CN102563470A - High-brightness temperature-adaptive direct-type cold cathode fluorescent lamp liquid crystal backlight module - Google Patents
High-brightness temperature-adaptive direct-type cold cathode fluorescent lamp liquid crystal backlight module Download PDFInfo
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- CN102563470A CN102563470A CN2012100396584A CN201210039658A CN102563470A CN 102563470 A CN102563470 A CN 102563470A CN 2012100396584 A CN2012100396584 A CN 2012100396584A CN 201210039658 A CN201210039658 A CN 201210039658A CN 102563470 A CN102563470 A CN 102563470A
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Abstract
The invention discloses a high-brightness temperature-adaptive direct-type cold cathode fluorescent lamp or external electrode fluorescent lamp (CCFL or EEFL) liquid crystal backlight module. The liquid crystal backlight module comprises a casing, a cold cathode fluorescent lamp array mounted in the casing, a diffuser arranged above the light emitting lamp array, and a reflector plate arranged below the light emitting lamp array. The liquid crystal backlight module is characterized in that the reflector plate is composed of a heat-radiating reflector plate, on which recesses and bosses for reflecting light and increasing the heat radiation area are distributed; a brightness and temperature active control system is arranged below the casing, and is provided with a refrigeration semiconductor array, an external cooling fin, a temperature sensor, a radiator, and a backlight module intelligent controller composed of a CPU; and the temperature sensor, a refrigeration semiconductor array driver and a light emitting lamp array driver are connected with the backlight module intelligent controller. The liquid crystal backlight module provided by the invention solves the conflict in improving brightness of a liquid crystal screen and controlling temperature of the backlight module so as to obviate burning out or loss of service life of the liquid crystal screen, and also prevents freezing damage to the liquid crystal screen, thereby widening the application fields of the liquid crystal screen.
Description
Technical field
The present invention relates to a kind of high brightness temperature self-adaptation straight-down negative cathode fluorescent tube LCD backlight module, is a kind of parts of producing or reequiping liquid crystal display, belongs to technical field of liquid crystal display.
Background technology
Because liquid crystal LCD itself is not luminous; The module backlight of liquid crystal display is the light source supplier of liquid crystal display.Under the certain prerequisite of the light transmittance of liquid crystal own, light intensity that module backlight provides or brightness are high more, and the liquid crystal display picture displayed is bright more.
Adopting the directly-down liquid crystal backlight module of cathode fluorescent tube (referring to: CCFL or EEFL fluorescent tube) is the conventional art solution of Large-size LCD Screen light source.The directly-down liquid crystal backlight modular structure principle of the cathode fluorescent tube of prior art (referring to: CCFL or EEFL fluorescent tube) is as shown in Figure 1: cathode fluorescent tube 2 arrays of emission backlight 5 are installed in shell 1, and its top is provided with diffusion sheet 4; Its below is provided with reflecting plate 3.
The Large-size LCD Screen that prior art adopts above traditional backlight technology as: the brightness of 32/47/52/65 liquid crystal display such as inch such as grade is all between 400 to 800 cd/ ㎡; The strong occasion of ambient lighting as: outdoor billboard, above brightness are just not enough; General brightness on daytime could meet the demands more than will reaching 1200 cd/ ㎡ fully.Can't obtain under the situation of breakthrough raising in single CCFL/EEFL brightness now,, just must increase the density and the quantity of CCFL/EEFL fluorescent tube in the LCD backlight module in order to improve backlight illumination.Because the luminous efficiency of CCFL/EEFL fluorescent tube is below about 20 percent; The density and the quantity that increase fluorescent tube can cause that module heating backlight increases suddenly; Reduce liquid crystal display service life even high temperature and burn out liquid crystal display; (as: under the outdoor sunlight in summer of the Northern Hemisphere) uses in the high environment of temperature, and high brightness is a pair of insoluble contradiction with control module temperature backlight.
Summary of the invention
The purpose of this invention is to provide a kind of high brightness temperature self-adaptation straight-down negative cathode fluorescent tube (referring to: CCFL or EEFL fluorescent tube) LCD backlight module, LCD backlight module of the present invention can be dissolved and improve liquid crystal display brightness and control the contradiction between module temperature backlight; The module backlight that has taken place when having avoided using the way that increases backlight lamp tube to improve brightness generates heat to increasing suddenly and burns out liquid crystal display or reduce the liquid crystal display problem in service life; Also efficiently solve simultaneously the problem of under low temperature environment, using easy freezing liquid crystal display.Make liquid crystal display not only satisfy requirement that high brightness shows and just change under the big situation (as: open air or high latitude area) in environment temperature simultaneously and work reliably, expanded the use field of liquid crystal display.
Accomplishing above goal of the invention scheme is; A kind of high brightness temperature self-adaptation straight-down negative cathode fluorescent tube (referring to: CCFL or EEFL fluorescent tube) LCD backlight module; Cathode fluorescent tube (referring to: CCFL or EEFL fluorescent tube) array is installed in the enclosure; This fluorescent tube array top is provided with diffusion sheet, this fluorescent tube array below is provided with reflecting plate; It is characterized in that described reflecting plate is made up of the heat radiating type reflecting plate, be covered with on this heat radiating type reflecting plate and be used for recess and convexity reflective and the increase area of dissipation; Described shell below is provided with brightness, temperature ACTIVE CONTROL system, the module intelligent controller backlight that be provided with refrigeration (heat) semiconductor array in this brightness, the temperature ACTIVE CONTROL system, dispels the heat (cold) sheet, temperature sensor, radiator outward, is made up of CPU; The driver of described temperature sensor, refrigeration (heat) semiconductor array and the driver of said luminous lamp tube array are connected with this module intelligent controller backlight.
Described " recess that increases area of dissipation is with protruding " can be arranged on each fluorescent tube below, cross section is parabolical, ditch bar shaped recess, and the ridge projections between each ditch bar shaped recess strip recess.So that take into account reflecting effect and radiating effect.
In the prioritization scheme, described refrigeration semiconductor array is the semiconductor array that adopts the cooling and warming bidirectional movement, and outer fin is wherein also used the heat radiation/cold scattering piece of heat radiation, cold scattering bidirectional movement instead.
In other words; High brightness temperature self-adaptation straight-down negative cathode fluorescent tube of the present invention (referring to: CCFL or EEFL fluorescent tube) LCD backlight module; Be made up of diffusion sheet, cathode fluorescent tube (referring to: CCFL or EEFL fluorescent tube) array, reflecting plate, metal case etc., one of its characteristic is a kind of heat radiating type reflecting plate of new structure, and promptly reflecting plate is interior heat radiation (cold) sheet of band definite shape simultaneously; In other words; The present invention increases to be provided with interior heat radiation (cold) sheet, and should in heat radiation (cold) sheet and reflecting plate be integrated formation heat radiating type reflecting plate; In the light that reflection fluorescent tube array sends, play the effect of quick conduction heat (cold); Two of its characteristic is: the brightness temperature ACTIVE CONTROL system that has increased a kind of particular combination structure and connected mode at reflecting plate at the back replaces traditional metal case: this system comprises reflecting plate, refrigeration (heat) semiconductor array, dispel the heat (cold) sheet, temperature sensor, radiator, module intelligent controller backlight etc. outward.Come the brilliant ambient humidity, light and temperature that shields of automatic regulator solution according to the parameter request of setting, this parameter can be assigned also and can be set through interface is artificial by the computer communication interface (like RS232, USB etc.) that connects liquid crystal display.
Specific embodiments of the present invention is following: the heat radiating type reflecting plate with a kind of new structure replaces traditional reflecting plate, and the heat radiating type reflecting plate of new structure plays the effect of heat conduction (cold) sheet simultaneously, conduction heat fast (cold) in reflective.Heat radiating type reflecting plate inner surface (fluorescent tube one side) has the heat radiation reflective structure, and it is parabolical shape that structure is not limited to the side shown in the figure two, also comprises other shapes.Reflecting plate outer surface (semiconductor array one side) has better flatness and surface smoothness, to guarantee closely to contact with semiconductor array (can assist and add heat-conducting glue), improves heat conduction/cold efficiency; Metal material (as: aluminium, copper or other alloy) surface that reflecting plate can adopt good heat conductivity forms reflector layer with the raising reflecting rate through plating or chemical treatment or spraying technology.Cathode fluorescent tube (CCFL or EEFL) and reflecting plate inner surface distance as far as possible are little, and with the reflecting surface form fit to improve the heat conduction reflecting effect.According to the luminance index requirement of liquid crystal display, can calculate parameter, quantity and the distribution density of CCFL/EEFL fluorescent tube.For the liquid crystal display of high brightness, can adopt the thin fluorescent tube of high brightness of dense distribution.This heat radiating type reflecting plate and fluorescent tube combination can make brightness can reach more than the 1200 cd/ ㎡.
The present invention also replaces traditional metal case with the brightness temperature ACTIVE CONTROL system of a kind of particular combination structure and connected mode; This system comprises reflecting plate, refrigeration (heat) semiconductor array, outer heat radiation (cold) sheet, temperature sensor, radiator, module intelligent controller backlight etc.
The radiator group is not only limited to the forced air cooling radiator that uses blower fan, can select for use as required: other active or passive heat radiation devices such as topping up radiator, heat-pipe radiator.
Refrigeration semiconductor can produce the temperature difference more than 20 ℃ at cold junction and hot junction.The luminance index of liquid crystal display as requested calculates parameter, quantity and the distribution density of cathode fluorescent tube (CCFL or EEFL) fluorescent tube.Can extrapolate gross calorific power according to fluorescent tube total power consumption and luminous efficiency; According to calculating and testing and to select corresponding refrigeration semiconductor parameter, design arranging and the structure of inside/outside fin and suitable blower fan group of refrigeration semiconductor array.
The ability to work that module intelligent controller backlight is regulated refrigeration (heat) total amount and heat radiation (cold) device group according to the semiconductor quantity of working in the detected liquid crystal display temperature of the temperature sensor control semiconductor array and operating current is regulated the liquid crystal display temperature.
When ambient air temperature is lower than the liquid crystal display operating temperature; The sense of current that intelligent controller control electronic switch changes refrigeration semiconductor switches cold and hot end, the heating liquid crystal display.
In low temperature environment (as below-20 ℃), when liquid crystal display was not in display working condition, module intelligent controller backlight can be closed cathode fluorescent tube (CCFL or EEFL), heated through semiconductor and protected liquid crystal display not to be damaged by frost.
The present invention has dissolved prior art and has improved liquid crystal display brightness and control the contradiction between module temperature backlight; The module backlight that has taken place when having avoided using the way that increases backlight lamp tube to improve brightness generates heat to increasing suddenly and burns out liquid crystal display or reduce the liquid crystal display problem in service life; Also efficiently solve simultaneously the problem of using freezing liquid crystal display under the low ambient temperature.The requirement that makes liquid crystal display not only satisfy the high brightness demonstration just changes under the big situation in environment temperature simultaneously works reliably, has expanded the use field of liquid crystal display.
Description of drawings
Fig. 1 is the directly-down liquid crystal backlight modular structure sketch map of prior art cathode fluorescent tube (CCFL or EEFL);
Fig. 2 is a structural representation of the present invention.
The specific embodiment
Embodiment 1: 52 inches LCD backlight modules of high brightness temperature self-adaptation straight-down negative cathode fluorescent tube (CCFL); And reequip a general 52 inches liquid crystal displays with novel backlight module of the present invention; Improve liquid crystal display brightness greatly, the temperature of liquid crystal display whole (comprising module backlight) is controlled in the setting range.
With reference to Fig. 2: 52 inches general liquid crystal displays that present embodiment uses are: 52 inches liquid crystal display LTA520HB13 of Samsung; The LCD backlight module that dispatches from the factory original-pack: join 14 CCFL fluorescent tubes; Adopt the universal backlight modular structure, brightness is 450 cd/ ㎡, and operating temperature is 0～50 ℃.
Adopt 52 inches LCD backlight modules of high brightness temperature self-adaptation straight-down negative cathode fluorescent tube of the present invention (CCFL) to replace original-pack module backlight; The novel backlight modular structure is as shown in Figure 2; Adopt 40 with the less CCFL fluorescent tube of the original-pack brightness same diameter of Samsung; The highlyest can reach brightness 1200 cd/ ㎡, when environment temperature during at-20 ℃～+ 50 ℃, through the brightness temperature ACTIVE CONTROL system of module backlight; Can with the liquid crystal display temperature be controlled in the range of set temperature as: environment temperature is at-15 ℃, and the liquid crystal display temperature can be controlled in 20 ℃ ± 5 ℃; Environment temperature is at+50 ℃, and the liquid crystal display temperature can be controlled in 40 ℃ ± 5 ℃; Dissolved and improved liquid crystal display brightness and control the contradiction between module temperature backlight; Environment temperature is at-20 ℃～0 ℃, when liquid crystal display is in not show state, can control the liquid crystal display temperature by at 10 ℃ ± 5 ℃, in case liquid crystal display is damaged by frost.
Cathode fluorescent tube 2 arrays of emission backlight 5 are installed in shell 1, and the top is provided with diffusion sheet 4; The below is provided with heat radiating type reflecting plate 3-1; Be provided with active radiator (blower fan) 8, temperature sensor 11, refrigeration (heat) semiconductor array 9 in the temperature ACTIVE CONTROL system, insulating heat-conductive layer 10, outer fin 12, intelligent controller 13.
Claims (6)
1. high brightness temperature self-adaptation straight-down negative cathode fluorescent tube LCD backlight module; The cathode fluorescent tube array is installed in the enclosure; This luminous lamp tube array top is provided with diffusion sheet, this luminous lamp tube array below is provided with reflecting plate; It is characterized in that described reflecting plate is made up of the heat radiating type reflecting plate, be covered with on this heat radiating type reflecting plate and be used for recess and convexity reflective and the increase area of dissipation; Described shell below is provided with brightness, temperature ACTIVE CONTROL system, the module intelligent controller backlight that is provided with refrigeration semiconductor array, outer fin, temperature sensor, radiator in this brightness, the temperature ACTIVE CONTROL system, is made up of CPU; The driver of the driver of described temperature sensor, refrigeration semiconductor array and said luminous lamp tube array is connected with this module intelligent controller backlight.
2. high brightness temperature self-adaptation straight-down negative cathode fluorescent tube LCD backlight module according to claim 1; It is characterized in that; Described " reflective with the recess that increases area of dissipation with protruding " be arranged on each fluorescent tube below, cross section is parabolical, ditch bar shaped recess, and the ridge projections between each ditch bar shaped recess strip recess.
3. high brightness temperature self-adaptation straight-down negative cathode fluorescent tube LCD backlight module according to claim 1 is characterized in that increasing at reflecting plate has brightness temperature ACTIVE CONTROL system at the back; This brightness temperature ACTIVE CONTROL system includes reflecting plate, refrigerating/heating semiconductor array, outer heat radiation, cold scattering piece, temperature sensor, radiator, module intelligent controller backlight.
4. high brightness temperature self-adaptation straight-down negative cathode fluorescent tube LCD backlight module according to claim 3; It is characterized in that; Described refrigeration semiconductor array; Be the semiconductor array that adopts the refrigerating/heating bidirectional movement, outer fin wherein adopts the heat radiation/cold scattering piece of heat radiation, cold scattering bidirectional movement.
5. according to claim 1 or 2 or 3 or 4 described high brightness temperature self-adaptation straight-down negative cathode fluorescent tube LCD backlight modules, it is characterized in that described cathode fluorescent tube is to adopt CCFL fluorescent tube or EEFL fluorescent tube.
6. high brightness temperature self-adaptation straight-down negative cathode fluorescent tube LCD backlight module according to claim 5; It is characterized in that; Described brightness temperature ACTIVE CONTROL system comes the ambient humidity, light and temperature of the brilliant screen of automatic regulator solution according to the parameter request of setting; This parameter is assigned by the computer communication interface that connects liquid crystal display, or sets through interface is artificial.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100396584A CN102563470A (en) | 2012-02-21 | 2012-02-21 | High-brightness temperature-adaptive direct-type cold cathode fluorescent lamp liquid crystal backlight module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100396584A CN102563470A (en) | 2012-02-21 | 2012-02-21 | High-brightness temperature-adaptive direct-type cold cathode fluorescent lamp liquid crystal backlight module |
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| CN102563470A true CN102563470A (en) | 2012-07-11 |
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| CN2012100396584A Pending CN102563470A (en) | 2012-02-21 | 2012-02-21 | High-brightness temperature-adaptive direct-type cold cathode fluorescent lamp liquid crystal backlight module |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103162183A (en) * | 2013-02-21 | 2013-06-19 | 合肥京东方光电科技有限公司 | Luminescent device, backlight module and display device |
| CN104390198A (en) * | 2014-11-06 | 2015-03-04 | 无锡悟莘科技有限公司 | Heat dissipation control system applied to solar LED (Light-Emitting Diode) illuminating device |
| CN106019715A (en) * | 2016-07-29 | 2016-10-12 | 奥英光电（苏州）有限公司 | Backlight module and liquid crystal displayer |
| CN108933995A (en) * | 2018-06-29 | 2018-12-04 | 中车大连机车研究所有限公司 | A kind of locomotive display device collecting 4G transparent transmission and data recorder function |
| CN109723995A (en) * | 2017-10-31 | 2019-05-07 | 王龙 | A kind of headlight for medical use |
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| CN1641436A (en) * | 2004-01-05 | 2005-07-20 | 鸿富锦精密工业（深圳）有限公司 | Straight-down backlight module |
| CN101013228A (en) * | 2005-10-03 | 2007-08-08 | 株式会社日立制作所 | Display device |
| CN101349831A (en) * | 2007-07-19 | 2009-01-21 | 芈振伟 | Apparatus for improving directly-down liquid crystal backlight lighteness uniformity |
| CN201787427U (en) * | 2010-07-02 | 2011-04-06 | 刘胜 | LCD backlight module integrating function of display housing and intelligent control |
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Patent Citations (5)
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| CN1641436A (en) * | 2004-01-05 | 2005-07-20 | 鸿富锦精密工业（深圳）有限公司 | Straight-down backlight module |
| CN101013228A (en) * | 2005-10-03 | 2007-08-08 | 株式会社日立制作所 | Display device |
| CN101349831A (en) * | 2007-07-19 | 2009-01-21 | 芈振伟 | Apparatus for improving directly-down liquid crystal backlight lighteness uniformity |
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| CN201787427U (en) * | 2010-07-02 | 2011-04-06 | 刘胜 | LCD backlight module integrating function of display housing and intelligent control |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103162183A (en) * | 2013-02-21 | 2013-06-19 | 合肥京东方光电科技有限公司 | Luminescent device, backlight module and display device |
| CN104390198A (en) * | 2014-11-06 | 2015-03-04 | 无锡悟莘科技有限公司 | Heat dissipation control system applied to solar LED (Light-Emitting Diode) illuminating device |
| CN106019715A (en) * | 2016-07-29 | 2016-10-12 | 奥英光电（苏州）有限公司 | Backlight module and liquid crystal displayer |
| CN109723995A (en) * | 2017-10-31 | 2019-05-07 | 王龙 | A kind of headlight for medical use |
| CN108933995A (en) * | 2018-06-29 | 2018-12-04 | 中车大连机车研究所有限公司 | A kind of locomotive display device collecting 4G transparent transmission and data recorder function |
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Application publication date: 20120711 |