Deflection compensating method of portable display device

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Technical field to which the invention belongs]

The present invention relates to a method for correcting shaking of a portable display device.

【0002】

[Conventional technology]

When the observer is observing the image displayed by the portable display device, when one or both of the portable display device and the observer's head moves, the image display position of the observer and the portable display device There is a problem that the relative position with and is changed, making it difficult to see the image.

【0003】

[Problems to be Solved by the Invention]

The present invention is a portable display device that can prevent the relative position of the observer and the image display position of the portable display device from changing when one or both of the portable display device and the observer's head move. It is an object of the present invention to provide a method of correcting shaking.

【0004】

[Means for solving problems]

The shaking correction method of the portable display device according to the present invention detects the position displacement amount of the portable display device in the world coordinate system for each unit time and the position displacement amount of the observer's head in the world coordinate system for each unit time. Based on the detected position displacement amount of the portable display device per unit time and the position displacement amount of the observer's head per unit time, the image display position between the observer and the portable display device It is characterized in that the image display position of the portable display device is corrected so that the relative position does not change.

【0005】

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

【0006】

FIG. 1 shows the positional relationship between the portable display device and the observer's head.

【0007】

In FIG. 1, Xw, Yw, and Zw indicate the world coordinate system. Further, Xd and Yd indicate a coordinate system (hereinafter, referred to as a display coordinate system) representing a position in the image display area 3 of the portable display device 1.

【0008】

The position of the world coordinate system of the portable display device 1 will be represented by (xwa, ywa, zwa). In addition, the position of the world coordinate system of the observer's head 2 is represented by (xwb, ywb, zwb). Further, the position in the video display area 3 of the portable display device 1 will be represented by (xdp, ydp) in the display coordinate system.

【0009】

First, the amount of position displacement per unit time T of the world coordinate system of the portable display device 1 and the amount of position displacement per unit time T of the world coordinate system of the observer's head 2 are obtained. These positional displacement amounts are measured using an acceleration sensor, a magnetic sensor, an ultrasonic sensor, or the like.

【0010】

It is assumed that the position of the world coordinate system of the portable display device 1 has moved from (xwa, ywa, zwa) to (xwa', ywa', zwa') from a certain time point to a time point t1 after a unit time T has elapsed. In addition, the world coordinate system position of the observer's head 2 has moved from (xwb, ywb, zwb) to (xwb', ywb', zwb') from a certain point in time to a point in time t1 after a unit time T has elapsed. To do.

【0011】

The displacement amounts Δxwa and Δywa of the world coordinate system position of the portable display device 1 can be obtained by the following mathematical formula 1.

【0012】

[Number 1]

Δxwa = xwa'-xwa Δywa = ywa'-ywa [0013]

Further, the displacement amounts Δxwb and Δywb of the position of the observer's head 2 in the world coordinate system can be obtained by the following mathematical formula 2.

【0014】

[Number 2]

Δxwb = xwb'-xwb Δywb = ywb'-ywb [0015]

Then, based on the obtained position displacement amounts Δxwa and Δywa of the portable display device 1 per unit time and the position displacement amounts Δxwb and Δywb of the observer's head 2 per unit time, the portable display device 1 Correct the image display position displayed in.

【0016】

That is, assuming that the video display position of the portable display device 1 at the above time point to is (xdp, ydp) and the video display position at the time point t1 with respect to that position (xdp', ydp'), the video display at the time point t1 The position (xdp', ydp') is obtained by the following equation 3.

【0017】

[Number 3]

xdp'= xdp + Δxwb-Δxwa ydp'= ydp + Δywb-Δywa [0018]

That is, in order to make the image display position follow the movement of the observer's head 2, the displacement amount (Δxwb, Δywb) of the movement of the observer's head 2 is added to the image display position (xdp, ydp), and the portable type The image display position (xdp', ydp') at the time point t1 is obtained by subtracting the displacement amount (Δxwa, Δywa) from the image display position (xdp, ydp) in order to cancel the movement of the display device 1. ..

【0019】

Therefore, at the time point t1, by correcting the image display position from (xdp, ydp) to (xdp', ydp'), the relative position between the observer's head 2 and the image display position of the portable display device 1 Does not change, making it easier to see the image.

【0020】

[Effect of the invention]

According to the present invention, when one or both of the portable display device and the observer's head moves, it is possible to prevent the relative position between the observer and the image display position of the portable display device from changing. A shake correction method for display devices is realized.

[Simple explanation of drawings]

[Figure 1]

It is a schematic diagram which shows the positional relationship between a portable display device and an observer's head.

[Explanation of symbols]

1 Portable display device 2 Observer's head