CN100468514C - Voltage level adjusting circuit, method and display device - Google Patents

Abstract

The invention relates to a voltage level adjusting circuit, a method and a display device. The display device comprises at least one data line and a voltage level adjusting circuit, wherein the voltage level adjusting circuit comprises a capacitor and a switch, the capacitor receives a reference voltage, the reference voltage is used for charging the capacitor to a voltage level, the switch is electrically connected with the data line and the capacitor, and a voltage of the data line is adjusted through the conduction of the switch and the voltage level of the capacitor.

Description

Voltage level adjustment circuit, method and display device

technical field

The invention relates to a display device and a voltage level adjustment circuit and method for adjusting the voltage level of the display device.

Background technique

In recent years, flat panel displays have developed more and more rapidly, and have gradually replaced traditional cathode ray tube displays. Today's flat panel displays mainly include the following types: Organic Light-Emitting Diodes Display (OLED), Plasma Display Panel (PDP), Liquid Crystal Display (LCD), and Field Emission Display ( Field Emission Display; FED), etc. Among them, liquid crystal displays have become the mainstream of today's consumer displays due to their low power consumption, thinness, and high resolution.

A general liquid crystal display is mainly composed of a pixel array and a driving circuit. Each pixel in the pixel array is mainly composed of a pixel switch and a liquid crystal capacitor, and the driving circuit is used to control each pixel in the pixel array. On and off, so that the pixel array completes the display of the screen.

In order to reduce the operating voltage of the driving circuit to achieve low power consumption, the common voltage (Vcom) required by the general liquid crystal display is generated by an AC driving method. Due to the influence of the characteristics of the AC driving method, the common voltage provided by the AC driving method will cause the voltage shift of the pixel capacitor, and cause the voltage level shift of other floating lines, the most obvious of which is The voltage level of the data line of the pixel drifts. Because the capacitance of the data line is much larger than the capacitance of the pixel, and the capacitance of the data line is a floating connection at the moment when the pixel is driven. Therefore, when the pixels are driven, the voltage levels of the data lines will shift, which will increase the voltage required to drive the pixels. In order to compensate for the large voltage required to drive the pixels generated by the voltage level shift of the data line, the driving circuit needs to have the ability to provide a larger voltage, which not only consumes more power, but also affects the driving pixels. time.

In order to solve the above problems, usually when manufacturing liquid crystal displays, the manufacturer will connect the data line to a fixed voltage source, and pre-charge the capacitance of the data line by controlling the time when the fixed voltage source is turned on, so as to control the voltage of the data line. level and narrow the voltage range that the driving circuit needs to provide, thereby shortening the time for driving the pixels. Although connecting the data line to a fixed voltage source can improve the ability of the driving circuit to provide voltage. But on the contrary, using this method will greatly increase the power consumption of the common voltage, and easily cause the voltage level shift of the common voltage.

Therefore, how to control the voltage level of the data line within an appropriate range, and improve the ability of the driving circuit to provide voltage, so as to shorten the time required for driving the pixels, is the goal that the flat panel display manufacturers need to work on.

Contents of the invention

In view of this, the present invention proposes a voltage level adjustment circuit and a method for adjusting the voltage level, which adjust the voltage of the data line of the pixel by conducting a capacitor and a switch.

An object of the present invention is to provide a voltage level adjustment circuit applied to a display device. The display device includes at least one data line. The voltage level adjustment circuit includes a capacitor and at least one switch. The capacitor receives a reference voltage, and the reference voltage is used to charge the capacitor to a voltage level. The switch is electrically connected to the data line and the capacitor. And a voltage of the data line is adjusted through the conduction of the switch and the voltage level of the capacitor.

Another object of the present invention is to provide a display device, which includes at least one data line and the voltage level adjustment circuit mentioned in the preceding paragraph. The display device adjusts a voltage of the data line through the voltage level adjustment circuit.

Another object of the present invention is to provide a method for adjusting a voltage level, which is applied to a display device. The display device includes at least one data line. The method includes the following steps: providing a capacitor; charging the capacitor to a voltage level according to a reference voltage; providing at least one switch; and adjusting a voltage level of the data line when the switch is turned on. Voltage.

The present invention uses a capacitor and a switch to control the voltage of the data line of the display device, so as to control the voltage of the data line within an appropriate range, thereby improving the ability of the driving circuit of the display device to provide voltage, and shortening the driving time of the display device. The time required by the circuit to drive the pixel.

After referring to the drawings and the implementation methods described later, those skilled in the art can understand other objectives of the present invention, as well as the technical means and implementation aspects of the present invention.

Description of drawings

Fig. 1 is the schematic diagram of the first embodiment of the present invention;

Figure 2 is a schematic diagram of a second embodiment of the present invention; and

Fig. 3 is a flow chart of the third embodiment of the present invention.

Figure number:

1: Display device 11: Pixel array

13: Voltage level adjustment circuit 15, 17: Peripheral circuits

111, 112, 113: scan lines 114, 115, 116: data lines

130: Reference voltage 131: Reference voltage circuit

132: The first signal 133: The first switch

133a: first contact 133b: second contact

134: Second signal 135: Capacitance

135a: first pole 135b: second pole

137: The first power supply 139: The second switch

1311: Voltage divider module 1313: Second power supply

1315: Third power supply 2: Display device

R: Resistance

Detailed ways

As shown in FIG. 1 , the first embodiment of the present invention is a display device 1 including a pixel array 11 , a voltage level adjustment circuit 13 , and peripheral circuits 15 , 17 . The pixel array 11 includes a plurality of scanning lines (indicated by 111 , 112 , 113 here for convenience of illustration) and a plurality of data lines (indicated by 114 , 115 , 116 in the figure for convenience of illustration). The voltage level adjustment circuit 13 includes a reference voltage circuit 131 , a plurality of first switches 133 and a capacitor 135 . The reference voltage circuit 131 is used to generate a reference voltage 130 . The first switches 133 are respectively electrically connected to the data lines 114 , 115 , 116 and the capacitor 135 . The peripheral circuit 15 provides driving voltages for the scan lines 111 , 112 , 113 . The peripheral circuit 17 provides the driving voltage of the data lines 114, 115, 116, and the voltage level adjustment circuit 13 is disposed between the peripheral circuit 17 and the data lines 114, 115, 116 to adjust the voltage of the data lines 114, 115, 116 .

The capacitor 135 has a first pole 135a and a second pole 135b. The first pole 135 a of the capacitor 135 is used to receive the reference voltage 130 , and the second pole 135 b of the capacitor 135 is electrically connected to a first power source 137 . The capacitor 135 is charged to a voltage level through the reference voltage 130 and the first power source 137 . The reference voltage 130 is preferably approximately close to the central value of the common voltage of the display device 1, so as to control the voltages of the data lines 114, 115, 116 within an appropriate range, and can be used to improve the peripheral circuit 17 of the display device 1 to provide voltage capability, and shorten the time required for the peripheral circuit 17 of the display device 1 to drive the pixel array 11 .

The first switches 133 respectively have a first contact 133a and a second contact 133b. The first contacts 133 a of the first switches 133 are electrically connected to the first pole 135 a of the capacitor 135 . The second contacts 133b of the first switches 133 are electrically connected to the data lines 114 , 115 , 116 respectively.

The reference voltage circuit 131 includes a voltage dividing module 1311 , and the voltage dividing module 1311 is electrically connected to a second power source 1313 and a third power source 1315 . The voltage dividing module 1311 includes a plurality of resistors R for dividing the voltage difference between the second power source 1313 and the third power source 1315 and generating the reference voltage 130 .

When the first switch 133 is turned on (turnon) by the control of a first signal 132, the data lines 114, 115, 116 can be electrically connected to the capacitor 135 through the first switch 133, and the capacitor 135 can be used. The achieved voltage level is adjusted for the data lines 114 , 115 , 116 in order to achieve the purpose of controlling the voltage of the data lines. The aforementioned first signal 132 can be provided by the peripheral circuits 15 , 17 , or by other control circuits in the display device 1 . Those skilled in the art can use various circuits to achieve the purpose of providing the first signal 132 , so details will not be repeated here.

In this embodiment, the first power source 137 and the second power source 1313 can be a ground signal, that is, a voltage of 0 volts. However, the voltage dividing module 1311 does not limit the number of resistors R. More specifically, the voltage dividing module 1311 does not limit the voltage dividing method of the second power supply 1313 and the third power supply 1315, except for dividing the voltage by a plurality of resistors R Those skilled in the art can also use other voltage dividing methods to achieve the purpose of the present invention, so details will not be repeated here.

The second embodiment of the present invention, as shown in FIG. 2 , is another display device 2 whose structure is mostly the same as that of the display device 1 . The difference is that the voltage level adjustment circuit 13 further includes a second switch 139 . The second switch 139 is electrically connected between the reference voltage circuit 131 and the first pole 135a of the capacitor 135, and its conduction is controlled by a second signal 134, so as to avoid the reference voltage when the first switch 133 is turned on. 130 will be affected by the voltage of the data lines 114 , 115 , 116 to generate an offset. The detailed actions of the first switch 133 and the second switch 139 are described in the following paragraphs. The aforementioned second signal 134 can also be provided by the peripheral circuits 15 , 17 , or by other control circuits in the display device 1 . Those skilled in the art can use various circuits to achieve the purpose of providing the second signal 134 , so details will not be repeated here.

When the second switch 139 is turned on, the reference voltage 130 can be electrically connected to the capacitor 135 through the second switch 139 , and the capacitor 135 can be boosted to a voltage level by the reference voltage 130 . In order to isolate the reference voltage 130 from the voltages of the data lines 114 , 115 , 116 , when the first switch 133 of this embodiment is turned on, the second switch 139 is not turned on. Conversely, if the second switch 139 is turned on, the first switch 133 is not turned on. One implementation aspect is to make the first signal 132 and the second signal 134 an antiphase signal. However, the present invention does not limit the relationship between the first signal 132 and the second signal 134. When the first switch 133 and the second switch 139 are transistors of different types, for example, the first switch 133 and the second switch 139 are respectively P-type When metal oxide semiconductor transistors (P_MOS) and N-type metal oxide semiconductor transistors (N_MOS) are used, the first signal 132 and the second signal 134 can be in-phase signals. Those skilled in the art can understand the conduction relationship between the first switch 133 and the second switch 139 through the foregoing description, so details are not repeated here.

The third embodiment of the present invention, as shown in FIG. 3 , is a method for adjusting a voltage level in a display device. The display device may be the display device 2 described in the second embodiment. The method is described below.

When step S01 is executed, a capacitor, such as the capacitor 135 of the second embodiment, is provided. Then step S02 is executed to provide a first switch to electrically connect the capacitor and the data line of the display device, such as the first switch 133 of the second embodiment. Step S03 is then executed to provide a second switch electrically connected to the capacitor, such as the second switch 139 of the second embodiment. Step S04 is executed to transmit a reference voltage to the capacitor when the second switch is turned on, and the reference voltage may be the reference voltage 130 of the second embodiment. Step S05 is then executed to charge the capacitor to a voltage level according to the reference voltage. Finally, step S06 is executed. When the first switch is turned on, a voltage of a data line, such as the voltages of the data lines 114 , 115 , 116 in the second embodiment, is adjusted through the voltage level.

The present invention uses a capacitor and a switch to control the voltage of the data line of the display device, so as to control the voltage of the data line within an appropriate range, thereby improving the ability of the driving circuit of the display device to provide voltage, and shortening the driving time of the display device. The time required for the circuit to drive the pixels is to avoid the disadvantages caused by the too long time spent in driving the pixels in the prior art.

The above-mentioned embodiments are only used to illustrate the implementation of the present invention and explain the technical features of the present invention, and are not intended to limit the scope of the present invention. Any changes or equivalence arrangements that can be easily accomplished by those skilled in the art belong to the scope of the present invention, and the scope of rights of the present invention should be based on the scope of claims.

Claims (16)

1. a voltage level regulation circuit is used for a display device, and described display device comprises at least one data line, and described voltage level regulation circuit comprises:

One electric capacity, in order to receive a reference voltage, described reference voltage is in order to charge to a voltage level to described electric capacity; And

At least one first switch electrically connects described data line and described electric capacity;

Wherein, the described voltage level of described electric capacity is used to adjust a voltage of described data line by the conducting of described first switch.

2. voltage level regulation circuit as claimed in claim 1 is characterized in that:

Described electric capacity has one first utmost point and one second utmost point, and described first utmost point is in order to receive described reference voltage, and described second utmost point is electrically connected to one first power supply; And

Described first switch has one first contact and one second contact, and described first contact is electrically connected to first utmost point of described electric capacity, and described second contact is electrically connected to described data line.

3. voltage level regulation circuit as claimed in claim 1 also comprises a reference voltage circuit, in order to produce described reference voltage.

4. voltage level regulation circuit as claimed in claim 3, it is characterized in that, described reference voltage circuit has a division module, described division module electrically connects a second source and one the 3rd power supply, and produces described reference voltage according to described second source and described the 3rd power supply.

5. voltage level regulation circuit as claimed in claim 4 is characterized in that the division module of described reference voltage circuit comprises a plurality of resistance.

6. voltage level regulation circuit as claimed in claim 3 also comprises a second switch, electrically connects described reference voltage circuit and described electric capacity, and described reference voltage transfers to described electric capacity by the conducting of described second switch.

7. voltage level regulation circuit as claimed in claim 6, described display device also comprises at least one driving circuit, described voltage level regulation circuit is in order to be received one first signal and a secondary signal by described driving circuit, described first signal is in order to control the conducting of described first switch, and described secondary signal is in order to control the conducting of described second switch.

8. display device comprises:

At least one data line; And

One voltage level regulation circuit comprises:

One electric capacity, in order to receive a reference voltage, described reference voltage is in order to charge to a voltage level to described electric capacity; And

At least one first switch electrically connects described data line and described electric capacity;

Wherein, the described voltage level of described electric capacity by the conducting of described first switch in order to adjust a voltage of described data line.

9. display device as claimed in claim 8 is characterized in that:

Described electric capacity has one first utmost point and one second utmost point, and described first utmost point is in order to receive described reference voltage, and described second utmost point is electrically connected to one first power supply; And

Described first switch has one first contact and one second contact, and described first contact is electrically connected to first utmost point of described electric capacity, and described second contact is electrically connected to described data line.

10. display device as claimed in claim 8 is characterized in that described voltage level regulation circuit also comprises a reference voltage circuit, in order to produce described reference voltage.

11. display device as claimed in claim 10, it is characterized in that, described reference voltage circuit has a division module, and described division module electrically connects a second source and one the 3rd power supply, and produces described reference voltage according to described second source and described the 3rd power supply.

12. display device as claimed in claim 11 is characterized in that, the division module of described reference voltage circuit is made up of a plurality of resistance.

13. display device as claimed in claim 10, it is characterized in that, described voltage level regulation circuit also comprises a second switch, is electrically connected to described reference voltage circuit and described electric capacity, and described reference voltage transfers to described electric capacity by the conducting of described second switch.

14. display device as claimed in claim 13 also comprises:

At least one driving circuit;

Described voltage level regulation circuit is in order to be received one first signal and a secondary signal by described driving circuit, described first signal is in order to control the conducting of described first switch, and described secondary signal is in order to control the conducting of described second switch.

15. a method of adjusting voltage level, described method is applied to a display device, and described display device comprises at least one data line, and described method comprises the following step:

One electric capacity is provided;

According to a reference voltage described electric capacity is charged to a voltage level;

At least one first switch is provided, electrically connects described electric capacity and described data line; And

When described first switch conduction, adjust a voltage of described data line by the voltage level of described electric capacity.

16. method as claimed in claim 15 also comprises the following step:

One second switch is provided; And

When described second switch conducting, transmit described reference voltage to described electric capacity.

Images