Display driving system and method and display device

Abstract

The invention discloses a display driving method and system and a display device, the display device comprises a display module and a backlight module, and the display driving method comprises the steps of decoding a video source signal and then outputting display data; after the display data is subjected to overdrive processing, a display control signal is output, and the display module is controlled to work according to the display control signal; and after the display data is subjected to over-drive processing, a backlight control signal is output, and the backlight module is controlled to work according to the backlight control signal. The problem that the instantaneous brightness and contrast ratio of the picture are reduced due to the fact that the current display picture has a trailing phenomenon and the light transmittance of the liquid crystal in the torsion process is in an intermediate state can be relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronics, in particular to a display driving system, method and display device. BACKGROUND

[0002] Liquid crystal display devices are widely used in terminal devices such as televisions and monitors due to their advantages of thinness, low power consumption, etc. However, the response time of liquid crystal molecules under the action of an electric field is relatively long, which leads to a trailing problem in the display of dynamic pictures, affecting the viewing experience.

[0003] Specifically, the twisting of liquid crystal molecules needs a certain time to complete. After the excitation signal is applied, the liquid crystal cannot instantly reach the target deflection state, resulting in that the transmittance cannot immediately match the target brightness. When displaying a moving picture, the residual image of the previous frame is superimposed on the current frame, causing a decrease in dynamic clarity, especially in fast-moving scenes, the picture details are blurred and accompanied by a trailing phenomenon. In addition, the transmittance of liquid crystal in the twisting process is in an intermediate state, rather than the maximum brightness corresponding to the driving voltage, further reducing the instantaneous brightness and contrast of the picture.

[0004] Therefore, the current technology still needs to be improved and enhanced. SUMMARY

[0005] The present application provides a display driving method, system and display device, which can alleviate the problems of the current display picture having a trailing phenomenon and the transmittance of liquid crystal in the twisting process being in an intermediate state, resulting in a decrease in the instantaneous brightness and contrast of the picture.

[0006] The present application provides a display driving method, which is applied to a display device including a display module and a backlight module. The display driving method includes:

[0007] decoding a video source signal to output display data;

[0008] performing overdrive processing on the display data to output a display control signal, and controlling the display module to work according to the display control signal;

[0009] performing overdrive processing on the display data to output a backlight control signal, and controlling the backlight module to work according to the backlight control signal.

[0010] In some embodiments of the display driving method, the display module includes a plurality of display partitions. The step of performing overdrive processing on the display data to output a display control signal, and controlling the display module to work according to the display control signal includes:

[0011] obtaining first gray scale data corresponding to a target frame image in the display data and second gray scale data corresponding to a previous frame image of the target frame image;

[0012] According to the first gray scale data, the second gray scale data and the first preset lookup table, a target frame image corresponding display overdrive value of each display partition is obtained;

[0013] According to the display overdrive value, a display control signal is outputted to control the multiple display partitions in the display module to work.

[0014] In the display driving method in some embodiments, the backlight module includes multiple backlight partitions corresponding to the display partitions, the display data is overdriven to output a backlight control signal, and the step of controlling the backlight module to work according to the backlight control signal includes:

[0015] The first gray scale data corresponding to a target frame image in the display data and the second gray scale data corresponding to a previous frame image of the target frame image are obtained;

[0016] According to the first gray scale data, the second gray scale data and the second preset lookup table, a target frame image corresponding backlight overdrive value of each backlight partition is obtained;

[0017] According to the backlight overdrive value, a backlight control signal is outputted to control the backlight partitions corresponding to the display partitions in the backlight module to work.

[0018] In the display driving method in some embodiments, the step of outputting the display control signal according to the display overdrive value and controlling the multiple display partitions in the display module to work includes:

[0019] The display control signal is outputted according to the display overdrive value, and the multiple display partitions are controlled to work row by row according to the row where the display partition is located.

[0020] In the display driving method in some embodiments, the step of outputting the backlight control signal according to the backlight overdrive value and controlling the backlight partitions corresponding to the display partitions in the backlight module to work includes:

[0021] The backlight control signal is outputted according to the backlight overdrive value, and the multiple backlight partitions corresponding to the display partitions are controlled to work row by row according to the row where the display partition is located.

[0022] In the display driving method in some embodiments, the display driving method further includes:

[0023] The first preset lookup table and the second preset lookup table are stored in advance.

[0024] Embodiments of the present application also provide a display driving system, which is applied to a display device, the display device includes a display module and a backlight module, and the display driving system includes:

[0025] A master control module, which is connected with the display module, is used to decode a video source signal to output display data, and control the display module to work after overdriving the display data.

[0026] The backlight control module is connected with the master control module and the backlight module respectively, and is used for controlling the backlight module to work after overdrive processing of the display data according to the synchronization signal and the display data output by the master control module.

[0027] In some embodiments, the display driving system includes a display module including a plurality of display partitions; and the master control module is specifically used for:

[0028] obtaining first gray scale data corresponding to a target frame image in the display data and second gray scale data corresponding to a previous frame image of the target frame image,

[0029] obtaining a display overdrive value corresponding to each display partition of the target frame image according to the first gray scale data, the second gray scale data and a first preset lookup table;

[0030] outputting a display control signal according to the display overdrive value, and controlling the plurality of display partitions in the display module to work row by row.

[0031] In some embodiments, the display driving system includes a backlight module including a plurality of backlight partitions corresponding to the display partitions; and the backlight control module is specifically used for:

[0032] obtaining first gray scale data corresponding to a target frame image in the display data and second gray scale data corresponding to a previous frame image of the target frame image;

[0033] obtaining a backlight overdrive value corresponding to each backlight partition of the target frame image according to the first gray scale data, the second gray scale data and a second preset lookup table;

[0034] outputting a backlight control signal according to the backlight overdrive value, and controlling the backlight partitions corresponding to the display partitions in the backlight module to work row by row.

[0035] The application further provides a display device, which includes a display module, a backlight module and the display driving system.

[0036] The display driving method, system and display device provided by the application can alleviate the ghosting problem caused by the long response time of liquid crystal molecules under the action of an electric field in a display module. Meanwhile, the display data is also overdriven before driving the backlight module to work, so that the brightness of the liquid crystal in the intermediate state of the transmittance in the twisting process can be compensated, which is conducive to improving the instantaneous brightness and contrast of the picture. The display control of the display module and the backlight module is overdriven, so that the brightness information in the twisting process of the liquid crystal can be improved, not only the brightness of the whole machine, but also the clarity of the moving picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0038] Figure 1 A schematic diagram of a curve showing the excitation signal and display brightness of liquid crystal molecules provided in an embodiment of the present application.

[0039] Figure 2 and Figure 3 A schematic diagram of the relationship between pixel voltage and time for overdriving control of a display module provided in an embodiment of the present application.

[0040] Figure 4 A flow chart of a display driving method provided in an embodiment of the present application.

[0041] Figure 5 This is a flow chart of step 200 in the display driving method provided in an embodiment of the present application.

[0042] Figure 6 A schematic diagram of the relationship of the first preset lookup table in the display driving method provided in an embodiment of the present application.

[0043] Figure 7 This is a flow chart of step 300 in the display driving method provided in an embodiment of the present application.

[0044] Figure 8 This is a schematic diagram of backlight partitions in a backlight module in a display driving method provided in an embodiment of the present application.

[0045] Figure 9 This is a waveform diagram of the backlight control signal of the backlight module in the display driving method provided in an embodiment of the present application.

[0046] Figure 10 This is a schematic diagram of the relationship between pixel voltage and time when the display module and backlight module are simultaneously overdriven in the display driving method provided in an embodiment of the present application.

[0047] Figure 11 This is a structural block diagram of the display drive system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. The features specified as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0050] Liquid crystal display devices are widely used in terminal devices such as televisions and monitors due to their advantages such as lightness, thinness and low power consumption. During the display process of liquid crystal display devices, the liquid crystal molecules have a certain response time under the action of the electric field, such as Figure 1 As shown in FIG, when an excitation signal is applied to the liquid crystal, the liquid crystal needs a period of time to twist, so there is a period of delay before the brightness reaches a certain value after the excitation signal is applied.

[0051] In order to alleviate the long response time of liquid crystal molecules under the action of electric field, which leads to the problem of ghosting when displaying dynamic images, OD (Over Drive) driving method is used to improve the response time of liquid crystal, allowing the liquid crystal to twist quickly, so that the pixel brightness is closer to the actual image to be presented. Overdrive uses the electric field acceleration effect to insert another frame between two frames, apply a higher compensation voltage, and force the liquid crystal molecules to change their arrangement in a shorter time, from low brightness grayscale to the predetermined high brightness grayscale, thereby improving the response time of the liquid crystal. Figure 2 As shown in FIG, when the frame frequency is 60 Hz, applying the compensation voltage V3 to the pixel voltage can shorten the time it takes for the pixel brightness to reach the brightness b from the brightness a. Figure 3 As shown, when the frame frequency is 120 Hz, applying the compensation voltage V4 to the pixel voltage can shorten the time it takes for the pixel brightness to reach the brightness b from the brightness a.

[0052] See also Figure 4 The embodiment of the present application provides a display driving method, which is applied to a display device, wherein the display device includes a display module and a backlight module; the display driving method includes the following steps:

[0053] 100. Decode the video source signal and output display data;

[0054] 200. Output a display control signal after overdriving the display data, and control the display module to operate according to the display control signal;

[0055] 300 , outputting a backlight control signal after overdriving the display data, and controlling the backlight module to operate according to the backlight control signal.

[0056] In this embodiment, when controlling the display device to display, the corresponding display data is obtained based on the decoding of the video source signal, and the display data is overdriven before the display module is driven to work, thereby alleviating the problem of ghosting caused by the long response time of the liquid crystal molecules in the display module under the action of the electric field. At the same time, the display data is also overdriven before the backlight module is driven to work, thereby compensating for the brightness of the liquid crystal in the intermediate state of light transmittance during the twisting process, which is beneficial to improving the instantaneous brightness and contrast of the picture. In this embodiment, by overdriving the display control of both the display module and the backlight module, the brightness information of the liquid crystal twisting process can be improved, which can not only improve the brightness of the entire device, but also improve the clarity of the motion picture.

[0057] See also Figure 5 In some embodiments, the display module includes multiple display partitions, and the backlight module includes multiple backlight partitions corresponding to the display partitions. Step 200 includes:

[0058] 210. Acquire first grayscale data corresponding to a target frame image and second grayscale data corresponding to a frame image preceding the target frame image in the display data;

[0059] 220. Obtain a display overdrive value corresponding to each display subarea of ​​the target frame image according to the first grayscale data, the second grayscale data, and a first preset lookup table;

[0060] 230. Output a display control signal according to the display overdrive value to control the operation of multiple display partitions in the display module.

[0061] When controlling the operation of the display module, the first grayscale data of the target frame image and the second grayscale data corresponding to the previous frame image of the target frame image are obtained for the display data, and the target frame image is the image to be displayed. The second grayscale data of the previous frame image of the target frame image is used as a reference to determine the relationship between the second grayscale data and the first grayscale data, and then determine the corresponding display overdrive value according to the first preset lookup table. Thereafter, a display control signal such as a pixel voltage is output according to the display overdrive value to control the display partition operation in the display module. Among them, the first preset lookup table is pre-stored, and the table includes different first grayscale data and different second grayscale data. The corresponding display overdrive value will be found according to the first grayscale data and the second grayscale data. For example, Figure 6 As shown in the figure, the first grayscale data is 48, the second grayscale data is 16, and the corresponding display overdrive value is 124; the first grayscale data is 64, the second grayscale data is 16, and the corresponding display overdrive value is 153. Then, the corresponding pixel voltage is output according to the display overdrive value, thereby realizing the overdrive control process of the display module.

[0062] See also Figure 7 In some embodiments, step 300 includes:

[0063] 310、obtaining first gray scale data corresponding to the target frame image in the display data and second gray scale data corresponding to a previous frame image of the target frame image;

[0064] 320、obtaining a backlight overdrive value corresponding to each backlight partition of the target frame image according to the first gray scale data, the second gray scale data and a second preset lookup table;

[0065] 330、outputting a backlight control signal according to the backlight overdrive value to control the backlight partition corresponding to the display partition in the backlight module to work.

[0066] Because the display device normally watches the displayed picture, the display gray scale of different areas of the picture is different, and the backlight needs to be overdriven and supplemented according to the comparison of the gray scale data of the target frame and the previous frame picture. When the display module is partitioned, the backlight also needs to be locally partitioned and driven, and each backlight partition is controlled individually to be overdriven and supplemented. The more the number of partitions is, the more precise the backlight overdrive effect control is, and the better the compensation effect is, as shown in Figure 8 As shown in the backlight partition diagram of the backlight module, when the backlight module is overdriven and controlled, the first gray scale data corresponding to the target frame image in the display data and the second gray scale data corresponding to the previous frame image of the target frame image are also obtained. The second gray scale data of the previous frame image of the target frame image is taken as a reference to determine the relationship between the second gray scale data and the first gray scale data, and then the corresponding backlight overdrive value is determined according to the second preset lookup table. Then, the backlight control signal such as the PWM signal is outputted according to the backlight overdrive value to control the backlight partition corresponding to the display partition in the backlight module to work. Similarly, the second preset lookup table is similar to the first preset lookup table, and the second preset lookup table has multiple different first gray scale data, second gray scale data and backlight overdrive values. Since the first preset lookup table is described in detail above, it will not be described here.

[0067] As an embodiment, when the display module is controlled to display, a display control signal is outputted according to the display overdrive value, and multiple display partitions are controlled to work row by row according to the rows where the display partitions are located. Similarly, when the backlight module is controlled to display, a backlight control signal is outputted according to the backlight overdrive value, and multiple backlight partitions corresponding to the display partitions are controlled to work row by row according to the rows where the display partitions are located. The driving display principle of the display module in this embodiment is to display from top to bottom in turn through row-by-row scanning, so the display module is driven from top to bottom in each row, and there is a time difference between rows. In order to make good compensation of the backlight overdrive, the backlight needs to be designed as a scanning backlight which is turned on from top to bottom in turn according to the display principle of the display module, combined with Figure 9For example, the backlight takes the screen field frequency signal STV as a synchronization signal Vsync, and scans according to 8 zones from top to bottom. After the display zone of each backlight zone is turned on, the backlight is turned on, and the cycle is repeated to complete a frame of picture display.

[0068] Please refer to Figure 10 The display driving method in the application provides compensation voltage V4 for pixel voltage and compensation voltage Y1 for the backlight module simultaneously through overdrive control, greatly shortens the time of pixel brightness from brightness a to brightness b, and can improve the brightness information in the liquid crystal twist process, not only the brightness of the whole machine, but also the clarity of the motion picture.

[0069] Please refer to Figure 11 The application further provides a display driving system applied to a display device, the display device comprising a display module 10 and a backlight module 20. The display driving system comprises a master control module 30 and a backlight control module 40. The master control module 30 is connected with the display module 10, and the backlight control module 40 is connected with the master control module 30 and the backlight module 20 respectively.

[0070] The master control module 30 is configured to acquire a video source signal, decode the video source signal, and output display data to the backlight control module 40. The master control module 30 is also configured to output a synchronization signal to the backlight control module 40 through an SPI bus, so as to realize the synchronization of the backlight driving and the display driving. The master control module 30 is further configured to control the display module 10 to work after overdrive processing of the decoded display data, so as to relieve the trailing problem caused by the long response time of liquid crystal molecules in the display module 10 under the action of an electric field. The backlight control module 40 is configured to control the backlight module 20 to work after overdrive processing of the display data according to the synchronization signal and the display data, so as to compensate the brightness of the liquid crystal in the intermediate state of the transmittance in the twist process, and improve the instantaneous brightness and contrast of the picture. The display driving system in the application can improve the brightness information in the liquid crystal twist process, not only the brightness of the whole machine, but also the clarity of the motion picture, through overdrive processing of the master control module 30 and the backlight control module 40.

[0071] In some embodiments, the screen-side overdrive unit is integrated in the master module 30, and the display data of the display module 10 is overdriven by the screen-side overdrive unit. Accordingly, the master module 30 is specifically configured to acquire first gray scale data corresponding to a target frame image in the display data and second gray scale data corresponding to a previous frame image of the target frame image, acquire a display overdrive value corresponding to each display partition of the target frame image according to the first gray scale data, the second gray scale data, and a first preset lookup table, output a display control signal according to the display overdrive value, and control the multiple display partitions in the display module 10 row by row to ensure normal operation of the display module 10.

[0072] In some embodiments, the backlight control module 40 is integrated with a backlight overdrive unit, and the display data is overdriven by the backlight overdrive unit. Accordingly, the first gray scale data corresponding to the target frame image in the display data and the second gray scale data corresponding to the previous frame image of the target frame image are acquired, the backlight overdrive value corresponding to each backlight partition of the target frame image is acquired according to the first gray scale data, the second gray scale data, and a second preset lookup table, and a backlight control signal is output according to the backlight overdrive value to control the backlight partitions corresponding to the display partitions in the backlight module 20 row by row to achieve the partitioned row-by-row scanning control of the backlight module 20.

[0073] The application further discloses a display device, which comprises a display module, a backlight module, and the display driving system described above. Since the display driving system is described in detail above, no further description is given here.

[0074] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0075] The display driving method provided by the embodiments of the application is described in detail above, and the principle and implementation manner of the application are described by applying specific examples. The above embodiment description is only used to help understand the technical solutions and core ideas of the application; those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A display driving method, characterized in that: The display driving method is applied to a display device, wherein the display device includes a display module and a backlight module, and is characterized in that the display driving method includes: Decode the video source signal and output display data; Outputting a display control signal after overdriving the display data, and controlling the operation of the display module according to the display control signal; The display data is overdriven and then outputted as a backlight control signal, and the backlight module is controlled to operate according to the backlight control signal.

2. The display driving method according to claim 1, wherein: The display module includes a plurality of display partitions; the steps of overdriving the display data and then outputting a display control signal, and controlling the operation of the display module according to the display control signal include: Acquire first grayscale data corresponding to a target frame image in the display data and second grayscale data corresponding to a frame image preceding the target frame image; Obtaining a display overdrive value corresponding to each display subarea of ​​the target frame image according to the first grayscale data, the second grayscale data, and a first preset lookup table; A display control signal is output according to the display overdrive value to control the operation of the plurality of display partitions in the display module.

3. The display driving method according to claim 2, wherein: The backlight module includes a plurality of backlight partitions corresponding to the display partitions. The steps of outputting a backlight control signal after overdriving the display data and controlling the backlight module according to the backlight control signal include: Acquire first grayscale data corresponding to a target frame image in the display data and second grayscale data corresponding to a frame image preceding the target frame image; Acquire a backlight overdrive value corresponding to each backlight subarea of ​​the target frame image according to the first grayscale data, the second grayscale data, and a second preset lookup table; A backlight control signal is output according to the backlight overdrive value to control the backlight subarea corresponding to the display subarea in the backlight module to operate.

4. The display driving method according to claim 3, wherein: The step of outputting a display control signal according to the display overdrive value to control the operation of the plurality of display partitions in the display module includes: A display control signal is outputted according to the display overdrive value, and the operation of the plurality of display partitions is controlled row by row according to the rows where the display partitions are located.

5. The display driving method according to claim 4, wherein: The step of outputting a backlight control signal according to the backlight overdrive value to control the backlight subarea corresponding to the display subarea in the backlight module to operate includes: A backlight control signal is outputted according to the backlight overdrive value, and a plurality of backlight partitions corresponding to the display partition are controlled to operate row by row according to the row where the display partition is located.

6. The display driving method according to claim 5, wherein: The display driving method further includes: A first preset lookup table and a second preset lookup table are pre-stored.

7. A display driving system, characterized in that: The display driving system is applied to a display device, wherein the display device includes a display module and a backlight module. The display driving system includes: A main control module, connected to the display module, configured to decode the video source signal and output display data, and perform overdrive processing on the display data to control the operation of the display module; A backlight control module is connected to the main control module and the backlight module respectively. The backlight control module is used to control the operation of the backlight module after overdriving the display data according to the synchronization signal output by the main control module and the display data.

8. The display driving system according to claim 7, wherein: The display module includes multiple display partitions; the main control module is specifically used to: Acquire first grayscale data corresponding to a target frame image in the display data and second grayscale data corresponding to a frame image preceding the target frame image, Obtaining a display overdrive value corresponding to each display subarea of ​​the target frame image according to the first grayscale data, the second grayscale data, and a first preset lookup table; A display control signal is outputted according to the display overdrive value to control the operation of the plurality of display partitions in the display module row by row.

9. The display driving system according to claim 8, wherein: The backlight module includes a plurality of backlight partitions corresponding to the display partitions; the backlight control module is specifically used to: Acquire first grayscale data corresponding to a target frame image in the display data and second grayscale data corresponding to a frame image preceding the target frame image; Acquire a backlight overdrive value corresponding to each backlight subarea of ​​the target frame image according to the first grayscale data, the second grayscale data, and a second preset lookup table; A backlight control signal is outputted according to the backlight overdrive value, and the backlight subareas corresponding to the display subareas in the backlight module are controlled to operate row by row.

10. A display device, characterized in that: The display device includes a display module, a backlight module and a display driving system according to any one of claims 7 to 9.

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