CN111540329B - Time schedule controller, control method thereof and display device - Google Patents
Time schedule controller, control method thereof and display device Download PDFInfo
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- CN111540329B CN111540329B CN202010451424.5A CN202010451424A CN111540329B CN 111540329 B CN111540329 B CN 111540329B CN 202010451424 A CN202010451424 A CN 202010451424A CN 111540329 B CN111540329 B CN 111540329B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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Abstract
The invention discloses a control method of a time schedule controller, which comprises the following steps: loading a default white balance lookup table; loading a plurality of preset white balance lookup tables; judging whether the preset white balance lookup tables are loaded completely or not; when the preset white balance lookup tables are not all loaded, carrying out white balance processing on the display panel according to the default white balance lookup table; when all the preset white balance lookup tables are loaded, selecting a specified white balance lookup table from the preset white balance lookup tables to perform white balance processing on the display panel. According to the invention, the default white balance lookup table is used for carrying out white balance processing on the display panel before the preset white balance lookup tables are not completely loaded, so that the starting speed is improved. Meanwhile, after the preset white balance lookup tables are completely loaded, the proper specified white balance lookup tables are switched in real time, so that the output quality of the video picture can be ensured.
Description
Technical Field
The invention relates to the technical field of display, in particular to a time schedule controller, a control method thereof and a display device.
Background
With the development of display technology, Liquid Crystal Display (LCD) devices have excellent characteristics of low voltage, low power consumption, long lifetime, no radiation, thinness, etc., and are unique among flat display devices, becoming a display device which is mature in development, wide in application range, industrialized and still rapidly developed. The time schedule controller is one of the core parts of the liquid crystal panel control system and plays a key role in the normal work of the liquid crystal display system. It receives and processes the output signal of the preceding stage circuit, and generates correct control time sequence to control the normal operation of the liquid crystal panel and the system circuit, and plays the role of 'communicating' the preceding stage circuit and the liquid crystal panel. In the conventional liquid crystal display panel, due to factors such as driving and characteristics of the liquid crystal display panel, displayed white field color coordinates are different to different degrees. For the white field color coordinate difference of the liquid crystal display device, if corresponding white balance adjustment is not performed, the color display effects of different liquid crystal display panels can be greatly different. Therefore, in the production process of the liquid crystal display panel, white balance tracking correction is usually performed, and white balance adjustment is performed on the liquid crystal panels through the white balance lookup table so that the colors displayed by each liquid crystal panel tend to be consistent. The response speed of liquid crystal has been a problem of the liquid crystal panel that needs to be improved due to the liquid crystal characteristics of the liquid crystal panel. In order to improve the display effect of dynamic images and reduce the dynamic smear phenomenon and response time, the liquid crystal panel often adopts an overdrive technique to shorten the liquid crystal rotation time, so that the display images are quickly converted into target images. In order to realize overdrive, an overdrive lookup table needs to be preset, so that an overdrive gray scale can be found from the overdrive lookup table according to a source gray scale and a target gray scale, and then the liquid crystal is driven to turn over by a driving voltage corresponding to the overdrive gray scale, so that the overdrive is realized.
Existing timing controllers typically support a fixed pixel clock frequency, with variations in refresh frequency supported by adjusting the vertical blanking time. When the vertical blanking time of the timing controller is changed, it is necessary to switch setting values of parameters of different overdrive, white balance, or gamma curves. In order to increase the added value of the product, a large number of tables (for example, 10 parts or more) are usually stored, thereby greatly improving the quality of the product. Thus, the time for loading data from the memory is prolonged when correspondingly powered on, thereby resulting in prolonged boot time.
Therefore, how to increase the turn-on speed of the timing controller while ensuring the display quality becomes a key point for those skilled in the art to solve the technical problem urgently and to research all the time.
Disclosure of Invention
In view of this, embodiments of the present invention provide a timing controller, a control method thereof, and a display device, so as to solve the problem in the prior art that the booting speed is slow because the timing controller needs to load a plurality of lookup tables before outputting a video frame to perform overdrive processing on a display panel.
Therefore, the embodiment of the invention provides the following technical scheme:
a first aspect of the present invention provides a method for controlling a timing controller, including:
loading a default white balance lookup table;
loading a plurality of preset white balance lookup tables;
judging whether the preset white balance lookup tables are loaded completely or not;
when the preset white balance lookup tables are not all loaded, carrying out white balance processing on the display panel according to the default white balance lookup table;
and when the preset white balance lookup tables are all loaded, selecting a specified white balance lookup table from the preset white balance lookup tables to carry out white balance processing on the display panel.
Further, the method comprises the following steps:
loading a default overdrive lookup table;
loading a plurality of preset overdrive lookup tables;
judging whether the preset overdrive lookup tables are loaded completely;
when the preset overdrive lookup tables are not loaded completely, overdrive processing is carried out on the display panel according to the default overdrive lookup table;
and when the preset overdrive lookup tables are all loaded, selecting a designated overdrive lookup table from the preset overdrive lookup tables to overdrive the display panel.
Further, before loading the default white balance lookup table or before loading the default overdrive lookup table, the method further includes the following steps:
loading gamma data;
and performing gamma correction on the display panel according to the gamma data.
Further, before determining whether all of the preset white balance lookup tables are loaded, the method further includes the following steps:
loading an optical compensation lookup table;
and performing optical compensation on the display panel according to the optical compensation lookup table.
Further, selecting a specified white balance look-up table from the plurality of preset white balance look-up tables comprises:
acquiring a frame rate of a video source signal;
selecting the designated white balance lookup table according to a frame rate of the video source signal.
Further, acquiring the frame rate of the video source signal comprises:
decompressing the video source signal to obtain a pixel clock signal, and detecting the frequency of the pixel clock signal;
calculating the frame rate according to the frequency of the pixel clock signal and a frame rate calculation formula;
the frame rate calculation formula is as follows:
Frame_rate＝Pixel_Clock_Frequency/(V_total*H_total)；
the Frame _ rate is a Frame rate, the Pixel _ Clock _ Frequency is a Frequency of a Pixel Clock signal, the V _ total is total data scanned in a preset horizontal direction, and the H _ total is total data scanned in a preset vertical direction.
A second aspect of the present invention provides a timing controller comprising: the device comprises a frame rate detection module, a memory module, a flash memory module and a control module;
the frame rate detection module is used for acquiring the frame rate of a video source signal and sending the frame rate to the control module;
the flash memory module is used for storing a default white balance lookup table and a plurality of preset white balance lookup tables;
the memory module is used for loading the default white balance lookup table and the preset white balance lookup tables from the flash memory module;
when the preset white balance lookup tables are not all loaded, the control module is further used for carrying out white balance processing on the display panel according to the default white balance lookup table;
when all the preset white balance lookup tables are loaded, the control module is further configured to select a specific white balance lookup table from the preset white balance lookup tables according to the frame rate of the video source signal to perform white balance processing on the display panel.
Further, the flash memory module is further configured to store a default overdrive lookup table and a plurality of preset overdrive lookup tables;
the memory module is further used for loading the default overdrive lookup table and the preset overdrive lookup tables from the flash memory module;
when the preset overdrive lookup tables are not all loaded, the control module is further used for performing overdrive processing on the display panel according to the default overdrive lookup table;
when all the preset overdrive lookup tables are loaded, the control module is further configured to select a designated overdrive lookup table from the preset overdrive lookup tables according to the frame rate of the video source signal to perform overdrive processing on the display panel.
Further, the acquiring the frame rate of the video source signal by the frame rate detecting module includes:
decompressing the video source signal to obtain a pixel clock signal, and detecting the frequency of the pixel clock signal;
calculating to obtain a frame rate according to the frequency of the pixel clock signal and a frame rate calculation formula;
the frame rate calculation formula is as follows:
Frame_rate＝Pixel_Clock_Frequency/(V_total*H_total)；
the Frame _ rate is a Frame rate, the Pixel _ Clock _ Frequency is a Frequency of a Pixel Clock signal, the V _ total is total data scanned in a preset horizontal direction, and the H _ total is total data scanned in a preset vertical direction.
A third aspect of the invention provides a display device comprising a timing controller according to any one of the embodiments of the second aspect of the invention.
The technical scheme of the embodiment of the invention has the following advantages:
the embodiment of the invention provides a control method of a time schedule controller, and the traditional time schedule controller adopts a white balance lookup table to carry out white balance processing on a display panel, so that the quality of an output video picture is poor. The existing control method of the time schedule controller usually needs to select a proper white balance lookup table to perform white balance processing on the display panel after a plurality of preset white balance lookup tables are completely loaded, so that the output quality of a video picture is improved, but the starting speed is slower. According to the invention, the default white balance lookup table is used for carrying out white balance processing on the display panel before the preset white balance lookup tables are not completely loaded, so that the starting speed is improved. Meanwhile, after the preset white balance lookup tables are completely loaded, the proper specified white balance lookup tables are switched in real time, so that the output quality of the video picture can be ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a control method of a conventional timing controller.
Fig. 2 is a flowchart of a control method of a timing controller according to an embodiment of the invention.
Fig. 3 is a flowchart illustrating a control method of a timing controller according to another embodiment of the present invention.
Fig. 4 is a block diagram of a timing controller according to an embodiment of the present invention.
Detailed Description
The following clearly and completely describes technical solutions of a timing controller, a control method thereof, and a display device in the embodiments of the present application with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for the purpose of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not set forth in detail in order to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
According to an embodiment of the present invention, there is provided an embodiment of a control method of a timing controller, it is noted that the steps illustrated in the flowchart of the drawings may be executed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be executed in an order different from that herein.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The control method of the timing controller provided in this embodiment may be applied to a mobile terminal having a liquid crystal display, such as a mobile phone, a tablet computer, etc., and fig. 1 is a flowchart of a control method of a conventional timing controller. As shown in fig. 1, the control method includes the steps of:
s101: switching on a power supply;
s102: loading data of the single chip microcomputer;
s103: loading gamma data;
s104: loading time sequence control data;
s105: outputting a timing signal according to the timing control data:
s106: acquiring a vertical synchronization signal and outputting a black picture;
s107: loading a plurality of preset white balance lookup tables and/or loading a plurality of preset overdrive lookup tables;
s108: loading an optical compensation lookup table;
s109: acquiring a field synchronization signal;
s110: and outputting the video pictures.
In the prior art, the time required for S101-S104 is usually less than 200 ms. Existing timing controllers typically support a fixed pixel clock frequency, with variations in refresh frequency supported by adjusting the vertical blanking time. When the vertical blanking time of the timing controller is changed, it is necessary to switch setting values of parameters of different overdrive, white balance, or gamma curves. In order to increase the added value of the product, a large number of tables (for example, 10 parts or more) are usually stored, thereby greatly improving the quality of the product. Thus, the time required for the corresponding step S7 is extended, which results in an extended power-on response time.
Fig. 2 is a flowchart of a control method of a timing controller according to an embodiment of the invention. As shown in fig. 2, the present invention provides a method for controlling a timing controller, comprising the steps of:
s201: loading a default white balance lookup table;
s202: loading a plurality of preset white balance lookup tables;
s203: judging whether the preset white balance lookup tables are loaded completely or not;
s204: when the preset white balance lookup tables are not all loaded, carrying out white balance processing on the display panel according to the default white balance lookup table;
s205: when all the preset white balance lookup tables are loaded, selecting a specified white balance lookup table from the preset white balance lookup tables to perform white balance processing on the display panel.
In this embodiment, the control method of the timing controller is used for the liquid crystal display. The default white balance lookup table is loaded first and then a plurality of preset white balance lookup tables are loaded. And before the preset white balance lookup tables are completely loaded, multiplying the default white balance lookup tables by corresponding coefficients to perform white balance processing on the liquid crystal display screen and output a video picture. And after the preset white balance lookup tables are all loaded, selecting a specified white balance lookup table from the preset white balance lookup tables, and replacing the default white balance lookup table by the specified white balance lookup table to multiply the corresponding coefficient to perform white balance processing on the liquid crystal display screen. The plurality of preset white balance lookup tables preferably correspond to different frame rates. After the plurality of preset white balance lookup tables are all loaded, the white balance lookup tables are preferably designated by frame rate selection.
Compared with the prior art, the prior art carries out white balance processing on the display panel and outputs video pictures after a plurality of preset white balance lookup tables are loaded. According to the invention, the default white balance lookup table is used for carrying out white balance processing on the display panel before the preset white balance lookup tables are not completely loaded, so that the starting response time of the time schedule controller is greatly shortened. After the preset white balance lookup tables are completely loaded, the proper appointed white balance table is switched in real time, so that the output quality of the video picture can be ensured.
In one embodiment, a default overdrive lookup table is loaded. And loading a plurality of preset overdrive lookup tables. Judging whether all the preset overdrive lookup tables are loaded or not; and when the preset overdrive lookup tables are not loaded completely, performing overdrive processing on the display panel according to the default overdrive lookup table. And when the plurality of preset overdrive lookup tables are all loaded, selecting a specified overdrive lookup table from the plurality of preset overdrive lookup tables to perform overdrive processing on the display panel.
In this embodiment, the control method of the timing controller is used for the liquid crystal display. The default overdrive lookup table is loaded first and then a plurality of preset overdrive lookup tables are loaded. And before the preset overdrive lookup tables are completely loaded, the default overdrive lookup table is multiplied by a corresponding coefficient to perform overdrive processing on the liquid crystal display screen and output a video picture. And after the plurality of preset overdrive lookup tables are all loaded, selecting a specified overdrive lookup table from the plurality of preset overdrive lookup tables, and replacing the default overdrive lookup table by the specified overdrive lookup table to multiply the corresponding coefficient to perform overdrive processing on the liquid crystal display screen. The plurality of preset overdrive lookup tables preferably correspond to different frame rates. After the plurality of preset overdrive lookup tables are all loaded, the overdrive lookup tables are preferably designated by frame rate selection.
Compared with the prior art, the display panel is overdriven by using the default overdrive lookup table before the preset overdrive lookup tables are not completely loaded, so that the starting response time of the time schedule controller is greatly shortened. After the preset overdrive lookup tables are completely loaded, the proper appointed overdrive tables are switched in real time, so that the output quality of video pictures can be ensured.
In one embodiment, before loading the default white balance lookup table or before loading the default overdrive lookup table, the method further includes the following steps: the gamma data is loaded. The display panel is gamma corrected based on the gamma data.
In this embodiment, the gamma data includes gamma curve parameters. The gamma data preferably includes a plurality of gamma data units. Each gamma data unit corresponds to a display mode. And selecting a designated gamma data unit according to the display mode, and performing voltage correction on the display panel according to the designated gamma data unit.
In one embodiment, before determining whether all of the preset white balance lookup tables are loaded, the method further includes the following steps: an optical compensation look-up table is loaded. And performing optical compensation on the display panel according to the optical compensation lookup table.
In this embodiment, the optical compensation lookup table can be selected as gray scale or three color. The optical compensation lookup table is used for carrying out optical compensation on the display panel according to the brightness and chromaticity deviation conditions of different areas of the display panel, so that the conditions of uneven chromaticity, abnormal brightness and the like of the display panel can be eliminated.
In one embodiment, selecting the specific white balance lookup table from the plurality of preset white balance lookup tables includes: the frame rate of the video source signal is obtained. The designated white balance look-up table is selected according to the frame rate of the video source signal.
In this embodiment, the display effect of the display panel can be ensured by automatically adjusting the white balance data table according to the frame rate change of the video source signal.
In one embodiment, obtaining the frame rate of the video source signal comprises: the pixel clock signal is decompressed from the video source signal and the frequency of the pixel clock signal is detected. And calculating the frame rate according to the frequency of the pixel clock signal and a frame rate calculation formula. The frame rate calculation formula is:
Frame_rate＝Pixel_Clock_Frequency/(V_total*H_total)；
the Frame _ rate is a Frame rate, the Pixel _ Clock _ Frequency is a Frequency of a Pixel Clock signal, the V _ total is total data scanned in a preset horizontal direction, and the H _ total is total data scanned in a preset vertical direction. And calculating the high-level duration of the pixel clock signal according to the number of the sampling clock signals of the high level of the pixel clock signal. And calculating the frame rate of the video source signal according to the high level duration of the pixel clock signal.
In this embodiment, detecting the frequency of the pixel clock signal includes: firstly, generating a sampling clock signal, acquiring the high level of the pixel clock signal through the sampling clock signal, and counting the number of the sampling clock signals of the high level of the pixel clock signal.
Fig. 3 is a flowchart illustrating a control method of a timing controller according to another embodiment of the present invention. As shown in fig. 3, the control method includes the steps of:
s301: switching on a power supply;
s302: loading data of the single chip microcomputer;
s303: loading gamma data;
s304: loading time sequence control data;
s305: outputting a timing signal according to the timing control data:
s306: acquiring a vertical synchronization signal and outputting a black picture;
s307: loading a default white balance lookup table and a default overdrive lookup table;
s308: loading an optical compensation lookup table;
s309: loading a plurality of preset white balance lookup tables and a plurality of preset overdrive lookup tables;
s310: acquiring a field synchronization signal;
s311: judging whether the preset white balance lookup tables and the preset overdrive lookup tables are loaded completely or not;
s312: and S311, if the judgment result is negative, performing white balance processing on the display panel according to the default white balance lookup table, and performing overdrive processing on the display panel according to the default overdrive lookup table.
S313: if the judgment result in S311 is yes, a designated white balance lookup table is selected from the plurality of preset white balance lookup tables to perform white balance processing on the display panel, and a designated overdrive lookup table is selected from the plurality of preset overdrive lookup tables to perform overdrive processing on the display panel.
S314: and outputting the video pictures.
In this embodiment, the gamma data includes gamma curve parameters. The gamma data preferably includes a plurality of gamma data units. Each gamma data unit corresponds to a display mode. It is preferable that the designated gamma data unit is selected according to the display mode, and the voltage correction is performed on the display panel according to the designated gamma data unit. The optical compensation lookup table can be selected to be gray scale or three color. The optical compensation lookup table is used for carrying out optical compensation on the display panel according to the brightness and chromaticity deviation conditions of different areas of the display panel, so that the conditions of uneven chromaticity, abnormal brightness and the like of the display panel can be eliminated. After the plurality of preset white balance lookup tables and the plurality of preset overdrive lookup tables are all loaded, the designated white balance lookup table and the designated overdrive lookup table are preferably selected by the frame rate.
Compared with the prior art, the display panel is subjected to white balance processing by the default white balance lookup table before the preset white balance lookup tables are completely loaded, and is subjected to overdrive processing by the default overdrive lookup table, so that the starting speed is increased. Meanwhile, after the preset white balance lookup tables and the preset overdrive lookup tables are completely loaded, the proper designated white balance lookup table and the proper overdrive lookup table are switched in real time, so that the output quality of the video picture can be ensured.
Fig. 4 is a block diagram of a timing controller according to an embodiment of the present invention. As shown in fig. 4, the present invention provides a timing controller, including: a frame rate detection module 401, a memory module 403, a flash memory module 402 and a control module 404. The frame rate detecting module 401 is configured to obtain a frame rate of a video source signal and send the frame rate to the control module 404. The flash memory module 402 is used for storing a default white balance lookup table and a plurality of preset white balance lookup tables. The memory module 403 is configured to load a default white balance lookup table and a plurality of preset white balance lookup tables from the flash memory module 402. When the preset white balance lookup tables are not all loaded, the control module 404 is further configured to perform white balance processing on the display panel according to the default white balance lookup table. When all of the preset white balance lookup tables are loaded, the control module 404 is further configured to select a specific white balance lookup table from the preset white balance lookup tables according to the frame rate of the video source signal to perform white balance processing on the display panel.
In this embodiment, the timing controller is used for the liquid crystal display. The control module 404 is also configured to send timing signals to the power management integrated circuit 405. The memory module 403 loads the default white balance lookup table first and then loads a plurality of preset white balance lookup tables. Before the preset white balance lookup tables are completely loaded, the control module 404 multiplies the default white balance lookup table by the corresponding coefficient to perform white balance processing on the liquid crystal display screen and output a video picture. After the preset white balance lookup tables are all loaded, the control module 404 selects a designated white balance lookup table from the preset white balance lookup tables, and replaces the default white balance lookup table with the designated white balance lookup table to multiply the corresponding coefficient to perform white balance processing on the liquid crystal display screen. The plurality of preset white balance lookup tables preferably correspond to different frame rates. After the plurality of preset white balance lookup tables are all loaded, the control module 404 preferably selects a designated white balance lookup table by the frame rate.
Compared with the prior art, the display panel is subjected to white balance processing by the default white balance lookup table before the preset white balance lookup tables are not completely loaded, so that the starting response time of the time schedule controller is greatly shortened. After the preset white balance lookup tables are completely loaded, the proper appointed white balance table is switched in real time, so that the output quality of the video picture can be ensured.
In one embodiment, the flash memory module 402 is further configured to store a default overdrive lookup table and a plurality of preset overdrive lookup tables. The memory module 403 is configured to load a default overdrive lookup table and a plurality of preset overdrive lookup tables from the flash memory module 402. When the preset overdrive lookup tables are not all loaded, the control module 404 is further configured to perform overdrive processing on the display panel according to the default overdrive lookup table. When all of the preset overdrive lookup tables are loaded, the control module 404 is further configured to select a specific overdrive lookup table from the preset overdrive lookup tables according to the frame rate of the video source signal to perform overdrive processing on the display panel.
Compared with the prior art, the display panel is overdriven by using the default overdrive lookup table before the preset overdrive lookup tables are not completely loaded, so that the starting response time of the time schedule controller is greatly shortened. After the preset overdrive lookup tables are completely loaded, the proper appointed overdrive tables are switched in real time, so that the output quality of video pictures can be ensured.
In one embodiment, the frame rate detecting module 401 obtains the frame rate of the video source signal and includes: the pixel clock signal is decompressed from the video source signal and the frequency of the pixel clock signal is detected. And calculating the frame rate according to the frequency of the pixel clock signal and a frame rate calculation formula. The frame rate is calculated as:
Frame_rate＝Pixel_Clock_Frequency/(V_total*H_total)；
the Frame _ rate is a Frame rate, the Pixel _ Clock _ Frequency is a Frequency of a Pixel Clock signal, the V _ total is total data scanned in a preset horizontal direction, and the H _ total is total data scanned in a preset vertical direction.
In this embodiment, detecting the frequency of the pixel clock signal includes: firstly, generating a sampling clock signal, acquiring the high level of the pixel clock signal through the sampling clock signal, and counting the number of the sampling clock signals of the high level of the pixel clock signal.
The invention also provides a display device which comprises the time schedule controller of any one of the embodiments.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. A control method of a time schedule controller is characterized by comprising the following steps:
loading a default white balance lookup table;
loading a plurality of preset white balance lookup tables;
judging whether the preset white balance lookup tables are loaded completely or not;
when the preset white balance lookup tables are not all loaded, carrying out white balance processing on the display panel according to the default white balance lookup table;
when the preset white balance lookup tables are all loaded, selecting a specified white balance lookup table from the preset white balance lookup tables to perform white balance processing on the display panel;
the control method of the time schedule controller further comprises the following steps:
loading a default overdrive lookup table;
loading a plurality of preset overdrive lookup tables;
judging whether the preset overdrive lookup tables are loaded completely;
when the preset overdrive lookup tables are not loaded completely, overdrive processing is carried out on the display panel according to the default overdrive lookup table;
and when the preset overdrive lookup tables are all loaded, selecting a designated overdrive lookup table from the preset overdrive lookup tables to overdrive the display panel.
2. The method of claim 1, wherein before loading the default white balance lookup table or before loading the default overdrive lookup table, the method further comprises:
loading gamma data;
and performing gamma correction on the display panel according to the gamma data.
3. The method of claim 1, wherein before determining whether all of the preset white balance lookup tables are loaded, the method further comprises:
loading an optical compensation lookup table;
and performing optical compensation on the display panel according to the optical compensation lookup table.
4. The method of claim 1, wherein selecting the designated white balance lookup table from the plurality of preset white balance lookup tables comprises:
acquiring a frame rate of a video source signal;
selecting the designated white balance lookup table according to a frame rate of the video source signal.
5. The method of claim 4, wherein the obtaining the frame rate of the video source signal comprises:
decompressing the video source signal to obtain a pixel clock signal, and detecting the frequency of the pixel clock signal;
calculating the frame rate according to the frequency of the pixel clock signal and a frame rate calculation formula;
the frame rate calculation formula is as follows:
Frame_rate＝Pixel_Clock_Frequency/(V_total*H_total)；
the Frame _ rate is a Frame rate, the Pixel _ Clock _ Frequency is a Frequency of a Pixel Clock signal, the V _ total is total data scanned in a preset horizontal direction, and the H _ total is total data scanned in a preset vertical direction.
6. A timing controller, comprising: the device comprises a frame rate detection module, a memory module, a flash memory module and a control module;
the frame rate detection module is used for acquiring the frame rate of a video source signal and sending the frame rate to the control module; the flash memory module is used for storing a default white balance lookup table and a plurality of preset white balance lookup tables;
the memory module is used for loading the default white balance lookup table and the preset white balance lookup tables from the flash memory module;
when the preset white balance lookup tables are not all loaded, the control module is further used for carrying out white balance processing on the display panel according to the default white balance lookup table;
when the preset white balance lookup tables are all loaded, the control module is further configured to select a specified white balance lookup table from the preset white balance lookup tables according to the frame rate of the video source signal to perform white balance processing on the display panel;
the flash memory module is also used for storing a default overdrive lookup table and a plurality of preset overdrive lookup tables;
the memory module is further used for loading the default overdrive lookup table and the preset overdrive lookup tables from the flash memory module;
when the preset overdrive lookup tables are not all loaded, the control module is further used for performing overdrive processing on the display panel according to the default overdrive lookup table;
when all the preset overdrive lookup tables are loaded, the control module is further configured to select a designated overdrive lookup table from the preset overdrive lookup tables according to the frame rate of the video source signal to perform overdrive processing on the display panel.
7. The timing controller of claim 6, wherein the frame rate detecting module obtains a frame rate of a video source signal comprises:
decompressing the video source signal to obtain a pixel clock signal, and detecting the frequency of the pixel clock signal;
calculating to obtain a frame rate according to the frequency of the pixel clock signal and a frame rate calculation formula;
the frame rate calculation formula is as follows:
Frame_rate＝Pixel_Clock_Frequency/(V_total*H_total)；
the Frame _ rate is a Frame rate, the Pixel _ Clock _ Frequency is a Frequency of a Pixel Clock signal, the V _ total is total data scanned in a preset horizontal direction, and the H _ total is total data scanned in a preset vertical direction.
8. A display device comprising the timing controller according to any one of claims 6 to 7.
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| CN113674664B (en) * | 2021-08-05 | 2023-08-01 | Tcl华星光电技术有限公司 | White balance adjusting method of display device and display device |
| CN113823237B (en) * | 2021-09-16 | 2022-09-27 | 惠州华星光电显示有限公司 | Display device and driving method thereof |
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