CN1567065A - Backlight source - Google Patents
Backlight source Download PDFInfo
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- CN1567065A CN1567065A CN 03148674 CN03148674A CN1567065A CN 1567065 A CN1567065 A CN 1567065A CN 03148674 CN03148674 CN 03148674 CN 03148674 A CN03148674 A CN 03148674A CN 1567065 A CN1567065 A CN 1567065A
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- backlight
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Abstract
This invention relates to aphototropism source, which is located under the display panel. It comprises multiple parallel U tube with a high-pressure electrode and low-pressure electrode. And the U shaped high-pressure electrode is uniformly located on both sides of the display panel.
Description
Technical field
The present invention relates to a kind of direct type backlight module (direct-type backlight unit), specifically, relate to a kind of backlight (backlight source) that is used in this backlight module.
Background technology
Because liquid crystal itself is not luminous, therefore backlight module is LCD (liquid crystaldisplay, LCD) key components and parts of panel, its major function provides brightness and fully reaches the light source that is evenly distributed, so that the normal display image of LCD panel.Along with the LCD panel is widely used in numerous electronic products with development potentiality, as monitor (monitor), notebook computer, digital camera, projector or the like, the demand of backlight module and related components thereof is in sustainable growth.
Generally speaking, backlight module can be divided into straight-down negative (direct-type) and two kinds of designs of marginal mode (edge-type), wherein the straight-down negative design is with backlight, for example fluorescent tube be arranged at backlight module under, and can use the fluorescent tube more than two to increase the intensity of light source, therefore be applicable to the display panel of higher brightness demand or large-size, for example LCD monitor or LCD TV.
Please refer to Fig. 1, Fig. 1 is the structural representation of the backlight 10 of existing direct type backlight module.As shown in Figure 1, existing backlight 10 is arranged in the housing (bezel) 12 of a display panel (not being shown among Fig. 1) below, it mainly comprises many straight light tubes 14 that are arranged in parallel in housing 12, and a control circuit (not being shown among Fig. 1) that is used for lighting corresponding straight light tube 14 respectively, be the drive pattern that single control circuit drives single straight light tube 14.Wherein, display panel can be a LCD panel, housing 12 can be a plastic cement shell, an aluminium frame or a sheet metal, and straight light tube 14 main cathode fluorescent tube (the cold cathode fluorescent lamp that use with the design of low-pressure mercury fluorescent light of the backlight 10 of large size panel, CCFL), the principle of luminosity of cathode fluorescent tube is quite similar with general daylight lamp, be to utilize field effect excited inert gas atom and mercury atom collision to disengage short wavelength's ultraviolet light, through after coating the fluorophor of tube wall, just can be converted into visible light.
In addition, each straight light tube 14 comprises that all high-field electrode (high voltage electrode) 14a and who is electrically connected on a high-voltage conducting wires (not being shown among Fig. 1) is electrically connected on a ground wire (groundwire, be not shown among Fig. 1) low-field electrode 14b, and the high-field electrode 14a of each straight light tube 14 and low-field electrode 14b are arranged at the two ends of display panel respectively.Control circuit all comprises an AC/DC adapter (alternating current/direct current adapter, AC/DC adapter is not shown among Fig. 1), is used for an AC power is converted to a direct current power supply and a rectification; One direct current/alternating-current converter (inverter claims inverter again) 16 is used for direct supply is converted to the AC power of high voltagehigh frequency, to drive the straight light tube 14 of backlight 10; And a DC-DC converter (converter is not shown among Fig. 1), be used for above-mentioned direct supply is converted to the required operating voltage of system.Wherein, each AC/DC transverter 16 all is electrically connected on corresponding high-voltage conducting wires and ground wire, provide high pressure and low pressure to the high-field electrode 14a and the low-field electrode 14b of corresponding straight light tube 14 by high-voltage conducting wires respectively with ground wire, whereby each straight light tube 14 because of voltage difference (voltage difference) thus producing discharge process is lighted and is formed light source.It should be noted that the DC/AC transverter 16 that is used for carrying out power source conversion in the existing backlight 10, comprise a transformer (transformer) usually in addition, use for the magnitude of voltage of conversion DC current.
The backlight 10 of existing direct type backlight module uses many straight light tubes 14 mostly, to satisfy the requirement of high brightness, yet the quantity of straight light tube 14 for a long time, the transverter 16 and the transformer (transformer) that are used for driving fluorescent tube are also wanted corresponding increase, and not only power consumption is many and improved cost of products for these.In addition, for lightweight, usually backlight 10 is installed in the narrow confined space (that is housing 12), and the high-field electrode 14a of existing each straight light tube 14 and low-field electrode 14b are arranged at the both sides of display panel respectively, because high-field electrode 14a is normal and DC/AC transverter 16 places homonymy, so easily heating and temperature are higher, therefore the heat that is produced when operation often can't successfully distribute and constantly accumulation, causes the temperature inequality at display panel two ends.In case the running time is long slightly, not only influences the normal operation of display panel and cause display quality to reduce (for example the picture of subregion is easy to generate and rocks or phenomenon such as flicker), the serviceable life of element around the easier reduction greatly.
Summary of the invention
The present invention aims to provide a kind of backlight of the direct type backlight module that can address the above problem.
In preferred implementation of the present invention, disclosed a kind of backlight of direct type backlight module, this backlight is arranged at the below of a display panel, and comprise many U type fluorescent tubes that are parallel to each other, each U type fluorescent tube all comprises a high-field electrode and a low-field electrode, and the high-field electrode of above-mentioned U type fluorescent tube evenly is arranged at the both sides of above-mentioned display panel.
Because backlight of the present invention is to replace existing straight light tube with U type fluorescent tube, therefore can reduces the fluorescent tube quantity of half approximately, and can reach the display panel cool effect because of reducing fluorescent tube quantity.In addition, also can reduce the quantity of transverter transformer employed, thereby reduce cost of products with it.Moreover backlight of the present invention is concentrated the two ends of the staggered display panel that is placed in of high-field electrode of U type fluorescent tube to reduce thermal source, therefore can effectively reduce bulk temperature, and improve fluorescent tube efficient.
Description of drawings
Fig. 1 is the structural representation of the backlight of existing direct type backlight module;
Fig. 2 is the structural representation of the backlight of direct type backlight module of the present invention;
Fig. 3 is the side-looking exploded view of direct type backlight module of the present invention;
Fig. 4 is the structural representation of the direct-light-type backlight of second embodiment of the invention.
The drawing reference numeral explanation
10 backlights, 12 housings
14 straight light tube 14a high-field electrodes
14b low-field electrode 16AC/DC transverter
30 backlights, 32 display panels
Housing before the 34a housing 34b
36U type fluorescent tube 36a high-field electrode
36b low-field electrode 38 transverters
40 direct type backlight modules
42 diffusion sheet plates, 44 diffuser plates
46 reflecting plates, 48 prisms
Embodiment
Please refer to Fig. 2 to Fig. 3, Fig. 2 is the structural representation of backlight 30A of the direct type backlight module of first embodiment of the invention, and Fig. 3 is the side-looking exploded view of the direct type backlight module 40 of Fig. 2.As shown in Figure 2, backlight 30A of the present invention is arranged in the back housing 34a of a display panel 32 (as shown in Figure 3) below, in order to provide a light source to display panel 32.Backlight 30A of the present invention mainly comprises many U type fluorescent tubes 36, they are arranged in the housing 34a of back abreast, the opening of adjacent two U type fluorescent tubes 36 is respectively towards the both sides of display panel 32, and the fluorescent tube arm of adjacent two U type fluorescent tubes 36 is provided with (as shown in Figure 3) for disperseing, and each U type fluorescent tube 34 all comprises a high-field electrode 36a and a low-field electrode 36b.
It should be noted that backlight of the present invention mainly is the both sides that the high-field electrode 36a of U type fluorescent tube 36 evenly are arranged at backlight 30, disperse to be provided with, avoid thermal source to concentrate with the high-field electrode 36a that will be easy to generate thermal source.
In addition, backlight 30 of the present invention also comprises a plurality of control circuits that are electrically connected on a power supply unit (power supply all is not shown among Fig. 2), is used to provide electric current and drives corresponding U type fluorescent tube 36.Wherein, each control circuit all comprises a transverter 38 (for example one direct current/alternating-current converter), one width modulation (pulse width modulation, PWM) transverter, or the high-field electrode 36a that is electrically connected on corresponding U type fluorescent tube 36 resonance parallel loads (the series resonantparallel loaded that connects with one of low-field electrode 36b, SPRL) transverter is used for converting direct supply to AC power or utilizing a transformer (not being shown among Fig. 2) to change the magnitude of voltage of DC current.Transverter 38 provides high pressure and low pressure to the high-field electrode 36a and the low-field electrode 36b of corresponding U type fluorescent tube 36 respectively, makes each U type fluorescent tube 36 to produce discharge process by means of voltage difference and lights, to form light source.
As shown in Figure 3, direct type backlight module 40 of the present invention comprises a diffusion sheet plate (diffuser) 42, is arranged between U type fluorescent tube 36 and the display panel 32; One diffuser plate (Light diffuser plate) 44 is arranged between U type fluorescent tube 36 and the diffusion sheet plate 42; One reflecting plate (reflecting plate) 46 is arranged at the below of U type fluorescent tube 36; One shell (not being shown among Fig. 3) is arranged at reflecting plate 46 belows and coats around the reflecting plate 46; And housing 34b before, this frame can combine with back housing 34a and assemble display panel 32, diffusion sheet plate 42, diffuser plate 44, reflecting plate 46, and backlight 30.Wherein, reflecting plate 46 is to be used for the light source that U type fluorescent tube 36 is produced is upwards reflexed to diffuser plate 44, to increase the utilization rate of light, and then provide a preferable brightness to export, diffuser plate 44 is to be used for the light source that U type fluorescent tube 36 is produced is scattered to diffusion sheet plate 42, diffusion sheet plate 42 can be with the further scattering of the light that passes through, to provide more homodisperse light source to display panel 32.In addition, generally can establish at least one prism (prism) 48 in addition on diffusion sheet plate 42, with the difference of further correction irradiation intensity, the light that display panel 32 is received can have uniform irradiation intensity distributions.
In preferred implementation of the present invention, each U type fluorescent tube 36 is all a cathode fluorescent tube, and U type fluorescent tube 36 is not arranged in the housing 34a of back mutually alternately.The diffuser plate 42 general polyester (polyester that use, PET) or polycarbonate (polycarbonate, PC) material constitutes, diffuser plate 44 can be by poly-methyl first acrylate material or polycarbonate (polycarbonate, PC) material constitutes, and reflecting plate 46 can be made of aluminum metal or alloy, foaming PET film or PC resin.
Then as shown in Figure 4, Fig. 4 is the structural representation of the direct-light-type backlight 30B of second embodiment of the invention.The main parts size of direct-light-type backlight 30B shown in Figure 4 and direct-light-type backlight 30A's shown in Figure 2 is roughly the same, different parts only is that the fluorescent tube arm of adjacent two U type fluorescent tubes 36 among Fig. 2 is provided with for disperseing, promptly not interlaced, and the fluorescent tube arm of adjacent two U type fluorescent tubes 36 is interlaced setting among Fig. 4, to provide brightness more uniform backlight.In addition, in embodiments of the present invention, be that opening with adjacent two U type fluorescent tubes 36 describes towards the both sides of display panel 32 respectively, yet, design of the present invention is not limited thereto, the setting of the opening of U type fluorescent tube of the present invention can also be decided on product demand or specification, evenly concentrates the various U type configuration of tube modes of purpose with avoiding thermal source as long as can reach brightness, all is applicable to the present invention.
In sum, compare with the backlight of existing direct type backlight module, the present invention mainly uses U type fluorescent tube to replace existing straight light tube, therefore can reduce the fluorescent tube quantity of half in the backlight module of same size approximately, and can reach the display panel cool effect because of reducing fluorescent tube quantity.In addition, also reduced the quantity of transverter and its employed transformer, thereby reduced cost of products.Moreover backlight of the present invention is the two ends with the staggered display panel that is placed in of high-field electrode of U type fluorescent tube, thereby has avoided thermal source to concentrate, and therefore can effectively reduce bulk temperature, and improves fluorescent tube efficient.
Below only invention has been described in conjunction with preferred implementation of the present invention, allly changes and modify by the described content of the present patent application file being equal to of making, and all is encompassed within the present invention's scope required for protection.
Claims (11)
1. a backlight (backlight source), be arranged at the below of a display panel (display panel), this backlight comprises many U type fluorescent tubes (lamp) that are parallel to each other, each U type fluorescent tube all comprises a high-field electrode (high voltage electrode) and a low-field electrode, and the high-field electrode of above-mentioned U type fluorescent tube evenly is arranged at the both sides of display panel.
2. backlight as claimed in claim 1, wherein this backlight is applied in the bottom-lighting type back light module (direct-type unint).
3. backlight as claimed in claim 2, wherein above-mentioned direct type backlight module comprise that in addition one is arranged at the diffusion sheet plate (diffuser) between above-mentioned U type fluorescent tube and the display panel, are used for the light source that above-mentioned U type fluorescent tube is produced is scattered to display panel; One is arranged at the diffuser plate (Light Diffuser Plate) between above-mentioned U type fluorescent tube and the diffusion sheet plate, is used for the light source that U type fluorescent tube is produced is sent to above-mentioned diffusion sheet plate; And a reflecting plate (reflecting plate) that is arranged at above-mentioned U type fluorescent tube below, the source reflection that is used for above-mentioned U type fluorescent tube is produced is to above-mentioned diffuser plate.
4. backlight as claimed in claim 3, wherein above-mentioned direct type backlight module comprises that in addition one is arranged at said reflection plate below and coats shell (housing) around this reflecting plate, and a housing (bezel) that is used for assembling above-mentioned display panel and backlight.
5. backlight as claimed in claim 1, wherein above-mentioned each U type fluorescent tube comprise a fluorescent tube (cold cathode fluorescent lamp, CCFL).
6. backlight as claimed in claim 1, the opening of wherein adjacent two U type fluorescent tubes are respectively towards the both sides of above-mentioned display panel.
7. backlight as claimed in claim 6, the fluorescent tube arm of wherein adjacent two U type fluorescent tubes is interlaced setting.
8. backlight as claimed in claim 6, the fluorescent tube arm of wherein adjacent two U type fluorescent tubes is provided with for disperseing.
9. backlight as claimed in claim 1, wherein this backlight comprises a power supply unit (power supply) in addition, is used to provide electric current; And a control circuit that is electrically connected on this power supply unit, be used for driving above-mentioned backlight.
10. backlight as claimed in claim 9, wherein above-mentioned control circuit comprise at least one high-field electrode of corresponding U type fluorescent tube and transverter (inverter) of low-field electrode of being electrically connected on.
11. backlight as claimed in claim 10, wherein above-mentioned transverter comprises an AC/DC (direct current/alternating current, DC/AC) transverter, one width modulation (pulse widthmodulation, PWM) transverter, or series connection resonance parallel loads (series resonant parallelloaded, a SPRL) transverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03148674 CN1567065A (en) | 2003-06-17 | 2003-06-17 | Backlight source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03148674 CN1567065A (en) | 2003-06-17 | 2003-06-17 | Backlight source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1567065A true CN1567065A (en) | 2005-01-19 |
Family
ID=34472344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03148674 Pending CN1567065A (en) | 2003-06-17 | 2003-06-17 | Backlight source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1567065A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100367094C (en) * | 2005-02-02 | 2008-02-06 | 友达光电股份有限公司 | Positioning structure of fluorescent tube |
| CN100399147C (en) * | 2005-06-03 | 2008-07-02 | 友达光电股份有限公司 | Backlight module and its tube support |
| CN100432797C (en) * | 2005-11-18 | 2008-11-12 | 三垦电气株式会社 | Back light source device |
| CN100460957C (en) * | 2005-06-24 | 2009-02-11 | 奇菱科技股份有限公司 | Backlight module assembly and its light tube device |
-
2003
- 2003-06-17 CN CN 03148674 patent/CN1567065A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100367094C (en) * | 2005-02-02 | 2008-02-06 | 友达光电股份有限公司 | Positioning structure of fluorescent tube |
| CN100399147C (en) * | 2005-06-03 | 2008-07-02 | 友达光电股份有限公司 | Backlight module and its tube support |
| CN100460957C (en) * | 2005-06-24 | 2009-02-11 | 奇菱科技股份有限公司 | Backlight module assembly and its light tube device |
| CN100432797C (en) * | 2005-11-18 | 2008-11-12 | 三垦电气株式会社 | Back light source device |
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