CN105871196A - Power supply circuit of display screen and method for solving low color temperature of power supply circuit in low-temperature environment - Google Patents
Power supply circuit of display screen and method for solving low color temperature of power supply circuit in low-temperature environment Download PDFInfo
- Publication number
- CN105871196A CN105871196A CN201610203174.7A CN201610203174A CN105871196A CN 105871196 A CN105871196 A CN 105871196A CN 201610203174 A CN201610203174 A CN 201610203174A CN 105871196 A CN105871196 A CN 105871196A
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- China
- Prior art keywords
- resistance
- power supply
- display screen
- temperature
- supply circuits
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a power supply circuit of a display screen and a method for solving low color temperature of the power supply circuit in a low-temperature environment. The power supply circuit comprises a power supply conversion chip, a temperature sensor and a configuration resistor, wherein the power supply conversion chip is connected with the temperature sensor and the configuration resistor which are connected in series so as to achieve voltage division, the resistance of the temperature sensor can be gradually increased with the temperature rise, an output end of the power supply conversion chip is connected with an LED lamp and a RGB lamp of the LED display screen, and the LED lamp and the RGB lamp are connected in series. By the power supply circuit of the display screen, the demand of the RGB colored lamp on voltage in a low temperature can be met, and the problem of low color temperature of the display screen in the low-temperature environment is solved by the method, and the display screen is clearer.
Description
Technical field
The present invention relates to the use field of display screen, in particular it relates to display screen power supply circuits and use are aobvious
Display screen power supply circuits solve the method that under its low temperature environment, colour temperature is on the low side.
Background technology
Electronic display technology be means electronically by various signals with word, symbol, figure, image
Form be committed to the technology at visual angle of people.And electron display device is divided into active illuminant and non-active
The big class of light type two.The former is luminosity and the color utilizing information to modulate each pixel, and then directly shows
Show.The latter itself is the most luminous, but utilizes modulates information light source to reach the purpose of display.And it is current
Military liquid crystal display uses the latter mostly, i.e. utilizes LCDs to add backlight to obtain display effect
's.
It is known that the information that various display devices show supplies the eyes viewing of people, the physiological feature of human eye
Have a great impact formulating range of information.Currently in order to meet the requirement of user's colour temperature and chromaticity coordinates mostly
Use white light (LED) and color lamp RGB hybrid backlight source technology.Owing to LED is a kind of quasiconductor
Luminescent device, luminous efficiency is low, and much electricity is converted to heat energy, produces junction temperature.Along with LED junction temperature
Rising can cause the change of LED light, electricity and thermal property, LED forward voltage values Vf
Also can decline.And at low ambient temperatures, needed for LED, forward voltage values Vf increases.Thus cause color lamp
Diminishing of LED current.
And the color LED backlight in LCD MODULE is due to the change of electric current, directly result in height
The change of color under temperature environment.Thus causing the change of colour temperature, current display color temperature typically requires regulation
For 6500K, photochromic the most blue, colour temperature is the highest, and photochromic the reddest, colour temperature is the lowest, due to color lamp LED
In (GB) green light and blue lamp required voltage at low ambient temperatures can increase, color lamp RGB lamp is just
Pole uses just to be designed altogether, and according to the characteristic of lamp, the orange lamp efficiency in color lamp RGB is high, required voltage
Significantly lower than blue lamp and green light.The most unaffected.And green, blue light required voltage at low temperatures
Higher than room temperature.Power consumption is caused to become big if voltage configuration is too high, if configuration is normal, will be because of under low temperature
Voltage causes coloured light to die down not, and red light component reddens relatively.Colour temperature is on the low side.(such as fly to user
Office staff) bring color-vision-deviant and discomfort.
Summary of the invention
It is an object of the invention to provide colour temperature under a kind of display screen power supply circuits and its low temperature environment of solution inclined
Low method, these display screen power supply circuits meet the RGB color lamp demand to voltage under low temperature, solve aobvious
The method that under display screen low temperature environment, colour temperature is on the low side achieves display screen and becomes apparent from.
To achieve these goals, the invention provides a kind of display screen power supply circuits, this power supply circuits bag
Including: power conversion chip, temperature sensor and configuration resistance, described power conversion chip is connected to go here and there mutually
The described temperature sensor of connection and configuration resistance are to realize dividing potential drop, and the resistance of described temperature sensor can be with
The rising temperature is gradually increased, and the outfan of described power conversion chip is connected to LED display
The LED being in series and RGB lamp.
Preferably, the model of described power conversion chip is the power conversion chip of LM22677-ADJ.
Preferably, described configuration resistance includes the 85th resistance, the 89th resistance and the 92nd electricity
Resistance, described 92nd resistance, the 89th resistance, temperature sensor, the 85th resistance and depend on
Secondary connection, the 6th pin of described power conversion chip is connected to described 89 resistance and temperature sensor
Between.
Preferably, the second pin of described power conversion chip is connected to 28V power supply, and respectively by the
50 capacity earths and the 54th capacity earth.
Preferably, the 5th pin of described power conversion chip passes through the 93rd resistance eutral grounding, described electricity
8th pin of source conversion chip and the 4th pin ground connection.
Preferably, the 3rd pin of described power conversion chip passes sequentially through the 53rd electric capacity and the 50th
Six capacity earths.
Preferably, the first pin of described power conversion chip is connected to described 53rd electric capacity and the 5th
Between 16 electric capacity, and by the 6th diode reverse ground connection；First pin of described power conversion chip
Also by the first inductance connection in described 92nd resistance away from one end of described 89th resistance, institute
State the output that one end is described power conversion chip away from described 89th resistance of the 92nd resistance
End.
Preferably, described 92nd resistance passes through the 5th respectively away from one end of described 89th resistance
17 electric capacity, the 58th electric capacity, the 55th electric capacity, the 81st electric capacity and the 59th electric capacity connect
Ground.
Preferably, the resistance of described 85th resistance is 680 Ω, the resistance of described 89th resistance
Being 100 Ω, the resistance of described 92nd resistance is 7.5K Ω.
Preferably, the method includes: use LED display power supply circuits to the string mutually of LED display
LED and the RGB lamp of connection are powered.
By the way of above-mentioned, a kind of temperature sensor is used to belong to positive temperature coefficient, i.e. along with temperature
Raising, resistance is also raising, and utilizes this feature supplements LED required under high and low temperature environment
Magnitude of voltage, changes the ratio that turquoise lamp is luminous, and then has reached stable color temperature purpose.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, with
Detailed description below is used for explaining the present invention together, but is not intended that limitation of the present invention.?
In accompanying drawing:
Fig. 1 is the circuit diagram of a kind of display screen power supply circuits that the present invention is described；
Fig. 2 is the temperature curve chart with resistance corresponding relation of the temperature sensor that the present invention is described.
Detailed description of the invention
Below in conjunction with accompanying drawing, the detailed description of the invention of the present invention is described in detail.It should be appreciated that
Detailed description of the invention described herein is merely to illustrate and explains the present invention, is not limited to this
Bright.
The present invention provides a kind of display screen power supply circuits, and these power supply circuits include: power conversion chip, temperature
Degree sensor and configuration resistance, described power conversion chip be connected to the described temperature sensor that is in series and
Configuration resistance is to realize dividing potential drop, and the resistance of described temperature sensor gradually can increase along with the rising of temperature
Add, the outfan of described power conversion chip be connected to LED display the LED being in series and
RGB lamp.
First passing through power conversion chip generation voltage color lamp altogether to power, backlight uses white lamp+RGB color
The design of lamp, uses Switching Power Supply to be driven, and the positive pole of the white lamp of LED and redgreenblue lamp is altogether one
Rise, all have power conversion chip output voltage to supply.It is corresponding under normal temperature environment when being configured so that resistance
LED required for forward voltage drop.Voltage required at low temperatures will raise that (LED characteristic is certainly
Fixed).The electric current flowing to LED is caused to reduce.Now by serial temperature sensor and configuration resistant series,
At low temperature environment, utilizing temperature sensor resistance conversion characteristics, temperature sensor is positive temperature coefficient sensing
Device.Rise high value with temperature to increase.
Show that VOUT=(1+R2/R1) * 1.285 can draw output electricity according to power conversion chip characteristic
Press along with the change of temperature sensor resistance has difference.R2=R89+R92 in this example；
R1=R85+PT100.
Under-50 DEG C of environment of low temperature, resistance corresponding to temperature sensor is 80 Ω, corresponding output voltage
For 14.2V, and during room temperature 25 DEG C, output voltage is 13.5V.Backlight color lamp RGB employing four is a string
Assigning to the pressure drop on each lamp is 3V.It is about 3.15V under low temperature and meets under low temperature RGB color lamp to voltage
Demand.
Below in conjunction with accompanying drawing 1 and accompanying drawing 2, the present invention is further detailed, in order to improve the present invention
The scope of application, use especially following detailed description of the invention to realize.
In a kind of detailed description of the invention of the present invention, the model of described power conversion chip is
The power conversion chip of LM22677-ADJ.Three primary colours can be regulated by above-mentioned power conversion chip
RGB current ratio.
In this kind of embodiment, described configuration resistance include the 85th resistance, the 89th resistance and
92nd resistance, described 92nd resistance, the 89th resistance, temperature sensor, the 85th
Resistance and ground be sequentially connected with, the 6th pin of described power conversion chip be connected to described 89 resistance with
Between temperature sensor.Wherein, the resistance of described 85th resistance is 680 Ω, the described 89th
The resistance of resistance is 100 Ω, and the resistance of described 92nd resistance is 7.5K Ω, carries out dividing potential drop respectively.
Temperature sensor uses PT100, under-50 DEG C of environment of low temperature, resistance corresponding to temperature sensor for for
80 Ω, corresponding output voltage is 14.2V, and during room temperature 25 DEG C, output voltage is 13.5V.Backlight is color
Lamp RGB uses four a string pressure drops assigned on each lamp to be 3V.It is about 3.15V under low temperature and meets low
The lower RGB color lamp demand to voltage of temperature, makes green light and blue lamp component increase.Thus solve because of low temperature
The reddest phenomenon of LCDs (i.e. colour temperature is on the low side) that lower green light, blue lamp component reduce and cause.
In this kind of embodiment, the second pin of described power conversion chip is connected to 28V power supply, and
Respectively by the 50th capacity earth and the 54th capacity earth.28V power supply is supply voltage.
In this kind of embodiment, the 5th pin of described power conversion chip is connect by the 93rd resistance
Ground, the 8th pin of described power conversion chip and the 4th pin ground connection.93rd resistance is 169K
Ω。
In this kind of embodiment, the 3rd pin of described power conversion chip passes sequentially through the 53rd electricity
Hold and the 56th capacity earth.
In this kind of embodiment, the first pin of described power conversion chip is connected to the described 53rd
Between electric capacity and the 56th electric capacity, and by the 6th diode reverse ground connection；Described power conversion chip
The first pin also by the first inductance connection in described 92nd resistance away from described 89th electricity
One end of resistance, described 92nd resistance is described Power convert away from one end of described 89th resistance
The outfan of chip.
In this kind of embodiment, described 92nd resistance divides away from one end of described 89th resistance
Tong Guo the 57th electric capacity, the 58th electric capacity, the 55th electric capacity, the 81st electric capacity and the 5th
19 capacity earths.
In this kind of embodiment, the resistance of described 85th resistance is 680 Ω, the described 89th
The resistance of resistance is 100 Ω, and the resistance of described 92nd resistance is 7.5K Ω.
The present invention also provides for a kind of solving the method that under display screen low temperature environment, colour temperature is on the low side, the method bag
Include: use LED display power supply circuits to the LED being in series of LED display and RGB lamp
Power supply.The circuit of the present invention is simple, it is possible to solves liquid crystal display screen low temperature colour temperature problem on the low side, improves picture
Display quality, improves for user and clearly indicates effect.According to the characteristic of lamp, institute in RGB color lamp
The forward voltage drop needed raises at low temperatures, at high temperature reduces, and blue lamp forward voltage drop is with high/low temperature change song
Line is for being gradually lowered, and owing to red light effect is higher, under whole high and low temperature environment, required voltage is obvious
Less than green light and blue modulating voltage, so the most unaffected, green light change curve is with blue lamp.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, but, the present invention does not limit
Detail in above-mentioned embodiment, in the technology concept of the present invention, can be to the present invention
Technical scheme carry out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technology described in above-mentioned detailed description of the invention is special
Levy, in the case of reconcilable, can be combined by any suitable means, in order to avoid need not
The repetition wanted, various possible compound modes are illustrated by the present invention the most separately.
Additionally, combination in any can also be carried out between the various different embodiment of the present invention, as long as its
Without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (10)
1. display screen power supply circuits, it is characterised in that these power supply circuits include: Power convert core
Sheet, temperature sensor and configuration resistance, the described temperature that described power conversion chip is connected to be in series passes
Sensor and configuration resistance to realize dividing potential drop, the resistance of described temperature sensor can along with the rising of temperature by
Cumulative adding, the outfan of described power conversion chip is connected to the LED being in series of LED display
With RGB lamp.
Display screen power supply circuits the most according to claim 1, it is characterised in that described power supply turns
Change the power conversion chip that model is LM22677-ADJ of chip.
Display screen power supply circuits the most according to claim 2, it is characterised in that described configuration electricity
Hinder and include the 85th resistance, the 89th resistance and the 92nd resistance, described 92nd resistance,
89th resistance, temperature sensor, the 85th resistance and be sequentially connected with, described Power convert core
6th pin of sheet is connected between described 89 resistance and temperature sensor.
Display screen power supply circuits the most according to claim 2, it is characterised in that described power supply turns
The second pin changing chip is connected to 28V power supply, and respectively by the 50th capacity earth and the 54th
Capacity earth.
Display screen power supply circuits the most according to claim 2, it is characterised in that described power supply turns
Change the 5th pin of chip by the 93rd resistance eutral grounding, the 8th pin of described power conversion chip and
4th pin ground connection.
Display screen power supply circuits the most according to claim 3, it is characterised in that described power supply turns
The 3rd pin changing chip passes sequentially through the 53rd electric capacity and the 56th capacity earth.
Display screen power supply circuits the most according to claim 6, it is characterised in that described power supply turns
The first pin changing chip is connected between described 53rd electric capacity and the 56th electric capacity, and by the
Six diode reverse ground connection；First pin of described power conversion chip also by the first inductance connection in institute
Stating the 92nd resistance one end away from described 89th resistance, described 92nd resistance is away from described
The outfan that one end is described power conversion chip of the 89th resistance.
Display screen power supply circuits the most according to claim 3, it is characterised in that the described 90th
Two resistance pass through the 57th electric capacity, the 58th electricity respectively away from one end of described 89th resistance
Appearance, the 55th electric capacity, the 81st electric capacity and the 59th capacity earth.
Display screen power supply circuits the most according to claim 1, it is characterised in that the described 80th
The resistance of five resistance is 680 Ω, and the resistance of described 89th resistance is 100 Ω, the described 92nd
The resistance of resistance is 7.5K Ω.
10. one kind solves the method that under display screen low temperature environment, colour temperature is on the low side, it is characterised in that the method
Including: use LED display power supply circuits to the LED being in series of LED display and RGB
Lamp is powered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610203174.7A CN105871196A (en) | 2016-04-05 | 2016-04-05 | Power supply circuit of display screen and method for solving low color temperature of power supply circuit in low-temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610203174.7A CN105871196A (en) | 2016-04-05 | 2016-04-05 | Power supply circuit of display screen and method for solving low color temperature of power supply circuit in low-temperature environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105871196A true CN105871196A (en) | 2016-08-17 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610203174.7A Pending CN105871196A (en) | 2016-04-05 | 2016-04-05 | Power supply circuit of display screen and method for solving low color temperature of power supply circuit in low-temperature environment |
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| CN (1) | CN105871196A (en) |
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|---|---|---|---|---|
| CN101043773A (en) * | 2006-03-20 | 2007-09-26 | 斯坦雷电气株式会社 | LED drive circuit |
| CN101297604A (en) * | 2005-10-26 | 2008-10-29 | 皇家飞利浦电子股份有限公司 | LED luminary system |
| CN103869866A (en) * | 2012-12-14 | 2014-06-18 | 力智电子股份有限公司 | Reference voltage generator of grid drive circuit and reference voltage generating method |
| CN104302065A (en) * | 2014-10-31 | 2015-01-21 | 浙江大学 | A LED driver with autonomous temperature regulation and compensation function |
| CN104570472A (en) * | 2013-10-10 | 2015-04-29 | 乐金显示有限公司 | Liquid crystal display device |
-
2016
- 2016-04-05 CN CN201610203174.7A patent/CN105871196A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101297604A (en) * | 2005-10-26 | 2008-10-29 | 皇家飞利浦电子股份有限公司 | LED luminary system |
| CN101043773A (en) * | 2006-03-20 | 2007-09-26 | 斯坦雷电气株式会社 | LED drive circuit |
| CN103869866A (en) * | 2012-12-14 | 2014-06-18 | 力智电子股份有限公司 | Reference voltage generator of grid drive circuit and reference voltage generating method |
| CN104570472A (en) * | 2013-10-10 | 2015-04-29 | 乐金显示有限公司 | Liquid crystal display device |
| CN104302065A (en) * | 2014-10-31 | 2015-01-21 | 浙江大学 | A LED driver with autonomous temperature regulation and compensation function |
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Application publication date: 20160817 |
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