CN103412426B - A kind of liquid crystal display - Google Patents
A kind of liquid crystal display Download PDFInfo
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- CN103412426B CN103412426B CN201310319591.4A CN201310319591A CN103412426B CN 103412426 B CN103412426 B CN 103412426B CN 201310319591 A CN201310319591 A CN 201310319591A CN 103412426 B CN103412426 B CN 103412426B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a kind of liquid crystal display, in order to widen the low-temperature working scope of LCDs, guarantee that it normally can work and have response speed faster in low temperature environment.Described liquid crystal display comprises temperature control unit, temperature sensor and heater circuit, and temperature sensor is used for the temperature of LCDs to be transferred to temperature control unit; Temperature control unit is used for the temperature of the LCDs gathered according to temperature sensor, determines that whether controlling heater circuit is LCDs heating; Heater circuit, for the control according to temperature control unit, is LCDs heating.
Description
Technical field
The present invention relates to display technology field, particularly relate to a kind of liquid crystal display.
Background technology
LCDs is when environment temperature is lower than 0 DEG C, liquid crystal material will become thick, when temperature is lower, liquid crystal material is " crystallization " even, thus cause LCDs when cold-starting works, display frame variable color, brightness is low, occur " hangover " phenomenon, do not see figure at all, image shows, can not meet some special environment condition requirement time serious.
In order to make LCDs normally work at low temperatures, prior art proposed to heat in the liquid crystal of LCDs, but often caused liquid crystal outflow or reduction difficulty etc.Prior art also has a kind of mode in addition: the brightness improving LCDs, namely backlight lamp tube is increased, by development special high-pressure section at low temperatures (-40 DEG C) beat bright backlight lamp tube, wherein, this high-pressure section can produce the trigger voltage of 2000V ~ 3200V, and the huge thermal value produced by backlight lamp tube makes liquid crystal heat up, this mode is killed two birds with one stone, both solved the low-temperature working problem of liquid crystal, problem visual under solving again sunlight, this method is called for short: blast mode.
And aforesaid way has many hidden danger of quality: add many auxiliaries, reduce reliability; Assembling Production is got up and is comparatively bothered, and easily cause substandard products, defect rate is higher; The ability of device shock resistance, vibration declines; Aging speed is exceedingly fast, and rise in acceleration, particularly blast mode, the life-span only has 1/10 of ordinary life.
In addition, external existing individual businesses develops has higher cleaning point, the wide temperature liquid crystal material more consistent compared with change threshold property in wide temperature range of low viscosity coefficient, interior threshold voltage, but expensive due to it, not easily applies.
In addition, new type low temperature reinforced liquid crystal display screen achieves breakthrough technically, liquid crystal display module component internal can opened and under carrying out the prerequisite of well heater installation, just solve the Micro Energy Lose heating problems of LCDs, this kind of method can realize the low temperature display of LCDs, but LCDs internal temperature is uncontrollable when environment temperature changes, its usable range is subject to certain restrictions.
Summary of the invention
Embodiments provide a kind of liquid crystal display, in order to widen the low-temperature working scope of LCDs, guarantee that it normally can work and have response speed faster in low temperature environment.
According to a kind of liquid crystal display that the embodiment of the present invention provides, described liquid crystal display comprises: temperature control unit, temperature sensor and heater circuit, and temperature sensor is used for the temperature of LCDs to be transferred to temperature control unit; Temperature control unit is used for the temperature of the LCDs gathered according to temperature sensor, controls heater circuit work, and namely whether temperature control unit is opened according to the temperature value control heater circuit of the LCDs according to temperature sensor collection; Heater circuit, for the control according to temperature control unit, is LCDs heating.
The described liquid crystal display provided by the embodiment of the present invention, this liquid crystal display can realize LCDs in extremely low temperature range and work, automatically can control the temperature in LCDs when external environment converts, do not need manual control, adaptive capacity to environment is strong.
Preferably, described heater circuit comprises: switching device, well heater and power supply, and wherein, switching device is controlled by temperature control unit, makes power supply be heating installation power supply when closing, and well heater starts heating.
Like this, when described well heater starts to heat, the low-temperature working scope of LCDs can be widened.
Preferably, described heater circuit also comprises the fuse between plant-grid connection point and well heater.
Like this, described fuse is used for the protection of excess current, can effectively prevent the device in heater circuit to be burned.
Preferably, described switching device is the first transistor, and described heater circuit also comprises the first resistance, and this first resistance is connected between plant-grid connection point and the grid of the first transistor, the grid of the first transistor is connected with temperature control unit, and two-stage is connected with earth point with well heater respectively in addition.
Like this, the first transistor that described grid is connected with temperature control unit plays the effect of switch, and transistor is as switching device; convenient and simple, be convenient to realize, wherein; with the first resistance as shunt resistance, can protective current excessive and burn out device, simultaneously also simple.
Preferably, described heater circuit also comprises the first electric capacity and the second resistance, and the first electric capacity and the second resistance are connected between first crystal tube grid and earth point.
Like this, the RC circuit be made up of the first electric capacity and the second resistance increases the switching signal conducting of the first transistor and the time of shutoff, alleviates the impact of heater circuit to feed circuit.
Preferably, described heater circuit also comprises transistor seconds, and its grid is connected with temperature control unit, and two-stage is connected with the grid of the first transistor with earth point respectively in addition.
Like this, described transistor seconds is identical with the effect of the first transistor, is the switching device in heater circuit, simple in the design of heater circuit.
Preferably, described heater circuit also comprises the second electric capacity and the 3rd resistance, and wherein the 3rd resistance is connected between temperature control unit and the grid of transistor seconds, and the second electric capacity is connected between the grid of transistor seconds and earth point.
Like this, by the 3rd resistance be connected between temperature control unit and the grid of transistor seconds be connected to RC circuit that the second electric capacity between the grid of transistor seconds and earth point forms can play filtering, voltage stabilizing effect to whole heater circuit.
Preferably, described well heater is positioned at LCDs inside.
Like this, well heater is positioned at LCDs inside, is easy to control, and cost is low and simple, need not dismantle LCDs, improves the reliability of display.
Preferably, described heater circuit comprises multiple well heater, wherein, connected in series or in parallel between multiple well heater, lays respectively at the diverse location of LCDs inside.
Like this, the well heater being positioned at the inner diverse location of LCDs can heat uniformly for LCDs.
Preferably, described liquid crystal display comprises multiple temperature sensor be connected with described temperature control unit respectively, is positioned at the diverse location of LCDs inside.
Like this, the temperature sensor being positioned at the inner diverse location of LCDs can collect temperature value more accurately.
Accompanying drawing explanation
A kind of liquid crystal display schematic diagram that Fig. 1 provides for the embodiment of the present invention one;
The another kind of liquid crystal display schematic diagram that Fig. 2 provides for the embodiment of the present invention two.
Embodiment
Embodiments provide a kind of liquid crystal display, in order to widen the low-temperature working scope of LCDs, guarantee that it normally can work and have response speed faster in low temperature environment.
Provide the detailed introduction of the technical scheme that the embodiment of the present invention provides below.
Embodiment one:
As shown in Figure 1, a kind of liquid crystal display that the embodiment of the present invention provides, described liquid crystal display comprises: temperature control unit 10, temperature sensor 12 and heater circuit 13, and temperature sensor 12 is for being transferred to temperature control unit 10 by the temperature of LCDs 14; The temperature of LCDs 14 of temperature control unit 10 for gathering according to temperature sensor 12, determines that whether controlling heater circuit 13 heats for LCDs 14; Heater circuit 13, for the control according to temperature control unit 10, for LCDs 14 heats.
Preferably, described heater circuit 13 comprises: switching device Q, well heater L and power supply 11, and wherein, switching device Q is controlled by temperature control unit 10, makes power supply 11 power for well heater L when closing, and well heater L starts to heat.
Wherein, switching device Q is transistor, and the grid of transistor Q is connected with temperature control unit 10, and two-stage is connected with earth point with well heater L respectively in addition, and one end of well heater L is connected with power supply 11, and the other end is connected with transistor Q.
Preferably, described well heater L is positioned at LCDs 14 inside.
Preferably, described heater circuit 13 comprises multiple well heater L, lays respectively at the diverse location of LCDs 14 inside, wherein can be connected in series between multiple well heater, also can be connected in parallel.
Preferably, described liquid crystal display comprises multiple temperature sensor 12 be connected with temperature control unit 10 respectively, lays respectively at the diverse location of LCDs 14 inside.
Embodiment two:
As shown in Figure 2, the liquid crystal display that another embodiment of the present invention provides, described liquid crystal display comprises: temperature control unit 20, temperature sensor 22 and heater circuit 23, and temperature sensor 22 is for being transferred to temperature control unit 20 by the temperature of LCDs 24; The temperature of LCDs 24 of temperature control unit 20 for gathering according to temperature sensor 22, determines that whether controlling heater circuit 23 heats for LCDs 24; Heater circuit 23, for the control according to temperature control unit 20, for LCDs 24 heats.
Preferably, the temperature control unit 20 in the embodiment of the present invention is single-chip microcomputer.
Preferably, described heater circuit 23 comprises: switching device Q1, well heater L and power supply 21, and wherein, switching device Q1 is controlled by temperature control unit 20, makes power supply 21 power for well heater L when closing, and well heater L starts to heat.
Preferably, described heater circuit 23 also comprises the fuse F between power supply 21 access point and well heater L.
Preferably, described switching device Q1 is the first transistor Q1, described heater circuit 23 also comprises the first resistance R1, this first resistance R1 is connected between the grid of power supply 21 access point and the first transistor Q1, the grid of the first transistor Q1 is connected with temperature control unit 20, and two-stage is connected with earth point with well heater L respectively in addition.
Preferably, described heater circuit 23 also comprises the first electric capacity C1 and the second resistance R2, and the first electric capacity C1 and the second resistance R2 is connected between the first transistor Q1 grid and earth point.First electric capacity C1 and the second resistance R2 forms a RC protection circuit.
Preferably, described heater circuit 23 also comprises transistor seconds Q2, its grid is connected with temperature control unit 20, two-stage is connected with the grid of earth point with the first transistor Q1 respectively in addition, wherein, transistor seconds Q2 can be also triode, and its base stage is connected with temperature control unit 20, emitter is connected with earth point, and collector is connected with the grid of the first transistor Q1.
Preferably, described heater circuit 23 also comprises the second electric capacity C2 and the 3rd resistance R3, and wherein the 3rd resistance R3 is connected between the grid of temperature control unit 20 and transistor seconds Q2, between the grid that the second electric capacity C2 is connected to transistor seconds Q2 and earth point.Second electric capacity C2 and the 3rd resistance R3 forms another RC protection circuit.
Preferably, described well heater L is positioned at LCDs 24 inside.
Wherein, metal place below the sealing frame (BM) of unit (cell) part of well heater L specific design in LCDs 24 inside, make temperature control more accurate, more effective, certainly, the putting position of well heater L need be determined according to actual tests result, can arrange multiple well heater L, be evenly distributed in the diverse location of LCDs 24 inside, more even to make the heating of LCDs 24.
Wherein, well heater L can adopt the electron devices such as heating resistor.
Preferably, described liquid crystal display comprises multiple temperature sensor 22, lay respectively at the diverse location of LCDs 24 inside, for gathering the temperature of multiple positions of LCDs 24, input to temperature control unit 20, make temperature control unit 20 can calculate the medial temperature of LCDs 24, medial temperature and predetermined threshold value is utilized to compare, when lower than the first threshold preset, namely transmit control signal to heater circuit, control heater circuit to heat LCDs 24, when the medial temperature of LCDs 24 is higher than the Second Threshold preset, then stop controlling heater circuit to heat LCDs 24, the temperature control of such realization can be more accurate.Wherein, first threshold is less than Second Threshold, and concrete value can be arranged according to actual needs.
Preferably, the temperature sensor 22 in the embodiment of the present invention designs in the position that can represent the inner medial temperature of LCDs 24, and temperature sensor 22 can adopt thin film transistor (TFT) or thermistor design.
In embodiment provided by the invention, the temperature control unit 20 shown in Fig. 2 is single-chip microcomputer, and it has the function receiving command signal, judge and send signal instruction to signal.Can judge the temperature of LCDs 24 according to the value of temperature sensor 22, control heater L heats, in temperature range LCDs being in all the time can work.
AD7416 selected by temperature sensor 22 in the embodiment of the present invention, its volume is little, programming is simple, comprise a Band-gap Temperature Sensor and one be used for monitoring and by digitized for the height of temperature 10 AD sensors, also have a programmable thresholding to be used for comparing and measuring temperature.Internal register can be used for setting high and low temperature threshold, and provide " the overtemperature indicator " of an open-drain to export, export effectively when exceeding the thresholding of setting, certainly, temperature sensor herein can also be the temperature sensor of other model, and is not limited to embodiment of the present invention temperature sensor used.
The liquid crystal display implement body provided below in conjunction with the embodiment of the present invention two introduces its course of work:
As shown in Figure 2, when ambient temperature is too low, the temperature of LCDs 24 also can be too low and cause its operation irregularity, when the medial temperature of single-chip microcomputer perception LCDs 24 is lower than the first threshold preset, the well heater L of primer fluid crystal display screen 24 inside, continuous heater riser temperature, when the medial temperature of LCDs 24 is higher than the Second Threshold preset, then turns off well heater L.
Particularly, single-chip microcomputer is first according to the temperature in the LCDs of temperature sensor 22 collection, judge the working temperature of LCDs 24, when LCDs 24 operating ambient temperature is lower than 0 DEG C, heater circuit 23 works, when LCDs 24 working temperature is between 0 DEG C and 20 DEG C, if now heater circuit 23 heats, then continue heating, if current heater circuit 23 does not heat, then without the need to heating.When LCDs 24 working temperature is higher than 20 DEG C, then heater circuit 23 stops heating.
As shown in Figure 2, when the temperature of temperature sensor 22 perception LCDs 24 is too low (when environment temperature is too low, the temperature of LCDs also can be too low and cause operation irregularity), temperature signal is passed to single-chip microcomputer by temperature sensor 22, single-chip microcomputer sends enabling signal by instruction, the first transistor Q1 and transistor seconds Q2 opens, well heater L starts working, continuous heater riser temperature, after reaching temperature reservation, single-chip microcomputer accepts the instruction of temperature sensor 22, exports cut-off signals, the first transistor Q1 and transistor seconds Q2 closes, and turns off well heater L.
Meanwhile, the RC circuit be made up of the second electric capacity C2 and the 3rd resistance R3 increases the switching signal conducting of the first transistor Q1 and the time of shutoff, alleviates the impact of heater circuit to feed circuit.
In order to the better working temperature to LCDs 24 controls, can programme more specifically to single-chip microcomputer, stricter control being realized to LCDs 24 working environment, as reduced operating temperature range, making LCDs 24 continue to remain in rational temperature range.In addition, single-chip microcomputer also can carry out communication, the builtin voltage of adjustable liquid crystal display display screen 24 with LCDs 24.
Temperature control unit and LCDs outside adopt thermal insulation material to make attemperator, by attemperator by these heat storage and accumulating, LCDs normally can be worked at low temperatures, can reduce the power consumption of well heater like this.Wherein, attemperator can carry out specific design according to actual conditions, as vacuum heat-preserving, and material insulation etc.
The liquid crystal display that the embodiment of the present invention one provides is the simple mechanism figure of the liquid crystal display that the embodiment of the present invention two provides, certainly, heater circuit in liquid crystal display is not limited to these two kinds of heater circuits that the embodiment of the present invention provides, as: raster data model is accomplished (Gate On Glass on glass, gate drive voltage too low phenomenon is easily there is during LCDs cold-starting GOA), can add gate drive voltage temperature-compensation circuit, the liquid crystal display provided with the embodiment of the present invention combines together simultaneously.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (7)
1. a liquid crystal display, is characterized in that, described liquid crystal display comprises temperature control unit, temperature sensor and heater circuit, and temperature sensor is used for the temperature of LCDs to be transferred to temperature control unit; Temperature control unit is used for the temperature of the LCDs gathered according to temperature sensor, controls heater circuit work; Heater circuit, for the control according to temperature control unit, is LCDs heating; Described heater circuit comprises: switching device, well heater, power supply, the second electric capacity and the 3rd resistance, and wherein, switching device is controlled by temperature control unit, makes power supply be heating installation power supply when closing, and well heater starts heating; Wherein:
Described switching device comprises the first transistor and transistor seconds, and the grid of described transistor seconds is connected with temperature control unit, and two-stage is connected with the grid of the first transistor with earth point respectively in addition; The other two-stage of described the first transistor is connected with earth point with well heater respectively;
Described 3rd resistance is connected between temperature control unit and the grid of transistor seconds;
Described second electric capacity is connected between the grid of transistor seconds and earth point.
2. liquid crystal display according to claim 1, is characterized in that, described heater circuit also comprises the fuse between plant-grid connection point and well heater.
3. liquid crystal display according to claim 2, is characterized in that, described heater circuit also comprises the first resistance, and this first resistance is connected between plant-grid connection point and the grid of the first transistor.
4. liquid crystal display according to claim 3, is characterized in that, described heater circuit also comprises the first electric capacity and the second resistance, and the first electric capacity and the second resistance are connected between first crystal tube grid and earth point.
5. liquid crystal display according to claim 4, is characterized in that, described well heater is positioned at LCDs inside.
6. liquid crystal display according to claim 5, is characterized in that, described heater circuit comprises multiple well heater, wherein, connected in series or in parallel between multiple well heater, lays respectively at the diverse location of LCDs inside.
7. liquid crystal display according to claim 1, is characterized in that, described liquid crystal display comprises multiple temperature sensor be connected with described temperature control unit respectively, is positioned at the diverse location of LCDs inside.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310319591.4A CN103412426B (en) | 2013-07-26 | 2013-07-26 | A kind of liquid crystal display |
| PCT/CN2013/086241 WO2015010383A1 (en) | 2013-07-26 | 2013-10-30 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310319591.4A CN103412426B (en) | 2013-07-26 | 2013-07-26 | A kind of liquid crystal display |
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| CN103412426A CN103412426A (en) | 2013-11-27 |
| CN103412426B true CN103412426B (en) | 2015-09-09 |
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| CN201310319591.4A Active CN103412426B (en) | 2013-07-26 | 2013-07-26 | A kind of liquid crystal display |
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| CN (1) | CN103412426B (en) |
| WO (1) | WO2015010383A1 (en) |
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| CN104714325B (en) * | 2015-03-18 | 2017-09-19 | 深圳市华星光电技术有限公司 | Liquid crystal display and preparation method thereof |
| CN106814486B (en) * | 2015-11-30 | 2020-10-13 | 惠州市德赛西威汽车电子股份有限公司 | LCD screen capable of displaying at low temperature and heating method thereof |
| CN106004728A (en) * | 2016-06-29 | 2016-10-12 | 四川莱源科技有限公司 | Vehicle safety radar early-warning terminal |
| CN106183972A (en) * | 2016-06-29 | 2016-12-07 | 四川莱源科技有限公司 | Slotted waveguide antenna for radar monitoring |
| CN106226933B (en) * | 2016-08-30 | 2019-04-05 | 京东方科技集团股份有限公司 | Feed circuit, heater circuit, display device and display system |
| CN109496278A (en) * | 2017-05-08 | 2019-03-19 | 京东方科技集团股份有限公司 | Display base plate, liquid crystal display panel, liquid crystal display device and its operating method |
| CN107103881B (en) * | 2017-06-20 | 2019-03-05 | 武汉天马微电子有限公司 | A kind of display panel brightness adjusting method and display device |
| CN108646450A (en) * | 2018-04-23 | 2018-10-12 | 深圳市华星光电半导体显示技术有限公司 | A kind of heating system and heating means of display panel |
| CN108761930B (en) * | 2018-05-18 | 2021-11-09 | 上海天马微电子有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN112612154A (en) * | 2019-10-03 | 2021-04-06 | 群创光电股份有限公司 | Liquid crystal device having a plurality of liquid crystal cells |
| CN112693311B (en) * | 2021-01-11 | 2022-04-08 | 安徽天健环保车辆部件有限公司 | Intelligent temperature control system of full liquid crystal combination instrument |
| CN113075820A (en) * | 2021-03-31 | 2021-07-06 | 联想(北京)有限公司 | Display device, control method and optical module |
| GB2621824A (en) * | 2022-08-19 | 2024-02-28 | Continental Automotive Tech Gmbh | A vehicle display apparatus integrated with a temperature regulator |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN103412426A (en) | 2013-11-27 |
| WO2015010383A1 (en) | 2015-01-29 |
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