CN206095585U - Light detecting system and light detection device - Google Patents

Abstract

The utility model proposes a light detection system and a light detection device, wherein the light detection system includes a light source, a first diaphragm, a uniform light unit, a polarized light conversion unit, an LCD panel, and a detection unit arranged sequentially along the optical path, and the light source generates The light beam passes through the first aperture to block unnecessary light, and the useful light enters the polarization conversion unit after being homogenized by the uniform light unit, and outputs the required S-state or P-state polarized light, and further blocks the useless light through the second aperture. The stray light is transmitted through the LCD panel and enters the detection unit, which can accurately detect the amount of light transmitted by the LCD panel, and then can more accurately match the efficiency of the light machine according to the detection value of the transmitted light of the LCD panel. The optical detection system of the utility model solves the technical problems of inaccurate light brightness and inaccurate optical-mechanical efficiency detected by the existing optical detection system, reduces the optical inspection process, and greatly improves the detection efficiency.

Description

Optical detection system and optical detection device

technical field

The utility model relates to the field of optical technology, in particular to a light detection system and a light detection device.

Background technique

At present, projection technology is advancing by leaps and bounds. The light source has undergone technological innovation from traditional xenon lamp, UHP lamp, to laser light source, but the corresponding detection system has not been updated. The efficiency calibration of the light source still uses the earlier detection system, that is, the light source Through a circular small hole, by detecting the brightness of the light passing through the small hole, it is defaulted to the brightness of the light transmitted by the light valve of the LCD, and accordingly used as the light source and light valve used in the above detection system factory brightness of the projection device. The data detected by the existing optical detection system brings many uncertain factors to the design and analysis of the subsequent optical-mechanical efficiency, because the data provided by the manufacturer is not obtained according to the optimized design angle and size test, and has a large deviation , and thus the detected brightness of light transmitted by, for example, the LCD light valve is also inaccurate.

Utility model content

The main purpose of the utility model is to provide a light detection system, aiming to solve the technical problems of inaccurate light brightness and inaccurate light-mechanical efficiency detected by the existing light detection system.

In order to achieve the above object, the utility model proposes a light detection system, including a light source, a first aperture, a uniform light unit, a polarization conversion unit, an LCD panel, and a detection unit arranged sequentially along the optical path; wherein,

light source, producing a beam of light;

The first aperture is used to adjust the angle and intensity of the light beam;

a uniform light unit, which uniformly processes the light beam passing through the first diaphragm;

A polarization conversion unit, which outputs the light beam passing through the homogenization unit as S-state polarized light or P-state polarized light;

The LCD panel receives the S-state polarized light or the P-state polarized light output by the polarization conversion unit;

The detection unit detects the brightness of light transmitted from the LCD panel, and then calculates the optical-mechanical efficiency.

Further, the polarization conversion unit includes a barrier, a PBS, and a 1/2 wave plate arranged sequentially along the optical path; wherein,

A fence to filter part of the light beam output from the uniform light unit;

PBS, transmits P-state polarized light, reflects S-state polarized light;

The 1/2 wave plate converts the P-state polarized light transmitted from the PBS to the S-state polarized light.

Further, the light detection system also includes a first condenser lens, the first condenser lens is arranged on the optical path between the polarization conversion unit and the LCD panel, and collects the S-state polarized light output by the polarization conversion unit, into the LCD panel.

Further, the light detection system also includes a second aperture, the second aperture is arranged on the optical path between the first condenser lens and the LCD panel, and adjusts the S-state polarized light incident on the LCD panel. angle and strength.

Further, the photodetection system also includes a second condenser lens, the second condenser lens is arranged on the optical path between the first condenser lens and the second diaphragm, and focuses S-state polarized light, which enters the LCD panel described above.

Further, the uniform light unit includes a first fly-eye lens array facing the light source and a second fly-eye lens array facing away from the light source, and the light beam passing through the first fly-eye lens array is focused on the focal length of the second fly-eye lens array is f' _A , then Wherein, A is the diameter of the light beam, W is the width of the LCD panel, and f' _B is the focal length of the lens group composed of the second fly-eye lens array and the first condenser lens, or is the second fly-eye lens array, the first condenser lens and the focal length of the lens group composed of the second condenser lens.

further, Wherein, φ is the maximum deflection angle at which the light beam can enter the polarization conversion unit; the value of F/# is 1.6-2.4.

Further, the light source is laser, LED or light bulb.

Another object of the present utility model is to provide a light detection device, which includes the above light detection system.

The optical detection system of the present utility model comprises a light source, a first aperture, a uniform light unit, a polarized light conversion unit, an LCD panel, and a detection unit arranged in sequence along the optical path. Blocked, the useful light enters the polarization conversion unit after being homogenized by the uniform light unit, outputs the required S-state polarized light or P-state polarized light, and then transmits through the LCD panel and enters the detection unit, which can be calculated according to the amount of light transmitted to the LCD panel The actual brightness of the light source, and then more accurately match the efficiency of the light machine. The optical detection system of the utility model solves the technical problems of inaccurate brightness and inaccurate optical-mechanical efficiency of the light transmitted by the LCD detected by the existing optical detection system, reduces the optical inspection process, and greatly improves the detection efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the present utility model, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without creative work.

Fig. 1 is the structural representation of an embodiment of the light detection system of the present invention;

FIG. 2 is a schematic structural diagram of the polarization conversion unit of FIG. 1;

Fig. 3 is the optical path diagram of an embodiment of the optical detection system of the present invention;

Fig. 4 is another structural schematic diagram of the polarization conversion unit of the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of the light detection device of the present invention.

Explanation of reference numbers:

label name label name 10 light source 50 LCD panel 20 first stop 60 detection unit 30 Uniform light unit 70 first condenser lens 40 Polarization conversion unit 80 second aperture 41 the fence 90 second condenser lens 42 PBS 100 Light source detection device 43 1/2 wave plate

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

In addition, the descriptions related to "first", "second" and so on in the present application are only for the purpose of description, and should not be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , also not within the scope of protection required by the utility model.

Referring to Fig. 1, the utility model proposes an embodiment of a light detection system, including a light source 10, a first diaphragm 20, a uniform light unit 30, a polarization conversion unit 40, an LCD panel 50, and a detection unit 60 arranged in sequence along the optical path ;in,

A light source 10 for generating light beams;

The first diaphragm 20 is used to adjust the angle and intensity of the light beam;

A dodging unit 30 for dodging the light beam passing through the first aperture 20;

a polarization conversion unit 40, outputting the light beam passing through the uniform light unit 30 as S-state polarized light or P-state polarized light;

The LCD panel 50 receives the S-state polarized light or the P-state polarized light output by the polarization conversion unit 40;

The detection unit 60 detects the brightness of the light transmitted from the LCD panel 50, and then calculates the optical-mechanical efficiency.

The photodetection system of this embodiment includes a light source 10, a first diaphragm 20, a uniform light unit 30, a polarization conversion unit 40, an LCD panel 50, and a detection unit 60 arranged in sequence along the optical path, and the optical path simulates the optical path structure of an optical machine After the light beam generated by the light source 10 is incident on the first diaphragm 20 and before the homogenization unit 30, the light quantity is simulated as the light quantity of the light incident machine, and the light quantity transmitted out of the LCD panel 50 is simulated as the light quantity of the light exit machine. The light source 10 is used to generate light beams. In this embodiment, the light source 10 is provided by the laser in the projector, and the laser is used to excite the fluorescent wheel to generate red, green and blue fluorescence. In other embodiments, the light source can also be selected Provided by LED or bulb in the projector, also, the projector type can be 3LCD or single LCD. The first aperture 20 is used to adjust the angle and intensity of the light beam. Since the brightness and angle of the light beam detected each time are different, in order to test the brightness of the light incident to the LCD panel and transmitted as accurately as possible, the first light The diaphragm 20 controls the size of the light beam through a special clear aperture according to the size of the entire surface of the dodging unit 30, filters out unnecessary stray light, and injects useful light into the dodging unit 30 for dodging treatment. The light unit 30 is generally a double-row fly-eye lens array, and a homogenizing rod can also be used to refract the angle-dispersed light beam twice through the double-row fly-eye lens array to form a uniform parallel light beam and inject it into the polarization conversion unit 40. The polarization conversion unit 40 It is mainly used to transmit the S-state polarized light carried by the light beam itself, and convert the P-state polarized light after homogenization treatment by the homogenization unit 30 into S-state polarized light, so as to be more conducive to the utilization of the LCD panel 50, or to project the P-state polarization of the light beam light, and convert the S-state polarized light homogenized by the light-homogenizing unit 30 into P-state polarized light.

In the embodiment provided in Fig. 1, the LCD panel 50 is the receiving carrier of the S-state polarized light or the P-state polarized light, and is also an important part of testing the imaging range and brightness of the LCD panel 50, and the brightness of the light passing through the LCD panel 50 When testing, the brightness transmitted by LCD panels of different models can be simulated by adjusting the size of the LCD panel 50. Different LCD panels require different uniform light units 30 to correspond to them, and when the light detection system works, the LCD The panel is in a non-working state, that is, the direction and polarization state of the light source under measurement are not changed, so that the S-state polarized light or P-state polarized light incident on the LCD panel 50 directly enters the detection unit 60, so that the detection unit 60 directly detects the polarized light from the LCD panel 50. The brightness of the light transmitted by the plate 50 ensures that the measured value obtained is accurate. In the embodiment provided in FIG. 1 , the detection unit 60 is an integrating sphere, and a brightness detector can also be used in other embodiments. In addition, since the light machine efficiency = the light quantity of the light machine/the light volume of the light machine, the light volume of the light machine directly affects the accuracy of the light machine efficiency. In the prior art, the measured value of the amount of light transmitted by the LCD panel is smaller than the actual value, resulting in a lower light-mechanical efficiency value than the actual value. The light detection system of the utility model detects the light incident on the LCD panel and transmitted The brightness is more accurate, so the optical-mechanical efficiency obtained is also more objective and accurate. In addition, as a way of detecting the light quantity of the light entering machine, referring to FIG. 1 , the detection unit 60 can be arranged directly behind the first aperture 20, so that the detection unit 60 can detect the light source 10 by adjusting the first aperture 20 The amount of light emitted, thereby obtaining the light amount detection value of the light entering machine, and then obtaining accurate light machine efficiency. It should be noted that the light amount of the light entering machine can also be obtained in other ways, because the light detection system of the utility model can It is guaranteed to obtain accurate luminance detection value of light transmitted by the LCD panel, therefore, accurate optical-mechanical efficiency can be guaranteed to be obtained.

The photodetection system of this embodiment includes a light source 10, a first aperture 20, a uniform light unit 30, a polarization conversion unit 40, an LCD panel 50, and a detection unit 60 arranged in sequence along the optical path. The light source 10 generates a light beam, which passes through the first The diaphragm 20 blocks unnecessary light, and the useful light enters the polarization conversion unit 40 after being homogenized by the light homogenization unit 30, outputs the required S-state polarized light or P-state polarized light, transmits through the LCD panel 50, and enters the detection unit 60, can accurately detect the amount of light transmitted by the LCD, and then match the efficiency of the light machine more accurately. The optical detection system of the utility model solves the technical problems of inaccurate brightness and inaccurate optical-mechanical efficiency of the light transmitted by the LCD detected by the existing optical detection system, reduces the optical inspection process, and greatly improves the detection efficiency.

Further, referring to FIG. 2 and FIG. 3, the polarization conversion unit 40 includes a barrier 41, a PBS42, and a 1/2 wave plate 43 arranged in sequence along the optical path; wherein,

The fence 41 filters part of the light beam output from the uniform light unit 30;

PBS42, transmits P-state polarized light, reflects S-state polarized light;

The 1/2 wave plate 43 converts the P-state polarized light transmitted from the PBS42 into the S-state polarized light.

In the photodetection system of this embodiment, the polarization conversion unit 40 includes a fence 41, a PBS42, and a 1/2 wave plate 43 arranged in sequence along the optical path; The light beam, the laser-excited fluorescent wheel emits polarized light including P state and S state, which is incident within the angle range of φ, and when φ reaches a certain angle, it will be projected on the barrier 41 during output, thereby preventing it from projecting on PBS42, while in φ The part of the fluorescent light incident within the angle range is incident to the PBS42 through the gap of the fence 41. The PBS42 is a polarization beam splitting prism that can transmit the P-state polarized light and reflect the S-state polarized light. Therefore, the P-state polarized light transmitted from the PBS42 directly It is incident to the 1/2 wave plate 43 in the same optical path as PBS42, and the S-state polarized light reflected by PBS42 is reflected by the PBS array and exits from the gap of 1/2 wave plate 43, and enters LCD50, 1/2 wave plate 43 , also known as a half-wave plate, is a birefringent crystal with a certain thickness, generally made of mica sheet, mainly used to change the P-state polarized light transmitted from PBS42 to circular polarized light, and convert it to LCD panel 50, which is easier to receive S-state polarized light is used.

Referring to Fig. 4, in this embodiment, the polarization conversion unit 40 includes a barrier 41, a PBS 42, and a 1/2 wave plate 43 arranged in sequence along the optical path, and the laser excites the fluorescent wheel to emit polarized light including a P state and an S state at an angle of φ It is incident within the range and enters PBS42 through the gap of the fence 41. PBS42 transmits P-state polarized light and reflects S-state polarized light. The reflected S-state polarized light is reflected by PBS42 again and then enters 1/2 wave plate 43. The refraction of the 2-wave plate 43 converts the P-state polarized light into the LCD panel 50 together with the P-state polarized light transmitted through the PBS 42 and transmitted through the gap between the 1/2-wave plates 43 .

Further, referring to FIG. 1 , the photodetection system also includes a first condenser lens 70, which is arranged on the optical path between the polarization conversion unit 40 and the LCD panel 50, and collects the polarized light conversion unit 40. The output S-state polarized light enters the LCD panel 50 .

In the photodetection system of this embodiment, a first condenser lens 70 is also arranged on the optical path between the polarization conversion unit 40 and the LCD panel 50. The first condenser lens 70 is mainly used for converting the S output from the polarization conversion unit 40 State polarized light is collected and aggregated, so that the S-state polarized light output from the polarization conversion unit 40 is incident on the LCD panel 50 as much as possible, thereby ensuring a relatively accurate amount of outgoing light, and further improving the data accuracy of the light detection system .

Further, referring to FIG. 1 , the photodetection system also includes a second aperture 80, which is arranged on the optical path between the first condenser lens 70 and the LCD panel 50, and adjusts the light incident on the The angle and strength of the S-state polarized light of the LCD panel 50 .

In the light detection system of this embodiment, a second aperture 80 is also arranged on the optical path between the first condenser lens 70 and the LCD panel 50, and the second aperture 80 can automatically adjust its position according to the size of the LCD panel. light transmission aperture, and then adjust the angle and strength of the S-state polarized light incident to the LCD panel 50, the light detection system of this embodiment can simulate different types of optical machines according to different LCD panels 50, and then detect different The amount of emitted light, and the second aperture 80 can automatically adjust the amount of light incident to the LCD panel 50 according to the size of the LCD panel 50, so as to more accurately match the efficiency of the light machine.

Further, referring to FIG. 1 and FIG. 3 , the photodetection system further includes a second condenser lens 90 , and the second condenser lens 90 is arranged between the first condenser lens 70 and the second diaphragm 80 The optical path focuses S-state polarized light and enters the LCD panel 50 .

In the photodetection system of this embodiment, according to the size of the focal length f' _B of the lens group composed of the second fly-eye lens array and the first condenser lens 70, the distance between the first condenser lens 70 and the second diaphragm 80 can be The second condensing lens 90 is set on the optical path to further focus the polarized light in the S state, and collect the large light spot emitted from the homogenization unit 30 and the polarization conversion unit 40 into a required small light spot, and then pass through the automatically adjustable second diaphragm 80 is incident on the LCD panel 50, reducing the light loss of the light beam and improving the data accuracy of the light detection system.

Further, referring to FIG. 1 and FIG. 3 , the uniform light unit 30 includes a first fly-eye lens array facing the light source 10 and a second fly-eye lens array facing away from the light source 10, and the light beam passing through the first fly-eye lens array The focal length focused on the second fly-eye lens array is f' _A , then Wherein, A is the diameter of the light beam, W is the width of the LCD panel, and f′ _B is the focal length of the lens group composed of the second fly-eye lens array and the first condenser lens 70 .

In the photodetection system of this embodiment, the homogenization unit 30 includes a first fly-eye lens array facing the light source 10 and a second fly-eye lens array facing away from the light source 10, and the light source 10 passes through the first diaphragm that can automatically adjust the light transmission aperture. 20. Intercept the large-angle light generated by the light source 10, and the remaining light beams are incident on the first fly-eye lens array, refracted by the first fly-eye lens array, and then incident on the second fly-eye lens array. The focal length of the beam focused on the second fly-eye lens array is f' _A , then Wherein, A is the diameter of the light beam, W is the width or length of the LCD panel, and f' _B is the focal length of the lens group composed of the second fly-eye lens array and the first condenser lens 70. From the above formula, it can be seen that if the diameter of the light beam is too large , a part of the light beam will not be incident on the first fly-eye lens array.

Further, referring to Fig. 3, Wherein, φ is the maximum deflection angle at which the light beam can enter the polarization conversion unit 40; the value of F/# is 1.6-2.4.

In the light detection system of this embodiment, the F number is determined by the focal length f' _B of the lens group consisting of the second fly-eye lens array and the first condenser lens 70, and the maximum deflection angle φ at which the light beam can enter the polarization conversion unit, namely because but F/# is a professional term in this field, that is, F number, aperture number or the reciprocal of relative aperture, f is the focal length of the first condensing lens 70, d is the diameter of the first condensing lens 70, and in the art, there is a certain selection correspondence between W and F/#, that is, according to the size of the LCD panel 50, The value range of F/# can be determined. Generally, the value of F/# is 1.6-2.4. Therefore, when the optimal F number is selected, the maximum deflection of the beam that can enter the polarization conversion unit can be determined. The angle φ can also determine that if the angle of the light emitted from the second fly-eye lens array is greater than the value of φ, it will be blocked by the barrier 41 in the polarization conversion unit 40 .

Referring to FIG. 5 , FIG. 5 is a schematic structural diagram of an embodiment of a light source detection device of the present invention. In this embodiment, the light source detection device 100 includes the light detection system as described above.

The light detection system of the light source detection device 100 of this embodiment includes a light source 10, a first aperture 20, a uniform light unit 30, a polarization conversion unit 40, an LCD panel 50, a detection unit 60, and a first light focusing unit arranged in sequence along the optical path. Lens 70 , second aperture 80 , and second condenser lens 90 , the light source 10 generates light beams, and the unnecessary light is blocked by the first aperture 20 , and the useful light enters the polarization conversion after being uniformed by the uniform light unit 30 The unit 40 outputs the required S-state polarized light or P-state polarized light, and further blocks useless stray light through the second diaphragm 80, and then transmits through the LCD panel 50 and enters the detection unit 60, which can accurately detect the light transmitted by the LCD panel The amount of light, and then can more accurately match the efficiency of the light machine according to the detection value of the transmitted light of the LCD panel. The optical detection system of the utility model solves the technical problems of inaccurate luminance and inaccurate optical-mechanical efficiency of the light transmitted by the LCD detected by the existing optical detection system, reduces the optical inspection process, and greatly improves the detection efficiency.

The above is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. Under the utility model concept of the utility model, the equivalent structural transformation made by using the specification of the utility model and the contents of the accompanying drawings, Or directly/indirectly used in other related technical fields are all included in the patent protection scope of the present utility model.

Claims (9)

1. A light detection system is characterized by comprising a light source, a first diaphragm, a light homogenizing unit, a polarization conversion unit, an LCD (liquid crystal display) plate and a detection unit which are sequentially arranged along a light path; wherein,

a light source generating a light beam;

the first diaphragm is used for adjusting the angle and the intensity of the light beam;

the dodging unit is used for dodging the light beam penetrating through the first diaphragm;

the polarization conversion unit outputs the light beams transmitted through the dodging unit into S-state polarized light or P-state polarized light;

the LCD panel receives the S-state polarized light or the P-state polarized light output by the polarization conversion unit;

and a detection unit for detecting the brightness of the light transmitted by the LCD panel.

2. A light detection system as claimed in claim 1, wherein the polarization conversion unit comprises a barrier, a PBS, and an 1/2 wave plate disposed in this order along the optical path; wherein,

a barrier filtering part of the light beam output from the dodging unit;

the PBS transmits P-state polarized light and reflects S-state polarized light;

1/2 wave plate, converts the P-state polarized light transmitted from the PBS into S-state polarized light.

3. A light detecting system according to claim 1, further comprising a first condenser lens disposed in an optical path between said polarization conversion unit and said LCD panel, for collecting S-state polarized light outputted from said polarization conversion unit to be incident on said LCD panel.

4. A light detecting system according to claim 3, further comprising a second aperture disposed in an optical path between said first condenser lens and said LCD panel for adjusting an angle and intensity of S-polarized light incident on said LCD panel.

5. A light detecting system according to claim 4, further comprising a second condenser lens disposed in an optical path between said first condenser lens and said second aperture, for focusing the S-state polarized light to be incident on said LCD panel.

6. A light detecting system according to claim 5, wherein said light unifying unit comprises a first fly-eye lens array facing the light source and a second fly-eye lens array facing away from the light sourceA second fly-eye lens array having a focal length f 'at which the light flux passing through the first fly-eye lens array is focused'_AThen, thenWherein A is the diameter of the light beam, W is the width of the LCD panel, f'_BThe focal length of the lens group formed by the second fly-eye lens array and the first condenser lens, or the focal length of the lens group formed by the second fly-eye lens array, the first condenser lens and the second condenser lens.

7. A light detection system as defined in claim 6,phi is the maximum deflection angle at which the light beam can enter the polarization conversion unit; the value of F/# is 1.6-2.4.

8. A light detection system as claimed in claim 1, wherein the light source is a laser, LED or light bulb.

9. A light detection arrangement, characterized in that the light detection arrangement comprises a light detection system as claimed in any one of claims 1 to 8.