CN113129846B - Backlight control method, device, system and storage medium - Google Patents

Backlight control method, device, system and storage medium Download PDF

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Publication number
CN113129846B
CN113129846B CN202110394754.XA CN202110394754A CN113129846B CN 113129846 B CN113129846 B CN 113129846B CN 202110394754 A CN202110394754 A CN 202110394754A CN 113129846 B CN113129846 B CN 113129846B
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mini
compensated
led
backlight
leds
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CN113129846A (en
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李起源
林荣镇
严丞辉
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Beijing Xianxin Technology Co ltd
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Beijing Xianxin Technology Co ltd
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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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention provides a backlight control method, device and system and a storage medium. The method comprises the following steps: determining mini LEDs to be compensated, wherein the mini LEDs to be compensated comprise mini LEDs with abnormal display and mini LEDs positioned at the edge and the corner of the backlight module; acquiring a control signal matched with a display picture of a liquid crystal panel, wherein the control signal is used for controlling the brightness of the backlight module; compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal; and controlling the backlight module according to the compensated control signal. The backlight control method, the device, the system and the storage medium provided by the invention can effectively improve the display balance of the backlight module, do not need to add an additional structure, save the manufacturing time of the backlight module and reduce the cost.

Description

Backlight control method, device, system and storage medium
Technical Field
The present invention relates to backlight control technologies, and in particular, to a method, an apparatus, a system, and a storage medium for controlling backlight.
Background
In the display field, Backlight (Backlight) is a common means for improving display effect. For example, in a liquid crystal television (LCD TV), a backlight module may be formed by Light Emitting Diodes (LEDs), especially small-sized mini-LEDs (mini-LEDs), to improve the color performance of the LCD TV.
In practical applications, the mini LEDs in the backlight module may exhibit uneven brightness due to various reasons, resulting in poor backlight effect, and although the problem can be solved by inserting a film or a reflective plate, the manufacturing time of the backlight module is long and the cost is high.
Disclosure of Invention
The invention provides a backlight control method, device, system and storage medium, which are used for solving the problem of high manufacturing cost of a backlight module.
In a first aspect, the present invention provides a backlight control method, including:
determining mini LEDs to be compensated, wherein the mini LEDs to be compensated comprise mini LEDs with abnormal display and mini LEDs positioned at the edge and the corner of the backlight module;
acquiring a control signal matched with a display picture of a liquid crystal panel, wherein the control signal is used for controlling the brightness of the backlight module;
compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal;
and controlling the backlight module according to the compensated control signal.
Optionally, the backlight module includes a plurality of mini LEDs, and the mini LEDs are arranged in rows and columns; the plurality of mini LEDs includes: mini LEDs located at the middle, mini LEDs located at the edges, and mini LEDs located at the corners; the mini LEDs at the edge are mini LEDs adjacent to three mini LEDs, and the mini LEDs at the corner are mini LEDs adjacent to two mini LEDs;
and the compensation value corresponding to the mini LED positioned at the corner is greater than the compensation value corresponding to the mini LED positioned at the edge.
Optionally, the method further includes:
acquiring a display lookup table from an external memory, wherein the display lookup table comprises compensation values corresponding to mini LEDs to be compensated in the backlight module; and/or acquiring a compensation value corresponding to the mini LED to be compensated, which is input by a user;
correspondingly, the compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal includes:
and compensating the control signal according to the obtained compensation value to obtain a compensated control signal.
Optionally, the compensation value is a time-varying compensation value.
Optionally, the method is applied to a backlight control system, where the backlight control system includes a timing controller, a dimming controller, and an LED driver;
the timing controller is used for sending backlight image data to the dimming controller;
the dimming controller is used for determining the duty ratio and/or the current value of the PWM signal according to the backlight image data and sending the duty ratio and/or the current value to the LED driver;
the LED driver is used for outputting a corresponding PWM signal to the mini LED according to the duty ratio and/or the current value;
the compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal, which includes at least one of the following:
compensating the backlight image data corresponding to the mini LED to be compensated through the timing controller;
compensating the duty ratio and/or current value corresponding to the mini LED to be compensated through the dimming controller;
and compensating the PWM signal of the mini LED to be compensated through the LED driver.
Optionally, before the compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal, the method further includes:
after the backlight module is started each time, carrying out diagnosis test on an LED driver in the backlight module, and determining the LED driver with a fault;
for each mini LED in the backlight module, searching the position of an abnormal mini LED within a preset range around the mini LED, wherein the abnormal mini LED comprises the mini LED controlled by the LED driver with the fault;
and determining a corresponding compensation value according to the position of each mini LED and the position of the abnormal mini LED within the preset range.
Optionally, the compensating the duty ratio and/or the current value corresponding to the mini LED to be compensated includes:
acquiring backlight image data sent by the timing controller, and inserting black image data between two adjacent frames of backlight image data;
and determining a dynamic compensation value corresponding to the PWM signal according to the alternating change time of the black image data and the backlight image data, and obtaining a compensated duty ratio and/or current value according to the dynamic compensation value.
In a second aspect, the present invention also provides a backlight control apparatus, comprising: a memory and at least one processor;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of any one of the first aspects.
In a third aspect, the present invention further provides a backlight control system, including: the backlight control equipment and the backlight module set of the second aspect;
wherein the backlight control device is a timing controller, a dimming controller or an LED driver; the backlight module comprises a plurality of mini LEDs, and the mini LEDs are used for displaying corresponding brightness under the control of the backlight control equipment.
In a fourth aspect, the present invention also provides a computer-readable storage medium having stored thereon computer-executable instructions for implementing the method according to any one of the first aspect when executed by a processor.
According to the backlight control method, the device, the system and the storage medium provided by the invention, the mini LEDs to be compensated are determined, the mini LEDs to be compensated comprise the mini LEDs with abnormal display and the mini LEDs positioned at the edge and the corner of the backlight module, the control signal matched with the display picture of the liquid crystal panel is obtained, the control signal is used for controlling the brightness of the backlight module, the mini LEDs to be compensated are compensated according to the control signal, the compensated control signal is obtained, the backlight module is controlled according to the compensated control signal, the display balance of the backlight module can be effectively improved, an additional structure is not required to be added, the manufacturing time of the backlight module is saved, and the cost is reduced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram illustrating positions of edges and corners of a backlight module according to an embodiment of the invention;
fig. 2 is a schematic diagram illustrating a principle of brightness difference of a backlight module according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a backlight control method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a backlight control system according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a backlight compensation according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a process for determining a compensation value according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention.
With the above figures, certain embodiments of the invention have been illustrated and described in more detail below. The drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the embodiments of the present invention, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
The method provided by the embodiment of the invention can be applied to any field needing backlight control. Alternatively, the backlight function can be realized by using a mini LED, which can be an LED device with a chip size of 50-200 μm. The mini LED may be an Active Matrix (AM) mini LED. The mini LEDs form a backlight module, which may also be referred to as a Back Light Unit (BLU).
In the backlight module, the mini LEDs at the edges and corners may have a brightness difference with the mini LEDs at the middle position, resulting in poor backlight effect. Fig. 1 is a schematic diagram of positions of an edge and a corner of a backlight module according to an embodiment of the invention. As shown in fig. 1, a rectangular solid-line frame indicates a substrate, a circle disposed on the substrate indicates a mini LED, and a plurality of mini LEDs constitute a backlight module. The mini LEDs in the rectangular dashed boxes on the four sides can be marked as mini LEDs located at the edges, the mini LEDs in the square dashed boxes at the four corners can be marked as mini LEDs located at the corners, and the rest of the mini LEDs are marked as mini LEDs located in the middle.
Fig. 2 is a schematic diagram illustrating a principle of luminance difference of a backlight module according to an embodiment of the present invention. In fig. 2, the bottom rectangle represents a substrate, and the top rectangles represent mini LEDs, which correspond to the side view of the backlight module shown in fig. 1. The two diagonal lines extending from each mini LED are used to indicate the range of light emitted by the mini LED. As can be seen from fig. 2, at positions 1, 2, 3, 4 and 5, there is a superposition of light emitted by two adjacent mini LEDs, and therefore it is brighter, and at position 6, there is only one mini LED emitting light, and therefore the brightness at position 6 is less than that at other positions, resulting in uneven brightness display of the whole backlight module.
In addition, non-uniformity of the quality of the mini LED and the Surface Mount Technology (SMT) process quality of the mini LED may also cause brightness variation.
In order to solve the problem, the display balance of the backlight module can be improved by inserting a film or a reflecting plate, or replacing a mini LED with quality problem, and the like. However, this results in an increase in the manufacturing time and cost of the backlight assembly.
In view of this, an embodiment of the present invention provides a backlight control method, in which when performing backlight control, mini LEDs to be compensated are determined, where the mini LEDs to be compensated are mini LEDs with abnormal display and mini LEDs located at edges and corners of a backlight module, and after a control signal for controlling brightness of the backlight module is obtained, the mini LEDs to be compensated are compensated to obtain a compensated control signal, and then the backlight module is controlled according to the compensated control signal, so as to effectively improve display balance of the backlight module, without adding an additional structure, save manufacturing time of the backlight module, and reduce cost.
The following describes the technical solution of the present invention and how to solve the above technical problems with specific examples. 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 invention will be described below with reference to the accompanying drawings.
Fig. 3 is a flowchart illustrating a backlight control method according to an embodiment of the present invention. As shown in fig. 3, the method includes:
step 301, determining the mini LEDs to be compensated, wherein the mini LEDs to be compensated comprise mini LEDs displaying abnormal and mini LEDs positioned at the edge and corner of the backlight module.
The mini LEDs located at the edges and corners may be mini LEDs located at the edges or corners of the backlight module. The mini LED with abnormal display can be a mini LED at an unspecified position, and the light emitting brightness of the mini LED with abnormal display is different from that of other surrounding mini LEDs.
Optionally, in the testing process of the backlight module, the same gray value may be assigned to each mini LED, and the mini LEDs are controlled to display the corresponding brightness based on the gray value, and meanwhile, whether the actual display brightness of each mini LED in the backlight module is different may be determined through human eye observation or through a brightness meter, and the mini LED with abnormal display is found out.
Optionally, the mini LEDs located in the middle of the backlight module may be tested to find out the mini LEDs in which abnormal display is displayed, and the mini LEDs located at the edge and corner of the backlight module are used together as the mini LEDs to be compensated.
And 302, acquiring a control signal matched with a display picture of the liquid crystal panel, wherein the control signal is used for controlling the brightness of the backlight module.
The control signal may be any signal for controlling the backlight module. The control signal may be a signal directly received by the backlight module, or may be a signal for indirectly controlling the backlight module.
The backlight module is used for providing a backlight function for the liquid crystal panel so as to enhance the display effect of the liquid crystal panel. The control signal can change along with the display picture of the liquid crystal panel, thereby realizing dynamic backlight control.
And 303, compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal.
Optionally, the control signal may include a control signal corresponding to each mini LED in the backlight module. For the mini-LEDs located at the edge and the corner, the corresponding control signals can be changed to increase the display brightness; for a mini LED with abnormal display, the corresponding control signal can be changed to make the display brightness of the mini LED consistent with that of the surrounding mini LEDs.
And step 304, controlling the backlight module according to the compensated control signal.
Optionally, the mini LEDs in the backlight module may be controlled by a Pulse Width Modulation (PWM) signal.
In practical application, the positions of the mini LEDs to be compensated can be found through testing by testing equipment or through perceptual testing of human eyes, and the problem of uneven brightness of the mini LEDs can be simply solved by setting compensation values of corresponding positions, so that the manufacturing time and cost of the backlight module can be reduced.
The backlight control method provided by this embodiment may determine the mini LEDs to be compensated, where the mini LEDs to be compensated include mini LEDs with abnormal display and mini LEDs located at edges and corners of the backlight module, acquire a control signal matched with a display image of the liquid crystal panel, and the control signal is used to control the brightness of the backlight module, and compensate the mini LEDs to be compensated according to the control signal, so as to obtain a compensated control signal, thereby controlling the backlight module according to the compensated control signal, which may effectively improve the display balance of the backlight module, and does not need to add an additional structure, save the manufacturing time of the backlight module, and reduce the cost.
In the technical solution provided in the above embodiment, optionally, the backlight module includes a plurality of mini LEDs, and the mini LEDs are arranged in rows and columns; the plurality of mini LEDs includes: mini LEDs located at the middle, mini LEDs located at the edges, and mini LEDs located at the corners; the mini LEDs at the edge are mini LEDs adjacent to three mini LEDs, and the mini LEDs at the corner are mini LEDs adjacent to two mini LEDs; and the compensation value corresponding to the mini LED positioned at the corner is greater than the compensation value corresponding to the mini LED positioned at the edge.
Referring specifically to fig. 1, the backlight module includes a plurality of rows and a plurality of columns, each row and each column having a plurality of mini LEDs. Considering four directions, up, down, left and right, for any mini LED in the backlight module: if other mini LEDs are arranged in four directions around the mini LED, the mini LED is the mini LED positioned in the middle; if other mini LEDs are arranged around the mini LED in three directions, the mini LED is the mini LED positioned at the edge; if there are only two other mini-LEDs around the mini-LED, the mini-LED is the one located at the corner.
When the mini LEDs are compensated, the compensation value corresponding to the mini LEDs at the corners is larger than the compensation value corresponding to the mini LEDs at the edges, so that the actual display brightness difference between the mini LEDs at the corners and the mini LEDs at the edges is reduced, and the backlight control effect is further improved.
Fig. 4 is a schematic diagram of a backlight control system according to an embodiment of the present invention. The method provided by the embodiment of the invention can be applied to the backlight control system. As shown in fig. 4, the backlight control system may include a Timing Controller (Timing Controller), a dimming Controller (Dimmer Controller), and an LED Driver (LED Driver).
Wherein the timing controller is configured to send the backlight image data to the dimming controller. Optionally, the timer may obtain a display image from a data source and send the display image to the liquid crystal panel, and may also generate corresponding backlight image data according to the display image and send the backlight image data to the dimming controller. The display frame of the liquid crystal panel may be a color frame, the backlight image data may be grayscale image data corresponding to the color frame, and the mini LEDs at different positions may correspond to the same or different grayscale values.
And the dimming controller is used for determining the duty ratio and/or the current value of the PWM signal according to the backlight image data and sending the duty ratio and/or the current value to the LED driver. Alternatively, different gray values may correspond to different duty ratios or current values, so that the mini LED may display the brightness corresponding to the gray values. Generally, the larger the duty cycle and current value, the brighter the mini LED.
And the LED driver is used for outputting a corresponding PWM signal to the mini LED according to the duty ratio and/or the current value. Optionally, there may be more than one LED driver, and each LED driver may control one or more mini LEDs.
The execution subject of the method provided by the embodiments of the present invention may be at least one of the customization controller, the dimming controller and the LED driver.
Correspondingly, the compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal may include at least one of the following: compensating the backlight image data corresponding to the mini LED to be compensated through the timing controller; compensating the duty ratio and/or the current value corresponding to the mini LED to be compensated through the dimming controller; and compensating the PWM signal of the mini LED to be compensated through the LED driver.
In an optional implementation manner, the control signal may be backlight image data, and when the control signal is compensated, the timing controller may specifically compensate the backlight image data corresponding to the mini LED to be compensated.
Optionally, after determining the backlight image data matched with the display frame of the liquid crystal panel, the timing controller may compensate the backlight image data corresponding to the mini LEDs with abnormal display and the mini LEDs located at the edge and the corner, and obtain the compensated backlight image data, and send the compensated backlight image data to the dimming controller. And the dimming controller generates the duty ratio and/or the current value of the PWM signal according to the compensated backlight image data and sends the duty ratio and/or the current value to the LED driver so as to control the mini LED.
In another alternative implementation, the control signal may be a duty cycle and/or a current value. When compensating the control signal, the duty ratio and/or the current value corresponding to the mini LED to be compensated may be compensated by the dimming controller.
Specifically, after the timing controller acquires the backlight image data matched with the display image of the liquid crystal panel from the signal source, the timing controller directly sends the acquired backlight image data to the dimming controller without performing compensation. And after the dimming controller acquires the backlight image data, generating a corresponding duty ratio and/or current value, and compensating the mini LED with abnormal display and the mini LEDs positioned at the edge and the corner to obtain the compensated duty ratio and/or current value. Or, the dimming controller may directly generate a corresponding duty ratio and/or current value according to the acquired backlight image data and compensation values corresponding to the mini LEDs with abnormal display and the mini LEDs located at the edges and corners, and send the duty ratio and/or current value to the LED driver, and the LED driver outputs a PWM signal according to the received duty ratio and/or current value to control the mini LEDs.
In yet another alternative implementation, the control signal may be a PWM signal. When compensating the control signal, the LED driver may specifically compensate the PWM signal corresponding to the mini LED to be compensated.
Specifically, after the timing controller acquires the backlight image data matched with the display image of the liquid crystal panel from the signal source, the timing controller directly sends the acquired backlight image data to the dimming controller without performing compensation. The dimming controller generates corresponding duty ratio and/or current value to send to the LED driver after acquiring backlight image data, and the LED driver compensates the mini LED with abnormal display and the mini LEDs at the edge and the corner according to the received duty ratio and/or current value to obtain a compensated PWM signal and output the compensated PWM signal to the mini LED.
Fig. 5 is a schematic diagram illustrating a principle of backlight compensation according to an embodiment of the present invention. As shown in fig. 5, a compensation value may be added for the backlight image data or the PWM signal to obtain compensated backlight image data or compensated PWM signal, and the mini LED may be controlled according to the compensated backlight image data or PWM signal.
In addition, the misalignment compensation can be realized through a timing controller, a dimming controller and an LED driver. Optionally, the timing controller may compensate for mini LEDs located at edges and corners, and the dimming controller may compensate for mini LEDs displaying an abnormal condition, so that the calculated amount is distributed to each device, and the overall processing efficiency of the system is improved.
On the basis of the technical solutions provided in the foregoing embodiments, optionally, a display Look-Up Table (Look Up Table, LUT) may be obtained from an external memory, where the display Look-Up Table includes a compensation value corresponding to a mini LED to be compensated in the backlight module; and/or acquiring a compensation value corresponding to the mini LED to be compensated and input by a user.
Correspondingly, the compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal may include: and compensating the control signal according to the obtained compensation value to obtain a compensated control signal.
Specifically, the external memory may store a display lookup table, where the display lookup table includes compensation values corresponding to the mini LEDs to be compensated, or may store compensation values corresponding to all the mini LEDs in the backlight module (the compensation value of the normal mini LED in the middle position may be 0 or a reference value), and the timing controller, the dimming controller, or the LED driver may compensate the control signal according to the compensation values in the display lookup table, which is simple in logic and easy to implement.
Or, when testing the backlight module or in the actual use process, a user (a developer, a tester or a user) can manually input a compensation value, and the timing controller, the dimming controller or the LED driver can compensate the control signal according to the compensation value input by the user, so as to meet the requirements of development and testing and the personalized setting of the user.
In the compensation, a compensation value may be set for each mini LED to be compensated, respectively, in units of a single mini LED, or a same compensation value may be set for a plurality of mini LEDs controlled by a same LED driver, in units of LED drivers, or a same compensation value may be set for mini LEDs in a same row in a horizontal/vertical/diagonal direction, in units of a row of mini LEDs in the same row. Of course, the compensation value can also be set in other ways, for example in units of a smaller or larger area.
Alternatively, the compensation value may be a time-varying compensation value. Specifically, the time unit for setting the compensation value may be each frame or even unit time, that is, the compensation value corresponding to each frame may be the same or different, thereby implementing dynamic compensation of the mini LED.
Fig. 6 is a schematic flowchart of determining a compensation value according to an embodiment of the present invention. As shown in fig. 6, before the mini LED to be compensated is compensated according to the control signal to obtain a compensated control signal, the following steps may be further performed:
step 601, after the backlight module is started each time, performing a diagnostic test on the LED driver in the backlight module, and determining the LED driver with a fault.
Alternatively, the number of the LED drivers may be plural. The manner of performing the diagnostic test on the plurality of LED drivers may be designed according to actual needs, for example, the dimming controller may send test data to each LED driver, and the LED drivers return corresponding response data to the dimming controller after receiving the test data. If the dimming controller does not receive correct response data from the LED driver, the LED driver is indicated to have a fault.
Step 602, for each mini LED in the backlight module, finding a position of an abnormal mini LED within a preset range around the mini LED, wherein the abnormal mini LED includes a mini LED controlled by the failed LED driver.
Step 603, determining a corresponding compensation value according to the position of each mini-LED and the position of the abnormal mini-LED within the preset range.
After determining that there is a defective mini LED, it may be determined that the mini LED controlled by the LED driver does not normally operate, and thus, the surrounding mini LEDs may be compensated for.
Specifically, for each normally operable mini LED, abnormal mini LEDs around the mini LED may be searched, and a compensation value corresponding to the normally operable mini LED may be determined according to a position of the abnormal mini LED.
Alternatively, when determining the compensation value of the first mini LED, the initial compensation value may be determined according to the position of the first mini LED and whether the first mini LED is abnormal, for example, if the first mini LED is located at an edge, the initial compensation value is 10, if the mini LED is located at a corner, the compensation value is 20, and if the first mini LED is located at a middle, the mini LED with abnormal display, the initial compensation value is 5.
Then, the initial compensation value may be adjusted according to whether there is an abnormal mini LED in the adjacent mini LEDs of the first mini LED, for example, if there is one abnormal mini LED around the first mini LED, the initial compensation value of the first mini LED is +5, and if there are two abnormal mini LEDs around the first mini LED, the initial compensation value of the first mini LED is +10, so as to obtain a final compensation value, and the final compensation value is used for compensating the control signal.
In this embodiment, after the backlight module is started each time, a diagnostic test is performed on the LED driver in the backlight module to determine the LED driver with a fault, and for each mini LED in the backlight module, the position of the abnormal mini LED in the preset range around the mini LED is searched, wherein the abnormal mini LED includes the mini LED controlled by the LED driver with the fault, and the corresponding compensation value is determined according to the position of each mini LED and the position of the abnormal mini LED in the preset range, so that when the LED driver has a fault in the actual use process, other mini LEDs around the mini LED controlled by the LED driver with the fault can be compensated in time, the influence of the fault of the LED driver on the backlight effect is reduced, and the performance of the backlight module is improved.
On the basis of the technical solutions provided by the foregoing embodiments, optionally, the compensating the duty ratio and/or the current value corresponding to the mini LED to be compensated includes: acquiring backlight image data sent by the timing controller, and inserting black image data between two adjacent frames of backlight image data; and determining a dynamic compensation value corresponding to the PWM signal according to the alternating change time of the black image data and the backlight image data, and obtaining a compensated duty ratio and/or current value according to the dynamic compensation value.
Illustratively, the display frequency of the liquid crystal panel is 120Hz, and accordingly, the timing controller may transmit the backlight image data to the dimming controller at a frequency of 120Hz, i.e., 120 frames of backlight image data per second. The dimming controller may insert one frame of black image data between two adjacent frames of backlight image data, that is, control the backlight module to display 240 frames of image data per second, wherein the backlight image data and the black image data are alternately displayed to enhance the display effect.
The dimming controller may control the mini LED according to the backlight image data and the black image data. When displaying a backlight image, different mini LEDs may present different brightness, and when displaying a black image, the gray values corresponding to all mini LEDs may be controlled to be 0, thereby implementing a black insertion effect.
The dimming controller may determine a dynamic compensation value corresponding to the PWM signal according to the alternate change time of the black image data and the backlight image data to perform compensation according to the dynamic compensation value.
Optionally, the duration of each frame of the inserted black image data is equal to the duration of each frame of the backlight image data, when the mini LEDs are controlled according to the backlight image data, the compensation value is obtained by the method, and when the mini LEDs are controlled according to the black image data, the compensation values of all the mini LEDs are 0. And the dimming controller compensates the duty ratio and/or the current value of the PWM signal according to the dynamic compensation value to obtain the compensated duty ratio and/or the compensated current value.
By acquiring the backlight image data sent by the timing controller, inserting black image data between two adjacent frames of backlight image data, determining a dynamic compensation value corresponding to the PWM signal according to the alternating change time of the black image data and the backlight image data, and obtaining a compensated duty ratio and/or current value according to the dynamic compensation value, the dynamic compensation under the black insertion function can be realized, and the display effect is improved.
Fig. 7 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention. As shown in fig. 7, the apparatus includes:
the determining module 701 is used for determining mini LEDs to be compensated, wherein the mini LEDs to be compensated comprise mini LEDs with abnormal display and mini LEDs positioned at the edge and the corner of the backlight module;
an obtaining module 702, configured to obtain a control signal matched with a display frame of a liquid crystal panel, where the control signal is used to control brightness of the backlight module;
the compensation module 703 is configured to compensate the mini LED to be compensated according to the control signal, so as to obtain a compensated control signal;
and the control module 704 is configured to control the backlight module according to the compensated control signal.
The backlight control device provided by the embodiment obtains the control signal matched with the display picture of the liquid crystal panel by determining the mini LEDs to be compensated, wherein the mini LEDs to be compensated comprise the mini LEDs with abnormal display and the mini LEDs positioned at the edge and the corner of the backlight module, the control signal is used for controlling the brightness of the backlight module and compensating the mini LEDs to be compensated according to the control signal to obtain the compensated control signal, so that the backlight module is controlled according to the compensated control signal, the display balance of the backlight module can be effectively improved, an additional structure is not required to be added, the manufacturing time of the backlight module is saved, and the cost is reduced.
Optionally, the backlight module includes a plurality of mini LEDs, and the mini LEDs are arranged in rows and columns; the plurality of mini LEDs includes: mini LEDs located at the middle, mini LEDs located at the edges, and mini LEDs located at the corners; the mini LEDs at the edge are mini LEDs adjacent to three mini LEDs, and the mini LEDs at the corner are mini LEDs adjacent to two mini LEDs;
and the compensation value corresponding to the mini LED positioned at the corner is greater than the compensation value corresponding to the mini LED positioned at the edge.
Optionally, the obtaining module 702 is further configured to:
acquiring a display lookup table from an external memory, wherein the display lookup table comprises compensation values corresponding to mini LEDs to be compensated in the backlight module; and/or acquiring a compensation value corresponding to the mini LED to be compensated, which is input by a user;
correspondingly, the compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal includes:
and compensating the control signal according to the obtained compensation value to obtain a compensated control signal.
Optionally, the compensation value is a time-varying compensation value.
Optionally, the apparatus is applied to a backlight control system, where the backlight control system includes a timing controller, a dimming controller, and an LED driver;
the timing controller is used for sending backlight image data to the dimming controller;
the dimming controller is used for determining the duty ratio and/or the current value of the PWM signal according to the backlight image data and sending the duty ratio and/or the current value to the LED driver;
the LED driver is used for outputting a corresponding PWM signal to the mini LED according to the duty ratio and/or the current value;
the compensation module 703 is specifically configured to perform at least one of the following:
compensating the backlight image data corresponding to the mini LED to be compensated through the timing controller;
compensating the duty ratio and/or the current value corresponding to the mini LED to be compensated through the dimming controller;
and compensating the PWM signal of the mini LED to be compensated through the LED driver.
Optionally, before the compensation module 703 compensates the mini LED to be compensated according to the control signal to obtain a compensated control signal, the compensation module is further configured to:
after the backlight module is started each time, carrying out diagnosis test on an LED driver in the backlight module, and determining the LED driver with a fault;
for each mini LED in the backlight module, searching the position of an abnormal mini LED within a preset range around the mini LED, wherein the abnormal mini LED comprises the mini LED controlled by the LED driver with the fault;
and determining a corresponding compensation value according to the position of each mini LED and the position of the abnormal mini LED within the preset range.
Optionally, when the compensation module 703 compensates the duty ratio and/or the current value corresponding to the mini LED to be compensated, it is specifically configured to:
acquiring backlight image data sent by the timing controller, and inserting black image data between two adjacent frames of backlight image data;
and determining a dynamic compensation value corresponding to the PWM signal according to the alternating change time of the black image data and the backlight image data, and obtaining a compensated duty ratio and/or current value according to the dynamic compensation value.
For a specific implementation principle and beneficial effects of the backlight control device provided by this embodiment, reference may be made to the above embodiments, which are not described herein again.
Fig. 8 is a schematic structural diagram of a backlight control device according to an embodiment of the present invention. As shown in fig. 8, the backlight control apparatus may include: at least one processor 801 and memory 802;
the memory 802 stores computer-executable instructions;
the at least one processor 801 executes computer-executable instructions stored by the memory 802 to cause the at least one processor 801 to perform a method as in any of the embodiments described above.
For a specific implementation principle and beneficial effects of the backlight control device provided by this embodiment, reference may be made to the above embodiments, which are not described herein again.
The embodiment of the invention also provides a backlight control system, which comprises the backlight control equipment and the backlight module shown in the figure 8; wherein the backlight control device is a timing controller, a dimming controller or an LED driver; the backlight module comprises a plurality of mini LEDs, and the mini LEDs are used for displaying corresponding brightness under the control of the backlight control equipment.
For a specific implementation principle and beneficial effects of the backlight control system provided by this embodiment, reference may be made to the above embodiments, which are not described herein again.
An embodiment of the present invention further provides an electronic device, including the backlight control system and the liquid crystal panel described in any of the above embodiments. The backlight control system is used for providing backlight for the liquid crystal panel.
Optionally, the electronic device may be any device provided with an LED, such as a liquid crystal television, and the embodiment of the present invention is not limited thereto.
The structure, function, connection relationship, specific implementation principle, process, and effect of each component in the electronic device provided in this embodiment may be referred to in the foregoing embodiments, and are not described herein again.
The embodiment of the present invention further provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, the computer-executable instructions are used to implement the method according to any one of the foregoing embodiments.
An embodiment of the present invention further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the computer program implements the method described in any of the foregoing embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described device embodiments are merely illustrative, and for example, the division of the modules is only one logical division, and other divisions may be realized in practice, for example, a plurality of modules may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to implement the solution of the embodiment.
In addition, functional modules in the embodiments of the present invention may be integrated into one processing unit, or each module may exist alone physically, or two or more modules are integrated into one unit. The unit formed by the modules can be realized in a hardware form, and can also be realized in a form of hardware and a software functional unit.
The integrated module implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute some steps of the methods according to the embodiments of the present invention.
It should be understood that the Processor may be a Central Processing Unit (CPU), other general purpose Processor, a DIgital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the present invention may be embodied directly in a hardware processor, or in a combination of the hardware and software modules within the processor.
The memory may comprise a high-speed RAM memory, and may further comprise a non-volatile storage NVM, such as at least one disk memory, and may also be a usb disk, a removable hard disk, a read-only memory, a magnetic or optical disk, etc.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (Extended Industry Standard Architecture) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present invention are not limited to only one bus or one type of bus.
The storage medium may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.
An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an Application Specific Integrated Circuits (ASIC). Of course, the processor and the storage medium may reside as discrete components in an electronic device or host device.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof.

Claims (6)

1. A backlight control method, comprising:
determining mini LEDs to be compensated, wherein the mini LEDs to be compensated comprise mini LEDs with abnormal display and mini LEDs positioned at the edge and the corner of the backlight module;
acquiring a control signal matched with a display picture of a liquid crystal panel, wherein the control signal is used for controlling the brightness of the backlight module;
compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal;
controlling the backlight module according to the compensated control signal,
the backlight module comprises a plurality of mini LEDs, wherein the mini LEDs are arranged in rows and columns; the plurality of mini LEDs includes: mini LEDs located at the middle, mini LEDs located at the edges, and mini LEDs located at the corners; the mini LEDs at the edge are mini LEDs adjacent to three mini LEDs, and the mini LEDs at the corner are mini LEDs adjacent to two mini LEDs;
wherein the compensation value corresponding to the mini LED positioned at the corner is larger than the compensation value corresponding to the mini LED positioned at the edge, and the compensation value is a time-varying compensation value,
the method is applied to a backlight control system, and the backlight control system comprises a timing controller, a dimming controller and an LED driver;
the timing controller is used for sending backlight image data to the dimming controller;
the dimming controller is used for determining the duty ratio and/or the current value of a PWM signal according to the backlight image data and sending the duty ratio and/or the current value to the LED driver;
the LED driver is used for outputting a corresponding PWM signal to the mini LED according to the duty ratio and/or the current value;
the compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal, which includes at least one of the following:
compensating backlight image data corresponding to the mini LED to be compensated through the timing controller;
compensating the duty ratio and/or the current value corresponding to the mini LED to be compensated through the dimming controller;
compensating the PWM signal of the mini LED to be compensated through the LED driver,
compensating the duty ratio and/or the current value corresponding to the mini LED to be compensated, including:
acquiring backlight image data sent by the timing controller, and inserting black image data between two adjacent frames of backlight image data;
and determining a dynamic compensation value corresponding to the PWM signal according to the alternating change time of the black image data and the backlight image data, and obtaining a compensated duty ratio and/or current value according to the dynamic compensation value.
2. The method of claim 1, further comprising:
acquiring a display lookup table from an external memory, wherein the display lookup table comprises compensation values corresponding to mini LEDs to be compensated in the backlight module; and/or acquiring a compensation value corresponding to the mini LED to be compensated, which is input by a user;
correspondingly, the compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal includes:
and compensating the control signal according to the obtained compensation value to obtain a compensated control signal.
3. The method according to claim 1, before compensating the mini LED to be compensated according to the control signal to obtain a compensated control signal, further comprising:
after the backlight module is started each time, carrying out diagnosis test on an LED driver in the backlight module, and determining the LED driver with a fault;
for each mini LED in the backlight module, searching the position of an abnormal mini LED within a preset range around the mini LED, wherein the abnormal mini LED comprises the mini LED controlled by the LED driver with the fault;
and determining a corresponding compensation value according to the position of each mini LED and the position of the abnormal mini LED within the preset range.
4. A backlight control apparatus, comprising: a memory and at least one processor;
the memory stores computer-executable instructions;
the at least one processor executing the computer-executable instructions stored by the memory causes the at least one processor to perform the method of any of claims 1-3.
5. A backlight control system, comprising: the backlight control apparatus and backlight module of claim 4;
wherein the backlight control device is a timing controller, a dimming controller or an LED driver; the backlight module comprises a plurality of mini LEDs, and the mini LEDs are used for displaying corresponding brightness under the control of the backlight control equipment.
6. A computer-readable storage medium having computer-executable instructions stored thereon, which when executed by a processor, perform the method of any one of claims 1-3.
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