CN104424877A - Projection display device and driving method - Google Patents
Projection display device and driving method Download PDFInfo
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- CN104424877A CN104424877A CN201310410674.4A CN201310410674A CN104424877A CN 104424877 A CN104424877 A CN 104424877A CN 201310410674 A CN201310410674 A CN 201310410674A CN 104424877 A CN104424877 A CN 104424877A
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Abstract
The invention discloses a projection display device and a driving method. The projection display device comprises an image processing module and a light source driver. The image processing module is used for receiving image data and generating a display signal, wherein the display signal comprises an image period and a dark state period. The light source driver is used for generating a light source driving signal so as to drive a projection light source, wherein the light source driving signal has a first zone and a second zone in the dark state period, and the signal averaging amplitude in the second zone of the light source driving signal is lower than that in the image period of the light source driving signal.
Description
Technical field
The present invention has about a kind of projection display equipment, and relates to a kind of projection display equipment and its driving method that use dark picture insertion technology especially.
Background technology
Along with the lifting of image analytic degree, the requirement for the display quality of image is also more and more higher.The origin cause of formation causing show image fuzzy has many, such as, when the reaction time of display picture element excessively slow, image zoom reduces resolution mend point or remove, image compression causes distortion or human eye chases after for the vision of movement fast and causes dynamic image display fuzzy.
Please refer to Fig. 1, Fig. 1 is the schematic diagram illustrating a kind of dark picture insertion according to prior art.In the prior art, the wherein a kind of mode for the improvement of the display quality of dynamic image is the dark picture of insertion (black frame insertion).As shown in Figure 1, generally speaking, the mode inserting dark picture normally with the time of fixed proportion to image data 100 inserting black picture data 102, make image data 100 have image period Ta and dark-state period Tb.If the back light source brightness in display device is fixed (as shown in light source drive signal 120), dark-state period Tb arranges longer, then the actual output brightness of image display is lower.Moreover in fact in dark-state period Tb, display device is actually and does not export any image, therefore the power that the backlight of display device produces forms extra power dissipation equivalently, and the dynamic contrast of display device also can be caused to decline.
Thus, up to now, be familiar with this field person invariably its effort poor look for its solution, to improve above-mentioned problem crux.
Summary of the invention
In order to solve the above problems, this disclosure provides a kind of projection display equipment.Projection display equipment comprises image processing module and light source drive.Image processing module in order to receive image data and to produce display, during wherein aforesaid display comprises image with dark-state during.Light source drive is in order to produce light source drive signal to drive projection light source, wherein aforesaid light source drive signal during dark-state in there is the first section and the second section, and light source drive signal at the signal averaging amplitude of the second section lower than the signal averaging amplitude in light source drive signal is during image.
According to one embodiment of the invention, wherein aforesaid light source drive signal is greater than the signal averaging amplitude of light source drive signal in the signal averaging amplitude of the second section and light source drive signal are during image at the signal averaging amplitude of the first section.
According to one embodiment of the invention, wherein when aforesaid light source drive signal is in positive half cycle, light source drive signal at the current level of the first section higher than the current level of light source drive signal at the second section.
According to one embodiment of the invention, wherein when aforesaid light source drive signal is in negative half period, light source drive signal at the current level of this second section higher than the current level of light source drive signal at the first section.
According to one embodiment of the invention, wherein aforesaid light source drive signal the signal averaging amplitude of this second section be approximately this light source drive signal during this image in signal averaging amplitude 30%.
According to one embodiment of the invention, wherein aforesaid light source drive signal this first and the signal averaging amplitude of this second section be zero.
Another aspect of the present invention is to provide a kind of projection display equipment.Projection display equipment comprises image process unit, display unit, microcontroller, light source drive and projection light source.Display unit is electrically connected image process unit, and display unit is in order to produce a signal of video signal, during wherein signal of video signal comprises image with dark-state during.Microcontroller is electrically connected image process unit.Light source drive is electrically connected microcontroller and display unit.Projection light source is electrically connected light source drive, and in order to project signal of video signal to projection screen, wherein light source drive is in order to produce a light source drive signal to drive aforesaid projection light source, and light source drive signal has the first section and the second section during dark-state, light source drive signal the signal averaging amplitude of the second section be not more than light source drive signal during image in signal averaging amplitude.
Another aspect of the present invention provides a kind of in order to drive projection display equipment with the driving method of image data displaying.Driving method comprises the following step: receive and adjust image data, during making image data have an image with a dark-state during; And the light source drive signal of the projection light source of adjustment projection display equipment, make light source drive signal during dark-state, have the first section and the second section, and light source drive signal at the signal averaging amplitude of the second section lower than the signal averaging amplitude in this light source drive signal is during image.
According to one embodiment of the invention, in the step of the wherein light source drive signal of the projection light source of aforesaid adjustment projection arrangement, more light source drive signal is set to be greater than the signal averaging amplitude of light source drive signal in the signal averaging amplitude of the second section and light source drive signal are during image at the signal averaging amplitude of the first section.
According to one embodiment of the invention, wherein when aforesaid light source drive signal is in positive half cycle, light source drive signal is set to higher than the current level of light source drive signal at the second section at the current level of the first section.
According to one embodiment of the invention, wherein when aforesaid light source drive signal is in negative half period, light source drive signal is set to higher than the current level of light source drive signal at the first section at the current level of the second section.
According to one embodiment of the invention, wherein by light source drive signal the signal averaging amplitude of this second section be set to light source drive signal during image in signal averaging amplitude 30%.
According to one embodiment of the invention, wherein in the step of a light source drive signal of a projection light source of this projection arrangement of adjustment, more aforesaid light source drive signal is set to zero at the signal averaging amplitude of the first and second sections.
In sum, technical scheme of the present invention compared with prior art has obvious advantage and beneficial effect.By technique scheme, can reach suitable technical progress, and have the extensive value in industry, this disclosure provides a projection display equipment and its driving method, can improve image quality and reduce power consumption simultaneously.
By with embodiment, above-mentioned explanation is explained in detail below, and technical scheme of the present invention is provided further explains.
Accompanying drawing explanation
For above and other object of the present invention, feature, advantage and embodiment can be become apparent, being described as follows of institute's accompanying drawings:
Fig. 1 is the schematic diagram illustrating a kind of dark picture insertion according to prior art;
Fig. 2 is the schematic diagram illustrating a kind of projection display equipment according to one embodiment of the invention;
Fig. 3 is the oscillogram illustrating light source drive signal according to one embodiment of the invention;
Fig. 4 A is the oscillogram illustrating light source drive signal according to further embodiment of this invention;
Fig. 4 B is the schematic diagram illustrating a kind of light source drive as shown in Figure 2 according to the embodiment of the present invention; And
Fig. 5 is the schematic diagram illustrating a kind of driving method according to one embodiment of the invention.
Wherein, description of reference numerals is as follows:
Image data: 100
Black picture data: 102
Light source drive signal: 120
Projection display equipment: 200
Image processing module: 220
Image process unit: 222
Display unit: 224
Light source drive: 240
Projection light source: 260
Microcontroller: 280
Input interface: 282
Storer: 284
Brightness control module: 420
Light-adjusting module: 440
Power transfer module: 460
Driving method: 500
Step: 510,520
During image: Ta
During dark-state: Tb
First section: T1
Second section: T2
Image data: Vimage
Display: Vdata
Light source drive signal: Vdrive
Current controling signal: Vctrl1
Dimming control signal: Vctrl2
Dim signal: Vdimm
Embodiment
Hereafter institute's accompanying drawings is coordinated to elaborate for embodiment, but the embodiment provided also is not used to limit the scope that contains of the present invention, and the description of structure operation is not used to limit its order performed, any structure reconfigured by element, produce the device with impartial effect, be all the scope that the present invention is contained.In addition, graphic only for the purpose of description, do not map according to life size.For making to be convenient to understand, in following explanation, similar elements illustrates with identical symbology.
About " first " used herein, " second " ... etc., the not special meaning of censuring order or cis-position, is also not used to limit the present invention, and it is only used to distinguish the element or operation that describe with constructed term.
About " about " used herein, " approximately " or " roughly " be commonly the error of exponential quantity or scope within 20 of percentage, be within 10 preferably, be then within 5 percent more preferably.Wen Zhongruo is without clearly stating, and the numerical value mentioned by it all regards as approximate value, such as can error represented by " about ", " approximately " or " roughly " or scope, or other approximate values.
In addition, about " coupling " used herein or " connection ", all can refer to two or multiple element mutually directly make entity or in electrical contact, or mutually indirectly put into effect body or in electrical contact, also can refer to two or multiple element mutual operation or action.
Please refer to Fig. 2, Fig. 2 illustrates a kind of schematic diagram of projection display equipment according to one embodiment of the invention.As shown in Figure 2, projection display equipment 200 comprises image processing module 220 and light source drive 240.Image processing module 220 is in order to receive image data Vimage and to produce display Vdata, and wherein aforesaid display Vdata has image period Ta and dark-state period Tb.In other words, image data Vimage carries out image processing by image processing module 220, uses aforesaid dark picture to insert technology thus, make the waveform of display Vdata have image period Ta and dark-state period Tb to image data Vimage.Light source drive is in order to produce light source drive signal Vdrive to drive the projection light source 260 in projection display equipment 200, and light source drive signal Vdrive has the first section and the second section in aforesaid dark-state period Tb, light source drive signal Vdrive at the signal averaging amplitude of the second section lower than the signal averaging amplitude of light source drive signal Vdrive in image period Ta (as shown in following Fig. 3).In brief, in the dark-state period Tb of display Vdata, reduced the power consumption of projection display equipment 200 by the signal averaging amplitude reduced or close light source drive signal Vdrive, and the background luminance in dark-state period Tb is reduced to add overall dynamic contrast simultaneously.
It should be noted that aforesaid light source drive signal Vdrive can be voltage signal or current signal, also can make a general reference the drive current flowing through projection light source 260, the present invention, not as limit, is familiar with the visual practical application relative set of this field person.
On the other hand, as shown in Figure 2, image processing module 220 can comprise image process unit 222 and display unit 224 further.Image process unit can in order to image data Vimage computing and perform dark picture insert operation, and display unit 224 is electrically connected image process unit 222, display unit 224 is in order to produce and to show aforesaid display Vdata, and display unit 224 can be the panel or corresponding liquid crystal panel etc. with light valve.Moreover projection display equipment also further can comprise microcontroller 280 and storer 284.Microcontroller 280 is in order to receive input interface 282 with the control signal of input to carry out Dimming operation, and storer 284 is electrically connected image process unit 222, cushion space required when storer 284 can perform computing in order to provide image process unit 222.For example, input interface 282 can be keyboard or infrared remote controller etc.And structurally, microcontroller 280 is electrically connected input interface 282, light source drive 240 is electrically connected microcontroller 280 and display unit 224, projection light source 260 is then electrically connected between light source drive 240, carry out corresponding brightness adjustment control, and the image that display unit 224 is shown (example: display Vdata) be projeced into projection screen.
Below by describing embodiments different in content of the present invention, to complete above-mentioned adjustment light source drive signal Vdrive.Please refer to Fig. 3, Fig. 3 is the oscillogram illustrating light source drive signal according to one embodiment of the invention.As shown in Figure 3, in the dark-state period Tb of display Vdata, light source drive signal Vdrive has the first section T1 and the second section T2, and light source drive signal Vdrive at the signal averaging amplitude of the second section T2 lower than the signal averaging amplitude of light source drive signal Vdrive in image period Ta.In this embodiment, light source drive signal Vdrive is greater than light source drive signal Vdrive at the signal averaging amplitude of the second section T2 and the signal averaging amplitude of light source drive signal in image period Ta at the signal averaging amplitude of the first section T1.For example, projection display equipment 200 projection light source 260 can be high-pressure discharge lamp (UHP lamp).The drive characteristic of high-pressure discharge lamp by drive current (that is light source drive signal Vdrive) by electrode in light fixture time, reach luminous characteristic by the high-voltage tip discharging of electrode.
In operation, when driving current through electrode, light source drive signal Vdrive can increase at the signal averaging amplitude of the first section T1 with transient rise brightness by we, the scintillation produced when reducing drive current commutation, so can increase the electrode shape design of high-pressure discharge lamp and the serviceable life of light fixture.And when the second section T2, the signal averaging amplitude of light source drive signal Vdrive can be reduced, to save unnecessary power consumption.Such as, as shown in Figure 3, when light source drive signal Vdrive is in positive half cycle, light source drive signal Vdrive at the current level of the first section T1 higher than the current level of light source drive signal Vdrive at the second section.Otherwise, when light source drive signal Vdrive is in negative half period, light source drive signal Vdrive at the current level of the second section T2 higher than the current level of light source drive signal Vdrive at the first section T1.In practical application, when projection light source 260 is high-pressure discharge lamp, characteristic due to high-pressure discharge lamp does not allow can open fast or close at short notice, therefore aforesaid light source drive signal Vdrive approximately can be set to 30% of the signal averaging amplitude of light source drive signal Vdrive in image period Ta at the signal averaging amplitude of the second section T2, but the present invention is not as limit, be familiar with this field person visual practical application elasticity adjustment.
Please refer to Fig. 4 A, Fig. 4 A illustrates the oscillogram of light source drive signal according to further embodiment of this invention.As shown in Figure 4 A, in this embodiment, aforesaid projection light source 260 can be solid-state lighting lamp source (solidstate illumination, or LED lamp SSI), owing to opening fast in the light source characteristic permission time of its solid-state lighting lamp source or LED light lamp or closing, therefore can be zero at the signal averaging amplitude of the first section T1 and the second section T2 by light source drive signal Vdrive in the present embodiment, eliminate the power dissipation in dark-state period Tb completely.
Please refer to Fig. 4 B, Fig. 4 B is the schematic diagram illustrating a kind of light source drive as shown in Figure 2 according to the embodiment of the present invention.As shown in Figure 4 B, in the foregoing embodiments, light source drive 240 can be applicable to the embodiment of Fig. 4 A, and can comprise brightness control module 420, light-adjusting module 440 and power transfer module 460 further.Brightness control module 420 is in order to produce dim signal Vdimm according to current controling signal Vctrl1 and dimming control signal Vctrl2.Light-adjusting module 440 is in order to adjust the brightness of projection light source 260 according to dim signal 440.Power transfer module 460 is in order to change and to export a driving voltage source.For example, brightness control module 420 can be PWM control module or fixed current controling circuit, carry out back coupling by the sensing resistor under light-adjusting module 440 to control, and light-adjusting module 440 can be power switch or multiple adjustable current limiting switch array, by being adjusted the signal averaging amplitude of aforesaid light source drive signal Vdrive by current controling signal Vctrl1, and complete corresponding brightness adjustment control by dimming control signal Vctrl2.Moreover please refer to Fig. 2, projection display equipment 200 can receive aforesaid current controling signal Vctrl1 and dimming control signal Vctrl2 further via microcontroller 280 from input interface 282 in the present embodiment.
Another aspect of the present invention is to provide a kind of in order to drive a projection display equipment with the driving method of image data displaying.Please refer to Fig. 5, Fig. 5 is the schematic diagram illustrating a kind of driving method according to one embodiment of the invention.As shown in Figure 5, driving method 500 comprises step 510 and step 520.In step 510, by receiving and adjusting image data, to make image data, there is an an image period Ta and dark-state period Tb.For example, after receiving image data by audio-visual transmission interface, and image data is carried out to the computing of dark picture insertion, make image data have image period Ta and dark-state period Tb by this.In step 520, the light source drive signal Vdrive of the projection light source of adjustable projection display equipment, make light source drive signal Vdrive during dark-state, have one first section T1 and the second section T2, and light source drive signal Vdrive at the signal averaging amplitude of the second section T2 lower than the signal averaging amplitude of light source drive signal Vdrive in image period Ta.
In step 520, further light source drive signal Vdrive can be set to be greater than light source drive signal Vdrive at the signal averaging amplitude of the second section T2 and the signal averaging amplitude of light source drive signal Vdrive in image period Ta at the signal averaging amplitude of the first section T1.For example, as shown in Figure 3, when the projection light source 260 of projection display equipment 200 is high-pressure discharge lamp, according to the characteristic of high-pressure discharge lamp, light source drive signal Vdrive can be increased at the signal averaging amplitude of the first section T1, and when the second section T2, the signal averaging amplitude of light source drive signal Vdrive can be reduced, to save unnecessary power consumption.Such as, when light source drive signal Vdrive is in positive half cycle, light source drive signal Vdrive can be arranged at higher than the current level of light source drive signal Vdrive at the second section T2 at the current level of the first section T1.Otherwise, when light source drive signal Vdrive is in negative half period, light source drive signal Vdrive can be arranged at higher than the current level of light source drive signal Vdrive at the first section T1 at the current level of the second section T2.In this embodiment, aforesaid light source drive signal Vdrive can be set to 30% of the signal averaging amplitude of light source drive signal Vdrive in image period Ta at the signal averaging amplitude of the second section T2.
On the other hand, in step 520, further light source drive signal Vdrive can be set to zero at the signal averaging amplitude of the first section T1 and the second section T2, reduce the power consumption of projection display equipment in dark-state period Tb.For example, as shown in Figure 4 A, if the projection light source of projection display equipment 200 260 be solid-state lighting lamp source or LED light lamp time, can during dark-state in Tb light source drive signal Vdrive is closed completely, reach higher power with this and save and dynamic contrast.
In sum, can learn that the projection display equipment shown in content of the present invention and its driving method reduce the power consumption of projection display equipment by the signal averaging amplitude reduced or close light source drive signal by above-mentioned various embodiments, and the background luminance in during dark-state be reduced the effect to add overall dynamic contrast simultaneously.
Although the present invention discloses as above with embodiment; so itself and be not used to limit the present invention, be anyly familiar with this those skilled in the art, without departing from the spirit and scope of the present invention; when being used for a variety of modifications and variations, therefore protection scope of the present invention is when being as the criterion depending on the accompanying claim person of defining.
Claims (15)
1. a projection display equipment, comprises:
One image processing module, in order to receive an image data and to produce a display, during wherein this display comprises an image with a dark-state during; And
One light source drive, in order to produce a light source drive signal to drive a projection light source, wherein this light source drive signal during this dark-state in there is one first section and one second section, and this light source drive signal at the signal averaging amplitude of this second section lower than the signal averaging amplitude in this light source drive signal is during this image.
2. projection display equipment as claimed in claim 1, wherein this light source drive signal is greater than the signal averaging amplitude of this light source drive signal in the signal averaging amplitude of this second section and this light source drive signal are during this image at the signal averaging amplitude of this first section.
3. projection display equipment as claimed in claim 2, wherein when this light source drive signal is in positive half cycle, this light source drive signal at the current level of this first section higher than the current level of this light source drive signal at this second section.
4. projection display equipment as claimed in claim 2, wherein when this light source drive signal is in negative half period, this light source drive signal at the current level of this second section higher than the current level of this light source drive signal at this first section.
5. the projection display equipment as described in claim 2,3 or 4, wherein this light source drive signal the signal averaging amplitude of this second section be approximately this light source drive signal during this image in signal averaging amplitude 30%.
6. projection display equipment as claimed in claim 1, wherein this light source drive signal this first and the signal averaging amplitude of this second section be zero.
7. projection display equipment as claimed in claim 6, wherein this light source drive also comprises:
One brightness control module, in order to according to a current controling signal and a dimming control signal to produce a dim signal; And
One light-adjusting module, in order to adjust the brightness of this projection light source according to this dim signal.
8. projection display equipment as claimed in claim 7, wherein this projection display equipment also comprises a microcontroller, in order to receive this current controling signal and this dim signal from an input interface.
9. a projection display equipment, comprises:
One image process unit;
One display unit, is electrically connected this image process unit, in order to produce a signal of video signal, during wherein this signal of video signal comprises an image with a dark-state during;
One microcontroller, is electrically connected this image process unit;
One light source drive, is electrically connected this microcontroller and this display unit; And
One projection light source, is electrically connected this light source drive, and in order to project this signal of video signal to one projection screen,
Wherein this light source drive is in order to produce a light source drive signal to drive this projection light source, and this light source drive signal has one first section and one second section during this dark-state, this light source drive signal the signal averaging amplitude of this second section be not more than this light source drive signal during this image in signal averaging amplitude.
10. a driving method, in order to drive a projection display equipment to show an image data, this driving method comprises:
Receive and adjust this image data, during making this image data have an image with a dark-state during; And
Adjust a light source drive signal of a projection light source of this projection display equipment, make this light source drive signal during this dark-state, have one first section and one second section, and this light source drive signal at the signal averaging amplitude of this second section lower than the signal averaging amplitude in this light source drive signal is during this image.
11. driving methods as claimed in claim 10, wherein also comprise in the step of a light source drive signal of a projection light source of this projection arrangement of adjustment:
This light source drive signal is set to be greater than the signal averaging amplitude of this light source drive signal in the signal averaging amplitude of this second section and this light source drive signal are during this image at the signal averaging amplitude of this first section.
12. driving methods as claimed in claim 11, wherein when this light source drive signal is in positive half cycle, are set to this light source drive signal higher than the current level of this light source drive signal at this second section at the current level of this first section.
13. driving methods as claimed in claim 11, wherein when this light source drive signal is in negative half period, are set to this light source drive signal higher than the current level of this light source drive signal at this first section at the current level of this second section.
14. driving methods as described in claim 11,12 or 13, wherein by this light source drive signal the signal averaging amplitude of this second section be set to this light source drive signal during this image in signal averaging amplitude 30%.
15. driving methods as claimed in claim 10, wherein also comprise in the step of a light source drive signal of a projection light source of this projection arrangement of adjustment:
By this light source drive signal this first and the signal averaging amplitude of this second section be set to zero.
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| CN201310410674.4A CN104424877B (en) | 2013-09-10 | 2013-09-10 | Projection display equipment and driving method |
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| CN201310410674.4A CN104424877B (en) | 2013-09-10 | 2013-09-10 | Projection display equipment and driving method |
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| US20050007389A1 (en) * | 2002-03-28 | 2005-01-13 | Yasuhiro Kumamoto | Liquid crystal display |
| US20050195148A1 (en) * | 2004-02-12 | 2005-09-08 | Seiko Epson Corporation | Electro-optical device, driving method of electro-optical device, driving circuit of electro-optical device and electronic apparatus |
| US20060092117A1 (en) * | 2004-10-29 | 2006-05-04 | Daisuke Kubota | Liquid crystal display device and method for driving the same |
| US20070229447A1 (en) * | 2006-03-23 | 2007-10-04 | Toshiba Matsushita Display Technology Co., Ltd. | Liquid crystal display device |
| US20090237347A1 (en) * | 2006-03-22 | 2009-09-24 | Fujifilm Corporation | Liquid crystal display and method of displaying thereof |
| CN101998738A (en) * | 2009-08-19 | 2011-03-30 | 优志旺电机株式会社 | High pressure discharge lamp lighting device and projector |
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| US20050007389A1 (en) * | 2002-03-28 | 2005-01-13 | Yasuhiro Kumamoto | Liquid crystal display |
| US20050195148A1 (en) * | 2004-02-12 | 2005-09-08 | Seiko Epson Corporation | Electro-optical device, driving method of electro-optical device, driving circuit of electro-optical device and electronic apparatus |
| US20060092117A1 (en) * | 2004-10-29 | 2006-05-04 | Daisuke Kubota | Liquid crystal display device and method for driving the same |
| US20090237347A1 (en) * | 2006-03-22 | 2009-09-24 | Fujifilm Corporation | Liquid crystal display and method of displaying thereof |
| US20070229447A1 (en) * | 2006-03-23 | 2007-10-04 | Toshiba Matsushita Display Technology Co., Ltd. | Liquid crystal display device |
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