CN222232859U - LCD straight light projecting path structure - Google Patents
LCD straight light projecting path structure Download PDFInfo
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- CN222232859U CN222232859U CN202420883358.2U CN202420883358U CN222232859U CN 222232859 U CN222232859 U CN 222232859U CN 202420883358 U CN202420883358 U CN 202420883358U CN 222232859 U CN222232859 U CN 222232859U
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Abstract
The utility model relates to a LCD straight light projecting path structure, which comprises a light emitting unit, a rear Fresnel lens, an LCD screen, a front Fresnel lens and a projection lens which are sequentially arranged along the light propagation direction; the focal length of the rear Fresnel lens is 40-80 mm, the size of the LCD screen is 2.2-3.2 inches, and the focal length of the front Fresnel lens is 50-90 mm; the play plain noodles of LCD screen extremely the distance between the income plain noodles of projecting lens is 40 70mm, projecting lens's focus < 80mm, this application LCD straight light projecting path structure adopts reasonable light path design, the reflector has been cancelled, the mode of adopting the direct projection has improved the utilization ratio to the light, and through 2.2 3.2 the mode of LCD screen formation projection image of inch, collocation suitable focus's back fresnel lens and preceding fresnel lens simultaneously utilizes the projecting lens of short focus, can shorten the light path from this, when accomplishing the projection ratio and be less than 1.2, realized LCD projector's miniaturization, and so set up can make full use of marginal light, the utilization ratio and the illuminance homogeneity of light have been improved.
Description
Technical Field
The utility model relates to the technical field of LCD projectors, in particular to an LCD straight light projection path structure.
Background
The single-chip LCD projector images by emitting light to the LCD panel using a light emitting source and then projecting the light transmitted through the LCD panel onto a curtain through a projection lens.
Along with the increasing application of projectors in daily life, the illumination of the single-chip LCD projector is improved to be a development trend, but the single-chip LCD projector has a plurality of problems of low light utilization rate, larger projection ratio, small projection picture and the like due to unreasonable design and arrangement of various optical elements and the arrangement of the single-chip LCD projector.
Disclosure of utility model
Based on the above, the utility model aims to overcome the defects of the prior art and provide an LCD straight light projecting path structure.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
The LCD straight projection path structure comprises a light emitting unit, a rear Fresnel lens, an LCD screen, a front Fresnel lens and a projection lens which are sequentially arranged along the light propagation direction;
The rear Fresnel lens has a focal length of 40-80mm, the LCD screen has a size of 2.2-3.2 inches, the front Fresnel lens has a focal length of 50-90mm, the distance between the light emergent surface of the LCD screen and the light incident surface of the projection lens is 40-70mm, and the focal length of the projection lens is less than 80mm.
As one embodiment, a heat insulating sheet is disposed between the rear fresnel lens and the LCD panel.
As one embodiment, the length of the heat insulation sheet is 50-70mm, the width is 25-45mm, and the thickness is 0.9-1.2mm.
As one embodiment, the surface of the heat insulating sheet is provided with a brightness enhancement film.
As one embodiment, the surface of the heat insulating sheet is further provided with a polarizing film.
As an implementation manner, the light emitting unit includes a light emitting source and a light funnel, the light emitting source is disposed at a light inlet of the light funnel, the rear fresnel lens is disposed at a light outlet of the light funnel, and a size of the light inlet is smaller than a size of the light outlet.
As one implementation mode, the length of the light inlet is 8-12mm, the width of the light inlet is 5-8mm, the length of the light outlet is 41-60mm, the width of the light outlet is 24-41mm, and the distance between the light inlet and the light outlet is 35-55mm.
As one embodiment, the light emitting source is an LED, and the light emitting power thereof is 25-35W.
As one embodiment, the light emitting surface of the LED has a length of 8-10mm, a width of 5-7mm, and a light emitting angle of 120 °.
As an embodiment, the inner surface of the light funnel is provided with a reflective layer.
The LCD straight projection path structure adopts reasonable light path design, the reflector is omitted, the utilization rate of light is improved by adopting a straight projection mode, a projection image is formed through a 2.2-3.2 inch LCD screen, meanwhile, a rear Fresnel lens and a front Fresnel lens with proper focal lengths are matched, and a projection lens with a short focal length is utilized, so that the light path can be shortened, the miniaturization of an LCD projector is realized while the projection ratio is smaller than 1.2, and the arrangement can fully utilize marginal light and improve the utilization rate and illumination uniformity of the light.
For a better understanding and implementation, the present utility model is described in detail below with reference to the drawings.
Drawings
FIG. 1 is a schematic diagram of a structure of a light-emitting diode of an LCD according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a light funnel according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a light funnel according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an LCD screen according to an embodiment of the present application;
fig. 5 is a schematic structural view of a heat insulating sheet according to an embodiment of the present application.
Detailed Description
For further illustration of the various embodiments, the utility model is provided with the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments and together with the description, serve to explain the principles of the embodiments. With reference to these matters, one of ordinary skill in the art will understand other possible implementations and advantages of the present utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present utility model.
Referring to fig. 1 to 5, the present embodiment provides an LCD straight light projecting path structure, which can be applied to an LCD projector, and specifically, the LCD straight light projecting path structure of the present embodiment includes a light emitting unit 1, a rear fresnel lens 2, an LCD screen 4, a front fresnel lens 5, and a projection lens 6 sequentially arranged along a light propagation direction.
The light emitting unit 1 can emit white light, the focal length of the rear Fresnel lens 2 is 40-80mm, the size of the LCD screen 4 is 2.2-3.2 inches, the focal length of the front Fresnel lens 5 is 50-90mm, the distance from the light emitting surface of the LCD screen 4 to the light incident surface of the projection lens 6 is 40-70mm, and the focal length of the projection lens 6 is <80mm.
According to the technical scheme, the LCD direct projection path structure of the embodiment adopts reasonable light path design, the reflector is omitted, the utilization rate of light is improved in a direct projection mode, a projection image is formed through the 2.2-3.2 inch LCD screen 4, meanwhile, the rear Fresnel lens 2 and the front Fresnel lens 5 with proper focal lengths are matched, and the short-focal-length projection lens 6 is utilized, so that the light path can be shortened, the projection ratio is smaller than 1.2, the miniaturization of an LCD projector is realized, the marginal light can be fully utilized, and the utilization rate and the illumination uniformity of the light are improved.
Preferably, the light emitting unit 1 includes a light emitting source 11 and a light funnel 12, where the light emitting source 11 may emit light, as shown in fig. 2 and 3, the light funnel 12 has a light inlet 121 and a light outlet 122 opposite to each other along an optical axis, the size of the light inlet 121 is smaller than that of the light outlet 122, the light inlet 121 of the light funnel 12 is rectangular, and has a pair of short sides and a pair of long sides, and similarly, the light outlet 122 of the light funnel 12 is rectangular, and also has a pair of short sides and a pair of long sides, the short sides of the light inlet 121 correspond to the short sides of the light outlet 122, and the long sides of the light inlet 121 correspond to the long sides of the light outlet 122, so that a light condensing cavity inside the light funnel 12 is in a trapezoid structure, and a reflecting layer coated with silver or a reflecting film is disposed on the surface of the light condensing cavity inside the light funnel 12, so that the incident light is emitted substantially uniformly and parallel.
The light source 11 is disposed at the light inlet 121 of the light funnel 12, the rear fresnel lens 2 is disposed at the light outlet 122 of the light funnel 12, as shown in fig. 2, the length L1 of the light inlet 121 is 8-12mm, the width W1 is 5-8mm, the length L2 of the light outlet 122 is 41-60mm, the width W2 is 24-41mm, the distance D3 between the light inlet 121 and the light outlet 122 is 35-55mm, and the light funnel 12 is reasonable in size design, so that light rays exiting from the light funnel 12 are uniform.
As shown in fig. 4, the light-emitting source 11 is preferably an LED, where in this embodiment, the LED is a COB packaged LED, the light-emitting power of the COB packaged LED is 25-35W, the length L3 of the light-emitting surface of the LED is 8-10mm, the width W3 is 5-7mm, the light-emitting angle is 120 °, the emitted light is white light, the light-emitting brightness is sufficient, and the angle is reasonable.
The rear fresnel lens 2 may be, but is not limited to, made of a low-cost plastic material, and has a plurality of concentric corrugated structures on its surface to form a collimating lens structure. The front fresnel lens 5 may be, but is not limited to, a lower cost plastic material with a concentric plurality of corrugations on the surface to form a focusing mirror structure.
In order to reduce the light emission heat and reduce the risk of device damage, it is preferable that a heat insulating sheet 3 is provided between the rear fresnel lens 2 and the LCD panel 4. As shown in FIG. 5, the heat insulating sheet 3 is made of glass, the length L4 of the heat insulating sheet 3 is 50-70mm, the width W4 is 25-45mm, and the thickness is 0.9-1.2mm. Preferably, a brightness enhancement film is disposed on the surface of the heat insulating sheet 3 to enhance brightness of light, and the surface of the brightness enhancement film is a 90 ° incremental prism structure, and further, a polarizing film is disposed on the surface of the heat insulating sheet 3 to filter polarized light, so as to play a role in blocking stray light.
In the LCD straight light projecting path structure of this embodiment, light is emitted from the LED and is incident to the light funnel 12 for multiple reflections, so as to achieve a light homogenizing effect, the light is collimated by the rear fresnel lens, the collimated nearly parallel light illuminates the LCD screen 4, then the light is condensed by the front fresnel lens to further reduce the light beam, and finally the light is projected on the screen by the projection lens 7 to form an image.
The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the inventive manual self-centering vise. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model.
Claims (10)
1. An LCD straight light projecting path structure, comprising:
the light emitting unit, the rear Fresnel lens, the LCD screen, the front Fresnel lens and the projection lens are sequentially arranged along the light propagation direction;
The rear Fresnel lens has a focal length of 40-80mm, the LCD screen has a size of 2.2-3.2 inches, the front Fresnel lens has a focal length of 50-90mm, the distance between the light emergent surface of the LCD screen and the light incident surface of the projection lens is 40-70mm, and the focal length of the projection lens is less than 80mm.
2. The LCD straight light projecting path structure according to claim 1, wherein:
And a heat insulation sheet is arranged between the rear Fresnel lens and the LCD screen.
3. The LCD straight light projecting path structure according to claim 2, wherein:
The length of the heat insulation sheet is 50-70mm, the width is 25-45mm, and the thickness is 0.9-1.2mm.
4. The LCD straight light projecting path structure according to claim 2, wherein:
The surface of the heat insulating sheet is provided with a brightness enhancement film.
5. The LCD straight light projecting path structure according to claim 2, wherein:
The surface of the heat insulating sheet is also provided with a polarizing film.
6. The LCD straight light projecting path structure according to any one of claims 1 to 5, wherein:
The light emitting unit comprises a light emitting source and a light funnel, wherein the light emitting source is arranged at a light inlet of the light funnel, the rear Fresnel lens is arranged at a light outlet of the light funnel, and the size of the light inlet is smaller than that of the light outlet.
7. The LCD straight light projecting path structure according to claim 6, wherein:
The length of the light inlet is 8-12mm, the width of the light inlet is 5-8mm, the length of the light outlet is 41-60mm, the width of the light outlet is 24-41mm, and the distance between the light inlet and the light outlet is 35-55mm.
8. The LCD straight light projecting path structure according to claim 6, wherein:
The luminous source is an LED, and the luminous power is 25-35W.
9. The LCD straight light projecting path structure according to claim 8, wherein:
The length of the luminous surface of the LED is 8-10mm, the width of the luminous surface of the LED is 5-7mm, and the luminous angle of the LED is 120 degrees.
10. The LCD straight light projecting path structure according to claim 6, wherein:
the inner surface of the light funnel is provided with a reflecting layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420883358.2U CN222232859U (en) | 2024-04-25 | 2024-04-25 | LCD straight light projecting path structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420883358.2U CN222232859U (en) | 2024-04-25 | 2024-04-25 | LCD straight light projecting path structure |
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| Publication Number | Publication Date |
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| CN222232859U true CN222232859U (en) | 2024-12-24 |
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| CN202420883358.2U Active CN222232859U (en) | 2024-04-25 | 2024-04-25 | LCD straight light projecting path structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121384980A (en) * | 2025-12-23 | 2026-01-23 | 厦门思泰克智能科技股份有限公司 | Light detection system for object surface and control method thereof |
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2024
- 2024-04-25 CN CN202420883358.2U patent/CN222232859U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121384980A (en) * | 2025-12-23 | 2026-01-23 | 厦门思泰克智能科技股份有限公司 | Light detection system for object surface and control method thereof |
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