CN101363966A - Method for overcoming laser modulation power waviness - Google Patents
Method for overcoming laser modulation power waviness Download PDFInfo
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- CN101363966A CN101363966A CNA2008100717926A CN200810071792A CN101363966A CN 101363966 A CN101363966 A CN 101363966A CN A2008100717926 A CNA2008100717926 A CN A2008100717926A CN 200810071792 A CN200810071792 A CN 200810071792A CN 101363966 A CN101363966 A CN 101363966A
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Abstract
The invention relates to the technical field of laser display, in particular to a laser modulation power wave overcoming method in the field. The method comprises the following steps: an auxiliary high-frequency modulation signal is overlapped on a main modulation waveform; furthermore, the frequency of the auxiliary high-frequency modulation signal exceeds the frequency of an eye responsive high-frequency signal; the auxiliary high-frequency modulation signal can be a square wave, a sine wave, a triangle wave or an irregular noise signal; and the auxiliary high-frequency modulation signal is indirectly overlapped through the drive of a circuit, or is directly overlapped through the laser. The method overcomes the laser modulation power wave influence on the laser display, eliminates the influence of the produced dark spots or dark lines of display pictures, and improves the contrast ratio and the color effect of the laser display.
Description
Technical field
The present invention relates to the laser display technology field, relate in particular to a kind of method that overcomes laser modulation power waviness in this field.
Background technology
Along with the development and the growth in the living standard of Science and Technology, people improve day by day to the requirement that colour shows, the demonstration field attracts increasing eyeball.It is rapid that colour is presented at development in recent years, and wherein liquid crystal, LED, laser display technology all have important breakthrough.Laser display is because it has color saturation height (image color is more bright-coloured), big colour gamut (image color is abundanter), high strength, high brightness (can realize giant-screen), good directionality, high-resolution advantages such as (image are more clear), therefore more and more being subjected to industry pays close attention to, but still there are several technical obstacles, influence the development process of laser display, the modulation power waviness problem is exactly one of them.
The laser display of main flow mostly needs LASER Light Source is modulated at present, utilizes modulation signal and three coloured light to produce gorgeous display frame.Yet in the modulated process of some laser instruments, ripple can appear in modulation power, as shown in Figure 1.When scanning, this can cause display frame to produce blackening or concealed wire, reduces the contrast and the color effect of laser display.
Summary of the invention
For addressing the above problem, the present invention proposes a kind of in order to overcome the method for laser modulation power waviness.
Method of the present invention is:
The inferior high-frequency modulation signal of stack on main modulation waveform.
Further, the frequency of described time high-frequency modulation signal surpasses the frequency of the high-frequency signal of human eye response.
Further, the frequency of described time high-frequency modulation signal surpasses 25Hz at least.
Recited above time high-frequency modulation signal is square wave, sine wave, triangular wave or irregular noise signal.
Described time high-frequency modulation signal is superposeed indirectly or directly laser is superposeed by drives.
Method of the present invention has overcome the influence of laser modulation power waviness to laser display, has eliminated display frame and has produced blackening or concealed wire influence, has improved the contrast and the color effect of laser display.
Description of drawings
Fig. 1 is the oscillogram of laser modulation power waviness;
Fig. 2 is the oscillogram of first embodiment of the present invention;
Fig. 3 is the waveform isoboles of first embodiment of the present invention;
Fig. 4 is the oscillogram of second embodiment of the present invention;
Fig. 5 is the waveform isoboles of second embodiment of the present invention.
Embodiment
The present invention is further described for existing accompanying drawings.
As shown in Figure 1, modulation power waviness is a kind of power swing, and its performance characteristic is exactly to depart from a kind of power that the laser modulation output signal occurs.
Shown in the waveform of Fig. 2, invention of the present invention is the inferior high-frequency modulation signal of stack on main modulation waveform, and the power swing of modulation waveform is submerged in the high-frequency signal.Like this, the contrast of laser display and color effect can not reduce in human eye response, and its equivalent oscillogram as shown in Figure 3.
Further, the frequency of described time high-frequency modulation signal surpasses the frequency of the high-frequency signal of human eye response.It is obvious more to the influence of laser display that high more inferior high-frequency modulation signal frequency has overcome laser modulation power waviness.But the frequency of this signal also must be the frequency that laser instrument can respond.Be the obvious flicker of avoiding human eye to discern, the frequency of described time high-frequency modulation signal surpasses 25Hz at least.
As shown in Figure 4, when the light-intensity variation owing to other reason modulation waveform can not be submerged in the high-frequency signal fully, select suitable modulation signal again, still can in the response of human eye, obtain good display, the equivalent oscillogram of waveform as shown in Figure 5 for improving.
Recited above time high-frequency modulation signal is square wave, sine wave, triangular wave or irregular noise signal.
Described time high-frequency modulation signal is superposeed indirectly or directly laser is superposeed by drives.
Laser works is in permanent power or constant current mode, and homophony system signal is pump-coupling LD modulation, and homophony system signal can be square wave, sine wave, triangular wave etc., and homophony system signal can have different dutycycles.
Method of the present invention has overcome the influence of laser modulation power waviness to laser display, has eliminated display frame and has produced blackening or concealed wire influence, has improved the contrast and the color effect of laser display.
Although specifically show and introduced the present invention in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present invention that do not break away from appended claims and limited; can make various variations to the present invention in the form and details, be protection scope of the present invention.
Claims (6)
1. a method that overcomes laser modulation power waviness is characterized in that: the inferior high-frequency modulation signal of stack on main modulation waveform.
2. the method that overcomes laser modulation power waviness as claimed in claim 1 is characterized in that: the frequency of described time high-frequency modulation signal surpasses the frequency of the high-frequency signal of human eye response.
3. the method that overcomes laser modulation power waviness as claimed in claim 2 is characterized in that: the frequency of described time high-frequency modulation signal is at least 25Hz.
4. the method that overcomes laser modulation power waviness as claimed in claim 1 is characterized in that: described time high-frequency modulation signal is square wave, sine wave, triangular wave or irregular noise signal.
5. as claim 1,2, the 3 or 4 described methods that overcome laser modulation power waviness, it is characterized in that: described time high-frequency modulation signal is superposeed indirectly by drives.
6. as claim 1,2, the 3 or 4 described methods that overcome laser modulation power waviness, it is characterized in that: described time high-frequency modulation signal directly superposes to laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100717926A CN101363966A (en) | 2008-09-11 | 2008-09-11 | Method for overcoming laser modulation power waviness |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100717926A CN101363966A (en) | 2008-09-11 | 2008-09-11 | Method for overcoming laser modulation power waviness |
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| Publication Number | Publication Date |
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| CN101363966A true CN101363966A (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100717926A Pending CN101363966A (en) | 2008-09-11 | 2008-09-11 | Method for overcoming laser modulation power waviness |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103890829A (en) * | 2011-10-25 | 2014-06-25 | 索尼公司 | Laser drive circuit, method for driving laser, and device using laser light |
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2008
- 2008-09-11 CN CNA2008100717926A patent/CN101363966A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103890829A (en) * | 2011-10-25 | 2014-06-25 | 索尼公司 | Laser drive circuit, method for driving laser, and device using laser light |
| CN103890829B (en) * | 2011-10-25 | 2017-10-20 | 索尼公司 | Laser driving circuit, laser-driving method and the equipment using laser |
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Open date: 20090211 |