An ink screen color control circuit structure

Abstract

The present invention relates to an ink screen color control circuit structure, which includes a data memory, a digital-to-analog conversion circuit, and a DC-DC conversion circuit; the number of bits of the digital-to-analog conversion circuit is at least 12 bits. The digital-to-analog conversion circuit is used to perform digital-to-analog conversion on the signal output by the data memory and provide an input voltage to the DC-DC conversion circuit. The DC-DC conversion circuit includes a positive power supply output circuit and a negative power supply output circuit; the positive power supply output circuit includes a first input module, a first conversion module, and a first output module. The first input module is electrically connected to the first conversion module, and the first conversion module is electrically connected to the first output module; the negative power supply output circuit includes a second input module, a second conversion module, and a second output module. The second input module is electrically connected to the second conversion module, and the second conversion module is electrically connected to the second output module; the number of digital-to-analog conversion circuits is 8, and the number of positive power supply output circuits and negative power supply output circuits are 4 respectively.

Description

Technical Field

[0001] The present invention relates to the field of ink bottle readers, and more particularly, to a color control circuit structure for an e-ink screen. Background Art

[0002] The display of electronic paper e-ink screens (hereinafter referred to as e-ink screens) has a wide range of application spaces in fields such as price tags, educational tablets, and bus stops due to their ultra-low power consumption, low-frequency display, and power-saving characteristics. Especially when people are free, it has become common to choose an e-ink screen for reading activities, and the many functions presented by the e-ink screen are also deeply loved by people.

[0003] When people are reading an illustrated and colorful e-book or viewing a picture with rich colors, the desire for a color display screen is surely irresistible. Therefore, seeking a color high-definition e-ink screen has naturally become the general trend in the development of the e-ink screen field.

[0004] However, currently, the e-ink screens on the market are mainly black-and-white display screens, and the existing color e-ink screen display adjusts the display color, brightness, and color saturation by controlling the voltage through Pulse Width Modulation (PWM for short). Due to insufficient voltage accuracy, the display clarity of the e-ink screen is insufficient, and the color is uneven, thus failing to meet people's requirements for a color display screen and blocking people's longing for this beautiful wish. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a color control circuit structure for an e-ink screen that can make the e-ink screen display with excellent brightness, rich and diverse colors, and wonderful color saturation.

[0006] A color control circuit structure for an e-ink screen provided by the present invention has the following technical solutions:

[0007] An ink screen color control circuit structure includes a data memory, a digital-to-analog conversion circuit, and a DC-DC conversion circuit; the digital-to-analog conversion circuit has at least 12 bits, and the digital-to-analog conversion circuit is used to perform digital-to-analog conversion on the signal output by the data memory and provide an input voltage to the DC-DC conversion circuit. The DC-DC conversion circuit includes a positive power supply output circuit and a negative power supply output circuit; the positive power supply output circuit transmits the output signal to the high voltage end of the ink screen color control, and the negative power supply output circuit transmits the signal to the low voltage end of the ink screen color control; the positive power supply output circuit includes a first input module, a first conversion module, and a first output module, the first input module is electrically connected to the first conversion module, and the first conversion module is electrically connected to the first output module; the negative power supply output circuit includes a second input module, a second conversion module, and a second output module, the second input module is electrically connected to the second conversion module, and the second conversion module is electrically connected to the second output module; there are 8 digital-to-analog conversion circuits, and the numbers of the positive power supply output circuit and the negative power supply output circuit are 4 respectively.

[0008] Adopting the above technical solution, compared with the prior art, the technical solution provided by the present invention application can at least bring the following beneficial effects: By designing the digital-to-analog conversion circuit and the DC-DC conversion circuit, ultra-high-precision, adjustable large current and voltage can be obtained, and more than 30,000 colors can be displayed, enabling the display brightness, color, and color saturation to reach the best effect.

[0009] Preferably, the first input module includes a first input port Vdac1, a third resistor R3, a fifth resistor R5, and a sixth resistor R6. One end of the first input port Vdac1 is electrically connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is simultaneously electrically connected to one end of the third resistor R3 and one end of the fifth resistor R5. The other end of the fifth resistor R5 is grounded. The other end of the third resistor R3 is electrically connected to the output module. The other end of the sixth resistor R6 is also electrically connected to the first conversion module; when the output end of the digital-to-analog conversion circuit is turned on, the signal can be sent to the conversion module.

[0010] Preferably, the first conversion module includes a first inductor L1, a first capacitor C1, a first resistor R1, and a first conversion chip U1. One end of the first inductor L1 is electrically connected to an external voltage source, and the other end of the first inductor L1 is simultaneously electrically connected to the positive plate of the first capacitor C1 and the first pin of the first conversion chip U1. The negative plate of the first capacitor C1 is grounded. The fourth pin of the first conversion chip U1 is electrically connected to one end of the first resistor R1, and the other interface of the first resistor R1 is grounded. The second pin of the first conversion chip U1 is electrically connected to the first output module. The third pin of the first conversion chip U1 is electrically connected to one end of the sixth resistor R6, and other pins of the first conversion chip U1 are grounded. This module performs DC-DC conversion on the input voltage and transmits it to the output module.

[0011] Preferably, the first output module includes a first energy storage circuit, a third capacitor C3, and a first output interface +Vout. The first energy storage circuit includes a second inductor L2, a second capacitor C2, and a first diode D1. The second inductor L2, the second capacitor C2, and the first diode D1 are electrically connected to form a closed loop. The negative plate of the second capacitor C2 is grounded. One end of the second inductor L2 is also electrically connected to the second pin of the first conversion chip U1, and the other end of the second inductor is also simultaneously electrically connected to the first end of the first output interface +Vout and one end of the third resistor R3. The first end of the first output interface +Vout is electrically connected to one pin of the third capacitor C3, and the other pin of the third capacitor C3 is grounded. The second end of the first output interface +Vout is electrically connected to the high-voltage end of the color control of the ink screen: This module transmits the converted information to the high-voltage interface of the color control of the ink screen.

[0012] Preferably, the second input module includes a second input port Vdac2, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The second input port Vdac2 is electrically connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is simultaneously electrically connected to the second conversion module, one end of the ninth resistor R9, and one end of the tenth resistor R10. The other end of the ninth resistor R9 is grounded, and the other end of the tenth resistor R10 is electrically connected to the second output module. When the digital-to-analog conversion circuit outputs a signal to the second interface, the second interface can smoothly transfer the signal to the second conversion module. At the same time, setting resistors and capacitors can also protect the circuit.

[0013] Preferably, the second conversion module includes a third inductor (L3), a fourth inductor L4, a fourth capacitor C4, a seventh capacitor C7, and a second conversion chip U2. One end of the third inductor L3 is electrically connected to an external voltage source, and the other end of the third inductor L3 is simultaneously electrically connected to the positive electrode plate of the fourth capacitor C4 and the first pin of the second conversion chip U2. The negative electrode plate of the fourth capacitor C4 is grounded. The fourth pin of the second conversion chip U2 is electrically connected to one pin of the seventh capacitor C7, and the other pin of the seventh capacitor C7 is grounded. The fourth pin of the second conversion chip U2 is also electrically connected to the second output module. The second pin of the second conversion chip U2 is electrically connected to one end of the fourth inductor L4, and the other end of the fourth inductor L4 is grounded. The second pin of the second conversion chip U2 is also electrically connected to the second output module. The other pins of the second conversion chip U2 are electrically connected to the second output module.

[0014] Preferably, the second output module includes a second diode D2, a fifth capacitor C5, a sixth capacitor C6, and a second output interface - Vout. The negative electrode of the second diode D2 is electrically connected to the second pin of the second conversion chip U2, and the positive electrode of the second diode D2 is electrically connected to the second output interface - Vout. The second output interface - Vout is electrically connected to the fourth pin of the second conversion chip U2. The negative electrode plate of the fifth capacitor C5 is simultaneously electrically connected to one end of the tenth resistor R10 and the first end of the second output interface - Vout. The positive electrode plate of the fifth capacitor C5 is grounded. One pin of the sixth capacitor C6 is electrically connected to the first end of the second output interface - Vout, and the other electrode plate of the sixth capacitor C6 is grounded. The second end of the second output interface - Vout is electrically connected to the low - voltage end of the color control of the ink screen; thus, the signal can be output to the low - voltage interface of the color control.

[0015] Preferably, the digital - to - analog conversion circuit is an inverted T - type resistor network circuit; a 12 - bit digital - to - analog conversion circuit and a DC - DC conversion circuit are used to output 4095 groups of voltages to supply power to the ink screen. The color ink screen has 4 kinds of color particles and uses 8 groups of power supplies (8 * 4095 bits = 32760 groups). Therefore, the circuit can output a total of 32760 groups of voltages to control color, contrast, and clarity and make them reach the best display effect. Therefore, while accurately outputting signals, the circuit makes the output voltages diverse and precise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flowchart corresponding to the ink screen color control method of the present invention;

[0017] Figure 2 It is a 12 - bit digital - to - analog conversion circuit diagram corresponding to the ink screen color control method of the present invention;

[0018] Figure 3 This is the positive power supply output circuit diagram corresponding to the present invention;

[0019] Figure 4 This is the negative power supply output circuit diagram corresponding to the present invention. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] Combined with Figure 1 —4, this embodiment will make a detailed description of the ink screen color control circuit structure of the present invention;

[0022] An ink screen color control circuit structure includes a data memory, a digital-to-analog conversion circuit, and a DC-DC conversion circuit; the number of bits of the digital-to-analog conversion circuit is at least 12 bits. The digital-to-analog conversion circuit is used to perform digital-to-analog conversion on the signal output by the data memory and provide an input voltage to the DC-DC conversion circuit. The DC-DC conversion circuit includes a positive power supply output circuit and a negative power supply output circuit; the positive power supply output circuit transmits the output signal to the high voltage end of the ink screen color control (VPOS end in this embodiment), and the negative power supply output circuit transmits the signal to the low voltage end of the ink screen color control (VNEG end in this embodiment). The number of digital-to-analog conversion circuits is 8, and the number of positive power supply output circuits and negative power supply output circuits are 4 respectively. Each set of positive and negative power supply circuits controls one kind of original color particle, and a digital-to-analog conversion circuit outputs the signal to a DC-DC conversion circuit.

[0023] In this embodiment, the positive power output circuit includes a first input module, a first conversion module, and a first output module. The first input module is electrically connected to the first conversion module, and the first conversion module is electrically connected to the first output module. The first input module includes a first input port Vdac1, a third resistor R3, a fifth resistor R5, and a sixth resistor R6. One end of the first input port Vdac1 is connected to one end of the sixth resistor R6. The other end of the sixth resistor R6 is connected to one end of the third resistor R3 and one end of the fifth resistor R5. The other end of the fifth resistor R5 is grounded. The other end of the third resistor R3 is connected to the output module, and the other end of the sixth resistor R6 is also connected to the first conversion module. The first conversion module includes a first inductor L1, a first capacitor C1, a first resistor R1, and a first conversion chip U1. One interface of the first inductor L1 is connected to the voltage source VN. The other interface of the first inductor L1 is simultaneously connected to the positive plate of the first capacitor C1 and the first pin 1 of the first conversion chip U1. The negative plate of the first capacitor C1 is grounded. The fourth pin 4 of the first conversion chip U1 is connected to one end of the first resistor R1. The other interface of the first resistor R1 is grounded. The second pin 2 of the first conversion chip U1 is connected to the first output module. The third pin 3 of the first conversion chip U1 is connected to the sixth resistor R6. The other pins of the first conversion chip U1 are grounded. The first output module includes a first energy storage circuit, a third capacitor C3, and a first output interface +Vout. The first energy storage circuit includes a second inductor L2, a second capacitor C2, and a first diode D1. The second inductor L2, the second capacitor C2, and the first diode D1 form a closed loop. The negative plate of the second capacitor C2 is grounded. One end of the second inductor L2 is also connected to the second pin 2 of the first conversion chip U1. The other end of the second inductor L2 is also connected to the first output interface +Vout and the third resistor R3. The first end of the first output interface +Vout is connected to one pin of the third capacitor C3. The other pin of the third capacitor C3 is grounded.

[0024] In this embodiment, the negative power supply output circuit includes a second input module, a second conversion module, and a second output module. The second input module is electrically connected to the second conversion module, and the second conversion module is electrically connected to the second output module. The second input module includes a second input port Vdac2, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. One end of the eleventh resistor R11 is connected to the second input port Vdac2, and the other end of the eleventh resistor R11 is connected to one end of the ninth resistor R9 and one end of the tenth resistor R10. The other end of the ninth resistor R9 is grounded, the other end of the tenth resistor R10 is connected to the second output module, and the other end of the eleventh resistor R11 is also connected to the second conversion module. The second conversion module includes a third inductor L3, a fourth inductor L4, a fourth capacitor C4, a seventh capacitor C7, and a second conversion chip U2. One interface of the third inductor L3 is connected to the voltage source VN, and the other interface of the third inductor L3 is simultaneously connected to the positive plate of the fourth capacitor C4 and the first pin 1 of the second conversion chip U2. The negative plate of the fourth capacitor C4 is grounded. The fourth pin 4 of the second conversion chip U2 is connected to one pin of the seventh capacitor C7, and the other pin of the seventh capacitor C7 is grounded. The fourth pin 4 of the second conversion chip U2 is also connected to the second output module. The second pin 2 of the second conversion chip U2 is connected to one end of the fourth inductor L4, the other end of the fourth inductor L4 is grounded, and the second pin 2 of the second conversion chip U2 is also connected to the second output module. The other pins of the second conversion chip are connected to the second output module. The second output module includes a second diode D2, a fifth capacitor C5, a sixth capacitor C6, and a second output interface -Vout. The negative electrode of the second diode D2 is connected to the second pin 2 of the second conversion chip U2, the positive electrode of the second diode D2 is connected to the second output interface -Vout, the second output interface -Vout is connected to the fourth pin 4 of the second conversion chip U2, the negative plate of the fifth capacitor C5 is connected to one end of the tenth resistor R10 and the second output interface -Vout, and the positive plate of the fifth capacitor C5 is grounded. One pin of the sixth capacitor C6 is connected to the second output interface -Vout, and the other pin of the sixth capacitor C6 is grounded.

[0025] The digital-to-analog conversion circuit in this embodiment is an inverted-T resistor network circuit, which is 12-bit. Of course, it can also be larger than 12-bit, such as 16-bit. The third capacitor C3, the sixth capacitor C6, and the seventh capacitor C7 are all ceramic capacitors. The "connection" mentioned in this embodiment all refers to electrical connection, and the electrical connection in this embodiment is all wire connection and connection. The models of the first and second conversion chips are FS1061. Of course, they can also be other types of DC-DC conversion chips. At the same time, the first, second, third, and fourth pins of the first and second conversion chips are the VIN pin, SB pin, FB pin, and EN pin respectively. The first output interface +Vout outputs the signal to the VPOS terminal, and the second output interface -Vout outputs the signal to the VNEG terminal.

[0026] Of course, the digital-to-analog conversion circuit can also use a digital-to-analog conversion circuit with a weighted resistor network, as long as it is 12 bits or more.

[0027] In summary, although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ink screen color control circuit structure, including a data memory, Characterized in that; It also includes a digital-to-analog conversion circuit and a DC-DC conversion circuit; the number of bits of the digital-to-analog conversion circuit is at least 12 bits, and the digital-to-analog conversion circuit is used to perform digital-to-analog conversion on the signal output by the data memory and provide an input voltage to the DC-DC conversion circuit. The DC-DC conversion circuit includes a positive power supply output circuit and a negative power supply output circuit; the positive power supply output circuit transmits the output signal to the high voltage end of the ink screen color control, and the negative power supply output circuit transmits the signal to the low voltage end of the ink screen color control; the positive power supply output circuit includes a first input module, a first conversion module and a first output module, the first input module is electrically connected to the first conversion module, and the first conversion module is electrically connected to the first output module; the negative power supply output circuit includes a second input module, a second conversion module and a second output module, the second input module is electrically connected to the second conversion module, and the second conversion module is electrically connected to the second output module; the number of digital-to-analog conversion circuits is 8, and the number of positive power supply output circuits and negative power supply output circuits are 4 respectively; each set of positive and negative power supply output circuits controls one kind of original color particle, and one digital-to-analog conversion circuit outputs the signal to one DC-DC conversion circuit.

2. The ink screen color control circuit structure according to claim 1, Characterized in that: The first input module includes a first input port Vdac1, a third resistor R3, a fifth resistor R5 and a sixth resistor R6. The first input port Vdac1 is electrically connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is simultaneously electrically connected to one end of the third resistor R3 and one end of the fifth resistor R5. The other end of the fifth resistor R5 is grounded, and the other end of the third resistor R3 is electrically connected to the output module. The other end of the sixth resistor R6 is also electrically connected to the first conversion module.

3. The ink screen color control circuit structure according to claim 2, Characterized in that: The first conversion module includes a first inductor L1, a first capacitor C1, a first resistor R1 and a first conversion chip U1. One end of the first inductor L1 is electrically connected to an external voltage source, and the other end of the first inductor L1 is simultaneously electrically connected to the positive electrode plate of the first capacitor C1 and the first pin of the first conversion chip U1. The negative electrode plate of the first capacitor C1 is grounded. The fourth pin of the first conversion chip U1 is electrically connected to one end of the first resistor R1, and the other end of the first resistor R1 is grounded. The second pin of the first conversion chip U1 is electrically connected to the first output module. The third pin of the first conversion chip U1 is electrically connected to one end of the sixth resistor R6, and other pins of the first conversion chip U1 are grounded.

4. The ink screen color control circuit structure according to claim 3, Characterized in that: The first output module includes a first energy storage circuit, a third capacitor C3, and a first output interface +Vout. The first energy storage circuit includes a second inductor L2, a second capacitor C2, and a first diode D1. The second inductor L2, the second capacitor C2, and the first diode D1 are electrically connected to form a closed loop. The negative plate of the second capacitor C2 is grounded. One end of the second inductor L2 is also electrically connected to the second pin of the first conversion chip U1. The other end of the second inductor is simultaneously electrically connected to the first end of the first output interface +Vout and one end of the third resistor R3. The first end of the first output interface +Vout is electrically connected to one pin of the third capacitor C3. The other pin of the third capacitor C3 is grounded. The second end of the first output interface +Vout is electrically connected to the high voltage end of the ink screen color control.

5. The ink screen color control circuit structure according to claim 1, characterized in that: The second input module includes a second input port Vdac2, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11. The second input port Vdac2 is electrically connected to one end of the eleventh resistor R11. The other end of the eleventh resistor R11 is simultaneously electrically connected to the second conversion module, one end of the ninth resistor R9, and one end of the tenth resistor R10. The other end of the ninth resistor R9 is grounded. The other end of the tenth resistor R10 is electrically connected to the second output module.

6. The ink screen color control circuit structure according to claim 5, characterized in that: The second conversion module includes a third inductor L3, a fourth inductor L4, a fourth capacitor C4, a seventh capacitor C7, and a second conversion chip U2. One end of the third inductor L3 is electrically connected to an external voltage source. The other end of the third inductor L3 is simultaneously electrically connected to the positive plate of the fourth capacitor C4 and the first pin of the second conversion chip U2. The negative plate of the fourth capacitor C4 is grounded. The fourth pin of the second conversion chip U2 is electrically connected to one pin of the seventh capacitor C7. The other pin of the seventh capacitor C7 is grounded. The fourth pin of the second conversion chip U2 is also electrically connected to the second output module. The second pin of the second conversion chip U2 is electrically connected to one end of the fourth inductor L4. The other end of the fourth inductor L4 is grounded. The second pin of the second conversion chip U2 is also electrically connected to the second output module. The other pins of the second conversion chip U2 are electrically connected to the second output module.

7. The ink screen color control circuit structure according to claim 6, characterized in that: The second output module includes a second diode D2, a fifth capacitor C5, a sixth capacitor C6, and a second output interface -Vout. The negative electrode of the second diode D2 is electrically connected to the second pin of the second conversion chip U2. The positive electrode of the second diode D2 is electrically connected to the first end of the second output interface -Vout. The first end of the second output interface -Vout is electrically connected to the fourth pin of the second conversion chip U2. The negative electrode plate of the fifth capacitor C5 is simultaneously electrically connected to one end of the tenth resistor R10 and the first end of the second output interface -Vout. The positive electrode plate of the fifth capacitor C5 is grounded. One pin of the sixth capacitor C6 is electrically connected to the first end of the second output interface -Vout. The first end of the second output interface -Vout is electrically connected to the low voltage end of the ink screen color control. The other pin of the sixth capacitor C6 is grounded.

8. The ink screen color control circuit structure according to claim 1, characterized in that: The digital-to-analog conversion circuit is an inverted T-shaped resistor network circuit.

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