CN109461413B - Backlight driving method and device and liquid crystal display device - Google Patents
Backlight driving method and device and liquid crystal display device Download PDFInfo
- Publication number
- CN109461413B CN109461413B CN201910008558.7A CN201910008558A CN109461413B CN 109461413 B CN109461413 B CN 109461413B CN 201910008558 A CN201910008558 A CN 201910008558A CN 109461413 B CN109461413 B CN 109461413B
- Authority
- CN
- China
- Prior art keywords
- backlight
- data
- driving
- sub
- original
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
Disclosed herein is a backlight driving method including: the main control module receives an original synchronous signal and an original backlight driving signal of each frame of image data; the main control module carries out N frequency multiplication on the received original synchronous signals to generate first synchronous signals, divides the backlight area into N different sub-areas, and respectively loads the original backlight driving signals of the N backlight sub-areas into N frames of backlight data, wherein each frame of backlight data comprises effective driving data of one backlight sub-area and invalid driving data of N-1 backlight sub-areas; the main control module sends N times of first synchronous signals and N frames of backlight data to the backlight driving module in an original synchronous signal period. The technical scheme provides a backlight driving scheme which is simple in design and easy to commonly use among liquid crystal panels with different sizes, and synchronization of liquid crystal display and backlight driving is achieved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight driving method and device, and a liquid crystal display device.
Background
With the development of the liquid crystal display panel manufacturing industry, the requirements of high resolution AR (Augmented Reality)/VR (Virtual Reality)/TV (television)/MNT (display) on MPRT (Motion Picture Response Time) become more and more strict.
By using Mini LED (sub-millimeter light emitting diode) technology, finer backlight adjustment can be achieved, thereby reducing MPRT. The number of Mini LED light sources is large, and the Mini LED light sources can be divided into thousands of subareas for subarea control. However, the output channels of the conventional backlight driving chips are generally 16 channels, and a large number of backlight driving chips are required to realize the partition control.
In the related art, the main control module outputs control signals to the output channels of the backlight driving chips through the uniform SPI, and since data of the SPI is output serially, different output channels receive respective control signals through time delay, thereby ensuring the partition control of the backlight driving.
The delay calculation of thousands of backlight driving channels increases the design complexity of the backlight driving, and once the partitions are increased or decreased or the partition arrangement is changed, the delay data of all the backlight driving channels need to be recalculated, so that a large amount of repeated designs of liquid crystal panels with different sizes are caused, and manpower and material resources are wasted.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a backlight driving method, a backlight driving device and a liquid crystal display device, which can provide a backlight driving scheme that is simple in design and easy to be used commonly among liquid crystal panels of different sizes, and implement synchronization between liquid crystal display and backlight driving.
According to a first aspect of the present application, an embodiment of the present invention provides a backlight driving method, including: the main control module receives an original synchronous signal and an original backlight driving signal of each frame of image data; the main control module carries out N frequency multiplication on the received original synchronous signals to generate first synchronous signals, divides the backlight area into N different sub-areas, and respectively loads the original backlight driving signals of the N backlight sub-areas into N frames of backlight data, wherein each frame of backlight data comprises effective driving data of one backlight sub-area and invalid driving data of N-1 backlight sub-areas; the main control module sends N times of first synchronous signals and N frames of backlight data to the backlight driving module in an original synchronous signal period.
According to a second aspect of the present application, an embodiment of the present invention provides a backlight driving apparatus, including:
the main control module is used for receiving an original synchronous signal and an original backlight driving signal of each frame of image data; carrying out N frequency multiplication on the received original synchronous signals to generate first synchronous signals, dividing the backlight area into N different sub-areas, respectively bearing the original backlight driving signals of the N backlight sub-areas in N frames of backlight data, wherein each frame of backlight data comprises effective driving data of one backlight sub-area and invalid driving data of N-1 backlight sub-areas; in an original synchronizing signal period, sending N times of first synchronizing signals and N frames of backlight data to a backlight driving module;
and the backlight driving module is used for receiving a first synchronization signal and backlight data, and lighting or not lighting the backlight light source of the corresponding sub-area according to the backlight data under the control of the first synchronization signal.
According to a third aspect of the present application, an embodiment of the present invention provides a liquid crystal display device, including the above backlight driving device.
Compared with the related art, according to the backlight driving method and device and the liquid crystal display device provided by the embodiment of the invention, the main control module can realize transmission of a frame of original backlight driving signals by sending data packets for N times in one original synchronizing signal period through N frequency multiplication synchronizing signals, so that a large amount of calculation of delay data is avoided, synchronization of backlight driving and liquid crystal overturning is realized by a simpler and more convenient method, a uniform backlight driving scheme is easy to use among liquid crystal panels with different sizes, and the transportability of the backlight driving scheme is improved.
Drawings
Fig. 1 is a flowchart of a backlight driving method according to embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a backlight driving apparatus according to embodiment 2 of the present invention;
fig. 3 is a schematic view of a liquid crystal display device according to embodiment 3 of the present invention;
fig. 4 is a schematic view of a backlight driving apparatus according to example 1 of the present invention;
fig. 5 is a timing chart of LED driving of example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Example 1
As shown in fig. 1, an embodiment of the present invention provides a backlight driving method, including:
step S110: the main control module receives an original synchronous signal and an original backlight driving signal of each frame of image data;
step S120: the main control module carries out N frequency multiplication on the received original synchronous signals to generate first synchronous signals, divides the backlight area into N different sub-areas, and respectively loads the original backlight driving signals of the N backlight sub-areas into N frames of backlight data, wherein each frame of backlight data comprises effective driving data of one backlight sub-area and invalid driving data of N-1 backlight sub-areas;
step S130, the main control module sends N times of first synchronous signals and N frames of backlight data to the backlight driving module in an original synchronous signal period;
in the above embodiment, the main control module can transmit a frame of original backlight driving signals by sending data packets N times in an original synchronization signal period through N times of frequency doubling synchronization signals, that is, the main control module transmits data with N times of data amount in the same time by increasing the signal transmission speed of the output interface, thereby avoiding a large amount of calculation of delay data, and realizing synchronization of backlight driving and liquid crystal flipping with a simpler and more convenient method.
In one embodiment, the invalid driving data is used to make the backlight driving module not to light the backlight light source of the corresponding sub-region; the effective driving data is used for enabling the backlight driving module to light the backlight light source of the corresponding sub-area according to the value of the original backlight driving signal;
in one embodiment, the sending, by the main control module, the first synchronization signal and N frames of backlight data to the backlight driving module N times includes: the main control module sends N times of first synchronous signals and N frames of backlight data to the backlight driving module through the Serial Peripheral Interface (SPI);
in one embodiment, the backlight light source includes: a sub-millimeter light emitting diode Mini LED or a light emitting diode LED.
Example 2
As shown in fig. 2, an embodiment of the present invention provides a backlight driving apparatus, including:
the main control module 10 is configured to receive an original synchronization signal and an original backlight driving signal of each frame of image data; carrying out N frequency multiplication on the received original synchronous signals to generate first synchronous signals, dividing the backlight area into N different sub-areas, respectively bearing the original backlight driving signals of the N backlight sub-areas in N frames of backlight data, wherein each frame of backlight data comprises effective driving data of one backlight sub-area and invalid driving data of N-1 backlight sub-areas; in an original synchronizing signal period, sending N times of first synchronizing signals and N frames of backlight data to a backlight driving module;
the backlight driving module 20 is configured to receive a first synchronization signal and backlight data, and light or not light a backlight light source of a corresponding sub-region according to the backlight data under the control of the first synchronization signal;
in one embodiment, the invalid driving data is used to make the backlight driving module not to light the backlight light source of the corresponding sub-region; the effective driving data is used for enabling the backlight driving module to light the backlight light source of the corresponding sub-area according to the value of the original backlight driving signal;
in an embodiment, the main control module is configured to send the first synchronization signal and N frames of backlight data to the backlight driving module N times in the following manner: sending N times of first synchronous signals and N frames of backlight data to a backlight driving module through a Serial Peripheral Interface (SPI);
in one embodiment, the backlight light source includes: a sub-millimeter light emitting diode Mini LED or a light emitting diode LED.
Example 3
As shown in fig. 3, an embodiment of the present invention provides a liquid crystal display device, including the backlight driving device in embodiment 2.
Example 1
As shown in fig. 4, the present example provides a backlight driving apparatus including an MCU and a plurality of LED driving chips, each of which drives a plurality of LEDs.
As shown IN fig. 5, the MCU receives the IN VSYNC signal and the backlight driving signal of each frame of display image through the input SPI, where IN VSYNC is an initial synchronization signal that is used to synchronize the MCU with its input signals, and after each IN VSYNC, control signals for all LEDs IN a frame are sent to the MCU. The MCU divides the backlight area of one frame of display image into 8 different sub-areas, and carries the original backlight driving signals of the 8 backlight sub-areas in 8 frames of backlight data (such as data1, data2, …, data8 in fig. 5), respectively, each frame of backlight data only contains valid driving data of one backlight sub-area and invalid driving data of N-1 backlight sub-areas, where the invalid driving data can be represented by 0. For example, the 1 st frame backlight data (data1) contains LED driving data of the 1 st backlight sub-region, and other data in the backlight data frame are all 0. The 2 nd frame backlight data (data2) contains LED driving data of the 2 nd backlight sub-region, and other data in the backlight data frame are all 0. By analogy, the backlight data (data2) of the 8 th frame includes LED driving data of the 8 th backlight sub-region, and all other data in the backlight data frame are 0.
That is, the MCU multiplies the displayed synchronization signal IN VSYNC to output an OUT VSYNC signal (8 multiplied IN VSYNC signals). Serially transmitting 8 frames of backlight data IN one IN VSYNC period, and transmitting ith frame of backlight data (data)i) Then, the ith frame of backlight data (data)i) The data corresponding to the ith backlight sub-region is valid, and the data of the remaining 7 backlight sub-regions is 0 (invalid). After the LED driving chip receives backlight data, if the numerical value is zero, the LED lamp corresponding to the numerical value is not lightened, and if the numerical value is not zero, the driving current of the LED lamp is controlled according to the numerical value, so that the brightness of the LED lamp is controlled by the numerical value.
In the above example, the main control module can transmit a frame of original backlight driving signal by sending a data packet 8 times in one original synchronization signal period through 8 times of frequency doubling synchronization signals, thereby avoiding a large amount of calculation of delay data, realizing synchronization of backlight driving and liquid crystal turnover by a simpler and more convenient method, easily using a uniform backlight driving scheme among liquid crystal panels of different sizes, and improving the transportability of the backlight driving scheme.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
It should be noted that the present invention can be embodied in other specific forms, and various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A backlight driving method, comprising:
the main control module receives an original synchronous signal and an original backlight driving signal of each frame of image data;
the main control module carries out N frequency multiplication on the received original synchronous signals to generate first synchronous signals, divides the backlight area into N different sub-areas, and respectively loads the original backlight driving signals of the N backlight sub-areas into N frames of backlight data, wherein each frame of backlight data comprises effective driving data of one backlight sub-area and invalid driving data of N-1 backlight sub-areas;
the main control module sends N times of first synchronous signals and N frames of backlight data to the backlight driving module in an original synchronous signal period.
2. The method of claim 1, wherein:
the invalid driving data is used for enabling the backlight driving module not to light the backlight light source of the corresponding sub-area.
3. The method of claim 1, wherein:
the main control module sends the first synchronization signal and the N frames of backlight data to the backlight driving module for N times, and the method comprises the following steps:
the main control module sends the first synchronizing signal for N times and N frames of backlight data to the backlight driving module through the serial peripheral interface SPI.
4. The method of claim 2, wherein:
the backlight light source includes: a sub-millimeter light emitting diode Mini LED or a light emitting diode LED.
5. A backlight driving apparatus, comprising:
the main control module is used for receiving an original synchronous signal and an original backlight driving signal of each frame of image data; carrying out N frequency multiplication on the received original synchronous signals to generate first synchronous signals, dividing the backlight area into N different sub-areas, respectively bearing the original backlight driving signals of the N backlight sub-areas in N frames of backlight data, wherein each frame of backlight data comprises effective driving data of one backlight sub-area and invalid driving data of N-1 backlight sub-areas; in an original synchronizing signal period, sending N times of first synchronizing signals and N frames of backlight data to a backlight driving module;
and the backlight driving module is used for receiving a first synchronization signal and backlight data, and lighting or not lighting the backlight light source of the corresponding sub-area according to the backlight data under the control of the first synchronization signal.
6. The apparatus of claim 5, wherein:
the invalid driving data is used for enabling the backlight driving module not to light the backlight light source of the corresponding sub-area.
7. The apparatus of claim 5, wherein:
the main control module is used for sending the first synchronization signal and the N frames of backlight data to the backlight driving module for N times in the following mode: and sending the first synchronization signal for N times and the N frames of backlight data to the backlight driving module through the Serial Peripheral Interface (SPI).
8. The apparatus of claim 5, wherein:
the backlight light source includes: a sub-millimeter light emitting diode Mini LED or a light emitting diode LED.
9. A liquid crystal display device comprising the backlight driving device as claimed in any one of claims 5 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910008558.7A CN109461413B (en) | 2019-01-04 | 2019-01-04 | Backlight driving method and device and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910008558.7A CN109461413B (en) | 2019-01-04 | 2019-01-04 | Backlight driving method and device and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109461413A CN109461413A (en) | 2019-03-12 |
| CN109461413B true CN109461413B (en) | 2021-01-26 |
Family
ID=65615935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910008558.7A Active CN109461413B (en) | 2019-01-04 | 2019-01-04 | Backlight driving method and device and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109461413B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110136654B (en) * | 2019-04-03 | 2021-01-26 | 深圳康佳电子科技有限公司 | Dimming backlight partition dimming control method, intelligent terminal and storage medium |
| 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 |
| CN112419987A (en) * | 2020-11-27 | 2021-02-26 | 京东方科技集团股份有限公司 | Backlight driving method and device and display system |
| CN113160760B (en) * | 2021-04-12 | 2022-09-27 | Tcl华星光电技术有限公司 | Time schedule controller, driving method thereof and display device |
| CN115735246A (en) * | 2021-04-26 | 2023-03-03 | 京东方科技集团股份有限公司 | Backlight data transmission method, micro control unit and local backlight adjusting system |
| CN113506545B (en) * | 2021-06-28 | 2022-05-17 | 惠科股份有限公司 | Backlight driving method, backlight driving device, computer equipment and storage medium |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11194749A (en) * | 1998-01-05 | 1999-07-21 | Matsushita Electric Ind Co Ltd | Liquid crystal display device and driving method therefor |
| KR100815916B1 (en) * | 2006-02-09 | 2008-03-21 | 엘지.필립스 엘시디 주식회사 | Apparatus and method for driving of liquid crystal display device |
| KR101354233B1 (en) * | 2006-12-28 | 2014-01-23 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| JP5344846B2 (en) * | 2008-03-31 | 2013-11-20 | ゴールドチャームリミテッド | Display panel control device, liquid crystal display device, electronic device, and display panel drive control method |
| CN101783114B (en) * | 2009-01-19 | 2011-12-28 | 深圳市新超亮特种显示设备有限公司 | Dynamic backlight control system for LCD partitioning |
| TWI415096B (en) * | 2009-06-23 | 2013-11-11 | Ili Technology Corp | Method for back light control and apparatus thereof |
| JP5081208B2 (en) * | 2009-08-07 | 2012-11-28 | シャープ株式会社 | Liquid crystal display |
| CN102708808B (en) * | 2012-06-18 | 2016-08-10 | 深圳Tcl新技术有限公司 | The driving method of backlight of television LED, drive circuit and television set |
| KR20140144539A (en) * | 2013-06-11 | 2014-12-19 | 삼성전자주식회사 | A display device and driving method of thereof |
| CN108022563B (en) * | 2018-01-31 | 2020-08-28 | 武汉华星光电技术有限公司 | Low-delay liquid crystal display device based on partitioned backlight and driving method thereof |
| CN109036298B (en) * | 2018-10-23 | 2021-01-22 | 京东方科技集团股份有限公司 | Backlight driving method and device and display equipment |
-
2019
- 2019-01-04 CN CN201910008558.7A patent/CN109461413B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109461413A (en) | 2019-03-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109461413B (en) | Backlight driving method and device and liquid crystal display device | |
| US11176895B2 (en) | Backlight driving device, driving method, backlight module and display device | |
| CN108470548B (en) | Liquid crystal display device, control method thereof, head-mounted display equipment and medium | |
| US11334307B2 (en) | Image display method and video processing device | |
| US20230282156A1 (en) | Led driver circuit, multi-wire communication device and method for led display system | |
| US20180235052A1 (en) | Light source apparatus and control method thereof | |
| CN110800038B (en) | Display driving circuit, display device and display method based on time division data output | |
| US20240330079A1 (en) | Data communication method and electronic device | |
| EP3469577B1 (en) | Light emitting diode display device and method of operating the same | |
| CN103503466A (en) | Method and apparatus for fast data delivery on a digital pixel cable | |
| US11455941B2 (en) | Control device, display device and operation method thereof | |
| CN113205785A (en) | Frame display signal synchronization method, display device, electronic apparatus, and storage medium | |
| CN108399881B (en) | Display driving circuit, mobile terminal and display driving method | |
| CN106935184A (en) | The driving method of flat-panel display device | |
| TWI767702B (en) | Backlight driving method and backlight driving module of scanning display | |
| TWI778604B (en) | Frame display signal synchronization method, display device and information processing device | |
| US20240363054A1 (en) | Circuit component, electronic device and driving method | |
| US12039944B2 (en) | Backlight data transmission method, micro control unit and local dimming backlight system | |
| TWI825938B (en) | Screen control system | |
| CN116052603A (en) | Image processing method, device and system | |
| CN213958042U (en) | Display device | |
| US20240257771A1 (en) | Backlight driving method and display device | |
| CN118131519B (en) | Gray compensation method and device, backlight driver and display device | |
| TW201133451A (en) | Method for increasing backlight brightness resolution and method for modulating backlight brightness | |
| US20240257708A1 (en) | Display system and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220118 Address after: 100015 No. 10, Jiuxianqiao Road, Beijing, Chaoyang District Patentee after: BOE TECHNOLOGY GROUP Co.,Ltd. Patentee after: BOE crystal core technology Co., Ltd Address before: 100015 No. 10, Jiuxianqiao Road, Beijing, Chaoyang District Patentee before: BOE TECHNOLOGY GROUP Co.,Ltd. Patentee before: BOE Optoelectronics Technology |