CN1288481C - Backlight subassembly - Google Patents
Backlight subassembly Download PDFInfo
- Publication number
- CN1288481C CN1288481C CN 200310118075 CN200310118075A CN1288481C CN 1288481 C CN1288481 C CN 1288481C CN 200310118075 CN200310118075 CN 200310118075 CN 200310118075 A CN200310118075 A CN 200310118075A CN 1288481 C CN1288481 C CN 1288481C
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- Prior art keywords
- fluorescent tube
- backlight assembly
- low
- light level
- display panel
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- Expired - Lifetime
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- 238000009792 diffusion process Methods 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 8
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010010 raising Methods 0.000 description 1
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Abstract
The present invention relates to a back light assembly which is arranged behind a display panel. The back light assembly comprises a reflecting plate, a diffuser plate which is arranged between the reflecting plate and the display panel, a plurality of first lamp tubes and second lamp tubes are arranged between the reflecting plate and the diffuser plate, wherein each the first lamp tube is provided with two first low-light level zones which are respectively arranged on both ends of the first lamp tube, each the second lamp tube is provided with two second low-light level zones which are respectively arranged on both ends of the second lamp tube, the first low-light level zones at the right end of the first lamp tubes are partially overlapped with the second low-light level zones at the left end of the second low-light level zones.
Description
Technical field
The invention provides a kind of backlight assembly (back lightunit) that is applied to a display panel (display panel), refer to a kind of backlight assembly that is applied to a large scale display panel especially.
Background technology
Backlight assembly is one of key part and component of lcd products, has been widely used at present on digital camera, personal digital assistant (PDA), satellite navigation system, computer monitor and the flat-surface television.Generally speaking, backlight assembly all is located at the below of a display panel (display panel), and have a light source and a diffuser plate (diffusing plate), to provide a homodisperse light, form suitable image by the pixel electrode on the control display panel again to this display panel.Wherein, backlight assembly can be according to the position of light source, is divided into light source and produces from the direct type backlight assembly under the display panel or light source near the side-light type the display panel side (edge light) backlight assembly.And since direct type backlight assembly with light source generator be located at display panel under, therefore can be applicable to the display panel of higher brightness demand or large-size, for example computer monitor and flat television etc.
With reference to figure 1, Fig. 1 is the diagrammatic cross-section of a known backlit assembly 10.As shown in Figure 1, backlight assembly 10 is located at the below of a display panel 12, and comprise that many tubes 14, are located at the diffuser plate (diffusing plate) 16 between fluorescent tube 14 and the display panel 12, and one is located at fluorescent tube 14 belows and is fixed in reflecting plate (reflecting sheet) 18 on the housing 20.Wherein, fluorescent tube 14 is used to provide a light source to display panel 12, the light that reflecting plate 18 is used for fluorescent tube 14 is produced upwards reflects, to increase the utilization rate of light, and then a preferable brightness output is provided, diffuser plate 16 can be with the further scattering of light by diffuser plate 16, to provide display panel 12 more homodisperse light, and be located at reflecting plate 18 belows and coat reflecting plate 18 housing 20 on every side, then be to be used for fixing diffuser plate 16, reflecting plate 18 and fluorescent tube 14.In addition; a general diffusion sheet 22 and the blooming piece 24 of above diffuser plate 16, also being provided with usually; difference with further correction irradiation intensity; the light that display panel 12 is received can have uniform irradiation intensity distributions; wherein, diffusion sheet 22 and blooming piece 24 set quantity and the visual demands of order are changed.
With reference to figure 2, Fig. 2 is the fluorescent tube configuration schematic diagram in the backlight assembly 10, and as shown in Figure 2, fluorescent tube 14 is grown direction on one side in display panel 12, in the mode that is arranged in parallel, be installed between reflecting plate 18 and the diffuser plate 16.Yet along with continually developing of large scale display panel, the also corresponding increase of needed fluorescent tube length.And when the length of fluorescent tube 14 increased, required trigger voltage and light tube electric voltage also can be along with raisings.For instance, when fluorescent tube 14 length surpass 75 centimeters, the trigger voltage of fluorescent tube 14 can surpass 2000Vrms and light tube electric voltage also can surpass 1000Vrms, and this will cause serious puzzlement to the design of reverser, and this also is that the size of known display panel 12 is mostly less than 40 o'clock main cause.
With reference to figure 3, Fig. 3 is the fluorescent tube configuration schematic diagram of another known backlit assembly 50.As shown in Figure 3, fluorescent tube 54 is arranged than short direction on one side in display panel.Under this fluorescent tube configuration mode, though can promote the size of display panel a little, but show in upright mode because general large-sized display panel is many, therefore, under this kind configuration, each fluorescent tube 54 all carries out luminous demonstration in upright mode, under the effect of thermal convection, the temperature of each fluorescent tube 54 upper end all can be come highly than the temperature of lower end, this temperature degree difference will cause the density unevenness of each fluorescent tube 54 inner mercury vapor, and the light that causes fluorescent tube 54 two ends to send has different colors and brightness, has a strong impact on display quality.
Therefore will how to change the design of backlight assembly, can meet the demand of large scale display panel with it, real is current important topic.
Summary of the invention
Therefore, the objective of the invention is to, to solve the known backlit component application in the problem that large-sized display panel was taken place for a kind of backlight assembly that is applicable to the large scale display panel.
In a preferred embodiment of the invention, one backlight assembly is located at the rear of a display panel, to provide light source to this display panel, this backlight assembly comprises: a reflecting plate, one is located at the diffuser plate between this reflecting plate and this display panel, many first fluorescent tube and many second fluorescent tubes that are installed between this reflecting plate and this diffuser plate, described each first fluorescent tube has the two first low-light level districts that lay respectively at the two ends, the left and right sides of described first fluorescent tube, described each second fluorescent tube also has two and lays respectively at the described respectively second low-light level district at the two ends, the left and right sides of second fluorescent tube, and wherein this second low-light level district part of this first low-light level district of this first fluorescent tube right-hand member and this second fluorescent tube left end coincides.
Because backlight assembly of the present invention changes the configuration of tube mode, improve the size of backlight assembly by the staggered fluorescent tube of multiple row, to provide a large scale display panel one stable and light source uniformly.
Description of drawings
Fig. 1 is the diagrammatic cross-section of known backlit assembly.
Fig. 2 is the fluorescent tube configuration mode synoptic diagram in the known backlit assembly.
Fig. 3 is the fluorescent tube configuration mode synoptic diagram in another known backlit assembly.。
Fig. 4 is backlight assembly diagrammatic cross-section among the present invention.
Fig. 5 is the fluorescent tube configuration mode synoptic diagram in the backlight assembly of the present invention.
Fig. 6 is the graph of a relation of position and brightness in the fluorescent tube.
Fig. 7 is the local enlarged diagram of Fig. 5.
The reference numeral explanation:
10 backlight assemblies, 12 display panels
14 fluorescent tubes, 16 diffuser plates
18 reflecting plates, 20 housings
22 diffusion sheets, 24 optics matrixs
54 fluorescent tubes, 58 reflecting plates
110 backlight assemblies, 112 display panels
114 first fluorescent tubes, 115 second fluorescent tubes
The normal luminous zone of 114a, the 114a first low-light level district
The normal luminous zone of 115a, the 115a second low-light level district
116 diffuser plates, 18 reflecting plates
120 housings, 122 optics matrixs
124 optics matrixs, 130 tube stands
Embodiment
With reference to figure 4, Fig. 4 is the diagrammatic cross-section of backlight assembly 110 among the present invention.As shown in Figure 4, backlight assembly 110 is located at the below of a display panel 112, and comprises: a reflecting plate 118, is at the diffuser plate 122 between reflecting plate 118 and the Display Panel 112, many first fluorescent tube 114 and second fluorescent tubes of being located between diffuser plate 116 and the reflecting plate 118 115.It should be noted that, diagrammatic cross-section among Fig. 4 for convenience of description for the purpose of and backlight assembly 110 is located at the below of display panel 112, yet when practical application, display panel more than 112 uses in upright mode, in other words, in fact backlight assembly 110 is located at the rear of Display Panel 112.
Wherein first fluorescent tube 114 and second fluorescent tube 115 are used to provide a light source to display panel 112, reflecting plate 118 is used for upwards reflection of light that first fluorescent tube 114 and second fluorescent tube 115 are produced, to increase the utilization rate of light, and then provide a preferable brightness to export, diffuser plate 116 can be with the further scattering of light by diffuser plate 116, to provide display panel 112 more homodisperse light.Generally speaking, backlight assembly 110 comprises also that usually a housing 120 is located at reflecting plate 18 belows and coats around the reflecting plate 118, is used for fixing diffuser plate 116, reflecting plate 118, first fluorescent tube 114 and second fluorescent tube 115.It should be noted that 112 of diffuser plate 116 and display panels also are provided with at least one blooming piece usually; for example a prismatic lens or a diffusion sheet; with the difference of further correction irradiation intensity, the light that display panel 112 is received can have uniform irradiation intensity distributions.In a preferred embodiment of the invention, backlight assembly 110 comprises that a diffusion sheet 122 and a prismatic lens 124 are stacked on the diffuser plate 116 in regular turn, yet the present invention but is not limited thereto, diffusion sheet 122 and the prismatic lens 124 set quantity and the visual demands that put in order are changed, so that a light source output uniformly to be provided.In addition, diffuser plate 116 surfaces can comprise that also one destroys the figure of light total reflection, and this figure comprises printing points, and non-printing dots and groove further to make the light scatter by diffuser plate 116, increase the uniformity coefficient of institute's output light source.
With reference to figure 5, Fig. 5 is the fluorescent tube configuration schematic diagram of backlight assembly 110.As shown in Figure 5, many first fluorescent tubes 114 and second fluorescent tube 115 all are arranged in parallel, and are installed between reflecting plate 118 and the diffuser plate 116 in the mode of horizontal arrangement, to avoid taking place to influence because of the thermal convection effect quality of light source output.In a preferred embodiment of the invention, backlight assembly 110 also comprises the tube stand of being located on the reflecting plate 118 towards the one side of display panel 112 130, have a plurality of on the tube stand 130 and the corresponding groove of lamp tube shapes, with the right-hand member that is used for fixing first fluorescent tube 114 and the left end of second fluorescent tube 115, first fluorescent tube 114 and second fluorescent tube 115 are disposed between reflecting plate 118 and the diffuser plate 116, so that a light output uniformly to be provided in staggered mode.In addition, can also be provided with a power supply line in the tube stand 130, so that one first voltage to the first fluorescent tube 114 and second fluorescent tube 115 to be provided.
Because the present invention utilizes first fluorescent tube 114 and second fluorescent tube about 115 to be staggered, and since first fluorescent tube 114 and second fluorescent tube 115 employed all be the line style fluorescent tube, its two ends, left and right sides all can have the low brightness area that a length is L (as shown in Figure 6), therefore, first fluorescent tube 114 and 115 of second fluorescent tubes must need the situation that suitable coinciding can be avoided near the tube stand 130 light luminance inequalities that produce.
With reference to figure 7, Fig. 7 is the partial enlarged drawing of Fig. 5.As Fig. 5 and shown in Figure 7, first fluorescent tube 114 comprises that the two first low-light level district 114a and that are positioned at two ends, the left and right sides are positioned at the normal luminous zone 114b in first fluorescent tube, 114 stage casings, and second fluorescent tube 115 comprises that the two second low-light level district 115a and that are positioned at two ends, the left and right sides are positioned at the normal luminous zone 115b in second fluorescent tube, 115 stage casings, and wherein the length of the first low-light level district 114a and the second low-light level district 115a is L1.First fluorescent tube 114 and 115 of second fluorescent tubes then have the zone that coincides, the length L 2 in this zone that coincides is greater than the length L 1 of the first low-light level district 114a or the second low-light level district 115a, the brightness unlikely low excessively (with respect to normal luminous zone 114b and the 115b in first fluorescent tube 114 and second fluorescent tube 115) in zone so that this coincides, and the first low-light level district 114a partly coincides in the second low-light level district 115a, the brightness in zone is unlikely too high so that this coincides, and can close brightness be arranged with normal luminous zone 114b and the 115b in first fluorescent tube 114 and second fluorescent tube 115, and provide a uniform light source to display panel 112.
Though utilize two row fluorescent tubes to be example in the foregoing description, illustrate that the present invention utilizes the fluorescent tube configuration mode to change the method for the size that increases backlight assembly, yet the present invention is not limited to this, and can carry out various forms of application according to aforesaid way, for example can dispose many 3rd fluorescent tubes again in the right side of second fluorescent tube 115, each the 3rd fluorescent tube has two the 3rd low-light level districts that lay respectively at its two ends, left and right sides, profit is staggered with second fluorescent tube 115 in the same way, and leave the zone that coincides of a suitable length, to form a backlight assembly with the design of three row fluorescent tubes.Should carry out the application of alternate manner easily according to above-mentioned diagram and explanation for those skilled in the art, have the backlight assembly that the multiple row fluorescent tube designs to form one.
Compare with known backlight assembly, backlight assembly of the present invention changes the design of single-row fluorescent tube in the known backlit assembly, and proposes a kind of backlight assembly with the design of multiple row fluorescent tube, so can make backlight assembly can be applied to the display panel of various big molded dimensions.In addition, the present invention also proposes the region design mode that coincides between a kind of multiple row fluorescent tube, make to have a suitable zone that coincides between each row fluorescent tube, with provide one stable and uniformly light source to display panel.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (10)
1. backlight assembly, this backlight assembly is located at the rear of a display panel, and this backlight assembly comprises:
One reflecting plate;
One is located at the diffuser plate between this reflecting plate and this display panel;
Many are installed in first fluorescent tube between this reflecting plate and this diffuser plate in the mode that is arranged in parallel, and described each first fluorescent tube has the two first low-light level districts that lay respectively at the two ends, the left and right sides of described each first fluorescent tube; And
Many are installed in second fluorescent tube between this reflecting plate and this diffuser plate in the mode that is arranged in parallel, and described each second fluorescent tube has the two second low-light level districts that lay respectively at the two ends, the left and right sides of each second fluorescent tube;
Wherein this second low-light level district part of this first low-light level district of this first fluorescent tube right-hand member and this second fluorescent tube left end coincides.
2. backlight assembly as claimed in claim 1 is characterized in that: this backlight assembly comprises that also one is arranged on this reflecting plate the tube stand towards the one side of display panel.
3. backlight assembly as claimed in claim 2 is characterized in that: this tube stand is used for fixing this first fluorescent tube and this second fluorescent tube, and provides one first voltage to the right-hand member of this first fluorescent tube and the left end of this second fluorescent tube.
4. backlight assembly as claimed in claim 1 is characterized in that: described many first fluorescent tubes and described many second fluorescent tubes are staggered.
5. backlight assembly as claimed in claim 1 is characterized in that: have the zone that coincides between this first fluorescent tube and this second fluorescent tube, and the length in this zone that coincides is greater than the length in this first low-light level district and the length in this second low-light level district.
6. backlight assembly as claimed in claim 1, it is characterized in that: this backlight assembly also comprises many 3rd fluorescent tubes that are installed between this reflecting plate and this diffuser plate, described each the 3rd fluorescent tube has two and lays respectively at respectively the 3rd low-light level district at the two ends, the left and right sides of the 3rd fluorescent tube, and the 3rd low-light level district part of this second low-light level district of this second fluorescent tube right-hand member and the 3rd fluorescent tube left end coincides.
7. backlight assembly as claimed in claim 1 is characterized in that: this backlight assembly also comprises the blooming piece of being located between this diffuser plate and this display panel.
8. backlight assembly as claimed in claim 7 is characterized in that: this blooming piece comprises an at least one prismatic lens and a diffusion sheet.
9. backlight assembly as claimed in claim 1 is characterized in that: this diffuser plate surface comprises that one destroys the figure of light total reflection.
10. backlight assembly as claimed in claim 9 is characterized in that: this figure comprises printing points, non-printing dots and groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310118075 CN1288481C (en) | 2003-11-20 | 2003-11-20 | Backlight subassembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310118075 CN1288481C (en) | 2003-11-20 | 2003-11-20 | Backlight subassembly |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1544982A CN1544982A (en) | 2004-11-10 |
| CN1288481C true CN1288481C (en) | 2006-12-06 |
Family
ID=34337985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310118075 Expired - Lifetime CN1288481C (en) | 2003-11-20 | 2003-11-20 | Backlight subassembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1288481C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100335954C (en) * | 2005-04-18 | 2007-09-05 | 友达光电股份有限公司 | Backlight module structure |
| WO2009057345A1 (en) * | 2007-10-30 | 2009-05-07 | Sharp Kabushiki Kaisha | Lamp holder, backlight unit, and display device |
-
2003
- 2003-11-20 CN CN 200310118075 patent/CN1288481C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CN1544982A (en) | 2004-11-10 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20061206 |