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Signal acquisition device, signal acquisition method, display device and electronic equipment

A signal collection and signal technology, applied in the fields of collection methods, signal collection devices, display devices and electronic equipment, can solve problems affecting user experience, affecting signal recognition effects such as fingerprints, etc., to improve signal collection quality and save signal collection time , to achieve the effect of miniaturization

Active Publication Date: 2020-03-27
CHIPONE TECH BEIJINGCO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like Figure 3(a) to Figure 3(c) As shown, when the above-mentioned signal acquisition device 100 is used for optical signal acquisition, the image before the acquisition will appear in the currently acquired image, which will affect the recognition effect of signals such as fingerprints, and further affect the user experience.

Method used

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  • Signal acquisition device, signal acquisition method, display device and electronic equipment
  • Signal acquisition device, signal acquisition method, display device and electronic equipment
  • Signal acquisition device, signal acquisition method, display device and electronic equipment

Examples

Experimental program
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Effect test

Embodiment 1

[0071] Figure 7 A schematic structural diagram of the sensing unit and the readout unit provided by the first embodiment of the present invention is shown.

[0072] In this embodiment, the process from signal acquisition to identification is described by taking one sensing unit 211 and some readout units 230 connected thereto as an example.

[0073] like Figure 7 As shown, the sensing unit 211 includes a photodiode D1, a first capacitor C1 and a thin film transistor TFT.

[0074] The first capacitor C1 is connected in parallel between the cathode and the anode of the photodiode D1, the anode of the photodiode D1 receives the reference voltage VB, the cathode is connected to the first channel end of the thin film transistor TFT, and the second channel end of the thin film transistor TFT is connected to the display panel 210 A source line of the TFT is connected to an analog front end of the readout unit 230 through the gate switch SRC_SEL, and the control end of the thin fi...

Embodiment 2

[0092] Figure 8 A schematic structural diagram of the sensing unit and the readout unit provided by the second embodiment of the present invention is shown.

[0093] like Figure 8 As shown, in this embodiment, the circuit structure and connection relationship of the sensing unit 211 and the reading unit 230 can be referred to Figure 7 described in , which is the same as Figure 7 The difference between the described first embodiment is that the collecting device 200 further includes a current limiting resistor R1. One end of the second switch LAG_SEL is grounded through the current limiting resistor R1 , and the other end of the second switch LAG_SEL is connected to the source line.

[0094] Further, the current limiting resistor R1 is shared by the plurality of second switches LAG_SEL, that is, one end of the current limiting resistor R1 is grounded, and the other end is connected to the corresponding plurality of thin film transistors TFT through the plurality of secon...

Embodiment 3

[0096] Figure 9 A schematic structural diagram of the sensing unit and the readout unit provided by the third embodiment of the present invention is shown.

[0097] like Figure 9 As shown, in this embodiment, the circuit structure and connection relationship of the sensing unit 211 and the reading unit 230 can be referred to Figure 8 In the description of the second embodiment, the difference from the above-mentioned second embodiment is that the current limiting resistor R1 is connected to the input path of the common reference power supply VB, and the reference voltage VB is transmitted to the anode of the photodiode D1 through the current limiting resistor R1 .

[0098] In the above-mentioned second and third embodiments, by designing the current limiting resistor R1, the power consumption in the circuit when the residual charge is cleared in the non-working state can be further reduced. For example, the current required by the circuit when the residual charge is clear...

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PUM

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Abstract

The invention discloses a signal acquisition device, a signal acquisition method, a display device and electronic equipment, and the acquisition device comprises: a display panel which comprises a plurality of source lines, a plurality of gate lines and a plurality of sensing units; a grid driving unit which is connected with the plurality of grid lines and is used for sequentially starting the plurality of sensing units; a reading unit which comprises a plurality of analog front ends, wherein each analog front end is connected with one or more source lines and used for reading electric signals of the started sensing unit; and at least one charge release unit connected with the plurality of source lines and used for providing a charge release path for the sensing unit in the sleep stage ofthe signal acquisition device. Charge residues on the photodiode sensor array are effectively removed in a non-working state of the chip, so that the signal acquisition time is saved, and the signalacquisition quality is improved.

Description

technical field [0001] The present invention relates to the field of optical touch technology, in particular to a signal collection device, a collection method, a display device and electronic equipment. Background technique [0002] In OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode) screens, the capacitive touch chip needs to use the sensor on the panel to complete the touch control, while the full-screen optical fingerprint recognition requires another layer of photodiode sensor array to complete the fingerprint recognition. identify. [0003] Optical fingerprint recognition usually uses the screen of the terminal device as the light-emitting body, irradiates the fingerprint through the optical path, and the returned light passes through the screen and returns to the image sensor under the screen. The terminal device analyzes and compares the returned image with the database to finally identify the fingerprint. Optical fingerprint recognition uses the pr...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06F3/041G06F3/044
CPCG06F3/0412G06F3/044G06V40/1306
Inventor 李伟江
Owner CHIPONE TECH BEIJINGCO LTD
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