuit for synchronizing an image with an instruction.
Background
In the process of dynamic image output by matching various display systems with a display driver IC and a fluorescent screen, along with the increasing diversification of the functions of the display driver IC, in some application scenarios (for example, smart phones), the system end needs to send a Command (Command) to the display driver IC to enable the display driver IC to be in a certain specific display state, and meanwhile, the system end needs to send a processed specific image corresponding to the specific display state at a precise moment, so that the processed specific image and the specific display state of the display driver IC can synchronously take effect and be output to the fluorescent screen end for display/presentation, thereby achieving the expected display effect.
However, if the command and the image data sent by the system end are not synchronized, for example, the command and the image are shifted by N frames (N >3), the display effect of the final screen end cannot meet the expectation, and phenomena such as screen flashing or delay are caused, which can be roughly divided into the following two cases:
(1) as shown in fig. 1, the image data DAT sent by the system AP is faster than the state switch command CMD, so that the memory RAM is first switched from the state a to the state B, but the display driving circuit IC does not yet switch the state and remains in the state a, which may be caused by the fact that the image data DAT output by the system AP is not accurately controlled to start to be refreshed at the time point corresponding to the effective state switch command CMD, and the two cannot be synchronously effective, so that the expected display effect cannot be obtained.
(2) As shown in fig. 2, the state switching command CMD sent by the system AP is faster than the image data DAT, so that the display driving circuit IC is switched from the state a to the state B first, but the memory RAM is not yet switched to maintain the state a, which may be caused by a delay in outputting the image data DAT due to an excessively busy image processing unit of the system AP, so that the two cannot be synchronized to achieve the desired display effect.
SUMMERY OF THE UTILITY MODEL
The utility model provides a display driving circuit for synchronizing images and instructions, which can ensure that the display driving circuit receives state switching instructions and image data at the same time (in the same frame), thereby achieving synchronous response of image refreshing and switching states, and effectively avoiding unexpected display effect caused by asynchronous state switching of display image content and the display driving circuit in the prior art.
A preferred embodiment according to the present invention is a display driver circuit for image and command synchronization. In this embodiment, the display driving circuit includes a definition unit, a determination unit, and a control unit. The defining unit is used for defining the area range of the instruction set in the image in advance. The determining unit is coupled to the defining unit and configured to determine whether the instruction can be executed and the type of the instruction. The control unit is coupled with the judgment unit. If the judgment result of the judgment unit is yes, the control unit identifies the instruction and executes the instruction to switch the state of the display driving circuit and transmit the image before the display driving circuit transmits the next frame of picture.
In an embodiment, if the determination result of the determining unit is negative, the control unit maintains the state of the display driving circuit and transmits the image according to the normal flow.
In one embodiment, the display driving circuit is coupled to the system terminal, the command is a state switching command, and the system terminal encrypts the command in a specific area of the image and then synchronously transmits the encrypted command to the display driving circuit.
In one embodiment, when the display driving circuit receives an image, the display driving circuit decodes an instruction from a specific region of the image to control a subsequent switching timing.
In one embodiment, the display driving circuit is coupled to the display unit. When the display driving circuit is switched from the first state to the second state and simultaneously transmits an image to the display unit, the display unit displays the image in the second state.
In one embodiment, the specific area of the image corresponds to a non-effective display area of the display unit.
In one embodiment, the inactive display area is selected from at least one of a Notch area, a rounded corner area, a blind hole area, and an under-screen fingerprint identification area.
In one embodiment, the specific area of the image corresponds to an effective display area of the display unit.
In one embodiment, the active display area is at least one data area of the status bar.
In one embodiment, the definition unit further uses a predefined area range as a start/end position of the instruction set, and the start area of the instruction set adopts a specific data format, which sequentially comprises a header, a first instruction, a second instruction, …, and a cyclic redundancy check.
Compared with the prior art, the display driving circuit for synchronizing the image and the instruction provided by the utility model can encrypt the state switching instruction in the specific area of the image data through the system end and synchronously transmit the state switching instruction to the display driving circuit, and then the display driving circuit decodes the state switching instruction from the image data so as to ensure that the display driving circuit can receive the instruction and the image data at the same time (in the same frame), thereby achieving synchronous response of image brushing and switching state, avoiding unexpected display effect caused by asynchronous display image content and display driving circuit state in the process of switching the state of the display driving circuit, and effectively solving the problems in the prior art.
Drawings
FIG. 1 is a diagram illustrating that images are faster than instructions and thus cannot be synchronously validated in the prior art.
FIG. 2 is a diagram illustrating the failure of synchronous validation of instructions faster than images in the prior art.
FIG. 3 is a flowchart illustrating the display driving circuit according to the present invention for synchronizing the image and the command.
Fig. 4 is a schematic diagram illustrating the system side encrypting the state switching command to the specific area of the image data. FIG. 5 is a diagram illustrating the driving circuit decoding a state switching command from a specific region of image data.
Fig. 6 is a schematic diagram of a specific region of image data corresponding to a non-effective display region of a display unit.
Fig. 7 is a schematic diagram of a specific region of image data corresponding to an effective display region of a display unit.
FIG. 8 is a diagram illustrating a specific area of the image data encrypted by the status switch command and corresponding to the notch and corner areas of the display unit.
Fig. 9 is a schematic diagram of the present invention for implementing synchronous validation of image data and status switching commands.
FIG. 10 is a diagram of a specific data format for the start area of an instruction set.
FIG. 11 is a functional block diagram of a display driving circuit according to the present invention.
Description of the main element symbols:
S10-S18 …
AP … System side
CMD … state switching command
DAT … image data
RAM … memory
IC … display driving circuit
K … specific region
HDR … header
CMD1 … first Command
CMD2 … second instruction
CRC … cyclic redundancy check
1 … display driving circuit
10 … definition Unit
12 … judging unit
14 … control unit
PL … display cell
Detailed Description
A preferred embodiment according to the present invention is a display driver circuit for image and command synchronization. In this embodiment, the display driver circuit can be applied to an electronic device with a display function (e.g., a smart phone) and the display driver circuit can be coupled between a system end (e.g., an application operating system) and a display unit (e.g., a display panel), but not limited thereto.
Referring to fig. 3, fig. 3 is a flowchart illustrating the display driving circuit in this embodiment to synchronize the image and the command, and may include the following steps:
step S10: the display driving circuit defines the area range of the instruction set in the image in advance;
step S12: the display driving circuit judges whether the command is enabled or not and the type of the command;
step S14: if the judgment result of the step S12 is yes, displaying a driving circuit identification command;
step S16: before the display driving circuit transmits the next frame of picture, the display driving circuit executes an instruction to switch the state of the display driving circuit and transmits an image; and
step S18: if the determination result in the step S12 is negative, the display driving circuit is not changed in state and the image is transmitted according to the normal flow.
In practical applications, as shown in fig. 4, the command may be a state switching command CMD for switching the display driving circuit IC from the state a to the state B, and the state switching command CMD is encrypted in the specific area K of the image data DAT in the state B by the system side AP and then synchronously transmitted to the display driving circuit IC. As shown in fig. 5, when the display drive circuit IC receives the image data DAT in the state B, the display drive circuit decodes a state switching command CMD from a specific region K of the image data DAT to control the subsequent switching timing. Since the display driving circuit IC can completely control the response timing of the state switching command CMD and the image data DAT, the image data DAT and the state switching command CMD can be simultaneously activated and output to the display unit for display/presentation, thereby achieving a desired display effect.
It should be noted that the specific region K of the image data DAT may correspond to an effective display region or a non-effective display region of a display unit (e.g., a display panel).
As shown in fig. 6, if the specific area of the image corresponds to a non-effective display area of the display unit, it may correspond to at least one of a Notch (Notch) area, a rounded corner area, a blind hole area, and an under-screen fingerprint recognition area of the display unit. As shown in fig. 7, if the specific region of the image corresponds to the effective display region of the display unit, it may correspond to at least one data region (1 st to N th) of the status bar of the display unit, and by designing an instruction set similar to the color/gray scale data of the status bar, it is possible to avoid the obvious display difference and to clearly read/recognize the instruction. For example, as shown in fig. 8, the state switch command CMD may be encrypted in a specific area of the image data corresponding to a Notch (Notch) area and a fillet area of the display unit, but not limited thereto.
As shown in fig. 9, compared to the problem that command and image asynchronization is easily generated in the prior art, the system side AP of the present invention encodes a state switching command CMD for switching the display driving circuit IC from the state a to the state B, adds the encoded state switching command CMD to a specific area K of the image data DAT in the state B, and synchronously transmits the image data DAT and the state switching command CMD to the display driving circuit IC. When the display driving circuit IC receives the image data DAT, the display driving circuit IC decodes the state switching command CMD from the specific region K of the image data DAT. Since the display driving circuit IC can completely grasp the response timing of the state switching command CMD and the image data DAT, the state switching command CMD and the state switching command CMD can be validated synchronously and output to a display unit (e.g., a display panel) for display/presentation, thereby achieving a desired display effect.
In practical applications, step S10 further includes: according to the area range defined in advance as the start/end position of the instruction set, and as shown in fig. 10, the start area of the instruction set adopts a specific data format, for example, it may sequentially include a Header (Header) HDR, a first instruction CMD1, a second instruction CMD2, …, a Cyclic Redundancy Check (Cyclic Redundancy Check) CRC, but not limited thereto.
It should be noted that, the design points of the system AP of the present invention when performing encryption coding on the state switch command CMD may include, but are not limited to, the following items:
(1) if the state switching command CMD is added to the non-effective display area, the R/G/B data of a single pixel can be represented by 00-FF, but not limited to this;
(2) if the state switch command CMD is added to the active display area (e.g., status bar), the command list can be customized as desired, for example: if the status bar is darker (lower gray level), the gray level values L0-L16 in the R/G/B data of a single pixel can correspond to the 0-F commands; if the status bar is slightly bright (the gray scale is high), the gray scale values L240-L255 in the R/G/B data of a single pixel can correspond to the commands 0-F, but not limited thereto; and
(3) when the system side AP encrypts and encodes the state switch command CMD, the risk of preventing compression by Vesa transmission is further considered, and therefore, the system side AP may encode the gray level value L0 of the R/G/B data of a single pixel as a binary 0 and encode the gray level value L255 as a binary 1, but not limited thereto.
Next, as shown in fig. 11, fig. 11 is a functional block diagram of the display driving circuit in this embodiment.
As shown in fig. 11, the display driving circuit 1 may be coupled between the system terminal AP and a display unit (e.g., a display panel) PL. The system AP encrypts the command (e.g. the state switching command) in a specific area of the image data and synchronously transmits the encrypted command to the display driving circuit 1, so as to ensure that the display driving circuit 1 can receive the command and the image data at the same time (in the same frame).
The display driving circuit 1 may include a definition unit 10, a determination unit 12, and a control unit 14. The definition unit 10 is used to define the region range of the instruction set in the image in advance. The determining unit 12 is coupled to the defining unit 10 for determining whether the instruction can be executed and the type thereof. The control unit 14 is coupled to the determining unit 12. If the determination result of the determining unit 12 is yes, the control unit 14 recognizes the instruction and executes the instruction to switch the state of the display driving circuit 1 and transmit the image before the display driving circuit 1 transmits the next frame of picture. If the determination result of the determining unit 12 is negative, the control unit 14 maintains the state of the display driving circuit 1 and transmits the image according to the normal flow.
In practical applications, the control unit 14 of the display driving circuit 1 decodes the state switching command from a specific region of the image data to control the subsequent switching timing. Since the display driving circuit 1 can completely grasp the response timing of the state switching command and the image data, the state switching command and the state switching command can be made effective synchronously and output to the display unit (e.g., display panel) for PL display/presentation, thereby achieving the desired display effect.
It should be noted that the specific area of the image data added by the state switching command may correspond to a non-effective display area of the display unit PL, such as at least one of a notch area, a fillet area, a blind hole area, and an under-screen fingerprint identification area, but is not limited thereto; the specific area may also correspond to an effective display area of the display unit, such as at least one data area (1 st to N th) of the status bar, which can avoid a significant display difference and clearly read/recognize the command by designing a command set similar to the color/gray scale data of the status bar, but not limited thereto.
Compared with the prior art, the display driving circuit for synchronizing the image and the instruction provided by the utility model can encrypt the state switching instruction in the specific area of the image data through the system end and synchronously transmit the state switching instruction to the display driving circuit, and then the display driving circuit decodes the state switching instruction from the image data so as to ensure that the display driving circuit can receive the instruction and the image data at the same time (in the same frame), thereby achieving synchronous response of image brushing and switching state, avoiding unexpected display effect caused by asynchronous display image content and display driving circuit state in the process of switching the state of the display driving circuit, and effectively solving the problems in the prior art.
Claims (10)
1. A display driving circuit for synchronizing an image with an instruction, the display driving circuit comprising:
a definition unit for defining the region range of the instruction set in the image in advance;
a determining unit coupled to the defining unit for determining whether the command is enabled and its type; and
and the control unit is coupled with the judging unit, and if the judging result of the judging unit is yes, the control unit identifies the instruction and executes the instruction to switch the state of the display driving circuit and transmit the image before the display driving circuit transmits the next frame of picture.
2. The display driving circuit according to claim 1, wherein if the determination result of the determining unit is negative, the controlling unit maintains the state of the display driving circuit and transmits the image according to a normal flow.
3. The display driving circuit according to claim 1, wherein the display driving circuit is coupled to a system terminal, the command is a state switching command, and the system terminal encrypts the command in a specific area of the image and then synchronously transmits the encrypted command to the display driving circuit.
4. The display driving circuit according to claim 3, wherein when the display driving circuit receives the image, the display driving circuit decodes the command from the specific region of the image to control a subsequent switching timing.
5. The display driver circuit of claim 1, wherein the display driver circuit is coupled to a display unit, and the display unit displays the image in a second state when the display driver circuit switches from a first state to the second state while transmitting the image to the display unit.
6. The display driver circuit of claim 3, wherein the specific region of the image corresponds to a non-active display region of a display cell.
7. The display driver circuit of claim 6, wherein the inactive display area is selected from at least one of a notch area, a fillet area, a blind hole area, and an under-screen fingerprint identification area.
8. A display driver circuit according to claim 3, wherein the specific area of the image corresponds to an effective display area of a display unit.
9. The display driver circuit of claim 1, wherein the active display area is at least one data area of a status bar.
10. The display driving circuit of claim 1, wherein the definition unit further defines the area range as a start/end position of the command set according to the area range defined in advance, and the start area of the command set adopts a specific data format including a header, a first command, a second command, …, and a cyclic redundancy check in sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122142417.XU CN216287522U (en) | 2021-09-07 | 2021-09-07 | Display driving circuit for image and instruction synchronization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122142417.XU CN216287522U (en) | 2021-09-07 | 2021-09-07 | Display driving circuit for image and instruction synchronization |
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| Publication Number | Publication Date |
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| CN216287522U true CN216287522U (en) | 2022-04-12 |
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| CN202122142417.XU Active CN216287522U (en) | 2021-09-07 | 2021-09-07 | Display driving circuit for image and instruction synchronization |
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- 2021-09-07 CN CN202122142417.XU patent/CN216287522U/en active Active
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