CN212694237U

CN212694237U - Light angle control module and single-chip LCD projector

Info

Publication number: CN212694237U
Application number: CN202021474188.0U
Authority: CN
Inventors: 徐宝山; 林汉龙
Original assignee: Guangzhou Rigal Electronics Co ltd
Current assignee: Guangzhou Rigal Electronics Co ltd
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2021-03-12
Anticipated expiration: 2030-07-23

Abstract

The utility model discloses a light angle control module, including an at least light funnel and focusing lens, focusing lens locates the light-emitting port department of all light funnels, just the length h of light funnel, the minor face length an of light-emitting port, go into the minor face length b of light-emitting port and satisfy the formula between focusing lens's the focus f: [ (a-b) × f ]/a > h > f. The light angle control module can reduce the uncontrollable light angles, improve the picture light effect and reduce the size of the projection system. The utility model also discloses a monolithic LCD projector.

Description

Light angle control module and single-chip LCD projector

Technical Field

The utility model relates to a light angle control module and monolithic LCD projector.

Background

At present, in the market, a small-sized LCD screen is usually adopted by a single-chip LCD projector to obtain a projected image, and the light utilization rate is reduced and the brightness and the illumination of the whole light are influenced because the light emitting angle of a light source module is larger.

SUMMERY OF THE UTILITY MODEL

In order to solve the deficiencies of the prior art, the utility model provides a light angle control module can reduce uncontrollable light angle, improves the picture light efficiency and reduces the projection system size.

The utility model also provides a monolithic LCD projector.

The utility model discloses the technical problem that will solve realizes through following technical scheme:

the utility model provides a light angle control module, includes an at least light funnel and focusing lens, focusing lens locates the light-emitting outlet department of all light funnels, just the length h of light funnel, the minor face length a of light-emitting outlet, go into the minor face length b of light-emitting outlet and satisfy the formula between focusing lens's the focus f: [ (a-b) × f ]/a > h > f.

Further, when the number of the light funnels is two or more, the two or more light funnels are located on the same plane.

Further, the focusing lens is a fresnel lens.

A single-chip LCD projector comprises a light source module, the light ray angle control module, an LCD screen, a collimating lens and an imaging lens which are sequentially distributed along the path of light rays.

Further, when the number of the light funnels is one, the light source module includes a light emitting element.

Further, when the number of the light funnels is two or more, the light source module includes a light emitting array, the light emitting array has m rows of light emitting elements along a long side and n columns of light emitting elements along a short side, the light emitting elements and the light funnels are in one-to-one correspondence, wherein m is greater than or equal to 2, n is greater than or equal to 1, and the formula is satisfied: m: n = g: and h, wherein g is the length of the long side of the LCD screen, and h is the length of the short side of the LCD screen.

Furthermore, the light source module further comprises a substrate, and the light emitting element is arranged on the substrate.

Further, the focal length d of the collimating lens, the distance c from the LCD screen to the collimating lens, and the rear working distance i of the imaging lens satisfy the following formula: c is more than or equal to i-d.

Further, the device also comprises a reflecting mirror positioned between the collimating lens and the imaging lens.

Further, the collimating lens is a fresnel lens.

The utility model discloses following beneficial effect has: this monolithic LCD projector will light funnel and the synthetic light angle control module of focusing lens come control the light angle that light source module sent, through rational configuration the size of light funnel and the optical parameter of focusing lens improves the gathering degree of light to reduce uncontrollable light angle, obtain better light luminance and illuminance homogeneity, improve the picture light efficiency and reduce projection system size.

Drawings

Fig. 1 is a schematic diagram of a single-chip LCD projector according to the present invention;

fig. 2 is a schematic diagram of another light source module and a light angle control module provided by the present invention;

fig. 3 is a schematic view of a light funnel provided by the present invention;

fig. 4 is a schematic view of a light source module provided by the present invention;

fig. 5 is a schematic diagram of an LCD screen provided by the present invention.

Detailed Description

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

As shown in fig. 1, a monolithic LCD projector includes light source module 1, light angle control module 2, thermal-insulated glass 3, LCD screen 4, collimating lens 5, reflection lens 6 and imaging lens 7 that distribute along the light path in proper order, the light that light source module 1 sent incides to in the light angle control module 2, the warp the light angle control module 2's internal processing back outgoing extremely LCD screen 4 is in order to form the projection image, the projection image passes through in proper order collimating lens 5 collimates, reflection lens 6 carries out 45 reflection and imaging lens 7 enlargies the back projection.

The light angle control module 2 includes at least one light funnel 21 and a focusing lens 22, as shown in fig. 2, when the number of the light funnels 21 is two or more, the two or more light funnels 21 are located on the same plane; the focusing lens 22 is arranged at the light outlet of all the light funnels 21 and is fixedly sealed with the light outlet of all the light funnels 21 in a bonding mode; as shown in fig. 3, the light funnel 21 has a light inlet and a light outlet opposite to each other along an axis, the light inlet of the light funnel 21 is smaller than the light outlet, and a light gathering reflective layer is disposed in a connecting wall between the light inlet and the light outlet, the light inlet of the light funnel 21 is rectangular, and has a pair of short sides and a pair of long sides, similarly, the light outlet of the light funnel 21 is also rectangular, and also has a pair of short sides and a pair of long sides, the short sides of the light inlet correspond to the short sides of the light outlet, and the long sides of the light inlet correspond to the long sides of the light outlet; the length h of the light funnel 21, the length a of the short side of the light outlet, the length b of the short side of the light inlet and the focal length f of the focusing lens 22 satisfy the following formula: [ (a-b) × f ]/a > h > f.

This monolithic LCD projector will light funnel 21 and focusing lens 22 make up into a light angle control module 2 and control the light angle that light source module 1 sent, through rational configuration the size of light funnel 21 and focusing lens 22's optical parameter improves the gathering degree of light to reduce uncontrollable light angle, obtain better light luminance and illuminance homogeneity, improve the picture light efficiency and reduce projection system size.

As shown in fig. 1, when the number of the light funnels 21 is one, the light source module 1 includes a light emitting element 12, and in this case, the light emitting element 12 preferably adopts a COB light source.

As shown in fig. 2, when the number of the light funnels 21 is two or more, as shown in fig. 4, the light source module 1 includes a light emitting array, the light emitting array has m rows of light emitting elements 12 along a long side and n columns of light emitting elements 12 along a short side, the light emitting elements 12 and the light funnels 21 are in one-to-one correspondence, where m is greater than or equal to 2, n is greater than or equal to 1, and the formula is satisfied: m: n = g: h, as shown in fig. 5, g in the formula is the length of the long side of the LCD screen 4, and h is the length of the short side of the LCD screen 4; in this case, the light emitting element 12 is preferably an LED light source.

The light source module 1 further comprises a substrate 12, the light emitting element 12 is arranged on the substrate 12, and the light source module 1 is fixedly sealed at the light inlet of all the light funnels 21 by the substrate 12.

The focal length d of the collimating lens 5, the distance c from the LCD screen 4 to the collimating lens 5 and the rear working distance i of the imaging lens 7 satisfy the formula: c is more than or equal to i-d.

The single-chip LCD projector also reasonably adjusts the distance from the LCD screen 4 to the collimating lens 5 according to the optical parameters of the collimating lens 5 and the imaging lens 7, so that the collimating lens 5 and the imaging lens 7 are matched for imaging to form a combined focus, the position from the LCD screen 4 to the collimating lens 5 is not less than the combined focus, the production is put into low cost, and a high optical effect is achieved.

The focusing lens 22 and the collimating lens 5 are both Fresnel lenses and are made of plastic materials; the imaging lens 7 is composed of two aspheric lenses 71, and the aspheric lenses 71 are made of PMMA (acrylic).

In the single-chip LCD projector according to an embodiment of the present invention, the light angle control module 2 employs a single light funnel 21, and the light source module 1 also employs a single light emitting element 12, which has the following specific dimensions: the size of a light inlet of the light funnel 21 is 6-8mm 9-11mm, namely the length b of a short side of the light inlet is 6-8mm, the size of a light outlet of the light funnel 21 is 32-34mm 57-59mm, namely the length a of the short side of the light outlet is 32-34mm, the length h of the light funnel 21 is 43-46mm, the focal length f of the focusing lens 22 is 40-60mm, the size of the heat insulation glass 3 is 30-40mm 60-65mm, the size of the LCD screen 4 is 2-3inch, the focal length d of the collimating lens 5 is 80-100mm, and the focal length of the imaging lens 7 is 90-100 mm; the LCD screen 4 is located at the combined focus of the collimating lens 5 and the imaging lens 7.

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

Claims

1. The utility model provides a light angle control module, its characterized in that includes an at least light funnel and focusing lens, focusing lens locates the light-emitting port department of all light funnels, just the length h of light funnel, the minor face length a of light-emitting port, go into the minor face length b of light-emitting port and satisfy the formula between focusing lens's the focus f: [ (a-b) × f ]/a > h > f.

2. The light angle control module of claim 1, wherein when the number of the light funnels is two or more, the two or more light funnels are located on the same plane.

3. A ray angle control module according to claim 1 or 2, wherein the focusing lens is a fresnel lens.

4. A single-chip LCD projector comprising a light source module, a light angle control module as claimed in any one of claims 1 to 3, an LCD screen, a collimating lens and an imaging lens, which are sequentially arranged along a light path.

5. The monolithic LCD projector as recited in claim 4, wherein when the number of the light funnels is one, the light source module includes a light emitting element.

6. The single-chip LCD projector as claimed in claim 4, wherein when the number of the light funnels is two or more, the light source module comprises a light emitting array having m rows of light emitting elements along a long side and n columns of light emitting elements along a short side, the light emitting elements and the light funnels are in one-to-one correspondence, wherein m is greater than or equal to 2, n is greater than or equal to 1, and the formula is satisfied: m: n = g: and h, wherein g is the length of the long side of the LCD screen, and h is the length of the short side of the LCD screen.

7. The single-chip LCD projector as claimed in claim 5 or 6, wherein the light source module further comprises a substrate, and the light emitting element is disposed on the substrate.

8. The single-chip LCD projector as claimed in claim 4, wherein the focal length d of the collimating lens, the distance c from the LCD screen to the collimating lens, and the back working distance i of the imaging lens satisfy the following formula: c is more than or equal to i-d.

9. The single-chip LCD projector of claim 4, further comprising a mirror positioned between the collimating lens and the imaging lens.

10. The single-chip LCD projector as claimed in claim 4, wherein the collimating lens is a Fresnel lens.