HTC Patent | Head-mounted display apparatus

Patent: Head-mounted display apparatus

Publication Number: 20190049722

Publication Date: 2019-02-14

Applicants: HTC

Abstract

A head-mounted display apparatus includes a shell and a first light emitter. The shell has an inner surface. The first light emitter is disposed on the shell. The first light emitter transmits a first projection light beam to the inner surface and causes the first projection light beam to bring out at least one reflection action and a scattering action according to the inner surface to generate a first detection light. The first detection light is projected to a first target region. A first projection surface of the first detection light covers a first pre-set area of the first target region.

Background

The invention relates to a head-mounted display apparatus, and specifically relates to a head-mounted display apparatus generating a uniform light surface on the eyeball by indirect lighting.

In the field of conventional technology, an eye tracking process applied to head-mounted display apparatus is usually carried out by pupil center/corneal reflection (PCCR). In this method, the infrared light is used to generate a plurality of bright spots on a cornea, and the bright spots serve as reference points for positioning. The positions of the bright spots are not changed along with rotation of the cornea, so vector between the bright spots and center of the pupil and coordinate of panel image can be used for mapping, so as to calculate an absolute position where the eyeball gazes. Based on the hardware architecture of the abovementioned principle, an infrared camera is needed to capture the positions of the bright spots on the cornea. However, because of the position that the infrared camera is placed, it is easy to capture secondary bright spots or bright spots formed by stray light, so as to cause decrease in accuracy of pupil tracking.

Summary

The invention provides a head-mounted display apparatus, which is capable of providing a detection light evenly distributed on a target region, so as to reduce the possibility of generating bright spots at the target region.

A head-mounted display apparatus of the invention includes a shell and a first light emitter. The shell has an inner surface. The first light emitter is disposed on the shell. The first light emitter transmits a first projection light beam to the inner surface and causes the first projection light beam to bring out at least one reflection action and a scattering action according to the inner surface to generate a first detection light. The first detection light is projected to the first target region, and the first projection surface of the first detection light covers the first pre-set area of the first target region.

Based on the above description, the light emitter of the invention generates the detection light via making the projection light beam to bring out the at least one reflection action and the scattering action. The detection light is projected to a target region and covers a pre-set area of the target region. As a result, the detection light used for eyeball detection can evenly cover a surface of the eye, so as to reduce the possibility of generating stray light spots.