CN107342060B - Drive chip and display device - Google Patents

Abstract

The present invention provides a driver chip, which is used to drive a display panel, and the driver chip includes a chip motherboard and a source driver circuit integrated on the chip motherboard, wherein the driver chip also includes an integrated A voltage supply unit on the motherboard of the chip, the voltage supply unit can provide DC voltage. The invention provides a display device. The driving chip integrates a source driving circuit and a voltage supply unit, thereby improving the degree of integration of the display device.

Description

Driver chip and display device

technical field

The present invention relates to the field of display devices, in particular to a driving chip and a display device including the driving chip.

Background technique

With the development of display technology, consumer requirements are getting higher and higher, and the thinning and lightening of display devices is one of the major demands.

Therefore, how to improve the degree of integration of the display device has become a technical problem to be solved urgently in this field.

Contents of the invention

The object of the present invention is to provide a driving chip and a display device including the driving chip. The driving chip integrates a source driving function and a voltage supply function, thereby improving the degree of integration of the display device.

In order to achieve the above object, as one aspect of the present invention, a driver chip is provided, which is used to drive a display panel, and the driver chip includes a chip motherboard and a source driver circuit integrated on the chip motherboard , wherein the driver chip further includes a voltage supply unit integrated on the chip motherboard, and the voltage supply unit can provide a DC voltage.

Preferably, the DC voltage includes at least one of an analog supply voltage, a gate-on reference voltage, a gate-off reference voltage and a common voltage.

Preferably, the source driving signal includes a gamma voltage and a gamma reference voltage.

As another aspect of the present invention, a display device is provided, and the display device includes a display panel and a driving chip, wherein the driving chip is the above-mentioned driving chip provided by the present invention.

Preferably, the display panel includes a first gate driving circuit on one side of the display panel and a second gate driving circuit on the other side of the display panel, and the display panel includes a first display part and a second display part, the first display part is adjacent to the first gate drive circuit, the second display part is adjacent to the second gate drive circuit, and the display device includes two drive chips, One of the driving chips corresponds to the first gate driving circuit and the first display part, and the other driving chip corresponds to the second gate driving circuit and the second display part;

The source drive circuit of the drive chip corresponding to the first gate drive circuit provides a source drive signal for the first display part, and the voltage supply unit of the drive chip corresponding to the first gate drive circuit is the The first gate drive circuit and the first display part provide a DC voltage;

The source drive circuit of the drive chip corresponding to the second gate drive circuit provides source drive signals for the second display part, and the voltage supply unit of the drive chip corresponding to the second gate drive circuit is the The second gate driving circuit and the second display part provide DC voltage.

Preferably, the drive chip is bound on the display panel, and the display device further includes an external drive module, the external drive module includes a DC conversion circuit and a timing controller, and the DC conversion circuit is used to convert the system voltage to converted into a digital power supply voltage, the first output terminal of the DC conversion circuit is electrically connected to the input terminal of the voltage supply unit, and the second output terminal of the DC conversion circuit is electrically connected to the first input terminal of the timing controller connected, the second input end of the timing controller is used to receive a display signal, the timing controller is used to convert the display signal into a driving signal, the first output end of the timing controller is connected to the display device The driving signal input end of the gate driving circuit is electrically connected, and the second output end of the timing controller is electrically connected with the driving signal input end of the source driving circuit of the driving chip.

Preferably, the external drive module further includes a printed circuit board, and the DC conversion circuit and the timing controller are integrated on the printed circuit board.

Preferably, the display device further includes a flexible circuit board, the flexible circuit board electrically connects the first output terminal of the DC conversion circuit with the input terminal of the voltage supply unit, and the flexible circuit board also connects the The timing controller is electrically connected to the gate drive circuit of the display device.

Preferably, the display device further includes a backlight and a backlight driving circuit, the backlight is arranged on the light-incident side of the display panel, the backlight driving circuit is integrated on the printed circuit board, and the The output end of the backlight source driving circuit is electrically connected with the input end of the backlight source.

Preferably, the display device further includes an interface control module, the first output terminal of the interface control module is connected to the input terminal of the DC conversion circuit to provide the system voltage for the DC conversion circuit, and the interface control module The second output terminal of the module is connected with the timing controller to provide display signals for the timing controller.

The source driving circuit in the driving chip provided by the present invention is used for source driving the display panel, and the voltage supply unit is used for providing the DC voltage required for driving the display panel. Usually, the source driving circuit is arranged on one side of the display panel. Integrating the voltage supply unit and the source driver circuit on the same chip motherboard can increase the degree of integration of the driver chip, and further improve the degree of integration of the display device including the driver chip. Moreover, the driver chip can be bound in the display panel by binding, which saves the wiring for electrically connecting the voltage supply unit with the corresponding circuit (for example, the gate drive circuit), thereby reducing the voltage transmission process. The pressure drop in the middle reduces energy consumption.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, together with the following specific embodiments, are used to explain the present invention, but do not constitute a limitation to the present invention. In the attached picture:

Fig. 1 is the schematic diagram of the driver chip provided by the present invention;

2 is a schematic diagram of a display device provided by the present invention;

FIG. 3 is a schematic diagram of the signal flow of the display device provided by the present invention.

Explanation of reference signs

100: driver chip 110: chip motherboard

120: source drive circuit 130: voltage supply unit

200: display panel 210: first display part

220: Second display part 300: External drive module

310: DC conversion circuit 320: Timing controller

400: flexible circuit board 500: backlight drive circuit

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

As one aspect of the present invention, a driver chip 100 is provided, which is used to drive a display panel. As shown in FIG. 1 , the driver chip 100 includes a chip motherboard 110 and a source driver integrated on the chip motherboard 110 The circuit 120, wherein the driver chip 100 further includes a voltage supply unit 130 integrated on the chip motherboard 110, and the voltage supply unit 130 can provide a DC voltage.

The source driving circuit 120 in the driving chip provided by the present invention is used for source driving the display panel, and the voltage supply unit 130 is used for providing the DC voltage required for driving the display panel. Usually, the source driving circuit 120 is disposed on one side of the display panel. Integrating the voltage supply unit 130 and the source driver circuit 120 on the same chip motherboard 110 can improve the integration degree of the driving chip, and further improve the integration degree of the display device including the driving chip. Moreover, the driving chip 100 can be bound in the display panel by binding, which saves the wiring for electrically connecting the voltage supply unit 130 with the corresponding circuit (for example, a gate driving circuit), thereby reducing the voltage. The pressure drop during the transmission process reduces energy consumption.

In the present invention, there is no special requirement on the type of the DC voltage provided by the voltage supply unit 130. For example, when the display panel is a liquid crystal display panel, the DC voltage includes the analog power supply voltage AVDD, the gate turn-on reference voltage, the gate At least one of the reference voltage and the common voltage Vcom is turned off.

The liquid crystal display panel includes a plurality of pixel units, and a thin film transistor is arranged in each pixel unit. The gates of the thin film transistors in the pixel units in the same row are connected to the same gate line. A gate-on voltage and a gate-off voltage are provided to the gate lines by a gate drive circuit. The gate-on voltage can turn on the TFT, and the gate-off voltage can turn off the TFT. When the thin film transistor is an N-type transistor, the gate turn-on voltage is a high-level voltage VGH, and the gate turn-off voltage is a low-level voltage VGL. On the contrary, when the thin film transistor is a P-type transistor, the gate turn-on voltage is the low level voltage VGL, and the gate turn off voltage is the high level voltage VGH. In the present invention, the voltage supply unit 130 is used to provide the gate drive circuit with a gate open reference voltage, and the gate drive circuit uses the gate open reference voltage to generate a gate open voltage, and the voltage supply unit 130 is used to provide the gate drive circuit with The gate-off reference voltage is used by the gate drive circuit to generate the gate-off voltage.

The analog power supply voltage AVDD is a voltage for supplying power to the analog part inside the display device. The general mutual inductance voltage (ie, TV voltage) is about 15V, and the north bridge chip voltage (ie, NB voltage) is about 8V.

The common voltage Vcom is a voltage supplied to the common electrodes of the display panel.

In the present invention, the source driving signal may include a gamma voltage and a gamma reference voltage.

As a second aspect of the present invention, a display device is provided. As shown in FIG. 2 , the display device includes a display panel 200 and a driving chip 100 , wherein the driving chip 100 is the above-mentioned driving chip provided by the present invention.

As mentioned above, due to the integration of the source driver circuit 120 and the voltage supply unit 130 in the driver chip 100, the degree of integration of the display device can be improved.

Preferably, the driving chip 100 is bound on the display panel 200 . Due to the use of the bonding process, there is no need to arrange too many wires, so that various voltage drops during the transmission process of the voltage provided by the voltage supply unit 130 can be reduced, and power consumption can be reduced.

In order to simplify the circuit structure and facilitate manufacture, preferably, the display panel includes a first gate driving circuit A on one side of the display panel 200 and a second gate driving circuit B on the other side of the display panel 200 .

In order to reduce the heat generated by the driver chip, preferably, the display device may include two driver chips 100 . The display panel 200 may be divided into a first display part 210 and a second display part 220 . Wherein, the first display part 210 is adjacent to the first gate driving circuit A, and the second display part 220 is adjacent to the second gate driving circuit B. Referring to FIG.

As shown in FIG. 2, the display device includes two driving chips 100, specifically, one driving chip 100 (ie, the driving chip 100 on the left side in FIG. 2 ) and a first gate driving circuit A and a first display part 210. Correspondingly, another driver chip 100 (ie, the driver chip on the right side in FIG. 2 ) corresponds 220 to the second gate driver circuit B and the second display part.

The source driving circuit of the driving chip 100 corresponding to the first gate driving circuit A provides a source driving signal for the first display part 210, and the voltage supply unit of the driving chip 100 corresponding to the first gate driving circuit A is the first The gate driving circuit A and the first display part 210 provide a DC voltage.

The source drive circuit of the drive chip 100 corresponding to the second gate drive circuit B provides a source drive signal for the second display part 220, and the voltage supply unit of the drive chip 100 corresponding to the second gate drive circuit B is The second gate driving circuit B and the second display part 220 provide a DC voltage.

In the specific implementation shown in FIG. 2 , the two driver chips work independently, therefore, each driver chip has a relatively small load and thus has a small heat generation.

As shown in FIG. 3 , the display device further includes an external drive module 300 , and the external drive module 300 includes a DC conversion circuit 310 and a timing controller 320 . The input terminal of the DC conversion circuit 310 is used to convert the system voltage VDD into a digital power supply voltage DVDD, the first output terminal of the DC conversion circuit 310 is electrically connected to the input terminal of the voltage supply unit, and the second output terminal of the DC conversion circuit 310 It is electrically connected with the first input terminal of the timing controller 320, and the second input terminal of the timing controller 320 is used for receiving display signals, and the timing controller 320 can convert the display signals into driving signals. The first output end of the timing controller 320 is electrically connected to the driving signal input end of the gate driving circuit of the display device, and the second output end of the timing controller is connected to the driving signal of the source driving circuit of the driving chip. The input terminals are electrically connected.

Specifically, the display signal includes an initial data signal Data, an initial clock signal CLK, and a control signal Control. Wherein, the control signal is an enable signal for controlling the source driving circuit to start communication.

The timing controller 320 can convert the received display signals into low-voltage differential signals (LVDs or mini-LVDs), the final data signal Data', the final clock signal CLK', the initial control signal STV, the external routing signal OE1, and the external routing signal OE2 , gate start signal CPV, line start signal STH, TP1 signal, and polarity inversion signal POL.

The timing controller 320 can provide low voltage differential signals (LVDs or mini-LVDs), the final data signal Data', the final clock signal CLK', the polarity inversion signal POL, and the TP1 signal to the source driver circuit. The timing controller 320 may also provide the initial control signal STV, the external routing signal OE1 , the external routing signal OE2 , the line start signal STH, and the gate start signal CPV to the gate driving circuit.

In the present invention, the so-called direct current conversion circuit is often called "BUCK IC" by those skilled in the art, and the so-called timing controller is also often called "TCON" by those skilled in the art.

Wherein, the digital power supply voltage DVDD may be 2.5V.

The voltage supply unit generates a gate-on reference voltage, a gate-off reference voltage and a common voltage according to a digital power supply voltage DVDD.

The source driving circuit generates a gamma voltage and a gamma reference voltage according to the received signal.

In order to improve the degree of integration, preferably, as shown in FIG. 2 , the external drive module further includes a printed circuit board 330 on which the DC conversion circuit 310 and the timing controller 320 are integrated.

In order to facilitate electrical connection, as shown in FIG. 2, the display device further includes a flexible circuit board 400, which electrically connects the first output end of the DC conversion circuit 310 to the input end of the voltage supply unit, and The flexible circuit board 400 also electrically connects the timing controller 320 with the gate driving circuit and the source driving circuit of the display device.

In the embodiment shown in FIG. 2 , the display device includes two driving chips, therefore, the display device includes two flexible circuit boards 400 .

As mentioned above, the display panel can be a liquid crystal display panel, therefore, the display device can also include a backlight and a backlight driving circuit 500, the backlight is arranged on the light incident side of the display panel, and the backlight driving circuit 500 500 is integrated on the printed circuit board 330, and the output terminal of the backlight driving circuit 500 is electrically connected to the input terminal of the backlight.

Disposing the backlight driving circuit 500 on the printed circuit board 330 can improve the degree of integration of the display device.

In the present invention, the display device may further include an interface control module 600, the first output terminal of the interface control module 600 is connected to the input terminal of the DC conversion circuit 310, so as to provide the system voltage VDD for the DC conversion circuit. The second output terminal of the interface control module is connected to the timing controller to provide display signals for the timing controller.

As an implementation manner, the system voltage VDD may be 12V.

It can be understood that, the above embodiments are only exemplary embodiments adopted for illustrating the principle of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (8)

1. A display device comprises a display panel and a driving chip, wherein the driving chip is used for driving the display panel, the driving chip comprises a chip motherboard and a source driving circuit integrated on the chip motherboard, the driving chip further comprises a voltage supply unit integrated on the chip motherboard, the voltage supply unit can provide direct current voltage,

the drive chip is bound on the display panel, the display device also comprises an external drive module, the external driving module comprises a direct current conversion circuit and a time sequence controller, the direct current conversion circuit is used for converting system voltage into digital power supply voltage, the first output end of the direct current conversion circuit is electrically connected with the input end of the voltage supply unit, the second output end of the direct current conversion circuit is electrically connected with the first input end of the time schedule controller, a second input terminal of the time schedule controller is used for receiving display signals, the time schedule controller is used for converting the display signals into driving signals, the first output end of the time schedule controller is electrically connected with the driving signal input end of the grid driving circuit of the display device, a second output end of the time schedule controller is electrically connected with a driving signal input end of a source electrode driving circuit of the driving chip;

the direct current voltage includes a gate-on reference voltage and a gate-off reference voltage, the voltage supply unit is capable of providing the gate-on reference voltage to the gate driving circuit so that the gate driving circuit generates the gate-on voltage using the gate-on reference voltage, and the voltage supply unit is also capable of providing the gate-off reference voltage to the gate driving circuit so that the gate driving circuit generates the gate-off voltage using the gate-off reference voltage.

2. The display device according to claim 1, wherein the direct-current voltage further comprises at least one of an analog power supply voltage and a common voltage.

3. The display device according to claim 1 or 2, wherein the source driving signal includes a gamma voltage and a gamma reference voltage.

4. The display device according to claim 1 or 2, wherein the display panel includes a first gate driving circuit on one side of the display panel and a second gate driving circuit on the other side of the display panel, the display panel includes a first display portion and a second display portion, the first display portion is adjacent to the first gate driving circuit, the second display portion is adjacent to the second gate driving circuit, the display device includes two of the driving chips, one of the driving chips corresponds to the first gate driving circuit and the first display portion, and the other of the driving chips corresponds to the second gate driving circuit and the second display portion;

a source driving circuit of a driving chip corresponding to the first gate driving circuit provides a source driving signal for the first display part, and a voltage supply unit of the driving chip corresponding to the first gate driving circuit provides a direct current voltage for the first gate driving circuit and the first display part;

the source driving circuit of the driving chip corresponding to the second gate driving circuit provides a source driving signal for the second display part, and the voltage supply unit of the driving chip corresponding to the second gate driving circuit provides a direct current voltage for the second gate driving circuit and the second display part.

5. The display device according to claim 1 or 2, wherein the external driving module further comprises a printed circuit board, and the dc conversion circuit and the timing controller are integrated on the printed circuit board.

6. The display device according to claim 5, further comprising a flexible circuit board electrically connecting the first output terminal of the direct current conversion circuit and the input terminal of the voltage supply unit, and further electrically connecting the timing controller and a gate driving circuit of the display device.

7. The display device according to claim 6, further comprising a backlight source and a backlight source driving circuit, wherein the backlight source is disposed on the light incident side of the display panel, the backlight source driving circuit is integrated on the printed circuit board, and an output terminal of the backlight source driving circuit is electrically connected to an input terminal of the backlight source.

8. The display device according to claim 1 or 2, further comprising an interface control module, wherein a first output terminal of the interface control module is connected to an input terminal of the dc conversion circuit to provide the system voltage for the dc conversion circuit, and a second output terminal of the interface control module is connected to the timing controller to provide a display signal for the timing controller.