CN202165911U - LED backlight for liquid crystal display with high color saturation - Google Patents
LED backlight for liquid crystal display with high color saturation Download PDFInfo
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- CN202165911U CN202165911U CN2011200030812U CN201120003081U CN202165911U CN 202165911 U CN202165911 U CN 202165911U CN 2011200030812 U CN2011200030812 U CN 2011200030812U CN 201120003081 U CN201120003081 U CN 201120003081U CN 202165911 U CN202165911 U CN 202165911U
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Abstract
An LED backlight for a liquid crystal display with high color sanitation relates to a backlight of a liquid crystal display. The prior-art LED backlight has inferior color saturation. The LED backlight is characterized in that: the LED chip comprises at least five kinds of chips, which emit the light with different wavelengths; the wavelengths of the light that is emitted from the chips is 450-680nm; the chips which transmit the light with same wavelength are connected for forming a chipset; a driving device comprises the following components: a microprocessor, a plurality of constant-current driving circuits which are connected with the microprocessor and corresponds with the number of the chipsets, and a power supply which supplies power to the microprocessor and the driving circuit; and each chipset is individually powered by a corresponding PWM driving circuit for individually controlling the current of each chipset. The LED backlight which is generated according to the technical solution of the utility model is adopted for forming a while light source with similar daylight spectrum distribution is formed in a vision-sensitive area of the human eye, thereby realizing a purpose of improving color saturation of the liquid crystal display screen.
Description
Technical field
The utility model relates to a kind of Backlight For Liquid Crystal Display Panels.
Background technology
LCDs be current in, the main flow of small size display screen; But liquid crystal is a kind of passive type display screen; It self can be not luminous; Need to rely on the illumination ability display text and the image in the external world, the source of ambient light photograph mainly is to rely on screen CCFL fluorescent tube all around to introduce light from the side now, and the even optical mechanism of process has an even brightness illumination by liquid crystal display again.
The progress of LED makes many liquid crystal displays factory household LED substitute CCFL in recent years; The form of irradiation has copies the CCFL fluorescent tube to advance light from the side; Irradiation source outside the conduct of LED luminous plaque is loaded onto at the back side of liquid crystal display is also arranged; Be referred to as the LED-backlit source in the industry, the LED no matter which kind of form of irradiation is used is following two kinds basically.
A: general white light LEDs
This white light LEDs is that the led chip by blue light-emitting adds what yellow fluorescent powder constituted, and the composition of ruddiness is few in its spectrum, so after making LCDs, its color saturation is merely 72～75%, color is not ideal enough.
The white light LEDs of B:RGB
Three kinds of colors of red, green, blue in the ratio of 3:6:1 mixed after, also can form white light, make the backlight of liquid crystal display with this LED after; The ability of display color just becomes stronger; Can reach about 85%, but because the LED luminescence chip is a semiconductor devices, what it sent is monochromatic light; Shared spectrum is very narrow, so the color that shows still can not be satisfactory.
The utility model content
The technical problem that the utility model will solve and the technical assignment of proposition are that the prior art scheme is improved and improved; The LED-backlit source that provides a kind of LCD to use with high color saturation; Can in the vision sensitizing range of human eye, form the white light source that type spectrum of sunlight distributes to reach, improve the purpose of LCDs color saturation.For this reason, the utility model is taked following technical scheme.
The LED-backlit source that a kind of LCD with high color saturation is used; Comprise base, be located at led chip on the base, be used to carry the backlight of base and heat radiation, the drive unit that is electrically connected with led chip; It is characterized in that: described led chip comprises the chip of 5 kinds of different emission wavelengths at least; The chip light emitting wavelength is contained 450～680nm, and the chip of identical emission wavelength connects into chipset; Described drive unit comprises microprocessor, with connect a plurality of of microprocessor and constant-current drive circuit that chipset quantity is corresponding, be used for power supply to microprocessor and drive circuitry; Each chipset is supplied power with each chipset electric current of independent control separately by the PWM drive circuit of correspondence.Brightness and the driving power decision as required of the quantity of one group of chips; The spectral wavelength section of human eye ability perception is 380～780nm; Yet in fact, below 450nm, the light of the above wavelength of 680nm; The luminous sensitivity of human eye is very low, can contain 450～680 nm and just can satisfy the sensation of human eye to color well if light source sends light wavelength.The led chip that various differences are photochromic, its spectrum have the width of 20～30nm at 1/2 power place, the width of 40～60nm is arranged at 1/4 place, that is to say that independent a kind of chip is the spectrum of a spike shape.Luminous by the chip portfolio of using 5 kinds of different emission wavelengths at least in 450～680 nm wavelength period, the continuous luminescent spectrum of formation type daylight is made the color saturation that backlight can improve liquid crystal display with this LED; Each chipset is by independent constant-current drive circuit power supply, and the electric current of regulating every kind of chip can change the light intensity of its output, thereby changes the correlated colour temperature of sending light, is convenient to regulate contrast, brightness and color saturation.The jump that drive circuit is regulated electric current is 1/256 or 1/16 of a maximum current, is convenient to regulate contrast, brightness and color saturation.
As the further of technique scheme improved and replenish, the utility model also comprises following additional technical feature.
Microprocessor is used for the control device of control chip group supply current through wired or wireless communication modes connection one; Said wireless communication mode is infrared-ray communication, radio-frequency communication or ultrasonic communication.Control signal can be delivered to microprocessor through wired or wireless mode, and microprocessor takes orders and afterwards recently changes the output current of PWM drive circuit through the adjusting duty,
Led chip is made up of the chip of 6 kinds of emission wavelengths, and the peak luminous wavelength of adjacent chips group is at interval at 20～55nm, and the surface of chip is covered with the diffuse reflector that is used for mixed light.The led chip wavelength can be respectively: 455nm, 475 nm, 525nm, 580nm, 625nm, 640nm, and the peak luminous wavelength of adjacent chips group is at interval at 20～55nm, and the surface of chip is covered with the diffuse reflector that is used for mixed light.LED forming of six kinds of chips thus send the white light of the class daylight with continuous spectrum.
Led chip is made up of the chip of 5 kinds of different emission wavelengths, is covered with the diffuse reflector that is used for mixed light on the surface of chip, and described diffuse reflector is the light-converting material layer.Substitute chipset by light-converting material, when guaranteeing to form the continuous luminescent spectrum of type daylight, reduced corresponding drive circuit, reduce cost.
The chip wavelength of 5 kinds of different emission wavelengths is respectively 455nm, 475 nm, 525nm, 626nm, 640nm, and described diffuse reflector is the light-converting material layer that contains yellow fluorescent powder.580nm chip issued light between 525nm and 626 nm is yellow; The light efficiency of this LED is not high; Fluorescent material with the yellow that covers replaces 580 nm chips, and when reducing chip kind and corresponding drive circuit, fluorescent material also plays the effect of mixed light.
The top of led chip is provided with the lens of the light distribution that is used to change emergent light.
Rare in the middle of the arrangements of chips on the base, outer careful.This structure makes the spatial distribution of emergent light even.
Backlight for the arc cylinder make position base on it change towards.Make the spatial distribution of emergent light even.
Each base is provided with the led light source of multi-wavelength's led chip formation, and diffuse reflector is established in the top of led light source, and led light source is closely arranged the formation light sources.
The fine strip shape that backlight is the rectangle that can match with liquid crystal display or can matches with the liquid crystal display sidewall is established even tabula rasa on the light sources, the fine strip shape backlight is provided with the LGP that is used for light is introduced the liquid crystal display back side.
Beneficial effect: luminous by the chip portfolio of at least 5 kinds of different emission wavelengths in 450～680 nm wavelength period, the continuous spectrum of formation type daylight has improved color saturation; Each chipset has confirmed that it can keep constant by independent constant-current drive circuit power supply in case electric current is regulated.The electric current of regulating every kind of chip can change the light intensity of its output, thereby changes the correlated colour temperature of sending light, is convenient to regulate contrast, brightness and color saturation.
Description of drawings
Fig. 1 is a drive unit theory structure sketch map.
Fig. 2 is the spectral power distribution figure after five kinds of spectrum of the utility model synthesize.
Fig. 3 is the spectral power distribution figure after six kinds of spectrum of the utility model synthesize.
Fig. 4 is the utility model assembly structure sketch map.
Fig. 5 is a kind of structural representation that is used to change light distribution of the utility model.
Fig. 6 is second kind of structural representation that is used to change light distribution of the utility model.
Fig. 7 is a kind of led light source arrangement architecture of the utility model sketch map.
The specific embodiment
Below in conjunction with Figure of description the technical scheme of the utility model is done further detailed description.
As shown in Figure 1; The utility model comprises base 2, be located at led chip 1 on the base 2, be used to carry base 2 and the backlight 3 of heat radiation, the drive unit that is electrically connected with led chip 1; Wherein led chip 1 comprises the chip 1 of 5 kinds of different emission wavelengths at least; Chip 1 emission wavelength is contained 450～680nm, and the chip 1 of identical emission wavelength connects into chipset; Described drive unit comprises microprocessor, with connect a plurality of of microprocessor and constant-current drive circuit that chipset quantity is corresponding, be used for power supply to microprocessor and drive circuitry; Each chipset is supplied power with each chipset electric current of independent control separately by the PWM drive circuit of correspondence.Microprocessor is used for the control device of control chip group supply current through wired or wireless communication modes connection one; Said wireless communication mode is infrared-ray communication, radio-frequency communication or ultrasonic communication.Like Fig. 4,5, shown in 6, each base 2 is provided with the led light source 5 of multi-wavelength's led chip formation, for strengthening mixed light, can above led light source 5, establish diffuse reflector.Led light source 5 is closely arranged and is formed light sources 6.
The colour rendering of light source is to weigh the physical quantity of light source to illuminated object color reducing degree, and sunshine is the best light source of colour rendering, and it has continuous spectrum in the scope of whole visible wavelength, can obtain high color saturation.As far as artificial light sources, can think that the colour rendering of specified standard lamp is best in the world; What they sent also is continuous spectrum, and different-colour is the spectral power distribution difference.Make the spectral power distribution that the backlight of high color saturation will be copied standard lamp; Sending one is continuous spectral power distribution and the approaching light of standard lamp basically; But the spectrum range that standard lamp covers is very wide, has comprised the whole zone of 38 0nm～780nm in the visible region.LED to satisfy this spectral region very difficulty also there is no need because human eye to the sensitizing range of spectrum at 450nm～680nm wave band.According to the luminous wave band of this condition and led chip 1, choose the foundation of 45 5nm～680 nm wave bands as preparation liquid crystal screen back light source spectrum.
The led chip 1 that various differences are photochromic; Its spectrum has the width of 20～30nm at 1/2 power place, the width of 40～60nm is arranged at 1/4 place, that is to say that independent a kind of chip 1 is the spectrum of a spike shape; By the wavelength interval is that 35nm arranges, and then can constitute the zigzag continuous spectrum.
In specific embodiment, consider the factory of chip; Chip 1 wavelength of producing in batches is to customize, and the peak value of alternative chip 1 is respectively: 455nm, 475 nm, 502 nm, 535nm, 560nm, 580 nm, 625nm, 640nm, remove between 580 nm and the 625nm and differ 45 nm; Other all is less than 30 nm; Basically can overlap at 1/2～1/4 place of energy, the spectral power distribution figure that so forms is a zigzag continuous spectrum curve, because chip 1 supply of 502 nm, 535nm, three kinds of specifications of 560nm is little; And when chip a kind how after; Corresponding with it constant-current drive circuit is just many, in implementation process, can 502 nm and 535nm chip 1 usefulness 525 nm chips 1 be replaced for this reason, and cancellation 560nm chip 1; The formation emission wavelength is 6 groups of chipsets of 455nm, 475 nm, 525nm, 580nm, 625nm, 640nm; The peak luminous wavelength of adjacent chips group is at interval at 20～55nm, for the spectral power distribution that even light can be covered with 7, the 6 groups of chipsets of diffuse reflector that are used for mixed light on the surface of chip 1 as shown in Figure 3.1 of 580 nm chip are luminous to be yellow; Its light efficiency is not high; Employing substitutes 580nm chip 1 through the mode that on chip 1, covers yellow fluorescent powder, and the formation emission wavelength is 5 kinds of chipsets+contain the LED-backlit source of diffuse reflector 7 formations of yellow fluorescent powder of 455nm, 475 nm, 525nm, 625nm, 640nm, and its spectral power distribution is as shown in Figure 2; Form the continuous spectrum curve, satisfy the requirement of type daylight.
Because the integral thickness of LCDs is relatively thinner; Generally at 10～30mm, the distance of even light must be very short for this reason, yet if do not add other optical system; The white light of outgoing is Lang Baixing in the light distribution in space after the colour mixture; Main light intensity concentrates on ± 30 ° of angles in, this is unfavorable to even auroral poles, the spatial light intensity that adopts following three kinds of modes to change the LED emergent light in the present invention distributes.
1, above led chip 1, be provided with lens 4 to change the light distribution of emergent light, as shown in Figure 5, lens 4 can change to largest light intensity from the center ± and 50 ° more than the angle, so just can in millimetre-sized distance, form the even brightness hot spot.
2, usually the base 2 of LED is circle or rectangle, and led chip 1 evenly distributes on it, and the light intensity that it sent is Lang Baixing in spatial distribution; Be to form the even brightness hot spot, the present technique scheme changes the shape of LED base 2, changes the base 2 of LED into peanut shape; Rare in the middle of the even chip of all arranging 1 changes into, periphery solid matter row form a uniform hot spot of illumination thus, and are as shown in Figure 6; But effect is more weaker than setting up lens 4; Because no lens 4 have reduced assembly relation, cost is low slightly.
3, the general backlight 3 that matches with the liquid crystal display bottom surface is a rectangular flat, and light distribution is irregular; In the present technique scheme, change the shape of backlight 3, change backlight 3 into the arc cylinder led light source 5 that is overlying on the backlight 3 is changed towards to improve light distribution.
As the LED-backlit source that LCD is used, following two kinds of forms can be arranged on its structure.
1, as shown in Figure 7, a kind of is the planar light source 5 that makes rectangle, and aforesaid led light source group 6 is arranged on the rectangular backlight plate 3, and through an even tabula rasa, the light that sends each light sources 6 becomes even on whole liquid crystal face.
2, another kind is the elongated strip shaped that is designed to the LED-backlit source can be installed in the liquid crystal display side, which is provided with a plurality of compact arranged led light source groups 6, guides to the liquid crystal display back side to light through LGP.
Claims (10)
1. LED-backlit source that the LCD with high color saturation is used; Comprise base (2), be located at led chip (1) on the base (2), be used to carry base (2) and the backlight (3) of heat radiation, the drive unit that is electrically connected with led chip (1); It is characterized in that: described led chip (1) comprises the chip (1) of 5 kinds of different emission wavelengths at least; Chip (1) emission wavelength is contained 450～680nm, and the chip of identical emission wavelength (1) connects into chipset; Described drive unit comprises microprocessor, with connect a plurality of of microprocessor and constant-current drive circuit that chipset quantity is corresponding, be used for power supply to microprocessor and drive circuitry; Each chipset is supplied power with each chipset electric current of independent control separately by the PWM drive circuit of correspondence.
2. the LED-backlit source that a kind of LCD with high color saturation according to claim 1 is used is characterized in that: microprocessor is used for the control device of control chip group supply current through wired or wireless communication modes connection one; Said wireless communication mode is infrared-ray communication, radio-frequency communication or ultrasonic communication.
3. the LED-backlit source that a kind of LCD with high color saturation according to claim 1 is used; It is characterized in that: led chip (1) is made up of the chip of 6 kinds of emission wavelengths; The peak luminous wavelength of adjacent chips group is at interval at 20～55nm, and the surface of chip (1) is covered with the diffuse reflector (7) that is used for mixed light.
4. the LED-backlit source that a kind of LCD with high color saturation according to claim 1 is used; It is characterized in that: led chip (1) is made up of the chip of 5 kinds of different emission wavelengths; Cover the diffuse reflector (7) that is used for mixed light on the surface of chip (1), described diffuse reflector (7) is the light-converting material layer.
5. the LED-backlit source that a kind of LCD with high color saturation according to claim 4 is used; It is characterized in that: the chip of 5 kinds of different emission wavelengths (1) wavelength is respectively 455nm, 475 nm, 525nm, 626nm, 640nm, and described diffuse reflector (7) is for being used to increase the light-converting material layer of gold-tinted and mixed light.
6. the LED-backlit source of using according to the described a kind of LCD with high color saturation of the arbitrary claim of claim 1～5 is characterized in that: the top of led chip (1) is provided with the lens (4) of the light distribution that is used to change emergent light.
7. the LED-backlit source of using according to the described a kind of LCD with high color saturation of the arbitrary claim of claim 1～5 is characterized in that: the chip (1) on the base (2) is rare in the middle of arranging, and is outer careful.
8. the LED-backlit source of using according to the described a kind of LCD with high color saturation of the arbitrary claim of claim 1～5 is characterized in that: backlight (3) for the arc cylinder make position base (2) on it change towards.
9. the LED-backlit source that a kind of LCD with high color saturation according to claim 1 is used; It is characterized in that: each base (2) is provided with the led light source (5) of multi-wavelength's led chip formation, and diffuse reflector is established in the top of led light source (5); Led light source (5) is closely arranged and is formed light sources (6).
10. the LED-backlit source that a kind of LCD with high color saturation according to claim 9 is used; It is characterized in that: the fine strip shape that backlight (3) is the rectangle that can match with liquid crystal display or can matches with the liquid crystal display sidewall; Light sources is established even tabula rasa on (6), and fine strip shape backlight (3) is provided with the LGP that is used for light is introduced the liquid crystal display back side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200030812U CN202165911U (en) | 2011-01-06 | 2011-01-06 | LED backlight for liquid crystal display with high color saturation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200030812U CN202165911U (en) | 2011-01-06 | 2011-01-06 | LED backlight for liquid crystal display with high color saturation |
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| CN202165911U true CN202165911U (en) | 2012-03-14 |
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| CN2011200030812U Expired - Fee Related CN202165911U (en) | 2011-01-06 | 2011-01-06 | LED backlight for liquid crystal display with high color saturation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198799A (en) * | 2013-03-20 | 2013-07-10 | 深圳市华星光电技术有限公司 | Backlight driver board and liquid crystal display |
| CN109445189A (en) * | 2018-12-28 | 2019-03-08 | 深圳市英唐光显技术有限公司 | Light mixing structure for improving color gamut and visual acuity of display device |
| CN113409738A (en) * | 2021-05-25 | 2021-09-17 | 青岛海信医疗设备股份有限公司 | Backlight source circuit, control method thereof and display device |
-
2011
- 2011-01-06 CN CN2011200030812U patent/CN202165911U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103198799A (en) * | 2013-03-20 | 2013-07-10 | 深圳市华星光电技术有限公司 | Backlight driver board and liquid crystal display |
| WO2014146308A1 (en) * | 2013-03-20 | 2014-09-25 | 深圳市华星光电技术有限公司 | Backlight drive board and liquid crystal display |
| GB2524213A (en) * | 2013-03-20 | 2015-09-16 | Shenzhen China Star Optoelect | Backlight drive board and liquid crystal display |
| CN103198799B (en) * | 2013-03-20 | 2015-11-25 | 深圳市华星光电技术有限公司 | Backlight drive board and liquid crystal display |
| DE112013006696B4 (en) * | 2013-03-20 | 2017-05-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight driver board and LCD device |
| GB2524213B (en) * | 2013-03-20 | 2020-03-18 | Shenzhen China Star Optoelect | Backlight driving board and lcd device |
| CN109445189A (en) * | 2018-12-28 | 2019-03-08 | 深圳市英唐光显技术有限公司 | Light mixing structure for improving color gamut and visual acuity of display device |
| CN113409738A (en) * | 2021-05-25 | 2021-09-17 | 青岛海信医疗设备股份有限公司 | Backlight source circuit, control method thereof and display device |
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