WO2017031237A1 - Dispositif d'affichage électronique avec adaptation environnementale des caractéristiques d'affichage basée sur l'emplacement - Google Patents

Dispositif d'affichage électronique avec adaptation environnementale des caractéristiques d'affichage basée sur l'emplacement Download PDF

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Publication number
WO2017031237A1
WO2017031237A1 PCT/US2016/047412 US2016047412W WO2017031237A1 WO 2017031237 A1 WO2017031237 A1 WO 2017031237A1 US 2016047412 W US2016047412 W US 2016047412W WO 2017031237 A1 WO2017031237 A1 WO 2017031237A1
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WO
WIPO (PCT)
Prior art keywords
sunrise
sunset
display
gamma
electronic display
Prior art date
Application number
PCT/US2016/047412
Other languages
English (en)
Inventor
John Schuch
William Dunn
Rick De Laet
Dan Safstrom
Harry Presley
Jerry Wasinger
Original Assignee
Manufacturing Resources International, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US15/043,135 external-priority patent/US10321549B2/en
Application filed by Manufacturing Resources International, Inc. filed Critical Manufacturing Resources International, Inc.
Priority to KR1020177036455A priority Critical patent/KR102130667B1/ko
Priority to CA2985673A priority patent/CA2985673C/fr
Priority to AU2016308187A priority patent/AU2016308187B2/en
Priority to EP16837775.2A priority patent/EP3338273A4/fr
Priority to JP2017558690A priority patent/JP2018525650A/ja
Publication of WO2017031237A1 publication Critical patent/WO2017031237A1/fr

Links

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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/16—Controlling the light source by timing means
    • 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
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • 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
    • 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

Definitions

  • FIGURE 2 is a block diagram for a signal encoding and decoding process.
  • FIGURE 3 is a graphical representation of image signal transformations per ITU-R BT.709/1886.
  • FIGURE 5 is a graphical representation of end-to-end power vs. ambient illumination in a discrete implementation.
  • FIGURE 18 provides a logical flowchart for performing an embodiment that uses the AAS technique during sunset/sunrise transition times while using a nighttime/daytime level for the remaining times.
  • a subtle but very germane aspect of Figure 1 is that the total light that is reflected from a physical object is essentially the linear summation of the reflected light from all light sources that impinge upon the object.
  • an object may also emit its own light, and this light is also linearly added to the reflected contributions from the object in order to arrive at the total observed light.
  • the absolute brightness or luminance of any point in a scene is proportional to all constituent components of light that are traceable to that point. This is the reality that is presented to the human observer of a real scene, and is also the manner in which computer-generated scenery is typically created.
  • Gamma (symbolized by ⁇ ) refers to the mathematic exponent in a power function S Y that transforms the scaling of gray levels (on a sub-pixel basis) in an image.
  • FIG. 1 The conceptually simplest image reproduction stream is illustrated in Figure 2.
  • a detector commonly a solid-state pixilated detector using CCD or CMOS technology
  • O/E optical-to- electrical
  • This image signal is typically a voltage signal that is approximately proportional to the amount of light falling on each pixilated detector element, but S s may be immediately converted into a digital signal.
  • the source image signal S s may originate from computer-generated graphics that are typically developed in the linear domain in much the same way as light behaves in the real world.
  • the a exponent is referred to as a gamma-correction exponent, but for the purposes of this discussion it will be referred to more generally as a signal encoding exponent.
  • the decoded image signal Sd is then used to drive the components in the display that convert the electrical image data into light that is emitted by the display (L 0 ) via an electrical-to-optical (E/O) conversion process.
  • E/O electrical-to-optical
  • the details of the E/O process are unique to the display technology; e.g., LCD, plasma, OLED, etc.
  • the decoding function d was an integral part of the E/O conversion process.
  • Eq(l) can be implemented in a discrete fashion, as illustrated in Figure 5.
  • the number of discretized levels illustrated in Figure 5 is representative; various embodiments of the invention may implement an arbitrary number of discrete levels, depending on the processing abilities and application.
  • the video source 150 can be any number of devices which generate and/or transmit video data, including but not limited to television/cable/satellite transmitters, DVD/Blue Ray players, computers, video recorders, or video gaming systems.
  • the display controller 110 may be any combination of hardware and software that utilizes the location-based ambient environment data and modifies the video signal based on the calibration data.
  • the calibration data 120 is preferably a nonvolatile data storage which is accessible to the display controller that contains calibration data for the location-based ambient environment data and optionally including reflectance information for the display assembly.
  • the display 300 can be any electronic device which presents an image to the viewer.
  • the desired brightness (i.e., maximum luminance) of a display may change, but perhaps the most obvious case is when displays are used outdoors.
  • the ambient light illumination that surrounds the display may vary anywhere from the dark of night to the full sun of midday - roughly a factor of ten million, or 7 orders of magnitude.
  • a specific adaptation level depends on the integrated field-of-view of the eye (nearly hemispherical) taking into account all viewable objects and sources of light in this range. Since a display will only occupy some fraction of the total field-of-view then the maximum brightness of the display should be varied to accommodate the overall adaptation of human vision to various light levels, which of course would include the light from the display itself.
  • an exemplary embodiment of the invention provides a means of automatically adjusting the black level and/or the gamma of a display according to pre-defined rules, such as but not limited to those previously discussed.
  • FIG. 8 The conceptually and functionally easiest location to perform autonomous black level and linearity adjustments are after the normal image signal decoding process, as generally illustrated in Figure 8.
  • the signal flow is similar to that described previously in Figure 2, except that now a new signal processing block labeled f v has been inserted into the signal flow for the purposes of providing automatic, real-time image signal adjustment in response to varying environmental conditions (i.e., an environmentally-reactive adjustment).
  • the processing block represented by f v can be viewed as a post-decoding processor since it operates after the normal signal decoding processor that is represented by fd.
  • the ambient environmental conditions can be determined based on the geographical location of the display and based on the calendar date, the approximate times of sunrise and sunset can be calculated and compared to the current time in order to determine what the ambient environmental conditions currently are.
  • the system can determine the sunrise/sunset times based on these coordinates and store them within the electronic storage on the display controller 110.
  • the location data can be converted to sunrise/sunset times by accessing any number of online databases, including but not limited to: www.sunrisesunset.com, www.suncalc.net, and various NOAA online tools. Additionally the latitude and longitude data can be used to calculate sunrise/sunset times based on the sunrise equation:
  • ⁇ is the latitude of the observer on the Earth.
  • St desired gray level threshold as a fraction of the full-scale input signal
  • Eq(5) An example of the functionality of Eq(5) is illustrated in Figure 14.
  • the requested black level has been set at 0.1
  • the requested black level threshold has been set to 0.05
  • the linearity modifier exponent ⁇ has been set to 1.20.
  • St desired gray level threshold as a fraction of the full-scale input signal
  • Sb desired black level offset as a fraction of the full-scale output signal
  • ⁇ linearity modifier power exponent (assuming power law modification)
  • the linear ramp between (So, 0) and (St, St.) serve to reduce the aforementioned banding effect.
  • the encoded image signal S e and environmentally- reactive control signal S a are preferably fed into the image signal processing block labeled f v which, in an exemplary embodiment, produces a pre-decoding image signal S p according to Eq( 7 ) below.
  • Eq( 7 ) represents the processing functionality of block f p , accepting the input signals S a and S e and outputting the signal S p .
  • a new feature of this embodiment is the introduction of a gray level turn-off point labeled So, leading to the three conditional cases expressed in Eq( 7 ).
  • the 1 st condition is applicable when the encoded signal levels fall below a level that is derived from So, in which case those signal levels are set to 0 (i.e., full black).
  • the 2 nd condition in Eq( 7 ) is applicable for encoded signal levels that fall above the level derived from St.
  • St desired gray level threshold as a fraction of the full-scale input signal
  • ⁇ linearity modifier power exponent (assuming power law modification)
  • the encoding exponent a and the decoding exponent ⁇ are known quantities, as assumed in Eq( 7 ), then the final signal linearity beyond the gray level threshold St is determined solely by the value of the linearity modifier exponent ⁇ ; i.e., ⁇ is equivalent to the previously defined end-to-end linearity power exponent ⁇ .
  • the encoding exponent a is typically known based on the source of the image data, and the decoding exponent ⁇ is either given by the manufacturer of the display and/or can be determined by testing.
  • Eq( 7 ) offers a specific example of the processes described in this section based on a specific method of signal encoding/decoding, but the general process is the same for any other method of encoding/decoding.
  • Eq( 7 ) An example of the functionality of Eq( 7 ) is illustrated in Figure 16.
  • the requested black level offset has been set at 0.1
  • the requested gray level turn-off has been set to 0.02
  • the gray level threshold has been set to 0.05
  • the linearity modifier exponent ⁇ has been set to 1.20.
  • Eq(8) The BT.709 encoding process is described by Eq(8).
  • the 1 st condition in Eq(8) is intended to prevent a nearly infinite slope in the transform function for small signals (i.e., darkest gray levels), as would be the case for a purely power-law function, that would be problematic for noise at such low levels.
  • the BT.1886 decoding process is simply a power-law transformation as described by Eq(9).
  • the encoded image signal S e and environmentally- reactive control signal S a are fed into the image signal processing block labeled f v which, in an exemplary embodiment, produces a pre-decoding image signal S P according to Eq(10) below which represents the processing functionality of block f ? , accepting the input signals S a and S e and outputting the signal S p .
  • the break point at S s 0.018 in the encoding process described by Eq(8) leads to the two sets of conditional cases as expressed in Eq(10).
  • the 2 nd set of conditions in Eq(10) is applicable when the encoded signal level S e is greater than 0.081, leading to three more sub- conditions 2a-2c that are dependent on the encoded signal level S e relative to the black level transition parameters So and St.
  • Eq(10) a sine function has been implemented for the black level transition for conditions lb and 2b, although there many functions that could be used for this purpose.
  • Gamma symbolized by ⁇ generally refers to the mathematic exponent in a power function S Y that transforms the scaling of gray levels (on a sub-pixel basis) in an image.
  • the exemplary embodiments of the system can select a desired yfor the display, depending on the data from an ambient light sensor or, as shown in Figure 8, data related to the sunset and sunrise times for the location of the display, without requiring the use of actual data from an ambient light sensor. Taking this concept even further, the embodiment below allows various display settings, specifically gamma ( ⁇ ) or the black level to be selected based on artificial ambient light sensor data (AAS data), without requiring the use of actual data from an ambient light sensor.
  • AAS data artificial ambient light sensor data
  • anomalies in the display environment can sometimes create variations in the ambient light sensor data that can cause the display to change brightness levels drastically, even though the surrounding environment has not changed quite as drastically.
  • the ambient light sensor may be positioned within a shadow while the rest of the display is not. This select- shadowing can be caused by a number of obstructions, including but not limited to light posts, trees, passing vehicles, and/or construction equipment.
  • Other anomalies can create variability in the ambient light sensor data, including variations in: the response of each different sensor, the response of the sensor over temperature changes, variations in the positioning of the light sensor in each display, and variations in the typical ambient environment of the display over time.
  • generating artificial ambient sensor data involves defining the following parameters:
  • the artificial ambient sensor (AAS) data can be calculated in the following manner, where t 1 provides the time in transition (i.e. t 1 varies between zero and t sr ).
  • AAS for sunrise (t 1 * HA)/t sr .
  • AAS for sunset HA - (t 1 * HA)/t ss .
  • the desired backlight level can be determined from any of the ambient light vs. display settings described above.
  • FIGURE 18 provides a logical flowchart for performing an embodiment that uses the AAS technique during sunset/sunrise transition times while using a nighttime/daytime level for the remaining times.
  • the sunset transition period and the sunrise transition period may be similar or substantially the same. In this case, it may not be necessary to have two transition periods. Instead, one transition period may be used.
  • FIGURE 19 provides a logical flowchart for performing an embodiment that uses the AAS technique with only a single transition period while using nighttime/daytime instructions for the remaining times.
  • the system and method can also utilize local weather information to further tailor the display settings, without requiring actual data from the ambient light sensor.
  • the local weather information can be obtained from available web APIs or other online weather information which may be accessed at a predetermined time interval (ex. every 15 minutes).
  • a weather factor WF is used where:
  • C 1 Clearness percentage with a higher percentage representing a clear sky and a lower percentage representing a large amount of cloud cover.
  • the inversion could be used, where a higher percentage represents more cloud cover and a lower percentage represents less cloud cover. Either technique can be used by a person of ordinary skill in the art.
  • the artificial ambient sensor (AAS) data can be calculated in the following manner.
  • AAS for sunset (HA*WF) - (t 1 * (HA*WF))/t ss .
  • AAS HA*WF.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Selon des modes de réalisation cités à titre d'exemple, la présente invention concerne un dispositif d'affichage électronique avec un dispositif de commande d'affichage en connexion électrique avec le dispositif d'affichage électronique et conçu pour commander le dispositif d'affichage électronique pour fonctionner selon des instructions de nuit si l'instant présent est entre le lever du soleil et du coucher du soleil, sans accepter une quelconque entrée provenant d'un capteur de lumière ambiante, et commander le dispositif d'affichage électronique pour fonctionner selon des instructions de jour si l'instant présent est entre le coucher du soleil et le lever du soleil, sans accepter une quelconque entrée provenant d'un capteur de lumière ambiante. Les instructions de nuit peuvent comprendre un premier réglage pour le gamma, tandis que les instructions de jour peuvent comprendre un second réglage pour le gamma. Les périodes de transition autour du lever du soleil et du coucher du soleil peuvent être calculées à l'aide de données de capteur de conditions ambiantes artificielles (AAS), avec des réglages supplémentaires pour le gamma choisis sur la base des données AAS.
PCT/US2016/047412 2015-08-17 2016-08-17 Dispositif d'affichage électronique avec adaptation environnementale des caractéristiques d'affichage basée sur l'emplacement WO2017031237A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020177036455A KR102130667B1 (ko) 2015-08-17 2016-08-17 위치 기반 디스플레이 특성의 환경 적응을 갖춘 전자 디스플레이
CA2985673A CA2985673C (fr) 2015-08-17 2016-08-17 Dispositif d'affichage electronique avec adaptation environnementale des caracteristiques d'affichage basee sur l'emplacement
AU2016308187A AU2016308187B2 (en) 2015-08-17 2016-08-17 Electronic display with environmental adaptation of display characteristics based on location
EP16837775.2A EP3338273A4 (fr) 2015-08-17 2016-08-17 Dispositif d'affichage électronique avec adaptation environnementale des caractéristiques d'affichage basée sur l'emplacement
JP2017558690A JP2018525650A (ja) 2015-08-17 2016-08-17 位置に基づくディスプレイ特性の環境適応を伴う電子ディスプレイ

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
US201562206050P 2015-08-17 2015-08-17
US62/206,050 2015-08-17
US15/043,135 2016-02-12
US15/043,135 US10321549B2 (en) 2015-05-14 2016-02-12 Display brightness control based on location data
US15/043,100 US9924583B2 (en) 2015-05-14 2016-02-12 Display brightness control based on location data
US15/043,100 2016-02-12
US201662314073P 2016-03-28 2016-03-28
US62/314,073 2016-03-28

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EP (1) EP3338273A4 (fr)
JP (1) JP2018525650A (fr)
KR (1) KR102130667B1 (fr)
AU (1) AU2016308187B2 (fr)
CA (1) CA2985673C (fr)
WO (1) WO2017031237A1 (fr)

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US10321549B2 (en) 2015-05-14 2019-06-11 Manufacturing Resources International, Inc. Display brightness control based on location data
US10412816B2 (en) 2015-05-14 2019-09-10 Manufacturing Resources International, Inc. Display brightness control based on location data
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EP3338273A1 (fr) 2018-06-27
KR102130667B1 (ko) 2020-07-06
JP2018525650A (ja) 2018-09-06
CA2985673A1 (fr) 2017-02-23
AU2016308187B2 (en) 2019-10-31
CA2985673C (fr) 2021-03-23
AU2016308187A1 (en) 2017-11-30
EP3338273A4 (fr) 2019-09-18
KR20180008757A (ko) 2018-01-24

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