CN111131802A - DLP projector and dynamic color management system - Google Patents
DLP projector and dynamic color management system Download PDFInfo
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- CN111131802A CN111131802A CN202010020089.3A CN202010020089A CN111131802A CN 111131802 A CN111131802 A CN 111131802A CN 202010020089 A CN202010020089 A CN 202010020089A CN 111131802 A CN111131802 A CN 111131802A
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- light source
- light
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- image processor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Projection Apparatus (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention provides a DLP projector and a dynamic color management system, wherein the DLP projector comprises a light source, an image processor, an optical modulator, a light source driver and a projection lens; the image processor is used for receiving original image information and generating a corresponding modulation control signal; the image processor is also used for determining the corresponding peak color brightness according to the original image information and generating a corresponding power control signal according to the peak color brightness; an optical modulator for controlling the optical modulator according to a modulation control signal; and the projection lens is used for projecting the modulated image onto a screen. The DLP projector and the dynamic color management system provided by the invention can determine the peak color brightness corresponding to the image brightness according to the received original image information, and then control the light source drive according to the peak color brightness so as to control the output of the light source to just reach the peak color brightness, thereby not only meeting the requirement of correct color display, but also reducing the light source drive voltage, saving the energy and prolonging the service life of the light source.
Description
Technical Field
The invention relates to the technical field of projection, in particular to a DLP projector and a dynamic color management system.
Background
A projector, also called a projector, is a device that can project images or video onto a screen. With the advancement and breakthrough of technology, the mainstream projectors in the market have been occupied by conventional CRT three-gun type projectors, and gradually by DLP (digital light Processor) projectors. Compared with the traditional CRT projector, the DLP projector has the advantages of bright color, rich levels, high saturation and the like, is widely popular with consumers, and is widely applied to scenes such as life entertainment, academic lectures, business exhibition and the like.
In the design process of the DLP projector, dynamic color management, energy conservation, and light source life are key design indicators. In the prior art, the DLP projector, whether a gas discharge light source or a solid-state light source, adopts a method of increasing or decreasing the light beam output from the light source to the DMD array according to the estimated brightness of the screen image, and the decreased light beam is absorbed by the dynamic management system, which results in energy waste and does not improve the lifetime of the light source.
Disclosure of Invention
In view of the above, there is a need to provide a DLP projector and a dynamic color management system, which can reduce the light source output as much as possible on the basis of satisfying the brightest level color brightness required for image display, thereby satisfying the energy saving requirement and prolonging the light source life.
A dynamic color management system comprising an image processor, a light modulator and a light source driver; the image processor is used for receiving original image information and generating a corresponding modulation control signal for the optical modulator to perform signal modulation; the image processor is further used for determining corresponding peak color brightness according to the original image information and generating a corresponding power control signal according to the peak color brightness, so that the brightness output by the light source driver is controlled to just meet the peak color brightness required by image display; and the light modulator is used for carrying out signal modulation under the peak color brightness output by the light source according to the modulation control signal.
Preferably, the image processor analyzes the original image information according to a preset number of frames to determine the corresponding peak color brightness.
Preferably, the preset frame number is 1 frame.
Preferably, the image processor determines the corresponding peak color brightness in advance according to all frame data of the original image.
A DLP projector includes a light source, an image processor, a light modulator, a light source driver, and a projection lens; the image processor is used for receiving original image information and generating a corresponding modulation control signal for the optical modulator to perform signal modulation; the image processor is further used for determining corresponding peak color brightness according to the original image information and generating a corresponding power control signal according to the peak color brightness, so that the brightness output by the light source driver is controlled to just meet the peak color brightness required by image display; the light modulator is used for modulating signals under the peak color brightness output by the light source according to the modulation control signal; and the projection lens is used for projecting the modulated image onto a screen.
Preferably, the DLP projector further comprises a light splitting device and a light combining device; the light separation device is used for separating light emitted by the light source into three primary colors of light; the image processor comprises subunits which are used for respectively processing the three primary color signals of the image so as to generate the modulation control signals corresponding to the subunits; the light modulator correspondingly comprises subunits for respectively modulating the three primary colors of light so as to respectively modulate signals; and the optical combiner is used for combining the modulated three primary color signal light and outputting the combined light to the projection lens.
Preferably, the light source is a white light source or a multi-wavelength range light source.
Preferably, the light source includes a plurality of three primary color light sources; the light source drivers comprise three primary color light source drivers respectively corresponding to the three primary color light source drivers; and the image processor determines power control signals of the three-primary-color light source drivers corresponding to the image according to the three-primary-color signals of the image so as to respectively control the power control signals.
Preferably, the light source is a solid state light source.
Preferably, the solid-state light source is an LED light source or a laser light source.
The DLP projector and the dynamic color management system provided by the invention can determine the peak color brightness corresponding to the image brightness according to the received original image information, and then control the light source drive according to the peak color brightness so as to control the output of the light source to just reach the peak color brightness, thereby not only meeting the requirement of correct color display, but also reducing the light source drive voltage, saving the energy and prolonging the service life of the light source.
Drawings
FIG. 1 is a schematic circuit diagram of a dynamic color management system according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a dynamic color management system according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a DLP projector according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention belong to the protection scope of the present invention.
The DLP projector provided by the embodiment of the invention comprises a light source, a light separation device, an image processor, a light modulator, a light source driver, a light combination device, a projection lens and the like. The light separating assembly includes a condensing lens, a color wheel and a shaping lens for separating the light source into signal lights of three primary colors of red, green and blue. The light modulator respectively adjusts the light signals of three colors according to the image to be presented, and finally the light signals are transmitted to the screen by the projection lens.
The main functional element of the light modulator is the DMD array. The DMD array includes millions of individually adjustable micromirrors, each of which can be individually flipped at an angle, i.e., can be in an "on" or "off" state (e.g., an "on" state can be defined as a state in which light is reflected onto the screen, and an "off" state is a state in which the portion of the light signal is discarded). Further, an optical signal with an intermediate intensity between on and off can be obtained through a pulse width modulation technology, that is, an optical signal with different mean values can be obtained by turning on and off a certain micromirror at a certain frequency and controlling the relative time lengths of the on and off states.
The inventors have found that for most video and movie content, the average brightness level or average picture level is typically less than 50%. The peak pixel level may also be much lower on a frame-by-frame and color-by-color basis. Many scenes are very dark in nature, and no pixel requires a full brightness level, and therefore full power illumination for the correct display level.
To this end, the present invention provides a dynamic color management system comprising an image processor, a light modulator and a light source driver, as shown in fig. 1.
The image processor is used for receiving original image information and generating a corresponding modulation control signal for the optical modulator to perform signal modulation;
the image processor is further used for determining corresponding peak color brightness according to the original image information and generating a corresponding power control signal according to the peak color brightness, so that the brightness output by the light source driver is controlled to just meet the peak color brightness required by image display;
and the light modulator is used for carrying out signal modulation under the peak color brightness output by the light source according to the modulation control signal.
As mentioned above, the DLP projector, which has a complicated actual internal structure, will be described in more detail with reference to fig. 2.
The DLP projector preferably adopts solid-state light sources such as LEDs and lasers, and has the advantages of fast response and long service life. The light source can be in various forms, namely a white light source in the simplest form, and in some scenes such as a cinema, etc., a plurality of R, G, B light sources with three primary colors can also be used, and the number of the light sources is greatly different. When the light source is a white light source or a multi-wavelength range light source, the image processor 32 comprehensively determines a power control signal of the light source driver 36 according to the three primary color signals of the image to control the light source driver 36.
The light sources in fig. 2 are exemplified by multi-colored RGB light sources, and the corresponding driving thereof should also include driving of RGB colors, whereby the image processor 32 determines power control signals of the respective corresponding three-primary light source drivers 36 for respective control according to the three-primary signals of the image. After the light of the three primary colors is modulated, an image is projected onto the screen 28 by a light combining device, a projection lens, or the like.
The present embodiment provides three light modulators 12R, 12G, and 12B for modulating light from the three light sources 12R, 12G, and 12B, respectively. Each light source 14R, 14G, 14B may comprise a single light source or a plurality of light sources.
The image processor 32 may be, but is not limited to, a DSP, and has functions of data storage, analysis, and processing. The image processor 32 receives original image information (such as pictures, videos, etc., without limitation to format) to be presented, performs analysis processing, and generates a corresponding modulation control signal. Since the DLP projector is modulated according to R, G, B three primary colors, the modulation control signals to be generated here should also correspond to the color components for the three light modulators 12R, 12G, 12B to modulate, respectively.
The image processor 32 uses the frame peaks to generate power control signals for application to the light source driver 36, and in response the light source driver 36 adjusts the power applied to the three light sources 14R, 14G, 14B so that they emit just enough illumination to reach the frame peaks. For example, if the frame peaks indicate that only 50% red, 75% green, and 30% blue are needed, the illumination power of the light sources 14R, 14G, 14B is reduced to these levels (depending on the linearity of the illumination sources), and the projector recalibrates itself to the new relative intensity by adjusting the DMD control signal accordingly to compensate for the reduced laser output.
As shown in FIG. 3, in each light modulator 12R, 12G, and 12B, a lens 16 directs light into a light guide 18, and at the output of the light guide 18, another lens 20 directs light through an optical integrator 22 to a DMD array 24, each micromirror being selectively actuatable to modulate a light beam from an associated light source 14R, 14G, 14B. Projection lens 26 directs the modulated light to screen 28.
In terms of power consumption and device lifetime, the light sources 14R, 14G, 14B require less power since they are driven at less than full output. If the input power level of the projector can be reduced while maintaining the output power to allow the brightest pixels to be displayed at peak color or brightness, the light source lifetime can be significantly increased and the black level of the darkest scene is reduced, thereby increasing the observable contrast.
In terms of thermal management, since the light sources 14R, 14G, 14B only deliver the light that is actually needed, the heat loss is also reduced.
In summary, the DLP projector and the dynamic color management system provided in the embodiments of the present invention can determine the peak color brightness corresponding to the image brightness according to the received original image information, and then control the light source driving according to the peak color brightness to control the output of the light source to just reach the peak color brightness, so as to not only meet the requirement of correct color display, but also reduce the light source driving voltage, save energy, and improve the service life of the light source.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A dynamic color management system comprising an image processor, a light modulator, and a light source driver;
the image processor is used for receiving original image information and generating a corresponding modulation control signal for the optical modulator to perform signal modulation;
the image processor is further used for determining corresponding peak color brightness according to the original image information and generating a corresponding power control signal according to the peak color brightness, so that the brightness output by the light source driver is controlled to just meet the peak color brightness required by image display;
and the light modulator is used for carrying out signal modulation under the peak color brightness output by the light source according to the modulation control signal.
2. The dynamic color management system of claim 1, wherein the image processor analyzes the raw image information based on a predetermined number of frames to determine a corresponding peak color intensity.
3. The dynamic color management system of claim 2, wherein the preset number of frames is 1 frame.
4. The dynamic color management system of claim 1, wherein the image processor determines the corresponding peak color brightness in advance from all frame data of the original image.
5. A DLP projector is characterized by comprising a light source, an image processor, a light modulator, a light source driver and a projection lens;
the image processor is used for receiving original image information and generating a corresponding modulation control signal for the optical modulator to perform signal modulation;
the image processor is further used for determining corresponding peak color brightness according to the original image information and generating a corresponding power control signal according to the peak color brightness, so that the brightness output by the light source driver is controlled to just meet the peak color brightness required by image display;
the light modulator is used for modulating signals under the peak color brightness output by the light source according to the modulation control signal;
and the projection lens is used for projecting the modulated image onto a screen.
6. The DLP projector as claimed in claim 5 further comprising a light splitting device and a light combining device;
the light separation device is used for separating light emitted by the light source into three primary colors of light;
the image processor comprises subunits which are used for respectively processing the three primary color signals of the image so as to generate the modulation control signals corresponding to the subunits;
the light modulator correspondingly comprises subunits for respectively modulating the three primary colors of light so as to respectively modulate signals;
and the optical combiner is used for combining the modulated three primary color signal light and outputting the combined light to the projection lens.
7. The DLP projector as claimed in claim 6, wherein said light source is embodied as a white light source or a multi-wavelength range light source.
8. The DLP projector as claimed in claim 6 wherein said light source comprises a plurality of three primary color light sources; the light source drivers comprise three primary color light source drivers respectively corresponding to the three primary color light source drivers;
and the image processor determines power control signals of the three-primary-color light source drivers corresponding to the image according to the three-primary-color signals of the image so as to respectively control the power control signals.
9. The DLP projector as claimed in claim 7 or 8 wherein said light source is a solid state light source.
10. The DLP projector of claim 9 wherein said solid state light source is an LED light source or a laser light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010020089.3A CN111131802A (en) | 2020-01-09 | 2020-01-09 | DLP projector and dynamic color management system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010020089.3A CN111131802A (en) | 2020-01-09 | 2020-01-09 | DLP projector and dynamic color management system |
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| CN111131802A true CN111131802A (en) | 2020-05-08 |
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| CN202010020089.3A Pending CN111131802A (en) | 2020-01-09 | 2020-01-09 | DLP projector and dynamic color management system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114079761A (en) * | 2020-08-21 | 2022-02-22 | 深圳市环球数码科技有限公司 | Integrated movie player and DLP projection equipment that accord with DCI standard |
| CN114403650A (en) * | 2022-01-21 | 2022-04-29 | 南京投石智能系统有限公司 | Control system for holographic display cabinet |
-
2020
- 2020-01-09 CN CN202010020089.3A patent/CN111131802A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114079761A (en) * | 2020-08-21 | 2022-02-22 | 深圳市环球数码科技有限公司 | Integrated movie player and DLP projection equipment that accord with DCI standard |
| CN114079761B (en) * | 2020-08-21 | 2024-05-17 | 深圳市环球数码科技有限公司 | Integrated movie player and DLP projection device conforming to DCI standard |
| CN114403650A (en) * | 2022-01-21 | 2022-04-29 | 南京投石智能系统有限公司 | Control system for holographic display cabinet |
| CN114403650B (en) * | 2022-01-21 | 2022-11-01 | 南京投石智能系统有限公司 | Control system for holographic display cabinet |
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