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Tunable light projector and tunable light detector

A light projector, adjustable technology, used in lasers, semiconductor lasers, instruments, etc., can solve the problems of space occupation and expensive

Pending Publication Date: 2021-06-04
LIQXTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using two systems (i.e. floodlight system and structured light system) in one mobile device takes up a lot of space and is expensive

Method used

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  • Tunable light projector and tunable light detector
  • Tunable light projector and tunable light detector
  • Tunable light projector and tunable light detector

Examples

Experimental program
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Embodiment Construction

[0044] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and descriptions to refer to the same or like parts.

[0045] In addition, for ease of description, terms such as "underlying", "below", "lower", "overlying", "upper", "top" may be used herein. "top", "bottom", "left", "right" and the like are used to describe one element or feature compared to another element as shown in the figures or feature relations. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0046] Figure 1A is a schematic cross-sectional view of an adjusta...

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PUM

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Abstract

A tunable light projector including the following is provided. A light source is configured to emit a light beam. A fixed optical phase modulator is disposed on a path of the light beam and is configured to modulate phases of the light beam. A tunable liquid crystal panel is disposed on the path of the light beam and a partial region of the tunable liquid crystal panel is configured to electrically switch the light beam between a structured light and a flood light. A driver is configured to control the light source and control the tunable liquid crystal panel to switch the light beam between the structured light and the flood light. The tunable liquid crystal panel includes: a first substrate; a second substrate; a liquid crystal layer; a first electrode layer; and a second electrode layer.

Description

technical field [0001] The present invention relates to a light projector and a sensing device, and in particular to an optical sensing device, a structured light projector and an adjustable light projector. Background technique [0002] Currently, mainstream technologies of 3D sensing are divided into time of flight (TOF) and structured illumination. TOF technology uses a pulsed laser (pulsed laser) and a complementary metal oxide semiconductor (CMOS) sensor to measure light reflection time and convert it into distance. Due to cost and structure, it is generally more suitable for long-distance object analysis. In structured light technology, an infrared light source (IR source) is used to project onto a diffractive optical element (DOE) to generate a two-dimensional diffraction pattern, and a sensor is used to collect reflected light. The three-dimensional distance of an object can be converted using trigonometry. Structured light technology is limited to a projection le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1343G02F1/133G02F1/13357G02F1/1335G02F1/1337G02F1/1334G06K9/00
CPCG02F1/1343G02F1/13306G02F1/1336G02F1/133509G02F1/133528G02F1/1337G02F1/13439G02F1/1334G02F1/133504G02F1/133526G06V40/161G03B21/20G03B21/005G03B21/2033H01S5/4031H01S5/183
Inventor 吴炳升陈宏山陈明璿
Owner LIQXTAL TECH