CN215954803U - Illumination induced current detection circuit of liquid crystal writing device and liquid crystal writing device - Google Patents
Illumination induced current detection circuit of liquid crystal writing device and liquid crystal writing device Download PDFInfo
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- CN215954803U CN215954803U CN202122055910.8U CN202122055910U CN215954803U CN 215954803 U CN215954803 U CN 215954803U CN 202122055910 U CN202122055910 U CN 202122055910U CN 215954803 U CN215954803 U CN 215954803U
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Abstract
The utility model provides a liquid crystal writing device illumination induced current detection circuit and a liquid crystal writing device, wherein the detection circuit comprises: the liquid crystal writing device comprises a processor, a first power supply and a pull-up resistor, wherein the first power supply is connected with a first end of the pull-up resistor, a second end of the pull-up resistor is connected with a sampling port of the processor, and the second end of the pull-up resistor is used for being connected with a TFT source electrode of the liquid crystal writing device; the utility model realizes the rapid detection of the TFT illumination induced current of the liquid crystal writing device, thereby effectively applying the detected illumination induced current to avoid the influence of ambient light on writing and/or erasing.
Description
Technical Field
The utility model relates to the technical field of liquid crystal writing, in particular to a circuit for detecting illumination induced current of a liquid crystal writing device and the liquid crystal writing device.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The utility model patent of patent number CN112684618B discloses a technical scheme for realizing local erasing of a liquid crystal writing device by illumination, which comprises a conductive layer, a bistable liquid crystal layer and a substrate layer sequentially arranged from top to bottom; a plurality of pixel units are arranged on the basal layer in an array mode, and each pixel unit is internally provided with a pixel electrode and a thin film field effect transistor TFT (TFT for short) connected with the pixel electrode; applying a set control voltage to the gate electrode of the TFT and applying a set input voltage to the source electrode of the TFT so that the TFT is in a critical state; applying a set voltage to the conductive layer; at this time, an erasing device (hereinafter referred to as an optical erasing member) applies light within a set intensity range to an area to be erased, so that the TFT in the area receiving the light is turned on, a set voltage is input to the corresponding pixel electrode, and when the voltage between the pixel electrode and the conductive layer reaches an erasing voltage of the liquid crystal, partial erasing can be performed.
At present, the bistable liquid crystal writing device cannot detect illumination induced current, so that the discharge frequency of the liquid crystal writing device cannot be controlled according to the change of the illumination induced current, the illumination intensity control of an effective light erasing piece cannot be realized, and finally, the influence of environment light cannot be avoided by realizing more accurate control.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a circuit for detecting the illumination induced current of the liquid crystal writing device and the liquid crystal writing device, which realize the rapid detection of the illumination induced current of a TFT (thin film transistor) of the liquid crystal writing device, so that the detected illumination induced current can be effectively applied to avoid the influence of ambient light on writing and/or erasing.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a circuit for detecting light induced current of a liquid crystal writing device in a first aspect.
A circuit for detecting light induced current of a liquid crystal writing device comprises: the liquid crystal writing device comprises a processor, a first power supply and a pull-up resistor, wherein the first power supply is connected with the first end of the pull-up resistor, the second end of the pull-up resistor is connected with a sampling port of the processor, and the second end of the pull-up resistor is used for being connected with a TFT source electrode of the liquid crystal writing device.
The utility model provides a circuit for detecting the light induction current of the liquid crystal writing device in a second aspect.
A circuit for detecting light induced current of a liquid crystal writing device comprises: the device comprises a processor, a first power supply, a pull-up resistor, a first voltage-dividing resistor and a second voltage-dividing resistor;
the first power supply is connected with a first end of a pull-up resistor, a second end of the pull-up resistor is connected with a sampling port of the processor, and the second end of the pull-up resistor is used for being connected with a TFT source electrode of the liquid crystal writing device;
the first end of the first divider resistor is used for being connected with a source electrode of the liquid crystal writing device, and the second end of the first divider resistor is connected with the first end of the second divider resistor;
the second end of the second voltage-dividing resistor is grounded, and the communication port of the processor is connected with the connecting line between the first voltage-dividing resistor and the second voltage-dividing resistor.
Furthermore, the first end of the first voltage-dividing resistor is connected with the output end of the voltage follower, and the input end of the voltage follower is used for being connected with the source electrode of the liquid crystal writing device.
Further, a first analog switch and a second analog switch in communication with the processor;
the first analog switch comprises a first power supply port, a second power supply port and a ground port;
the input port of the second analog switch is connected with the first analog switch, and the output port of the second analog switch is connected with the first end of the first divider resistor.
The protection circuit at least comprises a seventh triode and an eighth triode, wherein a collector of the seventh triode is used for being connected with a source electrode of the TFT, and an emitter of the seventh triode is connected with a first end of the first divider resistor;
the base electrode of the seventh triode is connected with the collector electrode of the eighth triode through at least one twelfth resistor, the emitter electrode of the eighth triode is grounded, and the base electrode of the eighth triode is connected with a certain communication port of the processor through at least one thirteenth resistor.
The utility model provides a liquid crystal writing device, which comprises the light induction current detection circuit of the liquid crystal writing device.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model provides a current detection circuit under the condition of higher withstand voltage of a processor port, which can quickly realize the detection of the TFT illumination induced current of a liquid crystal writing device without arranging a corresponding protection circuit, and can effectively apply the detected illumination induced current when the withstand voltage of the processor port is higher so as to avoid the influence of ambient light on writing and/or erasing.
2. The utility model provides a current detection circuit under the condition of lower withstand voltage of a processor port, and the rapid detection of the illumination induced current is realized on the premise of avoiding the influence of the high voltage of a TFT source electrode of a liquid crystal writing device on the processor port by arranging a corresponding voltage division circuit or a corresponding protection circuit.
3. According to the utility model, the first drive circuit, the second drive circuit and the third drive circuit are arranged, so that the voltage control of the source electrode of the TFT of the bistable liquid crystal writing device is realized, the first voltage for conducting the TFT, the second voltage for discharging between the substrate layer and the conducting layer of the liquid crystal writing device and the grounding control can be provided for the source electrode of the TFT, and the conversion control of the voltage of the source electrode of the TFT is realized.
4. According to the liquid crystal writing device illumination induced current detection circuit and the liquid crystal writing device, the damage to the communication port of the processor when the TFT source electrode is connected with high voltage is effectively avoided by arranging the protection circuit.
5. According to the liquid crystal writing device illumination induced current detection circuit and the liquid crystal writing device, the integrated analog switch circuit module is directly adopted, the conversion control and the voltage protection control of the source voltage are realized, and the illumination induced current collection can be realized more efficiently.
Advantages of additional aspects of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
Fig. 1 is a first TFT connection diagram provided in embodiment 1 of the present invention.
Fig. 2 is a second schematic connection diagram of a TFT provided in embodiment 1 of the present invention.
Fig. 3 is a schematic diagram illustrating the connection of the whole TFT of the liquid crystal writing device according to embodiment 1 of the present invention.
Fig. 4 is a first schematic connection diagram of a light induced current detection circuit of a liquid crystal writing device according to embodiment 1 of the present invention.
Fig. 5 is a second connection schematic diagram of the light induced current detection circuit of the liquid crystal writing device according to embodiment 1 of the present invention.
Fig. 6 is a third schematic connection diagram of a light induced current detection circuit of a liquid crystal writing device according to embodiment 1 of the present invention.
Fig. 7 is a schematic diagram of a gate voltage control circuit according to embodiment 1 of the present invention.
Fig. 8 is a schematic diagram of processor connection provided in embodiment 1 of the present invention.
FIG. 9 shows a schematic view of a V according to example 1 of the present inventioncomVoltage control circuit schematic.
Detailed Description
The utility model is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1:
the embodiment 1 of the present invention provides a circuit for detecting light induced current of a liquid crystal writing device, where the liquid crystal writing device includes: the liquid crystal display panel comprises a conducting layer, a bistable liquid crystal layer and a substrate layer which are sequentially arranged from top to bottom, wherein the conducting layer can be not divided, a plurality of pixel units are integrated on the substrate layer, the pixel units are arranged in an array mode, a pixel electrode and a TFT connected with the pixel electrode are arranged in each pixel unit, and the TFT can provide voltage for the pixel electrode connected with the TFT in a conducting mode.
Specifically, as shown in fig. 1 and fig. 2, wiring diagrams of the TFT are respectively given. In fig. 2, the first plate represents a pixel electrode region to which the TFT is connected on the base layer; the second plate represents a conductive layer; the drain electrode of the TFT can be also connected with a storage capacitor, the leading-out electrode wire of each storage capacitor is connected with the leading-out electrode wire of the conducting layer, and the TFT is switched on to charge the storage capacitors. In fig. 1, the storage capacitor C functions to prevent voltage abrupt change, but it is also possible to realize the function of the storage capacitor C by using a distributed capacitance formed between the conductive layer and the underlying layer, and in this case, the storage capacitor C may be omitted, as shown in fig. 2.
Light induced current of the thin film field effect transistor TFT:
i ═ f (light-transmitting area of light-transmitting opening, channel material and process, storage capacitor C, light intensity),
it can be seen that the illumination induced current of the TFT is determined by the area of the light-transmitting opening, the channel material and process, the storage capacitor C, and the intensity of light received, and different channel materials and processes, the storage capacitor C, the area of the light-transmitting opening, and the intensity of light received all cause the variation of the illumination induced current of the TFT.
Therefore, through the high-precision detection of the illumination induced current, more precise control over the liquid crystal writing device can be achieved to avoid the influence of ambient light and different manufacturing processes on writing experience.
In this embodiment, a plurality of TFTs of a specific liquid crystal writing device are connected as shown in fig. 3, a plurality of TFTs connected in parallel are integrated on a base layer, and sources of the TFTs are connected together, and light induced currents flowing through the TFTs are obtained by detecting source voltages of the TFTs.
When the port voltage-withstanding capability of the processor is strong (namely, the voltage of the source is always less than the voltage acceptable by the sampling port of the processor), the detection circuit comprises: the device comprises a processor, a first power supply and a pull-up resistor, wherein the first power supply is connected with a first end of the pull-up resistor, a second end of the pull-up resistor is connected with a sampling port of the processor, the second end of the pull-up resistor is used for being connected with a TFT source electrode of the liquid crystal writing device, and the light induced current flowing through the TFT is obtained through the value of the first power supply V, the resistance value of the pull-up resistor R14 and the electric potential of the second end of the pull-up resistor detected by the processor.
When the port voltage-withstanding capability of the processor is weak (namely, the voltage of the source electrode is larger than the voltage accepted by the sampling port of the processor), the detection circuit comprises: the liquid crystal writing device comprises a processor, a first power supply V, a pull-up resistor R14, a first voltage-dividing resistor R15 and a second voltage-dividing resistor R16, wherein the first power supply V is connected with a first end of the pull-up resistor R14, a second end of the pull-up resistor R14 is connected with a sampling port of the processor, and a second end of the pull-up resistor R14 is used for being connected with a TFT source electrode of the liquid crystal writing device;
the first end of the first voltage-dividing resistor R15 is used for being connected with a source electrode of the liquid crystal writing device, the second end of the first voltage-dividing resistor R15 is connected with the first end of the second voltage-dividing resistor R16, the second end of the second voltage-dividing resistor R16 is grounded, and a communication port of the processor is connected with a connecting line between the first voltage-dividing resistor R15 and the second voltage-dividing resistor R16.
In this embodiment, the resistors may be separate resistor modules; or a resistance set formed by connecting a plurality of sub-resistors in series and parallel, and at this time, only the total resistance after series and parallel connection is considered in this embodiment, which is not described herein again.
It is understood that in some other embodiments, in order to better eliminate the shunting effect caused by the respective voltage resistors, the TFT source of the liquid crystal writing device may be connected to the first terminal of the first voltage-dividing resistor R15 through a voltage follower.
It will be appreciated that in other embodiments, a first driver circuit, a second driver circuit, and a third driver circuit in communication with the processor are also included;
the first driving circuit is used for providing a first voltage for a TFT source electrode of the liquid crystal writing device, the second driving circuit is used for providing a second voltage for the TFT source electrode of the liquid crystal writing device, and the third driving circuit is used for grounding the TFT source electrode of the liquid crystal writing device.
The first driving circuit at least comprises a first triode Q1 and a second triode Q2, a P1 communication port of the processor is connected with the base electrode of the first triode Q1 through at least one first resistor R1, the base electrode of the first triode Q1 is grounded through at least one second resistor R2, and the emitter electrode of the first triode Q1 is grounded;
the collector of the first triode Q1 is connected with the base of the second triode Q2 through at least one third resistor R3, the base of the second triode Q2 is connected with the emitter of the second triode Q2 through at least one fourth resistor R4, and the emitter of the second triode Q2 is connected with the second power supply VSONThe collector of the second transistor Q2 is connected to the source of the TFT through at least one fifth resistor R5.
The second driving circuit at least comprises a third triode Q3, a fourth triode Q4 and a fifth triode Q5, a P2 communication port of the processor is connected with the base electrode of a third triode Q3 through at least one sixth resistor R6, the base electrode of the third triode Q3 is grounded through at least one seventh resistor R7, and the emitter electrode of the third triode Q3 is grounded;
the collector of the third triode Q3 is connected with the cathode of the first diode D1 and the cathode of the second diode D2 through at least one eighth resistor R8, the anode of the first diode D1 is connected with the base of the fourth triode Q4, the collector of the fourth triode Q4 is connected with the source of the TFT through the third diode D3, and the collector of the fourth triode Q4 is connected with the third power supply VMThe collector of the fourth triode Q4 is grounded through a ninth resistor R9;
the collector of the fourth triode Q4 is connected with the cathode of the fourth diode D4, the anode of the fourth diode D4 is connected with the collector of the fifth triode Q5, the base of the fifth triode Q5 is connected with the anode of the second diode D2, and the emitter of the fifth triode Q5 is connected with the TFT source.
The third driving circuit comprises at least a sixth transistor Q6, the P3 communication port of the processor is connected with the base of the sixth transistor Q6 through at least one tenth resistor R10, the collector of the sixth transistor Q6 is used for being connected with the source of the TFT, and the emitter of the sixth transistor Q6 is grounded.
The protection circuit at least comprises a seventh triode Q7 and an eighth triode Q8, wherein the collector of the seventh triode Q7 is used for being connected with the source of the TFT, the emitter of the seventh triode Q8 is used for being connected with the first end of a first voltage-dividing resistor R15, and the emitter of the seventh triode Q7 is connected with the base of the seventh triode Q7 through at least one eleventh resistor R11;
the base of the seventh transistor Q7 is connected to the collector of the eighth transistor Q8 through at least one twelfth resistor R12, the emitter of the eighth transistor Q8 is grounded, and the base of the eighth transistor Q8 is connected to a communication port of the processor through at least one thirteenth resistor R13.
It is to be understood that in other embodiments, as shown in fig. 5, the first analog switch is used to replace the first driving circuit, the second driving circuit and the third driving circuit, and the second analog switch is used to replace the protection circuit;
the first analog switch comprises a first port connected with the second power supply, a second port connected with the third power supply and a grounding port, an input port of the second analog switch is connected with an output port of the first analog switch and used for selecting the second power supply, the third power supply and grounding, and an output port of the second analog switch is connected with the voltage division circuit.
It will be appreciated that in other embodiments, the output port of the second analog switch is connected to the first terminal of the first divider resistor R15 through at least one voltage follower, as shown in fig. 6.
The specific first analog switch and the second analog switch both adopt the existing circuit modules, the first analog switch only needs to realize the switching of connection of each port, and the second analog switch only needs to realize the effective high-voltage protection of preventing of the processor port, so that the technical personnel in the field can select according to specific working conditions, and the details are not repeated here.
It can be understood that the control of the TFT source voltage may adopt any other circuit structure that can be implemented, as long as the switching between the first voltage, the second voltage, and the ground can be implemented, and the protection circuit only needs to be able to implement the protection of the processor port, and those skilled in the art may design or select the circuit according to specific operating conditions, and details are not described here.
It will be appreciated that in other embodiments, the TFT gate voltage control circuit is shown in fig. 7, the specific processor circuit diagram is shown in fig. 8, and the specific V is showncomThe voltage control circuit is shown in fig. 9.
Example 2:
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A liquid crystal writing device illumination induced current detection circuit is characterized in that:
the method comprises the following steps: the liquid crystal writing device comprises a processor, a first power supply and a pull-up resistor, wherein the first power supply is connected with the first end of the pull-up resistor, the second end of the pull-up resistor is connected with a sampling port of the processor, and the second end of the pull-up resistor is used for being connected with a TFT source electrode of the liquid crystal writing device.
2. A liquid crystal writing device illumination induced current detection circuit is characterized in that:
the method comprises the following steps: the device comprises a processor, a first power supply, a pull-up resistor, a first voltage-dividing resistor and a second voltage-dividing resistor;
the first power supply is connected with a first end of a pull-up resistor, a second end of the pull-up resistor is connected with a sampling port of the processor, and the second end of the pull-up resistor is used for being connected with a TFT source electrode of the liquid crystal writing device;
the first end of the first divider resistor is used for being connected with a source electrode of the liquid crystal writing device, and the second end of the first divider resistor is connected with the first end of the second divider resistor;
the second end of the second voltage-dividing resistor is grounded, and the communication port of the processor is connected with the connecting line between the first voltage-dividing resistor and the second voltage-dividing resistor.
3. The liquid crystal writing apparatus photo-induced current detection circuit according to claim 2, characterized in that:
the first end of the first voltage dividing resistor is connected with the output end of the voltage follower, and the input end of the voltage follower is used for being connected with the source electrode of the liquid crystal writing device.
4. The liquid crystal writing apparatus photo-induced current detection circuit according to claim 2 or 3, characterized in that:
further comprising a first analog switch and a second analog switch in communication with the processor;
the first analog switch comprises a first power supply port, a second power supply port and a ground port;
the input port of the second analog switch is connected with the first analog switch, and the output port of the second analog switch is connected with the first end of the first divider resistor.
5. The liquid crystal writing apparatus photo-induced current detection circuit according to claim 2 or 3, characterized in that:
the protection circuit at least comprises a seventh triode and an eighth triode, wherein a collector of the seventh triode is used for being connected with a source electrode of the TFT, and an emitter of the seventh triode is connected with the first end of the first divider resistor;
the base electrode of the seventh triode is connected with the collector electrode of the eighth triode through at least one twelfth resistor, the emitter electrode of the eighth triode is grounded, and the base electrode of the eighth triode is connected with a certain communication port of the processor through at least one thirteenth resistor.
6. A photo-induced current detection circuit for a liquid crystal writing apparatus according to any one of claims 1 to 3, characterized in that:
the system also comprises a first driving circuit, a second driving circuit and a third driving circuit which are respectively communicated with the processor;
the first driving circuit is used for supplying a first voltage to a TFT source electrode of the liquid crystal writing device, the second driving circuit is used for supplying a second voltage to the TFT source electrode of the liquid crystal writing device, and the third driving circuit is used for grounding the TFT source electrode of the liquid crystal writing device.
7. The liquid crystal writing apparatus photo-induced current detection circuit according to claim 6, characterized in that:
the first driving circuit at least comprises a first triode and a second triode, a certain communication port of the processor is connected with the base electrode of the first triode through at least one first resistor, the base electrode of the first triode is grounded through at least one second resistor, and the emitting electrode of the first triode is grounded;
the collector electrode of the first triode is connected with the base electrode of the second triode through at least one third resistor, the base electrode of the second triode is connected with the emitting electrode of the second triode through at least one fourth resistor, the emitting electrode of the second triode is connected with the second power supply, and the collector electrode of the second triode is connected with the source electrode of the TFT through at least one fifth resistor.
8. The liquid crystal writing apparatus photo-induced current detection circuit according to claim 6, characterized in that:
the second driving circuit at least comprises a third triode, a fourth triode and a fifth triode, a certain communication port of the processor is connected with the base electrode of the third triode through at least one sixth resistor, the base electrode of the third triode is grounded through at least one seventh resistor, and the emitting electrode of the third triode is grounded;
the collector of the third triode is respectively connected with the cathode end of the first diode and the cathode end of the second diode through at least one eighth resistor, the anode end of the first diode is connected with the base of the fourth triode, the collector of the fourth triode is used for being connected with the source electrode of the TFT through the third diode, the collector of the fourth triode is respectively connected with the third power supply, and the collector of the fourth triode is grounded through a ninth resistor;
the collector of the fourth triode is connected with the cathode of the fourth diode, the anode of the fourth diode is connected with the collector of the fifth triode, the base of the fifth triode is connected with the anode of the second diode, and the emitter of the fifth triode is used for being connected with the TFT source.
9. The liquid crystal writing apparatus photo-induced current detection circuit according to claim 6, characterized in that: the third driving circuit at least comprises a sixth triode, a certain communication port of the processor is connected with the base electrode of the sixth triode through at least one tenth resistor, the collector electrode of the sixth triode is used for being connected with the source electrode of the TFT, and the emitter electrode of the sixth triode is grounded.
10. A liquid crystal writing apparatus characterized by: a photo-induced current detection circuit comprising the liquid crystal writing apparatus according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114822436A (en) * | 2022-04-13 | 2022-07-29 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing device with photoelectric detection function and method |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114822436A (en) * | 2022-04-13 | 2022-07-29 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing device with photoelectric detection function and method |
| CN114822436B (en) * | 2022-04-13 | 2023-12-08 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing device with photoelectric detection function and method |
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