CN100381912C - Back light module for double side display - Google Patents
Back light module for double side display Download PDFInfo
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- CN100381912C CN100381912C CNB2004100698700A CN200410069870A CN100381912C CN 100381912 C CN100381912 C CN 100381912C CN B2004100698700 A CNB2004100698700 A CN B2004100698700A CN 200410069870 A CN200410069870 A CN 200410069870A CN 100381912 C CN100381912 C CN 100381912C
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- backlight assembly
- electrode
- light
- emitting device
- fluorescent lamp
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Abstract
The present invention relates to a backlight component for a double surface display, which comprises a plurality of outer electrode fluorescent tubes which are arranged between two liquid crystal display panels, wherein each of the outer electrode fluorescent tubes comprises a first electrode end and a second electrode end, and the first electrode ends are respectively and electrically connected with the second electrode ends in parallel.
Description
Technical field
The present invention relates to a kind of backlight assembly that is applied to display with double faces, particularly relate to a kind of backlight assembly with simplified structure.
Background technology
Along with lcd technology is showing improvement or progress day by day, display panels has been widely used on the consumption electronic products such as digital camera, personal digital assistant (PDA), mobile phone and thin plane TV.Wherein backlight assembly be LCD key part and component one, be located at the back side of a display panels, in order to provide display panels required light source.
Generally speaking, backlight assembly generally includes the many cathode fluorescent tubes that are arranged in parallel (CCFL), and cooperates the combination of various optical modules (as diffuser plate, prism etc.), so that display panels high brightness and uniform light source to be provided.Wherein cathode fluorescent tube needs voltage changer (inverter) to supply with High AC voltage, yet because voltage changer can't provide the required driving voltage of cathode fluorescent tube of many parallel connections simultaneously, otherwise the capacity of the stable electric capacity (ballast) in the voltage changer can be unstable, cause the cathode fluorescent tube brightness disproportionation, therefore each root cathode fluorescent tube need utilize independently lead to be electrically connected to different voltage changers respectively to drive basically, and this restriction causes the difficulty of casing design with the intraware configuration of LCD.For the themselves one-sided displays that only has single display panels, though the lead of above-mentioned each cathode fluorescent tube is numerous, yet because themselves one-sided displays only need provide the Presentation Function of single direction, therefore lead and voltage changer can be arranged at reflecting plate or the back of the body frame rear of backlight assembly with respect to the other direction of display panels, and are unlikely the lighting function that influences backlight assembly.
Yet along with the release of display with double faces, the lead problem of above-mentioned cathode fluorescent tube promptly can't solve easily and cause casing to design the difficulty that disposes with intraware.Display with double faces is made up of two parallel display panels, and utilization is arranged at the light source performance display effect that the backlight assembly between the display panels provides, therefore the backlight assembly that applies to display with double faces is necessary for open state in the face of two faces of display panels, and can't be provided with reflecting plate.The lead of cathode fluorescent tube just can't be hidden in the rear of reflecting plate in the case, and must design the position that lead is laid under the prerequisite of the lighting function that does not influence backlight assembly in addition.For instance, lead is laid in the position between the backlight assembly outside and the LCD casing usually, to avoid covering the light source that backlight assembly produces.But the space of above-mentioned position is limited, and just is provided with other necessary assembly of LCD originally, as the control circuit of display panels.Except that this,, difficulty and cost in the configuration of display with double faces intraware have therefore also been increased because each root cathode fluorescent tube needs independently voltage changer.
With reference to figure 1 and Fig. 2, Fig. 1 is known one vertical view that is applied to the backlight assembly 10 of display with double faces, and Fig. 2 is the diagrammatic cross-section of backlight assembly 10 shown in Figure 1.As Fig. 1 and shown in Figure 2, backlight assembly 10 is arranged between the two parallel display panels 20, in order to provide display panels 20 required light source.Backlight assembly 10 comprises a framework 12, and many cathode fluorescent tubes that are arranged in parallel 14, be fixed on the framework 12, and each root cathode fluorescent tube 14 comprises that all two expose to electrode 14A and the 14B outside the framework 12.In addition, backlight assembly 10 also comprises and cathode fluorescent tube 14 the same number of voltage changers 16, in order to convert DC voltage to High AC voltage, and each voltage changer 16 utilizes two power lead 16A and 16B to be electrically connected with 14B with two electrode 14A of corresponding cathode fluorescent tube 14 respectively, for the suitable driving voltage of cathode fluorescent tube 14 that should be corresponding.In addition, backlight assembly 10 generally includes two diffuser plates 18 and is arranged at respectively between cathode fluorescent tube 14 and two display panels 20, with the light source of scattering cathode fluorescent tube 14 emissions.
From the above, increase along with cathode fluorescent tube 14 numbers, known backlit assembly 10 must be provided with the voltage changer 16 of similar number so that suitable driving voltage to be provided, yet the increase of LCD cost is not only meaned in the increase of voltage changer 16, and in casing design, also must arrange the spatial accommodation of voltage changer 16 and the configuration of power lead 16A and 16B, and can't meet now requirement compact LCD.Except that this,, therefore be easy to generate the normal operation that Electromagnetic Interference influences LCD because voltage changer 16 belongs to high frequency assembly.
Therefore for display with double faces, can make in the casing design bigger space will be arranged if can reduce the number of voltage changer, to cater on the market demand, simultaneously and can effectively reduce cost to compact LCD.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of backlight assembly with simplified structure, to solve known application in the shortcoming of the backlight assembly of display with double faces.
First preferred embodiment of the present invention, disclose a kind of backlight assembly that is applied to comprise the display with double faces of two parallel display panels, this backlight assembly comprises a plurality of external electrode fluorescent lamp pipes (externalelectrode fluorescent lamp, EEFL), this external electrode fluorescent lamp pipe is arranged between this two display panels, respectively this external electrode fluorescent lamp pipe comprises one first electrode tip and one second electrode tip, and these first electrode tips are electrically connected with parallel way respectively with these second electrode tips.
Second preferred embodiment of the present invention, disclose a kind of backlight assembly that is applied to comprise the display with double faces of two parallel display panels, this backlight assembly comprises a two-sided luminous plane fluorescent fluorescent tube (flatfluorescent lamp), and this plane fluorescent fluorescent tube is located between this two display panels.
Because backlight assembly of the present invention utilizes external electrode fluorescent lamp pipe and plane fluorescent fluorescent tube to replace the light source of cathode fluorescent tube as display with double faces, and above-mentioned fluorescent tube can use single voltage changer to be driven, so can effectively reduce the number of voltage changer and power lead, avoid the difficulty of known application in the display with double faces design.
For a nearlyer step is understood feature of the present invention and technology contents, consult following about detailed description of the present invention and accompanying drawing.Yet accompanying drawing is only for reference and aid illustration usefulness, is not to be used for the present invention is limited.
Description of drawings
Fig. 1 is known one vertical view that is applied to the backlight assembly of display with double faces.
Fig. 2 is the diagrammatic cross-section of backlight assembly shown in Figure 1.
Fig. 3 is the vertical view of a backlight assembly of the present invention's first preferred embodiment.
Fig. 4 is the diagrammatic cross-section of backlight assembly shown in Figure 3.
Fig. 5 utilizes the synoptic diagram of a metal electrode parallel connection for the electrode of external electrode fluorescent lamp pipe.
Fig. 6 is the vertical view of a backlight assembly of the present invention's second preferred embodiment.
Fig. 7 is the diagrammatic cross-section of backlight assembly shown in Figure 6.
Fig. 8 is a plane fluorescent tube skeleton view of the present invention's second preferred embodiment.
The reference numeral explanation:
10 backlight assemblies, 12 frameworks
14 cathode fluorescent tube 14A, 14B electrode
16 voltage changer 16A, 16B power lead
18 diffuser plates, 20 display panels
50 backlight assemblies, 52 frameworks
54 external electrode fluorescent lamp pipe 54A, 54B electrode
56 voltage changer 56A, 56B power lead
58 diffuser plates, 60 display panels
70 backlight assemblies, 72 frameworks
74 plane fluorescent tube 74A, 74B electrode
16 voltage changer 76A, 76B power lead
78 diffuser plates, 80 display panels
Embodiment
With reference to figure 3 and Fig. 4, Fig. 3 is the vertical view of a backlight assembly 50 of the present invention's first preferred embodiment, and Fig. 4 is the diagrammatic cross-section of backlight assembly 50 shown in Figure 3.As shown in Figure 3 and Figure 4, backlight assembly 50 is arranged between the two parallel display panels 60, in order to provide each display panels 60 required light source.Backlight assembly 50 comprises a framework 52, and the many external electrode fluorescent lamp pipes 54 that are arranged in parallel, and this external electrode fluorescent lamp pipe 54 is fixed on the framework 52, and each root external electrode fluorescent lamp pipe 54 comprises that all two expose to electrode 54A and the 54B outside the framework 52.In addition, backlight assembly also comprises a voltage changer 56, and utilizes two power lead 56A and 56B to be connected to the electrode 54A and the 54B of each external electrode fluorescent lamp pipe 54 respectively, provides each external electrode fluorescent lamp pipe 54 required start voltage whereby.Wherein, each external electrode fluorescent lamp pipe 54 of backlight assembly 50 of the present invention itself all can be provided with one and stablize electric capacity, and therefore can share a voltage changer 56 is driven all external electrode fluorescent lamp pipes 54.Backlight assembly 50 also comprises two diffuser plates 58, and this two diffuser plate 58 is arranged at respectively between external electrode fluorescent lamp pipe 54 and two display panels 60, and the light source of scattering external electrode fluorescent lamp pipe 54 generations is to reach the effect of uniformly light-emitting whereby.In addition, generally be used to improve the optical module of backlight assembly luminescence efficiency,, all be arranged at as required in the backlight assembly 50 as prism and brightness enhancement film etc.
As shown in Figure 3 and Figure 4, because backlight assembly 50 of the present invention adopts external electrode fluorescent lamp pipe 54 as light source, and utilize single voltage changer 56 to drive, so the electrode 54A and the 54B of each external electrode fluorescent lamp pipe 54, utilize parallel way to be connected to the power lead 56A and the 56B of voltage changer 56 respectively, to reduce the quantity of lead effectively.It should be noted that, the electrode 54A of external electrode fluorescent lamp pipe 54 shown in Figure 4 utilizes parallel conducting wire to be connected to power lead 56A, and electrode 54B (not shown among Fig. 4) also utilizes parallel conducting wire to be connected to power lead 56B (not shown among Fig. 4), obtains the alternating voltage that voltage changer 56 provides whereby.Wherein, the function of voltage changer 56 is to provide High AC voltage, and is luminous to drive external electrode fluorescent lamp pipe 54.The present invention's first preferred embodiment utilizes floating type type of drive, its principle is to import phase reversal voltage respectively on two electrode 54A of externally electrode fluorescence lamp pipe 54 and the 54B to light a lamp with driving, for instance, if the light tube electric voltage of external electrode fluorescent lamp pipe 54 is 1KV, then floating type the driving in electrode 54A and 54B respectively to apply+alternating voltage of 0.5KV and-0.5KV drives external electrode fluorescent lamp pipe 54 whereby.
Yet, also can adopt other parallel way to reach identical effect except that the above-mentioned parallel way of lead of utilizing connects the electrode 54A and 54B of external electrode fluorescent lamp pipe 54.With reference to figure 5, Fig. 5 utilizes a metal electrode 59 synoptic diagram in parallel for the electrode 54A of external electrode fluorescent lamp pipe 54 and 54B.Compare with parallel way shown in Figure 4, backlight assembly 50 shown in Figure 5 is roughly the same with 50 configurations of the backlight assembly of Fig. 4, being in the electrode 54A of external electrode fluorescent lamp pipe 54 shown in Figure 5 that they are different utilizes a metal electrode 59 to reach effect in parallel, can optionally select an enforcement on actual job.
As mentioned above, because backlight assembly 50 of the present invention utilizes external electrode fluorescent lamp pipe 54 as back light, therefore only need a voltage changer 56 to be driven.The electrode 54A of external electrode fluorescent lamp pipe 54 and 54B only need utilize a lead or a metal electrode 59 to get final product with power lead 56A and the 56B that parallel way is connected to voltage changer 56 respectively in the case, so can effectively reduce voltage changer 56 and lead number, solve the known backlit component application in the difficult problem that display with double faces met with.
With reference to figure 6 and Fig. 7, Fig. 6 is the vertical view of a backlight assembly 70 of the present invention's second preferred embodiment, and Fig. 7 is the diagrammatic cross-section of backlight assembly 70 shown in Figure 6.As Fig. 6 and shown in Figure 7, backlight assembly 70 is arranged between the two parallel display panels 80, in order to provide display panels 80 required light source.Backlight assembly 70 comprises a framework 72, and a two-sided luminous plane fluorescent tube 74, and this plane fluorescent tube 74 is fixed on the framework 72, and plane fluorescent tube 74 comprises two electrode 74A and 74B.Backlight assembly also comprises a voltage changer 76, and utilizes two power lead 76A and 76B, is connected to the electrode 74A and the 74B of plane fluorescent tube 74 respectively, drives plane fluorescent tube 74 so that High AC voltage to be provided.Backlight assembly 70 also comprises two diffuser plates 78, and this two diffuser plate 78 is arranged at respectively between plane fluorescent tube 74 and two display panels 80, and the light source of scattering plane fluorescent tube 74 generations is to reach the effect of uniformly light-emitting whereby.In addition, generally be used to improve the optical module of backlight assembly luminescence efficiency,, all can fit and to be arranged in the backlight assembly 70 as prism and brightness enhancement film etc.Its midplane fluorescent tube 74 utilizes the various fluorescent tube of bending or serpentine configuration etc. to constitute, so that high brightness and even planar light source to be provided.With reference to figure 8, Fig. 8 is the skeleton view of the plane fluorescent tube 74 of the present invention's second preferred embodiment.As shown in Figure 8, plane fluorescent tube 74 is made up of a fluorescent tube with warp architecture, and utilize the electrode 74A that exposes to be electrically connected with voltage changer (Fig. 8 does not show) with 74B, simultaneously plane fluorescent tube 74 can utilize scatter plate (Fig. 8 does not show) to increase the light source uniformity coefficient, therefore can bring into play the luminescence efficiency identical with known many cathode fluorescent tubes that are arranged in parallel and produce uniform light source.
From the above, because backlight assembly 70 only need be provided with a plane fluorescent tube 74, can bring into play the luminescence efficiency that is equivalent to several cathode fluorescent tubes.Thus, backlight assembly 70 only need utilize a voltage changer 76 to drive plane fluorescent tube 74, and has reduced the quantity of required voltage transducer 76 with lead in large quantities, therefore can effectively reduce the known difficulty that backlight assembly met with that applies to display with double faces.
Compare with known technology, the disclosed backlight assembly of the present invention's two preferred embodiments, therefore all can reduce the number of voltage changer and lead effectively, can solve the difficult problem of known backlit assembly configuration voltages transducer and lead, and effectively reduce cost for how.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claims scope of the present invention change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (6)
1. backlight assembly, this backlight assembly are applied to a display with double faces that comprises two parallel display panels, and this backlight assembly comprises:
One light-emitting device, this light-emitting device is in order to produce light source, this light-emitting device is to be a plurality of external electrode fluorescent lamp pipes, respectively this external electrode fluorescent lamp pipe comprises first electrode tip and second electrode tip, this first electrode tip and second electrode tip are electrically connected to a voltage changer, make this light-emitting device obtain an alternating voltage and supply with;
One diffuser plate, this diffuser plate are arranged between this light-emitting device and this display panels; And
One frame, this frame and this diffuser plate and light-emitting device are fixed,
Wherein, described first electrode tip and second electrode tip expose to outside this framework.
2. backlight assembly as claimed in claim 1 is characterized in that: these first electrode tips are electrically connected with parallel way respectively with these second electrode tips.
3. backlight assembly as claimed in claim 1 is characterized in that: this voltage changer utilizes ralocatable mode to drive these external electrode fluorescent lamp pipes.
4. backlight assembly as claimed in claim 2 is characterized in that: these first electrode tips and these second electrode tips are parallel to a metal electrode respectively.
5. backlight assembly as claimed in claim 4 is characterized in that: respectively this metal electrode is to be a lead.
6. backlight assembly as claimed in claim 1 is characterized in that: this light-emitting device is used for double-side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100698700A CN100381912C (en) | 2004-07-13 | 2004-07-13 | Back light module for double side display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100698700A CN100381912C (en) | 2004-07-13 | 2004-07-13 | Back light module for double side display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1588209A CN1588209A (en) | 2005-03-02 |
| CN100381912C true CN100381912C (en) | 2008-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100698700A Expired - Fee Related CN100381912C (en) | 2004-07-13 | 2004-07-13 | Back light module for double side display |
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| Country | Link |
|---|---|
| CN (1) | CN100381912C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104658432B (en) * | 2015-03-11 | 2017-08-01 | 京东方科技集团股份有限公司 | Double-side display device, driving method and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000338483A (en) * | 1999-05-31 | 2000-12-08 | Nec Home Electronics Ltd | Liquid crystal display device |
| CN1318969A (en) * | 2000-04-20 | 2001-10-24 | 翰立光电股份有限公司 | Synchronous lamp ignitor |
| CN1412814A (en) * | 2001-10-12 | 2003-04-23 | 翰立光电股份有限公司 | Plane fluorescent lamp |
| CN1458547A (en) * | 2002-05-17 | 2003-11-26 | 三星电子株式会社 | Back lighting device, its driving method, and liquid crystal display with said device |
-
2004
- 2004-07-13 CN CNB2004100698700A patent/CN100381912C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000338483A (en) * | 1999-05-31 | 2000-12-08 | Nec Home Electronics Ltd | Liquid crystal display device |
| CN1318969A (en) * | 2000-04-20 | 2001-10-24 | 翰立光电股份有限公司 | Synchronous lamp ignitor |
| CN1412814A (en) * | 2001-10-12 | 2003-04-23 | 翰立光电股份有限公司 | Plane fluorescent lamp |
| CN1458547A (en) * | 2002-05-17 | 2003-11-26 | 三星电子株式会社 | Back lighting device, its driving method, and liquid crystal display with said device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1588209A (en) | 2005-03-02 |
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Granted publication date: 20080416 Termination date: 20210713 |