JPH1069266A - Deflection compensating method of portable display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the relative positional relation constant between an observer and the picture display position of a portable display device by correcting the picture display position based on the displacement per unit time of the display device and that of the head of the observer. SOLUTION: The displacements(Δxwb, Δywb) of the head 2 are added to the picture display position so as to make the picture display position follow the movement of the head 2 of the observer, and the displacements(Δxwa, Δywa) of the portable display device 1 are subtracted from the picture display position. By this the picture display position at a specified time point is determined. Namely, based on the positional displacement(Δxwa, Δywa) and the positional displacement (Δxwb, Δywb), the picture display position displayed on the display device 1 is corrected. By this, the relative position between the head 2 of the observer and the picture display position of the portable display device 1 is not fluctuated to make it easy to watch video pictures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a method for correcting shaking of a portable display device.

[0002]

2. Description of the Related Art When an observer observes an image displayed by a portable display device and one or both of the portable display device and the observer's head move, the observer and the portable display device are moved. There is a problem in that the relative position of the device to the image display position changes, making it difficult to see the image.

[0003]

SUMMARY OF THE INVENTION According to the present invention, when one or both of the portable display device and the observer's head move, the relative position between the observer and the image display position of the portable display device changes. It is an object of the present invention to provide a method for correcting a shake of a portable display device, which can prevent the vibration from occurring.

[0004]

According to the present invention, a shake correction method for a portable display device according to the present invention detects a position displacement amount of a portable display device per unit time in a world coordinate system and detects an observer's head in a world coordinate system. The position displacement amount of the portable display device per unit time is detected based on the detected position displacement amount of the portable display device per unit time and the detected position displacement amount of the observer's head per unit time. The image display position of the portable display device is corrected so that the relative position to the image display position of the portable display device does not change.

[0005]

Embodiments of the present invention will be described below with reference to the drawings.

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

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

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

First, the displacement of the portable display device 1 in the world coordinate system per unit time T and the head 2 of the observer
Of the world coordinate system per unit time T is obtained. These positional displacements are measured using an acceleration sensor, a magnetic sensor, an ultrasonic sensor, or the like.

The position of the world coordinate system of the portable display device 1 is from (xwa, ywa, zwa) to (xwa ', yw) from a point in time to to a point in time t1 after a unit time T has elapsed.
a ′, zwa ′). Further, (xwb, ywb, zw
Suppose that it has moved from b) to (xwb ', ywb', zwb ').

The displacement amounts Δxwa and Δywa of the position of the world coordinate system of the portable display device 1 are obtained by the following equation (1).

[0012]

## EQU1 ## Δxwa = xwa′−xwa Δywa = ywa′−ywa

The displacement amounts Δxwb and Δywb of the position of the observer's head 2 in the world coordinate system are obtained by the following equation (2).

[0014]

Δxwb = xwb′−xwb Δywb = ywb′−ywb

Then, the obtained positional displacement amounts Δxwa and Δywa per unit time of the portable display device 1 are calculated as follows:
Position displacement amount Δxwb of the observer's head 2 per unit time
The video display position displayed on the portable display device 1 is corrected based on and ywb.

That is, the image display position of the portable display device 1 at the time point to is defined as (xdp, ydp), and the image display position (xdp ', yd) at the time point t1 with respect to the position.
p ′), the image display position (xd
p ′, ydp ′) is obtained by the following equation 3.

[0017]

Xdp ′ = xdp + Δxwb−Δxway ydp ′ = ydp + Δywb−Δywa

That is, in order to make the image display position follow the movement of the observer's head 2, the displacement (Δxwb, Δywb) of the movement of the observer's head 2 is changed to the image display position (xdp, yd).
p), and the displacement amount (Δxwa, Δywa) to cancel the movement of the portable display device 1 is displayed on the image display position (xd
By subtracting from (p, ydp), the video display position (xdp ′, ydp ′) at time t1 is obtained.

Therefore, at time t1, the image display position is changed from (xdp, ydp) to (xdp ', yd).
By correcting to p ′), the relative position between the observer's head 2 and the image display position of the portable display device 1 does not change, and the image becomes easy to see.

[0020]

According to the present invention, when one or both of the portable display device and the observer's head move, the relative position between the observer and the image display position of the portable display device changes. A vibration correction method for a portable display device that can prevent the occurrence of a vibration is realized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a positional relationship between a portable display device and an observer's head.

[Explanation of symbols]

 1 portable display device 2 observer's head

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Miho Hoshino 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A portable display device in a world coordinate system which detects an amount of displacement of a portable display device per unit time and a position of an observer's head in a world coordinate system which is detected per unit time. Based on the position displacement amount of the type display device per unit time and the position displacement amount of the observer's head per unit time, so that the relative position between the observer and the image display position of the portable display device does not change, A shaking correction method for a portable display device that corrects an image display position of the portable display device.