Display control method, display control device and display equipment

Abstract

The invention provides a display control method, a display control device and display equipment, and relates to the field of display. The display control method comprises the following steps: performing frequency multiplication on a frame of image signal to generate at least two same frames of image signals, wherein the at least two frames of image signals comprise a first image signal and a second image signal; performing overdrive processing on the first image signal to generate a first overdrive image signal; and controlling the display panel to display the first overdrive image signal and then display the second image signal within a frame of time. According to the scheme, the display response speed and the display quality can be improved.

Description

Technical Field

[0001] The present application relates to the field of display, and more specifically, to a display control method, a display control device, and a display device. Background Art

[0002] Three-dimensional (3D) display technology converts a planar image into a dynamic scene with a sense of depth by simulating the stereoscopic vision principle of the human eye, bringing an immersive viewing experience to users. With the continuous breakthrough and innovation of 3D display, it has been widely used in various fields such as film and television entertainment, gaming, medical imaging, virtual reality, and industrial design. In an active 3D display scenario, the display screen will display a left image frame and a right image frame respectively. It is required that the response speed of the display screen is fast enough. When the left eye views, the display screen has completely switched from the right image to the left image, and the liquid crystal response has been completed; when the right eye views, the display screen has completely switched from the left image to the right image, and the liquid crystal response has been completed. In addition, 3D display also requires high display quality to meet various application requirements.

[0003] In view of this, how to balance the display response speed and the display quality is a technical problem to be solved urgently. Summary of the Invention

[0004] The present application provides a display control method, a display control device, and a display device, which can balance the improvement of the display response speed and the display quality.

[0005] In a first aspect, a display control method is provided, including: doubling the frequency of a frame of image signal to generate at least two identical image signals, where the at least two image signals include a first image signal and a second image signal; performing overdrive processing on the first image signal to generate a first overdrive image signal; controlling the display panel to first display the first overdrive image signal and then display the second image signal within one frame time.

[0006] Through the technical solution of the embodiments of the present application, it is possible to control the display panel to sequentially display an overdriven image signal (the first overdriven image signal) and a non-overdriven image signal (the second image signal) at different times within one frame time. The gray-scale voltage of the non-overdriven image signal is the same as that of the original image signal, so that the display panel can be controlled to have a relatively accurate display effect. The overdriven image signal can improve the response speed and response time of the display panel, which is beneficial to the application of the display panel in special scenarios, such as the active 3D display scenario. Combining the overdriven image signal and the non-overdriven image signal for display within one frame time is beneficial to improving the display quality of the display panel, reducing or even avoiding problems such as image distortion, and is also beneficial to improving the response speed and response time of the display panel, enabling the display panel to be not only better applied to the active 3D display scenario, but also further applied to the active 3D display scenario in the medical field such as endoscopes.

[0007] In some possible implementation manners, at least two frame image signals include a single-frame first image signal and multiple-frame second image signals, and the method includes: controlling the display panel to sequentially display the single-frame first overdriven image signal and the multiple-frame second image signals at different times within one frame time; or, at least two frame image signals include multiple-frame first image signals and a single-frame second image signal, and the method includes: controlling the display panel to sequentially display the multiple-frame first overdriven image signals and the single-frame second image signal at different times within one frame time; or, at least two frame image signals include multiple-frame first image signals and multiple-frame second image signals, and the method includes: controlling the display panel to sequentially display the multiple-frame first overdriven image signals and the multiple-frame second image signals at different times within one frame time.

[0008] In this implementation manner, by controlling the frame number ratio of the first image signal and the second image signal, it is possible to balance the control of the response speed of the display panel and the image display effect to meet different scenario requirements.

[0009] In some possible implementation manners, the above-mentioned overdriving the first image signal to generate the first overdriven image signal includes: obtaining a third image signal, which is obtained by doubling the frequency of the previous frame image signal of a frame of image signal; through an overdrive look-up table unit, determining the overdrive voltage corresponding to the gray-scale value of the third image signal and the gray-scale value of the first image signal to generate the first overdriven image signal.

[0010] In some possible implementation manners, the above-mentioned obtaining the third image signal includes: obtaining the third image signal through a compression unit; the compressed third image signal is cached through a cache unit; the compressed and cached third image signal is decompressed by a decompression unit and then input to the overdrive look-up table unit.

[0011] In some possible implementations, the display control method is applied to active 3D display, a frame of image signal includes a 3D image signal, and the 3D image signal includes a left-eye image signal or a right-eye image signal.

[0012] In a second aspect, a display control device is provided, comprising: a frequency doubling circuit, for doubling the frequency of a frame image signal to generate at least two identical frames of image signals, wherein the at least two frames of image signals include a first image signal and a second image signal; an overdrive circuit, connected to the frequency doubling circuit, for receiving the first image signal, and overdriving the first image signal to generate a first overdriven image signal; a display control circuit, connected to the overdrive circuit and the frequency doubling circuit, for receiving the first overdriven image signal and the second image signal, and controlling the display panel to display the first overdriven image signal first and then the second image signal within one frame time.

[0013] In some possible embodiments, the display control circuit also includes: a selection switch connected between the frequency doubling circuit and the overdriving circuit, and connected to the display control circuit, the selection switch being used to input the first image signal to the overdriving circuit and the second image signal to the display control circuit, respectively.

[0014] In some possible embodiments, at least two frames of image signals include: at least two frames of image signals include a single frame of first image signal and multiple frames of second image signals, and the display control circuit is used to control the display panel to time-share display the single frame of first overdriven image signal and multiple frames of second image signal within one frame time; or, at least two frames of image signals include multiple frames of first image signals and a single frame of second image signal, and the display control circuit is used to control the display panel to time-share display multiple frames of first overdriven image signal and a single frame of second image signal within one frame time; or, at least two frames of image signals include multiple frames of first image signals and multiple frames of second image signals, and the display control circuit is used to control the display panel to time-share display multiple frames of first overdriven image signals and multiple frames of second image signals within one frame time.

[0015] In some possible embodiments, the overdrive circuit includes: an overdrive lookup table unit, the overdrive lookup table unit is used to obtain a third image signal, and determine an overdrive voltage corresponding to a grayscale value of the third image signal and a grayscale value of the first image signal to generate a first overdrive image signal, wherein the third image signal is obtained by doubling the frequency of a previous frame of an image signal.

[0016] In some possible embodiments, the overdrive circuit further includes: a compression unit configured to obtain a third image signal; a buffer unit connected to the compression unit and configured to buffer the compressed third image signal; and a decompression unit connected to the buffer unit and the overdrive look-up table unit, configured to decompress the compressed and buffered third image signal and input the third image signal into the overdrive look-up table unit.

[0017] In some possible embodiments, the display control device is applied to active 3D display, and one frame of image signal includes a 3D image signal, and the 3D image signal includes a left-eye image signal or a right-eye image signal.

[0018] In a third aspect, a display device is provided, including: a display panel, and a display control device configured to execute the display control method in the first aspect or any one of the embodiments of the first aspect, or the display control device in the second aspect or any one of the embodiments of the second aspect; the display control device is configured to control the display panel to display an image. Description of the Drawings

[0019] Figure 1 The schematic diagram showing the display principle in the 1Cell mode of the active polarized 3D display technology is shown.

[0020] Figure 2 The schematic diagram showing the display principle in the 2Cell mode of the active polarized 3D display technology is shown.

[0021] Figure 3 The schematic diagram showing a liquid crystal response waveform of an LCD display panel is shown.

[0022] Figure 4 The schematic diagram showing a frame display time of an LCD display panel is shown.

[0023] Figure 5 The schematic diagram showing a display control method provided by an embodiment of the present application is shown.

[0024] Figure 6 The schematic diagram showing a display control device provided by an embodiment of the present application is shown.

[0025] Figure 7 The schematic diagram showing another display control device provided by an embodiment of the present application is shown.

[0026] Figure 8 The waveform schematic diagrams of several display panels provided by an embodiment of the present application are shown.

[0027] Figure 9 The waveform schematic diagrams of several other display panels provided by an embodiment of the present application are shown. Detailed Embodiments

[0028] The technical solutions in the present application will be described below in conjunction with the accompanying drawings.

[0029] The present application relates to a display screen or also referred to as a display panel. The display screen can be applied to various fields and scenarios. As an example, the display screen can be applied to 3C electronic products such as computers, communications, and consumer electronics, including but not limited to televisions, mobile phones, computers, laptops, tablets, personal digital assistants (PDAs), in-vehicle computers, wearable devices, gaming devices, shooting devices, etc. The present application does not limit the specific type of the electronic device where the display screen is located.

[0030] In addition, the display screen involved in the present application can be a liquid crystal display (LCD). The liquid crystal display can be, for example, a thin film transistor (TFT) liquid crystal display, that is, a driving circuit in the liquid crystal display panel is formed by using TFTs. Among them, the types of TFTs can include, for example, amorphous silicon (a-Si) TFTs, low temperature poly-silicon (LTPS) TFTs, low temperature polycrystalline oxide (LTPO) TFTs, and indium gallium zinc oxide - metal oxide (IGZO) TFTs, etc. In addition, classified by the driving type, the liquid crystal display can include twisted nematic (TN), in-plane switching (IPS), vertical alignment (VA), etc. The present application does not limit the specific type of the liquid crystal display.

[0031] The present application further relates to active 3D display technologies, including active shutter 3D display and active polarized 3D display. For the convenience of understanding, the active 3D display technology will be introduced first below.

[0032] I. Active polarized 3D display technology

[0033] The active polarization 3D display technology uses a light valve with a switching function (also known as an Active Retarder) to selectively output left-handed and right-handed circularly polarized light parallax images in a front-to-back and full-surface manner. In some examples, the light valve may include a liquid crystal light valve, with a liquid crystal material poured between two glass substrates (ITO and alignment layers are coated on the glass substrates). By controlling the angle of the liquid crystal molecules with voltage to achieve light retardation, and with polarized glasses, light can be transmitted or blocked to achieve the switching of light.

[0034] Currently, there are mainly two light valve solutions for the active polarization 3D display technology: the 1Cell mode and the 2Cell mode.

[0035] (1) The 1Cell mode is also called the polarization control plate (PCP) + quarter wave plate (QWP) mode (abbreviated as the PCP + QWP mode). As an example, Figure 1 shows a schematic diagram of the display principle in this 1Cell mode.

[0036] Combined with Figure 1 As shown, in the 1Cell mode, the light valve is composed of a liquid crystal cell (LC Cell) and a quarter wave plate attached together. Under voltage control, the light valve synchronously responds to the display screen of the LCD display panel (also called the Base Panel or Panel), and alternately operates in the OFF state and the ON state. When the Panel displays the left image, when the light valve operates in the OFF state, the light valve delays the incident light by 1 / 2λ, and converts it into left-handed circularly polarized light through the quarter wave plate. When the Panel displays the right image, the light valve operates in the ON state, does not delay the incident light, retains the original polarization direction, and is converted into right-handed circularly polarized light through the quarter wave plate. In this way, the light valve converts the front and back two frames of parallax images into left-handed and right-handed circularly polarized light parallax images successively. Then, through the polarized glasses, the left image and the right image enter the left eye and the right eye of a person respectively, and finally a 3D image is synthesized in the brain.

[0037] (2) In the 2Cell mode, the light valve is composed of two Cells attached together, which can be named the A light valve and the B light valve respectively. The rubbing directions of the A and B light valves are perpendicular to each other. Under voltage control, they synchronously respond to the display screen of the Panel, and the two light valves alternately operate in the OFF (low voltage) state and the ON state (high voltage). When displaying the previous frame of image, the A light valve is OFF and the B light valve is ON; when displaying the next frame of image, the A light valve is ON and the B light valve is OFF. When the A light valve is OFF, the A light valve is equivalent to a quarter wave plate. When the B light valve is OFF, it is equivalent to a -quarter wave plate. When the A and B light valves are ON, there is no delay for the incident light.

[0038] As an example,Figure 2 It shows a schematic diagram of the display principle in the 2Cell mode.

[0039] Combined with Figure 2 As shown, in the previous frame, when the left image is displayed on the Panel, the A light valve is OFF and the B light valve is ON. The light valve outputs the left image with left-handed circular polarization. After passing through the polarized glasses, the left eye sees the left image and the right eye sees a black image (left-handed circularly polarized light cannot pass through the right lens of right-handed circular polarization). In the next frame, the right image is displayed on the Panel, the A light valve is ON and the B light valve is OFF. The light valve outputs the right image with right-handed circular polarization. After passing through the polarized glasses, the left eye sees a black image and the right eye sees the right image. After such rapid alternating display, a 3D image is finally synthesized in the brain.

[0040] II. Active Shutter 3D Display Technology

[0041] Similar to the principle of the above active polarization 3D display technology, where the Panel displays in a frame sequence of "one frame of left Figure 1 frame of right". However, the light control switch is made on the glasses, so it is also called ShutterGlass 3D.

[0042] In the above active 3D display technologies (including active polarization 3D display technology and active shutter 3D display technology), the Panel displays in accordance with "one frame of left Figure 1 frame of right", requiring a refresh rate of at least 120Hz, and also requiring the response speed of the Panel to be fast enough. For example, when the left eye is viewing, the right image on the Panel has been completely switched to the left image and the liquid crystal response has been completed; when the right eye is viewing, the left image on the Panel has been completely switched to the right image and the liquid crystal response has been completed. If the liquid crystal does not respond in time, serious crosstalk will occur.

[0043] After the image data of a frame is written into the Panel, before the liquid crystal has completed the reaction, the backlight needs to be turned off to reduce crosstalk. In the case of a refresh rate of 120Hz, the display time for each frame is only 8.33ms. To make the backlight on time as long as possible during each frame, the response speed of the Panel is required to be fast enough. The response time from gray to gray (Gray To Gray, GTG) should be within 3ms or even within 1ms. To meet this response speed requirement, the OD (overdrive) function needs to be used.

[0044] When the grayscale change of adjacent frames is detected, the OverDrive (OD) function of the display screen may be triggered. The OD function is a technology that accelerates the response time of liquid crystal molecules by adjusting the voltage of liquid crystal pixels. When the OD function is enabled, the electric field voltage applied to the liquid crystal molecules will change to a voltage higher or lower than the target grayscale voltage to accelerate the rotation of the liquid crystal molecules, forcing the liquid crystal molecules to change angles within a shorter time, achieving a faster response time and response speed.

[0045] To illustrate the necessity of the OD function, the following will explain the definition of the response time and the response speed required for active 3D display in combination with Figure 3 and Figure 4 illustrate.

[0046] Figure 3 A schematic diagram of a liquid crystal response waveform of an LCD display screen is shown. This liquid crystal response waveform can be a voltage-time waveform.

[0047] As Figure 3 shown, in this liquid crystal response waveform, the rise time (△t2) can be defined as the time between 10% and 90% of the voltage amplitude, that is, the time taken for the 80% change in the middle of the rising edge. Similarly, the fall time is the same situation. For general 2D applications, this definition is strict and precise enough. For 3D applications, because crosstalk is usually required to be <2% or even smaller, the time (△t1) between 0% and 10% of the voltage amplitude and the time (△t3) between 90% and 100% in the waveform cannot be ignored. In particular, the changes at the top and bottom of the waveform are usually relatively slow, and △t1 and △t3 in the left figure will be relatively large.

[0048] Figure 4 A schematic diagram of a frame display time of an LCD display screen is shown.

[0049] As Figure 4As shown, within a frame display time (8.33ms), it is divided into a vertical blanking interval (Vertical Blanking Interval, V blank) and a vertical active period (Vertical Active Period, V active). V blank is the "blank interval" between frames, and no image data is output at this time. V active is the period when the display actually displays image data. In order to give the liquid crystal a longer response time, V blank can be set as wide as possible. For example, the V blank area can be set to 3.41ms and the V active area can be set to 4.92ms. Corresponding to the backlight being divided into 5 areas, V active is also divided into 5 areas. When the backlight is scanned, assuming that the lighting duty cycle of each area is 20%, the lighting time = 8.33*20% = 1.666ms, then the response time left for the second area = 6.362-1.666 = 4.696ms, assuming that the rising edge or falling edge of the liquid crystal response waveform is linear, then the traditionally defined response = 4.696*80% = 3.757ms.

[0050] The rising edge or falling edge of a normal liquid crystal response waveform is not linear, and is relatively slow at the top or bottom. Therefore, even if the backlight duty cycle of each zone is only 20%, the liquid crystal response time between each two gray levels (not the average response time) must be less than 3.757ms to prevent light crosstalk.

[0051] Therefore, the OD function is needed to effectively achieve a liquid crystal response time between two gray levels of less than 3.757ms.

[0052] In this application, the voltage higher or lower than the target grayscale voltage is referred to as OD voltage, and the grayscale corresponding to the OD voltage is called overdrive grayscale, also known as boost grayscale. Under the action of OD voltage, the change process of grayscale displayed from the current frame to the next frame is as follows: current grayscale (current grayscale voltage) → boost grayscale (OD voltage) → target grayscale (target grayscale voltage).

[0053] In some embodiments, when the Panel triggers the OD function, the grayscale of the current frame and the next frame is first obtained, and the table (also called OD table) is queried to obtain the boost grayscale of the next frame. When the next frame arrives, the voltage applied to the Panel is the boost grayscale voltage. And this boost grayscale voltage will be maintained for one frame time. If the grayscale of the next frame is the same as the grayscale of the next frame, the grayscale voltage of the next frame (target grayscale voltage) is the same as the grayscale voltage of the next frame. If the grayscale of the next frame is different from the grayscale of the next frame, the OD table is continued to be queried and the above process is repeated.

[0054] It can be seen that during the next frame, the brightness displayed by the Panel has a changing process: gradually changing from the current gray-scale brightness to the boost gray-scale brightness. For example, if the current frame is at 16 gray-scale, the next frame is at 232 gray-scale, and the boost gray-scale is 255 gray-scale, then the displayed brightness during the next frame gradually changes from 16 gray-scale brightness to 255 gray-scale brightness, and the actual brightness observed by the viewer is the average brightness of this process. This average brightness often cannot exactly equal the 232 gray-scale brightness, so the image brightness seen by the viewer is a distorted brightness, that is, the image presented to the viewer is distorted.

[0055] Furthermore, the image R, G, B components have separate RGB OD tables, which will cause the ratio between the R, G, B components of the next frame to change, resulting in color distortion of being redder, greener, or bluer.

[0056] The active 3D display mode is a display mode of "one frame for the left Figure 1 frame and one frame for the right", and there is a parallax between the left and right frames. Therefore, at certain positions (such as the edge of an object), there are always differences in the gray-scales of the R, G, B components of two adjacent frames, which causes the OD action to be triggered every time the Panel displays each frame, making the Panel always work under the OD voltage and unable to return to the target gray-scale voltage. Therefore, the above-mentioned distortion always exists. Moreover, the greater the parallax, the larger the distorted area.

[0057] In different application fields, the "tolerance" for image distortion is different. For example, the medical field does not allow image distortion. As an example, in the application scenario of a medical endoscope, under the illumination of the light source of a binocular endoscope, the light intensity of the left camera illuminating a certain position is weak, and the pink muscle tissue with a slightly lower display brightness is shown. The light intensity of the right camera illuminating the same position is strong, making this area present as a highly bright white reflective area. During the 3D display process, when viewed with the left eye, actually the Panel has just experienced the switching process from the right frame to the left frame. Under the action of the OD function, the originally reddish position is enhanced and becomes a "red patch", resulting in image distortion.

[0058] As an example, Table 1 below shows a case of image distortion in the medical application scenario of an active polarized 3D display in an endoscope surgery.

[0059] Table 1

[0060]

[0061] As shown in Table 1, for the image viewed with the left eye, the boost gray-scales of the R, G, B components are obtained by looking up the table respectively. The boost gray-scale of the R component is 165, the boost gray-scale of the G component is 0, and the boost gray-scale of the B component is 0. Therefore, the image of this area viewed with the left eye shows a red patch.

[0062] Due to the above-mentioned influences, the OD function cannot be applied to active 3D displays in medical fields such as endoscopes.

[0063] In view of this, an embodiment of the present application provides a display control method, which can improve or even solve the distortion problem caused by the above-mentioned OD function, enhance the display effect, and expand the application field of the display device, for example, to medical fields such as endoscopes.

[0064] Figure 5 A schematic diagram of a display control method provided in an embodiment of the present application is shown.

[0065] like Figure 5 As shown, the display control method 100 may include the following steps.

[0066] S110 , frequency-multiplying a frame of image signal to generate at least two identical frames of image signals, where the at least two frames of image signals include a first image signal and a second image signal.

[0067] S120: Perform overdrive processing on the first image signal to generate a first overdrive image signal.

[0068] S130, controlling the display panel to display the first over-driven image signal first and then the second image signal within one frame time.

[0069] In the embodiment of the present application, the display control method may be executed by a display control device. The display control device may include a software device and / or a hardware device. For example, the hardware device of the display control device may include a control chip, a control circuit, etc. The embodiment of the present application does not limit the specific form of the display control device.

[0070] As an example, Figure 6 A schematic diagram of a display control device provided in an embodiment of the present application is shown.

[0071] like Figure 6 As shown, the display control device 200 includes a frequency doubling circuit 210, an overdriving circuit 220 and a display control circuit 230. The frequency doubling circuit 210 can be used to execute the above S110, that is, to double the frequency of a frame of image signal to generate at least two identical frames of image signals. The overdriving circuit 220 is connected to the frequency doubling circuit 210, and is used to receive the first image signal, and execute the above S120, that is, to overdrive the first image signal to generate a first overdriven image signal. The display control circuit 230 is connected to the overdriving circuit 220 and the frequency doubling circuit 210, and is used to receive the first overdriven image signal and the second image signal, and execute the above S130, that is, to control the display panel to time-share the first overdriven image signal and the second image signal within one frame time.

[0072] In S110, the frequency doubling circuit performs frequency doubling processing on a frame of image signal to be displayed to generate at least two identical frames of image signals, wherein the frame rate of the at least two frames of image signals is X times the frame rate of the original frame of image signal, where X is a positive integer greater than 1.

[0073] As an example, the frequency multiplication circuit may include a 2-frequency multiplication circuit, which performs frequency multiplication processing on an input original frame of image signal and outputs two frames of completely identical image signals. The frame rate of the input image signal of the frequency multiplication circuit may be, for example, 120 Hz, and the frame rate of the output image signal may be 240 Hz.

[0074] In other examples, the frequency multiplication circuit may include an X-frequency multiplication circuit with other multiples such as 3 times the frequency, 4 times the frequency, etc. The X-frequency multiplication circuit may output X frames of completely identical image signals, and the frame rate of each frame of the output image signal may be X times the frame rate of the input original image signal.

[0075] In S120, the overdrive processing circuit can perform overdrive (OD) processing on any image signal output by the above-mentioned frequency doubling circuit. In the present application, for the sake of ease of description, the image signal output by the frequency doubling circuit for overdrive processing is referred to as the first image signal, and the other image signal for overdrive processing is referred to as the second image signal.

[0076] After OD processing, the voltage of the first image signal can be changed (this voltage can be used to control the grayscale of the display panel, and thus can also be called grayscale voltage), that is, after the first image signal is processed by OD, the voltage of the first overdrive image signal (or grayscale voltage) formed can be an overdrive voltage (OD voltage for short). The OD voltage carried by the first overdrive image signal can quickly drive the liquid crystal molecules in the LCD to rotate, forcing the liquid crystal molecules to change their angles in a shorter time, thereby achieving a faster response time and response speed.

[0077] In S130, the display control circuit can control the display panel to time-share display the first overdriven image signal and the second image signal within one frame time. The one frame time is the same as the display time of the original one frame image signal. For example, if the frame rate of the original one frame image signal is 120Hz, the one frame time is 8.33ms. After the frequency doubling process, the display time of the first image signal and the second image signal are both 1 / X of the display time of the original one frame image signal, and the display time (frame rate) of the first overdriven image signal is the same as the display time (frame rate) of the first image signal, and is therefore also 1 / X of the display time of the original one frame image signal. For example, if the frame rate of the first image signal and the second image signal is 240Hz, the display time of the first image signal and the second image signal is 4.165ms, and the display time of the first overdriven image signal is also 4.165ms.

[0078] Therefore, within one frame time, the display control device can control the display panel to display the first overdrive image signal and the second image signal in a time-sharing manner, and the sum of the display time of the first overdrive image signal and the display time of the second image signal can be equal to the display time of the original one-frame image signal.

[0079] Through the technical solution of the embodiments of the present application, it is possible to control the display panel to display an overdrive image signal (the first overdrive image signal) and a non-overdrive image signal (the second image signal) in a time-sharing manner within one frame time. The gray-scale voltage of the non-overdrive image signal is the same as that of the original image signal, so that the display panel can be controlled to have a relatively accurate display effect. The overdrive image signal can improve the response speed and response time of the display panel, which is beneficial to the application of the display panel in special scenarios, such as the active 3D display scenario. Combining the display of the overdrive image signal and the non-overdrive image signal within one frame time is not only beneficial to improving the display quality of the display panel, reducing or even avoiding problems such as image distortion, but also beneficial to improving the response speed and response time of the display panel, enabling the display panel to be not only better applied to the active 3D display scenario, but also further applied to the active 3D display scenario in medical fields such as endoscopes.

[0080] Figure 7 The schematic diagram of another display control device provided by the embodiments of the present application is shown.

[0081] As Figure 7 shown, the display control device 200 includes a frequency doubling circuit, a gating switch, and an overdrive (OD) circuit. Among them, the gating switch is connected between the frequency doubling circuit and the OD circuit. In addition, the display control device 200 further includes a display control circuit (not shown in the figure), and the display control circuit can be connected to Figure 7 the output end shown in

[0082] In Figure 7 the shown embodiment, the frequency doubling circuit can receive the input nth frame image signal G n to be displayed, and perform frequency doubling processing on it, and output two identical frame image signals G' N and G N . The frame rate of the input signal G n of the frequency doubling circuit can be, for example, 120 Hz, and the frame rate of the output signals G' N and G N is 240 Hz. The output signal of the frequency doubling circuit passes through the gating switch, and one frame of the image signal G N (corresponding to the first image signal) is input to the OD circuit, and the other frame of the image signal G' N(Corresponding to the second image signal) is directly output to the backend circuit. For example, the backend circuit includes a display control circuit. Among them, the image signal G N can be the previous frame image signal of the two frame image signals output by the frequency doubling circuit, and the image signal G' N can be the latter frame image signal of the two frame image signals output by the frequency doubling circuit.

[0083] The image signal G input to the OD circuit N can be processed by OD to form the image signal G N-OD (corresponding to the first over-drive image signal). The gray-scale voltage of this image signal G N-OD is the OD voltage, which is different from the gray-scale voltage of the image signal G N . However, the frame rate of this image signal G N-OD is the same as that of the image signal G N , for example, both are 240Hz.

[0084] The backend circuit (display control circuit) can receive two frame image signals G' N and G N-OD with a frame rate of 240Hz, and within one frame time with a frame rate of 120Hz, respectively control the display panel to display these two frame image signals G' N and G N-OD . In the embodiments of the present application, the image signal G N-OD can be displayed first, and then the image signal G' N is displayed.

[0085] When displaying the image signal G N-OD first and then the image signal G' N , the OD voltage can be applied to the liquid crystal molecules in the display panel first, and then return to the target gray-scale voltage, that is, the gray-scale voltage of the original input image, so as to effectively reduce the probability of image distortion and improve the display effect of the display panel.

[0086] Optionally, the backend circuit (display control circuit) can receive two frame image signals G' N and G N-OD in a time-sharing manner, and sequentially control the display panel to display these two frame image signals. Or, the backend circuit can also receive these two frame image signals G' N and G N-OD in parallel, and control the display panel to display these two frame image signals in a time-sharing manner. In other words, in the embodiments of the present application, the time difference for the display panel to display two frame image signals G' N and G N-OD can be controlled by the backend circuit, or can also be controlled by the front-end circuit, such as at least one of the frequency doubling circuit, the OD circuit, or the gating switch.

[0087] In addition, Figure 7 Taking the frame rate of the input image signal of the frequency doubling circuit shown in as an example of 120 Hz, in addition to 120 Hz, the frame rate of the input image signal can also be adjusted according to the display requirements, and the embodiments of the present application do not make specific limitations thereto. Similarly, Figure 7 Taking the frame rate of the output image signal of the frequency doubling circuit shown in as an example of 240 Hz, the frame rate of the output image signal is related to the frame rate of the input image signal of the frequency doubling circuit and the multiple of the frequency doubling circuit, and the embodiments of the present application do not make specific limitations thereto either.

[0088] Continuing to refer to Figure 7 As shown, in some embodiments, the OD circuit may include a compression unit, a buffer unit, a decompression unit, and an overdrive look-up table (OD LUT) unit.

[0089] In the OD circuit, the main unit is the OD LUT unit, which can establish a two-dimensional gray scale conversion matrix. The input parameters of the OD LUT unit include the gray scale of the (n-1)th frame and the target gray scale of the nth frame, and the output parameters include the overdrive voltage value to be applied to the nth frame image. In the embodiments of the present application, the OD LUT unit can determine the corresponding overdrive voltage based on the gray scale value of the (n-1)th frame image signal and the gray scale value of the nth frame image signal, and based on this overdrive voltage, an overdrive image signal for the nth frame image signal can be generated.

[0090] Optionally, in some embodiments, the OD LUT unit can receive the (n-1)th frame image signal and the image signal after frequency doubling of the nth frame image signal, so as to obtain the gray scale values of these two frame image signals. For example, the (n-1)th frame image signal G n-1 generates an image signal G' after passing through the frequency doubling circuit N-1 and G N-1 , where the image signal G N-1 (for the sake of distinction, also referred to as the third image signal) can be input to the OD circuit. Referring to the above, the nth frame image signal G n generates an image signal G' after passing through the frequency doubling circuit N and G N , where the image signal G N (corresponding to the first image signal) can also be input to the OD circuit. The OD LUT unit can determine the OD voltage based on the gray scale values of the image signal G N-1 and G N , so as to generate the image signal G N-OD .

[0091] Optionally, the buffer unit in the OD circuit is also referred to as a Frame Buffer unit, which is used to store the image signals G N-1 and G N data, thereby facilitating the query of the subsequent OD LUT unit. Optionally, in order to reduce the demand for the frame buffer capacity, while reducing the data transmission bandwidth, and avoiding problems such as excessive cost or increased latency caused by storing data, a compression unit and a decompression unit can also be provided in the OD circuit. The compression unit can first compress the received image signal and then store it in the buffer unit, and the decompression unit can read the compressed data from the buffer unit and decompress the compressed data to restore it to the image signal.

[0092] Figure 8 FIG. shows the waveform schematic diagrams of several display panels provided by the embodiments of the present application.

[0093] As Figure 8 shown in part (a) of FIG., when the OD function of the display panel is not enabled, the gray-scale voltage of each frame of the image signal is the target gray-scale voltage. For example, in a 3D display scenario, the target gray-scale voltage of the left image signal is 16 gray-scale voltages, and the target gray-scale voltage of the right image signal is 232 gray-scale voltages.

[0094] As Figure 8 shown in part (b) of FIG., when the OD function of the display panel is enabled, the gray-scale voltage of each frame of the image signal is the OD voltage. For example, in a 3D display scenario, the over-drive voltage of the left image signal is 0 gray-scale voltages, and the over-drive voltage of the right image signal is 255 gray-scale voltages. Compared with the target gray-scale voltage of the left image signal (16 gray-scale voltages) and the target gray-scale voltage of the right image signal (232 gray-scale voltages), when the OD function is enabled, each frame of the display panel operates at the true voltage.

[0095] As Figure 8 shown in part (c) of FIG., based on the above technical solution provided by the present application, when the improved OD function of the display panel is enabled, the gray-scale voltage of each frame of the image signal can include the OD voltage and the target gray-scale voltage. For example, in a 3D display scenario, the voltage of the left image signal can change from 0 gray-scale voltages (OD voltage) to 16 gray-scale voltages (target gray-scale voltage), and the voltage of the left image signal can change from 255 gray-scale voltages (OD voltage) to 232 gray-scale voltages (target gray-scale voltage). Based on this solution, both the response speed of the display panel and the display effect of the display panel can be improved, and display problems such as image distortion can be reduced.

[0096] Figure 9 FIG. shows the waveform schematic diagrams of several other display panels provided by the embodiments of the present application.

[0097] AsAs shown in part (a) of Figure 9 , during the process of the display panel displaying each frame of image signal, the voltage of the image signal is the OD voltage for 1 / 2 of the time, and the voltage of the image signal is the target gray-scale voltage for the other 1 / 2 of the time. That is, within one frame time, the ratio of the time of the OD voltage to the time of the target gray-scale voltage is 1:1. In this embodiment, the display control device may include a frequency doubling circuit and generate two frames of the same image signal, and the frame rate of each frame of the image is twice that of the original image. One frame of the image signal is displayed after OD processing (corresponding to the OD voltage), and the other frame of the image signal is directly displayed (corresponding to the target gray-scale voltage). In this embodiment, among the multiple frames of image signals generated by the frequency doubling circuit, the number of image signals for OD processing (corresponding to the first image signal) is the same as the number of image signals without OD processing (corresponding to the second image signal). Therefore, within one frame time of the display panel, the ratio of the time of the OD voltage to the time of the target gray-scale voltage is 1:1, and the response speed of the display panel and the image display effect can be controlled more evenly.

[0098] As Figure 9 As shown in part (b) of Figure 9 , during the process of the display panel displaying each frame of image signal, the voltage of the image signal is the OD voltage for 2 / 3 of the time, and the voltage of the image signal is the target gray-scale voltage for the other 1 / 3 of the time. That is, within one frame time, the ratio of the time of the OD voltage to the time of the target gray-scale voltage is 2:1. In this embodiment, the display control device may include a frequency tripling circuit and generate three frames of the same image signal, and the frame rate of each frame of the image is three times that of the original image. Two frames of the image signal are displayed after OD processing (corresponding to the OD voltage), and the other frame of the image signal is directly displayed (corresponding to the target gray-scale voltage). In this embodiment, among the multiple frames of image signals generated by the frequency tripling circuit, the ratio of the number of image signals for OD processing (corresponding to the first image signal) to the number of image signals without OD processing (corresponding to the second image signal) is 2:1. Therefore, within one frame time of the display panel, the ratio of the time of the OD voltage to the time of the target gray-scale voltage is 2:1, and the time of the OD voltage is longer. While improving the image display effect, the response speed of the display panel can be improved to a greater extent.

[0099] As Figure 9 ​As shown in part (c), during the display of each frame of image signal on the display panel, the voltage of the image signal is the OD voltage for 1 / 3 of the time, and the voltage of the image signal is the target gray-scale voltage for the other 2 / 3 of the time. That is, within one frame time, the ratio of the time of the OD voltage to the time of the target gray-scale voltage is 1:2. In this embodiment, the display control device may include a triple-frequency circuit and generate three identical frames of image signals, with the frame rate of each frame being three times that of the original image. One frame of the image signal is displayed after OD processing (corresponding to the OD voltage), and the other two frames of image signals are directly displayed (corresponding to the target gray-scale voltage). In this embodiment, among the multiple frames of image signals generated by the frequency doubling circuit, the ratio of the number of image signals for OD processing (corresponding to the first image signal) to the number of image signals without OD processing (corresponding to the second image signal) is 1:2. Therefore, within one frame time of the display panel, the ratio of the time of the OD voltage to the time of the target gray-scale voltage is 1:2, and the time of the target gray-scale voltage is longer. While improving the response speed of the display panel, the image display effect can be significantly improved.

[0100] Figure 9 The 3 part shown is only for illustration and not for limitation. In some other embodiments of the present application, within one frame time of the display panel, the ratio of the time of the OD voltage to the time of the target gray-scale voltage may also be other ratios, and the embodiments of the present application do not limit this. Correspondingly, according to this ratio, the multiple of the frequency doubling circuit and the number of frames of the generated image signals can be set.

[0101] The technical solutions of any of the above embodiments of the present application can be applied to 2D display and 3D display of LCD display panels, and are particularly applicable to active 3D display, which may include the active shutter 3D display and the active polarization 3D display introduced above. In active 3D display, the image signals input to the display control device may include left-eye image signals (also referred to as left-image signals above) or right-eye image signals (also referred to as right-image signals above).

[0102] Optionally, in the technical solutions of any of the above embodiments of the present application, the display control circuit in the display control device may include a Timing Controller (TCON). The TCON can be used to convert the input image signal / video signal into precise timing and voltage signals for driving the display panel, thereby controlling the display of the display panel.

[0103] In some examples, a frequency doubling circuit can be added to the TCON board or the front-end system board. The frequency doubling circuit can include, for example, a System On Chip (SoC) or a Field-Programmable Gate Array (FPGA). It copies and doubles the 3D image signal (such as a frame sequence signal with a refresh rate of 120 Hz), changing the original one frame signal into two identical frames. At the same time, the refresh rate changes from 120 Hz to 240 Hz. That is, the frequency doubling circuit inputs one frame and outputs two identical frames. Among them, the front frame is output to the TCON output after OD processing, and the latter frame is directly output to the TCON output. Alternatively, in addition to the above 2-fold frequency doubling, 3-fold frequency doubling or multiple frequency doubling can also be performed. For example, in the case of 3-fold frequency doubling, one or two front frames of the signal are processed by OD, and the latter two or one frame passes through directly. Within one frame of the 3D image signal, first let the liquid crystal of the display panel work at the OD voltage and then return to the target gray scale voltage, so as to balance the response speed and the display effect.

[0104] This application also provides an electronic device, which may include a display panel and a display control device. Among them, the display control device is used to control the display panel to display an image. Optionally, the display control device can be used to execute the control method provided in any of the above embodiments, or includes the circuit modules in any of the above embodiments.

[0105] The display panel can include a liquid crystal display panel. The electronic device can be any electronic device adapted to the liquid crystal display panel. As an example, the electronic device can be a device supporting 3D display, such as: a television, a projector, a portable computer, a professional device (such as a medical device or an industrial device, etc.). The embodiments of this application do not limit the specific application form of the electronic device.

[0106] In the above method embodiments, the magnitudes of the sequence numbers of the processes do not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of this application.

[0107] In this application, unless otherwise clearly specified and limited, "connection" includes direct connection or indirect connection between objects: the connected objects can be directly connected through a medium (such as a wire, a trace, etc.), or can be indirectly connected through other components, or can be internally connected.

[0108] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: the existence of A, the simultaneous existence of A and B, and the existence of B.

[0109] Unless otherwise defined, all technical and scientific terms used in this application shall have the same meanings as commonly understood by those of ordinary skill in the technical field to which this application pertains; the terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0110] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. On the premise of no conflict, the various embodiments described in this application and / or the technical features in each embodiment can be arbitrarily combined with each other, and the technical solutions obtained after combination should also fall within the protection scope of this application. Those skilled in the art explicitly and implicitly understand that the embodiments described in this application can be combined with other embodiments.

[0111] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in connection with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of this application.

[0112] In several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0113] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed over multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0114] In addition, each functional unit in various embodiments of the present application may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit.

[0115] If the described function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0116] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, and all of them should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A display control method, characterized in that: include: Frequency-multiplying a frame of image signal to generate at least two identical frames of image signal, wherein the at least two frames of image signal include a first image signal and a second image signal; Performing overdrive processing on the first image signal to generate a first overdrive image signal; The display panel is controlled to display the first over-driven image signal first and then the second image signal within one frame time.

2. The display control method according to claim 1, characterized in that: The at least two frames of image signals include a single frame of the first image signal and multiple frames of the second image signal, and the method includes: controlling the display panel to time-share display a single frame of the first overdriven image signal and multiple frames of the second image signal within one frame; or The at least two frames of image signals include multiple frames of the first image signals and a single frame of the second image signal, and the method includes: controlling the display panel to time-share display multiple frames of the first overdriven image signals and a single frame of the second image signal within one frame; or The at least two frames of image signals include multiple frames of the first image signal and multiple frames of the second image signal. The method includes: controlling the display panel to time-share display multiple frames of the first over-driven image signal and multiple frames of the second image signal within one frame time.

3. The display control method according to claim 1, characterized in that: The overdriving process is performed on the first image signal to generate a first overdriven image signal, comprising: Acquire a third image signal, wherein the third image signal is obtained by frequency doubling a previous frame image signal of the one frame image signal; The over-driving voltage corresponding to the grayscale value of the third image signal and the grayscale value of the first image signal is determined by the over-driving lookup table unit to generate the first over-driving image signal.

4. The display control method according to claim 3, characterized in that: The acquiring of the third image signal comprises: Acquire the third image signal through a compression unit; The compressed third image signal is cached by a cache unit; The compressed and cached third image signal is decompressed by a decompression unit and then input into the over-driving lookup table unit.

5. The display control method according to any one of claims 1 to 4, characterized in that: The display control method is applied to active 3D display, the one frame image signal includes a 3D image signal, and the 3D image signal includes a left-eye image signal or a right-eye image signal.

6. A display control device, characterized in that: include: A frequency doubling circuit, used for doubling the frequency of a frame of image signal to generate at least two frames of identical image signals, wherein the at least two frames of image signals include a first image signal and a second image signal; an overdrive circuit, connected to the frequency multiplication circuit, configured to receive the first image signal and perform overdrive processing on the first image signal to generate a first overdrive image signal; A display control circuit is connected to the overdrive circuit and the frequency doubling circuit, and is used to receive the first overdrive image signal and the second image signal, and control the display panel to display the first overdrive image signal first and then the second image signal within one frame time.

7. The display control device according to claim 6, characterized in that: Also includes: A selection switch is connected between the frequency doubling circuit and the over-driving circuit, and is connected to the display control circuit. The selection switch is used to input the first image signal to the over-driving circuit and the second image signal to the display control circuit respectively.

8. The display control device according to claim 6, characterized in that: The at least two frames of image signals include a single frame of the first image signal and multiple frames of the second image signal, and the display control circuit is used to control the display panel to time-share display a single frame of the first overdriven image signal and multiple frames of the second image signal within one frame; or The at least two frames of image signals include multiple frames of the first image signals and a single frame of the second image signal, and the display control circuit is used to control the display panel to time-share display multiple frames of the first over-driven image signals and a single frame of the second image signal within one frame; or The at least two frames of image signals include multiple frames of the first image signal and multiple frames of the second image signal, and the display control circuit is used to control the display panel to time-share display multiple frames of the first over-driven image signal and multiple frames of the second image signal within one frame time.

9. The display control device according to claim 6, characterized in that: The overdrive circuit includes: an overdrive lookup table unit, which is used to obtain a third image signal and determine an overdrive voltage corresponding to a grayscale value of the third image signal and a grayscale value of the first image signal to generate the first overdrive image signal, wherein the third image signal is obtained by doubling the frequency of a previous frame image signal of the one frame image signal.

10. The display control device according to claim 9, characterized in that: The overdrive circuit further includes: A compression unit, configured to obtain the third image signal; a cache unit, connected to the compression unit, and configured to cache the compressed third image signal; A decompression unit is connected to the cache unit and the over-driving lookup table unit, and is used for decompressing the compressed and cached third image signal and inputting the third image signal into the over-driving lookup table unit.

11. The display control device according to any one of claims 6 to 10, characterized in that: The display control device is applied to active 3D display, the one frame image signal includes a 3D image signal, and the 3D image signal includes a left-eye image signal or a right-eye image signal.

12. A display device, characterized in that: include: display panel, and A display control device for executing the display control method according to any one of claims 1 to 5, or a display control device according to any one of claims 6 to 11; The display control device is used to control the display panel to display an image.

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