CN216133290U

CN216133290U - Small-size single LCD projector dodging light path

Info

Publication number: CN216133290U
Application number: CN202122031273.0U
Authority: CN
Inventors: 徐宝山; 吴汉兴
Original assignee: Guangzhou Rigal Electronics Co ltd
Current assignee: Guangzhou Rigal Electronics Co ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2022-03-25
Anticipated expiration: 2031-08-26

Abstract

The utility model discloses a light homogenizing light path of a small single LCD projector, which comprises a light funnel and a collimating lens which are coaxially arranged along the light propagation direction, wherein the light funnel and the collimating lens enable the emergent angle of light to be within 20 degrees. The dodging light path of the small single LCD projector can realize 1080P high-definition imaging with low projection ratio.

Description

Small-size single LCD projector dodging light path

Technical Field

The utility model relates to the field of optical projection, in particular to a light homogenizing light path of a small single LCD projector.

Background

With the increasing application in daily life, the miniaturization of the single-chip LCD projector is a development trend, but in the process of miniaturization of the single-chip LCD projector, due to the unreasonable design and arrangement of optical elements, numerous problems such as low light utilization rate and poor brightness uniformity occur.

Disclosure of Invention

In order to solve the defects of the prior art, the utility model provides a light homogenizing light path of a small single LCD projector, which can realize 1080P high-definition imaging with low projection ratio.

The technical problem to be solved by the utility model is realized by the following technical scheme:

a light homogenizing light path of a small single LCD projector comprises a light funnel and a collimating lens which are coaxially arranged along the light propagation direction, wherein the light funnel and the collimating lens enable the emergent angle of light to be within 20 degrees.

Furthermore, the light inlet of the light funnel is 12-17mm long and 9-13mm wide, the light outlet is 80-120m long and 46-68mm wide, and the distance between the light inlet and the light outlet is 55-82 mm.

Further, the focal length of the collimating lens is between 72mm and 108 mm.

Further, the distance between the collimating lens and the light outlet of the light funnel is within 2 mm.

Further, the LED illumination device also comprises a light source which is coaxially and sequentially arranged at the light inlet of the light funnel along the light propagation direction, and an LCD screen, a focusing lens, a reflector and a projection lens which are coaxially and sequentially arranged at the emergent side of the collimating lens along the light propagation direction.

Further, the distance between the light-emitting side of the LCD screen and the optical axis of the projection lens is between 100 and 132 mm.

Further, the light emitting angle of the light source is 120 °.

Further, the interval between the light inlet of the light funnel and the light emitting surface of the light source is within 1.5 mm.

Further, the focal length of the focusing lens is between 104 and 156 mm.

Further, a heat insulation sheet is coaxially arranged between the collimating lens and the LCD screen, and the surface of the heat insulation sheet is plated with a polarizing film and a brightness enhancement film.

The utility model has the following beneficial effects: this even light path of small-size single LCD projector adopts the light funnel carries out multiple reflection to light, makes light distribution more even, and has reduced the divergence scope of light, then adopts collimating lens carries out collimation processing to light, makes light exit angle further reduce to within 20 to form the good low-angle light of luminance homogeneity and provide LCD screen and image, improve light utilization ratio and the luminance homogeneity of monolithic LCD projector after the miniaturization.

Drawings

FIG. 1 is a schematic diagram of a dodging light path of a small single LCD projector provided by the present invention;

FIG. 2 is a schematic diagram of a light funnel in the dodging path of the compact single LCD projector shown in FIG. 1;

FIG. 3 is a schematic diagram of a collimating lens in the dodging path of the compact single LCD projector shown in FIG. 1;

FIG. 4 is a schematic diagram of a thermal spacer in a dodging light path of the compact single LCD projector shown in FIG. 1;

FIG. 5 is a schematic view of a focusing lens in the dodging path of the compact single LCD projector shown in FIG. 1;

fig. 6 is a schematic diagram of a mirror in the dodging path of the compact single LCD projector shown in fig. 1.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in FIG. 1, the dodging light path of the small single LCD projector comprises a light funnel 2 and a collimating lens 3 which are coaxially arranged along the light propagation direction, wherein the light funnel 2 and the collimating lens 3 enable the emergent angle of light to be within 20 degrees.

This even light path of small-size single LCD projector adopts light funnel 2 carries out multiple reflection to the light, makes light distribution more even, and has reduced the divergence scope of light, then adopts collimating lens 3 carries out collimation processing to the light, makes light exit angle further reduce to within 20 to form the good low-angle light of luminance homogeneity and provide LCD screen 5 and image, improve light utilization ratio and the luminance homogeneity of monolithic LCD projector after the miniaturization.

As shown in fig. 2, the light funnel 2 has a light inlet length L22 of 12-17mm, a width W22 of 9-13mm, a light outlet length L21 of 80-120m, a width W21 of 46-68mm, and a distance H2 between the light inlet and the light outlet of 55-82 mm; the inner surface of the light funnel 2 is plated with a reflecting film which can reflect light so that the light can be emitted more uniformly.

The focal length of the collimating lens 3 is between 72 and 108mm, the distance between the collimating lens 3 and the light outlet of the light funnel 2 is within 2mm, as shown in fig. 3, the length L3 of the collimating lens 3 is between 83.60 and 125.40mm, the width W3 of the collimating lens is between 19.60 and 74.40mm, and the thickness H3 of the collimating lens is between 1.44 and 2.16 mm.

The dodging light path of the small single LCD projector also comprises a light source 1 coaxially and sequentially arranged at the light inlet of the light funnel 2 along the light propagation direction, and a heat insulation sheet 4, an LCD screen 5, a focusing lens 6, a reflector 7 and a projection lens 8 coaxially and sequentially arranged at the emergent side of the collimating lens 3 along the light propagation direction; light rays emitted by the light source 1 are reflected for multiple times in the light funnel 2, then are uniformly incident to the collimating lens 3 for collimation, then are imaged through the LCD screen 5, are focused by the focusing lens 6, are reflected by the reflecting mirror 7 for 90 degrees into the projection lens 8, and finally are amplified by the projection lens 8 and then are projected outwards.

In this embodiment, the collimating lens 3 and the focusing lens 6 are both fresnel lenses and are made of plastic, which not only has cheap material but also has small thickness, and can shorten the light path.

The distance between the light-emitting side of the LCD screen 5 and the optical axis of the projection lens 8 is between 100 and 132 mm.

The light source 1 is a white light LED, preferably but not limited to COB packaging, the power is 80-100W, the length of a light emitting surface is 12-17mm, the width is 9-13mm, and the light emitting angle is 120 degrees.

Wherein, the interval between the light inlet of the light funnel 2 and the light emitting surface of the light source 1 is within 1.5 mm.

The focal length of the focusing lens 6 is between 104-156mm, and as shown in FIG. 5, the width L6 of the focusing lens 6 is between 84.80-127.20mm, the width W6 is between 51.20-76.80mm, and the thickness H6 is between 1.44-2.16 mm.

The size of the LCD screen 5 is 4-5 inches, the resolution is 1920 x 1080 full-color screen, and one pixel point is formed by combining sub-pixels of three colors of RGB.

As shown in fig. 4, the length L4 of the heat insulation sheet 4 is between 77-115mm, the width W4 is between 48-72mm, and the thickness H4 is between 0.80-1.20mm, the surface of the heat insulation sheet is plated with a polarizing film and a brightness enhancement film, the polarizing film can absorb stray light, and the brightness enhancement film can improve the light brightness; the polarizing film and the brightness enhancement film may be laminated on the same surface of the heat insulating sheet 4, or may be respectively laminated on different surfaces of the heat insulating sheet 4.

As shown in fig. 6, the length L7 of the reflector 7 is 93.44-140.16mm, the width is 55.00-82.50mm, the thickness is 2.24-3.36mm, and the reflector is inclined at 45 ° to reflect 90 ° light emitted from the LCD panel 5 and then enter the projection lens 8.

The above-mentioned embodiments only express the embodiments of the present invention, and the description is more specific and detailed, but not understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by using the equivalent substitution or the equivalent transformation should fall within the protection scope of the present invention.

Claims

1. A small-sized single LCD projector dodging light path is characterized by comprising a light funnel and a collimating lens which are coaxially arranged along the light propagation direction, wherein the light funnel and the collimating lens enable the emergent angle of light to be within 20 degrees; the light funnel has a light inlet with a length of 12-17mm and a width of 9-13mm, a light outlet with a length of 80-120m and a width of 46-68mm, and a distance between the light inlet and the light outlet is 55-82 mm; the focal length of the collimating lens is between 72 and 108mm, and the distance between the collimating lens and the light outlet of the light funnel is within 2 mm.

2. The dodging light path of a small single LCD projector as claimed in claim 1, further comprising a light source coaxially and sequentially disposed at the light entrance of said light funnel along the light propagation direction, and an LCD screen, a focusing lens, a reflector and a projection lens coaxially and sequentially disposed at the exit side of said collimating lens along the light propagation direction.

3. The uniform light path for small single LCD projector as claimed in claim 2, wherein the distance between the light-emitting side of the LCD screen and the optical axis of the projection lens is between 100 and 132 mm.

4. The small single LCD projector dodging optical path of claim 2, wherein said light source has an emission angle of 120 °.

5. The small single LCD projector dodging optical path according to claim 2, wherein a distance between the light entrance of said light funnel and the light emitting surface of said light source is within 1.5 mm.

6. The uniform light path for small single LCD projector as claimed in claim 2, wherein the focal length of the focusing lens is between 104 and 156 mm.

7. The dodging device of claim 2, wherein a heat shield is coaxially disposed between said collimating lens and said LCD panel, and a surface of said heat shield is coated with a polarizer film and a brightness enhancement film.