Optical see-through glass type display device and corresponding optical unit
View Patent ↗An optical see-through glass type display device comprises: an optical unit having a front correcting surface and a rear correcting surface; an image projector projecting a virtual image; and an image sensor for capturing an ambient scene image. The optical unit is configured to guide light of the ambient scene image coming through the front correcting surface to the image sensor and to guide light of the virtual image so that the light of the virtual image outgoes through the rear correcting surface. A first optical compensation element is located between the optical unit and the image sensor and a second optical compensation element is located between the image projector and the optical unit. The device further comprises a processing module configured to analyze the ambient scene image captured by the image sensor.
1. An optical see-through glass type display device, comprising:
an optical unit having a front correcting surface and a rear correcting surface, the front correcting surface refracting light from an ambient scene image;
an image projector projecting a virtual image; and
an image sensor,
wherein the optical unit is configured to guide light of the ambient scene image refracted by the front correcting surface to the image sensor and to guide light of the virtual image so that the light of the virtual image outgoes through the rear correcting surface,
wherein a first optical compensation element is located in a light path between the optical unit and the image sensor behind an emission end of the optical unit to compensate for deformation in the ambient scene image due to the front correcting surface and a second optical compensation element is located in a light path between the image projector and the optical unit ahead of an incident end of the optical unit to compensate for deformation in the virtual image due to the rear correcting surface, and
wherein the optical see-through glass type display device further comprises a processing module connected to said image projector and image sensor, said processing module being configured to analyze the ambient scene image received by the image sensor to adjust the image projector to prepare the virtual image to overlay the ambient scene image according to the analysis result of the ambient scene image.
2. The display device according to claim 1 , wherein the processing module is configured to specify a tracked feature in the ambient scene image by the analysis of the ambient scene image and to prepare the virtual image according to a size and position of the tracked feature.
3. The display device according to claim 1 , wherein the first optical compensation element has an optical characteristic to compensate a deformation of an image caused by the front correcting surface and the second optical compensation element has an optical characteristic to compensate a deformation of an image to be caused by the rear correcting surface.
4. The display device according to claim 1 , wherein the optical unit comprises a separating layer, the separating layer is configured to reflect a part of an incoming light and to transmit a part of the incoming light.
5. The display device according to claim 1 , wherein the optical unit including a front plate having the front correcting surface, a rear plate having the rear correcting surface and an intermediate plate arranged between the front and rear plates.
6. The display device according to claim 5 , wherein the first optical compensation element is located in a light path between the front plate and the image sensor and the second optical compensation element is located in a light path between the image projector and intermediate plate.