CN111554239A - Backlight control method, device and storage medium - Google Patents
Backlight control method, device and storage medium Download PDFInfo
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- CN111554239A CN111554239A CN202010438874.0A CN202010438874A CN111554239A CN 111554239 A CN111554239 A CN 111554239A CN 202010438874 A CN202010438874 A CN 202010438874A CN 111554239 A CN111554239 A CN 111554239A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
- G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
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Abstract
The application discloses a backlight control method, a backlight control device and a storage medium. The LED lamps of the backlight lamp plate are circularly lightened according to the scanning sequence of the grid lines and the data lines, and each LED lamp is circularly lightened in K sub-fields one by one, so that the brightness of the LED lamps of the backlight lamp plate is evenly distributed in all the sub-fields, the instantaneous peak current of the backlight lamp plate is further reduced, the temperature of a power supply circuit is reduced, and the stability of the whole system is improved.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a backlight control method and apparatus, and a storage medium.
Background
With the vigorous development of the information-oriented society, the demand of people on information display is more and more urgent and wide, and the demand is more and more severe. The panel industry display technology has evolved rapidly and has grown to maturity since the 90 s of the 20 th century. The flat panel display has the advantages of high definition, good image color, power saving, light weight, portability and the like, and is widely applied to the information display products, so the flat panel display has wide market prospect. The panel industry is driving the increasing maturity, opportunities and challenges that follow. Due to the limitations of Liquid Crystal Display (LCD) backlight, such as large power consumption and low contrast ratio, the backlight is forced to be locally controllable (Local dimming).
The conventional sub-millimeter Light Emitting Diode (miniLED) backlight is a Local Dimming backlight implemented by a static driving scheme or a Passive Matrix (PM) driving scheme. Since each zone needs to be controlled by one data line (data line), the number of the zones is generally lower than 2000 zones, and the number of required driving ICs is too many, which results in high product cost. Therefore, only if a technical scheme for reducing the cost is found, the actual mass production product can be seen in the market. The driving method of the Mini LED backlight module based on the Active Matrix (AM for short) becomes a scheme for effectively reducing the number of LED driving chips to achieve cost reduction.
In both non-subfield and equal-subfield backlight local control, the problem of excessive instantaneous peak current of the backlight panel cannot be solved in some pictures, which causes the temperature rise of the power circuit of the system, affects the performance of the whole system, and derives the problems of Electromagnetic Interference (EMI for short) and noise.
Disclosure of Invention
The embodiment of the application provides a backlight control method, a backlight control device and a storage medium, which can effectively solve the problems that the temperature of a power supply circuit is increased due to overlarge instantaneous peak current of a backlight lamp panel, the performance of the whole system is influenced, electromagnetic interference and noise are derived, and the like.
According to a first aspect of the present application, an embodiment of the present application provides a backlight control method, which is applied to a display panel, where the display panel includes a backlight panel, and the method includes: equally dividing each frame of picture displayed by the display panel into a plurality of subfields; acquiring a gray scale value K required to be displayed by the display panel, wherein K is a positive integer; and controlling each LED lamp in the backlight lamp panel to circularly light K sub-fields one by one.
Further, in the step of equally dividing each frame image displayed by the display panel into a plurality of subfields, equally dividing each unit frame image into 2 according to the gray scale level N displayed by the display panelN-1 sub-fields, where N is a positive integer.
Further, each LED lamp is turned on in a cycle according to the scanning sequence of the gate lines and the data lines of the display panel.
Further, the gate line is turned on once in each of the subfields.
Further, in the same frame, the duty ratio of the light emitting time of each sub-field is the same.
According to a second aspect of the present application, an embodiment of the present application provides a backlight control device, which is applied to a display panel, wherein the display panel includes a backlight panel, and the backlight control device includes: an equally dividing module, configured to equally divide each frame of picture displayed by the display panel into a plurality of subfields; the acquisition module is used for acquiring a gray-scale value K required to be displayed by the display panel, wherein K is a positive integer; and the control module is used for controlling each LED lamp in the backlight lamp panel to circularly light K sub-fields one by one.
Further, equally dividing each frame into 2 frames according to the gray scale level N displayed by the display panelN-1 sub-fields, where N is a positive integer.
Further, each of the LED lamps is cyclically lighted according to the scanning sequence of the gate lines and the data lines.
Further, the gate line is turned on once in each of the subfields.
According to a second aspect of the present application, an embodiment of the present application provides a storage medium having a plurality of instructions stored therein, the instructions being adapted to be loaded by a processor to execute the backlight control method described above.
The advantage of this application lies in, compares in prior art, and this application is through the LED lamp with the lamp plate in a poor light lamp according to the scanning order circulation light of gate line and data line to each LED lamp circulates K subfields one by one, thereby with the luminance evenly distributed of the LED lamp of the lamp plate in a poor light at each subfield, further reduce the lamp plate in a poor light lamp instantaneous peak current, in order to reduce power supply circuit temperature, and improve whole system stability.
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The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a gate waveform for controlling a backlight of a non-equal subfield according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a gate waveform for controlling the subfield backlight according to an embodiment of the present application.
Fig. 3 is a schematic diagram of a lamp current of an LED controlled by a non-uniform subfield backlight according to an embodiment of the present application.
Fig. 4 is a schematic diagram of an LED lamp current controlled by an subfield backlight according to an embodiment of the present application.
Fig. 5 is a schematic flowchart illustrating steps of a backlight control method according to an embodiment of the present disclosure.
Fig. 6 is a schematic structural diagram of a backlight panel provided in an embodiment of the present application.
Fig. 7a-7c show the lighting condition of the LED according to the embodiment of the present application.
Fig. 8 is a flowchart illustrating steps of a backlight control apparatus according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
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; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. In this embodiment, the analog display screen touch unit is connected to the head tracking unit, and is configured to acquire a moving path of a sensing cursor in the display device.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The embodiment of the application provides a non-equal subfield backlight control method, and the grid waveform of the non-equal subfield backlight control method is shown as figure 1.
Taking 240Hz, 7bit gray scale backlight as an example, the time of each frame (frame) is 4.16ms, which is divided into 2^7-1 equal parts, each equal part is 32.8 u. If the LED lamp is to display B ═ 0001101BGray scale of which B0]1 denotes the lowest bit, B [6 ]]0 represents the highest bit. The number of bit display times corresponding to each sub-field (SF) is 2nIncrement, in which bit 0 shows 2^0Second, bit 1 shows 2^1Sub … … bit 6 display 2^6Next, the process is carried out. The 1 st subfield SF1 corresponds to the 0 th bit; the 2 nd subfield SF2 corresponds to the 1 st bit … … and the 7 th subfield SF7 corresponds to the 6 th bit.
According to the embodiment of the application, the number of the LED driving chips is effectively reduced through backlight control of the non-equal sub-fields, so that the cost is reduced. However, researches show that the TFT may have serious leakage current, and the current of the mini LED lamp is reduced, so that the phenomenon of uneven backlight brightness is generated.
As shown in fig. 2, an embodiment of the present application further provides an subfield backlight control method to solve the backlight brightness non-uniformity phenomenon, and a gate waveform of the subfield backlight control method is shown in fig. 2.
Taking 240Hz, 7bit gray scale backlight as an example, the time of each frame is 4.16ms, which is divided into 2^7-1 equal parts, each equal part is 32.8 u. If the LED lamp is to display B ═ 0001101BGray scale of which B0]1 denotes the lowest bit, B [6 ]]0 represents the highest bit. The number of bit display times corresponding to each sub-field (SF) is 2nIncrement, in which bit 0 shows 2^0Second, bit 1 shows 2^1Sub … … bit 6 display 2^6Next, the process is carried out. The 1 st subfield SF1 corresponds to the 0 th bit; the 2 nd subfield SF2 corresponds to the 1 st bit … … and the 7 th subfield SF7 corresponds to the 6 th bit.
SF2 corresponds to LEThe 1 st bit of the gray scale is displayed by the D lamp, each grid line (gate) is opened twice, and the backlight lamp panel realizes twice scanning charging. Similarly, SF3 corresponds 2 nd bit of LED lamp display gray scale, and backlight lamp panel scans and charges 2^2Secondly, … …, SF7 corresponds to the 6 th bit of the gray scale displayed by the LED lamp, the backlight panel scans and charges 2^6Next, the process is carried out. The luminance accumulation effect of each SF is used to complete the backlight luminance display of one frame.
Because the TFT in the display panel has the leakage condition, the duration of the coupling capacitor holding potential is limited, the influence of the TFT leakage is obviously weakened by increasing the starting times of the TFT in the subfield control, the gray scale brightness of the backlight is more accurately controlled, and the phenomenon of uneven brightness of the backlight panel can be improved.
Referring to fig. 3 and 4, it is assumed that the backlight panel has a full LED lamp display B (0001101)BIn gray scale, all the LED lamps of the two driving methods are bright in the 1 st, 3 rd and 4 th sub-fields SF1, SF3 and SF4, the backlight current is maximum in the 3 sub-field time, the backlight is dark in the rest 4 sub-field time, and the backlight current is minimum in the 4 sub-field time, so that the power load of the backlight panel is constantly switched between maximum and minimum. The transient peak current is too large, which may cause a temperature rise of a power circuit of the display panel, affect the performance of the entire device, and cause problems such as electromagnetic interference and noise.
Referring to fig. 5, the present application preferably provides a backlight control method to solve the above problem. The backlight control method is applied to a display panel, wherein the display panel comprises a backlight panel, and the method comprises the following steps.
Step S51, equally dividing each frame of picture displayed by the display panel into a plurality of subfields.
In the embodiment of the present application, each frame of the display panel is equally divided into 2 frames according to the gray scale level N displayed by the display panelN-1 sub-fields, where N is a positive integer.
Step S52, obtaining a gray scale value K required to be displayed by the display panel, where K is a positive integer.
And step S53, controlling each LED lamp in the backlight lamp panel to circularly light K sub-fields one by one.
In the embodiment of the application, each LED lamp is turned on circularly according to the scanning sequence of the gate lines and the data lines of the display panel. In each of the subfields, the gate line is turned on once. In the same frame, the duty ratio of the light emitting time of each subfield is the same. By the implementation, the brightness of the LED lamps of the backlight panel can be uniformly distributed in each equal subfield, so that the instantaneous peak current of the backlight panel is reduced, the temperature of a power supply circuit is reduced, and the stability of the whole system is improved.
Full LED Lamp of backlight panel (4row x 6col) display B ═ 0001101B＝(13)DFor example, the backlight panels are arranged in the order of 1-24 by scanning the gate lines (e.g., gate1, gate2, gate3 …) and the data lines (e.g., data 1, data 2, data 3 …), as shown in FIG. 6. The 1 st LED lights the 1 st to 13 th subfields, as shown in FIG. 7a, the 2 nd LED lights the 14 th to 26 th subfields, as shown in FIG. 7b, … …, and the 10 th LED lights 118 to 127 and 1 to 3 subfields, as shown in FIG. 7 c. The other LED lamps of the backlight lamp panel also light corresponding equal sub-fields according to the circulation sequence, so that the brightness of each LED in the backlight lamp panel is almost evenly distributed in each equal sub-field (at most 1 equal sub-field), the current of the LED is as a smooth straight line in the graph 4, the problem of large instantaneous peak current of the backlight lamp panel can be effectively solved, the temperature of a power supply circuit is reduced, and the stability of the whole system is improved.
Referring to fig. 8, the present application provides a backlight control device applied to a display panel, where the display panel includes a backlight panel, and the device includes an equally dividing module 801, an obtaining module 802, and a control module 803.
The dividing module 801 is configured to divide each frame of picture displayed by the display panel into a plurality of subfields.
In the embodiment of the present application, each frame of the display panel is equally divided into 2 frames according to the gray scale level N displayed by the display panelN-1 sub-fields, where N is a positive integer.
The obtaining module 802 is configured to obtain a gray scale value K that needs to be displayed by the display panel, where K is a positive integer.
The control module 803 is configured to control each LED lamp in the backlight panel to cycle on K subfields one by one.
In the embodiment of the application, each LED lamp is turned on circularly according to the scanning sequence of the gate lines and the data lines of the display panel. In each of the subfields, the gate line is turned on once. In the same frame, the duty ratio of the light emitting time of each subfield is the same. By the design, the brightness of the LED lamps of the backlight lamp panel can be uniformly distributed in all the equal sub-fields, so that the instantaneous peak current of the backlight lamp panel is reduced, the temperature of a power supply circuit is reduced, and the stability of the whole system is improved.
It will be understood by those skilled in the art that all or part of the steps of the methods of the above embodiments may be performed by instructions or by instructions controlling associated hardware, and the instructions may be stored in a computer-readable storage medium and loaded and executed by a processor. To this end, embodiments of the present application provide a storage medium, in which a plurality of instructions are stored, and the instructions can be loaded by a processor to execute the steps in any one of the backlight control methods provided in the embodiments of the present application.
Wherein the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
Since the instructions stored in the storage medium can execute the steps in any of the backlight control methods provided in the embodiments of the present application, the beneficial effects that can be achieved by any of the backlight control methods provided in the embodiments of the present application can be achieved, which are detailed in the foregoing embodiments and will not be described again here.
The advantage of this application lies in, compares in prior art, and this application is through the LED lamp with the lamp plate in a poor light lamp according to the scanning order circulation light of gate line and data line to each LED lamp circulates K subfields one by one, thereby with the luminance evenly distributed of the LED lamp of the lamp plate in a poor light at each subfield, further reduce the lamp plate in a poor light lamp instantaneous peak current, in order to reduce power supply circuit temperature, and improve whole system stability.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The principle and the implementation of the present application are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A backlight control method is applied to a display panel, wherein the display panel comprises a backlight panel, and the method is characterized by comprising the following steps:
equally dividing each frame of picture displayed by the display panel into a plurality of subfields;
acquiring a gray scale value K required to be displayed by the display panel, wherein K is a positive integer; and
and controlling each LED lamp in the backlight lamp panel to circularly light K sub-fields one by one.
2. The backlight control method of claim 1, wherein in the step of equally dividing each frame of picture displayed by the display panel into a plurality of subfields, the frame of picture is equally divided into 2 according to the gray scale level N displayed by the display panelN-1 sub-fields, where N is a positive integer.
3. The backlight control method of claim 1, wherein each of the LED lamps is cyclically turned on according to a scanning order of the gate lines and the data lines of the display panel.
4. The backlight control method of claim 1, wherein the gate line is turned on once in each of the subfields.
5. The backlight control method of claim 1, wherein a duty ratio of a light emitting time of each of the subfields is the same in a same frame picture.
6. The utility model provides a controlling means is shaded, is applied to display panel, and wherein display panel includes a backlight plate, its characterized in that, controlling means is shaded includes:
an equally dividing module, configured to equally divide each frame of picture displayed by the display panel into a plurality of subfields;
the acquisition module is used for acquiring a gray-scale value K required to be displayed by the display panel, wherein K is a positive integer; and
and the control module is used for controlling each LED lamp in the backlight lamp panel to circularly light K sub-fields one by one.
7. The backlight control device as claimed in claim 6, wherein the each frame is equally divided into 2 according to the gray scale level N displayed by the display panelN-1 sub-fields, where N is a positive integer.
8. The backlight control device as claimed in claim 6, wherein each of the LED lamps is cyclically turned on according to a scanning order of the gate lines and the data lines.
9. The backlight control device of claim 6, wherein the gate lines are turned on once in each of the subfields.
10. A storage medium having stored therein a plurality of instructions adapted to be loaded by a processor to perform the backlight control method of any one of claims 1 to 5.
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| CN112767887A (en) * | 2021-01-22 | 2021-05-07 | Tcl华星光电技术有限公司 | Backlight control method, backlight control system and storage medium |
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| US11682356B2 (en) | 2021-04-20 | 2023-06-20 | Huizhou China Star Optoelectronics Display Co., Ltd. | Driving method, driving circuit, and display device |
| CN113160761B (en) * | 2021-04-20 | 2023-10-03 | 惠州市华星光电技术有限公司 | Driving method, driving circuit and display device |
| CN114023269A (en) * | 2021-10-14 | 2022-02-08 | 厦门中莘光电科技有限公司 | Mini/Micro-LED driver chip with monolithic integrated optical signal receiving module |
| CN114023269B (en) * | 2021-10-14 | 2023-04-14 | 厦门中莘光电科技有限公司 | Mini/Micro-LED driver chip with monolithic integrated optical signal receiving module |
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Application publication date: 20200818 |