Laser display device and manufacturing method thereof

Abstract

A high-resolution laser display device. The device has a micro-cavity laser array which is formed by arrangement of a plurality of groups of RGB micro-cavity lasers, each group of RGB micro-cavity lasers consists of three micro-cavity lasers, a single light source is used as an excitation source to excite laser array to obtain RGB laser, a matched transmission type liquid crystal screen is utilized to perform color mixing on RGB pixel laser, thereby realizing gray scale control of an entire pixel, RGB micro-cavity emergent light is laser, the advantages of wide color gamut and high saturation degree of laser display are retained, and in the display device a display pixel is not projected and amplified, thereby facilitating realization of an image of high-definition image quality. In addition, since the micro-cavity lasers are mutually independent, and coherence stack of emergent light does not occur, a complex laser-speckle-eliminating device is no longer needed.

Description

technical field [0001] The invention relates to the field of laser display, in particular to a red, green and blue microcavity laser array and a high-resolution laser display device based on the laser array. Background technique [0002] Laser display technology refers to the technology that uses laser light as a light source to realize the information display function. Because the laser itself has the advantages of good monochromaticity, good directionality and high brightness, it is suitable for use as a display light source. Compared with other existing display technologies, laser display technology has the advantages of large color gamut space, high image quality, energy saving and environmental protection, and easy combination with 3D technology. Laser technology is therefore known as the fourth-generation display technology after the first-generation display technology of CRT (cathode ray tube), the second-generation display technology of liquid crystal and plasma, an...

AI Technical Summary

Problems solved by technology

For example, a high-definition screen with 1080 lines and a refresh rate of 50 times per second requires 54,000 scans per second, and the corresponding prism wheel speed needs to reach 405,000 revolutions per minute. The noise, lubrication, cost and life of such a high speed are all Difficult to meet the conditions for market application

Chinese patent CN1125881A proposes a laser display system combining a galvanometer scanner and an acousto-optic modulator, which can greatly increase the scanning speed, but the operation is difficult and the cost is high

Minimum pixel size = light valve pixel size x projection multiple, so this technology cannot project 4K resolution videos, the highest quality level can only reach 1080P

In addition, the entire system requires RGB three-color lasers and complex speckle elimination devices, which undoubtedly increases the complexity and cost of the device, and causes great difficulties in realizing the miniaturization and large-scale practical use of the device.

Chinese patent CN1900805A discloses a method of using a single red laser to obtain red, green and blue color laser display light sources. This patent uses two frequency conversion crystals and three light intensity adjustment scanning controllers to achieve this purpose, which is costly and difficult to control.

Chinese patent CN104166300A proposes to use temperature control to adjust the output wavelength of RGB three-color semiconductor lasers, so as to realize the largest possible chromaticity triangle area, but it does not solve the problem of large price and large volume in projection laser display

Chinese patent CN103412406A proposes an area array light source for laser display, including an area array of red light vertical cavity surface-emitting semiconductor lasers and a microlens array, which can shorten the length of the illumination optical path, improve light energy utilization, and weaken laser speckle. Not available for color laser display

[0006] Laser phosphor display technology requires only a single beam of blue laser for excitation, but since the RGB light emitted by the phosphor is not laser and has an impure spectrum, it has lost the original laser display color gamut light and high color saturation. Advantages, in essence, this technology cannot be summarized in the field of laser display, and it still uses the scanning working method, and the specific implementation process is complicated

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