CN114220386B - MiniLed display screen brightness adjusting method conforming to human eye visual characteristics - Google Patents
MiniLed display screen brightness adjusting method conforming to human eye visual characteristics Download PDFInfo
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- CN114220386B CN114220386B CN202111409373.0A CN202111409373A CN114220386B CN 114220386 B CN114220386 B CN 114220386B CN 202111409373 A CN202111409373 A CN 202111409373A CN 114220386 B CN114220386 B CN 114220386B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000000007 visual effect Effects 0.000 title claims abstract description 13
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000013507 mapping Methods 0.000 claims description 5
- 230000007704 transition Effects 0.000 abstract description 5
- 230000016776 visual perception Effects 0.000 abstract description 2
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008447 perception Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention relates to a MiniLed display screen brightness adjusting method conforming to human eye visual characteristics, which comprises the following steps: 1. and judging the maximum brightness level, the minimum brightness and the like in the brightness adjustment process, and determining the corresponding display brightness and the corresponding PWM high-level pulse count. 2. And (3) performing gamma2.2 curve fitting on the brightness adjustment curve according to an algorithm, and calculating PWM high-level pulse count after fitting of each level in the middle. 3. Judging the adjusting frequency corresponding to each grade in the adjusting process, wherein the adjusting frequency is 80Hz in 1-30 percent stage, 50Hz in 31-80 percent stage and 30Hz in 81-100 percent stage; 4. the backlight is adjusted according to the PWM high-level pulse count set by the adjustment frequency. The method accords with the visual perception characteristic of human eyes, has smooth transition, no jitter and no overlarge variation of high and low brightness stages in the brightness adjusting process.
Description
Technical Field
The invention belongs to the field of brightness adjustment methods, and particularly relates to a MiniLed display screen brightness adjustment method conforming to human eye visual characteristics.
Background
The MiniLed display screen adopts a direct type multi-partition backlight scheme, and can display higher and lower brightness than the traditional side-entry backlight, so that the contrast ratio is improved, and a better display effect is realized. As the luminance range expands, higher demands are placed on the luminance adjustment. And because human eyes have nonlinear recognition characteristics on brightness perception, the human eyes are more sensitive to low-brightness change perception. An increase in brightness of 5nit from 10nit to 15nit is more perceptible to the human eye than an increase from 100nit to 105nit, as is the case.
The common luminance adjusting schemes with equal ratio and same frequency do not accord with the visual characteristics of human eyes, and the conditions of uneven luminance transition and jitter on visual effects often occur, so that a better luminance adjusting method is required to be found according to the visual characteristics of human eyes.
Disclosure of Invention
The invention aims to provide a MiniLed display screen brightness adjusting method which accords with human eye visual characteristics.
The technical scheme for solving the technical problems is as follows:
the MiniLed display screen brightness adjusting method conforming to the visual characteristics of human eyes comprises the following steps:
step 1, determining a maximum brightness Level (level_Max) in the current adjusting process and a minimum brightness Level (level_Min) in the current adjusting process, wherein the corresponding maximum display brightness is level_Max×N, the minimum display brightness is level_Min×N, and the corresponding PWM high-Level pulse counts are level_Max×N×M and level_Max×N×M respectively; wherein N is the proportion coefficient of PWM duty ratio and display screen brightness, M is the proportion coefficient of PWM high level pulse count and brightness;
step 2, obtaining a fitted brightness curve corresponding to the brightness adjustment curve in the current adjustment process according to a gamma2.2 curve mapping algorithm, and further obtaining PWM high-level pulse counts corresponding to each brightness level after fitting;
and step 3, determining the adjusting frequency corresponding to each brightness level in the adjusting process, and setting PWM high-level pulse count to adjust the brightness backlight of the display screen according to the adjusting frequency and the PWM high-level pulse count corresponding to each brightness level.
Further, in the step 3, the adjusting frequency is set to 80Hz corresponding to the stage of 1% -30% of brightness, the adjusting frequency is set to 50Hz corresponding to the stage of 31% -80% of brightness, and the adjusting frequency is set to 30Hz corresponding to the stage of 81% -100% of brightness.
Further, N is 10.
Further, M is 15.
Further, the gamma2.2 curve mapping algorithm formula is:
PwnCnt＝L×M；
wherein: pwmCnt is the PWM high level pulse count corresponding to the fitted brightness level, L_temp is the brightness presented by the corresponding brightness level, and L is the rounded value of L_temp.
The beneficial effects of the invention are as follows: the method of the invention can accord with the visual characteristics of human eyes on the perception of brightness, gradually and smoothly adjust the brightness of the MiniLed display screen, jitter can not occur in the brightness adjusting process, and the human eyes perceive that the brightness is smooth in transition, so that a better visual effect is presented.
Description of the drawings
Fig. 1 is a schematic view of a brightness adjustment curve from 1% to 100% before and after fitting.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
In the invention, the MiniLed display screen uses a singlechip chip to control the brightness through PWM, the brightness level corresponds to the PWM duty ratio, the brightness is in linear proportion to the PWM duty ratio, the proportion coefficient is N, and the high-level pulse count and the brightness proportion coefficient of the PWM are designed in a targeted manner. Namely, the brightness adjustment level is 1% -100%, and the corresponding display screen presents brightness as follows: brightness level×n, PWM high level pulse count is: brightness level x N x M.
The maximum value (level_max×n) and the minimum value (level_min×n) of the brightness present in the current adjustment process are calculated from the adjusted brightness Level. And (3) calculating a brightness value to be mapped for each point under the curve state of gamma2.2 by fitting the brightness adjusting curve of the section according to an algorithm, and setting PWM high-level width counting.
gamma2.2 curve mapping algorithm:
PwnCnt＝L×M
rounding and rounding the display brightness L_temp to obtain brightness L, wherein L×M is the PWM high level count PwmCnt to be set.
Wherein:
PwmCnt is the pulse count of the high level setting PWM counter.
L_temp is the brightness presented by the corresponding level.
L is a rounding value for l_temp.
N is the proportion coefficient of PWM duty ratio and display screen brightness.
M is the high level pulse count and brightness proportionality coefficient of PWM.
Level is the brightness Level to be set.
level_Min is the minimum brightness Level in the current adjusting process; if the current action is to increase the brightness, the brightness level of the current display is the brightness level, and if the current action is to decrease the brightness, the brightness level is the target brightness level.
level_Max is the maximum brightness Level in the current adjusting process; if the current action is to increase the brightness, the target brightness level is obtained, and if the current action is to decrease the brightness, the current brightness level is obtained.
When the backlight adjusting effect is observed on the MiniLed display screen used in the invention and the same brightness adjusting frequency (50 Hz) is used, the change of low brightness is easier to be perceived, the feeling of unsmooth brightness adjustment exists, and the perception of the change of high brightness stage is not obvious. In this regard, the brightness adjustment frequency at the low brightness stage of 1% -30% is 80Hz, and the adjustment frequency at the stage of 81% -100% is 30Hz. The brightness adjusting effect is observed, the fixed adjusting frequency is compared, and different frequencies are used, so that the visual effect of human eyes is greatly improved.
The invention defines that N is 10 and M is 15 on a MiniLed display screen, namely the brightness of the display screen is 1000nit when the brightness level of the display screen is 100, the corresponding PWM duty ratio is 100%, and the PWM high-level pulse count is 15000.
When the brightness level needs to be adjusted from 1% to 100%, the following brightness transition conditions are implemented, and the following conditions are shown in table 1:
TABLE 1
According to the above data, the brightness adjustment curves adjusted from 1% to 100% before and after fitting are shown in the following fig. 1, and it can be seen from fig. 1 that the brightness adjustment curves after fitting are similar to the gamma2.2 curves of 256 gray scales of the display, rise slowly at low brightness, rise quickly at high brightness, and accord with the visual perception characteristics of human eyes. Meanwhile, the transition effect can be further optimized by increasing the adjusting frequency of low brightness and reducing the adjusting frequency of high brightness.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The MiniLed display screen brightness adjusting method conforming to the visual characteristics of human eyes is characterized by comprising the following steps:
step 1, determining a maximum brightness Level (level_Max) in the current adjusting process and a minimum brightness Level (level_Min) in the current adjusting process, wherein the corresponding maximum display brightness is level_Max×N, the minimum display brightness is level_Min×N, and the corresponding PWM high-Level pulse counts are level_Max×N×M and level_Max×N×M respectively; wherein N is the proportion coefficient of PWM duty ratio and display screen brightness, M is the proportion coefficient of PWM high level pulse count and brightness;
step 2, obtaining a fitted brightness curve corresponding to the brightness adjustment curve in the current adjustment process according to a gamma2.2 curve mapping algorithm, and further obtaining PWM high-level pulse counts corresponding to each brightness level after fitting; the gamma2.2 curve mapping algorithm formula is as follows:
PwnCnt＝L×M；
wherein: pwmCnt is the PWM high level pulse count corresponding to the fitted brightness level, L_temp is the brightness presented by the corresponding brightness level, and L is the rounded value of L_temp; and step 3, determining the adjusting frequency corresponding to each brightness level in the adjusting process, and setting PWM high-level pulse count to adjust the brightness backlight of the display screen according to the adjusting frequency and the PWM high-level pulse count corresponding to each brightness level.
2. The brightness adjustment method of the MiniLed display screen according to claim 1, wherein in the step 3, the adjustment frequency is 80Hz corresponding to the stage of 1% -30% brightness, the adjustment frequency is 50Hz corresponding to the stage of 31% -80% brightness, and the adjustment frequency is 30Hz corresponding to the stage of 81% -100% brightness.
3. The method for adjusting brightness of a MiniLed display screen according to claim 1, wherein N is 10.
4. The method for adjusting brightness of a MiniLed display screen according to claim 1, wherein M is 15.
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| CN202111409373.0A CN114220386B (en) | 2021-11-25 | 2021-11-25 | MiniLed display screen brightness adjusting method conforming to human eye visual characteristics |
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| CN114220386B true CN114220386B (en) | 2023-07-25 |
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| US8400393B2 (en) * | 2008-03-27 | 2013-03-19 | Himax Technologies Limited | Method of controlling backlight module, backlight controller and display device using the same |
| CN106782298A (en) * | 2017-01-18 | 2017-05-31 | 深圳市金研微科技有限公司 | A kind of brightness adjusting method of LED display screen system |
| CN110738960B (en) * | 2019-11-29 | 2021-02-02 | 上海天马有机发光显示技术有限公司 | Display device and control method and device thereof |
| CN110930945A (en) * | 2019-12-20 | 2020-03-27 | 西安易朴通讯技术有限公司 | Method, device and system for adjusting brightness of display screen |
| CN112181017A (en) * | 2020-09-17 | 2021-01-05 | 武汉海微科技有限公司 | Temperature protection algorithm based on vehicle-mounted display screen |
| CN112669764B (en) * | 2020-12-25 | 2021-09-14 | 深圳市金研微科技有限公司 | Display brightness uniformity adjusting method |
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Address after: Room 572, 18th Floor, Building B4, Phase I, Longshan Innovation Park, Wuhan Future Science and Technology City, No. 999 Gaoxin Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province, 430000 Patentee after: Wuhan Haiwei Technology Co.,Ltd. Country or region after: China Address before: 1588-2, 15th floor, building B3, zone 2, National Geospatial Information Industry base, No. 3, wudayuan 4th Road, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee before: WUHAN HAIWEI TECHNOLOGY Co.,Ltd. Country or region before: China |