Laser projection equipment and display method

Abstract

The embodiment of the invention belongs to the display technology, and provides laser projection equipment and a display method, the laser projection equipment comprises a main control chip and a display driving assembly, and the main control chip is configured to display subtitles on the condition that a picture of a video stream comprises the subtitles and the brightness of the picture is smaller than preset brightness. Performing dimming processing on the first picture of the video stream through a display driving component, and displaying a second picture of the video stream after dimming processing; the brightness of the caption area of the second picture is smaller than that of the caption area of the first picture; in response to the picture adjustment instruction, performing picture adjustment processing on a second picture of the video stream through the display driving component, and displaying a third picture of the video stream after picture adjustment; the difference value between the third brightness of the caption area of the third picture and the brightness of the caption area of the second picture is smaller than the brightness threshold value. By means of the mode, the problem that dimming processing fails after picture adjustment can be avoided, and the display effect is improved.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of display. More particularly, it relates to a laser projection device and a display method. BACKGROUND

[0002] With the development of technology, laser televisions have been used by more and more users due to their characteristics of true color, eye health protection, etc.

[0003] In the related art, in order to improve the display effect, the display picture can be dynamically dimmed. When there is a subtitle in the display picture, the range of dynamic dimming can be limited to the display area outside the subtitle, so as to reduce the influence of the subtitle on the dynamic dimming effect.

[0004] However, after the laser television performs geometric correction, the display effect of the picture is poor. SUMMARY

[0005] Exemplary embodiments of the present application provide a laser projection device and a display method, which can improve the display effect of the picture.

[0006] In a first aspect, the present application provides a laser projection device, comprising: a master control chip and a display driving assembly, wherein the master control chip is configured to:

[0007] In a case where a picture of a video stream includes a subtitle and the brightness of the picture is less than a preset brightness, the display driving assembly is configured to perform dimming processing on a first picture of the video stream, and display a second picture of the video stream after dimming processing; the brightness of a subtitle area of the second picture is less than the brightness of a subtitle area of the first picture;

[0008] In response to a picture adjustment instruction, the display driving assembly is configured to perform picture adjustment processing on a second picture of the video stream, and display a third picture of the video stream after picture adjustment; the difference between the third brightness of the subtitle area of the third picture and the brightness of the subtitle area of the second picture is less than a brightness threshold; the picture adjustment instruction includes a geometric correction instruction and / or a focal length adjustment instruction.

[0009] In some embodiments, the display driving assembly is configured to:

[0010] After dimming processing is performed on the first picture, the first control current for displaying the first picture is adjusted to a second control current for displaying the second picture; the first control current is greater than the second control current;

[0011] After the second picture is processed by the picture adjustment process, a second control current for displaying the second picture is adjusted to a third control current for displaying the third picture; a difference between the second control current and the third control current is less than a current threshold.

[0012] In some embodiments, the master control chip is configured to:

[0013] A first display area displaying the second picture, a first target display area, and a second display area displaying the third picture are obtained; the first target display area is an area of the second picture excluding a subtitle area;

[0014] According to the first display area, the first target display area, and the second display area, a second target display area is determined, and the second target display area and image data of the third picture are sent to the display driving component, so that the display driving component displays the third picture based on the image data and the second target display area; the second target display area is an area of the third picture excluding a subtitle area.

[0015] In some embodiments, the master control chip is configured to:

[0016] A mapping relationship between the first display area and the second display area is obtained;

[0017] According to the mapping relationship, the first target display area is mapped to determine the second target display area.

[0018] In some embodiments, the master control chip is configured to:

[0019] According to the horizontal coordinates of the first display area and the horizontal coordinates of the second display area, a first mapping relationship is determined;

[0020] According to the vertical coordinates of the first display area and the vertical coordinates of the second display area, a second mapping relationship is determined;

[0021] According to the first mapping relationship, the horizontal coordinates of the first target display area are mapped to obtain the horizontal coordinates of the second target display area;

[0022] According to the second mapping relationship, the vertical coordinates of the first target display area are mapped to obtain the vertical coordinates of the second target display area.

[0023] In some embodiments, the display driving component is configured to:

[0024] The image data corresponding to the or second target display area is processed by contrast to obtain first target image data;

[0025] Set the brightness of the image data corresponding to the region except the second target display region as a target brightness, to obtain second target image data;

[0026] Display the third image according to the first target image data and the second target image data.

[0027] In some embodiments, the master control chip is configured to:

[0028] After receiving a dimming instruction or detecting that a dimming mode is turned on, perform dimming processing on the first picture of the video stream by the display driving component.

[0029] In a second aspect, the embodiments of the present application provide a display method, comprising:

[0030] In a case where a picture of a video stream includes a subtitle and the brightness of the picture is less than a preset brightness, perform dimming processing on a first picture of the video stream, and display a second picture of the video stream after dimming processing; the brightness of a subtitle region of the second picture is less than the brightness of a subtitle region of the first picture.

[0031] In response to a picture adjustment instruction, perform picture adjustment processing on a second picture of the video stream, and display a third picture of the video stream after picture adjustment; the third brightness of the subtitle region of the third picture and the brightness of the subtitle region of the second picture have a difference less than a brightness threshold; the picture adjustment instruction includes a geometric correction instruction and / or a focal length adjustment instruction.

[0032] The laser projection device and the display method provided by the embodiments of the present application, the laser projection device comprises: a master control chip and a display driving component, the master control chip is configured to: in a case where a picture of a video stream includes a subtitle and the brightness of the picture is less than a preset brightness, perform dimming processing on a first picture of the video stream by the display driving component, and display a second picture of the video stream after dimming processing; the brightness of a subtitle region of the second picture is less than the brightness of a subtitle region of the first picture; in response to a picture adjustment instruction, perform picture adjustment processing on a second picture of the video stream by the display driving component, and display a third picture of the video stream after picture adjustment; the third brightness of the subtitle region of the third picture and the brightness of the subtitle region of the second picture have a difference less than a brightness threshold; the picture adjustment instruction includes a geometric correction instruction and / or a focal length adjustment instruction. The above projection device can avoid the problem that the display region which needs to be dimmed due to picture adjustment deviates, the dimming processing is invalid, and the display effect is affected. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art based on these drawings.

[0034] Figure 1 A schematic diagram of a laser projection device provided by an embodiment of the present application;

[0035] Figure 2 A schematic diagram of a picture partition provided by an embodiment of the present application;

[0036] Figure 3 A schematic diagram of a structure of a laser projection device provided by an embodiment of the present application;

[0037] Figure 4 A schematic diagram of a structure of another laser projection device provided by an embodiment of the present application;

[0038] Figure 5 A flowchart of a display method provided by an embodiment of the present application;

[0039] Figure 6 A schematic diagram of a display area provided by an embodiment of the present application;

[0040] Figure 7 A schematic diagram of another display area provided by an embodiment of the present application;

[0041] Figure 8 A flowchart of another display method provided by an embodiment of the present application;

[0042] Figure 9 A schematic diagram of a structure of a display device provided by an embodiment of the present application.

[0043] The above drawings have shown the specific embodiments of the present application, and the following will have more detailed description. These drawings and textual description are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] In order to make the purposes, implementation manners and advantages of the present application more clear, the following will clearly and completely describe the exemplary implementation manners of the present application by combining the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only some of the embodiments of the present application, but not all the embodiments.

[0045] It should be noted that the brief description of the terms in this application is only for the convenience of understanding the embodiments described next, and is not intended to limit the embodiments of the application. Unless otherwise specified, these terms should be understood according to their ordinary and general meanings.

[0046] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclusive inclusion, for example, a product or device including a series of components does not have to be limited to the clearly listed components, but can include other components that are not clearly listed or inherent to these products or devices.

[0047] In order to facilitate understanding, first, the architecture of the laser projection device and the imaging principle are exemplarily described.

[0048] Figure 1 It is a structural schematic diagram of a laser projection device. As shown in the figure, after the upper shell of the laser projection device is disassembled, the internal structure is divided according to the optical function, which can include a laser light source 100, an optical machine 200, and a projection lens 300. Figure 1

[0049] Among them, the optical machine 200 can include light modulation components, such as light rods, relay lenses, phase light modulator devices (PLM), and amplitude modulation devices. The phase modulation device plays a role in shaping and homogenizing the laser, and the amplitude light modulation component is the core component of the laser projection device. The amplitude light modulation component (also called light valve) can be divided into transmissive liquid crystal display (LCD), liquid crystal on silicon (LCOS), and digital micro mirror device (DMD) chip. Among them, the DMD chip is applied to the DLP projection architecture.

[0050] The laser light source 100 is used to provide a light source illumination beam. The laser light source 100 can include at least one color laser, such as a blue laser, or a dual-color laser, such as a blue laser and a red laser, or a three-color laser light source including a red (RED, R), green (Green, G), and blue (Blue, B) laser, used to provide a three-color laser illumination beam.

[0051] ​Take a three-color laser light source as an example. Generally, in a laser projection device without a PLM, the lasers of the three-color laser light source sequentially emit RGB three colors, and sequentially irradiate the amplitude modulation device. Take the amplitude light modulation device as a DMD as an example. The DMD sequentially receives three video image signals corresponding to the RGB three-color laser beams in a time sequence consistent with the emission time sequence of the three-color laser beams, and flips the surface of tens of thousands of micro-mirrors of the DMD according to the corresponding video image signals to realize positive angle or negative angle flipping. The laser beams irradiated onto the surface of the DMD are reflected into the projection lens 300, and then the laser beams irradiated onto the DMD are amplitude modulated according to the laser beams, so as to realize projection imaging. That is, when the red laser beam irradiates onto the DMD, the DMD amplitude modulates the red laser beam according to the video image signal corresponding to the red laser beam, and so on. In the above laser projection process, although the three laser beams corresponding to a complete frame of image are sequentially emitted, the sequential emission speed is relatively fast, and the human eye has the visual persistence characteristic, so that the laser projection device can realize the display of the image to be projected.

[0052] In a laser projection device with a PLM, the lasers of the three-color laser light source sequentially emit RGB three colors, and sequentially irradiate the PLM. Similarly, the PLM sequentially receives three video image signals corresponding to the RGB three-color laser beams in a time sequence consistent with the emission time sequence of the three-color laser beams, and then amplitude modulates the laser beams irradiated onto the PLM according to the laser beams. Then, the laser beams after the phase modulation are emitted onto the DMD to perform amplitude modulation, and then the subsequent laser projection step is completed.

[0053] In some scenarios, a user can play a video using a laser projection device (for example, a laser television), and the DLP end (which can also be referred to as a DLP component or a DLP) of the laser projection device can turn on the dynamic contrast switch (which can also be referred to as turning on the dynamic dimming or turning on the dimming) when the video is played. By calculating and processing the gray level histogram of the picture display, the display brightness of the picture is adjusted in real time, and the display effect of the picture is improved.

[0054] In order to ensure that the high-light area and the low-light area in the displayed picture have good distinguishability, the DLP end sets the DMD to fully open when the high-light area of the picture is in the dynamic contrast switch, and controls the DMD to reflect the excess light in the low-light area to enhance the contrast of the picture, so as to achieve a high-contrast display effect. In the embodiments of the present application, the picture can also be referred to as a display picture, an image, a display image, etc., and the embodiments of the present application do not distinguish between them.

[0055] The process of adjusting the picture when the DLP end turns on the dynamic contrast switch when the video is played will be described below:

[0056] When the DLP end receives the video signal transmitted by the master control chip, the DLP end can count the gray scale information of each pixel point in the full screen of each frame of image in the decoded video signal to obtain a gray scale histogram. The DLP end can obtain a probability distribution curve of the pixel points under different gray scales based on the gray scale histogram of the image displayed at the current time, and calculate a gray scale mapping function F. When the DLP end determines the gray scale mapping function F, the gray scale value of each pixel point is gain-processed according to the gray scale mapping function F to obtain a new gray scale value of each pixel point after processing, the pixel point is mapped to the new gray scale value, and an adjusted picture is obtained.

[0057] In some pictures, as shown in FIG. 1, the picture includes an image region and a subtitle region, and in the calculation of the gray scale mapping function F, the brightness of the subtitle region and the brightness of the image region are calculated together. Since the subtitle is usually white and has high brightness, the calculated gray scale mapping function F is large, especially in some pictures showing dark scenes. After the dynamic contrast of the DLP end is turned on, the brightness of the picture is raised due to the high brightness requirement of the subtitle region, and the visual effect of the picture shows that the subtitle region is too bright and the image region is too dark, and the display effect of the picture is poor. Figure 2

[0058] To reduce the influence of the subtitle region on the display effect of the picture, the master control chip can decode the video signal when transmitting the video signal to the DLP end, obtain the position information of the subtitle in the video signal, and send the decoded video signal and the position information of the subtitle to the DLP end. When the DLP end receives the video signal and the position information of the subtitle in the video signal sent by the master control chip, the target display region excluding the subtitle can be determined from the video signal according to the position information. When the DLP end performs dynamic contrast processing, the range of the dynamic contrast processing can be limited to the target display region, which can effectively avoid the influence of the high brightness requirement of the subtitle region on the overall brightness of the picture, thereby improving the display effect of the picture.

[0059] In some scenes, the DLP end can adjust the display picture of the laser projection device (for example, perform geometric correction, digital zoom, and the like, adjust the size of the picture), perform display picture entry, or other intelligent display adjustment related to the user.

[0060] In this scenario (hereinafter taking geometric correction as an example), after the DLP end receives the video signal transmitted by the master control chip, the video signal is decoded, the decoded video signal and image information such as screen parameters are re-encoded with the geometric correction control point coordinates, and the video signal stream matching the display region after geometric correction is converted. Subsequently, the dynamic contrast processing is realized by judging and processing the single frame image information in the video signal stream. ​

[0061] In scenarios where the video signal transmitted by the main control chip contains the position information of subtitles, if this position information is not processed by geometric correction before encoding, it will differ from the coordinates of the border points in the geometrically corrected encoded video signal stream. If the position information decoded by the main control chip is directly applied to dynamic contrast processing, an error in the display area of ​​dynamic contrast processing will occur (i.e., the display area for contrast processing may include the subtitle area), causing dynamic contrast processing (dimming processing) to fail and the display effect of the picture to be poor.

[0062] In view of this, embodiments of this application provide a laser projection device and a display method. When performing dynamic contrast processing on the display screen, if the main control chip determines that the laser projection device has enabled functions such as geometric correction to adjust the screen, the main control chip can perform mapping correction processing on the position information of the subtitles in the video signal according to the position coordinates of the display area after the screen adjustment, so that the display area determined by the position information when the DLP performs dynamic contrast processing does not include the subtitle area, thereby improving the display effect of the screen.

[0063] The technical solutions of this application will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. In the description of this application, unless otherwise expressly specified and limited, the terms should be broadly understood within the art. The embodiments of this application will now be described with reference to the accompanying drawings.

[0064] Figure 3 This is a schematic diagram of the structure of a laser projection device 30 provided in an embodiment of this application, as shown below. Figure 3 As shown, the laser projection device 30 includes a main control chip 301, a display driver component 302, a light modulation component 303, and a light source component 304.

[0065] The main control chip 301 is used to receive externally input video signals.

[0066] Optionally, the main control chip 301 can also generate video signals based on external video sources. For example, the external video source can be a network video source, a High Definition Multimedia Interface (HDMI) video signal, or a video source in a storage medium such as a hard disk.

[0067] First, combine Figure 3 The structure of the laser projection device 30 shown is illustrated, and the process of dynamic contrast processing of the laser projection device 30 without geometric correction is explained.

[0068] In some embodiments, when the master chip 301 acquires the video signal, the master chip 301 can decode the video signal, acquire the position information of the subtitles in the video signal, and send the decoded video signal and the position information of the subtitles to the display driving component 302. The decoded video signal can be a V-By-One signal developed for image transmission, or a Low Voltage Differential Signaling (LVDS) signal, etc.

[0069] For example, the master chip 301 can decode the video signal, acquire the video stream and the subtitle stream in the video signal, and determine the position information of the subtitles in the video signal according to the video stream and the subtitle stream by using a preset algorithm. The preset algorithm can be a block matching algorithm, a Harris corner point extraction algorithm, etc.

[0070] In some embodiments, the position information of the subtitles in the video signal can be the position coordinates of the area where the subtitles are located. When the master chip 301 identifies the subtitles in the video signal, the master chip 301 can take the position coordinates of the area where the subtitles are located as the position information of the subtitles. For example, as shown in Figure 4 When the master chip 301 identifies the subtitles in the lower part of the image, the master chip 301 can take the area where the subtitles are located in the image as the subtitle area, and extract the position coordinates of the area as the position information of the subtitles.

[0071] When the master chip 301 acquires the position information of the subtitles in the video signal, the master chip 301 can send the video signal and the position information of the subtitles in the video signal to the display driving component 302.

[0072] The display driving component 302 is connected to the master chip 301. When the display driving component 302 receives the video signal and the position information of the subtitles in the video signal sent by the master chip 301, the display driving component 302 can determine the target display area from the video signal according to the position information. The target display area is the area in the image included in the video signal except the subtitles.

[0073] For example, continuing to refer to Figure 2 , the display driving component 302 determines the subtitle area as the area where m*b of the entire image is located according to the position information, and the corresponding target area (image area) is the area where (n-b)*m is located.

[0074] When the display driving component 302 determines the target display area, the display driving component 302 can perform contrast processing on the image data in the target display area to optimize the display effect of the image.

[0075] For example, the display driving component 302 can acquire the gray scale information of the pixels in the target display region, and determine the image gain of the pixels based on the gray scale information; and perform contrast processing on the image data in the target display region according to the image gain, to obtain the optimized image data.

[0076] The gray scale information of the pixels can include the gray scale values of the pixels, and the display driving component 302 can determine the gray scale histogram of the image data in the target display region according to the acquired gray scale values of the pixels, and determine the image gain (also referred to as the gray scale gain) of each pixel based on the gray scale histogram.

[0077] After the display driving component 302 acquires the gray scale values of each pixel of the image in the target region, the display driving component 302 can obtain the gray scale histogram of the image in the target region according to the gray scale values of each pixel, and calculate the image gain F1 of each pixel according to the gray scale histogram using an image processing algorithm. The image processing algorithm can be an edge operator algorithm, a histogram equalization algorithm, etc., which is not limited in the embodiments of the present application.

[0078] The display driving component 302 processes each pixel of the image data according to the acquired image gain, to obtain the gray scale values of each pixel after gain, and maps the gray scale values of each pixel after gain to the corresponding pixels, to obtain the first image data.

[0079] For the subtitle region, the display driving component 302 can acquire the brightness information of the pixels in the subtitle region; and set the brightness of the pixels in the subtitle region to a target brightness according to the brightness information, to obtain the second image data. The brightness information of the pixels in the subtitle region can be the brightness values of the pixels, and the target brightness can be determined based on prior knowledge. Optionally, the target brightness is lower than the current brightness of the subtitle region.

[0080] After the display driving component 302 determines the first image data and the second image data, the display driving component 302 can combine the first image data and the second image data, to obtain the optimized target image data.

[0081] The display driving component 302 is connected with the light modulation component 303 and the light source component 304. After the display driving component 302 determines the target image data, the display driving component 302 can control the light source component to emit the primary color light matched with the target image data based on the target image data. In addition, after the display driving component 302 determines the target image data, the display driving component 302 can control the light modulation component to modulate the primary color light emitted by the light source component after the light source component is lit, to realize image display.

[0082] In some embodiments, as shown in FIG. 3, the display driving component 302 can acquire the gray scale information of the pixels in the target display region, and determine the image gain of the pixels based on the gray scale information. Figure 4 The display driving component 302 can perform contrast processing on the image data in the target display region according to the image gain, to obtain the optimized image data. Figure 3 The display driving component 302 can acquire the brightness information of the pixels in the subtitle region, and set the brightness of the pixels in the subtitle region to a target brightness according to the brightness information, to obtain the second image data. Figure 3Based on the illustrated laser projection device, the laser projection device 30 further comprises a laser driving assembly 305, an optical engine 306 and a power supply assembly 307.

[0083] The main control chip 301 is connected with the display driving assembly 302 and the power supply assembly 307; the display driving assembly 302 is connected with the light modulation assembly 303, the laser driving assembly 305, the main control chip 301 and the power supply assembly 307; the laser driving assembly 305 is connected with the light source assembly 304 and the display driving assembly; the light modulation assembly 303 is connected with the optical engine 306 and the display driving assembly 302; the light source assembly 304 is connected with the laser driving assembly 305, the optical engine 306 and the power supply assembly 307; and the optical engine 306 is connected with the light source assembly 304 and the light modulation assembly 303.

[0084] The laser driving assembly 305 is configured to send a driving signal to the light source assembly 304 to drive the light source assembly 304 to emit primary color light.

[0085] The optical engine 306 is configured to transmit the primary color light emitted by the light source assembly 304 to the light modulation assembly 303, i.e., the optical engine 306 is a light transmission channel between the light source assembly 304 and the light modulation assembly 303.

[0086] The power supply assembly 307 is configured to provide power support for the operation of the main control chip 301, the display driving assembly 302 and the light source assembly 304.

[0087] In some embodiments, the display driving assembly 302 can send a synchronization signal to the laser driving assembly 305 according to the target image data, and send a display driving signal to the light modulation assembly 303 according to the target image data.

[0088] When the laser driving assembly 305 receives the synchronization signal, the laser driving assembly 305 can generate a light source driving signal according to the synchronization signal, and send the light source driving signal to the light source assembly 304 to drive the light source assembly 304 to emit primary color light. The light source driving signal can be transmitted in a first time sequence.

[0089] In some embodiments, the synchronization signal comprises an enable signal and a pulse width modulation (PWM) signal. The enable signal can be a timing control signal, which can be represented as X_EN, where X represents the abbreviation of different primary color light. The enable signal is used to coordinate the timing of different color light output. The PWM signal is a square wave signal used to provide a current signal for the light source assembly 304 to emit light. The display driving assembly 302 can determine the enable signal and the PWM signal according to the video signal.

[0090] The light source assembly 304 includes three-color lasers, i.e., lasers of red, green and blue colors. If the first timing sequence is R-G-B cycle, the light source assembly 304 performs three-color laser illumination of the light beams in the order of red light-green light-blue light through the three-color lasers.

[0091] When the light modulation assembly 303 receives the display driving signal, the micro-mirrors in the light modulation assembly 303 are controlled to move or flip to corresponding angles according to the display driving signal, so as to modulate the primary color light emitted by the light source assembly 304 after being lit, and perform image display.

[0092] In some embodiments, the display driving signal can be transmitted according to a second timing sequence. For example, if the second timing sequence is R-G-B cycle (i.e., red light-green light-blue light cycle, where R represents red light, G represents green light, and B represents blue light), the light modulation assembly 303 performs image display in the order of red light-green light-blue light.

[0093] In some embodiments, the display driving assembly 302 further includes a memory 3021. The memory 3021 is configured to store the target image data processed by the display driving assembly 302.

[0094] When processing the image data in the received video signal, the display driving assembly 302 can process the image frame by frame. The display rate of the light modulation assembly 303 can be lower than the image optimization rate of the display driving assembly 302. The display driving assembly 302 can store the un-displayed images in the memory 3021.

[0095] In some embodiments, the display driving signal can be a high-speed serial interface (HSSI) differential signal.

[0096] In some embodiments, the master control chip 301 can be a system on chip (SOC).

[0097] In some embodiments, the display driving assembly 302 can be a DLP.

[0098] In some embodiments, the light modulation assembly 303 can be a DMD.

[0099] The above describes the process of adjusting the display image by the laser projection device without geometric correction. The following describes the process of adjusting the display image by the laser projection device with geometric correction during display. Figure 5 The above describes the process of adjusting the display image by the laser projection device without geometric correction. The following describes the process of adjusting the display image by the laser projection device with geometric correction during display.

[0100] Figure 5Flowchart of a display method provided by an embodiment of the present application Figure 1 As shown in Figure 5 includes the following steps:

[0101] S501, in a case where a picture of a video stream includes subtitles and the brightness of the picture is less than a preset brightness, the master control chip performs dimming processing on a first picture of the video stream by the display driving component, and displays a second picture of the video stream after dimming processing.

[0102] In some embodiments, the master control chip can analyze a video stream (also referred to as a video signal) to be played, determine that subtitles appear in a picture included in the video stream, and in a case where the brightness of the picture is less than a preset brightness, determine that the current playing picture is a picture with subtitles in a dark scene, and perform dimming processing on the picture to improve the display effect of the picture. The specific implementation manner can refer to the implementation manner shown in the above Figure 3 , which will not be described here again.

[0103] The second picture can be a picture with the same content as the first picture. The brightness of the subtitle area of the second picture after dimming processing is less than the brightness of the subtitle area of the first picture before dimming processing.

[0104] In some embodiments, dimming processing can be a function that is enabled by default by a laser projection device, or the laser projection device performs dimming processing on a video stream to be played when receiving a dimming processing enabling instruction of a user. For example, when the master control chip obtains a video stream, it can detect whether the dimming processing (for example, whether the dimming mode is turned on) function is enabled, and if the function is enabled, perform dimming processing on a picture of the video stream in a case where the picture includes subtitles and the brightness of the picture is less than a preset brightness. Alternatively, the master control chip can receive an instruction of a user to enable dimming processing (for example, receive an instruction of a user to turn on a dimming mode through a remote controller) during playing of a video stream, and perform dimming processing on a picture of a subsequent video stream in a case where the picture includes subtitles and the brightness of the picture is less than a preset brightness.

[0105] In some embodiments, the master control chip obtains a second picture after the display driving component performs dimming processing on a first picture, and accordingly, the display driving component can adjust a first control current for displaying the first picture to a second control current for displaying the second picture, where the first control current is greater than the second control current.

[0106] S502, in response to a picture adjustment instruction, the master control chip performs picture adjustment processing on a second picture of the video stream by the display driving component, and displays a third picture of the video stream after picture adjustment.

[0107] The third brightness of the subtitle area of the third picture is less than the brightness threshold value from the brightness of the subtitle area of the second picture. The picture adjustment instruction includes a geometric correction instruction and / or a focal length adjustment instruction. The third picture can be a picture with the same content as the second picture, or a subsequent picture in the video stream, and the embodiments of the present application do not limit this.

[0108] In the display process of the dimming processing, when the host chip receives the picture adjustment instruction, in order to ensure that the dimming processing is not invalid, the host chip can determine the display area that needs to be processed by dimming after the picture adjustment processing based on the change relationship between the current display area and the display area after the picture adjustment, and process the display area that needs to be processed by dimming by the display driving component, thereby avoiding the problem that the display area that needs to be processed by dimming deviates due to picture adjustment, the dimming processing is invalid, and the display effect is affected.

[0109] For example, as shown in Figure 6 The host chip can determine the display area (dimming area) that needs to be processed by dimming based on the position of the subtitle area. After the picture adjustment, the display area deviates. If the dimming area is not adjusted and the original area is still processed, the area may include the subtitle area, which introduces the brightness of the subtitle area in the dimming calculation process, thereby causing deviation in the calculation, invalidating the dimming processing, and affecting the display effect.

[0110] In some embodiments, the host chip can determine the dimming area after the picture adjustment according to the steps as follows:

[0111] S1, obtaining a first display area displaying the second picture, a first target display area, and a second display area displaying the third picture.

[0112] The first target display area is the area of the second picture except the subtitle area, that is, the dimming area before the picture adjustment. The first display area is the display area before the picture adjustment, and the second display area is the display area after the picture adjustment.

[0113] The host chip can determine the first display area and the second display area based on the screen parameters (for example, image parameters collected when geometric correction is performed) when the display area component performs picture adjustment, and determine the first target display area based on the subtitle area in the second picture.

[0114] S2, determine a second target display area according to the first display area, the first target display area, and the second display area, and send image data of the third picture and the second target display area to the display driving component, so that the display driving component displays the third picture based on the image data and the second target display area; the second target display area is an area in the third picture except a subtitle area.

[0115] In some embodiments, when the master chip determines the first display area and the second display area, a mapping relationship when the first display area is changed to the second display area can be obtained, the first target display area is mapped based on the mapping relationship, and the second target display area is determined.

[0116] For example, as shown in the figure, taking geometric correction as an example, assuming that the coordinates of the first display area are (0, 0), (0, y), (x, 0), (x, y), and there is an offset (x1, y1) in the x and y directions after geometric correction, the coordinates of the second display area are (x1, y1), (x1, y2), (x2, y1), (x2, y2), where 0 < x1 < x2 < x; 0 < y1 < y2 < y. Figure 7

[0117] Assuming that the coordinates of the first target display area are (x a ,y m ), (x a ,y n ), (x b ,y m ), (x b ,y n ), and the coordinates of the second target display area are (x a ′,y m ′), (x a ′,y n ′), (x b ′,y m ′), (x b ′,y n ′), since the size of the first target display area is consistent with the size of the second target display area, the coordinates of the first target display area and the second target display area have the following relationship:

[0118]

[0119] From the above formula, it can be known that the horizontal coordinates of the first target display area and the horizontal coordinates of the second target display area can have the following first mapping relationship:

[0120]

[0121] ​wherein x i is the horizontal coordinate of the second target display area, x i is the horizontal coordinate of the first display area.

[0122] The horizontal coordinate of the first target display area and the vertical coordinate of the second target display area can have a second mapping relationship as follows:

[0123]

[0124] wherein y i is the vertical coordinate of the second target display area, y i is the vertical coordinate of the first display area.

[0125] When determining the first mapping relationship and the second mapping relationship, the master control chip can perform mapping processing on the horizontal coordinate of the first target display area according to the first mapping relationship to obtain the horizontal coordinate of the second target display area; and perform mapping processing on the vertical coordinate of the first target display area according to the second mapping relationship to obtain the vertical coordinate of the second target display area.

[0126] For example, as shown in FIG. 6, the coordinates of the second target display area can be as follows: Figure 7

[0127]

[0128]

[0129] When determining the coordinates of the second target display area, the master control chip can send the coordinates of the second target display area and the image data of the third picture to the display driving component. After receiving the coordinates of the second target display area and the image data of the third picture, the display driving component limits the area of dimming processing in the second target display area when performing dimming processing on the third picture, thereby solving the problem that the position of the dynamic dimming area is adjusted due to the change of the coordinates of the display area when the picture after geometric correction is dynamically dimmed, which causes the dimming effect to fail, thereby improving the display effect. It should be understood that the process of dimming processing performed by the display driving component is similar to that of the embodiment shown in FIG. 5, and thus will not be described here again. Figure 3

[0130] It should be understood that when performing dynamic dimming processing on the image in the video stream after geometric correction, the dimming area is accurately determined based on the coordinate offset of geometric correction. Therefore, the brightness of the dimming area and the subtitle area after geometric correction is the same as or similar to that before geometric correction. Correspondingly, the size of the second control current for controlling the second picture and the third control current for controlling the third picture is also the same or similar.

[0131] ​​Figure 8 Another exemplary display method provided by the embodiments of the present application is shown in the flowchart as follows. Figure 8 The method comprises the following steps:

[0132] S801, the master chip receives a video stream.

[0133] S802, the master chip determines whether a dynamic dimming function is enabled. If the dynamic dimming function is enabled, the method proceeds to S803. If the dynamic dimming function is not enabled, the method ends.

[0134] S803, the master chip determines whether the current video stream meets a dynamic dimming condition. If the current video stream meets the dynamic dimming condition, the method proceeds to S804. If the current video stream does not meet the dynamic dimming condition, the method proceeds to S808.

[0135] The dynamic dimming condition can mean that a picture of the video stream includes subtitles and the brightness of the picture is less than or equal to a target brightness.

[0136] S804, the master chip determines whether a geometric correction operation has been performed. If the geometric correction operation has been performed, the method proceeds to S805. If the geometric correction operation has not been performed, the method proceeds to S806.

[0137] S805, the master chip obtains coordinates of a second target display area.

[0138] The step of obtaining the coordinates of the second target display area can refer to the implementation in the embodiment shown in Figure 5 and will not be described here again.

[0139] S806, the master chip obtains coordinates of a first target display area.

[0140] The step of obtaining the coordinates of the first target display area can refer to the implementation in the embodiment shown in Figure 3 and will not be described here again.

[0141] S807, the master chip transmits the coordinates of the first target display area or the coordinates of the second target display area and the video stream to a display driving component.

[0142] S808, the master chip transmits the video stream to the display driving component.

[0143] S809, the display driving component performs dynamic dimming processing.

[0144] In some embodiments, when the display driving component receives the coordinates of the second target display region, the image data corresponding to the or the second target display region can be subjected to contrast processing to obtain first target image data; the brightness of the image data corresponding to the region except the second target display region is set to a target brightness to obtain second target image data; and the third image is displayed according to the first target image data and the second target image data. The implementation of obtaining the first target image data can refer to the implementation of obtaining the first target image data in the embodiments shown in Figure 3 The implementation principle and technical effects of the display method provided in the embodiments are similar to those of the embodiments shown in

[0145] The implementation principle and technical effects of the display method provided in the embodiments are similar to those of the embodiments shown in Figure 3 and Figure 5 The implementation principle and technical effects of the display method provided in the embodiments are similar to those of the embodiments shown in

[0146] On the basis of the above-mentioned embodiments, the display device provided in the embodiments of the present application is further provided.

[0147] Figure 9 The structural schematic diagram of a display device 90 provided in the embodiments of the present application is shown in Figure 9 and includes:

[0148] The first display module 901 is configured to, in the case that the picture of the video stream includes subtitles and the brightness of the picture is less than a preset brightness, perform dimming processing on the first picture of the video stream, and display the second picture of the video stream after the dimming processing; the brightness of the subtitle area of the second picture is less than the brightness of the subtitle area of the first picture.

[0149] The second display module 902 is configured to, in response to a picture adjustment instruction, perform picture adjustment processing on the second picture of the video stream, and display the third picture of the video stream after the picture adjustment; the difference between the third brightness of the subtitle area of the third picture and the brightness of the subtitle area of the second picture is less than a brightness threshold; and the picture adjustment instruction includes a geometric correction instruction and / or a focal length adjustment instruction.

[0150] In some embodiments, the first display module 901 is further configured to, after performing the dimming processing on the first picture, adjust the first control current for displaying the first picture to a second control current for displaying the second picture; and the first control current is greater than the second control current.

[0151] In some embodiments, the second display module 902 is further configured to, after performing the picture adjustment processing on the second picture, adjust the second control current for displaying the second picture to a third control current for displaying the third picture; and the difference between the second control current and the third control current is less than a current threshold.

[0152] In some embodiments, the second display module 902 is further configured to acquire a first display area of the second picture, a first target display area, and a second display area of the third picture; the first target display area is an area of the second picture excluding a subtitle area; determine a second target display area according to the first display area, the first target display area, and the second display area, and send the second target display area and image data of the third picture to the display driving component, so that the display driving component displays the third picture based on the image data and the second target display area; the second target display area is an area of the third picture excluding a subtitle area.

[0153] In some embodiments, the second display module 902 is further configured to acquire a mapping relationship between the first display area and the second display area; map the first target display area according to the mapping relationship to determine the second target display area.

[0154] In some embodiments, the second display module 902 is further configured to determine a first mapping relationship according to the horizontal coordinates of the first display area and the horizontal coordinates of the second display area; determine a second mapping relationship according to the vertical coordinates of the first display area and the vertical coordinates of the second display area; map the horizontal coordinates of the first target display area according to the first mapping relationship to obtain the horizontal coordinates of the second target display area; map the vertical coordinates of the first target display area according to the second mapping relationship to obtain the vertical coordinates of the second target display area.

[0155] In some embodiments, the second display module 902 is further configured to perform contrast processing on image data corresponding to the or second target display area to obtain first target image data; set the brightness of image data corresponding to an area other than the second target display area to a target brightness to obtain second target image data; and display the third picture according to the first target image data and the second target image data.

[0156] In some embodiments, the first display module 901 is further configured to receive a dimming instruction or detect that a dimming mode is turned on, and perform dimming processing on the first picture of the video stream through the display driving component.

[0157] The display device provided in the present application is used to execute the display method provided in any of the foregoing embodiments, and has similar implementation principles and technical effects, which will not be described herein.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0159] The foregoing description has been set forth in conjunction with a particular embodiment and implementations, for purposes of convenience and illustration. However, the foregoing discussion is not intended to be exhaustive or to limit the embodiments to the precise forms disclosed. Various modifications and changes are possible in light of the teachings above. The selection and arrangement of various elements described or claimed in the foregoing embodiments are presented to provide the best description possible of the principles and the practical applications of the embodiments. It is intended that the described embodiments be considered as illustrative only and that the scope of the embodiments be determined not with reference to the foregoing description but with reference to the claims.

Claims

1. A laser projection device, characterized by, The laser projection device comprises a master control chip and a display driving component, the master control chip is configured to: In the case that the picture of the video stream comprises a subtitle and the brightness of the picture is less than a preset brightness, the display driving component is configured to perform dimming processing on a first picture of the video stream, and display a second picture of the video stream after the dimming processing; the brightness of a subtitle area of the second picture is less than the brightness of a subtitle area of the first picture; In response to a picture adjustment instruction, the display driving component is configured to perform picture adjustment processing on a second picture of the video stream, and display a third picture of the video stream after the picture adjustment processing; a difference between the third brightness of the subtitle area of the third picture and the brightness of the subtitle area of the second picture is less than a brightness threshold; the picture adjustment instruction comprises a geometric correction instruction and / or a focal length adjustment instruction.

2. The laser projection device of claim 1, wherein, The display driving component is configured to: After the dimming processing on the first picture, a first control current for displaying the first picture is adjusted to a second control current for displaying the second picture; the first control current is greater than the second control current; After the picture adjustment processing on the second picture, the second control current for displaying the second picture is adjusted to a third control current for displaying the third picture; a difference between the second control current and the third control current is less than a current threshold.

3. The laser projection device according to claim 1 or 2, characterized in that, The master control chip is configured to: obtain a first display area for displaying the second picture, a first target display area, and a second display area for displaying the third picture; the first target display area is an area of the second picture except the subtitle area; determine a second target display area according to the first display area, the first target display area, and the second display area, and send the second target display area and image data of the third picture to the display driving component, so that the display driving component displays the third picture based on the image data and the second target display area; the second target display area is an area of the third picture except the subtitle area.

4. The laser projection device of claim 3, wherein, The master control chip is configured to: obtain a mapping relationship between the first display area and the second display area; map the first target display area according to the mapping relationship to determine the second target display area.

5. The laser projection device of claim 4, wherein, The master control chip is configured to: determine a first mapping relationship according to the horizontal coordinates of the first display area and the horizontal coordinates of the second display area; determine a second mapping relationship according to the vertical coordinates of the first display area and the vertical coordinates of the second display area; perform mapping processing on the horizontal coordinates of the first target display area according to the first mapping relationship to obtain the horizontal coordinates of the second target display area; perform mapping processing on the vertical coordinates of the first target display area according to the second mapping relationship to obtain the vertical coordinates of the second target display area.

6. The laser projection device of claim 3, wherein, The display driving component is configured to: perform contrast processing on the image data corresponding to the or second target display area to obtain first target image data; The brightness of image data corresponding to a region except the second target display region is set as a target brightness, to obtain second target image data; The third image is displayed according to the first target image data and the second target image data.

7. The laser projection device of claim 1, wherein, The master control chip is configured to: After receiving a dimming instruction or detecting that a dimming mode is turned on, the display driving assembly performs dimming processing on the first picture of the video stream.

8. A display method characterized by comprising: The method comprises: In a case where a picture of a video stream includes a subtitle and the brightness of the picture is less than a preset brightness, performing dimming processing on a first picture of the video stream, and displaying a second picture of the video stream after the dimming processing; The brightness of a subtitle region of the second picture is less than the brightness of a subtitle region of the first picture; In response to a picture adjustment instruction, performing picture adjustment processing on a second picture of the video stream, and displaying a third picture of the video stream after the picture adjustment processing; the third brightness of the subtitle region of the third picture and the brightness of the subtitle region of the second picture have a difference less than a brightness threshold; the picture adjustment instruction includes a geometric correction instruction and / or a focal length adjustment instruction.

9. The method of claim 8, wherein, The method further comprises: After the dimming processing on the first picture, a first control current for displaying the first picture is adjusted to a second control current for displaying the second picture; the first control current is greater than the second control current; After the picture adjustment processing on the second picture, the second control current for displaying the second picture is adjusted to a third control current for displaying the third picture; the difference between the second control current and the third control current is less than a current threshold.

10. The method of claim 8, wherein, The method further comprises: A first display region displaying the second picture, a first target display region, and a second display region displaying the third picture are obtained; the first target display region is a region of the second picture except a subtitle region; According to the first display region, the first target display region, and the second display region, a second target display region is determined, and image data of the third picture and the second target display region are sent to the display driving assembly, so that the display driving assembly displays the third picture based on the image data and the second target display region; the second target display region is a region of the third picture except a subtitle region.

Images