CN1126974C - Device and method for regulating background light of display - Google Patents
Device and method for regulating background light of display Download PDFInfo
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- CN1126974C CN1126974C CN 99123138 CN99123138A CN1126974C CN 1126974 C CN1126974 C CN 1126974C CN 99123138 CN99123138 CN 99123138 CN 99123138 A CN99123138 A CN 99123138A CN 1126974 C CN1126974 C CN 1126974C
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Abstract
The present invention discloses a back light adjusting device of a display device and a method of the back light adjusting device. The back light adjusting device comprises a light sensing element, an amplifying circuit, a manual indicating signal generating circuit and a decision circuit, wherein the light sensing element is used for generating corresponding photocurrent according to a background light source of a display device; the amplifying circuit is coupled with the light sensing element to amplify the photocurrent and generate a self-indicating signal; the manual indicating signal generating circuit generates a manual indicating signal according to the indication of a user; the decision circuit is coupled with the amplifying circuit and the manual indicating signal generating circuit, and generates a back light control signal according to the amplified self-indicating signal and manual indicating signal. The back light control signal can directly drive a back light source to generate the back light with the desired intensity via a proper driving circuit.
Description
Technical field
The present invention is relevant for a kind of control device of display device, the display device that particularly needs (back light) backlight at similar display panels (liquid crystal display (LCD) panel) or the like, a kind of backlight regulation apparatus and method are provided, can be according to the residing operating environment of display device, automatically adjust power backlight, reach operational optimum reelability quality; Simultaneously can and with manual light modulation mechanism, so that need provide the approach of adjustment with manually voluntarily during light modulation the user.
Background technology
Generally need display device backlight, for example LCD or the like mostly is to use in portable electronic installation, as laptop, electronic dictionary and personal digital assistant (personal digitalagent (PDA)) or the like.When action need display device backlight, external light source tends to directly have influence on the visual level of comfort of user.Therefore, above-mentioned portable electron device must provide suitable light modulation mechanism, so that can adjust power backlight at any time.
Known backlight dimming mechanism is mainly based on hand, and the user can flexibly adjust the backlight of display device by button on the specific keyboard that light-control knob or device disposed.Yet this known way has two shortcomings.First, because LCD mostly is to use in portable electronic product, so usually be in different operating environment (different background light), even in operating process, promptly be in mobile state, when for example in the vehicles that move, using these portable electron devices.Therefore, the user must often carry out light modulation, even the job in hand that may also need to stop when operation is carried out light modulation.So can cause the inconvenience in the use certainly.The second, the user may be for fear of frequent adjustment operation backlight, and back light is fixed on the stronger scale.This practice no doubt can reach certain effect of saving operation, but can extend out another problem that is the problem of electrical source consumption.General portable electron device is because therefore its characteristic movably mostly uses battery as power supply.The considerable problem of portable type electronic product often of also therefore economizing on electricity.If consumed too many unnecessary electric power in order to economize trouble, obviously be not the suitable practice.
Summary of the invention
In view of this, fundamental purpose of the present invention promptly is to provide a kind of backlight regulation apparatus and method of display device, can be automatically external environment when using, adjust needed size backlight.On the other hand, also can avoid the operator in order to save the action of light modulation, and waste too much electric power resource.
In addition, the present invention also aims to provide the backlight regulation apparatus and the method for display device, not only can automatically adjust backlight, simultaneously also can be when the user need carry out manual adjustment, switch and get back to manual light-modulating mode, set up power backlight on their own by the user.
According to above-mentioned purpose, the backlight regulation apparatus of a kind of display device that the present invention proposes, in order to produce a backlight control signal to a generation module backlight, use and adjust the power backlight that this generation module backlight produced, this backlight regulation apparatus comprises: a light sensing element, according to the background light source of this display device, produce corresponding photocurrent; One amplifying circuit is coupled to described light sensing element, in order to amplify described photocurrent and to produce an automatic indicator signal; One manual indicator signal produces circuit, according to user's indication, produces manual indicator signal; One decision-making circuit is coupled to described amplifying circuit and described manual indicator signal produces circuit, and described automatic indicator signal and described manual indicator signal according to after amplifying produce described backlight control signal; When described manual indicator signal produces circuit and receives described user and indicate, promptly send a shutdown signal to described amplifying circuit, in order to end the output of described automatic indicator signal.
In addition, manually indicator signal generation circuit can comprise: an input part (keyboard), in order to receive this user's indication; And a control circuit (BIOS control circuit), be coupled to input part, when receiving the user when indicating, send corresponding manual indicator signal to decision-making circuit, and send shutdown signal to amplifying circuit.
Backlight adjusting method of the present invention is the photocurrent that utilizes a light sensing element to detect the background light source of display device and produce correspondence.Utilize an amplifying circuit again, amplify photocurrent and produce an automatic indicator signal.Utilize the continuous-current convertor (DC inverter) in the generation module backlight at last, drive back light, use and send the backlight of corresponding power according to automatic indicator signal.When the user assigns manual indicator signal by keyboard, then close photocurrent and utilize continuous-current convertor, drive this back light according to manual indicator signal.
Backlight regulation apparatus of the present invention has following advantage:
Backlight regulation apparatus can be automatically external environment when using, that is the power of background light source is adjusted the needed power backlight of this display device.On the other hand, also can avoid the user in order to save the trouble of light modulation action, and waste too much electric power resource.
2. in addition, backlight regulation apparatus of the present invention is and has used mechanism with an automatic light meter and manual light modulation mechanism, therefore for the user, also can set up power backlight on their own by the user according to the situation of individual operating habit and different application.
Description of drawings
For above-mentioned purpose of the present invention, characteristic and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. elaborate.
Fig. 1 represents the detailed circuit diagram of the backlight regulation apparatus in the embodiment of the invention.
Wherein:
1: back light; 2: optical sensor; 4: amplifying circuit; 6: decision-making circuit; The 7:BIOS control circuit; 8: keyboard; The 9:DC/AC inverter; 90:PWM produces circuit; Q1, Q2, Q3: transistor; R1, R2: resistance; D1, D2: diode; T1: transformer; 10: automatic indicator signal; 20: manual indicator signal; 30: shutdown signal.
Embodiment
Backlight regulation apparatus of the present invention mainly is that mechanism with an automatic light meter and manual light modulation mechanism are incorporated in the adjusting control circuit of display device, also can carry out light modulation voluntarily by the user simultaneously so that carry out light modulation automatically.Below describe in detail with an embodiment.
Fig. 1 represents the detailed circuit diagram of the backlight regulation apparatus in the embodiment of the invention.In Fig. 1,1 expression produces back light backlight.In addition, comprise optical sensor 2, amplifying circuit 4, decision-making circuit 6, BIOS control circuit 7, keyboard 8 and DC/AC inverter 9 in the backlight regulation apparatus.Wherein, back light and DC/AC inverter 9 are as a generation module backlight, and according to the backlight control signal of being delivered to, it is backlight to produce corresponding different powers.Its action below is described in regular turn.
Optical sensor 2 is as light sensing element, is used for detecting the bias light power of display device external environment.Optical sensor 2 can produce corresponding photocurrent along with the bias light power.Because the photocurrent that general optical sensor is produced is quite faint, therefore must deliver to decision-making circuit 6 through the processing and amplifying of amplifying circuit 4, this signal is called automatic indicator signal 10.If currently used is pattern with an automatic light meter, this automatic indicator signal 10 can be sent to DC/AC inverter 9, drives back light 1 and sends backlight corresponding to external environment.On the other hand, if currently used be manual light-modulating mode, then keyboard 8 is imported the device of backlight control as the user, and the processing by the BIOS control circuit, produces manual indicator signal 20 and delivers to decision-making circuit 6.Similarly, after delivering to DC/AC inverter 9,1 generation of driving back light is backlight corresponding to external environment.
In the present embodiment, the preset mode of display device is a pattern with an automatic light meter, that is, be to adjust power backlight by the automatic indicator signal 10 that optical sensor 2 and amplifying circuit 4 are produced.When the user is used for adjusting button backlight on by lower keyboard 8, i.e. expression need enter manual light-modulating mode.At this moment, BIOS control circuit 7 is promptly sent a shutdown signal 30 to amplifying circuit 4, by its switch inside element (aftermentioned), closes pattern with an automatic light meter, and the steering order of assigning according to the user produces manual indicator signal 20 simultaneously.
Below describe each element in detail.
Amplifying circuit 4 has comprised transistor Q1, transistor Q2, resistance R 1 and resistance R 2, and provides bias voltage by voltage source V DD.Transistor Q1 and resistance R 1 and R2 are the usefulness as amplifier.The base stage of transistor Q1 receives by photocurrent and converts signal (by resistance R 1 conversion) behind the voltage to, and its collector is then exported the automatic indicator signal 10 after the amplification.Collector/emitter-base bandgap grading of transistor Q2 then is to be connected between the base stage and earth terminal of transistor Q1, and its base stage then receives the shutdown signal of sending here from BIOS control circuit 7 30, uses the connection of switching between two ends.Therefore, when shutdown signal 30 makes that transistor Q2 is opening, the base stage of transistor Q1 can be connected to earth terminal, produce the effect of closing.
Keyboard 8 is input medias that this portable electron device disposes, and utilizes several specific keys wherein, can be defined as the button of light modulation.In general portable electron device, the button that keyboard 8 is imported can be detected and be handled by BIOS control circuit 7 in addition.BIOS control circuit 7 has herein comprised hardware and two parts of bios software.Wherein, hardware comprises and is used for detecting the keyboard controller of keyboard scancode and is used for carrying out the bios program sign indicating number and with the processor of keyboard scancode decipher.The information that bios software is transmitted according to keyboard 8 produces corresponding manual indicator signal 20, and when the user desires to enter manual light-modulating mode, produces shutdown signal 30 and deliver to amplifying circuit 4.
6 of decision-making circuits comprise the diode D1 and the D2 of two unidirectional conductings.Import signal 10 with an automatic light meter and manual dim signal 20 on the anode of diode D1 and D2 respectively, its negative electrode then is coupled to each other, and sends actual backlight control signal.
9 of DC/AC inverters are to be responsible for converting backlight control signal to the actual electric current that is used for driving back light 1.Wherein, PWM (pulse width Modulation) generator 90 is the backlight control signals according to input, produces the pulse-modulated signal (PWM) with respective pulses width.This pulse-modulated signal then is sent to the base stage of transistor Q3, and the opening and closing action by transistor Q3 can be connected to transformer T1 with voltage source V M intermittently, uses producing corresponding drive current, allows back light 1 produce the backlight of correspondence.
Below describe when carrying out the light modulation action the detailed action of backlight regulation apparatus in detail.
Under normal circumstances, this display device electronic installation of this display device (or comprise) is to be set under the pattern with an automatic light meter.That is, by the automatic indicator signal 10 that optical sensor 2 and amplifying circuit 4 are produced, control backlight that back light 1 is produced.When optical sensor 2 detects external light source, can decide the photocurrent size of its generation according to the bias light power that is detected.After then utilizing resistance R 1 to convert voltage to, utilize the magnifying state of transistor Q1, amplify the automatic indicator signal 10 of generation.After diode D1 conducting, utilize PWM to produce circuit 90, transistor Q3 and transformer T1, produce corresponding drive current, use making back light 1 send the backlight of respective intensities.In addition, if when the user presses control button specific on the lower keyboard 8, BIOS control circuit 7 can detect this state immediately, and produces shutdown signal 30 on the base stage of transistor Q2, so that with the base earth of transistor Q1.Simultaneously, according to the dimmer command that the user assigned, produce corresponding manual indicator signal 20.After diode D2 conducting, utilize PWM to produce circuit 90, transistor Q3 and transformer T1, produce corresponding drive current, use making back light 1 send the backlight of respective intensities.By this, power backlight is adjusted in the instruction that back light just can be assigned according to surrounding environment or user.
Though the present invention is with a preferred embodiment; as mentioned above; be described; yet this embodiment is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention, can make many changes and modification, so protection scope of the present invention should be as the criterion with the accompanying Claim scope.
Claims (6)
1. the backlight regulation apparatus of a display device in order to produce a backlight control signal to a generation module backlight, is used and is adjusted the power backlight that this generation module backlight produced, and this backlight regulation apparatus comprises:
One light sensing element according to the background light source of this display device, produces corresponding photocurrent;
One amplifying circuit is coupled to described light sensing element, in order to amplify described photocurrent and to produce an automatic indicator signal;
One manual indicator signal produces circuit, according to user's indication, produces manual indicator signal;
One decision-making circuit is coupled to described amplifying circuit and described manual indicator signal produces circuit, and described automatic indicator signal and described manual indicator signal according to after amplifying produce described backlight control signal;
It is characterized in that, when described manual indicator signal produces circuit and receives described user and indicate, promptly send a shutdown signal to described amplifying circuit, in order to end the output of described automatic indicator signal.
2. backlight regulation apparatus as claimed in claim 1 is characterized in that, described manual indicator signal produces circuit and comprises:
One input part is in order to receive described user's indication; And
One control circuit is coupled to described input part, when the described user of reception indicates, sends corresponding described manual indicator signal to described decision-making circuit, and sends described shutdown signal to described amplifying circuit.
3. backlight regulation apparatus as claimed in claim 2 is characterized in that, described control circuit is the BIOS control circuit in the personal computer system.
4. backlight regulation apparatus as claimed in claim 1 is characterized in that, described amplifying circuit comprises:
Transistor is used in one amplification, and its input end couples described light sensing element, produces described automatic indicator signal in order to described photocurrent is amplified; And
One switch transistor is coupled to described amplification with between transistorized input end and the earth terminal, according to described switching signal, in order to switch described amplification with the connection between transistorized input end and the earth terminal.
5. backlight regulation apparatus as claimed in claim 1 is characterized in that, described decision-making circuit comprises:
One first diode, its anode is coupled to described amplifying circuit, in order to receive described automatic indicator signal; And
One second diode, its anode are coupled to described manual indicator signal and produce circuit, and in order to receive described manual indicator signal, described first diode is connected with the negative electrode of described second diode, in order to export described backlight control signal.
6. the backlight adjusting method of a display device is characterized in that, comprises the following steps:
One light sensing element is set, in order to background light source that detects described display device and the photocurrent that produces correspondence;
Utilize an amplifying circuit, amplify described photocurrent and produce an automatic indicator signal;
Utilize a direct current transverter, drive a back light, use and send the backlight of corresponding power according to described automatic indicator signal; And
When the user assigns manual indicator signal by keyboard, then close described photocurrent and utilize described continuous-current convertor, drive described back light according to described manual indicator signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123138 CN1126974C (en) | 1999-10-19 | 1999-10-19 | Device and method for regulating background light of display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99123138 CN1126974C (en) | 1999-10-19 | 1999-10-19 | Device and method for regulating background light of display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1293387A CN1293387A (en) | 2001-05-02 |
| CN1126974C true CN1126974C (en) | 2003-11-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99123138 Expired - Fee Related CN1126974C (en) | 1999-10-19 | 1999-10-19 | Device and method for regulating background light of display |
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| Country | Link |
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| CN (1) | CN1126974C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1319421C (en) * | 2002-06-26 | 2007-05-30 | 明基电通股份有限公司 | Detection and regulation method for LCD brightness |
| CN100403124C (en) * | 2004-06-30 | 2008-07-16 | 晶元光电股份有限公司 | Plane light source device |
| CN105551441B (en) * | 2016-01-27 | 2018-03-16 | 深圳创维－Rgb电子有限公司 | A kind of region backlight regulation apparatus and its method of adjustment |
| CN107967898B (en) * | 2017-11-01 | 2020-12-29 | 昆山龙腾光电股份有限公司 | Backlight adjusting circuit and backlight adjusting method |
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1999
- 1999-10-19 CN CN 99123138 patent/CN1126974C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1293387A (en) | 2001-05-02 |
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