CN100340907C - Straight down type backlight module of LCD - Google Patents
Straight down type backlight module of LCD Download PDFInfo
- Publication number
- CN100340907C CN100340907C CNB031482104A CN03148210A CN100340907C CN 100340907 C CN100340907 C CN 100340907C CN B031482104 A CNB031482104 A CN B031482104A CN 03148210 A CN03148210 A CN 03148210A CN 100340907 C CN100340907 C CN 100340907C
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- light
- diffuser plate
- circular
- fluorescent tube
- tubes
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Abstract
The present invention relates to a direct-down back light module which can be applied to a panel display. The direct-down back light module comprises a plurality of lamp tubes, a diffuser plate and a reflecting plate, wherein the lamp tubes are distributed in a selected distance in the space formed by the clamping of the diffuser plate and the reflecting plate; the diffuser plate is installed above the lamp tubes, and thereby, light emitted by the lamp tubes is scattered by the diffuser plate and is uniformly emitted from the upper surface of the diffuser plate; the reflecting plate is installed below the lamp tubes to reflect the light of the lamp tubes, the reflected light is upwards transferred to the diffuser plate by the reflecting plate, the upper surface of the reflecting plate is provided with a plurality of reflecting particles, and thus, the distribution of the reflected light is uniform.
Description
Technical field
The invention relates to a kind of back light module unit structure that is applied to flat-panel screens, particularly can provide the more down straight aphototropism mode set of uniformly light-emitting brightness in the membrane transistor LCD (TFT-LCD) about a kind of being applied to.
Background of invention
Along with the making thin-film electronic crystal technology is progressive fast, LCD has been owing to possessed advantages such as frivolous, power saving, no width of cloth ray, and a large amount of is applied to personal digital assistant device (PDA), notebook computer, digital still camera, takes the photograph in the various electronic products such as video recorder, mobile phone.Add the positive input research and development of industry and adopt the production equipment that maximizes, the quality of LCD is constantly promoted, and the lasting decline of price, more make the application of LCD enlarge rapidly.What deserves to be explained is,, need could produce the function that shows with module backlight because LCD is non-luminiferous display device.Be quality, tend to directly influence the image display quality of LCD with back light source performance, and most important assembly in the LCD of can saying so.
Please refer to Fig. 1, is example with the employed down straight aphototropism mode set 1 of present LCD, and its main element has comprised blooming piece 10, diffuser plate 12, reflecting plate 14 and plural tubes 16.Plural number tubes 16 is to be installed in the space of diffuser plate 12 belows, and arranged evenly with specific spacing.The light that sends by fluorescent tube 16, in being sent to diffuser plate 12 after, see through the scattering of diffuser plate 12, can make the more even of distribution of light, penetrate by diffuser plate 12 upper surfaces again.
In order further to promote the homogeneity and the brightness of light source, also can install above-mentioned blooming piece 10 at diffuser plate 12 upper surfaces, produce required diffusion, light enhancing effect.Common blooming piece 10 according to the difference of its function, can be divided into diffusion sheet (upper diffuser), brightening piece (brightness enhancedfilm; BEF) and down diffusion sheet (lower diffuser).The following diffusion sheet that mist degree is heavier is to be used for making the light of upwards being derived by diffuser plate 12 to produce scattering and distribute more evenly, and makes light comparatively soft.Described brightening piece then can be made of prismatic lens (prism) or polaroid (polarizer), is used for producing the effect of optically focused.As for the lighter last diffusion sheet of mist degree, except make distribution of light evenly, also can be used to protect the brightening piece of below, to prevent scratch in assembling process.
In addition, for the light that prevents fluorescent tube 16 towards the below loss, reflecting plate 14 also can be installed in the position below fluorescent tube 16, is used for light that fluorescent tube 16 is down dispersed, upwards reflexes to diffuser plate 12, to promote the service efficiency of light.In other words, in the space that fluorescent tube 16 is placed in diffuser plate 12 and reflecting plate 14 clampings, the light that fluorescent tube 16 is sent under the condition of avoiding the scattering ease to lose, upwards is incident to diffuser plate 12, and improves the luminescence efficiency of whole down straight aphototropism mode set 1.
It should be noted that the design of this kind down straight aphototropism mode set 1, still have many shortcomings.Please refer to Fig. 1, the light by fluorescent tube 16 penetrates mainly can transmit along two kinds of direct of travels.First kind of direct of travel is to diffuser plate 12 by fluorescent tube 16 direct irradiations; Second kind of direct of travel then is to expose to reflecting plate 14 by fluorescent tube 16, reflexes to diffuser plate 12 again.Because the brightness of light is to be inversely proportional to distance, therefore with regard to above-mentioned first kind of direct of travel, diffuser plate 12 lower surfaces that are positioned at directly over the fluorescent tube 16 can have stronger brightness, and top, fluorescent tube 16 left and right sides then can have more weak light luminance.As for, irradiation for second kind of direct of travel, because after through reflecting plate 14 reflections, most reflected light is still laid particular stress on the position that concentrates on directly over the fluorescent tube 16, be with light luminance at whole diffuser plate 12 lower surfaces, can present the difference contrast of light and shade along with the difference of position, and then influence the light source homogeneity of whole down straight aphototropism mode set 1.
Please refer to Fig. 2, this figure has shown the brightness situation that is measured on down straight aphototropism mode set 1.Find out that by knowing among the figure along with the increase of distance, the brightness of light also can present violent light and shade contrast.With the luminosity distribution situation of whole down straight aphototropism mode set 1, directly over fluorescent tube 16 positions, can have light luminance up to 9000 ANSI, but for the position between fluorescent tube 16 and the fluorescent tube 16, the light luminance of 4000 ANSI that then only have an appointment.In other words, even if see through the scattering process of diffuser plate 12 and blooming piece 10, it is even inadequately that the light of whole down straight aphototropism mode set 1 still distributes, and then cause the picture of whole display also to present the different Luminance Distribution of light and shade.
In order to solve the uneven problem of light, in known techniques, tend to diffuser plate 12 is carried out screen painting (screen) program, so that define the scattering particles pattern, further increase the effect of light scatter on its surface.But thus, additionally carry out also having increased the production cost of whole module backlight 1 printing process of diffuser plate 12 except needs.In addition, in known techniques, also can be through increasing the distance of above-mentioned diffuser plate 12, so that the light that allows fluorescent tube 16 be sent on the diffuser plate 12 is more even with fluorescent tube 16.But thus, the thickness of entire aphototropism mould 1 is increased, and can't reduce the thickness of whole LCD, make it meet compact trend.
Summary of the invention
Purpose of the present invention is providing a kind of more down straight aphototropism mode set of uniform source of light distribution that has.
Another object of the present invention is providing a kind of method that the down straight aphototropism mode set uniformity of luminance is increased, arrange the different reflective particle of density through on reflecting plate, being provided with, can change the angle of reflection ray, and make reflection ray concentrate on original dark position on the diffuser plate, and then promote the illuminance distribution of monoblock diffuser plate.
Another purpose of the present invention through the different reflective particle of size is set, can change the angle of reflection ray in that a kind of method that the down straight aphototropism mode set uniformity of luminance is increased is provided on reflecting plate, and promotes the illuminance distribution of monoblock diffuser plate.
A kind of module backlight comprises:
The plural number tubes is arranged evenly with selected spacing;
One diffuser plate is installed in the top of this plural number tubes, so that the light that is sent by those fluorescent tubes can be penetrated by this diffuser plate upper surface uniformly via the scattering of this diffuser plate; And
One reflecting plate, be installed in the below of this plural number tubes, in order to reflecting the light of those fluorescent tubes, and make the light of reflection upwards be sent to this diffuser plate, at this reflecting plate upper surface and have the circular-arc particle of the about 5-100 micron of a plurality of diameters, can make more even that above-mentioned reflection ray distributes.
The diameter of described circular-arc particle, be to increase and phase down along with the distance between this circular-arc particle and contiguous this fluorescent tube, make this circular-arc particle that is positioned under this fluorescent tube have bigger diameter, this circular-arc particle that is positioned at these fluorescent tube both sides has less diameter.
Described circular-arc particle, this circular-arc particle alignment that is distributed under each this fluorescent tube is the tightst, extends this circular-arc particle that distributes along these fluorescent tube both sides and then arranges gradually loose.
Described module backlight wherein at the said reflection plate upper surface and have a reflection coating layer, is to coat those reflective particle surfaces, and being used for reflection wavelength is the light of 400-700 nanometer, and this reflection coating layer can be made of aluminium, silver or its alloy.
The present invention discloses a kind of down straight aphototropism mode set that is applied to flat-panel screens, comprises following elements at least: plural tubes is arranged evenly with selected spacing; One diffuser plate is installed in the top of plural tubes, so that the light that is sent by those fluorescent tubes can be penetrated by the diffuser plate upper surface uniformly via the scattering of diffuser plate; An and reflecting plate, be installed in the below of plural tubes, in order to reflecting the light of those fluorescent tubes, and make the light of reflection upwards be sent to diffuser plate, at the reflecting plate upper surface and have a plurality of reflective particles, thereby can make more even that above-mentioned reflection ray distributes.
Description of drawings
Fig. 1 is for being applied to the down straight aphototropism mode set sectional view of display in the conventional art;
Fig. 2 has shown the distribution of light sources situation of traditional down straight aphototropism mode set;
Fig. 3 is the down straight aphototropism mode set sectional view according to first embodiment of the invention;
Fig. 4 has shown the distribution of light sources situation of module backlight in the first embodiment of the invention; And
Fig. 5 is the down straight aphototropism mode set sectional view according to second embodiment of the invention.
The figure number table of comparisons:
Down straight aphototropism mode set 1
Reflecting plate 14 plural tubes 16
Down straight aphototropism mode set 3
Reflecting plate 33 reflective particles 331
Down straight aphototropism mode set 5
Reflecting plate 53 reflective particles 531
Embodiment
The invention provides a kind of down straight aphototropism mode set that is applied to membrane transistor LCD (TFT-LCD).This kind down straight aphototropism mode set is with plural tubes, and is arranged evenly in by the space that diffuser plate and reflecting plate constituted.Through make a plurality of sizes or the different reflective particle of density degree at the reflecting plate upper surface, can change catoptrical direction and component, make reflection ray concentrate on the diffuser plate dark position as far as possible, and make distribution of light sources more even of entire aphototropism mould.Shown in relevant of the present invention being described in detail as follows.
First embodiment
Please refer to Fig. 3, this figure has shown the down straight aphototropism mode set 3 that is applied to membrane transistor LCD (TFT-LCD) provided by the present invention.As shown in FIG., the main element of this down straight aphototropism mode set 3 has comprised plural tubes 31, a diffuser plate 32 and a reflecting plate 33.Described plural tubes 31 is to be distributed in the space by diffuser plate 32 and 33 clampings of reflecting plate with selected spacing line.32 tops that are installed in plural tubes 31 of diffuser plate are so that the light that is sent by those fluorescent tubes 31 can be penetrated by diffuser plate 32 upper surfaces uniformly via the scattering of diffuser plate 32.As for, 33 belows that are installed in plural tubes 31 of reflecting plate, in order to reflecting the light that those fluorescent tubes 31 are dispersed downwards, and make reflection ray upwards be sent to diffuser plate 32.
At reflecting plate 33 upper surfaces and made a plurality of reflective particles 331, with through the path of adjusting reflection ray, the luminous uniformity coefficient of promoting module 3 backlight.The reflective particle 331 that is distributed under each tubes 31 is arranged the tightst, gradually loose as for 331 arrangements of reflective particle of extending distribution along fluorescent tube 31 both sides outward, so that allow near the adjacent lamp tube 31 reflection ray, conduct to diffuser plate 32 lower surfaces that are positioned at fluorescent tube 31 both sides, to reach the effect of light source homogenising as far as possible.In other words, because diffuser plate 31 lower surfaces 31 of two tubes, comparatively dark often position, therefore through the distribution density of adjusting reflective particle 331, can make near the reflected light intent propagation position comparatively dark fluorescent tube 31, and make the irradiation of monoblock diffuser plate 32 distribute more average to fluorescent tube 31 both sides.
In preferred embodiment, above-mentioned reflective particle 331 is made of circular-arc particle, and has the diameter of about 5-100 micron.And, in order further to promote the reflection efficiency of these reflective particles 331 and reflecting plate 33 itself, can make a reflection coating layer 332 at said reflection plate 33 upper surfaces, coat those reflective particles 331 and reflecting plate 33 surfaces uniformly.Generally speaking, because the ultraviolet ray of wavelength below 400 nanometers, can make the material deterioration of diffuser plate 32, be mainly to be that to be used for reflection wavelength be the light of 400-700 nanometer, and can adopt the metal of aluminium, silver, alloy or other high reflectance to constitute with herein reflection coating layer 332.
In addition, what particularly point out is that above-mentioned reflective particle 331 can directly be made in reflecting plate 33 upper surfaces through the mode of screen painting (screen) or direct injection (injection).And,, in actual applications, also reflective particle 331 can be defined as sexangle or foursquare particle pattern although reflective particle 331 is made of circular-arc particle in the above-described embodiments.
For the further homogeneity and the brightness of lifting module 3 light sources backlight, and can be used for producing required diffusion, light enhancing effect at diffuser plate 32 upper surfaces installing blooming piece 34.Blooming piece 34 herein can be divided into diffusion sheet (upper diffuser), brightening piece (brightnessenhanced film according to the difference of its function; BEF) and down diffusion sheet (lower diffuser).By the heavier following diffusion sheet of mist degree, can make the light of upwards deriving produce scattering and distribute more evenly by diffuser plate 32; Described brightening piece then can be made of prismatic lens (prism) or polaroid (polarizer), is used for producing the effect of optically focused; As for the lighter last diffusion sheet of mist degree, except make distribution of light evenly, also can be used to protect the brightening piece of below, to prevent scratch in assembling process.
Please refer to Fig. 4, this figure shown use above-mentioned reflecting plate 33 with reflective particle 331 after, the Luminance Distribution situation that is measured on the down straight aphototropism mode set 3.Find out that by knowing among the figure along with the increase of distance, each distribution of light of putting is comparatively even on the module 3 backlight, and overall brightness is gradually in unanimity.With (the brightest zone) directly over fluorescent tube 31 positions, light luminance is about 9000ANSI; As for the position (the darkest zone) of 31 of two tubes, the light luminance of the 7000ANSI that then still has an appointment.In other words, situation (with reference to Fig. 2) in the known techniques, module backlight 3 provided by the present invention, can make original luminance difference up to 5000ANSI, be reduced to 2000ANSI, and significantly promoted the distributing homogeneity of integrated light source, and then make the picture of display have more uniform Luminance Distribution.
Second embodiment
Except the mode of the different reflective particle 331 of density degree is arranged in above-mentioned utilization, also can reach the effect that changes reflected light direction and component through the size of adjusting reflective particle 331.Please refer to Fig. 5, this figure has shown the disclosed another kind of down straight aphototropism mode set 5 of the present invention.The main element of this down straight aphototropism mode set 5 has comprised plural tubes 51, a diffuser plate 52 and a reflecting plate 53.Diffuser plate 52 is the tops that are installed in plural tubes 51, so that the light that allows fluorescent tube 51 send can be penetrated by diffuser plate 52 upper surfaces uniformly.53 belows that are installed in plural tubes 51 of reflecting plate are in order to reflect the light that those fluorescent tubes 51 are dispersed downwards.
At reflecting plate 53 upper surfaces and made a plurality of equally distributed reflective particles 531, adjusting the path of reflection ray, and the luminous uniformity coefficient of promoting module 5 backlight.It should be noted that, the reflective particle 531 that is distributed under each tubes 51 has bigger diameter, extend 531 of reflective particles that distribute along this fluorescent tube 51 to both sides and have diminishing diameter, so that allow near the adjacent lamp tube 51 reflection ray, conduct to diffuser plate 52 lower surfaces that are positioned at fluorescent tube 51 both sides, to reach the effect of light source homogenising as far as possible.In other words, the reflective particle that is positioned under the fluorescent tube 51 has maximum diameter, and the reflective particles that are positioned in the middle of two tubes 51 then have minimum diameter.And,, can make near the reflected light intent propagation position comparatively dark fluorescent tube 51, and make the irradiation of monoblock diffuser plate 52 distribute more average to fluorescent tube 51 both sides through the size of adjusting reflective particle 531.
As above-mentioned, reflective particle 531 is made of circular-arc particle, and has the diameter of about 5-100 micron.And,, at said reflection plate 53 upper surfaces and made a reflection coating layer 532, coat uniformly on those reflective particles 531 and reflecting plate 53 surfaces in order further to promote reflection efficiency.It is the light of 400-700 nanometer that reflection coating layer 532 herein also is used for reflection wavelength, and can adopt the metal of aluminium, silver, alloy or other high reflectance to constitute.
When making above-mentioned reflective particle 531, can be defined in reflecting plate 53 upper surfaces by the mode of screen painting (screen) or direct injection (injection) equally.And,, in actual applications, also reflective particle 531 can be defined as sexangle or foursquare particle pattern although reflective particle 531 is made of circular-arc particle in the above-described embodiments.And, make the reflective particle 531 that is distributed under the fluorescent tube 51 have bigger size, has diminishing size along fluorescent tube 51 to 531 of the reflective particles that both sides extend to distribute, so that allow reflection ray conduct to be positioned at diffuser plate 52 lower surfaces of fluorescent tube 51 both sides as far as possible.Same, also can install the blooming piece 54 that has comprised diffusion sheet, brightening piece and following diffusion sheet at diffuser plate 52 upper surfaces, to produce required scattering and light enhancing effect.
Compared to traditional module backlight, back light module unit structure provided by the present invention has the following advantages:
(1) vary in size or reflective particle that density is different through making at the reflecting plate upper surface, can make near the reflected light of adjacent lamp tube, cover is to diffuser plate surface dark between fluorescent tube and fluorescent tube as far as possible, and that the irradiation that can make monoblock diffuser plate lower surface distributes is more even, and then makes the distribution of light sources of whole down straight aphototropism mode set more even.
(2) carrying out surface treatment and directly form required reflective particle owing to The present invention be directed to reflecting plate, is more convenient than the mode of in the known techniques diffuser plate being processed with meeting on processing procedure, and also more cheap on the cost.
Though the present invention illustrates as above with preferred embodiments, so it is not in order to limit the present invention's spirit and invention entity, only to terminate in the foregoing description that.Be with, the modification of in not breaking away from spirit of the present invention and scope, being done, all should be included in the scope that claims protect.
Claims (4)
1. module backlight is characterized in that comprising:
The plural number tubes is arranged evenly with selected spacing;
One diffuser plate is installed in the top of this plural number tubes, so that the light that is sent by those fluorescent tubes can be penetrated by this diffuser plate upper surface uniformly via the scattering of this diffuser plate; And
One reflecting plate, be installed in the below of this plural number tubes, in order to reflecting the light of those fluorescent tubes, and make the light of reflection upwards be sent to this diffuser plate, at this reflecting plate upper surface and have the circular-arc particle of the about 5-100 micron of a plurality of diameters, can make more even that above-mentioned reflection ray distributes.
2. module backlight as claimed in claim 1, it is characterized in that, the diameter of above-mentioned circular-arc particle, be to increase and phase down along with the distance between this circular-arc particle and contiguous this fluorescent tube, make this circular-arc particle that is positioned under this fluorescent tube have bigger diameter, this circular-arc particle that is positioned at these fluorescent tube both sides has less diameter.
3. module backlight as claimed in claim 1 is characterized in that above-mentioned circular-arc particle, and this circular-arc particle alignment that is distributed under each this fluorescent tube is the tightst, extends this circular-arc particle that distributes along these fluorescent tube both sides and then arranges gradually loose.
4. module backlight as claimed in claim 1, it is characterized in that at the said reflection plate upper surface and have one reflecting coating layer, be to coat those circular-arc particle surfaces, being used for reflection wavelength is the light of 400-700 nanometer, and this reflection coating layer can be made of aluminium, silver or its alloy.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100964026A CN100514155C (en) | 2003-06-27 | 2003-06-27 | Directly-down back light module unit of LCD |
| CNB031482104A CN100340907C (en) | 2003-06-27 | 2003-06-27 | Straight down type backlight module of LCD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031482104A CN100340907C (en) | 2003-06-27 | 2003-06-27 | Straight down type backlight module of LCD |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100964026A Division CN100514155C (en) | 2003-06-27 | 2003-06-27 | Directly-down back light module unit of LCD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1567061A CN1567061A (en) | 2005-01-19 |
| CN100340907C true CN100340907C (en) | 2007-10-03 |
Family
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031482104A Expired - Lifetime CN100340907C (en) | 2003-06-27 | 2003-06-27 | Straight down type backlight module of LCD |
| CNB2007100964026A Expired - Lifetime CN100514155C (en) | 2003-06-27 | 2003-06-27 | Directly-down back light module unit of LCD |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100964026A Expired - Lifetime CN100514155C (en) | 2003-06-27 | 2003-06-27 | Directly-down back light module unit of LCD |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN100340907C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101332317B1 (en) | 2007-12-27 | 2013-11-22 | 엘지디스플레이 주식회사 | Backlight unit and liquid crystal display using the same |
| CN104089220B (en) * | 2014-06-30 | 2017-01-25 | 京东方科技集团股份有限公司 | Straight down type backlight source module |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1116528A (en) * | 1997-06-20 | 1999-01-22 | Jeol Ltd | Ultra-high vacuum apparatus |
| US6454452B1 (en) * | 1999-04-22 | 2002-09-24 | Mitsubishi Denki Kabushiki Kaisha | Backlight for liquid crystal display device |
| CN1400499A (en) * | 2001-07-31 | 2003-03-05 | 日本电气株式会社 | Back lighting unit irradiating object homogeneously and its liquid crystal display board device |
| CN1409161A (en) * | 2001-09-19 | 2003-04-09 | 惠和株式会社 | Reflective thin sheet and back light assembly using said sheet |
| CN1421727A (en) * | 2001-11-30 | 2003-06-04 | 奇美电子股份有限公司 | Multiple-angle reflecting plate for back lighting module |
-
2003
- 2003-06-27 CN CNB031482104A patent/CN100340907C/en not_active Expired - Lifetime
- 2003-06-27 CN CNB2007100964026A patent/CN100514155C/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1116528A (en) * | 1997-06-20 | 1999-01-22 | Jeol Ltd | Ultra-high vacuum apparatus |
| US6454452B1 (en) * | 1999-04-22 | 2002-09-24 | Mitsubishi Denki Kabushiki Kaisha | Backlight for liquid crystal display device |
| CN1400499A (en) * | 2001-07-31 | 2003-03-05 | 日本电气株式会社 | Back lighting unit irradiating object homogeneously and its liquid crystal display board device |
| CN1409161A (en) * | 2001-09-19 | 2003-04-09 | 惠和株式会社 | Reflective thin sheet and back light assembly using said sheet |
| CN1421727A (en) * | 2001-11-30 | 2003-06-04 | 奇美电子股份有限公司 | Multiple-angle reflecting plate for back lighting module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101042500A (en) | 2007-09-26 |
| CN1567061A (en) | 2005-01-19 |
| CN100514155C (en) | 2009-07-15 |
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Granted publication date: 20071003 |