GB2493931A - Display Device Brightness and Dynamic Range Compression Control - Google Patents

Display Device Brightness and Dynamic Range Compression Control Download PDF

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Publication number
GB2493931A
GB2493931A GB1114439.1A GB201114439A GB2493931A GB 2493931 A GB2493931 A GB 2493931A GB 201114439 A GB201114439 A GB 201114439A GB 2493931 A GB2493931 A GB 2493931A
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United Kingdom
Prior art keywords
text
ambient light
averaging
dynamic range
display device
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.)
Withdrawn
Application number
GB1114439.1A
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GB201114439D0 (en
Inventor
Michael Tusch
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Apical Ltd
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Apical Ltd
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Filing date
Publication date
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Priority to GB1114439.1A priority Critical patent/GB2493931A/en
Publication of GB201114439D0 publication Critical patent/GB201114439D0/en
Priority to KR1020147007402A priority patent/KR102076873B1/en
Priority to PCT/EP2012/066370 priority patent/WO2013026891A1/en
Priority to EP12762230.6A priority patent/EP2748809B1/en
Priority to CN201280050264.7A priority patent/CN103946917B/en
Publication of GB2493931A publication Critical patent/GB2493931A/en
Priority to US14/187,180 priority patent/US9489920B2/en
Withdrawn legal-status Critical Current

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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
    • G09G5/10—Intensity circuits
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H04N5/58—Control of contrast or brightness in dependence upon 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
    • 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
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • 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

Abstract

Controlling in a display device screen brightness and strength of dynamic range compression of display data in dependence on ambient light level. Ambient light level values are acquired from one or more ambient light sensors (11). The ambient light level values are averaged using a first method (12) (e.g. temporal average using moving window averaging) to obtain a first average value and using a second, different, method (13) (e.g. temporal averaging using recursive averaging) to obtain a second average value. The first average value is used for controlling the screen brightness (14) and the second average value is used for controlling the strength of the dynamic range compression (16).

Description

Display Device Control
Technical Field
The present invention relates to a method for controlling a display device and to a display control system for carrying out the method.
Backizround It is known to incorporate an ambient light sensor in a display device so that the ambient light sensor data can be used to modify the screen brightness or the gamma curve or a combination of these two controls. For example, patent application US 2005/68332 discloses a display device incorporating an ambient light sensor. The screen brightness is controlled by adjusting the backlight intensity of the display device based on the ambient light level. The gamma curve of the display device is modified to compensate the image colour brightness to the change in backlight.
Modification of the gamma curve is a form of dynamic range compression.
It is an object of the invention to improve the control of the screen brightness and the dynamic range compression in dependence on the ambient light level.
Summary
In accordance with embodiments according to one aspect, there is provided a method of controlling in a disp'ay device screen brightness and strength of dynamic range compression of display data in dependence on ambient light level, the method comprising the steps of: acquiring ambient light level values from one or more ambient light sensors; averaging the ambient light level values using a first method to obtain a first average value; averaging the ambient light level values using a second, different method to obtain a second average value; using the first average value for controlling the screen brightness; and using the second average value for controlling the strength of the dynamic range compression.
Embodiments are is based on the recognition that using the same way of averaging the ambient light level to control both the screen brightness and the strength of the dynamic range compression is not optimal because of the different effect that changes in screen brightness and dynamic range compression strength have on an observer of the image displayed on the display device.
Features and advantages will become apparent from the following description of preferred embodiments, given by way of example only, which is made with reference to the accompanying drawings.
Brief Description of the Drawings
Figure 1 shows a prior art display control system
Figure 2 shows a display control system according to embodiments; and Figure 3 shows a display apparatus in accordance with embodiments.
Detailed Description of Preferred Embodiments
Figure 1 shows a prior art display control system 1. An ambient light sensor 2 measures the ambient light incident on a display device and provides as output an ambient light level. An ambient light level processor 3 processes the ambient light level by a statistical method such as moving window averaging. The average value output by the ambient light level processor is input in a backlight control unit 4, which generates a signal for setting the intensity of the backlight in dependence on the average value. The signal is input to a display controller 5. The ambient light level is typically used to decrease the display brightness in dark conditions and increase its brightness in bright conditions.
The same average value output by the ambient light level processor 3 is also used as input for a video processor 6, which can alter the brightness of individual pixels of the display device in order to increase or decrease their relative brightness values independent of the overall display brightness. This type of processing is known as dynamic range compression or tone mapping; see e.g. the article Display Adaptive Tone Mapping' by R. Mantiuk et al in ACM Transactions on Graphics, Vol. 27, No. 3, Article 68 of August 2008. The average value is used in the video processor 6 to control the strength of the dynamic range compression in order to achieve a better viewing experience in changing ambient light.
A video input of the video processor 6 is processed in dependence on the average signal and a signal from the bacldight control unit 4 representing the backlight intensity. The video output of the video processor is input to the display controller 5.
The dynamic range compression adapts the content to be displayed to the contrast ratio of the display device. The contrast ratio of a display device is defined as the difference in brightness of the darkest and brightest pixels that the display device can simultaneously produce. Content to be displayed has a dynamic range determined by the difference in brightness of the darkest and brightest details within a given image or video frame. To show the content optimally, the contrast ratio of the display device should be larger than the maximal dynamic range of the content to be displayed.
The contrast ratio of a display device is reduced in the presence of ambient light compared to that in complete darkness, primarily due to reflections from the screen surface of the display device. As the ambient light level is increased, the dynamic range of the content and the contrast of the display device can be matched in two ways. Firstly, the contrast ratio of the display device can be increased by increasing the display brightness, for example by increasing the power delivered to an LED baeklight in an LCD display device or by increasing the maximum power associated with a white pixel on an OLED display device. Secondly, the dynamic range of the content can be reduced by a dynamic range compression module using one of a variety of algorithms to match the reduced contrast.
The use of the same average signal for controlling both the display brightness and the strength of the dynamic range compression is not optimal because of the different effect of changes in display brightness and dynamic range compression.
The human eye is very sensitive to changes in display brightness, such that rapid changes commonly lead to an observable flicker which is irritating to the viewer. Also, some display devices, for example those based on OLED technology, are unable to change brightness continuously and can only select discrete brightness levels. The transition between one level and the next based on ambient light must be dampened to avoid rapid switching between two discrete values. For this reason, the common techniques of moving-window time filtering and hysteresis are widely employed.
However, changes in the strength of dynamic range compression may be effccted rapidly without irritation to the viewer, especially if the dynamic range compression algorithm is locally adaptive, meaning that different processing strengths can be applied to different regions of an image or video frame, depending on its visual content. Examples of such locally adaptive algorithms arc well known; see e.g. patent US 7302110. Since the effect of ambient light on display contrast is primarily to raise thc minimum grey level, being thc darkest pixel intensity which is visible to the user, such a locally adaptive algorithm can selectively adjust only those pixels which are most affcctcd by ambient light. This implies that dynamic range compression strength can be based on the actual light level, as opposed to a longer-term average, without risk of degrading image quality if the actual light level estimation is in error or is rapidly changing.
It is therefore advantageous to use different processing of the ambient light levels for the brightness control and the dynamic range compression control and provide different estimators of ambient light. This is realised in a display control system according to the invention. Figure 2 shows an embodiment of a display control system 10 according to the invention. An ambicnt light sensor 11 measures the ambient light level. The ambient light level values are processed by a first ambient light level processor 12 and a second ambient light level processor 13, the two processors using a first and a second, different method, respectively, of processing the ambient light levels.
The first processor 12 uses a first method to form a first average value of the ambient light level values, which is input to a brightness control unit 14. An output signal of the brightness control unit 14 is input in a display controller 15, where it may be used for controlling the display brightness, for example by setting the intensity of a backlight of the display device or by setting the maximum brightness of a pixel such as in an OLED display device.
The second processor 13 uses a second method to form a second average value of the ambient light level values, which is input to a video processor 16, where it is used to set the strength of the dynamic range compression. The video output of the video processor is input to the display controller 15. Although the embodiment shown uses video input, embodiments can also be used for input of static images.
Although Figure 2 shows the ambient light level processors 12 and 13 as separate processors, they may be integrated into a single processor. The same applies to the processors used in any of the elements 12-16, two or more of which may be integrated in one processor. The processing may be carried out in hardware in a circuit or as a computer program in a digital processor.
The ambient light levels obtained from the ambient light sensor 11 can be time avcragcd, e.g. to avoid rapid changes due to incorrect mcasurcmcnts caused by for example a user covering the sensor by his hand. A common method for temporal averaging is the moving window method, which forms a time-dependent first average value AL1 over the N most recent readings L1 of the ambient light level: AL1 = N' where consecutive readings are taken at intervals of At. The value of At may be determined by the rate at which the ambient light sensor delivers data, which may range from approximately 0.015 seconds to approximately I seconds. For example At may equal to 0.1 seconds. Other methods for averaging arc also possible.
The method may be refined by establishing a reset threshold, such that if an individual reading L deviates significantly from the current average, L+1 -L1 > Lth being a predetermined threshold value, then the averaging window is reset. The method stabiliscs the variation in the control of the display device whilc allowing for a discrcte rapid change, for cxamplc if the user turns on or off room lights.
The averaging period, N At, for the brightness control may for example be 30 seconds or more. This pcriod is unnecessarily long for the purpose of controlling dynamic range compression, which is less prone to producing observable flickering to the viewer. Hence, the averaging period for controlling the dynamic range compression is shorter than for the brightness control. The former averaging period may be less than 1 second.
The method for averaging the ambient light levels may alternatively use a recursive method for forming the second average value AL2j, for example: AL2 = rL1 + (1 -r)AL2_1 where r is a recursion coefficient, which may be set to I if most rapid adaptation is desired, for example in a moving vehicle, or reduced for example to 0.25 if a smoother variation is desired. The interval At can be in the range described above, for example 0.1 seconds. The interval is preferably equal to the intewal used for determining the first average value, allowing both methods to use the same readings of the ambient light level.
In various embodiments, a moving window averaging method may be used for 1 0 the ambient light sensor data for both screen brightness control and for dynamic range control. The screen brightness control averaging method may have N set to a relatively large value, for example 300, corresponding to an averaging time of 30 seconds, and the dynamic range control averaging method may have N set to a relatively small value, e.g. a value which is less than one fifth and preferably less than one tenth of that, for example, 10, corresponding to an averaging time of 1 second.
An alternative is to use a recursive averaging method for both screen brightness control and for dynamic range control. The screen brightness control averaging method may have r set to a relatively low value, for example 0.05, and the dynamic range control averaging method may have r set to a relatively high value, e.g. a value which is more than five times and preferably more than ten times that value, for example 0.75. A further alternative is to use a moving window averaging method for screen brightness control and a recursive averaging method for dynamic range control, or vice-versa. Other averaging techniques may also be used, as will be familiar to those skilled in the art.
The ambient light sensor II may include a plurality of sensors to avoid incorrect readings due to the position of a single sensor. The first and second method may form different spatial averages over the plurality of sensors: the first method forming a first weighted average over the ambient light sensors and the second method forming a second, different weighted average over the ambient light sensors.
The first averaging method for brightness control uses preferably a spatial averaging equally over the ambient light sensors to produce a measure of diffuse ambient light. The first average value ALl can be calculated as: ALl = K_1XLI where the sum is over the ambient light values L of K sensors I. The method may be refined by excluding from the sum ambient light values of sensors that are occluded, e.g. by excluding sensors for which L<L±, where Lih is a predetermined threshold value, which preferably has a zero or near-zero value associated with an occluded sensor.
The second average value for controlling the dynamic range compression is preferably weighted heavily towards those sensors mounted on the display device itself to produce a measure of the specular component of reflection of ambient light on the screen of the display device. This enables the displayed content to respond to changes in ambient light that fall directly on the display itself The spatial averaging may include averaging over a first set of sensors in the first method and over a second set of sensors in the second method. The two sets may be overlapping or disjoint. A set may include one or more sensors.
The use of two separate and independent average values for the ambient light provides for a better visual experience of displayed content to the user and ability to produce stable visual quality under a wide range of ambient light conditions. A display control system may use either the temporal averaging or the spatial averaging or both of them. When using a plurality of ambient light sensors, different spatial averaging may be combined with equal temporal averaging and with different temporal averaging.
Figure 3 shows schematically a display apparatus 20 in accordance with embodiments including a display control system 10 in accordance with embodiments, and a display device 21. The display device, e.g. an LCD, OLED or other display device, forms an image of the content for viewing by a user.
It will be understood that the processors or processing systems referred to herein may in practice be provided by a single chip or integrated circuit or plural chips or integrated circuits, optionally provided as a chipset, an application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), etc. The chip or chips may comprise circuitry (as well as possibly firmware) for embodying at least one or more of a data processor or processors, a digital signal processor or processors, which are configurable so as to operate in accordance with the exemplary embodiments. In this regard, the exemplary embodiments may be implemented at least in part by computer software stored in memory and executable by the processor, or by hardware, or by a combination of software and/or firmware stored on a non-transitory computer-readable storage medium and hardware.
Although at least some aspects of the embodiments described herein with rcfcrcnce to the drawings comprisc computer processcs pcrformcd in processing systems or processors, the invention also extends to computer programs, particularly computer programs on or in a carrier, adapted for putting the embodiments into practice. The program may be in the form of source code, object code, a code intermediate source and object code such as in partially compiled form, or in any other form suitable for use in the implementation of the processes according to the embodiments described herein. The carrier may be any entity or device capable of carrying the program. For example, the carrier may comprise a storage medium, such as a solid-state drive (SSD) or other semiconductor-based RAM; a ROM, for example a CD ROM or a semiconductor ROIvI; a magnetic recording medium; an optical memory device; etc. The above embodiments arc to be understood as illustrative examples of the invention. Further embodiments of the invention are envisaged. It is to be understood that any feature described in relation to any one embodiment may be used alone, or in combination with other features described, and may also be used in combination with one or more features of any other of the embodiments, or any combination of any other of the embodiments. Furthermore, equivalents and modifications not described above may also be employed without departing from the scope of the invention, which is defined in the accompanying claims.

Claims (1)

  1. <claim-text>Claims 1. A method of controlling in a display device screen brightness and strength of dynamic range compression of display data in dependence on ambient light level, the method comprising the steps of: acquiring ambient light level values from one or more ambient light sensors; averaging the ambient light level values using a first method to obtain a first average value; averaging the ambient light level values using a second, different method to obtain a second average value; using the first average value for controlling the screen brightness; and using the second average value for controlling the strength of the dynamic range compression.</claim-text> <claim-text>2. A method according to claim 1, in which the first method uses a first temporal averaging and the second method uses a second, different temporal averaging.</claim-text> <claim-text>3. A method according to claim 2, in which the first temporal average is over a longer period than the second temporal average.</claim-text> <claim-text>4. A method according to claim 2 or 3, in which the first and / or second temporal averaging uses moving window averaging.</claim-text> <claim-text>5. A method according to 2, 3 or 4, in which an averaging window is reset when at least one of one or more latest acquired ambient light levels deviates from a current first or second average value by more than a predetermined threshold value.</claim-text> <claim-text>6. A method according to claim 2 or 3, in which the second temporal averaging uses recursive averaging.</claim-text> <claim-text>7. A method according to claim 1 using a plurality of ambient light sensors, in which the first method forms a first weighted average over the ambient light sensors and the second method forms a second, different weighted average over the ambient light sensors.</claim-text> <claim-text>8. A method according to claim 7, in which the first weighted average weights equally over the plurality of ambient light sensors.</claim-text> <claim-text>9. A method according to claim 7 or 8. in which the second weighted avcragc weights more hcavily towards those of the plurality of ambient light sensors that face in the same direction as a front of the display device.</claim-text> <claim-text>10. A method according to any of the preceding claims, in which the dynamic range compression is locally adaptive.</claim-text> <claim-text>11. A display control system including a processor for carrying out a method according to any one of claims Ito 10.</claim-text> <claim-text>12. A display apparatus including a display control system according to claim 11 and a display device.</claim-text> <claim-text>13. A computer program adapted to carry out a method according to any one of claims Ito 10.</claim-text> <claim-text>14. A data carrier including a computer program according to claim 13.</claim-text>
GB1114439.1A 2011-08-22 2011-08-22 Display Device Brightness and Dynamic Range Compression Control Withdrawn GB2493931A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB1114439.1A GB2493931A (en) 2011-08-22 2011-08-22 Display Device Brightness and Dynamic Range Compression Control
KR1020147007402A KR102076873B1 (en) 2011-08-22 2012-08-22 Display device control
PCT/EP2012/066370 WO2013026891A1 (en) 2011-08-22 2012-08-22 Display device control
EP12762230.6A EP2748809B1 (en) 2011-08-22 2012-08-22 Display device control
CN201280050264.7A CN103946917B (en) 2011-08-22 2012-08-22 Display device control method
US14/187,180 US9489920B2 (en) 2011-08-22 2014-02-21 Method to control display device screen brightness and strength of dynamic range compression based on ambient light level

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1114439.1A GB2493931A (en) 2011-08-22 2011-08-22 Display Device Brightness and Dynamic Range Compression Control

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GB201114439D0 GB201114439D0 (en) 2011-10-05
GB2493931A true GB2493931A (en) 2013-02-27

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GB1114439.1A Withdrawn GB2493931A (en) 2011-08-22 2011-08-22 Display Device Brightness and Dynamic Range Compression Control

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US (1) US9489920B2 (en)
EP (1) EP2748809B1 (en)
KR (1) KR102076873B1 (en)
CN (1) CN103946917B (en)
GB (1) GB2493931A (en)
WO (1) WO2013026891A1 (en)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6439418B2 (en) * 2014-03-05 2018-12-19 ソニー株式会社 Image processing apparatus, image processing method, and image display apparatus
GB201410635D0 (en) 2014-06-13 2014-07-30 Univ Bangor Improvements in and relating to the display of images
US10163408B1 (en) * 2014-09-05 2018-12-25 Pixelworks, Inc. LCD image compensation for LED backlighting
US20160110846A1 (en) * 2014-10-21 2016-04-21 Qualcomm Incorporated Automatic display image enhancement based on user's visual perception model
US10607525B2 (en) 2015-05-19 2020-03-31 Irystec Software Inc. System and method for color retargeting
CN105094616B (en) * 2015-08-12 2019-02-12 小米科技有限责任公司 Touch screen control method and device
US10520359B2 (en) 2015-09-28 2019-12-31 Huawei Technologies Co., Ltd. Terminal and method for detecting luminance of ambient light
DE102015219496A1 (en) * 2015-10-08 2017-04-13 Robert Bosch Gmbh Method for determining the functionality of a driver assistance system of a vehicle, device, driver assistance system, motor vehicle
DE102016211893A1 (en) * 2016-06-30 2018-01-04 Robert Bosch Gmbh Apparatus and method for monitoring and correcting a display of an image with surrogate image data
CN106370296B (en) * 2016-08-24 2018-07-17 Tcl移动通信科技（宁波）有限公司 The detection method and system of a kind of mobile terminal optical sensor to ambient light
US10101632B1 (en) 2017-05-22 2018-10-16 Sony Corporation Dual layer eScreen to compensate for ambient lighting
US10186178B2 (en) 2017-05-22 2019-01-22 Sony Corporation Tunable lenticular screen to control luminosity and pixel-based contrast
US10574953B2 (en) 2017-05-23 2020-02-25 Sony Corporation Transparent glass of polymer window pane as a projector screen
US10613428B2 (en) 2017-05-30 2020-04-07 Sony Corporation Wallpaper-based lenticular projection screen
US10446114B2 (en) 2017-06-01 2019-10-15 Qualcomm Incorporated Adjusting color palettes used for displaying images on a display device based on ambient light levels
US10429727B2 (en) 2017-06-06 2019-10-01 Sony Corporation Microfaceted projection screen
US10798331B2 (en) 2017-07-21 2020-10-06 Sony Corporation Multichromic reflective layer to enhance screen gain
US10795252B2 (en) 2017-07-21 2020-10-06 Sony Corporation Multichromic filtering layer to enhance screen gain
US10634988B2 (en) 2017-08-01 2020-04-28 Sony Corporation Tile-based lenticular projection screen
KR20190019676A (en) * 2017-08-18 2019-02-27 삼성전자주식회사 Electronic device for acquiring biometric data using display light and operating method thereof
CN108021161A (en) * 2017-11-22 2018-05-11 广东欧珀移动通信有限公司 Ambient light intensity detection method, device, storage medium and electronic equipment
CN108549194A (en) * 2018-06-01 2018-09-18 深圳安麦思科技有限公司 The control method and crystal projection screen of crystal projection screen
CN108924347B (en) * 2018-06-27 2021-05-11 Oppo广东移动通信有限公司 Control method, control device, electronic device, storage medium, and computer apparatus
US11211018B1 (en) * 2020-06-25 2021-12-28 Xianyang Caihong Optoelectronics Technology Co., Ltd Grayscale compensation method and apparatus of display device
CN114495862A (en) * 2022-01-24 2022-05-13 上海闻泰信息技术有限公司 Method for acquiring ambient light sensitivity value, electronic device and computer readable storage medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006119200A (en) * 2004-10-19 2006-05-11 Fujitsu General Ltd Image display apparatus
EP1959419A2 (en) * 2007-02-15 2008-08-20 Samsung Electronics Co., Ltd. Driving method and driving apparatus of liquid crystal display

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4090216A (en) 1976-05-26 1978-05-16 Gte Sylvania Incorporated Ambient light contrast and color control circuit
DE3510362A1 (en) 1985-03-22 1986-09-25 Basf Ag, 6700 Ludwigshafen PHYSICALLY DRYING CORROSION PROTECTIVE INKS AND METHOD FOR THE PRODUCTION THEREOF
US5760760A (en) 1995-07-17 1998-06-02 Dell Usa, L.P. Intelligent LCD brightness control system
US6411306B1 (en) * 1997-11-14 2002-06-25 Eastman Kodak Company Automatic luminance and contrast adustment for display device
GB0110748D0 (en) 2001-05-02 2001-06-27 Apical Ltd Image enhancement methods and apparatus therefor
KR100725684B1 (en) 2001-06-22 2007-06-07 엘지전자 주식회사 Apparatus and method for controlling a back light in LCD
US20050057484A1 (en) 2003-09-15 2005-03-17 Diefenbaugh Paul S. Automatic image luminance control with backlight adjustment
US7259769B2 (en) * 2003-09-29 2007-08-21 Intel Corporation Dynamic backlight and image adjustment using gamma correction
US20050212824A1 (en) * 2004-03-25 2005-09-29 Marcinkiewicz Walter M Dynamic display control of a portable electronic device display
US8103118B2 (en) * 2004-12-21 2012-01-24 Motorola Mobility, Inc. Electronic device with optoelectronic input/output compensation function for a display
EP1696414A1 (en) 2005-02-28 2006-08-30 Research In Motion Limited Backlight control for a portable computing device
JP2006285064A (en) * 2005-04-04 2006-10-19 Matsushita Electric Ind Co Ltd Image display apparatus
US20090167791A1 (en) 2005-11-25 2009-07-02 Makoto Shiomi Image Display Method, Image Display Device, Image Display Monitor, and Television Receiver
JP2009519486A (en) * 2005-12-13 2009-05-14 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Display device with ambient light detection
CN100515096C (en) * 2005-12-31 2009-07-15 财团法人工业技术研究院 Method and device for digital image adaptative color adjustment of display
US8698727B2 (en) * 2007-01-05 2014-04-15 Apple Inc. Backlight and ambient light sensor system
US8610659B2 (en) * 2008-05-12 2013-12-17 Blackberry Limited Method and apparatus for automatic brightness adjustment on a display of a mobile electronic device
US9230484B2 (en) 2008-09-03 2016-01-05 Ati Technologies Ulc Adaptive backlight control and contrast enhancement
WO2011033669A1 (en) * 2009-09-18 2011-03-24 株式会社 東芝 Image display device
CN101908330B (en) * 2010-07-26 2012-05-02 武汉大学 Method for display equipment with narrow dynamic range to reproduce image with wide dynamic range
US20120182278A1 (en) * 2011-01-17 2012-07-19 Dolby Laboratories Licensing Corporation Methods and Apparatus for Estimating Light Adaptation Levels of Persons Viewing Displays

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006119200A (en) * 2004-10-19 2006-05-11 Fujitsu General Ltd Image display apparatus
EP1959419A2 (en) * 2007-02-15 2008-08-20 Samsung Electronics Co., Ltd. Driving method and driving apparatus of liquid crystal display

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