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laser projection equipment

A technology of laser projection and equipment, which is applied in the field of projection display, can solve the problems of poor image display quality of laser projection equipment and permanent damage to lasers, etc., and achieve the effects of eliminating COD failures, ensuring image display effects, and reducing damage rates

Active Publication Date: 2021-07-30
QINGDAO HISENSE LASER DISPLAY CO LTD
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AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present disclosure provides a laser projection device, which can solve the problems in the related art that the long-term COD failure of the laser causes permanent damage to the laser, and the image display quality of the laser projection device deteriorates.

Method used

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Embodiment Construction

[0017] In order to make the purpose, technical solution and advantages of the present disclosure clearer, the implementation manners of the present disclosure will be further described in detail below in conjunction with the accompanying drawings.

[0018] figure 1 It is a schematic diagram of the output characteristics of a laser when a COD fault occurs in the laser provided by the related art. The schematic diagram includes a first curve and a second curve, the first curve is a variation curve of the driving voltage of the laser, and the second curve is a variation curve of the driving current of the laser. The abscissa in the schematic diagram is the driving current, the first ordinate is the luminous power of the laser, and the second ordinate is the driving voltage of the laser. Wherein, the unit of driving current is ampere (A), the unit of luminous power is milliwatt (mW), and the unit of driving voltage is volt (V).

[0019] refer to figure 1 1. During the working p...

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Abstract

The present application discloses a laser projection device, including multiple groups of lasers. By setting a brightness sensor in the light output path of the laser light source, the brightness sensor can detect the first brightness value of the laser light source and send the first brightness value to the display control circuit. . The display control circuit can obtain the second brightness value corresponding to the driving current of each laser, and when the difference between the second brightness value of the laser and the first brightness value of the laser is greater than the difference threshold, determine that the laser has COD Fault. Then the display control circuit can adjust the current control signal of the corresponding laser drive component of the laser until the difference is less than or equal to the difference threshold, which can eliminate the COD failure of the laser in time, reduce the damage rate of the laser, and ensure the laser projection equipment. Image display effect.

Description

technical field [0001] The present disclosure relates to the field of projection display, in particular to a laser projection device. Background technique [0002] At present, due to the advantages of strong monochromaticity, high brightness, and rich color gamut, lasers are gradually used as light sources for projection equipment. The laser light source usually includes multiple semiconductor laser diodes. The laser diode excites the active region by energizing the PN junction, forming a resonant cavity, and forming a stable oscillation, thereby emitting a single wavelength of laser light. Among them, the PN junction is grown on the nitride growth substrate, and the lasers of different colors are related to different nitride substrates. [0003] In the related art, when the laser in the laser projection device emits laser light, the semiconductor junction of the laser exceeds the power density and causes overload, so that the cavity surface of the laser is subjected to a l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/20
CPCG03B21/2013G03B21/2033G03B21/2053
Inventor 崔荣荣曹利明
Owner QINGDAO HISENSE LASER DISPLAY CO LTD
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