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Touch display screen drive and fingerprint image acquisition method

A technology of touch screen and fingerprint image, applied in printing image acquisition, acquisition/organization of fingerprints/palmprints, instruments, etc. Low cost, low production cost and high signal-to-noise ratio

Active Publication Date: 2015-04-29
SYSU CMU SHUNDE INT JOINT RES INST
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  • Abstract
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Problems solved by technology

This not only increases the complexity and production cost of production, but also is not conducive to reducing power consumption, etc.

Method used

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  • Touch display screen drive and fingerprint image acquisition method
  • Touch display screen drive and fingerprint image acquisition method
  • Touch display screen drive and fingerprint image acquisition method

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Embodiment Construction

[0021] The accompanying drawings are for illustrative purposes only and cannot be construed as limiting the patent;

[0022] Such as figure 2 As shown, the double-gate photoelectric thin film transistor is a four-terminal device consisting of a photogate (Reset), a dark gate (Select), a source (Bias) and a drain (Data). When light is incident from the photogate At this time, the channel layer will absorb the incident light and generate a large number of photoelectrons. Under the action of the negative bias voltage of the photogate, the photoelectrons will drift to the dark gate and output after reaching the dark gate. It should be pointed out that there is a close relationship between the incident light and the generated photoelectrons, so the present invention proposes a method for driving a touch display screen and collecting a fingerprint image based on the working principle of a double-gate photoelectric thin film transistor. The principle is as figure 1 shown.

[0023...

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Abstract

The invention relates to a touch display screen drive and fingerprint image acquisition method. A display unit is driven through a bigrid photoelectric thin film transistor and fingerprint images are acquired. The display unit driving process specifically includes the following procedures that the zero voltage or the positive bias voltage is applied to an optical grid of the bigrid photoelectric thin film transistor, the positive voltage is applied to a dark grid, at the moment, display signals are sent to the display unit through the drain and the source of the bigrid photoelectric thin film transistor, and the display unit is driven through the display signals. The display unit fingerprint image acquisition process includes the following procedures that the negative bias voltage is applied to the optical grid, made of a transparent conductive material, of the bigrid photoelectric thin film transistor, the positive bias voltage is applied to the dark grid, and fingerprint images acquired by the bigrid photoelectric thin film transistor can be output through the source. Due to the fact that the method does not depend on a separation device, the method has the advantages that production cost is low, power consumption is low, and the signal to noise ratio and the resolution ratio of the acquired fingerprint images are high.

Description

technical field [0001] The present invention relates to the field of touch display drive, and more specifically, to a touch display drive and a fingerprint image collection method. Background technique [0002] With the popularization of smart phones and tablet computers, the human-computer interaction interface technology represented by touch screen has been widely favored by the public. In October 2013, Apple released a smart phone with fingerprint recognition function, which is another milestone application of human-machine interface technology in the electronic field. [0003] At present, more and more smart phone or tablet computer manufacturers have begun to research and launch fingerprint recognition technology and related products used on touch screen displays. At this time, the finger will reflect part of the light emitted by the display back to the liquid crystal back panel, so that the system can identify the fingerprint by using the photoelectric sensor to recei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F3/041
CPCG06F3/0412G06V40/1318
Inventor 王凯李明李昕杰弗里·瓦尔顿
Owner SYSU CMU SHUNDE INT JOINT RES INST
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