CN113362776A - Field sequence display device, control method and display equipment - Google Patents
Field sequence display device, control method and display equipment Download PDFInfo
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- CN113362776A CN113362776A CN202110737421.2A CN202110737421A CN113362776A CN 113362776 A CN113362776 A CN 113362776A CN 202110737421 A CN202110737421 A CN 202110737421A CN 113362776 A CN113362776 A CN 113362776A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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Abstract
The invention discloses a field sequence display device, a control method and display equipment, wherein the field sequence display device comprises an image processing module, a driving module and a display module, wherein the display module comprises a liquid crystal display panel and a backlight display unit; the image processing module is connected with the driving module to extract and obtain three-primary-color sub-images and local brightness adjusting parameters from the source image data and send the three-primary-color sub-images and the local brightness adjusting parameters to the driving module; the driving module is connected with the display module to drive the liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images and drive the backlight display unit to emit light according to the local brightness adjusting parameter; the display module outputs image frame signals and liquid crystal scanning signals to the driving module so as to control the driving module to achieve time sequence matching of the driving signals of the liquid crystal display panel and the backlight display unit. The invention provides a field sequence display device, a control method and display equipment which can ensure the quality of displayed images on the basis of reducing power consumption.
Description
Technical Field
The invention relates to the technical field of display, in particular to a field sequence display device, a control method and display equipment.
Background
The liquid crystal display mainly adopts a liquid crystal display panel on which a color film of three primary colors RGB is arranged, and light emitted by a backlight penetrates through a liquid crystal layer and then is transmitted out through the color film, so that a color image is realized.
However, the color film layer blocks about 70% of the backlight, and in order to increase the display brightness, the power consumption of the backlight unit of the display module needs to be increased, which results in large power consumption.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a field sequential display device, a control method, and a display apparatus that overcome or at least partially solve the above problems.
In a first aspect, a field sequential display device is provided, including:
the display module comprises a liquid crystal display panel and a backlight display unit with three primary colors;
the image processing module is connected with the driving module, wherein the image processing module extracts and obtains three primary color sub-images and local brightness adjusting parameters from source image data and sends the three primary color sub-images and the local brightness adjusting parameters to the driving module;
the driving module is connected with the display module to drive the liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images and drive the backlight display unit to emit light according to the local brightness adjusting parameter;
the display module outputs an image frame signal representing the switching time sequence of three primary colors and a liquid crystal scanning signal representing the scanning time sequence of the liquid crystal display panel to the driving module so as to control the driving module to achieve time sequence matching of the driving signals of the liquid crystal display panel and the backlight display unit.
Optionally, the image processing module includes: the device comprises an image extraction unit, an image stripping unit, an image algorithm unit and a backlight algorithm unit; the image extraction unit is connected with the image stripping unit so as to extract a color image from the source image data and send the color image to the image stripping unit; the image stripping unit is respectively connected with the image algorithm unit and the backlight algorithm unit so as to extract gray scale parameters of three primary color sub-pixels of the color image and send the gray scale parameters of the three primary color sub-pixels to the image algorithm unit and the backlight algorithm unit; the image algorithm unit is connected with the driving module to fuse the three primary color subgraphs according to the three primary color sub-pixel gray scale parameters and send the three primary color subgraphs to the driving module; the backlight algorithm unit is connected with the driving module to analyze the local brightness adjusting parameter according to the gray scale parameters of the three primary color sub-pixels and send the local brightness adjusting parameter to the driving module.
Optionally, the driving module includes: a display driving unit and a backlight driving unit; the display driving unit is connected between the image processing module and the liquid crystal display panel to convert the received three-primary-color sub-images into standard image signals of the liquid crystal display panel and drive the liquid crystal of the liquid crystal display panel to deflect according to the standard image signals; the backlight driving unit is connected between the image processing module and the backlight display unit so as to analyze the received local brightness adjusting parameter into an electric control signal and drive the backlight display unit to emit light according to the electric control signal; wherein a timing of the standard image signal and a timing of the electric control signal are matching timings set according to the image frame signal and the liquid crystal scanning signal.
Optionally, the backlight driving unit includes: the micro-control unit and the diode driving circuit; the micro control unit is connected between the image processing module and the diode driving circuit so as to analyze the received local brightness adjusting parameter into an electric control signal and configure the working parameter of the diode driving circuit; the diode driving circuit is connected with the backlight display unit to output a backlight scanning signal to drive the backlight display unit to emit light based on the working parameter and the received electric control signal.
Optionally, the diode driving circuit includes: the light emitting diodes of the backlight display unit are arranged into light emitting arrays of n rows and 3 x m columns, the light emitting color of each column of light emitting diodes is the same, and the light emitting colors of three adjacent columns of light emitting diodes are three primary colors respectively; the n row-scanning switches are connected with the n rows of light-emitting arrays in a one-to-one correspondence manner, and each row-scanning switch is connected with the anode of the light-emitting diode in the same row; the 3 m driving channels are correspondingly connected with the 3 m columns of light emitting arrays one by one, and each driving channel is connected with the cathode of the light emitting diode in the same column.
Optionally, the micro control unit sends a working synchronization signal to the diode driving circuit to control the frequency at which the diode driving circuit drives the backlight display unit, wherein the frequency of the working synchronization signal is equal to the frame rate of the three primary color sub-images.
Optionally, the backlight driving unit further includes: the backlight display unit comprises 3 x n external row scan switches, wherein the light emitting diodes of the backlight display unit are arranged into light emitting arrays of 3 x n rows and m columns, the light emitting color of each row of light emitting diodes is the same, and the light emitting colors of three adjacent rows of light emitting diodes are three primary colors respectively; the micro control unit is connected with the 3 x n external row-scanning switches, the 3 x n external row-scanning switches are correspondingly connected with the 3 x n rows of light-emitting arrays one by one, and each external row-scanning switch is connected with the anode of the same row of light-emitting diodes; the diode driving circuit comprises m driving channels, the m driving channels are connected with the m columns of light emitting arrays in a one-to-one correspondence mode, and each driving channel is connected with the cathode of the light emitting diode in the same column.
Optionally, the micro control unit sends a working synchronization signal to the diode driving circuit to control the frequency at which the diode driving circuit drives the backlight display unit, wherein the frequency of the working synchronization signal is n times of the frame rate of the three primary color sub-image.
Optionally, in the process of driving the backlight display unit to emit light by the driving module, a delay time exists in the starting backlight line scanning time corresponding to each frame of three-primary-color sub-image, where the delay time is greater than or equal to the steady-state response time of the liquid crystal display panel, relative to the starting liquid crystal line scanning time corresponding to each frame of three-primary-color sub-image.
In a second aspect, a method for controlling a field sequential display apparatus is provided, including:
extracting and obtaining three-primary-color sub-images and local brightness adjusting parameters from source image data;
driving liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images, and driving a backlight display unit of three primary colors to emit light according to the local brightness adjusting parameter;
the signal for driving the liquid crystal display panel and the signal for driving the backlight display unit are controlled to achieve time sequence matching according to an image frame signal and a liquid crystal scanning signal, wherein the image frame signal represents the switching time sequence of three primary colors, and the liquid crystal scanning signal represents the scanning time sequence of the liquid crystal display panel.
In a third aspect, a display device is provided, which includes the field sequential display apparatus of the first aspect.
In a fourth aspect, a virtual reality display device is provided, which includes the field sequential display apparatus of the first aspect.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
the field sequential display device, the control method and the display equipment provided by the embodiment of the invention are characterized in that the image processing module is arranged to extract and obtain three-primary-color sub-images and local brightness adjusting parameters from source image data and send the three-primary-color sub-images and the local brightness adjusting parameters to the driving module. The driving module drives the liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images and drives the backlight display unit to emit light according to the local brightness adjusting parameter, so that color patterns can be displayed without setting a color film, the transmittance of the display module and the backlight lighting effect are effectively improved, and the power consumption is further reduced. And the display module is also arranged to output image frame signals and liquid crystal scanning signals to the driving module to control the driving module to achieve time sequence matching on the driving signals of the liquid crystal display panel and the backlight display unit so as to avoid dynamic afterglow effect and image blurring phenomenon and ensure the quality of displayed images on the basis of reducing power consumption.
Due to the field sequence display device, the control method and the display equipment, the quality of displayed images is guaranteed, the transmittance of the display module is effectively improved, the power consumption is reduced, and the field sequence display device, the control method and the display equipment are suitable for virtual reality display devices and equipment with higher requirements on pixel density and resolution.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a block diagram of a field sequential display device according to an embodiment of the present invention;
FIG. 2 is a timing diagram of a backlight of a field sequential display device according to an embodiment of the present invention;
FIG. 3 is a first schematic connection diagram of a field sequential display device according to an embodiment of the present invention;
FIG. 4 is a timing diagram illustrating a backlight of the apparatus shown in FIG. 3 according to an embodiment of the present invention;
FIG. 5 is a second schematic view illustrating a connection of a field sequential display device according to an embodiment of the present invention;
FIG. 6 is a timing diagram illustrating the backlight of the apparatus shown in FIG. 5 according to an embodiment of the present invention;
FIG. 7 is a flowchart illustrating a method for controlling a field sequential display device according to an embodiment of the present invention;
fig. 8 is a structural diagram of a display device in an embodiment of the present invention;
fig. 9 is a structural diagram of a virtual reality display device in an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The present invention provides a field sequential display device, please refer to fig. 1, which is a structural diagram of a field sequential display device 01 according to an embodiment of the present invention, including:
the display device comprises an image processing module 10, a driving module 20 and a display module 30, wherein the display module 30 comprises a liquid crystal display panel 310 and a backlight display unit 320 with three primary colors;
the image processing module 10 is connected to the driving module 20, wherein the image processing module 10 extracts and obtains three primary color sub-images and local brightness adjustment parameters from the source image data, and sends the three primary color sub-images and the local brightness adjustment parameters to the driving module 20;
the driving module 20 is connected to the display module 30 to drive the liquid crystal deflection of the liquid crystal display panel 310 according to the three primary color sub-images and to drive the backlight display unit 320 to emit light according to the local brightness adjustment parameter;
the display module 30 outputs an image frame signal representing a switching timing sequence of three primary colors and a liquid crystal scanning signal representing a scanning timing sequence of the liquid crystal display panel to the driving module 20, so as to control the driving module 20 to achieve timing matching of driving signals of the liquid crystal display panel 310 and the backlight display unit 320.
It should be noted that the image processing module 10 and the driving module 20 may be separate modules as shown in fig. 1, or may be integrated into the same module, which is not limited herein.
The specific structure and interaction of the image processing module 10, the driving module 20 and the display module 30 are further described below.
The display module 30 includes a liquid crystal display panel 310 and a backlight display unit 320 with three primary colors, and may further include an upper polarizer and a lower polarizer respectively disposed on two sides of the liquid crystal display panel 310. The liquid crystal display panel 310 may be a monochrome color-free panel, and the backlight display unit 320 may be a three-primary-color backlight (e.g., a three-primary-color mini-LED backlight or a micro-LED backlight), and may switch three colors of red (R), green (G), and blue (B). Under the control of the image processing module 10 and the driving module 20, the liquid crystal display panel 310 sequentially displays the three primary color sub-images of a frame of color source image on the liquid crystal screen, and then correspondingly switches the backlights of three colors in cooperation with the backlight display unit 320, so that a synthesized complete frame of color image can be viewed due to the visual inertia effect of human eyes. Therefore, light emitted by the backlight display unit 320 does not need to pass through a color film, the transmittance of the display module 30 and the backlight lighting effect can be improved, and further, the power consumption and the cost are reduced.
In an alternative embodiment, as shown in fig. 1, the image processing module 10 may include an image extraction unit 110, an image peeling unit 120, an image algorithm unit 130, and a backlight algorithm unit 140.
Specifically, after acquiring source image data that needs to be displayed, image extraction section 110 extracts a color image from the source image data. Taking the source image data as the video data as an example, the image extraction unit 110 sequentially extracts the color images from the video data by frames, and then sends the color images of the current frame to the image stripping unit 120. The image stripping unit 120 extracts gray scale parameters of the three primary color sub-pixels from the color image, specifically, the gray scale parameter of the R channel, the gray scale parameter of the G channel, and the gray scale parameter of the B channel, where the gray scale parameter of each channel includes coordinate distribution of each specific gray scale value of the channel on the sub-image. Then, the image peeling unit 120 sends the three primary color sub-pixel gray scale parameters to the image algorithm unit 130 and the backlight algorithm unit 140.
The image algorithm unit 130 fuses three primary color sub-images according to the three primary color sub-pixel gray scale parameters, that is, respectively fuses a sub-image of an R channel, a sub-image of a G channel, and a sub-image of a B channel, and then sends the three primary color sub-images to the driving module 20 through the image interface. The backlight algorithm unit 140 analyzes the gray scale parameters of the three primary color sub-pixels to obtain local brightness adjustment parameters of the RGB backlight, where the local brightness adjustment parameters include coordinate distribution of each specific brightness value of the channel on the sub-image. The local brightness adjustment parameter is then sent to the driving module 20 through the backlight interface.
Of course, in a specific implementation process, the image extraction unit 110, the image peeling unit 120, the image algorithm unit 130, and the backlight algorithm unit 140 may be separately disposed units as shown in fig. 1, or may be integrated into the same chip or the same unit, which is not limited herein.
In an alternative embodiment, as shown in fig. 1, the driving module 20 includes a display driving unit 210 and a backlight driving unit 220.
Specifically, the display driving unit 210 may be connected to the image algorithm unit 130 in fig. 1, and receive the three-primary-color sub-images transmitted by the image algorithm unit 130, wherein the connection Interface between the display driving unit 210 and the image algorithm unit 130 is an image Interface, for example, a standard video Interface such as a High Definition digital display Interface (DP) or a High Definition Multimedia Interface (HDMI). The display driving unit 210 converts the three primary color sub-images into a standard image signal of the liquid crystal display panel, for example, the standard image signal is a Mobile Industry Processor Interface (MIPI) image signal. Then, the standard image signal is transmitted to the liquid crystal display panel 310 to control liquid crystal deflection to realize display of an image shape.
The backlight driving unit 220 may be connected to the backlight algorithm unit 140 in fig. 1, and receive the local brightness adjustment parameter sent by the backlight algorithm unit 140, and analyze the local brightness adjustment parameter to convert the local brightness adjustment parameter into an electrical control signal such as a voltage or a current. The backlight driving unit 220 controls the light emitting brightness and the light emitting color of the light emitting diodes of each local area on the backlight display unit 320 through an electric control signal, thereby implementing the driving of the backlight display unit 320.
It should be noted that, in order to ensure the quality of image display and avoid the dynamic afterglow effect and the image blurring phenomenon, it is necessary to ensure the synchronization of the driving of the liquid crystal display panel 310 by the display driving unit 210 and the driving of the backlight display unit 320 by the backlight driving unit 220. The timing of the standard image signal and the timing of the electric control signal may be adjusted based on the image frame signal and the liquid crystal scanning signal to achieve matching.
Specifically, please refer to fig. 2, which is a timing diagram of the backlight of the field sequential display device according to the embodiment of the present invention. The VSYNC signal is a display image frame signal sent by the display module 30 to the driving module 20, and represents the switching timing sequence of three primary colors, wherein the high level of each pulse is the switching time node of three primary colors RGB, i.e. the initial position of each frame of three-primary-color sub-image, and three frames of three-primary-color sub-images with different primary colors constitute an effective color image. The TE signal is a liquid crystal scanning signal issued by the display module 30 to the image processing module 10 and/or the driving module 20, and represents a scanning timing sequence of the liquid crystal display panel, wherein the low level region is an actual line scanning time period of the liquid crystal display panel. The DATA signal is a timing signal for the image processing module 10 to output the local brightness adjustment parameter to the driving module 20, wherein the high level region is an output time period of the local brightness adjustment parameter corresponding to the frame of the three primary color sub-image. R _ BL, G _ BL, and B _ BL are backlight scanning signals for the driving module 20 to control the backlight display unit 320, wherein the high level region is a backlight scanning period of the backlight scanning signals, and the backlight scanning signals are determined according to the electric control signal.
In an alternative embodiment, as shown in fig. 2, when the driving module 20 drives the backlight display unit 320 to emit light during the driving display process of each frame of sub-images of the three primary color sub-images, the starting backlight line scanning time (i.e., the high-level rising edge of the backlight scanning signal R _ BL, G _ BL, or B _ BL) corresponding to each frame of the three primary color sub-images has a delay time T1 relative to the starting liquid crystal line scanning time (i.e., the falling edge of the TE signal) corresponding to the frame of the three primary color sub-images, and the delay time T1 is greater than or equal to the steady-state response time of the liquid crystal display panel 310, so as to avoid the dynamic afterglow effect and the image blurring phenomenon caused by the unstable interaction between the liquid crystal line scanning and the backlight line scanning.
Of course, in a specific implementation process, the display driving unit 210 and the backlight driving unit 220 may be separately disposed units as shown in fig. 1, or may be integrated into the same chip or the same unit, which is not limited herein.
In an alternative embodiment, as shown in fig. 3 to 6, a bridge driving IC may be disposed in the display driving unit 210, and the bridge driving IC is configured to convert the three primary color sub-images into a standard image signal of the liquid crystal display panel, where the standard image signal is the MIPI signal in fig. 4 and 6, and the raised area in the MIPI signal is a period of time when the display driving unit 210 outputs a valid image. Moreover, the display driving unit 210 can receive the VSYNC signal sent by the display module 30, so that the signal timings of the three primary color sub-images sent by the image processing module 10 and the local brightness adjustment parameter (DATA signal) are matched. The display driving unit 210 may further receive the TE signal sent by the display module 30, and send the TE signal to the backlight driving unit 220, so that the signal timings of the TE signal and the backlight scanning signal output by the backlight driving unit 220 are matched, thereby ensuring synchronization of backlight scanning and liquid crystal scanning.
In an alternative embodiment, as shown in fig. 3 to 6, the backlight driving Unit 220 may include a Micro Controller Unit (MCU) 221 and a diode driving circuit 222. The micro control unit 221 is connected between the image processing module 10 and the diode driving circuit 222, and is configured to analyze the received local brightness adjustment parameter into an electrical control signal and configure the operating parameter of the diode driving circuit 222. The diode driving circuit 222 is connected to the backlight display unit 320 to output a backlight scanning signal to drive the backlight display unit 320 to emit light based on the operating parameters and the received electrical control signal.
There may be various arrangements of the three primary color leds of the backlight display unit 320, and there may also be various connections and driving manners between the corresponding backlight driving unit 220 and the backlight display unit 320, which are listed as two examples below:
first, the backlight display unit 320 is independently driven by the diode driving circuit 222.
As shown in fig. 3, n row scan switches are provided in the diode driving circuit 222: SW 1-SWn, and 3 × m drive channels: CH 1-CH (m 3). Correspondingly, the leds of the backlight display unit 320 are arranged in n rows and 3 × m columns of light emitting arrays, the light emitting colors of each column of leds are the same, and the light emitting colors of three adjacent columns of leds are three primary colors, respectively. For example, as shown in fig. 3, the first column is a light emitting diode emitting red (R), the second column is a light emitting diode emitting green (G), and the third column is a light emitting diode emitting blue (B), which are arranged in this order.
The n row scan switches of the diode driving circuit 222 are connected to the n rows of light emitting arrays in a one-to-one correspondence, where each row scan switch is connected to the anodes of the same row of light emitting diodes in the corresponding row, that is, the light emitting diodes in the same row in the backlight display unit 320 share the anode and the anodes are all connected to the corresponding row scan switches. For example, SW1 is connected to the anodes of all the row 1 LEDs of the light emitting array, SW2 is connected to the anodes of all the row 2 LEDs of the light emitting array … …, and SWn is connected to the anodes of all the row n LEDs of the light emitting array.
The 3 × m driving channels of the diode driving circuit 222 are connected to the 3 × m columns of light emitting arrays in a one-to-one correspondence, where each driving channel is connected to the cathode of the same column of light emitting diodes in the corresponding column, that is, the light emitting diodes in the same column in the backlight display unit 320 share the cathode and the cathodes are all connected to the corresponding driving channels. For example, CH1 is connected to the cathodes of all the 1 st columns of leds of the light emitting array, CH2 is connected to the cathodes of all the 2 nd columns of leds of the light emitting array … …, and CH (m × 3) is connected to the cathodes of all the 3 × m columns of leds of the light emitting array.
The backlight driving unit 220 may further include an internal or external power supply for supplying power to the micro control unit 221 and the diode driving circuit 222.
Specifically, as shown in fig. 3 and 4, the micro control unit 221 determines an operation synchronization signal (i.e., VSYNC _1 signal) of the diode driving circuit 222 according to the VSYNC signal (or a DATA signal generated based on the VSYNC signal), and transmits the VSYNC _1 signal to the diode driving circuit 222 as an operation parameter of the diode driving circuit 222, so as to control the timing of the row scan switch of the diode driving circuit 222 and the backlight scanning signal of the driving channel, i.e., control the frequency at which the diode driving circuit 222 drives the backlight display unit 320. The frequency of the VSYNC _1 signal is equal to the frame rate of the three primary color sub-image, so as to match the timing sequence of the backlight scanning and the liquid crystal scanning. The micro-control unit 221 further parses the local brightness adjustment parameter (i.e., DATA signal) into the electrical control signals (i.e., RGB _ DATA signals) of the voltage and/or current that can be recognized by the backlight display unit 320, so that the diode driving circuit 222 can output the backlight scanning signals (including the backlight line scanning signals such as R _ BL _ SW 1-R _ BL _ SWn, G _ BL _ SW 1-G _ BL _ SWn, B _ BL _ SW 1-B _ BL _ SWn) to drive the backlight display unit 320 to emit light by line scanning based on the operating parameter (VSYNC _1 signal) and the received electrical control signals (RGB _ DATA signals). The delay time of the backlight line scanning start time of the current frame three primary color sub-image relative to the falling edge of the TE signal is T1, and T1 is greater than or equal to the steady-state response time of the liquid crystal display panel 310, so as to avoid the dynamic afterglow effect and the image blurring phenomenon caused by the unstable interaction of the liquid crystal line scanning and the backlight line scanning.
By adopting the method to drive the backlight display unit 320, only the driving code of the diode driving circuit 222 needs to be preset, and no additional driving hardware needs to be arranged, so that the design difficulty of engineers can be effectively reduced.
Second, the backlight display unit 320 is driven by the micro control unit 221, the external row scan switch 223 and the diode driving circuit 222 in cooperation.
As shown in fig. 5, the backlight driving unit further includes 3 × n external row scan switches 223: Q1-Q (n x 3). The mcu 221 is connected to the 3 × n external row scan switches 223, for example, by General-purpose input/output (GPIO) ports. The diode driver circuit 222 has m driver channels built therein: CH 1-CHm. Correspondingly, the light emitting diodes of the backlight display unit 320 are arranged in light emitting arrays of 3 × n rows and m columns, the light emitting colors of the light emitting diodes in each row are the same, and the light emitting colors of the adjacent three rows of light emitting diodes are the three primary colors respectively. For example, as shown in fig. 5, a first row is a light emitting diode emitting red (R) light, a second row is a light emitting diode emitting green (G) light, and a third row is a light emitting diode emitting blue (B) light, which are arranged in order.
The 3 × n external row-scan switches 223 are connected to the 3 × n row light-emitting arrays in a one-to-one correspondence, where each external row-scan switch 223 is connected to the anodes of the same row of light-emitting diodes in the corresponding row, that is, the light-emitting diodes in the same row in the backlight display unit 320 are common anodes and the anodes are all connected to the corresponding external row-scan switches 223. For example, Q1 is connected to the anodes of all the leds in row 1 of the light emitting array, Q2 is connected to all the anodes of all the leds in row 2 of the light emitting array … …, and Q (n × 3) is connected to all the anodes of all the leds in row 3 × n of the light emitting array.
The m driving channels of the diode driving circuit 222 are connected to the m columns of light emitting arrays in a one-to-one correspondence, wherein each driving channel is connected to the cathodes of the same column of light emitting diodes in the corresponding column. That is, the light emitting diodes in the same column of the backlight display unit 320 share a cathode and the cathodes are connected to the corresponding driving channels. For example, CH1 is connected to the cathodes of each of the 1 st column leds of the light emitting array, CH2 is connected to the cathodes of each of the 2 nd column leds of the light emitting array … …, and CHm is connected to the cathodes of each of the m column leds of the light emitting array.
The backlight driving unit 220 may further include an internal or external power supply for supplying power to the micro control unit 221, the external scan switch 223, and the diode driving circuit 222.
Specifically, as shown in fig. 5 and 6, the micro control unit 221 determines an operation synchronization signal (i.e., VSYNC _2 signal) of the diode driving circuit 222 according to the VSYNC signal (or a DATA signal generated based on the VSYNC signal), and transmits the VSYNC _2 signal to the diode driving circuit 222 as an operation parameter of the diode driving circuit 222, so as to control the timing of column driving of the diode driving circuit 222, i.e., control the frequency at which the diode driving circuit 222 drives the backlight display unit 320. The frequency of the VSYNC _2 signal is n times of the frame rate of the three-primary-color sub-image, and n is the number of backlight line scans corresponding to one frame of the three-primary-color sub-image, i.e., one third of the number of light emitting diodes of the backlight display unit 320, so as to ensure that the backlight column driving meets the frequency requirement of backlight line scanning, and achieve the time sequence matching of backlight scanning and liquid crystal scanning.
The micro control unit 221 also parses the local brightness adjustment parameter (i.e., the DATA signal) into electrical control signals of voltages and/or currents that can be recognized by the backlight display unit 320, and not only sends the electrical control signals to the diode driving circuit 222, so that the diode driving circuit 222 can output backlight column driving signals based on the operating parameter (VSYNC _2 signal) and the received electrical control signals (RGB _ DATA signal). In addition, the micro control unit 221 further drives the external row scan switch 223 according to the electrical control signal, so that the external row scan switch 223 drives the row scan of the backlight display unit 320 at the backlight row scan timings of R _ BL _ Q1 to R _ BL _ Q (n × 3-2), G _ BL _ Q2 to G _ BL _ Q (n × 3-1), and B _ BL _ Q3 to B _ BL _ Q (n × 3), respectively. The delay time of the backlight line scanning start time of the current frame three primary color sub-image relative to the falling edge of the TE signal is T1, and T1 is greater than or equal to the steady-state response time of the liquid crystal display panel 310, so as to avoid the dynamic afterglow effect and the image blurring phenomenon caused by the unstable interaction of the liquid crystal line scanning and the backlight line scanning.
By driving the backlight display unit 320 in this way, the requirements on the functions and hardware configuration of the diode driving circuit 222 are low, and the acquisition cost of the diode driving circuit 222 can be effectively reduced.
Of course, in the implementation process, the connection and driving manner of the backlight driving unit 220 and the backlight display unit 320 are not limited to the above two manners, for example, the diode driving circuit 222 may be used to perform row scanning driving on the led array of the backlight display unit 320, and an external driving channel may be used to perform column driving on the led array of the backlight display unit 320, which is not limited herein and is not to be listed.
The image processing module extracts and obtains three-primary-color sub-images and local brightness adjusting parameters from source image data, and sends the three-primary-color sub-images and the local brightness adjusting parameters to the driving module. The driving module drives the liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images and drives the backlight display unit to emit light according to the local brightness adjusting parameter, so that color patterns can be displayed without setting a color film, the transmittance of the display module and the backlight lighting effect are effectively improved, and the power consumption is further reduced. And the display module is also arranged to output image frame signals and liquid crystal scanning signals to the driving module to control the driving module to achieve time sequence matching on the driving signals of the liquid crystal display panel and the backlight display unit so as to avoid dynamic afterglow effect and image blurring phenomenon and ensure the quality of displayed images on the basis of reducing power consumption.
Based on the same inventive concept, an embodiment of the present invention further provides a method for controlling a field sequential display apparatus, as shown in fig. 7, including:
step S701, extracting and obtaining three primary color sub-images and local brightness adjusting parameters from source image data;
step S702, driving the liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images, and driving the backlight display unit of the three primary colors to emit light according to the local brightness adjusting parameter; the signal for driving the liquid crystal display panel and the signal for driving the backlight display unit are controlled to achieve time sequence matching according to an image frame signal and a liquid crystal scanning signal, wherein the image frame signal represents the switching time sequence of three primary colors, and the liquid crystal scanning signal represents the scanning time sequence of the liquid crystal display panel.
Since the control method of the field sequential display device described in the embodiment of the present invention is the control method corresponding to the field sequential display device described in the foregoing embodiment, and the specific implementation steps and effect principles thereof are described in detail in the description of the field sequential display device, based on the field sequential display device described in the embodiment of the present invention, those skilled in the art can understand the specific steps and effect principles of the control method of the field sequential display device, and thus, the detailed description thereof is omitted here. The control method of the field sequential display device according to the embodiment of the present invention is within the protection scope of the present invention.
Based on the same inventive concept, an embodiment of the present invention further provides a display apparatus, as shown in fig. 8, including the foregoing field sequential display device 01. The same structure and advantageous effects as those of the field sequential display device 01 provided previously are also obtained.
It should be noted that the display device may be: any product or component with a display function, such as a mobile phone, a liquid crystal panel, a tablet computer, a television, a display, a notebook computer, a digital photo frame or a navigator, etc.
Since the field sequential display device included in the display apparatus according to the embodiment of the present invention has been described in the foregoing, based on the field sequential display device described in the embodiment of the present invention, a person skilled in the art can understand a specific structure and an effect principle of the display apparatus, and thus details are not described herein again. All display devices including the field sequential display apparatus according to the embodiments of the present invention are within the intended scope of the present invention.
Based on the same inventive concept, an embodiment of the present invention further provides a virtual reality display apparatus, as shown in fig. 9, including the foregoing field sequential display device 01. The same structure and advantageous effects as those of the field sequential display device 01 provided previously are also obtained.
Since the field sequential display device included in the virtual reality display apparatus according to the embodiment of the present invention is described in the foregoing, based on the field sequential display device described in the embodiment of the present invention, a person skilled in the art can understand the specific structure and effect principle of the virtual reality display apparatus, and therefore details are not described herein again. All display devices including the field sequential display apparatus according to the embodiments of the present invention are within the intended scope of the present invention.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
the field sequential display device, the control method and the display equipment provided by the embodiment of the invention are characterized in that the image processing module is arranged to extract and obtain three-primary-color sub-images and local brightness adjusting parameters from source image data and send the three-primary-color sub-images and the local brightness adjusting parameters to the driving module. The driving module drives the liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images and drives the backlight display unit to emit light according to the local brightness adjusting parameter, so that color patterns can be displayed without setting a color film, the transmittance of the display module and the backlight lighting effect are effectively improved, and the power consumption is further reduced. And the display module is also arranged to output image frame signals and liquid crystal scanning signals to the driving module to control the driving module to achieve time sequence matching on the driving signals of the liquid crystal display panel and the backlight display unit so as to avoid dynamic afterglow effect and image blurring phenomenon and ensure the quality of displayed images on the basis of reducing power consumption.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the apparatus of an embodiment may be adaptively changed and disposed in one or more apparatuses other than the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (12)
1. A field sequential display device, comprising:
the display module comprises a liquid crystal display panel and a backlight display unit with three primary colors;
the image processing module is connected with the driving module, wherein the image processing module extracts and obtains three primary color sub-images and local brightness adjusting parameters from source image data and sends the three primary color sub-images and the local brightness adjusting parameters to the driving module;
the driving module is connected with the display module to drive the liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images and drive the backlight display unit to emit light according to the local brightness adjusting parameter;
the display module outputs an image frame signal representing the switching time sequence of three primary colors and a liquid crystal scanning signal representing the scanning time sequence of the liquid crystal display panel to the driving module so as to control the driving module to achieve time sequence matching of the driving signals of the liquid crystal display panel and the backlight display unit.
2. The field sequential display device of claim 1, wherein the image processing module comprises:
the device comprises an image extraction unit, an image stripping unit, an image algorithm unit and a backlight algorithm unit;
the image extraction unit is connected with the image stripping unit so as to extract a color image from the source image data and send the color image to the image stripping unit;
the image stripping unit is respectively connected with the image algorithm unit and the backlight algorithm unit so as to extract gray scale parameters of three primary color sub-pixels of the color image and send the gray scale parameters of the three primary color sub-pixels to the image algorithm unit and the backlight algorithm unit;
the image algorithm unit is connected with the driving module to fuse the three primary color subgraphs according to the three primary color sub-pixel gray scale parameters and send the three primary color subgraphs to the driving module;
the backlight algorithm unit is connected with the driving module to analyze the local brightness adjusting parameter according to the gray scale parameters of the three primary color sub-pixels and send the local brightness adjusting parameter to the driving module.
3. The field sequential display device of claim 1, wherein the driving module comprises:
a display driving unit and a backlight driving unit;
the display driving unit is connected between the image processing module and the liquid crystal display panel to convert the received three-primary-color sub-images into standard image signals of the liquid crystal display panel and drive the liquid crystal of the liquid crystal display panel to deflect according to the standard image signals;
the backlight driving unit is connected between the image processing module and the backlight display unit so as to analyze the received local brightness adjusting parameter into an electric control signal and drive the backlight display unit to emit light according to the electric control signal;
wherein a timing of the standard image signal and a timing of the electric control signal are matching timings set according to the image frame signal and the liquid crystal scanning signal.
4. A field sequential display device according to claim 3, wherein the backlight driving unit comprises:
the micro-control unit and the diode driving circuit;
the micro control unit is connected between the image processing module and the diode driving circuit so as to analyze the received local brightness adjusting parameter into an electric control signal and configure the working parameter of the diode driving circuit;
the diode driving circuit is connected with the backlight display unit to output a backlight scanning signal to drive the backlight display unit to emit light based on the working parameter and the received electric control signal.
5. The field sequential display device of claim 4, wherein the diode drive circuit comprises:
the light emitting diodes of the backlight display unit are arranged into light emitting arrays of n rows and 3 x m columns, the light emitting color of each column of light emitting diodes is the same, and the light emitting colors of three adjacent columns of light emitting diodes are three primary colors respectively;
the n row-scanning switches are connected with the n rows of light-emitting arrays in a one-to-one correspondence manner, and each row-scanning switch is connected with the anode of the light-emitting diode in the same row;
the 3 m driving channels are correspondingly connected with the 3 m columns of light emitting arrays one by one, and each driving channel is connected with the cathode of the light emitting diode in the same column.
6. The field sequential display device of claim 5, wherein:
and the micro control unit sends a working synchronization signal to the diode driving circuit to control the frequency of the diode driving circuit for driving the backlight display unit, wherein the frequency of the working synchronization signal is equal to the frame rate of the three primary color sub-images.
7. The field sequential display device of claim 4, wherein the backlight driving unit further comprises:
the backlight display unit comprises 3 x n external row scan switches, wherein the light emitting diodes of the backlight display unit are arranged into light emitting arrays of 3 x n rows and m columns, the light emitting color of each row of light emitting diodes is the same, and the light emitting colors of three adjacent rows of light emitting diodes are three primary colors respectively;
the micro control unit is connected with the 3 x n external row-scanning switches, the 3 x n external row-scanning switches are correspondingly connected with the 3 x n rows of light-emitting arrays one by one, and each external row-scanning switch is connected with the anode of the same row of light-emitting diodes;
the diode driving circuit comprises m driving channels, the m driving channels are connected with the m columns of light emitting arrays in a one-to-one correspondence mode, and each driving channel is connected with the cathode of the light emitting diode in the same column.
8. The field sequential display device of claim 7, wherein:
and the micro control unit sends a working synchronization signal to the diode driving circuit to control the frequency of the diode driving circuit for driving the backlight display unit, wherein the frequency of the working synchronization signal is n times of the frame rate of the three primary color sub-image.
9. A field sequential display device according to any of claims 1 to 8, wherein:
in the process that the driving module drives the backlight display unit to emit light, the initial backlight line scanning time corresponding to each frame of three-primary-color sub-image has a delay time length relative to the initial liquid crystal line scanning time corresponding to each frame of three-primary-color sub-image, and the delay time length is more than or equal to the steady-state response time of the liquid crystal display panel.
10. A method of controlling a field sequential display device, comprising:
extracting and obtaining three-primary-color sub-images and local brightness adjusting parameters from source image data;
driving liquid crystal deflection of the liquid crystal display panel according to the three primary color sub-images, and driving a backlight display unit of three primary colors to emit light according to the local brightness adjusting parameter;
the signal for driving the liquid crystal display panel and the signal for driving the backlight display unit are controlled to achieve time sequence matching according to an image frame signal and a liquid crystal scanning signal, wherein the image frame signal represents the switching time sequence of three primary colors, and the liquid crystal scanning signal represents the scanning time sequence of the liquid crystal display panel.
11. A display apparatus comprising the field sequential display device according to any one of claims 1 to 9.
12. A virtual reality display apparatus comprising the field sequential display device of any one of claims 1 to 9.
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