CN1808247A - Backlight module of display panel - Google Patents
Backlight module of display panel Download PDFInfo
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- CN1808247A CN1808247A CN 200610007122 CN200610007122A CN1808247A CN 1808247 A CN1808247 A CN 1808247A CN 200610007122 CN200610007122 CN 200610007122 CN 200610007122 A CN200610007122 A CN 200610007122A CN 1808247 A CN1808247 A CN 1808247A
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Abstract
Disclosed is a display panel back light module which comprises a first light source group, a second light source group, a first transformer and a second transformer. The first light source group is placed on the first side of the display panel, and includes a first light source generating device and a second light source generating device. The second light source group is placed on the second side of the display panel, and includes a third light source generating device a forth light source generating device. The first transformer is coupled with the first light source generating device and the third light source generating device, and the second transformer is coupled with the second light source generating device and the forth light source generating device.
Description
Technical field
The present invention is relevant to a kind of backlight module of display panel, refers to a kind of display panel backlight module that reduces the picture distortion and save energy especially.
Background technology
Low priceization and high quality along with LCD, LCD be widely used in notebook computer, personal digital assistant (personal digital assistant, PDA), on the information products such as mobile phone, monitor and flat-surface television.Backlight module (backlight module) is one of crucial zero element of lcd products, because LCD is a kind of passive luminous flat-panel screens, therefore in the LCD of non-self-emitting light source, need to use backlight module that light source is provided, to reach night vision and high full-color requirement.Generally speaking, backlight module all is located at the rear side of display panel (displaypanel), comprise light-source generation device and diffuser plate (diffusing plate),, form suitable image by the pixel electrode on the control display panel again to provide homodisperse light to display panel.
Light-source generation device in the backlight module is generally cathode fluorescent tube (cold cathodefluorescent lamp, CCFL), external-electrode fluorescent lamp pipe (external electrodefluorescent lamp, EEFL) or light emitting diode (light emitted diode, LED).According to the light-source generation device position, backlight module can be divided into two kinds: light source produces straight-down negative (direct type) backlight module under display panel, and light source is near the side-light type the display panel side (edge light type) backlight module.Direct type backlight module is located at light-source generation device under the display panel, therefore can be applicable to the display panel of higher brightness demand or large-size, for example computer monitor and flat television etc.Side light type back light module is a side of light-source generation device being located at display panel, therefore can dwindle the volume and the manufacturing cost of LCD, generally is applied to small-sized electric equipment products.No matter be side light type back light module or direct type backlight module, its design concept all focuses on how to make backlight module that uniform light output can be arranged, that is allows backlight module can have uniform briliancy (luminance) to distribute.Simultaneously, how to reduce the important consideration that power consumption also is backlight module.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of backlight module 10 in the prior art.Backlight module 10 adopts the side-light type structure, comprises light-source generation device 11-14, transformer 15 and control circuit 16.Light-source generation device 11 and 12 is arranged at an end of display panel 18 rear sides, and light-source generation device 13 and 14 is arranged at the other end of display panel 18 rear sides.Light-source generation device 11-14 all is coupled to transformer 15, is controlled the illuminance of light-source generation device 11-14 by transformer 15.According to the image that display panel 18 desires show, backlight module 10 produces control voltage V by control circuit 16, and will control voltage V and reach transformer 15.Transformer 15 produces the drive current I of light-source generation device 11-14 again according to control voltage V.In backlight module 10, light-source generation device 11-14 can be unlocked or close simultaneously, and the luminosity of each light-source generation device also can be identical.When the user adjusted the screen intensity of display panel 18, backlight module 10 can be adjusted the size of drive current I, makes each light-source generation device that corresponding illuminance can be provided.Generally when the design backlight module, can wish that the setting range of screen intensity can be the bigger the better, yet be subject to the characteristic of light-source generation device, so drive current I also there is certain setting range.
Please refer to Fig. 2, Fig. 2 has illustrated the signal graph of light-source generation device when running in the backlight module 10.Among Fig. 2, transverse axis is represented the screen video control system, and (on-screen display, the OSD) value of control signal are adjusted OSD and can be adjusted parameters such as the color of display panel 18, contrast, brightness, patterns, to reach the best image state that the user wishes.OSD among Fig. 2 represents the control signal of screen intensity, and its range of control is 1-100, and OSD numerical value is high more, and screen intensity is also high more.The numerical value that Fig. 2 left side Y-axis indicates is represented the size of drive current I, and its unit is a milliampere, and the size of the numerical value that the right side Y-axis indicates representative control voltage V, its unit is a volt.Characteristic between drive current I and control voltage V and the OSD control signal is then represented by curve A and B respectively.In Fig. 2, the sample interval of OSD control signal is 5, and when the value of OSD control signal was 5 multiple, this moment, the value of corresponding drive current I and control voltage V was then represented by ". " on the curve A and the numeral that " ▲ " indicated on the curve B respectively.
As shown in Figure 2, because the restriction of light-source generation device self character, when OSD control signal during less than critical value (OSD=30), control voltage V and drive current I can't descend thereupon, but maintain when the OSD control signal value during critical value for this reason.This moment backlight module 10 backlight illumination be fixed, if the user still desire continue to turn down screen intensity, only can carry out digital processing at display image, to simulate the display image of low-light level, this kind mode can cause the picture distortion.In addition, the operating current of light-source generation device is between the 3-8.5 milliampere in the backlight module 10, cross low and when exceeding its desirable opereating specification, the uneven or phenomenon of flicker of light and shade can appear in light-source generation device when the operating current of light-source generation device, influence display quality greatly.Therefore when low OSD control signal range operation, generally drive current I can be located near (value when being equivalent to OSD=40) 3.5 milliamperes, to guarantee display quality.Therefore, under the prerequisite that does not cause the picture distortion, the user only can downgrade the brightness of display image that it is peaked 40%, if want screen intensity is further reduced, then need to carry out digital processing at display image, unavoidable meeting like this causes the picture distortion.
Formerly in the backlight module 10 of technology, light-source generation device can't provide high-quality display frame when hanging down drive current, also can't be effectively along with control signal descends.Therefore when showing the low-light level display image, often need carry out digital processing at display image, unavoidable ground can cause the picture distortion.
Summary of the invention
The invention provides a kind of backlight module that is applicable to display panel, it comprises first light sources, is located at first side of this display panel, and this first light sources comprises first light-source generation device and secondary light source generation device; The secondary light source group is located at second side of this display panel, and this secondary light source group comprises the 3rd light-source generation device and the 4th light-source generation device; First transformer is coupled to this first light-source generation device and the 3rd light-source generation device; And second transformer, be coupled to this secondary light source generation device and the 4th light-source generation device.
The present invention provides a kind of backlight module that is applicable to display panel in addition, it comprises first light sources, be located at first side of display panel, this first light sources comprises a plurality of first light-source generation device and a plurality of secondary light source generation device, and these a plurality of first light-source generation device are crisscross arranged in parallel with each other with these a plurality of secondary light source generation devices; The secondary light source group is located at second side of display panel, and this secondary light source group comprises a plurality of the 3rd light-source generation device and a plurality of the 4th light-source generation device, and the 3rd and the 4th light-source generation device is crisscross arranged in parallel with each other; First transformer is coupled to those first light-source generation device of this first light sources and those the 3rd light-source generation device of this secondary light source group; And second transformer, be coupled to those secondary light source generation devices of this first light sources and those the 4th light-source generation device of this secondary light source group.
The present invention provides a kind of method that drives the backlight module of display panel in addition, and it comprises the brightness that detects display panel desire display image; And when detecting brightness that this display panel desires display image less than predetermined value, first control module is opened the light-source generation device of being located at this display panel first side in first light sources, and closes the light-source generation device of being located at this display panel second side in this first light sources.
Description of drawings
Fig. 1 is the synoptic diagram of backlight module in the prior art.
Fig. 2 is the signal graph of light-source generation device when running in Fig. 1 backlight module.
Fig. 3 is the synoptic diagram of backlight module in the first embodiment of the invention.
Fig. 4 is the synoptic diagram of backlight module in the second embodiment of the invention.
Process flow diagram when Fig. 5 operates for backlight module among the present invention first and second embodiment.
Fig. 6 is the synoptic diagram of backlight module in the third embodiment of the invention.
Fig. 7 is the synoptic diagram of backlight module in the fourth embodiment of the invention.
Process flow diagram when Fig. 8 operates for backlight module among the present invention third and fourth embodiment.
[main element label declaration]
16,37,67 control circuits, 18,36,66 display panels
38,68 storage unit, 39,69 operation interfaces
31,32,61,62 light sources
510-560,810-860 step
I, I
U1-I
Un, I
L1-I
LnElectric current
V, V
1, V
2Voltage
11-14, U
1-U
n, L
1-L
nLight-source generation device
10,30,40,60,70 backlight modules
15,34,35,64,65 transformers
Osd screen video control system control signal
Embodiment
Please refer to Fig. 3, Fig. 3 is the synoptic diagram of backlight module 30 in the first embodiment of the invention.Backlight module 30 comprises two light sources, 31,32, two transformers 34,35, control circuit 37, storage unit 38, and operation interface 39.The user adjusts corresponding to color, contrast, brightness, the isoparametric control signal of pattern by operation interface 39.Control circuit 37 is coupled to transformer 34 and 35, is used for producing control voltage V according to the control signal that receives
1And V
2Storage unit 38 can comprise electricallyerasable ROM (EEROM), and (electrically erasable programmable read only memory EEPROM) or the storer of other kind, is used for storage data.Backlight module 30 adopts the side-light type structure, and light sources 31 and 32 is arranged at the two ends of display panel 36 rear sides respectively.In first embodiment, light sources 31 comprises two light-source generation device U
1And U
2, and light sources 32 comprises two light-source generation device L
1And L
2Transformer 34 is coupled to light-source generation device U
1And L
1, according to control voltage V
1Produce light-source generation device U respectively
1And L
1Drive current I
U1And I
L1Transformer 35 is coupled to light-source generation device U
2And L
2, V2 produces light-source generation device U respectively according to control voltage
2And L
2Drive current I
U2And I
L2In backlight module 30, each transformer can drive two light-source generation device, and light-source generation device U
1, U
2, L
1And L
2Can comprise cathode fluorescent tube, external-electrode fluorescent lamp pipe, or light emitting diode.
When the brightness of desiring display images when display panel 36 was lower than predetermined value (for example 50%), backlight module 30 of the present invention can have two kinds of operator schemes:
Pattern one: transformer 34 is opened light-source generation device U
1And close light-source generation device L
1, and transformer 35 is opened light-source generation device L
2And close light-source generation device U
2And
Pattern two: transformer 34 cuts out light-source generation device U
1And unlatching light-source generation device L
1, and transformer 35 cuts out light-source generation device L
2And unlatching light-source generation device U
2
In other words, when the brightness of display panel 36 desire display images was lower than 50%, light sources 31 and 32 respectively only had light-source generation device can be unlocked so that light to be provided, and the illuminance of the light-source generation device that is unlocked is then decided according to the brightness of display image.Explain with the OSD control signal of representing screen intensity equally, and its range of control is 1-100 that OSD numerical value is high more, screen intensity is also high more.For instance, set OSD=100 when the user passes through operation interface 39, transformer 34 and 35 is opened light-source generation device U simultaneously
1, U
2, L
1And L
2, and required drive current when producing each light-source generation device respectively and reaching its highest luminance and spend; Set OSD=80 when the user passes through operation interface 39, transformer 34 and 35 is opened light-source generation device U simultaneously
1, U
2, L
1And L
2, and produce 80% o'clock required drive current that each light-source generation device reaches its highest luminance degree respectively; When the user sets OSD=50 by operation interface 39, transformer 34 and 35 can cut out in four light-source generation device two light-source generation device (light-source generation device U in the pattern one as described above
2, L
1, or the light-source generation device U in the pattern two
1, L
2), and required drive current when producing each light-source generation device that is unlocked respectively and reaching its highest luminance and spend; When the user sets OSD=30 by operation interface 39, transformer 34 and 35 can cut out in four light-source generation device two light-source generation device (light-source generation device U in the pattern one as described above
2, L
1, or the light-source generation device U in the pattern two
1, L
2), and produce 60% o'clock required drive current that each light-source generation device that is unlocked reaches its highest luminance degree respectively.
In the backlight module 30 of first embodiment of the invention, control circuit 37 can comprise microprocessing unit, and (microprocessing unit MPU), can produce control voltage V
1And V
2To transformer 34 and 35.Yet the present invention also can use many group control circuits to produce control voltage V respectively
1And V
2Please refer to Fig. 4, Fig. 4 is the synoptic diagram of backlight module 40 in the second embodiment of the invention.Backlight module 40 comprises two control circuits 37, is used for producing respectively control voltage V
1And V
2To transformer 34 and 35.
Please refer to Fig. 5, the process flow diagram when Fig. 5 operates for backlight module 30 among the present invention first and second embodiment and 40.The process flow diagram of Fig. 5 comprises the following step:
Step 510: detect the brightness that display panel 36 is desired display image;
Step 520: whether the brightness of judging display panel 36 desire display images is less than predetermined value; The brightness of desiring display images when display panel 36 is during less than predetermined value, execution in step 540; When the brightness of display panel 36 desire display images is not less than predetermined value, execution in step 530;
Step 530: open all light-source generation device; Execution in step 560;
Step 540: open the light-source generation device in a light-source generation device and the light sources of being located at display panel 36 second sides in the light sources be located at display panel 36 first sides, and close another light-source generation device in another light-source generation device and the light sources of being located at display panel 36 second sides in the light sources of being located at display panel 36 first sides;
Step 550: the luminosity of desiring the light-source generation device that the brightness adjustment of display image is unlocked according to this display panel; And
Step 560: finish.
Can open all light-source generation device simultaneously in the prior art, foundation is desired the illuminance of each light-source generation device of brightness of display image again, so when the brightness of display image is lower than its maximal value 40%, need carries out digital processing and can cause the picture distortion at display image.In backlight module 30 of the present invention and 40, when the brightness of display panel 36 desire display images is lower than 50%, the two ends of display panel 36 rear sides each only have a light-source generation device that light can be provided, so can earlier brightness be reduced half, then the illuminance of the light-source generation device that is unlocked according to the brightness adjustment of display image again.Therefore, under the prerequisite that does not cause the picture distortion, backlight module 30 of the present invention and 40 can provide the adjustment of brightness in a big way.In addition, when the brightness of display panel 36 desire display images was lower than 50%, two light-source generation device that are unlocked in four light-source generation device were each positioned at the two ends of display panel 36 rear sides, even like this when the illumination of low-light level, also can provide uniform illuminance.
Backlight module 30 of the present invention and 40 also can be saved power consumption.According to the characteristic of light-source generation device itself, when drive current diminished, its voltage can raise.For instance, it is 6 MAHs that a light-source generation device is worked as its drive current, and its voltage is about 600 volts, and reduces to 3 MAHs when its drive current, and its voltage is about 700 volts.In order to reach certain brightness, the backlight module 10 in the prior art uses 3 milliamperes drive current to drive 4 light-source generation device, and backlight module of the present invention 30 uses 6 milliamperes drive current to drive 2 light-source generation device.Therefore, backlight module 10,30,40 power P that consumed 10, P30, P40 distinguish as follows:
P10 4*700*3=8.4 (watt);
P30=P40 2*600*6=7.2 (watt);
Therefore, under the requirement of certain brightness, backlight module 30 of the present invention and 40 can be saved about 15% power consumption.
Please refer to Fig. 6, Fig. 6 is the synoptic diagram of backlight module 60 in the third embodiment of the invention.Backlight module 60 comprises two light sources, 61,62, two transformers, 64,65, one control circuits, 67, one storage unit 68, and an operation interface 69.The user adjusts corresponding to color, contrast, brightness, the isoparametric control signal of pattern by operation interface 69.Control circuit 67 is coupled to transformer 64 and 65, is used for producing control voltage V according to the control signal that receives
1And V
2Storage unit 68 can comprise the storer of electricallyerasable ROM (EEROM) or other kind, is used for storage data.Backlight module 60 adopts the side-light type structure, and light sources 61 and 62 is arranged at the two ends of display panel 66 rear sides respectively.In the 3rd embodiment, light sources 61 comprises a plurality of light-source generation device U
1-U
n, and light sources 62 comprises a plurality of light-source generation device L
1-L
nTransformer 64 is coupled to the odd number group light-source generation device U of light sources 61
1-U
N-1Odd number group light-source generation device L with light sources 62
1-L
N-1, according to control voltage V
1Produce the drive current of odd number group light-source generation device respectively.Transformer 65 is coupled to the even number set light-source generation device U of light sources 61
2-U
nEven number set light-source generation device L with light sources 62
2-L
n, according to control voltage V
2Produce the drive current of even number set light-source generation device respectively.In backlight module 60, each transformer can drive n light-source generation device, and two adjacent light-source generation device are to be controlled by different transformers in each light sources, and light-source generation device U
1-U
nAnd L
1-L
nCan comprise cathode fluorescent tube, external-electrode fluorescent lamp pipe, or light emitting diode.
When the brightness of desiring display images when display panel 66 was lower than predetermined value (for example 50%), backlight module 60 of the present invention can have two kinds of operator schemes:
Pattern three: transformer 64 is opened the odd number group light-source generation device U of light sources 61
1-U
N-1And close the odd number group light-source generation device L of light sources 62
1-L
N-1, and transformer 65 is opened the even number set light-source generation device L of light sources 62
2-L
nAnd close the even number set light-source generation device U of light sources 61
2-U
nAnd
Pattern four: transformer 64 cuts out the odd number group light-source generation device U of light sources 61
1-U
N-1And the odd number group light-source generation device L of unlatching light sources 62
1-L
N-1, and transformer 65 cuts out the even number set light-source generation device L of light sources 62
2-L
nAnd the even number set light-source generation device U of unlatching light sources 61
2-U
n
In other words, when the brightness of display panel 66 desire display images was lower than 50%, light sources 61 and 62 respectively only had the light-source generation device of half can be unlocked so that light to be provided, and the illuminance of the light-source generation device that is unlocked is then decided according to the brightness of display image.In the backlight module 60 of third embodiment of the invention, control circuit 67 can comprise microprocessing unit, can produce control voltage V
1And V
2To transformer 64 and 65.Yet the present invention also can use many group control circuits to produce control voltage V respectively
1And V
2Please refer to Fig. 7, Fig. 7 is the synoptic diagram of backlight module 70 in the fourth embodiment of the invention.Backlight module 70 comprises two control circuits 67, is used for producing respectively control voltage V
1And V
2To transformer 64 and 65.
Please refer to Fig. 8, the process flow diagram when Fig. 8 operates for backlight module 60 among the present invention third and fourth embodiment and 70.The process flow diagram of Fig. 8 comprises the following step:
Step 810: detect the brightness that display panel 66 is desired display image;
Step 820: whether the brightness of judging display panel 66 desire display images is less than predetermined value; The brightness of desiring display images when display panel 66 is during less than predetermined value, execution in step 840; When the brightness of display panel 66 desire display images is not less than predetermined value, execution in step 830;
Step 830: open all light-source generation device; Execution in step 860;
Step 840: open the even number set light-source generation device in odd number group light-source generation device and the light sources of being located at display panel 66 second sides in the light sources be located at display panel 66 first sides, and close the odd number group light-source generation device in even number set light-source generation device and the light sources of being located at display panel 66 second sides in the light sources of being located at display panel 66 first sides;
Step 850: the luminosity of the light-source generation device that the brightness adjustment of desiring display image according to display panel 66 is unlocked; And
Step 860: finish.
The display panel of prior art need carry out digital processing at display image when showing the image of low-light level, therefore can cause the picture distortion.In backlight module of the present invention, when the brightness of display panel desire display image is lower than predetermined value, be located in two light sources at two ends of display panel rear side, each only has the light-source generation device of half number that light can be provided, so can earlier brightness be reduced half, then the illuminance of the light-source generation device that is unlocked according to the brightness adjustment of display image again.Therefore, under the prerequisite that does not cause the picture distortion, backlight module of the present invention can provide the adjustment of brightness in a big way, can provide uniform illuminance simultaneously, and can save power consumption.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (16)
1. a backlight module is applicable to display panel, comprises:
First light sources is located at first side of this display panel, and this first light sources comprises first light-source generation device and secondary light source generation device;
The secondary light source group is located at second side of this display panel, and this secondary light source group comprises the 3rd light-source generation device and the 4th light-source generation device;
First transformer is coupled to this first light-source generation device and the 3rd light-source generation device; And
Second transformer is coupled to this secondary light source generation device and the 4th light-source generation device.
2. backlight module according to claim 1 also comprises:
First transformer control circuit is coupled to this first transformer; And
Second transformer control circuit is coupled to this second transformer.
3. backlight module according to claim 2, wherein each transformer control circuit comprises microprocessing unit.
4. backlight module according to claim 1 also comprises transformer control circuit, is coupled to this first and second transformer.
5. backlight module according to claim 4, wherein this transformer control circuit comprises microprocessing unit.
6. backlight module according to claim 1, wherein those light-source generation device comprise cathode fluorescent tube, external-electrode fluorescent lamp pipe or light emitting diode.
7. a backlight module is applicable to display panel, comprises:
First light sources is located at first side of display panel, and this first light sources comprises a plurality of first light-source generation device and a plurality of secondary light source generation device, and these a plurality of first light-source generation device are crisscross arranged in parallel with each other with these a plurality of secondary light source generation devices;
The secondary light source group is located at second side of display panel, and this secondary light source group comprises a plurality of the 3rd light-source generation device and a plurality of the 4th light-source generation device, and the 3rd and the 4th light-source generation device is crisscross arranged in parallel with each other;
First transformer is coupled to those first light-source generation device of this first light sources and those the 3rd light-source generation device of this secondary light source group; And
Second transformer is coupled to those secondary light source generation devices of this first light sources and those the 4th light-source generation device of this secondary light source group.
8. backlight module according to claim 7 also comprises:
First transformer control circuit is coupled to this first transformer; And
Second transformer control circuit is coupled to this second transformer.
9. backlight module according to claim 8, wherein each transformer control circuit comprises microprocessing unit.
10. backlight module according to claim 7 also comprises transformer control circuit, is coupled to this first and second transformer.
11. backlight module according to claim 10, wherein this transformer control circuit comprises microprocessing unit.
12. backlight module according to claim 7, wherein those light-source generation device comprise cathode fluorescent tube, external-electrode fluorescent lamp pipe or light emitting diode.
13. a method that drives the backlight module of display panel comprises:
Detect display panel and desire the brightness of display image; And
When detecting brightness that this display panel desires display image less than predetermined value, first control module is opened the light-source generation device of being located at this display panel first side in first light sources, and closes the light-source generation device of being located at this display panel second side in this first light sources.
14. method according to claim 13 also comprises:
When the brightness that detects this display panel desire display image was not less than this predetermined value, this first control module was opened all light-source generation device in this first light sources.
15. method according to claim 13, also comprise when detecting brightness that this display panel desires display image less than this predetermined value, second control module is closed the light-source generation device of being located at this display panel first side in the secondary light source group, and opens the light-source generation device of being located at this display panel second side in this secondary light source group.
16. method according to claim 15 also comprises:
When the brightness that detects this display panel desire display image was not less than this predetermined value, this second control module was opened all light-source generation device in this secondary light source group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610007122 CN1808247A (en) | 2006-02-09 | 2006-02-09 | Backlight module of display panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610007122 CN1808247A (en) | 2006-02-09 | 2006-02-09 | Backlight module of display panel |
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| Publication Number | Publication Date |
|---|---|
| CN1808247A true CN1808247A (en) | 2006-07-26 |
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ID=36840222
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107749277A (en) * | 2017-10-16 | 2018-03-02 | 维沃移动通信有限公司 | A kind of control method of screen intensity, device and mobile terminal |
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2006
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107749277A (en) * | 2017-10-16 | 2018-03-02 | 维沃移动通信有限公司 | A kind of control method of screen intensity, device and mobile terminal |
| CN107749277B (en) * | 2017-10-16 | 2022-05-17 | 维沃移动通信有限公司 | Screen brightness control method and device and mobile terminal |
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