A curvable silicon retinal implant

Dinyari, Rostam; Loudin, James; Huie, Phil; Palanker, Daniel; Peumans, Peter

doi:10.1109/iedm.2009.5424291

Cited by 11 publications

(6 citation statements)

References 6 publications

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“…The first one is patterning the circuit on flat substrate, followed by deforming the substrate into desired curved shape. [4,[20][21][22] This method can use the mature semiconductor patterning techniques developed for silicon wafer before the substrate deformation. However, due to the brittle nature of the conventional substrates such as silicon or glass, the strain that can be introduced during the substrate deformation can cause permanent damage and/or modify the devices and circuits performance.…”

Section: D Printed Masks and Transfer Stamping Process To Enable The Fabrication Of The Hemispherical Organic Photodiodesmentioning

confidence: 99%

3D Printed Masks and Transfer Stamping Process to Enable the Fabrication of the Hemispherical Organic Photodiodes

Kim

Moon

Kanicki

2017

Adv Materials Technologies

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Organic PhotodiodesToday, most of the current image sensors and cameras are based on flat focal plane array (FPA) technology, including charge coupled devices (CCDs), complementary metal oxide semiconductor (CMOS) imager, or thin film transistors (TFTs) arrays on glass substrates. [1][2][3] The planar FPA requires complex multielement lenses to correct the image surface; i.e., the Petzval surface. [4] The nonidealities of the optical system can lead to a distorted and blurred image due to off-axis aberrations. To correct these problems, additional optical elements and high precision lens system are required, which result in complex and expensive optical system. Compared to the camera system with the flat FPA, a curved image surface mimicking a spherical human retina provides numerous advantages. [5] The image system with the curved image surface can provide a wide field of view (FOV), a low optical aberration, low 1/f number and less optical lens components leading to compact, cheaper, and lighter camera system. [4,6,7] Over the years, the fabrication of image sensors on curved surface has long been a challenging task among researchers due to the difficulty of developing fabrication methods suitable for curved surfaces. To name a few, Ko et al. developed a

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Section: D Printed Masks and Transfer Stamping Process To Enable The Fabrication Of The Hemispherical Organic Photodiodesmentioning

confidence: 99%

3D Printed Masks and Transfer Stamping Process to Enable the Fabrication of the Hemispherical Organic Photodiodes

Kim

Moon

Kanicki

2017

Adv Materials Technologies

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“…3D (three-dimensional) surfaces can be made through stress-induced instabilities [13,14], or bending soft-springconnected islands to conform to the non-planar surface [15]. In this research, we report a novel non-planar flexible silicon chip technology by combination of patterning high residual stress thin films on top of a shaped thin silicon substrate.…”

Section: Introductionmentioning

confidence: 99%

A contact-lens-shaped IC chip technology

Liu¹,

Yang²,

Teng³

et al. 2014

J. Micromech. Microeng.

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We report on novel contact-lens-shaped silicon integrated circuit chip technology for applications such as forming a conforming retinal prosthesis. This is achieved by means of patterning thin films of high residual stress on top of a shaped thin silicon substrate. Several strategies are employed to achieve curvatures of various amounts. Firstly, high residual stress on a thin film makes a thin chip deform into a designed three-dimensional shape. Also, a series of patterned stress films and ‘petal-shaped’ chips were fabricated and analyzed. Large curvatures can also be formed and maintained by the packaging process of bonding the chips to constraining elements such as thin-film polymer ring structures. As a demonstration, a complementary metal oxide semiconductor transistor (CMOS) image-sensing retina chip is made into a contact-lens shape conforming to a human eyeball 12.5 mm in radius. This non-planar and flexible chip technology provides a desirable device surface interface to soft tissues or non-planar bio surfaces and opens up many other possibilities for biomedical applications.

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“…The patients lose their vision due to the degeneration of photoreceptors in spite of the fact that there is no problem with the rest of the visual pathway to the brain. In order to restore vision in these patients, prosthetic systems have been proposed to replace the cells that have degenerated [4]. One possible prosthetic system is the retinal chip implant [5].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of a broad band spectral head-mounted display with freeform mirrors

et al. 2014

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It has been demonstrated that electrical stimulation of the retina can produce visual perception for blind patients suffering from macular degeneration and retinitis pigmentosa. In order to let the retinal chip generate enough electrical stimulation, the near infrared ray source is added to enhance the stimulation current. However, it is a challenge to design a head-mounted display (HMD) that covers both visible and infrared rays. Since the HMD system covers such a broad spectral band, large color aberrations will be induced. In order to eliminate these large aberrations, a mirror system is adopted that will create a no color aberration system. We also use two freeform mirrors (FFMs) to reduce residual aberrations such as spherical aberrations and coma. The FFMs serve as the near-eye viewing optics that magnifies the image which is displayed through a microdisplay. Based on a 0.61 in. microdisplay, the HMD system demonstrates a diagonal field of view (FOV) of 30 degree and an f/# of 3.75, with an exit pupil diameter of 8 mm and eye clearance of 15mm.

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A curvable silicon retinal implant

Cited by 11 publications

References 6 publications

3D Printed Masks and Transfer Stamping Process to Enable the Fabrication of the Hemispherical Organic Photodiodes

3D Printed Masks and Transfer Stamping Process to Enable the Fabrication of the Hemispherical Organic Photodiodes

A contact-lens-shaped IC chip technology

Demonstration of a broad band spectral head-mounted display with freeform mirrors

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