CN100578594C - Driving circuit for backlight module and the display panel with the same - Google Patents
Driving circuit for backlight module and the display panel with the same Download PDFInfo
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- CN100578594C CN100578594C CN200610058697A CN200610058697A CN100578594C CN 100578594 C CN100578594 C CN 100578594C CN 200610058697 A CN200610058697 A CN 200610058697A CN 200610058697 A CN200610058697 A CN 200610058697A CN 100578594 C CN100578594 C CN 100578594C
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Abstract
The invention relates to a backlight driving module for lighting multiple backlight blocks of a backlight module in a LCD panel. And the driving circuit comprises a converter, at least a transformer and multiple switch components, where the converter is used to convert a DC voltage into an AC voltage for outputting, the primary side of the transformer is used to receive the AC voltage from the converter and the transformer uses the secondary side to generate the driving voltage to light the backlight blocks; a switch component is arranged between each backlight block and the secondary side of the transformer to determine whether the transformer-outputted driving voltage at one end of the switch component can light the backlight block at the other end of the switch component. And the invention can improve dynamic picture quality, and reduce number of components, and has features of smaller volume, lower weight, and able to save electric energy.
Description
Technical field
The present invention relates to a kind of driving circuit, particularly relate to a kind of driving circuit of lighting the backlight module of display panel with high-frequency ac current.
Background technology
The photoelectricity correlation technique is constantly weeded out the old and bring forth the new in recent years, the digitrend of various electronic installations, the hierarchy of skill and the range of application of display have been enlarged, make common Display Types from the past cathode-ray tube (CRT) (Cathode Ray Tube, CRT) display has increased the LCD of using display panels again and has used plasma display of Plasmia indicating panel or the like.Wherein since these LCD compare other display and on displaying principle, be very different, so can reach high image quality easily, advantage such as volume is little, in light weight, driving voltage is low and consumed power is low, be applicable to personal digital assistant (personal digital assistant more, PDA), mobile phone, shoot with video-corder on consumer communications such as projector, notebook, TV and the electronic product, therefore, LCD has the trend that replaces cathode-ray tube display gradually and become the display main flow.
But because LCD is the display device that belongs to non-self-lighting, the secondary light source that therefore needs other is assisted its show image, just general alleged backlight.Because the development trend of LCD is to develop towards large scale at present, so often use cold cathode fluorescent lamp (cold cathode fluorescentlamp) to come backlight, because cold-cathode tube has that caliber is thin, luminosity is strong, light-emitting area is wide and advantage such as low-loss as the large scale liquid crystal display.
Fig. 1 illustrates the part synoptic diagram of a LCD 100, and LCD 100 has comprised an array of pixels 102 and the backlight module 104 in order to display frame.Usually array of pixels 102 and backlight module 104 overlap, but for convenience of description, in signal Figure 100 array of pixels 102 and backlight module 104 are provided with respectively.Wherein comprise a plurality of dot structures in the middle of the array of pixels 102, and comprised the cold-cathode tube 106 of a plurality of configured in parallel in the middle of the backlight module 104.
In order to improve the quality of dynamic menu, regular meeting uses scanning backlight (scan backlight) control model to come display frame at present.Wherein, whole array of pixels 102 can be divided into a plurality of demonstration blocks as shown in the figure, promptly show block 102a-102d, relatively, whole backlight module 104 also can be divided into the position and show the corresponding a plurality of blocks backlight of block, be block 104a-104d backlight, wherein can comprise at least one cold-cathode tube 106 in each block backlight.At this moment, under the scanning backlight control model, can be according to certain sequence to showing block 102a-102d charging.When charging shows block 102a-102d in regular turn, also can light corresponding to the block 104a-104d backlight that shows block 102a-102d, to show a complete image frame according to identical order.
So, all cold-cathode tubes 106 are lighted and are closed simultaneously in the backlight module 104, but are the action that unit lights and closes with the block, and the quantity of backlight driving unit also can increase because of the increase of block backlight.Shown in Figure 2 be cooperate backlight module 104 employed driving circuits 200 shown in Figure 1, block 104a wherein backlight as can be seen be by transverter 204a and transformer 206a driven, block 104b backlight be by transverter 204b and transformer 206b driven, block 104c backlight driven and block 104d backlight is driven by transverter 204d and transformer 206d by transverter 204c and transformer 206c.Transverter 204a-204d is provided by the electric energy that provided by direct supply 202.Under driving circuit 200, when needs are lighted one of them block backlight, just must start the pairing transverter of this block backlight, as just must start transverter 204b when desiring to light block 104b backlight, when desiring to light and close block 104a-104d backlight, just must activate and stop transverter 204a-204d with this predefined procedure with a predefined procedure.
Can find out some problems significantly in the middle of the framework of self-driven circuit 200.Quantity as driver element (and transverter and transformer) is too much, can increase the weight and the volume of display panel greatly.Circuit framework is too complicated, whenever has more once block backlight and must install one group of driver element additional.A large amount of transverter elements also can be accompanied by a large amount of switch change actions, causes the loss of electric energy.These problems all cause obstacle to the development of display panels, especially for undersized display panels.
Summary of the invention
The display panel that technical matters to be solved by this invention is to provide a kind of backlight module drive circuit and has this driving circuit is used among the display panels, reduces number of elements, and volume is less, weight is lighter, can save electric energy.
To achieve these goals, the invention provides a kind of backlight module drive circuit, in order to light the block a plurality of backlight that backlight module had in the display panels respectively, this kind driving circuit includes a transverter, at least one transformer and a plurality of on-off element, wherein, transverter is in order to receiving a direct current power supply, and exports after the DC voltage that this direct supply provided switched to alternating voltage.Transformer the first time side in order to receiving the alternating voltage of exporting by transverter, and by the second time side produce in order to drive the driving voltage of block backlight.On-off element can be installed in the second time of each block backlight and transformer respectively between the side, and can the driving voltage of exporting in order to the transformer that determines this on-off element one end light the block backlight of the on-off element other end.
Above-mentioned backlight module drive circuit, its characteristics are that this on-off element is non-to be switched on simultaneously and to close.
Above-mentioned backlight module drive circuit, its characteristics are that this transverter has two groups of commutation switch, this DC voltage can be switched to this alternating voltage by these two groups of commutation switch of mutual switching.
Above-mentioned backlight module drive circuit, its characteristics are that these two groups of commutation switch comprise a plurality of metal-oxide-semiconductor field effect ts.
Above-mentioned backlight module drive circuit, its characteristics are that this on-off element is two-way three-terminal switch.
Above-mentioned backlight module drive circuit, its characteristics be, also comprises the side and the side for the second time first time that a plurality of obstruct electric capacity are connected to this transformer, in order to intercept the flip-flop in this alternating voltage and this driving voltage.
The present invention also provides a kind of backlight module drive circuit, includes a transverter, multiple transformers and a plurality of on-off element, and wherein, transverter is in order to receiving a direct current power supply, and exports after the DC voltage that this direct supply provided switched to alternating voltage.The alternating voltage that the first time, side was all exported by transverter in order to reception of each transformer, and can be by the driving voltage of the side output second time in order to driving block backlight.Each transformer all can be connected with an on-off element, this on-off element can be installed on transformer the first time side and transverter between or transformer the second time side and block backlight between, in order to determine transformer that this on-off element connects can outputting drive voltage to light the block backlight that this transformer is connected.
Above-mentioned backlight module drive circuit, its characteristics are that this on-off element is respectively coupled between this transverter and this transformer, when this on-off element is switched on, can activates this transformer and export this driving voltage and light this block backlight.
Above-mentioned backlight module drive circuit, its characteristics be, this on-off element be respectively coupled to and this transformer and this block backlight between, when this on-off element was switched on, this driving voltage that this transformer is exported can be lighted this block backlight.
Above-mentioned backlight module drive circuit, its characteristics are that this on-off element is non-to be switched on simultaneously and to close.
Above-mentioned backlight module drive circuit, its characteristics are that this transverter has two groups of commutation switch, this DC voltage can be switched to this alternating voltage by these two groups of commutation switch of mutual switching.
Above-mentioned backlight module drive circuit, its characteristics are that these two groups of commutation switch comprise a plurality of metal-oxide-semiconductor field effect ts.
Above-mentioned backlight module drive circuit, its characteristics are that this on-off element is two-way three-terminal switch.
Above-mentioned backlight module drive circuit, its characteristics be, also comprises the side and the side for the second time first time that a plurality of obstruct electric capacity are connected to this transformer, in order to intercept the flip-flop in this alternating voltage and the driving voltage.
The present invention also provides a kind of display panel, and its characteristics are, comprise: an array of pixels comprises a plurality of demonstration blocks; One backlight module comprises a plurality of blocks backlight, and wherein the position of this block backlight and this demonstration block are in correspondence with each other; One backlight module drive circuit, in order to light this block backlight, wherein this backlight module drive circuit comprises: a transverter, in order to being an alternating voltage with a direct current voltage transitions; A plurality of transformers, wherein each this transformer can be converted to this alternating voltage one driving voltage, and wherein this driving voltage is for driving this block backlight; And a plurality of on-off elements, be respectively coupled between these a plurality of transformers and this transverter, whether light this a plurality of blocks backlight in order to decision, when wherein one of them was switched on when these a plurality of on-off elements, the driving voltage that the transformer that this on-off element coupled is exported can one of them be lighted with these a plurality of blocks backlight.
Above-mentioned display panel, its characteristics are that this on-off element is non-to be switched on simultaneously and to close.
Above-mentioned display panel, its characteristics are that this transverter has two groups of commutation switch, this DC voltage can be switched to this alternating voltage by these two groups of commutation switch of mutual switching.
Above-mentioned display panel, its characteristics are that these two groups of commutation switch comprise a plurality of metal-oxide-semiconductor field effect ts.
Above-mentioned display panel, its characteristics are that this on-off element is two-way three-terminal switch.
Above-mentioned display panel, its characteristics be, also comprises the side and the side for the second time first time that a plurality of obstruct electric capacity are connected to this transformer, in order to intercept the flip-flop in this alternating voltage and the driving voltage.
Effect of the present invention is to improve the dynamic menu quality, reduces number of elements, and volume is less, weight is lighter, can save electric energy.
Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.
Description of drawings
Fig. 1 is the part Organization Chart in the general display panel;
Fig. 2 is the backlight module drive circuit Organization Chart that is used in the general display panel;
Fig. 3 A is the backlight module drive circuit Organization Chart of an embodiment according to the invention;
Fig. 3 B is the backlight module drive circuit figure of an embodiment according to the invention;
Fig. 4 is the backlight module drive circuit Organization Chart that meets another embodiment of the present invention;
Fig. 5 is the backlight module drive circuit Organization Chart that meets another embodiment of the present invention.
Wherein, Reference numeral:
100: display panel 102: array of pixels
102a-102d: show block 104: backlight module
104a-104d: block 200 backlight: backlight module drive circuit framework
202: direct supply 204a-204d: transverter
206a-206d: transformer 300a: backlight module drive circuit framework
302: transverter 304: transformer
306a-306d: on-off element 300b: backlight module drive circuit
400: backlight module drive circuit framework 402a, 402b: transformer
500: backlight module drive circuit framework 502a-502d: transformer
Vdc: direct supply S1-S4: commutation switch
T: transformer M1-M4: two-way three-terminal switch
C1, C2: intercept electric capacity
Embodiment
In order in display panels, to realize the scanning backlight control model, to reach the purpose of improving the dynamic menu quality, formerly can all design one group of driver element (as transverter and transformer) for each block backlight in the backlight module among the technology, make each group driver element can light the block backlight that it connected individually.But so the circuit component in the backlight module drive circuit is rolled up, increase the burden of circuit on volume, weight and cost.Therefore key concept of the present invention is to use the driver element of lesser amt to light the block backlight of a greater number jointly, wherein is to utilize the switching of on-off element to decide to light which block backlight.
Fig. 3 A illustrates the backlight module drive circuit framework 300a of an embodiment according to the invention, has wherein comprised a transverter 302, a transformer 304 and on-off element 306a-306d.This drive circuit structure 300a is used among the display panel, as display panels, its effect is in order to lighting the backlight module among the display panel, and is to light backlight module in the mode of lighting the block 104a-104d backlight in the backlight module individually.
Generally in block 104a-104d backlight, can comprise a plurality of cold-cathode tubes as light emitting source, and cold-cathode tube need be with alternating voltage as power supply, so the DC voltage that need utilize transverter 302 to be provided by the direct supply 202 of display panel inside switches to and sends transformer 304 again to behind the alternating voltage and carry out the action of transformation, change into the alternating voltage that transverter 302 is exported and be fit to light the driving voltage that block 104a-104d backlight uses.
At this driving voltage of being exported by transformer 304 is employed in order to light block backlight all in the backlight module (being the block 104a-104d backlight in this example), that is to say and use one group of driver element (being transverter 302 and the transformer 304 in this example) can light all blocks backlight, saved the quantity of driver element widely.But under the scanning backlight control model, each backlight module all not necessarily together with the time light and close, therefore in the present embodiment, utilized on-off element 306a-306d to control lighting and closing of block 104a-104d backlight individually.On-off element 306a-306d installs respectively between block 104a-104d backlight and transformer 304.With on-off element 306a is example, the two ends of on-off element 306a have connected transformer 304 and block 104a backlight respectively, just turn-on switch component 306a gets final product when needs are lighted block 104a backlight, and so the driving voltage exported of transformer 304 just can be lighted block 104a backlight.In like manner, on-off element 306b-306d is controlling lighting and closing of block 104b-104d backlight respectively.
Fig. 3 B illustrates in the present embodiment in order to realize the backlight module drive circuit 300b of framework 300a shown in Fig. 3 A.Consult Fig. 3 A and 3B simultaneously, as can be seen, be to realize transverter 302 in driving circuit 300b, realize transformer 304 and realize on-off element 306a-306d with two-way three-terminal switch (Triac) M1-M4 with transformer T with commutation switch S1-S4 (as MOSFET, metal-oxide-semiconductor field effect t).Wherein, in parallel with a direct current power supply Vdc after commutation switch S1 and S3 connect mutually, commutation switch S2 and S4 are also in parallel with direct supply Vdc after connecting mutually.Transformer T the first time side two ends be connected between commutation switch S1, the S3 and between commutation switch S2, the S4.So, when being one group with commutation switch S1, S2, and with commutation switch S3, S4 for after another group switches mutually fast, just have the flow through side first time of transformer T of alternating current, and the side induction produces in order to light the AC drive voltage of block 104a-104d backlight the second time.
In the present embodiment, utilize two-way three-terminal switch M1-M4 be series at respectively transformer T the second time side and block 104a-104d backlight between as whether lighting the control element of block 104a-104d backlight, but also can utilize the controllable bidirectional breakover element of other kind to be used as this kind control element.As previously mentioned, just the two-way three-terminal switch M1 of conducting gets final product when needs are lighted block 104a backlight, so from second time of transformer T driving voltage that side is produced just block 104a backlight can be lighted.In like manner, two-way three-terminal switch M2-M4 is controlling lighting and closing of block 104b-104d backlight respectively.In addition, can connect respectively on the side in the first time of transformer the T side and the second time obstruct capacitor C 1 and C2 are in order to intercept the flip-flop in the electric current.
But consider the capacity limit of transformer, can use different transformers to come to provide driving voltage the block backlight of different piece.Fig. 4 illustrates the backlight module drive circuit framework 400 that meets another embodiment of the present invention, has wherein comprised a transverter 302, transformer 402a and 402b and on-off element 306a-306d.At this, the driving voltage of being exported by transformer 402a is only in order to lighting block 104a backlight and the 104b in the backlight module, and the driving voltage of being exported by transformer 402b is only in order to light block 104c backlight and the 104d in the backlight module.Driver element in the present embodiment has comprised a transverter (transverter 302) and two transformers ( transformer 402a and 402b), though so have more a transformer than the circuit framework 300a shown in Fig. 3 A, the capacity of transformer 402a and 402b can be little than the transformer among Fig. 3 A 304.
The effect of on-off element 306a-306d equally is lighting and closing in order to indivedual controls block 104a-104d backlight.On-off element 306a and 306b install respectively between block 104a backlight and 104b and transformer 402a, and on-off element 306c and 306d install respectively between block 104c backlight and 104d and transformer 402b.With on-off element 306a is example, the two ends of on-off element 306a have connected transformer 402a and block 104a backlight respectively, just turn-on switch component 306a gets final product when needs are lighted block 104a backlight, and so the driving voltage exported of transformer 402a just can be lighted block 104a backlight.In like manner, on-off element 306b-306d is controlling lighting and closing of block 104b-104d backlight respectively, but the driving voltage of block 104c backlight and 104d is provided by transformer 402b.
Similarly, in the present embodiment, the operation of transverter 302 can be reached by the quick switching of a plurality of commutation switch.On-off element 306a-306d can reach by the controllable bidirectional breakover element of two-way three-terminal switch or other kind.On first and second time side of transformer 402a, 402b, all can connect again in order to intercept the obstruct electric capacity of flip-flop.
In Fig. 3 A and circuit framework 300a and 400 shown in Figure 4, on-off element 306a-306d is installed on the side second time of transformer 304,402a and 402b.But when the quantity of transformer in the drive circuit structure equates with the quantity of block backlight, also on-off element can be installed on the side first time of transformer.Backlight module drive circuit framework 500 has as shown in Figure 5 wherein comprised a transverter 302, transformer 502a-502d and on-off element 306a-306d.At this, the quantity of transformer and block backlight is identical, and also the driving voltage of promptly being exported by transformer 502a-502d can be respectively in order to block 104a-104d backlight.Driver element in the present embodiment has comprised a transverter (transverter 302) and four transformers (transformer 502a-502d), though so can use more transformer, the capacity of transformer 502a-502d can be less.
The effect of on-off element 306a-306d equally is lighting and closing in order to indivedual controls block 104a-104d backlight, but in the present embodiment, on-off element 306a-306d installs respectively between transformer 502a-502d and transverter 302, and whether the activation that this moment, on-off element 306a-306d respectively can control transformer 502a-502d.With on-off element 306a is example, the two ends of on-off element 306a have connected transverter 302 and transformer 502a respectively, just turn-on switch component 306a gets final product when needs are lighted block 104a backlight, so can activate transformer 502a outputting drive voltage and light block 104a backlight and light.In like manner, on-off element 306b-306d is controlling the activation of transformer 502b-502d respectively and is stopping, and then has controlled lighting and closing of block 104b-104d backlight.
Similarly, in the present embodiment, the operation of transverter 302 can be reached by the quick switching of a plurality of commutation switch.On-off element 306a-306d can reach by the controllable bidirectional breakover element of two-way three-terminal switch or other kind.On first and second time side of transformer 502a-504d, all can connect again in order to intercept the obstruct electric capacity of flip-flop.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of claim of the present invention.
Claims (12)
1, a kind of backlight module drive circuit in order to light the block a plurality of backlight in the backlight module, is characterized in that, comprises:
One transverter is in order to being an alternating voltage with a direct current voltage transitions;
A plurality of transformers, wherein each this transformer can be converted to this alternating voltage one driving voltage, and this driving voltage is for driving this block backlight; And
A plurality of on-off elements are respectively coupled between these a plurality of transformers and this transverter, whether light this a plurality of blocks backlight in order to decision,
When wherein one of them was switched on when these a plurality of on-off elements, the driving voltage that the transformer that this on-off element coupled is exported can one of them be lighted with these a plurality of blocks backlight.
2, backlight module drive circuit according to claim 1 is characterized in that, this on-off element is non-to be switched on simultaneously and to close.
3, backlight module drive circuit according to claim 1 is characterized in that, this transverter has two groups of commutation switch, this DC voltage can be switched to this alternating voltage by these two groups of commutation switch of mutual switching.
4, backlight module drive circuit according to claim 3 is characterized in that, these two groups of commutation switch comprise a plurality of metal-oxide-semiconductor field effect ts.
5, backlight module drive circuit according to claim 1 is characterized in that, this on-off element is two-way three-terminal switch.
6, backlight module drive circuit according to claim 1 is characterized in that, also comprises the side and the side for the second time first time that a plurality of obstruct electric capacity are connected to this transformer, in order to intercept the flip-flop in this alternating voltage and the driving voltage.
7, a kind of display panel is characterized in that, comprises:
One array of pixels comprises a plurality of demonstration blocks;
One backlight module comprises a plurality of blocks backlight, and wherein the position of this block backlight and this demonstration block are in correspondence with each other;
One backlight module drive circuit, in order to light this block backlight, wherein this backlight module drive circuit comprises:
One transverter is in order to being an alternating voltage with a direct current voltage transitions;
A plurality of transformers, wherein each this transformer can be converted to this alternating voltage one driving voltage, and wherein this driving voltage is for driving this block backlight; And
A plurality of on-off elements, be respectively coupled between these a plurality of transformers and this transverter, whether light this a plurality of blocks backlight in order to decision, when wherein one of them was switched on when these a plurality of on-off elements, the driving voltage that the transformer that this on-off element coupled is exported can one of them be lighted with these a plurality of blocks backlight.
8, display panel according to claim 7 is characterized in that, this on-off element is non-to be switched on simultaneously and to close.
9, display panel according to claim 7 is characterized in that, this transverter has two groups of commutation switch, this DC voltage can be switched to this alternating voltage by these two groups of commutation switch of mutual switching.
10, display panel according to claim 9 is characterized in that, these two groups of commutation switch comprise a plurality of metal-oxide-semiconductor field effect ts.
11, display panel according to claim 7 is characterized in that, this on-off element is two-way three-terminal switch.
12, display panel according to claim 9 is characterized in that, also comprises the side and the side for the second time first time that a plurality of obstruct electric capacity are connected to this transformer, in order to intercept the flip-flop in this alternating voltage and the driving voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610058697A CN100578594C (en) | 2006-03-08 | 2006-03-08 | Driving circuit for backlight module and the display panel with the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610058697A CN100578594C (en) | 2006-03-08 | 2006-03-08 | Driving circuit for backlight module and the display panel with the same |
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| CN101034533A CN101034533A (en) | 2007-09-12 |
| CN100578594C true CN100578594C (en) | 2010-01-06 |
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| JP4956520B2 (en) * | 2007-11-13 | 2012-06-20 | ミツミ電機株式会社 | Backlight device and liquid crystal display device using the same |
| CN101989406B (en) * | 2009-07-29 | 2013-07-03 | 晨星软件研发(深圳)有限公司 | Display control circuit with extremely low power consumption and related method thereof |
| CN106205505B (en) * | 2016-08-23 | 2018-09-04 | 深圳市华星光电技术有限公司 | Backlight drive circuit |
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