Optical fingerprint recognition device forming method

A fingerprint identification and optical technology, applied in the field of image processing, can solve the problems of long optical path, high cost, poor accuracy, etc., and achieve the effect of reducing costs
CN105956545AActive Publication Date: 2016-09-21GALAXYCORE SHANGHAI
5 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GALAXYCORE SHANGHAI
Publication Date
2016-09-21

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention provides an optical fingerprint recognition device forming method, and the method comprises the steps: a silicon substrate is provided, a groove array is formed on the silicon substrate; a light transmission substrate and an image sensor chip are provided and bonded, a lens array is formed on the light transmission substrate through a gray-tone lithography method, and the lens array is corresponding to a photosensitive array of the image sensor chip; the groove surface of the silicon substrate is bonded with the light transmission substrate, the groove array is corresponding to the lens array, un-grooved surface of the silicon substrate is etched to expose the lens array, and a silicon diaphragm is formed between adjacent lens. According to the invention, the lens array can be formed through the gray-tone lithography method, the precise and complex lens production request can be met, the optical properties needed by an optical fingerprint recognition device can be accurately ensured, the method is suitable for portable electronic equipment and is compatible with the chip production and packaging technology in prior art, so that the cost can be reduced.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to the field of image processing, in particular to a method for forming an optical fingerprint identification device. Background technique

[0002] The current fingerprint identification schemes include optical technology, silicon technology (capacitive / radio frequency type), ultrasonic technology, etc.

[0003] Optical technology The use of optical imaging equipment is based on the principle of total reflection of light (FTIR). The light hits the surface of the glass with fingerprints, and the reflected light is obtained by the image sensor. The amount of reflected light depends on the depth of the fingerprint ridges and valleys pressed on the surface of the glass, as well as the oil and moisture between the skin and the glass. After the light is shot to the center of the valley through the glass, it is totally reflected at the interface between the glass and the air, and the light is reflected to the image sensor, while the lig...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More