CN-121995627-A - Head-mounted display and display module for head-mounted display

CN121995627ACN 121995627 ACN121995627 ACN 121995627ACN-121995627-A

Abstract

The application discloses a head-mounted display and a display module for the head-mounted display, which comprise an infrared emitter, an imaging device, a color combining prism, a polarization reflection assembly and at least one visible light luminous panel, wherein the infrared emitter is configured to emit infrared light, the imaging device is configured to receive infrared light reflected by human eyes for imaging, the color combining prism comprises a first surface and a second surface, the first surface is opposite to the second surface, the infrared emitter is opposite to the first surface, the imaging device is opposite to the second surface, the polarization reflection assembly is arranged in the color combining prism and is used for guiding the infrared light emitted from the first surface to emit from a third surface of the color combining prism and guiding the infrared light reflected by the human eyes to emit from the second surface, and the visible light luminous panel is arranged on the surface outside the first surface, the second surface and the third surface of the color combining prism and is used for deflecting the light emitted by the visible light luminous panel and emitting from the third surface to image in human eyes. The eye movement tracking and the display imaging are integrated into one display module, so that the system complexity is low.

Inventors

ZHENG SHUJIN
ZHAO LEI
Chai Chengzhe
WANG CHAOHAO
YUAN ZE

Assignees

甬江实验室

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (11)

1. A display module for a head mounted display, comprising: an infrared emitter configured to emit infrared light; An imaging device configured to receive infrared light reflected by a human eye for imaging; The color combining prism comprises a first surface and a second surface, the first surface is opposite to the second surface, the infrared emitter is arranged opposite to the first surface, and the imaging device is arranged opposite to the second surface; The polarization reflection assembly is arranged in the color combining prism and used for guiding infrared light which is emitted from the first surface to emit from the third surface of the color combining prism and guiding infrared light which is reflected by human eyes to emit from the second surface; The visible light emitting panel is arranged on the surface outside the first surface, the second surface and the third surface of the color combining prism, and the color combining prism is used for deflecting light emitted by the visible light emitting panel and emitting the light from the third surface so as to image in human eyes.
2. The display module for a head mounted display of claim 1, wherein the visible light emitting panel comprises a first visible light emitting panel, a second visible light emitting panel, and a third visible light emitting panel configured to emit light of different wavelengths; The color combining prism further comprises a fourth surface, a fifth surface and a sixth surface, the first visible light emitting panel, the second visible light emitting panel and the third visible light emitting panel are respectively arranged in one-to-one correspondence with the fourth surface, the fifth surface and the sixth surface, and the color combining prism is used for deflecting light emitted by the first visible light emitting panel, the second visible light emitting panel and the third visible light emitting panel and emitting the light from the third surface.
3. The display module for a head-mounted display according to claim 1 or 2, wherein the polarization reflection assembly includes a polarization reflector including a first reflection surface opposite to the first surface and a second reflection surface opposite to the second surface, a phase retarder and an infrared reflection film, the polarization reflector transmitting a first linearly polarized light of a first preset polarization angle and reflecting a second linearly polarized light of a second preset polarization angle, the phase retarder and the infrared reflection film being laminated on a surface opposite to the third surface in the color combiner prism, wherein infrared light incident from the first surface is the second linearly polarized light.
4. A display module for a head-mounted display according to claim 3, wherein the first reflecting surface of the polarizing reflector is configured to reflect the infrared light incident from the first surface to the retarder, and the infrared light passing through the retarder is reflected by the infrared reflecting film and then sequentially passes through the retarder and the polarizing reflector to be directed to the third surface; infrared light incident from the third surface is reflected by the polarizing reflector toward the imaging device.
5. A display module for a head mounted display according to claim 3 or 4, wherein the phase retarder is a 1/4 phase retarder.
6. The display module for a head mounted display of any one of claims 1-5, further comprising a collimating lens through which light exiting the third surface exits.
7. The display module for a head mounted display of claim 1, further comprising: The waveguide device comprises a first grating and a second grating, the first grating and the third surface are oppositely arranged, and the second grating is opposite to the human eye.
8. The display module for a head mounted display of claim 7, wherein the first grating has an area smaller than an area of the second grating.
9. The display module for a head mounted display of claim 7, wherein the waveguide device further comprises a third grating for deflecting infrared light incident from the first grating or the second grating such that infrared light propagates between the first grating and the second grating.
10. The display module for a head mounted display of any of claims 7-9, wherein the first and second gratings comprise at least one of a volume holographic grating, a surface relief grating, a geometric element.
11. A head mounted display, comprising: a first display and a second display, each comprising a display module for a head mounted display according to any one of claims 1 to 10.

Description

Head-mounted display and display module for head-mounted display Technical Field The application relates to the technical field of augmented reality, in particular to a head-mounted display and a display module for the head-mounted display. Background Currently, in Extended Reality (XR), eye tracking is generally performed on human eyes by an iris reflection method, that is, an infrared LED light source (LIGHT EMITTING Diode) is used to light and mark the human eyes, and then an infrared camera is used to take a picture of the human eyes so as to track the movement of the human eyes. But limited by the field of view of the infrared camera, two cameras are typically required to capture images in an iris reflex method, resulting in a larger size display device. Disclosure of Invention The embodiment of the application provides a head-mounted display and a display module for the head-mounted display, which can reduce the volume of equipment during eye movement tracking. The display module comprises an infrared emitter, an imaging device, a color combining prism and a polarization reflection assembly, wherein the infrared emitter is configured to emit infrared light, the imaging device is configured to receive infrared light reflected by human eyes to image, the color combining prism comprises a first surface and a second surface, the first surface is opposite to the second surface, the infrared emitter is arranged opposite to the first surface, the imaging device is arranged opposite to the second surface, the polarization reflection assembly is arranged in the color combining prism and is used for guiding the infrared light emitted from the first surface to emit from the third surface of the color combining prism and guiding the infrared light reflected by the human eyes to emit from the second surface, and the at least one visible light luminous panel is arranged on the surface outside the first surface, the second surface and the third surface of the color combining prism and is used for deflecting light emitted by the visible light luminous panel and emitting from the third surface to image in the human eyes. In some embodiments, the visible light emitting panel includes a first visible light emitting panel, a second visible light emitting panel, and a third visible light emitting panel, where the first visible light emitting panel, the second visible light emitting panel, and the third visible light emitting panel are configured to emit light with different wavelengths, the color combining prism further includes a fourth surface, a fifth surface, and a sixth surface, and the first visible light emitting panel, the second visible light emitting panel, and the third visible light emitting panel are disposed in one-to-one correspondence with the fourth surface, the fifth surface, and the sixth surface, respectively, and the color combining prism is configured to deflect light emitted by the first visible light emitting panel, the second visible light emitting panel, and the third visible light emitting panel, and emit the light from the third surface. In some embodiments, the polarizing reflection assembly comprises a polarizing reflector, a phase delay plate and an infrared reflection film, wherein the polarizing reflector comprises a first reflection surface and a second reflection surface, the first reflection surface is opposite to the first surface, the second reflection surface is opposite to the second surface, the polarizing reflector transmits first linearly polarized light with a first preset polarization angle and reflects second linearly polarized light with a second preset polarization angle, the phase delay plate and the infrared reflection film are stacked on the surface opposite to the third surface in the color combining prism, and infrared light incident from the first surface is the second linearly polarized light. In some embodiments, the first reflecting surface of the polarizing reflector is configured to reflect the infrared light incident from the first surface to the retarder, and after the infrared light passing through the retarder is reflected by the infrared reflecting film, the infrared light passes through the retarder and the polarizing reflector in order to be directed to the third surface, and the infrared light incident from the third surface is reflected by the polarizing reflector to be directed to the imaging device. In some embodiments, the phase retarder is a 1/4 phase retarder. In some embodiments, the display module further includes a collimating lens through which light emitted from the third surface exits. In some embodiments, the display module further comprises a waveguide device comprising a first grating and a second grating, the first grating and the third surface being disposed opposite, the second grating being opposite the human eye. In certain embodiments, the area of the first grating is smaller than the area of the second grating. In some embodiments, th