CN106297677A - Source electrode driving circuit and electrophoretic display - Google Patents

Abstract

The invention discloses a source electrode driving circuit and an electrophoretic display, wherein the source electrode driving circuit comprises a level conversion module, a level conversion module and a control module, wherein the level conversion module is used for receiving an input signal to generate a control signal; and an output module coupled to the level conversion module for receiving the control signal to provide a first voltage, a second voltage or a third voltage.

Description

Source drive circuit and electrophoretic display

technical field

The present invention relates to a source driving circuit, in particular to a source driving circuit with simplified design to provide three source voltages to drive an electrophoretic display.

Background technique

With the rapid development of electronic mobile devices, the development of products that emphasize thinner and lighter or energy-saving and carbon-reducing products is carried out in a continuous manner. Among them, for electrophoretic display technology (also referred to as electronic paper or electrophoretic display), in order to pursue the purpose of portable products and reduce power consumption, the design of related electronic driving circuits has become one of the hot topics.

Please refer to FIG. 1 , which is a schematic diagram of a source driving circuit 10 used to drive an electrophoretic display in the prior art. In order to cooperate with the display technology of the electrophoretic display, the traditional source drive circuit 10 needs to provide a high-level voltage, a low-level voltage or a ground voltage to drive related operations. As shown in FIG. 1 , the source drive circuit 10 includes a A level conversion module 100 , an output module 102 and a temporary storage and judgment module 104 . Preferably, the level conversion module 100 is coupled between the output module 102 and the temporary storage and judgment module 104, the level conversion module 100 includes three level conversion units 1000, 1002, 1004, and each level conversion unit Both are driven by a full-amplitude voltage source and coupled to an intermediate terminal of the temporary storage and determination module 104 . In addition, the temporary storage and judging module 104 correspondingly generates different digital signal combinations according to an input signal A0, A1, such as two-bit digital signals such as 00, 01, 10, and 11, and correspondingly provides them to a plurality of intermediate endpoints to make the level Received by conversion units 1000, 1002, 1004. Accordingly, the level conversion units 1000, 1002, and 1004 driven by the full-amplitude voltage source can correspond to the conduction of the three transistor switches 1020, 1022, and 1024 of the output module 102, and correspond to the high voltage generated by an output terminal SO. The display operation of the source driving circuit 10 is driven by a flat voltage, a low level voltage or a ground voltage.

However, the source driving circuit 10 used in the conventional technology must use a large number of level conversion units, which will cause the final design of the source driving circuit 10 to occupy a larger layout area, and the corresponding power consumption cannot be effective reduction. In this case, it has become an important subject in this field to provide a circuit design to simplify the existing source driving circuit 10 so as to meet the product design concept of thin and light design and low power consumption.

Contents of the invention

Therefore, the main purpose of the present invention is to provide a source driving circuit with simplified design to drive the display operation of the electrophoretic display.

The invention discloses a source driving circuit for driving an electrophoretic display. The source driving circuit includes a level conversion module for receiving an input signal to generate a control signal; and an output module coupled to the The level conversion module receives the control signal to provide a high level voltage, a low level voltage or a ground voltage correspondingly to drive a display operation of the electrophoretic display.

The present invention also discloses an electrophoretic display, which includes a display panel; a processing module, coupled to the display panel, for generating a driving signal; and a source driving circuit, coupled to the display panel and the processing module, for The display panel is correspondingly driven according to the driving signal, wherein the source driving circuit further includes a level conversion module for receiving an input signal to generate a control signal; and an output module coupled for receiving the control signal The signal is used to correspondingly provide a high-level voltage, a low-level voltage or a ground voltage to drive a display operation of the electrophoretic display.

Description of drawings

FIG. 1 is a schematic diagram of a source driver circuit 10 for driving an electrophoretic display in the prior art.

FIG. 2 is a schematic diagram of an electrophoretic display according to an embodiment of the present invention.

3-11 are detailed schematic diagrams of different source driving circuits in the embodiments of the present invention.

Wherein, the reference signs are explained as follows:

1, 2 Electrophoretic display

10, 20, 30, 40, 50, 60, 70, 80, source drive circuit

90, 11, 21

100, 200, 300, 110 level shifting modules

102, 202, 302, 402, 502, 602, 702, output module

802, 902, 130, 230

104, 204, 150 temporary storage and judgment module

1000, 1002, 1004 level translation units

2000, 3000, 1100, 2100 first level conversion unit

2002, 3002, 1102, 2102 second level conversion unit

1104 Third level conversion unit

1020, 1022, 1024, 9020_M1, Transistor

9020_M2, 9022_M1, 9022_M2, 1300,

1302, 1304, 2300, 2302, 2304,

2500_M1, 2500_M2, 2500_M3,

2500_M4, 2502_M1, 2502_M2

22 Gate drive circuit

24 display panel

250 transport modules

2500, 2502 Transport Module Units

3020, 4020, 5020, 6020, 7020, 8020, the first output unit

9020

3022, 4022, 5022, 6022, 7022, 8022, second output unit

9022

A0, A1, DI0, DI1 input signal

D0, D0B, D1, D1B control signals

VGH positive voltage

VDD regulated voltage source

GND ground voltage

VGL negative voltage

VSH High state signal

VSL Low state signal

SO output endpoint

detailed description

Certain terms are used in the specification and subsequent claims to refer to particular components. Those of ordinary skill in the art will appreciate that manufacturers may refer to the same component by different terms. This description and subsequent patent applications do not use the difference in name as a way to distinguish components, but use the difference in function of components as a basis for distinction. "Includes" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the word "connect" herein includes any direct and indirect means of electrical connection. Therefore, if it is described in the text that a first device is connected to a second device, it means that the first device can be directly connected to the second device, or indirectly connected to the second device through other devices or connection means.

Please refer to FIG. 2 , which is a schematic diagram of an electrophoretic display 2 (ie, an electronic paper display) according to an embodiment of the present invention. As shown in FIG. 2 , the electrophoretic display 2 of this embodiment includes a source driving circuit 20 , a gate driving circuit 22 and a display panel 24 . The source driving circuit 20 and the gate driving circuit 22 are coupled to the display panel 24 , and each generates a driving signal to the display panel 24 to drive it to work. Wherein, the source driving circuit 20 can output a first voltage, a second voltage or a third voltage to drive the display panel 24, and the gate driving voltage 22 generates a driving signal such as a gate voltage to activate the electrophoretic display 2. One display works. Preferably, the source driving circuit 20 in this embodiment includes a level conversion module 200 , an output module 202 and a temporary storage and judgment module 204 . The level conversion module 200 is coupled between the output module 202 and the temporary storage and judgment module 204, and includes a first level conversion unit 2000 and a second level conversion unit 2002, and each level conversion unit utilizes half For example, the first level conversion unit 2000 can be driven by a positive voltage VGH and a ground voltage GND, and the second level conversion unit 2002 can be driven by a stable voltage source VDD and a negative voltage VGL. drive. In addition, the first voltage output by the source driving circuit 20 in this embodiment is a high-level voltage, the second voltage is a low-level voltage, and the third voltage is a ground voltage, which are not intended to limit the scope of the present invention.

In addition, the temporary storage and judging module 204 in this embodiment can generate input signals DI0 and DI1 of a two-bit transmission data to the level conversion module 200, and the two-bit transmission data can represent a high level state and a low level state, a ground state or an error detection state, wherein the high level state can control the source driving circuit 20 to output the first voltage (such as a high level voltage), and the low level state can control the source driving circuit 20 to output the first voltage Two voltages (such as a low level voltage), and the ground state can control the source driving circuit 20 to output a third voltage (such as a ground voltage GND). For example, the input data 00, 01, 10, 11 may respectively represent the ground state, the high level state, the low level state and the error detection state, but not limited thereto. In addition, the temporary storage and judging module 204 in this embodiment may also include an error detection module. When the temporary storage and judgment module 204 generates an input signal that is in an error detection state (for example, input data 11), the error detection module may switch the corresponding detection The fault state is grounded to prevent the default signal of the fault detection state from being generated, which also belongs to the scope of the present invention.

Accordingly, the temporary storage and judging module 204 can generate different input signals (such as input data 00, 01, 10 or 11) to the level conversion module 200, so that the level conversion module 200 can output a control signal to the output module 202, And let the output module 204 correspondingly output the first voltage, the second voltage or the third voltage to the display panel 24 , and then start the display operation of the electrophoretic display 2 . Accordingly, compared with the circuit design of the source driver circuit 10 provided by the known technology, the simplified circuit of the level conversion module 200 in this embodiment only needs to use a half-amplitude voltage source to perform each level conversion unit In addition, the number of level conversion units used in the level conversion module 200 can also be greatly reduced, so that the product of the electrophoretic display 2 can meet the product design of thin and light design and low power consumption.

Please refer to FIG. 3 , which is a detailed schematic diagram of a source driving circuit 30 according to Embodiment 1 of the present invention. In order to simplify the description, the source drive circuit 30 in FIG. 3 omits the illustration of the temporary storage and judgment module, but only includes a level conversion module 300 and an output module 302, and the input signal generated by the temporary storage and judgment module DI0 and DI1 are used for illustration, and the input signals DI0 and DI1 can be transmitted to the level conversion module 300 . As shown in Figure 3, the level shifting module 300 in this embodiment includes a first level shifting unit 3000 and a second level shifting unit 3002, which respectively receive the input signals DI0, DI0, and DI1, at the same time, the first level conversion unit 3000 and the second level conversion unit 3002 can be driven by a half-amplitude voltage source (that is, the first level conversion unit 3000 can be driven by a positive voltage VGH and a ground voltage GND, and The second level conversion unit 3002 can be driven by a stable voltage source VDD and a negative voltage VGL). In addition, the output module 302 in this embodiment includes a first output unit 3020 and a second output unit 3022, wherein the first output unit 3020 and the second output unit 3022 are inverters, and the first output unit 3020 and The second output unit 3022 is respectively coupled to the first level conversion unit 3000 and the second level conversion unit 3002 . Accordingly, the first level shifting unit 3000 and the second level shifting unit 3002 can generate control signals D0, D0B, D1, D1B according to the input signals DI0, DI1, wherein D0B is the inverse signal of D0, and D1B is D1 The inverse signal of , and the control signal D0B is transmitted to the first output unit 3020 , and the control signal D1 is transmitted to the second output unit 3022 . In addition, the first output unit 3020 can output one of a high-level state signal VSH or the ground voltage GND as an output signal to the second output unit 3022 according to the control signal D0B. As for the second output unit 3022, it can decide to output the output signal of the first output unit 3020 or a low-level state signal VSL according to the control signal D1, so as to generate an output voltage corresponding to an output terminal SO, and according to the corresponding input signal The value of the two-bit signal changes, and the output voltage provided by the second output unit 3022 can correspond to the first voltage, the second voltage or the third voltage, so as to drive the display operation of the electrophoretic display 2 .

Please refer to FIG. 4 , which is a detailed schematic diagram of a source driving circuit 40 according to Embodiment 2 of the present invention. Similar to the source driving circuit 30 in FIG. 3, the source driving circuit 40 in FIG. The conversion unit 3002 can receive the input signals DI0 and DI1 and be driven by a half-amplitude voltage source, and the output module 402 includes a first output unit 4020 and a second output unit 4022, wherein the first output unit 4020 and the second output The units 4022 are both inverters, and the first level conversion unit 3000 and the second level conversion unit 3002 are respectively coupled to the first output unit 4020 and the second output unit 4022 . The difference from the source driving circuit 30 is that in this embodiment, the second output unit 4022 outputs one of the low-level state signal VSL or the ground voltage GND as an output signal to the first output unit according to the control signal D1 4020, and then the first output unit 4020 determines to output the output signal or the high-level state signal VSH of the second output unit 4022 according to the control signal D0B, so as to generate an output voltage at the output terminal SO, and according to the two corresponding to the input signal The value of the bit signal changes, and the output voltage provided by the first output unit 4020 can correspond to the first voltage, the second voltage or the third voltage, so as to drive the display operation of the electrophoretic display 2 .

Please refer to FIG. 5 , which is a detailed schematic diagram of a source driving circuit 50 according to Embodiment 3 of the present invention. Similar to the source driving circuit 30 in FIG. 3, the source driving circuit 50 in FIG. The conversion unit 3002 can receive the input signals DI0 and DI1, and is driven by a half-amplitude voltage source, and the output module 502 includes a first output unit 5020 and a second output unit 5022, but the difference is that in this embodiment The first output unit 5020 and the second output unit 5022 are respectively a buffer. Accordingly, the first level shifting unit 3000 and the second level shifting unit 3002 are respectively coupled to the first output unit 5020 and the second output unit 5022. Further, in this embodiment, the first output unit 5020 according to the control signal D0, Output one of the high-level state signal VSH or the ground voltage GND as an output signal to the second output unit 5022, and then the second output unit 5022 determines whether to output the output signal of the first output unit 5020 or the low level according to the control signal D1B. The level state signal VSL is used to generate an output voltage at the output terminal SO, and according to the change of the value of the two-bit signal corresponding to the input signal, the output voltage provided by the second output unit 5022 can correspond to the first voltage and the second voltage or the third voltage to drive the display work of the electrophoretic display 2 .

Please refer to FIG. 6 , which is a detailed schematic diagram of a source driving circuit 60 according to Embodiment 4 of the present invention. Similar to the source driving circuit 30 in FIG. 3, the source driving circuit 60 in FIG. The conversion unit 3002 can receive the input signals DI0 and DI1, and is driven by a half-amplitude voltage source, and the output module 602 includes a first output unit 6020 and a second output unit 6022, but the difference is that in this embodiment The first output unit 6020 and the second output unit 6022 are respectively a buffer. Accordingly, the first level conversion unit 3000 and the second level conversion unit 3002 are respectively coupled to the first output unit 6020 and a second output unit 6022. Further, in this embodiment, the second output unit 6022 will output one of the low-level state signal VSL or the ground voltage GND as an output signal to the first output unit 6020, and then the first output unit 6020 decides to output the output signal of the second output unit 6022 or The high-level state signal VSH is used to generate an output voltage at the output terminal SO, and according to the change of the value of the two-bit signal corresponding to the input signal, the output voltage provided by the first output unit 6020 can correspond to the first voltage, the second voltage or the third voltage to drive the display work of the electrophoretic display 2 .

Please refer to FIG. 7 , which is a detailed schematic diagram of a source driving circuit 70 according to Embodiment 5 of the present invention. Similar to the source driving circuit 30 in FIG. 3, the source driving circuit 70 in FIG. The conversion unit 3002 can receive the input signals DI0 and DI1, and is driven by a half-amplitude voltage source, and the output module 702 includes a first output unit 7020 and a second output unit 7022, but the difference is that the first output unit 7020 is a buffer, and the second output unit 7022 is an inverter. Accordingly, the first level conversion unit 3000 and the second level conversion unit 3002 are respectively coupled to the first output unit 7020 and the second output unit 7022. Further, in this embodiment, the second output unit 7022 will use the control signal D1, Output one of the low-level state signal VSL or the ground voltage GND as an output signal to the first output unit 7020, and then the first output unit 7020 decides to output the output signal of the second output unit 7022 or the high The level state signal VSH is used to generate an output voltage at the output terminal SO, and according to the change of the value of the two-bit signal corresponding to the input signal, the output voltage provided by the first output unit 7020 can correspond to the first voltage and the second voltage or the third voltage to drive the display work of the electrophoretic display 2 .

Please refer to FIG. 8 , which is a detailed schematic diagram of a source driving circuit 80 according to Embodiment 6 of the present invention. Similar to the source driving circuit 30 in FIG. 3, the source driving circuit 80 in FIG. The conversion unit 3002 can receive input signals DI0 and DI1, and is driven by a half-amplitude voltage source, and the output module 802 includes a first output unit 8020 and a second output unit 8022, but the difference is that the first output unit 8020 is an inverter, and the second output unit 8022 is a buffer. Accordingly, the first level shifting unit 3000 and the second level shifting unit 3002 are respectively coupled to the first output unit 8020 and the second output unit 8022. Further, in this embodiment, the second output unit 8022 according to the control signal D1B, Output one of the low-level state signal VSL or the ground voltage GND as an output signal to the first output unit 8020, and then the first output unit 8020 decides to output the output signal of the second output unit 8022 or the high The level state signal VSH is used to generate an output voltage at the output terminal SO, and according to the change of the value of the two-bit signal corresponding to the input signal, the output voltage provided by the first output unit 8020 can correspond to the first voltage and the second voltage or the third voltage to drive the display work of the electrophoretic display 2 .

Please refer to FIG. 9 , which is a detailed schematic diagram of a source driving circuit 90 according to Embodiment 7 of the present invention. Similar to the source driving circuit 30 in FIG. 3, the source driving circuit 90 in FIG. The conversion unit 3002 can receive input signals DI0 and DI1, and is driven by a half-amplitude voltage source, and the output module 902 includes a first output unit 9020 and a second output unit 9022, wherein the first output unit 9020 is an inverter And includes two transistors 9020_M1, 9020_M2, and the second output unit 9022 includes two transistors 9022_M1, 9022_M2. Accordingly, a gate of the transistor 9020_M1 and a gate of the transistor 9020_M2 in the first output unit 9020 are mutually coupled to the first level conversion unit 3000 to receive the control signal DOB, and a drain of the transistor 9020_M1 and a gate of the transistor 9020_M2 The drains are coupled to an output terminal SO, and a source of the transistor 9020_M1 is coupled to the high state signal VSH. In addition, a gate of the transistor 9022_M1 in the second output unit 9022 is coupled to the second level conversion unit 3002 to receive the control signal D1, a source of the transistor 9022_M1 receives the ground voltage GND, and a gate of the transistor 9022_M2 is coupled to The second level conversion unit 3002 is used to receive the control signal D1B, a drain of the transistor 9022_M1 and a source of the transistor 9022_M2 are coupled to a source of the transistor 9020_M2, and a drain of the transistor 9022_M2 is coupled to a low level According to the state signal VSL, according to the value change of the two-bit signal corresponding to the input signal, the output terminal SO can provide the first voltage, the second voltage or the third voltage to drive the display operation of the electrophoretic display 2 .

In short, the above embodiments have shown that the output module can be implemented by inverters, buffers, or multiple transistor components corresponding to different coupling relationships, and driven by half-amplitude voltage sources with two conversion module units, this implementation For example, the first voltage, the second voltage or the third voltage can be correspondingly provided to drive the display operation of the electrophoretic display 2 , and the electrophoretic display 2 can meet the product design of thin and light design and low power consumption. Of course, those skilled in the art can refer to the connection relationship and component composition of the above embodiments, and combine these embodiments with corresponding replacement or modification, or appropriately change the working means such as the type of transistor, input signal, control signal, etc., to output the same The first voltage, the second voltage or the third voltage to drive the electrophoretic display 2 is not intended to limit the scope of the present invention.

Please refer to FIG. 10 , which is a detailed schematic diagram of the source driving circuit 11 according to the eighth embodiment of the present invention. As shown in FIG. 10 , the source driving circuit 11 includes a level conversion module 110 , an output module 130 and a temporary storage and judgment module 150 . Preferably, the level conversion module 110 in this embodiment includes a first level conversion unit 1100, a second level conversion unit 1102 and a third level conversion unit 1104, and at the same time, the first level conversion unit 1100, the second level conversion unit 1102 and the third level conversion unit 1104 can be driven by a half-amplitude voltage source (that is, the first level conversion unit 1100 can be driven by the positive voltage VGH and the ground voltage GND, while the second The level conversion unit 1102 and the third level conversion unit 1104 can be driven by the stable voltage source VDD and the negative voltage VGL), and the output module 130 includes three transistors 1300, 1302, 1304, and the temporary storage and judgment module is coupled to the first A level conversion unit 1100, a second level conversion unit 1102 and a third level conversion unit 1104, and generate input signals to the first level conversion unit 1100, the second level conversion unit 1102 and the third level conversion unit 1104. In addition, in the output module 1300, a gate of the transistor 1300 is coupled to the first level conversion unit 1100 to receive the control signal, a source of the transistor 1300 receives the high-level state signal VSH, and a source of the transistor 1302 receives the high-level state signal VSH. The gate of the transistor 1304 is coupled to the third level conversion unit 1104 to receive the control signal. signal, a source of the transistor 1304 receives the ground voltage GND, and a drain of the transistor 1300, a drain of the transistor 1302 and a drain of the transistor 1304 are coupled with each other to form an output terminal SO, and according to the corresponding input signal The value of the two-bit signal changes, and the output terminal SO can provide the first voltage, the second voltage or the third voltage to drive the display operation of the electrophoretic display 2 .

In other words, the embodiment of FIG. 10 can also use three level conversion units to receive input signals, and turn on multiple transistors in the output module according to different control commands generated, so as to start the display operation of the electrophoretic display 2 . Of course, those skilled in the art can also refer to the connection relationship and component composition of the above embodiments, and combine these embodiments with corresponding replacement or modification, or appropriately change the working methods such as the type of transistor, input signal, control signal, etc., to output the same The first voltage, the second voltage or the third voltage to drive the electrophoretic display 2 is not intended to limit the scope of the present invention.

Please refer to FIG. 11 , which is a detailed schematic diagram of the source driving circuit 21 according to Embodiment 9 of the present invention. As shown in FIG. 11 , the source driving circuit 21 includes a level conversion module 210 , an output module 230 and a transmission module 250 . Preferably, the level conversion module 210 in this embodiment includes a first level conversion unit 2100 and a second level conversion unit 2102, and the first level conversion unit 2100 and the second level conversion unit 2102 can be Drive with a full swing voltage source. The output module 230 includes three transistors 2300, 2302, 2304, and the transmission module includes a first transmission unit 2500 and a second transmission unit 2502, wherein the output module 230 is coupled between the first transmission unit 2500 and the second transmission unit 2502 Between, and the first transmission unit 2500 includes four transistors 2500_M1, 2500_M2, 2500_M3, 2500_M4, and the second transmission unit 2502 includes two transistors 2502_M1, 2502_M2. Further, the first level conversion unit 2100 and the second level conversion unit 2102 generate control signals D0, D0B, D1, D1B to the first transmission unit 2500 and the second transmission unit 2502 according to the input signal, wherein one of the transistors 2500_M1 The gate is coupled to the second level conversion unit 2102 to receive the control signal D1B, a source of the transistor 2500_M1 receives the positive voltage VGH, a drain of the transistor 2500_M1 and a source of the transistor 2500_M2 are mutually coupled to a side of the transistor 2300 Gate, a drain of the transistor 2500_M2 is coupled to the first level conversion unit 2100 to receive the control signal D0B, a gate of the transistor 2500_M2 and a gate of the transistor 2500_M3 are coupled to each other to receive the control signal D1, the transistor 2500_M3 A source is coupled to the first level conversion unit 2100 to receive the control signal D0B, a drain of the transistor 2500_M3 and a drain of the transistor 2500_M4 are mutually coupled to a gate of the transistor 2302, and a gate of the transistor 2500_M4 is coupled to Connected to the second level conversion unit 2102 to receive the control signal D1B, a source of the transistor 2500_M4 receives the negative voltage VGL, a gate of the transistor 2502_M1 and a gate of the transistor 2502_M2 are mutually coupled to the second level conversion unit 2101 To receive the control signal D1, a source of the transistor 2502_M1 is coupled to the first level conversion unit 2100 to receive the control signal D0B, a drain of the transistor 2502_M1 and a drain of the transistor 2502_M2 are mutually coupled to a gate of the transistor 2304 A source of the transistor 2502_M2 receives the negative voltage VGL, a drain of the transistor 2300, a drain of the transistor 2302 and a drain of the transistor 2304 are mutually coupled to form an output terminal SO, and a source of the transistor 2300 receives The high state signal VSH, a source of the transistor 2302 receives the low state signal VSL, and a source of the transistor 2304 receives the ground voltage GND. Accordingly, by changing the value of the two-bit signal corresponding to the input signal, the output terminal SO can correspondingly provide the first voltage, the second voltage or the third voltage to drive the display operation of the electrophoretic display 2 .

Therefore, the embodiment of FIG. 11 uses two level conversion units to receive the input signal, and turn on multiple transistors in the transmission module and the output module according to the generated different control commands, so as to start the display operation of the electrophoretic display 2 . Of course, those skilled in the art can also refer to the connection relationship and component composition of the above embodiments, and combine these embodiments with corresponding replacement or modification, or appropriately change the working methods such as the type of transistor, input signal, control signal, etc., to output the same The first voltage, the second voltage or the third voltage to drive the electrophoretic display 2 is not intended to limit the scope of the present invention.

To sum up, the level conversion module provided by this embodiment can include multiple level conversion units, and according to the set temporary storage and judgment module and the input signal generated, the level conversion unit will correspondingly generate different The control signal is sent to the transmission module and the output module to correspondingly turn on different transistors in the transmission module and the output module, and then output the first voltage (such as a high-level voltage), the second voltage (such as a low-level voltage) or the third voltage ( Such as a ground voltage) to drive the display work of the electrophoretic display 2 . Compared with the known technology, this embodiment greatly reduces the number of transistors included in the source drive circuit through appropriate components and related circuit design, so that the electrophoretic display can meet the thin and light design. At the same time, this embodiment also uses half-amplitude voltage The drive mode of the source can also meet the efficacy of low power and simplified circuit, thereby improving the application range and product expandability of the electrophoretic display.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (14)

1. a source electrode drive circuit, it is characterised in that include:

One level switch module, is used for receiving an input signal, to produce a control signal；And

One output module, couples this level switch module to receive this control signal, provides one the with correspondence One voltage, one second voltage or a tertiary voltage.

2. source electrode drive circuit as claimed in claim 1, it is characterised in that this level switch module comprises There are one first level conversion unit and a second electrical level converting unit, and this first level conversion list Unit utilizes half amplitude voltage source to drive with this second electrical level converting unit.

3. source electrode drive circuit as claimed in claim 2, it is characterised in that this output module includes First output unit and one second output unit, and this first output unit and this second output Unit is respectively a phase inverter, to allow this first output unit be coupled to this first level conversion unit Receiving this control signal, this second output unit is coupled to this second electrical level converting unit and receives This control signal, and the output of this first output unit one outputs signal to this second output unit, makes Obtain this second output unit according to this control signal and this output signal, this first electricity of correspondence offer Pressure, this second voltage or this tertiary voltage.

4. source electrode drive circuit as claimed in claim 2, it is characterised in that this output module includes First output unit and one second output unit, and this first output unit and this second output Unit is all a phase inverter, to allow this first output unit be coupled to this first level conversion unit Receiving this control signal, this second output unit is coupled to this second electrical level converting unit and receives this Control signal, and the output of this second output unit one outputs signal to this first output unit so that This first output unit according to this control signal and this output signal, corresponding provide this first voltage, This second voltage or this tertiary voltage.

5. source electrode drive circuit as claimed in claim 2, it is characterised in that this output module includes First output unit and one second output unit, and this first output unit and this second output Unit is all a buffer, to allow this first output unit be coupled to this first level conversion unit Receiving this control signal, this second output unit is coupled to this second electrical level converting unit and receives this Control signal, and the output of this first output unit one outputs signal to this second output unit so that This second output unit according to this control signal and this output signal, corresponding provide this first voltage, This second voltage or this tertiary voltage.

6. source electrode drive circuit as claimed in claim 2, it is characterised in that this output module includes First output unit and one second output unit, and this first output unit and this second output Unit is all a buffer, to allow this first output unit be coupled to this first level conversion unit Receiving this control signal, this second output unit is coupled to this second electrical level converting unit and receives this Control signal, and the output of this second output unit one outputs signal to this first output unit so that This first output unit according to this control signal and this output signal, corresponding provide this first voltage, This second voltage or this tertiary voltage.

7. source electrode drive circuit as claimed in claim 2, it is characterised in that this output module includes First output unit and one second output unit, this first output unit be a buffer and this Two output units are a phase inverter, to allow this first output unit be coupled to this first level conversion list Unit receives this control signal, and this second output unit is coupled to this second electrical level converting unit and connects Receive this control signal, and this second output unit output one output signal to this first output unit, Make this first output unit according to this control signal and this output signal, corresponding provide this first Voltage, this second voltage or this tertiary voltage.

8. source electrode drive circuit as claimed in claim 2, it is characterised in that this output module includes First output unit and one second output unit, this first output unit be a phase inverter and this Two output units are a buffer, to allow this first output unit be coupled to this first level conversion list Unit receives this control signal, and this second output unit is coupled to this second electrical level converting unit and connects Receive this control signal, and this second output unit output one output signal to this first output unit, Make this first output unit according to this control signal and this output signal, corresponding provide this first Voltage, this second voltage or this tertiary voltage.

9. source electrode drive circuit as claimed in claim 2, it is characterised in that this output module includes First output unit and one second output unit, this first output unit is a phase inverter and comprises Having a first transistor and a transistor seconds, this second output unit includes one the 3rd crystal Pipe and one the 4th transistor, a grid of this first transistor and a grid of this transistor seconds It is mutually coupled to this first level conversion unit to receive this control signal, the one of this first transistor Drain electrode is mutually coupled to an exit point with a drain electrode of this transistor seconds, this third transistor One grid is coupled to this second electrical level converting unit to receive this control signal, the 4th transistor One grid is coupled to this second electrical level converting unit to receive this control signal, this third transistor One drain electrode is mutually coupled the source electrode to this transistor seconds with a source electrode of the 4th transistor, makes This exit point correspondence provides this first voltage, this second voltage or this tertiary voltage.

10. source electrode drive circuit as claimed in claim 1, it is characterised in that this level switch module comprises There are one first level conversion unit, a second electrical level converting unit and one the 3rd level conversion unit, And this first level conversion unit, this second electrical level converting unit are sharp with the 3rd level conversion unit Drive with half amplitude voltage source, and this output module include a first transistor, one second Transistor and a third transistor, a grid of this first transistor is coupled to this first level and turns Changing unit to receive this control signal, a grid of this transistor seconds is coupled to this second electrical level and turns Changing unit to receive this control signal, a grid of this third transistor is coupled to the 3rd level and turns Change unit to receive this control signal, and a drain electrode of this first transistor, this transistor seconds One drain electrode of one drain electrode and this third transistor is mutually coupled and forms an exit point so that this is defeated Go out end points correspondence and this first voltage, this second voltage or this tertiary voltage are provided.

11. source electrode drive circuits as claimed in claim 1, it is characterised in that also include a transport module, This level switch module includes one first level conversion unit and a second electrical level converting unit, And this first level conversion unit utilizes a double amplitude voltage source to drive with this second electrical level converting unit Dynamic, this output module includes a first transistor, a transistor seconds and a third transistor, This transport module includes one first transmission unit and one second transmission unit and both are coupled to this electricity Between flat modular converter and this output module, this first transmission unit comprise one the 4th transistor, one 5th transistor, one the 6th transistor AND gate 1 the 7th transistor, this second transmission unit includes one 8th transistor and one the 9th transistor, a grid of the 4th transistor is coupled to this second electricity Flat converting unit receives this control signal, a drain electrode of the 4th transistor and the 5th transistor A source electrode be mutually coupled the grid to this first transistor, the 5th transistor one drain electrode coupling It is connected to this first level conversion unit to receive this control signal, a grid coupling of the 5th transistor Being connected to a grid of the 6th transistor, a source electrode of the 6th transistor is coupled to this first level Converting unit receives this control signal, a drain electrode and the 7th transistor of the 6th transistor One drain electrode is mutually coupled the grid to this transistor seconds, and a grid of the 7th transistor couples Receive this control signal to this second electrical level converting unit, a grid of the 8th transistor with should One grid of the 9th transistor is mutually coupled to this second electrical level converting unit to receive this control letter Number, a source electrode of the 8th transistor is coupled to this first level conversion unit to receive this control letter Number, a drain electrode of the 8th transistor is mutually coupled to the 3rd with a drain electrode of the 9th transistor One grid of transistor, and this first transistor one drain electrode, this transistor seconds one drain electrode with One drain electrode of this third transistor is mutually coupled and forms an exit point so that this exit point pair This first voltage, this second voltage or this tertiary voltage should be provided.

12. source electrode drive circuits as claimed in claim 1, it is characterised in that this level switch module also coupling Connecing one to keep in judge module to receive this input signal, this input signal is one or two bit transfer number According to representing that a high level state, a low level state, a ground voltage or detect wrong state, and When input signal be this detect wrong state time, this is temporary detects mismatch block with judge module also by one and turns Changing this and detecing wrong state is this ground voltage.

13. source electrode drive circuits as claimed in claim 1, it is characterised in that according to this first voltage, be somebody's turn to do Second voltage or this tertiary voltage, drive a display job of an electrophoretic display.

14. 1 kinds of electrophoretic displays, it is characterised in that include:

One display floater；

One gate driver circuit, couples this display floater, is used for producing a driving signal to this display floater； And

One source electrode drive circuit, couples this display floater, includes:

One level switch module, is used for receiving an input signal, to produce a control signal；And

One output module, couples for receiving this control signal, with correspondence provide one first voltage, One second voltage or a tertiary voltage drive a display job of this electrophoretic display.