CN209374038U - A kind of circuit of control brightness of display screen variation - Google Patents
A kind of circuit of control brightness of display screen variation Download PDFInfo
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- CN209374038U CN209374038U CN201920289780.4U CN201920289780U CN209374038U CN 209374038 U CN209374038 U CN 209374038U CN 201920289780 U CN201920289780 U CN 201920289780U CN 209374038 U CN209374038 U CN 209374038U
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Abstract
The utility model provides a kind of circuit of control brightness of display screen variation, including display control unit, constant-current voltage-stabilizing unit and luminescence display unit, the display control unit includes control handle and processor composition, the A foot and B foot being arranged on the control handle are connect with processor, the processor is separately connected with constant-current voltage-stabilizing unit and luminescence display unit, and the constant-current voltage-stabilizing unit is connected with luminescence display unit.Change the display brightness of liquid crystal display by rotation knob, from display brightness be 100% when rotate knob counterclockwise, display brightness drops to 10% from 100% with the speed of 5%/shelves, brightness of display screen is dimmed rapidly, continue rotation, brightness counterclockwise to drop to 1% with the speed of 1%/shelves, environment is set to dark situation at this time, brightness can be adjusted to the gear that a human eye is comfortable on the velocity variations of 0.2%/shelves by brightness.
Description
Technical field
The utility model belongs to airborne and shows equipment technical field, particularly belongs to a kind of control brightness of display screen variation
Circuit.
Background technique
In airborne communication equipment, it is an essential condition of the aircraft in night flight that display backlight brightness is adjustable.
When the navigation of manned vehicle night, it is suitble to the brightness on daytime just to seem especially dazzling on display screen, it is therefore desirable to display screen
Brightness is adjusted, and the display screen on aircraft does not have the coarse adjustment of brightness control function or only brightness at present, especially in dark situation
Under, the minor change of brightness of display screen can all cause visual great variety, and it is partially bright that previous stage brightness occurs in when brightness regulation,
Display screen cannot be adjusted to suitable brightness, the excessive lightness or darkness view so as to cause pilot by the partially dark situation of next stage brightness
Feel fatigue.
Utility model content
In view of this, being solved the purpose of the utility model is to provide a kind of circuit of control brightness of display screen variation
The few problem of brightness of display screen gear, allows pilot that brightness of display screen to be adjusted to the journey that eyes feel comfortable under dark situation
Degree increases brightness change gear the case where brightness is 0~10%, and brightness suitably reduces bright in the case where 10%~100%
Degree variation shelves, simultaneous processor are shown brightness percentage in the display screen lower right corner by LVDS signal.
In order to achieve the above object, specific scheme is as follows:
A kind of circuit of control brightness of display screen variation, including display control unit, constant-current voltage-stabilizing unit and luminescence display
Unit, the display control unit include control handle and processor composition, the A foot and B foot being arranged on the control handle with
Processor connection, the processor is separately connected with constant-current voltage-stabilizing unit and luminescence display unit, the constant-current voltage-stabilizing unit with
Luminescence display unit connection,
The constant-current voltage-stabilizing unit includes voltage stabilizing chip, metal-oxide-semiconductor and resistor-capacitor unit, the PWM output end of the voltage stabilizing chip
A rectifier diode is connected, the voltage stabilizing chip connects metal-oxide-semiconductor by resistor-capacitor unit, and the metal-oxide-semiconductor rectifier diode is described whole
The negative terminal of stream diode is connect with luminescence unit.
Further, the luminescence display unit by four string light emitting diodes and display module form, light emitting diode by
The electric current of input is lighted, and display module shows the LVDS information of input.
Further, the resistor-capacitor unit is resistance R3.
Further, the voltage stabilizing chip and metal-oxide-semiconductor constitute amplifying circuit.
Further, the enable end of the voltage stabilizing chip is provided with a RC delay circuit.
Using technical solution as above, the display brightness for changing liquid crystal display by rotation knob is had the following beneficial effects:, from
Display brightness rotates knob counterclockwise when being 100%, display brightness drops to 10% from 100% with the speed of 5%/shelves, display
It is dimmed rapidly to shield brightness, continues rotation, brightness counterclockwise and drops to 1% with the speed of 1%/shelves, environment is set to Crape ring at this time
Brightness can be adjusted to the gear that a human eye is comfortable on the velocity variations of 0.2%/shelves by border, brightness.
Detailed description of the invention
Fig. 1 is the composition block diagram of the utility model；
Fig. 2 is the knob outline drawing of the utility model；
Fig. 3 is the electrical performance characteristics figure of the utility model；
Fig. 4 is the circuit diagram of the constant-current voltage-stabilizing unit of the utility model.
Specific embodiment
To keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, with reference to the accompanying drawing and implement
The technical solution of the utility model is clearly and completely described in example.
Referring to figs. 1 to Fig. 4, the utility model provides a kind of circuit of control brightness of display screen variation, including display control
Unit, constant-current voltage-stabilizing unit and luminescence display unit processed, the display control unit include control handle and processor composition, institute
It states the A foot being arranged on control handle and B foot is connect with processor, the processor and constant-current voltage-stabilizing unit and luminescence display unit
It being separately connected, the constant-current voltage-stabilizing unit is connected with luminescence display unit,
The constant-current voltage-stabilizing unit includes voltage stabilizing chip, metal-oxide-semiconductor and resistor-capacitor unit, the PWM output end of the voltage stabilizing chip
A rectifier diode is connected, the voltage stabilizing chip connects metal-oxide-semiconductor by resistor-capacitor unit, and the metal-oxide-semiconductor rectifier diode is described whole
The negative terminal of stream diode is connect with luminescence unit.
The luminescence display unit is made of four string light emitting diodes and display module, and light emitting diode is by the electric current that inputs
It lights, display module shows the LVDS information of input.
The resistor-capacitor unit is resistance R3.
The voltage stabilizing chip and metal-oxide-semiconductor constitute amplifying circuit.
The enable end of the voltage stabilizing chip is provided with a RC delay circuit, it is from the time of work is powered up to by this electricity
Road determines.
Among the above, the display control unit includes control handle and processor, and the shape of control handle is shown in Fig. 1, adds
Electric back spin rotates button, and the signal that the A foot and B human hair combing waste of knob go out is as shown in Fig. 2, the rising edge that processor passes through reading A foot and B foot
The sequencing of variation judges the direction of rotation of knob, and by the change frequency judgement rotation gear number of rising edge, processor is logical
The variable condition of knob is crossed, the PWM duty cycle for being sent to constant-current voltage-stabilizing unit is changed and is sent to the LVDS of display luminescence unit
Data；
In low intensity range, increases brightness gear, brightness fine tuning can be carried out under dark situation；In intermediate light range
It is interior, it is appropriate to increase brightness gear, brightness regulation can be carried out under intermediate light environment；In high intensity range, brightness is reduced
Gear can quickly lighten brightness of display screen under bright ring border；
Control handle is the knob of left and right directions unlimited rotary, and processor is triggered successive by reading knob A foot and B foot
Sequence judges left or right rotation, and the number judgement by reading height variation has rotated several grades, and the LVDS of output is determined with this
The brightness percentage information for including in signal.
Resistance R1 in constant-current voltage-stabilizing unit, resistance R2, triode Q1, rectifier diode D1 are by input voltage pressure stabilizing to 7.5V
Giving voltage stabilizing chip U1, capacitor C4 is shunt capacitance；Resistance R4 and capacitor C6 is used as delay voltage stabilizing chip U1 work；Capacitor C5 is anti-
Feed holds.Voltage stabilizing chip U1 for receiving the pwm signal of display control module transmission, and adjusts the PWM electric current received
Section keeps the electric current of output constant, and the ratio that actual current accounts for setting electric current value depends on the duty ratio of PWM.The 8 of voltage stabilizing chip U1
Foot exports corresponding pwm signal, voltage amplifier circuit is formed with metal-oxide-semiconductor, by stabilized input voltage to 60V；The 5 of voltage stabilizing chip U1
Foot is that output overvoltage detects foot, and when the voltage of 5 feet is greater than 1.55V, chip stops working, and the effect of capacitor C2 is to filter out partial pressure
In high-frequency signal, make detect voltage stabilization；The effect of inductance L1 is to stablize electric current, and instantaneous variation will not occur.
Luminescence display unit is the load of constant-current voltage-stabilizing unit, and luminous component is 4 light strings, while processor being sent
LVDS signal show.
It should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；To the greatest extent
Pipe is with reference to the foregoing embodiments described in detail the utility model, those skilled in the art should understand that: its
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equal
Replacement；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution various embodiments of the utility model technical side
The spirit and scope of case.
Claims (5)
1. it is a kind of control brightness of display screen variation circuit, which is characterized in that including display control unit, constant-current voltage-stabilizing unit and
Luminescence display unit, the display control unit include control handle and processor composition, the A foot being arranged on the control handle
It is connect with B foot with processor, the processor is separately connected with constant-current voltage-stabilizing unit and luminescence display unit, the constant-current voltage-stabilizing
Unit is connected with luminescence display unit,
The constant-current voltage-stabilizing unit includes voltage stabilizing chip, metal-oxide-semiconductor and resistor-capacitor unit, the PWM output end connection of the voltage stabilizing chip
One rectifier diode, the voltage stabilizing chip connect metal-oxide-semiconductor by resistor-capacitor unit, and the metal-oxide-semiconductor is connect with rectifier diode, described
The negative terminal of rectifier diode is connect with luminescence unit.
2. the circuit of control brightness of display screen variation according to claim 1, which is characterized in that the luminescence display unit
It is made of four string light emitting diodes and display module, light emitting diode is lighted by the electric current inputted, and display module is by input
LVDS information is shown.
3. the circuit of control brightness of display screen variation according to claim 1, which is characterized in that the resistor-capacitor unit is resistance
R3。
4. it is according to claim 1 control brightness of display screen variation circuit, which is characterized in that the voltage stabilizing chip and
Metal-oxide-semiconductor constitutes amplifying circuit.
5. the circuit of control brightness of display screen variation according to claim 1, which is characterized in that the voltage stabilizing chip makes
Energy end is provided with a RC delay circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920289780.4U CN209374038U (en) | 2019-03-07 | 2019-03-07 | A kind of circuit of control brightness of display screen variation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920289780.4U CN209374038U (en) | 2019-03-07 | 2019-03-07 | A kind of circuit of control brightness of display screen variation |
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| Publication Number | Publication Date |
|---|---|
| CN209374038U true CN209374038U (en) | 2019-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920289780.4U Active CN209374038U (en) | 2019-03-07 | 2019-03-07 | A kind of circuit of control brightness of display screen variation |
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| CN (1) | CN209374038U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115148161A (en) * | 2022-07-21 | 2022-10-04 | 远峰科技股份有限公司 | Automatic backlight adjusting method, device, equipment and storage medium |
-
2019
- 2019-03-07 CN CN201920289780.4U patent/CN209374038U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115148161A (en) * | 2022-07-21 | 2022-10-04 | 远峰科技股份有限公司 | Automatic backlight adjusting method, device, equipment and storage medium |
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