Driving circuit for realizing multicolor electronic paper
By adding voltage adjustment and conversion circuits to the drive board, the 1-bit IC is used to realize the driving of multi-color electronic paper, which solves the problem that the traditional two-color driving board cannot drive multi-color electronic paper, reducing costs and improving utilization.
Patent Information
- Application Number
- CN202421323476.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-06-11
AI Technical Summary
Traditional two-color drive boards such as black and white cannot drive multi-color electronic paper such as three-color, resulting in high costs, high technical uncertainty, and waste of the two-color drive board.
By adding a linkage between the voltage adjustment circuit, the first voltage conversion circuit and the second voltage conversion circuit in the driving board, the driving of multi-color electronic paper is realized by using a 1-bit IC, reducing development costs and improving utilization.
The function of 1-bit IC to drive multi-color electronic paper is realized, which reduces development costs, improves the utilization rate of the driver board, and avoids waste of resources.
Smart Images
Figure CN222826074U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of multi-color electronic paper driving, and in particular relates to a driving circuit for realizing multi-color electronic paper. Background Art
[0002] In recent years, with the continuous advancement of color electronic paper technology, three-color and other multi-color electronic paper has gradually emerged. These technologies achieve up to tens of thousands of full-color gamut screen displays through voltage control and dynamic particle combination color mixing, with dynamic color mixing and high color gamut display effects, presenting a more visually impactful color printed poster effect.
[0003] In addition, with the continuous development of technology, the application scenarios of three-color and multi-color e-paper are constantly expanding. For example, in the field of education, the application of products such as e-paper conference table cards and e-paper digital door cards provides new solutions for paperless office and green display. In the fields of retail, logistics, medical care, etc., color e-paper technology also shows broad application prospects.
[0004] However, since traditional black and white and other two-color driver boards are based on 1-bit ICs, they cannot drive three-color or other multi-color e-papers, and the development of new three-color or other multi-color driver boards requires at least 3-bit signals to represent multiple different colors, the cost is too high and there are some technical uncertainties, which also results in a large amount of waste of two-color driver boards that cannot be used.
[0005] Therefore, further improvements are made to the above problems. Utility Model Content
[0006] The main purpose of the utility model is to provide a driving circuit for realizing multi-color electronic paper, which is linked by a voltage adjustment circuit, a first voltage conversion circuit and a second voltage conversion circuit, so that a 1-bit IC can realize multi-color electronic paper driving, reduce the development cost of the multi-color driving board, improve the utilization rate of the 1-bit IC driving board, save resources and avoid waste, and greatly save development costs.
[0007] To achieve the above objectives, the utility model provides a driving circuit for realizing multi-color electronic paper, including a voltage adjustment circuit, a first voltage conversion circuit and a second voltage conversion circuit, wherein the voltage adjustment circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively, wherein:
[0008] The voltage adjustment circuit includes a potentiometer U1, a Vlogic pin of the potentiometer U1 is connected to a first power supply terminal (VDD3V3, used to be set as an I2C power supply pin to ensure correct I2C communication, and pins 13 and 14 are used to communicate with a main controller) and is also grounded through a capacitor C1 and a capacitor C2 respectively;
[0009] The first voltage conversion circuit includes a regulator U2, a field effect transistor Q1 and a field effect transistor Q2, the B2 pin of the potentiometer U1 is electrically connected to the FB pin of the regulator U2, the VIN pin of the regulator U2 is connected to the second power supply terminal (VCC12V) through the field effect transistor Q1 and the fuse F1 in one way and is grounded through the capacitor C5 in the other way, the gate of the field effect transistor Q1 is electrically connected to the drain of the field effect transistor Q2 through the resistor R4 and the gate of the field effect transistor Q2 is connected to the first switch signal input terminal (VGH_SW1_FPGA, connected to the main controller) through the resistor R6, and the SW pin of the regulator U2 is connected to the output terminal VGH (connected to the electronic paper) through the inductor L1 and the diode D1 in turn;
[0010] The second voltage conversion circuit includes a regulator U3, a field effect transistor Q3 and a field effect transistor Q4. The W2 pin of the potentiometer U1 is electrically connected to the FB pin of the regulator U3 through resistors R3 and R10 in sequence. The VIN pin of the regulator U3 is connected to the second power supply terminal (VCC12V) through the field effect transistor Q3 and the fuse F2. The gate of the field effect transistor Q3 is electrically connected to the drain of the field effect transistor Q4 through resistor R12, and the gate of the field effect transistor Q4 is connected to the second switch signal input terminal (VGH_SW2_FPGA, the main controller, and VGH_SW1_FPGA can only be opened one way at a time) through resistor R15. The SW pin of the regulator U3 is connected to the output terminal VGH through diode D2.
[0011] As a further preferred technical solution of the above technical solution, a resistor R2 is connected between the gate and source of the field effect transistor Q1, a capacitor C7 is connected between the gate and source of the field effect transistor Q2, and a resistor R9 is connected in parallel at both ends of the capacitor C7.
[0012] As a further preferred technical solution of the above technical solution, a resistor R11 is connected between the gate and source of the field effect transistor Q3, a capacitor C10 is connected between the gate and source of the field effect transistor Q4, and a resistor R16 is connected in parallel at both ends of the capacitor C10.
[0013] As a further preferred technical solution of the above technical solution, the cathode of the diode D1 is grounded through the capacitor C3, the resistor R5 and the resistor R7 in sequence, the common end of the resistor R5 and the resistor R7 is electrically connected to the FB pin of the regulator U2, and the cathode of the diode D1 is also electrically connected to the end of the resistor R3 away from the potentiometer U1.
[0014] As a further preferred technical solution of the above technical solution, the cathode of the diode D2 is grounded through the resistor R10 and the resistor R14 in sequence, and the anode of the diode D2 is electrically connected to the drain of the field effect transistor Q3 through the inductor L2. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 The utility model is a circuit diagram of a driving circuit for realizing multi-color electronic paper. DETAILED DESCRIPTION
[0016] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.
[0017] The utility model discloses a driving circuit for realizing multi-color electronic paper. The specific embodiments of the utility model are further described below in conjunction with preferred embodiments.
[0018] In the embodiments of the present invention, those skilled in the art will note that the electronic paper and the like involved in the present invention may be regarded as prior art.
[0019] Preferred embodiments.
[0020] like Figure 1 As shown, the utility model discloses a driving circuit for realizing multi-color electronic paper, including a voltage adjustment circuit, a first voltage conversion circuit and a second voltage conversion circuit, wherein the voltage adjustment circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively, wherein:
[0021] The voltage adjustment circuit includes a potentiometer U1, a Vlogic pin of the potentiometer U1 is connected to a first power supply terminal (VDD3V3, used to be set as an I2C power supply pin to ensure correct I2C communication, and pins 13 and 14 are used to communicate with a main controller) and is also grounded through a capacitor C1 and a capacitor C2 respectively;
[0022] The first voltage conversion circuit includes a regulator U2, a field effect transistor Q1 and a field effect transistor Q2, the B2 pin of the potentiometer U1 is electrically connected to the FB pin of the regulator U2, the VIN pin of the regulator U2 is connected to the second power supply terminal (VCC12V) through the field effect transistor Q1 and the fuse F1 in one way and is grounded through the capacitor C5 in the other way, the gate of the field effect transistor Q1 is electrically connected to the drain of the field effect transistor Q2 through the resistor R4 and the gate of the field effect transistor Q2 is connected to the first switch signal input terminal (VGH_SW1_FPGA, connected to the main controller) through the resistor R6, and the SW pin of the regulator U2 is connected to the output terminal VGH (connected to the electronic paper) through the inductor L1 and the diode D1 in turn;
[0023] The second voltage conversion circuit includes a regulator U3, a field effect transistor Q3 and a field effect transistor Q4. The W2 pin of the potentiometer U1 is electrically connected to the FB pin of the regulator U3 through resistors R3 and R10 in sequence. The VIN pin of the regulator U3 is connected to the second power supply terminal (VCC12V) through the field effect transistor Q3 and the fuse F2. The gate of the field effect transistor Q3 is electrically connected to the drain of the field effect transistor Q4 through resistor R12, and the gate of the field effect transistor Q4 is connected to the second switch signal input terminal (VGH_SW2_FPGA, the main controller, and VGH_SW1_FPGA can only be opened one way at a time) through resistor R15. The SW pin of the regulator U3 is connected to the output terminal VGH through diode D2.
[0024] Specifically, a resistor R2 is connected between the gate and source of the field effect transistor Q1 , a capacitor C7 is connected between the gate and source of the field effect transistor Q2 , and two ends of the capacitor C7 are connected in parallel with a resistor R9 .
[0025] More specifically, a resistor R11 is connected between the gate and source of the field effect transistor Q3, a capacitor C10 is connected between the gate and source of the field effect transistor Q4, and a resistor R16 is connected in parallel at both ends of the capacitor C10.
[0026] Furthermore, the cathode of the diode D1 is grounded via the capacitor C3, the resistor R5 and the resistor R7 in sequence, the common end of the resistor R5 and the resistor R7 is electrically connected to the FB pin of the regulator U2, and the cathode of the diode D1 is also electrically connected to an end of the resistor R3 away from the potentiometer U1.
[0027] Furthermore, the cathode of the diode D2 is grounded via the resistor R10 and the resistor R14 in sequence, and the anode of the diode D2 is electrically connected to the drain of the field effect transistor Q3 via the inductor L2.
[0028] For this utility model:
[0029] Three-color and other multi-color electronic paper types have three or more colors of particles. The traditional driving method uses 1-bit to drive two particles with different voltages to move at a time. It is impossible to directly express multi-color driving because 1-bit can only represent two states (for example, on or off, black or white). This solution achieves multi-color driving by adding peripheral circuits to achieve time-sharing refresh.
[0030] This solution achieves multi-color driving by adding peripheral circuits to the driving board and driving two colors of particles each time through a time-sharing refresh mode.
[0031] If there are several colors of electronic paper, there will be particles of different colors and voltages in the electronic paper.
[0032] The first type of driving circuit is a positive and negative large voltage driving circuit.
[0033] The second type of driving circuit is a dynamic positive and dynamic negative voltage driving circuit.
[0034] Take the red, black and white three-color electronic paper as an example (black: large positive voltage, red: small positive voltage, white: large negative voltage)
[0035] 1. First, the host computer splits the original black, white and red three-color image into two two-color images, one black and white image and one red and white image. (The four-color image of the four-color electronic paper is split into three two-color images, and the logic of multi-color electronic paper splitting is similar)
[0036] 2. Then the host computer transmits the first picture, and the driver board switches to the first driving circuit to start drawing the first picture. At this time, the main controller turns on the second switch signal input terminal VGH_SW2_FPGA to make the second voltage conversion circuit work, so that the first voltage is output at the output terminal VGH, so that the electronic paper draws the first picture.
[0037] 3. Then, when the first picture is drawn, the host computer transmits the second picture, and the driver board switches to the second driving circuit to start drawing the second picture. At this time, the main controller opens the first switch signal input terminal VGH_SW1_FPGA to make the first voltage conversion circuit work, so that the second voltage is output at the output terminal VGH, so that the electronic paper draws the first picture.
[0038] 4. The last two pictures refreshed one after another are combined into a complete three-color picture.
[0039] For this utility model:
[0040] By adding a voltage conversion function to the original driving board, circuit conversion and voltage dynamic adjustment can be achieved according to actual drawing conditions while satisfying the original driving board functions.
[0041] The voltage regulation circuit uses I2C communication with a digital potentiometer U1 to adjust the output resistance of the potentiometer U1. The voltage at the feedback terminal FB of the regulator U2 / U3 is changed through the resistance divider of the potentiometer U1, thereby changing the output voltage of VGH and ultimately achieving different voltages required to drive different colors.
[0042] The first voltage conversion circuit uses a miniature drop-switch voltage regulator that can achieve fast transient response, and is matched with a voltage regulation module to achieve an adjustable voltage output in the range of 2V to 9V.
[0043] The second voltage conversion circuit uses a miniature, high-efficiency, step-up DC / DC regulator, which achieves a stable voltage output higher than 12V through feedback resistor matching.
[0044] By controlling and converting the circuit through the host computer (main controller), it is possible to dynamically switch the circuit setting voltage according to the performance of the electronic paper particle voltage to drive the corresponding particles inside the electronic paper to move, so as to achieve the corresponding color refresh. Adding a voltage adjustment circuit can control the voltage more accurately and improve the drawing effect of the electronic paper. There is no need to update the IC or redesign the driver board, which greatly saves the hardware design cost.
[0045] It is worth mentioning that the technical features such as electronic paper involved in this utility model patent application should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected according to the conventional methods in the field, and should not be regarded as the invention point of this utility model patent. This utility model patent will not be further elaborated.
[0046] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.
Claims
1. A driving circuit for realizing multi-color electronic paper, characterized in that: It includes a voltage adjustment circuit, a first voltage conversion circuit and a second voltage conversion circuit, wherein the voltage adjustment circuit is electrically connected to the first voltage conversion circuit and the second voltage conversion circuit respectively, wherein: The voltage adjustment circuit comprises a potentiometer U1, a Vlogic pin of the potentiometer U1 is connected to the first power supply terminal and is also connected to the ground through a capacitor C1 and a capacitor C2 respectively; The first voltage conversion circuit includes a regulator U2, a field effect transistor Q1 and a field effect transistor Q2, the B2 pin of the potentiometer U1 is electrically connected to the FB pin of the regulator U2, the VIN pin of the regulator U2 is connected to the second power supply terminal through the field effect transistor Q1 and the fuse F1 in one way and is grounded through the capacitor C5 in the other way, the gate of the field effect transistor Q1 is electrically connected to the drain of the field effect transistor Q2 through the resistor R4 and the gate of the field effect transistor Q2 is connected to the first switch signal input terminal through the resistor R6, and the SW pin of the regulator U2 is connected to the output terminal VGH through the inductor L1 and the diode D1 in sequence; The second voltage conversion circuit includes a regulator U3, a field effect transistor Q3 and a field effect transistor Q4. The W2 pin of the potentiometer U1 is electrically connected to the FB pin of the regulator U3 through resistors R3 and R10 in sequence. The VIN pin of the regulator U3 is connected to the second power supply terminal through the field effect transistor Q3 and the fuse F2. The gate of the field effect transistor Q3 is electrically connected to the drain of the field effect transistor Q4 through a resistor R12, and the gate of the field effect transistor Q4 is connected to the second switch signal input terminal through a resistor R15. The SW pin of the regulator U3 is connected to the output terminal VGH through a diode D2.
2. The driving circuit for realizing multi-color electronic paper according to claim 1, characterized in that: A resistor R2 is connected between the gate and source of the field effect transistor Q1 , a capacitor C7 is connected between the gate and source of the field effect transistor Q2 , and a resistor R9 is connected in parallel at both ends of the capacitor C7 .
3. The driving circuit for realizing multi-color electronic paper according to claim 2, characterized in that: A resistor R11 is connected between the gate and source of the field effect transistor Q3 , a capacitor C10 is connected between the gate and source of the field effect transistor Q4 , and a resistor R16 is connected in parallel at both ends of the capacitor C10 .
4. The driving circuit for realizing multi-color electronic paper according to claim 3, characterized in that: The cathode of the diode D1 is grounded via the capacitor C3, the resistor R5 and the resistor R7 in sequence, the common end of the resistor R5 and the resistor R7 is electrically connected to the FB pin of the regulator U2, and the cathode of the diode D1 is also electrically connected to an end of the resistor R3 away from the potentiometer U1.
5. The driving circuit for realizing multi-color electronic paper according to claim 4, characterized in that: The cathode of the diode D2 is grounded via the resistor R10 and the resistor R14 in sequence, and the anode of the diode D2 is electrically connected to the drain of the field effect transistor Q3 via the inductor L2.