WO2020192351A1 - Backlight driving method and circuit, driving method and device for display, and display device - Google Patents

Abstract

Provided is a backlight driving method, the backlight driving method being used for driving a spliced backlight module (2) to emit light, wherein the spliced backlight module (2) comprises at least two sub backlight modules (20) successively arranged in a column direction, and each of the sub backlight modules (20) extends in a row direction, and each of the sub backlight modules (20) corresponds to at least a row of pixels in a liquid crystal display panel (1). The backlight driving method comprises: periodically and circularly controlling, according to the sequence in which at least two sub backlight modules (2) are arranged, each sub backlight module (20) to emit light; a starting moment of light emission of each sub backlight module (20) being after liquid crystals of each row of pixels corresponding to the sub backlight module (20) are turned over in the current frame period; and an ending moment of light emission of each sub backlight module (20) being before liquid crystals of each row of pixels corresponding to the sub backlight module (20) are turned over in the next frame period.

Description

Backlight driving method and circuit, display driving method and device, and display device

This application claims the priority of the Chinese patent application with application number 201910238573.0 filed on March 27, 2019, the entire content of which is incorporated into this application by reference.

Technical field

The present disclosure relates to the field of display technology, and in particular to a backlight driving method and circuit, a display driving method and device, and a display device.

Background technique

In the field of Augmented Reality (AR) and Virtual Reality (VR) display technologies, head-mounted display devices are more commonly used display devices.

The head-mounted display device may, for example, use a liquid crystal display module for display. The liquid crystal display module generally includes a liquid crystal display panel and a backlight module. The backlight module is driven by the driving chip of the liquid crystal display module to provide backlight to the liquid crystal display panel so that the liquid crystal display panel can display images.

At present, with the continuous development of AR and VR display technologies, the requirements for the backlight brightness and refresh frequency of head-mounted display devices are also increasing.

Summary of the invention

In one aspect, a backlight driving method is provided. The backlight driving method is used to drive a spliced backlight module to emit light; the spliced backlight module includes at least two sub-backlight modules arranged in a row direction, and each sub-backlight module is The row direction extends, and each of the sub-backlight modules corresponds to at least one row of pixels in the liquid crystal display panel.

The backlight driving method includes: according to the order in which the at least two sub-backlight modules are arranged, periodically and cyclically controlling the light emission of each sub-backlight module; After the liquid crystal of each row of pixels corresponding to the group is flipped in the current frame period; the end time of each sub-backlight module emitting light is before the liquid crystal of each row of pixels corresponding to the sub-backlight module is flipped in the next frame period.

In some embodiments, the at least two sub-backlight modules are respectively controlled by at least two pulse width modulation signals; in each periodical cycle control process of the at least two sub-backlight modules, each pulse width The pulses used in the modulation signal to control the light emission of the corresponding sub-backlight modules are sequentially formed in the order in which the corresponding sub-backlight modules are arranged.

In some embodiments, the duty cycle of each pulse width modulation signal is the same.

In some embodiments, the liquid crystal display panel includes a left sub-screen for viewing by the user's left eye, and a right sub-screen for viewing by the user's right eye; the splicing backlight module includes the same as the left sub-screen Correspondingly set the left backlight module and the right backlight module corresponding to the right sub-screen.

The backlight driving method includes: when the liquid crystal inversion of the pixel corresponding to the left sub-screen is completed and the liquid crystal of the pixel corresponding to the right sub-screen starts to invert, controlling the left backlight module to emit light, so that the left sub-screen The screen displays the left-eye image of the current frame in the current frame period; when the liquid crystal inversion of the pixel corresponding to the right sub-screen is completed, the left backlight module is controlled to stop emitting light; the liquid crystal of the pixel corresponding to the left sub-screen Before starting to flip, the right backlight module is controlled to emit light, so that the right sub-screen displays the right eye image of the current frame in the next frame period.

In some embodiments, the duration of each frame period is T; in each frame period, the frame scan signal used to drive each pixel row of the left sub-screen and the right sub-screen flipped within the frame period The duty cycle of is a%; the duty cycle of the pulse width modulation signal used to control the left backlight module and the right backlight module are both b%.

In a frame period, the time at which the frame scanning signal of the frame period starts to be received is the initial time, which is used to control the length of time between the start time of the pulse of the pulse width modulation signal of the left backlight module and the initial time Δt _{1 is} less than or equal to T×(1-b%); the time length Δt ₂ between the start time of the pulse of the pulse width modulation signal of the right backlight module and the initial time is less than or equal to T×[ (1-a%)/2-b%].

In some embodiments, the light-emitting periods of the sub-backlight modules included in the spliced backlight module do not overlap with each other.

In some embodiments, among the sub-backlight modules included in the spliced backlight module, at least two sub-backlight modules have overlapping light-emitting periods.

In another aspect, a backlight driving circuit is provided for driving a spliced backlight module to emit light; the spliced backlight module includes at least two sub-backlight modules arranged in sequence along the column direction, and each sub-backlight module extends in the row direction, And each of the sub-backlight modules corresponds to at least one row of pixels in the liquid crystal display panel.

The backlight drive circuit is configured to periodically and cyclically control the light emission of each sub-backlight module according to the order in which the at least two sub-backlight modules are arranged; After the liquid crystal of each row of pixels corresponding to the sub-backlight module is reversed in the current frame period; the end time of making each sub-backlight module emit light is before the liquid crystal of each row of pixels corresponding to the sub-backlight module is reversed in the next frame period .

In some embodiments, the backlight driving circuit includes at least two pulse width modulation sub-circuits, the at least two pulse width modulation sub-circuits are respectively coupled to the at least two sub-backlight modules; each pulse width modulation sub-circuit The circuit is configured to transmit a pulse width modulation signal to the sub backlight module coupled to the pulse width modulation sub circuit to control the sub backlight module to emit light.

In some embodiments, the duty cycle of the pulse width modulation signal transmitted by each pulse width modulation sub-circuit is the same.

In yet another aspect, a method for driving a display is provided for driving a display including a liquid crystal display panel and a spliced backlight module; wherein the spliced backlight module includes at least two sub-backlight modules sequentially arranged in a column direction, each A number of sub-backlight modules extend along the row direction, and each of the sub-backlight modules corresponds to at least one row of pixels in the liquid crystal display panel.

The driving method includes: inputting a frame scan signal of the current frame period to the liquid crystal display panel, and driving each row of pixels of the liquid crystal display panel to start to reverse row by row; when the liquid crystal of each row of pixels corresponding to the first sub-backlight module is reversed After completion, control the first sub-backlight module to start to emit light; according to the arrangement sequence of the at least two sub-backlight modules, when the liquid crystal inversion of each row of pixels corresponding to the i-th sub-backlight module is completed, control the i-th sub-backlight module The group starts to emit light, where i takes values in sequence from the set of [2, N], N is a positive integer greater than or equal to 2, and N is the number of sub-backlight modules included in the spliced backlight module; After the liquid crystal inversion of the last row of pixels of the liquid crystal display panel is completed, the frame scan signal of the next frame period is received; each row of pixels of the liquid crystal display panel starts to be inverted line by line under the drive of the frame scan signal of the next frame period Before, the first sub-backlight module is controlled to stop emitting light; according to the sequence of the at least two sub-backlight modules, the liquid crystals of each row of pixels corresponding to the i-th sub-backlight module are driven by the frame scan signal of the next frame period Before turning over, control the i-th sub-backlight module to stop emitting light.

In another aspect, a display driving device is provided for driving a display including a liquid crystal display panel and a splicing backlight module. The driving device includes a frame scan synchronization circuit, a display driving circuit and a backlight driving circuit. Wherein, the frame scan synchronization circuit is configured to receive frame scan signals of each frame period; the display drive circuit is coupled to the frame scan synchronization circuit, and the display drive circuit is configured to, according to each frame period The frame scan signal drives the liquid crystals of each row of pixels in the liquid crystal display panel to start to reverse row by row; the backlight drive circuit is coupled to the display drive circuit and the splicing backlight module, and the backlight drive circuit is configured to: According to the sequence in which the at least two sub-backlight modules included in the spliced backlight module are arranged, each sub-backlight module is periodically and cyclically controlled to emit light, and each of the sub-backlight modules starts to emit light at the time when the sub-backlight module starts to emit light. After the liquid crystal of each row of pixels corresponding to the module is reversed in the current frame period, the end time of making each sub-backlight module emit light is before the liquid crystal of each row of pixels corresponding to the sub-backlight module is reversed in the next frame period.

In some embodiments, the frame scan synchronization circuit and the display driving circuit are integrated.

In some embodiments, the frame scan synchronization circuit, the display driving circuit and the backlight driving circuit are integrated.

In another aspect, a display device is provided. The display device includes a liquid crystal display panel, a splicing backlight module, and a display driving device. Wherein, the splicing backlight module is arranged on the non-display surface side of the liquid crystal display panel, the splicing backlight module includes at least two sub-backlight modules arranged in sequence along the column direction, and each sub-backlight module extends in the row direction , And each of the sub-backlight modules corresponds to at least one row of pixels in the liquid crystal display panel; the driving device of the display is coupled to the liquid crystal display panel and the splicing backlight module, and the driving device is as described above The driving device of the display described in some embodiments.

In yet another aspect, a computer-readable storage medium is provided, and computer program instructions are stored, and when the computer program instructions are executed by a processor, one or more steps in the backlight driving method described in some of the above embodiments can be implemented. .

Description of the drawings

In order to explain the technical solutions of the present disclosure more clearly, the following will briefly introduce the drawings that need to be used in some embodiments of the present disclosure. Obviously, the drawings in the following description are merely appendices to some embodiments of the present disclosure. Figures, for those of ordinary skill in the art, other drawings can be obtained based on these drawings. In addition, the drawings in the following description may be regarded as schematic diagrams, and are not limitations on the actual size of the products involved in the embodiments of the present disclosure, the actual process of the method, and the actual timing of the signals.

Figure 1 is a structural diagram of a liquid crystal display module provided according to related technologies;

FIG. 2 is a timing diagram of backlight driving provided according to related technologies;

3 is a corresponding diagram of a spliced backlight module and a liquid crystal display panel provided according to some embodiments of the present disclosure;

4 is a flowchart of a method for driving a display according to some embodiments of the present disclosure;

FIG. 5 is a timing diagram of a method for driving a display according to some embodiments of the present disclosure;

FIG. 6 is another timing diagram of a driving method of a display according to some embodiments of the present disclosure;

FIG. 7 is another timing diagram of a driving method of a display according to some embodiments of the present disclosure;

FIG. 8 is a schematic diagram of a head-mounted display device provided according to some embodiments of the present disclosure;

FIG. 9 is a flowchart of a method for driving a head-mounted display device according to some embodiments of the present disclosure;

FIG. 10 is a timing diagram of a driving method of a head-mounted display device according to some embodiments of the present disclosure;

FIG. 11 is a structural diagram of a display device provided according to some embodiments of the present disclosure;

FIG. 12 is a structural diagram of a backlight driving circuit provided according to an embodiment of the present disclosure.

detailed description

The technical solutions in some embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art fall within the protection scope of the present disclosure.

Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms such as the third-person singular form "comprises" and the present participle form "comprising" are Interpreted as open and inclusive means "including, but not limited to." In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", "specific examples" "example)" or "some examples" are intended to indicate that a specific feature, structure, material, or characteristic related to the embodiment or example is included in at least one embodiment or example of the present disclosure. The schematic representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any suitable manner.

Hereinafter, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

In describing some embodiments, the expressions "coupled" and "connected" and their extensions may be used. For example, the term "connected" may be used when describing some embodiments to indicate that two or more components are in direct physical or electrical contact with each other. As another example, the term “coupled” may be used when describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content herein.

"At least one of A, B, and C" has the same meaning as "at least one of A, B, or C", and both include the following combinations of A, B, and C: only A, only B, only C, A and B The combination of A and C, the combination of B and C, and the combination of A, B and C.

"A and/or B" includes the following three combinations: A only, B only, and the combination of A and B.

As shown in FIG. 1, FIG. 1 shows a cross-sectional view of a liquid crystal display module 100'. The liquid crystal display panel 100' mainly includes a liquid crystal display panel 1 and a backlight module 2'arranged on the non-display surface side of the liquid crystal display panel 1 (that is, the side opposite to the display surface side of the liquid crystal display panel 1).

Among them, the liquid crystal display panel 1 includes an array substrate 11, an alignment substrate 12, and a liquid crystal layer 13 provided between the array substrate 11 and the alignment substrate 12.

The liquid crystal display panel 1 includes a plurality of pixels arranged in an array. In each sub-pixel area, the array substrate 11 is provided with a thin film transistor 111 and a pixel electrode 112 on the first substrate 110. The thin film transistor 111 includes an active layer, a source electrode, a drain electrode, and a gate electrode. The source electrode and the drain electrode are respectively in contact with the active layer, and the pixel electrode 112 is electrically connected to the drain electrode of the thin film transistor 111. In some embodiments, the array substrate 11 further includes a common electrode 113 disposed on the first substrate 110. The array substrate 11 may further include a multi-layer insulating layer disposed between two adjacent conductive film layers, for example, as shown in FIG. 1, the insulating layer 116 between the gate layer where the gate is located and the active layer, The insulating layer 115 between the source and drain electrode layers and the common electrode layer where the common electrode 113 is located, and the insulating layer 114 between the common electrode layer and the pixel electrode layer where the pixel electrode 112 is located.

The pixel voltage is applied to the pixel electrode 112 through the thin film transistor 111 on the array substrate 11, and the common voltage is applied to the common electrode 113, so that there is a voltage difference between the pixel voltage 112 and the common electrode 113, thereby forming a driving liquid crystal in the liquid crystal layer 13 The flipped electric field. Changing the pixel voltage applied to the pixel electrode 112 can change the intensity of the electric field, so that the liquid crystal can be flipped to different degrees.

The box substrate 12 includes a color filter layer 121 disposed on the second substrate 120. In this case, the box substrate 12 may also be referred to as a color filter substrate (CF). The color filter layer 121 includes at least a red filter part, a green filter part and a blue filter part, and the red filter part, the green filter part and the blue filter part are respectively arranged in different pixel regions. The box substrate 12 further includes a black matrix pattern 122 disposed on the second substrate 120, and the black matrix pattern 122 is used to separate the red filter portion, the green filter portion, and the blue filter portion.

The liquid crystal display panel 1 further includes an upper polarizer 14 arranged on the side of the cell-matching substrate 12 away from the liquid crystal layer 13 and a lower polarizer 15 arranged on the side of the array substrate 11 away from the liquid crystal layer 13.

The backlight module 2'is arranged on the non-display side of the liquid crystal display panel 1, and the light emitted from the backlight module 2'sequentially passes through the lower polarizer 1, the array substrate 11, the liquid crystal layer 13, the cell substrate 12 and the upper polarizer 14. Enable the LCD to display images.

In some head-mounted display devices, the above-mentioned liquid crystal display module 100' is used to display images. When using a head-mounted display device, as the body moves, the eyes often track the movement of the object. In this case, the pixels of each frame seen by the human eye will slide, and the afterglow effect of the human eye will make the observer see Smear phenomenon.

In the related art, in order to reduce the smear phenomenon of the head-mounted display device, a pulse driving technology is adopted for the backlight module 2'to reduce the smear phenomenon by reducing the afterglow time. As shown in Figure 2, the low level of the TE signal (that is, the Ta period) represents the scanning and driving time of each row of pixels in a frame period T; when the TE signal is high (that is, the Tb period), the liquid crystal is inverted in response to the scanning and driving; In the Tc period, the CN signal is high and the backlight module 2'is turned on.

Limited by the scanning capability of the driving chip of the liquid crystal display module 100', the scanning time Ta of the driving chip is fixed, and the response time Tb of the liquid crystal is also fixed. In the pursuit of a high screen refresh rate, it is necessary to increase the refresh rate of the backlight module 2'accordingly, which will reduce the turn-on time Tc of the backlight module 2', thereby reducing the brightness of the backlight module 2'.

If the refresh frequency of the backlight module 2'is increased, the backlight module 2'maintains a certain brightness, and the turn-on time Tc of the backlight module 2'can be kept unchanged, but this requires the backlight to be turned on when the liquid crystal responds (ie, T2 period) Module 2', which brings about smear phenomenon.

If the refresh frequency of the backlight module 2'is increased and the turn-on time Tc of the backlight module 2'is reduced, in order to maintain a certain brightness of the backlight module 2', the working current of the light source in the backlight module can be increased to increase the brightness, but This will bring a series of problems such as heat generation, increased power consumption, and film wrinkles.

Based on the above analysis, some embodiments of the present disclosure provide a display driving method, which is used to drive a display including a liquid crystal display panel and a spliced backlight module.

Among them, the structure of the liquid crystal display panel can refer to the liquid crystal display panel 1 shown in FIG. 1 and the corresponding description above, which will not be repeated here.

The spliced backlight module includes N sub-backlight modules, and the N sub-backlight modules are sequentially arranged in a row direction or a column direction, where N is a positive integer greater than or equal to 2. It should be noted that the multiple pixels in the liquid crystal display panel are arranged in an array. Based on this, the row direction refers to the row direction of the multiple pixels in the liquid crystal display panel; the column direction refers to the The column direction in which multiple pixels are arranged.

Optionally, the liquid crystal display panel adopts a row-driving manner for display, and the N sub-backlight modules are sequentially arranged along the column direction, and each sub-backlight module may correspond to at least one row of pixels in the liquid crystal display panel. That is to say, the multiple rows of pixels in the liquid crystal display panel are divided into N groups, each group includes at least one row of pixels, so that each group of pixels corresponds to a sub-backlight module, that is, each group of pixels and a sub-backlight module are in the liquid crystal The orthographic projections on the display surface of the display panel overlap or substantially overlap.

Optionally, the liquid crystal display panel adopts a column driving mode for display, and the N sub-backlight modules are sequentially arranged along the row direction, and each sub-backlight module may correspond to at least one column of pixels in the liquid crystal display panel. In other words, the multiple columns of pixels in the liquid crystal display panel are divided into N groups, and each group includes at least one column of pixels, so that each group of pixels corresponds to a sub-backlight module, that is, each group of pixels and a sub-backlight module are in the liquid crystal The orthographic projections on the display surface of the display panel overlap or substantially overlap.

Since a row of pixels in a liquid crystal display panel is a row of pixels or a column of pixels, it depends on the relative position of the liquid crystal display panel and the user, that is, a row of pixels in the user’s eyes will appear as a column of pixels after turning 90° counterclockwise, so the backlight is spliced Regardless of whether the sub-backlight modules in the module are arranged in the row direction or in the column direction, their relationship with the corresponding pixels in the liquid crystal display panel is substantially the same.

In the following, the sub-backlight modules in the spliced backlight module are arranged in the column direction, and the liquid crystal display panel adopts a row driving mode for display as an example to illustrate the embodiments of the present disclosure.

Exemplarily, as shown in FIG. 3, the spliced backlight module 2 includes at least two sub-backlight modules 20 arranged in sequence along the column direction D2, each sub-backlight module 20 extends along the row direction D1, and each sub-backlight module 20 It corresponds to at least one row of pixels PX in the liquid crystal display panel 1. For example, FIG. 3 shows that the splicing backlight module 2 includes three sub-backlight modules 20, and each sub-backlight module 20 corresponds to 6 rows of pixels PX in the liquid crystal display panel 1.

Please refer to FIGS. 4-7, the driving method of the display provided by the embodiments of the present disclosure includes:

S1, inputting a frame scan signal of the current frame period to the liquid crystal display panel, and driving each row of pixels of the liquid crystal display panel to start to reverse row by row.

The above frame scan signal is used as the frame display control signal of the liquid crystal display panel. When the current frame needs to be displayed, the frame scan signal input to the liquid crystal display panel is the current frame scan signal corresponding to the current frame; when the next frame needs to be displayed, The frame scan signal input by the liquid crystal display panel is the next frame scan signal corresponding to the next frame.

Optionally, the frame scan signal is shown as the TE signal in FIG. 5, FIG. 6 and FIG. 7, and its frame period is T. In each frame period T, when the frame scan signal is at a low level, the liquid crystals that drive each row of pixels in the liquid crystal display panel are reversed row by row from the first row; when the frame scan signal is at a high level, the driving is stopped.

In some other embodiments, it may also be: in each frame period T, when the frame scan signal is at a high level, the liquid crystals that drive each row of pixels in the liquid crystal display panel are reversed row by row from the first row; the frame scan signal is low When level, stop driving.

The frame scan signal may be divided into a plurality of row scan signals according to the respective rows of pixels to be driven, so that each row scan signal is used to drive the liquid crystal of at least one row of pixels for inversion.

S2, after the liquid crystal inversion of each row of pixels corresponding to the first sub-backlight module is completed, control the first sub-backlight module to emit light.

S3, according to the arrangement sequence of the sub-backlight modules included in the spliced backlight module, after the liquid crystal inversion of each row of pixels corresponding to the i-th sub-backlight module is completed, control the i-th sub-backlight module to start emitting light. Among them, i is taken from the set of [2, N] in sequence, N is a positive integer greater than or equal to 2, and N is the number of sub-backlight modules included in the spliced backlight module.

Exemplarily, the order in which the sub-backlight modules included in the spliced backlight module are arranged is from top to bottom in the column direction, and in this order, each sub-backlight module is the first sub-backlight module, The second sub-backlight module, ... the Nth sub-backlight module.

The value of i is sequentially taken from the set of [2, N], which means that from the second sub-backlight module to the N-th sub-backlight module is controlled to emit light in sequence.

The completion of the above-mentioned liquid crystal inversion of a certain row of pixels means that the liquid crystal molecules corresponding to the liquid crystal of the row of pixels all enter a stable state. It can be understood that it takes a certain period of time for the liquid crystal of each row of pixels to turn from the beginning to when the turning is stable. That is to say, the completion time of the liquid crystal of each row of pixels will lag behind the completion time of the corresponding row scan signal.

It should be noted that the light emission of one of the above-mentioned sub-backlight modules may be performed immediately after the liquid crystal inversion of the row pixels corresponding to the sub-backlight module is completed, or it may be performed after the liquid crystal inversion of the row pixels corresponding to the sub-backlight module is completed. Do it again after a period of time after completion.

Optionally, the light-emitting periods of the sub-backlight modules included in the spliced backlight module do not overlap each other, that is, the light-emitting periods of every two adjacent sub-backlight modules do not overlap, so as to avoid the pixels corresponding to each sub-backlight module. The display in between has an impact.

Optionally, among the sub-backlight modules included in the spliced backlight module, at least two sub-backlight modules have overlapping light-emitting periods. For example, the light-emitting periods of every two adjacent sub-backlight modules partially overlap. In this way, the light-emitting time of the corresponding sub-backlight module can be prolonged, which is beneficial to improve the brightness of the backlight module.

S4, after the liquid crystal inversion of the last row of pixels in the liquid crystal display panel is completed, receive the frame scan signal of the next frame period.

In the current frame time, if the liquid crystals of each row of pixels in the LCD panel have all flipped, it means that the current frame time has ended, and the next frame scan signal can be directly received, and the next frame time can be directly entered. In the frame time, a backlight light emission period dedicated to controlling the light emission of the sub-backlight module is set. Based on this, compared with the need to reserve a special backlight light-emitting period in each frame time in the related art, the solution of the embodiment of the present disclosure can effectively shorten the time period of each frame time, and thus is beneficial to increase the refresh frequency of the display device.

S5: Control the first sub-backlight module to stop emitting light before the pixels of each row of the liquid crystal display panel start to flip line by line under the drive of the frame scan signal of the next frame period.

S6, according to the order of arrangement of the sub-backlight modules included in the spliced backlight module, before the liquid crystal of each row of pixels corresponding to the i-th sub-backlight module starts to flip under the driving of the frame scanning signal of the next frame period, control the i-th Each backlight module stops emitting light.

In the above steps, under the driving of the frame scanning signal of the next frame period, before the liquid crystal of the pixel corresponding to a certain sub-backlight module is inverted, the corresponding sub-backlight module is controlled to stop emitting light; when the sub-backlight module does not emit light After that, the liquid crystal of the pixel corresponding to the sub-backlight module is driven to start inversion. It is understandable that when a certain sub-backlight module does not emit light, it can be regarded as inserting black into the display of the corresponding pixel of the sub-backlight module, which can solve the problem of user dizziness caused by liquid crystal deflection.

According to the driving method of the display provided by the embodiment of the present disclosure, after the liquid crystal of each row of pixels in the liquid crystal display panel is inverted from the first row according to the frame scan signal of the current frame period, the splicing backlight module is sequentially controlled according to the liquid crystal inversion state of each row of pixels The sub-backlight module corresponding to each row of pixels in the group emits light, and directly receives the frame scan signal of the next frame period after the liquid crystal inversion of the last row of pixels in the liquid crystal display panel is completed, and enters the liquid crystal inversion phase of the next frame period, so that Part of the sub-backlight modules in the spliced backlight module can emit light in the next frame period to display part of the picture of the current frame in the next frame period; according to the light-emitting order of each sub-backlight module, such a cycle will form a continuous The screen is displayed.

Therefore, using the display driving method provided by the embodiments of the present disclosure to drive the liquid crystal display panel and the spliced backlight module of the display can effectively shorten the length of each frame period, which is beneficial to increase the refresh frequency of the liquid crystal display panel, that is, It is beneficial to increase the refresh rate of displays including spliced backlight modules and liquid crystal display panels.

Moreover, the light-emitting time of each sub-backlight module in the spliced backlight module can last from after the liquid crystal inversion of the corresponding row of pixels in the current frame period is completed to before the liquid crystal inversion of the corresponding row of pixels in the next frame period. , So that each sub-backlight module has a longer light-emitting time without increasing the working current of the light source in each sub-backlight module, which avoids a series of heat generation, power consumption increase, and film wrinkles caused by this. This problem is beneficial to improve the overall brightness and use stability of the spliced backlight module in each frame time, thereby improving the backlight brightness and use stability of the display including the spliced backlight module and the liquid crystal display panel.

In summary, the display driving method provided by the embodiments of the present disclosure can simultaneously improve the refresh rate, backlight brightness, and use stability of display devices including spliced sub-backlight modules and liquid crystal display panels.

Based on the aforementioned display driving method, some embodiments of the present disclosure provide a backlight driving method, which is used to drive the spliced backlight module described above to emit light.

The backlight driving method includes: according to the arrangement sequence of the sub-backlight modules included in the spliced backlight module, cyclically controlling each sub-backlight module to emit light.

Wherein, the start time of each sub-backlight module emits light after the liquid crystal of each row of pixels corresponding to the sub-backlight module is flipped in the current frame period; the end time of each sub-backlight module emits light at the corresponding sub-backlight module The liquid crystal of each row of pixels is reversed before the next frame period.

Each sub-backlight module of the above spliced backlight module is independently controlled to emit light. Each sub-backlight module in the spliced backlight module can be matched with a pulse width modulation (Pulse Width Modulation, referred to as PWM) signal, so as to utilize each pulse width. The modulation signal respectively controls the light-emitting state of the corresponding sub-backlight module. In some embodiments of the present disclosure, each sub-backlight module of the spliced backlight module is controlled by a corresponding pulse width modulation signal, and each sub-backlight module included in the spliced backlight module is periodically controlled each time. In the process, the pulses used for controlling the light emission of the corresponding sub-backlight modules in each pulse width modulation signal are sequentially formed in the order in which the corresponding sub-backlight modules are arranged. That is to say, according to the order in which the sub-backlight modules are arranged, after the first sub-backlight module is controlled to emit light, the second and subsequent sub-backlight modules will be sequentially controlled to emit light.

Exemplarily, as shown in FIG. 3, the spliced backlight module 2 includes three sub-backlight modules 20 arranged along the column direction D2, which are respectively a first sub-backlight module, a second sub-backlight module and a third sub-backlight module. group. Among them, each sub-backlight module can use the timing control diagram shown in FIG. 5, that is, the pulse width modulation signal corresponding to the first sub-backlight module is as shown in the N1 signal in FIG. The width modulation signal is shown as the N2 signal in FIG. 5, and the pulse width modulation signal corresponding to the third sub-backlight module is shown as the N3 signal in FIG.

Exemplarily, when the frame scan signal TE is the initial frame scan signal and changes from a high level to a low level, and enters the first frame period T1, the high-level signal that controls the first sub-backlight module to emit light is in contact with the first frame period T1. Issued after the liquid crystal inversion of the row of pixels corresponding to the sub-backlight module is completed, and ends before the next frame of scanning signal controls the liquid crystal inversion of the row of pixels; a high-level signal that controls the second sub-backlight module and the third sub-backlight module to emit light , Will follow the high-level signal that controls the first sub-backlight module to emit light according to the order in which it is arranged;

It is understandable that in the first frame period T1 corresponding to the initial frame scanning signal, if the high-level signal for controlling the light emission of the first sub-backlight module has not yet been sent, then it is used to control the second sub-backlight module and the second sub-backlight module. The high-level signal emitted by the three sub-backlight modules may not appear, as shown in Figure 5.

Of course, in the first frame period T1 corresponding to the initial frame scan signal, even if the high-level signal for controlling the first sub-backlight module to emit light has not yet been sent, it is correspondingly used to control the second sub-backlight module and the third sub-backlight The high-level signal for the light emission of the module can still be issued before the high-level signal for controlling the light emission of the first sub-backlight module according to the subsequent cycle, as shown in FIG. 6. Among them, the pulse width modulation signal corresponding to the first sub-backlight module is N1' signal, the pulse width modulation signal corresponding to the second sub-backlight module is N2' signal, and the pulse width modulation signal corresponding to the third sub-backlight module is N3 'signal.

It should be noted that in the first period T1 corresponding to the initial frame scan signal, although the high-level signal used to control the second sub-backlight module and the third sub-backlight module to emit light is controlling the first sub-backlight module to emit light The high-level signal has been sent before, but since the liquid crystal of the corresponding row of pixels has not been flipped, it will not affect the display of the liquid crystal display panel.

In addition, the first sub-backlight module can be controlled by the high-level signal of the pulse width modulation signal to emit light after a period of time after the liquid crystal inversion of the corresponding row of pixels is completed, as shown in FIGS. 5 and 6. The first sub-backlight module can also be controlled by the high-level signal of the pulse width modulation signal to emit light as soon as possible after the liquid crystal inversion of the row of pixels corresponding to the first sub-backlight module is completed, as shown in FIG. 7, where the first sub-backlight The pulse width modulation signal corresponding to the module is the N1" signal, the pulse width modulation signal corresponding to the second sub-backlight module is the N2" signal, and the pulse width modulation signal corresponding to the third sub-backlight module is the N3" signal.

It should be noted that in some embodiments of the present disclosure, the sub-backlight modules in the spliced backlight module are the same, that is, the spliced backlight module may be composed of multiple sub-backlight modules with the same structure arranged in sequence. Correspondingly, the pulse width modulation signals used to control the light emission of each sub-backlight module in the spliced backlight module can have the same duty cycle, that is, the pulse width of each pulse width modulation signal in each cycle is the same . In this way, when each pulse width modulation signal is used to control the corresponding sub-backlight module to emit light, each sub-backlight module can have the same light-emitting duration. Therefore, when the sub-backlight modules are sequentially controlled to emit light, the uniform transition of the pixel display images corresponding to the rows of the different sub-backlight modules in the liquid crystal display panel can be realized, which is beneficial to improve the display quality of the frame images.

The above-mentioned display driving method and backlight driving method can be applied to a head-mounted display device to improve the refresh frequency of the head-mounted display device and its light output brightness and use stability within each frame time. 8 and 9, the liquid crystal display panel 1 in the head-mounted display device generally includes a left sub-screen L for viewing by the user's left eye, and a right sub-screen R for viewing by the user's right eye. The splicing backlight module 2 provides backlight to the LCD panel 1. According to the number of sub-screens in the liquid crystal display panel 1, two sub-backlight modules can be used, that is, the splicing backlight module 2 includes a left backlight corresponding to the left sub-screen L The module 21 and the right backlight module 22 corresponding to the right sub-screen R. The backlight module 21 and the left and right backlight module 22 shown in Figure 8 in a row, wherein the backlight module 21 and the left sub screen left in each row of pixels L P _L corresponds to each row of the left screen sub-pixel L P _L backlight; each row of pixels 22 and the right sub-screen R, P _R of the backlight module corresponding to the right, to the right of each row of pixels R P _R of the sub-panel for backlighting.

As shown in FIG. 8, the driving method of the above display includes:

Step S1 ', according to the frame period of the scanning signal of the current frame, sequentially driving the liquid crystal pixels of each row left L and right sub-panels corresponding to the R sub-panel (P _L and P _R) is flipped.

Step S2 ', when the left sub screen L corresponding to each row of the pixels P _L crystal inversion is completed, the right sub-screen R corresponding to each row of pixels P _R liquid crystal starts to turn, controls the left backlight module 21 to emit light, the left sub-screen in the current frame The left eye image of the current frame is displayed within time.

The completion of the above-mentioned liquid crystal inversion of each row of pixels means that the liquid crystal molecules of each row of pixels are in a stable state, and it takes a certain time for the liquid crystal of each row of pixels to start to invert to stabilize inversion.

Step S3 ', when the right sub screen corresponding to the row of pixels R P _R flip liquid crystal is completed, the next frame period of the received signal frame scan, the left backlight control module 21 stops emitting light.

In the current frame period, if the right sub screen corresponding to the rows of pixels R P _R have been turned over to complete the liquid crystal, then it indicates that the current frame period has ended, you may receive a frame scanning signal of the next frame period, directly to the next frame period .

Step S4 ', after the left backlight module 21 stops emitting light, drives the left sub screen corresponding to each row of the pixels L P _L starts to turn the liquid crystal, and a backlight control for the right light emitting module 22, the right sub-screen displays the current R in the next time frame The right eye of the frame.

Based on the above-mentioned display driving method, the backlight driving method of the spliced backlight module 2 includes:

When the liquid crystal inversion of the pixel corresponding to the left sub-screen L is completed, and the liquid crystal of the pixel corresponding to the right sub-screen R starts to invert, the left backlight module 21 is controlled to emit light, so that the left sub-screen L displays the left sub-screen of the current frame in the current frame period. Eye picture

When the liquid crystal inversion of the pixel corresponding to the right sub-screen R is completed, the left backlight module 21 is controlled to stop emitting light; before the liquid crystal of the pixel corresponding to the left sub-screen L starts to invert, the right backlight module 22 is controlled to emit light, so that the right sub-screen R displays the right eye image of the current frame in the next frame period.

According to the light-emitting sequence of the left backlight module and the right backlight module, it is repeated to form a continuous screen display.

The embodiments of the present disclosure use the aforementioned display driving method and backlight driving method to provide backlight to the liquid crystal display panel 1 of the head-mounted display device, which can effectively shorten the duration of each frame period and increase the refresh frequency of the head-mounted display device. Moreover, the light-emitting duration of the left backlight module 21 and the right backlight module 22 in the spliced backlight module 2 can last until the corresponding pixels in the next frame period after the liquid crystal inversion of the corresponding pixels in the current frame period is completed. Before the liquid crystal is turned over, the left backlight module 21 and the right backlight module 22 have a longer light-emitting time, thereby effectively improving the brightness of the spliced backlight module 2, thereby avoiding increasing the brightness of the light source working current. It can prevent a series of problems such as heat generation, increased power consumption, and film wrinkles, and is beneficial to improve the brightness and use stability of the spliced backlight module and the head-mounted display device in each frame period.

It should be supplemented that, in the above head-mounted display device, the left backlight module 21 and the right backlight module 22 of the spliced backlight module 2 are independently controlled to emit light, and the left backlight module 21 and the right backlight module 22 respectively pass through corresponding Pulse width modulation (Pulse Width Modulation, referred to as PWM) signal control.

In some embodiments of the present disclosure, optionally, the timing control diagram of the left backlight module 21 and the right backlight module 22 is shown in FIG. 10.

Among them, the frame scan signal is shown as the TE signal in Figure 10, its period is T, and the duty cycle is a%. The time t ₀₁ , t ₀₂ and t ₄ shown are the time corresponding to the falling edge of the TE signal, and the diagram t ₁ time for TE signal at the midpoint of one frame cycle time T, time t ₃ illustrates a timing corresponding to a rising edge signal TE. In the frame period T of the frame scan signal TE, when the frame scan signal TE is low, the liquid crystal display panel starts to charge, and the liquid crystal of the pixels in the liquid crystal display panel starts to flip; when the frame scan signal TE is high, the liquid crystal display panel stops charging , The liquid crystal of the pixel in the liquid crystal display panel stops turning. It should be noted that when the level of the frame scan signal TE changes, the liquid crystals of the pixels in the liquid crystal display panel will not act immediately, but require a certain time difference to act accordingly. This time difference is generally called the liquid crystal response time.

The pulse width modulation signal corresponding to the left backlight module 21 is shown as the L signal in FIG. 10, and its period is T and the duty cycle is b%. The pulse width modulation signal corresponding to the right backlight module 22 is shown as the R signal in FIG. 7, and its period is T and the duty ratio is b%. Based on the periodic cycles of the above-mentioned pulse width modulation signals, the embodiment of the present disclosure only exemplarily describes the cycle shown in FIG. 10.

Referring to FIG. 10, time t _{1 and} time t _{6 are} shown as the latest time when the right backlight module 22 stops emitting light, and also when the liquid crystal of the pixel corresponding to the right backlight module 22 starts to turn over. Time t _{2 in the} figure is the time when the liquid crystal inversion of the pixel corresponding to the left backlight module 21 is completed, and the time between time t _{1 and} time t _{2 in the} figure is the liquid crystal response time of the liquid crystal of the pixel corresponding to the left backlight module 21.

Time t _01, time t _{02, and} time t _{4 in the} figure are the latest time when the left backlight module 21 stops emitting light, and it is also the time when the liquid crystal of the pixel corresponding to the left backlight module 21 starts to turn over. Time t _{5 in the} figure is the time when the liquid crystal inversion of the pixel corresponding to the right backlight module 22 is completed, and the time from time t _{4 to} time t _{5 in the} figure is the liquid crystal response time of the liquid crystal of the pixel corresponding to the right backlight module 22.

The time t _L at which the high-level signal in the pulse width modulation signal used to control the left backlight module 21 appears is between time t ₂ and t ₄ in the figure, that is, the left backlight module 21 can be at time t ₂ in the figure. and a time period between time t ₄ to emit light.

The time t _R at which the high-level signal in the pulse width modulation signal used to control the right backlight module 22 appears is located between time t _{5 and} time t ₆ in the figure, that is, the right backlight module 22 can be at time t ₅ in the figure. and a time period between time t ₆ of the light emission.

Please continue to refer to FIG. 10, within a frame period T, the initial time t ₀₁ , t ₀₂ or t ₄ at which the corresponding frame scan signal starts to be received is used to control the pulse of the pulse width modulation signal of the left backlight module 21 The time length Δt ₁ between the starting time and the initial time (for example, t ₀₁ ) can be calculated using the following formula:

Δt1=T×(1-b%).

Among them, T is the period of the frame scan signal, and b is the duty ratio of the pulse width modulation signal corresponding to the left backlight module 21.

That is, the latest time allowed to appear for the pulse of the pulse width modulation signal used to control the left backlight module 21 is the time Δt ₁ after the initial time (for example, t ₀₁ ).

Please continue to refer to FIG. 10, within a frame period T, with the time t ₀₁ , t ₀₂ or t ₄ starting to receive the corresponding frame scan signal as the initial time, it is used to control the pulse of the pulse width modulation signal of the right backlight module 22 The time length Δt ₂ between the start time and the initial time (for example, t ₀₁ ) can be calculated by using the following formula:

Δt2=T×[(1-a%)/2-b%].

Where T is the period of the frame scan signal, a is the duty ratio of the frame scan signal, and b is the duty ratio of the pulse width modulation signal corresponding to the left backlight module 21.

That is, for controlling the pulse width modulation signal of the right backlight module 22, the latest time the pulse of the pulse width modulation signal is allowed to appear is the time Δt ₂ after the initial time (for example, t ₀₁ ).

The embodiment of the present disclosure uses the above formula to obtain the start time of the latest pulse corresponding to the pulse width modulation signal, which can effectively balance the light-emitting duration of each sub-backlight module (ie, the left backlight module and the right backlight module) with the frame scan signal and pulse width The corresponding relationship between the modulation signals is optimized to optimize the light output brightness of the left backlight module 21 and the right backlight module 22, or effectively obtain the light output brightness of the backlight module that can meet actual needs.

As shown in FIG. 11, an embodiment of the present disclosure also provides a display driving device 200 for driving a display including a liquid crystal display panel 1 and a splicing backlight module 2. The driving device 200 of the display includes a frame scan synchronization circuit 31, a display driving circuit 32 and a backlight driving circuit 33.

Among them, the frame scan synchronization circuit 31 is configured to receive frame scan signals of each frame period. The frame scan signal is used as the frame display control signal of the liquid crystal display panel 1. When the current frame needs to be displayed, the control board of the liquid crystal display panel 1 sends the current frame scan signal corresponding to the current frame period to the frame scan synchronization circuit 31; In the next frame, the control motherboard of the liquid crystal display panel 1 sends the next frame scan signal corresponding to the next frame period to the frame scan synchronization circuit 31.

The display driving circuit 32 is coupled to the frame scanning synchronization circuit 31; the display driving circuit 32 is configured to drive the liquid crystal of each row of pixels in the liquid crystal display panel 1 to reverse row by row starting from the first row according to the frame scanning signal of each frame period.

The backlight driving circuit 33 is coupled to the display driving circuit 32 and the splicing backlight module 2; the backlight driving circuit 33 is configured to periodically and cyclically control each sub-backlight module according to the sequence in which at least two sub-backlight modules included in the splicing backlight module 2 are arranged. The sub-backlight module emits light; and the start time of making each sub-backlight module emit light, after the liquid crystal of each row of pixels corresponding to the sub-backlight module is flipped in the current frame period; the end time of making each sub-backlight module emit light, The liquid crystal of each row of pixels corresponding to the sub-backlight module is reversed before the next frame period.

When the driving device 200 of the above-mentioned display is in use, its driving method is the same as the driving method of the display mentioned in the foregoing embodiment, so it will not be detailed here. The beneficial effects that can be achieved by the display driving device 200 provided by the embodiments of the present disclosure are the same as the beneficial effects that can be achieved by the display driving method provided in the foregoing embodiments, and will not be described in detail here.

Optionally, the frame scan synchronization circuit 31 and the display driving circuit 32 are integrated, for example, integrated in the same driving chip, which is beneficial to improve the frame response speed of the display driving circuit 32. Of course, the frame scan synchronization circuit 31 and the display drive circuit 32 can also be integrated with the backlight drive circuit 33. For example, the three are integrated on the same circuit board, thereby simplifying and compacting the structure of the display drive device 200, thereby reducing the display cost. The drive device 200 takes up space in the display device.

Based on the above-mentioned display driving device 200, as shown in FIG. 12, some embodiments of the present disclosure provide a backlight driving circuit 33 for driving the spliced backlight module 2 to emit light.

Wherein, the spliced backlight module 2 includes N sub-backlight modules 20 arranged in sequence along the column direction, N≧2, and each sub-backlight module 20 corresponds to at least one row of pixels in the liquid crystal display panel. For the function of the backlight driving circuit 33, please refer to the related description of the backlight driving circuit 33 in the above-mentioned display driving device 200, which will not be repeated here.

When the above-mentioned backlight driving circuit 33 is in use, its backlight driving method is the same as the backlight driving method mentioned in the foregoing embodiment, so it will not be described in detail here. The beneficial effects that can be achieved by the backlight driving circuit 33 provided by the embodiments of the present disclosure are the same as the beneficial effects that can be achieved by the backlight driving method provided by the foregoing embodiments.

It can be understood that the above-mentioned backlight driving circuit 33 is used to drive each sub-backlight module 20 in the spliced backlight module 2 to independently emit light, and the backlight driving circuit 33 may adopt a structure of a driving chip or a driving circuit. Of course, it is not limited to this, and other structures that can achieve the above functions are applicable.

Exemplarily, the backlight driving circuit 33 includes N pulse width modulation sub-circuits 330 connected to each sub-backlight module 20 in a one-to-one correspondence. Wherein, each pulse width modulation sub-circuit 330 is configured to transmit a pulse width modulation signal to the sub-backlight module 20 coupled to the pulse-width modulation sub-circuit 330 to control the sub-backlight module 20 to emit light.

In some embodiments, the spliced backlight module 2 can be composed of a plurality of sub-backlight modules 20 with the same structure arranged in sequence; correspondingly, each pulse width modulation sub-circuit 330 used to control the light-emitting state of the sub-backlight module 20 is output The pulse width modulated signal can have the same duty cycle. In this way, when the pulse-width modulation sub-circuits 330 are used to drive the coupled sub-backlight modules 20 to emit light, each of the sub-backlight modules 20 can have the same light-emitting duration. Thus, when the sub-backlight modules 20 are sequentially controlled to emit light, the uniform transition of the display images of the rows of pixels corresponding to the different sub-backlight modules 20 in the liquid crystal display panel can be realized, which is beneficial to improve the frame image display quality.

As shown in FIG. 11, an embodiment of the present disclosure also provides a display device 100. The display device 100 includes: a liquid crystal display panel 1, a non-display surface (the side opposite to the display surface) of the liquid crystal display panel. The splicing backlight module 2 and the display driving device 200 coupled with the liquid crystal display panel 1 and the splicing backlight module 2. Wherein, the driving device 200 of the display is the driving device of the display as described in some of the above embodiments.

The beneficial effects that can be achieved by the above-mentioned display device 100 are the same as the beneficial effects that can be achieved by the display driving device 200 in the above-mentioned embodiment, and will not be repeated here.

The display device 100 provided in the foregoing embodiment may be a product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, or a navigator.

In some embodiments, the driving device 200 for the display can be implemented using electronic hardware, computer software, or a combination of the two.

For hardware implementation, the implementation described herein can be implemented by using application-specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays ( FPGA), a processor, a controller, a microcontroller, a microprocessor, and an electronic unit designed to perform the functions described herein are implemented. In some cases, such an implementation may be implemented in a processor unit.

For software implementation, implementations such as procedures or functions may be implemented with a separate software module that allows execution of at least one function or operation. The software code can be implemented by a software application (or program) written in any appropriate programming language, and the software code can be stored in a memory and executed by a processor unit.

Some embodiments of the present disclosure provide a computer-readable storage medium (for example, a non-transitory computer-readable storage medium) in which computer program instructions are stored, and when the computer program instructions run on a processor , Can realize one or more steps in the backlight driving method described in some of the above embodiments, or one or more steps in the display driving method described in some of the above embodiments.

Exemplarily, the foregoing computer-readable storage medium may include, but is not limited to: magnetic storage devices (for example, hard disks, floppy disks, or tapes, etc.), optical disks (for example, CD (Compact Disk), DVD (Digital Versatile Disk, digital Universal Disk), etc.), smart cards and flash memory devices (for example, EPROM (Erasable Programmable Read-Only Memory), cards, sticks or key drives, etc.). The various computer-readable storage media described in this disclosure may represent one or more devices and/or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who thinks of changes or substitutions within the technical scope disclosed in the present disclosure shall cover Within the protection scope of this disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims (16)

1. A backlight driving method, the backlight driving method is used to drive the spliced backlight module to emit light;

   The splicing backlight module includes at least two sub-backlight modules arranged in sequence along the column direction, each sub-backlight module extends in the row direction, and each of the sub-backlight modules corresponds to at least one row of pixels in the liquid crystal display panel;

   The backlight driving method includes:

   According to the sequence in which the at least two sub-backlight modules are arranged, periodically and cyclically control the light emission of each sub-backlight module;

   The light-emitting time of each sub-backlight module starts after the liquid crystal of each row of pixels corresponding to the sub-backlight module has been turned over in the current frame period;

   At the end of the light emission of each sub-backlight module, the liquid crystal of each row of pixels corresponding to the sub-backlight module is reversed in the next frame period.
2. 4. The backlight driving method of claim 1, wherein the at least two sub-backlight modules are controlled by at least two pulse width modulation signals respectively;

   During each periodical cycle control of the at least two sub-backlight modules, the pulses in each pulse width modulation signal for controlling the corresponding sub-backlight modules to emit light are sequentially formed in the order in which the corresponding sub-backlight modules are arranged.
3. 4. The backlight driving method according to claim 2, wherein the duty ratios of the pulse width modulation signals are the same.
4. The backlight driving method according to any one of claims 1 to 3, wherein:

   The liquid crystal display panel includes a left sub-screen for viewing by the user's left eye, and a right sub-screen for viewing by the user's right eye;

   The splicing backlight module includes a left backlight module corresponding to the left sub-screen, and a right backlight module corresponding to the right sub-screen;

   The backlight driving method includes:

   When the liquid crystal inversion of the pixel corresponding to the left sub-screen is completed and the liquid crystal of the pixel corresponding to the right sub-screen starts to invert, the left backlight module is controlled to emit light, so that the left sub-screen displays in the current frame period The left eye image of the current frame;

   When the liquid crystal inversion of the pixel corresponding to the right sub-screen is completed, the left backlight module is controlled to stop emitting light; before the liquid crystal of the pixel corresponding to the left sub-screen starts to invert, the right backlight module is controlled to emit light to Make the right sub-screen display the right-eye picture of the current frame in the next frame period.
5. The backlight driving method according to claim 4, wherein:

   The duration of each frame period is T;

   In each frame period, the duty ratio of the frame scan signal used to drive each pixel row of the left sub-screen and the right sub-screen inverted within the frame period is a%;

   The duty cycle of the pulse width modulation signal used to control the left backlight module and the right backlight module are both b%;

   In a frame period, the time at which the frame scanning signal of the frame period starts to be received is the initial time, which is used to control the length of time between the start time of the pulse of the pulse width modulation signal of the left backlight module and the initial time Δt _{1 is} less than or equal to T×(1-b%);

   The time length Δt ₂ between the start time of the pulse of the pulse width modulation signal for controlling the right backlight module and the initial time is less than or equal to T×[(1-a%)/2-b%].
6. 5. The backlight driving method according to any one of claims 1 to 5, wherein the light-emitting periods of the sub-backlight modules included in the spliced backlight module do not overlap with each other.
7. 5. The backlight driving method according to any one of claims 1 to 5, wherein among the sub-backlight modules included in the spliced backlight module, at least two sub-backlight modules have overlapping light-emitting periods.
8. A backlight driving circuit for driving the splicing backlight module to emit light;

   The splicing backlight module includes at least two sub-backlight modules arranged in sequence along the column direction, each sub-backlight module extends in the row direction, and each of the sub-backlight modules corresponds to at least one row of pixels in the liquid crystal display panel;

   The backlight drive circuit is configured to periodically and cyclically control the light emission of each sub-backlight module according to the order in which the at least two sub-backlight modules are arranged; After the liquid crystal of each row of pixels corresponding to the sub-backlight module is reversed in the current frame period; the end time of making each sub-backlight module emit light is before the liquid crystal of each row of pixels corresponding to the sub-backlight module is reversed in the next frame period .
9. 8. The backlight driving circuit according to claim 8, wherein the backlight driving circuit comprises at least two pulse width modulation sub-circuits, and the at least two pulse width modulation sub-circuits are respectively coupled to the at least two sub-backlight modules;

   Each pulse width modulation sub-circuit is configured to transmit a pulse width modulation signal to the sub-backlight module coupled to the pulse width modulation sub-circuit to control the sub-backlight module to emit light.
10. 10. The backlight driving circuit of claim 9, wherein the pulse width modulation signals transmitted by the pulse width modulation sub-circuits have the same duty cycle.
11. A display driving method, which is used to drive a display including a liquid crystal display panel and a splicing backlight module;

    Wherein, the splicing backlight module includes at least two sub-backlight modules arranged in sequence along the column direction, each sub-backlight module extends in the row direction, and each of the sub-backlight modules and at least one row of pixels in the liquid crystal display panel correspond;

    The driving method includes:

    Inputting a frame scan signal of the current frame period to the liquid crystal display panel, and driving each row of pixels of the liquid crystal display panel to start to flip line by line;

    After the liquid crystal inversion of each row of pixels corresponding to the first sub-backlight module is completed, control the first sub-backlight module to start emitting light;

    According to the sequence of the arrangement of the at least two sub-backlight modules, after the liquid crystal inversion of each row of pixels corresponding to the i-th sub-backlight module is completed, the i-th sub-backlight module is controlled to start emitting light; where i starts from [2, N] Take values in the set in sequence, N is a positive integer greater than or equal to 2, and N is the number of sub-backlight modules included in the spliced backlight module;

    After the liquid crystal inversion of the last row of pixels of the liquid crystal display panel is completed, receiving the frame scan signal of the next frame period;

    Controlling the first sub-backlight module to stop emitting light before each row of pixels of the liquid crystal display panel starts to flip line by line under the drive of the frame scan signal of the next frame period;

    According to the arrangement sequence of the at least two sub-backlight modules, the i-th sub-backlight module is controlled to stop emitting light before the liquid crystal of each row of pixels corresponding to the i-th sub-backlight module starts to flip under the driving of the frame scanning signal of the next frame period .
12. A display driving device for driving a display including a liquid crystal display panel and a splicing backlight module;

    The driving device includes:

    Frame scan synchronization circuit; the frame scan synchronization circuit is configured to receive frame scan signals of each frame period;

    A display drive circuit coupled to the frame scan synchronization circuit; the display drive circuit is configured to drive the liquid crystal of each row of pixels in the liquid crystal display panel to start to flip line by line according to the frame scan signal of each frame period;

    A backlight driving circuit coupled to the display driving circuit and the splicing backlight module; the backlight driving circuit is configured to arrange the at least two sub-backlight modules included in the splicing backlight module, periodically Control each sub-backlight module to emit light; and make each sub-backlight module start to emit light after the liquid crystal of each row of pixels corresponding to the sub-backlight module is flipped in the current frame period; make each When the sub-backlight module emits light, before the liquid crystal of each row of pixels corresponding to the sub-backlight module is reversed in the next frame period.
13. The driving device of the display according to claim 12, wherein the frame scan synchronization circuit and the display driving circuit are integrated.
14. 11. The driving device of the display according to claim 12, wherein the frame scan synchronization circuit, the display driving circuit and the backlight driving circuit are integrated.
15. A display device, the display device comprising:

    LCD panel;

    A spliced backlight module arranged on the non-display surface side of the liquid crystal display panel; the spliced backlight module includes at least two sub-backlight modules arranged in sequence along the column direction, each sub-backlight module extending in the row direction, and Each of the sub-backlight modules corresponds to at least one row of pixels in the liquid crystal display panel; and,

    A driving device for a display coupled to the liquid crystal display panel and the splicing backlight module, the driving device being the driving device according to any one of claims 12-14.
16. A computer-readable storage medium storing computer program instructions, which when executed by a processor, can implement one or more steps in the backlight driving method according to any one of claims 1 to 7 .

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