CN212989862U

CN212989862U - High-efficient lighting system of LCD projector

Info

Publication number: CN212989862U
Application number: CN202022523496.4U
Authority: CN
Inventors: 郭瀚文
Original assignee: Nanhua Intelligent Precision Machine Shenzhen Co Ltd
Current assignee: Nanhua Intelligent Precision Machine Shenzhen Co Ltd
Priority date: 2020-11-04
Filing date: 2020-11-04
Publication date: 2021-04-16
Anticipated expiration: 2030-11-04

Abstract

The utility model discloses a high-efficiency lighting system of an LCD projector, which comprises an LED light source, a condensing device, a collimating lens, a quarter wave plate, a brightening type polaroid, an LCD light valve, a field lens and a projection lens which are arranged in sequence according to the advancing direction of light; the LED light source comprises a heat-conducting substrate, wherein a light-emitting area is arranged on the heat-conducting substrate, a plurality of light-emitting wafers are arranged in the light-emitting area, a gap is formed between every two adjacent light-emitting wafers, and a reflecting film used for reflecting light is arranged in the light-emitting area corresponding to the area outside the light-emitting wafers. The utility model discloses really realized that projector lighting efficiency is showing and is promoting by a wide margin, compare the same luminance of prior art output, the utility model discloses can practice thrift the power consumption by a wide margin, to the square face that reduces preparation such as projector volume, noise, heat dissipation, cost and user experience, all have positive help.

Description

High-efficient lighting system of LCD projector

Technical Field

The utility model relates to a projector field especially relates to a high-efficient lighting system of LCD projector.

Background

Conventionally, a transmission-type single LCD projector is built on the condition that linearly polarized light irradiates liquid crystal molecules of the projector, a bright and dark image is generated by polarization detection, and illumination light from a light source can be almost considered as natural light, so that in the process from the natural light to the linearly polarized light, about more than or equal to 50% of the light is filtered by a polarizer of an LCD light valve, and the total polarization efficiency of the polarizer is usually less than or equal to 38% -45% in consideration of the requirement of the LCD light valve on the extinction ratio of the polarizer. Only with the illumination loss, the single LCD projector always has 55% -62% of energy to do useless work, which fundamentally influences the efficiency of the optical system of the single LCD projector and fundamentally increases the heat dissipation burden of the optical system of the projector, thereby fundamentally limiting the performance and application of the single LCD projector.

And explore the utility model discloses easily preparation, good and cheap efficiency promotion solution make single LCD projector have higher performance and wider application space, this is exactly the utility model discloses the problem that solves.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem, an object of the present invention is to provide a high-efficiency illumination system for LCD projector, which is very easy to manufacture and cheap and good.

The utility model provides a technical scheme as follows:

a high-efficiency lighting system of an LCD projector comprises an LED light source, a condensing device, a collimating lens, a quarter-wave plate, a brightness-enhanced polarizer, an LCD light valve, a field lens and a projection lens which are sequentially arranged according to the advancing direction of light. The LED light source comprises a heat-conducting substrate, wherein a light-emitting area is arranged on the heat-conducting substrate, a plurality of light-emitting wafers are arranged in the light-emitting area, and a gap is formed between every two adjacent light-emitting wafers; and a reflecting film for reflecting light is arranged in the light emitting area corresponding to the area outside the light emitting wafer.

Further, the brightness enhancement type polarizer adopts a linear polarizer, the transmission axis of the brightness enhancement type polarizer is consistent with the polarization plane of the incident polarized light required by the LCD light valve, and the brightness enhancement type polarizer transmits the linearly polarized light required by the LCD light valve; the reflection axis and the transmission axis of the brightening polarizer are orthogonal, and the brightening polarizer reflects linearly polarized light orthogonal to the polarization plane of the transmission axis of the brightening polarizer.

Further, the fast axis of the quarter-wave plate and the transmission axis of the brightness enhancement polarizer form any one of +45 °, -45 °, +135 °, and-135 °.

Optionally, the quarter-wave plate is formed by combining two eighth-wave plates, and an equivalent fast axis of the two eighth-wave plates and a transmission axis of the brightness enhancement polarizer form any one of +45 °, -45 °, +135 °, and-135 °.

Further, the light condensing device may be any one of a square cone condenser, a CPC (compound parabolic surface) condenser, and a condensing lens.

The utility model also provides a projection method of LCD projector high-efficient lighting system, including following step:

the light emitted by the LED light source sequentially passes through the light gathering device and the collimating lens to be collimated and then passes through the quarter-wave plate to reach the brightening type polaroid, the brightening type polaroid carries out polarized light separation on the light, one path of polarized light which is useful for the LCD light valve is transmitted, one path of polarized light which is useless for the LCD light valve is reflected, the two paths of polarized light are linearly polarized light, the amplitude is equal, and the vibration surfaces are orthogonal; one path of polarized light which is useful for the LCD light valve passes through the LCD light valve and then is projected out through a field lens and a projection lens in sequence; one path of polarization light which is useless for the LCD light valve is reflected back by the brightening type polaroid, the reflected light passes through the quarter-wave plate, is focused by the collimating lens and the condensing device, and then is irradiated on a light emitting area of the LED light source in a focusing mode, wherein one part of light is reflected by the reflecting film, is collected by the condensing device and collimated by the collimating lens in sequence, then passes through the quarter-wave plate to reach the brightening type polaroid, and the polarization plane of the reflected light passes through the quarter-wave plate twice and rotates by 90 degrees to be consistent with the transmission axis of the brightening type polaroid, so that one path of polarization light which is useless for the LCD light valve is partially usable, and the process of polarization light conversion is completed.

The utility model has the advantages that:

the utility model discloses leave suitable clearance when arranging the luminous wafer that the LED light source includes, and make the reflectance coating on the heat conduction base plate that the LED light source includes, blast type polaroid carries out the polarized light separation to the natural light, when separating out useful and useless two way linear polarized light to the LCD light valve, useless linear polarized light of the same kind will be reflected back and partly shine on the reflectance coating, reflect back to get into light condensing equipment once more by the reflectance coating, the light exhibition (optical expansion volume) can not produce obvious the overflow simultaneously, this way linear polarized light of useless, the plane of polarization is rotatory 90 after passing quarter wave plate twice in succession, make this way polarization of useless to the LCD light valve partly become usable, so really realized that projector lighting efficiency shows to promote with showing by a wide margin, compare prior art output same luminance, the utility model discloses can practice thrift the power consumption by a wide margin, to reducing projector volume, The manufacturing such as noise, heat dissipation, cost and the like and the aspects of user experience are all positively helped.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

fig. 2 is a schematic diagram of the arrangement of the LED light source light emitting chips of the present invention;

FIG. 3 is a schematic view of the polarized light conversion process of the present invention;

FIG. 4 is a partial schematic view of a light ray trace according to an embodiment of the present invention;

FIG. 5 is a graph showing an illumination profile on an LCD light valve according to an embodiment of the present invention;

fig. 6 shows illumination data on an LCD light valve according to an embodiment of the present invention.

Detailed Description

In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when in use, and are used for convenience of description and simplification of description, but do not refer to or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The specific embodiment is as follows:

as shown in fig. 1 to 6, the high-efficiency illumination system for an LCD projector provided in this embodiment includes an LED light source 1, a condensing device 2, a collimating lens 3, a quarter-wave plate 4, a brightness enhancement polarizer 5, an LCD light valve 6, a field lens 7, and a projection lens 8, which are sequentially arranged in the light traveling direction.

In this embodiment, the light condensing device 2 is a hollow square cone light condenser.

The brightness-enhanced polarizer 5 can be equivalent to a flat spectroscope, and realizes light splitting of natural light (equivalent to two linearly polarized lights with equal amplitude and orthogonal vibration planes), namely, the transmission and reflection of the two polarized lights are realized, and the light splitting effect is generated.

Referring to fig. 1-2 and fig. 4, when the professional software simulation is performed in the present embodiment, the size of the light emitting area of the LED light source 1 is set to 18.36 × 10.56mm, 45 light emitting wafers 102 of 40mil are uniformly distributed, and the total luminous flux is 9018Lm (lumens); the light condensing device 2 adopts a hollow square cone light condenser, the size of an incident port is 18.36x10.56mm, the size of an emergent port is 107.6x63.6mm, the length along an optical axis is 140mm, and the reflectivity of the inner wall is 100%; the collimating lens 3 is a plano-convex lens with a central thickness of 32, the material is QK2 (China), the spherical radius of the convex surface is 82.65, and the convex surface faces the LCD light valve 6; the quarter-wave plate 4 and the brightening type polaroid 5 are integrated on a piece of glass with the thickness of 0.5, the glass material K9L (China) is adopted, the incident surface of the glass is the quarter-wave plate 4, the emergent surface of the glass is the brightening type polaroid 5, the position of the incident surface of the glass is 0.1mm away from the peak of the emergent surface of the collimating lens 3, and the included angle between the fast axis of the quarter-wave plate 4 and the transmission axis of the brightening type polaroid 5 is 45 degrees; the LCD light valve 6 is a 4.5 inch light valve with a window size 101 x 56.8mm, 11mm from the exit face apex of the collimating lens 3, and a "surface receptor" is placed on the entrance face of the LCD light valve 6, and an "angular luminance meter" is placed on the "surface receptor". The success of this embodiment is shown in table 1 below:

table 1 effect demonstration of the present embodiment

The first row in table 1 shows the prior art projector output luminous flux of 325 Lm.

The second row in table 1 shows the technique of the present embodiment, and the projector output light flux amount is 625 Lm.

Therefore, the embodiment really realizes that the illumination efficiency of the projector is remarkably improved (by 1.92 times), and the projector outputs the same brightness compared with the prior art, can greatly save the power consumption, and is positively helpful for reducing the manufacturing and user experience aspects such as the volume, the noise, the heat dissipation, the cost and the like of the projector.

Fig. 3 shows the process of converting polarized light in this embodiment, after passing through the light condensing device 2, any light W emitted from the light emitting wafer 102 disposed in the light emitting region of the LED light source 1 passes through the quarter-wave plate 4 to reach the brightness enhancement polarizer 5 for polarized light separation. One path of polarized light P useful for the LCD light valve 6 is transmitted, and one path of polarized light S not useful for the LCD light valve 6 is reflected back and passes through the quarter-wave plate 4, and passes through the quarter-wave plate 4 again after being reflected by the reflective film 101. At this time, after the polarized light S passes through the quarter-wave plate 4 twice in succession, the polarization plane is rotated by 90 ° to P1, thereby passing through the brightness enhancement polarizer 5 for the LCD light valve 6.

Since any position of the light-emitting region on the LED light source 1 satisfies the etendue of the system, even if the light is reflected by the reflective film 101 and enters the light-gathering device 2 again and reaches the LCD light valve 6, the etendue does not overflow significantly, so that it can be utilized by the system.

In FIG. 3, the gap between the light emitting chips 102 is L, and the thickness of the light emitting chips is H, in this embodiment, when L/H is greater than or equal to 1.666 times, a higher efficiency improvement can be obtained, and the L/H is about 4.24 in the arrangement of the light emitting chips of this embodiment. The choice of the gap size L, in addition to being in a certain relationship with H, should be combined with the desired luminous flux output by the LED light source 1, the required luminous flux of the projector, and the limitations of the projector lens 8 and the LCD light valve 6 on the etendue of the light emitting area of the light source, and the length and width dimensions, efficiency, etc. of the light emitting chip 102, in order to be economical, efficient, and reasonable. For example, in a defined light emitting region, the number of the light emitting chips 102 is much arranged, the total luminous flux of the LED light source 1 is large, but the polarized light conversion efficiency is low, the output brightness of the projector is high, and the energy consumption is high; when the number of the light emitting chips 102 is properly arranged, the total luminous flux of the LED light source 1 may be much smaller, but the polarization conversion efficiency is high, the output brightness of the projector is high, and the energy consumption and the cost are much lower.

Fig. 4 is a partial schematic view of the ray trace of the present embodiment, in which the light-gathering device 2 and other raw materials are hidden for easy observation, and only the LED light source 1 and about 80 visible rays of trace are retained.

FIG. 5 shows the distribution of the illuminance of the surface receptor on the incident surface of the LCD light valve 6 of this embodiment (about 4.4-4.5 inches), with very good uniformity and aperture angle for the setup.

FIG. 6 is several exemplary illumination data for a surface receiver on the incident surface of the LCD light valve 6 that can be used to quantify the uniformity of the projected image for the illumination profile of FIG. 5. In general, the serious optical design and fabrication, the goodness of fit of actual results and design is extremely high.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The principles and embodiments of the present invention have been explained herein using specific examples, which are presented only to assist in understanding the methods and their core concepts. It should be noted that there are infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that various improvements, decorations or changes can be made without departing from the principles of the present invention, and the technical features can be combined in a suitable manner; the application of these modifications, variations or combinations, or the application of the concepts and solutions of the present invention in other contexts without modification, is not intended to be considered as a limitation of the present invention.

Claims

1. An efficient illumination system of an LCD projector comprises an LED light source (1), a condensing device (2), a collimating lens (3), a quarter-wave plate (4), a brightness enhancement type polarizer (5), an LCD light valve (6), a field lens (7) and a projection lens (8) which are sequentially arranged according to the advancing direction of light; the LED light source (1) is characterized by comprising a heat-conducting substrate (103), wherein a light-emitting region is arranged on the heat-conducting substrate (103), a plurality of light-emitting wafers (102) are arranged in the light-emitting region, and a gap is formed between every two adjacent light-emitting wafers (102); a reflection film (101) for reflecting light is provided in the light emitting region in a region other than the light emitting wafer (102).

2. The efficient lighting system for LCD projector as claimed in claim 1, wherein said brightness enhancement polarizer (5) is a linear polarizer, the transmission axis of said brightness enhancement polarizer (5) is in accordance with the polarization plane of the incident polarized light required by said LCD light valve (6), said brightness enhancement polarizer (5) transmits the linearly polarized light required by said LCD light valve (6); the reflection axis and the transmission axis of the brightness enhancement type polarizer (5) are orthogonal, and the brightness enhancement type polarizer (5) reflects linearly polarized light with the polarization plane orthogonal to the transmission axis of the brightness enhancement type polarizer.

3. An efficient illumination system for LCD projector as claimed in claim 1, characterized in that the fast axis of the quarter-wave plate (4) and the transmission axis of the brightness enhancing polarizer (5) are at any one of +45 °, -45 °, +135 ° and-135 °.

4. The high-efficiency illumination system of the LCD projector as claimed in claim 1, wherein the quarter-wave plate (4) is formed by combining two eighth-wave plates, and the combined equivalent fast axis of the two eighth-wave plates and the transmission axis of the brightness enhancement polarizer (5) form any one of +45 °, -45 °, +135 ° and-135 °.

5. An efficient illumination system for LCD projector as claimed in claim 1, characterized in that said condenser means (2) is any one of a square-cone condenser, a CPC condenser and a condenser lens.