CN210015317U

CN210015317U - Device for automatically detecting light attenuation of laser projector

Info

Publication number: CN210015317U
Application number: CN201921141048.9U
Authority: CN
Inventors: 周立; 蔡文君
Original assignee: Sichuan Changhong Electric Co Ltd
Current assignee: Sichuan Changhong Electric Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-02-04
Anticipated expiration: 2029-07-19

Abstract

The utility model relates to a laser projection technical field discloses an automatic detect device of laser projector light decay for detect the condition that laser brightness changes at any time, so that realize that follow-up regulation correlation parameter reaches colour temperature balance. The utility model comprises a photosensitive device, an ADC module, an MCU and a light source driving module; the photosensitive device is arranged on a light absorption surface of the DMD, is used for detecting the light beam absorbed by the whole laser beam due to the deflection of the DMD and is electrically connected with the ADC module; the ADC module is electrically connected with the MCU, and the MCU is electrically connected with the light source driving module. The utility model is suitable for a laser projector light decay control.

Description

Device for automatically detecting light attenuation of laser projector

Technical Field

The utility model relates to a laser projection technical field, in particular to automatic detect device of laser projector light decay.

Background

Laser projectors have been widely used in household projectors and engineering projection devices due to their long service life and excellent overall performance. At present, a laser display device uses a fluorescent wheel and a semiconductor laser light source as a display light source, under the irradiation of a high-power laser light source, output blue laser light is focused by a lens and is applied to fluorescent powders with different colors of the fluorescent wheel to generate red, green and blue light, and white with a specific color temperature is formed through a light combination system. With the use time, the phosphor layer will produce light attenuation after the working time is long, the brightness of red, green and blue is unbalanced, the displayed image will appear yellow, blue or red, the own color is lost, and the watching comfort is lost. At present, the detection of the brightness is the detection of a projection surface by a professional through an instrument to obtain related brightness data, and the use and debugging of the laser projector are not facilitated. If there is a device capable of detecting the change of light at any time, so as to realize the subsequent adjustment of relevant parameters to achieve color temperature balance, and it is necessary to improve the viewing comfort.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: a device for automatically detecting the light attenuation of a laser projector is provided, which is used for detecting the condition that the laser brightness changes at any time so as to realize the subsequent adjustment of relevant parameters to achieve color temperature balance.

In order to solve the above problem, the utility model adopts the following technical scheme: a device for automatically detecting the light decay of a laser projector comprises a photosensitive device, an ADC module, an MCU and a light source driving module; the photosensitive device is arranged on a light absorption surface of the DMD, is used for detecting the light beam absorbed by the whole laser beam due to the deflection of the DMD and is electrically connected with the ADC module; the ADC module is electrically connected with the MCU, and the MCU is electrically connected with the light source driving module.

Further, for the convenience of the real-time demonstration laser luminance of laser luminance and whether reach the light decay threshold value, the utility model discloses still can include image display module, image display module and MCU electric connection. The image display module can display the value of the laser brightness and the result of whether the light is attenuated in real time.

In particular, the photosensitive device may be a photodiode.

The utility model has the advantages that: by the automatic detection device for the light attenuation of the laser projector, after a corresponding software method is applied, the brightness change condition of light can be obtained, whether the light attenuation exists or not is judged, the brightness value of the light is displayed on a projection picture, and a signal whether the adjustment is needed or not is given.

Drawings

Fig. 1 is a schematic block diagram of an apparatus for automatically detecting light attenuation of a laser projector.

Fig. 2 is a schematic diagram of the positions of the light beams and the photosensors for automatically detecting the DMD mirror of the laser projector.

Detailed Description

The imaging of the laser projector is generally realized by reflecting light by a plurality of tiny mirrors, and taking a three-color laser projector as an example, the working principle is as follows: light generated by a light source is divided into red, green and blue tricolor light through a color wheel, the light of the light source is homogenized through a light bar and is subjected to light beam form conversion, then the homogenized light is irradiated onto a DMD through a relay optical system, a reflector, a TIR prism and other devices, imaging light (often called ON light) is reflected to enter a projection lens through modulation of the DMD and is projected onto a screen through the projection lens, and non-imaging light (often called OFF light) is reflected to the outside of the lens through modulation of the DMD.

In order to effectively solve present measurement laser projection luminance and can not be used for the inside regulation and the analysis of laser projector, difficult realization laser projector itself brightness compensation and the equilibrium of regulation color can not improve the problem of watching the comfort level, the utility model provides an automated inspection laser projector light decay device, automated inspection laser projector light decay device includes photosensitive element, ADC module, MCU, image display module and light source drive module and constitutes, and its principle picture frame picture refers to and sees figure 1, and wherein, photosensitive element puts in DMD's light-absorbing surface and refers to figure 2 to with ADC module electric connection, ADC module and MCU electric connection, MCU links to each other with image display module and light source drive module electric property respectively.

In the utility model, the photosensitive device can be used for checking the light beam (OFF light) absorbed by the whole laser beam due to the deflection of the DMD and converting the optical signal into an analog electrical signal; the ADC module can be used for converting the analog signal into a digital signal and transmitting the digital signal to the MCU for analysis; after the MCU obtains the digital signal, internal analysis and comparison can be carried out to obtain whether light attenuation exists or not, and an adjusting instruction is given to the laser driving module; the image display module can be used for displaying the value of the laser brightness and the result of whether the light is attenuated in real time.

The technical solution of the present invention will be described in detail with reference to the accompanying drawings and embodiments.

This embodiment automated inspection laser projector light decay device comprises photodiode, ADC module, MCU, image display module and light source drive module, and wherein, photodiode puts in the light-absorbing face of DMD to with ADC module electric connection, ADC module and MCU electric connection, MCU links to each other with image display module and light source drive module electrical property respectively.

In the above-mentioned device, in order not to affect the ON light entering the lens for imaging, as shown in fig. 2, in the embodiment, the photodiode is used to detect the brightness of the OFF light ON the absorbing surface of the DMD, and the brightness signal is converted into an analog signal, the ADC module converts the obtained analog signal into a digital signal and transmits the digital signal to the MCU, and the MCU analyzes and compares the obtained data. And a reference brightness value in the MCU is A, the positive and negative a of the range are determined to be normal, the collected data are B, the A and the B are compared, whether the light attenuation exists or not is judged, the result and the B value are sent to the image display module to be displayed, and a debugging signal is given to the light source driving module to judge whether the light source driving needs to be adjusted or not.

In the embodiment, the MCU can acquire the brightness in real time and also can set interval acquisition, so that the brightness of the laser projector can be automatically checked, and the condition of light attenuation can be obtained. This example is not further enumerated.

Claims

1. The device for automatically detecting the light decay of the laser projector is characterized by comprising a photosensitive device, an ADC (analog to digital converter) module, an MCU (micro control unit) and a light source driving module; the photosensitive device is arranged on a light absorption surface of the DMD, is used for detecting the light beam absorbed by the whole laser beam due to the deflection of the DMD and is electrically connected with the ADC module; the ADC module is electrically connected with the MCU, and the MCU is electrically connected with the light source driving module.

2. The apparatus of claim 1, further comprising an image display module electrically connected to the MCU.

3. The apparatus according to claim 1 or 2, wherein the light-sensitive device is a photodiode.