Patent Grant
11410616
This application is the National Stage of PCT/CN2017/112146 filed on Nov. 21, 2017, which claims priority under 35 U.S.C. § 119 of Chinese Application No. 201710386831.0 filed on May 26, 2017, the disclosure of which is incorporated by reference.
Embodiments of the present disclosure relate to a backlight driving method and device of a display panel, and a display panel.
A Virtual Reality (VR) product refers to a product developed based on a virtual reality technology, for example, a VR head-mounted display. The virtual reality technology is a computer simulation technology that can create a virtual world and make an user to experience the virtual world, and use a computer to generate a simulation environment, which is a systematic simulation of multi-source information fusion of interactive three-dimensional dynamic view and physical behavior, so that users are immersed in the environment.
Virtual reality applications bring a strong sense of immersion; in most virtual reality scenes (such as game scenes), users can control characters they play to move freely, movement of the characters makes movement of a lens, and a relative position of a virtual reality content will also change when the lens moves. However, due to visual persistence of human eyes, images of a previous frame and a current frame will be retained by the human eyes, bringing a smear effect on the image in a liquid crystal display (LCD), and resulting in sensory conflict-caused vertigo.
In a related art, the vertigo is relieved mainly by controlling pixels within each frame of the liquid crystal display (LCD) to emit light within a very short time period. However, in the above-described mode, backlight is always in an ON-state when the image is displayed; during line scan and liquid crystal response inverting, a state of line scan and liquid crystal response inverting is easily felt by the human eyes, which makes a displayed motion image blurred on the one hand, and brings discomfort to the eyes on the other hand, thus affecting users' experience.
Embodiments of the present disclosure provide a backlight driving method and device of a display panel, and a display panel.
In a first aspect, an embodiment of the present disclosure provides a backlight driving method, the backlight driving method comprises steps of: generating a synchronous drive frame and performing black frame insertion control according to the synchronous drive frame, the synchronous drive frame comprises a first time region and a second time region, in the synchronous drive frame, a PWM light-adjusting signal is not output in the first time region and the PWM light-adjusting signal is output in the second time region, the first time region corresponds to line scan time, and the second time region corresponds to liquid crystal stabilization time.
Alternatively, the generating the synchronous drive frame further includes acquiring the PWM light-adjusting signal.
Alternatively, the acquiring the PWM light-adjusting signal includes acquiring the PWM light-adjusting signal from a liquid crystal driver chip, and the generating the synchronous drive frame further includes acquiring the liquid crystal stabilization time and the line scan time from the liquid crystal driver chip.
Alternatively, the acquiring the PWM light-adjusting signal includes acquiring the PWM light-adjusting signal from a microprocessor, and the generating a synchronous drive frame further includes acquiring the liquid crystal stabilization time and the line scan time from the liquid crystal driver chip.
Alternatively, the generating the synchronous drive frame according to the PWM light-adjusting signal and the backlight modulation control signal includes associating the PWM light-adjusting signal with the backlight modulation control signal by a logic relationship “AND”, to generate the synchronous drive frame.
Alternatively, a frequency of the synchronous drive frame is consistent with a display frequency of the display panel.
In a second aspect, an embodiment of the present disclosure provides a backlight driving device of a display panel, the backlight driving device of a display panel comprises: a first module, configured to output a PWM light-adjusting signal and a backlight modulation control signal, wherein, the backlight modulation control signal includes a first time region and a second time region, and the backlight modulation control signal is active in the second time region; a synchronous drive frame generating module, configured to generate a synchronous drive frame according to the PWM light-adjusting signal and the backlight modulation control signal, wherein, the synchronous drive frame comprises the first time region and the second time region therein; in the synchronous drive frame, the PWM light-adjusting signal is not output in the first time region, and the PWM light-adjusting signal is output in the second time region; the first time region corresponds to line scan time, and the second time region corresponds to liquid crystal stabilization time; and a backlight driver chip, configured to perform black frame insertion control according to the synchronous drive frame.
Alternatively, the first module is a liquid crystal driver chip.
Alternatively, the first module is configured to acquire the PWM light-adjusting signal and the backlight modulation control signal from the liquid crystal driver chip and then output the PWM light-adjusting signal and the backlight modulation control signal.
Alternatively, the first module is configured to acquire the PWM light-adjusting signal from a microprocessor and acquire the backlight modulation control signal from the liquid crystal driver chip and then output the PWM light-adjusting signal and the backlight modulation control signal.
Alternatively, the synchronous drive frame generating module is an AND gate.
Alternatively, a frequency of the synchronous drive frame is consistent with a display frequency of the display panel.
In a third aspect, an embodiment of the present disclosure provides a display panel, the display panel includes: the backlight driving device of a display panel according to the second aspect of the present disclosure; a backlight, configured to be driven by the backlight driving device; and a display screen, configured to display an image.
In order to clearly illustrate the technical solution of the embodiments of the invention, the drawings of the embodiments will be briefly described in the following; it is obvious that the described drawings are only related to some embodiments of the invention and thus are not limitative of the invention.
Embodiments of the present disclosure will be in detail described hereinafter, and examples of the embodiments am shown in the drawings, in which the same or similar reference number is denoted as the same or similar members or the members with the same or similar function throughout. The described embodiments in conjunction with the accompanying drawings of the present disclosure are exemplary, only is used to explain the present disclosure and do not intend to limit the present disclosure.
Hereinafter, a backlight driving method and device of a display panel, and a display panel according to the embodiments of the present disclosure are described with reference to the accompanying drawings.
As shown in
S11: generating a synchronous drive frame.
Wherein, the synchronous drive frame has a first time region and a second time region, the synchronous drive frame does not have a Pulse Width Modulation (PWM) light-adjusting signal output in the first time region, and has the PWM light-adjusting signal output in the second time region.
In the VR product, a display process of the display panel may be generally divided into several time periods, and a VR display process is usually divided into line scan time, liquid crystal response time and liquid crystal stabilization time. In order to implement backlight control of the display panel, in this embodiment, the first time region of the synchronous drive frame corresponds to the line scan time, and the second time region corresponds to the liquid crystal stabilization time.
Here, it should be noted that the line scan time is a sum of scan time of all lines of one frame; usually, the liquid crystal response time is shorter than the liquid crystal stabilization time, and the liquid crystal response time overlaps with the line scan time.
Wherein, the line scan time is related to a scanning capability of a liquid crystal driver chip in the display panel, that is, the line scan time is limited by the scanning capability of the liquid crystal driver chip in the display panel, usually, the stronger the scanning capability of the liquid crystal driver chip, the shorter the line scan time required.
Wherein, it should be noted that, in one embodiment of the present disclosure, a frequency of a synchronous drive frame is consistent with a display frequency of a display panel.
Wherein, the display frequency of the display panel refers to the number of times the image on the display panel appears every second, the higher the display frequency of the display panel, the weaker the flicker sense of the image on the display panel, the better the stability, and the stronger the protection of vision.
In one embodiment of the present disclosure, in order to improve a response speed of a display panel, a display frequency of the display panel according to this embodiment is a frequency greater than or equal to a preset frequency threshold.
Wherein, the preset frequency threshold is set in advance, for example, the preset frequency threshold may be 90 Hz.
Wherein, it should be understood that display frequencies corresponding to different display panels are different, and the display frequency of the display panel is preset and standardized by a device manufacturer of the display panel.
In one embodiment of the present disclosure, a process of generating a synchronous drive frame, as shown in
S21: generating a backlight modulation control signal according to liquid crystal stabilization time and line scan time.
Wherein, the backlight modulation control signal includes a first time region and a second time region, and the backlight modulation control signal is active in the second time region.
Wherein, it may be determined through the above description that, the first time region corresponds to the line scan time, and the second time region corresponds to the liquid crystal stabilization time, that is to say, the backlight modulation control signal is active only in the liquid crystal stabilization time, that is, backlight of a display panel is in an OFF-state within the line scan time, and the backlight is in an ON-state within the liquid crystal stabilization time.
As an exemplary implementation mode, in order that average brightness of a liquid crystal display module after backlight modulation satisfies requirements of human eyes, a ratio of the second time region may be set above a preset percentage.
Wherein, the preset percentage is set in advance, for example, the preset percentage may be 10%.
Exemplarily, if a display frequency of the display panel is 90 Hz, then average time per frame is 11.1 ms; in order that the average brightness of the liquid crystal display module after backlight modulation satisfies the requirements of the human eyes, the second time region may be set above 10%, that is, time for the ON-state of the backlight is set above 10%, at which time, the liquid crystal display time in a liquid crystal driver chip needs to be controlled within 9 ms.
As an exemplary implementation mode, in order to set the ratio of the second time region above the preset percentage, that is, in order to control the liquid crystal display time within a preset time, the display panel may be controlled in a video mode, then, an OSCillator (OSC) of the liquid crystal driver chip is overclocked, and Vertical Back Porch (VBP) and Vertical Front Porch (VFP) are adjusted to compress display scan time, so that the liquid crystal display time may be controlled within the preset time.
Wherein, the VBP refers to the number of invalid lines at beginning of a frame after a vertical synchronization cycle. VFP refers to the number of invalid lines from ending of current frame data output to beginning of a vertical synchronization cycle of a next frame.
S22: generating a synchronous drive frame according to the PWM light-adjusting signal and the backlight modulation control signal acquired.
Alternatively, the generating a synchronous drive frame may further include: acquiring the PWM light-adjusting signal; for example, the PWM light-adjusting signal may be acquired from the liquid crystal driver chip, or may be obtained from a microprocessor of a mobile phone, a tablet, or the like, as long as the PWM light-adjusting signal can be acquired, which will not be limited in the embodiment of the present disclosure.
For example, the acquiring the PWM light-adjusting signal may include: acquiring the PWM light-adjusting signal from the liquid crystal driver chip; and the generating a synchronous drive frame may further include: acquiring the liquid crystal stabilization time and the line scan time from the liquid crystal driver chip.
Alternatively, the acquiring the PWM light-adjusting signal may include: acquiring the PWM light-adjusting signal from a microprocessor; and the generating a synchronous drive frame may further include: acquiring the liquid crystal stabilization time and the line scan time from the liquid crystal driver chip.
In one embodiment of the present disclosure, in order that a synchronous drive frame has a backlight control function and a brightness adjustment function, and that the synchronous drive frame and the liquid crystal driver chip are synchronized in periodic driving control, that is, the synchronous drive frame drives and stops a backlight operation at a specific time of each frame, after the backlight modulation control signal and the PWM light-adjusting signal are acquired, the PWM light-adjusting signal and the backlight modulation control signal may be associated with each other by a logic relationship “AND”, to generate the synchronous drive frame.
Exemplarily, it is assumed that the acquired PWM light-adjusting signal is as shown in
S12: performing black frame insertion control according to the synchronous drive frame.
In one embodiment of the present disclosure, a synchronous drive frame controls backlight to stop operation at a specific time, for example, in a first time region, to implement a black frame insertion operation, and controls the backlight to be lit in a second time region, so as to implement a black frame insertion operation of entire display.
Moreover, in this embodiment, the OFF-state of the backlight, that is, a time period corresponding to black frame insertion is the same as the first time region, that is, the time period corresponding to black frame insertion corresponds to line scan time.
Wherein, it should be noted that, for convenience of description, the time period corresponding to black frame insertion is simply referred to as black frame insertion time.
Exemplarily, an exemplary diagram of the line scan time, the liquid crystal response time and the liquid crystal stabilization time, the backlight modulation control signal, and the black frame insertion time of the display that are known to the inventor(s) is as shown in
In summary, it can be seen that, in this embodiment, in the process of performing black frame insertion according to the synchronous drive frame, the PWM light-adjusting signal is controlled to be output within the liquid crystal stabilization time, to turn-on the backlight, complete display, and implement a backlight black frame insertion function within the frame; and at a same time, brightness of the liquid crystal within the liquid crystal stabilization time is controlled, so that on the one hand, the inverting state of the liquid crystal is not felt by the human eyes, to mitigate discomfort that the liquid crystal display module brings to the eyes, and on the other hand, a trajectory of a motion image displayed by the display panel may be more realistic, to improve clarity of the motion image.
In the backlight driving method of the display panel according to the embodiment of the present disclosure, the synchronous drive frame controls not to output the PWM light-adjusting signal within the line scan time, and to output the PWM light-adjusting signal within the liquid crystal stabilization time, and black frame insertion control is performed according to the synchronous drive frame, so that the inverting state of the liquid crystal is not felt by the human eyes, to mitigate discomfort that the liquid crystal display module brings to the eyes, and at a same time, the trajectory of the motion image displayed by the display panel may be more realistic, to improve clarity of the motion image.
In order to implement the above-described embodiment, the present disclosure further proposes a backlight driving device of a display panel.
As shown in
The first module 100 is configured to output a PWM light-adjusting signal and a backlight modulation control signal.
Alternatively, the first module 100 may acquire a PWM light-adjusting signal, and then output the same. For example, the first module 100 may acquire a PWM light-adjusting signal from a liquid crystal driver chip, or may acquire from a mobile phone, a tablet personal computer, or a microprocessor of other VR device, as long as the PWM light-adjusting signal can be acquired, which will not be limited in the embodiment of the present disclosure. Moreover, the first module 100 may further acquire line scan time, liquid crystal response time and liquid crystal stabilization time of the display panel, for example, from the liquid crystal driver chip or other components, and generate a backlight modulation control signal according to the above and output the backlight modulation control signal.
Alternatively, the first module 100 itself may provide a PWM light-adjusting signal and then output the PWM light-adjusting signal. In this case, the first module 100 may be a liquid crystal driver chip that can provide the PWM light-adjusting signal, and the first module 100 may provide the line scan time, the liquid crystal response time and the liquid crystal stabilization time, and generate a backlight modulation signal according to the line scan time, the liquid crystal response time and the liquid crystal stabilization time provided by itself, and then output the backlight modulation signal.
Wherein, the backlight modulation control signal includes a first time region and a second time region, and the backlight modulation control signal is valid in the second time region.
The synchronous drive frame generating module 200 is configured to generate a synchronous drive frame according to the PWM light-adjusting signal and the backlight modulation control signal.
Wherein, the synchronous drive frame has a first time region and a second time region therein; and the synchronous drive frame does not have the PWM light-adjusting signal output in the first time region, and has the PWM light-adjusting signal output in the second time region.
The first time region corresponds to the line scan time, and the second time region corresponds to the liquid crystal stabilization time.
Wherein, the line scan time is related to a scanning capability of a liquid crystal driver chip in the display panel, that is, the line scan time is limited by the scanning capability of the liquid crystal driver chip in the display panel; usually, the stronger the scanning capability of the liquid crystal driver chip, the shorter the line scan time required.
The backlight driver chip 300 is configured to perform black frame insertion control according to the synchronous drive frame.
In one embodiment of the present disclosure, a synchronous drive frame generating module 200 is an AND gate.
In one embodiment of the present disclosure, a frequency of a synchronous drive frame is consistent with a display frequency of a display panel.
Wherein, it should be understood that, display frequencies corresponding to different display panels are different, and the display frequency of the display panel is preset and standardized by a device manufacturer of the display panel.
In one example, an exemplary diagram of a backlight driving device of a display panel is as shown in
Wherein, it should be noted that, the foregoing explanation of the backlight driving method of the display panel is also applicable to the backlight driving device of the display panel according to this embodiment, which will not be repeated here.
In the backlight driving device of the display panel according to the embodiment of the present disclosure, the synchronous drive frame controls not to output the PWM light-adjusting signal within the line scan time, and to output the PWM light-adjusting signal within the liquid crystal stabilization time, and black frame insertion control is performed according to the synchronous drive frame, so that an inverting state of a liquid crystal is not felt by human eyes, to mitigate discomfort that a liquid crystal display module brings to the eyes, and at a same time, a trajectory of a motion image displayed by the display panel may be more realistic, to improve clarity of the motion image.
In order to implement the above-described embodiment, the present disclosure further proposes a display panel.
The display panel comprises the backlight driving device of the display panel according to the above-described embodiment; a backlight, configured to be driven by the backlight driving device; and a display screen, configured to display an image.
In the display panel according to the embodiment of the present disclosure, a synchronous drive frame controls not to output a PWM light-adjusting signal within line scan time, and to output a PWM light-adjusting signal within liquid crystal stabilization time, and black frame insertion control is performed according to the synchronous drive frame, so that an inverting state of a liquid crystal is not felt by human eyes, to mitigate discomfort that a liquid crystal display module brings to the eyes, and at a same time, a trajectory of a motion image displayed by the display panel may be more realistic, to improve clarity of the motion image.
In the backlight driving method and device of the display panel, and the display panel according to the embodiments of the present disclosure, the synchronous drive frame controls not to output the PWM light-adjusting signal within the line scan time, and to output the PWM light-adjusting signal within the liquid crystal stabilization time, and black frame insertion control is performed according to the synchronous drive frame, so that the inverting state of the liquid crystal is not felt by the human eyes, to mitigate discomfort that the liquid crystal display module brings to the eyes, and at a same time, the trajectory of the motion image displayed by the display panel may be more realistic, to improve clarity of the motion image.
In the description, the description with referring to the terms “an embodiment”, “some embodiments”, “example”, “specific example” or “some examples” means that the specific feature, structure, material or character described with connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In the description, the schematic description of the above terms is not necessary to direct to the same embodiment or example. The described feature, structure, material or character may be combined in any suitable manner in any or a plurality of embodiments or examples. Further, in case of no conflict, different embodiments or examples and features in different embodiments or example described in the specification can be combined.
Further, the terms, such as “first,” “second,” or the like, which are used in the description and the claims of the present disclosure, are not intended to indicate or imply the relative importance or implicitly indicate the amount of the features. Thus, the features defined by “first,” “second,” may explicitly indicate or implicitly includes at least one feature. In the description of the present disclosure, Unless otherwise defined, “a plurality of” means two or more.
Any process or method illustrated in the flow charts or described herein in any other manner may be understood as including one or a plurality of modules, segments or portions of codes of executable instructions for implementing specific logic functions or steps in the processes; in addition, the scope of the preferred embodiments of the present disclosure covers other implementations, wherein, the implementation of the functions may not be subjected to the illustrated or discussed sequence; however, the functions may be implemented in a substantially simultaneous manner or in a contrary sequence according to the involved functions, which shall be understood by those skilled in the art according to the embodiments of the present disclosure.
The logic and/or step illustrated in the flow charts or described herein in any other manner, for example, may be considered as a particular sequence table of executable instructions for implementing the logic functions, and may be specifically implemented in any computer readable medium to be used by an instruction execution system, a device or an apparatus (for example, a system based on computers, a system including processors or other systems capable of obtaining the instruction from the instruction execution system, device and apparatus and executing the instruction), or to be used in combination with the instruction execution system, the device and the apparatus. As to the specification, the “computer readable medium” may be any device adaptive for including, storing, communicating, propagating or transferring programs to be used by or in combination with the instruction execution system, the device or the apparatus. More specific examples of the computer readable medium include but are not limited to: an electronic connection part (an electronic device) with one or more wires, a portable computer enclosure (a magnetic device), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or a flash memory), an optical fiber device and a portable compact disk read-only memory (CDROM). In addition, the computer readable medium may even be a paper or other appropriate medium capable of printing programs thereon, this is because, for example, the paper or other appropriate medium may be optically scanned and then edited, decrypted or processed by using other appropriate methods when necessary to obtain the programs in an electric manner, and then the programs may be stored in the computer memories.
It should be understood that, respective parts of the present disclosure may be implemented by hardware, software, firmware or a combination thereof. In the above implementation modes, a plurality of steps or methods may be implemented by software or firmware that is stored in the memory and executed by an appropriate instruction execution system. For example, if it is implemented by hardware, it may be implemented by any one of the following technologies known in the art or a combination thereof as in another implementation mode: a discrete logic circuit(s) having logic gates for implementing logic functions upon data signals, an Application Specific Integrated Circuit having appropriate combinational logic gates, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), etc.
Those ordinarily skilled in the art may understand that all or part of steps carried by the method for implementing the above-described embodiments may be completed by a relevant hardware instructed by a program. The programs may be stored in a computer readable storage medium, and the programs include any one or a combination of the steps according the method embodiments when being executed.
In addition, respective functional units in respective embodiments of the present disclosure may be integrated in a processing module, or respective unit may further exist physically alone, or two or more units may further be integrated in a module. The foregoing integrated module may be implemented either in the form of hardware or software. If the integrated module is implemented as a software functional module and is sold or used as a stand-alone product, it may also be stored in a computer readable storage medium.
The above-mentioned storage medium may be a read only memory (ROM), a magnetic disk or an optical disk, and the like. Although the embodiments of the present disclosure have been shown and described above, it should be understood that the above-described embodiments are exemplary, and it would be appreciated by those ordinarily skilled in the art that the above-described embodiments cannot be construed to limit the present disclosure, and variations, modifications, substitutions and transformations can be made in the above-described embodiments within the scope of the present disclosure.
The application claims priority to the Chinese patent application No. 201710386831.0, filed May 26, 2017, the disclosure of which is incorporated herein by reference as part of the application.
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| 201710386831.0 | May 2017 | CN | national |
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| PCT/CN2017/112146 | 11/21/2017 | WO | 00 |
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| WO2018/214429 | 11/29/2018 | WO | A |
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