CN-114253055-B - Projection system

CN114253055BCN 114253055 BCN114253055 BCN 114253055BCN-114253055-B

Abstract

The application discloses a projection system, and belongs to the field of projection equipment. The projection system comprises a light source assembly, an illumination assembly lens assembly and a screen, wherein the light source assembly, the illumination assembly lens assembly and the screen are sequentially arranged along the light path direction, the lens assembly comprises a first mirror group, a second mirror group and a second mirror group, the first mirror group is used for receiving light beams led out by the illumination assembly and guiding the light beams to the first mirror, the second mirror group is used for receiving the light beams reflected by the first mirror and guiding the light beams to the second mirror, and the second mirror group is used for guiding the light beams to the screen. In the projection system provided by the application, the first reflecting mirror is arranged in the lens assembly, and the optical axes of the first lens group and the second lens group in the two lens assemblies are deflected through the first reflecting mirror, so that the maximum size of the lens assembly is reduced, the size of the projection system can be further reduced, the problem of larger size of the projection system in the related art is solved, and the effect of reducing the size of the projection system is achieved.

Inventors

LI XIAOPING
LI WEI

Assignees

青岛海信激光显示股份有限公司

Dates

Publication Date: 20260505
Application Date: 20201111
Priority Date: 20200925

Claims (15)

1. The projection system is characterized by comprising a light source assembly, an illumination assembly, a lens assembly and a screen which are sequentially arranged along the light path direction; the illumination assembly comprises a light valve, and the light beam emitted by the light source assembly is reflected to the lens assembly after passing through the light valve; The lens assembly comprises a first mirror group, a second mirror group and a second mirror group, wherein the first mirror group is used for receiving a light beam led out by the illumination assembly and guiding the light beam to the first mirror, the second mirror group is used for receiving the light beam reflected by the first mirror and guiding the light beam to the second mirror, the second mirror group is used for guiding the light beam to the screen, and the maximum distance between the first mirror group and the second mirror group is smaller than the sum of the length of the first mirror group and the length of the second mirror group; The optical axis of the second lens group is perpendicular to the screen, the optical axis of the first lens group is not parallel to the optical axis of the second lens group, and the second reflecting mirror is located on one side, away from the screen, of the second lens group.
2. The projection system of claim 1 wherein the optical axis of the first lens group is perpendicular to the optical axis of the second lens group.
3. The projection system of claim 1, wherein the illumination assembly further comprises a third mirror, a light homogenizing device, a prism unit, a first lens unit, and a second lens unit; The light homogenizing device is used for homogenizing the light beam emitted by the light source assembly and radiating the light beam to the first lens unit; The first lens unit is used for shaping the received light beam and directing the light beam to the third reflector; The third reflecting mirror is used for reflecting the received light beam to the second lens unit; the second lens unit is used for guiding the received light beam to the prism unit after the received light beam meets the aperture coefficient of the lens assembly; The prism unit is used for guiding the light beam received from the second lens unit to the light valve and guiding the light beam reflected by the light valve out of the illumination assembly.
4.A projection system according to claim 3, wherein a first plane defined by a line of the light axis of the illumination assembly before reflection by the light valve and a line of the light axis of the illumination assembly after reflection by the light valve is non-coplanar with a second plane defined by the optical axes of the first and second mirror groups.
5. The projection system of claim 4 wherein the first plane is perpendicular to the second plane.
6. The projection system of any of claims 1-5 wherein the illumination assembly includes a light valve circuit board electrically coupled to the light valve, the projection system including a display panel electrically coupled to the light valve circuit board.
7. The projection system of claim 6 wherein the display panel is electrically connected to the light valve circuit board by an in-line cable.
8. The projection system of claim 7 wherein the display panel is parallel to the screen and perpendicular to the light valve.
9. The projection system of claim 8, wherein the display panel is positioned on a side of the lens assembly adjacent the screen; The light valve circuit board and the lens assembly are arranged along a first direction, the first direction is parallel to the screen, and the light valve is used for turning over under the drive of a light valve control signal and transmitting light beams to the lens assembly.
10. The projection system of claim 9, further comprising a backplane, wherein the in-line cable comprises a differential signal line, wherein the display panel, the light valve circuit board, and the lens assembly are all positioned on the backplane, and wherein the differential signal line is in contact with the backplane.
11. The projection system of claim 10, further comprising a shielding layer; The shielding layer is wrapped on the outer side of the differential signal line and is grounded.
12. The projection system of claim 11, further comprising a magnetic ring sleeved outside the shielding layer, wherein the magnetic ring has a length less than a length of the shielding layer.
13. The projection system of claim 10 wherein the projection system further comprises a common mode inductance; the common mode inductor is connected in series between the display panel and the light valve circuit board through the differential signal line.
14. The projection system of any of claims 9 to 13 wherein the distance between the display panel and the light valve circuit board is determined based on the communication rate between the light valve drive assembly in the display panel and the light valve.
15. The projection system of claim 14 wherein the communication rate between the light valve drive assembly and the light valve is less than or equal to 1.6 gigabits per second and the distance between the display panel and the light valve circuit board is less than or equal to 254 millimeters.

Description

Projection system The present application claims priority from chinese patent application number 202011025334.6, entitled "projection system," filed on 9/25/2020, the entire contents of which are incorporated herein by reference. Technical Field The present disclosure relates to the field of projection devices, and more particularly, to a projection system. Background The projection television is a novel television which is rapidly developed in recent years, and has the advantages of large imaging picture, high spectrum brightness, wide display color gamut and the like. Projection systems for projection televisions include an optical engine including a light source assembly, an illumination assembly, and a lens assembly, and a screen, wherein the size of the optical engine is an important factor affecting the wide range of applications for projection televisions. An optical engine of projection system is composed of light source, lighting unit for processing light beam and directing it to lens, and lens for directing the received light beam to screen of projection TV. However, in the optical engine of the projection system, the longer size of the lens may result in the larger size of the optical engine, which in turn results in the larger size of the projection system. Disclosure of Invention The embodiment of the application provides a projection system. The technical scheme is as follows: according to a first aspect of the present application, there is provided a projection system including a light source assembly, an illumination assembly, and a lens assembly disposed in order along an optical path direction; The lens assembly comprises a first mirror group, a second mirror group and a second mirror group, wherein the first mirror group is used for receiving a light beam led out by the illumination assembly and guiding the light beam to the first mirror, the second mirror group is used for receiving the light beam reflected by the first mirror and guiding the light beam to the second mirror, the second mirror is used for guiding the light beam to a screen, and the maximum distance between the first mirror group and the second mirror group is smaller than the sum of the length of the first mirror group and the length of the second mirror group. Optionally, an optical axis of the second lens group is perpendicular to the screen. Optionally, the optical axis of the first lens group is perpendicular to the optical axis of the second lens group. Optionally, the illumination assembly includes a third reflector, a light homogenizing device, a light valve, a prism unit, a first lens unit, and a second lens unit; The light homogenizing device is used for homogenizing the light beam emitted by the light source assembly and radiating the light beam to the first lens unit; The first lens unit is used for shaping the received light beam and directing the light beam to the third reflector; The third reflecting mirror is used for reflecting the received light beam to the second lens unit; the second lens unit is used for guiding the received light beam to the prism unit after the received light beam meets the aperture coefficient of the lens assembly; The prism unit is used for guiding the light beam received from the second lens unit to the light valve and guiding the light beam reflected by the light valve out of the illumination assembly. Optionally, a first plane defined by a line of the light axis of the illumination assembly before being reflected by the light valve and a line of the light axis of the illumination assembly after being reflected by the light valve is not coplanar with a second plane defined by the optical axis of the first lens group and the optical axis of the second lens group. Optionally, the first plane is perpendicular to the second plane. Optionally, the illumination assembly includes a light valve circuit board electrically connected to the light valve, and the projection system includes a display panel electrically connected to the light valve circuit board. Optionally, the display panel is electrically connected to the light valve circuit board through an in-line cable. Optionally, the display panel is parallel to the screen and perpendicular to the light valve. Optionally, the display panel is located at a side of the lens assembly close to the screen; the light valve circuit board and the lens assembly are arranged along a first direction, the first direction is parallel to the screen, and the light valve is used for overturning under the drive of the light valve control signal and transmitting light beams to the lens assembly. Optionally, the projection system further comprises a bottom plate, the straight flat cable comprises differential signal wires, the display panel, the light valve circuit board and the lens assembly are all located on the bottom plate, and the differential signal wires are in contact with the bottom plate. Optionally, the projection system further comprises a sh