CN114822408B - Electronic tag, driving method thereof and picture updating system of electronic tag - Google Patents
Electronic tag, driving method thereof and picture updating system of electronic tag Download PDFInfo
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- CN114822408B CN114822408B CN202210609063.1A CN202210609063A CN114822408B CN 114822408 B CN114822408 B CN 114822408B CN 202210609063 A CN202210609063 A CN 202210609063A CN 114822408 B CN114822408 B CN 114822408B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
- G09F9/335—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes being organic light emitting diodes [OLED]
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- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses an electronic tag, a driving method thereof and a picture updating system of the electronic tag. The electronic tag includes: a substrate; the array is arranged on the sub-pixel on the substrate, and the sub-pixel comprises: a switching module, a storage driving module, and a light emitting device; the storage driving module is connected between the light emitting device and the power line, and the switch module is connected between the data line and the storage driving module; the switch module is used for responding to the conduction of the scanning signal on the scanning line and transmitting the voltage on the data line to the storage driving module; the storage driving module is used for storing image display information according to the first voltage transmitted on the power line and the first data voltage transmitted by the data line, and outputting driving current according to the second voltage transmitted on the power line and the second data voltage transmitted by the data line so as to drive the light emitting device to emit light, wherein the driving current is related to the image display information. The embodiment of the invention can improve the display effect of the electronic tag on the basis of ensuring lower cost of the electronic tag.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to an electronic tag, a driving method thereof, and a picture update system for the electronic tag.
Background
In the prior art, the electronic tag is realized by a liquid crystal or electronic ink display technology, the cost of the electronic tag realized by the display technology is lower, however, a backlight source is required to be provided for realizing liquid crystal display, an ambient light source is required to be provided for electronic ink display, and the display color effect of the electronic tag prepared by the display technology is poor.
Disclosure of Invention
The invention provides an electronic tag, a driving method thereof and a picture updating system of the electronic tag, so as to improve the display effect of the electronic tag on the basis of ensuring lower cost of the electronic tag.
In order to achieve the technical purpose, the embodiment of the invention provides the following technical scheme:
an electronic tag, comprising:
a substrate;
an array of subpixels disposed on the substrate, the subpixels including: a switching module, a storage driving module, and a light emitting device;
the storage driving module is connected between the light emitting device and the first power line, and the switch module is connected between the data line and the storage driving module; the switch module is used for responding to the conduction of a scanning signal on a scanning line and transmitting the voltage on the data line to the storage driving module;
the storage driving module is used for storing image display information according to the first voltage transmitted by the first power line and the first data voltage transmitted by the data line, outputting driving current according to the second voltage transmitted by the first power line and the second data voltage transmitted by the data line so as to drive the light emitting device to emit light, and the driving current is related to the image display information.
Optionally, the storage driving module includes: the first transistor is a floating gate transistor; the grid electrode of the first transistor is electrically connected with the switch module; a first pole of the first transistor is electrically connected to the first power line; a second pole of the first transistor is electrically connected to the light emitting device.
Optionally, the first voltage and the first data voltage are used to change a threshold voltage of the first transistor, the threshold voltage characterizing the image display information.
Optionally, the first transistor includes a plurality of floating gates, and a gate insulating layer is disposed between adjacent floating gates;
the gate insulating layer includes a silicon nitride layer, a silicon oxide layer, or a stacked structure of silicon nitride and silicon oxide.
Optionally, the first voltage is greater than the second voltage;
the second data voltages transmitted by all the data lines are equal.
Optionally, the switch module includes: a second transistor; the gate of the second transistor is electrically connected with the scan line, the first electrode of the second transistor is electrically connected with the data line, and the second electrode of the second transistor is electrically connected with the memory driving module.
Correspondingly, the embodiment of the invention also provides a driving method of the electronic tag, which is used for driving the electronic tag provided by any embodiment of the invention; the driving method of the electronic tag comprises the following steps:
an information storage stage transmitting a first voltage to the first power line; transmitting a first scanning signal to the scanning line, and controlling the switch module connected with the scanning line to be conducted; when the switch module is conducted, the first data voltage is transmitted to the data line, so that each storage driving module stores image display information according to the first voltage and the first data voltage;
a display stage transmitting a second voltage to the first power line; transmitting a second scanning signal to the scanning line, and controlling the switch module to be conducted; and transmitting a second data voltage to the data line, so that each storage driving module outputs a driving current according to the second voltage and the second data voltage to drive the light emitting device to emit light, wherein the driving current is associated with the image display information;
preferably, the second scan signal is a direct current signal.
Correspondingly, the embodiment of the invention also provides a picture updating system of the electronic tag, which comprises the following steps: the driving device and the electronic tags provided by any embodiment of the invention;
the driving device includes:
the scanning driving module is used for providing scanning signals for the scanning lines of the electronic tag;
the power module is used for providing a first voltage for a first power line of the electronic tag;
and the data voltage supply module is used for supplying a first data voltage to the data line of the electronic tag.
Optionally, the driving device is detachably connected to the electronic tag.
Optionally, the method further comprises: a wireless communication module; the driving device transmits signals to the electronic tag through the scanning driving module, the power supply module and the data voltage providing module based on the wireless communication module.
In the embodiment of the invention, the electronic tag is arranged to be composed of a plurality of sub-pixels comprising the light-emitting device with the active light-emitting function, which is equivalent to applying the OLED display technology to the electronic tag, so that the display color of the electronic tag is rich and bright, and the display effect of the electronic tag is greatly improved. And the auxiliary of an external light source is not needed, so that the limitation on the use scene of the electronic tag is reduced. Meanwhile, in the embodiment of the invention, the storage driving module with the multi-state information storage function is arranged in the sub-pixel, so that the luminous brightness of the luminous device is actually determined by the image display information stored by the storage driving module. In this way, conditions are provided for each sub-pixel to be switched on to the same second data voltage during the display phase. When the sub-pixels of each row are connected with the same data signal, the sub-pixels can be written with the data signals at the same time without controlling the data signals to be written into the sub-pixels row by row, that is, the waveforms of the scanning signals can be controlled to be the same in the display stage. On the basis, if the electronic tag is provided with the driving module which is only internally used for providing each control signal in the display stage, and the external driving device is used for providing each control signal of the electronic tag in the information storage stage, the structure of the driving module in the electronic tag can be effectively simplified, and the possibility is provided for reducing the cost of the electronic tag. Therefore, compared with the prior art, the embodiment of the invention can improve the display effect of the electronic tag on the basis of ensuring lower cost of the electronic tag.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an electronic tag according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a sub-pixel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a driving timing of a sub-pixel according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a driving timing sequence of an electronic tag according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another electronic tag according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another electronic tag according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another electronic tag according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another electronic tag according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of another sub-pixel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a first transistor according to an embodiment of the present invention;
fig. 11 is a schematic diagram of an operating characteristic of a first transistor according to an embodiment of the present invention;
fig. 12 is a schematic flow chart of a driving method of an electronic tag according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a picture updating system of an electronic tag according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
The embodiment of the invention provides an electronic tag which can be realized based on an OLED (Organic Light-Emitting Device) display technology, in particular an AMOLED (Active-Matrix Organic Light Emitting Diode, active matrix Organic Light Emitting diode) display technology. Fig. 1 is a schematic structural diagram of an electronic tag according to an embodiment of the present invention. Referring to fig. 1, the electronic tag 10 includes: the display device comprises a substrate 200 and a plurality of sub-pixels 100 arranged on the substrate 200 in an array manner. The electronic label 10 is exemplarily shown in fig. 1 to include n×m (n rows and m columns) sub-pixels 100. The substrate 200 is further provided with a first power line Lvdd, a second power line Lvss, a scanning line Lscan, and a data line Ld to drive the sub-pixels 100 to emit light for displaying a picture. Illustratively, in a top-down direction, the 1 st row first power line Lvdd1 to n-th row first power line Lvddn is connected to the 1 st row sub-pixel 100 to n-th row sub-pixel 100, the 1 st row second power line lvss1 to n-th row second power line Lvssn is connected to the 1 st row sub-pixel 100 to n-th row sub-pixel 100, the 1 st row scanning line Lscan1 to n-th row scanning line Lscann is connected to the 1 st row sub-pixel 100 to n-th row sub-pixel 100, and the 1 st column data line Ld1 to m-th column data line Ldm is connected to the 1 st column sub-pixel 100 to m-th column sub-pixel 100, respectively, in a left-right direction.
Illustratively, the specific structure of each sub-pixel 100 may be the same, and the structure of the 1 st row 1 st column sub-pixel 100 is given as an example in fig. 1. Specifically, the sub-pixel 100 includes: a switching module 110, a storage driving module 120, and a light emitting device L. The storage driving module 120 is connected between the light emitting device L and the first power line Lvdd, the switching module 110 is connected between the data line Ld and the storage driving module 120, and the light emitting device L is also connected to the second power line Lvss. The switch module 110 is configured to transmit the voltage on the data line Ld to the memory driving module 120 in response to the scan signal on the scan line Lscan. The storage driving module 120 is configured to store image display information according to a first voltage transmitted on the first power line Lvdd and a first data voltage transmitted on the data line Ld, and output a driving current according to a second voltage transmitted on the power line Lvdd and a second data voltage transmitted on the data line Ld, so as to drive the light emitting device L to emit light, where the driving current is associated with the image display information.
Fig. 2 is a schematic structural diagram of a sub-pixel according to an embodiment of the present invention. Referring to fig. 1 and 2, the specific connection manner of each functional module in the sub-pixel 100 may be: the control end of the switch module 110 is electrically connected with the scanning line Lscan and is connected with the scanning signal SCAN; the first end of the switch module 110 is electrically connected with the data line Ld and is connected with the data signal VDATA; a second terminal of the switch module 110 is electrically connected to a control terminal of the storage drive module 120. The first end of the storage driving module 120 is electrically connected to the first data line Lvdd, and is connected to the first power signal VDD, the second end of the storage driving module 120 is electrically connected to the first electrode of the light emitting device L, and the second electrode of the light emitting device L is electrically connected to the second power line Lvss, and is connected to the second power signal VSS. The light emitting device L may be a current-driven organic electroluminescent diode.
Next, a driving process of one sub-pixel 100 will be described first, and a driving process of an electronic tag will be described.
Fig. 3 is a schematic diagram of a driving timing sequence of a sub-pixel according to an embodiment of the present invention. Referring to fig. 2 and 3, taking the switching module 110 turned on in response to a low level as an example, the driving process of the sub-pixel 100 includes:
in the information storage stage T01, the SCAN signal SCAN is low, the data signal VDATA is the first data voltage VDATA1, the first power signal VDD is the first voltage VDD1, and the second power signal VSS is low. The switch module 110 transmits the first data voltage VDATA1 to the control terminal of the storage driving module 120 in response to the low level conduction of the SCAN signal SCAN; the storage driving module 120 stores the image display information under the first voltage VDD1 and the first data voltage VDATA 1.
In the display stage T02, the SCAN signal SCAN is at a low level, the data signal VDATA is at a second data voltage VDATA2, the first power signal VDD is at a second voltage VDD2, and the second power signal VSS is at a low level. The switch module 110 transmits the second data voltage VDATA2 to the control terminal of the storage driving module 120 in response to the low level conduction of the SCAN signal SCAN; the storage driving module 120 outputs a driving current according to the second voltage VDD2 and the second data voltage VDATA2 to drive the light emitting device L to emit light.
Wherein each storage driving module 120 has a multi-state information storage function. The drive current is associated with the image display information. Under the condition that the second voltage VDD2 and the second data voltage VDATA2 of the sub-pixel 100 are unchanged, the driving current generated by the storage driving module 120 in the display period T02 will change according to the different image display information stored in the information storage period T01, so that the light emitting brightness of the light emitting device L is different. In the information storage phase T01 and the display phase T02, the second power supply signal may be kept at the same low level, for example, at a negative voltage value. It should be noted that, the first voltage VDD1 and the second voltage VDD2 of the first power signal VDD are both high levels, and are usually positive voltage values, but the voltage value of the first voltage VDD1 is different from the voltage value of the second voltage VDD2, for example, the first voltage VDD1 is higher than the second voltage VDD2. Thus, the first voltage VDD1 can enable the storage driving module 120 to effectively store image display information in the information storage stage T01, and the second voltage VDD2 can enable the storage driving module 120 to be normally driven by the second data voltage VDATA2 and the second voltage VDD2 and generate driving current according to the image display information in the display stage T02 without damaging the information stored in the storage driving module 120. The first data voltage VDATA1 and the second data voltage VDATA2 may be the same or different, and may be specifically set according to practical requirements, which is not limited herein.
Fig. 4 is a schematic diagram of a driving timing sequence of an electronic tag according to an embodiment of the present invention. Referring to fig. 1 and 4, still taking the example that the switching module 110 in each sub-pixel 100 is turned on in response to a low level, the driving process of the sub-pixel 100 includes:
information storage phase T1: in the whole information storage phase T1, the first power supply signals all keep the first voltage, and the second power supply signals all keep the low level; the scanning signals of each row are changed to the low level in a line-by-line time-sharing manner, and the time for changing the scanning signals to the low level is not overlapped. The information storage stage T1 may be divided into n sub-storage stages, i.e., sub-storage stage T11 to sub-storage stage T1n, according to the time at which each row scan signal changes to a low level. In each sub-storage stage, the m data lines respectively transmit the first data voltages to the m sub-pixels 100 in a row, so that each storage driving module 120 in the row stores image display information according to the first voltages and the first data voltages to which it is connected. The first data voltages accessed by the sub-pixels 100 in a row may be different, and the first data voltages transmitted by the same data line in different sub-storage stages may also be different. The first voltages of the sub-pixels 100 in different rows may be the same or different, and may be specifically set according to actual requirements.
Display phase T2: the first power signal is maintained at the second voltage and the second power signal is maintained at the low level throughout the display period T2. All the scan signals can be kept at low level at the same time, and the switch modules 110 of all the sub-pixels 100 are controlled to be turned on at the same time, and the second data voltages transmitted on the data lines Ld are transmitted to the storage driving modules 120, so that each storage driving module 120 outputs driving current according to the second voltages, the second data voltages and the stored image display information thereof, and the driving current drives the light emitting devices L to emit light.
As can be seen from an analysis of the driving process of the sub-pixel 100, the light emitting brightness of the light emitting device L in the sub-pixel 100 is actually determined by the image display information stored in the storage driving module 120. Then, control of the final color display can be achieved by controlling only the image display information stored by each sub-pixel 100, which provides for each sub-pixel 100 to access the same second data voltage VDATA 2. In the display stage T2, if the sub-pixels 100 are connected to the same second data voltage VDATA2, the scan signals do not need to be controlled to change row by row, but all the switch modules 110 can be directly controlled to be turned on simultaneously, so that all the sub-pixels 100 operate simultaneously. That is, in the display period T2, all the second data voltages may be dc signals having the same voltage value. And, the scan signal having the level change in the information storage period T1 is referred to as a first scan signal, and the scan signal having the level change in the display period T2 is referred to as a second scan signal, all of the second scan signals may be dc signals having the same voltage value.
Since the application scenario of the electronic tag 10 generally requires that the electronic tag 10 display the same picture for a long time, that is, the electronic tag 10 needs to be in the display stage T2 for a long time and maintain the same display state; in practice, the frequency of use of the information storage phase T1 is not high. Under such a demand condition, the electronic tag 10 may be provided with only a built-in driving module for providing the respective control signals of the display stage T2, and the respective control signals of the electronic tag 10 in the information storage stage T1 may be provided by an external driving device. Thus, the electronic tag 10 can display a static color picture without a driving chip or a driving circuit board inside the electronic tag 10, only a direct current power supply is needed, and if the display picture needs to be modified, the driving device is connected with the electronic tag 10 to rewrite image display information. Therefore, the present embodiment can effectively simplify the structure of the built-in driving module of the electronic tag 10, and reduce the cost of the electronic tag 10. Meanwhile, as all control signals in the display stage are direct current signals, the electronic tag 10 does not need to be controlled to refresh pictures frame by frame, and the power consumption of the electronic tag can be effectively reduced.
In the embodiment of the invention, the electronic tag 10 is arranged to be composed of a plurality of sub-pixels 100 comprising the light emitting device L with the active light emitting function, which is equivalent to applying the OLED display technology to the electronic tag, so that the display color of the electronic tag 10 is rich and bright, and the display effect of the electronic tag 10 is greatly improved. And the limitation of the use scene of the electronic tag 10 is reduced without the assistance of an external light source. Meanwhile, in the embodiment of the present invention, the storage driving module 120 having the multi-state information storage function is included in the sub-pixel 100, so that the light emitting brightness of the light emitting device L is actually determined by the image display information stored in the storage driving module 120. Thus, conditions are provided for each sub-pixel 100 to access the same second data voltage VDATA2 during the display period T2. When the sub-pixels 100 of each row are connected to the same data signal, it is not necessary to control the data signal to be written into the sub-pixels 100 row by row, but the sub-pixels 100 can be written with the data signal at the same time, that is, the waveforms of the scanning signals can be controlled to be the same in the display stage T2. On this basis, if the electronic tag 10 is provided with only the driving module for providing the control signals of the display stage T2, and the external driving device provides the control signals of the electronic tag 10 in the information storage stage T1, the structure of the driving module in the electronic tag 10 can be effectively simplified, and the possibility is provided for reducing the cost of the electronic tag 10. Therefore, compared with the prior art, the embodiment of the invention can improve the display effect of the electronic tag 10 on the basis of ensuring lower cost of the electronic tag 10.
In the following, with reference to fig. 5 to 8, the structure of the electronic tag 10 will be described when only the driving module for providing the control signals in the display stage T2, that is, only the functional module for providing the second voltage, the second power signal, the second data voltage, and the second scan signal in the dc mode, is built in the electronic tag 10.
Fig. 5 is a schematic structural diagram of another electronic tag according to an embodiment of the present invention. Referring to fig. 5, in an embodiment, optionally, the electronic tag 10 further includes: a first direct current power module 210 for providing a second data voltage to each data line; a second dc power module 220 for providing a second scan signal to each scan line; a third dc power module 230 for providing a second voltage to each of the first power lines; the fourth dc power module 240 is configured to provide the second power signal to each second power line. The first dc power module 210 may include m output ports, which are respectively connected to m data lines in a one-to-one correspondence; the second dc power module 220 may include n output ports, which are respectively connected to n scan lines in a one-to-one correspondence manner; the third dc power module 230 may include only one output port, and be connected to n first power lines through the output port via a connection line Lvdd 0; the fourth dc power module 240 may include only one output port, and be connected to n second power lines through the output port via a connection line Lvss 0.
Fig. 6 is a schematic structural diagram of another electronic tag according to an embodiment of the present invention. Referring to fig. 6, unlike in fig. 5, in the present embodiment, the first dc power module 210 includes only one output port and is connected to m data lines through the connection line Ld0 through the output port; the second dc power supply module 220 includes only one output port, and is connected to n scan lines via the output port via a connection line Lscan 0. In this way, the output ports of the first dc power module 210 and the second dc power module 220 can be reduced, the module structure is simplified, and the cost is reduced.
Based on the above embodiments, optionally, at least two dc power modules may be combined into one dc power module, and different signals are provided by setting the combined dc power modules to output different voltages through different output ports, so as to further simplify the structure of the electronic tag. For example, as shown in fig. 7, the electronic tag 10 includes: the fifth dc power module 250 includes four output ports, the first output port is connected to n first power lines through a connection line Lvdd0, the second output port is connected to n scan lines through a connection line Lscan0, the third output port is connected to n second power lines through a connection line Lvss0, and the fourth output port is connected to m data lines through a connection line Ld 0.
The above embodiments exemplarily show that the power lines are disposed laterally, and the number of the first power lines and the number of the second power lines are the same as the number of rows of the sub-pixels 100, but are not limited to the present invention. In other embodiments, at least one power line may be disposed longitudinally, and the number of the power lines is the same as the number of columns of the sub-pixels 100. As shown in fig. 8, the first power lines and the second power lines are disposed longitudinally, and each has m lines, and are connected to m rows of sub-pixels 100 in a one-to-one correspondence.
Based on the above embodiments, the substrate 200 may be a flexible substrate, so that the electronic tag 10 has the advantage of being bendable, and the problem that the conventional electronic ink tag or liquid crystal tag is difficult to bend is solved.
The above embodiments exemplarily give the overall structure of the electronic tag, and a specific structure that the sub-pixel may have will be described below.
Fig. 9 is a schematic diagram of another sub-pixel structure according to an embodiment of the present invention. Referring to fig. 9, in one embodiment, optionally, the switch module 110 includes: a second transistor M2; the grid electrode of the second transistor M2 is electrically connected with the scanning line and is connected with the scanning signal SCAN; the first pole of the second transistor M2 is electrically connected with the data line and is connected with a data signal VDATA; the second pole of the second transistor M2 is electrically connected to the memory driving module 120, specifically to the control terminal of the memory driving module 120. The first pole of the second transistor M2 may be referred to as a source, the second pole may be referred to as a drain, and the source and the drain of the second transistor M2 may be exchanged due to the symmetrical structure of the second transistor M2, which is not particularly distinguished and limited herein. The switch module 110 is configured by a transistor in this embodiment, so that the structure of the switch module 110 is simple and easy to implement.
With continued reference to FIG. 9, in one embodiment, optionally the storage drive module 120 includes: the first transistor M1 is a floating gate transistor, so that the first transistor M1 has a multi-state information storage function. The gate of the first transistor M1 is electrically connected to the switch module 110; a first pole of the first transistor M1 is electrically connected with a first power line and is connected with a first power signal VDD; the second electrode of the first transistor M1 is electrically connected to the light emitting device L, specifically, may be electrically connected to the anode of the light emitting device L. The first pole of the first transistor M1 may be referred to as a source, and the second pole may be referred to as a drain, and the source and the drain of the first transistor M1 may be interchanged due to the symmetrical structure, which is not particularly distinguished and limited herein. The memory driving module 120 is configured by a transistor in this embodiment, so that the memory driving module 120 has a simple structure and is easy to implement.
Taking the first transistor M1 as a P-type transistor as an example, the principle of the first transistor M1 storing image display information and generating driving current is as follows: the first voltage of the first power supply signal VDD is set to be greater than the second voltage. In the information storage stage, by applying the first data voltage and the large first voltage to the first transistor M1, the amount of charge stored in the floating gate can be changed, thereby changing the basic electrical characteristics of the first transistor M1, i.e., the threshold voltage, which characterizes the image display information. Since the floating gate is electrically isolated, the threshold voltage of the first transistor M1 remains in the state just written, i.e., the image display information is stored, after the first data voltage and the first voltage are removed. In the display stage, the second data line voltage and the small second voltage are applied to the first transistor M1, so that the threshold voltage of the first transistor M1 is not changed, i.e., the information stored in the first transistor M1 is not destroyed; at this stage, the first transistor M1 is the same as a conventional transistor having a fixed threshold voltage, and determines whether to turn on or not according to the relationship between the voltage difference between its gate and the first pole and the threshold voltage. That is, in the display stage, the first transistor M1 generates a driving current according to its threshold voltage under the driving of the second voltage and the second data voltage. The threshold voltage of the first transistor M1 is not changed again until the first transistor M1 is applied with a large first voltage.
Alternatively, the first transistor M1 may include one floating gate or a plurality of floating gates, preferably a plurality of floating gates, so that the first transistor M1 can store more state information. The structure of the first transistor M1 having a plurality of floating gates is described below.
Fig. 10 is a schematic structural diagram of a first transistor according to an embodiment of the present invention. Referring to fig. 10, in one embodiment, the first transistor M1 optionally includes a substrate layer 310, a gate 350, a first electrode 330, a second electrode 340, 2 floating gates, and a 3-layer gate insulating layer.
Wherein, the two sides of the top of the substrate layer 310 are respectively provided with a first diffusion region 321 and a second diffusion region 322; the first electrode 330 is in contact with the first diffusion region 321, and the first electrode of the first transistor M1 is drawn out from the first electrode 330; the second electrode 340 is in contact with the second diffusion region 322, and the second pole of the first transistor M1 is drawn out from the second electrode 340. On the top surface of the substrate layer 310, a first gate insulating layer 371 is provided at a position between the first electrode 330 and the second electrode 340, a floating gate 361 and a floating gate 362 are stacked on one side of the first gate insulating layer 371 away from the substrate layer 310, and a second gate insulating layer 372 is provided between the two floating gates; the gate 350 is disposed on the top layer, and a third gate insulating layer 373 is disposed between the gate 350 and the floating gate 362. Illustratively, the gate insulating layer may be: a silicon nitride layer, a silicon oxide layer, or a stacked structure of silicon nitride and silicon oxide.
In fig. 10, the structure of the floating gate transistor is illustrated by taking the example in which the first transistor M1 includes two floating gates. In practical applications, more floating gates may be included in the first transistor M1, so long as a gate insulating layer is disposed between adjacent floating gates. The greater the number of floating gates in the first transistor M1, the greater the memory state of the first transistor M1. The operating characteristics of the first transistor M1 in the 6-storage state are exemplarily given in fig. 11. As can be seen from fig. 11, in different states, the same gate-source voltage difference VGS of the first transistor M1 corresponds to different driving currents IDS, that is, the same second voltage and second data voltage are applied to the first transistor M1 storing different image display information (different threshold voltages), and the driving currents generated by the first transistor M1 are different.
It should be noted that, in the above embodiments, the P-type transistors are exemplified as the transistors, but the invention is not limited thereto, and in other embodiments, at least some of the transistors may be N-type transistors according to the requirements, and the voltage values of the corresponding control signals may be adjusted accordingly.
In order to enable electronic tag 10 to display a color image, each sub-pixel 100 in electronic tag 10 may include a red sub-pixel, a blue sub-pixel, and a green sub-pixel, and may further include a white sub-pixel. The number and arrangement of the sub-pixels of each color can be set according to the requirements.
The embodiment of the invention also provides a driving method of the electronic tag, which is used for driving the electronic tag provided by any embodiment of the invention, and has corresponding beneficial effects. Fig. 12 is a flow chart of a driving method of an electronic tag according to an embodiment of the present invention. Referring to fig. 12, the driving method of the electronic tag includes:
s110, an information storage stage, namely transmitting a first voltage to a first power line; transmitting a first scanning signal to the scanning line, and controlling the switch module connected with the scanning line to be conducted; and when the switch module is conducted, the first data voltage is transmitted to the data line, so that each storage driving module stores image display information according to the first voltage and the first data voltage.
The first scanning signals control the switch modules in the sub-pixels to be conducted row by row, and the image information storage process of the storage driving modules of the sub-pixels is conducted row by row. The first scan signal, the first voltage, and the first data voltage in this step may be provided by an external driving device, for example.
S120, in a display stage, transmitting a second voltage to the first power line; transmitting a second scanning signal to the scanning line, and controlling the switch module to be conducted; and transmitting a second data voltage to the data line, so that each storage driving module outputs a driving current according to the second voltage and the second data voltage to drive the light emitting device to emit light, and the driving current is related to the image display information.
Wherein the light emitting brightness of the light emitting device in the sub-pixel is actually determined by the image display information stored by the storage driving module. Control of the final color display can then be achieved by controlling only the image display information stored by each sub-pixel, which provides for each sub-pixel to access the same second data voltage. If all the sub-pixels are connected to the same second data voltage in the display stage, the scanning signals do not need to be controlled to change row by row any more because the data signals connected to all the rows of the sub-pixels are the same, and all the switch modules can be directly controlled to be turned on at the same time, so that all the sub-pixels work at the same time. That is, in the display stage, all the second data voltages may be dc signals having the same voltage value, all the second scan signals may also be dc signals having the same voltage value, and the first voltage is also a dc signal in the stage. Since the driving module for providing each dc signal in the display stage can be built in the electronic tag.
In the embodiment of the invention, the electronic tag is composed of a plurality of sub-pixels comprising the light-emitting device with the active light-emitting function, which is equivalent to applying the OLED display technology to the electronic tag, so that the display color of the electronic tag is rich and bright, and the display effect of the electronic tag is greatly improved. And the auxiliary of an external light source is not needed, so that the limitation on the use scene of the electronic tag is reduced. Meanwhile, in the embodiment of the invention, the sub-pixel comprises a storage driving module with a multi-state information storage function, and the luminous brightness of the luminous device is actually determined by the image display information stored by the storage driving module. In this way, conditions are provided for each sub-pixel to be switched on to the same second data voltage during the display phase. The same second data voltage is provided for each row of sub-pixels, so that the sub-pixels can write data signals at the same time, that is, the second scanning signal can be set as a direct current signal with the same voltage value instead of controlling the data signals to write into the sub-pixels row by row. On the basis, if the electronic tag is provided with the driving module which is only internally used for providing each control signal in the display stage, the structure of the driving module in the electronic tag can be effectively simplified, and the possibility is provided for reducing the cost of the electronic tag. Therefore, compared with the prior art, the embodiment of the invention can improve the display effect of the electronic tag on the basis of ensuring lower cost of the electronic tag.
The embodiment of the invention also provides a picture updating system of the electronic tag, which comprises a driving device and a plurality of electronic tags, wherein the electronic tags are provided by any embodiment of the invention and have corresponding beneficial effects. The driving device can provide each control signal needed in the information storage stage for each electronic tag, and the control signal is used for updating the image display information stored in the storage driving module of each sub-pixel in each electronic tag. Fig. 13 is a schematic structural diagram of a picture updating system of an electronic tag according to an embodiment of the present invention. Referring to fig. 13, the picture update system of the electronic tag includes: a driving device 400 and a plurality of electronic labels 10. The driving apparatus 400 includes: the scan driving module 410, the power module 420, and the data voltage providing module 430.
The scan driving module 410 is configured to provide a scan signal, specifically, a first scan signal, to a scan line of the electronic tag 10; the power module 420 is configured to provide a first voltage to a first power line of the electronic tag 10; the data voltage providing module 430 is configured to provide a first data voltage to the data line of the electronic tag 10. Since the value of the second power signal is constant throughout the information storage phase and the display phase, the second power signal can be always provided by the electronic tag 10 itself without additional provision. Illustratively, the electronic label 10 may be a shelf label or a product display label, or the like.
In this embodiment, one driving device 400 is provided to update the pictures of a plurality of electronic tags 10, so that the one-to-many functions of the driving device 400 and the electronic tags 10 are realized, and a large amount of module driving cost can be saved.
As for the connection manner of the driving device 400 and the electronic tag 10, the driving device 400 is illustratively detachably connected to the electronic tag 10. Specifically, interfaces connected to each data line, each scan line, and each first power line may be reserved in the electronic tag, for plugging with the driving device 400. In practical application, a worker can update the image display information of each electronic tag 10 by inserting the driving device 400 into the plurality of electronic tags 10 in sequence.
Further, in order to improve the convenience of updating the picture of the electronic tag 10, the driving device 40 may be always connected to each electronic tag 10, and when the picture needs to be updated, the driving device 400 may transmit the control signal to different electronic tags 10 in a time-sharing manner.
On the basis of the above embodiments, optionally, the screen updating system of the electronic tag may further include: a wireless communication module; the driving apparatus 400 may transmit signals to the electronic tag 10 through the scan driving module 410, the power module 420, and the data voltage providing module 430 based on the wireless communication module. In this embodiment, the driving device 400 and the electronic tag 10 are configured to transmit signals through the wireless communication module, so that the number of connection lines in the system can be reduced, the system structure is simplified, and the method for updating the picture of the electronic tag 10 is more convenient and flexible.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An electronic tag, comprising:
a substrate;
an array of subpixels disposed on the substrate, the subpixels including: a switching module, a storage driving module, and a light emitting device;
the storage driving module is connected between the light emitting device and the first power line, and the switch module is connected between the data line and the storage driving module; the switch module is used for responding to the conduction of a scanning signal on a scanning line and transmitting the voltage on the data line to the storage driving module;
the storage driving module is used for storing image display information according to a first voltage transmitted by the first power line and a first data voltage transmitted by the data line, outputting driving current according to a second voltage transmitted by the first power line and a second data voltage transmitted by the data line so as to drive the light emitting device to emit light, and the driving current is related to the image display information;
the storage drive module includes: a first transistor, a grid electrode of which is electrically connected with the switch module; a first pole of the first transistor is electrically connected to the first power line; a second electrode of the first transistor is electrically connected with the light emitting device;
the switch module includes: a second transistor; the gate of the second transistor is electrically connected with the scan line, the first electrode of the second transistor is electrically connected with the data line, and the second electrode of the second transistor is electrically connected with the memory driving module.
2. The electronic tag of claim 1, wherein the first transistor is a floating gate transistor.
3. The electronic tag of claim 2, wherein the first voltage and the first data voltage are used to change a threshold voltage of the first transistor, the threshold voltage being characteristic of the image display information.
4. The electronic tag of claim 2, wherein the first transistor comprises a plurality of floating gates, and a gate insulating layer is disposed between adjacent floating gates;
the gate insulating layer includes a silicon nitride layer, a silicon oxide layer, or a stacked structure of silicon nitride and silicon oxide.
5. The electronic tag of claim 1, wherein the first voltage is greater than the second voltage;
the second data voltages transmitted by all the data lines are equal.
6. A driving method of an electronic tag, characterized by being used for driving the electronic tag according to any one of claims 1 to 5; the driving method of the electronic tag comprises the following steps:
an information storage stage transmitting a first voltage to the first power line; transmitting a first scanning signal to the scanning line, and controlling the switch module connected with the scanning line to be conducted; when the switch module is conducted, the first data voltage is transmitted to the data line, so that each storage driving module stores image display information according to the first voltage and the first data voltage;
a display stage transmitting a second voltage to the first power line; transmitting a second scanning signal to the scanning line, and controlling the switch module to be conducted; and transmitting a second data voltage to the data line, so that each storage driving module outputs a driving current according to the second voltage and the second data voltage to drive the light emitting device to emit light, and the driving current is associated with the image display information.
7. The driving method of an electronic tag according to claim 6, wherein the second scan signal is a direct current signal.
8. A picture updating system of an electronic tag, comprising: a driving device and a plurality of electronic labels according to claims 1-5;
the driving device includes:
the scanning driving module is used for providing scanning signals for the scanning lines of the electronic tag;
the power module is used for providing a first voltage for a first power line of the electronic tag;
and the data voltage supply module is used for supplying a first data voltage to the data line of the electronic tag.
9. The picture updating system of an electronic tag of claim 8, wherein the driving means is detachably connected to the electronic tag.
10. The picture update system of an electronic tag of claim 9, further comprising: a wireless communication module; the driving device transmits signals to the electronic tag through the scanning driving module, the power supply module and the data voltage providing module based on the wireless communication module.
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