CN2543303Y

CN2543303Y - Detecting device of image correction for projector equipment

Info

Publication number: CN2543303Y
Application number: CN 02231653
Authority: CN
Inventors: 刑凤言
Original assignee: Mitac Technology Corp
Current assignee: Getac Technology Corp
Priority date: 2002-04-23
Filing date: 2002-04-23
Publication date: 2003-04-02
Anticipated expiration: 2012-04-23

Abstract

A detecting device of an image correction for a projector equipment is used to solve the problem of generating a trapezium distortion of a projection image on a projection surface for the projector equipment, which consists of a position inductor keeping a vertical state under using environment and a plurality of distance-measuring components. When the projector equipment is located, a distance data to the projection surface can be obtained from the distance-measuring components, then a deviation value as a basis of the image correction for the projector equipment can be obtained by a method of geometric operations, thus an aim of trapezium correction is achieved.

Description

The checkout gear of projector equipment adjustment of image

(1) technical field

The checkout gear of the relevant a kind of projector equipment adjustment of image of the utility model, can be applicable to liquid crystal projecting (LCD Projector), adjusted value when producing distortion or distortion so as to obtaining the image that is projeced on the flat screen is with as further to the foundation of image adjustment focal length and keystone (keystone adjustment).

(2) background technology

Utilize LCD (LCD; Liquid Crystal Display) show image, and by the light that focuses on image is throwed the technology that is shown in long-range perspective plane (as screen or metope) and known by people's door already, for example United States Patent (USP) the 5th, 749, No. 641, the 5th, 947, just disclosed similar techniques No. 576.Along with the development of shadow casting technique, the breakthrough on projector equipment recently has significant progress.What wherein liquid crystal projector can be suitable is compact, very convenient on carrying, and is suitable in the high PowerPoint work of mobility.

See also Fig. 1,2, known liquid crystal projector is to provide projection required light source by a light source generator 11 (being generally a bulb) that is positioned at LCDs 10 rears, and light source is also by a reflector 12 (being generally the speculum of a parabolic surface) reflection a becoming collimated light beam, pass LCDs 10 then, by a camera lens 13 focusing backs LCDs 10 shown raw videos are projected in the perspective plane 14 in a distant place at last, this kind perspective plane 14 is a straight surface (for example screen or metope) normally, when the projection optical axis at liquid crystal projector center was projected to perspective plane 14 with the plan position approach perpendicular to perspective plane 14, the projection image that is projected to perspective plane 14 can't produce distortion.

But liquid crystal projector is under general service condition, if not its installing or the position of putting are higher than the central point on perspective plane 14, it is the central point that is lower than perspective plane 14, that is to say the center projection optical axis L of liquid crystal projector and non-perpendicular to the flat surface on perspective plane 14, but be projeced into perspective plane 14 (as Fig. 3 with a certain elevation angle or the angle of depression, shown in 4), the projection image that be projected to perspective plane 14 this moment will produce distortion, because with regard to light arrives perspective planes 14 from the focus 131 of camera lens distance (being designated hereinafter simply as light path), the light path of video light projected line will be elongated along with the increase of projection elevation angle (or projection angle of depression).Therefore, the distortion situation of general goal projection image of healing light path will heal seriously, as shown in Figure 4, suppose that optimal images Im-B is a rectangle frame, then liquid crystal projector is to be projected to plane projection face 14 with a certain elevation angle or the angle of depression under condition shown in Figure 3, and it is one wide at the top and narrow at the bottom trapezoidal that formed projection image Im-P will be deformed into as shown in Figure 4; In other words, aforesaid trapezoidal problem is under the excessive situation in the projector lens elevation angle or the angle of depression, make the projection picture present wide at the top and narrow at the bottom or low wide and up narrow trapezoidal distortion phenomenon, and the degree of distortion and distortion can be even more serious along with the increase of projector distance (or light path) and projection elevation angle.

(3) utility model content

Main purpose of the present utility model is to provide a kind of checkout gear of projector equipment adjustment of image for solving image trapezoidal distortion problem, so that projector equipment can't make projection optical axis L in center perpendicular to the flat surface on perspective plane in environment for use the time, can be proofreaied and correct scrambled image by the means of revising.

According to above-mentioned purpose, the checkout gear of projector equipment adjustment of image of the present utility model, be used to obtain the trapezoidal distortion numerical value on projector equipment projection image to a perspective plane, with foundation as internal circuit control adjustment of image, be characterized in, include: a position sensor is arranged at mobilizable relation on the position of camera lens of this projector equipment, and has a balance weight assembly and make this position sensor keep the vertical foundation of state to adjust as this camera lens under environment for use; And several range finding assemblies, it is that center of circle five equilibrium is arranged on this position sensor with this optical center axle, is used for obtaining respectively the range data to this perspective plane, obtains the numerical value of keystone in the mode by geometric operation.

The utility model can be obtained range data to the perspective plane by the range finding assembly, and then obtain deviate by the mode of geometric operation after projector equipment is put the location, with the foundation as the projector equipment correcting image, reaches the purpose of keystone.

For further specifying the purpose of this utility model, design feature and effect, the utility model is described in detail below with reference to accompanying drawing.

(4) description of drawings

Fig. 1 is the organigram of traditional projector equipment;

Fig. 2 is the schematic diagram that when showing the central projection optical axis normal to screen of traditional projector equipment image is projected to the situation on perspective plane;

Fig. 3 shows that traditional projector equipment is projected to image with the relation at a certain elevation angle schematic diagram of the situation of plane formula screen;

Fig. 4 throws the schematic diagram of image with respect to the distortion situation of optimal images in the displayed map 3;

Fig. 5 is the schematic perspective view that shows the utility model checkout gear;

Fig. 6 is the schematic side view that shows the utility model checkout gear;

Fig. 7 shows that the utility model checkout gear is incorporated into the user mode schematic diagram on the projector equipment; And

Fig. 8 A, 8B are the end views of Fig. 7.

(5) embodiment

The utility model mainly is with the problem that solves projector equipment projection image distortion, particularly solves the problem of projector equipment because of the too high or too low image trapezoidal distortion that is caused during the central point of (for example screen or metope etc.) in the perspective plane in installing or the position of putting.

Problem at the image trapezoidal distortion, the utility model is not the function for image is proofreaied and correct, but a kind of image distortion degree that can detect can proofread and correct the adjustment structure of projector equipment inside according to the data that obtain so that adjustment data to be provided.

See also Fig. 5,6, a preferred embodiment of the present utility model shown in the figure be arranged at checkout gear on the projector equipment, this checkout gear includes: a position sensor 20 and several range finding assemblies 21 (as optical sensor); Wherein position sensor 20 is to be arranged on the projector equipment with mobilizable relation, and be provided with a balance weight assembly 22 thereon, make position sensor 20 under normality, keep vertical state, obtain the vertical direction of projector equipment, with the foundation of adjusting as camera lens.

As for range finding assembly 21 is to be illustrated with four in the present embodiment, all range finding assemblies 21 are to be the center of circle with the optical center axle, five equilibrium is arranged on the position inductor 20, just be arranged at 0 respectively, 90, on the positions of 180 and 270 degree, and has an identical angle (Θ) with central shaft.

Please consult Fig. 7 simultaneously, when projector equipment 2 is put the location in environment for use, and make camera lens 23 behind the perspective plane, at first can obtain the upright position of projector equipment 2 in environment for use by the position sensor in the above-mentioned detection device 20, allow behind four range finding assembly 21 perpendicular positionings, can measure the distance that four direction arrives perspective plane 14 respectively by range finding assembly 21 more subsequently, and then by behind the mathematics geometric operation, obtain the adjustment numerical value of keystone, adopt when adjusting for projector equipment 2.

Please consult Fig. 8 A, 8B more simultaneously, further specify as follows for the producing method of adjusting numerical value, after obtaining four range findings assemblies 21 arrive the distance on perspective plane 14 respectively, if four distances are represented with d1, d2, d3, d4 respectively, can utilize upper and lower two sides' of expression d1 and d2 length, after doing the similar triangles computing with the distance of perspective plane 14 and light source, just can obtain the keystone data of image vertical direction.Similarly, method can be obtained the keystone data of horizontal direction again by d3 and d4 according to this.

By the adjustment distance of aforementioned obtained vertical and horizontal two directions, promptly can be used as the foundation that projector equipment is adjusted image, and then solve the problem of image trapezoidal distortion.

Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the utility model, and be not to be used as qualification of the present utility model, as long as in connotation scope of the present utility model, all will drop in the scope of the utility model claims variation, the modification of the above embodiment.

Claims

1. the checkout gear of a projector equipment adjustment of image is used to obtain the trapezoidal distortion numerical value that projector equipment throws image to a perspective plane, and the foundation with as internal circuit control adjustment of image is characterized in that, includes:

One position sensor is arranged at mobilizable relation on the position of camera lens of this projector equipment, and has a balance weight assembly and make this position sensor keep the vertical foundation of state to adjust as this camera lens under environment for use; And

Several assemblies of finding range, it is that center of circle five equilibrium is arranged on this position sensor with this optical center axle, is used for obtaining respectively the range data to this perspective plane, obtains the numerical value of keystone in the mode by how much what computings.

2. the checkout gear of projector equipment adjustment of image as claimed in claim 1 is characterized in that, the range finding assembly that is arranged on this position sensor has four.

3. the checkout gear of projector equipment adjustment of image as claimed in claim 2 is characterized in that, this range finding assembly is arranged at respectively on the position of 0,90,180 and 270 degree.

4. the checkout gear of projector equipment adjustment of image as claimed in claim 1 or 2 is characterized in that, several range finding assemblies have an identical angle with central shaft.