CN1963627A - Backlight assembly - Google Patents
Backlight assembly Download PDFInfo
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- CN1963627A CN1963627A CN 200510101218 CN200510101218A CN1963627A CN 1963627 A CN1963627 A CN 1963627A CN 200510101218 CN200510101218 CN 200510101218 CN 200510101218 A CN200510101218 A CN 200510101218A CN 1963627 A CN1963627 A CN 1963627A
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- brightness
- fluorescent tube
- module backlight
- fluorescent
- backlight according
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Abstract
This invention provides one aphototropism module set, which comprises one shell, one light conductive board set inside shell; one reflection slice set between shell and light conductive board; multiple lamp tubes through conductive board; multiple light sensor device to sense the relative tube brightness; one comparing computation device to process signals; multiple drive circuit to receive feedback signals of the computation device to separately adjust tube current to make the tube brightness and preset even value brightness to improve tube brightness even property.
Description
[technical field]
The present invention relates to a kind of module backlight that is applied to field of liquid crystal display.
[background technology]
LCD is a kind of passive type display device, and it does not have the characteristics of luminescence, need provide module backlight to realize Presentation Function for it.
Module backlight needs higher brightness, and its outgoing light homogeneity will reach predetermined demand, thereby promotes the visual effect of color contrast, full frame regional luminance effect and the complete machine of the LCD that adopts this module backlight.
Seeing also Fig. 1, is the module backlight of prior art and the structural representation of liquid crystal panel.This module 1 backlight is arranged at the below of liquid crystal board 16, and this module 1 backlight comprises: a housing 11; A plurality of fluorescent tubes 13, it is arranged in the room 12 of this housing 11 abreast; One diffuser plate 14 is arranged at the top of these a plurality of fluorescent tubes 13; One blooming piece 15 is arranged at the top of this diffuser plate 14.
This housing 11 is a plastic housing, an aluminium frame or a sheet metal.
Diffuser plate 14 is mainly used to make the light diffusion evenly, generally, it has atomized surface effect, polynary ester (the Polyester of general use, PET) or polycarbonate (Polycarbonate, PC) material constitutes, its thickness is between 0.11 to 0.15 centimetre (cm), and blooming piece 15 has optically focused and the effect that increases brightness, and it generally also adopts polynary ester or polycarbonate material to constitute.It should be noted that quantity that diffuser plate 14 and blooming piece 15 are set and the visual processing procedure of order or customer demand give additions and deletions or adjustment.
When light after a plurality of fluorescent tubes 13 penetrate, cooperate the enhancing effect of diffuser plate 14 and blooming piece 15 again, can produce preferable distribution of light sources, improve the image display quality of liquid crystal board 16.Yet,, influence imaging results because fluorescent tube in manufacturing process or the congenital difference of itself, though make every tubes utilize identical curtage to drive, still can obtain different brightness output, and then cause the display brightness of entire aphototropism mould inhomogeneous.
[summary of the invention]
In view of this, provide the uniform module backlight of a kind of lighting tube brightness real for necessary.
A kind of module backlight, it comprises:
One housing;
One light guide plate is arranged in this housing;
One reflector plate is arranged between this housing and the light guide plate;
A plurality of fluorescent tubes are arranged in this light guide plate;
A plurality of light sensing apparatus, it is corresponding with these a plurality of fluorescent tubes respectively, in order to sensing the brightness of corresponding fluorescent tube;
A plurality of drivings loop, its respectively with the corresponding connection of these a plurality of fluorescent tubes, in order to drive to connect fluorescent tube shinny; And
One comparison operation device, wherein, when the fluorescent tube that the output current driving of driving loop is connected is shinny, the brightness of light sensing apparatus sensing this fluorescent tube corresponding with this fluorescent tube also produces a signal and delivers to this comparison operation device, the comparison operation device is compared a plurality of signals and the default mean value of a plurality of fluorescent tubes, this comparison operation device can transmit a plurality of feedback signals to pairing driving loop, corresponding lamp tube current is adjusted in a plurality of drivings loop more respectively, makes that the brightness of a plurality of fluorescent tubes is consistent with the pairing brightness value of default mean value.
Compared to prior art, described module backlight utilizes the actual output brightness of each fluorescent tube of light sensing apparatus sensing, utilize the comparison operation device that the intrinsic brilliance signal and the default mean value of fluorescent tube are compared again, and transmit a plurality of feedback signals to pairing driving loop, drive the loop and adjust corresponding lamp tube current more respectively, make that the brightness of fluorescent tube is consistent with the pairing brightness value of default mean value, thereby improve the homogeneity of lamplight brightness.
[description of drawings]
Fig. 1 is the module backlight of prior art and the floor map of liquid crystal panel.
Fig. 2 is the schematic perspective view of the present invention module first embodiment backlight.
Fig. 3 be among Fig. 2 module backlight along the III-III schematic cross-section.
Fig. 4 is the part schematic perspective view of the present invention module first embodiment backlight.
Fig. 5 is the function connection diagram of the present invention module first embodiment backlight.
Fig. 6 is the function connection diagram of the present invention module second embodiment backlight.
[embodiment]
Please refer to Fig. 2, Fig. 3 and Fig. 4, first embodiment of the present invention's module 2 backlight comprises: a housing 21; One light guide plate 26 is arranged in this housing 21; One reflector plate 22 is arranged between this housing 21 and the light guide plate 26; A plurality of fluorescent tube 23A, 23B, 23C and 23D are arranged in this light guide plate 26, in this fluorescent tube 23A, 23B, the below of 23C and 23D respectively is provided with a through hole 29; One blooming piece 25 is arranged at the top of this light guide plate 26; A plurality of light sensing apparatus 20A, 20B, 20C, 20D are arranged at outside this housing 21, and relative with this through hole 29.
A plurality of fluorescent tube 23A, 23B, 23C and 23D are cold cathode fluorescent lamp or other controlled luminous monomer.Yet fluorescent tube quantity included in the module 2 backlight is not limited thereto, and the quantity of fluorescent tube and arrangement mode can be decided on demand.
Quantity that this blooming piece 25 is set and the visual processing procedure of order or customer demand give additions and deletions or adjustment.
Described light sensing apparatus should be made corresponding setting according to the quantity and the arrangement mode of fluorescent tube, at this, light sensing apparatus 20A, 20B, 20C, 20D also can be arranged at any position that senses corresponding fluorescent tube 23A, 23B, 23C and 23D brightness, and do not influence the output of fluorescent tube light.
Described light sensing apparatus comprise a light sensitive diode (Photo Diode), a charge-coupled image sensor (Charge Couple Device, CCD), a photistor or a photoresistance.
Seeing also Fig. 5, is the present invention's module 2 first embodiment function connection layout backlight.The present invention's module 2 backlight includes a comparison operation device 30 in addition, and a plurality of drivings loop 32A, 32B, 32C and 32D, and is shinny in order to drive corresponding fluorescent tube 23A, 23B, 23C and 23D.Comparison operation device 30 produces the pipe output current that a feedback signal is adjusted corresponding driving loop 32A, 32B, 32C and 32D according to the detected electric signal of light sensing apparatus 20A, 20B, 20C and 20D.
When driving loop 32A, 32B, 32C and 32D be output current or voltage respectively, drive corresponding fluorescent tube 23A, 23B, when 23C and 23D are shinny, light sensing apparatus 20A, 20B, 20C and 20D be sensing fluorescent tube 23A respectively, 23B, the brightness of the actual generation of 23C and 23D, and produce a signal respectively and deliver to comparison operation device 30, after this signal and default mean value are compared, comparison operation device 30 can produce a feedback signal, comparison operation device 30 again with light sensing apparatus 20A, 20B, the corresponding feedback signal of 20C and 20D is sent to respectively and drives loop 32A, 32B, 32C and 32D, drive loop 32A to adjust respectively, 32B, the curtage that 32C and 32D exported, so that fluorescent tube 23A, 23B, the brightness of 23C and 23D is consistent with the pairing brightness of default mean value, and then improves the homogeneity of lamplight brightness.
Module 2 backlight further comprises a warning device 34, the pairing signal of brightness that senses any fluorescent tube among corresponding fluorescent tube 23A, 23B, 23C and the 23D as light sensing apparatus 20A, 20B, 20C and 20D is lower than this default mean value, and during this signal certain time, comparison operation device 30 will be exported a shutdown signal, make the driving loop 32A, 32B, 32C and the 32D that are connected with this fluorescent tube 23A, 23B, 23C and 23D close this fluorescent tube, this warning device gives the alarm simultaneously.
The alarm that this warning device 34 is sent is a sound, and flash of light or image show.
The installation site of this warning device 34 and the visual actual needs setting of the time that signal continued that is lower than this default mean value.
Seeing also Fig. 6, is the second embodiment function connection layout of the present invention's module 3 backlight.This module 3 backlight is basic identical with the structure and the function of module 2 backlight, difference is: light sensing apparatus 20A, 20B, 20C and 20D be the brightness of the actual generation of sensing fluorescent tube 23A, 23B, 23C and 23D respectively, and produce a signal respectively and deliver to signal amplifying apparatus 58A, 58B, 58C and 58D earlier, deliver to comparison operation device 30 again.Utilize the purpose of signal amplifying apparatus 58A, 58B, 58C and 58D to be, to amplify with the corresponding signal of brightness of the actual generation of fluorescent tube 23A, 23B, 23C and 23D, what be convenient to that 30 pairs of these signals of comparison operation device and default mean value compare is more accurate.
Above-described default mean value is the pairing curtage value of the brightness of standard fluorescent tube under the situation of operate as normal, default mean value can be according to actual needs or customer demand set.
In addition, those skilled in the art also can do other variation in spirit of the present invention.So the variation that these are done according to spirit of the present invention all should be included within the present invention's scope required for protection.
Claims (10)
1. a module backlight is characterized in that comprising: a housing; One light guide plate is arranged in this housing; A plurality of fluorescent tubes are arranged in this light guide plate; A plurality of drivings loop, its respectively with the corresponding connection of these a plurality of fluorescent tubes, in order to drive to connect fluorescent tube shinny; A plurality of light sensing apparatus, it is corresponding with these a plurality of fluorescent tubes respectively, in order to sensing the brightness of corresponding fluorescent tube; An and comparison operation device, wherein, when the fluorescent tube that the output current driving of driving loop is connected is shinny, the brightness of light sensing apparatus sensing this fluorescent tube corresponding with this fluorescent tube also produces a signal and delivers to this comparison operation device, the comparison operation device compares a plurality of signals of a plurality of fluorescent tubes with the default mean value of a corresponding brightness value, this comparison operation device can produce a plurality of feedback signals and be sent to pairing driving loop, corresponding lamp tube current is adjusted in a plurality of drivings loop more respectively, makes that the brightness of a plurality of fluorescent tubes is consistent with this default pairing brightness value of mean value.
2. module backlight according to claim 1 is characterized in that: it further comprises a reflector plate, and it is arranged between this housing and the light guide plate.
3. module backlight according to claim 1 is characterized in that: described light sensing apparatus be arranged at can the position of direct sensing lighting tube brightness corresponding with it on.
4. module backlight according to claim 1 is characterized in that: the below of described a plurality of fluorescent tubes respectively is provided with a through hole that runs through housing.
5. module backlight according to claim 4 is characterized in that: it is outer and relative with this through hole that described light sensing apparatus is arranged at this housing.
6. module backlight according to claim 1, it is characterized in that: it further comprises a warning device, when the signal of corresponding lighting tube brightness that light sensing apparatus senses is lower than this default mean value, and during this signal certain time, the comparison operation device will be exported a shutdown signal, make the driving loop that is connected with this fluorescent tube close this fluorescent tube, this warning device gives the alarm simultaneously.
7. module backlight according to claim 6 is characterized in that: the alarm that described warning device sent is a sound, and flash of light or image show.
8. module backlight according to claim 1 is characterized in that: it further comprises a signal amplifying apparatus, and it is used for the corresponding signal of the brightness of the actual generation of fluorescent tube is amplified earlier, is resent to the comparison operation device.
9. module backlight according to claim 1 is characterized in that: described light sensing apparatus comprises a light sensitive diode, a charge-coupled image sensor, a photistor or a photoresistance.
10. module backlight according to claim 1 is characterized in that: described fluorescent tube is a cold cathode fluorescent lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101012187A CN100529881C (en) | 2005-11-12 | 2005-11-12 | Backlight assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101012187A CN100529881C (en) | 2005-11-12 | 2005-11-12 | Backlight assembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1963627A true CN1963627A (en) | 2007-05-16 |
| CN100529881C CN100529881C (en) | 2009-08-19 |
Family
ID=38082742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101012187A Expired - Fee Related CN100529881C (en) | 2005-11-12 | 2005-11-12 | Backlight assembly |
Country Status (1)
| Country | Link |
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| CN (1) | CN100529881C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937653A (en) * | 2010-09-27 | 2011-01-05 | 彩虹集团公司 | Method for adjusting subregion brightness consistency |
| CN107705758A (en) * | 2017-10-26 | 2018-02-16 | 惠科股份有限公司 | Display system and current driving method |
| CN110220673A (en) * | 2018-03-02 | 2019-09-10 | 谱钜科技股份有限公司 | The light source of spectrometer measures monitoring method and its system |
| US10524646B2 (en) | 2014-10-10 | 2020-01-07 | Olympus Corporation | Light source apparatus |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000294026A (en) * | 1999-04-09 | 2000-10-20 | Matsushita Electric Ind Co Ltd | Backlight device |
| JP2002149135A (en) * | 2000-11-13 | 2002-05-24 | Advanced Display Inc | Transmission type image display device, and device and method for adjustment |
| JP2004152720A (en) * | 2002-11-01 | 2004-05-27 | Optoquest Co Ltd | Planar light source |
| JP2004253354A (en) * | 2002-12-27 | 2004-09-09 | Nissen Chemitec Corp | Surface type lighting device |
| JP4044009B2 (en) * | 2003-07-04 | 2008-02-06 | アルゼ株式会社 | Mahjong game machine and control program for game machine |
| JP2004127928A (en) * | 2003-07-17 | 2004-04-22 | Masanori Aizawa | Backlight device for liquid crystal display |
| JP3813144B2 (en) * | 2003-09-12 | 2006-08-23 | ローム株式会社 | Light emission control circuit |
-
2005
- 2005-11-12 CN CNB2005101012187A patent/CN100529881C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101937653A (en) * | 2010-09-27 | 2011-01-05 | 彩虹集团公司 | Method for adjusting subregion brightness consistency |
| US10524646B2 (en) | 2014-10-10 | 2020-01-07 | Olympus Corporation | Light source apparatus |
| CN107705758A (en) * | 2017-10-26 | 2018-02-16 | 惠科股份有限公司 | Display system and current driving method |
| CN110220673A (en) * | 2018-03-02 | 2019-09-10 | 谱钜科技股份有限公司 | The light source of spectrometer measures monitoring method and its system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100529881C (en) | 2009-08-19 |
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Granted publication date: 20090819 Termination date: 20131112 |