Method and device for regulating focal length of projector

A projector and projection distance technology, applied in the field of projectors, can solve problems such as poor user experience, time-consuming and labor-intensive adjustment process, and achieve the effect of improving user experience and efficiency

Active Publication Date: 2015-04-22
NUBIA TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When using a projector, in order to make the projected image displayed on the projection screen clear, it is necessary to adjust the focal length of the projector. Currently, the user usually needs to manually adjust the adjustment process, which is cumbersome and time-consuming.
Especially for mobile terminals, the projection distances are different each time they are used, and the optimal focal lengths corresponding to different projection distances are different. Therefore, users have to go through a cumbersome focal length adjustment process every time they use the projector, which is time-consuming and labor-intensive. bad

Method used

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  • Method and device for regulating focal length of projector
  • Method and device for regulating focal length of projector
  • Method and device for regulating focal length of projector

Examples

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no. 1 example

[0036] see figure 1 , propose the first embodiment of the method for adjusting the focal length of the projector according to the present invention, the method includes the following steps:

[0037] Step S10: Obtain at least two sets of focal length-definition corresponding values ​​under the current projection distance

[0038] Specifically, after the projector (which may be a special projection device or a projector module in the mobile terminal) is started, it first performs projection at the current projection distance, so as to automatically perform focus correction. Collect the projected image projected on the screen, obtain the clarity of the projected image, and obtain the current focal length to obtain a set of focal length-definition corresponding values; automatically adjust the focal length, and project again with the adjusted focal length, repeat the previous step, Obtain another set of focal length-sharpness corresponding values ​​in the same way, and so on, mul...

no. 2 example

[0055] see Figure 5 , propose the second embodiment of the method for adjusting the focal length of the projector according to the present invention, the method includes the following steps:

[0056] Step S20: Obtain the current projection distance

[0057] After the projector is started, the distance between the projector and the projection screen is obtained through a distance detection device (such as an infrared range finder), and the distance is the current projection distance.

[0058] Step S21: According to the current projection distance, select the corresponding relationship between focal length and sharpness that best matches the current projection distance from the correspondence between focal length and sharpness at multiple pre-stored projection distances

[0059] The pre-stored corresponding relationship between focal length and definition under multiple projection distances can be stored locally or in the cloud. The corresponding relationship between focal le...

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Abstract

The invention discloses a method and device for regulating the focal length of a projector. The method comprises the following steps of acquiring the current projecting distance, or acquiring at least two groups of corresponding values of focal length and definition at the current projecting distance; selecting a corresponding relation between the focal distance and the definition, which is most matched with the current projecting distance, from the plurality of pre-stored corresponding relations between the focal length and the definition at the projecting distance according to the corresponding value of the current projecting distance or the focal length and the definition; acquiring the optimal focal length corresponding to the maximum definition at the current projecting distance according to the corresponding relation between the focal length and the definition which are most matched with the current projecting distance; and regulating the focal length of the projector to the optimal focal length to obtain a clear projected image. Therefore, the automatic regulation of the focal length of the projector is realized, the projector is more intelligent and humanized, the operation of manually regulating by a user is not needed, the user experience is improved, and the efficiency is increased.

Description

technical field [0001] The invention relates to the technical field of projectors, in particular to a method and a device for adjusting the focal length of a projector. Background technique [0002] Projectors have been widely used in teaching, office and life fields, especially with the rapid development of mobile terminals, many mobile terminals are also equipped with projectors, which brings great convenience and fun to people's work and life. When using a projector, in order to make the projected image displayed on the projection screen clear, it is necessary to adjust the focal length of the projector. Currently, the user usually needs to manually adjust the adjustment process, which is cumbersome and time-consuming. Especially for mobile terminals, the projection distances are different each time they are used, and the optimal focal lengths corresponding to different projection distances are different. Therefore, users have to go through a cumbersome focus adjustment p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/53H04N9/31
CPCG03B21/53H04N9/31H04N9/317
Inventor 魏强里强
Owner NUBIA TECHNOLOGY CO LTD
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