CN109686325B - Liquid crystal splicing display module and control system and method thereof - Google Patents
Liquid crystal splicing display module and control system and method thereof Download PDFInfo
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- 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
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Abstract
The embodiment of the application provides a liquid crystal tiled display module, a control system and a method of the liquid crystal tiled display module, wherein the control system comprises: a master controller and a plurality of sub-control assemblies. The sub-control assembly corresponds to a backlight module in the liquid crystal splicing display module. The sub-control assembly comprises a signal controller and a backlight driving module, the signal controller is electrically connected with the backlight driving module, and the backlight driving module is used for being electrically connected with each light-emitting unit in the backlight module. The signal controller is electrically connected with the master controller and is used for receiving the master control signal output by the master controller and determining a target local dimming sub-signal adaptive to a target local dimming area according to an original local dimming sub-signal in the master control signal; and sending the target local dimming sub-signal to the backlight driving module, so that the backlight driving module drives the light-emitting units in the target local dimming area to execute local dimming. The signal controller can replace partial functions of the display driver, and the cost of the liquid crystal splicing display module is reduced.
Description
Technical Field
The application relates to the technical field of liquid crystal display, in particular to a liquid crystal splicing display module, a control system and a control method of the liquid crystal splicing display module.
Background
The liquid crystal splicing module is a display device which can realize picture division single-screen display or multi-screen display according to different use requirements, and can realize the following steps: single-screen split display, single-screen individual display, arbitrary combined display, full-screen liquid crystal splicing and the like. The liquid crystal splicing module comprises a plurality of display devices which are spliced together in a matrix form.
In order to increase the contrast and improve the image quality, the liquid crystal splicing module generally has a local dimming function, and the local dimming function can adjust the backlight brightness of each unit area in each display unit of the liquid crystal splicing module. In the prior art, a display driver in the display device receives a master control signal sent by a main controller, and executes calculation work of local dimming, related calculation information is converted and calculated by a processor and then sent to a backlight driving module, and the backlight driving module controls the light emitting state of a corresponding light emitting unit to realize local dimming of the liquid crystal splicing module.
In the prior art, the display driver needs to have the function of local dimming calculation, which results in higher cost.
Disclosure of Invention
The present application is directed to solve at least one of the above technical drawbacks, and particularly to a liquid crystal splicing module having a high cost due to the requirement of a display driver with a local dimming calculation function.
In a first aspect, an embodiment of the present application provides a control system for a liquid crystal tiled display module, including: the master controller comprises a master controller and a plurality of sub-control assemblies; the sub-control assembly corresponds to a backlight module in the liquid crystal splicing display module; the sub-control assembly comprises a signal controller and a backlight driving module; the signal controller is electrically connected with the backlight driving module, and the backlight driving module is used for being electrically connected with each light-emitting unit in the backlight module; the signal controller is electrically connected with the master controller and is used for receiving the master control signal output by the master controller and determining a target local dimming sub-signal adaptive to a target local dimming area according to an original local dimming sub-signal in the master control signal; and sending the target local dimming sub-signal to the backlight driving module, so that the backlight driving module drives the light-emitting units in the target local dimming area to execute local dimming.
In a second aspect, an embodiment of the present application provides a liquid crystal tiled display module, including a plurality of tiled backlight modules and a control system of the liquid crystal tiled display module provided in the first aspect of the present application; each sub-control assembly in the control system corresponds to each backlight module one by one.
In a third aspect, an embodiment of the present application provides a method for controlling a liquid crystal tiled display module, which is implemented based on the control system for a liquid crystal tiled display module provided in the first aspect of the embodiment of the present application, and includes: each sub-control assembly in the control system receives a master control signal; determining a target local dimming sub-signal adaptive to a target local dimming area according to an original local dimming sub-signal in the master control signal; and sending the target local dimming sub-signal to the backlight driving module, so that the backlight driving module drives the light-emitting units in the target local dimming area to execute local dimming.
The technical scheme provided by the embodiment of the application has the following beneficial effects:
in the control system of the liquid crystal tiled display module provided by the embodiment of the application, because the signal controller has a logical operation function, the signal controller can be used for determining the target local dimming sub-signal adapting to the target local dimming area according to the original local dimming sub-signal in the master control signal, and directly sending the target local dimming sub-signal to the backlight driving module. That is to say, signal controller can replace the partial function of the display driver among the prior art, and the display driver can need not to possess the function of conversion local dimming signal, therefore the display driver can select for use simple function, low price's model to reduce the cost of liquid crystal concatenation display module assembly effectively.
In addition, each signal controller can identify the corresponding original signal (such as the original local dimming sub-signal or the original display sub-signal) in the master control signal, so that the control system does not need to set a screen splitter to divide the master control signal, and the cost of the liquid crystal splicing display module is further reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below. Wherein,
fig. 1 is a schematic structural diagram of a control system of a liquid crystal tiled display module according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating a connection state between a backlight driver and a backlight module according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a liquid crystal tiled display module according to an embodiment of the present application;
fig. 4 is a schematic flowchart of a control method of a liquid crystal splicing module according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of an expansion control method for a liquid crystal splicing module according to an embodiment of the present application;
in the figure:
1-a master controller; 2-a sub-control assembly; 21-a signal controller;
22-backlight driving module; 221-a backlight driver; 222-backlight power supply; 23-a display driver;
3-a backlight module; 31-a light emitting unit; 311-a light emitter; 312 — a switching device;
100-display device.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings. The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
In the embodiment of the present application, Local Dimming (Local Dimming) refers to dividing the backlight module into multiple sub-regions, and adjusting the brightness of the backlight according to the gray scale of the image on the display panel corresponding to the sub-regions during operation, so as to achieve the effects of saving energy and enhancing image quality.
The lcd tiled display module generally includes a main controller and a plurality of display devices, and fig. 3 shows a 2 x 2 lcd tiled display module, that is, the lcd tiled display module includes four display devices.
The inventor of the present application finds that, in an existing cascade-connected liquid crystal display module, a display device includes a signal controller, a display driver (TCON), a backlight driving module, a display panel, and a backlight module. In the working process, when a plurality of display devices display an image together, the image represented by the display signal in the master control signal output by the master controller needs to be divided into a plurality of image blocks, and the display panel of each display device displays one of the image blocks respectively. However, the resolution of the image represented by the display signal in the master control signal may not be consistent with the resolution of the liquid crystal tiled display module, and at this time, each image block needs to be amplified, so that the resolutions of the image blocks are respectively adapted to the resolution ratios of the corresponding display devices. As shown in fig. 3, the resolution of the image represented by the display signal (the dashed box in fig. 3 indicates the image) is 1920 × 1080, and the resolution of each image block is 960 × 540. The resolution of each display device in the liquid crystal tiled display module is also 1920 × 1080, and if the image blocks are not enlarged, each image block only occupies one quarter of the area on the display panel of the corresponding display device. Therefore, it is necessary to convert the display signal so that the resolution of the image represented by the converted display signal is adapted to the resolution of the corresponding display device.
Since the area occupied by the image on the display panel is changed, the number of the sub-areas on the backlight module for performing local dimming also needs to be correspondingly adjusted, that is, the local dimming signal in the master control signal needs to be converted, so that the backlight driving module can drive the light emitting units in the corresponding area in the display module to perform local dimming according to the converted local dimming signal.
However, in the prior art, the conversion operation of the local dimming signal needs to be performed by the display driver, and the converted local dimming signal is sent to the backlight driving module, so that the display driver with the local dimming signal conversion function is expensive, which results in higher overall cost of the liquid crystal tiled display module.
The following describes and explains several terms related to embodiments of the present application:
the original display sub-signal corresponds to a display sub-signal of a display device in the unconverted display signal.
And the target display sub-signal corresponds to a display sub-signal of a display device in the converted display signals.
The original display area is an area of the display panel for displaying an image represented by the original display sub-signal.
The target display area is an area of the display panel for displaying an image represented by the target display sub-signal.
The original local dimming sub-signal, the unconverted local dimming signal corresponds to a local dimming sub-signal of a display device.
The target local dimming sub-signal corresponds to a local dimming sub-signal of a display device in the converted local dimming signal.
And the original local dimming area is an area where each light-emitting unit for executing local dimming in the light-emitting module is located under the control of the original local dimming photon signal.
Based on the above reasons, the embodiment of the present application provides a control system of a liquid crystal tiled display module, as shown in fig. 1, including: a master controller 1 and a plurality of sub-control assemblies 2. The sub-control assembly 2 corresponds to the backlight module 3 in the liquid crystal tiled display module. The sub-control assembly 2 includes a signal controller 21 and a backlight driving module 22, the signal controller 21 is electrically connected to the backlight driving module 22, and the backlight driving module 22 is electrically connected to each light emitting unit 31 in the backlight module 3.
The signal controller 21 is electrically connected with the master controller 1 and is used for receiving the master control signal output by the master controller 1 and determining a target local dimming sub-signal adaptive to a target local dimming area according to an original local dimming sub-signal in the master control signal; the target local dimming sub-signal is transmitted to the backlight driving module 22, so that the backlight driving module 22 drives the light emitting units 31 in the target local dimming area to perform local dimming.
In the control system of the lcd tiled display module provided in the embodiment of the present application, since the signal controller 21 itself has a logic operation function, the signal controller 21 can be utilized to determine the target local dimming sub-signal adapted to the target local dimming area according to the original local dimming sub-signal in the master control signal, and directly send the target local dimming sub-signal to the backlight driving module 22. That is to say, the signal controller 21 may replace part of the functions of the display driver 23 in the prior art, and the display driver 23 may not need to have the function of converting the local dimming signal, so that the display driver 23 may select a model with a simple function and a low price, thereby effectively reducing the cost of the lcd tiled display module.
In addition, each signal controller 21 can identify the corresponding original signal (such as the original local dimming sub-signal or the original display sub-signal) in the master control signal, so that the control system does not need to set a screen splitter to split the master control signal, which further reduces the cost of the liquid crystal tiled display module.
Optionally, in the control system of the lcd display module according to the embodiment of the present disclosure, the backlight driving module 22 includes a backlight driver 221 and a backlight power supply 222. The signal controller 21 is electrically connected to the backlight driver 221, and the backlight driver 221 and the backlight power supply 222 are configured to form a loop with each light emitting unit 31.
Taking fig. 2 as an example, the light emitting unit 31 includes a light emitter 311 and a switching device 312, and the light emitter 311 and the switching device 312 are connected in series. A local dimming signal input terminal of the backlight driver 221 is electrically connected to the signal controller 21, and a feedback signal output terminal of the backlight driver 221 is electrically connected to a feedback signal input terminal of the backlight power supply 222. A power supply output terminal of the backlight power supply 222 is electrically connected to an input terminal of the light emitting body 311 in each light emitting unit 31, and a control signal output terminal of the backlight driver 221 is electrically connected to the switching device 312 in each light emitting unit 31.
The light emitting body 311 may be a light emitting diode, and in fig. 2, the light emitting body 311 is 3 light emitting diodes connected in series. The switching device 312 may be a mos (metal Oxide semiconductor) transistor, so that the control signal output terminal of the backlight driver 221 is electrically connected to the gate of the switching device 312.
When the control signal output terminal of the backlight driver 221 outputs a high-level voltage, the switching device 312 is turned on, so that the light emitter 311 emits light; when the control signal output terminal of the backlight driver 221 outputs a low-level voltage, the switching device 312 is turned off, and the light emitter 311 is turned off. With the switching device 312 turned on and off, a PWM (Pulse Width Modulation) signal is formed in the loop, and the backlight driver 221 implements local dimming by means of PWM signal adjustment according to the received target local dimming sub-signal.
Optionally, in the control system of the liquid crystal tiled display module provided in this embodiment of the application, the main controller 1 and the signal controllers 21 in the multiple sub-control assemblies 2 are sequentially connected in series. The signal controller 21 in each current sub-control assembly 2 is configured to receive the total control signal output by the signal controller 21 in the previous sub-control assembly 2 or the total controller 1, and output the total control signal to the signal controller 21 in the next sub-control assembly 2.
Specifically, as shown in fig. 1, the signal controller 21 in the first sub-control component 2 receives the master control signal output by the master controller 1, and outputs the master control signal to the signal controller 21 in the next sub-control component 2; the signal controllers 21 in the sub-control assemblies 2 located at other positions receive the total control signal output by the signal controller 21 in the previous sub-control assembly 2, and then output the total control signal to the signal controller 21 in the next sub-control assembly 2. It should be noted that the original sources of the master control signals output and received between the signal controllers 21 are all the master controller 1, and the content of the master control signals received by the respective signal controllers 21 is the same.
In the control system of the liquid crystal splicing display module provided by the embodiment of the application, the master control signal output by the master controller 1 can be sent to the next signal controller 21 by the last signal controller 21, so that the attenuation of the master control signal is remarkably reduced, and the stability of the master control signal transmission process is ensured.
Optionally, in the control system of the liquid crystal tiled display module provided in the embodiment of the present application, the sub-control assembly 2 further includes a display driver 23, and the display driver 23 is used for being electrically connected to a display panel in the liquid crystal tiled display module.
The signal controller 21 is electrically connected with the display driver 23 and is used for determining a target display sub-signal adaptive to a target display area according to an original display sub-signal in the master control signal; the target display sub-signal is sent to the display driver 23 so that the display driver 23 drives the display panel to display an image in the target display area.
Alternatively, the main controller 1 and the signal controller 21 may both include an SOC (System on Chip) that integrates a microprocessor, an analog IP core, a digital IP core, and a memory (or an off-Chip storage control interface) into a single Chip, and has a relatively high computation capability.
Based on the same inventive concept, the embodiment of the present application further provides a liquid crystal tiled display module, which includes a plurality of tiled backlight modules 3 and the control system provided by the embodiment of the present application. The sub-control assemblies 2 in the control system correspond to the backlight modules 3 one by one.
The structural schematic diagram of the lcd module can refer to fig. 3. It should be noted that, the corresponding backlight module 3 and the sub-control module 2 belong to the same display device 100, and a lcd module may include a pair of display devices 100. The 2 × 2 lcd module shown in fig. 1 includes four display devices 100.
Taking fig. 2 as an example, the backlight module 3 includes a plurality of light emitting unit 31 packages. The light emitting unit 31 includes a light emitter 311 and a switching device 312, and the light emitter 311 and the switching device 312 are connected in series. A local dimming signal input terminal of the backlight driver 221 is electrically connected to the signal controller 21, and a feedback signal output terminal of the backlight driver 221 is electrically connected to a feedback signal input terminal of the backlight power supply 222. A power supply output terminal of the backlight power supply 222 is electrically connected to an input terminal of the light emitting body 311 in each light emitting unit 31, and a control signal output terminal of the backlight driver 221 is electrically connected to the switching device 312 in each light emitting unit 31. The switching device 312 may be a mos (metal Oxide semiconductor) transistor, so that the control signal output terminal of the backlight driver 221 is electrically connected to the gate of the switching device 312.
The display device 100 further includes a display panel, and the display driver 23 in the sub-control unit 2 is electrically connected to the display panel belonging to one display device 100. The specific connection manner of the display driver 23 and the display panel can refer to the prior art in the field, and is not described herein.
Based on the same inventive concept, the embodiment of the present application further provides a control method of a liquid crystal splicing module, which is implemented based on the control system of the liquid crystal splicing display module provided by the embodiment of the present application, and the flow diagram of the method is shown in fig. 4, and includes:
s101: each sub-control component 2 in the control system receives the overall control signal.
The master controller 1 in the control system outputs a master control signal, and the signal controller 21 in each sub-control assembly 2 receives the master control signal. As shown in fig. 1, in the control system of the lcd tiled display module provided in this embodiment of the present application, since the main controller 1 and the signal controllers 21 in the plurality of sub-control assemblies 2 are sequentially connected in series, optionally, each sub-control assembly 2 in the control system receives a main control signal, including: the signal controller 21 in each current sub-control assembly 2 is configured to receive the total control signal output by the signal controller 21 in the previous sub-control assembly 2 or the total controller 1, and output the total control signal to the signal controller 21 in the next sub-control assembly 2.
As shown in fig. 1, the master controller 1 outputs a master control signal including an original display signal, an original local dimming signal, an original display control signal, and the like. The content of the total control signal received by the signal controller 21 in each sub-control assembly 2 is the same, so each signal controller 21 further needs to identify its own corresponding partial signal in the total control signal, and optionally, after each sub-control assembly 2 in the control system receives the total control signal, the method further includes: determining an original display sub-signal according to preset partition information; and determining a part of the original local dimming signal associated with the original display sub-signal in the total control signal as the original local dimming sub-signal.
S102: and determining a target local dimming sub-signal adaptive to the target local dimming area according to the original local dimming sub-signal in the master control signal.
In this step, the signal controller 21 needs to determine whether the original local dimming sub-signal needs to be converted, and if the original local dimming sub-signal does not need to be converted, the original local dimming sub-signal is determined as a target local dimming sub-signal adapted to the target local dimming region; if conversion is needed, the converted original local dimming sub-signal is determined as a target local dimming sub-signal adapted to the target local dimming area.
It should be noted that the determination condition for determining whether the original local tone sub-signal needs to be converted may be determined according to actual requirements. For example, whether the original local modulation sub-signals need to be converted may be determined according to whether the area occupied by the image block represented by the original display sub-signals on the corresponding display panel reaches a preset value. In general, it is generally desirable that image blocks represented by the original display sub-signals are able to fill the corresponding display panel.
When the original local dimming sub-signal needs to be converted, optionally, the target local dimming sub-signal adapted to the target local dimming area is determined according to the original local dimming sub-signal in the master control signal, including: and converting the original local dimming sub-signal into a target local dimming sub-signal adapting to a target local dimming area according to the original display sub-signal in the master control signal and preset display panel resolution information.
S103: the target local dimming sub-signal is sent to the backlight driving module 22, so that the backlight driving module 22 drives the light emitting units 31 in the target local dimming area of the backlight module 3 to perform local dimming.
Optionally, the control method for the liquid crystal splicing module provided by the embodiment of the present application further includes: determining a target display sub-signal adaptive to a target display area according to an original display sub-signal in the master control signal; the target display sub-signal is sent to the display driver 23 so that the display driver 23 drives the display panel to display an image in the target display area.
Based on the same inventive concept, the embodiment of the present application further provides an expansion control method for a liquid crystal splicing module, which is implemented based on the control system for a liquid crystal splicing display module provided by the embodiment of the present application, and the flow diagram of the method is shown in fig. 5, and includes:
s201: after the signal controller 21 in each current sub-control assembly 2 receives the total control signal output by the signal controller 21 in the previous sub-control assembly 2 or the total controller 1, the total control signal is output to the signal controller 21 in the next sub-control assembly 2.
As shown in fig. 1, in the control system of the lcd tiled display module according to the embodiment of the present application, a main controller 1 and signal controllers 21 in a plurality of sub-control assemblies 2 are sequentially connected in series. Therefore, the signal controller 21 in the first sub-control assembly 2 receives the master control signal output by the master controller 1, and outputs the master control signal to the signal controller 21 in the next sub-control assembly 2; the signal controllers 21 in the sub-control assemblies 2 located at other positions receive the total control signal output by the signal controller 21 in the previous sub-control assembly 2, and then output the total control signal to the signal controller 21 in the next sub-control assembly 2.
It should be noted that the original sources of the master control signals output and received between the signal controllers 21 are all the master controller 1, and the content of the master control signals received by the respective signal controllers 21 is the same.
S202: determining an original display sub-signal according to preset partition information; and determining a part of the original local dimming signal associated with the original display sub-signal in the total control signal as the original local dimming sub-signal.
It should be noted that the partition information may be stored in the signal controller 21 when the system of the signal controller 21 is burned. The partition information includes at least the number of partitions, the correspondence between the partitions and the display device 100.
The number of image blocks which are expected to be divided into the image represented by the original display signal in the master control signal is consistent with the number of partitions. For example, a partition number of 4 indicates 4 image blocks into which the image represented by the original display signal is to be divided. The partitions and the display devices 100 may be in a one-to-one correspondence relationship, for example, four display devices 100 of a 2 × 2 lcd module, the number of the partitions may be 4, and each display device 100 is used for displaying a corresponding image block.
Those skilled in the art can understand that each partition corresponds to an image block represented by each original display sub-signal, and the signal controller 21 can determine the original display sub-signals according to the resolution information of the image represented by the original display signals when knowing the corresponding partition.
For example, a certain signal controller 21 corresponds to a first partition, and the first partition corresponds to a first image block. The resolution of the image represented by the original display signal is 1920 × 1080, the first image block is an overlapping area between the pixel points of the 1 st to 960 th columns and the pixel points of the 1 st to 540 th rows in the image, and the original display signal and the data information corresponding to the first image module are the original display sub-signals required by the signal controller 21. Based on the above principle, the other signal controller 21 may also determine the required original display sub-signal.
In the total control signal, the original display signal is associated with the original local dimming signal, and when the signal controller 21 determines the required original display sub-signal, a part of the original local dimming signal associated with the total control signal and the original display sub-signal can be determined as the original local dimming sub-signal.
It should be noted that after the completion of S202, S203 and S205 may be executed at the same time, and of course, there may be a time difference between the start execution start times of S204 and S205, and it is only necessary to ensure that the operation of displaying the image on the display panel and the corresponding local dimming operation can be performed synchronously.
S203: and converting the original local dimming sub-signal into a target local dimming sub-signal adapting to a target local dimming area according to the original display sub-signal in the master control signal and preset display panel resolution information.
Optionally, the method of converting the original local dimming sub-signal into a target local dimming sub-signal adapted to the target local dimming area according to the original display sub-signal in the master control signal and preset display panel resolution information includes: determining a first amplification factor required by the original local dimming area to be amplified to a target local dimming area according to the original display sub-signal and preset display panel resolution information; and converting the original local dimming sub-signal into a target local dimming sub-signal adapting to the target local dimming area according to the first amplification factor.
Optionally, determining a first magnification factor required for the original local dimming region to be magnified to the target local dimming region according to the original display sub-signal and preset display panel resolution information, including: taking the maximum pixel display area of the display panel represented by preset display panel resolution information as a target display area, and determining a second magnification factor required by enlarging the original display area to the target original display area; the second magnification is taken as the first magnification.
The specific step of determining the second magnification may be:
(a) and calculating a first ratio between the number of pixel lines in the maximum pixel display area of the display panel and the number of pixel lines in the original display area, and a second ratio between the number of pixel lines in the maximum pixel display area of the display panel and the number of columns in the original display area.
Taking a display panel with a resolution of 1920 × 1080 as an example, the number of pixel rows in the maximum pixel display area of the display panel is 1080 and the number of pixel columns is 960.
The number of rows and columns of the original display area can be determined according to the respective rates of the image blocks represented by the original display sub-signals. For example, the ratio of the images represented by the original display signal is 1920 × 1080, and the image blocks represented by the original display sub-signals account for one fourth of the images represented by the original display signal, so that the ratio of the image blocks represented by the original display sub-signals is 960 × 540. The number of rows of pixels in the original display area is 540, and the number of columns of pixels is 960. The first ratio and the second ratio are both 2.
(b) And determining a second magnification factor required by the original display area to be magnified to the target original display area according to the first ratio and the second ratio.
In the embodiment of the present application, when the original display area is enlarged to the target original display area, the length and the width of the original display area both need to be enlarged by two times, and the second magnification is 4.
It should also be noted that, if the first ratio, the second ratio or the second magnification is a non-integer, the value of the first ratio, the second ratio or the second magnification may be subjected to blurring processing.
Those skilled in the art will appreciate that the second magnification may be determined after S203 is executed, so that the step of calculating the second magnification may not be repeatedly executed when S204 is executed, and the second magnification calculated in S203 is directly used as the first magnification in S204.
After the execution of S203 is completed, S204 is started.
S204: the target local dimming sub-signal is sent to the backlight driving module 22, so that the backlight driving module 22 drives the light emitting units 31 in the target local dimming area of the backlight module 3 to perform local dimming.
The target local dimming area of the backlight module 3 corresponds to the target display area of the display panel, in this embodiment, the target display area may be the maximum pixel display area of the display panel, and the target local dimming area of the backlight module 3 is an area including all the light emitting units 31 in the backlight module 3.
When the control signal output terminal of the backlight driver 221 outputs a high-level voltage, the switching device 312 is turned on, so that the light emitter 311 emits light; when the control signal output terminal of the backlight driver 221 outputs a low-level voltage, the switching device 312 is turned off, and the light emitter 311 is turned off. With the switching device 312 turned on and off, a PWM (Pulse Width Modulation) signal is formed in the loop, and the backlight driver 221 implements local dimming by means of PWM signal adjustment according to the received target local dimming sub-signal. The backlight driving module 22 drives the light emitting units 31 in the target local dimming area of the backlight module 3 to perform other specific steps of local dimming, which can refer to the prior art in the field and will not be described herein again.
S205: and determining a target display sub-signal adaptive to the target display area according to the original display sub-signal in the master control signal.
In this step, the signal controller 21 needs to determine whether the original display sub-signal needs to be converted, and if the original display sub-signal does not need to be converted, the original display sub-signal is determined as a target local dimming sub-signal adapted to the target local dimming area; and if the conversion is needed, determining the converted original display sub-signal as a target display sub-signal adaptive to the target display area.
It should be noted that the judgment condition for determining whether the original display sub-signal needs to be converted may be determined according to actual requirements. For example, whether the original local modulation sub-signals need to be converted may be determined according to whether the area occupied by the image block represented by the original display sub-signals on the corresponding display panel reaches a preset value. In general, it is generally desirable that image blocks represented by the original display sub-signals are able to fill the corresponding display panel.
When the original display sub-signals need to be converted, taking the maximum pixel display area of the display panel represented by preset display panel resolution information as a target display area, and determining a second magnification factor required by the original display area to be magnified to the target display area; and converting the original display sub-signal into a target display sub-signal adaptive to a target display area according to the second magnification.
The specific step of determining the second magnification in S205 is the same as the specific step of determining the second magnification in S203, and is not described herein again.
After the execution of S205 is completed, execution of S206 is started.
S206: the target display sub-signal is sent to the display driver 23 so that the display driver 23 drives the display panel to display an image in the target display area.
The specific range of the display panel in the target display area may be determined according to actual needs, and in the embodiment of the present application, the target display area may be a maximum pixel display area of the display panel. The principle and process of the display driver 23 driving the display panel to display the image in the target display area can refer to the prior art in the field, and are not described herein in detail.
By applying the embodiment of the application, at least the following technical effects can be realized:
1. in the control system of the liquid crystal tiled display module provided by the embodiment of the application, because the signal controller has a logical operation function, the signal controller can be used for determining the target local dimming sub-signal adapting to the target local dimming area according to the original local dimming sub-signal in the master control signal, and directly sending the target local dimming sub-signal to the backlight driving module. That is to say, signal controller can replace the partial function of the display driver among the prior art, and the display driver can need not to possess the function of conversion local dimming signal, therefore the display driver can select for use simple function, low price's model to reduce the cost of liquid crystal concatenation display module assembly effectively.
In addition, each signal controller can identify the corresponding original signal (such as the original local dimming sub-signal or the original display sub-signal) in the master control signal, so that the control system does not need to set a screen splitter to divide the master control signal, and the cost of the liquid crystal splicing display module is further reduced.
2. In the control system of the liquid crystal splicing display module provided by the embodiment of the application, the master control signal output by the master controller can be sent to the next signal controller by the last signal controller, so that the attenuation of the master control signal is remarkably reduced, and the stability of the transmission process of the master control signal is ensured.
Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, steps, measures, schemes in the prior art having various operations, methods, procedures disclosed in the present application may also be alternated, modified, rearranged, decomposed, combined, or deleted.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least a portion of the steps in the flow chart of the figure may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (9)
1. The utility model provides a control system of liquid crystal tiled display module assembly which characterized in that includes: the master controller comprises a master controller and a plurality of sub-control assemblies; the sub-control assembly corresponds to a backlight module in the liquid crystal splicing display module;
the sub-control assembly comprises a signal controller and a backlight driving module; the signal controller is electrically connected with the backlight driving module, and the backlight driving module is used for being electrically connected with each light-emitting unit in the backlight module;
the signal controller is electrically connected with the master controller and is used for receiving the master control signal output by the master controller and determining a target local dimming sub-signal adapting to a target local dimming area according to an original local dimming sub-signal in the master control signal; sending the target local dimming sub-signal to a backlight driving module, so that the backlight driving module drives the light-emitting units in the target local dimming area of the backlight module to execute local dimming;
the master controller and the signal controllers in the plurality of sub-control assemblies are sequentially connected in series; the signal controller in each current sub-control assembly is used for receiving the master control signal output by the signal controller in the previous sub-control assembly or the master controller and then outputting the master control signal to the signal controller in the next sub-control assembly;
the signal controller is configured to receive a master control signal output by the master controller, and determine a target local dimming sub-signal adaptive to a target local dimming area according to an original local dimming sub-signal in the master control signal, including:
and converting the original local dimming sub-signal into a target local dimming sub-signal adaptive to a target local dimming area according to the original display sub-signal in the master control signal and preset display panel resolution information.
2. The control system of claim 1, wherein the backlight driving module comprises a backlight driver and a backlight power supply;
the signal controller is electrically connected with the backlight driver, and the backlight driver and the backlight power supply are used for forming a loop with each light-emitting unit.
3. The control system of claim 1, wherein the sub-control assembly further comprises a display driver; the display driver is used for being electrically connected with a display panel in a liquid crystal display unit in the liquid crystal splicing display module;
the signal controller is electrically connected with the display driver and is used for determining a target display sub-signal adapting to a target display area according to an original display sub-signal in the master control signal; and sending the target display sub-signal to a display driver, so that the display driver drives a display panel to display an image in the target display area.
4. A liquid crystal tiled display module comprising a plurality of tiled backlight modules, and the control system of any of claims 1-3; and each sub-control assembly in the control system corresponds to each backlight module one to one.
5. A control method of a liquid crystal splicing module is realized based on the control system of any one of claims 1 to 3, and is characterized by comprising the following steps:
each sub-control assembly in the control system receives a master control signal;
determining a target local dimming sub-signal adaptive to a target local dimming area according to an original local dimming sub-signal in the master control signal;
sending the target local dimming sub-signal to a backlight driving module, so that the backlight driving module drives a light-emitting unit in the target local dimming area of the backlight module to execute local dimming;
each sub-control assembly in the control system receives a master control signal, and the method comprises the following steps: after the signal controller in each current sub-control assembly receives the master control signal output by the signal controller in the previous sub-control assembly or the master controller, the master control signal is output to the signal controller in the next sub-control assembly;
the determining a target local dimming sub-signal adapting to a target local dimming area according to an original local dimming sub-signal in the master control signal includes:
and converting the original local dimming sub-signal into a target local dimming sub-signal adaptive to a target local dimming area according to the original display sub-signal in the master control signal and preset display panel resolution information.
6. The control method according to claim 5, wherein the converting the original local dimming sub-signal into a target local dimming sub-signal adapted to a target local dimming area according to the original display sub-signal and preset display panel resolution information in the total control signal comprises:
determining a first amplification factor required by the original local dimming area to be amplified to the target local dimming area according to the original display sub-signal and preset display panel resolution information;
and converting the original local dimming sub-signal into a target local dimming sub-signal adapting to a target local dimming area according to the first amplification factor.
7. The method according to claim 6, wherein the determining a first magnification factor required for the original local dimming region to be magnified to the target local dimming region according to the original display sub-signal and preset display panel resolution information comprises:
taking the maximum pixel display area of the display panel represented by preset display panel resolution information as a target display area, and determining a second magnification factor required by enlarging the original display area to the target display area;
and taking the second magnification as the first magnification.
8. The control method according to claim 7, characterized by further comprising:
determining a target display sub-signal adaptive to the target display area according to the original display sub-signal in the master control signal;
and sending the target display sub-signal to a display driver, so that the display driver drives a display panel to display an image in the target display area.
9. The control method according to claim 5, wherein after each sub-control component in the control system receives the overall control signal, the method further comprises:
determining the original display sub-signal according to preset partition information; and
and determining part of the original local dimming signals in the total control signal, which are associated with the original display sub-signals, as the original local dimming sub-signals.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910160956.0A CN109686325B (en) | 2019-03-04 | 2019-03-04 | Liquid crystal splicing display module and control system and method thereof |
| PCT/CN2020/075032 WO2020177515A1 (en) | 2019-03-04 | 2020-02-13 | Liquid crystal tiled display module, control system and method for liquid crystal tiled display module |
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| CN201910160956.0A CN109686325B (en) | 2019-03-04 | 2019-03-04 | Liquid crystal splicing display module and control system and method thereof |
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| CN109686325B (en) * | 2019-03-04 | 2021-04-06 | 京东方科技集团股份有限公司 | Liquid crystal splicing display module and control system and method thereof |
| CN109741712A (en) * | 2019-03-27 | 2019-05-10 | 京东方科技集团股份有限公司 | Backlight driving method and device, display device |
| CN112397032B (en) * | 2019-08-19 | 2022-06-07 | Tcl科技集团股份有限公司 | Dynamic backlight driving module, method and display driving module |
| CN113053261A (en) * | 2021-03-22 | 2021-06-29 | 福州京东方光电科技有限公司 | Splicing display device and splicing display method |
| CN114927110B (en) * | 2022-06-27 | 2024-03-15 | 青岛信芯微电子科技股份有限公司 | Backlight control method, display equipment, chip system and medium |
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| JP2012118419A (en) * | 2010-12-03 | 2012-06-21 | Hitachi Consumer Electronics Co Ltd | Image display device |
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| KR101264720B1 (en) * | 2007-06-15 | 2013-05-15 | 엘지디스플레이 주식회사 | Driving circuit for liquid crystal display device and method for driving the same |
| CN201060342Y (en) * | 2007-06-20 | 2008-05-14 | 上海仙视电子有限公司 | Split joint circuit module in LCD large screen |
| JP5671608B2 (en) * | 2011-03-29 | 2015-02-18 | シャープ株式会社 | Image display device and image display method |
| WO2013018822A1 (en) * | 2011-08-03 | 2013-02-07 | シャープ株式会社 | Image display device and image display method |
| CN102903345B (en) * | 2012-10-11 | 2015-08-05 | Tcl数码科技（深圳）有限责任公司 | A kind of method, device adjusting liquid crystal-spliced system brightness |
| CN103500555B (en) * | 2013-10-08 | 2015-12-23 | 深圳市摩西尔电子有限公司 | A kind of LED display video resolution matched processing method and system |
| CN204190885U (en) * | 2014-09-19 | 2015-03-04 | 利亚德光电股份有限公司 | Splice displaying system, LED liquid crystal display and television set |
| CN106373493A (en) * | 2016-09-27 | 2017-02-01 | 京东方科技集团股份有限公司 | Splicing screen, splicing screen driving method and device and display equipment |
| CN109686325B (en) * | 2019-03-04 | 2021-04-06 | 京东方科技集团股份有限公司 | Liquid crystal splicing display module and control system and method thereof |
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| JP2012118419A (en) * | 2010-12-03 | 2012-06-21 | Hitachi Consumer Electronics Co Ltd | Image display device |
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