CN107888891B - Image projection display method and optical engine - Google Patents
Image projection display method and optical engine Download PDFInfo
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- CN107888891B CN107888891B CN201610874762.3A CN201610874762A CN107888891B CN 107888891 B CN107888891 B CN 107888891B CN 201610874762 A CN201610874762 A CN 201610874762A CN 107888891 B CN107888891 B CN 107888891B
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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]
- H04N9/3197—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using light modulating optical valves
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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
- H04N9/3152—Modulator illumination systems for shaping the light beam
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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
- H04N9/3155—Modulator illumination systems for controlling the light source
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Abstract
The present disclosure discloses an image projection display method and an optical engine. The method comprises the following steps: the method comprises the steps of obtaining image data of an image to be projected and displayed, partitioning the image to be projected and displayed according to the brightness data, wherein the partitions have different brightness levels, adjusting luminous flux of each area, corresponding to each partition in the image to be projected and displayed, in a luminous flux control element according to the brightness level corresponding to each partition, projecting an adjusted light beam to the surface of a DMD light valve by the luminous flux control element, modulating the light beam according to an image display driving signal of the image to be projected and displayed, and projecting the light beam into a projection lens for imaging and displaying. The image projection display method can automatically control the brightness distribution of the projection display image according to the brightness level of each subarea of the image to be projected and displayed, so that the contrast of the projection display image is adjusted, and in addition, an optical engine is also provided.
Description
Technical Field
The present disclosure relates to the field of projection display, and in particular, to an image projection display method and an optical engine.
Background
Optical engines are becoming more popular as an important computer graphic image output device in teaching, demonstration, entertainment, work, and the like. A DLP (Digital Light Processing) optical engine is an optical engine using a special Light source modulation method, and because of using a full Digital reflection method, the DLP optical engine not only can make a projection display image finer, but also can effectively reduce the volume and weight of the optical engine, thereby being widely used.
In the DLP optical engine, a DMD (Digital Micromirror Device) light valve is used as a main component to implement the Digital optical processing. White light emitted by the light source is converged on a color wheel disc formed by red, green and blue colors after passing through a condenser lens to generate time-sequential output of red, green and blue monochromatic light, and the output is converted into parallel light through a lens and then is irradiated on a DMD light valve. The DMD light valve-is controlled by the image display driving signal to make thousands of micro-mirrors on it switch back and forth between the "on" or "off" positions, respectively. The micro-mirror in the "on" position will reflect light into the lens, correspondingly creating a bright spot on the projection screen; and those in the "off" position will cause light to be reflected off the lens and absorbed as stray light, correspondingly creating a dark spot on the projection screen. Therefore, the light quantity entering the lens is determined by the overturning angle and the overturning time length of each micro-reflector, and a complete projection display image is formed on the projection screen through the lens after being reflected by all the micro-reflectors on the whole DMD chip.
Fig. 1 is a schematic view illustrating light deflection and projection conditions of two minute mirror plate units according to an exemplary embodiment. After the light emitted from the light source 101 is processed and then irradiated onto the DMD chip, the micromirrors 108 and 109 are turned over in response under the control of image data, and the light reflected by the micromirror 109 enters the lens 104, and the light reflected by the micromirror 108 is projected outside the lens and absorbed as stray light by the light absorption unit 107.
In the DLP optical engine at present, because light has diffuse reflection in the reflection process, the light reflected by a micro reflector in a DMD chip can not be projected into a lens completely, and the brightness of a bright part in a projection display image is reduced, so that the ratio of the brightness at the brightest to the brightness at the darkest is reduced, even if the contrast of the projection display image is poor.
Disclosure of Invention
In order to solve the technical problem that the contrast of a projection display image of a DLP optical engine is poor in the related art, the disclosure provides an image projection display method and an optical engine.
An image projection display method comprising:
acquiring image data of a display image to be projected;
partitioning the image to be projected and displayed according to the image data, wherein each partition has a corresponding brightness level;
adjusting the luminous flux of each region in the luminous flux control element corresponding to each partition in the image to be projected and displayed respectively according to the brightness level corresponding to each partition, wherein the luminous flux of the regions in the luminous flux control element corresponding to the partitions with different brightness levels is different in adjustment amplitude;
the light flux control element projects the adjusted light beam to the surface of a DMD light valve, and the DMD light valve modulates the light beam according to the image display driving signal of the image to be projected and displayed and projects the light beam into a projection lens for imaging and displaying.
An optical engine, comprising, according to a beam transmission direction:
the illumination light path is used for receiving and homogenizing the light beam emitted by the projection light source;
the luminous flux control element is used for receiving the light beams emitted by the illumination light path and adjusting the luminous flux of the light beams in regions according to the regions determined in the image to be projected and displayed, wherein the regions with different brightness levels have different luminous flux adjustment amplitudes in the regions corresponding to the luminous flux control element;
the DMD light valve is used for receiving the light beam adjusted by the luminous flux control element, modulating the light beam projected to the surface of the DMD light valve according to the image display driving signal of the image to be projected and displayed, and inputting the light beam into a projection lens for imaging and displaying;
the optical engine further comprises a control chip, wherein the control chip is used for acquiring image data of a to-be-projected display image, partitioning the to-be-projected display image according to the image data, and the partition determined in the to-be-projected display image corresponds to the partition area of the luminous flux control element.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the method comprises the steps of obtaining image data of an image to be projected and displayed, partitioning the image to be projected and displayed according to the image data, wherein the partitions have different brightness levels, adjusting luminous flux of each area, corresponding to each partition in the image to be projected and displayed, in a luminous flux control element according to the brightness level corresponding to each partition, wherein the luminous flux of the areas, corresponding to the partitions, in the luminous flux control element of the partitions with different brightness levels is different in luminous flux adjustment amount, the luminous flux control element projects an adjusted light beam to the surface of a DMD light valve, and the DMD light valve modulates the light beam according to an image display driving signal of the image to be projected and displayed, and projects the light beam into a projection lens for imaging and displaying. The light flux control element is added in the optical engine, the adjustment amplitude of the light flux of each area in the light flux control element corresponding to each subarea of the image is different according to the different brightness levels of each subarea in the image to be projected and displayed, and the DMD light valve still adjusts the light beam controlled by the light flux according to the image display driving signal of the image to be projected and displayed, so that the brightness distribution of the generated projection display image is changed compared with the image to be projected and displayed, and the contrast of the projection display image is adjusted.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram illustrating the light deflection and projection of two tiny mirror plate units according to an exemplary embodiment;
FIG. 2 is a schematic illustration of an implementation environment according to the present disclosure;
FIG. 3 is a flow chart illustrating a method of image projection display according to an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating signal processing by a DLP optical engine in accordance with an exemplary embodiment;
FIG. 5 is a flowchart of the step of partitioning the image to be projected for display according to the image data, the partitions having different brightness levels, according to the corresponding embodiment of FIG. 3;
FIG. 6 is a schematic diagram illustrating a display image to be projected being equally divided into 16 partitions according to location information of each pixel according to an exemplary embodiment;
FIG. 7 is a flowchart of the partition step of determining the partition corresponding to the brightness level in the image to be projected for display according to the brightness information and the pixel position information of each pixel in the corresponding embodiment of FIG. 6;
FIG. 8 is a flowchart of the step of adjusting the luminous flux of the respective areas of the luminous flux control element corresponding to the respective sub-areas of the image to be projected according to the brightness levels corresponding to the respective sub-areas in the embodiment of FIG. 3;
FIG. 9 is a flowchart of the step of adjusting the luminous fluxes of the respective areas of the luminous flux control element corresponding to the respective partitions of the image to be projected and displayed according to the luminance levels corresponding to the respective partitions in the embodiment corresponding to FIG. 3 in another embodiment;
FIG. 10 is a block diagram illustrating an image projection arrangement according to an exemplary embodiment;
FIG. 11 is a block diagram of an image partitioning module shown in a corresponding embodiment of FIG. 10;
FIG. 12 is a block diagram of an image partition module shown in a corresponding embodiment of FIG. 10 in another embodiment;
fig. 13 is a block diagram of a light flux control module shown in the corresponding embodiment of fig. 10;
fig. 14 is a block diagram of a light flux control module shown in the corresponding embodiment of fig. 10 in another embodiment;
fig. 15 is a block diagram illustrating a configuration of an optical engine according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
FIG. 2 is a schematic illustration of an implementation environment according to the present disclosure. As shown in fig. 2, the implementation environment includes: an optical engine 100 and a video signal output terminal 200. The video signal output terminal 200 is in data communication connection with the optical engine 100, the video signal output terminal 200 transmits a video signal to the optical engine 100, the optical engine 100 receives the video signal, processes the video signal to generate image data, and projects a projection display image related to the video signal according to the image data.
Example one
Fig. 3 is a flowchart illustrating an image projection display method according to an exemplary embodiment. As shown in fig. 3, the image projection display method may include the following steps.
In step S110, image data of a display image to be projected is acquired.
In the using process of the optical engine, a computer or other video signal output terminal converts display data into a video signal, the video signal is sent to the optical engine through the connection of the optical engine and the video signal output terminal, and after the optical engine receives the video signal output by the video signal output terminal, the video signal is processed to generate image data of an image to be projected and displayed.
FIG. 4 is a schematic diagram illustrating signal processing by a DLP optical engine in accordance with an exemplary embodiment. Light emitted by the light source 101 is subjected to light processing by the optical system 102 and projected into the DMD light valve 103, and the video signal is processed by the multimedia data processing module to generate image data of an image to be projected and displayed, where the image data includes an image display driving signal of the image to be projected and displayed, and the DMD light valve 103 is controlled by the light modulation driving 106 under the control of the image display driving signal. So that the DMD light valve 103 processes the light and displays the processed light through the lens 104.
In step S120, the image to be projected and displayed is partitioned according to the image data, and the partitions have different brightness levels.
The image data includes information such as luminance information and positional information of each pixel and an image display drive signal.
The specific implementation of the partition of the image to be projected and displayed may be to partition according to the position information of each pixel in the image data, or partition according to the brightness information and the position information of each pixel, or partition by using other information in the image data, which is not listed here.
After the image to be projected and displayed is partitioned, each partition corresponds to a brightness level according to the brightness of each partition, and the brightness levels of the partitions can be the same or different.
In step S130, the luminous fluxes of the regions of the luminous flux control element respectively corresponding to the regions of the image to be projected and displayed are adjusted according to the brightness levels corresponding to the regions, wherein the regions of different brightness levels have different luminous flux adjustment ranges.
A luminous flux control element is provided in a light path of light of the optical engine, and the luminous flux control element is an optical switch for controlling luminous flux of the light beam. The light beam propagates through the light flux controlling element, thereby controlling the brightness of the light beam in the optical engine by the light flux controlling element. The light beam in the optical engine is transmitted straight forward in a certain coverage area, and due to the straight transmission of the light rays of the light beam in the optical engine, each area in the luminous flux control element is in one-to-one correspondence with each part in the projection display image. Thus varying the luminous flux to different areas in the luminous flux control element, the brightness of the corresponding part of the projected display image is varied.
According to the brightness levels corresponding to the partitions of the image to be projected and displayed in the image data, the areas corresponding to the partitions are determined in the luminous flux control element, and then the luminous flux of each corresponding area in the luminous flux control element is controlled, so that the luminous flux of each area in the luminous flux control element is different according to the different brightness levels of the corresponding partitions in the image to be projected and displayed.
In step S140, the light flux control element projects the adjusted light beam onto the surface of the DMD light valve, and the DMD light valve modulates the light beam according to the image display driving signal of the image to be projected and displayed, and projects the modulated light beam into the projection lens for image display.
The DMD light valve is a micro-electromechanical system with electronic input and optical output, and consists of a plurality of micro-reflectors which are independently controlled. The image data of the image to be projected and displayed comprises an image display driving signal, and the DMD light valve is controlled by the image display driving signal to make the micro-mirrors on the DMD light valve switch back and forth between the on positions or the off positions respectively. The micro-mirror in the "on" position will reflect the light beam into the lens, correspondingly creating a bright spot on the projection screen; and those in the "off" position will cause the beam to reflect off the lens, being absorbed as stray light, and correspondingly creating a dark spot on the projection screen. Therefore, the light quantity entering the lens is determined by the overturning angle and the overturning time length of each micro-reflector, and after being reflected by all the micro-reflectors on the whole DMD light valve, the light is imaged and displayed through the projection lens to form a complete projection display image on the projection screen.
And the DMD light valve performs optical processing on the light according to the display driving signal of the image to be projected and displayed, so that the projected and displayed image generated by projection is consistent with the image to be projected and displayed. And the brightness of the corresponding different parts in the projected display image is controlled by the luminous flux of the respective areas in the luminous flux control element.
The contrast ratio is the ratio of the brightness of the projection display image when the image is full white brightness to the brightness of the projection display image when the image is full black brightness, so that the reduction range of the brightness of the corresponding part of the projection display image is inconsistent by controlling the luminous flux of each area of the luminous flux control element, and the contrast ratio of the projection display image is adjusted.
The shapes of the subareas of the luminous flux control element and the DMD light valve are the same as the shape of the subarea of the image to be projected and displayed, but the areas of the subareas are in a certain proportional relation. Due to the linear propagation of the light, each position of the luminous flux control element is in one-to-one correspondence with a position on the DMD light valve through the propagation of the light, and each position on the DMD light valve is also in one-to-one correspondence with a position on the projected display image. After the image to be projected and displayed is partitioned, each area of the luminous flux control element is correspondingly controlled according to the partition, and then the luminous flux control element is projected onto the DMD light valve, so that the partition shape of the luminous flux control element and the partition shape of the DMD light valve are the same as the partition shape of the image to be projected and displayed.
By the method, the light flux control element is additionally arranged in the DLP optical engine, the brightness level of each subarea in the image is obtained according to the image data, the light flux of each corresponding area in the light flux control element is controlled, the adjustment amplitude of the brightness of each part of the projection display image generated under the control of the image display driving signal is different, and the DMD light valve adjusts the light beam controlled by the light flux according to the image display driving signal of the image to be projected, so that the brightness distribution of the generated projection display image is changed compared with the image to be projected, and the contrast of the image is adjusted.
Example two
Fig. 5 is a description of details of step S120 shown according to an example embodiment. In step S120, the step S120 may include the following steps.
In step S121, luminance information and pixel position information of each pixel in the image data are extracted.
A pixel is a basic unit of an image, which is composed of pixels. The image data includes information such as luminance information and positional information of each pixel and an image display drive signal, and the luminance information and the pixel positional information of each pixel are extracted from the image data.
In step S122, a partition corresponding to the brightness level in the display image to be projected is determined according to the brightness information and the pixel position information of each pixel.
There are various ways of determining the partition corresponding to the brightness level in the display image to be projected according to the brightness information and the pixel position information of each pixel.
And determining the brightness level corresponding to each pixel according to the brightness information of each pixel, and further determining the subareas with adjacent positions and the same brightness level as the subarea with one brightness level according to the position information of each pixel. Thus, the areas of the respective partitions may be the same or different.
Or dividing the image to be projected into a plurality of partitions according to the position information of each pixel, and calculating the brightness of each partition according to the brightness information of all the pixels in each partition, thereby determining the brightness level of each partition.
Fig. 6 is a schematic diagram illustrating a case where a display image to be projected is equally divided into 16 partitions according to position information of each pixel according to an exemplary embodiment. In fig. 6, according to the relative position of each pixel in the image to be projected, the image to be projected is equally divided into 16 partitions according to the area size, then the brightness of the 16 partitions is obtained, the brightness level of each partition is determined, and then the corresponding area in the light flux control element is controlled according to the brightness level of each partition, so that the brightness of each part of the generated projected display image is effectively controlled.
The partition mode corresponding to the brightness level in the image to be projected and displayed may also be determined according to other modes, which are not limited herein.
By the method, the brightness information and the pixel position information of each pixel in the image to be projected are obtained, the subarea corresponding to the brightness level in the image to be projected is determined, the luminous flux of each corresponding area in the luminous flux control element is controlled according to the brightness level, the brightness distribution of the projected image is changed, and the contrast of the image is adjusted.
EXAMPLE III
Fig. 7 is a description of details of step S122 shown according to an example embodiment. In step S122, the step S122 may include the following steps.
In step S1221, the luminance level present in the display image to be projected is determined from the luminance information of each pixel.
And dividing the brightness value into a plurality of brightness size ranges according to the brightness information of each pixel, wherein each brightness size range corresponds to one brightness level.
The method for determining the brightness level in the image to be projected includes various ways, and may be that a plurality of brightness levels are preset in the optical engine according to the brightness value, and further the brightness level in the image to be projected is determined according to the brightness information of each pixel in the image to be projected; the brightness grade of each pixel in the image to be projected and displayed can be divided according to a preset standard, so that the brightness grade existing in the image to be projected and displayed is determined; the brightness level present in the image to be projected may also be determined in other ways, which are not limited herein,
For example, assuming that the brightness is 100 at maximum, the optical engine classifies the brightness of 0 to 100 into 5 brightness levels of A [0, 20 ], B [20, 40), C [40, 60 ], D [60, 80), E [80, 100 ]. The brightness values of all pixels in the display image to be projected are between 10 and 70, and thus the brightness levels present in the display image to be projected are determined to be brightness levels A [0, 20 ], B [20, 40 ], C [40, 60), D [60, 80 ].
For another example, in the to-be-projected display image, the brightness values of all pixels are between 10 and 70, and the brightness values are divided into 3 brightness levels of a [10, 30 ], B [30, 50 ], and C [50, 70] according to a preset standard, and then the brightness levels existing in the to-be-projected display image are determined to be the brightness levels of a [10, 30 ], B [30, 50 ], and C [50, 70 ].
In step S1222, the corresponding partition of each brightness level in the display image to be projected is determined according to the brightness information and the pixel position information of each pixel.
And searching the brightness level corresponding to each pixel according to the brightness information of each pixel. According to the position information of each pixel, pixels which correspond to the same brightness level and are adjacent in position are determined as a partition, and a plurality of partitions of which the brightness corresponds to the same brightness level are determined as corresponding partitions of the brightness level in the image to be projected and displayed.
For example, the brightness levels of A, B, C and A, B, C are respectively A [0, 20 ], B [20, 40 ], and C [40, 70] in the image to be projected and displayed. When the luminances of three sequentially adjacent pixels X1, X2, X3 are 30, 35, 50, respectively, since the luminances of pixels X1, X2 are in B [20, 40) and the luminance of pixel X3 is in C [40, 70), the pixels X1, X2 are determined as one partition of the luminance level B.
By using the method, the existing brightness level is determined according to the brightness information of each pixel in the image to be projected and displayed, the image to be projected and displayed is partitioned according to the brightness level and the position information of each pixel, and the partition is more matched with the brightness and the position of each pixel, so that the luminous flux of the luminous flux control element is more targeted when being adjusted according to the partition, and the brightness distribution distortion of the picture is avoided.
Example four
Fig. 8 is a description of details of step S130 shown according to an example embodiment. The brightness levels corresponding to the partitions of the image to be projected and displayed are a high brightness level and a low brightness level, and in step S130, the step S130 may include the following steps.
In step S131, the partition corresponding to the low luminance level is determined based on the luminance level corresponding to each partition.
Two brightness levels exist in the image to be projected and displayed, wherein the two brightness levels are a high brightness level and a low brightness level respectively. And determining the corresponding subarea of the low brightness grade in the image to be projected and displayed according to the brightness grade corresponding to each subarea.
For example, the image to be projected and displayed has 4 segments F1, F2, F3, and F4, the luminance levels are a luminance level a and a luminance level B, respectively, the luminance level a being a high luminance level, and the luminance level B being a low luminance level. The luminance levels corresponding to the divisional areas F1, F2, F3 are all the luminance levels a, and the luminance level corresponding to the divisional area F4 is the luminance level B, whereby the divisional area corresponding to the low luminance level can be determined as the divisional area F4.
In step S132, it is determined that the division corresponding to the low luminance level is in the corresponding region of the light flux control element, and the light flux of the corresponding region is reduced.
Each position of the luminous flux control element is in one-to-one correspondence with a position in the display image to be projected, so that for each section in the display image to be projected, a specific area in the luminous flux control element corresponds to it. And determining areas corresponding to the subareas in the light flux control element according to the subareas corresponding to the low brightness grades in the image to be projected and displayed, and further reducing the light flux of the areas corresponding to the low brightness grade subareas by controlling the light flux control element.
By using the method, the areas corresponding to the low-brightness-level subareas in the luminous flux control element are determined according to the brightness levels corresponding to the subareas in the image to be projected and displayed, so that the luminous flux of the areas is reduced, the brightness of the originally darker area in the image to be projected and displayed is reduced, and the contrast of the projected and displayed image is improved.
EXAMPLE five
Fig. 9 is a description of details of step S130 shown according to an example embodiment. The brightness levels corresponding to the partitions of the image to be projected and displayed are a plurality of brightness levels, and in step S130, the step S130 may include the following steps.
In step S134, determining a low-region luminance level and a partition corresponding to the low-region luminance level according to the luminance level corresponding to each partition;
the brightness levels corresponding to the partitions of the image to be projected and displayed are a plurality of brightness levels, and the brightness levels in the low-region brightness levels are determined according to the preset standard according to the high-low sequence of the brightness levels.
The preset criterion may be a brightness level below which a low-region brightness level is determined; the preset standard can also exclude the highest brightness grade according to the high-low sequence of each brightness grade, and determine the brightness grade lower than the highest brightness grade as the low-region brightness grade; the low region brightness level may also be determined by other criteria.
For example, the number of luminance levels corresponding to the partition of the image to be projected is 4, and the luminance level a, the luminance level B, the luminance level C, and the luminance level D are determined in the order of the luminance level, and the luminance level lower than the luminance level B is determined as the low-region luminance level, and therefore, the luminance level C, D is determined as the low-region luminance level.
For another example, the number of luminance levels corresponding to the partition of the image to be projected is 4, and the luminance levels are the luminance level a, the luminance level B, the luminance level C, and the luminance level D in the order of the luminance levels, and the luminance level B, C, D is confirmed to be the low-partition luminance level excluding the highest luminance level a.
And selecting the partition corresponding to each brightness grade in the low-region brightness grades according to the determined low-region brightness grades because each brightness grade has the corresponding partition in the image to be projected and displayed.
In step S135, determining that the low-region luminance level corresponding sub-region is in the corresponding region of the luminous flux control element, and determining a decreasing amplitude of the luminous flux in the corresponding region in the order of high and low between the low-region luminance levels, the decreasing amplitude increasing in the order of high and low between the low-region luminance levels;
and determining areas corresponding to the subareas in the light flux control element according to the subareas corresponding to the brightness levels in the low-zone brightness level. Because each brightness level in the low-region brightness levels corresponds to different brightness size ranges, the high-low sequence of the brightness levels still exists, the luminous flux of the corresponding region in the luminous flux control element is determined according to the high-low sequence, and the luminous flux of the region corresponding to the partition corresponding to the low-brightness level is larger than the luminous flux of the region corresponding to the partition corresponding to the high-brightness level.
For example, there are 4 brightness levels corresponding to the partitions of the image to be projected and displayed, the brightness levels are respectively a brightness level a, a brightness level B, a brightness level C and a brightness level D in the order of the brightness levels, the determined brightness level in the low region is a brightness level C, D, the area corresponding to the brightness level C in the image to be projected and displayed is C1, the area corresponding to the brightness level D is D1, and the area corresponding to C1 in the luminous flux control element is C1, and the area corresponding to D1 in the image to be projected and displayed is D1. Since the luminance level D is lower than that of the luminance level C, the luminous flux of the region D1 is more greatly reduced than that of the region C1 in the luminous flux control element.
In step S136, the light flux in the corresponding region is reduced by the reduction.
By using the method, according to the brightness levels corresponding to the partitions in the image to be projected and displayed, a part or all of the lower brightness levels are determined to be the low-region brightness levels, and then according to the high-low sequence of the brightness levels in the low-region brightness levels, the luminous flux reduction amplitude of the regions, corresponding to the partitions of the brightness levels, in the luminous flux control element is determined, so that the luminous flux reduction amplitude of the corresponding regions is increased along with the high-low sequence of the brightness levels, the originally darker partitions in the image to be projected and displayed are lower in brightness in the image generated by projection, and the contrast of the image to be projected and displayed is improved.
The following are embodiments of the disclosed apparatus that may be used to implement the embodiments of the image projection display method described above. For details not disclosed in the embodiments of the apparatus of the present disclosure, please refer to the embodiments of the display method for image projection of the present disclosure.
Fig. 10 is a block diagram illustrating an image projection apparatus according to an exemplary embodiment, as shown in fig. 10, including but not limited to: a brightness acquisition module 110, an image partitioning module 120, a light flux control module 130, and an imaging display module 140.
An image data obtaining module 110, configured to obtain image data of a display image to be projected;
the image partitioning module 120 is configured to partition the image to be projected and displayed according to the image data, where each partition has a corresponding brightness level;
a luminous flux control module 130, configured to adjust luminous fluxes of regions, corresponding to the respective partitions in the image to be projected and displayed, in the luminous flux control element according to the brightness levels corresponding to the partitions, where the adjustment ranges of the luminous fluxes of the regions in the luminous flux control element corresponding to the partitions with different brightness levels are different;
and the imaging display module 140 is used for the luminous flux control element to project the adjusted light beam to the surface of the DMD light valve, and the DMD light valve modulates the light beam according to the image display driving signal of the image to be projected and displayed and projects the light beam into the projection lens for imaging and displaying.
The implementation processes of the functions and actions of the modules in the device are specifically described in detail in the implementation processes of the corresponding steps in the image projection display method, and are not described again here.
Optionally, as shown in fig. 11, the image partition module 120 includes but is not limited to: an information extraction unit 121 and a partition determination unit 122.
An information extraction unit 121 for extracting luminance information and pixel position information of each pixel in the image data;
and a partition determining unit 122, configured to determine, according to the luminance information and the pixel position information of each pixel, a partition corresponding to the luminance level in the display image to be projected.
Optionally, as shown in fig. 12, the image partition module 120 includes but is not limited to: a brightness level determination unit 124 and a level division determination unit 125.
A brightness level determination unit 124 for determining a brightness level existing in the display image to be projected according to the brightness information of each pixel;
and a grade partition determining unit 125, configured to determine, according to the luminance information and the pixel position information of each pixel, a partition corresponding to each luminance grade in the display image to be projected.
Optionally, as shown in fig. 13, the light flux control module 130 includes but is not limited to: a low brightness level partition determining unit 131 and a luminous flux reducing unit 132.
A low brightness level partition determining unit 131, configured to determine, according to the brightness level corresponding to each partition, a partition corresponding to the low brightness level;
a luminous flux determination reducing unit 132 for determining that the partition corresponding to the low luminance level is in the corresponding area of the luminous flux control element, and reducing the luminous flux of the corresponding area.
Optionally, as shown in fig. 14, the light flux control module 130 includes but is not limited to: a low-level division determination unit 134, a light flux reduction determination unit 135, and a light flux reduction unit 136.
A low-region-level partition determining unit 134, configured to determine, according to the brightness level corresponding to each partition, a low-region brightness level and a partition corresponding to the low-region brightness level;
a luminous flux reduction determining unit 135, configured to determine that the low-region luminance level corresponds to the sub-region in the corresponding region of the luminous flux control element, determine a reduction of the luminous flux in the corresponding region according to a high-low order between the low-region luminance levels, where the reduction is increased in an ascending order between the low-region luminance levels;
a light flux reducing unit 136 for reducing the light flux in the corresponding region by a reduction amplitude.
Fig. 15 is a block diagram illustrating the structure of an optical engine according to an exemplary embodiment, as shown in fig. 15, the optical engine includes but is not limited to:
an illumination light path 10 for receiving and homogenizing a light beam emitted from a projection light source;
a luminous flux control element 20, configured to receive a light beam emitted from the illumination light path, and perform luminous flux adjustment on the light beam in different regions according to a partition determined in a to-be-projected display image, where the luminous flux adjustment amplitude of the regions in the luminous flux control element 20 corresponding to the partitions with different brightness levels is different;
a DMD light valve 30 for receiving the light beam adjusted by the luminous flux control element, modulating the light beam projected onto its surface according to an image display driving signal of the image to be projected and displayed, and projecting the modulated light beam to a projection lens for imaging and displaying;
the optical engine further comprises a control chip 40, wherein the control chip 40 is configured to acquire image data of a to-be-projected display image, and partition the to-be-projected display image according to the image data, and the partition determined in the to-be-projected display image corresponds to the partition region of the luminous flux control element 20.
The optical engine receives the display data, processes the display data to generate image data of the image to be projected and displayed, and controls the DMD light valve 30 to modulate light according to the image display driving signal of the image to be projected and displayed.
The control chip 40 divides the image to be projected and displayed according to the image data, and controls the luminous flux of each region in the luminous flux control element 20 corresponding to each division of the image to be projected and displayed according to the brightness level of each division, so that the brightness of each region is controlled after the light beam of the illumination light path 10 passes through the luminous flux control element 20. The DMD light valve 30 modulates the light controlled by the luminous flux controlling element 20 and projects the light to the lens to generate a projection display image, in which the brightness of different areas of the luminous flux controlling element 20 is reduced to different degrees according to the brightness level of each partition in the corresponding image to be projected and displayed.
And controlling the brightness of each part of the projection display image according to the brightness level of each subarea of the image to be projected and displayed in the image data, so that the brightness of each part of the projection display image is reduced to different degrees according to the original brightness of each subarea of the projection display image, and the contrast and other characteristics of the projection display image are adjusted.
Optionally, the light flux control element 20 is a light transmission device capable of being logically partitioned, and the light transmission device may be a Liquid Crystal light flux control element of an LCD (Liquid Crystal Display), a grating light flux control element, or another light transmission panel. The luminous flux control element 20 allows or blocks light through a plurality of tiny light control switches inside, thereby realizing the control of luminous flux.
Further, the luminous flux control element 20 is configured to:
determining a partition corresponding to a low brightness level according to the brightness level corresponding to each partition;
the low brightness level corresponding section is determined to be in the corresponding area of the luminous flux control element, and the luminous flux of the corresponding area is reduced.
Further, the light passing control element 20 is used for:
determining a low-region brightness level and a partition corresponding to the low-region brightness level according to the brightness level corresponding to each partition;
determining the corresponding area of the low-area brightness grade corresponding subarea on the luminous flux control element, determining the reduction amplitude of the luminous flux in the corresponding area according to the high-low sequence between the low-area brightness grades, and increasing the reduction amplitude gradually according to the high-low sequence between the low-area brightness grades;
the light flux in the corresponding region is reduced in decreasing amplitude.
It is to be understood that the invention is not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be effected therein by one skilled in the art without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. An image projection display method comprising:
acquiring image data of a display image to be projected;
determining the brightness level corresponding to each pixel according to the brightness information of each pixel in the image data, and determining the pixels with adjacent positions and the same brightness level as a partition of the brightness level;
adjusting the luminous flux of each region in the luminous flux control element, which corresponds to each partition in the image to be projected and displayed respectively, according to the brightness level corresponding to each partition, wherein the luminous flux of the regions in the luminous flux control element corresponding to the partitions with different brightness levels is different in adjustment amplitude;
the light flux control element projects the adjusted light beam to the surface of a DMD light valve, the DMD light valve modulates the light beam according to the image display driving signal of the image to be projected and displayed, and projects the light beam into a projection lens for imaging and displaying, and the contrast of the image displayed by the projection lens is different from that of the image to be projected and displayed.
2. The method according to claim 1, wherein the determining a brightness level corresponding to each pixel according to the brightness information of each pixel in the image data, and determining pixels with adjacent positions and the same brightness level as a partition of a brightness level comprises:
extracting brightness information and pixel position information of each pixel in the image data;
determining the brightness level corresponding to each pixel according to the brightness information of each pixel;
and determining pixels with adjacent positions and the same brightness level as a partition of the brightness level according to the pixel position information of each pixel.
3. The method according to claim 1, wherein the brightness levels corresponding to the partitions are a high brightness level and a low brightness level, and the adjusting the luminous flux of each region of the luminous flux control element corresponding to each partition in the image to be projected according to the brightness level corresponding to each partition comprises:
determining a partition corresponding to a low brightness level according to the brightness level corresponding to each partition;
and determining that the subarea corresponding to the low brightness level is in the corresponding area of the luminous flux control element, and reducing the luminous flux of the corresponding area.
4. The method according to claim 1, wherein the brightness levels corresponding to the partitions are a plurality of brightness levels, and the adjusting the luminous flux of each region of the luminous flux control element corresponding to each partition in the image to be projected according to the brightness level corresponding to each partition comprises:
determining a low-region brightness level and a partition corresponding to the low-region brightness level according to the brightness level corresponding to each partition;
determining that the low-region brightness level corresponding sub-region is in the corresponding region of the luminous flux control element, and determining the reduction amplitude of the luminous flux in the corresponding region according to the high-low sequence between the low-region brightness levels, wherein the reduction amplitude is increased progressively according to the high-low sequence between the low-region brightness levels;
the luminous flux in the corresponding region is reduced in accordance with the reduction.
5. An optical engine, comprising, in accordance with a direction of light beam transmission:
the illumination light path is used for receiving and homogenizing the light beam emitted by the projection light source;
the luminous flux control element is used for receiving the light beams emitted by the illumination light path, determining the brightness level corresponding to each pixel according to the brightness information of each pixel in the image to be projected and displayed, determining the pixels which are adjacent in position and have the same brightness level as a partition of the brightness level, and adjusting the luminous flux of the light beams in regions according to the determined partitions, wherein the regions of different brightness levels have different luminous flux adjustment amplitudes in the corresponding luminous flux control elements;
the DMD light valve is used for receiving the light beam adjusted by the luminous flux control element, modulating the light beam projected to the surface of the DMD light valve according to an image display driving signal of the image to be projected and displayed, and inputting the light beam into a projection lens for imaging and displaying, wherein the contrast of the image displayed by the projection lens is different from that of the image to be projected and displayed;
the optical engine further comprises a control chip, wherein the control chip is used for acquiring image data of a to-be-projected display image, partitioning the to-be-projected display image according to the image data, and the partition determined in the to-be-projected display image corresponds to the partition area of the luminous flux control element.
6. The optical engine of claim 5 wherein the light flux control element is a logically partitionable light transmissive device.
7. An optical engine as recited in claim 5, wherein the luminous flux control element is further configured to:
determining a partition corresponding to a low brightness level according to the brightness level corresponding to each partition;
and determining that the low brightness level corresponding sub-area is in the corresponding area of the luminous flux control element, and reducing the luminous flux of the corresponding area.
8. An optical engine as recited in claim 5, wherein the luminous flux control element is further configured to:
determining a low-region brightness level and a partition corresponding to the low-region brightness level according to the brightness level corresponding to each partition;
determining that the low-region brightness level corresponding sub-region is in the corresponding region of the luminous flux control element, and determining the reduction amplitude of the luminous flux in the corresponding region according to the high-low sequence between the low-region brightness levels, wherein the reduction amplitude is increased progressively according to the high-low sequence between the low-region brightness levels;
the luminous flux in the corresponding region is reduced in accordance with the reduction.
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| CN110873995B (en) * | 2018-08-31 | 2021-07-23 | 青岛海信激光显示股份有限公司 | Projection method, projection system and projector |
| CN110876045B (en) * | 2018-08-31 | 2023-03-14 | 青岛海信激光显示股份有限公司 | Projection method and projector |
| CN108965841B (en) * | 2018-08-31 | 2021-08-24 | 青岛海信激光显示股份有限公司 | Projection optical system and projection display method |
| CN111147831A (en) * | 2018-11-02 | 2020-05-12 | 深圳光峰科技股份有限公司 | Projection system and projection control method |
| CN109698948B (en) * | 2019-01-31 | 2021-04-23 | 广景视睿科技（深圳）有限公司 | Projection method and projection equipment |
| CN111526343B (en) * | 2019-02-01 | 2022-03-01 | 中国电影器材有限责任公司 | Digital film projection method and system |
| CN111610686A (en) * | 2019-02-22 | 2020-09-01 | 深圳光峰科技股份有限公司 | Light source system, light source assembly, display device and control method thereof |
| CN109951649B (en) * | 2019-04-23 | 2024-03-01 | 光沦科技(深圳)有限公司 | Local self-adaptive imaging system and local self-adaptive imaging control method |
| CN114157844B (en) * | 2020-09-08 | 2023-06-23 | 青岛海信激光显示股份有限公司 | Laser projection device and projection display method thereof |
| CN114153119B (en) * | 2020-09-08 | 2024-04-02 | 青岛海信激光显示股份有限公司 | Laser projection device and projection display method thereof |
| CN112596332B (en) * | 2020-12-23 | 2022-03-11 | 广景视睿科技（深圳）有限公司 | Projection system and projector |
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