WO2015135187A1 - 一种背光亮度的调节方法及电子设备 - Google Patents
一种背光亮度的调节方法及电子设备 Download PDFInfo
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- WO2015135187A1 WO2015135187A1 PCT/CN2014/073402 CN2014073402W WO2015135187A1 WO 2015135187 A1 WO2015135187 A1 WO 2015135187A1 CN 2014073402 W CN2014073402 W CN 2014073402W WO 2015135187 A1 WO2015135187 A1 WO 2015135187A1
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- WIPO (PCT)
- Prior art keywords
- brightness
- backlight
- electronic device
- backlight brightness
- target value
- Prior art date
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000008859 change Effects 0.000 claims description 47
- 230000008569 process Effects 0.000 abstract description 10
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 238000001914 filtration Methods 0.000 description 29
- 238000010586 diagram Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
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- 230000003287 optical effect Effects 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000016776 visual perception Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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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
- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
-
- 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
- G09G2320/0613—The adjustment depending on the type of the information to be displayed
- G09G2320/062—Adjustment of illumination source parameters
-
- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
Definitions
- the present invention relates to the field of liquid crystal display manufacturing, and in particular, to a method and an electronic device for adjusting brightness of a backlight.
- LCDs liquid crystal displays
- the LCD is a passively illuminated display, and its display has a four-fold relationship with the brightness of the LCD backlight and ambient brightness.
- the brightness of the LCD backlight must be adjusted to a high level to ensure a clear display of the LCD; when in a dimly lit room, the brightness of the LCD backlight needs to be kept low to ensure a clear display of the LCD.
- the prior art proposes Light Adaptive Brightness Control (LABC) and content-compatible backlight control (Content Adaptive). Brightness Control, abbreviated as CABC).
- CLEC Light Adaptive Brightness Control
- CABC Content-compatible backlight control
- the application processor (Application Processor, AP for short) first checks the ambient brightness, and then calculates the current LCD backlight brightness according to the ambient brightness, and calculates the calculated LCD backlight brightness. Transmission to the LCD driver circuit, so that the LCD driver circuit can output Pulse Width Modulation (PWM) signals to the backlight driver module, thereby adjusting the brightness of the current LCD backlight; if the ambient brightness exceeds a certain range, the electronic device will Restart the above process to readjust the brightness of the LCD backlight.
- PWM Pulse Width Modulation
- Embodiments of the present invention provide a method for adjusting backlight brightness and an electronic device for solving the problem that a user may see a significant flicker phenomenon during dimming during LCD backlight brightness adjustment.
- an embodiment of the present invention uses the following technical solution:
- an electronic device including: a brightness sensor, and a microcontroller connected to the brightness sensor;
- the brightness sensor is configured to acquire an ambient brightness signal at a current time
- the microcontroller is configured to read an ambient brightness signal of the current time in the brightness sensor, and calculate a first backlight brightness target value of the electronic device according to the ambient time signal of the current time;
- the microcontroller is further configured to gradually adjust from a first backlight brightness initial value to the first backlight brightness target value when the electronic device is in a normal bright screen state, and the first backlight brightness initial value is a previous value.
- the first backlight brightness target value of the electronic device at the moment.
- the microcontroller is specifically used to:
- the first backlight brightness target value of the electronic device at the current time is calculated according to the ambient brightness signal at the current time after the filtering.
- the microcontroller is specifically used to:
- the electronic device further includes: an application processor, and the application a processor, a display driving module connected to the microcontroller, and a backlight driving module connected to the microcontroller;
- the application processor is configured to output an image to the display driving module
- the display driving module is configured to acquire, according to an image input by the application processor, a second backlight brightness target value of the electronic device at a current time;
- the microcontroller is configured to multiply the first backlight brightness target value and the second backlight brightness target value to obtain a third backlight brightness target value of the electronic device, and the third backlight brightness
- the target value is output to the backlight driving module
- the backlight driving module is configured to adjust a backlight brightness of the electronic device according to the third backlight brightness target value.
- the fourth possible implementation manner of the first aspect is further provided, where the application processor is further configured to send an indication message to the microcontroller; The indication message is used to instruct the microcontroller to turn the brightness sensor on or off.
- an embodiment of the present invention provides a method for adjusting backlight brightness, which is applied to an electronic device, and the adjustment method includes:
- the first backlight brightness initial value is gradually adjusted to the first backlight brightness target value; the first backlight brightness initial value is the first time of the electronic device at a previous time. Backlight brightness target value.
- the calculating, according to the ambient brightness signal of the current moment, that the first backlight of the electronic device is bright at the current moment The target values include:
- the first backlight brightness target value of the electronic device at the current time is calculated according to the ambient brightness signal at the current time after the filtering.
- the step of adjusting from the initial value of the first backlight brightness to the first backlight brightness target value includes:
- the adjusting method further comprising: receiving an image according to the input electronic device Obtaining a second backlight brightness target value of the electronic device at the current moment;
- An embodiment of the present invention provides a method for adjusting backlight brightness and an electronic device, wherein a brightness sensor is used to acquire an ambient brightness signal at a current time; and the microcontroller is configured to read an ambient brightness signal at a current time in the brightness sensor, Calculating, according to the ambient brightness signal of the current time, a first backlight brightness target value of the electronic device at the current time, and if the electronic device is in a normal bright screen state, gradually adjusting from the initial value of the first backlight brightness to the first a backlight brightness target value, the first backlight brightness initial value is a first backlight brightness target value of the electronic device at a previous time, and
- FIG. 1 is a schematic diagram showing changes in luminance of an LCD backlight in an LABC method provided by the prior art
- FIG. 2 is a schematic diagram of an electronic device according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of a prior art first-order lag filtering algorithm
- FIG. 4 is a schematic diagram of an ambient light filtering effect obtained by using a first-order lag algorithm according to an embodiment of the present invention
- FIG. 5 is a schematic diagram of a sensitivity curve of a human eye to brightness according to an embodiment of the present invention
- FIG. 6 is a schematic diagram of another electronic device according to an embodiment of the present invention
- FIG. 8 is a schematic diagram of another method for adjusting backlight brightness according to an embodiment of the present invention.
- an embodiment of the present invention provides an electronic device.
- the electronic device includes: a brightness sensor 21, and a micro controller 22 connected to the brightness sensor 21;
- the brightness sensor 21 is configured to acquire an ambient brightness signal at a current time;
- the microcontroller 22 is configured to read an ambient brightness signal of the current time in the brightness sensor 21, and calculate a first backlight brightness target value of the electronic device according to the ambient time signal of the current time;
- the microcontroller 22 is further configured to gradually adjust from a first backlight luminance initial value to the first backlight luminance target value when the electronic device is in a normal bright screen state, where the first backlight luminance initial value is The first backlight brightness target value of the electronic device at a time.
- the ambient brightness signal may be obtained by the brightness sensor 21 for acquiring an optical signal in a current environment, and converting the acquired optical signal into an electrical signal; the electrical signal may be a current signal or a voltage signal.
- the first backlight brightness target value is obtained according to the principle of Light Adaptive Brightness Control (LABC).
- the microcontroller 22 is configured to perform filtering processing on the read ambient brightness signal at the current moment to obtain an ambient luminance signal at the current moment after filtering;
- the first backlight brightness target value of the electronic device at the current time is calculated according to the ambient brightness signal at the current time after the filtering.
- the microcontroller 22 performs filtering processing on the continuously read ambient light to obtain a filtered ambient light curve, obtains a current ambient light brightness from the ambient light curve, and obtains a first backlight according to the ambient light brightness. Brightness target value.
- the microcontroller 22 When the microcontroller 22 reads the ambient brightness signal of the current time, if the brightness sensor 21 suddenly points to a strong illuminant such as a light lamp or a sun, but the sudden change data is not an actual change in the ambient brightness, The ambient brightness signal of the current time that needs to be read is filtered to obtain an actual ambient brightness change, that is, an ambient brightness signal at the current time after filtering is obtained; wherein the filtering process may be an algorithm for various smoothed data. , such as averaging method, weighting method, interpolation method, etc.
- the microcontroller 22 uses a first-order lag filtering algorithm to filter the ambient luminance signal at the current time of the reading, and obtains the filtered ambient luminance signal at the current moment.
- microcontroller 22 is specifically configured to:
- the first first backlight brightness intermediate value may be the first backlight brightness target value of the electronic device, if the current time and the last time ambient brightness signal change is small, then the first The initial value of the brightness change corresponding to the initial value of the backlight brightness is adjusted according to the initial rate of the brightness change, and the first backlight brightness target value of the electronic device can be achieved after one adjustment.
- the first backlight brightness is initially The value needs to be adjusted to the first backlight brightness target value of the electronic device by using a plurality of first backlight brightness intermediate values; specifically, the initial brightness change initial rate corresponding to the first backlight brightness initial value is obtained, according to the brightness change Adjusting an initial rate to an intermediate value of the first first backlight brightness; obtaining an intermediate rate of brightness change corresponding to the intermediate value of the first backlight brightness, and changing an intermediate rate according to the brightness Adjusted to the second first backlight brightness intermediate value, and so on, until adjusted to the first backlight brightness target value of the electronic device.
- the initial rate of the brightness change corresponding to the initial value of the first backlight brightness and the intermediate rate of the brightness change corresponding to the intermediate value of the first backlight brightness should be the fastest change at the fastest rate. Adjusting the brightness of the first backlight to adjust to the first backlight brightness target value of the electronic device without causing visual perception of the human eye; when the screen brightness of the electronic device is dark, the screen brightness is changed The longer the time should be, the smaller the rate of hopping should be. When the screen brightness of the electronic device is brighter, the time for the brightness of the screen to fade should be shorter, and the rate of hopping should be faster.
- the sensitivity curve of the human eye to brightness under different ambient brightness is obtained. Through this curve, an asymptotic result of the maximum speed change without causing visual perception of the human eye can be found.
- the meaning of the brightness change slope curve shown in Figure 5 is that under certain ambient light, when the first backlight brightness value changes from the initial value to the target value, the slope of the change approaches the brightness sensitivity curve, so that the maximum change can be obtained.
- the amount of brightness and the speed of follow-up is the fastest, so as not to cause the human eye to visually detect and achieve the best display effect.
- the electronic device further includes: an application processor 23, a display driving module 24 connected to the application processor 23, the microcontroller 22, and the microcontroller 22 connected backlight drive module 25;
- the application processor 23 is configured to output an image to the display driving module 24; the display driving module 24 is configured to acquire, according to the image input by the application processor 23, the second backlight brightness of the electronic device at the current time.
- Target value is configured to acquire, according to the image input by the application processor 23, the second backlight brightness of the electronic device at the current time.
- the microcontroller 22 is configured to multiply the first backlight brightness target value and the second backlight brightness target value to obtain a third backlight brightness target value of the electronic device, And outputting the third backlight brightness target value to the backlight driving module 25;
- the backlight driving module 25 is configured to adjust a backlight brightness of the electronic device according to the third backlight brightness target value.
- the second backlight brightness target value is obtained according to the Content Adaptive Brightness Control (CABC) principle.
- CABC Content Adaptive Brightness Control
- the application processor 23 is further configured to send an indication message to the microcontroller 22; the indication message is used to instruct the microcontroller 22 to turn the brightness sensor 21 on or off.
- the indication message may be a power on or power off command; when the microcontroller 22 receives the power on command sent by the application processor 23, the microcontroller 22 turns on the brightness sensor 21, when When the microcontroller 22 receives the close command sent by the application processor 23, the microcontroller 22 turns off the brightness sensor 21.
- the indication message may also be a wake-up or sleep command; when the microcontroller 22 receives the wake-up command sent by the application processor 23, the microcontroller 22 turns on the brightness sensor 21 when the micro When the controller 22 receives the sleep command transmitted by the application processor 23, the microcontroller 22 turns off the brightness sensor 21.
- the indication message may also be a command for adjusting the brightness of the backlight; when the microcontroller 22 receives the command to adjust the brightness of the backlight sent by the application processor 23, the microcontroller 22 turns on the brightness sensor 21 The microcontroller 22 turns off the brightness sensor 21 when the microcontroller 22 receives a command sent by the application processor 23 that does not perform backlight brightness adjustment.
- An embodiment of the present invention provides an electronic device including a brightness sensor, and a microcontroller connected to the brightness sensor, wherein the brightness sensor is configured to acquire an ambient brightness signal at a current time;
- the device is configured to read an ambient brightness signal of the current time in the brightness sensor, and calculate a first backlight brightness target value of the electronic device at the current time according to the ambient brightness signal of the current time, if the electronic device is in a normal bright screen State, gradually from the initial value of the first backlight brightness Adjusting to the first backlight brightness target value, the first backlight brightness initial value is the first backlight brightness target value of the electronic device at the previous time, and the user is seen to adjust the brightness during the LCD backlight brightness adjustment process.
- the problem of obvious flickering in the light process is the problem of obvious flickering in the light process.
- the embodiment of the present invention further provides a method for adjusting the brightness of a backlight.
- the adjustment method is applied to an electronic device. As shown in FIG. 7, the adjustment method includes:
- the ambient luminance signal is an electrical signal that converts the optical signal; the electrical signal may be a current signal or a voltage signal, which is of course not limited thereto.
- the first backlight brightness target value is obtained according to the LABC principle.
- the calculating, according to the ambient brightness signal of the current moment, the first backlight brightness target value of the electronic device at the current moment includes:
- the first backlight brightness target value of the electronic device at the current time is calculated according to the ambient brightness signal at the current time after the filtering.
- the electronic device is in a normal bright state, gradually adjust from a first backlight brightness initial value to the first backlight brightness target value; the first backlight brightness initial value is a previous time of the electronic device.
- the first backlight brightness target value is a previous time of the electronic device.
- the stepwise adjusting from the first backlight luminance initial value to the first backlight luminance target value includes:
- the method further includes:
- the second backlight brightness target value is obtained according to the CABC principle.
- An embodiment of the present invention provides a method for adjusting backlight brightness by acquiring an ambient luminance signal at a current time; and calculating, according to the ambient luminance signal at the current moment, a first backlight luminance target value of the electronic device at the current moment;
- the first backlight brightness initial value is gradually adjusted to the first backlight brightness target value;
- the first backlight brightness initial value is the first backlight brightness of the electronic device at a previous time.
- the target value solves the problem that the user will see the obvious flickering phenomenon during the dimming process during the brightness adjustment of the LCD backlight.
- the disclosed system, apparatus, and method may be implemented in other manners.
- the device embodiments described above are merely illustrative.
- the division of the unit is only a logical function division.
- there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not executed.
- the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.
- each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit.
- the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
- the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
- the software functional unit described above is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform portions of the steps of the various embodiments of the present invention.
- the foregoing storage medium includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or an optical disk, and the like, which can store program codes. Medium.
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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CN201480032786.3A CN105308674A (zh) | 2014-03-13 | 2014-03-13 | 一种背光亮度的调节方法及电子设备 |
KR1020167026266A KR20160124888A (ko) | 2014-03-13 | 2014-03-13 | 백라이트 밝기 조절 방법 및 전자 장치 |
US15/124,275 US10013924B2 (en) | 2014-03-13 | 2014-03-13 | Method for adjusting backlight brightness and electronic device |
PCT/CN2014/073402 WO2015135187A1 (zh) | 2014-03-13 | 2014-03-13 | 一种背光亮度的调节方法及电子设备 |
EP14885829.3A EP3098806B1 (en) | 2014-03-13 | 2014-03-13 | Backlight brightness regulation method and electronic device |
JP2016556924A JP2017513050A (ja) | 2014-03-13 | 2014-03-13 | バックライト輝度を調整するための方法及び電子デバイス |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/CN2014/073402 WO2015135187A1 (zh) | 2014-03-13 | 2014-03-13 | 一种背光亮度的调节方法及电子设备 |
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WO2015135187A1 true WO2015135187A1 (zh) | 2015-09-17 |
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PCT/CN2014/073402 WO2015135187A1 (zh) | 2014-03-13 | 2014-03-13 | 一种背光亮度的调节方法及电子设备 |
Country Status (6)
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US (1) | US10013924B2 (zh) |
EP (1) | EP3098806B1 (zh) |
JP (1) | JP2017513050A (zh) |
KR (1) | KR20160124888A (zh) |
CN (1) | CN105308674A (zh) |
WO (1) | WO2015135187A1 (zh) |
Cited By (3)
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CN107845366A (zh) * | 2016-09-19 | 2018-03-27 | 华为技术有限公司 | 一种背光调节方法及装置 |
CN108346411A (zh) * | 2017-01-22 | 2018-07-31 | 中兴通讯股份有限公司 | 一种背光亮度调节方法、装置及终端 |
CN111816141A (zh) * | 2020-07-02 | 2020-10-23 | 深圳市华星光电半导体显示技术有限公司 | 一种显示方法及显示装置 |
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US20180211607A1 (en) * | 2017-01-24 | 2018-07-26 | Séura, Inc. | System for automatically adjusting picture settings of an outdoor television in response to changes in ambient conditions |
CN109791756A (zh) * | 2017-06-20 | 2019-05-21 | 深圳市柔宇科技有限公司 | 头戴显示设备的亮度调节方法及装置 |
CN110211548B (zh) * | 2018-02-28 | 2021-03-30 | 华为技术有限公司 | 调整显示亮度的方法和电子设备 |
WO2020181528A1 (zh) * | 2019-03-13 | 2020-09-17 | 西安诺瓦电子科技有限公司 | 环境参数获取方法、装置及系统和显示终端及亮度调节方法 |
CN111968560B (zh) * | 2020-08-31 | 2023-10-24 | 维沃移动通信有限公司 | 显示参数调整方法、装置和电子设备 |
CN116206570A (zh) * | 2021-11-30 | 2023-06-02 | 北京讯通安添通讯科技有限公司 | 一种屏幕背光亮度调整方法和调整系统 |
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- 2014-03-13 JP JP2016556924A patent/JP2017513050A/ja active Pending
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- 2014-03-13 WO PCT/CN2014/073402 patent/WO2015135187A1/zh active Application Filing
- 2014-03-13 KR KR1020167026266A patent/KR20160124888A/ko not_active Application Discontinuation
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JP2017513050A (ja) | 2017-05-25 |
EP3098806B1 (en) | 2020-07-29 |
US10013924B2 (en) | 2018-07-03 |
US20170018233A1 (en) | 2017-01-19 |
CN105308674A (zh) | 2016-02-03 |
KR20160124888A (ko) | 2016-10-28 |
EP3098806A4 (en) | 2017-03-15 |
EP3098806A1 (en) | 2016-11-30 |
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