CN104123907B - Display device and method for switching display modes - Google Patents

Abstract

The invention discloses a display device and a method for switching display modes. In the method, at least one high-frequency signal is first provided, and a starting pulse signal is selectively provided in a two-dimensional mode or a three-dimensional mode according to the mode switching signal. Next, the high-frequency signal is decoded into a plurality of driving signals. Then, according to the mode switching signal, the plurality of driving signals are selectively provided in the two-dimensional driving mode or the three-dimensional driving mode after a preset time interval. Then, a picture is output according to the plurality of driving signals having a two-dimensional driving mode or a three-dimensional driving mode. Thereby, the present invention can prevent the gate driving module from leaking large current and being damaged due to the out-of-synchronization of the timing control module and the voltage level shift module when the display device switches to display a two-dimensional image or a three-dimensional image.

Description

Display device and method for switching display modes

technical field

The present invention relates to a display device and a method for switching display modes, in particular to a display device and a method for switching display modes that prevent a gate drive module from leaking a large current.

Background technique

At present, many display devices have the function of switching two-dimensional and three-dimensional images, so that users can use various application devices more conveniently. However, when the timing control module (Tcon) and the voltage level shift module (levelshifter) receive the conversion from two-dimensional display to three-dimensional display (that is, 2D to 3D), due to the different designs of various brands, the timing control module and The voltage level shift module may not receive the 2D to 3D conversion command synchronously. For example, in one example, when the timing control module first receives the 2D to 3D conversion command and has changed the pulse width of the initial pulse signal, if the voltage level shift module has not changed the output mode of the driving signal, the voltage The level shifting module will output wrong driving signals, resulting in the leakage current of the gate driving module, which further causes the power supply breakdown of the integrated circuit terminal.

In view of this, how to provide a display device and a method for switching display modes to solve the above problems has become an urgent problem in the industry.

Contents of the invention

The present invention provides a display device and a method for switching display modes, which are used to solve the problem in the prior art that the leakage current generated by the gate drive module further causes the power supply of the integrated circuit to collapse.

The present invention provides a method for switching display modes, which is suitable for a display device. The method includes: providing at least one high-frequency signal, and selectively providing a start pulse signal in a two-dimensional mode or a three-dimensional mode according to the mode switching signal; Decoding the high-frequency signal into a plurality of driving signals; according to the mode switching signal, selectively providing the plurality of driving signals in a two-dimensional driving mode or a three-dimensional driving mode after a preset time interval; and according to having a two-dimensional driving mode or the plurality of driving signals in a three-dimensional driving mode to output images.

The invention also discloses a display device utilizing the method for switching display modes. The display device includes a panel, a timing control module, a voltage level shift module and a gate driver module. The timing control module is used to provide at least one high-frequency signal, and is controlled by the mode switching signal to selectively provide the start pulse signal in the two-dimensional mode or the three-dimensional mode. The voltage level shifting module is coupled to the timing control module to decode the high-frequency signal into multiple driving signals, and is controlled by the mode switching signal. After a preset time interval, the two-dimensional driving mode or the three-dimensional driving mode can be selected selectively. The driving mode outputs the plurality of driving signals. The gate driving module is coupled to the panel and the voltage level shifting module, and is controlled by the plurality of driving signals output by the voltage level shifting module to drive the panel to output images.

Based on the above, the display device and the method for switching the display mode of the present invention enable the timing control module to switch the start pulse signal to a low voltage level in advance after receiving the three-dimensional mode and the start pulse signal by intervals of a predetermined period of time , that is, to change the length of the initial pulse signal, so as to prevent the transistors on the gate drive module from being turned on early when the drive signal is input, thus causing the gate drive module to leak a large current, and resulting in the collapse of the integrated circuit terminal power supply.

Description of drawings

FIG. 1 is a flowchart of a method for switching display modes according to an embodiment of the present invention;

2 is a functional block diagram of a display device according to an embodiment of the present invention;

FIG. 3 is a signal timing diagram for switching display modes according to an embodiment of the present invention;

FIG. 4 is a first-level gate drive module according to an embodiment of the present invention;

Fig. 5 is the signal timing diagram of the second cycle of the start pulse signal of Fig. 3 enlarged; and

FIG. 6 is a schematic diagram of a voltage level shifting module.

Among them, reference signs:

S02～S08 steps

HC1～8 drive signal

HC high frequency signal

LC1～2 low frequency signal

ST start pulse signal

mode_sw mode switching signal

end frame termination signal

T11, T12, T31, T41 Transistors

Q gate voltage

G drain voltage

VGH drain terminal

VSS negative voltage terminal

21 timing control module

22 voltage level shift module

23 gate drive module

221 decoding unit

222 picture frame detection unit

223 output unit

detailed description

Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a flowchart of a method for switching display modes according to an embodiment of the present invention, and FIG. 2 is a functional block diagram of a display device according to an embodiment of the present invention. As shown in the figure, the display device of this embodiment has a timing control module 21 , a voltage level shift module 22 and a gate driving module 23 . In step S02 , in addition to providing the high-frequency signal HC and the low-frequency signal LC, the timing control module 21 also selectively provides the start pulse signal ST in a two-dimensional mode or a three-dimensional mode according to the mode switching signal mode_sw. In practice, when the externally input mode switch signal mode_sw instructs the timing control module 21 to switch from the 2D mode to the 3D mode, the timing control module 21 will provide a start pulse signal ST with a shorter pulse width.

In step S04, after receiving the high-frequency signal HC from the timing control module 21, the voltage level shifting module 22 first decodes the high-frequency signal HC into a plurality of driving signals HC1-8 for driving the gate driving module twenty three. In addition, besides the high frequency signal HC, the timing control module 21 also provides the low frequency signal LC to drive the gate driving module 23 . In one example, the low-frequency signal LC and the high-frequency signal HC are independently separated, that is, the low-frequency signal LC does not need to be decoded, but is directly input to the gate driving module 23, wherein the timing control module 21 can provide at least two The low frequency signal is input to the driving gate driving module 23 . Corresponding to the circuit diagram in FIG. 4 , the low frequency signals are LC1 and LC2 .

In step S06 , according to the mode switching signal mode_sw, a plurality of driving signals are selectively provided in a 2D driving mode or a 3D driving mode after a preset time interval. For example, when the externally input mode switching signal mode_sw instructs the voltage level shifting module 22 to drive the gate driving module 23 in a two-dimensional driving mode, the voltage level shifting module 22 will sequentially output the driving signal HC1 one by one. ~8. If the mode switching signal mode_sw instructs the voltage level shifting module 22 to drive the gate driving module 23 in a three-dimensional driving mode, the voltage level shifting module 22 will output the driving signals HC1 - 8 in a pairwise combination.

In order to solve the problem in the prior art that when the display device is converted from a two-dimensional picture to a three-dimensional picture, the mode switching signal mode_sw may not be transmitted to the timing control module 21 and the voltage level shifting module 22 at the same time. Please refer to FIG. 3 . It is a timing diagram of signals for switching display modes according to an embodiment of the present invention. The present invention can ensure that after the preset time interval, the timing control module 21 will provide the start pulse signal ST with a three-dimensional mode signal, and the voltage level shift module 22 will also provide a three-dimensional mode signal. The drive mode outputs drive signals HC1-8. In other words, the purpose of pausing for a predetermined period of time is to avoid the moment when the display device switches from a 2D picture to a 3D picture. Even if the timing control module 21 and the voltage level shifting module 22 fail to receive the mode switching signal mode_sw synchronously, The correct start pulse signal ST and driving signals HC1-8 are stably provided after a preset time. The so-called interval of a preset time can start to count when the mode switching signal mode_sw is operated in the three-dimensional mode (high voltage level), so that the start pulse signal ST remains at a low voltage level and the gate cannot be turned on. The driving module 23 prevents the gate driving module 23 from leaking a large current. In other words, the display device of this embodiment does not immediately display the 3D picture when the 2D picture is converted into a 3D picture, but waits for a preset period of time, so that the timing control module 21 can stably output the correct pulse Wide start pulse signal ST.

Please continue to refer to FIG. 1, in step S08, after a preset time in one step, the gate drive module 23 will output gate signals according to the received drive signals HC1-8, and the drive signals HC1-8 can be The voltage level shifting module 22 transmits to the gate driving module 23 in a two-dimensional driving mode (provided sequentially) or a three-dimensional driving mode (provided in pairs). The display device includes multi-level gate driving modules 23 , and each level of gate driving modules 23 has the same circuit. In the embodiment of the present invention, eight levels of gate driving modules 23 are taken as an example. As shown in FIG. 4 , it is a circuit diagram of one of the primary gate driving modules 23 in the display device. The start pulse signal ST (start pulse) is input by the gate of the transistor T11 of the gate drive module 23 of each stage, and the drive signal after the high-frequency signal HC is decoded by the voltage level shift module 22 is respectively sent by the gate of each stage Drain input of the transistors T12 and T21 of the drive module. In the following examples, the numbers in parentheses indicate the symbolic meaning of the level.

As shown in Figure 3 and Figure 4, when the first-level gate drive module receives the drive signal HC1/HC2 and the start pulse signal ST, it will turn on the transistor T11, and the gate voltage Q(1) of the transistor T12 will therefore be In the state of high level, the transistors T12 and T21 are turned on accordingly, so that the drain voltage G(1) of the transistor T21 is also in the state of high level. In addition, in the structure of the display device, the drain of the transistor T21 of the first-level gate driving module can transmit the driving voltage G(1) to the gate Q(5) of the transistor T12 of the fifth-level gate driving module, to drive the fifth-level gate drive module, and the gate voltage Q(1) of the transistor T12 of the first-level gate drive module transmits the driving voltage G(5) to the first-level gate drive module through the fifth-level gate drive module. The transistors T31 and T41 of the gate driving module are turned on to lower the gate voltage Q(1) level of the transistor T12 and the drain voltage G(1) level of the transistor T21.

Please refer to FIG. 5 , which is a timing diagram of signals for switching display modes according to an embodiment of the present invention. The signal timing diagram of FIG. 5 demonstrates the situation that the timing control module 21 and the voltage level shifting module 22 fail to receive the mode switching signal mode_sw synchronously, that is, when the voltage level shifting module 22 has switched to two output (three-dimensional driving mode) to drive the signals HC1-8, but the timing control module 21 has not shortened the pulse width of the start pulse signal ST from the first width d1 to the second width d2. At this time, when the drive signal HC5/HC6 is transmitted to the drains of the gate drive module transistors T12 and T21 of the fifth and sixth stages, since the start pulse signal ST is still maintained at a high voltage level, the first stage The gate voltage Q(1) of the gate driving module transistor T12 is also maintained at a high voltage level, as shown by the solid line Q1/Q2. In other words, at this moment, the transistors T12 and T21 of the first-stage gate driving module are still in the ON state.

As mentioned above, since the gate voltages of the transistors T31 and T41 of the first-stage gate drive module are turned on by the drain voltage G(5) of the transistor T21 of the fifth-stage gate drive module, the first-stage gate When the transistors T12 and T21 of the pole driving module are still in the ON state, when the source voltage G(5) of the transistor T21 of the fifth-level gate driving module is transmitted to the gates of the transistors T31 and T41 of the first-level gate driving module Therefore, the transistors T31 and T41 are turned on, which will further make the transistors T11, T12 and T21 of the first-stage gate drive module form a conduction loop through the transistors T41 and T31, that is, it will cause the first-stage gate The drain terminal VGH (positive voltage terminal) of the driving module transistor T11 draws a large current to the negative voltage terminal VSS. It can be seen that, in this embodiment, by waiting for a predetermined period of time, the phenomenon of prematurely outputting the driving signals HC1 - 8 and causing the power supply of the entire integrated circuit to collapse is avoided.

Accordingly, in order to overcome the leakage current problem of the gate drive module in the prior art, the method for switching the display mode in the present invention generates a disable signal disable according to the mode switching signal mode_sw, and according to the disable signal disable, no display within a preset period of time output a plurality of driving signals to the gate driving module 23 . The disabling signal disable here refers to a signal that prohibits outputting a plurality of driving signals to the gate driving module 23 after the 3D mode is enabled, that is, after the 3D mode is converted to a state of a high voltage level for a preset period of time. Therefore, if a plurality of driving signals are not output to the gate driving module 23 for a predetermined period of time, the length of the start pulse signal ST can be changed after the timing control module 21 receives the three-dimensional pattern.

As shown in FIG. 5, when the length of the start pulse signal ST changes after enabling the three-dimensional mode, the gate voltage Q(1) of the transistor T12 of the first-stage gate driving module can be converted to a low voltage level, The transistors T12, T21 are further turned off earlier, as shown by the dotted lines. Accordingly, after changing the length of the start pulse signal ST to turn off the transistors T12 and T21 of the first-stage gate drive module early, it is possible to prevent the drain terminal VGH (positive voltage terminal) of the transistor T11 from drawing a large current to the negative voltage terminal VSS , to avoid the collapse of the power supply of the entire integrated circuit. Accordingly, the following method for switching display modes of the present invention can improve the problem of the initial pulse signal being out of sync with the high-frequency signal.

As mentioned above, when the voltage level shifting module 22 receives a three-dimensional mode instruction or when the mode switching signal mode_sw is at a high level, the voltage level shifting module 22 starts counting when the number of the first clock clk reaches the first threshold , end the preset time Tp, and stop the disable signal disable, that is, the disable signal disable is at a low level, so as to output the start pulse signal ST and a plurality of drive signals (HC1-8) to the gate drive module 23, please refer to the figure 3. In other words, when the disable signal disable is at a low level, the voltage level shifting module 22 can output the driving signal to the gate driving module 23 . In an embodiment of the present invention, when the number of the first clock clk reaches 16, the preset time Tp ends, and the disable signal disable is stopped to output a plurality of driving signals.

Furthermore, each output picture of the display device must be output after the start pulse signal is input, that is, whether it is a two-dimensional picture or a three-dimensional picture, the gate drive module 23 and cannot output the gate signal. Therefore, the method for switching display modes can also count the number of initial pulse signals according to when to output a 3D frame. In another embodiment, when the voltage level shifting module 22 receives the three-dimensional mode command or when the mode switching signal mode_sw is at a high level, the voltage level shifting module 22 can also count the number of the start pulse signal ST, and When the number of the start pulse signal ST reaches the second threshold, the preset time ends, and the disable signal disable is stopped to output a plurality of driving signals. In an embodiment of the present invention, when the number of the start pulse signal ST reaches 2, the disable signal disable is stopped to output a plurality of driving signals.

In another embodiment, when the voltage level shifting module 22 receives the 3D mode command or when the mode switching signal mode_sw is at a high level, the voltage level shifting module 22 starts counting the first clock according to the frame end signal end The number of clk or the number of pulse signals ST reaches the first threshold or the second threshold, and the disable signal disable is stopped to output a plurality of driving signals. As shown in FIG. 3 , the frame end signal end is generated after the first cycle of all driving signals (for example, HC1-8) is input, and the frame end signal end can be provided by the timing control module 21 or by the voltage level shift module 22 generated.

Accordingly, by the above method, the period of the start pulse signal ST of the timing control module after receiving the three-dimensional mode can be shortened, so that the start pulse signal can be converted to a low voltage level earlier, and the transistors of the first-stage gate drive module can be further The gate voltage Q(1) of T12 is converted to a low voltage level, so it cannot be turned on even when the fifth-stage gate drive module transmits the drive voltage G(5) to the transistors T31 and T41 of the first-stage gate drive module The transistor T12 can thus avoid the phenomenon that the drain terminal VGH of the transistor T11 of the first stage gate driving module leaks a large current to the negative voltage terminal VSS, causing the power supply collapse of the entire integrated circuit terminal.

In FIG. 2 , the display device of the present invention includes a panel (not shown), a timing control module 21 , a voltage level shift module 22 and a gate driving module 23 . The timing control module 21 provides at least one high-frequency signal, and is controlled by a mode switching signal for controlling switching between 2D and 3D images, so as to select a start pulse signal ST for providing output images according to the 2D mode or the 3D mode.

The voltage level shifting module 22 is coupled to the timing control module 21 for decoding the high frequency signal into a plurality of driving signals, and is controlled by the mode switching signal. Compared with the prior art, the display device of the present invention outputs a plurality of driving signals in a two-dimensional driving mode or a three-dimensional driving mode after a preset time interval. The gate driving module 23 is coupled to the panel and the voltage level shifting module 22 , and is controlled by a plurality of driving signals output by the voltage level shifting module 22 to drive the panel to output images.

Please refer to FIG. 6 , which is a schematic diagram of the voltage level shifting module 22 in FIG. 2 . The voltage level shifting module 22 includes a decoding unit 221 , a frame detection unit 222 and an output unit 223 . The decoding unit 221 is coupled to the timing control module 21 for decoding the high frequency signal into a plurality of driving signals for output to the gate driving module 23 . The frame detection unit 222 is coupled to the decoding unit 221 and the timing control module 21, generates a disable signal disable according to the mode switching signal, and outputs a plurality of driving signals in a 2D driving mode or a 3D driving mode according to the mode switching signal. The output unit 223 is coupled to the frame detection unit 222 and the gate driving module 23, receives a plurality of driving signals and is controlled by a disable signal disable, and does not output a plurality of driving signals within the above-mentioned preset time.

The frame detection unit 222 can be used to count the number of the first clock clk and the number of the start pulse signal ST. When the picture frame detection unit 222 receives the three-dimensional mode instruction or the mode switching signal mode_sw is at a high level, the number of counting the first clock clk reaches the first threshold value, and the preset time is over, and the picture frame detection unit 222 stops transmitting the disable signal disable to the output unit 223, and output a plurality of drive signals through the output unit 223; or, when the frame detection unit 222 receives the mode switching signal and the frame end signal end, it starts counting the number of the first clock clk, when When the number of the first clock clk reaches the third threshold, the frame detection unit 222 stops sending the disable signal disable to the output unit 223 .

When the picture frame detection unit 222 receives the mode switch signal and the number of the counting start pulse signal ST reaches the second threshold value, the picture frame detection unit 222 stops sending the disable signal disable to the output unit 223, and outputs a number of signals through the output unit 223 or, when the picture frame detection unit 222 receives the mode switching signal and the picture frame end signal end, it starts to count the number of the start pulse signal ST and reaches the second threshold value, and the picture frame detection unit 222 stops transmitting the disable signal disable to the output unit 223.

Accordingly, the display device can prevent the drain terminal VGH of the transistor T11 of the gate drive module from leaking a large current to the negative voltage terminal VSS by synchronizing the start pulse signal and the high-frequency signal by using the above-mentioned method of switching display modes, causing the entire integrated circuit terminal Phenomenon of power failure.

To sum up, the display device and the method for switching display modes of the present invention enable the timing control module to switch the start pulse signal to a low voltage level in advance after receiving the three-dimensional mode and the start pulse signal by intervals of a predetermined period of time. , that is to change the length of the second period of the initial pulse signal, so as to prevent the transistors on the gate drive module from being turned on early when a high-frequency signal is input, thus causing the gate drive module to leak a large current, resulting in an integrated circuit terminal Phenomenon of power failure.

Claims (10)

1. the method switching display pattern a, it is adaptable to display device, it is characterised in that this display device includes sequential control Molding block, voltage level shift module and grid electrode drive module, described method comprises:

This time-sequence control mode provides at least one high-frequency signal, and according to a mode switching signal, optionally with a two dimension mould Formula or a tridimensional model provide an initial pulse signal；

This high-frequency signal is decoded into multiple driving signal by this voltage level shift module；

This voltage level shift module is according to this mode switching signal, after being spaced a Preset Time, optionally drives with a two dimension Dynamic model formula or a three-dimensional drive pattern provide those to drive signal；And

This grid electrode drive module is according to those driving signal output pictures with this two dimension drive pattern or this three-dimensional drive pattern Face.

2. the method for claim 1, it is characterised in that according to this mode switching signal, after being spaced this Preset Time, Optionally provide those to drive in the step of signal with this two dimension drive pattern or this three-dimensional drive pattern, also comprise:

A forbidden energy signal is produced according to this mode switching signal；And

According to this forbidden energy signal, in this Preset Time, do not export those drive signal.

3. method as claimed in claim 2, it is characterised in that according to this forbidden energy signal, do not export in this Preset Time Those drive in the step of signal, also comprise:

Depending at least on this mode switching signal, the quantity of counting one first seasonal pulse；And

When the quantity counting this first seasonal pulse reaches first threshold value, this Preset Time terminates, and stops this forbidden energy signal with defeated Go out those and drive signal.

4. method as claimed in claim 3, it is characterised in that in depending at least on this mode switching signal, count this first time In the step of the quantity of arteries and veins, also comprise:

According to this mode switching signal and a picture frame termination signal, start counting up the quantity of this first seasonal pulse.

5. method as claimed in claim 2, it is characterised in that according to this forbidden energy signal, do not export in this Preset Time Those drive in the step of signal, also comprise:

Depending at least on this mode switching signal, count the quantity of this initial pulse signal；And

When the quantity of this initial pulse signal reaches second threshold value, this Preset Time terminates, and stops this forbidden energy signal with defeated Go out those and drive signal.

6. method as claimed in claim 5, it is characterised in that in depending at least on this mode switching signal, count this initial arteries and veins In the step of the quantity rushing signal, also comprise:

According to this mode switching signal and a picture frame termination signal, start counting up the quantity of this initial pulse signal.

7. a display device, it is characterised in that comprise:

One panel；

One time-sequence control mode, in order to provide at least one high-frequency signal, and is controlled by a mode switching signal, optionally with one Two-dimensional model or a tridimensional model provide an initial pulse signal；

One voltage level shift module, couples this time-sequence control mode, in order to this high-frequency signal to be decoded into multiple driving signal, And it is controlled by this mode switching signal, after being spaced a Preset Time, optionally drive so that a two dimension drive pattern or one are three-dimensional Pattern exports those and drives signal；And

One grid electrode drive module, couples this panel and this voltage level shift module, is controlled by this voltage level shift module defeated Those gone out drive signal, to drive this panel to export picture.

8. display device as claimed in claim 7, it is characterised in that this voltage level shift module comprises:

One decoding unit, couples this time-sequence control mode, drives signal in order to this high-frequency signal to be decoded into those；

One picture frame detector unit, couples this decoding unit and this time-sequence control mode, produces a taboo according to this mode switching signal Energy signal, and according to this mode switching signal, export those with this two dimension drive pattern or this three-dimensional drive pattern and drive signal； And

One output unit, couples this picture frame detector unit and this grid electrode drive module, receives those and drives signal, and is controlled by this Forbidden energy signal, does not export those in this Preset Time and drives signal.

9. display device as claimed in claim 8, it is characterised in that when this picture frame detector unit receives this pattern switching letter Number, and when the quantity counting one first seasonal pulse reaches first threshold value, this Preset Time terminates, this picture frame detector unit stops passing Giving this forbidden energy signal to this output unit, this output unit exports those and drives signal.

10. display device as claimed in claim 8, it is characterised in that when this picture frame detector unit receives this pattern switching letter Number, and when the quantity counting this initial pulse signal reaches second threshold value, this Preset Time terminates, this picture frame detector unit is stopped Only transmitting this forbidden energy signal to this output unit, this output unit exports those and drives signal.