CN101763838B - Backlight module and method for setting drive current thereof - Google Patents
Backlight module and method for setting drive current thereof Download PDFInfo
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- CN101763838B CN101763838B CN 201010000693 CN201010000693A CN101763838B CN 101763838 B CN101763838 B CN 101763838B CN 201010000693 CN201010000693 CN 201010000693 CN 201010000693 A CN201010000693 A CN 201010000693A CN 101763838 B CN101763838 B CN 101763838B
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Abstract
The invention discloses a method for setting drive current of a backlight module. The method comprises the following steps of: mounting the backlight module on a base; defining a plurality of areas from the top to the bottom of the backlight module; and reducing the drive current of an area having a longer distance with the base. In the embodiment of the invention, the conduction time of control signals of the drive current or the pulse width modulation of all areas of light emitting diodes is optimally set through the characteristic of area regulation and control of the drive current of the light emitting diodes so as to greatly improve the overall performance of the light emitting diodes. In addition, the embodiment also provides the backlight module with a temperature sensor, thus a driver can adjust the drive current of the backlight module in real time according to temperature signals measured by the temperature sensor so as to ensure that operation temperatures of the light emitting diodes in all the areas are approaching.
Description
Technical field
The present invention relates to a kind of method of setting the drive current of backlight module, relate in particular to a kind of drive current of each block of setting backlight module with the method for the temperature of homogenising backlight module.
Background technology
Liquid crystal display becomes the main flow of present monitor market gradually because it has the advantages such as high image quality, radiationless and high spatial utilization ratio, low consumpting power.Because liquid crystal molecule itself can be not luminous, so liquid crystal display must by backlight module to provide liquid crystal panel required light source, make liquid crystal panel reach the effect of demonstration.
General backlight module comprises light-emitting component and driver, and wherein driver comprises the electronic components such as power crystal, transformer, can produce high heat during running, in addition, also can produce heat when light-emitting component is luminous, and these two kinds of thermals source can cause the temperature of backlight module to rise.And a spacing being arranged as the use in mixed light space between backlight module internal illumination element and liquid crystal panel, the heat that backlight module inside produces spacing thus produces cross-ventilation.After below, backlight module inside air is subject to the heat heating of light-emitting component and peripheral driver generation, having produced thermal convection because hot-air density is low up moves, in the process that moves up, can little by little accumulate heat because of above lamp box enclose inside framework, and produce the phenomenon of the inner upper and lower temperature difference of backlight module.The heat energy of these accumulations will affect light-emitting component and the driver heat sinking function in backlight module, and then affect the luminescence efficiency of backlight module.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of measuring temp of the liquid crystal display of prior art.Liquid crystal display 100 comprises backlight module 110 and base 120.Take the backlight module 110 of straight-down negative light emitting diode as example, light emitting diode is distributed in the light-emitting area downside of backlight module 110, when liquid crystal display 100 is used normally perpendicular to ground, backlight module 110 is installed on base 120, when backlight module 110 is upright owing to being subject to cross-ventilated impact, make the temperature of backlight module 110 each regional light emitting diodes produce difference, maximum temperature difference may be up to more than tens of degree.This temperature variation will have a strong impact on the operation lifetime (lifetime) of each regional light emitting diode, and the operating current of light emitting diode often is subject to highest temperature place under general homogeneous current practice condition.Because each regional lamp box temperature contrast will make blooming, the situation of expansion is arranged, and easily produce the phenomenon of wave on blooming, will affect the quality of picture.In addition, after using for a long time, the even value of the brightness of backlight module 110 also can be subject to the different generation of each regional light emitting diode rate of decay significant change, has had a strong impact on equally the quality of backlight module 110.
Summary of the invention
Therefore, a purpose of the present invention is a kind of backlight module is provided and sets its drive current method.
The invention provides a kind of method of setting the drive current of backlight module, comprise: a backlight module is upright, define a plurality of zones to the below by the top of this backlight module; And the drive current in zone that reduces the top of this backlight module.
The present invention separately provides a kind of method of setting the drive current of backlight module, comprises: define a plurality of zones at a backlight module; In these a plurality of zones, one temperature-sensitive sticker is installed respectively; And the drive current of adjusting these a plurality of zones according to the temperature that this temperature-sensitive sticker measures.
The present invention separately provides a kind of backlight module, comprises a light emitting module, a plurality of temperature-sensitive sticker and a driver.This light emitting module comprises a plurality of light-emitting zones.These a plurality of temperature-sensitive stickers are installed on respectively near these a plurality of light-emitting zones, are used for measuring the temperature of these a plurality of light-emitting zones.This driver electrically is connected in this light emitting module and this a plurality of temperature-sensitive stickers, be used for producing drive current driving this light emitting module, and the temperature that temperature-sensitive sticker a plurality of according to this measures is adjusted this drive current.
In an embodiment of the present invention, but the characteristic of the drive current regional control by light emitting diode, in advance the ON time of the control signal of each regional drive current of light emitting diode or pulse width modulation is carried out optimal setting, significantly improve the general performance of backlight module.In addition, the embodiment of the present invention provides the backlight module with temperature-sensitive sticker, and so driver can be adjusted the drive current of backlight module immediately according to the temperature signal that temperature-sensitive sticker measures, and makes the operating temperature of each regional light emitting diode close.
Description of drawings
Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, does not consist of limitation of the invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of measuring temp of the backlight module of prior art;
Fig. 2 is the schematic diagram of the method for the present invention's drive current of setting backlight module;
Fig. 3 is the schematic diagram of the first embodiment of the present invention's drive current of setting backlight module;
Fig. 4 is the schematic diagram of the second embodiment of the present invention's drive current of setting backlight module;
Fig. 5 is the schematic diagram of the 3rd embodiment of the present invention's drive current of setting backlight module;
Fig. 6 is the schematic diagram of the 4th embodiment of the present invention's drive current of setting backlight module;
Fig. 7 is the schematic diagram of the 5th embodiment of the present invention's drive current of setting backlight module.
Drawing reference numeral:
100,200 liquid crystal display
110,210,600,700 backlight modules
300,400,500 drive currents are set
120,220 bases
610 light-emitting diode (LED) modules
710 light emitting modules
720 temperature-sensitive stickers
730 drivers
740 comparers
The Vref reference voltage
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further details.At this, illustrative examples of the present invention and explanation thereof are used for explanation the present invention, but not as a limitation of the invention.
Please refer to Fig. 2, Fig. 2 is the schematic diagram of the method for the present invention's drive current of setting backlight module.Liquid crystal display 200 comprises backlight module 210 and base 220.Backlight module 210 is installed on base 220, when backlight module 210 is upright, defines a plurality of regional A～C along vertical direction to the below by the top of backlight module 210, and wherein regional A and base 220 is distant, the close together of regional C and base 220.A plurality of blocks of each district inclusion, wherein regional A comprises block A1～A3, and regional B comprises block B1～B3, and regional C comprises block C1～C3.Backlight module 210 is by light emitting diode (light-emitting diode, LED) form with several pieces bloomings, but the characteristic that has regional control (local dimming) due to the drive current of backlight module 210, therefore, the drive current of the preparation area piece by adjusting backlight module 210, make the operating temperature of the light emitting diode in each block close, so can significantly promote the general performance of backlight module 210.In each following embodiment, method that will exposed installation is decided the drive current of backlight module 210 with the defined block of Fig. 2.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of the first embodiment of the present invention's drive current of setting backlight module.In the first embodiment, the drive current of backlight module 210 is adjusted according to each zone and the distance of base 220.Due to backlight module 210 hot air rising when upright, so higher with the temperature in base 220 distant zone.Therefore, should reduce drive current with the distant zone of base 220 when setting the drive current of backlight module 210.In other words, drive current can be by promoting to the zone with base 220 close together with base 220 distant zone.For instance, the drive current of supposing regional A is benchmark, and the drive current of regional B promotes 25%, and the drive current of regional C promotes 40%, and the block that each zone comprises also can remake 10% trace adjustment.Set as shown in the of 300 as the drive current of Fig. 3, take the drive current 55mA of block A2 as 100%, the drive current 60mA of block A1, A3 is 109%, the drive current 70mA of block B2 is 127%, the drive current 68mA of block B1, B3 is 124%, the drive current 80mA of block C2 is 145%, and the drive current 75mA of block C1, C3 is 136%.Backlight module 210 is set after 300 according to the drive current of Fig. 3, measure temperature and the brightness of each block of backlight module 210, wherein maximum temperature difference is 7.2 ℃, and it is 1.24 that brightness evenly is worth (high-high brightness/minimum brightness), and maximum temperature difference has significantly compared to prior art to be improved.
Please refer to Fig. 4, Fig. 4 is the schematic diagram of the second embodiment of the present invention's drive current of setting backlight module.In a second embodiment, method and first embodiment of the drive current of each block of setting backlight module 210 are similar, but further consider the design with the local luminance raising in center and power saving.For instance, the drive current of supposing regional A is benchmark, and the drive current of regional B promotes 25%, and the drive current of regional C promotes 25%, and the block that each zone comprises also can remake 10% adjustment.Set as shown in the of 400 as the drive current of Fig. 4, take the drive current 55mA of block A2 as 100%, the drive current 60mA of block A1, A3 is 109%, the drive current 72mA of block B2 is 130%, the drive current 66mA of block B1, B3 is 120%, and the drive current 70mA of block C1, C2, C3 is 127%.Backlight module 210 is set after 400 according to the drive current of Fig. 4, measure temperature and the brightness of each block of backlight module 210, wherein maximum temperature difference is 6.1 ℃, it is 1.24 that brightness evenly is worth (high-high brightness/minimum brightness), and block B2 has obvious lifting compared to the brightness of block on every side, and compared to the next power saving (C1～C3 electric current is lower) of the first embodiment.
Please refer to Fig. 5, Fig. 5 is the schematic diagram of the 3rd embodiment of the present invention's drive current of setting backlight module.Because general light emitting diode can utilize pulse width modulation (pulse widthmodulation in brilliance control, PWM) mode is controlled, adjust the driving power of each block of backlight module 210 so utilize the ON time ratio of the control signal of setting pulse width modulation in the 3rd embodiment, on the other hand, each block of backlight module 210 still can carry out regional control in the ON time of setting.For instance, suppose that each regional drive current is identical, the ON time of the control signal by the chopped pulse width modulation is adjusted each regional light-emitting component consumed power of backlight module 210, so regional A reduces by 20% ON time, B, C are constant in the zone, and the block that each zone comprises also can remake 10% adjustment.Set as shown in the of 500 as the drive current of Fig. 5, take with the local luminance raising in center as example, the drive current of each block is all 75mA, the ON time of block A2 is 77%, the ON time of block A1, A3 is 80%, the ON time of block B2 is 100%, and the ON time of block B1, B3 is 87%, and the ON time of block C1, C2, C3 is 96%.Backlight module 210 is set after 500 according to the drive current of Fig. 5, measures temperature and the brightness of each block of backlight module, and wherein maximum temperature difference is 6.1 ℃, and it is 1.24 that brightness evenly is worth (high-high brightness/minimum brightness).
Please refer to Fig. 6, Fig. 6 is the schematic diagram of the 4th embodiment of the present invention's drive current of setting backlight module.In the 4th embodiment, for the circuit control mode of simplifying light emitting diode and keep respectively distinguishing electric current and differ, in the situation that the multi-region light emitting diode is connected in parallel, the quantity of the light emitting diode that is connected in series when each district is the more the time, and drive current can descend.Therefore, the quantity of the light emitting diode that is connected in series by each block of controlling backlight module also can reach the purpose of the drive current of adjusting each block.In addition, when being connected to resistance the light emitting diode that each block is connected in series, easier trace is adjusted the drive current of each block, and has the effect of voltage stabilizing when light emitting diode is subjected to thermal distortion.as shown in Figure 6, backlight module 600 comprises block A1～A3, B1～B3, C1～C3, in the situation that do not adjust the drive current (shown in dotted line) of each block, each block is connected in series respectively 15 light-emitting diode (LED) modules 610, suppose to reach the ratio that is similar to the drive current that sets in the second embodiment, block A1, A3 is connected in series respectively 16 light-emitting diode (LED) modules 610, block A2 is connected in series 18 light-emitting diode (LED) modules 610, block B1, B3 is connected in series respectively 15 light-emitting diode (LED) modules 610, block B2 is connected in series 13 light-emitting diode (LED) modules 610, block C1, C2, C3 is connected in series respectively 14 light-emitting diode (LED) modules 610, and can be before each distinguishes circuit of LED or the rear end add that a resistance is as the use of accent.
Please refer to Fig. 7, Fig. 7 is the schematic diagram of the 5th embodiment of the present invention's drive current of setting backlight module.The drive current of each block by presetting backlight module in first to fourth embodiment is with the temperature of homogenising backlight module and the brightness of optimization backlight module.In the 5th embodiment, backlight module 700 comprises light emitting module 710, temperature-sensitive sticker 720 and driver 730.Light emitting module 710 is comprised of light emitting diode, but the characteristic with regional control, light emitting module 710 comprises a plurality of blocks, the temperature-sensitive sticker 720 of installation is all arranged near each block, the feedback signal that each temperature-sensitive sticker 720 produces will utilize comparer 740 and reference voltage Vref to compare to calculate the present temperature value of light-emitting component, and calculate and respectively distinguish suitable current value, then controlled according to this drive current or the PWM conducting ratio value in each district by driver 730.For example, when the temperature that measures when temperature-sensitive sticker 720 rises, driver 730 can reduce drive current or the PWM ON time ratio of corresponding block, and the temperature that measures of the temperature-sensitive sticker 720 of each block is close at last, operates in most suitable temperature to keep each regional light emitting diode.
In sum, the invention provides the method for the drive current of a kind of setting one backlight module, comprise: this backlight module is installed on a base; Top by this backlight module defines a plurality of zones to the below; And reduce and the drive current in the zone that this base is distant.In an embodiment of the present invention, but the characteristic of the drive current regional control by light emitting diode, in advance the ON time of the control signal of each regional drive current of light emitting diode or pulse width modulation is carried out optimal setting, significantly improve the general performance of backlight module.In addition, embodiments of the invention also provide the backlight module with temperature-sensitive sticker, and so driver can be adjusted the drive current of backlight module immediately according to the temperature signal that temperature-sensitive sticker measures, and makes the operating temperature of each regional light emitting diode close.
The above is only preferred embodiment of the present invention, and all equalizations of doing according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (13)
1. a method of setting the drive current of backlight module, is characterized in that, described method comprises:
One backlight module is upright, define a plurality of zones to the below by the top of described backlight module; And
Reduce the drive current in zone of the top of described backlight module;
Described each regional along continuous straight runs is divided into a plurality of blocks; The drive current of the block that each zone is comprised adjusts respectively, with the temperature of the described backlight module of homogenising.
2. the method for claim 1, is characterized in that, described a plurality of district inclusions one first area and a second area are arranged along vertical direction, and wherein said first area is positioned at the top of described second area.
3. method as claimed in claim 2, is characterized in that, the drive current in the zone of the top of the described backlight module of reduction comprises:
Reduce the drive current of described first area.
4. the method for claim 1, is characterized in that, described method also comprises:
Described backlight module is installed on a base.
5. method as claimed in claim 4, is characterized in that, the drive current in the zone of the top of the described backlight module of reduction comprises:
The drive current in the zone that reduction and described base are distant.
6. the method for claim 1, is characterized in that, described method also comprises:
Reduce described drive current by the zone of the below of described backlight module to the zone of the top of described backlight module.
7. the method for claim 1, is characterized in that, described method also comprises:
With a described backlight module of fixed drive current drives;
Measure the temperature in described a plurality of zones; And
Adjust the drive current in described a plurality of zones according to the temperature of described measurement.
8. the method for claim 1, is characterized in that, the drive current in the zone of the top of the described backlight module of reduction comprises:
Reduce the ON time of control signal of pulse width modulation of drive current in zone of the top of described backlight module.
9. the method for claim 1, is characterized in that, the drive current in the zone of the top of the described backlight module of reduction comprises:
Each zone in described a plurality of zones provides a plurality of light emitting diodes that are connected in series, and the quantity of the light emitting diode in the zone of the top of described backlight module is greater than the zone of the below of described backlight module; And
The light emitting diode that is connected in series that described a plurality of zones are provided is connected in parallel.
10. the method for claim 1, is characterized in that, the drive current in the zone of the top of the described backlight module of reduction comprises:
Each zone in described a plurality of zones provides a plurality of light emitting diodes that are connected in series;
Resistance is connected in series in the light emitting diode in zone of the top of described backlight module; And
The light emitting diode that is connected in series that described a plurality of zones are provided is connected in parallel.
11. the method for claim 1 is characterized in that, described method also comprises:
In described a plurality of zones, one temperature-sensitive sticker is installed respectively; And
The temperature that measures according to described temperature-sensitive sticker is adjusted the drive current in described a plurality of zones.
12. the method for claim 1 is characterized in that, the drive current that the temperature that measures according to described temperature-sensitive sticker is adjusted described a plurality of zones comprises:
When the temperature that measures when described temperature-sensitive sticker rises, reduce the drive current in the zone of corresponding described temperature-sensitive sticker.
13. the method for claim 1 is characterized in that, the setting range of the drive current of the block that described each zone is comprised is in 10%.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US9799246B2 (en) | 2011-05-20 | 2017-10-24 | Ignis Innovation Inc. | System and methods for extraction of threshold and mobility parameters in AMOLED displays |
| US10013907B2 (en) | 2004-12-15 | 2018-07-03 | Ignis Innovation Inc. | Method and system for programming, calibrating and/or compensating, and driving an LED display |
| US20110109655A1 (en) * | 2008-08-08 | 2011-05-12 | Daisuke Takeda | Backlight and display device using the same |
| US10089921B2 (en) | 2010-02-04 | 2018-10-02 | Ignis Innovation Inc. | System and methods for extracting correlation curves for an organic light emitting device |
| US8907991B2 (en) | 2010-12-02 | 2014-12-09 | Ignis Innovation Inc. | System and methods for thermal compensation in AMOLED displays |
| WO2012164475A2 (en) | 2011-05-27 | 2012-12-06 | Ignis Innovation Inc. | Systems and methods for aging compensation in amoled displays |
| US10089924B2 (en) | 2011-11-29 | 2018-10-02 | Ignis Innovation Inc. | Structural and low-frequency non-uniformity compensation |
| CN103606352A (en) * | 2013-11-15 | 2014-02-26 | 深圳市华星光电技术有限公司 | A backlight drive circuit, a driving method thereof, a backlight module and a liquid crystal display |
| CA2900170A1 (en) | 2015-08-07 | 2017-02-07 | Gholamreza Chaji | Calibration of pixel based on improved reference values |
| WO2023028895A1 (en) * | 2021-08-31 | 2023-03-09 | 瑞仪(广州)光电子器件有限公司 | Backlight control method and backlight control circuit |
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