TWI537915B - Common voltage providing circuit - Google Patents

Description

Common voltage supply circuit

The present invention relates to a control circuit, and more particularly to a common voltage supply circuit.

The existing common voltage supply circuit cooperates with the writing timing of the data voltage, and needs to perform multiple level conversion in one frame time, resulting in high power consumption of the common voltage supply circuit.

In the above case, the writing timing of the data voltage can be matched by controlling the switching of the switching elements by modifying the circuit and using an additional switching element. In this way, it is only necessary to switch once in one frame time to reduce the power consumption of the common voltage supply circuit. However, modifying the circuit will result in a complicated design of the overall wiring, and the additional use of switching elements will also increase the cost of the common voltage supply circuit.

It can be seen that the above existing methods obviously have inconveniences and defects, and need to be improved. In order to solve the above problems, the relevant fields have not tried their best to find a solution, but for a long time, no suitable solution has been developed.

SUMMARY OF THE INVENTION The Summary of the Disclosure is intended to provide a basic understanding of the present disclosure. This Summary is not an extensive overview of the disclosure, and is not intended to be an

It is an object of the present invention to provide a common voltage supply circuit for improving the problems of the prior art.

To achieve the above object, a technical aspect of the present invention relates to a common voltage supply circuit. The common voltage supply circuit includes a first transistor, a second transistor, a third transistor, a first capacitor, a fourth transistor, and a second capacitor. The first transistor, the second transistor, the third transistor, and the fourth transistor each include a first end, a control end, and a control end. The first end of the first transistor is configured to receive the first level signal, and the control end of the first transistor is configured to receive the scan signal. The first end of the second transistor is configured to receive a second level signal, the voltage level of the first level signal is different from the voltage level of the second level signal, and the control end of the second transistor is configured to receive the scan signal. The first end of the third transistor is configured to receive the first common voltage, the control end of the third transistor is coupled to the second end of the first transistor, and the second end of the third transistor is coupled to the output end. The first capacitor is coupled to the control end of the third transistor. The first end of the fourth transistor is configured to receive the second common voltage, the control end of the fourth transistor is coupled to the second end of the second transistor, and the second end of the fourth transistor is coupled to the output end. The second capacitor is coupled to the control end of the fourth transistor.

Therefore, according to the technical content of the present invention, the embodiment of the present invention reduces the common voltage outputted by the common voltage supply circuit by providing a common voltage supply circuit, without increasing the complexity of the circuit wiring and increasing the circuit cost. The number of times to switch, so as to reduce costs and work at the same time The purpose of consumption.

The basic spirit and other objects of the present invention, as well as the technical means and implementations of the present invention, will be readily apparent to those skilled in the art of the invention.

C1~C2‧‧‧ capacitor

Frame1~frame2‧‧‧ frame

G(n), G(n+3)‧‧‧ scan signals

Gnd‧‧‧ Grounding

Output‧‧‧output

During the period of P1~P2‧‧

T1~T4‧‧‧O crystal

V1‧‧‧ first level signal

V2‧‧‧second level signal

Vcom+‧‧‧ first common voltage

Vcom-‧‧‧second common voltage

Vcom(n)‧‧‧ output common voltage

The above and other objects, features, advantages and embodiments of the present invention will become more <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt;

2 is a schematic diagram showing driving waveforms of a common voltage supply circuit according to another embodiment of the present invention.

FIG. 3 is a schematic diagram showing a common voltage supply circuit according to still another embodiment of the present invention.

The various features and elements in the figures are not drawn to scale, and are in the In addition, similar elements/components are referred to by the same or similar element symbols throughout the different drawings.

The description of the embodiments of the present invention is intended to be illustrative and not restrictive. The features of the specific embodiments are covered in the embodiments and are used to construct and operate The method steps of the specific embodiments and their order. However, other specific embodiments may be utilized to achieve the same or equivalent function and sequence of steps.

The scientific and technical terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the invention pertains, unless otherwise defined herein. In addition, the singular noun used in this specification covers the plural of the noun in the case of no conflict with the context; the plural noun of the noun is also included in the plural noun used.

In addition, the term "coupled" as used herein may mean that two or more elements are in direct physical or electrical contact with each other, or indirectly in physical or electrical contact with each other, or that two or more elements are interoperable. Or action.

In order to improve the design of the overall wiring by reducing the power consumption of the common voltage supply circuit, and additionally increasing the cost of the common voltage supply circuit, the present invention proposes a new common voltage supply circuit, as explained later.

FIG. 1 is a schematic diagram showing a common voltage supply circuit according to an embodiment of the invention. As shown, the common voltage supply circuit includes a first transistor T1, a second transistor T2, a third transistor T3, a first capacitor C1, a fourth transistor T4, and a second capacitor C2. Further, each of the first to fourth transistors T1 to T4 includes a first end, a control end, and a second end.

In the connection relationship, the control end of the third transistor T3 is coupled to the second end of the first transistor T1, and the second end of the third transistor T3 is coupled to the output terminal Output. The first capacitor C1 is coupled to the control terminal of the third transistor T3. The control terminal of the fourth transistor T4 is coupled to the second terminal of the second transistor T2, and the second terminal of the fourth transistor T4 is coupled to the output terminal. The second capacitor C2 is coupled to the fourth battery The control end of crystal T4.

In an operational relationship, the first end of the first transistor T1 is configured to receive the first level signal V1, and the control end of the first transistor T1 is configured to receive the scan signal G(n). The first end of the second transistor T2 is configured to receive the second level signal V2. The voltage level of the first level signal V1 is different from the voltage level of the second level signal V2. In addition, the second transistor T2 The control terminal is configured to receive the scan signal G(n). The first end of the third transistor T3 is configured to receive the first common voltage Vcom+. The first end of the fourth transistor T4 is configured to receive the second common voltage Vcom-.

In order to understand the driving mode of the common voltage supply circuit and the manner of providing a common voltage, please refer to FIG. 2, which is a schematic diagram of driving waveforms of a common voltage supply circuit according to another embodiment of the present invention. Referring to FIG. 2, first, before the period P1, the common voltage supply circuit outputs a common voltage Vcom(n) of the high level from its output terminal Output.

Subsequently, during the period P1, the scan signal G(n) is a high level signal, and the first transistor T1 and the second transistor T2 are turned on according to the high level signal. At the same time, the first level signal V1 is a low level signal, and the second level signal V2 is a high level signal, the third transistor T3 is turned off according to the low level signal, and the fourth transistor T4 is according to the high level. The signal is turned on. At this time, the fourth transistor T4 provides the second common voltage Vcom- to the output terminal, and the output terminal Output provides the second common voltage Vcom- of the low level, and maintains the same standard in one frame1. Bit. In other words, the common voltage Vcom(n) outputted by the output terminal is pulled low by the fourth transistor T4 and maintained at a low level within one frame frame1.

Furthermore, please refer to the blank period blanking in FIG. 2, during which the first level signal V1 is converted into a high level signal, and the second level signal is V2 is converted to a low level signal. Next, please refer to the period P2 of FIG. 2, during which the scan signal G(n) is a high level signal, and the first transistor T1 and the second transistor T2 are turned on according to the high level signal. At the same time, the third transistor T3 is turned on according to the first level signal V1 of the high level, and the fourth transistor T4 is turned off according to the second level signal V2 of the low level. At this time, the third transistor T3 provides The first common voltage Vcom+ is output to the output, and the first common voltage Vcom+ of the high level is provided by the output terminal, and the high level is maintained in one frame 2 .

In this way, the common voltage supply circuit of the embodiment of the present invention can provide the required common voltage according to the write timing of the data voltage, and maintain the same level within the same frame time, thereby reducing the number of common voltage switching. And reduce the power consumption of the common voltage supply circuit. In addition, the circuit layout of the common voltage supply circuit of the embodiment of the present invention is simple in design, only requires 4T2C (4 transistors and 2 capacitors), and can reduce the cost of the common voltage supply circuit, and is easy to be on the array. The Gate IC on Array (GOA) circuit is integrated.

The main technical means for solving the problem of the common voltage supply circuit of the embodiment of the present invention has been described above. Only the embodiments implementing the common voltage supply circuit will be described below to make the present invention easier to understand, but the present invention is not implemented in the following. The example is limited to the first.

In an embodiment, referring to FIG. 1, the voltage value of the first common voltage Vcom+ is greater than the voltage value of the second common voltage Vcom-. For example, the voltage value of the first common voltage Vcom+ may be 5V (volts), and the voltage value of the second common voltage Vcom- may be 0V. Accordingly, the data voltage may be 1V~5V. Compared with the general data drive circuit, the data voltage is 1V~5V. And -1V~-5V, with the common voltage supply circuit of the embodiment of the invention, the voltage value of the data voltage provided by the data driving circuit can be greatly reduced, thereby further reducing power consumption.

In another embodiment, referring to FIG. 1 and FIG. 2 together, the first transistor T1 and the second transistor T2 are turned on according to the high-level scan signal G(n) during the period P1, and the first The crystal T1 and the second transistor T2 respectively supply the first level signal V1 of the low level and the second level signal V2 of the high level to the control ends of the third transistor T3 and the fourth transistor T4, so that The fourth transistor T4 is turned on according to the second level signal V2 of the high level and provides a second common voltage Vcom- to the output terminal Output.

In still another embodiment, referring to FIG. 1 and FIG. 2 together, the first transistor T1 and the second transistor T2 are turned on according to the high-level scan signal G(n) during the period P2, and the first The crystal T1 and the second transistor T2 respectively supply the first level signal V1 of the high level and the second level signal V2 of the low level to the control ends of the third transistor T3 and the fourth transistor T4, respectively The three transistors T3 are turned on according to the first level signal V1 of the high level and provide the first common voltage Vcom+ to the output terminal Output.

In another embodiment, referring to FIG. 1 , the first capacitor C1 includes a first end and a second end, and the first end of the first capacitor C1 is coupled to the control end of the third transistor T3, and the first The second end of the capacitor C1 is coupled to the ground end Gnd. On the other hand, the second capacitor C2 includes a first end and a second end, the first end of the second capacitor C2 is coupled to the control end of the fourth transistor T4, and the second end of the second capacitor C2 is coupled to the second end Ground terminal Gnd.

On the other hand, the common voltage supply circuit of the embodiment of the present invention There is another configuration of the capacitor. For the configuration, please refer to FIG. 3 , which is a schematic diagram of a common voltage supply circuit according to another embodiment of the invention. As shown in the figure, the first capacitor C1 includes a first end and a second end. The first end of the first capacitor C1 is coupled to the control end of the third transistor T3, and the second end of the first capacitor C1 is coupled. At the second end of the third transistor T3. On the other hand, the second capacitor C2 includes a first end and a second end, the first end of the second capacitor C2 is coupled to the control end of the fourth transistor T4, and the second end of the second capacitor C2 is connected to the second end. The second end of the fourth transistor T4 is coupled. In this embodiment, the first capacitor C1 and the second capacitor C2 may be parasitic capacitances of the third transistor T3 and the fourth transistor T4, respectively. Therefore, compared to the common voltage supply circuit shown in FIG. The common voltage supply circuit in Fig. 3 uses the parasitic capacitance of the transistor itself, so that no additional capacitance is required, thereby saving cost.

It will be apparent from the above-described embodiments of the present invention that the application of the present invention has the following advantages. The embodiment of the present invention provides a common voltage supply circuit, thereby reducing the number of times of common voltage switching of the common voltage supply circuit output without increasing the complexity of the circuit wiring and increasing the circuit cost, thereby simultaneously reducing The purpose of cost and power consumption.

Although the embodiments of the present invention are disclosed in the above embodiments, the present invention is not intended to limit the invention, and the present invention may be practiced without departing from the spirit and scope of the invention. Various changes and modifications may be made thereto, and the scope of the invention is defined by the scope of the appended claims.

C1~C2‧‧‧ capacitor

G(n)‧‧‧ scan signal

Gnd‧‧‧ Grounding

Output‧‧‧output

T1~T4‧‧‧O crystal

V1‧‧‧ first level signal

V2‧‧‧second level signal

Vcom+‧‧‧ first common voltage

Vcom-‧‧‧second common voltage

Claims (10)

A common voltage supply circuit includes: a first transistor, comprising: a first end for receiving a first level signal; a control end for receiving a scan signal; and a second end; The second transistor includes: a first end for receiving a second level signal, wherein a voltage level of the first level signal is different from a voltage level of the second level signal; Receiving the scan signal; and a second end; a third transistor, comprising: a first end for receiving a first common voltage; and a control end coupled to the second of the first transistor And a second end coupled to the output end; a first capacitor coupled to the control end of the third transistor; a fourth transistor comprising: a first end for receiving a a second common voltage; a control end coupled to the second end of the second transistor; and a second end coupled to the output end; and a second capacitor coupled to the fourth transistor The control terminal, wherein the voltage level of the first level signal and the second level signal Pressure level does not change within the same time frame. The common voltage supply circuit of claim 1, wherein the first capacitor comprises: a first end coupled to the control end of the third transistor; and a second end coupled to a ground end. The common voltage supply circuit of claim 2, wherein the second capacitor comprises: a first end coupled to the control end of the fourth transistor; and a second end coupled to the ground end. The common voltage supply circuit of claim 1, wherein the second level signal is a low voltage level if the first level signal is a high voltage level. The common voltage supply circuit of claim 1, wherein the second level signal is a high voltage level if the first level signal is a low voltage level. The common voltage supply circuit of claim 1, wherein the voltage value of the first common voltage is greater than the voltage value of the second common voltage. The common voltage supply circuit of claim 1, wherein the first transistor and the second transistor are turned on according to the scan signal of a high level during a first period, the first transistor and the second transistor The crystal will be low The second level signal of the first level signal and the high level are supplied to the control terminals of the third transistor and the fourth transistor, so that the fourth transistor is in accordance with the high level The second level signal is turned on and the second common voltage is supplied to the output terminal. The common voltage supply circuit of claim 7, wherein the first transistor and the second transistor are turned on according to the scan signal of a high level during a second period, the first transistor and the second transistor The crystal respectively supplies the first level signal of the high level and the second level signal of the low level to the control end of the third transistor and the fourth transistor, so that the third transistor is The first level signal of the high level turns on and provides the first common voltage to the output terminal. A common voltage supply circuit includes: a first transistor, comprising: a first end for receiving a first level signal; a control end for receiving a scan signal; and a second end; The second transistor includes: a first end for receiving a second level signal, wherein a voltage level of the first level signal is different from a voltage level of the second level signal; Receiving the scan signal; and a second end; a third transistor comprising: a first end is configured to receive a first common voltage; a control end is coupled to the second end of the first transistor; and a second end is coupled to an output end; a first capacitor, The first end is coupled to the control end of the third transistor; and the second end is coupled to the second end of the third transistor; a fourth transistor includes: One end is configured to receive a second common voltage; a control end is coupled to the second end of the second transistor; and a second end is coupled to the output end; and a second capacitor coupled Connected to the control end of the fourth transistor. The common voltage supply circuit of claim 9, wherein the second capacitor comprises: a first end coupled to the control end of the fourth transistor; and a second end coupled to the fourth The second end of the crystal.