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EP-4435491-B1 - DISPLAY DEVICE AND VEHICLE

EP4435491B1EP 4435491 B1EP4435491 B1EP 4435491B1EP-4435491-B1

Inventors

  • WANG, Mengran
  • PENG, Haijun

Dates

Publication Date
20260506
Application Date
20220914

Claims (13)

  1. A display apparatus (800), comprising: a projection module (801), configured to project a first path of imaging light to a deflection reflection component (802); the deflection reflection component, configured to: reflect the first path of imaging light to generate at least two paths of imaging sub-light, and respectively reflect the at least two paths of imaging sub-light to a prism group (830) at at least two angles; and the prism group, configured to: enable the at least two paths of imaging sub-light to propagate in the prism group through different paths, and emit the at least two paths of imaging sub-light, and characterised in that : the deflection reflection component is configured to reflect the first path of imaging light to the prism group at a first moment at a first angle, to form a first path of imaging sub-light; the deflection reflection component is configured to reflect the first path of imaging light to the prism group at a second moment at a second angle, to form a second path of imaging sub-light; and the first path of imaging light projected by the projection module at the first moment and the first path of imaging light projected by the projection module at the second moment respectively carry different images.
  2. The apparatus according to claim 1, wherein the prism group comprises a first prism and a second prism; the first prism is configured to: totally reflect, to a reflective surface of the deflection reflection component, the first path of imaging light projected by the projection module, and transmit the at least two paths of imaging sub-light reflected by the deflection reflection component; and the second prism is configured to: transmit first imaging sub-light that is in the at least two paths of imaging sub-light and that is from the first prism, and reflect second imaging sub-light that is in the at least two paths of imaging sub-light and that is from the first prism, so that the second imaging sub-light is emitted from the second prism.
  3. The apparatus according to claim 2, wherein the first prism comprises a first prism surface, a second prism surface, and a third prism surface; the first path of imaging light projected by the projection module transmits through the first prism surface, is totally reflected by the second prism surface, and then is emitted from the third prism surface; and the at least two paths of imaging sub-light reflected by the deflection reflection component transmit through the third prism surface and the second prism surface.
  4. The apparatus according to claim 2 or 3, wherein the second prism comprises a fourth prism surface, a fifth prism surface, and a sixth prism surface; the first imaging sub-light that is in the at least two paths of imaging sub-light and that is emitted by the first prism transmits through the fourth prism surface, and is emitted from the sixth prism surface; and the second imaging sub-light that is in the at least two paths of imaging sub-light and that is emitted by the first prism transmits through the fourth prism surface, is reflected by the fifth prism surface, and then is emitted from the sixth prism surface.
  5. The apparatus according to claim 4, wherein the second prism surface of the first prism is parallel to the fourth prism surface of the second prism.
  6. The apparatus according to claim 1, wherein the prism group comprises a third prism, a fourth prism, and a fifth prism; the third prism is configured to: totally reflect, to a reflective surface of the deflection reflection component, the first path of imaging light projected by the projection module, and transmit the at least two paths of imaging sub-light reflected by the deflection reflection component; the fourth prism is configured to: transmit first imaging sub-light that is in the at least two paths of imaging sub-light and that is from the third prism, and transmit second imaging sub-light that is in the at least two paths of imaging sub-light and that is from the fifth prism; and the fifth prism is configured to: reflect the second imaging sub-light that is in the at least two paths of imaging sub-light and that is from the third prism, and enable the second imaging sub-light to be emitted from the fifth prism to the fourth prism.
  7. The apparatus according to claim 6, wherein the third prism comprises a first prism surface, a second prism surface, and a third prism surface; the first path of imaging light projected by the projection module transmits through the first prism surface of the third prism, is totally reflected by the second prism surface of the third prism, and then is emitted from the third prism surface of the third prism; and the at least two paths of imaging sub-light reflected by the deflection reflection component transmit through the third prism surface of the third prism and the second prism surface of the third prism at at least two angles.
  8. The apparatus according to claim 6 or 7, wherein the fourth prism comprises a fourth prism surface, a fifth prism surface, and a sixth prism surface; the first imaging sub-light that is in the at least two paths of imaging sub-light and that is emitted by the third prism transmits through the fourth prism surface of the fourth prism, and is emitted from the fifth prism surface of the fourth prism; and the second imaging sub-light that is in the at least two paths of imaging sub-light and that is emitted by the third prism transmits through the sixth prism surface of the fourth prism, and is emitted from the fifth prism surface of the fourth prism.
  9. The apparatus according to any one of claims 6 to 8, wherein the fifth prism comprises a seventh prism surface, an eighth prism surface, and a ninth prism surface; and the second imaging sub-light that is in the at least two paths of imaging sub-light and that is emitted by the third prism transmits through the seventh prism surface of the fifth prism, is reflected by the eighth prism surface of the fifth prism and the ninth prism surface of the fifth prism, and then is emitted from the eighth prism surface.
  10. The apparatus according to claim 9, wherein the second prism surface of the third prism is parallel to the fourth prism surface of the fourth prism; and the second prism surface of the third prism is parallel to the seventh prism surface of the fifth prism.
  11. The apparatus according to claim 1, wherein the deflection reflection component comprises a first reflection region and a second reflection region; the first reflection region is used to reflect a part of a light beam of the first path of imaging light to the prism group at a first angle, to form a first path of imaging sub-light; and the second reflection region is used to reflect the other part of the light beam of the first path of imaging light to the prism group at a second angle, to form a second path of imaging sub-light.
  12. The apparatus according to any one of claims 1 to 11, wherein the apparatus further comprises: a spatial imaging module, configured to generate at least two images based on the at least two paths of imaging sub-light from the prism group.
  13. A transportation means, comprising the display apparatus according to any one of claims 1 to 12.

Description

TECHNICAL FIELD Embodiments of this application relate to the field of display technologies and the field of intelligent automobile driving technologies, and more specifically, to a display apparatus. BACKGROUND Automobiles have become an indispensable transportation means in daily lives of people. As a quantity of automobile increases, traffic accidents occur more frequently. To improve driving safety, a head-up display (head-up display, HUD), especially an augmented reality head-up display (augmented reality head-up display, AR-HUD), has been extensively researched. The AR-HUD can project, to a front windshield of an automobile, some important information required by a driver during driving. A displayed virtual image and a real scene around the automobile are fused. Light fused with the real scene is reflected and injected into the driver's eyes. In this way, the driver can see the virtual image fused with the real scene, and does not need to look down at a meter. The driver's eyes always look at a road ahead. This reduces impact of looking down on safe driving. To achieve effect of augmented reality, a current augmented reality head-up display generally needs two or more picture generation units (picture generation units, PGUs) to provide a plurality of images. This causes the AR-HUD to have a large size and high costs. Therefore, how to reduce a size and costs of the HUD and improve display effect is an urgent problem to be resolved. US 2014/118701 A1 discloses a projection apparatus capable of projecting a first image and a second image. SUMMARY This application provides a display apparatus and a transportation means. The display apparatus has a simple light path structure, can improve image generation quality, and is more compact in size. According to a first aspect of the invention, a display apparatus is provided as set out in appended claim 1. The apparatus includes a projection module, a deflection reflection component, and a prism group. The projection module is configured to project a first path of imaging light to the deflection reflection component. The deflection reflection component is configured to: reflect the first path of imaging light to generate at least two paths of imaging sub-light, and respectively reflect the at least two paths of imaging sub-light to the prism group at at least two angles. The prism group is configured to: enable the at least two paths of imaging sub-light to propagate in the prism group through different paths, and emit the at least two paths of imaging sub-light. Based on the foregoing solution, the display apparatus provided in this application splits, through the deflection reflection component, one path of imaging light into at least two paths of imaging sub-light, and changes, through the prism group, optical paths of the at least two paths of imaging light, so that different imaging sub-light can be imaged on different focal planes, to form at least two images and to implement multi-image display effect. With reference to the first aspect, in some implementations of the first aspect, the prism group includes a first prism and a second prism. The first prism is configured to: totally reflect, to a reflective surface of the deflection reflection component, the first path of imaging light projected by the projection module, and transmit the at least two paths of imaging sub-light reflected by the deflection reflection component. The second prism is configured to: transmit first imaging sub-light that is in the at least two paths of imaging sub-light and that is from the first prism, and reflect second imaging sub-light that is in the at least two paths of imaging sub-light and that is from the first prism, so that the second imaging sub-light is emitted from the second prism. Based on the foregoing solution, the display apparatus provided in this application changes, through the prism group including the two prisms, the optical path of the imaging sub-light emitted by the deflection reflection component. To be specific, the first imaging sub-light is enabled to transmit through the first prism and the second prism, and the second imaging sub-light is enabled to transmit through the first prism, and to be reflected in and to be emitted from the second prism. This process does not need to be controlled by precision machinery, and has no risk of image crosstalk. This improves imaging reliability. With reference to the first aspect, in some implementations of the first aspect, the first prism includes a first prism surface, a second prism surface, and a third prism surface. The first path of imaging light projected by the projection module transmits through the first prism surface, is totally reflected by the second prism surface, and then is emitted from the third prism surface. The at least two paths of imaging sub-light reflected by the deflection reflection component transmit through the third prism surface and the second prism surface. With reference to the