Laser television and local backlight adjusting method thereof

Abstract

The embodiment of the invention belongs to the technical field of display, and provides a laser television and a local backlight adjusting method of the laser television, and a display driving assembly is used for sending a synchronizing signal to a laser driving assembly and a phase light modulation module according to a video signal and sending a display driving signal to a light modulation assembly. The laser driving assembly is used for sending a light source driving signal to the light source assembly according to the synchronizing signal to drive the light source assembly to emit primary light. The video processing assembly is used for sending a phase video signal to the phase light modulation module according to a video signal, the phase light modulation module is used for carrying out phase light modulation according to the phase video signal and a synchronization signal so as to emit modulated light to the light modulation assembly, and the light modulation assembly is used for displaying an image based on the modulated light. The phase light modulation module is also used for correcting the bias voltage corresponding to the subsequent primary light according to the bias voltage. According to the invention, redistribution of light energy is realized in space, the accuracy of improvement of peak brightness is improved, and the light energy efficiency is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology, and more specifically, to a laser television and a method for adjusting the local backlight of the laser television. Background Art

[0002] Laser TVs are limited by the form of the light source and cannot adjust the brightness of the lamp beads by area like LCD TV backlights to achieve local adjustment of the backlight and high-dynamic range (HDR).

[0003] At present, in order to achieve local backlight adjustment, laser equipment adds additional light modulation components, so that the light source output is first modulated by the first light modulation component and then irradiated to the second light modulation component for modulated display.

[0004] However, in the above method, after being modulated by the first light modulation component, the light in the dark field is discarded, and only the light in the bright field is reflected to the second light modulation component for display. That is, the high dynamic range display effect is achieved by greatly reducing the dark field brightness, which makes it impossible to increase the peak brightness and has low light energy efficiency. Summary of the invention

[0005] The embodiments of the present application provide a laser TV and a local backlight adjustment method for a laser TV, which are used to solve the problems in the related art that the peak brightness cannot be increased when performing local backlight adjustment and the light energy efficiency is low.

[0006] In a first aspect, an embodiment of the present application provides a laser TV, the laser TV comprising: a main control chip, a display driving component, a light modulation component, a light source component, a laser driving component, a phase light modulation module and a video processing component;

[0007] The main control chip is used to generate a video signal according to an external video source;

[0008] The display driving component is connected to the light modulation component, the laser driving component and the phase light modulation module respectively, and the display driving component is used to obtain the video signal, and send a synchronization signal to the laser driving component and the phase light modulation module according to the video signal, and send a display driving signal to the light modulation component according to the video signal;

[0009] The laser driving component is connected to the light source component, and the laser driving component is used to send a light source driving signal to the light source component according to the synchronization signal to drive the light source component to light up and emit primary color light;

[0010] The video processing component is connected to the main control chip and the phase light modulation module respectively; the video processing component is used to send a phase video signal to the phase light modulation module according to the video signal;

[0011] The phase light modulation module is used to determine a bias voltage according to the synchronization signal; and to perform phase light modulation on the primary color light according to the phase video signal and the bias voltage, so as to emit modulated light to the light modulation component;

[0012] The light modulation component is used to display an image based on the modulated light;

[0013] The phase light modulation module includes a control component, which is used to obtain the bias voltage and perform voltage correction on a target voltage corresponding to subsequent primary color lights according to the bias voltage. The corrected target voltage is used to determine the bias voltage corresponding to the subsequent primary color lights.

[0014] In the embodiment of the present application, the display driving component is used to obtain the video signal, and send a synchronization signal to the laser driving component and the phase light modulation module according to the video signal, and at the same time, send a display driving signal to the light modulation component according to the video signal. The laser driving component is used to send a light source driving signal to the light source component according to the synchronization signal to drive the light source component to light up and emit primary color light. The video processing component is used to send a phase video signal to the phase light modulation module according to the video signal. The phase light modulation module is used to determine the bias voltage according to the synchronization signal, and phase light modulate the primary color light according to the phase video signal and the bias voltage to emit the modulated light to the light modulation component. The light modulation component is used to display an image based on the modulated light. The phase light modulation module includes a control component. The control component is used to obtain the bias voltage and perform voltage correction on the target voltage corresponding to the subsequent primary color light according to the bias voltage. The corrected target voltage is used to determine the bias voltage corresponding to the subsequent primary color light to achieve closed-loop control, thereby achieving more accurate bias voltage setting, so that when realizing local backlight adjustment, the light energy is redistributed in space, the accuracy of peak brightness increase and dark field brightness reduction is improved, and the light energy efficiency is improved.

[0015] In some embodiments of the present application, the synchronization signal includes an enable signal and a PWM signal;

[0016] The phase light modulation module further includes: a phase light modulation device and a dimming driving module;

[0017] The dimming driving module is connected to the phase light modulation device, and the dimming driving module is used to:

[0018] Determining the bias voltage according to the enable signal;

[0019] A dimming drive signal is sent to the phase light modulation device according to the phase video signal, the PWM signal and the enable signal, wherein the dimming drive signal includes the bias voltage.

[0020] In an embodiment of the present application, a dimming drive signal is sent to a phase light modulation device through a dimming drive module in the phase light modulation module to drive the phase light modulation device to perform phase light modulation according to the dimming drive signal, so as to emit modulated light to the light modulation component, thereby realizing spatial redistribution of light energy, and achieving an increase in peak brightness and a reduction in dark field brightness.

[0021] In some embodiments of the present application, the dimming driving module includes: a dimming driving component and a bias voltage conversion circuit;

[0022] The display driving component is connected to the dimming driving component and the bias voltage conversion circuit respectively; the display driving component is specifically used for:

[0023] Sending the synchronization signal to the dimming driving component;

[0024] sending the enable signal to the bias voltage conversion circuit;

[0025] Performing digital-to-analog conversion on the PWM signal to obtain a converted PWM signal;

[0026] Sending the converted PWM signal and the enable signal to the laser driving component;

[0027] The laser driving component is specifically used to generate the light source driving signal according to the converted PWM signal and the enable signal;

[0028] The bias voltage conversion circuit is connected to the phase optical modulation device, and the bias voltage conversion circuit is used to send the bias voltage to the phase optical modulation device according to the enable signal;

[0029] The dimming driving component is connected to the phase light modulation device; the dimming driving component is used to drive the micromirror of the phase light modulation device to move under the bias voltage according to the synchronization signal and the phase video signal.

[0030] In the embodiment of the present application, a bias voltage conversion circuit is provided in the dimming driving module to send a bias voltage to the phase light modulation device to drive the micromirror of the phase light modulation device to move under the bias voltage.

[0031] In some embodiments of the present application, the bias voltage conversion circuit includes: the control component, a digital-to-analog converter DAC and an amplifier;

[0032] The control component is connected to the display driving component and the DAC respectively, and the display driving component is specifically used to send the enable signal to the control component;

[0033] The control component is used to input a target voltage corresponding to the primary color light to the DAC according to the enable signal;

[0034] The DAC is used to convert the target voltage into a voltage analog signal;

[0035] The amplifier is connected to the DAC and the phase optical modulation device respectively, and the amplifier is used to send the bias voltage to the phase optical modulation device according to the voltage analog signal.

[0036] In this embodiment, in the embodiment of the present application, a bias voltage conversion circuit is provided to send a bias voltage to the phase light modulation device to drive the micromirror of the phase light modulation device to move under the bias voltage.

[0037] In some embodiments of the present application, the control component is further used to output a first voltage signal;

[0038] The amplifier is specifically used to adjust the bias voltage according to the first voltage signal to obtain a processed bias voltage, and send the processed bias voltage to the phase optical modulation device. The first voltage signal is used to control the bias voltage to change within a target voltage range.

[0039] In this embodiment, the speckle elimination signal is superimposed to reduce the speckle formed by the change in the position of the coherent speckle caused by the change in the height of the micromirror due to the influence of the small voltage change.

[0040] In some embodiments of the present application, the amplifier is connected to the control component;

[0041] The amplifier is further used to send the bias voltage to the control component, so that the control component corrects the target voltage corresponding to the subsequent primary color light according to the bias voltage;

[0042] In this embodiment, the voltage deviation between the voltage value output by the amplifier and the target voltage is used to determine the error introduced by the voltage value after DAC conversion and the amplifier amplification, so as to correct the bias voltage of the subsequent primary color light according to the error, so as to realize closed-loop control and improve the accuracy of the bias voltage input to the phase light modulation device.

[0043] In some embodiments of the present application, the control component is also used to:

[0044] Determine a first moment of a bias voltage corresponding to a current primary color light output by the amplifier;

[0045] Determine a second time when the display driving component outputs an enable signal corresponding to the current primary color light;

[0046] Determine a first duration according to the first moment and the second moment;

[0047] The output time of the subsequent enable signal corresponding to the primary color light is adjusted according to the first time length.

[0048] In this embodiment, the delay of the enable signal output by the display driving component is adjusted to achieve synchronization between the enable signal and the amplifier output bias voltage.

[0049] In some embodiments of the present application, the video processing component is specifically used to:

[0050] Acquire a plurality of sub-video signals, wherein the plurality of sub-video signals are obtained after decoding the video signal;

[0051] For any sub-video signal, determining a phase information signal corresponding to the sub-video signal;

[0052] The phase video signal is determined according to phase information signals corresponding to a plurality of sub-video signals.

[0053] In the embodiment of the present application, a phase video signal is generated by performing a phase recovery operation on multiple sub-video signals of a video signal for subsequent phase modulation.

[0054] In some embodiments of the present application, the video processing component is specifically used to:

[0055] Acquire a first resolution of the phase light modulation device;

[0056] According to the first resolution, pixel compression is performed on an image in the video signal having a resolution higher than the first resolution, so that the resolution of the pixel-compressed image matches the first resolution.

[0057] In the embodiment of the present application, resolution matching is performed to ensure that the number of pixels of the light modulation component and the phase light modulation device matches, and the time of the phase recovery operation can also be reduced.

[0058] In the embodiment of the present application, the states of multiple micromirrors of the light modulation component can be controlled to achieve image display.

[0059] In a second aspect, the present application provides a local backlight adjustment method for a laser TV, wherein the laser TV comprises: a main control chip, a display driving component, a light modulation component, a light source component, a laser driving component, a phase light modulation module and a video processing component, wherein the phase light modulation module comprises a control component;

[0060] The display driving component is connected to the light modulation component, the phase light modulation module and the laser driving component respectively; the laser driving component is connected to the light source component; the video processing component is connected to the main control chip and the phase light modulation module respectively;

[0061] The method comprises:

[0062] Acquire a video signal through the display driving component, and send a synchronization signal to the laser driving component and the phase light modulation module according to the video signal, and send a display driving signal to the light modulation component according to the video signal;

[0063] Determine a light source driving signal through the laser driving component, and drive the light source component to light up according to the light source driving signal to emit primary color light to the phase light modulation module;

[0064] Sending a phase video signal to the phase light modulation module according to the video signal through the video processing component;

[0065] Determining a bias voltage according to the synchronization signal through the phase light modulation module, and performing phase light modulation on the primary color light according to the phase video signal and the bias voltage, so as to emit modulated light to the light modulation component;

[0066] Displaying an image based on the modulated light by means of the light modulation component;

[0067] The bias voltage is obtained through a control component, and a voltage correction is performed on a target voltage corresponding to subsequent primary color lights according to the bias voltage. The corrected target voltage is used to determine a bias voltage corresponding to subsequent primary color lights.

[0068] In this embodiment, a video signal is obtained by a display driving component, and a synchronization signal is sent to a laser driving component and a phase light modulation module according to the video signal, and at the same time, a display driving signal is sent to the light modulation component according to the video signal. A light source driving signal is sent to the laser driving component according to the synchronization signal by the laser driving component to drive the light source component to light up and emit primary color light. A phase video signal is sent to the phase light modulation module according to the video signal by the video processing component. Phase light modulation is performed by the phase light modulation module according to the phase video signal and the synchronization signal to emit modulated light to the light modulation component, and an image is displayed based on the modulated light by the light modulation component, and a bias voltage is obtained by a control component, and a voltage correction is performed on a target voltage corresponding to subsequent primary color light according to the bias voltage, and the corrected target voltage is used to determine the bias voltage corresponding to subsequent primary color light to realize closed-loop control, thereby realizing a more accurate setting of the bias voltage, so that when realizing local backlight adjustment, the light energy is redistributed in space, the accuracy of increasing the peak brightness and reducing the dark field brightness is improved, and the light energy efficiency is improved.

[0069] In a third aspect, the present application provides a computer-readable storage medium having computer-executable instructions stored thereon. When the computer-executable instructions are executed by a processor, the method described in the second aspect is implemented.

[0070] The computer-readable storage medium provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar, which will not be repeated here.

[0071] In a fourth aspect, the present application provides a computer program product, including a computer program, which implements the method described in the second aspect when executed by a processor.

[0072] The computer program product provided in the embodiment of the present application can execute the technical solution in the above method embodiment, and its beneficial effects are similar and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the implementation methods in the embodiments of the present application or the related technologies, the following is a brief introduction to the drawings required for use in the embodiments or the related technology descriptions. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0074] Figure 1 A schematic diagram of a backlight local adjustment example of an embodiment of the present application;

[0075] Figure 2A schematic diagram of a phase light modulation device and a multi-chip light modulation component for realizing local backlight adjustment according to an embodiment of the present application;

[0076] Figure 3 A schematic diagram of another method of local backlight adjustment according to an embodiment of the present application;

[0077] Figure 4 A schematic diagram of a monolithic phase light modulation device and a monolithic light modulation component for realizing local backlight adjustment as exemplified in an embodiment of the present application;

[0078] Figure 5 A monolithic phase light modulation device exemplified in the embodiment of the present application is matched with a light modulation component to realize local backlight adjustment;

[0079] Figure 6 A schematic diagram of the structure of a laser TV provided in an embodiment of the present application;

[0080] Figure 7 A schematic diagram of the structure of a video processing component 106 provided in an embodiment of the present application;

[0081] Figure 8 A schematic diagram of the structure of another video processing component 106 provided in an embodiment of the present application;

[0082] Fig. 9 A schematic diagram of the structure of another laser TV provided for this application;

[0083] Fig.10 A schematic diagram of a light source, phase modulation and display synchronization according to an example of an embodiment of the present application;

[0084] Fig.11 A schematic diagram of the structure of a phase optical modulation module 107 provided in an embodiment of the present application;

[0085] Fig.12 A schematic diagram of the structure of a bias voltage conversion circuit 711 provided in an embodiment of the present application;

[0086] Fig.13 A schematic diagram of the structure of another bias voltage conversion circuit 711 provided in an embodiment of the present application;

[0087] Fig.14 A schematic diagram of a waveform diagram of an enable signal and a bias voltage according to an example of an embodiment of the present application;

[0088] Fig.15 A schematic diagram of adjusting the delay of an enable signal corresponding to subsequent primary color lights when there is a delay in an example of an embodiment of the present application;

[0089] Fig.16A schematic diagram of a bias voltage signal according to an embodiment of the present application without superimposing the first voltage signal and superimposing the first voltage signal;

[0090] Fig.17 A schematic diagram of a waveform diagram of an enable signal and a bias voltage signal superimposed with a first voltage signal according to an example of an embodiment of the present application;

[0091] Fig.18 A schematic diagram of a first brightness correction parameter and an image area exemplified in an embodiment of the present application;

[0092] Fig.19 A schematic diagram of a target matrix exemplified in an embodiment of the present application;

[0093] Fig. 20 A schematic flow chart of a method for adjusting the local backlight of a laser television provided in an embodiment of the present application. DETAILED DESCRIPTION

[0094] In order to make the purpose, implementation mode and advantages of the present application clearer, the exemplary implementation mode of the present application will be clearly and completely described below in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0095] It should be noted that the brief description of terms in this application is only for the convenience of understanding the embodiments described below, and is not intended to limit the embodiments of this application. Unless otherwise specified, these terms should be understood according to their ordinary and common meanings.

[0096] In addition, the terms "include" and "have" and any variations thereof are intended to cover but not exclude inclusion, for example, a product or device comprising a list of components is not necessarily limited to those components expressly listed but may include other components not expressly listed or inherent to such products or devices.

[0097] When laser TV is projecting, it is limited by the form of light source and cannot adjust the brightness of the lamp beads by area like LCD TV backlight to achieve local adjustment of backlight and high dynamic range (HDR) display. In order to achieve local adjustment of backlight, laser TV can be achieved through the following two methods:

[0098] Method 1

[0099] Add an additional light modulation component so that the light source output is first modulated by the first light modulation component and then irradiated to the second light modulation component for modulation display. This solution has poor practicality, cannot improve the peak brightness, and has low light efficiency. After being modulated by the first light modulation component, the dark field part of the light is discarded, and only the bright field part of the light is reflected to the second light modulation component for display. Figure 1 As shown, by significantly reducing the dark field brightness, local adjustment of the backlight is achieved, thereby achieving a high dynamic range display effect.

[0100] Method 2

[0101] For the three-chip three-color laser light modulation component display technology, by adding a phase light modulation device, each primary color light to the light modulation component is modulated, such as Figure 2 As shown, the phase modulation of the phase light modulation device is as follows Figure 3 As shown in the figure, the advantage of phase light modulation is that it can reduce the brightness of the dark field and increase the peak brightness, thereby achieving local adjustment of the backlight in a larger range, and has high light efficiency and extremely high technical advantages. In this solution, since the three primary colors will be combined in space through optical devices for the final display, the display timing and phase light modulation timing only need to meet the frame synchronization of the video image, and there is no need to consider additional signal synchronization requirements.

[0102] However, if Figure 4 As shown, since the lighting timing of the primary color lights displayed by the monolithic light modulation component is time-division multiplexed, this method cannot be used for the monolithic light modulation component display technology for home display.

[0103] Therefore, the present application provides a laser TV, which uses a phase light modulation device to phase modulate the light source output, realizes the spatial distribution adjustment of light energy, and combines the primary color display timing of the monolithic light modulation component to realize the timing synchronization of local adjustment and display of each primary color backlight, realizes the increase of peak brightness and the reduction of dark field brightness, improves the light energy efficiency, and thus realizes HDR display.

[0104] The following is an introduction to the basic principles of phase light modulation devices to achieve local backlight adjustment:

[0105] The phase light modulator is a device that contains multiple dimming micromirrors with a size of micrometers. The reflective surface of each micromirror is flat and can move up and down in a direction perpendicular to the reflective surface. The phase relationship between the light incident on each micromirror is changed by the up and down displacement of the micromirror, such as Figure 3 As shown, since laser is coherent light, when the phase changes, diffraction will be formed, thereby adjusting the light intensity distribution of the picture. In actual display effects, it is possible to "move" the light in the dark area of ​​the picture to the bright area, making the bright area brighter and the dark area changed, thereby achieving local adjustment of the backlight with a high dynamic range.

[0106] The monolithic phase light modulator is used with the light modulator to achieve local backlight adjustment, such as Figure 5 As shown, the light source of the three-color laser is lit up in a time-sequential order. When the monochromatic laser is irradiated onto the phase light modulator, the device can perform phase modulation on the light according to the displayed image content. The phase is changed by the up and down displacement of the pixel point (i.e., the micromirror). The modulated light is input to the surface of the light modulation component. The diffracted light is strong in the bright area corresponding to the image, and weak in the dark area corresponding to the image, thereby realizing local adjustment of the backlight. The diffracted light is further modulated by pulse width modulation (PWM) through the light modulation component and then imaged on the screen through the lens, thereby realizing HDR display.

[0107] That is to say, the light intensities of at least two light beams in the illumination light beam after dimming by the phase light modulator are different, which can expand the brightness difference between at least two image partitions in the projected image, thereby improving the dynamic contrast of the projected image without changing the brightness of the light source and without processing the projected image, thereby improving the display effect of the image subsequently projected through the lens.

[0108] Specifically, controlling the phase light modulator requires phase information in the spatial light field. Since the phase information cannot be measured, a phase recovery algorithm is required to obtain it. Using the light field amplitude (intensity) information of the known input surface (image plane) and the output surface (far-field diffraction plane, i.e., the light modulation component), the transformation relationship between the two light fields is known, and the light field phase information can be iteratively solved by diffraction calculation (i.e., multiple constraint replacements and transformations in both the spatial and spectral domains). Here, the Gerchberg-Saxtong (hereinafter referred to as GS) algorithm is taken as an example. The input surface light wave function f(x, y) of the illumination beam output by the light source at the phase light modulator can be expressed as:

[0109] f(x,y)=A(x,y)exp(iΦ(x,y))(1)

[0110] Among them, A(x,y) and Φ(x,y) represent the amplitude distribution and phase distribution of the light field at the phase light modulator, where A(x,y) is a known quantity, Φ(x,y) can be estimated during the initial calculation, and (x,y) represents the coordinates of the input surface (image plane) point.

[0111] After phase modulation, the amplitude distribution and phase distribution at the output surface can be expressed by the optical wave function g(u,v):

[0112] g(u,v)=B(u,v)exp(iθ(u,v))(2)

[0113] Among them, B(u,v), θ(u,v) and (u,v) represent the amplitude distribution, phase distribution and point coordinates of the illumination beam after phase modulation on the output surface respectively. Among them, since the light intensity information after modulation depends on the video signal, the amplitude distribution is known.

[0114] Based on the light wave functions f and g, the following transformation conditions are met:

[0115] g=F(f), f=F-1(g)(3)

[0116] Where F represents Fourier transform, and F-1 represents inverse Fourier transform. Therefore, the input light wave function can be transformed into the output light wave function through Fourier transform, and the output light wave function can be transformed into the input light wave function through inverse Fourier transform.

[0117] In summary, the GS algorithm process is as follows:

[0118] Step 1: Estimate the initial input phase information Φ0(x,y), where n is the number of cycles.

[0119] Step 2: Perform Fourier transform on the input function f(x,y)=A(x,y)exp(iΦ0(x,y)) to obtain the light wave function g'(u,v), where g'(u,v)=B'(u,v)exp(iθn(u,v)), and obtain the phase relationship θn(u,v).

[0120] Step 3: Replace the phase information in the output function with θn(u,v) to obtain g(u,v)=B(u,v)exp(iθn(u,v)).

[0121] Step 4: Perform inverse Fourier transform on g(u,v)=B(u,v)exp(iθn(u,v)) to obtain f'(x,y)=A'(x,y)exp(iΦn(x,y)).

[0122] Step 5: Determine whether the mean square error of the output amplitudes B'(u,v) and B(u,v) is less than the specified index ε or reaches a certain number of iterative loop operations K. If not, execute step 6; if yes, execute step 7.

[0123] Step 6: Replace the phase information in the input function with Φn(x,y) and repeat step 2.

[0124] Step 7: Complete the phase recovery operation. Φk(x, y) is the phase distribution function required by the phase light modulation device to represent the phase information.

[0125] The technical solution of the present application is described in detail below in conjunction with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0126] Figure 6 A schematic diagram of the structure of a laser TV provided in an embodiment of the present application is shown in FIG. Figure 6 As shown, the laser TV 10 includes: a main control chip 101, a display driving component 102, a light modulation component 103, a light source component 104 and a laser driving component 105.

[0127] Among them, the main control chip 101 is used to generate a video signal according to an external video source. Exemplarily, the external video source can be a network video source, or a high-definition multimedia interface (HDMI) video signal or a video source in a storage medium such as a USB flash drive. The decoded video signal can be a digital interface standard (V-By-One) signal developed for image transmission, or a low voltage differential signaling technology interface (Low Voltage Differential Signaling, LVDS), etc.

[0128] The display driving component 102 is connected to the laser driving component 105 and the light modulation component 103 respectively. The display driving component 102 is used to obtain the video signal, and send a synchronization signal to the laser driving component 105 according to the video signal, and send a display driving signal to the light modulation component 103 according to the video signal. It can be understood that the display driving signal is transmitted according to a first timing sequence. For example, if the first timing sequence is an RGB cycle (i.e., a red light-green light-blue light cycle, hereinafter R is used to represent red light, G is used to represent green light, and B is used to represent blue light), the light modulation component 103 displays images in the order of red light-green light-blue light.

[0129] In one possible implementation, the synchronization signal includes an enable signal and a PWM signal, wherein the enable signal may be a timing control signal, which may generally be expressed as X_EN, wherein X represents the abbreviation of different primary color lights, and the enable signal is used to coordinate the timing of output of different color lights, and the PWM signal is a square wave signal, which is used to provide a current signal for laser lighting.

[0130] Specifically, the display driving component 102 may determine the enable signal and the PWM signal according to the video signal.

[0131] In one possible implementation, after receiving the video signal, the display driver component 102 determines the display quality requirement based on the video signal, and then determines the first timing based on the display quality requirement, and generates a display driver signal based on the specific partitioning of the light modulation component 103 and the bit range of each primary color pixel.

[0132] The laser driving component 105 is connected to the light source component 104. The laser driving component 105 is used to send a light source driving signal to the light source component 104 according to the synchronization signal to drive the light source component 104 to light up and emit primary color light. The light source driving signal is transmitted according to the second timing.

[0133] Exemplarily, the light source assembly 104 includes three-color lasers, namely red, green and blue lasers. If the second timing sequence is an RGB cycle, the light source assembly 104 uses the three-color laser to emit three-color laser illumination beams in the order of red light-green light-blue light.

[0134] In a possible implementation, the laser TV 10 further includes: a video processing component 106 and a phase light modulation module 107 .

[0135] The video processing component 106 is respectively connected to the main control chip 103, the display driving component 102, and the phase light modulation module 107, wherein the video processing component 106 is used to receive the video signal sent by the main control chip 103, and send a phase video signal to the phase light modulation module 107 according to the video signal.

[0136] Specifically, the video processing component 106 may perform a phase recovery operation on the video signal to generate a phase video signal, so that the phase light modulation module 107 may perform phase modulation based on the phase video signal.

[0137] The display driving component 102 is connected to the phase light modulation module 107 . The display driving component 102 is also used to send a synchronization signal to the phase light modulation module 107 .

[0138] The phase light modulation module 107 is used to perform phase light modulation according to the phase video signal and the synchronization signal to emit modulated light to the light modulation component 103. Specifically, the phase video signal and the synchronization signal can be transmitted according to the third timing sequence. For example, if the third timing sequence is an RGB cycle, the phase light modulation module 107 performs phase light modulation in the order of red light-green light-blue light.

[0139] The light modulation component 103 is used to display images based on modulated light to achieve local backlight adjustment.

[0140] In a possible implementation, the light modulation component 103 is specifically used to refresh the state of the micromirror on the light modulation component 103 according to the first timing sequence, and the state is on or off. The micromirror of the light modulation component after the state is refreshed realizes image display according to the modulated light received.

[0141] The first timing, the second timing and the third timing are synchronized, and the duration of each primary color is equal, so that the light source component 104 lights up, the light modulation component 103 displays an image, and the phase light modulation module 107 performs phase light modulation to achieve synchronization.

[0142] In order to achieve synchronization between the first timing and the third timing, since there is a certain hysteresis in the on and off of the laser, the display driving component 102 can fine-tune the delay of the first timing so that the first timing and the third timing are synchronized.

[0143] In a possible implementation, the main control chip 101 may be a system on chip (SOC).

[0144] In a possible implementation, the display driving component 102 may be a digital light processing chip (Digital Light Processing, DLP).

[0145] In a possible implementation, the light modulation component 103 may be a digital micromirror device (DMD).

[0146] In one possible implementation, the video processing component 106 may include a Field Programmable Gate Array (FPGA) chip, or the video processing component 106 may also be a graphics processing unit (GPU), which may be configured with a memory, such as a Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM), to cooperate with the FPGA chip or GPU to implement large-scale image processing operations.

[0147] In this embodiment, the display driving component 102 is used to obtain a video signal, and send a synchronization signal to the laser driving component 105 according to the video signal, and send a display driving signal to the light modulation component 103 according to the video signal. The laser driving component 105 is used to send a light source driving signal to the light source component according to the synchronization signal to drive the light source component 104 to light up and emit primary color light. The video processing component 106 is used to send a phase video signal to the phase light modulation module 107 according to the video signal. The display driving component 102 is also used to send a synchronization signal to the phase light modulation module 107. The phase light modulation module 107 is used to perform phase light modulation according to the phase video signal and the synchronization signal to emit modulated light to the light modulation component 103. The light modulation component 103 is used to display an image based on the modulated light, so that when implementing local backlight adjustment, the light energy is redistributed in space, the peak brightness is increased and the dark field brightness is reduced, and the light energy efficiency is improved.

[0148] In the embodiment of the present application, the display driver component 102 may obtain the video signal in the following two ways:

[0149] Method 1

[0150] The video processing component 106 is connected to the display driving component 102, and the display driving component 102 is specifically used for:

[0151] Receive the video signal sent by the video processing component.

[0152] Method 2

[0153] The main control chip 101 is connected to the display driver component 102, and the display driver component 102 has the function of:

[0154] Receive the video signal sent by the main control chip 101.

[0155] Next, the video processing component 106 generates a phase video signal according to the video signal in detail:

[0156] The video signal is usually a multi-channel serial signal, which needs to be decoded first to generate multiple sub-video signals. For example, the multiple sub-video signals may include: an R sub-video signal, a G sub-video signal, and a B sub-video signal.

[0157] In the embodiment of the present application, multiple sub-video signals may be generated in the following two ways:

[0158] Decoding method 1

[0159] The video processing component 106 can generate multiple sub-video signals according to the video signal, which makes the interface link simpler but increases the computing power of the video processing component 106. The video signal is output from the video interface in the main control chip 101, and after being input to the video processing component 106, the video processing component 106 decodes it to obtain the R sub-video signal, the G sub-video signal and the B sub-video signal, and the sub-video signal can be stored in the memory.

[0160] Decoding method 2

[0161] The main control chip 101 can generate multiple sub-video signals according to the video signal, and then input the multiple sub-video signals to the video processing component 106. This method can reduce the computing power requirement of the video processing component 106 and transfer this part of the processing process to the main control chip 101 for completion.

[0162] The video processing component 106 is specifically used to: obtain multiple sub-video signals, which are obtained after decoding the video signal. For any sub-video signal, determine the phase information signal corresponding to the sub-video signal. According to the phase information signals of the multiple sub-video signals, determine the phase video signal. It can be understood that the phase information signal includes multiple phase diagram information.

[0163] For the above-mentioned decoding method 1 for generating multiple sub-video signals, the video processing component 106 may include a bypass video signal output module 1061 , a sub-frame decoding module 1062 , a phase recovery operation module 1063 and a phase video signal output module 1064 .

[0164] like Figure 7 As shown, the bypass video signal output module 1061 is used to divide the video signal into two paths inside the video processing component 106, one path is used to decode the sub-video signal, and the other path does not require image processing and directly outputs the video signal to the display driving component 102 for image display by the light modulation component 103.

[0165] The sub-frame decoding module 1062 is used to receive the video signal sent from the main control chip 101, obtain the line synchronization signal, field synchronization signal, enable synchronization signal and the R gray value information, G gray value information, and B gray value information of all pixels according to the video signal, form the R sub-video signal according to the R gray value information, form the G sub-video signal according to the G gray value information, and generate the B sub-video signal according to the B gray value information. The R sub-video signal, the G sub-video signal, and the B sub-video signal can be stored in the memory for subsequent phase recovery operations.

[0166] Specifically, the relationship between the video signal, sub-video signal and image is as follows: the video signal includes multiple images. For any image in the video signal, the image includes an R sub-image, a G sub-image and a B sub-image. Multiple R sub-images can form an R sub-video signal, multiple G sub-images can generate a G sub-video signal, and multiple B sub-images can generate a B sub-video signal.

[0167] In one possible implementation, the subframe decoding module 1062 can determine whether it is necessary to compress the resolution of the image based on the resolution of the phase light modulation device in the phase light modulation module. Specifically, the first resolution of the phase light modulation device is obtained, and based on the first resolution, pixel compression is performed on an image in the video signal whose resolution is higher than the first resolution, so that the resolution of the pixel compressed image matches the first resolution.

[0168] Specifically, for an image in the video signal having a resolution higher than the first resolution, the subframe decoding module 1062 may perform pixel compression on the image according to the first resolution so that the resolution of the pixel-compressed image matches the first resolution.

[0169] That is to say, when the number of pixels of the phase light modulator is smaller than the number of pixels of the light modulator component 103, it is necessary to compress the high-resolution image in the video signal to obtain a low-resolution image to match the pixel number requirement of the phase light modulator. Then, a subsequent phase recovery operation is performed based on the resolution-adjusted image to obtain the phase video information, which can also reduce the time of the subsequent phase recovery operation.

[0170] The phase recovery operation module 1063 is used to read the R sub-video signal, the G sub-video signal, and the B sub-video signal from the memory, and take the R sub-video signal as an example, perform multiple iterative operations according to the phase recovery algorithm, obtain the phase information of each pixel in the R sub-video signal, generate R phase map information, and cache the generated phase map information to the memory for subsequent output. The operation time of performing the phase recovery operation on the R sub-video signal, the G sub-video signal, and the B sub-video signal can be less than the display duration of each frame.

[0171] The phase video signal output module 1064 is used to generate a phase video signal according to the decoded horizontal synchronization signal, field synchronization signal, enable synchronization signal, combined with the R phase map information, the G phase map information and the B phase map information.

[0172] It should be noted that in order to ensure that the video signal and the phase video signal output by the video processing component 106 are synchronized, the bypass video signal output module 1061 can adjust the delay of the output video signal so that the video signal and the phase video signal are output synchronously.

[0173] For the above decoding method 2 for generating multiple sub-video signals, the main control chip 101 may include a sub-frame decoding module, that is, the main control chip 101 needs to add a sub-video signal decoding function based on normal video signal decoding, and add an additional video signal output port for outputting the sub-video signal. The output of the video signal needs to adjust the delay to meet the demand of the operation time, and the sub-video signal needs to maintain a stable phase difference and frame synchronization with the video signal, that is, the video signal and the phase video signal are output synchronously.

[0174] Specifically, the main control chip 101 can obtain a sub-video signal while decoding the external video source to obtain a video signal. It can also compress the image in the video signal according to the resolution of the back-end phase light modulation device to generate a sub-video signal. When outputting the sub-video signal, it can be output through a transistor-transistor logic (Transistor Transistor Logic, TTL) interface to simplify the decoding requirements of the video processing component 106.

[0175] Correspondingly, such as Figure 8 As shown, the video processing component 106 may include: a phase recovery operation module 1065 and a phase video signal synchronization output module 1066. Since the video signal does not need to be decoded by the video processing component 106 as a sub-video signal, the video processing component 106 only needs to receive the sub-video signal.

[0176] The phase recovery operation module 1065 is used to receive the R sub-video signal, the G sub-video signal and the B sub-video signal, take the R sub-video signal as an example, perform multiple iterative operations according to the phase recovery algorithm, obtain the phase information of each pixel in the R sub-video signal, generate R phase map information, and cache the generated phase map information to the memory for subsequent output. The operation time of performing the phase recovery operation on the R sub-video signal, the G sub-video signal and the B sub-video signal can be less than the display time of each frame.

[0177] The phase video signal synchronization output module 1066 is used to generate a phase video signal according to the horizontal synchronization signal, field synchronization signal, enable synchronization signal obtained by decoding the main control chip 101, combined with the R phase diagram information, G phase diagram information and B phase diagram information.

[0178] In a possible implementation, in decoding mode 2, the video processing component 106 may receive the video signal and the sub-video signal respectively, and the video processing component 106 may perform delay adjustment and output of the video signal. The advantage of this mode is that the timing is adjusted by a unified chip (the chip in the video processing component 106).

[0179] Next, the phase light modulation module 107 implementing the phase light modulation will be described in detail.

[0180] like Fig. 9 As shown, Fig. 9 A structural schematic diagram of another laser TV provided in the present application, the laser TV 10 includes: a main control chip 101, a display driver component 102, a light modulation component 103, a light source component 104, a laser driver component 105, and a video processing component 106.

[0181] The connection relationship among the main control chip 101, the display driving component 102, the light modulation component 103, the light source component 104, the laser driving component 105, and the video processing component 106, as well as the specific implementation are referred to the above embodiments and will not be described again here.

[0182] The phase light modulation module 107 includes a dimming driving module 1071 and a phase light modulation device 1072 .

[0183] The dimming driving module 1071 is connected to the video processing component 106 and the phase light modulator 1072 respectively. The dimming driving module 1071 is used to send a dimming driving signal to the phase light modulator 1072 according to the phase video signal and the synchronization signal.

[0184] The phase light modulation device 1072 is used to perform phase light modulation according to the dimming driving signal to emit modulated light to the light modulation component 103, so that the light modulation component 103 displays an image based on the modulated light.

[0185] In a possible implementation, the phase light modulation device 1072 may be a phase modulator (Light Phase Modulator, PLM).

[0186] It is known that when the geometric distance of light waves propagating in a medium is consistent, the phase change is related to the wavelength of the light waves. For the dimming drive module 1071, its input is a phase video signal, that is, multiple phase diagram information (images after Fourier transformation). Therefore, the maximum displacement that the lens can adjust is particularly important. The role of the bias voltage is to determine the maximum displacement of the micromirror of the PLM chip. Then, different bias voltages correspond to three light waves of different wavelengths. In other words, it is the wavelength of light that affects phase modulation. For light waves of different wavelengths, different bias voltages can be used to displace the lens to achieve phase modulation of the light wave.

[0187] In a possible implementation, the synchronization signal includes an enable signal and a PWM signal, and the dimming driving module 1071 is specifically used for:

[0188] The bias voltage of the phase optical modulation device 1072 is determined according to the enable signal.

[0189] According to the enable signal, the PWM signal and the phase video signal, a dimming driving signal is sent to the phase light modulation device 1072 , where the dimming driving signal includes a bias voltage.

[0190] In a possible implementation, the phase optical modulation device 1072 is specifically used for:

[0191] According to the bias voltage, the displacement of the micromirror on the phase light modulation device 1072 is controlled to phase-modulate the primary light through the displaced micromirror, so as to achieve precise phase adjustment of light of different wavelengths, wherein the bias voltage includes sub-bias voltages corresponding to primary light of different wavelengths. Exemplarily, the bias voltage may include a sub-bias voltage corresponding to the red primary light, a sub-bias voltage corresponding to the green primary light, and a sub-bias voltage corresponding to the blue primary light.

[0192] It can be understood that since the second timing and the third timing are synchronized, for example, taking the red primary light as an example, when the light source assembly 104 emits the red primary light, the phase light modulation device 1072 controls the up and down displacement of the micromirror according to the sub-bias voltage corresponding to the red light, so that the displaced micromirror can phase modulate the red primary light emitted by the light source assembly 104.

[0193] In one possible implementation, the moment when the phase light modulator 1072 receives the dimming drive signal is consistent with the moment when the light modulation component 103 receives the display drive signal. The "consistent" here means that the phase light modulator 1072 receives the dimming indication and the light modulation component 103 receives the display indication synchronously. Specifically, for example, the delay of the drive component with a faster transmission speed can be adjusted to meet the transmission time requirement of another drive component with a slower transmission speed, so that the phase light modulator 1072 and the light modulation component 103 receive the drive signal at the same time.

[0194] In a possible implementation, since the display driver component 102 may add image correction functions such as projection trapezoidal correction, screen entry correction or obstacle avoidance, it is necessary to add additional image correction processing operations. For example, after caching one frame of image information, it is necessary to move the corresponding pixel points through the image correction algorithm and recalculate its grayscale information to achieve the image correction function. Therefore, it is necessary to increase the delay of the dimming driver component 1071 sending the dimming drive signal to the phase light modulation device 1072 to synchronize the display driver component 102 to output the display drive signal.

[0195] In one possible implementation, the light modulation component 103 is specifically used to: refresh the states of multiple micromirrors on the light modulation component 103 according to a first timing sequence, the states being on or off, and receive modulated light through the multiple micromirrors of the refreshed light modulation component to display an image.

[0196] Exemplarily, taking the red primary light as an example, when the light source component 104 emits the red primary light, the phase light modulator 1072 controls the up and down displacement of the micromirror according to the bias voltage corresponding to the red light, so that the displaced micromirror can phase modulate the red primary light emitted by the light source component 104, and the light modulation component determines to refresh the micromirror corresponding to the red primary light on the light modulation component 103, so that the phase light modulator 1072 sends modulated light to the light modulation component 103, and the light modulation component 103 receives the modulated light corresponding to the red primary light through the micromirror after the state is refreshed, so as to display an image.

[0197] Specifically, Fig.10 As shown, Fig.10 1 is a schematic diagram of light source, phase modulation and display synchronization, that is, the light source component 104 emits red primary light, the phase light modulator 1072 performs phase modulation on the red primary light, and the light modulation component 103 performs image display on the modulated light corresponding to the red primary light. The following takes the red primary light as an example for explanation:

[0198] Before the laser driving component 105 and the dimming driving module 1071 receive the synchronization signal, the light modulation component 103 and the phase light modulation device 1072 will first complete the reception of the red image data.

[0199] When the laser driving component 105 and the dimming driving module 1071 receive the synchronization signal, they will synchronously perform the following operations:

[0200] (1) The laser driving component 105 drives the red laser in the light source component 104 to light up, so as to emit red primary color light to the phase light modulation device 1072, and the lasers of other colors are turned off.

[0201] (2) The phase light modulator 1072 receives the dimming drive signal sent by the dimming drive module 1071, so as to send a sub-bias voltage corresponding to the red primary color light to the phase light modulator 1072 (wherein the minimum unit of the micromirror displacement of the phase light modulator 1072 meets the red laser wavelength requirement). After receiving the dimming drive signal, the phase light modulator 1072 moves the micromirror up and down according to the sub-bias voltage to achieve phase modulation of the red primary color light, that is, to achieve low-resolution backlight adjustment.

[0202] (3) The light modulation component 103 receives the display driving signal sent by the display driving component 102. After receiving the display driving signal, the light modulation component 103 refreshes the state of the micromirrors on the light modulation component 103, and flips a plurality of micromirrors simultaneously according to the determined state by adjusting the flipping time of the micromirrors, so as to realize PWM modulation of the modulated light emitted by the phase light modulation device 1072, that is, to realize high-resolution display, thereby realizing image display.

[0203] The synchronization corresponding to other primary color lights, such as the red primary color light, is consistent. For the green primary color light and the blue primary color light, the above-mentioned red primary color light can be referred to, and no further details are given here.

[0204] In this embodiment, the display driving component 102 is used to obtain a video signal, and send a synchronization signal to the laser driving component 105 and the dimming driving module 1071 according to the video signal, and send a display driving signal to the light modulation component 103 according to the video signal. The laser driving component 105 is used to send a light source driving signal to the light source component according to the synchronization signal to drive the light source component 104 to light up and emit primary color light. The video processing component 106 is used to send a phase video signal to the dimming driving module 1071 according to the video signal. The dimming driving module 1071 is used to send a dimming driving signal to the phase light modulator 1072 according to the phase video signal and the synchronization signal, so that the phase light modulator 1072 performs phase light modulation according to the dimming driving signal to emit modulated light to the light modulation component 103. The light modulation component 103 is used to display an image based on the modulated light, so that when implementing local backlight adjustment, the light energy is redistributed in space, the peak brightness is increased and the dark field brightness is reduced, and the light energy efficiency is improved.

[0205] Next, the phase modulation of each primary color light by the phase light modulation module 107 is described in detail:

[0206] Fig.11 A schematic diagram of the structure of a phase optical modulation module 107 provided in an embodiment of the present application is shown in FIG. Fig.11 As shown, the phase light modulation module 107 includes: a dimming driving module 1071 and a phase light modulation device 1072 , wherein the dimming driving module 1071 includes a dimming driving component 710 and a bias voltage conversion circuit 711 .

[0207] The video processing component 106 is connected to the dimming driving component 710 . The video processing component 106 is specifically used to send a phase video signal to the dimming driving component 710 according to the video signal.

[0208] The display driving component 102 is respectively connected to the dimming driving component 710, the bias voltage conversion circuit 711, and the laser driving component 105. The display driving component 102 is specifically used for:

[0209] A synchronization signal is sent to the dimming driving component 710 .

[0210] An enable signal is sent to the bias voltage conversion circuit 711 .

[0211] In one possible implementation, the display driver component 102 may include a digital-to-analog converter (DAC), and the display driver component 102 is specifically used to: determine the PWM signal according to the video signal, and perform digital-to-analog conversion on the PWM signal through the DAC to obtain a converted PWM signal, and then send the converted PWM signal and an enable signal to the laser driver component 105.

[0212] Correspondingly, the laser driving component 105 can generate a light source driving signal according to the converted PWM signal and the enable signal.

[0213] The bias voltage conversion circuit 711 is connected to the phase optical modulation device 1072 . The bias voltage conversion circuit 711 is used to send a bias voltage to the phase optical modulation device 1072 according to an enable signal.

[0214] The dimming driving component 710 is connected to the phase light modulator 711. The dimming driving component 710 is used to send the phase diagram information in the phase video signal to the phase light modulator 711 according to the synchronization signal, drive the micromirror of the phase light modulator 1072 to move under the bias voltage, and realize phase modulation in combination with the phase video signal.

[0215] It can be understood that the phase video signal is composed of continuous phase diagram information (which can also be called a hologram). Then, the dimming drive component 710 can realize phase modulation based on the corresponding phase diagram information and the bias voltage according to the cycle order of the primary color light of the third timing sequence.

[0216] In one possible implementation, Fig.12 A schematic diagram of the structure of a bias voltage conversion circuit 711 provided in an embodiment of the present application is shown in FIG. Fig.12 As shown, the bias voltage conversion circuit 711 includes: a plurality of voltage regulators and an analog selection switch, wherein the analog selection switch is connected to the plurality of voltage regulators, the display driving component 102 and the phase light modulation device 1072 respectively.

[0217] Multiple voltage regulators are used to send target voltages corresponding to multiple primary color lights to the analog selection switch. Exemplarily, three voltage regulators are taken as an example in the figure, and target voltages corresponding to red primary color light, green primary color light, and blue primary color light are respectively sent to the analog selection switch through the three voltage regulators.

[0218] The display driving component 102 is specifically configured to send an enable signal to the analog selection switch.

[0219] The analog selection switch is used to determine the bias voltage from the target voltages corresponding to the multiple primary color lights according to the enable signal, and send the bias voltage to the phase light modulation device 1072.

[0220] Exemplarily, the third timing sequence determined by the enable signal is an RGB cycle, for example, when it cycles to R, the analog selection switch can determine the target voltage corresponding to the red primary light from the target voltages corresponding to the red primary light, the green primary light, and the blue primary light as the bias voltage. The target voltages corresponding to the three primary light colors are respectively input to the analog selection switch through three regulators, so that the analog selection switch can output different bias voltages based on the third timing sequence to achieve the purpose of voltage switching, that is, when light of a specific color is projected onto the phase light modulator 1072, the bias voltage will also be switched to a corresponding voltage value to determine the movement of the micromirror of the phase light modulator 1072 to achieve phase modulation.

[0221] In a possible implementation, the laser TV 10 further includes a power supply 108;

[0222] The bias voltage conversion circuit 711 further includes a direct current (DC / DC) converter.

[0223] The DC converter is connected to the power supply 108 and the plurality of voltage regulators respectively. The DC converter is used to input a first voltage to the plurality of voltage regulators respectively according to a driving voltage input by the power supply.

[0224] For any voltage regulator, it is specifically used to input a target voltage corresponding to the voltage regulator to the analog selection switch according to the first voltage.

[0225] Among them, each voltage regulator corresponds to a different target voltage.

[0226] Exemplarily, the power supply 108 can generate a 12V (volt) supply voltage to drive the bias voltage conversion circuit 711 to work. After the 12V voltage signal passes through the DC / DC, a 5V voltage signal is generated and input into the three voltage regulators respectively. Different target signals can be generated by changing the resistance values ​​of the voltage divider resistors in the three voltage regulators, so that the analog selection switch can perform voltage switching to output the corresponding bias voltage.

[0227] In this embodiment, the phase light modulation module 107 includes: a dimming drive module 1071 and a phase light modulation device 1072, wherein the dimming drive module 1071 includes a dimming drive component 710 and a bias voltage conversion circuit 711, the bias voltage conversion circuit 711 is used to send a bias voltage to the phase light modulation device 1072 according to an enable signal, and the dimming drive component 710 is used to drive the micromirror of the phase light modulation device 1072 to move under the bias voltage according to a synchronization signal and a phase video signal to achieve phase modulation, so that when local backlight adjustment is achieved, the light energy is redistributed in space, and the peak brightness is increased and the dark field brightness is reduced.

[0228] Fig.13 A schematic diagram of the structure of another bias voltage conversion circuit 711 provided in an embodiment of the present application is shown in FIG. Fig.13 As shown, the bias voltage conversion circuit 711 includes: a control component, a DAC and an amplifier.

[0229] The control component is connected to the display driver component 102 and the DAC respectively, and the display driver component 102 is specifically used to send an enable signal to the control component. Exemplarily, the control component and the DAC can be connected through an integrated circuit (Inter-Integrated Circuit, I2C) bus, or through a serial peripheral interface (Serial Perripheral Interface, SPI) bus, etc. The SPI bus connection can improve the communication efficiency, and the present application does not limit the connection method between the control component and the DAC.

[0230] The control component is used to input the target voltage corresponding to the primary color light to the DAC according to the enable signal.

[0231] DAC, used to convert the target voltage into a voltage analog signal;

[0232] The amplifier is connected to the DAC and the phase optical modulator 1072 respectively, and the amplifier is used to send a bias voltage to the phase optical modulator 1072 according to the voltage analog signal.

[0233] Specifically, the bias voltage conversion circuit 711 also includes four resistors and one capacitor, which is a structure required by the circuit. The specific connection between the amplifier and the four resistors and one capacitor can refer to Fig.13 .

[0234] In one possible implementation, if a digital-to-analog conversion function is integrated in the control component, the control component is also used to perform digital-to-analog conversion on the target voltage to obtain a voltage analog signal, and the DA interface sends the voltage analog signal to the amplifier, so that the amplifier is used to send a bias voltage to the phase optical modulator 1072 according to the voltage analog signal.

[0235] In a possible implementation, the control component may be a microcontroller unit (MCU).

[0236] Exemplarily, the control component can receive the enable signal corresponding to the red primary color light, the enable signal corresponding to the green primary color light, and the enable signal corresponding to the blue primary color light (i.e., R_EN, G_EN, B_EN) through the interrupt ports IN1, IN2, and IN3, respectively, so that the control component outputs three different target voltages to input the voltage analog signal to the amplifier. The amplifier can adjust the voltage range. For example, when the target voltage is low, the amplification factor of the amplifier is less than 1 to improve the control accuracy so as to input the bias voltage to the phase optical modulator 1072.

[0237] Since the target voltage is easily introduced into the voltage value after DAC conversion and amplifier amplification, the following voltage correction can be performed:

[0238] In a possible implementation, the amplifier is connected to the control component, the amplifier is further used to send a bias voltage to the control component, and the control component is further used to perform voltage correction on a target voltage corresponding to subsequent primary color lights according to the bias voltage.

[0239] Specifically, the amplifier can be connected to the AD interface of the control component to input a bias voltage to the AD interface. The control component can calculate a voltage deviation based on the voltage value received by the AD interface and the voltage value of the bias voltage required for the current primary color light, and then perform voltage correction on the target voltage corresponding to the subsequent primary color light based on the voltage deviation.

[0240] For example, the voltage value of the bias voltage required for the current primary color light is 1.15V, and the control component can receive a voltage value of 1.14V according to the AD interface, so there is a voltage deviation of 0.01V. The control component can increase the voltage value of the target voltage corresponding to the subsequent primary color light by 0.01V. For example, the voltage value of the bias voltage required for the subsequent primary color light is 1.18V (the target voltage of the primary color light is 1.18V), and the target voltage corresponding to the primary color light can be increased by 0.01V (i.e., 1.19V) to compensate for the 0.01V loss after DAC conversion and amplifier amplification, so that the bias voltage input to the phase light modulator 1072 is the required 1.18V.

[0241] The error introduced by the voltage value converted by the DAC and the amplification of the amplifier is determined by the voltage deviation between the voltage value output by the amplifier and the target voltage, so as to correct the bias voltage of the subsequent primary color light according to the error, so as to realize closed-loop control and improve the accuracy of the bias voltage input to the phase light modulator 1072.

[0242] For example, Fig.14 Schematic diagram of the waveform of the enable signal and the bias voltage. Fig.14: is a waveform diagram without delay, where VBIAS represents bias voltage, RED_EN represents enable signal corresponding to red primary color light, GREEN_EN represents enable signal corresponding to green primary color light, and BLUE_EN represents enable signal corresponding to blue primary color light. After the control unit receives the enable signal, it takes a certain amount of time for the voltage value to undergo DA conversion and amplifier amplification. In order to synchronize the output of the enable signal by the display driver component 102 and the output bias voltage of the amplifier, the delay of the subsequent output of the enable signal corresponding to the primary color light can be adjusted in the following manner:

[0243] In one possible implementation, a first moment when the bias voltage corresponding to the current primary color light output by the amplifier and a second moment when the display driving component 102 outputs an enable signal corresponding to the current primary color light are determined, a first duration is determined according to the first moment and the second moment, and the output of the enable signal corresponding to the subsequent primary color light is time-adjusted according to the first duration, thereby achieving synchronization.

[0244] Specifically, the control component is specifically used to receive the voltage conversion and Schmitt trigger combination ( Fig.12 The input / output (IO) level signal is obtained by converting the input / output (IO) level signal according to the triangle symbol in the figure. The IO level signal is generated according to the voltage signal of the bias voltage output by the amplifier. The control component can determine the first moment according to the IO level signal.

[0245] For example, for ease of understanding, it is taken that the current primary color light is red primary color light and the subsequent primary color light is green primary color light. Fig.15 It is a schematic diagram of adjusting the delay of the enable signal corresponding to the subsequent primary color light when there is a delay.

[0246] Furthermore, since the bias voltage controls the height of the micromirror of the phase light modulation device 1072, different wavelengths of relevant light waves correspond to different bias voltages. Within a certain bias voltage range, a slight voltage change affects a slight height change of the micromirror, and a slight height change causes a change in the position of the coherent speckle, thereby forming speckle. In order to further reduce the speckle:

[0247] In a possible implementation, the bias voltage is adjusted according to the first voltage signal to obtain a processed bias voltage, and the processed bias voltage is sent to the phase optical modulation device 1072. The first voltage signal is used to control the bias voltage to change within a target voltage range.

[0248] It can be understood that the bias voltage is transmitted to the phase optical modulator 1072 in the form of a continuous signal, that is, the bias voltage received by the phase optical modulator 1072 can be called a bias voltage signal. Specifically, the control component is also used to output a first voltage signal, and the amplifier is specifically used to superimpose the first voltage signal with the bias voltage signal to obtain a processed bias voltage signal, for example, Fig.16 As shown, Fig.16 It is a schematic diagram of the bias voltage without superimposing the first voltage signal and superimposing the first voltage signal, so that the processed bias voltage signal is input into the phase light modulator 1072 to drive the micromirror of the phase light modulator 1072 to vibrate slightly, corresponding to the rapid displacement of the diffraction image speckle, and the speckle contrast is reduced by time integration to achieve speckle reduction. Fig.17 Schematic diagram of the waveform of the enable signal and the bias voltage after the despeckle waveform is superimposed.

[0249] In one possible implementation, the display driving component 102 may send a control signal to the control component, and the control signal may be used to control the working mode of the control component, such as whether to superimpose the first voltage signal, or may specify the control component to perform despeckle processing on one or more colors of the three primary colors, as well as the amplitude and frequency of the despeckle waveform, etc.

[0250] In this embodiment, the phase light modulation module 107 includes: a dimming drive module 1071 and a phase light modulation device 1072, wherein the dimming drive module 1071 includes a dimming drive component 710 and a bias voltage conversion circuit 711, the bias voltage conversion circuit 711 is used to send a bias voltage to the phase light modulation device 1072 according to an enable signal, and the dimming drive component 710 is used to drive the micromirror of the phase light modulation device 1072 to move under the bias voltage according to a synchronization signal and a phase video signal to achieve phase modulation, so that when local backlight adjustment is achieved, the light energy is redistributed in space, and the peak brightness is increased and the dark field brightness is reduced.

[0251] Next, how the video processing component 106 determines the phase video signal according to the video signal is described in detail.

[0252] In a possible implementation, the video processing component 106 may generate a phase video signal according to the video signal sent by the main control chip 101 .

[0253] Specifically, the video processing component 106 can obtain multiple sub-video signals, and the multiple sub-video signals are generated based on the video signal. The specific implementation can refer to the above embodiment. For any sub-video signal, the brightness information of multiple sub-images in the sub-video signal is obtained, and the phase map information corresponding to the sub-video signal is generated according to the brightness information of the multiple sub-images. According to the phase map information corresponding to the multiple sub-video signals, a phase video signal is generated.

[0254] In another possible implementation, the video processing component 106 may obtain a brightness correction parameter, and generate a phase video signal according to the brightness correction parameter and the video signal.

[0255] Specifically, the video processing component 106 can obtain multiple sub-video signals, obtain brightness information of multiple sub-images in any sub-video signal, and generate phase image information corresponding to the sub-video signal according to the brightness information of the multiple sub-images and brightness correction parameters, and generate a phase video signal according to the phase image information corresponding to the multiple sub-video signals. Exemplarily, the brightness information can be a brightness value.

[0256] The brightness correction parameter includes first brightness correction parameters corresponding to multiple colors, namely, a first brightness correction parameter corresponding to R, a first brightness correction parameter corresponding to G, and a first brightness correction parameter corresponding to B. For example, taking R as an example, the first brightness correction parameter corresponding to R is as follows: Fig.18 As shown, Fig.18 The example is to divide the image into 3×3 image regions, and each number represents a brightness compensation parameter of an image region.

[0257] Exemplarily, for any sub-image in the R sub-video signal, Fig.18 As shown, the sub-image can be divided into 3×3 image areas, and then the brightness information of each image area is calculated. The numbers in each image area in the figure represent the brightness value. In a possible implementation, the brightness information of the center point of the image area can be obtained, and the brightness information of the image area is represented by the brightness information of the center point.

[0258] After obtaining the brightness information of the image area, the brightness compensation parameters of the corresponding area can be obtained. For example, the brightness information of image area 1 can be compared with Fig.18 The brightness compensation parameters of the corresponding image area (i.e., image area 1) in the image are multiplied together, so that the image area with low brightness increases the brightness, and the image area with high brightness decreases the brightness, so that part of the light in the central area is transferred to the corners, and the light intensity distribution of the illumination beam is adjusted, so as to compensate for the brightness of the darker area in the image, thereby improving the brightness uniformity of the final displayed image.

[0259] Next, how to obtain the brightness correction parameters is introduced in detail.

[0260] In a possible implementation, the video processing component 106 is further configured to:

[0261] The brightness information of the first image corresponding to the plurality of color charts is obtained, and the brightness correction parameter is determined according to the brightness information of the first image corresponding to the plurality of color charts.

[0262] The video processing component 106 may store brightness correction parameters for use in generating a phase video signal.

[0263] Exemplarily, the video processing component 106 may receive a first image sent by a brightness measurement device. The brightness measurement device may be a device with a specific shooting function or a brightness meter or other device, and the present application does not limit this.

[0264] In a possible implementation, the video processing component 106 is specifically configured to:

[0265] For a first image corresponding to any color card, the first image is divided into multiple image areas, and for any image area, first brightness information of the image area is obtained, and brightness compensation parameters corresponding to the multiple image areas are determined according to the first brightness information corresponding to the multiple image areas, and first brightness correction parameters corresponding to the color card are determined according to the brightness compensation parameters corresponding to the multiple image areas.

[0266] Specifically, for determining brightness compensation parameters corresponding to the plurality of image regions according to the first brightness information corresponding to the plurality of image regions, the video processing component 106 is specifically configured to:

[0267] Get the target matrix.

[0268] For any value in the target matrix, the value is divided by the first brightness information of the corresponding image area to obtain the brightness compensation parameter corresponding to the image area.

[0269] In a possible implementation, the target matrix may be determined based on the average value of the first brightness information of multiple image regions. It can be understood that the value of the target matrix may be a target parameter for uniform brightness distribution. Fig.19 The first target matrix is ​​shown.

[0270] In a possible implementation, the target matrix may also include different target parameters, and the target parameters corresponding to the darker image area and the target parameters corresponding to the brighter image area may be different to achieve local brightness adjustment. Fig.19 The second target matrix is ​​shown.

[0271] For example, a pure color chart can be projected on a projection screen by the laser TV 10, and the brightness measurement device can shoot the pure color chart to obtain a first image. Then the video processing component 106 can divide the first image into a plurality of image areas, for example, 9 image areas, 16 image areas or more image areas. The more image areas there are, the more refined the correction of the brightness uniformity of the image is.

[0272] For any image area, for example, the brightness information of the center point of the image area can be obtained, and then the brightness information of the center point can be represented as the brightness information of the image area. The center point can be the central pixel point of the image area, and the number of central pixel points can be one or more, and the present application does not impose any restrictions on this.

[0273] It can be understood that a red pure color picture card can obtain a first brightness correction parameter, a green pure color picture card can obtain a first brightness correction parameter, and a blue pure color picture card can obtain a first brightness correction parameter. The brightness adjustment component 109 can determine that the brightness correction parameter includes first brightness correction parameters corresponding to multiple colors, namely, a first brightness correction parameter corresponding to red, a first brightness correction parameter corresponding to green, and a first brightness correction parameter corresponding to blue.

[0274] In a possible implementation, after the brightness correction parameters are obtained, the brightness correction parameters may be verified, that is, the first brightness correction parameter corresponding to red, the first brightness correction parameter corresponding to green, and the first brightness correction parameter corresponding to blue may be verified respectively.

[0275] Specifically, for the first brightness correction parameter corresponding to any color card, determine whether the first brightness correction parameter meets the preset conditions. If not, correct the first brightness correction parameter corresponding to the pure color card to obtain the second brightness correction parameter. If the second brightness correction parameter meets the preset conditions, use the first brightness correction parameter corresponding to the color card as the second brightness correction parameter.

[0276] That is to say, for the first brightness correction parameter that does not meet the preset conditions, it is necessary to correct the brightness correction to obtain a corrected brightness correction parameter, i.e., the second brightness correction parameter. For the first brightness correction parameter that meets the preset conditions, it is not necessary to correct it, and the first brightness correction parameter corresponding to the color chart is used as the second brightness correction parameter, i.e., the first brightness correction parameter is equal to the second brightness correction parameter.

[0277] The preset condition is that the brightness of the first image after brightness correction is performed according to the first brightness correction parameter is evenly distributed.

[0278] Taking the first brightness correction parameter corresponding to red as an example, the brightness of the first image corresponding to the red chart is corrected according to the first brightness correction parameter, and the corrected first image is divided into multiple image areas. The brightness information of each image area is determined, and then the difference in brightness values ​​between any two image areas is calculated. If the difference is less than a preset threshold, it can be determined that the brightness of the first image after brightness correction is uniformly distributed.

[0279] In a possible implementation, the first brightness correction parameter is corrected as follows:

[0280] Exemplarily, for the first brightness correction parameter corresponding to any color card, for example, when the image processing component 106 generates the first brightness correction parameter, it divides the first image corresponding to the color card into 9 image regions.

[0281] Then, for the correction of the first brightness correction parameter, the image processing component 106 is specifically used to:

[0282] The first image corresponding to the color chart is divided into 16 image areas. For any image area, the third brightness information of the image area is obtained, and the brightness compensation parameters corresponding to the image area are determined according to the third brightness information. According to the brightness compensation parameters corresponding to multiple image areas, the corrected first brightness correction parameters can be determined.

[0283] In this embodiment, the video processing component 106 can determine the first brightness correction parameters corresponding to different colors based on the first image corresponding to the three-color pure color card, so that after the video signal is subsequently decomposed into R sub-video signal, G sub-video signal and B sub-video signal, for example, the first-level brightness correction parameter corresponding to R can be used to perform brightness compensation on the R sub-image in the R sub-video signal, and then generate the phase map information corresponding to R based on the R sub-image after brightness compensation, thereby improving the brightness uniformity of the final displayed image.

[0284] Fig. 20 The following is a flow chart of a method for adjusting the local backlight of a laser TV provided in an embodiment of the present application. The structure of the laser TV can refer to the above embodiment, such as Fig. 20 As shown, the method comprises the following steps:

[0285] S101, sending a synchronization signal to a laser driving component and a phase light modulation module according to a video signal through a display driving component, and sending a display driving signal to a light modulation component according to the video signal.

[0286] S102 , sending a light source driving signal to the light source assembly according to the synchronization signal through the laser driving assembly, and driving the light source assembly to light up according to the light source driving signal to emit primary color light.

[0287] S103 . Sending a phase video signal to a phase light modulation module according to the video signal through a video processing component.

[0288] S104, determining a bias voltage according to the synchronization signal through a phase light modulation module, and performing phase light modulation on the primary color light according to the phase video signal and the bias voltage, so as to emit modulated light to the light modulation component.

[0289] S105 . Display an image based on the modulated light through a light modulation component to achieve local backlight adjustment.

[0290] S106, obtaining a bias voltage through a control component in the phase light modulation module, and performing voltage correction on a target voltage corresponding to subsequent primary color lights according to the bias voltage, and the corrected target voltage is used to determine a bias voltage corresponding to subsequent primary color lights.

[0291] The embodiment of the present application provides a local backlight adjustment method for a laser television, the implementation principle and technical effects of which are similar and will not be repeated here.

[0292] The present application also provides a computer-readable storage medium, which may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes. Specifically, the computer-readable storage medium stores program instructions, and the program instructions are used for the methods in the above embodiments.

[0293] The present application also provides a program product, which includes an execution instruction, which is stored in a readable storage medium. At least one control module of the display device can read the execution instruction from the readable storage medium, and at least one control module executes the execution instruction so that the display device implements the methods provided by the various embodiments described above.

[0294] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

[0295] For ease of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or limit the embodiments to the specific forms disclosed above. Based on the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are intended to better explain the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. A laser television, characterized in that: The laser TV comprises: a main control chip, a display driving component, a light modulation component, a light source component, a laser driving component, a phase light modulation module and a video processing component; The main control chip is used to generate a video signal according to an external video source; The display driving component is connected to the light modulation component, the laser driving component and the phase light modulation module respectively, and the display driving component is used to obtain the video signal, and send a synchronization signal to the laser driving component and the phase light modulation module according to the video signal, and send a display driving signal to the light modulation component according to the video signal; The laser driving component is connected to the light source component, and the laser driving component is used to send a light source driving signal to the light source component according to the synchronization signal to drive the light source component to light up and emit primary color light; The video processing component is connected to the main control chip and the phase light modulation module respectively; the video processing component is used to send a phase video signal to the phase light modulation module according to the video signal; The phase light modulation module is used to determine a bias voltage according to the synchronization signal, and to perform phase light modulation on the primary color light according to the phase video signal and the bias voltage, so as to emit modulated light to the light modulation component; The light modulation component is used to display an image based on the modulated light The phase light modulation module includes a control component, which is used to obtain the bias voltage and perform voltage correction on a target voltage corresponding to subsequent primary color lights according to the bias voltage. The corrected target voltage is used to determine the bias voltage corresponding to the subsequent primary color lights.

2. The laser TV according to claim 1, characterized in that: The synchronization signal includes an enable signal and a PWM signal; The phase light modulation module further includes: a phase light modulation device and a dimming driving module; The dimming driving module is connected to the phase light modulation device, and the dimming driving module is used to: Determining the bias voltage according to the enable signal; A dimming drive signal is sent to the phase light modulation device according to the phase video signal, the PWM signal and the enable signal, wherein the dimming drive signal includes the bias voltage.

3. The laser TV according to claim 2, characterized in that: The dimming driving module includes: a dimming driving component and a bias voltage conversion circuit; The display driving component is connected to the dimming driving component and the bias voltage conversion circuit respectively; the display driving component is specifically used for: Sending the synchronization signal to the dimming driving component; sending the enable signal to the bias voltage conversion circuit; Performing digital-to-analog conversion on the PWM signal to obtain a converted PWM signal; Sending the converted PWM signal and the enable signal to the laser driving component; The laser driving component is specifically used to generate the light source driving signal according to the converted PWM signal and the enable signal; The bias voltage conversion circuit is connected to the phase optical modulation device, and the bias voltage conversion circuit is used to send the bias voltage to the phase optical modulation device according to the enable signal; The dimming driving component is connected to the phase light modulation device; the dimming driving component is used to drive the micromirror of the phase light modulation device to move under the bias voltage according to the synchronization signal and the phase video signal.

4. The laser TV according to claim 3, characterized in that: The bias voltage conversion circuit comprises: the control component, a digital-to-analog converter DAC and an amplifier; The control component is connected to the display driving component and the DAC respectively, and the display driving component is specifically used to send the enable signal to the control component; The control component is used to input a target voltage corresponding to the primary color light to the DAC according to the enable signal; The DAC is used to convert the target voltage into a voltage analog signal; The amplifier is connected to the DAC and the phase optical modulation device respectively, and the amplifier is used to send the bias voltage to the phase optical modulation device according to the voltage analog signal.

5. The laser TV according to claim 4, characterized in that: The control component is further used to output a first voltage signal; The amplifier is specifically used to adjust the bias voltage according to the first voltage signal to obtain a processed bias voltage, and send the processed bias voltage to the phase optical modulation device. The first voltage signal is used to control the bias voltage to change within a target voltage range.

6. The laser TV according to claim 4 or 5, characterized in that: The amplifier is connected to the control component; The amplifier is further used to send the bias voltage to the control component, so that the control component corrects the target voltage corresponding to the subsequent primary color light according to the bias voltage.

7. The laser TV according to claim 6, characterized in that: The control component is also used for: Determine a first moment of a bias voltage corresponding to a current primary color light output by the amplifier; Determine a second time when the display driving component outputs an enable signal corresponding to the current primary color light; Determine a first duration according to the first moment and the second moment; The output time of the subsequent enable signal corresponding to the primary color light is adjusted according to the first time length.

8. The laser TV according to any one of claims 1 to 7, characterized in that: The video processing component is specifically used for: Acquire a plurality of sub-video signals, wherein the plurality of sub-video signals are obtained after decoding the video signal; For any sub-video signal, determining a phase information signal corresponding to the sub-video signal; The phase video signal is determined according to phase information signals corresponding to a plurality of sub-video signals.

9. The laser TV according to claim 8, characterized in that: The video processing component is specifically used for: Acquire a first resolution of the phase light modulation device; According to the first resolution, pixel compression is performed on an image in the video signal having a resolution higher than the first resolution, so that the resolution of the pixel-compressed image matches the first resolution.

10. A method for adjusting local backlight of a laser TV, characterized in that: The laser TV comprises: a main control chip, a display driving component, a light modulation component, a light source component, a laser driving component, a phase light modulation module and a video processing component, wherein the phase light modulation module comprises a control component; The display driving component is connected to the light modulation component, the phase light modulation module and the laser driving component respectively; the laser driving component is connected to the light source component; the video processing component is connected to the main control chip and the phase light modulation module respectively; The method comprises: Acquire a video signal through the display driving component, and send a synchronization signal to the laser driving component and the phase light modulation module according to the video signal, and send a display driving signal to the light modulation component according to the video signal; Determine a light source driving signal through the laser driving component, and drive the light source component to light up according to the light source driving signal to emit primary color light to the phase light modulation module; Sending a phase video signal to the phase light modulation module according to the video signal through the video processing component; Determining a bias voltage according to the synchronization signal through the phase light modulation module, and performing phase light modulation on the primary color light according to the phase video signal and the bias voltage, so as to emit modulated light to the light modulation component; Displaying an image based on the modulated light by means of the light modulation component; The bias voltage is obtained through a control component, and a voltage correction is performed on a target voltage corresponding to subsequent primary color lights according to the bias voltage. The corrected target voltage is used to determine a bias voltage corresponding to subsequent primary color lights.

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