CN102662295B - Method and device for adjusting projection display screen size of projector - Google Patents
Method and device for adjusting projection display screen size of projector Download PDFInfo
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Abstract
The invention discloses a method and a device for adjusting a projection display screen size of a projector. In the method and the device for adjusting the projection display screen provided by the invention, the present environmental light brightness of the present service environment are obtained in real time; and then the size of the present projection display screen is adjusted in real time according to the correspondence of the obtained present environmental light brightness and the predetermined environmental light brightness to the size of the projection display screen. The method and the device for adjusting the projection display screen provided in the invention are capable of changing the projection display screen size according to the intensity of the environmental light.
Description
Technical Field
The present invention relates to a technology for adjusting a projection display device, and more particularly, to a method and an apparatus for adjusting a projection display screen size of a projection device.
Background
In most existing projection device products, the size of the projection display screen of the projection device can be adjusted. For example, a projector that adjusts the screen size and the brightness according to the environment size has been proposed in the related art. In the projector, the distance from the projector to the front of the projector and the distance from the projector to the rear of the projector can be detected, and the brightness of the projector can be adjusted according to the distance from the projector to the front of the projector and the distance from the projector to the rear of the projector.
Although the projection devices in the prior art can display large-sized pictures, in the actual application process, the requirements on the display effect of the projection devices are different under different application environments and different ambient light, and the intensity of the ambient light in the projection process has a great influence on the projection display. For example, in a display environment with strong external light, the display effect of the projection may be poor, and if the size of the projection display screen is not changed, the content displayed in the projection display screen cannot be seen clearly by the viewer. In addition, according to general user experience, in a scene with high brightness, if the size of a projection display picture is small, the display effect is better; in a scene with darker brightness, if the size of the projection display picture is larger, the display effect is better.
However, in the method and apparatus for adjusting the size of the projection display screen in the above-mentioned prior art, the size and brightness of the projection display screen are adjusted according to the size of the usage environment, and the influence of the intensity of the ambient light on the size of the projection display screen is not considered, so that the size of the projection display screen cannot be changed according to the intensity of the ambient light. In addition, the change of the projection display screen in the projector is set in the projection apparatus by the projector manufacturer, and the user cannot change the corresponding parameter and cannot set the familiar viewing mode. Since different users have different viewing habits and have no unified standard, the projection apparatus in the prior art generally does not consider the habits of the users, so that different users cannot obtain personal optimized experience.
Disclosure of Invention
According to the present invention, a method and apparatus for adjusting the size of a projection display screen are provided, which can change the size of the projection display screen according to the intensity of ambient light.
According to an aspect of the present invention, there is provided a method for adjusting a size of a projection display screen of a projection apparatus, the method comprising: acquiring the current ambient light brightness of the current use environment of the projection equipment in real time; and adjusting the size of the current projection display picture in real time according to the acquired current environment light brightness and the corresponding relation between the preset environment light brightness and the size of the projection display picture.
Wherein, the adjusting the size of the current projection display picture in real time according to the acquired current environment light brightness and the corresponding relationship between the preset environment light brightness and the size of the projection display picture comprises: determining a brightness grade corresponding to the current ambient light brightness in an ambient brightness range with N brightness grades; determining and adjusting the size of the current projection display picture according to the corresponding relation between the determined brightness level and the size of the projection display picture and the preset brightness level; wherein N is an integer greater than or equal to 1 and less than or equal to the difference between the maximum size and the minimum size of the projection display screen.
Wherein, before determining a brightness level corresponding to the current ambient light brightness in the ambient brightness range having N brightness levels, the method further comprises: and after the position of the projection equipment is fixed, selecting an environment brightness range corresponding to the current use environment of the projection equipment from preset environment brightness ranges as a current environment brightness range.
Wherein, before selecting an ambient brightness range corresponding to a current usage environment of the projection device from preset ambient brightness ranges as a current ambient brightness range after the position of the projection device is fixed, the method further comprises: detecting k possible use environments of the projection equipment in advance; setting k environment brightness ranges corresponding to the k using environments according to the detection result, and dividing the brightness in each environment brightness range into N brightness levels; wherein k is the number of possible using environments of the projection equipment, N is the number of brightness levels in each environment brightness range, and k is a natural number.
Wherein the dividing the brightness in each ambient brightness range into N brightness levels comprises: the brightness in the ambient brightness range is divided into N brightness levels on average.
Wherein the dividing the brightness in each ambient brightness range into N brightness levels comprises: and dividing the brightness in the ambient brightness range into N brightness levels with preset sizes.
Before determining a brightness level corresponding to the current ambient light brightness in an ambient brightness range having N brightness levels, and after selecting an ambient brightness range corresponding to the current usage environment of the projection device from preset ambient brightness ranges as a current ambient brightness range after the position of the projection device is fixed, the method further includes: acquiring the current distance between the projection equipment and a projection display surface, and determining the size range of the projection display picture according to the current distance; and determining the size of the projection display picture corresponding to each brightness gear in the current environment brightness range according to the size range of the projection display picture.
Wherein determining the size range of the projected display frame according to the current distance comprises: and calculating the minimum size and the maximum size of a projection display picture projected by the projection equipment according to the acquired current distance and the projection ratio of the projection equipment.
Determining the size of the projection display picture corresponding to each brightness level in the current environment brightness range according to the size range of the projection display picture comprises the following steps: and when the current environment brightness range has N brightness levels, directly setting the sizes of the N projection display pictures which are in one-to-one correspondence with the N brightness levels in the size range of the projection display pictures.
Determining the size of the projection display picture corresponding to each brightness level in the current environment brightness range according to the size range of the projection display picture comprises the following steps: and when the current environment brightness range has N brightness levels, calculating the sizes of N projection display pictures corresponding to the N brightness levels one by one according to the contrast, the output brightness of the projection equipment and the environment brightness corresponding to each brightness level.
Wherein the method further comprises: adjusting the value of N in real time, and storing the adjusted value of N in the projection equipment; and in the subsequent projection display, the current projection display picture size is determined again by the adjusted value of N.
Wherein the method further comprises: setting the corresponding relation between the current environment light brightness and the size of the projection display picture used by the user as a common viewing mode and storing the common viewing mode in the projection equipment according to the size of the projection display picture used by the user under the current environment light brightness; when the projection device is used again, the current projected display screen size is determined directly from the stored common viewing mode.
Determining the size of the projection display picture corresponding to each brightness level in the current environment brightness range according to the size range of the projection display picture comprises the following steps: when the current environment brightness range has N brightness levels, setting the sizes of S projection display pictures in the size range of the projection display pictures; according to the ratio X of S to N, determining the size of the projection display picture corresponding to each brightness gear in the current environment brightness range one by one; where S is an integer greater than N, and S is the largest integer represented by the number of binary digits closest to N.
Wherein, according to the ratio X of S to N, determining the size of the projection display picture corresponding to each brightness level in the current environment brightness range one by one comprises: determining the size of the projection display picture corresponding to the ith brightness level as the size of the [ iX ] th projection display picture according to the ratio X of S to N; where "[ ]" denotes a rounding operation, i ═ 1,2, 3.
Wherein, adjusting the size of the current projection display picture in real time according to the obtained current environmental light brightness and the corresponding relationship between the preset environmental light brightness and the size of the projection display picture comprises: and determining the zoom amount of a zoom stepping motor sent to the projection equipment according to the corresponding relation between the current environment light brightness and the preset environment light brightness and the size of the projection display picture, and changing the focal length of the zoom lens through the zoom stepping motor so as to change the size of the projection display picture of the projection equipment.
According to another aspect of the present invention, there is provided an apparatus for adjusting a size of a projection display screen of a projection device, the apparatus comprising an ambient light collection module, a processor module and a zoom stepping motor; the environment light acquisition module acquires the current environment light brightness of the current use environment of the projection equipment in real time and sends the acquired current environment light brightness to the processor module; the processor module sends a zooming instruction carrying moving step length information to the zooming stepping motor according to the current ambient light brightness and the corresponding relation between the preset ambient light brightness and the size of the projection display picture; and the zooming stepping motor changes the focal length of a zoom lens in the projection equipment according to the moving step information in the zooming instruction so as to adjust the size of the current projection display picture.
Wherein the processor module sends a zoom instruction to the zoom stepping motor according to the current ambient light brightness comprises: the processor module determines a brightness grade corresponding to the current environment brightness in a current environment brightness range with N brightness grades, and sends a zooming instruction to the zooming stepping motor according to the corresponding relation between the determined brightness grade and the size of a projection display picture and a preset brightness grade; wherein N is an integer greater than or equal to 1 and less than or equal to the difference between the maximum size and the minimum size of the projection display screen.
The device for adjusting the size of the projection display screen may further include: the memorizer, is used for storing the preset ambient brightness scope; the processor module is further configured to select an ambient brightness range corresponding to a current usage environment of the projection device from the ambient brightness ranges stored in the memory as a current ambient brightness range after the position of the projection device is fixed.
The memory is further used for storing the value of N adjusted by the processor module in real time; the processor module is further configured to re-determine a brightness level corresponding to the current ambient light brightness in the current ambient light range according to the adjusted value of N, and send a zoom instruction to the zoom stepping motor according to a correspondence between the determined brightness level and a preset brightness level and the size of the projection display image.
The memory is further used for storing the corresponding relation between the current environment light brightness formed by the size of the projection display picture used by the user and the size of the projection display picture used by the user under the current environment light brightness, and setting the corresponding relation as a common viewing mode; the processor module is further configured to send a zoom instruction to the zoom stepping motor according to the common viewing mode stored in the memory.
Wherein the apparatus further comprises: the distance measurement module is used for measuring the current distance between the projection equipment and a projection display picture and sending the current distance to the processor module; the processor module is further used for determining the size range of the projection display picture according to the current distance; and the size of the projection display picture corresponding to each brightness gear in the current environment brightness range is determined according to the size range of the projection display picture.
It can be seen from the above technical solutions that, in the method and apparatus for adjusting the size of a projection display image in the present invention, one or more environmental brightness ranges are preset, so that after the position of a projection device is fixed, one environmental brightness range can be selected from the preset environmental brightness ranges as a current environmental brightness range, then the size of a projection display image corresponding to each brightness level in the current environmental brightness range is determined according to the current distance between the projection device and a projection display surface, and finally the size of the current projection display image can be determined according to the current environmental brightness of the current use environment, so that the size of the projection display image of the projection device can be automatically changed according to the change of the environmental brightness, thereby achieving the purpose of automatically adjusting the size of the projection display image according to the environmental light intensity, and optimizing the viewing effect, the experience degree of the user is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of the invention and that other embodiments and drawings may be devised by those skilled in the art based on the exemplary embodiments shown in the drawings.
FIG. 1 is a flowchart illustrating a method for adjusting a size of a projection display according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating an implementation of step 102 in an embodiment of the present invention;
FIG. 3 is a diagram illustrating an embodiment of dividing an ambient brightness range into N brightness levels;
FIG. 4 is a diagram illustrating a method for determining a size range of a projected display frame according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a size of a projection display frame and a corresponding brightness level according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an apparatus for adjusting a size of a projection display screen according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.
In order to solve the problem that the size of a projection display picture cannot be changed according to the intensity of ambient light in the prior art, the invention provides a method and a device for adjusting the projection display picture of a projection device.
Fig. 6 is a schematic structural diagram illustrating an apparatus for adjusting the size of a projection display screen according to an embodiment of the present invention. Referring to fig. 6, the apparatus 600 for adjusting the size of the projection display screen of the projection device in the present embodiment includes: an ambient light collection module 601, a processor module 602, and a zoom stepper motor 603.
The ambient light collection module 601 obtains the current ambient light brightness of the current usage environment of the projection device in real time, and sends the obtained current ambient light brightness to the processor module 602. The processor module 602 sends a zoom instruction carrying the moving step information to the zoom stepping motor 603 according to the current ambient light brightness of the projection device and the corresponding relationship between the preset ambient light brightness and the size of the projection display picture. The zoom stepping motor 603 changes the focal length of the zoom lens in the projection apparatus according to the moving step information in the received zoom instruction to adjust the size of the current projection display picture of the projection apparatus. The zoom stepping motor 603 may change the focal length of the zoom lens of the projection apparatus according to the moving step information by using the prior art, and details thereof are not described herein.
Further, in a preferred embodiment of the present invention, the sending, by the processor module 602, the zoom instruction to the zoom stepping motor 603 according to the current ambient light brightness and the preset correspondence between the ambient light brightness and the size of the projected display image includes: the processor module 602 determines a brightness level corresponding to the current ambient light brightness in the current ambient brightness range having N brightness levels, and sends a zoom instruction to the zoom stepping motor 603 according to the correspondence between the determined brightness level and the preset brightness level and the size of the projection display image.
In a preferred embodiment of the present invention, the apparatus for adjusting the size of the projection display screen may further include a memory 604. The memory 604 stores a preset ambient brightness range. After the position of the projection device is fixed, the processor module 602 selects an ambient brightness range corresponding to the current usage environment of the projection device from the ambient brightness ranges stored in the memory 604 as the current ambient brightness range.
In a preferred embodiment of the present invention, the user may also readjust the value of N through the processor module 602 and store the adjusted value of N in the memory 604. After the value of N is adjusted, the processor module 602 determines again a brightness level corresponding to the current ambient light brightness in the current ambient light range according to the adjusted value of N, and sends a zoom instruction to the zoom stepping motor 603 according to the correspondence between the determined brightness level and the preset brightness level and the size of the projection display image.
In the invention, N is a brightness grading value in an environment brightness range under the using environment of the projection equipment, and N is a natural number. In a preferred embodiment of the present invention, the value of N may be preset according to an actual application. For example, the value of N may be set according to the size range of the projection display screen of the projection apparatus and a preset screen size variation.
For example, the size range of the projection display frame projected by the projection apparatus may be set as [ Z ]min，Zmax]The variation of the picture size is h, wherein ZminMinimum size, Z, of a display for projection of a projection devicemaxFor the maximum size of the projection display picture of the projection equipment, the value of N is as follows:
wherein "[ 2 ]]"denotes a rounding operation. The value of h can be preset according to the practical application condition, and h is greater than or equal to the minimum unit h of the picture size change of the projection equipmentmin. Therefore, according to the above formula, the value range of N is:
for example, when Zmin40 cun, ZmaxWhen h is 60 inches and 100 inches, N is 1, that is, only 1 brightness level is set; when Z ismin40 cun, ZmaxWhen h is 10 inches and 100 inches, N is 6, that is, 6 brightness levels are set; when Z ismin40 cun, Zmax100 inch, and h ═ hminWhen the size of the screen is 1 inch, N is 60, that is, 60 brightness levels can be set at most. Therefore, the value range of N at this time is: n is more than or equal to 1 and less than or equal to 60.
In the preferred embodiment of the present invention, the user can set the common viewing mode according to his/her preference. Specifically, each client selects a size of the projection display screen suitable for viewing under certain ambient light brightness according to the preference of the client. After a user selects a size suitable for the user's own projection display picture according to the ambient light brightness, the correspondence between the ambient light brightness and the size of the projection display picture selected by the user is stored in a memory as a common viewing mode of the user. The next time the user uses the projection device, the processor module 602 may send zoom instructions to the zoom stepper motor 603 according to the user's usual viewing mode stored in the memory 604.
Further, in the preferred embodiment of the present invention, the apparatus for adjusting the size of the projection display further comprises a distance measuring module 605. The distance measurement module 605 measures the current distance between the projection device and the projection display surface and sends the current distance to the processor module 602. According to the received current distance, the processor module 602 determines the size range of the projection display picture, and according to the determined size range of the projection display picture, determines the size of the projection display picture corresponding to each brightness level in the current environment brightness range.
In a preferred embodiment of the present invention, the device for adjusting the projection display frame of the projection apparatus may be disposed inside the projection apparatus, or may be disposed outside the projection apparatus.
The following describes in detail a specific method for adjusting a projection display screen of a projection apparatus using the apparatus for adjusting a projection display screen of a projection apparatus of the present invention.
Fig. 1 shows a flow chart of a method for adjusting the size of a projection display screen in an embodiment of the invention. As shown in fig. 1, in step 101, a current ambient light level of a current usage environment of the projection device is obtained.
Preferably, in an embodiment of the present invention, a brightness sensor on the projection device may be used, and the current ambient light brightness of the current usage environment of the projection device is detected according to a predetermined measurement period, so as to obtain the current ambient light brightness of the current usage environment in real time. The time length of the measurement period can be preset, and the time length of the measurement period can be adjusted in real time.
Next, in step 102, the size of the current projection display image of the projection device is adjusted in real time according to the obtained current ambient light brightness and the corresponding relationship between the preset ambient light brightness and the size of the projection display image.
Since the current ambient light brightness of the projection device is obtained in step 101, the size of the current projection display frame may be adjusted in this step according to the obtained current ambient light brightness. Specifically, the processor module 602 determines, according to the current ambient light brightness obtained by the brightness sensor, the size of the projection display image corresponding to the current ambient light brightness from the preset correspondence between the ambient light brightness and the size of the projection display image, and determines the movement step information included in the zoom instruction to be sent to the zoom stepping motor 603. The zoom stepping motor 603 adjusts the zoom lens of the projection device according to the moving step information, so as to adjust the size of the projection display image to the size of the projection display image corresponding to the current ambient light brightness.
In addition, in the projection apparatus, the focal length of the zoom lens may be changed within a preset zoom range. When the focal length of the zoom lens is changed, the size of the projection display picture of the projection device is correspondingly changed. For example, when the focal length of the zoom lens becomes larger, the size of the projection display screen becomes smaller; when the focal length of the zoom lens becomes smaller, the size of the projection display screen becomes larger.
Therefore, preferably, in an embodiment of the present invention, the adjusting of the size of the current projection display of the projection device may be: the zoom stepper motor 603 is used to adjust the focal length of the zoom lens of the projection device, thereby changing the size of the currently projected display picture.
In the above steps 101 to 102, since the processor module 602 may determine, according to the current ambient light brightness of the current usage environment of the projection apparatus and the corresponding relationship between the preset ambient light brightness and the size of the projection display image, the movement step length information included in the zoom instruction to be sent to the zoom stepping motor 603, so that the zoom stepping motor 603 may move according to the movement step length information to drive the zoom lens to adjust the size of the current projection display image, and thus the size of the projection display image of the projection apparatus may automatically change according to the change of the ambient light brightness. For example, when the ambient light brightness becomes higher, the projection display screen size of the projection device can automatically become smaller; when the ambient light brightness is reduced, the size of the projection display picture can be automatically increased, so that the purpose of automatically adjusting the size of the projection display picture according to the ambient light intensity is achieved, the watching effect is optimized, and the user experience is improved.
Preferably, step 102 can be implemented in a variety of ways in embodiments of the present invention. For example, as shown in fig. 2, in a preferred embodiment of the present invention, in step 201, a brightness level corresponding to the current ambient light brightness is determined in a current ambient brightness range having N brightness levels.
In an embodiment of the present invention, the current ambient brightness range has N brightness levels, and each brightness level corresponds to a corresponding brightness range. The value of N may be preset according to the actual application.
Since the current ambient light brightness is already obtained in step 101, in this step, a search can be performed in the current ambient light brightness range to find a brightness level corresponding to the current ambient light brightness, so that a brightness level corresponding to the obtained current ambient light brightness is determined in the current ambient light brightness range.
In step 202, the size of the current projection display picture is determined and adjusted according to the corresponding relationship between the determined brightness level and the preset brightness level and the size of the projection display picture.
In an embodiment of the present invention, a corresponding relationship between each brightness level in the current ambient brightness range and the size of the projection display screen may be preset. Therefore, according to the corresponding relationship and the brightness level determined in step 201, the size of the projection display screen corresponding to the brightness level can be determined, so that the size of the current projection display screen can be adjusted, and the size of the projection display screen corresponding to the determined brightness level becomes the size of the current projection display screen.
Preferably, in an embodiment of the present invention, before the step 201, the method may further include: step 201A, after the position of the projection device is fixed, selecting an ambient brightness range corresponding to the current usage environment of the projection device from preset ambient brightness ranges as a current ambient brightness range.
Since the current usage environment of the projection device can only be completely determined after the position of the projection device is fixed, in a specific embodiment of the present invention, an ambient brightness range corresponding to the current usage environment of the projection device is selected as the current ambient brightness range from one or more preset ambient brightness ranges after the position of the projection device is fixed.
Projection devices may generally be used in a variety of environments of use, for example: a conference room environment, a home environment, or a teaching environment, etc. The range of ambient light brightness is generally different for different usage environments. Therefore, in an embodiment of the present invention, one or more ambient brightness ranges corresponding to the usage environment may be preset for the projection apparatus before step 201A.
Therefore, before step 201A, k possible usage environments of the projection apparatus may be detected in advance, k ambient brightness ranges corresponding to the k usage environments may be set according to the detection result, and the brightness in each ambient brightness range may be divided into N brightness levels. Wherein k is the number of possible using environments of the projection equipment, and N is the number of brightness levels in each environment brightness range; k is an integer greater than or equal to 1, and the values of k and N can be preset according to the practical application condition.
Preferably, in an embodiment of the present invention, the jth ambient brightness range may be represented as [ A ]j，Bj]Wherein j is more than or equal to 1 and less than or equal to k, AjDenotes the minimum value of the luminance of the jth ambient luminance range, BjRepresenting the maximum value of the luminance of the jth ambient luminance range.
For example, a home environment in which the projection device is located may be detected by using the brightness acquisition device, and a maximum brightness value L in the home environment is obtained according to the detection resultmax(e.g., L)max300 Lx), the minimum value of luminance is 0, the ambient luminance range of the home environment can be represented as [0, Lmax]. Similarly, k ambient brightness ranges corresponding to k usage environments may be set in advance.
In addition, as shown in fig. 3, in the embodiment of the present invention, the brightness in the ambient brightness range may be further divided into N brightness levels, and the specific dividing method may be various.
For example, the brightness in the ambient brightness range may be divided into N brightness levels, i.e., N brightness levelsThe brightness range of each brightness level is the same in size. For example, suppose the ambient brightness range [0, L ] of the home environment is definedmax]Dividing the average into N brightness levels, the 1 st brightness level is [0, Lmax/N]The 2 nd brightness level is [ L ]max/N,2Lmax/N],., the Nth brightness level is [ (N-1) Lmax/N，Lmax]。
For another example, the brightness in the ambient brightness range may be divided into N brightness levels with preset sizes according to actual needs. Specifically, when the ambient brightness range of the home environment is [0, 300Lx ] (where Lx is a unit of illuminance, which refers to a value of brightness divided by an area), since an illuminance of 50Lx is relatively dark for a subjective feeling of a human, a 1 st brightness level may be set to [0, 50Lx ]; then, the luminance range of [50Lx, 150Lx ] can be divided into 10 equal-sized luminance steps, that is, the luminance range of each luminance step is 10 Lx; the luminance range of [150Lx, 300Lx ] can then be divided into 8 luminance bins, where the luminance range of the first 7 luminance bins is 20Lx in size and the luminance range of the last luminance bin is 10Lx in size. Therefore, through the above operation, the ambient brightness range of the home environment can be divided into 19 brightness levels.
In summary, before step 201A, k ambient brightness ranges corresponding to k usage environments may be preset, and the brightness in each ambient brightness range may be divided into N brightness levels. Therefore, after the position of the projection device is fixed, the corresponding ambient brightness range can be selected from one or more preset ambient brightness ranges as the current ambient brightness range according to the current use environment of the projection device. In particular, in a specific embodiment of the present invention, if only 1 ambient brightness range, i.e., k is 1, is set in advance, the preset ambient brightness range may be directly used as the current ambient brightness range.
After the current ambient brightness range is selected from the k ambient brightness ranges by using the above method, step 201 may be executed to determine a brightness level corresponding to the current ambient brightness in the current ambient brightness range.
Preferably, before the step 202, after the step 201A, the method may further include: step 202A, obtaining a current distance between the projection device and the projection display surface, and determining a size range of the projection display picture according to the current distance.
In this step, a current distance between the projection device and the projection display surface may be obtained first, for example, a distance measuring device on the projection device may be used to measure the current distance between the projection device and the projection display surface; then, the size range [ Z ] of the projection display picture projected by the projection device can be determined according to the acquired current distancemin，Zmax]Wherein Z isminMinimum size, Z, of a display frame for projection of said projection devicemaxAnd projecting the maximum size of a display picture for the projection equipment.
Preferably, in an embodiment of the present invention, as shown in fig. 4, the determining the size range of the projection display frame of the projection device according to the obtained current distance may be: and calculating the minimum size and the maximum size of the projection display picture projected by the projection equipment according to the acquired current distance and the projection ratio of the projection equipment, thereby obtaining the size range of the projection display picture projected by the projection equipment.
Specifically, the throw ratio of the projection device refers to: the ratio of the projection distance to the width of the projected display frame. As shown in fig. 4, assuming that the projection distance is f and the width of the projection display screen is l, when the values of the projection ratio and f are known, the width l of the projection display screen corresponding to the projection ratio can be calculated from the projection ratio and f. Since the ratio of the length to the width of the projection display screen is generally fixed, for example, the ratio is 4: 3 or 16: 9, the length and the area of the projection display screen can be obtained according to the width l of the projection display screen, so that the size of the projection display screen can be obtained. In an embodiment of the present invention, the size of the projection display screen may be an area of the projection display screen, or a length and a width of the projection display screen.
In addition, since the focal length of the zoom lens of the projection device can be changed within a preset zoom range, the projection ratio of the projection device is also a range value, and has a minimum projection ratio and a maximum projection ratio; therefore, in the embodiment of the present invention, the minimum size Z of the projection display screen of the projection device can be calculated according to the current distance and the minimum projection ratio and the maximum projection ratio of the projection deviceminAnd a maximum dimension ZmaxSo as to obtain the size range of the projection display picture of the projection equipment to be more than or equal to ZminAnd is less than or equal to Zmax. The specific calculation method is not described herein again.
Step 202B, determining the size of the projection display image corresponding to each brightness level in the current environment brightness range according to the size range of the projection display image.
After the size range of the projection display picture, the size of the projection display picture corresponding to each brightness level in the current environment brightness range can be determined according to the size range of the projection display picture.
In the embodiment of the present invention, various methods may be used to determine the size of the projection display frame corresponding to each brightness level. Two methods will be described below as examples.
The first method comprises the following steps:
and when the current environment brightness range has N brightness levels, directly setting the sizes of the N projection display pictures which are in one-to-one correspondence with the N brightness levels in the size range of the projection display pictures.
Specifically, as shown in fig. 5, it is assumed that the current ambient brightness range has N brightness levels, and the brightness ranges of the N brightness levels are equal in size, and the size range of the projection display picture is [40 inches, 100 inches ], the sizes of N projection display pictures can be directly set in the size range of the projection display picture, for example, 100 inches, 95 inches, 90 inches, a.. once., 40 inches, etc., and such that the size of the projected display screen of 100 inches corresponds to the 1 st brightness level in the current ambient brightness range, the size of the projected display screen of 95 inches corresponds to the 2 nd brightness level in the current ambient brightness range, the size of the projected display screen of 90 inches corresponds to the 3 rd brightness level in the current ambient brightness range, and the size of the projected display screen of 40 inches corresponds to the nth brightness level in the current ambient brightness range.
The second method comprises the following steps:
and when the current environment brightness range has N brightness levels, calculating the sizes of N projection display pictures corresponding to the N brightness levels one by one according to the contrast, the output brightness of the projection equipment and the environment brightness corresponding to each brightness level.
Specifically, in a projection apparatus, the contrast ratio (illuminance of projection screen + ambient illuminance)/ambient illuminance, and the illuminance of projection screen (output luminance of projection apparatus/size of projection display screen). Since the contrast of the projection equipment is a fixed value, the output brightness of the projection equipment is a fixed value, and the ambient illumination corresponding to each brightness level is also a determined value, the size of the N projection display pictures corresponding to the N brightness levels one by one can be calculated according to the contrast, the output brightness of the projection equipment and the ambient brightness corresponding to each brightness level.
As can be seen from the above, in the method for adjusting the size of the projection display image, since one or more environmental brightness ranges are preset, after the position of the projection device is fixed, one environmental brightness range can be selected from the preset environmental brightness ranges as the current environmental brightness range, then the size of the projection display image corresponding to each brightness level in the current environmental brightness range is determined according to the current distance between the projection device and the projection display surface, and finally the size of the current projection display image can be determined according to the current environmental brightness of the current usage environment, so that the size of the projection display image of the projection device can be automatically changed according to the change of the environmental brightness, for example, when the environmental brightness is increased, the size of the projection display image can be automatically decreased; when the ambient light brightness is reduced, the size of the projection display picture can be automatically increased, so that the purpose of automatically adjusting the size of the projection display picture according to the ambient light intensity is achieved, the watching effect is optimized, and the user experience is improved.
Further, in order to better take the watching habits of different users into account, in a specific embodiment of the present invention, a user may adjust the value of N in real time, and store the adjusted value of N in the projection device; and in the subsequent projection display, the adjusted value of N is used for determining the size of the current projection display picture again.
In an embodiment of the present invention, the size of the projection display image used by the user under the ambient light brightness may also be stored, and the correspondence between the ambient light brightness and the size of the projection display image selected by the user is set as the common viewing mode of the user and stored in the projection device. When the projection equipment is used by the user again, the current projection display picture size can be directly determined according to the stored common viewing mode, so that the viewing effect is better optimized, and the user experience is improved.
Furthermore, because the change of the ambient light is generally a relatively slow change process, rather than a severe change process, when the size of the projection display picture of the projection device changes with the change of the ambient light, a gradual change process of the picture can be designed, so that the change process of the size of the projection display picture is smoother and softer, and the problem of abrupt change of the size of the projection display picture can be avoided.
Specifically, in a specific embodiment of the present invention, the step 202B may be implemented by:
when the current environment brightness range has N brightness levels, setting the sizes of S projection display pictures in the size range of the projection display pictures; and according to the ratio X of S to N, determining the sizes of the projection display pictures corresponding to the brightness levels in the current environment brightness range one by one. Wherein S is an integer greater than N. In the invention, the value of S is larger than that of N to implement the change of N gear. Since S is calculated according to the number of binary digits, S takes the value of the largest integer represented by the binary digit number closest to N, or the largest integer represented by a binary digit number one bit larger than the binary digit number. For example, if N is 60, then the variation of N can be completely covered by taking S as a 6-bit binary, i.e. 64, or taking S as an integer 128 represented by a 7-bit binary number.
Preferably, in an embodiment of the present invention, the determining the size of the projection display frame corresponding to each brightness level in the current ambient brightness range one by one may be:
determining the size of the projection display picture corresponding to the ith brightness level as the size of the [ iX ] th projection display picture; where "[ ]" denotes a rounding operation, i ═ 1,2, 3.
Preferably, in an embodiment of the present invention, the rounding operation may be an upward rounding operation or a downward rounding operation.
For example, when the current ambient brightness range has N-15 brightness levels, the size of S-32 projection display screens may be set within the size range of the projection display screen. Then, according to the ratio X of S to N being 2.13, the sizes of the projection display frames corresponding to the brightness levels in the current ambient brightness range can be determined one by one.
For example, when the rounding operation is a rounding-up operation, the 1 st brightness level corresponds to the size of the 3 rd projection display screen, the 2 nd brightness level corresponds to the size of the 5 th projection display screen, the 7 th brightness level corresponds to the size of the 15 th projection display screen, the 8 th brightness level corresponds to the size of the 18 th projection display screen, the 14 th brightness level corresponds to the size of the 30 th projection display screen, and the 15 th brightness level corresponds to the size of the 32 th projection display screen.
When the rounding operation is a downward rounding operation, the 1 st brightness level corresponds to the size of the 2 nd projection display picture, the 2 nd brightness level corresponds to the size of the 4 th projection display picture, the 7 th brightness level corresponds to the size of the 14 th projection display picture, the 8 th brightness level corresponds to the size of the 17 th projection display picture, the 14 th brightness level corresponds to the size of the 29 th projection display picture, and the 15 th brightness level corresponds to the size of the 31 th projection display picture.
Because the number of the sizes of the projection display pictures is larger than the number of the brightness levels, and when the size of the projection display picture is changed, the size of the projection display picture is changed step by step, for example, when the rounding operation is a rounding-up operation and the current environment brightness is changed from a 1 st brightness level to a 2 nd brightness level, the size of the projection display picture is not directly changed from the size of a 3 rd projection display picture to the size of a 5 th projection display picture, but is changed from the size of the 3 rd projection display picture to the size of a 4 th projection display picture and then to the size of the 5 th projection display picture, so that the change of the size of the whole projection display picture can be smooth.
Further, in the embodiment of the present invention, when the current ambient light brightness changes dramatically, a prompt message will be sent to the user before the size of the projection display screen changes; and when the user confirms that the change is carried out or the user confirmation information is not received within the preset time, changing the size of the projection display picture. Through the steps, whether the size of the projection display picture is changed or not can be determined according to the indication of the user when the environmental light brightness is changed drastically, so that the watching habit of the user is respected, and the experience degree of the user is improved.
To sum up, in the method and apparatus for adjusting the size of a projection display image provided in the present invention, one or more environmental brightness ranges are preset, so that after the position of the projection device is fixed, one environmental brightness range can be selected from the preset environmental brightness ranges as a current environmental brightness range, then the size of the projection display image corresponding to each brightness level in the current environmental brightness range is determined according to the current distance between the projection device and the projection display surface, and finally the size of the current projection display image can be determined according to the current environmental brightness of the current usage environment, so that the size of the projection display image of the projection device can be automatically changed according to the change of the environmental brightness, for example, when the environmental brightness is increased, the size of the projection display image can be automatically decreased; when the ambient light brightness is reduced, the size of the projection display picture can be automatically increased, so that the purpose of automatically adjusting the size of the projection display picture according to the ambient light intensity is achieved, the watching effect is optimized, and the user experience is improved. Moreover, the user can adjust the value of N in real time and store the adjusted value of N in the projection equipment, so that the watching effect is better optimized and the user experience is improved. In addition, since the size of the projection display screen larger than the number of the brightness levels can be set, the change of the size of the whole projection display screen can be made very smooth; in addition, when the ambient light brightness changes dramatically, whether the size of the projection display picture changes or not can be determined according to the indication of the user, so that the watching habit of the user is respected, and the experience degree of the user is further improved.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (17)
1. A method of adjusting a projected display screen size of a projection device, the method comprising:
acquiring the current ambient light brightness of the current use environment of the projection equipment in real time;
determining a brightness grade corresponding to the current ambient light brightness in an ambient brightness range with N brightness grades;
determining and adjusting the size of the current projection display picture according to the corresponding relation between the determined brightness level and the size of the projection display picture and the preset brightness level;
adjusting the value of N in real time, and storing the adjusted value of N in the projection equipment;
in the subsequent projection display, the current projection display picture size is determined again by the adjusted value of N;
wherein N is an integer greater than or equal to 1 and less than or equal to the difference between the maximum size and the minimum size of the projection display screen, and the unit of the size is cun.
2. The method of claim 1, prior to determining the brightness level corresponding to the current ambient light brightness in the ambient brightness range having N brightness levels, the method further comprising:
and after the position of the projection equipment is fixed, selecting an environment brightness range corresponding to the current use environment of the projection equipment from preset environment brightness ranges as a current environment brightness range.
3. The method as claimed in claim 2, before selecting an ambient brightness range corresponding to a current usage environment of the projection device from preset ambient brightness ranges as the current ambient brightness range after the position of the projection device is fixed, the method further comprising:
detecting k possible use environments of the projection equipment in advance;
setting k environment brightness ranges corresponding to the k using environments according to the detection result, and dividing the brightness in each environment brightness range into N brightness levels;
wherein k is the number of possible using environments of the projection equipment, N is the number of brightness levels in each environment brightness range, and k is a natural number.
4. The method of claim 3, wherein the dividing the luminance in each ambient luminance range into N luminance bins comprises:
the brightness in the ambient brightness range is divided into N brightness levels on average.
5. The method of claim 3, wherein the dividing the luminance in each ambient luminance range into N luminance bins comprises:
and dividing the brightness in the environment brightness range into N brightness levels, wherein each brightness level corresponds to a preset brightness range.
6. The method of claim 2, before determining a brightness step corresponding to the current ambient light brightness among the ambient brightness ranges having N brightness steps, and after selecting an ambient brightness range corresponding to the current usage environment of the projection device from preset ambient brightness ranges as the current ambient brightness range when the position of the projection device is fixed, the method further comprising:
acquiring the current distance between the projection equipment and a projection display surface, and determining the size range of the projection display picture according to the current distance;
and determining the size of the projection display picture corresponding to each brightness gear in the current environment brightness range according to the size range of the projection display picture.
7. The method of claim 6, the determining a size range of the projected display as a function of the current distance comprising:
and calculating the minimum size and the maximum size of a projection display picture projected by the projection equipment according to the acquired current distance and the projection ratio of the projection equipment.
8. The method according to claim 6, wherein the determining, according to the size range of the projection display, the size of the projection display corresponding to each brightness level in the current ambient brightness range comprises:
and when the current environment brightness range has N brightness levels, directly setting the sizes of the N projection display pictures which are in one-to-one correspondence with the N brightness levels in the size range of the projection display pictures.
9. The method according to claim 6, wherein the determining, according to the size range of the projection display, the size of the projection display corresponding to each brightness level in the current ambient brightness range comprises:
and when the current environment brightness range has N brightness levels, calculating the sizes of N projection display pictures corresponding to the N brightness levels one by one according to the contrast, the output brightness of the projection equipment and the environment brightness corresponding to each brightness level.
10. The method of claim 1, further comprising:
setting the corresponding relation between the current environment light brightness and the size of the projection display picture used by the user as a common viewing mode and storing the common viewing mode in the projection equipment according to the size of the projection display picture used by the user under the current environment light brightness;
when the projection device is used again, the current projected display screen size is determined directly from the stored common viewing mode.
11. The method of claim 6, wherein determining the size of the projection display corresponding to each brightness level in the current ambient brightness range according to the size range of the projection display comprises:
when the current environment brightness range has N brightness levels, setting the sizes of S projection display pictures in the size range of the projection display pictures;
according to the ratio X of S to N, determining the size of the projection display picture corresponding to each brightness gear in the current environment brightness range one by one; where S is an integer greater than N, and S is the largest integer represented by the number of binary digits closest to N.
12. The method as claimed in claim 11, wherein the determining the size of the projection display image corresponding to each brightness level in the current ambient brightness range one by one according to the ratio X of S to N comprises:
determining the size of the projection display picture corresponding to the ith brightness level as the size of the [ iX ] th projection display picture according to the ratio X of S to N; where "[ ]" denotes a rounding operation, i ═ 1,2,3, …, N.
13. The method of claim 1, determining a brightness level corresponding to a current ambient light brightness in an ambient brightness range having N brightness levels; determining and adjusting the size of the current projection display picture according to the corresponding relation between the determined brightness level and the size of the projection display picture and the preset brightness level, wherein the step of determining and adjusting the size of the current projection display picture comprises the following steps:
and according to the corresponding relation between the determined brightness gear and the preset brightness gear and the size of the projection display picture, determining the zoom amount of a zoom stepping motor sent to the projection equipment, and changing the focal length of a zoom lens through the zoom stepping motor so as to change the size of the projection display picture of the projection equipment.
14. A device for adjusting the size of a projection display picture of projection equipment comprises an ambient light acquisition module, a processor module, a zooming stepping motor and a memory; wherein,
the ambient light acquisition module acquires the current ambient light brightness of the current use environment of the projection equipment in real time and sends the acquired current ambient light brightness to the processor module;
the processor module determines a brightness level corresponding to the current ambient light brightness in an ambient brightness range with N brightness levels; sending a zooming instruction carrying moving step length information to the zooming stepping motor according to the corresponding relation between the determined brightness level and the size of the projection display picture and the preset brightness level;
and the zooming stepping motor changes the focal length of a zoom lens in the projection equipment according to the moving step information in the zooming instruction so as to adjust the size of the current projection display picture.
The memory is used for storing the value of N after the real-time adjustment of the processor module;
the processor module re-determines a brightness level corresponding to the current ambient light brightness in the current ambient light range according to the adjusted value of N, and sends a zooming instruction to the zooming stepping motor according to the corresponding relation between the determined brightness level and the size of the projection display picture and the preset brightness level;
wherein N is an integer greater than or equal to 1 and less than or equal to the difference between the maximum size and the minimum size of the projection display screen, and the unit of the size is cun.
15. The apparatus of claim 14, wherein,
the memory is also used for storing a preset ambient brightness range;
the processor module is further configured to select an ambient brightness range corresponding to a current usage environment of the projection device from the ambient brightness ranges stored in the memory as a current ambient brightness range after the position of the projection device is fixed.
16. The apparatus of claim 15, wherein,
the memory is further used for storing the corresponding relation between the current environment light brightness formed by the size of the projection display picture used by the user and the size of the projection display picture used by the user under the current environment light brightness, and setting the corresponding relation as a common watching mode;
the processor module is further configured to send a zoom instruction to the zoom stepping motor according to the common viewing mode stored in the memory.
17. The apparatus of claim 15, further comprising: a distance measuring module;
the distance measuring module is used for measuring the current distance between the projection equipment and a projection display picture and sending the current distance to the processor module;
the processor module is further used for determining the size range of the projection display picture according to the current distance; and the size of the projection display picture corresponding to each brightness gear in the current environment brightness range is determined according to the size range of the projection display picture.
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