CN116312317A - Display device and resolution switching method thereof - Google Patents
Display device and resolution switching method thereof Download PDFInfo
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- CN116312317A CN116312317A CN202310017460.4A CN202310017460A CN116312317A CN 116312317 A CN116312317 A CN 116312317A CN 202310017460 A CN202310017460 A CN 202310017460A CN 116312317 A CN116312317 A CN 116312317A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2340/00—Aspects of display data processing
- G09G2340/04—Changes in size, position or resolution of an image
- G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
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Abstract
The invention discloses a display device and a resolution switching method of the display device, wherein the resolution switching method of the display device comprises the following steps: preprocessing an image frame of a first resolution in an application processor to obtain a dummy image frame of a predetermined vertical resolution; setting a horizontal synchronization signal according to the predetermined vertical resolution in a display driving chip; and scaling, in the display driving chip, the effective pixel data in the dummy image frame to obtain an image frame of a second resolution, wherein the second resolution is higher than the first resolution. So that the display time sequence when switching the image frame resolution is consistent with the display time sequence of the display panel, and no display abnormality is generated at the switching moment.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device and a resolution switching method thereof.
Background
Along with the continuous development of display technology, the display resolution is higher and higher, and the bandwidth required by the display module to process the picture is higher and higher, so that a display driving scaling algorithm (scaling algorithm) is required to process the picture, and further the bandwidth requirement of the display module is met.
Meanwhile, in terms of a scaling algorithm for image display driving, since the resolution of an image frame does not necessarily completely coincide with the resolution of an image that can be displayed by a display module, the display module often needs to perform necessary scaling processing on the image frame through the scaling algorithm, so that the processed image frame can meet the requirement of the display module on the image resolution, and a user can appreciate a clear picture.
When the resolution of the image frames is switched, different image frames need to be initially processed, so that abnormal display is caused at the moment of switching the resolution of the image frames, and a black picture is generally displayed for shielding.
Disclosure of Invention
In view of the foregoing, it is an object of the present invention to provide a display device and a resolution switching method thereof, so as to solve the technical drawbacks in the prior art.
According to an aspect of the present invention, there is provided a resolution switching method of a display device, including:
preprocessing an image frame of a first resolution in an application processor to obtain a dummy image frame of a predetermined vertical resolution;
setting a horizontal synchronization signal according to the predetermined vertical resolution in a display driving chip; and
in the display driver chip, scaling the effective pixel data in the dummy image frame to obtain an image frame of a second resolution,
wherein the second resolution is higher than the first resolution.
Preferably, the predetermined vertical resolution corresponds to a physical vertical resolution of a display panel in the display device.
Preferably, the preprocessing includes filling dummy pixel rows in the image frame to improve vertical resolution.
Preferably, the filling comprises appending the dummy pixel row before or after the active pixel row.
Preferably, the values of the pixels in the dummy pixel row are fixed values.
Preferably, the number of lines of the dummy pixel line is equal to a difference between the predetermined vertical resolution and the number of lines of the effective pixel line.
Preferably, the scaling includes interpolating valid pixel data in the dummy image frames to obtain image frames of a second resolution.
Preferably, the interpolation method includes a bilinear interpolation algorithm or a nearest neighbor interpolation algorithm.
Preferably, the scaling further comprises: and calculating a scaling factor according to the second resolution and the vertical resolution in the first resolution.
According to another aspect of the present invention, there is provided a display device including:
an application processor comprising a graphics processor, wherein the graphics processor is configured to perform graphics processing to generate image frames;
the display driving chip is connected with the application processor to receive the image frame and generate a display driving signal according to the image frame; and
a display panel connected with the display driving chip and displaying image according to the display driving signal,
the application processor preprocesses the image frames with the first resolution to obtain false image frames with the preset vertical resolution, the display driving chip sets a horizontal synchronous signal according to the preset vertical resolution, and the display driving chip scales effective data in the false image frames to obtain image frames with the second resolution, wherein the second resolution is higher than the first resolution.
Preferably, the display driving chip is any one of an LCD display driving chip, an OLED display driving chip and a touch display driving chip.
The invention provides a display device and a resolution switching method thereof. When the resolution ratio in the image frame data stream provided by the application processor is suddenly switched, the display time sequence in the image frames with two resolutions comprises the same number of horizontal synchronizing signals after preprocessing, and the display time sequence after the scaling processing of the display driving circuit still drives the display panel by the number of horizontal synchronizing signals, so that the time sequence can still be kept unchanged when the resolution ratio in the image frame data stream provided by the application processor is switched.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a block diagram of a display device provided according to an embodiment of the present invention;
FIG. 2a shows an exemplary diagram of a different resolution zoom display scheme for a display panel according to the prior art;
FIG. 2b shows a display timing map of an image frame and a display panel at various resolutions according to the prior art;
FIG. 3 shows a flow chart of a resolution switching method provided according to an embodiment of the invention;
FIG. 4a is a flowchart of an image frame specific processing method according to an embodiment of the present invention;
FIG. 4b illustrates a display timing diagram of an image frame and a display panel at various resolutions provided in accordance with an exemplary embodiment of the present invention;
FIG. 5a is a flowchart of a specific processing method of a scaling procedure according to an embodiment of the present invention;
fig. 5b shows a timing transition diagram before and after switching resolutions according to an exemplary embodiment of the present invention;
FIG. 6 illustrates an exemplary diagram of a different resolution zoom display scheme provided in accordance with an exemplary embodiment of the present invention;
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. The same elements or modules are denoted by the same or similar reference numerals in the various figures. For clarity, the various features of the drawings are not drawn to scale.
It should be appreciated that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and/or elements capable of storing instructions for execution by the programmable circuits. When an element or circuit is referred to as being "connected to" another element or circuit is "connected between" two nodes, it can be directly coupled or connected to the other element or intervening elements may be present, the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, it means that there are no intervening elements present between the two.
Also, certain terms are used throughout the description and claims to refer to particular components. It will be appreciated by those of ordinary skill in the art that a hardware manufacturer may refer to the same component by different names. The present patent specification and claims do not take the form of an element or components as a functional element or components as a rule.
Furthermore, it should be noted that relational terms such as first and second are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Fig. 1 shows a block diagram of a display device provided according to an embodiment of the present invention;
referring to fig. 1, fig. 1 is a block diagram of a display device provided in the present application, and the display device provided in an embodiment of the present disclosure includes: an application processor 10, a display driver chip 20, and a display panel 30, wherein,
the application processor 10 includes: a graphics processor 11, a graphics random access memory 12, wherein the graphics random access memory 12 is communicatively connected with a Codec Overlay hardware (GPU Codec OVL (Overlay hardware)) of the graphics processor 11, and is configured to receive and store an image frame output by the graphics processor 11; the ram 12 is further communicatively connected to the display serial interface, and is configured to output the stored image frames to the display driver chip 20 through the display serial interface;
the display panel 30 includes a plurality of scan lines extending in a row direction for applying a scan signal, a plurality of data lines extending in a column direction, and a plurality of pixels PX arranged in a matrix form and connected to the scan lines and the data lines.
The display driving chip 20 controls the display panel 10 to display the received image frame.
FIG. 2a shows an exemplary diagram of a different resolution zoom display scheme for a display panel according to the prior art; fig. 2b shows a display timing map of an image frame and a display panel at various resolutions according to the prior art.
In the prior art, the application processor provides two resolution image frame data streams, 800 x 600 and 1200 x 900, respectively, where 800 and 1200 represent the number of columns of pixels in an image and 600 and 900 represent the number of rows of pixels in an image.
The display panel is displayed after the scaling treatment, and when the resolution is switched, the display timing sequence of progressive scanning is different when the resolution is switched to the physical resolution of the display panel due to different vertical resolutions, so that the display panel is abnormal in display, and black pictures are displayed to be shielded in the prior art.
As shown in fig. 2b, the application processor provides display timing signals with resolution of 800×600 and 1200×900 image frames and display timing signals with resolution of 1600×1200 physical resolution of the display panel, each of the display timing signals includes a plurality of vertical synchronization signals Vsync (not shown) for indicating the end of transmission of one frame of pixel data, and each time the transmission is completed, the vertical synchronization signals Vsync jump in level; in the display frame, a plurality of horizontal synchronizing signals (denoted by H in the drawing) are also included, and one horizontal synchronizing signal interval is used for representing the transmission of display data of one line of pixel data.
When the display timing of a frame period is displayed with a resolution of 800×600 and the display timing of a frame period is displayed with a resolution of 1200×900 is displayed with 900 horizontal synchronizing signals, the display timing is different when the two resolution image frames are displayed on the display panel with a resolution of 1600×1200 by a scaling algorithm, and the number of horizontal synchronizing signals needs to be reset by the display driving chip, so that the display timing is different at the moment of switching the two resolution image frame data streams, which results in abnormal display of the display panel.
FIG. 3 shows a flow chart of a resolution switching method provided according to an embodiment of the invention;
the resolution switching method is implemented by the display device shown in fig. 1, for example, and specifically includes:
in step S11, the image frames of the first resolution are preprocessed to obtain dummy image frames of a predetermined vertical resolution.
In this step, the application processor pre-processes the image frames provided at the original resolution, specifically by pre-processing the image frames to dummy image frames of a predetermined vertical resolution.
Also taking the display time sequence when the application processor provides the image frames with the original resolutions of 800×600 and 1200×900 and the display time sequence when the resolution is 1600×1200 of the physical resolution of the display panel as an example, the display time sequences all comprise a plurality of vertical synchronization signals Vsync (not shown in the figure) for indicating the transmission end of one frame of pixel data, and each time the transmission is completed, the level of the vertical synchronization signals Vsync jumps; in the display frame, a plurality of horizontal synchronizing signals (denoted by H in the drawing) are also included, and one horizontal synchronizing signal interval is used for representing the transmission of display data of one line of pixel data.
600 horizontal synchronizing signals are included in a display timing sequence with an original resolution of 800×600 in a period of displaying one frame, and 900 horizontal synchronizing signals are included in a display timing sequence with an original resolution of 1200×900
FIG. 4a is a flowchart of an image frame specific processing method according to an embodiment of the present invention; FIG. 4b illustrates a display timing diagram of an image frame and a display panel at various resolutions provided in accordance with an exemplary embodiment of the present invention;
as seen in connection with fig. 4a and 4b, step S11 may specifically include:
s21: and calculating the line number of the data of the filling dummy pixel line according to the preset vertical resolution and the vertical resolution in the first resolution.
Illustratively, the number of lines filling the dummy pixel lines is calculated by comparing a predetermined vertical resolution, which in this embodiment is greater than the original resolution of the image frame provided by the application processor before and after the display device switches resolutions, with the vertical resolution in the original resolution of the image frame provided by the application processor.
When the original resolution of the image frame provided by the application processor is 800×600 and the predetermined vertical resolution is 1200, the number of lines of the dummy pixel line data to be filled is 1200-600, namely 600 lines of the dummy pixel line; when the original resolution of the image frame provided by the application processor is 1200×900, the number of lines required to be filled with the dummy pixel line data is 1200-900, that is, 300 lines of dummy pixel lines, and the above predetermined vertical resolution can be modified according to the actual situation, which is not limited in this application.
Thus, the number of lines filling the dummy pixel lines is equal to the difference between the predetermined vertical resolution and the vertical resolution in the original resolution of the image frame provided by the application processor. In a preferred embodiment, the predetermined vertical resolution is a physical vertical resolution of the display panel.
In one embodiment, the data of the pixels in the dummy pixel rows are fixed values, so that the effective pixel rows and the dummy pixel rows can be distinguished after the subsequent display driving chip accepts the dummy image frame.
S22: dummy pixel rows are filled in the image frame.
For example, for the filled dummy pixel line, the dummy pixel line is inserted into the original image frame provided by the application processor, and the dummy pixel line is used as a space, and has no function of actually providing display data, so that the dummy pixel line is called invalid data, the original data in the image frame provided by the application processor is called valid data, the original pixel line is called valid pixel line (the line number thereof corresponds to the vertical resolution in the original resolution of the image frame), and the dummy pixel line can be filled before or after the valid pixel line in the image frame, and can be adjusted according to the actual situation, which is not limited in the application.
After filling the dummy pixel rows, the application processor sends the dummy image frames including the dummy pixel rows to the display driver chip and further processing is performed by the display driver chip.
In one embodiment, the data of the pixels in the dummy pixel rows are fixed values, so that the effective pixel rows and the dummy pixel rows can be distinguished after the subsequent display driving chip accepts the dummy image frame.
In step S12, a horizontal synchronization signal is set according to the predetermined vertical resolution.
In this step, after the display driving chip receives the dummy image frame, a horizontal synchronization signal is set according to the vertical resolution in the dummy image frame, that is, a horizontal synchronization signal is set for the number of pixel rows included in the dummy image frame, and the dummy image frame includes a set of effective pixel rows and dummy pixel rows.
In step S13, the valid data in the dummy image frames is scaled to obtain image frames of a second resolution.
FIG. 5a is a flowchart of a specific processing method of a scaling procedure according to an embodiment of the present invention; fig. 5b shows a timing transition diagram before and after switching resolutions according to an exemplary embodiment of the present invention;
in this step, the display driving chip scales the effective data in the dummy image frame, and as seen in fig. 5a and 5b, step S13 may specifically include:
s31: a scaling factor is calculated from the predetermined vertical resolution and the vertical resolution in the first resolution.
Illustratively, the scaling factor is calculated by comparing the predetermined vertical resolution with the vertical resolution in the original resolution of the image frame provided by the application processor.
When the original resolution of the image frame provided by the application processor is 800 multiplied by 600, and when the preset vertical resolution is 1200, the scaling factor is 2; when the original resolution of the image frame provided by the application processor is 1200×900, the scaling factor is 1.33.
S32: effective pixel data in the dummy image frames is interpolated to obtain image frames of a second resolution.
In this step, the display driving chip performs interpolation processing on the effective pixel data in the above-mentioned pseudo image frame to obtain an image frame adapting to the physical resolution of the display panel, where, for example, the original resolution of the image frame is 800×600, and when the display resolution of the display panel is 1600×1200, 800×600 pixels are extended to adjacent pixels to display by nearest neighbor interpolation or bilinear interpolation, so as to fill the whole picture with 1600×1200, and after scaling processing by the display driving circuit, the number of pixels in each column is correspondingly extended from 600 to 1200, and the number of pixels in each row is also correspondingly changed. When the original resolution of the image frame is 800×600 and the display resolution of the display panel is 1600×1200, the number of pixels in each column is increased from 900 to 1200, and the number of pixels in each row is also changed in a corresponding proportion.
As shown in fig. 5b, when the resolution in the image frames provided by the application processor is suddenly switched, the number of pixel rows of both image frames is 1200 rows, which is consistent with the number of scanning rows driving the display panel with a resolution of 1600×1200 (this is the preferred embodiment, and may be different in other cases), i.e. corresponding to 1200 horizontal synchronization signals, so that the display timing is still kept unchanged even when the resolution in the image frame data stream provided by the application processor is switched.
FIG. 6 illustrates an exemplary diagram of a different resolution zoom display scheme provided in accordance with an exemplary embodiment of the present invention;
as shown in fig. 6, after the resolution switching method provided by the present application is utilized, the original image frame with the resolution of 800×600 is converted into the dummy image frame with the resolution of 800×1200 through preprocessing, and the original image frame with the resolution of 1200×900 is converted into the dummy image frame with the resolution of 1200×1200, and when the dummy image frames with the two resolutions are displayed in the display panel with the resolution of 1600×1200 through a scaling algorithm, the time sequence is not required to be changed, so that the display panel can normally display at the moment of switching the image frame data streams with the two resolutions.
In addition, the display device provided by the invention is used for executing the resolution switching method, and comprises the following steps: an application processor comprising a graphics processor, wherein the graphics processor is configured to perform graphics processing to generate image frames; the display driving chip is connected with the application processor to receive the image frame and generate a display driving signal according to the image frame; and a display panel connected with the display driving chip and displaying an image frame according to the display driving signal, wherein the application processor pre-processes the image frame of a first resolution to obtain a dummy image frame of a predetermined vertical resolution, the display driving chip sets a horizontal synchronization signal according to the predetermined vertical resolution, and the display driving chip scales effective data in the dummy image frame to obtain an image frame of a second resolution, the second resolution being higher than the first resolution, the predetermined vertical resolution being identical to a physical vertical resolution of a display panel in the display device.
The display device in the application can be applied to a display device in which the display driving chip is any one of an LCD display driving chip, an OLED display driving chip and a touch display driving chip. The display panel may be designed as a full screen, a curved screen, a special-shaped screen, a double-sided screen, or a folded screen, which is not limited in this embodiment. In one possible implementation, the display panel also has a touch function by which a user can perform a touch operation on the display screen module using any suitable object such as a finger, a stylus, or the like.
It should be noted that the words "during", "when" and "when … …" as used herein in relation to circuit operation are not strict terms indicating an action that occurs immediately upon the start of a start-up action, but rather there may be some small but reasonable delay or delays between it and the reaction action (reaction) initiated by the start-up action, such as various transmission delays and the like, as will be appreciated by those of ordinary skill in the art. The word "about" or "substantially" is used herein to mean that an element value (element) has a parameter that is expected to be close to the stated value or position. However, as is well known in the art, there is always a slight deviation such that the value or position is difficult to strictly assume the stated value. It has been well established in the art that deviations of at least ten percent (10%) (at least twenty percent (20%)) for semiconductor doping concentrations are reasonable deviations from the exact ideal targets described. When used in connection with a signal state, the actual voltage value or logic state of the signal (e.g., "1" or "0") depends on whether positive or negative logic is used.
Embodiments in accordance with the present invention, as described above, are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various modifications as are suited to the particular use contemplated. The scope of the invention should be determined by the appended claims and their equivalents.
Claims (11)
1. A resolution switching method of a display device, comprising:
preprocessing an image frame of a first resolution in an application processor to obtain a dummy image frame of a predetermined vertical resolution;
setting a horizontal synchronization signal according to the predetermined vertical resolution in a display driving chip; and
in the display driver chip, scaling the effective pixel data in the dummy image frame to obtain an image frame of a second resolution,
wherein the second resolution is higher than the first resolution.
2. The resolution switching method according to claim 1, wherein the predetermined vertical resolution coincides with a physical vertical resolution of a display panel in the display device.
3. The resolution switching method according to claim 1, wherein the preprocessing includes filling dummy pixel rows in the image frame of the first resolution to improve vertical resolution.
4. A resolution switching method according to claim 3, wherein the filling comprises appending the dummy pixel row before or after an active pixel row.
5. A resolution switching method according to claim 3, wherein the value of a pixel in the dummy pixel row is a fixed value.
6. The resolution switching method according to claim 4, wherein a number of lines of the dummy pixel line is equal to a difference between the predetermined vertical resolution and a number of lines of the effective pixel line.
7. The resolution switching method of claim 1, wherein the scaling includes interpolating valid pixel data in the dummy image frames to obtain image frames of a second resolution.
8. The resolution switching method according to claim 7, wherein the interpolation method includes a bilinear interpolation algorithm or a nearest neighbor interpolation algorithm.
9. The resolution switching method of claim 7, wherein the scaling further comprises: a scaling factor is calculated from the predetermined vertical resolution and the vertical resolution in the first resolution.
10. A display device, comprising:
an application processor comprising a graphics processor, wherein the graphics processor is configured to perform graphics processing to generate image frames;
the display driving chip is connected with the application processor to receive the image frame and generate a display driving signal according to the image frame; and
a display panel connected with the display driving chip and displaying image according to the display driving signal,
the application processor preprocesses the image frames with the first resolution to obtain false image frames with the preset vertical resolution, the display driving chip sets a horizontal synchronous signal according to the preset vertical resolution, and the display driving chip scales effective data in the false image frames to obtain image frames with the second resolution, wherein the second resolution is higher than the first resolution.
11. The display device of claim 10, wherein the display driver chip is any one of an LCD display driver chip, an OLED display driver chip, and a touch display driver chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310017460.4A CN116312317A (en) | 2023-01-06 | 2023-01-06 | Display device and resolution switching method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310017460.4A CN116312317A (en) | 2023-01-06 | 2023-01-06 | Display device and resolution switching method thereof |
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| CN116312317A true CN116312317A (en) | 2023-06-23 |
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| CN202310017460.4A Pending CN116312317A (en) | 2023-01-06 | 2023-01-06 | Display device and resolution switching method thereof |
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