CN101533612A - Liquid crystal display device and driving module thereof - Google Patents

Abstract

A driving module is used for driving a liquid crystal display panel. The driving module comprises a time sequence control circuit, a data driving circuit and at least one distribution circuit. The data driving circuit is connected to the liquid crystal display panel through a plurality of data lines. The time sequence control circuit transmits at least one control signal and a data signal to the distribution circuit through the first transmission interface. The distribution circuit transmits the control signal and the data signal to the data driving circuit through the second transmission interface, and the transmission frequency of the first transmission interface is different from the transmission frequency of the second transmission interface. A liquid crystal display device with the driving module is also disclosed.

Description

Liquid crystal display device and its driving module

technical field

The invention relates to a display device and its driving module, in particular to a liquid crystal display device and its driving module.

Background technique

With the development of flat panel display device technology, liquid crystal display devices have gradually replaced traditional cathode ray tube display devices due to their superior characteristics such as light and thin body, low power consumption and no radiation, and have been applied to various electronic products. With the trend of the times, the miniaturization and cost reduction of electronic products has always been the goal of the industry.

Referring to FIG. 1 , a conventional liquid crystal display device 1 includes a liquid crystal display panel 11 and a driving module 12 . The driving module 12 is adjacent to the liquid crystal display panel 11 and has a timing control circuit 121 and a data driving circuit 122 . The timing control circuit 121 is disposed on the circuit board B1, and transmits at least one control signal (such as a frequency signal, a polarity inversion signal...) and a data signal to the data driving circuit 122 via a flexible printed circuit (FPC) 125. The data driving circuit 122 is connected to the liquid crystal display panel 11 via a plurality of data lines, and drives the liquid crystal display panel 11 according to the above signals.

The traditional timing control circuit has different numbers of output pins (pins) depending on the resolution of the liquid crystal display panel, and with the improvement of the resolution of the liquid crystal display panel 11, the number of pins of the timing control circuit 121 also needs to be increased. Increase accordingly to increase the number of signal transmissions. However, this also increases the packaging volume of the timing control circuit 121 and the area of the circuit board B1, so that the product cannot be miniaturized, and the increased area of the circuit board B1 and the increased pins of the timing control circuit 121 also greatly increase the cost.

Therefore, how to provide a liquid crystal display device and its driving module, which can maintain or even reduce the number of pins of the timing control circuit while improving the resolution, so as to miniaturize the electronic products and reduce the cost, is a current problem to be solved. one of the problems.

Contents of the invention

In view of the above problems, the purpose of the present invention is to provide a liquid crystal display device and its driving module that can maintain or even reduce the number of pins of the timing control circuit while improving the resolution, thereby reducing the size and cost.

Therefore, to achieve the above purpose, a driving module according to the present invention drives a liquid crystal display panel. The driving module includes a timing control circuit, a data driving circuit and at least one distribution circuit. The data driving circuit is connected to the liquid crystal display panel via a plurality of data lines. The timing control circuit transmits at least one control signal and one data signal to the distribution circuit through the first transmission interface. The distribution circuit transmits the control signal and the data signal to the data driving circuit through the second transmission interface, and the transmission frequency of the first transmission interface is different from that of the second transmission interface.

To achieve the above purpose, a liquid crystal display device according to the present invention includes a liquid crystal display panel and a driving module. The driving module drives the liquid crystal display panel and includes a timing control circuit, a data driving circuit and at least one distribution circuit. The data driving circuit is connected to the liquid crystal display panel via a plurality of data lines. The timing control circuit transmits at least one control signal and one data signal to the distribution circuit through the first transmission interface. The distribution circuit transmits the control signal and the data signal to the data driving circuit through the second transmission interface, and the transmission frequency of the first transmission interface is different from that of the second transmission interface.

As mentioned above, according to the liquid crystal display device and its driving module of the present invention, at least one distribution circuit is provided between the timing control circuit and the data driving circuit. A high-frequency transmission interface can be used between the distribution circuit and the timing control circuit, which can reduce the number of pins of the timing control circuit, thereby reducing the packaging volume and the area of the circuit board of the timing control circuit, and achieving the purpose of miniaturization and cost reduction.

Description of drawings

FIG. 1 is a schematic diagram of an existing liquid crystal display device;

2 is a schematic diagram of a liquid crystal display device according to a preferred embodiment of the present invention;

3 is a block diagram of a timing control circuit and a distribution circuit of a liquid crystal display device according to a preferred embodiment of the present invention; and

FIG. 4 to FIG. 8 are schematic diagrams of various variations of the liquid crystal display device according to the preferred embodiment of the present invention.

Detailed ways

A liquid crystal display device and its driving module according to preferred embodiments of the present invention will be described below with reference to the accompanying drawings, wherein the same elements will be described with the same reference symbols.

Referring to FIG. 2 , a liquid crystal display device 2 according to a preferred embodiment of the present invention includes a liquid crystal display panel 21 and a driving module 22 . The driving module 22 is adjacent to the liquid crystal display panel 21 and includes a timing control circuit 221 , a data driving circuit 222 and at least one distribution circuit 224 .

The timing control circuit 221 transmits at least one control signal (such as a frequency signal, a polarity inversion signal . . . ) and a data signal to the distribution circuit 224 through the first transmission interface. The distribution circuit 224 transmits the control signal and the data signal to the data driving circuit 222 through the second transmission interface. The data driving circuit 222 is connected to the liquid crystal display panel 21 through a plurality of data lines, and drives the liquid crystal display panel 21 according to the control signal and the data signal.

In this embodiment, the timing control circuit 221 is an integrated circuit (IC), and is disposed on the circuit board B2. The distribution circuit 224 is an integrated circuit and is disposed on the circuit board B2. The data driving circuit 222 is arranged on the thin film transistor substrate of the liquid crystal display panel 21 to form a chip on glass (Chip On Glass, COG) manner.

Referring to FIG. 3 , the internal structures of the timing control circuit 221 and the distribution circuit 224 are further described. The timing control circuit 221 has a data receiving unit 2211 , a data/control signal generating unit 2212 and at least one first transmitting unit 2213 . The data receiving unit 2211 receives image data transmitted from the external interface. The data/control signal generating unit 2212 converts the image data into data signals and control signals available to the data driving circuit 222, and also generates other control signals by itself. The first transmission unit 2213 transmits the data signal and the control signal to the distribution circuit 224 .

The distribution circuit 224 has at least one first receiving unit 2241 , at least one signal converting unit 2242 and at least one second transmitting unit 2243 . The first receiving unit 2241 receives the data signal and the control signal transmitted by the first transmitting unit 2213 . The first receiving unit 2241 and the first transmitting unit 2213 form a first transmission interface. The signal converting unit 2242 converts the control signal and the data signal according to the second transmission interface, and transmits the control signal and the data signal to the second receiving unit (not shown) in the data driving circuit 222 by the second transmitting unit 2243 . The second transmitting unit 2243 and the second receiving unit of the data driving circuit 222 form a second transmission interface.

In this embodiment, the first transmission interface is a higher frequency transmission interface, and relative to the first transmission interface, the second transmission interface is a lower frequency transmission interface. Wherein, the first transmission interface is, for example but not limited to, an AC coupling interface or a fast peripheral component connection interface. The second transmission interface is, for example but not limited to, CMDI or a reduced swing differential signaling (Reduced Swing Differential Signaling, RSDS) interface. The signal conversion unit 2242 of this embodiment has a serial-to-parallel signal conversion function.

In the present invention, the arrangement positions of the timing control circuit and the distribution circuit are not limited to those shown in FIG. 2 . As shown in Figure 4, the distribution circuit 324 is arranged on the film F3, and becomes the chip on film (Chip On Film, COF) mode, can make the area of circuit board B3 smaller so as to reduce cost; As shown in Figure 5, The number of distribution circuits 424 can be increased according to needs, such as higher resolution, three distribution circuits 424 are shown in FIG. 5; as shown in FIG. In the same integrated circuit; as shown in Figure 7, the timing control circuit and at least one of the distribution circuits are integrated in the chip 625 and arranged on the film F6 to form a chip-on-film mode; and as shown in Figure 8, the timing The control circuit and at least one of the distribution circuits are integrated in the chip 725 and arranged on the film F7. In addition, the other distribution circuit 724 is also arranged on another film F7, and the way of forming a chip on a film can reduce the size of the circuit board B7. size and reduce costs.

To sum up, according to the liquid crystal display device and its driving module of the present invention, at least one distribution circuit is provided between the timing control circuit and the data driving circuit. A high-frequency transmission interface can be used between the distribution circuit and the timing control circuit, which can reduce the number of pins of the timing control circuit, thereby reducing the packaging volume and the area of the circuit board of the timing control circuit, and achieving the purpose of miniaturization and cost reduction.

The above description is for illustration only, not for limitation. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the scope of the appended claims.

Claims (15)

1. A drive module for driving a liquid crystal display panel, the drive module comprising: Timing control circuit; a data driving circuit having a plurality of data lines connected to the liquid crystal display panel; and at least one distribution circuit; Wherein, the timing control circuit transmits at least one control signal and one data signal to the distribution circuit through the first transmission interface, and the distribution circuit transmits the control signal and the data signal to the data distribution circuit through the second transmission interface. A driving circuit, and the transmission frequency of the first transmission interface is different from the transmission frequency of the second transmission interface. 2. The driving module according to claim 1, wherein the timing control circuit is disposed on a circuit board or a film. 3. The driving module as claimed in claim 1, wherein the data driving circuit is disposed on the liquid crystal display panel. 4. The driving module according to claim 1, wherein the distribution circuit is disposed on a circuit board or a film. 5. The driver module of claim 1, wherein at least one of the distribution circuits is located on the same integrated circuit as the timing control circuit. 6. The driving module according to claim 1, wherein the transmission frequency of the first transmission interface is greater than the transmission frequency of the second transmission interface. 7. The driving module according to claim 1, wherein the first transmission interface is an AC coupling interface or a fast peripheral component connection interface. 8. The driving module according to claim 1, wherein the second transmission interface is one of CMDI and RSDS. 9. The drive module according to claim 1, wherein the first transmission interface comprises at least one first transmission unit and at least one first reception unit, the first transmission unit is set in the timing control circuit, the The first receiving unit is set in the distribution circuit. 10. The drive module according to claim 1, wherein the second transmission interface comprises at least one second transmission unit and at least one second reception unit, the second transmission unit is arranged in the distribution circuit, the The second receiving unit is arranged in the data driving circuit. 11. The driving module according to claim 1, wherein the distribution circuit comprises at least one signal conversion unit, which converts the control signal and the data signal according to the second transmission interface. 12. A liquid crystal display device, comprising: liquid crystal display panel; and The driver module drives the liquid crystal display panel, and includes: Timing control circuit; a data driving circuit, having a plurality of data lines connected to the liquid crystal display panel; and at least one distribution circuit; Wherein, the timing control circuit transmits at least one control signal and one data signal to the distribution circuit through the first transmission interface, and the distribution circuit transmits the control signal and the data signal to the data distribution circuit through the second transmission interface. A driving circuit, and the transmission frequency of the first transmission interface is different from the transmission frequency of the second transmission interface. 13. The liquid crystal display device according to claim 12, wherein the first transmission interface comprises at least one first transmission unit and at least one first reception unit, the first transmission unit is arranged in the timing control circuit, The first receiving unit is set in the distribution circuit. 14. The liquid crystal display device according to claim 12, wherein the second transmission interface comprises at least one second transmission unit and at least one second reception unit, the second transmission unit is arranged in the distribution circuit, The second receiving unit is arranged in the data driving circuit. 15. The liquid crystal display device as claimed in claim 12, wherein the distribution circuit comprises at least one signal conversion unit, which converts the control signal and the data signal according to the second transmission interface.

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