CN1763592A - Liquid crystal display capable of automatically adjusting brightness - Google Patents
Liquid crystal display capable of automatically adjusting brightness Download PDFInfo
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- CN1763592A CN1763592A CN 200410086037 CN200410086037A CN1763592A CN 1763592 A CN1763592 A CN 1763592A CN 200410086037 CN200410086037 CN 200410086037 CN 200410086037 A CN200410086037 A CN 200410086037A CN 1763592 A CN1763592 A CN 1763592A
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Abstract
The invention provides a lightness self-control LCD display, which comprises the following parts: power supply device, temperature sensing device of phototropism temperature, inverter for lightness adjustment of power transformation voltage, main activation circuit for supplying the adjustment signal of lightness to inverter. The LCD display can prevent the lightness falling down increasingly along with the long activation time.
Description
Technical field
The invention relates to LCD, more particularly, about a kind of LCD that can regulate brightness automatically.
Background technology
Usually, display be a kind of image signal of the formula that fixes in the output of connected computing machine through the processing of a series of signal such as digital sampling and convergent-divergent after, these image signals are presented at device on the picture.
Because the development of modern technologies, display is from using the miniscope of leonard's tube, gradually to the display development of maximizing, along with this trend, LCD (LCD) is as a kind of representative that is suitable for making the flat panel displaying element of giant display, and it has adopted advanced digital form, and this compares with CRT mode in the past, it is advantageous that image in light weight and that show is more clear, the therefore market of this LCD development rapidly.
LCD its thickness under the situation that does not influence picture size is thinner relatively, and weigh light, thus it at first by utilization with want such as notebook computer etc. that cube is little, in the device of weigh light and low power consumption.LCD is compared with the CRT monitor with same picture size, and its power consumption has only 1/3 of CRT monitor, and its weight advantage is also apparent.
The operation logic of LCD is different fully with CRT monitor.The operation logic of CRT monitor is to inject electron beam on one point, makes the RGB light-emitting phosphor.Different therewith, LCD has been utilized according to LCD unit by the back light of ON/OFF.This light carries out the fluctuation of certain orientation.The light that carries out vertical fluctuation can not pass through optical filter, and the light that only carries out the level fluctuation could pass through optical filter.LCD is utilized electric field, arranges liquid crystal molecule according to certain orientation, at this moment, makes the light that fluctuates on certain orientation pass through optical filter selectively.
That is, on molecular structure property, because effect of electric field, liquid crystal is linear array; On mechanical property, liquid crystal can carry out reversing of 90 degree units between two electro-conductive glass.Liquid crystal molecule is turned round to turn 90 degrees and is called TN (Twisted Nematic), and liquid crystal molecule reverses 270 degree and is called STN (Super Twisted Nematic).Place liquid crystal relative between two electro-conductive glass after adding electric field, can rearrange according to the direction of electric field, and change its luminous flux.
LCD has been used color filer, makes screen display go out shades of colour.The pixel unit of filter plate is made of 3 subpixel of RGB.Usually, in LCD, RGB has adopted the structure of go disk shape.
But, because TFT LCD (LCD) can only pass through light, and himself can not be luminous, therefore need a kind of liquid crystal that can make to pass through light, as light source, this light just is called backlight with it.Back side illuminated in LCD backlight, light sees through liquid crystal display equipment screen, injects people's eyes.
With reference to the accompanying drawings, describe with regard to the LCD that adopts conventional art.
Fig. 1 is the structural drawing that is used to illustrate the LCD that adopts conventional art; Fig. 2 be to LCD in the past along with driving time is passed, the accompanying drawing that the backlight illumination characteristic changes and describes; Fig. 3 be to LCD in the past along with driving time is passed, the accompanying drawing that temperature characterisitic backlight changes and describes; Fig. 4 be to LCD in the past along with the variation of brightness regulation voltage, the accompanying drawing that backlight illumination changes and describes.
As shown in Figure 1, the LCD of employing conventional art is by constituting with lower member:
Be used for being provided for signal (Von/off) that control inverter 30 opens and closes and the brightness regulation control voltage signal (Vbr) that is used for liquid crystal display device module 50 brightness regulation, and transmit the main driving loop apparatus 10 of vertical/horizontal synchronizing signals (Signal/HV sync) to liquid crystal display device module 50 to inverter 30;
Be used for providing the electric supply installation 20 of power supply to inverter 30 and liquid crystal display device module;
Be used for opening closing control signal (Von/off) according to the brightness regulation control voltage signal (Vbr) and the inverter of inverter 30 and liquid crystal display device module 50, the power supply that electric supply installation 20 provides is controlled, and, provide the inverter 30 of necessary driving power in order to carry out 40 drivings backlight;
The driving power that utilizes inverter 30 to provide provides backlight 40 of light source to liquid crystal display device module;
Be used for to be presented at from the horizontal/vertical synchronization signals that main driving loop apparatus 10 obtains the liquid crystal display device module 50 on the picture.
LCD at first converts AC power to direct supply by electric supply installation 20, and provides it to liquid crystal display device module 50 and inverter 30.
As shown in Figure 2, backlight normally used be fluorescent light, brightness backlight be along with the passing of driving time can reduce, its brightness will be saturated, and outputting standard brightness through certain hour (17,18 inches is 30 minutes, and 30 or 40 inches is 2 hours).According to the characteristic as fluorescent light backlight, when normal brightness was 100, the initial stage brightness of fluorescent light will reach 110 to 130% of normal brightness, through certain hour, and outputting standard brightness behind the luminance saturation.As shown in Figure 3, As time goes on, temperature backlight will rise; As shown in Figure 4, along with the main variation that drives the brightness regulation control voltage signal (Vbr) in the loop apparatus, change has also taken place in backlight illumination.
There is following problem in the LCD of this employing conventional art.
First, because characteristic as fluorescent light backlight, the initial stage brightness ratio normal brightness height of actual displayed in the liquid crystal display device module, even through after the certain hour, brightness reaches normal condition, brightness effects neither be fine, so LCD self quality just seems lower, brightness regulation can be got too high.
The second, because the fluorescent light self characteristics, the initial stage can produce unnecessary power wastage when driving, because initial stage when driving, in addition therefore higher voltage may cause the reduction in electric supply installation self life-span.
Summary of the invention
In order to address the above problem, the invention provides a kind of LCD that can make the automatic adjusting brightness of keeping in balance automatically according to the liquid crystal display device backlight lightness of time or the variation of temperature characterisitic generation light characteristic.
To achieve these goals, the present invention regulates the LCD of brightness automatically based on possessing LCD (LCD) module and being the LCD backlight of above-mentioned LCD (LCD) module supply power, comprises with lower member:
Be used to the electric supply installation of inverter (Inverter) and LCD (LCD) module supply power;
The temperature sensing device that is used for the above-mentioned temperature backlight of perception;
Be used for to offer the main loop that drives of above-mentioned inverter with the corresponding brightness regulation control of the temperature of said temperature sensing device perception voltage signal;
Be used for the power supply that above-mentioned electric supply installation is supplied with is carried out transformation, make it and offer the inverter that the above-mentioned main brightness regulation control voltage that drives loop apparatus conforms to.
Utilize such structure, As time goes on the present invention has improved, and the phenomenon that brightness of fluorescent lamp descends makes the user in the process of using LCD, has stable visual effect, simultaneously, has also prevented unnecessary brightness regulation operation.
The wherein said main loop apparatus that drives comprises with lower member:
Be used for conforming to the temperature variation of said temperature sensing device perception, and the storer that stores according to the brightness regulation control change in voltage data that the temperature variation that is used to regulate and export above-mentioned brightness regulation control voltage produces;
Be used for the data that store according to above-mentioned storer, make above-mentioned brightness regulation control voltage offer the microcomputer of above-mentioned inverter.
In addition, the above-mentioned main increase that drives loop apparatus according to the temperature backlight of perception in the said temperature sensing device also increases above-mentioned brightness regulation control voltage thereupon.
As mentioned above, the LCD of automatic adjusting brightness of the present invention has following effect:
The first, to have improved As time goes on, the phenomenon of reduction takes place in brightness of fluorescent lamp, makes the user in the process of using LCD, has stable visual effect, simultaneously, has also prevented unnecessary brightness regulation operation.
The second, unnecessary power wastage takes place when the initial stage of reduction as much as possible drives, and has reduced the load that imposes on electric supply installation as much as possible, make the life-span of electric supply installation obtain prolonging.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.Therefore, the technical scope of this invention can not be confined to the detailed description on the detailed book; Must determine its technical scope according to the scope of patented claim.
Description of drawings
Fig. 1 is the structural drawing that is used to illustrate the LCD that adopts conventional art;
Fig. 2 be to LCD in the past along with driving time is passed, the synoptic diagram that the backlight illumination characteristic changes and describes;
Fig. 3 be to LCD in the past along with driving time is passed, the accompanying drawing that temperature characterisitic backlight changes and describes;
Fig. 4 be to LCD in the past along with the variation of brightness regulation voltage, the synoptic diagram that backlight illumination changes and describes;
Fig. 5 is the structural drawing that is used to illustrate ABC LCD of the present invention;
Fig. 6 is the synoptic diagram that the brightness regulation voltage regulation characteristic that produces owing to ABC LCD backlight variation of temperature of the present invention is changed;
Figure 7 shows that LCD to automatic adjusting brightness of the present invention along with driving time is passed, backlight illumination characteristic variations synoptic diagram takes place.
Symbol description
100: the main loop apparatus 110 that drives: microcomputer
120: memory storage 200: electric supply installation
300: inverter 400: backlight
500: LCD (LCD) module 600: temperature sensing device
Embodiment
With reference to the accompanying drawings, be elaborated with regard to purpose of the present invention, characteristic and advantage.
Fig. 5 is the structural drawing that is used to illustrate ABC LCD of the present invention; Fig. 6 changes the synoptic diagram that describes to the brightness regulation voltage regulation characteristic that the LCD backlight variation of temperature owing to automatic adjusting brightness of the present invention produces; Figure 7 shows that LCD to automatic adjusting brightness of the present invention along with driving time is passed, the synoptic diagram of backlight illumination characteristic variations takes place.
As shown in Figure 5, ABC LCD of the present invention comprises with the lower part:
Be used for being provided for the signal (Von/off) of control inverter 300 opening and closing and being used for the brightness regulation control voltage signal (Vbr) of liquid crystal display device module 500 brightness regulation, and transmit the main loop apparatus 100 that drives of vertical/horizontal synchronizing signals (Signal/HV sync) to liquid crystal display device module 500 according to the temperature variation of inverter 400 to inverter 300;
Be used for providing the electric supply installation 200 of power supply to inverter 300 and liquid crystal display device module 500;
Be used for opening closing control signal (Von/off) according to the brightness regulation control voltage signal (Vbr) and the inverter of inverter 300 and liquid crystal display device module 500, the power supply that electric supply installation 200 provides is regulated, and, provide the inverter 300 of necessary driving power in order to carry out backlight 400 driving;
The driving power that utilizes inverter 300 to provide provides backlight 400 of light source to liquid crystal display device module;
Be used for to be presented at from the horizontal/vertical synchronization signals that main driving loop apparatus 100 obtains the liquid crystal display device module 500 on the picture;
The temperature that is used for perception backlight 400, and sensing results is sent to the main temperature sensing device 600 that drives loop apparatus 100.
The above-mentioned main loop apparatus 100 that drives comprises with lower member:
Be used for conforming to the temperature variation of said temperature sensing device 600 perception, and the storer 120 that stores of the brightness regulation control change in voltage data that produce according to the temperature variation that is used for regulating and export above-mentioned brightness regulation control voltage (Vbr);
Be used for providing above-mentioned brightness regulation to control the microcomputer 110 that voltage (Vbr) is controlled to above-mentioned inverter 300 to data according to above-mentioned storer 120 storages.
As shown in Figure 3, usually As time goes on, the temperature of the fluorescent light as backlight 400 begins in rising trend, trends towards stablizing (saturation) through becoming behind the certain hour.Along with the increase of time, brightness but is to reduce gradually, and trends towards stablizing but as shown in Figure 2.
Therefore, as shown in Figure 6, in order to solve rising, 400 brightness (cd/m backlight along with 400 temperature backlight
2) problem that take place to reduce, the present invention according to backlight 400 temperature (℃) improved brightness regulation control voltage (Vbr).
In technology in the past, along with the passing of driving time, backlight 400 temperature also rises naturally thereupon, and through behind certain driving time, backlight 400 brightness just trends towards stablizing.
In the present invention, when initial driving backlight, utilize inverter 300 to have added the brightness regulation control voltage (Vbr) lower for microcomputer 110 than conventional art, passing along with driving time, the voltage that utilizes inverter 300 to add for microcomputer 110 increases gradually, makes backlight 400 to trend towards stablizing.
Promptly, because the initial stage backlight is when driving, the initial stage brightness of the fluorescent light as backlight 400 will reach 110 to 130% of normal brightness, therefore at this moment utilize inverter 300, the main loop apparatus 100 that drives has been added it is the brightness regulation control voltage of fundamental voltage 70 to 90%, increase brightness regulation control voltage then gradually, it is conformed to 400 temperature backlight that increase along with the passing of driving time, after backlight 400 temperature stabilization, just the main loop apparatus 100 that drives has been added it is the brightness regulation control voltage of setting voltage 100%.
Therefore the user is with regard to imperceptible liquid crystal display device module lowering of luminance, and as shown in Figure 7, even driving time increases, backlight illumination also can be kept stable.
As mentioned above, the LCD of automatic adjusting brightness of the present invention has following effect:
The first, to have improved As time goes on, the phenomenon of reduction takes place in brightness of fluorescent lamp, makes the user in the process of using LCD, has stable visual effect, simultaneously, has also prevented unnecessary brightness regulation operation.
The second, unnecessary power wastage takes place when the initial stage of reduction as much as possible drives, and has reduced the load that imposes on electric supply installation as much as possible, make the life-span of electric supply installation obtain prolonging.
By above-mentioned description, the related work personnel can carry out various change and modification fully in the scope that does not depart from this invention technological thought.Therefore, the technical scope of this invention can not be confined to the detailed description on the detailed book; Must determine its protection domain according to claim.
Claims (3)
1, a kind of LCD of automatic adjusting brightness, it comprises based on possessing LCD (LCD) module and supply power:
Be used to the electric supply installation of inverter (Inverter) and LCD (LCD) module supply power;
The temperature sensing device that is used for the above-mentioned temperature backlight of perception;
Be used for to offer the main loop that drives of above-mentioned inverter with the corresponding brightness regulation control of the temperature of said temperature sensing device perception voltage signal;
Be used for the power supply that above-mentioned electric supply installation is supplied with is carried out transformation, make it and offer the inverter that the above-mentioned main brightness regulation control voltage that drives loop apparatus conforms to.
2, regulate the brightness LCD according to claim 1 automatically, it is characterized in that, the above-mentioned main loop apparatus that drives comprises:
Be used for conforming to the temperature variation of said temperature sensing device perception, and the storer that stores according to the brightness regulation control change in voltage data that the temperature variation that is used to regulate and export above-mentioned brightness regulation control voltage produces;
Be used for the data that store according to above-mentioned storer, the microcomputer that the above-mentioned inverter of subtend provides above-mentioned brightness regulation control voltage to control.
3, the LCD of automatic adjusting brightness as claimed in claim 1 is characterized in that,
The above-mentioned main increase that drives loop apparatus according to the temperature backlight of said temperature sensor senses also increases above-mentioned brightness regulation control voltage thereupon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410086037 CN1763592A (en) | 2004-10-22 | 2004-10-22 | Liquid crystal display capable of automatically adjusting brightness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410086037 CN1763592A (en) | 2004-10-22 | 2004-10-22 | Liquid crystal display capable of automatically adjusting brightness |
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| CN1763592A true CN1763592A (en) | 2006-04-26 |
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| CN 200410086037 Pending CN1763592A (en) | 2004-10-22 | 2004-10-22 | Liquid crystal display capable of automatically adjusting brightness |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101308634B (en) * | 2007-05-16 | 2010-06-09 | 明基电通股份有限公司 | Display system |
| WO2011009364A1 (en) * | 2009-07-23 | 2011-01-27 | 湖南三一智能控制设备有限公司 | Method and device for controlling backlight of liquid crystal display |
| CN101102631B (en) * | 2006-07-06 | 2012-04-11 | 财团法人工业技术研究院 | System and method for driving light emitters of backlight module using current mixing |
| CN105575340A (en) * | 2016-03-07 | 2016-05-11 | 合一智能科技（深圳）有限公司 | Backlight brightness control system and method |
-
2004
- 2004-10-22 CN CN 200410086037 patent/CN1763592A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101102631B (en) * | 2006-07-06 | 2012-04-11 | 财团法人工业技术研究院 | System and method for driving light emitters of backlight module using current mixing |
| CN101308634B (en) * | 2007-05-16 | 2010-06-09 | 明基电通股份有限公司 | Display system |
| WO2011009364A1 (en) * | 2009-07-23 | 2011-01-27 | 湖南三一智能控制设备有限公司 | Method and device for controlling backlight of liquid crystal display |
| CN105575340A (en) * | 2016-03-07 | 2016-05-11 | 合一智能科技（深圳）有限公司 | Backlight brightness control system and method |
| WO2017152614A1 (en) * | 2016-03-07 | 2017-09-14 | 合一智能科技（深圳）有限公司 | System and method for controlling luminance of backlight source |
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