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However, achieving biomimetic threat\u2010distance adaptation, where escape initiation dynamically calibrates to looming object proximity within a single device as in insect neural circuits, remains challenging for bionic vision systems implementations. Herein, we present a vision sensor based on a 2D PVK\/h\u2010BN\/MoS\n                    <jats:sub>2<\/jats:sub>\n                    \/h\u2010BN\/2D PVK heterostructure that achieves full dynamic emulation of insect phototactic\/scototactic behaviors. The core innovation is symmetrical gate\u2010field co\u2010regulation, opposing gate biases on the top and bottom 2D PVK photosensitive layers trigger antagonistic field\u2010effect modulation in response to light gradients. Low light intensity activates the top layer, inducing persistent positive photocurrent (PPC) via hole\/cation accumulation, while high light intensity activates the bottom layer, generating negative photoconductivity (NPC) via electron\/anion accumulation, mimicking adjacent ommatidial excitation\/inhibition. Hopping\u2010like ion transport enables ultra\u2010long PPC\/NPC persistence post\u2010illumination. An autonomous obstacle avoidance system built with this sensor directly maps light\u2010gradient signals to motor commands enabling voltage\u2010tunable braking distance control via symmetric gate differential modulation, co\u2010processing real\u2010time intensity, historical accumulation, and rate\u2010of\u2010change for efficient collision avoidance in dynamic environments. This work provides a valuable reference scheme for bionic vision systems.\n                  <\/jats:p>","DOI":"10.1002\/adma.73694","type":"journal-article","created":{"date-parts":[[2026,6,10]],"date-time":"2026-06-10T15:21:09Z","timestamp":1781104869000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Light Intensity\u2010Driven Bidirectional Photoresponse Vision Sensor for Autonomous Obstacle Avoidance System"],"prefix":"10.1002","volume":"38","author":[{"given":"Zhen","family":"Liu","sequence":"first","affiliation":[{"name":"School of Optoelectronic Engineering Henan Key Laboratory of Advanced Semiconductor &amp; Functional Device Integration Henan Key Laboratory of Infrared Materials &amp; Spectrum Measures and Applications Henan Normal University  Xinxiang Henan China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sen","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Physics and Electronics Key Laboratory for Micro\/Nano Optoelectronic Devices of Ministry of Education &amp; Hunan Provincial Key Laboratory of Low\u2010Dimensional Structural Physics and Devices Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4134-8551","authenticated-orcid":false,"given":"Pingdan","family":"Xiao","sequence":"additional","affiliation":[{"name":"College of Computer Science and Electronic Engineering Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wanru","family":"Kong","sequence":"additional","affiliation":[{"name":"College of Semiconductors (College of Integrated Circuits) Hunan University  Changsha China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hanzhen","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Semiconductors (College of Integrated Circuits) Hunan University  Changsha 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