CN110890072A - Self-powered electronic paper drive circuit and electronic paper display equipment - Google Patents
Self-powered electronic paper drive circuit and electronic paper display equipment Download PDFInfo
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- CN110890072A CN110890072A CN201911227335.6A CN201911227335A CN110890072A CN 110890072 A CN110890072 A CN 110890072A CN 201911227335 A CN201911227335 A CN 201911227335A CN 110890072 A CN110890072 A CN 110890072A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
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Abstract
The application discloses a self-powered electronic paper driving circuit and electronic paper display equipment, and relates to the technical field of electronic paper display, wherein the self-powered electronic paper driving circuit is respectively connected with a first input end of a rectifying module and a first end of a selective driving module by utilizing a first output end of a friction electrification module, and a second output end of the self-powered electronic paper driving circuit is respectively connected with a second input end of the rectifying module and a second end of the selective driving module; the first output end of the rectifying module is connected with the third end of the selective driving module, and the second output end of the rectifying module is connected with the fourth end of the selective driving module; the fifth end of the selection driving module is used for being connected with a first electrode of the electronic paper display module, and the sixth end of the selection driving module is used for being connected with a second electrode of the electronic paper display module. According to the technical scheme, different modules are connected through selecting the driving module at different stages of the alternating current output by the friction electrification module, so that the alternating current is applied to activate electrophoretic particles before the electronic paper display module is driven to display a picture, and the display precision of the electronic paper during working is improved.
Description
Technical Field
The invention relates to the technical field of electronic paper display, in particular to a self-powered electronic paper driving circuit and electronic paper display equipment.
Background
The electronic paper display device is a novel display device, and has the advantages of high color contrast, high resolution, low power consumption and low manufacturing cost. The electronic paper display device has advantages of lightness, thinness, durability, low energy consumption meeting the requirements of energy conservation and environmental protection, and the like, and is widely applied to electronic book readers, electronic tags, electronic billboards and the like.
With the increasing maturity of friction power generation technology, it is increasingly possible to use friction generators to supply power to electronic paper display devices. Compared with the traditional power supply mode of the electronic paper display device by an external power supply, the friction generator supplies power to the electronic paper display device, and the electronic paper display device is supplied with power by electric energy generated by the friction generator according to the friction principle directly, so that the electronic paper display device does not need to consume external electric energy, better energy-saving and environment-friendly effects are achieved, and the friction electrification self-powered electronic paper display device has higher industrial and commercial values.
However, in the process of implementing the present invention, the inventors found that the prior art at least includes the following defects: when the friction electrification generator drives the electronic paper display device, when an electronic paper picture is not refreshed for a period of time, the activity of internal particles of the electronic paper is reduced, so that the electronic paper is difficult to accurately display a certain gray scale in the display process, the electronic paper is driven according to the conventional mode of directly applying display waveforms, and the display effect with higher precision is difficult to realize.
Disclosure of Invention
The invention provides a self-powered electronic paper driving circuit and electronic paper display equipment, which are used for activating electrophoretic particles before driving the electrophoretic particles to display, so that the electronic paper can quickly and accurately display a certain gray scale in the display process, and a display effect with higher precision is achieved.
In a first aspect, an embodiment of the present invention provides a self-powered electronic paper driving circuit, including: the device comprises a friction electrification module, a selection driving module and a rectification module;
the first output end of the friction electrification module is respectively connected with the first input end of the rectification module and the first end of the selective driving module, and the second output end of the friction electrification module is respectively connected with the second input end of the rectification module and the second end of the selective driving module; the friction electrification module is used for providing electric energy;
the first output end of the rectifying module is connected with the third end of the selective driving module, and the second output end of the rectifying module is connected with the fourth end of the selective driving module; the rectifying module is used for rectifying the electric energy output by the friction electrification module;
the fifth end of the selective driving module is used for being connected with a first electrode of the electronic paper display module, and the sixth end of the selective driving module is used for being connected with a second electrode of the electronic paper display module; the selective driving module is used for selectively switching on the rectifying module.
Further, the selective driving module comprises a charging unit, a control unit, a first switch unit and a second switch unit;
the first end of the charging unit is connected with the first output end of the rectifying module, and the second end of the charging unit is connected with the second output end of the rectifying module;
the signal input end of the control unit is connected with the first end of the charging unit and used for outputting a switch control signal according to the voltage values at the two ends of the charging unit so as to control the switching action of the switching tubes in the first switching unit and the second switching unit;
the first common end of the first switch unit is used for being connected with a first electrode of the electronic paper display module, the first normally closed end is connected with the first output end of the friction electrification module, and the first normally open end is connected with the first output end of the rectification module;
the second common end of the second switch unit is used for being connected with a second electrode of the electronic paper display module, the second normally closed end is connected with the second output end of the friction electrification module, and the second normally open end is connected with the second output end of the rectification module.
Further, the charging unit and the control unit are configured to:
when the voltage quantity at the two ends of the charging unit does not reach the reference voltage, the voltage input by the signal input end of the control unit is smaller than the threshold voltage of the control unit, and the control unit outputs a first switch control signal;
when the voltage value at two ends of the charging unit reaches the reference voltage, the voltage input by the signal input end of the control unit is greater than or equal to the threshold voltage of the control unit, and the control unit outputs a second switch control signal; wherein the reference voltage is equal to or less than the threshold voltage.
Further, when the control unit outputs a first switch control signal, the first switch unit switches on a first output end of the friction electrification module and a first electrode of the electronic paper display module, and the second switch unit switches on a second output end of the friction electrification module and a second electrode of the electronic paper display module;
when the control unit outputs a second switch control signal, the first switch unit is connected with the first output end of the rectifying module and the first electrode of the electronic paper display module, and the second switch unit is connected with the second output end of the rectifying module and the second electrode of the electronic paper display module.
Further, the charging unit includes a capacitance unit.
In one embodiment, the selection driving module further includes: the resistance unit is used for current-limiting protection;
the first end of the resistance unit is connected with the first output end of the rectifying module, and the second end of the resistance unit is connected with the first end of the charging unit.
In one embodiment, the control unit includes a logic device having a two-state output.
Further, the logic device with two-state output is one or more of a buffer, a comparator, an inverter and an amplifier.
Further, the first switch unit and the second switch unit each include a multi-way selection switch unit.
In a second aspect, an electronic paper display device is characterized by comprising the electronic paper driving circuit as described in the first aspect.
The self-powered electronic paper driving circuit and the electronic paper display device provided by the embodiment have at least the following beneficial effects:
the electronic paper driving circuit comprises a friction electrification module, a selection driving module and a rectification module, wherein the friction electrification module outputs alternating current in different stages, the rectification module is selectively switched on through the selection driving module, before the electronic paper display module is driven to display images, the rectification module is not switched on, the alternating current is directly applied through the friction electrification module to activate electrophoresis particles, then the rectification module is switched on, the alternating current output by the friction electrification module outputs direct current after rectification of the rectification module to drive the electrophoresis particles to move to display images, and therefore the display precision of the electronic paper during working is improved.
Furthermore, the selective driving module comprises a charging unit, a control unit, a first switch unit and a second switch unit, wherein in the process of charging the charging unit, the control unit outputs different switch control signals according to the charging electric quantity of the charging unit so as to control the first switch unit and the second switch unit to be connected with different circuits, so that before the electronic paper display module is driven to display a picture, alternating current which is not processed by the rectifying module is applied to activate electrophoretic particles in the electronic paper display module, and during picture display, direct current which is rectified and output by the rectifying module drives the electronic paper display module to display, so that the display precision of the electronic paper during working is improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a driving waveform for displaying an electronic paper;
FIG. 2 is a first schematic diagram of an electronic paper driving circuit according to an embodiment;
FIG. 3 is a second schematic diagram of an electronic paper driving circuit according to an embodiment;
fig. 4 is a third schematic diagram of an electronic paper driving circuit according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. The terms "first end", "second end", "third end", "one end", "the other end" and the like are used herein for illustrative purposes only.
The term "comprises" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a product or device comprising a list of modules or elements is not limited to the listed modules or elements but may alternatively include additional modules or elements not listed or additional modules or elements inherent to such units, modules, products or devices.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
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 terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Fig. 1 is a schematic diagram of a display driving waveform of an electronic paper according to an embodiment, and as shown in fig. 1, in order to achieve better display effect of the electronic paper, an ac voltage for activation may be applied before a dc voltage for display is applied. Therefore, the embodiment of the invention provides an electronic paper driving circuit, which outputs an ac voltage to activate electrophoretic particles in electronic paper at an initial stage of applying a driving voltage, and then outputs a dc voltage to drive the electrophoretic particles to corresponding gray scales for display.
Fig. 2 is a first schematic diagram of an electronic paper driving circuit according to an embodiment, and as shown in fig. 2, the electronic paper driving circuit includes: a triboelectric charging module 110, a selective drive module 120, and a rectification module 130.
A first output end of the triboelectric charging module 110 is respectively connected to a first input end of the rectifying module 130 and a first end of the selective driving module 120, and a second output end of the triboelectric charging module 110 is respectively connected to a second input end of the rectifying module 130 and a second end of the selective driving module 120; the friction electrification module is used for providing electric energy; a first output end of the rectifying module 130 is connected to the third end of the selective driving module 120, and a second output end of the rectifying module 130 is connected to the fourth end of the selective driving module 120; the rectifying module is used for rectifying the electric energy output by the friction electrification module; the fifth terminal of the selective driving module 120 is configured to be connected to the first electrode of the e-paper display module 140, the sixth terminal is configured to be connected to the second electrode of the e-paper display module 140, and the selective driving module is configured to selectively switch on the rectifying module, so as to selectively drive the e-paper display module 140 respectively in a mode of connecting the rectifying module or not connecting the rectifying module.
The electronic paper driving circuit provided by the embodiment does not need to be connected with an external power supply, and the electric energy required by the operation of the electronic paper driving circuit is provided by the frictional electrification module 110. The frictional electrification module 110 is a module that generates electric charges based on the principle of frictional electrification, and the frictional electrification module 110 may include a frictional electrification device and its necessary electric circuit. The electric energy output by the friction electrification module 110 is alternating current, and the electronic paper display module 140 displays the electric energy under the driving of direct current. The rectifying module 130 is used for converting the ac power output by the frictional electrification module 110 into dc power to drive the electronic paper display module 140 for displaying, and in an embodiment, the rectifying module 130 includes a rectifier and its necessary connection circuit. The selection driving module 120 is configured to receive the charges generated by the frictional electrification module 110, and switch on the rectification module 130 according to the amount of the generated charges, so that an alternating current is input to activate electrophoretic particles in the electronic paper display module 140 at an initial stage of driving the electronic paper display module to perform display, and a direct current is input to drive the electronic paper display module 140 to perform display at a subsequent stage.
Referring to fig. 1, the frictional electrification module 110 is connected to the rectification module 130 and the selection driving module 120, respectively, the selection driving module 120 is connected to the electronic paper display module 140, wherein the selective driving module 120 includes a selective switching circuit to turn on different circuits at an initial stage and a subsequent stage of the output of the ac power of the frictional electrification module 140, so that, in the initial stage of applying the driving voltage, the frictional electrification module 110 outputs the alternating current directly to the electronic paper display module 140 through the selective driving module 120 without being rectified by the rectification module 130, outputs the alternating current to activate the electrophoretic particles in the electronic paper display module 140, in the subsequent stage of applying the driving voltage, the ac output by the frictional electrification module 110 is converted into dc by the rectification function of the rectification module 130 and then output to the electronic paper display module 140, and the dc is output to drive the electronic paper display module 140 to display.
The self-powered electronic paper driving circuit provided by the embodiment comprises a friction electrification module, a selection driving module and a rectification module, wherein different stages of alternating current output by the friction electrification module are connected with different modules through the selection driving module, and the purpose of applying the alternating current to activate electrophoretic particles before driving an electronic paper display module to display pictures is achieved, so that the electronic paper can quickly and accurately display a certain gray scale in the display process, and the display precision of the electronic paper during working is improved.
Further, as shown in fig. 3, fig. 3 is a schematic diagram of a second principle of an electronic paper driving circuit according to an embodiment, where the selection driving module 120 includes a charging unit 121, a control unit 122, a first switching unit 123, and a second switching unit 124.
The first output end of the triboelectric charging module 110 is connected to the first input end of the rectifying module 130, and the second output end is connected to the second input end of the rectifying module 130; a first end of the charging unit 121 is connected to a first output end of the rectifying module 130, and a second end of the charging unit 121 is connected to a second output end of the rectifying module 130; a signal input end of the control unit 122 is connected to a first end of the charging unit 121, and is configured to output a switching control signal according to a voltage value at two ends of the charging unit 121 to control switching operations of switching tubes in the first switching unit 123 and the second switching unit 124; the first common end of the first switch unit 123 is used for connecting a first electrode of the electronic paper display module 140, the first normally closed end is connected to the first output end of the frictional electrification module 110, and the first normally open end is connected to the first output end of the rectification module 130; the second common terminal of the second switch unit 124 is used for connecting the second electrode of the electronic paper display module 140, the second normally closed terminal is connected to the second output terminal of the frictional electrification module 110, and the second normally open terminal is connected to the second output terminal of the rectification module 130.
In an embodiment, the first output terminal and the second output terminal of the triboelectric charging module 110 output charges with opposite polarities, such as positive charge/voltage output from the first output terminal and negative charge/voltage output from the second output terminal, or negative charge/voltage output from the first output terminal and positive charge/voltage output from the second output terminal. The positive and negative charges/voltages output from the frictional electrification module 110 are output to both ends of the charging unit 121 through the rectification module 130 to charge the charging unit 121. During the charging process, the voltage amount across the charging unit 121 changes as the amount of charged electricity increases.
The voltage value input to the signal input terminal of the control unit 122 is equal to the amount of the voltage across the charging unit 121 at present. The control unit 122 outputs different switch control signals according to the magnitude of the voltage value input by the signal input terminal. In an embodiment, the control unit 122 includes a chip having a control function and a circuit thereof, and the control unit has different threshold voltages according to a type of the control unit. The control unit 122 outputs different switch control signals according to the comparison result between the voltage value input by the signal input terminal and the threshold voltage, for example, outputs a first switch control signal, such as a high level signal, when the input voltage value is not less than the threshold voltage, and outputs a second switch control signal, such as a low level signal, when the input voltage value is less than the threshold voltage.
The first switching unit 123 and the second switching unit 124 are the same switching unit. In an embodiment, the first switch unit 123 and the second switch unit 124 are both multi-channel analog switches, and further, may be single-pole double-throw analog switches. The first and second switching units 123 and 124 turn on different circuits according to the received switching control signal, so as to determine whether the alternating current output from the frictional electrification module 110 flows through the rectification module 130.
It should be noted that, as shown in fig. 4, fig. 4 is a third schematic diagram of an electronic paper driving circuit according to an embodiment, there may be two charging units 121 and two control units 122, which are respectively connected to the first switch unit 123 and the second switch unit 124. If the charging unit 121 includes a first charging unit and a second charging unit, and the control unit 122 includes a first control unit and a second control unit, specifically, the connection relationship is:
the first end of the first charging unit is connected with the first output end of the rectifying module, and the second end of the first charging unit is connected with the second output end of the rectifying module; the signal input end of the first control unit is connected with the first end of the first charging unit and used for outputting a switch control signal according to the voltage values at the two ends of the first charging unit so as to control the switching action of a switching tube in the first switching unit; the first common end of the first switch unit is used for being connected with a first electrode of the electronic paper display module, the first normally closed end is connected with a first output end of the friction electrification module, and the first normally open end is connected with a first output end of the rectification module;
the first end of the second charging unit is connected with the first output end of the rectifying module, and the second end of the second charging unit is connected with the second output end of the rectifying module; the signal input end of the second control unit is connected with the first end of the second charging unit and used for outputting a switch control signal according to the voltage quantity at the two ends of the second charging unit so as to control the switching action of a switching tube in the second switching unit; the second common end of the second switch unit is used for being connected with a second electrode of the electronic paper display module, the second normally closed end is connected with the second output end of the friction electrification module, and the second normally open end is connected with the second output end of the rectification module.
The work flow of the electronic paper driving circuit provided by the embodiment may be as follows: the alternating current output by the friction electrification module 110 is converted into direct current after being processed by the rectification module 130, and supplies power to the selective driving module 120, and meanwhile, the charging unit 121 outputs the output direct current to charge the charging unit 121. In the charging process, the amount of electricity of the charging unit 121 is small, the voltage value at the two ends of the charging unit 121 is low, the voltage value input by the signal input end of the control unit 122 is low and does not reach the threshold voltage of the control unit 122, the control unit 122 outputs a first switch control signal, such as a low level signal, and at this time, the first switch unit 123 and the second switch unit 124 are in the normally closed mode. The normally closed mode is an operation mode in which the common terminal and the normally closed terminal are closed and turned on in a certain switch unit, that is, in this embodiment, the circuit between the first common terminal and the first normally closed terminal in the first switch unit 123 is turned on, and the circuit between the second common terminal and the second normally closed terminal in the second switch unit 124 is turned on, at this time, the friction electrification module 110 is directly connected to the electronic paper display module 140 and outputs an alternating current to the electronic paper display module 140, and the electrophoretic example in the electronic paper display module slightly moves under the alternating current to activate the particles.
In the process that the tribocharging module 110 continuously charges the charging unit 121 through the rectifying module 130, the amount of charge accumulated by the charging unit increases, the voltage value at both ends increases, the voltage value input by the signal input end of the control unit 122 increases, and reaches the threshold voltage of the control unit 122, the control unit 122 outputs a second switch control signal, such as a high level signal, and at this time, the first switch unit 123 and the second switch unit 124 are in a normally open mode. The normally open mode is an operation mode in which the common terminal and the normally open terminal are closed and are turned on in a certain switching unit, that is, in the present embodiment, the circuit between the first common terminal and the first normally open terminal in the first switching unit 123 is turned on, and the circuit between the second common terminal and the second normally open terminal in the second switching unit 124 is turned on. At this time, the frictional electrification module 110 is connected to the electronic paper display module 140 through the rectification module 130. The alternating current output by the friction charging module 110 is converted into direct current after being rectified by the rectifying module 130 and then output to the electronic paper display module 140, so that the electrophoretic example in the electronic paper display module 140 performs directional motion under the action of the direct current to display.
The self-powered electronic paper driving circuit provided by the embodiment comprises a friction electrification module, a selection driving module and a rectification module, wherein the selection driving module comprises a charging unit, a control unit, a first switch unit and a second switch unit, in the charging process of the charging unit, according to the charging electric quantity of the charging unit, the control unit outputs different switch control signals to control different circuits to be connected with the first switch unit and the second switch unit, and the effect that before the electronic paper display module is driven to display images, alternating current is applied to activate electrophoretic particles so as to improve the display precision of the electronic paper during working is achieved.
In one embodiment, the charging unit 121 and the control unit 122 are configured to: when the voltage value at the two ends of the charging unit 121 does not reach the reference voltage, the voltage input by the signal input end of the control unit 122 is smaller than the threshold voltage of the control unit 122, and the control unit 122 outputs a first switch control signal; when the voltage value at the two ends of the charging unit 121 reaches the reference voltage, the voltage input at the signal input end of the control unit 122 is greater than or equal to the threshold voltage of the control unit 122, and the control unit 122 outputs a second switch control signal.
The reference voltage is a set voltage value. Generally, the reference voltage is determined according to the threshold voltage of the control unit 122, which is equal to or less than the threshold voltage of the control unit. In the present embodiment, the reference voltage is equal to the threshold voltage of the control unit 122. Alternatively, the reference voltage may be less than or equal to the voltage across the charging unit 121 when fully charged. In the embodiment, in order to more accurately set the reference voltage equal to the voltage value at both ends of the charging unit 121 when fully charged to control the control unit 122 to output different switching control signals.
When the battery is not fully charged and is in a charging process, the voltage across the charging unit 121 is small, and the voltage input by the signal input terminal of the control unit 122 is smaller than the threshold voltage of the control unit 122, the control unit 122 outputs a first switch control signal. When the battery is fully charged, the voltage across the charging unit 121 is large, the voltage input to the signal input terminal of the control unit 122 is greater than or equal to the threshold voltage of the control unit 122, and the control unit 122 outputs a second switching control signal. The voltage input by the signal input end of the control unit 122 is equal to the actual voltage at the two ends of the charging unit 121, the first switch control signal is used for controlling the first switch unit 123 and the second switch unit 124 to switch on the circuit between the friction charging module 110 and the electronic paper display module 140, and the second switch control signal is used for controlling the first switch unit 123 and the second switch unit 124 to switch on the circuit between the friction charging module 110 and the electronic paper display module 140.
In one embodiment, when the control unit 122 outputs a first switch control signal, the first switch unit 123 turns on a first output terminal of the friction electrification module 110 and a first electrode of the electronic paper display module 140, and the second switch unit 124 turns on a second output terminal of the friction electrification module 110 and a second electrode of the electronic paper display module 140; when the control unit 122 outputs the second switch control signal, the first switch unit 123 turns on the first output terminal of the rectifying module 130 and the first electrode of the electronic paper display module 140, and the second switch unit 124 turns on the second output terminal of the rectifying module 130 and the second electrode of the electronic paper display module 140.
The first switch control signal and the second switch control signal are opposite control signals, such as a high level signal and a low level signal. Illustratively, the first switch control signal is a low level signal, the control unit 122 outputs the low level signal to the first switch unit 123 and the second switch unit 124, and at this time, both the first switch unit 123 and the second switch unit 124 are in a normally closed mode, the first switch unit 123 turns on the first output terminal of the friction electrification module 110 and the first electrode of the electronic paper display module 140, and the second switch unit 124 turns on the second output terminal of the friction electrification module 110 and the second electrode of the electronic paper display module 140, so that the alternating current output by the friction electrification module 110 is transmitted to the electronic paper display module 140 through the first switch unit 123 and the second switch unit 124, and under the action of the alternating current, the electrophoretic particles in the electronic paper display module 140 vibrate and are in an activated state. The second switch control signal is a high level signal, the control unit 122 outputs the high level signal to the first switch unit 123 and the second switch unit 124, at this time, the first switch unit 123 and the second switch unit 124 are both in a normally open mode, the first switch unit 123 connects the first output end of the rectifying module 130 and the first electrode of the electronic paper display module 140, the second switch unit 124 connects the second output end of the rectifying module 130 and the second electrode of the electronic paper display module 140, at this time, the alternating current output by the friction electrification module 110 is converted into direct current through the rectifying module 130 and is output to the electronic paper display module 140, so as to drive the electronic paper to display. Because the alternating current is input to the electronic paper display module 140 to activate the electrophoretic particles before the electronic paper is driven to display, higher display accuracy can be achieved when the direct current processed by the rectifying module 130 is input to the electronic paper display module 140 to drive the electronic paper to work.
In one embodiment, the charging unit 121 includes a capacitor unit.
The charging unit 121 includes an electronic component having a charge storage function, such as a capacitor unit or the like. The larger the capacitance value of the capacitor unit is, the more the amount of charge it can store, and the larger the voltage value across the capacitor unit when it is fully charged. In an embodiment, the capacitance value of the capacitance unit is determined according to a threshold voltage of the control unit. Illustratively, the voltage across the capacitive unit should be greater than or equal to the threshold voltage of the control unit when fully charged.
In one embodiment, referring to fig. 3 or 4, the selection driving module 120 in the electronic paper driving circuit further includes: a resistance unit 125 for current limiting protection; a first end of the resistor unit 125 is connected to the first output end of the rectifying module 130, and a second end of the resistor unit 125 is connected to the first end of the charging unit 121.
Further, the control unit includes an element having at least two state outputs.
The two-state output refers to a high-level output and a low-level output, and the control unit comprises an element with at least two-state output, so that the control unit has at least two-state output when different input voltages are applied to control the first switch unit and the second switch unit to switch on different circuits. Of course, it may be a tri-state or more than tri-state output element. In this embodiment, since two different circuits can be selectively turned on by the first switch unit and the second switch unit, the control unit 122 includes an element with tri-state or more than tri-state output to select two-state output connected to the first switch unit and the second switch unit respectively.
Further, the element having at least two-state output may be a two-state output logic device, such as a comparator, an inverter, an amplifier, etc., or may be a three-state output logic device, such as a buffer, etc. Specifically, the comparator outputs a binary signal 0 or 1 according to the comparison result between the input voltage and the comparator threshold voltage, such as outputting a logic 1 when the input voltage is greater than or equal to the comparator threshold voltage, and outputting a logic 0 when the input voltage is less than the comparator threshold voltage, where "1" represents a high level output and "0" represents a low level output. Similarly, the comparator is an operational amplifier without feedback (positive feedback, negative feedback), so that the comparator and the operational amplifier have a common point, the comparator can be realized by the operational amplifier, and the operational amplifier can also realize binary output. The inverter can invert the phase of the input signal by 180 degrees to realize high-level or low-level output and realize two-state output. The buffer is a Three-state buffer (also called a Three-state gate, a Three-state driver), and its Three-state output is controlled by the enable output terminal, when the enable output is active, the device implements normal logic state output, i.e. outputs logic 0 or logic 1, "1" can represent high level output, and "0" can represent low level output.
In one embodiment, the first switching unit and the second switching unit each include a multiplexing switching unit.
The multiplexer unit includes one or more multiplexers, also called multiplexers, such as single-pole double-throw switches, single-pole multi-throw switches, etc. The multi-path selection switch unit is connected with at least two paths of different circuits, and a certain path or a plurality of paths of circuits can be conducted according to requirements in the transmission process of multi-path data.
The embodiment of the invention also provides electronic paper display equipment which comprises the electronic paper driving circuit in any embodiment.
The electronic paper display device provided by the embodiment has the beneficial effects of the electronic paper display driving circuit mentioned in any embodiment.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A self-powered electronic paper drive circuit, comprising: the device comprises a friction electrification module, a selection driving module and a rectification module;
the first output end of the friction electrification module is respectively connected with the first input end of the rectification module and the first end of the selective driving module, and the second output end of the friction electrification module is respectively connected with the second input end of the rectification module and the second end of the selective driving module; the friction electrification module is used for providing electric energy;
the first output end of the rectifying module is connected with the third end of the selective driving module, and the second output end of the rectifying module is connected with the fourth end of the selective driving module; the rectifying module is used for rectifying the electric energy output by the friction electrification module;
the fifth end of the selective driving module is used for being connected with a first electrode of the electronic paper display module, and the sixth end of the selective driving module is used for being connected with a second electrode of the electronic paper display module; the selective driving module is used for selectively switching on the rectifying module.
2. The self-powered electronic paper drive circuit of claim 1, wherein the selection drive module comprises a charging unit, a control unit, a first switch unit, and a second switch unit;
the first end of the charging unit is connected with the first output end of the rectifying module, and the second end of the charging unit is connected with the second output end of the rectifying module;
the signal input end of the control unit is connected with the first end of the charging unit and used for outputting a switch control signal according to the voltage values at the two ends of the charging unit so as to control the switching action of the switching tubes in the first switching unit and the second switching unit;
the first common end of the first switch unit is used for being connected with a first electrode of the electronic paper display module, the first normally closed end is connected with the first output end of the friction electrification module, and the first normally open end is connected with the first output end of the rectification module;
the second common end of the second switch unit is used for being connected with a second electrode of the electronic paper display module, the second normally closed end is connected with the second output end of the friction electrification module, and the second normally open end is connected with the second output end of the rectification module.
3. The self-powered electronic paper drive circuit of claim 2, wherein the charging unit and the control unit are configured to:
when the voltage quantity at the two ends of the charging unit does not reach the reference voltage, the voltage input by the signal input end of the control unit is smaller than the threshold voltage of the control unit, and the control unit outputs a first switch control signal;
when the voltage value at the two ends of the charging unit reaches the reference voltage, the voltage input by the signal input end of the control unit is greater than or equal to the threshold voltage of the control unit, and the control unit outputs a second switch control signal; wherein the reference voltage is equal to or less than the threshold voltage.
4. The self-powered electronic paper driving circuit according to claim 3, wherein when the control unit outputs a first switching control signal, the first switching unit turns on a first output terminal of the triboelectric charging module and a first electrode of the electronic paper display module, and the second switching unit turns on a second output terminal of the triboelectric charging module and a second electrode of the electronic paper display module;
when the control unit outputs a second switch control signal, the first switch unit is connected with the first output end of the rectifying module and the first electrode of the electronic paper display module, and the second switch unit is connected with the second output end of the rectifying module and the second electrode of the electronic paper display module.
5. The self-powered electronic paper drive circuit of claim 2, wherein the charging unit comprises a capacitive unit.
6. The self-powered electronic paper drive circuit of claim 2, wherein the select drive module further comprises: the resistance unit is used for current-limiting protection;
the first end of the resistance unit is connected with the first output end of the rectifying module, and the second end of the resistance unit is connected with the first end of the charging unit.
7. The self-powered electronic paper drive circuit of claim 1, wherein the control unit comprises a logic device having a two-state output.
8. The self-powered electronic paper drive circuit of claim 7, wherein the logic device with a two-state output is one or more of a buffer, a comparator, an inverter, and an amplifier.
9. The self-powered electronic paper drive circuit of claim 1, wherein the first switch unit and the second switch unit each comprise a multi-way selector switch unit.
10. An electronic paper display device characterized by comprising the self-powered electronic paper drive circuit according to any one of claims 1 to 9.
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| CN201911227335.6A CN110890072A (en) | 2019-12-04 | 2019-12-04 | Self-powered electronic paper drive circuit and electronic paper display equipment |
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