GB2403096A - Automatic lighting control for communication devices with a camera - Google Patents
Automatic lighting control for communication devices with a camera Download PDFInfo
- Publication number
- GB2403096A GB2403096A GB0313085A GB0313085A GB2403096A GB 2403096 A GB2403096 A GB 2403096A GB 0313085 A GB0313085 A GB 0313085A GB 0313085 A GB0313085 A GB 0313085A GB 2403096 A GB2403096 A GB 2403096A
- Authority
- GB
- United Kingdom
- Prior art keywords
- values
- camera
- communication device
- ambient
- illumination
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
-
- 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
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M2250/00—Details of telephonic subscriber devices
- H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
- H04W52/0267—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level by controlling user interface components
-
- 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
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Telephone Function (AREA)
Abstract
An automatic lighting control system for communication devices with a camera <B>3</B> where the ambient light levels detected by the camera <B>3</B> are used to adjust the brightness of the user interfaces, e.g. display <B>4</B> and keypad <B>2</B>. The system contains a monitor circuit <B>22</B> which activates and obtains ambient light level values from the camera <B>3</B> at a frequency dependent on the rate of change of ambient light.
Description
Automatic lighting control for communication devices This invention
relates to electronic communication devices and in particular, it relates to such devices with a camera and the control of user interface illumination for these devices by utilising the ambient light level output from the camera.
Electronic communication devices usually require displays, keyboards and other user interfaces to be illuminated. The illumination provided supplements ambient light. In the right ambient lighting conditions very little or no additional lighting needs to be provided by the device. The power for operation of electronic devices when not connected to a mains supply is limited and in most cases is provided by a battery. Light sources in these devices consume a relatively large amount of power and therefore reduce the operational capacity of the devices.
Reduction of the power consumption of light sources in hand-held electronic devices has been the subject of many disclosures of the prior art.
The prior art may be accessed through EP 1 227 642 and GB 2 365 691.
Other factors in the provision of device illumination are cost and user perception.
Designers of electronic communication devices seek continually to reduce the cost of production. A portion of the production cost of electronic units is vested in the component parts and a portion of the cost attaches to the interconnections between these component parts. The amount of assembly work and testing contributing to the overall cost will also depend upon the number of components.
Where the functions of a particular component can be supplanted, by other elements already necessary to a design, then cost savings are available. If the use of other elements results also in an increased performance compared with the supplanted component then a significant improvement to the design will have been achieved.
The implementation of automatic brightness controls of user interfaces in the prior art depends upon the use of a dedicated ambient light sensor such as a photodiode. An alternative would be to use an already present camera to provide the required ambient light level information. This solution does
not appear in the prior art.
Automatic brightness controls have many advantages but one disadvantage is that brightness levels of user interfaces suitable for one user will not necessarily be suitable for another user. There is a need therefore to modify the brightness levels provided automatically, to conform to a particular user's requirements. This would be achieved by offering the user the option to set the automatic brightness levels higher or lower than the default, for example via one of the user interfaces.
There may also be reasons (of the user's choice or of necessity for the correct operation of the device) to disable the automatic brightness controls of the user interfaces. Provision of the option to disable the device by the user and by a control signal from the other parts of the device could be provided.
In accordance with the invention there is provided an electronic communication device with a display and a camera, characterized by; a monitoring circuit for obtaining values from the camera relating to the ambient illumination incident upon a camera and means for setting user interface lighting in accordance with the values obtained.
An embodiment of the invention will now be described with reference to the accompanying figures in which: Figure l is a view of a mobile phone, incorporating a camera.
Figure 2 is a block diagram illustrating the overall operation of the invention.
Figure 3 is a block diagram showing the operation of the monitoring function of the automatic brightness control of the user interfaces.
A view of a mobile phone incorporating a camera is shown in figure l with the mobile phone shown generally at 1. The mobile phone operates under the control of a central processing unit (CPU) in accordance with programs and parameters stored in memory. In this mobile phone there is a camera mounted at 3. However, the camera could be mounted in a different position and could additionally be mounted in such a way that one or both of its position and orientation are adjustable. The user interface elements are the keypad 2 and display 4. The light sources referred to herein illuminate the keypad 2 and display 4 although the illumination of other user interfaces could also be controlled, for example a touch pad or biometric sensor such as a thumb print reader.
The block diagram of figure 2 shows the basic components in the implementation of the invention. The camera unit 3 is of standard type such as a CMOS CIF image sensor as is available from a number of component suppliers. Ambient illumination values available from this type camera may be restricted to the average linear illumination level incident upon the camera over a range, represented as an 8-bit number. Cameras with larger ranges would also be suitable but the range of this type of camera is sufficient.
Monitor 22 is explained in more detail below with reference to figure 3.
Driver circuit 23 may be of standard form as is well known in the art.
Alternatively, the driver circuit disclosed in our co-pending application GB0124865.7 would be suitable for use with the invention. Block 24 represents the light sources for the keypad 2 and display 4. These may be, for example, light emitting diodes (LED's).
The monitoring circuit is illustrated in figure 3 and has a counter 31 set to produce an output to trigger the activate block 32. The setting of counter 31 will depend upon various factors to be described. On start-up of the ambient light monitoring circuit, counter 31 will signal camera activation relatively frequently but the frequency of activation will be reduced where possible by the compare block 36 as described below.
On receipt of a signal from counter 31, block 32 will switch on camera 3 (or at least the parts of the camera necessary to provide ambient light level measurements). Under certain conditions, activation block 32 will be inhibited from switching on the camera 3. These conditions relate to the configuration and operating state of the device. Such a condition is where there is insufficient processing capacity.
After a delay to allow the camera 3 to reach the operational state necessary to provide good measurements, the activate block 32 signals the poll block 33 to retrieve the values relating to ambient illumination stored within the camera 3. These camera illumination values are passed to the level block 34 where the most suitable level of illumination for the light sources is determined as described below. In this embodiment a pulsewidth- modulated (PWM) drive signal is used for the light sources. The PWM drive levels to produce the most suitable light source levels to complement existing ambient illumination are set at block 35 and generated by the driver circuit 23 in a manner also described below.
Table l comprises a look-up table that might be used by the level block 34.
The table shows four ambient illumination levels set against two columns of outputs. In this instance, the outputs are the illumination requirements for the display 4 and the keypad 2. These figures indicate the degree of illumination required as a percentage of the maximum possible illumination. The parameters in this table would be defined during the design of the mobile phone. The illumination requirements for the two outputs differ but both are contingent upon the measured ambient illumination levels. For example, under very high illumination levels, the keypad 2 would not need to be illuminated as it would be perfectly visible but the display 4 may need maximum illumination to preserve the colours of the displayed image.
TABLE 1.
AMBIENT DISPLAY KEYPAD
ILLUMINATION LEVEL ILLUMINATION ILLUMINATION
Very Low 10% 20% l Medium 50% 50% High 80% 10% Very High 1 100% 0% In this example, as stated, PWM drive signals are used where the frequency I of the driving pulses from the driver circuit 23 remains constant and the light output is governed in level simply by the variation in the ratio of the I on to the off part of the pulses (the duty cycle of the pulses).
The ambient illumination values obtained from the camera are also passed from block 34 to the compare block 36 and stored. A comparison of the I latest measurements with past measurements is made in 36. This comparison determines whether or not the ambient illumination has altered, significantly from the previous reading(s). If the ambient illumination has I altered significantly then a more rapid variation in the levels of the user interfaces light sources might well be necessary. The output from block 36 then sets the counter 31 to trigger camera activation with a higher frequency.
Conversely, if the ambient illumination has not altered significantly or at all over a recent period then the modification of the levels of the user interfaces light sources is not likely to be necessary in the near future and the frequency of camera activation is reduced by the compare block 36.
From a series of previous readings stored at 36, the rate of change of ambient illumination measurements will continue to be determined and the frequency of camera activation set accordingly. The usefulness of the comparison will cease when the phone has been switched off. For this reasons the compare block 36 will clear the registers at switch off of the ambient light monitoring circuit. Upon switch on of the monitoring circuit, comparisons will only be possible after the second ambient illumination value has been obtained. For this reason the frequency of camera activation will be set high at switch on as previously stated.
Where measurements of flicker in the ambient light are available, this could be used by the level block 34 to identify the type of the light sources so as to be able to apply a known colour compensation for that type of light source. Measurements of the character of the flicker could also be used to compensate for the flicker by adjusting the brightness of the illumination of the user interfaces in time with the flicker.
The brightness of the user interface illumination versus ambient illumination levels is set in the first instance to suit the perceptions of an average user. These settings would be contained in a look up table, an example of which has already been described with reference to table 1. As is usual, additional control of the illumination of the user interface is available to the user via keys on the keypad. This allows the user to apply some adjustment to the default brightness settings to reflect their personal preference. This can be achieved by providing an option in the menu that sets the brightness of the user interfaces illumination higher or lower than the default level as required by the user. The settings chosen by the user would result in temporary offsets being applied to the values in the lookup table. These values as modified by the offsets would then be used by the level block 34 to set user interface brightness settings that better meet the individual user's preference. This setting and the corresponding offsets will remain until further adjustment is made by the user. In this way the light source brightness levels to supplement ambient lighting are most suitable for the individual user. In addition, this feature compensates for the effect of reductions in performance or defects in the light sources.
Under certain conditions automatic brightness control of one or more of the user interfaces may not be desirable to the user or may even be disadvantageous to the operation of the phone. An example of such a condition is when the image displayed on the LCD display is that currently being produced by the camera of the phone. In this situation, the brightness of the display should be fixed so that the user perceives the true brightness of the image provided by the camera.
Some light sources are susceptible to temperature in that their performance is reduced at low temperatures. Where suitable temperature information is available within the device, the driver circuit may be boosted at low temperature to compensate for the reduced performance.
As an optional enhancement to the previous embodiment, where a secondary ambient light detector is available on an electronic device the output of the secondary detector may be used to advantage. The US patent number 5 337 073 for example teaches the use of an electroluminescent lamp to sense ambient illumination as well as providing illumination. If a beam of light falls upon the camera in an otherwise darkened environment then the values derived from the camera will demand levels of illumination of the user interfaces light sources that are not appropriate. Alternatively, if the camera aperture is obscured in a brightly lighted environment, levels of illumination of the user interfaces light sources that are equally inappropriate will be demanded. To reduce the occurrence of problems of this sort, a correspondence check is implemented and fail- safe lighting levels provided when necessary. When both detectors indicate the same ambient brightness levels within a threshold, then the standard automatic brightness control is operated. If the correspondence between the detectors is beyond the threshold, however, then fail-safe lighting levels of say three- quarters of the maximum level, in the case of an LCD display, is provided.
Claims (10)
1. A communication device with a camera characterized by; a monitoring circuit for obtaining values from the camera relating to the ambient illumination incident upon the camera and means for setting user interface lighting for the device in accordance with the values obtained.
2. A communication device as in claim 1 in which the values from the; camera relating to the ambient illumination levels are obtained intermittently.
3. A communication device as in claim 2 in which the intermittence is varied in accordance with the result of a comparison of current values with previous values. I
4. A communication device as in claim I where the values are related to the average ambient illumination level.
5. A communication device as in any preceding claim where the user has the option to modify the pre-defined automatic user interface illumination levels to suit their personal preference.
6. A communication device as in claim 1 where the values are related to flicker in the ambient illumination level.
7. A communication device as in claim 1 where the values are related to the colour temperature of the ambient illumination level.
8. A communication device as in claim 1 where the output from one or more additional ambient light detectors is used by the monitoring circuit to perform a correspondence check to detect if any of the obtained values are likely to be the result of false readings.
9. A communication device as in claim that makes use of fail safe lighting levels in the case that the correspondence check detects that one of the obtained values are likely to be the result of false readings.
10. A communication device as in claim 1 where the monitoring circuit takes into account information on the predicted temperature of the light sources to compensate for changes in performance of the sources due to temperature by adjusting the drive signal to the light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0313085A GB2403096B (en) | 2003-06-07 | 2003-06-07 | Automatic lighting control for communication devices with a camera. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0313085A GB2403096B (en) | 2003-06-07 | 2003-06-07 | Automatic lighting control for communication devices with a camera. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB0313085D0 GB0313085D0 (en) | 2003-07-09 |
| GB2403096A true GB2403096A (en) | 2004-12-22 |
| GB2403096B GB2403096B (en) | 2005-09-21 |
Family
ID=9959489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0313085A Expired - Fee Related GB2403096B (en) | 2003-06-07 | 2003-06-07 | Automatic lighting control for communication devices with a camera. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2403096B (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006128700A1 (en) * | 2005-06-01 | 2006-12-07 | Sony Ericsson Mobile Communications Ab | Portable electronic device with operational interface controlled by a proximity sensor |
| EP1732059A1 (en) | 2005-06-09 | 2006-12-13 | Samsung Electronics Co., Ltd. | Portable terminal capable of controlling backlight and corresponding method |
| WO2008048601A1 (en) | 2006-10-17 | 2008-04-24 | Marvell World Trade Ltd. | Display control for cellular phone |
| US7447425B2 (en) | 2005-06-07 | 2008-11-04 | Samsung Electronics Co., Ltd. | Method of zooming image in wireless terminal and wireless terminal implementing the same |
| US7486304B2 (en) | 2005-12-21 | 2009-02-03 | Nokia Corporation | Display device with dynamic color gamut |
| EP2043081A2 (en) | 2007-09-27 | 2009-04-01 | TPO Displays Corp. | Display devices with ambient light sensing |
| WO2009101487A1 (en) * | 2008-02-13 | 2009-08-20 | Freescale Semiconductor, Inc. | Reducing power consumption in a portable electronic device with a luminescent element |
| EP2278579A3 (en) * | 2009-07-13 | 2012-02-29 | Samsung Electronics Co., Ltd. | Apparatus for and method of controlling backlight of display panel in camera system |
| US8653578B2 (en) | 2008-09-24 | 2014-02-18 | Samsung Electronics Co., Ltd. | Semiconductor device comprising string structures formed on active region |
| EP3358559A3 (en) * | 2017-02-03 | 2018-09-26 | Samsung Electronics Co., Ltd. | Electronic device and method for preventing current consumption by electronic device |
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2003
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006128700A1 (en) * | 2005-06-01 | 2006-12-07 | Sony Ericsson Mobile Communications Ab | Portable electronic device with operational interface controlled by a proximity sensor |
| US7447425B2 (en) | 2005-06-07 | 2008-11-04 | Samsung Electronics Co., Ltd. | Method of zooming image in wireless terminal and wireless terminal implementing the same |
| EP3968317A1 (en) * | 2005-06-09 | 2022-03-16 | Samsung Electronics Co., Ltd. | Portable terminal capable of controlling backlight and method for controlling backlight thereof |
| EP1732059A1 (en) | 2005-06-09 | 2006-12-13 | Samsung Electronics Co., Ltd. | Portable terminal capable of controlling backlight and corresponding method |
| US9318074B2 (en) | 2005-06-09 | 2016-04-19 | Samsung Electronics Co., Ltd. | Portable terminal capable of controlling backlight and method for controlling backlight thereof |
| US9548041B2 (en) | 2005-06-09 | 2017-01-17 | Samsung Electronics Co., Ltd | Portable terminal capable of controlling display brightness and method for controlling display brightness thereof |
| EP3211633A1 (en) * | 2005-06-09 | 2017-08-30 | Samsung Electronics Co., Ltd | Portable terminal capable of controlling backlight and method for controlling backlight thereof |
| US10186233B2 (en) | 2005-06-09 | 2019-01-22 | Samsung Electronics Co., Ltd | Portable terminal capable of controlling display brightness and method for controlling display brightness thereof |
| US10978021B2 (en) | 2005-06-09 | 2021-04-13 | Samsung Electronics Co., Ltd | Portable terminal capable of controlling display brightness and method for controlling display brightness thereof |
| US7486304B2 (en) | 2005-12-21 | 2009-02-03 | Nokia Corporation | Display device with dynamic color gamut |
| US7797024B2 (en) | 2006-10-17 | 2010-09-14 | Marvell World Trade Ltd. | Display control for cellular phone |
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| WO2008048601A1 (en) | 2006-10-17 | 2008-04-24 | Marvell World Trade Ltd. | Display control for cellular phone |
| US8076857B2 (en) | 2007-09-27 | 2011-12-13 | Chimei Innolux Corporation | Display devices with ambient light sensing |
| EP2043081A3 (en) * | 2007-09-27 | 2010-04-14 | TPO Displays Corp. | Display devices with ambient light sensing |
| EP2043081A2 (en) | 2007-09-27 | 2009-04-01 | TPO Displays Corp. | Display devices with ambient light sensing |
| WO2009101487A1 (en) * | 2008-02-13 | 2009-08-20 | Freescale Semiconductor, Inc. | Reducing power consumption in a portable electronic device with a luminescent element |
| US20100315535A1 (en) * | 2008-02-13 | 2010-12-16 | Freescale Semicunductor, Inc. | Reducing power consumption in a portable electronic device with a luminescent element |
| US8653578B2 (en) | 2008-09-24 | 2014-02-18 | Samsung Electronics Co., Ltd. | Semiconductor device comprising string structures formed on active region |
| US8462101B2 (en) | 2009-07-13 | 2013-06-11 | Samsung Electronics Co., Ltd. | Apparatus for and method of controlling backlight of display panel in camera system |
| EP2278579A3 (en) * | 2009-07-13 | 2012-02-29 | Samsung Electronics Co., Ltd. | Apparatus for and method of controlling backlight of display panel in camera system |
| EP3358559A3 (en) * | 2017-02-03 | 2018-09-26 | Samsung Electronics Co., Ltd. | Electronic device and method for preventing current consumption by electronic device |
| US10573270B2 (en) | 2017-02-03 | 2020-02-25 | Samsung Electronics Co., Ltd. | Electronic device and method for preventing current consumption by electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2403096B (en) | 2005-09-21 |
| GB0313085D0 (en) | 2003-07-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20080607 |