TW201543432A - Source driver, driving circuit and display apparatus - Google Patents

Abstract

A source driver, driving circuit using the same and display apparatus using the same are provided. The display apparatus includes a display panel, a timing controller and a source driver. The timing controller receives an external image signal to provide a compressed image signal. The source driver is used for receiving the compressed image signal, has a decompressor used for transforming the compressed image signal into a restored image data, and provides a plurality of source driving signal to drive the display panel according to a plurality of display data of the restored image data.

Description

Source driver, drive circuit and display device

The present invention relates to a driver, and more particularly to a source driver, a driver circuit, and a display device.

Nowadays, multimedia technology has become quite developed due to advances in semiconductor components or display devices. As for the display device, a liquid crystal display (LCD) having superior characteristics such as high image quality, good space utilization efficiency, low power consumption, and no radiation has gradually become the mainstream of the market. In the conventional driving mode, the data transmission rate of the liquid crystal display panel rises sharply with high image quality and high frame rate, which causes many problems, such as high wafer transfer speed and high image processing speed. The power consumption of the display device is increased, it is difficult to pass the system safety certification, and the hardware cost is increased. Therefore, how to reduce the amount of transmission of image data in the display device without affecting the picture quality or the acceptable range becomes a problem in designing the display device.

The invention provides a source driver, a driving circuit and a display device, which can reduce the data transmission rate between the sequence controller and the source driver, thereby avoiding problems caused by high data transmission rate.

The source driver of the present invention comprises a decompressor, a plurality of data latch units and a digital analog converter. The decompressor receives a compressed image data and decompresses to provide a restored image data, wherein the restored image data includes a plurality of display materials. These data latching units are used to latch these display materials and provide these display materials in sequence. A digital analog converter for sequentially receiving the display data to convert the display data from a digital format to an analog format, and sequentially generating a plurality of analog output signals.

In an embodiment of the invention, each of the compressed image data includes a plurality of lines of display data, and the decompressor obtains the display data of the plurality of lines simultaneously after decompressing the compressed image data of the pen.

In an embodiment of the invention, the compression unit of the compressed image data is N pixel*M pixel, wherein N pixel*M pixel represents M pixels in the N lines, and N and M are positive integers.

In an embodiment of the invention, the total number of data latching units = 2+P, where P is a positive integer and P = N.

In an embodiment of the invention, the total number of data latch units = 2+P, where P is a positive integer and P < N.

In an embodiment of the invention, N=2 and M=2.

In an embodiment of the invention, N = 1, M = 4.

In an embodiment of the invention, the total number of data latching units is three. Moreover, the data latching unit includes a first latching unit, a second latching unit and a third latching unit. The display data of each of the displayed data is temporarily stored in the first latching unit. And one of the third latching units is divided into two, and is further provided by the first latching unit and the third latching unit to the second latching unit.

In an embodiment of the present invention, the first latching unit temporarily stores the display data of the first line of the display materials and the previous or the last paragraph or the entire segment of the display data of the plurality of subsequent lines. The second latching unit temporarily stores the entire segment of the display data of each of the displayed data, and the third latching unit sequentially stores the second line of the display data and the subsequent lines. Each of the displayed data is in the previous or last paragraph or the entire paragraph.

In an embodiment of the invention, the total number of data latching units is four. Moreover, the data latching unit includes a first latching unit, a second latching unit, a third latching unit, and a fourth latching unit, and the display data of each of the displayed data is temporarily suspended. And being stored in one of the first latching unit and the fourth latching unit, and further provided by the fourth latching unit to the third latching unit, and further provided by the first latching unit and the third latching unit The second latch unit.

In an embodiment of the present invention, the first latching unit sequentially stores the display data of the odd lines among the display materials, and the second latching unit sequentially stores the display data of each of the display materials. The three latching unit sequentially and intermittently stores the display data of the even lines in the display materials, and the fourth latching unit sequentially stores the display data of the even lines in the display data.

In an embodiment of the invention, the source driver further includes a charge sharing control circuit coupled to the decompressor to determine whether to initiate charge sharing between the plurality of data channels according to the display data of the plurality of lines.

In an embodiment of the invention, the source driver further includes a receiver for receiving a compressed image signal to provide compressed image data.

In an embodiment of the invention, the source driver further includes a memory unit coupled between the receiver and the decompressor.

In an embodiment of the invention, the source driver further includes a bus remapping unit coupled between the decompressor and the data latch units for distributing the display data to the data latch units.

In an embodiment of the invention, the source driver further includes an output buffer coupled to the digital analog converter to generate a plurality of source driving signals according to the analog output signals.

The driving circuit of the present invention is used to drive a display panel and includes a timing controller and a source driver. The timing controller is configured to provide a compressed image signal. The source driver is configured to receive the compressed image signal, and has a decompressor to convert the compressed image signal into a restored image data, and sequentially provide a plurality of source driving signals according to the plurality of display data of the restored image data.

The display device of the present invention includes a display panel, a timing controller and a source driver. The timing controller is configured to receive an external image signal to provide a compressed image signal. The source driver is configured to receive the compressed image signal, and has a decompressor to convert the compressed image signal into a restored image data, and according to the restored image The plurality of display materials of the data provide a plurality of source drive signals to drive the display panel.

In an embodiment of the invention, the timing controller receives an external image signal from the outside, and the external image signal is over-compressed.

In an embodiment of the invention, the display device further includes a host that compresses an image signal to provide a compressed external image signal.

In an embodiment of the invention, the timing controller includes a compressor for compressing an external image signal to form a compressed image signal.

In an embodiment of the invention, the timing controller further includes a memory unit coupled between the compressor and the source driver for storing the compressed image signal.

In an embodiment of the invention, the source driver further includes a memory unit coupled between the timing controller and the decompressor for storing the compressed image signal.

Based on the above, the source driver, the driving circuit, and the display device of the embodiment of the present invention, between the timing controller and the source driver, transmit data through the compressed compressed image signal to reduce the sequence controller and the source driver. The data transfer rate between them can avoid the problems caused by high data transfer rates.

The above described features and advantages of the invention will be apparent from the following description.

10, 20‧‧‧ host

11, 511‧‧‧ Compressor

100, 500‧‧‧ display devices

101, 501‧‧‧ drive circuit

110, 510‧‧‧ timing controller

120, 120a, 120b, 120c, 520‧‧‧ source drivers

121, 513‧‧‧ memory unit

123‧‧‧Decompressor

130‧‧‧ display panel

210‧‧‧ Receiver

220, 310‧‧‧ Bus remapping unit

230, 320‧‧‧ data channel

231‧‧‧Digital Analog Converter

233‧‧‧Output buffer

410‧‧‧ Charge sharing control circuit

420‧‧‧Charge sharing circuit

D11~D16, D17a, D17b, D18a, D18b, D21~D28‧‧‧ Display data

DCI‧‧‧Compressed image data

DRI‧‧‧Reduced image data

L11, L21‧‧‧ first latch unit

L12, L22‧‧‧Second lock unit

L13, L23‧‧‧ third interlocking unit

L24‧‧‧4th locking unit

PD1, PD2, PSC1~PSC6‧‧‧ horizontal scanning period

SAO‧‧‧ analog output signal

SCPI‧‧‧Compressed image signal

SDX‧‧‧ source drive signal

SEIa, SEIb‧‧‧ external image signals

SIM‧‧‧ image signal

S610, S620, S630‧‧‧ steps

1 is a system diagram of a display device in accordance with an embodiment of the present invention.

2A is a schematic diagram of a system of a source driver in accordance with an embodiment of the present invention.

2B is a schematic diagram of data latching of a data latch unit according to an embodiment of the invention.

3A is a schematic diagram of a system of a source driver in accordance with another embodiment of the present invention.

FIG. 3B is a schematic diagram of data latching of a data latch unit according to another embodiment of the present invention. FIG.

4 is a system diagram of a source driver in accordance with still another embodiment of the present invention.

FIG. 5 is a schematic diagram of a system of a display device according to another embodiment of the present invention.

6 is a flow chart of a method of operating a display device in accordance with an embodiment of the present invention.

1 is a system diagram of a display device in accordance with an embodiment of the present invention. Referring to FIG. 1 , in the embodiment, the display device 100 receives the external image signal SEIa provided by the host 10 from the outside, and includes a display panel 130 and a driving circuit 101 for driving the display panel 130 . The host 10 includes, for example, a compressor 11, that is, the host 10 is a compressed image signal SIM to provide an external image signal SEIa that has been compressed. In this embodiment, the driving circuit 101 includes a timing controller 110 and a plurality of source drivers 120, but in other embodiments, the driving circuit 101 may further include a gate driver (not shown), which is implemented by the present invention. The example is not limited to this.

In this embodiment, after receiving the compressed external image signal SEIa, the timing controller 110 may directly output the compressed external image signal SEIa as the compressed image signal SCPI. The source driver 120 is configured to receive a compressed image signal The SCPI has a memory unit 121 and a decompressor 123. The memory unit 121 is coupled between the timing controller 110 and the decompressor 123 for storing the compressed image signal SCPI. After the decompressor 123 accesses the compressed video signal SCPI from the memory unit 121, the decompressed video signal SCPI is decompressed and converted into the restored video data DRI. At this time, the source driver 120 provides a plurality of source driving signals SDX according to the plurality of display materials of the restored image data DRI to drive the display panel 130.

According to the above, since the data is transmitted between the timing controller 110 and the source driver 120 through the compressed compressed image signal SCPI, the data transmission rate between the timing controller 110 and the source driver 120 varies with the data compression rate. And down, thereby avoiding the problems caused by high data transfer rates.

In the present embodiment, the compressor 11 and the decompressor 123 correspond to the same compression mode. Further, it is assumed that each compressed image data DCI on the compressed image signal SCPI is display data including a plurality of horizontal lines, and after the decompressor 123 decompresses the compressed image data, the display of the plurality of lines is simultaneously obtained. data. In an embodiment of the present invention, the compression unit of the compressed image data DCI may be N pixel*M pixel, where N pixel*M pixel represents M pixels in the N lines, and N and M are positive integers. For example, the compression unit of the compressed image data DCI may be 1 pixel*4 pixel, or 2 pixel*2 pixel, but this may be adjusted according to the knowledge of those skilled in the art, and the embodiment of the present invention is not limited thereto.

Moreover, in the present embodiment, the host 10 is set, for example, outside the display device 100. However, in other embodiments, the host 10 can be set inside the display device 100, which can be determined by those of ordinary skill in the art. The embodiment is not limited thereto.

2A is a schematic diagram of a system of a source driver in accordance with an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2A, wherein the same or similar elements are given the same or similar reference numerals. In this embodiment, the source driver 120a includes, for example, a receiver 210, a memory unit 121, a decompressor 123, a bus remapping unit 220, and a plurality of data channels 230, wherein the data channel 230 has a plurality of data latch units ( For example, the first latch unit L11, the second latch unit L12 and the third latch unit L13), the digital analog converter 231 and the output buffer 233. Moreover, in this embodiment, it is assumed that the compression unit of the compressed image data DCI is 2 pixel*2 pixel, and the total number of data latch units in the data channel 230 can be set to three (ie, the first latch unit L11, the first The second latching unit L12 and the third latching unit L13), that is, in addition to the two fixed data latching units, the update 1 (equal to 2-1) data latching unit is used to store the decompressed display data. (such as D11~D16).

The receiver 210 is configured to receive the compressed image signal SCPI to provide compressed image data DCI. The memory unit 121 is coupled between the receiver 210 and the decompressor 123 for storing the compressed image data DCI of the compressed image signal SCPI. After receiving the compressed image data DCI from the memory unit 121, the decompressor 123 decompresses the compressed image data DCI to provide the restored image data DRI, wherein the restored image data DRI includes a plurality of display materials (eg, D11~D16). The bus remapping unit 220 is coupled between the decompressor 123 and the first latch unit L11, the second latch unit L12, and the third latch unit L13 for allocating display materials (such as D11~D16) to The first latch unit L11, the second latch unit L12, and the third latch unit L13.

The digital analog converter 231 is transmitted through the first latch unit L11 and the second latch After the unit L12 and the third latching unit L13 sequentially receive the corresponding display materials (such as D11~D16), the received display materials (such as D11~D16) are converted from the digital format to the analog format, and sequentially generated. An analog output signal SAO. The output buffer 233 is coupled to the digital analog converter 231 to generate a source drive signal SDX according to the analog output signal SAO.

2B is a schematic diagram of data latching of a data latch unit according to an embodiment of the invention. Referring to FIG. 2A and FIG. 2B, since the compression unit of the compressed image data DCI is 2 pixel*2 pixel, and the data transmission rate is correspondingly set to half of the original, a complete compressed image data DCI requires two horizontal scanning periods. (such as PD1, PD2 and PSC1~PSC6) to transmit.

Further, in the preliminary horizontal scanning period PD1 to PD2, the display data D11 and D12 of the first and second lines are stored in the first latch unit L11 and the third latch unit L13, and the second latch unit L12 will remain blank (ie N/A). In the first horizontal scanning period PSC1, the display data D11 is transferred from the first latch unit L11 to the second latch unit L12 to transmit the display material D11 to the digital analog converter 231 through the second latch unit L12. At this time, the first latch unit L11 is blank, but the third latch unit L13 still stores the display material D12 to be displayed and cannot be used.

Since only half of the compressed image data DCI can be transmitted during one horizontal scanning period, PSC1 can only obtain the first half of the display data D13 and D14 of the third and fourth lines (indicated by D13a and D14a) during the horizontal scanning period. Moreover, in order for the decompressor 123 to operate normally, the display materials D13a and D14a are stored. The first latch unit L11. Similarly, in the second horizontal scanning period PSC2, the display data D12 is transferred from the third latch unit L13 to the second latch unit L12, and the display data D13 and the rear half of the D14 output from the decompressor 123 ( It will be stored in the third latch unit L13 as indicated by D13b and D14b.

During the third horizontal scanning period PSC3, the display data D13 is transferred from the first latching unit L11 and the third latching unit L13 to the second latching unit L12, and the first latching unit L11 and the third latching The blank position in the cell L13 stores the first half of the display data D15 and D16 of the 5th and 6th lines (indicated by D15a and D16a). During the fourth horizontal scanning period PSC4, the display data D14 is transferred from the first latching unit L11 and the third latching unit L13 to the second latching unit L12, and the first latching unit L11 and the third latching The blank position in the unit L13 stores the second half of the display data D15 and D16 of the fifth and sixth lines (indicated by D15b and D16b). At this time, the first latch unit L11 is like storing the complete display data D15, and the third latch unit L13 is like storing the complete display data D16. The operation of the PSC1 during the first to fourth horizontal scanning periods may be performed by the first latching unit L11 and the third latching unit L13 (for example, D17, D18) and transmitted to the second latch unit L12.

According to the above, the display data of each line (such as D11~D16) is temporarily stored in one of the first latching unit L11 and the third latching unit L13 or divided into two, and then by the first latching unit. The L11 and the third latch unit L13 are supplied to the second latch unit L12. Further, the first latching unit L11 can temporarily store the first line of the display data (such as D12~D16) and display the data D11 and the subsequent multiples. The display data of each line (such as D12~D16) is before, after or the whole paragraph; the second latching unit L12 temporarily stores the display data of each of these display materials (such as D12~D16). And the third latching unit L13 can temporarily store the display data of the second line display data D12 and the plurality of subsequent lines (such as D12~D16) among the display materials (such as D11~D16). One before or after or the whole.

3A is a schematic diagram of a system of a source driver in accordance with another embodiment of the present invention. 2A and 3A, wherein the same or similar elements are given the same or similar reference numerals. In the present embodiment, the source driver 120b is substantially the same as the source driver 120a, except that each data channel 320 has four data latch units (ie, the first latch unit L21 and the second latch unit L22). The third latching unit L23 and the fourth latching unit L24), and the display data (such as D21~D28) are distributed to the first latching unit L21 and the second latching unit L22 through the busbar remapping unit 310. The third latch unit L23 and the fourth latch unit L24. Here, the embodiment still assumes that the compression unit of the compressed image data DCI is 2 pixel*2 pixel, and the total number of data latching units in the data channel 320 is set to four, that is, two data plugs except the fixed setting. In addition to the lock unit, two data latch units are updated to store the decompressed display data (such as D21~D28).

FIG. 3B is a schematic diagram of data latching of a data latch unit according to another embodiment of the present invention. FIG. Referring to FIG. 3A and FIG. 3B, since the compression unit of the compressed image data DCI is 2 pixel*2 pixel, and the data transmission rate is correspondingly set to half of the original, a complete compressed image data DCI requires two horizontal scanning periods. (Such as PD1, PD2 and PSC1~PSC6) are transmitted.

Further, in the preliminary horizontal scanning period PD1 to PD2, the display data D21 and D22 of the first and second lines are stored in the first latching unit L21 and the fourth latching unit L24, and the second latching unit L22 and the third latch unit L23 will first remain blank (ie N/A). In the first horizontal scanning period PSC1, the display data D21 is transferred from the first latch unit L21 to the second latch unit L22 to transmit the display material D21 to the digital analog converter 231 through the second latch unit L22. And, the display material D22 is transferred to the third latch unit L23 by the fourth latch unit L24. At this time, since the first latch unit L21 and the fourth latch unit L24 are emptied, the next compressed image data DCI, that is, the display data D13 and D14 of the third and fourth lines can be stored.

During the second horizontal scanning period PSC2, the display data D12 is transferred from the third latching unit L23 to the second latching unit L22, and the first latching unit L21 and the fourth latching unit L24 continue to store the display data D13. And D14. The operation of the post-sequential horizontal scanning period (such as PSC4~PSC6) can refer to the action of PSC1 during the first and second horizontal scanning periods, and is stored through the first latching unit L21, the third latching unit L23, and the fourth latching unit L24. Other display materials (such as D17, D18) are transmitted to the second latch unit L22.

According to the above, the display data of each line (such as D11~D16) is temporarily stored in one of the first latching unit L21 and the fourth latching unit L24, and is further provided by the fourth latching unit L24. The third latch unit L23 is further provided to the second latch unit L22 by the first latch unit L21 and the third latch unit L23. Enter one Step, the first latching unit L21 can sequentially store the display data of the odd lines (such as D11, D13, D15) in the display data (such as D11~D16), and the second latching unit L22 sequentially stores the displayed data. (For example, D11~D16), the third latch unit L can sequentially and intermittently store the display data of the even lines (such as D12, D14, D16) in the display data (such as D11~D16). And the fourth latching unit L24 can sequentially store the display data (such as D12, D14, D16) in the display data (such as D11~D16).

4 is a system diagram of a source driver in accordance with still another embodiment of the present invention. 2A and 4, wherein the same or similar elements are given the same or similar reference numerals. In the present embodiment, the source driver 120c is substantially the same as the source driver 120a, except that the source driver 120c further includes a charge sharing control circuit 410 and a charge sharing circuit 420. The charge sharing circuit 420 is coupled to the outputs of all of the data channels 230 to be controlled by the charge sharing control circuit 410 to perform charge sharing between all of the data channels 230. The charge sharing circuit 420 is coupled to the decompressor 123 and the charge sharing circuit 420 to receive a plurality of display data (eg, D11~D16) included in the restored image data DRI, and transmit the received display data (eg, D11~D16). To determine whether to perform charge sharing between all data channels 230.

FIG. 5 is a schematic diagram of a system of a display device according to another embodiment of the present invention. Referring to Figures 1 and 5, the same or similar elements are designated by the same or similar reference numerals. In the present embodiment, the display device 500 is substantially the same as the display device 100, except for the driving circuit 501, wherein the driving circuit 501 includes, for example, a timing controller 510 and a plurality of source drivers 520. In this embodiment, the host 20 directly transmits images. The signal SIM, that is, provides an uncompressed external image signal SEIb.

The timing controller 511 includes compressors 511 and 513. The compressor 511 is configured to compress the external image signal SEIb to form a compressed image signal SCPI. The memory unit 513 is coupled between the compressor 511 and the source driver 520 for storing compression. Image signal SCPI. In other words, after the compressor 511 receives the uncompressed external image signal SEIb, the external image signal SEIb is compressed to form a compressed image signal SCPI, and transmitted to the source driver 520 through the memory unit 513. Further, the source driver 520 of the present embodiment has a decompressor 123 that decompresses the compressed video signal SCPI and converts it into reduced image data DRI. At this time, the source driver 520 still provides a plurality of source driving signals SDX to drive the display panel 130 according to the plurality of display materials of the restored image data DRI.

6 is a flow chart of a method of operating a display device in accordance with an embodiment of the present invention. Referring to FIG. 6, in the embodiment, the operation method of the display device includes the following steps. First, an external image signal is received through the timing controller to provide a compressed image signal (step S610). Then, the compressed image signal is received by the source driver (step S620), and the compressed image signal is converted into the restored image data by the decompressor of the source driver to sequentially provide multiple display data according to the restored image data. The display voltage is applied to the display panel to drive the display panel (step S630). The order of the foregoing steps S610, S620, and S630 is for illustrative purposes, and the embodiment of the present invention is not limited thereto. For details of the above steps S610, S620, and S630, reference may be made to the embodiments shown in FIG. 1, FIG. 2A, FIG. 2B, FIG. 3A, FIG. 3B, FIG. 4, FIG. 5, and FIG. 6, and details are not described herein again.

In summary, in the source driver, the driving circuit and the display device of the embodiment of the invention, the timing controller and the source driver transmit data through the compressed compressed image signal to reduce the sequence controller and the source. The data transfer rate between the drives, thereby avoiding the problems caused by high data transfer rates. Moreover, through the cross-data storage, the number of data latching units in the data channel can be reduced. Furthermore, since the restored image data is display data including a plurality of lines, each of the restored image data can be used to determine whether to perform charge sharing between the data channels to reduce the power consumption of the source driver.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

10‧‧‧Host

11‧‧‧Compressor

100‧‧‧ display device

101‧‧‧ drive circuit

110‧‧‧Sequence Controller

120‧‧‧Source Driver

121‧‧‧ memory unit

123‧‧‧Decompressor

130‧‧‧ display panel

DCI‧‧‧Compressed image data

DRI‧‧‧Reduced image data

SCPI‧‧‧Compressed image signal

SDX‧‧‧ source drive signal

SEIa‧‧‧ external image signal

SIM‧‧‧ image signal

Claims (29)

A source driver includes: a decompressor that receives a compressed image data and decompresses to provide a restored image data, wherein the restored image data includes a plurality of display materials; and a plurality of data latching units for latching Displaying the data, and providing the display materials in sequence; and a digital analog converter for sequentially receiving the display materials to convert the display data from a digital format to an analog format, and sequentially generating multiple Analog output signal. The source driver of claim 1, wherein the compressed image data of each pen comprises display data of a plurality of lines, and the decompressor performs the decompression on the compressed image data of the pen. At the same time, the display data of the plurality of lines is obtained. The source driver according to claim 1, wherein the compressed image data has a compression unit of N pixel*M pixel, wherein N pixel*M pixel represents M pixels of the N lines, and N and M are both Is a positive integer. The source driver of claim 3, wherein the total number of the data latch units = 2+P, where P is a positive integer and P=N. The source driver of claim 3, wherein the total number of the data latch units = 2+P, where P is a positive integer and P < N. The source driver of claim 3, wherein N=2, M=2. The source driver of claim 3, wherein N=1, M=4. The source driver of claim 1, wherein the total number of the data latching units is three. The source driver of claim 8, wherein the data latching unit comprises a first latching unit, a second latching unit and a third latching unit, each of the display materials The display data of the line is first temporarily stored in one of the first latching unit and the third latching unit or divided into two, and then the first latching unit and the third latching unit are provided to the The second latch unit. The source driver of claim 9, wherein the first latching unit temporarily stores each of the display data of the display data and the display data of the plurality of subsequent lines in sequence. The second latching unit sequentially stores the entire segment of the display data of each of the displayed data, and the third latching unit temporarily stores the displayed data in sequence. The second line shows the previous or last paragraph or the entire paragraph of each of the data and the display data of the subsequent lines. The source driver of claim 1, wherein the total number of the data latching units is four. The source driver of claim 11, wherein the data latching unit comprises a first latching unit, a second latching unit, a third latching unit, and a fourth latching unit. The display data of each of the display materials is temporarily stored in one of the first latch unit and the fourth latch unit, and the fourth latch unit is further provided to the third plug. The lock unit is further provided to the second latch unit by the first latch unit and the third latch unit. The source driver of claim 12, wherein the first latching unit sequentially stores display data of the odd lines among the display materials, and the second latching unit sequentially stores the displays. The display data of each line in the data, the third latching unit sequentially and intermittently stores the display data of the even lines in the display materials, and the fourth latching unit sequentially stores the displayed data. Display data of the line. The source driver of claim 1, further comprising a charge sharing control circuit coupled to the decompressor, and determining whether to initiate charge sharing between the plurality of data channels according to the display data of the plurality of lines . The source driver of claim 1, further comprising: a receiver for receiving a compressed image signal to provide the compressed image data. The source driver of claim 15, further comprising: a memory unit coupled between the receiver and the decompressor. The source driver of claim 1, further comprising: a bus remapping unit coupled between the decompressor and the data latch units for allocating the display materials to The data is latched. The source driver of claim 1, further comprising: an output buffer coupled to the digital analog converter to generate a plurality of source driving signals according to the analog output signals. a driving circuit for driving a display panel, comprising: a timing controller for providing a compressed image signal; and a source driver for receiving the compressed image signal and having a decompression And converting the compressed image signal to a restored image data, and sequentially providing a plurality of source driving signals according to the plurality of display materials of the restored image data. The driving circuit of claim 19, wherein the timing controller receives an external image signal from the outside, the external image signal being over-compressed. The driving circuit of claim 19, wherein the timing controller comprises a compressor for compressing the external image signal to form the compressed image signal. The driving circuit of claim 21, wherein the timing controller further comprises a memory unit coupled between the compressor and the source driver for storing the compressed image signal. The driving circuit of claim 19, wherein the source driver further comprises a memory unit coupled between the timing controller and the decompressor for storing the compressed image signal. A display device includes: a display panel; a timing controller for receiving the external image signal to provide a compressed image signal; and a source driver for receiving the compressed image signal and having a decompressor And converting the compressed image signal to a restored image data, and providing a plurality of source driving signals according to the plurality of display materials of the restored image data to drive the display panel. The display device of claim 24, wherein the timing controller receives an external image signal from the outside, the external image signal being over-compressed. The display device of claim 25, further comprising a host, wherein the host compresses an image signal to provide the compressed external image signal. The display device of claim 24, wherein the timing controller comprises a compressor for compressing the external image signal to form the compressed image signal. The display device of claim 27, wherein the timing controller further comprises a memory unit coupled between the compressor and the source driver for storing the compressed image signal. The display device of claim 24, wherein the source driver further comprises a memory unit coupled between the timing controller and the decompressor for storing the compressed image signal.