CN-115855778-B - Liquid drop position detection device and detection method

CN115855778BCN 115855778 BCN115855778 BCN 115855778BCN-115855778-B

Abstract

The invention discloses a liquid drop position detection device and a detection method, and relates to the technical field of display. The liquid drop position detection device comprises a driving detection substrate, wherein the driving detection substrate comprises an MCU processing module and a liquid drop position detection module which are electrically connected, the MCU processing module is used for sending detection signals to the liquid drop position detection module, the liquid drop position detection module is used for receiving the detection signals and acquiring node voltages in a detection loop and generating corresponding target data signals according to the node voltages, and the MCU processing module is also used for determining liquid drop positions according to a plurality of the target data signals and preset values. In the embodiment provided by the invention, the MCU processing module and the liquid drop position detection module are arranged on the drive detection substrate, and the MCU processing module determines the liquid drop position by sending detection signals to the liquid drop position detection module and acquiring and analyzing target data signals returned by the liquid drop position detection module.

Inventors

SU PING
LIU ZHEN
CHEN XIAO
JIANG HUIHUI
Li Aowen

Assignees

上海天马微电子有限公司

Dates

Publication Date: 20260505
Application Date: 20221209

Claims (13)

1. A liquid drop position detecting device is characterized by comprising a drive detection substrate; The driving detection substrate comprises an MCU processing module and a liquid drop position detection module which are electrically connected; The MCU processing module is used for sending a detection signal to the liquid drop position detection module; The liquid drop position detection module is used for receiving the detection signal, acquiring node voltage in a detection loop and generating a corresponding target data signal according to the node voltage; the MCU processing module is also used for determining the positions of liquid drops according to a plurality of target data signals and preset values; The device also comprises a microfluidic substrate; the microfluidic substrate is electrically connected with the drive detection substrate; the microfluidic substrate is provided with a plurality of driving electrodes which are arranged in an array manner, and the driving electrodes and the liquid drop position detection module which are arbitrarily adjacent form a detection loop; the drive detection substrate further comprises a liquid drop drive module; the MCU processing module is used for sending a driving signal to the liquid drop driving module; The liquid drop driving module is electrically connected with the driving electrode of the microfluidic substrate, and is used for receiving the driving signal and applying driving voltage to the driving electrode.
2. The liquid droplet position detection apparatus according to claim 1, wherein the drive detection substrate is an IC chip; the IC chip is bound to the binding region of the microfluidic substrate.
3. The liquid droplet position detection apparatus according to claim 1, wherein the drive detection substrate is a PCB substrate; One end of the microfluidic substrate is provided with a plurality of probes, one end of the PCB substrate, which is close to the microfluidic substrate, is provided with a plurality of bonding pads corresponding to the probes, and the probes are electrically connected with the bonding pads.
4. The drop position detection device of claim 3, further comprising a flexible circuit board; the flexible circuit board is bound to the binding area of the microfluidic substrate, and the PCB substrate is electrically connected with the flexible circuit board.
5. The liquid drop position detecting device according to claim 1, wherein, The input end of the liquid drop driving module is electrically connected with the first output end of the MCU processing module, and the output end of the liquid drop driving module is electrically connected with the driving electrode of the microfluidic substrate.
6. The drop position detection device of claim 1, wherein the drop position detection module comprises a multiplexing module, a detection circuit module, a rectifying and filtering module, and an ADC sampling module; The input end of the multi-path selection module is electrically connected with the second output end of the MCU processing module, the first output end of the multi-path selection module is electrically connected with the microfluidic substrate, and the second output end of the multi-path selection module is electrically connected with the input end of the detection circuit module; the output end of the detection circuit module is electrically connected with the input end of the rectifying and filtering module; The output end of the rectifying and filtering module is electrically connected with the input end of the ADC sampling module; the output end of the ADC sampling module is electrically connected with the input end of the MCU processing module; the multi-path selection module is used for forming the detection loop with any adjacent driving electrode according to the detection signals sent by the MCU processing module; The detection circuit module is used for acquiring the node voltage of the second output end of the multi-path selection module and generating a first signal according to the node voltage; The rectification filter module is used for converting the first signal into a second signal; and the ADC sampling module is used for converting the second signal into the target data signal.
7. The drop position detection device of claim 6, wherein the detection circuit module comprises a waveform generation module and an amplification module electrically connected; The input end of the waveform generation module is electrically connected with the second output end of the multi-path selection module, and the output end of the waveform generation module is electrically connected with the input end of the amplifying module; The output end of the amplifying module is electrically connected with the input end of the rectifying and filtering module; the waveform generation module is used for acquiring the node voltage of the second output end of the multi-path selection module and generating a third signal according to the node voltage; the amplifying module is used for converting the third signal into a first signal.
8. The drop position detecting device of claim 6, wherein the number of channels of the multiplexing module is equal to the number of the driving electrodes, each channel of the multiplexing module is electrically connected to one of the driving electrodes, and the same driving electrode is electrically connected to one channel of the multiplexing module.
9. The drop position detecting device of claim 6, wherein the number of channels of the multiplexing module is smaller than the number of the driving electrodes, and each channel of the multiplexing module is electrically connected to one of the driving electrodes, and the same driving electrode is electrically connected to one channel of the multiplexing module.
10. The droplet position detection apparatus according to claim 7, wherein a voltage value of the third signal is v3=k1×cx+va; Wherein k1 is used for representing a first coefficient of the waveform generation module, cx is used for representing the inter-plate capacitance between any adjacent driving electrodes, va is used for representing a first node voltage; or, the voltage value of the third signal is v3=k2×cx+vb; wherein k2 is used for representing a second coefficient of the waveform generation module, cx is used for representing the inter-plate capacitance between any adjacent driving electrodes, and Vb is used for representing a second node voltage.
11. The apparatus for detecting a position of a droplet according to claim 10, wherein, When the voltage value of the third signal is v3=k1×cx+va, the voltage value of the first signal is v1= (1+h/Rd) × (V3-Va); When the voltage value of the third signal is v3=k2×cx+vb, the voltage value of the first signal is v1= (1+h/Rd) × (V3-Vb); wherein h is used for representing the coefficient of the amplifying module, and Rd is used for representing the reference resistance of the amplifying module.
12. A liquid drop position detection method is characterized in that a liquid drop position detection device comprises a microfluidic substrate and a drive detection substrate; The microfluidic substrate comprises a plurality of driving electrodes which are arranged in an array manner; the driving detection substrate comprises an MCU processing module, a multi-path selection module, a detection circuit module, a rectification filter module and an ADC sampling module, and further comprises a liquid drop driving module; the liquid drop position detection method comprises the following steps: the MCU processing module sends a detection signal to the multi-path selection module; the multi-path selection module receives the detection signals and forms a detection loop with any adjacent driving electrode; The detection circuit module acquires node voltage of a second output end of the multi-path selection module, generates a first signal according to the node voltage, and sends the first signal to the rectification filter module; The rectification filter module receives the first signal, converts the first signal into a second signal and sends the second signal to the ADC sampling module; the ADC sampling module receives the second signal, converts the second signal into a target data signal and sends the target data signal to the MCU processing module; the MCU processing module is used for receiving the target data signals, comparing a plurality of target data signals with a preset value and determining the positions of liquid drops; the liquid drop position detection method further includes: the MCU processing module sends a driving signal to the liquid drop driving module; the liquid drop driving module is electrically connected with the driving electrode of the microfluidic substrate, receives the driving signal and applies driving voltage to the driving electrode.
13. The liquid drop position detection method according to claim 12, further comprising: When the MCU processing module sends a driving signal to the liquid drop driving module, the MCU processing module sends a disconnection signal to the multi-path selection module; when the MCU processing module sends out a detection signal to the multi-path selection module, the MCU processing module sends out a high-resistance state signal to the liquid drop driving module.

Description

Liquid drop position detection device and detection method Technical Field The invention relates to the technical field of display, in particular to a liquid drop position detection device and a detection method. Background Microfluidic substrates are a scientific technology characterized by the manipulation of fluids in the micro-nano scale space. The basic principle is that when one liquid drop is positioned right above an electrode, if a first voltage is applied to the motor, a second voltage is applied to an adjacent electrode, and when the second voltage is larger than the first voltage and the pressure difference reaches a certain value, the liquid drop can move from the electrode to the adjacent electrode. In the related art, a microfluidic substrate cannot track the positions of droplets on the substrate in real time. Calibration remedial measures cannot be taken when the drop position is shifted. Disclosure of Invention In view of the above, the present invention provides a droplet position detecting device and a detecting method, which can detect the position of a droplet on a microfluidic substrate. In a first aspect, the present invention provides a droplet position detecting apparatus comprising a drive detecting substrate; The driving detection substrate comprises an MCU processing module and a liquid drop position detection module which are electrically connected; The MCU processing module is used for sending a detection signal to the liquid drop position detection module; The liquid drop position detection module is used for receiving the detection signal, acquiring node voltage in a detection loop and generating a corresponding target data signal according to the node voltage; The MCU processing module is also used for determining the positions of liquid drops according to the target data signals and the preset value. In a second aspect, the present invention provides a droplet position detection method, the droplet position detection device comprising a microfluidic substrate and a drive detection substrate; The microfluidic substrate comprises a plurality of driving electrodes which are arranged in an array manner; the driving detection substrate comprises an MCU processing module, a multipath selection module, a detection circuit module, a rectification filtering module and an ADC sampling module; the liquid drop position detection method comprises the following steps: the MCU processing module sends a detection signal to the multi-path selection module; the multi-path selection module receives the detection signals and forms a detection loop with any adjacent driving electrode; The detection circuit module acquires node voltage of a second output end of the multi-path selection module, generates a first signal according to the node voltage, and sends the first signal to the rectification filter module; The rectification filter module receives the first signal, converts the first signal into a second signal and sends the second signal to the ADC sampling module; the ADC sampling module receives the second signal, converts the second signal into a target data signal and sends the target data signal to the MCU processing module; and the MCU processing module is used for receiving the target data signals, comparing a plurality of target data signals with a preset value and determining the positions of liquid drops. Compared with the prior art, the liquid drop position detection device and the detection method provided by the invention have the advantages that at least the following effects are realized: in the embodiment provided by the invention, the MCU processing module and the liquid drop position detection module are arranged on the drive detection substrate, and the MCU processing module determines the liquid drop position by sending detection signals to the liquid drop position detection module and acquiring and analyzing target data signals returned by the liquid drop position detection module. The embodiment provided by the invention can acquire the positions of the liquid drops in real time and correct the positions of the liquid drops in time when unexpected deviation occurs in the positions of the liquid drops. Of course, it is not necessary for any one product embodying the invention to achieve all of the technical effects described above at the same time. Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. FIG. 1 is a schematic diagram of a droplet position detecting device according to an embodiment of the present invention; FIG. 2 is a schematic diagram of another droplet positio