CN1609662A - Back light source apparatus - Google Patents
Back light source apparatus Download PDFInfo
- Publication number
- CN1609662A CN1609662A CNA2004100877221A CN200410087722A CN1609662A CN 1609662 A CN1609662 A CN 1609662A CN A2004100877221 A CNA2004100877221 A CN A2004100877221A CN 200410087722 A CN200410087722 A CN 200410087722A CN 1609662 A CN1609662 A CN 1609662A
- Authority
- CN
- China
- Prior art keywords
- light
- glass substrate
- light source
- diffusing panel
- backlight arrangement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
Abstract
Provided is a backlight unit in which occurrence of luminance unevenness and chromaticity unevenness in the liquid crystal display can be prevented. The backlight unit 1 comprises a diffusion plate 10 which is composed of a glass substrate 2 of soda-lime glass and an optical film 4 having optical diffusion function that is pasted on the front surface, a light source 3 of a cold cathode tube or the like which is provided a plurality of pieces so as to be opposed to the diffusion plate 10, power supply parts 5 which are respectively provided at the rear side and at both ends of the backlight unit 1 and supply power to the light source 3, and a reflecting plate 7 which is provided between the light source 3 and the power supply part 5 and reflects the light from the light source 3. Here, a liquid crystal display panel 8 is arranged with a prescribed interval with the diffusion plate 10.
Description
Technical field
The present invention relates to a kind of backlight arrangement, relate in particular to the display panels backlight arrangement.
Background technology
Display panels is as display device such as monitor such as portable phone, portable information terminal, televisor, personal computers.
A kind of as the backlight arrangement that light is provided to display panels has side light type backlight source apparatus shown in Figure 5.
As shown in Figure 5, side light type backlight source apparatus 51 comprises: the light guide plate 52 of the rectangle that is made of allyl resin etc., linear light sources such as a plurality of fluorescent lights 53 in the arranged outside of two end face 52a, 52b of light guide plate 52, the blooming with light diffusion function 54 that adheres at the front surface of light guide plate 52, the power supply unit 55 that is provided with in the rear side of side light type backlight source apparatus 51, and be arranged on light source 53 around, reflection is from the reflection of light plate 57 of light source 53.Because blooming 54 has the light scattering function, so uniform light A can be provided to the display panels 58 of superposed configuration on blooming 54.Thus, prevented from display panels 58, to produce demonstration uneven (for example, with reference to Japanese kokai publication hei 8-315619 communique).
Side light type backlight source apparatus 51 with said structure is because light source 53 is arranged on the both ends of the surface 52a of light guide plate 52, the outside of 52b, so though have the advantage that can make the thickness attenuation, the low shortcoming of brightness is arranged also.Therefore, can not be applicable to that picture dimension is big and require the LCD TV (LCD-TV) of high brightness.
Therefore, picture dimension is big and require the LCD TV of high brightness to use direct-type backlight source apparatus shown in Figure 6.
As shown in Figure 6, direct-type backlight source apparatus 61 comprises: the diffusing panel 60 that is made of allyl resin substrate 62 and the blooming with function of optical diffusion 64 that adheres at its front surface, for obtaining the light sources such as a plurality of cold-cathode tubes 63 that high brightness and diffusing panel 60 relatively are provided with, the power supply unit 65 that is provided with respectively at the rear side and the both ends of direct-type backlight source apparatus 61, and be provided with in the rear side of light source 63, reflection is from the reflection of light plate 67 of light source 63.Here, display panels 68 superposed configuration (for example, with reference to TOHKEMY 2002-1882208 communique) on blooming 64.
But, as mentioned above, owing on direct-type backlight source apparatus 61, be provided with a plurality of light sources 63, therefore during the bright lamp of these light sources 63, the temperature of allyl resin substrate 62 is elevated to about 85 ℃, because of emit the thermal expansion of moisture content and allyl resin substrate 62 from the allyl resin substrate 62 (Fig. 7 (a)) of moisture absorption, diffusing panel 60 has produced warpage (Fig. 7 (b) and Fig. 7 (c)).Therefore, as shown in Figure 7, need predetermined interval (gap) be set between diffusing panel 60 and display panels 68, direct-type backlight source apparatus 61 is arranged, that is, used direct-type backlight source apparatus 61 LCD TV the thickness thickening problem.
In addition, also have the variable in distance of 68 of diffusing panel 60 that the warpage because of diffusing panel 60 causes and display panels, and produce the problem of brightness disproportionation.The picture dimension of display panels 68 is big more, and this problem is remarkable more.
Therefore in addition,, in diffusing panel 60, carry out heating repeatedly, the certain warpage of on diffusing panel 60 generation and the problem of distortion are arranged from certain orientation because of light source 63 bright lamps.
In addition, because of the ultraviolet ray of light source 63 emission, and there have allyl resin substrate 62 in the diffusing panel 60 to take place to be rotten, in time the problem that changes through tone (colourity) colouring, that be display panels 68 simultaneously.
Summary of the invention
The purpose of this invention is to provide a kind of backlight arrangement that can prevent from liquid crystal display, to produce brightness disproportionation and colourity inequality.
For achieving the above object, backlight arrangement of the present invention comprises the light source that sends light, and makes described light diffusing diffusing panel, and it is characterized in that: described diffusing panel comprises glass substrate.
Among the present invention, be preferably in the surface of described glass substrate, adhere to blooming with function of optical diffusion.
Among the present invention, the surface of best described glass substrate is a concaveconvex shape.
Among the present invention, best described glass substrate has been implemented blasting treatment.
Among the present invention, the full light transmittance of best described glass substrate is 63%～73%, and the diffused light transmissivity is 57%～67%, and fuzzy rate is 86%～96%, and full light reflectance is 15%～25%.
According to backlight arrangement of the present invention, because diffusing panel is made of glass substrate, thus the anti-hydroscopicity and the ultra-violet resistance of diffusing panel can be improved, and can reduce the thermal expansion of diffusing panel, therefore, can prevent from liquid crystal display, to produce brightness disproportionation and colourity inequality.
Best, on the surface of glass substrate, adhere to blooming, so uniform light can be provided with function of optical diffusion.
Best, the surface of glass substrate is a concaveconvex shape, so also can not provide uniform light even do not adhere to blooming.
Best, described glass substrate has been implemented blasting treatment, so can easily make the surface of glass substrate form concaveconvex shape.
Best, the full light transmittance of glass substrate is 63%～73%, and the scattered light transmissivity is 57%～67%, and fuzzy rate is 86%～96%, and full light reflectance is 15%～25%, so uniform light can be provided reliably.
Description of drawings
Fig. 1 is the sectional view of the backlight arrangement of embodiment of the present invention;
Fig. 2 is the curve of relation of the warpage shift amount of working time of backlight arrangement of presentation graphs 1 and diffusing panel;
Fig. 3 is the curve of the relation of working time of backlight arrangement of presentation graphs 1 and colourity (Y value);
Fig. 4 is the figure that uses for the colourity variation measuring method that diffusing panel is described;
Fig. 5 is the sectional view of existing side light type backlight source apparatus;
Fig. 6 is the sectional view of existing direct-type backlight source apparatus;
Fig. 7 is the sectional view of existing direct-type backlight source apparatus, when (a) expression is not worked, and when (b) representing initialization, each state after (c) expression works long hours.
Embodiment
What the inventor studied for achieving the above object and with keen determination found that, have the light source that sends light and making in the backlight arrangement of light diffusing diffusing panel, when diffusing panel is made of glass substrate, can improve the anti-hydroscopicity and the ultra-violet resistance of diffusing panel, and, the thermal expansion of diffusing panel can be reduced, therefore, brightness disproportionation and colourity inequality can be prevented to take place in the liquid crystal display.
In addition, when the inventor has also found in the surface adhesion of glass substrate to have the blooming of function of optical diffusion, can provide uniform light.
In addition, when the inventor finds that also the surface of glass substrate is concaveconvex shape,, also can provide uniform light even do not adhere to blooming.
In addition, after the inventor finds that also glass substrate has been implemented blasting treatment, can easily make the surface of glass substrate form concaveconvex shape.
In addition, the inventor also finds, the full light transmittance of glass substrate is 63%～73%, the scattered light transmissivity is 57%～67%, fuzzy (haze) rate is 86%～96%, full light reflectance is 15%～25% o'clock, and uniform light can be provided reliably.
The present invention makes according to above-mentioned result of study.
Below, with reference to accompanying drawing, describe the backlight arrangement of embodiment of the present invention in detail.
Fig. 1 is the sectional view of the backlight arrangement of embodiment of the present invention.
Among Fig. 1, the backlight arrangement 1 of embodiment of the present invention comprises: the diffusing panel 10 that glass substrate of being made by soda-lime glass 2 and the blooming with function of optical diffusion 4 that adheres at its front surface constitute, relatively be provided with light sources 3 such as a plurality of cold-cathode tubes with diffusing panel 10, be separately positioned on the rear side of backlight arrangement 1 and both ends, to the power supply unit 5 of light source 3 supply capabilities, and between light source 3 and power supply unit 5, be provided with, reflection is from the reflection of light plate 7 of light source 3.Here, display panels 8 is configured at a distance of predetermined space with diffusing panel 10.
According to the embodiment of the present invention, because diffusing panel is made of the glass substrate 2 of soda-lime glass, so can improve the anti-hydroscopicity and the ultra-violet resistance of diffusing panel 10, and, can reduce thermal expansion, therefore, can prevent to produce the brightness disproportionation and the colourity inequality of liquid crystal display, in addition, because glass substrate 2 is inorganicss, absorbs electromagnetic wave (EMI) function, prevent reflection (AR) function and prevent function such as charged (TEC) function so can add easily.
According to the embodiment of the present invention, owing to adhered to blooming 4 with function of optical diffusion at the front surface of glass substrate 2, so can provide uniform light to display panels 8.
In embodiments of the present invention, though for display panels 8 is provided light and used backlight arrangement 1, its purposes is not limited to this.
In embodiments of the present invention, adhere to blooming 4 by front surface with function of optical diffusion at glass substrate 2, and make diffusing panel 10 have function of optical diffusion, but, also can make the surface of glass substrate 2 form concaveconvex shape, and make diffusing panel 10 have function of optical diffusion by blasting treatment etc.Here, the surface of glass substrate 2 is being carried out under the situation of blasting treatment, the full light transmittance of glass substrate 2 is 63%～73%, the scattered light transmissivity is 57%～67%, fuzzy rate is 86%～96%, full light reflectance is 15%～25%, can provide uniform light to display panels 8.
In embodiments of the present invention, used soda-lime glass, but be not limited to this, for example, also can use alkali-free glass substrate as glass substrate 2.
[embodiment]
Below, embodiments of the invention are described.
The inventor made use thickness of slab as the soda-lime glass substrate of 1.8mm as glass substrate, used a plurality of cold-cathode tubes of relatively being provided with about 30mm pitch with glass substrate backlight (embodiment 1) as light source, do not adhere to the optical scattering film and make it to form the backlight (embodiment 2) of concaveconvex shape, use and adhered to the backlight (comparative example 1) of the allyl resin substrate of optical scattering film as diffusing panel at front surface by the surface of soda-lime glass substrate being carried out blasting treatment at the front surface of the soda-lime glass substrate of thickness of slab 1.8mm.
Fig. 2 is the curve of relation of the warpage shift amount of working time of backlight arrangement of presentation graphs 1 and diffusing panel.
Among Fig. 2, the longitudinal axis is represented the warpage shift amount (mm) of diffusing panel, and transverse axis is represented the working time (h) of bias light.Here, the warpage shift amount is timing, and expression is to the light source side warpage, and when shift amount was negative, expression was to display panels side warpage.
In addition, dotted line is represented embodiment 1, realizes expression comparative example 1.
From the result of Fig. 2 as can be seen, (comparative example 1 when diffusing panel is made of the allyl resin substrate, Fig. 6), be under 0～250 hour the situation in the working time of backlight arrangement, diffusing panel thermal expansion and to light source side warpage (Fig. 7 (b)), during about 250 hours of working time, diffusing panel is also big because of the shrinkage ratio thermal expansion of emitting the moisture content generation, warp direction sharply changes to the display panels side from light source side, working time is under 250～500 hours the situation, diffusing panel is dry to be shunk to display panels side warpage (Fig. 7 (c)), in contrast, when diffusing panel is made of soda-lime glass (embodiment 1), diffusing panel is warpage hardly.
Fig. 3 is the curve of the relation of working time of backlight arrangement of presentation graphs 1 and colourity (Y-axis).
Among Fig. 3, the longitudinal axis is represented colourity (Y-axis), and transverse axis is represented the working time (h) of backlight.
In addition, zero expression embodiment 1, * expression comparative example 1.
The data of Fig. 3 are by will be as the allyl resin substrate of sample substrate and soda-lime glass substrate adjustment to 80 ℃, as shown in Figure 4, carry out obtaining by the colourity measure of the change that sensor is measured the colourity of sending, see through the light of sample substrate from light source.
From the result of Fig. 3 as can be seen, when diffusing panel is made of the allyl resin substrate (comparative example 1), along with the working time of backlight arrangement is elongated, colourity (Y value) linearly increases, relative therewith, when diffusing panel is made of the soda-lime glass substrate (embodiment 1), colourity (Y value) changes hardly.
In addition, can determine under the situation of the surface of soda-lime glass substrate having been carried out blasting treatment (embodiment 2), the full light transmittance of soda-lime glass becomes 68.1%, the scattered light transmissivity becomes 62.1%, fuzzy rate becomes 92.1%, full light reflectance becomes 19.9%, thereby can provide uniform light to liquid crystal display substrate.
Claims (5)
1. a backlight arrangement comprises the light source that sends light and makes described light diffusing diffusing panel, and it is characterized in that: described diffusing panel comprises glass substrate.
2. backlight arrangement according to claim 1 is characterized in that: on the surface of described glass substrate, adhere to the blooming with function of optical diffusion.
3. backlight arrangement according to claim 1 is characterized in that: the surface of described glass substrate is a concaveconvex shape.
4. backlight arrangement according to claim 3 is characterized in that: described glass substrate has been implemented blasting treatment.
5. backlight arrangement according to claim 4 is characterized in that: the full light transmittance of described glass substrate is 63%～73%, and the diffused light transmissivity is 57%～67%, and fuzzy rate is 86%～96%, and full light reflectance is 15%～25%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP363288/2003 | 2003-10-23 | ||
| JP2003363288A JP2005129346A (en) | 2003-10-23 | 2003-10-23 | Backlight unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1609662A true CN1609662A (en) | 2005-04-27 |
Family
ID=34642661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2004100877221A Pending CN1609662A (en) | 2003-10-23 | 2004-10-22 | Back light source apparatus |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2005129346A (en) |
| KR (1) | KR20050039648A (en) |
| CN (1) | CN1609662A (en) |
| TW (1) | TW200528869A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437153C (en) * | 2006-05-25 | 2008-11-26 | 友达光电股份有限公司 | Backlight module and diffusion module therefor |
| CN107002980A (en) * | 2014-05-15 | 2017-08-01 | 罗茵尼公司 | The light diffusion of light generating source |
| CN108267890A (en) * | 2016-12-30 | 2018-07-10 | 乐金显示有限公司 | Include the liquid crystal display of glass diffuser plate |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4522935B2 (en) * | 2005-09-30 | 2010-08-11 | 株式会社 日立ディスプレイズ | Backlight illumination device and image display device |
| JP6964447B2 (en) | 2017-06-29 | 2021-11-10 | パナソニック液晶ディスプレイ株式会社 | Display device |
-
2003
- 2003-10-23 JP JP2003363288A patent/JP2005129346A/en not_active Withdrawn
-
2004
- 2004-10-22 CN CNA2004100877221A patent/CN1609662A/en active Pending
- 2004-10-22 KR KR1020040084830A patent/KR20050039648A/en not_active Application Discontinuation
- 2004-10-22 TW TW093132091A patent/TW200528869A/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100437153C (en) * | 2006-05-25 | 2008-11-26 | 友达光电股份有限公司 | Backlight module and diffusion module therefor |
| CN107002980A (en) * | 2014-05-15 | 2017-08-01 | 罗茵尼公司 | The light diffusion of light generating source |
| CN107002980B (en) * | 2014-05-15 | 2020-07-17 | 罗茵尼公司 | Light diffusion of light generating sources |
| CN108267890A (en) * | 2016-12-30 | 2018-07-10 | 乐金显示有限公司 | Include the liquid crystal display of glass diffuser plate |
| US10989951B2 (en) | 2016-12-30 | 2021-04-27 | Lg Display Co., Ltd. | Liquid crystal display including glass diffuser plate |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200528869A (en) | 2005-09-01 |
| JP2005129346A (en) | 2005-05-19 |
| KR20050039648A (en) | 2005-04-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |