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Optical fingerprint navigation device with light guide film

A technology of optical finger navigation and light guide film, which is applied in the coupling of optical waveguides, the input/output process of data processing, instruments, etc., and can solve the problem of physical space reduction

Active Publication Date: 2014-06-25
PIXART IMAGING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the size of conventional navigation devices decreases, so does the physical space available for imagers to detect optical navigation inputs

Method used

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  • Optical fingerprint navigation device with light guide film
  • Optical fingerprint navigation device with light guide film
  • Optical fingerprint navigation device with light guide film

Examples

Experimental program
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Embodiment Construction

[0022] In some embodiments the film is used as a light guide. Light guiding films (LGF) are thinner than conventional light guides, and thus LGF can be used to make thinner optical finger navigation devices. Additionally, in some embodiments, the LGF includes non-planar elements that enhance scattered light from the LGF. Non-planar elements interact with the finger to alter the scattering of light. The geometry of the non-planar elements increases the amount of light leaving the LGF; therefore, the image detected by the sensor is stronger and easier to detect. Therefore, the amount of light fed to the LGF can be reduced and battery power can be saved. A sensor detects the altered scattering of light.

[0023] figure 1 A perspective view of one embodiment of a user input device in the form of an optical finger navigation device 100 is depicted. The optical finger navigation device 100 includes a light guiding film (LGF) 102 , one or more light sources 104 and a sensor 106 ...

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PUM

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Abstract

An optical finger navigation device. Embodiments of the optical finger navigation device include a light guide film (LGF) including a finger interface surface, a light source in optical communication with the LGF to provide light from the light source to the finger interface surface, a sensor, and a navigation engine. At least a portion of the LGF exhibits total internal reflection (TIR). The sensor detects light from the LGF in response to contact between a finger and the finger interface surface which modifies reflection of light out of the LGF to the sensor. The light detected by the sensor is changed over at least a portion of the sensor in response to the contact between the finger and the finger interface surface. The navigation engine is configured to generate lateral movement information indicative of lateral movement of the finger relative to the sensor, in response to the detected light.

Description

technical field [0001] The invention relates to an optical fingerprint navigation device with a light guiding film. Background technique [0002] Optical navigation devices use a light source to illuminate the navigation surface so that an optical imager can generate digital images that are used to calculate motion. For example, an optical imager may image a finger on a surface and generate a navigation signal based on a comparison of successive images. However, as the size of conventional navigation devices decreases, so does the physical space available for imagers to detect optical navigation inputs. [0003] Some conventional optical navigation device packages have a thickness (or optical height) of about 2.5mm. Optical height refers to the distance from the optical finger interface surface to the corresponding sensor. Optical height is also known as optical locus. An optical trace (or height) of 2.5mm is considered too thick for some embodiments of handheld devices,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/042G06K9/00
CPCG06F2203/04109G06K9/00046G06F3/042G06F2203/0338G06F3/03547G02B6/24Y10T156/10G06V40/1324
Inventor 加里·R·托特
Owner PIXART IMAGING INC