CN102537784A - Low-power extremely-high-brightness LED (light emitting diode) backlight source used for liquid crystal projection display system - Google Patents
Low-power extremely-high-brightness LED (light emitting diode) backlight source used for liquid crystal projection display system Download PDFInfo
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- CN102537784A CN102537784A CN201110416155XA CN201110416155A CN102537784A CN 102537784 A CN102537784 A CN 102537784A CN 201110416155X A CN201110416155X A CN 201110416155XA CN 201110416155 A CN201110416155 A CN 201110416155A CN 102537784 A CN102537784 A CN 102537784A
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Abstract
The invention provides a low-power extremely-high-brightness LED backlight source used for a liquid crystal projection display system. The low-power extremely-high-brightness LED backlight source comprises the following configuration methods: (1) a high-efficiency LED array and condensing-reflection bowl array arrangement manner is adopted; (b) the LED may be an LED light emitting unit consisting of one to three LEDs or LED chips with different colors of red, green and blue and at least having one green LED or LED chip; (c) a high-efficiency LED chip is adopted; (d) an aluminum-based, copper-based or thermally conductive ceramic substrate backlight circuit board is adopted; (e) the single LED chip has a rated power of 0.5 W or above, and the low-power operation manner can fully improve the LED luminous efficiency; and (f) an optical brightness enhancement membrane between a liquid crystal display screen and the LED light emitting unit is tightly attached to the liquid crystal display screen. The low-power extremely-high-brightness LED backlight source has the advantages of short design period, low manufacture cost of a key optical element (namely reflector), long service life, and high convenience in installation and maintenance, and can be used for manufacturing the backlight source of various kinds of liquid crystal projection heads-up display system.
Description
Technical field
What the present invention relates to is a kind of high brightness LED-backlit light source that is used for liquid crystal projection display systems.Belong to illumination light source and optical technical field.
Background technology
At present, it all is to show image source with the high luminance pixel pipe as high brightness that tradition is used for projection display system, and relevant light path is seen Fig. 1; The high luminance pixel pipe is a kind of cathode ray tube (CRT); Because color display systems such as the television set of CRT form, monitor are replaced by flat panel display systems such as showing PDP with liquid crystal, plasma; The CRT relevant industries progressively disappeared in today, so the high luminance pixel pipe also will progressively be replaced by the liquid crystal display image source of high brightness; The display frame that the Projection Display optical system will show image source is amplified the angle of visual field through optical projection system, and reflexes to observer's eyes through half-reflecting half mirror, at infinity becomes the virtual image.The luminous angle of visual field of demonstration of corresponding high luminance pixel pipe generally gets final product greater than ± 30 °.In order to see the environmental aspect outside the storehouse simultaneously clearly, the transmitance of half-reflecting half mirror is much larger than reflectivity, and general transmitance is 80%, and therefore reflectivity has the light near 80% to be seen through loss about 20%; Under the strong sunlight environment, for clearly the observation demonstration is visual, the demonstration image brightness of process half-reflection and half-transmission mirroring is greater than 6000 cd/m
2, the display brightness of corresponding high luminance pixel pipe will reach 30000 cd/m
2More than.The general relatively high brightness LCD of this luminance index is at 1000～1500 cd/m
2High brightness, high 20～30 times, so be called high brightness; For contrast and the resolution capability that improves Projection Display under high-brightness environment, high brightness CRT pixel pipe generally adopts green emitting phosphor, only sends green spectral, and is only at the coloured display capabilities of recent projection display system, also higher to the requirement of brightness.With liquid crystal display replace high brightness CRT pixel pipe before more than 10 years just the someone begin one's study, key technical problem is the liquid crystal display that specific (special) requirements is arranged of customization and has the backlight of high brightness.Projection display systems such as general liquid crystal or LCOS, DLP adopt Metal halogen lamp, high pressure xenon lamp as light source; These light source light-emitting efficiencies higher (reaching 100Lm/W); But its spectrum that sends comprises a large amount of thermal infrareds and other visible lights beyond the green, and high brightness special spectrum, low weight, the small size that reach projection display system require very big difficulty.
Development along with the LED technology; Luminous efficient progressively improves, and the luminous efficiency of White LED is greater than 100Lm/W, and the luminous efficiency of green LED has reached 90Lm/W; And the spectrum that LED sends seldom contains thermal infrared spectrum; As far as green LED, green spectral of sending and traditional high luminance pixel pipe spectrum are approaching, can be alternative fully; Therefore adopt single colour liquid crystal display (the high 2-3 of the relative chromatic liquid crystal screen of transmitance doubly), be core with the green LED; Under the situation of needs, can increase redness, blue led; Work asynchronously through the RGB colored backlight; The picture of the different colours that the another arena shows, the characteristic of utilizing human eye vision to stop forms COLOUR IMAGE VISUALIZATION OF HE.
Summary of the invention
What the present invention proposed is a kind of high brightness LED-backlit of low-power light source that is used for liquid crystal projection display systems; Its purpose is intended to overcome complicated, the defectives such as power is big, cost height of existing in prior technology configuration; Satisfy the projection display system requirement; Alternative traditional high luminance pixel pipe has characteristics such as power is low, brightness height.
Technical solution of the present invention: a kind of high brightness LED-backlit of low-power light source that is used for liquid crystal projection display systems, its collocation method comprises:
A, employing efficient LED led array and optically focused reverberation bowl array arrangement mode possess the low-angle characteristics of luminescence;
B, LED can be one to three different colours red, green, blues; At least the LED luminescence unit that viridescent LED or led chip are formed; Needs according to the display image color; Cooperate and the capable field synchronization led drive circuit of display image, the high brightness of sending different colours is backlight;
C, employing efficient LED led chip, according to the shape of the number of chips in each LED luminescence unit, the figure design reflectivity bowl of arranging, the luminous point of led chip or face overlap with the reflection paraboloid focal plane of reverberation bowl basically; The reflector shape of reverberation bowl has outside the angle of the deciding optically focused characteristic, and improves the uniformity of liquid crystal display image planes light luminance to greatest extent; The reverberation bowl array that a plurality of reverberation bowls are formed concentrates on the reflecting plate, and the reverberation bowl surface of reflecting plate and outer surface are made the polishing coating film treatment;
D, adopt aluminium base, copper base or thermal conductive ceramic base material backlight circuit plate, welding optical diode LED or bind led chip has more large-area heat dissipation metal housing to assemble with thermal Ceramics base material backlight circuit plate low thermal resistance and contacts heat radiation;
E, more than the specified 0.5W of LED single-chip, the mode of low-power operation fully improves the luminous efficiency of LED;
F, the optical brightening membrane between LCDs and LED luminescence unit are close to LCDs; On the uniformity of luminance basis that guarantees light source; Improve the display brightness of liquid crystal display systems, more than under smaller power density, satisfy certain luminance and uniformity requirement light source promptly be the high brightness LED-backlit of the low-power light source that is used for liquid crystal projection display systems of the present invention.
The present invention has the following advantages: the advantage that the design cycle is short, critical optical elements reflecting plate processing cost is low can be used for making various crystal projections and looks squarely the display system back light.Life-span is long, and installation and maintenance are convenient.
Description of drawings
Accompanying drawing 1 is the light path sketch map of projection display system.
Accompanying drawing 2 is LED brightness angle scatter charts of approximate lambertian distribution.
Accompanying drawing 3 is graphs of a relation of operating current relative brightness.
Accompanying drawing 4 is graphs of a relation of operating current and LED tube voltage drop.
Accompanying drawing 5 is graphs of a relation of the junction temperature and the luminous efficiency of led chip.
Accompanying drawing 6 is the basic light channel structure sketch mapes of the present invention.
Accompanying drawing 7 is to a corresponding reverberation bowl bottom opening figure to the number of chips design of three LEDs.
Accompanying drawing 8 is reverberation bowl parabolic profile shapes, and the LED light-emitting area overlaps with parabolic focus is approximate, and parabolical angular aperture is schemed with the angle of visual field consistent (as 60 °) that final products require.
Accompanying drawing 9 is to the different LED corresponding different reverberation bowl light-emitting window shaped design figure of array that arranges.
When wherein Fig. 9 a is the LED arranged, light-emitting window circular, fashion figure; When 9b is the LED arranged, light-emitting window circular, fashion figure; When 9c is LED triangle (honeycombed) arrangement, light-emitting window hexagon mode figure; When 9d is the LED rounded projections arranged, light-emitting window circular, fashion figure.
Accompanying drawing 10 is the height in the backlight chamber in the basic light channel structure, the thickness chart of reflecting plate.
In the accompanying drawing 1 is radiating shell, the 2nd, thermal conductive ceramic base material backlight circuit plate, the 3rd, LED luminescence unit, the 4th, reverberation bowl (reflecting plate), the 5th, lamp chamber, the 6th, optical brightening membrane, the 7th, single colour liquid crystal display.
The specific embodiment
Map 2, it is about about 70% that ° extraneous light ray energy (dash area) accounts for the ratio of total light flux in spherical angle ± 30, and calculate and can draw with formula (1),
ΦUnder the constant situation of luminous flux, if the LED light focusing that will be similar to lambertian distribution (being equivalent to θ is 120 °) (being equivalent to θ is 60 °) in ± 30 ° of scopes, this moment, the light intensity I at positive 0 degree angle can be increased to 3.73 times of original luminance in theory.Can increase brightness backlight greatly so increase reverberation bowl; Will reach same backlight illumination in other words, power can drop to original below 30%;
In the formula (1), Φ is luminous flux (Lm of unit), and I is the light intensity (cd of unit) at 0 degree angle.θ is 1/2 jiao of 2 θ, promptly usually said LED half-value angle.
Contrast accompanying drawing 6; Basic light channel structure comprises radiating shell 1, thermal conductive ceramic base material backlight circuit plate 2, LED luminescence unit 3, reverberation bowl or reflecting plate 4, lamp chamber 5, optical brightening membrane 6, single colour liquid crystal display 7; Wherein thermal conductive ceramic base material backlight circuit plate 2 is installed on the radiating shell 1; LED luminescence unit 3, reverberation bowl or reflecting plate 4 are installed on thermal conductive ceramic base material backlight circuit plate 2 at interval; 7 of reverberation bowl or reflecting plate 4 and single colour liquid crystal displays are lamp chambeies 5, and optical brightening membrane 6 is close on the single colour liquid crystal display 7.
Described LED luminescence unit 3 has at least the LED of a green or led chip to form by one to three different colours red, green, blue, and green pipe is at 90Lm/W, and red pipe is at 55Lm/W, and blue pipe is more than 25Lm/W;
Collocation method of the present invention comprises:
A, employing efficient LED led array and optically focused reverberation bowl array arrangement mode possess the low-angle characteristics of luminescence;
B, LED can be one to three different colours red, green, blues; At least the LED luminescence unit 3 that viridescent LED or led chip are formed; Needs according to the display image color; Cooperate and the capable field synchronization led drive circuit of display image, the high brightness of sending different colours is backlight;
C, employing efficient LED led chip, according to the shape of the number of chips in each LED luminescence unit 3, the figure design reflectivity bowl of arranging, the luminous point of led chip or face overlap with the reflection paraboloid focal plane of reverberation bowl 4 basically; The reflector shape of reverberation bowl has outside the angle of the deciding optically focused characteristic, and improves the uniformity of liquid crystal display image planes light luminance to greatest extent; The reverberation bowl array that a plurality of reverberation bowls are formed concentrates on the reflecting plate, and the reverberation bowl surface of reflecting plate and outer surface are made the polishing coating film treatment;
D, adopt aluminium base, copper base or thermal conductive ceramic base material backlight circuit plate 2, welding optical diode LED or bind led chip has more large-area heat dissipation metal housing 1 to assemble with thermal Ceramics base material backlight circuit plate 2 low thermal resistances and contacts heat radiation;
E, more than the specified 0.5W of LED single-chip, the mode of low-power operation fully improves the luminous efficiency of LED;
F, the optical brightening membrane between LCDs 7 and LED luminescence unit 3 are close to LCDs; On the uniformity of luminance basis that guarantees light source; Improve the display brightness of liquid crystal display systems, more than under smaller power density, satisfy certain luminance and uniformity requirement light source promptly be the high brightness LED-backlit of the low-power light source that is used for liquid crystal projection display systems of the present invention.
Several are installed by the led light source that color LED luminescence unit 3 is formed on the thermal conductive ceramic base material backlight circuit plate 2, that is close to that the backlight circuit plate installs corresponding array forms the reflecting plate of array by a plurality of reverberation bowls; The height H of the lamp control 5 between reflecting plate and the LCDs 7 should guarantee that colour mixture is abundant, display brightness is even, and the quantity of LED luminescence unit 3 arrays is by single group luminosity decision of LCDs 7 sizes, liquid crystal display light penetration and brightness requirement, each LED luminescence unit 3.
The reflecting plate of corresponding reverberation bowl array is installed on LED luminescence unit 3 arrays; The LED arrangement mode can be that arranged, isosceles triangle are arranged, corresponding reverberation bowl light-emitting window be shaped as circle, rectangle or regular hexagon.
Lamp chamber height H and LED quantity designing and calculating; For the colour mixture that improves, guarantee bright dipping backlight fully, brightness and uniformity; Between reflecting plate and the single colour liquid crystal display 7 apart from lamp chamber height H and LED arrange spacing L1, L2 coordinate design; Lamp chamber height H is arrange spacing L1 or L2 of 2-3 LED doubly, and LED spacing L1, the LED spacing L2 that arranges that arranges generally equates here, LED arrange spacing L1, LED the arrange area and the LED quantity correlation computations of spacing L2 and single colour liquid crystal display 7; Promptly in the liquid crystal display indication range of correspondence by certain rule rate X LED unit of arranging, LED spacing L1, the LED spacing L2 that arranges that arranges confirms naturally; The quantity of LED luminescence unit 3 arrays is by single group luminosity decision of the single colour liquid crystal display that requires 7 sizes, LCDs light penetration and brightness requirement, each LED luminescence unit 3, and computational methods are following:
If the quantity of LED luminescence unit 3 arrays is X;
Like Φ=15Lm when 50mA (the green tube current of certain LED), θ=60 °, I=17.8 cd
The LCDs light penetration is δ (a general single colour liquid crystal display 10%～20%), and area is A, and going out to shield brightness is that (the present invention requires B>=30000 cd/m to B
2);
Blooming efficient is ρ, and as adopting low haze polarisation brightness enhancement film, ρ is about 0.75;
Reverberation bowl surface reflectivity k, lamp chamber light utilization ratio f;
X=B×A÷（I×δ×ρ×k×f） （1）
It can be that matrix or square arrangement, isosceles triangle are arranged that LED arranges, and the shape of corresponding reverberation bowl light-emitting window is corresponding circle, rectangle or regular hexagon.To different led chip spread geometries (as shown in Figure 7), the shape of reflecting surface is to be parabolic form is smoothly transitted into light-emitting window from reverberation bowl bottom opening figure shape (like Fig. 9).Wherein reflecting surface all is that circular situation is the simplest to the shape of bottom shape and light-emitting window, and design, processing cost are all much lower; But light-emitting window is rectangle or hexagonal reverberation bowl light-emitting uniformity to be relatively good.
The thermal design of LED improves the LED working life to the luminous efficiency that improves LED with assurance; Extremely important; Select aluminium base, the copper base circuit board (price of ceramic substrate is very high, improper use) of low thermal resistance here, the heat conduction adhesives of low thermal resistance; The heat with led chip of low thermal resistance passes to circuit board (if bind, just directly passing on the circuit board through adhesives) through shell; The heat of circuit board is transmitted to outside radiator structure through adhesives, can being transmitted on other radiator structures of outside radiator structure, or loose heat in air through air-cooled method; Must fully dispel the heat to back light system in a word, guarantee that the junction temperature rise of LED is lower than 20～30 ℃, promptly environment temperature is in the time of 35 ℃, and junction temperature is lower than 65 ℃, and this moment, the working life of LED can reach 5～100,000 hours, and luminous efficiency is declined by less than 5%.
Penetrate design, the processing of plate; Like Fig. 8; The reverberation bowl degree of depth h of reflecting plate, relevant with arrange shared size and reverberation bowl diameter of half-value angle backlight, led chip, the diameter of reverberation bowl and led array spacing L1, the led array spacing L2 dimension D of arranging of arranging is approaching; Like led array arrange spacing L1, led array arrange spacing L2=5.3, then D=5.0; To different led chip spread geometries (as shown in Figure 7), the shape of reverberation bowl is to be parabolic form is smoothly transitted into light-emitting window from reverberation bowl bottom opening figure shape (like Fig. 9); Reflecting plate can adopt metal material, and accurate automation equipment processes; The surface treatment of the reverberation bowl surface of reflecting plate and outer surface polishing plated film or other modes reaches reflectivity 90% above level; When displaying contents needs when colored, can green LED be core, increase red, blue led, through the RGB colored backlight with show signal Synchronization work, the picture of the different colours that the another arena shows, the characteristic of utilizing human eye vision to stop forms COLOUR IMAGE VISUALIZATION OF HE.To the selected LED design and the drive circuit of the capable field synchronization of liquid crystal display image, and control its brightness ratio, realize that physical circuit the present invention such as wide region lightens will not detail.
The present invention does not detail part and can confirm with reference to relevant design handbook and standard.
Claims (5)
1. the high brightness LED-backlit of low-power light source that is used for liquid crystal projection display systems is characterized in that comprising following collocation method:
A, employing efficient LED led array and optically focused reverberation bowl array arrangement mode possess the low-angle characteristics of luminescence;
B, LED are one to three different colours red, green, blues; At least the LED luminescence unit that viridescent LED or led chip are formed; Needs according to the display image color; Cooperate and the capable field synchronization led drive circuit of display image, the high brightness of sending different colours is backlight;
C, employing efficient LED led chip, according to the shape of the number of chips in each LED luminescence unit, the figure design reflectivity bowl of arranging, the luminous point of led chip or face overlap with the reflection paraboloid focal plane of reflection basically; The reflector shape of reverberation bowl has outside the angle of the deciding optically focused characteristic, and improves the uniformity of liquid crystal display image planes light luminance to greatest extent; The reverberation bowl array that a plurality of reverberation bowls are formed concentrates on the reflecting plate, and the reverberation bowl surface of reflecting plate and outer surface are made the polishing coating film treatment;
D, adopt aluminium base, copper base or thermal conductive ceramic base material backlight circuit plate 2, welding optical diode LED or bind led chip has more large-area heat dissipation metal housing 1 to assemble with thermal Ceramics base material backlight circuit plate 2 low thermal resistances and contacts heat radiation;
E, more than the specified 0.5W of LED single-chip, the mode of low-power operation fully improves the luminous efficiency of LED;
F, the optical brightening membrane between LCDs and LED luminescence unit are close to LCDs; On the uniformity of luminance basis that guarantees light source; Improve the display brightness of liquid crystal display systems, more than under smaller power density, satisfy certain luminance and uniformity requirement light source promptly be the high brightness LED-backlit of the low-power light source that is used for liquid crystal projection display systems of the present invention.
2. a kind of high brightness LED-backlit of low-power light source that is used for liquid crystal projection display systems according to claim 1; It is characterized in that several being installed by the led light source that the color LED luminescence unit is formed on the thermal conductive ceramic base material backlight circuit plate, that is close to that the backlight circuit plate installs corresponding array forms the reflecting plate of array by a plurality of reverberation bowls; The height (H) of the lamp control between reflecting plate and the LCDs should guarantee that colour mixture is abundant, display brightness is even, and the quantity of LED array of light emitting cells is by single group luminosity decision of LCDs size, liquid crystal display light penetration and brightness requirement and each LED luminescence unit.
3. the high brightness LED-backlit of the low-power of liquid crystal projection display systems according to claim 2 light source is characterized in that on the LED array of light emitting cells, being equipped with the reflecting plate of corresponding reverberation bowl array; The LED arrangement mode can be that arranged, isosceles triangle are arranged, corresponding reverberation bowl light-emitting window be shaped as circle, rectangle or regular hexagon.
4. the high brightness LED-backlit of the low-power of liquid crystal projection display systems according to claim 2 light source; It is characterized in that the LED luminescence unit has LED or the led chip more than the different colours of one separation; The shared external reverberation bowl optically focused of the LED of each unit or led chip; Can send the light that angular range distributes, and, cooperate and the capable field synchronization led drive circuit of display image according to the needs of display image color; The high brightness of sending different colours is backlight, can show the image of green, redness, blueness and blend color thereof.
5. the high brightness LED-backlit of the low-power of liquid crystal projection display systems according to claim 2 light source; It is characterized in that thermal conductive ceramic base material backlight circuit plate is installed on the radiating shell; LED luminescence unit, reverberation bowl or reflecting plate are installed on thermal conductive ceramic base material backlight circuit plate at interval; Between reverberation bowl or reflecting plate 4 and single colour liquid crystal display is the lamp chamber, and optical brightening membrane is close on the single colour liquid crystal display.
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| CN103277760A (en) * | 2013-06-06 | 2013-09-04 | 东莞博用电子科技有限公司 | LED distributing method applied in LED sectional driving circuit |
| CN103470992A (en) * | 2013-09-27 | 2013-12-25 | 中国科学院半导体研究所 | Projection illuminating system |
| CN106200121A (en) * | 2016-08-29 | 2016-12-07 | 合肥惠科金扬科技有限公司 | A kind of LCD screen backlight barrier structure |
| CN106292064A (en) * | 2016-08-29 | 2017-01-04 | 合肥惠科金扬科技有限公司 | A kind of LCD screen backlight occlusion method |
| CN107045255A (en) * | 2017-02-03 | 2017-08-15 | 中国电子科技集团公司第五十五研究所 | A kind of slim LC projection display LED polarization light sources |
| CN107781779A (en) * | 2017-05-09 | 2018-03-09 | 广州漫美帝灯光设备有限公司 | A kind of LED toning lamps |
| CN108388014A (en) * | 2018-05-15 | 2018-08-10 | 萤欧（上海）汽车科技有限公司 | A kind of brightness automatic adjusument AR HUD lamp optical systems |
| CN108490610A (en) * | 2018-03-22 | 2018-09-04 | 京东方科技集团股份有限公司 | Improve the method and back lighting device of HUD brightness homogeneities |
| CN111487801A (en) * | 2020-05-28 | 2020-08-04 | 中航华东光电有限公司 | Airborne liquid crystal display module with spectrum reduction capability and mapping head-up display |
| CN113465301A (en) * | 2021-07-09 | 2021-10-01 | 张小芸 | Vacuum drying kettle for fine chemical production |
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| CN107045255A (en) * | 2017-02-03 | 2017-08-15 | 中国电子科技集团公司第五十五研究所 | A kind of slim LC projection display LED polarization light sources |
| CN107781779A (en) * | 2017-05-09 | 2018-03-09 | 广州漫美帝灯光设备有限公司 | A kind of LED toning lamps |
| CN108490610A (en) * | 2018-03-22 | 2018-09-04 | 京东方科技集团股份有限公司 | Improve the method and back lighting device of HUD brightness homogeneities |
| CN108388014A (en) * | 2018-05-15 | 2018-08-10 | 萤欧（上海）汽车科技有限公司 | A kind of brightness automatic adjusument AR HUD lamp optical systems |
| CN111487801A (en) * | 2020-05-28 | 2020-08-04 | 中航华东光电有限公司 | Airborne liquid crystal display module with spectrum reduction capability and mapping head-up display |
| CN113465301A (en) * | 2021-07-09 | 2021-10-01 | 张小芸 | Vacuum drying kettle for fine chemical production |
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Application publication date: 20120704 |