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Projection device and automatic focusing method

A technology of projection equipment and projection surface, applied in the field of projection display, can solve problems such as complicated operation, and achieve the effect of simplifying the adjustment process

Active Publication Date: 2012-02-15
HISENSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the above process, the user needs to manually adjust the focal length of the projection device step by step to make the image projected on the screen the most suitable definition, and the operation is cumbersome.

Method used

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  • Projection device and automatic focusing method
  • Projection device and automatic focusing method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A projection device such as figure 1 As shown, it includes a processing unit, a projection unit, a projection lens group and a projection lens drive unit; the processing unit is respectively connected to the projection unit and the projection lens drive unit; the projection device also includes an image acquisition unit, the image acquisition The unit is connected to the processing unit; at least three laser emitters are arranged around the image acquisition unit;

[0030] The laser emitter is used to emit light beams, and the light beams form light spots on the projection surface;

[0031] The image acquisition unit is configured to acquire images on the projection surface;

[0032] The processing unit is configured to calculate the arithmetic mean of the side lengths of the graphics surrounded by the light spots according to the image, and determine the optimal focal length of the projection lens group according to the arithmetic mean of the side lengths of the graph...

Embodiment 2

[0077] According to the projection device and the auto-focusing method described in Embodiment 1, during auto-focusing, the speed of auto-focusing of the projection device will be reduced due to the large amount of computation for image acquisition and calculation of the best focal length.

[0078] In order to solve the above problems, specifically, the projection device, such as Figure 7 As shown, it also includes a memory connected to the processing unit;

[0079] The memory is used to store a relationship table between the arithmetic mean of the side lengths of the graph and the object distance of the image acquisition unit.

[0080] The processing unit includes a side length calculation module, a table query module and a focal length determination module;

[0081] The side length calculation module is used to calculate the arithmetic mean of the focusing side length;

[0082] The table query module is used to query the relationship table according to the arithmetic mean...

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Abstract

The invention discloses a projection device and an automatic focusing method, and belongs to the technical field of projection display. The projection device is designed for solving the problem that the focal distance of a projection lens group needs to be adjusted by a user manually in the prior art. The projection device comprises a processing unit, a projection unit, a projection lens group and a projection lens driving unit. The processing unit is respectively connected with the projection unit and the projection lens driving unit; the projection device further comprises an image acquiring unit which is connected with the processing unit; and at least three laser emitters are arranged around the image acquiring unit.

Description

technical field [0001] The invention relates to the technical field of projection display, in particular to an automatic focusing projection device and an automatic focusing method. Background technique [0002] When teaching in schools, giving speeches at conferences, displaying materials in companies, and watching high-quality movies at home, projection equipment will be used, which gradually expands the scope of use of projection equipment. When using a projection device, in order to make the projection device project and display a clear image on the screen, the focal length of the projection device needs to be adjusted. [0003] In the prior art, when adjusting the focal length of the projection equipment, manual methods are often used, that is, after the image to be played is projected onto the screen, the clarity of the image on the screen is judged by human eyes, and the adjustment is made according to the judgment. The focal length of the projection equipment, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/53G02B7/36
Inventor 李磊张培龙关爽
Owner HISENSE
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