Optical touch control screen integrating touch control and fingerprint recognition
An optical touch screen, fingerprint recognition technology, applied in character and pattern recognition, acquisition/organization of fingerprints/palmprints, print image capture, etc., can solve the problems of reducing image contrast, easily missed touch points, and high cost of emitting backlight light sources , to achieve the effect of reducing the diffraction angle, improving the touch sensitivity and increasing the coupling efficiency
Active Publication Date: 2017-07-11
SHANGHAI JIAO TONG UNIV
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But similarly, the cost of the infrared emitting backlight source is high, and since the infrared backlight source is generally a point backlight source, it needs a certain thickness and length to allow the light to be evenly distributed, which cannot meet the requirements of thinness and small size portability.
[0003] None of the above-mentioned touch screens can meet the requirements of detecting the user's fingerprint while generating touch control.
Chinese patent CN104751121A discloses an optical waveguide fingerprint recognition system based on a grating structure, but it allows the separation of detection area units. This method of non-full surface arrangement of detection area units is not suitable for touch control, and it is easy to miss touch detection. Control points; and the detection area units are not allowed to overlap, which will cause a very large total reflection angle, making it more difficult for fingerprints to destroy total reflection, reducing the contrast of the image, and resulting in an increase in the CCD area, making the entire Device cost becomes higher
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[0029] The present invention will be described in detail below in conjunction with the embodiments and accompanying drawings, but the protection scope of the present invention should not be limited thereby.
[0030] see first figure 1 , as can be seen from the figure, the optical touch screen of the present invention integrates touch control and fingerprint recognition, including a backlight light source 200, an optical waveguide 202, a grating 201, a liquid crystal display module 203 and an image sensor 204, and the optical waveguide 202 is located in the backlight Above the light source 200, the grating 201 is arranged on two adjacent sides of the optical waveguide 202, and an array image sensor 204 is arranged on the other two adjacent sides of the optical waveguide 202. The liquid crystal display module 203 is located between the backlight light source 200 and the optical waveguide 202, the upper surface of the optical waveguide 202 is the detection area 205, and the finge...
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The invention relates to an optical touch control screen integrating touch control and fingerprint recognition. The optical touch control screen comprises a back light source, a light waveguide, a grating, a liquid crystal display module and an image sensor, wherein the sensor is used for judging a touch control generating position according to light intensity; fingerprint information is obtained through an image received by the sensor. Through the use of overlapping detection light, while a fingerprint is collected, the touch control sensitivity is improved; the optical touch screen integrates the fingerprint recognition and the touch control, and has the characteristics of safety, ultrathin appearance, high imaging quality and low cost.
Description
technical field [0001] The invention relates to an optical touch screen, in particular to an optical touch screen integrating touch control and fingerprint recognition. Background technique [0002] According to different technical principles, touch screens can be classified into: resistive touch screen, capacitive touch screen, surface acoustic wave touch screen and infrared touch screen. Resistive touch screens have the advantages of not being afraid of pollution and low cost, but they are not wear-resistant, have low light transmittance and slow response speed; surface acoustic wave touch screens are poor in anti-fouling, the transmitting transducer is fragile, and have a short service life; capacitive touch screens are resistant to electromagnetic interference Poor, requires conductors for touch control, limited use environment, and high environmental requirements for temperature, humidity and grounding. The infrared touch screen has no effect on human eyes because of t...
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Login to View More IPC IPC(8): G06F3/041G06F3/042G06K9/00
CPCG06F3/0412G06F3/0421G06V40/1318
Inventor 叶志成马萍郑君
Owner SHANGHAI JIAO TONG UNIV