# US 2025/0155705 A1 · Head-up display device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0155705 A1 - Document ID: US20250155705A1 - Status: Published application - Kind: A1 - Application number: 18/945,568 - Filed: 2024-11-13 - Published: 2025-05-15 - Earliest claimed: 2023-11-14 - Assignees: Coretronic Corporation - Applicants: Coretronic Corporation - Inventors: Kuei-En Peng; Tao-Hung Kuo; Yi-Tien Lu; Po-Che Lee - Web page: https://patentgrep.com/patent/US20250155705A1 ## CPC - G02B 27/0101: {characterised by optical features (G02B27/0172 takes precedence)} - G02B 27/0062: {by controlling the dispersion of a lens material, e.g. adapting the relative partial dispersion} - G02B 2027/011: {comprising device for correcting geometrical aberrations, distortion} - G02B 2027/0116: {comprising devices for correcting chromatic aberration} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract Disclosed is a head-up display device which includes a projection module and an image light transmission module. The projection module includes an image light source and a projection lens. The image light source is disposed to provide an image beam. The projection lens has a lateral chromatic aberration of a projection lens. The image light transmission module includes an optical waveguide element and an optical lens and has a lateral chromatic aberration of an image light transmission. The optical waveguide element is disposed on a transmission path of the image beam from the projection lens and guides the image beam to form a display beam. The lateral chromatic aberration of the projection lens is a reverse chromatic aberration. The lateral chromatic aberration of the image light transmission module is a positive chromatic aberration. The head-up display device disclosed makes the display image have good optical quality. ## Claims ### Claim 1 A head-up display device, comprising: a projection module, comprising an image light source and a projection lens, wherein the image light source is disposed to provide an image beam, the projection lens is disposed on a transmission path of the image beam, and the projection lens has a lateral chromatic aberration of the projection lens; and an image light transmission module, having a lateral chromatic aberration of the image light transmission module, wherein the image light transmission module comprises: an optical waveguide element, disposed on the transmission path of the image beam from the projection lens, and guiding the image beam to form a display beam; and an optical lens, disposed on a transmission path of the display beam from the optical waveguide element, wherein the lateral chromatic aberration of the projection lens is a reverse chromatic aberration, and the lateral chromatic aberration of the image light transmission module is a positive chromatic aberration. ### Claim 2 (depends on 1) The head-up display device according to claim 1, wherein the projection lens comprises at least two first lens elements and at least one second lens element, and an Abbe number of each of the at least one second lens element is less than 25. ### Claim 3 (depends on 2) The head-up display device according to claim 2, wherein an average Abbe number of the at least two first lens elements is more than two times as an average Abbe number of the at least one second lens element. ### Claim 4 (depends on 2) The head-up display device according to claim 2, wherein a number of the at least one second lens element is plural, and there is at least one of the at least two first lens elements between the adjacent at least one second lens element. ### Claim 5 (depends on 2) The head-up display device according to claim 2, wherein the projection lens is composed of the at least two first lens elements and the at least one second lens element, a number of the at least two first lens elements is five, and a number of the at least one second lens element is two. ### Claim 6 (depends on 1) The head-up display device according to claim 1, wherein the image beam forms an image with a plurality of image pixels, the image has the lateral chromatic aberration of the projection lens, and a width of the lateral chromatic aberration of the projection lens is greater than a width of one of the plurality of image pixels. ### Claim 7 (depends on 6) The head-up display device according to claim 6, wherein the display beam passing through the optical lens forms a display image, the display image has a lateral chromatic aberration of the head-up display device, and the lateral chromatic aberration of the head-up display device is less than the lateral chromatic aberration of the projection lens. ### Claim 8 (depends on 7) The head-up display device according to claim 7, wherein the display image has a plurality of display pixels, and the width of the lateral chromatic aberration of the head-up display device is smaller than a width of one of the plurality of display pixels. ### Claim 9 (depends on 1) The head-up display device according to claim 1, wherein the optical waveguide element comprises a light entrance area and a light exit area, the projection module is arranged corresponding to the light entrance area, and the optical lens is arranged corresponding to the light exit area. ### Claim 10 (depends on 9) The head-up display device according to claim 9, wherein the optical waveguide element comprises a first surface, a second surface, and a lateral surface, the lateral surface is connected between the first surface and the second surface, and the light entrance area and the light exit area are disposed on the first surface and the second surface respectively. ### Claim 11 (depends on 9) The head-up display device according to claim 9, wherein there is no reflective element between the optical lens and the light exit area. ### Claim 12 (depends on 1) The head-up display device according to claim 1, wherein the optical lens is a free-form surface lens. ### Claim 13 (depends on 2) The head-up display device according to claim 2, wherein at least one of the at least one second lens element is a positive lens.