CN104049930B - Brightness regulating circuit - Google Patents
Brightness regulating circuit Download PDFInfo
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- CN104049930B CN104049930B CN201410265684.8A CN201410265684A CN104049930B CN 104049930 B CN104049930 B CN 104049930B CN 201410265684 A CN201410265684 A CN 201410265684A CN 104049930 B CN104049930 B CN 104049930B
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Abstract
A kind of brightness regulating circuit, lighten circuit by what is be connected with X86 computer platform processors U1 and dim circuit, direct control platform processor U1；The button Key1 that lightens wherein lightened in circuit is connected with electrostatic protection diode D1, by the first filter circuit, is connected to X86 platform processors U1 pin GPIOx, is monolithically fabricated the regulation circuit that an outside backlight lightens instruction；The button Key2 that dims wherein dimmed in circuit is connected with electrostatic protection diode D2; pass through the second filter circuit being made up of resistance R3 and electric capacity C2; X86 platform processors U1 pin GPIOy is connected to, is monolithically fabricated the regulation circuit that an outside backlight dims instruction.The regulation circuit realiration passes through relatively simple external circuit, realized with reference to X86 platform controllers and receive user's tune luminance instructions, the function of output pulse width Regulate signal, the communication avoided on being communicated with third party IC is sluggish, overcome and insensitive problem is reacted to regulating command, and save power consumption and cost.
Description
【Technical field】
The present invention relates to electronic computer mainboard, more particularly to all-in-one without EC chips (Embedded Controller,
A kind of embedded controller chip) computer motherboard.Pass through X86 computer motherboards PCH (Platform in itself
Controlling Hub, it is the platform courses chip that X86 computer motherboards use) come to the LVDS interface (Low built in it
Voltage Differential Signaling, be a kind of technology of Low Voltage Differential Signaling interface) carry out brightness regulation method.
【Background technology】
All-in-one machine product is increasingly popularized, and is not only used in the family, and is led in sector applications such as advertisement, medical treatment
The application in domain is also more and more common, and these products it is more use LVDS display screens, size typically from 24 cun to 60 cun, this
The computer motherboard for being assemblied in all-in-one machine product is required to possess the function of LVDS backlights regulation.
Now, the X86 computer motherboards applied to all-in-one machine product, its LVDS backlight control part are most of
Product is realized by using EC chips, or independent LVDS conversion chips.Following missing be present in this method：
1) sensitivity of backlight regulation is poor.Because user adjusts the operational order of backlight, it is necessary to first pass through EC either
Other conversion chips, then send the LVDS controllers of X86 mainboards to, several module joint debuggings, hysteresis phenomenon, user sometimes be present
It is poor sensitivity to experience direct feel.
2) mainboard power consumption is higher.The increased EC chips of motherboard design scheme either LVDS conversion chips, it is desirable to provide volume
Outer electric current can just make its working properly to IC, and the heat dissipations of IC in itself so that the power consumption of mainboard further improves, it is difficult to
Meet the increasingly stricter energy-saving index of all-in-one product.
3) mainboard cost is higher.EC chips either LVDS conversion chips are employed due to extra so that computer motherboard
Manufacturing cost increase.
【The content of the invention】
The present invention proposes a kind of sensitivity of raising LVDS backlights regulation for case above, reduces mainboard manufacture production
The brightness regulating circuit of cost and power consumption.Abandon by the way of EC or LVDS conversion ICs, directly utilized in the method
The platform courses chip of X86 computer motherboards realizes that backlight illumination adjusts.
Brightness regulating circuit involved in the present invention, by lightening electricity with what X86 computer platform processors U1 was connected
Road and dim circuit, direct control platform processor U1；Wherein lightening circuit includes lightening button Key1 and the first filtered electrical
Road, wherein this lighten button Key1 and be connected with electrostatic protection diode D1, by be made up of resistance R1 and electric capacity C1 first
Filter circuit, X86 platform processors U1 pin GPIOx is connected to, is monolithically fabricated the regulation that an outside backlight lightens instruction
Circuit；Wherein dimming circuit includes dimming button Key2 and the second filter circuit, wherein dimming button Key2 and electrostatic protection two
Pole pipe D2 is connected, and by the second filter circuit being made up of resistance R3 and electric capacity C2, is connected to X86 platform processors U1's
Pin GPIOy, it is monolithically fabricated the regulation circuit that an outside backlight dims instruction；
Wherein diode D1, D2 plays a part of electrostatic protection, and the first and second filter circuits play and filter out signal and do
The effect disturbed.
A pull-up resistor R2, pull-up resistor R2 other ends connection power supply+3.3V are connected at the first filter circuit,
Pull-up resistor R2, allows signal to maintain 3.3V steady-state value.
A pull-up resistor R4, pull-up resistor R4 other ends connection power supply+3.3V are connected at the second filter circuit,
Pull-up resistor R4, allows signal to maintain 3.3V steady-state value.
X86 platform processors U1 is platform controller chip, by pin GPIOx, GPIOy come reception signal, and is distinguished
User instruction is to lighten backlight or dim backlight.
According to ACPI Specification (Advanced Configuration and Power Management Interface, height
Level configuration and power-management interface specification), backlight is divided into different ranks, corresponding U1 PWM pins output according to brightness
The waveform of different duty (provides that PWM signal dutyfactors corresponding to most dark rank are 30%, most bright rank pair in ACPI Specification
100%) the pwm signal dutycycle answered is.
Regulation is divided into the different grades of pulse width adjustment signal PWM of output, the LVDS_PWM pins of LVDS screen interfaces
Different grades of pulse width adjustment signal PWM is received, realizes that LVDS backlights are bright by the change of pwm signal pulse width
The regulation of degree.
This method is realized by relatively simple external circuit, is realized with reference to X86 platform controllers and is received user's tune
The function of luminance instructions, output pulse width Regulate signal, it is sluggish to avoid communication on being communicated with third party IC, overcome due to
Link up it is sluggish bring insensitive problem is reacted to regulating command, improve Consumer's Experience impression, and save power consumption and into
This.
【Brief description of the drawings】
Fig. 1 is the circuit diagram of brightness regulating circuit of the present invention；
【Embodiment】
Accompanying drawing 1 is refer to, illustrated therein is the circuit diagram of the brightness regulating circuit, for needing at present by EC chips,
Or independent LVDS conversion chips are realized to the brightness regulation of computer, and the problem of produce regulation poor sensitivity.Carry
Go out a kind of sensitivity of raising LVDS backlights regulation, reduce mainboard manufacture production cost and the brightness regulating circuit of power consumption.
Abandoned in the circuit by the way of EC or LVDS conversion ICs, directly utilized the platform courses chip of X86 computer motherboards
Realize that backlight illumination adjusts.
The regulation circuit lightens circuit and dims circuit by what is be connected with X86 computer platform processors U1, directly
Control platform processor U1；Wherein lightening circuit includes lightening button Key1 and the first filter circuit, and wherein this lightens button
Key1 is connected with electrostatic protection diode D1, by the first filter circuit being made up of resistance R1 and electric capacity C1, is connected to X86
Platform processor U1 pin GPIOx, the regulation circuit that an outside backlight lightens instruction is monolithically fabricated, in the first filter circuit
One pull-up resistor R2 of place's connection, pull-up resistor R2 other ends connection power supply+3.3V, pull-up resistor R2, allows signal to maintain
In 3.3V steady-state value.
Wherein dimming circuit includes dimming button Key2 and the second filter circuit, wherein dimming button Key2 and electrostatic protection
Diode D2 is connected, and by the second filter circuit being made up of resistance R3 and electric capacity C2, is connected to X86 platform processors U1's
Pin GPIOy, it is monolithically fabricated the regulation circuit that an outside backlight dims instruction.
Wherein diode D1, D2 plays a part of electrostatic protection, and the first and second filter circuits play and filter out signal and do
The effect disturbed.
X86 platform processors U1 is platform controller chip, by pin GPIOx, GPIOy come reception signal, and is distinguished
User instruction is to lighten backlight or dim backlight.
According to ACPI Specification (Advanced Configuration and Power Management Interface, height
Level configuration and power-management interface specification), backlight is divided into different ranks, corresponding U1 PWM pins output according to brightness
The waveform of different duty (provides that PWM signal dutyfactors corresponding to most dark rank are 30%, most bright rank pair in ACPI Specification
100%) the pwm signal dutycycle answered is.
Regulation is divided into the different grades of pulse width adjustment signal PWM of output, the LVDS_PWM pins of LVDS screen interfaces
Different grades of pulse width adjustment signal PWM is received, realizes that LVDS backlights are bright by the change of pwm signal pulse width
The regulation of degree.
It is described above, only it is present pre-ferred embodiments, any formal limitation not is made to the present invention, although
The present invention is disclosed above with preferred embodiment, but is not limited to the present invention, any person skilled in the art,
Do not depart from the range of technical solution of the present invention, when the technology contents using the disclosure above make a little change or are modified to equivalent
The equivalent embodiment of change, as long as being without departing from technical solution of the present invention content, refer to implement to more than according to the technology of the present invention
Any simple modification, equivalent change and modification that example is made, is belonged in the range of technical solution of the present invention.
Claims (5)
1. a kind of brightness regulating circuit, it is characterised in that the regulation circuit with X86 computer platform processors U1 by being connected
Lighten and circuit and dim circuit, direct control platform processor U1；Wherein lightening circuit includes lightening button Key1 and first
Filter circuit, wherein this lighten button Key1 and be connected with electrostatic protection diode D1, by being made up of resistance R1 and electric capacity C1
The first filter circuit, be connected to X86 platform processors U1 pin GPIOx, be monolithically fabricated an outside backlight and lighten instruction
Regulation circuit；Wherein dimming circuit includes dimming button Key2 and the second filter circuit, wherein dimming button Key2 and electrostatic
Protection diode D2 is connected, and by the second filter circuit being made up of resistance R3 and electric capacity C2, is connected to X86 platform processors
U1 pin GPIOy, it is monolithically fabricated the regulation circuit that an outside backlight dims instruction.
2. brightness regulating circuit according to claim 1, it is characterised in that wherein diode D1, D2 plays electrostatic protection
Effect, and the first and second filter circuits play a part of filtering out signal interference.
3. brightness regulating circuit according to claim 1, it is characterised in that a pull-up electricity is connected at the first filter circuit
R2 is hindered, pull-up resistor R2 other ends connection power supply+3.3V, pull-up resistor R2, allows signal to maintain 3.3V steady-state value.
4. brightness regulating circuit according to claim 1, it is characterised in that a pull-up electricity is connected at the second filter circuit
R4 is hindered, pull-up resistor R4 other ends connection power supply+3.3V, pull-up resistor R4, allows signal to maintain 3.3V steady-state value.
5. brightness regulating circuit according to claim 1, it is characterised in that X86 platform processors U1 is platform controller core
Piece, by pin GPIOx, GPIOy come reception signal, and it is to lighten backlight or dim backlight to distinguish user instruction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410265684.8A CN104049930B (en) | 2014-06-13 | 2014-06-13 | Brightness regulating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410265684.8A CN104049930B (en) | 2014-06-13 | 2014-06-13 | Brightness regulating circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104049930A CN104049930A (en) | 2014-09-17 |
| CN104049930B true CN104049930B (en) | 2017-11-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410265684.8A Active CN104049930B (en) | 2014-06-13 | 2014-06-13 | Brightness regulating circuit |
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| Country | Link |
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| CN (1) | CN104049930B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105242749A (en) * | 2015-09-07 | 2016-01-13 | 深圳微步信息股份有限公司 | Mainboard of all-in-one computer, all-in-one computer, and resolution adjustment method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7180250B1 (en) * | 2005-01-25 | 2007-02-20 | Henry Michael Gannon | Triac-based, low voltage AC dimmer |
| CN101668367A (en) * | 2008-09-03 | 2010-03-10 | 昆达电脑科技(昆山)有限公司 | Brightness regulating circuit |
| CN102214150A (en) * | 2010-04-01 | 2011-10-12 | 联发科技股份有限公司 | Signal processing device, signal processing method and corresponding electronic device |
| CN103687238A (en) * | 2013-12-13 | 2014-03-26 | 卫星电子（中山）有限公司 | Novel LED two-line dimming control circuit |
-
2014
- 2014-06-13 CN CN201410265684.8A patent/CN104049930B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7180250B1 (en) * | 2005-01-25 | 2007-02-20 | Henry Michael Gannon | Triac-based, low voltage AC dimmer |
| CN101668367A (en) * | 2008-09-03 | 2010-03-10 | 昆达电脑科技(昆山)有限公司 | Brightness regulating circuit |
| CN102214150A (en) * | 2010-04-01 | 2011-10-12 | 联发科技股份有限公司 | Signal processing device, signal processing method and corresponding electronic device |
| CN103687238A (en) * | 2013-12-13 | 2014-03-26 | 卫星电子（中山）有限公司 | Novel LED two-line dimming control circuit |
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| Publication number | Publication date |
|---|---|
| CN104049930A (en) | 2014-09-17 |
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